SEALED SECONDARY BATTERY DETERIORATION DIAGNOSIS METHOD AND DETERIORATION DIAGNOSIS SYSTEM
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United States of America Patent
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May 29, 2015
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Jul 10, 2014
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Abstract
A sealed secondary battery deterioration diagnosis method comprising: a step of detecting deformation of the sealed secondary battery and determining a first curved line representing a relationship between a discharged capacity from a fully charged state or a charged capacity up to the fully charged state and a detected deformation amount of said sealed secondary battery; a step of determining a second curved line L2 representing a relationship between the charged/discharged capacity and a slope of the first curved line; a step of calculating a charged/discharged capacity Qc between stage change points P1, P2 appearing as extremal values on said second curved line L2; and a step of calculating a retention rate of an active substance on the basis of a ratio Qc/Qs of the charged/discharged capacity Qc relative to a charged/discharged capacity Qs between stage change points Ps1, Ps2 in a predetermined reference state.
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