Top cover assembly and battery

Abstract

The utility model relates to the technical field of batteries, and discloses a top cover assembly and a battery, the top cover assembly comprises a cover body, a pole, a first positioning ring, an injection molding ring and a sealing ring, and the cover body is provided with a mounting hole; the pole is inserted into the mounting hole, and an annular bulge is arranged around the periphery of the pole; the first positioning ring is connected to the cover body and is positioned in the mounting hole; the first positioning ring is spaced from the pole and comprises a first layer and a second layer which are connected along the axial direction, and the structural strength of the second layer is greater than that of the first layer; the injection molding ring is connected between the pole and the cover body, and the annular bulge is connected to the injection molding ring; the sealing ring is sleeved on the pole, and the sealing ring is abutted between the injection molding ring and the first positioning ring along the axial direction of the pole, so that the problem of stress deformation of the cover body can be improved.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to a top cover assembly and a battery. Background Technology

[0002] As an important component of the battery, the top cover assembly needs to fix the terminals to the cover plate.

[0003] Currently, cover plates are usually made of aluminum plates or aluminum alloy plates, which have low structural strength. When the pole is subjected to axial force, the cover plate is easily deformed. Utility Model Content

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a top cover assembly that can improve the problem of cover deformation under stress.

[0005] This utility model also proposes a battery having the above-mentioned top cover assembly.

[0006] According to a first aspect embodiment of the present invention, the top cover assembly includes a cover body, an electrode post, a first positioning ring, an injection molding ring, and a sealing ring. The cover body has a mounting hole; the electrode post is inserted into the mounting hole and has an annular protrusion around its outer periphery; the first positioning ring is connected to the cover body and located within the mounting hole; the first positioning ring and the electrode post are spaced apart and include a first layer and a second layer connected axially, the structural strength of the second layer being greater than the structural strength of the first layer; the injection molding ring is connected between the electrode post and the cover body, and the annular protrusion is connected to the injection molding ring; the sealing ring is sleeved on the electrode post, and along the axial direction of the electrode post, the sealing ring abuts against the injection molding ring and the first positioning ring.

[0007] The top cover assembly according to the embodiment of this utility model has at least the following beneficial effects: the electrode post is inserted into the mounting hole of the cover body, a plastic ring is connected between the annular protrusion on the outer periphery of the electrode post and the cover body, a sealing ring is sleeved on the electrode post, and a first positioning ring is connected to the cover body. The sealing ring can seal against the injection molding ring and the first positioning ring, and the first positioning ring can support the electrode post through the sealing ring. The first positioning ring includes a first layer and a second layer connected along the axial direction. The structural strength of the second layer is greater than that of the first layer, thereby improving the overall structural strength of the first positioning ring. This helps to more stably support the electrode post when it is subjected to axial force, and improves the problem of the cover body deforming under stress when the electrode post is subjected to axial force.

[0008] According to some embodiments of this utility model, the first layer is connected to the cover and is made of the same material as the cover.

[0009] According to some embodiments of the present invention, in the direction from the outer side to the inner side of the first positioning ring, the first positioning ring includes a first annular connecting segment and a first annular bent segment connected together. The first annular connecting segment is connected to the cover body, and the first annular bent segment is spaced apart from the pole post. The sealing ring abuts between the injection molding ring and the first annular bent segment.

[0010] According to some embodiments of the present invention, along the axial direction of the pole post, the annular protrusion and the projected portion of the first positioning ring overlap.

[0011] According to some embodiments of the present invention, the top cover assembly further includes a second positioning ring opposite to the first positioning ring, the second positioning ring being connected to the cover body, and the injection molding ring being partially connected between the pole post and the second positioning ring; a first annular groove is formed between the first positioning ring and the second positioning ring, and the injection molding ring is at least partially located in the first annular groove; an annular protrusion is located in the first annular groove, along the axial direction of the pole post, and the annular protrusion abuts against the sealing ring and the injection molding ring.

[0012] According to some embodiments of the present invention, along the direction from the outer side to the inner side of the second positioning ring, the second positioning ring includes a second annular connecting section and a second annular bending section connected together, the second annular connecting section being connected to the cover body; the injection-molded ring is partially connected between the pole post and the second annular bending section, and the second annular bending section and the first positioning ring are spaced apart to form a first annular groove.

[0013] According to some embodiments of the present invention, the second positioning ring and the cover are integrally formed, or the second positioning ring and the first positioning ring have the same structure.

[0014] According to some embodiments of the present invention, the injection ring is provided with a second annular groove, and a second positioning ring is inserted into the second annular groove; and / or, the second positioning ring is provided with a flow hole, and the injection ring includes a fixing protrusion, which is inserted into the flow hole.

[0015] According to some embodiments of the present invention, the sealing ring includes a first annular segment and a second annular segment connected axially; along the axial direction of the pole post, the first annular segment abuts between the injection ring and the first positioning ring; along the radial direction of the pole post, the second annular segment abuts between the pole post and the first positioning ring.

[0016] According to some embodiments of the present invention, the pole post is an elliptical pole post; or, the pole post includes a first segment, a second segment and a third segment connected in sequence along the radial direction, wherein the outer surface of the first segment away from the second segment is an arc surface and / or the outer surface of the third segment away from the second segment is an arc surface.

[0017] The battery according to a second aspect of the present invention includes the top cover assembly of any of the above embodiments.

[0018] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0020] Figure 1 A schematic diagram of the top cover assembly provided in an embodiment of the present invention is shown;

[0021] Figure 2 It shows Figure 1 A cross-sectional exploded view of the top cover assembly;

[0022] Figure 3 It shows Figure 1 A cross-sectional structural diagram of the top cover assembly;

[0023] Figure 4 It shows Figure 3 Enlarged structural diagram at point IV;

[0024] Figure 5 A partial cross-sectional structural schematic diagram of the top cover assembly provided in another embodiment of the present invention is shown;

[0025] Figure 6 This diagram shows a partial cross-sectional view of the top cover assembly provided in another embodiment of the present invention;

[0026] Figure 7 It shows Figure 5 Another cross-sectional view of the top cover assembly.

[0027] Figure label:

[0028] Top cover assembly 100;

[0029] Cover 110; Mounting hole 111;

[0030] 130 pole post; 131 annular protrusion; 133 first section; 135 second section; 137 third section;

[0031] First positioning ring 150; first layer 151; second layer 153; first annular connecting section 155; first annular bending section 157;

[0032] Injection ring 170; second annular groove 171; fixing protrusion 173;

[0033] Sealing ring 190; First annular segment 191; Second annular segment 193;

[0034] Second positioning ring 210; third layer 211; fourth layer 213; second annular connecting section 215; second annular bending section 217; adhesive flow hole 219; first annular groove 230; axial direction Y; radial direction X. Detailed Implementation

[0035] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0036] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not 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 this utility model.

[0037] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0038] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0039] In the description of this utility model, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0040] Please see Figure 1 This application provides a battery, which can be a blade battery or other power batteries.

[0041] Batteries can be used to provide power for new energy vehicles or other electrical equipment.

[0042] The battery includes a top cover assembly 100, a battery cell, and a housing. The battery cell can be a laminated battery cell or a wound battery cell. The battery cell is placed inside the housing. The top cover assembly 100 includes a cover 110 and a terminal post 130 disposed on the cover 110. The cover 110 covers the opening of the housing, and the terminal post 130 is electrically connected to the tab of the battery cell.

[0043] In some embodiments, the top cover assembly 100 may be manufactured by overmolding.

[0044] Please see Figures 2 to 3 In some embodiments, the top cover assembly 100 further includes a first positioning ring 150, an injection ring 170, and a sealing ring 190.

[0045] The cover 110 is provided with a mounting hole 111, and the pole post 130 is inserted into the mounting hole 111.

[0046] As an example, the cover 110 is generally a plate-like structure, and the pole post 130 can be inserted into the mounting hole 111, with both ends of the pole post 130 protruding outside the mounting hole 111. One end of the pole post 130 can be used to electrically connect to the tab of the battery cell, and the other end can be used to electrically connect to the electrical equipment.

[0047] The outer periphery of the pole post 130 is provided with an annular protrusion 131. For example, the pole post 130 may include a body and an annular protrusion 131. The body may be a columnar structure, and the annular protrusion 131 may be provided around the outer periphery of the body.

[0048] The first positioning ring 150 is connected to the cover 110 and located in the mounting hole 111 to connect and fix the first positioning ring 150 and the cover 110. The first positioning member can be located in the mounting hole 111 to support the annular protrusion 131.

[0049] As an example, the first positioning ring 150 can be located inside the mounting hole 111, and the outer peripheral wall of the first positioning ring can be welded to the inner wall of the mounting hole 111, which helps to improve the connection strength between the first positioning ring 150 and the cover 110.

[0050] The spacing between the first positioning ring 150 and the pole post 130 helps to prevent electrical conduction between them.

[0051] The injection ring 170 is connected between the terminal post 130 and the cover 110. The annular protrusion 131 is connected to the injection ring 170, so that the terminal post 130 can be fixed to the cover 110 by the injection ring 170. The injection ring 170 can also separate the terminal post 130 and the cover 110, which helps to prevent electrical conduction between the terminal post 130 and the cover 110.

[0052] A sealing ring 190 is sleeved on the pole post 130. Along the axial direction Y of the pole post 130, the sealing ring 190 abuts between the injection ring 170 and the first positioning ring 150, so that the first positioning ring 150 can support the injection ring 170 along the axial direction Y through the sealing ring 190.

[0053] It should be noted that the injection ring 170 can be connected between the pole post 130 and the cover 110 in various ways.

[0054] As an example, the inner ring wall of the injection ring 170 may be provided with a first annular slot, and the annular protrusion 131 may be inserted into the first annular slot to fix the injection ring 170 and the pole post 130. The outer ring wall of the injection ring 170 may be provided with a second annular slot, and the cover 110 may be partially inserted into the second annular slot to fix the injection ring 170 and the cover 110, thereby fixing the injection ring 170 between the pole post 130 and the cover 110.

[0055] As another example, the outer ring wall of the injection ring 170 may be provided with a second annular slot, and the cover 110 may be partially inserted into the second annular slot to fix the injection ring 170 and the cover 110. Along the axial direction Y of the pole post 130, the annular protrusion 131 may abut between the sealing ring 190 and the injection ring 170, and the first positioning ring 150 may abut against the side of the sealing ring 190 opposite to the annular protrusion 131.

[0056] Understandably, in the above example, the injection ring 170 can be injection molded to cover the annular protrusion 131 and the wall of the cover 110 at the mounting hole 111, so that the annular protrusion 131 can be inserted into the first annular slot of the injection ring 170 and the cover 110 can be inserted into the second annular slot of the injection ring 170.

[0057] The first positioning ring 150 includes a first layer 151 and a second layer 153 connected along the axial direction Y (i.e., the thickness direction of the first positioning ring 150). The structural strength of the second layer 153 is greater than that of the first layer 151. Thus, the second layer 153 can improve the overall structural strength of the first positioning ring 150, which helps to support the pole post 130 more stably when it is subjected to axial force, and improves the problem of deformation of the cover 110 when the pole post 130 is subjected to axial force.

[0058] In the first positioning ring 150, the first layer 151 can be welded to the cover 110, or both the first layer 151 and the second layer 153 can be welded to the cover to connect the first positioning ring 150 to the cover 110.

[0059] Specifically, the first positioning ring 150 can withstand the thrust in the first direction, which is approximately parallel to the axial direction Y of the pole post 130, and the first direction is approximately along the injection ring 170 toward the first positioning ring 150.

[0060] As an example, the cover 110 can be made of aluminum or aluminum alloy, and the second layer 153 can be made of a metal or alloy layer with higher strength than aluminum or aluminum alloy. For example, the second layer 153 can be made of stainless steel, nickel, cobalt or other materials.

[0061] In some embodiments, the first layer 151 is connected to the cover 110 and is made of the same material as the cover 110, thereby improving the welding strength between the first layer 151 and the cover 110, reducing the welding difficulty, and helping to obtain a better weld joint between the first positioning ring 150 and the cover 110.

[0062] As an example, if the cover 110 can be made of aluminum or aluminum alloy, then the first layer 151 can be made of aluminum or aluminum alloy.

[0063] In some embodiments, the first layer 151 and the second layer 153 can be pressed together by pressing, which helps to improve the connection strength between the first layer 151 and the second layer 153.

[0064] In some embodiments, the thickness of the first layer 151 may be greater than the thickness of the second layer 153, which helps to increase the welding area between the second layer 153 and the cover 110, improve the welding strength between the first positioning ring 150 and the cover 110, and also reduce the manufacturing cost of the first positioning ring 150.

[0065] Please see Figure 2 and Figure 5 In some embodiments, along the direction from the outer side to the inner side of the first positioning ring 150, the first positioning ring 150 includes a first annular connecting segment 155 and a first annular bending segment 157 connected to each other, that is, the first annular bending segment 157 is connected to the inner ring side of the first annular connecting segment 155.

[0066] The first annular connecting segment 155 can be connected to the cover 110. For example, the outer peripheral wall of the first annular connecting segment 155 can be welded to the inner wall of the mounting hole 111.

[0067] The first annular bend 157 can be spaced apart from the pole 130, which helps to prevent electrical conduction between the pole 130 and the second annular bend 217.

[0068] The sealing ring 190 can abut against the injection ring 170 and the first annular bend 157, thereby sealing the gap between the injection ring 170 and the first annular bend 157, improving the airtightness of the battery. The first annular bend 157 can support the injection ring 170 through the sealing ring 190. In addition, the first annular bend 157 adopts a bend structure, which helps to further improve the structural strength of the first positioning ring 150, so that the terminal post 130 can withstand greater axial force, further improving the problem of stress deformation of the cover 110.

[0069] As an example, the first annular bend segment 157 may include an annular arc segment and an annular extension segment. The annular arc segment may be connected between the first annular connecting segment 155 and the annular extension segment, and the annular extension segment and the first annular connecting segment 155 may have a height difference along the axial direction Y.

[0070] In some embodiments, along the axial direction Y of the pole post 130, the projections of the annular protrusion 131 and the first positioning ring 150 can partially overlap, so that when the pole post 130 is subjected to a force in the first direction, the force can be better transmitted to the first positioning ring 150, which helps the first positioning ring 150 to support the pole post 130 more stably.

[0071] As an example, along the axial direction Y of the pole post 130, the projections of the first annular bend segment 157 and the annular protrusion 131 can partially overlap.

[0072] In some embodiments, the top cover assembly 100 may further include a second positioning ring 210 opposite to the first positioning ring 150.

[0073] The second positioning ring 210 can be connected to the cover 110 to fix the second positioning ring 210 and the cover 110.

[0074] The injection ring 170 can be partially connected between the pole post 130 and the second positioning ring 210, so that the pole post 130 and the second positioning ring 210 can be insulated by the injection ring 170, which helps to prevent electrical conduction between the pole post 130 and the second positioning ring 210.

[0075] A first annular groove 230 can be formed between the first positioning ring 150 and the second positioning ring 210. The injection ring 170 is at least partially located in the first annular groove 230, so that the first positioning ring 150 and the second positioning ring 210 can provide support and limit on both sides of the injection ring 170, which helps to reduce the possibility of the injection ring 170 falling off.

[0076] An annular protrusion 131 is located within the first annular groove 230, along the axial direction Y of the pole post 130. The annular protrusion 131 abuts against the sealing ring 190 and the injection ring 170. Thus, the sealing ring 190 can be sealed between the annular protrusion 131 and the first positioning ring 150, improving the sealing effect between them. Furthermore, the first positioning ring 150 and the second positioning ring 210 provide support on both sides of the annular protrusion 131, helping the pole post 130 to withstand greater axial forces in both the first and second directions. This further improves the deformation problem of the cover 110 under stress, contributing to a more stable overall structure of the top cover assembly 100. The first and second directions are opposite and both can be parallel to the axial direction Y of the pole post 130.

[0077] Specifically, the first positioning ring 150 can support the annular protrusion 131 along the first direction via the sealing ring 190 to withstand the force transmitted by the pole post 130 along the first direction. This helps the pole post 130 withstand greater thrust in the first direction and improves the problem of the cover 110 being easily deformed due to the force in the first direction. The second positioning ring 210 can support the annular protrusion 131 along the second direction via the injection molding ring 170 to withstand the force transmitted along the second direction. This helps the pole post 130 withstand greater thrust in the second direction and improves the problem of the cover 110 being easily deformed due to the force in the second direction.

[0078] As an example, during injection molding, the annular protrusion 131 and the sealing ring 190 can abut against each other along the axial direction Y before injection molding, so that the plastic flows into the first annular groove 230 and between the inner annular surface of the second positioning ring 210 and the pole post 130 to form the injection ring 170.

[0079] In some embodiments, along the axial direction Y of the pole post 130, the projections of the annular protrusion 131 and the second positioning ring 210 can partially overlap, so that when the pole post 130 is subjected to a force in the second direction, the force can be better transmitted to the second positioning ring 210, which helps the second positioning ring 210 to support the pole post 130 more stably, and can also improve the problem of the injection ring 170 loosening under force.

[0080] As an example, along the axial direction Y of the pole post 130, the projections of the first annular bend segment 157 and the annular protrusion 131 can partially overlap.

[0081] In some embodiments, the second positioning ring 210 and the cover 110 can be integrally formed (e.g. Figure 4 and Figure 5 As shown in the figure, this reduces the connection process between the second positioning ring 210 and the cover 110, which helps to improve the processing speed.

[0082] As an example, the second positioning ring 210 and the cover 110 can be pressed into a single integral structure, thereby reducing the welding process between the second positioning ring 210 and the cover 110.

[0083] Please see Figures 5 to 6 In some embodiments, the second positioning ring 210 and the first positioning ring 150 have the same structure (e.g., Figure 6 As shown, this helps to improve the structural strength of the second positioning ring 210, so that the pole post 130 can withstand greater thrust in both the first and second directions, which helps to further improve the problem of stress deformation of the cover 110 and improve the overall structural stability of the cover 110 assembly.

[0084] Specifically, the second positioning ring 210 includes a third layer 211 and a fourth layer 213 connected along the thickness direction (i.e., the axial direction Y). The material of the third layer 211 can be the same as that of the cover 110, and the material of the fourth layer 213 can be the same as that of the second layer 153. The beneficial effects of the third layer 211 and the fourth layer 213 can be referred to the beneficial effects of the first layer 151 and the second layer 153, and will not be repeated here.

[0085] In some embodiments, along the direction from the outer side to the inner side of the second positioning ring 210, the second positioning ring 210 may include a second annular connecting segment 215 and a second annular bending segment 217 connected together. The second annular connecting segment 215 is connected to the cover 110 to be fixed with the cover 110.

[0086] As an example, the outer peripheral wall of the second annular connecting section 215 can be welded to the inner wall of the mounting hole 111 to enhance the connection strength between the second positioning ring 210 and the cover 110.

[0087] The structures of the second annular connecting segment 215 and the second annular bending segment 217 are roughly the same as those of the first annular connecting segment 155 and the first annular bending segment 157, and will not be described in detail here.

[0088] The injection ring 170 is partially connected between the terminal post 130 and the second annular bend 217 to separate the second annular bend 217 and the terminal post 130, which helps to prevent electrical conductivity between the second annular bend 217 and the terminal post 130. For example, the injection ring 170 is partially wound between the inner annular surfaces of the terminal post 130 and the second annular bend 217.

[0089] The second annular bending section 217 and the first positioning ring 150 form a first annular groove 230 at intervals. Since the annular protrusion 131 is located in the first annular groove 230, when the pole post 130 is subjected to a force in the second direction, the second annular bending section 217 can support the annular protrusion 131 along the second direction through the injection ring 170 to bear the force transmitted by the pole post 130, which helps to improve the problem of deformation of the cover 110 under stress.

[0090] As an example, when the second positioning ring 210 and the cover 110 are integrally formed, when the pole post 130 is subjected to a force in the second direction, the second annular bending section 217 can absorb the force and deform, and the sealing ring 190 can be compressed to provide deformation space. Thus, the second annular bending section 217 can play a buffering role, which helps to reduce the force transmitted to the cover 110 and improves the problem of the cover 110 deforming under force.

[0091] As another example, when the second positioning ring 210 and the first positioning ring 150 have the same structure, that is, when the second positioning ring 210 includes a third layer 211 and a fourth layer 213, the second positioning ring 210 can have better structural strength, so the second positioning ring 210 can withstand greater force, which can also improve the problem of deformation of the cover 110.

[0092] In some embodiments, the injection ring 170 may be provided with a second annular groove 171, and a second positioning ring 210 is inserted into the second annular groove 171, so that the injection ring 170 can cover the outer periphery of the second positioning ring 210. The second positioning ring 210 can better support the injection ring 170 in the first and second directions, which helps to reduce the possibility of the injection ring 170 falling off. The second annular groove 171 can be the second annular slot in the above embodiment.

[0093] As an example, during injection molding of the injection ring 170, plastic can flow into the first annular groove 230, between the inner annular surface of the second positioning ring 210 and the pole post 130, and the surface of the second positioning ring 210 away from the first positioning ring 150, so that the plastic can cover the outer peripheral surface of the second positioning ring 210, so that the second positioning ring 210 can be inserted into the second annular groove 171 of the injection ring 170.

[0094] Please see Figure 6In some embodiments, when the second positioning ring 210 and the first positioning ring 150 have the same structure, the second positioning ring 210 and the first positioning ring 150 can be symmetrically distributed. The second layer 153 located in the first annular connecting section 155 and the fourth layer 213 located in the second annular connecting section 215 can be connected relative to each other. The first layer 151 is located on the side of the second layer 153 away from the fourth layer 213, and the third layer 211 is located on the side of the fourth layer 213 away from the second layer 153. Thus, the first positioning ring 150 and the second positioning ring 210 can support each other, which helps to withstand greater axial force.

[0095] As an example, the second layer 153 and the fourth layer 213 can be welded together, or the second layer 153 and the fourth layer 213 can be joined together.

[0096] Please see Figure 7 In some embodiments, the second positioning ring 210 may be provided with a glue flow hole 219, and the injection ring 170 may include a fixing protrusion 173. The fixing protrusion 173 may be inserted into the glue flow hole 219, which helps to improve the connection strength between the injection ring 170 and the second positioning ring 210. The fixing protrusion 173 can also restrict the movement of the injection ring 170 along the radial X.

[0097] As an example, when the injection ring 170 is injection molded, the plastic can flow into the flow hole 219 to form a fixed protrusion 173 that is inserted into the flow hole 219.

[0098] It should be noted that the number of flow holes 219 can be one or more, with "more" referring to two or more. The position of the flow holes 219 can be set according to requirements. The flow holes 219 can be blind holes or through holes.

[0099] Please see Figure 2 and Figure 4 In some embodiments, the sealing ring 190 may include a first annular segment 191 and a second annular segment 193 connected along the axial Y-axis.

[0100] Along the axial direction Y of the pole post 130, the first annular segment 191 abuts between the injection ring 170 and the first positioning ring 150, thereby sealing the gap between the injection ring 170 and the first positioning ring 150, which helps to improve the airtightness of the top cover assembly 100.

[0101] Understandably, the first annular segment 191 can also abut against the annular protrusion 131 and the first positioning ring 150 to seal the gap between the annular protrusion 131 and the first positioning ring 150, thereby improving the airtightness of the top cover assembly 100.

[0102] As an example, along the axial direction Y of the pole post 130, the outer ring side of the first annular segment 191 can abut against the injection ring 170 and the first annular bend segment 157, and the inner ring side of the first annular segment 191 can abut against the annular protrusion 131 and the first annular bend segment 157. The second annular segment 193 can be connected to the inner ring side of the first annular segment 191.

[0103] Along the radial direction X of the pole post 130, the second annular segment 193 abuts between the pole post 130 and the first positioning ring 150. Thus, the second annular segment 193 can not only seal the gap between the pole post 130 and the first positioning ring 150, but also separate the pole post 130 and the first positioning ring 150, which helps to avoid electrical conduction or high voltage breakdown between the pole post 130 and the first positioning ring 150.

[0104] In some embodiments, the terminal post 130 can be an elliptical terminal post 130, thereby allowing a terminal post 130 with a larger radial dimension to be installed within the limited area of ​​the cover 110, which helps to improve the current carrying capacity of the terminal post 130 and improve the performance of the battery.

[0105] Specifically, when the thickness of the pole post 130 along the axial direction Y is relatively thin or the thickness of the top cover assembly 100 is relatively thin, increasing the radial dimension of the pole post 130 is beneficial to improving the current-carrying capacity of the pole post 130.

[0106] Taking an elliptical pole as an example, in this embodiment of the application, the size of the pole 130 along the major axis can be increased while the minor axis size of the pole 130 remains unchanged or is reduced, so as to increase the flow cross section of the pole 130.

[0107] Please see Figures 1 to 2 In some embodiments, the terminal post 130 includes a first segment 133, a second segment 135, and a third segment 137 connected sequentially along the radial direction X. The outer surface of the first segment 133 facing away from the second segment 135 is an arc surface and / or the outer surface of the third segment 137 facing away from the second segment 135 is an arc surface. This allows the terminal post 130 with a larger radial dimension to be installed within the limited area of ​​the cover 110, which helps to improve the current carrying capacity of the terminal post 130 and improve the performance of the battery.

[0108] Specifically, when the thickness of the pole post 130 along the axial direction Y is relatively thin or the thickness of the top cover assembly 100 is relatively thin, increasing the radial dimension of the pole post 130 is beneficial to improving the current-carrying capacity of the pole post 130.

[0109] As an example, the second segment 135 can be roughly rectangular, and the first segment 133 and the third segment 137 are connected to opposite sides of the rectangular body, respectively. At least one of the first segment 133 and the third segment 137 can be a semi-cylinder.

[0110] The rectangular body can be a cuboid, and the first segment 133 and the third segment 137 can be connected to opposite sides of the cuboid along its length, thereby further increasing the volume of the pole 130 and improving its current-carrying capacity. Alternatively, the rectangular body can also be a square body.

[0111] In the top cover assembly 100 and battery provided in this application embodiment, the terminal post 130 is inserted into the mounting hole 111 of the cover body 110. A plastic ring 170 is connected between the annular protrusion 131 on the outer periphery of the terminal post 130 and the cover body 110. A sealing ring 190 is sleeved on the terminal post 130. A first positioning ring 150 is connected to the cover body 110. The sealing ring 190 can seal against the injection molding ring 170 and the first positioning ring 150. The first positioning ring 150 can support the terminal post 130 through the sealing ring 190. The first positioning ring 150 includes a first layer 151 and a second layer 153 connected along the axial direction Y. The structural strength of the second layer 153 is greater than that of the first layer 151. Therefore, the second layer 153 can improve the overall structural strength of the first positioning ring 150, which helps to support the terminal post 130 more stably when it is subjected to axial force, and improves the problem of deformation of the cover body 110 when the terminal post 130 is subjected to axial force.

[0112] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention. Furthermore, the embodiments of the present invention and the features thereof can be combined with each other unless otherwise specified.

Claims

1. A top cover assembly, characterized in that, include: The cover body is provided with mounting holes; The electrode post is inserted into the mounting hole and has an annular protrusion around its outer periphery; A first positioning ring is connected to the cover and located within the mounting hole; the first positioning ring is spaced apart from the pole post and includes a first layer and a second layer connected axially, wherein the structural strength of the second layer is greater than that of the first layer; The injection ring is connected between the pole and the cover, and the annular protrusion is connected to the injection ring; as well as A sealing ring is sleeved on the pole post and abuts against the injection ring and the first positioning ring along the axial direction of the pole post.

2. The top cover assembly according to claim 1, characterized in that, The first layer is connected to the cover and is made of the same material as the cover.

3. The top cover assembly according to claim 1, characterized in that, Along the direction from the outer side to the inner side of the first positioning ring, the first positioning ring includes a first annular connecting segment and a first annular bent segment connected together. The first annular connecting segment is connected to the cover body, and the first annular bent segment is spaced apart from the pole post. The sealing ring abuts between the injection-molded ring and the first annular bend.

4. The top cover assembly according to claim 1, characterized in that, Along the axial direction of the pole post, the annular protrusion and the projected portion of the first positioning ring overlap.

5. The top cover assembly according to claim 1, characterized in that, The top cover assembly further includes a second positioning ring opposite to the first positioning ring, the second positioning ring being connected to the cover body, and the injection-molded ring portion being connected between the pole post and the second positioning ring; A first annular groove is formed between the first positioning ring and the second positioning ring, and the injection ring is at least partially located within the first annular groove; The annular protrusion is located within the first annular groove, along the axial direction of the pole post, and abuts against the sealing ring and the injection ring.

6. The top cover assembly according to claim 5, characterized in that, Along the outer side to the inner side of the second positioning ring, the second positioning ring includes a second annular connecting segment and a second annular bending segment connected together, the second annular connecting segment being connected to the cover; the injection-molded ring is partially connected between the pole post and the second annular bending segment, the second annular bending segment and the first positioning ring being spaced apart to form the first annular groove.

7. The top cover assembly according to claim 5, characterized in that, The second positioning ring and the cover are integrally formed, or the second positioning ring and the first positioning ring have the same structure.

8. The top cover assembly according to claim 5, characterized in that, The injection ring is provided with a second annular groove, and the second positioning ring is inserted into the second annular groove; And / or, the second positioning ring is provided with a glue flow hole, and the injection ring includes a fixing protrusion that is inserted into the glue flow hole.

9. The top cover assembly according to claim 1, characterized in that, The sealing ring includes a first annular segment and a second annular segment connected axially; along the axial direction of the pole post, the first annular segment abuts between the injection ring and the first positioning ring; along the radial direction of the pole post, the second annular segment abuts between the pole post and the first positioning ring.

10. The top cover assembly according to claim 1, characterized in that, The pole is an elliptical pole; Alternatively, the pole post includes a first segment, a second segment, and a third segment connected radially in sequence, wherein the outer surface of the first segment opposite to the second segment is an arc surface and / or the outer surface of the third segment opposite to the second segment is an arc surface.

11. A battery, characterized in that, Includes the top cover assembly according to any one of claims 1 to 10.

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