Battery cell, battery and electric device

Abstract

A battery cell, a battery, and an electric device. The battery cell comprises a housing, an electrode assembly, and electrode terminal. The housing is provided with a wall portion. The electrode assembly is accommodated within the housing. The electrode terminal is riveted on the wall portion, and the electrode terminal is electrically connected to the electrode assembly. The electrode terminal comprises a flanged portion; in the thickness direction of the wall portion, the flanged portion is formed at the end of the electrode terminal close to the electrode assembly and located on the side of the wall portion facing the electrode assembly; the end of the electrode terminal facing away from the electrode assembly forms a continuous connection surface, the connection surface being used for connecting to a bus component. The present battery cell is a structure that allows the electrode terminal to be riveted onto the wall portion from inside the housing, causing the bus component to be able to directly connect to the continuous connection surface at the end of the electrode terminal away from the electrode assembly, thus facilitating an increase in the connection area between the bus component and the electrode terminal, and thereby being able to improve the connection stability and reliability between the electrode terminal and the bus component.

Description

Battery cells, batteries and electrical devices Technical Field

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

[0002] In recent years, new energy vehicles have developed by leaps and bounds. In the field of electric vehicles, power batteries, as the power source of electric vehicles, play an irreplaceable and important role. With the vigorous promotion of new energy vehicles, the demand for power battery products is also growing. As the core components of new energy vehicles, batteries have high requirements in terms of safety in use and service life. The electrode assemblies of battery cells usually need to be interconnected with the electrode terminals provided on the outer casing through the collecting components, and then connected to the busbar components in the battery through the electrode terminals to realize the input or output of electrical energy of the battery cells. However, the connection stability between the electrode terminals and the busbar components of the battery cells in the existing batteries is poor, which makes it easy for the battery cells and the busbar components to fail, resulting in poor stability in use of the battery and a short service life.

[0003] Summary of the Invention

[0004] The embodiments of the present application provide a battery cell, a battery, and an electrical device, which can effectively improve the stability of battery operation.

[0005] In a first aspect, an embodiment of the present application provides a battery cell comprising a shell, an electrode assembly and an electrode terminal; the shell has a wall portion; the electrode assembly is accommodated in the shell; the electrode terminal is riveted to the wall portion, and the electrode terminal is electrically connected to the electrode assembly; wherein the electrode terminal comprises a flange portion, and along the thickness direction of the wall portion, the flange portion is formed at one end of the electrode terminal close to the electrode assembly and is located on a side of the wall portion facing the electrode assembly, so as to rivet the electrode terminal to the wall portion, and a continuously arranged connecting surface is formed at one end of the electrode terminal away from the electrode assembly, and the connecting surface is used to connect to the busbar component.

[0006] In the above technical solution, the flange portion of the electrode terminal is formed at one end of the electrode terminal close to the electrode assembly and located on the side of the wall facing the electrode assembly, and a connection surface for connecting to the busbar component is formed at one end of the electrode terminal away from the electrode assembly, so that the electrode terminal is a structure riveted to the wall from the inside of the shell, so that the end of the electrode terminal with the flange portion formed after being riveted to the wall is used to electrically connect to the electrode assembly, thereby eliminating the need to rivet and form a groove structure on the end of the electrode terminal used to connect to the busbar component, and eliminating the need to connect a cover plate for sealing the groove structure to the electrode terminal, so that the busbar component can be directly connected to the continuously arranged connection surface of the electrode terminal away from the electrode assembly, so as to reduce the interference effect of the weld mark formed by welding between the cover plate and the electrode terminal on the busbar component, and is conducive to increasing the connection area between the busbar component and the electrode terminal, thereby effectively improving the connection stability and connection reliability between the electrode terminal and the busbar component, so as to reduce the risk of connection failure between the electrode terminal of the battery cell and the busbar component during use, and is conducive to improving the use stability and service life of the battery having such a battery cell.

[0007] In some embodiments, the connecting surface is a plane.

[0008] In the above technical solution, the connection surface of the electrode terminal for connecting to the busbar is set to a planar structure, thereby facilitating the connection between the electrode terminal and the busbar, and facilitating improving the connection quality between the electrode terminal and the busbar.

[0009] In some embodiments, along a thickness direction of the wall portion, the wall portion has a first surface facing away from the electrode assembly, and the connecting surface is farther away from the electrode assembly than the first surface.

[0010] In the above technical solution, by setting the connection surface of the electrode terminal used to connect to the busbar component to be farther away from the electrode assembly than the first surface of the wall portion facing away from the electrode assembly, the electrode terminal is made to be a structure protruding from the first surface in the thickness direction of the wall portion. On the one hand, it is convenient to connect the busbar component with the connection surface of the electrode terminal, which is beneficial to reducing the difficulty of assembling the busbar component and the electrode terminal to each other. On the other hand, the size of the area corresponding to the connection surface of the electrode terminal can be made thicker to enhance the structural strength of the electrode terminal, which is beneficial to improve the connection strength and connection stability between the electrode terminal and the busbar component.

[0011] In some embodiments, a rivet groove is formed at one end of the electrode terminal facing the electrode assembly along the thickness direction of the wall portion, the flange portion is arranged around the rivet groove, and the projection of the rivet groove is located within the connecting surface.

[0012] In the above technical solution, a rivet groove is formed on one end of the electrode terminal facing the electrode assembly along the thickness direction of the wall portion, and the flange portion is a structure surrounding the outside of the rivet groove, so that riveting from one end of the electrode terminal facing the electrode assembly is facilitated to realize riveting the flange portion on the wall portion.

[0013] In some embodiments, along a thickness direction of the wall portion, the wall portion has a first surface facing away from the electrode assembly, and a bottom surface of the rivet groove is closer to the electrode assembly than the first surface.

[0014] In the above technical solution, by setting the bottom surface of the rivet groove to be closer to the electrode assembly than the first surface of the wall portion facing away from the electrode assembly, the thickness of the area between the bottom surface of the rivet groove and the connecting surface can be increased, which is beneficial to improving the structural strength of the electrode terminal, thereby improving the connection strength and connection stability between the electrode terminal and the busbar component.

[0015] In some embodiments, along a thickness direction of the wall portion, the wall portion has a second surface facing the electrode assembly, and a bottom surface of the rivet groove is closer to the electrode assembly than the second surface.

[0016] In the above technical solution, by setting the bottom surface of the rivet groove to be closer to the electrode assembly than the second surface of the wall facing the electrode assembly, the thickness of the area between the bottom surface of the rivet groove and the connecting surface can be further increased, which is beneficial to further improve the structural strength of the electrode terminal, thereby further improving the connection strength and connection stability between the electrode terminal and the busbar component.

[0017] In some embodiments, the battery cell further includes a current collecting member disposed between the wall portion and the electrode assembly, the current collecting member connecting the electrode assembly and the electrode terminal to electrically connect the electrode assembly and the electrode terminal.

[0018] In the above technical solution, the battery cell is further provided with a current collecting component, which connects the electrode terminal and the electrode assembly through the current collecting component to achieve electrical connection between the electrode assembly and the electrode terminal, which is conducive to reducing the difficulty of connecting the electrode assembly and the electrode terminal.

[0019] In some embodiments, at least a portion of the current collecting member is accommodated in the rivet groove and connected to the bottom surface of the rivet groove.

[0020] In the above technical solution, by setting at least a portion of the current collecting component to be accommodated in the rivet groove and interconnected with the bottom surface of the rivet groove, the current collecting component is a structure that is at least partially inserted into the rivet groove. Therefore, the use of this structure can play a certain positioning role for the current collecting component, which is beneficial to improving the assembly accuracy between the current collecting component and the electrode terminal, and can reduce the difficulty of connecting the current collecting component and the electrode terminal.

[0021] In some embodiments, the wall portion is provided with a mounting hole, and the mounting hole passes through the wall portion along the thickness direction of the wall portion; the battery cell also includes a sealant, which is provided between the wall portion and the electrode terminal, and at least a portion of the sealant is located in the mounting hole to seal the gap between the electrode terminal and the hole wall of the mounting hole, and along the thickness direction of the wall portion, the sealant abuts against the side of the flange portion away from the electrode assembly; wherein, the current collecting component is welded to the bottom surface of the rivet groove.

[0022] In the above technical solution, the current collecting component is provided as a structure welded to the bottom surface of the rivet groove to improve the connection strength and connection stability between the current collecting component and the electrode terminal, and the structure in which at least a portion of the current collecting component is inserted into the rivet groove and welded to the bottom surface of the rivet groove can make the area where the current collecting component and the electrode terminal are welded to each other away from the seal, thereby effectively reducing the impact of the welding of the current collecting component and the electrode terminal on the seal, which is conducive to alleviating the phenomenon of the seal being burned, and further effectively improving the sealing effect of the seal on the electrode terminal and the hole wall of the mounting hole.

[0023] In some embodiments, the current collecting component includes a base and a first protrusion; the base is arranged between the electrode assembly and the wall along the thickness direction of the wall, and the base is connected to the electrode assembly; the first protrusion is protruding from the side of the base away from the electrode assembly, and the first protrusion is inserted into the rivet groove and connected to the bottom surface of the rivet groove.

[0024] In the above technical solution, the current collecting component is provided with a base and a first protrusion protruding from the side of the base away from the electrode assembly, and the first protrusion is inserted into the rivet groove and connected to the bottom surface of the rivet groove, so as to realize that at least part of the current collecting component is accommodated in the rivet groove and assembled with the electrode terminal. On the one hand, the current collecting component adopting this structure facilitates the connection between the current collecting component and the electrode terminal, which is beneficial to reducing the difficulty of assembly between the current collecting component and the electrode terminal. On the other hand, the structure in which the first protrusion is inserted into the first groove can play a certain guiding and limiting role in the process of mutual assembly of the current collecting component and the electrode terminal, which is beneficial to improving the assembly efficiency and assembly quality between the current collecting component and the electrode terminal.

[0025] In some embodiments, along the thickness direction of the wall portion, the flange portion has a third surface facing the electrode assembly, the rivet groove is recessed from the third surface in a direction away from the electrode assembly, and the third surface abuts the base.

[0026] In the above technical solution, the rivet groove of the electrode terminal is arranged on the third surface of the flange portion facing the electrode assembly, and the third surface is in contact with the base of the current collecting component in the thickness direction of the wall portion, so that the first protrusion of the current collecting component is conveniently inserted into the rivet groove, and it is beneficial to further increase the contact area between the current collecting component and the electrode terminal, so as to improve the flow effect between the current collecting component and the electrode terminal.

[0027] In some embodiments, along a thickness direction of the wall portion, a first groove is formed on a side of the current collecting member facing the electrode assembly and corresponding to a position of the first protrusion.

[0028] In the above technical solution, a first groove is formed in an area corresponding to the first convex portion on a side of the current collecting component facing the electrode assembly, so that the current collecting component is a structure that can be formed by stamping, so that the first convex portion and the first groove are respectively formed on both sides of the current collecting component, which is conducive to reducing the manufacturing difficulty of the current collecting component.

[0029] In some embodiments, a connecting portion is protruded from the bottom surface of the rivet groove, and the connecting portion is connected to the current collecting component.

[0030] In the above technical solution, by protruding a connecting portion on the bottom surface of the rivet groove, the current collecting component is connected to the connecting portion to achieve electrical connection between the current collecting component and the electrode terminal. The current collecting component adopting this structure is simple in structure and easy to assemble, and there is no need to provide a protruding structure inserted into the rivet groove on the current collecting component, which is conducive to reducing the processing difficulty of the current collecting component.

[0031] In some embodiments, the wall portion is provided with a mounting hole, and the mounting hole passes through the wall portion along the thickness direction of the wall portion; the battery cell also includes a sealant, which is provided between the wall portion and the electrode terminal, and at least a portion of the sealant is located in the mounting hole to seal the gap between the electrode terminal and the hole wall of the mounting hole, and along the thickness direction of the wall portion, the sealant abuts against the side of the flange portion away from the electrode assembly; wherein the current collecting component is welded to the connecting portion.

[0032] In the above technical solution, the current collecting component is provided as a structure welded to the connecting portion to improve the connection strength and connection stability between the current collecting component and the electrode terminal, and the structure in which the current collecting component and the connecting portion protruding from the bottom surface of the rivet groove are welded to each other can make the area where the current collecting component and the electrode terminal are welded to each other away from the sealing member, thereby effectively reducing the impact of the welding of the current collecting component and the electrode terminal on the sealing member, which is conducive to alleviating the phenomenon of the sealing member being burned out, and further effectively improving the sealing effect of the sealing member on the electrode terminal and the hole wall of the mounting hole.

[0033] In some embodiments, along the thickness direction of the wall portion, the flange portion has a third surface facing the electrode assembly, the rivet groove is recessed from the third surface toward away from the electrode assembly, and the end surface of the connecting portion facing one end of the electrode assembly is flush with the third surface.

[0034] In the above technical solution, by setting the end face of the connecting part facing the electrode assembly to be flush with the third surface of the flange portion provided with the rivet groove, the size of the connecting part in the thickness direction of the wall portion is equal to the groove depth of the rivet groove, thereby facilitating the setting of the side of the current collecting component facing the connecting part as a planar structure. On the one hand, it can reduce the processing difficulty of the current collecting component. On the other hand, while reducing the connection difficulty between the current collecting component and the connecting part, it can also achieve mutual abutment between the current collecting component and the third surface, which is beneficial to increase the flow area between the current collecting component and the electrode terminal.

[0035] In some embodiments, along the thickness direction of the wall portion, the flange portion has a third surface facing the electrode assembly, the rivet groove is recessed from the third surface toward a direction away from the electrode assembly, and the connecting portion protrudes from the third surface.

[0036] In the above technical solution, by setting the connecting part to protrude from the third surface of the flange part provided with the rivet groove in the thickness direction of the wall part, the end face of the connecting part facing the electrode assembly is closer to the electrode assembly than the third surface of the flange part provided with the rivet groove, thereby facilitating the mutual connection between the current collecting component and the connecting part, which is beneficial to reducing the phenomenon of poor connection quality between the current collecting component and the connecting part caused by the gap between the current collecting component and the connecting part.

[0037] In some embodiments, a second groove is provided on a side of the current collecting member facing away from the electrode assembly along the thickness direction of the wall portion; wherein the connecting portion is inserted into the second groove and connected to the bottom surface of the second groove.

[0038] In the above technical solution, a second groove is provided on the side of the current collecting component facing away from the electrode assembly, and the connecting portion is inserted into the second groove and connected to the bottom surface of the second groove. This structure can play a certain positioning role for the current collecting component, which is beneficial to improving the assembly accuracy between the current collecting component and the electrode terminal, and can reduce the difficulty of connecting the current collecting component and the electrode terminal.

[0039] In some embodiments, along a thickness direction of the wall portion, a second protrusion is formed on a side of the current collecting member facing the electrode assembly and corresponding to a position of the second groove.

[0040] In the above technical solution, a second convex portion is formed on the side of the current collecting component facing the electrode assembly and in the area corresponding to the second groove, so that the current collecting component is a structure that can be formed by stamping, so that the second groove and the second convex portion are respectively formed on both sides of the current collecting component, which is conducive to reducing the manufacturing difficulty of the current collecting component.

[0041] In some embodiments, along the thickness direction of the wall portion, the flange portion has a third surface facing the electrode assembly, the rivet groove is recessed from the third surface toward a direction away from the electrode assembly, and the third surface abuts the current collecting member.

[0042] In the above technical solution, by arranging the rivet groove of the electrode terminal on the third surface of the flange portion facing the electrode assembly, and the third surface abuts against the current collecting component in the thickness direction of the wall portion, it is beneficial to further increase the contact area between the current collecting component and the electrode terminal, so as to improve the flow effect between the current collecting component and the electrode terminal.

[0043] In some embodiments, the wall portion is provided with a mounting hole, and the mounting hole passes through the wall portion along the thickness direction of the wall portion; the electrode terminal also includes a main body portion and a limiting portion; the main body portion is provided in the mounting hole along the thickness direction of the wall portion, and the flange portion is connected to one end of the main body portion close to the electrode assembly; the limiting portion is connected to one end of the main body portion away from the electrode assembly, and along the thickness direction of the wall portion, the end of the limiting portion away from the electrode assembly forms the connecting surface, and the limiting portion is located on the side of the wall portion away from the electrode assembly, and the limiting portion and the flange portion are configured to cooperate to clamp the wall portion.

[0044] In the above technical solution, the electrode terminal is provided with a main body portion which is passed through the mounting hole, and the two ends of the main body portion in the thickness direction of the wall portion are respectively connected with a limiting portion and a flange portion, and the limiting portion and the flange portion are respectively located on the side of the wall portion away from the electrode assembly and the side facing the electrode assembly in the thickness direction of the wall portion, so that the flange portion of the electrode terminal can cooperate with the limiting portion to clamp the wall portion after riveting the flange, so as to realize that the electrode terminal is riveted and fixed to the wall portion from the inside of the shell, so that the side of the limiting portion away from the electrode assembly forms a connection surface for connecting to the busbar component, which is beneficial to increase the connection area between the busbar component and the electrode terminal, and thus can effectively improve the connection stability and connection reliability between the electrode terminal and the busbar component.

[0045] In some embodiments, the battery cell further includes a first insulating member; along a thickness direction of the wall portion, at least a portion of the first insulating member is located between the flange portion and the wall portion to insulate and isolate the flange portion and the wall portion.

[0046] In the above technical solution, the battery cell is also provided with a first insulating member, and at least part of the first insulating member is located between the flange portion and the wall portion, so that the first insulating member can play the role of insulating and isolating the flange portion and the wall portion, thereby reducing the risk of short circuit between the flange portion and the wall portion, which is beneficial to improving the reliability of the battery cell.

[0047] In some embodiments, the battery cell further includes a second insulating member; along a thickness direction of the wall portion, at least a portion of the second insulating member is located between the limiting portion and the wall portion to insulate and isolate the limiting portion and the wall portion.

[0048] In the above technical solution, the battery cell is also provided with a second insulating member, and at least part of the second insulating member is located between the limiting portion and the wall portion, so that the second insulating member can play the role of insulating and isolating the limiting portion and the wall portion, thereby reducing the risk of short circuit between the limiting portion and the wall portion, which is conducive to improving the reliability of the battery cell.

[0049] In some embodiments, a receiving groove is provided on the side of the wall portion facing away from the electrode assembly along the thickness direction of the wall portion, the mounting hole is provided on the bottom surface of the receiving groove, and at least a portion of the second insulating member is received in the receiving groove.

[0050] In the above technical solution, by providing a receiving groove for accommodating the second insulating part on the side of the wall portion facing away from the electrode assembly, it is convenient to assemble the second insulating part between the limiting portion and the wall portion, which can play a role in assembly positioning of the second insulating part, which is beneficial to reducing the difficulty of assembling the second insulating part, and can play a certain protective role for the second insulating part, so as to reduce the wear or damage of the second insulating part during use.

[0051] In some embodiments, the electrode terminal includes a first material layer and a second material layer that are composited with each other, and the first material layer and the second material layer are stacked along the thickness direction of the wall portion, the first material layer is located on the side of the second material layer facing the electrode assembly, and the second material layer forms the connecting surface on the side away from the first material layer; wherein, the material of the first material layer and the material of the second material layer are different, the first material layer is used to be connected to the electrode ear of the electrode assembly, and the material of the first material layer is the same as the material of the electrode ear of the electrode assembly, and the second material layer is used to be connected to the convergence component, and the material of the second material layer is the same as the material of the convergence component.

[0052] In the above technical solution, the electrode terminal is arranged to be composed of a first material layer and a second material layer which are stacked along the thickness direction of the wall and compositely connected to each other, and the material of the first material layer is the same as the material of the electrode ear of the electrode assembly, and the material of the second material layer is the same as the material of the busbar component, so that the electrode terminal can connect the busbar component and the electrode ear of different materials, so that the electrode terminal of this structure can realize the connection between the electrode ear of the electrode assembly and the busbar component of different materials, which is beneficial to improve the overcurrent effect and can alleviate the quality problems caused by the mutual assembly and connection between different materials.

[0053] In some embodiments, the housing includes a shell and an end cover; a receiving cavity with an opening is formed inside the shell, and the receiving cavity is used to receive the electrode assembly; the end cover closes the opening; wherein the end cover is the wall portion.

[0054] In the above technical solution, by setting the wall portion of the shell as the end cover for closing the opening of the shell, the battery cell adopting this structure is convenient for assembling the electrode terminal on the end cover, and is convenient for assembling and connecting the electrode terminal and the electrode assembly with each other, which is beneficial to reducing the difficulty of assembling the battery cell and improving the production efficiency of the battery cell.

[0055] In some embodiments, the outer shell includes a shell and an end cover; the shell includes an integrally formed side wall and the wall portion, the side wall is arranged around the wall portion, and along the thickness direction of the wall portion, one end of the side wall is connected to the wall portion, and the other end is enclosed to form an opening, and the side wall and the wall portion jointly define a accommodating cavity for accommodating the electrode assembly; the end cover closes the opening.

[0056] In the above technical solution, by setting the wall portion of the shell as a wall arranged opposite to the end cover in the thickness direction of the wall portion of the shell, the battery cell adopting this structure can make the area of ​​the shell where the electrode terminal is installed away from the end cover, and make there no direct connection relationship between the wall portion and the end cover, thereby alleviating the phenomenon that the force generated when the electrode terminal and other components pull or twist the wall portion acts on the end cover, thereby reducing the risk of connection failure between the end cover and the shell, and further helping to reduce the risk of leakage of the battery cell during use.

[0057] In a second aspect, an embodiment of the present application further provides a battery comprising the above-mentioned battery cell.

[0058] In a third aspect, an embodiment of the present application further provides an electrical device, comprising the above-mentioned battery cell, wherein the battery cell is used to provide electrical energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0060] FIG1 is a schematic structural diagram of a vehicle provided in some embodiments of the present application;

[0061] FIG2 is an exploded view of the structure of a battery provided in some embodiments of the present application;

[0062] FIG3 is a schematic structural diagram of a battery cell provided in some embodiments of the present application;

[0063] FIG4 is an exploded view of the structure of a battery cell provided in some embodiments of the present application;

[0064] FIG5 is a partial cross-sectional view of a battery cell provided in some embodiments of the present application;

[0065] FIG6 is a schematic diagram illustrating the connection between a busbar component and an electrode terminal and a current collecting member of a battery cell according to some embodiments of the present application;

[0066] FIG7 is a cross-sectional view of an electrode terminal of a battery cell provided in some embodiments of the present application;

[0067] FIG8 is a partial cross-sectional view of a battery cell provided in some other embodiments of the present application;

[0068] FIG9 is a cross-sectional view of an electrode terminal of a battery cell provided in some other embodiments of the present application;

[0069] FIG10 is a partial cross-sectional view of a battery cell provided in some other embodiments of the present application;

[0070] FIG11 is a cross-sectional view of an electrode terminal of a battery cell provided in some embodiments of the present application in other embodiments.

[0071] Icons: 1000 - vehicle; 100 - battery; 10 - housing; 11 - first housing body; 12 - second housing body; 20 - battery cell; 21 - housing; 211 - wall; 2111 - mounting hole; 2112 - first surface; 2113 - second surface; 2114 - receiving groove; 212 - housing; 2121 - opening; 213 - end cap; 22 - electrode assembly; 221 - tab; 23 - electrode terminal; 231 - flange; 2311 - third surface; 232 -connecting surface; 233-riveting groove; 2331-connecting part; 234-main body; 235-limiting part; 236-first material layer; 237-second material layer; 24-first insulating part; 25-second insulating part; 26-sealing part; 27-current collecting component; 271-base; 272-first protrusion; 273-first groove; 274-second groove; 275-second protrusion; 30-collecting component; 200-controller; 300-motor; X-thickness direction of the wall. DETAILED DESCRIPTION

[0072] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0073] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are for the purpose of describing specific embodiments only 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-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first" and "second" in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary-secondary relationship.

[0074] References to "embodiments" in this application mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments.

[0075] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," and "attached" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0076] The term "and / or" in this application simply describes an association between related objects, indicating that three possible relationships exist. 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 indicates that the related objects are in an "or" relationship.

[0077] In the embodiments of this application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components in different embodiments are omitted. It should be understood that the thickness, length, width, and other dimensions of the various components in the embodiments of this application, as well as the overall thickness, length, width, and other dimensions of the integrated device shown in the drawings are merely illustrative and should not constitute any limitation on this application.

[0078] The term "plurality" used in this application refers to two or more (including two).

[0079] In the embodiment of the present application, the battery cell may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0080] The battery cells can be lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-hydrogen batteries, nickel-cadmium batteries, lead-acid batteries, etc., which are not limited in the embodiments of the present application.

[0081] A battery cell typically includes an electrode assembly. This assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of a battery cell, active ions (such as lithium ions) are inserted and removed between the positive and negative electrodes. The separator, placed between the positive and negative electrodes, prevents short circuits between the positive and negative electrodes while allowing the active ions to pass through.

[0082] In some embodiments, the positive electrode may be a positive electrode sheet, which 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.

[0083] As an example, the positive electrode current collector has two surfaces facing each other in its thickness direction, and the positive electrode active material is provided on either or both of the two facing surfaces of the positive electrode current collector.

[0084] As an example, the positive electrode current collector may be a metal foil or a composite current collector. For example, as the metal foil, aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium, etc. may be used. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector may be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0085] As an example, the positive electrode active material may include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides and their respective modified compounds. However, the present application is not limited to these materials, and other traditional materials that can be used as positive electrode active materials for batteries may also be used. These positive electrode active materials may be used alone or in combination of two or more. Among them, examples of lithium-containing phosphates may include but are not limited to at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO4), a composite material of lithium manganese phosphate and carbon, lithium iron manganese phosphate, and a composite material of lithium iron manganese phosphate and carbon. Examples of lithium transition metal oxides may include but are not limited to lithium cobalt oxide (such as LiCoO2), lithium nickel oxide (such as LiNiO2), lithium manganese oxide (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide (such as LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 O2 (also referred to as NCM 333 ), LiNi 0.5 Co 0.2 Mn 0.3 O2 (also referred to as NCM 523 ), LiNi 0.5 Co 0.25 Mn 0.25 O2 (also referred to as NCM 211 ), LiNi 0.6 Co 0.2 Mn 0.2 O2 (also referred to as NCM622 ), LiNi 0.8 Co 0.1 Mn 0.1 O2 (also referred to as NCM 811 ), lithium nickel cobalt aluminum oxide (such as LiNi 0.85 Co 0.15 Al 0.05 O2) and at least one of its modified compounds, etc.

[0086] In some embodiments, a positive electrode may utilize a metal foam. The metal foam may include nickel foam, copper foam, aluminum foam, alloy foam, or the like. When a metal foam is used as the positive electrode, the surface of the metal foam may or may not include a positive electrode active material. For example, a lithium source material, potassium metal, or sodium metal may be filled or / and deposited within the metal foam, where the lithium source material is lithium metal and / or a lithium-rich material.

[0087] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0088] As an example, the negative electrode current collector may be a metal foil, a metal foam, or a composite current collector. For example, as the metal foil, aluminum or stainless steel treated with silver, stainless steel, copper, aluminum, nickel, carbon electrode, nickel, or titanium, etc. may be used. The metal foam may be nickel foam, copper foam, aluminum foam, alloy foam, etc. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector may be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0089] As an example, 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.

[0090] As an example, the negative electrode current collector has two surfaces facing each other in its thickness direction, and the negative electrode active material is provided on either or both of the two facing surfaces of the negative electrode current collector.

[0091] As an example, the negative electrode active material may adopt the negative electrode active material for battery cells that is well known in the art. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, lithium titanate, etc. The silicon-based material may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The tin-based material may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, the present application is not limited to these materials, and other traditional materials that can be used as negative electrode active materials for batteries may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0092] In some embodiments, the material of the positive electrode current collector may be aluminum, and the material of the negative electrode current collector may be copper.

[0093] In some embodiments, the electrode assembly further includes a separator disposed between the positive electrode and the negative electrode.

[0094] In some embodiments, the separator is a separator membrane. There are many types of separator membranes, and any known separator membrane with a porous structure having good chemical stability and mechanical stability can be selected.

[0095] As an example, the separator can be made of at least one of fiberglass, non-woven fabric, polyethylene, polypropylene, and polyvinylidene fluoride. The separator can be a single-layer film or a multi-layer composite film. In the case of a multi-layer composite film, the materials of each layer can be the same or different. The separator can be a separate component positioned between the positive and negative electrodes, or it can be attached to the surfaces of the positive and negative electrodes.

[0096] In some embodiments, the separator is a solid electrolyte, which is disposed between the positive electrode and the negative electrode and serves to transport ions and isolate the positive and negative electrodes.

[0097] In some embodiments, the battery cell further includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. The electrolyte can be liquid, gel, or solid. Liquid electrolytes include an electrolyte salt and a solvent.

[0098] In some embodiments, the electrolyte salt may include at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bisfluorosulfonyl imide, lithium bistrifluoromethanesulfonyl imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorooxalatoborate, lithium bisoxalatoborate, lithium difluorodioxalatophosphate, and lithium tetrafluorooxalatophosphate.

[0099] In some embodiments, the solvent may include at least one of ethylene carbonate, propylene carbonate, ethyl methyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methylpropyl carbonate, ethylpropyl carbonate, butylene carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, cyclopentane, dimethyl sulfone, methyl ethyl sulfone and diethyl sulfone. The solvent may also be an ether solvent. The ether solvent may include one or more of ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyltetrahydrofuran, diphenyl ether and crown ether.

[0100] Among them, the gel electrolyte includes a skeleton network with a polymer as the electrolyte, combined with an ionic liquid-lithium salt.

[0101] Among them, solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0102] As an example, the polymer solid electrolyte may be polyether (polyethylene oxide), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, a single ion polymer, polyionic liquid-lithium salt, cellulose, or the like.

[0103] As an example, the inorganic solid electrolyte may include an oxide solid electrolyte (crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous LiPON film), a sulfide solid electrolyte (crystalline lithium superion conductor (lithium germanium phosphosulfide, silver germanium sulfide), amorphous sulfide) and one or more of a halide solid electrolyte, a nitride solid electrolyte and a hydride solid electrolyte.

[0104] As an example, a composite solid electrolyte is formed by adding an inorganic solid electrolyte filler to a polymer solid electrolyte.

[0105] In some embodiments, the electrode assembly is a wound structure, wherein the positive electrode sheet and the negative electrode sheet are wound into the wound structure.

[0106] In some embodiments, the electrode assembly is a laminate structure.

[0107] As an example, multiple positive electrode sheets and multiple negative electrode sheets can be provided respectively, and the multiple positive electrode sheets and the multiple negative electrode sheets can be alternately stacked.

[0108] As an example, a plurality of positive electrode sheets may be provided, and the negative electrode sheet may be folded to form a plurality of stacked folded segments, with a positive electrode sheet being sandwiched between adjacent folded segments.

[0109] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form a plurality of stacked folded segments.

[0110] As an example, a plurality of separators may be provided, each of which is disposed between any adjacent positive electrode sheets or negative electrode sheets.

[0111] As an example, the separator may be provided continuously, and may be provided between any adjacent positive electrode sheets or negative electrode sheets by folding or winding.

[0112] In some embodiments, the shape of the electrode assembly can be cylindrical, flat, or polygonal.

[0113] In some embodiments, the electrode assembly is provided with tabs that can conduct current from the electrode assembly. The tabs include a positive tab and a negative tab.

[0114] In some embodiments, a battery cell may include a housing. The housing is used to encapsulate components such as the electrode assembly and the electrolyte. The housing may be a steel housing, an aluminum housing, a plastic housing (e.g., polypropylene), a composite metal housing (e.g., a copper-aluminum composite housing), or an aluminum-plastic film.

[0115] As an example, the battery cells may be cylindrical, prismatic, soft-pack or other shaped battery cells. Prismatic battery cells include but are not limited to square-shell, blade-shaped, and polygonal batteries, such as hexagonal batteries.

[0116] The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity.

[0117] In some embodiments, the battery may be a battery module. When there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0118] In some embodiments, the battery may be a battery pack, which includes a case and battery cells, wherein the battery cells or battery modules are housed in the case.

[0119] In some embodiments, the box body can be used as a part of the chassis structure of the vehicle. For example, part of the box body can become at least a part of the floor of the vehicle, or part of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0120] In some embodiments, the battery may be an energy storage device, including an energy storage container, an energy storage cabinet, and the like.

[0121] Batteries, with their outstanding advantages such as high energy density, low environmental pollution, high power density, long service life, wide adaptability, and low self-discharge coefficient, are a vital component of today's new energy development. The development of battery technology requires simultaneous consideration of multiple design factors, including performance parameters such as energy density, cycle life, discharge capacity, and charge / discharge rate. Furthermore, the battery's operational stability must also be considered.

[0122] For general battery cells, the outer shell of the battery cell usually includes a shell and an end cover, and the end cover is covered with the opening of the shell. In order to facilitate the assembly of the battery cell, the electrode terminal is usually riveted to the end cover of the battery cell, so that when the end cover is covered with the shell, the electrode terminal can be welded to the electrode lug of the electrode assembly through the current collecting member provided in the shell to achieve electrical connection between the electrode terminal and the electrode assembly, so as to realize the input or output of electrical energy of the battery cell through the electrode terminal as the output pole of the battery cell, and finally the end cover is connected to the shell.

[0123] Among them, a busbar component is usually provided in the battery, and the busbar component is connected to the electrode terminals of the battery cell to realize series connection, parallel connection or mixed connection between multiple battery cells. However, since the electrode terminal needs to be assembled on the end cover and the two ends of the electrode terminal need to extend out of the two sides of the end cover, the thickness of the electrode terminal is relatively thick, which greatly increases the difficulty of welding between the electrode terminal and the current collecting component and the busbar component, which is not conducive to improving the production efficiency of the battery. In order to solve the problem of the difficulty in welding between the electrode terminal and the current collecting component and the busbar component, in the relevant technology, the electrode terminal is usually set to a split structure, including a terminal body and a cover plate. A rivet groove is formed at the end of the terminal body away from the current collecting component to reduce the thickness of the electrode terminal, and the end of the terminal body provided with the rivet groove is riveted to the end cover, thereby reducing the difficulty of welding between the electrode terminal and the current collecting component. The connection relationship between the electrode terminal and the current collecting component is achieved by welding the terminal body to the current collecting component. Then, the cover plate is welded on the side of the terminal body away from the current collecting component, so that the cover plate is covered on the rivet groove and the cover plate and the terminal body are welded to each other, so that the end of the electrode terminal away from the current collecting component is welded to the busbar component in the battery. However, in a battery cell of this structure, the weld mark formed by welding the cover plate and the terminal body to each other will occupy a large space on the end of the electrode terminal away from the current collecting component, reducing the connection area between the electrode terminal and the current collecting component, and the assembly space is limited, resulting in poor connection stability between the electrode terminal of the battery cell in the battery and the current collecting component. Since the battery is shaken or moved during use, it is easy to cause connection failure between the battery cell in the battery and the current collecting component, resulting in poor battery stability and a short service life.

[0124] Based on the above considerations, in order to solve the problems of poor stability and short service life of the battery, an embodiment of the present application provides a battery cell, which includes a shell, an electrode assembly and an electrode terminal. The shell has a wall portion. The electrode assembly is accommodated in the shell. The electrode terminal is riveted to the wall portion, and the electrode terminal is electrically connected to the electrode assembly. The electrode terminal includes a flange portion, which is formed along the thickness direction of the wall portion at one end of the electrode terminal close to the electrode assembly and is located on the side of the wall portion facing the electrode assembly, so as to rivet the electrode terminal to the wall portion, and form a continuously arranged connection surface at one end of the electrode terminal away from the electrode assembly, and the connection surface is used to connect to the busbar component.

[0125] In a battery cell of this structure, the flange portion of the electrode terminal is formed at one end of the electrode terminal close to the electrode assembly and located on the side of the wall facing the electrode assembly, and a connection surface for connecting to the busbar component is formed at one end of the electrode terminal away from the electrode assembly, so that the electrode terminal is a structure riveted to the wall from the inside of the shell, so that the end of the electrode terminal with the flange portion formed after being riveted to the wall is used to electrically connect to the electrode assembly, thereby eliminating the need to rivet and form a groove structure on the end of the electrode terminal used to connect to the busbar component, and eliminating the need to connect a cover plate for sealing the groove structure to the electrode terminal, so that the busbar component can be directly connected to the continuously arranged connection surface of the electrode terminal away from the electrode assembly, thereby reducing the interference effect of the weld mark formed by welding between the cover plate and the electrode terminal on the busbar component, and facilitating an increase in the connection area between the busbar component and the electrode terminal, thereby effectively improving the connection stability and reliability between the electrode terminal and the busbar component, thereby reducing the risk of connection failure between the electrode terminal and the busbar component of the battery cell during use, and facilitating an improvement in the use stability and service life of the battery having such a battery cell.

[0126] The battery cells disclosed in the embodiments of this application can be used, but are not limited to, in electrical devices such as vehicles, ships, or aircraft. A power supply system comprising the battery cells and batteries disclosed in this application can be used to construct such electrical devices. This helps alleviate the problem of connection failure between the battery cells and the current busbar during use, thereby improving the battery's stability and service life.

[0127] The present invention provides an electric device that uses a battery as a power source. The electric device may be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery-powered vehicle, an electric car, a ship, a spacecraft, etc. The electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc. The spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0128] For the convenience of description, the following embodiments are described by taking a vehicle as an example of an electrical device according to an embodiment of the present application.

[0129] Please refer to Figure 1, which is a structural schematic diagram of a vehicle 1000 provided in some embodiments of the present application. The vehicle 1000 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 100 is provided inside the vehicle 1000. The battery 100 can be arranged at the bottom of the vehicle 1000, or at the head of the vehicle 1000, or at the tail of the vehicle 1000. The battery 100 can be used to power the vehicle 1000. For example, the battery 100 can be used as an operating power source or a power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to power the motor 300, for example, for starting, navigating and driving the vehicle 1000.

[0130] In some embodiments of the present application, the battery 100 can not only serve as the operating power source or usage power source of the vehicle 1000, but also serve as the driving power source of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0131] 2 and 3 , FIG2 is an exploded view of a battery 100 according to some embodiments of the present invention, and FIG3 is a schematic diagram of a battery cell 20 according to some embodiments of the present invention. The battery 100 includes a housing 10 and a battery cell 20 , wherein the battery cell 20 is accommodated in the housing 10 .

[0132] The housing 10 is used to provide assembly space for the battery cells 20 and can adopt a variety of structures. In some embodiments, the housing 10 can include a first housing body 11 and a second housing body 12. The first housing body 11 and the second housing body 12 cover each other, and the first housing body 11 and the second housing body 12 jointly define an assembly space for accommodating the battery cells 20. The second housing body 12 can be a hollow structure with one end open, and the first housing body 11 can be a plate-like structure. The first housing body 11 covers the open side of the second housing body 12, so that the first housing body 11 and the second housing body 12 jointly define the assembly space. The first housing body 11 and the second housing body 12 can also be hollow structures with one end open, and the open side of the first housing body 11 covers the open side of the second housing body 12.

[0133] Of course, the box body 10 formed by the first box body 11 and the second box body 12 can be in various shapes, such as a cylinder, a cuboid or a cube, etc. For example, in FIG2 , the box body 10 is in the shape of a cuboid.

[0134] In the battery 100, there can be one or more battery cells 20 disposed within the housing 10. When there are multiple battery cells 20 disposed within the housing 10, the multiple battery cells 20 can be connected in series, in parallel, or in a hybrid configuration. A hybrid configuration refers to a combination of series and parallel configurations within the multiple battery cells 20. The multiple battery cells 20 can be directly connected in series, in parallel, or in a hybrid configuration, and then the entire structure formed by the multiple battery cells 20 is housed within the housing 10. Alternatively, the battery 100 can be constructed by first connecting multiple battery cells 20 in series, in parallel, or in a hybrid configuration to form a battery module, which is then further connected in series, in parallel, or in a hybrid configuration to form a single structure, which is then housed within the housing 10.

[0135] In some embodiments, the battery 100 may further include other structures. For example, the battery 100 may further include a busbar component 30 (not shown in the figure). The busbar component 30 is used to connect the multiple battery cells 20 to achieve electrical connection between the multiple battery cells 20.

[0136] Each battery cell 20 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 20 can be a rectangular parallelepiped, a cylinder, a prism, or other shapes. For example, in FIG3 , the battery cell 20 is a rectangular parallelepiped.

[0137] According to some embodiments of the present application, with reference to FIG3 , and further with reference to FIG4 , FIG5 , FIG6 and FIG7 , FIG4 is an exploded view of the structure of a battery cell 20 provided in some embodiments of the present application, FIG5 is a partial cross-sectional view of a battery cell 20 provided in some embodiments of the present application, FIG6 is a schematic diagram of the connection between the current collecting component 30 and the electrode terminal 23 and the current collecting member 27 of the battery cell 20 provided in some embodiments of the present application, and FIG7 is a cross-sectional view of the electrode terminal 23 of the battery cell 20 provided in some embodiments of the present application. The present application provides a battery cell 20, which includes a housing 21, an electrode assembly 22 and an electrode terminal 23. The housing 21 has a wall portion 211. The electrode assembly 22 is accommodated in the housing 21. The electrode terminal 23 is riveted to the wall portion 211, and the electrode terminal 23 is electrically connected to the electrode assembly 22. The electrode terminal 23 includes a flange portion 231. Along the thickness direction X of the wall, the flange portion 231 is formed at one end of the electrode terminal 23 close to the electrode assembly 22 and is located on the side of the wall 211 facing the electrode assembly 22, so as to rivet the electrode terminal 23 to the wall 211. A continuously arranged connecting surface 232 is formed at the end of the electrode terminal 23 facing away from the electrode assembly 22, and the connecting surface 232 is used to connect to the busbar component 30.

[0138] The housing 21 can also be used to accommodate an electrolyte, such as an electrolyte solution. The housing 21 can have various structural forms. The housing 21 can also be made of various materials, such as copper, iron, aluminum, steel, and aluminum alloys.

[0139] In some embodiments, the housing 21 may include a shell 212 and an end cover 213, wherein a accommodating cavity is formed inside the shell 212, and the accommodating cavity has an opening 2121, that is, the shell 212 is a hollow structure with one end open, and the end cover 213 covers the opening 2121 of the shell 212 and forms a sealed connection to form a sealed space for accommodating the electrode assembly 22 and the electrolyte.

[0140] Optionally, the wall portion 211 for mounting the electrode terminal 23 may be the end cap 213, or may be one of the multiple walls of the housing 212. For example, in Figures 3 and 4, the wall portion 211 is the end cap 213 of the housing 21. Of course, in other embodiments, the wall portion 211 may also be the bottom wall of the housing 212 disposed opposite the end cap 213 in the thickness direction X of the wall portion, or a side wall adjacent to and abutting the end cap 213.

[0141] When assembling the battery cell 20 , the electrode assembly 22 may be placed in the housing 212 , and the housing 212 may be filled with electrolyte. The end cap 213 may then be placed on the opening 2121 of the housing 212 to seal the opening 2121 of the housing 212 .

[0142] The housing 212 can have a variety of shapes, such as a cylinder or a rectangular parallelepiped. The shape of the housing 212 can be determined based on the specific shape of the electrode assembly 22. For example, if the electrode assembly 22 has a cylindrical structure, the housing 212 can have a cylindrical structure; if the electrode assembly 22 has a rectangular parallelepiped structure, the housing 212 can have a rectangular parallelepiped structure. Of course, the end cap 213 can also have a variety of structures, such as a plate-like structure or a hollow structure with one end open. For example, in Figure 4, the housing 212 has a rectangular parallelepiped structure.

[0143] It is understandable that the shell 21 is not limited to the above structure. The shell 21 can also be other structures. For example, the shell 21 includes a shell 212 and two end covers 213. The shell 212 is a hollow structure with openings 2121 on opposite sides. One end cover 213 corresponds to an opening 2121 of the shell 212 and forms a sealed connection to form a sealed space for accommodating the electrode assembly 22 and the electrolyte.

[0144] The electrode assembly 22 is a component in the battery cell 20 where electrochemical reactions occur. The structure of the electrode assembly 22 can be various. For example, the electrode assembly 22 can be a wound structure formed by winding the positive electrode sheet, the separator and the negative electrode sheet, or it can be a stacked structure formed by stacking the positive electrode sheet, the separator and the negative electrode sheet.

[0145] Exemplarily, the separator is an isolation membrane, and the main material of the isolation membrane can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene and polyvinylidene fluoride.

[0146] The electrode assembly 22 has a tab 221 formed at one end near the wall 211 in the thickness direction X of the wall. The tab 221 is used to input or output the positive or negative electrode of the electrode assembly 22. The tab 221 is used to connect to the electrode terminal 23 to achieve electrical connection between the electrode assembly 22 and the electrode terminal 23. It should be noted that the tab 221 of the electrode assembly 22 is formed by the stacked connection of the regions of the positive electrode sheet not coated with the positive electrode active material layer, or the stacked connection of the regions of the negative electrode sheet not coated with the negative electrode active material layer. If the tab 221 is used to output the positive electrode of the electrode assembly 22, the tab 221 is formed by the stacked connection of the regions of the positive electrode sheet not coated with the positive electrode active material layer; if the tab 221 is used to output the negative electrode of the electrode assembly 22, the tab 221 is formed by the stacked connection of the regions of the negative electrode sheet not coated with the negative electrode active material layer.

[0147] For example, the material of the tab 221 may be copper or aluminum.

[0148] Optionally, the number of electrode assemblies 22 housed in the housing 21 may be one or more. For example, in FIG4 , the housing 21 of the battery cell 20 is provided with two electrode assemblies 22 , which are stacked along the thickness direction thereof. In other words, the two electrode assemblies 22 are stacked along the thickness direction of the battery cell 20. Of course, in other embodiments, the number of electrode assemblies 22 housed in the housing 21 may be one, three, four, five, six, seven, or eight, etc.

[0149] The electrode terminal 23 serves to output or input electrical energy of the battery cell 20 . One end of the electrode terminal 23 is used to connect to the tab 221 of the electrode assembly 22 , and the other end is used to connect to the busbar component 30 to realize the input or output of electrical energy of the battery cell 20 .

[0150] For example, the electrode terminal 23 can be made of a variety of materials, for example, copper, iron, aluminum, steel, aluminum alloy, etc. Of course, in some embodiments, the electrode terminal 23 can also be made of a composite material, that is, the electrode terminal 23 is formed by connecting two metals of different materials together, for example, by hot pressing or cold pressing.

[0151] For example, the materials of the busbar component 30 may be various, such as copper, iron, aluminum, steel, aluminum alloy, etc.

[0152] The electrode terminal 23 is riveted to the wall portion 211, that is, the electrode terminal 23 is assembled on the wall portion 211 by a riveting process. As shown in Figures 4 and 5, a mounting hole 2111 is provided on the wall portion 211. The mounting hole 2111 passes through both sides of the wall portion 211 along the thickness direction X of the wall portion. Part of the electrode terminal 23 is passed through the mounting hole 2111 to rivet the electrode terminal 23 to the wall portion 211, and the mounting holes 2111 are extended from both ends of the electrode terminal 23 respectively, so that the electrode terminal 23 can connect the electrode assembly 22 located in the outer shell 21 and the busbar component 30 located outside the outer shell 21 to realize the input or output of electrical energy of the battery cell 20.

[0153] The electrode terminal 23 is insulated and mounted on the wall portion 211, i.e., no electrical connection is formed between the electrode terminal 23 and the wall portion 211. In some embodiments, as shown in Figures 4 and 5, the battery cell 20 may further include a first insulating member 24 and a second insulating member 25. The first insulating member 24 is located on the side of the wall portion 211 facing the electrode assembly 22, and at least a portion of the first insulating member 24 is located between the wall portion 211 and the electrode terminal 23 to insulate and separate the wall portion 211 and the electrode terminal 23. The second insulating member 25 is located on the side of the wall portion 211 facing away from the electrode assembly 22, and at least a portion of the second insulating member 25 is located between the wall portion 211 and the electrode terminal 23 to insulate and separate the wall portion 211 and the electrode terminal 23.

[0154] Optionally, the first insulating member 24 and the second insulating member 25 may be made of various materials. For example, the first insulating member 24 and the second insulating member 25 may be made of rubber, silicone, plastic, or the like.

[0155] In some embodiments, the battery cell 20 may further include a seal 26, which is disposed between the wall portion 211 and the electrode terminal 23, and at least a portion of the seal 26 is located within the mounting hole 2111, and the seal 26 is configured to seal the gap between the electrode terminal 23 and the wall surface of the mounting hole 2111.

[0156] For example, the sealing member 26 may be made of rubber, silicone, plastic, or the like.

[0157] The electrode terminal 23 has a flange portion 231 , which is a structure formed by flanging when the electrode terminal 23 is riveted. That is, a portion of the electrode terminal 23 is riveted and flanging, and the flanging portion is the flange portion 231 .

[0158] The flange portion 231 is formed at one end of the electrode terminal 23 close to the electrode assembly 22 and is located on the side of the wall portion 211 facing the electrode assembly 22. In other words, the electrode terminal 23 is a structure that is riveted and flanged from the inner side of the shell 21, so that the flange portion 231 is formed at one end of the electrode terminal 23 close to the electrode assembly 22, so that the flange portion 231 can abut against the side of the wall portion 211 facing the electrode assembly 22, thereby achieving the electrode terminal 23 being riveted to the wall portion 211. It should be noted that the flange portion 231 can directly abut against the wall portion 211 or indirectly abut against the wall portion 211. For example, in Figure 5, the flange portion 231 is indirectly abutted against the wall portion 211 through the first insulating member 24, that is, the first insulating member 24 is disposed between the flange portion 231 and the wall portion 211, so that the flange portion 231 and the wall portion 211 can be insulated and isolated by the first insulating member 24.

[0159] A continuously arranged connecting surface 232 is formed at one end of the electrode terminal 23 away from the electrode assembly 22. The connecting surface 232 is used to connect to the busbar component 30. That is, the end surface of the electrode terminal 23 away from the electrode assembly 22 is a complete continuous surface without structures such as grooves or protrusions. This end surface is the connecting surface 232, and this end surface is used to connect to the busbar component 30 of the battery 100 to realize the input or output of electrical energy of the battery cell 20.

[0160] In some embodiments, in Figures 4 and 5, the battery cell 20 may further include a current collecting member 27, which is disposed in the housing 21 and connects the electrode terminal 23 and the tab 221 of the electrode assembly 22 to achieve electrical connection between the electrode assembly 22 and the electrode terminal 23.

[0161] Exemplarily, the current collecting member 27 is welded to the electrode terminal 23 and welded to the tab 221. Of course, in other embodiments, the current collecting member 27 may also be in contact with or bonded to the electrode terminal 23, and similarly, the current collecting member 27 may also be in contact with or bonded to the tab 221.

[0162] In Figure 4, the battery cell 20 includes two electrode terminals 23 and two current collecting members 27. Correspondingly, each electrode assembly 22 has two pole tabs 221, and the polarities of the two pole tabs 221 are opposite. The two electrode terminals 23 are electrically connected to the two pole tabs 221 of the electrode assembly 22 through the two current collecting members 27 to realize the input or output of the positive and negative electrodes of the battery cell 20.

[0163] Optionally, both electrode terminals 23 are mounted on the wall portion 211, and each electrode terminal 23 is electrically connected to a tab 221 of the electrode assembly 22 to output the positive and negative electrodes of the battery cell 20. Of course, in other embodiments, the two electrode terminals 23 can also be mounted on different walls of the housing 21.

[0164] In some embodiments, the battery cell 20 may further include a pressure relief mechanism disposed on the housing 21 , and configured to release the pressure inside the battery cell 20 when the internal pressure or temperature of the battery cell 20 reaches a predetermined value.

[0165] Optionally, the pressure relief mechanism may be provided on the end cover 213 of the housing 21, or may be provided on the shell 212 of the housing 21. Similarly, the pressure relief mechanism and the housing 21 may be an integrally formed structure, or may be a separate structure. If the pressure relief mechanism and the housing 21 are a separate structure, the pressure relief mechanism may be connected to the housing 21 by welding or the like. Correspondingly, the pressure relief mechanism may be a pressure relief component such as an explosion-proof valve, an explosion-proof disk, an air valve, a pressure relief valve, or a safety valve. If the pressure relief mechanism and the housing 21 are an integrally formed structure, the pressure relief mechanism is an area on the housing 21 where a weak structure is formed, for example, an area on the housing 21 where a notch groove is provided.

[0166] By forming the flange portion 231 of the electrode terminal 23 at one end of the electrode terminal 23 close to the electrode assembly 22 and located on the side of the wall portion 211 facing the electrode assembly 22, and forming a connection surface 232 for connecting to the busbar component 30 at one end of the electrode terminal 23 away from the electrode assembly 22, the electrode terminal 23 is riveted to the wall portion 211 from the inside of the shell 21, so that the end of the electrode terminal 23 with the flange portion 231 formed after being riveted to the wall portion 211 is used for electrical connection with the electrode assembly 22, thereby eliminating the need to rivet and form a groove structure on the end of the electrode terminal 23 for connecting to the busbar component 30, and eliminating the need to connect a sealing member on the electrode terminal 23. The groove structure of the cover plate enables the busbar component 30 to be directly connected to the continuously arranged connection surface 232 at the end of the electrode terminal 23 facing away from the electrode assembly 22, so as to reduce the interference effect of the weld mark formed by the welding between the cover plate and the electrode terminal 23 on the busbar component 30, and is conducive to increasing the connection area between the busbar component 30 and the electrode terminal 23, thereby effectively improving the connection stability and connection reliability between the electrode terminal 23 and the busbar component 30, so as to reduce the risk of connection failure between the electrode terminal 23 of the battery cell 20 and the busbar component 30 during use, which is conducive to improving the use stability and service life of the battery 100 having such a battery cell 20.

[0167] According to some embodiments of the present application, referring to FIG. 5 , FIG. 6 and FIG. 7 , the connection surface 232 is a plane.

[0168] The connecting surface 232 is a continuously arranged plane, that is, the connecting surface 232 is a complete and continuously arranged plane, and no protrusion or groove structure is arranged on the connecting surface 232 .

[0169] Exemplarily, the connecting surface 232 and the thickness direction X of the wall portion are perpendicular to each other.

[0170] By setting the connection surface 232 of the electrode terminal 23 for connecting to the busbar component 30 as a planar structure, the electrode terminal 23 and the busbar component 30 are easily connected to each other, and the connection quality between the electrode terminal 23 and the busbar component 30 is improved.

[0171] According to some embodiments of the present application, as shown in FIG. 5 , along the thickness direction X of the wall portion, the wall portion 211 has a first surface 2112 facing away from the electrode assembly 22 , and the connecting surface 232 is further away from the electrode assembly 22 than the first surface 2112 .

[0172] The first surface 2112 is the surface of the wall portion 211 facing away from the electrode assembly 22 , that is, the first surface 2112 is the outer surface of the wall portion 211 facing away from the interior of the shell 21 .

[0173] The connecting surface 232 is farther away from the electrode assembly 22 than the first surface 2112, that is, the first surface 2112 is located between the connecting surface 232 and the electrode assembly 22 in the thickness direction X of the wall, so that the electrode terminal 23 is a structure that protrudes from the side of the wall 211 away from the electrode assembly 22 in the thickness direction X of the wall.

[0174] By setting the connection surface 232 of the electrode terminal 23 used to connect to the busbar component 30 to be farther away from the electrode assembly 22 than the first surface 2112 of the electrode assembly 22 which is away from the wall portion 211, the electrode terminal 23 is a structure that protrudes from the first surface 2112 in the thickness direction X of the wall portion. On the one hand, it is convenient to connect the busbar component 30 with the connection surface 232 of the electrode terminal 23, which is beneficial to reducing the difficulty of assembling the busbar component 30 and the electrode terminal 23 to each other. On the other hand, the size of the area corresponding to the connection surface 232 of the electrode terminal 23 can be made thicker to enhance the structural strength of the electrode terminal 23, which is beneficial to improve the connection strength and connection stability between the electrode terminal 23 and the busbar component 30.

[0175] According to some embodiments of the present application, as shown in Figures 5, 6 and 7, a rivet groove 233 is formed at one end of the electrode terminal 23 facing the electrode assembly 22 along the thickness direction X of the wall portion, and the flange portion 231 is arranged around the rivet groove 233, and the projection of the rivet groove 233 is located within the connecting surface 232.

[0176] Among them, the flange portion 231 is arranged around the rivet groove 233, that is, the rivet groove 233 is a structure formed by riveting the electrode terminal 23 from the end facing the electrode assembly 22, so that the rivet groove 233 is formed at the end of the electrode terminal 23 facing the electrode assembly 22, and a flange portion 231 is correspondingly formed around the outside of the rivet groove 233, so that the electrode terminal 23 is riveted to the wall portion 211.

[0177] The projection of the rivet groove 233 is located inside the connecting surface 232 , that is, in the thickness direction X of the wall portion. The rivet groove 233 is a structure entirely covered by the connecting surface 232 .

[0178] By forming a rivet groove 233 on one end of the electrode terminal 23 facing the electrode assembly 22 along the thickness direction X of the wall, and the flange portion 231 is a structure surrounding the outside of the rivet groove 233, it is convenient to rivet from one end of the electrode terminal 23 facing the electrode assembly 22 to achieve the flange portion 231 being riveted on the wall portion 211.

[0179] According to some embodiments of the present application, as shown in FIG. 5 , along the thickness direction X of the wall portion, the wall portion 211 has a first surface 2112 facing away from the electrode assembly 22 , and the bottom surface of the rivet groove 233 is closer to the electrode assembly 22 than the first surface 2112 .

[0180] The first surface 2112 is the surface of the wall portion 211 facing away from the electrode assembly 22 , that is, the first surface 2112 is the outer surface of the wall portion 211 facing away from the interior of the shell 21 .

[0181] The bottom surface of the rivet groove 233 is closer to the electrode assembly 22 than the first surface 2112 , that is, in the thickness direction X of the wall, the bottom surface of the rivet groove 233 is located between the first surface 2112 and the electrode assembly 22 .

[0182] By setting the bottom surface of the rivet groove 233 to be closer to the electrode assembly 22 than the first surface 2112 of the wall portion 211 that is away from the electrode assembly 22, the thickness of the area between the bottom surface of the rivet groove 233 and the connecting surface 232 can be increased, which is beneficial to improving the structural strength of the electrode terminal 23, thereby improving the connection strength and connection stability between the electrode terminal 23 and the busbar component 30.

[0183] In some embodiments, please continue to refer to FIG. 5 , along the thickness direction X of the wall, the wall 211 has a second surface 2113 facing the electrode assembly 22 , and the bottom surface of the rivet groove 233 is closer to the electrode assembly 22 than the second surface 2113 .

[0184] The second surface 2113 is the surface of the wall portion 211 facing the electrode assembly 22 , that is, the second surface 2113 is the inner surface of the wall portion 211 facing the interior of the shell 21 .

[0185] The bottom surface of the rivet groove 233 is closer to the electrode assembly 22 than the second surface 2113 , that is, in the thickness direction X of the wall, the bottom surface of the rivet groove 233 is located between the second surface 2113 and the electrode assembly 22 .

[0186] By setting the bottom surface of the rivet groove 233 to be closer to the electrode assembly 22 than the second surface 2113 of the wall portion 211 facing the electrode assembly 22, the thickness of the area between the bottom surface of the rivet groove 233 and the connecting surface 232 can be further increased, which is beneficial to further improve the structural strength of the electrode terminal 23, thereby further improving the connection strength and connection stability between the electrode terminal 23 and the busbar component 30.

[0187] According to some embodiments of the present application, as shown in Figures 4 and 5 , the battery cell 20 may further include a current collecting member 27. The current collecting member 27 is disposed between the wall portion 211 and the electrode assembly 22, and the current collecting member 27 connects the electrode assembly 22 and the electrode terminal 23 to electrically connect the electrode assembly 22 and the electrode terminal 23.

[0188] The current collecting member 27 connects the electrode terminal 23 and the tab 221 of the electrode assembly 22 to achieve electrical connection between the electrode assembly 22 and the electrode terminal 23. The current collecting member 27 can be made of various materials, such as copper, iron, aluminum, steel, and aluminum alloy.

[0189] Optionally, the current collecting member 27 and the electrode terminal 23 may be welded to each other or abutted to each other. Similarly, the current collecting member 27 and the tab 221 of the electrode assembly 22 may be welded to each other or abutted to each other.

[0190] Alternatively, in FIG. 4 , there are two electrode terminals 23 and two current collecting members 27 , and each electrode terminal 23 is connected to the electrode assembly 22 via one current collecting member 27 to output the positive and negative electrodes of the battery cell 20 .

[0191] The battery cell 20 is further provided with a current collecting member 27 , which connects the electrode terminal 23 and the electrode assembly 22 to achieve electrical connection between the electrode assembly 22 and the electrode terminal 23 , thereby reducing the difficulty of connecting the electrode assembly 22 and the electrode terminal 23 .

[0192] According to some embodiments of the present application, as shown in FIG. 5 , FIG. 6 and FIG. 7 , at least a portion of the current collecting member 27 is accommodated in the rivet groove 233 and connected to the bottom surface of the rivet groove 233 .

[0193] Among them, at least a portion of the current collecting member 27 is accommodated in the rivet groove 233 and connected to the bottom surface of the rivet groove 233. That is, the current collecting member 27 can be accommodated entirely or partially in the rivet groove 233. In Figures 5 and 6, the current collecting member 27 is partially accommodated in the rivet groove 233 and connected to the bottom surface of the rivet groove 233. In other words, the current collecting member 27 has a portion inserted into the rivet groove 233, and the portion of the current collecting member 27 inserted into the rivet groove 233 is connected to the bottom surface of the rivet groove 233, thereby connecting the current collecting member 27 to the electrode terminal 23.

[0194] Exemplarily, the portion of the current collecting member 27 received in the rivet groove 233 is welded to the bottom surface of the rivet groove 233, that is, the portion of the current collecting member 27 received in the rivet groove 233 is welded to the bottom wall of the rivet groove 233. Of course, in other embodiments, the portion of the current collecting member 27 received in the rivet groove 233 may also abut against the bottom surface of the rivet groove 233 or be welded to the side surface of the rivet groove 233.

[0195] By setting at least a portion of the current collecting component 27 to be accommodated in the rivet groove 233 and interconnected with the bottom surface of the rivet groove 233, the current collecting component 27 is made into a structure at least partially inserted in the rivet groove 233. Such a structure can play a certain positioning role for the current collecting component 27, which is beneficial to improving the assembly accuracy between the current collecting component 27 and the electrode terminal 23, and can reduce the difficulty of connecting the current collecting component 27 and the electrode terminal 23.

[0196] According to some embodiments of the present application, as shown in Figures 4 and 5 , the wall portion 211 is provided with a mounting hole 2111 that penetrates the wall portion 211 along the wall portion's thickness direction X. The battery cell 20 may further include a seal 26 disposed between the wall portion 211 and the electrode terminal 23, with at least a portion of the seal 26 located within the mounting hole 2111 to seal the gap between the electrode terminal 23 and the wall surface of the mounting hole 2111. Along the wall portion's thickness direction X, the seal 26 abuts against the side of the flange portion 231 facing away from the electrode assembly 22. The current collecting member 27 is welded to the bottom surface of the rivet groove 233.

[0197] Among them, the mounting hole 2111 passes through the wall portion 211 along the thickness direction X of the wall portion, that is, the mounting hole 2111 is a structure extending along the thickness direction X of the wall portion, and the two ends of the mounting hole 2111 in the thickness direction X of the wall portion respectively pass through the first surface 2112 and the second surface 2113 of the wall portion 211.

[0198] The seal 26 is arranged between the wall portion 211 and the electrode terminal 23. The seal 26 serves to seal the gap between the electrode terminal 23 and the hole wall of the mounting hole 2111. The material of the seal 26 can be various, for example, the material of the seal 26 can be rubber, silicone or plastic.

[0199] The current collecting component 27 is welded to the bottom surface of the riveted groove 233, that is, the part of the current collecting component 27 accommodated in the riveted groove 233 is welded to the bottom wall of the riveted groove 233. For example, the current collecting component 27 and the bottom surface of the riveted groove 233 can be welded to each other by welding processes such as laser welding or ultrasonic welding.

[0200] By setting the current collecting component 27 as a structure welded to the bottom surface of the rivet groove 233, the connection strength and stability between the current collecting component 27 and the electrode terminal 23 are improved, and by inserting at least a portion of the current collecting component 27 into the rivet groove 233 and welding it to the bottom surface of the rivet groove 233, the area where the current collecting component 27 and the electrode terminal 23 are welded to each other can be kept away from the seal 26, thereby effectively reducing the impact of the welding of the current collecting component 27 and the electrode terminal 23 on the seal 26, which is beneficial to alleviate the phenomenon of the seal 26 being burned, and further effectively improving the sealing effect of the seal 26 on the electrode terminal 23 and the hole wall of the mounting hole 2111.

[0201] According to some embodiments of the present application, as shown in Figures 5 and 6, the current collecting member 27 may include a base 271 and a first protrusion 272. The base 271 is disposed between the electrode assembly 22 and the wall 211 along the thickness direction X of the wall, and the base 271 is connected to the electrode assembly 22. Along the thickness direction X of the wall, the first protrusion 272 is protruding from the side of the base 271 facing away from the electrode assembly 22. The first protrusion 272 is inserted into the rivet groove 233 and connected to the bottom surface of the rivet groove 233.

[0202] Among them, the base 271 of the current collecting component 27 is a sheet structure and is arranged between the electrode assembly 22 and the wall portion 211 in the thickness direction X of the wall portion to connect the electrode ear 221 of the electrode assembly 22, thereby realizing the electrical connection between the current collecting component 27 and the electrode assembly 22.

[0203] Along the thickness direction X of the wall portion, part of the first insulating member 24 is arranged between the wall portion 211 and the base 271 of the current collecting member 27 to insulate and isolate the wall portion 211 and the base 271 of the current collecting member 27, thereby helping to reduce the risk of short circuit between the wall portion 211 and the base 271 of the current collecting member 27.

[0204] Along the thickness direction X of the wall, the first protrusion 272 is protruding from the side of the base 271 away from the electrode assembly 22 , that is, the first protrusion 272 is a structure protruding from the side of the base 271 away from the electrode assembly 22 toward the direction away from the electrode assembly 22 .

[0205] The first protrusion 272 is inserted into the rivet groove 233 and connected to the bottom surface of the rivet groove 233. That is, in the thickness direction X of the wall portion, a portion of the first protrusion 272 is inserted into the rivet groove 233, and the end of the first protrusion 272 facing away from the electrode assembly 22 is connected to the bottom surface of the rivet groove 233, so that the first protrusion 272 is connected to the electrode terminal 23. Exemplarily, the first protrusion 272 is welded to the bottom surface of the rivet groove 233, that is, the first protrusion 272 and the bottom wall of the rivet groove 233 are welded to each other.

[0206] The current collecting component 27 is provided with a base 271 and a first protrusion 272 protruding from the side of the base 271 away from the electrode assembly 22, and the first protrusion 272 is inserted into the rivet groove 233 and connected to the bottom surface of the rivet groove 233, so as to realize that at least part of the current collecting component 27 is accommodated in the rivet groove 233 and assembled with the electrode terminal 23. On the one hand, the current collecting component 27 with such a structure facilitates the connection between the current collecting component 27 and the electrode terminal 23, which is beneficial to reducing the difficulty of assembling the current collecting component 27 and the electrode terminal 23. On the other hand, the structure in which the first protrusion 272 is inserted into the first groove 273 can play a certain guiding and limiting role in the process of mutual assembly of the current collecting component 27 and the electrode terminal 23, which is beneficial to improving the assembly efficiency and assembly quality between the current collecting component 27 and the electrode terminal 23.

[0207] According to some embodiments of the present application, as shown in Figures 5, 6 and 7, along the thickness direction X of the wall portion, the flange portion 231 has a third surface 2311 facing the electrode assembly 22, and the rivet groove 233 is recessed from the third surface 2311 in a direction away from the electrode assembly 22, and the third surface 2311 abuts against the base 271.

[0208] Among them, the third surface 2311 is the surface of the flange portion 231 on the side facing the electrode assembly 22 in the thickness direction X of the wall portion, and the rivet groove 233 is recessed from the third surface 2311 in the direction away from the electrode assembly 22, that is, the rivet groove 233 is arranged on the third surface 2311 of the flange portion 231, that is, in the thickness direction X of the wall portion, the rivet groove 233 is recessed from the third surface 2311 of the flange portion 231 in the direction away from the electrode assembly 22 and extends into the electrode terminal 23.

[0209] The third surface 2311 abuts against the base 271 , ie, the base 271 of the current collecting member 27 abuts against the side of the flange portion 231 facing the electrode assembly 22 along the thickness direction X of the wall.

[0210] By arranging the rivet groove 233 of the electrode terminal 23 on the third surface 2311 of the flange portion 231 facing the electrode assembly 22, and the third surface 2311 abuts against the base 271 of the current collecting component 27 in the thickness direction X of the wall portion, it is convenient to insert the first protrusion 272 of the current collecting component 27 into the rivet groove 233, and it is beneficial to further increase the contact area between the current collecting component 27 and the electrode terminal 23, so as to improve the flow effect between the current collecting component 27 and the electrode terminal 23.

[0211] According to some embodiments of the present application, as shown in FIG. 5 and FIG. 6 , along the thickness direction X of the wall portion, a first groove 273 is formed on a side of the current collecting member 27 facing the electrode assembly 22 and corresponding to a position of the first protrusion 272 .

[0212] Exemplarily, the first protrusion 272 of the current collecting member 27 is formed by a stamping process, whereby the first protrusion 272 is formed on the side of the current collecting member 27 facing away from the electrode assembly 22, and the first recess 273 is formed on the side of the current collecting member 27 facing the electrode assembly 22 at a position corresponding to the first protrusion 272. Of course, the forming process of the first protrusion 272 of the current collecting member 27 is not limited to this. In other embodiments, the first protrusion 272 of the current collecting member 27 may also be formed by a processing process such as casting or milling.

[0213] It should be noted that the first protrusion 272 is welded to the bottom surface of the rivet groove 233, and part of the weld mark formed by the welding connection between the first protrusion 272 and the bottom surface of the rivet groove 233 is formed on the bottom surface of the first groove 273, that is, the weld mark formed by the welding connection between the first protrusion 272 and the bottom surface of the rivet groove 233 extends into the first groove 273, so that the welding connection between the current collecting component 27 and the electrode terminal 23 is a structure in which the welding connection is performed from the side of the current collecting component 27 where the first groove 273 is provided.

[0214] By forming a first groove 273 on the side of the current collecting component 27 facing the electrode assembly 22 and in the area corresponding to the first protrusion 272, the current collecting component 27 is a structure that can be formed by stamping, so that the first protrusion 272 and the first groove 273 are respectively formed on both sides of the current collecting component 27, which is conducive to reducing the manufacturing difficulty of the current collecting component 27.

[0215] According to some embodiments of the present application, referring to Figures 8 and 9 , Figure 8 is a partial cross-sectional view of a battery cell 20 provided in further embodiments of the present application, and Figure 9 is a cross-sectional view of an electrode terminal 23 of a battery cell 20 provided in further embodiments of the present application. A connecting portion 2331 is provided protruding from the bottom surface of the rivet groove 233, and the connecting portion 2331 is connected to the current collecting member 27.

[0216] The bottom surface of the rivet groove 233 is provided with a connecting portion 2331 , that is, the bottom surface of the rivet groove 233 is connected with the connecting portion 2331 , so that the electrode terminal 23 is connected to the current collecting member 27 via the connecting portion 2331 .

[0217] For example, in FIG9 , the electrode terminal 23 and the connecting portion 2331 are integrally formed. The electrode terminal 23 can be formed by an integral molding process such as casting or stamping. Of course, in other embodiments, the electrode terminal 23 and the connecting portion 2331 can also be separate structures. For example, the connecting portion 2331 can be connected to the bottom surface of the rivet groove 233 by welding or clamping.

[0218] By protruding a connecting portion 2331 on the bottom surface of the rivet groove 233, the current collecting component 27 is connected to the connecting portion 2331 to achieve electrical connection between the current collecting component 27 and the electrode terminal 23. The current collecting component 27 with this structure is simple in structure and easy to assemble. There is no need to provide a protruding structure on the current collecting component 27 to be inserted into the rivet groove 233, which is beneficial to reducing the processing difficulty of the current collecting component 27.

[0219] According to some embodiments of the present application, as shown in FIG8 , the wall portion 211 is provided with a mounting hole 2111 that extends through the wall portion 211 along the wall portion's thickness direction X. The battery cell 20 may further include a seal 26 disposed between the wall portion 211 and the electrode terminal 23, with at least a portion of the seal 26 located within the mounting hole 2111 to seal the gap between the electrode terminal 23 and the wall surface of the mounting hole 2111. Along the wall portion's thickness direction X, the seal 26 abuts against the side of the flange portion 231 facing away from the electrode assembly 22. The current collecting member 27 is welded to the connection portion 2331.

[0220] Among them, the mounting hole 2111 passes through the wall portion 211 along the thickness direction X of the wall portion, that is, the mounting hole 2111 is a structure extending along the thickness direction X of the wall portion, and the two ends of the mounting hole 2111 in the thickness direction X of the wall portion respectively pass through the first surface 2112 and the second surface 2113 of the wall portion 211.

[0221] The seal 26 is arranged between the wall portion 211 and the electrode terminal 23. The seal 26 serves to seal the gap between the electrode terminal 23 and the hole wall of the mounting hole 2111. The material of the seal 26 can be various, for example, the material of the seal 26 can be rubber, silicone or plastic.

[0222] The current collecting member 27 is welded to the connecting portion 2331, that is, the current collecting member 27 is welded to the connecting portion 2331 protruding from the bottom surface of the rivet groove 233 to achieve an electrical connection between the current collecting member 27 and the electrode terminal 23. For example, the current collecting member 27 and the connecting portion 2331 can be welded to each other using a welding process such as laser welding or ultrasonic welding.

[0223] It should be noted that the weld mark formed by the welding connection between the current collecting component 27 and the connecting portion 2331 extends to the side of the current collecting component 27 facing the electrode assembly 22, so that the welding connection between the current collecting component 27 and the connecting portion 2331 is a structure in which the welding connection is performed from the side of the current collecting component 27 facing the electrode assembly 22.

[0224] By setting the current collecting component 27 as a structure welded to the connecting portion 2331, the connection strength and stability between the current collecting component 27 and the electrode terminal 23 are improved, and by welding the current collecting component 27 and the connecting portion 2331 protruding from the bottom surface of the rivet groove 233 to each other, the area where the current collecting component 27 and the electrode terminal 23 are welded to each other can be made away from the sealing member 26, thereby effectively reducing the impact of the welding of the current collecting component 27 and the electrode terminal 23 on the sealing member 26, which is beneficial to alleviate the phenomenon of the sealing member 26 being burned, and further effectively improving the sealing effect of the sealing member 26 on the electrode terminal 23 and the hole wall of the mounting hole 2111.

[0225] According to some embodiments of the present application, as shown in Figures 8 and 9, along the thickness direction X of the wall portion, the flange portion 231 has a third surface 2311 facing the electrode assembly 22, the rivet groove 233 is recessed from the third surface 2311 in a direction away from the electrode assembly 22, and the end surface of one end of the connecting portion 2331 facing the electrode assembly 22 is flush with the third surface 2311.

[0226] Among them, the third surface 2311 is the surface of the flange portion 231 facing the electrode assembly 22 in the thickness direction X of the wall portion, and the rivet groove 233 is recessed from the third surface 2311 in the direction away from the electrode assembly 22, that is, the rivet groove 233 is arranged on the third surface 2311 of the flange portion 231 facing the electrode assembly 22.

[0227] The end face of the connecting portion 2331 facing the electrode assembly 22 is flush with the third surface 2311, that is, the end of the connecting portion 2331 facing the electrode assembly 22 is flush with the side of the flange portion 231 facing the electrode assembly 22, that is, the size of the connecting portion 2331 in the thickness direction X of the wall is equal to the groove depth of the rivet groove 233 in the thickness direction X of the wall, so that the current collecting component 27 can be connected to the connecting portion 2331 while also being able to abut against the third surface 2311.

[0228] By setting the end surface of the connecting portion 2331 facing the electrode assembly 22 to be flush with the third surface 2311 of the flange portion 231 provided with the rivet groove 233, the size of the connecting portion 2331 in the thickness direction X of the wall portion is equal to the groove depth of the rivet groove 233, thereby facilitating setting the side of the current collecting component 27 facing the connecting portion 2331 to a planar structure. On the one hand, it can reduce the processing difficulty of the current collecting component 27. On the other hand, while reducing the connection difficulty between the current collecting component 27 and the connecting portion 2331, it can also achieve mutual abutment between the current collecting component 27 and the third surface 2311, which is beneficial to increase the flow area between the current collecting component 27 and the electrode terminal 23.

[0229] It should be noted that the structure of the battery cell 20 is not limited to this. In some embodiments, referring to FIG. 10 , which is a partial cross-sectional view of a battery cell 20 provided in yet other embodiments of the present application, along the thickness direction X of the wall portion, the flange portion 231 has a third surface 2311 facing the electrode assembly 22 , the rivet groove 233 is recessed from the third surface 2311 in a direction away from the electrode assembly 22 , and the connecting portion 2331 protrudes from the third surface 2311 .

[0230] Among them, the connecting portion 2331 protrudes from the third surface 2311, that is, the end surface of the connecting portion 2331 facing the electrode assembly 22 in the thickness direction X of the wall is closer to the electrode assembly 22 than the third surface 2311, that is, the connecting portion 2331 extends a rivet groove 233 in the thickness direction X of the wall.

[0231] By setting the connecting portion 2331 to protrude from the third surface 2311 of the flange portion 231 provided with the rivet groove 233 in the thickness direction X of the wall portion, the end surface of the connecting portion 2331 facing the electrode assembly 22 is closer to the electrode assembly 22 than the third surface 2311 of the flange portion 231 provided with the rivet groove 233, thereby facilitating the mutual connection between the current collecting component 27 and the connecting portion 2331, and helping to reduce the gap between the current collecting component 27 and the connecting portion 2331, which causes the poor connection quality between the current collecting component 27 and the connecting portion 2331.

[0232] According to some embodiments of the present application, as shown in Figure 10, along the thickness direction X of the wall, a second groove 274 is provided on the side of the current collecting member 27 facing away from the electrode assembly 22, and the connecting portion 2331 is inserted into the second groove 274 and connected to the bottom surface of the second groove 274.

[0233] The second groove 274 is provided on the side of the current collecting member 27 away from the electrode assembly 22 , that is, the second groove 274 is formed on the surface of the current collecting member 27 away from the electrode assembly 22 in the thickness direction X of the wall.

[0234] The connecting portion 2331 is inserted into the second groove 274 and connected to the bottom surface of the second groove 274. That is, the connecting portion 2331 extends into the second groove 274 of the current collecting component 27 along the thickness direction X of the wall portion, and the end of the connecting portion 2331 facing the electrode assembly 22 is connected to the bottom surface of the second groove 274 to realize the electrical connection between the current collecting component 27 and the electrode terminal 23.

[0235] By providing a second groove 274 on the side of the current collecting component 27 facing away from the electrode assembly 22, and the connecting portion 2331 is inserted into the second groove 274 and interconnected with the bottom surface of the second groove 274, this structure can play a certain positioning role for the current collecting component 27, which is beneficial to improving the assembly accuracy between the current collecting component 27 and the electrode terminal 23, and can reduce the difficulty of connecting the current collecting component 27 and the electrode terminal 23.

[0236] In some embodiments, referring to FIG. 10 , along the thickness direction X of the wall, a second protrusion 275 is formed on the side of the current collecting member 27 facing the electrode assembly 22 and corresponding to the position of the second groove 274 .

[0237] Exemplarily, the second groove 274 provided on the side of the current collecting member 27 facing away from the electrode assembly 22 is formed by a stamping process, so that the second groove 274 is formed on the side of the current collecting member 27 facing away from the electrode assembly 22, and the second protrusion 275 is formed on the side of the current collecting member 27 facing the electrode assembly 22 and at a position corresponding to the second groove 274. Of course, the processing technology for the second groove 274 provided on the side of the current collecting member 27 facing away from the electrode assembly 22 is not limited to this. In other embodiments, the second groove 274 provided on the side of the current collecting member 27 facing away from the electrode assembly 22 can also be formed by a processing process such as casting or milling.

[0238] By forming a second protrusion 275 on the side of the current collecting component 27 facing the electrode assembly 22 and corresponding to the area of ​​the second groove 274, the current collecting component 27 is a structure that can be formed by stamping, so that the second groove 274 and the second protrusion 275 are respectively formed on both sides of the current collecting component 27, which is conducive to reducing the manufacturing difficulty of the current collecting component 27.

[0239] According to some embodiments of the present application, as shown in Figure 10, along the thickness direction X of the wall portion, the flange portion 231 has a third surface 2311 facing the electrode assembly 22, and the rivet groove 233 is recessed from the third surface 2311 in a direction away from the electrode assembly 22, and the third surface 2311 abuts against the current collecting component 27.

[0240] Among them, the third surface 2311 is the surface of the flange portion 231 facing the electrode assembly 22 in the thickness direction X of the wall portion, and the rivet groove 233 is recessed from the third surface 2311 in the direction away from the electrode assembly 22, that is, the rivet groove 233 is arranged on the third surface 2311 of the flange portion 231.

[0241] The third surface 2311 abuts against the current collecting component 27, that is, after the connecting portion 2331 is inserted into the second groove 274 of the current collecting component 27 and is interconnected with the bottom surface of the second groove 274, the side of the current collecting component 27 facing away from the electrode assembly 22 abuts against the third surface 2311 of the flange portion 231, that is, in the thickness direction X of the wall portion, the size of the connecting portion 2331 protruding from the third surface 2311 is equal to the groove depth of the second groove 274.

[0242] By arranging the rivet groove 233 of the electrode terminal 23 on the third surface 2311 of the flange portion 231 facing the electrode assembly 22, and the third surface 2311 abuts against the current collecting component 27 in the thickness direction X of the wall portion, it is beneficial to further increase the contact area between the current collecting component 27 and the electrode terminal 23, thereby improving the flow effect between the current collecting component 27 and the electrode terminal 23.

[0243] According to some embodiments of the present application, as shown in Figures 6, 7, and 9, the wall portion 211 is provided with a mounting hole 2111, which extends through the wall portion 211 along the wall thickness direction X. The electrode terminal 23 may further include a body portion 234 and a retaining portion 235. The body portion 234 extends through the mounting hole 2111 along the wall thickness direction X. The flange portion 231 is connected to an end of the body portion 234 proximal to the electrode assembly 22. The retaining portion 235 is connected to an end of the body portion 234 facing away from the electrode assembly 22. Along the wall thickness direction X, the end of the retaining portion 235 facing away from the electrode assembly 22 forms a connecting surface 232. The retaining portion 235 is located on the side of the wall portion 211 facing away from the electrode assembly 22. The retaining portion 235 and the flange portion 231 are configured to cooperate and clamp the wall portion 211.

[0244] Among them, the main body 234 is inserted into the mounting hole 2111 along the thickness direction X of the wall, that is, the main body 234 of the electrode terminal 23 is a structure inserted into the mounting hole 2111 of the wall 211, and the mounting holes 2111 are extended from both ends of the main body 234 in the thickness direction X of the wall.

[0245] The flange portion 231 is connected to one end of the main body 234 close to the electrode assembly 22, and the limiting portion 235 is connected to one end of the main body 234 away from the electrode assembly 22. That is, the flange portion 231 and the limiting portion 235 are respectively connected to the two ends of the main body 234, and the flange portion 231 is located inside the outer shell 21, and the limiting portion 235 is located outside the outer shell 21, so that the limiting portion 235, the main body 234 and the flange portion 231 of the electrode terminal 23 are arranged in sequence along the thickness direction X of the wall.

[0246] The end of the limiting portion 235 away from the electrode assembly 22 forms a connecting surface 232, that is, the end surface of the limiting portion 235 away from the main body 234 in the thickness direction X of the wall is the connecting surface 232, so that the electrode terminal 23 is a structure connected to the busbar component 30 through the limiting portion 235.

[0247] The stopper 235 and the flange 231 are configured to cooperate with and clamp the wall portion 211. That is, the stopper 235 and the flange 231 are respectively located on either side of the wall portion 211 in the thickness direction X of the wall portion, and the stopper 235 and the flange 231 partially overlap with the wall portion 211, so that the stopper 235 and the flange 231 can cooperate with and clamp the wall portion 211 to assemble the electrode terminal 23 to the wall portion 211. It should be noted that the stopper 235 and the flange 231 can directly clamp the wall portion 211, that is, the stopper 235 and the flange 231 directly abut against the wall portion 211. Of course, the stopper 235 and the flange 231 can also indirectly clamp the wall portion 211, that is, the stopper 235 and the flange 231 can indirectly abut against the wall portion 211 through other components.

[0248] The electrode terminal 23 is a structure riveted to the wall portion 211, that is, the main body 234, the limiting portion 235 and the flanging portion 231 of the electrode terminal 23 are an integrated structure. The electrode terminal 23 is assembled on the wall portion 211 through a riveting process to form the main body 234, the limiting portion 235 and the flanging portion 231. The flanging portion 231 is a structure formed after the electrode terminal 23 is riveted and flanging.

[0249] It should be noted that a rivet groove 233 is formed at one end of the electrode terminal 23 facing the electrode assembly 22, and in an embodiment where the rivet groove 233 is recessed from the third surface 2311 of the flange portion 231 in a direction away from the electrode assembly 22, the rivet groove 233 may extend into the main body portion 234 or may not extend into the main body portion 234. For example, in Figures 7 and 9, the rivet groove 233 is recessed from the third surface 2311 of the flange portion 231 in a direction away from the electrode assembly 22, and the rivet groove 233 extends into the main body portion 234.

[0250] The electrode terminal 23 is provided with a main body portion 234 which is passed through the mounting hole 2111, and the two ends of the main body portion 234 in the thickness direction X of the wall portion are respectively connected to a limiting portion 235 and a flange portion 231. The limiting portion 235 and the flange portion 231 are respectively located on the side of the wall portion 211 away from the electrode assembly 22 and the side facing the electrode assembly 22 in the thickness direction X of the wall portion, so that the flange portion 231 of the electrode terminal 23 can cooperate with the limiting portion 235 to clamp the wall portion 211 after riveting the flange, so as to realize that the electrode terminal 23 is riveted and fixed to the wall portion 211 from the inside of the shell 21, so that the side of the limiting portion 235 away from the electrode assembly 22 forms a connection surface 232 for connecting with the busbar component 30, which is beneficial to increase the connection area between the busbar component 30 and the electrode terminal 23, and thus can effectively improve the connection stability and connection reliability between the electrode terminal 23 and the busbar component 30.

[0251] According to some embodiments of the present application, as shown in Figures 5, 8, and 10, the battery cell 20 may further include a first insulating member 24. Along the thickness direction X of the wall portion, at least a portion of the first insulating member 24 is located between the flange portion 231 and the wall portion 211 to insulate and isolate the flange portion 231 from the wall portion 211.

[0252] At least part of the first insulating member 24 is located between the flange portion 231 and the wall portion 211 , that is, the first insulating member 24 extends between the flange portion 231 and the wall portion 211 so that the flange portion 231 and the wall portion 211 are insulated and isolated by the first insulating member 24 .

[0253] For example, the first insulating member 24 can be made of various materials, such as rubber, plastic, or silicone.

[0254] The battery cell 20 is also provided with a first insulating member 24, and at least a portion of the first insulating member 24 is located between the flange portion 231 and the wall portion 211, so that the first insulating member 24 can play the role of insulating and isolating the flange portion 231 and the wall portion 211, thereby reducing the risk of short circuit between the flange portion 231 and the wall portion 211, which is beneficial to improving the reliability of the battery cell 20.

[0255] According to some embodiments of the present application, as shown in Figures 5, 8, and 10, the battery cell 20 may further include a second insulating member 25. Along the thickness direction X of the wall portion, at least a portion of the second insulating member 25 is located between the limiting portion 235 and the wall portion 211 to insulate and isolate the limiting portion 235 from the wall portion 211.

[0256] In which, at least part of the second insulating member 25 is located between the limiting portion 235 and the wall portion 211, that is, the second insulating member 25 extends between the limiting portion 235 and the wall portion 211, so that the limiting portion 235 and the wall portion 211 are insulated and isolated by the second insulating member 25.

[0257] For example, the second insulating member 25 can be made of various materials, such as rubber, plastic, or silicone.

[0258] The battery cell 20 is also provided with a second insulating member 25, and at least a portion of the second insulating member 25 is located between the limiting portion 235 and the wall portion 211, so that the second insulating member 25 can play the role of insulating and isolating the limiting portion 235 and the wall portion 211, thereby reducing the risk of short circuit between the limiting portion 235 and the wall portion 211, which is beneficial to improving the reliability of the battery cell 20.

[0259] In some embodiments, referring to Figures 4 and 5 , along the thickness direction X of the wall portion, a receiving groove 2114 is provided on the side of the wall portion 211 facing away from the electrode assembly 22 , the mounting hole 2111 is provided on the bottom surface of the receiving groove 2114 , and at least a portion of the second insulating member 25 is accommodated in the receiving groove 2114 .

[0260] The receiving groove 2114 is disposed on the first surface 2112 of the wall portion 211 . The receiving groove 2114 is a structure that is recessed from the first surface 2112 toward the electrode assembly 22 in the thickness direction X of the wall portion.

[0261] Illustratively, a portion of the second insulating member 25 is accommodated in the accommodation groove 2114 . Of course, in other embodiments, the second insulating member 25 may also be entirely located in the accommodation groove 2114 .

[0262] By providing an accommodating groove 2114 for accommodating the second insulating member 25 on the side of the wall portion 211 away from the electrode assembly 22, it is convenient to assemble the second insulating member 25 between the limiting portion 235 and the wall portion 211, which can play a role in assembly positioning of the second insulating member 25, which is beneficial to reducing the difficulty of assembling the second insulating member 25, and can play a certain protective role for the second insulating member 25, so as to reduce the wear or damage of the second insulating member 25 during use.

[0263] According to some embodiments of the present application, referring to FIG11 , FIG11 is a cross-sectional view of an electrode terminal 23 of a battery cell 20 according to some embodiments of the present application, in other embodiments. The electrode terminal 23 includes a first material layer 236 and a second material layer 237, which are laminated together along the thickness direction X of the wall. The first material layer 236 is located on the side of the second material layer 237 facing the electrode assembly 22, while the second material layer 237 forms a connection surface 232 on the side facing away from the first material layer 236. The first material layer 236 and the second material layer 237 are made of different materials. The first material layer 236 is used to connect to the tab 221 of the electrode assembly 22, and the material of the first material layer 236 is the same as the material of the tab 221 of the electrode assembly 22. The second material layer 237 is used to connect to the current collector 30, and the material of the second material layer 237 is the same as the material of the current collector 30.

[0264] Among them, the electrode terminal 23 includes a first material layer 236 and a second material layer 237 that are composited with each other. The material of the first material layer 236 and the material of the second material layer 237 are different. That is, the electrode terminal 23 is composed of a first material layer 236 and a second material layer 237 of different materials composited and connected with each other. Optionally, the first material layer 236 and the second material layer 237 of the electrode terminal 23 can be connected by a composite process such as hot pressing or cold pressing.

[0265] The first material layer 236 and the second material layer 237 are stacked along the thickness direction X of the wall portion, that is, the first material layer 236 and the second material layer 237 are arranged along the thickness direction X of the wall portion and then compositely connected.

[0266] The side of the second material layer 237 facing away from the first material layer 236 forms the connection surface 232 . That is, the connection surface 232 is formed on the second material layer 237 , so that the surface of the second material layer 237 facing away from the first material layer 236 forms the connection surface 232 .

[0267] The first material layer 236 is used to be connected to the pole ear 221 of the electrode assembly 22. The material of the first material layer 236 is the same as the material of the pole ear 221 of the electrode assembly 22, that is, the first material layer 236 in the electrode terminal 23 is interconnected with the pole ear 221 of the electrode assembly 22, and the material of the first material layer 236 is the same as the material of the pole ear 221 of the electrode assembly 22, so that the material of the part of the electrode terminal 23 used for welding with the pole ear 221 of the electrode assembly 22 is the same, which is conducive to reducing the difficulty of welding and improving the welding quality.

[0268] The second material layer 237 is used to be connected to the convergence component 30. The material of the second material layer 237 is the same as that of the convergence component 30. That is, the second material layer 237 in the electrode terminal 23 is interconnected with the convergence component 30, and the material of the second material layer 237 is the same as that of the convergence component 30, so that the material of the part of the electrode terminal 23 used for welding with the convergence component 30 is the same, which is conducive to reducing the difficulty of welding and improving the welding quality.

[0269] It should be noted that the material of the first material layer 236 is the same as the material of the electrode tab 221 of the electrode assembly 22, which means that the main component of the first material layer 236 is the same as the main component of the electrode tab 221 of the electrode assembly 22. For example, if the first material layer 236 and the electrode tab 221 of the electrode assembly 22 are both made of a single material, such as copper or aluminum, then the first material layer 236 and the electrode tab 221 of the electrode assembly 22 are composed of the same metal elements; if the first material layer 236 and the electrode tab 221 of the electrode assembly 22 are alloy materials or mixed materials, such as aluminum alloy or steel, then the material of the first material layer 236 and the electrode tab 221 of the electrode assembly 22 is the same, which means that the main component of the first material layer 236 and the electrode tab 221 of the electrode assembly 22 is the same. If the first material layer 236 and the electrode tab 221 of the electrode assembly 22 are only different in the content of the components, they are also the same material. Similarly, the material of the second material layer 237 is the same as the material of the convergence component 30, which means that the main component of the second material layer 237 is the same as the main component of the convergence component 30. For example, if the second material layer 237 and the convergence component 30 are both made of a single material, such as copper or aluminum, then the second material layer 237 and the convergence component 30 are composed of the same metal elements; if the second material layer 237 and the convergence component 30 are alloy materials or mixed materials, such as aluminum alloy or steel, then the material of the second material layer 237 and the convergence component 30 is the same, which means that the main components of the second material layer 237 and the convergence component 30 are the same. If the second material layer 237 and the convergence component 30 are different only in the content of the components, they are also the same material.

[0270] For example, in FIG11 , the electrode terminal 23 includes a body portion 234, a stopper portion 235 connected to both ends of the body portion 234, and a flange portion 231. The connection interface between the first material layer 236 and the second material layer 237 is located within the stopper portion 235. Of course, the structure of the electrode terminal 23 is not limited to this. In other embodiments, the connection interface between the first material layer 236 and the second material layer 237 may also be located within the body portion 234 or within the flange portion 231.

[0271] By setting the electrode terminal 23 to be composed of a first material layer 236 and a second material layer 237 that are stacked and compositely connected along the thickness direction X of the wall, and the material of the first material layer 236 is the same as the material of the pole ear 221 of the electrode assembly 22, and the material of the second material layer 237 is the same as the material of the busbar component 30, the electrode terminal 23 can connect the busbar component 30 and the pole ear 221 of the electrode assembly 22 of different materials, so that the electrode terminal 23 of this structure can realize the connection between the pole ear 221 of the electrode assembly 22 of different materials and the busbar component 30, which is beneficial to improving the overcurrent effect and can alleviate the quality problems caused by the mutual assembly and connection between different materials.

[0272] According to some embodiments of the present application, as shown in Figures 3 and 4, the housing 21 may include a shell 212 and an end cap 213. The shell 212 has an interior formed with an accommodating cavity having an opening 2121, which is used to accommodate the electrode assembly 22. The end cap 213 closes the opening 2121 and is a wall portion 211.

[0273] The end cover 213 is the wall portion 211 , that is, the electrode terminal 23 is riveted to the end cover 213 .

[0274] By setting the wall portion 211 of the outer shell 21 as the end cover 213 of the outer shell 21 for closing the opening 2121 of the shell 212, the battery cell 20 adopting this structure is convenient for assembling the electrode terminal 23 on the end cover 213, and is convenient for assembling and connecting the electrode terminal 23 and the electrode assembly 22 with each other, which is beneficial to reducing the assembly difficulty of the battery cell 20 and improving the production efficiency of the battery cell 20.

[0275] It should be noted that the structure of the battery cell 20 is not limited to this. In some embodiments, the battery cell 20 may also have other structures. For example, the outer shell 21 may include a shell 212 and an end cap 213. The shell 212 includes an integrally formed sidewall and wall portion 211. The sidewall is arranged around the wall portion 211. Along the thickness direction X of the wall portion, one end of the sidewall is connected to the wall portion 211, and the other end encloses an opening 2121. The sidewall and wall portion 211 together define a cavity for accommodating the electrode assembly 22, and the end cap 213 closes the opening 2121. In other words, the wall portion 211 is the bottom wall of the shell 212 arranged opposite the end cap 213 in the thickness direction X of the wall portion, that is, the electrode terminal 23 is riveted to the bottom wall of the shell 212.

[0276] The shell 212 includes an integrally formed side wall and wall portion 211 , that is, the shell 212 is manufactured using an integral molding process, such as an integral molding process such as stamping, casting or extrusion molding. In other words, the side wall and wall portion 211 of the shell 212 are an integral structure.

[0277] By setting the wall portion 211 of the outer shell 21 as a wall arranged opposite to the end cover 213 in the thickness direction X of the wall portion of the shell 212, the battery cell 20 adopting this structure can make the area of ​​the outer shell 21 where the electrode terminal 23 is installed away from the end cover 213, and make there no direct connection relationship between the wall portion 211 and the end cover 213, thereby alleviating the phenomenon that the force generated when the electrode terminal 23 and other components pull or twist the wall portion 211 acts on the end cover 213, thereby reducing the risk of connection failure between the end cover 213 and the shell 212, and further helping to reduce the risk of leakage of the battery cell 20 during use.

[0278] According to some embodiments of the present application, the present application further provides a battery 100 , which includes the battery cell 20 of any of the above solutions.

[0279] As shown in FIG. 2 , the battery 100 may further include a box body 10 , in which the battery cells 20 are accommodated.

[0280] In some embodiments, the box body 10 may include a first box body 11 and a second box body 12 . The first box body 11 and the second box body 12 cover each other, and the first box body 11 and the second box body 12 jointly define an assembly space for accommodating the battery cells 20 .

[0281] Optionally, the second box body 12 can be a hollow structure with one end open, and the first box body 11 can be a plate-like structure, and the first box body 11 covers the open side of the second box body 12, so that the first box body 11 and the second box body 12 jointly define an assembly space; the first box body 11 and the second box body 12 can also be hollow structures with one side open, and the open side of the first box body 11 covers the open side of the second box body 12.

[0282] Of course, the box body 10 formed by the first box body 11 and the second box body 12 can be in various shapes, such as a cylinder or a rectangular parallelepiped, etc. For example, in FIG2 , the box body 10 is a rectangular parallelepiped structure.

[0283] Optionally, the battery cell 20 disposed within the housing 10 may be one or more. For example, in FIG2 , the housing 10 of the battery 100 includes multiple battery cells 20. These multiple battery cells 20 may be connected in series, in parallel, or in a hybrid configuration. A hybrid configuration refers to multiple battery cells 20 being connected both in series and in parallel. Multiple battery cells 20 may be directly connected in series, in parallel, or in a hybrid configuration, and then the entire structure formed by the multiple battery cells 20 is housed within the housing 10. Alternatively, the battery 100 may be constructed by first connecting multiple battery cells 20 in series, in parallel, or in a hybrid configuration to form a battery module. The multiple battery modules are then connected in series, in parallel, or in a hybrid configuration to form a single structure, which is then housed within the housing 10.

[0284] The battery 100 may further include other structures. For example, the battery 100 may further include a busbar component 30 . The busbar component 30 connects the plurality of battery cells 20 to achieve electrical connection between the plurality of battery cells 20 .

[0285] It should be noted that in some embodiments, the battery 100 may not be provided with a housing 10. The battery 100 includes multiple battery cells 20, and the battery 100 composed of multiple battery cells 20 can be directly assembled on an electrical device to provide electrical energy to the electrical device through the multiple battery cells 20. In other words, the housing 10 can serve as part of the electrical device. Taking the vehicle 1000 as an example, the housing 10 can serve as part of the chassis structure of the vehicle 1000. For example, a portion of the housing 10 can form at least a portion of the floor of the vehicle 1000, or a portion of the housing 10 can form at least a portion of the crossbeam and longitudinal beam of the vehicle 1000.

[0286] According to some embodiments of the present application, the present application further provides an electrical device, which includes the battery cell 20 of any of the above solutions, and the battery cell 20 is used to provide electrical energy to the electrical device.

[0287] The electrical device may be any of the aforementioned devices or systems using the battery cell 20 .

[0288] According to some embodiments of the present application, as shown in Figures 3 to 7 , a battery cell 20 is provided. The battery cell 20 includes a housing 21, an electrode assembly 22, an electrode terminal 23, a current collecting member 27, a seal 26, a first insulating member 24, and a second insulating member 25. The housing 21 has a wall portion 211, which is provided with a mounting hole 2111. The mounting hole 2111 extends through the wall portion 211 along the thickness direction X of the wall portion. The housing 21 includes a shell 212 and an end cap 213. The shell 212 defines a receiving cavity with an opening 2121. The end cap 213 closes the opening 2121. The end cap 213 serves as the wall portion 211. Along the thickness direction X of the wall portion, the wall portion 211 has a first surface 2112 facing away from the electrode assembly 22 and a second surface 2113 facing the electrode assembly 22. The electrode assembly 22 is accommodated within the housing 21 and has a tab 221. The electrode terminal 23 is riveted to the wall portion 211, and the electrode terminal 23 is electrically connected to the electrode assembly 22. The electrode terminal 23 includes a flange portion 231, a main body portion 234, and a limiting portion 235. The main body portion 234 is inserted into the mounting hole 2111 along the thickness direction X of the wall portion. The flange portion 231 is connected to one end of the main body portion 234 close to the electrode assembly 22. The flange portion 231 is located on the side of the wall portion 211 facing the electrode assembly 22. Along the thickness direction X of the wall portion, the flange portion 231 has a third surface 2311 facing the electrode assembly 22. A rivet groove 233 is formed at one end of the electrode terminal 23 facing the electrode assembly 22. The rivet groove 233 is recessed from the third surface 2311 in a direction away from the electrode assembly 22. The bottom surface of the rivet groove 233 is closer to the electrode assembly 22 than the second surface 2113. The stopper 235 is connected to the end of the body 234 facing away from the electrode assembly 22. Along the thickness direction X of the wall, the end of the stopper 235 facing away from the electrode assembly 22 forms a continuously provided connection surface 232. The connection surface 232 is a plane and is used to connect to the busbar component 30. The stopper 235 is located on the side of the wall 211 facing away from the electrode assembly 22. The stopper 235 and the flange portion 231 are configured to cooperate with the clamping wall 211 to rivet the electrode terminal 23 to the wall 211. Along the thickness direction X of the wall, the connection surface 232 is farther away from the electrode assembly 22 than the first surface 2112. The seal 26 is disposed between the wall portion 211 and the electrode terminal 23, with at least a portion of the seal 26 located within the mounting hole 2111 to seal the gap between the electrode terminal 23 and the wall surface of the mounting hole 2111. Along the wall thickness direction X, the seal 26 abuts against the side of the flange 231 facing away from the electrode assembly 22. A current collecting member 27 is disposed between the wall portion 211 and the electrode assembly 22, connecting the electrode assembly 22 and the electrode terminal 23 to electrically connect the two.The current collecting member 27 includes a base 271 and a first protrusion 272. The base 271 is disposed between the electrode assembly 22 and the wall 211 along the wall thickness direction X. The base 271 abuts against the third surface 2311 of the flange 231 and is connected to the tab 221 of the electrode assembly 22. The first protrusion 272 is disposed protrudingly on the side of the base 271 facing away from the electrode assembly 22. The first protrusion 272 is inserted into the rivet groove 233 and welded to the bottom surface of the rivet groove 233. A first groove 273 is formed on the side of the current collecting member 27 facing the electrode assembly 22 along the wall thickness direction X, corresponding to the position of the first protrusion 272. Along the thickness direction X of the wall portion, at least a portion of the first insulating member 24 is located between the flange portion 231 and the wall portion 211, insulating and isolating the flange portion 231 from the wall portion 211. At least a portion of the second insulating member 25 is located between the retaining portion 235 and the wall portion 211, insulating and isolating the retaining portion 235 from the wall portion 211. A receiving groove 2114 is provided on the side of the wall portion 211 facing away from the electrode assembly 22. A mounting hole 2111 is provided at the bottom of the receiving groove 2114, and at least a portion of the second insulating member 25 is received within the receiving groove 2114. The electrode terminal 23 includes a first material layer 236 and a second material layer 237, which are laminated along the thickness direction X of the wall portion. The first material layer 236 is located on the side of the second material layer 237 facing the electrode assembly 22, and the side of the second material layer 237 facing away from the first material layer 236 forms the connection surface 232. The material of the first material layer 236 is different from the material of the second material layer 237. The first material layer 236 is used to connect with the pole ear 221 of the electrode assembly 22, and the material of the first material layer 236 is the same as the material of the pole ear 221 of the electrode assembly 22. The second material layer 237 is used to connect with the convergence component 30, and the material of the second material layer 237 is the same as the material of the convergence component 30.

[0289] It should be noted that, unless there is any conflict, the embodiments and features in the embodiments of this application can be combined with each other.

[0290] The above are merely preferred embodiments of the present application and are not intended to limit the present application. Those skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A battery cell, comprising: a housing having a wall portion; an electrode assembly, contained in the housing; as well as an electrode terminal riveted to the wall portion, the electrode terminal being electrically connected to the electrode assembly; In which, the electrode terminal includes a flange portion, which is formed at one end of the electrode terminal close to the electrode assembly and located on the side of the wall portion facing the electrode assembly along the thickness direction of the wall portion, so as to rivet the electrode terminal to the wall portion, and a continuously arranged connecting surface is formed at one end of the electrode terminal away from the electrode assembly, and the connecting surface is used to connect to the busbar component.

2. The battery cell according to claim 1, wherein: The connecting surface is a plane.

3. The battery cell according to claim 1 or 2, wherein: Along the thickness direction of the wall portion, the wall portion has a first surface facing away from the electrode assembly, and the connecting surface is farther away from the electrode assembly than the first surface.

4. The battery cell according to any one of claims 1 to 3, wherein: A rivet groove is formed at one end of the electrode terminal facing the electrode assembly along the thickness direction of the wall portion, the flange portion is arranged around the rivet groove, and the projection of the rivet groove is located within the connecting surface.

5. The battery cell according to claim 4, wherein: Along the thickness direction of the wall portion, the wall portion has a first surface facing away from the electrode assembly, and the bottom surface of the rivet groove is closer to the electrode assembly than the first surface.

6. The battery cell according to claim 5, wherein: Along the thickness direction of the wall portion, the wall portion has a second surface facing the electrode assembly, and the bottom surface of the rivet groove is closer to the electrode assembly than the second surface.

7. The battery cell according to any one of claims 4 to 6, wherein: The battery cell further comprises: A current collecting member is disposed between the wall portion and the electrode assembly, and the current collecting member connects the electrode assembly and the electrode terminal to electrically connect the electrode assembly and the electrode terminal.

8. The battery cell according to claim 7, wherein: At least a portion of the current collecting member is accommodated in the rivet groove and connected to the groove bottom surface of the rivet groove.

9. The battery cell according to claim 8, wherein: The wall portion is provided with a mounting hole, and the mounting hole penetrates the wall portion along the thickness direction of the wall portion; The battery cell further includes a sealing member, which is disposed between the wall portion and the electrode terminal, and at least a portion of the sealing member is located in the mounting hole to seal a gap between the electrode terminal and a hole wall surface of the mounting hole, and along a thickness direction of the wall portion, the sealing member abuts against a side of the flange portion away from the electrode assembly; Wherein, the current collecting component is welded to the bottom surface of the riveting groove.

10. The battery cell according to claim 8 or 9, wherein: The current collecting component comprises: a base portion, disposed between the electrode assembly and the wall portion along a thickness direction of the wall portion, the base portion being connected to the electrode assembly; The first protrusion is protrudingly arranged on a side of the base away from the electrode assembly. The first protrusion is inserted into the rivet groove and connected to the bottom surface of the rivet groove.

11. The battery cell according to claim 10, wherein: Along the thickness direction of the wall portion, the flange portion has a third surface facing the electrode assembly, the rivet groove is recessed from the third surface in a direction away from the electrode assembly, and the third surface abuts against the base.

12. The battery cell according to claim 10 or 11, wherein: A first groove is formed on a side of the current collecting member facing the electrode assembly and corresponding to a position of the first protrusion along a thickness direction of the wall portion.

13. The battery cell according to claim 7, wherein: A connecting portion is convexly provided on the bottom surface of the riveting groove, and the connecting portion is connected to the current collecting component.

14. The battery cell according to claim 13, wherein: The wall portion is provided with a mounting hole, and the mounting hole penetrates the wall portion along the thickness direction of the wall portion; The battery cell further includes a sealing member, which is disposed between the wall portion and the electrode terminal, and at least a portion of the sealing member is located in the mounting hole to seal a gap between the electrode terminal and a hole wall surface of the mounting hole, and along a thickness direction of the wall portion, the sealing member abuts against a side of the flange portion away from the electrode assembly; Wherein, the current collecting component is connected to the connecting portion by welding.

15. The battery cell according to claim 13 or 14, wherein: Along the thickness direction of the wall portion, the flange portion has a third surface facing the electrode assembly, the rivet groove is recessed from the third surface in a direction away from the electrode assembly, and the end surface of one end of the connecting portion facing the electrode assembly is flush with the third surface.

16. The battery cell according to claim 13 or 14, wherein: Along the thickness direction of the wall portion, the flange portion has a third surface facing the electrode assembly, the rivet groove is recessed from the third surface in a direction away from the electrode assembly, and the connecting portion protrudes from the third surface.

17. The battery cell according to claim 16, wherein: A second groove is provided on a side of the current collecting member away from the electrode assembly along the thickness direction of the wall portion; Wherein, the connecting portion is inserted into the second groove and connected to the groove bottom surface of the second groove.

18. The battery cell according to claim 17, wherein: A second convex portion is formed at a position of the current collecting member facing the electrode assembly and corresponding to the second concave portion along a thickness direction of the wall portion.

19. The battery cell according to any one of claims 13 to 18, wherein: Along the thickness direction of the wall portion, the flange portion has a third surface facing the electrode assembly, the rivet groove is recessed from the third surface in a direction away from the electrode assembly, and the third surface abuts against the current collecting member.

20. The battery cell according to any one of claims 1 to 19, wherein: The wall portion is provided with a mounting hole, and the mounting hole penetrates the wall portion along the thickness direction of the wall portion; The electrode terminal further includes: A main body portion is arranged in the mounting hole along the thickness direction of the wall portion, and the flange portion is connected to an end of the main body portion close to the electrode assembly; The limiting portion is connected to one end of the main body portion away from the electrode assembly. Along the thickness direction of the wall portion, the end of the limiting portion away from the electrode assembly forms the connecting surface. The limiting portion is located on the side of the wall portion away from the electrode assembly. The limiting portion and the flange portion are configured to cooperate to clamp the wall portion.

21. The battery cell according to claim 20, wherein: The battery cell further comprises: A first insulating member is provided, along the thickness direction of the wall portion, wherein at least a portion of the first insulating member is located between the flange portion and the wall portion to insulate and isolate the flange portion and the wall portion.

22. The battery cell according to claim 20 or 21, wherein: The battery cell further comprises: A second insulating member is provided along the thickness direction of the wall portion, wherein at least a portion of the second insulating member is located between the limiting portion and the wall portion to insulate and isolate the limiting portion from the wall portion.

23. The battery cell according to claim 22, wherein: Along the thickness direction of the wall portion, a receiving groove is provided on one side of the wall portion away from the electrode assembly, the mounting hole is provided on the bottom surface of the receiving groove, and at least a portion of the second insulating member is received in the receiving groove.

24. The battery cell according to any one of claims 1 to 23, wherein: The electrode terminal comprises a first material layer and a second material layer which are composited with each other, wherein the first material layer and the second material layer are stacked along the thickness direction of the wall portion, the first material layer is located on a side of the second material layer facing the electrode assembly, and a side of the second material layer which is away from the first material layer forms the connection surface; Among them, the material of the first material layer is different from the material of the second material layer, the first material layer is used to be connected to the pole ear of the electrode assembly, and the material of the first material layer is the same as the material of the pole ear of the electrode assembly, and the second material layer is used to be connected to the convergence component, and the material of the second material layer is the same as the material of the convergence component.

25. The battery cell according to any one of claims 1 to 24, wherein: The housing comprises: A shell body, wherein a receiving cavity with an opening is formed inside, and the receiving cavity is used to receive the electrode assembly; an end cap for closing the opening; Wherein, the end cover is the wall portion.

26. The battery cell according to any one of claims 1 to 24, wherein: The housing comprises: A shell, comprising an integrally formed side wall and the wall portion, wherein the side wall is disposed around the wall portion, and along the thickness direction of the wall portion, one end of the side wall is connected to the wall portion, and the other end is enclosed to form an opening, and the side wall and the wall portion jointly define a housing cavity for housing the electrode assembly; An end cap closes the opening.

27. A battery comprising the battery cell according to any one of claims 1 to 26.

28. An electrical device comprising the battery cell according to any one of claims 1 to 26, wherein the battery cell is used to provide electrical energy.

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