Battery top cover and battery

Abstract

The utility model provides a battery top cover and a battery, the battery top cover comprises a top cover piece, a sealing piece and a shielding piece, the top cover piece is provided with a liquid injection hole, and the liquid injection hole comprises a first diameter expansion section and a diameter shrinkage section which are sequentially connected in the axial direction; the sealing piece is arranged in the reducing section in a penetrating mode and comprises a first large-diameter section, a small-diameter section and a second large-diameter section which are sequentially connected in the axial direction, step structures are formed between the first large-diameter section and the small-diameter section and between the small-diameter section and the second large-diameter section, and the step structures abut against the end face of the reducing section; the shielding piece covers the opening of the liquid injection hole, shields and abuts against the sealing piece, and is connected with the inner wall of the liquid injection hole. The problem that in the prior art, fixing reliability of sealing colloidal particles is low is solved.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more specifically, to a battery top cover and a battery. Background Technology

[0002] A battery generally consists of a cell, a metal casing to house the cell, and a top cover. The cell has a positive and a negative tab on its top, while the top cover has a positive terminal, a negative terminal, an electrolyte filling hole, and an explosion-proof valve. During assembly, the positive and negative tabs are first welded to the positive and negative terminals, respectively. Then, the cell is placed inside the casing, and the top cover is welded to the casing to seal it, assembling a semi-finished battery. This is followed by a series of processes including electrolyte filling, formation, and capacity testing to obtain the final battery. Currently, after electrolyte filling, sealing granules and aluminum nails are inserted into the filling hole to seal it. Most sealing granules are currently designed as near-cylindrical objects, posing a risk of them falling into the cell during insertion. Furthermore, most aluminum nails have a flat-opening design, making them susceptible to being dislodged by cell vibrations when not welded. Utility Model Content

[0003] The main objective of this application is to provide a battery top cover and a battery to solve the problem of low fixation reliability of sealing particles in the prior art.

[0004] To achieve the above objectives, according to one aspect of this application, a battery top cover is provided, including a top cover sheet, a seal, and a shield. The top cover sheet has an injection hole, which includes a first expanding section and a reducing section connected axially in sequence. The seal is disposed within the reducing section and includes a first large-diameter section, a small-diameter section, and a second large-diameter section connected axially in sequence. A stepped structure is formed between the first large-diameter section and the small-diameter section, and between the small-diameter section and the second large-diameter section. The stepped structure abuts against the end face of the reducing section. The shield is disposed at the opening of the injection hole and abuts against the seal. The shield is connected to the inner wall of the injection hole.

[0005] Instruction manual PN279745HZYWDL

[0006] Furthermore, compared to the second large diameter section, the first large diameter section is closer to the shielding member, while the end face of the second large diameter section away from the first large diameter section has a bevel structure, and along the direction closer to the first large diameter section, the bevel structure is inclined in a direction away from the central axis of the seal.

[0007] Furthermore, there are multiple inclined structures, with each inclined structure spaced apart along the circumference of the seal.

[0008] Furthermore, the included angle A formed between the inclined structure and the axis of the injection hole is greater than or equal to 20° and less than or equal to 45°; and / or the inclined structure is continuously arranged along the circumference of the seal and is tapered.

[0009] Furthermore, a positioning structure is provided between the seal and the shield. When the shield blocks the seal, the shield is positioned and engaged with the seal through the positioning structure.

[0010] Furthermore, the positioning structure includes a positioning protrusion and a positioning recess. One of the sealing member and the blocking member is provided with a positioning protrusion, and the other of the sealing member and the blocking member is provided with a positioning recess. When the blocking member blocks the sealing member, the positioning protrusion is located in the positioning recess.

[0011] Furthermore, the shielding component includes a first segment and a second segment connected axially in sequence. The diameter of the first segment is larger than the diameter of the second segment. The injection hole also includes a second expansion segment. The second expansion segment is located at the end of the first expansion segment away from the reduction segment. The shielding component covers the second expansion segment. The step surface between the first segment and the second segment, and the step surface between the second expansion segment and the first expansion segment, abut against each other.

[0012] Furthermore, along the axial direction of the injection hole, the thickness of the top cover plate is L, the length of the seal is L1, and 1 / 3L≤L1≤3 / 4L, the length of the small diameter section is 40%-60%L, the length of the first large diameter section is 5%-20%L1, and the length of the second large diameter section is 5%-20%L1.

[0013] Furthermore, the diameter of the narrowing section is D, the diameter of the first large diameter section is D1, and the diameter of the small diameter section is D2, where D < D2 ≤ D + 0.5 mm, and D2 + 0.5 mm < D1 < D2 + 2 mm.

[0014] Instruction manual PN279745HZYWDL

[0015] Furthermore, the shielding component includes a first segment and a second segment connected sequentially in the axial direction. The diameter of the first segment is larger than the diameter of the second segment. The circumferential side of the first segment is welded to the inner wall of the injection hole. Along the axial direction of the injection hole, the thickness of the top cover is L, the diameter of the reduced diameter section is D, the length of the first segment is h, and the diameter of the first segment is φ, where 3 / 2D < φ < 3D, and 1 / 4L ≤ h ≤ 1 / 2L.

[0016] According to another aspect of this application, a battery is provided, including a housing and the aforementioned battery top cover, the battery top cover sealing the opening of the housing.

[0017] By applying the technical solution of this application, on the one hand, by setting the first large-diameter section and the second large-diameter section, both ends of the seal form a stepped structure, thereby abutting against the end faces of the two ends of the narrowed section of the injection hole, thus avoiding the risk of the seal falling into the top cover plate when it is installed in the injection hole. On the other hand, by setting the shielding part, the seal is prevented from falling off the outside of the top cover plate. In this way, the reliability of the seal and the top cover plate is improved, and the sealing effect of the seal is enhanced, thereby improving the stability of the battery. Attached Figure Description

[0018] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings:

[0019] Figure 1 An isometric view of the battery top cover is shown;

[0020] Figure 2 A cross-sectional view of the battery top cover is shown;

[0021] Figure 3 A cross-sectional view of the top cover plate is shown;

[0022] Figure 4 An isometric view of the seal and shield is shown;

[0023] Figure 5 A cross-sectional view of the seal and shield is shown;

[0024] Instruction manual PN279745HZYWDL

[0025] Figure 6 An isometric view of the shielding component is shown;

[0026] Figure 7 The front view of the shielding component is shown;

[0027] Figure 8 An isometric view of the seal is shown;

[0028] Figure 9 A front view of the seal is shown;

[0029] Figure 10 It shows Figure 9 A cross-sectional view of BB.

[0030] The above figures include the following reference numerals:

[0031] 10. Top cover plate; 11. Injection hole; 111. First expansion section; 112. Reduction section; 113. Second expansion section; 20. Seal; 21. First large diameter section; 22. Small diameter section; 23. Second large diameter section; 231. Sloping structure; 24. Positioning recess; 30. Shielding component; 31. First segment; 32. Second segment; 33. Positioning protrusion. Detailed Implementation

[0032] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0033] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0034] In this application, unless otherwise stated, directional terms such as "upper," "lower," "top," and "bottom" are generally used in relation to the direction shown in the accompanying drawings, or in relation to the vertical, perpendicular, or gravitational direction of the component itself; similarly, for ease of understanding and description, "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not intended to limit this application.

[0035] Instruction manual PN279745HZYWDL

[0036] To address the issue of low fixation reliability of sealing particles in existing technologies, this application provides a battery top cover and a battery.

[0037] like Figures 1 to 10 As shown, a battery top cover includes a top cover plate 10, a sealing element 20, and a shielding element 30. The top cover plate 10 has an injection hole 11, which includes a first expanding section 111 and a reducing section 112 connected axially in sequence. The sealing element 20 passes through the reducing section 112 and includes a first large diameter section 21, a small diameter section 22, and a second large diameter section 23 connected axially in sequence. A stepped structure is formed between the first large diameter section 21 and the small diameter section 22, and between the small diameter section 22 and the second large diameter section 23. The stepped structure abuts against the end face of the reducing section 112. The shielding element 30 covers the opening of the injection hole 11 and shields and abuts against the sealing element 20. The shielding element 30 is connected to the inner wall of the injection hole 11.

[0038] In this embodiment, on the one hand, by setting the first large-diameter section 21 and the second large-diameter section 23, both ends of the sealing member 20 form a stepped structure, thereby abutting against the end faces of the two ends of the narrowed section 112 of the injection hole 11. This avoids the risk of the sealing member 20 falling into the top cover plate 10 when it is installed in the injection hole 11. On the other hand, by setting the shielding member 30, the sealing member 20 is prevented from falling off the outside of the top cover plate 10. In this way, the reliability of the fixing of the sealing member 20 to the top cover plate 10 is improved, and the sealing effect of the sealing member 20 is enhanced, thereby improving the stability of the battery.

[0039] It should be noted that in this embodiment, the top cover 10 and the lower casing of the battery together form the battery casing. The interior of the top cover 10 refers to the cavity in which the battery cells are placed, and the exterior of the top cover 10 refers to the side of the top cover 10 away from the cavity. The orientation of the top cover 10 is not limited; it can be placed horizontally, vertically, or at an angle. This embodiment uses the example of the top cover 10 being placed horizontally with the injection hole 11 axially along the height direction. Figure 2 , Figure 3 As shown, the axial direction of the injection hole 11 is the height direction.

[0040] In this embodiment, the first large-diameter section 21 is closer to the shielding member 30 than the second large-diameter section 23. The end face of the second large-diameter section 23 away from the first large-diameter section 21 has a bevel structure 231. Furthermore, according to the specification PN279745HZYWDL, along the direction closer to the first large-diameter section 21, the bevel structure 231 is inclined away from the central axis of the seal 20, thereby facilitating the installation and fixation of the seal 20. Specifically, as... Figure 3 As shown, the injection hole 11 is a circular hole, and correspondingly, the first large-diameter section 21 and the small-diameter section 22 of the sealing element 20 disposed within the injection hole 11 are also cylindrical structures, such as... Figure 8 As shown, the seal 20 is T-shaped. The first large-diameter section 21 is positioned above the second large-diameter section 23, which is positioned below the injection hole 11. The upper surface of the second large-diameter section 23 abuts against the lower end face of the injection hole 11. The second large-diameter section 23 protrudes radially from the small-diameter section 22, thus acting as a limiting element to prevent the seal 20 from moving upwards and thus preventing it from detaching from above the injection hole 11. The outer circumferential surface of the second large-diameter section 23, which connects to the lower surface of the second large-diameter section 23, has a beveled structure 231, facilitating the insertion of the seal 20 into the injection hole 11 from above and serving as a guide.

[0041] In this embodiment, there are multiple inclined structures 231, and each inclined structure 231 is arranged at intervals along the circumference of the sealing member 20. That is, multiple inclined surfaces are arranged on its circumferential side along the circumference of the second large diameter section 23, so that the sealing member 20 can be smoothly inserted into the injection hole 11. Of course, the inclined surfaces can also be arranged without intervals, and the inclined surfaces can be arranged adjacent to each other along the circumference of the second large diameter section 23.

[0042] like Figure 10 As shown, in this embodiment, the included angle A formed between the inclined structure 231 and the axis of the injection hole 11 is greater than or equal to 20° and less than or equal to 45°, so that the sealing member 20 can be inserted into the injection hole 11 with less effort and without affecting the guiding and limiting effect.

[0043] Preferably, the inclined structure 231 is continuously arranged along the circumference of the seal 20, thereby improving the guiding effect of the second large-diameter section 23. Specifically, as... Figure 9 , Figure 10As shown, in this embodiment, the outer peripheral surface of the second large-diameter section 23 is set as an inclined surface. The distance from the upper end of the inclined surface to the axis of the seal 20 is greater than the distance from the lower end of the inclined surface to the axis of the seal 20, thereby forming an inclined surface structure 231. When the lower end of the inclined surface structure 231 extends to intersect with the axis of the second large-diameter section 23, the lower surface of the second large-diameter section 23 disappears, and the inclined surface structure 231 becomes conical, that is, the second large-diameter section 23 becomes conical. When the lower end of the inclined surface structure 231 intersects with the lower surface of the second large-diameter section 23 at the axial direction of the lower surface, such as... Figure 9 As shown, the second large diameter section 23 is shaped like a frustum, with the smaller diameter of the frustum facing downwards when inserted into the injection hole 11. In this way, the continuous circumferentially arranged inclined surface structure 231 makes it easier and more convenient to insert the seal 20 into the injection hole 11.

[0044] In this embodiment, a positioning structure is provided between the sealing member 20 and the blocking member 30. When the blocking member 30 blocks the sealing member 20, the blocking member 30 is positioned and mated with the sealing member 20 through the positioning structure. The assembled structure is as follows: Figure 4 , Figure 5 As shown, this fixes the radial position of the seal 20, preventing the seal 20 from shaking and affecting the sealing effect. In this way, on the one hand, the shield 30 prevents the seal 20 from falling off the injection hole 11 by being positioned above the seal 20, and on the other hand, it can prevent the seal 20 from shaking in the injection hole 11 through the positioning structure, thereby improving the sealing effect.

[0045] In this embodiment, the positioning structure includes a positioning protrusion 33 and a positioning recess 24. One of the sealing member 20 and the blocking member 30 is provided with the positioning protrusion 33, and the other of the sealing member 20 and the blocking member 30 is provided with the positioning recess 24. When the blocking member 30 blocks the sealing member 20, the positioning protrusion 33 is located within the positioning recess 24, thereby locking the position of the sealing member 20 and improving the sealing effect. Specifically, as follows... Figure 10As shown, in this embodiment, the sealing member 20 is provided with a positioning recess 24, which extends downward from the upper surface of the sealing member 20 and partially penetrates the sealing member 20. The positioning recess 24 is cylindrical and coaxially arranged with the sealing member 20. A positioning protrusion 33 is provided at the lower end of the shielding member 30 and extends along the lower surface of the shielding member 30 towards the sealing member 20. The positioning protrusion 33 is also cylindrical and coaxially arranged with the shielding member 30. The length of the positioning protrusion 33 is not greater than the depth of the positioning recess 24 to ensure that the shielding member 30... The lower surface abuts against the upper surface of the seal 20. The diameter of the positioning protrusion 33 can be slightly larger than the diameter of the positioning recess 24, meaning the positioning protrusion 33 and the positioning recess 24 are in an interference fit. This ensures that the positioning protrusion 33 extends into the positioning recess 24 for positioning, while also preventing the positioning protrusion 33 from easily falling out of the positioning recess 24, thus fixing the shield 30. This allows the shield 30 to be effectively fixed by the seal 20 when not welded. Preferably, the upper end of the positioning recess 24, where the upper surface of the first large diameter section 21 meets the positioning recess 24, is chamfered. This chamfer guides the positioning protrusion 33 when the shield 30 and the seal 20 are engaged, making it easier for the positioning protrusion 33 to extend into the positioning recess 24. Of course, the structure of the positioning recess 24 and the positioning protrusion 33 is not unique. The positioning recess 24 and the positioning protrusion 33 can also be set as a square, hexagonal or other polygonal structure or other irregular structure. They can also be set not coaxially with the sealing element 20 and the shielding element 30, as long as they can cooperate with each other to play a positioning role.

[0046] like Figure 6 , Figure 7 As shown, in this embodiment, the shielding member 30 includes a first segment 31 and a second segment 32 connected axially in sequence. The diameter of the first segment 31 is larger than the diameter of the second segment 32. The injection hole 11 also includes a second enlarged diameter section 113, which is located at the end of the first enlarged diameter section 111 away from the reduced diameter section 112. The shielding member 30 covers the second enlarged diameter section 113. The stepped surfaces between the first segment 31 and the second segment 32, and between the second enlarged diameter section 113 and the first enlarged diameter section 111, abut against each other, thereby sealing the seal 20 within the reduced diameter section 112, improving the stability of the seal 20, and preventing the shielding member 30 from shifting within the injection hole 11, thereby improving the reliability of the seal. Specifically, as... Figure 1As shown, the upper surface of the shield 30 is flush with the upper surface of the top cover 10. The shield 30 is configured as a rotating component, with three cylinders stacked together. The first segment 31 and the second segment 32 are coaxially arranged and positioned above the first large-diameter segment 21. The positioning protrusion 33 is positioned below the second segment 32. The second expanding segment 113, the first expanding segment 111, and the narrowing segment 112 of the injection hole 11 are coaxially arranged, with the second expanding segment 113 located above the first expanding segment 111 and the first expanding segment 111 located above the narrowing segment 112. The narrowing segment 112 serves as the sealing area between the seal 20 and the injection hole 11. Thus, the first segment 31 is used to seal the second segment 21. The two expansion sections 113 are fitted together. Section 31 of the first section 31 is located inside the second expansion section 113. The outer circumference of the first section 31 is fixed to the inner diameter of the second expansion section 113. It can be fixed by welding to prevent the shielding part 30 from falling off the injection hole 11. The second section 32 and the first large diameter section 21 are both located inside the first expansion section 111, and the second section 32 is located above the first large diameter section 21. The outer diameter of the second section 32 is larger than the outer diameter of the first large diameter section 21 and abuts against the first expansion section 111. In addition, the positioning structure makes it impossible for the sealing part 20 to shake radially, thereby improving the positioning and sealing effect. Of course, depending on the size matching of the first large diameter section 21 of the seal 20 and the injection hole 11, the shield 30 may only have the first section 31 and the positioning protrusion 33, without the second section 32. The positioning protrusion 33 is also located below the first section 31 and plays a positioning role. The outer circumferential surface of the first section 31 is fixedly connected to the second enlarged diameter section 113 of the injection hole 11, which can also improve the axial and radial positioning of the seal 20.

[0047] like Figure 2 As shown, in this embodiment, along the axial direction of the injection hole 11, the thickness of the top cover plate 10 is L, the length of the sealing member 20 is L1, and 1 / 3L≤L1≤3 / 4L, thereby reserving installation space for the shielding member 30; the length of the small diameter section 22 is 40%-60%L, to ensure that the length of the small diameter section 22 is within the range of the depth of the injection hole 11, which is the thickness L of the top cover plate 10, thereby ensuring the size of the sealing area and the sealing effect, while reserving space for the first large diameter section 21; the length of the first large diameter section 21 is 5%-20%L1, and the length of the second large diameter section 23 is 5%-20%L1, thus ensuring both the sealing effect and reserving installation space for the shielding member 30 and the first large diameter section 21.

[0048] In this embodiment, the diameter of the reduced diameter section 112 is D, the diameter of the first large diameter section 21 is D1, and the diameter of the small diameter section 22 is D2, wherein D < D2 ≤ D + 0.5 mm, and D2 + 0.5 mm < D1 < D2 + 2 mm. This gap between the small diameter section 22 and the reduced diameter section 112 ensures that when the seal 20 is inserted into the injection hole 11, the small diameter section 22 can smoothly extend into the reduced diameter section 112 to cooperate with it. If the small diameter section 22 is too small, the sealing effect will be reduced; if it is too large, it will be difficult to extend into the reduced diameter section 112. Furthermore, the diameter of the first expanded diameter section 111 is not less than the diameter of the reduced diameter section 112, so that the first expanded diameter section 111 will not extend into the reduced diameter section 112 along with the small diameter section 22, thus ensuring the positioning function of the first expanded diameter section 111.

[0049] In this embodiment, the circumferential side of the first segment 31 is welded to the inner wall of the injection hole 11. Along the axial direction of the injection hole 11, the thickness of the top cover plate 10 is L, the length of the first segment 31 is h, and the diameter of the first segment 31 is φ, where 3 / 2D < φ < 3D. The circumferential side of the first segment 31 serves as the welding area connected to the second expansion section 113. The setting of φ ensures that the circumferential side of the first segment 31 is neither too far nor too close to the injection hole 11 and the second expansion section 113, thus facilitating welding and ensuring the connection quality of the first segment 31 and the second expansion section 113. 1 / 4L ≤ h ≤ 1 / 2L. Since the first segment 31 is a cylinder, the length of the first segment 31 is also the height of the cylinder. In this embodiment, the setting of the size of h makes it easy for the welding operator to adjust the welding penetration and ensure the welding quality.

[0050] This embodiment also provides a battery, including a housing and the aforementioned battery top cover, wherein the housing has an opening, and the battery top cover seals the opening of the housing to achieve a closed housing.

[0051] It should be noted that "multiple" in the above embodiments refers to at least two.

[0052] As can be seen from the above description, the embodiments of this application achieve the following technical effects:

[0053] 1. This solves the problem of low fixing reliability of sealing granules in existing technologies;

[0054] 2. By setting the first and second large diameter sections, both ends of the seal form a stepped structure, which abuts against the end faces of the reduced diameter section of the injection hole, thus avoiding the risk of the seal falling into the top cover plate when it is installed in the injection hole.

[0055] 3. By installing a shielding component, the seal is prevented from falling off the outside of the top cover plate;

[0056] 4. It improves the reliability of fixing the seal to the top cover plate and enhances the sealing effect of the seal, thereby improving the stability of the battery.

[0057] Instruction manual PN279745HZYWDL

[0058] Obviously, the embodiments described above are only some, not all, of the embodiments in this application. All other embodiments obtained by those skilled in the art based on the embodiments in this application without inventive effort should fall within the scope of protection of this application.

[0059] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0060] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0061] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery top cover, characterized in that, Top cover plate (10), the top cover plate (10) has a liquid injection hole (11), the liquid injection hole (11) includes a first expansion section (111) and a reduction section (112) connected axially in sequence; A sealing element (20) is inserted into a reduced diameter section (112). The sealing element (20) includes a first large diameter section (21), a small diameter section (22), and a second large diameter section (23) connected axially in sequence. A stepped structure is formed between the first large diameter section (21) and the small diameter section (22), and between the small diameter section (22) and the second large diameter section (23). The stepped structure abuts against the end face of the reduced diameter section (112). A shielding member (30) is provided to cover the opening of the injection hole (11) and to block and abut against the sealing member (20). The shielding member (30) is connected to the inner wall of the injection hole (11).

2. The battery top cover according to claim 1, characterized in that, The first large diameter section (21) is closer to the shield (30) than the second large diameter section (23). The end face of the second large diameter section (23) away from the first large diameter section (21) has a bevel structure (231), and the bevel structure (231) is inclined away from the central axis of the seal (20) along the direction close to the first large diameter section (21).

3. The battery top cover according to claim 2, characterized in that, There are multiple inclined structures (231), and each inclined structure (231) is arranged at intervals along the circumference of the seal (20).

4. The battery top cover according to claim 2, characterized in that, The included angle A formed between the inclined structure (231) and the axis of the injection hole (11) is greater than or equal to 20° and less than or equal to 45°; and / or The inclined structure (231) is continuously arranged along the circumference of the seal (20) and is conical.

5. The battery top cover according to claim 1, characterized in that, A positioning structure is provided between the sealing element (20) and the blocking element (30). When the blocking element (30) blocks the sealing element (20), the blocking element (30) is positioned and docked with the sealing element (20) through the positioning structure.

6. The battery top cover according to claim 5, characterized in that, The positioning structure includes a positioning protrusion (33) and a positioning recess (24). One of the sealing member (20) and the shielding member (30) is provided with the positioning protrusion (33), and the other of the sealing member (20) and the shielding member (30) is provided with the positioning recess (24). When the shielding member (30) shields the sealing member (20), the positioning protrusion (33) is located in the positioning recess (24).

7. The battery top cover according to claim 1, characterized in that, The shielding member (30) includes a first segment (31) and a second segment (32) connected axially in sequence. The diameter of the first segment (31) is larger than the diameter of the second segment (32). The injection hole (11) also includes a second expansion segment (113). The second expansion segment (113) is located at the end of the first expansion segment (111) away from the reduction segment (112). The shielding member (30) covers the second expansion segment (113). The step surface between the first segment (31) and the second segment (32) and the step surface between the second expansion segment (113) and the first expansion segment (111) abut against each other.

8. The battery top cover according to any one of claims 1 to 7, characterized in that, Along the axial direction of the injection hole (11), the thickness of the top cover plate (10) is L, the length of the seal (20) is L1, and 1 / 3L≤L1≤3 / 4L, the length of the small diameter section (22) as claimed in PN279745HZYWDL is 40%-60%L, the length of the first large diameter section (21) is 5%-20%L1, and the length of the second large diameter section (23) is 5%-20%L1.

9. The battery top cover according to any one of claims 1 to 7, characterized in that, The diameter of the reduced diameter section (112) is D, the diameter of the first large diameter section (21) is D1, and the diameter of the small diameter section (22) is D2, wherein D < D2 ≤ D + 0.5 mm, and D2 + 0.5 mm < D1 < D2 + 2 mm.

10. The battery top cover according to any one of claims 1 to 6, characterized in that, The shielding member (30) includes a first segment (31) and a second segment (32) connected sequentially in the axial direction. The diameter of the first segment (31) is larger than the diameter of the second segment (32). The circumferential side of the first segment (31) is welded to the inner wall of the injection hole (11). Along the axial direction of the injection hole (11), the thickness of the top cover plate (10) is L, the diameter of the reduced diameter section (112) is D, the length of the first segment (31) is h, and the diameter of the first segment (31) is φ, where 3 / 2D < φ < 3D, 1 / 4L ≤ h ≤ 1 / 2L.

11. A battery, characterized in that, It includes a housing and a battery top cover according to any one of claims 1 to 10, the battery top cover sealing the opening of the housing.

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