INSPECTION METHOD OF SECONDARY BATTERY

• Main Author: IWASE KOSUKE
• Format: Patent
• Language: English; Japanese
• Published: 25.12.2014
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

PROBLEM TO BE SOLVED: To detect incorporation of a foreign matter into an electrolyte reliably.SOLUTION: A secondary battery 100 includes an electrode body 10 having a positive electrode, a separator and a negative electrode, and an electrolyte 50. An inspection method of the secondary battery 100 includes a step of performing charge/discharge of the secondary battery 100 at a rate higher than that when the secondary battery 100 is used, in a state where a binding force for inspection is not applied to the electrode body 10, a step of measuring the voltage of the secondary battery 100 in a state where a binding force is applied to the electrode body 10, and a step of determining incorporation of a foreign matter into an electrolyte 50 on the basis of the drop of the voltage. 【課題】電解液内への異物の混入を確実に検出する。【解決手段】二次電池１００は、正極、セパレータ、および負極を有する電極体１０と、電解液５０とを含む。二次電池１００の検査方法は、電極体１０に検査用の拘束力が与えられていない状態において、二次電池１００の使用時よりも高い割合で二次電池１００の充放電を実行するステップと、充放電の停止後に、電極体１０に拘束力が与えられている状態において、二次電池１００の電圧を測定するステップと、上記電圧の低下に基づいて、電解液５０内への異物の混入を判定するステップとを含む。【選択図】図３