Battery top cover structure and battery

Abstract

The invention relates to the technical field of energy storage equipment, in particular to a battery top cover structure and a battery, and the battery top cover structure comprises a cover plate, a riveting block and a pole. The cover plate is provided with a first through hole. A second through hole is formed in the riveting block, a step surface is annularly arranged on the inner wall of the second through hole, and the step surface deviates from the cover plate. The pole comprises a first part and a second part, the cross section of the first part is oval, the second part is located on the side, away from the riveting block, of the cover plate, the first part sequentially penetrates through the first through hole and the second through hole to be riveted to the step face, and the hanging table height h of the first part, the thickness H of the riveting block and the hanging table width w of the first part meet # imgabs 0 # and # imgabs 1 #. The battery comprises a shell and the battery top cover structure, and the battery top cover structure is connected to the opening of the shell in a sealing manner to form a shell of the battery. According to the battery top cover structure and the battery, the cost of the battery can be reduced, and the structural strength requirement can be met.

Description

Technical Field

[0001] The present invention relates to the technical field of energy storage equipment, and in particular to a battery top cover structure and a battery. Background Art

[0002] As lithium-ion battery technology becomes increasingly mature, lithium-ion batteries are widely used as power batteries in the field of electric vehicles. The top cover structure of lithium-ion batteries is an important component of lithium-ion batteries. It not only provides protection for lithium-ion batteries in terms of safety and reliability, but also takes into account the connection between the internal chemical system of lithium-ion batteries and external modules.

[0003] The cross-section of the poles in the existing battery top cover structure is mostly circular. For batteries with thin thickness and narrow cover width, the poles are limited by the width of the cover and cannot be enlarged. In order to meet its overcurrent fast charging needs, a multi-pole solution is often used on a single cover. However, increasing the number of poles also requires increasing the number of corresponding insulating and sealing components, increasing the processing steps and time, resulting in an increase in the overall cost of the battery.

[0004] For the top cover structure that adopts the pole riveting fixing form, the pole is tightly connected with the riveting block through riveting expansion material. If the height and width of the riveted hanging platform are insufficient, the performance requirements of the top cover structure in terms of thrust strength, torsional strength, etc. cannot be met. If the height and width of the riveted hanging platform are too large, the difficulty of riveting will be increased, and the cost will be increased. Summary of the invention

[0005] An object of the present invention is to provide a battery top cover structure that can reduce the cost of the battery and meet the structural strength requirements.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] A battery top cover structure is provided, comprising:

[0008] A cover plate, wherein the cover plate is provided with a first through hole;

[0009] A riveting block, wherein a second through hole is formed on the riveting block, and a step surface is formed on the inner wall of the second through hole, and the step surface is arranged away from the cover plate;

[0010] A pole, the pole comprising a first part and a second part, the cross section of the first part is an ellipse, the second part is located on the side of the cover plate away from the riveting block, the first part passes through the first through hole and the second through hole in sequence and is riveted to the step surface, and the hanging platform height h of the first part, the thickness H of the riveting block and the hanging platform width w of the first part satisfy: , .

[0011] Optionally, the first part has a rivet groove on its end surface away from the second part, and the width L of the edge of the rivet groove satisfies .

[0012] Optionally, the width of the edge of the riveting groove is consistent everywhere along the circumference of the riveting groove.

[0013] Optionally, a riveting groove is provided on the end surface of the first part away from the second part, the side wall of the riveting groove is inclined toward the opening of the riveting groove, and the angle between the side wall of the riveting groove and the axial direction of the pole is satisfy .

[0014] Optionally, along the circumference of the riveting groove, an angle between the side wall of the riveting groove at any position and the axial direction of the pole remains unchanged.

[0015] Optionally, the second through hole includes a riveted hole, the step surface is located at the end of the riveted hole close to the cover plate, the diameter of the riveted hole is consistent with the outer circle diameter of the step surface, and the outer wall surface of the riveted deformation zone of the first part abuts against the inner wall of the riveted hole.

[0016] Optionally, the height of the hanging platform of the first part is consistent everywhere along the circumference of the first part.

[0017] Optionally, the width of the hanging platform of the first portion is consistent everywhere along the circumference of the first portion.

[0018] Optionally, the major axis a and the minor axis b of the cross section of the first portion satisfy .

[0019] Another object of the present invention is to provide a battery that can reduce the cost of the battery and meet the structural strength requirements.

[0020] To achieve this object, the present invention adopts the following technical solutions:

[0021] A battery is provided, comprising a shell and the above-mentioned battery top cover structure, wherein the battery top cover structure is sealed and connected to the opening of the shell to form an outer shell of the battery.

[0022] Beneficial effects of the present invention:

[0023] The present invention provides a battery top cover structure, including a cover plate, a riveting block and a pole. The cover plate is provided with a first through hole. The riveting block is provided with a second through hole, and a step surface is provided on the inner wall of the second through hole, and the step surface is arranged away from the cover plate. The pole includes a first part and a second part, the cross section of the first part is elliptical, and the second part is located on the side of the cover plate away from the riveting block. The first part passes through the first through hole and the second through hole in sequence and is riveted to the step surface, and the height h of the hanging platform of the first part, the thickness H of the riveting block and the width w of the hanging platform of the first part satisfy: , . The pole with an elliptical cross section can be used for batteries with thinner thickness and narrower cover width, and compared with the pole with a circular cross section, the pole with an elliptical cross section can increase the flow area, and there is no need to set up multiple poles to increase the cost. The thickness of the riveting block generally does not change much. If the ratio of the height of the first hanging platform to the thickness of the riveting block is less than 1 / 3, the height of the hanging platform is too small, and the hanging platform part of the first part is prone to stress deformation. However, if the ratio of the height of the first hanging platform to the thickness of the riveting block is higher than 2 / 3, on the one hand, it will increase the difficulty of riveting, the required riveting pressure is large, there is a risk of deformation of the riveting block, the process cost will also increase, and there may be uneven material rise in the height direction of the hanging platform. A high ratio will also make the thickness of the force-bearing area of ​​the riveting block too small, which will also affect the structural strength here. If the width of the first hanging platform is less than 0.2mm, the hanging platform part of the first part is prone to stress deformation, and the structural strength is insufficient. If the width of the first hanging platform is higher than 0.5mm, it will also increase the difficulty of riveting and increase the process cost. Therefore, the ratio of the height of the first hanging platform to the thickness of the riveting block is in the range of 1 / 3-2 / 3, and the width of the first hanging platform is in the range of 0.2mm-0.5mm, which can reduce the process difficulty and cost while ensuring the structural strength.

[0024] The present invention also provides a battery, comprising a housing and the battery top cover structure, wherein the battery top cover structure is sealed and connected to the opening of the housing to form a battery shell. The battery can reduce the cost of the battery and meet the structural strength requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a structural schematic diagram of a battery top cover structure provided by an embodiment of the present invention from a first viewing angle;

[0026] Figure 2 is a structural schematic diagram of a battery top cover structure provided by an embodiment of the present invention from a second viewing angle;

[0027] Figure 3 yes Figure 2 Middle AA section view;

[0028] Figure 4 yes Figure 2 Middle BB section view;

[0029] Figure 5 is a schematic structural diagram of a pole provided by an embodiment of the present invention from a first viewing angle;

[0030] Figure 6 It is a schematic structural diagram of a pole from a second viewing angle provided by an embodiment of the present invention.

[0031] In the figure:

[0032] 1. Cover plate;

[0033] 2. Riveting block; 21. Step surface;

[0034] 3. Pole; 31. First part; 311. Riveting deformation area; 3111. Riveting groove; 32. Second part;

[0035] 4. Insulation upper plastic; 5. Sealing ring; 6. Insulation lower plastic. DETAILED DESCRIPTION

[0036] Before any embodiments of the application are explained in detail, it is to be understood that the application is not limited in its application to the details of construction and the arrangement of components set forth in the following description or illustrated in the above drawings.

[0037] In this application, the terms "comprises", "includes", "has" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device that includes a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of more restrictions, an element defined by the sentence "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device that includes the element.

[0038] In this application, the term "and / or" is a description of the association relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the related objects before and after are in an "and / or" relationship.

[0039] In the present application, the terms "connect", "combine", "couple", and "install" may refer to direct connection, combination, coupling, or installation, or indirect connection, combination, coupling, or installation. For example, direct connection refers to two parts or components being connected together without the need for an intermediate piece, and indirect connection refers to two parts or components being connected to at least one intermediate piece respectively, and the two parts or components being connected via the intermediate piece. In addition, "connect" and "couple" are not limited to physical or mechanical connections or couplings, and may include electrical connections or couplings.

[0040] In this application, it will be understood by those of ordinary skill in the art that relative terms (e.g., "about," "approximately," "substantially," etc.) used in conjunction with quantities or conditions include the values ​​and have the meaning indicated by the context. For example, the relative terms include at least the degree of error associated with the measurement of a specific value, the tolerances caused by manufacturing, assembly, and use associated with a specific value, etc. Such terms should also be considered to disclose a range defined by the absolute values ​​of the two endpoints. Relative terms may refer to plus or minus a certain percentage (e.g., 1%, 5%, 10% or more) of the indicated value. Numerical values ​​that do not use relative terms should also be disclosed as specific values ​​with tolerances. In addition, "substantially" may refer to plus or minus a certain degree (e.g., 1 degree, 5 degrees, 10 degrees or more) on the basis of the indicated angle when expressing a relative angular position relationship (e.g., substantially parallel, substantially perpendicular).

[0041] In this application, it will be understood by those skilled in the art that the function performed by a component can be performed by one component, multiple components, one part, or multiple parts. Similarly, the function performed by a part can also be performed by one part, one component, or a combination of multiple parts.

[0042] In the present application, the terms "upper", "lower", "left", "right", "front", "back" and other directional words are described based on the orientation and positional relationship shown in the accompanying drawings, and should not be understood as limiting the embodiments of the present application. In addition, in the context, it is also necessary to understand that when it is mentioned that an element is connected to another element "upper" or "lower", it can not only be directly connected to another element "upper" or "lower", but also indirectly connected to another element "upper" or "lower" through an intermediate element. It should also be understood that directional words such as upper side, lower side, left side, right side, front side, back side, etc. not only represent the positive orientation, but can also be understood as the lateral orientation. For example, the bottom can include directly below, lower left, lower right, lower front, and lower back, etc.

[0043] The cross-section of the poles in the existing battery top cover structure is mostly circular. For batteries with thin thickness and narrow cover width, the poles are limited by the width of the cover and cannot be enlarged. In order to meet its overcurrent fast charging needs, a multi-pole solution is often used on a single cover. However, increasing the number of poles also requires increasing the number of corresponding insulating and sealing components, increasing the processing steps and time, resulting in an increase in the overall cost of the battery.

[0044] For the top cover structure that adopts the pole riveting fixing form, the pole is tightly connected with the riveting block through riveting expansion material. If the height and width of the riveted hanging platform are insufficient, the performance requirements of the top cover structure in terms of thrust strength, torsional strength, etc. cannot be met. If the height and width of the riveted hanging platform are too large, the difficulty of riveting will be increased, and the cost will be increased.

[0045] In order to solve the above problems, the present embodiment provides a battery top cover structure, which can reduce the cost of the battery and meet the structural strength requirements.

[0046] Specifically, Figures 1 to 6 As shown, the battery top cover structure of this embodiment includes a cover plate 1, a riveting block 2 and a pole 3. Among them, the cover plate 1 is provided with a first through hole. The riveting block 2 is provided with a second through hole, and a step surface 21 is provided on the inner wall of the second through hole, and the step surface 21 is arranged away from the cover plate 1. The pole 3 includes a first part 31 and a second part 32, the cross section of the first part 31 is elliptical, and the second part 32 is located on the side of the cover plate 1 away from the riveting block 2. The first part 31 passes through the first through hole and the second through hole in sequence and is riveted to the step surface 21. The height h of the hanging platform of the first part 31, the thickness H of the riveting block 2 and the width w of the hanging platform of the first part 31 satisfy: , Optionally, the thickness H of the riveted block 2 is generally set to be greater than 2 mm, which can ensure the riveting strength of the riveted block 2. The upper limit of the thickness H of the riveted block 2 depends on factors such as the height of the pole 3. If it is too high, it will occupy too much space and affect the energy density.

[0047] The pole 3 with an elliptical cross section can be applied to batteries with a thinner thickness and a narrower cover plate 1. Compared with the pole with a circular cross section, the pole 3 with an elliptical cross section can increase the flow area, and it is not necessary to set multiple poles 3 to increase the cost. Optionally, the major axis a and the minor axis b of the cross section of the first portion 31 meet the following conditions: If the ratio of the major axis a to the minor axis b of the cross section of the first portion 31 exceeds 2.5, it is easy for the two ends of the major axis to be saturated, but the two ends of the minor axis to be unsaturated, which will inevitably increase the difficulty of the riveting operation and reduce the yield.

[0048] The thickness of the riveting block 2 generally does not change much. If the ratio of the height h of the first part 31 to the thickness H of the riveting block 2 is less than 1 / 3, the height of the hanging platform is too small, and the hanging platform part of the first part 31 is easily deformed by force. However, if the ratio of the height h of the first part 31 to the thickness H of the riveting block 2 is greater than 2 / 3, on the one hand, the difficulty of riveting will increase, the required riveting pressure will be large, there is a risk of deformation of the riveting block 2, the process cost will also increase, and there may be a problem of uneven material expansion in the height direction of the hanging platform. If this ratio is too large, the thickness of the force-bearing area of ​​the riveting block 2 will be too small, which will also affect the structural strength here. If the width w of the hanging platform of the first part 31 is less than 0.2mm, the hanging platform part of the first part 31 is easily deformed by force, and the structural strength is insufficient. If the width w of the hanging platform of the first part 31 is greater than 0.5mm, it will also increase the difficulty of riveting and increase the process cost. Therefore, the ratio of the height h of the first part 31 to the thickness H of the riveting block 2 is in the range of 1 / 3-2 / 3, and the width w of the first part 31 is in the range of 0.2mm-0.5mm, which can reduce the process difficulty and cost while ensuring the structural strength.

[0049] Optionally, the second through hole includes a rivet hole, the step surface 21 is located at the end of the rivet hole close to the cover plate 1, the diameter of the rivet hole is consistent with the outer diameter of the step surface 21, and the outer wall surface of the rivet deformation zone 311 of the first part 31 abuts against the inner wall of the rivet hole, so that the pole 3 and the riveted block 2 maintain good contact and ensure the current conduction performance between the two. The inner wall of the rivet hole can limit the riveting of the pole 3 to ensure that the width of the hanging platform after the pole 3 is riveted is within the design range, so that the width of the hanging platform is not too large and the height of the hanging platform is not insufficient, resulting in insufficient structural strength.

[0050] Optionally, the height of the hanging platform of the first part 31 is consistent at all locations along the circumference of the first part 31 . Optionally, the width of the hanging platform of the first part 31 is consistent at all locations along the circumference of the first part 31 , so as to ensure the consistency of the structural strength of the riveting deformation zone 311 .

[0051] Optionally, a rivet groove 3111 is provided on the end surface of the first portion 31 away from the second portion 32, and the width L of the edge of the rivet groove 3111 satisfies: The width L of the edge of the riveting groove 3111 is the thickness of the riveting lip. When the thickness of the riveting lip is less than 0.5 mm, the structural strength of the riveting lip is insufficient. When the thickness of the riveting lip is greater than 1 mm, insufficient material expansion is likely to occur, resulting in the inability of the pole 3 to fit tightly with the riveting block 2.

[0052] Optionally, the width of the edge of the riveting groove 3111 is consistent everywhere along the circumference of the riveting groove 3111 , that is, the thickness of the riveting lip is consistent everywhere along the circumference of the pole 3 to avoid uneven force.

[0053] Alternatively, if Figure 5As shown, the side wall of the riveting groove 3111 is inclined toward the opening of the riveting groove 3111, and the angle between the side wall of the riveting groove 3111 and the axial direction of the pole 3 is satisfy . Such as the angle If the angle is less than 30°, a greater riveting pressure is required, otherwise the material may not expand enough. If the angle is greater than 45°, the material may not be fully expanded, especially the lower part of the pole 3. It should be noted that the first part 31 of the pole 3 is an elliptical column, and the axial direction of the pole 3 refers to the direction perpendicular to the cross section and passing through the center of the cross section.

[0054] Optionally, along the circumference of the riveting groove 3111 , the angle between the side wall of any position of the riveting groove 3111 and the axial direction of the pole 3 remains unchanged, so as to ensure that the riveting pressure at all positions in the circumference is consistent and the material expansion effect is consistent.

[0055] In order to demonstrate that the above-mentioned riveting-related dimensional design can achieve the effect of full material expansion and strong structural strength, twelve embodiments are listed in Table 1 below, which lists the riveting material saturation degree and the maximum thrust that can be withstood by the battery top cover structure with different dimensional parameters.

[0056] The saturation degree of the material expansion is the result of cutting the battery top cover structure after the pole 3 is riveted and observing it under a magnifying glass. A specific tool is used to apply a thrust to the top of the pole 3 until the cover 1 is deformed and the seal between the pole 3 and the cover 1 fails. The thrust at this time is recorded as the ultimate thrust of the pole 3, which should be greater than 2000N in principle. Riveting angle is the angle between the side wall of the riveting groove 3111 and the extended surfaces of the two surfaces, that is, , riveting angle The better value range of .

[0057] Table 1

[0058]

[0059] In the twelve embodiments in Table 1 above, the thickness H of the riveting block 2 is in the range of 2 mm to 3.6 mm, and the riveting angle All of them are in the better value range, that is, The thickness of the riveting lip L is within the range of 0.5mm-1mm, the width W of the step surface 21 is within the range of 0.2mm-0.5mm, so as to match the designed hanging platform width w, and the hanging platform height h is in accordance with It can be seen that when the above conditions are met, the material expansion saturation degree is saturated, the pole 3 fits tightly against the riveting block 2, the conduction is smooth and stable, and the ultimate thrust of the pole 3 is greater than 2000N, which meets the requirements for the structural strength of the riveting deformation zone 311.

[0060] Fifteen comparative examples are listed in Table 2 below, which characterize the saturation degree of riveting material expansion and the structural strength when any of the above-mentioned riveting-related dimensions does not meet the more optimal range. Similarly, the saturation degree of material expansion is the result of cutting the battery top cover structure after the pole 3 is riveted and observing it under a magnifying glass. A specific tool is used to apply a thrust to the top of the pole 3 until the cover plate 1 is deformed and the seal between the pole 3 and the cover plate 1 fails. The thrust at this time is recorded as the limit thrust of the pole 3, which should be greater than 2000N in principle.

[0061] Table 2

[0062]

[0063] Among them, the riveting angles of comparative examples 01 to 03 are None The optimal range is that the riveting angle of Example 01 is less than 60°, and the material expansion after riveting is not saturated, which will affect the conduction of the current, and the limit thrust is also lower than 2000N, that is, the structural strength is insufficient. When the angle is greater than 90°, the riveting expansion is also unsaturated, and the ultimate thrust of the pole 3 is lower, that is, the structural strength is worse.

[0064] The riveting lip thickness L of Comparative Examples 04-06 does not meet the better range of 0.5mm-1mm, among which the riveting lip thickness L of Comparative Example 04 is lower than 0.5mm. At this time, most of the materials are riveted and deformed to the riveting hole, and the depth of the riveting groove 3111 is small, so the material expansion on the upper end face of the riveting deformation zone 311 is saturated, and the closer to the step surface 21, the less saturated the material expansion is. In addition, since the annular end face of the pole 3 is too narrow after riveting, the structural strength is insufficient. The riveting lip thickness L of Comparative Examples 05 and 06 are both higher than 1mm, and they cannot be fully riveted in place. The expansion of both is unsaturated, and the structural strength does not meet the requirements.

[0065] The width W of the step surface 21 of Comparative Examples 07-09 does not meet the better range of 0.2mm-0.5mm, wherein the width W of the step surface 21 of Comparative Example 07 is less than 0.2mm, and the required riveting depth is small at this time, that is, the depth of the riveting groove 3111 is small, so the material expansion of the upper end surface of the riveting deformation zone 311 is saturated, and the closer to the step surface 21, the less saturated the material expansion is, and since the width w of the hanging platform is limited by the width W of the step surface 21, the actual hanging platform width is small, so the structural strength of the riveting deformation zone 311 is insufficient. The width W of the step surface 21 of Comparative Examples 08 and 09 are both higher than 0.5mm, and the space for the material to hang on the platform is too large, and the material expansion of both is not saturated, and since the riveting deformation of the material is not limited, the shape of the riveting deformation zone 311 is irregular, so the structural strength does not meet the requirements.

[0066] The height h of the hanging platform of comparative examples 10 to 15 does not meet The preferred range is shown in Figure 1, wherein the ratio of the height h of the hanging platform to the thickness H of the riveted block 2 of Examples 10 to 12 is less than 1 / 3, and the ratio of the height h of the hanging platform to the thickness H of the riveted block 2 of Examples 13 and 15 is greater than 2 / 3. The swelling of the six comparison examples is saturated, but the structural strength does not meet the requirements. When the ratio of the height h of the hanging platform to the thickness H of the riveted block 2 is too small, the riveted deformation zone 311 of the first part 31 is easily deformed by force, the pole 3 moves relative to the riveted block 2, and the seal fails. When the ratio of the height h of the hanging platform to the thickness H of the riveted block 2 is too large, the thickness of the stress-bearing area of ​​the riveted block 2 is too thin, and it is also easy to be deformed by force. Similarly, the stressed pole 3 can move relative to the riveted block 2, and the seal fails. Therefore, both too small and too large a ratio are not conducive to the structural strength of the riveted stress-bearing area.

[0067] like Figure 3 and Figure 4 As shown, in order to ensure that the pole 3 and the riveted block 2 are insulated from the cover plate 1, the battery top cover structure optionally further includes an insulating upper plastic 4, a sealing ring 5 and an insulating lower plastic 6, wherein the insulating upper plastic 4 is sandwiched between the riveted block 2 and the cover plate 1, and the insulating upper plastic 4 has an edge, and the edge is surrounded by the side wall of the riveted block 2 to further ensure the insulation between the riveted block 2 and the cover plate 1. The sealing ring 5 is sleeved on the first part 31 of the pole 3, specifically, the sealing ring 5 is sandwiched between the pole 3 and the first through hole, and the annular surface of the sealing ring 5 is sandwiched between the inner side of the cover plate 1 facing the inside of the battery and the end face of the second part 32 facing away from the inside of the battery. The insulating lower plastic 6 is attached to the inner side of the cover plate 1 facing the inside of the battery, and the insulating lower plastic 6 is partially sandwiched between the second part 32 and the cover plate 1.

[0068] This embodiment also provides a battery, comprising a housing and the battery top cover structure, wherein the battery top cover structure is sealed and connected to the opening of the housing to form a battery shell. The battery can reduce the cost of the battery and meet the structural strength requirements.

[0069] 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, other different forms of changes or modifications can be made based on the above description. 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. The battery top cover structure is characterized by: include: A cover plate (1), wherein the cover plate (1) is provided with a first through hole; A riveting block (2), wherein a second through hole is formed on the riveting block (2), a step surface (21) is formed on the inner wall of the second through hole, and the step surface (21) is arranged away from the cover plate (1); A pole (3), the pole (3) comprising a first portion (31) and a second portion (32), the first portion (31) having an elliptical cross section, the second portion (32) being located on a side of the cover plate (1) away from the rivet block (2), the first portion (31) passing through the first through hole and the second through hole in sequence and being riveted to the step surface (21), the hanging platform height h of the first portion (31), the thickness H of the rivet block (2) and the hanging platform width w of the first portion (31) satisfying: , .

2. The battery top cover structure according to claim 1, characterized in that: The first part (31) has a rivet groove (3111) on an end surface away from the second part (32), and the width L of the edge of the rivet groove (3111) satisfies .

3. The battery top cover structure according to claim 2, characterized in that: The width of the edge of the riveting groove (3111) is consistent everywhere along the circumference of the riveting groove (3111).

4. The battery top cover structure according to claim 1, characterized in that: The first part (31) has a riveting groove (3111) on its end surface away from the second part (32), the side wall of the riveting groove (3111) being arranged inclined toward the opening of the riveting groove (3111), and the angle between the side wall of the riveting groove (3111) and the axial direction of the pole (3) being satisfy .

5. The battery top cover structure according to claim 4, characterized in that: Along the circumference of the riveting groove (3111), the angle between the side wall of any position of the riveting groove (3111) and the axial direction of the pole (3) remains unchanged.

6. The battery top cover structure according to any one of claims 1 to 5, characterized in that: The second through hole comprises a riveting hole, the step surface (21) is located at an end of the riveting hole close to the cover plate (1), the diameter of the riveting hole is consistent with the outer diameter of the step surface (21), and the outer wall surface of the riveting deformation zone (311) of the first part (31) abuts against the inner wall of the riveting hole.

7. The battery top cover structure according to any one of claims 1 to 5, characterized in that: The height of the hanging platform of the first part (31) is consistent at all locations along the circumference of the first part (31).

8. The battery top cover structure according to any one of claims 1 to 5, characterized in that: The width of the hanging platform of the first part (31) is consistent at all locations along the circumference of the first part (31).

9. The battery top cover structure according to any one of claims 1 to 5, characterized in that: The major axis a and the minor axis b of the cross section of the first portion (31) satisfy .

10. A battery, characterized in that It comprises a shell and a battery top cover structure as claimed in any one of claims 1 to 9, wherein the battery top cover structure is sealed and connected to the opening of the shell to form an outer shell of the battery.

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