Film-armored battery and method of manufacturing the battery
AssigneeNEC Corporation
InventorsMakihiro Otohata, Nobuaki Yoshioka
Life of this patent
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Abstract
In a film-packed battery which stores a battery element (9) with packing films (8a, 8b) and sealed by heat-sealing heat-sealed surfaces of the packing films around the battery element, a heat-sealed portion (6) projecting toward a battery element is provided at part of a heat-sealed portion (5), and a gas releasing portion (7) is formed close to the projecting heat-sealed portion. A pressure safety valve for safely releasing a gas to the outside when the gas is generated in the battery is provided without lowering the reliability of the battery.
Claims18
A film-packed battery characterized by comprising:
- a battery element made of an electrolyte;
- a packing film which stores the battery element and sealed by heat-sealing part of a bonding surface thereof around said battery element;
- a projecting heat-sealed portion formed in part of a heat-sealed portion by heat seal to project toward said battery element;
- and
- a gas releasing portion formed in at least one of said projecting heat-sealed portion and heat-sealed:
- portion adjacent thereto.
A method of manufacturing a film-packed battery, characterized by comprising the steps of:
- storing a battery element in a packing film;
- sealing a bonding surface of the packing film around the battery element by heat seal;
- forming, in part of a heat-sealed portion by heat seal simultaneously with heat seal of the bonding surface, a projecting heat-sealed portion which is continuous toward the battery element;
- and
- forming a gas releasing portion in at least one of the projecting heat-sealed portion and the heat-sealed portion adjacent to the projecting heat-sealed portion.
Dependencies are inferred from the claim text.