Multiple cell lithium-ion battery system electric fault online diagnostics

This paper introduces an integrated online electrical safety diagnostic algorithm for lithium-ion battery systems, which includes the detection of over charge, over discharge, external short circuit and internal short circuit faults. Experiments were conducted for each fault and the safety criteria, presented by a combination of voltage, current and temperature, were built according to empirical results. Based on the criteria, an integrated electrical fault diagnostic algorithm is proposed. Experimental results show that the proposed algorithm is effective and robust at detecting and distinguishing electric faults for multiple cell battery arrangements online.

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