Cover plate sealing assembly, battery, battery device and electric equipment

Abstract

The utility model relates to the technical field of batteries, in particular to a cover plate sealing assembly, a battery, a battery device and electric equipment. The cover plate sealing assembly comprises a cover plate provided with a liquid injection hole; the sealing nail is arranged in the liquid injection hole, the sealing nail is provided with a sealing surface, and the sealing surface is used for sealing the liquid injection hole; the sealing cover covers the sealing nail; the distance between the cut-off end of the sealing face and the liquid injection hole is W1, the distance between the sealing nail and the two opposite side faces of the sealing cover is W2, and W1 is larger than or equal to W2. The cut-off end exceeds the distance of the liquid outlet of the liquid injection hole and is greater than or equal to the distance between the sealing nail and the sealing cover, so that one side of the sealing surface can still exceed or be flush with the liquid injection hole under the conditions of internal pressure of a battery cell, external vibration and the like even if the sealing nail moves to be clung to the sealing cover, enough compression amount of the sealing surface is ensured, and the service life of the battery is prolonged. Therefore, the problem of sealing failure is avoided, the liquid leakage phenomenon is avoided, and the yield and the safety of the battery are improved.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and particularly to a cover plate sealing assembly, a battery, a battery device and an electrical equipment. Background Art

[0002] Currently, when a battery is assembled and manufactured, a battery cell is usually placed in a housing, and then the battery cell is sealed in the housing by assembling a cover plate; electrolyte is added through a liquid injection hole on the cover plate, and then the liquid injection hole is sealed to complete the liquid injection process of the battery.

[0003] However, in the prior art, under the action of the internal pressure of the battery cell and the external vibration condition, the sealing nail for sealing the liquid injection hole is likely to move and cause sealing failure, resulting in liquid leakage from the liquid injection hole, and causing battery defects and safety problems. Utility Model Content

[0004] Based on this, the present application provides a cover plate sealing assembly, a battery, a battery device and an electrical equipment to solve the problems of sealing failure of the sealing nail, resulting in liquid leakage from the liquid injection hole, and the battery having defects and safety problems.

[0005] On the one hand, the present application provides a cover plate sealing assembly, including:

[0006] A cover plate, the cover plate is provided with a liquid injection hole;

[0007] A sealing nail, the sealing nail is arranged in the liquid injection hole, the sealing nail has a sealing surface, and the sealing surface is used to seal the liquid injection hole;

[0008] A sealing cover, the sealing cover covers the sealing nail;

[0009] Wherein, along the axial direction of the liquid injection hole, the distance from the cut-off end of the sealing surface to the liquid outlet of the liquid injection hole is W1, and the distance between the two opposite side surfaces of the sealing nail and the sealing cover is W2;

[0010] W1 and W2 satisfy: W1≥W2.

[0011] In a possible implementation manner, the cover plate is provided with a second sink groove surrounding the liquid injection hole, the sealing nail includes a sealing nail edge and a sealing nail column, the sealing nail edge is arranged in the second sink groove, the sealing nail edge is connected to one end of the sealing nail column close to the sealing cover, and the other end of the sealing nail column penetrates through the liquid injection hole, and the sealing surface is configured as the outer peripheral surface of the sealing nail column.

[0012] In a possible implementation manner, the cover plate is provided with a first sink groove surrounding the second sink groove, the sealing cover is arranged in the first sink groove to close the liquid injection hole and the sealing nail, and along the axial direction of the liquid injection hole, the first sink groove, the second sink groove and the liquid injection hole are arranged in sequence.

[0013] In a possible implementation, a groove is provided on one side of the sealing cover facing the sealing nail, and the orthographic projection of the sealing nail on the projection plane is located within the orthographic projection of the groove on the projection plane. The projection plane is perpendicular to the axial direction of the liquid injection hole, and the distance between the two opposite side surfaces of the sealing nail and the sealing cover is the distance between the side surface along the sealing nail and the bottom of the groove.

[0014] In a possible implementation, along the axial direction of the liquid injection hole, the total thickness of the sealing cover is a, the depth of the groove is b, the thickness along the sealing nail is c, the distance from the cut-off end to the part along the sealing nail is d, the depth of the first sinking groove is L1, the depth of the second sinking groove is L2, the depth of the liquid injection hole is L3, and X is the root mean square of the dimensional tolerance values of a, b, c, d, L1, L2, and L3;

[0015] W1, a, b, c, d, L1, L2, L3, and X satisfy:

[0016] W1 = (a - b + c + d - L1 - L2 - L3 - X) ≥ 0.

[0017] In a possible implementation, along the axial direction of the liquid injection hole, the total length of the sealing nail is L4; W1 and L4 satisfy:

[0018] W1 ≥ 15%L4.

[0019] In a possible implementation, along the direction away from the part along the sealing nail, the cross-sectional area of the sealing nail column gradually decreases.

[0020] In a possible implementation, the diameter of the part along the sealing nail is R1, and the aperture diameter of the liquid injection hole is R2; R1 and R2 satisfy: R1 ≥ 130%R2.

[0021] In a possible implementation, the aperture diameter of the liquid injection hole is R2, and the diameter of the cut-off end is R3; R2 and R3 satisfy: R3 ≥ 104%R2.

[0022] In a possible implementation, the sealing nail further includes a nail body, the nail body is connected to one end of the part along the sealing nail close to the sealing nail column, and the sealing nail column is sleeved on the outer periphery of the nail body.

[0023] In a possible implementation, a buckle is provided on the nail body, and a clamping groove is provided in the sealing nail column, and the buckle is clamped in the clamping groove.

[0024] In a possible implementation, the part along the sealing nail and the nail body are an integrally formed part made of plastic material, and / or the sealing nail column is made of rubber material.

[0025] In a possible implementation, the part along the sealing nail and the sealing nail column are an integrally formed part made of rubber material.

[0026] On the other hand, the present application provides a battery, including:

[0027] Shell;

[0028] Electric core, and the electric core is arranged in the shell;

[0029] The above-mentioned cover plate sealing assembly, and the cover plate sealing assembly covers the opening of the shell to seal the electric core.

[0030] On the other hand, the present application provides a battery device, including at least one of the above-mentioned batteries.

[0031] On yet another aspect, the present application provides an electrical equipment, including the above-mentioned battery device or the above-mentioned battery.

[0032] For the cover plate sealing assembly, battery, battery device and electrical equipment provided by the present application, by setting that the distance W1 from the cut-off end of the sealing surface to the liquid outlet of the liquid injection hole is greater than or equal to the distance W2 between the two opposite side surfaces of the sealing nail and the sealing cover, that is, the distance from the side of the sealing surface away from the sealing cover exceeding the opening of the side of the liquid injection hole away from the sealing cover is greater than or equal to the distance between the two opposite side surfaces of the sealing nail and the sealing cover, so that under the condition of the internal pressure of the electric core and external vibration of the battery, even when the sealing nail moves to be in close contact with the sealing cover, the side of the sealing surface away from the sealing cover can still exceed or be flush with the liquid injection hole, ensuring that there is enough compression amount on the sealing surface, thus preventing the problem of sealing failure, and further avoiding the phenomenon of liquid leakage, improving the yield and safety of the battery. Description of the Drawings

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0034] Figure 1 It is a schematic structural diagram of the cover plate sealing assembly provided by the embodiment of the present application;

[0035] Figure 2 For Figure 1 The sectional view of the cover plate sealing assembly shown along A-A;

[0036] Figure 3 For Figure 1 The schematic structural diagram of the cover plate of the cover plate sealing assembly shown;

[0037] Figure 4 For Figure 3 The sectional view of the cover plate shown along B-B;

[0038] Figure 5 For Figure 4Schematic diagram of the enlarged structure of part C of the cover plate shown;

[0039] Figure 6 For Figure 1 Schematic diagram of the structure of the sealing nail of the cover plate sealing assembly shown;

[0040] Figure 7 For Figure 6 Schematic diagram of the structure of the sealing nail from another angle shown;

[0041] Figure 8 For Figure 6 Cross-sectional view of the sealing nail shown;

[0042] Figure 9 For Figure 1 Cross-sectional view of another sealing nail of the cover plate sealing assembly shown;

[0043] Figure 10 For Figure 1 Cross-sectional view of the partially disassembled structure of the cover plate sealing assembly shown;

[0044] Figure 11 For Figure 10 Schematic diagram of the enlarged structure of part D of the cover plate sealing assembly shown;

[0045] Figure 12 One of the cross-sectional views of the partial structure of the cover plate sealing assembly provided by the embodiment of the present application;

[0046] Figure 13 Two of the cross-sectional views of the partial structure of the cover plate sealing assembly provided by the embodiment of the present application;

[0047] Figure 14 Three of the cross-sectional views of the partial structure of the cover plate sealing assembly provided by the embodiment of the present application;

[0048] Figure 15 Partial structure schematic diagram of the cover plate sealing assembly provided by the embodiment of the present application;

[0049] Figure 16 Schematic diagram of the structure of the battery provided by the embodiment of the present application;

[0050] Figure 17 For Figure 16 Cross-sectional view of the battery shown;

[0051] Figure 18 For Figure 17 Schematic diagram of the enlarged structure of part E of the battery shown.

[0052] Explanation of reference numerals:

[0053] 100 - Cover sealing assembly; 10 - Cover plate; 11 - Liquid injection hole; 111 - First sink; 112 - Second sink; 113 - Third hole; 20 - Sealing nail; 21 - Sealing nail edge; 22 - Sealing nail post; 221 - Sealing part; 222 - Guide part; 23 - Nail body; 233 - Snap; 241 - Connecting groove; 242 - Card slot; 201 - Sealing surface; 30 - Sealing cover; 31 - Groove; 300 - Battery; 301 - Housing; 302 - Battery cell. Detailed implementation manners

[0054] To make the objectives, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be described in more detail below with reference to the accompanying drawings in the preferred embodiments of the present application. In the drawings, the same or similar reference numerals represent the same or similar components or components with the same or similar functions from beginning to end. The described embodiments are some, but not all, of the embodiments of the present application. The embodiments described below by referring to the drawings are exemplary and are intended to explain the present application, and should not be construed as a limitation on the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of the present application. The embodiments of the present application will be described in detail below with reference to the drawings.

[0055] In the description of the present application, it should be noted that, unless otherwise clearly defined and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, or an indirect connection through an intermediate medium, or the communication inside two components or the interaction relationship between two components. 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.

[0056] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is the orientation or positional relationship based on the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the present application.

[0057] The terms "first", "second", "third" (if any) in the description and claims of the present application and the above drawings are used to distinguish similar objects, and do not necessarily describe a specific order or sequence.

[0058] In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or display that comprises a series of steps or units need not be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products, or displays.

[0059] Currently, when a battery is assembled and manufactured, the battery cell is usually placed in a housing, and then the battery cell is sealed in the housing by assembling a cover plate; electrolyte is added through a liquid injection hole on the cover plate, and then the liquid injection hole is sealed to complete the liquid injection process of the battery.

[0060] However, in the prior art, under the action of the internal pressure of the battery cell and external vibration conditions, the sealing nail for sealing the liquid injection hole is prone to move, resulting in sealing failure, causing liquid leakage from the liquid injection hole, and leading to battery defects and safety problems.

[0061] After repeated thinking and verification, the inventor found that if the length of the sealing nail is designed such that even during vibration, the sealing surface of the sealing nail is below the position of the liquid injection hole and beyond the downstream of the liquid injection hole, the effective compression amount in the liquid injection hole can be ensured. Not only is the effective sealing surface longer, but it also ensures that the liquid injection hole is sealed without liquid leakage, improving the yield and safety of the battery.

[0062] In view of this, the present application provides a cover plate sealing assembly, including: a cover plate provided with a liquid injection hole; a sealing nail disposed in the liquid injection hole, the sealing nail having a sealing surface for sealing the liquid injection hole; a sealing cover covering the sealing nail; wherein, along the axial direction of the liquid injection hole, the distance from the cut-off end of the sealing surface to the liquid outlet of the liquid injection hole is W1, and the distance between the two opposite side surfaces of the sealing nail and the sealing cover is W2; W1 and W2 satisfy: W1 ≥ W2.

[0063] By covering the sealing nail with a sealing cover, and the distance from the side of the sealing surface away from the sealing cover to the opening of the liquid injection hole away from the sealing cover is greater than or equal to the distance between the two opposite side surfaces of the sealing nail and the sealing cover, so that under the action of the internal pressure of the battery cell and external vibration and other conditions, even when the sealing nail moves to be in contact with the sealing cover, the side of the sealing surface away from the sealing cover 30 can still exceed or be flush with the liquid injection hole, ensuring that there is sufficient compression amount on the sealing surface, thus preventing the problem of sealing failure and further eliminating the phenomenon of liquid leakage, improving the yield and safety of the battery.

[0064] The content of the present application will be described in detail below with reference to the accompanying drawings, so that those skilled in the art can understand the content of the present application more clearly and in detail.

[0065] Figure 1 It is a schematic structural diagram of the cover plate sealing assembly provided by the embodiment of the present application.Figure 2 The Figure 1 sectional view of the cover plate sealing assembly shown along A-A. Figure 3 The Figure 1 structural schematic diagram of the cover plate of the cover plate sealing assembly shown. Figure 4 The Figure 3 sectional view of the cover plate shown along B-B. Figure 5 The Figure 4 enlarged structural schematic diagram of part C of the cover plate shown. Figure 6 The Figure 1 structural schematic diagram of the sealing nail of the cover plate sealing assembly shown. Figure 7 The Figure 6 structural schematic diagram of the sealing nail from another angle shown. Figure 8 The Figure 6 sectional view of the sealing nail shown. Figure 9 The Figure 1 sectional view of another kind of sealing nail of the cover plate sealing assembly shown. Figure 10 The Figure 1 sectional view of the partially disassembled structure of the cover plate sealing assembly shown. Figure 11 The Figure 10 enlarged structural schematic diagram of part D of the cover plate sealing assembly shown. Figure 12 One of the sectional views of the partial structure of the cover plate sealing assembly provided by the embodiment of the present application. Figure 13 Another sectional view of the partial structure of the cover plate sealing assembly provided by the embodiment of the present application. Figure 14 Another sectional view of the partial structure of the cover plate sealing assembly provided by the embodiment of the present application. Figure 15 Partial structural schematic diagram of the cover plate sealing assembly provided by the embodiment of the present application. Figure 16 Structural schematic diagram of the battery provided by the embodiment of the present application. Figure 17 The Figure 16 sectional view of the battery shown. Figure 18 The Figure 17 enlarged structural schematic diagram of part E of the battery shown.

[0066] As Figure 1 and Figure 2 shown, a cover plate sealing assembly 100 provided by the embodiment of the present application is used in the battery 300. The cover plate sealing assembly 100 includes a cover plate 10, a sealing nail 20 and a sealing cover 30. The sealing nail 20 and the sealing cover 30 are respectively arranged on the cover plate 10.

[0067] As Figure 3 and Figure 4 shown, the cover plate 10 is provided with a liquid injection hole 11. The liquid injection hole 11 penetrates through the upper and lower surfaces of the cover plate 10, and the liquid injection hole 11 is used for injecting electrolyte into the battery 300.

[0068] As Figure 10 andFigure 11 As shown, a sealing nail 20 is disposed in the liquid injection hole 11. Optionally, the sealing nail 20 is in interference fit with the liquid injection hole 11. The sealing nail 20 is used to seal the liquid injection hole 11 to prevent the outflow of the electrolyte.

[0069] A sealing surface 201 is provided on the sealing nail 20. The sealing surface 201 is the assembly surface of the sealing nail 20. The sealing surface 201 abuts against the liquid injection hole 11 to seal the liquid injection hole 11.

[0070] A sealing cover 30 covers the sealing nail 20. The sealing cover 30 is used to provide sealing protection for the sealing nail 20 to prevent damage to the sealing nail 20 by external objects. Optionally, the sealing cover 30 is welded to the cover plate 10 to prevent liquid leakage, thereby improving the sealing effect of the liquid injection hole 11.

[0071] Optionally, the sealing cover 30 is disposed in the liquid injection hole 11.

[0072] As Figure 12 shown, wherein, the cut-off end of the sealing surface 201 is P, that is, the end on the side of the sealing surface 201 away from the sealing cover 30, and the liquid outlet of the liquid injection hole 11 is Q, that is, the opening position on the side of the liquid injection hole 11 away from the sealing cover 30. Along the axial direction of the liquid injection hole 11, the distance that the position P exceeds the position Q is W1. The distance between the two opposite side surfaces of the sealing nail 20 and the sealing cover 30 is W2.

[0073] W1 and W2 satisfy: W1 ≥ W2.

[0074] By setting the length of the sealing surface 201, when the sealing nail 20 moves, the sealing surface 201 can be ensured to be located on the side of the liquid injection hole 11 away from the sealing cover 30, that is, to ensure that the sealing surface 201 abuts against the liquid injection hole 11 and ensure the sealing of the liquid injection hole 11.

[0075] As Figure 5 shown, in a possible implementation manner, the liquid injection hole 11 is a part of a stepped hole provided on the cover plate 10. The stepped hole on the cover plate 10 includes a first sink 111, a second sink 112, and a third hole 113. The first sink 111, the second sink 112, and the third hole 113 are communicated in sequence. Along the axial direction of the liquid injection hole 11, the first sink 111, the second sink 112, and the liquid injection hole 11 are arranged in sequence.

[0076] The setting of the stepped hole can prevent interference between the sealing nail 20 and the sealing cover 30 during the assembly process, resulting in poor assembly problems, and can also position the sealing nail 20 and the sealing cover 30 during the assembly process, thereby improving the assembly efficiency.

[0077] Wherein, the liquid injection hole 11 is the third hole 113. The second sink 112 is arranged around the third hole 113, and the first sink 111 is arranged around the second sink 112.

[0078] Optionally, the second sink 112 is located at the bottom of the first sink 111, and the third hole 113 is located at the bottom of the second sink 112.

[0079] Optionally, the axes of the first sink 111, the second sink 112, and the third hole 113 coincide.

[0080] As Figure 12 shown, optionally, the sealing cover 30 is disposed in the first sink 111 to seal the liquid injection hole 11 and the sealing nail 20. The sealing nail 20 is disposed in the second sink 112 and the third hole 113. The sealing surface 201 is used to seal the hole wall of the third hole 113.

[0081] Optionally, the sealing cover 30 is connected to the bottom of the first sink 111, so that the sealing cover 30 is disposed in the first sink 111.

[0082] Optionally, the sealing cover 30 is connected to the bottom of the first sink 111 by welding.

[0083] Optionally, the thickness of the sealing cover 30 is equal to the hole depth of the first sink 111, so that the sealing cover 30 is flush with the surface of the cover plate 10, improving the flatness of the appearance.

[0084] Optionally, the sealing nail 20 is inserted into the third hole 113 against the bottom of the second sink 112, and the sealing surface 201 is in abutting contact with the hole wall of the third hole 113 to play a sealing role.

[0085] Optionally, a fillet is provided at the connection between the second sink 112 and the third hole 113, so as to prevent possible damage when the sealing nail 20 is inserted.

[0086] As Figure 6 and Figure 7 shown, in a possible implementation, the sealing nail 20 includes a sealing nail edge 21 and a sealing nail post 22. The sealing nail post 22 is connected to the sealing nail edge 21. The sealing surface 201 is configured as the outer peripheral surface of the sealing nail post 22.

[0087] Specifically, the sealing nail edge 21 is connected to one end of the sealing nail post 22 close to the sealing cover 30. The other end of the sealing nail post 22 passes through the liquid injection hole 11.

[0088] In a possible implementation, the sealing nail 20 is an integral structure.

[0089] Optionally, the material of the sealing nail 20 is pure rubber materials such as EPDM (Ethylene Propylene Diene Monomer) and KFM (fluororubber). The sealing nail 20 is integrally manufactured from rubber material, that is, the sealing nail edge 21 and the sealing nail post 22 are integrally formed parts made of rubber material.

[0090] The diameter of the sealing flange 21 is larger than the diameter of the sealing stud 22, so that the sealing flange 21 is arranged in the second sinking groove 112, and the sealing stud 22 is arranged in the third hole 113.

[0091] The diameter of the sealing flange 21 being larger than that of the sealing stud 22 can prevent the whole sealing nail 20 from passing through the liquid injection hole 11 and falling into the battery housing 301 due to assembly problems such as excessive pressure applied by the pressing rod when the sealing nail 20 is inserted into the liquid injection hole 11.

[0092] In a possible implementation, the sealing stud 22 includes a sealing part 221 and a guiding part 222 that are connected to each other. The sealing part 221 is located on the side of the sealing stud 22 close to the sealing flange 21 and is connected to the sealing flange 21. The guiding part 222 is located on the side of the sealing stud 22 far from the sealing flange 21. The sealing surface 201 is the outer peripheral surface of the sealing part 221.

[0093] The sealing surface 201 is located downstream on the side of the third hole 113 far from the second sinking groove 112.

[0094] The guiding part 222 is used to guide the insertion position of the sealing nail 20, so as to facilitate the insertion of the sealing nail 20 into the liquid injection hole 11.

[0095] Such as Figure 8 As shown, in a possible implementation, along the direction away from the sealing flange 21, the cross-sectional area of the sealing stud 22 gradually decreases.

[0096] That is, the radius of the sealing stud 22 is the largest on the side close to the sealing flange 21 and the smallest on the side far from the sealing flange 21. This facilitates the insertion of the sealing stud 22 into the liquid injection hole 11, thereby improving the assembly efficiency.

[0097] In a possible implementation, along the direction away from the sealing flange 21, the radius of the sealing part 221 gradually decreases, that is, the cross-section of the sealing part 221 is an inclined plane.

[0098] The sealing surface 201 on the sealing part 221 is thus an inclined plane with a certain angle. When the sealing nail 20 is inserted into the liquid injection hole 11, it can facilitate the assembly of the sealing surface 201 into the third hole 113 and cooperate with the hole wall of the third hole 113 for sealing.

[0099] Optionally, the side surface of the guiding part 222 is connected to the sealing surface 201 provided on the sealing part 221.

[0100] Optionally, along the direction away from the sealing flange 21, the radius of the guiding part 222 gradually decreases.

[0101] Optionally, the minimum diameter of the guiding portion 222 is smaller than the aperture diameter of the third hole 113, so that when the sealing nail 20 is inserted into the liquid injection hole 11, it is convenient to quickly position and insert the sealing nail 20 into the third hole 113 through the guiding portion 222.

[0102] As Figure 14 shown, in a possible implementation, the diameter of the sealing nail along 21 is R1, and the aperture diameter of the third hole 113 is R2.

[0103] R1 and R2 satisfy: R1 ≥ 130%R2.

[0104] By designing the diameter of the sealing nail along 21, it is possible to prevent the sealing nail 20 from being too small and falling into the liquid injection hole 11 during assembly and use, causing problems such as liquid leakage and damage to the battery core 302 in the battery 300.

[0105] In a possible implementation, the diameter of the cut-off end is R3.

[0106] R2 and R3 satisfy: R3 ≥ 104%R2.

[0107] Since the diameter of the sealing surface 201 is on the side of the sealing portion 221 away from the sealing nail along 21, that is, the cut-off end is the smallest, therefore, when the diameter of the cut-off end is at least 4% larger than the diameter of the third hole 113, it can ensure that there is an effective compression amount on the entire sealing surface 201 and ensure the sealing effect of the sealing surface 201.

[0108] In a possible implementation, the sealing nail 20 is a split structure.

[0109] As Figure 9 and Figure 13 shown, optionally, the sealing nail 20 further includes a nail body 23. The nail body 23 is connected to one end of the sealing nail along 21 close to the sealing nail column 22, and the sealing nail column 22 is sleeved on the outer periphery of the nail body 23.

[0110] In a possible implementation, the nail body 23 and the sealing nail along 21 are integrally formed parts made of plastic materials such as PPS, etc. The sealing nail column 22 is made of rubber materials such as EPDM, KFM, etc.

[0111] The sealing nail edge 21, the nail body 23 and the sealing nail post 22 are processed and formed from two materials respectively. When the sealing nail 20 is assembled and inserted into the liquid injection hole 11, the pressure applied by the pressing rod to the sealing nail 20 is received by the sealing nail edge 21 and the nail body 23. The sealing nail edge 21 and the nail body 23 are made of plastic material, which is harder and the plastic material has no rebound and is not easy to deform. The sealing nail post 22 of the sealing part is made of rubber material. Due to the elastic deformation of the rubber, it can cooperate with the third hole 113 to play a sealing role. Moreover, the nail body 23 located inside the sealing nail post 22 can also improve the overall strength of the sealing nail 20 and enhance the sealing effect of the sealing nail post 22.

[0112] Optionally, a connecting groove 241 is provided on the sealing nail post 22. The nail body 23 is arranged in the connecting groove 241.

[0113] In a possible implementation manner, a buckle 233 is provided on the nail body 23. A clamping groove 242 is provided inside the sealing nail post 22. The buckle 233 is clamped in the clamping groove 242 to connect the nail body 23 and the sealing nail post 22.

[0114] Optionally, the buckle 233 is arranged on the side of the nail body 23 away from the sealing nail edge 21. The clamping groove 242 communicates with the connecting groove 241 and is located at the bottom of the connecting groove 241. Thus, when the nail body 23 is inserted into the connecting groove 241, the buckle 233 is clamped in the clamping groove 242, thereby fixedly connecting the sealing nail post 22 and the nail body 23.

[0115] In a possible implementation manner, a groove 31 is provided on the sealing cover 30. The groove 31 is provided on the side of the sealing cover 30 facing the sealing nail 20.

[0116] The setting of the groove 31 can make there be a certain gap between the sealing nail 20 and the sealing cover 30, ensuring that the sealing nail 20 has a certain assembly adjustment margin. Thus, when assembling components such as the battery cell 302 in the battery housing 301, it can prevent problems such as incomplete assembly caused by a small amount of assembly error.

[0117] Along the axial direction of the liquid injection hole 11, the orthographic projection of the sealing nail 20 on the plane where the sealing cover 30 is located is located within the orthographic projection of the groove 31, that is, the orthographic projection of the sealing nail 20 on the projection plane is located within the orthographic projection of the groove 31 on the projection plane, and the projection plane is perpendicular to the axial direction of the liquid injection hole 11.

[0118] Since the orthographic projection of the sealing nail 20 is located within the orthographic projection of the groove 31, when the sealing nail 20 moves due to vibration or other reasons, the sealing nail 20 moves into the groove 31. Therefore, the distance between the two opposite sides of the sealing nail 20 and the sealing cover 30 is the distance between the side of the sealing nail edge 21 and the bottom of the groove 31.

[0119] Such as Figure 15As shown, in a possible implementation, along the axial direction of the liquid injection hole 11, the total thickness of the sealing cover 30 is a, the depth of the groove 31 is b, the thickness of the sealing nail edge 21 is c, and the distance from the side of the sealing surface 201 away from the sealing nail edge 21 to the connection position between the sealing nail post 22 and the sealing nail edge 21 is d, that is, the distance from the cut-off end to the sealing nail edge 21; the depth of the first sink 111 is L1, the depth of the second sink 112 is L2, and the depth of the third hole 113 is L3, that is, the depth of the liquid injection hole 11.

[0120] X is the root mean square of the dimensional tolerance values of a, b, c, d, L1, L2, and L3 above.

[0121] That is,

[0122] W1, a, b, c, d, L1, L2, L3, and X satisfy:

[0123] W1 = (a - b + c + d - L1 - L2 - L3 - X) ≥ 0.

[0124] To ensure the effective compression of the sealing nail 20, in the extreme case, under the action of the internal pressure of the battery cell and the external vibration condition, the upper surface of the sealing nail 20 moves up to closely adhere to the bottom of the groove 31 of the sealing cover 30. At this time, the effective compression amount of the sealing nail 20 is the smallest. If W1 ≥ 0 at this time, the sealing effect of the sealing nail 20 can be ensured.

[0125] In a possible implementation, along the axial direction of the liquid injection hole 11, the total length of the sealing nail 20 is L4.

[0126] W1 and L4 satisfy: W1 ≥ 15%L4.

[0127] Further considering the influence of the compression and permanent deformation of the sealing nail 20 in the length direction under the action of the internal pressure of the battery cell, temperature, electrolyte, etc. in the length direction of the sealing nail 20, the minimum value of W1 should be at least greater than or equal to 15% of the total length of the sealing nail 20 to ensure the effective compression amount of the sealing nail 20.

[0128] Optionally, when the first sink 111 and the second sink 112 are the same hole, that is, the liquid injection hole 11 is a single-step hole, L1 and L2 can be combined into L. At this time, both the sealing cover 30 and the sealing nail 20 are assembled in the L area, and W1 satisfies: W1 = (a - b + c + d - L - L3 - X) ≥ 15%L4.

[0129] During assembly, the sealing nail 20 is first assembled into the liquid injection hole 11, and then the sealing cover 30 is connected to the bottom of the first sink 111 by welding means, so as to play a dual-sealing role.

[0130] The cover plate sealing assembly 100 provided by the embodiment of the present application includes a cover plate 10, a sealing nail 20 and a sealing cover 30. The cover plate 10 is provided with a liquid injection hole 11. The sealing nail 20 is arranged in the liquid injection hole 11. The sealing nail 20 has a sealing surface 201 for sealing the liquid injection hole 11. The sealing cover 30 covers the sealing nail 20. Wherein, along the axial direction of the liquid injection hole 11, the distance from the cut-off end of the sealing surface 201 to the liquid outlet of the liquid injection hole 11 is greater than or equal to the distance between the two opposite side surfaces of the sealing nail 20 and the sealing cover 30.

[0131] By covering the sealing nail 20 with the sealing cover 30, and the distance from the side of the sealing surface 201 away from the sealing cover 30 to the opening of the side of the liquid injection hole 11 away from the sealing cover 30 is W1, and the distance between the two opposite side surfaces of the sealing nail 20 and the sealing cover 30 is W2, and W1 and W2 satisfy: W1≥W2. Thus, when the battery is under the action of the internal pressure of the battery cell and external vibration and other conditions, even when the sealing nail 20 moves to be in close contact with the sealing cover 30, the side of the sealing surface 201 away from the sealing cover 30 can still exceed or be flush with the liquid injection hole 11, ensuring that there is enough compression amount on the sealing surface 201, so that the problem of sealing failure will not occur, and there will be no liquid leakage phenomenon, improving the yield and safety of the battery.

[0132] In addition, as Figure 16 and Figure 17 shown, the embodiment of the present application also provides a battery 300, including a housing 301, a cover plate sealing assembly 100 and a battery cell 302. The housing 301 is provided with the above-mentioned cover plate sealing assembly 100. The battery cell 302 is arranged in the housing 301. The cover plate sealing assembly 100 covers the opening of the housing 301 to seal the battery cell 302.

[0133] As Figure 18 shown, among them, the specific structure, working principle and function of the cover plate sealing assembly 100 have been described in detail in the foregoing embodiments, and will not be elaborated here.

[0134] In addition, the embodiment of the present application also provides a battery device, including at least one of the above-mentioned batteries.

[0135] A plurality of batteries are connected in series or in parallel in the battery device.

[0136] Among them, the battery device can be an energy storage device such as a battery pack or a battery cabinet.

[0137] In addition, the embodiment of the present application also provides an electrical equipment, including an electrical device and the battery device described in any of the above embodiments or the above-mentioned battery 300, and the battery device or the battery 300 is used to provide electrical energy for the electrical device.

[0138] The electrical equipment in the embodiments of the present application may be a vehicle. For example, the vehicle may be a fuel vehicle, a gas vehicle, or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle, an extended-range vehicle, etc. Correspondingly, the electrical device may be a driving mechanism of the vehicle or a control system of the vehicle.

[0139] In addition, the electrical equipment may also be other equipment, such as a mobile phone, a portable device, a laptop computer, an electric toy, an electric tool, a ship, a spacecraft, etc. Among them, the spacecraft may include an airplane, a rocket, a space shuttle, or a spaceship.

[0140] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application and are not intended to limit them. Although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features. 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 sealing assembly, characterized in that, Comprising: A cover plate (10), the cover plate (10) being provided with a liquid injection hole (11); A sealing nail (20), the sealing nail (20) being disposed in the liquid injection hole (11), the sealing nail (20) having a sealing surface (201), the sealing surface (201) being used for sealing the liquid injection hole (11); A sealing cover (30), the sealing cover (30) covering the sealing nail (20); Wherein, along the axial direction of the liquid injection hole, the distance from the cut-off end of the sealing surface (201) to the liquid outlet of the liquid injection hole (11) is W1, and the distance between the two opposite side surfaces of the sealing nail (20) and the sealing cover (30) is W2; W1 and W2 satisfy: W1≥W2.

2. The cover plate sealing assembly according to claim 1, wherein The cover plate (10) is provided with a second sinking groove (112) arranged around the liquid injection hole (11), the sealing nail (20) includes a sealing nail edge (21) and a sealing nail post (22), the sealing nail edge (21) is disposed in the second sinking groove (112), the sealing nail edge (21) is connected to one end of the sealing nail post (22) close to the sealing cover (30), the other end of the sealing nail post (22) passes through the liquid injection hole (11), and the sealing surface (201) is configured as the outer peripheral surface of the sealing nail post (22).

3. The cover plate sealing assembly according to claim 2, wherein, The cover plate (10) is provided with a first sinking groove (111) arranged around the second sinking groove (112), the sealing cover (30) is disposed in the first sinking groove (111) to seal the liquid injection hole (11) and the sealing nail (20), along the axial direction of the liquid injection hole, the first sinking groove (111), the second sinking groove (112) and the liquid injection hole (11) are arranged in sequence.

4. The cover plate sealing assembly according to claim 3, wherein, The side of the sealing cover (30) facing the sealing nail (20) is provided with a groove (31), the orthographic projection of the sealing nail (20) on the projection plane is located within the orthographic projection of the groove (31) on the projection plane, the projection plane is perpendicular to the axial direction of the liquid injection hole (11), and the distance between the two opposite side surfaces of the sealing nail (20) and the sealing cover (30) is the distance between the side surface of the sealing nail edge (21) and the bottom of the groove (31).

5. The cover plate sealing assembly according to claim 4, characterized in that, Along the axial direction of the liquid injection hole (11), the total thickness of the sealing cover (30) is a, the depth of the groove (31) is b, the thickness of the sealing nail edge (21) is c, the distance from the cut-off end to the sealing nail edge (21) is d, the depth of the first sinking groove (111) is L1, the depth of the second sinking groove (112) is L2, the depth of the liquid injection hole (11) is L3, and X is the root mean square of the dimensional tolerance values of a, b, c, d, L1, L2 and L3; W1, a, b, c, d, L1, L2, L3 and X satisfy: W1=(a - b + c + d - L1 - L2 - L3 - X)≥0.

6. The cover plate sealing assembly according to claim 5, wherein, Along the axial direction of the liquid injection hole (11), the total length of the sealing nail (20) is L4; W1 and L4 satisfy: W1≥15%L4.

7. The cover plate sealing assembly according to claim 2, wherein Along the direction away from the sealing nail edge (21), the cross-sectional area of the sealing nail post (22) gradually decreases.

8. The cover plate sealing assembly according to claim 2, wherein The diameter of the sealing nail along (21) is R1, and the aperture diameter of the liquid injection hole (11) is R2; R1 and R2 satisfy: R1 ≥ 130%R2.

9. The cover plate sealing assembly according to claim 2, wherein The aperture diameter of the liquid injection hole (11) is R2, and the diameter of the cut-off end is R3; R2 and R3 satisfy: R3 ≥ 104%R2.

10. The cover plate sealing assembly according to any one of claims 2-9, characterized in that, The sealing nail (20) further includes a nail body (23), the nail body (23) is connected to one end of the sealing nail along (21) close to the sealing nail column (22), and the sealing nail column (22) is sleeved on the outer periphery of the nail body (23).

11. The cover plate sealing assembly according to claim 10, characterized in that, A buckle (233) is provided on the nail body (23), a clamping groove (242) is provided in the sealing nail column (22), and the buckle (233) is clamped in the clamping groove (242).

12. The cover plate sealing assembly according to claim 10, wherein, The sealing nail along (21) and the nail body (23) are an integrally formed part made of plastic material, and / or the sealing nail column (22) is made of rubber material.

13. The cover plate sealing assembly according to any one of claims 2-9, characterized in that, The sealing nail along (21) and the sealing nail column (22) are an integrally formed part made of rubber material.

14. A battery, characterized in that, Comprising: A housing (301); A battery cell (302), the battery cell (302) is arranged in the housing (301); The cover plate sealing assembly (100) according to any one of claims 1-13, the cover plate sealing assembly (100) covers the opening of the housing (301) to seal the battery cell (302).

15. A battery device, characterized in that, Comprising at least one battery (300) according to claim 14.

16. An electrical device, characterized in that, Comprising the battery device according to claim 15 or the battery (300) according to claim 14.

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