Sealing assembly and battery cell

Abstract

The embodiment of the invention provides a sealing assembly and a battery cell. The sealing assembly comprises a cover plate, a first convex piece and a formation nail, a first mounting groove is formed in the cover plate, and a first through hole is formed in the groove bottom wall of the first mounting groove; the first protruding piece is arranged on the periphery of the first through hole, and a first groove is formed between the first protruding piece and the groove side wall of the first installation groove. The formation nail is detachably connected to the cover plate in a matched mode, the formation nail comprises a nail body and a second protruding piece, the second protruding piece is formed on the surface, facing the first through hole, of the nail body in a protruding mode, and a second groove is defined by the second protruding piece; when the formation nail is connected in the first mounting groove in a matched mode, at least part of the first protruding piece is contained in the second groove, the groove bottom wall of the second groove is arranged on the first through hole in a covering mode, and the second protruding piece is detachably contained in the first groove. The sealing assembly provided by the invention is favorable for reducing the probability that chippings enter the battery monomer to influence the performance of the battery monomer under the condition of meeting the sealing requirement.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a sealing assembly and a battery cell. Background Art

[0002] Batteries are currently widely used in many fields such as electronic devices, energy storage, electric vehicles, etc. For example, in the automotive field, batteries are used as the energy source of the car.

[0003] In the formation stage of battery manufacturing, the gas in the battery generally needs to be discharged through the injection hole. In order to prevent the liquid inside the battery from volatilizing or flowing out before and after the formation stage, and to prevent dust, water, etc. outside the battery from entering the battery, the injection hole needs to be sealed.

[0004] In the related art, the sealing is usually achieved by the interference fit between the formation nail and the injection hole. However, before and after the formation stage, in the process of opening and sealing the injection hole by inserting and removing the formation nail, the formation nail will rub against the inner wall of the injection hole to produce debris that falls into the battery, thereby affecting the performance of the battery. Summary of the invention

[0005] Based on this, the embodiments of the present application provide a sealing assembly and a battery cell that can reduce debris from falling into the battery cell.

[0006] An aspect of an embodiment of the present application provides a sealing assembly, the sealing assembly comprising:

[0007] A cover plate, on which a first mounting groove is formed, and a first through hole is formed on a bottom wall of the first mounting groove along a thickness direction of the cover plate;

[0008] A first protrusion is disposed on the outer periphery of the first through hole and defines a first groove with the side wall of the first mounting groove; and

[0009] A chemical nail is detachably mounted on the cover plate; the chemical nail comprises a nail body and a second protrusion, the second protrusion is formed on the surface of the nail body facing the first through hole, and the second protrusion itself is enclosed to form a second groove;

[0010] When the chemically formed nail is fitted in the first installation groove, the first protrusion is at least partially accommodated in the second groove, and the bottom wall of the second groove covers the first through hole, and the second protrusion is detachably accommodated in the first groove.

[0011] In some embodiments, the first mounting slot has a first wall surface facing the first groove, the second protrusion has a second wall surface facing away from the second groove, and the first wall surface is tightly matched with the second wall surface.

[0012] In some embodiments, the first wall surface and the second wall surface are provided with threads that can cooperate with each other.

[0013] In some embodiments, the first protrusion has a third wall surface facing the first groove, the second protrusion has a fourth wall surface facing the second groove, and the third wall surface is in sealing contact with the fourth wall surface.

[0014] In some embodiments, the bottom wall of the second groove is sealingly abutted against the first protrusion to seal the first through hole.

[0015] In some embodiments, the cover plate is further provided with a second mounting groove, the inner diameter of the second mounting groove is larger than the inner diameter of the first mounting groove, and the bottom wall of the second mounting groove is connected to the first mounting groove, so that a step portion is formed between the first mounting groove and the second mounting groove;

[0016] Wherein, a third groove is formed between the nail body and the surface of the second protrusion facing away from the second groove, and the step portion is accommodated in the third groove.

[0017] In some embodiments, the stepped portion and the third groove are in close contact with each other.

[0018] In some embodiments, the step portion is chamfered.

[0019] In some embodiments, the first protrusion is a closed ring structure arranged around the outer circumference of the first through hole.

[0020] The sealing assembly provided in the embodiment of the present application, by providing a first through hole, is conducive to the fluid entering and exiting the battery cell through the first through hole; by providing a first groove, it is conducive to accommodating debris to reduce the probability of debris entering the first through hole; by providing a first protrusion, it is conducive to blocking debris in the first groove from entering the first through hole and then entering the battery cell in a direction perpendicular to the thickness of the cover plate; at least part of the first protrusion is located in the second groove, which is conducive to the second groove covering one side opening of the first through hole; by providing a cover plate, a first protrusion and a formation nail, it is conducive to meeting the sealing requirements and reducing the probability of fluid entering and exiting the battery cell to affect the performance of the battery cell, thereby reducing the probability of debris affecting the performance of the battery cell.

[0021] Another aspect of an embodiment of the present application provides a battery cell, comprising a shell and any one of the sealing assemblies described above, wherein the sealing assembly is sealed to the shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1It is a cross-sectional schematic diagram of the cooperation between the chemical forming nail and the injection hole for sealing in the related art.

[0023] Figure 2 This is a schematic diagram from a first perspective of a sealing assembly in some embodiments of the present application.

[0024] Figure 3 This is a schematic diagram from a second perspective of the sealing assembly in some embodiments of the present application.

[0025] Figure 4 for Figure 3 Schematic diagram of the cross section of the middle sealing assembly along the AA direction.

[0026] Figure 5 for Figure 4 A magnified schematic diagram of point B in the middle.

[0027] Figure 6 This is a schematic diagram of a cover plate from a third viewing angle in some embodiments of the present application.

[0028] Figure 7 for Figure 6 Enlarged schematic diagram of point C in the middle.

[0029] Figure 8 This is a schematic diagram from a fourth perspective of the formed nails in some embodiments of the present application.

[0030] Description of Reference Numerals

[0031] 10. Cover plate; 11a. First through hole; 12a. First mounting groove; 12b. First wall; 12c. First groove; 121. Chamfer; 13a. Second mounting groove; 14. Step portion; 20. First protrusion; 21a. Third wall; 30. Formed nail; 31. Second protrusion; 31a. Second wall; 32a. Second groove; 32b. Fourth wall; 33. Nail body; 34a. Third groove; 50a. Filling hole; 60. Sealing assembly. DETAILED DESCRIPTION

[0032] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0033] In the description of the present application, it should be understood that if the terms "thickness", "circumferential", etc. appear, the orientation or positional relationship indicated by these terms is based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0034] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0035] In this application, unless otherwise clearly specified and limited, if the terms "installation", "connection", "fixation" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0036] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element at the same time.

[0037] In the related art, see Figure 1 The injection hole 50 a is sealed by the formation nail 30 , and an interference fit is formed between the formation nail 30 and the injection hole 50 a , so that the formation nail 30 can seal the injection hole 50 a .

[0038] However, due to the interference fit between the formation nail 30 and the injection hole 50a, when the formation nail 30 is inserted into and pulled out of the injection hole 50a, the formation nail 30 will rub against the inner wall of the injection hole 50a to produce debris that falls into the battery cell, thereby affecting the performance of the battery cell.

[0039] Based on this, see Figures 2 to 5The present application embodiment provides a sealing assembly 60, which includes a cover plate 10, a first protruding member 20 and a forming nail 30. The cover plate 10 is provided with a first mounting groove 12a, and the bottom wall of the first mounting groove 12a is provided with a first protruding member 20 and a first protruding member 30. Figure 4 and Figure 5 A first through hole 11a is formed through the first through hole 11a in the direction Y in the middle. The first protrusion 20 is arranged on the outer periphery of the first through hole 11a and defines a first groove 12c with the side wall of the first mounting groove 12a. It can be understood that the first groove 12c is formed in the first mounting groove 12a. The chemical nail 30 is detachably mounted on the cover plate 10 and includes a nail body 33 and a second protrusion 31. The second protrusion 31 is formed on the surface of the nail body 33 facing the first through hole 11a, and the second protrusion 31 itself encloses a second groove 32a.

[0040] When the formation nail 30 is matched in the first installation groove 12a, the first protrusion 20 is at least partially accommodated in the second groove 32a, and the second protrusion 31 is at least partially accommodated in the first installation groove 12a. The debris generated during the matching process can be accommodated in the first groove 12c (it can be understood that the debris is also accommodated in the first installation groove 12a at the same time), effectively preventing the debris from entering the battery cell through the first through hole 11a and affecting the performance of the battery cell. Further, the bottom wall of the second groove 32a is covered on the first through hole 11a, so that the bottom wall of the second groove 32a can cover the opening of one side of the first through hole 11a, thereby reducing the probability of debris entering the battery cell and affecting the performance of the battery cell, and at the same time, it is also beneficial to prevent the fluid in the battery cell from flowing out of the first through hole 11a, reducing the probability of the fluid flowing out of the battery cell affecting the formation nail 30.

[0041] Furthermore, the second protrusion 31 is detachably accommodated in the first groove 12c, which can facilitate the assembly and disassembly of the formation nail 30 and the cover plate 10, thereby facilitating the formation nail 30 and the cover plate 10 to be suitable for different stages of the battery cell production process, thereby reducing costs. In addition, since the second protrusion 31 cooperates with the wall surface of the first groove 12c, and the first protrusion 20 cooperates with the wall surface of the second groove 32a, the formation nail 30 can seal the first through hole 11a, thereby preventing the internal fluid of the battery cell from flowing out during the formation stage.

[0042] It should be noted that the fluids mentioned above include air and water in the external environment, as well as gas and electrolyte inside the battery cells, etc. At the same time, the debris mentioned above includes debris generated by friction between the formation nails 30 and the cover plate 10 during installation and removal from the cover plate 10, as well as dust and other debris outside the sealing assembly 60.

[0043] In some specific embodiments of the present application, the first protrusion 20 is a closed ring structure arranged around the outer periphery of the first through hole 11a, which helps the first protrusion 20 block debris from entering the battery cell through the first through hole 11a in all directions along the first through hole 11a, thereby reducing the probability of debris affecting the performance of the battery cell.

[0044] In some embodiments, see Figures 6 to 8 The first mounting groove 12a has a first wall 12b facing the first groove 12c, and the second protrusion 31 has a second wall 31a away from the second groove 12a. The first wall 12b and the second wall 31a are tightly matched so that the chemical forming nail 30 can be matched with the cover plate 10 and the chemical forming nail 30 can seal the first through hole 11a on the cover plate 10.

[0045] In this specific embodiment, the second protrusion 31 and the first mounting groove 12a are interference-fitted. During the interference-fit process, the first wall surface 12b and the second wall surface 31a will rub against each other, and the first wall surface 12b is located on the side of the first mounting groove 12a away from the first through hole 11a, that is, the position where the friction occurs is also located on the side of the first mounting groove 12a away from the first through hole 11a. Therefore, the debris generated by the friction can enter the first groove 12a more smoothly, and avoid entering the battery cell through the first through hole 11a.

[0046] In some specific embodiments of the present application, an elastic sealing ring is provided on the second protrusion 31, and the gap between the first wall 12b and the second wall 31a is sealed by the elastic sealing member to improve the sealing performance of the chemical nail 30 to seal the first through hole 11a.

[0047] It is understandable that in order to achieve an interference fit between the chemical nail 30 and the injection hole 50a, the material of the chemical nail 30 needs to have a certain hardness. In order to expand the range of materials that can be used for the sealing component 60 and reduce the cost of the sealing component 60, in some specific embodiments of the present application, see Figures 6 to 8 The first wall surface 12b and the second wall surface 31a are provided with threads that can cooperate with each other. That is to say, the first wall surface 12b and the second wall surface 31a cooperate with each other through threads, and since the thread cooperation has fewer requirements on materials, the range of materials that can be used to manufacture the chemical nail 30 and the cover plate 10 is expanded, which is conducive to reducing costs; in addition, the process of processing threads is simple and convenient, which can further reduce costs.

[0048] In addition, when the first wall surface 12b and the second wall surface 31a cooperate with each other through threads, the thread teeth and the thread grooves on the first wall surface 12b and the second wall surface 31a can correspond to each other to achieve a tight fit between the first wall surface 12b and the second wall surface 31a; at the same time, the gap between the first wall surface 12b and the second wall surface 31a can be reduced, thereby improving the sealing performance of the first through hole 11a sealed by the formation nail 30, and reducing the probability of the fluid entering and exiting the battery cell through the first through hole 11a.

[0049] It can be understood that less debris is generated during the threaded engagement process, which is beneficial to reducing the debris generated by friction when the formation nail 30 is installed on the cover plate 10 and removed from the cover plate 10.

[0050] Under some working conditions, the fluid inside the battery cell may flow along the gap between the second protrusion 31 and the first groove 12a, which may adversely affect the formation nail 30 and the cover plate 10. Therefore, in order to reduce the adverse effect of the fluid inside the battery flowing in the gap between the second protrusion 31 and the first groove 12a on the formation nail 30 and the cover plate 10, it is necessary to further seal the gap between the second protrusion 31 and the first groove 12a.

[0051] Based on the above considerations, in some embodiments, see Figures 5 to 8 The first protruding member 20 has a third wall surface 21a facing the first groove 12c, and the second protruding member 31 has a fourth wall surface 32b facing the second groove 32a. The third wall surface 21a is sealed and abutted against the fourth wall surface 32b to reduce the gap between the second protruding member 31 and the first protruding member 20, thereby improving the sealing performance of the first through hole 11a sealed by the formation nail 30, so that on the one hand, the probability of external fluid entering the battery monomer through the first through hole 11a is reduced to reduce the adverse effect of the external fluid on the battery monomer; on the other hand, it can also reduce the probability of the fluid inside the battery flowing into the gap between the second protruding member 31 and the first protruding member 20, so as to reduce the adverse effects of the internal fluid of the battery on the formation nail 30 and the cover plate 10, such as corrosion.

[0052] In some embodiments, see Figure 6 and Figure 7 The surface of the cover plate 10 along the thickness direction of the cover plate 10 protrudes beyond the surface of the first protrusion 20 along the thickness direction of the cover plate 10, so that the cover plate 10 can block some external dust and other debris from entering the first through hole 11a, reducing the probability of debris entering the battery cell through the first through hole 11a; at the same time, reducing the direct contact and friction between the first protrusion 20 and the outside world, thereby improving the durability of the first protrusion 20.

[0053] In some embodiments, see Figure 5The bottom wall of the second groove 32a is sealed against the first protrusion 20 to seal the first through hole 11a. In other words, the surface of the first protrusion 20 along the thickness direction of the cover plate 10 abuts against the surface of the second groove 32a along the thickness direction of the cover plate 10, thereby making the first protrusion 20 abut against the second groove 32a along the thickness direction of the cover plate 10.

[0054] In this way, the gap between the first protrusion 20 and the second groove 32a can be reduced, thereby further improving the sealing performance of the formation nail 30 sealing the first through hole 11a, and reducing the probability of external fluid entering the battery cell; at the same time, it is also beneficial to reduce the probability of the fluid inside the battery flowing into the gap between the second protrusion 31 and the first groove 12a, thereby reducing the adverse effects of the fluid inside the battery on the formation nail 30 and the cover plate 10, such as corrosion.

[0055] Further, see Figure 5 , the second protrusion 31 abuts against the first groove 12a along the thickness direction of the cover plate 10 to seal the first through hole 11a. That is, the surface of the second protrusion 31 along the thickness direction of the cover plate 10 abuts against the surface of the first groove 12a along the thickness direction of the cover plate 10, so that the second protrusion 31 abuts against the first groove 12a along the thickness direction of the cover plate 10.

[0056] In this way, the gap between the first protrusion 20 and the second groove 32a is reduced, so as to further improve the sealing performance of the formation nail 30 sealing the first through hole 11a, and reduce the probability of external fluid entering the interior of the battery.

[0057] In some embodiments, see Figures 5 to 8 The shape of the second protrusion 31 is suitable for the first groove 12a, and the second protrusion 31 and the first groove 12a are interference fit. In this way, it is convenient for the second protrusion 31 to be inserted into the first groove 12a, thereby reducing the gap between the second protrusion 31 and the inner wall of the first groove 12a, so as to further improve the sealing performance of the formation nail 30 sealing the first through hole 11a, and reduce the probability of external fluid entering the battery; at the same time, it is also conducive to reducing the probability of the fluid inside the battery flowing into the gap between the second protrusion 31 and the first groove 12a, and reducing the adverse effects of the fluid inside the battery on the formation nail 30 and the cover plate 10, such as corrosion.

[0058] In some embodiments, a second mounting groove 13a is further provided on the cover plate 10, and the inner diameter of the second mounting groove 13a is larger than the inner diameter of the first mounting groove 12a to improve the visibility of the second mounting groove 13a, thereby facilitating the assembly of the chemical formation nail 30 with the cover plate 10. In addition, the second mounting groove 13a can accommodate debris to reduce the probability of debris entering the first through hole 11a; the bottom wall of the second mounting groove 13a is connected to the first mounting groove 12a, so that a step portion 14 is formed between the first mounting groove 12a and the second mounting groove 13a; a third groove 34a is formed between the nail body 33 and the surface of the second protrusion 31 facing away from the second groove 32a, and the step portion 14 is accommodated in the third groove 34a to improve the tightness of the matching between the chemical formation nail 30 and the cover plate 10 and reduce the probability of the chemical formation nail 30 falling off the cover plate 10.

[0059] In some specific embodiments of the present application, the stepped portion 14 and the surfaces facing each other of the third groove 34a fit tightly together to improve the sealing performance; at the same time, the nail body 33 can block debris in the second mounting groove 13a from entering the first mounting groove 13a in all directions of the first mounting groove 13a, so as to reduce the probability of debris entering the battery cell through the first mounting groove 13a and the first through hole 11a, thereby reducing the adverse effects of debris on the performance of the battery cell.

[0060] In some embodiments, see Figures 5 to 7 The step portion of the step portion 14 is chamfered. It can be understood that the step portion of the step portion 14 refers to the intersection of two mutually intersecting wall surfaces of the step portion 14.

[0061] Thus, the chamfer 121 is formed at the step, which can guide the formation nail 30 to be assembled on the cover plate 10, so that the friction between the formation nail 30 and the cover plate 10 is reduced when they are assembled, thereby reducing the debris generated between the formation nail 30 and the cover plate 10 during assembly.

[0062] The sealing assembly in some embodiments of the present application is implemented as follows, see Figures 2 to 8The sealing assembly 60 includes a cover plate 10, a first protruding member 20 and a forming nail 30. The cover plate 10 is provided with a first mounting groove 12a. A first through hole 11a is formed on the bottom wall of the first mounting groove 12a along the thickness direction of the cover plate 10. The first protruding member 20 is arranged at the periphery of the first through hole 11a and defines a first groove 12c with the side wall of the first mounting groove 12a. The first protruding member 20 is a closed ring structure arranged around the periphery of the first through hole 11a. The chemical nail 30 includes a nail body 33 and a second protrusion 31. The second protrusion 31 protrudes from the surface of the nail body 33 facing the first through hole 11a, and the second protrusion 31 itself encloses a second groove 32a; the first mounting groove 12a has a first wall surface 12b facing the first groove 12c, and the second protrusion 31 has a second wall surface 31a away from the second groove 32a. The first wall surface 12b and the second wall surface 31a are provided with threads that can cooperate with each other.

[0063] During the process of the formation nail 30 and the cover plate 10 being matched, the second protrusion 31 is screwed into the first installation groove 12a through the mutually matching threads on the first wall surface 12b and the second wall surface 31a, so that the formation nail 30 and the cover plate 10 are detachably matched. At least the following beneficial effects are achieved: the threads provided on the first wall surface 12c and the second wall surface 12b can facilitate the connection and disassembly of the formation nail 30 and the cover plate 10, reduce the debris generated when the formation nail 30 and the cover plate 10 are matched, and improve the sealing performance; the first protrusion 20 blocks the debris in the first through hole 11a from entering the first through hole 11a, further reducing the influence of the debris on the battery cell; the first groove 12c provided on the outer periphery of the first through hole 11a accommodates the debris generated when the cover plate 10 and the formation nail 30 are matched, reducing the probability of the debris entering the battery cell through the first through hole 11a.

[0064] When the chemical forming nail 30 is matched on the cover plate 10, the first protrusion is at least partially accommodated in the second groove 32a, and the bottom wall of the second groove 32a is covered on the first through hole 11a, and the second protrusion 31 is detachably accommodated in the first groove 12c. It has at least the following beneficial effects: the third wall surface 21a is sealed and abutted with the fourth wall surface 32b, and the bottom wall of the second groove 32a is sealed and abutted with the first protrusion 20 to further seal the first through hole 11a. The sealing of the chemical forming nail 30 and the cover plate 10 when they are matched is further improved by the sealing abutment between the third wall surface 21a and the fourth wall surface 32b; the sealing is further improved by the sealing abutment between the first protrusion 20 and the bottom wall of the second groove 32a;

[0065] In addition, the cover plate 10 is provided with a second mounting groove 13a, the inner diameter of which is greater than the inner diameter of the first mounting groove 12a, and the bottom wall of which is connected to the first mounting groove 12a, so that a step portion 14 is formed between the first mounting groove 12a and the second mounting groove 13a; a third groove 34a is formed between the nail body 33 and the surface of the second protrusion 31 facing away from the second groove 32a, and the step portion 14 is accommodated in the third groove 34a. The surfaces of the step portion 14 and the third groove 34a facing each other are closely fitted. The step portion of the step 14 is chamfered. The close fit between the surfaces of the step portion 14 and the third groove 34a facing each other improves the sealing performance, and helps the nail body 33 to block the debris in the second mounting groove 13a from entering the battery cell through the first through hole 11a; the chamfer 121 is formed at the step portion, which helps to reduce the debris generated between the formation nail 30 and the cover plate 10 during assembly.

[0066] An embodiment of the present application provides a battery cell, which includes a shell and any one of the sealing components 60 described above, wherein the sealing component 60 is sealed to the shell.

[0067] The battery cell provided in the embodiment of the present application, through the sealing assembly 60, is conducive to reducing the probability of debris entering the battery cell while meeting the sealing requirements and reducing the impact of fluid entering and exiting the battery cell on the performance of the battery cell, thereby helping to reduce the probability of debris affecting the performance of the battery cell.

[0068] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0069] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A sealing assembly, It is characterized in that The sealing assembly comprises: A cover plate, on which a first mounting groove is formed, and a first through hole is formed on a bottom wall of the first mounting groove along a thickness direction of the cover plate; A first protrusion is disposed on the outer periphery of the first through hole and defines a first groove with the side wall of the first mounting groove; and A chemical nail is detachably mounted on the cover plate; the chemical nail comprises a nail body and a second protrusion, the second protrusion is formed on the surface of the nail body facing the first through hole, and the second protrusion itself is enclosed to form a second groove; When the chemically formed nail is fitted in the first installation groove, the first protrusion is at least partially accommodated in the second groove, and the bottom wall of the second groove covers the first through hole, and the second protrusion is detachably accommodated in the first groove.

2. The sealing assembly according to claim 1, It is characterized in that The first installation slot has a first wall surface facing the first groove, the second protrusion has a second wall surface facing away from the second groove, and the first wall surface is tightly matched with the second wall surface.

3. The sealing assembly according to claim 2, It is characterized in that The first wall surface and the second wall surface are provided with threads that can cooperate with each other.

4. The sealing assembly according to claim 1, It is characterized in that The first protrusion has a third wall surface facing the first groove, the second protrusion has a fourth wall surface facing the second groove, and the third wall surface is in sealing contact with the fourth wall surface.

5. The sealing assembly according to claim 1, It is characterized in that The bottom wall of the second groove is sealingly abutted against the first protrusion to seal the first through hole.

6. The sealing assembly according to claim 1, It is characterized in that The cover plate is further provided with a second mounting groove, the inner diameter of the second mounting groove is larger than the inner diameter of the first mounting groove, and the bottom wall of the second mounting groove is connected to the first mounting groove, so that a step portion is formed between the first mounting groove and the second mounting groove; Wherein, a third groove is formed between the nail body and the surface of the second protrusion facing away from the second groove, and the step portion is accommodated in the third groove.

7. The sealing assembly according to claim 6, It is characterized in that The stepped portion and the third groove are in close contact with each other on surfaces facing each other.

8. The sealing assembly according to claim 6, It is characterized in that The step portion of the step portion is chamfered.

9. The sealing assembly according to claim 1, It is characterized in that The first protrusion is a closed ring structure arranged around the outer periphery of the first through hole.

10. A battery cell, It is characterized in that It comprises a shell and the sealing assembly according to any one of claims 1 to 9, wherein the sealing assembly is sealed to the shell.

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