Capping device and battery module

Abstract

The utility model provides a sealing cover device and a battery module. The sealing cover device comprises an anti-explosion valve and a cover plate, a mounting groove for accommodating the anti-explosion valve and an air hole communicated with the mounting groove are formed in the cover plate; the cover plate is provided with a first reinforcing structure and a second reinforcing structure; the first reinforcing structure is located on the periphery of the groove wall of the mounting groove and used for increasing the wall thickness of the position, combined with the anti-explosion valve, of the cover plate; and the second reinforcing structure is formed on the groove wall of the mounting groove and is used for being fixedly connected with the anti-explosion valve in a mutually embedded manner. According to the battery module disclosed by the utility model, by arranging the first reinforcing structure and the second reinforcing structure, the structural strength of the cover plate in the region where the anti-explosion valve is mounted can be enhanced, and the connection strength between the cover plate and the anti-explosion valve can be enhanced, so that the technical problem that the anti-explosion valve is easy to crack after the battery module is assembled is solved.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to a sealing device and a battery module. Background Technology

[0002] In related technologies, during the battery module assembly process, the cover plate outside the battery module used to seal the internal space of the battery is subjected to force. The application of this external force makes the cover plate prone to deformation, which makes the explosion-proof valve installed on the cover plate prone to deformation and cracking after assembly, causing the explosion-proof valve to fail. Utility Model Content

[0003] The embodiments of this utility model provide a sealing device and a battery module, which can improve the technical problem of low production yield of batteries when assembling modules.

[0004] In a first aspect, embodiments of the present invention provide a sealing device, comprising:

[0005] Explosion-proof valve;

[0006] The cover plate has a mounting groove for accommodating the explosion-proof valve and an air hole communicating with the mounting groove;

[0007] The cover plate is provided with:

[0008] The first type of reinforcing structure is located on the periphery of the groove wall of the mounting groove, and is used to increase the wall thickness of the cover plate at the position where it is combined with the explosion-proof valve;

[0009] The second type of reinforcing structure is formed on the groove wall of the mounting groove and is used to form a fixed connection with the explosion-proof valve.

[0010] In some embodiments, the mounting groove is connected to one end of the vent along a first direction;

[0011] The first type of reinforcing structure includes:

[0012] The first protrusion protrudes from the surface of the cover plate and is located on the periphery of the wall of the air hole;

[0013] The first protrusion is located at the end of the air hole that is away from the mounting groove along the first direction.

[0014] In some embodiments, the first protrusion surrounds the periphery of the vent.

[0015] In some embodiments, the height of the first protrusion protruding from the surface of the cover plate ranges from 0.5 to 1.5 mm.

[0016] In some embodiments, the mounting groove is connected to one end of the vent along a first direction;

[0017] The first type of reinforcing structure also includes:

[0018] The second protrusion protrudes from the surface of the cover plate at one end near the mounting groove along the first direction and is located on the periphery of the mounting groove.

[0019] In some embodiments, the second protrusion surrounds the periphery of the mounting groove.

[0020] In some embodiments, the height of the second protrusion protruding from the surface of the cover plate ranges from 0.2 to 1.0 mm.

[0021] In some embodiments, the second type of reinforcing structure includes:

[0022] The first inner groove is recessed into the wall thickness of the mounting groove;

[0023] The explosion-proof valve is equipped with:

[0024] The third protrusion is inserted into the first inner groove to fit into the first inner groove.

[0025] In some embodiments, the third protrusion protrudes from the surface of the explosion-proof valve along the first direction; the first inner groove is open at one end along the first direction so that the third protrusion is inserted into the first inner groove along the first direction.

[0026] In some embodiments, the third protrusion is provided with:

[0027] A guide surface is formed at one end of the third protrusion along the first direction to guide the third protrusion into the first inner groove.

[0028] In some embodiments, the third protrusion is disposed around the periphery of the vent.

[0029] In some embodiments, the ratio of the depth of the first inner groove recessed in the mounting groove along the first direction to the height of the third protrusion protruding from the surface of the explosion-proof valve along the first direction ranges from 1.0 to 1.1.

[0030] In some embodiments, the height at which the third protrusion protrudes from the surface of the explosion-proof valve along the first direction ranges from 0.1 to 0.5 mm.

[0031] In some embodiments, the second type of reinforcement structure further includes:

[0032] The fourth protrusion protrudes along the first direction and is formed in the groove wall of the mounting groove;

[0033] The explosion-proof valve is also equipped with:

[0034] The second inner groove is recessed into the surface of the explosion-proof valve to allow the fourth protrusion to be inserted.

[0035] In some embodiments, the height at which the fourth protrusion protrudes from the wall of the mounting groove along the first direction ranges from 0.1 to 0.5 mm.

[0036] Secondly, embodiments of this utility model provide a battery module, including the sealing device described above.

[0037] The beneficial effects of the embodiments of this utility model are as follows:

[0038] In the embodiments of this utility model, by setting a first type of reinforcing structure and a second type of reinforcing structure, the structural strength of the cover plate in the area where the explosion-proof valve is installed can be strengthened, as well as the connection strength between the cover plate and the explosion-proof valve can be strengthened. This reduces or even avoids deformation of the cover plate during assembly that is detrimental to the normal use of the explosion-proof valve. This improves the technical problem that the explosion-proof valve is prone to deformation after assembly due to external forces on the cover plate during battery pack assembly, which in turn leads to cracking of the explosion-proof valve after battery module assembly. Attached Figure Description

[0039] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0040] Figure 1 This is an exploded view of the sealing device provided in an embodiment of this utility model;

[0041] Figure 2 This is a perspective sectional view of the sealing device provided in an embodiment of the present utility model;

[0042] Figure 3 This is a perspective sectional view of a cover plate in a sealing device provided in an embodiment of this utility model;

[0043] Figure 4 yes Figure 3 A sectional view of the cover plate shown;

[0044] Figure 5 yes Figure 4 A magnified view of a section at point B in the middle;

[0045] Figure 6 yes Figure 2 A magnified view of a section at point A in the middle;

[0046] Figure 7 This is a three-dimensional sectional view of an explosion-proof valve in a sealing device provided in an embodiment of this utility model;

[0047] Figure 8 This is a schematic diagram of another type of cover plate in the sealing device provided by an embodiment of this utility model;

[0048] Figure 9 This is a three-dimensional schematic diagram of another explosion-proof valve in the sealing device provided in an embodiment of this utility model;

[0049] Figure 10 This is a three-dimensional schematic diagram of the battery module provided in an embodiment of this utility model.

[0050] Explanation of reference numerals in the attached figures:

[0051] 10. Battery module;

[0052] 100. Sealing device;

[0053] 110. Explosion-proof valve;

[0054] 111, Third protrusion; 111a, Guide surface;

[0055] 112. Second inner groove;

[0056] 120, cover plate; 120a, mounting groove; 120b, vent hole;

[0057] 121. First type of reinforcing structure; 121a. First protrusion; 121b. Second protrusion;

[0058] 122. Second type of reinforcing structure; 122a. First inner groove; 122b. Fourth protrusion;

[0059] X1, First direction. Detailed Implementation

[0060] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model. In addition, it should be understood that the specific embodiments described herein are only for illustration and explanation of the present utility model and are not intended to limit the present utility model. In the present utility model, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0061] Reference Figures 1 to 9 As shown, in a first aspect of this application, an embodiment of the present invention provides a sealing device 100, comprising: an explosion-proof valve 110 and a cover plate 120.

[0062] The explosion-proof valve 110 is used to prevent battery overpressure and avoid battery explosion when the sealing device 100 is integrated onto the battery. When the internal pressure of the battery is too high, the explosion-proof valve 110 will open to release excess gas and prevent battery explosion. Regarding the specific structure and principle of the explosion-proof valve 110 in preventing battery overpressure, for example, grooves can be provided on the surface of the explosion-proof valve 110 to make the wall thickness thinner at the groove location. When the internal pressure of the battery is too high, the gas inside the battery can force open the thinner area of ​​the explosion-proof valve 110 to release gas. The explosion-proof valve 110 can also adopt other forms to achieve the function of preventing battery overpressure, which will not be elaborated here. The corresponding structure of the explosion-proof valve 110 to prevent battery overpressure is not specifically shown in the attached drawings.

[0063] Reference Figure 2 and Figure 3 As shown, the cover plate 120 has a mounting groove 120a for accommodating the explosion-proof valve 110, and a vent 120b communicating with the mounting groove 120a. The explosion-proof valve 110 is positioned and installed in the mounting groove 120a. When the internal pressure of the battery is too high, the gas inside the battery forces open the explosion-proof valve 110 and is discharged to the outside of the battery through the vent 120b.

[0064] To reduce or even avoid the failure of the explosion-proof valve 110 during the assembly and production of battery modules, refer to Figure 2 and Figure 3 As shown, in the sealing device 100 provided by this utility model, the cover plate 120 is provided with: a first type of reinforcing structure 121 and a second type of reinforcing structure 122.

[0065] The first type of reinforcing structure 121 is located on the outer periphery of the groove wall of the mounting groove 120a, and is used to increase the wall thickness of the cover plate 120 at the joint position with the explosion-proof valve 110. The second type of reinforcing structure 122 is formed on the groove wall of the mounting groove 120a, and is used to form a fixed connection with the explosion-proof valve 110.

[0066] By adopting the above scheme, by setting the first type of reinforcing structure 121 and the second type of reinforcing structure 122, on the one hand, during the assembly of the battery module, the first type of reinforcing structure 121 can be used to strengthen the structural strength of the cover plate 120 in the area where the explosion-proof valve 110 is installed, reduce the impact of external forces on the structural stability of the cover plate 120 in the local area where the explosion-proof valve 110 is installed, and reduce or even avoid deformation of the cover plate 120 that is detrimental to the normal use of the explosion-proof valve 110 during the assembly process. On the other hand, the second type of reinforcing structure 122 is used to strengthen the connection between the cover plate 120 and the explosion-proof valve 110, making the connection between the explosion-proof valve 110 and the cover plate 120 tighter. This allows the cover plate 120 to provide more stable installation support for the explosion-proof valve 110, reducing the possibility of abnormal deformation of the explosion-proof valve 110 due to external forces. Through these various settings, the technical problem of the explosion-proof valve 110 being prone to deformation and cracking after battery module assembly can be solved by external forces on the cover plate 120 during battery pack assembly (for example, the cover plate being subjected to shear forces in different directions due to the installation of positive and negative terminals at different positions during assembly).

[0067] As an example of the first type of reinforcing structure 121, the first type of reinforcing structure 121 is, for example, a sheet metal piece installed on the cover plate 120 by means of welding, threaded fixing, etc., thereby increasing the structural strength of the cover plate 120. Of course, other solutions can also be adopted for the first type of reinforcing structure 121.

[0068] In some embodiments, the mounting groove 120a is connected to one end of the vent 120b along the first direction X1. Correspondingly, the explosion-proof valve 110 can be inserted into the mounting groove 120a from one end of the vent 120b along the first direction X1 to realize the combination of the explosion-proof valve 110 and the cover plate 120.

[0069] As further examples of the first type of reinforcing structure 121, see [reference] Figure 3 , Figure 4 and Figure 5 As shown, the first type of reinforcing structure 121 includes a first protrusion 121a. The first protrusion 121a protrudes from the surface of the cover plate 120 and is located on the periphery of the wall of the vent. The first protrusion 121a is located at the end of the vent away from the mounting groove 120a along the first direction X1. By increasing the wall thickness of the cover plate 120 in the region surrounding the vent, the structural strength of the cover plate 120 is improved. When the cover plate 120 is subjected to external torque or other forms of external force, the first protrusion 121a prevents deformation of the cover plate 120 near the vent, thereby reducing the possibility of failure of the explosion-proof valve 110. In practical application, since the first protrusion 121a can be formed with the cover plate 120 in one step, no additional process is required, making the manufacturing process relatively simple.

[0070] In some embodiments, the first protrusion 121a surrounds the periphery of the vent, that is, the first protrusion 121a surrounds the vent circumference, so that the first protrusion 121a has a relatively complete effect of strengthening the structural strength of the periphery of the vent. When the cover plate 120 is subjected to external forces in different directions, the first protrusion 121a can provide the function of preventing the deformation of the cover plate 120, so as to further reduce the possibility of the explosion-proof valve cracking after the battery module is assembled.

[0071] As another example of the first type of reinforcing structure 121, the first type of reinforcing structure 121 further includes a second protrusion 121b. The second protrusion 121b protrudes from the surface of the cover plate 120 along the first direction X1 near one end of the mounting groove 120a and is located on the periphery of the mounting groove 120a.

[0072] Similar to the first protrusion 121a, the second protrusion 121b increases the structural strength of the cover plate 120 by increasing the wall thickness in the area surrounding the mounting groove 120a. When the cover plate 120 is subjected to external torque or other forms of external force, the second protrusion 121b prevents deformation of the cover plate 120 near the mounting groove 120a, thereby reducing the possibility of failure of the explosion-proof valve 110. Furthermore, in practical applications, this implementation scheme simplifies the manufacturing process because the second protrusion 121b can be formed in one piece with the cover plate 120 without requiring additional processing steps.

[0073] Understandably, in practical applications, considering the fit between the sealing device 100 and other structures of the battery module, the first protrusion 121a or the second protrusion 121b can be provided only on the cover plate 120. This reduces the need for adaptive designs in other parts of the battery module to accommodate the first protrusion 121a or the second protrusion 121b. Of course, both the first protrusion 121a and the second protrusion 121b can also be provided on the cover plate 120 to increase the structural strength of the cover plate 120.

[0074] Similar to the first protrusion 121a, in some embodiments, the second protrusion 121b surrounds the periphery of the mounting groove 120a. That is, the second protrusion 121b surrounds the vent completely, so that the second protrusion 121b has a relatively complete reinforcing effect on the periphery of the vent. When the cover plate 120 is subjected to external forces in different directions, the second protrusion 121b can provide resistance to the deformation of the cover plate 120, thereby further reducing the possibility of the explosion-proof valve cracking after the battery module is assembled.

[0075] Considering the impact of the first protrusion 121a or the second protrusion 121b on the overall dimensions of the cover plate 120 in practical applications, and at the same time ensuring that the first protrusion 121a or the second protrusion 121b has a significant reinforcing effect on the structural strength of the cover plate 120 to reduce the possibility of failure of the explosion-proof valve 110, in some embodiments, refer to Figure 5 As shown, the height 'a' of the first protrusion 121a protruding from the surface of the cover plate 120 can range from 0.5 to 1.5 mm. Correspondingly, the height 'b' of the second protrusion 121b protruding from the surface of the cover plate 120 can range from 0.2 to 1.0 mm.

[0076] In specific implementations, considering the size difference between the first protrusion 121a and the second protrusion 121b, when integrating the sealing device 100 onto the battery module, for example, the one with a smaller height of the first protrusion 121a and the second protrusion 121b can be disposed inside the outer casing of the battery module, while the one with a larger height of the first protrusion 121a and the second protrusion 121b can be disposed outside the outer casing of the battery module. As an exemplary illustration of the second type of reinforcing structure 122, in some embodiments, reference is made to... Figure 6 and Figure 7 As shown, the second type of reinforcing structure 122 includes: a first inner groove 122a. The explosion-proof valve 110 is provided with: a third protrusion 111.

[0077] The first inner groove 122a is recessed into the wall thickness of the mounting groove 120a. The third protrusion 111 is inserted into the first inner groove 122a to engage with it. By providing the engaging third protrusion 111 and the first inner groove 122a, the contact area between the explosion-proof valve 110 and the cover plate 120 is increased, making the connection between the explosion-proof valve 110 and the cover plate 120 more stable. This connection makes the explosion-proof valve 110 less prone to deformation due to movement relative to the cover plate 120 under pressure when subjected to force or torque transmitted from the cover plate 120, thereby reducing the possibility of failure of the explosion-proof valve 110.

[0078] In some embodiments, the third protrusion 111 protrudes from the surface of the explosion-proof valve 110 along the first direction X1. The first inner groove 122a is open at one end along the first direction X1, so that the third protrusion 111 is inserted into the first inner groove 122a along the first direction X1. Since the explosion-proof valve 110 is connected to the mounting groove 120a from one end along the first direction X1, the above arrangement enables the third protrusion 111 to fit into the first inner groove 122a during the process of the explosion-proof valve 110 being connected to the cover plate 120, and the explosion-proof valve 110 itself is not easily deformed during the process, so as to avoid the failure of the explosion-proof valve 110.

[0079] In some embodiments, the third protrusion 111 is provided with a guide surface 111a. The guide surface 111a is formed at one end of the third protrusion 111 along a first direction X1 to guide the third protrusion 111 into the first inner groove 122a. By providing the guide surface 111a, during the integration of the explosion-proof valve 110 into the cover plate 120, the third protrusion 111 can be smoothly embedded into the first inner groove 122a, thereby ensuring that the explosion-proof valve 110 can be accurately positioned and installed on the cover plate 120, and ensuring a stable connection between the explosion-proof valve 110 and the cover plate 120.

[0080] In some embodiments, the third protrusion 111 is disposed around the periphery of the vent 120b. That is, the third protrusion 111 protrudes from the surface of the explosion-proof valve 110 in a circumferential manner, thereby further improving the structural strength of the explosion-proof valve 110 itself and reducing the possibility of abnormal deformation of the explosion-proof valve 110.

[0081] In some embodiments, the ratio of the depth c of the first inner groove 122a recessed in the mounting groove 120a along the first direction X1 to the height d of the third protrusion 111 protruding out of the surface of the explosion-proof valve 110 along the first direction X1 ranges from 1.0 to 1.1. For example, this ratio can be 1. This arrangement ensures that the depth of the first inner groove 122a is greater than or equal to the height of the third protrusion 111, allowing the third protrusion 111 to be more completely embedded in the first inner groove 122a. This facilitates the proper fit of other parts of the explosion-proof valve 110 with the groove wall of the mounting groove 120a, further ensuring a stable connection between the explosion-proof valve 110 and the cover plate 120.

[0082] As another exemplary illustration of the second type of reinforcing structure 122, in some embodiments, reference is made to... Figure 8 and Figure 9 As shown, the second type of reinforcing structure 122 also includes a fourth protrusion 122b. The explosion-proof valve 110 also has a second inner groove 112.

[0083] The fourth protrusion 122b protrudes along the first direction X1 and is formed in the groove wall of the mounting groove 120a. The second inner groove 112 is recessed into the surface of the explosion-proof valve 110 to allow the fourth protrusion 122b to be inserted. That is, the engagement of the fourth protrusion 122b and the second inner groove 112 increases the contact area between the explosion-proof valve 110 and the cover plate 120, thereby improving the connection strength between the explosion-proof valve 110 and the cover plate 120.

[0084] In some embodiments, the fourth protrusion 122b does not necessarily need to protrude from the wall of the mounting groove 120a in a circumferential manner. Correspondingly, the second inner groove 112 may simply be a notch on the explosion-proof valve 110 for the fourth protrusion 122b to be inserted. Considering that in battery modules, the explosion-proof valve 110 provided on the cover plate 120 is often a valve plate type, that is, the explosion-proof valve 110 has a relatively thin thickness, the above arrangement can reduce the impact of the second inner groove 112 on the structural strength of the explosion-proof valve 110 itself.

[0085] It is understandable that, similar to the way the third protrusion 111 and the first inner groove 122a cooperate, the depth of the second inner groove 112 can be greater than or equal to the height of the fourth protrusion 122b, so as to ensure that the surface of the explosion-proof valve 110 fits against the groove wall of the mounting groove 120a.

[0086] In some embodiments, the explosion-proof valve 110 may have both a third protrusion 111 and a second inner groove 112, i.e., the second inner groove 112 is formed on the third protrusion 111. Correspondingly, the cover plate 120 has both a first inner groove 122a and a fourth protrusion 122b. This design can increase the contact area between the explosion-proof valve 110 and the cover plate 120 by utilizing the third protrusion 111 and the second inner groove 112. At the same time, since the second inner groove 112 is located on the thicker third protrusion 111, it has a smaller impact on the structural strength of the explosion-proof valve 110 itself. This design is not shown in the accompanying drawings.

[0087] Considering the impact of the first inner groove 122a on the structural strength of the cover plate 120, or the impact of the second inner groove 112 on the structural strength of the explosion-proof valve 110 itself, in some embodiments, the height d of the third protrusion 111 protruding from the surface of the explosion-proof valve 110 along the first direction X1 ranges from 0.1 to 0.5 mm. Correspondingly, the height e of the fourth protrusion 122b protruding from the groove wall of the mounting groove 120a along the first direction X1 ranges from 0.1 to 0.5 mm.

[0088] According to a second aspect of the present invention, referring to Figure 10 As shown, an embodiment of this utility model provides a battery module 10, which includes the aforementioned sealing device 100. The battery module 10 possesses all the beneficial effects of the aforementioned sealing device 100, which will not be repeated here.

[0089] The embodiments of this utility model have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this utility model. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A capping device (100), characterized in that, The explosion-proof valve (110) is provided with: a cover plate (120) formed with a mounting groove (120a) for accommodating the explosion-proof valve (110) and an air hole (120b) in communication with the mounting groove (120a); wherein the cover plate (120) is provided with: a first type of reinforcing structure (121) located at the periphery of the groove wall of the mounting groove (120a) for increasing the wall thickness of the cover plate (120) at the combined position with the explosion-proof valve (110); a second type of reinforcing structure (122) formed on the groove wall of the mounting groove (120a) for forming a mutually embedded fixed connection with the explosion-proof valve (110).

2. The sealing cover device (100) according to claim 1, wherein: the mounting groove (120a) is in communication with one end of the air hole (120b) along a first direction (X1); the first type of reinforcing structure (121) comprises: a first protruding portion (121a) protrudingly formed on the surface of the cover plate (120) and located at the periphery of the wall surface of the air hole; wherein the first protruding portion (121a) is located at the end of the air hole away from the mounting groove (120a) along the first direction (X1).

3. The sealing cover device (100) according to claim 2, wherein: the first protruding portion (121a) surrounds the periphery of the air hole.

4. The sealing cover device (100) according to claim 2, wherein: the height of the first protruding portion (121a) protruding from the surface of the cover plate (120) is in the range of 0.5 to 1.5 mm.

5. The sealing cover device (100) according to claim 2, wherein: the mounting groove (120a) is in communication with one end of the air hole (120b) along a first direction (X1); the first type of reinforcing structure (121) further comprises: a second protruding portion (121b) protrudingly formed on the surface of the cover plate (120) at the end close to the mounting groove (120a) along the first direction (X1) and located at the periphery of the mounting groove (120a).

6. The sealing cover device (100) according to claim 5, wherein: the second protruding portion (121b) surrounds the periphery of the mounting groove (120a).

7. The sealing cover device (100) according to claim 5, wherein: the height of the second protruding portion (121b) protruding from the surface of the cover plate (120) is in the range of 0.2 to 1.0 mm.

8. The sealing cover device (100) according to any one of claims 2-7, wherein: the second type of reinforcing structure (122) comprises: a first inner groove (122a) recessedly formed at the wall thickness of the mounting groove (120a); the explosion-proof valve (110) is provided with: a third protruding portion (111) inserted into the first inner groove (122a) to be mutually embedded with the first inner groove (122a).

9. The sealing cover device (100) according to claim 8, wherein: ​ The third protruding part (111) protrudes from the surface of the explosion-proof valve (110) along the first direction (X1); and the first inner groove (122a) is open at one end along the first direction (X1) to allow the third protruding part (111) to be inserted into the first inner groove (122a) along the first direction (X1).

10. The capping device (100) according to claim 9, characterized in that, The third protruding part (111) is provided with: a guide curve (111a) formed at one end of the third protruding part (111) along the first direction (X1) to guide the third protruding part (111) to be embedded in the first inner groove (122a).

11. The capping device (100) according to claim 8, characterized in that, The third protruding part (111) is arranged around the periphery of the air hole (120b).

12. The capping device (100) according to claim 8, characterized in that, The first inner groove (122a) is recessed in the mounting groove (120a) along the first direction (X1) to a depth, and the ratio of the height of the third protruding part (111) protruding from the surface of the explosion-proof valve (110) along the first direction (X1) to the depth of the first inner groove (122a) is in the range of 1.0 to 1.

1.

13. The capping device (100) according to claim 12, characterized in that, The height of the third protruding part (111) protruding from the surface of the explosion-proof valve (110) along the first direction (X1) is in the range of 0.1 to 0.5 mm.

14. The capping device (100) according to any one of claims 2-7, characterized in that, The second type of reinforcing structure (122) further comprises: a fourth protruding part (122b) protruding along the first direction (X1) and formed at the groove wall of the mounting groove (120a); The explosion-proof valve (110) is further provided with: a second inner groove (112) recessed and formed on the surface of the explosion-proof valve (110) for the fourth protruding part (122b) to be embedded.

15. The capping device (100) according to claim 14, characterized in that, The height of the fourth protruding part (122b) protruding from the groove wall of the mounting groove (120a) along the first direction (X1) is in the range of 0.1 to 0.5 mm.

16. A battery module (10) characterized by The capping device (100) according to any one of claims 1-15.

Images