Tuesday, 20 September 2016

Efficient Balancing Battery Management System

Efficient balancing battery management system: passive equalization is pure electric and hybrid in the most widely used in a balanced way, with low cost and high reliability. With the repeated charging and discharging of the battery pack due to inconsistencies between the internal resistance of the battery, the battery will generate pressure, if not treated, pressure will grow increasingly common industry practice is a parallel resistor voltage consumed high energy batteries. The traditional way of cooling and air resistance is the direct contact with the heat conduction out quickly difficult.




Efficient balancing battery management system is based on aluminum plate cooling technology and single-cell capacity equalization offset correction technology management system, this product can be efficiently accurate balanced management of lithium batteries. Traditional battery management system generally is about balancing the current 60mA, this product uses aluminum plate mount balancing resistor, while the aluminum plate by close fitting manner mounted on the aluminum shell, the heat generated by conduction out of balance, in order to achieve 200mA balanced current capability.

Traditional battery management system is mainly based on individual cell voltages were inconsistencies balance control, this product by estimating a single battery capacity combined with individual cell voltages real difference to identify a single battery capacity calculation error, thus equalizing the amount based on the difference control. Related products are more active equalizer low cost, high reliability, well-balanced effect and other advantages; similar to the more traditional passive balanced product costs, but has obvious effects can be balanced so that power battery charge and discharge energy and maximize lifespan.

The efficient equalization system has been applied to the whole country's new bulk power system BMS product that balancing capabilities far greater than the market similar products with stable quality, reliable. 200mA current balance is the industry's largest passive equalization current equilibrium rate is more than three times that of similar products, and balanced resistor can be fully opened. And similar products due to the heat is not good, balanced while only a handful of open points.



Battery management system hardware in the loop simulation: battery management system as the security level of quality and stability of auto parts, software, robustness is particularly important, traditional automotive electronic control system hardware in the loop simulation test system can not solve the high-voltage electric car, high current, high-precision real-time, special interface needs.

State new impetus developed battery management system hardware in the Loop Simulation Test Technology loop simulation technology is a real BMS controller plus the virtual object. With a high voltage power supply, high current constant current source, high-speed real-time processor, hardware I / O boards, Labview software, Matlab software and other components of the virtual object.

This article comes from http://www.storagebattery-factory.com/news/efficient-balancing-battery-management-system.html.

Ultra High Energy Density Lithium-ion Cylindrical Battery

High energy density, single battery energy density of 220Wh / kg or more, by cell materials and battery systems design solution enables high-energy quantization 18650 battery, including:

High specific capacity high nickel cobalt manganese lithium nickel or nickel-cobalt-aluminum material lithium cathode material and high specific capacity artificial graphite or silicon-carbon anode materials; and the development of adaptation with a high voltage for a silicon negative electrode and an electrolyte electrolyte materials, battery materials through system integration and optimization, to improve battery energy density and good cycle stability, improve the cost-effective use of 18650-type battery;


Reducing the thickness of the positive and negative current collector; to solve the battery safety problem by coating the negative type collector, reducing non-electrochemically active material while ensuring battery safety performance, taking into account the electrochemical performance and safety to meet the electric car the need to use;



Optimization of cell structure, reduce the amount of conductive agent and a binder, the amount of the membrane, reducing the mass and volume of the electrochemically active material of the battery Central Africa, to improve the energy density of the battery.

This article comes from http://www.storagebattery-factory.com/news/ultra-high-energy-density-lithium-ion-cylindrical-battery.html.

High Rate Fast Charge LifePo4 Storage Battery

By matching cell materials research, improved battery energy density, cycle, high temperature adaptability and rate charge and discharge performance; introducing a functional ceramic membrane structure and design optimization to improve the safety performance of the battery, especially anti-overcharge performance is greatly improved; compliance with the German VDA standard size, security compliance by IEC 62660-2 European standards, product adaptability, has a high market competitiveness, promote the use of the international market.



High rate fast charge LifePo4 ion battery: current domestic lithium-ion battery development and production has been very extensive, but now the battery cycle life, high rate discharge, Cold start so far to meet customer expectations .

To solve the lack of battery cycle life, low magnification charge and discharge efficiency and cold starting performance is poor technical problems, use hard carbon anode material with a lithium iron phosphate cathode material solutions. Graphene and nano-coated cathode material, a hard carbon graphite composite anode material, and structural optimization design, developed a high rate of low temperature LifePo4 ion battery (core technology).

The battery can be large current discharge 30C, 10C (10 minutes) fast charging, start-stop power supply suitable for automotive and other areas need to be high-rate charge and discharge (technological breakthroughs 1). At the same time the battery has excellent low temperature performance, -40 ℃ discharge efficiency of over 80%.

New soft carbon anode materials for lithium-ion batteries: lithium-ion batteries as a new energy industry, the core technology has been rapid development in recent years, but its application in the process also faces low cycle life, high production costs, poor high temperature performance technology puzzle, Shandong Viagra can solve these problems, the introduction of low cost, long life, excellent high temperature performance of soft carbon material as the negative electrode, developed a new type of silicon carbide having a negative electrode for lithium-ion batteries.

Product design process to study the process of closing the pulp slurry rheology, stability and dispersion characteristics and the technology to optimize and improve the quality of the pole pieces, put battery manufacturing consistency.



By optimizing the cell design to improve high current battery charge and discharge performance and low-temperature discharge performance. Battery 3C discharge capacity retention rate of over 95%, low temperature -40 ℃ discharge capacity retention rate of over 80% to match the battery material design. 

Improve the cycle performance of the battery, 80% DOD can charge and discharge cycles more than 6000 times. 

This article comes from http://www.storagebattery-factory.com/news/high-rate-fast-charge-lifePo4-storage-battery.html.

Monday, 19 September 2016

Three Reasons of Lithium-ion Battery of Fire or Explosion

One of the main power supply computers and other portable electronic products. However, lithium-ion battery charging and discharging process because of improper use can be dangerous and explosion; especially under abuse conditions (such as heat, overcharge, short circuit, vibration, compression, etc.), the battery will be a fire, explosion or even staff injuries and so on. Therefore, the study of the explosion mechanism of lithium-ion batteries to improve the safety of lithium-ion batteries has important significance.



Lithium-ion battery fire or explosion three possibilities, with the following three.

First, when the lithium-ion battery to heat, the reaction inside the battery, such as a chain reaction, each reaction and promote each other, in turn. First, the SEI film decomposition exothermic heating battery, prompting a negative reaction to the solvent release more heat, resulting in a negative reaction with a binder, and solvent decomposition, then followed by the positive terminal of a thermal decomposition reaction and emit a lot of heat and gas and finally cause the battery to fire or explosion.

Second, at the beginning of rechargeable lithium-ion battery, the battery current through a portion of the electrical energy into heat energy, ohmic polarization also generates some heat, but the battery surface temperature rise is very slow; when the battery reaches full charge, lithium ions continue embedding the reaction of lithium metal becomes deposited on the surface of the negative electrode, the solvent is oxidized (by the over-charging due to solvent exothermic heat of the oxidation reaction is much higher than the state of the lithium ion reversibly exothermic heat of reaction with the solvent) heated by the heat of the discharged battery; as the battery temperature increases, the reaction solvent and lithium metal, lithium is reacted with carbon solvent have occurred, thermal runaway, accompanied by the occurrence of decomposition of the solvent, the reaction with lithium metal binder.

Third, the harm short circuit, acupuncture and the impact caused by lithium-ion battery is approximately the same. When the short-circuit current generated by the instantaneous battery a lot of heat, heat the battery, the battery temperature rises to the decomposition temperature of the positive electrode, the cathode thermal decomposition and cause the battery thermal runaway; when acupuncture is fast, resulting in a partial puncture site short circuit and generates a lot of heat, the temperature inside the battery rises to the positive thermal decomposition temperature; when the lithium-ion battery by the impact, over-voltage electrode generating heat loss, prompting a negative reaction with the solvent, the heat released further heating battery to promote the positive thermal decomposition reaction occurred heat runaway.
One of the main power supply computers and other portable electronic products. However, lithium-ion battery charging and discharging process because of improper use can be dangerous and explosion; especially under abuse conditions (such as heat, overcharge, short circuit, vibration, compression, etc.), the battery will be a fire, explosion or even staff injuries and so on. Therefore, the study of the explosion mechanism of lithium-ion batteries to improve the safety of lithium-ion batteries has important significance.

This article comes from http://www.storagebattery-factory.com/news/three-reasons-of-lithium-ion-battery-of-fire-or-explosion.html.

Why Sotrage Battery Need BMS

Remote meter equipment due to its special working conditions and work requirements of the battery is very high. It requires the battery has a longer continuous power supply capacity, battery life time is often needed to reach a year or even longer.Because of the lithium batteries high voltage, small size, light weight, high energy density, no memory effect, no pollution, low self-discharge, long cycle life, the many advantages of being widely used in remote monitoring long standby instrument. Compared with nickel-metal hydride batteries, lithium-ion battery 30%-40% lighter, energy 60% higher than it. However, lithium also has serious flaws, is summarized in the following two aspects:



Safety

Lithium battery security is poor, when an explosion and other defects. Especially lithium cobalt oxide cathode materials for lithium batteries can not be high-current discharge, poor security. In addition, almost all kinds of lithium battery overcharge or over-discharge can cause irreversible damage. Lithium battery temperature is extremely sensitive: if used in high temperature conditions, may cause decomposition of the electrolyte, combustion or explosion; temperature is too low will lead to a marked deterioration in the performance of lithium batteries, affect the normal use of the equipment. Due to limitations in the battery production process, the internal resistance of each cell, there will be differences in the capacity etc. When a plurality of battery cells in series, will cause the rate of charging and discharging batteries various inconsistencies, which led to the utilization of the battery capacity is low. In view of this, the lithium battery in the actual use of the process often requires special protection system to monitor the health status of the battery, lithium batteries use to manage the process. Shows the decomposition of the electrolyte of the lithium battery.

Maintainability

Lithium battery capacity at low attenuation and power makes the device unable to accurately predict poor maintainability. A long line of instruments require periodic battery replacement, and remote monitoring equipment to work sites scattered on the road between the various remote sites, so the battery replacement huge workload and costly. In order to reduce the maintenance workload, reduce maintenance costs, it requires a battery management system with an accurate estimate of the state of charge function to accurately grasp the battery state of charge, battery replacement and more destinations; also need a battery management system with a lower its power consumption to reduce the frequency of maintenance and prolong battery life. Therefore, long-lasting power for remote monitoring instrument, the rational design of battery management system to maintain the device has a very important significance.

However, the working characteristics of remote monitoring instruments and inherent characteristics of lithium batteries make such an application developed to meet the requirements of the battery management system becomes very difficult. There are several factors: First, from the working characteristics of distance measuring instruments concerned, in order to reduce power consumption, remote measurement instruments typically carried out periodically sleep and wake, and its current work is dynamic, wake-up phase of the current much higher than hibernation, but the wake-up phase of the working time is far less than the dormant stage; secondly, lithium battery discharge curve is very flat, the main power concentrated in 3.6V voltage or more, and then, with further reduction in voltage, battery charge began a sharp decline, remote instrumentation can not be issued in accordance with the battery voltage is low battery alert; Finally, the lithium battery self-discharge rate changes with temperature fluctuated for work in the field of instrumentation, the temperature conditions are very extreme, and further increase the battery is difficult to predict. Existing battery management system is difficult to adapt to these functional and performance requirements, based on the background of the subject is proposed.

This article comes from http://www.storagebattery-factory.com/news/why-sotrage-battery-need-bms.html.

Function of Solar Energy Battery and How to Choose

The function of solar energy battery


The role of the solar energy storage battery module is to convert solar energy into electrical energy supplied to the load of work or to the lifePo4 battery pack; the role of the controller is a battery charge and discharge protection; lifePo4 battery for storing electrical energy; the role of the inverter is DC converted into alternating current. At night or rainy days, when the solar cell does not work, powered by a solar energy battery storage to the work load.

Solar energy battery work can be divided into two recycling and the use of float. Often in frequent charging and discharging state, that is recycled; often in a state of charge of the float was used to make up for the loss of battery capacity due to self-discharge caused. PV system with VRLA batteries are recycled in a manner.

Composed of photovoltaic systems, photovoltaic off-grid system is the use of the principle of the photoelectric effect to convert solar energy to electrical energy generation system, usually consisting of solar modules, controller,  storage battery, DC / AC inverter and other components.



How to choose solar energy battery


1, Selection on demand: according to their needs, and to calculate the amount of solar storage battery capacity needed.

2, Selection: For security principles, you should choose a certain brand of solar energy battery storage manufacturers, choose a good technology and services sales agents.

3, Cost-effective choice: Depending on the quality of products, some battery life is only 2 years, some battery life of up to 10 years, comparing the user to select the most suitable storage battery.

4, The solar storage battery capacity calculation: the battery capacity must be based on a predetermined voltage, the predetermined time can be provided to the load capacity. Batteries with deep discharge function, the unit of measurement of electricity generally ampere-hour (Ah), which indicates the unit of time (usually 20 hours) can provide a current value - (20 hours) rate capacity.

5, How to determine the capacity of the best batteries for solar power storage based on the use of lighting, the simplest way is to charge each battery power multiplied by time interval between. The outcome of the measurement of watt, except when the tile at their rated voltage, it is possible to convert a time when security watts. In this case selection, solar storage battery power will be exhausted, and over the general state of discharge of the battery is 50%, it should be taken into account to choose the battery. Battery capacity (Ah) larger power supply capacity, the stronger, the less likely the battery from over discharge.

High Efficiency Solar Energy Storage Battery Material

The latest study found that a group of very promising lead mixed halide perovskite materials, they can be recycled light particles. This new discovery opens the door to maximize the efficiency of the solar storage battery, it will lead to a new generation of affordable high-performance solar storage batteries reality.



Organic halides lead perovskite materials are made from organic and inorganic molecules forming an ordered self-assembly of organic - inorganic hybrid compound, with the ease of processing, and low cost, along with high electron mobility, photovoltaic and thermal stability etc., which makes the prospect of such materials has an important development in the application of low-cost solar energy battery storage.



Mixed Lead halide perovskite is a special synthetic material, having a revolutionary impact on the development of the solar energy battery storage, experts have carried out a lot of research, can once cheap and simple to manufacture this material, within a few years perovskite solar energy storage will work with current energy efficiency of solar cells is almost the same. About cycle of sunlight to optimize research perovskite is only a start, by absorbing solar photons of solar energy storage batteries after charging, this process, in turn, are also possible, because when the charge recombination, they can produce photons, this study shows a solar  having a perovskite resorption of these extra photons reproduction capability, i.e., photon recycling process. Capacity utilization cycle photons can be relatively easy to make solar cell breakthrough in energy efficiency limit of the battery storage for solar power.

These materials are not only the development of solar storage batteries, LED can also carry out research and development.

This article comes from http://www.storagebattery-factory.com/news/high-efficiency-solar-energy-storage-battery-material.html,