# US 11,114,717 B2 · Lithium secondary battery

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- Number: US 11,114,717 B2
- Document ID: US11114717B2
- Status: Granted
- Kind: B2
- Application number: 16/254,185
- Filed: 2019-01-22
- Published: 2019-05-23
- Granted: 2021-09-07
- Earliest claimed: 2015-10-07
- Assignees: SK Innovation Co., Ltd.
- Applicants: SK Innovation Co., Ltd.
- Inventors: Hee-Gyoung Kang
- Web page: https://patentgrep.com/patent/US11114717B2

## CPC

- H01M 10/052: Li-accumulators
- H01M 50/183: Sealing members
- H01M 50/176: for prismatic or rectangular cells (H01M50/181 takes precedence)
- H01M 50/179: for cells having curved cross-section, e.g. round or elliptic (H01M50/176, H01M50/181 take precedence)
- H01M 50/538: Connection of several leads or tabs of wound or folded electrode stacks
- H01M 2220/20: Batteries in motive systems, e.g. vehicle, ship, plane
- 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

The present invention provides a lithium secondary battery which includes an electrode assembly to which an electrode tap is attached, an electrode tap receptor configured to house a portion of the electrode assembly such that a portion of the electrode tap protrudes to an outside, and a case configured to surround the electrode assembly and seal the electrode assembly together with the electrode tap receptor, wherein the electrode tap receptor includes a gas barrier layer.

## Claims

### Claim 1

A lithium secondary battery comprising:
an electrode assembly to which an electrode tap is attached;
an electrode tap receptor configured to house a portion of the electrode assembly; wherein the electrode tap receptor comprises a hole through which a portion of the electrode tap protrudes to an outside; and
a case formed from one sheet configured to surround the electrode assembly,
wherein an end of the electrode tap receptor and an end of the case partially overlap each other, and the end of the case is disposed over the end of the electrode tap receptor to seal the electrode assembly,
wherein the case surrounds sides of the electrode assembly to which the electrode tap is not attached,
wherein the electrode tap receptor includes a gas barrier layer,
wherein the gas barrier layer includes at least one selected from a group consisting of ethylene-vinyl alcohol copolymer, polyvinylidene chloride, polyvinyl alcohol, nylon, polyamide, polyacrylonitrile, ionomer copolymer, a coating layer made of at least one selected from a group consisting of silica, alumina, rubber, glass and amorphous carbon, and a film having a coating layer in which layered silicate nano particles are dispersed in a polyvinyl alcohol binder,
wherein the electrode tap receptor is formed in a plurality of layers, and the gas barrier layer is included in an inner layer of the electrode tap receptor, and
wherein the gas barrier layer is formed on a portion of the electrode tap receptor which contacts the electrode assembly.

### Claim 2 (depends on 1)

The lithium secondary battery according to claim 1, wherein the electrode tap receptor further includes an electrolyte storage part.

### Claim 3 (depends on 1)

The lithium secondary battery according to claim 1, further comprising: a sub receptor provided on an opposite surface of the electrode assembly relative to one surface to which the electrode tap is attached to house a portion the electrode assembly including the opposite surface,
wherein the sub receptor includes a gas barrier layer.

### Claim 4 (depends on 1)

The lithium secondary battery according to claim 1, wherein the electrode tap includes a first electrode tap and a second electrode tap which are attached to surfaces of the electrode assembly facing each other, and
wherein the electrode tap receptor includes a first electrode tap receptor configured to house a portion of the electrode assembly, and a second electrode tap receptor configured to house a portion of the electrode assembly,
wherein the first electrode tap receptor comprises a hole through which a portion of the first electrode tap protrudes to the outside, and the second electrode tap receptor comprises a hole through which a portion of the second electrode tap protrudes to the outside.

### Claim 5 (depends on 1)

The lithium secondary battery according to claim 1, wherein a portion in which the case and the electrode tap receptor contact each other is sealed by an adhesive or thermal fusion bonding.

### Claim 6 (depends on 1)

The lithium secondary battery according to claim 1, wherein the case is formed of at least one selected from a group consisting of polyethylene, polypropylene, polyethylene terephthalate and polyethylene naphthalate.