Battery cell, battery, and electrical device

Abstract

The present application discloses a battery cell, a battery and an electrical device. The battery cell comprises a casing, an electrode terminal, an electrode assembly, and a first current collecting component. The casing has a first wall. The electrode terminal is insulated from and mounted on the first wall. The electrode assembly is accommodated in the casing; the electrode assembly comprises a main body part, a first tab and a second tab; the polarities of the first tab and the second tab are opposite; in the thickness direction of the first wall, the first tab and the second tab are both arranged at the end of the main body part facing the first wall; and the second tab is electrically connected to the electrode terminal. The first current collecting component comprises a current collecting body and a protruding part, the current collecting body is connected to the first tab, the protruding part protrudes from the side of the current collecting body facing away from the first tab, and the protruding part is connected to the first wall. The technical solution provided by the present application can improve the reliability of batteries.

Description

Battery cells, batteries and electrical devices

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent application No. 202311186301.3, 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] Energy conservation and emission reduction are key to the sustainable development of the automotive industry. Electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of the sustainable development of the automotive industry. For electric vehicles, battery technology is a key factor in their development.

[0005] In the development of battery technology, how to improve battery reliability is a technical problem that needs to be solved urgently.

[0006] Summary of the Invention

[0007] The present application provides a battery cell, a battery, and an electrical device. The technical solution provided in the present application can improve the reliability of the battery.

[0008] This application is achieved through the following technical solutions:

[0009] In a first aspect, the present application provides a battery cell comprising a housing, an electrode terminal, an electrode assembly, and a first current collecting member. The housing has a first wall. The electrode terminal is insulated and mounted to the first wall. The electrode assembly is housed within the housing, and comprises a main body, a first electrode tab, and a second electrode tab. The first electrode tab and the second electrode tab have opposite polarities and are both disposed at one end of the main body facing the first wall along the thickness direction of the first wall. The second electrode tab is electrically connected to the electrode terminal. The first current collecting member comprises a current collecting body and a protrusion. The current collecting body is connected to the first electrode tab. The protrusion protrudes from a side of the current collecting body facing away from the first electrode tab and is connected to the first wall.

[0010] In the above technical solution, by arranging both the first and second tabs of the electrode assembly on the same end surface of the main body, the space occupied by the electrode assembly in the direction from the electrode assembly to the first wall is reduced, thereby improving the energy density of the battery cell having such an electrode assembly. Furthermore, by providing a protrusion on the current collecting body and connecting the protrusion to the first wall, this not only facilitates the connection between the first current collecting member and the first tab, but also reduces the risk of internal short circuits in the battery cell due to failure in the connection between the first wall and the first current collecting member. Furthermore, compared to solutions that make the current collecting body thicker overall, this effectively reduces the material cost and weight of the first current collecting member, thereby improving the battery's weight energy density and, in turn, enhancing the battery's reliability.

[0011] According to some embodiments of the present application, the protrusion includes a top wall and a side wall, the top wall is connected to the first wall, the side wall is connected to the top wall and the current collecting body, and the top wall and the side wall form a cavity.

[0012] In the above technical solution, the top wall is connected to the current collector body via the side wall, allowing the top wall to protrude from the current collector body and connect to the first wall, thereby achieving electrical connection between the first tab and the first wall. The cavity formed by the top wall and the side wall can be understood as a cavity between the top wall and the side wall. Therefore, compared to a solid protrusion, this effectively reduces the weight of the protrusion and improves the battery's gravimetric energy density. Furthermore, the top wall can be thinner, facilitating welding between the first wall and the top wall, thereby improving battery manufacturing efficiency.

[0013] According to some embodiments of the present application, the side walls are arranged around the top wall.

[0014] In the above technical solution, by setting the side walls to surround the top wall, the supporting effect of the side walls on the top wall can be improved, reducing the risk of the top wall collapsing toward the current collecting body, and facilitating the effective connection of the top wall with the first wall, thereby reducing the risk of internal short circuit of the battery cell due to failure of the connection between the top wall and the first wall, thereby making the battery have higher reliability.

[0015] According to some embodiments of the present application, the side wall includes a first side wall and a second side wall that are oppositely arranged, the first side wall connects the top wall and the current collecting body, and the second side wall connects the top wall and the current collecting body.

[0016] In the above technical solution, the top wall is jointly supported by the relatively arranged first side wall and the second side wall, which can improve the supporting effect of the side wall on the top wall, reduce the risk of the top wall collapsing toward the current collecting body, and facilitate the effective connection of the top wall with the first wall, thereby reducing the risk of internal short circuit of the battery cell due to failure of the connection between the top wall and the first wall, thereby making the battery have higher reliability.

[0017] According to some embodiments of the present application, the sidewall further includes a third sidewall, the third sidewall connects the top wall and the current collecting body, and the third sidewall connects the first sidewall and the second sidewall.

[0018] In the above technical solution, by setting a third side wall to connect the top wall and the current collecting body, the supporting effect of the side wall on the top wall can be improved, the risk of the top wall collapsing toward the current collecting body can be reduced, and the top wall is effectively connected to the first wall; at the same time, the third side wall connects the first side wall and the second side wall, which can further improve the supporting effect of the side wall on the top wall, thereby reducing the risk of internal short circuit of the battery cell due to failure of the connection between the top wall and the first wall, thereby making the battery have higher reliability.

[0019] According to some embodiments of the present application, the electrode assembly is cylindrical, the protrusion extends along the circumference of the electrode assembly, and the first side wall and the second side wall are arranged opposite to each other along the radial direction of the electrode assembly.

[0020] In the above technical solution, the protrusion extends along the circumference of the electrode assembly, effectively utilizing the space between the electrode assembly and the first wall, resulting in a larger contact area between the protrusion and the first wall, which is beneficial for improving the current carrying capacity of the battery cell. Furthermore, by arranging the first and second side walls to be spaced apart from each other in the radial direction of the electrode assembly, the support effect of the side walls on the top wall can be improved, reducing the risk of the top wall's end in the radial direction of the electrode assembly collapsing toward the current collecting member, thereby reducing the risk of internal short circuits in the battery cell due to failure of the connection between the top wall and the first wall, thereby improving the reliability of the battery.

[0021] According to some embodiments of the present application, the electrode assembly is cylindrical, the protrusion extends along the radial direction of the electrode assembly, and the first side wall and the second side wall are arranged opposite to each other along the circumference of the electrode assembly.

[0022] In the above technical solution, the protrusion extends along the circumference of the electrode assembly, effectively utilizing the space between the electrode assembly and the first wall, resulting in a larger contact area between the protrusion and the first wall, which is beneficial for improving the current carrying capacity of the battery cell. Furthermore, by arranging the first and second side walls to be spaced relative to each other along the circumference of the electrode assembly, the support effect of the side walls on the top wall can be improved, reducing the risk of the top wall end along the circumference of the electrode assembly collapsing toward the current collecting member, thereby reducing the risk of internal short circuits in the battery cell due to failure of the connection between the top wall and the first wall, thereby improving the reliability of the battery.

[0023] According to some embodiments of the present application, along the circumference of the electrode assembly, the protrusion extends from one end to the other end of the current collecting body.

[0024] In the above technical solution, the protrusion extends along the circumference of the electrode assembly and extends from one end to the other end of the current collecting body, so that there is a larger contact area between the protrusion and the first wall, which is beneficial to improving the current carrying capacity of the battery cell.

[0025] According to some embodiments of the present application, a plurality of protrusions are provided, and the plurality of protrusions are spaced apart along the circumference of the electrode assembly.

[0026] In the above technical solution, by providing a plurality of protrusions spaced apart along the circumference of the electrode assembly, on the one hand, the contact area between the first current collecting member and the first wall can be increased, which is beneficial to the improvement of the current carrying capacity of the battery cell; on the other hand, the risk of internal short circuit in the battery cell due to failure of the connection between one of the protrusions and the first wall can be reduced, so that the battery has higher reliability.

[0027] According to some embodiments of the present application, the electrode assembly is cylindrical, and along the radial direction of the electrode assembly, the protrusion extends from one end of the current collecting body to the other end.

[0028] In the above technical solution, the protrusion extends radially along the electrode assembly and extends from one end to the other end of the current collecting body, so that there is a larger contact area between the protrusion and the first wall, which is beneficial to improving the current flow capacity of the battery cell.

[0029] According to some embodiments of the present application, the protrusion is integrally formed with the current collecting body.

[0030] In the above technical solution, the protrusion and the current collecting body are integrally formed, which can ensure a relatively stable connection between the protrusion and the current collecting body, so that the protrusion is stably arranged between the current collecting body and the first wall, reducing the gap inside the battery cell caused by failure of the connection between the protrusion and the first wall, and making the battery have higher reliability.

[0031] According to some embodiments of the present application, the current collecting body has a first surface in contact with the first tab, the protrusion has a second surface in contact with the first wall, and along the thickness direction of the first wall, the first surface and the second surface have a height difference h, satisfying h≤5mm.

[0032] In the above technical solution, by setting the height difference between the first surface and the second surface to be less than or equal to 5 mm, on the one hand, the second surface of the protrusion can be connected to the first wall to achieve stable transmission of current between the first pole ear and the first wall; on the other hand, it can reduce the risk of interference between the protrusion and the first wall, which may cause the first wall or the protrusion to be compressed and damaged, thereby improving the reliability of the battery.

[0033] According to some embodiments of the present application, the battery cell further includes a second current collecting member, and the second electrode tab and the electrode terminal are electrically connected through the second current collecting member.

[0034] In the above technical solution, by providing the second current collecting member, the difficulty of electrically connecting the second electrode tab to the electrode terminal can be reduced, which is beneficial to the input and output of current.

[0035] According to some embodiments of the present application, the battery cell further includes an insulating member located between the electrode assembly and the first wall, the insulating member being used to separate the first current collecting member from the second current collecting member. Along the thickness direction of the first wall, the orthographic projection of the protrusion and the orthographic projection of the insulating member do not overlap.

[0036] In the above technical solution, the provision of an insulating member effectively reduces the risk of internal short circuits in the battery cells caused by overlapping of the first and second current collecting members, thereby enhancing battery reliability. Furthermore, by ensuring that the orthographic projection of the protrusions along the thickness direction of the first wall does not overlap with the orthographic projection of the insulating member, the insulating member does not interfere with the protrusions along the thickness direction of the first wall. This reduces the difficulty of assembling the insulating member and the first current collecting member, improving battery cell manufacturing efficiency. Furthermore, compared to solutions in which the protrusions are supported by the insulating member so that they protrude from the current collecting member, the insulating member design is simplified and its material cost is reduced, thus facilitating battery cost control.

[0037] According to some embodiments of the present application, a marking portion is provided on a surface of the first wall away from the electrode assembly along a thickness direction of the first wall, and the marking portion is provided corresponding to the convex portion.

[0038] In the above technical solution, by providing a marking portion on the outer surface of the first wall, it is possible to facilitate positioning of the convex portion in the outer shell, reduce the difficulty of welding the first wall and the convex portion, improve the welding accuracy of the first wall and the convex portion, and reduce the risk of poor welding between the first wall and the convex portion, thereby making the battery have higher reliability.

[0039] According to some embodiments of the present application, the marking portion includes a groove formed on the surface of the first wall away from the electrode assembly; or, the marking portion includes an area surrounded by notches formed on the surface of the first wall away from the electrode assembly.

[0040] In the above technical solution, by providing a groove corresponding to the first current collecting component or a notch corresponding to the current collecting component on the outer surface of the first wall, it is possible to facilitate positioning of the convex portion in the outer shell, reduce the difficulty of welding the first wall and the convex portion, improve the welding accuracy of the first wall and the convex portion, reduce the risk of poor welding between the first wall and the convex portion, and thus make the battery have higher reliability.

[0041] In a second aspect, some embodiments of the present application further provide a battery, comprising the battery cell provided in the first aspect.

[0042] In a third aspect, some embodiments of the present application further provide an electrical device, which includes a battery cell as provided in the first aspect, and the battery cell is used to provide electrical energy.

[0043] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] 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.

[0045] FIG1 is a schematic structural diagram of a vehicle in some embodiments of the present application;

[0046] FIG2 is an exploded perspective view of a battery provided in some embodiments of the present application;

[0047] FIG3 is a perspective view of a battery cell in some embodiments of the present application;

[0048] FIG4 is a schematic diagram of the internal structure of a battery cell in some embodiments of the present application;

[0049] FIG5 is an exploded perspective view of a battery cell in some embodiments of the present application;

[0050] FIG6 is a perspective view of a first current collecting component in some embodiments of the present application;

[0051] FIG7 is a schematic diagram of the interior of a first current collecting component in some embodiments of the present application;

[0052] FIG8 is a schematic diagram of the interior of a first current collecting component in some other embodiments of the present application;

[0053] FIG9 is a perspective view of a first current collecting component in some other embodiments of the present application;

[0054] FIG10 is a schematic diagram of a first current collecting component in some embodiments of the present application;

[0055] FIG11 is a schematic diagram of a first current collecting component in some other embodiments of the present application;

[0056] FIG12 is a schematic diagram of a first current collecting component in some other embodiments of the present application;

[0057] FIG13 is a schematic diagram of a first current collecting component in some other embodiments of the present application.

[0058] Icons: 100-battery; 10-battery cell; 11-housing; 110-first wall; 111-housing; 112-bottom plate; 12-electrode terminal; 13-electrode assembly; 130-main body; 131-first tab; 132-second tab; 14-first current collecting member; 140-current collecting body; 1400-first surface; 141-convex portion; 1410-top wall; 1411-side wall; 1412- First side wall; 1413-second side wall; 1414-third side wall; 1415-second surface; 15-second current collecting member; 16-insulating member; 160-insulating member body; 161-partitioning bar; 17-marking portion; x-thickness direction of the first wall; y-circumferential direction of the electrode assembly; 1000-vehicle; 200-controller; 300-motor; 20-casing; 21-first casing body; 22-second casing body. DETAILED DESCRIPTION

[0059] 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.

[0060] 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.

[0061] 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.

[0062] 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.

[0063] 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.

[0064] 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.

[0065] The term "plurality" used in this application refers to two or more (including two).

[0066] 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.

[0067] 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.

[0068] 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.

[0069] 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.

[0070] 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.

[0071] 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.).

[0072] As an example, the positive electrode active material may include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides and their respective modified compounds. However, the present application is not limited to these materials, and other traditional materials that can be used as positive electrode active materials for batteries may also be used. These positive electrode active materials may be used alone or in combination of two or more. Among them, examples of lithium-containing phosphates may include but are not limited to at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO4), a composite material of lithium manganese phosphate and carbon, lithium iron manganese phosphate, and a composite material of lithium iron manganese phosphate and carbon. Examples of lithium transition metal oxides may include but are not limited to lithium cobalt oxide (such as LiCoO2), lithium nickel oxide (such as LiNiO2), lithium manganese oxide (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide (such as LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 O2 (also referred to as NCM 333 ), LiNi 0.5 Co 0.2 Mn 0.3 O2 (also referred to as NCM 523 ), LiNi 0.5 Co 0.25 Mn 0.25 O2 (also referred to as NCM2), 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 NCM8), 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.

[0073] 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.

[0074] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0075] 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.).

[0076] 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.

[0077] 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.

[0078] 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.

[0079] 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.

[0080] In some embodiments, the electrode assembly further includes a separator disposed between the positive electrode and the negative electrode.

[0081] 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.

[0082] 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.

[0083] 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.

[0084] 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.

[0085] 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.

[0086] 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.

[0087] Among them, the gel electrolyte includes a skeleton network with a polymer as the electrolyte, combined with an ionic liquid-lithium salt.

[0088] Among them, solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0089] 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.

[0090] 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.

[0091] As an example, a composite solid electrolyte is formed by adding an inorganic solid electrolyte filler to a polymer solid electrolyte.

[0092] In some embodiments, the electrode assembly is a wound structure, wherein the positive electrode sheet and the negative electrode sheet are wound into the wound structure.

[0093] In some embodiments, the electrode assembly is provided with tabs that can conduct current from the electrode assembly. The tabs include a positive tab and a negative tab.

[0094] 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), nickel steel, stainless steel, a composite metal housing (e.g., a copper-aluminum composite housing), or an aluminum-plastic film.

[0095] As an example, the battery cells may be cylindrical battery cells or prismatic battery cells.

[0096] 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.

[0097] 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.

[0098] 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.

[0099] 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.

[0100] In some embodiments, the battery may be an energy storage device, including an energy storage container, an energy storage cabinet, and the like.

[0101] Batteries have outstanding advantages such as high energy density, low environmental pollution, high power density, long service life, wide adaptability and low self-discharge coefficient. They are an important part of the development of new energy today.

[0102] A battery cell typically includes a housing and an electrode assembly housed within the housing. The electrode assembly includes a main body and tabs disposed on the main body. The tabs are used to output or input electrical energy from the electrode assembly. In order to save space occupied by the electrode assembly within the housing and to increase the energy density of the battery cell, particularly in cylindrical battery cells, in related art, the positive and negative tabs of the electrode assembly are typically disposed at the same end of the main body to achieve a structure in which the electrode assembly has tabs on the same side, thereby saving space occupied by the electrode assembly within the housing. The positive and negative tabs include a first tab and a second tab. The first tab is electrically connected to the first wall, and the second tab is electrically connected to the electrode terminal disposed on the first wall of the housing.

[0103] Improving battery reliability is a pressing technical challenge in the development of battery technology. Currently, in battery cells where the positive and negative tabs are located at the same end of the main body, the portion of the electrode terminal within the outer casing protrudes from the first wall toward the electrode assembly to enable electrical connection with the second tab. However, because the electrode terminal occupies space within the outer casing, there is a distance between the first wall and the first tab. This creates the risk of a connection failure between the first wall and the first tab, leading to a short circuit within the battery cell and thus compromising battery reliability.

[0104] In view of this, to improve the problem of failure of the electrical connection between the first tab and the first wall, which affects battery reliability, some embodiments of the present application provide a battery cell with an electrode assembly having tabs on the same side. The battery cell includes a housing, electrode terminals, an electrode assembly, and a first current collecting member. The first tab is connected to the first wall via the first current collecting member. The first current collecting member includes a current collecting body and a protrusion. The current collecting body is connected to the first tab. The protrusion protrudes from the side of the current collecting body facing away from the first tab and is connected to the first wall.

[0105] In a battery cell of this structure, by arranging a first current collecting member between the first pole lug and the first wall, and providing a protrusion on the current collecting body of the first current collecting member, on the one hand, it is convenient for the first current collecting member to connect the first wall and the first pole lug, thereby reducing the risk of internal short circuit of the battery cell caused by failure of the electrical connection between the first wall and the first pole lug; on the other hand, compared with the solution of making the current collecting body thicker as a whole, it can effectively reduce the material cost of the first current collecting member and reduce the weight of the first current collecting member, which is conducive to improving the weight energy density of the battery, thereby making the battery have higher reliability.

[0106] The electrode assembly disclosed in the embodiments of this application can be used, but is not limited to, in electrical devices such as vehicles, ships, or aircraft. A power supply system comprising the battery cells and batteries disclosed in this application can be used to construct such electrical devices. This helps alleviate the problem of internal short circuits in the battery cells caused by overlap between the tabs and the housing, which can lead to low battery reliability.

[0107] 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.

[0108] 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.

[0109] Please refer to Figure 1, which is a schematic structural diagram of a vehicle 1000 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 provided 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 can 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.

[0110] 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.

[0111] Please refer to FIG. 2 , which is a three-dimensional exploded view of a battery 100 provided in some embodiments of the present application. The battery 100 includes a box body 20 and a battery cell 10 . The battery cell 10 is used to be accommodated in the box body 20 .

[0112] The housing 20 is used to provide assembly space for the battery cells 10 and can adopt a variety of structures. In some embodiments, the housing 20 can include a first housing body 21 and a second housing body 22. The first housing body 21 and the second housing body 22 cover each other, and the first housing body 21 and the second housing body 22 jointly define an assembly space for accommodating the battery cells 10. The second housing body 22 can be a hollow structure with one end open. The first housing body 21 can be a plate-like structure, and the first housing body 21 covers the open side of the second housing body 22, so that the first housing body 21 and the second housing body 22 jointly define the assembly space. The first housing body 21 and the second housing body 22 can also be hollow structures with one end open, and the open side of the first housing body 21 covers the open side of the second housing body 22.

[0113] Of course, the box body 20 formed by the first box body 21 and the second box body 22 can be in various shapes, such as a cylinder, a cuboid or a cube, etc. For example, in FIG2 , the box body 20 is in the shape of a cuboid.

[0114] In the battery 100, there can be one or more battery cells 10 disposed within the housing 20. When there are multiple battery cells 10 disposed within the housing 20, the multiple battery cells 10 can be connected in series, in parallel, or in a hybrid configuration. A hybrid configuration refers to multiple battery cells 10 being connected both in series and in parallel. Multiple battery cells 10 can be directly connected in series, in parallel, or in a hybrid configuration, and then the entire structure formed by the multiple battery cells 10 is housed within the housing 20. Alternatively, the battery 100 can be constructed by first connecting multiple battery cells 10 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 20.

[0115] 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 10 to achieve electrical connection between the multiple battery cells 10 .

[0116] Each battery cell 10 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 10 can be cylindrical, prismatic, or in other shapes. For example, in FIG3 , the battery cell 10 is cylindrical.

[0117] According to some embodiments of the present application, a battery cell 10 is provided, please refer to Figures 3 to 7. Figure 3 is a stereoscopic diagram of the battery cell 10 in some embodiments of the present application, Figure 4 is an internal schematic diagram of the local structure of the battery cell 10 in some embodiments of the present application, Figure 5 is a stereoscopic exploded diagram of the battery cell 10 in some embodiments of the present application, Figure 6 is a stereoscopic diagram of the first current collecting component 14 in some embodiments of the present application, and Figure 7 is an internal schematic diagram of the first current collecting component 14 in some embodiments of the present application.

[0118] The battery cell 10 includes a housing 11, electrode terminals 12, an electrode assembly 13, and a first current collecting member 14. The housing 11 has a first wall 110. The electrode terminal 12 is insulated and mounted to the first wall 110. The electrode assembly 13 is housed within the housing 11 and includes a main body 130, a first electrode tab 131, and a second electrode tab 132. The first electrode tab 131 and the second electrode tab 132 have opposite polarities. Along the thickness direction x of the first wall 110, the first electrode tab 131 and the second electrode tab 132 are both located at the end of the main body 130 facing the first wall 110. The second electrode tab 132 is electrically connected to the electrode terminal 12. The first current collecting member 14 includes a current collecting body 140 and a protrusion 141. The current collecting body 140 is connected to the first electrode tab 131. The protrusion 141 protrudes from the side of the current collecting body 140 facing away from the first electrode tab 131 and is connected to the first wall 110.

[0119] The housing 11 is a component for accommodating the electrode assembly 13. The housing 11 can also be used to accommodate an electrolyte, such as an electrolyte. Referring to Figure 5, in some embodiments, the housing 11 includes a shell 111 and an end cap. A accommodating cavity is formed inside the shell 111, and the accommodating cavity is used to accommodate the electrode assembly 13. The shell 111 has an opening connected to the accommodating cavity. The end cap is covered at the opening of the shell 111 and forms a sealed connection to form a sealed space for accommodating the electrode assembly 13 and the electrolyte. Optionally, the housing 11 may also include a bottom plate 112, and openings are respectively formed at both ends of the shell 111, one of the openings is closed by the end cap, and the other opening is closed by the bottom plate 112.

[0120] In some embodiments, the material of the shell 11 can be metal or a combination of metal and non-metal. For example, the shell 11 can be made of metal, such as aluminum, copper, iron, aluminum, steel or aluminum alloy; for example, part of the shell 11 can be made of metal, and the rest can be made of non-metal, such as the end cover of the shell 11 can be made of metal, and the shell 111 or other parts of the shell 11 can be made of non-metallic materials.

[0121] In some embodiments, when assembling the battery cell 10, the electrode assembly 13 may be placed in the housing 111 first, and the housing 111 may be filled with electrolyte, and then the end cap may be attached to the opening of the housing 111 to complete the assembly of the battery cell 10. Alternatively, in some embodiments, when assembling the battery cell 10, the electrode assembly 13 may be placed in the housing 111 first, and then the end cap may be attached to the opening of the housing 111, and then the housing 111 may be filled with electrolyte through the injection hole on the end cap or other part of the housing 11, and then the injection hole may be closed to complete the assembly of the battery cell 10.

[0122] The housing 11 may be in various shapes, such as a cylindrical or prismatic structure. The shape of the housing 11 may be determined according to the specific shape of the electrode assembly 13. For example, if the electrode assembly 13 is a cylindrical structure, a cylindrical housing 11 may be selected.

[0123] The first wall 110 is a partial structure of the outer shell 11. The first wall 110 can be insulated and equipped with an electrode terminal 12. The electrode terminal 12 is used to connect to the second electrode tab 132 of the electrode assembly 13. The first wall 110 can be electrically connected to the first electrode tab 131. The first wall 110 can be made of a conductive material, such as a metal material. For example, the first wall 110 is made of aluminum, copper, iron, aluminum, steel or aluminum alloy. The first wall 110 can be electrically connected to the first electrode tab 131 of the electrode assembly 13. In some embodiments, the first wall 110 can be an end cover of the outer shell 11. The shell 111 of the outer shell 11 is arranged around the edge of the first wall 110.

[0124] In some embodiments, the first wall 110 can be connected to the shell 111 of the housing 11 by welding, bonding, clamping or other connection methods. In some embodiments, the first wall 110 and the shell 111 can be integrally formed.

[0125] The electrode terminal 12 is an insulated component mounted on the first wall 110. The electrode terminal 12 is used to connect to the second tab 132 of the electrode assembly 13, allowing current to flow into or out of the second tab 132 through the electrode terminal 12. In some embodiments, the electrode terminal 12 can have a cylindrical structure or a polygonal prism structure. In some embodiments, the electrode terminal 12 is made of a metal material, such as aluminum, copper, iron, aluminum, steel, an alloy, or a composite metal.

[0126] In some embodiments, the electrode terminal 12 may be mounted on the first wall 110 via an insulating structure.

[0127] It should be noted that the electrode assembly 13 is the component within the battery cell 10 where the electrochemical reaction occurs. The electrode assembly 13 can have various structures. For example, the electrode assembly 13 can be a wound structure formed by winding a positive electrode sheet, a separator, and a negative electrode sheet, with the main body 130 of the electrode assembly 13 being cylindrical. For example, the separator is a separator, the primary material of which can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, and polyvinylidene fluoride.

[0128] Among them, the main body 130 is the area where the electrode assembly 13 undergoes chemical reactions within the battery cell 10. The main body 130 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.

[0129] In some embodiments, the thickness direction x of the first wall 110 may be parallel to the height direction of the electrode assembly 13 .

[0130] The first electrode tab 131 and the second electrode tab 132 are both disposed at one end of the main body 130 facing the first wall 110. In other words, the first electrode tab 131 and the second electrode tab 132 are disposed at the same end of the main body 130 in the thickness direction x of the first wall, and are located at the end of the main body 130 facing the first wall 110. The first electrode tab 131 and the second electrode tab 132 are respectively used to output or input the positive and negative electrodes of the electrode assembly 13. If the first electrode tab 131 is used to input or output the positive electrode of the electrode assembly 13, the first electrode tab 131 is a component formed by stacking and connecting the regions of the positive electrode sheet that are not coated with the positive electrode active material layer. Correspondingly, the second electrode tab 132 is used to input or output the negative electrode of the electrode assembly 13, and the second electrode tab 132 is a component formed by stacking and connecting the regions of the negative electrode sheet that are not coated with the negative electrode active material layer. If the first electrode tab 131 is used to input or output the negative electrode of the electrode assembly 13, the first electrode tab 131 is a component formed by stacking and connecting the regions of the negative electrode sheet that are not coated with the negative electrode active material layer. Correspondingly, the second electrode tab 132 is used to input or output the positive electrode of the electrode assembly 13, and the second electrode tab 132 is a component formed by stacking and connecting the regions of the positive electrode sheet that are not coated with the positive electrode active material layer. For example, in the embodiment of the present application, the first electrode tab 131 is used to input or output the negative electrode of the electrode assembly 13, and the second electrode tab 132 is used to input or output the positive electrode of the electrode assembly 13.

[0131] “The second electrode tab 132 is electrically connected to the electrode terminal 12” can be understood as the second electrode tab 132 being directly or indirectly connected to the electrode terminal 12 to achieve electrical connection between the second electrode tab 132 and the electrode terminal 12. For example, in some embodiments, the second electrode tab 132 is directly connected to the electrode terminal 12; in some embodiments, the second electrode tab 132 is connected to the electrode terminal 12 through the second current collecting member 15, wherein the second electrode tab 132 and the electrode terminal 12 can be respectively welded to the second current collecting member 15.

[0132] The first current collecting member 14 is disposed between the first electrode tab 131 and the first wall 110, and can achieve electrical connection between the first electrode tab 131 and the first wall 110 through the first current collecting member 14. The first current collecting member 14 is made of a conductive material, for example, aluminum, copper, iron, aluminum, steel, stainless steel, nickel steel, or an aluminum alloy.

[0133] The current collecting body 140 is a component of the first current collecting member 14 that is used to connect to the first electrode tab 131. In some embodiments, the current collecting body 140 may be in the form of a sheet, a block, or other shapes. The surface of the current collecting body 140 facing the first electrode tab 131 may be connected to the first electrode tab 131. The material of the current collecting body 140 may be the same as that of the first electrode tab 131. The material of the first current collecting member 14 may be the same as that of the first wall 110. The connection between the current collecting body 140 and the first electrode tab 131 includes, but is not limited to, welding, bonding, clamping, or connection via other connecting members.

[0134] The protrusion 141 is a component that protrudes from the current collector body 140. The protrusion 141 extends parallel to the first electrode tab 131 and points toward the first wall 110. The protrusion 141 is used to connect to the first wall 110. The connection between the protrusion 141 and the current collector body 140 establishes an electrical connection between the first wall 110 and the first electrode tab 131. The protrusion 141 can be in the shape of a block, a round convex shape, a strip, a curve, or other shapes. The protrusion 141 can be hollow or solid.

[0135] In the thickness direction x of the first wall, a surface of the current collecting body 140 facing the first electrode tab 131 may be connected to the first electrode tab 131 , and a surface of the current collecting body 140 away from the first electrode tab 131 may be connected to the protrusion 141 .

[0136] The material of the protrusion 141 can be the same as that of the first wall 110. The material of the protrusion 141 can also be the same as that of the first tab 131. The connection between the protrusion 141 and the first wall 110 includes, but is not limited to, welding, bonding, clamping, or connection via other connecting members.

[0137] The material of the protrusion 141 can be the same as or different from that of the current collecting body 140. The protrusion 141 and the current collecting body 140 can be separate structures. For example, the protrusion 141 is connected to the current collecting body 140 by welding, bonding, clamping, or other connection methods such as connection via other connecting members. The protrusion 141 and the current collecting body 140 can also be an integral structure. For example, the protrusion 141 is stamped from the current collecting body 140 using a stamping process, or the protrusion 141 and the current collecting body 140 are integrally cast.

[0138] In the above technical solution, by arranging both the first tab 131 and the second tab 132 of the electrode assembly 13 on the same end surface of the main body 130, the space occupied by the electrode assembly 13 in the direction from the electrode assembly 13 to the first wall 110 is reduced, thereby improving the energy density of the battery cell 10 having such an electrode assembly 13. Furthermore, by providing a protrusion 141 on the current collecting body 140 and connecting the protrusion 141 to the first wall 110, this not only facilitates the connection between the first current collecting member 14 and the first tab 131, but also reduces the risk of internal short circuits in the battery cell 10 due to a failure in the connection between the first wall 110 and the first current collecting member 14. Furthermore, compared to solutions in which the current collecting body 140 is made thicker as a whole, the material cost and weight of the first current collecting member 14 are effectively reduced, thereby improving the weight energy density of the battery 100 and thereby enhancing the reliability of the battery 100.

[0139] According to some embodiments of the present application, referring to FIG. 7 , the protrusion 141 includes a top wall 1410 and a side wall 1411 . The top wall 1410 is connected to the first wall 110 . The side wall 1411 connects the top wall 1410 and the current collecting body 140 . The top wall 1410 and the side wall 1411 form a cavity.

[0140] The protrusion 141 may include a wall portion, which may include a top wall 1410 and a side wall 1411 . The top wall 1410 is the portion of the protrusion 141 farthest from the current collecting body 140 in the thickness direction x of the first wall 110 , and the side wall 1411 is a component connecting the current collecting body 140 and the top wall 1410 .

[0141] In some embodiments, the top wall 1410 may be a flat plate-shaped structure, and a surface of the top wall 1410 away from the current collecting body 140 may be connected to the first wall 110 .

[0142] The sidewall 1411 may be a plate-like structure or a curved structure with a flat surface. The number of sidewalls 1411 may be one or more. For example, the number of sidewalls 1411 is one, one end of the sidewall 1411 is connected to the top wall 1410, and the other end is connected to the current collecting body 140. For another example, the number of sidewalls 1411 is one, and the sidewall 1411 extends along the circumference of the top wall 1410 and surrounds the top wall 1410 or surrounds the edge of the top wall 1410. The number of sidewalls 1411 may be multiple, such as two, three or four, and the multiple sidewalls 1411 are spaced apart along the circumference of the top wall 1410. For example, the number of sidewalls 1411 is two, and the two sidewalls 1411 are spaced apart along the thickness direction of the sidewall 1411 or along the width direction of the top wall 1410. In the thickness direction x of the first wall 110, one end of the side wall 1411 can be connected to the edge of the top wall 1410 or to a non-edge portion of the top wall 1410, and the other end of the side wall 1411 can be connected to the current collecting body 140. Referring to Figures 6 and 7, the top wall 1410 can be a plate-like structure with a flat surface that extends in an arc-shaped trajectory. There are two side walls 1411, which are spaced apart along the width direction of the top wall 1410 and are respectively connected to the edge of the top wall 1410.

[0143] The phrase "a cavity enclosed by the top wall 1410 and the side walls 1411" can be understood as meaning that there is a hollow space between the top wall 1410 and the side walls 1411. This cavity can accommodate air, or may be hollow, or may contain other structures of the battery cell 10. For example, the first tab 131 of the battery cell 10 can utilize this cavity to increase the volume of the electrode assembly 13, thereby improving the energy density of the battery cell 10. For another example, the absence of other components in this cavity can reduce the weight of the first current collecting member 14 compared to a solid protrusion.

[0144] In some embodiments, a through hole may be formed in a portion of the current collecting body 140 corresponding to the top wall 1410. For example, the protrusion 141 is formed by stamping the current collecting body 140 using a stamping process, wherein the current collecting body 140 may be a plate-shaped structure, and the stamping head stamps from one side of the current collecting body 140 to the other side to form a groove on one side of the current collecting body 140 and a protruding protrusion on the other side.

[0145] In some embodiments, the wall portion of the protrusion 141 may further include a bottom wall, for example, a side wall 1411 connecting the bottom wall and the top wall 1410 , and the bottom wall is connected to the current collecting body 140 .

[0146] In the above technical solution, the top wall 1410 is connected to the current collecting body 140 via the side wall 1411, allowing the top wall 1410 to protrude from the current collecting body 140 and connect to the first wall 110, thereby achieving electrical connection between the first electrode tab 131 and the first wall 110. The cavity enclosed by the top wall 1410 and the side wall 1411 can be understood as a cavity between the top wall 1410 and the side wall 1411. Therefore, compared to a solid structure of the protrusion 141, this can effectively reduce the weight of the protrusion 141 and improve the weight energy density of the battery 100. Furthermore, the thickness of the top wall 1410 can be relatively thin, facilitating welding between the first wall 110 and the top wall 1410, thereby improving the manufacturing efficiency of the battery 100.

[0147] In some other embodiments, the protrusion 141 may also be a solid structure, for example, FIG8 is a schematic diagram of the interior of the first current collecting member 14 in some other embodiments of the present application. The protrusion 141 is a solid block-shaped structure. In the thickness direction x of the first wall 110, the surface of the protrusion 141 away from the current collecting body 140 may be connected to the first wall 110, and the surface of the protrusion 141 away from the first wall 110 may be connected to the current collecting body 140.

[0148] According to other embodiments of the present application, please refer to FIG. 9 , which is a three-dimensional view of the first current collecting component 14 in other embodiments of the present application, in which the side walls 1411 are arranged around the top wall 1410 .

[0149] In some embodiments, there may be one side wall 1411 , which may be disposed around the top wall 1410 to provide support for the top wall 1410 in the circumferential direction thereof, so that the top wall 1410 protrudes from the current collecting body 140 to be stably connected to the first wall 110 .

[0150] In some embodiments, a side wall 1411 may surround the top wall 1410 , for example, a side wall 1411 may be disposed along an edge of the top wall 1410 .

[0151] In Figure 9, the top wall 1410 may be circular, and the side wall 1411 may be annular. One end of the annular side wall 1411 is connected to the edge of the top wall 1410, and the other end of the annular side wall 1411 is connected to the current collecting body 140. The outer contour of the protrusion is a cylindrical structure.

[0152] In the above technical solution, by setting the side wall 1411 to surround the top wall 1410, the supporting effect of the side wall 1411 on the top wall 1410 can be improved, and the risk of the top wall 1410 collapsing toward the current collecting body 140 can be reduced, which is conducive to the effective connection of the top wall 1410 with the first wall 110, thereby reducing the risk of internal short circuit of the battery cell 10 due to failure of the connection between the top wall 1410 and the first wall 110, thereby making the battery 100 have higher reliability.

[0153] According to some embodiments of the present application, referring to FIG. 6 and FIG. 7 , the side wall 1411 includes a first side wall 1412 and a second side wall 1413 oppositely arranged, the first side wall 1412 connects the top wall 1410 and the current collecting body 140 , and the second side wall 1413 connects the top wall 1410 and the current collecting body 140 .

[0154] There may be multiple side walls 1411, for example, side walls 1411 include a first side wall 1412 and a second side wall 1413. The first side wall 1412 and the second side wall 1413 may be two independent wall portions, which can jointly support the top wall 1410 and can also separately provide support for the top wall 1410. For example, in some embodiments, when the first side wall 1412 breaks, the second side wall 1413 can still support the top wall 1410.

[0155] The first side wall 1412 and the second side wall 1413 are arranged opposite to each other, which can be understood as the first side wall 1412 and the second side wall 1413 are spaced apart in one direction to improve the supporting effect of the side wall 1411 on the top wall 1410 in the one direction. The one direction mentioned above does not specify a specific direction.

[0156] 6 and 7 , the first sidewall 1412 and the second sidewall 1413 may be spaced apart in the width direction of the top wall 1410. Alternatively, the first sidewall 1412 and the second sidewall 1413 may be spaced apart in the thickness direction of the first sidewall 1412 or the thickness direction of the second sidewall 1413. In another example, the first sidewall 1412 and the second sidewall 1413 may be spaced apart in the length direction of the top wall 1410. For example, when the electrode assembly 13 is a cylindrical structure, the first sidewall 1412 and the second sidewall 1413 may be spaced apart in the circumferential direction or radial direction of the motor assembly.

[0157] Please refer to Figure 7. The first side wall 1412 and the second side wall 1413 are arranged at relative intervals. The current collecting body 140, the first side wall 1412, the top wall 1410 and the second side wall 1413 are interconnected to form a "J"-shaped geometric structure. In the direction of the relative interval between the first side wall 1412 and the second side wall 1413, the opposite ends of the top wall 1410 are supported, so the structure of the top wall 1410 is relatively stable, and the risk of the top wall 1410 collapsing toward the current collecting body 140 is relatively small.

[0158] Please refer to Figure 6. The side wall 1411 may include a first side wall 1412 and a second side wall 1413. The first side wall 1412 and the second side wall 1413 are spaced apart along the width direction of the top wall 1410. The side walls 1411 are not provided at both ends of the length direction of the top wall 1410, that is, the two ends of the length direction of the top wall 1410 are open.

[0159] In the above technical solution, the top wall 1410 is jointly supported by the relatively arranged first side wall 1412 and the second side wall 1413, which can improve the supporting effect of the side wall 1411 on the top wall 1410, reduce the risk of the top wall 1410 collapsing toward the collecting body 140, and facilitate the effective connection of the top wall 1410 with the first wall 110, thereby reducing the risk of internal short circuit of the battery cell 10 due to failure of the connection between the top wall 1410 and the first wall 110, thereby making the battery 100 have higher reliability.

[0160] According to other embodiments of the present application, please refer to FIG10 , which is a schematic diagram of the first current collecting component 14 in some embodiments of the present application.

[0161] The sidewall 1411 further includes a third sidewall 1414 . The third sidewall 1414 connects the top wall 1410 and the current collecting body 140 . The third sidewall 1414 connects the first sidewall 1412 and the second sidewall 1413 .

[0162] There may be multiple side walls 1411, for example, the side walls 1411 include a first side wall 1412, a second side wall 1413, and a third side wall 1414. For example, in some embodiments, when the first side wall 1412 is broken, the second side wall 1413 and the third side wall 1414 can still support the top wall 1410; or when the first side wall 1412 and the second side wall 1413 are broken, the third side wall 1414 can still support the top wall 1410.

[0163] In some embodiments, the first side wall 1412, the second side wall 1413, and the third side wall 1414 may be three independent wall portions, which can jointly support the top wall 1410 and can also separately provide support for the top wall 1410. In some embodiments, the first side wall 1412, the second side wall 1413, and the third side wall 1414 may be an integral structure.

[0164] In some embodiments, in the thickness direction x of the first wall 110, one end of the third sidewall 1414 is connected to the top wall 1410, and the other end of the third sidewall 1414 is connected to the current collecting body 140. In a direction perpendicular to the thickness direction x of the first wall 110, one end of the third sidewall 1414 can be connected to the first sidewall 1412, and the other end of the third sidewall 1414 can be connected to the second sidewall 1413.

[0165] In some embodiments, the third sidewall 1414 may be connected to an edge of the top wall 1410, or to the edges of the first sidewall 1412 and the second sidewall 1413. In other embodiments, the third sidewall 1414 may be connected to a non-edge portion of the top wall 1410, or to the non-edge portions of the first sidewall 1412 and the second sidewall 1413.

[0166] The number of third sidewalls 1414 may be one, two, or more. For example, in FIG10 , the number of third sidewalls 1414 may be two. In other embodiments, multiple third sidewalls 1414 may be disposed between the first sidewall 1412 and the second sidewall 1413, and the multiple third sidewalls 1414 may be spaced apart along the extension direction of the first sidewall 1412 or the extension direction of the second sidewall 1413.

[0167] For example, please compare Figures 6 and 10. In Figures 6 and 10, sidewall 1411 may include a first sidewall 1412 and a second sidewall 1413, which are spaced apart along the width direction of top wall 1410. In Figure 6, sidewalls 1411 are not provided at both ends of the top wall 1410 in the longitudinal direction, meaning that both ends of the top wall 1410 in the longitudinal direction are open, i.e., openings are formed. In Figure 10, third sidewalls 1414 are provided at both ends of the top wall 1410 in the longitudinal direction. Compared to Figure 6, third sidewalls 1414 can close the openings at the ends of the top wall 1410 in the longitudinal direction.

[0168] In the above technical solution, by setting the third side wall 1414 to connect the top wall 1410 and the current collecting body 140, the supporting effect of the side wall 1411 on the top wall 1410 can be improved, and the risk of the top wall 1410 collapsing toward the current collecting body 140 is reduced, which is conducive to the effective connection of the top wall 1410 with the first wall 110; at the same time, the third side wall 1414 connects the first side wall 1412 and the second side wall 1413, which can further improve the supporting effect of the side wall 1411 on the top wall 1410, thereby reducing the risk of internal short circuit of the battery cell 10 due to failure of the connection between the top wall 1410 and the first wall 110, thereby making the battery 100 have higher reliability.

[0169] According to some embodiments of the present application, referring to FIG. 5 and FIG. 6 , the electrode assembly 13 is cylindrical, the protrusion 141 extends along the circumferential direction y of the electrode assembly, and the first side wall 1412 and the second side wall 1413 are arranged opposite to each other along the radial direction of the electrode assembly 13 .

[0170] The battery cell 10 may be a cylindrical structure, and correspondingly, the electrode assembly 13 may also be a cylindrical structure. The first wall 110 of the housing 11 may be disc-shaped, and the circumferential direction of the first wall 110 may be the circumferential direction y of the electrode assembly.

[0171] "Protrusion 141 extends along the circumferential direction y of the electrode assembly" may mean that the length of protrusion 141 corresponds to the circumferential direction y of the electrode assembly, that is, the length of protrusion 141 corresponds to the circumferential direction y of the first wall 110. For example, as shown in Figure 6 , the extension path of protrusion 141 is parallel to the circumferential direction y of the electrode assembly. For another example, Figure 11 , which is a schematic diagram of the first current collecting member 14 in other embodiments of the present application, shows that the extension path of protrusion 141 is serpentine. Protrusion 141 rationally utilizes the space around the circumference of electrode assembly 13, providing a larger area for connection with first wall 110.

[0172] The first side wall 1412 and the second side wall 1413 are arranged opposite to each other along the radial direction of the electrode assembly 13. It can be understood that the relative arrangement direction of the first side wall 1412 and the second side wall 1413 is perpendicular to the extension direction of the protrusion 141, for example, the first side wall 1412 and the second side wall 1413 are spaced apart in the width direction of the protrusion 141; it can also be understood that the extension direction of the first side wall 1412 and the second side wall 1413 can be parallel to the extension direction of the protrusion 141, so as to effectively support the top wall 1410.

[0173] In the above technical solution, the protrusion 141 extends along the circumferential direction y of the electrode assembly, effectively utilizing the space between the electrode assembly 13 and the first wall 110. This allows for a larger contact area between the protrusion 141 and the first wall 110, thereby improving the current carrying capacity of the battery cell 10. Furthermore, by disposing the first side wall 1412 and the second side wall 1413 with relative spacing along the radial direction of the electrode assembly 13, the support provided by the side wall 1411 to the top wall 1410 can be enhanced, reducing the risk of the radial end of the top wall 1410 collapsing toward the current collecting member along the electrode assembly 13. This, in turn, reduces the risk of internal short circuits in the battery cell 10 due to connection failure between the top wall 1410 and the first wall 110, thereby enhancing the reliability of the battery 100.

[0174] In some other embodiments, the protrusion 141 extends along the circumferential direction y of the electrode assembly, and the first side wall 1412 and the second side wall 1413 may be arranged opposite to each other along the circumferential direction y of the electrode assembly.

[0175] According to some embodiments of the present application, referring to FIG12 , FIG12 is a schematic diagram of the first current collecting member 14 in other embodiments of the present application, the electrode assembly 13 is cylindrical, the protrusion 141 extends along the radial direction of the electrode assembly 13, and the first side wall 1412 and the second side wall 1413 are relatively arranged along the circumferential direction y of the electrode assembly.

[0176] The battery cell 10 may be a cylindrical structure, and correspondingly, the electrode assembly 13 may also be a cylindrical structure. The first wall 110 of the housing 11 may be disc-shaped, and the circumferential direction of the first wall 110 may be the circumferential direction y of the electrode assembly.

[0177] “The protrusion 141 extends along the radial direction of the electrode assembly 13 ” may mean that the length direction of the protrusion 141 corresponds to the radial direction of the electrode assembly 13 , that is, the length direction of the protrusion 141 corresponds to the radial direction of the first wall 110 .

[0178] The first side wall 1412 and the second side wall 1413 are disposed opposite each other along the circumferential direction y of the electrode assembly. It can be understood that the direction in which the first side wall 1412 and the second side wall 1413 are disposed opposite each other is perpendicular to the extension direction of the protrusion 141. For example, the first side wall 1412 and the second side wall 1413 are spaced apart in the width direction of the protrusion 141. It can also be understood that the extension direction of the first side wall 1412 and the second side wall 1413 can be parallel to the extension direction of the protrusion 141 to effectively support the top wall 1410.

[0179] In the above technical solution, the protrusion 141 extends along the circumferential direction y of the electrode assembly, effectively utilizing the space between the electrode assembly 13 and the first wall 110. This allows for a larger contact area between the protrusion 141 and the first wall 110, thereby improving the current carrying capacity of the battery cell 10. Furthermore, by disposing the first side wall 1412 and the second side wall 1413 with relative spacing along the circumferential direction y of the electrode assembly, the support provided by the side wall 1411 to the top wall 1410 can be enhanced, reducing the risk of the end of the top wall 1410 along the circumferential direction y of the electrode assembly collapsing toward the current collecting member. This, in turn, reduces the risk of internal short circuits in the battery cell 10 due to connection failure between the top wall 1410 and the first wall 110, thereby enhancing the reliability of the battery 100.

[0180] In some other embodiments, the protrusion 141 extends along the radial direction of the electrode assembly 13 , and the first sidewall 1412 and the second sidewall 1413 may be disposed opposite to each other along the radial direction of the electrode assembly 13 .

[0181] According to some embodiments of the present application, referring to FIG. 6 , along the circumferential direction y of the electrode assembly, the protrusion 141 extends from one end to the other end of the current collecting body 140 .

[0182] "Extending from one end of the current collecting body 140 to the other end" can be understood as referring to the ends of the current collecting body 140 that are spaced apart from each other. Referring to Figures 5 and 6 , the electrode assembly 13 has a cylindrical structure, and the first electrode tab 131 has a fan-shaped structure to effectively utilize the space between the electrode assembly 13 and the first wall 110. Accordingly, the outer contour of the first current collecting member 14 can be configured to correspond to the fan-shaped first electrode tab 131. The one end and the other end of the current collecting body 140 can be understood as the two ends of the fan-shaped first current collecting member 140 that are spaced apart from each other in the circumferential direction y of the electrode assembly, for example, the first end and the second end. The protrusion 141 can extend from the first end along the circumferential direction y of the electrode assembly toward the second end, with the extension terminating at the second end.

[0183] In the above technical solution, the protrusion 141 extends along the circumferential direction y of the electrode assembly and extends from one end to the other end of the current collecting body 140, so that there is a larger contact area between the protrusion 141 and the first wall 110, which is beneficial to improving the current carrying capacity of the battery cell 10.

[0184] In some other embodiments, the electrode assembly 13 is cylindrical, and along the radial direction of the electrode assembly 13 , the protrusion 141 may extend from one end to the other end of the current collecting body 140 .

[0185] According to other embodiments of the present application, please refer to Figure 13, which is a schematic diagram of the first current collecting member 14 in other embodiments of the present application. A plurality of protrusions 141 are provided, and the plurality of protrusions 141 are spaced apart along the circumferential direction y of the electrode assembly.

[0186] In some embodiments, the number of the protrusions 141 can be multiple, such as two, three, or four.

[0187] The battery cell 10 can be cylindrical, and accordingly, the electrode assembly 13 can also be cylindrical. The first wall 110 of the housing 11 can be disc-shaped, with the circumference of the first wall 110 corresponding to the circumferential direction y of the electrode assembly. Multiple protrusions 141 can be spaced apart along the circumferential direction y of the electrode assembly. As shown in FIG13 , two protrusions 141 are spaced apart along the circumferential direction y of the electrode assembly on the current collector body 140.

[0188] In the above technical solution, by providing a plurality of protrusions 141 spaced apart along the circumferential direction y of the electrode assembly, on the one hand, the contact area between the first current collecting member 14 and the first wall 110 can be increased, which is beneficial to the improvement of the current carrying capacity of the battery cell 10; on the other hand, the risk of internal short circuit in the battery cell 10 due to failure of the connection between one of the protrusions 141 and the first wall 110 can be reduced, so that the battery 100 has higher reliability.

[0189] In some other embodiments, the number of the protrusion 141 may be only one. In some other embodiments, the number of the protrusion 141 may be multiple, and the multiple protrusions 141 may be arranged at intervals, for example, the multiple protrusions 141 may be arranged at intervals along the radial direction of the electrode assembly 13.

[0190] According to some embodiments of the present application, the protrusion 141 and the current collecting body 140 are integrally formed.

[0191] The protrusion 141 can be formed on the current collecting body 140 by a stamping process. The protrusion 141 and the current collecting body 140 can also be integrally cast. The protrusion 141 and the current collecting body 140 can also be integrally formed by three-dimensional printing.

[0192] In the above technical solution, the protrusion 141 and the current collecting body 140 are integrally formed, which can ensure a relatively stable connection between the protrusion 141 and the current collecting body 140, so that the protrusion 141 is stably arranged between the current collecting body 140 and the first wall 110, reducing the gap caused by the internal short circuit of the battery cell 10 due to the failure of the connection between the protrusion 141 and the first wall 110, so that the battery 100 has higher reliability.

[0193] According to some embodiments of the present application, referring to FIG. 7 , the current collecting body 140 has a first surface 1400 in contact with the first electrode tab 131 , the protrusion 141 has a second surface 1415 in contact with the first wall 110 , and along the thickness direction x of the first wall 110 , the first surface 1400 and the second surface 1415 have a height difference h, satisfying h≤5 mm.

[0194] Along the thickness direction x of the first wall, the height difference h between the first surface 1400 and the second surface 1415 can be regarded as the overall thickness of the first current collecting member 14 .

[0195] In some embodiments, h may be less than or equal to 5 mm, for example, h may be 5 mm, 4 mm, 3 mm or a smaller value.

[0196] In the above technical solution, by setting the height difference between the first surface 1400 and the second surface 1415 to be less than or equal to 5 mm, on the one hand, the second surface 1415 of the protrusion 141 can be connected to the first wall 110 to achieve stable transmission of current between the first pole ear 131 and the first wall 110; on the other hand, it can reduce the risk of interference between the protrusion 141 and the first wall 110, resulting in the first wall 110 or the protrusion 141 being compressed and damaged, thereby improving the reliability of the battery 100.

[0197] In some other embodiments, the height difference h between the first surface 1400 and the second surface 1415 may also be greater than 5 mm, for example, h may be 6 mm, 7 mm, or a larger value.

[0198] According to some embodiments of the present application, referring to FIG. 5 , the battery cell 10 further includes a second current collecting member 15 , and the second electrode tab 132 and the electrode terminal 12 are electrically connected via the second current collecting member 15 .

[0199] The second current collecting member 15 is disposed between the second electrode tab 132 and the electrode terminal 12. The second current collecting member 15 is made of a conductive material. For example, the material of the second current collecting member 15 can be aluminum, copper, iron, aluminum, steel, stainless steel, nickel steel, or an aluminum alloy. The material of the second current collecting member 15 can be the same as that of the second electrode tab 132. The material of the second adapter can be the same as that of the electrode terminal 12.

[0200] The connection between the second current collecting member 15 and the second electrode tab 132 includes, but is not limited to, welding, bonding, clamping, or connection via other connecting members. The connection between the second current collecting member 15 and the electrode terminal 12 includes, but is not limited to, welding, bonding, clamping, or connection via other connecting members.

[0201] In the above technical solution, by providing the second current collecting member 15 , the difficulty of electrically connecting the second electrode tab 132 to the electrode terminal 12 can be reduced, which is beneficial to the input and output of current.

[0202] According to some embodiments of the present application, referring to Figures 4 and 5 , the battery cell 10 further includes an insulating member 16 located between the electrode assembly 13 and the first wall 110. The insulating member 16 is used to separate the first current collecting member 14 from the second current collecting member 15. Along the thickness direction x of the first wall 110, the orthographic projection of the protrusion 141 and the orthographic projection of the insulating member 16 do not overlap.

[0203] The insulating member 16 is disposed between the electrode assembly 13 and the first wall 110. The insulating member 16 has insulating properties and can insulate and isolate the first current collecting member 14 from the second current collecting member 15. In some embodiments, the insulating member 16 can be in the form of a sheet, plate, or ring. In some embodiments, the insulating member 16 can be made of rubber, silicone, or plastic. In some embodiments, the insulating member 16 is made of an insulating material, such as polypropylene, polyethylene, or other insulating material.

[0204] In some embodiments, the insulating member 16 may be the lower plastic of the battery cell 10. Referring to FIG5 , the insulating member 16 includes an insulating member body 160 and a separator 161. The insulating member body 160 is annular, and the separator 161 is disposed within the insulating member body 160 to divide the interior space of the insulating member body 160 into two subspaces, one of which accommodates the first current collecting member 14 and the other accommodates the second current collecting member 15.

[0205] 4 , in the thickness direction x of the first wall 110 , the orthographic projection of the protrusion 141 and the orthographic projection of the insulating member 16 do not overlap. In some embodiments, the insulating member 16 is not disposed in the cavity enclosed by the sidewalls 1411 and the top wall 1410 .

[0206] In the above-described technical solution, the provision of insulating member 16 effectively reduces the risk of overlapping first and second current collecting members 14, 15, causing internal short circuits in battery cells 10, thereby enhancing the reliability of battery 100. Furthermore, by arranging the orthographic projection of protrusion 141 along the thickness direction x of first wall 110 so that it does not overlap with the orthographic projection of insulating member 16, insulating member 16 is prevented from interfering with protrusion 141 along the thickness direction x of first wall 110. This reduces the difficulty of assembling insulating member 16 and first current collecting member 14, thereby improving the manufacturing efficiency of battery cells 10. Furthermore, compared to a solution in which insulating member 16 supports protrusion 141, thereby protruding from the current collecting members, insulating member 16 can be designed more simply and its material cost can be reduced, thereby facilitating cost control for battery 100.

[0207] In addition, in some embodiments, a portion of the first current collecting member 14 protrudes, and the protruding portion is supported by the insulating member 16. Therefore, when the protruding portion of the first current collecting member 14 is welded to the first wall 110, the welding may be unstable or even melted due to the different materials of the insulating member 16, the first current collecting member 14 and the first wall 110.

[0208] In the embodiment of the present application, along the thickness direction x of the first wall 110, by setting the orthographic projection of the protrusion 141 to not overlap with the orthographic projection of the insulating member 16, the protrusion 141 no longer relies on the insulating member 16 for support, but is fitted with the first wall 110 through self-support, so that the welding between the protrusion 141 and the first wall 110 will not be affected by the insulating member 16, thereby improving the welding stability of the protrusion 141 and the first wall 110.

[0209] According to some embodiments of the present application, referring to FIG. 3 and FIG. 5 , along the thickness direction x of the first wall 110 , a marking portion 17 is provided on a surface of the first wall 110 away from the electrode assembly 13 , and the marking portion 17 is provided corresponding to the protrusion 141 .

[0210] The surface of the first wall 110 away from the electrode assembly 13 may be the outer surface of the first wall 110, and the inner surface of the first wall 110 may be connected to the first current collecting member 14. The marking portion 17 may be a component provided on the outer surface of the first wall 110. The function of the marking portion 17 includes positioning the protrusion 141 located inside the outer shell 11 on the outer side of the outer shell 11, that is, the position of the marking portion 17 corresponds to the position of the protrusion 141 of the first current collecting member 14.

[0211] In some embodiments, the first wall 110 and the protrusion 141 are connected by laser welding, and the laser welding can be based on the marking portion 17 .

[0212] In some embodiments, the marking portion 17 can be a color-coded area provided on the outer surface of the first wall 110 corresponding to the location of the protrusion 141. The marking portion 17 can also be a groove provided on the outer surface of the first wall 110 corresponding to the location of the protrusion 141. The marking portion 17 can also be a notch provided on the outer surface of the first wall 110 corresponding to the location of the protrusion 141.

[0213] In the above technical solution, by providing a marking portion 17 on the outer surface of the first wall 110, it is possible to facilitate positioning of the protrusion 141 in the outer shell 11, reduce the difficulty of welding the first wall 110 and the protrusion 141, improve the welding accuracy of the first wall 110 and the protrusion 141, and reduce the risk of poor welding between the first wall 110 and the protrusion 141, thereby making the battery 100 have higher reliability.

[0214] According to some embodiments of the present application, the marking portion 17 includes a groove formed on the surface of the first wall 110 away from the electrode assembly 13. Alternatively, the marking portion 17 includes an area surrounded by notches formed on the surface of the first wall 110 away from the electrode assembly 13.

[0215] In some embodiments, the marking portion 17 can be formed on the first wall 110 by a stamping process, or a groove can be formed on the surface of the first wall 110 when the first wall 110 is manufactured.

[0216] In some embodiments, the marking portion 17 may be a notch etched on the first wall 110 and corresponding to the outer contour of the protrusion 141 .

[0217] In the above technical solution, by providing a groove corresponding to the first current collecting member 14 or a notch corresponding to the current collecting member on the outer surface of the first wall 110, it is possible to facilitate positioning of the protrusion 141 in the outer shell 11, reduce the difficulty of welding the first wall 110 and the protrusion 141, improve the welding accuracy of the first wall 110 and the protrusion 141, reduce the risk of poor welding between the first wall 110 and the protrusion 141, and thus make the battery 100 have higher reliability.

[0218] According to some embodiments of the present application, the present application further provides a battery 100 , which includes the battery cell 10 of any of the above solutions.

[0219] As shown in FIG. 2 , the battery 100 may further include a box body 20 , in which the battery cells 10 are accommodated.

[0220] In some embodiments, the box body 20 may include a first box body 21 and a second box body 22 . The first box body 21 and the second box body 22 cover each other, and the first box body 21 and the second box body 22 jointly define an assembly space for accommodating the battery cells 10 .

[0221] Optionally, the second box body 22 can be a hollow structure with one end open, and the first box body 21 can be a plate-like structure, and the first box body 21 covers the open side of the second box body 22, so that the first box body 21 and the second box body 22 jointly define an assembly space; the first box body 21 and the second box body 22 can also be hollow structures with one side open, and the open side of the first box body 21 covers the open side of the second box body 22.

[0222] Of course, the box body 20 formed by the first box body 21 and the second box body 22 can be in various shapes, such as a cylinder or a rectangular parallelepiped, etc. For example, in FIG2 , the box body 20 is a rectangular parallelepiped structure.

[0223] Optionally, the number of battery cells 10 disposed in the housing 20 may be one or more. For example, in FIG2 , a plurality of battery cells 10 are disposed in the housing 20 of the battery 100. The plurality of battery cells 10 may be connected in series, in parallel, or in a hybrid connection. A hybrid connection refers to a plurality of battery cells 10 that are connected in both series and parallel connection. The plurality of battery cells 10 may be directly connected in series, in parallel, or in a hybrid connection, and then the entirety formed by the plurality of battery cells 10 may be housed in the housing 20. Of course, the battery 100 may also be a battery module 100 formed by first connecting a plurality of battery cells 10 in series, in parallel, or in a hybrid connection, and then the plurality of battery modules 100 may be formed into a whole by then connecting a plurality of battery cells 10 in series, in parallel, or in a hybrid connection, and then housed in the housing 20.

[0224] The battery 100 may further include other structures. For example, the battery 100 may further include a busbar component, which connects the plurality of battery cells 10 to achieve electrical connection between the plurality of battery cells 10 .

[0225] It should be noted that in some embodiments, the battery 100 may not be provided with a housing 20. The battery 100 includes multiple battery cells 10, and the battery 100 composed of multiple battery cells 10 can be directly assembled on an electrical device to provide electrical energy to the electrical device through the multiple battery cells 10. In other words, the housing 20 can serve as part of the electrical device. Taking the vehicle 1000 as an example, the housing 20 can serve as part of the chassis structure of the vehicle 1000. For example, a portion of the housing 20 can become at least a portion of the floor of the vehicle 1000, or a portion of the housing 20 can become at least a portion of the crossbeam and longitudinal beam of the vehicle 1000.

[0226] According to some embodiments of the present application, the present application further provides an electrical device, which includes the battery cell 10 of any of the above solutions, and the battery cell 10 is used to provide electrical energy to the electrical device.

[0227] According to some embodiments of the present application, a battery cell 10 is provided, as shown in FIG. 3 to FIG. 7 .

[0228] The battery cell 10 includes a housing 11, electrode terminals 12, an electrode assembly 13, a first current collecting member 14, a second current collecting member 15, and an insulator 16. The housing 11 is cylindrical and has a disc-shaped first wall 110. The electrode terminals 12 are insulated on the first wall 110.

[0229] The electrode assembly 13 is accommodated in the outer shell 11. The electrode assembly 13 includes a cylindrical main body 130, a first pole ear 131 and a second pole ear 132. The polarities of the first pole ear 131 and the second pole ear 132 are opposite. The first pole ear 131 and the second pole ear 132 are both arranged at one end of the main body 130 close to the first wall 110. The first pole ear 131 is electrically connected to the first wall 110 through the first current collecting component 14, and the second pole ear 132 is electrically connected to the electrode terminal 12 through the second current collecting component 15.

[0230] The first current collecting member 14 includes a current collecting body 140 and a protrusion 141 . The current collecting body 140 is plate-shaped. In the thickness direction x of the first wall 110 , the lower surface of the current collecting body 140 is connected to the first electrode tab 131 , and the upper surface of the current collecting body 140 is connected to the protrusion 141 .

[0231] The protrusion 141 can be formed on the current collector body 140 through a stamping process. The protrusion 141 includes a top wall 1410, a first side wall 1412, and a second wall. The protrusion 141 extends along the circumferential direction y of the electrode assembly and extends from one end to the other end of the current collector body 140. The first side wall 1412 and the second side wall 1413 are spaced apart from each other along the radial direction of the electrode assembly 13. One end of the first side wall 1412 is connected to the edge of the top wall 1410, and the other end of the first side wall 1412 is connected to the current collector body 140. One end of the second side wall 1413 is connected to the edge of the top wall 1410, and the other end of the second side wall 1413 is connected to the current collector body 140. Supported by the first and second side walls 1412, 1413, the top wall 1410 can stably protrude from the current collector body 140 and connect to the first wall 110, thereby achieving electrical connection between the first electrode tab 131 and the first wall 110.

[0232] The above description is merely a preferred embodiment of the present application and is not intended to limit the present application. Various modifications and variations are possible for those skilled in the art. 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, wherein: include: a housing having a first wall; an electrode terminal, insulated and mounted on the first wall; 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 first wall, the first electrode tab and the second electrode tab are both arranged at one end of the main body facing the first wall, and the second electrode tab is electrically connected to the electrode terminal; The first current collecting component includes a current collecting body and a convex portion. The current collecting body is connected to the first electrode tab. The convex portion protrudes from a side of the current collecting body away from the first electrode tab, and the convex portion is connected to the first wall.

2. The battery cell according to claim 1, wherein: The convex portion includes a top wall and a side wall, the top wall is connected to the first wall, the side wall is connected to the top wall and the current collecting body, and the top wall and the side wall enclose a cavity.

3. The battery cell according to claim 2, wherein: The side wall is arranged around the top wall.

4. The battery cell according to claim 2 or 3, wherein: The side wall includes a first side wall and a second side wall that are oppositely disposed, the first side wall connects the top wall and the current collecting body, and the second side wall connects the top wall and the current collecting body.

5. The battery cell according to claim 4, wherein: The side wall further includes a third side wall, the third side wall connects the top wall and the current collecting body, and the third side wall connects the first side wall and the second side wall.

6. The battery cell according to claim 4 or 5, wherein: The electrode assembly is cylindrical, the convex portion extends along the circumference of the electrode assembly, and the first side wall and the second side wall are arranged opposite to each other along the radial direction of the electrode assembly.

7. The battery cell according to claim 4 or 5, wherein: The electrode assembly is cylindrical, the convex portion extends along the radial direction of the electrode assembly, and the first side wall and the second side wall are arranged opposite to each other along the circumferential direction of the electrode assembly.

8. The battery cell according to any one of claims 1 to 7, wherein: The protrusion extends from one end to the other end of the current collecting body along the circumference of the electrode assembly.

9. The battery cell according to any one of claims 1 to 8, wherein: A plurality of the protrusions are provided, and the plurality of the protrusions are arranged at intervals along the circumferential direction of the electrode assembly.

10. The battery cell according to any one of claims 1 to 9, wherein: The electrode assembly is cylindrical, and along the radial direction of the electrode assembly, the convex portion extends from one end of the current collecting body to the other end.

11. The battery cell according to any one of claims 1 to 10, wherein: The convex portion and the current collecting body are integrally formed.

12. The battery cell according to any one of claims 1 to 11, wherein: The current collecting body has a first surface in contact with the first electrode tab, the protrusion has a second surface in contact with the first wall, and along the thickness direction of the first wall, there is a height difference h between the first surface and the second surface, satisfying h≤5mm.

13. The battery cell according to any one of claims 1 to 12, wherein: The battery cell further includes a second current collecting member, and the second electrode tab and the electrode terminal are electrically connected through the second current collecting member.

14. The battery cell according to claim 13, wherein: The battery cell further includes an insulating member located between the electrode assembly and the first wall, the insulating member being used to separate the first current collecting member and the second current collecting member; Along the thickness direction of the first wall, an orthographic projection of the protrusion and an orthographic projection of the insulating member do not overlap with each other.

15. The battery cell according to any one of claims 1 to 14, wherein: A marking portion is provided on a surface of the first wall away from the electrode assembly along a thickness direction of the first wall, and the marking portion is provided corresponding to the convex portion.

16. The battery cell according to claim 15, wherein: The marking portion includes a groove formed on a surface of the first wall away from the electrode assembly; or, the marking portion includes an area surrounded by notches formed on a surface of the first wall away from the electrode assembly.

17. A battery, wherein: Comprising a battery cell according to any one of claims 1-16.

18. An electrical device, wherein: The invention comprises a battery cell according to any one of claims 1 to 16, wherein the battery cell is used to provide electrical energy.

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