Battery monomer, battery, electric equipment and manufacturing method of battery monomer

Abstract

The embodiment of the invention provides a battery monomer, a battery, electric equipment and a manufacturing method of the battery monomer, and belongs to the technical field of batteries. The battery monomer comprises an electrode assembly and an electrode lead-out piece; the electrode assembly comprises a body and a tab; the electrode leading-out piece is used for leading out electric energy of the electrode assembly and comprises a first part; wherein the tab comprises a first connecting section and a second connecting section which are connected in sequence, the first connecting section is connected to the body, the second connecting section is bent relative to the first connecting section, and at least one of the first connecting section and the second connecting section is connected to the first part. The battery monomer has relatively high assembly efficiency.

Description

Battery cell, battery, electrical equipment and method for manufacturing battery cell Technical Field

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

[0002] 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.

[0003] During the battery manufacturing process, battery assembly efficiency is an issue that cannot be ignored. Therefore, how to improve battery assembly efficiency is a technical problem that needs to be solved urgently in battery technology.

[0004] Summary of the Invention

[0005] The purpose of the present application is to provide a battery cell, a battery, an electrical device and a method for manufacturing the battery cell. The battery cell has high assembly efficiency.

[0006] This application is achieved through the following technical solutions:

[0007] In the first aspect, the present application provides a battery cell, comprising an electrode assembly and an electrode lead-out member, the electrode assembly comprising a body and a tab; the electrode lead-out member is used to lead out electrical energy from the electrode assembly, and the electrode lead-out member comprises a first part; wherein, the tab comprises a first connecting segment and a second connecting segment connected in sequence, the first connecting segment being connected to the body, the second connecting segment being bent relative to the first connecting segment, and at least one of the first connecting segment and the second connecting segment being connected to the first part.

[0008] According to the battery cell of the embodiment of the present application, the second connecting section is bent relative to the first connecting section, which can reduce the risk of interference between the tab and other components and improve assembly efficiency; on the other hand, it can reduce the risk of short circuit between the positive and negative poles of the battery cell 20, so that the battery cell has higher reliability.

[0009] According to some embodiments of the present application, the first connecting segment is connected to the first part, and the second connecting segment is located on a side of the first connecting segment facing away from the first part.

[0010] In the above solution, the second connecting section is located on the side of the first connecting section away from the first part, which can reasonably utilize the space on the side of the first connecting section away from the first part and facilitate the assembly of the electrode lead-out member and other components.

[0011] According to some embodiments of the present application, the second connecting segment is bounded to a side of the first connecting segment facing away from the first portion.

[0012] In the above solution, the second connecting section is constrained to the side of the first connecting section away from the first portion, reducing the risk of the second connecting section moving and interfering with other components, thereby reducing the impact of the second connecting section on battery cell assembly.

[0013] According to some embodiments of the present application, the second connecting segment is connected to the first connecting segment.

[0014] In the above solution, the second connecting section is connected to the first connecting section, and no additional components are needed to constrain the first connecting section, thus reducing costs. This can both constrain the second connecting section and ensure that the tab and the electrode lead have a higher current capacity.

[0015] According to some embodiments of the present application, the first connecting segment and the second connecting segment are both electrically connected to the first portion.

[0016] In the above solution, the first connecting section and the second connecting section are both connected to the first portion, so that the electrode tab and the electrode lead-out piece have a higher current capacity.

[0017] According to some embodiments of the present application, the first connecting segment and the second connecting segment are stacked.

[0018] In the above solution, the first connecting section and the second connecting section are stacked, which rationally utilizes the assembly space and reduces space occupancy.

[0019] According to some embodiments of the present application, the tab includes a plurality of sub-tabs stacked together, the plurality of sub-tabs are connected to form a first connecting portion, and the first connecting portion is located in the first connecting section.

[0020] In the above solution, multiple sub-tabs are connected to form the first connecting portion, which, on the one hand, is conducive to the bending of the second connecting section; on the other hand, it is conducive to reducing the damage of the tab during welding with the electrode lead-out piece and improving the current carrying capacity of the tab.

[0021] According to some embodiments of the present application, the electrode tab includes an overlapping area in which multiple sub-electrode tabs overlap with each other and a staggered area in which the ends of the multiple sub-electrode tabs are staggered with each other. The staggered area is connected to the body through the overlapping area, a part of the first connecting portion is located in the overlapping area, and another part of the first connecting portion is located in the staggered area.

[0022] In the above scheme, a part of the first connecting portion is located in the overlapping area, and the other part of the first connecting portion is located in the staggered area. On the one hand, the connection between the electrode tab and the electrode lead-out piece can have a larger current flow capacity. On the other hand, the dimension of the electrode tab along its extension direction can be shorter, saving materials and manufacturing costs.

[0023] According to some embodiments of the present application, the first connection portion includes a first end connected to the main body and a second end connected to the second connection section. Along the direction from the first end to the second end, the size of the first connection portion is L, and the size of the portion of the first connection portion located in the staggered area is L1, satisfying 0.2L≤L1≤0.5L.

[0024] In the above solution, the dimensions of the portion of the first connection located in the staggered region fall within the aforementioned range, enabling the connection between the tab and the electrode lead-out member to have a greater current capacity while also allowing the tab to be relatively short along its extension direction. If L1 is less than 0.2L, the tab will be longer along its extension direction, resulting in wasted material. If L1 is greater than 0.5L, the portion of the first connection located in the staggered region will be larger, affecting the current capacity of the connection between the tab and the electrode lead-out member.

[0025] According to some embodiments of the present application, the first part has a first surface connected to the first connecting segment; the second connecting segment, the first connecting segment and the electrode lead-out member are connected to form a second connecting portion, and along a direction perpendicular to the first surface, the projection of the second connecting portion at least partially overlaps with the projection of the first connecting portion.

[0026] In the above scheme, the projection of the second connecting part at least partially overlaps with the projection of the first connecting part, which facilitates the connection of the second connecting section, the first connecting section and the electrode lead-out piece, reduces the risk of rupture of the sub-electrode ear, and makes the connection between the electrode ear and the electrode lead-out piece have a higher current capacity.

[0027] According to some embodiments of the present application, along a direction perpendicular to the first surface, a projection of the second connecting portion falls within a projection of the first connecting portion.

[0028] In the above solution, the projection of the second connecting portion falls within the projection of the first connecting portion, which can effectively reduce the risk of cracks or breakage caused by direct welding of the multi-layer sub-tabs.

[0029] According to some embodiments of the present application, the first connecting portion includes a first end connected to the main body and a second end connected to the second connecting section. Along the direction from the first end to the second end, the size of the first connecting portion is L, the size of the part of the first connecting portion located in the staggered area is L1, and the size of the second connecting portion is L3, satisfying L1<L3<L.

[0030] In the above scheme, the size of the second connecting part meets the above range, and the second connecting part and the first connecting part have a large overlapping area, which facilitates the connection of the second connecting section, the first connecting section and the electrode lead-out member, and reduces the damage to the sub-electrode ear during welding of the second connecting section, the first connecting section and the electrode lead-out member.

[0031] According to some embodiments of the present application, the first connecting portion includes a first end connected to the body and a second end connected to the second connecting segment. Along the direction from the first end to the second end, the midpoint of the second connecting portion coincides with the midpoint of the first connecting portion.

[0032] In the above solution, the midpoint of the second connecting portion coincides with the midpoint of the first connecting portion, which facilitates the connection between the second connecting section, the first connecting section and the electrode lead-out member.

[0033] According to some embodiments of the present application, along a direction perpendicular to the first surface, a projection of the second connecting segment covers a projection of the first connecting portion.

[0034] In the above solution, the projection of the second connecting section covers the projection of the first connecting portion, which facilitates the connection between the second connecting section and the first connecting section.

[0035] According to some embodiments of the present application, along a direction from an end of the second connecting segment connected to the first connecting segment to a free end of the second connecting segment, the second connecting segment extends beyond the second connecting portion.

[0036] In the above solution, the second connecting section extends beyond the second connecting portion, which can better fix the second connecting section.

[0037] According to some embodiments of the present application, the first connecting portion and / or the second connecting portion are formed by ultrasonic welding.

[0038] In the above solution, the first connecting portion and / or the second connecting portion are formed by ultrasonic welding, so that the respective connecting portions are firmly connected.

[0039] According to some embodiments of the present application, the battery cell further includes an electrode terminal, and the electrode lead-out member is a adapter connecting the electrode tab and the electrode terminal, or the electrode lead-out member is the electrode terminal.

[0040] In the above scheme, when the electrode lead-out piece is a connecting piece connecting the electrode tab and the electrode terminal, it is convenient to transfer the electrical energy of the electrode assembly to the electrode terminal; when the electrode lead-out piece is the electrode terminal, the structure is simple and it is convenient to extract the electrical energy of the electrode assembly.

[0041] According to some embodiments of the present application, the electrode assembly is a laminated structure.

[0042] In the above solution, when the pole pieces are inspected during the lamination process, if one or more pole pieces have defects, they can be discarded and scrapped, and the scrapping cost is relatively low.

[0043] According to some embodiments of the present application, the tab includes a plurality of sub-tabs stacked together, and the heights of the sub-tabs are equal.

[0044] In the above solution, the height of the sub-tab is along the extension direction of the tab, the sub-tab protrudes from the main body, and the heights of the multiple sub-tabs are equal, which is convenient for processing and manufacturing.

[0045] According to some embodiments of the present application, the tab extends from the first end face of the body, the first end face faces the first part, and the tab further includes a root segment connecting the first connecting segment and the body, and the first connecting segment is bent relative to the root segment.

[0046] In the above solution, the first connecting section is connected to the body via the root section, and the first connecting section is bent relative to the root section, which can reasonably utilize the assembly space and improve the energy density of the battery cell.

[0047] According to some embodiments of the present application, the electrode assembly includes a first electrode assembly and a second electrode assembly, the first electrode assembly and the second electrode assembly are respectively provided with pole ears, the pole ears of the first electrode assembly and the pole ears of the second electrode assembly are connected to an electrode lead-out piece, and the second connecting section of the pole ear of the first electrode assembly and the second connecting section of the pole ear of the second electrode assembly extend in opposite directions.

[0048] In the above scheme, the tab of the first electrode assembly and the tab of the second electrode assembly are connected to an electrode lead-out piece, which facilitates the transmission of current in the battery cell; the second connecting section of the tab of the first electrode assembly and the second connecting section of the tab of the second electrode assembly extend in opposite directions, reducing the risk of interference between the tab of the first electrode assembly and the tab of the second electrode assembly.

[0049] In a second aspect, an embodiment of the present application provides a battery, comprising a battery cell as provided in any of the above embodiments.

[0050] In a third aspect, an embodiment of the present application provides an electrical device, comprising a battery cell as provided in any of the above embodiments or a battery as provided in any of the above embodiments, wherein the battery cell or the battery is used to provide electrical energy.

[0051] In a fourth aspect, an embodiment of the present application provides a method for manufacturing a battery cell, comprising: gathering a plurality of stacked sub-tabs of an electrode assembly to form a tab, the tab comprising a first connecting segment and a second connecting segment connected in sequence, the first connecting segment being connected to the body of the electrode assembly; bending the second connecting segment relative to the first connecting segment; and connecting at least one of the second connecting segment and the first connecting segment to the first part of the electrode lead-out member.

[0052] According to the manufacturing method of the battery cell of the embodiment of the present application, the second connecting section is bent relative to the first connecting section, which can reduce the risk of interference between the tab and other components, facilitate the assembly of the battery cell, and improve the assembly efficiency; on the other hand, it can reduce the risk of short circuit between the positive and negative poles of the battery cell. The battery cell manufactured using this manufacturing method has higher reliability.

[0053] According to some embodiments of the present application, the multiple sub-electrode ears stacked in the electrode assembly are gathered, including: connecting the multiple sub-electrode ears to form a first connecting portion; and bending the second connecting segment relative to the first connecting segment, including: bending the electrode ear at one end of the first connecting portion away from the main body to form a second connecting segment.

[0054] In the above solution, multiple sub-tabs are connected to form a first connecting portion, so that the multiple sub-tabs have a compact structure and are convenient for gathering the electrical energy of the multiple sub-tabs; the tab is bent at the end of the first connecting portion away from the body to facilitate bending the tab.

[0055] According to some embodiments of the present application, connecting at least one of the second connecting segment and the first connecting segment to the first portion of the electrode lead-out member includes: connecting the second connecting segment, the first connecting portion, and the electrode lead-out member to form a second connecting portion.

[0056] In the above solution, the second connecting section, the first connecting portion and the electrode lead-out piece are connected to form the second connecting portion, which can not only constrain the second connecting section but also enable the tab and the electrode lead-out piece to have a higher current capacity.

[0057] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] 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.

[0059] FIG1 is a schematic structural diagram of a vehicle provided in some embodiments of the present application;

[0060] FIG2 is an exploded view of a battery provided in some embodiments of the present application;

[0061] FIG3 is an exploded view of a battery cell provided in some embodiments of the present application;

[0062] FIG4 is a cross-sectional view of a battery cell provided in some embodiments of the present application;

[0063] FIG5 is a schematic diagram of the positions of the second connecting segment and the first connecting segment provided in some embodiments of the present application;

[0064] FIG6 is a schematic diagram of the positions of the second connecting section and the first connecting section provided in some other embodiments of the present application;

[0065] FIG7 is a schematic diagram of a second connecting segment being bound to a first connecting segment according to some embodiments of the present application;

[0066] FIG8 is a schematic diagram of the structure of a tab provided in some embodiments of the present application;

[0067] FIG9 is a schematic diagram of a projection of a second connecting portion and a projection of a first connecting portion provided by some embodiments of the present application;

[0068] FIG10 is a schematic diagram of sub-tab heights provided in some embodiments of the present application;

[0069] FIG11 is a cross-sectional view of a battery cell provided in some other embodiments of the present application;

[0070] FIG12 is a schematic diagram of the assembly of two electrode assemblies and electrode lead-out members provided in some embodiments of the present application;

[0071] FIG13 is a schematic flow chart of a method for manufacturing a battery cell according to some embodiments of the present application;

[0072] In the drawings, the drawings are not drawn to scale.

[0073] Marking instructions: 100 - battery; 10 - housing; 11 - first sub-housing; 12 - second sub-housing; 20 - battery cell; 21 - housing; 211 - shell; 212 - cover; 22 - electrode assembly; 22a - first electrode assembly; 22b - second electrode assembly; 221 - body; 2211 - first end face; 222 - tab; 2221 - first connecting section; 2222 - second connecting section; 2223 - sub-tab; 2224 - overlapping area; 2225 - staggered area; 2226 - first bending section; 2227 - root section; 2228 - second bending section; 23-electrode lead-out member; 231-first portion; 2311-first surface; 2312-second surface; 24-first connecting portion; 241-first end; 242-second end; 25-second connecting portion; 26-electrode terminal; 200-controller; 300-motor; 1000-vehicle. DETAILED DESCRIPTION

[0074] 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 and completely 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.

[0075] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as commonly understood by technicians in the technical field to which this application belongs; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0076] The terms "first", "second" and the like 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.

[0077] 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. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

[0078] 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.

[0079] 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.

[0080] The term "multiple" in this application refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0081] The battery mentioned in the embodiments of the present application may include one or more battery cells to provide a single physical module with higher voltage and capacity. When there are multiple battery cells, the multiple battery cells are connected in series, in parallel or in hybrid through electrical connectors.

[0082] 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.

[0083] 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.

[0084] 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.

[0085] In some embodiments, the battery may be an energy storage device, including an energy storage container, an energy storage cabinet, and the like.

[0086] 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.

[0087] 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.

[0088] 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.

[0089] 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.

[0090] 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.

[0091] As an example, the positive electrode current collector may be a metal foil or a composite current collector. For example, as the metal foil, aluminum or stainless steel with a silver surface treatment, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium, etc. may be used. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector may be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0092] 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 conventional materials that can be used as positive electrode active materials for batteries may also be used.

[0093] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0094] As an example, the negative electrode current collector may be a metal foil or a composite current collector. For example, the metal foil may be silver-surface-treated aluminum or stainless steel, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, or titanium.

[0095] In some embodiments, the negative electrode current collector has two opposite surfaces in its thickness direction, and the negative electrode active material is disposed on either or both of the two opposite surfaces of the negative electrode current collector.

[0096] As an example, the negative electrode active material may be a negative electrode active material for a battery 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.

[0097] In some embodiments, the separator is a separator. The present application has no particular limitation on the type of separator, and any known separator with a porous structure having good chemical and mechanical stability can be selected.

[0098] As an example, the primary material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic. The separator can be a single-layer film or a multi-layer composite film, without particular limitation. When the separator is a multi-layer composite film, the materials of each layer can be the same or different, without particular limitation. 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.

[0099] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive electrode and the negative electrode, and serves to both transport ions and isolate the positive and negative electrodes.

[0100] 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.

[0101] In some embodiments, the electrode assembly is a laminate structure.

[0102] In some embodiments, a battery cell may include a housing. The housing is used to encapsulate components such as the electrode assembly and the electrolyte. The housing may be a steel housing, an aluminum housing, a plastic housing (e.g., polypropylene), a composite metal housing (e.g., a copper-aluminum composite housing), or an aluminum-plastic film.

[0103] In some embodiments, the housing includes an end cap and a shell. The shell has an opening, and the end cap closes the opening to form a sealed space for accommodating the electrode assembly, electrolyte, and other substances. The shell may have one or more openings. One or more end caps may also be provided.

[0104] In some embodiments, the housing is provided with at least one electrode terminal, which is electrically connected to a tab of the electrode assembly. The electrode terminal may be directly connected to the tab or indirectly connected to the tab via an adapter. The electrode terminal may be provided on an end cap or on the housing.

[0105] In some embodiments, the housing is provided with an explosion-proof valve for releasing the internal pressure of the battery cell.

[0106] As an example, the battery cells can be cylindrical, prismatic, soft-pack, or other shaped. Prismatic cells include prismatic, blade-shaped, and polygonal cells. Polygonal cells, for example, hexagonal cells, are not particularly limited in this embodiment. Referring to FIG3 , this embodiment uses a prismatic cell as an example.

[0107] The development of battery technology must take into account multiple design factors at the same time, such as energy density, discharge capacity, charge and discharge rate and other performance parameters. In addition, the assembly efficiency of the battery also needs to be considered.

[0108] The electrode assembly includes a body and a tab, and the tab extends from the end of the body. In the related art, in order to facilitate the connection between the tab and the electrode lead-out piece, the tab protrudes from the body larger along the extension direction of the tab, that is, the height of the tab is higher. After the tab is connected to the electrode assembly, the tab has a redundant part. During the assembly process of the battery cell, the redundant part of the tab is easy to interfere with other components (such as the shell, body, etc.), affecting the assembly efficiency of the battery cell.

[0109] In view of this, in order to solve the problem of the redundant part of the tab causing the assembly efficiency of the battery cell, the inventors conducted in-depth research and designed a technical solution to bend the end of the tab away from the body, thereby reducing the impact of the tab on the assembly of the battery cell and improving the assembly efficiency.

[0110] The battery disclosed in the embodiments of the present application can be used, but is not limited to, in electrical equipment such as vehicles, ships, or aircraft. A power supply system of the electrical equipment can be composed of the battery cells and batteries disclosed in the present application.

[0111] The embodiments of the present application provide 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 computer, a laptop computer, an electric toy, an electric tool, an electric bicycle, an electric motorcycle, 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.

[0112] For the convenience of description, the following embodiments are described by taking a vehicle as an example of an electrical device in an embodiment of the present application.

[0113] Please refer to Figure 1, which is a schematic diagram of the structure of the vehicle provided in some embodiments of the present application. 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, and the battery 100 can be provided at the bottom, head or 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 for the vehicle 1000, for the circuit system of the vehicle 1000, such as for the working power requirements during the startup, navigation and operation of the vehicle 1000.

[0114] The vehicle 1000 may further include a controller 200 and a motor 300 . The controller 200 is used to control the battery 100 to supply power to the motor 300 , for example, to meet the power requirements of the vehicle 1000 during startup, navigation, and driving.

[0115] In some embodiments of the present application, the battery 100 can serve not only as an operating power source for the vehicle 1000, but also as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0116] Please refer to Figure 2, which is an exploded view of a battery provided in some embodiments of the present application. The battery 100 includes a housing 10 and a battery cell 20, with the battery cell 20 being housed within the housing 10. The housing 10 is used to provide a storage space for the battery cell 20, and the housing 10 can adopt a variety of structures. In some embodiments, the housing 10 can include a first sub-housing 11 and a second sub-housing 12, which cover each other and together define a storage space for accommodating the battery cell 20. The second sub-housing 12 can be a hollow structure with one end open, and the first sub-housing 11 can be a plate-like structure, with the first sub-housing 11 covering the open side of the second sub-housing 12, so that the first sub-housing 11 and the second sub-housing 12 jointly define a storage space; the first sub-housing 11 and the second sub-housing 12 can also be hollow structures with one end open, with the open side of the first sub-housing 11 covering the open side of the second sub-housing 12.

[0117] In the battery 100, there may be multiple battery cells 20, and the multiple battery cells 20 may be connected in series, in parallel, or in a hybrid connection. A hybrid connection refers to a combination of series and parallel connections among the multiple battery cells 20. The multiple battery cells 20 may be directly connected in series, in parallel, or in a hybrid connection, and then the entire battery cell 20 may be housed within the housing 10. Alternatively, the battery 100 may be constructed by first connecting multiple battery cells 20 in series, in parallel, or in a hybrid connection to form a battery module, which is then connected in series, in parallel, or in a hybrid connection to form a complete battery module, and then housed within the housing 10. The battery 100 may also include other structures, such as a busbar assembly for electrically connecting the multiple battery cells 20.

[0118] Please refer to Figure 3, which is an exploded view of a battery cell provided in some embodiments of the present application. As shown in Figure 3, a battery cell 20 includes a housing 21, an electrode assembly 22, and other functional components. Housing 21 includes a shell 211 and a cover 212. Shell 211 has an opening, and cover 212 closes the opening, isolating the internal environment of battery cell 20 from the external environment.

[0119] The shell 211 is a component used to cooperate with the cover 212 to form the internal environment of the battery cell 20, wherein the formed internal environment can be used to accommodate the electrode assembly 22, electrolyte and other components. The shell 211 and the cover 212 can be independent components. The shell 211 can be of various shapes and sizes. Specifically, the shape of the shell 211 can be determined according to the specific shape and size of the electrode assembly 22. The material of the shell 211 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiment of the present application does not impose any special restrictions on this. The embodiment of the present application takes the shell 211 as a rectangular parallelepiped as an example.

[0120] The cover 212 refers to a component that covers the opening of the shell 211 to isolate the internal environment of the battery cell 20 from the external environment. Without limitation, the shape of the cover 212 can be adapted to the shape of the shell 211 to match the shell 211. Optionally, the cover 212 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the cover 212 is not easily deformed when squeezed or collided, so that the battery cell 20 can have a higher structural strength and the safety performance can also be improved. Functional components such as electrode terminals 26 can be provided on the cover 212. The electrode terminal 26 can be used to electrically connect to the electrode assembly 22 for outputting or inputting electrical energy of the battery cell 20. The material of the cover 212 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not impose any special restrictions on this. In some embodiments, an insulating structure may be provided inside the cover 212 to isolate the electrical connection components in the housing 211 from the cover 212 to reduce the risk of short circuits. For example, the insulating structure may be made of plastic, rubber, or the like.

[0121] The portions of the positive and negative electrodes containing active material constitute the body 221 of the electrode assembly 22, while the portions of the positive and negative electrodes without active material each constitute a tab 222. The positive and negative tabs can be located together at one end of the body or separately at both ends of the body.

[0122] Please refer to Figure 4, which is a cross-sectional view of a battery cell provided in some embodiments of the present application. According to some embodiments of the present application, the present application provides a battery cell 20, which includes an electrode assembly 22 and an electrode lead-out member 23. The electrode assembly 22 includes a body 221 and a tab 222; the electrode lead-out member 23 is used to conduct electrical energy from the electrode assembly 22, and the electrode lead-out member 23 includes a first portion 231. The tab 222 includes a first connecting segment 2221 and a second connecting segment 2222 connected in sequence, the first connecting segment 2221 is connected to the body 221, the second connecting segment 2222 is bent relative to the first connecting segment 2221, and at least one of the first connecting segment 2221 and the second connecting segment 2222 is connected to the first portion 231.

[0123] The tab 222 extends from the body 221, and the second connecting segment 2222 is located at the end of the tab 222 away from the body 221. Along the extension direction of the tab 222, or in the unfolded state of the tab 222, the end of the tab 222 connected to the body 221 can be the head end of the tab 222, and the end of the tab 222 away from the body 221 can be the tail end of the tab 222. The second connecting segment 2222 can be located at the tail end relative to the first connecting segment 2221.

[0124] In the figure, the direction indicated by the letter U is the extending direction of the tab 222 .

[0125] The first portion 231 is a portion of the electrode lead-out member 23 used for connecting to the electrode tab 222 . The first portion 231 is electrically connected to the electrode tab 222 to guide the electrical energy of the electrode assembly 22 to the electrode lead-out member 23 .

[0126] The electrode lead-out member 23 is used to guide the electrical energy of the electrode assembly 22 to the outside of the battery cell 20 .

[0127] At least one of the first connecting segment 2221 and the second connecting segment 2222 is connected to the first part 231. The first connecting segment 2221 may be connected to the first part 231, the second connecting segment 2222 may be connected to the first part 231, or both the first connecting segment 2221 and the second connecting segment 2222 may be connected to the first part 231.

[0128] The second connecting segment 2222 is bent relative to the first connecting segment 2221 . That is, the end of the tab 222 is bent relative to the first connecting segment 2221 .

[0129] As an example, referring to FIG. 4 , the second connecting segment 2222 is bent 180 degrees relative to the first connecting segment 2221 .

[0130] According to the battery cell 20 of the embodiment of the present application, the second connecting section 2222 is bent relative to the first connecting section 2221, that is, the end of the pole ear 222 is bent. On the one hand, it can reduce the risk of interference between the pole ear 222 and other components (such as the outer shell, the pole ear 222 of another electrode assembly 22, etc.), thereby reducing the influence of the pole ear 222 on the assembly of the electrode cell 20 and improving the assembly efficiency; on the other hand, it can reduce the risk of short circuit between the positive and negative poles of the battery cell 20 and improve the reliability of the battery cell.

[0131] Please refer to Figure 5, which is a schematic diagram of the positions of the second connecting segment and the first connecting segment provided in some embodiments of the present application. In some embodiments, the second connecting segment 2222 can be located on the side of the first part 231 facing away from the first connecting segment 2221, that is, the second connecting segment 2222 can be bent relative to the first connecting segment 2221 toward the side of the first part 231 facing away from the first connecting segment 2221.

[0132] In this case, the second connecting section 2222 can be bounded to a side of the first portion 231 facing away from the first connecting section 2221. The second connecting section 2222 can be connected to the first portion 231, or the second connecting section 2222 and the first connecting section 2221 can be connected to opposite sides of the first portion 231. For example, as shown in FIG5 , the first portion 231 can have a first surface 2311 facing the body 221 and a second surface 2312 facing away from the body 221. The second connecting section 2222 can be connected to the second surface 2312, and the first connecting section 2221 can be connected to the first surface 2311.

[0133] Please refer to Figure 6, which is a schematic diagram of the positions of the second connecting segment and the first connecting segment provided in some other embodiments of the present application. According to some embodiments of the present application, the first connecting segment 2221 is connected to the first portion 231, and the second connecting segment 2222 is located on a side of the first connecting segment 2221 facing away from the first portion 231.

[0134] The first connecting section 2221 is connected to the first portion 231 . The electrical energy of the electrode assembly 22 is transferred to the first portion 231 via the first connecting section 2221 and then led out via the electrode lead-out member 23 .

[0135] The second connecting segment 2222 is bent toward the side of the first connecting segment 2221 facing away from the first portion 231 , so that the second connecting segment 2222 is located on the side of the first connecting segment 2221 facing away from the first portion 231 .

[0136] In the above solution, the second connecting section 2222 is located on the side of the first connecting section 2221 away from the first part 231, which can reasonably utilize the space on the side of the first connecting section 2221 away from the first part 231 and facilitate the assembly of the electrode lead 23 with other components.

[0137] Please refer to Figure 7, which is a schematic diagram of the second connecting segment being bound to the first connecting segment according to some embodiments of the present application. According to some embodiments of the present application, the second connecting segment 2222 is bound to a side of the first connecting segment 2221 facing away from the first portion 231.

[0138] The second connecting segment 2222 is constrained to the side of the first connecting segment 2221 facing away from the first part 231. The second connecting segment 2222 can be constrained to the side of the first connecting segment 2221 facing away from the first part 231 by a constraining member. For example, the constraining member can be a tape, which constrains the second connecting segment 2222 to the side of the first connecting segment 2221 facing away from the first part 231; or, the constraining member can be a component arranged in the outer shell 21 of the battery cell 20, such as an insulating member, a bracket, etc.; or the second connecting segment 2222 can be welded to the first connecting segment 2221 to constrain the second connecting segment 2222.

[0139] The restraint member can limit the movement of the second connecting segment 2222 relative to the electrode lead-out member 23 .

[0140] In the above solution, the second connecting segment 2222 is bounded to the side of the first connecting segment 2221 away from the first portion 231 , reducing the risk of the second connecting segment 2222 interfering with other components, thereby reducing the impact of the second connecting segment 2222 on the assembly of the battery cell 20 .

[0141] 7 , according to some embodiments of the present application, the second connecting segment 2222 is connected to the first connecting segment 2221. The second connecting segment 2222 is connected to the first connecting segment 2221 by welding the second connecting segment 2222 to the first connecting segment 2221, or by connecting the second connecting segment 2222 to the first connecting segment 2221 via a fixing member (such as tape, conductive adhesive, etc.).

[0142] The restraining member and the fixing member may be the same component or different components.

[0143] The second connecting segment 2222 may be connected to the first portion 231 through the first connecting segment 2221 . For example, the second connecting segment 2222 , the first connecting segment 2221 and the first portion 231 may be welded together.

[0144] In the above solution, the second connecting section 2222 is connected to the first connecting section 2221, and no additional components are required to constrain the first connecting section 2221, which facilitates manufacturing and reduces costs. In some embodiments, the second connecting section 2222 can be electrically connected to the first connecting section 2221.

[0145] In the above solution, the second connecting section 2222 is connected to the first connecting section 2221 , which can not only constrain the second connecting section 2222 , but also enable the tab 222 and the electrode lead-out member 23 to have a higher current capacity.

[0146] 5 and 7 , according to some embodiments of the present application, the first connecting segment 2221 and the second connecting segment 2222 are both electrically connected to the first portion 231 .

[0147] The first connecting segment 2221 and the second connecting segment 2222 are both electrically connected to the first part 231. The first connecting segment 2221 and the second connecting segment 2222 are electrically connected to the opposite sides of the first part 231 respectively; or the second connecting segment 2222 is electrically connected to the first part 231 through the first connecting segment 2221. For example, the second connecting segment 2222, the first connecting segment 2221 and the first part 231 are stacked and welded together.

[0148] In the above solution, the first connecting section 2221 and the second connecting section 2222 are both electrically connected to the first portion 231 , so that the electrode tab 222 and the electrode lead-out member 23 have a higher current capacity.

[0149] 5 and 7 , according to some embodiments of the present application, the first connecting segment 2221 and the second connecting segment 2222 are stacked.

[0150] The first portion 231 may have a first surface 2311 facing the body 221, and the first connecting segment 2221 and the second connecting segment 2222 may be stacked in a direction intersecting the first surface 2311. Alternatively, the first connecting segment 2221 and the second connecting segment 2222 may be stacked in a direction perpendicular to the first surface 2311. In other words, the first portion 231, the first connecting segment 2221, and the second connecting segment 2222 may be stacked, for example, the second connecting segment 2222, the first connecting segment 2221, and the first portion 231 may be arranged in parallel.

[0151] In the above solution, the first connecting section 2221 and the second connecting section 2222 are stacked, which rationally utilizes the assembly space and reduces space occupancy.

[0152] Please refer to Figure 8, which is a schematic diagram of the structure of the tab provided in some embodiments of the present application. According to some embodiments of the present application, the tab 222 includes a plurality of stacked sub-tabs 2223, which are connected to form a first connecting portion 24, which is located in the first connecting section 2221.

[0153] Multiple sub-tabs 2223 are stacked and connected to form a first connecting portion 24. On the one hand, this is beneficial to the bending of the second connecting section 2222; on the other hand, it is beneficial to reduce the damage of the tab 222 during the welding process with the electrode lead-out piece 23, thereby improving the current carrying capacity of the tab 222.

[0154] Please refer to Figure 8. According to some embodiments of the present application, the pole tab 222 includes an overlapping area 2224 in which multiple sub-pole tabs 2223 overlap with each other and a staggered area 2225 in which the ends of the multiple sub-pole tabs 2223 are staggered with each other. The staggered area 2225 is connected to the main body 221 through the overlapping area 2224. A part of the first connecting portion 24 is located in the overlapping area 2224, and another part of the first connecting portion 24 is located in the staggered area 2225.

[0155] The staggered area 2225 is connected to the main body 221 through the overlapping area 2224 . A portion of the first connecting portion 24 is located in the overlapping area 2224 , another portion of the first connecting portion 24 is located in the staggered area 2225 , and the second connecting end is located in the staggered area 2225 .

[0156] The multiple sub-pole tabs 2223 are gathered and connected to form a first connecting portion 24, so that the ends of the multiple sub-pole tabs 2223 away from the main body 221 form a staggered area 2225, and the parts of the multiple sub-pole tabs 2223 close to the main body 221 form an overlapping area 2224, and the staggered area 2225 is connected to the main body 221 through the overlapping area 2224.

[0157] In the above scheme, a part of the first connecting portion 24 is located in the overlapping area 2224, and the other part of the first connecting portion 24 is located in the staggered area 2225. On the one hand, the connection between the pole ear 222 and the electrode lead-out piece 23 can have a larger current flow capacity. On the other hand, the dimension of the pole ear 222 along its extension direction can be shorter, saving materials and manufacturing costs.

[0158] As shown in Figure 8 , in the finished battery cell 20, the electrode lead-out member 23 and the tab 222 are aligned in the Y direction, while the body 221 and the tab 222 are aligned in the X1 direction. Alternatively, as shown in Figure 7 , during assembly of the battery cell 20, the first connecting section 2221 is bent relative to the body 221 so that the electrode lead-out member 23 and the body 221 are aligned in the Y direction. In other words, the first end surface 2211 of the body 221, extending from the tab 222, faces the first portion 231.

[0159] Please refer to Figure 8. According to some embodiments of the present application, the first connecting portion 24 includes a first end 241 connected to the main body 221 and a second end 242 connected to the second connecting section 2222. Along the direction (X1) from the first end 241 to the second end 242, the size of the first connecting portion 24 is L, and the size of the portion of the first connecting portion 24 located in the staggered area 2225 is L1, satisfying 0.2L≤L1≤0.5L.

[0160] Along the extension direction of the tab 222, the first end 241 is closer to the body 221, and the second end 242 is closer to the second connecting section 2222. As shown in FIG8 , the direction indicated by letter X1 in the figure may be the direction from the first end 241 to the second end 242.

[0161] Optionally, the direction from the first end 241 to the second end 242 (X1 direction) may be parallel to the first surface 2311 .

[0162] Alternatively, L1 may be 0.2L, 0.3L, 0.4L or 0.5L.

[0163] When the first connecting segment 2221 is connected to the first portion 231, the size of the portion of the first connecting portion 24 located in the staggered region 2225 satisfies the aforementioned range. This allows the connection between the tab 222 and the electrode lead-out member 23 to have a greater flow capacity while also shortening the tab 222 along its extension direction. If L1 is less than 0.2L, the tab 222 will be longer along its extension direction, resulting in wasted material. If L1 is greater than 0.5L, the portion of the first connecting portion 24 located in the staggered region 2225 will be larger, affecting the flow capacity of the connection between the tab 222 and the electrode lead-out member 23.

[0164] According to some embodiments of the present application, 0.3L≤L1≤0.4L.

[0165] Compared with 0.2L≤L1≤0.5L, when 0.3L≤L1≤0.4L, the connection between the electrode tab 222 and the electrode lead-out member 23 can have a larger current flow capacity, and the dimension of the electrode tab 222 along its extension direction can be shorter.

[0166] Alternatively, L1 may be 0.3L, 0.31L, 0.32L, 0.33L, 0.34L, 0.35L, 0.36L, 0.37L, 0.38L, 0.39L or 0.4L.

[0167] Please refer to Figures 4 and 8, and further to Figure 9, which is a schematic diagram of the projection of the second connecting portion and the projection of the first connecting portion provided in some embodiments of the present application. According to some embodiments of the present application, the first portion 231 has a first surface 2311 connected to the first connecting segment 2221; the second connecting segment 2222, the first connecting segment 2221, and the electrode lead-out member 23 are connected to form the second connecting portion 25. Along the direction perpendicular to the first surface 2311 (the Y direction), the projection of the second connecting portion 25 at least partially overlaps with the projection of the first connecting portion 24.

[0168] The direction indicated by the letter Y in the figure is a direction perpendicular to the first surface 2311 .

[0169] The first surface 2311 is a surface of the first portion 231 for connecting with the first connecting segment 2221. Optionally, the first surface 2311 may be disposed facing the body 221.

[0170] The second connecting section 2222 is connected to the first surface 2311 through the first connecting section 2221 to form a second connecting portion 25 .

[0171] Along a direction perpendicular to the first surface 2311 , the projection of the second connection portion 25 may partially overlap with the projection of the first connection portion 24 , or the projection of the second connection portion 25 may completely overlap with the projection of the first connection portion 24 .

[0172] The first connecting portion 24 connects the plurality of sub-electrode tabs 2223 , and the projection of the second connecting portion 25 at least partially overlaps with the projection of the first connecting portion 24 , so as to facilitate welding of the second connecting segment 2222 , the first connecting portion 24 and the electrode lead-out member 23 .

[0173] If the second connecting portion 25 does not overlap with the first connecting portion 24, when the second connecting segment 2222, the first connecting segment 2221 and the electrode lead-out member 23 are welded, it is easy to cause some of the multiple sub-tabs 2223 to be damaged, thereby reducing the flow capacity of the connection between the tab 222 and the electrode lead-out member 23.

[0174] In the above scheme, the projection of the second connecting part 25 at least partially overlaps with the projection of the first connecting part 24, which facilitates the connection between the second connecting section 2222, the first connecting section 2221 and the electrode lead-out piece 23, reduces the risk of rupture of the sub-pole ear 2223, and makes the connection between the pole ear 222 and the electrode lead-out piece 23 have a higher current capacity.

[0175] 9 , according to some embodiments of the present application, along a direction perpendicular to the first surface 2311 (Y direction), the projection of the second connection portion 25 falls within the projection of the first connection portion 24 .

[0176] Along the direction perpendicular to the first surface 2311 , the projection of the second connection portion 25 falls into the projection of the first connection portion 24 , that is, the projection of the second connection portion 25 is less than or equal to the projection of the first connection portion 24 , so that the projection of the second connection portion 25 completely overlaps with the projection of the first connection portion 24 .

[0177] Since the second connecting section 2222 is located in the staggered area 2225, a part of the first connecting portion 24 is located in the overlapping area 2224, and the other part of the first connecting portion 24 is located in the staggered area 2225, after the second connecting section 2222 is bent relative to the first connecting section 2221 on the side facing away from the first part 231 toward the first connecting section 2221, the second connecting section 2222 is connected to the first connecting section 2221, and the thickness of the second connecting section 2222 and the first connecting section 2221 in the stacking direction are compensated, so that the difference in thickness after the second connecting section 2222 and the first connecting section 2221 overlap is small.

[0178] It should be pointed out that the thickness of the connection between the second connecting section 2222, the first connecting section 2221 and the electrode lead-out member 23 mentioned in the embodiment of the present application refers to the dimensions of the three in the stacking direction after the second connecting section 2222, the first connecting section 2221 and the electrode lead-out member 23 are stacked.

[0179] In the above solution, the projection of the second connecting portion 25 falls within the projection of the first connecting portion 24 , which can effectively reduce the risk of cracks or breakage caused by direct welding of the multi-layer sub-tabs 2223 .

[0180] Please refer to Figure 8. According to some embodiments of the present application, the first connecting portion 24 includes a first end 241 connected to the main body 221 and a second end 242 connected to the second connecting section 2222. Along the direction from the first end 241 to the second end 242 (X1 direction), the size of the first connecting portion 24 is L, the size of the portion of the first connecting portion 24 located in the staggered area 2225 is L1, and the size of the second connecting portion 25 is L3, satisfying the condition that L1<L3<L.

[0181] The first end 241 and the second end 242 are two opposite ends of the first connecting portion 24 along the extending direction of the tab 222 . The first end 241 is used to connect to the body 221 , and the second end 242 is used to connect to the second connecting segment 2222 .

[0182] Observed in a direction perpendicular to the first surface 2311 , along the direction from the first end 241 to the second end 242 , the dimension L3 of the second connection portion 25 is smaller than the dimension L of the first connection portion 24 , and the dimension L3 of the second connection portion 25 is larger than the dimension L1 of the portion of the first connection portion 24 located in the staggered area 2225 .

[0183] In the above scheme, the size of the second connecting part 25 meets the above range, and the second connecting part 25 and the first connecting part 24 have a large overlapping area, which facilitates the connection between the second connecting section 2222, the first connecting section 2221 and the electrode lead-out member 23, and reduces the damage to the sub-electrode ear 2223 when welding the second connecting section 2222, the first connecting section 2221 and the electrode lead-out member 23.

[0184] According to some embodiments of the present application, the first connecting portion 24 includes a first end 241 connected to the main body 221 and a second end 242 connected to the second connecting section 2222. Along the direction from the first end 241 to the second end 242 (X1 direction), the midpoint of the second connecting portion 25 coincides with the midpoint of the first connecting portion 24.

[0185] Along the direction from the first end 241 to the second end 242 , the distances from the midpoint of the second connection portion 25 to both ends of the second connection portion 25 are equal, and the distances from the midpoint of the first connection portion 24 to both ends of the first connection portion 24 are equal.

[0186] In the above solution, the midpoint of the second connecting portion 25 coincides with the midpoint of the first connecting portion 24 , which facilitates the connection between the second connecting segment 2222 , the first connecting segment 2221 and the electrode lead-out member 23 .

[0187] Referring to FIG. 8 , according to some embodiments of the present application, along a direction perpendicular to the first surface 2311 (Y direction), the projection of the second connecting segment 2222 covers the projection of the first connecting portion 24 .

[0188] In the above solution, the projection of the second connecting segment 2222 covers the projection of the first connecting portion 24 , which facilitates the connection between the second connecting segment 2222 and the first connecting segment 2221 .

[0189] 8 , according to some embodiments of the present application, along a direction from one end of the second connecting segment 2222 connected to the first connecting segment 2221 to the free end of the second connecting segment 2222 , the second connecting segment 2222 extends beyond the second connecting portion 25 .

[0190] The free end of the second connecting segment 2222 may be the end of the second connecting segment 2222 away from the first connecting segment 2221. In the embodiment where the second connecting segment 2222 is located on a side of the first connecting segment 2221 away from the first portion 231 and the second connecting segment 2222 is connected to the first connecting segment 2221, along the direction from the second end 242 to the first end 241 (the X2 direction), one end of the second connecting segment 2222 is connected to the first connecting segment 2221, and the other end of the second connecting segment 2222 is a free end.

[0191] The second connecting section 2222 extends beyond the second connecting portion 25 , which means that, along the direction from the second end 242 to the first end 241 , an end of the second connecting section 2222 away from the first connecting section 2221 extends beyond the second connecting portion 25 .

[0192] The tab 222 may further include a first bending section 2226 , through which the first connecting section 2221 and the second connecting section 2222 are connected. The end of the second connecting section 2222 away from the first connecting section 2221 may be the end of the second connecting section 2222 away from the first bending section 2226 .

[0193] In the above solution, the second connecting section 2222 extends beyond the second connecting portion 25 , which can better fix the second connecting section 2222 .

[0194] According to some embodiments of the present application, the first connection portion 24 and / or the second connection portion 25 are formed by ultrasonic welding.

[0195] In the above solution, the first connection portion 24 and / or the second connection portion 25 are formed by ultrasonic welding, so that the respective connections are firmly connected.

[0196] According to some embodiments of the present application, the battery cell 20 further includes an electrode terminal 26 , and the electrode lead-out member 23 is a transition piece connecting the electrode tab 222 and the electrode terminal 26 , or the electrode lead-out member 23 is the electrode terminal 26 .

[0197] In the above scheme, when the electrode lead-out piece 23 is a connecting piece connecting the electrode tab 222 and the electrode terminal 26, it is convenient to transfer the electrical energy of the electrode assembly 22 to the electrode terminal 26; when the electrode lead-out piece 23 is the electrode terminal 26, the structure is simple and it is convenient to extract the electrical energy of the electrode assembly 22.

[0198] When the electrode lead-out member 23 is a transition member, the electrode lead-out member 23 further includes a second portion (not shown) for connecting to the electrode terminal 26. The second portion can be bent relative to the first portion 231 to facilitate connection to the electrode terminal 26.

[0199] According to some embodiments of the present application, the electrode assembly 22 is a laminated structure.

[0200] The electrode assembly 22 is a laminated structure, in which the positive electrode sheet, the separator and the negative electrode sheet are stacked.

[0201] In the above solution, when the pole pieces are inspected during the lamination process, if one or more pole pieces have defects, they can be discarded and scrapped, and the scrapping cost is relatively low.

[0202] According to some embodiments of the present application, the tab 222 includes a plurality of sub-tabs 2223 that are stacked, and the heights of the plurality of sub-tabs 2223 are equal.

[0203] Please refer to FIG. 10 , which is a schematic diagram of the height of sub-tabs provided in some embodiments of the present application. In the figure, the dimension indicated by the letter Z is the height of a sub-tab 2223 .

[0204] In the above solution, the height of the sub-tab 2223 is the size of the tab 2223 protruding from the main body 221 along the extension direction of the tab 222 when the tab 222 is in the unfolded (unbent) state. The heights of multiple sub-tabs 2223 are equal, which is convenient for processing and manufacturing.

[0205] Please refer to Figures 4 and 11. According to some embodiments of the present application, the tab 222 extends from the first end surface 2211 of the main body 221, and the first end surface 2211 faces the first portion 231. The tab 222 also includes a root segment 2227, which connects the first connecting segment 2221 and the main body 221. The first connecting segment 2221 is bent relative to the root segment 2227.

[0206] The first end surface 2211 is a surface of the body 221 close to the first portion 231 , and the tab 222 extends from the first end surface 2211 .

[0207] The tab 222 may further include a second bending segment 2228 , which connects the root segment 2227 and the first connecting segment 2221 .

[0208] The first connecting segment 2221 may be connected to the first portion 231 , the second connecting segment 2222 may be located on a side of the first connecting segment 2221 away from the first portion 231 , and the second connecting segment 2222 , the first connecting segment 2221 and the electrode lead-out member 23 are connected.

[0209] In the above solution, the first connecting section 2221 is connected to the body 221 via the root section 2227 . The first connecting section 2221 is bent relative to the root section 2227 , which can reasonably utilize the assembly space and improve the energy density of the battery cell 20 .

[0210] Please refer to Figures 11 and 12. Figure 11 is a cross-sectional view of a battery cell provided in some other embodiments of the present application, and Figure 12 is a schematic diagram of the assembly of two electrode assemblies and electrode lead-out members provided in some embodiments of the present application. According to some embodiments of the present application, the electrode assembly 22 includes a first electrode assembly 22a and a second electrode assembly 22b. The first electrode assembly 22a and the second electrode assembly 22b are respectively provided with a tab 222. The tab 222 of the first electrode assembly 22a and the tab 222 of the second electrode assembly 22b are connected to an electrode lead-out member 23. The second connecting section 2222 of the tab 222 of the first electrode assembly 22a and the second connecting section 2222 of the tab 222 of the second electrode assembly 22b extend in opposite directions.

[0211] The first connecting segment 2221 of the pole lug 222 of the first electrode assembly 22a and the first connecting segment 2221 of the pole lug 222 of the second electrode assembly 22b are connected to the first part 231 of an electrode assembly 22, and the second connecting segment 2222 of the pole lug 222 of the first electrode assembly 22a and the second connecting segment 2222 of the pole lug 222 of the second electrode assembly 22b extend in directions away from each other, thereby reducing the risk of interference between the pole lug 222 of the first electrode assembly 22a and the pole lug 222 of the second electrode assembly 22b.

[0212] In the above solution, the tab 222 of the first electrode assembly 22 a and the tab 222 of the second electrode assembly 22 b are connected to one electrode lead-out member 23 , so as to facilitate the transmission of current of the battery cell 20 .

[0213] According to some embodiments of the present application, a battery 100 is further provided. The battery 100 includes the battery cell 20 provided in any of the above embodiments.

[0214] According to some embodiments of the present application, an electrical device is further provided, which includes the battery cell 20 provided by any of the above embodiments or the battery 100 provided by any of the above embodiments, and the battery cell 20 or the battery 100 is used to provide electrical energy.

[0215] The power-consuming device may be any of the above-mentioned devices or systems using the battery 100 .

[0216] The battery cell 20, battery 100 and electrical equipment according to the embodiment of the present application are described above. The manufacturing method of the battery cell according to the embodiment of the present application will be described below. For parts not described in detail, please refer to the aforementioned embodiments.

[0217] FIG13 is a schematic flow chart of a method for manufacturing a battery cell according to some embodiments of the present application. According to some embodiments of the present application, as shown in FIG13 , the present application further provides a method 400 for manufacturing a battery cell, the method 400 comprising:

[0218] S410 , folding the plurality of stacked sub-tabs 2223 of the electrode assembly 22 to form a tab 222 , wherein the tab 222 includes a first connecting segment 2221 and a second connecting segment 2222 connected in sequence, wherein the first connecting segment 2221 is connected to the body 221 of the electrode assembly 22 ;

[0219] S420, bending the second connecting section 2222 relative to the first connecting section 2221;

[0220] S430 , connecting at least one of the second connecting segment 2222 and the first connecting segment 2221 to the first portion 231 of the electrode lead-out member 23 .

[0221] The tab 222 is bent to form a first connecting segment 2221 and a second connecting segment 2222 , such that the second connecting segment 2222 is bent relative to the first connecting segment 2221 .

[0222] According to the manufacturing method 400 of the battery cell of an embodiment of the present application, the second connecting section 2222 is bent relative to the first connecting section 2221, which can reduce the risk of interference between the tab 222 and other components, facilitate the assembly of the battery cell 20, and improve the assembly efficiency; on the other hand, it can reduce the risk of short circuit between the positive and negative poles of the battery cell 20, and the battery cell 20 manufactured using this manufacturing method has higher reliability.

[0223] According to some embodiments of the present application, the multiple sub-electrode ears 2223 stacked in the electrode assembly 22 are gathered, including: connecting the multiple sub-electrode ears 2223 to form a first connecting portion 24; and bending the second connecting segment 2222 relative to the first connecting segment 2221, including: bending the electrode ear 222 at one end of the first connecting portion 24 away from the main body 221 to form a second connecting segment 2222.

[0224] In the above solution, multiple sub-pole tabs 2223 are connected to form a first connecting portion 24, so that the multiple sub-pole tabs 2223 have a compact structure, which facilitates the aggregation of electrical energy of the multiple sub-pole tabs 2223; the tab 222 is bent at one end of the first connecting portion 24 away from the main body 221 to facilitate bending the tab 222.

[0225] According to some embodiments of the present application, connecting at least one of the second connecting segment 2222 and the first connecting segment 2221 to the first portion 231 of the electrode lead-out member 23 includes: connecting the second connecting segment 2222, the first connecting portion 24 and the electrode lead-out member 23 to form a second connecting portion 25.

[0226] In the above solution, the second connecting section 2222, the first connecting portion 24 and the electrode lead-out member 23 are connected to form the second connecting portion 25, which can not only constrain the second connecting section 2222, but also enable the tab 222 and the electrode lead-out member 23 to have a higher current capacity.

[0227] According to some embodiments of the present application, referring to Figures 3 to 13, embodiments of the present application provide a battery cell 20, which includes a housing 21, an electrode assembly 22, an electrode terminal 26, and an electrode lead-out member 23. The housing 21 includes a shell 211 and a cover 212. The shell 211 has an opening, and the cover 212 closes the opening to form a storage space. The electrode assembly 22 is disposed in the storage space and has a laminated structure. The electrode assembly 22 includes a body 221 and a tab 222 extending from the body 221. The pole lug 222 includes a plurality of sub-pole lugs 2223 arranged in a stacked manner, and the plurality of sub-pole lugs 2223 are gathered and connected to form a first connecting portion 24. The pole lug 222 includes an overlapping area 2224 where the plurality of sub-pole lugs 2223 overlap with each other and a staggered area 2225 where the ends of the plurality of sub-pole lugs 2223 are staggered with each other. The staggered area 2225 is connected to the main body 221 through the overlapping area 2224. A portion of the first connecting portion 24 is located in the overlapping area 2224, and the other portion of the first connecting portion 24 is located in the staggered area 2225. The tab 222 includes a root segment 2227, a second bent segment 2228, a first connecting segment 2221, a first bent segment 2226, and a second connecting segment 2222, which are connected in sequence. The root segment 2227 is connected to the body 221. The first connecting segment 2221 is bent relative to the root segment 2227. The second connecting segment 2222 is bent relative to the first connecting segment 2221. The second connecting segment 2222 is located on the side of the first connecting segment 2221 facing away from the first portion 231. The second connecting segment 2222, the first connecting segment 2221, and the first portion 231 of the electrode lead 23 are connected to form the second connecting portion 25. The first portion 231 has a first surface 2311 facing the body 221. The projection of the second connecting portion 25 falls within the projection of the first connecting portion 24, perpendicular to the first surface 2311. The electrode terminal 26 is disposed on the cover 212. The electrode lead 23 connects the tab 222 and the electrode terminal 26.

[0228] According to the battery cell 20 of the embodiment of the present application, the second connecting section 2222 is bent relative to the first connecting section 2221, and the second connecting section 2222 is connected to the side of the first connecting section 2221 that is away from the first part 231, thereby reducing the risk of interference between the tab 222 and other components and reducing the risk of short circuit between the positive and negative poles of the battery cell 20, so that the battery cell 20 has higher safety.

[0229] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and components may be substituted with equivalents without departing from the scope of the present application. In particular, the various technical features described in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions within the scope of the claims.

Claims

1. A battery cell, comprising: An electrode assembly, including a body and tabs; an electrode lead-out member, for conducting electrical energy out of the electrode assembly, the electrode lead-out member comprising a first portion; The tab includes a first connecting segment and a second connecting segment connected in sequence, the first connecting segment is connected to the body, the second connecting segment is bent relative to the first connecting segment, and at least one of the first connecting segment and the second connecting segment is connected to the first part.

2. The battery cell according to claim 1, wherein: The first connecting section is connected to the first portion, and the second connecting section is located on a side of the first connecting section that is away from the first portion.

3. The battery cell according to claim 1 or 2, wherein: The second connecting section is bounded to a side of the first connecting section facing away from the first portion.

4. The battery cell according to claim 3, wherein: The second connecting section is connected to the first connecting section.

5. The battery cell according to any one of claims 1 to 4, wherein: The first connecting section and the second connecting section are both electrically connected to the first portion.

6. The battery cell according to any one of claims 1 to 5, wherein: The first connecting section and the second connecting section are stacked.

7. The battery cell according to any one of claims 1 to 6, wherein: The electrode tab includes a plurality of sub-tabs stacked together, the plurality of sub-tabs are connected to form a first connecting portion, and the first connecting portion is located in the first connecting section.

8. The battery cell according to claim 7, wherein: The electrode tab includes an overlapping area where the multiple sub-tabs overlap with each other and a staggered area where the ends of the multiple sub-tabs are staggered with each other. The staggered area is connected to the body through the overlapping area. A part of the first connecting portion is located in the overlapping area, and another part of the first connecting portion is located in the staggered area.

9. The battery cell according to claim 8, wherein: The first connecting portion includes a first end connected to the main body and a second end connected to the second connecting section. Along the direction from the first end to the second end, the size of the first connecting portion is L, and the size of the portion of the first connecting portion located in the staggered area is L1, satisfying 0.2L≤L1≤0.5L.

10. The battery cell according to any one of claims 7 to 9, wherein: The first portion has a first surface connected to the first connecting section; The second connecting section, the first connecting section and the electrode lead-out member are connected to form a second connecting portion. Along a direction perpendicular to the first surface, a projection of the second connecting portion at least partially overlaps with a projection of the first connecting portion.

11. The battery cell according to claim 10, wherein: Along a direction perpendicular to the first surface, a projection of the second connecting portion falls within a projection of the first connecting portion.

12. The battery cell according to claim 10 or 11, wherein: The first connecting portion includes a first end connected to the main body and a second end connected to the second connecting section. Along the direction from the first end to the second end, the size of the first connecting portion is L, the size of the portion of the first connecting portion located in the staggered area is L1, and the size of the second connecting portion is L3, satisfying L1<L3<L.

13. The battery cell according to any one of claims 10 to 12, wherein: The first connecting portion includes a first end connected to the body and a second end connected to the second connecting segment. Along the direction from the first end to the second end, the midpoint of the second connecting portion coincides with the midpoint of the first connecting portion.

14. The battery cell according to any one of claims 10 to 13, wherein: Along the direction from one end of the second connecting segment connected to the first connecting segment to the free end of the second connecting segment, the second connecting segment extends beyond the second connecting portion.

15. The battery cell according to any one of claims 10 to 14, wherein: Along a direction perpendicular to the first surface, a projection of the second connecting segment covers a projection of the first connecting portion.

16. The battery cell according to any one of claims 10 to 15, wherein: The first connection portion and / or the second connection portion are formed by ultrasonic welding.

17. The battery cell according to any one of claims 1 to 16, wherein: The battery cell further includes an electrode terminal, and the electrode lead-out member is a connecting member connecting the electrode tab and the electrode terminal, or the electrode lead-out member is the electrode terminal.

18. The battery cell according to any one of claims 1 to 17, wherein: The electrode assembly is a laminated structure.

19. The battery cell according to any one of claims 1 to 18, wherein: The tab includes a plurality of sub-tabs stacked together, and the sub-tabs have the same height.

20. The battery cell according to any one of claims 1 to 19, wherein: The tab extends from a first end surface of the body, the first end surface faces the first portion, and the tab further includes a root segment connecting the first connecting segment and the body, and the first connecting segment is bent relative to the root segment.

21. The battery cell according to any one of claims 2 to 20, wherein: The electrode assembly includes a first electrode assembly and a second electrode assembly, the first electrode assembly and the second electrode assembly are respectively provided with the electrode tab, the electrode tab of the first electrode assembly and the electrode tab of the second electrode assembly are connected to one electrode lead-out piece, and the second connecting section of the electrode tab of the first electrode assembly and the second connecting section of the electrode tab of the second electrode assembly extend in opposite directions.

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

23. An electrical device comprising the battery cell according to any one of claims 1 to 21 or the battery according to claim 22, wherein the battery cell or the battery is used to provide electrical energy.

24. A method for manufacturing a battery cell, comprising: Gathering a plurality of stacked sub-tabs of the electrode assembly to form a tab, wherein the tab includes a first connecting segment and a second connecting segment connected in sequence, wherein the first connecting segment is connected to the body of the electrode assembly; bending the second connecting section relative to the first connecting section; At least one of the second connecting segment and the first connecting segment is connected to the first portion of the electrode lead-out member.

25. The method for manufacturing a battery cell according to claim 24, wherein: The step of folding the plurality of stacked sub-electrode tabs of the electrode assembly comprises: connecting the plurality of sub-tabs to form a first connecting portion; Bending the second connecting segment relative to the first connecting segment comprises: The tab is bent at one end of the first connecting portion away from the body to form a second connecting segment.

26. The method for manufacturing a battery cell according to claim 25, wherein: The step of connecting at least one of the second connecting segment and the first connecting segment to the first portion of the electrode lead-out member includes: The second connecting section, the first connecting portion and the electrode lead-out member are connected to form a second connecting portion.

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