Explosion-proof valve, battery top cover and battery monomer

Abstract

The utility model belongs to the technical field of batteries, and discloses an explosion-proof valve, a battery top cover and a battery monomer, the explosion-proof valve comprises a valve plate, a first nick, a second nick and a first connecting part, the first nick and the second nick are semicircular and are symmetrically arranged on the same side surface of the valve plate, the first connecting part is arranged on the valve plate, and the second connecting part is arranged on the valve plate. The first nick and the second nick are connected through the first connecting part, the anti-explosion valve has relatively high use safety, the safety and the stability of the battery monomer can be improved, and in addition, the anti-explosion valve can improve the production efficiency and reduce the production cost.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to an explosion-proof valve, a battery top cover and a battery monomer. Background Art

[0002] Power batteries, such as lithium-ion batteries, are ideal power sources for a wide range of applications, including portable electronic devices and electric vehicles, due to their lightweight, compact size, high capacity, high power, and pollution-free properties. However, when a lithium-ion battery experiences an abnormality, a large amount of gas is generated within the battery, causing a sharp increase in internal pressure. If this large amount of gas is not removed, the battery can explode, potentially causing a safety incident. To prevent explosions, explosion-proof valves are typically added to power batteries.

[0003] Existing explosion-proof valves usually have a single-sided notched structure, that is, the notch is only set on one side of the valve plate, and the other side of the valve plate has no notch. When the pressure inside the battery increases sharply, the notch breaks to discharge the high-pressure gas inside the battery. The side without the notch can prevent the entire valve plate from flying out, ensuring the safety of the explosion-proof valve.

[0004] However, due to the uneven pressure distribution inside the battery, when assembling the explosion-proof valve and the battery cover, the different directions of the notches will result in different explosion values ​​of the explosion-proof valve. For example, in the width direction of the battery, the pressure on the first side inside the battery is greater than the pressure on the second side. Therefore, the explosion value of the explosion-proof valve when the notch is facing the first side will be different from the explosion value when the notch is facing the second side. It can be seen that the single-sided notch structure design reduces the stability of the explosion value of the explosion-proof valve, thereby reducing the safety and stability of the battery.

[0005] In the prior art, in order to avoid the above problems, manual methods or CCD recognition equipment are generally used to align the explosion-proof valve notches on the battery covers of the same batch to the same side. However, this method increases production costs and reduces production efficiency.

[0006] Therefore, it is urgent to propose an explosion-proof valve, a battery top cover and a battery cell to solve the above technical problems. Utility Model Content

[0007] The first object of the present utility model is to provide an explosion-proof valve, which has high safety in use and can improve the safety and stability of battery cells. In addition, the explosion-proof valve can improve production efficiency and reduce production costs.

[0008] To achieve this purpose, the present invention adopts the following technical solutions:

[0009] An explosion-proof valve includes a valve plate, a first notch, a second notch and a first connecting portion. The first notch and the second notch are symmetrically arranged on the same side surface of the valve plate. The first notch and the second notch are both semicircular. The first connecting portion is arranged on the valve plate, and the first notch and the second notch are connected by the first connecting portion.

[0010] Optionally, the explosion-proof valve also includes a second connecting portion, which is arranged on the outer periphery of the valve plate, extends along the circumference of the valve plate and is connected end to end, the thickness of the second connecting portion is greater than the thickness of the valve plate, and the second connecting portion is used to connect to the top cover body.

[0011] Optionally, the explosion-proof valve further includes a pressing portion connected to the second connecting portion, the top cover body is used to cover the opening of the battery shell, and the pressing portion is located on the side of the first connecting portion away from the battery shell.

[0012] Optionally, there are two pressing parts, and each pressing part is located at an end corresponding to the first connecting part.

[0013] Optionally, two ends of the first notch are respectively connected to two ends of the first connecting portion, and two ends of the second notch are respectively connected to two ends of the first connecting portion.

[0014] Optionally, the first connecting portion is S-shaped.

[0015] A second object of the present invention is to provide a battery top cover, which can improve the safety and stability of the battery cell. In addition, the battery top cover can improve production efficiency and reduce production costs.

[0016] To achieve this purpose, the present invention adopts the following technical solutions:

[0017] The battery top cover is characterized in that it comprises a top cover body and the above-mentioned explosion-proof valve, and the valve sheet is arranged on the top cover body.

[0018] Optionally, the explosion-proof valve also includes a second connecting part, which is arranged on the outer periphery of the valve plate, extends along the circumference of the valve plate and is connected end to end, an explosion-proof hole is provided on the top cover body, and the side wall of the second connecting part is connected to the hole wall of the explosion-proof hole.

[0019] Optionally, the side wall of the second connecting portion is provided with a first fool-proof structure, and the hole wall of the explosion-proof hole is provided with a second fool-proof structure, and the first fool-proof structure cooperates with the second fool-proof structure.

[0020] The third object of the present invention is to provide a battery cell having high safety and stability as well as high production efficiency and low production cost.

[0021] To achieve this purpose, the present invention adopts the following technical solutions:

[0022] The battery cell comprises a battery core, a battery shell and the above-mentioned battery top cover. The battery core is arranged in the battery shell, and the top cover body is arranged at the opening of the battery shell.

[0023] Beneficial effects of the utility model:

[0024] The explosion-proof valve provided by the present invention has a first notch, a second notch, and a first connecting portion on the valve plate. The first notch and the second notch are symmetrically arranged on the same side surface of the valve plate, and both the first notch and the second notch are semicircular. When the internal pressure of the battery cell increases, the first notch and the second notch are simultaneously stressed and can both break, thereby realizing a bidirectional symmetrical explosion structure of the explosion-proof valve. Compared with a single-sided notch structure, the first notch and the second notch, both being semicircular and symmetrically arranged, reduce the probability of different explosion values ​​of the explosion-proof valve, thereby improving the safety and stability of the battery cell. On the other hand, in actual production, there is no need to manually distinguish the positions of the first notch and the second notch through CCD recognition equipment, thereby achieving the effect of improving production efficiency and reducing production costs. On the other hand, the first notch and the second notch are connected by the first connecting portion. When the first notch and the second notch break, the first connecting portion can prevent the entire valve plate from flying out, ensuring the safety of the explosion-proof valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic structural diagram of the explosion-proof valve (before explosion) provided by the utility model;

[0026] Figure 2 This is a schematic structural diagram of the explosion-proof valve (after explosion) provided by the utility model;

[0027] Figure 3 This is a schematic structural diagram of a battery cell provided by the present invention (when the explosion-proof valve is not exploded);

[0028] Figure 4 It is a structural schematic diagram of a battery cell (after the explosion-proof valve is exploded) provided by the utility model.

[0029] In the picture:

[0030] 100, valve disc; 110, first diaphragm; 120, second diaphragm; 200, first notch; 300, second notch; 400, first connecting portion; 500, second connecting portion; 510, first foolproof structure; 600, pressing portion;

[0031] 10. Explosion-proof valve; 20. Top cover body;

[0032] 1. Battery case. DETAILED DESCRIPTION

[0033] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.

[0034] In the description of this utility model, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0035] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0036] In the description of this embodiment, the terms "upper," "lower," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0037] This embodiment provides an explosion-proof valve, which has high safety in use and can improve the safety and stability of battery cells. In addition, the explosion-proof valve can improve production efficiency and reduce production costs.

[0038] Specifically, if Figures 1 to 4As shown, the explosion-proof valve 10 includes a valve plate 100, a first notch 200, a second notch 300 and a first connecting portion 400, wherein the first notch 200 and the second notch 300 are symmetrically arranged on the same side surface of the valve plate 100, the first notch 200 and the second notch 300 are both semicircular, the first connecting portion 400 is arranged on the valve plate 100, and the first connecting portion 400 is located between the first notch 200 and the second notch 300, and the first notch 200 and the second notch 300 are connected through the first connecting portion 400.

[0039] Based on the above design, the valve plate 100 is provided with a first notch 200, a second notch 300, and a first connecting portion 400. The first notch 200 and the second notch 300 are symmetrically arranged on the same side surface of the valve plate 100, and both the first notch 200 and the second notch 300 are semicircular. When the internal pressure of the battery cell increases, the first notch 200 and the second notch 300 are simultaneously stressed and can both break, thereby achieving a bidirectional symmetrical bursting structure of the explosion-proof valve 10. Compared with a unilateral notch structure, the semicircular and symmetrical arrangement of the first notch 200 and the second notch 300 reduces the probability of different bursting values ​​of the explosion-proof valve 10, thereby improving the safety and stability of the battery cell. In addition, in actual production, there is no need to manually distinguish the positions of the first notch 200 and the second notch 300 through CCD recognition equipment, thereby achieving the effect of improving production efficiency and reducing production costs. On the other hand, the first notch 200 and the second notch 300 are connected by the first connecting portion 400. When the first notch 200 and the second notch 300 are broken, the first connecting portion 400 can prevent the valve plate 100 from flying out as a whole, thereby ensuring the safety of the explosion-proof valve 10.

[0040] Furthermore, if Figures 1 to 4 As shown, the two ends of the first notch 200 are respectively connected to the two ends of the first connecting part 400, and the two ends of the second notch 300 are respectively connected to the two ends of the first connecting part 400, thereby forming a first diaphragm 110 between the first notch 200 and the valve sheet 100 of the first connecting part 400, and forming a second diaphragm 120 between the second notch 300 and the first connecting part 400. When the first notch 200 and the second notch 300 are broken, the first diaphragm 110 and the second diaphragm 120 are lifted up to discharge the high-pressure gas in the battery shell 1. At the same time, the first connecting part 400 provides a more reliable pulling force for the first diaphragm 110 and the second diaphragm 120 to prevent the first diaphragm 110 and the second diaphragm 120 from flying out as a whole, thereby ensuring the safety of the explosion-proof valve 10.

[0041] Furthermore, if Figures 1 to 4As shown, the first connecting portion 400 is S-shaped. The S-shaped first connecting portion 400 can increase the connection length between the first connecting portion 400 and the first diaphragm 110 and the second diaphragm 120, thereby improving the reliability of the connection between the first diaphragm 110 and the first connecting portion 400, and the reliability of the connection between the second diaphragm 120 and the first connecting portion 400. In addition, the S-shaped first connecting portion 400 can make the force on the first diaphragm 110 and the second diaphragm 120 more evenly distributed, which is conducive to improving the precise control of the lifting angle of the first diaphragm 110 and the second diaphragm 120.

[0042] Alternatively, as Figures 1 to 4 As shown, the explosion-proof valve 10 also includes a second connecting portion 500, which is arranged on the outer periphery of the valve plate 100. The second connecting portion 500 extends along the circumference of the valve plate 100 and is connected end to end. The thickness of the second connecting portion 500 is greater than the thickness of the valve plate 100. The second connecting portion 500 is used to connect to the top cover body 20. This structural design expands the connection volume between the explosion-proof valve 10 and the top cover body 20, thereby improving the reliability of the connection between the explosion-proof valve 10 and the top cover body 20.

[0043] Alternatively, as Figures 1 to 4 As shown, the explosion-proof valve 10 also includes a pressing portion 600, which is connected to the second connecting portion 500. The top cover body 20 is used to cover the opening of the battery shell 1. The pressing portion 600 is located on the side of the first connecting portion 400 away from the battery shell 1. The pressing portion 600 can apply a force to the first connecting portion 400 toward the battery shell 1. The angle at which the first diaphragm 110 and the second diaphragm 120 are lifted will change with the change in the magnitude of the force. Specifically, when the force applied by the pressing portion 600 to the first connecting portion 400 is greater, the angle at which the first diaphragm 110 and the second diaphragm 120 are lifted is smaller. When the force applied by the pressing portion 600 to the first connecting portion 400 is smaller, the angle at which the first diaphragm 110 and the second diaphragm 120 are lifted is larger. Therefore, in actual production, the weight of the clamping part 600 can be changed to change the size of the force applied to the first connecting part 400, thereby changing the size of the lifting angle of the first diaphragm 110 and the second diaphragm 120, thereby achieving control of the lifting angle of the first diaphragm 110 and the second diaphragm 120.

[0044] Furthermore, if Figures 1 to 4 As shown, there are two pressing parts 600, each of which is located at one end corresponding to the first connecting part 400, so that the two ends of the first connecting part 400 are subjected to force more evenly, thereby improving the control accuracy of the lifting angle of the first diaphragm 110 and the second diaphragm 120.

[0045] It is understandable that the bursting pressure of the explosion-proof valve 10 can be controlled by changing the depths of the first score 200 and the second score 300 .

[0046] It should be noted that the pressing portion 600 is provided on the second connecting portion 500 . Therefore, the design of the pressing portion 600 will not be affected by the thickness of the valve plate 100 .

[0047] This embodiment also provides a battery top cover, which includes a top cover body 20 and the above-mentioned explosion-proof valve 10. The valve sheet 100 is arranged on the top cover body 20. The battery top cover adopts the above-mentioned explosion-proof valve 10, thereby improving the safety and stability of the battery cell. In addition, the battery top can improve production efficiency and reduce production costs.

[0048] Furthermore, if Figures 1 to 4 As shown, the explosion-proof valve 10 also includes a second connecting portion 500, which is arranged on the outer periphery of the valve plate 100. The second connecting portion 500 extends along the circumference of the valve plate 100 and is connected end to end. An explosion-proof hole (not shown in the figure) is provided in the middle position of the top cover body 20, and the side wall of the second connecting portion 500 is connected to the hole wall of the explosion-proof hole, so that the valve plate 100 is sealed at the explosion-proof hole through the second connecting portion 500.

[0049] Furthermore, if Figures 1 to 4 As shown, the side wall of the second connecting portion 500 is provided with a first fool-proof structure 510, and the hole wall of the explosion-proof hole is provided with a second fool-proof structure (not shown in the figure). The first fool-proof structure 510 cooperates with the second fool-proof structure. When the explosion-proof valve 10 and the top cover body 20 are assembled, the design of the first fool-proof structure 510 and the second fool-proof structure can quickly find the direction and position of the explosion-proof valve 10, which has the effect of improving the production efficiency of the battery top cover.

[0050] In this embodiment, Figures 1 to 4 As shown, the valve plate 100 is circular, the first fool-proofing structure 510 is a first fool-proofing plane arranged on the side wall of the second connecting part 500, and the first fool-proofing plane is a cutting surface along the axial direction of the valve plate 100. The second fool-proofing structure is a second fool-proofing plane arranged on the wall of the explosion-proof hole, and the first fool-proofing plane is in contact with the second fool-proofing plane.

[0051] In another embodiment, the first fool-proofing structure 510 is a groove provided on the side wall of the second connecting portion 500, and the second fool-proofing structure is a protrusion provided on the wall of the explosion-proof hole, and the protrusion is embedded in the groove.

[0052] This embodiment also provides a battery cell, which includes a battery cell, a battery shell 1 and the above-mentioned battery top cover. The battery cell is arranged in the battery shell 1, and the top cover body 20 is covered at the opening of the battery shell 1. The battery cell adopts the above-mentioned battery top cover, so it has higher safety and stability, and also has higher production efficiency and lower production cost.

[0053] like Figures 1 to 4 As shown, the explosion-proof valve 10 provided in this embodiment has a generally circular structure, with a circular valve plate 100 and semicircular first and second notches 200 and 300. This explosion-proof valve 10 is suitable for small-capacity rectangular battery cells. The following lists several dimensional parameters of the battery cells used in the explosion-proof valve 10 provided in this embodiment. The width dimension of the battery cell (the x-direction in the figure) is referred to as N1, and the length dimension of the battery cell (the y-direction in the figure) is referred to as N2.

[0054] Serial number N1 / mm N2 / mm 1 20 65 2 20 70 3 12 100 4 20 100 5 12 120 6 20 120 7 20 148 8 12 173 9 20 173

[0055] Obviously, the above-described embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the manner in which the present invention is to be implemented. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. Explosion-proof valve, characterized in that, The invention comprises a valve plate (100), a first notch (200), a second notch (300) and a first connecting portion (400), wherein the first notch (200) and the second notch (300) are symmetrically arranged on the same side surface of the valve plate (100), the first notch (200) and the second notch (300) are both semicircular, the first connecting portion (400) is arranged on the valve plate (100), and the first notch (200) and the second notch (300) are connected via the first connecting portion (400).

2. The explosion-proof valve according to claim 1, characterized in that: The explosion-proof valve (10) further includes a second connecting portion (500), which is arranged on the outer periphery of the valve plate (100), and the second connecting portion (500) extends along the circumference of the valve plate (100) and is connected end to end, and the thickness of the second connecting portion (500) is greater than the thickness of the valve plate (100), and the second connecting portion (500) is used to connect to the top cover body (20).

3. The explosion-proof valve according to claim 2, characterized in that: The explosion-proof valve (10) further includes a pressing portion (600), the pressing portion (600) being connected to the second connecting portion (500), the top cover body (20) being used to cover the opening of the battery shell (1), and the pressing portion (600) being located on a side of the first connecting portion (400) facing away from the battery shell (1).

4. The explosion-proof valve according to claim 3, characterized in that: There are two pressing portions (600), and each pressing portion (600) is located at a corresponding end of the first connecting portion (400).

5. The explosion-proof valve according to any one of claims 1 to 4, characterized in that: The two ends of the first notch (200) are respectively connected to the two ends of the first connecting portion (400), and the two ends of the second notch (300) are respectively connected to the two ends of the first connecting portion (400).

6. The explosion-proof valve according to claim 5, characterized in that: The first connecting portion (400) is S-shaped.

7. Battery top cover, characterized in that, It comprises a top cover body (20) and the explosion-proof valve (10) according to any one of claims 1 to 6, wherein the valve plate (100) is arranged on the top cover body (20).

8. The battery top cover according to claim 7, characterized in that: The explosion-proof valve (10) further comprises a second connecting portion (500), the second connecting portion (500) being arranged on the outer periphery of the valve plate (100), the second connecting portion (500) extending along the circumference of the valve plate (100) and being connected end to end, an explosion-proof hole being provided on the top cover body (20), and a side wall of the second connecting portion (500) being connected to a hole wall of the explosion-proof hole.

9. The battery top cover according to claim 8, characterized in that: The side wall of the second connecting portion (500) is provided with a first fool-proof structure (510), and the hole wall of the explosion-proof hole is provided with a second fool-proof structure, and the first fool-proof structure (510) cooperates with the second fool-proof structure.

10. A battery cell, characterized in that The invention comprises a battery cell, a battery shell (1) and a battery top cover according to any one of claims 7 to 9, wherein the battery cell is arranged in the battery shell (1), and the top cover body (20) is arranged at the opening of the battery shell (1).

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