What are the manifestations of inconsistencies in lithium battery packs

1. Capacity loss. The battery cells form a lithium battery pack. The capacity is in accordance with the barrel principle. The capacity of the worst battery cell determines the capacity of the entire lithium battery pack. Take two batteries in series as an example. One battery has a capacity of C, and the other has a capacity of only 0.9C. In a series connection, two batteries pass the same amount of current. When charging, a battery with a small capacity must overflow first, and the charging cut-off condition is reached, and the system will no longer continue to charge. When discharging, a battery with a small capacity will inevitably emit all available energy first, and the system will stop discharging immediately. In this way, the batteries with small capacity are always overflowing, but the batteries with large capacity are always using part of the capacity, and part of the capacity of the entire lithium battery pack is always in an idle state. 2. Life loss is determined by the cell with the shortest life. Small-capacity batteries are overflowing every time, and the output is too strong, which is likely to reach the focus of life first. When the battery cell's life ends all the time, a group of battery cells welded together will die. 3. The internal resistance increases, the same current flows through different internal resistances, and the cells with large internal resistance generate more heat. The battery temperature is too high, causing the deterioration rate to accelerate, and the internal resistance will further increase. Internal resistance and temperature rise form a pair of negative feedback, which accelerates the deterioration of high internal resistance cells. Of course, the internal resistance of the battery with a deep aging degree is larger, and the capacity attenuation is also more. 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: Can lithium batteries completely replace lead-acid batteries?