Battery cell and electrical device

Patent metadata

Field	Value
Publication number	US-2025329896-A1
Application number	US-202519254830-A
Country	US
Kind code	A1
Filing date	Jun 30, 2025
Priority date	Dec 31, 2022
Publication date	Oct 23, 2025
Grant date	—

Abstract

A battery cell includes a housing, an electrode post, and a pressure relief mechanism. The housing includes a bottom wall and a plurality of sidewalls disposed around the bottom wall. A first through-hole and a second through-hole are created on a first sidewall of the plurality of sidewalls. The electrode post is threaded through the first through-hole. A pressure relief mechanism covers the second through-hole. The pressure relief mechanism includes a adhesive film. The adhesive film is able to melt when a temperature of the battery cell reaches a threshold, so as to release pressure inside the housing through the second through-hole.

First claim

What is claimed is:

1 . A battery cell, comprising:
a housing, comprising a bottom wall and a plurality of sidewalls disposed around the bottom wall, wherein a first through-hole and a second through-hole are provided on a first sidewall of the plurality of sidewalls; an electrode post, threaded through the first through-hole; and a pressure relief mechanism, covering the second through-hole, wherein the pressure relief mechanism comprises an adhesive film, and the adhesive film is configured to melt when a temperature of the battery cell reaches a threshold, so as to release pressure inside the housing through the second through-hole.

2 . The battery cell according to claim 1 , wherein, the battery cell further comprises a first insulator, the first insulator is disposed on an inner side of the first sidewall, the first insulator is connected to the electrode post, and a channel connecting an inner space of the housing and the pressure relief mechanism is created on the first insulator.

3 . The battery cell according to claim 2 , wherein, the channel is a groove created on a side of the first insulator, the side being oriented toward the first sidewall, and at least one end of the groove extending to an edge of the first insulator.

4 . The battery cell according to claim 3 , wherein, the groove runs through the first insulator along a width direction of the first insulator.

5 . The battery cell according to claim 3 , wherein a depth of the groove is A, and

0.05

mm

≤
A
≤

0.5

mm
.

,

6 . The battery cell according to claim 5 , wherein 0.1 mm≤A≤0.2 mm.

7 . The battery cell according to claim 3 , wherein, a diameter of the second through-hole is B, a width of the groove is C, and 0.8×B≤C.

8 . The battery cell according to claim 7 , wherein, B≤C≤2×B.

9 . The battery cell according to claim 2 , wherein, the battery cell further comprises an electrode assembly and an interconnect component, both the electrode assembly and the interconnect component are disposed in the housing, the interconnect component is configured to electrically connect the electrode assembly and the electrode post, and the first insulator is located between the first sidewall and the interconnect component; and
a third through-hole is provided in the first insulator, a fourth through-hole is provided in the interconnect component, and the electrode post is threaded through the third through-hole and the fourth through-hole and riveted to the interconnect component.

10 . The battery cell according to claim 9 , wherein, the battery cell further comprises a second insulator, at least a part of the second insulator is located on an outer side of the first sidewall, a fifth through-hole is created in the second insulator, and the electrode post is threaded through the fifth through-hole.

11 . The battery cell according to claim 1 , wherein, the adhesive film comprises a first adhesive segment and a second adhesive segment connected to each other, the first adhesive segment is located on an outer side of the first sidewall, and at least a part of the second adhesive segment is located in the second through-hole.

12 . The battery cell according to claim 11 , wherein, the adhesive film further comprises a third adhesive segment connected to the second adhesive segment at a side away from the first adhesive segment, and the third adhesive segment is disposed on an inner side of the first sidewall.

13 . The battery cell according to claim 1 , wherein, a melting point of the adhesive film is T, and 100° C.≤T≤190° C.

14 . The battery cell according to claim 13 , wherein, 100° C.≤T≤130° C.

15 . The battery cell according to claim 1 , wherein, a thickness of the adhesive film is H, and 0.05 mm≤H≤0.5 mm.

16 . The battery cell according to claim 15 , wherein, 0.1 mm≤H≤0.3 mm.

17 . The battery cell according to claim 1 , wherein, the second through-hole is in a circular shape, and a diameter of the second through-hole is B, and 0.5 mm≤B≤3 mm.

18 . The battery cell according to claim 17 , wherein 0.9 mm≤B≤1.6 mm.

19 . The battery cell according to claim 1 , wherein, a width of the adhesive film at a part of the adhesive film bonded to the first sidewall is W, and 0.2 mm≤W≤2 mm.

20 . The battery cell according to claim 1 , wherein, the pressure relief mechanism further comprises a metal sheet, the metal sheet and the adhesive film are stacked, and the metal sheet is located on a side of the adhesive film, the side being oriented away from the first sidewall.

21 . A pressure relief mechanism, wherein, the pressure relief mechanism comprises:
an adhesive film; and a first metal sheet, disposed on one side of the adhesive film and bonded to the adhesive film, wherein the pressure relief mechanism is configured to release pressure of a battery cell.

22 . The pressure relief mechanism according to claim 21 , wherein, the pressure relief mechanism further comprises a second metal sheet, and the second metal sheet is disposed on a side of the adhesive film, the side being oriented back from the first metal sheet.

23 . The pressure relief mechanism according to claim 22 , wherein a melting point of the adhesive film is 100° C. to 130° C.

24 . The pressure relief mechanism according to claim 23 , wherein, the adhesive film comprises a first gel layer and a second gel layer, the first gel layer and the second gel layer are stacked, and the second gel layer is located on a side of the first gel layer, the side being oriented back from a housing, and a melting point of the first gel layer is lower than a melting point of the second gel layer.

25 . The pressure relief mechanism according to claim 24 , wherein, the adhesive film further comprises a third gel layer, the third gel layer is located between the second gel layer and the first metal sheet, and a melting point of the third gel layer is lower than the melting point of the second gel layer.

26 . The pressure relief mechanism according to claim 25 , wherein, the first gel layer, the second gel layer, and the third gel layer satisfy at least one of the following conditions:
(1) the melting point of the first gel layer is T 1 , satisfying: 100° C.≤T 1 ≤130° C.; (2) the melting point of the second gel layer is T 2 , satisfying: 140° C.≤T 2 ≤190° C.; and (3) the melting point of the third gel layer is T 3 , satisfying: 100° C.≤T 3 ≤130° C.

27 . An electrical device, wherein, the electrical device comprises the battery cell according to claim 1 , and the battery cell is configured to provide electrical energy.

Assignees

• Ningde Amperex Technology Ltd

Inventors

• Zhang Guowen

Classifications

• H01M50/593

  Spacers; Insulating plates · CPC title

• H01M50/342

  Non-re-sealable arrangements · CPC title

• H01M50/103 Primary

  prismatic or rectangular (H01M50/109, H01M50/11 take precedence) · CPC title

• H01M50/503

  characterised by the shape of the interconnectors · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title