Cover plate assembly and battery

Abstract

The embodiment of the invention provides a cover plate assembly and a battery. The cover plate assembly comprises a cover plate main body, a pole and a connecting piece, the cover plate main body is provided with a first through hole, and the first through hole penetrates through the cover plate main body along a first direction. The pole is arranged in the first through hole, the two ends, in the first direction, of the pole extend out of the first through hole, the outer circumferential faces of the two ends of the pole protrude out of the inner circumferential face of the first through hole, one of the two ends of the pole is further provided with a containing groove, and a first limiting part is formed on the side wall, close to the opening, of the containing groove. The connecting piece is arranged in the containing groove and abuts against the first limiting part, and the side face of the connecting piece makes contact with the side wall of the containing groove. The cover plate assembly is used for achieving the effect of improving the over-current capability.

Description

Technical Field

[0001] The present application relates to new energy sources, and in particular to a cover plate assembly and a battery. Background Art

[0002] With the development of science and technology and the continuous increase in energy demand, new energy storage devices have become a hot topic in the field of new energy. Power batteries, especially lithium batteries, are widely used in information technology, electric vehicles, aerospace and other fields due to their advantages such as high cycle life, low mass and no memory response.

[0003] The battery generally includes a shell, a battery cell disposed in the shell, and a cover assembly that covers the shell. The battery cell is provided with a tab, and the cover assembly is provided with a pole, which needs to be electrically connected to the tab to achieve external connection of the battery cell. However, the current capacity of the cover assembly is low. Summary of the invention

[0004] The embodiments of the present application provide a cover plate assembly and a battery to achieve the effect of improving the current flow capacity.

[0005] In a first aspect, an embodiment of the present application provides a cover plate assembly, comprising: a cover plate body, the cover plate body having a first through hole, the first through hole penetrating the cover plate body along a first direction;

[0006] A pole disposed in the first through hole, both ends of the pole in the first direction extending outward from the first through hole, and the outer circumferences of both ends of the pole protruding from the inner circumference of the first through hole, one of the two ends of the pole is further provided with a receiving groove, and a first limiting portion is formed on a side wall of the receiving groove adjacent to the opening;

[0007] A connecting piece is arranged in the receiving groove and abuts against the first limiting portion, and a side surface of the connecting piece contacts a side wall of the receiving groove.

[0008] In a possible implementation manner, the pole, the cover plate body, and the connecting piece are all riveted together.

[0009] In a possible implementation manner, the first limiting portion is annular, and the first limiting portion is formed after the pole is riveted.

[0010] In a possible implementation manner, one end of the pole where the accommodation groove is provided is further formed with a first outer edge, and the first outer edge is formed after the pole is riveted.

[0011] In a possible implementation manner, the connecting piece includes a first segment and a second segment connected to each other;

[0012] The second segment is located on a side of the first segment away from the bottom of the receiving groove, and a connection between the first segment and the second segment forms a first step surface away from the bottom of the receiving groove;

[0013] The first limiting portion abuts against the first step surface.

[0014] In a possible implementation manner, the accommodating groove is a stepped groove, and the second step surface of the stepped groove is away from the groove bottom of the accommodating groove and abuts against the connecting piece.

[0015] In a possible implementation manner, a surface of the pole facing away from the receiving groove is a plane.

[0016] In a possible implementation, the cover plate assembly further includes a bracket and an isolation member;

[0017] The bracket is arranged on a side of the cover body adjacent to the opening of the receiving groove, the bracket is formed with a second through hole opposite to the first through hole, and a second limiting portion is formed on the side wall of the second through hole adjacent to the cover body;

[0018] The isolating member is sleeved on the pole, one end of the isolating member extends to an end of the pole away from the opening of the accommodating groove, and the other end of the isolating member extends into the second through hole and covers at least a portion of the second limiting portion.

[0019] In a possible implementation manner, the isolation member includes an insulating member and a sealing member;

[0020] The sealing member is sleeved on the pole, and the first end of the sealing member covers a portion of the second limiting portion;

[0021] The insulating member is sleeved on the second end of the sealing member and extends to an end of the pole away from the opening of the accommodating groove.

[0022] In a possible implementation manner, a portion of the surface of the cover plate body is exposed in the second through hole;

[0023] The first end of the sealing member has a third step surface and a fourth step surface, the third step surface abuts against the exposed surface of the cover plate assembly, and the fourth step surface abuts against the surface of the second limiting portion facing away from the cover plate assembly.

[0024] In a possible implementation manner, a surface of the cover plate body facing away from the opening of the accommodating groove is further formed with an annular groove, and the annular groove is sleeved outside the first through hole and communicated with the first through hole;

[0025] Part of the insulating member is located in the annular groove.

[0026] In a second aspect, an embodiment of the present application provides a battery, comprising:

[0027] a housing having an opening;

[0028] A battery cell, wherein the battery cell is arranged in the housing;

[0029] As described above, the cover plate assembly is buckled on the opening, and the connecting piece of the cover plate assembly is electrically connected to the battery core.

[0030] The cover plate assembly and the battery provided in the embodiment of the present application fix the connecting piece in the receiving groove by the first limiting part to prevent the connecting piece from being separated from the receiving groove, so that the connecting piece is embedded in the pole and part of the surface is exposed. The side of the connecting piece contacts the side wall of the receiving groove, and the perimeter of the side wall of the receiving groove is relatively long, so that the contact area between the connecting piece and the pole is relatively large, and the flow area of ​​the two can be effectively improved, so as to improve the flow capacity of the cover plate assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0032] Figure 1 An exploded view of the battery provided for this application;

[0033] Figure 2 A partial schematic diagram of a battery provided for this application;

[0034] Figure 3 An exploded view of the cover assembly provided for this application;

[0035] Figure 4 An assembly diagram of the cover assembly provided for this application;

[0036] Figure 5 A schematic diagram of the pole provided for this application;

[0037] Figure 6 A schematic diagram of the pole before riveting provided in this application;

[0038] Figure 7 A schematic diagram of the cover plate assembly after welding provided in this application;

[0039] Figure 8 A schematic diagram of the cover plate assembly after welding provided for related technology.

[0040] Description of reference numerals:

[0041] 10-battery; 20-housing;

[0042] 30-battery cell; 31-ear;

[0043] 40-cover plate assembly; 41-cover plate body;

[0044] 42-pole; 43-connecting piece;

[0045] 44-insulating member; 45-sealing member;

[0046] 46- bracket; 51- first surface;

[0047] 52-second surface; 53-first through hole;

[0048] 61 - a first end of the pole; 62 - a second end of the pole;

[0049] 63-accommodation slot; 64-pole body;

[0050] 65-first outer edge; 66-second outer edge;

[0051] 67-first limiting portion; 71-second limiting portion;

[0052] 72-second through hole; 73-third through hole;

[0053] 74- fourth through hole; 81- bus bar;

[0054] 82-riveting concave platform; 83-welding track. DETAILED DESCRIPTION

[0055] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application. Instead, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0056] In the related art, the current capacity of the cover assembly is relatively low. The reason is that the pole is fixedly connected and electrically conductive through the riveted column and the connecting piece, the connecting piece is welded to the pole ear, and the contact area between the riveted column and the pole is limited, which makes the current capacity of the cover assembly relatively low. As the market's requirements for the charge and discharge rate of the battery cell become higher and higher, the requirements for the current capacity inside the cover assembly become more stringent.

[0057] In order to increase the current capacity of the cover plate assembly, the method of increasing the number of riveted posts of the pole is usually used to increase the total contact surface between the pole and the riveted posts, but this method increases the contact area to a limited extent and increases the weight and cost of raw materials. At the same time, the increase in riveted posts will also reduce the effective welding area of ​​the busbar, resulting in a decrease in the effective current flow area between the busbar and the pole.

[0058] The cover plate assembly provided by the present application fixes the connecting piece in the receiving groove of the pole through the first limiting part, so that the connecting piece is embedded in the pole and a part of the surface is exposed to connect with the battery cell. By taking advantage of the longer perimeter of the receiving groove, the contact connection between the connecting piece and the pole is increased, thereby increasing the flow area of ​​the two and improving the flow effect.

[0059] The technical solution of the present application and how the technical solution of the present application solves the above-mentioned technical problems are described in detail below with specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The embodiments of the present application will be described below in conjunction with the accompanying drawings.

[0060] See also Figure 1 and Figure 2 The embodiment of the present application provides a battery 10, which is, for example, a lithium-ion battery, so as to have a high capacity and voltage. The battery 10 can be square in shape as a whole, and the battery 10 includes a shell 20, a battery cell 30, and a cover assembly 40. The shell 20 has an opening, for example, both sides of the shell 20 are openings, so as to facilitate the removal of the battery cell 30, and the shell 20 is, for example, a square shell.

[0061] The battery cell 30 is disposed in the housing 20. The battery cell 30 has, for example, tabs on both sides, that is, the tabs 31 of the battery cell 30 are located on both sides, respectively opposite to the two openings, so as to improve the volume utilization and cycle performance of the battery cell 30. The battery cell 30 also includes a positive electrode sheet and a negative electrode sheet arranged relatively, and a separator arranged between the positive electrode sheet and the negative electrode sheet. Exemplarily, the positive electrode sheet, the negative electrode sheet and the separator can be wound, that is, the battery cell 30 is a winding core. The positive electrode sheet, the negative electrode sheet and the separator can adopt the existing structure, which will not be repeated here.

[0062] The positive electrode sheet is connected to one pole ear 31, such as by welding or gluing, and the pole ear 31 is the positive pole ear. The negative electrode sheet is connected to another pole ear 31, such as by welding or gluing, and the pole ear 31 is the negative pole ear. The positive pole ear and the negative pole ear are respectively located on both sides of the positive electrode sheet / negative electrode sheet, that is, the positive pole ear is adjacent to an opening of the housing 20 and is externally connected through the opening, and the negative pole ear is adjacent to another opening of the housing 20 and is externally connected through the opening.

[0063] like Figure 1 and Figure 2 As shown, the cover assembly 40 is buckled on the opening, for example, a cover assembly 40 is buckled on each opening. The cover assembly 40 and the shell 20 enclose a receiving cavity, and the battery cell 30, the electrolyte, etc. are located in the receiving cavity. The cover assembly 40 is sealed and connected to the shell 20, for example, a sealing ring is provided between the cover assembly 40 and the shell 20 to ensure the sealing of the receiving cavity and prevent leakage of the electrolyte therein. The cover assembly 40 is also electrically connected to the corresponding pole ear 31 of the battery cell 30 to achieve the connection of the battery cell 30.

[0064] See also Figure 2 and Figure 3 The cover assembly 40 includes a cover body 41, a pole 42 and a connecting piece 43. The cover body 41 is used to carry structures such as the pole 42 and the connecting piece 43, and is fixedly connected to the shell 20. For example, the cover body 41 is connected to the shell 20 by circumferential welding. The pole 42 and the connecting piece 43 are fixedly connected and fixedly connected to the cover body 41. For example, the pole 42 and the cover body 41 and the connecting piece 43 are riveted. The pole 42 and the connecting piece 43 are also electrically connected to the battery cell 30, so that the battery cell 30, the connecting piece 43, and the pole 42 are conductive, thereby realizing the external connection of the battery cell 30.

[0065] For example, see Figure 2 and Figure 4 The connecting piece 43 is fixedly connected to the pole 42, for example, the connecting piece 43 is embedded in the pole 42 to increase the contact area between the connecting piece 43 and the pole 42, thereby increasing the flow area between the connecting piece 43 and the pole 42. The connecting piece 43 also exposes a portion of the surface to connect with the battery cell 30, for example, the connecting piece 43 is welded to the pole ear 31 adjacent to the battery cell 30. In this way, electrical conduction between the battery cell 30 and the pole 42 can be achieved, and the pole 42 can be used for external connection, for example, the pole 42 is welded to the bus bar.

[0066] For details, see Figures 2 to 4 The cover body 41 has a first through hole 53, and the first through hole 53 penetrates the cover body 41 along a first direction. The first direction is the thickness direction of the cover body 41. Figure 2 As shown, the first direction is the horizontal direction (X direction).

[0067] The cover body 41 has a first surface 51 and a second surface 52 arranged opposite to each other along a first direction, and the first through hole 53 passes through the first surface 51. The first surface 51 is the surface of the cover body 41 away from the battery cell 30 ( Figure 2 The second surface 52 is the surface of the cover body 41 facing the battery cell 30 ( Figure 2 left surface shown).

[0068] like Figure 2 and Figure 3 As shown, the first through hole 53 is, for example, a straight through hole, and its shape can be circular, elliptical, rectangular, or other polygonal. Exemplarily, the first through hole 53 is in the shape of an oblong hole, such as an oblong hole, so that it can adapt to the width of the cover body 41 and obtain a larger surface area.

[0069] Continue reading Figures 2 to 4The pole 42 is disposed in the first through hole 53, and both ends of the pole 42 in the first direction extend outward from the first through hole 53, and the outer circumferences of both ends of the pole 42 protrude from the inner circumference of the first through hole 53. The shapes of the two ends of the pole 42 may be different. For example, the outer circumference of one end of the pole 42 is the same as the shape of the first through hole 53, for example, both are oblong holes, and the outer circumference of the other end of the pole 42 is rectangular, so that it has a larger contact area.

[0070] The two ends of the pole 42 along the first direction are respectively a first end 61 and a second end 62. The first end 61 of the pole 42 protrudes from the first surface 51 of the cover body 41, and the outer peripheral surface of the first end 61 of the pole 42 protrudes from the inner peripheral surface of the first through hole 53. The second end 62 of the pole 42 protrudes from the second surface 52 of the cover body 41, and the outer peripheral surface of the second end 62 of the pole 42 protrudes from the inner peripheral surface of the first through hole 53. In this way, Figure 3 As shown, a groove is formed on the outer circumference of the pole 42. The groove is annular, and the first through hole 53 is sleeved in the groove.

[0071] For some possible examples, see Figure 5 The pole 42 includes a pole body 64, a first outer edge 65, and a second outer edge 66, wherein the first outer edge 65 and the second outer edge 66 are both sleeved on the pole body 64 and are respectively located at two opposite ends of the pole body 64 along the first direction. The surface of the first outer edge 65 away from the second outer edge 66 is flush with the surface of the pole body 64 away from the second outer edge 66, and the surface of the second outer edge 66 away from the first outer edge 65 is flush with the surface of the pole body 64 away from the first outer edge 65. For example, the surfaces of the first outer edge 65 and the second outer edge 66 away from each other are respectively flush with the end surfaces of the two ends of the pole body 64.

[0072] Among them, see Figure 6 The second outer edge 66 is formed when the pole 42 is manufactured, and the first outer edge 65 is formed after the pole 42 is riveted, that is, the pole 42 is also used as a rivet, and the second end 62 of the pole 42 is compressed by a rivet gun or other tools to form the above-mentioned first outer edge 65.

[0073] In order to facilitate the arrangement of the connecting piece 43 and the connection between the pole 42, the connecting piece 43 and the cover body 41, in some possible embodiments, one of the two ends of the pole 42 is further provided with a receiving groove 63, and a first limiting portion 67 is formed on the side wall of the receiving groove 63 adjacent to the opening. Figure 5 As shown, the end surface of the second end 62 of the pole 42 is provided with a receiving groove 63 , and the receiving groove 63 and the first outer edge 65 are located on the same side.

[0074] The receiving groove 63 is a blind groove, that is, the receiving groove 63 does not extend to the first end 61 of the pole 42, and does not penetrate the pole 42. The extending direction of the receiving groove 63 can be parallel to the first direction. In some possible examples, the surface of the pole 42 away from the receiving groove 63 is a plane, that is, the end surface of the first end 61 of the pole 42 is a plane, and there is no riveting recess 82 on the end surface. Figure 7 and Figure 8 When the busbar 81 is welded to the pole 42 , the welding track 83 can be distributed on the surface of the pole 42 to the greatest extent, thereby increasing the effective connection area (welding area) between the busbar 81 and the pole 42 , thereby increasing the current carrying capacity.

[0075] Continue reading Figure 4 and Figure 5 , the first limiting portion 67 is located on the side wall of the receiving groove 63 and away from the bottom of the receiving groove 63, that is, the first limiting portion 67 is adjacent to the opening of the receiving groove 63. Exemplarily, the surface of the first limiting portion 67 away from the bottom of the receiving groove 63 is flush with the end surface of the second end 62 of the pole 42. The first limiting portion 67 can be annular, and its shape is adapted to the shape of the receiving groove 63, for example, the same.

[0076] In some possible examples, the first limiting portion 67 is formed after the pole 42 is riveted, that is, the second end 62 of the pole 42 is pressed by a rivet gun or other tools to form the first limiting portion 67. Further, the first limiting portion 67 and the first outer edge 65 are formed at the same time, see Figure 4 and Figure 6 The pole 42 is in a hollow waist shape, that is, before riveting, an end surface of the second end 62 of the pole 42 is formed with a receiving groove 63, and the outer periphery of the second end 62 of the pole 42 and the wall surface of the receiving groove 63 are both straight walls.

[0077] After the cover assembly 40 is assembled, the second end 62 of the pole 42 is operated with a rivet gun or other tools, and the second end 62 of the pole 42 is deformed outward from the receiving groove 63 to form a first outer edge 65, and is deformed into the receiving groove 63 to form a first limiting portion 67, so as to fix the connecting piece 43, the pole 42, the cover body 41, etc. together.

[0078] In some possible examples, the receiving groove 63 is a stepped groove, and the second step surface of the stepped groove is away from the groove bottom of the receiving groove 63 and abuts against the connecting piece 43. In this way, the size of the groove bottom of the receiving groove 63 is large, the size of the opening of the receiving groove 63 is small, and the second step surface provides support for the connecting piece 43. By providing the stepped groove, the weight of the pole 42 can be reduced, thereby reducing the raw materials of the pole 42 and reducing the cost of the cover assembly 40.

[0079] See also Figures 2 to 4, the connecting piece 43 is arranged in the receiving groove 63, which is a conductive material. The connecting piece 43 is against the first limiting portion 67, and the side of the connecting piece 43 is in contact with the side wall of the receiving groove 63. The first limiting portion 67 can prevent the connecting piece 43 from being separated from the receiving groove 63, so that the connecting piece 43 is embedded in the pole 42, and part of the surface is exposed. The side of the connecting piece 43 is in contact with the side wall of the receiving groove 63, for example, it fits, and the circumference of the side wall of the receiving groove 63 is relatively long, so that the contact area between the connecting piece 43 and the pole 42 is relatively large, and the flow area of ​​the two can be effectively improved.

[0080] For some possible examples, see Figure 4 and Figure 5 , the surface of the connecting piece 43 away from the bottom of the receiving groove 63 can be flush with the end surface of the second end 62 of the pole 42. In this way, the surface of the connecting piece 43, the pole body 64, the first limiting portion 67 and the first outer edge 65 away from the bottom of the receiving groove 63 forms a plane.

[0081] The connecting piece 43 includes a first segment and a second segment connected to each other. The second segment is located on a side of the first segment away from the bottom of the receiving groove 63, and the connection between the first segment and the second segment forms a first step surface away from the bottom of the receiving groove 63. The first limiting portion 67 abuts against the first step surface.

[0082] like Figure 3 As shown, the first segment is close to the bottom of the receiving groove 63. For example, the first segment abuts against the bottom of the receiving groove 63. For another example, the surface of the first segment facing the bottom of the receiving groove 63 abuts against the second step surface of the receiving groove 63 and is spaced from the bottom of the receiving groove 63.

[0083] One end of the first segment away from the bottom of the receiving groove 63 is connected to one end of the second segment, and the size of the first segment is larger than the size of the second segment, so that the surface of the first segment away from the bottom of the receiving groove 63 is at least partially exposed to form a first step surface. Exemplarily, the first step surface surrounds the second segment. The first limit portion 67 can be located on the first step surface, for example, the first limit portion 67 and the second step surface are against each other.

[0084] The first limiting portion 67 at least presses against the first segment, thereby fixing the connecting piece 43 in the receiving groove 63. For example, the connecting piece 43 can be directly riveted by the pole 42 in the receiving groove 63. The connecting piece 43 is directly riveted by the pole 42, and there is no need to separately set rivets / rivet columns, etc., which reduces the use of raw materials and production processes of the cover plate assembly 40 and reduces the cost of the cover plate assembly 40. The first limiting portion 67 can also be against the second segment, for example, the first limiting portion 67 is circumferentially against the second segment.

[0085] Continue reading Figures 2 to 4The cover assembly 40 further includes a bracket 46 and a spacer. The bracket 46 is disposed on one side of the cover body 41 adjacent to the opening of the receiving groove 63, that is, the bracket 46 is disposed on one side of the cover body 41 adjacent to the battery cell 30. Figure 2 As shown, the bracket 46 is disposed on the second surface 52 of the cover body 41. The bracket 46 is located between the cover body 41 and the battery cell 30, and defines the distance between the battery cell 30 and the cover body 41. The bracket 46 is made of insulating material, and plays an insulating role for the cover body 41 and the battery cell 30.

[0086] The bracket 46 is provided with a second through hole 72, which penetrates the bracket 46 along the first direction, and the second through hole 72 is opposite to the first through hole 53. The size of the second through hole 72 can be larger than the size of the first through hole 53, so that part of the surface of the cover body 41 is exposed in the second through hole 72. A second limiting portion 71 is formed on the side wall of the second through hole 72 adjacent to the cover body 41, that is, the second limiting portion 71 is located on the side wall of the second through hole 72 and adjacent to the cover body 41. Exemplarily, the surface of the bracket 46 facing the cover body 41 is a plane. Exemplarily, the second limiting portion 71 is annular. In this way, the surface of the second limiting portion 71 facing away from the cover body 41 forms a fifth step surface to cooperate with the isolation member.

[0087] Continue reading Figures 2 to 4 The isolating member is sleeved on the pole 42, one end of the isolating member extends to the end of the pole 42 away from the opening of the receiving groove 63, and the other end of the isolating member extends into the second through hole 72 and covers at least a part of the second limiting portion 71. The isolating member can ensure the insulation isolation between the cover body 41 and the pole 42, and is pressed against the cover body 41 through the pole 42.

[0088] In some possible examples, the isolating member includes an insulating member 44 and a sealing member 45; the sealing member 45 is sleeved on the pole 42, and the first end 61 of the sealing member 45 covers part of the second limiting portion 71. The insulating member 44 is sleeved on the second end 62 of the sealing member 45, and extends to an end of the pole 42 away from the opening of the receiving groove 63. The sealing member 45 is used to achieve insulation and sealing of the pole 42 and the cover body 41, and the insulating member 44 is used to further avoid contact between the end of the pole 42 and the surface (for example, the first surface 51) of the cover body 41, thereby ensuring insulation and sealing of the pole 42 and the cover body 41.

[0089] The seal 45 is sleeved on the pole 42 and is located between the first outer edge 65 and the second outer edge 66 of the pole 42. The first end of the seal 45 is stepped, so that the first end of the seal 45 has a third step surface and a fourth step surface, the third step surface abuts against the exposed surface of the cover assembly 40, and the fourth step surface abuts against the surface of the second limit portion 71 away from the cover body 41.

[0090] Specifically, the seal 45 includes a first sub-body, a second sub-body and a third sub-body connected in sequence, that is, both ends of the second sub-body are connected to the first sub-body and the third sub-body, the third sub-body forms the first end of the seal 45, and the first sub-body forms the second end of the seal 45. The seal 45 also has a third through hole 73, which passes through the first sub-body, the second sub-body and the third sub-body for the pole 42 to extend into. Among them, the inner circumferences of the third through hole 73 in the first sub-body, the third through hole 73 in the second sub-body and the third through hole 73 in the third sub-body are aligned, that is, the third through hole 73 is a straight hole.

[0091] The first sub-body is located in the first through hole 53, and one end of the first sub-body away from the second sub-body can extend out of the first through hole 53. The second sub-body and the third sub-body are both located outside the first through hole 53, and the outer circumferences of the second sub-body and the third sub-body are both protruding from the inner circumference of the first through hole 53. The second sub-body, the third sub-body and the bracket 46 are located on the same side of the cover body 41.

[0092] The outer circumferential surface of the third sub-body protrudes from the outer circumferential surface of the second sub-body, so that a fourth step surface is formed at the intersection of the third sub-body and the second sub-body. Exemplarily, the fourth step surface surrounds the second sub-body. The fourth step surface faces the cover body, and it abuts against the surface of the second limit portion 71 that is away from the cover body 41. The outer circumferential surface of the second sub-body protrudes from the outer circumferential surface of the first sub-body, so that a third step surface is formed at the intersection of the second sub-body and the first sub-body. Exemplarily, the third step surface surrounds the first sub-body. The third step surface faces the cover body, and it abuts against the surface of the cover body 41 exposed in the second through hole 72.

[0093] Continue reading Figures 2 to 4 The insulating member 44 is sleeved outside the sealing member 45, and the first end of the insulating member 44 overlaps with the second end of the sealing member 45, that is, the first end of the insulating member 44 is located on the first split body of the sealing member 45. The second end of the insulating member 44 extends to the end of the pole 42 away from the opening of the receiving groove 63, that is, the insulating member 44 extends to the outer peripheral surface of the second outer edge 66 to surround the first end 61 of the pole 42.

[0094] In some possible examples, an annular groove is further formed on the surface of the cover body 41 that is away from the opening of the accommodating groove 63 (i.e., the first surface 51 of the cover body 41), and the annular groove is sleeved outside the first through hole 53 and communicated with the first through hole 53. Part of the insulating member 44 is located in the annular groove to limit the insulating member 44. The insulating member 44 is also located between the surfaces of the cover body 41 and the second outer edge 66 that face each other.

[0095] like Figure 3 and Figure 4As shown, the insulating member 44 includes a fourth sub-body, a fifth sub-body and a sixth sub-body connected in sequence, and the two ends of the fifth sub-body are connected to the fourth sub-body and the sixth sub-body respectively. The insulating member 44 also has a fourth through hole 74, which penetrates the fourth sub-body, the fifth sub-body and the sixth sub-body for the pole 42 to pass through. The inner circumference of the fourth through hole 74 in the fourth sub-body and the inner circumference of the fourth through hole 74 in the fifth sub-body are aligned, and the inner circumference of the fourth through hole 74 in the sixth sub-body protrudes from the inner circumference of the fourth through hole 74 in the fifth sub-body, that is, the fourth through hole 74 is a stepped hole.

[0096] The outer circumference of the fifth body protrudes from the outer circumference of the fourth body, and the fourth body is located in the annular groove of the cover body 41. The fifth body is located on the surface (e.g., the first surface 51) of the cover body 41, and the sixth body surrounds the end of the pole 42 that is away from the opening of the receiving groove 63 (i.e., the second end 62 of the pole 42). The outer circumference of the fifth body and the outer circumference of the sixth body can be aligned.

[0097] See also Figure 5 and Figure 6 , assemble the bracket 46, the cover body 41, the insulating member 44, the sealing member 45, the pole 42 and the connecting piece 43 together, the first end 61 of the pole 42 cooperates with the insulating member 44, the second end 62 of the pole 42 is exposed, and the connecting piece 43 is located in the receiving groove 63 of the pole 42. The pole 42 is riveted and fixed, and the bracket 46, the cover body 41, the insulating member 44, the sealing member 45, the pole 42 and the connecting piece 43 are fixed by the pole 42. The second end 62 of the pole 42 is deformed to form a first outer edge 65 outwardly, which overlaps the sealing member 45, and the sealing member 45, the insulating member 44, and the bracket 46 are pressed and fixed on the cover body 41. A first limiting portion 67 is formed inwardly, and the connecting piece 43 is pressed in the receiving groove 63 to achieve the fixation between the connecting piece 43 and the pole 42.

[0098] In other embodiments, the cover assembly further includes an explosion-proof valve, which is disposed on the cover body.

[0099] The cover plate assembly 40 in the embodiment of the present application includes a cover plate body 41, a pole 42 and a connecting piece 43. The cover plate body 41 has a first through hole 53 that penetrates the cover plate body 41. The pole 42 is arranged in the first through hole 53, and both ends extend outward from the first through hole 53. The outer peripheral surfaces of both ends of the pole 42 protrude from the inner peripheral surface of the first through hole 53 to achieve fixation with the cover plate body 41. One of the two ends of the pole 42 is also provided with a receiving groove 63, and a first limiting portion 67 is formed on the side wall of the receiving groove 63 adjacent to the opening. The connecting piece 43 is arranged in the receiving groove 63 and abuts against the first limiting portion 67 to prevent the connecting piece 43 from detaching from the receiving groove 63, so that the connecting piece 43 is embedded in the pole 42, and part of the surface is exposed. The side of the connecting piece 43 contacts the side wall of the receiving groove 63, and the side wall of the receiving groove 63 has a long circumference, so that the contact area between the connecting piece 43 and the pole 42 is large, and the flow area of ​​the two can be effectively improved.

[0100] Finally, it should be noted that those skilled in the art will readily conceive of other embodiments of the present invention after considering the specification and practicing the invention disclosed herein. The present invention is intended to cover any variations, uses or adaptations of the present invention, which follow the general principles of the present invention and include common knowledge or customary technical means in the art not disclosed by the present invention, are not limited to the precise structure described above and shown in the drawings, and may be modified and changed in various ways without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

Claims

1. A cover plate assembly, characterized in that: include: A cover plate body, wherein the cover plate body has a first through hole, and the first through hole penetrates the cover plate body along a first direction; A pole disposed in the first through hole, both ends of the pole in the first direction extending outward from the first through hole, and the outer circumferences of both ends of the pole protruding from the inner circumference of the first through hole, one of the two ends of the pole is further provided with a receiving groove, and a first limiting portion is formed on a side wall of the receiving groove adjacent to the opening; A connecting piece is arranged in the accommodating groove and abuts against the first limiting portion, and a side surface of the connecting piece contacts a side wall of the accommodating groove.

2. The cover plate assembly according to claim 1, characterized in that: The pole, the cover plate body and the connecting piece are all riveted.

3. The cover plate assembly according to claim 2, characterized in that: The first limiting portion is annular and is formed after the pole is riveted.

4. The cover plate assembly according to claim 2, characterized in that: One end of the pole where the receiving groove is arranged is also formed with a first outer edge, and the first outer edge is formed after the pole is riveted.

5. The cover plate assembly according to claim 1, characterized in that: The connecting piece includes a first segment and a second segment connected to each other; The second segment is located on a side of the first segment away from the bottom of the receiving groove, and a connection between the first segment and the second segment forms a first step surface away from the bottom of the receiving groove; The first limiting portion abuts against the first step surface.

6. The cover plate assembly according to claim 1, characterized in that: The accommodating groove is a stepped groove, and the second step surface of the stepped groove is away from the groove bottom of the accommodating groove and abuts against the connecting piece.

7. The cover plate assembly according to any one of claims 1 to 6, characterized in that: The surface of the pole facing away from the receiving groove is a plane.

8. The cover plate assembly according to any one of claims 1 to 6, characterized in that: The cover plate assembly also includes a bracket and a spacer; The bracket is arranged on a side of the cover body adjacent to the opening of the receiving groove, the bracket is formed with a second through hole opposite to the first through hole, and a second limiting portion is formed on the side wall of the second through hole adjacent to the cover body; The isolating member is sleeved on the pole, one end of the isolating member extends to an end of the pole away from the opening of the accommodating groove, and the other end of the isolating member extends into the second through hole and covers at least a portion of the second limiting portion.

9. The cover plate assembly according to claim 8, characterized in that: The isolating member includes an insulating member and a sealing member; The sealing member is sleeved on the pole, and the first end of the sealing member covers a portion of the second limiting portion; The insulating member is sleeved on the second end of the sealing member and extends to an end of the pole away from the opening of the accommodating groove.

10. The cover plate assembly according to claim 9, characterized in that: A portion of the surface of the cover plate body is exposed in the second through hole; The first end of the sealing member has a third step surface and a fourth step surface, the third step surface abuts against the exposed surface of the cover plate assembly, and the fourth step surface abuts against the surface of the second limiting portion facing away from the cover plate assembly.

11. The cover plate assembly according to claim 9, characterized in that: An annular groove is further formed on the surface of the cover plate body away from the opening of the receiving groove, and the annular groove is sleeved outside the first through hole and communicated with the first through hole; Part of the insulating member is located in the annular groove.

12. A battery, characterized in that: include: a housing having an opening; A battery cell, wherein the battery cell is arranged in the housing; The cover plate assembly as described in any one of claims 1 to 11, wherein the cover plate assembly is buckled on the opening, and the connecting piece of the cover plate assembly is electrically connected to the battery cell.

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