Solar Power Battery Storage System The Principle of Charging and Discharging

Solar Power Battery Storage System

Solar power battery has a high operating voltage, high energy density, a series of unique advantages of long cycle life, environmental protection and so on. And supports stepless extension. After the composition of the energy storage system for large-scale energy storage.

Solar storage batteries energy storage system consists of Solar power battery group, a battery management system (Battery Management System, BMS), commutation devices (rectifiers, inverters), central monitoring system, transformers and other components, as shown in FIG.

Solar power battery energy storage system of energy conversion principles. Charging stage, intermittent power supply or power grid as the energy storage system is charged, the AC to DC rectifier rectifier after charging the battery energy storage module to store energy; discharge phase, the energy storage system to the grid or the load is discharged, the battery energy storage module through the inverter DC to AC inverter, via the central monitoring system controls the inverter output, enabling the load to the grid or to provide a stable power output.

Battery charge and discharge principle

Charge-discharge reaction of Solar power battery is between solar power battery and FePO4 two phases. During charging, Solar power battery ions moving away from FePO4, during discharge, lithium ions FePO4 formed Solar power battery.

When charging the battery, lithium ions migrate from the solar power batteries crystals to the crystal surface, under the action of the electric force, into the electrolyte, and then through the membrane, and then the electrolyte migrate to the surface of the graphite crystal, then the character is embedded in graphite. At the same time, the flow of electrons through a conductor of positive electrode collector foil by tabs, battery positive column, the external circuit, the negative pole, the negative electrode lug flow battery cathode copper foil collector, and then flows through a conductor graphite anode so that the negative electrode Heda to balance. After the lithium ions from the Solar power battery deintercalation of Solar power battery is converted to iron phosphate.

When the battery is discharged, the lithium ion deintercalation from graphite crystals out into the electrolyte, and then through the membrane, through the electrolyte to migrate to the surface of Solar power battery crystals and then re-embedded into the crystal lattice of Solar power battery. At the same time, the flow of electrons through a conductor foil negative electrode collector by tabs, battery negative column, the external circuit, the positive pole, the cathode tabs flow battery cathode foil collector, and then flows through the conductive body iron phosphate lithium anode, the positive electric Heda to balance. Lithium-ion iron phosphate crystals embedded in the rear, into iron phosphate Solar power battery.

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