CPC G01R 31/392 (2019.01) [H01M 10/425 (2013.01); H01M 10/4285 (2013.01); H01M 10/482 (2013.01); H01M 2010/4271 (2013.01)] | 10 Claims |
1. A determination device relating to a plurality of batteries which are connected in series, comprising:
a processor configured to determine a deterioration variance among the batteries, based on first voltage data indicative of a maximum voltage which is greatest among voltages of the batteries in each of measurements in a plurality of periods in charge or discharge of the batteries, and second voltage data indicative of a minimum voltage which is least among the voltages of the batteries in each of the measurements in the periods,
wherein the processor is configured to:
estimate a first internal state parameter as an internal state of the battery as an elemental battery, the first internal state parameter being based on a variation of the maximum voltage in the first voltage data;
estimate a second internal state parameter as an internal state of the battery as the elemental battery, the second internal state parameter being based on a variation of the minimum voltage in the second voltage data;
determine the deterioration variance among the batteries, based on at least the first internal state parameter and the second internal state parameter;
estimate a third internal state parameter indicative of an internal state in an entirety of a series-connected part of the batteries, based on at least third voltage data indicative of a voltage of the series-connected part of the batteries in each of the measurements in the periods in the charge or the discharge of the batteries; and
determine the deterioration variance among the batteries by comparing the third internal state parameter with the first internal state parameter and the second internal state parameter.
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