Sealing glue nail assembly, cover plate, single battery, battery module and battery pack

Abstract

The utility model provides a sealing glue nail assembly, a cover plate, a single battery, a battery module and a battery pack, and relates to the technical field of batteries. When the sealing rubber nail assembly is applied to seal the liquid injection hole of the single battery, the rubber nail body of the sealing rubber nail of the sealing rubber nail assembly can be inserted into the liquid injection hole firstly, and then the convex part of the sealing nail penetrates through the wall part of the rubber nail body. After helium is injected into the liquid injection hole, even if the sealing rubber nail is inserted into the liquid injection hole, the convex part of the sealing nail penetrating through the sealing rubber nail weakens or relieves the sealing effect of the sealing rubber nail on the liquid injection hole through the penetration of the convex part on the wall part, so that after the sealing nail is connected with the single battery in a welding manner, the sealing effect of the sealing rubber nail on the liquid injection hole is reduced. When helium detection is carried out, interference on helium detection of the sealing nail caused by the sealing performance of the sealing rubber nail can be eliminated, so that the sealing performance of the connection position between the sealing nail and the single battery after the sealing nail is connected with the single battery can be effectively verified, and the reliability of helium detection is further improved.

Description

Technical Field

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

[0002] The cylindrical battery injection assembly is generally composed of an injection hole, a sealing nail and a sealing aluminum sheet. The injection hole is used to inject electrolyte, and the electrolyte can enter the battery cell through the injection hole. The sealing nail is set to prevent impurities from entering the battery through the injection hole. The sealing aluminum sheet is further sealed by laser welding. After welding, the battery will be tested for helium leakage to ensure the sealing of the battery.

[0003] In the prior art, during the battery manufacturing process, poor welding between the sealing pins and the top cover may cause leakage of the battery cell, thereby affecting the safety of the battery cell. In order to detect the sealing performance of the battery cell top cover and the sealing pins, a helium inspection process is introduced.

[0004] However, the existing technology is to first inject helium, then insert the sealing nails, then laser weld the sealing nails, and finally perform a helium inspection process to detect whether the battery cell is leaking. However, since the sealing nails are first inserted into the welding position of the sealing nails, the sealing nails can better seal the liquid injection port in a short time, resulting in the helium inspection process affecting the judgment of the sealing of the welding point due to the sealing nails. Utility Model Content

[0005] In view of this, the present application provides a sealing nail assembly, a cover plate, a single cell, a battery module and a battery pack, the purpose of which is to solve the above technical problems to a certain extent.

[0006] In a first aspect, the present application provides a sealing nail assembly, which is used to seal a liquid injection hole of a single battery, and the sealing nail assembly includes:

[0007] A sealing glue nail, wherein the sealing glue nail comprises a glue nail body for inserting into the injection hole, wherein the glue nail body comprises a wall portion, and the wall portion is used to seal the injection hole;

[0008] A sealing nail, the sealing nail comprising a sealing nail body and a convex portion, the sealing nail body comprising a first surface, the convex portion protruding from the first surface to a side away from the sealing nail body;

[0009] There is a gap between the first surface and the wall portion, and the convex portion penetrates the wall portion.

[0010] Preferably, the convex portion has a hollow structure so that the convex portion has a cavity, the cavity has an opening on a side of the convex portion facing away from the first surface, the convex portion further has a plurality of through holes provided on the convex portion, and at least some of the plurality of through holes are located in the gap.

[0011] Preferably, some of the plurality of through holes are also located inside the glue nail body.

[0012] Preferably, the sealing nail body includes a side portion facing the sealing glue nail, the sealing nail body further includes a concave portion recessed from the side portion in a direction away from the sealing glue nail, and the first surface is formed as the bottom of the concave portion;

[0013] The sealing glue nail further includes an extension portion, the extension portion is connected to a side of the glue nail body away from the sealing nail, and the extension portion is located inside the single cell;

[0014] Wherein, the sealing glue nail has a hollow portion, the hollow portion is open on a side of the extension portion away from the glue nail body, and the hollow portion terminates at the wall portion;

[0015] The cross-sectional area of the extension portion is smaller than the cross-sectional area of the glue nail body;

[0016] Wherein, the cross-sectional area of the end of the extension portion gradually decreases from the side where the glue nail body is located to the side where the battery is located.

[0017] Preferably, the thickness of the wall portion is 0.2 mm - 0.5 mm.

[0018] In a second aspect, the present application provides a cover plate, and the cover plate includes the sealing glue nail assembly as described above.

[0019] Preferably, the cover plate has a recessed structure, a liquid injection hole is provided at the bottom of the recessed structure, the sealing nail body is disposed in the recessed structure, and an outer side portion of the sealing nail body is connected to an inner side portion of the recessed structure.

[0020] In a third aspect, the present application provides a single cell, and the single cell includes the sealing glue nail assembly as described above, or the single cell includes the cover plate as described above.

[0021] In a fourth aspect, the present application provides a battery module, and the battery module includes a plurality of the single cells as described above.

[0022] In a fifth aspect, the present application provides a battery pack, and the battery pack includes a plurality of the single cells as described above, or the battery pack includes the battery module as described above.

[0023] According to the sealant nail assembly provided by the present application, when the sealant nail assembly is applied to seal the liquid injection hole of a single battery, the nail body of the sealant nail of the sealant nail assembly can be first inserted into the liquid injection hole, and then the convex portion of the seal nail penetrates through the wall portion of the nail body. In this way, at the end of liquid injection, after injecting helium gas into the liquid injection hole, even if the sealant nail is inserted into the liquid injection hole, the convex portion of the seal nail that subsequently penetrates through the sealant nail will weaken or release the sealing effect of the sealant nail on the liquid injection hole through the penetration of the convex portion through the wall portion. Thus, after the seal nail and the single battery are connected by a method such as welding, during helium leak detection, different from the prior art, the sealant nail assembly provided by the present application can eliminate the interference of the sealing performance of the sealant nail on the helium leak detection of the seal nail. Therefore, the sealing performance of the connection position between the seal nail and the single battery after connection can be effectively verified, and the reliability of helium leak detection is further improved.

[0024] To make the above objects, features, and advantages of the present application more obvious and understandable, the following specifically gives preferred embodiments and, in conjunction with the accompanying drawings, the detailed description is as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] To more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings required to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application and should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0026] Figure 1 A schematic diagram showing a cross-sectional view of a single battery provided by an embodiment of the present application;

[0027] Figure 2 Showing Figure 1 A schematic diagram of a partial view at A therein;

[0028] Figure 3 A schematic diagram showing a cross-sectional view of a seal nail provided by an embodiment of the present application;

[0029] Figure 4 A schematic diagram showing a cross-sectional view of a sealant nail provided by an embodiment of the present application.

[0030] REFERENCE NUMERALS:

[0031] 100 - Sealant nail; 110 - Nail body; 111 - Wall portion; 120 - Extension portion; 121 - Tapered section; 130 - Hollow portion; 200 - Sealing nail; 210 - Sealing nail body; 220 - Protrusion; 221 - Cavity; 222 - Opening; 223 - Through hole; 230 - Recess; 231 - First surface; 300 - Gap; 400 - Cover plate; 410 - Cover plate body; 420 - Concave structure; 500 - Monoblock battery. Detailed implementation manners

[0032] The technical solutions of the present application will be described clearly and completely below with reference to the accompanying drawings. Apparently, the described embodiments are some but not all of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art without creative efforts based on the embodiments in the present application belong to the scope of protection of the present application.

[0033] In the description of the present application, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0034] In the description of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", "connection" 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 directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0035] In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present application.

[0036] According to the first aspect of the embodiments of the present application, a sealant nail assembly is provided. The following will be combined with Figures 1 to 4 Specifically describe the structure and working principle of the sealant nail assembly.

[0037] According to an embodiment of the present application, a sealing nail assembly is provided, which is used to seal the injection hole of a single battery 500, and the sealing nail assembly includes a sealing nail 100 and a sealing nail 200. In the embodiment, the sealing nail 100 includes a nail body 110 for inserting into the injection hole, and the nail body 110 includes a wall portion 111, and the wall portion 111 is used to seal the injection hole.

[0038] In the embodiment, the sealing nail 200 includes a sealing nail body 210 and a convex portion 220. The sealing nail body 210 includes a first surface 231. The convex portion 220 protrudes from the first surface 231 to a side away from the sealing nail body 210. In the embodiment, a gap 300 is provided between the first surface 231 and the wall portion 111, and the convex portion 220 penetrates the wall portion 111.

[0039] In this way, according to the sealing nail assembly provided in the embodiment of the present application, when the sealing nail assembly is used to close the liquid injection hole of the single cell 500, the nail body 110 of the sealing nail 100 of the sealing nail assembly can be inserted into the liquid injection hole first, and then the protrusion 220 of the sealing nail 200 can be used to penetrate the wall 111 of the nail body 110.

[0040] Thus, when the injection is completed, after helium is injected into the injection hole, even if the sealant nail 100 is inserted into the injection hole, the convex portion 220 of the sealant nail 200 that subsequently penetrates the sealant nail 100 will weaken or release the sealing effect of the sealant nail 100 on the injection hole through the penetration of the wall portion 111 by the convex portion 220. Therefore, after the sealant nail 200 is connected to the single cell 500 by a method such as welding, when the helium test is performed, unlike the prior art, the sealant nail assembly provided according to the embodiment of the present application can eliminate the interference of the sealing performance of the sealant nail 100 on the helium test of the sealant nail 200, so that the sealing performance of the connection position between the sealant nail 200 and the single cell 500 after the sealant nail 200 is connected to the single cell 500 can be effectively verified, thereby improving the reliability of the helium test.

[0041] In the embodiment, as an example, Figures 2 to 4 As shown, in the embodiment, Figure 2 It is shown in Figure 1 A schematic diagram of a partial view based on a cross-sectional view, Figure 2 The state and matching relationship of the sealant nail assembly when used in the single battery 500 are emphasized. In other words, Figure 2 The sealant nail assembly shown in FIG. 1 is already installed in the single battery 500. On this basis, Figure 3 and Figure 4 A schematic diagram of a cross-sectional view of a separate sealing nail 200 and a schematic diagram of a cross-sectional view of a separate sealing glue nail 100 are respectively given to illustrate the cross-sectional view of the sealing nail 200. Figure 2Collectively describe the sealant nail assembly provided according to the embodiments of the present application.

[0042] In an embodiment, referring to Figures 2 to 4 , by way of example, the nail body of the sealant nail 100 may be, for example, a cylindrical structure. Similarly, the seal nail body 210 may be, for example, a disc-shaped structure, and the convex portion 220 provided on the seal nail body 210 may also be, for example, a cylindrical structure.

[0043] In an embodiment, by way of example, the sealant nail 100 may be formed of an elastic material such as rubber, and the seal nail 200 may be formed of the same material as the outer shell of the single cell 500. For example, the seal nail 200 assembly provided according to the embodiments of the present application may be connected to the cover plate 400 of the single cell 500, that is, a liquid injection hole may be formed on the cover plate 400. The specific structure of the liquid injection hole on the cover plate 400 will be described in the subsequent description of the cover plate 400. By way of example, the cover plate 400 may be formed of a metal material such as aluminum. Therefore, by way of example, the seal nail 200 may be formed of aluminum. In addition, by way of example, the seal nail body 210 and the convex portion 220 may be an integrally formed structure.

[0044] In an embodiment, the nail body 110 of the sealant nail 100 may be inserted into the liquid injection hole and form a fit with the liquid injection hole in an interference fit manner. As Figure 2 shown, in an embodiment, taking the orientation in Figure 2 as an example, the liquid injection hole may be, for example, a cylindrical hole. Therefore, the extending direction of the liquid injection hole is the axial direction of the liquid injection hole. In Figure 2 , this axial direction is the vertical direction. In an embodiment, the wall portion 111 included in the nail body may be perpendicular to the aforementioned axial direction in the extending manner, and the wall portion 111 directly functions to seal the liquid injection hole.

[0045] In an embodiment, the wall portion 111 is penetrated by the convex portion 220 on the seal nail body 210, that is, the convex portion 220 passes through the wall portion 111, so that the wall portion 111 is sleeved outside the convex portion 220. In this way, the integrity of the wall portion 111 is damaged by the convex portion 220, and the sealing effect on the liquid injection hole is reduced or the sealing effect is released, so that the helium gas inside the single cell 500 can flow into the gap 300 between the first surface 231 of the seal nail body 210 and the wall portion 111 through the liquid injection hole. Therefore, the sealing of this part of the helium gas in the gap 300 depends on the sealing performance at the connection between the seal nail body 210 and the cover plate 400 (specifically, the cover plate main body 410) of the single cell 500.

[0046] Therefore, if helium is detected outside the single cell 500, it can be verified that the sealing performance at the connection between the sealing nail body 210 and the single cell 500 is poor. On the contrary, it can be at least confirmed that the sealing performance of the sealing nail body 210 meets the requirements in helium leak detection.

[0047] According to the sealing glue nail assembly provided by the embodiment of the present application, the convex portion 220 can be a hollow structure, so that the convex portion 220 has a cavity 221. The cavity 221 can have an opening 222 on a side of the convex portion 220 facing away from the first surface 231. The convex portion 220 further has a plurality of through holes 223 provided on the convex portion 220, and at least some of the plurality of through holes 223 are located in the gap 300.

[0048] Thus, according to the sealing glue nail assembly provided by the embodiment of the present application, since the wall portion 111 functions to seal the liquid injection hole, once the convex portion 220 of the sealing nail 200 penetrates the wall portion 111, the end of the convex portion 220 of the sealing nail 200 is exposed to the atmosphere of helium. Due to the opening 222 at the end of the convex portion 220 of the sealing nail 200, helium can enter the internal cavity 221 of the convex portion 220 of the sealing nail 200 through the opening 222, and further enter the gap 300 through at least some of the plurality of through holes 223. Thus, by using the hollow convex portion 220 setting method and the through holes 223 for conducting helium, the amount of helium entering the gap 300 can be greatly increased, thereby further eliminating the interference of the sealing effect of the sealing glue nail 100 on helium leak detection.

[0049] In an embodiment, by way of example, the convex portion 220 can be, for example, a cylindrical structure. Since the convex portion 220 pierces the wall portion 111, the convex portion 220 is substantially formed as a thimble structure in the sealing nail 200. In the embodiment, the through holes 223 can be opened on the side wall of the convex portion 220, and the extending direction of the through holes 223 can be, for example, the radial direction of the convex portion 220.

[0050] As Figure 3 shown, the through holes 223 can be arranged in multiple groups along the axial direction of the convex portion 220, which is also the axial direction of the liquid injection hole. Each group of through holes 223 can include a plurality of through holes 223 arranged at intervals along the circumferential direction of the convex portion 220. By way of example, each group of through holes 223 can include, for example, 2, 4, 6 or even more through holes 223, and the number of groups of through holes 223 can be, for example, 1 group, 2 groups, 3 groups, 4 groups or even more groups.

[0051] According to the sealing glue nail assembly provided by the embodiment of the present application, some of the plurality of through holes 223 are also located inside the glue nail body 110. This example is in Figure 2As shown, in the embodiment, the through-hole 223 in this part located inside the glue nail body 110 can substantially conduct the gap between the outer side of the convex part 220 and the inner side of the glue nail body 110, which is also conducive to reducing the sealing performance of the sealing glue nail 100.

[0052] According to the sealing glue nail assembly provided by the embodiment of the present application, the sealing nail body 210 may include a side portion facing the sealing glue nail 100. The sealing nail body 210 may further include a recess 230 recessed from the side portion in a direction away from the sealing glue nail 100, and the first surface 231 is formed as the bottom of the recess 230.

[0053] In the embodiment, the gap 300 between the first surface 231 and the wall portion 111 mentioned in the above description is substantially served by the depth of the recess 230. In the embodiment, when the sealing nail body 210 is installed on the cover plate body 410, the sealing nail body 210 is equivalent to being "buckled" on the cover plate body 410. The portion of the side portion of the sealing nail body 210 where the recess 230 is not formed naturally abuts against the cover plate body 410, thus forming the above-mentioned gap 300. Therefore, adding an additional component between the cover plate body 410 and the sealing nail body 210 to create the gap 300 is beneficial to simplifying the structure of the sealing glue nail assembly and the cover plate 400.

[0054] As an example, the bottom of the recess 230, that is, the first surface 231, can be, for example, a circular surface coaxial with the convex part 220, and the inner side portion of the recess 230 can be, for example, an inner cylindrical surface coaxial with the convex part 220.

[0055] According to the sealing glue nail assembly provided by the embodiment of the present application, the sealing glue nail 100 may further include an extension portion 120. The extension portion 120 may be connected to the side of the glue nail body away from the sealing nail 200, and the extension portion 120 may be located inside the single battery 500.

[0056] In the embodiment, the sealing glue nail 100 may have a hollow portion 130. The hollow portion 130 may be open on the side of the extension portion 120 away from the glue nail body, and the hollow portion 130 may terminate at the wall portion 111.

[0057] In the embodiment, the setting of the extension portion 120 is beneficial to first insert the extension portion 120 into the liquid injection hole to guide the glue nail body to be inserted into the liquid injection hole. In the embodiment, the extension portion 120 has a hollow portion 130 throughout the entire length in the above-mentioned axial direction. The hollow portion 130 further extends upward, that is, toward the side where the sealing nail 200 is located, which is equivalent to hollowing out a part of the glue nail body and then terminating at the wall portion 111. In this way, even if the extension portion 120 is provided, helium gas is allowed to flow into the above-mentioned gap 300 through the hollow portion 130.

[0058] According to the sealant nail assembly provided by the embodiments of the present application, the cross-sectional area of the extension portion 120 is smaller than the cross-sectional area of the nail body. That is to say, the extension portion 120 can be thinner than the nail body. For example, the extension portion 120 can also be in a columnar structure, and its maximum diameter can be not only smaller than the nail body, but also smaller than the inner diameter of the liquid injection hole. Thus, the extension portion 120 can be relatively easily inserted into the liquid injection hole, and then guide the process of inserting the nail body into the liquid injection hole in the way of entering the liquid injection hole first.

[0059] According to the sealant nail assembly provided by the embodiments of the present application, the cross-sectional area of the end of the extension portion 120 can gradually decrease from the side where the nail body is located to the side where the battery is located.

[0060] In an embodiment, as an example, the end of the extension portion 120 can be formed into a tapered section 121 with a gradually decreasing diameter downward, so that the tapered section 121 can be used to guide the extension portion 120 to be inserted into the liquid injection hole faster.

[0061] In an embodiment, the wall portion 111 of the sealant nail 100 can have a thickness of, for example, 0.2 mm - 0.5 mm (i.e., the dimension in the axial direction), and the thickness of the wall portion 111 can be, for example, 0.2 mm, 0.3 mm, 0.4 mm, or 0.5 mm. In an embodiment, if the thickness of the wall portion 111 is too small, it may be not conducive to the manufacture of the sealant nail 100. If the thickness of the wall portion 111 is too large, it may be not conducive to the protrusion 220 of the seal nail 200 to penetrate through.

[0062] According to the sealant nail assembly provided by the embodiments of the present application, the sealant nail 100 is in interference fit with the liquid injection hole, and the seal nail 200 pierces through the sealant nail 100 and is welded and sealed with the cover plate main body 410. The thimble of the seal nail 200 can be hollowed out, and a through hole 223 is left for the helium to flow through. The sealant nail 100 can be made of rubber material, and the middle part can be hollowed out, and only the wall portion 111 with a thickness of 0.2 - 0.5 mm is left for sealing the liquid injection hole.

[0063] Thus, according to the sealant nail assembly provided by the embodiments of the present application, the sealing effect of the seal nail 200 can be effectively verified. Specifically, after placing the seal nail 200 and piercing through the sealant nail 100, the sealing property of the sealant nail 100 is damaged, so that the helium flows through the thimble of the seal nail 200. This not only avoids impurities from entering the interior of the single cell 500 through the liquid injection hole, but also makes the sealing effect of the battery core verified by helium detection (i.e., the sealing effect between the seal nail 200 and the cover plate main body 410) more accurate and reliable.

[0064] According to the second aspect of the embodiments of the present application, a cover plate 400 is provided. The cover plate 400 includes the above sealant nail assembly and also has the above beneficial effects, which will not be repeated here.

[0065] According to the cover plate 400 provided by the embodiments of the present application, the cover plate 400 may have a recessed structure 420. A liquid injection hole may be provided at the bottom of the recessed structure 420. The sealing nail body 210 may be disposed in the recessed structure 420. The outer side portion of the sealing nail body 210 is connected to the inner side portion of the recessed structure 420, for example, connected by the welding method described above.

[0066] According to the third aspect of the embodiments of the present application, a single cell 500 is provided. The single cell 500 includes the above sealing glue nail assembly, or the single cell 500 may include the above cover plate 400. Therefore, the single cell 500 also has the above beneficial effects, which will not be elaborated here. The single cell 500 may be, for example, a cylindrical battery.

[0067] According to the fourth aspect of the embodiments of the present application, a battery module is provided. The battery module includes a plurality of the above single cells 500 and also has the above beneficial effects, which will not be elaborated here. The plurality of batteries may be arranged in an array to form a battery module.

[0068] According to the fifth aspect of the embodiments of the present application, a battery pack is provided. The battery pack includes a plurality of the above single cells 500, or the battery pack includes the above battery module and also has the above beneficial effects, which will not be elaborated here. In the embodiment, the battery pack is, for example, a structure in which a plurality of batteries are directly packaged, that is, a CTP (Cell To Pack) structure. In addition, in the embodiment, another example of the battery pack is to package on the basis of the above battery module.

[0069] The above are only the preferred embodiments of the present application, and do not limit the protection scope of the present application. Any equivalent structural transformation made by using the specification and drawings of the present application under the innovative concept of the present application, or directly / indirectly applied in other related technical fields are included in the protection scope of the present application.

Claims

1. A sealant nail assembly, characterized in that, The sealant nail assembly is used to seal the liquid injection hole of a single cell, and the sealant nail assembly includes: A sealant nail, the sealant nail includes a nail body for inserting into the liquid injection hole, the nail body includes a wall portion, and the wall portion is used to seal the liquid injection hole; A sealing nail, the sealing nail includes a sealing nail body and a convex portion, the sealing nail body includes a first surface, and the convex portion protrudes from the first surface to the side away from the sealing nail body; Wherein, there is a gap between the first surface and the wall portion, and the convex portion penetrates through the wall portion.

2. The sealant nail assembly according to claim 1, characterized in that, The convex portion is a hollow structure, so that the convex portion has a cavity, the cavity has an opening on the side of the convex portion away from the first surface, and the convex portion also has a plurality of through holes provided on the convex portion, and at least some of the plurality of through holes are located in the gap.

3. The sealant nail assembly according to claim 2, wherein, Some of the plurality of through holes are also located inside the nail body.

4. The sealant nail assembly according to claim 1, characterized in that, The sealing nail body includes a side portion facing the sealant nail, and the sealing nail body also includes a concave portion recessed from the side portion in a direction away from the sealant nail, and the first surface forms the bottom of the concave portion; The sealant nail further includes an extension portion, the extension portion is connected to the side of the nail body away from the sealing nail, and the extension portion is located inside the single cell; Wherein, the sealant nail has a hollow portion, the hollow portion is open on the side of the extension portion away from the nail body, and the hollow portion ends at the wall portion; The cross-sectional area of the extension portion is smaller than the cross-sectional area of the nail body; Wherein, the cross-sectional area of the end of the extension portion gradually decreases from the side where the nail body is located to the side where the battery is located.

5. The sealant nail assembly according to any one of claims 1 to 4, characterized in that, The thickness of the wall portion is 0.2 mm - 0.5 mm.

6. A cover plate, characterized in that, The cover plate includes the sealant nail assembly according to any one of claims 1 to 5.

7. The cover plate according to claim 6, characterized in that The cover plate has a concave structure, a liquid injection hole is provided at the bottom of the concave structure, the sealing nail body is arranged in the concave structure, and the outer side portion of the sealing nail body is connected to the inner side portion of the concave structure.

8. A single cell, characterized in that, The single cell includes the sealant nail assembly according to any one of claims 1 to 5, or the single cell includes the cover plate according to claim 6 or 7.

9. A battery module, characterized in that, The battery module includes a plurality of single cells according to claim 8.

10. A battery pack, characterized in that, The battery pack includes a plurality of single cells according to claim 8, or the battery pack includes the battery module according to claim 9.

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