Top cover and battery

Abstract

The utility model relates to the technical field of batteries, and discloses a top cover and a battery. The top cover comprises a top cover sheet with a mounting hole; the pole is in a step shape and is provided with a first step surface; the upper insulating part sleeves the upper part of the pole and is mounted at the mounting hole; the connecting piece is arranged at the lower part of the pole in a sleeving manner, a first gap is formed between the connecting piece and the first step surface, and a second gap communicated with the first gap is formed between the connecting piece and the top cover piece; the sealing ring is located in the first gap and the second gap, the connecting piece and the first step face extrude the sealing ring to form static sealing, and the connecting piece and the top cover piece extrude the sealing ring to form dynamic sealing. The first gap and the second gap are sealed at the pole through the sealing ring, the number of the sealing rings is small, the number of parts of the top cover is small, the cost is saved, the sealing performance is improved through combination of dynamic sealing and static sealing, the sealing performance of the battery top cover is further effectively improved, and therefore the overall quality and safety of the battery are guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a top cover and a battery. Background Art

[0002] With the development and popularization of new energy vehicles, as one of the core components of hybrid electric vehicles and pure electric vehicles, the development and research of secondary batteries have also attracted much attention, and the safety performance of secondary batteries has increasingly become an important indicator for people to evaluate the performance of secondary batteries.

[0003] A secondary battery usually includes a battery housing and a cell structure, etc. The cell structure is arranged inside the battery housing. The battery housing includes a housing and a top cover. The top cover is installed on the top of the housing. It is an important part of the battery encapsulation. The design and structure of the battery top cover are crucial for ensuring the safety and reliability of the battery.

[0004] The existing top cover includes a top cover sheet, pole posts, upper plastics, connecting sheets, lower plastics, a first sealing ring and a second sealing ring. The first sealing ring is arranged between the upper plastics and the top cover sheet, and the second sealing ring is arranged between the connecting sheet and the top cover sheet. The area where each pole post is located realizes sealing through two sealing rings. The large number of sealing rings leads to a large number of parts and high costs. Summary of the Utility Model

[0005] In view of this, the utility model provides a top cover and a battery to solve the problem of a large number of parts and high costs caused by using two sealing rings to seal at each pole post.

[0006] In a first aspect, the utility model provides a top cover, including: a top cover sheet having a mounting hole; a pole post in a stepped shape and having a first step surface; an upper insulating part sleeved on the upper part of the pole post and installed at the mounting hole; a connecting sheet sleeved on the lower part of the pole post. A first gap is formed between the connecting sheet and the first step surface, and a second gap communicating with the first gap is formed between the connecting sheet and the top cover sheet; a sealing ring located in the first gap and the second gap. The connecting sheet and the first step surface squeeze the sealing ring to form a static seal, and the connecting sheet and the top cover sheet squeeze the sealing ring to form a dynamic seal.

[0007] Beneficial effects: The first gap and the second gap are sealed by one sealing ring at the pole post. The number of sealing rings is small, the number of parts of the top cover is small, and the cost is saved. Moreover, the connecting sheet and the first step surface squeeze the sealing ring to form a static seal, and the connecting sheet and the top cover sheet squeeze the sealing ring to form a dynamic seal. The sealing performance is improved by combining the dynamic seal and the static seal, thereby effectively improving the sealing performance of the battery top cover, and thus ensuring the overall quality and safety of the battery. Due to the existence of the first gap, the manufacturing precision of each part can be reduced, it is easier to manufacture, thereby reducing costs, improving production efficiency and reducing material waste.

[0008] In an alternative embodiment, the thickness of the sealing ring corresponding to the first step surface is greater than the minimum height of the first gap, and the thickness of the sealing ring corresponding to the top cover sheet is greater than the maximum height of the second gap.

[0009] Beneficial effects: The sealing ring is an elastomer and can be compressed. The thickness of the sealing ring corresponding to the first step surface is greater than the first gap. The part of the sealing ring corresponding to the first step surface is squeezed by the connecting piece and the pole column, which can block the liquid leakage path formed between the connecting piece and the pole column. The thickness of the sealing ring corresponding to the top cover sheet is greater than the second gap. The part of the sealing ring corresponding to the top cover sheet is also compressed, which can block the liquid leakage path formed between the connecting piece and the sealing ring and the liquid leakage path formed between the top cover sheet and the sealing ring, ensuring that the electrolyte will not leak from the top cover, thereby avoiding situations such as battery short - circuit caused by electrolyte leakage.

[0010] In an alternative embodiment, the upper surface of the connecting piece has an upward - protruding upper convex ring. The lower surface of the sealing ring contacts the upper surface of the connecting piece. An inner lower ring groove is provided on the inner side of the lower surface of the sealing ring. A first gap is formed between the upper convex ring and the first step surface, and the upper convex ring is located in the lower ring groove.

[0011] Beneficial effects: By squeezing the sealing ring with the upper convex ring, it can ensure that the sealing ring is evenly compressed, forming a good sealing surface, preventing electrolyte leakage, and improving the sealing performance. The design of squeezing the sealing ring with the upper convex ring is relatively simple and easy to implement. During assembly, only need to press - fit the connecting piece or the pole column in place to complete the installation, and the assembly process is more convenient. The simple assembly method also improves production efficiency; the design of squeezing the sealing ring with the upper convex ring can withstand a certain degree of pressure change and is not easily affected by mechanical vibration, and can maintain good sealing performance even in a harsh environment. Squeezing the sealing ring with the upper convex ring usually does not require additional maintenance, and this sealing method reduces maintenance costs and downtime.

[0012] In an alternative embodiment, the top cover further includes a lower insulating part. The lower insulating part is arranged on the lower surface of the top cover sheet. The top cover sheet has a thinning area. The lower insulating part has an insertion part inserted between the lower surface of the top cover sheet and the upper surface of the connecting piece. The first gap is greater than or equal to the sum of the thickness errors of the part of the upper insulating part corresponding to the thinning area, the thickness error of the thinning area, and the thickness error of the insertion part.

[0013] Beneficial effects: By the first gap being greater than or equal to the sum of the manufacturing errors of the top cover sheet, the upper insulating part, and the lower insulating part, not only can the sealing performance of the sealing ring be ensured, but also the manufacturing precision of each part can be reduced, making it easier to manufacture, thereby reducing costs, improving production efficiency, and reducing material waste. The insertion part is located between the connecting piece and the top cover sheet, which can fix the lower insulating part, and the fixing method is simple.

[0014] In an alternative embodiment, a downwardly protruding lower convex ring is provided on the bottom surface of the top cover sheet, and an upper ring groove is provided on the upper surface of the sealing ring. The upper ring groove is spaced from the inner hole surface and the outer peripheral surface of the sealing ring, and the lower convex ring presses against the bottom wall of the upper ring groove.

[0015] Advantages: By pressing the sealing ring with the lower convex ring, it can ensure that the sealing ring is evenly compressed, forming a good sealing surface, preventing electrolyte leakage, improving the sealing performance. The design of pressing the sealing ring with the lower convex ring is relatively simple and easy to implement. During assembly, only need to install the connecting piece in place to complete the installation, and the assembly process is more convenient. The simple assembly method also improves production efficiency; the design of pressing the sealing ring with the lower convex ring can withstand a certain degree of pressure change and is not easily affected by mechanical vibration, and can maintain good sealing performance even in a harsh environment.

[0016] In an alternative embodiment, the lower surface of the top cover sheet is lower than the first step surface.

[0017] Advantages: It can not only increase the contact area between the connecting piece and the pole column, make the fixation between the connecting piece and the pole column more firm and reliable, improve mechanical stability, but also increase the contact area between the top cover sheet and the sealing ring, which helps to improve the tightness of the seal and reduce the possibility of leakage.

[0018] In an alternative embodiment, the upper surface of the sealing ring inside the upper ring groove is the inner upper surface, and the upper surface of the sealing ring outside the upper ring groove is the outer upper surface, and the outer upper surface is set lower than the inner upper surface.

[0019] Advantages: The outer upper surface being set lower than the inner upper surface can be adapted to the lower surface of the top cover sheet being lower than the first step surface, and can also save the amount of sealing material used, reduce weight and cost.

[0020] In an alternative embodiment, the lower side of the outer peripheral surface of the sealing ring has an outwardly protruding outer flange.

[0021] Advantages: The outer flange contacts the connecting piece, increasing the contact area between the sealing ring and the connecting piece, thereby improving the sealing effect, making the pressure or stress distribution more uniform, and providing better support and stability. Especially in application scenarios with vibration or movement, it can maintain a good sealing state.

[0022] In an alternative embodiment, the upper insulating member has a radial ring, an axial ring, and a radial convex ring arranged in sequence from top to bottom. The radial ring surrounds the pole column. The pole column also has a second step surface and a transition surface located between the first step surface and the second step surface. The second step surface is above the first step surface. The axial ring is located between the step surface of the mounting hole and the second step surface, and the radial convex ring is located between the lower hole section of the mounting hole and the transition surface.

[0023] Beneficial effects: The upper insulating part, as an insulating material, can completely isolate the pole column and the top cover sheet through the radial ring, the axial ring and the radial convex ring, preventing short circuit between the pole column and the top cover sheet and ensuring electrical isolation between the pole column and the top sheet. The radial convex ring also contacts the inner upper surface of the sealing ring, and the sealing ring can also be extruded through the radial convex ring, resulting in better sealing effect.

[0024] In a second aspect, the present utility model also provides a battery, comprising: the above-mentioned top cover. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0026] Figure 1 A perspective view of a top cover according to an embodiment of the present utility model;

[0027] Figure 2 is Figure 1 a top view of the shown top cover;

[0028] Figure 3 is Figure 1 a sectional view taken along the line A-A of the shown top cover;

[0029] Figure 4 is Figure 3 a partially enlarged schematic view of the left side of the shown top cover;

[0030] Figure 5 is Figure 3 a partially enlarged schematic view of the right side of the shown top cover;

[0031] Figure 6 is Figure 1 an exploded view of the positive pole column, the upper insulating part and the sealing ring in the first perspective;

[0032] Figure 7 is Figure 1 an exploded view of the positive pole column, the upper insulating part and the sealing ring in the second perspective;

[0033] Figure 8 is Figure 1 an exploded view of the top cover sheet, the lower insulating part and the connecting piece in the first perspective;

[0034] Figure 9 is Figure 1 an exploded view of the top cover sheet, the lower insulating part and the connecting piece in the second perspective.

[0035] Description of the reference numerals:

[0036] 1. Top cover sheet; 101. Mounting hole; 102. Thinning area; 103. Lower convex ring;

[0037] 2. Terminal post; 201. First stepped surface; 202. Second stepped surface; 203. Positive terminal post; 204. Negative terminal post;

[0038] 3. Upper insulating member; 301. Radial ring; 302. Axial ring; 303. Radial convex ring;

[0039] 4. Connecting piece; 401. Upper convex ring;

[0040] 5. Sealing ring; 501. Lower annular groove; 502. Upper annular groove; 503. Outer flange;

[0041] 6. Lower insulating member; 601. Insertion portion. Detailed implementation manners

[0042] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Apparently, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0043] The following combines Figures 1 to 9 , and describes the embodiments of the present utility model.

[0044] According to an embodiment of the present utility model, on the one hand, a top cover is provided, including: a top cover sheet 1, a terminal post 2, an upper insulating member 3, and a connecting piece 4. The top cover sheet 1 has a mounting hole 101; the terminal post 2 is stepped and has a first stepped surface 201; the upper insulating member 3 is sleeved on the upper part of the terminal post 2 and is installed at the mounting hole 101; the connecting piece 4 is sleeved on the lower part of the terminal post 2. A first gap is formed between the connecting piece 4 and the first stepped surface 201, and a second gap communicating with the first gap is formed between the connecting piece 4 and the top cover sheet 1; a sealing ring 5 is located in the first gap and the second gap. The connecting piece 4 presses the sealing ring 5 against the first stepped surface 201 to form a static seal, and the connecting piece 4 presses the sealing ring 5 against the top cover sheet 1 to form a dynamic seal.

[0045] Applying the top cover of this embodiment, a sealing ring 5 seals the first gap and the second gap at the pole post 2. The number of sealing rings 5 is small, and the number of parts of the top cover is small, saving costs. Moreover, the connecting piece 4 presses the sealing ring 5 against the first step surface 201 to form a static seal, and the connecting piece 4 presses the sealing ring 5 against the top cover piece 1 to form a dynamic seal. By combining the dynamic seal and the static seal, the sealing performance is improved, thereby effectively improving the sealing performance of the battery top cover, and thus ensuring the overall quality and safety of the battery. Due to the existence of the first gap, the manufacturing precision of each part can be reduced, making it easier to manufacture, thereby reducing costs, improving production efficiency, and reducing material waste.

[0046] It should be noted that the dynamic seal means that during the operation of the battery, the compression amount of the sealing ring 5 will change, and the static seal means that during the operation of the battery, the compression amount of the sealing ring 5 does not change.

[0047] In one embodiment, as Figure 3 and Figure 4 shown, the thickness of the sealing ring 5 corresponding to the first step surface 201 is greater than the minimum height h of the first gap, and the thickness of the sealing ring 5 corresponding to the top cover piece 1 is greater than the maximum height of the second gap. The sealing ring 5 is an elastomer and can be compressed. The thickness of the sealing ring 5 corresponding to the first step surface 201 is greater than the first gap. The part of the sealing ring 5 corresponding to the first step surface 201 is pressed by the connecting piece 4 and the pole post 2, which can block the liquid leakage path formed between the connecting piece 4 and the pole post 2. The thickness of the sealing ring 5 corresponding to the top cover piece 1 is greater than the second gap, and the part of the sealing ring 5 corresponding to the top cover piece 1 is also compressed, which can block the liquid leakage paths formed between the connecting piece 4 and the sealing ring 5 and between the top cover piece 1 and the sealing ring 5, ensuring that the electrolyte will not leak from the top cover, and thus avoiding situations such as battery short circuits caused by electrolyte leakage.

[0048] In one embodiment, as Figure 6 and Figure 9As shown, the upper surface of the connecting piece 4 has an upwardly convex upper convex ring 401. The lower surface of the sealing ring 5 contacts the upper surface of the connecting piece 4. The inner side of the lower surface of the sealing ring 5 is provided with a lower ring groove 501. A first gap is formed between the upper convex ring 401 and the first step surface 201, and the upper convex ring 401 is located in the lower ring groove 501. By squeezing the sealing ring 5 with the upper convex ring 401, it can ensure that the sealing ring 5 is evenly compressed, forming a good sealing surface, preventing electrolyte leakage, improving the sealing performance. The design of squeezing the sealing ring 5 with the upper convex ring 401 is relatively simple and easy to implement. During assembly, only need to press the connecting piece 4 or the pole column 2 in place to complete the installation, and the assembly process is more convenient. The simple assembly method also improves the production efficiency; the design of squeezing the sealing ring 5 with the upper convex ring 401 can withstand a certain degree of pressure change and is not easily affected by mechanical vibration, and can maintain good sealing performance even in a harsh environment. Squeezing the sealing ring 5 with the upper convex ring 401 usually does not require additional maintenance, and this sealing method reduces the maintenance cost and downtime.

[0049] In one embodiment, as Figure 4 、 Figure 5 and Figure 9 shown, the top cover further includes a lower insulating member 6. The lower insulating member 6 is disposed on the lower surface of the top cover sheet 1. The top cover sheet 1 has a thinning area 102. The lower insulating member 6 has an insertion portion 601 inserted between the lower surface of the top cover sheet 1 and the upper surface of the connecting piece 4. The first gap is greater than or equal to the thickness error of the corresponding thinning area 102 of the upper insulating member 3 △ t1, the thickness error of the thinning area 102 △ t2, and the thickness error of the insertion portion 601 △ t3. By the first gap being greater than or equal to the sum of the manufacturing errors of the top cover sheet 1, the upper insulating member 3, and the lower insulating member 6, not only can the sealing performance of the sealing ring 5 be ensured, but also the manufacturing precision of each part can be reduced, making it easier to manufacture, thereby reducing costs, improving production efficiency, and reducing material waste. The insertion portion 601 is located between the connecting piece 4 and the top cover sheet 1, and can fix the lower insulating member 6, and the fixing method is simple.

[0050] It should be noted that the lower insulating member 6 is located below the top cover sheet 1 and is used to isolate the top cover from the charged components such as the pole ears and the core package inside the battery to prevent short circuits; it is used to provide an insulating barrier to ensure electrical isolation between the internal components of the battery; it can support the internal components of the battery, such as the pole ears, to keep their positions stable and avoid displacement during transportation or use.

[0051] In one embodiment, as Figure 7 and Figure 8As shown in the figure, a downwardly protruding lower convex ring 103 is provided on the bottom surface of the top cover sheet 1, and an upper ring groove 502 is provided on the upper surface of the sealing ring 5. The upper ring groove 502 is spaced from the inner hole surface and the outer peripheral surface of the sealing ring 5, and the lower convex ring 103 presses against the bottom wall of the upper ring groove 502. By pressing the sealing ring 5 with the lower convex ring 103, it can be ensured that the sealing ring 5 is uniformly compressed, forming a good sealing surface, preventing electrolyte leakage, improving the sealing performance. The design of pressing the sealing ring 5 with the lower convex ring 103 is relatively simple and easy to implement. During assembly, only the connecting piece 4 needs to be installed in place to complete the installation, and the assembly process is more convenient. The simple assembly method also improves production efficiency; the design of pressing the sealing ring 5 with the lower convex ring 103 can withstand a certain degree of pressure change and is not easily affected by mechanical vibration, and can maintain good sealing performance even in a harsh environment.

[0052] It should be noted that the distance between the lower convex ring 103 and the upper surface of the connecting piece 4 is h1, and h1 is greater than the distance between the bottom wall of the upper ring groove 502 and the lower surface of the seal.

[0053] In one embodiment, as Figure 6 shown, the lower surface of the top cover sheet 1 is lower than the first step surface 201, which can not only increase the contact area between the connecting piece 4 and the pole 2, make the fixation between the connecting piece 4 and the pole 2 more firm and reliable, improve mechanical stability, but also increase the contact area between the top cover sheet 1 and the sealing ring 5, which helps to improve the sealing tightness and reduce the possibility of leakage.

[0054] In one embodiment, as Figure 7 shown, the upper surface of the sealing ring 5 located inside the upper ring groove 502 is the inner upper surface, and the upper surface of the sealing ring 5 located outside the upper ring groove 502 is the outer upper surface, and the outer upper surface is set lower than the inner upper surface. Setting the outer upper surface lower than the inner upper surface can be adapted to the lower surface of the top cover sheet 1 being lower than the first step surface 201, and can also save the amount of sealing material used, reduce weight and cost.

[0055] It can be understood that in another embodiment, the outer upper surface and the inner upper surface are coplanar.

[0056] In one embodiment, as Figure 7 shown, the lower side of the outer peripheral surface of the sealing ring 5 has an outwardly protruding outer flange 503. The outer flange 503 contacts the connecting piece 4, increasing the contact area between the sealing ring 5 and the connecting piece 4, thereby improving the sealing effect, making the pressure or stress distribution more uniform, and providing better support and stability. Especially in an application scenario with vibration or movement, it can maintain a good sealing state.

[0057] It can be understood that in another embodiment, the outer flange 503 may not be provided.

[0058] In one embodiment, as Figure 6 and Figure 7 shown, the upper insulating member 3 has a radial ring 301, an axial ring 302, and a radial convex ring 303 arranged in sequence from top to bottom. The radial ring 301 surrounds the pole column 2. The pole column 2 further has a second step surface 202 and a transition surface located between the first step surface 201 and the second step surface 202. The second step surface 202 is located above the first step surface 201. The axial ring 302 is located between the step surface of the mounting hole 101 and the second step surface 202. The radial convex ring 303 is located between the lower hole section of the mounting hole 101 and the transition surface. As an insulating material, the upper insulating member 3 can completely isolate the pole column 2 and the top cover sheet 1 through the radial ring 301, the axial ring 302, and the radial convex ring 303, prevent a short circuit between the pole column 2 and the top cover sheet 1, and ensure the electrical isolation between the pole column 2 and the top sheet. The radial convex ring 303 also contacts the inner upper surface of the sealing ring 5, and the sealing ring 5 can also be extruded through the radial convex ring 303, resulting in a better sealing effect.

[0059] Furthermore, as Figure 4 and Figure 6 shown, the distance between the second step surface 202 and the upper surface of the connecting piece 4 is T. Due to the existence of the first gap, it can be ensured that T is the sum of the thickness t1 of the part of the upper insulating member 3 corresponding to the thinning area 102, the thickness t2 of the thinning area 102, and the thickness t3 of the insertion portion 601. Even if the manufacturing precision of each part of the top cover is relatively low, a good sealing effect of the dynamic seal can be achieved, and both the dynamic seal and the static seal play a sealing role, blocking the liquid leakage paths formed between the connecting piece 4 and the sealing ring 5 and between the top cover sheet 1 and the sealing ring 5.

[0060] It should be noted that the maximum height of the second gap is equal to t3.

[0061] Furthermore, as Figures 1 to 3 shown, there are usually two pole columns 2 on the top cover, which are respectively a positive pole column 203 and a negative pole column 204. At this time, there are two upper insulating members 3, two connecting pieces 4, and two sealing rings 5. The position where the positive pole column 203 is located is sealed by a sealing ring 5, and the position where the negative pole column 204 is located is sealed by a sealing ring 5. The top cover is provided with a total of two sealing rings 5. Compared with the four sealing rings in the prior art, the number of sealing rings 5 is reduced, and thus the number of parts of the top cover is reduced, resulting in low cost.

[0062] Specifically, the materials of both the upper insulating member 3 and the lower insulating member 6 are plastics, which have the advantages of electrical insulation, light weight, corrosion resistance, high structural strength, easy processing, strong plasticity, and good thermal stability.

[0063] According to an embodiment of the present invention, on the other hand, a battery is further provided, including: the above-mentioned top cover.

[0064] In one embodiment, the battery further includes a housing, and a top cover seals the opening of the housing. The top cover and the housing form a battery casing, and a battery cell, an electrolyte, etc. are disposed inside the battery casing.

[0065] Although embodiments of the present utility model have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present utility model, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A top cover, characterized in that: include: A top cover sheet (1) having a mounting hole (101); A pole (2) in a step-like shape and having a first step surface (201); An upper insulating member (3) is sleeved on the upper part of the pole (2) and installed at the installation hole (101); A connecting piece (4) is sleeved on the lower part of the pole (2), a first gap is formed between the connecting piece (4) and the first step surface (201), and a second gap connected to the first gap is formed between the connecting piece (4) and the top cover piece (1); A sealing ring (5) is located in the first gap and the second gap, the connecting piece (4) and the first step surface (201) squeeze the sealing ring (5) to form a static seal, and the connecting piece (4) and the top cover piece (1) squeeze the sealing ring (5) to form a dynamic seal.

2. The top cover according to claim 1, characterized in that: The thickness of the sealing ring (5) at the location corresponding to the first step surface (201) is greater than the minimum height of the first gap, and the thickness of the sealing ring (5) at the location corresponding to the top cover sheet (1) is greater than the maximum height of the second gap.

3. The top cover according to claim 2, characterized in that: The upper surface of the connecting plate (4) has an upper convex ring (401) protruding upward, the lower surface of the sealing ring (5) contacts the upper surface of the connecting plate (4), the inner side of the lower surface of the sealing ring (5) is provided with a lower ring groove (501), the first gap is formed between the upper convex ring (401) and the first step surface (201), and the upper convex ring (401) is located in the lower ring groove (501).

4. The top cover according to claim 3, characterized in that: The top cover also includes a lower insulating member (6), the lower insulating member (6) is arranged on the lower surface of the top cover sheet (1), the top cover sheet (1) has a thinning area (102), the lower insulating member (6) has an insertion portion (601) inserted between the lower surface of the top cover sheet (1) and the upper surface of the connecting sheet (4), and the first gap is greater than or equal to the sum of the thickness error of the portion of the upper insulating member (3) corresponding to the thinning area (102), the thickness error of the thinning area (102), and the thickness error of the insertion portion (601).

5. The top cover according to any one of claims 1 to 4, characterized in that: The bottom surface of the top cover sheet (1) is provided with a lower convex ring (103) protruding downwards, and the upper surface of the sealing ring (5) is provided with an upper ring groove (502). The upper ring groove (502) is spaced apart from the inner hole surface and the outer peripheral surface of the sealing ring (5), and the lower convex ring (103) squeezes the bottom wall of the upper ring groove (502).

6. The top cover according to claim 5, characterized in that: The lower surface of the top cover sheet (1) is lower than the first step surface (201).

7. The top cover according to claim 6, characterized in that: The upper surface of the sealing ring (5) located inside the upper ring groove (502) is the inner upper surface, and the upper surface of the sealing ring (5) located outside the upper ring groove (502) is the outer upper surface, and the outer upper surface is arranged lower than the inner upper surface.

8. The top cover according to any one of claims 1 to 4, characterized in that: The lower side of the outer peripheral surface of the sealing ring (5) has an outer flange (503) protruding outward.

9. The top cover according to any one of claims 1 to 4, characterized in that: The upper insulating member (3) comprises a radial ring (301), an axial ring (302) and a radial convex ring (303) which are arranged in sequence from top to bottom, the radial ring (301) surrounds the pole (2), the pole (2) further comprises a second step surface (202) and a transition surface between the first step surface (201) and the second step surface (202), the second step surface (202) being located above the first step surface (201), the axial ring (302) being located between the step surface of the mounting hole (101) and the second step surface (202), and the radial convex ring (303) being located between the lower hole section of the mounting hole (101) and the transition surface.

10. A battery, characterized in that: include: The top cover according to any one of claims 1 to 9.

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