Analysis of BMS lithium-ion battery protection function

1. Battery protection, similar to PCM, overcharge, overdischarge, overtemperature, overcurrent, and short circuit protection.

2. Energy balance, the entire lithium-ion battery pack, because many batteries are connected in series, after a period of operation, due to the inconsistency of the battery cell itself, the inconsistency of the working temperature and other reasons, it will eventually show a big difference. It has a huge impact on the life of the battery and the use of the system. Energy balance is to make up for the differences between individual battery cells to do some active or passive charge or discharge management to ensure the consistency of the battery and extend the life of the battery.

3. SOC calculation. Due to the development of technology, many methods have been accumulated for SOC calculation. If the accuracy is not high, the remaining power can be judged based on the battery voltage. The most accurate method is the current integration method (also called the Ah method), Q= idt, there are internal resistance method, neural network method, Kalman filter method and so on.

4. Communication. Different systems have different requirements for communication interfaces. The mainstream communication interfaces include SPI, I2C, CAN, RS485, etc. Among them, the automobile and energy storage system are mainly CAN and RS485.

⒌Battery balance: that is, the single lithium-ion battery is balanced and charged, so that each battery in the battery pack reaches a balanced and consistent state. Equalization technology is the key technology of a battery energy management system that is currently being researched and developed in the world.

How to purchase BMS lithium-ion battery protection board:

At present, the market is full of various protection board lithium-ion batteries, the better ones are Sanyo's, the worse ones are UF, and the lithium-ion battery protection board itself is also very different. It is very important to choose a protection board battery that suits your flashlight. .