Electricity storage device production method and structure body inspection device

• US 10,444,294 B2
• Filed: 01/28/2016
• Issued: 10/15/2019
• Est. Priority Date: 02/03/2015
• Status: Active Grant

• Current Assignee: J.E.T. Co., Ltd.
• Original Assignee: J.E.T. Co., Ltd.
• Inventors: Hashimoto, Shigeki
• Primary Examiner(s): Le, Son T
• Assistant Examiner(s): Dickinson, Dustin R
• Application Number:
  US15/547,140
• Publication Number:
  US 20180011144A1
• Time in Patent Office: 1,356 Days
• CPC Class Codes: G01R 31/3865 related to manufacture, e.g. testing after manufacture
• CPC Class Codes: G01R 31/387 Determining ampere-hour charge capacity or SoC
• CPC Class Codes: G01R 31/389 Measuring internal impedance, internal conductance or related variables
• CPC Class Codes: H01G 11/84 Processes for the manufacture of hybrid or EDL capacitors, or components thereof
• CPC Class Codes: H01G 13/00 Apparatus specially adapted for manufacturing capacitors; Processes specially adapted for manufacturing capacitors not provided for in groups H01G4/00 - H01G11/00
• CPC Class Codes: H01M 10/0587 of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
• CPC Class Codes: H01M 10/4285 Testing apparatus
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02E 60/13 Energy storage using capacitors
• CPC Class Codes: Y02P 70/50 Manufacturing or production processes characterised by the final manufactured product

Abstract

An inspection device (20) for inspecting a structure body (10) including a pair of electrodes and a separator disposed between the pair of electrodes is provided, the inspection device (20) includes: a measurement unit (30) including a direct-current constant voltage generator (32) that generates a constant inspection voltage applied to the pair of electrodes, and a detection circuit (34) that detects a current value between the pair of electrodes resulting from the application of the inspection voltage; and a processing unit (50) that determines whether the structure body (10) is defective or non-defective based on the detected current value, and the processing unit (50) 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 (10) as a defective product, and an auxiliary function that obtains a peak current value I_peak, a peak current appearing time t_peak and a current area S_I of a current waveform representing variation in current value I over passage of time t, and if any one of the peak current value I_peak, the peak current appearing time t_peak and the current area S_I deviates from a preset threshold value including an upper limit value and a lower limit value, determines the structure body as a defective product.

Claims

1. A method for producing a power storage device including a step of inspecting a structure body, the structure body including a pair of electrodes and a separator disposed between the pair of electrodes, the step of inspecting the structure body comprising:

measuring a current value between the pair of electrodes resulting from an application of a constant inspection voltage at a predetermined interval, the inspection voltage being applied between the pair of electrodes;

determining that the structure body is defective when observing either at least two points or no point at which a ratio (Δ

I/Δ

t) of a current value variation amount (Δ

I) to a time variation amount (Δ

t) varies from a value of no less than 0 to a negative value during an inspection period of time immediately after the application of the inspection voltage until the current value becomes constant;

obtaining a peak current value I_peak, a peak current appearing time t_peak and a current area S_I of a current waveform representing variation in current value I over passage of time t during the inspection period of time; and

determining that the structure body is defective when any one of the peak current value I_peak, the peak current appearing time t_peak and the current area S₁ deviates from preset upper and lower limits.

2. An inspection device for inspecting a structure body including a pair of electrodes and a separator disposed between the pair of electrodes, the inspection device comprising:

a measurement unit including;

a direct-current constant voltage generator configured to generate a constant inspection voltage to be applied to the pair of electrodes; and

a detection circuit configured to detect a current value between the pair of electrodes resulting from the application of the inspection voltage; and

a processing unit configured to determine whether the structure body is defective or non-defective based on the detected current value, the processing unit being configured to;

determine that the structure body is defective when observing either at least two points or no point at which a ratio (Δ

I/Δ

t) of a current value variation amount (Δ

I) to a time variation amount (Δ

t) varies from a value of no less than 0 to a negative value during an inspection period of time immediately after the application of the inspection voltage until the current value becomes constant;

obtain a peak current value I_peak, a peak current appearing time t_peak and a current area S₁ of a current waveform representing variation in current value I over passage of time t during the inspection period of time; and

determine that the structure body is defective when any one of the peak current value I_peak, the peak current appearing time t_peak and the current area S_I deviates from preset upper and lower limits.