| CPC G01R 31/367 (2019.01) [G01R 31/3648 (2013.01); G01R 31/374 (2019.01); G01R 31/385 (2019.01)] | 15 Claims |
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1. An apparatus for diagnosing a battery, the apparatus comprising:
a voltage measuring circuit configured to measure a voltage across both terminals of a battery cell;
a current measuring circuit configured to measure a current flowing at either terminal of the battery cell;
a voltage estimation circuit configured to calculate an estimated voltage level based on the measured current and a status estimation model;
a diagnostic circuit configured to:
calculate a voltage level difference between a voltage level of the measured voltage and the estimated voltage level, and,
determine whether or not an error has occurred in the battery cell based on a comparison of the calculated voltage level difference and a reference value; and,
a control circuit configured to:
adjust the reference value according to an estimation accuracy, wherein the estimation accuracy is based on a difference between the estimated voltage levels calculated by the voltage estimation circuit at different time points of charging the battery; and
control the battery according to an output of the diagnostic circuit.
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