METHOD FOR INSPECTING BATTERY

• US 20140285208A1
• Filed: 03/21/2014
• Published: 09/25/2014
• Est. Priority Date: 12/05/2011
• Status: Active Grant

• Current Assignee: Envision AESC Japan Co., Ltd.
• Original Assignee: Automotive Energy Supply Corporation (Envision Group /TX/)
• Inventors: MIZUTA, Masatomo, Kimura, Aika
• Granted Patent: US 9,761,915 B2
• Time in Patent Office: Days
• US Class Current: 324/433
• CPC Class Codes: H01M 10/0525 Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
• CPC Class Codes: H01M 10/0585 of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators
• CPC Class Codes: H01M 10/48 Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte constructional details of current conducting connections for detecting conditions inside cells or batteries, e.g. details of voltage sensing terminals, H01M50/569
• CPC Class Codes: H01M 50/124 having a layered structure
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02P 70/50 Manufacturing or production processes characterised by the final manufactured product

Abstract

A method for inspecting a battery, comprising: a first withstanding voltage determination step of housing an electrode laminate within a package and applying a first voltage between a positive electrode terminal and a negative electrode terminal to perform a first withstanding voltage determination in a state in which an electrolyte solution is not poured in the package; and a second withstanding voltage determination step of applying a second voltage which is higher than the first voltage between the positive electrode terminal or the negative electrode terminal and metallic layers of pair of laminate films to perform a second withstanding voltage determination in the state in which the electrolyte solution is not poured in the package.

Claims

1. A method for inspecting a battery, the battery comprising:

an electrode laminate in which a positive electrode, a porous separator, and a negative electrode are laminated;

a positive electrode terminal connected to the positive electrode;

a negative electrode terminal connected to the negative electrode;

a package including a metallic layer and a resin layer disposed on an inside of the metallic layer and in an inside of which the electrode laminate and an electrolyte solution are housed and sealed in a state in which one end of each of the positive electrode and the negative electrode is projected externally, the method comprising;

a first withstanding voltage determination step of housing the electrode laminate within the package and applying a first voltage between the positive electrode terminal and the negative electrode terminal in a state in which the electrolyte solution is not poured in the package to perform a first withstanding voltage determination;

a second withstanding voltage determination step of applying a second voltage which is higher than the first voltage between the positive electrode terminal or the negative electrode terminal and the metallic layer to perform a second withstanding voltage determination in the state in which the electrolyte solution is not poured in the package, wherein the electrode laminate is formed by an alternate lamination of a plurality of the positive electrodes and the negative electrodes and a plurality of the porous separators, the package comprises a pair of laminate films, each laminate film including the metallic layer and the resin layer, and is formed by joining mutual peripheral edge sections of the pair of laminate films in a state in which respective parts of the positive electrode terminal and the negative electrode terminal are projected externally, and wherein the battery is a lithium ion secondary battery and, at the second withstanding voltage determination step, a withstanding voltage measurement between the negative electrode terminal and the metallic layers of the pair of laminate films is made.

2. The method for inspecting the battery as claimed in claim 1, wherein each of the resin layers has no cavity or extremely fewer cavities.

3. The method for inspecting the battery as claimed in claim 1, wherein the first withstanding voltage determination step and the second withstanding voltage determination step are carried out, with probes contacted on the positive electrode terminal, the negative electrode terminal, and the metallic layers.