Battery cell, battery device and electrical equipment

Abstract

The present application discloses a battery cell, a battery device and an electrical equipment. The battery cell includes a housing, an electrode assembly, a first electrode terminal, a current collecting component, a conductive component and a first insulating component. 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 received in an electrode lead-out hole of the wall portion. The current collecting component is disposed on a side of the wall portion facing away from the main body portion and is directly connected to the first electrode terminal. The conductive component is disposed on the wall portion and is disposed around the first electrode terminal. In the thickness direction of the wall portion, at least part of the conductive component is disposed between the current collecting component and the wall portion. The conductive component is electrically connected to the current collecting component and the first electrode terminal. The first insulating component is at least partly disposed between the conductive component and the wall portion. An overcurrent path can be formed between the first tab and the current collecting component through the first electrode terminal, which can reduce the number of connections between components, simplify the assembly process and improve the assembly efficiency.

Description

Technical Field

[0001] This application belongs to the technical field of batteries, and particularly 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, laptop computers, battery cars, electric vehicles, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, and electric tools, etc.

[0003] The development of battery technology needs to consider various design factors simultaneously. For example, reliability, energy density, cycle life, processing technology, etc., and also needs to consider the assembly and over-current capacity of the battery. Summary of the Invention

[0004] Embodiments of this application provide a battery cell, a battery device, and an electrical equipment, which are conducive to simplifying the assembly process and improving the over-current capacity.

[0005] According to the first aspect of this application, this application provides a battery cell, which includes a housing, an electrode assembly, a first electrode terminal, a current collecting component, and a conductive component. The housing includes a wall portion, and the wall portion is provided with an electrode lead-out hole. The electrode assembly is accommodated in the housing and includes a main body portion and a first tab led out from the main body portion. 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 portion. The current collecting component is arranged on the 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. 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 part of the conductive component is arranged between the current collecting component and the wall portion, and the conductive component is electrically connected to the current collecting component and the first electrode terminal. A first insulating member is at least partly arranged between the conductive component and the wall portion.

[0006] In the embodiments of this application, the current collecting component is pre-connected to the first electrode terminal. After the battery cells are stacked, the incoming material and positioning of the current collecting component can be realized, which is conducive to simplifying the assembly process. In addition, in the embodiments of this application, a conductive component is also arranged between the current collecting component and the wall portion. The conductive component is electrically connected to the current collecting component and the first electrode terminal. The conductive component can not only limit the deformation of the current collecting component towards the wall portion, reducing the risk of short circuit caused by the contact between the current collecting component and the wall portion, but also additionally form an over-current path between the current collecting component and the first electrode terminal, increasing the over-current area and improving the over-current capacity of the battery cell. The first electrode terminal is directly connected to the current collecting component and the first tab, which can reduce the number of connections between components, simplify the assembly process, and improve the assembly efficiency.

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

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

[0009] In some embodiments, the conductive component is provided with a first through hole that penetrates the conductive component along the thickness direction of the wall portion. 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. Butt welding the first electrode terminal and the conductive component is beneficial to reducing the welding power, reducing the welding heat generation, and improving the welding effect.

[0010] In some embodiments, the busbar component is disposed around the first electrode terminal and welded to the outer peripheral edge of the first electrode terminal. Butt welding the first electrode terminal and the busbar component is beneficial to reducing the welding power, reducing the welding heat generation, and improving the welding effect.

[0011] In some embodiments, the busbar component is provided with a second through hole that penetrates the busbar component along the thickness direction of the wall portion; a part of the first electrode terminal is received in the second through hole and welded to the busbar component. Butt welding the first electrode terminal and the busbar component is beneficial to reducing the welding power, reducing the welding heat generation, and improving the 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, and the busbar component has a second surface facing away from the main body portion, and the first surface and the second surface are flush. Thereby, not only is the welding operation facilitated, but also the weld mark between the busbar component 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 busbar component and the first electrode terminal, increasing the weld mark area therebetween, and improving the current-carrying capacity.

[0013] In some embodiments, the surface of the busbar component facing the wall portion abuts against the first electrode terminal. Thereby, the contact area between the busbar component and the first electrode terminal can be increased, so as to increase the current-carrying area therebetween, which is beneficial to improving the current-carrying capacity.

[0014] In some embodiments, the conductive component is provided with a first through hole that 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 smaller than that 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 through 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 can the support stability of the conductive component to the current collecting component be improved, but also it is beneficial to form a seal between the current collecting component and the conductive component, 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 disposed on the side of the wall portion facing the main body portion and is connected to the first tab. The second terminal portion protrudes from the surface of the first terminal portion facing the wall portion; at least a part of the second terminal portion is received in the electrode lead-out hole, the conductive component is disposed 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 disposed on the side of the wall portion facing the main body portion, which is beneficial to shortening the length of the first tab led out from the main body portion and facilitating the connection between the first terminal portion and the first tab; and also, it can 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 structures such as recesses and through holes, which can increase the current-carrying area of the second terminal portion, enhance the anti-deformation ability of the second terminal portion itself, and is beneficial to improving the current-carrying 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 is integrally formed with the first terminal portion. Along the thickness direction of the wall portion, at least a part of the second sub-portion is located on the side of the first sub-portion facing away from the main body portion; the base metals of the first sub-portion and the second sub-portion are different, the base metal of the second sub-portion is the same as that of the current collecting component, and the second sub-portion is welded to the current collecting component. Thereby, it is beneficial for the first electrode terminal to be connected to the current collecting component and the first tab with different base metals by welding, improving the connection strength and connection stability between the first electrode terminal and the current collecting component, as well as between the first electrode terminal and the first tab.

[0019] In some embodiments, the second sub - part is located on a side of the first sub - part facing away from the main body part, and a part of the first sub - part protrudes from the outer peripheral surface of the second sub - part and forms a stepped surface on the side facing the second sub - part; in the thickness direction of the wall part, a part of the first insulating member is located on the side of the stepped surface facing the second sub - part and is clamped between the conductive component and the stepped surface. Thus, the seal between the conductive component and the first sub - part can be achieved through the first insulating member, reducing the possibility of electrolyte penetrating through the gap between the conductive component and the first sub - part to the composite surface of the first sub - part and the second sub - part, which is beneficial to reducing the risk of the first sub - part and the second sub - part being corroded due to an electrochemical reaction caused by contact with the electrolyte. Moreover, the insulation between the wall part and the conductive component and the seal between the first sub - part and the conductive component are both achieved through the first insulating member, which can reduce the number of components and assembly errors, and is beneficial to improving the assembly efficiency.

[0020] In some embodiments, the conductive component is arranged on a side of the wall part facing away from the electrode assembly, and a part of the first insulating member is clamped between the wall part and the conductive component. Thus, the seal between the wall part and the conductive component can be achieved through the first insulating member, 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 - part and the current - collecting component. Thus, the connection strength between the second sub - part and the conductive component and / or between the current - collecting component and the conductive component can be enhanced, which is beneficial to improving the stability of the conductive component. Moreover, when both the second sub - part and the current - collecting component are welded to the conductive component, an additional current - flow path can be formed between the second sub - part, the conductive component, and the current - collecting component, which is beneficial to reducing the risk of connection failure between the first electrode terminal and the current - collecting component.

[0022] In some embodiments, the conductive component includes a first conductive part and a second conductive part connected to each other. In the thickness direction of the wall part, at least part of the second conductive part is located on a side of the first conductive part facing away from the main body part; 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 base metal of 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 current - collecting component. Thus, it is not easy to form an interface with different base metals between the first sub - part and the first conductive part, which is beneficial to reducing the risk of the first sub - part and the first conductive part being corroded due to contact with the electrolyte. Moreover, the base metal of the second conductive part, which is at least partly located on the side of the first conductive part facing away from the main body part, is the same as the base metal of the second sub - part, and the second conductive part can be connected to the second sub - part and / or the current - collecting component by welding, which is beneficial to reducing the welding difficulty 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 tab extending from the main body portion, and the second tab has a polarity opposite to that of the first tab; the battery cell further includes a second electrode terminal and an adapter, the second electrode terminal is disposed 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 tab and the third terminal portion, at least a part of the fourth terminal portion is disposed 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 current collecting component. Thereby, it is convenient for the third terminal portion and the fourth terminal portion to be respectively connected to the adapter and the current collecting component of another battery cell, which is beneficial to reducing the connection difficulty and improving the connection reliability.

[0029] In some embodiments, 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. 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 part of the second welding portion W is exposed on the outside of the second electrode terminal. Thereby, the possibility that the welding particles generated during the welding process fall into the side of the adapter facing the main body portion can be reduced, the risk of internal short circuit of the battery cell can be reduced, and the reliability of the battery cell is beneficial to be improved.

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

[0031] In some embodiments, the outer casing includes a housing and an end cap, the housing has an opening, and the end cap is connected to the housing and covers the opening; the wall portion is the end cap. Thereby, it is beneficial to simplify the assembly operation and reduce the assembly difficulty.

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

[0033] In some embodiments, the electrode assembly includes a second tab extending from the main body portion, and the second tab has a polarity opposite to that of the first tab; the battery cell further includes a second electrode terminal electrically connected to the second tab; the current collecting 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, the embodiment of the present application further provides an electrical device, which includes the battery device provided according to any one of the embodiments of the second aspect of the present application, and the battery device is used to provide electric energy. Brief Description of the Drawings

[0035] To more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings required to be used in the embodiments of the present application. Obviously, the following described drawings are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

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

[0037] Figure 2 It is an exploded structural diagram of a battery device provided by some embodiments of the present application.

[0038] Figure 3 It is an exploded structural diagram of a battery cell provided by some embodiments of the present application.

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

[0040] Figure 5 is Figure 4 An enlarged structural diagram of region A in.

[0041] Figure 6 is Figure 5 An exploded structural diagram of.

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

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

[0044] Figure 9 It is a partial structural cross-sectional view of a battery cell provided by still other embodiments of the present application.

[0045] Figure 10 is Figure 9 An enlarged structural diagram of region B in.

[0046] Figure 11 is along Figure 4 A cross-sectional view taken along direction C-C in.

[0047] Figure 12 is Figure 11 An enlarged structural diagram of region D in.

[0048] Figure 13 It is a schematic structural diagram of an electrode assembly of a battery cell provided by some embodiments of the present application.

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

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

[0051] Figure 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:

[0053] Vehicle 1, battery device 2, controller 3, motor 4;

[0054] Box body 5, first box body part 5a, second box body part 5b, accommodating space 5c;

[0055] 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

[0056] 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.

[0057] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs; 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" and any variations thereof in the specification and claims of this application and the above drawings are intended to cover non-exclusive inclusion. The terms "first", "second", etc. in the specification and claims of this application or the above drawings are used to distinguish different objects and not to describe a specific order or primary-secondary relationship.

[0058] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of this application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments.

[0059] In the description of this application, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", "joined", "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 directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0060] 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 simultaneously, and B exists alone. In addition, the character " / " in this application generally represents an "or" relationship between the associated objects before and after.

[0061] In the embodiments of this application, the same reference numerals represent the same components, and for the sake of brevity, in different embodiments, the detailed description of the same components is omitted. It should be understood that the thickness, length, width, etc. of various components shown in the drawings of the embodiments of this application, as well as the overall thickness, length, width, etc. of the integrated device, are only illustrative and should not constitute any limitation to this application.

[0062] The term "a plurality of" as used in this application means two or more (including two).

[0063] In the embodiments of this application, "parallel" includes not only the case of absolute parallelism but also the case of approximately parallelism as conventionally recognized in engineering; at the same time, "perpendicular" also includes not only the case of absolute perpendicularity but also the case of approximately perpendicularity as conventionally recognized in engineering.

[0064] 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.

[0065] 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.

[0066] 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.

[0067] 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.

[0068] 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.

[0069] 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.

[0070] In some embodiments, a separator is disposed between the positive electrode and the negative electrode.

[0071] 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.

[0072] 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.

[0073] 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.

[0074] In some embodiments, the electrode assembly is a laminate structure.

[0075] 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, parallel, or in a hybrid connection through a busbar component.

[0076] In some embodiments, the battery cell assembly is generally formed by arranging a plurality of battery cells.

[0077] The battery device generally includes a box body for encapsulating one or more battery cells. The box body can prevent liquids or other foreign objects from affecting the charging or discharging of the battery cells.

[0078] As an example, the battery cell assembly can be a battery module, and the battery module is formed by arranging and fixing a plurality of battery cells into an independent module. As an example, the battery module can be formed by bundling a plurality of battery cells with cable ties. The battery cell assembly can be accommodated in the box body by fixing the battery module in the box body. As an example, the box body can 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 body to accommodate the battery cell assembly.

[0079] In some embodiments, the box body can be part of the chassis structure of a vehicle. For example, part of the box body can become at least part of the floor of the vehicle, or part of the box body can become at least part of the crossbeam and longitudinal beam of the vehicle.

[0080] In some embodiments, the battery device can be an energy storage device. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0081] In the related art, the tab is usually connected to the electrode terminal through an adapter. After the battery cells are assembled, a plurality of battery cells are first stacked, and then a plurality of battery cells and a plurality of busbar components are connected to achieve electrical connection between the plurality of battery cells. However, multiple connections are required in sequence between the tab, the adapter, the electrode terminal, and the busbar component. Moreover, during assembly, the battery cells and the busbar components are supplied separately, and the busbar component needs to be positioned during the assembly of the busbar component, resulting in a complex assembly process.

[0082] In some embodiments of the present application, the busbar component can be pre-connected to the electrode terminal of the battery cell. In this way, after the battery cells are stacked, the supply and positioning of the busbar component can be achieved, thereby simplifying the assembly process. However, during the processes of battery cell formation, transportation, etc., since the busbar component is only connected to the electrode terminal of a single battery cell, it is likely to contact the outer shell of the battery cell due to deformation or other reasons, leading to a short-circuit risk.

[0083] In view of this, the embodiments of the present application provide a technical solution, which connects a bus bar component to an electrode terminal, and a conductive component is arranged between the bus bar component and the shell wall of the housing. The conductive component is electrically connected to the bus bar component and the electrode terminal. The conductive component can not only limit the deformation of the bus bar component towards the shell wall of the housing, reduce the risk of contact between the bus bar component and the housing, but also increase the current-carrying area and improve the current-carrying capacity. Moreover, the electrode terminal is directly connected to the tab and the bus bar component, which can reduce the number of connections between components, simplify the assembly process, and improve the assembly efficiency.

[0084] The technical solution provided by the embodiments of the present application is applicable to battery cells, battery devices, and electrical equipment using battery devices.

[0085] The battery device disclosed in the embodiments of the present application can be used in electrical equipment using the battery device as a power source or various energy storage systems using the battery device as an energy storage element. The electrical equipment can be, but is not limited to, mobile phones, tablets, laptop computers, electric toys, power tools, battery cars, electric vehicles, ships, spacecraft, etc. Among them, the electric toys can include fixed or mobile electric toys, such as game consoles, electric vehicle toys, electric ship toys, and electric aircraft toys, etc. The spacecraft can include airplanes, rockets, space shuttles, and spaceships, etc.

[0086] For the convenience of description, the following embodiments take the electrical equipment as a vehicle as an example for illustration.

[0087] Figure 1 is a schematic structural diagram of a vehicle provided by some embodiments of the present application. Referring to Figure 1 , the vehicle 1 can be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, etc. A battery device 2 is arranged inside the vehicle 1. The battery device 2 can be arranged at the bottom, head, or tail of the vehicle 1. The battery device 2 can be used for the power supply of the vehicle 1. For example, the battery device 2 can be used as the operating power source of the vehicle 1. The vehicle 1 can also include a controller 3 and a motor 4. The controller 3 is used to control the battery device 2 to supply power to the motor 4. For example, it is used for the working power requirements during the start, navigation, and driving of the vehicle 1.

[0088] In some embodiments of the present application, the battery device 2 can not only be used as the operating power source of the vehicle 1, but also be used as the driving power source of the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0089] Figure 2 is an exploded structural diagram of a battery device provided by some embodiments of the present application. Referring to Figure 2, the battery device 2 includes a box body 5 and battery cells 6, and the battery cells 6 are accommodated in the box body 5. Among them, the box body 5 is used to provide an accommodation space for the battery cells 6, and the box body 5 can adopt various 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 an accommodation space 5c for accommodating the battery cells 6. The second box body part 5b may be a hollow structure with one end open, and the first box body part 5a may be a plate-like 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 accommodation space 5c; the first box body part 5a and the second box body part 5b may also both 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 of various shapes, such as a cylinder, a cuboid, etc.

[0090] To improve the sealing performance after the connection between the first box body part 5a and the second box body part 5b, a sealing member, such as sealant, sealing ring, etc., may also be provided between the first box body part 5a and the second box body part 5b.

[0091] Assume that the first box body part 5a covers the top of the second box body part 5b. The first box body part 5a can also be called the upper box cover, and the second box body part 5b can also be called the lower box body.

[0092] In the battery device 2, there may be multiple battery cells 6. The multiple battery cells 6 can be connected in series, in parallel, or in a mixed connection. A mixed connection means that there are both series and parallel connections among the multiple battery cells 6. The multiple battery cells 6 can be directly connected in series, in parallel, or in a mixed connection together, and then the whole formed by the multiple battery cells 6 is accommodated in the box body 5; of course, in the battery device 2, multiple battery cells 6 can also be first connected in series, in parallel, or in a mixed connection to form a battery module form, and then multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole and are accommodated in the box body 5. The battery device 2 may also include other structures. For example, the battery device 2 may further include a busbar component for realizing the electrical connection between the multiple battery cells 6.

[0093] Exemplarily, the battery cell 6 can be the smallest unit constituting the battery device 2.

[0094] Figure 3 It is a schematic exploded view of the battery cell provided in some embodiments of the present application. Refer to Figure 3 , the battery cell 6 includes an electrode assembly 10 and a housing 20, and the electrode assembly 10 is disposed inside the housing 20.

[0095] The outer shell 20 is used to encapsulate components such as the electrode assembly 10 and the electrolyte. The outer shell 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.

[0096] In some embodiments, the outer shell 20 is a hollow structure, and an accommodation space for accommodating the electrode assembly 10 and the electrolyte is formed inside it. The shape of the outer shell 20 can be determined according to the specific shape of the electrode assembly 10. For example, if the electrode assembly 10 is a cuboid structure, a cuboid outer shell can be selected.

[0097] The material of the outer shell 20 can be various. For example, the material of the outer shell 20 can be metal or plastic. Optionally, the material of the outer shell 20 can be copper, iron, aluminum, steel, aluminum alloy, etc. Exemplarily, the outer shell 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.

[0098] As an example, the outer shell 20 includes a housing 21 and an end cap 22. The housing 21 has an opening 211, and the end cap 22 is used to cover the opening 211.

[0099] The housing 21 is a component for cooperating with the end cap 22 to form the internal cavity of the battery cell 6. The formed internal cavity can be used to accommodate the electrode assembly 10, the electrolyte, and other components.

[0100] The housing 21 and the end cap 22 can be independent components. Exemplarily, an opening 211 can be provided on the housing 21, and the end cap 22 is covered at the opening 211 to form the internal cavity of the battery cell 6.

[0101] The shape of the end cap 22 can be adapted to the shape of the housing 21 to cooperate with the housing 21. The material of the end cap 22 can be the same as or different from the material of the housing 21.

[0102] The end cap 22 can be connected to the housing 21 by welding, bonding, clamping, or other means.

[0103] The housing 21 can have an opening 211 at one end or at both ends. Exemplarily, the housing 21 is a structure with an opening 211 on one side, and the end cap 22 is provided as one and covers the opening 211 of the housing 21. As another example, the housing 21 can also be a structure with openings 211 on both sides, and the end caps 22 are provided as two, and the two end caps 22 respectively cover the two openings 211 of the housing 21.

[0104] Figure 4 is Figure 3 a schematic cross-sectional view of the shown battery cell, Figure 5 is Figure 4 an enlarged structural schematic view of area A in Figure 6 is Figure 5Schematic diagram of the decomposition structure Figure 7 is a partial cross-sectional view of the battery cell provided by some other embodiments of the present application, Figure 8 is a partial cross-sectional view of the battery cell provided by some other embodiments of the present application, Figure 9 is a partial cross-sectional view of the battery cell provided by some other embodiments of the present application, Figure 10 is Figure 9 an enlarged schematic diagram of region B in Figure 11 is along Figure 4 a cross-sectional schematic diagram taken along direction C-C in Figure 12 is Figure 11 an enlarged schematic diagram of region D in Figure 13 is a schematic diagram of the structure of the electrode assembly of the battery cell provided by some embodiments of the present application, Figure 14 is Figure 13 an enlarged schematic diagram of region E in Figure 15 is Figure 4 an enlarged schematic diagram of region F in

[0105] Referring to Figures 4 to 15 , the battery cell 6 provided by the embodiments of the present application includes an electrode assembly 10, a housing 20, a first electrode terminal 30, a current collecting member 40, a conductive member 50, and a first insulating member 60. The housing 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 housing 20. The electrode assembly 10 includes a main body portion 11 and a first tab 12 led out from the main body portion 11. The first electrode terminal 30 is directly connected to the first tab 12, and at least a part of the first electrode terminal 30 is accommodated in the electrode lead-out hole 231. The current collecting member 40 is provided on a side of the wall portion 23 facing away from the main body portion 11, and the current collecting member 40 is directly connected to the first electrode terminal 30. The conductive member 50 is disposed on the wall portion 23 and surrounds the first electrode terminal 30. In the thickness direction X of the wall portion 23, at least a part of the conductive member 50 is disposed between the current collecting member 40 and the wall portion 23, and the conductive member 50 is electrically connected to the current collecting member 40 and the first electrode terminal 30. The first insulating member 60 is at least partially disposed between the conductive member 50 and the wall portion 23.

[0106] The wall portion 23 may be an end cap 22 or one of the shell walls of the housing 21. Optionally, in the embodiments shown in Figure 3 and Figure 4 , the wall portion 23 is the end cap 22.

[0107] The main body portion 11 is the core part for the electrode assembly 10 to realize the charge and discharge function. The first tab 12 may be led out from one end of the main body portion 11 close to the wall portion 23 or from other ends of the main body portion 11. Optionally, in Figure 3In the illustrated embodiment, the first 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 tab 12 and the first electrode terminal 30.

[0108] The first electrode terminal 30 can be directly connected to the first tab 12 by welding, bonding or other suitable means. Optionally, the first electrode terminal 30 can be welded to the first tab 12 by means such as ultrasonic or laser.

[0109] The first electrode terminal 30 can be entirely received in the electrode lead-out hole 231, or only a part of the first electrode terminal 30 can be received in the electrode lead-out hole 231, and the other part of the first electrode terminal 30 can extend outside the electrode lead-out hole 231 in the thickness direction X, for example, so as to facilitate the connection between the first tab 12 and / or the current collecting member 40.

[0110] The current collecting member 40 can be directly connected to the first electrode terminal 30 by welding, snap connection, bonding or other suitable means. Optionally, the current collecting member 40 and the first electrode terminal 30 can be penetration welded or seam welded by laser.

[0111] In some examples, the conductive member 50 can be partially received in the electrode lead-out hole 231 and partially located outside the electrode lead-out hole 231. In the thickness direction X, at least a part of the conductive member 50 located outside the electrode lead-out hole 231 is located between the wall portion 23 and the current collecting member 40. In other examples, the conductive member 50 can also be entirely provided outside the electrode lead-out hole 231 and located between the wall portion 23 and the current collecting member 40 in the thickness direction X.

[0112] The conductive member 50 can be a ring structure disposed around the first electrode terminal 30. The conductive member 50 can be provided with a first through hole 56, and the first through hole 56 penetrates the conductive member 50 in the thickness direction X. At least a part of the first electrode terminal 30 is received in the first through hole 56. The part of the first electrode terminal 30 received in the first through hole 56 can be electrically connected to the conductive member 50.

[0113] The first insulating member 60 can be entirely provided between the conductive member 50 and the wall portion 23, or only a part of the first insulating member 60 can be provided between the conductive member 50 and the wall portion 23. The first insulating member 60 can insulate and isolate the conductive member 50 and the wall portion 23.

[0114] When assembling the battery cell 6, the first tab 12 can be first connected to the first electrode terminal 30, and then the electrode assembly 10 and the first electrode terminal 30 can be together inserted into the housing 20, and a part of the first electrode terminal 30 is exposed from the electrode lead-out hole 231 to the outside of the wall portion 23 facing away from the main body 11, and finally the first electrode terminal 30 and the current collecting member 40 are connected.

[0115] Optionally, the first electrode terminal 30 and the current collecting member 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 that welding particles generated during the welding process fall onto the side of the first electrode terminal 30 facing the main body portion 11, reduce the risk of internal short circuit of the battery cell 6, and is beneficial to improving the reliability of the battery cell 6.

[0116] In the embodiment of the present application, the current collecting member 40 is pre-connected to the first electrode terminal 30. After the battery cells 6 are stacked, the feeding and positioning of the current collecting member 40 can be realized, which is beneficial to simplifying the assembly process. Moreover, in the embodiment of the present application, a conductive member 50 is further provided between the current collecting member 40 and the wall portion 23. The conductive member 50 is electrically connected to the current collecting member 40 and the first electrode terminal 30. The conductive member 50 can not only limit the deformation of the current collecting member 40 towards the wall portion 23 and reduce the risk of short circuit caused by the contact between the current collecting member 40 and the wall portion 23, but also additionally form an overcurrent path between the current collecting member 40 and the first electrode terminal 30 to increase the overcurrent area, which is beneficial to improving the overcurrent capacity of the battery cell 6.

[0117] Moreover, the first electrode terminal 30 is directly connected to the current collecting member 40 and the first tab 12. The first tab 12 and the current collecting member 40 can directly form an overcurrent path through the first electrode terminal 30, which can reduce the number of connections between components, simplify the assembly process, and improve the assembly efficiency.

[0118] In some embodiments, the battery cell 6 further includes an insulating support member, which is disposed on the main body portion 11 and located between the main body portion 11 and the first electrode terminal 30. The insulating support member can be used to support the first electrode terminal 30, which is beneficial to reducing the connection difficulty between the first electrode terminal 30 and the current collecting member 40 and improving the connection effect therebetween.

[0119] Optionally, the insulating support member can be an insulating film, an insulating bracket or other components that can play an insulating and supporting role.

[0120] In some embodiments, at least one of the first electrode terminal 30 and the current collecting member 40 is welded to the conductive member 50.

[0121] In some examples, among the first electrode terminal 30 and the current collecting member 40, only the first electrode terminal 30 is welded to the conductive member 50. Exemplarily, the portion of the first electrode terminal 30 received in the first through hole 56 can be butt-welded to the conductive member 50.

[0122] In other examples, among the first electrode terminal 30 and the current collecting member 40, only the current collecting member 40 is welded to the conductive member 50. Exemplarily, along the direction from the wall portion 23 to the main body portion 11, the current collecting member 40 can cover at least a part of the conductive member 50, and the current collecting member 40 and the conductive member 50 can be laser penetration welded.

[0123] In still other examples, both the first electrode terminal 30 and the bus bar component 40 are welded to the conductive component 50. The first electrode terminal 30, the bus bar component 40, and the conductive component 50 can be welded to form a welded portion in a single welding operation, or the first electrode terminal 30 and the bus bar component 40 can be separately welded to the conductive component 50 in different welding operations.

[0124] Welding at least one of the first electrode terminal 30 and the bus bar component 40 to the conductive component 50 can enhance the connection strength between the first electrode terminal 30 and the conductive component 50 and / or between the bus bar 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, as well as between the conductive component 50 and the bus bar component 40.

[0125] In some embodiments, referring to Figure 5 、 Figures 7 to 9 , the bus bar component 40, the first electrode terminal 30, and the conductive component 50 are welded to form the first welded portion W1. In other words, the first welded portion W1 is directly connected to the bus bar component 40, the first electrode terminal 30, and the conductive component 50.

[0126] During the welding operation, the adjacent portions of the bus bar component 40, the first electrode terminal 30, and the conductive component 50 can be heated by laser or other means, so that at least a part of the adjacent portions of the bus bar component 40, the first electrode terminal 30, and the conductive component 50 melts and fuses together. After the fused portion solidifies, the first welded portion W1 can be formed.

[0127] The first welded portion W1 can be one or multiple.

[0128] The first welded portion W1 can be in a strip shape, a ring shape, an arc shape, or other suitable shapes.

[0129] Welding the bus bar component 40, the first electrode terminal 30, and the conductive component 50 simultaneously is beneficial to reducing the number of welding times and improving the welding efficiency.

[0130] In some embodiments, referring to Figure 5 and Figure 6 , the conductive component 50 is provided with a first through hole 56. The first through hole 56 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 welded portion W1.

[0131] The cross-section of the first through hole 56 perpendicular to the thickness direction X can be circular, rectangular, triangular, or other suitable shapes.

[0132] At least a part of the first electrode terminal 30 is received in the first through hole 56, and the outer peripheral surface of at least the part of the first electrode terminal 30 received 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 peripheral surface of the part of the first electrode terminal 30 received in the first through hole 56 and the hole wall of the first through hole 56.

[0133] In some examples, referring to Figure 6 , the bus bar component 40 may be provided with a second through hole 41. 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 part of the first electrode terminal 30 is received in the second through hole 41, and the part of the first electrode terminal 30 received in the second through hole 41 is welded to the bus bar 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 part of the first welding portion W1. The first welding portion W1 is directly connected to the outer peripheral surface of the part of the first electrode terminal 30 received in the second through hole 41 and the hole wall of the second through hole 41.

[0134] In other examples, referring 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 bus bar component 40. In other words, along the direction from the wall portion 23 to the main body portion 11, the bus bar component 40 can cover the first through hole 56. The welding heat can penetrate through the bus bar 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 bus bar component 40, the first electrode terminal 30, and the conductive component 50.

[0135] In the embodiments of the present application, by providing the first through hole 56 in the conductive component 50 and enabling butt welding between the first electrode terminal 30 and the conductive component 50, it is beneficial to reduce the welding power, reduce the welding heat generation, and improve the welding effect.

[0136] In some embodiments, the bus bar component 40 is disposed around the first electrode terminal 30 and is welded to the outer peripheral edge of the first electrode terminal 30. In other words, the bus bar component 40 and the first electrode terminal 30 can be butt welded.

[0137] The weld mark between the bus bar component 40 and the first electrode terminal 30 is directly connected to the outer peripheral edge of the first electrode terminal 30.

[0138] Optionally, the weld mark between the bus bar component 40 and the first electrode terminal 30 can be an annular structure surrounding the first electrode terminal 30 to increase the current-carrying area of the weld mark, which is beneficial to improving the uniformity of the current density between the bus bar component 40 and the first electrode terminal 30, reducing the internal resistance, and improving the overcurrent capacity.

[0139] Optionally, the solder mark between the bus bar component 40 and the first electrode terminal 30 may be part of the first welding portion W1.

[0140] In the embodiment of the present application, the first electrode terminal 30 and the bus bar component 40 are butt-welded, which is beneficial to reducing the welding power, reducing the heat generated by welding, and improving the welding effect.

[0141] In some embodiments, referring to Figure 5 、 Figure 6 、 Figure 8 and Figure 9 , the bus bar component 40 is provided with a second through hole 41, and along the thickness direction X of the wall portion 23, the second through hole 41 penetrates through the bus bar component 40. A part of the first electrode terminal 30 is received in the second through hole 41 and welded to the bus bar component 40.

[0142] During welding, a part of the first electrode terminal 30 can be first received in the second through hole 41, and then the bus bar component 40 and the first electrode terminal 30 are butt-welded.

[0143] The solder mark between the bus bar component 40 and the first electrode terminal 30 is directly connected to the outer peripheral edge of the first electrode terminal 30 and the hole wall of the second through hole 41.

[0144] Optionally, the solder mark between the bus bar component 40 and the first electrode terminal 30 may be an annular structure surrounding the first electrode terminal 30, so as to increase the current-carrying area of the solder mark, which is beneficial to improving the uniformity of the current density between the bus bar component 40 and the first electrode terminal 30, reducing the internal resistance, and improving the over-current capacity.

[0145] Optionally, the solder mark between the bus bar component 40 and the first electrode terminal 30 may be part of the first welding portion W1.

[0146] In the embodiment of the present application, the first electrode terminal 30 and the bus bar component 40 are butt-welded, which is beneficial to reducing the welding power, reducing the heat generated by welding, and improving the welding effect.

[0147] In some embodiments, referring to Figure 5 、 Figure 6 、 Figure 8 and Figure 9 , along the thickness direction X of the wall portion 23, the first electrode terminal 30 has a first surface 30a facing away from the main body portion 11, the bus bar component 40 has a second surface 40a facing away from the main body portion 11, and the first surface 30a and the second surface 40a are flush.

[0148] 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 enables the solder joint between the bus bar 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 enhancing the welding strength between the bus bar component 40 and the first electrode terminal 30, increasing the solder joint area therebetween, and improving the current-carrying capacity.

[0149] In some embodiments, referring to Figure 7 , the surface of the bus bar component 40 facing the wall portion 23 abuts against the first electrode terminal 30.

[0150] The bus bar component 40 and the first electrode terminal 30 can be stacked in the thickness direction X. The bus bar component 40 and the first electrode terminal 30 can be welded by laser penetration. The solder joint between the bus bar component 40 and the first electrode terminal 30 can be connected to the surface of the first electrode terminal 30 facing the bus bar component 40 in the thickness direction X, or can also be connected to the outer peripheral surface of the first electrode terminal 30.

[0151] The bus bar component 40 abuts against the first electrode terminal 30, which can increase the contact area between the bus bar component 40 and the first electrode terminal 30, thereby increasing the current-carrying area therebetween, which is beneficial to improving the current-carrying capacity.

[0152] In some embodiments, referring to 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 bus bar component 40 includes a bus bar main body 43 and a weak portion 42, and the thickness of the weak portion 42 is less than the thickness of the bus bar main body 43. 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.

[0153] The thickness direction of the bus bar component 40 is parallel to the thickness direction X of the wall portion 23.

[0154] Optionally, a concave portion may be formed on the side of the bus bar component 40 facing away from the wall portion 23, and the portion of the bus bar component 40 corresponding to the concave portion along the thickness direction X may form the weak portion 42.

[0155] In some examples, the bus bar main 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.

[0156] In other examples, the weak portion 42 may also be an annular structure, and the weak portion 42 surrounds a part of the bus bar main body 43.

[0157] 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.

[0158] During welding, the welding heat can penetrate through the weak part 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 part 42, the first electrode terminal 30 and the conductive component 50. Since the thickness of the weak part 42 is relatively thin, the heat penetration efficiency can be improved, thereby reducing the welding power, reducing the heat generated during welding, and improving the welding effect.

[0159] In some embodiments, referring to Figures 5 to 9 , the surface of the bus bar component 40 facing the wall portion 23 abuts against the conductive component 50.

[0160] The bus bar component 40 and the conductive component 50 can be stacked along the thickness direction X.

[0161] Optionally, the surface of the conductive component 50 facing the bus bar component 40 and the surface of the first electrode terminal 30 facing away from the main body portion 11 can be flush, and the surface of the bus bar component 40 facing the wall portion 23 can abut against the conductive component 50 and the first electrode terminal 30.

[0162] The abutment of the bus bar component 40 and the conductive component 50 can not only improve the support stability of the conductive component 50 for the bus bar component 40, but also help to form a seal between the bus bar component 40 and the conductive component 50, improving the sealing performance of the battery cell 6.

[0163] In some embodiments, referring to 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 disposed on the side of the wall portion 23 facing the main body portion 11 and is connected to the first tab 12. The second terminal portion 32 protrudes from the surface of the first terminal portion 31 facing the wall portion 23. At least a part of the second terminal portion 32 is received in the electrode lead-out hole 231. The conductive component 50 is disposed around the second terminal portion 32, and the second terminal portion 32 is welded to the bus bar 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 bus bar component 40.

[0164] The first terminal portion 31 can be connected to the first tab 12 by welding or other suitable means.

[0165] Optionally, at least a part of the second terminal portion 32 passes through the first through hole 56 of the conductive component 50 and is welded to the bus bar component 40. The welding mark between the second terminal portion 32 and the bus bar component 40 can 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 portion 11. The surface of the second terminal portion 32 facing away from the main body portion 11 forms the first surface 30a of the first electrode terminal 30.

[0166] 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 beneficial to shortening the length of the first tab 12 led out from the main body portion 11 and facilitating the connection between the first terminal portion 31 and the first tab 12; moreover, the risk of the first electrode terminal 30 disengaging from the electrode lead-out hole 231 can also be reduced. 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 the welding process.

[0167] In some embodiments, the second terminal portion 32 has a solid structure.

[0168] Optionally, the surface of the first terminal portion 31 facing the main body portion 11 may be a continuous surface.

[0169] The second terminal portion 32 is not provided with structures such as recesses and through holes, which can increase the current-carrying area of the second terminal portion 32, improve the anti-deformation ability of the second terminal portion 32 itself, and is beneficial to improving the current-carrying capacity and overall strength of the first electrode terminal 30.

[0170] In some embodiments, referring to Figure 9 and Figure 10 , the second terminal portion 32 includes a first sub-portion 321 and a second sub-portion 322 that are connected to each other. The first sub-portion 321 is connected to the first terminal portion 31 and integrally formed with the first terminal portion 31. Along the thickness direction X of the wall portion 23, at least a part of the second sub-portion 322 is located on the side of the first sub-portion 321 facing 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 bus bar component 40 are the same, and the second sub-portion 322 is welded to the bus bar component 40.

[0171] Optionally, the first sub-portion 321 and the second sub-portion 322 can be connected by at least one of cold rolling, hot rolling, explosive cladding method, and explosive rolling method. Thereby, it is beneficial to improving the connection strength and stability between the first sub-portion 321 and the second sub-portion 322, and reducing the risk of the connection surfaces of the first sub-portion 321 and the second sub-portion 322 separating from each other.

[0172] The first sub-portion 321 and the first terminal portion 31 are integrally formed, and the base metals of the first terminal portion 31 and the first sub-portion 321 are the same.

[0173] In the embodiment of the present application, "base metal" refers to the main metal component. The main metal components of the first sub-portion 321 and the second sub-portion 322 are different, the main metal components of the first sub-portion 321 and the first terminal portion 31 are the same. The main metal components of the second sub-portion 322 and the bus bar component 40 are the same, so as to facilitate the connection between the second sub-portion 322 and the bus bar component 40 by welding.

[0174] Optionally, the first tab 12 is a negative tab. The materials of the second sub - part 322 and the current - collecting component 40 can be aluminum or aluminum alloy, and the base metals of both the second sub - part 322 and the current - collecting component 40 are aluminum. The materials of both the first sub - part 321 and the first terminal part 31 can be copper or copper alloy, and the base metal of both the first sub - part 321 and the first terminal part 31 is copper, so as to facilitate the connection between the first terminal part 31 and the first tab 12 by welding.

[0175] In the embodiment of the present application, the second terminal part 32 is arranged to include the first sub - part 321 and the second sub - part 322 with different base metals, which is beneficial for the first electrode terminal 30 to be respectively connected to the current - collecting component 40 and the first tab 12 with different base metals by welding, improving the connection strength and connection stability between the first electrode terminal 30 and the current - collecting component 40, and between the first electrode terminal 30 and the first tab 12.

[0176] In some embodiments, referring to Figure 9 and Figure 10 , the second sub - part 322 is located on the side of the first sub - part 321 facing away from the main body part 11, and a part of the first sub - part 321 protrudes from the outer peripheral surface of the second sub - part 322 and forms a step surface 321a on the side facing the second sub - part 322. Along the thickness direction X of the wall part 23, a part of the first insulating part 60 is located on the side of the step surface 321a facing the second sub - part 322 and is clamped between the conductive component 50 and the step surface 321a.

[0177] Both the first sub - part 321 and the second sub - part 322 can be columnar structures, and the axes of the first sub - part 321 and the second sub - part 322 extend along the thickness direction X.

[0178] Optionally, both the first sub - part 321 and the second sub - part 322 are cylindrical structures, and a part of the first sub - part 321 protrudes radially outward from the outer peripheral surface of the second sub - part 322.

[0179] The part of the first sub - part 321 protruding from the outer peripheral surface of the second sub - part 322 has a step surface 321a on the side close to the second sub - part 322. A part of the conductive component 50 is located on the side of the step surface 321a close to the second sub - part 322, and another part of the conductive component 50 can be located on the side of the wall part 23 facing the current - collecting component 40.

[0180] In the thickness direction X, the first insulating part 60 can be closely attached to the step surface 321a and the surface of the conductive component 50 facing away from the current - collecting component 40 along the thickness direction X, and seals can be formed both between the first insulating part 60 and the conductive component 50 and between the first insulating part 60 and the step surface 321a.

[0181] 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 moderately deformed to improve its sealing effect.

[0182] In the embodiment of the present application, the first insulating member 60 is partially clamped between the conductive member 50 and the stepped surface 321a. The sealing between the conductive member 50 and the first sub - part 321 can be realized through the first insulating member 60, reducing the possibility of electrolyte penetrating through the gap between the conductive member 50 and the first sub - part 321 to the composite surface of the first sub - part 321 and the second sub - part 322, which is beneficial to reducing the risk of electrochemical reaction and corrosion of the first sub - part 321 and the second sub - part 322 due to contact with the electrolyte.

[0183] Moreover, the first insulating member 60 is partially disposed between the wall portion 23 and the conductive member 50. The insulation between the wall portion 23 and the conductive member 50 and the sealing between the first sub - part 321 and the conductive member 50 are both realized through the first insulating member 60, which can reduce the number of components and assembly errors, and is beneficial to improving the assembly efficiency.

[0184] In some embodiments, referring to Figure 8 、 Figure 9 and Figure 10 , the conductive member 50 is disposed on the side of the wall portion 23 facing away from the electrode assembly 10, and a part of the first insulating member 60 is clamped between the wall portion 23 and the conductive member 50.

[0185] The first insulating member 60 can be closely attached to the surface of the wall portion 23 facing away from the main body portion 11 and the surface of the conductive member 50 facing the wall portion 23, and seals are formed between the first insulating member 60 and the wall portion 23, and between the first insulating member 60 and the conductive member 50.

[0186] In the embodiment of the present application, by partially clamping the first insulating member 60 between the wall portion 23 and the conductive member 50, the sealing between the wall portion 23 and the conductive member 50 can be realized through the first insulating member 60, which is beneficial to improving the sealing performance of the battery cell 6.

[0187] In some embodiments, referring to Figure 9 and Figure 10 , a part of the first sub - part 321 is received in the first through - hole 56, and a part of the first insulating member 60 is clamped between the hole wall of the first through - hole 56 and the conductive member 50.

[0188] A part of the first insulating member 60 can be closely attached to the hole wall of the first through - hole 56 and a part of the outer peripheral surface of the first sub - part 321.

[0189] Optionally, the first insulating member 60 may include a first portion 61 and a second portion 62. The first portion 61 is disposed on a side of the conductive member 50 facing away from the bus bar member 40. A part of the first portion 61 is clamped between the first sub - portion 321 and the conductive member 50, and another part of the first portion 61 is clamped between the conductive member 50 and the stepped surface 321a. The first portion 61 can form a seal between the conductive member 50 and the wall portion 23, as well as 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 in the thickness direction X, and is clamped between the conductive member 50 and the hole wall of the first through - hole 56.

[0190] In some embodiments, referring to Figure 10 , the first insulating member 60 further includes a third portion 63, and the third portion 63 protrudes from the surface of the first portion 61 facing away from the conductive member 50 in the thickness direction X. The third portion 63 is at least partially received 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.

[0191] 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 the assembly of the first insulating member 60.

[0192] 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 reducing the risk of short - circuit caused by the overlap of the wall portion 23 and the first sub - portion 321. Also, the first insulating member 60 can be pre - positioned in the radial direction of the electrode lead - out hole 231 through the third portion 63, which is beneficial to improving the assembly efficiency of the first insulating member 60.

[0193] In some embodiments, the conductive member 50 is welded to at least one of the second sub - portion 322 and the bus bar member 40.

[0194] The conductive member 50 can be an integrally formed structure or composed of two composite conductive parts. The base metal of at least part of the conductive member 50 is the same as the base metal of the second sub - portion 322.

[0195] In some examples, the conductive member 50 is only welded to the second sub - portion 322. Optionally, at least part of the second sub - portion 322 can be received in the first through - hole 56 and is butt - welded to the conductive member 50.

[0196] In other examples, the conductive member 50 is only welded to the bus bar member 40. Optionally, along the direction from the wall portion 23 to the main body portion 11, the bus bar member 40 can cover at least part of the conductive member 50, and the bus bar member 40 and the conductive member 50 can be laser - penetration welded.

[0197] In some other examples, the conductive component 50 can be welded to the second sub - part 322 and the bus bar component 40 simultaneously. The second sub - part 322, the bus bar component 40, and the conductive component 50 can be welded to form a welded joint in one welding operation, or the second sub - part 322 and the bus bar component 40 can also be welded to the conductive component 50 separately in different welding operations.

[0198] The base metals of the second sub - part 322 and the bus bar component 40 are the same. Welding the conductive component 50 to at least one of the second sub - part 322 and the bus bar component 40 is beneficial to reducing the welding difficulty between the conductive component 50 and the second sub - part 322, and / or between the conductive component 50 and the bus bar component 40, and improving the welding effect.

[0199] Welding the conductive component 50 to at least one of the second sub - part 322 and the bus bar component 40 can enhance the connection strength between the second sub - part 322 and the conductive component 50, and / or between the bus bar component 40 and the conductive component 50, which is beneficial to improving the stability of the conductive component 50. Moreover, when both the second sub - part 322 and the bus bar component 40 are welded to the conductive component 50, an additional current - flow path can be formed between the second sub - part 322, the conductive component 50, and the bus bar component 40, which is beneficial to reducing the risk of connection failure between the first electrode terminal 30 and the bus bar component 40.

[0200] In some embodiments, referring to Figure 9 and Figure 10 , the conductive component 50 includes a first conductive part 51 and a second conductive part 52 connected to each other. Along the thickness direction X of the wall part 23, at least a part of the second conductive part 52 is located on the side of the first conductive part 51 facing away from the main body part 11. The first conductive part 51 surrounds the first sub - part 321, and the base metal of the first conductive part 51 is the same as that of the first sub - part 321. The base metal of the second conductive part 52 is the same as that of the second sub - part 322, and the second conductive part 52 is welded to at least one of the second sub - part 322 and the bus bar component 40.

[0201] 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 cladding method, and explosive rolling method. Thereby, it is beneficial to improving the connection strength and stability between the first conductive part 51 and the second conductive part 52, and reducing the risk of the connection surfaces of the first conductive part 51 and the second conductive part 52 separating from each other.

[0202] The second conductive part 52 can surround the second sub - part 322 and be seam - welded to the second sub - part 322.

[0203] The first conductive part 51 can surround a part of the second sub - part 322, or can be completely staggered from the second sub - part 322 along the thickness direction X.

[0204] Optionally, along the thickness direction X, 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 - mounted. Thus, 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 beneficial to reducing the number and area of interfaces with different base metals, and reducing the risk of the conductive component 50 and the first electrode terminal 30 being corroded due to contact with the electrolyte.

[0205] Optionally, the first through - hole 56 can be a circular hole, the first conductive part 51 and the first sub - part 321 are opposite to each other along the radial direction of the first through - hole 56, and the second conductive part 52 and the second sub - part 322 are opposite to each other along the radial direction of the first through - hole 56.

[0206] In the embodiment of the present application, the conductive component 50 is arranged 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 beneficial to reducing the risk of the first sub - part 321 and the first conductive part 51 being corroded due to contact with the electrolyte. And, the base metal of the second conductive part 52, which is at least partially located on the side of the first conductive part 51 facing away from the main body part 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 bus bar component 40 by welding, which is beneficial to reducing the welding difficulty and improving the welding effect.

[0207] In some embodiments, the base metal of the first sub - part 321 is copper, and the base metal of the second sub - part 322 is aluminum.

[0208] Correspondingly, the base metal of the first conductive part 51 is copper, and the base metals of the second conductive part 52 and the bus bar component 40 are both aluminum.

[0209] The first tab 12 is a negative tab, and the material of the negative tab is copper. In the embodiment of the present application, the base metal of the first sub - part 321 is set to copper, which is convenient for welding between the first sub - part 321 and the first tab 12. In the embodiment of the present application, the base metal of the second sub - part 322 is set to aluminum, which is convenient for welding between the second sub - part 322 and the bus bar component 40 and is beneficial to reducing costs.

[0210] In some embodiments, referring to Figures 11 to 14 , along the thickness direction X of the wall part 23, a part of the first tab 12 is located on the side of the first terminal part 31 facing the wall part 23 and is connected to the first terminal part 31.

[0211] Along the thickness direction X, a part of the first tab 12 can be located between the first terminal part 31 and the wall part 23.

[0212] Optionally, the first tab 12 may include a converging section 121, a bending section 122, and an extending section 123. The converging 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 bending section 122 is located on one side of the first terminal portion 31 along the width direction Y of the wall portion 23. The bending section 122 is connected between the converging section 121 and the extending section 123. The extending section 123 extends from the bending section 122 to between the wall portion 23 and the first terminal portion 31.

[0213] The converging section 121 is the part of the first tab 12 for directly connecting to the main body portion 11. The converging section 121 may extend from one end of the main body portion 11 facing the wall portion 23 to one side of the first terminal portion 31 along the width direction Y of the wall portion 23.

[0214] The bending section 122 is bent relative to the converging section 121 and the extending section 123. Optionally, the bending section 122 may be bent into an arc shape.

[0215] Optionally, the number of the 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 tabs 12 of the two electrode assemblies 10 are both connected to the first terminal portion 31. The bending sections 122 of the first 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 extending sections 123 of the first tabs 12 of the two electrode assemblies 10 extend towards each other along the width direction Y.

[0216] The extending section 123 may be welded to the first terminal portion 31 by laser welding or other suitable means.

[0217] A part of the first tab 12 is located on the side of the first terminal portion 31 facing the wall portion 23. A part of the first tab 12 (such as the bending section 122) and the first terminal portion 31 may share at least part of the space in the thickness direction X, which is beneficial to improving the space utilization rate. Moreover, the first tab 12 only needs to be bent once, and there is no need to reserve a large bending space for the first tab 12 between the first terminal portion 31 and the main body portion 11, which is beneficial to improving the space utilization rate inside the housing 20 and enhancing the energy density of the battery cell 6.

[0218] In some embodiments, refer to Figures 5 to 7, the conductive component 50 is welded to at least one of the first electrode terminal 30 and the bus bar 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 part of the conductive body 53 is received 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 part of the first tab 12 is located between the second limiting portion 55 and the first terminal portion 31 and connected to the second limiting portion 55.

[0219] The conductive body 53 is inserted into the first electrode lead-out hole 231, and a part of the conductive body 53 can extend out of the electrode lead-out hole 231 along the thickness direction X. The first limiting portion 54 can be connected to one end of the conductive body 53 away from the main body portion 11 along the thickness direction X, and the second limiting portion 55 can be connected to one end of the conductive body 53 close to the main body portion 11 along the thickness direction X.

[0220] Optionally, the conductive body 53, the first limiting portion 54, and the second limiting portion 55 are of an integrally formed structure. At least one of the first limiting portion 54 and the second limiting portion 55 can be formed by a riveting method.

[0221] The conductive body 53 can be a hollow cylindrical structure or a solid columnar structure.

[0222] The conductive body 53 has an outer peripheral surface surrounding its central axis, and the first limiting portion 54 and the second limiting portion 55 can be connected and protrude from the outer peripheral surface of the conductive body 53.

[0223] Optionally, along the thickness direction X, at least a part of the second limiting portion 55 can be located between the wall portion 23 and the first terminal portion 31. A gap can be provided between the second limiting portion 55 and the first terminal portion 31 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 bus bar component 40.

[0224] At least a part of the first limiting portion 54 and at least a part of the second limiting portion 55 are respectively disposed on both sides of the wall portion 23 along the thickness direction X, which can limit the conductive component 50 in the thickness direction X and reduce the risk of the conductive component 50 falling inside or outside the housing 20.

[0225] Along the thickness direction X, a part of the first tab 12 can be clamped between the first terminal portion 31 and the second limiting portion 55. Optionally, at least a part of the extension section 123 can be clamped between the first terminal portion 31 and the second limiting portion 55.

[0226] A portion of the first tab 12 located between the second limiting portion 55 and the first terminal portion 31 may contact the second limiting portion 55, thereby being electrically connected to the second limiting portion 55. An overcurrent path may be formed between the first tab 12 and the conductive member 50, and part of the current may be directly transmitted between the first tab 12 and the conductive member 50, which is beneficial to improving the overcurrent capacity of the battery cell 6.

[0227] In some embodiments, referring to Figures 5 to 7 , the conductive member 50 includes a conductive body 53, a first limiting portion 54, and a second limiting portion 55. At least a part of the first limiting portion 54 is provided on a side of the wall portion 23 away from the electrode assembly 10, and at least a part of the second limiting portion 55 is provided on a side of the wall portion 23 facing the electrode assembly 10. A part of the conductive body 53 is received in the electrode lead-out hole 231 and is connected to the first limiting portion 54 and the second limiting portion 55.

[0228] At least a part of the first limiting portion 54 and at least a part of the second limiting portion 55 are respectively provided on two sides of the wall portion 23 along the thickness direction X, which can limit the conductive member 50 in the thickness direction X and reduce the risk of the conductive member 50 falling inside or outside the housing 20.

[0229] In some embodiments, referring to Figure 8 and Figure 9 , the conductive member 50 is provided on a side of the wall portion 23 facing away from the main body portion 11. The battery cell 6 includes a fixing member 71, and at least a part of the fixing member 71 is provided on a side of the conductive member 50 away from the wall portion 23 and is connected to the wall portion 23.

[0230] The fixing member 71 may be an annular structure. Exemplarily, the fixing member 71 is a rotating body.

[0231] In some examples, a part of the fixing member 71 may directly abut against the conductive member 50 along the thickness direction X. The wall portion 23 may be electrically connected to the conductive member 50 through the fixing member 71, so that the wall portion 23 is charged. In other examples, along the thickness direction X, an insulating member may also be provided between a part of the fixing member 71 and the conductive member 50. A part of the fixing member 71 may be press-fitted with the conductive member 50 indirectly through the insulating member, and the fixing member 71 may be insulated from the conductive member 50 through the insulating member.

[0232] In some examples, along the thickness direction X, a part of the fixing member 71 may be provided 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 part of the fixing member 71 may be provided on a side of at least a part of the second conductive portion 52 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.

[0233] Optionally, the fixing member 71 can be made of metal to improve the connection strength and stability between the fixing member 71 and the wall portion 23.

[0234] The fixing member 71 and the wall portion 23 can be connected and relatively fixed by welding or other suitable means.

[0235] The conductive member 50 is disposed on the side of the wall portion 23 away from the electrode assembly 10, which will not occupy the internal space of the housing 20, and can increase the size of the electrode assembly 10 within a limited space, thereby increasing the capacity of the battery cell 6.

[0236] Moreover, a part of the fixing member 71 is disposed on the side of the conductive member 50 away from the wall portion 23, and the fixing member 71 can apply a force towards the wall portion 23 to the conductive member 50, which is beneficial to pressing the conductive member 50 against the wall portion 23, realizing the assembly of the conductive member 50 and the wall portion 23, and also improving the sealing performance of the battery cell 6.

[0237] In some embodiments, referring to Figure 8 and Figure 9 , the battery cell 6 further includes a second insulating member 72, and the second insulating member 72 at least partially surrounds the conductive member 50 and is fixed relative to the conductive member 50. A part of the fixing member 71 can be embedded inside the second insulating member 72, and the other part is connected to the wall portion 23.

[0238] The second insulating member 72 can be made of a heat-resistant insulating material. Optionally, the second insulating member 72 can be a plastic part. The second insulating member 72 can be disposed on the outer periphery of the conductive member 50 by an integral injection molding method.

[0239] The second insulating member 72 can enhance the installation stability of the fixing member 71, and also reduce the possibility of the fixing member 71 overlapping with the conductive member 50 or the bus bar member, thereby reducing the short-circuit risk.

[0240] In some embodiments, referring to Figure 3 , Figure 4 and Figure 15 , the electrode assembly 10 further includes a second tab 13 extending from the main body portion 11, and the second tab 13 has a polarity opposite to that of the first 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 portion 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 tab 13 and the third terminal portion 81, and at least a part of the fourth terminal portion 82 is disposed on the side of the third terminal portion 81 away from the main body portion 11, and the base metal of the fourth terminal portion 82 is the same as the base metal of the bus bar member 40.

[0241] Optionally, the first tab 12 can be a positive tab, and the second tab 13 can be a negative tab. The first electrode terminal 30 can be an integrally formed structure with a single base metal, and the base metal of the first electrode terminal 30 can be the same as the material of the first tab 12.

[0242] The third terminal portion 81 and the fourth terminal portion 82 can be connected by at least one of cold rolling, hot rolling, explosive cladding method, and explosive rolling method. Thereby, it is beneficial to improve the connection strength and stability between the third terminal portion 81 and the fourth terminal portion 82, and reduce the risk of the connection surfaces of the third terminal portion 81 and the fourth terminal portion 82 separating from each other.

[0243] The adapter 90 can be connected to the second 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 tab 13, and between the adapter 90 and the third terminal portion 81.

[0244] 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 beneficial to improve the connection strength and connection stability between the two.

[0245] The main metal component of the fourth terminal portion 82 is the same as the main metal component of the bus bar component 40 of one battery cell 6, so that the bus bar component 40 of one battery cell 6 can be welded to the fourth terminal portion 82 of another battery cell 6, thereby simply realizing the series connection of two battery cells 6.

[0246] The fourth terminal portion 82 can be stacked with the third terminal portion 81 in the thickness direction X. The fourth terminal portion 82 can be entirely disposed on the outer side of the wall portion 23 facing away from the main body portion 11, which is beneficial to reduce the space occupied by the second electrode terminal 80 in the housing 20, improve the space utilization rate, and also facilitate the connection with the bus bar component 40 of another battery cell 6.

[0247] In the embodiment of the present application, the second electrode terminal 80 is provided to include a third terminal portion 81 and a fourth terminal portion 82 with different base metals, which facilitates the third terminal portion 81 and the fourth terminal portion 82 to be respectively connected to the adapter 90 and the bus bar component 40 of another battery cell 6, and is beneficial to reduce the connection difficulty and improve the connection reliability.

[0248] 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 the side of the second electrode terminal 80 away from the main body portion 11.

[0249] During welding, the third terminal portion 81 and the adapter 90 can be heated by laser or other means, so that the adjacent portions of the third terminal portion 81 and the adapter 90 are melted and fused together, and the fused portion forms the second welding portion W2 after solidification.

[0250] In some examples, along the thickness direction X, at least part of the third terminal portion 81 and the adapter 90 are stacked, and the adapter 90 and the third terminal portion 81 are penetration-welded by laser or other means. In other examples, through holes can also be formed in the third terminal portion 81, and at least part of the adapter 90 is received in the through holes of the third terminal portion 81 and butt-welded to the adapter 90.

[0251] The fact that the second welding portion W2 is exposed on the side of the second electrode terminal 80 away from the main body portion 11 means that a part of the second welding portion W2 can be exposed and revealed 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 facing away from the main body portion 11, and the welding surface of the third terminal portion 81 is exposed and revealed from the outside of the second electrode terminal 80 so as to directly receive welding heat (such as receiving irradiated laser). During 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 on the outside of the second electrode terminal 80. Thus, the possibility of welding particles generated during welding falling into the side of the adapter 90 facing the main body portion 11 can be reduced, the risk of internal short circuit of the battery cell 6 can be lowered, and the reliability of the battery cell 6 can be improved.

[0252] 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.

[0253] The second tab 13 is a negative tab, and the material of the negative tab is copper. In the embodiments of the present application, the base metal of the adapter 90 is set as copper, which is convenient for welding between the adapter 90 and the second tab 13. In the embodiments of the present application, the base metal of the third terminal portion 81 is set as copper, which is convenient for welding between the third terminal portion 81 and the adapter 90.

[0254] The fourth terminal portion 82 is used to connect the bus bar component 40 of another battery cell 6, and the bus bar component 40 is used to connect the positive electrode of another battery cell 6. The material of the positive electrode is usually aluminum. In the embodiments of the present application, the base metal of the fourth terminal portion 82 is set as aluminum, which is convenient for welding between the fourth terminal portion 82 and the bus bar component 40 of another battery cell 6.

[0255] In some embodiments, the housing 20 includes a housing body 21 and an end cap 22. The housing body 21 has an opening 211, and the end cap 22 is connected to the housing body 21 and covers the opening 211. The wall portion 23 is the end cap 22.

[0256] The end cap 22 can be connected to the housing 21 by welding, snap - fitting, bonding or other suitable means.

[0257] The housing 21 and the end cap 22 are of a split structure. During assembly, the whole formed by the electrode assembly 10 and the first electrode terminal 30 can be first installed into the housing 21 through the opening 211, then the end cap 22 is covered on the opening 211, and at least part of the first electrode terminal 30 is received in the electrode lead - out hole 231 of the end cap 22. Then, the first electrode terminal 30 and the bus bar component 40 are welded, which is beneficial to simplifying the assembly operation and reducing the assembly difficulty.

[0258] According to the second aspect of the present application, an embodiment of the present application further provides a battery device 2. Figure 16 It is a partial structural schematic diagram of the battery device provided by some embodiments of the present application. Referring to Figure 2 and Figure 16 , the battery device 2 includes a battery cell 6 provided according to any one of the embodiments of the first aspect of the present application.

[0259] In some embodiments, the electrode assembly 10 includes a second tab 13 led out from the main body portion 11, and the second tab 13 has a polarity opposite to that of the first tab 12. The battery cell 6 further includes a second electrode terminal 80 electrically connected to the second tab 13. The bus bar component 40 of one battery cell 6 is welded to the second electrode terminal 80 of another battery cell 6.

[0260] In some examples, the first tab 12 can be a positive tab, and the second tab 13 can be a negative tab. The first electrode terminal 30 can be an integrally formed structure with a single base metal, and the base metal of the first electrode terminal 30 is the same as the base metal of the bus bar component 40. The second electrode terminal 80 can include a third terminal portion 81 and a fourth terminal portion 82 that are connected to each other and have different base metals. The third terminal portion 81 is connected to the second tab 13, and the fourth terminal portion 82 is welded to the bus bar component 40 of one battery cell 6.

[0261] In other examples, the first tab 12 can be a negative tab, and the second tab 13 can be a positive tab. The first electrode terminal 30 includes a first terminal portion 31 and a second terminal portion 32 that are connected to each other and have different base metals. The first terminal portion 31 is connected to the first tab 12, and the second terminal portion 32 is connected to the bus bar component 40. The second electrode terminal 80 can be an integrally formed structure with a single base metal, and the base metal of the second electrode terminal 80 is the same as the base metal of the bus bar component 40.

[0262] According to the third aspect of the present application, an embodiment of the present application further provides an electrical device. The electrical device includes the battery device 2 provided according to any one of the embodiments of the second aspect of the present application, and the battery device 2 is used to provide electrical energy.

[0263] The battery cell 6 provided by an embodiment of the present application includes an electrode assembly 10, a housing 20, a first electrode terminal 30, a current collecting component 40, a conductive component 50, a first insulating member 60, a second electrode terminal 80, and an adapter 90. The housing 20 includes a housing body 21 and an end cover 22. The electrode assembly 10 is received in the housing 20. The electrode assembly 10 includes a main body portion 11, a first tab 12 and a second tab 13 extending from the main body portion 11. The first electrode terminal 30 is disposed on the end cover 22 and is directly connected to the first tab 12. The second electrode terminal 80 is disposed on the end cover 22 and is connected to the second tab 13 through the adapter 90. The current collecting component 40 is disposed on a side of the end cover 22 facing away from the main body portion 11. In a thickness direction X of the end cover 22, a part of the conductive component 50 is disposed between the current collecting component 40 and the end cover 22. The first insulating member 60 is at least partially disposed between the conductive component 50 and the end cover 22. The conductive component 50 is provided with a first through hole 56, and the current collecting component 40 is provided with a second through hole 41. A part of the first electrode terminal 30 passes through the first through hole 56 and the second through hole 41 and is butt-welded to the conductive component 50 and the current collecting component 40 to form a first welding portion W1. A part of the first welding portion W1 is exposed on a side of the current collecting component 40 away from the end cover 22 along the thickness direction X. The second electrode terminal 80 includes a third terminal portion 81 and a fourth terminal portion 82 disposed on a side of the third terminal portion 81 facing away from the main body portion 11. Along the thickness direction X, at least a part of the third terminal portion 81 and at least a part of the adapter 90 are stacked and welded to form a second welding portion W2. The second welding portion W2 is exposed on a side of the second electrode terminal 80 facing away from the main body portion 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 part of the first 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.

[0264] 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 foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be covered by the scope of the claims and the description of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling 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 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 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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