Patent ID: 11949118
Assignee: DAI NIPPON PRINTING CO., LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  B  Y | IPC B  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 the heat-sealable resin layers face each other in a peripheral edge portion of the housing body,
a joined edge portion in which the mutually facing heat-sealable resin layers are fused together is formed in the peripheral edge portion of the housing body,
the valve device is configured to reduce an internal pressure of the housing body if the internal pressure is increased due to gas generated in the housing body,
the valve device includes a first portion that is located on an outer side of an outer edge of the joined edge portion and a second portion that is sandwiched between the heat-sealable resin layers in the joined edge portion, and
recessed portions are formed in outer surfaces of a pair of the at least one laminate where the second portion of the valve device is sandwiched between the heat-sealable resin layers of the pair of the at least one laminate, the recessed portions are a concaved shape in a direction towards the second portion of the valve device,
wherein an end part of the concaved recessed portions are rounded with a radius of curvature ranging from 0.02 mm to 1 mm.