IP Library › Granted Patent US 12689090
Granted Patent B2
US 12689090 · App. 18/333,167 · Granted Jul 21, 2026

Pressure relief apparatus, battery cell, battery, and electrical device

Inventors: Wenlin Zhou (Ningde, CN); Kaihuan Yang (Ningde, CN); Ting Zheng (Ningde, CN); Quankun Li (Ningde, CN); Peng Wang (Ningde, CN); Mingguang Gu (Ningde, CN)
Assignee: CONTEMPORARY AMPEREX TECHNOLOGY (HONG KONG) LIMITED
H01M50/3425F16K17/403H01M50/147H01M50/15H01M50/249H01M2200/20H01M2220/20
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Quick Facts
Patent No.
US 12689090
App. No.
18/333,167
Granted
Jul 21, 2026
Kind
B2
Abstract

A pressure relief apparatus includes a pressure relief part having a first surface and a second surface opposite to each other in a thickness direction of the pressure relief part, and a plurality of stages of score grooves sequentially arranged on the pressure relief part in a direction from the first surface to the second surface. Of two adjacent stages of score grooves in the thickness direction, one stage of score groove that is farther from the first surface is arranged on a bottom surface of another stage of score groove that is closer to the first surface.

Claims (50)

1 . A pressure relief apparatus, comprising:

a pressure relief part having a first surface and a second surface opposite to each other in a thickness direction of the pressure relief part; and

a plurality of stages of score grooves sequentially arranged on the pressure relief part in a direction from the first surface to the second surface, wherein of two adjacent stages of score grooves in the thickness direction, one stage of score groove that is farther from the first surface is arranged on a bottom surface of another stage of score groove that is closer to the first surface;

wherein:

the plurality of stages of score grooves comprise a first-stage score groove, the first-stage score groove comprising a first groove segment, a second groove segment, a third groove segment, and a fourth groove segment,

the first groove segment and the second groove segment being oppositely arranged,

the first groove segment and the second groove segment both intersecting with the third groove segment,

the fourth groove segment being a rectilinear groove located between the first groove segment and the second groove segment, intersecting with the third groove segment, being parallel to the first groove segment and the second groove segment, and being perpendicular to the third groove segment;

the pressure relief part comprises an opening region, the first groove segment, the second groove segment, and the third groove segment being arranged along an edge of the opening region, and the opening region being configured to be openable with the first groove segment, the second groove segment, and the third groove segment as boundaries;

the second surface is provided with a notch groove only located within the opening region, and the notch groove is at a distance from the third groove segment in a direction of extension of the first groove segment; and the notch groove is at a distance from both the first groove segment and the second groove segment in a direction of extension of the third groove segment; and

the notch groove extends in the direction of extension of the third groove segment, and the notch groove is parallel to the third groove segment.

2 . The pressure relief apparatus according to claim 1 , wherein the first groove segment, the second groove segment, and the third groove segment form two opening regions, and each of the opening regions is provided with one notch groove.

3 . The pressure relief apparatus according to claim 1 , wherein a part of the pressure relief part located in the opening region can be turned over with a part of the pressure relief part located in the notch groove as an axis.

4 . The pressure relief apparatus according to claim 1 , wherein in the direction of extension of the third groove segment, a distance from the position of intersection of the fourth groove segment with the third groove segment to the first groove segment is equal to a distance from the position of intersection of the fourth groove segment with the third groove segment to the second groove segment.

5 . The pressure relief apparatus according to claim 1 , wherein the first groove segment, the second groove segment, and the third groove segment form at least one opening region.

6 . The pressure relief apparatus according to claim 1 , wherein the first groove segment, the second groove segment, and the third groove segment form two opening regions that are located on two sides of the third groove segment respectively.

7 . The pressure relief apparatus according to claim 1 , wherein the plurality of stages of score grooves comprise one stage of the first-stage score groove.

8 . The pressure relief apparatus according claim 1 , wherein the first-stage score groove comprise multiple stages of the first-stage score grooves sequentially arranged in the direction from the first surface to the second surface.

9 . The pressure relief apparatus according claim 1 , wherein the plurality of stages of score grooves further comprise at least one stage of a second-stage score groove, the at least one stage of the second-stage score groove and the first-stage score groove being sequentially arranged in the direction from the first surface to the second surface,

wherein the opening region is formed on a groove bottom wall of one stage of the second-stage score groove that is farthest from the first surface.

10 . The pressure relief apparatus according to claim 9 , wherein the plurality of stages of score grooves comprise one stage of the second-stage score groove, the second-stage score groove being arranged on the first surface.

11 . The pressure relief apparatus according claim 9 , wherein the at least one stage of the second-stage score groove comprise multiple stages of second-stage score grooves, the multiple stages of the second-stage score grooves being sequentially arranged in the direction from the first surface to the second surface, with an outermost stage of the multiple stages of the second-stage score grooves being arranged on the first surface.

12 . The pressure relief apparatus according claim 1 , wherein each stage of the plurality of stages of score grooves comprises at least one groove segment, and among two adjacent groove segments in the thickness direction, a maximum width of the groove segment furthest far from the first surface is less than a minimum width of the groove segment nearest to the first surface.

13 . The pressure relief apparatus according to claim 1 , wherein a distance H 0 between the first surface and the second surface and a distance H 1 between the second surface and a bottom surface of one stage of score groove that is nearest to the second surface satisfy the following condition: H 1 /H 0 <0.2.

14 . The pressure relief apparatus according to claim 1 , wherein a distance H 1 between the second surface and a bottom surface of one stage of score groove that is nearest to the second surface satisfies the following condition: H 1 <0.5 mm.

15 . The pressure relief apparatus according to claim 1 , wherein a depth H 2 of the stage of score groove that is arranged on the first surface satisfies the following condition: H 2 <1 mm.

16 . The pressure relief apparatus according to claim 1 , wherein a depth H 3 of each stage of score groove between the stage of score groove nearest to the second surface and the stage of score groove arranged on the first surface satisfies the following condition: H 3 <1.5 mm.

17 . The pressure relief apparatus according to claim 1 , wherein:

the notch groove is located between the third groove segment and an end of the first groove segment extending in a direction perpendicular to the third groove segment and an end of the second groove segment extending in a direction perpendicular to the third groove segment.

18 . A pressure relief apparatus, comprising:

a pressure relief part having a first surface and a second surface opposite to each other in a thickness direction of the pressure relief part; and

a plurality of stages of score grooves sequentially arranged on the pressure relief part in a direction from the first surface to the second surface, wherein of two adjacent stages of score grooves in the thickness direction, one stage of score groove that is farther from the first surface is arranged on a bottom surface of another stage of score groove that is closer to the first surface;

wherein:

the plurality of stages of score grooves comprise a first-stage score groove, the first-stage score groove comprising a first groove segment, a second groove segment, a third groove segment, and a fourth groove segment,

the first groove segment and the second groove segment being oppositely arranged,

the first groove segment and the second groove segment both intersecting with the third groove segment,

the fourth groove segment being a rectilinear groove located between the first groove segment and the second groove segment, intersecting with the third groove segment, being parallel to the first groove segment and the second groove segment, and being perpendicular to the third groove segment;

the pressure relief part comprises an opening region, the first groove segment, the second groove segment, and the third groove segment being arranged along an edge of

the opening region, and the opening region being configured to be openable with the first groove segment, the second groove segment, and the third groove segment as boundaries; the second surface is provided with a notch groove only located within the opening region, and the notch groove is at a distance from the third groove segment in a direction of extension of the first groove segment; and

the notch groove is at a distance from both the first groove segment section and the second groove segment section in a direction of extension of the third groove segment; and

the notch groove is located between the third groove segment and an end of the first groove segment extending in a direction perpendicular to the third groove segment and an end of the second groove segment extending in the direction perpendicular to the third groove segment.

19 . A pressure relief apparatus, comprising:

a pressure relief part having a first surface and a second surface opposite to each other in a thickness direction of the pressure relief part; and

a plurality of stages of score grooves sequentially arranged on the pressure relief part in a direction from the first surface to the second surface, wherein of two adjacent stages of score grooves in the thickness direction, one stage of score groove that is farther from the first surface is arranged on a bottom surface of another stage of score groove that is closer to the first surface;

wherein:

the plurality of stages of score grooves comprise a first-stage score groove, the first-stage score groove comprising a first groove segment, a second groove segment, a third groove segment, and a fourth groove segment, the first groove segment and the second groove segment being oppositely arranged, the first groove segment and the second groove segment both intersecting with the third groove segment, and the fourth groove segment being located between the first groove segment and the second groove segment, and intersecting with the third groove segment;

the pressure relief part comprises an opening region, the first groove segment, the second groove segment, and the third groove segment being arranged along an edge of the opening region, and the opening region being configured to be openable with the first groove segment, the second groove segment, and the third groove segment as boundaries;

the second surface is provided with only one notch groove only located within the opening region, and the only one notch groove is at a distance from the third groove segment in a direction of extension of the first groove segment; and the only one notch groove is at a distance from both the first groove segment and the second groove segment in a direction of extension of the third groove segment; and the only one notch groove is a rectilinear groove extending in the direction of extension of the third groove segment, and

the only one notch groove is parallel to the third groove segment and perpendicular to the fourth groove segment.

20 . The pressure relief apparatus according to claim 19 , wherein the fourth groove segment is parallel to the first groove segment and the second groove segment, and is perpendicular to the third groove segment.