Pole assembly, end cover assembly, battery, energy storage device and electric equipment

Abstract

The utility model provides a pole assembly, an end cover assembly, a battery, an energy storage device and electric equipment. The pole assembly comprises a pole and a sealing ring, the pole comprises a pole body, a base and an end cap, one end of the pole body is connected with the base, the other end of the pole body is connected with the end cap, the cross sectional area of the pole body is smaller than that of the base, and the cross sectional area of the pole body is smaller than that of the end cap. The sealing ring is arranged on the periphery of the pole body in a sleeving mode and located on the upper surface of the base, the sealing ring comprises a sealing ring body and a plurality of first limiting structures, and the first limiting structures are arranged on the side, facing the axis of the sealing ring, of the sealing ring body and are arranged in the circumferential direction of the sealing ring body at intervals. The pole assembly provided by the utility model can solve the technical problem that the safety performance of the battery is influenced due to the fact that the sealing ring is easy to misplace or turn on one side in the prior art.

Description

[0001] This application claims the priority of the Chinese patent application filed with the China Patent Office on December 16, 2022, with application number 202211625859.2 and application name "Pole assembly, end cover assembly, battery, energy storage device and electrical equipment", all contents of which are incorporated by reference in this application. Technical Field

[0002] The present application relates to the field of battery technology, and in particular to a pole assembly, an end cover assembly, a battery, an energy storage device and an electrical device. Background Art

[0003] Rechargeable batteries are widely used in electric vehicles, mobile devices and other fields due to their advantages such as high energy density, high power density, many cycles and long storage time.

[0004] The sealing ring is an important sealing structure in the battery pole assembly. After the existing sealing ring is inserted into the pole, it is easy for the sealing ring to be misplaced or overturned during the processing and handling of the semi-finished product or the injection molding process, resulting in poor airtightness of the pole assembly and battery leakage, which greatly affects the safety performance of the battery. Summary of the invention

[0005] The present application provides a pole assembly, an end cover assembly, a battery, an energy storage device and an electrical device to solve the technical problem in the prior art that the sealing ring is easily misplaced or overturned, thus affecting the safety performance of the battery.

[0006] To solve the above problems, in a first aspect, the present application provides a pole assembly, comprising:

[0007] A pole and a sealing ring, the pole includes a pole body, a base and an end cap, one end of the pole body is connected to the base, the other end of the pole body is connected to the end cap, the cross-sectional area of ​​the pole body is smaller than the cross-sectional area of ​​the base, the cross-sectional area of ​​the pole body is smaller than the cross-sectional area of ​​the end cap, the sealing ring is sleeved on the periphery of the pole body and located on the upper surface of the base, the sealing ring includes a sealing ring body and a plurality of first limiting structures, the plurality of first limiting structures are arranged on one side of the sealing ring body facing the axis of the sealing ring, and the plurality of first limiting structures are arranged at intervals along the circumference of the sealing ring body.

[0008] By arranging a plurality of first limiting structures at circumferential intervals on one side of the sealing ring body toward the sealing ring axis, when the sealing ring is assembled with the pole, the plurality of first limiting structures can provide a uniform limiting support force for the pole body, thereby greatly reducing the degree of deviation between the sealing ring and the pole, and reducing the probability of the sealing ring being misplaced or tipping over, thereby being more conducive to exerting the sealing performance of the sealing ring in the end cover assembly and ensuring the safety performance of the battery.

[0009] In a second aspect, the present application provides an end cover assembly, comprising an upper plastic, an end cover, a lower plastic and at least one of the above-mentioned pole assemblies, the end cover and the lower plastic are stacked, the end cover is provided with a first through hole for the pole body and the end cap to pass through, the lower plastic is provided with a second through hole for the pole body and the end cap to pass through, the sealing ring is located between the second through hole and the pole body, the sealing ring and the end cover are interference fit, the base is located on the lower surface of the lower plastic, the pole body passes through the second through hole and the first through hole, and the end cap is connected to the upper plastic,

[0010] The upper plastic includes a first part, a second part and a third part which are connected to each other. The first part wraps the side wall surface and part of the upper surface of the end cover close to the pole body, the second part is located in the gap between the side wall surface of the end cover and the side wall surface of the pole body, the third part is located below the end cover close to the pole body, and the third part is located in the gap between the sealing ring body and the pole body.

[0011] When the upper plastic is injection molded, one end of the end cap is pressed against the upper surface of the sealing ring body, forming a certain abutting force on the sealing ring, and the injection liquid flows into the gap between the side wall of the end cap and the side wall of the pole body, thereby realizing a tight connection between the end cap, the upper plastic, and the pole. The injection liquid continues to flow to the gap between the sealing ring body and the pole body under the end cap. After the injection molding is completed, the lower surface of the third part of the upper plastic contacts the upper surface of the base, and one end of the side wall of the third part of the upper plastic is connected to the side wall of the pole, and the other end is connected to the inner ring surface of the sealing ring body and the side wall of the first limiting structure. After injection molding, the upper plastic abuts against the end cap, the sealing ring, and the pole at the same time, making the sealing ring and the pole fit more tightly and reliably, so as to fully reduce the misalignment and rollover of the sealing ring during assembly, ensure the sealing effect of the sealing ring, reduce the leakage of the end cap assembly, and ensure the safety performance of the battery.

[0012] In a third aspect, the present application provides a battery comprising at least one of the above-mentioned end cover assemblies.

[0013] In a fourth aspect, the present application provides an energy storage device comprising at least one of the above-mentioned batteries.

[0014] In a fifth aspect, the present application provides an electrical device comprising at least one of the above-mentioned energy storage devices.

[0015] In summary, by arranging a plurality of first limiting structures at circumferential intervals on the side of the sealing ring body toward the sealing ring axis, when the sealing ring is assembled with the pole, the plurality of first limiting structures can provide a uniform limiting support force for the pole body, greatly reducing the degree of deviation between the sealing ring and the pole, and reducing the probability of the sealing ring being misplaced or tipping over, thereby being more conducive to exerting the sealing performance of the sealing ring in the end cover assembly and ensuring the safety performance of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the background technology, the drawings required for use in the embodiments of the present application or the background technology will be described below.

[0017] Figure 1 It is a structural schematic diagram of an electrical device provided in an embodiment of the present application;

[0018] Figure 2 yes Figure 1 A schematic diagram of the structure of an energy storage device in an electrical device shown;

[0019] Figure 3 yes Figure 2 A schematic diagram of the structure of a battery in the energy storage device shown;

[0020] Figure 4 yes Figure 3 An exploded schematic diagram of the battery shown;

[0021] Figure 5 yes Figure 3 A schematic diagram of the structure of the end cap assembly in the battery shown;

[0022] Figure 6 yes Figure 5 An exploded schematic diagram of the end cap assembly shown;

[0023] Figure 7 yes Figure 5 A schematic cross-sectional structure diagram of the end cover assembly shown;

[0024] Figure 8 yes Figure 5 A schematic diagram of the structure of the pole assembly in the end cover assembly shown;

[0025] Fig. 9 yes Figure 8 An exploded schematic diagram of the pole assembly shown;

[0026] Fig.10 A schematic diagram of the structure of the first sealing ring provided in an embodiment of the present application;

[0027] Fig.11 A schematic diagram of the structure of a second sealing ring provided in an embodiment of the present application;

[0028] Fig.12 A schematic diagram of the structure of a third sealing ring provided in an embodiment of the present application;

[0029] Fig.13 A schematic structural diagram of the fourth sealing ring provided in an embodiment of the present application.

[0030] Reference numerals:

[0031] Electrical equipment 400, equipment body 410,

[0032] Energy storage device 300, housing 310,

[0033] Battery 200,

[0034] End cap assembly 100, battery cell 110, housing 120, protective film 121, adapter 130,

[0035] Pole assembly 20,

[0036] Pole 30, end cap 31, pole body 32, base 33, groove 34, welding step 35,

[0037] Sealing ring 40, sealing ring body 41, first limiting structure 42, end 43, connecting section 44, bottom 45, first fillet

[0038] 43a, second fillet 45a, arc surface 43b,

[0039] End cover 50, first through hole 51, third through hole 52, fifth through hole 53,

[0040] The lower plastic 60, the second through hole 61, the fourth through hole 62, the sixth through hole 63, the convex part 64,

[0041] Upper plastic 70, first part 71, second part 72, third part 73,

[0042] Explosion-proof valve 80 and explosion-proof valve protection sheet 81 . DETAILED DESCRIPTION

[0043] The embodiments of the present application are described below in conjunction with the accompanying drawings.

[0044] Embodiments of the present application provide a pole assembly, an end cover assembly, a battery, an energy storage device, and an electrical device.

[0045] See also Figure 1 , Figure 1 4 is a schematic diagram of the structure of the electric device 400 provided in an embodiment of the present application. The electric device 400 includes a device body 410 and an energy storage device 300. The energy storage device 300 can supply power to various devices in the device body 410 that need electricity to meet the operation requirements of the electric device 400. The number of energy storage devices 300 can be one or more. When the number of energy storage devices 300 is multiple, the multiple energy storage devices 300 can be connected in series, or in parallel, or in a mixed connection of series and parallel to achieve a larger capacity and power.

[0046] The electric device 400 may be a vehicle or a drone, etc. The vehicle includes but is not limited to a pure electric vehicle (Pure Electric Vehicle / Battery Electric Vehicle, PEV / BEV), a hybrid electric vehicle (Hybrid Electric Vehicle, HEV), a range extended electric vehicle (Range Extended Electric Vehicle, REEV), a plug-in hybrid electric vehicle (Plug-in Hybrid Electric Vehicle, PHEV) or a new energy vehicle (New Energy Vehicle).

[0047] See also Figure 2 , Figure 2 yes Figure 1 A schematic diagram of the structure of the energy storage device 300 in the electrical equipment 400 shown. The energy storage device 300 includes a housing 310 and a plurality of batteries 200. The plurality of batteries 200 are electrically connected and are all located inside the housing 310. They can be protected from interference from the external environment under the protection of the housing 310. In this embodiment, an energy storage device 300 includes a plurality of batteries 200. The plurality of batteries 200 are arranged at intervals. The plurality of batteries 200 can be connected in series, or in parallel, or in a mixed series and parallel connection to achieve a larger capacity and power.

[0048] See also Figure 3 and Figure 4 , Figure 3 yes Figure 2 A schematic diagram of the structure of the battery 200, Figure 4 yes Figure 3 An exploded schematic diagram of a battery 200 is shown.

[0049] The battery 200 is a secondary battery, for example, a nickel-metal hydride battery, a nickel-cadmium battery, a lead-acid (or lead storage) battery, a lithium-ion battery, a polymer lithium-ion battery, etc. In other embodiments, the battery may also be a lithium-ion primary battery, a lithium-sulfur battery, a sodium-lithium-ion battery or a sodium-ion battery or a magnesium-ion battery, etc.

[0050] In this embodiment, the battery 200 is a rectangular parallelepiped. In other embodiments, the battery 200 may also be a cylindrical body or other shapes. The battery 200 includes an end cap assembly 100, a battery cell 110, a transfer sheet 130, and a housing 120. A protective film 121 may also be attached to the surface of the housing 120. The battery cell 110 is located inside the housing 120. Under the protection of the housing 120 and the protective film 121, it is protected from interference from the external environment. The connection between the battery cell 110 and the end cap assembly 100 is achieved through the transfer sheet 130.

[0051] See also Figure 5 and Figure 6 , Figure 6 yes Figure 5 The end cap assembly 100 is an exploded schematic diagram. The end cap assembly 100 includes: a pole assembly 20, an end cap 50, a lower plastic 60, an upper plastic 70, and an explosion-proof valve 80.

[0052] Among them, the number of pole assemblies 20 can be two, and the two pole assemblies 20 can be a positive pole assembly and a negative pole assembly, respectively. When the positive pole assembly and the negative pole assembly have different structures, one of the positive pole assembly and the negative pole assembly is the pole assembly 20. When the positive pole assembly and the negative pole assembly have the same structure, the positive pole assembly and the negative pole assembly are both pole assemblies 20. In this embodiment, the positive pole assembly and the negative pole assembly have the same structure, and only one pole assembly 20 will be described in detail below. In the absence of conflict, the following description of one pole assembly 20 can be applied to another pole assembly.

[0053] See also Figure 7 , Figure 8 and Fig. 9 , Figure 7 yes Figure 5 The end cap assembly 100 is a cross-sectional view along the AA direction shown in the figure, Figure 8 yes Figure 5 The schematic structural diagram of the pole assembly 20 shown in FIG. Fig. 9 yes Figure 5 An exploded schematic diagram of the pole assembly 20 is shown.

[0054] The pole assembly 20 includes a pole 30 and a sealing ring 40 .

[0055] The pole 30 includes a pole body 32, a base 33 and an end cap 31. The end cap 31 and the base 33 are respectively located at opposite ends of the pole body 32. One end of the pole body 32 is connected to the base 33, and the other end of the pole body 32 is connected to the end cap 31. The cross-sectional area of ​​the pole body 32 is smaller than the cross-sectional area of ​​the base 33, and the cross-sectional area of ​​the pole body 32 is smaller than the cross-sectional area of ​​the end cap 31. That is, the projection of the pole body 32 on the base 33 falls within the base 33, and the projection of the pole body 32 on the end cap 31 falls within the end cap 31. The cross-sectional area of ​​the end cap 31 is less than or equal to the cross-sectional area of ​​the base 33. Among them, the above cross-sectional area is the cross-sectional area cut along a plane parallel to the base 33. Exemplarily, the cross-sectional area of ​​the end cap 31 is smaller than the cross-sectional area of ​​the base 33. In this embodiment, the shape of the pole body 32 and the end cap 31 are both round pole bodies. The height of the base 33 and the end cap 31 is smaller than the height of the pole body 32. By setting the height of the base 33 and the end cap 31 to be smaller than the height of the pole body 32 , the space occupied by the base 33 in the end cover assembly 100 can be reduced, thereby improving the volume energy density of the battery 200 .

[0056] A second limiting structure is provided around the side wall surface of the end cap 31, and the second limiting structure may be a protrusion or a groove. Exemplarily, the second limiting structure is a groove 34. By providing the second limiting structure, the contact area between the end cap 31 and other components can be increased, the connection strength between the pole 30 and other components can be improved, and the pole 30 can be prevented from twisting. A welding step 35 is also provided at one end of the end cap 31 away from the base 33. By providing the welding step 35, it is convenient for the welding tool to fix the pole 30, reduce the impact force on the pole 30 during welding, and affect the structural reliability of the pole 30 and the assembly strength of the end cover assembly 100.

[0057] The sealing ring 40 is sleeved on the periphery of the pole body 32 and is located on the upper surface of the base 33. The upper surface of the base 33 refers to the side of the base 33 facing the end cap 31. The sealing ring 40 includes a sealing ring body 41 and a plurality of first limiting structures 42. The plurality of first limiting structures 42 are arranged on the side of the sealing ring body 41 facing the axis of the sealing ring 40, and the plurality of first limiting structures 42 are arranged at intervals along the circumference of the sealing ring body 41. Preferably, the plurality of first limiting structures 42 are arranged at equal intervals along the circumference of the sealing ring body 41. Along the thickness direction of the sealing ring body 41, the cross-sectional area of ​​each first limiting structure 42 at different thickness positions of the sealing ring body 41 is equal, wherein the above cross-sectional area is the cross-sectional area cut along a plane parallel to the base 33. That is to say, along the thickness direction of the sealing ring body 41, the shape of each first limiting structure 42 is a cylinder. Each first limiting structure 42 includes an end 43 and a bottom 45, the bottom 45 is an end of the first limiting structure 42 connected to the sealing ring body 41, and the end 43 is an end of the first limiting structure 42 away from the sealing ring body 41. The end 43 and the pole body 32 are clearance-fitted or interference-fitted. It can be understood that after the sealing ring 40 and the pole 30 are assembled, among the multiple first limiting structures 42, the ends 43 of all the first limiting structures 42 may be clearance-fitted with the pole body 32, or the ends 43 of all the first limiting structures 42 may be interference-fitted with the pole body 32; or the ends 43 of some of the first limiting structures 42 may be clearance-fitted with the pole body 32, and the ends 43 of some of the first limiting structures 42 may be interference-fitted with the pole body 32.

[0058] The sealing ring structure in the prior art usually only includes the sealing ring body. The inventor has found through research that after the sealing ring in the prior art is assembled with the pole, the concentricity of the sealing ring and the pole is generally between 1.95 and 2.05. Among them, concentricity refers to the distance between the center of the sealing ring and the center of the pole body. When the concentricity is equal to 0, it indicates that the center of the sealing ring and the center of the pole body completely coincide with each other, that is, the axis of the sealing ring and the axis of the pole body coincide with each other, and the sealing ring and the pole are coaxially arranged. When the concentricity is greater than 0, it indicates that the center of the sealing ring and the center of the pole body are offset. The greater the concentricity, the greater the distance between the center of the sealing ring and the center of the pole body, and the greater the degree of offset between the sealing ring and the pole. In this embodiment, by arranging a plurality of first limiting structures 42 at circumferential intervals on the sealing ring body 41 toward the side of the axis of the sealing ring 40, when the sealing ring 40 is assembled with the pole 30, the plurality of first limiting structures 42 can provide a uniform limiting support force for the pole body 32, so that the concentricity range of the sealing ring 40 and the pole 30 is 0 mm to 0.15 mm (including endpoint values ​​0 mm and 15 mm), that is, the distance between the center of the sealing ring 40 and the center of the pole body 32 is 0 mm to 0.15 mm (including endpoint values ​​0 mm and 15 mm), which greatly reduces the degree of deviation of the sealing ring 40 and the pole 30, thereby being more conducive to exerting the sealing performance of the sealing ring 40 in the end cover assembly 100.

[0059] In order to facilitate the sealing ring 40 to be inserted into the pole 30, the diameter of the inner ring of the sealing ring body 41 of the sealing ring 40 is greater than or equal to the diameter of the end cap 31. When the diameter of the inner ring of the sealing ring body 41 of the sealing ring 40 is smaller than the diameter of the end cap 31, it is difficult for the sealing ring 40 to be inserted into the end cap 31, and even if it is inserted with difficulty, it is easy to get stuck on the side wall of the pole body 32, causing the sealing ring 40 to fail to perform the sealing function. When the diameter of the inner ring of the sealing ring body 41 of the sealing ring 40 is much larger than the diameter of the end cap 31, after the sealing ring 40 is inserted into the end cap 31, the gap between the sealing ring 40 and the pole body 32 is too large, resulting in a large space occupied by the pole assembly 20, and also increasing the risk of misalignment of the sealing ring 40, affecting the sealing reliability of the sealing ring 40. Exemplarily, the diameter of the inner ring of the sealing ring body 41 of the sealing ring 40 is slightly larger than the diameter of the end cap 31. For example, the spacing between the projection of the sealing ring body 41 and the end cap 31 on the base 33 can be set to ≤0.1mm, that is, the difference between the diameter of the inner ring of the sealing ring body 41 of the sealing ring 40 and the diameter of the end cap 31 is ≤0.1mm. In this way, when the sealing ring 40 is inserted into the pole 30 from the end cap 31 to the base 33, as long as a slight force is applied to make the first limiting structure 42 avoid the end cap 31, the sealing ring 40 can be inserted into the end cap 31 and fall along the pole body 32 to the upper surface of the base 33.

[0060] In a possible implementation, after the sealing ring 40 is assembled with the pole 30, the end 43 of each first limiting structure 42 is gap-fitted or interference-fitted with the pole body 32. Exemplarily, when the sealing ring 40 is assembled with the pole 30, the end 43 of each first limiting structure 42 is gap-fitted with the pole body 32, and the gap between the end 43 and the pole body 32 is 0.05 mm to 0.15 mm. By setting a certain gap between the end 43 and the pole body 32, it can be ensured that the sealing ring 40 smoothly reaches the upper surface of the base 33, and the probability of the first limiting structure 42 being stuck on the side wall of the pole 30 is reduced. When the gap between the end 43 and the pole body 32 is too large, the limiting and fixing effect of the first limiting structure 42 on the pole 30 is poor, and the risk of misalignment of the sealing ring 40 is also increased.

[0061] In a possible embodiment, the surface of the end 43 facing the pole body 32 is set as an arc surface that is recessed away from the pole body 32 (not shown in the figure), that is, the side wall surface of the end 43 is set as an arc surface that is recessed away from the pole body 32. The radius of the arc surface is r, the diameter of the pole body 32 is D, and the ratio t of the radius r of the arc surface to the diameter D of the pole body 32 is: 1 / 4≤t≤3 / 4. Among them, the radius of the arc surface refers to the radius of the circle where the arc surface is located. When t is 1 / 4≤t≤3 / 4, the side wall surface of the end 43 and the side wall surface of the pole body 32 have a better fit, thereby increasing the supporting and limiting effect of the sealing ring 40 on the pole 30. When the radius r of the arc surface is too small, so that t is less than 1 / 4, the curvature of the arc surface is too large, and the contact area with the side wall of the pole body 32 is greatly reduced, and even changes from surface contact to point contact, which is not conducive to the support and limitation of the pole 30 by the first limiting structure 42; when the radius r of the arc surface is too large, so that t is greater than 3 / 4, the curvature of the arc surface is too small, and the fit between the arc surface and the side wall of the pole body 32 is poor, and the distance between the two changes from large to small and then to large, which is also not conducive to the support and limitation of the pole 30 by the first limiting structure 42.

[0062] The shape of the end cover 50 can be square or circular or other shapes. For example, the shape of the end cover 50 is square. The end cover 50 is provided with a first through hole 51 for the pole 30 pole body 32 to pass through, a third through hole 52 for connecting the explosion-proof valve 80, and a fifth through hole 53 for injection. The through hole area of ​​the first through hole 51 is larger than the cross-sectional area of ​​the pole body 32 and the end cap 31, and smaller than the cross-sectional area of ​​the base 33, so as to limit the pole body 32 from moving out of the first through hole 51 along the direction of the end cover 50 away from the lower plastic 60. Among them, the above cross-sectional area is the cross-sectional area cut along the plane parallel to the base 33. The explosion-proof valve 80 is connected to the third through hole 52, and an explosion-proof valve protection sheet 81 is also provided on the upper surface of the explosion-proof valve 80 to protect the explosion-proof valve 80 from interference from the external environment.

[0063] The shape of the lower plastic 60 can be square or circular or other shapes, and the shape of the lower plastic 60 is the same as that of the end cover 50. Exemplarily, the shape of the lower plastic 60 and the shape of the end cover 50 are both square. The lower plastic 60 and the end cover 50 are stacked. The lower plastic 60 is provided with a second through hole 61 for the pole body 32 of the pole 30 to pass through, a fourth through hole 62 connected to the third through hole 52, and a sixth through hole 63 connected to the fifth through hole 53. The through hole area of ​​the second through hole 61 is larger than the cross-sectional area of ​​the pole body 32 and the end cap 31, and smaller than the cross-sectional area of ​​the base 33, so as to limit the pole body 32 from moving out of the second through hole 61 along the direction of the lower plastic 60 toward the end cover 50. Among them, the above cross-sectional area is the cross-sectional area cut along a plane parallel to the base 33.

[0064] Furthermore, the connection effect between the lower plastic 60 and the end cap 50 can be enhanced by a reinforcement structure. The reinforcement structure can be a matching structure of a convex part and a concave part. The concave part / convex part 64 is located on the side of the lower plastic facing the end cap, and the convex part 64 / concave part is located on the side of the end cap facing the lower plastic. Exemplarily, the lower plastic 60 is provided with a convex part 64, and correspondingly, the end cap 50 is provided with a concave part (not shown in the figure) that matches therewith, and the convex part 64 and the concave part cooperate with each other to enhance the connection effect between the lower plastic 60 and the end cap 50.

[0065] The upper plastic 70 is used to fill the gap between the end cap 50, the sealing ring 40 and the pole 30, and plays a role in positioning and fixing the pole 30, while ensuring the insulation performance between the pole 30 and the end cap 50. Exemplarily, during the assembly process of the end cap assembly 100, the base 33 is located on the lower surface of the lower plastic 60, and the sealing ring 40 is sleeved on the outer periphery of the pole body 32 from the end cap 31 to the base 33. The pole body 32 and the end cap 31 pass through the second through hole 61 of the lower plastic 60 and the first through hole 51 of the end cap 50 in turn, and then the assembled end cap 50 semi-finished product is placed in the injection mold for fixing, and the upper plastic 70 is injected. The injection molding liquid can flow into the gap between the end cap 50, the sealing ring 40 and the pole 30 to seal and fill. After the injection molding is completed, the upper plastic 70 in the end cap assembly 100 includes a first part 71, a second part 72 and a third part 73 connected. The first portion 71 wraps around the side wall and part of the upper surface of the end cover 50 close to the pole body 32, and the second portion 72 is located in the gap between the side wall of the end cover 50 and the side wall of the pole body 32 ( Figure 7 The third portion 73 is located below the end cover 50 close to the pole body 32 , and the third portion 73 is located in the gap between the sealing ring body 41 and the pole body 32 .

[0066] Exemplarily, the injection liquid can be filled into the groove 34 provided on the side wall of the end cap 31 to increase the contact area between the first portion 71 and the end cap 31, so that the upper plastic 70 is tightly connected to the end cap 31, and the connection reliability between the upper plastic 70 and the pole 30 is ensured. Further, the upper surface of the first portion 71 can be flush with the upper surface of the end cap 31, but lower than the welding step 35 of the end cap 31, when the welding step 35 of the end cap 31 is welded with an external component, the influence on the connection position of the upper plastic 70 and the pole body 32 can be reduced.

[0067] It is understandable that when the upper plastic 70 is injected, one end portion of the end cap 50 is pressed against the upper surface of the sealing ring body 41, forming a certain abutting force on the sealing ring 40, and the injection liquid flows into the gap between the side wall surface of the end cap 50 and the side wall surface of the pole body 32, thereby achieving a tight connection between the end cap 50, the upper plastic 70, and the pole 30. Of course, a reinforcement structure (such as a shallow groove or a rough surface, etc., not shown in the figure) can also be further provided on the side wall surface of the end cap 50 and the side wall surface of the pole body 32 to increase the contact area with the upper plastic 70 and improve the connection strength. The injection liquid continues to flow to the gap between the sealing ring body 41 and the pole body 32 below the end cap 50. After the injection molding is completed, the lower surface of the third part 73 of the upper plastic 70 contacts the upper surface of the base 33, and one end of the side wall surface of the third part 73 of the upper plastic 70 is connected to the side wall surface of the pole 30, and the other end is connected to the inner ring surface of the sealing ring body 41 and the side wall surface of the first limiting structure 42. After the injection molding, the upper plastic 70 abuts against the end cap 50, the sealing ring 40 and the pole 30 at the same time, so that the sealing ring 40 and the pole 30 cooperate more closely and reliably, so as to fully reduce the misalignment and rollover of the sealing ring 40 during assembly, ensure the sealing effect of the sealing ring 40, reduce the leakage of the end cap assembly 100, and ensure the safety performance of the battery 200.

[0068] The specific structure of the sealing ring 40 will be described below through several different embodiments.

[0069] First embodiment:

[0070] See also Fig.10 , Fig.10 This is a schematic structural diagram of the first sealing ring 40 provided in an embodiment of the present application.

[0071] In this embodiment, the width dimension of the bottom 45 is greater than the width dimension of the end 43. The width dimension of the bottom 45 refers to the distance between the two ends of the bottom 45 and the connection point of the sealing ring body 41. Along the bottom 45 toward the end 43, the width dimension of the first limiting structure 42 can be gradually decreasing, or it can be gradually decreasing first and then gradually increasing, or different design combinations of reducing, keeping unchanged or increasing the width dimension between the bottom 45 and the end 43, but always ensuring that the width dimension of the bottom 45 is greater than the width dimension of the end 43. In short, the width dimension of the bottom 45 is greater than the width dimension of the end 43. Exemplarily, along the bottom 45 toward the end 43, the width dimension of the first limiting structure 42 gradually decreases. Through the structural design in which the end 43 is narrow and the bottom 45 is wide, on the one hand, the contact area between the end 43 and the injection mold of the sealing ring 40 can be reduced, which is convenient for separating the end 43 from the injection mold after injection molding; on the other hand, it can also avoid the bottom 45 and the sealing ring body 41 being pulled and broken during the demolding process, thereby ensuring the connection strength between the bottom 45 and the sealing ring body 41 and the molding yield rate of the first limiting structure 42.

[0072] The end 43 is also provided with a first fillet 43a, that is, the side wall surface of the end 43 is an arc surface 43b, and the radius of the circle where the first fillet 43a is located is 0.2mm-1mm, and the bottom 45 is provided with a second fillet 45a, that is, the connection between the first limiting structure 42 and the sealing ring body 41 is an arc transition surface, and the radius of the circle where the second fillet 45a is located is 0.2mm-1mm. By setting the first fillet 43a and the second fillet 45a, the injection liquid can smoothly transition between the end 43 and the bottom 45 during the injection molding of the sealing ring 40, so that the expected design of the first limiting structure 42 shape is obtained by injection molding, and the occurrence of glue shortage and flashing of the end 43 and the bottom 45 is reduced, so as to ensure the assembly degree and sealing performance of the sealing ring 40 and other components.

[0073] There are six first limiting structures 42 , which are arranged on one side of the sealing ring body 41 facing the axis of the sealing ring 40 , and are evenly spaced along the circumference of the sealing ring body 41 .

[0074] Second embodiment:

[0075] See also Fig.11 , Fig.11 This is a schematic structural diagram of a second sealing ring 40 provided in an embodiment of the present application.

[0076] In this embodiment, the same contents as those in the first embodiment are not repeated here. The difference from the first embodiment is that the width dimension of the bottom 45 is equal to the width dimension of the end 43. Along the bottom 45 toward the end 43, the width dimension of the first limiting structure 42 may be constant, or may first gradually decrease and then gradually increase, or may be different design combinations of reducing, keeping constant or increasing the width dimension between the bottom 45 and the end 43, but it is always ensured that the width dimension of the bottom 45 is equal to the width dimension of the end 43. In short, the width dimension of the bottom 45 is equal to the width dimension of the end 43. Exemplarily, along the bottom 45 toward the end 43, the width dimension of the first limiting structure 42 first gradually decreases and then gradually increases. That is to say, the shape of the projection of the first limiting structure 42 on the base 33 of the pole 30 may be a waisted shape.

[0077] Compared with the first embodiment, in this embodiment, the width dimension of the end 43 is further set to be equal to that of the bottom 45, so that the end 43 and the bottom 45 also have a larger width dimension. When both the end 43 and the bottom 45 have a larger width dimension, it can not only ensure that the bottom 45 has a better connection strength with the sealing ring body 41, but also make the end 43 have a larger contact surface with the side wall surface of the pole 30, so as to ensure the supporting and limiting effect of the first limiting structure 42 on the pole 30, thereby improving the coaxiality of the sealing ring 40 and the pole 30. A transition area with a relatively small width is provided between the end 43 and the bottom 45, which facilitates the folding and avoiding of the first limiting structure 42 so that the sealing ring 40 can be inserted into the end cap 31 and the pole body 32. Further, the thickness of the first limiting structure 42 is less than or equal to the thickness of the sealing ring 40. Exemplarily, the thickness of the first limiting structure 42 is less than the thickness of the sealing ring 40. That is to say, the first limiting structure 42 is arranged on the side of the sealing ring body 41 facing the axis of the sealing ring 40, and the first limiting structure 42 is located between the two planes where the upper surface and the lower surface of the sealing ring 40 are located. Exemplarily, in the thickness direction of the sealing ring 40, the first limiting structure 42 can be arranged at the center position of the side wall surface of the sealing ring body 41. Because the thinner the thickness of the first limiting structure 42, the easier it is to fold. By setting the thickness of the first limiting structure 42 to be less than the thickness of the sealing ring 40, the folding resistance of the first limiting structure 42 can be further reduced while ensuring the larger width dimensions of the bottom 45 and the end 43. The first limiting structure 42 is arranged in the center in the thickness direction of the sealing ring 40, which not only makes the force of the first limiting structure 42 uniform, but also plays a fool-proof role. The sealing ring 40 and the pole 30 can be assembled without strictly distinguishing the upper and lower surfaces of the sealing ring 40, thereby improving the assembly efficiency of the sealing ring 40 and the pole 30.

[0078] A first fillet 43a is provided at both ends of the end 43, and the radius of the circle where the first fillet 43a is located is 0.2mm~1mm. Exemplarily, the radius of the circle where the first fillet 43a is located is 0.3mm. The bottom 45 is provided with a second fillet 45a, and the radius of the circle where the second fillet 45a is located is 0.2mm~1mm. Exemplarily, the radius of the circle where the second fillet 45a is located is 0.25mm. When the first fillet 43a is provided at both ends of the end 43, it not only ensures the uniformity of the injection liquid at the corner when the sealing ring 40 is injected, but also makes the end 43 and the pole body 32 have a larger contact surface, ensuring the limiting support effect of the first limiting structure 42 on the side wall of the pole body 32.

[0079] In this embodiment, the surface of the end 43 facing the pole body 32 is set as an arc surface 43b that is recessed away from the pole body 32, that is, the side wall surface of the end 43 is set as an arc surface 43b that is recessed away from the pole body 32. The radius of the arc surface 43b is r, the diameter of the pole body 32 is D, and the ratio t of the radius r of the arc surface 43b to the diameter D of the pole body 32 is: 1 / 4≤t≤3 / 4. Among them, the radius of the arc surface 43b refers to the radius of the circle where the arc surface 43b is located. When t is 1 / 4≤t≤3 / 4, the side wall surface of the end 43 and the side wall surface of the pole body 32 have a better fit, thereby increasing the supporting and limiting effect of the sealing ring 40 on the pole 30. When the radius r of the arc surface 43b is too small, so that t is less than 1 / 4, the curvature of the arc surface 43b is too large, and the contact area with the side wall of the pole body 32 is greatly reduced, and even changes from surface contact to point contact, which is not conducive to the support and limitation of the pole 30 by the first limiting structure 42; when the radius r of the arc surface 43b is too large, so that t is greater than 3 / 4, the curvature of the arc surface 43b is too small, and the fit between the arc surface 43b and the side wall of the pole body 32 is poor, and the distance between the two changes from large to small and then to large, which is also not conducive to the support and limitation of the pole 30 by the first limiting structure 42.

[0080] There are eight first limiting structures 42 , which are arranged on one side of the sealing ring body 41 facing the axis of the sealing ring 40 , and are evenly spaced along the circumference of the sealing ring body 41 .

[0081] The third embodiment:

[0082] See also Fig.12 , Fig.12 This is a schematic structural diagram of a sealing ring 40 provided in the third embodiment of the present application.

[0083] In this embodiment, the same contents as those in the first embodiment are not repeated. The difference from the first embodiment is that the width dimension of the bottom 45 is smaller than the width dimension of the end 43. Among them, the width dimension of the bottom 45 refers to the distance between the two ends of the bottom 45 and the connection between the sealing ring body 41. Along the bottom 45 toward the end 43, the width dimension of the first limiting structure 42 can be gradually increased, or it can be increased first and then decreased. In short, the width dimension of the bottom 45 is smaller than the width dimension of the end 43. Exemplarily, along the bottom 45 toward the end 43, the width dimension of the first limiting structure 42 gradually increases. When the sealing ring 40 and the pole 30 are interference fit, it is difficult to fold the first limiting structure 42 so that the sealing ring 40 can be quickly inserted into the pole 30. Since the width of the bottom is relatively small, the contact area between the bottom 45 and the sealing ring body 41 is relatively small, and the restraining force of the sealing ring body 41 on the bottom 45 is relatively small, so that the first limiting structure 42 can be folded over a larger angle range; when the bottom 45 is relatively narrow, the larger the folding angle, the greater the reaction force of the first limiting structure 42 rebounding to the initial position. Therefore, the narrow structure design of the bottom 45 can not only reduce the difficulty of the first limiting structure 42 to fold and avoid, but also improve the flexibility of the first limiting structure 42 to rebound to the initial position after folding and avoiding.

[0084] There are five first limiting structures 42 , which are arranged on one side of the sealing ring body 41 facing the axis of the sealing ring 40 , and are evenly spaced along the circumference of the sealing ring body 41 .

[0085] Fourth embodiment:

[0086] See also Fig.13 , Fig.13 This is a schematic structural diagram of a sealing ring 40 provided in the fourth embodiment of the present application.

[0087] In this embodiment, the same contents as those in the first embodiment are not repeated here. The difference from the first embodiment is that each first limiting structure 42 further includes a connecting section 44, one end of the connecting section 44 is connected to the bottom 45, the other end of the connecting section 44 is connected to the end 43, and the connecting section 44 is bent and extended between the bottom 45 and the end 43. The bending can be a single bending or multiple bending. When the connecting section 44 is bent once, the bending shape can be an arc. When the connecting section 44 is bent multiple times, the bending shape can be an S-shaped, Z-shaped, W-shaped or other shapes.

[0088] Exemplarily, the connecting section 44 is bent once between the bottom 45 and the end 43, and the bending shape is an arc. At this time, relative to the center of the sealing ring 40, the bending direction of a single connecting section 44 can be in a clockwise direction or in a counterclockwise direction. That is to say, in two adjacent first limiting structures 42, the bending directions of the two adjacent connecting sections 44 can be all in the clockwise direction, or all in the counterclockwise direction; or partly in the clockwise direction and partly in the counterclockwise direction. Exemplarily, in the bending directions of the two adjacent connecting sections 44, one is in the clockwise direction and the other is in the counterclockwise direction. By means of the structural design that the two adjacent connecting sections 44 have opposite bending directions, the first limiting structure 42 can have supporting forces on the pole body 32 in different directions, thereby improving the supporting and limiting effect on the pole 30.

[0089] There are six first limiting structures 42 , which are arranged on one side of the sealing ring body 41 facing the axis of the sealing ring 40 , and are evenly spaced along the circumference of the sealing ring body 41 .

[0090] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0091] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" refers to two or more than two, unless otherwise clearly and specifically defined.

[0092] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0093] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists, A and B exist at the same time, and B exists. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0094] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0095] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0096] Finally, it should be noted that the above implementation modes are only used to illustrate the technical solution of the present application and are not intended to limit it. Although the present application has been described in detail with reference to the above preferred implementation modes, a person of ordinary skill in the art should understand that the technical solution of the present application may be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present application.

Claims

1. A pole assembly, characterized in that: include: A pole and a sealing ring, the pole comprising a pole body, a base and an end cap, one end of the pole body being connected to the base, the other end of the pole body being connected to the end cap, the cross-sectional area of ​​the pole body being smaller than the cross-sectional area of ​​the base, the cross-sectional area of ​​the pole body being smaller than the cross-sectional area of ​​the end cap, the sealing ring being sleeved around the periphery of the pole body and located on the upper surface of the base, the sealing ring comprising a sealing ring body and a plurality of first limiting structures, the plurality of first limiting structures being arranged on a side of the sealing ring body facing the axis of the sealing ring, and the plurality of first limiting structures being arranged at intervals along the circumference of the sealing ring body.

2. The pole assembly according to claim 1, characterized in that: Each of the first limiting structures includes an end and a bottom, the bottom is connected to the sealing ring body, and the end is clearance-fitted or interference-fitted with the pole body.

3. The pole assembly according to claim 1, characterized in that: The concentricity between the sealing ring and the pole is in the range of 0 mm to 0.15 mm.

4. The pole assembly according to claim 2, characterized in that: The width of the bottom portion is greater than or equal to the width of the end portion.

5. The pole assembly according to claim 4, characterized in that: Along the direction from the bottom to the end, the width dimension of the first limiting structure first gradually decreases and then gradually increases.

6. The pole assembly according to claim 4, characterized in that: The end is provided with a first rounded corner, the radius of the circle where the first rounded corner is located is 0.2mm-1mm, and the bottom is provided with a second rounded corner, the radius of the circle where the second rounded corner is located is 0.2mm-1mm.

7. The pole assembly according to claim 2, characterized in that: The width dimension of the bottom portion is smaller than the width dimension of the end portion.

8. The pole assembly according to claim 2, characterized in that: The first limiting structure further includes a connecting section, one end of which is connected to the bottom, the other end of which is connected to the end, and the connecting section is bent and extends between the bottom and the end.

9. The pole assembly according to claim 8, characterized in that: The bending direction of the connecting section is clockwise and / or counterclockwise, and the bending directions of two adjacent connecting sections are opposite.

10. The pole assembly according to any one of claims 4, 7 and 8, characterized in that: The surface of the end portion facing the pole body is set as an arc surface concave away from the pole body, the radius of the arc surface is r, the diameter of the pole body is D, and the ratio t of the radius r of the arc surface to the diameter D of the pole body is: 1 / 4≤t≤3 / 4.

11. The pole assembly according to claim 2, characterized in that: The gap between the end and the pole body is 0.05 mm to 0.15 mm.

12. The pole assembly according to claim 1, characterized in that: The end cap further includes a second limiting structure, which is a groove surrounding the side wall surface of the end cap.

13. The pole assembly according to claim 12, characterized in that: The distance between the projection of the sealing ring body on the base and the projection of the end cap on the base is ≤0.1 mm.

14. The pole assembly according to claim 1, characterized in that: In the thickness direction of the sealing ring, the first limiting structure is arranged at a central position of the side wall surface of the sealing ring body.

15. An end cap assembly, characterized in that: The invention comprises an upper plastic, an end cover, a lower plastic and a pole assembly according to any one of claims 1 to 14, The end cover and the lower plastic are stacked. The end cover is provided with a first through hole for the pole body and the end cap to pass through, The lower plastic is provided with a second through hole for the pole body and the end cap to pass through. The sealing ring is located between the second through hole and the pole body, and the sealing ring is interference-fitted with the end cover. The base is located on the lower surface of the lower plastic, the pole body passes through the second through hole and the first through hole, and the end cap is connected to the upper plastic. The upper plastic includes a first part, a second part and a third part which are connected to each other. The first part wraps the side wall surface and a part of the upper surface of the end cover close to the pole body. The second part is located in the gap between the side wall surface of the end cover and the side wall surface of the pole body. The third part is located below the end cover close to the pole body. The third part is located in the gap between the sealing ring body and the pole body.

16. A battery, characterized in that: Comprising at least one end cap assembly as claimed in claim 15.

17. An energy storage device, characterized in that: Comprising at least one battery as claimed in claim 16.

18. An electrical equipment, characterized in that: Comprising at least one energy storage device as claimed in claim 17.

Images