# US 2025/0096383 A1 · Terminal film for power storage device, and power storage device using same

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

- Number: US 2025/0096383 A1
- Document ID: US20250096383A1
- Status: Published application
- Kind: A1
- Application number: 18/969,209
- Filed: 2024-12-04
- Published: 2025-03-20
- Earliest claimed: 2022-06-07
- Assignees: Toppan Holdings Inc.
- Applicants: Toppan Holdings Inc.
- Inventors: Shunsuke NAKANISHI; Takuya MURAKI; Junya IMAMOTO
- Web page: https://patentgrep.com/patent/US20250096383A1

## CPC

- H01M 50/193: Organic material
- H01M 50/121: Organic material
- H01M 50/124: having a layered structure
- H01M 50/131: characterised by physical properties, e.g. gas permeability, size or heat resistance
- H01M 50/178: for pouch or flexible bag cells
- H01M 50/184: characterised by their shape or structure
- H01M 50/197: having a layered structure
- H01M 50/55: on the same side of the cell
- H01M 50/553: Terminals adapted for prismatic, pouch or rectangular cells
- H01M 50/562: characterised by the material
- H01M 50/105: Pouches or flexible bags
- 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

A power storage device terminal film for covering an outer peripheral surface of part of a metal terminal constituting a power storage device, the power storage device terminal film containing polypropylene and polyethylene, wherein the terminal film has a first surface satisfying Formula (A1): 0.3≤a2/a1≤6.2(A1), where a1 represents an absorption intensity at a wave number of 720 cm−1 measured by attenuated total reflection infrared spectroscopy, and a2 represents an absorption intensity at a wave number of 841 cm−1 measured by attenuated total reflection infrared spectroscopy.

## Claims

### Claim 1

A power storage device terminal film for covering an outer peripheral surface of part of a metal terminal constituting a power storage device, the power storage device terminal film, comprising:
polypropylene and polyethylene, wherein
the terminal film has a first surface satisfying Formula (A1):
0.3
≤
a
⁢
2
/
a
⁢
1
≤
6.2
,
(
A
⁢
1
)
where a1 represents an absorption intensity at a wave number of 720 cm−1 measured by attenuated total reflection infrared spectroscopy, and a2 represents an absorption intensity at a wave number of 841 cm−1 measured by attenuated total reflection infrared spectroscopy.

### Claim 2 (depends on 1)

The power storage device terminal film of claim 1, comprising
a compatibilizer that has a portion compatible with the polypropylene and a portion compatible with the polyethylene.

### Claim 3 (depends on 2)

The power storage device terminal film of claim 2, wherein
the compatibilizer is a block copolymer or a graft copolymer.

### Claim 4

A power storage device terminal film for covering an outer peripheral surface of part of a metal terminal constituting a power storage device, the power storage device terminal film, comprising:
a first resin layer that contains polypropylene and polyethylene;
a second resin layer that contains polypropylene; and
an intermediate layer that contains polypropylene and is provided between the first resin layer and the second resin layer, wherein
the first resin layer has, as one surface of the terminal film, a first surface satisfying Formula (A1):
0.3
≤
a
⁢
2
/
a
⁢
1
≤
6.2
,
(
A
⁢
1
)
where a1 represents an absorption intensity at a wave number of 720 cm−1 measured by attenuated total reflection infrared spectroscopy, and a2 represents an absorption intensity at a wave number of 841 cm−1 measured by attenuated total reflection infrared spectroscopy.

### Claim 5 (depends on 4)

The power storage device terminal film of claim 4, wherein
the intermediate layer satisfies Formula (B1):
1.
0
≤
b
⁢
2
/
b
⁢
1
≤
3.2
,
(
B
⁢
1
)
where b1 represents an absorption intensity at a wave number of 720 cm−1 measured by attenuated total reflection infrared spectroscopy, and b2 represents an absorption intensity at a wave number of 841 cm−1 measured by attenuated total reflection infrared spectroscopy.

### Claim 6 (depends on 4)

The power storage device terminal film of claim 4, wherein
the second resin layer satisfies Formula (C1):
1.
0
≤
c
⁢
2
/
c
⁢
1
≤
5.8
,
(
C
⁢
1
)
where c1 represents an absorption intensity at a wave number of 720 cm−1 measured by attenuated total reflection infrared spectroscopy, and c2 represents an absorption intensity at a wave number of 841 cm−1 measured by attenuated total reflection infrared spectroscopy.

### Claim 7 (depends on 4)

The power storage device terminal film of claim 4, wherein
the first resin layer contains a compatibilizer that has a portion compatible with the polypropylene and a portion compatible with the polyethylene.

### Claim 8 (depends on 7)

The power storage device terminal film of claim 7, wherein
the compatibilizer is a block copolymer or a graft copolymer.

### Claim 9 (depends on 1)

A power storage device, comprising:
a power storage device body;
a metal terminal that is electrically connected to the power storage device body;
a packaging material that holds the metal terminal and houses the power storage device body; and
the power storage device terminal film of claim 1 that is disposed between the metal terminal and the packaging material so as to cover an outer peripheral surface of part of the metal terminal, wherein
the packaging material includes a sealant layer that contains polypropylene,
the terminal film is disposed so that the first surface is in contact with the sealant layer, and
the sealant layer satisfies Formula (D1):
0.8
≤
d
⁢
2
/
d
⁢
1
≤
8.5
,
(
D
⁢
1
)
where d1 represents an absorption intensity at a wave number of 720 cm−1 measured by attenuated total reflection infrared spectroscopy, and d2 represents an absorption intensity at a wave number of 841 cm−1 measured by attenuated total reflection infrared spectroscopy.