| CPC G01R 31/388 (2019.01) [G01R 31/389 (2019.01); H01M 10/486 (2013.01); H01M 10/0525 (2013.01)] | 4 Claims |
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1. A durability evaluation method of a secondary battery, the durability evaluation method comprising:
a durability step of continuing to apply an alternating current voltage of a durability frequency to a first secondary battery for evaluation over a durability test period, a temperature and a state of charge (SOC) of the first secondary battery being adjusted to a first temperature and a first SOC, respectively;
a determination step of determining whether the durability test period has elapsed; and
based on the determination that the durability test period has elapsed, an evaluation step of evaluating durability of an associated battery reaction associated with the durability frequency from among battery reactions of the first secondary battery,
wherein the durability evaluation method further comprises:
an initial adjustment step of adjusting the temperature and the SOC of the first secondary battery to a second temperature and a second SOC, the second temperature and the second SOC being determined in advance;
a pre-durability impedance measurement step of measuring a first impedance of the adjusted first secondary battery over an evaluation frequency range;
a pre-durability adjustment step of adjusting the temperature and the SOC of the first secondary battery to the first temperature and the first SOC, the initial adjustment step, the pre-durability impedance measurement step, and the pre-durability adjustment step being executed before the durability step;
a post-durability adjustment step of adjusting the temperature and the SOC of the first secondary battery after the durability step to the second temperature and the second SOC; and
a post-durability impedance measurement step of measuring a second impedance of the adjusted first secondary battery over the evaluation frequency range, the post-durability adjustment step and the post-durability impedance measurement step being executed after the durability step and before the evaluation step,
wherein in the evaluation step, the durability of the battery reaction of the first secondary battery is evaluated using the first impedance and the second impedance obtained for the first secondary battery,
wherein the durability test period includes a first durability test period and a second durability test period, the first durability test period being a period in a case where a durability test is conducted once and the second durability test period being a period in a case where the durability test is conducted twice.
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