# US 2021/0344033 A1 · Secondary battery

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

- Number: US 2021/0344033 A1
- Document ID: US20210344033A1
- Status: Published application
- Kind: A1
- Application number: 17/283,240
- Filed: 2019-09-24
- Published: 2021-11-04
- Earliest claimed: 2018-10-12
- Assignees: Samsung SDI Co., Ltd.
- Applicants: Samsung SDI Co., Ltd.
- Inventors: Jung Hyun PARK; Hyun Ki JEONG; Nobuyuki OYAGI; Won Ik LEE; Young Chang KIM
- Web page: https://patentgrep.com/patent/US20210344033A1

## CPC

- H01M 10/0431: {Cells with wound or folded electrodes (H01M10/045 takes precedence)}
- H01M 4/134: Electrodes based on metals, Si or alloys
- H01M 10/0422: {Cells or battery with cylindrical casing}
- H01M 50/107: having curved cross-section, e.g. round or elliptic (H01M50/103, H01M50/109, H01M50/11 take precedence)
- H01M 50/152: for cells having curved cross-section, e.g. round or elliptic (H01M50/15, H01M50/153 take precedence)
- H01M 50/531: Electrode connections inside a battery casing
- H01M 50/533: characterised by the shape of the leads or tabs
- H01M 50/538: Connection of several leads or tabs of wound or folded electrode stacks
- H01M 50/545: formed by the casing of the cells (cup shaped terminals adapted for cells having curved cross-section H01M50/56)
- H01M 50/571: Methods or arrangements for affording protection against corrosion; Selection of materials therefor
- 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

An embodiment of the present invention relates to a secondary battery, and with respect to a technical problem to be resolved, provided is a secondary battery which has an electrode tab provided by forming a notch on a non-coated part of an electrode plate of an electrode assembly, and which can enable a current collecting plate to come into surface contact with the electrode tab. To this end, disclosed is a secondary battery comprising: an electrode assembly which comprises a first electrode plate coated with a first electrode active material and having a first non-coated part formed along an upper end thereof, a second electrode plate coated with a second electrode active material and having a second non-coated part formed along a lower end thereof, and a separator interposed between the first electrode plate and the second electrode plate, and which is wound in a jelly roll shape; a can for accommodating the electrode assembly; a cap assembly for sealing the can; a first current collecting plate electrically connected to the cap assembly by coming into contact with the first non-coated part; and a second current collecting plate electrically connected to the can by coming into contact with the second non-coated part, wherein the first non-coated part and/or the second non-coated part has a structure in which a plurality of isosceles trapezoidal electrode tabs are arranged to be adjacent to one another with notches formed at a specific angle (α) and at predetermined intervals from a start point thereof that is closest to a winding axis, and thus the first non-coated part and/or the second non-coated part are bent toward the winding axis.

## Claims

### Claim 1

A secondary battery comprising:
an electrode assembly which comprises a first electrode plate coated with a first electrode active material and having a first non-coated part formed along an upper end thereof, a second electrode plate coated with a second electrode active material and having a second non-coated part formed along a lower end thereof, and a separator interposed between the first electrode plate and the second electrode plate, and which is wound in a jelly roll shape;
a can for accommodating the electrode assembly;
a cap assembly for sealing the can;
a first current collecting plate electrically connected to the cap assembly by coming into contact with the first non-coated part; and
a second current collecting plate electrically connected to the can by coming into contact with the second non-coated part,
wherein the first non-coated part and/or the second non-coated part has a structure in which a plurality of isosceles trapezoidal electrode tabs are arranged to be adjacent to one another with notches formed at a specific angle (α) and at predetermined intervals from a start point thereof that is closest to a winding axis, and thus the first non-coated part and/or the second non-coated part are bent toward the winding axis.

### Claim 2 (depends on 1)

The secondary battery of claim 1, wherein a distance between a point at which an nth notch is formed and a start point satisfies the following equation:
c
n
=
r
0
⁢
n
⁢
⁢
α
+
t
4
⁢
π
⁢
(
n
⁢
⁢
α
)
2
wherein r0 is a radius of the start point around the winding axis, and t is an increment of the radius when winding by 360° is performed.

### Claim 3 (depends on 1)

The secondary battery of claim 1, wherein a length (ln) of the base of the nth electrode tab from the start point satisfies the following equation:
l
n
=
r
0
⁢
α
+
t
⁢
⁢
α
2
4
⁢
π
⁢
(
2
⁢
n
-
1
)
wherein r0 is a radius of the start point around the winding axis, and t is an increment of the radius when winding by 360° is performed.

### Claim 4 (depends on 1)

The secondary battery of claim 1, wherein an insulation layer is provided in at least one of regions between a part where the first electrode active material is coated and the first non-coated part, and between a part where the second electrode active material is coated and the second non-coated part.

### Claim 5 (depends on 4)

The secondary battery of claim 4, wherein the insulation layer is formed to have a uniform width along a longitudinal direction.