Degassing hole formation process and degassing hole formation apparatus for secondary battery
AssigneesNissan Motor Co., Ltd., Automotive Energy Supply Corporation
InventorsYuzo Kato, Nobuaki Akutsu
Life of this patent
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Abstract
A degassing hole is formed in a casing in which a storage element is housed. Prior to forming the degassing hole, the casing is clamped in a region between the outer peripheral edge of the casing and the storage element where the degassing hole is to be formed such that overlapped films of the casing are pressed tightly together. By displacing the acting position of the clamping force toward the storage element while reducing the clamping force gradually toward the storage element prevent, liquid spill in a degassing process is prevented.
Claims8
A degassing hole formation process for a secondary battery manufacturing method, the secondary battery manufacturing method comprising:
- a first sealing process in which outer peripheral edges of overlapped films are joined to form a casing having a joint portion formed on an outer peripheral edge thereof and a storage element is housed in an interior of the casing;
- a degassing process in which gas in the interior of the casing is discharged to an exterior of the casing through a degassing hole;
- and
- a second sealing process in which the degassing hole is sealed,
- wherein the degassing hole formation process comprises:
- forming the degassing hole in a site located between the joint portion on the outer peripheral edge of the casing and the storage element such that the degassing process is performed through the degassing hole, by pressing a region including the site of the casing in which the degassing hole is formed from respective sides of the casing so that the overlapped films are pressed tightly together gradually in a direction approaching the storage element from a position distant from the storage element while reducing a pressing force gradually toward the storage element, and forming the degassing hole in a pressed region.
A degassing hole formation apparatus applied to a degassing hole formation process performed by a secondary battery manufacturing apparatus, wherein the secondary battery manufacturing apparatus is configured to perform:
- a first sealing process in which outer peripheral edges of overlapped films are joined to form a casing having a joint portion formed on an outer peripheral edge thereof and a storage element is housed in an interior of the casing;
- and
- a degassing process in which gas in the interior of the casing is discharged to an exterior of the casing;
- wherein the degassing hole formation apparatus is configured to form a degassing hole in a site located between the joint portion on the outer peripheral edge of the casing and the storage element such that the degassing process is performed through the degassing hole, and
- wherein the degassing hole formation apparatus comprises:
- a pressing device configured to press a region including the site of the casing in which the degassing hole is formed from respective sides of a surface of the casing so that the overlapped films are pressed together gradually in a direction approaching the storage element from a position located at a distance from the storage element while reducing a pressing force gradually toward the storage element;
- and
- a cutter configured to form the degassing hole in a pressed region.
Dependencies are inferred from the claim text.