Manufacturig method for battery
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.
1. A manufacturing method for 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 terminal and the negative electrode terminal is projected externally, the method comprising:
forming the electrode laminate by an alternate lamination of a plurality of the positive electrodes and the negative electrodes and a plurality of the porous separators,
forming the package comprising a pair of laminate films, each laminate film including the metallic layer and the resin layer, 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, a top surface and a bottom surface of the electrode laminate each being covered with a respective one of the pair of laminate films; and
inspecting the battery, wherein inspecting the battery comprises:
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; 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 a metallic layer to perform a second withstanding voltage determination in the state in which the electrolyte solution is not poured in the package.
2. The manufacturing method for the battery as claimed in claim 1 , wherein each of the resin layers has no cavity or extremely fewer cavities.
3. The manufacturing method for 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 contacting the positive electrode terminal, the negative electrode terminal, and the metallic layers.
4. The manufacturing method for the battery as claimed in claim 1 , wherein in the second withstanding voltage determination step, the second voltage is applied between the negative electrode terminal and the metallic layer, and a withstanding voltage measurement between the negative electrode terminal and the metallic layers of the pair of laminate films is made.
5. The manufacturing method for the battery as claimed in claim 1 , wherein the battery is a lithium ion secondary battery.