| CPC G01R 31/389 (2019.01) [G01R 31/3842 (2019.01); G01R 31/396 (2019.01)] | 11 Claims |
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1. A battery diagnosis method comprising:
calculating, by a battery management system (BMS), a plurality of direct current internal resistances (DCIRs) respectively with respect to a plurality of battery cells based on a plurality of cell voltages and a plurality of cell currents respectively with respect to the plurality of battery cells connected in parallel;
deriving, by the BMS, an entire representative value of the plurality of DCIRs based on the plurality of DCIRs;
calculating, by the BMS, a multi-parallel ideality factor based on a parallel connection number, the parallel connection number being a number of the plurality of battery cells connected in parallel;
calculating, by the BMS, a dispersion of the plurality of DCIRs based on the plurality of DCIRs and the entire representative values of the plurality of DCIRs;
calculating, by the BMS, an upper limit threshold value of a normal range based on the entire representative value of the plurality of DCIRs, the multi-parallel ideality factor, and the dispersion of the plurality of DCIRs; and
deriving, by the BMS, the normal range based on the upper limit threshold value, and diagnosing a state of a battery pack including the plurality of battery cells according to the normal range.
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