IP Library › Granted Patent US 9,705,111
Granted Patent B2
US 9,705,111 · App. 14/692,182 · Granted Jul 11, 2017

Secondary battery and method for manufacturing the same

Inventors: Hiroya Umeyama (Okazaki, JP); Hiroshi Takamatsu (Moriguchi, JP); Yukio Harima (Hirakata, JP); Yasushi Hirakawa (Moriguchi, JP)
Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
H01M2/043B23K26/0608B23K26/20B23K26/24H01M2/0426H01M2/0439B23K2201/36B23K2203/10H01M2220/20
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Quick Facts
Patent No.
US 9,705,111
App. No.
14/692,182
Granted
Jul 11, 2017
Kind
B2
Abstract

Provided is a secondary battery in which a battery lid is fixed to a battery case by inserting the battery lid into an opening of the battery case having the opening, and emitting laser beams to a butting portion between the battery case and the battery lid to perform butt welding, wherein, when a battery lid-side welding mark formed in the battery lid has a distance from a surface of the battery lid to a lower end of the battery lid-side welding mark which is defined as a battery lid-side welding depth, and a battery case-side welding mark formed in the battery case has a distance from the surface of the battery lid to a lower end of the battery case-side welding mark which is defined as a battery case-side welding depth, the battery lid-side welding depth is deeper than the battery case-side welding depth.

Claims (5)

1. A secondary battery in which a battery lid is fixed to a battery case by inserting said battery lid into an opening of said battery case having said opening, and emitting laser beams to a butting portion between said battery case and said battery lid to perform butt welding, wherein

when a battery lid-side welding mark formed in said battery lid has a distance from a surface of said battery lid to a lowest end of said battery lid-side welding mark which is defined as a battery lid-side welding depth, and a battery case-side welding mark formed in said battery case has a distance from the surface of said battery lid to a lowest end of said battery case-side welding mark which is defined as a battery case-side welding depth, said battery lid-side welding depth is deeper than said battery case-side welding depth, and

a ratio between said battery case-side welding depth and said battery lid-side welding depth has a value of 65% to 85%.

2. The secondary battery according to claim 1 , having a penetration region between said battery lid-side welding mark and said battery case-side welding mark, wherein a distance from the surface of said battery lid to a lowest end of the penetration region has a depth shallower than said battery lid-side welding depth and said battery case-side welding depth.

3. The secondary battery according to claim 1 , wherein a heat capacity of the battery lid is larger than a heat capacity of the battery case.

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Apr 21, 2015
From: UMEYAMA, HIROYA; TAKAMATSU, HIROSHI; HARIMA, YUKIO; HIRAKAWA, YASUSHI
To: TOYOTA JIDOSHA KABUSHIKI KAISHA
Reel/Frame 035460/0858 →
Priority Claims (1)
JP 2014-113961 · Jun 2, 2014 · national
Continuity (1)
Related Publication 20150349303A1 · Dec 3, 2015