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BQ40Z50-R1 EVM给4s1p电芯大电流充电时,CELL电芯容易保护的问题

Other Parts Discussed in Thread: BQ40Z50-R1

BQ40Z50-R1 EVM给4s1p电芯大电流充电,用稳压源2000ma,当充电到90%左右的时候,cell1电压总是比cell234电压高很多,电池保护了;但是当用小一些的电流时,比如1000ma,各电芯电压相差不大,就可以充满,这是什么原因造成的?不是有平衡充电功能吗?