Electricity storage device production method and structure body inspection device

Abstract

An inspection device () for inspecting a structure body () including a pair of electrodes and a separator disposed between the pair of electrodes is provided, the inspection device () includes: a measurement unit () including a direct-current constant voltage generator () that generates a constant inspection voltage applied to the pair of electrodes, and a detection circuit () that detects a current value between the pair of electrodes resulting from the application of the inspection voltage; and a processing unit () that determines whether the structure body () is defective or non-defective based on the detected current value, and the processing unit () has a function that, if two or more points at which a ratio (ΔI/Δt) of a current value variation amount (ΔI) to a time variation amount (Δt) varies from a value of no less than 0 to a negative value are observed or no point at which the ratio (ΔI/Δt) varies from a value of no less than 0 to a negative value is observed during a period of time immediately after the application of the inspection voltage until the current value becomes constant, determines the structure body () as a defective product, and an auxiliary function that obtains a peak current value I, a peak current appearing time tand a current area Sof a current waveform representing variation in current value I over passage of time t, and if any one of the peak current value I, the peak current appearing time tand the current area Sdeviates from a preset threshold value including an upper limit value and a lower limit value, determines the structure body as a defective product.