Top cover assembly, battery cell, battery pack, and electric device

Abstract

A top cover assembly, a battery cell, a battery pack (100), and an electric device, relating to the technical field of batteries. According to the top cover assembly, the space occupied by a top cover assembly in a battery can be reduced, thereby increasing the volumetric energy density of the battery. The top cover assembly comprises: a top cover component (1), poles (2), and adapters (3). Mounting through holes are formed in the top cover component (1). Each pole (2) comprises a connecting part (21) and an abutting part (22); the connecting part (21) matches the corresponding mounting through hole and the connecting part (21) passes through the corresponding mounting through hole; the abutting part (22) extends from one end of the connecting part (21) in the radial direction of the connecting part (21); the abutting part (22) abuts against the side of the top cover component (1) facing the interior of a battery; in the radial direction of the connecting part (21), the corresponding adapter (3) is located on one side of the pole (2), one end of the adapter (3) is electrically connected to one side of the abutting part (22), and the other end of the adapter (3) is electrically connected to a tab (41) of a cell (4). The top cover assembly is used in battery cells.

Description

Top cover assembly, battery monomer, battery pack and electric device

[0001] Cross-reference to related applications

[0002] The present disclosure is based on and claims priority to Chinese Patent Application No. 202420716996.5, filed on April 9, 2024, entitled "Top cover assembly, battery monomer, battery pack and electric device", the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0003] The present disclosure relates to the technical field of batteries, and in particular to a top cover assembly, a battery monomer, a battery pack and an electric device. BACKGROUND

[0004] New energy batteries are increasingly widely used in life and industry. For example, new energy vehicles equipped with batteries have been widely used, and batteries are also increasingly used in the field of energy storage and the like.

[0005] In the case of a determined volume of the battery, the producer and the user and the like all hope that the energy density of the battery is as high as possible, which requires that the space occupied by the top cover part in the battery is as small as possible. In the related art, the adapter sheet electrically connecting the pole post on the top cover and the pole tab on the battery cell needs to occupy a large space of the top cover part, which is not conducive to the improvement of the volume energy density of the battery.

[0006] SUMMARY

[0007] The present disclosure provides a top cover assembly, a battery monomer, a battery pack and an electric device, which can reduce the space occupied by the top cover assembly in the battery and is conducive to improving the volume energy density of the battery.

[0008] A first aspect of the present disclosure provides a top cover assembly, comprising: a top cover component, a pole post and an adapter piece; wherein the top cover component is provided with a mounting through hole; the pole post comprises a connecting part and an abutting part, the connecting part is adapted to the mounting through hole and is arranged in the mounting through hole, the abutting part is formed by extending from one end of the connecting part along the radial direction of the connecting part, and the abutting part abuts against one side of the top cover component facing the inside of the battery; in the radial direction of the connecting part, the adapter piece is located on one side of the pole post, one end of the adapter piece is electrically connected to one side of the abutting part, and the other end of the adapter piece is used for electrically connecting to the pole tab of the battery cell.

[0009] The top cover assembly provided by the present disclosure can form a closed containing space by the top cover assembly and the shell of the battery due to the arrangement of the top cover assembly and the mounting through hole arranged on the top cover assembly. The connecting part adapted to the mounting through hole is arranged on the pole post, and the connecting part can be arranged in the mounting through hole so as to extend the pole post to the outside of the battery through the mounting through hole. The abutting part is arranged at one end of the connecting part, and the position of the pole post relative to the top cover assembly can be limited by the abutting part and the top cover assembly during the process of passing the connecting part through the mounting through hole. Meanwhile, the adapter is electrically connected to one side of the abutting part in the radial direction of the connecting part, so that the surface of the adapter close to the top cover assembly is abutted with the top cover assembly. In this way, the top cover assembly, the pole post and the adapter can be abutted with each other in the axial direction of the connecting part, so that the space occupied by the adapter can be reduced, and the space occupied by the top cover assembly in the battery can be reduced, which is beneficial to improve the volume energy density of the battery.

[0010] In a possible implementation manner of the present disclosure, the pole post further comprises an extension part, which is formed from one side of the abutting part in the radial direction of the connecting part. The extension part and the side of the top cover assembly facing the inside of the battery form a mounting gap, and one end of the adapter is located in the mounting gap.

[0011] In the technical solution of the present disclosure, the extension part formed from one side of the abutting part is arranged on the pole post, and the mounting gap is formed between the extension part and the top cover assembly. One end of the adapter is located in the mounting gap to abut the adapter with the top cover assembly. The connecting area of the adapter and the pole post can be increased by the extension part, which is beneficial to improve the reliability of the electrical connection between the adapter and the pole post.

[0012] In a possible implementation manner of the present disclosure, the abutting surface on the abutting part is located closer to the top cover assembly than the extension surface on the extension part in the axial direction of the connecting part. The abutting surface is the surface of the abutting part close to the connecting part, and the extension surface is the surface of the extension part close to the connecting part.

[0013] In the technical solution of the present disclosure, the abutting surface on the abutting part is located closer to the top cover assembly than the extension surface on the extension part. After the pole post is installed on the top cover assembly through the mounting through hole, a certain distance is formed between the extension part and the top cover assembly, so that the required mounting gap is formed between the extension part and the top cover assembly.

[0014] In a possible implementation manner of the present disclosure, the thickness of the extension part is smaller than the thickness of the abutting part in the axial direction of the connecting part, and the surface of the abutting part away from the connecting part and the surface of the extension part away from the connecting part are located on the same plane.

[0015] In the technical scheme of the present disclosure, since the surface of the abutting portion away from the connecting portion and the surface of the extending portion away from the connecting portion are in the same plane, and the extending portion is thinner than the abutting portion, not only can the mounting gap be formed between the extending portion and the top cover assembly, but also the surface of the pole away from the top cover assembly can be easily processed.

[0016] In a possible implementation manner of the present disclosure, the top cover assembly comprises a top cover sheet, and the mounting through hole comprises a first through hole arranged on the top cover sheet.

[0017] In the technical scheme of the present disclosure, since the top cover sheet is arranged in the top cover assembly, the top cover sheet can be fixedly connected with the opening on the shell in the battery to form a sealed space for chemical reaction in the battery. Meanwhile, the first through hole is arranged on the top cover sheet, so that the connecting portion of the pole can be passed out of the first through hole, and the pole can extend to the outside of the battery.

[0018] In a possible implementation manner of the present disclosure, the top cover assembly further comprises a first insulating member matched with the top cover sheet, the first insulating member is arranged on the side of the top cover sheet close to the extending portion, and the mounting through hole comprises a second through hole arranged on the first insulating member. The first insulating member is arranged between the pole and the top cover sheet through the second through hole to insulate the current between the pole and the top cover sheet.

[0019] In the technical scheme of the present disclosure, since the first insulating member matched with the top cover sheet is arranged in the top cover assembly, the first insulating member can be arranged on the side of the top cover sheet facing the inside of the battery, so that the current between the top cover sheet and the pole can be insulated by the first insulating member, and the current between the top cover sheet and the battery cell can also be insulated by the first insulating member.

[0020] In a possible implementation manner of the present disclosure, the side of the first insulating member close to the extending portion is provided with a pressing portion, and the pressing portion is used to apply a force to the adapter towards the extending portion.

[0021] In the technical scheme of the present disclosure, since the pressing portion is arranged on the first insulating member, during the assembly of the adapter and the pole, the pressing portion can be used to apply a force to the adapter towards the extending portion of the pole, so as to fix the adapter with the pole, so that the adapter can be in a determined position relative to the pole, and the adapter and the pole can be welded.

[0022] In a possible implementation manner of the present disclosure, the top cover assembly further comprises a fixing member, the fixing member is provided with a first connecting structure, and the end of the connecting portion away from the extending portion is provided with a second connecting structure matched with the first connecting structure. The fixing member is located on the side of the top cover sheet away from the extending portion, and the first connecting structure is connected with the second connecting structure to fixedly connect the pole with the top cover assembly.

[0023] In the technical solution of the present disclosure, the fixing member is arranged in the top cover assembly, and the matched first connecting structure and the second connecting structure are arranged on the fixing member and the connecting portion of the pole respectively, so that the fixing member and the connecting portion are fixedly connected through the first connecting structure and the second connecting structure, thereby facilitating the fixed connection of the pole and the top cover assembly.

[0024] In a possible implementation manner of the present disclosure, the top cover assembly further comprises a second insulating member, and the mounting through hole comprises a third through hole arranged on the second insulating member, the second insulating member is arranged between the fixing member and the top cover sheet through the third through hole, so as to isolate the current between the fixing member and the top cover sheet.

[0025] In the technical solution of the present disclosure, the second insulating member is arranged between the fixing member and the top cover sheet, so that the current between the fixing member and the top cover sheet is isolated through the second insulating member. Meanwhile, the third through hole is arranged on the second insulating member, so that the connecting portion of the pole extends to the side of the top cover sheet away from the abutting portion through the third through hole.

[0026] In a possible implementation manner of the present disclosure, the top cover assembly further comprises a sealing member, and the mounting through hole comprises a fourth through hole arranged on the sealing member, the sealing member is arranged between the connecting portion and the first through hole through the fourth through hole.

[0027] In the technical solution of the present disclosure, the sealing member is arranged between the top cover sheet and the pole, and the fourth through hole is arranged on the sealing member, so that the sealing member is sleeved on the connecting portion of the pole, and the sealing member is compressed by the top cover sheet and the pole, thereby sealing the gap between the first through hole on the top cover sheet and the pole.

[0028] The second aspect of the present disclosure provides a battery monomer, comprising: an electric core, a shell and the top cover assembly provided by any one of the above embodiments; wherein the electric core has a tab; the shell has a containing cavity matched with the electric core, and the electric core is installed in the containing cavity; the top cover assembly is connected with the opening of the containing cavity, and the other end of the adapter is electrically connected with the tab.

[0029] The battery monomer provided by the present disclosure can reduce the space occupied by the adapter, and further reduce the space occupied by the top cover assembly in the battery monomer, which is beneficial to improve the volume energy density of the battery monomer.

[0030] The third aspect of the present disclosure provides a battery pack, comprising: a box body and the battery monomer provided by the second aspect; wherein the box body has a mounting cavity; and the battery monomer is arranged in the mounting cavity.

[0031] The battery pack provided by the embodiments of the present disclosure can reduce the space occupied by the adapter in the top cover assembly of the battery monomer, thereby reducing the space occupied by the top cover assembly in the battery monomer, and further improving the volumetric energy density of the battery monomer, which is conducive to improving the volumetric energy density of the battery pack.

[0032] The fourth aspect of the present disclosure provides a power utilization device, which comprises the battery monomer provided by the second aspect or the battery pack provided by the third aspect.

[0033] The power utilization device provided by the present disclosure can reduce the space occupied by the adapter in the top cover assembly of the battery monomer, thereby reducing the space occupied by the top cover assembly in the battery monomer, and further improving the volumetric energy density of the battery monomer, which is conducive to improving the volumetric energy density of the battery pack, thereby prolonging the power supply time of the battery monomer or the battery pack to the power utilization device. BRIEF DESCRIPTION OF DRAWINGS

[0034] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings are included to provide a description of the preferred embodiments and are not intended to limit the scope of the present disclosure. Moreover, like reference numerals designate like parts throughout the several views in the drawings. In the drawings:

[0035] FIG. 1 is a perspective exploded view of a battery monomer provided by the present disclosure;

[0036] FIG. 2 is a cross-sectional structural view of the battery monomer provided by the present disclosure;

[0037] FIG. 3 is a partial enlarged view of portion B in FIG. 2 provided by the present disclosure;

[0038] FIG. 4 is a partial cross-sectional view of portion B in FIG. 2 provided by the present disclosure, which forms a mounting gap;

[0039] FIG. 5 is a schematic view of a pole in a top cover assembly provided by the present disclosure;

[0040] FIG. 6 is an exploded view of the top cover assembly provided by the present disclosure;

[0041] FIG. 7 is a schematic view of a first insulating member in the top cover assembly provided by the present disclosure;

[0042] FIG. 8 is a perspective exploded view of a battery pack provided by the present disclosure;

[0043] FIG. 9 is a structural schematic view of a power utilization device provided by the present disclosure;

[0044] REFERENCE SIGNS

[0045] 1-top cover assembly; 11-top cover sheet; 111-first through hole; 12-first insulating member; 121-second through hole; 122-pressing portion; 13-fixing member; 131-first connecting structure; 14-second insulating member; 141-third through hole; 15-sealing member; 151-fourth through hole; 2-pole; 21-connecting portion; 211-second connecting structure; 22-abutting portion; 221-abutting surface; 23-extension portion; 231-extension surface; 3-adapter; 4-battery cell; 41-ear; 5-shell; 6-case; 7-cover; 8-battery module; 100-battery pack; 200-controller; 300-motor; A-axial direction; R-radial direction; G-installation gap. DETAILED DESCRIPTION

[0046] The following embodiments of the technical solution of the present disclosure are described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present disclosure and are therefore only examples and are not intended to limit the scope of protection of the present disclosure.

[0047] Unless otherwise defined, all technical and scientific terms used herein have the same meanings as commonly understood by those skilled in the art to which the present disclosure belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present disclosure; the terms "including" and "having" and any variations thereof in the specification of the present disclosure and the above-mentioned drawings are intended to cover non-exclusive inclusions.

[0048] In the description of the embodiments of the present disclosure, technical terms such as "first," "second," and "third" are used solely to distinguish different objects and should not be understood to indicate or imply relative importance or to implicitly specify the quantity, specific order, or primary and secondary relationship of the technical features indicated. In the description of the embodiments of the present disclosure, "plurality" means more than two, unless otherwise specifically defined.

[0049] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present disclosure. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0050] In the description of the embodiments of the present disclosure, the term "and / or" is merely an association relationship of associated objects, and can represent three relationships, for example, X and / or Y, which can represent three cases of X existing alone, X and Y existing together, and Y existing alone. In addition, the character " / " herein generally represents an "or" relationship between the associated objects before and after it.

[0051] In the description of the embodiments of the present disclosure, the orientations or positional relationships indicated by the technical terms "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "circumferential", and the like are based on the orientations or positional relationships shown in the drawings, and are merely for the convenience of describing the embodiments of the present disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed, operated or used in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present disclosure.

[0052] In the description of the embodiments of the present disclosure, unless otherwise explicitly specified and limited, the technical terms "mounting", "connection", "connection", "fixing", and the like should be understood in a broad sense, for example, can be fixed connection, or detachable connection, or integral; can be mechanical connection, or electrical connection; can be direct connection, or indirect connection through an intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meanings of the above terms in the embodiments of the present disclosure can be understood according to the specific circumstances.

[0053] In the description of the embodiments of the present disclosure, unless otherwise explicitly specified and limited, the technical term "contact" should be understood in a broad sense, which can be direct contact or contact through an intermediate medium layer, and can be contact between two objects in contact without interaction force, or contact between two objects in contact with interaction force.

[0054] At present, new energy batteries are more and more widely used in life and industry. New energy batteries are not only applied to energy storage power supply systems such as hydroelectric, thermal, wind and solar power stations, but also widely used in electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, and aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also increasing.

[0055] No matter what kind of device or apparatus the battery is applied to, it is desirable for the battery to have a longer continuous power supply time. In the case where the volume or mass of the battery is determined, the greater the volume energy density or mass energy density of the battery, the longer the continuous power supply time of the battery. Therefore, in the case where the volume of the battery is determined, the greater the volume of the cell that generates an electrochemical reaction to provide electric energy in the battery, the more conducive to improving the continuous power supply time of the battery. Then, the space occupied by other components in the battery can be reduced as much as possible, so that the volume of the cell is larger.

[0056] The battery generally includes a shell, a cell accommodated in the shell, and a top cover assembly sealingly connected with the shell. The top cover assembly includes a plurality of parts, which are collectively composed of the top cover assembly through electrical connection or insulating connection between the parts. In the related art, one end of the adapter piece in the top cover assembly is fixed to one end of the pole close to the cell, which is easy to cause a gap between the other end of the adapter piece and the top cover piece and other parts in the top cover assembly, so that there is unused space inside the battery, thereby affecting the volume energy density of the battery.

[0057] Embodiments of the present disclosure provide a top cover assembly applied to a battery, which can reduce the space occupied by the top cover part in the battery and is conducive to improving the volume energy density of the battery. Referring to FIG. 1, FIG. 2 and FIG. 3, FIG. 1 shows a perspective exploded view of a battery monomer provided by the present disclosure, FIG. 2 shows a cross-sectional structure view of the battery monomer provided by the present disclosure, and FIG. 3 shows a partial enlarged view of part B in FIG. 2 provided by the present disclosure.

[0058] The top cover assembly provided by the embodiments of the present disclosure includes a top cover assembly 1, a pole 2 and an adapter piece 3. The top cover assembly 1 is provided with a mounting through hole. The pole 2 includes a connecting part 21 and an abutting part 22. The connecting part 21 is adapted to the mounting through hole and is arranged in the mounting through hole. The abutting part 22 is formed by extending from one end of the connecting part 21 along the radial direction R of the connecting part 21, and the abutting part 22 abuts against one side of the top cover assembly 1 facing the inside of the battery. In the radial direction R of the connecting part 21, the adapter piece 3 is located on one side of the pole 2, and one end of the adapter piece 3 is electrically connected to one side of the abutting part 22. The other end of the adapter piece 3 is used for electrically connecting to the tab 41 of the cell 4.

[0059] In the embodiments of the present disclosure, the top cover assembly 1 can be connected with the shell 5 of the battery monomer, that is, the top cover assembly 1 is installed at the opening position on the shell 5, and a closed space can be formed by the top cover assembly 1 and the shell 5, and the cell 4 in the battery can be accommodated in the closed space. The top cover assembly 1 can include a structural part for fixed connection with the shell 5, and other parts such as an insulating part for isolating the current between the cell 4 and the structural part.

[0060] For example, a mounting hole can be provided on the top cover assembly 1 to facilitate extending a portion of the pole 2 electrically connecting the cell 4 from the mounting hole to outside of the battery. For example, a hole adapted to the pole 2 can be provided on each part of the top cover assembly 1 adjacent to the pole 2.

[0061] In the embodiments of the present disclosure, the pole 2 is used to be electrically connected with the busbar or the external conductor of the battery. For example, one end of the pole 2 can be directly electrically connected with the busbar, the other end of the pole 2 can be electrically connected with the external conductor, or electrically connected with one pole of the adjacent battery cell in the battery pack.

[0062] For example, as shown in FIG. 3, the pole 2 can be provided in a structure including a connecting portion 21 and an abutting portion 22. The connecting portion 21 is provided in a structure adapted to the mounting hole on the top cover assembly 1, that is, the pole 2 can be assembled with the top cover assembly 1 through the connecting portion 21 and the mounting hole. For example, in the case of a cylindrical hole as the mounting hole, the connecting portion 21 can be provided in a cylindrical shape with a diameter smaller than that of the cylindrical hole, and then the cylindrical connecting portion 21 can be inserted through the mounting hole to connect the pole 2 with the top cover assembly 1.

[0063] For another example, the abutting portion 22 on the pole 2 can be provided at one end of the connecting portion 21 to facilitate limiting the position of the pole 2 relative to the top cover assembly 1 through the abutting portion 22. For example, the abutting portion 22 can be provided in a sheet-like structure, such as a quadrilateral sheet-like structure. In the radial direction R along the connecting portion 21, the radial dimension of the sheet-like abutting portion 22 is greater than that of the connecting portion 21, and then the abutting portion 22 can be abutted with the top cover assembly 1 to limit the position of the pole 2 relative to the top cover assembly 1.

[0064] In the embodiments of the present disclosure, the adapter 3 is used to electrically connect the pole 2 and the tab 41 on the cell 4 in the battery cell, that is, one part of the adapter 3 is electrically connected with the tab 41, and the other part is electrically connected with the pole 2. For example, as shown in FIG. 1, the adapter 3 can be made of a metal material, such as copper, aluminum or alloy. The adapter 3 can be provided in a long strip-like sheet-like structure.

[0065] As shown in FIG. 3, for example, the adapter 3 can be located on one side of the pole 2 in the radial direction R of the connecting portion 21 (in the length direction of the long strip-shaped adapter 3), that is, in the axial cross section perpendicular to the radial direction R of the connecting portion 21 (perpendicular to the paper and parallel to the axial direction A of the connecting portion 21 of the pole 2), all parts of the adapter 3 are located on one side of the axial cross section of the connecting portion 21. In this way, one side of the adapter 3 and one side of the abutting portion 22 on the pole 2 can be electrically connected by welding or the like to achieve electrical connection between the adapter 3 and the pole 2. By electrically connecting one side of the adapter 3 and the abutting portion 22, the distance between the adapter 3 and the top cover assembly 1 can be adjusted in the axial direction A of the connecting portion 21 of the pole 2, so that the adapter 3 can be abutted with the top cover assembly 1. For example, the surface of the adapter 3 close to the top cover assembly 1 and the surface of the abutting portion 22 close to the top cover assembly 1 are located in the same plane or close to the same plane, so that the adapter 3 can also abut with the top cover assembly 1.

[0066] In another example, one end of the adapter 3 away from the pole 2 can be electrically connected with the tab 41 of the battery cell 4. For example, the surface of the adapter 3 away from the top cover assembly 1 can be electrically connected with the tab 41 of the battery cell 4, so as to achieve electrical connection between the tab 41 and the pole 2.

[0067] The top cover assembly provided by the embodiments of the present disclosure can form a closed containing space enclosed by the top cover assembly 1 and the shell 5 of the battery, because the top cover assembly 1 is provided with a mounting through hole, and the connecting portion 21 adapted to the mounting through hole is arranged on the pole 2. The connecting portion 21 can be arranged in the mounting through hole, so as to extend the pole 2 to the outside of the battery through the mounting through hole. The abutting portion 22 is arranged at one end of the connecting portion 21, which can limit the position of the pole 2 relative to the top cover assembly 1 by abutting with the top cover assembly 1 during the process of passing the connecting portion 21 through the mounting through hole. Meanwhile, the adapter 3 is electrically connected with one side of the abutting portion 22 in the radial direction R of the connecting portion 21, so that the surface of the adapter 3 close to the top cover assembly 1 can be abutted with the top cover assembly 1. In this way, the top cover assembly 1, the pole 2 and the adapter 3 can be abutted with each other in the axial direction A of the connecting portion 21, so as to reduce the space occupied by the adapter 3, and further reduce the space occupied by the top cover assembly in the battery, which is beneficial to improve the volume energy density of the battery.

[0068] In some possible embodiments of the present disclosure, referring to FIG. 4 and FIG. 5, FIG. 4 shows a schematic view of a partial cross section of the installation gap in part B of FIG. 2, and FIG. 5 shows a schematic view of the pole post in the top cover assembly. The pole post 2 further comprises an extension 23 extending from one side of the abutting portion 22 in the radial direction R of the connecting portion 21, and the installation gap G is formed between the extension 23 and the side of the top cover assembly 1 facing the inside of the battery, and one end of the adapter 3 is located in the installation gap G.

[0069] In the embodiments of the present disclosure, the extension 23 can be arranged on the pole post 2 to increase the connection area between the adapter 3 and the pole post 2 through the extension 23.

[0070] For example, as shown in FIG. 4, the extension 23 can be arranged on the pole post 2 from the side close to the center of the top cover assembly 1; that is, the extension 23 can be arranged on the pole post 2 from the side of the abutting portion 22 in the radial direction R of the connecting portion 21 of the pole post 2. And through the arrangement of the structure and position of the extension 23, the installation gap G can be formed between the extension 23 and the top cover assembly 1 when the pole post 2 is installed on the top cover assembly 1, that is, the extension 23 has a certain distance from the top cover assembly 1. For example, the extension 23 can be arranged in a sheet structure, and one side of the sheet-shaped extension 23 is connected to one side of the abutting portion 22. The installation gap G can also be formed between the extension 23 and the top cover assembly 1 by reducing the thickness of the extension 23 and the like.

[0071] For another example, as shown in FIG. 3, one end of the adapter 3 can be arranged in the installation gap G formed between the extension 23 and the top cover assembly 1. In this way, through the arrangement of the thickness of the adapter 3 and the height of the installation gap G, the extension 23 can press the adapter 3 against the top cover assembly 1. For example, the adapter 3 can be welded and fixed to the extension 23 by welding.

[0072] In the above embodiments, since the extension 23 extending from one side of the abutting portion 22 is arranged on the pole post 2, and the installation gap G is formed between the extension 23 and the top cover assembly 1, one end of the adapter 3 can be located in the installation gap G to abut against the top cover assembly 1; and the connection area between the adapter 3 and the pole post 2 can be increased through the extension 23, which is conducive to improving the reliability of the electrical connection between the adapter 3 and the pole post 2.

[0073] In some possible embodiments of the present disclosure, in the axial direction A of the connecting portion 21, the abutting surface 221 on the abutting portion 22 is located closer to the top cover assembly 1 than the extension surface 231 on the extension 23; the abutting surface 221 is the surface on the abutting portion 22 close to the connecting portion 21, and the extension surface 231 is the surface on the extension 23 close to the connecting portion 21.

[0074] In the embodiments of the present disclosure, as shown in FIG. 5, the extension part 23 and the abutting part 22 can be arranged in the form of a step. That is, in the axial direction of the connecting part 21 and from the connecting part 21 to the abutting part 22, the extension part 23 can be arranged in the form of being lower than the abutting part 22.

[0075] For example, in the axial direction A of the connecting part 21, the surface of the abutting part 22 close to the connecting part 21 is arranged as the abutting surface 221, and the surface of the extension part 23 close to the connecting part 21 is arranged as the extension surface 231. As shown in FIG. 4 and FIG. 5, in the axial direction A of the connecting part 21, the extension surface 231 and the abutting surface 221 can be arranged such that the abutting surface 221 is closer to the top cover assembly 1 than the extension surface 231. In this way, when the abutting surface 221 abuts against the top cover assembly 1, the installation gap G can be formed between the extension surface 231 and the top cover assembly 1.

[0076] In the above embodiments, because the abutting surface 221 on the abutting part 22 is arranged to be closer to the top cover assembly 1 than the extension surface 231 on the extension part 23, after the pole post 2 is installed on the top cover assembly 1 through the installation through hole, a certain distance can be formed between the extension part 23 and the top cover assembly 1, so that the required installation gap G can be formed between the extension part 23 and the top cover assembly 1.

[0077] In some possible embodiments of the present disclosure, in the axial direction A of the connecting part 21, the thickness of the extension part 23 is smaller than the thickness of the abutting part 22, and the surface of the abutting part 22 away from the connecting part 21 and the surface of the extension part 23 away from the connecting part 21 are arranged in the same plane.

[0078] In the embodiments of the present disclosure, as shown in FIG. 5, the installation gap G can be formed between the extension part 23 and the top cover assembly 1 by reducing the thickness of the extension part 23.

[0079] For example, in the axial direction A of the connecting part 21, the bottom surface of the pole post 2 can be arranged as a smooth plane, that is, the surface of the abutting part 22 away from the connecting part 21 and the surface of the extension part 23 away from the connecting part 21 can be arranged in the same plane. In this way, the step can be formed between the extension part 23 and the abutting part 22 by reducing the thickness of the extension part 23. For example, the thickness of the extension part 23 can be determined according to the thickness of the adapter 3, that is, the thickness of the extension part 23 is determined to be smaller than the thickness of the abutting part 22, for example, the thickness of the extension part 23 is arranged to be half of the thickness of the abutting part 22. The embodiments of the present disclosure do not limit the specific thickness of the extension part 23 and the abutting part 22.

[0080] In the above embodiment, since the surface of the abutting portion 22 away from the connecting portion 21 and the surface of the extending portion 23 away from the connecting portion 21 are in the same plane, and the extending portion 23 is thinner than the abutting portion 22, not only can the mounting gap G be formed between the extending portion 23 and the top cover assembly 1, but also the surface of the pole 2 away from the top cover assembly 1 is facilitated to be processed.

[0081] In some possible embodiments of the present disclosure, referring to FIG. 6, FIG. 6 shows an exploded schematic view of the top cover assembly provided by the present disclosure. The top cover assembly 1 includes the top cover sheet 11, and the mounting through hole includes a first through hole 111 arranged on the top cover sheet 11.

[0082] In the embodiments of the present disclosure, the top cover sheet 11 can be arranged in the top cover assembly 1, and the shape and size of the top cover sheet 11 can be arranged according to the shape and size of the opening on the shell 5 in the battery. For example, the top cover sheet 11 can be arranged as a long strip-shaped sheet structure.

[0083] For example, two first through holes 111 can be arranged on the top cover sheet 11, and then two poles 2 in the battery can be assembled and installed with the top cover sheet 11 through the two first through holes 111, respectively.

[0084] In the above embodiment, since the top cover sheet 11 is arranged in the top cover assembly 1, the top cover sheet 11 can be fixedly connected with the opening on the shell 5 in the battery, so as to form a sealed space in the battery for chemical reaction to occur. At the same time, the first through hole 111 is arranged on the top cover sheet 11, so as to facilitate the connecting portion 21 of the pole 2 to pass out of the first through hole 111, so that the pole 2 extends to the outside of the battery.

[0085] In some possible embodiments of the present disclosure, the top cover assembly 1 further includes a first insulating member 12 matched with the top cover sheet 11, the first insulating member 12 is arranged on the side of the extending portion 23 of the top cover sheet 11 close to the pole 2, and the mounting through hole includes a second through hole 121 arranged on the first insulating member 12. The first insulating member 12 is arranged between the pole 2 and the top cover sheet 11 through the second through hole 121, so as to insulate the current between the pole 2 and the top cover sheet 11.

[0086] In the embodiments of the present disclosure, as shown in FIG. 4 and FIG. 6, the first insulating member 12 can be arranged in the top cover assembly 1, so as to insulate the current between the top cover sheet 11 and other parts and the pole 2 and other parts such as the battery cell 4 in the battery through the first insulating member 12.

[0087] Exemplarily, the first insulating member 12 can be arranged on the side of the top cover sheet 11 facing the inside of the battery along the axial direction A of the connecting portion 21 of the pole column 2, so as to insulate the top cover sheet 11 and the pole column 2 and the current between the top cover sheet 11 and the battery cell 4. For example, the structure of the first insulating member 12 can be arranged according to the structure of the top cover sheet 11. In the case where the top cover sheet 11 is a long strip-shaped structure, the first insulating member 12 can also be arranged as a long strip-shaped structure with an overall shape similar to the top cover sheet 11. The size of the first insulating member 12 is matched with the size of the top cover sheet 11, for example, the profile of the first insulating member 12 is smaller than the profile of the top cover sheet 11. In this way, in the case where the top cover sheet 11 is fixedly connected with the shell 5, the first insulating member 12 can be accommodated in the accommodating cavity of the shell 5.

[0088] Another example, the second through hole 121 can be arranged on the first insulating member 12 at a position corresponding to the pole column 2, and the second through hole 121 can be arranged to have a diameter larger than the diameter of the connecting portion 21 of the pole column 2, so that the connecting portion 21 can pass through the second through hole 121. The first insulating member 12 can be made of a plastic material with good insulation, for example, the first insulating member 12 can be made of polyolefin, polyurethane, polypropylene and the like.

[0089] In the above embodiment, since the first insulating member 12 adapted to the top cover sheet 11 is arranged in the top cover assembly 1, the first insulating member 12 can be arranged on the side of the top cover sheet 11 facing the inside of the battery, so as to insulate the current between the top cover sheet 11 and the pole column 2 and the current between the top cover sheet 11 and the battery cell 4.

[0090] In some possible embodiments of the present disclosure, referring to FIG. 7, FIG. 7 shows a schematic view of the first insulating member 12 in the top cover assembly provided by the present disclosure. The first insulating member 12 is provided with a pressing portion 122 on the side close to the extension portion 23, and the pressing portion 122 is used to apply a force to the adapter 3 towards the extension portion 23.

[0091] In the embodiment of the present disclosure, the pressing portion 122 can be arranged on the first insulating member 12, so as to apply a force to the adapter 3 through the pressing portion 122, or to increase the force applied by the first insulating member 12 to the adapter 3 through the pressing portion 122, so as to press and fix the adapter 3 between the first insulating member 12 and the extension portion 23 of the pole column 2.

[0092] As shown in FIG. 7, for example, a protrusion as the pressing portion 122 can be arranged on the side surface of the first insulating member 12 facing the inside of the battery, and the protrusion can be arranged on the first insulating member 12 close to the second through hole 121. The protrusion can be made of a material with elasticity, for example, so that the protrusion is deformed after abutting against the adapter 3, and thus an acting force towards the extending portion 23 of the pole 2 is applied to the adapter 3.

[0093] In the above embodiment, since the pressing portion 122 is arranged on the first insulating member 12, during the assembly of the adapter 3 and the pole 2, the pressing portion 122 can apply an acting force towards the extending portion 23 of the pole 2 to the adapter 3, so as to fix the adapter 3 and the pole 2, and thus the adapter 3 can be positioned relative to the pole 2, which is beneficial for the welding of the adapter 3 and the pole 2.

[0094] In some possible embodiments of the present disclosure, the top cover assembly 1 further comprises a fixing member 13, the fixing member 13 is provided with a first connecting structure 131, and the connecting portion 21 is provided with a second connecting structure 211 matched with the first connecting structure 131 at an end away from the extending portion 23; the fixing member 13 is located at a side of the top cover sheet 11 away from the extending portion 23, and the first connecting structure 131 is connected with the second connecting structure 211, so as to fix and connect the pole 2 and the top cover assembly 1.

[0095] In the embodiments of the present disclosure, as shown in FIG. 4 and FIG. 6, the fixing member 13 can be arranged in the top cover assembly 1, so as to fix and connect the pole 2 and the top cover assembly 1 through the fixing member 13.

[0096] For example, the fixing member 13 can be arranged at a position originally as the center of the battery of the top cover sheet 11, that is, the fixing member 13 is arranged at a side of the top cover sheet 11 away from the first insulating member 12. Meanwhile, matched connecting structures are arranged on the fixing member 13 and the connecting portion 21 of the pole 2 respectively, so as to fix and connect the fixing member 13 and the connecting portion 21, and thus the top cover sheet 11 and the first insulating member 12 are clamped and fixed between the pole 2 and the fixing member 13.

[0097] For example, as shown in FIG. 5, a card slot can be provided on the connecting portion 21 as the second connecting structure 211 away from the abutting portion 22, such as a ring-shaped recess. Correspondingly, as shown in FIG. 6, a ring-shaped protrusion can be provided on the fixing member 13 as the first connecting structure 131 matching the card slot, that is, a through hole is provided on the fixing member 13 matching the connecting portion 21, and the ring-shaped protrusion is provided on the inner wall of the through hole. For another example, the first connecting structure 131 and the second connecting structure 211 can be provided as matching threaded structures, that is, an external thread is provided on the connecting portion 21, and a threaded hole is provided on the fixing member 13; or a threaded hole is provided on the connecting portion 21, and a stud matching the threaded hole is provided on the fixing member 13. The present disclosure is not limited to the first connecting structure 131 and the second connecting structure 211.

[0098] In the above embodiment, since the fixing member 13 is provided in the top cover assembly 1, and the matching first connecting structure 131 and the second connecting structure 211 are respectively provided on the fixing member 13 and the connecting portion 21 of the pole 2, the fixing member 13 can be fixedly connected with the connecting portion 21 away from the abutting portion 22 through the first connecting structure 131 and the second connecting structure 211, so as to fixedly connect the pole 2 with the top cover assembly 1.

[0099] In some possible embodiments of the present disclosure, the top cover assembly 1 further comprises a second insulating member 14, and the mounting through hole comprises a third through hole 141 provided on the second insulating member 14, and the second insulating member 14 is arranged between the fixing member 13 and the top cover sheet 11 through the third through hole 141, so as to insulate the current between the fixing member 13 and the top cover sheet 11.

[0100] In the embodiment of the present disclosure, in the case that the fixing member 13 has a conductive property, the second insulating member 14 can be provided in the top cover assembly 1 to insulate the current between the fixing member 13 and the top cover sheet 11 through the second insulating member 14.

[0101] For example, in the case that the fixing member 13 is approximately a square plate structure, the second insulating member 14 can be provided as a square sheet structure matching the fixing member 13, and a recess can be further provided on the second insulating member 14, and the shape of the recess matches the shape of the fixing member 13. Then, at least a part of the fixing member 13 can be accommodated in the recess on the second insulating member 14, and the second insulating member 14 is located between the fixing member 13 and the top cover sheet 11.

[0102] Another example, a third through hole 141 can be provided on the second insulating member 14 to match the connecting portion 21 of the pole 2, so that the connecting portion 21 extends from the one side of the top cover sheet 11 to the other side of the top cover sheet 11 through the third through hole 141. The second insulating member 14 can be made of a plastic material with good insulation, for example, the second insulating member 14 can be made of polyolefin, polyurethane, polypropylene and the like.

[0103] In the above embodiment, since the second insulating member 14 is provided between the fixing member 13 and the top cover sheet 11, the current between the fixing member 13 and the top cover sheet 11 can be isolated by the second insulating member 14. At the same time, the third through hole 141 is provided on the second insulating member 14, so that the connecting portion 21 of the pole 2 extends to the side of the top cover sheet 11 away from the abutting portion 22 through the third through hole 141.

[0104] In some possible embodiments of the present disclosure, the top cover assembly 1 further comprises a sealing member 15, and the installation through hole comprises a fourth through hole 151 provided on the sealing member 15, and the sealing member 15 is arranged between the connecting portion 21 and the first through hole 111 through the fourth through hole 151.

[0105] In the embodiment of the present disclosure, as shown in FIG. 6, the sealing member 15 can be provided in the top cover assembly 1 to seal the gap between the pole 2 and the top cover assembly 1 by the sealing member 15.

[0106] For example, the sealing member 15 can be provided in the form of a ring structure, the diameter of the fourth through hole 151 on the ring-shaped sealing member 15 can be set to be smaller than the diameter of the connecting portion 21 of the pole 2, and the outer diameter of the ring-shaped sealing member 15 can be set to be greater than the diameter of the through hole on the first insulating member 12 and the top cover sheet 11. In addition, a convex ring can be provided on the ring-shaped sealing member 15, which can extend into the third through hole 141 and the first through hole 111 on the first insulating member 12 and the top cover sheet 11.

[0107] Another example, the sealing member 15 can be made of butyl rubber, fluororubber and the like, which has the characteristics of high strength, oil resistance, oxidation resistance, acid and alkali resistance and the like.

[0108] In the above embodiment, since the sealing member 15 is provided between the top cover sheet 11 and the pole 2, and the fourth through hole 151 is provided on the sealing member 15, the sealing member 15 can be sleeved on the connecting portion 21 of the pole 2, so that the sealing member 15 can be compressed by the top cover sheet 11 and the pole 2, thereby the gap between the first through hole 111 on the top cover sheet 11 and the pole 2 can be sealed by the sealing member 15.

[0109] In addition, the battery cell provided by the battery cell top cover assembly provided by any one of the embodiments described above, and the battery cell includes the cell 4, the shell 5, and the top cover assembly provided by any one of the embodiments described above; the cell 4 has the tab 41; the shell 5 has the accommodating cavity matched with the cell 4, and the cell 4 is installed in the accommodating cavity; the top cover assembly is connected with the opening of the accommodating cavity, and the other end of the adapter 3 is electrically connected with the tab 41.

[0110] In the embodiments of the present disclosure, the battery cell can be a secondary battery, which refers to a battery cell that can be activated by charging after discharging. The battery cell can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead-acid battery, etc., and the embodiments of the present disclosure are not limited thereto.

[0111] For example, the battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charging and discharging of the battery cell, active ions (such as lithium ions) are inserted and extracted between the positive electrode and the negative electrode. The separator is arranged between the positive electrode and the negative electrode, which can prevent the positive and negative electrodes from short-circuiting, and at the same time, the active ions can pass through.

[0112] In some embodiments, the electrode assembly is provided with a tab 41, which can guide the current out of the electrode assembly. The tab 41 includes a positive tab and a negative tab.

[0113] In some embodiments, the battery cell can include a shell 5. The shell 5 is used to encapsulate the electrode assembly and other components such as electrolyte. The shell 5 can be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell), or an aluminum-plastic film, etc. The shape of the shell 5 can be set according to the shape of the cell 4. The shell 5 forms an accommodating cavity, and at least one opening can be provided on the shell 5. The size and shape of the accommodating cavity on the shell 5 match the size and shape of the cell 4, and the cell 4 can be accommodated in the accommodating cavity, and the tab 41 of the cell 4 is located at the position of the opening on the shell 5.

[0114] For example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a soft package battery cell, or other shapes of battery cells. The prismatic battery cell includes a square battery cell, a blade-shaped battery cell, and a multi-prismatic battery cell, such as a hexagonal battery cell, etc., and the present disclosure is not particularly limited.

[0115] In the embodiments of the present disclosure, the top cover assembly provided by the above embodiments can be arranged at the opening on the shell 5, that is, the end of the adapter away from the pole 2 is electrically connected with the tab 41 of the cell 4, and the top cover sheet 11 is sealingly connected with the opening of the shell 5 to form the battery cell.

[0116] The battery cell provided by the embodiment of the present disclosure can reduce the space occupied by the adapter 3 due to the top cover assembly, and thus the space occupied by the top cover assembly in the battery cell can be reduced, which is beneficial to improve the volumetric energy density of the battery cell.

[0117] The embodiment of the present disclosure also provides a battery pack 100. Referring to FIG. 8, FIG. 8 shows a perspective exploded view of the battery pack provided by the present disclosure. The battery pack 100 comprises a box 6 and the battery cell provided by the above-mentioned embodiment; wherein the box 6 has a mounting cavity; and the battery cell is arranged in the mounting cavity.

[0118] In the embodiment of the present disclosure, one battery cell can be arranged in the box 6, or at least two battery cells can be arranged in the box 6. In the case of arranging at least two battery cells in the box 6, the at least two battery cells can be arranged and fixed to form a battery module 8. The at least two battery cells can be connected in series, in parallel or in a mixed manner. The mixed manner means that the at least two battery cells are connected in series and in parallel. Of course, the battery module 8 can also be in the form of a battery module 8 composed of at least two battery cells connected in series, in parallel or in a mixed manner, and a plurality of battery modules 8 are connected in series, in parallel or in a mixed manner to form a whole. One battery cell or battery module 8 can be installed in the accommodating cavity on the box 6.

[0119] In the embodiment of the present disclosure, the structure and shape of the mounting cavity in the box 6 can be determined according to the structure and shape of each battery module 8. The shape of the mounting cavity in the box 6 can be set to match the shape of the battery module 8, so that the battery module 8 can be fixedly installed in the mounting cavity to form the battery pack 100.

[0120] In the embodiment of the present disclosure, the battery pack 100 can also comprise a cover 7 which matches the box 6, that is, the shape of the cover 7 is consistent with the shape of the opening of the mounting cavity of the box 6. The cover 7 can be covered on the opening of the box 6 to form a closed battery pack 100 enclosed by the box 6 and the cover 7, and the battery cell or battery module 8 is arranged in the battery pack 100.

[0121] The battery pack 100 provided by the embodiment of the present disclosure can reduce the space occupied by the adapter 3 in the top cover assembly of the battery cell, and thus the space occupied by the top cover assembly in the battery cell can be reduced, which is beneficial to improve the volumetric energy density of the battery cell, and thus the volumetric energy density of the battery pack 100 can be improved.

[0122] The embodiment of the present disclosure also provides a power utilization device. Referring to FIG. 9, FIG. 9 shows a structural schematic view of the power utilization device provided by the present disclosure. The power utilization device comprises the battery cell or battery pack 100 provided by the above-mentioned embodiment for providing electric energy.

[0123] In the embodiments of the present disclosure, the battery cell and / or the battery pack 100 are installed in or electrically connected with the electric device, and the electric device can be provided with electric energy by the battery cell and / or the battery pack 100.

[0124] In the embodiments of the present disclosure, the electric device can be a mobile phone, a portable device, a notebook computer, an electric vehicle, an electric toy, an electric tool, a vehicle, a ship, a spacecraft and an energy storage power system, etc. Among them, the electric toy can include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy and an electric aircraft toy, etc., and the spacecraft can include an airplane, a rocket, a space shuttle and a spacecraft, etc.

[0125] In the following embodiments, for the convenience of description, the electric device of an embodiment of the present disclosure is taken as a vehicle for example. The following is described in conjunction with the drawings.

[0126] As shown in the figure, the vehicle can be a fuel car, a gas car or a new energy car, and the new energy car can be a pure electric car, a hybrid car or a range extended car, etc. The vehicle is internally provided with the battery pack 100, which can be arranged at the bottom, head or tail of the vehicle. The battery pack 100 can be used to power the vehicle, for example, the battery pack 100 can be used as the operating power source of the vehicle. The vehicle can also include a controller 200 and a motor 300, and the controller 200 is used to control the battery pack 100 to supply power to the motor 300, for example, to meet the working power demand of the vehicle during starting, navigation and driving.

[0127] In the embodiments of the present disclosure, the battery pack 100 can not only be used as the operating power source of the vehicle, but also be used as the driving power source of the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0128] The electric device provided by the embodiments of the present disclosure can reduce the space occupied by the adapter 3 in the top cover assembly of the battery cell, thereby reducing the space occupied by the top cover assembly in the battery cell, and further improving the volumetric energy density of the battery cell, so as to improve the volumetric energy density of the battery pack 100, which can prolong the power supply time of the battery cell or the battery pack 100 to the electric device.

[0129] The above embodiments are only used to illustrate the technical solutions of the present disclosure, rather than limit them; although the present disclosure has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that the technical solutions recorded in the above embodiments can still be modified, or some or all of the technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present disclosure, and they should be covered in the scope of the specification of the present disclosure. In particular, as long as there is no structural conflict, each technical feature mentioned in each embodiment can be combined in any manner.

Claims

1. A top cover assembly, comprising: A top cover assembly, wherein the top cover assembly is provided with a mounting through hole; A terminal, the terminal comprising a connecting portion and an abutting portion, the connecting portion being adapted to fit within the mounting through-hole and being passed through the mounting through-hole, the abutting portion extending from one end of the connecting portion along a radial direction of the connecting portion, and abutting against a side of the top cover assembly facing the interior of the battery; The adapter is located on one side of the pole in the radial direction of the connecting portion, one end of the adapter is electrically connected to one side of the abutting portion, and the other end of the adapter is used to electrically connect to the tab of the battery cell.

2. The top cover assembly according to claim 1, wherein: The pole also includes an extension portion, which extends from one side of the abutment portion in a radial direction along the connecting portion, and forms an installation gap between the extension portion and the side of the top cover assembly facing the interior of the battery, and one end of the adapter is located in the installation gap.

3. The top cover assembly according to claim 2, wherein: In the axial direction along the connecting portion, the abutting surface on the abutting portion is located closer to the top cover assembly than the extending surface on the extending portion; the abutting surface is a surface on the abutting portion close to the connecting portion, and the extending surface is a surface on the extending portion close to the connecting portion.

4. The top cover assembly according to claim 2 or 3, wherein: In the axial direction of the connecting portion, the thickness of the extending portion is smaller than the thickness of the abutting portion, and a surface of the abutting portion away from the connecting portion and a surface of the extending portion away from the connecting portion are located in the same plane.

5. The top cover assembly according to any one of claims 2 to 4, wherein: The top cover assembly includes a top cover piece, and the mounting through hole includes a first through hole provided on the top cover piece.

6. The top cover assembly according to claim 5, wherein: The top cover assembly also includes a first insulating member adapted to the top cover sheet, the first insulating member is arranged on a side of the top cover sheet close to the extension portion, the mounting through hole includes a second through hole arranged on the first insulating member, and the first insulating member is arranged between the pole and the top cover sheet through the second through hole to isolate the current between the pole and the top cover sheet.

7. The top cover assembly according to claim 6, wherein: A pressing portion is provided on one side of the first insulating member close to the extending portion, and the pressing portion is used to apply a force toward the extending portion to the adapter.

8. The top cover assembly according to any one of claims 5 to 7, wherein: The top cover assembly also includes a fixing member, which is provided with a first connecting structure, and a second connecting structure matching the first connecting structure is provided on an end of the connecting portion away from the extending portion; the fixing member is located on a side of the top cover sheet away from the extending portion, and the first connecting structure is connected to the second connecting structure to fix the pole to the top cover assembly.

9. The top cover assembly according to claim 8, wherein: The top cover assembly also includes a second insulating member, the mounting through hole includes a third through hole arranged on the second insulating member, and the second insulating member is arranged between the fixing member and the top cover piece through the third through hole to isolate the current between the fixing member and the top cover piece.

10. The top cover assembly according to any one of claims 5 to 9, wherein: The top cover assembly further includes a sealing member, the mounting through hole includes a fourth through hole provided on the sealing member, and the sealing member is provided between the connecting portion and the first through hole through the fourth through hole.

11. A battery cell comprising: A battery cell, wherein the battery cell has a tab; A housing having a housing adapted for the battery cell, wherein the battery cell is installed in the housing; The top cover assembly according to any one of claims 1 to 10, wherein the top cover assembly is connected to the opening of the accommodating cavity, and the other end of the adapter is electrically connected to the tab.

12. A battery pack comprising: A box body having a mounting cavity; At least one battery cell according to claim 11 is disposed in the mounting cavity. 13 . An electrical device comprising the battery cell according to claim 11 or the battery pack according to claim 12 for providing electrical energy.

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