电池管理系统循环复位和无响应故障机理及解决措施

BMS Cyclic Reset and No Response Failure Mechanism and Solution

分析48 V混合动力系统构成和电池管理系统(BMS)控制原理,设计试验研究了12 V电源电压变化对48 V动力电池工作状态的影响,发现12 V电源供电电压过低时BMS微控制单元(MCU)芯片存在循环复位现象和BMS无响应问题。针对该问题提出了BMS控制逻辑优化方案,在BMS监测到12 V电源供电电压低于6 V时不在MCU内存储工作数据,该控制逻辑可以避免MCU写入故障值,从而解决供电电压过低时MCU芯片故障导致的BMS无响应问题。实车验证结果表明,该控制逻辑可以有效提高BMS的抗低压能力。

The 48 V hybrid power system and Battery Management System(BMS)control principle were analyzed,the influence of 12 V power supply voltage variation on 48 V power batteries was tested and studied,it is found that,when the 12 V power supply voltage is low,the BMS Microcontroller Unit(MCU)chip has a cyclic reset phenomenon and BMS no respond issue.For this problem,this paper proposed a BMS control logic optimization.The BMS detects that the battery state data will not be saved in MCU chip when the 12 V power supply voltage is lower than 6 V.This control logic can solve the BMS no respond issue by preventing the MCU writing the fault value.It is verified by real vehicles that the control logic can effectively improve the anti-low voltage ability of BMS.