# US 2026/0066489 A1 · Electrode Lead Structure for Secondary Battery and Lithium Secondary Battery Including the Same

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- Number: US 2026/0066489 A1
- Document ID: US20260066489A1
- Status: Published application
- Kind: A1
- Application number: 19/313,942
- Filed: 2025-08-29
- Published: 2026-03-05
- Earliest claimed: 2024-08-30
- Assignees: SK On Co., Ltd.
- Applicants: SK On Co., Ltd.
- Inventors: Ga Yeong YOO; Young Ha KIM; Ho Jin HWANG
- Web page: https://patentgrep.com/patent/US20260066489A1

## CPC

- H01M 50/533: characterised by the shape of the leads or tabs
- H01M 50/178: for pouch or flexible bag cells
- H01M 50/534: characterised by the material of the leads or tabs
- H01M 50/536: characterised by the method of fixing the leads to the electrodes, e.g. by welding
- H01M 50/54: Connection of several leads or tabs of plate-like electrode stacks, e.g. electrode pole straps or bridges
- H01M 50/548: on opposite sides of the cell
- H01M 50/557: Plate-shaped terminals
- Y02E 60/10: Energy storage using batteries
- 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

## Abstract

Provided are an electrode lead structure for a secondary battery and a secondary battery including the same. The electrode lead structure includes an electrode lead and a lead film, wherein the electrode lead includes a first lead portion to which an electrode tab is bonded, a second lead portion, having a thickness less than that of the first lead portion, and a third lead portion formed between the first lead portion and the second lead portion and having a slope in which a thickness increases in a direction from the second lead portion to the first lead portion, and the lead film is positioned on the third lead portion.

## Claims

### Claim 1

An electrode lead structure for a secondary battery, the electrode lead structure comprising:
an electrode lead and a lead film,
wherein the electrode lead includes a first lead portion to which an electrode tab is bonded; a second lead portion, having a thickness less than that of the first lead portion; and a third lead portion formed between the first lead portion and the second lead portion and having a slope in which a thickness increases in a direction from the second lead portion to the first lead portion, and
the lead film is positioned on the third lead portion.

### Claim 2 (depends on 1)

The electrode lead structure of claim 1, wherein the first lead portion is less than a thickness of an electrode assembly.

### Claim 3 (depends on 1)

The electrode lead structure of claim 1, wherein the thickness of the second lead portion is 200 μm to 1.2 mm.

### Claim 4 (depends on 1)

The electrode lead structure of claim 1, wherein the electrode lead is a negative electrode lead, and the thickness of the second lead portion is 200 μm to 600 μm.

### Claim 5 (depends on 1)

The electrode lead structure of claim 1, wherein the electrode lead is a positive electrode lead, and the thickness of the second lead portion is 200 μm to 1 mm.

### Claim 6 (depends on 1)

The electrode lead structure of claim 1, wherein a thickness ratio of the first lead portion and the second lead portion is 1.1 to 3:1.

### Claim 7 (depends on 1)

The electrode lead structure of claim 1, wherein a width of the third lead portion is greater than a width of the lead film.

### Claim 8 (depends on 1)

The electrode lead structure of claim 1, wherein a width of the third lead portion is 10 to 30% greater than a width of the lead film.

### Claim 9 (depends on 1)

The electrode lead structure of claim 1, wherein the slope of the third lead portion is formed only on one surface of the electrode lead.

### Claim 10 (depends on 1)

The electrode lead structure of claim 1, wherein the slope of the third lead portion is formed on both surfaces of the electrode lead.

### Claim 11 (depends on 10)

The electrode lead structure of claim 10, wherein, in the slope formed on both surfaces, slope angles between the first lead portion and the second lead portion are different from each other.

### Claim 12 (depends on 1)

A secondary battery comprising:
an electrode assembly;
an electrode tab disposed at at least one end portion of the electrode assembly; and
an electrode lead structure bonded to the electrode tab,
wherein the electrode lead structure is the electrode lead structure of claim 1.

### Claim 13 (depends on 12)

The secondary battery of claim 12, wherein the electrode tab is bonded to one or both surfaces of the first lead portion of the electrode lead structure.

### Claim 14 (depends on 12)

The secondary battery of claim 12, wherein the secondary battery is a lithium secondary battery.