Battery cell, battery, and electrical device

Abstract

The present application relates to the technical field of batteries, and provides a battery cell, a battery, and an electric device. The battery cell comprises a casing, an electrode terminal, and an electrode assembly. The casing has a wall portion. The electrode terminal is insulatively mounted on the wall portion. The electrode assembly is accommodated in the casing; the electrode assembly comprises a main body portion, a first tab, and a second tab; the polarities of the first tab and of the second tab are opposite; in the thickness direction of the wall portion, the first tab and the second tab are both arranged at the end of the main body portion facing the wall portion, the wall portion has a first surface facing the electrode assembly, a connecting portion protrudes from the first surface, the connecting portion is electrically connected to the first tab, and the electrode terminal is electrically connected to the second tab. According to the battery cell, the height of the first tab protruding from the main body portion can be optimized, the effect of contact between the connecting portion and the first tab can be improved, and a component of a special-shaped structure connecting the wall portion and the first tab does not need to be provided between the wall portion and the first tab, so as to reduce the assembly difficulty of the battery cell.

Description

Battery cells, batteries and electrical devices

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent application No. 2023111863066, filed on September 14, 2023, entitled “Battery Cell, Battery and Electrical Device,” the entire contents of which are incorporated herein by reference. Technical Field

[0003] 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

[0004] New energy vehicles have experienced rapid growth in recent years. Within the electric vehicle sector, power batteries, as the power source, 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. Battery cells typically consist of a housing and an electrode assembly housed within the housing. However, existing battery cell assembly is difficult, hindering the efficiency of battery cell production.

[0005] Summary of the Invention

[0006] The embodiments of the present application provide a battery cell, a battery, and an electrical device, which can effectively improve the production efficiency of the battery cell.

[0007] In a first aspect, an embodiment of the present application provides a battery cell, comprising a shell, an electrode terminal and an electrode assembly; the shell has a wall portion; the electrode terminal is insulated and mounted on the wall portion; the electrode assembly is accommodated in the shell, the electrode assembly comprising a main body portion, a first pole ear and a second pole ear, the polarities of the first pole ear and the second pole ear being opposite, and along the thickness direction of the wall portion, the first pole ear and the second pole ear are both arranged at one end of the main body portion facing the wall portion; wherein, along the thickness direction of the wall portion, the wall portion has a first surface facing the electrode assembly and a second surface away from the first surface, and a connecting member is convexly provided on the first surface A groove is formed on the second surface at a position corresponding to the connecting portion, the connecting portion is electrically connected to the first pole tab, and the electrode terminal is electrically connected to the second pole tab; the battery cell also includes a first current collecting member, the first current collecting member is connected to the first pole tab, the bottom wall of the groove is welded to the first current collecting member to electrically connect the first pole tab and the wall portion, or the bottom wall of the groove is welded to the first pole tab to electrically connect the first pole tab and the wall portion; along the thickness direction of the wall portion, the projected area of ​​the groove is S1, and the projected area of ​​the wall portion is S2, satisfying 0.1S2≤S1≤0.5S2.

[0008] In the above technical solution, by arranging the first and second tabs of the electrode assembly at the same end of the main body facing the wall in the thickness direction of the wall, it is advantageous to save space occupied by the electrode assembly, thereby improving the energy density of the battery cell. Specifically, by protruding a connecting portion on the first surface of the wall, and the connecting portion being used to electrically connect to the first tab, on the one hand, it is convenient to electrically connect the wall portion to the first tab via the connecting portion, which is advantageous to optimize the height of the first tab protruding from the main body, and is advantageous to improve the contact effect between the connecting portion and the first tab, thereby effectively improving the electrical connection effect between the wall portion and the first tab. On the other hand, it can reduce the difficulty of electrical connection between the first tab and the wall portion, eliminating the need to arrange a special-shaped component connecting the wall portion and the first tab between the wall portion and the first tab, thereby reducing the difficulty of assembling the battery cell, thereby effectively improving the production efficiency of the battery cell. In addition, a groove is formed at the position of the connecting portion corresponding to the second surface of the wall portion. On the one hand, the connecting portion of the wall portion is a concave-convex structure that can be formed by stamping, so that the connecting portion and the groove are respectively formed on both sides of the wall portion, which is convenient for manufacturing and helps to reduce the difficulty of processing the connecting portion. On the other hand, the thickness of the connecting portion can be thinned by the groove to reduce the difficulty of electrical connection between the connecting portion and the first pole ear. At the same time, by setting the projected area of ​​the groove in the thickness direction of the wall portion to be greater than or equal to 0.1 times the projected area of ​​the wall portion in the thickness direction of the wall portion, the area of ​​the region where the connecting portion is thinned by the groove is increased, thereby effectively increasing the area of ​​the welding connection between the connecting portion and the first current collecting member or the first pole ear, which helps to increase the flow area between the connecting portion and the first pole ear. In addition, by setting the projected area of ​​the groove in the thickness direction of the wall to be less than or equal to 0.5 times the projected area of ​​the wall in the thickness direction of the wall, the phenomenon of the groove occupying too much space on the wall can be alleviated. On the one hand, it is beneficial to improve the structural strength of the wall to reduce the risk of deformation or breakage of the wall during use. On the other hand, it can alleviate the phenomenon that there are too many protruding connection parts in the area corresponding to the groove on the first surface of the wall, which causes interference between the connection parts and other components inside the battery cell.

[0009] In some embodiments, the minimum width of the groove is W, satisfying W≥5mm.

[0010] In the above technical solution, by setting the minimum width of the groove to be greater than or equal to 5 mm, so as to facilitate welding connection of the bottom wall of the groove with the first current collecting member or the first electrode tab, it is helpful to reduce the difficulty of welding connection between the area of ​​the connection portion thinned by the groove and the first current collecting member or the first electrode tab, thereby effectively alleviating the phenomenon that the width of the groove is too small to weld the bottom wall of the groove with the first current collecting member or the first electrode tab.

[0011] In some embodiments, the groove is an arc-shaped groove extending along a circular arc trajectory.

[0012] In the above technical solution, the groove is set as an arc-shaped groove structure extending along a circular arc trajectory to facilitate processing and manufacturing, and the range of the area where the bottom wall of the groove and the first current collecting member or the first electrode tab are welded to each other can be expanded, thereby effectively improving the electrical connection effect between the wall and the first electrode tab.

[0013] In some embodiments, the shell is cylindrical, the central axis of the shell extends along the thickness direction of the wall portion, and the central axis of the shell passes through the center of the arc trajectory of the groove.

[0014] In the above technical solution, the outer shell is set as a cylindrical structure, and the central axis of the outer shell is a structure extending along the thickness direction of the wall portion, so that the shape of the wall portion is circular, and the central axis of the outer shell is set as the center of the arc trajectory passing through the groove, so that the groove is an arc-shaped groove structure arranged around the central axis of the outer shell. On the one hand, it is beneficial to improve the space utilization of the groove on the wall portion, and on the other hand, it is easy to manufacture, and can further expand the range of the area where the bottom wall of the groove and the first current collecting member or the first pole ear are welded to each other, so as to improve the electrical connection effect between the wall portion and the first pole ear.

[0015] In some embodiments, along the thickness direction of the wall portion, a dimension D1 of the connecting portion protruding from the first surface satisfies D1≤8 mm.

[0016] In the above technical solution, by setting the size of the connecting portion protruding from the first surface to be less than or equal to 8 mm, on the one hand, the phenomenon of excessive space occupied by the connecting portion can be reduced, which is beneficial to improving the internal space utilization of the battery cell; on the other hand, the interference effect of the connecting portion on the electrical connection between the electrode terminal and the second tab can be reduced.

[0017] In some embodiments, a plurality of the connecting portions are protruding from the first surface.

[0018] In the above technical solution, by protruding multiple connecting portions on the first surface of the wall portion, the wall portion can be electrically connected to the first pole ear through the multiple connecting portions, which is beneficial to improving the effect of mutual electrical connection between the wall portion and the first pole ear, and can increase the flow area between the wall portion and the first pole ear.

[0019] In some embodiments, the wall portion is provided with an assembly hole, and the assembly hole penetrates the wall portion along a thickness direction of the wall portion, and the electrode terminal is provided in the assembly hole and protrudes from the first surface.

[0020] In the above technical solution, the electrode terminal is provided with a structure protruding from the first surface in the thickness direction of the wall portion so as to facilitate electrical connection between the electrode terminal and the second pole ear, which is conducive to reducing the difficulty of electrical connection between the electrode terminal and the second pole ear, and the connection portion protruding from the first surface of the wall portion can compensate for the height difference between the end face of the electrode terminal facing the electrode assembly and the first surface of the wall portion, thereby effectively improving the electrical connection effect between the electrode terminal and the second pole ear while achieving electrical connection between the wall portion and the first pole ear.

[0021] In some embodiments, along the thickness direction of the wall portion, a dimension of the connecting portion protruding from the first surface is D1, and a dimension of the electrode terminal protruding from the first surface is D2, satisfying D1=D2.

[0022] In the above technical solution, by setting the size of the connecting portion protruding from the first surface to be the same as the size of the electrode terminal protruding from the first surface, the end surface of the connecting portion facing the electrode assembly and the end surface of the electrode terminal facing the electrode assembly are flush with each other in the thickness direction of the wall portion. On the one hand, the difficulty of electrical connection between the connecting portion and the first pole ear and between the electrode terminal and the second pole ear can be reduced. On the other hand, the mutual influence between the connecting portion and the electrode terminal can be reduced, resulting in poor electrical connection between the connecting portion and the first pole ear or between the electrode terminal and the second pole ear.

[0023] In some embodiments, the battery cell further includes a first current collecting member and a second current collecting member; the first current collecting member is located between the connecting portion and the first pole tab, and the first current collecting member connects the connecting portion and the first pole tab; the second current collecting member is located between the electrode terminal and the second pole tab, the second current collecting member is spaced apart from the first current collecting member, and the second current collecting member connects the electrode terminal and the second pole tab.

[0024] In the above technical solution, a first current collecting member is provided between the connecting portion of the wall portion and the first tab, and the first current collecting member connects the connecting portion and the first tab to achieve electrical connection between the first tab and the wall portion, thereby reducing the difficulty of electrically connecting the first tab and the connecting portion. Similarly, a second current collecting member is provided between the electrode terminal and the second tab, and the second current collecting member connects the electrode terminal and the second tab to achieve electrical connection between the second tab and the electrode terminal, thereby reducing the difficulty of electrically connecting the second tab and the electrode terminal. Furthermore, by spacing the first and second current collecting members apart, the possibility of short circuits between the first and second current collecting members is reduced, thereby reducing the risk of battery cell use.

[0025] In some embodiments, along the thickness direction of the wall portion, the first current collecting member has a third surface facing the wall portion, the third surface is connected to the connecting portion, and the second current collecting member has a fourth surface facing the wall portion, the fourth surface is connected to the electrode terminal; wherein the third surface and the fourth surface are flush.

[0026] In the above technical solution, by setting the third surface of the first current collecting member to a structure that is flush with the fourth surface of the second current collecting member, on the one hand, it is convenient to assemble the first current collecting member and the second current collecting member, which is conducive to reducing the difficulty of assembling the first current collecting member and the second current collecting member between the wall portion and the electrode assembly. On the other hand, the connection portion set on the first surface of the wall portion can compensate for the gap between the first current collecting member and the wall portion, so that the first current collecting member can be electrically connected to the wall portion, and the contact effect between the first current collecting member and the wall portion can be improved.

[0027] In some embodiments, along the thickness direction of the wall portion, the first electrode tab has a fifth surface facing the wall portion, the first current collecting member is connected to the fifth surface, and the second electrode tab has a sixth surface facing the wall portion, the second current collecting member is connected to the sixth surface; wherein the fifth surface is flush with the sixth surface.

[0028] In the above technical solution, by setting the fifth surface of the first electrode tab facing the wall and the sixth surface of the second electrode tab facing the wall to be flush with each other, on the one hand, it is convenient to process the first electrode tab and the second electrode tab, and on the other hand, it can achieve a structure in which the first current collecting member and the second current collecting member are flush with each other on the side facing the electrode assembly in the thickness direction of the wall, so as to reduce the position difference between the first current collecting member and the second current collecting member in the thickness direction of the wall, thereby reducing the difficulty of assembling the first current collecting member and the second current collecting member between the electrode assembly and the wall, and improving the internal space utilization rate of the battery cell.

[0029] In some embodiments, the battery cell further includes a first insulating member; the first insulating member is disposed between the electrode assembly and the wall portion, and the first insulating member insulates and isolates the first current collecting member from the second current collecting member.

[0030] In the above technical solution, a first insulating member is provided between the electrode assembly and the wall portion, and the first insulating member is used to insulate and isolate the first current collecting member and the second current collecting member, thereby achieving insulation isolation between the first current collecting member and the second current collecting member, which is beneficial to further reduce the risk of short circuit between the first current collecting member and the second current collecting member.

[0031] In some embodiments, the first insulating member is provided with a first mounting hole and a second mounting hole arranged at intervals, the first current collecting member is provided in the first mounting hole, and the second current collecting member is provided in the second mounting hole.

[0032] In the above technical solution, by providing the first mounting holes and the second mounting holes arranged at intervals on the first insulating member, and the first current collecting member and the second current collecting member are respectively provided in the first mounting holes and the second mounting holes, on the one hand, the first current collecting member and the second current collecting member can be assembled to the first insulating member, so that the first insulating member can support and assemble the first current collecting member and the second current collecting member, which is conducive to reducing the difficulty of arranging the first current collecting member and the second current collecting member between the wall portion and the electrode assembly. On the other hand, the first current collecting member and the second current collecting member can be arranged at intervals on the first insulating member to achieve insulation isolation between the first current collecting member and the second current collecting member.

[0033] In some embodiments, the first insulating member includes a first insulator and a second insulator; the first insulator is a ring structure; the second insulator is connected to the first insulator, and the second insulator is configured to separate the internal space of the first insulator into the first mounting hole and the second mounting hole, and the second insulator is located between the first current collecting component and the second current collecting component.

[0034] In the above technical solution, the first insulating member is provided with a first insulator of an annular structure and a second insulator connected to the inner side of the first insulator, and the second insulator is configured to separate the internal space of the first insulator into a first mounting hole and a second mounting hole, so that the first insulator and the second insulator jointly define the first mounting hole and the second mounting hole for assembling the first current collecting member and the second current collecting member. The first insulating member with such a structure can, on the one hand, be surrounded by the first insulator around the outer side of the first current collecting member and the second current collecting member, so that the first current collecting member and the second current collecting member can be separated from the outer shell, which is beneficial to reducing the risk of short circuit between the first current collecting member and the second current collecting member and the outer shell; on the other hand, the first current collecting member and the second current collecting member can be separated by the second insulator, which is beneficial to reducing the risk of short circuit between the first current collecting member and the second current collecting member.

[0035] In some embodiments, the shell is cylindrical, and the central axis of the shell extends along the thickness direction of the wall portion.

[0036] In the above technical solution, the outer shell is set to be cylindrical to facilitate processing to form a cylindrical battery cell, so that the battery cell has the advantages of high capacity, long cycle life, and a wide range of operating ambient temperatures.

[0037] In some embodiments, the outer shell includes a shell and an end cover; the shell includes a side wall and the wall portion, the side wall is arranged around the wall portion, and along the thickness direction of the wall portion, one end of the side wall is connected to the wall portion, and the other end is enclosed to form an opening, and the side wall and the wall portion jointly define a accommodating cavity for accommodating the electrode assembly; the end cover closes the opening.

[0038] In the above technical solution, by setting the wall portion of the outer shell as the bottom wall arranged opposite to the shell and the end cover, the wall portion where the electrode terminal is arranged and used for electrical connection with the first pole ear can be kept away from the end cover, thereby reducing the influence of the stress generated when the end cover and the shell are connected to each other on the wall portion or the electrode terminal arranged on the wall portion, which is beneficial to improving the reliability and service life of the battery cell.

[0039] In some embodiments, the housing includes a shell and an end cover; a receiving cavity with an opening is formed inside the shell, and the receiving cavity is used to receive the electrode assembly; the end cover closes the opening; wherein the end cover is the wall portion.

[0040] In the above technical solution, by setting the wall portion of the shell as the end cover for closing the opening of the shell, the battery cell adopting this structure is convenient for assembling the electrode terminal on the end cover, and can reduce the difficulty of electrically connecting the first pole ear and the second pole ear with the end cover and the electrode terminal respectively, thereby helping to reduce the manufacturing difficulty of the battery cell and improve the production efficiency of the battery cell.

[0041] In a second aspect, an embodiment of the present application further provides a battery comprising the above-mentioned battery cell.

[0042] In a third aspect, an embodiment of the present application further provides an electrical device, comprising the above-mentioned battery cell, wherein the battery cell is used to provide electrical energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] 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.

[0044] FIG1 is a schematic structural diagram of a vehicle provided in some embodiments of the present application;

[0045] FIG2 is an exploded view of the structure of a battery provided in some embodiments of the present application;

[0046] FIG3 is a schematic structural diagram of a battery cell provided in some embodiments of the present application;

[0047] FIG4 is an exploded view of the structure of a battery cell provided in some embodiments of the present application;

[0048] FIG5 is a partial cross-sectional view of a battery cell provided in some embodiments of the present application;

[0049] FIG6 is a partial enlarged view of the battery cell at point A shown in FIG5 ;

[0050] FIG7 is a top view of a battery cell provided in some embodiments of the present application;

[0051] FIG8 is a top view of a battery cell provided in some other embodiments of the present application;

[0052] FIG9 is a schematic diagram showing the connection between the first current collecting member and the second current collecting member of a battery cell provided in some embodiments of the present application, assembled on the first insulating member;

[0053] FIG10 is a schematic structural diagram of a first insulating member of a battery cell provided in some embodiments of the present application.

[0054] Icon: 1000-Vehicle; 100-Battery; 10-Box; 11-First Box Body; 12-Second Box Body; 20-Battery Cell; 21-Casing; 211-Wall; 2111-First Surface; 2112-Connecting Portion; 2113-Assembly Hole; 2114-Second Surface; 2115-Groove; 212-Casing; 2121-Opening; 2122-Side Wall; 2123-Bottom Wall; 213-End Cap; 22-Electrode Terminal; 23-Electrode Assembly; 231-Main Body part; 232-first electrode tab; 2321-fifth surface; 233-second electrode tab; 2331-sixth surface; 24-second insulating member; 25-first current collecting member; 251-third surface; 26-second current collecting member; 261-fourth surface; 27-pressure relief component; 28-first insulating member; 281-first mounting hole; 282-second mounting hole; 283-first insulator; 284-second insulator; 200-controller; 300-motor; X-thickness direction of the wall. DETAILED DESCRIPTION

[0055] 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.

[0056] 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.

[0057] 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.

[0058] 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.

[0059] 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.

[0060] 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.

[0061] The term "plurality" used in this application refers to two or more (including two).

[0062] 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.

[0063] 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.

[0064] 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.

[0065] 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.

[0066] 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.

[0067] As an example, the positive electrode current collector may be a metal foil or a composite current collector. For example, as the metal foil, aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium, etc. may be used. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector may be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0068] 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 battery positive electrode active materials may also be used. These positive electrode active materials may be used alone or in combination of two or more. Among them, examples of lithium-containing phosphates may include but are not limited to at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO4), a composite material of lithium manganese phosphate and carbon, lithium iron manganese phosphate, and a composite material of lithium iron manganese phosphate and carbon. Examples of lithium transition metal oxides may include but are not limited to lithium cobalt oxide (such as LiCoO2), lithium nickel oxide (such as LiNiO2), lithium manganese oxide (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide (such as LiNi 1 / 3 Co 1 / 3 Mn 1 / 3O2 (also referred to as NCM 333 ), LiNi 0.5 Co 0.2 Mn 0.3 O2 (also referred to as NCM 523 ), LiNi 0.5 Co 0.25 Mn 0.25 O2 (also referred to as NCM 211 ), LiNi 0.6 Co 0.2 Mn 0.2 O2 (also referred to as NCM 622 ), LiNi 0.8 Co 0.1 Mn 0.1 O2 (also referred to as NCM 811 ), lithium nickel cobalt aluminum oxide (such as LiNi 0.85 Co 0.15 Al 0.05 O2) and at least one of its modified compounds, etc.

[0069] In some embodiments, a positive electrode may be a metal foam. The metal foam may be nickel foam, copper foam, aluminum foam, alloy foam, or carbon foam, among others. When a metal foam is used as the positive electrode, the surface of the metal foam may or may not be provided with a positive electrode active material. For example, a lithium source material, potassium metal, or sodium metal may be filled and / or deposited within the metal foam, where the lithium source material is lithium metal and / or a lithium-rich material.

[0070] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0071] 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.).

[0072] 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.

[0073] 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.

[0074] As an example, the negative electrode active material may adopt the negative electrode active material for battery cells that is well known in the art. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, lithium titanate, etc. The silicon-based material may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The tin-based material may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, the present application is not limited to these materials, and other traditional materials that can be used as negative electrode active materials for batteries may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0075] 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.

[0076] In some embodiments, the electrode assembly further includes a separator disposed between the positive electrode and the negative electrode.

[0077] In some embodiments, the separator is a separator membrane. There are many types of separator membranes, and any known separator membrane with a porous structure having good chemical stability and mechanical stability can be selected.

[0078] As an example, the separator can be made of at least one of fiberglass, non-woven fabric, polyethylene, polypropylene, and polyvinylidene fluoride. The separator can be a single-layer film or a multi-layer composite film. In the case of a multi-layer composite film, the materials of each layer can be the same or different. The separator can be a separate component positioned between the positive and negative electrodes, or it can be attached to the surfaces of the positive and negative electrodes.

[0079] 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.

[0080] In some embodiments, the battery cell further includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. The electrolyte can be liquid, gel, or solid. Liquid electrolytes include an electrolyte salt and a solvent.

[0081] In some embodiments, the electrolyte salt may include at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bisfluorosulfonyl imide, lithium bistrifluoromethanesulfonyl imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorooxalatoborate, lithium bisoxalatoborate, lithium difluorodioxalatophosphate, and lithium tetrafluorooxalatophosphate.

[0082] In some embodiments, the solvent may include at least one of ethylene carbonate, propylene carbonate, ethyl methyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methylpropyl carbonate, ethylpropyl carbonate, butylene carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, cyclopentane, dimethyl sulfone, methyl ethyl sulfone and diethyl sulfone. The solvent may also be an ether solvent. The ether solvent may include one or more of ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyltetrahydrofuran, diphenyl ether and crown ether.

[0083] Among them, the gel electrolyte includes a skeleton network with a polymer as the electrolyte, combined with an ionic liquid-lithium salt.

[0084] Among them, solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0085] As an example, the polymer solid electrolyte may be polyether (polyethylene oxide), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, a single ion polymer, polyionic liquid-lithium salt, cellulose, or the like.

[0086] As an example, the inorganic solid electrolyte may include an oxide solid electrolyte (crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous LiPON film), a sulfide solid electrolyte (crystalline lithium superion conductor (lithium germanium phosphosulfide, silver germanium sulfide), amorphous sulfide) and one or more of a halide solid electrolyte, a nitride solid electrolyte and a hydride solid electrolyte.

[0087] As an example, a composite solid electrolyte is formed by adding an inorganic solid electrolyte filler to a polymer solid electrolyte.

[0088] 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.

[0089] In some embodiments, the electrode assembly may be cylindrical in shape.

[0090] 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.

[0091] 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.

[0092] As an example, the battery cells may be cylindrical battery cells, prismatic battery cells, pouch battery cells, or battery cells of other shapes.

[0093] 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.

[0094] 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.

[0095] 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.

[0096] 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.

[0097] In some embodiments, the battery may be an energy storage device, including an energy storage container, an energy storage cabinet, and the like.

[0098] Batteries, with their outstanding advantages such as high energy density, low environmental pollution, high power density, long service life, wide adaptability, and low self-discharge coefficient, are a vital component of today's new energy development. The development of battery technology requires simultaneous consideration of multiple design factors, including performance parameters such as energy density, cycle life, discharge capacity, and charge / discharge rate. Furthermore, battery safety and production efficiency must also be considered.

[0099] For a general battery cell, the battery cell usually includes a shell and an electrode assembly contained in the shell, the shell includes an end cover and an integrally formed shell, the end cover is covered on one end of the shell, and the electrode assembly is usually provided with a main body and positive and negative pole ears, the positive and negative pole ears are used to output or input electrical energy of the electrode assembly, in order to save the space occupied by the electrode assembly in the shell and to improve the energy density of the battery cell, especially in a battery cell with a cylindrical structure, in the related art, the positive and negative pole ears of the electrode assembly are usually arranged at the same end of the main body, and the electrode terminal is insulated and installed on the end cover, and two current collecting components are arranged in the shell, one current collecting component connects the end cover and one pole ear of the electrode assembly, and the other current collecting component connects the electrode terminal and the other pole ear of the electrode assembly, so as to output or input the positive and negative electrodes of the battery cell respectively through the end cover and the electrode terminal, thereby realizing a structure in which the electrode assembly has pole ears on the same side, so as to save the space occupied by the electrode assembly in the shell. However, in a battery cell of this structure, since the electrode terminal protrudes from the side of the end cover facing the electrode assembly, in order to compensate for the height difference between the side of the end cover facing the electrode assembly and the electrode terminal, the current collecting component connecting the end cover and the electrode ear of the electrode assembly is usually set to a special-shaped structure, for example, a "Z" shape, so that the ear is welded to the end cover through the current collecting component. However, the current collecting component of this structure is difficult to assemble into the outer shell, and a support member needs to be provided under the current collecting component to ensure that the current collecting component can contact the end cover for welding. The structure is relatively complex and not easy to assemble, which makes the assembly of the battery cell more difficult, which is not conducive to improving the production efficiency of the battery cell.

[0100] Based on the above considerations, in order to solve the problem of the difficulty of assembling battery cells, an embodiment of the present application provides a battery cell, which includes a shell, an electrode terminal and an electrode assembly. The shell has a wall portion, and the electrode terminal is insulated and mounted on the wall portion. The electrode assembly is accommodated in the shell, and the electrode assembly includes a main body, a first pole ear and a second pole ear. The polarities of the first pole ear and the second pole ear are opposite. Along the thickness direction of the wall portion, the first pole ear and the second pole ear are both arranged at one end of the main body facing the wall portion. Along the thickness direction of the wall portion, the wall portion has a first surface facing the electrode assembly, and a connecting portion is protruding on the first surface. The connecting portion is electrically connected to the first pole ear, and the electrode terminal is electrically connected to the second pole ear.

[0101] In a battery cell of this structure, by arranging both the first and second tabs of the electrode assembly at the same end of the main body facing the wall in the thickness direction of the wall, the space occupied by the electrode assembly is saved, thereby improving the energy density of the battery cell. Specifically, by protruding a connecting portion on the first surface of the wall, and the connecting portion being electrically connected to the first tab, on the one hand, it is convenient to facilitate electrical connection between the wall and the first tab via the connecting portion, which is conducive to optimizing the height of the first tab protruding from the main body and improving the contact effect between the connecting portion and the first tab, thereby effectively improving the electrical connection effect between the wall and the first tab. On the other hand, it can reduce the difficulty of electrical connection between the first tab and the wall, eliminating the need to provide a special-shaped component connecting the wall and the first tab between the wall and the first tab, thereby reducing the difficulty of assembling the battery cell, thereby effectively improving the production efficiency of the battery cell.

[0102] 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 difficulty of assembling the battery cells and improve battery cell production efficiency.

[0103] 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.

[0104] For the convenience of description, the following embodiments are described by taking a vehicle as an example of an electrical device according to an embodiment of the present application.

[0105] 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.

[0106] 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.

[0107] 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 .

[0108] The housing 10 is used to provide assembly space for the battery cells 20 and can adopt a variety of structures. In some embodiments, the housing 10 can include a first housing body 11 and a second housing body 12. The first housing body 11 and the second housing body 12 cover each other, and the first housing body 11 and the second housing body 12 jointly define an assembly space for accommodating the battery cells 20. The second housing body 12 can be a hollow structure with one end open, and the first housing body 11 can be a plate-like structure. The first housing body 11 covers the open side of the second housing body 12, so that the first housing body 11 and the second housing body 12 jointly define the assembly space. The first housing body 11 and the second housing body 12 can also be hollow structures with one end open, and the open side of the first housing body 11 covers the open side of the second housing body 12.

[0109] Of course, the box body 10 formed by the first box body 11 and the second box body 12 can be in various shapes, such as a cylinder, a cuboid or a cube, etc. For example, in FIG2 , the box body 10 is in the shape of a cuboid.

[0110] In the battery 100, there can be one or more battery cells 20 disposed within the housing 10. When there are multiple battery cells 20 disposed within the housing 10, the multiple battery cells 20 can be connected in series, in parallel, or in a hybrid configuration. A hybrid configuration refers to a combination of series and parallel configurations within the multiple battery cells 20. The multiple battery cells 20 can be directly connected in series, in parallel, or in a hybrid configuration, and then the entire structure formed by the multiple battery cells 20 is housed within the housing 10. Alternatively, the battery 100 can be constructed by first connecting multiple battery cells 20 in series, in parallel, or in a hybrid configuration to form a battery module, which is then further connected in series, in parallel, or in a hybrid configuration to form a single structure, which is then housed within the housing 10.

[0111] In some embodiments, the battery 100 may further include other structures. For example, the battery 100 may further include a busbar component, which is used to connect the multiple battery cells 20 to achieve electrical connection between the multiple battery cells 20 .

[0112] 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, prismatic, or in other shapes. For example, in FIG3 , the battery cell 20 is cylindrical.

[0113] According to some embodiments of the present application, referring to FIG3 and further to FIG4, FIG5, and FIG6, FIG4 is an exploded view of a battery cell 20 according to some embodiments of the present application, FIG5 is a partial cross-sectional view of a battery cell 20 according to some embodiments of the present application, and FIG6 is an enlarged partial view of a portion A of the battery cell 20 shown in FIG5. The present application provides a battery cell 20, comprising a housing 21, an electrode terminal 22, and an electrode assembly 23. The housing 21 has a wall 211, and the electrode terminal 22 is insulated and mounted on the wall 211. The electrode assembly 23 is housed within the housing 21 and comprises a main body 231, a first electrode tab 232, and a second electrode tab 233. The first electrode tab 232 and the second electrode tab 233 have opposite polarities. Along the thickness direction X of the wall, the first electrode tab 232 and the second electrode tab 233 are both disposed at the end of the main body 231 facing the wall 211. Along the thickness direction X of the wall portion, the wall portion 211 has a first surface 2111 facing the electrode assembly 23 . A connecting portion 2112 is protruded from the first surface 2111 . The connecting portion 2112 is electrically connected to the first electrode tab 232 , and the electrode terminal 22 is electrically connected to the second electrode tab 233 .

[0114] The housing 21 may also be used to contain electrolytes, such as electrolyte, etc. The housing 21 may also be made of various materials, such as copper, iron, aluminum, steel, or aluminum alloy.

[0115] In some embodiments, the housing 21 may include a shell 212 and an end cover 213, and a accommodating cavity is formed inside the shell 212, which is used to accommodate the electrode assembly 23, and the accommodating cavity has an opening 2121. That is, the shell 212 is a hollow structure with an opening 2121 formed at one end, and the end cover 213 covers the opening 2121 of the shell 212 and forms a sealed connection to form a sealed space for accommodating the electrode assembly 23 and the electrolyte.

[0116] When assembling the battery cell 20 , the electrode assembly 23 may be placed in the housing 212 first, and the housing 212 may be filled with electrolyte. The end cap 213 may then be placed on the opening 2121 of the housing 212 to complete the assembly of the battery cell 20 .

[0117] The housing 212 can have a variety of shapes, such as a cylindrical or prismatic structure. The shape of the housing 212 can be determined based on the specific shape of the electrode assembly 23. For example, if the electrode assembly 23 has a cylindrical structure, a cylindrical housing 212 can be selected. Of course, the structure of the end cap 213 can also be various, such as a plate-like structure or a hollow structure with one end open. For example, in Figure 4, the housing 212 has a cylindrical structure, the central axis of the housing 212 extends along the thickness direction X of the wall, and the end cap 213 has a plate-like structure.

[0118] It should be noted that the wall portion 211 for mounting the electrode terminal 22 and provided with the connection portion 2112 can be the end cap 213 of the outer shell 21, or it can be a wall of the housing 212. For example, in Figures 3 and 4, the housing 212 can include side walls 2122 and a bottom wall 2123. The side walls 2122 are arranged around the bottom wall 2123. Along the thickness direction X of the wall portion, the bottom wall 2123 is arranged opposite the end cap 213. One end of the side wall 2122 is connected to the bottom wall 2123, and the other end is enclosed to form an opening 2121. The bottom wall 2123 is the wall portion 211 for mounting the electrode terminal 22 and provided with the connection portion 2112. Of course, the structure of the battery cell 20 is not limited to this. In other embodiments, the wall portion 211 can also be the end cap 213 of the outer shell 21.

[0119] Optionally, the side wall 2122 and the bottom wall 2123 of the shell 212 can be an integrally formed structure, for example, formed by a stamping or casting process. Of course, the side wall 2122 and the bottom wall 2123 of the shell 212 can also be a split structure, that is, the side wall 2122 and the bottom wall 2123 are separately arranged, and the bottom wall 2123 can be connected to the side wall 2122 by welding or bonding.

[0120] Exemplarily, in FIG. 4 , the side wall 2122 and the bottom wall 2123 are an integrally formed structure.

[0121] It should be noted that in the embodiment where the side wall 2122 and the bottom wall 2123 are separately provided, the end cap 213 and the side wall 2122 may be an integrally formed structure or a separate structure. For example, in FIG4 , the end cap 213 and the side wall 2122 are separately provided, and the end cap 213 is welded to an end of the side wall 2122 that is away from the bottom wall 2123 in the thickness direction X of the wall portion.

[0122] The electrode assembly 23 is a component in the battery cell 20 where electrochemical reactions occur. The structure of the electrode assembly 23 can be various. For example, in Figure 4, the electrode assembly 23 is a wound structure formed by winding a positive electrode sheet, an isolation member and a negative electrode sheet, and the main body 231 of the electrode assembly 23 is cylindrical, and the central axis of the main body 231 extends along the thickness direction X of the wall.

[0123] Illustratively, the separator is an isolation membrane, and a main material of the isolation membrane may be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, and polyvinylidene fluoride.

[0124] Among them, the main body 231 is the area where the electrode assembly 23 undergoes chemical reactions within the battery cell 20. The main body 231 is a structure formed by winding the area of ​​the positive electrode sheet coated with the positive electrode active material layer, the isolation member and the area of ​​the negative electrode sheet coated with the negative electrode active material layer. It mainly works by moving metal ions between the positive electrode sheet and the negative electrode sheet with opposite polarities.

[0125] The first pole tab 232 and the second pole tab 233 are both arranged at one end of the main body 231 facing the wall portion 211 in the thickness direction X of the wall portion, that is, the first pole tab 232 and the second pole tab 233 are arranged at the same end of the main body 231 in the thickness direction X of the wall portion, and are located at the end of the main body 231 facing the wall portion 211 in the thickness direction X of the wall portion.

[0126] The first electrode tab 232 and the second electrode tab 233 are respectively used to output or input the positive and negative electrodes of the electrode assembly 23. If the first electrode tab 232 is used to input or output the positive electrode of the electrode assembly 23, the first electrode tab 232 is formed by laminating and connecting the regions of the positive electrode sheets not coated with the positive electrode active material layer. Correspondingly, if the second electrode tab 233 is used to output or input the negative electrode of the electrode assembly 23, the second electrode tab 233 is formed by laminating and connecting the regions of the negative electrode sheets not coated with the negative electrode active material layer. If the first electrode tab 232 is used to output or input the negative electrode of the electrode assembly 23, the first electrode tab 232 is formed by laminating and connecting the regions of the negative electrode sheets not coated with the negative electrode active material layer. Correspondingly, if the second electrode tab 233 is used to input or output the positive electrode of the electrode assembly 23, the second electrode tab 233 is formed by laminating and connecting the regions of the positive electrode sheets not coated with the positive electrode active material layer. Illustratively, in the embodiment of the present application, the first electrode tab 232 is used to output or input the negative electrode of the electrode assembly 23 , and the second electrode tab 233 is used to output or input the positive electrode of the electrode assembly 23 .

[0127] The electrode terminal 22 serves to output or input electrical energy from the battery cell 20 , and can be made of various materials, such as copper, iron, aluminum, steel, or aluminum alloy.

[0128] The electrode terminal 22 is insulated and mounted on the wall portion 211, i.e., no electrical connection is formed between the electrode terminal 22 and the wall portion 211. In some embodiments, as shown in Figures 5 and 6, the wall portion 211 is provided with an assembly hole 2113. The assembly hole 2113 penetrates both sides of the wall portion 211 along the thickness direction X of the wall portion. The electrode terminal 22 is inserted into the assembly hole 2113, and the assembly holes 2113 extend from both ends of the electrode terminal 22 in the thickness direction X of the wall portion. The ends of the electrode terminal 22 in the thickness direction X of the wall portion protrude from both sides of the wall portion 211, so that one end of the electrode terminal 22 facing the electrode assembly 23 in the thickness direction X of the wall portion can be electrically connected to the second electrode tab 233, and the other end can be electrically connected to the busbar of the battery 100.

[0129] The battery cell 20 may further include a second insulating member 24 , which is disposed between the wall portion 211 and the electrode terminal 22 to insulate and isolate the wall portion 211 and the electrode terminal 22 , thereby achieving an insulated installation of the electrode terminal 22 on the wall portion 211 .

[0130] For example, the second insulating member 24 may be made of rubber, plastic, or silicone.

[0131] In Figure 6, along the thickness direction X of the wall portion, the wall portion 211 has a first surface 2111 facing the electrode assembly 23, and the electrode terminal 22 protrudes from the first surface 2111. That is, in the thickness direction X of the wall portion, one end of the electrode terminal 22 close to the electrode assembly 23 extends out from the surface of the wall portion 211 facing the electrode assembly 23, so that the end surface of the electrode terminal 22 facing the electrode assembly 23 is closer to the main body 231 of the electrode assembly 23 than the first surface 2111.

[0132] A connecting portion 2112 is protruded from the first surface 2111 . That is, the connecting portion 2112 is a structure protruded from a side of the wall portion 211 facing the electrode assembly 23 , and the connecting portion 2112 is connected to the first surface 2111 .

[0133] It should be noted that the electrical connection between the connecting portion 2112 and the first electrode tab 232 can be achieved by directly connecting the connecting portion 2112 to the first electrode tab 232, such as by welding or abutting, or by connecting the connecting portion 2112 to the first electrode tab 232 after being connected to another component, such as by connecting to the first electrode tab 232. Similarly, the electrical connection between the electrode terminal 22 and the second electrode tab 233 can be achieved by directly connecting the electrode terminal 22 to the second electrode tab 233, such as by welding or abutting, or by connecting the electrode terminal 22 to the second electrode tab 233 after being connected to another component, such as by connecting to the second electrode tab 233.

[0134] For example, in Figures 4 and 5, the battery cell 20 may further include a first current collecting member 25 and a second current collecting member 26. The first current collecting member 25 and the second current collecting member 26 are both arranged between the electrode assembly 23 and the wall portion 211. Along the thickness direction X of the wall portion, the two sides of the first current collecting member 25 are respectively connected to the connecting portion 2112 and the first electrode tab 232 to achieve electrical connection between the connecting portion 2112 and the first electrode tab 232. The connection structure between the first current collecting member 25 and the connecting portion 2112 and between the first current collecting member 25 and the first electrode tab 232 can be welding or abutment. Similarly, along the thickness direction X of the wall portion, the two sides of the second current collecting member 26 are respectively connected to the electrode terminal 22 and the second electrode tab 233 to achieve electrical connection between the electrode terminal 22 and the second electrode tab 233. The connection structure between the second current collecting member 26 and the electrode terminal 22 and between the second current collecting member 26 and the second electrode tab 233 can be welding or abutment.

[0135] In some embodiments, as shown in FIG4 , the battery cell 20 may further include a pressure relief component 27 disposed on the outer shell 21. The pressure relief component 27 is configured to release the pressure within the battery cell 20 when the internal pressure or temperature of the battery cell 20 reaches a predetermined value. Alternatively, the pressure relief component 27 may be disposed on the end cap 213 of the outer shell 21 or on the shell 212 of the outer shell 21.

[0136] For example, in FIG4 , the pressure relief component 27 is provided on the end cover 213. Similarly, the pressure relief component 27 and the housing 21 may be an integrally formed structure or a separately provided structure. For example, in FIG4 , the pressure relief component 27 and the end cover 213 of the housing 21 are an integrally formed structure, and the pressure relief component 27 is an area on the end cover 213 where a weak structure is formed, for example, the pressure relief component 27 is an area on the end cover 213 where a notched groove is provided. Of course, in other embodiments, the pressure relief component 27 and the end cover 213 may also be a split structure, and the pressure relief component 27 may be connected to the end cover 213 by welding or the like. Correspondingly, the pressure relief component 27 may be a component such as an explosion-proof valve, an explosion-proof disk, an air valve, a pressure relief valve or a safety valve.

[0137] By arranging the first electrode tab 232 and the second electrode tab 233 of the electrode assembly 23 at the same end of the main body 231 facing the wall 211 in the thickness direction X of the wall, it is beneficial to save the space occupied by the electrode assembly 23 and improve the energy density of the battery cell 20. Among them, by protruding a connecting portion 2112 on the first surface 2111 of the wall portion 211, and the connecting portion 2112 is used to electrically connect with the first pole ear 232, on the one hand, it is convenient for the wall portion 211 to be electrically connected to the first pole ear 232 through the connecting portion 2112, which is beneficial to optimizing the height of the first pole ear 232 protruding from the main body portion 231, and is beneficial to improving the contact effect between the connecting portion 2112 and the first pole ear 232, thereby effectively improving the electrical connection effect between the wall portion 211 and the first pole ear 232. On the other hand, it can reduce the difficulty of electrical connection between the first pole ear 232 and the wall portion 211, and there is no need to set a special-shaped structure component connecting the wall portion 211 and the first pole ear 232 between the wall portion 211 and the first pole ear 232, so as to reduce the assembly difficulty of the battery cell 20, thereby effectively improving the production efficiency of the battery cell 20.

[0138] According to some embodiments of the present application, as shown in Figures 4, 5 and 6, along the thickness direction X of the wall portion, the wall portion 211 has a second surface 2114 away from the first surface 2111, and a groove 2115 is formed on the second surface 2114 at a position corresponding to the connecting portion 2112.

[0139] The groove 2115 provided on the second surface 2114 of the wall portion 211 is formed by a stamping process to form the connecting portion 2112 on the first surface 2111 of the wall portion 211. The groove 2115 is formed at a position on the second surface 2114 of the wall portion 211 away from the first surface 2111 and corresponding to the connecting portion 2112. Of course, the processing method of the connecting portion 2112 protruding from the first surface 2111 of the wall portion 211 is not limited to this. In other embodiments, the connecting portion 2112 protruding from the first surface 2111 of the wall portion 211 can also be formed by a process such as casting, or can be connected to the first surface 2111 of the wall portion 211 by a connecting structure such as welding or bonding.

[0140] Exemplarily, along the thickness direction X of the wall portion, the depth of the groove 2115 is equal to the dimension of the connecting portion 2112 protruding from the first surface 2111 , so that the thickness of the groove bottom wall 2123 of the groove 2115 can be equal to the thickness of the wall portion 211 .

[0141] A groove 2115 is formed at the position of the connecting portion 2112 through the second surface 2114 of the wall portion 211. On the one hand, the connecting portion 2112 of the wall portion 211 is a concave-convex structure that can be formed by stamping, so that the connecting portion 2112 and the groove 2115 are respectively formed on both sides of the wall portion 211, which is convenient for manufacturing and helps to reduce the processing difficulty of the connecting portion 2112. On the other hand, the thickness of the connecting portion 2112 can be thinned by the groove 2115 to reduce the difficulty of electrical connection between the connecting portion 2112 and the first pole ear 232.

[0142] According to some embodiments of the present application, please continue to refer to Figures 4, 5 and 6, the battery cell 20 may further include a first current collecting member 25, which is connected to the first pole lug 232, and the bottom wall 2123 of the groove 2115 is welded to the first current collecting member 25 to electrically connect the first pole lug 232 and the wall portion 211.

[0143] Among them, along the thickness direction X of the wall portion, the first current collecting component 25 is arranged between the connecting portion 2112 and the first electrode tab 232 of the electrode assembly 23. The first current collecting component 25 serves to connect the first electrode tab 232 and the connecting portion 2112. The material of the first current collecting component 25 can be various, such as copper, iron, aluminum, steel or aluminum alloy.

[0144] The first current collecting member 25 is connected to the first electrode tab 232, that is, the side of the first current collecting member 25 facing the first electrode tab 232 is connected to the first electrode tab 232, so that the first current collecting member 25 is electrically connected to the first electrode tab 232. The connection structure between the first current collecting member 25 and the first electrode tab 232 can be various, such as welding or abutment.

[0145] The bottom wall 2123 of the groove 2115 is welded to the first current collecting member 25, that is, the area of ​​the connecting portion 2112 corresponding to the groove 2115 is welded to the first current collecting member 25, so that the wall portion 211 can be electrically connected to the first current collecting member 25 through the connecting portion 2112, that is, the area of ​​the connecting portion 2112 thinned by the groove 2115 is welded to the first current collecting member 25.

[0146] It should be noted that, in some embodiments, the battery cell 20 may not be provided with the first current collecting member 25. For example, the bottom wall 2123 of the groove 2115 is welded to the first pole lug 232 to electrically connect the first pole lug 232 and the wall portion 211. That is, the area of ​​the connecting portion 2112 thinned by the groove 2115 is directly welded to the first pole lug 232, so that the wall portion 211 can be electrically connected to the first pole lug 232 through the connecting portion 2112.

[0147] By arranging the first current collecting member 25 between the connecting portion 2112 and the first pole tab 232, the first current collecting member 25 is connected to the first pole tab 232, so that the bottom wall 2123 of the groove 2115 is welded to the first current collecting member 25, thereby realizing the electrical connection between the first pole tab 232 and the wall portion 211. The battery cell 20 adopting this structure can, on the one hand, improve the connection reliability between the connecting portion 2112 and the first current collecting member 25, so as to enhance the stability of the mutual electrical connection between the wall portion 211 and the first pole tab 232. On the other hand, by welding the bottom wall 2123 of the groove 2115 to the first current collecting member 25, the connecting portion 2112 is welded to the first current collecting member 25 in the area thinned by the groove 2115, which helps to reduce the difficulty of welding the connecting portion 2112 and the first current collecting member 25 to each other. Similarly, by directly welding the bottom wall 2123 of the groove 2115 to the first pole tab 232, an electrical connection between the wall portion 211 and the first pole tab 232 is achieved. On the one hand, the battery cell 20 adopting this structure can improve the connection reliability between the connecting portion 2112 and the first pole tab 232, so as to enhance the stability of the mutual electrical connection between the wall portion 211 and the first pole tab 232. On the other hand, by welding the bottom wall 2123 of the groove 2115 to the first pole tab 232, the connecting portion 2112 is welded to the first pole tab 232 in the area thinned by the groove 2115, which helps to reduce the difficulty of welding the connecting portion 2112 and the first pole tab 232.

[0148] According to some embodiments of the present application, as shown in FIG. 4 and FIG. 6 , the minimum width of the groove 2115 is W, satisfying W ≥ 5 mm.

[0149] In FIG. 4 , the groove 2115 is an arc-shaped groove structure, and the minimum width W of the groove 2115 is the minimum width of the cross section of the groove 2115 in its extending direction.

[0150] Exemplarily, the minimum width W of the groove 2115 may be 5 mm, 5.5 mm, 5.8 mm, 6 mm, 6.5 mm, 7 mm, 7.5 mm, 8 mm, 8.5 mm, 9 mm or 10 mm, etc.

[0151] By setting the minimum width of the groove 2115 to be greater than or equal to 5 mm, it is convenient to weld the bottom wall 2123 of the groove 2115 to the first current collecting member 25 or the first pole tab 232, which helps to reduce the difficulty of welding the area of ​​the connecting portion 2112 thinned by the groove 2115 to the first current collecting member 25 or the first pole tab 232, thereby effectively alleviating the phenomenon that the width of the groove 2115 is too small to weld the bottom wall 2123 of the groove 2115 to the first current collecting member 25 or the first pole tab 232.

[0152] In some embodiments, along the thickness direction X of the wall portion, the projected area of ​​the groove 2115 is S1, and the projected area of ​​the wall portion 211 is S2, satisfying 0.1S2≤S1≤0.5S2.

[0153] The projected area S1 of the groove 2115 is the area defined by the projection of the groove 2115 on a plane perpendicular to the wall thickness direction X. The projected area S2 of the wall portion 211 is the area defined by the projection of the entire wall portion 211 on a plane perpendicular to the wall thickness direction X.

[0154] Exemplarily, the projected area S1 of the groove 2115 may be 0.1 times, 0.12 times, 0.15 times, 0.18 times, 0.2 times, 0.25 times, 0.3 times, 0.35 times, 0.4 times, 0.45 times, or 0.5 times the projected area S2 of the wall portion 211 .

[0155] By setting the projected area of ​​the groove 2115 in the thickness direction X of the wall portion to be greater than or equal to 0.1 times the projected area of ​​the wall portion 211 in the thickness direction X of the wall portion, the area of ​​the region where the connecting portion 2112 is thinned by the groove 2115 is increased, thereby effectively increasing the area of ​​the welding connection between the connecting portion 2112 and the first current collecting member 25 or the first pole tab 232, which is beneficial to increasing the flow area between the connecting portion 2112 and the first pole tab 232. In addition, by setting the projected area of ​​the groove 2115 in the thickness direction X of the wall portion to be less than or equal to 0.5 times the projected area of ​​the wall portion 211 in the thickness direction X of the wall portion, the phenomenon of the groove 2115 occupying too much space on the wall portion 211 is alleviated. On the one hand, it is beneficial to improve the structural strength of the wall portion 211 to reduce the risk of deformation or breakage of the wall portion 211 during use. On the other hand, it can alleviate the phenomenon that there are too many protruding connecting portions 2112 in the area of ​​the first surface 2111 of the wall portion 211 corresponding to the groove 2115, thereby interfering with other components inside the battery cell 20.

[0156] According to some embodiments of the present application, referring to Figures 3 and 4, and further referring to Figure 7, which is a top view of a battery cell 20 provided in some embodiments of the present application, the groove 2115 is an arc-shaped groove extending along an arc trajectory.

[0157] The groove 2115 is an arc-shaped groove extending along an arc trajectory, that is, the extending direction of the groove 2115 is the arc trajectory line, so that the groove 2115 has an arc-shaped groove structure.

[0158] By setting the groove 2115 as an arc-shaped groove structure extending along a circular arc trajectory, it is easy to process and manufacture, and the range of the area where the groove bottom wall 2123 of the groove 2115 and the first current collecting component 25 or the first pole ear 232 are welded to each other can be expanded, thereby effectively improving the electrical connection effect between the wall portion 211 and the first pole ear 232.

[0159] In some embodiments, referring to FIG. 3 and FIG. 7 , the housing 21 is cylindrical, and the central axis of the housing 21 extends along the thickness direction X of the wall, and the central axis of the housing 21 passes through the center of the arc trajectory of the groove 2115 .

[0160] In which, the central axis of the shell 21 passes through the center of the arc trajectory of the groove 2115, that is, the center of the circle defined by the extended trajectory line of the groove 2115 is located on the central axis of the shell 21, that is, the groove 2115 is an arc-shaped structure surrounded by the central axis of the shell 21.

[0161] By setting the shell 21 as a cylindrical structure and the central axis of the shell 21 as a structure extending along the thickness direction X of the wall, the shape of the wall 211 is made circular, and by setting the central axis of the shell 21 as the center of the arc trajectory passing through the groove 2115, the groove 2115 is made into an arc-shaped groove structure arranged around the central axis of the shell 21. On the one hand, it is beneficial to improve the space utilization of the groove 2115 on the wall 211, and on the other hand, it is easy to manufacture, and can further expand the range of the area where the bottom wall 2123 of the groove 2115 and the first current collecting member 25 or the first pole ear 232 are welded to each other, so as to improve the electrical connection effect between the wall 211 and the first pole ear 232.

[0162] According to some embodiments of the present application, as shown in FIG. 6 , along the thickness direction X of the wall portion, the dimension of the connecting portion 2112 protruding from the first surface 2111 is D1, satisfying D1≤8 mm.

[0163] The dimension of the connecting portion 2112 protruding from the first surface 2111 is D1, that is, D1 is the distance between the end surface of the connecting portion 2112 facing the electrode assembly 23 in the thickness direction X of the wall and the first surface 2111.

[0164] Exemplarily, the dimension D1 of the connecting portion 2112 protruding from the first surface 2111 may be 0.1 mm, 0.2 mm, 0.5 mm, 0.8 mm, 1 mm, 1.2 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, 5.5 mm, 6 mm, 6.5 mm, 7 mm, 7.5 mm or 8 mm, etc.

[0165] By setting the size of the connecting portion 2112 protruding from the first surface 2111 to be less than or equal to 8 mm, on the one hand, the phenomenon of excessive space occupied by the connecting portion 2112 can be reduced, which is beneficial to improving the internal space utilization of the battery cell 20; on the other hand, the interference effect of the connecting portion 2112 on the electrical connection between the electrode terminal 22 and the second tab 233 can be reduced.

[0166] It should be noted that the connection portion 2112 provided on the first surface 2111 of the wall portion 211 can be one or more. For example, in Figures 6 and 7, only one connection portion 2112 is protruding from the first surface 2111. Correspondingly, a groove 2115 having the same shape as the connection portion 2112 is formed on the second surface 2114. Of course, the structure of the battery cell 20 is not limited to this. In some embodiments, please refer to Figure 8, which is a top view of the battery cell 20 provided in some other embodiments of the present application. Multiple connection portions 2112 are protruding from the first surface 2111. Correspondingly, multiple grooves 2115 having the same shape as the connection portion 2112 are formed on the second surface 2114.

[0167] For example, in FIG8 , two grooves 2115 are formed on the second surface 2114 of the wall portion 211 , and the two grooves 2115 are arranged at intervals along a circular arc trajectory with the central axis of the housing 21 as the center. Correspondingly, two connecting portions 2112 are protruding from the first surface 2111 .

[0168] By protruding multiple connecting portions 2112 on the first surface 2111 of the wall portion 211, the wall portion 211 can be electrically connected to the first pole tab 232 through the multiple connecting portions 2112, which is beneficial to improving the effect of mutual electrical connection between the wall portion 211 and the first pole tab 232, and can increase the flow area between the wall portion 211 and the first pole tab 232.

[0169] According to some embodiments of the present application, as shown in Figures 5 and 6, the wall portion 211 is provided with an assembly hole 2113, and the assembly hole 2113 passes through the wall portion 211 along the thickness direction X of the wall portion. The electrode terminal 22 is arranged in the assembly hole 2113 and protrudes from the first surface 2111.

[0170] Among them, the electrode terminal 22 is inserted into the assembly hole 2113 of the wall portion 211, and the electrode terminal 22 protrudes from the first surface 2111. That is, in the thickness direction X of the wall portion, the end of the electrode terminal 22 close to the electrode assembly 23 extends out of the assembly hole 2113 and exceeds the first surface 2111, so that the end face of the electrode terminal 22 facing the electrode assembly 23 is arranged at intervals from the first surface 2111.

[0171] By setting the electrode terminal 22 as a structure protruding from the first surface 2111 in the thickness direction X of the wall portion, so as to facilitate electrical connection between the electrode terminal 22 and the second pole ear 233, it is beneficial to reduce the difficulty of electrical connection between the electrode terminal 22 and the second pole ear 233, and the connecting portion 2112 protruding from the first surface 2111 of the wall portion 211 can compensate for the height difference between the end surface of the electrode terminal 22 facing the electrode assembly 23 and the first surface 2111 of the wall portion 211, thereby effectively improving the electrical connection effect between the electrode terminal 22 and the second pole ear 233 while achieving electrical connection between the wall portion 211 and the first pole ear 232.

[0172] In some embodiments, as shown in FIG. 6 , along the thickness direction X of the wall, the dimension of the connection portion 2112 protruding from the first surface 2111 is D1 , and the dimension of the electrode terminal 22 protruding from the first surface 2111 is D2 , satisfying D1 = D2 .

[0173] Among them, D1=D2, that is, the height of the connecting portion 2112 protruding from the first surface 2111 is equal to the height of the electrode terminal 22 protruding from the first surface 2111, so that in the thickness direction X of the wall, the end face of the connecting portion 2112 facing the electrode assembly 23 is flush with the end face of the electrode terminal 22 facing the electrode assembly 23.

[0174] By setting the size of the connecting portion 2112 protruding from the first surface 2111 to be the same as the size of the electrode terminal 22 protruding from the first surface 2111, the end surface of the connecting portion 2112 facing the electrode assembly 23 and the end surface of the electrode terminal 22 facing the electrode assembly 23 are flush with each other in the thickness direction X of the wall portion. On the one hand, the difficulty of electrical connection between the connecting portion 2112 and the first pole ear 232 and between the electrode terminal 22 and the second pole ear 233 can be reduced. On the other hand, the mutual influence between the connecting portion 2112 and the electrode terminal 22 can be reduced, which may cause poor electrical connection between the connecting portion 2112 and the first pole ear 232 or between the electrode terminal 22 and the second pole ear 233.

[0175] According to some embodiments of the present application, as shown in Figures 4, 5, and 6, the battery cell 20 may further include a first current collecting member 25 and a second current collecting member 26. The first current collecting member 25 is located between the connecting portion 2112 and the first electrode tab 232, connecting the connecting portion 2112 and the first electrode tab 232. The second current collecting member 26 is located between the electrode terminal 22 and the second electrode tab 233, spaced apart from the first current collecting member 25, and connecting the electrode terminal 22 and the second electrode tab 233.

[0176] The first current collecting member 25 is disposed between the connecting portion 2112 and the first electrode tab 232 along the thickness direction X of the wall portion, and both sides of the first current collecting member 25 are connected to the connecting portion 2112 and the first electrode tab 232 respectively to achieve electrical connection between the first electrode tab 232 and the wall portion 211 .

[0177] Optionally, the connection structure between the first current collecting member 25 and the first electrode tab 232 may be various, such as welding or abutting. Similarly, the connection structure between the first current collecting member 25 and the connecting portion 2112 may be various, such as welding or abutting.

[0178] The first current collecting member 25 electrically connects the first electrode tab 232 and the connecting portion 2112 of the wall portion 211 . The first current collecting member 25 can be made of various materials, for example, copper, iron, aluminum, steel, or aluminum alloy.

[0179] Similarly, along the thickness direction X of the wall portion, the second current collecting member 26 is arranged between the electrode terminal 22 and the second electrode tab 233, and both sides of the second current collecting member 26 are respectively connected to the electrode terminal 22 and the second electrode tab 233 to achieve electrical connection between the second electrode tab 233 and the electrode terminal 22.

[0180] Optionally, the second current collecting member 26 and the second electrode tab 233 may be connected in various ways, such as welding or abutting. Similarly, the second current collecting member 26 and the electrode terminal 22 may be connected in various ways, such as welding or abutting.

[0181] The second current collecting member 26 serves to electrically connect the second electrode tab 233 and the electrode terminal 22 . The second current collecting member 26 can be made of various materials, for example, copper, iron, aluminum, steel, or aluminum alloy.

[0182] For example, in FIG5 , the first current collecting member 25 and the second current collecting member 26 have the same thickness in the thickness direction X of the wall portion, and the height of the connecting portion 2112 protruding from the first surface 2111 is equal to the height of the electrode terminal 22 protruding from the first surface 2111, so that the first current collecting member 25 is connected to the wall portion 211 through the connecting portion 2112, and the second current collecting member 26 is connected to the electrode terminal 22.

[0183] By disposing the first current collecting member 25 between the connecting portion 2112 of the wall portion 211 and the first electrode tab 232, and by connecting the connecting portion 2112 and the first electrode tab 232, the electrical connection between the first electrode tab 232 and the wall portion 211 is achieved. This helps reduce the difficulty of electrically connecting the first electrode tab 232 and the connecting portion 2112. Similarly, by disposing the second current collecting member 26 between the electrode terminal 22 and the second electrode tab 233, and by connecting the electrode terminal 22 and the second electrode tab 233, the electrical connection between the second electrode tab 233 and the electrode terminal 22 is achieved. This helps reduce the difficulty of electrically connecting the second electrode tab 233 and the electrode terminal 22. Furthermore, by spacing the first current collecting member 25 and the second current collecting member 26, short circuits between the first and second current collecting members 25 and 26 are reduced, thereby reducing the risks associated with the use of the battery cell 20.

[0184] According to some embodiments of the present application, as shown in Figures 5 and 6, along the thickness direction X of the wall portion, the first current collecting member 25 has a third surface 251 facing the wall portion 211, and the third surface 251 is connected to the connecting portion 2112. The second current collecting member 26 has a fourth surface 261 facing the wall portion 211, and the fourth surface 261 is connected to the electrode terminal 22. The third surface 251 and the fourth surface 261 are flush.

[0185] Among them, the third surface 251 and the fourth surface 261 are flush, that is, in the thickness direction X of the wall portion, the distance between the first current collecting member 25 and the first surface 2111 of the wall portion 211 is equal to the distance between the second current collecting member 26 and the first surface 2111 of the wall portion 211, so that the height of the connecting portion 2112 protruding from the first surface 2111 is equal to the height of the electrode terminal 22 protruding from the first surface 2111, so as to improve the connection quality between the first current collecting member 25 and the connecting portion 2112 and between the second current collecting member 26 and the electrode terminal 22.

[0186] By setting the third surface 251 of the first current collecting member 25 to be flush with the fourth surface 261 of the second current collecting member 26, on the one hand, it is convenient to assemble the first current collecting member 25 and the second current collecting member 26, which is conducive to reducing the difficulty of assembling the first current collecting member 25 and the second current collecting member 26 between the wall portion 211 and the electrode assembly 23. On the other hand, the connecting portion 2112 set on the first surface 2111 of the wall portion 211 can compensate for the gap between the first current collecting member 25 and the wall portion 211, so that the first current collecting member 25 can be electrically connected to the wall portion 211, and the contact effect between the first current collecting member 25 and the wall portion 211 can be improved.

[0187] In some embodiments, please continue to refer to Figures 5 and 6. Along the thickness direction X of the wall portion, the first electrode tab 232 has a fifth surface 2321 facing the wall portion 211, the first current collecting member 25 is connected to the fifth surface 2321, the second electrode tab 233 has a sixth surface 2331 facing the wall portion 211, the second current collecting member 26 is connected to the sixth surface 2331, and the fifth surface 2321 is flush with the sixth surface 2331.

[0188] Among them, the fifth surface 2321 is flush with the sixth surface 2331, that is, in the thickness direction X of the wall portion, the distance between the first electrode tab 232 and the first surface 2111 of the wall portion 211 is equal to the distance between the second electrode tab 233 and the first surface 2111 of the wall portion 211. Therefore, in an embodiment where the third surface 251 of the first current collecting member 25 and the fourth surface 261 of the second current collecting member 26 are flush with each other, the thickness of the first current collecting member 25 and the second current collecting member 26 can be equal and flush with each other.

[0189] By setting the fifth surface 2321 of the first pole tab 232 facing the wall portion 211 and the sixth surface 2331 of the second pole tab 233 facing the wall portion 211 to be flush with each other, on the one hand, it is convenient to process the first pole tab 232 and the second pole tab 233, and on the other hand, it can achieve a mutually flush structure of the first current collecting member 25 and the second current collecting member 26 on the side facing the electrode assembly 23 in the thickness direction X of the wall, so as to reduce the position difference between the first current collecting member 25 and the second current collecting member 26 in the thickness direction X of the wall, thereby reducing the difficulty of assembling the first current collecting member 25 and the second current collecting member 26 between the electrode assembly 23 and the wall portion 211, and improving the internal space utilization of the battery cell 20.

[0190] According to some embodiments of the present application, referring to Figures 4 and 5, and further referring to Figures 9 and 10, Figure 9 is a schematic diagram illustrating the connection of the first current collecting member 25 and the second current collecting member 26 of the battery cell 20 provided in some embodiments of the present application, and Figure 10 is a schematic diagram illustrating the structure of the first insulating member 28 of the battery cell 20 provided in some embodiments of the present application. The battery cell 20 may further include a first insulating member 28, which is disposed between the electrode assembly 23 and the wall portion 211. The first insulating member 28 insulates and separates the first current collecting member 25 from the second current collecting member 26.

[0191] The first insulating member 28 provides insulation for the first current collecting member 25 and the second current collecting member 26 . The first insulating member 28 may be made of rubber, silicone, plastic, or the like.

[0192] The first insulating member 28 insulates and isolates the first current collecting member 25 and the second current collecting member 26. That is, at least a portion of the first insulating member 28 is located between the first current collecting member 25 and the second current collecting member 26 so that the first current collecting member 25 and the second current collecting member 26 do not contact each other. That is, the first insulating member 28 can separate the first current collecting member 25 and the second current collecting member 26.

[0193] By arranging a first insulating member 28 between the electrode assembly 23 and the wall portion 211, and the first insulating member 28 is used to insulate and isolate the first current collecting member 25 and the second current collecting member 26, it is possible to achieve insulation isolation between the first current collecting member 25 and the second current collecting member 26, which is beneficial to further reduce the risk of short circuit between the first current collecting member 25 and the second current collecting member 26.

[0194] In some embodiments, please continue to refer to Figures 4, 5, 9 and 10, the first insulating member 28 is provided with first mounting holes 281 and second mounting holes 282 arranged at intervals, the first current collecting component 25 is provided in the first mounting hole 281, and the second current collecting component 26 is provided in the second mounting hole 282.

[0195] Among them, the first insulating member 28 is provided with a first mounting hole 281 and a second mounting hole 282 arranged at intervals, that is, the first mounting hole 281 and the second mounting hole 282 provided on the first insulating member 28 do not contact each other, so that the first insulating member 28 can also provide an assembly function for the first current collecting member 25 and the second current collecting member 26. As shown in Figure 10, the first mounting hole 281 and the second mounting hole 282 are both structures that pass through both sides of the first insulating member 28 in the thickness direction X of the wall.

[0196] For example, the first current collecting component 25 is snapped into the first mounting hole 281. Of course, in other embodiments, the first current collecting component 25 can also be connected to the first mounting hole 281 by bonding or bolting. Similarly, the second current collecting component 26 is snapped into the second mounting hole 282. Of course, in other embodiments, the second current collecting component 26 can also be connected to the second mounting hole 282 by bonding or bolting.

[0197] By providing the first mounting holes 281 and the second mounting holes 282 arranged at intervals on the first insulating member 28, and the first current collecting member 25 and the second current collecting member 26 being respectively provided in the first mounting holes 281 and the second mounting holes 282, on the one hand, the first current collecting member 25 and the second current collecting member 26 can be assembled to the first insulating member 28, so that the first insulating member 28 can support and assemble the first current collecting member 25 and the second current collecting member 26, which is conducive to reducing the difficulty of arranging the first current collecting member 25 and the second current collecting member 26 between the wall portion 211 and the electrode assembly 23. On the other hand, the first current collecting member 25 and the second current collecting member 26 can be arranged at intervals on the first insulating member 28 to achieve insulation isolation between the first current collecting member 25 and the second current collecting member 26.

[0198] 9 and 10 , the first insulating member 28 may include a first insulator 283 and a second insulator 284. The first insulator 283 is an annular structure, and the second insulator 284 is connected to the first insulator 283. The second insulator 284 is configured to separate the interior space of the first insulator 283 into a first mounting hole 281 and a second mounting hole 282. The second insulator 284 is located between the first current collecting member 25 and the second current collecting member 26.

[0199] Among them, the first insulator 283 is a ring structure, that is, the first insulator 283 is a ring structure connected end to end. The shape of the first insulator 283 can be various. For example, referring to Figures 9 and 10, the first insulator 283 is a circular ring structure, and the first insulator 283 surrounds the outside of the first current collecting component 25 and the second current collecting component 26. That is, the first insulator 283 is a ring structure, and the first current collecting component 25 and the second current collecting component 26 are both located on the inner side of the first insulator 283.

[0200] The second insulator 284 is connected to the first insulator 283. The second insulator 284 is configured to separate the internal space of the first insulator 283 into a first mounting hole 281 and a second mounting hole 282. The second insulator 284 is located between the first current collecting member 25 and the second current collecting member 26. That is, the second insulator 284 is located on the inner side of the first insulator 283, and both ends of the second insulator 284 are connected to the inner circumferential surface of the first insulator 283 to separate the internal space of the first insulator 283 into two assembly spaces, namely the first mounting hole 281 and the second mounting hole 282.

[0201] Optionally, the first insulator 283 and the second insulator 284 can be an integrally formed structure or a separately provided structure. For example, in FIG10 , the first insulator 283 and the second insulator 284 are an integrally formed structure, and the first insulator 283 and the second insulator 284 can be manufactured by an integral molding process such as injection molding, stamping, or extrusion molding.

[0202] The first insulating member 28 is provided with a first insulator 283 of an annular structure and a second insulator 284 connected to the inner side of the first insulator 283, and the second insulator 284 is configured to divide the internal space of the first insulator 283 into a first mounting hole 281 and a second mounting hole 282, so that the first insulator 283 and the second insulator 284 jointly define the first mounting hole 281 and the second mounting hole 282 for assembling the first current collecting member 25 and the second current collecting member 26. The first insulating member 28 with such a structure can, on the one hand, surround the outer sides of the first current collecting member 25 and the second current collecting member 26 through the first insulator 283, so that the first current collecting member 25 and the second current collecting member 26 can be separated from the outer shell 21, which is beneficial to reducing the risk of short circuit between the first current collecting member 25 and the second current collecting member 26 and the outer shell 21. On the other hand, the first current collecting member 25 and the second current collecting member 26 can be separated by the second insulator 284, which is beneficial to reducing the risk of short circuit between the first current collecting member 25 and the second current collecting member 26.

[0203] According to some embodiments of the present application, as shown in FIG. 3 , FIG. 4 and FIG. 5 , the housing 21 is cylindrical, and the central axis of the housing 21 extends along the thickness direction X of the wall.

[0204] The housing 21 is cylindrical, and correspondingly, the end cover 213 is a circular plate structure, so that the battery cell 20 is cylindrical. Similarly, the main body 231 of the electrode assembly 23 is also cylindrical.

[0205] By setting the shell 21 to be cylindrical, it is easy to process and form the battery cell 20 with a cylindrical structure, so that the battery cell 20 has the advantages of high capacity, long cycle life, and a wide range of operating ambient temperatures.

[0206] According to some embodiments of the present application, as shown in Figures 3, 4, and 5, the housing 21 may include a shell 212 and an end cap 213. The shell 212 includes a side wall 2122 and a wall portion 211. The side wall 2122 is arranged around the wall portion 211. Along the thickness direction X of the wall portion, one end of the side wall 2122 is connected to the wall portion 211, and the other end is enclosed to form an opening 2121. The side wall 2122 and the wall portion 211 jointly define a housing cavity for accommodating the electrode assembly 23. The end cap 213 closes the opening 2121.

[0207] The side wall 2122 is disposed around the wall portion 211. Along the wall portion's thickness direction X, one end of the side wall 2122 is connected to the wall portion 211, and the other end encloses an opening 2121. In other words, the wall portion 211 is the bottom wall 2123 of the housing 212, which is disposed opposite the end cap 213 along the wall portion's thickness direction X. Correspondingly, the end cap 213 covers the opening 2121 at the end of the side wall 2122 away from the wall portion 211.

[0208] Optionally, the sidewall 2122 and wall portion 211 of the housing 212 can be separate structures or an integral structure. For example, in FIG4 , the sidewall 2122 and wall portion 211 of the housing 212 are integrally formed. The housing 212 can be manufactured using an integral molding process such as stamping, casting, or extrusion. In embodiments where the sidewall 2122 and wall portion 211 of the housing 212 are separate structures, the wall portion 211 can be connected to the end away from the end cap 213 by welding, bonding, or snap-fitting.

[0209] By setting the wall portion 211 of the outer shell 21 as the bottom wall 2123 arranged opposite to the shell 212 and the end cover 213, the wall portion 211 where the electrode terminal 22 is set and used to be electrically connected to the first pole ear 232 can be kept away from the end cover 213, thereby reducing the stress generated when the end cover 213 and the shell 212 are connected to each other and causing the impact on the wall portion 211 or the electrode terminal 22 arranged on the wall portion 211, which is beneficial to improving the reliability and service life of the battery cell 20.

[0210] It should be noted that the structure of the battery cell 20 is not limited to this. In some embodiments, the battery cell 20 may also have other structures. For example, the outer shell 21 may include a shell 212 and an end cap 213. The shell 212 has an interior forming a receiving cavity with an opening 2121 for receiving the electrode assembly 23. The end cap 213 closes the opening 2121 and is a wall portion 211. In other words, the electrode terminal 22 is insulated and mounted on the end cap 213, and a connecting portion 2112 is provided on the side of the end cap 213 facing the electrode assembly 23.

[0211] By setting the wall portion 211 of the outer shell 21 as the end cover 213 of the outer shell 21 for closing the opening 2121 of the shell 212, the battery cell 20 adopting this structure is convenient for assembling the electrode terminal 22 on the end cover 213, and can reduce the difficulty of electrically connecting the first pole ear 232 and the second pole ear 233 with the end cover 213 and the electrode terminal 22 respectively, thereby helping to reduce the manufacturing difficulty of the battery cell 20 and improve the production efficiency of the battery cell 20.

[0212] According to some embodiments of the present application, the present application further provides a battery 100 , which includes the battery cell 20 of any of the above solutions.

[0213] As shown in FIG. 2 , the battery 100 may further include a box body 10 , in which the battery cells 20 are accommodated.

[0214] In some embodiments, the box body 10 may include a first box body 11 and a second box body 12 . The first box body 11 and the second box body 12 cover each other, and the first box body 11 and the second box body 12 jointly define an assembly space for accommodating the battery cells 20 .

[0215] Optionally, the second box body 12 can be a hollow structure with one end open, and the first box body 11 can be a plate-like structure, and the first box body 11 covers the open side of the second box body 12, so that the first box body 11 and the second box body 12 jointly define an assembly space; the first box body 11 and the second box body 12 can also be hollow structures with one side open, and the open side of the first box body 11 covers the open side of the second box body 12.

[0216] Of course, the box body 10 formed by the first box body 11 and the second box body 12 can be in various shapes, such as a cylinder or a rectangular parallelepiped, etc. For example, in FIG2 , the box body 10 is a rectangular parallelepiped structure.

[0217] Optionally, the number of battery cells 20 disposed within the housing 10 may be one or more. For example, in FIG2 , the housing 10 of the battery 100 includes multiple battery cells 20, 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 in both series and 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 comprise multiple battery cells 20 that are first connected in series, in parallel, or in a hybrid configuration to form a battery module, which is then further connected in series, in parallel, or in a hybrid configuration to form a single structure, which is then housed within the housing 10.

[0218] The battery 100 may further include other structures. For example, the battery 100 may further include a busbar component that connects the plurality of battery cells 20 to achieve electrical connection between the plurality of battery cells 20 .

[0219] It should be noted that in some embodiments, the battery 100 may not be provided with a housing 10. The battery 100 includes multiple battery cells 20, and the battery 100 composed of multiple battery cells 20 can be directly assembled on an electrical device to provide electrical energy to the electrical device through the multiple battery cells 20. In other words, the housing 10 can serve as part of the electrical device. Taking the vehicle 1000 as an example, the housing 10 can serve as part of the chassis structure of the vehicle 1000. For example, a portion of the housing 10 can form at least a portion of the floor of the vehicle 1000, or a portion of the housing 10 can form at least a portion of the crossbeam and longitudinal beam of the vehicle 1000.

[0220] According to some embodiments of the present application, the present application further provides an electrical device, which includes the battery cell 20 of any of the above solutions, and the battery cell 20 is used to provide electrical energy to the electrical device.

[0221] The electrical device may be any of the aforementioned devices or systems using the battery cell 20 .

[0222] According to some embodiments of the present application, as shown in Figures 3 to 7 and Figures 9 to 10, the present application provides a battery cell 20, which includes a housing 21, electrode terminals 22, an electrode assembly 23, a first current collecting member 25, a second current collecting member 26, and a first insulating member 28. The housing 21 includes a shell 212 and an end cap 213. The housing 21 has a wall portion 211. The shell 212 includes side walls 2122 and a bottom wall 2123. The side walls 2122 are arranged around the bottom wall 2123. Along the thickness direction X of the wall portion, one end of the side walls 2122 is connected to the bottom wall 2123, and the other end encloses an opening 2121. The side walls 2122 and the bottom wall 2123 jointly define a receiving cavity. The bottom wall 2123 is the wall portion 211, and the end cap 213 closes the opening 2121. Along the thickness direction X of the wall portion, the wall portion 211 has a first surface 2111 facing the accommodating cavity and a second surface 2114 facing away from the accommodating cavity. A connecting portion 2112 is protruding from the first surface 2111, and a groove 2115 is formed on the second surface 2114 at a position corresponding to the connecting portion 2112. The shape of the groove 2115 is the same as that of the connecting portion 2112. The minimum width of the groove 2115 is W, satisfying W ≥ 5 mm. Along the thickness direction X of the wall portion, the projected area of ​​the groove 2115 is S1, and the projected area of ​​the wall portion 211 is S2, satisfying 0.1S2 ≤ S1 ≤ 0.5S2. The groove 2115 is an arc-shaped groove extending along a circular arc trajectory. The shell 21 is cylindrical, and the central axis of the shell 21 extends along the thickness direction X of the wall portion. The central axis of the shell 21 passes through the center of the circular arc trajectory of the groove 2115. Along the wall's thickness direction (X), the dimension D1 of the connecting portion 2112 protruding from the first surface 2111 satisfies D1 ≤ 8 mm. The electrode terminal 22 is insulated and mounted on the wall 211. The wall 211 is provided with an assembly hole 2113. The assembly hole 2113 extends through the wall 211 along the wall's thickness direction (X). The electrode terminal 22 is disposed within the assembly hole 2113 and protrudes from the first surface 2111. The dimension D1 of the connecting portion 2112 protruding from the first surface 2111 is the same as the dimension D2 of the electrode terminal 22 protruding from the first surface 2111. D1 = D2. The electrode assembly 23 is housed within the housing 21. It includes a main body 231, a first electrode tab 232, and a second electrode tab 233. The main body 231 is cylindrical, with its central axis extending along the wall thickness direction X. The first electrode tab 232 and the second electrode tab 233 have opposite polarities. Along the wall thickness direction X, the first electrode tab 232 and the second electrode tab 233 are both located at the end of the main body 231 facing the wall 211. A first current collecting member 25 is located between the connecting portion 2112 and the first electrode tab 232. The bottom wall 2123 of the groove 2115 is welded to the first current collecting member 25. The first current collecting member 25 is connected to the first electrode tab 232, thereby electrically connecting the first electrode tab 232 to the wall 211.The second current collecting member 26 is located between the electrode terminal 22 and the second electrode tab 233. The second current collecting member 26 is spaced apart from the first current collecting member 25. The second current collecting member 26 connects the electrode terminal 22 and the second electrode tab 233 to electrically connect the electrode terminal 22 and the second electrode tab 233. Along the thickness direction X of the wall portion, the first current collecting member 25 has a third surface 251 facing the wall portion 211. The third surface 251 is connected to the connecting portion 2112. The second current collecting member 26 has a fourth surface 261 facing the wall portion 211. The fourth surface 261 is connected to the electrode terminal 22. The third surface 251 and the fourth surface 261 are flush. Along the thickness direction X of the wall portion, the first electrode tab 232 has a fifth surface 2321 facing the wall portion 211, and the first current collecting member 25 is connected to the fifth surface 2321. The second electrode tab 233 has a sixth surface 2331 facing the wall portion 211, and the second current collecting member 26 is connected to the sixth surface 2331. The fifth surface 2321 is flush with the sixth surface 2331. The first insulating member 28 is arranged between the electrode assembly 23 and the wall portion 211. The first insulating member 28 includes a first insulator 283 and a second insulator 284. The first insulator 283 is a ring structure. The second insulator 284 is connected to the first insulator 283. The second insulator 284 is configured to separate the internal space of the first insulator 283 into a first mounting hole 281 and a second mounting hole 282. The first current collecting member 25 is arranged in the first mounting hole 281, and the second current collecting member 26 is arranged in the second mounting hole 282. The first insulator 283 surrounds the outside of the first current collecting member 25 and the second current collecting member 26, and the second insulator 284 is located between the first current collecting member 25 and the second current collecting member 26.

[0223] 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.

[0224] The above are merely preferred embodiments of the present application and are not intended to limit the present application. Those skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A battery cell, comprising: a housing having a wall portion; an electrode terminal, insulated and mounted on the wall; as well as an electrode assembly, contained in the housing, comprising a main body, a first electrode tab and a second electrode tab, wherein the first electrode tab and the second electrode tab have opposite polarities, and along the thickness direction of the wall portion, the first electrode tab and the second electrode tab are both arranged at one end of the main body facing the wall portion; Wherein, along the thickness direction of the wall portion, the wall portion has a first surface facing the electrode assembly and a second surface away from the first surface, a connecting portion is convexly provided on the first surface, a groove is formed on the second surface corresponding to the position of the connecting portion, the connecting portion is electrically connected to the first electrode tab, and the electrode terminal is electrically connected to the second electrode tab; The battery cell further includes a first current collecting member, the first current collecting member is connected to the first pole lug, the bottom wall of the groove is welded to the first current collecting member to electrically connect the first pole lug and the wall portion, or the bottom wall of the groove is welded to the first pole lug to electrically connect the first pole lug and the wall portion; Along the thickness direction of the wall portion, the projection area of ​​the groove is S1, and the projection area of ​​the wall portion is S2, satisfying 0.1S2≤S1≤0.5S2.

2. The battery cell according to claim 1, wherein: The minimum width of the groove is W, satisfying that W≥5mm.

3. The battery cell according to claim 1 or 2, wherein: The groove is an arc-shaped groove extending along a circular arc track.

4. The battery cell according to claim 3, wherein: The shell is cylindrical, and the central axis of the shell extends along the thickness direction of the wall portion, and the central axis of the shell passes through the center of the arc track of the groove.

5. The battery cell according to any one of claims 1 to 4, wherein: Along the thickness direction of the wall portion, a dimension D1 of the connecting portion protruding from the first surface satisfies D1≤8 mm.

6. The battery cell according to any one of claims 1 to 5, wherein: A plurality of the connecting parts are protrudingly disposed on the first surface.

7. The battery cell according to any one of claims 1 to 6, wherein: The wall portion is provided with an assembly hole, and the assembly hole penetrates the wall portion along the thickness direction of the wall portion. The electrode terminal is arranged in the assembly hole and protrudes from the first surface.

8. The battery cell according to claim 7, wherein: Along the thickness direction of the wall portion, the dimension of the connecting portion protruding from the first surface is D1, and the dimension of the electrode terminal protruding from the first surface is D2, satisfying D1=D2.

9. The battery cell according to any one of claims 1 to 8, wherein: The battery cell further comprises: A first current collecting member, located between the connecting portion and the first electrode tab, the first current collecting member connecting the connecting portion and the first electrode tab; The second current collecting member is located between the electrode terminal and the second electrode tab. The second current collecting member is spaced apart from the first current collecting member and connects the electrode terminal and the second electrode tab.

10. The battery cell according to claim 9, wherein: Along the thickness direction of the wall portion, the first current collecting member has a third surface facing the wall portion, the third surface is connected to the connection portion, and the second current collecting member has a fourth surface facing the wall portion, the fourth surface is connected to the electrode terminal; Wherein, the third surface and the fourth surface are flush.

11. The battery cell according to claim 9 or 10, wherein: Along the thickness direction of the wall portion, the first electrode tab has a fifth surface facing the wall portion, the first current collecting member is connected to the fifth surface, the second electrode tab has a sixth surface facing the wall portion, the second current collecting member is connected to the sixth surface; Wherein, the fifth surface is flush with the sixth surface.

12. The battery cell according to any one of claims 9 to 11, wherein: The battery cell further comprises: A first insulating member is disposed between the electrode assembly and the wall portion, and the first insulating member insulates and isolates the first current collecting member from the second current collecting member.

13. The battery cell according to claim 12, wherein: The first insulating member is provided with a first mounting hole and a second mounting hole arranged at intervals, the first current collecting member is provided in the first mounting hole, and the second current collecting member is provided in the second mounting hole.

14. The battery cell according to claim 13, wherein: The first insulating member comprises: The first insulator is a ring-shaped structure; The second insulator is connected to the first insulator, the second insulator is configured to divide the inner space of the first insulator into the first mounting hole and the second mounting hole, and the second insulator is located between the first current collecting member and the second current collecting member.

15. The battery cell according to any one of claims 1 to 14, wherein: The shell is cylindrical, and the central axis of the shell extends along the thickness direction of the wall portion.

16. The battery cell according to any one of claims 1 to 15, wherein: The housing comprises: A shell, comprising a side wall and the wall portion, wherein the side wall is arranged around the wall portion, along the thickness direction of the wall portion, one end of the side wall is connected to the wall portion, and the other end is enclosed to form an opening, and the side wall and the wall portion jointly define a housing cavity for housing the electrode assembly; An end cap closes the opening.

17. The battery cell according to any one of claims 1 to 15, wherein: The housing comprises: A shell body, wherein a receiving cavity with an opening is formed inside, and the receiving cavity is used to receive the electrode assembly; an end cap for closing the opening; Wherein, the end cover is the wall portion.

18. A battery comprising the battery cell according to any one of claims 1 to 17.

19. An electrical device, comprising the battery cell according to any one of claims 1 to 17, wherein the battery cell is used to provide electrical energy.

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