Method of manufacturing secondary battery, and secondary battery

Patent metadata

Field	Value
Publication number	US-2016126583-A1
Application number	US-201514925445-A
Country	US
Kind code	A1
Filing date	Oct 28, 2015
Priority date	Oct 30, 2014
Publication date	May 5, 2016
Grant date	—

Abstract

In a fixing process, a fixing tape is wound around a first side surface of an electrode body and a second side surface which is a rear surface of the first side surface across a first end surface and a second end surface positioned at both ends of the electrode body in a stacking direction of the electrode body, from an outside of the stacked electrode body. In a stacking process before the fixing process, the electrode body is formed, and at least at a corner in the first and second side surfaces of the electrode body on a downstream side of a direction in which the fixing tape is wound, a protection member which protects the corner is disposed.

First claim

What is claimed is:

1 . A method of manufacturing a secondary battery which includes a stacked electrode body which is made by stacking a positive plate and a negative plate while interposing a separator between the positive plate and the negative plate, a fixing tape which is wound around an outside of the stacked electrode body and prevents deformation of the electrode body, and a battery case in which the electrode body around which the fixing tape is wound and an electrolyte are accommodated, the method comprising:
stacking the positive plate, the negative plate, and the separator, forming the electrode body through the stacking, and disposing a protection member having higher bending strength than any of the positive plate, the negative plate, and the separator on at least an outer peripheral surface of the electrode body; winding the fixing tape, across at least a first end surface and a second end surface positioned at both ends of the electrode body in a stacking direction of the electrode body, around a first side surface adjacent to the first end surface and the second end surface of the electrode body and a second side surface which is a rear surface of the first side surface, from an outside of a portion of the electrode body on which the protection member is disposed, and fixing the fixing tape; and accommodating the electrode body around which the fixing tape is wound and the electrolyte in the battery case, wherein during the stacking, the protection member is disposed on at least one of the first end surface and the first side surface at a first corner where the first end surface and the first side surface of the electrode body intersect, and at least one of the second end surface and the second side surface at a second corner where the second end surface and the second side surface of the electrode body intersect, and during the fixing, the fixing tape is wound around the first side surface of the electrode body in a direction from the second end surface toward the first end surface, and is wound around the second side surface of the electrode body in a direction from the first end surface toward the second end surface.

2 . A method of manufacturing a secondary battery which includes a stacked electrode body which is made by stacking a positive plate and a negative plate while interposing a separator between the positive plate and the negative plate, a fixing tape which is wound around an outside of the stacked electrode body and prevents deformation of the electrode body, and a battery case in which the electrode body around which the fixing tape is wound and an electrolyte are accommodated, the method comprising:
stacking the positive plate, the negative plate, and the separator, forming the electrode body through the stacking, and disposing a protection member having higher bending strength than any of the positive plate, the negative plate, and the separator on at least an outer peripheral surface of the electrode body; winding the fixing tape, across at least a first end surface and a second end surface positioned at both ends of the electrode body in a stacking direction of the electrode body, around a first side surface adjacent to the first end surface and the second end surface of the electrode body and a second side surface which is a rear surface of the first side surface, from an outside of a portion of the electrode body on which the protection member is disposed, and fixing the fixing tape; and accommodating the electrode body around which the fixing tape is wound and the electrolyte in the battery case, wherein during the stacking, the protection member is disposed on at least one of the first end surface and the first side surface at a first corner where the first end surface and the first side surface of the electrode body intersect, and at least one of the first end surface and the second side surface at a second corner which is positioned on the opposite side of the first corner of the electrode body with the first end surface interposed between the first corner and the second corner, and during the fixing, the fixing tape is wound around the first side surface of the electrode body in a direction from the second end surface toward the first end surface, and is wound around the second side surface of the electrode body in a direction from the second end surface toward the first end surface.

3 . The method of manufacturing a secondary battery according to claim 1 , wherein
the protection member includes a first side surface portion positioned on the first side surface of the electrode body in a state where the protection member is disposed on the electrode body, a second side surface portion positioned on the second side surface of the electrode body, and a stacked portion which is positioned between stacks of the electrode body and of which both ends are respectively connected to the first side surface portion and the second side surface portion, the first side surface portion extends from the end of the stacked portion on the first side surface side toward the first corner, and the second side surface portion extends from the end of the stacked portion on the second side surface side toward the second corner.

4 . The method of manufacturing a secondary battery according to claim 2 , wherein
the protection member includes a first side surface portion positioned on the first side surface of the electrode body in a state where the protection member is disposed on the electrode body, a second side surface portion positioned on the second side surface of the electrode body, and a stacked portion which is positioned between stacks of the electrode body and of which both ends are respectively connected to the first side surface portion and the second side surface portion, the first side surface portion extends from the end of the stacked portion on the first side surface side toward the first corner, and the second side surface portion extends from the end of the stacked portion on the second side surface side toward the second corner.

5 . The method of manufacturing a secondary battery according to claim 1 , wherein
as the protection member, a first end surface protection member which is stacked on the first end surface of the electrode body to be disposed on the first end surface of the electrode body and a second end surface protection member which is stacked on the second end surface of the electrode body to be disposed on the second end surface of the electrode body are used, the first end surface protection member includes a first protection portion that extends toward at least the first side surface in a state where the first end surface protection member is disposed on the electrode body, and the second end surface protection member includes a second protection portion that extends toward at least the second side surface in a state where the second end surface protection member is disposed on the electrode body.

6 . The method of manufacturing a secondary battery according to claim 2 , wherein
as the protection member, an end surface protection member which is stacked on the first end surface of the electrode body to be disposed on the first end surface of the electrode body is used, and the end surface protection member includes a first protection portion that extends toward at least the first side surface and a second protection portion that extends toward at least the second side surface in a state where the end surface protection member is disposed on the electrode body.

7 . The method of manufacturing a secondary battery according to claim 5 , wherein
in the state where the protection member is disposed on the electrode body, the first protection portion protrudes outward from the first side surface, and t

Assignees

• Toyota Motor Co Ltd

Inventors

• Kato Masashi
• Matsumoto Mizuho

Classifications

• H01M10/049 Primary

  Processes for forming or storing electrodes in the battery container · CPC title

• H01M50/103

  prismatic or rectangular (H01M50/109, H01M50/11 take precedence) · CPC title

• H01M2/0237

  Electricity · mapped topic

• H01M10/058

  Construction or manufacture · CPC title

• H01M2/08

  Electricity · mapped topic