Function analysis of lithium-ion battery protection board battery management system bms

1. Battery protection: over-charge, over-discharge, over-temperature, over-current, and short-circuit protection.

2. Balanced performance: A complete lithium-ion battery pack is composed of multiple lithium batteries in series and parallel, because the mismatch of the battery itself, inconsistent operating temperature and other factors will cause performance differences. An energy balance that has a great impact on the life and use of the battery pack is to adopt active or passive charging and discharging methods to reduce the difference between individual cells and ensure the consistency of the battery.

3. SOC remaining power calculation: technology is constantly evolving. There are many ways to calculate SOC. If the accuracy requirement is not high, the remaining power can be judged according to the battery voltage. Accurate calculation methods include current integration method (or Ah method), Q=idt, internal resistance method, neural network method, Kalman filter, etc.

4. Communication: Different systems have different requirements for communication interfaces. The main streams are SPI, I2C, CANBUS, RS485, etc. The energy storage system mainly includes CANBUS and RS485.