The connection fault characteristics of parallel battery modules were analyzed by the designed connection fault testing method,which showed that the larger the connection fault resistance was,the larger the terminal voltage deviation was.The voltage and branch current characteristics at different connection fault degrees were explored by the fault simulation model.The results show that the closer the fault location to the load connection point is,the smaller the impact on the uneven distribution of each branch current is.The characteristics of voltage,current and incremental capacity(IC)curves at different connection fault degrees indicate that there are significant differences in the branch current.The characteristics of the IC curve vary greatly at different C-rates.The peak Ⅱ is relatively stable,which has correlation with the connection resistance.
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