Lithium battery protection boards have different circuits and parameters according to different ICs and voltages used. Commonly used protection ICs are 8261, DW01+, CS213, GEM5018, etc. Among them, Seiko's 8261 series have better accuracy and of course the price is more expensive. The latter are from Taiwan. The domestic secondary market basically uses DW01+ and CS213. The following is an explanation with DW01+ with MOS tube 8205A (8pin): The normal working process of the lithium battery protection board is: When the cell voltage is 2.5 When between V and 4.3V, DW01 pin 1 and pin 3 output high level (equal to the supply voltage)

1. Ultra-low power consumption design makes BP20200T extremely low static power consumption during battery operation and storage. 2. The low pressure drop design makes the power loss extremely small. The protection board generates little heat by itself. 3. Over current, over temperature, under voltage, over charge, and short circuit protection all have the "HOLD" function, which makes the protection action extremely reliable. It completely avoids the battery being damaged, avoids the shortening of battery life caused by over-discharge or short-circuit, and completely avoids the possibility of repeated shutdown and damage to the protection board.

I. Overview The electric vehicle lithium battery protection board is a bridge between the power battery and the outside world, and determines the utilization rate of the battery. Its performance is very important to the cost and safety of the electric vehicle. It can collect, process, and store important information during the operation of the battery pack in real time, and exchange information with external devices to provide real-time alarm and protection during the operation of the battery pack. B generally adopts a distributed architecture design and consists of a master control device and multiple slave control devices.