SEALED SECONDARY BATTERY DETERIORATION DIAGNOSIS METHOD AND DETERIORATION DIAGNOSIS SYSTEM
World Intellectual Property Organization Patent
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Abstract
A sealed secondary battery deterioration diagnosis method comprising: a step for detecting deformation of the sealed secondary battery to determine a first curved line indicating the relationship between a discharge capacity from the fully charged state or a charge capacity to the fully charged state and the detected deformation amount of the sealed secondary battery; a step for determining a second curved line L2 indicating the relationship between said charge/discharge capacity and the slope of the first curved line; a step for calculating a charge/discharge capacity Qc between stage change points P1, P2 appearing as minimum values on the second curved line L2; and a step for calculating the maintenance rate of an active material on the basis of a ratio Qc/Qs of the charge/discharge capacity Qc with respect to a charge/discharge capacity Qs between stage change points Ps1, Ps2 in a predetermined reference state.
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