Power storage device

Patent metadata

Field	Value
Publication number	US-10727455-B2
Application number	US-201816117224-A
Country	US
Kind code	B2
Filing date	Aug 30, 2018
Priority date	Sep 12, 2017
Publication date	Jul 28, 2020
Grant date	Jul 28, 2020

Abstract

A power storage device includes an electrode assembly including a first electrode and a second electrode, a first collector terminal connected to the first electrode, a second collector terminal connected to the second electrode, an accommodation case which accommodates the electrode assembly, and an insulating film arranged between the accommodation case and the electrode assembly. The first collector terminal is higher in electrical conduction resistance than the second collector terminal. The insulating film is provided with a first cut at a position adjacent to the first collector terminal and a second cut at a position adjacent to the second collector terminal. The first cut is smaller in area than the second cut.

First claim

What is claimed is:

1. A power storage device comprising:
an electrode assembly including a first electrode and a second electrode;
a first collector terminal connected to the first electrode;
a second collector terminal connected to the second electrode;
an accommodation case which accommodates the electrode assembly; and
an insulating film arranged between the accommodation case and the electrode assembly,
the first collector terminal being higher in electrical conduction resistance than the second collector terminal,
the insulating film being provided with a first cut at a position adjacent to the first collector terminal and a second cut at a position adjacent to the second collector terminal, and
the first cut being smaller in area than the second cut.

2. The power storage device according to claim 1 , wherein
the electrode assembly is a winding assembly formed to surround an axial line of winding,
the electrode assembly includes a first end surface located at one end in a direction of extension of the axial line of winding and having the first electrode formed and a second end surface located at the other end in the direction of extension of the axial line of winding and having the second electrode formed,
the insulating film includes a first wall portion and a second wall portion arranged as being opposed to the first end surface and arranged as being superimposed on each other and a third wall portion and a fourth wall portion arranged as being opposed to the second end surface and arranged as being superimposed on each other,
the first cut is provided in the first wall portion, and
the second cut is provided in the third wall portion.

3. The power storage device according to claim 1 , wherein
the first cut is provided at a position opposed to an end portion of the first collector terminal, and
the second cut is provided at a position opposed to an end portion of the second collector terminal.

Assignees

• Toyota Motor Co Ltd

Inventors

• Kobayashi Keiichiro
• Yamane Shingo

Classifications

• H01M10/0431 Primary

  Cells with wound or folded electrodes (H01M10/045 takes precedence) · CPC title

• H01M50/469

  tubular or cylindrical · CPC title

• H01M50/477

  characterised by their shape · CPC title

• H01M50/486

  Organic material · CPC title

• H01M50/474

  characterised by their position inside the cells · CPC title