Patent ID: 11949120
Assignee: DAI NIPPON PRINTING CO., LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  Y | IPC H

Claim 0:
1. A battery comprising:
a battery element;
a housing body that is constituted by at least one laminate including at least a base material layer, a barrier layer, and a heat-sealable resin layer layered in that order and houses the battery element; and
a valve device that is in communication with the inside of the housing body,
wherein sections of the heat-sealable resin layer of the at least one laminate face each other in a peripheral edge portion of the housing body,
a joined edge portion in which the mutually facing sections of the heat-sealable resin layer of the at least one laminate are fused together is formed in the peripheral edge portion of the housing body,
the valve device includes:
a first portion in which a valve mechanism is formed, the valve mechanism being configured to reduce an internal pressure of the housing body if the internal pressure is increased due to gas generated in the housing body; and
a second portion in which an air passage is formed, the air passage being configured to guide gas generated in the housing body toward the valve mechanism,
the first portion is located on an outer side of an outer edge of the joined edge portion and is not sandwiched between the sections of the heat-sealable resin layer of the at least one laminate that are fused together in the joined edge portion,
the first portion and the second portion of the valve device are separate from the housing body,
at least a portion of the second portion is sandwiched between the sections of the heat-sealable resin layer of the at least one laminate in the joined edge portion,
in a thickness direction of the battery, a length of the first portion is longer than a length of the second portion,
a step is formed at a boundary between the first portion and the second portion,
the first portion and the second portion are made of different resin materials, and
the resin material of the first portion has a higher melting point than the resin material of the second portion.