Cylindrical battery

Patent metadata

Field	Value
Publication number	US-11757153-B2
Application number	US-201816634684-A
Country	US
Kind code	B2
Filing date	Jul 5, 2018
Priority date	Jul 31, 2017
Publication date	Sep 12, 2023
Grant date	Sep 12, 2023

Abstract

A cylindrical battery with an opening sealing body that seals an opening of a battery can. The opening sealing body includes a valve member, a metal plate disposed on an inner side of the battery with respect to the valve member, and an annular insulating member interposed between the valve member and the metal plate. The valve member and the metal plate are connected to each other at respective central portions. The valve member has an annular thin-walled portion which is deformable when an internal pressure of the battery increases. The metal plate and the insulating member have respective holes which communicate with each other. The insulating member has a section that covers a surface, on the valve member side, of the metal plate, and a section that is provided subsequent to the section and covers a lateral surface of the hole of the metal plate.

First claim

The invention claimed is:

1. A cylindrical battery comprising: an electrode group; an electrolyte; a battery can that houses the electrode group and the electrolyte; and an opening sealing body that seals an opening of the battery can,
the opening sealing body including a valve member, a metal plate disposed on an inner side of the battery with respect to the valve member, and an annular insulating member interposed between the valve member and the metal plate,
wherein the valve member and the metal plate are connected to each other at respective central portions, the valve member has an annular thin-walled portion which is deformable when an internal pressure of the battery increases,
the metal plate and the insulating member have respective holes which communicate with each other, wherein a plurality of the holes of the metal plate and a plurality of the holes of the insulating member are provided,
the insulating member has a section P 1 that covers a surface, on the valve member side, of the metal plate, and a section P 2 that is provided adjacent to the section P 1 and covers an inner lateral surface of the holes of the metal plate, wherein a proportion of lateral sides, covered by the section P 2 , of the holes of the metal plate is from 20% to 90%, and
wherein the insulating member has a section P 3 that is extended from the section P 2 and covers a surface of the metal plate, said surface of the metal plate facing toward the electrode group in a thickness direction of the metal plate.

2. The cylindrical battery according to claim 1 , wherein the insulating member further has a section P 4 that is provided adjacent to the section P 1 and covers a circumferential end face of the metal plate.

3. The cylindrical battery according to claim 2 , wherein the insulating member further has a section P 5 that is provided adjacent to the section P 4 and covers a surface, on an inner side of the battery, of the metal plate.

4. The cylindrical battery according to claim 3 ,
wherein the section P 5 is provided to cover an area greater than or equal to 0.2 mm from the circumferential end face of the surface, on the inner side of the battery, of the metal plate toward a center.

5. The cylindrical battery according to claim 1 ,
wherein a recessed portion is formed by the thin-walled portion on the insulating member opposing side of the valve member, and
the section P 1 has a rib to be housed in the recessed portion.

6. The cylindrical battery according to claim 5 ,
wherein the section P 1 has an area which covers part of the holes of the metal plate, and
at least part of the rib is provided in the area.

7. The cylindrical battery according to claim 1 ,
wherein the insulating member is integrated with the metal plate by adhesive bonding.

Assignees

• Panasonic Ip Man Co Ltd

Inventors

• Enomoto Takeshi
• Kohira Kazutoshi

Classifications

• H01M10/0422 Primary

  Cells or battery with cylindrical casing · CPC title

• H01M50/325 Primary

  comprising deformable valve members, e.g. elastic or flexible valve members · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title

• Y02P70/50

  Manufacturing or production processes characterised by the final manufactured product · CPC title

• H01M50/152

  for cells having curved cross-section, e.g. round or elliptic (H01M50/15, H01M50/153 take precedence) · CPC title