Cover plate assembly and battery monomer

Abstract

The utility model discloses a cover plate assembly and a battery monomer, and relates to the technical field of batteries. The cover plate assembly is applied to the square-shell battery. The cover plate assembly comprises a cover plate, a pole and a bonding piece, the cover plate is provided with an accommodating hole, and the accommodating hole has an axial direction and a radial direction; the pole is arranged in the accommodating hole and comprises a body part and a connecting part, the body part is arranged on one side of the cover plate in a penetrating manner, and the connecting part is axially connected to one end of the body part and is positioned on one side of the cover plate; the bonding piece comprises a first bonding part and a second bonding part which are connected, the first bonding part is arranged between the cover plate and the connecting part in the axial direction, and the second bonding part is arranged between the body part and the cover plate in the axial direction. Therefore, according to the cover plate assembly, the bonding piece is adopted to replace a traditional insulating piece and a traditional sealing piece, so that the purposes of optimizing the structure of the cover plate assembly, reducing the number of parts of the cover plate assembly, simplifying the connecting process, improving the space utilization rate and improving the connecting reliability are achieved, and the cost is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery, in particular to a cover plate assembly and a battery cell. BACKGROUND

[0002] The current secondary battery includes a shell, an electrode assembly and a cover plate assembly. The shell provides a sealed space to accommodate the electrode assembly and electrolyte. The electrical energy of the battery is led out from the sealed space to the outside of the sealed space through the positive and negative electrode posts of the cover plate assembly. In the existing cover plate assembly, the cover plate is a metal plate with a through hole. The cover plate is provided with a liquid injection device and a safety valve device.

[0003] In the prior art, the cover plate assembly has many components, complex connection, low space utilization, complex process and certain safety hazards. CONTENT OF THE UTILITY MODEL

[0004] The utility model aims at providing a cover plate assembly and a battery cell to solve the technical problems of many components, complex connection process and low space utilization of the cover plate assembly.

[0005] In the first aspect, the utility model provides a cover plate assembly applied to a square cell. The cover plate assembly comprises a cover plate with a receiving hole having an axial direction and a radial direction; a post arranged in the receiving hole, the post comprising a body part and a connecting part, the body part being arranged on one side of the cover plate, the connecting part being connected to one end of the body part in the axial direction and located on one side of the cover plate; and an adhesive member comprising a first adhesive part and a second adhesive part connected to each other, the first adhesive part being arranged between the cover plate and the connecting part in the axial direction, and the second adhesive part being arranged between the cover plate and the body part in the radial direction.

[0006] In some embodiments, the cover plate assembly further comprises an insulating member arranged on the side of the cover plate away from the connecting part in the axial direction; wherein the insulating member is provided with a first mounting hole in the axial direction, and the body part is arranged in the first mounting hole.

[0007] In some embodiments, the cover plate assembly further comprises a fixing member arranged on the side of the insulating member away from the connecting part, the fixing member being provided with a second mounting hole in the axial direction, and the body part is further arranged in the second mounting hole.

[0008] In some embodiments, the second adhesive part is further arranged between the body part and the insulating member in the radial direction.

[0009] In some embodiments, the cover plate assembly has a reference plane perpendicular to the axial direction, and the outer diameter of the first adhesive part on the reference plane is greater than the outer diameter of the connecting part on the reference plane.

[0010] In some embodiments, the fixing member and the body part are connected in the radial direction by welding.

[0011] In a second aspect, the utility model also provides a battery monomer, include: shell, shell has opening, electrode assembly is arranged in the shell, and the above-mentioned cover plate subassembly, cover plate subassembly is connected with shell and is used for closing opening.

[0012] In some embodiments, the connecting portion is disposed away from the electrode assembly.

[0013] In some embodiments, the connecting portion is disposed close to the electrode assembly.

[0014] In some embodiments, the electrode assembly is provided with a tab, and the tab is connected with the body portion or the connecting portion.

[0015] The utility model discloses a technical effect lies in, using bonding member instead of traditional insulating piece and sealing piece, bonding member is set up between cover plate and pole, and the first bonding portion of bonding member is set up between the connecting portion of cover plate and pole in axial direction, and the second bonding portion of bonding member is set up between the body portion of cover plate and pole in radial direction, to reach the optimization cover plate subassembly structure, reduce the component quantity of cover plate subassembly, simplify the connecting process, improve the space utilization and improve the reliability of connection, to reach the purpose of reducing cost. BRIEF DESCRIPTION OF DRAWINGS

[0016] The technical scheme and other beneficial effects of the present application will become apparent from the following detailed description of specific embodiments of the present application, combined with the accompanying drawings.

[0017] Figure 1 The structure schematic diagram of the battery monomer provided for the embodiment of the present application.

[0018] Figure 2 The partial structure schematic diagram of the cover plate subassembly provided for the embodiment of the present application.

[0019] Figure 3 The Figure 1 The sectional view along the direction A-A.

[0020] Figure 4 The Figure 1 Another sectional view along the direction A-A.

[0021] Figure 5 The Figure 1 Another sectional view along the direction A-A.

[0022] The component identifiers of the drawings are as follows:

[0023] 1 shell, 10 opening,

[0024] 2 electrode assembly, 21 electrode body, 22 tab,

[0025] 3 cover plate assembly; 31 cover plate; 310 accommodating hole; 32 pole; 321 body portion; 322 connecting portion; 33 adhesive member; 331 first adhesive portion; 332 second adhesive portion; 34 insulating member; 340 first mounting hole; 35 fixing member; 350 second mounting hole; 36 weld. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0027] In the drawings, for the sake of clarity, the shapes and sizes can be exaggerated and the same reference signs will be used throughout the drawings to designate the same or like parts.

[0028] In the description of the present application, it should be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" 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 do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present application. In particular, "height" corresponds to the size from top to bottom, "width" corresponds to the size from left to right, and "depth" corresponds to the size from front to back, which are relative concepts, so it is possible that they will change accordingly according to different positions and different use states. Therefore, these or other orientations should not be used to interpret as limiting language.

[0029] The terms "first", "second", "third", etc. are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0030] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, it can be directly connected, or indirectly connected through an intermediate medium, it can be the communication between two elements inside. 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.

[0031] In the embodiments of the present application, the terms "plurality" and "a plurality of" refer to two or more. In the embodiments of the present application, unless otherwise specified, the description of "parallel" means approximately parallel within a certain error range, which can be a range of less than or equal to 5° deviation from absolute parallel. The description of "perpendicular" means approximately perpendicular within a certain error range, which can be a range of less than or equal to 5° deviation from absolute perpendicular.

[0032] The traditional cover plate assembly includes a cover plate, an explosion-proof valve, a pole, a lower insulating piece, a sealing piece, an upper edge piece, and a riveting block. In order to improve the structural strength of the cover plate assembly, the various components of the cover plate assembly are generally assembled together through injection molding or riveting process. The cover plate assembly has a large number of components, a complex structure, and a large number of assembly processes, and has a high cost.

[0033] To solve the technical problems of a large number of components, a complex connection process, and low space utilization of the cover plate assembly, the embodiments of the present application provide a cover plate assembly applied to a square cell (also referred to as a square cell core), the cover plate assembly comprising a cover plate, a pole, and an adhesive piece. The cover plate is provided with a receiving hole, and the receiving hole has an axial direction and a radial direction. The pole is arranged in the receiving hole, and the pole comprises a body part and a connecting part. The body part is arranged on one side of the cover plate, and the connecting part is connected to one end of the body part in the axial direction and located on one side of the cover plate. The adhesive piece comprises a first adhesive part and a second adhesive part connected to each other. The first adhesive part is arranged between the cover plate and the connecting part in the axial direction, and the second adhesive part is arranged between the body part and the cover plate in the axial direction. Therefore, the adhesive piece is used instead of the traditional insulating piece and sealing piece in the embodiments of the present application. The adhesive piece is arranged between the cover plate and the pole, and the first adhesive part of the adhesive piece is arranged between the cover plate and the connecting part of the pole in the axial direction, and the second adhesive part of the adhesive piece is arranged between the cover plate and the body part of the pole in the radial direction. The structure of the cover plate assembly is optimized, the number of components of the cover plate assembly is reduced, the connection process is simplified, the space utilization is improved, and the connection reliability is improved, so as to achieve the purpose of reducing the cost. The following will be described in detail.

[0034] As shown in FIG. 1, Figure 1 The embodiments of the present application provide a battery monomer, which has a first direction X, a second direction Y, and a third direction Z perpendicular to each other, and the first direction X is the thickness direction of the battery monomer, the second direction Y is the width direction of the battery monomer, and the third direction Z is the height direction of the battery monomer.

[0035] The battery cell can be a secondary battery, which refers to a single battery cell that can be activated by charging after discharging. For example, 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, or a nickel-cadmium battery, but is not limited thereto. The battery cell is used in an electric device such as a vehicle, a ship, or an aircraft to provide electric energy to each of the devices. The battery cell disclosed in the embodiments of the present application includes, but is not limited to, a battery cell used in an electric device such as a vehicle, a ship, or an aircraft. The electric device includes, but is not limited to, a mobile phone, a tablet, a notebook computer, an electric vehicle, an electric automobile, a ship, a spacecraft, and the like.

[0036] As shown in Figure 1 , the battery cell includes a housing 1, an electrode assembly 2, and a cover plate assembly 3. The housing 1 has an opening 10, the electrode assembly 2 is disposed in the housing 1, and the cover plate assembly 3 is connected to the housing 1 and used to close the opening 10.

[0037] Specifically, the housing 1 has an opening 10 on one side wall, and an accommodation space is formed in the opening 10 for accommodating the electrode assembly 2, and a cover plate 31 is provided at the opening 10. The shape and size of the cover plate 31 should be matched with the shape and size of the opening 10 on the housing 1 to close the opening 10 and protect the electrode assembly 2 installed in the housing 1. The cover plate 31 can be made of a material with a certain hardness to avoid deformation of the cover plate 31 when subjected to external force, and the external force is transmitted to the electrode assembly 2 through the cover plate 31, causing damage to the electrode assembly 2.

[0038] As shown in Figure 1 , the housing 1 has an opening 10 on one side wall, and a corresponding battery cell only needs one cover plate 31 to close the one opening 10. Of course, in other embodiments not shown in the drawings, the housing 1 can also have two openings 10 arranged opposite to each other, i.e., the housing 1 has two side walls arranged opposite to each other (i.e., the top wall and the bottom wall of the housing 1 shown in Figure 1 ), and each of the two side walls has an opening 10, so that two cover plates 31 are needed to close the two openings 10, respectively. Based on this, the two cover plates 31 are defined as being directed toward the accommodation space of the housing 1.

[0039] The housing 1 described above is made of aluminum, a metal material, to ensure that the battery has good heat dissipation effect. The housing 1 can also be made of copper, iron, aluminum alloy, or the like.

[0040] The electrode assembly 2 includes a positive electrode sheet, a negative electrode sheet, and a separator, the positive electrode sheet and the negative electrode sheet are alternately stacked, and the separator is arranged between the positive electrode sheet and the negative electrode sheet.

[0041] The battery monomer further comprises an electrolyte and other functional components, the electrolyte can be a conventional electrolyte, and can also be a special electrolyte added with an additive, and the electrolyte is used for soaking the electrode assembly 2. Among them, the electrode assembly 2 is a component in which an electrochemical reaction occurs in the battery monomer, and the electrode assembly 2 can be one or more. The positive plate and the negative plate have a part of active material constituting the electrode main body 21, and a part of the positive plate and the negative plate without active material constitutes the tab 22. In the charging and discharging process of the battery monomer, the active material reacts with the electrolyte, and the tab 22 is electrically connected with the pole 32 to form a current loop, so that the battery monomer is normally used.

[0042] As shown in Figures 2-3 The cover plate assembly 3 comprises a cover plate 31, a pole 32 and an adhesive 33.

[0043] The cover plate 31 is formed in a plate structure, and the cover plate 31 can be made of aluminum material, and the cover plate 31 can be formed in a rectangular or circular shape. The cover plate 31 is provided with a receiving hole 310, and the receiving hole 310 is a through hole structure penetrating through the cover plate 31. The receiving hole 310 has an axial direction and a radial direction, where the axial direction is specified as the third direction Z of the battery monomer, and the radial direction is any direction perpendicular to the third direction Z, including the first direction X and the second direction Y, Figure 3 The axial direction is the first direction X.

[0044] The pole 32 is arranged in the receiving hole 310. The pole 32 comprises a body part 321 and a connecting part 322, the body part 321 penetrates one side of the cover plate 31, and the connecting part 322 is connected to one end of the body part 321 in the axial direction and located at one side of the cover plate 31.

[0045] The body part 321 can be a circular or rectangular column structure, and the connecting part 322 can be a rectangular or circular plate structure. Among them, the pole 32 is in T-shaped structure along the first direction X, the size of the body part 321 in the radial direction is smaller than the size of the connecting part 322 in the radial direction, so that when the pole 32 is connected with other components, one end of the pole 32 can penetrate into the receiving hole 310, and the other end of the pole 32 can increase the connection area of one end of the pole 32 with other components.

[0046] The bonding member 33 includes a first bonding portion 331 and a second bonding portion 332. The first bonding portion 331 is arranged between the cover plate 31 and the connecting portion 322 in the axial direction. The second bonding portion 332 is arranged between the cover plate 31 and the body portion 321 in the radial direction. Thus, the first bonding portion 331 can realize insulation protection between the cover plate 31 and the connecting portion 322 of the pole column 32. The second bonding portion 332 can realize insulation protection between the cover plate 31 and the body portion 321 of the pole column 32. In addition, the two bonding portions of the bonding member 33 can ensure the assembly sealing of the pole column 32 and the cover plate 31, avoid liquid leakage of the battery monomer, and ensure the safety of the battery monomer.

[0047] Specifically, as shown in FIG. 1, in one embodiment, the first bonding portion 331 is attached between the upper surface of the cover plate 31 and the lower surface of the connecting portion 322, so as to bond and fix the cover plate 31 and the pole column 32, and realize insulation and sealing effects. Figure 4 As shown in FIG. 2, in another embodiment, the first bonding member 33 is attached between the lower surface of the cover plate 31 and the upper surface of the connecting portion 322, so as to bond and fix the cover plate 31 and the pole column 32, and realize insulation and sealing effects. Figure 5 As shown in FIG. 2, in another embodiment, the first bonding member 33 is attached between the lower surface of the cover plate 31 and the upper surface of the connecting portion 322, so as to bond and fix the cover plate 31 and the pole column 32, and realize insulation and sealing effects.

[0048] The cover plate assembly 3 has a reference plane perpendicular to the axial direction. The outer diameter of the first bonding member 33 on the reference plane is greater than the outer diameter of the connecting portion 322 on the reference plane. Thus, the first bonding member 33 can realize insulation protection between the cover plate 31 and the connecting portion 322 of the pole column 32 in the radial direction.

[0049] The bonding member 33 has strong bonding properties. The material of the bonding member 33 includes, but is not limited to, pressure-sensitive adhesive 、 Epoxy-based glue, polyurethane-based glue, acrylic-based glue, etc. These glues have good structural strength after complete curing and do not have elasticity.

[0050] The pole column 32 includes a positive pole column and a negative pole column. The bonding member 33 arranged between the positive pole column and the cover plate 31 is made of conductive material, such as carbon powder. Thus, the resistance value of the positive pole column is greater than that of the negative pole column. The battery monomer can realize electrical connection between the positive pole column and the cover plate 3. The resistance value between the positive pole column and the cover plate 3 can be kept stable.

[0051] In some embodiments, as shown in FIG. 3, the cover plate assembly 3 further includes an insulating member 34 arranged on the side of the cover plate 31 away from the connecting portion 322 in the axial direction. The insulating member 34 is provided with a first mounting hole 340 in communication with the accommodating hole 310 in the axial direction. The body portion 321 is arranged in the first mounting hole 340. The first mounting hole 340 is coaxially arranged with the accommodating hole 310. Figures 3-5

[0052] ​Figure 3 and Figure 4 In the embodiment, the insulating member 34 is arranged on the lower surface of the cover plate 31 in the axial direction, and in this embodiment, the insulating member 34 can serve as the lower plastic of the cover plate assembly 3. Figure 5 In the embodiment, the insulating member 34 is arranged on the upper surface of the cover plate 31 in the axial direction. In this embodiment, the insulating member 34 can serve as the upper plastic of the cover plate assembly 3.

[0053] As shown in Figures 3-5 , the second bonding portion 332 is also arranged between the body portion 321 and the insulating member 34 in the radial direction, that is, the second bonding portion 332 is arranged around the outer peripheral wall of the body portion 321, so as to avoid the existence of a gap between the insulating member 34 and the pole column 32 in the radial direction, thereby avoiding the shaking of the pole column 32, and thus enhancing the fixing effect of the pole column 32.

[0054] The insulating member 34 can be made of plastic material to play the role of insulation protection.

[0055] In some embodiments, as shown in Figures 4-5 , the cover plate assembly 3 further comprises a fixing member 35 arranged on the side of the insulating member 34 away from the connecting portion 322, and the fixing member 35 is provided with a second mounting hole 350 in communication with the accommodating hole 310 in the axial direction, and the body portion 321 is also arranged in the second mounting hole 350. Among them, the second mounting hole 350 is coaxially arranged with the accommodating hole 310.

[0056] The fixing member 35 and the body portion 321 can be riveted, so as to realize the positioning of the pole column 32 and the cover plate 31. The outer diameter of the insulating member 34 on the reference plane is greater than the outer diameter of the fixing member 35 on the reference plane, so as to play the role of insulation protection of the cover plate 31 and the fixing member 35 in the radial direction. The fixing member 35 can be formed as a block structure with a stepped hole.

[0057] The fixing member 35 and the body portion 321 are connected in the radial direction by welding. Among them, the welding seam 36 or welding scar left after the fixing member 35 and the body portion 321 are welded can increase the support and fixation of the pole column 32, and ensure the connection strength between the components.

[0058] The above-mentioned fixing member 35 can include but is not limited to an aluminum block, as long as it can support and fix the pole column 32.

[0059] The above-mentioned cover plate assembly 3 optimizes the structure of the cover plate assembly 3, reduces the number of components of the cover plate assembly 3, simplifies the connection process, improves the space utilization and improves the reliability of the connection, so as to achieve the purpose of reducing the cost.

[0060] As shown in Figure 1 , Figure 3 and Figure 4 , a first embodiment of the battery monomer is described.

[0061] In this embodiment, the electrode assembly 2 is provided with a tab 22. One end of the tab 22 is connected to the electrode body 21, and the other end of the tab 22 is connected to the end face of the body part 321 of the pole post 32. The connecting part 322 is located on the side away from the electrode assembly 2, thereby realizing the connection between the electrode assembly 2 and the pole post 32.

[0062] In this embodiment, the connecting portion 322 is located on the side away from the opening 10. That is, the connecting portion 322 of the pole post 32 is located above the cover plate 31. The cover plate 31 and the connecting portion 322 are connected axially through the first adhesive portion 331 of the adhesive member 33, thus achieving insulation and protection between the cover plate 31 and the connecting portion 322 of the pole post 32. At the same time, the outer diameter of the connecting portion 322 of the pole post 32 on the reference plane is larger than the outer diameter of the body portion 321 on the reference plane. This increases the contact area between the upper surface of the connecting portion 322 of the pole post 32 and other components, eliminating the need for an adapter piece when connecting the pole post 32 to other components.

[0063] Therefore, by providing an adhesive 33 between the cover plate 31 and the pole post 32, with the first adhesive portion 331 of the adhesive 33 being axially disposed between the upper surface of the cover plate 31 and the lower surface of the connection portion 322 of the pole post 32, and the second adhesive portion 332 of the adhesive 33 being radially disposed between the cover plate 31 and the body portion 321 of the pole post 32, the adhesive 33 replaces the traditional insulating component 34 and sealing component, thereby optimizing the structure of the cover plate assembly 3, reducing the number of components in the cover plate assembly 3, simplifying the connection process, improving space utilization, and improving the reliability of the connection, thus achieving the goal of reducing costs.

[0064] like Figure 1 and Figure 5 As shown, a second embodiment of the battery cell will be described. The difference between the second and first embodiments is that the connecting portion 322 is located on the side closer to the electrode assembly 2.

[0065] Specifically, the electrode assembly 2 includes an electrode body 21 and a tab 22. One end of the tab 22 is connected to the electrode body 21, and the other end of the tab 22 is connected to the lower surface of the connection portion 322 of the pole post 32, thereby realizing the connection between the electrode assembly 2 and the pole post 32.

[0066] In the embodiment, the connecting portion 322 is arranged on one side close to the opening 10, i.e. the connecting portion 322 of the pole 32 is arranged below the cover plate 31, and the cover plate 31 and the connecting portion 322 are connected in the axial direction by the first bonding portion 331 of the bonding member 33, so as to realize the insulation protection between the cover plate 31 and the connecting portion 322 of the pole 32. Meanwhile, the outer diameter of the connecting portion 322 of the pole 32 on the reference plane is greater than the outer diameter of the body portion 321 on the reference plane, so as to increase the contact area between the lower surface of the connecting portion 322 of the pole 32 and the tab 22, and the connecting sheet is not needed when the pole 32 is connected with the tab 22.

[0067] Therefore, by arranging the bonding member 33 between the cover plate 31 and the pole 32, and arranging the first bonding portion 331 of the bonding member 33 between the lower surface of the cover plate 31 and the upper surface of the connecting portion 322 of the pole 32 in the axial direction, and arranging the second bonding portion 332 of the bonding member 33 between the cover plate 31 and the body portion 321 of the pole 32 in the radial direction, the bonding member 33 replaces the conventional insulation member 34 and the sealing member, so as to optimize the structure of the cover plate assembly 3, reduce the number of components of the cover plate assembly 3, simplify the connection process (such as the injection molding and riveting process), improve the space utilization and the connection reliability, and thus reduce the cost.

[0068] In the above embodiments, the description of each embodiment has its own focus, and the part not described in detail in a certain embodiment can be referred to the related description of other embodiments.

[0069] The cover plate assembly and the battery cell provided by the embodiments of the present application are described in detail above, and the principle and implementation manner of the present application are described by applying specific examples; the above embodiment is only used to help understand the technical solution and the core idea of the present application; the person skilled in the art should understand that the technical solution recorded in the above embodiments can be modified, or some technical features can be replaced by the equivalent; and the modification or replacement does not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the present application.

Claims

1. A cover assembly, characterized by The application is applied to a square shell battery, and the cover plate assembly comprises: a cover plate, which is provided with a receiving hole having an axial direction and a radial direction; a pole column arranged in the receiving hole, the pole column comprising a body part and a connecting part, the body part being arranged on one side of the cover plate, and the connecting part being connected to one end of the body part along the axial direction and located on one side of the cover plate; an adhesive part comprising a first adhesive part and a second adhesive part, the first adhesive part being arranged between the cover plate and the connecting part along the axial direction, and the second adhesive part being arranged between the cover plate and the body part along the radial direction.

2. The cover assembly of claim 1, wherein, Further comprising: an insulating part arranged on one side of the cover plate away from the connecting part along the axial direction; wherein the insulating part is provided with a first mounting hole along the axial direction, and the body part is arranged in the first mounting hole.

3. The cover assembly of claim 2, wherein, Further comprising: a fixing part arranged on one side of the insulating part away from the connecting part, the fixing part being provided with a second mounting hole along the axial direction, and the body part being arranged in the second mounting hole.

4. The cover plate assembly according to claim 2, wherein the second adhesive part is further arranged between the body part and the insulating part along the radial direction.

5. The cover plate assembly according to claim 3, wherein the fixing part and the body part are connected by welding along the radial direction.

6. The cover plate assembly according to claim 1, wherein the cover plate assembly has a reference plane perpendicular to the axial direction, and an outer diameter of the first adhesive part on the reference plane is greater than an outer diameter of the connecting part on the reference plane.

7. A battery cell characterized by, comprising: a shell having an opening; an electrode assembly arranged in the shell; and the cover plate assembly according to any one of claims 1 to 6, which is connected to the shell and used for closing the opening.

8. The battery cell according to claim 7, wherein the connecting part is arranged on one side away from the electrode assembly.

9. The battery cell according to claim 7, wherein the connecting part is arranged on one side close to the electrode assembly.

10. The battery cell according to claim 7, wherein the electrode assembly is provided with a tab, and the tab is connected to the body part or the connecting part. ​

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