Introduction to BMS functions of lithium-ion batteries

1. Battery protection, similar to PCM, includes overcharging, over discharging, over temperature, over current, and short circuit protection.

2. Energy balance: The entire lithium-ion battery pack, due to the series connection of many batteries, after working for a certain period of time, will exhibit significant differences due to the inconsistency of its battery cells and working temperature, which will have a huge impact on the battery's lifespan and system utilization. Energy balance is to compensate for the differences between individual battery cells and perform active or passive charging or discharging management, Ensure the consistency of lithium-ion batteries and extend their lifespan.

3. SOC calculation, the calculation of the battery capacity of lithium-ion batteries is an important part of BMS, and many systems need to accurately understand the remaining battery capacity. Due to the development of technology, there are many methods for calculating SOC, and those with low accuracy requirements can determine the remaining power based on the battery voltage.

Overall, lithium-ion battery BMS is a hierarchical, graded, and unified management of individual batteries, battery packs, and battery stacks. Based on the characteristics of each level, it calculates and analyzes various parameters and operating status of batteries (individual cells, packs, and stacks), achieving effective management such as balance, alarm, and protection, ensuring equal output of each group of batteries, and ensuring that the system reaches the optimal operating state and longest operating time.

The above are the types of batteries and the functions of lithium-ion battery BMS. As a powerful guarantee for the safe use of batteries, the lithium-ion battery management system BMS ensures that the battery is always in a safe and controllable charging and discharging process, greatly improving the cycling service life of the battery in actual use.