Rectangular secondary battery

Patent metadata

Field	Value
Publication number	US-10833372-B2
Application number	US-201816012173-A
Country	US
Kind code	B2
Filing date	Jun 19, 2018
Priority date	Jun 26, 2017
Publication date	Nov 10, 2020
Grant date	Nov 10, 2020

Abstract

An electrode body, which includes a positive electrode plate and a negative electrode plate, is contained in a battery case, which is composed of a rectangular casing and a sealing plate. A first positive-electrode tab group, which is composed of a plurality of positive electrode tabs, and a second positive-electrode tab group, which is composed of a plurality of positive electrode tabs, are disposed between the sealing plate and the electrode body. The first positive-electrode tab group and the second positive-electrode tab group are disposed so as to be displaced from each other in the longitudinal direction of the sealing plate. The first positive-electrode tab group and the second positive-electrode tab group are connected to different positions on a positive-electrode current collector.

First claim

What is claimed is:

1. A rectangular secondary battery, comprising:
a rectangular casing that has an opening;
a sealing plate that seals the opening;
an electrode body that is disposed in the rectangular casing and that includes at least one positive electrode plate and at least one negative electrode plate;
a plurality of tabs that are connected to the at least one positive electrode plate or the at least one negative electrode plate;
a current collector that is connected to the plurality of tabs; and
a terminal that is electrically connected to the current collector and that protrudes from the sealing plate toward an outside of the battery,
wherein a first tab group that is composed of a plurality of the plurality of tabs and a second tab group that is composed of a plurality of the plurality of tabs are connected to the electrode body,
wherein the first tab group and the second tab group are disposed between the sealing plate and the electrode body,
wherein the first tab group and the second tab group are disposed so as to be displaced from each other in a longitudinal direction of the sealing plate, and
wherein the first tab group and the second tab group are connected to different positions on the current collector.

2. The rectangular secondary battery according to claim 1 ,
wherein the electrode body includes a first electrode body element and a second electrode body element,
wherein the first tab group is connected to the first electrode body element, and
wherein the second tab group is connected to the second electrode body element.

3. The rectangular secondary battery according to claim 2 ,
wherein the first electrode body element and the second electrode body element are each a rolled electrode body element in which the at least one positive electrode plate having a strip-like shape and the at least one negative electrode plate having strip-like shape are rolled up with a separator having a strip-like shape therebetween.

4. The rectangular secondary battery according to claim 3 ,
wherein the plurality of tabs include a plurality of negative electrode tabs that is connected to the at least one negative electrode plate, and
wherein, in the first electrode body element, the number of the plurality of negative electrode tabs that are stacked and included in the first tab group is less than the number of layers of the at least one negative electrode plate that are stacked in a thickness direction of the first electrode body element.

5. The rectangular secondary battery according to claim 3 ,
wherein the electrode body further includes a third electrode body element that is a rolled electrode body element to which a third tab group is connected and a fourth electrode body element that is a rolled electrode body element to which a fourth tab group is connected,
wherein the third tab group is superposed on the first tab group and connected to the current collector, and
wherein the fourth tab group is superposed on the second tab group and connected to the current collector.

6. The rectangular secondary battery according to claim 1 ,
wherein a fuse portion is formed between a portion of the current collector connected to the terminal and a portion of the current collector connected to the first tab group, and a fuse portion is formed between the portion of the current collector connected to terminal and a portion of the current collector connected to the second tab group.

7. The rectangular secondary battery according to claim 1 ,
wherein the terminal includes a flange portion and an insertion portion disposed on the flange portion,
wherein the flange portion is disposed nearer than the sealing plate to the electrode body,
wherein the insertion portion extends through a terminal attachment hole in the sealing plate and is upset at a position further outward from the sealing plate with respect to the battery, and
wherein the current collector is connected to a surface of the flange portion facing the electrode body.

8. The rectangular secondary battery according to claim 1 ,
wherein the current collector includes a base portion and a tab connection portion that is folded from an end of the base portion, and
wherein the base portion and the terminal are connected to each other, and the tab connection portion and the tab are connected to each other.

Assignees

• Sanyo Electric Co

Inventors

• Wakimoto Ryoichi
• Takabayashi Hiroshi

Classifications

• H01M50/583

  in response to current, e.g. fuses · CPC title

• H01M50/176

  for prismatic or rectangular cells (H01M50/181 takes precedence) · CPC title

• H01M50/103

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