Pole assembly, end cap assembly, battery, and energy storage device

Abstract

The application provides a pole assembly, an end cover assembly, a battery and an energy storage device. The pole assembly comprises a pole and a sealing ring. The pole comprises a pole body, a base and an end cap. The cross-sectional area of the pole body is smaller than that of the base and the end cap. The pole body comprises a first sub-pole body and a second sub-pole body. One end of the first sub-pole body is connected with the end cap, and the other end is connected with the second sub-pole body. The second sub-pole body is connected with the base away from the other end of the first sub-pole body. The first sub-pole body forms a first included angle with the upper surface of the base, and the first included angle is greater than 90 degrees. The sealing ring is sleeved on the periphery of the second sub-pole body and is in contact with the upper surface of the base. The sealing ring forms a second included angle with the upper surface of the base, and the second included angle is greater than 90 degrees. The inner wall surface of the sealing ring is in contact with the side wall surface of the second sub-pole body. The pole assembly provided by the application can solve the technical problem that the sealing ring is prone to misalignment in the prior art, thereby affecting the safety performance of the battery.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a terminal assembly, an end cap assembly, a battery, and an energy storage device. Background Technology

[0002] Rechargeable batteries have advantages such as high energy density, high power density, high cycle life and long storage time, and are widely used in electric vehicles, mobile devices and other fields.

[0003] The sealing ring is a crucial sealing structure in battery terminal assemblies. Existing terminals typically have grooves to increase the strength of the connection with the upper plastic. However, during the insertion of the existing sealing ring into the terminal, or during the processing and handling of the terminal assembly, or when the terminal assembly is subjected to vibration, one side of the sealing ring can easily become caught in the groove, causing misalignment. This leads to poor airtightness of the terminal assembly, resulting in battery leakage and significantly impacting battery safety. Summary of the Invention

[0004] This application provides a terminal post assembly, an end cap assembly, a battery, and an energy storage device to solve the technical problem in the prior art where the sealing ring is easily caught on one side of the groove, resulting in misalignment of the sealing ring and affecting the safety performance of the battery.

[0005] To address the above problems, in a first aspect, this application provides a pole assembly, comprising:

[0006] The electrode and sealing ring are provided. The electrode includes an electrode body, a base, and an end cap. The cross-sectional area of ​​the electrode body is smaller than that of the base, and the cross-sectional area of ​​the electrode body is smaller than that of the end cap. The electrode body includes a first sub-electrode body and a second sub-electrode body. One end of the first sub-electrode body is connected to the end cap, and the other end of the first sub-electrode body is connected to the second sub-electrode body. The other end of the second sub-electrode body, away from the first sub-electrode body, is connected to the base. The first generatrix of the second sub-electrode body forms a first angle α > 90° with the upper surface of the base. The sealing ring is fitted around the second sub-electrode body and contacts the upper surface of the base. The second generatrix of the sealing ring forms a second angle β > 90° with the upper surface of the base. The inner wall surface of the sealing ring is in contact with the side wall surface of the second sub-electrode body.

[0007] By setting the side wall of the second sub-pole post body as a conical surface inclined at a first included angle α relative to the upper surface of the base, and setting the inner wall of the sealing ring as a conical surface inclined at a second included angle β relative to the upper surface of the base, the inner wall of the sealing ring fits into the side wall of the second sub-pole post body. Compared with the pole post assembly with grooves in the prior art, the pole post assembly of this application allows the sealing ring to more easily contact the upper surface of the base along the conical surface of the second sub-pole post body when it is fitted into the pole post, avoiding the situation where the sealing ring gets stuck on the pole post body. In addition, by setting the conical surface on the second sub-pole post body, the sealing ring can be guided to move towards the base. Even when subjected to vibration, the sealing ring can be promptly reset to the upper surface of the base and then connected to the base by means of the inclined structure of the conical surface. At the same time, a tapered surface matching the second sub-terminal body is also provided on the inner wall of the sealing ring, which further increases the contact area between the sealing ring and the terminal body, ensures the sealing effect of the sealing ring, reduces the leakage of air and liquid in the end cap assembly, and ensures the safety performance of the battery.

[0008] In one possible implementation, the range of the first included angle α is 120°≤α≤160°, and the difference between the first included angle α and the second included angle β is 0°≤α-β≤10°. By setting the range of the first included angle α to 120°≤α≤160°, the offset of the sealing ring relative to the pole post in the vertical or horizontal direction can be effectively limited, and the connection effect between the sealing ring and the pole post can be guaranteed. When the first included angle α < 120°, the angle of inclination of the second pole post body relative to the first pole post body is too small, the contact area between the inner wall surface of the sealing ring and the side wall surface of the second pole post body is small, resulting in a low connection strength between the sealing ring and the second pole post body, affecting the connection effect between the sealing ring and the pole post. When the first included angle α > 160°, the side wall of the second sub-terminal body has an excessively large inclination angle compared to the side wall of the first sub-terminal body. The sealing ring has a lower difficulty in climbing the side wall of the second sub-terminal body. When the sealing ring is vibrated, it is easy for the sealing ring to move towards the first sub-terminal body along the side wall of the second sub-terminal body, affecting the contact area between the sealing ring and the upper surface of the base, affecting the connection effect between the sealing ring and the terminal, thus resulting in poor airtightness of the terminal assembly and affecting the safety performance of the battery.

[0009] Furthermore, the second included angle β is less than or equal to the first included angle α, and the difference between the first included angle α and the second included angle β is 0° ≤ α - β ≤ 10°. When the second included angle β is equal to the first included angle α, the difference between the first included angle α and the second included angle β is 0°, the conical surface of the sealing ring fits well with the conical surface of the second sub-pole body, ensuring the connection effect between the sealing ring and the second sub-pole body. When the second included angle β is less than the first included angle α, the end of the inner wall surface of the sealing ring near the base fits with the side wall surface of the second sub-pole body, and the end of the inner wall surface of the sealing ring away from the base has a certain gap with the side wall surface of the second sub-pole body. This gap is an open gap formed by the inner wall surface of the sealing ring and the side wall surface of the second sub-pole body. For example, the difference between the first included angle α and the second included angle β is less than 10°. By setting the second included angle β to be slightly smaller than the first included angle α, a certain assembly tolerance can be reserved while ensuring the contact area between the conical surface of the sealing ring and the conical surface of the second sub-terminal body. Furthermore, during subsequent plastic injection molding, the injection molding liquid can fill the gap between the sealing ring and the second sub-terminal body, further strengthening the connection between the sealing ring and the terminal.

[0010] In one possible implementation, the minimum cross-sectional width of the second sub-pole body along the axial direction of the pole body is less than or equal to the cross-sectional width of the first sub-pole body along the axial direction of the pole body. When the minimum cross-sectional width of the second sub-pole body is equal to the cross-sectional width of the first sub-pole body, the second sub-pole body is connected to the first sub-pole body, and the angle between the sidewall of the second sub-pole body and the sidewall of the first sub-pole body is an obtuse angle. When the minimum cross-sectional width of the second sub-pole body is less than the cross-sectional width of the first sub-pole body, the maximum cross-sectional width of the second sub-pole body is greater than the cross-sectional width of the first sub-pole body, the angle between the sidewall of the second sub-pole body and the lower surface of the first sub-pole body is an acute angle, and the sidewall of the second sub-pole body at the end closest to the first sub-pole body is recessed towards the axis of the pole body. The minimum cross-sectional width of the second sub-pole body is located at the connection between the second sub-pole body and the first sub-pole body. By setting the minimum cross-sectional width of the second sub-pole body to be less than or equal to the cross-sectional width of the first sub-pole body, it can be ensured that the sealing ring slides unobstructed from the side wall of the first sub-pole body to the side wall of the second sub-pole body, reducing the resistance of the sealing ring falling to the upper surface of the base and reducing the probability of the sealing ring getting stuck on the side wall of the pole body and misalignment.

[0011] In one possible implementation, the inner diameter of the sealing ring gradually increases along the direction from the sealing ring towards the base. By setting the inner diameter of the sealing ring to gradually increase, a better connection effect is ensured between the sealing ring and the side wall surface of the inclined second sub-pole body. In addition, the diameter of the sealing ring is largest at the end facing the base, making it easier for the end of the sealing ring facing the base to fall onto the upper surface of the base when the sealing ring is fitted onto the pole, thus improving the assembly efficiency of the sealing ring and the pole.

[0012] In one possible implementation, the thickness of the sealing ring is less than or equal to the height of the second sub-pole body. If the thickness of the sealing ring is greater than the height of the second sub-pole body, the sidewall of the sealing ring may be closer to the contact point of the pole body and higher than the connection point of the first and second sub-pole bodies, resulting in a large gap between the inner wall of the sealing ring and the sidewall of the second sub-pole body. Especially when the minimum cross-sectional width of the second sub-pole body is less than the cross-sectional width of the first sub-pole body, the sidewall of the second sub-pole body and the lower surface of the first sub-pole body form a transition surface with a significant inward concavity towards the pole body axis. In this case, a large gap exists between the inner wall of the sealing ring and the sidewall of the second sub-pole body, resulting in poor fit between the sealing ring and the pole body, which is detrimental to the sealing performance of the sealing ring. However, when the thickness of the sealing ring is less than or equal to the height of the second sub-pole body, a better connection effect can be ensured between the inner wall of the sealing ring and the sidewall of the second sub-pole body.

[0013] In one possible implementation, the inner diameter of the sealing ring gradually decreases and then gradually increases along the direction from the sealing ring towards the base. The inner wall surface of the sealing ring includes a first inner wall and a second inner wall connected together. The extension directions of the first inner wall and the second inner wall intersect. The first inner wall is located from the end of the side wall surface of the sealing ring away from the base to the position where the inner diameter of the sealing ring is smallest; that is, the first inner wall corresponds to the inner wall surface of the region where the inner diameter of the sealing ring gradually decreases. The second inner wall is located from the position where the inner diameter of the sealing ring is smallest to the end of the side wall surface of the sealing ring near the base; that is, the second inner wall corresponds to the inner wall surface of the region where the inner diameter of the sealing ring gradually increases. When the sealing ring is assembled with the pole body, the second inner wall fits against the side wall surface of the second sub-pole body, and the first inner wall has a certain gap with the first sub-pole body. Further, the inner diameter of the sealing ring can be symmetrically distributed along the centerline of the thickness of the sealing ring. That is, the distribution of the inner diameter of the sealing ring is the same along the direction from the sealing ring towards the base, or along the direction from the base towards the sealing ring. By setting the inner diameter of the sealing ring to be symmetrically distributed along the centerline of the sealing ring's thickness, not only can the sealing ring be subjected to uniform force, but it also serves as a foolproof method. The sealing ring and the terminal post can be assembled without distinguishing between the upper and lower surfaces of the sealing ring, thus improving the assembly efficiency of the sealing ring and the terminal post.

[0014] In one possible implementation, the thickness of the sealing ring is greater than or equal to the height of the second sub-terminal body. By setting the inner diameter of the sealing ring to gradually decrease and then gradually increase, it ensures that the sealing ring has an inner wall surface with a high degree of matching with the side wall surface of the second sub-terminal body, while also allowing for greater flexibility in the design of its thickness. The thickness of the sealing ring can be less than or equal to the height of the second sub-terminal body, or it can be greater than the height of the second sub-terminal body, as long as the thickness of the sealing ring corresponding to the area where the inner diameter of the sealing ring gradually increases is less than or equal to the height of the second sub-terminal body.

[0015] In one possible implementation, the inner wall surface of the sealing ring includes a first inner wall and a second inner wall connected together, the extension directions of the first inner wall and the second inner wall intersecting each other. The sealing ring also has an extension portion located at the connection between the first inner wall and the second inner wall. The second inner wall fits against the side wall surface of the second sub-pole body, and the extension portion abuts against the side wall surface of either the first or second sub-pole body. When the sealing ring is fitted onto the end cap, the extension portion can fold over to avoid contact with the end cap. When the sealing ring is fitted around the second sub-pole body and contacts the upper surface of the base, the extension portion can spring back to the side wall surface of either the second or first sub-pole body. By adding an extension portion to the sealing ring, the degree of misalignment between the center of the sealing ring and the center of the pole can be reduced, improving the coaxiality of the sealing ring and the pole, and further enhancing the sealing performance of the sealing ring in the end cap assembly.

[0016] In one possible implementation, the end cap further includes a limiting structure circumferentially disposed on the side wall of the end cap. By providing the limiting structure, the contact area between the end cap and other components can be increased, the connection strength between the pole and other components can be improved, and the pole can be prevented from twisting.

[0017] Secondly, this application provides an end cap assembly, including an upper plastic, an end cap, a lower plastic, and the aforementioned pole assembly. The end cap and the lower plastic are stacked together. The end cap has a first through hole for the pole body and the end cap to pass through. The lower plastic has a second through hole for the pole body and the end cap to pass through. A sealing ring is located between the second through hole and the pole body. The sealing ring is interference-fitted with the end cap. A 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. The end cap is connected to the upper plastic. The upper plastic is located in the gap between the end cap, the sealing ring, and the pole.

[0018] During injection molding, one end of the end cap presses against the upper surface of the sealing ring, creating a certain resistance force. The injection molding liquid flows into the gap between the side wall of the end cap and the side wall of the terminal block, thus achieving a tight connection between the end cap, the injection molding liquid, and the terminal block. The injection molding liquid continues to flow downwards from the end cap, along the inner wall of the sealing ring and the side wall of the second terminal block, fully filling the gap between the sealing ring and the second terminal block. After injection molding, the injection molding liquid simultaneously abuts against the end cap, the sealing ring, and the terminal block, making the fit between the sealing ring and the terminal block tighter and more reliable. This significantly reduces the possibility of misalignment of the sealing ring during assembly, ensuring the sealing effect of the sealing ring, reducing air and liquid leakage from the end cap assembly, and guaranteeing the battery's safety performance.

[0019] Thirdly, this application provides a battery including at least one of the aforementioned end cap components.

[0020] Fourthly, this application provides an energy storage device including at least one of the aforementioned batteries.

[0021] In summary, by setting the side wall surface of the second sub-pole post body as a conical surface inclined at a first included angle α relative to the upper surface of the base, and setting the inner wall surface of the sealing ring as a conical surface inclined at a second included angle β relative to the upper surface of the base, the inner wall surface of the sealing ring fits snugly against the side wall surface of the second sub-pole post body. Compared to the pole post assembly with grooves in the prior art, the pole post assembly of this application allows the sealing ring to more easily contact the upper surface of the base along the conical surface of the second sub-pole post body when it is fitted into the pole post, avoiding the situation where the sealing ring gets stuck on the pole post body. In addition, because a conical surface is provided on the second sub-pole post body, the sealing ring can be guided to move towards the base. Even when subjected to vibration, the sealing ring can be promptly reset to the upper surface of the base and then connected to the base by means of the conical surface structure. At the same time, a tapered surface matching the second sub-terminal body is also provided on the inner wall of the sealing ring, which further increases the contact area between the sealing ring and the terminal body, ensures the sealing effect of the sealing ring, reduces the leakage of air and liquid in the end cap assembly, and ensures the safety performance of the battery. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this application or the background art, the accompanying drawings used in the embodiments of this application or the background art will be described below.

[0023] Figure 1 This is a schematic diagram of the structure of the electrical equipment provided in the embodiments of this application;

[0024] Figure 2 yes Figure 1 A schematic diagram of the energy storage device in the electrical equipment shown.

[0025] Figure 3 yes Figure 2A schematic diagram of the battery structure in the energy storage device shown.

[0026] Figure 4 yes Figure 3 An exploded view of the battery shown.

[0027] Figure 5 yes Figure 3 The diagram shows the structure of the end cap assembly in the battery.

[0028] Figure 6 yes Figure 5 An exploded view of the end cap assembly shown.

[0029] Figure 7 yes Figure 5 A schematic cross-sectional view of the end cap assembly shown.

[0030] Figure 8 yes Figure 5 A schematic diagram of the pole post assembly in the end cap assembly shown;

[0031] Figure 9 yes Figure 8 An exploded view of the pole assembly shown;

[0032] Figure 10 This is a schematic diagram of the structure of a pole post provided in an embodiment of this application;

[0033] Figure 11 This is a schematic diagram of another pole piece structure provided in an embodiment of this application;

[0034] Figure 12 This is a schematic diagram of the structure of a sealing ring provided in an embodiment of this application;

[0035] Figure 13 This is a schematic diagram of another sealing ring provided in an embodiment of this application;

[0036] Figure 14 This is a schematic diagram of the structure of another sealing ring provided in an embodiment of this application;

[0037] Figure 15 This is a schematic diagram of the structure of the first type of pole post assembly provided in the embodiments of this application;

[0038] Figure 16 This is a schematic diagram of the structure of the second type of pole post assembly provided in the embodiments of this application;

[0039] Figure 17 This is a schematic diagram of the structure of the third type of pole post assembly provided in the embodiments of this application;

[0040] Figure 18 This is a schematic diagram of the structure of the fourth type of pole post assembly provided in the embodiments of this application;

[0041] Figure 19 This is a schematic diagram of the structure of the fifth type of pole assembly provided in the embodiments of this application.

[0042] Figure label:

[0043] Electrical equipment 400, equipment body 410

[0044] Energy storage device 300, casing 310,

[0045] Battery 200,

[0046] End cap assembly 100, battery cell 110, housing 120, protective film 121, adapter plate 130.

[0047] 20 pole assembly

[0048] Pole post 30, end cap 31, pole post body 32, base 33, limiting groove 34, welding step 35, first sub-pole post body 36, second sub-pole post body 37, first included angle α, first busbar L1.

[0049] Sealing ring 40, first inner wall 41, second inner wall 42, extension 43, second included angle β, second generatrix L2.

[0050] End cap 50, first through hole 51, third through hole 52, fifth through hole 53,

[0051] Lower plastic part 60, second through hole 61, fourth through hole 62, sixth through hole 63, protrusion 64.

[0052] 70g of plastic

[0053] Explosion-proof valve 80, explosion-proof valve protective plate 81. Detailed Implementation

[0054] The embodiments of this application are described below with reference to the accompanying drawings.

[0055] Embodiments of this application provide a pole assembly, an end cap assembly, a battery, an energy storage device, and an electrical device.

[0056] Please see Figure 1 , Figure 1 This is a schematic diagram of the structure of the electrical equipment 400 provided in this application embodiment. The electrical equipment 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 require electricity to meet the operational needs of the electrical equipment 400. The number of energy storage devices 300 can be one or more. When there are multiple energy storage devices 300, they can be connected in series, in parallel, or in a combination of series and parallel connections to achieve a larger capacity and power.

[0057] Among them, electrical equipment 400 can be vehicles or drones, etc. Vehicles include, but are not limited to, pure electric vehicles (PEV / BEV), hybrid electric vehicles (HEV), range-extended electric vehicles (REEV), plug-in hybrid electric vehicles (PHEV), or new energy vehicles.

[0058] Please see Figure 2 , Figure 2 yes Figure 1 The diagram shows the structure of the energy storage device 300 in the electrical equipment 400. The energy storage device 300 includes a housing 310 and multiple batteries 200. The batteries 200 are electrically connected and all located inside the housing 310, protecting them from external environmental interference. In this embodiment, one energy storage device 300 includes multiple batteries 200. The batteries 200 are arranged at intervals. The batteries 200 can be connected in series, in parallel, or a combination of both to achieve greater capacity and power.

[0059] Please see Figure 3 and Figure 4 , Figure 3 yes Figure 2 A schematic diagram of the structure of battery 200 in the middle. Figure 4 yes Figure 3 An exploded view of battery 200 is shown.

[0060] Battery 200 is a secondary battery. Examples include nickel-metal hydride batteries, nickel-cadmium batteries, lead-acid (or lead-acid) batteries, lithium-ion batteries, and polymer lithium-ion batteries. In other embodiments, the battery may also be a primary lithium-ion battery, a lithium-sulfur battery, a sodium-lithium-ion battery, a sodium-ion battery, or a magnesium-ion battery.

[0061] In this embodiment, the battery 200 is a cuboid. In other embodiments, the battery 200 may also be a cylinder or other shapes. The battery 200 includes an end cap assembly 100, a battery cell 110, an adapter piece 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 and is protected from external environmental interference by the housing 120 and the protective film 121. The adapter piece 130 enables the connection between the battery cell 110 and the end cap assembly 100.

[0062] Please see Figure 5 , Figure 6 and Figure 7 , Figure 5 yes Figure 3 The diagram shows the structure of the end cap assembly 100 in the battery 200. Figure 6 yes Figure 5 An exploded view of the end cap assembly 100 shown. Figure 7 yes Figure 5 The diagram shows a cross-sectional view of the end cap assembly 100. The end cap assembly 100 includes: a pole post assembly 20, an end cap 50, a lower plastic part 60, an upper plastic part 70, and an explosion-proof valve 80.

[0063] The number of terminal components 20 can be two, and the two terminal components 20 can be a positive terminal component and a negative terminal component, respectively. When the positive terminal component and the negative terminal component have different structures, one of them is a terminal component 20. When the positive terminal component and the negative terminal component have the same structure, both the positive terminal component and the negative terminal component are terminal components 20. In this embodiment, the positive terminal component and the negative terminal component have the same structure. The following detailed description will only take one terminal component 20 as an example. Unless otherwise specified, the following description of one terminal component 20 can be applied to the other terminal component.

[0064] Please see Figure 8 , Figure 9 , Figure 10 and Figure 11 , Figure 8 yes Figure 5 The schematic diagram of the pole assembly 20 shown is as follows. Figure 9 yes Figure 8 The exploded view of the pole assembly 20 shown is shown below. Figure 10 This is a schematic diagram of the structure of a pole post provided in an embodiment of this application. Figure 11 This is a schematic diagram of another pole structure provided in an embodiment of this application.

[0065] The pole assembly 20 includes a pole 30 and a sealing ring 40.

[0066] The pole post 30 includes a pole post body 32, a base 33, and an end cap 31. The end cap 31 and the base 33 are located at opposite ends of the pole post body 32. One end of the pole post body 32 is connected to the base 33, and the other end of the pole post body 32 is connected to the end cap 31. The cross-sectional area of ​​the pole post body 32 is smaller than that of the base 33, and the cross-sectional area of ​​the pole post body 32 is smaller than that of the end cap 31. That is, the projection of the pole post body 32 onto the base 33 falls within the base 33, and the projection of the pole post body 32 onto 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 that of the base 33. The aforementioned cross-sectional area is the cross-sectional area obtained along a plane parallel to the plane containing the base 33. Exemplarily, the cross-sectional area of ​​the end cap 31 is smaller than that of the base 33. In this embodiment, the height of the base 33 and the end cap 31 is less than the height of the pole post body 32. By setting the height of the base 33 and the end cap 31 to be less than the height of the pole body 32, the space occupied by the base 33 in the end cap assembly 100 can be reduced, thereby increasing the volumetric energy density of the battery 200.

[0067] A limiting structure is provided around the side wall of the end cap 31. The limiting structure can be a limiting protrusion or a limiting groove. For example, the limiting structure is a limiting groove 34. By providing the limiting structure, the contact area between the end cap 31 and other components can be increased, the connection strength between the pole post 30 and other components can be improved, and the pole post 30 can be prevented from twisting. A welding step 35 is also provided at the end of the end cap 31 away from the base 33. By providing the welding step 35, it is easier for the welding fixture to fix the pole post 30, reducing the impact force on the pole post 30 during welding, which affects the structural reliability of the pole post 30 and the assembly strength of the end cap assembly 100.

[0068] The pole body 32 includes a first sub-pole body 36 and a second sub-pole body 37. One end of the first sub-pole body 36 is connected to the end cap 31, and the other end of the first sub-pole body 36 is connected to the second sub-pole body 37. The other end of the second sub-pole body 37, away from the first sub-pole body 36, is connected to the base 33. The first angle α formed between the first generatrix L1 of the second sub-pole body 37 and the upper surface of the base 33 is greater than 90°. That is, by rotating the plane containing the upper surface of the base 33 clockwise around the connection point of the base 33 and the second sub-pole body 37 by the first angle α, it can coincide with the plane containing the first generatrix L1 of the second sub-pole body 37. The conical surface obtained by rotating the first generatrix L1 around the axis of the second sub-pole body 37 is the side wall surface of the second sub-pole body 37. The axis of the second sub-pole body 37 is perpendicular to the plane containing the base 33, and the side wall surface of the second sub-pole body 37 is inclined relative to the base 33. For example, the range of the first included angle α is 120°≤α≤160°.

[0069] like Figure 10 and Figure 11As shown in the embodiment of this application, along the direction from the pole body 32 toward the base 33, the cross-sectional width of the second sub-pole body 37 gradually increases along the axial direction of the pole body 32. The longitudinal cross-section of the second sub-pole body 37 along the axial direction of the pole body 32 is perpendicular to the plane containing the base 33. At the connection between the second sub-pole body 37 and the first sub-pole body 36, the cross-sectional width of the first sub-pole body 36 is W1, and the cross-sectional width of the second sub-pole body 37 is W2. The minimum cross-sectional width of the second sub-pole body 37 along the axial direction of the pole body 32 is located at the connection between the second sub-pole body 37 and the first sub-pole body 36, that is, the minimum cross-sectional width of the second sub-pole body 37 is also W2.

[0070] The minimum cross-sectional width W2 of the second sub-pole body 37 along the axial direction of the pole body 32 is less than or equal to the cross-sectional width W1 of the first sub-pole body 36 along the axial direction of the pole body 32. By setting the minimum cross-sectional width W2 of the second sub-pole body 37 to be less than or equal to the cross-sectional width W1 of the first sub-pole body 36, it can be ensured that the sealing ring 40 slides unobstructed from the side wall of the first sub-pole body 36 to the side wall of the second sub-pole body 37, reducing the resistance of the sealing ring 40 falling to the upper surface of the base 33, and reducing the probability of the sealing ring 40 getting stuck on the side wall of the pole body 32 and misalignment.

[0071] For one possible implementation, please refer to Figure 10 The minimum cross-sectional width W2 of the second sub-pole body 37 along the axial direction of the pole body 32 is equal to the cross-sectional width W1 of the first sub-pole body 36 along the axial direction of the pole body 32. The second sub-pole body 37 is connected to the first sub-pole body 36. The angle between the side wall of the second sub-pole body 37 and the side wall of the first sub-pole body 36 is an obtuse angle.

[0072] For another possible implementation, please refer to Figure 11 The minimum cross-sectional width W2 of the second sub-pole body 37 along the axial direction of the pole body 32 is less than the cross-sectional width W1 of the first sub-pole body 36 along the axial direction of the pole body 32. The angle between the side wall of the second sub-pole body 37 and the lower surface of the first sub-pole body 36 is an acute angle. The side wall of the second sub-pole body 37 at the end near the first sub-pole body 36 is recessed toward the axis of the pole body 32.

[0073] The sealing ring 40 is fitted around the second sub-pole body 37 and contacts 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 second included angle β formed by the second generatrix L2 of the sealing ring 40 and the upper surface of the base 33 is greater than 90°. That is, by rotating the plane containing the upper surface of the base 33 clockwise, with the connection point between the base 33 and the sealing ring 40 as the fulcrum, it can coincide with the plane containing the second generatrix L2 of the sealing ring 40. The conical surface obtained by rotating the second generatrix L2 around the axis of the sealing ring 40 is the inner wall surface of the sealing ring 40. The axis of the sealing ring 40 is perpendicular to the plane containing the base 33, and the inner wall surface of the sealing ring 40 is inclined relative to the base 33.

[0074] By setting the side wall surface of the second sub-pole post body 37 as a conical surface inclined at a first included angle α relative to the upper surface of the base 33, and setting the inner wall surface of the sealing ring 40 as a conical surface inclined at a second included angle β relative to the upper surface of the base 33, the inner wall surface of the sealing ring 40 fits against the side wall surface of the second sub-pole post body 37. Compared with the pole post assembly with grooves in the prior art, the pole post assembly 20 provided in this application embodiment allows the sealing ring 40 to more easily contact the upper surface of the base 33 along the conical surface of the second sub-pole post body 37 when the sealing ring 40 is fitted into the pole post 30, avoiding the situation where the sealing ring 40 gets stuck on the pole post body 32. In addition, by setting the conical surface on the second sub-pole post body 37, the sealing ring 40 can be guided to move towards the base 33. Even when subjected to vibration, the sealing ring 40 can be promptly reset to the upper surface of the base 33 by means of the inclined structure of the conical surface, and then connected to the base 33. At the same time, a tapered surface matching the second sub-terminal body 37 is also provided on the inner wall surface of the sealing ring 40, which further increases the contact area between the sealing ring 40 and the terminal body 32, ensures the sealing effect of the sealing ring 40, reduces the leakage of air and liquid in the end cap assembly 100, and ensures the safety performance of the battery 200.

[0075] Furthermore, setting the range of the first included angle α to 120°≤α≤160° can effectively limit the vertical or horizontal offset of the sealing ring 40 relative to the pole post 30, and ensure the connection effect between the sealing ring 40 and the pole post 30. When the first included angle α<120°, the inclination angle of the side wall surface of the second pole post body 37 relative to the side wall surface of the first pole post body 36 is too small, and the contact area between the inner wall surface of the sealing ring 40 and the side wall surface of the second pole post body 37 is small, resulting in a lower connection strength between the sealing ring 40 and the second pole post body 37, which affects the connection effect between the sealing ring 40 and the pole post 30. When the first included angle α > 160°, the side wall of the second sub-terminal body 37 is tilted at an excessively large angle compared to the side wall of the first sub-terminal body 36. The sealing ring 40 has a lower difficulty in climbing the side wall of the second sub-terminal body 37. When the sealing ring 40 is subjected to vibration, it is easy for the sealing ring 40 to move along the side wall of the second sub-terminal body 37 toward the first sub-terminal body 36, affecting the contact area between the sealing ring 40 and the upper surface of the base 33, and affecting the connection effect between the sealing ring 40 and the terminal 30. This results in poor airtightness of the terminal assembly 20 and affects the safety performance of the battery 200.

[0076] In the embodiments of this application, the second included angle β is less than or equal to the first included angle α. That is, the range of the second included angle β can be less than or equal to 120° to 160°. If the second included angle β is greater than the first included angle α, the inclination angle between the inner wall surface of the sealing ring 40 and the second sub-pole body 37 is different. The end of the inner wall surface of the sealing ring 40 away from the base 33 rests against the side wall surface of the second sub-pole body 37, but there is a large gap below the end of the inner wall surface of the sealing ring 40 away from the base 33. This gap is a closed gap formed by the inner wall surface of the sealing ring 40, the upper surface of the base 33, and the inner wall surface of the second sub-pole body 37. Therefore, the setting that the second included angle β is greater than the first included angle α will have an adverse effect on the sealing performance of the sealing ring 40.

[0077] In the embodiments of this application, the second included angle β can be equal to the first included angle α, or the second included angle β can be less than the first included angle α. The difference between the first included angle α and the second included angle β is 0°≤α-β≤10°. When the second included angle β is equal to the first included angle α, the difference between the second included angle β and the first included angle α is 0°, and the conical surface of the sealing ring 40 fits well with the conical surface of the second sub-pole body 37, ensuring the connection effect between the sealing ring 40 and the second sub-pole body 37. When the second included angle β is less than the first included angle α, the end of the inner wall surface of the sealing ring 40 near the base 33 fits with the side wall surface of the second sub-pole body 37, and the end of the inner wall surface of the sealing ring 40 away from the base 33 has a certain gap with the side wall surface of the second sub-pole body 37. Here, the gap is an open gap formed by the inner wall surface of the sealing ring 40 and the side wall surface of the second sub-pole body 37. Exemplarily, the difference between the second included angle β and the first included angle α is less than 10°. By setting the second included angle β to be slightly smaller than the first included angle α, a certain assembly tolerance can be reserved while ensuring the contact area between the conical surface of the sealing ring 40 and the conical surface of the second sub-terminal body 37. Furthermore, during subsequent injection molding of the plastic 70, the injection molding liquid can fill the gap between the sealing ring 40 and the second sub-terminal body 37, further strengthening the connection between the sealing ring 40 and the terminal 30.

[0078] Please see Figure 12 , Figure 13 and Figure 14 , Figure 11 , Figure 12 and Figure 13 The diagram below shows the structure of the sealing ring 40 provided in the embodiments of this application under different implementations, along line AA.

[0079] For one possible implementation, please refer to Figure 12 Along the direction of the sealing ring 40 toward the base 33, the inner diameter of the sealing ring 40 gradually increases. The inner diameter of the sealing ring 40 refers to the cross-sectional width of the sealing ring 40 along its axial direction. This embodiment only describes one possible structure of the sealing ring 40 and is not limited to the case where the inner shape of the sealing ring 40 is circular. In other embodiments, the shape of the sealing ring 40 can also be elliptical or other shapes. By setting the inner diameter of the sealing ring 40 to gradually increase, a better connection effect is ensured between the sealing ring 40 and the side wall surface of the inclined second sub-pole body 37. Furthermore, the diameter of the sealing ring 40 is largest at the end facing the base 33. When the sealing ring 40 is fitted onto the pole 30, the end of the sealing ring 40 facing the base 33 falls more easily onto the upper surface of the base 33, improving the assembly efficiency of the sealing ring 40 and the pole 30.

[0080] Furthermore, the thickness of the sealing ring 40 is less than or equal to the height of the second sub-pole body 37. If the thickness of the sealing ring 40 is greater than the height of the second sub-pole body 37, the side wall of the sealing ring 40 may be closer to the contact point of the pole body 32 and higher than the connection point of the first sub-pole body 36 and the second sub-pole body 37, resulting in a large gap between the inner wall of the sealing ring 40 and the side wall of the second sub-pole body 37. Especially when the minimum cross-sectional width W2 of the second sub-pole body 37 is less than the cross-sectional width W1 of the first sub-pole body 36, the side wall of the second sub-pole body 37 and the lower surface of the first sub-pole body 36 form a transition surface with a large inward concavity towards the axis of the pole body 32. At this time, there is a large gap between the inner wall of the sealing ring 40 and the side wall of the second sub-pole body 37, resulting in poor fit between the sealing ring 40 and the pole body 32, which is not conducive to the sealing performance of the sealing ring 40. When the thickness of the sealing ring 40 is less than or equal to the height of the second sub-pole body 37, a good connection effect can be ensured between the inner wall surface of the sealing ring 40 and the side wall surface of the second sub-pole body 37.

[0081] For another possible implementation, please refer to Figure 13 Along the direction from the sealing ring 40 towards the base 33, the inner diameter of the sealing ring 40 gradually decreases and then gradually increases. The inner wall surface of the sealing ring 40 includes a connected first inner wall 41 and a second inner wall 42, the extension directions of the first inner wall 41 and the second inner wall 42 intersect. The first inner wall 41 is located from the end of the side wall surface of the sealing ring 40 away from the base 33 to the position where the inner diameter of the sealing ring 40 is the smallest, that is, the first inner wall 41 is the inner wall surface corresponding to the region where the inner diameter of the sealing ring 40 gradually decreases. The second inner wall 42 is located from the position where the inner diameter of the sealing ring 40 is the smallest to the end of the side wall surface of the sealing ring 40 near the base 33, that is, the second inner wall 42 is the inner wall surface corresponding to the region where the inner diameter of the sealing ring 40 gradually increases. When the sealing ring 40 is assembled with the pole body 32, the second inner wall 42 fits against the side wall surface of the second sub-pole body 37, and the first inner wall 41 has a certain gap with the first sub-pole body 36. By setting the inner diameter of the sealing ring 40 to gradually decrease and then gradually increase, it ensures that the sealing ring 40 has an inner wall surface with a high degree of matching with the side wall surface of the second sub-terminal body 37, while also making the design of the thickness of the sealing ring 40 more flexible. The thickness of the sealing ring 40 can be less than or equal to the height of the second sub-terminal body 37, or it can be greater than the height of the second sub-terminal body 37, as long as the thickness of the sealing ring 40 corresponding to the area where the inner diameter of the sealing ring 40 gradually increases is less than or equal to the height of the second sub-terminal body 37. The thickness of the sealing ring 40 corresponding to the area where the inner diameter of the sealing ring 40 gradually increases is the same as the thickness of the second inner wall 42.

[0082] Furthermore, the inner diameter of the sealing ring 40 can be symmetrically distributed along the centerline of the thickness of the sealing ring 40. That is, the distribution of the inner diameter of the sealing ring 40 changes the same along the direction from the sealing ring 40 toward the base 33, or along the direction from the base 33 toward the sealing ring 40. By setting the inner diameter of the sealing ring 40 to be symmetrically distributed along the centerline of the thickness of the sealing ring 40, in addition to ensuring uniform force on the sealing ring 40, it also serves as a foolproof method. The sealing ring 40 can be assembled with the pole post 30 without distinguishing between the upper and lower surfaces of the sealing ring 40, thus improving the assembly efficiency of the sealing ring 40 and the pole post 30.

[0083] For another possible implementation, please refer to Figure 14 The inner wall surface of the sealing ring 40 is also provided with an extension 43. When the sealing ring 40 is fitted into the end cap 31, the extension 43 can be folded to avoid the end cap 31. When the sealing ring 40 is fitted around the second sub-pole body 37 and contacts the upper surface of the base 33, the extension 43 can spring back to the side wall surface of the second sub-pole body 37 or the first sub-pole body 36. By adding an extension 43 to the sealing ring 40, the degree of misalignment between the center of the sealing ring 40 and the center of the pole 30 can be reduced, the coaxiality between the sealing ring 40 and the pole 30 can be improved, and the sealing performance of the sealing ring 40 in the end cap assembly 100 can be better utilized.

[0084] When the inner diameter of the sealing ring 40 gradually increases along the direction from the sealing ring 40 toward the base 33, the extension 43 can be provided at the connection between the inner wall surface of the sealing ring 40 and the upper surface of the sealing ring 40. The upper surface of the sealing ring 40 is the surface of the sealing ring 40 facing the end cap 31. When the inner diameter of the sealing ring 40 first decreases and then increases along the direction from the sealing ring 40 toward the base 33, the extension 43 can be provided at the connection between the first inner wall 41 and the second inner wall 42. Furthermore, the distance between the end of the extension 43 away from the base 33 and the base 33 is less than the distance between the end of the first sub-pole body 36 away from the base 33 and the base 33, ensuring that the extension 43 abuts against the side wall surface of the pole body 32 without abutting against the lower surface of the end cap 31.

[0085] The end cap 50 can be square, circular, or other shapes; exemplarily, the end cap 50 is square. The end cap 50 has a first through hole 51 for the electrode body 32 of the electrode post 30 to pass through, a third through hole 52 for connecting the explosion-proof valve 80, and a fifth through hole 53 for liquid injection. The through hole area of ​​the first through hole 51 is larger than the cross-sectional area of ​​the electrode body 32 and the end cap 31, and smaller than the cross-sectional area of ​​the base 33, to restrict the electrode body 32 from moving out of the first through hole 51 along the direction of the end cap 50 away from the lower plastic 60. The cross-sectional area is the cross-sectional area obtained along a 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 plate 81 is also provided on the upper surface of the explosion-proof valve 80 to protect the explosion-proof valve 80 from external environmental interference.

[0086] The lower plastic 60 can be square, circular, or other shapes, and its shape is the same as that of the end cap 50. For example, both the lower plastic 60 and the end cap 50 are square. The lower plastic 60 and the end cap 50 are stacked. The lower plastic 60 has a second through hole 61 for the electrode post 30 body 32 to pass through, a fourth through hole 62 connecting to the third through hole 52, and a sixth through hole 63 connecting 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 electrode post body 32 and the end cap 31, and smaller than the cross-sectional area of ​​the base 33, to restrict the electrode post body 32 from moving out of the second through hole 61 along the direction of the lower plastic 60 toward the end cap 50. The cross-sectional area is the cross-sectional area obtained along a plane parallel to the base 33.

[0087] Furthermore, the connection between the lower plastic 60 and the end cap 50 can be enhanced by a reinforcing structure. The reinforcing structure can be a mating structure of a protrusion and a recess. The recess / protrusion 64 is located on the side of the lower plastic facing the end cap, and the protrusion 64 / recess is located on the side of the end cap facing the lower plastic. For example, the lower plastic 60 has a protrusion 64, and correspondingly, the end cap 50 has a mating recess (not shown in the figure). The protrusion 64 and the recess cooperate to enhance the connection between the lower plastic 60 and the end cap 50.

[0088] The upper plastic 70 is used to fill the gap between the end cap 50, the sealing ring 40, and the electrode post 30, serving to position and fix the electrode post 30, while ensuring the insulation performance between the electrode post 30 and the end cap 50. Exemplarily, during the assembly 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 fitted around the electrode post body 32 from the end cap 31 towards the base 33. The electrode post body 32 and the end cap 31 pass sequentially through the second through hole 61 of the lower plastic 60 and the first through hole 51 of the end cap 50. Then, the assembled semi-finished end cap 50 is placed into the injection mold for fixation, and the upper plastic 70 is injected. The injection molding liquid can flow into and seal the gap between the end cap 50, the sealing ring 40, and the electrode post 30.

[0089] For example, the injection molding liquid can be filled into the limiting groove 34 provided on the side wall of the end cap 31 to increase the contact area between the upper plastic 70 and the end cap 31, so that the upper plastic 70 and the end cap 31 are tightly connected, ensuring the reliability of the connection between the upper plastic 70 and the pole post 30. Furthermore, the upper surface of the upper plastic 70 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 to an external component, the impact on the connection position of the upper plastic 70 and the pole post body 32 can be reduced.

[0090] Understandably, during injection molding of the upper plastic 70, one end of the end cap 50 presses against the upper surface of the sealing ring 40, creating a certain resistance force on the sealing ring 40. The injection molding liquid flows into the gap between the side wall of the end cap 50 and the side wall 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, further reinforcing structures (such as shallow limiting grooves or rough surfaces, not shown in the figure) can be provided on the side wall of the end cap 50 and the side wall of the pole body 32 to increase the contact area with the upper plastic 70 and improve the connection strength. The injection molding liquid continues to flow downwards from the end cap 50, along the inner wall of the sealing ring 40 and the side wall of the second pole body 37, fully filling the gap between the sealing ring 40 and the second pole body 37. After injection molding, the upper plastic 70 abuts against the end cap 50, the sealing ring 40, and the terminal post 30 simultaneously, making the sealing ring 40 and the terminal post 30 fit more tightly and reliably, so as to fully reduce the misalignment of the sealing ring 40 during assembly, ensure the sealing effect of the sealing ring 40, reduce the leakage of air and liquid in the end cap assembly 100, and ensure the safety performance of the battery 200.

[0091] The pole post 30 and sealing ring 40 provided in the embodiments of this application, through arrangement and combination to form different pole post assemblies 20, are all within the scope of protection claimed in this application. The specific structure of the pole post assembly 20 is described below by listing only a few different embodiments.

[0092] First embodiment:

[0093] Please see Figure 15 , Figure 15 This is a schematic diagram of the structure of the first type of pole assembly 20 provided in the embodiments of this application.

[0094] In this embodiment, the second sub-terminal body 37 is connected to the first sub-terminal body 36. Along the direction from the terminal body 32 toward the base 33, the cross-sectional width of the second sub-terminal body 37 gradually increases. The minimum cross-sectional width W2 of the second sub-terminal body 37 along the axial direction of the terminal body 32 is equal to the cross-sectional width W1 of the second sub-terminal body 37 along the axial direction of the terminal body 32, and the angle formed between the sidewall of the second sub-terminal body 37 and the sidewall of the first sub-terminal body 36 is an obtuse angle. Along the direction from the sealing ring 40 toward the base 33, the inner diameter of the sealing ring 40 gradually increases, and the thickness of the sealing ring 40 is less than or equal to the height of the second sub-terminal body 37. If the thickness of the sealing ring 40 is greater than the height of the second sub-terminal body 37, the side wall of the sealing ring 40 may be closer to the contact point of the terminal body 32 and higher than the connection point of the first sub-terminal body 36 and the second sub-terminal body 37. This results in a large gap between the inner wall of the sealing ring 40 and the side wall of the second sub-terminal body 37, leading to poor fit between the sealing ring 40 and the terminal body 32, which is detrimental to the sealing performance of the sealing ring 40. However, when the thickness of the sealing ring 40 is less than or equal to the height of the second sub-terminal body 37, a better connection between the inner wall of the sealing ring 40 and the inner wall of the second sub-terminal body 37 can be ensured. For example, the thickness of the sealing ring 40 is equal to the height of the first sub-terminal body 36.

[0095] Second embodiment:

[0096] Please see Figure 16 , Figure 16 This is a schematic diagram of the structure of the second type of pole assembly 20 provided in the embodiments of this application.

[0097] In this embodiment, the contents that are the same as those in the first embodiment will not be repeated. The difference from the first embodiment is that, along the direction of the sealing ring 40 toward the base 33, the inner diameter of the sealing ring 40 gradually decreases and then gradually increases.

[0098] Compared to the first embodiment, the thickness of the sealing ring 40 can be less than or equal to the height of the second sub-terminal body 37, or it can be greater than the height of the second sub-terminal body 37. For example, the thickness of the sealing ring 40 is greater than the height of the second sub-terminal body 37. The smallest inner diameter of the sealing ring 40 is located at the connection between the second sub-terminal body 37 and the first sub-terminal body 36. The second inner wall 42 of the sealing ring 40 is in contact with the side wall of the second sub-terminal body 37, and the first inner wall 41 of the sealing ring 40 has a certain gap with the first sub-terminal body 36. Compared to the first embodiment, the area of ​​the inner wall surface of the sealing ring 40 is increased. During subsequent injection molding of the plastic 70, the injection liquid can fill the gap between the second inner wall 42 and the first sub-terminal body 36, thereby enhancing the connection effect between the sealing ring 40 and the terminal 30.

[0099] Furthermore, the inner diameter of the sealing ring 40 can be symmetrically distributed along the centerline of the thickness of the sealing ring 40. That is, the distribution of the inner diameter of the sealing ring 40 changes the same along the direction from the sealing ring 40 toward the base 33, or along the direction from the base 33 toward the sealing ring 40. By setting the inner diameter of the sealing ring 40 to be symmetrically distributed along the centerline of the thickness of the sealing ring 40, in addition to ensuring uniform force on the sealing ring 40, it also serves as a foolproof method. The sealing ring 40 can be assembled with the pole post 30 without distinguishing between the upper and lower surfaces of the sealing ring 40, thus improving the assembly efficiency of the sealing ring 40 and the pole post 30.

[0100] Third embodiment:

[0101] Please see Figure 17 , Figure 17 This is a schematic diagram of the structure of the third pole assembly 20 provided in the embodiments of this application.

[0102] In this embodiment, the contents that are the same as those in the second embodiment will not be repeated. The difference from the second embodiment is that the minimum cross-sectional width W2 of the second sub-pole body 37 along the axial direction of the pole body 32 is less than the cross-sectional width W1 of the first sub-pole body 36 along the axial direction of the pole body 32.

[0103] The maximum cross-sectional width of the second sub-terminal body 37 is greater than the cross-sectional width of the first sub-terminal body 36, and the upper surface of the second sub-terminal body 37 is smaller than the lower surface of the first sub-terminal body 36. The angle formed between the side wall of the second sub-terminal body 37 and the lower surface of the first sub-terminal body 36 is an acute angle. During subsequent injection molding of the upper plastic 70, the injection liquid can fill the area between the second inner wall 42, the lower surface of the first sub-terminal body 36, and the side wall of the second sub-terminal body 37. After injection molding, the upper plastic 70 simultaneously connects to the sealing ring 40, the first sub-terminal body 36, and the second sub-terminal body 37, enhancing the connection effect between the sealing ring 40 and the terminal 30, ensuring the sealing effect of the sealing ring 40, reducing the possibility of air and liquid leakage in the end cap assembly 100, and ensuring the safety performance of the battery 200.

[0104] Fourth embodiment:

[0105] Please see Figure 18 , Figure 18 This is a schematic diagram of the structure of the fourth type of pole assembly 20 provided in the embodiments of this application.

[0106] In this embodiment, the contents that are the same as those in the second embodiment will not be repeated. The difference from the second embodiment is that the inner wall surface of the sealing ring 40 is also provided with an extension 43.

[0107] The extension 43 is located at the junction of the first inner wall 41 and the second inner wall 42. The distance between the end of the extension 43 away from the base 33 and the base 33 is less than the distance between the end of the second sub-pole body 37 away from the base 33 and the base 33, ensuring that the extension 43 abuts against the side wall surface of the pole body 32, but does not abut against the lower surface of the end cap 31.

[0108] The thickness of the sealing ring 40 is greater than the height of the second sub-terminal body 37. When the sealing ring 40 is fitted into the end cap 31, the extension 43 can fold over to avoid the end cap 31. When the sealing ring 40 is fitted around the second sub-terminal body 37 and contacts the upper surface of the base 33, the extension 43 springs back to the side wall of the first sub-terminal body 36 and abuts against the first sub-terminal body 36. By adding the extension 43 to the sealing ring 40, the degree of misalignment between the center of the sealing ring 40 and the center of the terminal 30 can be reduced, the coaxiality of the sealing ring 40 and the terminal 30 can be improved, and the sealing performance of the sealing ring 40 in the end cap assembly 100 can be better utilized.

[0109] Fifth embodiment:

[0110] Please see Figure 19 , Figure 19 This is a schematic diagram of the structure of the pole assembly 20 provided in the fifth embodiment of this application.

[0111] In this embodiment, the contents that are the same as those in the fourth embodiment will not be repeated. The difference from the fourth embodiment is that the thickness of the sealing ring 40 is less than the height of the second sub-pole body 37.

[0112] When the sealing ring 40 is fitted into the end cap 31, the extension 43 can fold over to avoid the end cap 31. When the sealing ring 40 is fitted around the second sub-terminal body 37 and contacts the upper surface of the base 33, the extension 43 springs back to the side wall surface of the second sub-terminal body 37 and abuts against the second sub-terminal body 37. At this time, the extension 43 is equivalent to the extension of the second inner wall 42 surface of the sealing ring 40 in the direction of the side wall surface of the second sub-terminal body 37. When the thickness of the sealing ring 40 is small, the connection effect between the sealing ring 40 and the second sub-terminal body 37 can be guaranteed, and the space occupied by the sealing ring 40 in the height direction in the end cap assembly 100 can be reduced. By adding an extension 43 to the sealing ring 40, the space occupied by the sealing ring 40 in the height direction in the end cap assembly 100 can be reduced, and the degree of offset between the center of the sealing ring 40 and the center of the pole post 30 can be reduced, thereby improving the coaxiality between the sealing ring 40 and the pole post 30 and making it more conducive to the sealing performance of the sealing ring 40 in the end cap assembly 100.

[0113] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0114] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0115] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0116] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three cases: A exists, A and B exist simultaneously, and B exists. In addition, the character " / " in this document generally indicates that the related objects before and after it have an "or" relationship.

[0117] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0118] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0119] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application and are not intended to limit it. Although this application has been described in detail with reference to the above preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions to the technical solutions of this application should not depart from the spirit and scope of the technical solutions of this application.

Claims

1. An end cap assembly, characterized in that, include: The device comprises a pole, a sealing ring, and an upper plastic layer. The pole includes a pole body, a base, and an 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 pole body includes a first sub-pole body and a second sub-pole body. One end of the first sub-pole body is connected to the end cap, and the other end of the first sub-pole body is connected to the second sub-pole body. The other end of the second sub-pole body, away from the first sub-pole body, is connected to the base. The first angle α formed between the first generatrix of the second sub-pole body and the upper surface of the base is greater than 90°. The plane containing the upper surface of the base is rotated clockwise around the connection point between the base and the second sub-pole body, with the first angle α as the fulcrum. The first generatrix of the sealing ring coincides with the plane of the second sub-pole body. The sealing ring is sleeved around the second sub-pole body and contacts the upper surface of the base. The second angle β formed by the second generatrix of the sealing ring and the upper surface of the base is greater than 90°. The plane of the upper surface of the base is rotated clockwise with the connection between the base and the sealing ring as the fulcrum, and then coincides with the plane of the second generatrix of the sealing ring. The range of the first angle α is 120°≤α≤160°. The difference between the first angle α and the second angle β is 0°<α-β≤10°. The inner wall surface of the sealing ring is provided with a conical surface. The inner wall surface of the sealing ring matches the side wall surface of the second sub-pole body. The end cap is connected to the upper plastic. Part of the upper plastic is located in the gap between the sealing ring and the pole.

2. The end cap assembly according to claim 1, characterized in that, The minimum cross-sectional width of the second sub-pole body along the axial direction of the pole body is less than or equal to the cross-sectional width of the first sub-pole body along the axial direction of the pole body.

3. The end cap assembly according to claim 1, characterized in that, Along the direction from the sealing ring toward the base, the inner diameter of the sealing ring gradually increases.

4. The end cap assembly according to claim 3, characterized in that, The thickness of the sealing ring is less than or equal to the height of the second sub-pole body.

5. The end cap assembly according to claim 1, characterized in that, Along the direction from the sealing ring toward the base, the inner diameter of the sealing ring first gradually decreases and then gradually increases.

6. The end cap assembly according to claim 5, characterized in that, The thickness of the sealing ring is greater than or equal to the height of the second sub-pole body.

7. The end cap assembly according to claim 5, characterized in that, The inner wall surface of the sealing ring includes a first inner wall and a second inner wall connected together. The extension direction of the first inner wall and the extension direction of the second inner wall intersect. The sealing ring is also provided with an extension portion, which is located at the connection between the first inner wall and the second inner wall. The second inner wall is in contact with the side wall surface of the second sub-pole body, and the extension portion abuts against the side wall surface of the first sub-pole body or the side wall surface of the second sub-pole body.

8. The end cap assembly according to any one of claims 1-7, characterized in that, The device includes an end cap and a lower plastic layer, which are stacked together. The end cap has a first through hole for the electrode body and the end cap to pass through. The lower plastic layer has a second through hole for the electrode body and the end cap to pass through. A sealing ring is located between the second through hole and the electrode body, and the sealing ring is interference-fitted with the end cap. The base is located on the lower surface of the lower plastic layer. The electrode body passes through the second through hole and the first through hole. The upper plastic layer is located in the gap between the end cap, the sealing ring, and the electrode.

9. A battery, characterized in that, Includes at least one end cap assembly as described in any one of claims 1-8.

10. An energy storage device, characterized in that, It includes at least one battery as described in claim 9.

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