Analysis of BMS lithium battery protection function and purchase method

BMS lithium battery protection function analysis: 1. Battery protection, similar to PCM, overcharge, overdischarge, overtemperature, overcurrent, and short circuit protection. 2. Energy balance, the entire lithium battery pack, because many batteries are connected in series, after working for a certain period of time, 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), Qu003d ∫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 battery is evenly 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. BMS lithium battery protection board purchase method: The market is full of various protection board lithium batteries, the better ones are Sanyo's, the worse ones are UF, and the lithium battery protection board itself is also very different. Choose one that suits your flashlight. The protection board battery is very important. Usually use a torch with a protective battery, such as an incandescent bulb flashlight. As far as the battery cell itself is concerned, the quality and common ones are Sanyo, Panasonic, Sony, Samsung, and AW. Sanyo: Suitable for high-discharge platforms. Sanyo is generally recommended for circuits larger than 1A. The Sanyo high-discharge platform is more durable than Panasonic and has more power. Panasonic: Suitable for low-discharge platforms. Panasonic is recommended for circuits that are usually less than 1A. Panasonic's low-platform discharge lasts longer than Sanyo's, and it has more power. Sony: The performance is similar to Sanyo, but slightly lower than Sanyo. I haven't used Sony since it was recalled because of the process of mixing metal powder into the battery material, which may cause fire and explosion. But it is said that it has been improved at present, but Sanyo has used it, so it is generally not considered unless the price is very reasonable. 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 post: Briefly describe the difference between batteries and lithium batteries