Electricity storage device

Patent metadata

Field	Value
Publication number	US-9343727-B2
Application number	US-201314420563-A
Country	US
Kind code	B2
Filing date	Aug 9, 2013
Priority date	Aug 28, 2012
Publication date	May 17, 2016
Grant date	May 17, 2016

Abstract

An electricity storage device includes an electrode assembly such that positive and negative electrodes are alternately stacked in which the positive and negative electrodes are insulated from one another. Tab groups each including positive or negative electrode tabs bundled in the stacking direction of the electrode assembly are provided on an edge portion of the electrode assembly. The tab groups each include a first bent portion and an extending portion, which extends from the first bent portion in the stacking direction of the electrode assembly. The tab groups also each include a second bent portion at which the tab group is curved or bent such that the distal end in the extending direction of the tab that is located at an outermost position of the first bent portion is positioned between the electrode assembly and the tab that is located at an innermost position of the first bent portion.

First claim

The invention claimed is:

1. An electricity storage device, comprising:
one or more positive electrodes each having an edge portion and a tab on the edge portion;
one or more negative electrodes each having an edge portion and a tab on the edge portion;
an electrode assembly configured such that the positive electrodes and the negative electrodes are alternately stacked in a state in which the positive electrodes and the negative electrodes are insulated from each other;
an electrode terminal, which transfers electricity between the electrode terminal and the electrode assembly;
a conductive member, which electrically connects the electrode assembly and the electrode terminal;
tab groups each including tabs of the positive electrodes or tabs of the negative electrodes bundled in a stacking direction of the electrode assembly, wherein the tab groups are provided on an edge portion of the electrode assembly and connected to the conductive member; and
a case, which accommodates the conductive member and the electrode assembly, wherein
the tab groups each include a first bent portion, which is curved or bent, and an extending portion, which extends from the first bent portion in the stacking direction of the electrode assembly,
each extending portion includes a connecting portion electrically connected to the conductive member, and
the tab groups each include a second bent portion at which the tab group is curved or bent such that a distal end in the extending direction of the tab that is located at an outermost position of the first bent portion is positioned between the electrode assembly and the tab that is located at an innermost position of the first bent portion.

2. The electricity storage device according to claim 1 , wherein each second bent portion and the case are insulated from each other.

3. The electricity storage device according to claim 1 , wherein the distal end contacts an electrode having the same polarity and the tab that is located at the innermost position of the first bent portion.

4. The electricity storage device according to claim 1 , wherein the second bent portion is curved or bent such that the second bent portion is substantially in parallel with the extending portion in a range from the first bent portion to the second bent portion.

5. The electricity storage device according to claim 1 , wherein the second bent portion is curved or bent in the same direction as the bending direction of the first bent portion.

6. The electricity storage device according to claim 1 , wherein the electricity storage device is a rechargeable battery.

Assignees

• Toyota Jidoshokki Kk

Inventors

• Okuda Motoaki
• MINAGATA Atsushi

Classifications

• H01M10/0413 Primary

  Large-sized flat cells or batteries for motive or stationary systems with plate-like electrodes · CPC title

• H01G11/76 Primary

  specially adapted for integration in multiple or stacked hybrid or EDL capacitors · CPC title

• H01M2220/20

  Batteries in motive systems, e.g. vehicle, ship, plane · CPC title

• H01M10/6553

  Terminals or leads · CPC title

• H01M10/0463

  Cells or batteries with horizontal or inclined electrodes · CPC title