Thinking Of Active Balance Circuit Of Battery Protection Board

Thinking of Active Balance Circuit of Battery Protection Board

The system is mainly composed of a single battery protection board management circuit and a vehicle controller. The single battery management circuit is composed of a single battery detection unit and a single battery equalization charging unit. The detection unit uses an adaptive Kalman filter algorithm to calculate the single battery. sOC, the balance charging unit uses a flyback converter to supplement the battery pack as a whole to the battery with a lower SOC, so as to achieve the consistency of the SOC of each single battery within a controllable range.

The communication mode between each single battery management circuit adopts CAN bus communication, and the communication between the single battery management circuit and the vehicle controller is realized through the CAN-USB bus adapter. The vehicle controller is connected with the CAN bus of the single battery management circuit through the USB-CAN bus adapter, which realizes the sending and receiving of the information of the single battery management circuit. By adopting the distributed structure of CAN bus, the connection of the system is reduced, which is convenient for system installation and debugging.

The single battery protection board management circuit adopts CAN bus for communication and connection. The CAN bus consists of 4 signal lines, GND_CAN is the ground wire of the external power supply interface, CANL is the CAN bus L signal, CANH is the CAN bus H signal, +5VCAN External power supply interface for CAN module +5V power supply. odd stands for odd-numbered modules, and even for even-numbered modules. The single battery management circuits respectively lead out two wires to connect with the single batteries, so that the single battery management circuits can be disconnected from the single batteries at any time.