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求助,BQ2057充电不能充满



你好,目前使用BQ2057TTS对两节串联的18650锂电池充电(单节的额定电压是3.7V)。充电输入电压Vin是9~100V可调的,所以先用芯片LM5017调整电压至10V,再用BQ2057对电池组充电。现在是可以实现充电,但充电到电池组电压约为7.6V时就停止充了,用示波器观察发现,电池电压瞬间升到9.4V,然后就停止充电了。拔插一下充电源,可以重新开始充电,但过几分钟又会停止,为什么会这样呢,远不到8.1V就停止充了。