Battery

Patent metadata

Field	Value
Publication number	US-2024429451-A1
Application number	US-202418824202-A
Country	US
Kind code	A1
Filing date	Sep 4, 2024
Priority date	Mar 21, 2022
Publication date	Dec 26, 2024
Grant date	—

Abstract

A battery includes a battery cell, an electrolyte solution, and an aluminum-plastic film. The aluminum-plastic film includes an upper film and a lower film disposed opposite to each other, the upper film and the lower film are connected to form an accommodating cavity, and the battery cell and the electrolyte solution are disposed in the accommodating cavity; and the electrolyte solution includes a non-aqueous organic solvent, an additive, and a lithium salt, where the lithium salt includes lithium hexafluorophosphate and lithium bis(fluorosulfonyl)imide. In embodiments of the present disclosure, lithium hexafluorophosphate and lithium bis(fluorosulfonyl)imide are used as lithium sources. Lithium bis(fluorosulfonyl)imide does not react with water to generate hydrofluoric acid, which can effectively reduce a content of hydrofluoric acid and slow down aging of a packaging film, thereby prolonging a service life of a battery.

First claim

What is claimed is:

1 . A battery, comprising a battery cell, an electrolyte solution, and an aluminum-plastic film, wherein the aluminum-plastic film comprises an upper film and a lower film disposed opposite to each other, the upper film and the lower film are connected to form an accommodating cavity, and the battery cell and the electrolyte solution are disposed in the accommodating cavity; and
the electrolyte solution comprises a non-aqueous organic solvent, an additive, and a lithium salt, the lithium salt comprises lithium hexafluorophosphate and lithium bis(fluorosulfonyl)imide.

2 . The battery according to claim 1 , wherein a sealing edge is formed at a position at which the upper film and the lower film are connected, the sealing edge comprises a top sealing edge and a side sealing edge, and a relationship among a content of lithium hexafluorophosphate, a content of lithium bis(fluorosulfonyl)imide, a width of the top sealing edge, and a width of the side sealing edge is:

A
1

-

A
2

min
⁡
(

W
1

,

W
2

)

≤

x
1

,

wherein A 1 is a mass fraction of lithium hexafluorophosphate in the electrolyte solution, A 2 is a mass fraction of lithium bis(fluorosulfonyl)imide in the electrolyte solution, W 1 is the width of the top sealing edge, W 2 is the width of the side sealing edge, and x 1 is a constant not greater than 0.2.

3 . The battery according to claim 2 , wherein x 1 is a constant not greater than 0.05.

4 . The battery according to claim 2 , wherein a relationship among the width of the top sealing edge, the width of the side sealing edge, and a minimum sealing strength of the sealing edge is:

L
=

x
2

+

x
3

×

min
⁡
(

W
1

,

W
2

)

,

wherein L is the minimum sealing strength of the sealing edge, x 2 is 16.45, and x 3 is 14.12.

5 . The battery according to claim 2 , wherein a relationship among the content of lithium hexafluorophosphate, the content of lithium bis(fluorosulfonyl)imide, and a minimum sealing strength of the sealing edge is:

A
1

-

A
2

L

≤

x
4

,

wherein L is the minimum sealing strength of the sealing edge, and x 4 is a constant not greater than 0.006.

6 . The battery according to claim 5 , wherein x 4 is a constant not greater than 0.003.

7 . The battery according to claim 1 , wherein a relationship between a content of lithium hexafluorophosphate and a content of lithium bis(fluorosulfonyl)imide comprises:

A
1

+

A
2

≥

x
5

,

wherein A 1 is a mass fraction of lithium hexafluorophosphate in the electrolyte solution, A 2 is a mass fraction of lithium bis(fluorosulfonyl)imide in the electrolyte solution, and x 5 is 12%.

8 . The battery according to claim 1 , wherein a relationship between a content of lithium hexafluorophosphate and a content of lithium bis(fluorosulfonyl)imide comprises:

A
1

-

A
2

≤

x
6

,

wherein A 1 is a mass fraction of lithium hexafluorophosphate in the electrolyte solution, A 2 is a mass fraction of lithium bis(fluorosulfonyl)imide in the electrolyte solution, and x 6 is 17%.

9 . The battery according to claim 7 , wherein the relationship between the content of lithium hexafluorophosphate and the content of lithium bis(fluorosulfonyl)imide further comprises:

A
2

A
1

≥

x
7

,

wherein x 7 is 0.01.

10 . The battery according to claim 8 , wherein the relationship between the content of lithium hexafluorophosphate and the content of lithium bis(fluorosulfonyl)imide further comprises:

A
2

A
1

≥

x
7

,

wherein x 7 is 0.01.

11 . The battery according to claim 2 , wherein A 1 ranges from 0.1% to 30%, and A 2 ranges from 0.1% to 30%.

12 . The

Assignees

• Zhuhai Cosmx Battery Co Ltd

Inventors

• Wang Hai
• Wang Feng
• Li Suli
• Li Junyi

Classifications

• H01M10/052

  Li-accumulators · CPC title

• H01M50/124

  having a layered structure · CPC title

• H01M50/121

  Organic material · CPC title

• H01M50/105

  Pouches or flexible bags · CPC title

• H01M50/119

  Metals · CPC title