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BQ40Z50: BQ40Z50+BQ24133+BQ2980组成的BMS,电池包电压异常

Part Number: BQ40Z50
Other Parts Discussed in Thread: BQ2980

目前才用了4个4V的锂电池二串二并,电池包供电异常,测量现象VC1电压只有1.1v,VC2电压正常显示4v,原理图在附件。

麻烦帮我看看是否存在设计上的问题