Secondary battery

Patent metadata

Field	Value
Publication number	US-10381677-B2
Application number	US-201615016819-A
Country	US
Kind code	B2
Filing date	Feb 5, 2016
Priority date	Feb 9, 2015
Publication date	Aug 13, 2019
Grant date	Aug 13, 2019

Abstract

A secondary battery includes a rolled electrode body, a case main body that has a shape of an open cylinder with a bottom; a case cover, a first electrode terminal, and a second electrode terminal. The first electrode terminal and the second electrode terminal support the rolled electrode body. The first electrode terminal is fixed to the case cover, with one end being exposed to the outside of the case main body, and the other end being connected to a first collector portion. The second electrode terminal is fixed, together with the negative-electrode electrode terminal, to the case cover, with one end being exposed to the outside of the case main body, and the other end being connected to a second collector portion.

First claim

What is claimed is:

1. A secondary battery comprising:
a rolled electrode body that includes a positive electrode sheet, a negative electrode sheet, a separator, a positive electrode collector portion, and a negative electrode collector portion,
the positive electrode sheet and the negative electrode sheet being rolled with the separator sandwiched therebetween,
the positive electrode collector portion being formed on one end in a direction of a rolling axis, and the negative electrode collector portion being formed on the other end in the direction of the rolling axis;

a case main body that is rectangular shaped, within which the rolled electrode body is housed in an orientation in which the rolling axis is orthogonal to a bottom surface of the case main body;
a case cover that closes off an upper opening of the case main body;
a first electrode terminal that is fixed to the case cover, one end of the first electrode terminal being exposed to an outside of the case main body, and the other end of the first electrode terminal being connected to a first collector portion, the first collector portion being one of the positive electrode collector portion and the negative electrode collector portion, whichever is positioned on an upper side of the rolled electrode body inside the case main body;
a second electrode terminal that is fixed, together with the first electrode terminal, to the case cover, one end of the second electrode terminal being exposed to the outside of the case main body, and the other end of the second electrode terminal being connected to a second collector portion, the second collector portion being one of the positive electrode collector portion and the negative electrode collector portion, whichever is positioned on a lower side of the rolled electrode body,
the first electrode terminal and the second electrode terminal supporting the rolled electrode body wherein

the second electrode terminal includes a vertical support plate and a horizontal support plate;
the vertical support plate extends toward the bottom surface of the case main body along the rolled electrode body;
the horizontal support plate is connected to a lower end of the vertical support plate;
the second collector portion is fixed on top of the horizontal support plate; and
in the second collector portion, an edge of one sheet, from among the positive electrode sheet and the negative electrode sheet, is exposed, and the edge of each pitch of the one sheet is independently joined to the horizontal support plate at multiple scattered points,
wherein the vertical support plate is inserted through an inside of the rolled electrode body,
the vertical support plate passes through a center hole of the rolled electrode body, and
a length of the center hole in a long direction of the vertical support plate is longer than a half length of the vertical support plate in the long direction.

2. The secondary battery according to claim 1 , wherein
the vertical support plate is one of a pair of vertical support plates, and
the pair of the vertical support plates extend toward the bottom surface of the case main body, sandwiching the rolled electrode body from both sides.

3. The secondary battery according to claim 1 , wherein
the rolled electrode body is rolled flat having a portion where the positive electrode sheet, the negative electrode sheet, and the separator extend linearly, and a portion where the positive electrode sheet, the negative electrode sheet, and the separator are curved, when viewed from the rolling axis direction; and
the horizontal support plate is connected to only one side of the portion that extends linearly, with an axis of the flat rolled electrode body through the rolling axis, as a boundary, when viewed from the rolling axis direction, the axis of the flat rolled electrode body is perpendicular to the rolling axis and parallel to the portion that extends linearly.

4. The secondary battery according to claim 1 wherein
the case main body and the case cover are insulating bodies, or the case main body and the case cover are insulated from the rolled electrode body.

Assignees

• Toyota Motor Co Ltd

Inventors

• Kato Masashi
• Matsumoto Mizuho

Classifications

• H01M50/531

  Electrode connections inside a battery casing · CPC title

• H01M50/553

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

• H01M50/55

  on the same side of the cell · CPC title

• H01M50/119

  Metals · CPC title

• H01M2/022

  Electricity · mapped topic