Battery top cover structure and battery

Abstract

The present application relates to the technical field of new energy batteries, and in particular to a battery top cover structure and a battery. During use, when a pole (2) is mounted, lower plastic (6) is forced to be pressed to gradually compress a sealing ring (5), and the sealing ring (5) gradually spreads and expands towards a third through hole (60) in the pressed process, so that the sealing ring (5) gradually fills a gap between the third through hole (60) and the pole (2). During this period, the third through hole (60) having an oblique-line or arc cross section gradually comes into contact with the gradually expanding sealing ring (5), so that the sealing ring (5) is uniformly stressed in the filling process, avoiding forming burrs, generating cracks and debris and the like on the contact surface of the sealing ring (5) and the third through hole (60), further avoiding a sealing failure caused by the sealing ring (5) being cut off, thus preventing an electrolyte in a battery from leaking.

Description

Battery top cover structure and battery Technical Field

[0001] The present application relates to the field of new energy battery technology, and in particular to a battery top cover structure and a battery. Background Art

[0002] Against the backdrop of global energy conservation, emission reduction and sustainable development, the replacement of fossil energy with new energy has become a popular demand. Currently, new energy technologies have been widely used in automobiles, heavy trucks, agricultural drones, power tools and other fields.

[0003] Power batteries feature high energy density, long cycle life, no memory effect, and are environmentally friendly. They are widely used in plug-in hybrid electric vehicles, hybrid electric vehicles, and pure electric vehicles. Energy storage batteries are primarily used in solar and wind power generation equipment, as well as for storing energy from renewable energy sources.

[0004] However, during the production and operation of power batteries and energy storage batteries, during the installation of the current battery top cover's poles, the lower plastic is forced downward to compress the sealing ring. During the compression process, the sealing ring is prone to burrs, cracks, and debris, and may also rupture, resulting in sealing failure. How to solve this problem is a technical problem that needs to be solved in this field.

[0005] Summary of the Invention

[0006] In view of this, the present application provides a battery top cover structure and a battery, which can prevent the sealing ring from having burrs, cracks, debris, etc. when the lower plastic presses down the sealing ring, and also prevent the sealing ring from being cut and causing sealing failure.

[0007] In a first aspect, the present application provides a battery top cover structure, comprising: a lower plastic, comprising a third through hole, the third through hole being sleeved on the pole, the cross-sectional shape of the inner edge of the third through hole being at least partially an oblique line or an arc line; and a sealing ring being sleeved on the pole, the sealing ring being at least partially located between the third through hole and the pole.

[0008] When the present invention is in use, when installing the pole, the lower plastic is forced downward to gradually compress the sealing ring. During the squeezing process, the sealing ring gradually spreads and expands toward the third through hole, so that the sealing ring gradually fills the gap between the third through hole and the pole. During this period, the third through hole with a slanted or arc-shaped cross-section gradually contacts the gradually expanding sealing ring, so that the sealing ring is evenly stressed during the filling process, avoiding the formation of burrs, cracks, debris, etc. on the contact surface between the sealing ring and the third through hole, and further avoiding the sealing ring being cut and causing sealing failure, thereby preventing leakage of electrolyte in the battery.

[0009] In combination with the first aspect, in a possible implementation, the cross-sectional shape of the inner edge of the third through hole includes at least two discontinuous oblique lines or at least two arc lines.

[0010] In combination with the first aspect, in a possible implementation, the battery top cover structure further includes: a pole, including a column portion, a first protrusion and a second protrusion, the first protrusion being arranged at the top end of the column portion, the second protrusion being arranged on the circumferential surface of the bottom end of the column portion, and the third through hole being sleeved on the column portion; a top cover sheet being arranged on the top surface of the lower plastic, the top cover sheet including a first through hole, and the column portion passing through the first through hole; the sealing ring being at least partially located between the second protrusion and the bottom surface of the top cover sheet; and an upper plastic, including a first ring body and a second ring body connected to each other, the first ring body being located between the upper surface of the top cover sheet and the first protrusion, and the second ring body being at least partially located between the column portion and the hole wall of the first through hole.

[0011] In combination with the first aspect, in a possible implementation, the lower plastic includes a third raised portion arranged around the third through hole, the third raised portion protruding from the top surface of the lower plastic, and the third raised portion is configured to form a recessed area on the bottom surface of the lower plastic, and the edge profile of the recessed area matches the edge profile of the second raised portion.

[0012] In combination with the first aspect, in a possible implementation, the thickness of the sealing ring is greater than or equal to the thickness of the third protrusion.

[0013] In combination with the first aspect, in a possible implementation, the top cover sheet includes a recessed portion arranged around the first through hole, the recessed portion is recessed in the bottom surface of the top cover sheet, and the edge profile of the recessed portion matches the edge profile of the third protrusion.

[0014] In combination with the first aspect, in a possible implementation, 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 recessed portion, the second dimension is the body thickness D2 of the lower plastic, the third dimension is the thickness D3 of the third protrusion, and the fourth dimension is the thickness D4 of the second protrusion.

[0015] With reference to the first aspect, in a possible implementation manner, the first size is greater than or equal to the third size.

[0016] With reference to the first aspect, in a possible implementation, the third size is greater than or equal to 0.1 mm.

[0017] With reference to the first aspect, in a possible implementation, the second size is greater than or equal to 0.1 mm.

[0018] In combination with the first aspect, in a possible implementation, a ventilation groove is further included, where the ventilation groove is arranged on the top of the third protrusion, and the ventilation groove is connected from the third through hole to the outer edge of the third protrusion.

[0019] In combination with the first aspect, in a possible implementation, it further includes a ventilation groove, which is arranged at the bottom of the third protrusion, and an auxiliary ventilation groove is provided on the side wall of the recessed area, and the ventilation groove is connected from the third through hole to the auxiliary ventilation groove, and the auxiliary ventilation groove is connected from the ventilation groove to the bottom surface of the lower plastic.

[0020] In combination with the first aspect, in one possible implementation, 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 value between 0.2 and 0.5, the fifth dimension is the horizontal length of the ventilation groove, and the sixth dimension is the dimension of the third protrusion along the horizontal length direction of the ventilation groove.

[0021] In combination with the first aspect, in one possible implementation, 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 value between 0.2 and 0.4, the seventh dimension is the width of the ventilation groove, and the eighth dimension is the dimension of the third protrusion along the width direction of the ventilation groove.

[0022] In combination with the first aspect, in a possible implementation, the top cover sheet includes a positioning recess arranged around the first through hole, the positioning recess is recessed in the top surface of the top cover sheet, and the positioning recess is configured to limit the upper plastic.

[0023] In combination with the first aspect, in a possible implementation, the battery top cover structure further includes a gasket having a second through hole, the second through hole being sleeved on the column portion, and the gasket being arranged between the lower surface of the first protrusion and the upper surface of the first ring body.

[0024] In combination with the first aspect, in a possible implementation, the first corner, the second corner and the third corner are located within a preset angle range with the fourth corner as the endpoint, the first corner is the upper junction between the first ring body and the second ring body, the second corner is the corner of the top of the second through hole, the third corner is the upper junction between the first protrusion and the columnar portion, and the fourth corner is the corner of the top of the first through hole; the preset angle range is composed of a first ray and a second ray, and the first ray and the second ray are based on a preset coordinate system, and the preset coordinate system takes the fourth corner as the coordinate origin and the plumb plane as the X-Y plane, the expression of the first ray is y1=kx+b1, and the expression of the second ray is y2=kx+b2; wherein, 20≥k≥0, 5>b1>b2>-5.

[0025] In combination with the first aspect, in a possible implementation, a ratio of the aperture of the first through hole to the sum of dimensions is greater than 1, and the sum of dimensions is the sum of the diameter of the column portion and the wall thickness of the second ring body.

[0026] In combination with the first aspect, in a possible implementation, a ratio of an outer diameter of the gasket to a diameter of the first through hole is greater than or equal to 1 and less than or equal to 2.

[0027] In combination with the first aspect, in a possible implementation, the wall thickness of the second ring body is greater than or equal to 0.1 mm and less than or equal to 3 mm.

[0028] In combination with the first aspect, in a possible implementation manner, the pole further includes a fourth protrusion, and the fourth protrusion is provided on the top surface of the column portion.

[0029] In combination with the first aspect, in a possible implementation, an annular groove is provided between the fourth protrusion and the first protrusion.

[0030] In combination with the first aspect, in a possible implementation, the cross-sectional shape of the wall surface of the annular groove facing outward is an oblique line or an arc line.

[0031] In combination with the first aspect, in a possible implementation, the ratio of the depth of the annular groove to the thickness of the first protrusion is greater than or equal to 1 and less than or equal to any value from 3 to 5.

[0032] In combination with the first aspect, in a possible implementation, the fourth protrusion is in the shape of a cylinder, and the ratio of the width of the annular groove to the diameter of the fourth protrusion is greater than or equal to 0.01 and less than or equal to 0.5.

[0033] In combination with the first aspect, in a possible implementation, a groove width of the annular groove is greater than or equal to 0.5 mm and less than or equal to 8 mm.

[0034] In combination with the first aspect, in a possible implementation, a top surface of the fourth protrusion is higher than or parallel to an upper end surface of the first protrusion.

[0035] In combination with the first aspect, in one possible implementation, the ratio of the second distance to the first distance is greater than or equal to 1 and less than or equal to any value from 2 to 3, the first distance is the distance between the top surface of the fourth protrusion and the top surface of the top cover sheet, and the second distance is the distance between the top surface of the first protrusion and the top surface of the top cover sheet; the ratio of the third distance to the second distance is greater than or equal to 1 and less than or equal to any value from 3 to 5, and the third distance is the distance between the top surface of the upper plastic and the top surface of the top cover sheet.

[0036] In combination with the first aspect, in a possible implementation, the battery top cover structure further includes: a first auxiliary gasket, which is annular in shape, and the first auxiliary gasket is arranged at the bottom of the gasket, and the first auxiliary gasket is embedded between the column portion and the second ring body.

[0037] In combination with the first aspect, in a possible implementation, the upper plastic further includes: a third ring body, which is arranged on the top surface of the second ring body, and the third ring body surrounds the outer side of the first protrusion.

[0038] In combination with the first aspect, in a possible implementation, the battery top cover structure further includes: a second auxiliary gasket, which is annular in shape, and the second auxiliary gasket is arranged on the top of the gasket, and the second auxiliary gasket is embedded between the first protrusion and the third ring body.

[0039] In combination with the first aspect, in a possible implementation, the cross-sectional shape of the upper surface of the transition portion between the first ring body and the second ring body is an arc, and / or the bottom of the transition portion between the first ring body and the second ring body has a groove.

[0040] In combination with the first aspect, in a possible implementation, the gasket is made of a material including metal.

[0041] In combination with the first aspect, in a possible implementation, the gasket is made of one or more materials selected from bakelite, polyphenylene sulfide, and ceramics.

[0042] In combination with the first aspect, in a possible implementation, the elastic modulus of the gasket is greater than or equal to the elastic modulus of the first protrusion, and / or the hardness of the gasket is greater than or equal to the hardness of the first protrusion.

[0043] In combination with the first aspect, in a possible implementation, a ratio of the thickness of the gasket to the thickness of the first protrusion is greater than or equal to 0.05 and less than or equal to 2.

[0044] In combination with the first aspect, in a possible implementation manner, an outer diameter of the gasket is larger than a hole diameter of the first through hole.

[0045] In combination with the first aspect, in a possible implementation, the ratio of the inner hole diameter of the gasket to the diameter of the column portion is greater than or equal to 1 and less than or equal to 1.5.

[0046] In combination with the first aspect, in a possible implementation manner, the cross-sectional shape of the lower end surface of the second ring body is an arc.

[0047] In combination with the first aspect, in a possible implementation, the lower end surface of the second ring body and the upper end surface of the sealing ring are in contact with each other.

[0048] In combination with the first aspect, in a possible implementation, the thickness of the second ring body is greater than or equal to 0.3 mm.

[0049] In a second aspect, the present application provides a battery comprising the battery top cover structure described in any one of the aforementioned items.

[0050] The second aspect includes the first aspect, and the technical effects of the second aspect will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] FIG1 is a schematic structural diagram of a battery top cover structure provided in one embodiment of the present application.

[0052] FIG2 is a partial structural schematic diagram of a battery top cover structure provided in another embodiment of the present application.

[0053] FIG3 is a schematic structural diagram of a pole in a battery top cover structure provided in another embodiment of the present application.

[0054] FIG4 is a schematic cross-sectional view of the structure of FIG3 .

[0055] FIG5 is a partial structural schematic diagram of a battery top cover structure provided in another embodiment of the present application.

[0056] FIG6 is a partial structural diagram of a battery top cover structure provided in another embodiment of the present application.

[0057] FIG7 is a partial structural diagram of a battery top cover structure provided in another embodiment of the present application.

[0058] FIG8 is a partial structural schematic diagram of a battery top cover structure provided in another embodiment of the present application.

[0059] FIG9 is a schematic structural diagram of a gasket in a battery top cover structure provided in one embodiment of the present application.

[0060] FIG10 is a schematic structural diagram of a gasket in a battery top cover structure provided in another embodiment of the present application.

[0061] FIG11 is a partial structural schematic diagram of a battery top cover structure provided in another embodiment of the present application. DETAILED DESCRIPTION

[0062] The following will be combined with the accompanying drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of this application.

[0063] An exemplary battery top cover structure is as follows:

[0064] Figure 1 is a schematic diagram of the structure of a battery top cover structure provided by one embodiment of the present application. Figure 2 is a schematic diagram of a portion of the structure of a battery top cover structure provided by another embodiment of the present application. Figure 3 is a schematic diagram of the structure of a terminal in a battery top cover structure provided by another embodiment of the present application. Figure 4 is a schematic diagram of the cross-sectional structure of Figure 3.

[0065] The present application provides a battery top cover structure. In one embodiment, as shown in Figures 1, 2, 3, and 4, the battery top cover structure includes a lower plastic member 6 and a sealing ring 5. The lower plastic member 6 includes a third through hole 60, which is disposed over the terminal 2. The inner edge of the third through hole 60 has a cross-sectional shape that is at least partially an oblique line or an arc. The sealing ring 5 is disposed over the terminal 2, with at least a portion of the sealing ring 5 being located between the third through hole 60 and the terminal 2.

[0066] During application of this embodiment, when installing the terminal 2, the lower plastic 6 is forced downward to gradually compress the sealing ring 5. During the squeezing process, the sealing ring 5 gradually spreads and expands toward the third through hole 60, so that the sealing ring 5 gradually fills the gap between the third through hole 60 and the terminal 2. During this period, the third through hole 60 with a slanted or arc-shaped cross-section gradually contacts the gradually expanding sealing ring 5, so that the sealing ring 5 is evenly stressed during the filling process, avoiding the formation of burrs, cracks, debris, etc. on the contact surface between the sealing ring 5 and the third through hole 60, and further avoiding the sealing ring from being cut and causing sealing failure, thereby preventing leakage of electrolyte in the battery.

[0067] In one embodiment, the cross-sectional shape of the inner edge of the third through hole 60 includes at least two discontinuous oblique lines or at least two arc lines, thereby further optimizing the pressure exerted on the sealing ring 5 by the lower plastic 6 when pressing downward, thereby prolonging the force exerted on the sealing ring 5 during expansion and further preventing damage to the sealing ring 5.

[0068] In one embodiment, referring to FIG. 1 , FIG. 2 , FIG. 3 and FIG. 4 , the battery top cover structure includes a terminal 2 , a lower plastic 6 , a sealing ring 5 , a top cover sheet 1 and an upper plastic 4 .

[0069] The terminal 2 includes a body 20, a first raised portion 21, and a second raised portion 22. The first raised portion 21 is formed at the top of the body 20 through a flanging process, and the second raised portion 22 is provided on the circumferential surface of the bottom of the body 20. The second raised portion 22 protrudes from the circumferential surface of the body 20. Specifically, the body 20 is cylindrical, and the shape of the second raised portion 22 is not limited. The first raised portion 21 is formed at the top of the body 20 through a flanging process. The first raised portion 21 can be annular.

[0070] The lower plastic 6 includes a third through hole 60, through which the column portion 20 passes. The lower plastic 6 is configured to limit the second protrusion 22 below the third through hole 60, that is, the second protrusion 22 is limited and fixed by the third through hole 60. The cross-sectional shape of the inner edge of the third through hole 60 is an oblique line or an arc line, and the diameter of the third through hole 60 gradually increases or decreases along the direction from the first protrusion 21 to the second protrusion 22.

[0071] The sealing ring 5 is sleeved on the column portion 20 . The outer diameter of the sealing ring 5 is larger than the diameter of the third through hole 60 . The sealing ring 5 is at least partially located between the second protrusion 22 and the bottom surface of the lower plastic 6 .

[0072] The top cover piece 1 is disposed on the top surface of the lower plastic 6 . The top cover piece 1 includes a first through hole 11 , and the column portion 20 passes through the first through hole 11 .

[0073] The upper plastic 4 partially extends into the first gap and the second gap in sequence. The first gap is the gap between the first protrusion 21 and the top cover 1 , and the second gap is the gap between the first through hole 11 and the column portion 20 .

[0074] When this embodiment is used, a first raised portion 21 is formed by a flanging process, and then the pole 2 is fixed from below by the lower plastic 6. The pole 2 is fixed from above by the top cover sheet 1 and the upper plastic 4. There is no need to use welding, riveting or other processes to fix the pole, which improves the yield rate of product production and simplifies the production process. The gap between the pole 2 and the lower plastic 6 is sealed by the sealing ring 5. Because the cross-sectional shape of the inner edge of the third through hole 60 is an oblique line or an arc, the diameter of the third through hole 60 gradually increases or decreases from top to bottom, thereby increasing the creepage distance between the pole 2 and the top cover sheet 1 in the vertical direction, reducing the probability of short circuit between the pole 2 and the top cover sheet 1. In addition, during the flanging process, the first protrusion 21 gradually turns outward and presses down on the plastic 4, the top cover sheet 1 and the sealing ring 5. The sealing ring 5 gradually spreads and expands toward the third through hole 60 during the extrusion process, so that the sealing ring 5 gradually fills the gap between the third through hole 60, the second protrusion 22, the top cover sheet 1 and the second ring body 42. During this period, the third through hole 60 with a slant line or arc cross-section gradually contacts the gradually expanding sealing ring 5, so that the sealing ring 5 is evenly stressed during the filling process, avoiding the formation of burrs, cracks, debris, etc. on the contact surface of the sealing ring 5 and the third through hole 60, and further avoiding the sealing ring from being cut and causing sealing failure, thereby preventing leakage of electrolyte in the battery.

[0075] In one embodiment, as shown in FIG1 , the top cover sheet 1 and the lower plastic 6 are long plate structures. The battery top cover structure further includes an explosion-proof valve 7 and an explosion-proof valve protection sheet 8. A hole for installing the explosion-proof valve 7 and the explosion-proof valve protection sheet 8 is provided in the middle of the top cover sheet 1.

[0076] Specifically, referring to Figure 1, when assembling the battery top cover structure, first, the unflanged pole 2 is passed upward from the bottom of the lower plastic 6 into the third through hole 60, and then the sealing ring 5 is put on the column part 20. Then, the first through hole 11 of the top cover sheet 1 is put on the column part 20 from above, and then the upper plastic 4 and the gasket 3 are inserted from above in sequence. Finally, the flanging process is performed, and the first protrusion 21 is turned 90 degrees to press the gasket 3.

[0077] Figure 5 is a partial schematic diagram of a battery top cover structure provided by another embodiment of the present application. In one embodiment, as shown in Figure 5, the lower plastic 6 includes a third raised portion 61 disposed around the third through hole 60. The third raised portion 61 protrudes from the top surface of the lower plastic 6 and is configured to form a recessed area 62 on the bottom surface of the lower plastic 6. The edge profile of the recessed area 62 matches the edge profile of the second raised portion 22. The recessed area 62 can limit the second raised portion 22 from all sides, preventing relative displacement between the terminal 2 and the lower plastic 6.

[0078] In one embodiment, the thickness of the sealing ring 5 is greater than or equal to the thickness of the third protrusion 61 , ensuring that during the flanging process, the sealing ring 5 can be squeezed and expanded when the first protrusion 21 is pressed downward, thereby ensuring the sealing between the lower plastic 6 and the pole 2 .

[0079] In one embodiment, the top cover sheet 1 includes a recessed portion 12 surrounding the first through hole 11. The recessed portion 12 is recessed into the bottom surface of the top cover sheet 1, and the edge profile of the recessed portion 12 matches the edge profile of the third raised portion 61. The recessed portion 12 restricts the third raised portion 61 from all sides, preventing relative displacement between the top cover sheet 1 and the lower plastic 6.

[0080] In one embodiment, as shown in Figure 5 , the sum of the first and second dimensions is less than or equal to the sum of the third and fourth dimensions. The first dimension is the depth D1 of the recessed portion 12, the second dimension is the thickness D2 of the lower plastic portion 6, the third dimension is the thickness D3 of the third raised portion 61, and the fourth dimension is the thickness D4 of the second raised portion 22. This embodiment ensures that the pole 2 protrudes beyond the upper end surface of the lower plastic portion 6, facilitating busbar welding.

[0081] In one embodiment, the first dimension is greater than or equal to the third dimension, that is, D1 is greater than or equal to D3, which can ensure the anti-torsion capability of the pole.

[0082] In one embodiment, the third dimension is greater than or equal to 0.1 mm, that is, D3 is greater than or equal to 0.1 mm, to ensure insulation between the pole 2 and the lower surface of the top cover 1. When D3 is less than 0.1 mm, the risk of short circuit between the pole 2 and the top cover 1 increases.

[0083] In one embodiment, the second dimension, D2, is greater than or equal to 0.1 mm, ensuring insulation between the lower surface of the top cover sheet 1 and the internal battery connector and winding core beneath the battery top cover. If D2 is less than 0.1 mm, the risk of short circuits between the winding core and the top cover sheet 1 increases.

[0084] FIG5 is a partial structural diagram of a battery top cover structure provided by another embodiment of the present application. In one embodiment, as shown in FIG5 , the battery top cover structure further includes a vent groove 63, which is provided at the top of the third protrusion 61. The vent groove 63 is connected from the third through hole 60 to the outer edge of the third protrusion 61. When this embodiment is used, the vent groove 63 can prevent the lower plastic 6 from performing a sealing function, that is, the vent groove 63 causes the lower plastic 6 to be unable to seal the space between the upper plastic 4, the column 20, the top cover sheet 1, the second protrusion 22, and the lower plastic 6. Therefore, when the sealing ring 5 is installed, the sealing effect of the sealing ring 5 can be tested, so that it can be determined whether the sealing ring 5 is missing or whether the sealing performance of the sealing ring 5 meets the standard.

[0085] In one embodiment, as shown in FIG6 , the battery top cover structure further includes a vent groove 63 disposed at the bottom of the third raised portion 61. An auxiliary vent groove 64 is disposed on the sidewall of the recessed area 62. The vent groove 63 communicates from the third through hole 60 to the auxiliary vent groove 64, which in turn communicates from the vent groove 63 to the bottom surface of the lower plastic 6. In this embodiment, the vent groove 63 and the auxiliary vent groove 64 prevent the lower plastic 6 from performing a sealing function. Specifically, the vent groove 63 and the auxiliary vent groove 64 prevent the lower plastic 6 from sealing the space between the upper plastic 4, the column 20, the top cover sheet 1, the second raised portion 22, and the lower plastic 6. Therefore, when the sealing ring 5 is installed, the sealing effect of the sealing ring 5 can be tested, thereby determining whether the sealing ring 5 is missing or whether the sealing performance of the sealing ring 5 meets the requirements.

[0086] In one 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 value between 0.2 and 0.5. The fifth dimension represents the horizontal length of the vent groove 63, and the sixth dimension represents the horizontal length of the third protrusion 61 along the vent groove 63. This ensures that the vent groove 63 is sufficiently large so that, if the sealing ring fails or is missing, the lower plastic seal will not cause the airtightness test to pass, resulting in a false detection. If the ratio is less than 0.01, the vent groove is too short and cannot penetrate the third protrusion 61. If the ratio is greater than 0.5, the vent groove 63 is too long, which may damage the structural strength of the lower plastic 6.

[0087] In one 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 value between 0.2 and 0.4. The seventh dimension represents the width of the vent groove 63, and the eighth dimension represents the width of the third protrusion 61 along the vent groove 63. When this ratio is less than 0.01, the vent groove 63 is too narrow to effectively ventilate, thereby breaking the sealing function of the lower plastic 6. When this ratio is greater than 0.4, the vent groove 63 is too wide, resulting in insufficient strength and insulation performance of the lower plastic 6.

[0088] In one embodiment, referring to FIG2 , the upper plastic member 4 includes a first ring member 41 and a second ring member 42 . The first ring member 41 is connected to the outer circumference of the second ring member 42 . The first ring member 41 extends into the first gap, and the second ring member 42 extends into the second gap. The first ring member 41 and the second ring member 42 can better fill the gap outside the pole 2 .

[0089] In one embodiment, the upper plastic 4 further includes a third ring body 43, which is disposed on the top surface of the first ring body 41 and surrounds the outer side of the first protrusion. The third ring body 43 can limit and fix the first protrusion 21 from all sides, further preventing displacement between the upper plastic 4 and the pole 2.

[0090] In one embodiment, as shown in Figures 5 and 6 , the top cover sheet includes a positioning recess 10 disposed around the first through hole 11. This recess 10 is recessed into the top surface of the top cover sheet 1 and is configured to position the outer circumference of the third ring 43. While retaining the upper plastic 4, the recess 10 also reduces the upward protrusion of the terminal 2, thereby reducing the overall height of the battery top cover structure. When the upper plastic 4 also includes the third ring 43, the recess 10 serves to position the outer circumference of the third ring 43.

[0091] Currently, battery top covers primarily use welding or riveting to secure the terminals to the top cover. However, these processes suffer from low product yields, prone to seal failure, and are complex and costly. Therefore, developing a battery top cover structure that eliminates the need for welding or riveting remains a pressing technical challenge in this field.

[0092] In view of this, the present application provides a second battery top cover structure and battery, which does not require welding, riveting and other processes to fix the poles, thereby improving the yield of product production and simplifying the production process.

[0093] An exemplary battery top cover structure is as follows:

[0094] FIG1 is a schematic diagram of the structure of a battery top cover structure provided in one embodiment of the present application. FIG7 is a schematic diagram of a partial structure of a battery top cover structure provided in another embodiment of the present application. FIG3 is a schematic diagram of the structure of a pole in a battery top cover structure provided in another embodiment of the present application. FIG4 is a schematic diagram of the cross-sectional structure of FIG3. The present application provides a battery top cover structure, as shown in FIG1, FIG7, FIG3 and FIG4, the battery top cover structure includes a pole 2, a top cover sheet 1, an upper plastic 4 and a gasket 3.

[0095] The pole 2 includes a column portion 20 and a first protrusion 21, wherein the first protrusion 21 is provided at the top end of the column portion 20. The top cover sheet 1 includes a first through hole 11, through which the column portion 20 passes. The upper plastic 4 includes a first ring body 41 and a second ring body 42 connected to each other, wherein the first ring body 41 is located between the upper surface of the top cover sheet 1 and the first protrusion 21, and the second ring body 42 is at least partially located between the column portion 20 and the hole wall of the first through hole 11. The gasket 3 is provided with a second through hole, which is sleeved on the column portion 20, and the gasket 3 is arranged between the lower surface of the first protrusion 21 and the upper surface of the first ring body 41. Among them, the first corner, the second corner and the third corner are located within a preset angle range with the fourth corner as the endpoint, the first corner is the upper junction between the first ring body 41 and the second ring body 42, the second corner is the corner of the top of the second through hole, the third corner is the upper junction between the first protrusion 21 and the columnar portion 20, and the fourth corner is the corner of the top of the first through hole 11; the preset angle range is composed of a first ray and a second ray, and the first ray and the second ray are based on a preset coordinate system, and the preset coordinate system takes the fourth corner as the coordinate origin and the plumb plane as the XY plane. The expression of the first ray is y1=kx+b1, and the expression of the second ray is y2=kx+b2; wherein, 20≥k≥0, 5>b1>b2>-5.

[0096] When this embodiment is used, the first raised portion 21 is formed by a flanging process, and the pole 2 is fixed from above by the top cover sheet 1 and the upper plastic 4. There is no need to use welding, riveting or other processes to fix the pole, which improves the yield rate of product production and simplifies the production process. By inserting the gasket 3 between the first raised portion 21 and the upper plastic 4, the upper plastic 4 can be protected from the direct pressure of the first raised portion 21 during the flanging process. The preset angle range can limit the assembly size, adjust the assembly difficulty of the top cover sheet 1 and the upper plastic 4, and control the flanging yield rate of the first raised portion 21. When the first corner, the second corner and the third corner are located between the two rays y1=kx+b1 and y2=kx+b2, the assembly of the top cover sheet 1 and the upper plastic 4 is simpler and the flanging yield rate of the first raised portion 21 is high. When the first corner, the second corner and the third corner are outside the two rays y1=kx+b1 and y2=kx+b2, the assembly of the top cover sheet 1 and the upper plastic 4 will be difficult, and the flange yield of the first protrusion 21 will be reduced.

[0097] Preferably, the first set of preferred parameters of the first ray and the second ray are: k=0.1, b1=3, b2=-3; the second set of preferred parameters of the first ray and the second ray are: k=10, b1=4, b2=-4. Under these two sets of preferred parameters, the assembly of the top cover sheet 1 and the upper plastic 4 is easier and the flanging yield of the first protrusion 21 is high.

[0098] In one embodiment, referring to FIG. 1 , FIG. 7 , FIG. 3 and FIG. 4 , the battery top cover structure includes a terminal 2 , a lower plastic 6 , a sealing ring 5 , a top cover sheet 1 , an upper plastic 4 and a gasket 3 .

[0099] The terminal 2 includes a body 20, a first raised portion 21, and a second raised portion 22. The first raised portion 21 is formed at the top of the body 20 by a flanging process, and the second raised portion 22 is located at the bottom of the body 20. The second raised portion 22 protrudes from the circumference of the body 20. Specifically, the body 20 is cylindrical, and the shape of the second raised portion 22 is not limited. The first raised portion 21 is a structure formed at the top of the body 20 by a flanging process, and the first raised portion 21 can be annular.

[0100] The lower plastic 6 includes a third through hole 60, through which the column portion 20 passes. The lower plastic 6 is configured to limit the second protrusion 22 below the third through hole 60. The cross-sectional shape of the inner edge of the third through hole 60 is an oblique line or an arc line, and the diameter of the third through hole 60 gradually increases or decreases along the direction from the first protrusion 21 to the second protrusion 22.

[0101] The sealing ring 5 is sleeved on the column portion 20 . The outer diameter of the sealing ring 5 is larger than the diameter of the third through hole 60 . The sealing ring is located between the second protrusion 22 and the bottom surface of the lower plastic 6 .

[0102] The top cover piece 1 is disposed on the top surface of the lower plastic 6 . The top cover piece 1 includes a first through hole 11 , and the column portion 20 passes through the first through hole.

[0103] The upper plastic 4 includes a first ring body 41 and a second ring body 42. The first ring body 41 is connected to the outer circumference 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. The first gap is the gap between the first protrusion 21 and the top cover sheet 1, and the second gap is the gap between the first through hole 11 and the column portion 20.

[0104] The gasket 3 is annular in shape and is sleeved on the column portion 20 . The gasket 3 is disposed between the lower surface of the first protrusion 21 and the upper surface of the upper plastic.

[0105] Among them, the first corner, the second corner and the third corner are located within a preset angle range with the fourth corner as the end point. The first corner is the corner where the first ring body 41 and the second ring body 42 intersect, the second corner is the corner at the top of the hole of the gasket 3, the third corner is the corner where the first protrusion 21 and the columnar portion 20 intersect, and the fourth corner is the corner at the top of the first through hole 11.

[0106] When this embodiment is used, a first raised portion 21 is formed by a flanging process, and then the pole 2 is fixed from below by the lower plastic 6. The pole 2 is fixed from above by the top cover sheet 1 and the upper plastic 4. There is no need to use welding, riveting or other processes to fix the pole, which improves the yield rate of product production and simplifies the production process. The gap between the pole 2 and the lower plastic 6 is sealed by the sealing ring 5. Because the cross-sectional shape of the inner edge of the third through hole 60 is an oblique line or an arc, the diameter of the third through hole 60 gradually increases or decreases from top to bottom, thereby increasing the creepage distance between the pole 2 and the top cover sheet 1 in the vertical direction, reducing the probability of short circuit between the pole 2 and the top cover sheet 1. Furthermore, during the flanging process, the first raised portion 21 gradually unfolds outward and presses down on the gasket 3, the upper plastic 4, the top cover sheet 1, and the sealing ring 5. As the sealing ring 5 is squeezed, it gradually expands toward the third through-hole 60, allowing the sealing ring 5 to gradually fill the gap formed by the third through-hole 60, the second raised portion 22, the top cover sheet 1, and the second ring body 42. During this process, the third through-hole 60, which has an oblique or arc-shaped cross-section, gradually contacts the gradually expanding sealing ring 5, thereby evenly applying force to the sealing ring 5 during the filling process and preventing burrs, cracks, and debris from forming on the contact surface between the sealing ring 5 and the third through-hole 60. Furthermore, by interposing the gasket 3 between the first raised portion 21 and the upper plastic 4, the upper plastic 4 is protected from direct pressure from the first raised portion 21 during the flanging process. The preset angle range can limit the assembly dimensions, adjust the assembly difficulty of the top cover sheet 1 and the upper plastic 4, and control the flanging yield of the first raised portion 21.

[0107] In one embodiment, as shown in FIG1 , the top cover sheet 1 and the lower plastic 6 are long plate structures. The battery top cover structure further includes an explosion-proof valve 7 and an explosion-proof valve protection sheet 8. A hole for installing the explosion-proof valve 7 and the explosion-proof valve protection sheet 8 is provided in the middle of the top cover sheet 1.

[0108] Specifically, referring to Figure 1, when assembling the battery top cover structure, first, the unflanged pole 2 is passed upward from the bottom of the lower plastic 6 into the third through hole 60, and then the sealing ring 5 is put on the column part 20. Then, the first through hole 11 of the top cover sheet 1 is put on the column part 20 from above, and then the upper plastic 4 and the gasket 3 are inserted from above in sequence. Finally, the flanging process is performed, and the first protrusion 21 is turned 90 degrees to press the gasket 3.

[0109] In one embodiment, as shown in Figure 8 , the top cover sheet includes a positioning recess 10 disposed around the first through hole 11. This recess 10 is recessed into the top surface of the top cover sheet 1 and is configured to position the upper plastic 4. While retaining the upper plastic 4, the recess 10 also reduces the upward protrusion of the terminal 2, thereby reducing the overall height of the battery top cover structure. When the upper plastic 4 also includes a third ring 43, the recess 10 serves to position the outer circumference of the third ring 43.

[0110] Figure 8 is a partial schematic diagram of a battery top cover structure provided by another embodiment of the present application. In one embodiment, as shown in Figure 8, the lower plastic 6 includes a third raised portion 61 disposed around the third through hole 60. The third raised portion 61 protrudes from the top surface of the lower plastic 6 and is configured to form a recessed area 62 on the bottom surface of the lower plastic 6. The edge profile of the recessed area 62 matches the edge profile of the second raised portion 22. The recessed area 62 can limit the second raised portion 22 from all sides, preventing relative displacement between the terminal 2 and the lower plastic 5.

[0111] In one embodiment, the thickness of the sealing ring 5 is greater than or equal to the thickness of the third protrusion 61 , ensuring that during the flanging process, the sealing ring 5 can be squeezed and expanded when the first protrusion 21 is pressed downward, thereby ensuring the sealing between the lower plastic 6 and the pole 2 .

[0112] In one embodiment, the top cover sheet 1 includes a recessed portion 12 surrounding the first through hole 11. The recessed portion 12 is recessed into the bottom surface of the top cover sheet 1, and the edge profile of the recessed portion 12 matches the edge profile of the third raised portion 61. The recessed portion 12 restricts the third raised portion 61 from all sides, preventing relative displacement between the top cover sheet 1 and the lower plastic 6.

[0113] In one embodiment, referring to Figures 7 and 8 , the ratio of the inner diameter of the gasket 3 to the diameter L4 of the column portion 20 is greater than or equal to 1 and less than or equal to 1.5. This ensures that the gasket 3 can provide adequate support. If the ratio is less than 1, the gasket 3 cannot be assembled and fitted onto the column portion 20. If the ratio is greater than 1.5, the gap between the gasket 3 and the column portion 20 is too large to effectively withstand the folding pressure from the first protrusion 21, thereby failing to effectively protect the upper plastic 4.

[0114] In one embodiment, referring to FIG7 , the first protrusion 21 is annular in shape, and the ratio of the outer diameter L3 of the first protrusion 21 to the outer diameter of the gasket 3 is greater than or equal to 1 and less than or equal to 1.5. This prevents the gasket 3 from being too large. If this ratio is less than 1, the outer wall of the gasket 3 protrudes beyond the outer wall of the first protrusion, making assembly difficult. If L3 / M1 is greater than 1.5, the outer wall of the gasket 3 is significantly different from the outer wall of the first protrusion, making it easy for residual dirt to accumulate.

[0115] In one embodiment, referring to FIG8 , the ratio of the diameter of the first through hole 11 to the sum of the dimensions (the sum of the diameter L4 of the column portion 20 and the horizontal wall thickness D1 of the second ring body 42) is greater than 1. If this ratio is less than or equal to 1, assembly may become difficult or even impossible.

[0116] In one embodiment, the ratio of the outer diameter of the gasket 3 to the aperture of the first through hole 11 is greater than or equal to 1 and less than or equal to 2. When the ratio is less than 1, the gasket 3 is too small; when the ratio is greater than 2, the gasket 3 is too large, resulting in material waste.

[0117] In one embodiment, the wall thickness of the second ring body 42 is greater than or equal to 0.1 mm and less than or equal to 3 mm. A wall thickness less than 0.1 mm is too thin, resulting in insufficient structural strength and insulation performance of the upper plastic 4. A wall thickness greater than 3 mm is too thick, resulting in wasted material and increased costs.

[0118] 3 and 4 , the pole 2 further includes a fourth protrusion 23 disposed on the top surface of the body 20. The fourth protrusion 23 protruding from the top surface of the body 20 facilitates busbar welding.

[0119] In one embodiment, an annular groove 24 is provided between the fourth protrusion 23 and the first protrusion 21. The annular groove 24 is used as a fulcrum for the flanging device. The first protrusion 21 before flanging is initially a circular ring standing upright on the top surface of the cylindrical portion 20. The fulcrum of the flanging device is abutted against the annular groove 24, and then the first protrusion 21 in the initial state is pushed outward, so that the first protrusion 21 is gradually folded outward 90°, forming the state shown in Figures 2 to 5.

[0120] In one embodiment, as shown in FIG4 , the cross-sectional shape of the outer wall of the annular groove 24 is a slant line or an arc line, that is, during the folding process of the first protrusion 21 , the transition portion between the first protrusion 21 and the column portion 20 forms a slant line or an arc line.

[0121] Figure 9 is a schematic diagram of the structure of a gasket in a battery top cover structure provided by one embodiment of the present application. In one embodiment, as shown in Figure 9, the battery top cover structure further includes a first auxiliary gasket 30. The first auxiliary gasket 30 is annular in shape and is connected to the bottom of the gasket 3. The first auxiliary gasket 30 is embedded between the column portion 20 and the second ring body 42. The first auxiliary gasket 30 can protect the second ring body 42 of the upper plastic 4 and prevent the upper plastic 4 from cracking.

[0122] In one embodiment, as shown in FIG2 , the upper plastic 4 further includes a third ring 43 , which is disposed on the top surface of the second ring 42 and surrounds the outer side of the first protrusion 21 . The third ring 43 can limit and fix the first protrusion 21 from all sides, thereby further preventing displacement between the upper plastic 4 and the pole 2 .

[0123] Figure 10 is a schematic diagram of the structure of a gasket in a battery top cover structure according to another embodiment of the present application. In one embodiment, as shown in Figure 10, the battery top cover structure further includes a second auxiliary gasket 31. The second auxiliary gasket 31 is annular in shape and is disposed on top of the gasket 3. The second auxiliary gasket 31 is embedded between the first protrusion 21 and the third ring body 43. The second auxiliary gasket 31 can protect the third ring body 43 and prevent the upper plastic 4 from cracking.

[0124] Currently, battery top covers primarily use welding or riveting to secure the terminals to the top cover. However, these processes suffer from low product yields, prone to seal failure, and are complex and costly. Therefore, developing a battery top cover structure that eliminates the need for welding or riveting remains a pressing technical challenge in this field.

[0125] In view of this, the present application provides a third battery top cover structure and battery, which does not require welding, riveting and other processes to fix the poles, thereby improving the yield of product production and simplifying the production process.

[0126] An exemplary battery top cover structure is as follows:

[0127] FIG1 is a schematic diagram of the structure of a battery top cover structure provided in one embodiment of the present application. FIG11 is a schematic diagram of a partial structure of a battery top cover structure provided in another embodiment of the present application. FIG3 is a schematic diagram of the structure of a pole in a battery top cover structure provided in another embodiment of the present application. FIG4 is a schematic diagram of the cross-sectional structure of FIG3. The present application provides a battery top cover structure. In one embodiment, referring to FIG1, FIG11, FIG3 and FIG4, the battery top cover structure includes: a pole 2, a top cover sheet 1 and an upper plastic 4.

[0128] The pole 2 includes a body 20 and a first raised portion 21, with the first raised portion 21 disposed at the top of the body 20. The top cover 1 includes a first through-hole 11, through which the body 20 passes. The upper plastic member 4 includes a first ring 41 and a second ring 42 connected to each other. The first ring 41 is located between the upper surface of the top cover 1 and the first raised portion 21, and the second ring 42 is at least partially located between the body 20 and the wall of the first through-hole 11. The cross-sectional shape of the upper surface of the transition portion between the first ring 41 and the second ring 42 is an arc.

[0129] In this embodiment, the first raised portion 21 is formed through a flanging process, and the top cover sheet 1 and upper plastic 4 secure the pole 2 from above, eliminating the need for welding, riveting, or other methods to secure the pole. This improves product yield and simplifies the production process. Because the inner edge of the third through hole 60 has an oblique or arc-shaped cross-section, and the diameter of the third through hole 60 gradually increases or decreases from top to bottom, the vertical creepage distance between the pole 2 and the top cover sheet 1 is increased, reducing the probability of a short circuit between the pole 2 and the top cover sheet 1. Furthermore, during the flanging process, the first protrusion 21 gradually unfolds outward and presses down on the gasket 3, the upper plastic 4, and the top cover sheet 1. The sealing ring 5 gradually expands toward the third through hole 60 during the extrusion process, causing the sealing ring 5 to gradually fill the gap formed by the third through hole 60, the top cover sheet 1, and the second ring body 42. During this process, the third through hole 60, which has an oblique or arcuate cross-section, gradually contacts the gradually expanding sealing ring 5, thereby ensuring uniform force on the sealing ring 5 during the filling process and preventing burrs, cracks, and debris from forming on the contact surface between the sealing ring 5 and the third through hole 60. The arcuate cross-section of the upper surface of the transition portion between the first ring body 41 and the second ring body 42 can prevent burrs from forming at the turning point of the upper plastic 4 and can also extend the contact time between the first protrusion 21 and the upper plastic 4 when the first protrusion 21 is flanging downward, thereby buffering the pressure exerted by the first protrusion 21 on the upper plastic 4 during the flanging process. The groove 44 provided at the bottom of the transition portion between the first ring body 41 and the second ring body 42 can prevent the corner of the top cover sheet 1 facing the transition portion from being damaged by excessive pressure from the upper plastic 4 when the upper plastic 4 is subjected to downward pressure.

[0130] In one embodiment, referring to FIG. 1 , FIG. 11 , FIG. 3 and FIG. 4 , the battery top cover structure includes: a terminal 2 , a lower plastic 6 , a sealing ring 5 , a top cover sheet 1 , an upper plastic 4 and a gasket 3 .

[0131] The terminal 2 includes a body 20, a first raised portion 21, and a second raised portion 22. The first raised portion 21 is formed on the circumferential surface of the top of the body 20 through a flanging process. The second raised portion 22 is located at the bottom of the body 20 and protrudes from the circumferential surface of the body 20. Specifically, the body 20 is cylindrical, the shape of the second raised portion 22 is not limited, and the first raised portion 21 is a structure formed on the top of the body 20 through a flanging process.

[0132] The lower plastic 6 includes a third through hole 60, through which the column portion 20 passes. The lower plastic 6 is configured to limit the second protrusion 22 below the third through hole 60, that is, the second protrusion 22 is limited and fixed by the third through hole 60. The cross-sectional shape of the inner edge of the third through hole 60 is an oblique line or an arc line, and the diameter of the third through hole 60 gradually increases or decreases along the direction from the first protrusion 21 to the second protrusion 22.

[0133] The top cover piece 1 is disposed on the top surface of the lower plastic 6 . The top cover piece 1 includes a first through hole 11 , and the column portion 20 passes through the first through hole.

[0134] The sealing ring 5 is sleeved on the column portion 20 . The outer diameter of the sealing ring 5 is larger than the diameter of the third through hole 60 . The sealing ring 5 is located between the top surface of the second protrusion 22 and the bottom surface of the top cover 1 .

[0135] The upper plastic 4 includes a first ring body 41 and a second ring body 42. The first ring body 41 is connected to the outer circumference 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. The first gap is the gap between the first protrusion 21 and the top cover sheet 1, and the second gap is the gap between the first through hole and the column portion 20.

[0136] The gasket 3 is annular in shape and is sleeved on the column portion 20 . The gasket 3 is disposed between the lower surface of the first protrusion 21 and the upper surface of the upper plastic.

[0137] When this embodiment is used, a first raised portion 21 is formed by a flanging process, and then the pole 2 is fixed from below by the lower plastic 6. The pole 2 is fixed from above by the top cover sheet 1 and the upper plastic 4. There is no need to use welding, riveting or other processes to fix the pole, which improves the yield rate of product production and simplifies the production process. The gap between the pole 2 and the lower plastic 6 is sealed by the sealing ring 5. Because the cross-sectional shape of the inner edge of the third through hole 60 is an oblique line or an arc, the diameter of the third through hole 60 gradually increases or decreases from top to bottom, thereby increasing the creepage distance between the pole 2 and the top cover sheet 1 in the vertical direction, reducing the probability of short circuit between the pole 2 and the top cover sheet 1. Furthermore, during the flanging process, the first raised portion 21 gradually turns outward and presses down on the gasket 3, the upper plastic 4, the top cover sheet 1, and the sealing ring 5. During the extrusion process, the sealing ring 5 gradually spreads and expands toward the third through hole 60, so that the sealing ring 5 gradually fills the gap formed by the third through hole 60, the second raised portion 22, the top cover sheet 1, and the second ring body 42. During this period, the third through hole 60, which has an oblique or arc-shaped cross-section, gradually contacts the gradually expanding sealing ring 5, thereby evenly applying force to the sealing ring 5 during the filling process, preventing burrs, cracks, and debris from forming on the contact surface between the sealing ring 5 and the third through hole 60. Furthermore, by interposing the gasket 3 between the first raised portion 21 and the upper plastic 4, the upper plastic 4 can be protected from direct pressure from the first raised portion 21 during the flanging process, thereby preventing cracking of the upper plastic 4. The cross-sectional shape of the upper surface of the transition portion between the first ring body 41 and the second ring body 42 is an arc, which can avoid burrs at the turning position of the upper plastic 4; and the arc cross-sectional shape of the transition portion can also prolong the contact time between the first protrusion 21 and the upper plastic 4 when the first protrusion 21 is turned downward, thereby buffering the pressure exerted on the upper plastic 4 by the first protrusion 21 during the downward turning process.

[0138] In one embodiment, as shown in FIG1 , the top cover sheet 1 and the lower plastic 6 are long plate structures. The battery top cover structure further includes an explosion-proof valve 7 and an explosion-proof valve protection sheet 8. A hole for installing the explosion-proof valve 7 and the explosion-proof valve protection sheet 8 is provided in the middle of the top cover sheet 1.

[0139] Specifically, referring to Figure 1, when assembling the battery top cover structure, first, the unflanged pole 2 is passed upward from the bottom of the lower plastic 6 into the third through hole 60, and then the sealing ring 5 is put on the column part 20. Then, the first through hole 11 of the top cover sheet 1 is put on the column part 20 from above, and then the upper plastic 4 and the gasket 3 are inserted from above in sequence. Finally, the flanging process is performed, and the first protrusion 21 is turned 90 degrees to press the gasket 3.

[0140] In one embodiment, the gasket 3 is made of a material including metal to ensure that the gasket 3 has sufficient strength to withstand the downward pressure of the first protrusion 21 during the flanging process. Specifically, the gasket 3 can be made of a strong material such as metal or alloy.

[0141] In one embodiment, the gasket 3 is made of one or more materials selected from bakelite, polyphenylene sulfide, and ceramics, so that the gasket 3 can have a certain degree of insulation while ensuring strength.

[0142] In one embodiment, the elastic modulus of the gasket 3 is greater than or equal to the elastic modulus of the first protrusion 21 , ensuring that the gasket 3 has sufficient anti-deformation strength when bearing the flange pressure of the first protrusion 21 , thereby protecting the upper plastic 4 .

[0143] In one embodiment, the hardness of the gasket 3 is greater than or equal to the hardness of the first protrusion 21 , ensuring that the gasket 3 can withstand the pressure when the first protrusion 21 is flanging.

[0144] In one embodiment, the ratio of the thickness of the gasket 3 to the thickness of the first protrusion 21 is greater than or equal to 0.05 and less than or equal to 2, ensuring that the gasket 3 has sufficient thickness to withstand the flanging pressure of the first protrusion 21 .

[0145] In one embodiment, the outer diameter of the gasket 3 is larger than the aperture of the first through hole 11 , ensuring that the gasket 3 is located above the first through hole 11 , thereby protecting the upper plastic 4 .

[0146] In one embodiment, referring to FIG11 , the ratio of the inner diameter of the gasket 3 to the diameter L4 of the column portion 20 is greater than or equal to 1 and less than or equal to 1.5. This ensures that the gasket 3 can provide adequate support. If the ratio is less than 1, the gasket 3 cannot be assembled and fitted onto the column portion 20. If the ratio is greater than 1.5, the gap between the gasket 3 and the column portion 20 is too large to effectively withstand the folding pressure from the first protrusion 21, thereby failing to effectively protect the upper plastic 4.

[0147] In one embodiment, referring to FIG11 , the first protrusion 21 is annular in shape, and the ratio of the outer diameter L3 of the first protrusion 21 to the outer diameter of the gasket 3 is greater than or equal to 1 and less than or equal to 1.5. This prevents the gasket 3 from being too large. If this ratio is less than 1, the outer wall of the gasket 3 protrudes beyond the outer wall of the first protrusion, making assembly difficult. If L3 / M1 is greater than 1.5, the outer wall of the gasket 3 is significantly different from the outer wall of the first protrusion, making it easy for residual dirt to accumulate.

[0148] Figure 8 is a partial schematic diagram of a battery top cover structure according to another embodiment of the present application. In one embodiment, as shown in Figure 8 , the top cover sheet 1 includes a positioning recess 10 disposed around the first through hole 11. Positioning recess 10 is recessed into the top surface of the top cover sheet 1 and serves to position the upper plastic 4. While retaining the upper plastic 4, positioning recess 10 also reduces the upward protrusion of the terminal 2, thereby reducing the overall height of the battery top cover structure.

[0149] In one embodiment, as shown in FIG8 , the lower plastic 6 includes an upwardly projecting third protrusion 61 surrounding the third through-hole 60. The third protrusion 61 is configured to form a recessed area 62 on the bottom surface of the lower plastic 6. The edge profile of the recessed area 62 matches the edge profile of the second protrusion 22. The recessed area 62 can limit the second protrusion 22 from all sides, preventing relative displacement between the pole 2 and the lower plastic 5.

[0150] In one embodiment, the thickness of the sealing ring 5 is greater than or equal to the thickness of the third protrusion 61 , ensuring that during the flanging process, the sealing ring 5 can be squeezed and expanded when the first protrusion 21 is pressed downward, thereby ensuring the sealing between the lower plastic 6 and the pole 2 .

[0151] In one embodiment, the top cover sheet 1 includes a recessed portion 12 surrounding the first through hole 11. The recessed portion 12 is recessed into the bottom surface of the top cover sheet 1, and the edge profile of the recessed portion 12 matches the edge profile of the third raised portion 61. The recessed portion 12 restricts the third raised portion 61 from all sides, preventing relative displacement between the top cover sheet 1 and the lower plastic 6.

[0152] In one embodiment, referring to FIG8 , the ratio of the diameter of the first through hole 11 to the sum of the dimensions (the sum of the diameter L4 of the column portion 20 and the horizontal wall thickness D1 of the second ring body 42) is greater than 1. If this ratio is less than or equal to 1, assembly may become difficult or even impossible.

[0153] In one embodiment, the ratio of the outer diameter of the gasket 3 to the aperture of the first through hole 11 is greater than or equal to 1 and less than or equal to 2. When the ratio is less than 1, the gasket 3 is too small; when the ratio is greater than 2, the gasket 3 is too large, resulting in material waste.

[0154] In one embodiment, the wall thickness of the second ring body 42 is greater than or equal to 0.1 mm and less than or equal to 3 mm. A wall thickness less than 0.1 mm is too thin, resulting in insufficient structural strength and insulation performance of the upper plastic 4. A wall thickness greater than 3 mm is too thick, resulting in wasted material and increased costs.

[0155] 3 and 4 , the pole 2 further includes a fourth protrusion 23 disposed on the top surface of the body 20. The fourth protrusion 23 protruding from the top surface of the body 20 facilitates busbar welding.

[0156] In one embodiment, an annular groove 24 is provided between the fourth protrusion 23 and the first protrusion 21. The annular groove 24 is used as a fulcrum for the flanging device. The first protrusion 21 before flanging is initially a circular ring standing upright on the top surface of the cylindrical portion 20. The fulcrum of the flanging device is abutted against the annular groove 24, and then the first protrusion 21 in the initial state is pushed outward, so that the first protrusion 21 is gradually folded outward 90°, forming the state shown in Figures 2 to 5.

[0157] In one embodiment, as shown in FIG4 , the cross-sectional shape of the outer wall of the annular groove 24 is a slant line or an arc line, that is, during the folding process of the first protrusion 21 , the transition portion between the first protrusion 21 and the column portion 20 forms a slant line or an arc line.

[0158] In one embodiment, the ratio of the vertical depth of the annular groove 24 to the thickness of the first protrusion 21 is greater than or equal to 1 and less than or equal to any value between 3 and 5. If the ratio is greater than 5, the annular groove 24 may be too deep, and the interface between the first protrusion 21 and the column portion 20 during the flanged portion may be prone to fracture and deformation; if the ratio is less than 1, the annular groove 24 may be too shallow, making flanged portion difficult to form.

[0159] In one embodiment, the fourth protrusion 23 is cylindrical, and the ratio of the width of the annular groove 24 to the diameter of the fourth protrusion 23 is greater than or equal to 0.01 and less than or equal to 0.5. If this ratio is less than 0.01, the annular groove 24 may be too narrow, making it difficult for the flanging equipment to insert and apply force. If this ratio is greater than 0.5, the fourth protrusion 23 may be too small, resulting in a small busbar welding area and weakened current carrying capacity of the pole. If this ratio is greater than 0.5, the annular groove 24 may be too wide, resulting in an oversized pole 2 and increased cost.

[0160] In one embodiment, the width of the annular groove 24 is greater than or equal to 0.5 mm and less than or equal to 8 mm, so that the width of the annular groove 24 is within an appropriate range to avoid the annular groove 24 being too narrow to be flanged or too wide and the pole 2 being too large.

[0161] In one embodiment, the top surface of the fourth protrusion 23 is higher than or parallel to the upper end surface of the first protrusion 21 to prevent the upper end surface of the first protrusion 21 from interfering with the welding process when busbar welding is performed on the fourth protrusion 23 .

[0162] In one embodiment, the ratio of the second distance to the first distance is greater than or equal to 1 and less than or equal to any value between 2 and 3. The first distance is the distance between the top surface of the fourth protrusion 23 and the top surface of the top cover sheet 1, and the second distance is the distance between the top surface of the first protrusion 21 and the top surface of the top cover sheet 1. The ratio of the third distance to the second distance is greater than or equal to 1 and less than or equal to any value between 3 and 5. The third distance is the distance between the top surface of the upper plastic 4 and the top surface of the top cover sheet 1. This embodiment limits the size of the top cover sheet 1 and the upper plastic 4 to prevent the upper plastic 4 from being too large and colliding with other equipment.

[0163] In one embodiment, as shown in Figures 11 and 8, the cross-sectional shape of the lower end surface of the second ring body 42 is an arc, which can effectively increase the creepage distance between the column portion 20 and the top cover piece 1 in the left and right directions, and reduce the probability of short circuit between the pole 2 and the top cover piece 1.

[0164] In one embodiment, as shown in FIG11 , the lower end surface of the second ring body 42 contacts the upper end surface of the sealing ring 5 to prevent a short circuit between the column portion 20 and the inner wall of the first through hole 11 of the top cover plate 1 due to the lack of an insulating barrier.

[0165] In one embodiment, the thickness of the second ring body 42 is greater than or equal to 0.3 mm, ensuring sufficient insulation between the column portion 20 and the top cover sheet 1 .

[0166] Figure 9 is a schematic diagram of the structure of a gasket in a battery top cover structure provided by one embodiment of the present application. In one embodiment, as shown in Figure 9, the battery top cover structure further includes a first auxiliary gasket 30. The first auxiliary gasket 30 is annular in shape and is connected to the bottom of the gasket 3. The first auxiliary gasket 30 is embedded between the column portion 20 and the second ring body 42. The first auxiliary gasket 30 can protect the second ring body 42 of the upper plastic 4 and prevent the upper plastic 4 from cracking.

[0167] In one embodiment, as shown in FIG11 , the upper plastic 4 further includes a third ring 43 , which is disposed on the top surface of the second ring 42 and surrounds the outer side of the first protrusion 21 . The third ring 43 can limit and fix the first protrusion 21 from all sides, thereby further preventing displacement between the upper plastic 4 and the pole 2 .

[0168] Figure 10 is a schematic diagram of the structure of a gasket in a battery top cover structure according to another embodiment of the present application. In one embodiment, as shown in Figure 10, the battery top cover structure further includes a second auxiliary gasket 31. The second auxiliary gasket 31 is annular in shape and is disposed on top of the gasket 3. The second auxiliary gasket 31 is embedded between the first protrusion 21 and the third ring body 43. The second auxiliary gasket 31 can protect the third ring body 43 and prevent the upper plastic 4 from cracking.

[0169] The present application also proposes a battery, which includes the aforementioned battery top cover structure, and the battery top cover structure is installed on the battery cell.

[0170] The basic principles of the present application have been described above in conjunction with specific embodiments. However, it should be noted that the advantages, strengths, and effects mentioned in this application are merely illustrative and not restrictive, and it should not be assumed that these advantages, strengths, and effects are required of each embodiment of this application. In addition, the specific details disclosed above are merely illustrative and facilitating understanding, and are not restrictive. The above details do not limit this application to necessarily being implemented using the above specific details.

[0171] The block diagrams of the devices, devices, equipment, and systems involved in this application are merely illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the block diagrams. As will be appreciated by those skilled in the art, these devices, devices, equipment, and systems can be connected, arranged, or configured in any manner. Words such as "include," "comprise," "have," and the like are open-ended words, meaning "including but not limited to," and can be used interchangeably therewith. The words "or" and "and" used herein refer to the words "and / or" and can be used interchangeably therewith, unless the context clearly indicates otherwise. The word "such as" used herein refers to the phrase "such as but not limited to," and can be used interchangeably therewith.

[0172] It should also be noted that in the apparatus, device, and method of the present application, each component or each step can be decomposed and / or recombined, and such decomposition and / or recombination should be regarded as equivalent solutions of the present application.

[0173] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other aspects without departing from the scope of the present application. Therefore, the present application is not intended to be limited to the aspects shown herein, but rather to be applied in the widest sense consistent with the principles and novel features of this utility model.

[0174] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A battery top cover structure, characterized in that: include: The lower plastic (6) comprises a third through hole (60), wherein the third through hole (60) is sleeved on the pole (2), and the cross-sectional shape of the inner edge of the third through hole (60) is at least partially an oblique line or an arc line; and A sealing ring (5) is sleeved on the pole (2), and at least a portion of the sealing ring (5) is located between the third through hole (60) and the pole (2).

2. The battery top cover structure according to claim 1, characterized in that: The cross-sectional shape of the inner edge of the third through hole (60) includes at least two discontinuous oblique lines or at least two arc lines.

3. The battery top cover structure according to claim 1, characterized in that: Also includes: A pole (2), comprising a column portion (20), a first protruding portion (21) and a second protruding portion (22), wherein the first protruding portion (21) is arranged at the top end of the column portion (20), the second protruding portion (22) is arranged on the circumferential surface of the bottom of the column portion (20), and the third through hole (60) is sleeved on the column portion (20); A top cover sheet (1) is arranged on the top surface of the lower plastic (6), the top cover sheet (1) comprises a first through hole (11), and the column portion (20) passes through the first through hole (11); The sealing ring (5) is at least partially located between the second protruding portion (22) and the bottom surface of the top cover sheet (1); and The upper plastic (4) comprises a first ring body (41) and a second ring body (42) which are connected to each other, wherein the first ring body (41) is located between the upper surface of the top cover sheet (1) and the first protruding portion (21), and the second ring body (42) is at least partially located between the columnar portion (20) and the hole wall of the first through hole (11).

4. The battery top cover structure according to claim 1, characterized in that: The lower plastic (6) comprises a third protrusion (61) arranged around the third 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, characterized in that: The thickness of the sealing ring (5) is greater than or equal to the thickness of the third protruding portion (61).

6. The battery top cover structure according to claim 4, characterized in that: The top cover sheet (1) comprises a recessed portion (12) arranged around the first through hole (11), the recessed portion (12) being recessed in the bottom surface of the top cover sheet (1), and the edge profile of the recessed portion (12) matches the edge profile of the third protruding portion (61).

7. The battery top cover structure according to claim 6, characterized in that: The sum of the first size and the second size is less than or equal to the sum of the third size and the fourth size, the first size is the depth D1 of the recessed portion (12), the second size is the body thickness D2 of the lower plastic (6), the third size is the thickness D3 of the third protruding portion (61), and the fourth size is the thickness D4 of the second protruding portion (22).

8. The battery top cover structure according to claim 7, characterized in that: The first size is greater than or equal to the third size.

9. The battery top cover structure according to claim 7, characterized in that: The third dimension is greater than or equal to 0.1 mm.

10. The battery top cover structure according to claim 7, characterized in that: The second dimension is greater than or equal to 0.1 mm.

11. The battery top cover structure according to claim 4, characterized in that: It also includes a ventilation groove (63), which is arranged on the top of the third protruding portion (61), and the ventilation groove (63) is connected from the third through hole (60) to the outer edge of the third protruding portion (61).

12. The battery top cover structure according to claim 4, characterized in that: It also includes a ventilation groove (63), the ventilation groove (63) is arranged at the bottom of the third protruding portion (61), and an auxiliary ventilation groove (64) is arranged on the side wall of the recessed area (62), the ventilation groove (63) is connected from the third through hole (60) to the auxiliary ventilation groove (64), and the auxiliary ventilation groove (64) is connected from the ventilation groove (63) to the bottom surface of the lower plastic (6).

13. The battery top cover structure according to claim 11 or 12, characterized in that: 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 value between 0.2 and 0.5, the fifth dimension is the horizontal length of the ventilation groove (63), and the sixth dimension is the dimension of the third protrusion (61) along the horizontal length direction of the ventilation groove (63).

14. The battery top cover structure according to claim 11 or 12, characterized in that: 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 value between 0.2 and 0.4, the seventh dimension is the width of the ventilation groove (63), and the eighth dimension is the dimension of the third protrusion (61) along the width direction of the ventilation groove (63).

15. The battery top cover structure according to claim 3, characterized in that: The top cover sheet comprises a positioning recess (10) arranged around the first through hole (11); the positioning recess (10) is recessed in the top surface of the top cover sheet (1); and the positioning recess (10) is configured to limit the upper plastic (4).

16. The battery top cover structure according to claim 3, characterized in that: It also comprises a gasket (3) having a second through hole, wherein the second through hole is sleeved on the column portion (20), and the gasket (3) is arranged between the lower surface of the first protruding portion (21) and the upper surface of the first ring body (41).

17. The battery top cover structure according to claim 16, characterized in that: The first corner, the second corner and the third corner are located within a preset angle range with the fourth corner as an end point, the first corner is the upper junction between the first ring body (41) and the second ring body (42), the second corner is the corner of the top of the second through hole, the third corner is the upper junction between the first protruding portion (21) and the column portion (20), and the fourth corner is the corner of the top of the first through hole (11); The preset angle range is composed of a first ray and a second ray, and the first ray and the second ray are based on a preset coordinate system. The preset coordinate system takes the fourth corner as the coordinate origin and the plumb plane as the XY plane. The expression of the first ray is y1=kx+b1, and the expression of the second ray is y2=kx+b2; wherein, 20≥k≥0, 5>b1>b2>-5.

18. The battery top cover structure according to claim 16, characterized in that: The ratio of the hole diameter of the first through hole (11) to the sum of dimensions is greater than 1, and the sum of dimensions is the sum of the diameter of the column part (20) and the wall thickness of the second ring body (42).

19. The battery top cover structure according to claim 18, characterized in that: The ratio of the outer diameter of the gasket (3) to the aperture of the first through hole (11) is greater than or equal to 1 and less than or equal to 2.

20. The battery top cover structure according to claim 18, characterized in that: The wall thickness of the second ring body (42) is greater than or equal to 0.1 mm and less than or equal to 3 mm.

21. The battery top cover structure according to claim 3, characterized in that: The pole (2) further comprises a fourth protrusion (23), wherein the fourth protrusion (23) is arranged on the top surface of the column part (20).

22. The battery top cover structure according to claim 21, characterized in that: An annular groove (24) is provided between the fourth protruding portion (23) and the first protruding portion (21).

23. The battery top cover structure according to claim 22, characterized in that: The cross-sectional shape of the wall surface of the annular groove (24) facing outward is an oblique line or an arc line.

24. The battery top cover structure according to claim 22, characterized in that: The ratio of the depth of the annular groove (24) to the thickness of the first protrusion (21) is greater than or equal to 1, and less than or equal to any value between 3 and 5.

25. The battery top cover structure according to claim 22, characterized in that: The fourth protrusion (23) is in the shape of a cylinder, and the ratio of the groove width of the annular groove (24) to the diameter of the fourth protrusion (23) is greater than or equal to 0.01 and less than or equal to 0.

5.

26. The battery top cover structure according to claim 22, characterized in that: The groove width of the annular groove (24) is greater than or equal to 0.5 mm and less than or equal to 8 mm.

27. The battery top cover structure according to claim 21, characterized in that: The top surface of the fourth protruding portion (23) is higher than or parallel to the upper end surface of the first protruding portion (21).

28. The battery top cover structure according to claim 21, characterized in that: The ratio of the second distance to the first distance is greater than or equal to 1 and less than or equal to any value from 2 to 3, the first distance is the distance between the top surface of the fourth protrusion (23) and the top surface of the top cover sheet (1), and the second distance is the distance between the top surface of the first protrusion (21) and the top surface of the top cover sheet (1); the ratio of the third distance to the second distance is greater than or equal to 1 and less than or equal to any value from 3 to 5, and the third distance is the distance between the top surface of the upper plastic (4) and the top surface of the top cover sheet (1).

29. The battery top cover structure according to claim 16, characterized in that: Also includes: The first auxiliary gasket (30) is annular in shape. The first auxiliary gasket (30) is arranged at the bottom of the gasket (3). The first auxiliary gasket (30) is embedded between the column part (20) and the second ring body (42).

30. The battery top cover structure according to claim 16, characterized in that: The plastic upper layer also includes: The third ring body (43) is arranged on the top surface of the second ring body (42), and the third ring body (43) surrounds the outer side of the first protruding portion.

31. The battery top cover structure according to claim 30, characterized in that: Also includes: The second auxiliary gasket (31) is annular in shape. The second auxiliary gasket (31) is arranged on the top of the gasket (3). The second auxiliary gasket (31) is embedded between the first protruding portion (21) and the third ring body (43).

32. The battery top cover structure according to claim 16, characterized in that: The cross-sectional shape of the upper surface of the transition portion between the first ring body (41) and the second ring body (42) is an arc, and / or the bottom of the transition portion between the first ring body (41) and the second ring body (42) has a groove.

33. The battery top cover structure according to claim 32, characterized in that: The elastic modulus of the gasket (3) is greater than or equal to the elastic modulus of the first protrusion (21), and / or the hardness of the gasket (3) is greater than or equal to the hardness of the first protrusion (21).

34. The battery top cover structure according to claim 32, characterized in that: The ratio of the thickness of the gasket (3) to the thickness of the first protruding portion (21) is greater than or equal to 0.05 and less than or equal to 2.

35. The battery top cover structure according to claim 32, characterized in that: The outer diameter of the gasket (3) is greater than the hole diameter of the first through hole (11).

36. The battery top cover structure according to claim 32, characterized in that: The ratio of the inner hole diameter of the gasket (3) to the diameter of the columnar portion (20) is greater than or equal to 1 and less than or equal to 1.

5.

37. The battery top cover structure according to claim 32, characterized in that: The cross-sectional shape of the lower end surface of the second ring body (42) is an arc.

38. The battery top cover structure according to claim 32, characterized in that: The thickness of the second ring body (42) is greater than or equal to 0.3 mm.

39. A battery, characterized in that: A battery top cover structure comprising the battery top cover structure as claimed in any one of claims 1 to 38.

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