-(2)Working principle of BMS lithium-ion battery protection board and analysis of BMS lithium-ion battery protection function

(2)Working principle of BMS lithium-ion battery protection board and analysis of BMS lithium-ion battery protection function
author:enerbyte source:本站 click215 Release date: 2023-09-19 10:06:55
abstract:
Introduction to BMS lithium-ion battery protection functions: 1. Battery protection, similar to PCM, includes over charging, over discharging, over temperature, over current, and short circuit protection. 2. Energy balance: The entire lithium-ion battery p...

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Introduction to BMS lithium-ion battery protection functions:

1. Battery protection, similar to PCM, includes over charging, 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, will show significant differences due to the inconsistency of its battery cells and operating temperature after working for a certain time, which has a huge impact on the battery life and system usage. Energy balance is to compensate for the differences between individual battery cells and perform some active or passive charging or discharging management, Ensure battery consistency and extend battery life.

3. SOC calculation, due to the development of technology, there are many methods accumulated for SOC calculation. If the accuracy requirement is not high, the remaining electricity can be determined based on the battery voltage. The important accurate methods are the current integration method (also known as Ah method), Q=idt, as well as internal resistance method, neural network method, Kalman filtering method, etc.

4. Communication, different systems have different requirements for communication interfaces, with mainstream communication interfaces such as SPI, I2C, CAN, RS485, etc. Among them, CAN and RS485 are important for automobiles and energy storage systems.

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