Battery cell and electric apparatus

Patent metadata

Field	Value
Publication number	US-2024250376-A1
Application number	US-202418621371-A
Country	US
Kind code	A1
Filing date	Mar 29, 2024
Priority date	Dec 31, 2022
Publication date	Jul 25, 2024
Grant date	—

Abstract

A battery cell includes a housing and a pressure relief mechanism. The housing is provided with a first through hole and the pressure relief mechanism covers the first through hole. The pressure relief mechanism includes an adhesive film, and the adhesive film can be heated and melted to form a pressure relief channel connecting the inside and outside of the housing. The pressure relief mechanism has good thermal sensitivity, allowing for highly reliable pressure relief, thus improving the safety of the battery cell. In addition, as compared with the pressure relief mechanism with engraved grooves, no large space needs to be reserved in some embodiments, allowing for a more compacted structure of the electric apparatus and lower preparation costs of the pressure relief mechanism.

First claim

What is claimed is:

1 . A battery cell, comprising:
a housing, wherein the housing is provided with a first through hole; and a pressure relief mechanism covering the first through hole; wherein the pressure relief mechanism comprises an adhesive film, a first metal sheet, and a second metal sheet; the adhesive film is configured to be heated and melted to form a pressure relief channel connecting the inside and outside of the housing; the first metal sheet being disposed on a side of the adhesive film facing away from the housing; the second metal sheet is disposed between the adhesive film and the housing, the second metal sheet is welded to the housing, and the second metal sheet is provided with a second through hole.

2 . The battery cell according to claim 1 , wherein the first through hole is an electrolyte injection hole.

3 . The battery cell according to claim 1 , wherein the housing comprises a bottom wall and a plurality of side walls surrounding the bottom wall; the battery cell further comprises a pole, and the pole and the first through hole are provided on one of the plurality of side walls.

4 . The battery cell according to claim 1 , wherein the adhesive film is attached to the housing, a portion of the adhesive film attached to the housing has a width of W, and 0.2 mm≤W≤2 mm.

5 . The battery cell according to claim 4 , wherein 0.3 mm≤W≤1 mm.

6 . The battery cell according to claim 1 , wherein the first metal sheet is circular, and the adhesive film is circular or annular.

7 . The battery cell according to claim 1 , wherein the first through hole is circular, a diameter of the first metal sheet is smaller than or equal to an outer diameter of the adhesive film, and the diameter of the first metal sheet is greater than a diameter of the first through hole.

8 . The battery cell according to claim 6 , wherein the adhesive film comprises a first adhesive layer and a second adhesive layer, wherein the first adhesive layer and the second adhesive layer are stacked, the second adhesive layer is located on a side of the first adhesive layer facing away from the housing, and a melting point of the first adhesive layer is lower than a melting point of the second adhesive layer.

9 . The battery cell according to claim 8 , wherein the melting point of the first adhesive layer is T1 and 100° C.≤T1≤130° C.

10 . The battery cell according to claim 9 , wherein 110° C.≤T1≤125° C.

11 . The battery cell according to claim 8 , wherein the melting point of the second adhesive layer is T2 and 140° C.≤T2≤190° C.

12 . The battery cell according to claim 11 , wherein 150° C.≤T2≤170° C.

13 . The battery cell according to claim 9 , wherein the adhesive film further comprises a third adhesive layer, the third adhesive layer is located between the second adhesive layer and the first metal sheet, and a melting point of the third adhesive layer is lower than the melting point of the second adhesive layer.

14 . The battery cell according to claim 13 , wherein the melting point of the third adhesive layer is T3 and 100° C.≤T3≤130° C.

15 . The battery cell according to claim 14 , wherein 110° C.≤T3≤125° C.

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

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

18 . The battery cell according to claim 17 , wherein a thickness ratio of the first adhesive layer, the second adhesive layer, and the third adhesive layer is 1:0.5:1 to 1:3:1.

19 . The battery cell according to claim 1 , wherein the first through hole is circular, the first through hole has a diameter of D, and 0.5 mm≤D≤2 mm.

20 . The battery cell according to claim 19 , wherein 0.9 mm≤D≤1.6 mm.

21 . A pressure relief mechanism, wherein the pressure relief mechanism comprises:
an adhesive film; a first metal sheet disposed on a side of the adhesive film; and a second metal sheet disposed on a side of the adhesive film facing away from the first metal sheet; wherein the pressure relief mechanism is configured to relieve pressure of a battery cell; wherein a melting point of the adhesive film is 100° C.-130° C.

22 . The pressure relief mechanism according to claim 21 , wherein the adhesive film comprises a first adhesive layer and a second adhesive layer, wherein the first adhesive layer and the second adhesive layer are stacked, the second adhesive layer is located on a side of the first adhesive layer back away from the housing, and a melting point of the first adhesive layer is lower than a melting point of the second adhesive layer.

23 . The pressure relief mechanism according to claim 22 , wherein the adhesive film further comprises a third adhesive layer, wherein the third adhesive layer is located between the second adhesive layer and the first metal sheet, and a melting point of the third adhesive layer is lower than the melting point of the second adhesive layer.

24 . The pressure relief mechanism according to claim 23 , wherein the first adhesive layer, the second adhesive layer, and the third adhesive layer satisfy at least one of the following conditions:
(1) the melting point of the first adhesive layer is T1 satisfying 100° C.≤T1≤130° C.; (2) the melting point of the second adhesive layer is T2 satisfying 140° C.≤T2≤190° C.; or (3) the melting point of the third adhesive layer is T3 satisfying 100° C.≤T3≤130° C.

25 . An electric apparatus, comprising the battery cell according to claim 1 , wherein the battery cell is configured to supply electric energy.

Assignees

• Ningde Amperex Technology Ltd

Inventors

• Zhang Guowen

Classifications

• H01M10/054

  Accumulators with insertion or intercalation of metals other than lithium, e.g. with magnesium or aluminium · CPC title

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• H01M50/3425 Primary

  in the form of rupturable membranes or weakened parts, e.g. pierced with the aid of a sharp member · CPC title

• H01M50/636

  Closing or sealing filling ports, e.g. using lids · CPC title

• H01M50/375 Primary

  Vent means sensitive to or responsive to temperature · CPC title