Saturday, 17 September 2016

Lithium-ion Battery VS LifePo4 Solar Energy Battery Storage

LifePo4 solar energy battery storage, refers to as a cathode material for LifePo4 batteries. Lithium-ion battery cathode material of lithium cobalt oxide, lithium manganese, nickel, lithium, ternary materials, lifePo4. Wherein the lithium cobalt oxide cathode material is currently used in the vast majority of lithium ion batteries.

LifePo4 Solar Energy Battery Storage Eight Advantages

lifePo4 crystals of P-O bond firm, difficult to decompose, even at high temperature or overcharge will not be as lithium cobalt oxide as the structure collapses fever or strong oxidizing substances, it has a good safety profile. There are reports that practice acupuncture or short experiment, we found a small part of the sample combustion phenomenon occurs, but there was one case of bombing, and overcharge used in the experiment far beyond the self-discharge voltage of high voltage charging several times and found that there are still explosions. Nevertheless, the overcharge security than ordinary liquid electrolyte lithium cobalt oxide batteries, has been greatly improved.

Improve life

LifePo4 refers to the use of lifePo4 as the cathode material for solar energy battery storage.

Long-life lead-acid battery cycle life of about 300, the maximum is 500, while the lifePo4 solar storage battery , the cycle life of more than 2000 times the standard charge (5 hour rate) used up to 2000 times. With the quality of lead-acid batteries is the "new six months, six months old, Maintenance and six months", most will be from 1 to 1.5 years, while the lifePo4 used under the same conditions, the theoretical life expectancy will reach 7 to 8 years. Taken together, the cost performance is theoretically more than four times the lead-acid batteries. High-current discharge high current 2C fast charge and discharge, under the dedicated charger, 1.5C charge you can make in 40 minutes the battery is full, the starting current of up to 2C, but no such performance lead-acid batteries.

Good high temperature performance

lifePo4 peak heating up to 350 ℃ -500 ℃ and lithium manganese oxide and lithium cobalt only about 200 ℃. Wide operating temperature range (-20C - + 75C), there is high temperature characteristics of lifePo4 peak heating up to 350 ℃ -500 ℃ and lithium manganese oxide and lithium cobalt only about 200 ℃.

High capacity

The ordinary batteries (lead-acid) greater capacity. 5AH-1000AH (monomer)

No memory effect

Rechargeable solar energy storage batteries in full condition after letting go often in work, the capacity will be lower than the nominal capacity value rapidly, a phenomenon called memory effect. Such as nickel metal hydride and nickel cadmium batteries exist memory, lifePo4 is no memory effect, no matter what state the battery can recharge it with no need to recharge is done.

Light weight

The volume of the same specifications capacity lifePo4 solar energy storage batteries is the volume of lead-acid batteries 2/3, 1/3 weight of lead-acid batteries.

Environmental protection

The solar energy storage batteries are generally considered to be free of any heavy metals and rare metals (nickel-metal hydride batteries to be rare), non-toxic (SGS certification through), non-polluting, in line with European RoHS regulations as an absolute battery green card. So the reason to be optimistic about the lithium battery industry, mainly environmental considerations, so the battery and included in the "863" national high-tech development plan "fifth" period, becoming the state's key projects to support and encourage development. Chinese exports of electric bicycles will increase rapidly, and enter the European electric bikes have been with the requirements of non-polluting batteries.

But some experts said the environmental pollution caused by lead-acid batteries, mainly in the business of non-standard production processes and recycling sectors. Similarly, lithium batteries are the new energy industry is good, but it can not avoid the problem of heavy metal pollution. Metal materials processing lead, arsenic, cadmium, mercury, chromium, etc. are likely to be released into the dust and water. The battery itself is a chemical substance, it is possible to produce two kinds of pollution: the production engineering process fecal contamination; the second is scrapped after battery pollution.

lifePo4 has its drawbacks: such as poor low temperature performance, small cathode material tap density and volume capacity of lifePo4 is greater than the lithium cobalt oxide lithium-ion solar battery storage, and therefore does not have the advantage in miniature solar battery storage. And when used in motive power batteries, lifePo4 batteries and other batteries, battery consistency need to face the problem.

Comparison of battery

The most promising are used in power lithium-ion solar battery storage cathode materials are modified lithium manganese oxide (LiMn2O4), lifePo4 (LiFePO4) and nickel cobalt manganese lithium (Li (Ni, Co, Mn) O2) three yuan material. Nickel, cobalt and manganese lithium cobalt ternary material due to a lack of resources and nickel, and cobalt into high price volatility and other factors, generally considered difficult to become electric vehicle power lithium-ion battery of the mainstream, but with manganese spinel lithium mixed within a certain range.

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Dehydration Problem Lithium Battery Cathode Material LifePo4

Dehydration is a lithium-ion battery materials eternal topic, both positive and negative material production, or electrode production process have to face the problem of dehydration. FePO4 precursor material is both LiFePO4 material, but also can be used alone as the positive electrode material, so the problem of dehydration FePO4 material that we can not avoid the problem.

Generally iron phosphate dehydration process is divided into two parts: the first one, mainly to take off some of the material in the free water which is very easy to remove, the temperature is lower.

Second, the crystallization of the material off the water, the water molecules with the iron phosphate materials chemically combined manner, it requires a higher activation energy - that is, higher temperatures, complete removal of the water to this part, but the study reaction kinetics of the process is not a lot.

Preparation of iron phosphate commonly used ferric sulfate or other soluble ferric iron source, phosphoric acid or phosphate as the phosphorus source, NaOH as PH regulator, by co-precipitation methods.

Actual production is generally controlled between 1.6-2.0 PH, PH is too high when it may precipitate Fe (OH) 3 impurities, and PH value is too low will cause the precipitation of Fe3 + incomplete. The precipitate is filtered and washed after high temperature sintering is required, this process is mainly for two purposes, first off FePO4˙2H20 material in the water, and secondly to make FePO4 crystal material fully developed, in order to ensure a complete crystalline material type.

TG was found in the range of 50-223 ℃, FePO4˙2H20 material appeared in 20.23% of weight loss, which is mainly FePO4˙2H20 material two crystal water is removed, and then as the temperature rises, FePO4 material does not continue to appear weightless, so the dehydration process is mainly done in this process.

In 736 ℃ appeared an exothermic peak, and there was no loss of quality, which indicates that at this temperature, the material FePO4 crystalline transition occurs subsequent XRD diffraction analysis also found that, at 700 ℃ under synthetic material FePO4 diffraction peak is wide, part of the characteristic peak does not appear, at this temperature synthetic crystalline material FePO4 incomplete development of poor crystallinity.

The temperature was raised to 800 ℃, all characteristic peaks were appeared, but the characteristic peak intensity is still low, wide, indicating at the same temperature, crystal growth is still not complete, when the firing temperature is raised to 900 ℃, can pay attention to this time appears not only all the peaks, a characteristic peak of hexagonal (206) / (302) has also been completely separated, indicating FePO4 crystalline material well-developed.

At 900 ℃, FePO4 prepared material belonging to the hexagonal lattice parameters a = 0.50330nm, b = 0.50330nm, c = 1.12470nm, having α- quartz structure which is conducive to the lithium ion material embedded into FePO4 .

Kinetic studies on the dehydration FePO4 not much, FePO4 material dehydration mechanism and kinetics study has important implications for the development of the production process iron phosphate material.

The use of TG-DTG-DTA thermal analysis to study the mechanism and kinetics of dehydration FePO4˙4H20 materials, the study found FePO4˙4H20 material at 200 ℃, there were two DTG DTA exothermic peak and peak rate of weight loss, dehydration process is a two-step reaction, calculations show that the reaction is a D4-Fn-step reaction in which the activation energy of the reaction is D4 79.62KJ / mol, activation energy of the reaction Fn 103.04KJ / mol.

The study found no effect on the heating rate in the dehydration reaction mass, so long as the heating temperature reaches the appropriate temperature can be sufficiently removed FePO4 water. This has important implications for the sintering process of iron phosphate.

New Features and A of Solar Energy Batteries

The battery is a device that convert chemical energy directly into electrical energy. The solar battery storage are designed for a rechargeable battery, through a chemical reaction reversible achieve recharging usually refers to the lead-acid battery, which is a cell belonging to two secondary battery. It works: when charging using an external electric energy regenerated inside active material, the energy is stored as chemical energy, when you need to discharge to convert chemical energy into electrical energy output. This "solar energy batteries" means specially designed for solar power generation system storage batteries.

Solar Energy Battery Storage Have Following Characteristics:

  • Solar energy battery storage typically lead-acid battery is maintenance-free;
  • The solar energy battery storage are usually added to other ingredients (such as sodium) in the conventional gel battery electrolyte;
  • The solar energy battery storage on the charging voltage and temperature to adapt to a wider range.

Solar energy batteries (maintenance-free valve-regulated lead-acid batteries) Introduction:

Solar energy battery storage, also known as maintenance-free valve regulated lead acid batteries, is dedicated to the development and production of solar power systems, having the following advantages:
  1. Good safety performance: no electrolyte leakage under normal use, no cell expansion and rupture;
  2. Good discharge performance: stable discharge voltage, discharge platform gently;
  3. Good resistance to shock: fully charged solar energy battery storage completely fixed to 4mm amplitude, frequency 16.7HZ vibration 1 hour, no leakage, no cell expansion and cracking, open circuit voltage is normal;
  4. Good impact resistance: the battery is fully charged state 20CM height from naturally fall to the 1CM thick hardwood board 3 times no leakage, no cell expansion and cracking, open circuit voltage is normal;
  5. Resistance to over-discharge: 25 degrees Celsius, the solar energy battery storage is fully charged state of constant resistance discharge 3 weeks (resistance is equivalent to the battery discharge requirements 1CA resistance), to restore the capacity of more than 75%;
  6. Good resistance to charge: 25 degrees Celsius, fully charged battery 0.1CA charge for 48 hours, no leakage, no cell expansion and cracking, open circuit voltage is normal, the capacity retention rate of over 95%;
  7. Good resistance to high current: fully charged battery 2CA discharge for 5 minutes or 10CA discharge for 5 seconds. No conductive part of the fuse, without the appearance of deformation.

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Tuesday, 13 September 2016

Grid-Scale Battery Storage Go In Australia

Leading Australian economist and energy policy advisor Ross Garnaut has called for the adoption of grid-scale battery storage on Australia’s National Electricity Market, which he says would provide an “immediate” solution to integrating increasing amounts of grid-connected wind and solar and preventing future electricity price spikes.

In an opinion piece published in the Australian Financial Review on Wednesday, Garnaut – who currently chairs integrated community renewables and storage provider ZEN Energy, as well as the recently launched IIG Solar Fund – said the recent South Australian “energy crisis” had highlighted the need for urgent energy market reforms.

In particular, he said, a solution was needed to stabilise the short-term variations in supply frequency and price.

“An immediate answer is grid-scale batteries, which are being deployed in other developed countries to balance increasing volumes of wind and solar energy,” Garnaut wrote.

Batteries can respond to the need to add or absorb power in less than a second – much more quickly than gas generators,” he said.

“If optimised to maximise value in provision of grid stability services, the battery can store surplus power from excess generation from the midday sun or overnight wind for use in the evening and morning peaks at total costs that are lower than the prices of wholesale hedge contracts, or than exposure to the wholesale market at these times.

Garnet also said that the application of grid-scale solar and battery storage solutions could be of particular benefit to major industrials, to lower total costs of power.

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Sonnen Electricity Storage Operation In L.A.

Los Angeles billionaire Elon Musk is driving development of more than just electric cars: The head of Tesla Motors Inc. often grabs headlines with his company’s Powerwall battery, designed to let homeowners stash electricity from their solar panels for later use.

But a North Hollywood operation has been quietly beating Musk and Tesla when it comes to selling residential electricity storage batteries.

Sonnen Inc., which emerged on the world stage half a dozen years ago in Bavaria, Germany, has sold 13,000 residential storage batteries worldwide at a current pace of about 900 a month. U.S. sales, managed out of the Sonnen’s American headquarters in North Hollywood, account for about a quarter of the monthly tally.

Tesla is still ramping up Powerwall production but delivered 2,500 Powerwall systems worldwide in the first three months of the year, according to a May shareholder letter. Sonnen sold 2,600 residential batteries during the same period, a company record.  

“Elon Musk has the name,” said Boris von Bormann, chief executive of Sonnen Inc. He didn’t bother to stifle a grin as he added: “Yes, we are the leader.”

With little fanfare, Sonnen rolled out its U.S. operations less than a year ago and opened the Southern California office in January. The company already has expanded its offerings to include commercial electricity storage, which should be ready for delivery by the end of the year.

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AGL Installs Solar Batteries

ENERGY giant AGL will install solar batteries on 1000 homes across Adelaide, building a ‘virtual power plant’ to provide back-up electricity to householders and the state’s energy grid during times of high energy demand.

In what is expected to be the largest project of its kind in the world, the batteries will store excess solar power that would otherwise be fed into the grid and will be able to be drawn upon by the customer, reducing their power costs and demand on the grid.

AGL will also have the ability to direct power from the battery to the customer’s home or into the grid during critical events such as peak demand resulting from severe weather.

Any solar energy exported to the grid will occur at the agreed retail feed in tariff.

The system will generate a peak capacity of 5MW, or, according to AGL figures, the equivalent of the average annual power consumption of one home.

The first of the 7.7kW batteries, to be subsidised through AGL and the federal Australian Renewable Energy Agency, are expected to be installed later this year at a cost of $3500 to existing AGL solar customers.

AGL anticipates a payback of approximately seven years to customers who purchase batteries as part of the project.

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Monday, 12 September 2016

Solid-State Batteries For Grid

The solid-state batteries that are on the market today are thin-film batteries, which, on account of their limited capacity, can only be used for micro-storage, for example to provide power for sensors. But as a result of innovations in materials and architecture, solid-state batteries may soon be used also for large storage systems, for example for electric cars or the smart grid. 

The development of solid-state electrolytes with high Li-ion conductivity is an important link in achieving that aim. At imec, a nano-composite electrolyte has been developed which can bring solid-state batteries one step closer to the market.

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Around The World With Zero Fuel

The first aircraft powered solely by the sun made a historic landing in Abu Dhabi on Tuesday, completing the 25,000 mile, round-the-world journey that began in March 2015.

The Swiss-engineered Solar Impulse 2 was piloted by Bertrand Piccard on the final part of its epic expedition that took off from Cairo earlier this week. The last stop completes its 17-leg, milestone journey using only the power of the sun's rays.

The lightweight aircraft, which weighs the same as an SUV but has the wingspan of a Boeing 747, is the brainchild of Piccard and Bertrand Borschberg, a Swiss engineer and businessman. The aircraft is a single-seater, so the two men have shared the flying by taking different legs of the journey.

"What I'd like to show with my team is that clean technology today is showing incredible goals. You can fly now longer without fuel than with fuel, and you fly with the force of nature, you fly with the sun. It's the new era now for energy and this is really what we'd like to inspire people to do," Piccard said.

Solar Impulse 2 demonstrates the exploration of energy efficient batteries and clean technology that could potentially alter the way we travel.

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Solar Batteries Performance Enhancing Vitamins

Harvard University researchers reckon they can make flow batteries cheaper using an electrolyte based on vitamin B2.

Flow batteries function much like lead-acid batteries, with a fluid that reacts with electrodes to store charge. However, the liquid is cycled through an external tank in the charge/discharge cycle.

The external “refresh” of a flow battery's fluid means it can handle very deep discharges, while lead acid batteries have to be kept above 50 per cent charge. For a static application like storage from solar power, that makes flow batteries an attractive third alternative to both lead acid and lithium batteries.

Harvard's research is on improving the electrolyte, so the external tanks can store more energy per unit of volume, and that's where the vitamin B2 molecule comes in.

The university had previously worked on naturally-occurring quinones in the electrolyte; B2 is similar, they say, but uses nitrogen as the electron carrier. The important molecule in B2 is alloxazine, which forms the backbone of how the vitamin stores energy in human bodies.

The solution the researchers produced achieved “open-circuit voltage approaching 1.2 V and current efficiency and capacity retention exceeding 99.7% and 99.98% per cycle”, they write in their paper at Nature Energy.

Since the vitamin is already produced at an industrial scale, the researchers reckon the electrolyte can similarly be manufactured at large scale, and at very low cost.

LG Chem Unveils New Battery Storage

LG Chem, the South Korean company with the biggest share of the grid-connected battery storage market in Australia, has released its new generation systems, promising they will offer more choice, and be cheaper, smaller, lighter, and with improved aesthetics.

LG Chem, which claims nearly half of the nascent but rapidly growing Australian grid-connected market, is offering low voltage and high voltage options to Australian households, with its new battery storage systems ranging from a stackable 3.3kWh lithium-ion system to a 9.8kWh system.

The three low-voltage battery systems (48 volt) are being offered in 3.3kWh, 6.5kWh and 9.9kWh units, while 7kWh and 9.8kWh high voltage (400 volt) battery systems are also being offered.

The new series of battery storage systems will be offered globally but will be launched in Australia first as it remains the most attractive market for battery storage because of its high electricity prices, tariff structure, high levels of rooftop solar (now at 5GW) and excellent sunshine.

Changhwan Choi, Australian Business Development Manager at LG Chem, says there is a massive opportunity in the Australian market, particularly with the ending of the premium feed-in tariffs in some states at the end of the year.

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Solar City Keys On Battery Storage

Elon Musk’s plan for Tesla Motors Inc. to acquire SolarCity Corp. hinges on a symbiosis that doesn’t exist. At least not yet.

The key to the proposed $2.86 billion takeover is combining Tesla’s electric cars and wall-mounted battery units with SolarCity’s rooftop panels, letting homeowners store solar power to use at night. Here’s the catch: Creating this end-to-end energy company would negate the main financial incentive for rooftop panels.

Utilities let consumers sell power into the grid at rates generous enough to cover most or all of their utility bills. That benefit, known as net metering, loses its value when electricity is instead squirreled away in a Tesla battery. Musk has said the combination will make economic sense within five years.

“The value proposition for solar plus storage is at odds with net metering,’’ said Ravi Manghani, director of energy storage at GTM Research.

Tesla announced the friendly offer to acquire SolarCity June 21, and the solar company’s board is considering the deal. The two companies are closely linked, and Musk is their top shareholder, holding more than 20 percent of the shares in both. He’s planning to disclose the “Top Secret Tesla Masterplan Part 2,” possibly this week, according to a July 10 Tweet.

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The World's Largest Storage Battery

By 2021, electricity use in the west Los Angeles area may be in for a climate change-fighting evolution.

For many years, the tradition has been that on midsummer afternoons, engineers will turn on what they call a “peaker,” a natural gas-burning power plant In Long Beach. It is needed to help the area’s other power plants meet the day’s peak electricity consumption. Thus, as air conditioners max out and people arriving home from work turn on their televisions and other appliances, the juice will be there.

Five years from now, if current plans work out, the “peaker” will be gone, replaced by the world’s largest storage battery, capable of holding and delivering over 100 megawatts of power an hour for four hours. The customary afternoon peak will still be there, but the battery will be able to handle it without the need for more fossil fuels. It will have spent the morning charging up with cheap solar power that might have otherwise been wasted.
Early the next morning, the battery will be ready for a second peak that happens when people want hot water and, again, turn on their appliances. It has spent the night sucking up cheap power, most of it from wind turbines.

The politics for this to happen are now in place because California’s Public Utilities Commission set a target requiring utilities to build their capacity to store energy, to use more renewable energy and to cut the state’s greenhouse gas emissions 80 percent by 2050. The economics are there, too, because the local utility, Southern California Edison Co., picked the designer of the battery, AES Corp., an Arlington, Va., company, against 1,800 other offers to replace the peaker.

It was the first time an energy storage device had won a competition against a conventional power plant.

And the technology seems mature. AES has spent nine years working with manufacturers of electric-car batteries. It has learned how to assemble and control ever-bigger constellations of these lithium-ion batteries. The Long Beach facility, when it is completed, will have 18,000 battery modules, each the size of the power plant of the Nissan Leaf.

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Friday, 9 September 2016

Rockhampton Man Leads Solar Technology Charge

Eager to cut back on his quarterly $1700 bill, the Millroy St resident is now leading the pack as the first in Rockhampton to have installed and registered the Tesla Powerwall home battery - designed by the entrepreneurs behind Tesla vehicles and privately owned satellite launch company Space-X, which works for NASA.

Solahart manager and design engineer Grant Bond installed the system about one month ago, and explained the system was a "scaled down" version of the batteries used in Tesla's solar-powered cars, and worked with solar panels to potentially cut back your usage from the grid to zero.

"In essence the solar panels produce power through the day, that power initially is going into Peter's house so any power he is using during the day he is using through the solar panels," Grant explained.

"And any leftover is then going into the battery, charging the battery, and then in the afternoon and evening he is drawing power back out of the battery."

Peter explained he invested in the technology after he took a voluntary redundancy last year from BMA's Blackwater mine on the advice of his accountant, and said while he now works one week on, one week off at Yarrabee, there was still plenty of power being used in his two-storey home.

"I live with my wife and two teenage children, so we use the air-conditioning, the stereo, fridges a lot."

Peter is still awaiting his first bill, but said he would be happy to install another battery if needed as the way he views it, they will eventually pay for themselves.

"Our current bill, I think it's about $1,700, so even if we reduce it, that's going to be a benefit.

Since the system was installed it has already dramatically reduced Peter's usage from the grid from an average of 30-40kw to 8kw.

Grant said a good, hybrid system would set you back about $10,000 on top of the cost of your solar panels.

He said Tesla was taking huge strides in sustainable energy, and he believed within the next five to ten years batteries would become standard to homes.

"The world's heading that way, we are following as what they are doing in the western world which is basically becoming more self-sufficient in your power use," he said.

"Generate it on your roof, store it in the batteries and use it yourself and that's where the world is heading, and the governments have recognised that that's what's going on as well."

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The Tesla And Solar City Merger

Elon Musk, CEO of Tesla [NASDAQ:TSLA], plans to buy his cousin’s company, Solar City [NASDAQ:SCTY]. That has generated a lot of head-scratching in financial circles about how it will work out. Some facts commonly cited: Tesla is the most successful and biggest electric car company the world has ever seen. Solar City is America’s biggest residential solar company. Both companies lose money. Both are deeply dependent on billions of dollars in taxpayer subsidies, and both are at the epicenter of dreams to ‘green’ the highways and the grid.

Strip away debate about operational synergies and the sustainability of subsidies and you find a single technological article-of-faith animating believers in the companies’ conjoined vision: the idea that fantastically better batteries are in the imminent future. The battery pack is by far the most expensive component in a Tesla. In a conventional car, there is no equivalent component so expensive and dominant. Fantastically better batteries are key to a future in which electric vehicles (EVs) can make a serious dent in displacing oil in transportation systems.

Similarly, the utopian vision of distributed rooftop solar is fundamentally dependent on the belief that fantastically better and cheaper batteries will soon be available to do the obvious: keep the lights, TVs and PCs lit when the sun goes down in order to dispense with the ‘old’ utility grid wherein 70 percent of the electrons derive from burning shale gas and coal. Batteries — far better than anything that exists today — are vital if rooftop solar is to make a serious dent in displacing hydrocarbons and grids used in today’s electrical systems.

Thursday, 8 September 2016

Residential Battery Storage Not Yet

Australian homeowners may be flocking to energy storage in droves. But one of the country’s biggest engineering consultancies doesn’t see the financial sense in it.

Victoria-based Aurecon, which has operations across Africa, Asia, Australasia and the Middle East, and which has been associated with major renewable energy projects such as the Kogan Creek Solar Boost plant, says the financial impact of adding batteries to residential PV is “negative."

“Aurecon has modeled multiple scenarios with a Tesla Powerwall lithium-ion battery coupled with a 4-kilowatt rooftop PV system,” said Victor Young, the company’s market director for energy, oil and gas. “Adding batteries increases the cost of power even in the most favorable circumstance of a zero feed-in tariff from the network provider.”

As it happens, the Powerwall might not be the best battery on the Australian market, on a cost per total warranted kilowatt-hours basis. That honor currently goes to the Redflow ZCell zinc-bromide residential flow battery, according to SolarQuotes.

However, said Young: “The advertised higher cost of current-generation flow batteries does not encourage us to expect that the return on investment for this type of battery would be better.”

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LiFePo4 Batteries Will Enhance Energy Density

Recently, new energy vehicle power battery materials Summit held in Hefei, Huazhong University of Science and Technology [microblogging] Dean of Materials Science and Engineering, made a speech and said that Huang Yunhui, lithium iron phosphate and lithium-rich nanotechnology and application of technical and other means which will greatly enhance the practical energy density, lithium iron phosphate and implementation costs 2 yuan / watts no problem. Undoubtedly, this view if provoked uproar uniform gathered people in the industry's attention.

Huang Yunhui keynote address at the forum, said, currently made of lifePo4 batteries is about 100Wh / kg. Now to develop reach 250,260Wh / kg the next generation, the next step it will have an energy density of more than 300Wh / kg. To achieve such high specific energy of lithium iron phosphate batteries, on the one hand to consider the issue from the material itself, on the other hand, should be considered from the technical preparation of the battery.

Materials Science and Materials Engineering Dean Huazhong University of Science Huang Yunhui, said lithium iron phosphate lithium enriched by nanotechnology and other means and technical applications, which will greatly enhance the practical energy density, lithium iron phosphate and implement two yuan / watt the following costs when there is no problem.

Huang Yunhui said lifePo4 batteries system is currently made about 100Wh / kg. Now we want to develop reach 250,260Wh / kg the next generation, the next step it will have an energy density of more than 300Wh / kg. To achieve such high specific energy of lithium iron phosphate batteries, on the one hand to consider the issue from the material itself, on the other hand, should be considered from the technical preparation of the battery.

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Power Battery Safety: PACK and BMS Is Sticking Point

Benefit from the domestic policies of new energy vehicles and power lifePo4 batteries industry's strong support, in 2015 the new energy automobile production and sales surge, battery power shortage, dividend policy to benefit the whole industry chain. Industry insiders estimate that 2016 will usher in the first year of battery development. Battery long-term trend is no doubt, but safety is the primary criterion for consumer choice of products. Recently the Ministry of Industry "halt" Three lithium battery, a series of pure electric VW Golf 5561 due to "battery management system problems," recalls other incidents occurred, once again sparked public concern about the safety performance of the battery.

For the safety of the battery, in addition to battery materials technology road dispute, the industry generally believe that the role PACK battery and BMS in safeguarding security irreplaceable. Power Battery PACK product consists of three parts, namely the battery pack, BMS and holder shell (covering thermal management, structural design, high pressure control, security management, etc.). Wherein, BMS is known as electric vehicle power battery system "brain", and motive power batteries, vehicle control system together constitute the three core technology of electric vehicles.

No battery management battery pack is a bomb. BMS, ie, the battery management system is the core power battery pack, balanced load power, service life, safety, etc., are required BMS to control and optimization in the new energy automotive industry chain, industry value BMS is very important. Public information, BMS prevent over charge, avoid over discharge, temperature control and maintain the battery pack voltage and temperature balance, remaining battery capacity and predict the remaining mileage and other features. Meanwhile, BMS also has real-time monitoring and adjustment of the battery state management capacity, ability to work synchronized with a plurality of parallel subsystems. Through BMS can accurately measure the condition of the battery pack for solar powered portable generator, the battery will not overcharge and discharge protection, balancing a battery pack each battery charge, as well as analysis and calculation The battery pack and convert endurance understandable information to ensure battery safe operation.

The power of storage battery pack and battery management system was listed as key research tasks, "BMS charging infrastructure protection needs for the response rate of 100%" is listed as one of the operational safety ,and technical aspects of interconnection of electric vehicle infrastructure assessment indicators. Although BMS is very important for electric cars, but because of the relatively low proportion of the cost of the vehicle, the vehicle for a long time without the attention of enterprises, the lack of design and production experience,portable solar power generator  product BMS should do fine and stronger domestic business journey in the field of power battery BMS is still a long way to go, but because of the sudden outbreak of new energy automobile production and sales, the rapid expansion of downstream applications market is not growing enough to BMS industry time.Until 2020 years, the market of vehicle battery power will reach 120 billion yuan. Wherein, BMS system used by passenger cars account for about 10% -16%, commercial vehicles accounted for about 3% -5%, when the domestic electric vehicle market will reach 17 billion yuan BMS.

Solar Car Far Away From Us ?

How Solar Car Work?

Solar vehicle is solar energy into electricity to drive the car.The whole car like a big portable solar power generator. GaAs thin film solar battery technology conversion rate of 31.6%, this is the world's highest level, which also made a solar car provided technical backing. Gallium arsenide thin film solar cell technology will continue to improve the conversion rate. According to reports, in good sunlight conditions where annual solar energy can reach tens of thousands of kilometers; and in poor sunlight conditions where the amount of sun throughout the year to be driven about 20,000 kilometers.

Sun a Few Hours Is Enough?

Solar car appeared to be mainly rely on natural sunlight to provide energy, if a sunny day, don't worry about lack of energy. In SolarA computing models, vehicle weight of 1.2 tons and a maximum of 7.5 m2 body surface area stretched after laying; sunny day in the light for 5-6 hours, can generate approximately 8-10 degrees.

No Sunshine How To Work?

When solar power is insufficient, you can still take advantage of charging pile charged. In addition, under conditions of sunshine, the solar car will side with while charging by storage lifePo4 batteries pack, continue to add capacity, increase mileage, maximum mileage up to 350 kilometers, an increase of 10% -15% higher than conventional electric vehicles.

Intelligent management system relies on large data analysis and calculation - "Solar radiation cloud computing" to provide information. In such a "cloud computing", supported by mobile phones and dashboard will inform the user how many days in charge, in addition to the vehicle can be obtained in the course of its own energy through solar energy generator, so if there is no rain for a long time, in theory, can not enable legacy electric vehicle charging.

You Can Buy in Three Years?

Electric cars many years ago as a "future technology", to be honest, it can not be considered to achieve the degree of popularity. Easy of use, safety of the vehicle, are the focus of consumer concerns. At more realistic plug-in hybrid car was started, solar car looks more distant, more like the next achievable "sci-fi future" because of the cost of solar cars from the perspective of consumers and positioning considerations, the first solar car price is not low.

In addition, with the increasingly widespread application of portable solar power generator storage technology, not just the car, from the satellite has been applied to the spacecraft altitude long-endurance unmanned aerial vehicles, as well as common clothing, backpacks, electronics, and mobile devices such as the need for local power as long as there is sun shadow Hina, the mass production and use of such thin-film solar chip assembly will also have to reduce costs.

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