Battery monomer, battery and electric device

Abstract

A battery cell (20), a battery (100), and an electric device. A battery cell (20) includes a case assembly (21), an electrode assembly (22), and a current collecting member (23). The shell assembly (21) comprises an electrode leading-out part (211) used for inputting or outputting electric energy. The electrode assembly (22) is accommodated in the shell assembly (21), the electrode assembly (22) comprises a main body part (221) and a tab (222), the tab (222) is connected to the main body part (221), and the material of the tab (222) is different from that of the electrode leading-out part (211). The current collecting component (23) comprises a first connecting part (231) and a second connecting part (232), the first connecting part (231) and the electrode leading-out part (211) are made of the same material, the second connecting part (232) and the electrode leading-out part (211) are made of the same material, the first connecting part (231) is connected with the second connecting part (232), the first connecting part (231) is connected with the electrode leading-out part (211) in a welded mode, and the second connecting part (232) is connected with the electrode leading-out part (211) in a welded mode.

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 experienced rapid development. Within the electric vehicle sector, power batteries, as the power source for electric vehicles, play an irreplaceable and important role. With the vigorous promotion of new energy vehicles, demand for power battery products is also growing. As core components of new energy vehicles, batteries have high requirements for operational reliability. Among them, the housing of a battery cell is typically equipped with a current collecting member. This current collecting member connects the electrode assembly and the housing to enable the input or output of electrical energy from the battery cell. However, existing battery cells often experience electrolyte leakage during use, resulting in poor reliability.

[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 reliability of the battery cell.

[0005] In a first aspect, an embodiment of the present application provides a battery cell, comprising a shell assembly, an electrode assembly and a current collecting member; the shell assembly comprises an electrode lead-out portion for inputting or outputting electrical energy; the electrode assembly is accommodated in the shell assembly, the electrode assembly comprises a main body portion and a tab, the tab is connected to the main body portion, and the tab and the electrode lead-out portion are made of different materials; the current collecting member is arranged in the shell assembly, the current collecting member comprises a first connecting portion made of the same material as the electrode lead-out portion and a second connecting portion made of the same material as the tab, the first connecting portion is connected to the second connecting portion, the first connecting portion is welded to the electrode lead-out portion, and the second connecting portion is welded to the tab.

[0006] In the above technical solution, the current collecting member is provided with a first connecting portion and a second connecting portion that are interconnected. The first connecting portion is welded to the electrode lead portion, and the second connecting portion is welded to the tab, so as to achieve electrical connection between the electrode assembly and the electrode lead portion, thereby enabling input or output of electrical energy to the battery cell. By setting the material of the first connecting portion to be the same as the material of the electrode lead portion of the housing assembly, and setting the material of the second connecting portion to be the same as the material of the tab, the battery cell with this structure, on the one hand, facilitates welding connection between the current collecting member and the electrode lead portion, and on the other hand, reduces the difficulty of assembling the current collecting member and the electrode lead portion of the housing assembly, and between the current collecting member and the tab of the electrode assembly, thereby improving the assembly efficiency of the battery cell. On the other hand, the current collecting member and the electrode lead portion of the housing assembly can be welded together using the same material, thereby alleviating the phenomenon of different melting points and thermal expansion coefficients caused by welding the current collecting member and the electrode lead portion made of different materials. Therefore, the phenomenon of welding cracks between the current collecting member and the electrode lead portion can be reduced, which helps to reduce the risk of battery cell leakage and effectively improve the reliability of the battery cell.

[0007] In some embodiments, the current collecting member is arranged between the main body and the electrode lead-out portion along the first direction; wherein, along the first direction, the first connecting portion and the second connecting portion are stacked, and the first connecting portion is located on the side of the second connecting portion facing the electrode lead-out portion.

[0008] In the above technical solution, the first connecting portion and the second connecting portion of the current collecting component are stacked along the first direction between the main body and the electrode lead-out portion, and the first connecting portion is arranged facing the electrode lead-out portion, thereby facilitating the welding of the first connecting portion of the current collecting component and the electrode lead-out portion of the shell assembly, which is beneficial to reducing the difficulty of assembling the current collecting component and the electrode lead-out portion, thereby improving the assembly efficiency of the battery cell.

[0009] In some embodiments, along the first direction, the tab is disposed on a side of the main body facing the second connecting portion.

[0010] In the above technical solution, by arranging the electrode tab to be located on the side of the main body facing the second connecting portion in the first direction, the electrode tab and the second connecting portion are arranged facing each other in the first direction, thereby facilitating the mutual welding of the second connecting portion of the current collecting component and the electrode tab of the electrode assembly, which is beneficial to reducing the difficulty of assembly between the current collecting component and the electrode tab.

[0011] In some embodiments, along the first direction, the second connecting portion has a connecting area not covered by the first connecting portion, and the connecting area is welded to the tab.

[0012] In the above technical solution, the area of ​​the second connection part that is not covered by the first connection part in the first direction forms a connection area for welding with the pole tab, that is, the area of ​​the second connection part used for welding with the pole tab is not blocked by the first connection part, so that when the second connection part and the pole tab are welded to each other, the welding heat only needs to pass through the connection area of ​​the second connection part to complete the welding connection between the first connection part and the pole tab, thereby reducing the welding difficulty between the current collecting component and the pole tab on the one hand, and on the other hand, the welding heat does not need to pass through the first connection part before welding the first connection part and the pole tab, shortening the transfer path of the welding heat, which is conducive to improving the welding quality and welding efficiency between the first connection part and the pole tab.

[0013] In some embodiments, the first connecting portion is provided with a first through hole, the first through hole passes through both sides of the first connecting portion in the first direction, and the second connecting portion forms the connecting region in an area corresponding to the first through hole.

[0014] In the above technical solution, a first through hole is provided on the first connecting part and passes through both sides of the first connecting part, so that the second connecting part is avoided through the first through hole, thereby realizing that the second connecting part has a connection area not covered by the first connecting part. The structure is simple and easy to implement.

[0015] In some embodiments, the connection area is provided with a second through hole connected to the first through hole, the second through hole passes through both sides of the second connection portion in the first direction, and the aperture of the second through hole is smaller than the aperture of the first through hole.

[0016] In the above technical solution, by providing a second through-hole interconnected with the first through-hole in the connection area of ​​the second connecting portion, the first through-hole and the second through-hole cooperate to form a passage for electrolyte to pass through, allowing the electrolyte to enter the electrode assembly through the first and second through-holes, thereby improving the wettability of the electrode assembly and, in turn, the performance of the battery cell. Furthermore, by setting the diameter of the second through-hole smaller than that of the first through-hole, the area of ​​the connection area not provided with the second through-hole can be welded to the tab, facilitating welding of the second connecting portion to the tab.

[0017] In some embodiments, an outer circumferential surface of the first connecting portion is flush with an outer circumferential surface of the second connecting portion.

[0018] In the above technical solution, by setting the outer peripheral surface of the first connecting part and the outer peripheral surface of the second connecting part to be flush with each other, the structure of the current collecting component is made more regular, which facilitates the installation of the current collecting component and the welding connection of the current collecting component to the electrode lead-out part and the tab, and can reduce the risk of interference between the current collecting component and other structures of the battery cell.

[0019] In some embodiments, the connection region surrounds an outer side of a projection of the first connection portion on the second connection portion along the first direction.

[0020] In the above technical solution, by setting the connection area to surround the outside of the projection of the first connection part on the second connection part along the first direction, the current collecting component is a structure in which the edge of the second connection part exceeds the edge of the first connection part, so that the first connection part avoids the second connection part, thereby realizing that the second connection part has a connection area that is not covered by the first connection part. The structure is simple and easy to implement.

[0021] In some embodiments, the first connecting portion is provided with a first through hole, the first through hole passes through both sides of the first connecting portion in the first direction, the second connecting portion is provided with a second through hole, the second through hole passes through both sides of the second connecting portion in the first direction, and the first through hole is connected to the second through hole.

[0022] In the above technical solution, a first through hole is provided on the first connecting portion, and a second through hole is provided on the second connecting portion, and the first through hole and the second through hole are connected to each other, so that the first through hole and the second through hole can cooperate to form a channel for the electrolyte to pass through, so that the electrolyte can enter the electrode assembly after passing through the first through hole and the second through hole, which is beneficial to improving the wetting effect of the electrode assembly, and thus can improve the performance of the battery cell.

[0023] In some embodiments, the first through hole and the second through hole are coaxially arranged and have the same radius.

[0024] In the above technical solution, by setting the first through hole and the second through hole as a coaxial structure with equal radius, the first through hole and the second through hole can be respectively processed on the first connection part and the second connection part after the first connection part and the second connection part are stacked on each other. There is no need to process the first through hole and the second through hole on the first connection part and the second connection part respectively and then stack the first connection part and the second connection part. Therefore, the processing technology and production rhythm of the current collecting component can be optimized, and the processing difficulty can be reduced, which is conducive to improving the production efficiency of the current collecting component.

[0025] In some embodiments, the first connecting portion and the second connecting portion are both disc structures, and the first connecting portion and the second connecting portion are coaxially arranged.

[0026] In the above technical solution, by setting the first connecting part and the second connecting part as a coaxial structure, the structure of the current collecting component is made more regular, thereby facilitating the installation of the current collecting component and helping to save the space occupied by the current collecting component in the shell assembly, thereby improving the internal space utilization of the battery cell.

[0027] In some embodiments, along the first direction, the current collecting component is arranged between the main body and the electrode lead-out portion; the first connecting portion surrounds the outside of the second connecting portion, and the inner circumference of the first connecting portion is connected to the outer circumference of the second connecting portion; or, the second connecting portion surrounds the outside of the first connecting portion, and the inner circumference of the second connecting portion is connected to the outer circumference of the first connecting portion.

[0028] In the above technical solution, by arranging the first connection part and the second connection part of the current collecting component into a structure that surrounds each other, that is, the first connection part surrounds the outside of the second connection part, or the second connection part surrounds the outside of the first connection part, the current collecting component adopting this structure can save the space occupied by the current collecting component in the first direction, thereby effectively improving the internal space utilization of the battery cell, thereby improving the energy density of the battery cell.

[0029] In some embodiments, the first connection portion is welded to the second connection portion to form a first weld mark, and the first connection portion is welded to the electrode lead portion to form a second weld mark; wherein, along the first direction, the current collecting member is arranged between the main body and the electrode lead portion, and the projections of the first weld mark and the second weld mark in a plane perpendicular to the first direction do not overlap.

[0030] In the above technical solution, by arranging the first weld mark and the second weld mark so that their projections in the first direction do not overlap, the first weld mark and the second weld mark are staggered structures, so that the position where the first connecting portion and the second connecting portion are welded to each other and the position where the first connecting portion and the electrode lead portion are welded to each other do not interfere with each other, thereby reducing the influence of the mutual melting of the first weld mark and the second weld mark, and thus facilitating the improvement of the connection quality between the first connecting portion and the second connecting portion and between the first connecting portion and the electrode lead portion.

[0031] In some embodiments, the second weld mark surrounds the outside of the first weld mark.

[0032] In the above technical solution, by surrounding the second weld mark outside the first weld mark, the welding area between the first connecting portion of the current collecting component and the electrode lead portion can be increased, which is beneficial to improving the welding quality between the first connecting portion and the electrode lead portion.

[0033] In some embodiments, the first connecting portion is welded to the second connecting portion to form a first weld mark, and the second connecting portion is welded to the tab to form a third weld mark; wherein, along the first direction, the current collecting member is arranged between the main body and the electrode lead-out portion, and the projections of the first weld mark and the third weld mark in a plane perpendicular to the first direction do not overlap.

[0034] In the above technical solution, by setting the first weld mark and the third weld mark so that their projections in the first direction do not overlap, the first weld mark and the third weld mark are staggered structures, so that the position where the first connection part and the second connection part are welded to each other and the position where the second connection part and the tab are welded to each other do not interfere with each other, so as to reduce the influence of the mutual melting of the first weld mark and the third weld mark, thereby facilitating improving the connection quality between the first connection part and the second connection part and between the second connection part and the tab.

[0035] In some embodiments, the main body is cylindrical.

[0036] In the above technical solution, the main body of the electrode assembly is set to a cylindrical structure to facilitate subsequent processing to form a cylindrical battery cell, so that the battery cell has the advantages of high capacity, long cycle life, and a wide operating temperature range.

[0037] In some embodiments, the housing assembly includes a housing, and the electrode assembly is accommodated in the housing; wherein the housing has a wall portion, and the wall portion is the electrode lead portion.

[0038] In the above technical solution, the shell assembly is provided with a shell. By using the wall of the shell as the electrode lead-out portion, the electrode tab is connected to the wall of the shell through the current collecting component, so that the input or output of the electrical energy of the battery cell can be realized. The structure is simple and easy to assemble.

[0039] In some embodiments, a convex portion is formed on a side of the wall portion facing the electrode assembly, a concave portion is formed on a side of the wall portion facing away from the electrode assembly and corresponding to the position of the convex portion, and the convex portion is connected to the first connecting portion.

[0040] In the above technical solution, a convex portion is formed on one side of the wall facing the electrode assembly, and a corresponding concave portion is formed on the other side, so that the wall has a concave-convex structure formed by stamping, and the electrical connection between the electrode assembly and the wall can be achieved by welding the convex portion of the wall to the first connecting portion of the current collecting component. The wall with such a structure can effectively improve the structural strength of the wall to alleviate the deformation phenomenon when the wall and the first connecting portion are welded to each other, thereby helping to improve the production quality of the battery cell.

[0041] In some embodiments, the housing assembly further comprises a housing, and the electrode assembly is accommodated in the housing; wherein the housing has a wall portion, and the electrode lead portion is insulated and mounted on the wall portion.

[0042] In the above technical solution, the shell assembly is also provided with a shell. By insulating the electrode lead-out part and installing it on the wall of the shell, the input or output of electrical energy of the battery cell can be realized through the electrode lead-out part. The battery cell adopting this structure can reduce the risk of short circuit between the electrode lead-out part and the shell.

[0043] In some embodiments, the outer shell includes a shell and an end cover; a receiving cavity with an opening is formed inside the shell, and the electrode assembly is received in the receiving cavity; the end cover closes the opening; wherein the end cover is the wall portion.

[0044] In the above technical solution, the wall portion of the shell is an end cover for closing the opening of the shell. The battery cell adopting this structure is convenient for assembling the current collecting component, which is beneficial to reducing the difficulty of connecting the current collecting component with the electrode lead-out portion and the current collecting component with the electrode ear, thereby improving the production efficiency of the battery cell.

[0045] 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, one end of the side wall is connected to the wall portion, and the other end of the side wall forms an opening opposite to the wall portion, and the side wall and the wall portion jointly define a accommodating cavity for accommodating the electrode assembly; the end cover closes the opening.

[0046] In the above technical solution, by setting the wall portion as a wall arranged opposite to the shell and the end cover, the battery cell adopting this structure can keep the current collecting member and other components away from the end cover, and there is no direct connection between the wall portion and the end cover, thereby alleviating the phenomenon that the force generated by the pulling or twisting of the electrode lead-out portion by the current collecting member and other components acts on the end cover, thereby reducing the risk of connection failure between the end cover and the shell, and further helping to further reduce the risk of leakage of the battery cell during use.

[0047] In a second aspect, an embodiment of the present application further provides a battery comprising the above-mentioned battery cell.

[0048] In a third aspect, an embodiment of the present application further provides an electrical device comprising the above-mentioned battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] 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.

[0050] FIG1 is a schematic structural diagram of a vehicle provided in some embodiments of the present application;

[0051] FIG2 is an exploded view of the structure of a battery provided in some embodiments of the present application;

[0052] FIG3 is a schematic structural diagram of a battery cell provided in some embodiments of the present application;

[0053] FIG4 is an exploded view of the structure of a battery cell provided in some embodiments of the present application;

[0054] FIG5 is a partial cross-sectional view of a battery cell provided in some embodiments of the present application;

[0055] FIG6 is a partial enlarged view of the battery cell at point A shown in FIG5 ;

[0056] FIG7 is a schematic structural diagram of a current collecting component provided in some embodiments of the present application;

[0057] FIG8 is a cross-sectional view of a current collecting component provided in some embodiments of the present application;

[0058] FIG9 is a cross-sectional view of a current collecting component provided in some other embodiments of the present application;

[0059] FIG10 is a cross-sectional view of a current collecting component provided in some other embodiments of the present application;

[0060] FIG11 is a cross-sectional view of a current collecting component provided in some other embodiments of the present application;

[0061] FIG12 is a partial cross-sectional view of a battery cell provided by some embodiments of the present application in other embodiments;

[0062] FIG13 is a partial cross-sectional view of a battery cell provided in some embodiments of the present application in other embodiments;

[0063] FIG14 is a schematic structural diagram of a battery cell provided in some other embodiments of the present application;

[0064] FIG15 is an exploded view of the structure of a battery cell provided in some other embodiments of the present application;

[0065] FIG16 is a partial cross-sectional view of a battery cell provided in some other embodiments of the present application.

[0066] Icon: 1000-vehicle; 100-battery; 10-casing; 11-first casing body; 12-second casing body; 20-battery cell; 21-housing assembly; 211-electrode lead-out portion; 212-casing; 2121-wall portion; 2121a-convex portion; 2121b-concave portion; 2122-shell; 2122a-opening; 2123-end cover; 22-electrode assembly; 221-main body; 222-ear; 23-current collecting member; 231-first connecting portion; 2311-first through hole; 232-second connecting portion; 2321-connecting area; 2322-second through hole; 233-first weld mark; 24-second weld mark; 25-third weld mark; 200-controller; 300-motor; X-first direction. DETAILED DESCRIPTION

[0067] 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.

[0068] 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.

[0069] 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.

[0070] 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.

[0071] 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.

[0072] 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.

[0073] The term "plurality" used in this application refers to two or more (including two).

[0074] 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.

[0075] 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.

[0076] 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.

[0077] 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.

[0078] 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.

[0079] 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 or stainless steel with a silver surface treatment, 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.).

[0080] 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. 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.

[0081] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0082] As an example, the negative electrode current collector can be a metal foil, a metal foam, or a composite current collector. For example, as the metal foil, aluminum or stainless steel with a silver surface treatment, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, or titanium can be used. The metal foam can be nickel foam, copper foam, aluminum foam, alloy foam, or carbon foam. The composite current collector can include a polymer material base layer and a metal layer. The composite current collector can 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.).

[0083] 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.

[0084] 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.

[0085] As an example, the negative electrode active material may be a negative electrode active material known in the art for use in battery cells. 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, and lithium titanate.

[0086] 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.

[0087] In some embodiments, the electrode assembly further includes a separator disposed between the positive electrode and the negative electrode.

[0088] In some embodiments, the separator is a separator. The present application has no particular limitation on the type of separator, and any known separator with a porous structure having good chemical and mechanical stability can be selected.

[0089] As an example, the main material of the isolation membrane can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramics.

[0090] 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.

[0091] In some embodiments, the battery cell also includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. This application does not specifically limit the type of electrolyte, and the electrolyte can be selected based on needs. The electrolyte can be liquid, gel, or solid.

[0092] 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.

[0093] In some embodiments, the electrode assembly is a laminate structure.

[0094] In some embodiments, the shape of the electrode assembly can be cylindrical, flat, or polygonal.

[0095] 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.

[0096] 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.

[0097] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell or a battery cell of other shapes. The prismatic battery cell includes a square-shell battery cell, a blade-shaped battery cell, and a polygonal battery. The polygonal battery is, for example, a hexagonal battery, etc. There is no special limitation in this application.

[0098] 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.

[0099] 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.

[0100] 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.

[0101] 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.

[0102] In some embodiments, the battery may be an energy storage device, including an energy storage container, an energy storage cabinet, and the like.

[0103] 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 an important component of today's new energy development. However, with the continuous development of battery technology, higher requirements are also being placed on the reliability of battery use.

[0104] For general battery cells, the outer shell of the battery cell usually includes a shell and an end cover. The end cover covers the opening of the shell. In order to facilitate the assembly of the battery cell, especially in battery cells with a cylindrical structure, the end cover is usually used as the power output pole of the battery cell. The electrical connection between the electrode assembly and the end cover can be achieved by welding the electrode lugs of the electrode assembly and the end cover of the shell through the current collecting component arranged in the shell, so as to realize the input or output of electric energy of the battery cell. However, in a battery cell of this structure, the electrode tabs of the electrode assembly are usually made of copper or aluminum, etc., and the current collecting component and the tabs are set to the same material to reduce the difficulty of welding between the tabs and the current collecting component. In order to improve the structural strength of the shell, the shell is usually set to steel, etc., so that the materials of the electrode tabs of the electrode assembly and the end cover of the shell are different. This will lead to different materials between the current collecting component and the end cover, resulting in different melting points and thermal expansion coefficients when the current collecting component and the end cover are welded to each other, thereby causing welding cracks between the current collecting component and the end cover, which makes it very easy for the battery cell to leak electrolyte during use, and then leads to greater safety hazards in the battery cell during use, which is not conducive to the reliability of the battery cell.

[0105] Based on the above considerations, in order to solve the problem of low reliability of battery cells during use, an embodiment of the present application provides a battery cell, which includes a housing assembly, an electrode assembly and a current collecting component. The housing assembly includes an electrode lead-out portion for inputting or outputting electrical energy. The electrode assembly is accommodated in the housing assembly, and the electrode assembly includes a main body and a tab, the tab is connected to the main body, and the tab and the electrode lead-out portion are made of different materials. The current collecting component is arranged in the housing assembly, and the current collecting component includes a first connecting portion made of the same material as the electrode lead-out portion and a second connecting portion made of the same material as the tab, the first connecting portion is connected to the second connecting portion, the first connecting portion is welded to the electrode lead-out portion, and the second connecting portion is welded to the tab.

[0106] In a battery cell of this structure, the current collecting member is provided with a first connecting portion and a second connecting portion that are interconnected. The first connecting portion is welded to the electrode lead portion, and the second connecting portion is welded to the tab, thereby achieving electrical connection between the electrode assembly and the electrode lead portion, thereby enabling input or output of electrical energy into or out of the battery cell. By setting the material of the first connecting portion to be the same as the material of the electrode lead portion of the housing assembly, and setting the material of the second connecting portion to be the same as the material of the tab, the battery cell of this structure facilitates welding of the current collecting member to the electrode lead portion and vice versa, thereby reducing the difficulty of assembling the current collecting member to the electrode lead portion of the housing assembly and between the current collecting member and the tab of the electrode assembly, thereby improving battery cell assembly efficiency. Furthermore, the current collecting member and the electrode lead portion of the housing assembly can be welded together using the same material, thereby alleviating the differences in melting points and thermal expansion coefficients caused by welding the current collecting member and the electrode lead portion made of different materials. This reduces the occurrence of welding cracks between the current collecting member and the electrode lead portion, thereby reducing the risk of battery cell leakage and effectively improving battery cell reliability.

[0107] 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 can help alleviate the problem of electrolyte leakage during battery cell use and improve the reliability of the battery cells.

[0108] 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.

[0109] For the convenience of description, the following embodiments are described by taking a vehicle 1000 as an example of an electrical device according to an embodiment of the present application.

[0110] 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.

[0111] 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.

[0112] 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 .

[0113] The housing 10 is used to provide assembly space for the battery cells 20 and can have various 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 overlap each other, and the first housing body 11 and the second housing body 12 together define an assembly space for accommodating the battery cells 20. The second housing body 12 can be a hollow structure with one end open. The first housing body 11 can be a plate-like structure, and the first housing body 11 overlaps 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, with the open side of the first housing body 11 overlapping the open side of the second housing body 12. Of course, the housing 10 formed by the first housing body 11 and the second housing body 12 can have various shapes, such as a cylinder, a rectangular parallelepiped, etc. For example, in Figure 2, the housing 10 is in the shape of a rectangular parallelepiped.

[0114] In the battery 100, the number of battery cells 20 disposed in the housing 10 may be one or more. When there are multiple battery cells 20 disposed in the housing 10, the multiple battery cells 20 may be connected in series, in parallel, or in a mixed connection. Mixed connection means that the multiple battery cells 20 are connected in series and in parallel. The multiple battery cells 20 may be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by the multiple battery cells 20 may be accommodated in the housing 10. Of course, the battery 100 may also be a battery module formed by first connecting multiple battery cells 20 in series, in parallel, or in a mixed connection, and then the multiple battery modules may be connected in series, in parallel, or in a mixed connection to form a whole, and then accommodated in the housing 10. The battery 100 may also include other structures. For example, the battery 100 may also include a busbar component, which is used to connect the multiple battery cells 20 to achieve electrical connection between the multiple battery cells 20.

[0115] 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 cylindrical, flat, rectangular, or in other shapes. For example, in FIG3 , the battery cell 20 is cylindrical.

[0116] According to some embodiments of the present application, with reference to FIG3 , and further with reference to FIG4 , FIG5 and FIG6 , FIG4 is a structural exploded view 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, and FIG6 is a partial enlarged view of point A of the battery cell 20 shown in FIG5 . The present application provides a battery cell 20, which includes a housing assembly 21, an electrode assembly 22 and a current collecting member 23. The housing assembly 21 includes an electrode lead-out portion 211 for inputting or outputting electrical energy. The electrode assembly 22 is housed in the housing assembly 21, and the electrode assembly 22 includes a main body 221 and a tab 222. The tab 222 is connected to the main body 221, and the tab 222 is made of a different material from the electrode lead-out portion 211. The current collecting component 23 is arranged in the shell assembly 21, and the current collecting component 23 includes a first connecting portion 231 made of the same material as the electrode lead-out portion 211 and a second connecting portion 232 made of the same material as the pole tab 222. The first connecting portion 231 is connected to the second connecting portion 232, and the first connecting portion 231 is welded to the electrode lead-out portion 211, and the second connecting portion 232 is welded to the pole tab 222.

[0117] The housing assembly 21 includes a housing 212, which houses the electrode assembly 22 and the current collecting member 23. The housing 212 can also contain an electrolyte, such as an electrolyte solution. The housing 212 can have various structural forms, such as a cylinder or a rectangular parallelepiped. Similarly, the housing 212 can be made of a variety of materials, such as copper, iron, aluminum, steel, or an aluminum alloy.

[0118] The housing assembly 21 includes an electrode lead portion 211 for inputting or outputting electrical energy. The electrode lead portion 211 is electrically connected to the tab 222 of the electrode assembly 22, thereby outputting or inputting electrical energy from the battery cell 20. The electrode lead portion 211 can output the positive electrode of the battery cell 20, that is, the electrode lead portion 211 is the positive output electrode of the battery cell 20, or it can output the negative electrode of the battery cell 20, that is, the electrode lead portion 211 is the negative output electrode of the battery cell 20. Similarly, the electrode lead portion 211 can have various structures. The electrode lead portion 211 can be a wall portion 2121 of the housing 212, or it can be an electrode terminal mounted on the wall portion 2121 of the housing 212. For example, in Figures 4 and 5, the electrode lead portion 211 is a wall portion 2121 of the housing 212.

[0119] In some embodiments, the outer shell 212 may include a shell 2122 and an end cover 2123, and a accommodating cavity is formed inside the shell 2122, which is used to accommodate the electrode assembly 22, and the accommodating cavity has an opening 2122a, that is, the shell 2122 is a hollow structure with an opening 2122a at one end, and the end cover 2123 covers the opening 2122a of the shell 2122 and forms a sealed connection to form a sealed space for accommodating the electrode assembly 22 and the electrolyte.

[0120] When assembling the battery cell 20 , the electrode assembly 22 may be placed in the housing 2122 first, and the housing 2122 may be filled with electrolyte. The end cap 2123 may then be placed on the opening 2122 a of the housing 2122 to complete the assembly of the battery cell 20 .

[0121] It should be noted that the wall portion 2121 for mounting the electrode lead portion 211 or the wall portion 2121 serving as the electrode lead portion 211 may be the end cap 2123 or a wall of the housing 2122. For example, in Figures 4 and 5 , the wall portion 2121 is the end cap 2123. Of course, the structure of the battery cell 20 is not limited thereto. In other embodiments, the wall portion 2121 may be the bottom wall of the housing 2122 disposed opposite the end cap 2123, or the side wall of the housing 2122 and the end cap 2123 adjacent to and abutting against each other.

[0122] It should be noted that, when the electrode lead-out portion 211 is an electrode terminal mounted on the wall portion 2121 of the outer shell 212, the electrode lead-out portion 211 is insulated and mounted on the outer shell 212, and the output pole of the battery cell 20 with opposite polarity to the electrode lead-out portion 211 may be the shell 2122 of the outer shell 212, or the end cover 2123 of the outer shell 212; when the electrode lead-out portion 211 is the shell 2122 of the outer shell 212, the output pole of the battery cell 20 with opposite polarity to the electrode lead-out portion 211 may be the electrode terminal insulated and mounted on the wall portion 2121 of the outer shell 212, or the end cover 2123 insulated and connected to the shell 2122; when the electrode lead-out portion 211 is the end cover 2123 of the outer shell 212, the output pole of the battery cell 20 with opposite polarity to the electrode lead-out portion 211 may be the electrode terminal insulated and mounted on the wall portion 2121 of the outer shell 212, or the shell 2122 insulated and connected to the end cover 2123.

[0123] The housing 2122 can have a variety of shapes, such as a cylinder, a rectangular parallelepiped, or a prismatic structure. The shape of the housing 2122 can be determined based on the specific shape of the electrode assembly 22. For example, if the electrode assembly 22 has a cylindrical structure, a cylindrical housing 2122 can be selected; if the electrode assembly 22 has a rectangular parallelepiped structure, a rectangular housing 2122 can be selected. Of course, the structure of the end cap 2123 can also be various, such as a plate-like structure or a hollow structure with one end open. For example, in Figure 3, the housing 2122 has a cylindrical structure.

[0124] Of course, it is understandable that the shell 212 is not limited to the above structure. The shell 212 may also be other structures. For example, the shell 212 may include a shell body 2122 and two end covers 2123. The shell body 2122 is a hollow structure with openings 2122a on opposite sides. One end cover 2123 corresponds to an opening 2122a of the shell body 2122 and forms a sealed connection to form a sealed space for accommodating the electrode assembly 22 and the electrolyte. That is, the shell body 2122 is formed with openings 2122a on opposite sides, and the two end covers 2123 are respectively covered on both sides of the shell body 2122 to close the corresponding openings 2122a.

[0125] The electrode assembly 22 is the component in the battery cell 20 where the electrochemical reaction occurs. The main body 221 of the electrode assembly 22 may include a positive electrode sheet, a negative electrode sheet, and a separator. The electrode assembly 22 may have various structures. For example, the main body 221 of the electrode assembly 22 may be a wound structure formed by winding the positive electrode sheet, separator, and negative electrode sheet, or a stacked structure formed by stacking the positive electrode sheet, separator, and negative electrode sheet. The tabs 222 of the electrode assembly 22 are components formed by stacking and connecting regions of the positive electrode sheet that are not coated with the positive electrode active material layer, or by stacking and connecting regions of the negative electrode sheet that are not coated with the negative electrode active material layer.

[0126] For example, in FIG4 , the main body 221 of the electrode assembly 22 is a wound structure formed by winding a positive electrode sheet, a separator, and a negative electrode sheet, and the main body 221 of the electrode assembly 22 is cylindrical.

[0127] Each electrode assembly 22 has two tabs 222, which are used to output or input the positive and negative electrodes of the electrode assembly 22, respectively. If the tabs 222 are used to output the positive electrode of the electrode assembly 22, the tabs 222 are formed by stacking and connecting the areas of the positive electrode sheet that are not coated with the positive electrode active material layer; if the tabs 222 are used to output the negative electrode of the electrode assembly 22, the tabs 222 are formed by stacking and connecting the areas of the negative electrode sheet that are not coated with the negative electrode active material layer.

[0128] The tab 222 is made of a different material than the electrode lead portion 211. The tab 222 can be made of a variety of materials, such as copper or aluminum. If the tab 222 is a positive tab, the tab 222 is typically made of aluminum; if the tab 222 is a negative tab, the tab 222 is typically made of copper. It should be noted that the difference in material between the tab 222 and the electrode lead-out portion 211 means that the main component of the tab 222 is different from the main component of the electrode lead-out portion 211. For example, if the tab 222 and the electrode lead-out portion 211 are both made of a single material, such as copper or aluminum, then the material of the tab 222 and the electrode lead-out portion 211 is composed of different metal elements; if the tab 222 and the electrode lead-out portion 211 are made of an alloy material or a mixed material, such as aluminum alloy or steel, then the difference in material between the tab 222 and the electrode lead-out portion 211 means that the main components of the tab 222 and the electrode lead-out portion 211 are different, and does not simply mean that the content of the components is different.

[0129] The current collecting component 23 includes a first connecting portion 231 made of the same material as the electrode lead-out portion 211 and a second connecting portion 232 made of the same material as the electrode tab 222. The first connecting portion 231 is connected to the second connecting portion 232, that is, the current collecting component 23 has a first connecting portion 231 and a second connecting portion 232 of different materials that are connected to each other so that an electrical connection is formed between the first connecting portion 231 and the second connecting portion 232.

[0130] Optionally, the electrode lead portion 211 can be made of a variety of materials, such as copper, iron, aluminum, steel, or an aluminum alloy. For example, in Figures 5 and 6 , the electrode lead portion 211 is a wall portion 2121 of the outer shell 212, which can be made of steel. Accordingly, the first connection portion 231 of the current collecting member 23 is made of the same material as the outer shell 212, i.e., the first connection portion 231 of the current collecting member 23 is also made of steel. Similarly, if the tab 222 is a positive tab 222, the tab 222 is typically made of aluminum, and the corresponding second connection portion 232 of the current collecting member 23 is also made of aluminum. If the tab 222 is a negative tab 222, the tab 222 is typically made of copper, and the corresponding second connection portion 232 of the current collecting member 23 is also made of copper.

[0131] It should be noted that the electrode lead-out part 211 and the first connecting part 231 are of the same material, which means that the main component of the electrode lead-out part 211 is the same as the main component of the first connecting part 231. For example, the electrode lead-out part 211 and the first connecting part 231 are both made of a single material, such as copper or aluminum, then the electrode lead-out part 211 and the first connecting part 231 are composed of the same metal element; if the electrode lead-out part 211 and the first connecting part 231 are made of an alloy material or a mixed material, such as aluminum alloy or steel, then the material difference between the electrode lead-out part 211 and the first connecting part 231 means that the main component of the electrode lead-out part 211 and the first connecting part 231 is the same. If the electrode lead-out part 211 and the first connecting part 231 are only different in the content of the component, then they are also made of the same material. For example, low carbon steel, medium carbon steel and high carbon steel are all made of the same material. Similarly, the same material of the tab 222 and the second connecting part 232 means that the main component of the tab 222 is the same as the main component of the second connecting part 232. For example, the tab 222 and the second connecting part 232 are both made of a single material, such as copper or aluminum, and the tab 222 and the second connecting part 232 are composed of the same metal element; if the tab 222 and the second connecting part 232 are alloy materials or mixed materials, such as aluminum alloy or steel, the different materials of the tab 222 and the second connecting part 232 means that the main component of the tab 222 and the second connecting part 232 is the same. If the tab 222 and the second connecting part 232 are only different in the content of the components, they are also the same material. For example, low carbon steel, medium carbon steel and high carbon steel are all the same material.

[0132] Optionally, the first connection portion 231 and the second connection portion 232 of the current collecting member 23 can be connected in various ways, such as by clamping, bolting, laser welding, plating, friction welding, or ultrasonic welding. With this structure of the current collecting member 23, even if the first connection portion 231 and the second connection portion 232 are made of different materials and welded together, which would result in a weld crack, the weld crack between the first connection portion 231 and the second connection portion 232 is located within the housing 212 of the housing assembly 21 and will not affect the housing 212, thereby mitigating the risk of leakage.

[0133] In some embodiments, the battery cell 20 may also include a pressure relief mechanism, which is installed on the outer shell 212. Optionally, the pressure relief mechanism can be set on the end cover 2123 or on the shell 2122. The pressure relief mechanism is used to release the pressure inside the battery cell 20 when the internal pressure or temperature of the battery cell 20 reaches a predetermined value.

[0134] Illustratively, 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.

[0135] By setting the current collecting member 23 as a first connecting portion 231 and a second connecting portion 232 connected to each other, the first connecting portion 231 is welded to the electrode lead-out portion 211, and the second connecting portion 232 is welded to the pole ear 222 to achieve electrical connection between the electrode assembly 22 and the electrode lead-out portion 211, thereby enabling the input or output of electrical energy of the battery cell 20. By setting the material of the first connecting portion 231 to be the same as the material of the electrode lead-out portion 211 of the shell assembly 21, and setting the material of the second connecting portion 232 to be the same as the material of the pole ear 222, the battery cell 20 of this structure is convenient for the current collecting member 23 to be connected to the electrode lead-out portion 211 and the current collecting member 23 to be connected to the pole ear 222. Welding connection is beneficial to reducing the difficulty of assembly between the current collecting component 23 and the electrode lead-out portion 211 of the shell assembly 21, and between the current collecting component 23 and the electrode ear 222 of the electrode assembly 22, so as to improve the assembly efficiency of the battery cell 20. On the other hand, it can realize the mutual welding of the current collecting component 23 and the electrode lead-out portion 211 of the shell assembly 21 with the same material, so as to alleviate the phenomenon of different melting points and thermal expansion coefficients caused by welding the current collecting component 23 and the electrode lead-out portion 211 due to different materials, thereby reducing the phenomenon of welding cracks between the current collecting component 23 and the electrode lead-out portion 211, which is beneficial to reducing the risk of leakage of the battery cell 20, and thus can effectively improve the reliability of the battery cell 20.

[0136] According to some embodiments of the present application, referring to Figures 5 and 6, and further referring to Figures 7 and 8, Figure 7 is a schematic structural diagram of a current collecting member 23 provided in some embodiments of the present application, and Figure 8 is a cross-sectional view of a current collecting member 23 provided in some embodiments of the present application. Along a first direction X, the current collecting member 23 is disposed between the main body 221 and the electrode lead portion 211. Along the first direction X, the first connecting portion 231 and the second connecting portion 232 are stacked, with the first connecting portion 231 located on the side of the second connecting portion 232 facing the electrode lead portion 211.

[0137] The current collecting member 23 is disposed between the main body 221 and the electrode lead portion 211 along the first direction X. That is, the main body 221 and the electrode lead portion 211 are arranged along the first direction X, and the current collecting member 23 is located between the main body 221 and the electrode lead portion 211 .

[0138] The first connection portion 231 is located on a side of the second connection portion 232 facing the electrode lead portion 211 . That is, in the first direction X, the first connection portion 231 is closer to the electrode lead portion 211 than the second connection portion 232 .

[0139] By stacking the first connection portion 231 and the second connection portion 232 of the current collecting component 23 between the main body 221 and the electrode lead-out portion 211 along the first direction X, and the first connection portion 231 facing the electrode lead-out portion 211, it is convenient to weld the first connection portion 231 of the current collecting component 23 and the electrode lead-out portion 211 of the shell assembly 21 to each other, which is beneficial to reducing the assembly difficulty between the current collecting component 23 and the electrode lead-out portion 211, thereby improving the assembly efficiency of the battery cell 20.

[0140] In some embodiments, referring to FIG. 5 and FIG. 6 , along the first direction X, the tab 222 is disposed on a side of the main body 221 facing the second connection portion 232 .

[0141] Among them, the pole ear 222 is arranged on the side of the main body 221 facing the second connecting part 232, that is, the pole ear 222 is connected to one end of the main body 221 close to the electrode lead-out part 211 in the first direction X, that is, the electrode assembly 22 is formed with a pole ear 222 at one end close to the electrode lead-out part 211 in the first direction X, so that the pole ear 222 is located between the main body 221 and the second connecting part 232 in the first direction X.

[0142] By setting the pole tab 222 to be located on the side of the main body 221 facing the second connecting portion 232 in the first direction X, the pole tab 222 and the second connecting portion 232 are arranged facing each other in the first direction X, thereby facilitating the welding of the second connecting portion of the current collecting component 23 and the pole tab 222 of the electrode assembly 22, which is beneficial to reducing the difficulty of assembly between the current collecting component 23 and the pole tab 222.

[0143] According to some embodiments of the present application, as shown in FIG. 6 , FIG. 7 and FIG. 8 , along the first direction X, the second connection portion 232 has a connection area 2321 not covered by the first connection portion 231 , and the connection area 2321 is welded to the tab 222 .

[0144] The second connection part 232 has a connection area 2321 not covered by the first connection part 231, that is, in the first direction X, the first connection part 231 only covers a part of the second connection part 232, and the part of the second connection part 232 not covered by the first connection part 231 is used for welding with the tab 222.

[0145] It should be noted that the structure of the connection area 2321 formed on the second connection part 232 of the current collecting component 23 that is not covered by the first connection part 231 can be diverse. For example, a through hole can be set on the first connection to avoid the second connection part 232, or the size of the first connection part 231 can be set to be smaller than the size of the second connection part 232.

[0146] The area of ​​the second connection part 232 that is not covered by the first connection part 231 in the first direction X forms a connection area 2321 that is welded to the pole lug 222, that is, the area of ​​the second connection part 232 used for welding to the pole lug 222 is not blocked by the first connection part 231, so that when the second connection part 232 and the pole lug 222 are welded to each other, the welding heat only needs to pass through the connection area 2321 of the second connection part 232 to complete the welding connection between the first connection part 231 and the pole lug 222, thereby reducing the welding difficulty between the current collecting component 23 and the pole lug 222 on the one hand, and on the other hand, the welding heat does not need to pass through the first connection part 231 before welding the first connection part 231 and the pole lug 222, shortening the transfer path of the welding heat, which is beneficial to improving the welding quality and welding efficiency between the first connection part 231 and the pole lug 222.

[0147] According to some embodiments of the present application, referring to Figures 6, 7 and 8, the first connection portion 231 is provided with a first through hole 2311, the first through hole 2311 passes through both sides of the first connection portion 231 in the first direction X, and the second connection portion 232 forms a connection area 2321 corresponding to the area of ​​the first through hole 2311.

[0148] Illustratively, the first through hole 2311 extends along the first direction X and penetrates both sides of the first connecting portion 231, such that the first connecting portion 231 avoids the second connecting portion 232 in the first direction X, thereby forming a connection area 2321 on the second connecting portion 232 that is not covered by the first connecting portion 231. Of course, in other embodiments, the extension direction of the first through hole 2311 may also be approximately the first direction X, that is, an angle is formed between the extension direction of the first through hole 2311 and the first direction X.

[0149] By setting a first through hole 2311 on both sides of the first connecting part 231, the second connecting part 232 is avoided through the first through hole 2311, so that the second connecting part 232 has a connection area 2321 not covered by the first connecting part 231. The structure is simple and easy to implement.

[0150] In some embodiments, please continue to refer to Figures 6, 7 and 8, the connection area 2321 is provided with a second through hole 2322 connected to the first through hole 2311, the second through hole 2322 passes through both sides of the second connection part 232 in the first direction X, and the aperture of the second through hole 2322 is smaller than the aperture of the first through hole 2311.

[0151] Exemplarily, the second through hole 2322 extends along the first direction X and passes through both sides of the second connecting portion 232. Of course, in other embodiments, the extension direction of the second through hole 2322 may also be approximately the first direction X, that is, an angle is formed between the extension direction of the second through hole 2322 and the first direction X.

[0152] Optionally, the first through hole 2311 and the second through hole 2322 may be coaxially arranged or non-coaxially arranged. For example, in FIG. 8 , the first through hole 2311 and the second through hole 2322 are coaxially arranged.

[0153] It should be noted that the second connecting portion 232 forms a connecting area 2321 corresponding to the position of the first through hole 2311, and the area of ​​the connecting area 2321 where the second through hole 2322 is not provided is used for welding connection with the tab 222 to achieve electrical connection between the second connecting portion 232 and the tab 222.

[0154] By providing a second through hole 2322 in communication with the first through hole 2311 on the connection region 2321 of the second connection portion 232, the first through hole 2311 and the second through hole 2322 cooperate to form a passage for electrolyte to pass through, allowing the electrolyte to enter the electrode assembly 22 after passing through the first through hole 2311 and the second through hole 2322. This helps improve the wetting effect of the electrode assembly 22 and, in turn, improves the performance of the battery cell 20. Furthermore, by setting the aperture of the second through hole 2322 to be smaller than the aperture of the first through hole 2311, the area of ​​the connection region 2321 not provided with the second through hole 2322 can be welded to the tab 222, facilitating welding of the second connection portion 232 to the tab 222.

[0155] 8 , the outer circumference of the first connection portion 231 is flush with the outer circumference of the second connection portion 232 . In other words, the edge of the first connection portion 231 is flush with the edge of the second connection portion 232 .

[0156] Exemplarily, the first connection portion 231 and the second connection portion 232 are both disc structures, that is, the first connection portion 231 and the second connection portion 232 are coaxially arranged and have the same radius.

[0157] By setting the outer peripheral surface of the first connecting part 231 and the outer peripheral surface of the second connecting part 232 to be flush with each other, the structure of the current collecting component 23 is made more regular, which facilitates the installation of the current collecting component 23 and the welding connection between the current collecting component 23 and the electrode lead-out part 211 and the tab 222, and can reduce the risk of interference between the current collecting component 23 and other structures of the battery cell 20.

[0158] According to some embodiments of the present application, referring to FIG9 , which is a cross-sectional view of a current collecting member 23 provided in yet other embodiments of the present application, the connection region 2321 surrounds the outer side of the projection of the first connection portion 231 on the second connection portion 232 along the first direction X.

[0159] Among them, the connection area 2321 surrounds the outside of the projection of the first connection part 231 on the second connection part 232 along the first direction X, that is, the edge of the second connection part 232 is a structure that exceeds the edge of the first connection part 231, so that the area of ​​the second connection part 232 located between the outer peripheral surface of the second connection part 232 and the outer peripheral surface of the first connection part 231 in the radial direction of the second connection part 232 is the connection area 2321 for welding connection with the tab 222.

[0160] Exemplarily, the first connection part 231 and the second connection part 232 are both disc structures, and the first connection part 231 and the second connection part 232 are coaxially arranged, that is, the radius of the first connection part 231 is smaller than the radius of the second connection part 232, so that the second connection part 232 exceeds the area of ​​the first connection part 231 in the radial direction of the second connection part 232 to form a connection area 2321.

[0161] By setting the connection area 2321 to surround the outside of the projection of the first connection part 231 on the second connection part 232 along the first direction X, the current collecting component 23 is configured to have a structure in which the edge of the second connection part 232 exceeds the edge of the first connection part 231, so that the first connection part 231 avoids the second connection part 232, thereby realizing that the second connection part 232 has a connection area 2321 that is not covered by the first connection part 231. The structure is simple and easy to implement.

[0162] In some embodiments, as shown in Figure 9, the first connection part 231 is provided with a first through hole 2311, and the first through hole 2311 passes through both sides of the first connection part 231 in the first direction X. The second connection part 232 is provided with a second through hole 2322, and the second through hole 2322 passes through both sides of the second connection part 232 in the first direction X. The first through hole 2311 is connected to the second through hole 2322.

[0163] Exemplarily, the first through hole 2311 extends along the first direction X and passes through both sides of the first connecting portion 231. Of course, in other embodiments, the extension direction of the first through hole 2311 may also be approximately the first direction X, that is, an angle is formed between the extension direction of the first through hole 2311 and the first direction X.

[0164] Exemplarily, the second through hole 2322 extends along the first direction X and passes through both sides of the second connecting portion 232. Of course, in other embodiments, the extension direction of the second through hole 2322 may also be approximately the first direction X, that is, an angle is formed between the extension direction of the second through hole 2322 and the first direction X.

[0165] The first through hole 2311 is connected to the second through hole 2322 , that is, the projections of the first through hole 2311 and the second through hole 2322 in the first direction X have overlapping areas.

[0166] By setting a first through hole 2311 on the first connecting portion 231 and a second through hole 2322 on the second connecting portion 232, and the first through hole 2311 and the second through hole 2322 are connected to each other, the first through hole 2311 and the second through hole 2322 can cooperate to form a channel for electrolyte to pass through, so that the electrolyte can enter the electrode assembly 22 after passing through the first through hole 2311 and the second through hole 2322, which is beneficial to improving the wetting effect of the electrode assembly 22, and further improving the performance of the battery cell 20.

[0167] In some embodiments, referring to FIG. 9 , the first through hole 2311 and the second through hole 2322 are coaxially arranged and have the same radius. That is, the central axis of the first through hole 2311 and the central axis of the second through hole 2322 coincide with each other, that is, the projections of the first through hole 2311 and the second through hole 2322 in the first direction X completely coincide with each other.

[0168] By setting the first through hole 2311 and the second through hole 2322 to be coaxial and of equal radius, the first through hole 2311 and the second through hole 2322 can be respectively processed on the first connection part 231 and the second connection part 232 after the first connection part 231 and the second connection part 232 are stacked on each other. There is no need to process the first through hole 2311 and the second through hole 2322 on the first connection part 231 and the second connection part 232 respectively and then stack the first connection part 231 and the second connection part 232 on each other. This can optimize the processing technology and production rhythm of the current collecting component 23, reduce the processing difficulty, and help improve the production efficiency of the current collecting component 23.

[0169] According to some embodiments of the present application, referring to FIG. 7 , FIG. 8 and FIG. 9 , the first connection portion 231 and the second connection portion 232 are both disc structures, and the first connection portion 231 and the second connection portion 232 are coaxially arranged.

[0170] The first connection portion 231 and the second connection portion 232 are coaxially arranged, that is, the central axis of the first connection portion 231 and the central axis of the second connection portion 232 coincide with each other.

[0171] By setting the first connecting part 231 and the second connecting part 232 as coaxial structures, the structure of the current collecting component 23 is made more regular, which facilitates the installation of the current collecting component 23 and helps save the space occupied by the current collecting component 23 in the shell assembly 21, thereby improving the internal space utilization of the battery cell 20.

[0172] According to some embodiments of the present application, referring to FIG10 , FIG10 is a cross-sectional view of a current collecting member 23 provided in still further embodiments of the present application. Along a first direction X, the current collecting member 23 is disposed between the main body 221 and the electrode lead portion 211. The first connecting portion 231 surrounds the outer side of the second connecting portion 232, and the inner circumference of the first connecting portion 231 is connected to the outer circumference of the second connecting portion 232.

[0173] The inner circumference of the first connection portion 231 and the outer circumference of the second connection portion 232 are in contact with each other and are welded together.

[0174] Exemplarily, the first connecting portion 231 and the second connecting portion 232 are both annular structures.

[0175] It should be noted that in some embodiments, the current collecting member 23 may also have other structures. Referring to Figure 11, which is a cross-sectional view of the current collecting member 23 provided in other embodiments of the present application, the second connecting portion 232 surrounds the outer side of the first connecting portion 231, and the inner circumference of the second connecting portion 232 is connected to the outer circumference of the first connecting portion 231.

[0176] By arranging the first connection part 231 and the second connection part 232 of the current collecting component 23 to be a structure that surrounds each other, that is, the first connection part 231 surrounds the outside of the second connection part 232, or the second connection part 232 surrounds the outside of the first connection part 231, the current collecting component 23 adopting this structure can save the space occupied by the current collecting component 23 in the first direction X, thereby effectively improving the internal space utilization of the battery cell 20, thereby improving the energy density of the battery cell 20.

[0177] According to some embodiments of the present application, as shown in Figures 5 and 6, the first connection portion 231 and the second connection portion 232 are welded to form a first weld mark 233, and the first connection portion 231 and the electrode lead portion 211 are welded to form a second weld mark 24. Along the first direction X, the current collecting member 23 is disposed between the main body 221 and the electrode lead portion 211, and the projections of the first weld mark 233 and the second weld mark 24 on a plane perpendicular to the first direction X do not overlap.

[0178] Among them, the projections of the first weld mark 233 and the second weld mark 24 in the plane perpendicular to the first direction X do not overlap, that is, the projection of the first weld mark 233 in the first direction X and the projection of the second weld mark 24 in the first direction X do not intersect with each other, that is, the projection of the first weld mark 233 in the plane perpendicular to the first direction X and the projection of the second weld mark 24 in the plane perpendicular to the first direction X are arranged at intervals.

[0179] For example, in FIG. 6 , the first weld mark 233 surrounds the outside of the second weld mark 24 .

[0180] It should be noted that, in an embodiment where the first connection portion 231 surrounds the outside of the second connection portion 232 or the second connection portion 232 surrounds the outside of the first connection portion 231, the first weld mark 233 is formed in the area where the first connection portion 231 and the second connection portion 232 abut each other, and the projections of the first weld mark 233 and the second weld mark 24 in a plane perpendicular to the first direction X do not overlap, that is, in the radial direction of the first connection portion 231, the first weld mark 233 and the second weld mark 24 are spaced apart.

[0181] By arranging the first weld mark 233 and the second weld mark 24 so that their projections in the first direction X do not overlap, the first weld mark 233 and the second weld mark 24 are staggered structures, so that the position where the first connection part 231 and the second connection part 232 are welded to each other and the position where the first connection part 231 and the electrode lead part 211 are welded to each other do not interfere with each other, thereby reducing the influence of the mutual melting of the first weld mark 233 and the second weld mark 24, which is beneficial to improving the connection quality between the first connection part 231 and the second connection part 232 and between the first connection part 231 and the electrode lead part 211.

[0182] Of course, the structure of the battery cell 20 is not limited to this. In some embodiments, please refer to Figure 12, which is a partial cross-sectional view of the battery cell 20 provided in some embodiments of the present application. The second weld mark 24 can also surround the outside of the first weld mark 233. It should be noted that the second weld mark 24 surrounds the outside of the first weld mark 233. The second weld mark 24 can be a continuous ring structure surrounding the outside of the first weld mark 233 and connected end to end, or it can be a discontinuous ring structure surrounding the outside of the first weld mark 233.

[0183] By surrounding the second weld mark 24 outside the first weld mark 233 , the welding area between the first connection portion 231 of the current collecting member 23 and the electrode lead portion 211 can be increased, which is beneficial to improving the welding quality between the first connection portion 231 and the electrode lead portion 211 .

[0184] According to some embodiments of the present application, as shown in Figures 5 and 6, the first connection portion 231 and the second connection portion 232 are welded together to form a first weld mark 233, and the second connection portion 232 and the electrode tab 222 are welded together to form a third weld mark 25. Along the first direction X, the current collecting member 23 is disposed between the main body 221 and the electrode lead portion 211, and the projections of the first weld mark 233 and the third weld mark 25 in a plane perpendicular to the first direction X do not overlap.

[0185] Among them, the projections of the first weld mark 233 and the third weld mark 25 in the plane perpendicular to the first direction X do not overlap, that is, the projection of the first weld mark 233 in the first direction X and the projection of the third weld mark 25 in the first direction X do not intersect with each other, that is, the projection of the first weld mark 233 in the plane perpendicular to the first direction X and the projection of the third weld mark 25 in the plane perpendicular to the first direction X are arranged at intervals.

[0186] For example, FIG6 shows an embodiment in which the second connection portion 232 forms a connection area 2321 in the area corresponding to the first through-hole 2311. The second weld mark 24 is located between the first weld mark 233 and the third weld mark 25 in the radial direction of the current collecting member 23. Of course, in an embodiment in which the second weld mark 24 surrounds the first weld mark 233, the first weld mark 233 is located between the second weld mark 24 and the third weld mark 25 in the radial direction of the current collecting member 23. It should be noted that in an embodiment in which the connection area 2321 surrounds the outside of the projection of the first connection portion 231 on the second connection portion 232 along the first direction X, the third weld mark 25 surrounds the outside of the first weld mark 233 and the second weld mark 24. In this structure, the first weld mark 233 can be located between the third weld mark 25 and the second weld mark 24 in the radial direction of the current collecting member 23, or the second weld mark 24 can be located between the third weld mark 25 and the first weld mark 233 in the radial direction of the current collecting member 23. It should be noted that the third weld mark 25 surrounds the outside of the first weld mark 233 and the second weld mark 24. The third weld mark 25 can be a continuous annular structure that surrounds the outside of the first weld mark 233 and the second weld mark 24 and is connected end to end, or it can be an intermittent annular structure that surrounds the outside of the first weld mark 233 and the second weld mark 24.

[0187] It should be noted that, in an embodiment in which the first connection portion 231 surrounds the outside of the second connection portion 232 or the second connection portion 232 surrounds the outside of the first connection portion 231, the first weld mark 233 is formed in the area where the first connection portion 231 and the second connection portion 232 abut each other, and the projections of the first weld mark 233 and the third weld mark 25 in a plane perpendicular to the first direction X do not overlap, that is, in the radial direction of the first connection portion 231, the first weld mark 233 and the third weld mark 25 are spaced apart.

[0188] By arranging the first weld mark 233 and the third weld mark 25 so that their projections in the first direction X do not overlap, the first weld mark 233 and the third weld mark 25 are staggered structures, so that the position where the first connection part 231 and the second connection part 232 are welded to each other and the position where the second connection part 232 and the tab 222 are welded to each other do not interfere with each other, thereby reducing the influence of the mutual melting of the first weld mark 233 and the third weld mark 25, which is beneficial to improving the connection quality between the first connection part 231 and the second connection part 232 and between the second connection part 232 and the tab 222.

[0189] According to some embodiments of the present application, as shown in FIG. 4 and FIG. 5 , the main body 221 is cylindrical.

[0190] The central axis of the main body 221 extends along the first direction X.

[0191] By setting the main body 221 of the electrode assembly 22 to a cylindrical structure, it is convenient to form a cylindrical battery cell 20 in subsequent processing, so that the battery cell 20 has the advantages of high capacity, long cycle life, and a wide operating temperature range.

[0192] According to some embodiments of the present application, referring to FIG3 , FIG4 , FIG5 and FIG6 , the housing assembly 21 includes a housing 212 , the electrode assembly 22 is accommodated in the housing 212 , and the housing 212 has a wall portion 2121 , which is the electrode lead-out portion 211 .

[0193] The wall portion 2121 is the electrode lead-out portion 211 , that is, the first connection portion 231 of the current collecting member 23 is welded to a wall of the housing 212 to achieve input or output of electrical energy of the battery cell 20 .

[0194] The shell assembly 21 is provided with a shell 212. By using the wall 2121 of the shell 212 as the electrode lead-out portion 211, the pole ear 222 is connected to the wall 2121 of the shell 212 through the current collecting component 23, so that the input or output of electrical energy of the battery cell 20 can be realized. The structure is simple and easy to assemble.

[0195] In some embodiments, as shown in Figures 5 and 6, a convex portion 2121a is formed on the side of the wall portion 2121 facing the electrode assembly 22, and a concave portion 2121b is formed on the side of the wall portion 2121 away from the electrode assembly 22 and corresponding to the position of the convex portion 2121a, and the convex portion 2121a is connected to the first connecting portion 231.

[0196] Illustratively, the wall portion 2121 is formed by stamping, so as to form a convex portion 2121a and a concave portion 2121b on both sides of the wall portion 2121 along the first direction X. Of course, in other embodiments, the wall portion 2121 may also be formed by casting or other processes.

[0197] It should be noted that in the embodiment where the first connecting portion 231 and the second connecting portion 232 are welded together to form the first weld mark 233, and the first connecting portion 231 and the electrode lead portion 211 are welded together to form the second weld mark 24, the protrusion 2121a is connected to the first connecting portion 231, that is, the protrusion 2121a is the electrode lead portion 211, and the protrusion 2121a and the first connecting portion 231 are welded together to form the second weld mark 24. In FIG6, the projection of the protrusion 2121a in the first direction X overlaps with the projection of the first weld mark 233 in the first direction X. Of course, in some embodiments, please refer to FIG13, which is a partial cross-sectional view of the battery cell 20 provided in some embodiments of the present application in other embodiments. The projection of the convex portion 2121a in the first direction X and the projection of the first weld mark 233 in the first direction X can also be set to not overlap, that is, the first weld mark 233 is located on the outside of the convex portion 2121a in the radial direction of the convex portion 2121a. During the actual assembly process, since the first weld mark 233 will protrude from the surface of the first connecting portion 231 facing the convex portion 2121a in the first direction X, the battery cell 20 adopting this structure can effectively reduce the interference between the first weld mark 233 and the convex portion 2121a, so that the convex portion 2121a and the first connecting portion 231 can be tightly fitted in the first direction X, thereby effectively reducing the influence of the first weld mark 233 on the welded connection between the convex portion 2121a and the first connecting portion 231, which is conducive to improving the welding quality between the convex portion 2121a and the first connecting portion 231.

[0198] By forming a convex portion 2121a on one side of the wall portion 2121 facing the electrode assembly 22 and a corresponding concave portion 2121b on the other side, the wall portion 2121 is formed into a concave-convex structure formed by stamping, so that the electrical connection between the electrode assembly 22 and the wall portion 2121 can be achieved by welding the convex portion 2121a of the wall portion 2121 to the first connecting portion 231 of the collecting component 23. The wall portion 2121 with this structure can effectively improve the structural strength of the wall portion 2121, so as to alleviate the deformation phenomenon when the wall portion 2121 and the first connecting portion 231 are welded to each other, thereby helping to improve the production quality of the battery cell 20.

[0199] According to some embodiments of the present application, referring to Figures 14, 15, and 16, Figure 14 is a schematic structural diagram of a battery cell 20 provided in further embodiments of the present application, Figure 15 is an exploded structural diagram of a battery cell 20 provided in further embodiments of the present application, and Figure 16 is a partial cross-sectional view of a battery cell 20 provided in further embodiments of the present application. The housing assembly 21 further includes a housing 212, and the electrode assembly 22 is accommodated within the housing 212. The housing 212 has a wall portion 2121, and the electrode lead portion 211 is insulated and mounted on the wall portion 2121.

[0200] In which, the outer shell 212 has a wall portion 2121, and the electrode lead-out portion 211 is insulated and installed on the wall portion 2121, that is, the electrode lead-out portion 211 is a component insulated and installed on a wall of the outer shell 212, and no electrical connection is formed between the electrode lead-out portion 211 and the wall portion 2121 of the outer shell 212, so that the welding connection between the electrode lead-out portion 211 and the first connection portion 231 of the current collecting component 23 can realize the input or output of electrical energy of the battery cell 20.

[0201] The shell assembly 21 is also provided with a shell 212. By insulating and installing the electrode lead-out portion 211 on the wall portion 2121 of the shell 212, the input or output of electrical energy of the battery cell 20 can be achieved through the electrode lead-out portion 211. The battery cell 20 adopting this structure can reduce the risk of short circuit between the electrode lead-out portion 211 and the shell 212.

[0202] According to some embodiments of the present application, as shown in Figures 4 and 5 and Figures 15 and 16, the housing 212 includes a shell 2122 and an end cap 2123. The shell 2122 defines an accommodation cavity with an opening 2122a, and the electrode assembly 22 is accommodated in the accommodation cavity. The end cap 2123 closes the opening 2122a and is formed as a wall portion 2121.

[0203] The end cover 2123 is a wall portion 2121 , that is, the end cover 2123 is welded to the first connection portion 231 of the current collecting member 23 or the electrode lead portion 211 is insulated and installed on the end cover 2123 , so that the current collecting member 23 is located between the main body 221 and the end cover 2123 in the first direction X.

[0204] The wall portion 2121 of the outer shell 212 is the end cover 2123 of the outer shell 212 for closing the opening 2122a of the shell 2122. The battery cell 20 adopting this structure is convenient for assembling the current collecting component 23, which is beneficial to reducing the difficulty of connecting the current collecting component 23 with the electrode lead-out portion 211 and the current collecting component 23 with the pole ear 222, thereby improving the production efficiency of the battery cell 20.

[0205] 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 212 includes a shell 2122 and an end cap 2123. The shell 2122 includes an integrally formed sidewall and wall portion 2121. The sidewall is disposed around the wall portion 2121. One end of the sidewall is connected to the wall portion 2121, and the other end of the sidewall forms an opening 2122a opposite the wall portion 2121. The sidewall and wall portion 2121 together define a cavity for accommodating the electrode assembly 22, and the end cap 2123 closes the opening 2122a. In other words, the wall portion 2121 is the bottom wall of the shell 2122, which is disposed opposite the end cap 2123 in the first direction X. That is, the bottom wall of the shell 2122 is welded to the first connection portion 231 of the current collecting member 23, or the electrode lead portion 211 is insulated and mounted on the bottom wall of the shell 2122.

[0206] The shell 2122 includes an integrally formed side wall and wall portion 2121 , that is, the shell 2122 is made using an integral molding process, such as stamping, casting or extrusion molding, etc., that is, the side wall and wall portion 2121 of the shell 2122 are an integral structure.

[0207] By setting the wall portion 2121 as a wall arranged opposite to the shell 2122 and the end cover 2123, the battery cell 20 adopting this structure can keep the collecting component 23 and other components away from the end cover 2123, and there is no direct connection between the wall portion 2121 and the end cover 2123, thereby alleviating the phenomenon that the force generated by the pulling or twisting of the electrode lead-out portion 211 by the collecting component 23 and other components acts on the end cover 2123, thereby reducing the risk of connection failure between the end cover 2123 and the shell 2122, and further helping to further reduce the risk of leakage of the battery cell 20 during use.

[0208] According to some embodiments of the present application, the present application further provides a battery 100 comprising the battery cell 20 of any of the above solutions.

[0209] In some embodiments, as shown in FIG. 2 , the battery 100 may further include a box 10 for accommodating the battery cells 20 .

[0210] The housing 10 is used to provide assembly space for the battery cells 20 and can have various structures. 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 overlap each other, and together they define an assembly space for accommodating the battery cells 20. The second housing body 12 can be a hollow structure with one end open. The first housing body 11 can be a plate-like structure, with the first housing body 11 overlapping the open side of the second housing body 12, so that the first and second housing bodies 11 and 12 jointly define an assembly space. The first and second housing bodies 11 and 12 can also be hollow structures with one end open, with the open side of the first housing body 11 overlapping the open side of the second housing body 12. Of course, the housing 10 formed by the first and second housing bodies 11 and 12 can have various shapes, such as a cylinder, a rectangular parallelepiped, etc. For example, in FIG. 2 , the housing 10 is shaped as a rectangular parallelepiped.

[0211] For example, in FIG2 , the battery 100 may include multiple battery cells 20 , which may be connected in series, in parallel, or in a hybrid configuration. A hybrid configuration refers to a configuration in which multiple battery cells 20 are 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, which is then connected in series, in parallel, or in a hybrid configuration to form a complete structure housed within the housing 10 . The battery 100 may also include other structures. For example, the battery 100 may further include a busbar assembly, which is used to connect the multiple battery cells 20 to achieve electrical connection between the multiple battery cells 20 .

[0212] According to some embodiments of the present application, the present application further provides an electrical device, comprising the battery 100 of any of the above solutions, and the battery 100 is used to provide electrical energy to the electrical device.

[0213] The power-consuming device may be any of the aforementioned devices or systems using the battery 100 .

[0214] According to some embodiments of the present application, as shown in Figures 3 to 8, the present application provides a battery cell 20, which includes a housing assembly 21, an electrode assembly 22, and a current collecting member 23. The housing assembly 21 has an electrode lead 211 for inputting or outputting electrical energy. The housing assembly 21 includes a housing 212, which has a wall 2121, which serves as the electrode lead 211. The housing 212 includes a shell 2122 and an end cap 2123. The shell 2122 defines a receiving cavity with an opening 2122a. The end cap 2123 closes the opening 2122a. The end cap 2123 serves as the wall 2121. The wall 2121 has a convex portion 2121a formed on the side facing the interior of the housing 212, and a concave portion 2121b formed on the side facing away from the interior of the housing 212, corresponding to the convex portion 2121a. The electrode assembly 22 is accommodated in the accommodating cavity of the shell 2122. The electrode assembly 22 includes a main body 221 and a pole ear 222. The main body 221 is cylindrical. Along the first direction X, the pole ear 222 is connected to one end of the main body 221 facing the wall 2121. The pole ear 222 and the wall 2121 are made of different materials. The current collecting member 23 is disposed within the housing 212 and includes a first connecting portion 231 made of the same material as the wall portion 2121 and a second connecting portion 232 made of the same material as the tab 222. The first connecting portion 231 and the second connecting portion 232 are connected. Along the first direction X, the first connecting portion 231 and the second connecting portion 232 are stacked between the wall portion 2121 and the tab 222. The first connecting portion 231 is located on the side of the second connecting portion 232 facing the electrode lead portion 211. The first connecting portion 231 is welded to the protrusion 2121a of the wall portion 2121, and the second connecting portion 232 is welded to the tab 222. Both the first connecting portion 231 and the second connecting portion 232 have a disc structure and are coaxially disposed with the same radius. The first connecting portion 231 is provided with a first through-hole 2311 extending along the first direction X. The second connecting portion 232 forms a connection area 2321 welded to the tab 222 in an area corresponding to the first through-hole 2311. The second connecting portion 232 is provided with a second through-hole 2322 extending along the first direction X. The first through-hole 2311 and the second through-hole 2322 are coaxially arranged, and the radius of the first through-hole 2311 is greater than the radius of the second through-hole 2322. The first connecting portion 231 and the second connecting portion 232 are welded together to form a first weld mark 233. The first connecting portion 231 is welded together to the electrode lead portion 211 to form a second weld mark 24. The second connecting portion 232 is welded together to the tab 222 to form a third weld mark 25. Along the first direction X, the projections of the first weld mark 233, the second weld mark 24, and the third weld mark 25 on a plane perpendicular to the first direction X do not overlap.

[0215] 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.

[0216] 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, include: A housing assembly including an electrode lead-out portion for inputting or outputting electrical energy; An electrode assembly is contained in the housing assembly, the electrode assembly comprises a main body and a tab, the tab is connected to the main body, and the tab is made of a different material from the electrode lead-out portion; as well as A current collecting component is arranged in the shell assembly, and the current collecting component includes a first connecting portion made of the same material as the electrode lead-out portion and a second connecting portion made of the same material as the pole tab, the first connecting portion is connected to the second connecting portion, the first connecting portion is welded to the electrode lead-out portion, and the second connecting portion is welded to the pole tab.

2. The battery cell according to claim 1, in, Along the first direction, the current collecting member is disposed between the main body and the electrode lead-out portion; Wherein, along the first direction, the first connection portion and the second connection portion are stacked, and the first connection portion is located on a side of the second connection portion facing the electrode lead-out portion.

3. The battery cell according to claim 2, in, Along the first direction, the tab is disposed on a side of the main body facing the second connecting portion.

4. The battery cell according to claim 2 or 3, in, Along the first direction, the second connection portion has a connection area not covered by the first connection portion, and the connection area is welded to the tab.

5. The battery cell according to claim 4, in, The first connecting portion is provided with a first through hole, the first through hole penetrates through two sides of the first connecting portion in the first direction, and the second connecting portion corresponds to the first through hole to form the connecting area.

6. The battery cell according to claim 5, in, The connection area is provided with a second through hole communicating with the first through hole, the second through hole passes through two sides of the second connection portion in the first direction, and the aperture of the second through hole is smaller than the aperture of the first through hole.

7. The battery cell according to claim 5 or 6, in, An outer circumferential surface of the first connecting portion is flush with an outer circumferential surface of the second connecting portion.

8. The battery cell according to claim 4, in, The connection area surrounds an outer side of a projection of the first connection portion on the second connection portion along the first direction.

9. The battery cell according to claim 8, in, The first connection portion is provided with a first through hole, which passes through both sides of the first connection portion in the first direction; the second connection portion is provided with a second through hole, which passes through both sides of the second connection portion in the first direction; the first through hole is connected to the second through hole.

10. The battery cell according to claim 9, in, The first through hole and the second through hole are coaxially arranged and have the same radius.

11. The battery cell according to any one of claims 2 to 10, in, The first connection portion and the second connection portion are both disc structures, and the first connection portion and the second connection portion are coaxially arranged.

12. The battery cell according to claim 1, in, Along the first direction, the current collecting member is disposed between the main body and the electrode lead-out portion; The first connection portion surrounds the outer side of the second connection portion, and the inner circumference of the first connection portion is connected to the outer circumference of the second connection portion; or The second connection portion surrounds the outer side of the first connection portion, and the inner peripheral surface of the second connection portion is connected to the outer peripheral surface of the first connection portion.

13. The battery cell according to any one of claims 1 to 12, in, The first connection portion is welded to the second connection portion to form a first weld mark, and the first connection portion is welded to the electrode lead portion to form a second weld mark; Wherein, along the first direction, the current collecting member is arranged between the main body and the electrode lead-out portion, and the projections of the first weld mark and the second weld mark in a plane perpendicular to the first direction do not overlap.

14. The battery cell according to claim 13, in, The second weld mark surrounds the outer side of the first weld mark.

15. The battery cell according to any one of claims 1 to 14, in, The first connection portion is welded to the second connection portion to form a first weld mark, and the second connection portion is welded to the tab to form a third weld mark; Wherein, along the first direction, the current collecting member is arranged between the main body and the electrode lead-out portion, and the projections of the first weld mark and the third weld mark in a plane perpendicular to the first direction do not overlap.

16. The battery cell according to any one of claims 1 to 15, in, The main body is cylindrical.

17. The battery cell according to any one of claims 1 to 16, in, The housing assembly comprises a housing, and the electrode assembly is accommodated in the housing; Wherein, the shell has a wall portion, and the wall portion is the electrode lead-out portion.

18. The battery cell according to claim 17, in, A convex portion is formed on a side of the wall portion facing the electrode assembly, a concave portion is formed on a side of the wall portion facing away from the electrode assembly and corresponding to the position of the convex portion, and the convex portion is connected to the first connecting portion.

19. The battery cell according to any one of claims 1 to 16, in, The housing assembly further comprises a housing, and the electrode assembly is accommodated in the housing; The housing has a wall portion, and the electrode lead-out portion is insulated and mounted on the wall portion.

20. The battery cell according to any one of claims 17 to 19, in, The housing comprises: A housing having an opening formed therein, wherein the electrode assembly is accommodated in the housing; an end cap for closing the opening; Wherein, the end cover is the wall portion.

21. The battery cell according to any one of claims 17 to 19, in, 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, one end of the side wall is connected to the wall portion, and the other end of the side wall forms an opening opposite to the wall portion, and the side wall and the wall portion jointly define a housing cavity for housing the electrode assembly; An end cap closes the opening.

22. A battery comprising the battery cell according to any one of claims 1 to 21.

23. An electrical device comprising the battery as claimed in claim 22.

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