# US 12,603,348 B2 · Secondary battery having an insulation member

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 12,603,348 B2
- Document ID: US12603348B2
- Status: Granted
- Kind: B2
- Application number: 17/901,574
- Filed: 2022-09-01
- Published: 2023-07-20
- Granted: 2026-04-14
- Earliest claimed: 2022-01-18
- Assignees: Samsung SDI Co., Ltd.
- Applicants: Samsung SDI Co., Ltd.
- Inventors: Hyun Soo Lee; Jun Sun Yong
- Web page: https://patentgrep.com/patent/US12603348B2

## CPC

- H01M 10/653: characterised by electrically insulating or thermally conductive materials
- H01M 50/10: Primary casings; Jackets or wrappings
- H01M 10/0413: {Large-sized flat cells or batteries for motive or stationary systems with plate-like electrodes}
- H01M 50/103: prismatic or rectangular (H01M50/109, H01M50/11 take precedence)
- H01M 50/1245: {characterised by the external coating on the casing}
- H01M 50/126: comprising three or more layers
- H01M 50/129: with two or more layers of only organic material
- H01M 50/166: characterised by the methods of assembling casings with lids
- H01M 50/183: Sealing members
- H01M 50/119: Metals
- 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; a case accommodating the electrode assembly, the case having a bottom surface and long and short sidewalls that extend upwardly from the bottom surface; a cap plate coupled to an upper portion of the case and sealing the case; and an insulation member attached to an outer surface of the case. The insulation member includes a first layer in contact with the outer surface of the case and made of a heat-resistant material, a third layer exposed to the outside and made of a stretchable material, and a second layer between the first and third layers and made of an insulating material.

## Claims

### Claim 1

A secondary battery comprising:
an electrode assembly;
a case accommodating the electrode assembly, the case having a bottom surface and long and short sidewalls that extend upwardly from the bottom surface;
a cap plate coupled to an upper portion of the case and sealing the case; and
an insulation member attached to an outer surface of the case, the insulation member comprising a first layer in contact with the outer surface of the case and made of a heat-resistant material, a third layer exposed to the outside and made of a stretchable material, and a second layer between the first and third layers and made of an insulating material, each of the first, second, and third layers comprising thermoplastic,
wherein a first surface of the second layer directly contacts the first layer and an opposite second surface of the second layer directly contacts the third layer.

### Claim 2 (depends on 1)

The secondary battery of claim 1, wherein the insulation member has a first region and a second region covering the long sidewalls of the case and a third region between the first region and the second region and covering the bottom surface of the case.

### Claim 3 (depends on 2)

The secondary battery of claim 2, wherein the first region has a first sidewall extension part extending to one of the short sidewalls of the case, the second region has a second sidewall extension part extending to the one of the short sidewalls of the case, and the third region has a third sidewall extension part extending to the one of the short sidewalls of the case.

### Claim 4 (depends on 3)

The secondary battery of claim 3, wherein a portion of the one of the short sidewalls overlaps and is covered by the first sidewall extension part, the second sidewall extension part, and the third sidewall extension part.

### Claim 5 (depends on 3)

The secondary battery of claim 3, wherein a cut portion of the insulating member in the third sidewall extension part has two slits spaced apart from each other.

### Claim 6 (depends on 5)

The secondary battery of claim 5, wherein the cut portion is spaced apart from an interface between the first sidewall extension part and the third sidewall extension part and an interface between the second sidewall extension part and the third sidewall extension part.

### Claim 7 (depends on 2)

The secondary battery of claim 2, wherein the first region has a first upper extension part extending to the cap plate, and the second region has a second upper extension part extending to the cap plate.

### Claim 8 (depends on 7)

The secondary battery of claim 7, wherein the first upper extension part and the second upper extension part cover an edge of the cap plate.