Cover plate liquid injection hole sealing assembly, battery cover plate and battery

Abstract

The utility model relates to the technical field of batteries, in particular to a cover plate liquid injection hole sealing assembly, a battery cover plate and a battery. A mounting groove and a liquid injection through hole communicated with the mounting groove are formed in the battery cover plate from top to bottom in sequence in the height direction of the battery cover plate; the cover plate liquid injection hole sealing assembly comprises a first fastening component, a second fastening component and a sealing rubber plug, the first fastening component is mounted in the mounting groove, and the second fastening component is detachably connected with the first fastening component; a mounting through hole penetrating through the two ends of the first fastening component in the height direction of the first fastening component is formed in the first fastening component, the sealing rubber plug is connected with the first fastening component, and the sealing rubber plug extends into and is inserted into the liquid injection through hole through the mounting through hole and is used for sealing the liquid injection through hole. Therefore, the sealing assembly for the liquid injection hole of the cover plate belongs to a detachable structure, so that liquid can be supplemented into the shell of the battery at any time, the performance of the battery is ensured all the time, and the parts can be replaced at any time after being damaged, so that the resource waste is avoided.

Description

Technical Field

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

[0002] At present, aluminum shell batteries are sealed by laser welding process. If the sealing nail laser welding process fails, there is no effective means to repair the defective products, which reduces the battery yield and leads to increased manufacturing costs. Moreover, the structure is non-detachable, which makes it impossible to refill the interior of the aluminum shell battery, resulting in the battery being scrapped and unnecessary waste of resources. Utility Model Content

[0003] The purpose of the present application is to provide a cover plate liquid injection hole sealing assembly, a battery cover plate and a battery, which to a certain extent solves the technical problems existing in the prior art that the aluminum shell batteries all use a laser welding process to seal the liquid injection holes, and defective products cannot be repaired, and the interior of the aluminum shell battery cannot be refilled with liquid for the second time, resulting in the battery being scrapped and causing unnecessary waste of resources.

[0004] The present application provides a cover plate injection hole sealing assembly, which is applied to a battery cover plate, wherein the battery cover plate is formed with mounting grooves arranged sequentially from top to bottom along its height direction and injection through holes connected to the mounting grooves, and the cover plate injection hole sealing assembly comprises: a first fastening member, a second fastening member and a sealing rubber plug;

[0005] Among them, the first fastening member is installed in the installation groove, and the second fastening member and the first fastening member are detachably connected; the first fastening member is formed with installation through holes running through both ends thereof along its height direction, the sealing rubber plug is connected to the first fastening member, and the sealing rubber plug extends through the installation through holes to and is inserted into the liquid injection through hole for sealing the liquid injection through hole.

[0006] In the above technical solution, further, the second fastening member is threadedly connected to the first fastening member.

[0007] In any of the above technical solutions, further, the sealing rubber plug includes a sealing portion and a limiting portion; wherein the limiting portion is arranged on the side of the sealing portion; a forming hole and a limiting hole communicating with the forming hole are formed inside the second fastening member, and the limiting hole is arranged on the side of the forming hole;

[0008] The sealing part is arranged in the forming hole, and the lower end of the sealing part is inserted into the injection through hole through the forming hole and the installation through hole in sequence; the limiting part is arranged in the limiting hole.

[0009] In any of the above technical solutions, further, the sealing rubber plug is formed on the first fastening member by injection molding.

[0010] In any of the above technical solutions, further, the bottom end of the sealing rubber plug is provided with a draft angle, and is gradually tapered from top to bottom.

[0011] In any of the above technical solutions, further, a missing groove is provided at the bottom end of the sealing rubber plug.

[0012] In any of the above technical solutions, further, a hexagonal countersunk hole is provided on the top of the second fastening member.

[0013] In any of the above technical solutions, further, a limiting groove is provided on the top of the second fastening member, and the limiting groove is provided on the side portion of the hexagonal countersunk hole and is communicated with the hexagonal countersunk hole.

[0014] In any of the above technical solutions, further, at least a portion of the structure of the second fastening member is disposed in the mounting through hole, and the two are connected by threads.

[0015] In any of the above technical solutions, further, the first fastening component includes a connecting plate and a first mounting protrusion; wherein, the first mounting protrusion is arranged on the upper surface of the connecting plate; the mounting through holes are sequentially formed on the first mounting protrusion and the connecting plate; and the connecting plate is installed in the mounting groove.

[0016] In any of the above technical solutions, further, the second fastening member includes a cover plate and a second mounting protrusion; wherein the second mounting protrusion is arranged on the lower surface of the cover plate; and the sealing rubber plug is connected to the second mounting protrusion;

[0017] The second mounting protrusion is arranged in the mounting through hole and the two are threadedly connected; the cover plate is against the top of the first mounting protrusion, and a sealing ring is compressed between the cover plate and the first mounting protrusion.

[0018] In any of the above technical solutions, further, the first fastening member and the battery cover plate are connected by welding or a fastening member.

[0019] In any of the above technical solutions, further, the bottom end of the sealing plug extends through the injection hole to below the injection hole, and the height difference between the bottom surface of the sealing plug and the lower surface of the battery cover is 1-2 mm.

[0020] In any of the above technical solutions, further, the lower end surface of the second fastening member is higher than the bottom wall surface of the installation groove.

[0021] The present application also provides a battery cover, including the cover injection hole sealing assembly described in any of the above technical solutions, and thus has all the beneficial technical effects of the cover injection hole sealing assembly, which will not be repeated here.

[0022] In the above technical solution, further, the battery cover plate also includes a plain aluminum sheet and a lower plastic; wherein the lower plastic is arranged on the lower surface of the plain aluminum sheet; the plain aluminum sheet is formed with a mounting groove arranged in sequence from top to bottom along its height direction and a liquid injection through hole connected to the mounting groove, and the liquid injection through hole extends and passes through the lower plastic; the second fastening member is installed in the mounting groove; the sealing rubber plug is inserted into the liquid injection through hole to seal the liquid injection through hole.

[0023] The present application also provides a battery, comprising a shell and a battery cover as described in any of the above technical solutions, wherein an opening is formed at at least one end of the shell along its height direction, and the battery cover is installed at any of the openings. Therefore, the battery has all the beneficial technical effects of the battery cover, which will not be repeated here.

[0024] Compared with the prior art, the beneficial effects of this application are:

[0025] The present application provides a new type of cover plate liquid filling hole sealing assembly, which replaces the original laser welding sealing nail structure and is a detachable structure, so that liquid can be injected into the battery shell at any time to complete the liquid replenishment operation, which can always ensure the performance of the battery, and when the components are damaged, they can be replaced at any time. Especially when defective products appear, they can be repaired at any time, thereby avoiding waste of resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0027] Figure 1 An exploded view of a sealing assembly for a liquid injection hole of a cover plate provided in an embodiment of the present application;

[0028] Figure 2 A schematic structural diagram of a first fastening member provided in an embodiment of the present application;

[0029] Figure 3 An assembly diagram of the first fastening member and the battery cover provided in an embodiment of the present application;

[0030] Figure 4 A schematic diagram of the structure of a second fastening member provided in an embodiment of the present application;

[0031] Figure 5 Another structural schematic diagram of the second fastening member provided in an embodiment of the present application;

[0032] Figure 6 A cross-sectional view of a second fastening member provided in an embodiment of the present application;

[0033] Figure 7 A schematic diagram of the structure of the sealing rubber plug provided in an embodiment of the present application;

[0034] Figure 8 An assembly diagram of a first fastening member, a second fastening member, a sealing plug and a battery cover provided in an embodiment of the present application.

[0035] Reference numerals:

[0036] 1-battery cover, 11-plain aluminum sheet, 12-lower plastic, 13-installation groove, 14-liquid injection through hole, 15-protective protrusion, 2-first fastening member, 21-connecting plate, 22-first installation protrusion, 23-installation through hole, 24-annular groove, 3-second fastening member, 31-covering plate, 32-second installation protrusion, 321-molding hole, 322-limiting hole, 33-hexagonal countersunk hole, 34-limiting groove, 4-sealing plug, 41-sealing part, 411-missing groove, 42-limiting part, 5-sealing ring, 6-shell. DETAILED DESCRIPTION

[0037] The technical solution of the present application will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments.

[0038] The components of the embodiments of the present application generally described and shown in the drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed, but merely represents the selected embodiments of the present application.

[0039] Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of this application.

[0040] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are 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 limiting the present application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0041] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0042] Refer to the following Figures 1 to 8 The invention describes a cover plate filling hole sealing assembly, a battery cover plate and a battery according to some embodiments of the present application.

[0043] Embodiment 1

[0044] See also Figures 1 to 8 As shown, an embodiment of the present application provides a cover plate injection hole sealing assembly, which is applied to a battery cover plate 1, and the battery cover plate 1 is formed with mounting grooves 13 arranged sequentially from top to bottom along its height direction and injection through holes 14 connected to the mounting grooves 13, and the cover plate injection hole sealing assembly includes: a first fastening member 2, a second fastening member 3 and a sealing rubber plug 4;

[0045] Among them, the first fastening member 2 is installed in the installation groove 13, and the second fastening member 3 and the first fastening member 2 are detachably connected; the first fastening member 2 is formed with a mounting through hole 23 running through both ends thereof along its height direction, the sealing plug 4 is connected to the first fastening member 2, and the sealing plug 4 extends through the mounting through hole 23 to and is inserted into the liquid injection through hole 14 for sealing the liquid injection through hole 14.

[0046] According to the structure described above, the second fastening member 3 and the first fastening member 2 are detachably connected, so the second fastening member 3 can be removed from the first fastening member 2 to remove the sealing plug 4 from the liquid injection hole 14, and then liquid can be injected into the battery housing 6 to complete the liquid replenishment operation, which can always ensure the performance of the battery, and when the components are damaged, they can be replaced at any time, especially when defective products appear, they can be repaired at any time, thereby avoiding waste of resources.

[0047] In this embodiment, preferably, Figure 2 , Figure 4 and Figure 8 As shown, the second fastening member 3 is connected to the first fastening member 2 by threads, which is a commonly used detachable connection method, which is convenient for installation and disassembly, especially for later maintenance.

[0048] In this embodiment, preferably, Figures 6 to 8 As shown, the sealing rubber plug 4 includes a sealing portion 41 and a limiting portion 42; wherein the limiting portion 42 is arranged at the side of the sealing portion 41; a forming hole 321 and a limiting hole 322 communicating with the forming hole 321 are formed inside the second fastening member 3, and the limiting hole 322 is arranged at the side of the forming hole 321, and the forming hole 321 passes through the bottom surface of the second fastening member 3;

[0049] The sealing portion 41 is disposed in the forming hole 321 , and the lower end of the sealing portion 41 is inserted into the injection through hole 14 via the forming hole 321 and the mounting through hole 23 in sequence; the limiting portion 42 is disposed in the limiting hole 322 .

[0050] According to the structure described above, the limiting portion 42 is disposed in the limiting hole 322 , thereby limiting the sealing plug 4 , so that the connection between the sealing plug 4 and the second fastening member 3 is more firmly and stably achieved.

[0051] Further, preferably, the sealing plug 4 is formed on the second fastening member 3 by injection molding, so that the overall structure becomes stronger and more stable. Of course, it is not limited to this.

[0052] Further, preferably, the number of the limiting holes 322 is multiple and they are sequentially spaced along the outer circumference of the forming hole 321. Correspondingly, the number of the limiting portions 42 is also multiple and they are sequentially spaced along the outer circumference of the sealing portion 41. The multiple limiting holes 322 and the multiple limiting portions 42 correspond one to one. Of course, this is not limited to this. The number of limiting portions 42 and the limiting holes 322 can also be one, which is designed according to actual needs.

[0053] Further, preferably, the limiting portion 42 is cylindrical, and the diameter of the cylindrical structure is 1-2 mm, and its height is equal to the depth of the limiting hole 322, and is about 1-5 mm. Of course, the shape of the limiting portion 42 is not limited to the above, and can also be a quadrangular prism, a triangular prism, etc., which is specifically designed according to actual needs.

[0054] In this embodiment, preferably, Figure 7 and Figure 8 As shown, the bottom end of the sealing rubber plug 4 is provided with a draft angle, and is gradually tapered from top to bottom.

[0055] According to the structure described above, it can be known that the lower end of the sealing rubber plug 4 is provided with a draft angle, which plays a guiding role in the assembly process with the injection hole, making it easier to assemble.

[0056] Further, preferably, the draft angle of the bottom end of the sealing rubber plug 4 is 60°. Of course, it is not limited thereto, and can be greater than 60° or less than 60°, depending on actual needs.

[0057] In this embodiment, preferably, Figure 7 As shown, a missing groove 411 is provided at the bottom end of the sealing rubber plug 4 to reduce the strength of the bottom end of the sealing rubber plug 4, so that it is easy to compress during force assembly, thereby facilitating assembly.

[0058] Further, preferably, the missing groove 411 penetrates the bottom wall surface and the side wall surface of the sealing plug 4 .

[0059] In this embodiment, preferably, Figure 4 and Figure 5 As shown, a hexagonal countersunk hole 33 is provided on the top of the second fastening member 3, and the hexagonal countersunk hole 33 cooperates with a tool to facilitate screwing the second fastening member 3, thereby facilitating installation or removal of the second fastening member 3 and improving the convenience of operation.

[0060] Further, preferably, Figure 4 and Figure 5 As shown, a limiting groove 34 is provided on the top of the second fastening member 3 , and the limiting groove 34 is provided on the side of the hexagonal countersunk hole 33 and is communicated with the hexagonal countersunk hole 33 .

[0061] According to the structure described above, the limiting groove 34 cooperates with the limiting portion of the tool, thereby enhancing the stability and firmness of the cooperation between the tool and the second fastening member 3, making it easier to install and remove the second fastening member 3.

[0062] Furthermore, preferably, each side portion of the hexagonal countersunk hole 33 is provided with a limiting groove 34, thereby improving versatility.

[0063] In this embodiment, preferably, Figure 2 and Figure 3 As shown, the first fastening member 2 includes a connecting plate 21 and a first mounting protrusion 22; wherein the first mounting protrusion 22 is arranged on the upper surface of the connecting plate 21; the mounting through holes 23 are sequentially formed on the first mounting protrusion 22 and the connecting plate 21; and the connecting plate 21 is installed in the mounting groove 13.

[0064] According to the structure described above, the connection plate 21 cooperates with the installation groove 13 to increase the contact area, thereby increasing the stability and firmness of the connection between the two; the first installation protrusion 22 is mainly used to support the second fastening member 3.

[0065] In this embodiment, preferably, Figure 4 and Figure 8 As shown, the second fastening member 3 includes a cover plate 31 and a second mounting protrusion 32; wherein the second mounting protrusion 32 is arranged on the lower surface of the cover plate 31; the sealing plug 4 is connected to the second mounting protrusion 32; the second mounting protrusion 32 is arranged in the mounting through hole 23 and the two are threadedly connected; the cover plate 31 is against the top of the first mounting protrusion 22, and a sealing ring 5 is compressed between the cover plate 31 and the first mounting protrusion 22.

[0066] According to the structure described above, the second mounting protrusion 32 can be screwed into the mounting through hole 23 of the first mounting protrusion 22, thereby realizing a threaded connection, and the assembly is more stable and firm. In addition, the first mounting protrusion 22 is arranged around the periphery of the second mounting protrusion 32, and also plays a role of sealing protection. In addition, a sealing ring 5 is compressed between the cover plate 31 and the first mounting protrusion 22, which plays a further sealing role.

[0067] Further, preferably, an annular groove 24 is provided on the top of the first mounting protrusion 22, and the sealing ring 5 is installed in this annular groove 24. Of course, it is not limited to this. An annular groove can also be provided on the lower surface of the cover plate 31, and the annular groove is arranged around the second mounting protrusion 32, and the sealing ring 5 is installed in this annular groove. The specific design is based on actual needs.

[0068] Furthermore, preferably, the first fastening member 2 is an integrated structure with high overall strength and is not easily damaged.

[0069] Furthermore, preferably, the second fastening member 3 is an integrated structure with high overall strength and is not easily damaged.

[0070] Further, preferably, the forming hole 321 and the limiting hole 322 are formed in the second mounting protrusion 32 ; the hexagonal countersunk hole 33 is formed in the cover plate 31 and the second mounting protrusion 32 in sequence, and the limiting groove 34 is formed in the cover plate 31 .

[0071] Further, preferably, the connecting plate 21 is a circular plate, and correspondingly, the mounting groove 13 is also a circular groove, and the diameter of the connecting plate 21 is smaller than the diameter of the mounting groove 13, and the difference between the two is preferably 0.2 mm; the upper surface of the connecting plate 21 is flush with the notch of the mounting groove 13, or a height difference is formed between the two, and the height difference is preferably <0.1 mm. Of course, it is not limited to the above, and can also be designed according to actual needs.

[0072] It should be noted that the structures of the first fastening member 2 and the second fastening member 3 are not limited to the above. The first fastening member 2 may only include the first mounting protrusion 22, and the second fastening member 3 may only include the second mounting protrusion 32, etc., which are specifically designed according to actual needs.

[0073] In this embodiment, preferably, Figure 3 As shown, the first fastening member 2 is connected to the battery cover 1 by welding, so that the first fastener and the battery cover 1 are connected more stably and firmly, and the operation is simple and convenient. Of course, it is not limited to this. The first fastener can also be connected to the battery cover 1 by bolts, screws, adhesive or interference fit, etc., which is designed according to actual needs.

[0074] In this embodiment, preferably, Figure 8 As shown, the bottom end of the sealing plug 4 extends through the injection hole 14 to the bottom of the injection hole 14, and the height difference Δh1 between the bottom surface of the sealing plug 4 and the lower surface of the battery cover 1 is 1-2mm, avoiding the problem of battery core deformation caused by the excessive length of the sealing plug 4.

[0075] In this embodiment, preferably, Figure 8 As shown, a gap is formed between the lower end surface of the second fastening member 3 and the bottom wall surface of the installation groove 13 to prevent the main body of the cover plate aluminum sheet 11 from being damaged during the assembly process.

[0076] Further, preferably, the lower end surface of the second fastening member 3 is higher than the bottom wall surface of the installation groove 13, and the height difference Δh2 between the lower end surface of the second fastening member 3 and the bottom wall surface of the installation groove 13 is 2 mm to 5 mm.

[0077] In this embodiment, preferably, Figure 8 As shown, a protective protrusion 15 with a hollow interior and an open top is formed on the bottom of the battery cover 1, that is, on the lower plastic 12, and a plurality of through holes arranged in sequence along its circumference are also opened on the side of the protective protrusion 15. The through holes are connected to the hollow interior of the protective protrusion 15. The bottom end of the aforementioned sealing plug 4 extends into the protective protrusion 15. The protective protrusion 15 is mainly used to prevent the electrolyte from directly rushing onto the electrode, thereby alleviating the impact force.

[0078] Embodiment 2

[0079] See also Figure 1 As shown, the second embodiment of the present application also provides a battery cover 1, including the cover injection hole sealing assembly described in the above-mentioned embodiment 1, and thus has all the beneficial technical effects of the cover injection hole sealing assembly, and the same technical features and beneficial effects are no longer repeated.

[0080] In this embodiment, preferably, Figure 1 and Figure 8 As shown, the battery cover 1 also includes a plain aluminum sheet 11 and a lower plastic 12; wherein the lower plastic 12 is arranged on the lower surface of the plain aluminum sheet 11; the plain aluminum sheet 11 is formed with mounting grooves 13 arranged in sequence from top to bottom along its height direction and a liquid injection through hole 14 connected to the mounting groove 13, and the liquid injection through hole 14 extends and passes through the lower plastic 12; the second fastening member 3 is installed in the mounting groove 13; the sealing plug 4 is inserted into the liquid injection through hole 14 for sealing the liquid injection through hole 14.

[0081] According to the structure described above, the battery cover 1 provided in the present application is equipped with a new type of liquid injection hole sealing structure, and this structure is detachable, so when it is damaged, it can be replaced at any time, which ensures the yield rate, and the electrolyte can be replenished inside the battery at any time to ensure the battery's performance and life.

[0082] It should be noted that the battery cover 1 also includes structures such as poles and explosion-proof valves, which are all existing technologies and will not be described in detail here.

[0083] Embodiment 3

[0084] See also Figure 1 As shown, the third embodiment of the present application also provides a battery, including the battery cover 1 described in the second embodiment, and thus has all the beneficial technical effects of the battery cover 1, and the same technical features and beneficial effects are not repeated.

[0085] In this embodiment, preferably, Figure 1 As shown, the battery further comprises a shell 6, at least one end of the shell 6 along the height direction thereof is formed with an opening, and a battery cover plate 1 is installed in any opening.

[0086] According to the structure described above, the battery cover 1 of the battery provided in the present application is equipped with a new type of liquid injection hole sealing structure, and this structure is detachable, so when it is damaged, it can be replaced at any time, which ensures the yield rate, and the electrolyte can be replenished inside the battery at any time to ensure the battery's performance and life.

[0087] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A cover plate injection hole sealing assembly, applied to a battery cover plate, wherein the battery cover plate is formed with mounting grooves arranged in sequence from top to bottom along its height direction and injection holes connected to the mounting grooves, characterized in that: The cover plate liquid injection hole sealing assembly comprises: a first fastening member, a second fastening member and a sealing rubber plug; Among them, the first fastening member is installed in the installation groove, and the second fastening member and the first fastening member are detachably connected; the first fastening member is formed with installation through holes running through both ends thereof along its height direction, the sealing rubber plug is connected to the first fastening member, and the sealing rubber plug extends through the installation through holes to and is inserted into the liquid injection through hole for sealing the liquid injection through hole.

2. The cover plate liquid injection hole sealing assembly according to claim 1, characterized in that: The second fastening member is threadably connected to the first fastening member.

3. The cover plate liquid injection hole sealing assembly according to claim 1, characterized in that: The sealing rubber plug comprises a sealing portion and a limiting portion; wherein the limiting portion is arranged on the side of the sealing portion; a forming hole and a limiting hole communicating with the forming hole are formed inside the second fastening member, and the limiting hole is arranged on the side of the forming hole; The sealing part is arranged in the forming hole, and the lower end of the sealing part is inserted into the injection through hole through the forming hole and the installation through hole in sequence; the limiting part is arranged in the limiting hole.

4. The cover plate liquid injection hole sealing assembly according to claim 1, characterized in that: The sealing rubber plug is formed on the first fastening member by injection molding; and / or The bottom end of the sealing rubber plug is provided with a draft angle, and is tapered from top to bottom; and / or The bottom end of the sealing rubber plug is provided with a missing groove.

5. The cover plate liquid injection hole sealing assembly according to claim 1, characterized in that: A hexagonal countersunk hole is arranged on the top of the second fastening member.

6. The cover plate liquid injection hole sealing assembly according to claim 5, characterized in that: A limiting groove is arranged on the top of the second fastening member, and the limiting groove is arranged on the side of the hexagonal countersunk hole and is communicated with the hexagonal countersunk hole.

7. The cover plate liquid injection hole sealing assembly according to claim 2, characterized in that: At least a portion of the second fastening member is disposed in the mounting through hole, and the two are connected via threads.

8. The cover plate liquid injection hole sealing assembly according to claim 7, characterized in that: The first fastening member includes a connecting plate and a first mounting protrusion; wherein the first mounting protrusion is arranged on the upper surface of the connecting plate; the mounting through holes are sequentially formed on the first mounting protrusion and the connecting plate; and the connecting plate is installed in the mounting groove.

9. The cover plate liquid injection hole sealing assembly according to claim 8, characterized in that: The second fastening member includes a cover plate and a second mounting protrusion; wherein the second mounting protrusion is arranged on the lower surface of the cover plate; and the sealing rubber plug is connected to the second mounting protrusion; The second mounting protrusion is arranged in the mounting through hole and the two are threadedly connected; the cover plate is against the top of the first mounting protrusion, and a sealing ring is compressed between the cover plate and the first mounting protrusion.

10. The cover plate liquid injection hole sealing assembly according to any one of claims 1 to 9, characterized in that: The first fastening member is connected to the battery cover plate by welding or a fastening member; and / or The bottom end of the sealing rubber plug extends through the liquid injection through hole to below the liquid injection through hole, and the height difference between the bottom surface of the sealing rubber plug and the lower surface of the battery cover plate is 1-2 mm; and / or The lower end surface of the second fastening member is higher than the bottom wall surface of the installation groove.

11. A battery cover, characterized in that: It comprises a plain aluminum sheet, a lower plastic, and a cover plate liquid injection hole sealing assembly as claimed in any one of claims 1 to 10; Among them, the lower plastic is arranged on the lower surface of the smooth aluminum sheet; the smooth aluminum sheet is formed with a mounting groove arranged in sequence from top to bottom along its height direction and a liquid injection through hole connected to the mounting groove, and the liquid injection through hole extends and passes through the lower plastic; the second fastening member is installed in the mounting groove; the sealing rubber plug is inserted into the liquid injection through hole to seal the liquid injection through hole.

12. A battery, characterized in that: It comprises a shell and the battery cover plate as claimed in claim 11, wherein at least one end of the shell along the height direction thereof is formed with an opening, and the battery cover plate is installed in any of the openings.

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