SECONDARY BATTERY INSPECTION METHOD

摘要

PROBLEM TO BE SOLVED: To provide a secondary battery inspection method capable of accurately estimating internal resistance of a secondary battery at a temperature included in a low-temperature range.SOLUTION: An inspection process S1 for estimating internal resistance Rof a secondary battery 1 at a temperature Tin a low-temperature range to evaluate an output of the secondary battery 1 includes: a step (S13) of calculating constants A and B in a resistance response calculation formula by using actual measurement values Rand Rof resistance response of the secondary battery 1 adjusted at temperatures Tand Tin a normal temperature range; a step (S14) of calculating constants C and D in a DC resistance calculation formula by using actual measurement values Rand Rof DC resistance of the secondary battery 1 adjusted at temperatures Tand T; a step (S15) of calculating resistance response Rfrom the resistance response calculation formula into which the calculated constants A and B are substituted; a step (S16) of calculating DC resistance Rfrom the DC resistance calculation formula into which the calculated constants C and D are substituted; and a step (S17) of calculating the internal resistance Rfrom the resistance response Rand the DC resistance R.