# US 8,771,870 B2 · Secondary battery having a sealing gasket with concave and convex portions

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- Number: US 8,771,870 B2
- Document ID: US8771870B2
- Status: Granted
- Kind: B2
- Application number: 12/436,749
- Filed: 2009-05-06
- Published: 2009-08-27
- Granted: 2014-07-08
- Earliest claimed: 2004-10-28
- Assignees: Samsung SDI Co., Ltd.
- Applicants: Sang-Eun Cheon; Jae-Kyung Kim; Hye-Won Yoon; Seok-Yoon Yoo
- Inventors: Sang-Eun Cheon; Jae-Kyung Kim; Hye-Won Yoon; Seok-Yoon Yoo
- Web page: https://patentgrep.com/patent/US8771870B2

## CPC

- H01M 50/171: using adhesives or sealing agents
- H01M 50/167: by crimping
- H01M 50/184: characterised by their shape or structure
- H01M 50/186: characterised by the disposition of the sealing members
- Y02E 60/10: Energy storage using batteries
- Y02P 70/50: Manufacturing or production processes characterised by the final manufactured product
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS

## Abstract

A secondary battery includes an electrode assembly having a positive electrode, a negative electrode and a separator interposed between the positive and negative electrodes and a container for receiving the electrode assembly inside thereof. The secondary battery also includes a cap assembly fixed to the container to seal the container and a gasket disposed between the container and the cap assembly. The gasket has at least one concavo-convex portion on a surface contacting the container and/or the cap assembly. This improved gasket structure enhances the air tightness of the secondary battery.

## Claims

### Claim 1

A secondary battery, the secondary battery comprising:
a container;
a cap assembly fixed to the container to seal the container;
a gasket, the gasket having a bent end portion having a first surface configured to contact the container and a second surface opposite the first surface and configured to contact the cap assembly, and the gasket having a plurality of concave and convex portions on at least one of the first and second surfaces at the bent end portion; and
at least one O-ring in at least one of the plurality of concave and convex portions.

### Claim 2 (depends on 1)

The secondary battery of claim 1, wherein the gasket has a plurality of concave and convex portions on the first and second surfaces at the bent end portion.

### Claim 3

A secondary battery, comprising:
a container;
a cap assembly fixed to the container to seal the container; and
a gasket between the container and the cap assembly, the gasket having a bent end portion configured to contact the container and/or the cap assembly;
wherein a plurality of concavo-convex portions are on an inner circumferential surface of the bent end portion and an outer circumferential surface of the bent end portion along an axial direction of the gasket;
wherein the plurality of concavo-convex portions are continuously along a circumference of the gasket; and
wherein the secondary battery further comprises at least one O-ring in at least one of the plurality of concavo-convex portions.

### Claim 4 (depends on 3)

The secondary battery of claim 3, wherein the plurality of concavo-convex portions each include a concave portion and a convex portion, the concave portion and the convex portion having an are cross-section.

### Claim 5 (depends on 3)

The secondary battery of claim 3, wherein the plurality of concavo-convex portions each include a concave portion and a convex portion, the concave portion and the convex portion having a triangle cross-section.

### Claim 6 (depends on 3)

The secondary battery of claim 3, wherein the plurality of concavo-convex portions each include a concave portion and a convex portion, the concave portion and the convex portion having a square cross-section.

### Claim 7 (depends on 6)

The secondary battery of claim 6, wherein the gasket comprises a body portion and the thickness of the convex portion is substantially equal to the thickness of the body portion.

### Claim 8 (depends on 6)

The secondary battery of claim 6, wherein the gasket comprises a body portion and the thickness of the convex portion is greater than the thickness of the body portion.