Sealing cell

Abstract

To surely weld a sealing body to a battery case by reducing welding defects. After an electrolyte is injected into a battery case 6 from an electrolyte injection hole 16, the electrolyte injection hole 16 is closed by a sealing plug 17, and the sealing plug 17 is welded to a peripheral part of the electrolyte injection hole 16, whereby the electrolyte injection hole 16 is sealed. The sealing plug 17 is formed of a clad material formed by vertically joining an aluminum layer 25 to a nickel layer 26; the aluminum layer 25 is arranged on the battery case 6 side; and a peripheral part 25a of the aluminum layer 25 is projected to the outside of the sealing plug 17 relative to an edge of the nickel layer 26 and welded to a peripheral part of the electrolyte injection hole 16 by laser.

Description

technical field

[0001] The present invention relates to sealed batteries such as lithium ion batteries. Background technique

[0002] Patent Documents 1 to 3 disclose a sealed battery in which an electrode body, an electrolytic solution, and the like are accommodated in a battery can, and the upper surface opening of the battery can is closed with a cover to form a battery case. In this sealed battery, the electrolyte solution is injected into the battery can through a liquid injection hole provided on the cover, and then the liquid injection hole is blocked with a sealing body composed of a sealing plug or a plate, and then the liquid is sealed with a laser or the like. The sealing body is welded to the upper surface of the cap which is the peripheral portion of the liquid injection hole, so that the liquid injection hole is sealed with the sealing body.

[0003] The sealed battery can be used as a power source to be mounted on external equipment such as a mobile phone or ...

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