# US 2026/0094875 A1 · Secondary battery

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- Number: US 2026/0094875 A1
- Document ID: US20260094875A1
- Status: Published application
- Kind: A1
- Application number: 19/346,576
- Filed: 2025-10-01
- Published: 2026-04-02
- Earliest claimed: 2024-10-02
- Assignees: SK On Co., Ltd.
- Applicants: SK On Co., Ltd.
- Inventors: Seung Min LEE
- Web page: https://patentgrep.com/patent/US20260094875A1

## CPC

- H01M 10/0585: of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators
- H01M 10/052: Li-accumulators
- H01M 50/461: {with adhesive layers between electrodes and separators}
- H01M 50/586: inside the batteries, e.g. incorrect connections of electrodes
- H01M 50/59: characterised by the protection means
- 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 including a separator and electrodes repeatedly stacked with the separator interposed therebetween, and a support structure covering a side surface in a length direction of the electrode assembly and contacting end portions of the separator. Contraction of the separator and short-circuit of the electrodes are prevented by the support structure.

## Claims

### Claim 1

A secondary battery, comprising:
an electrode assembly comprising a separator and electrodes repeatedly stacked with the separator interposed therebetween; and
a support structure covering a side surface in a length direction of the electrode assembly and contacting end portions of the separator.

### Claim 2 (depends on 1)

The secondary battery of claim 1, wherein the support structure includes an adhesive resin material.

### Claim 3 (depends on 1)

The secondary battery of claim 1, wherein the support structure comprises insertion portions inserted into spaces between the end portions of the separator adjacent in a thickness direction, and an extension portion extending in the thickness direction and connecting the insertion portions.

### Claim 4 (depends on 3)

The secondary battery of claim 3, wherein the insertion portions are in contact with the electrodes.

### Claim 5 (depends on 3)

The secondary battery of claim 3, wherein the electrodes comprise a cathode and an anode,
the insertion portions are in contact with the anode and are spaced apart from the cathode in the length direction.

### Claim 6 (depends on 5)

The secondary battery of claim 5, wherein a gap space extending in a width direction of the electrode assembly is formed between the insertion portion and the cathode.

### Claim 7 (depends on 1)

The secondary battery of claim 1, wherein the electrodes comprise cathodes and anodes,
each of the cathodes comprises a cathode tab, and each of the anodes comprises an anode tab, and
the cathode tabs and the anode tabs protrude through the support structure.

### Claim 8 (depends on 7)

The secondary battery of claim 7, wherein the support structure comprises:
a first support structure through which the anode tabs extend, the first structure being combined with one end portion of the electrode assembly in the length direction; and
a second support structure through which the cathode tabs extend, the second support structure being combined with the other end portion of the electrode assembly in the length direction.

### Claim 9 (depends on 1)

The secondary battery of claim 1, wherein the support structure also covers a side surface of the electrode assembly in a width direction.

### Claim 10

A secondary battery, comprising:
an electrode assembly comprising a separator and electrodes repeatedly stacked with the separator interposed therebetween; and
a support structure covering a top surface and a bottom surface of the electrode assembly in a thickness direction and contacting end portions of the separator in a length direction of the electrode assembly.

### Claim 11 (depends on 10)

The secondary battery of claim 10, wherein the top and bottom surfaces of the electrode assembly are defined by an outermost separator among the separator of the electrode assembly.

### Claim 12 (depends on 11)

The secondary battery of claim 11, wherein the support structure contacts the top and bottom surfaces of the electrode assembly.

### Claim 13 (depends on 10)

The secondary battery of claim 10, wherein the support structure extends in the thickness direction and commonly contacts the end portions of the separator at different levels.

### Claim 14 (depends on 10)

The secondary battery of claim 10, wherein the support structure comprises insertion portions inserted into spaces between the end portions of the separator.

### Claim 15 (depends on 10)

The secondary battery of claim 10, wherein the electrodes comprise electrode tabs protruding in the length direction, and
the support structure extends in a width direction of the electrode assembly between the electrode tabs adjacent to each other.