Liquid injection hole sealing element, battery top cover, battery and sealing jig

Abstract

The invention belongs to the technical field of batteries, and discloses a liquid injection hole sealing element, a battery top cover, a battery and a sealing jig, the liquid injection hole sealing element is arranged on a top cover sheet, the top cover sheet is provided with a liquid injection hole, the liquid injection hole sealing element comprises a sealing part and a connecting part, the sealing part is at least partially arranged in the liquid injection hole, and the sealing part is in interference fit with the liquid injection hole; the connecting part is connected with one end, deviating from the liquid injection hole, of the sealing part and is hermetically connected with the top cover sheet; the projection of the sealing part in the thickness direction of the top cover piece is located in the projection of the outer edge of the connecting part in the thickness direction of the top cover piece. Therefore, the sealing part is in interference fit with the liquid injection hole, so that the liquid injection hole can be sealed when the sealing part is connected with the top cover piece, the arrangement of a plastic nail is omitted, the overall structure and the assembly process of the liquid injection hole sealing element are simplified, and good sealing performance is kept.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a liquid injection hole sealing component, a battery top cover, a battery and a sealing fixture. Background Art

[0002] The battery comprises a battery top cover, a shell and a battery cell. The battery cell is located inside the shell. The battery top cover and the shell enclose a space for accommodating the battery cell, and the battery top cover is provided with an injection hole for injecting electrolyte.

[0003] After the battery is filled with liquid, the injection hole is usually sealed with a plastic nail, and then an aluminum nail cover is placed on top of the plastic nail, and the outer edge of the aluminum nail is welded to the battery top cover, so that the aluminum nail and the plastic nail are fixed on the battery top cover to prevent the electrolyte inside the shell from leaking to the outside through the injection hole. However, in the process of sealing the injection hole, there may be risks such as missing plastic nails or plastic nails not being assembled in place, which will affect the sealing performance. In addition, the structure of the aluminum nail and the plastic nail is relatively complex, there are many assembly steps, and the process cost is relatively high. Summary of the invention

[0004] The object of the present invention is to provide a liquid injection hole sealing member, a battery top cover, a battery and a sealing fixture to solve the problems that the sealing structure of the liquid injection hole is relatively complex, the assembly process is relatively large, and the sealing performance is unstable.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] In a first aspect, a liquid injection hole seal is provided on a top cover sheet, wherein the top cover sheet is provided with a liquid injection hole, and the liquid injection hole seal comprises: a sealing portion, wherein the sealing portion is at least partially disposed in the liquid injection hole, and the sealing portion is interference fit with the liquid injection hole; a connecting portion, wherein the connecting portion is connected to an end of the sealing portion away from the liquid injection hole, and the connecting portion is sealingly connected to the top cover sheet; the projection of the sealing portion in the thickness direction of the top cover sheet is located inside the projection of the outer edge of the connecting portion in the thickness direction of the top cover sheet.

[0007] Preferably, the sealing portion and the connecting portion are coaxially arranged, and one end of the connecting portion away from the sealing portion is welded to the top cover sheet.

[0008] Preferably, the diameter of the injection hole is 3 mm, and its symmetry tolerance is ±0.03 mm; the outer diameter of the sealing portion is 3.03 mm, and its upper limit tolerance is 0.05 mm and the lower limit tolerance is 0.

[0009] In a second aspect, a battery top cover comprises a top cover sheet and the above-mentioned liquid injection hole sealing member, wherein the top cover sheet is provided with a connecting groove whose shape matches the connecting portion, and the connecting groove is connected to the liquid injection hole.

[0010] Preferably, the diameter of the connecting portion at one end away from the injection hole is larger than the diameter at one end toward the injection hole, and the minimum diameter of the connecting portion is larger than the aperture of the injection hole.

[0011] Preferably, the sealing portion is provided with a first groove, the connecting portion is provided with a second groove, the first groove and the second groove are coaxially arranged, and the inner diameter of the first groove is smaller than the aperture of the injection hole.

[0012] Preferably, the connecting portion is provided with a first welding area and a second welding area, the first welding area is arranged at the outer edge of the connecting portion, the second welding area is arranged at the outer edge of the second groove, and the connecting portion is welded to the top cover sheet at positions corresponding to the first welding area and the second welding area.

[0013] In a third aspect, a battery comprises a shell, a battery cell and the battery top cover as described above, wherein the battery cell is arranged inside the shell, and the top cover sheet and the shell are enclosed to form a space for accommodating the battery cell.

[0014] In a fourth aspect, a sealing jig is provided for assembling the battery top cover as described above, wherein the sealing portion is provided with a first groove, and the sealing jig includes a push rod, wherein the cross-sectional area of ​​one end of the push rod facing the injection hole seal is smaller than the cross-sectional area of ​​the first groove, and the push rod is slidably connected to the sealing portion so that the push rod can extend into or withdraw from the first groove.

[0015] Preferably, the sealing jig further comprises a pressing plate, and the pressing plate is selectively connected to the connecting portion.

[0016] Beneficial effects of the present invention:

[0017] The injection hole sealing member is arranged on the top cover sheet, and the top cover sheet is provided with the injection hole. The injection hole sealing member comprises a sealing portion and a connecting portion. The sealing portion is at least partially arranged in the injection hole, and the sealing portion is interference fit with the injection hole; the connecting portion is connected to an end of the sealing portion away from the injection hole, and the connecting portion is sealingly connected to the top cover sheet; the projection of the sealing portion in the thickness direction of the top cover sheet is located inside the projection of the outer edge of the connecting portion in the thickness direction of the top cover sheet.

[0018] In this way, since the sealing part is interference fit with the injection hole and is located inside the injection hole, and the connecting part is sealed and connected to the top cover sheet, the injection hole can be sealed, and the provision of glue nails is omitted, thereby simplifying the overall structure and assembly process of the injection hole seal, so that the injection hole seal can perform multiple sealing on the injection hole, maintain good sealing performance and reduce process costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a side sectional view of a battery top cover in one embodiment of the present invention;

[0020] Figure 2 In one embodiment of the present invention Figure 1 A magnified image of point A;

[0021] Figure 3 2 is a schematic structural diagram of a liquid injection hole sealing member according to an embodiment of the present invention;

[0022] Figure 4 is a first structural schematic diagram of a battery top cover in one embodiment of the present invention;

[0023] Figure 5 is a second structural schematic diagram of a battery top cover in one embodiment of the present invention;

[0024] Figure 6 It is a side cross-sectional view of a battery top cover for showing the top cover and the pressure plate in one embodiment of the present invention.

[0025] In the figure:

[0026] 1. Sealing part; 11. First groove; 2. Connecting part; 21. Second groove; 3. Top cover plate; 31. Liquid injection hole; 32. Connecting groove; 4. Lower plastic; 41. Reinforcement part; 5. Push rod; 6. Press plate. DETAILED DESCRIPTION

[0027] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0028] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0030] In the description of this embodiment, the terms "upper", "lower", "right", etc., directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0031] See also Figure 1 and Figure 2 The present invention provides a liquid injection hole sealing member, which is arranged on a top cover sheet 3. The top cover sheet 3 is provided with a liquid injection hole 31. The liquid injection hole sealing member comprises a sealing portion 1 and a connecting portion 2. The sealing portion 1 is at least partially arranged in the liquid injection hole 31, and the sealing portion 1 is interference fit with the liquid injection hole 31; the connecting portion 2 is connected to an end of the sealing portion 1 away from the liquid injection hole 31, and the connecting portion 2 is sealed and connected to the top cover sheet 3; the projection of the sealing portion 1 in the thickness direction of the top cover sheet 3 is located inside the projection of the outer edge of the connecting portion 2 in the thickness direction of the top cover sheet 3.

[0032] In this embodiment, the sealing part 1 and the connecting part 2 are both made of aluminum material, the sealing part 1 and the connecting part 2 are integrally formed and connected, the outer edge of the connecting part 2 is sealed and connected to the top cover sheet 3, the sealing part 1 protrudes from one end of the connecting part 2 facing the injection hole 31, the end surface of the sealing part 1 facing away from the connecting part 2 is located inside the injection hole 31, and the end surface of the connecting part 2 facing away from the sealing part 1 is lower than the side surface on the same side of the top cover sheet 3, that is, the two sides of the top cover sheet 3 protrude from the connecting part 2 and the sealing part 1 respectively.

[0033] In this way, since the sealing part 1 is located inside the injection hole 31 and has an interference fit with the injection hole 31, the sealing part 1 can seal the injection hole 31, and the outer edge of the connecting part 2 is sealed and connected to the top cover sheet 3, which can further seal the injection hole 31, eliminating the need for setting up glue nails, thereby simplifying the overall structure and assembly process of the injection hole seal, reducing the process cost, and at the same time enabling the injection hole seal to be sealed and connected to the injection hole 31 to maintain good sealing performance.

[0034] See also Figure 2 and Figure 3 In some embodiments, the sealing part 1 and the connecting part 2 are coaxially arranged, and the end of the connecting part 2 away from the sealing part 1 is welded to the top cover sheet 3. In this embodiment, the diameter of the sealing part 1 is smaller than the diameter of the connecting part 2, and the axis of the sealing part 1 is parallel to the thickness direction of the top cover sheet 3.

[0035] In this way, by making the end of the sealing part 1 away from the connecting part 2 have an interference fit with the injection hole 31 and welding the end of the connecting part 2 away from the sealing part 1 to the top cover sheet 3, a double seal can be formed to avoid leakage of electrolyte and improve the sealing performance of the injection hole seal; since the setting of the rubber nail is saved, it is only necessary to insert the sealing part 1 into the injection hole 31 and weld the connecting part 2, which simplifies the assembly process and reduces the mold opening cost of the rubber nail, thereby reducing the process cost.

[0036] It is understandable that the sealing part 1 and the connecting part 2 may also be arranged non-coaxially. In this embodiment, the coaxial arrangement is for the convenience of processing and assembling the injection hole seal. The relative positions of the sealing part 1 and the connecting part 2 can be adjusted according to actual needs, which are not listed in detail here.

[0037] See also Figure 2 In some embodiments, the diameter of the injection hole 31 is 3 mm, and its symmetry tolerance is ±0.03 mm. The outer diameter of the sealing part 1 is 3.03 mm, and its upper limit tolerance is 0.05 mm, and the lower limit tolerance is 0, so as to achieve an interference fit between the sealing part 1 and the injection hole 31.

[0038] It is understandable that the outer diameter of the sealing portion 1 can be flexibly adjusted according to the specifications of the injection hole 31, which will not be elaborated here.

[0039] See also Figure 2-Figure 4 The present invention further provides a battery top cover, including a top cover sheet 3 and a liquid injection hole seal, wherein the top cover sheet 3 is provided with a connecting groove 32 whose shape matches the connecting portion 2, and the connecting groove 32 is connected to the liquid injection hole 31.

[0040] In this embodiment, the top cover sheet 3 is made of aluminum material, the sealing part 1 is inserted into the injection hole 31, and the connecting part 2 is located in the connecting groove 32 to limit the sealing part 1 from excessively moving downward, and the outer wall of the connecting part 2 abuts against the inner wall of the connecting groove 32.

[0041] In this way, when the injection hole seal is assembled to the top cover piece 3, the sealing part 1 is extended into the injection hole 31 and interference fits with the injection hole 31, and the bottom surface of the connecting part 2 is abutted against the bottom wall of the connecting groove 32. The connecting part 2 and the top cover piece 3 are welded to achieve the sealing of the injection hole 31. Not only does it save the setting of the glue nails, simplify the overall structure and assembly process of the injection hole seal, but it also has sufficient sealing performance to avoid electrolyte leakage and improve the safety and stability of the top cover piece 3.

[0042] It is understandable that the materials of the top cover sheet 3 and the liquid injection hole seal can be flexibly adjusted. The top cover sheet 3 and the liquid injection hole seal can be made of the same material or different materials, and are not limited to aluminum.

[0043] See also Figure 5 In some embodiments, the battery top cover further includes a lower plastic 4 made of insulating material, the length direction of the lower plastic 4 is parallel to the length direction of the top cover sheet 3, and a reinforcing portion 41 is further provided at the position of the lower plastic 4 corresponding to the injection hole 31. The reinforcing portion 41 is a reinforcing rib structure and is arranged around the injection hole 31 to strengthen the structural strength of the top cover sheet 3 where the injection hole 31 is opened to prevent the top cover sheet 3 from deformation.

[0044] It can be understood that the shape of the reinforcing portion 41 can be flexibly adjusted. In the present embodiment, the reinforcing portion 41 is an arc-shaped reinforcing rib structure, four reinforcing portions 41 are provided, and the four reinforcing portions 41 are circumferentially arranged at equal intervals around the injection hole 31, and the projection of the inner edge of the reinforcing portion 41 in the thickness direction of the top cover sheet 3 is located outside the projection of the outer edge of the connecting portion 2 in the thickness direction of the top cover sheet 3.

[0045] Furthermore, in some embodiments, the sealing portion 1 may be connected to a sealing ring (not shown in the figure), so that when the injection hole seal is assembled to the top cover sheet 3, the sealing ring is located between the connecting portion 2 and the top cover sheet 3.

[0046] In this way, the sealing ring can enhance the sealing performance of the connection between the connecting portion 2 and the bottom wall of the connecting groove 32, thereby enhancing the sealing performance of the liquid injection hole seal, and further avoiding leakage of the electrolyte.

[0047] It can be understood that the sealing ring can be made of an elastic material, for example, a rubber material, and this embodiment does not limit this. The outer diameter of the sealing ring can be equal to the outer diameter of the bottom wall of the connecting portion 2, or can be smaller than the outer diameter of the bottom wall of the connecting portion 2, so that the two sides of the sealing ring can be tightly contacted with the bottom wall of the connecting portion 2 and the bottom wall of the connecting groove 32 respectively. No more examples are given here.

[0048] See also Figure 2 In some embodiments, the diameter of the end of the connecting portion 2 away from the injection hole 31 is larger than the diameter of the end facing the injection hole 31, and the minimum diameter of the connecting portion 2 is larger than the aperture of the injection hole 31. In this embodiment, the connecting portion 2 is a truncated cone structure, the sealing portion 1 is arranged in the middle of the connecting portion 2 and is located on the side of the connecting portion 2 facing the injection hole 31. Correspondingly, the connecting groove 32 is a truncated cone groove, and the diameter of the end of the connecting portion 2 connected to the sealing portion 1 is the smallest and larger than the outer diameter of the sealing portion 1.

[0049] In this way, by providing a truncated cone structure connecting part 2 and a truncated cone shaped connecting groove 32, it is possible to facilitate the assembly of the connecting part 2 into the connecting groove 32, and by observing the relative position of the connecting part 2 and the connecting groove 32, it can be judged whether the connecting part 2 is assembled in place and whether the top surface of the connecting part 2 (that is, the end surface of the connecting part 2 facing away from the sealing part 1) is parallel to the top surface of the top cover sheet 3.

[0050] It is understandable that the shape of the connecting portion 2 may also be a cylindrical structure, and the shape and size of the connecting portion 2 may be adjusted according to actual needs.

[0051] Furthermore, in some embodiments, a limiting block (not shown in the figure) may be provided on the side of the connecting part 2 facing the sealing part 1, and a limiting groove corresponding to the limiting block is provided on the bottom wall of the connecting groove 32, so that after the limiting block is inserted into the limiting groove, the relative position of the connecting part 2 and the connecting groove 32 is limited, and the anti-twisting performance and sealing performance of the connecting part 2 can be improved.

[0052] It is understandable that the number of the limiting blocks can be one or more and can be arranged around the sealing portion 1, so as to achieve the connection portion 2 being fixed on the top cover sheet 3, and no more examples are given here.

[0053] See also Figure 2 In some embodiments, the sealing portion 1 is provided with a first groove 11 , the connecting portion 2 is provided with a second groove 21 , the first groove 11 and the second groove 21 are coaxially arranged, and the inner diameter of the first groove 11 is smaller than the aperture of the injection hole 31 .

[0054] In this embodiment, the first groove 11 is opened at one end of the sealing portion 1 toward the connecting portion 2, and the second groove 21 is opened at one end of the connecting portion 2 away from the injection hole 31. The two ends of the second groove 21 have a smooth transition, and the length directions of the first groove 11 and the second groove 21 are parallel to the thickness direction of the top cover sheet 3. The first groove 11 is connected to the second groove 21, and the length of the first groove 11 is greater than the length of the second groove 21.

[0055] In this way, by providing the first groove 11 and the second groove 21, not only the overall weight of the injection hole seal can be reduced, but also the sealing part 1 can be easily extended into the interior of the injection hole 31, and the connecting part 2 can be tightly abutted against the inner wall of the connecting groove 32, which is beneficial to assemble the injection hole seal in place, simplify the assembly process, improve the assembly efficiency, and improve the sealing performance of the injection hole seal to prevent the electrolyte from leaking to the outside through the injection hole 31.

[0056] It is understandable that the shapes and locations of the first groove 11 and the second groove 21 can be flexibly adjusted, and no further details are given here.

[0057] See also Figure 2In some embodiments, the connecting portion 2 is provided with a first welding area (not shown in the figure) and a second welding area (not shown in the figure), the first welding area is provided at the outer edge of the connecting portion 2, and the second welding area is provided at the outer edge of the second groove 21, and the connecting portion 2 is welded to the top cover sheet 3 at positions corresponding to the first welding area and the second welding area.

[0058] In this embodiment, the position of the connection part 2 corresponding to the first welding area is fixedly connected to the top cover sheet 3 through a seam welding process, and the position of the connection part 2 corresponding to the second welding area is fixedly connected to the top cover sheet 3 through penetration welding.

[0059] In this way, the positions of the connecting part 2 corresponding to the first welding area and the second welding area are connected to the top cover sheet 3 by welding, which not only can realize the limiting of the injection hole seal, but also can make the injection hole seal realize three-layer sealing through the welding of the first welding area and the top cover sheet 3, the welding of the second welding area and the top cover sheet 3, and the interference fit of the sealing part 1 and the injection hole 31, further enhance the sealing performance of the injection hole seal, and avoid the connection part 2 from falling off or shifting from the top cover sheet 3, thereby improving the safety and stability of the battery top cover.

[0060] It is understandable that only the first welding area or only the second welding area can be set on the connecting part 2. The positions of the first welding area and the second welding area can be flexibly adjusted and are not limited to the outer edge of the connecting part 2 and the outer edge of the second groove 21, which will not be elaborated here.

[0061] See also Figure 4 The present invention also provides a battery, including a shell (not shown in the figure), a battery cell (not shown in the figure) and a battery top cover, the battery cell is arranged inside the shell, and the top cover sheet 3 and the shell are enclosed to form a space for accommodating the battery cell.

[0062] In this embodiment, the top cover sheet 3 is arranged above the shell and welded to the shell so that the top cover sheet 3 and the shell are enclosed to form a closed space and protect the battery cell. The connecting portion 2 is arranged at the end of the sealing portion 1 away from the battery cell, and when the injection hole sealing member is arranged on the top cover sheet 3, the connecting portion 2 is connected to the side of the top cover sheet 3 away from the battery cell, and the connecting groove 32 is arranged on the side of the injection hole 31 away from the battery cell.

[0063] In this way, by assembling the injection hole seal to the top cover sheet 3, the injection hole 31 can be sealed, the setting of the glue nails is saved, the assembly process is simplified, and the injection hole seal has good sealing performance.

[0064] See also Figure 6The present invention also provides a sealing jig for assembling a battery top cover, the sealing jig comprising a push rod 5, the cross-sectional area of ​​the push rod 5 at one end of the injection hole seal is smaller than the cross-sectional area of ​​the first groove 11, and the push rod 5 is slidably connected to the sealing portion 1 so that the push rod 5 extends into or out of the first groove 11.

[0065] In this embodiment, the inner diameter of the first groove 11 is 2 mm, and its symmetry tolerance is 0.03 mm. The length direction of the push rod 5 is parallel to the thickness direction of the top cover sheet 3, and the diameter of one end of the push rod 5 facing the first groove 11 is 1.9 mm, and its symmetry tolerance is 0.03 mm. That is, when the push rod 5 is located in the first groove 11, there is a gap between the push rod 5 and the groove wall of the first groove 11.

[0066] In this way, the staff can complete the preliminary assembly by setting the sealing part 1 in the injection hole 31 with an interference fit, and extend the push rod 5 into the first groove 11, and continue to apply a downward force to the sealing part 1, so that the sealing part 1 is tightly fitted with the injection hole 31 and installed in place. Since the sealing part 1 and the injection hole 31 have an interference fit, when the push rod 5 applies a force to the sealing part 1, the inner wall of the first groove 11 can be deformed and fit with the inner wall of the injection hole 31 and the outer wall of the push rod 5 respectively, thereby improving the sealing performance of the connection between the sealing part 1 and the injection hole 31. After the sealing part 1 is installed in place, the push rod 5 is removed from the first groove 11, and the first welding area and the second welding area of ​​the connecting part 2 are welded to complete the assembly of the injection hole seal.

[0067] It can be understood that the diameter of the push rod 5 can also be equal to the inner diameter of the first groove 11. In this embodiment, the diameter of the push rod 5 is slightly smaller than the inner diameter of the first groove 11. The purpose is to enable the push rod 5 to smoothly enter the first groove 11 and apply a downward force to the sealing part 1. The specific specifications of the push rod 5 can be adjusted according to the specifications of the first groove 11, and no further examples are listed here.

[0068] See also Figure 6 In some embodiments, the sealing fixture further comprises a pressing plate 6, which is selectively connected to the connecting portion 2. The pressing plate 6 can selectively abut against the end surface of the connecting portion 2 away from the sealing portion 1, and the pressing plate 6 is an annular structure for the ejector rod 5 to pass through and abut against the groove wall of the first groove 11.

[0069] In this way, when the push rod 5 pushes the sealing part 1 to be assembled into place, the push rod 5 may bring the injection hole seal out of the injection hole 31 due to the close fit with the sealing part 1 during the process of upwardly withdrawing from the first groove 11. Therefore, the pressure plate 6 can abut against the connecting part 2 to fix the positions of the connecting part 2 and the sealing part 1 on the top cover sheet 3, so that the push rod 5 can smoothly withdraw from the first groove 11, thereby improving the assembly efficiency of the injection hole seal.

[0070] Further, in some embodiments, the push rod 5 is connected to a first driving member, and the pressure plate 6 is connected to a second driving member, wherein the first driving member and the second driving member are both cylinders to drive the push rod 5 and the pressure plate 6 to move in the vertical direction.

[0071] It can be understood that the push rod 5 and the pressure plate 6 can also be manually operated by the staff. In this embodiment, the first driving member and the second driving member are used to drive the movement of the push rod 5 and the pressure plate 6 in order to facilitate the control of the moving distance and moving direction of the push rod 5 and the pressure plate 6. This embodiment does not limit the movement method of the push rod 5 and the pressure plate 6.

[0072] The assembly process of the filling hole seal is as follows:

[0073] Insert the sealing part 1 into the injection hole 31 to make an interference fit between the sealing part 1 and the injection hole 31, insert the push rod 5 into the first groove 11 and apply downward pressure on the sealing part 1, so that the sealing part 1 further abuts tightly against the injection hole 31, cover the pressure plate 6 on the connecting part 2 and limit the position of the injection hole seal on the top cover sheet 3, and withdraw the push rod 5 from the first groove 11 to complete the preliminary assembly of the injection hole seal.

[0074] The connection part 2 is seam welded at a position corresponding to the first welding area, and the connection part 2 is penetrated welded at a position corresponding to the second welding area, so that the connection part 2 is sealed with the top cover sheet 3 and the injection hole 31 is sealed by the injection hole seal.

[0075] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A liquid injection hole sealing member, characterized in that: The top cover sheet (3) is provided with a liquid injection hole (31), and the liquid injection hole sealing member comprises: A sealing portion (1), wherein at least a portion of the sealing portion (1) is disposed in the liquid injection hole (31), and the sealing portion (1) and the liquid injection hole (31) are in interference fit; A connecting portion (2), the connecting portion (2) being connected to an end of the sealing portion (1) away from the liquid injection hole (31), and the connecting portion (2) being sealingly connected to the top cover sheet (3); The projection of the sealing portion (1) in the thickness direction of the top cover sheet (3) is located inside the projection of the outer edge of the connecting portion (2) in the thickness direction of the top cover sheet (3).

2. The liquid injection hole sealing member according to claim 1, characterized in that: The sealing portion (1) and the connecting portion (2) are coaxially arranged, and one end of the connecting portion (2) facing away from the sealing portion (1) is welded to the top cover sheet (3).

3. The liquid injection hole sealing member according to claim 1, characterized in that: The diameter of the injection hole (31) is 3 mm, and its symmetry tolerance is ±0.03 mm. The outer diameter of the sealing portion (1) is 3.03 mm, and its upper limit tolerance is 0.05 mm, and its lower limit tolerance is 0.

4. A battery top cover, characterized in that: It comprises a top cover sheet (3) and a liquid injection hole sealing member as claimed in any one of claims 1 to 3, wherein the top cover sheet (3) is provided with a connecting groove (32) whose shape matches that of the connecting portion (2), and the connecting groove (32) is connected to the liquid injection hole (31).

5. The battery top cover according to claim 4, characterized in that: The diameter of the end of the connecting portion (2) away from the injection hole (31) is larger than the diameter of the end facing the injection hole (31), and the minimum diameter of the connecting portion (2) is larger than the hole diameter of the injection hole (31).

6. The battery top cover according to claim 4, characterized in that: The sealing portion (1) is provided with a first groove (11), and the connecting portion (2) is provided with a second groove (21); the first groove (11) and the second groove (21) are coaxially arranged, and the inner diameter of the first groove (11) is smaller than the hole diameter of the injection hole (31).

7. The battery top cover according to claim 6, characterized in that: The connecting portion (2) is provided with a first welding area and a second welding area, the first welding area is provided at the outer edge of the connecting portion (2), the second welding area is provided at the outer edge of the second groove (21), and the connecting portion (2) is welded to the top cover sheet (3) at positions corresponding to the first welding area and the second welding area.

8. A battery, characterized in that: It comprises a shell, a battery cell and a battery top cover as claimed in any one of claims 4 to 7, wherein the battery cell is arranged inside the shell, and the top cover sheet (3) and the shell are enclosed to form a space for accommodating the battery cell.

9. A sealing jig, characterized in that: Used for assembling the battery top cover as described in any one of claims 4 to 7, the sealing portion (1) is provided with a first groove (11), the sealing fixture includes a push rod (5), the cross-sectional area of ​​the push rod (5) at one end facing the injection hole seal is smaller than the cross-sectional area of ​​the first groove (11), and the push rod (5) is slidably connected to the sealing portion (1) so that the push rod (5) extends into or out of the first groove (11).

10. The sealing jig according to claim 9, characterized in that: The sealing jig further comprises a pressing plate (6), and the pressing plate (6) is selectively connected to the connecting portion (2).

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