非四线制锂电池组实时电压检测校正方法研究

针对锂电池LIB(Lithium-ion pack)组非四线制状态下的线压降补偿问题,提出了一种锂电池组充放电过程中电压实时采样校正新方法。该方法通过分析锂电池组充放电过程中线压降机制,研究各单体处于不同充放电组合状态时对采样的影响,实现对锂电池组电压信号实时有效监测。实验结果表明,在锂电池组工作状态下电压采样过程中,该方法能够有效解决非四线制锂电池组电压采样问题,采样电压与锂电池组单体实际电压差异在5 m V以内。所提出的非四线制线压降补偿方法能够有效解决锂电池组实时准确采样问题,能够准确表征锂电池组实际工作状态。

Non-four-wire Lithium Battery Pack Voltage Detecting Correction Method Study

Purpose] A novel voltage real-time sampling correcting method is proposed for the real-time sampling of discharge and charge process of LIB (lithium-ion battery) packs, which is aiming to solve the line voltage drop compensation problem of non-four-wire LIB packs. Methods] In this method, the midline drop mechanism of LIB charge and discharge process is analyzed and the impact of different combinations of charge and discharge status on the sampling is studied, which is aiming to achieve effective voltage signal real-time monitoring of LIB packs. Results] Experimental results show that, in the work status voltage sampling process, this method can effectively solve the non-four-wire LIB pack voltage sampling problem. The difference between the actual voltage and the sampling voltage of LIB cells is within 5mV. Conclusions] The proposed non-four-wire cable drop compensation method can effectively solve the accurate real-time sampling problem of LIB packs, which can characterize the actual working conditions accurately.