Terminal film for power storage device, and power storage device using same

Patent metadata

Field	Value
Publication number	US-2025096383-A1
Application number	US-202418969209-A
Country	US
Kind code	A1
Filing date	Dec 4, 2024
Priority date	Jun 7, 2022
Publication date	Mar 20, 2025
Grant date	—

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.

First claim

What is claimed is:

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.

2 . 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.

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

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.

5 . 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.

6 . 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.

7 . 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.

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

9 . 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

,

Assignees

• Toppan Holdings Inc

Inventors

• Nakanishi Shunsuke
• Muraki Takuya
• IMAMOTO Junya

Classifications

• H01M50/124

  having a layered structure · CPC title

• H01M50/562

  characterised by the material · CPC title

• H01M50/553

  Terminals adapted for prismatic, pouch or rectangular cells · CPC title

• H01M50/55

  on the same side of the cell · CPC title

• H01M50/121

  Organic material · CPC title