What are the charging methods for energy storage lithium iron phosphate batteries?

The basic composition of the energy storage lithium iron phosphate battery pack The general charging module of the lithium iron phosphate battery pack is composed of a charging current sampling circuit, a charging switch tube, an integrated control circuit, and a charging voltage sampling circuit, as shown. The charging sampling circuit can set the constant charging current of the charging module according to the capacity of the lithium iron phosphate battery to be charged. Energy storage lithium iron phosphate battery pack charging method (1) Constant voltage charging method: During the charging process, the output voltage of the charging power supply remains constant. As the state of charge of the lithium iron phosphate battery pack changes, the charging current is automatically adjusted. If the specified voltage is constant, it can not only ensure the full charge of the power lithium-ion battery, but also minimize gassing and water loss. This charging method only considers the change in the single state of the battery voltage, and cannot effectively reflect the overall charging status of the battery. Its initial charging current is too large, which often causes damage to the power lithium-ion battery. In view of this shortcoming, constant voltage charging is rarely used. (2) Constant current charging method: During the entire charging process, the charging current is kept constant by adjusting the output voltage. Keep the charging current constant, the charging rate is relatively low. The constant current charging control method is simple, but because the acceptable current capacity of the lithium battery pack gradually decreases with the progress of the charging process, in the later stage of the charging, the power receiving capacity of the power lithium-ion battery decreases, and the charging current utilization rate is greatly reduced. The advantages of this method are simple, convenient, and easy to implement, and the charging power is easy to calculate. (3) Constant current and constant voltage charging method: This charging method is a simple combination of the above two. In the first stage, the constant current charging method is used to prevent excessive charging current at the beginning of the constant voltage charging. The second stage adopts the constant voltage charging method to prevent the phenomenon of overcharging during constant current charging. Lithium iron phosphate battery packs are the same as any other sealed rechargeable batteries. The charging must be controlled and overcharged, otherwise the battery will be easily damaged. Lithium iron phosphate batteries generally adopt a charging method of constant current first and then voltage limiting. (4) Chopping wave charging method: Use the chopping method to charge. In this method, the current of the constant current source is unchanged, and the switch tube is controlled to turn on for a period of time and then turn off for a period of time, cyclically. The advantage of this method is that when the battery is charged through an external circuit, The presence of ions inside the battery requires a certain response time. If it is continuously charged, its capacity potential may be reduced. After charging for a period of time, adding a turn-off time can allow the ions appearing at the two poles of the battery to have a diffusion process, giving the battery a time for digestion, which will greatly increase the utilization rate of the battery and improve the charging. effect. Disclaimer: Some pictures and content of the articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous: Why is the UPS battery in the computer room damaged?