Battery and method of manufacturing battery

Patent metadata

Field	Value
Publication number	US-9318770-B2
Application number	US-201114237304-A
Country	US
Kind code	B2
Filing date	Aug 9, 2011
Priority date	Aug 9, 2011
Publication date	Apr 19, 2016
Grant date	Apr 19, 2016

Abstract

It is a task of the invention to provide a battery that allows a gas produced inside a flat wound electrode body to be easily discharged to the outside of the electrode body, and restrains an electrolytic solution (a retained electrolytic solution) extruded from the flat wound electrode body through charge/discharge from directly flowing out to the outside of the flat wound electrode body, and a method of manufacturing this battery. The battery is equipped with a flat wound electrode body, a collector member, and a retained electrolytic solution. The flat wound electrode body has an active material layer wound portion that is obtained by winding an electrode plate, has a flat oval cross-section, and has a wound active material layer forming portion, and an exposed wound portion that has a wound foil exposed portion. An exposed wound central portion is detached from at least one of two exposed wound end portions while maintaining contact with an active material layer wound portion that is adjacent to the exposed wound central portion in an axial direction. The collector member is joined to the exposed wound central portion.

First claim

The invention claimed is:

1. A battery comprising:
a flat wound electrode body that is obtained by winding an electrode plate around a winding axis, the electrode plate including a band-shaped active material layer forming portion that is obtained by forming an active material layer on a band-shaped metal foil along a first end edge as one of two end edges extending in a longitudinal direction of the metal foil, and a band-shaped foil exposed portion that has the metal foil exposed along a second end edge as the other of the two end edges of the metal foil, that has a flat oval cross-section, and that has an active material layer wound portion that is obtained by winding the active material layer forming portion, and an exposed wound portion that is located on one side in an axial direction along the winding axis with respect to the active material layer wound portion and has the foil exposed portion that is wound;
a collector member that is made of a metal, and is joined to the exposed wound portion of the flat wound electrode body; and
a retained electrolytic solution that is retained by the active material layer wound portion of the flat wound electrode body, wherein
when regions of the exposed wound portion that are located at both end portions of the oval cross-section in a major axis direction respectively and are obtained by bending back the foil exposed portion into a shape of R are defined as R-shaped exposed wound portions, regions of the exposed wound portion that include the R-shaped exposed wound portions are defined as exposed wound end portions, and a region of the exposed wound portion that is located in a central region in the major axis direction and is sandwiched between the exposed wound end portions is defined as an exposed wound central portion,
the exposed wound central portion is detached from at least one of the two exposed wound end portions, while maintaining contact with the active material layer wound portion that is adjacent to the exposed wound central portion in the axial direction, and
the collector member is joined to the exposed wound central portion.

2. The battery according to claim 1 , wherein
the exposed wound central portion is detached from both the exposed wound end portions.

3. The battery according to claim 1 , wherein
the exposed wound central portion is constituted by a region of the exposed wound portion other than the two R-shaped exposed wound portions.

4. A method of manufacturing a battery that is equipped with:
a flat wound electrode body that is obtained by winding an electrode plate around a winding axis, the electrode plate including a band-shaped active material layer forming portion that is obtained by forming an active material layer on a band-shaped metal foil along a first end edge as one of two end edges extending in a longitudinal direction of the metal foil, and a band-shaped foil exposed portion that has the metal foil exposed along a second end edge as the other of the two end edges of the metal foil, that has a flat oval cross-section, and that has an active material layer wound portion that is obtained by winding the active material layer forming portion, and an exposed wound portion that is located on one side in an axial direction along the winding axis with respect to the active material layer wound portion and has the foil exposed portion that is wound;
a collector member that is made of a metal, and is joined to the exposed wound portion of the flat wound electrode body; and
a retained electrolytic solution that is retained by the active material layer wound portion of the flat wound electrode body, wherein
when regions of the exposed wound portion that are located at both end portions of the oval cross-section in a major axis direction respectively and are obtained by bending back the foil exposed portion into a shape of R are defined as R-shaped exposed wound portions, regions of the exposed wound portion that include the R-shaped exposed wound portions are defined as exposed wound end portions, and a region of the exposed wound portion that is located in a central region in the major axis direction and is sandwiched between the exposed wound end portions is defined as an exposed wound central portion,
the exposed wound central portion is detached from at least one of the two exposed wound end portions, while maintaining contact with the active material layer wound portion that is adjacent to the exposed wound central portion in the axial direction, and
the collector member is joined to the exposed wound central portion,
the method comprising:
joining the collector member to the exposed wound central portion as to the flat wound electrode body in which the exposed wound central portion of the exposed wound portion and at least one of the two exposed wound end portions of the exposed wound portion are detached from each other.

Assignees

• Kobayashi Kiwamu
• Sano Hideki
• Wakamatsu Naoki
• Toyota Motor Co Ltd

Inventors

• Kobayashi Kiwamu
• Sano Hideki
• Wakamatsu Naoki

Classifications

• H01M50/553

  Terminals adapted for prismatic, pouch or rectangular cells · CPC title

• H01M50/55

  on the same side of the cell · CPC title

• H01M50/536

  characterised by the method of fixing the leads to the electrodes, e.g. by welding · CPC title

• H01M50/534

  characterised by the material of the leads or tabs · CPC title

• H01M4/64

  Carriers or collectors · CPC title