CN220984669U - Battery top cover structure and battery - Google Patents

Abstract

The application relates to the technical field of new energy batteries, in particular to a battery top cover structure and a battery. When the sealing ring is used, when the pole is installed, the lower plastic is forced to press down gradually to compress the sealing ring, the sealing ring gradually spreads and expands towards the pole through hole in the process of being extruded, so that the sealing ring gradually fills up a gap between the pole through hole and the pole, and during the period, the pole through hole with a cross section of oblique line or arc line gradually contacts with the sealing ring which is gradually expanded, so that the sealing ring is uniformly stressed in the filling process, burrs, cracks, chips and the like are prevented from being generated on the contact surface of the sealing ring and the pole through hole, and further sealing failure caused by the fact that the sealing ring is split is avoided, and electrolyte in a battery is prevented from leaking.

Description

Battery top cover structure and battery

Technical Field

The application relates to the technical field of new energy batteries, in particular to a battery top cover structure and a battery.

Background

Under the large background of global energy conservation, emission reduction and sustainable development, new energy is expected to replace fossil energy, and the new energy technology is widely applied to the fields of automobiles, heavy trucks, agricultural unmanned aerial vehicles, electric tools and the like.

The power battery has the characteristics of high energy density, long cycle life, no memory effect, environmental friendliness and the like, and is widely applied to plug-in hybrid electric vehicles, hybrid electric vehicles and pure electric vehicles. The energy storage battery is mainly used for solar power generation equipment and wind power generation equipment and can store renewable energy.

However, in the process of producing and working the power battery and the energy storage battery, in the process of installing the pole column of the current battery top cover, the lower plastic is forced to downwards compress the sealing ring, burrs, cracks, scraps and the like are easy to occur in the compressed process of the sealing ring, and the sealing ring can be broken to cause sealing failure, so that the problem is a technical problem to be solved in the field.

Disclosure of utility model

In view of this, the application provides a battery top cover structure and a battery, which can avoid burrs, cracks, scraps and the like of a sealing ring when the sealing ring is pressed down by lower plastic, and avoid sealing failure caused by the fact that the sealing ring is split.

In a first aspect, the present application provides a battery top cover structure, including: the lower plastic comprises a pole through hole, wherein the pole through hole is used for being sleeved on the pole, and the section shape of the inner edge of the pole through hole is at least partially oblique line or arc line; and the sealing ring is sleeved on the pole, and at least part of the sealing ring is positioned between the pole through hole and the pole.

When the sealing ring is used, when the pole is installed, the lower plastic is forced to press down gradually to compress the sealing ring, the sealing ring gradually spreads and expands towards the pole through hole in the extruded process, so that the sealing ring gradually fills the gap between the pole through hole and the pole, during the process, the pole through hole with the cross section of oblique line or arc line gradually contacts with the sealing ring which is gradually expanded, the sealing ring is uniformly stressed in the filled process, burrs, cracks, chips and the like are avoided on the contact surface of the sealing ring and the pole through hole, and sealing failure caused by cutting of the sealing ring is avoided, so that electrolyte leakage in a battery is prevented.

With reference to the first aspect, in one possible implementation manner, a cross-sectional shape of an inner edge of the post through hole includes at least two discontinuous oblique lines or at least two arc lines.

With reference to the first aspect, in one possible implementation manner, the battery top cover structure further includes: the pole comprises a column body, a first protruding part and a second protruding part, wherein the first protruding part is arranged at the top end of the column body, the second protruding part is arranged on the peripheral surface of the bottom of the column body, and the pole through hole is sleeved on the column body; a top cover sheet disposed on a top surface of the lower plastic, the top cover sheet including a mounting hole through which the column portion passes; the sealing ring is at least partially positioned between the second protruding part and the bottom surface of the top cover sheet; and the upper plastic is partially and sequentially stretched into a first gap and a second gap, the first gap is a gap between the first protruding part and the top cover sheet, and the second gap is a gap between the mounting hole and the column part.

With reference to the first aspect, in one possible implementation manner, the lower plastic includes a third protruding portion disposed around the through hole of the pole, the third protruding portion protruding from a top surface of the lower plastic, and the third protruding portion is configured to form a recessed area on a bottom surface of the lower plastic, and an edge profile of the recessed area matches an edge profile of the second protruding portion.

With reference to the first aspect, in one possible implementation manner, a thickness of the sealing ring is greater than or equal to a thickness of the third protrusion.

With reference to the first aspect, in a possible implementation manner, the top cover sheet includes a recess disposed around the mounting hole, the recess is recessed in a bottom surface of the top cover sheet, and an edge contour of the recess matches an edge contour of the third protrusion.

With reference to the first aspect, in one possible implementation manner, a sum of the first dimension and the second dimension is less than or equal to a sum of a third dimension and a fourth dimension, where the first dimension is a depth D1 of the concave portion, the second dimension is a body thickness D2 of the lower plastic, the third dimension is a thickness D3 of the third protruding portion, and the fourth dimension is a thickness D4 of the second protruding portion.

With reference to the first aspect, in one possible implementation manner, the first size is greater than or equal to the third size.

With reference to the first aspect, in a possible implementation manner, the third dimension is greater than or equal to 0.1mm.

With reference to the first aspect, in a possible implementation manner, the second dimension is greater than or equal to 0.1mm.

With reference to the first aspect, in one possible implementation manner, the device further includes a vent groove disposed at a top of the third protruding portion, and the vent groove communicates from the post through hole to an outer edge of the third protruding portion.

With reference to the first aspect, in one possible implementation manner, the device further includes a vent groove, the vent groove is disposed at the bottom of the third protruding portion, an auxiliary vent groove is disposed on a side wall of the recessed area, the vent groove is communicated from the post through hole to the auxiliary vent groove, and the auxiliary vent groove is communicated from the vent groove to the bottom surface of the lower plastic.

With reference to the first aspect, in one possible implementation manner, a ratio of a fifth dimension to a sixth dimension is greater than or equal to 0.01 and less than or equal to any one of 0.2 to 0.5, where the fifth dimension is a horizontal length of the vent groove, and the sixth dimension is a dimension of the third protrusion along the horizontal length direction of the vent groove.

With reference to the first aspect, in one possible implementation manner, a ratio of a seventh dimension to an eighth dimension is greater than or equal to 0.01 and less than or equal to any one of 0.2 to 0.4, the seventh dimension is a width of the vent groove, and the eighth dimension is a dimension of the third protrusion along a width direction of the vent groove.

With reference to the first aspect, in one possible implementation manner, the upper plastic includes a first ring body and a second ring body, the first ring body is connected to an outer peripheral surface of the second ring body, the first ring body stretches into the first gap, and the second ring body stretches into the second gap.

With reference to the first aspect, in one possible implementation manner, the upper plastic further includes: and the third ring body is arranged on the top surface of the first ring body, and surrounds the outer side of the first protruding part.

With reference to the first aspect, in a possible implementation manner, the top cover piece includes a positioning recess disposed around the mounting hole, the positioning recess is recessed in a top surface of the top cover piece, and the positioning recess is configured to limit an outer peripheral surface of the third ring body.

In a second aspect, the present application provides a battery comprising a battery top cover structure as described in any one of the preceding claims.

The second aspect includes the first aspect, and technical effects of the second aspect are not described herein.

Drawings

Fig. 1 is a schematic structural diagram of a battery top cover structure according to an embodiment of the application.

Fig. 2 is a schematic view of a portion of a top cover structure of a battery according to another embodiment of the present application.

Fig. 3 is a schematic structural view of a pole in a battery top cover structure according to another embodiment of the present application.

Fig. 4 is a schematic cross-sectional view of fig. 3.

Fig. 5 is a schematic view showing a part of a top cover structure of a battery according to another embodiment of the application.

Fig. 6 is a schematic view showing a part of a top cover structure of a battery according to another embodiment of the present application.

Detailed Description

The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

An exemplary battery top cover structure is as follows:

Fig. 1 is a schematic structural diagram of a battery top cover structure according to an embodiment of the application. Fig. 2 is a schematic view of a portion of a top cover structure of a battery according to another embodiment of the present application. Fig. 3 is a schematic structural view of a pole in a battery top cover structure according to another embodiment of the present application. Fig. 4 is a schematic cross-sectional view of fig. 3.

The present application provides a battery top cover structure, which in one embodiment, referring to fig. 1, 2, 3 and 4, comprises: lower plastic 6 and sealing ring 5. The lower plastic 6 includes a post through hole 60, the post through hole 60 is used for being sleeved on the post 2, and the cross section shape of the inner edge of the post through hole 60 is at least partially oblique line or arc line. The sealing ring 5 is sleeved on the pole 2, and the sealing ring 5 is at least partially positioned between the pole through hole 60 and the pole 2.

When the sealing ring 5 is installed, the lower plastic 6 is pressed downwards gradually to compress the sealing ring 5 when the pole 2 is installed, the sealing ring 5 gradually spreads and expands towards the pole through hole 60 in the process of being extruded, the gap between the pole through hole 60 and the pole 2 is gradually filled with the sealing ring 5, during the period, the pole through hole 60 with the cross section being oblique lines or arc lines gradually contacts with the sealing ring 5 which is gradually expanded, so that the stress of the sealing ring 5 is uniform in the filling process, burrs, cracks, chips and the like are prevented from being formed on the contact surface of the sealing ring 5 and the pole through hole 60, and sealing failure caused by the fact that the sealing ring is ruptured is further avoided, and electrolyte leakage in a battery is prevented.

In an embodiment, the cross-sectional shape of the inner edge of the post through hole 60 includes at least two discontinuous oblique lines or at least two arc lines, so as to further optimize the pressure on the sealing ring 5 when the lower plastic 6 is pressed down, so that the stress process of the sealing ring 5 when expanding is prolonged, and further avoid the damage of the sealing ring 5.

In one embodiment, referring to fig. 1, 2, 3 and 4, the battery top cover structure comprises a pole 2, a lower plastic 6, a sealing ring 5, a top cover 1 and an upper plastic 4.

The pole 2 includes a cylindrical portion 20, a first protruding portion 21 formed at the top end of the cylindrical portion 20 by a burring process, and a second protruding portion 22 provided on the circumferential surface of the bottom of the cylindrical portion 20, the second protruding portion 22 protruding on the circumferential surface of the cylindrical portion 20. Specifically, the cylindrical portion 20 is cylindrical, the shape of the second protruding portion 22 is not limited, the first protruding portion 21 is formed on the top of the cylindrical portion 20 by a flanging process, and the first protruding portion 21 may be a ring.

The lower plastic 6 includes a post through hole 60, the post 20 passes through the post through hole 60, the lower plastic 6 is configured to limit the second boss 22 below the post through hole 60, the cross-sectional shape of the inner edge of the post through hole 60 is a slant line or an arc line, and the caliber of the post through hole 60 gradually increases or gradually decreases along the direction of the first boss 21 toward the second boss 22.

The sealing ring 5 is sleeved on the column part 20, the diameter of the outer ring of the sealing ring 5 is larger than that of the pole through hole 60, and the sealing ring 5 is at least partially positioned between the second protruding part 22 and the bottom surface of the lower plastic 6.

The top cover sheet 1 is provided on the top surface of the lower plastic 6, and the top cover sheet 1 includes mounting holes 11, and the column portions 20 pass through the mounting holes 11.

The upper plastic 4 partially extends into a first gap between the first boss 21 and the top cover sheet 1 and a second gap between the mounting hole 11 and the column portion 20.

When the method is applied, the first protruding portion 21 is formed through a flanging process, the polar column 2 is limited and fixed from the lower side through the lower plastic 6, the polar column 2 is limited and fixed from the upper side through the top cover plate 1 and the upper plastic 4, and the polar column is not required to be fixed through welding, riveting and other processes, so that the yield of product production is improved, and the production process is simplified. The gap between the pole 2 and the lower plastic 6 is sealed by a sealing ring 5. Since the cross-sectional shape of the inner edge of the post through hole 60 is a slant line or an arc line, the caliber of the post through hole 60 gradually increases or gradually decreases from top to bottom, so that the creepage distance between the post 2 and the top cover plate 1 in the up-down direction can be increased, and the short circuit probability between the post 2 and the top cover plate 1 can be reduced. In addition, in the flanging process, the first protruding portion 21 is gradually turned outwards and presses down the plastic 4, the top cover sheet 1 and the sealing ring 5, the sealing ring 5 gradually spreads and expands towards the post through hole 60 in the process of being extruded, so that the sealing ring 5 gradually fills up the gap between the post through hole 60, the second protruding portion 22, the top cover sheet 1 and the second ring body 42, during the period, the post through hole 60 with the cross section being oblique lines or arcs gradually contacts with the gradually expanded sealing ring 5, so that the sealing ring 5 is uniformly stressed in the filling process, burrs, cracks, chips and the like are prevented from being formed on the contact surface of the sealing ring 5 and the post through hole 60, and sealing failure caused by cutting of the sealing ring is further avoided, and electrolyte leakage in a battery is prevented.

In one embodiment, as shown in fig. 1, the top cover sheet 1 and the lower plastic 6 are of a long plate type structure, and the battery top cover structure further comprises an explosion-proof valve 7 and an explosion-proof valve protection sheet 8, and a hole channel for installing the explosion-proof valve 7 and the explosion-proof valve protection sheet 8 is arranged in the middle of the top cover sheet 1.

Specifically, referring to fig. 1, when the battery top cover structure is assembled, the non-flanging pole 2 is first threaded into the pole through hole 60 from the lower side of the lower plastic 6, then the sealing ring 5 is sleeved on the column portion 20, then the mounting hole 11 of the top cover 1 is sleeved on the column portion 20 from the upper side, then the upper plastic 4 and the gasket 3 are sleeved in sequence from the upper side, finally the flanging process is performed, and the first protruding portion 21 is turned over by 90 degrees to press the gasket 3.

Fig. 5 is a schematic view showing a part of a top cover structure of a battery according to another embodiment of the application. In one embodiment, as shown in fig. 5, the lower plastic 6 includes a third protrusion 61 disposed around the post through hole 60, the third protrusion 61 protruding from the top surface of the lower plastic 6, the third protrusion 61 configured to form a recessed area 62 on the bottom surface of the lower plastic 6, and the edge profile of the recessed area 62 matches the edge profile of the second protrusion 22. The second protruding portion 22 can be limited from the periphery through the concave area 6262, so that the pole 2 and the lower plastic 5 are prevented from being displaced relatively.

In an embodiment, the thickness of the sealing ring 5 is greater than or equal to the thickness of the third protruding portion 61, so that the sealing ring 5 can be extruded and expanded when the first protruding portion 21 is pressed downwards during the flanging process, and thus tightness between the lower plastic 6 and the pole 2 is ensured.

In an embodiment, the top sheet 1 comprises a recess 12 arranged around the mounting hole 11, the recess 12 being recessed in the bottom surface of the top sheet 1, the edge profile of the recess 12 matching the edge profile of the third protrusion 61. The third protruding portion 61 is limited from the periphery through the concave portion 12, so that the relative displacement of the top cover sheet 1 and the lower plastic 6 is avoided.

In one embodiment, as shown in fig. 5, the sum of the first dimension and the second dimension is less than or equal to the sum of the third dimension and the fourth dimension, the first dimension is the depth D1 of the concave portion 12, the second dimension is the body thickness D2 of the lower plastic 6, the third dimension is the thickness D3 of the third convex portion 61, and the fourth dimension is the thickness D4 of the second convex portion 22. In this embodiment, it can be ensured that the pole 2 can protrude from the upper end surface of the lower plastic 6, so as to facilitate the bus bar welding.

In an embodiment, the first dimension is greater than or equal to the third dimension, i.e., D1 is greater than or equal to D3, which ensures the torque stopping capability of the pole.

In one embodiment, the third dimension is greater than or equal to 0.1mm, i.e., D3 is greater than or equal to 0.1, ensuring insulation between the pole 2 and the lower surface of the cap piece 1. When D3 is less than 0.1, the risk of short-circuiting between the pole 2 and the top cover sheet 1 increases.

In one embodiment, the second dimension is greater than or equal to 0.1mm, i.e. D2 is greater than or equal to 0.1, ensuring insulation of the lower surface of the top cover sheet 1 from the battery inner connecting sheet and winding core below the battery top cover. When D2<0.1mm, the risk of short-circuiting between the winding core and the top cover sheet 1 increases.

Fig. 6 is a schematic view showing a part of a top cover structure of a battery according to another embodiment of the present application. In one embodiment, as shown in fig. 6, the battery top cover structure further includes a vent groove 63, the vent groove 63 is provided at the top of the third boss 61, and the vent groove 63 communicates from the post through hole 60 to the outer edge of the third boss 61. In the application of the embodiment, the lower plastic 6 can be prevented from sealing by the vent groove 63, that is, the vent groove 63 causes the lower plastic 6 to fail to seal the space among the upper plastic 4, the column portion 20, the top cover plate 1, the second protruding portion 22 and the lower plastic 6, so that the sealing effect of the sealing ring 5 can be tested when the sealing ring 5 is installed, and whether the sealing ring 5 is neglected to be installed or whether the sealing performance of the sealing ring 5 meets the standard can be known.

In an embodiment, as shown in fig. 6, the battery top cover structure further includes a vent groove 63, the vent groove 63 is disposed at the bottom of the third protruding portion 61, an auxiliary vent groove 64 is disposed on the sidewall of the recessed area 62, the vent groove 63 is connected to the auxiliary vent groove 64 from the post through hole 60, and the auxiliary vent groove 64 is connected to the bottom surface of the lower plastic 6 from the vent groove 63. In the application of the embodiment, the lower plastic 6 can be prevented from sealing by the vent groove 63 and the auxiliary vent groove 64, that is, the vent groove 63 and the auxiliary vent groove 64 can prevent the lower plastic 6 from sealing the space among the upper plastic 4, the column portion 20, the top cover plate 1, the second protruding portion 22 and the lower plastic 6, so that the sealing effect of the sealing ring 5 can be tested when the sealing ring 5 is installed, and whether the sealing ring 5 is neglected to be installed or whether the sealing performance of the sealing ring 5 reaches the standard can be known.

In an embodiment, the ratio of the fifth dimension to the sixth dimension is greater than or equal to 0.01 and less than or equal to any one of 0.2 to 0.5, the fifth dimension being the horizontal length of the vent groove 63, the sixth dimension being the dimension of the third boss 61 along the horizontal length of the vent groove 63. The vent groove 63 is ensured to be of sufficient size, and when the sealing ring fails or is neglected to be assembled, the air tightness detection is not caused to pass due to the lower plastic sealing, so that false detection is not caused. When the ratio is less than 0.01, the vent groove is too short to penetrate the third boss 61; when the ratio is greater than 0.5, the vent grooves 63 are too long, which may damage the structural strength of the lower plastic 6.

In an embodiment, the ratio of the seventh dimension to the eighth dimension is greater than or equal to 0.01 and less than or equal to any one of 0.2 to 0.4, the seventh dimension being the width of the vent groove 63, the eighth dimension being the dimension of the third boss 61 in the width direction of the vent groove 63. When the ratio is less than 0.01, the vent grooves 63 are too narrow to effectively vent and thus break the sealing effect of the plastic 6. When the ratio is more than 0.4, the vent grooves 63 are too wide, which may result in insufficient strength and insufficient insulation of the lower plastic 6.

In an embodiment, referring to fig. 2, the upper plastic 4 includes a first ring 41 and a second ring 42, the first ring 41 is connected to the outer peripheral surface of the second ring 42, the first ring 41 extends into the first gap, and the second ring 42 extends into the second gap. The first ring 41 and the second ring 42 can fill the gap outside the pole 2 better.

In an embodiment, the upper plastic 4 further includes a third ring 43, the third ring 43 is disposed on the top surface of the first ring 41, the third ring 43 surrounds the outer side of the first protruding portion, and the third ring 43 can limit and fix the first protruding portion 21 from the periphery, so as to further avoid displacement between the upper plastic 4 and the pole 2.

In one embodiment, as shown in fig. 5 and 6, the top cover sheet includes a positioning recess 10 provided around the mounting hole 11, the positioning recess 10 being recessed in the top surface of the top cover sheet 1, the positioning recess 10 being configured to limit the outer peripheral surface of the third ring body 43. The positioning recess 10 can reduce the protruding height of the pole 2 upward while limiting the upper plastic 4, thereby reducing the overall height of the battery top cover structure. When the upper plastic 4 further includes the third ring 43, the positioning recess 10 is used for limiting the outer peripheral surface of the third ring 43.

The application also provides a battery, which comprises the battery top cover structure, wherein the battery top cover structure is arranged on an electric core of the battery.

The basic principles of the present application have been described above in connection with specific embodiments, but it should be noted that the advantages, benefits, effects, etc. mentioned in the present application are merely examples and not intended to be limiting, and these advantages, benefits, effects, etc. are not to be construed as necessarily possessed by the various embodiments of the application. Furthermore, the specific details disclosed herein are for purposes of illustration and understanding only, and are not intended to be limiting, as the application is not necessarily limited to practice with the above described specific details.

The block diagrams of the devices, apparatuses, devices, systems referred to in the present application are only illustrative examples and are not intended to require or imply that the connections, arrangements, configurations must be made in the manner shown in the block diagrams. As will be appreciated by one of skill in the art, the devices, apparatuses, devices, systems may be connected, arranged, configured in any manner. Words such as "including," "comprising," "having," and the like are words of openness and mean "including but not limited to," and are used interchangeably therewith. The terms "or" and "as used herein refer to and are used interchangeably with the term" and/or "unless the context clearly indicates otherwise. The term "such as" as used herein refers to, and is used interchangeably with, the phrase "such as, but not limited to.

It is also noted that in the apparatus, devices and methods of the present application, the components or steps may be disassembled and/or assembled. Such decomposition and/or recombination should be considered as equivalent aspects of the present application.

The previous description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present utility model. Various modifications to these aspects will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other aspects without departing from the scope of the utility model. Thus, the present utility model is not intended to be limited to the aspects shown herein but is to be accorded the widest scope consistent with the principles and novel features herein.

The foregoing description of the preferred embodiments of the application is not intended to be limiting, but rather is to be construed as including any modifications, equivalents, and alternatives falling within the spirit and principles of the application.

Claims (18)

1. A battery top cover structure, comprising:

The lower plastic (6) comprises a pole through hole (60), wherein the pole through hole (60) is used for being sleeved on the pole (2), and the section shape of the inner edge of the pole through hole (60) is at least partially oblique line or arc line; and

The sealing ring (5) is sleeved on the pole (2), and the sealing ring (5) is at least partially positioned between the pole through hole (60) and the pole (2).

2. The battery top cover structure according to claim 1, wherein,

The cross-sectional shape of the inner edge of the post through hole (60) comprises at least two discontinuous oblique lines or at least two arc lines.

3. The battery top cover structure according to claim 1, further comprising:

The pole (2) comprises a column body (20), a first protruding part (21) and a second protruding part (22), wherein the first protruding part (21) is arranged at the top end of the column body (20), the second protruding part (22) is arranged on the peripheral surface of the bottom of the column body (20), and the pole through hole (60) is sleeved on the column body (20);

A top cover sheet (1) disposed on a top surface of the lower plastic (6), the top cover sheet (1) including a mounting hole (11), the column portion (20) passing through the mounting hole (11);

the sealing ring (5) is at least partially positioned between the second protruding part (22) and the bottom surface of the top cover sheet (1); and

Go up plastic (4), partly stretch into in proper order in first space and the second space, first space be first bellying (21) with the space between top cap piece (1), the second space be mounting hole (11) with the space between cylinder portion (20).

4. A battery top cover structure according to claim 3, characterized in that the lower plastic (6) comprises a third protrusion (61) arranged around the post through hole (60), the third protrusion (61) protruding from the top surface of the lower plastic (6), the third protrusion (61) being configured to form a recessed area (62) on the bottom surface of the lower plastic (6), the edge profile of the recessed area (62) matching the edge profile of the second protrusion (22).

5. The battery top cover structure according to claim 4, wherein the thickness of the seal ring (5) is greater than or equal to the thickness of the third boss (61).

6. The battery top cover structure according to claim 4, wherein the top cover sheet (1) includes a recess (12) provided around the mounting hole (11), the recess (12) is recessed in a bottom surface of the top cover sheet (1), and an edge profile of the recess (12) matches an edge profile of the third protrusion (61).

7. The battery top cover structure according to claim 6, wherein a sum of a first dimension and a second dimension is less than or equal to a sum of a third dimension and a fourth dimension, the first dimension being a depth D1 of the concave portion (12), the second dimension being a body thickness D2 of the lower plastic (6), the third dimension being a thickness D3 of the third convex portion (61), and the fourth dimension being a thickness D4 of the second convex portion (22).

8. The battery top cover structure according to claim 7, wherein,

The first dimension is greater than or equal to the third dimension.

9. The battery top cover structure according to claim 7, wherein,

The third dimension is greater than or equal to 0.1mm.

10. The battery top cover structure according to claim 7, wherein,

The second dimension is greater than or equal to 0.1mm.

11. The battery top cover structure according to claim 4, further comprising a vent groove (63), the vent groove (63) being provided at a top of the third protruding portion (61), the vent groove (63) communicating from the post through hole (60) to an outer edge of the third protruding portion (61).

12. The battery top cover structure according to claim 4, further comprising a vent groove (63), wherein the vent groove (63) is provided at the bottom of the third protruding portion (61), an auxiliary vent groove (64) is provided on the side wall of the recessed area (62), the vent groove (63) is communicated from the post through hole (60) to the auxiliary vent groove (64), and the auxiliary vent groove (64) is communicated from the vent groove (63) to the bottom surface of the lower plastic (6).

13. The battery top cover structure according to claim 11 or 12, wherein a ratio of a fifth dimension, which is a horizontal length of the vent groove (63), to a sixth dimension, which is a dimension of the third protruding portion (61) in a horizontal length direction of the vent groove (63), is greater than or equal to 0.01 and less than or equal to any one of 0.2 to 0.5.

14. The battery top cover structure according to claim 11 or 12, wherein a ratio of a seventh dimension, which is a width of the vent groove (63), to an eighth dimension, which is a dimension of the third protruding portion (61) in a width direction of the vent groove (63), is greater than or equal to 0.01 and less than or equal to any one of 0.2 to 0.4.

15. A battery top cover structure according to claim 3, wherein the upper plastic (4) comprises a first ring body (41) and a second ring body (42), the first ring body (41) is connected to the outer peripheral surface of the second ring body (42), the first ring body (41) extends into the first gap, and the second ring body (42) extends into the second gap.

16. The battery top cover structure according to claim 15, wherein the upper plastic (4) further comprises:

And the third ring body (43) is arranged on the top surface of the first ring body (41), and the third ring body (43) surrounds the outer side of the first protruding part.

17. The battery top cover structure according to claim 16, wherein the top cover sheet includes a positioning recess (10) provided around the mounting hole (11), the positioning recess (10) being recessed in a top surface of the top cover sheet (1), the positioning recess (10) being configured to limit an outer peripheral surface of the third ring body (43).

18. A battery comprising the battery top cover structure of any one of claims 1 to 17.