Hermetically sealed battery and method for manufacturing the same

Patent metadata

Field	Value
Publication number	US-9634298-B2
Application number	US-201013381858-A
Country	US
Kind code	B2
Filing date	Jul 21, 2010
Priority date	Aug 5, 2009
Publication date	Apr 25, 2017
Grant date	Apr 25, 2017

Abstract

A sealed battery including: an electrode group 4 formed by winding or stacking a positive electrode plate 1 and a negative electrode plate 2 with a separator 3 interposed between the positive electrode plate 1 and the negative electrode plate 2 , and housed in a battery case 5 , an opening of the battery case 5 being sealed with a sealing plate, wherein a lead 11 extending from one of the electrode plates in the electrode group 4 is laser-welded to the sealing plate 10 , and a melting width of an end section 13 of a welded portion 9 between the lead 11 and the sealing plate 10 is smaller than a melting width of a center section of the welded portion 9.

First claim

The invention claimed is:

1. A sealed battery comprising:
an electrode group formed by winding or stacking a positive electrode plate and a negative electrode plate with a separator interposed between the positive electrode plate and the negative electrode plate, and housed in a battery case, an opening of the battery case being sealed with a sealing plate, wherein
a lead extending from one of the electrode plates in the electrode group includes a welded portion linearly laser-welded to the sealing plate by continuously scanning a laser beam,
the laser beam has a spot diameter smaller than a thickness of the lead,
the linearly welded portion has, in its longitudinal direction, only one end section at which welding is started, and only one other end section at which welding is terminated, and
the only one other end section, of the welding portion, at which welding is terminated has a melting width in an extending direction of the lead narrower than a melting width in an extending direction of the lead of a center section of the welding portion, and
the melting width of the only one other end section at which welding is terminated of the linearly welded portion is substantially constant.

2. The sealed battery of claim 1 , wherein the lead includes the welded portion formed by continuously scanning a laser beam having a spot diameter smaller than a thickness of the lead between its surface on which the welded portion is formed and a surface opposite thereto.

3. The sealed battery of claim 1 , wherein the melting width of the center section of the linearly welded portion is substantially constant.

Assignees

• Harima Yukio
• Funami Koji
• Kumazawa Seiji
• Miyata Kyosuke
• Fukuoka Takahiro
• Kato Seiichi
• Panasonic Ip Man Co Ltd

Inventors

• Harima Yukio
• Funami Koji
• Kumazawa Seiji
• Miyata Kyosuke
• Fukuoka Takahiro
• Kato Seiichi

Classifications

• H01M50/528 Primary

  Fixed electrical connections, i.e. not intended for disconnection · CPC title

• H01M50/159

  Metals · CPC title

• H01M50/167

  by crimping · CPC title

• H01M50/171 Primary

  using adhesives or sealing agents · CPC title

• H01M50/152

  for cells having curved cross-section, e.g. round or elliptic (H01M50/15, H01M50/153 take precedence) · CPC title