SECONDARY BATTERY DIAGNOSTIC DEVICE AND SOC UNEVENNESS DETECTION METHOD

To accurately determine whether SOC unevenness occurs in the electrode surface of a secondary battery.SOLUTION: A secondary battery diagnostic device 1 includes a control unit 300 including an information acquisition section and a determination section. The information acquisition section acquires a power storage amount that is the amount of electricity stored in a battery 100 (secondary battery) and V/K indicating the magnitude of change in OCV of the battery 100 with respect to the temperature change of the battery 100. The determination section determines, using the power storage amount and the V/K acquired by the information acquisition section, whether SOC unevenness occurs in the electrode surface of the battery 100.SELECTED DRAWING: Figure 4 【課題】二次電池の電極面内にＳＯＣムラが生じているか否かを的確に判断する。【解決手段】二次電池の診断装置１が、情報取得部と判断部とを含む制御装置３００を備える。情報取得部は、電池１００（二次電池）に蓄えられた電気量である蓄電量と、電池１００の温度変化に対する電池１００のＯＣＶの変化の大きさを示すＶ／Ｋとを取得する。判断部は、情報取得部により取得された蓄電量及びＶ／Ｋを用いて、電池１００の電極面内にＳＯＣムラが生じているか否かを判断する。【選択図】図４