Battery monomer, battery device and electric equipment

Abstract

The invention discloses a battery monomer, a battery device and electric equipment. The battery cell includes a housing, an electrode assembly, a first electrode terminal, a bus member, a conductive member, and a first insulator. The housing includes a wall portion. The electrode assembly includes a main body portion and a first tab. The first electrode terminal is directly connected to the first tab, and at least part of the first electrode terminal is accommodated in the electrode lead-out hole of the wall part. The confluence component is arranged on one side, back to the main body part, of the wall part and is directly connected with the first electrode terminal. The conductive part is arranged on the wall part and surrounds the first electrode terminal, at least part of the conductive part is arranged between the confluence part and the wall part in the thickness direction of the wall part, and the conductive part is electrically connected to the confluence part and the first electrode terminal. The first insulator is at least partially disposed between the conductive member and the wall portion. An overcurrent path can be formed between the first tab and the convergence component through the first electrode terminal, so that the number of times of connection between the components can be reduced, the assembly process is simplified, and the assembly efficiency is improved.

Description

Technical Field

[0001] The present application belongs to the field of battery technology, and in particular relates to a battery cell, a battery device and an electrical equipment. Background Art

[0002] Batteries are widely used in electronic devices, such as mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric boats, electric toy cars, electric toy boats, electric toy airplanes and power tools, etc.

[0003] The development of battery technology must take into account many design factors at the same time, such as reliability, energy density, cycle life, processing technology, etc., and also the assembly and current capacity of the battery. Summary of the invention

[0004] The embodiments of the present application provide a battery cell, a battery device and an electrical equipment, which are helpful in simplifying the assembly process and improving the current carrying capacity.

[0005] According to a first aspect of the present application, the present application provides a battery cell, which includes a shell, an electrode assembly, a first electrode terminal, a busbar and a conductive component. The shell includes a wall portion, and the wall portion is provided with an electrode lead-out hole. The electrode assembly is accommodated in the shell, and includes a main body portion and a first pole ear led out from the main body portion. The first electrode terminal is directly connected to the first pole ear, and at least a portion of the first electrode terminal is accommodated in the electrode lead-out hole of the wall portion. The busbar is arranged on a side of the wall portion facing away from the main body portion, and the busbar is directly connected to the first electrode terminal. The conductive component is arranged on the wall portion and surrounds the first electrode terminal. In the thickness direction of the wall portion, at least a portion of the conductive component is arranged between the busbar and the wall portion, and the conductive component is electrically connected to the busbar and the first electrode terminal. The first insulating member is at least partially arranged between the conductive component and the wall portion.

[0006] In the embodiment of the present application, the busbar component is pre-connected to the first electrode terminal. After the battery cells are stacked, the busbar component can be received and positioned, which is conducive to simplifying the assembly process. In addition, in the embodiment of the present application, a conductive component is also arranged between the busbar component and the wall portion. The conductive component is electrically connected to the busbar component and the first electrode terminal. The conductive component can not only limit the deformation of the busbar component toward the wall portion, reduce the risk of short circuit caused by contact between the busbar component and the wall portion, but also form an additional current flow path between the busbar component and the first electrode terminal, increase the current flow area, and improve the current flow capacity of the battery cell. The first electrode terminal is directly connected to the busbar component and the first pole ear, which can reduce the number of connections between components, simplify the assembly process, and improve assembly efficiency.

[0007] In some embodiments, at least one of the first electrode terminal and the current collecting component is welded to the conductive component. Thus, the connection strength between the first electrode terminal and the conductive component and / or between the current collecting component and the conductive component can be enhanced, which is conducive to improving the stability of the conductive component. In addition, when the first electrode terminal and the current collecting component are both welded to the conductive component, an additional current flow path can be formed between the first electrode terminal, the conductive component and the current collecting component, which is conducive to reducing the risk of connection failure between the first electrode terminal and the current collecting component.

[0008] In some embodiments, the busbar component, the first electrode terminal and the conductive component are welded to form a first welding portion. The busbar component, the first electrode terminal and the conductive component are welded simultaneously, which is beneficial to reduce the number of welding times and improve welding efficiency.

[0009] In some embodiments, the conductive component is provided with a first through hole, the first through hole penetrates the conductive component along the thickness direction of the wall portion, and the outer peripheral surface of the first electrode terminal is welded to the hole wall of the first through hole and forms a part of the first welding portion. The first electrode terminal and the conductive component are welded to the seam, which is conducive to reducing welding power, reducing welding heat generation, and improving welding effect.

[0010] In some embodiments, the busbar component is disposed around the first electrode terminal and welded to the outer periphery of the first electrode terminal. The first electrode terminal and the busbar component are welded to the seam, which is conducive to reducing welding power, reducing welding heat generation, and improving welding effect.

[0011] In some embodiments, the busbar component is provided with a second through hole, and the second through hole penetrates the busbar component along the thickness direction of the wall portion; a portion of the first electrode terminal is accommodated in the second through hole and welded to the busbar component. The first electrode terminal and the busbar component are butt-welded, which is conducive to reducing welding power, reducing welding heat generation, and improving welding effect.

[0012] In some embodiments, along the thickness direction of the wall portion, the first electrode terminal has a first surface facing away from the main body portion, the current collector has a second surface facing away from the main body portion, and the first surface and the second surface are flush. Thus, not only is the welding operation convenient, but also the weld marks between the current collector and the first electrode terminal can be connected to the first surface and the second surface, which is beneficial to enhancing the welding strength between the current collector and the first electrode terminal, increasing the weld mark area between the two, and improving the current carrying capacity.

[0013] In some embodiments, the surface of the current collecting component facing the wall portion abuts against the first electrode terminal, thereby increasing the contact area between the current collecting component and the first electrode terminal, thereby increasing the flow area between the two, which is beneficial to improving the flow capacity.

[0014] In some embodiments, the conductive component is provided with a first through hole, and the first through hole penetrates the conductive component along the thickness direction of the wall portion; the current collecting component includes a current collecting body and a weak portion, the thickness of the weak portion is less than the thickness of the current collecting body, and along the thickness direction of the wall portion, the weak portion covers the hole wall of the first through hole, and the weak portion, the first electrode terminal and the conductive component are welded. During welding, the welding heat can penetrate the weak portion and heat the outer peripheral surface of the first electrode terminal and the hole wall of the first through hole, thereby welding the weak portion, the first electrode terminal and the conductive component. Since the thickness of the weak portion is relatively thin, the heat penetration efficiency can be improved, thereby reducing the welding power, reducing the welding heat generation, and improving the welding effect.

[0015] In some embodiments, the surface of the current collecting component facing the wall portion abuts against the conductive component, thereby not only improving the supporting stability of the conductive component on the current collecting component, but also facilitating the formation of a seal between the current collecting component and the conductive component, thereby improving the sealing performance of the battery cell.

[0016] In some embodiments, the first electrode terminal includes a first terminal portion and a second terminal portion, the first terminal portion is arranged on the side of the wall portion facing the main body and connected to the first pole ear, and the second terminal portion protrudes from the surface of the first terminal portion facing the wall portion; at least part of the second terminal portion is accommodated in the electrode lead-out hole, the conductive component is arranged around the second terminal portion, and the second terminal portion is welded to the current collecting component; in the thickness direction of the wall portion, a part of the wall portion is located between the first terminal portion and the current collecting component. The first terminal portion is arranged on the side of the wall portion facing the main body, which is conducive to shortening the length of the first pole ear being led out from the main body, facilitating the connection between the first terminal portion and the first pole ear; and it can also reduce the risk of the first electrode terminal coming out of the electrode lead-out hole. The second terminal portion protrudes from the first terminal portion, which can enhance the overall strength of the first electrode terminal and reduce the risk of its deformation during welding.

[0017] In some embodiments, the second terminal portion is a solid structure. The second terminal portion is not provided with a recess, a through hole or other structures, which can increase the flow area of ​​the second terminal portion and enhance the deformation resistance of the second terminal portion itself, which is beneficial to improving the flow capacity and overall strength of the first electrode terminal.

[0018] In some embodiments, the second terminal portion includes a first sub-portion and a second sub-portion connected to each other, the first sub-portion is connected to the first terminal portion and formed integrally with the first terminal portion, and along the thickness direction of the wall portion, at least part of the second sub-portion is located on the side of the first sub-portion that is away from the main body portion; the base metals of the first sub-portion and the second sub-portion are different, the base metals of the second sub-portion and the busbar are the same, and the second sub-portion is welded to the busbar. Thus, it is beneficial for the first electrode terminal to be respectively connected to the busbar and the first pole tab with different base metals by welding, thereby improving the connection strength and connection stability between the first electrode terminal and the busbar, and between the first electrode terminal and the first pole tab.

[0019] In some embodiments, the second sub-section is located on the side of the first sub-section facing away from the main body, and a portion of the first sub-section protrudes from the outer peripheral surface of the second sub-section and forms a step surface on the side facing the second sub-section; along the thickness direction of the wall, a portion of the first insulating member is located on the side of the step surface facing the second sub-section and is clamped between the conductive component and the step surface. Thus, the first insulating member can be used to achieve sealing between the conductive component and the first sub-section, reducing the possibility of the electrolyte penetrating through the gap between the conductive component and the first sub-section to the composite surface of the first sub-section and the second sub-section, which is conducive to reducing the risk of the first sub-section and the second sub-section being corroded by electrochemical reactions due to contact with the electrolyte. In addition, the insulation isolation between the wall and the conductive component, as well as the sealing between the first sub-section and the conductive component are achieved by the first insulating member, which can reduce the number of components, reduce assembly errors, and help improve assembly efficiency.

[0020] In some embodiments, the conductive component is disposed on the side of the wall facing away from the electrode assembly, and a portion of the first insulating component is clamped between the wall and the conductive component. Thus, the first insulating component can be used to achieve sealing between the wall and the conductive component, which is beneficial to improving the sealing performance of the battery cell.

[0021] In some embodiments, the conductive component is welded to at least one of the second sub-section and the current collecting component. Thus, the connection strength between the second sub-section and the conductive component and / or between the current collecting component and the conductive component can be enhanced, which is conducive to improving the stability of the conductive component. In addition, when the second sub-section and the current collecting component are both welded to the conductive component, an additional current flow path can be formed between the second sub-section, the conductive component and the current collecting component, which is conducive to reducing the risk of failure of the connection between the first electrode terminal and the current collecting component.

[0022] In some embodiments, the conductive component includes a first conductive portion and a second conductive portion connected to each other, and along the thickness direction of the wall portion, at least part of the second conductive portion is located on the side of the first conductive portion facing away from the main body; the first conductive portion surrounds the first sub-portion, the base metal of the first conductive portion is the same as the base metal of the first sub-portion, the second conductive portion is the same as the base metal of the second sub-portion, and the second conductive portion is welded to at least one of the second sub-portion and the confluence component. As a result, it is not easy to form an interface with different base metals between the first sub-portion and the first conductive portion, which is conducive to reducing the risk of the first sub-portion and the first conductive portion being corroded due to contact with the electrolyte. In addition, the base metal of the second conductive portion, which is at least partially located on the side of the first conductive portion facing away from the main body, is the same as the base metal of the second sub-portion, and the second conductive portion can be connected to the second sub-portion and / or the confluence component by welding, which is conducive to reducing the difficulty of welding and improving the welding effect.

[0023] In some embodiments, the base metal of the first sub-unit is copper, and the base metal of the second sub-unit is aluminum. In the embodiment of the present application, the base metal of the first sub-unit is copper, which is convenient for welding between the first sub-unit and the first pole lug. In the embodiment of the present application, the base metal of the second sub-unit is aluminum, which is convenient for welding between the second sub-unit and the current collecting component and is conducive to reducing costs.

[0024] In some embodiments, along the thickness direction of the wall portion, a portion of the first pole lug is located on the side of the first terminal portion facing the wall portion and is connected to the first terminal portion. A portion of the first pole lug (e.g., the bent section) and the first terminal portion can share at least part of the space in the thickness direction, which is beneficial to improving space utilization. In addition, the first pole lug only needs to be bent once, and there is no need to reserve a large bending space for the first pole lug between the first terminal portion and the main body, which is beneficial to improving the space utilization in the housing and improving the energy density of the battery cell.

[0025] In some embodiments, the conductive component is welded to at least one of the first electrode terminal and the current collecting component; the conductive component includes a conductive body, a first limiting portion and a second limiting portion, the first limiting portion is at least partially disposed on the side of the wall away from the electrode assembly, the second limiting portion is at least partially disposed on the side of the wall facing the electrode assembly, a portion of the conductive body is accommodated in the electrode lead-out hole and connected to the first limiting portion and the second limiting portion; along the thickness direction of the wall, a portion of the first pole ear is located between the second limiting portion and the first terminal portion, and connected to the second limiting portion. A flow path can be formed between the first pole ear and the conductive component, and part of the current can be directly transmitted between the first pole ear and the conductive component, which is beneficial to improving the flow capacity of the battery cell.

[0026] In some embodiments, the conductive component includes a conductive body, a first limiting portion and a second limiting portion, the first limiting portion is at least partially disposed on a side of the wall away from the electrode assembly, the second limiting portion is at least partially disposed on a side of the wall facing the electrode assembly, and a portion of the conductive body is accommodated in the electrode lead-out hole and connected to the first limiting portion and the second limiting portion. Thus, the conductive component can be limited in the thickness direction, reducing the risk of the conductive component falling into or outside the housing.

[0027] In some embodiments, the conductive component is disposed on a side of the wall away from the main body; the battery cell includes a fixing member, which is at least partially disposed on a side of the conductive component away from the wall and connected to the wall. The conductive component is disposed on a side of the wall away from the electrode assembly, which does not occupy the internal space of the housing, and can increase the size of the electrode assembly within a limited space, thereby increasing the capacity of the battery cell. In addition, the fixing member can apply a force toward the wall to the conductive component, which is conducive to pressing the conductive component against the wall, realizing the assembly of the conductive component and the wall, and can also improve the sealing performance of the battery cell.

[0028] In some embodiments, the electrode assembly further includes a second pole lug extending from the main body, the second pole lug having a polarity opposite to that of the first pole lug; the battery cell further includes a second electrode terminal and an adapter, the second electrode terminal is disposed on the wall, and includes a third terminal portion and a fourth terminal portion connected to each other, the third terminal portion and the fourth terminal portion have different base metals, the adapter is connected to the second pole lug and the third terminal portion, at least part of the fourth terminal portion is disposed on a side of the third terminal portion facing away from the main body, and the base metal of the fourth terminal portion is the same as the base metal of the busbar component. Thus, it is convenient to connect the third terminal portion and the fourth terminal portion to the adapter and the busbar component of another battery cell, respectively, which is conducive to reducing the difficulty of connection and improving the reliability of connection.

[0029] In some embodiments, the adapter is welded to the third terminal portion and forms a second welding portion, and the second welding portion is exposed on the side of the second electrode terminal away from the main body. During the welding operation, the third terminal portion and the adapter can be heated from the outside of the second electrode terminal, so that a portion of the second welding portion W is exposed on the outside of the second electrode terminal. In this way, the possibility of welding particles generated during the welding process falling into the side of the adapter facing the main body can be reduced, the risk of internal short circuit of the battery cell can be reduced, and the reliability of the battery cell can be improved.

[0030] In some embodiments, the base metal of the third terminal portion and the adapter is copper, and the base metal of the fourth terminal portion is aluminum. In the embodiment of the present application, the base metal of the adapter is set to copper, which is convenient for welding between the adapter and the second pole ear. The base metal of the third terminal portion and the adapter is set to copper, which is convenient for welding between the third terminal portion and the adapter. The base metal of the fourth terminal portion is set to aluminum, which is convenient for welding between the fourth terminal portion and the current collecting component of another battery cell.

[0031] In some embodiments, the housing includes a shell and an end cover, the shell has an opening, the end cover is connected to the shell and covers the opening, and the wall portion is the end cover. This is conducive to simplifying the assembly operation and reducing the difficulty of assembly.

[0032] According to the second aspect of the present application, an embodiment of the present application further provides a battery device, which includes a plurality of battery cells provided according to any embodiment of the first aspect of the present application.

[0033] In some embodiments, the electrode assembly includes a second pole ear extending from the main body, the second pole ear has opposite polarity to the first pole ear; the battery cell also includes a second electrode terminal electrically connected to the second pole ear; the busbar component of one battery cell is welded to the second electrode terminal of another battery cell.

[0034] According to the third aspect of the present application, an embodiment of the present application further provides an electrical device, which includes a battery device provided by any embodiment of the second aspect of the present application, and the battery device is used to provide electrical energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0036] Figure 1 It is a schematic diagram of the structure of a vehicle provided in some embodiments of the present application.

[0037] Figure 2 It is a schematic diagram of the exploded structure of a battery device provided in some embodiments of the present application.

[0038] Figure 3 It is a schematic diagram of the exploded structure of a battery cell provided in some embodiments of the present application.

[0039] Figure 4 yes Figure 3 A schematic cross-sectional view of a battery cell is shown.

[0040] Figure 5 yes Figure 4 Schematic diagram of the enlarged structure of area A in the middle.

[0041] Figure 6 yes Figure 5 Schematic diagram of the decomposition structure.

[0042] Figure 7 It is a partial structural cross-sectional view of a battery cell provided in some other embodiments of the present application.

[0043] Figure 8 It is a partial structural cross-sectional view of a battery cell provided in some other embodiments of the present application.

[0044] Fig. 9 It is a partial structural cross-sectional view of a battery cell provided in some other embodiments of the present application.

[0045] Fig.10 yes Fig. 9 Schematic diagram of the enlarged structure of area B in the middle.

[0046] Fig.11 is along Figure 4 Schematic cross-sectional view taken along direction CC.

[0047] Fig.12 yes Fig.11 Schematic diagram of the enlarged structure of area D in the middle.

[0048] Fig.13 It is a schematic diagram of the structure of the electrode assembly of the battery cell provided in some embodiments of the present application.

[0049] Fig.14 yes Fig.13 Schematic diagram of the enlarged structure of area E in the middle.

[0050] Fig.15 yes Figure 4 Schematic diagram of the enlarged structure of area F in the middle.

[0051] Fig.16 It is a partial structural schematic diagram of a battery device provided in some embodiments of the present application.

[0052] In the attached figure: Vehicle 1, battery device 2, controller 3, motor 4; Box body 5, first box body part 5a, second box body part 5b, accommodating space 5c; Battery cell 6, electrode assembly 10, main body 11, first pole ear 12, folded section 121, bent section 122, extended section 123, second pole ear 13, shell 20, shell 21, opening 211, end cover 22, wall 23, electrode lead-out hole 231, first electrode terminal 30, first surface 30a, first terminal portion 31, second terminal portion 32, first sub-portion 321, step surface 321a, second sub-portion 322, converging component 40, second surface 40a, second through hole 41, Weak portion 42, busbar body 43, conductive component 50, first conductive portion 51, second conductive portion 52, conductive body 53, first limiting portion 54, second limiting portion 55, first through hole 56, first insulating member 60, first part 61, second part 62, third part 63, fixing member 71, second insulating member 72, second electrode terminal 80, third terminal portion 81, fourth terminal portion 82, adapter 90, first welding portion W1, second welding portion W2, thickness direction X, width direction Y. DETAILED DESCRIPTION

[0053] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0054] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0055] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments.

[0056] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0057] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0058] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0059] The term “plurality” used in this application refers to two or more (including two).

[0060] In the embodiments of the present application, "parallel" includes not only the absolutely parallel situation, but also the roughly parallel situation conventionally recognized in engineering; at the same time, "vertical" includes not only the absolutely vertical situation, but also the roughly vertical situation conventionally recognized in engineering.

[0061] In the embodiment of the present application, the battery cell may be a secondary battery cell, which refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0062] The battery cells can be lithium-ion battery cells, sodium-ion battery cells, sodium-lithium-ion battery cells, lithium metal battery cells, sodium metal battery cells, lithium-sulfur battery cells, magnesium-ion battery cells, nickel-hydrogen battery cells, nickel-cadmium battery cells, lead-acid battery cells, etc., which are not limited in the embodiments of the present application.

[0063] A battery cell generally includes an electrode assembly, a housing, and an electrode terminal. The electrode assembly is contained in the housing, and the electrode terminal is disposed in the housing. The housing is used to encapsulate the electrode assembly and components such as the electrolyte. The electrode assembly includes a tab, which is electrically connected to the electrode terminal through an adapter or directly electrically connected to the electrode terminal. The electrode terminal can be used to electrically connect the electrode assembly to a circuit outside the battery cell to realize charging or discharging of the battery cell.

[0064] The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of the battery cell, active ions (such as lithium ions) are embedded and released back and forth between the positive electrode and the negative electrode. The separator is set between the positive electrode and the negative electrode to prevent the positive and negative electrodes from short-circuiting, while allowing active ions to pass through.

[0065] In some embodiments, the positive electrode may be a positive electrode sheet, and the positive electrode sheet may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0066] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0067] In some embodiments, a separator is disposed between the positive electrode and the negative electrode.

[0068] In some embodiments, the separator is a separator. The present application has no particular limitation on the type of separator, and any known separator with a porous structure having good chemical stability and mechanical stability can be selected.

[0069] In some embodiments, the separator is a solid electrolyte, which is disposed between the positive electrode and the negative electrode and serves to transmit ions and isolate the positive and negative electrodes.

[0070] In some embodiments, the electrode assembly is a wound structure, wherein the positive electrode sheet and the negative electrode sheet are wound into a wound structure.

[0071] In some embodiments, the electrode assembly is a laminate structure.

[0072] The battery device mentioned in the embodiments of the present application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include a plurality of battery cells, and the plurality of battery cells are connected in series, in parallel or in mixed connection through a busbar.

[0073] In some embodiments, a battery cell assembly is generally formed by arranging a plurality of battery cells.

[0074] A battery device generally includes a box for encapsulating one or more battery cells, which can prevent liquid or other foreign matter from affecting the charging or discharging of the battery cells.

[0075] As an example, the battery cell assembly may be a battery module, which is formed by arranging and fixing a plurality of battery cells to form an independent module. As an example, the battery module may be formed by bundling a plurality of battery cells by cable ties. The battery cell assembly may be accommodated in the box by fixing the battery module in the box. As an example, the box may include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected to the frame, so that a closed space is formed inside the box to accommodate the battery cell assembly.

[0076] In some embodiments, the box body can be used as a part of the chassis structure of the vehicle. For example, part of the box body can become at least a part of the floor of the vehicle, or part of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0077] In some embodiments, the battery device may be an energy storage device, which includes an energy storage container, an energy storage cabinet, and the like.

[0078] In the related art, the tabs are usually connected to the electrode terminals through adapters. After the battery cells are assembled, multiple battery cells are stacked first, and then multiple battery cells and multiple busbars are connected to achieve electrical connection between multiple battery cells. However, the tabs, adapters, electrode terminals, and busbars need to be connected multiple times in sequence, and during assembly, the battery cells and busbars are separately sourced, and the busbars need to be positioned when assembling, which complicates the assembly process.

[0079] In some embodiments of the present application, the busbar can be pre-connected to the electrode terminals of the battery cell, so that after the battery cells are stacked, the busbar can be received and positioned, thereby simplifying the assembly process. However, during the formation and transportation of the battery cells, the busbar is only connected to the electrode terminals of a single battery cell, so it is easy to contact the outer shell of the battery cell due to deformation and other reasons, causing a short circuit risk.

[0080] In view of this, the embodiment of the present application provides a technical solution, which connects the busbar component to the electrode terminal, and sets a conductive component between the busbar component and the shell wall of the shell, and the conductive component is electrically connected to the busbar component and the electrode terminal. The conductive component can not only limit the deformation of the busbar component toward the shell wall of the shell, reduce the risk of the busbar component contacting the shell, but also increase the flow area and improve the flow capacity. In addition, the electrode terminal is directly connected to the pole ear and the busbar component, which can reduce the number of connections between components, simplify the assembly process, and improve assembly efficiency.

[0081] The technical solution provided in the embodiments of the present application is applicable to battery cells, battery devices, and electrical equipment using the battery devices.

[0082] The battery device disclosed in the embodiments of the present application can be used in various energy storage systems that use the battery device as a power source or use the battery device as an energy storage element. The electrical device can be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, and the like. Among them, the electric toy can include a fixed or mobile electric toy, for example, a game console, an electric car toy, an electric ship toy, and an electric airplane toy, and the like, and the spacecraft can include an airplane, a rocket, a space shuttle, and a spacecraft, and the like.

[0083] For the convenience of description, the following embodiments are described by taking the electric device as a vehicle as an example.

[0084] Figure 1 is a schematic diagram of the structure of a vehicle provided by some embodiments of the present application. Figure 1 The vehicle 1 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery device 2 is provided inside the vehicle 1, and the battery device 2 may be provided at the bottom, head or tail of the vehicle 1. The battery device 2 may be used to power the vehicle 1, for example, the battery device 2 may be used as an operating power source for the vehicle 1. The vehicle 1 may also include a controller 3 and a motor 4, and the controller 3 is used to control the battery device 2 to power the motor 4, for example, for starting, navigating and driving the vehicle 1.

[0085] In some embodiments of the present application, the battery device 2 can not only serve as an operating power source for the vehicle 1 , but also serve as a driving power source for the vehicle 1 , replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1 .

[0086] Figure 2 is a schematic diagram of the exploded structure of a battery device provided in some embodiments of the present application. Figure 2The battery device 2 includes a box body 5 and a battery cell 6, and the battery cell 6 is accommodated in the box body 5. The box body 5 is used to provide a storage space for the battery cell 6, and the box body 5 can adopt a variety of structures. In some embodiments, the box body 5 may include a first box body part 5a and a second box body part 5b, the first box body part 5a and the second box body part 5b cover each other, and the first box body part 5a and the second box body part 5b jointly define a storage space 5c for accommodating the battery cell 6. The second box body part 5b may be a hollow structure with one end open, the first box body part 5a may be a plate-shaped structure, the first box body part 5a covers the open side of the second box body part 5b, so that the first box body part 5a and the second box body part 5b jointly define the storage space 5c; the first box body part 5a and the second box body part 5b may also be hollow structures with one side open, and the open side of the first box body part 5a covers the open side of the second box body part 5b. Of course, the box body 5 formed by the first box body part 5a and the second box body part 5b can be in various shapes, such as a cylinder, a cuboid, etc.

[0087] In order to improve the sealing performance after the first box body part 5a and the second box body part 5b are connected, a sealing member, such as a sealant, a sealing ring, etc., may also be provided between the first box body part 5a and the second box body part 5b.

[0088] Assuming that the first box body portion 5a covers the top of the second box body portion 5b, the first box body portion 5a can also be called an upper box cover, and the second box body portion 5b can also be called a lower box.

[0089] In the battery device 2, there can be multiple battery cells 6, and the multiple battery cells 6 can be connected in series, in parallel, or in mixed connection. Mixed connection means that the multiple battery cells 6 are both connected in series and in parallel. The multiple battery cells 6 can be directly connected in series, in parallel, or in mixed connection, and then the whole formed by the multiple battery cells 6 is accommodated in the box 5; of course, the battery device 2 can also be a battery module formed by connecting multiple battery cells 6 in series, in parallel, or in mixed connection, and then the multiple battery modules are connected in series, in parallel, or in mixed connection to form a whole, and accommodated in the box 5. The battery device 2 can also include other structures, for example, the battery device 2 can also include a busbar component for realizing electrical connection between the multiple battery cells 6.

[0090] For example, the battery cell 6 may be the smallest unit constituting the battery device 2 .

[0091] Figure 3 Schematic diagram of the exploded structure of a battery cell provided in some embodiments of the present application. Figure 3 The battery cell 6 includes an electrode assembly 10 and a shell 20 , and the electrode assembly 10 is disposed in the shell 20 .

[0092] The housing 20 is used to encapsulate the electrode assembly 10 and the electrolyte and other components. The housing 20 can be a steel housing, an aluminum housing, a plastic housing (such as polypropylene), a composite metal housing (such as a copper-aluminum composite housing) or an aluminum-plastic film.

[0093] In some embodiments, the housing 20 is a hollow structure, and a space for accommodating the electrode assembly 10 and the electrolyte is formed therein. The shape of the housing 20 can be determined according to the specific shape of the electrode assembly 10. For example, if the electrode assembly 10 is a rectangular parallelepiped structure, a rectangular housing can be selected.

[0094] The material of the housing 20 can be various, for example, the material of the housing 20 can be metal or plastic. Optionally, the material of the housing 20 can be copper, iron, aluminum, steel, aluminum alloy, etc. Exemplarily, the housing 20 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.

[0095] As an example, the housing 20 includes a shell 21 and an end cover 22 . The shell 21 has an opening 211 , and the end cover 22 is used to cover the opening 211 .

[0096] The housing 21 is a component used to cooperate with the end cover 22 to form an internal cavity of the battery cell 6. The formed internal cavity can be used to accommodate the electrode assembly 10, electrolyte and other components.

[0097] The housing 21 and the end cap 22 may be independent components. For example, an opening 211 may be provided on the housing 21 , and the end cap 22 may cover the opening 211 at the opening 211 to form an internal cavity of the battery cell 6 .

[0098] The shape of the end cap 22 can be adapted to the shape of the housing 21 to match the housing 21. The material of the end cap 22 can be the same as or different from that of the housing 21.

[0099] The end cover 22 can be connected to the housing 21 by welding, bonding, clamping or other methods.

[0100] The shell 21 may have an opening 211 at one end or at both ends. Exemplarily, the shell 21 has an opening 211 at one end, and one end cap 22 is provided to cover the opening 211 of the shell 21. As another example, the shell 21 may also have an opening 211 at both ends, and two end caps 22 are provided, and the two end caps 22 cover the two openings 211 of the shell 21, respectively.

[0101] Figure 4 yes Figure 3 A schematic cross-sectional view of a battery cell is shown, Figure 5 yes Figure 4 Schematic diagram of the enlarged structure of area A in the middle. Figure 6 yes Figure 5Schematic diagram of the decomposition structure, Figure 7 is a partial structural cross-sectional view of a battery cell provided in some other embodiments of the present application, Figure 8 is a partial structural cross-sectional view of a battery cell provided in some embodiments of the present application, Fig. 9 is a partial structural cross-sectional view of a battery cell provided in some embodiments of the present application, Fig.10 yes Fig. 9 Schematic diagram of the enlarged structure of area B in the middle. Fig.11 is along Figure 4 A cross-sectional view taken from the direction CC in the figure, Fig.12 yes Fig.11 Schematic diagram of the enlarged structure of area D in the middle. Fig.13 is a schematic diagram of the structure of an electrode assembly of a battery cell provided in some embodiments of the present application, Fig.14 yes Fig.13 Schematic diagram of the enlarged structure of the middle area E, Fig.15 yes Figure 4 Schematic diagram of the enlarged structure of area F in the middle.

[0102] Reference Figures 4 to 15 The battery cell 6 provided in the embodiment of the present application includes an electrode assembly 10, a shell 20, a first electrode terminal 30, a busbar 40, a conductive component 50 and a first insulating member 60. The shell 20 includes a wall portion 23, and the wall portion 23 is provided with an electrode lead-out hole 231. The electrode assembly 10 is accommodated in the shell 20, and the electrode assembly 10 includes a main body 11 and a first electrode tab 12 led out from the main body 11. The first electrode terminal 30 is directly connected to the first electrode tab 12, and at least part of the first electrode terminal 30 is accommodated in the electrode lead-out hole 231. The busbar 40 is arranged on the side of the wall portion 23 facing away from the main body 11, and the busbar 40 is directly connected to the first electrode terminal 30. The conductive component 50 is arranged on the wall portion 23 and surrounds the first electrode terminal 30. In the thickness direction X of the wall portion 23, at least part of the conductive component 50 is arranged between the busbar 40 and the wall portion 23, and the conductive component 50 is electrically connected to the busbar 40 and the first electrode terminal 30. The first insulating member 60 is at least partially disposed between the conductive component 50 and the wall portion 23 .

[0103] The wall portion 23 may be the end cover 22, or may be one of the shell walls of the shell 21. Figure 3 and Figure 4 In the illustrated embodiment, the wall portion 23 is an end cap 22 .

[0104] The main body 11 is the core part of the electrode assembly 10 to realize the charging and discharging functions. The first electrode tab 12 can be led out from one end of the main body 11 close to the wall 23, or from other ends of the main body 11. Figure 3In the illustrated embodiment, the first electrode tab 12 is led out from one end of the main body 11 close to the wall portion 23 , so as to facilitate the connection between the first electrode tab 12 and the first electrode terminal 30 .

[0105] The first electrode terminal 30 can be directly connected to the first electrode tab 12 by welding, bonding or other suitable methods. Optionally, the first electrode terminal 30 can be welded to the first electrode tab 12 by ultrasonic, laser or other methods.

[0106] The first electrode terminal 30 may be entirely accommodated in the electrode lead-out hole 231 , or only a portion of the electrode lead-out hole 231 may be accommodated in the electrode lead-out hole 231 . Another portion of the first electrode terminal 30 may, for example, extend out of the electrode lead-out hole 231 along the thickness direction X to facilitate connection with the first electrode tab 12 and / or the busbar component 40 .

[0107] The busbar component 40 may be directly connected to the first electrode terminal 30 by welding, clamping, bonding or other suitable methods. Optionally, the busbar component 40 and the first electrode terminal 30 may be penetrated welded or butt welded by laser.

[0108] In some examples, the conductive component 50 may be partially accommodated in the electrode lead-out hole 231 and partially located outside the electrode lead-out hole 231, and at least the portion of the conductive component 50 located outside the electrode lead-out hole 231 is located between the wall portion 23 and the current collector 40 in the thickness direction X. In other examples, the conductive component 50 may also be entirely disposed outside the electrode lead-out hole 231 and located between the wall portion 23 and the current collector 40 in the thickness direction X.

[0109] The conductive component 50 may be an annular structure disposed around the first electrode terminal 30. The conductive component 50 may be provided with a first through hole 56, which penetrates the conductive component 50 along the thickness direction X. At least a portion of the first electrode terminal 30 is accommodated in the first through hole 56. The portion of the first electrode terminal 30 accommodated in the first through hole 56 may be electrically connected to the conductive component 50.

[0110] The first insulating member 60 may be disposed entirely between the conductive component 50 and the wall portion 23 , or only a portion of the first insulating member 60 may be disposed between the conductive component 50 and the wall portion 23 . The first insulating member 60 can insulate and isolate the conductive component 50 and the wall portion 23 .

[0111] When assembling the battery cell 6, the first electrode tab 12 can be connected to the first electrode terminal 30 first, and then the electrode assembly 10 and the first electrode terminal 30 are installed in the outer shell 20 together, and a portion of the first electrode terminal 30 is exposed from the electrode lead-out hole 231 to the outer side of the wall portion 23 facing away from the main body 11, and finally the first electrode terminal 30 and the busbar component 40 are connected.

[0112] Optionally, the first electrode terminal 30 and the busbar component 40 can be welded on the outer side of the wall portion 23 facing away from the main body portion 11, which can reduce the possibility of welding particles generated during the welding process falling into the side of the first electrode terminal 30 facing the main body portion 11, reduce the risk of internal short circuit in the battery cell 6, and help improve the reliability of the battery cell 6.

[0113] In the embodiment of the present application, the busbar component 40 is pre-connected to the first electrode terminal 30. After the battery cells 6 are stacked, the busbar component 40 can be brought in and positioned, which is conducive to simplifying the assembly process. In addition, the embodiment of the present application also sets a conductive component 50 between the busbar component 40 and the wall portion 23. The conductive component 50 is electrically connected to the busbar component 40 and the first electrode terminal 30. The conductive component 50 can not only limit the deformation of the busbar component 40 toward the wall portion 23, reducing the risk of short circuit caused by contact between the busbar component 40 and the wall portion 23, but also form an additional flow path between the busbar component 40 and the first electrode terminal 30, increase the flow area, and help improve the flow capacity of the battery cell 6.

[0114] Furthermore, the first electrode terminal 30 is directly connected to the busbar component 40 and the first electrode tab 12 . The first electrode tab 12 and the busbar component 40 can directly form a current path through the first electrode terminal 30 , which can reduce the number of connections between components, simplify the assembly process, and improve assembly efficiency.

[0115] In some embodiments, the battery cell 6 further includes an insulating support member, which is disposed on the main body 11 and between the main body 11 and the first electrode terminal 30. The insulating support member can be used to support the first electrode terminal 30, which is conducive to reducing the difficulty of connecting the first electrode terminal 30 and the busbar component 40 and improving the connection effect between the two.

[0116] Optionally, the insulating support member may be an insulating film, an insulating bracket or other components that can perform insulating and supporting functions.

[0117] In some embodiments, at least one of the first electrode terminal 30 and the bus member 40 is welded to the conductive member 50 .

[0118] In some examples, of the first electrode terminal 30 and the busbar component 40 , only the first electrode terminal 30 is welded to the conductive component 50 . For example, the portion of the first electrode terminal 30 received in the first through hole 56 may be butt-welded to the conductive component 50 .

[0119] In other examples, of the first electrode terminal 30 and the busbar component 40, only the busbar component 40 is welded to the conductive component 50. Exemplarily, along the direction from the wall portion 23 to the main body portion 11, the busbar component 40 may cover at least a portion of the conductive component 50, and the busbar component 40 and the conductive component 50 may be welded by laser penetration.

[0120] In some other examples, the first electrode terminal 30 and the busbar component 40 are both welded to the conductive component 50. The first electrode terminal 30, the busbar component 40, and the conductive component 50 may be welded to form a welded portion in one welding operation, or the first electrode terminal 30 and the busbar component 40 may be welded to the conductive component 50 in different welding operations.

[0121] At least one of the first electrode terminal 30 and the busbar component 40 is welded to the conductive component 50, which can enhance the connection strength between the first electrode terminal 30 and the conductive component 50, and / or between the busbar component 40 and the conductive component 50, which is beneficial to improving the stability of the conductive component 50 and enhancing the electrical connection stability between the conductive component 50 and the first electrode terminal 30, and between the conductive component 50 and the busbar component 40.

[0122] In some embodiments, reference Figure 5 , Figures 7 to 9 The busbar component 40 , the first electrode terminal 30 , and the conductive component 50 are welded to form a first welding portion W1 . In other words, the first welding portion W1 is directly connected to the busbar component 40 , the first electrode terminal 30 , and the conductive component 50 .

[0123] During the welding operation, the adjacent portions of the busbar component 40, the first electrode terminal 30 and the conductive component 50 can be heated by laser or other means, so that at least the adjacent portions of the busbar component 40, the first electrode terminal 30 and the conductive component 50 are melted and fused together, and the fused portions can form a first welding portion W1 after solidification.

[0124] The number of the first welding part W1 may be one or more.

[0125] The first welding portion W1 may be in a strip, ring, arc or other suitable shapes.

[0126] The current collecting component 40 , the first electrode terminal 30 and the conductive component 50 are welded simultaneously, which is beneficial to reducing the number of welding times and improving welding efficiency.

[0127] In some embodiments, reference Figure 5 and Figure 6 The conductive component 50 is provided with a first through hole 56 , which penetrates the conductive component 50 along the thickness direction X of the wall portion 23 , and the outer peripheral surface of the first electrode terminal 30 is welded to the hole wall of the first through hole 56 and forms a part of the first welding portion W1 .

[0128] The cross section of the first through hole 56 perpendicular to the thickness direction X may be circular, rectangular, triangular or other suitable shapes.

[0129] At least a portion of the first electrode terminal 30 is accommodated in the first through hole 56, and at least a portion of the outer circumference of the first electrode terminal 30 accommodated in the first through hole 56 is welded to the hole wall of the first through hole 56. The first welding portion W1 is directly connected to the outer circumference of the portion of the first electrode terminal 30 accommodated in the first through hole 56 and the hole wall of the first through hole 56.

[0130] In some examples, reference Figure 6 , the current collecting component 40 may be provided with a second through hole 41, and in the same plane perpendicular to the thickness direction X, the orthographic projection of the first through hole 56 and the orthographic projection of the second through hole 41 overlap. A portion of the first electrode terminal 30 is accommodated in the second through hole 41, and the portion of the first electrode terminal 30 accommodated in the second through hole 41 is welded to the current collecting component 40. In other words, the outer peripheral surface of the first electrode terminal 30 is welded to the hole wall of the second through hole 41 and forms a portion of the first welding portion W1. The first welding portion W1 is directly connected to the outer peripheral surface of the portion of the first electrode terminal 30 accommodated in the second through hole 41 and the hole wall of the second through hole 41.

[0131] In other examples, refer to Figure 7 , in the same plane perpendicular to the thickness direction X, the orthographic projection of the first through hole 56 is located within the orthographic projection of the busbar component 40. In other words, along the direction from the wall portion 23 to the main body portion 11, the busbar component 40 may cover the first through hole 56. The welding heat may penetrate the busbar component 40 and heat the outer peripheral surface of the first electrode terminal 30 and the hole wall of the first through hole 56, thereby welding the busbar component 40, the first electrode terminal 30 and the conductive component 50.

[0132] In the embodiment of the present application, the first through hole 56 is provided in the conductive component 50, and the first electrode terminal 30 and the conductive component 50 are butt-welded, which is beneficial to reducing welding power, reducing welding heat generation, and improving welding effect.

[0133] In some embodiments, the busbar component 40 is disposed around the first electrode terminal 30 and is welded to the outer periphery of the first electrode terminal 30. In other words, the busbar component 40 and the first electrode terminal 30 may be butt-welded.

[0134] The weld mark between the bus member 40 and the first electrode terminal 30 is directly connected to the outer periphery of the first electrode terminal 30 .

[0135] Optionally, the weld mark between the busbar component 40 and the first electrode terminal 30 can be a ring structure surrounding the first electrode terminal 30 to increase the flow area of ​​the weld mark, which is beneficial to improving the uniformity of the current density between the busbar component 40 and the first electrode terminal 30, reducing the internal resistance, and improving the flow capacity.

[0136] Alternatively, the weld mark between the bus bar part 40 and the first electrode terminal 30 may be a portion of the first welding portion W1 .

[0137] In the embodiment of the present application, the first electrode terminal 30 and the busbar component 40 are butt-welded, which is beneficial to reducing welding power, reducing welding heat generation, and improving welding effect.

[0138] In some embodiments, reference Figure 5 , Figure 6 , Figure 8 and Fig. 9 The busbar component 40 is provided with a second through hole 41 that penetrates the busbar component 40 along the thickness direction X of the wall portion 23 . A portion of the first electrode terminal 30 is received in the second through hole 41 and welded to the busbar component 40 .

[0139] During welding, a portion of the first electrode terminal 30 may be accommodated in the second through hole 41 , and then the busbar component 40 and the first electrode terminal 30 may be butt-welded.

[0140] The weld mark between the busbar member 40 and the first electrode terminal 30 is directly connected to the outer periphery of the first electrode terminal 30 and the hole wall of the second through hole 41 .

[0141] Optionally, the weld mark between the busbar component 40 and the first electrode terminal 30 can be a ring structure surrounding the first electrode terminal 30 to increase the flow area of ​​the weld mark, which is beneficial to improving the uniformity of the current density between the busbar component 40 and the first electrode terminal 30, reducing the internal resistance, and improving the flow capacity.

[0142] Alternatively, the weld mark between the bus bar part 40 and the first electrode terminal 30 may be a portion of the first welding portion W1 .

[0143] In the embodiment of the present application, the first electrode terminal 30 and the busbar component 40 are butt-welded, which is beneficial to reducing welding power, reducing welding heat generation, and improving welding effect.

[0144] In some embodiments, reference Figure 5 , Figure 6 , Figure 8 and Fig. 9 Along the thickness direction X of the wall portion 23 , the first electrode terminal 30 has a first surface 30 a facing away from the main body portion 11 , and the busbar component 40 has a second surface 40 a facing away from the main body portion 11 . The first surface 30 a and the second surface 40 a are flush.

[0145] In the embodiment of the present application, the first surface 30a and the second surface 40a are arranged flush, which not only facilitates the welding operation, but also allows the weld mark between the busbar component 40 and the first electrode terminal 30 to be connected to the first surface 30a and the second surface 40a, which is beneficial to enhance the welding strength between the busbar component 40 and the first electrode terminal 30, increase the weld mark area between the two, and improve the current carrying capacity.

[0146] In some embodiments, reference Figure 7 The surface of the busbar member 40 facing the wall portion 23 abuts against the first electrode terminal 30 .

[0147] The busbar component 40 may be stacked with the first electrode terminal 30 along the thickness direction X. The busbar component 40 and the first electrode terminal 30 may be welded by laser penetration. The weld mark between the busbar component 40 and the first electrode terminal 30 may be connected to the surface of the first electrode terminal 30 facing the busbar component 40 along the thickness direction X, or may be connected to the outer peripheral surface of the first electrode terminal 30.

[0148] The busbar component 40 abuts against the first electrode terminal 30 , which can increase the contact area between the busbar component 40 and the first electrode terminal 30 , thereby increasing the flow area therebetween, which is beneficial to improving the flow capacity.

[0149] In some embodiments, reference Figure 7 The conductive component 50 is provided with a first through hole 56, and the first through hole 56 penetrates the conductive component 50 along the thickness direction X of the wall portion 23. The busbar component 40 includes a busbar body 43 and a weak portion 42, the thickness of the weak portion 42 is less than the thickness of the busbar body 43, and along the thickness direction X of the wall portion 23, the weak portion 42 covers the hole wall of the first through hole 56, and the weak portion 42, the first electrode terminal 30 and the conductive component 50 are welded.

[0150] The thickness direction of the collecting member 40 is parallel to the thickness direction X of the wall portion 23 .

[0151] Optionally, a concave portion may be formed on a side of the conduit component 40 facing away from the wall portion 23 , and a portion of the conduit component 40 corresponding to the concave portion along the thickness direction X may form a weak portion 42 .

[0152] In some examples, the conduit body 43 is disposed around the weak portion 42, and the shape of the weak portion 42 may be adapted to the shape of the first through hole 56. Along the thickness direction X of the wall portion 23, the weak portion 42 may cover the entire first through hole 56.

[0153] In some other examples, the weak portion 42 may also be an annular structure, and the weak portion 42 surrounds a portion of the conduit body 43 .

[0154] In the same plane perpendicular to the thickness direction X, the orthographic projection of the hole wall of the first through hole 56 is located within the orthographic projection of the weak portion 42 .

[0155] During welding, welding heat can penetrate the weak portion 42 and heat the outer peripheral surface of the first electrode terminal 30 and the hole wall of the first through hole 56, thereby welding the weak portion 42, the first electrode terminal 30 and the conductive component 50. Since the thickness of the weak portion 42 is relatively thin, the heat penetration efficiency can be improved, thereby reducing the welding power, reducing the welding heat generation, and improving the welding effect.

[0156] In some embodiments, reference Figures 5 to 9 The surface of the busbar component 40 facing the wall portion 23 abuts against the conductive component 50 .

[0157] The bus member 40 may be stacked with the conductive member 50 along the thickness direction X.

[0158] Optionally, the surface of the conductive component 50 facing the busbar component 40 and the surface of the first electrode terminal 30 facing away from the body 11 may be flush, and the surface of the busbar component 40 facing the wall 23 may abut against the conductive component 50 and the first electrode terminal 30 .

[0159] The abutment between the current collecting component 40 and the conductive component 50 can not only improve the supporting stability of the conductive component 50 on the current collecting component 40 , but also facilitate forming a seal between the current collecting component 40 and the conductive component 50 , thereby improving the sealing performance of the battery cell 6 .

[0160] In some embodiments, reference Figures 5 to 9 The first electrode terminal 30 includes a first terminal portion 31 and a second terminal portion 32. The first terminal portion 31 is provided on the side of the wall portion 23 facing the main body portion 11 and connected to the first electrode tab 12. The second terminal portion 32 protrudes from the surface of the first terminal portion 31 facing the wall portion 23. At least part of the second terminal portion 32 is accommodated in the electrode lead-out hole 231, the conductive component 50 is arranged around the second terminal portion 32, and the second terminal portion 32 is welded to the busbar component 40. In the thickness direction X of the wall portion 23, a part of the wall portion 23 is located between the first terminal portion 31 and the busbar component 40.

[0161] The first terminal portion 31 may be connected to the first electrode tab 12 by welding or other suitable methods.

[0162] Optionally, at least a portion of the second terminal portion 32 is passed through the first through hole 56 of the conductive component 50 and welded to the busbar component 40. The weld mark between the second terminal portion 32 and the busbar component 40 may be connected to the outer peripheral surface of the second terminal portion 32 and the surface of the second terminal portion 32 facing away from the main body 11. The surface of the second terminal portion 32 facing away from the main body 11 forms the first surface 30a of the first electrode terminal 30.

[0163] In the embodiment of the present application, the first terminal portion 31 is disposed on the side of the wall portion 23 facing the main body portion 11, which is conducive to shortening the length of the first electrode tab 12 being led out from the main body portion 11, facilitating the connection between the first terminal portion 31 and the first electrode tab 12; and it can also reduce the risk of the first electrode terminal 30 being detached from the electrode lead-out hole 231. The second terminal portion 32 protrudes from the first terminal portion 31, which can enhance the overall strength of the first electrode terminal 30 and reduce the risk of its deformation during welding.

[0164] In some embodiments, the second terminal portion 32 is a solid structure.

[0165] Optionally, the surface of the first terminal portion 31 facing the main body portion 11 may be a continuous surface.

[0166] The second terminal portion 32 is not provided with a recess, a through hole or other structures, which can increase the flow area of ​​the second terminal portion 32 and enhance the deformation resistance of the second terminal portion 32 itself, which is beneficial to improving the flow capacity and overall strength of the first electrode terminal 30 .

[0167] In some embodiments, reference Fig. 9 and Fig.10 The second terminal portion 32 includes a first sub-portion 321 and a second sub-portion 322 connected to each other, the first sub-portion 321 is connected to the first terminal portion 31 and is formed integrally with the first terminal portion 31, and along the thickness direction X of the wall portion 23, at least a portion of the second sub-portion 322 is located on a side of the first sub-portion 321 that is away from the main body portion 11. The base metals of the first sub-portion 321 and the second sub-portion 322 are different, the base metals of the second sub-portion 322 and the busbar component 40 are the same, and the second sub-portion 322 is welded to the busbar component 40.

[0168] Optionally, the first sub-section 321 and the second sub-section 322 may be connected by at least one of cold rolling, hot rolling, explosive compounding, and explosive rolling, thereby improving the connection strength and stability between the first sub-section 321 and the second sub-section 322 and reducing the risk of the connection surfaces of the first sub-section 321 and the second sub-section 322 being separated from each other.

[0169] The first sub-portion 321 and the first terminal portion 31 are integrally formed, and the base metal of the first terminal portion 31 and the first sub-portion 321 is the same.

[0170] In the embodiment of the present application, "base metal" refers to the main metal component. The main metal component of the first sub-section 321 is different from the main metal component of the second sub-section 322, and the main metal component of the first sub-section 321 is the same as the main metal component of the first terminal section 31. The main metal component of the second sub-section 322 is the same as the main metal component of the busbar component 40, so that the second sub-section 322 and the busbar component 40 are connected by welding.

[0171] Optionally, the first pole tab 12 is a negative pole tab. The second sub-portion 322 and the current collector 40 may be made of aluminum or an aluminum alloy, and the base metals of the second sub-portion 322 and the current collector 40 are both aluminum. The first sub-portion 321 and the first terminal portion 31 may be made of copper or a copper alloy, and the base metals of the first sub-portion 321 and the first terminal portion 31 are copper, so that the first terminal portion 31 and the first pole tab 12 are connected by welding.

[0172] The embodiment of the present application configures the second terminal portion 32 to include a first sub-portion 321 and a second sub-portion 322 with different base metals, which is beneficial for the first electrode terminal 30 to be respectively connected to the busbar component 40 and the first pole lug 12 with different base metals by welding, thereby improving the connection strength and connection stability between the first electrode terminal 30 and the busbar component 40, and between the first electrode terminal 30 and the first pole lug 12.

[0173] In some embodiments, reference Fig. 9 and Fig.10 The second sub-portion 322 is located on the side of the first sub-portion 321 facing away from the main body 11, and a portion of the first sub-portion 321 protrudes from the outer peripheral surface of the second sub-portion 322 and forms a step surface 321a on the side facing the second sub-portion 322. Along the thickness direction X of the wall portion 23, a portion of the first insulating member 60 is located on the side of the step surface 321a facing the second sub-portion 322 and is clamped between the conductive component 50 and the step surface 321a.

[0174] The first sub-portion 321 and the second sub-portion 322 may both be columnar structures, and the axes of the first sub-portion 321 and the second sub-portion 322 extend along the thickness direction X.

[0175] Optionally, both the first sub-portion 321 and the second sub-portion 322 are cylindrical structures, and a portion of the first sub-portion 321 protrudes radially outward from an outer circumferential surface of the second sub-portion 322 .

[0176] The first sub-portion 321 protrudes from the outer circumference of the second sub-portion 322 and has a step surface 321a on the side close to the second sub-portion 322. A portion of the conductive component 50 is located on the side of the step surface 321a close to the second sub-portion 322, and another portion of the conductive component 50 may be located on the side of the wall portion 23 facing the converging component 40.

[0177] In the thickness direction X, the first insulating member 60 can be tightly fitted to the step surface 321a and the surface of the conductive component 50 facing away from the busbar component 40 along the thickness direction X, and a seal can be formed between the first insulating member 60 and the conductive component 50, and between the first insulating member 60 and the step surface 321a.

[0178] Optionally, the first insulating member 60 may be made of plastic, rubber or other suitable insulating materials, so that the first insulating member 60 can be deformed appropriately, thereby improving its sealing effect.

[0179] In the embodiment of the present application, the first insulating member 60 is partially clamped between the conductive component 50 and the step surface 321a. The first insulating member 60 can be used to achieve sealing between the conductive component 50 and the first sub-portion 321, thereby reducing the possibility of the electrolyte penetrating through the gap between the conductive component 50 and the first sub-portion 321 to the composite surface of the first sub-portion 321 and the second sub-portion 322, which is beneficial to reducing the risk of the first sub-portion 321 and the second sub-portion 322 being corroded due to electrochemical reaction caused by contact with the electrolyte.

[0180] In addition, the first insulating member 60 is partially disposed between the wall portion 23 and the conductive component 50. The insulation isolation between the wall portion 23 and the conductive component 50 and the sealing between the first sub-portion 321 and the conductive component 50 are both achieved through the first insulating member 60, which can reduce the number of components, reduce assembly errors, and help improve assembly efficiency.

[0181] In some embodiments, reference Figure 8 , Fig. 9 and Fig.10 The conductive component 50 is disposed on a side of the wall portion 23 facing away from the electrode assembly 10 , and a portion of the first insulating member 60 is clamped between the wall portion 23 and the conductive component 50 .

[0182] The first insulating member 60 can be closely attached to the surface of the wall 23 away from the main body 11 and the surface of the conductive component 50 facing the wall 23 , and a seal is formed between the first insulating member 60 and the wall 23 and between the first insulating member 60 and the conductive component 50 .

[0183] In the embodiment of the present application, the first insulating member 60 is partially sandwiched between the wall portion 23 and the conductive component 50 , so that the sealing between the wall portion 23 and the conductive component 50 can be achieved through the first insulating member 60 , which is beneficial to improving the sealing performance of the battery cell 6 .

[0184] In some embodiments, reference Fig. 9 and Fig.10 A portion of the first sub-portion 321 is accommodated in the first through hole 56 , and a portion of the first insulating member 60 is clamped between the hole wall of the first through hole 56 and the conductive component 50 .

[0185] A portion of the first insulating member 60 may be closely attached to the hole wall of the first through hole 56 and a portion of the outer circumferential surface of the first sub-portion 321 .

[0186] Optionally, the first insulating member 60 may include a first portion 61 and a second portion 62. The first portion 61 is disposed on the side of the conductive member 50 facing away from the current collecting member 40. A portion of the first portion 61 is sandwiched between the first sub-portion 321 and the conductive member 50, and another portion of the first portion 61 is sandwiched between the conductive member 50 and the step surface 321a. The first portion 61 can form a seal between the conductive member 50 and the wall portion 23, and between the conductive member 50 and the first sub-portion 321. The second portion 62 protrudes from the surface of the first portion 61 facing the conductive member 50 along the thickness direction X, and is sandwiched between the conductive member 50 and the hole wall of the first through hole 56.

[0187] In some embodiments, reference Fig.10 The first insulating member 60 further includes a third portion 63, which protrudes from the surface of the first portion 61 facing away from the conductive component 50 along the thickness direction X. The third portion 63 is at least partially accommodated in the electrode lead-out hole 231 and is located between the hole wall of the electrode lead-out hole 231 and the outer peripheral surface of the first sub-portion 321.

[0188] Optionally, at least one of the hole wall of the electrode lead-out hole 231 and the outer peripheral surface of the first sub-portion 321 is spaced apart from the third portion 63 to facilitate assembly of the first insulating member 60 .

[0189] The third portion 63 can extend the creepage distance of the current between the wall portion 23 and the first sub-portion 321, which is beneficial to reduce the risk of short circuit caused by the overlap of the wall portion 23 and the first sub-portion 321. In addition, the first insulating member 60 can be pre-positioned in the radial direction of the electrode lead-out hole 231 by the third portion 63, which is beneficial to improve the assembly efficiency of the first insulating member 60.

[0190] In some embodiments, the conductive member 50 is welded to at least one of the second sub-portion 322 and the busbar member 40 .

[0191] The conductive component 50 may be an integrally formed structure or may be formed by combining two conductive parts. The base metal of at least part of the conductive component 50 is the same as the base metal of the second sub-part 322 .

[0192] In some examples, the conductive component 50 is only welded to the second sub-portion 322. Optionally, at least a portion of the second sub-portion 322 may be received in the first through hole 56 and butt-welded with the conductive component 50.

[0193] In other examples, the conductive component 50 is only welded to the busbar component 40. Optionally, along the direction of the wall portion 23 pointing to the main body 11, the busbar component 40 may cover at least part of the conductive component 50, and the busbar component 40 and the conductive component 50 may be welded by laser penetration.

[0194] In some other examples, the conductive component 50 can be welded to the second sub-portion 322 and the busbar component 40 at the same time. The second sub-portion 322, the busbar component 40 and the conductive component 50 can be welded to form a welded portion in one welding operation, or the second sub-portion 322 and the busbar component 40 can be welded to the conductive component 50 in different welding operations.

[0195] The base metal of the second sub-section 322 and the convergence component 40 is the same, and the conductive component 50 is welded to at least one of the second sub-section 322 and the convergence component 40, which helps to reduce the difficulty of welding between the conductive component 50 and the second sub-section 322, and / or between the conductive component 50 and the convergence component 40, and improve the welding effect.

[0196] The conductive component 50 is welded to at least one of the second sub-portion 322 and the busbar component 40, which can enhance the connection strength between the second sub-portion 322 and the conductive component 50, and / or between the busbar component 40 and the conductive component 50, and is conducive to improving the stability of the conductive component 50. In addition, when the second sub-portion 322 and the busbar component 40 are both welded to the conductive component 50, an additional current flow path can be formed between the second sub-portion 322, the conductive component 50 and the busbar component 40, which is conducive to reducing the risk of connection failure between the first electrode terminal 30 and the busbar component 40.

[0197] In some embodiments, reference Fig. 9 and Fig.10 The conductive component 50 includes a first conductive portion 51 and a second conductive portion 52 connected to each other. Along the thickness direction X of the wall portion 23, at least a portion of the second conductive portion 52 is located on the side of the first conductive portion 51 that is away from the main body portion 11. The first conductive portion 51 surrounds the first sub-portion 321. The base metal of the first conductive portion 51 is the same as that of the first sub-portion 321. The base metal of the second conductive portion 52 is the same as that of the second sub-portion 322. The second conductive portion 52 is welded to at least one of the second sub-portion 322 and the current collecting component 40.

[0198] Optionally, the first conductive part 51 and the second conductive part 52 can be connected by at least one of cold rolling, hot rolling, explosive compounding, and explosive rolling. This helps to improve the connection strength and stability between the first conductive part 51 and the second conductive part 52, and reduces the risk of the connection surfaces of the first conductive part 51 and the second conductive part 52 being separated from each other.

[0199] The second conductive portion 52 may surround the second sub-portion 322 and be butt-welded with the second sub-portion 322 .

[0200] The first conductive portion 51 may surround a portion of the second sub-portion 322 , or may be completely offset from the second sub-portion 322 along the thickness direction X.

[0201] Optionally, the connection surface between the first conductive part 51 and the second conductive part 52, and the connection surface between the first sub-part 321 and the second sub-part 322 can be flush along the thickness direction X. As a result, it is not easy to form an interface with different base metals between the first conductive part 51 and the second sub-part 322, and between the second conductive part 52 and the first sub-part 321, which is conducive to reducing the number and area of ​​interfaces with different base metals, and reducing the risk of corrosion of the conductive component 50 and the first electrode terminal 30 due to contact with the electrolyte.

[0202] Optionally, the first through hole 56 may be a circular hole, the first conductive portion 51 and the first sub-portion 321 are opposite to each other along the radial direction of the first through hole 56 , and the second conductive portion 52 and the second sub-portion 322 are opposite to each other along the radial direction of the first through hole 56 .

[0203] In the embodiment of the present application, the conductive component 50 is configured to include a first conductive part 51 and a second conductive part 52 with different base metals. The base metal of the first conductive part 51 surrounding the first sub-part 321 is the same as the base metal of the first sub-part 321. It is not easy to form an interface with different base metals between the first sub-part 321 and the first conductive part 51, which is conducive to reducing the risk of corrosion of the first sub-part 321 and the first conductive part 51 due to contact with the electrolyte. In addition, the base metal of the second conductive part 52 at least partially located on the side of the first conductive part 51 facing away from the main body 11 is the same as the base metal of the second sub-part 322. The second conductive part 52 can be connected to the second sub-part 322 and / or the converging component 40 by welding, which is conducive to reducing the difficulty of welding and improving the welding effect.

[0204] In some embodiments, the base metal of the first sub-portion 321 is copper, and the base metal of the second sub-portion 322 is aluminum.

[0205] Accordingly, the base metal of the first conductive part 51 is copper, and the base metals of the second conductive part 52 and the busbar component 40 are both aluminum.

[0206] The first pole tab 12 is a negative pole tab, and the negative pole tab is made of copper. In the embodiment of the present application, the base metal of the first sub-section 321 is set to copper, which is convenient for welding between the first sub-section 321 and the first pole tab 12. In the embodiment of the present application, the base metal of the second sub-section 322 is set to aluminum, which is convenient for welding between the second sub-section 322 and the converging component 40, and is conducive to reducing costs.

[0207] In some embodiments, reference Figures 11 to 14 Along the thickness direction X of the wall portion 23 , a portion of the first electrode tab 12 is located on a side of the first terminal portion 31 facing the wall portion 23 , and is connected to the first terminal portion 31 .

[0208] Along the thickness direction X, a portion of the first electrode tab 12 may be located between the first terminal portion 31 and the wall portion 23 .

[0209] Optionally, the first pole ear 12 may include a folded section 121, a bent section 122 and an extended section 123, the folded section 121 is located on the side of the first terminal portion 31 facing the main body portion 11 and is connected to the main body portion 11, the bent section 122 is located on the side of the first terminal portion 31 along the width direction Y of the wall portion 23, the bent section 122 is connected between the folded section 121 and the extended section 123, and the extended section 123 extends from the bent section 122 to between the wall portion 23 and the first terminal portion 31.

[0210] The gathered section 121 is a portion of the first electrode tab 12 for direct connection with the main body 11 . The gathered section 121 may extend from one end of the main body 11 facing the wall 23 to one side of the first terminal 31 along the width direction Y of the wall 23 .

[0211] The bending section 122 is bent relative to the gathering section 121 and the extending section 123. Optionally, the bending section 122 may be bent into an arc shape.

[0212] Optionally, the number of electrode assemblies 10 may be two, and the two electrode assemblies 10 are stacked along the width direction Y of the wall portion 23. The first pole tabs 12 of the two electrode assemblies 10 are both connected to the first terminal portion 31. The bending sections 122 of the first pole tabs 12 of the two electrode assemblies 10 are respectively located on opposite sides of the first terminal portion 31 along the width direction Y, and the extension sections 123 of the first pole tabs 12 of the two electrode assemblies 10 extend toward each other along the width direction Y.

[0213] The extension section 123 may be welded to the first terminal portion 31 by laser welding or other suitable methods.

[0214] A portion of the first pole tab 12 is located on the side of the first terminal portion 31 facing the wall portion 23, and a portion of the first pole tab 12 (such as the bent section 122) and the first terminal portion 31 can share at least part of the space in the thickness direction X, which is beneficial to improving space utilization. In addition, the first pole tab 12 only needs to be bent once, and there is no need to reserve a large bending space for the first pole tab 12 between the first terminal portion 31 and the main body 11, which is beneficial to improving the space utilization in the housing 20 and improving the energy density of the battery cell 6.

[0215] In some embodiments, reference Figures 5 to 7, the conductive component 50 is welded to at least one of the first electrode terminal 30 and the current collecting component 40. The conductive component 50 includes a conductive body 53, a first limiting portion 54 and a second limiting portion 55. The first limiting portion 54 is at least partially disposed on the side of the wall portion 23 away from the electrode assembly 10, and the second limiting portion 55 is at least partially disposed on the side of the wall portion 23 facing the electrode assembly 10. A portion of the conductive body 53 is accommodated in the electrode lead-out hole 231 and connected to the first limiting portion 54 and the second limiting portion 55. Along the thickness direction X of the wall portion 23, a portion of the first electrode tab 12 is located between the second limiting portion 55 and the first terminal portion 31, and is connected to the second limiting portion 55.

[0216] The conductive body 53 is inserted into the first electrode lead-out hole 231, and a portion of the conductive body 53 may extend out of the electrode lead-out hole 231 along the thickness direction X. The first stopper 54 may be connected to an end of the conductive body 53 away from the main body 11 along the thickness direction X, and the second stopper 55 may be connected to an end of the conductive body 53 close to the main body 11 along the thickness direction X.

[0217] Optionally, the conductive body 53, the first limiting portion 54 and the second limiting portion 55 are an integrally formed structure. At least one of the first limiting portion 54 and the second limiting portion 55 can be formed by riveting.

[0218] The conductive body 53 may be a hollow cylindrical structure or a solid columnar structure.

[0219] The conductive body 53 has an outer circumferential surface surrounding the central axis thereof, and the first limiting portion 54 and the second limiting portion 55 can be connected and protrude from the outer circumferential surface of the conductive body 53 .

[0220] Optionally, at least part of the second limiting portion 55 may be located between the wall portion 23 and the first terminal portion 31 along the thickness direction X. The second limiting portion 55 and the first terminal portion 31 may be spaced apart to reduce the possibility of interference between the second limiting portion 55 and the first terminal portion 31, which is beneficial to the connection between the first electrode terminal 30 and the busbar component 40.

[0221] At least part of the first limiting portion 54 and at least part of the second limiting portion 55 are respectively arranged on both sides of the wall portion 23 along the thickness direction X, so as to limit the conductive component 50 in the thickness direction X and reduce the risk of the conductive component 50 falling into or outside the housing 20.

[0222] Along the thickness direction X, a portion of the first electrode tab 12 may be sandwiched between the first terminal portion 31 and the second stop portion 55 . Optionally, at least a portion of the extension section 123 may be sandwiched between the first terminal portion 31 and the second stop portion 55 .

[0223] The portion of the first pole ear 12 located between the second limiting portion 55 and the first terminal portion 31 can contact the second limiting portion 55, thereby being electrically connected to the second limiting portion 55. A current flow path can be formed between the first pole ear 12 and the conductive component 50, and part of the current can be directly transmitted between the first pole ear 12 and the conductive component 50, which is beneficial to improving the current flow capacity of the battery cell 6.

[0224] In some embodiments, reference Figures 5 to 7 The conductive component 50 includes a conductive body 53, a first limiting portion 54 and a second limiting portion 55. The first limiting portion 54 is at least partially disposed on a side of the wall 23 away from the electrode assembly 10, and the second limiting portion 55 is at least partially disposed on a side of the wall 23 facing the electrode assembly 10. A portion of the conductive body 53 is accommodated in the electrode lead-out hole 231 and is connected to the first limiting portion 54 and the second limiting portion 55.

[0225] At least part of the first limiting portion 54 and at least part of the second limiting portion 55 are respectively arranged on both sides of the wall portion 23 along the thickness direction X, so as to limit the conductive component 50 in the thickness direction X and reduce the risk of the conductive component 50 falling into or outside the housing 20.

[0226] In some embodiments, reference Figure 8 and Fig. 9 The conductive component 50 is disposed on the side of the wall portion 23 away from the main body portion 11 . The battery cell 6 includes a fixing member 71 , which is at least partially disposed on the side of the conductive component 50 away from the wall portion 23 and connected to the wall portion 23 .

[0227] The fixing member 71 may be an annular structure. For example, the fixing member 71 is a rotating body.

[0228] In some examples, a portion of the fixing member 71 may directly abut against the conductive component 50 along the thickness direction X. The wall portion 23 may be electrically connected to the conductive component 50 through the fixing member 71, so that the wall portion 23 is charged. In other examples, an insulating member may be provided between a portion of the fixing member 71 and the conductive component 50 along the thickness direction X, and a portion of the fixing member 71 may be indirectly pressed and fitted with the conductive component 50 through the insulating member, and the fixing member 71 may be insulated and isolated from the conductive component 50 through the insulating member.

[0229] In some examples, along the thickness direction X, a portion of the fixing member 71 may be disposed on a side of the first conductive portion 51 away from the wall portion 23 and surround the second conductive portion 52, and the fixing member 71 may press the first conductive portion 51 toward the wall portion 23. In other examples, along the thickness direction X, a portion of the fixing member 71 may be disposed on a side of the second conductive portion 52 at least partially away from the wall portion 23, and the fixing member 71 may press the second conductive portion 52 and the first conductive portion 51 toward the wall portion 23.

[0230] Optionally, the fixing member 71 may be made of metal to improve the connection strength and stability between the fixing member 71 and the wall portion 23 .

[0231] The fixing member 71 and the wall portion 23 may be connected and relatively fixed by welding or other suitable means.

[0232] The conductive component 50 is disposed on the side of the wall portion 23 away from the electrode assembly 10 and does not occupy the internal space of the housing 20 . The size of the electrode assembly 10 can be increased within a limited space, thereby increasing the capacity of the battery cell 6 .

[0233] In addition, a portion of the fixing member 71 is arranged on the side of the conductive component 50 away from the wall portion 23. The fixing member 71 can apply a force toward the wall portion 23 to the conductive component 50, which is beneficial for pressing the conductive component 50 against the wall portion 23, thereby achieving the assembly of the conductive component 50 and the wall portion 23, and can also improve the sealing performance of the battery cell 6.

[0234] In some embodiments, reference Figure 8 and Fig. 9 The battery cell 6 further includes a second insulating member 72, which at least partially surrounds the conductive component 50 and is fixed relative to the conductive component 50. A portion of the fixing member 71 may be embedded in the second insulating member 72, and another portion may be connected to the wall portion 23.

[0235] The second insulating member 72 can be made of a high temperature resistant insulating material. Optionally, the second insulating member 72 can be a plastic member. The second insulating member 72 can be disposed on the outer periphery of the conductive member 50 by integral injection molding.

[0236] The second insulating member 72 can enhance the installation stability of the fixing member 71 and reduce the possibility of overlapping between the fixing member 71 and the conductive member 50 or the busbar member, thereby reducing the risk of short circuit.

[0237] In some embodiments, reference Figure 3 , Figure 4 and Fig.15 The electrode assembly 10 further includes a second pole tab 13 extending from the main body 11, and the second pole tab 13 has a polarity opposite to that of the first pole tab 12. The battery cell 6 further includes a second electrode terminal 80 and an adapter 90. The second electrode terminal 80 is disposed on the wall 23 and includes a third terminal portion 81 and a fourth terminal portion 82 connected to each other. The base metals of the third terminal portion 81 and the fourth terminal portion 82 are different. The adapter 90 is connected to the second pole tab 13 and the third terminal portion 81. At least part of the fourth terminal portion 82 is disposed on a side of the third terminal portion 81 that is opposite to the main body 11. The base metal of the fourth terminal portion 82 is the same as the base metal of the current collecting component 40.

[0238] Optionally, the first electrode tab 12 may be a positive electrode tab, and the second electrode tab 13 may be a negative electrode tab. The first electrode terminal 30 may be an integrally formed structure having a single base metal, and the base metal of the first electrode terminal 30 may be the same as the material of the first electrode tab 12 .

[0239] The third terminal portion 81 and the fourth terminal portion 82 can be connected by at least one of cold rolling, hot rolling, explosive compounding, and explosive rolling, thereby improving the connection strength and stability between the third terminal portion 81 and the fourth terminal portion 82 and reducing the risk of the connection surfaces of the third terminal portion 81 and the fourth terminal portion 82 being separated from each other.

[0240] The adapter 90 may be connected to the second electrode tab 13 and the third terminal portion 81 by welding or other suitable means, as long as electrical connection can be achieved between the adapter 90 and the second electrode tab 13 , and between the adapter 90 and the third terminal portion 81 .

[0241] The main metal component of the third terminal portion 81 is different from the main metal component of the fourth terminal portion 82. Optionally, the base metal of the adapter 90 can be the same as the base metal of the third terminal portion 81, so that the adapter 90 can be connected to the third terminal portion 81 by welding, which is conducive to improving the connection strength and connection stability between the two.

[0242] The fourth terminal portion 82 has the same main metal component as the busbar component 40 , so that the busbar component 40 of one battery cell 6 can be welded to the fourth terminal portion 82 of another battery cell 6 , thereby easily realizing the series connection of the two battery cells 6 .

[0243] The fourth terminal portion 82 can be stacked with the third terminal portion 81 along the thickness direction X. The fourth terminal portion 82 can be disposed as a whole on the outer side of the wall portion 23 facing away from the main body portion 11, which is beneficial to reducing the space occupied by the second electrode terminal 80 in the housing 20, improving space utilization, and also facilitating connection with the busbar component 40 of another battery cell 6.

[0244] The embodiment of the present application configures the second electrode terminal 80 to include a third terminal portion 81 and a fourth terminal portion 82 having different base metals, so that the third terminal portion 81 and the fourth terminal portion 82 are respectively connected to the adapter 90 and the busbar component 40 of another battery cell 6, which is beneficial to reduce the connection difficulty and improve the connection reliability.

[0245] In some embodiments, the adapter 90 is welded to the third terminal portion 81 to form a second welding portion W2 , and the second welding portion W2 is exposed on a side of the second electrode terminal 80 away from the main body portion 11 .

[0246] During welding, the third terminal portion 81 and the adapter 90 may be heated by laser or other means, so that the adjacent portions of the third terminal portion 81 and the adapter 90 melt and fuse together, and the fused portions solidify to form a second welding portion W2.

[0247] In some examples, the third terminal portion 81 and at least part of the adapter 90 are stacked along the thickness direction X, and the adapter 90 and the third terminal portion 81 are penetrated and welded by laser or other means. In other examples, the third terminal portion 81 may also have a through hole, and the adapter 90 is at least partially accommodated in the through hole of the third terminal portion 81 and is butt-welded with the adapter 90.

[0248] The second welding portion W2 is exposed on the side of the second electrode terminal 80 away from the main body 11, which means that a part of the second welding portion W2 can be exposed from the outside of the second electrode terminal 80. In other words, the welding surface of the third terminal portion 81 for directly receiving welding heat is located on the side of the third terminal portion 81 facing away from the main body 11, and the welding surface of the third terminal portion 81 is exposed from the outside of the second electrode terminal 80 to directly receive welding heat (for example, receiving irradiated laser). When performing the welding operation, the third terminal portion 81 and the adapter 90 can be heated from the outside of the second electrode terminal 80, so that a part of the second welding portion W2 is exposed from the outside of the second electrode terminal 80. In this way, the possibility of welding particles generated during the welding process falling into the side of the adapter 90 facing the main body 11 can be reduced, and the risk of internal short circuit of the battery cell 6 can be reduced, which is conducive to improving the reliability of the battery cell 6.

[0249] In some embodiments, the base metals of the third terminal portion 81 and the adapter 90 are both copper, and the base metal of the fourth terminal portion 82 is aluminum.

[0250] The second pole tab 13 is a negative pole tab, and the negative pole tab is made of copper. In the embodiment of the present application, the base metal of the adapter 90 is set to copper, which is convenient for welding between the adapter 90 and the second pole tab 13. In the embodiment of the present application, the base metal of the third terminal portion 81 is set to copper, which is convenient for welding between the third terminal portion 81 and the adapter 90.

[0251] The fourth terminal portion 82 is used to connect to the busbar component 40 of another battery cell 6, and the busbar component 40 is used to connect to the positive electrode of another battery cell 6, and the material of the positive electrode is usually aluminum. In the embodiment of the present application, the base metal of the fourth terminal portion 82 is set to aluminum, which facilitates welding between the fourth terminal portion 82 and the busbar component 40 of another battery cell 6.

[0252] In some embodiments, the housing 20 includes a shell 21 and an end cover 22, wherein the shell 21 has an opening 211, and the end cover 22 is connected to the shell 21 and covers the opening 211. The wall portion 23 is the end cover 22.

[0253] The end cover 22 may be connected to the housing 21 by welding, clamping, bonding or other suitable methods.

[0254] The shell 21 and the end cover 22 are separate structures. During assembly, the electrode assembly 10 and the first electrode terminal 30 can be installed in the shell 21 through the opening 211, and then the end cover 22 can be covered on the opening 211, so that at least part of the first electrode terminal 30 is accommodated in the electrode lead-out hole 231 of the end cover 22, and then the first electrode terminal 30 and the busbar component 40 are welded, which is conducive to simplifying the assembly operation and reducing the difficulty of assembly.

[0255] According to the second aspect of the present application, the embodiment of the present application further provides a battery device 2, Fig.16 is a partial structural schematic diagram of a battery device provided in some embodiments of the present application, referring to Figure 2 and Fig.16 The battery device 2 includes a battery cell 6 provided according to any embodiment of the first aspect of the present application.

[0256] In some embodiments, the electrode assembly 10 includes a second electrode tab 13 extending from the main body 11, and the second electrode tab 13 has a polarity opposite to that of the first electrode tab 12. The battery cell 6 also includes a second electrode terminal 80 electrically connected to the second electrode tab 13. The busbar 40 of one battery cell 6 is welded to the second electrode terminal 80 of another battery cell 6.

[0257] In some examples, the first pole tab 12 may be a positive pole tab, and the second pole tab 13 may be a negative pole tab. The first electrode terminal 30 may be an integrally formed structure having a single base metal, and the base metal of the first electrode terminal 30 is the same as the base metal of the busbar component 40. The second electrode terminal 80 may include a third terminal portion 81 and a fourth terminal portion 82 connected to each other and having different base metals, the third terminal portion 81 being connected to the second pole tab 13, and the fourth terminal portion 82 being welded to the busbar component 40 of one battery cell 6.

[0258] In other examples, the first electrode tab 12 may be a negative electrode tab, and the second electrode tab 13 may be a positive electrode tab. The first electrode terminal 30 includes a first terminal portion 31 and a second terminal portion 32 connected to each other and having different base metals, the first terminal portion 31 is connected to the first electrode tab 12, and the second terminal portion 32 is connected to the busbar 40. The second electrode terminal 80 may be an integrally formed structure having a single base metal, and the base metal of the second electrode terminal 80 is the same as the base metal of the busbar 40.

[0259] According to the third aspect of the present application, an embodiment of the present application further provides an electrical device, the electrical device comprising a battery device 2 provided according to any embodiment of the second aspect of the present application, the battery device 2 being used to provide electrical energy.

[0260] The battery cell 6 provided in the embodiment of the present application includes an electrode assembly 10, a shell 20, a first electrode terminal 30, a current collector 40, a conductive component 50, a first insulating component 60, a second electrode terminal 80 and an adapter 90. The shell 20 includes a shell 21 and an end cap 22. The electrode assembly 10 is accommodated in the shell 20, and the electrode assembly 10 includes a main body 11, and a first pole tab 12 and a second pole tab 13 led out from the main body 11. The first electrode terminal 30 is provided on the end cap 22 and directly connected to the first pole tab 12, and the second electrode terminal 80 is provided on the end cap 22 and connected to the second pole tab 13 through the adapter 90. The current collector 40 is provided on the side of the end cap 22 facing away from the main body 11, and a part of the conductive component 50 is provided between the current collector 40 and the end cap 22 in the thickness direction X of the end cap 22. The first insulating component 60 is at least partially provided between the conductive component 50 and the end cap 22. The conductive component 50 is provided with a first through hole 56, and the busbar component 40 is provided with a second through hole 41. A portion of the first electrode terminal 30 is passed through the first through hole 56 and the second through hole 41, and is butt-welded with the conductive component 50 and the busbar component 40 to form a first welding portion W1, and a portion of the first welding portion W1 is exposed on a side of the busbar component 40 away from the end cap 22 along the thickness direction X. The second electrode terminal 80 includes a third terminal portion 81 and a fourth terminal portion 82 provided on a side of the third terminal portion 81 facing away from the main body 11. Along the thickness direction X, at least a portion of the third terminal portion 81 is overlapped and welded with at least a portion of the adapter 90 to form a second welding portion W2, and the second welding portion W2 is exposed on a side of the second electrode terminal 80 facing away from the main body 11. The first electrode terminal 30 includes a first terminal portion 31 disposed on a side of the end cover 22 facing the main body portion 11, the conductive component 50 includes a second limiting portion 55 disposed on a side of the end cover 22 facing the main body portion 11, the second limiting portion 55 is located between the first terminal portion 31 and the end cover 22, a portion of the first electrode tab 12 is located between the first terminal portion 31 and the second limiting portion 55, and is connected to the second limiting portion 55.

[0261] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein 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 application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery cell, characterized in that: include: The housing comprises a wall portion, wherein the wall portion is provided with an electrode lead-out hole; An electrode assembly is contained in the housing, and includes a main body and a first electrode tab extending from the main body; A first electrode terminal, directly connected to the first electrode tab, wherein at least a portion of the first electrode terminal is accommodated in the electrode lead-out hole; A current collecting component is provided on a side of the wall portion facing away from the main body portion, and the current collecting component is directly connected to the first electrode terminal; A conductive component is disposed on the wall portion and is disposed around the first electrode terminal, wherein at least a portion of the conductive component is disposed between the busbar component and the wall portion in a thickness direction of the wall portion, and the conductive component is electrically connected to the busbar component and the first electrode terminal; as well as The first insulating member is at least partially disposed between the conductive component and the wall portion.

2. The battery cell according to claim 1, characterized in that: At least one of the first electrode terminal and the busbar member is welded to the conductive member.

3. The battery cell according to claim 1, characterized in that: The bus member, the first electrode terminal, and the conductive member are welded to form a first welded portion.

4. The battery cell according to claim 3, characterized in that: The conductive component is provided with a first through hole, which penetrates the conductive component along the thickness direction of the wall portion, and the outer peripheral surface of the first electrode terminal is welded to the hole wall of the first through hole and forms a part of the first welding portion.

5. The battery cell according to claim 1, characterized in that: The current collecting component is disposed around the first electrode terminal and is welded to the outer periphery of the first electrode terminal.

6. The battery cell according to claim 1, characterized in that: The confluence component is provided with a second through hole, and the second through hole penetrates the confluence component along the thickness direction of the wall portion; A portion of the first electrode terminal is received in the second through hole and welded to the bus bar.

7. The battery cell according to claim 5 or 6, characterized in that: The first electrode terminal has a first surface facing away from the main body along a thickness direction of the wall portion, and the busbar member has a second surface facing away from the main body, and the first surface and the second surface are flush.

8. The battery cell according to any one of claims 1 to 6, characterized in that: A surface of the busbar member facing the wall portion abuts against the first electrode terminal.

9. The battery cell according to claim 8, characterized in that: The conductive component is provided with a first through hole, and the first through hole penetrates the conductive component along the thickness direction of the wall portion; The busbar component includes a busbar body and a weak portion, the thickness of the weak portion is smaller than that of the busbar body, along the thickness direction of the wall portion, the weak portion covers the hole wall of the first through hole, and the weak portion, the first electrode terminal and the conductive component are welded.

10. The battery cell according to any one of claims 1 to 6, characterized in that: A surface of the busbar member facing the wall portion abuts against the conductive member.

11. The battery cell according to any one of claims 1 to 6, characterized in that: The first electrode terminal comprises a first terminal portion and a second terminal portion, the first terminal portion is disposed on a side of the wall portion facing the main body portion and connected to the first electrode tab, and the second terminal portion protrudes from a surface of the first terminal portion facing the wall portion; At least part of the second terminal portion is accommodated in the electrode lead-out hole, the conductive component is arranged around the second terminal portion, and the second terminal portion is welded to the busbar component; in the thickness direction of the wall portion, a part of the wall portion is located between the first terminal portion and the busbar component.

12. The battery cell according to claim 11, characterized in that: The second terminal portion is a solid structure.

13. The battery cell according to claim 11, characterized in that: The second terminal portion comprises a first sub-portion and a second sub-portion connected to each other, the first sub-portion is connected to the first terminal portion and is formed integrally with the first terminal portion, and along the thickness direction of the wall portion, at least a portion of the second sub-portion is located on a side of the first sub-portion facing away from the main body portion; The first sub-portion and the second sub-portion have different base metals, the second sub-portion and the current collecting component have the same base metal, and the second sub-portion is welded to the current collecting component.

14. The battery cell according to claim 13, characterized in that: The second sub-section is located on a side of the first sub-section facing away from the main body, a portion of the first sub-section protrudes from an outer peripheral surface of the second sub-section and forms a step surface on a side facing the second sub-section; Along the thickness direction of the wall portion, a portion of the first insulating member is located on a side of the step surface facing the second sub-portion and is sandwiched between the conductive component and the step surface.

15. The battery cell according to claim 14, characterized in that: The conductive component is arranged on a side of the wall portion facing away from the electrode assembly, and a portion of the first insulating member is clamped between the wall portion and the conductive component.

16. The battery cell according to claim 13, characterized in that: The conductive member is welded to at least one of the second sub-portion and the current collecting member.

17. The battery cell according to claim 13, characterized in that: The conductive component comprises a first conductive portion and a second conductive portion connected to each other, and along the thickness direction of the wall portion, at least a portion of the second conductive portion is located on a side of the first conductive portion that is away from the main body portion; The first conductive part surrounds the first sub-part, the base metal of the first conductive part is the same as the base metal of the first sub-part, the second conductive part is the same as the base metal of the second sub-part, and the second conductive part is welded to at least one of the second sub-part and the busbar component.

18. The battery cell according to claim 13, characterized in that: The base metal of the first sub-section is copper, and the base metal of the second sub-section is aluminum.

19. The battery cell according to claim 11, characterized in that: Along the thickness direction of the wall portion, a portion of the first electrode tab is located on a side of the first terminal portion facing the wall portion, and is connected to the first terminal portion.

20. The battery cell according to claim 19, characterized in that: The conductive member is welded to at least one of the first electrode terminal and the current collecting member; The conductive component comprises a conductive body, a first limiting portion and a second limiting portion, wherein the first limiting portion is at least partially disposed on a side of the wall away from the electrode assembly, and the second limiting portion is at least partially disposed on a side of the wall facing the electrode assembly, and a portion of the conductive body is accommodated in the electrode lead-out hole and connected to the first limiting portion and the second limiting portion; Along the thickness direction of the wall portion, a portion of the first electrode tab is located between the second limiting portion and the first terminal portion, and is connected to the second limiting portion.

21. The battery cell according to any one of claims 1 to 6, characterized in that: The conductive component includes a conductive body, a first limiting portion and a second limiting portion, wherein the first limiting portion is at least partially disposed on a side of the wall portion away from the electrode assembly, and the second limiting portion is at least partially disposed on a side of the wall portion facing the electrode assembly, and a portion of the conductive body is accommodated in the electrode lead-out hole and connected to the first limiting portion and the second limiting portion.

22. The battery cell according to any one of claims 1 to 6, characterized in that: The conductive component is arranged on a side of the wall portion away from the main body portion; The battery cell includes a fixing member, and the fixing member is at least partially disposed on a side of the conductive component away from the wall portion and connected to the wall portion.

23. The battery cell according to any one of claims 1 to 6, characterized in that: The electrode assembly further includes a second electrode tab extending from the main body, wherein the second electrode tab has a polarity opposite to that of the first electrode tab; The battery cell also includes a second electrode terminal and an adapter, the second electrode terminal is arranged on the wall portion, and includes a third terminal portion and a fourth terminal portion connected to each other, the base metals of the third terminal portion and the fourth terminal portion are different, the adapter is connected to the second electrode tab and the third terminal portion, at least a portion of the fourth terminal portion is arranged on a side of the third terminal portion facing away from the main body portion, and the base metal of the fourth terminal portion is the same as the base metal of the busbar component.

24. The battery cell according to claim 23, characterized in that: The adapter is welded to the third terminal portion to form a second welding portion, and the second welding portion is exposed on a side of the second electrode terminal away from the main body portion.

25. The battery cell according to claim 23, characterized in that: The base metals of the third terminal portion and the adapter are both copper, and the base metal of the fourth terminal portion is aluminum.

26. The battery cell according to any one of claims 1 to 6, characterized in that: The housing comprises a shell and an end cover, the shell has an opening, and the end cover is connected to the shell and covers the opening; The wall portion is the end cover.

27. A battery device, characterized in that: The invention comprises a plurality of battery cells according to any one of claims 1 to 26.

28. The battery device according to claim 27, characterized in that The electrode assembly includes a second electrode tab extending from the main body, wherein the second electrode tab has a polarity opposite to that of the first electrode tab; The battery cell further includes a second electrode terminal electrically connected to the second electrode tab; The busbar member of one of the battery cells is welded to the second electrode terminal of another of the battery cells.

29. An electrical equipment, characterized in that: Comprising a battery device according to claim 27 or 28, the battery device is used to provide electrical energy.

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