KR-102964640-B1 - Pressure reducing mechanism, battery cell, battery, electric device and method of manufacturing the same

Abstract

Embodiments of the present application provide a pressure reducing mechanism, a battery cell, a battery, an electric device, and a method for manufacturing the same. The pressure reducing mechanism is installed on a housing plate of a battery cell and comprises: a connecting portion located in an outer circumferential region of the pressure reducing mechanism and connected to the housing plate; a first portion having one end connected to the connecting portion and the other end extending obliquely toward the interior of the battery cell; a weak portion connected to the extended end of the first portion; and a second portion having a shape protruding toward the interior of the battery cell and having an outer edge region connected to the weak portion; wherein when the internal temperature or pressure of the battery cell is less than a first preset value, the weak portion is pressurized by the first portion and/or the second portion. The technical solution of the embodiment of the present application can effectively extend the lifespan of the pressure reducing mechanism.

Inventors

• 후앙, 쇼우준
• 쩡, 위리안
• 왕, 펑
• 첸, 신샹
• 류, 옌위

Assignees

• 컨템포러리 엠퍼렉스 테크놀로지 (홍콩) 리미티드

Dates

Publication Date

20260512

Application Date

20210929

Claims (20)

1. In a pressure reducing mechanism installed on a housing plate of a battery cell, A connecting part located in the outer periphery of the above-mentioned pressure reduction mechanism and connected to the housing plate; A first part having one end connected to the above-mentioned connecting part and the other end extending obliquely toward the inside of the battery cell; A vulnerable part connected to the extended end of the first part; and A second part having a shape protruding toward the interior of the battery cell and having an outer edge region connected to the vulnerable part; The above vulnerable part is located closer to the inside of the battery cell than the first part, and the second part is located closer to the inside of the battery cell than the vulnerable part, When the internal temperature or pressure of the battery cell is less than a first preset value, the vulnerable part is pressurized by the second part, and A pressure reduction mechanism in which, when the internal temperature or pressure of the battery cell is greater than or equal to the first preset value, the second part changes from a shape protruding toward the inside of the battery cell to a shape protruding toward a direction away from the inside of the battery cell, and the weak part is tensioned by at least one of the second part and the first part.
2. delete
3. In Article 1, A pressure reduction mechanism in which the thickness of the first part is greater than or equal to the thickness of the second part.
4. In Article 1, A pressure reduction mechanism that, when the internal temperature or pressure of the battery cell is greater than or equal to a second preset value, the vulnerable part operates to release the internal pressure of the battery cell through the pressure reduction mechanism.
5. In Article 1, The above second portion further comprises an intermediate portion connected to the outer edge region and approximately parallel to the portion of the housing plate where the pressure reduction mechanism is installed.
6. In Article 1, A pressure reduction mechanism having a thin wall region in the second part above.
7. In Article 1, A pressure relief mechanism in which a reinforcing structure is provided in the first part above.
8. In Article 7, The above-mentioned reinforcing structure is a pressure relief mechanism comprising a reinforcing rib protruding and provided on one side of the first part.
9. In Article 8, The above-mentioned reinforcing structure further comprises a concave portion provided on the other side of the first portion and located at a position corresponding to the reinforcing rib, a pressure relief mechanism.
10. In Article 8, A pressure relief mechanism, wherein the connecting portion is annular in shape and includes two straight portions and two arc-shaped portions connected to the ends of the two straight portions, and the reinforcing structure is located in the first portion corresponding to the straight portions.
11. In Article 1, The above-mentioned vulnerable part is a pressure relief mechanism in which the thickness of at least some area is less than the thickness of the first and second parts.
12. In Article 1, The above-mentioned vulnerable part is a groove, a pressure relief mechanism.
13. In Article 1, A pressure reduction mechanism in which, when the internal temperature or pressure of the battery cell is less than a first preset value, the vulnerable part is pressurized by the first part and the second part.
14. A battery cell comprising a pressure reduction mechanism according to any one of claims 1 and 3 to 13.
15. A battery comprising a battery cell according to claim 14.
16. An electric device comprising a battery according to claim 15 for providing electric energy.
17. A step of providing a connection portion to be installed in the outer circumference of a pressure reducing mechanism to be connected to a housing plate; A step of providing a first part such that one end is connected to the above-mentioned connecting part and the other end extends obliquely toward the inside of the battery cell; A step of providing a vulnerable portion to be connected to the extended end of the first portion; and The method includes the step of providing a second portion having a shape protruding toward the interior of the battery cell, such that the outer edge region is connected to the vulnerable portion; The above vulnerable part is located closer to the inside of the battery cell than the first part, and the second part is located closer to the inside of the battery cell than the vulnerable part, When the internal temperature or pressure of the battery cell is less than a first preset value, the vulnerable part is pressurized by the second part, and A method for manufacturing a pressure reduction mechanism, characterized in that when the internal temperature or pressure of the battery cell is greater than or equal to the first preset value, the second part changes from a shape protruding toward the inside of the battery cell to a shape protruding toward a direction away from the inside of the battery cell, and the weak part is tensioned by at least one of the second part and the first part.
18. In Article 17, A manufacturing method configured such that the thickness of the first part is greater than or equal to the thickness of the second part.
19. In Article 17, A manufacturing method in which a thin wall region is provided in the second part to facilitate deformation of the second part.
20. In Article 17, A manufacturing method in which, when the internal temperature or pressure of the battery cell is less than a first preset value, the vulnerable part is pressurized by the first part and the second part.

Description

Pressure reducing mechanism, battery cell, battery, electric device and method of manufacturing the same The present application relates to the field of batteries, specifically to a pressure reducing mechanism, a battery cell, a battery, an electric device, and a method for manufacturing the same. In cases of overcharging, puncture of the electrode plates by metal conductors, or hot box testing, heat and gas rapidly accumulate inside the battery, causing the internal pressure to rise, which in severe cases can lead to the expansion and explosion of the battery. Therefore, batteries are generally equipped with a pressure relief mechanism. When the internal pressure or temperature of the battery rises above a certain level, the pressure relief mechanism opens in time, allowing the internal gas to be discharged through it, thereby preventing the battery from exploding. In existing technology, even if the battery is in a normal operating state and the internal pressure is lower than the design operating pressure of the pressure relief mechanism, the mechanism may occasionally become ineffective. This shortens the lifespan of the pressure relief mechanism and affects the safety performance of the battery. Various other advantages and benefits will become apparent to those skilled in the art from the following detailed description of preferred embodiments. The accompanying drawings are merely for illustrating preferred embodiments and should not be construed as limiting the present application. Furthermore, the same reference numerals have been assigned to identical parts throughout the drawings. In the drawings, FIG. 1 is a schematic structural diagram of a vehicle according to some embodiments of the present application, and FIG. 2 is a schematic structural diagram of a battery according to some embodiments of the present application, and FIG. 3 is an exploded view of a battery cell according to some embodiment of the present application, and FIG. 4 is a front view of an end cap according to some embodiment of the present application, and FIG. 5 is a cross-sectional view along line aa of FIG. 4, and FIG. 6 is a perspective view of a pressure reduction mechanism according to some embodiment of the present application, and FIG. 7 is a drawing of the pressure reduction mechanism of FIG. 6, and FIG. 8 is a cross-sectional view along line bb of FIG. 7, and FIG. 9 is an enlarged view of the X1 area of FIG. 8, and FIG. 10 is a perspective view of a pressure reduction mechanism when the internal pressure or temperature of a battery cell is less than a first preset value, and FIG. 11 is a cross-sectional view of a pressure reduction mechanism, and FIG. 12 is an enlarged view of the X2 area of FIG. 11, and FIG. 13 is a perspective view of a case where the internal pressure or temperature of a battery cell increases above a first preset value and the second part is deformed in a state of upward protrusion, and FIG. 14 is a cross-sectional view of a pressure reduction mechanism, FIG. 15 is an enlarged view of the X3 area of FIG. 14, and FIG. 16 is a perspective view of a pressure reduction mechanism just before rupture, in which the internal pressure or temperature of a battery cell rises above a second preset value. FIG. 17 is a cross-sectional view of a pressure reduction mechanism, and FIG. 18 is an enlarged view of the X4 area of FIG. 17, and FIG. 19 is an enlarged view of a portion corresponding to region X1 in a pressure reduction mechanism according to some embodiment of the present application, and a modified example of the pressure reduction mechanism is shown, FIG. 20 is the initial state of a pressure reduction mechanism according to the existing technology, and FIG. 21 is an enlarged view of the X5 area of FIG. 20, and FIG. 22 shows the state of a depressurization mechanism according to conventional technology at low atmospheric pressure, and FIG. 23 is an enlarged view of the X6 region of FIG. 22, and FIG. 24 illustrates the ruptured state of a depressurization mechanism according to the prior art, and FIG. 25 is an enlarged view of the X7 area of FIG. 24, and FIG. 26 is a partial enlarged view of a pressure reduction mechanism according to another embodiment of the present application, and FIG. 27 is a perspective view of a pressure reduction mechanism according to another embodiment of the present application, and FIG. 28 is an enlarged view of the X9 area of FIG. 27, and FIG. 29 is a perspective view of the pressure reduction mechanism of FIG. 27 viewed from a different direction, and FIG. 30 is an enlarged view of the X10 area of FIG. 29, and FIG. 31 is a front view of the pressure reduction mechanism of FIG. 27 viewed from one side away from the battery cell, and FIG. 32 is a cross-sectional view of the pressure reduction mechanism of FIG. 31, and FIG. 33 is another cross-sectional view of the pressure reduction mechanism of FIG. 31, and FIG. 34 is a schematic flowchart of a method for manufacturing a bat