Does the lithium battery protection board have a balance function?

1. The situation where the balance cannot be used: Many people think that the battery pack has a balanced use in the middle and later stages of use. In fact, when the battery pack is used in the middle and later stages, due to the different capacity losses of each battery cell, a capacity difference is caused. , It is impossible to make up for the cell capacity by the equalization of the protection board. On the surface, the voltage of each string of the battery pack is the same, but due to the inconsistency of the capacity, the single string cell with low capacity is often the first over-discharge protection and Overcharge protection, so the capacity of the battery pack is also reflected in a single string of cells with low capacity. Therefore, we should understand that the protection board balances the voltage, and the capacity cannot be supplemented. 2. The contradiction in the use of balance: balance generally has two elements: A: balance opening voltage setting: the balance voltage setting is low, the protection board is turned on for a longer time, and the balance effect is relatively clear, but the protection board will be balanced while balancing. When heat occurs, the longer the equalization time, the more heat appears, which directly affects the performance of the protection board or the protection board is damaged; the equalization voltage setting is high, the equalization opening time is short, and the equalization effect is unclear. B: Equalization current setting: The equalization current setting is large, the equalization effect is clear, but the equalization is severe heat, which will damage the protection board; the equalization current setting is small, the equalization effect is unclear, and the equalization time is short. 3. It is necessary to bring balance: when the battery pack is processed and stored for a long time, due to the different static power consumption of each circuit of the protection board and the different self-discharge rate of each battery cell, the whole battery string is formed. The voltage is inconsistent, so there is a distinct pressure difference, but when the capacity is consistent, the equalization has the function of equalizing the voltage of the battery pack, so as to achieve the effect of full charge and full discharge of the battery pack capacity, so that the battery pack can play a large role . Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous: What are the requirements for the BMS function of large energy storage lithium batteries?