Top cover assembly, battery monomer and battery

Abstract

The utility model relates to a top cover assembly, a battery monomer and a battery. The top cover assembly comprises a cover plate, at least one pole and at least one limiting piece, the cover plate is provided with at least one pole hole, and the poles are inserted into the pole holes in a one-to-one correspondence mode and are insulated and isolated from the corresponding pole holes through the limiting pieces; at least one position in the circumferential direction of the pole is provided with a first anti-rotation surface, the limiting piece and the pole hole are respectively provided with a second anti-rotation part and a third anti-rotation part at positions corresponding to the first anti-rotation surface, and the first anti-rotation surface, the second anti-rotation part and the third anti-rotation part are mutually matched to limit relative rotation of the pole, the limiting piece and the pole hole; the second anti-rotation part comprises a second anti-rotation surface which is arranged on the inner wall of the limiting piece and is opposite to the first anti-rotation surface; the first anti-rotation face and the second anti-rotation face are both constructed to be T-shaped surfaces. The top cover assembly, the battery monomer and the battery disclosed by the utility model are better in anti-rotation effect and higher in safety and reliability.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field especially relates to a top cap subassembly, battery monomer and battery. BACKGROUND

[0002] Battery is the power supply of the power source for the tool, and the battery monomer in the battery usually includes a shell, a top cap and a battery cell. The battery cell is located in the shell and is packaged by the top cap. The top cap includes a cover plate and a pole post penetratingly arranged on the cover plate. The pole post is used for connecting the battery cell with the external power consuming equipment. In order to ensure the positioning effect of the pole post and the cover plate and prevent the rotational displacement between the pole post and the cover plate, an anti-rotation part is usually arranged between the pole post and the cover plate to realize the anti-rotation function of the pole post. However, in the battery monomer of the related art, the anti-rotation effect of the anti-rotation part between the pole post and the cover plate is poor. When the battery is subjected to vibration and impact, the pole post is easily damaged by the torsional force, which affects the reliability and safety of the battery. SUMMARY

[0003] Therefore, based on this, the embodiment of the present application provides a top cap subassembly, a battery monomer and a battery with better anti-rotation effect, higher safety and reliability.

[0004] The first aspect of the embodiment of the present application provides a top cap subassembly, which comprises a cover plate, at least one pole post and at least one limiting piece. The cover plate is provided with at least one pole post hole. Each pole post is inserted into the corresponding pole post hole and is insulated and isolated from the corresponding pole post hole by the limiting piece.

[0005] The circumferential direction of the pole post is provided with a first anti-rotation surface at at least one position. The position corresponding to the first anti-rotation surface on the limiting piece and the pole post hole is respectively provided with a second anti-rotation part and a third anti-rotation part. The first anti-rotation surface, the second anti-rotation part and the third anti-rotation part cooperate with each other to limit the relative rotation of the pole post, the limiting piece and the pole post hole. The second anti-rotation part comprises a second anti-rotation surface arranged on the inner wall of the limiting piece and opposite to the first anti-rotation surface.

[0006] The first anti-rotation surface and the second anti-rotation surface are both configured as T-shaped surfaces. The T-shaped surface comprises a first region and a second region located on the same plane. The length dimension of the first region along the first direction is greater than that of the second region. The first direction is parallel to the first region and perpendicular to the axial direction of the pole post.

[0007] In one of the embodiments, the pole post comprises a main body part inserted into the pole post hole. The main body part comprises a first main body segment and a second main body segment connected along the axial direction of the pole post. The outer contour dimension of the first main body segment is greater than that of the second main body segment.

[0008] The first region is located on the outer circumferential surface of the first main body segment, and the second region is located on the outer circumferential surface of the second main body segment. The first region and the second region are sequentially connected along the axial direction of the pole post.

[0009] In one of the embodiments, the main body part further comprises an auxiliary segment arranged on the surface of the first main body segment away from the second main body segment, the outer contour size of the auxiliary segment is smaller than that of the first main body segment, so as to form a stepped portion at the joint position of the auxiliary segment and the first main body segment;

[0010] The end of the limiting member along the axial direction of the pole column is formed with an extension portion, and the extension portion is lapped on the stepped portion.

[0011] In one of the embodiments, the pole column further comprises a first flange portion connected to the end of the second main body segment away from the first main body segment;

[0012] The limiting member comprises an isolation portion and a second flange portion connected to one end of the isolation portion, and the isolation portion is isolated between the corresponding main body part and the pole column hole;

[0013] The inner wall of the limiting member is provided with a matching groove; the cover plate comprises a second side and a first side opposite in the thickness direction;

[0014] The first flange portion is pressed against the second side of the cover plate, the second flange portion is pressed against the surface of the first side of the cover plate, and the outer peripheral surface of the first main body segment is partially embedded in the matching groove.

[0015] In one of the embodiments, one end of the second region along the axial direction of the pole column extends to the joint position of the first main body segment and the second main body segment, and the other end of the second region along the axial direction of the pole column extends to the joint position of the second main body segment and the first flange portion;

[0016] The distance between the joint position of the first main body segment and the second main body segment and the surface of the second side of the cover plate is greater than the distance between the surface of the first side of the cover plate and the surface of the second side.

[0017] In one of the embodiments, the top cover assembly further comprises a sealing ring, and the sealing ring is sleeved on the second main body segment;

[0018] The sealing ring comprises an inner peripheral sealing portion and an outer peripheral sealing portion connected in sequence from inside to outside in the radial direction; the inner peripheral sealing portion is clamped between the first flange portion and the limiting member, and the outer peripheral sealing portion is clamped between the first flange portion and the surface of the second side of the cover plate;

[0019] The thickness of the inner peripheral sealing portion along the axial direction of the pole column is smaller than that of the outer peripheral sealing portion.

[0020] In one of the embodiments, the second anti-rotation portion further comprises a second auxiliary anti-rotation surface arranged on the outer peripheral surface of the limiting member; one side surface of the cover plate is provided with an annular boss extending around the edge of the pole column hole;

[0021] The third anti-rotation portion comprises a third anti-rotation surface opposite to the second auxiliary anti-rotation surface, and a part of the third anti-rotation surface is located on the inner peripheral surface of the annular boss, and the other part of the third anti-rotation surface is located on the inner wall of the pole column hole.

[0022] In one of the embodiments, the limiting member comprises an isolation portion and a second flange portion connected to one end of the isolation portion, the isolation portion is isolated between the corresponding main body portion and the pole hole;

[0023] The second flange portion is wrapped outside the annular boss;

[0024] The third anti-rotation portion further comprises a third auxiliary anti-rotation surface arranged on the outer circumferential surface of the annular boss, the third auxiliary anti-rotation surface is located at the same position in the circumferential direction of the pole as the third anti-rotation surface;

[0025] The first auxiliary anti-rotation surface is arranged at a position on the second flange portion opposite to the third auxiliary anti-rotation surface, and the third auxiliary anti-rotation surface and the first auxiliary anti-rotation surface are in contact with each other.

[0026] In one of the embodiments, the number of the first anti-rotation surfaces is four, and the four first anti-rotation surfaces are uniformly distributed along the circumferential direction of the pole.

[0027] In one of the embodiments, the pole is a cold heading forming member.

[0028] The second aspect of the embodiments of the present application provides a battery monomer comprising the above-mentioned top cover assembly.

[0029] The third aspect of the embodiments of the present application provides a battery comprising the above-mentioned battery monomer.

[0030] The above-mentioned top cover assembly, battery monomer and battery have the following beneficial effects:

[0031] By configuring the first anti-rotation surface and the second anti-rotation surface as T-shaped surfaces, in the T-shaped surfaces, the length dimension of the first region in the first direction is greater than the length dimension of the second region in the first direction, due to the existence of the first region, the first anti-rotation surface and the second anti-rotation surface have a larger contact area in the first direction, since the first direction is parallel to the first region and perpendicular to the axial direction of the pole, the larger contact area of the first anti-rotation surface and the second anti-rotation surface in the first direction can better limit the mutual rotation of the pole and the limiting member in the circumferential direction, thereby improving the safety and reliability of the battery monomer and the battery. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 The exploded structural schematic diagram of the top cover assembly provided by the embodiments of the present application;

[0033] Figure 2 The structural schematic diagram of the pole in the top cover assembly provided by the embodiments of the present application;

[0034] Figure 3 The structural schematic diagram of the pole in the top cover assembly provided by the embodiments of the present application from another angle;

[0035] Figure 4 Partial sectional view of a top cover assembly provided by an embodiment of the present application;

[0036] Figure 5 Partial structural schematic view of a top cover assembly provided by an embodiment of the present application, in which a limiting member is separated out.

[0037] BRIEF DESCRIPTION OF DRAWINGS

[0038] 100, top cover assembly; 10, cover plate; 11, pole post hole; 12, annular boss; 13, third anti-rotation part; 131, third anti-rotation surface; 132, third auxiliary anti-rotation surface; 20, pole post; 21, first anti-rotation surface; 210, main body part; 211, first main body section; 2110, protruding part; 212, second main body section; 213, auxiliary section; 2130, step part; 220, first flange part; 30, limiting member; 301, matching groove; 3011, sub-groove section; 32, second anti-rotation part; 321, second anti-rotation surface; 322, second auxiliary anti-rotation surface; 330, isolation part; 340, second flange part; 341, first auxiliary anti-rotation surface; 350, extension part; 40, sealing ring; 41, inner circumferential sealing part; 42, outer circumferential sealing part;

[0039] F, first region; S, second region; E, first side; G, second side. DETAILED DESCRIPTION

[0040] In order to make the above-mentioned purposes, features and advantages of the present application more apparent and easy to understand, the specific embodiments of the present application will be described in detail below with reference to the drawings. In the following description, a large number of specific details are set forth in order to fully understand the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0041] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0042] In addition, the terms "first", "second", "third", etc. are used only for descriptive purposes and do not connote or imply any relative importance or an ordering between the indicated technical features. Thus, a feature defined with "first", "second", etc. can include at least one of the features explicitly or implicitly. In the description of the present application, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise explicitly and specifically limited.

[0043] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0044] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature. The first and second features can be in direct contact, or the first and second features can be in indirect contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0045] It should be noted that when an element is referred to as "fixed to" or "provided on" another element, it can be directly on the other element or there can be a middle element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there can be a middle element. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are only for illustrative purposes and do not represent the only implementation.

[0046] The top cover assembly, the battery monomer and the battery of the embodiments of the present application will be described below with reference to the accompanying drawings.

[0047] Figure 1 The exploded structural schematic diagram of the top cover assembly provided by the embodiments of the present application is provided. Figure 2 The structural schematic diagram of the pole column in the top cover assembly provided by the embodiments of the present application is provided. Figure 3 The structural schematic diagram of the pole column in the top cover assembly provided by the embodiments of the present application is provided. Figure 4A partial sectional view of a top cover assembly is provided for embodiments of the present application.

[0048] Referring to Figure 1 , Figure 2 , Figure 4 The top cover assembly 100 provided by the embodiments of the present application comprises a cover plate 10, at least one pole column 20, and at least one limiting piece 30. The cover plate 10 is provided with at least one pole column hole 11. Each pole column 20 is correspondingly inserted into the pole column hole 11 and insulated and separated from the corresponding pole column hole 11 by the limiting piece 30.

[0049] The first anti-rotation surface 21 is arranged at at least one position in the circumference of the pole column 20. The second anti-rotation part 32 and the third anti-rotation part 13 are respectively arranged at positions corresponding to the first anti-rotation surface 21 on the limiting piece 30 and the pole column hole 11. The first anti-rotation surface 21, the second anti-rotation part 32, and the third anti-rotation part 13 cooperate with each other to limit the relative rotation of the pole column 20, the limiting piece 30, and the pole column hole 11. The second anti-rotation part 32 comprises a second anti-rotation surface 321 arranged on the inner wall of the limiting piece 30 and opposite to the first anti-rotation surface 21.

[0050] The first anti-rotation surface 21 and the second anti-rotation surface 321 are both configured as T-shaped surfaces. The T-shaped surface comprises a first region F and a second region S in the same plane. The length dimension of the first region F along a first direction is greater than the length dimension of the second region S along the first direction. The first direction is parallel to the first region F and perpendicular to the axial direction of the pole column 20.

[0051] By configuring the first anti-rotation surface 21 and the second anti-rotation surface 321 as T-shaped surfaces, the length dimension of the first region F along the first direction is greater than the length dimension of the second region S along the first direction. Due to the existence of the first region F, the first anti-rotation surface 21 and the second anti-rotation surface 321 have a larger contact area in the first direction. Since the first direction is parallel to the first region F and perpendicular to the axial direction of the pole column 20, the larger contact area of the first anti-rotation surface 21 and the second anti-rotation surface 321 in the first direction can better limit the mutual rotation of the pole column 20 and the limiting piece 30 in the circumferential direction (the mutual torsion force of the pole column 20 and the limiting piece 30 is along the circumferential direction), thereby improving the safety and reliability of the battery monomer and the battery.

[0052] Here, the first anti-rotation surface 21 and the second anti-rotation surface 321 are opposite, which means that the T-shaped surface of the first anti-rotation surface 21 and the T-shaped surface of the second anti-rotation surface 321 are roughly aligned, mutually consistent, and cover each other.

[0053] It can be understood that each pole column 20 is correspondingly inserted into the pole column hole 11 and insulated and separated from the corresponding pole column hole 11 by the limiting piece 30, which means that each pole column 20 is correspondingly inserted into the pole column hole 11, and each limiting piece 30 is insulated and separated between a group of corresponding pole columns 20 and the hole wall of the pole column hole 11.

[0054] In the embodiments of the present application, in combination with Figure 2 and Figure 4 The pole column 20 comprises a main body part 210 which is inserted into the pole column hole 11; the main body part 210 comprises a first main body section 211 and a second main body section 212 which are connected along the axial direction of the pole column 20. The outer contour size of the first main body section 211 is larger than the outer contour size of the second main body section 212.

[0055] The first region F is located on the outer circumferential surface of the first main body section 211, and the second region S is located on the outer circumferential surface of the second main body section 212; the first region F and the second region S are sequentially connected along the axial direction of the pole column 20.

[0056] In this way, the first region F and the second region S which have different length sizes along the first direction can be arranged in one plane, and in actual production, the first region F and the second region S can be machined simultaneously through one process. In specific implementation, the first anti-rotation surface 21 can be parallel to the axial direction of the pole column 20.

[0057] Further, the main body part 210 further comprises an auxiliary section 213 which is arranged on the surface of the first main body section 211 which is away from the second main body section 212; the outer contour size of the auxiliary section 213 is smaller than the outer contour size of the first main body section 211, so as to form a stepped part 2130 at the joint position of the auxiliary section 213 and the first main body section 211.

[0058] The end part of the limiting part 30 along the axial direction of the pole column 20 is formed with an extension part 350 which is lapped on the stepped part 2130.

[0059] The auxiliary section 213 is a naturally formed structure section after the partial material of the end part of the main body part 210 is plastically extruded to form the first main body section 211 in the process of cold heading to form the first main body section 211. The end part of the limiting part 30 along the axial direction of the pole column 20 is formed with the extension part 350 which can be lapped on the stepped part 2130, so as to shield the matching position of the first anti-rotation surface 21 and the second anti-rotation surface 321.

[0060] In the embodiments of the present application, in combination with Figure 2 and Figure 4 The pole column 20 further comprises a first flange part 220 which is connected to the end part of the second main body section 212 which is away from the first main body section 211.

[0061] The limiting part 30 comprises an isolation part 330 and a second flange part 340 which is connected to one end of the isolation part 330; the isolation part 330 is isolated between the corresponding main body part 210 and the pole column hole 11.

[0062] The inner wall of the limiting piece 30 is provided with a matching groove 301, and the cover plate 10 includes a second side G and a first side E opposite in the thickness direction. The first flange portion 220 abuts against the second side G of the cover plate 10, the second flange portion 340 abuts against the surface of the first side E of the cover plate 10, and the outer peripheral surface portion structure of the first main body section 211 is embedded in the matching groove 301.

[0063] Since the first flange portion 220 abuts against the second side G of the cover plate 10, the freedom of movement of the pole piece 20 towards the first side E is limited by the cover plate 10 and the pole piece 20 cannot move towards the first side E. Since the second flange portion 340 abuts against the surface of the first side E of the cover plate 10, the freedom of movement of the limiting piece 30 towards the second side G is also limited by the cover plate 10 and the limiting piece 30 cannot move towards the second side G.

[0064] By embedding the outer peripheral surface portion structure of the first main body section 211 in the matching groove 301, when the pole piece 20 has a movement trend towards the second side G, since the movement of the first main body section 211 towards the second side G is limited by the limiting piece 30 which cannot move towards the second side G, this makes the pole piece 20 also unable to move towards the second side G. When the limiting piece 30 has a movement trend towards the first side E, since the outer peripheral surface portion structure of the first main body section 211 is embedded in the matching groove 301, the movement of the groove wall of the matching groove 301 towards the first side E is limited by the first main body section 211 which cannot move towards the first side E, which makes the limiting piece 30 also unable to move towards the first side E. In this way, interlocking functions are achieved between the pole piece 20 and the limiting piece 30, so that the pole piece 20 and the limiting piece 30 can be relatively fixed with the cover plate 10.

[0065] Of course, referring again to Figure 1 and Figure 2 , at least one protruding portion 2110 extending around the circumference of the pole piece 20 is arranged on the outer surface of the first main body section 211, one protruding portion 2110 can be arranged between every two adjacent first anti-rotation surfaces 21, the matching groove 301 corresponding to each protruding portion 2110 includes a plurality of sub-groove sections 3011, and the embedding of the outer peripheral surface portion structure of the first main body section 211 in the matching groove 301 can refer to the embedding of each protruding portion 2110 in the corresponding sub-groove section 3011.

[0066] In the embodiments of the present application, in combination with Figure 2 and Figure 4 , the second region S extends to the junction position of the first main body section 211 and the second main body section 212 along one end of the axial direction of the pole piece 20, and extends to the junction position of the second main body section 212 and the first flange portion 220 along the other end of the axial direction of the pole piece 20.

[0067] The distance between the junction position of the first main body section 211 and the second main body section 212 and the surface of the second side G of the cover plate 10 is greater than the distance between the surface of the first side E and the surface of the second side G of the cover plate 10.

[0068] In this way, the first body section 211 is arranged at a higher position, the second body section 212 is arranged as large as possible along the axial direction of the pole post 20, the second region S is arranged as long as possible along the axial direction of the pole post 20, and the first anti-rotation surface 21 is arranged as large as possible.

[0069] Further, with reference to 1 and Figure 4 The top cover assembly 100 further comprises a sealing ring 40, which is sleeved on the second body section 212.

[0070] The sealing ring 40 comprises an inner circumferential sealing portion 41 and an outer circumferential sealing portion 42 connected in sequence from inside to outside along the radial direction; the inner circumferential sealing portion 41 is clamped between the first flange portion 220 and the limiting member 30, and the outer circumferential sealing portion 42 is clamped between the first flange portion 220 and the surface of the second side G of the cover plate 10. The thickness of the inner circumferential sealing portion 41 along the axial direction of the pole post 20 is smaller than that of the outer circumferential sealing portion 42.

[0071] In this way, on the one hand, the first flange portion 220 and the cover plate 10 can pre-compress the outer circumferential sealing portion 42 during the assembly of the top cover assembly 100 before the limiting member 30 is formed, and on the other hand, the part of the injection-molded limiting member 30 between the first flange portion 220 and the first body section 211 can be thicker, so that the pole post 20 and the limiting member 30 have better anti-torsion performance.

[0072] Figure 5 The partial structure diagram of the limiting member separated from the top cover assembly provided in the embodiments of the present application. In order to facilitate observation, Figure 5 In the partial structure diagram, the limiting member 30 is separated out, and the limiting member 30 is rotated by a certain angle relative to the cover plate 10, so as to facilitate observation of the structure of the lower part of the limiting member 30.

[0073] In the embodiments of the present application, with reference to Figure 5 The second anti-rotation portion 32 further comprises a second auxiliary anti-rotation surface 322 arranged on the outer circumferential surface of the limiting member 30. One side surface of the cover plate 10 is provided with an annular boss 12 extending around the edge of the pole post hole 11.

[0074] The third anti-rotation portion 13 comprises a third anti-rotation surface 131 opposite to the second auxiliary anti-rotation surface 322, and the third anti-rotation surface 131 is partially arranged on the inner circumferential surface of the annular boss 12 and the other part of the third anti-rotation surface 131 is arranged on the inner wall of the pole post hole 11. In this way, the area of the third anti-rotation surface 131 is increased, so that the anti-rotation effect is better.

[0075] Of course, in specific implementation, the second auxiliary anti-rotation surface 322 and the second anti-rotation surface 321 are arranged at the same position in the circumferential direction of the limiting member 30, so as to make the anti-rotation effect optimal.

[0076] In combination Figure 4 and Figure 5 The limiting member 30 includes an isolation portion 330 and a second flange portion 340 connected to one end of the isolation portion 330, the isolation portion 330 is isolated between the corresponding main body portion 210 and the pole hole 11, and the second flange portion 340 is wrapped on the outside of the annular boss 12.

[0077] The third anti-rotation portion 13 further includes a third auxiliary anti-rotation surface 132 provided on the outer circumferential surface of the annular boss 12, and the third auxiliary anti-rotation surface 132 is located at the same position in the circumferential direction of the pole 20 as the third anti-rotation surface 131.

[0078] The first auxiliary anti-rotation surface 341 is provided at a position on the second flange portion 340 opposite the third auxiliary anti-rotation surface 132, and the third auxiliary anti-rotation surface 132 and the first auxiliary anti-rotation surface 341 are in contact with each other.

[0079] In this way, an anti-rotation structure is also provided between the second flange portion 340 and the annular boss 12, so that the anti-rotation effect is better.

[0080] Further, in combination Figure 3 and Figure 5 The number of the first anti-rotation surfaces 21 is four, and the four first anti-rotation surfaces 21 are uniformly distributed in the circumferential direction of the pole 20.

[0081] In this way, the pole 20 is subjected to the force of the limiting member 30 at four positions in the circumferential direction, which is more uniform, and the anti-rotation effect is better. Of course, in the case where the number of the first anti-rotation surfaces 21 is four, the number of the second anti-rotation portions 32 and the third anti-rotation portions 13 corresponding thereto is also four.

[0082] In addition, in the embodiment of the application, the pole 20 is a cold heading formed part. This makes the cost of the pole 20 lower.

[0083] The second aspect of the embodiment of the application also provides a battery monomer and a battery, the battery monomer comprising the top cover assembly described above. The structure, function, working principle, etc. of the top cover assembly have been described in detail above, and will not be described here.

[0084] The battery comprises a battery monomer, and the battery can refer to a battery pack, and the battery pack comprises a plurality of battery monomers. Alternatively, the battery can also refer to a battery pack, and the battery pack comprises a plurality of grouped battery packs.

[0085] The technical features of the above-described embodiments can be combined in any manner. In order to make the description concise, not all possible combinations of the technical features in the above-described embodiments are described, however, as long as the combinations of the technical features do not exist contradictions, they should be considered as the scope of the description.

[0086] The above-described embodiments only express several implementation manners of the utility model, the description is more specific and detailed, but can not therefore be understood as the limitation of the utility model patent range. It should be pointed out that for ordinary skilled person in the art, without departing from the concept of the utility model, several modifications and improvements can be made, which belong to the protection range of the utility model. Therefore, the protection range of the utility model patent should be subject to the appended claims.

Claims

1. A cap assembly, characterized by, The top cover assembly comprises a cover plate, at least one pole column and at least one limiting piece, the cover plate is provided with at least one pole column hole, each pole column is inserted into the pole column hole one by one, and the limiting piece is insulated and separated from the corresponding pole column hole; The pole column is provided with a first anti-rotation surface at least at one position in the circumferential direction, the limiting piece and the position corresponding to the first anti-rotation surface on the pole column hole are respectively provided with a second anti-rotation part and a third anti-rotation part, and the first anti-rotation surface, the second anti-rotation part and the third anti-rotation part are matched to limit the relative rotation of the pole column, the limiting piece and the pole column hole; the second anti-rotation part comprises a second anti-rotation surface arranged on the inner wall of the limiting piece and opposite to the first anti-rotation surface; The first anti-rotation surface and the second anti-rotation surface are both configured as T-shaped surfaces, the T-shaped surface comprises a first region and a second region in the same plane, the length dimension of the first region in the first direction is greater than that of the second region; the first direction is parallel to the first region and perpendicular to the axial direction of the pole column. The pole column comprises a main body part, the main body part is inserted into the pole column hole; the main body part comprises a first main body segment and a second main body segment connected in the axial direction of the pole column; the outer contour dimension of the first main body segment is greater than that of the second main body segment; 2. The roof assembly of claim 1, wherein, The first region is located on the outer peripheral surface of the first main body segment, the second region is located on the outer peripheral surface of the second main body segment, and the first region and the second region are sequentially connected in the axial direction of the pole column. The main body part further comprises an auxiliary segment arranged on the surface of the first main body segment away from the second main body segment, the outer contour dimension of the auxiliary segment is smaller than that of the first main body segment, so as to form a stepped part at the joint position of the auxiliary segment and the first main body segment; 3. The roof assembly of claim 2, wherein, The end of the limiting piece in the axial direction of the pole column is formed with an extension part, and the extension part is lapped on the stepped part. The pole column further comprises a first flange part connected to the end of the second main body segment away from the first main body segment; 4. The roof assembly of claim 2, wherein, The limiting piece comprises an isolation part and a second flange part connected to one end of the isolation part, and the isolation part is isolated between the corresponding main body part and the pole column hole; The inner wall of the limiting piece is provided with a matching groove; the cover plate comprises a second side and a first side opposite in the thickness direction; The first flange part is pressed against the second side of the cover plate, the second flange part is pressed against the surface of the first side of the cover plate, and the outer peripheral surface of the first main body segment is partially embedded in the matching groove. The second region extends to the joint position of the first main body segment and the second main body segment at one end in the axial direction of the pole column, and extends to the joint position of the second main body segment and the first flange part at the other end in the axial direction of the pole column; 5. The roof assembly of claim 4, wherein, The distance between the joint position of the first main body segment and the second main body segment and the surface of the second side of the cover plate is greater than the distance between the surface of the first side of the cover plate and the surface of the second side. The top cover assembly further comprises a sealing ring, and the sealing ring is sleeved on the second main body segment.

6. The roof assembly of claim 4, wherein, ​ The sealing ring comprises an inner circumferential sealing part and an outer circumferential sealing part connected in sequence from inside to outside along the radial direction; the inner circumferential sealing part is clamped between the first flange part and the limiting part, and the outer circumferential sealing part is clamped between the first flange part and the surface of the second side of the cover plate. The thickness of the inner circumferential sealing part along the axial direction of the pole column is less than that of the outer circumferential sealing part.

7. The roof assembly of claim 2 or 3, wherein, The second anti-rotation part further comprises a second auxiliary anti-rotation surface arranged on the outer circumferential surface of the limiting part; one side surface of the cover plate is provided with an annular boss extending around the edge of the pole column hole. The third anti-rotation part comprises a third anti-rotation surface opposite to the second auxiliary anti-rotation surface, and a part of the third anti-rotation surface is located on the inner circumferential surface of the annular boss, and the other part of the third anti-rotation surface is located on the inner wall of the pole column hole.

8. The roof assembly of claim 4 or 5 or 6, wherein, The second anti-rotation part further comprises a second auxiliary anti-rotation surface arranged on the outer circumferential surface of the limiting part; one side surface of the cover plate is provided with an annular boss extending around the edge of the pole column hole. The third anti-rotation part comprises a third anti-rotation surface opposite to the second auxiliary anti-rotation surface, and a part of the third anti-rotation surface is located on the inner circumferential surface of the annular boss, and the other part of the third anti-rotation surface is located on the inner wall of the pole column hole.

9. The roof assembly of claim 7, wherein, The limiting part comprises an isolation part and a second flange part connected to one end of the isolation part, and the isolation part is isolated between the corresponding main body part and the pole column hole. The second flange part is wrapped on the outside of the annular boss. The third anti-rotation part further comprises a third auxiliary anti-rotation surface arranged on the outer circumferential surface of the annular boss, and the third auxiliary anti-rotation surface is located at the same position as the third anti-rotation surface in the circumferential direction of the pole column. A first auxiliary anti-rotation surface is arranged on the second flange part opposite to the third auxiliary anti-rotation surface, and the third auxiliary anti-rotation surface and the first auxiliary anti-rotation surface are in contact with each other.

10. The roof assembly of claim 8, wherein, The second flange part is wrapped on the outside of the annular boss. The third anti-rotation part further comprises a third auxiliary anti-rotation surface arranged on the outer circumferential surface of the annular boss, and the third auxiliary anti-rotation surface is located at the same position as the third anti-rotation surface in the circumferential direction of the pole column. A first auxiliary anti-rotation surface is arranged on the second flange part opposite to the third auxiliary anti-rotation surface, and the third auxiliary anti-rotation surface and the first auxiliary anti-rotation surface are in contact with each other.

11. The roof assembly of any one of claims 1-6, wherein, The number of the first anti-rotation surfaces is four, and the four first anti-rotation surfaces are uniformly distributed along the circumferential direction of the pole column.

12. The roof assembly of any one of claims 1-6, wherein, The pole column is a cold heading formed part.

13. A battery cell, characterized by The top cover assembly comprises at least one battery monomer.

14. A battery, characterized by The battery comprises at least one battery monomer.

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