| CPC G01R 31/392 (2019.01) [B60L 58/12 (2019.02); B60L 58/25 (2019.02); G01R 31/3842 (2019.01); G01R 31/389 (2019.01); H01M 10/4257 (2013.01); H01M 10/486 (2013.01); B60L 2240/545 (2013.01); B60L 2240/547 (2013.01); B60L 2240/549 (2013.01); H01M 2010/4271 (2013.01); H01M 2220/20 (2013.01)] | 4 Claims |
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1. A battery management apparatus comprising:
a battery;
a storage device; and
a controller,
wherein the storage device stores output maps corresponding respectively to deterioration levels, each of the output maps being a map in which a maximum value of electric power outputtable from the battery is associated with a state-of-charge of the battery and a temperature of the battery, each of the deterioration levels being an indicator indicating a degree of deterioration of the battery, and
wherein the controller comprises i) at least one processor and ii) at least one memory storing instructions that, when executed by the at least one processor, cause the at least one processor to:
set a discharge pattern indicating a temporal transition of the electric power output from the battery, the discharge pattern being determined based on thermal parameters of the battery such that a predicted heat generation amount and a predicted heat release amount of the battery are equal to each other during discharge;
acquire a measured electric-current value and a measured voltage value of the battery by causing the battery to output the electric power in accordance with the discharge pattern;
derive, as an estimate resistance value, an estimate value of internal resistance of the battery based on the measured electric-current value and the measured voltage value acquired in accordance with the discharge pattern;
derive the deterioration level at a derivation point of the estimate resistance value based on the estimate resistance value;
determine an output map corresponding to the derived deterioration level from among the output maps; and
control the electric power to be output from the battery based on the output map.
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