Why do lithium battery packs need to be managed in a balanced manner?

Lithium battery packs usually consist of one or several lithium battery packs in parallel, and each lithium battery pack is composed of 3 to 4 batteries in series. This combination can simultaneously meet the voltage and power requirements of notebook computers, medical equipment, detection instruments, and industrial use. The lithium battery pack BMS balance management system can effectively monitor, protect, energy balance and fault alarms on the lithium battery pack, thereby improving the working efficiency and service life of the entire power lithium-ion battery pack. The use of lithium battery equalization solution technology can handle SOC and C/E mismatch problems, thereby improving the performance of series-connected lithium battery packs. The battery mismatch problem can be corrected by balancing the battery during the initial adjustment process, and then only needs to be balanced during the charging process, while the CE mismatch has to be balanced during the charging and discharging processes. Although the defect rate of lithium battery manufacturers may be very low, we still need to provide further quality assurance in order to guard against the problem of battery life being too short. When using lithium battery packs, try to keep balance as much as possible, which is good for the safety of lithium batteries. Otherwise, there are individual abnormalities in many single lithium batteries or failures that are not controlled in time, causing failure, fire, explosion, etc., which will affect the entire lithium battery pack. Cause damage, cause malfunction. At present, common lithium battery pack equalization technologies mainly include energy-consuming passive equalization, charge equalization, and transfer active equalization. In terms of development difficulty, cost, equalization efficiency, and power utilization, passive equalization is the easiest to develop and has the lowest cost. , The balance current is very small, usually within 100 mA, the balance efficiency is low, and the power utilization rate is zero; the charging balance is relatively complicated, and the cost is increased a lot, the balance current can reach the ampere level, and the balance efficiency and power utilization rate are high; The type of active equalization is more complicated, the cost is relatively high, the maximum equalization current can reach more than a few amperes, and the equalization efficiency and power utilization rate are the highest. 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: Research on the heat dissipation of polymer lithium batteries