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 limiting ring and an insulating ring, and the cover body is provided with a mounting hole; the pole is inserted into the mounting hole, a first annular groove is formed in the outer peripheral wall of the pole in a surrounding manner, the pole comprises an expansion section and a connection section, and the expansion section and the connection section are located on the two opposite sides of the first annular groove respectively in the axial direction of the pole; the limiting ring is arranged on the groove bottom wall of the first annular groove and the peripheral face of the expanding section in a surrounding mode. The insulating ring surrounds the peripheral surface of the limiting ring, and the cover body is connected to the insulating ring, so that the stability of the overall structure of the top cover assembly 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. An insulating plastic part is usually required between the cover plate and the terminals to separate them.

[0003] The most common processing methods for top cover components are riveting and injection molding. For top cover components manufactured by riveting, the plastic parts are prone to cracking, and the overall structure of the top cover component is not stable enough. 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 overall structural stability of the top cover assembly.

[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, a pole post, a limiting ring, and an insulating ring. The cover body has a mounting hole. The pole post is inserted into the mounting hole. The outer peripheral wall of the pole post is surrounded by a first annular groove and includes an expanded section and a connecting section. Along the axial direction of the pole post, the expanded section and the connecting section are located on opposite sides of the first annular groove. The limiting ring is surrounded by the bottom wall of the first annular groove and the outer peripheral surface of the expanded section. The insulating ring is surrounded by the outer peripheral surface of the limiting ring, and the cover body is connected to the insulating ring.

[0007] The top cover assembly according to the present invention has at least the following beneficial effects: the electrode post is inserted into the mounting hole of the cover body, the outer peripheral wall of the electrode post is surrounded by a first annular groove, and includes an expanded section and a connecting section. Along the axial direction of the electrode post, the expanded section and the connecting section are respectively located on opposite sides of the first annular groove. A limiting ring is provided around the bottom wall of the first annular groove and the outer peripheral surface of the expanded section, and an insulating ring is provided around the outer peripheral surface of the limiting ring. Thus, during the electrode post riveting process, the limiting ring can limit the radial dimension of the electrode post in the first annular groove and the expanded section, which helps to improve the problem of excessive increase in the radial dimension of the electrode post during the riveting process, causing the insulating ring to crack, and improves the overall structural stability of the top cover assembly.

[0008] 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.

[0009] According to some embodiments of the present invention, the limiting ring includes a first annular limiting segment and a second annular limiting segment connected along the axial direction. The first annular limiting segment abuts against the bottom wall of the first annular groove, and the second annular limiting segment abuts against the outer peripheral surface of the expanded segment. An insulating ring is provided around the outer peripheral surfaces of the first annular limiting segment and the second annular limiting segment.

[0010] According to some embodiments of the present invention, the limiting ring further includes a third annular limiting segment connected between the first annular limiting segment and the second annular limiting segment; along the axial direction of the pole post, the first annular groove has an annular inner wall surface, the outer peripheral surface of the expanding segment is connected to the annular inner wall surface, and the third annular limiting segment is located in the first annular groove and abuts against the annular inner wall surface.

[0011] According to some embodiments of this utility model, the projected portions of the cover and the expansion segment overlap along the axial direction of the pole post.

[0012] According to some embodiments of the present invention, the outer peripheral wall of the connecting section is surrounded by a second annular groove that communicates with the first annular groove; the insulating ring includes a connecting ring and a sealing ring, the connecting ring is surrounded on the outer periphery of the limiting ring, and the sealing ring is sleeved on the bottom wall of the second annular groove; along the axial direction of the pole post, the sealing ring abuts against the groove side wall of the connecting ring and the second annular groove, and cooperates with the connecting ring to form an annular slot, and the cover is inserted into the annular slot.

[0013] According to some embodiments of the present invention, along the axial direction of the pole post, the sealing ring also abuts against the groove sidewall of the second annular groove and the cover.

[0014] According to some embodiments of the present invention, the cover includes an annular surface and an annular protrusion, the annular surface forming a mounting hole; the annular protrusion protrudes from the annular surface and is inserted into the annular slot.

[0015] According to some embodiments of the present invention, a positioning groove is provided around the bottom wall of the first annular groove, and a limiting ring located in the first annular groove is inserted into the positioning groove.

[0016] According to a second aspect embodiment of the present invention, the battery includes the top cover assembly of any of the above embodiments.

[0017] 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

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0019] Figure 1 A schematic diagram of the top cover assembly provided in an embodiment of the present invention is shown;

[0020] Figure 2 It shows Figure 1 A cross-sectional structural diagram of the top cover assembly;

[0021] Figure 3 It shows Figure 1 An exploded view of the top cover assembly;

[0022] Figure 4 It shows Figure 2 A magnified structural diagram of point IV in the middle.

[0023] Figure label:

[0024] Top cover assembly 100;

[0025] 110 cover body; 111 mounting hole; 113 annular surface; 115 annular protrusion;

[0026] 130 pole post; 131 first annular groove; 132 annular inner wall surface; 133 expanded section; 135 connecting section; 1351 second annular groove; 137 first section; 139 second section; 141 third section; 143 positioning groove;

[0027] Limiting ring 150; First annular limiting segment 151; Second annular limiting segment 153; Third annular limiting segment 155;

[0028] Insulating ring 170; connecting ring 171; first ring segment 1711; second ring segment 1713; third ring segment 1715;

[0029] Sealing ring 173; annular slot 175; axial direction Y; radial direction X. Detailed Implementation

[0030] 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.

[0031] 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.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] Please see Figures 1 to 2 This application provides a battery, for example, a blade battery or other power batteries.

[0036] Batteries can be used to provide power for new energy vehicles or other electrical equipment.

[0037] 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.

[0038] In some embodiments, the top cover assembly 100 may be manufactured by riveting.

[0039] Please see Figures 3 to 4 In some embodiments, the top cover assembly 100 further includes a limiting ring 150 and an insulating ring 170.

[0040] The cover 110 is provided with a mounting hole 111, and the pole post 130 is inserted into the mounting hole 111.

[0041] As an example, the cover 110 is generally plate-shaped, the pole post 130 can be inserted into the mounting hole 111, and both ends of the pole post 130 can be exposed outside the mounting hole 111.

[0042] The outer peripheral wall of the pole post 130 is provided with a first annular groove 131, and includes an expansion section 133 and a connecting section 135. Along the axial direction Y of the pole post 130, the expansion section 133 and the connecting section 135 are located on opposite sides of the first annular groove 131.

[0043] As an example, the pole post 130 may include an expanded section 133, an intermediate section, and a connecting section 135 connected sequentially along the axial direction Y. The diameter of the intermediate section may be smaller than the diameters of the expanded section 133 and the connecting section 135 to form a first annular groove 131 on the outer periphery of the intermediate section. Understandably, the expanded section 133 may serve as the groove sidewall of the first annular groove 131.

[0044] The limiting ring 150 is wrapped around the bottom wall of the first annular groove 131 and the outer peripheral surface of the expanded section 133, and the insulating ring 170 is wrapped around the outer peripheral surface of the limiting ring 150. In this way, during the riveting process of the pole post 130, the limiting ring 150 can limit the radial dimension of the pole post 130 in the first annular groove 131 and the expanded section 133, which helps to improve the problem of the insulating ring 170 cracking due to excessive increase in the radial dimension of the pole post 130 during the riveting process, and improves the overall structural stability of the top cover assembly 100.

[0045] Furthermore, compared to the top cover assembly in related technologies that only has insulating components, the limiting ring 150 in this embodiment can limit the radial dimension of the expanding segment 133. The inner ring of the limiting ring 150 can be set into the required shape as needed. After riveting, the pole post 130 can be in close contact with the limiting ring 150, so that the outer peripheral surface of the expanding segment 133 and the bottom wall of the first annular groove 131 can obtain the same shape as the inner ring of the limiting ring 150. In this way, not only can a better contact surface be obtained between the pole post 130 and the limiting ring 150, but the pole post 130 of the required shape can also be obtained more flexibly.

[0046] The bottom wall of the first annular groove 131 can be a radial portion of the peripheral wall of the pole post 130.

[0047] The cover 110 is connected to the insulating ring 170, so that the pole post 130 can be fixed to the cover 110 through the insulating ring 170, and the insulating ring 170 can be located between the cover 110 and the limiting ring 150 to separate the cover 110 and the limiting ring 150 and prevent current from being transmitted to the cover 110.

[0048] In some embodiments, the structural strength of the limiting ring 150 can be greater than that of the insulating ring 170, which helps the limiting ring 150 to have sufficient structural strength to better limit the volume expansion of the pole post 130 along the radial X and reduce the possibility of the limiting ring 150 cracking.

[0049] As an example, the limiting ring 150 can be a metal ring, such as a stainless steel ring or other metal ring. It should be noted that the limiting ring 150 can also have current-carrying capacity, allowing the limiting ring 150 and the terminal post 130 to have a larger radial dimension, which helps to further improve the current-carrying capacity and enhance battery performance.

[0050] Please see Figure 1 In some embodiments, the terminal post 130 can be an elliptical terminal post, thereby allowing the installation of a terminal post 130 with a larger radial dimension 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.

[0051] 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.

[0052] 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.

[0053] In some embodiments, the terminal post 130 includes a first segment 137, a second segment 139, and a third segment 141 connected sequentially along the radial direction X. The outer surface of the first segment 137 facing away from the second segment 139 is an arc surface and / or the outer surface of the third segment 141 facing away from the second segment 139 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.

[0054] 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.

[0055] As an example, the second segment 139 can be roughly rectangular, and the first segment 137 and the third segment 141 are connected to opposite sides of the rectangular body, respectively. At least one of the first segment 137 and the third segment 141 can be a semi-cylinder.

[0056] The rectangular body can be a cuboid, and the first segment 137 and the third segment 141 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.

[0057] Please see Figures 3 to 4 In some embodiments, the projections of the cover 110 and the expansion segment 133 can partially overlap along the axial Y direction of the pole post 130, which helps to better transfer the force to the cover 110 when the pole post 130 is subjected to axial Y force, and helps to improve the situation where the limiting ring 150 and the insulating ring 170 are loosened under force.

[0058] In some embodiments, the limiting ring 150 may include a first annular limiting segment 151 and a second annular limiting segment 153 connected along the axial direction Y.

[0059] The first annular limiting segment 151 can abut against the bottom wall of the first annular groove 131, and the second annular limiting segment 153 can abut against the outer peripheral surface of the expanding segment 133. The insulating ring 170 is wrapped around the outer peripheral surfaces of the first annular limiting segment 151 and the second annular limiting segment 153. In this way, the first annular limiting segment 151 can prevent the pole post 130 from being excessively expanded at the position of the first annular groove 131, thus preventing the insulating ring 170 from cracking. The second annular limiting segment 153 can prevent the pole post 130 from being excessively expanded at the expanding segment 133, thus preventing the insulating ring 170 from cracking.

[0060] As an example, the diameter of the inner ring of the first annular limiting segment 151 can be smaller than the diameter of the inner ring of the second annular limiting segment 153. The first annular limiting segment 151 can be disposed around the bottom wall of the first annular groove 131, and the second annular limiting segment 153 can be disposed around the outer periphery of the expanding segment 133. During the riveting process of the pole post 130, the radial dimension of the intermediate segment increases, so that the outer peripheral wall of the intermediate segment (i.e., the bottom wall of the first annular groove 131) can abut against the inner ring surface of the first annular limiting segment 151. Similarly, the radial dimension of the expanding segment 133 increases, so that the outer peripheral surface of the expanding segment 133 can abut against the inner ring surface of the second annular limiting segment 153.

[0061] It should be noted that the first annular limiting segment 151 abuts against the bottom wall of the first annular groove 131. This can mean that the inner annular surface of the first annular limiting segment 151 abuts against the bottom wall of the first annular groove 131, or it can mean that the inner annular surface of the first annular limiting segment 151 is completely attached to and abuts against the bottom wall of the first annular groove 131. Similarly, the second annular limiting segment 153 abuts against the outer peripheral surface of the expanded segment 133. This can mean that the inner annular surface of the second annular limiting segment 153 abuts against the outer peripheral surface of the expanded segment 133, or it can mean that the inner annular surface of the second annular limiting segment 153 is completely attached to and abuts against the outer peripheral surface of the expanded segment 133.

[0062] In some embodiments, the limiting ring 150 may further include a third annular limiting segment 155 connected between the first annular limiting segment 151 and the second annular limiting segment 153.

[0063] Along the axial direction of the pole post 130, the first annular groove 131 has an annular inner wall surface 132, the outer peripheral surface of the expanded segment 133 is connected to the annular inner wall surface 132, and the third annular limiting segment 155 is located within the first annular groove 131 and abuts against the annular inner wall surface 132. Thus, the third annular limiting segment 155 can support the expanded segment 133 along the axial direction Y of the pole post 130, thereby supporting the pole post 130 and also contributing to a tighter connection between the limiting ring 150 and the pole post 130. Furthermore, the third annular limiting segment 155 and the second annular limiting segment 153 can cooperate to restrict the shape of the expanded segment 133, helping to better obtain the desired shape of the expanded segment 133.

[0064] Understandably, the annular inner wall surface 132 can be the wall surface inside the first annular groove 131, and at the same time, the annular inner wall surface 132 is also the end face of the expansion segment 133 facing the connecting segment 135.

[0065] As an example, the first annular limiting segment 151 may be connected to the inner annular surface of the third annular limiting segment 155 and extend toward one side of the connecting segment 135. The second annular limiting segment 153 may be connected to the outer peripheral surface of the third annular limiting segment 155 and extend toward the side opposite to the connecting segment 135.

[0066] In some embodiments, the outer peripheral wall of the connecting segment 135 is provided with a second annular groove 1351 that communicates with the first annular groove 131.

[0067] As an example, the connecting segment 135 may include a first column segment and a second column segment connected along the axial direction Y of the pole post 130. The diameter of the second column segment may be smaller than the diameter of the first column segment to form a second annular groove 1351 on the outer periphery of the second column segment. Understandably, the first column segment may serve as the groove sidewall of the second annular groove 1351.

[0068] The insulating ring 170 may include a connecting ring 171 and a sealing ring 173.

[0069] Both the connecting ring 171 and the sealing ring 173 can be made of insulating materials. For example, the connecting ring 171 can be made of plastic, and the sealing ring 173 can be made of rubber, silicone, or other materials.

[0070] The connecting ring 171 can be disposed around the outer periphery of the limiting ring 150, and can abut against the sealing ring 173 along the axial direction Y of the pole post 130.

[0071] As an example, the connecting ring 171 can be disposed around the outer peripheral surfaces of the first annular limiting segment 151, the third annular limiting segment 155, and the second annular limiting segment 153. The shape of the connecting ring 171 and the shape of the limiting ring 150 can be approximately the same. The diameter of the inner ring of the connecting ring 171 can be approximately equal to the diameter of the outer ring of the limiting ring 150, which helps to make the inner ring surface of the connecting ring 171 and the outer peripheral surface of the limiting ring 150 more tightly connected.

[0072] The sealing ring 173 can be sleeved on the bottom wall of the second annular groove 1351. Along the axial direction Y of the pole post 130, the sealing ring 173 abuts against the groove side wall of the connecting ring 171 and the second annular groove 1351, which helps to improve the sealing performance between the groove side wall of the connecting ring 171 and the second annular groove 1351, and can also provide support for the connecting ring 171.

[0073] As an example, the sealing ring 173 can be fitted around the outer periphery of the second column segment, along the axial direction Y of the pole post 130, and the sealing ring 173 can abut against the first column segment and the connecting ring 171.

[0074] In some embodiments, the sealing ring 173 and the connecting ring 171 can cooperate to form an annular slot 175, and the cover 110 is inserted into the annular slot 175, thereby connecting and fixing the insulating ring 170 and the cover 110 to fix the pole post 130 to the cover 110.

[0075] As an example, the connecting ring 171 may include a first ring segment 1711, a second ring segment 1713, and a third ring segment 1715. The first ring segment 1711 may be connected to the inner annular surface of the second ring segment 1713 and extend towards one side of the connecting segment 135. The third ring segment 1715 may be connected to the outer peripheral surface of the second ring segment 1713 and extend away from the connecting segment 135. The first ring segment 1711 may be wrapped around the outer peripheral surface of the first annular limiting segment 151, the second ring segment 1713 may be wrapped around the outer peripheral surface of the third annular limiting segment 155, and the third ring segment 1715 may be wrapped around the outer peripheral surface of the second annular limiting segment 153. The sealing ring 173 may abut between the end face of the first ring segment 1711 and the groove sidewall of the second annular groove 1351. The sealing ring 173, the first ring segment 1711, and the second ring segment 1713 may form an annular slot 175 with the opening facing outward of the connecting ring 171.

[0076] Understandably, the sealing ring 173 and the second ring segment 1713 can be the two sidewalls of the annular slot 175, and the first ring segment 1711 can be the bottom wall of the sealing ring 173. The cover 110 can be inserted into the annular slot 175 and abut against the second ring segment 1713 and the sealing ring 173, which helps to improve the sealing effect between the cover 110 and the sealing ring 173. The cover 110 can also abut against the first ring segment 1711, which helps to make the connection between the connecting ring 171 and the cover 110 tighter.

[0077] In some embodiments, along the axial direction Y of the pole post 130, the sealing ring 173 can also abut against the groove sidewall of the second annular groove 1351 and the cover 110, which helps to increase the sealing performance between the cover 110 and the groove sidewall of the second annular groove 1351.

[0078] As an example, along the axial direction Y of the pole post 130, the sealing ring 173 can abut between the first pole segment and the cover 110.

[0079] In some embodiments, the cover 110 may include an annular surface 113 and an annular protrusion 115.

[0080] The annular surface 113 can form the mounting hole 111, that is, the annular surface 113 can be the inner surface of the mounting hole 111.

[0081] An annular protrusion 115 protrudes from the annular surface 113 and is inserted into the annular slot 175 to connect the cover 110 to the insulating ring 170.

[0082] In some embodiments, the bottom wall of the first annular groove 131 may be provided with a positioning groove 143, and the limiting ring 150 located in the first annular groove 131 may be inserted into the positioning groove 143, so that the positioning groove 143 can provide a more definite installation position for the limiting ring 150, and the side wall of the positioning groove 143 can also support the limiting ring 150.

[0083] As an example, along the radial direction X of the pole post 130, the first annular limiting segment 151 can abut against the bottom wall of the positioning groove 143. Along the axial direction Y of the pole post 130, the first annular limiting segment 151 can abut against the two side walls of the positioning groove 143.

[0084] The top cover assembly 100 is manufactured as follows: a columnar body (i.e., the conductive material used to make the pole post 130, such as a copper pole, aluminum pole, or other material) is pre-pressed into a general shape. The pre-pressed columnar body may include a first column and a second column connected along the axial direction Y. The diameter of the second column may be smaller than the diameter of the first column. It can be understood that the first column is the first column segment in the above embodiment, and the second column may include the second column segment, the intermediate segment, and the expanded segment 133 in the above embodiment.

[0085] The second column is inserted into the mounting hole 111 of the cover 110.

[0086] The sealing ring 173 is fitted onto the second column and abuts against the first column.

[0087] The connecting ring 171 and the limiting ring 150 are fitted onto the outer periphery of the second column on the side opposite to the first column, such that the limiting ring 150 is located between the connecting ring 171 and the column, and the cover 110 is located between the second ring segment 1713 of the connecting ring 171 and the sealing ring 173.

[0088] The second column is pressed using a pressing process, which causes the second column to expand and the first annular limiting segment 151 of the limiting ring 150 to abut tightly.

[0089] The end of the second column that is away from the first column is processed using a riveting process, for example, it can be riveted at approximately a 45-degree angle.

[0090] The riveted end is then flattened, increasing the radial dimension of the second column located between the third annular limiting segment 155 and the second annular limiting segment 153, forming an expanded segment 133. This creates a groove between the expanded segment 133 and the first column, including the first annular groove 131 and the second annular groove 1351, thus machining the column into an electrode post 130. The expanded segment 133 can cooperate with the first column to press the cover 110 between the second annular segment 1713 and the sealing ring 173 of the connecting ring 171, thereby insulatingly fixing the electrode post 130 to the cover 110.

[0091] It should be noted that the above-described processing method of the top cover assembly 100 is only an example for the purpose of understanding. In actual processing, the processing steps and methods can be adjusted according to the actual situation.

[0092] 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. The outer peripheral wall of the terminal post 130 is surrounded by a first annular groove 131 and includes an expanded section 133 and a connecting section 135. Along the axial direction Y of the terminal post 130, the expanded section 133 and the connecting section 135 are respectively located on opposite sides of the first annular groove 131. A limiting ring 150 is wrapped around the bottom wall of the first annular groove 131 and the outer peripheral surface of the expanded section 133, and an insulating ring 170 is wrapped around the outer peripheral surface of the limiting ring 150. Thus, during the riveting process of the terminal post 130, the limiting ring 150 can limit the radial dimension of the terminal post 130 at the position of the first annular groove 131 and the expanded section 133, which helps to improve the problem of the insulating ring 170 cracking due to excessive increase in the radial dimension of the terminal post 130 during the riveting process, and improves the overall structural stability of the top cover assembly 100.

[0093] 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. The outer peripheral wall of the electrode post is surrounded by a first annular groove and includes an expanded section and a connecting section. Along the axial direction of the electrode post, the expanded section and the connecting section are located on opposite sides of the first annular groove. A limiting ring is provided around the bottom wall of the first annular groove and the outer peripheral surface of the expanded segment; as well as An insulating ring is provided around the outer peripheral surface of the limiting ring, and the cover is connected to the insulating ring.

2. 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.

3. The top cover assembly according to claim 1, characterized in that, The limiting ring includes a first annular limiting segment and a second annular limiting segment connected along the axial direction. The first annular limiting segment abuts against the bottom wall of the first annular groove, and the second annular limiting segment abuts against the outer peripheral surface of the expanding segment. The insulating surround is provided on the outer peripheral surface of the first annular limiting segment and the second annular limiting segment.

4. The top cover assembly according to claim 3, characterized in that, The limiting ring further includes a third annular limiting segment connected between the first annular limiting segment and the second annular limiting segment; Along the axial direction of the pole post, the first annular groove has an annular inner wall surface, the outer peripheral surface of the expanding segment is connected to the annular inner wall surface, and the third annular limiting segment is located in the first annular groove and abuts against the annular inner wall surface.

5. The top cover assembly according to claim 1, characterized in that, Along the axial direction of the pole, the projected portions of the cover and the expansion segment overlap.

6. The top cover assembly according to claim 1, characterized in that, The outer peripheral wall of the connecting section is provided with a second annular groove that communicates with the first annular groove. The insulating ring includes a connecting ring and a sealing ring. The connecting ring is disposed around the outer periphery of the limiting ring, and the sealing ring is sleeved on the bottom wall of the second annular groove. Along the axial direction of the pole, the sealing ring abuts against the groove sidewall of the connecting ring and the second annular groove, and cooperates with the connecting ring to form an annular slot, and the cover is inserted into the annular slot.

7. The top cover assembly according to claim 6, characterized in that, Along the axial direction of the pole, the sealing ring also abuts between the groove sidewall of the second annular groove and the cover.

8. The top cover assembly according to claim 6, characterized in that, The cover includes an annular surface and an annular protrusion, the annular surface forming the mounting hole; the annular protrusion protrudes from the annular surface and is inserted into the annular slot.

9. The top cover assembly according to claim 1, characterized in that, The bottom wall of the first annular groove is provided with a positioning groove, and the limiting ring located in the first annular groove is inserted into the positioning groove.

10. A battery, characterized in that, Includes the top cover assembly according to any one of claims 1 to 9.

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