Battery cells, batteries and electrical equipment

Abstract

The embodiment of the present application provides a battery cell, a battery and an electrical device, wherein the battery cell includes an electrode assembly, a first electrode lead-out portion and a first current collecting member. The first electrode lead-out portion is used to input or output electrical energy of the battery cell. The first current collecting member is disposed between the electrode assembly and the first electrode lead-out portion along a first direction, and the first current collecting member includes a metal area and a non-metal area, the metal area electrically connects the electrode assembly and the first electrode lead-out portion, the non-metal area is connected to the metal area, and along the first direction, the metal area and the non-metal area both abut against the electrode assembly. The metal area and the non-metal area of ​​the first current collecting member both abut against the electrode assembly, which helps to stabilize the position of the electrode assembly and reduce the risk of the electrode assembly shaking or detaching from the first current collecting member. The non-metal area of ​​the first current collecting member may have a lower density than the metal area, which helps to reduce the weight of the first current collecting member, thereby reducing the weight of the battery cell and achieving lightweight battery cells.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to battery cells, batteries and electrical equipment. Background Art

[0002] With the development of new energy technology, batteries are used more and more widely, such as in mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes and electric tools, etc.

[0003] In the development of battery technology, in addition to maintaining the structural stability of battery cells, the cost of battery cells is also an issue that needs to be considered. Therefore, achieving cost reduction of battery cells is an issue that needs to be improved in battery technology. Utility Model Content

[0004] The battery cells, batteries and electrical equipment provided in the embodiments of the present application are used to reduce the cost of the battery cells.

[0005] In a first aspect, an embodiment of the present application provides a battery cell, comprising an electrode assembly, a first electrode lead-out portion and a first current collecting member; the first electrode lead-out portion is used to input or output electrical energy of the battery cell; the first current collecting member is arranged between the electrode assembly and the first electrode lead-out portion along a first direction, the first current collecting member comprises a metal area and a non-metal area, the metal area electrically connects the electrode assembly and the first electrode lead-out portion, the non-metal area is connected to the metal area, and along the first direction, the metal area and the non-metal area both abut against the electrode assembly.

[0006] In the above technical solution, the metal area and non-metal area of ​​the first current collecting member are both against the electrode assembly, reducing the risk of the electrode assembly shaking inside the battery cell and improving the structural stability of the battery cell. The non-metal area of ​​the first current collecting member can reduce the metal content of the first current collecting member, reduce the production cost of the current collecting member, and thus reduce the cost of the battery cell, which has better economy.

[0007] In some embodiments, the metal area includes a first portion and a first connecting portion, the non-metal area includes a second portion and a second connecting portion, the projection of the first portion along the first direction does not overlap with the projection of the second portion along the first direction, the first portion and the second portion are both against the electrode assembly, and the first connecting portion and the second connecting portion are plugged together to fix the metal area and the non-metal area. The first portion and the second portion can be connected by plugging together the first connecting portion and the second connecting portion, so that the position of the metal area and the non-metal area is relatively stable, which helps to maintain the structural stability inside the battery cell. The plugging and matching of the first connecting portion and the second connecting portion also helps to connect the first connecting portion and the second connecting portion together, reducing the difficulty of installing the first connecting portion and the second connecting portion.

[0008] In some embodiments, the second part has a hollow portion, the hollow portion passes through the second part along the first direction, the first part is located in the hollow portion, the second connection portion includes a first protrusion arranged on the wall of the hollow portion, the first connection portion has a side surface arranged opposite to the wall surface of the hollow portion, the first connection portion includes a first hole portion arranged on the side surface, and at least a portion of the first protrusion is inserted into the first hole portion. By arranging the first part in the hollow portion that passes through the second part along the first direction, the first part and the second part can be abutted against the electrode assembly together along the first direction. The first protrusion is inserted into the first hole portion, so that the connection between the metal area and the non-metal area can be achieved, which is convenient for the manufacture of the first current collecting member.

[0009] In some embodiments, the wall surface includes a first surface and a second surface, the first surface and the second surface are arranged at an acute angle, and the first surface and the second surface are both provided with a first protrusion. By providing the first protrusion on the first surface and the second surface, the first protrusion on the first surface and the first protrusion on the second surface cooperate with the first hole portion to achieve the connection between the metal area and the non-metal area. The first surface and the second surface are arranged at an acute angle, so that the first part can be arranged between the first surface and the second surface with a smaller size, which helps to promote the stable connection between the metal area and the non-metal area.

[0010] In some embodiments, the second connection portion includes a second protrusion protruding from the surface of the second portion along the first direction; the first connection portion includes a lap portion connected to the first portion, the lap portion and the second portion are stacked along the first direction, the lap portion is provided with a second hole portion, and at least a portion of the second protrusion is inserted into the second hole portion. By providing the second protrusion on the second portion and the second hole portion on the lap portion, the second protrusion and the second hole portion cooperate to achieve the connection between the first portion and the second portion, thereby achieving the connection between the metal area and the non-metal area, reducing the difficulty of assembling the metal area and the non-metal area.

[0011] In some embodiments, the metal region includes a first portion, the non-metal region includes a second portion, a projection of the first portion along a first direction does not overlap with a projection of the second portion along the first direction, the first portion and the second portion both abut against the electrode assembly, and the first portion and the second portion are spliced ​​into a disc structure. By splicing the first portion and the second portion into a disc structure and making the first portion and the second portion abut against the electrode assembly, the structural stability of the electrode assembly located in the battery cell can be improved.

[0012] In some embodiments, the area of ​​the projection of the first portion along the first direction is S 1 , the area of ​​the projection of the second part along the first direction is S 2 , 0.02≤S 1 / S 2 ≤10. In S 1 / S 2≥0.02, the metal area of ​​the first current collecting member can meet the current requirement between the electrode assembly and the first electrode lead-out portion, and maintain the current performance of the first current collecting member; 1 / S 2 When S is less than 10, the metal content of the first current collecting member can be reduced by providing a non-metallic area of ​​the first current collecting member, thereby reducing the cost of the first current collecting member and further reducing the cost of the battery cell. 1 / S 2 When ≤10, it is possible to maintain the current flow performance of the first current collecting member and reduce the cost of the battery cell.

[0013] In some embodiments, 0.2≤S 1 / S 2 ≤1. In S 1 / S 2 ≥0.2, the flow area between the electrode assembly and the first electrode lead-out portion can be further increased, and the flow performance of the first current collecting member can be improved; 1 / S 2 ≤1, the cost of the first current collecting member can be further reduced, thereby reducing the cost of the battery cell. 1 / S 2 When ≤1, it is possible to further balance the maintenance of the current flow performance of the first current collecting member and the reduction of the cost of the battery cell.

[0014] In some embodiments, the density of the non-metallic region is less than that of the metal region. The non-metallic region has a smaller density than that of the metal region, so that the non-metallic region has a smaller weight per unit volume than the metal region. The non-metallic region helps to reduce the weight of the first current collecting member and achieve lightweight battery cells.

[0015] In some embodiments, the electrode assembly has a first pole ear, the metal area electrically connects the first pole ear and the first electrode lead-out portion, and along the first direction, the metal area and the non-metal area both abut against the first pole ear. By providing the first pole ear connected to the metal area, when the metal area abuts against the electrode assembly along the first direction, the metal area can contact the first pole ear, thereby achieving electrical connection between the metal area and the electrode assembly, which helps to achieve overcurrent between the first electrode lead-out portion and the electrode assembly, and the non-metal area and the metal area both abut against the first pole ear, which helps to improve the stability of the electrode assembly inside the battery cell.

[0016] In some embodiments, along the first direction, the metal region has a first end face, the non-metal region has a second end face, the first end face and the second end face both abut against the first pole ear, and the first end face and the second end face are flush. By setting the first end face and the second end face flush, the metal region abuts against the first pole ear more stably, thereby improving the stability of the electrode assembly inside the battery cell.

[0017] In some embodiments, the electrode assembly is a winding structure, and along the radial direction of the electrode assembly, the maximum distance from the first electrode ear to the center line of the electrode assembly is L 1 , the maximum distance from the metal area to the center line of the electrode assembly is L 2 , 0.5≤L 2 / L 1 ≤1. In L 2 / L 1 ≥0.5, the overcurrent requirements of the electrode assembly and the first electrode lead-out portion can be met; at L 2 / L 1 ≤1, the metal material used in the metal area can be reduced, the cost of the first current collecting member can be reduced, and thus the cost of the battery cell can be reduced; therefore, when 0.5≤L 2 / L 1 When ≤1, the overcurrent requirements of the electrode assembly and the first electrode lead-out portion can be met, and the metal material used in the metal area can be reduced, thereby reducing the cost of the battery cell.

[0018] In some embodiments, 0.8≤L 2 / L 1 ≤1. In L 2 / L 1 ≥0.8, the flow area between the electrode assembly and the first electrode lead-out portion can be further increased; therefore, when 0.8≤L 2 / L 1 ≤1 can both further improve the current carrying capacity of the first current collecting member between the electrode assembly and the first electrode lead-out portion and reduce the cost of the battery cell.

[0019] In some embodiments, along the first direction, the thickness of the first current collecting member is T, 0.1≤T≤5. When T≥0.1, the first current collecting member can have a higher strength to connect the first electrode lead-out portion and the electrode assembly, and improve the abutment effect of the first current collecting member on the electrode assembly; when T≤5, the material used for the first current collecting member can be saved, the space occupied by the first current collecting member in the battery cell can be reduced, and the energy density of the battery cell can be improved. Therefore, when 0.1≤T≤5, it is possible to take into account both improving the strength of the first current collecting member and improving the energy density of the battery cell.

[0020] In some embodiments, 0.2≤T≤2. When ≥0.2, the strength of the first current collecting member can be further improved, and the abutment effect of the first current collecting member on the electrode assembly can be improved; when T≤2, the material used for the first current collecting member can be further saved, the space occupied by the first current collecting member in the battery cell can be reduced, and the energy density of the battery cell can be improved. Therefore, when 0.2≤T≤2, the strength of the first current collecting member can be further improved and the energy density of the battery cell can be further improved.

[0021] In some embodiments, the metal area and / or the non-metal area is provided with weight-reducing holes. By providing the weight-reducing holes in the metal area and / or the non-metal area, the weight of the first current collecting member can be reduced, thereby reducing the weight of the battery cell and achieving lightweight battery cells.

[0022] In some embodiments, the battery cell further includes a shell, the electrode assembly is accommodated in the shell, the shell includes a first wall portion, along the first direction, the first current collecting member is arranged between the electrode assembly and the first wall portion, the first wall portion is provided with a pressure relief mechanism, and the weight reduction hole is configured to guide the discharge on the side of the first current collecting member facing the electrode assembly to the pressure relief mechanism. By arranging the first current collecting member between the electrode assembly and the first wall portion, the first current collecting member abuts the electrode assembly, and the first current collecting member can improve the stability of the electrode assembly in the shell. By arranging the pressure relief mechanism on the first wall portion, and providing the weight reduction hole in the metal area and / or the non-metal area, the discharge on the side of the first current collecting member facing the electrode assembly can be guided to the pressure relief mechanism through the weight reduction hole, thereby achieving pressure relief of the battery cell and reducing the risk of fire or even explosion of the battery cell due to untimely pressure relief.

[0023] In some embodiments, the material of the metal region is one of aluminum, aluminum alloy, copper or copper alloy.

[0024] In some embodiments, the material of the non-metallic region is one of ceramic, polypropylene, polyphenylene sulfide or polycarbonate.

[0025] In some embodiments, the projection of the first electrode lead-out portion along the first direction at least partially overlaps with the projection of the metal area along the first direction. By at least partially overlapping the projection of the first electrode lead-out portion along the first direction with the projection of the metal area along the first direction, the first electrode lead-out portion and the metal area can be stacked in the first direction, so as to facilitate electrical connection between the first electrode lead-out portion and the metal area.

[0026] In some embodiments, the battery cell further includes a shell, the electrode assembly is disposed in the shell, the shell has a first wall along a first direction, and the first current collecting member is located between the electrode assembly and the first wall along the first direction; wherein the first electrode lead-out portion is the first wall.

[0027] In some embodiments, the battery cell further includes a shell, the electrode assembly is disposed in the shell, the shell has a first wall along a first direction, and the first current collecting member is located between the electrode assembly and the first wall along the first direction; wherein the first electrode lead-out portion is an electrode terminal disposed on the first wall.

[0028] In some embodiments, the first electrode lead portion is an electrode terminal disposed on the first wall portion, and the projection of the electrode terminal along the first direction is located in the metal area. The projection of the electrode terminal along the first direction is located in the metal area, which can improve the current carrying capacity of the metal area and increase the utilization rate of the metal area.

[0029] In a second aspect, an embodiment of the present application provides a battery, comprising a battery cell provided in any embodiment of the first aspect.

[0030] In a third aspect, an embodiment of the present application provides an electrical device, comprising a battery cell as provided in any embodiment of the first aspect or a battery as provided in any embodiment of the second aspect, wherein the battery cell is used to provide electrical energy to the electrical device. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. 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 related drawings can be obtained based on these drawings without paying creative work.

[0032] Figure 1 A schematic diagram of the structure of a vehicle provided in some embodiments of the present application;

[0033] Figure 2 An exploded view of a battery provided for some embodiments of the present application;

[0034] Figure 3 An exploded view of a battery cell provided for some embodiments of the present application;

[0035] Figure 4 An exploded view of a battery cell provided in some other embodiments of the present application;

[0036] Figure 5 An assembly diagram of an electrode assembly, a first electrode lead-out portion, and a first current collecting member provided in some embodiments of the present application;

[0037] Figure 6 An exploded view of a first current collecting member provided in some embodiments of the present application;

[0038] Figure 7 for Figure 6 A partial enlarged view of the middle A area;

[0039] Figure 8 A schematic structural diagram of a first current collecting component provided in some other embodiments of the present application;

[0040] Fig. 9 An exploded view of a first current collecting component provided for still other embodiments of the present application;

[0041] Fig.10 A schematic structural diagram of a first current collecting component provided in some further embodiments of the present application;

[0042] Fig.11 for Fig.10 BB section view in;

[0043] Fig.12 Assembly diagrams of metal regions and electrode assemblies provided for some embodiments of the present application;

[0044] Fig.13 An exploded view of a battery cell provided in some other embodiments of the present application;

[0045] Fig.14 An assembly diagram of a battery cell provided for some embodiments of the present application;

[0046] Fig.15 Assembly diagram of electrode terminals, metal areas, electrode assemblies and casings provided for some embodiments of the present application.

[0047] Icon: 1000-vehicle; 100-battery; 10-battery cell; 1-first current collecting member; 1a-current collecting member; 11-metal area; 111-first part; 112-first connecting part; 1121-side; 11211-first hole; 1122-lap edge; 11221-second hole; 113-center hole; 114-first end face; 115-third end face; 12-non-metal area; 121-second part; 1211-hollow part; 1212-wall surface; 12121-first surface; 12122-second surface; 12123-first curved surface; 122-second connecting part ;1221-first protrusion;1222-second protrusion;123-second end face;124-fourth end face;13-weight-reducing hole;2-electrode assembly;21-ear;211-first ear;22-main body;212-second ear;3-first electrode lead-out portion;31-electrode terminal;3a-second electrode lead-out portion;4-housing;41-first wall portion;42-housing;43-end cover;44-second wall portion;5-pressure relief mechanism;6-second current collecting member;20-box;201-first box portion;202-second box portion;200-controller;300-motor;X-first direction. DETAILED DESCRIPTION

[0048] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0049] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field of this application; 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 drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. 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 and secondary relationship.

[0050] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments.

[0051] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0052] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0053] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0054] The term "plurality" used in the present application refers to two or more (including two).

[0055] 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.

[0056] Battery cells include, but are not limited to, 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, and the like.

[0057] A battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of the battery cell, active ions (such as lithium ions) are embedded and removed between the positive electrode and the negative electrode. The separator is set between the positive electrode and the negative electrode to reduce the risk of short circuit between the positive and negative electrodes, while allowing active ions to pass through.

[0058] In some embodiments, the positive electrode may be a positive electrode sheet, and the positive electrode sheet 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.

[0059] 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 disposed on either or both of the two facing surfaces of the positive electrode current collector.

[0060] 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 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.).

[0061] As an example, the positive electrode active material may include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides, and their respective modified compounds. However, the present application is not limited to these materials, and other traditional materials that can be used as positive electrode active materials for batteries may also be used. These positive electrode active materials may be used alone or in combination of two or more. Examples of lithium-containing phosphates may include, but are not limited to, lithium iron phosphate (such as LiFePO 4 (also referred to as LFP), composite materials of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO 4), 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 LiCoO 2 ), lithium nickel oxide (such as LiNiO 2 ), lithium manganese oxide (such as LiMnO 2 、LiMn 2 O 4 ), 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 O 2 (also referred to as NCM333), LiNi 0.5 Co 0.2 Mn 0.3 O 2 (also referred to as NCM523), LiNi 0.5 Co 0.25 Mn 0.25 O 2 (also referred to as NCM211), LiNi 0.6 Co 0.2 Mn 0.2 O 2 (also referred to as NCM622), LiNi 0.8 Co 0.1 Mn 0.1 O 2 (also referred to as NCM811), lithium nickel cobalt aluminum oxide (such as LiNi 0.85 Co 0.15 Al 0.05 O 2 ) and at least one of its modified compounds.

[0062] In some embodiments, the positive electrode may be a foamed metal. The foamed metal may be a nickel foam, a copper foam, an aluminum foam, or a foamed alloy. When the foamed metal is used as the positive electrode, the positive electrode active material may not be provided on the surface of the foamed metal, but of course, the positive electrode active material may also be provided. As an example, a lithium source material, potassium metal or sodium metal may also be filled or / and deposited in the foamed metal, and the lithium source material is lithium metal and / or a lithium-rich material.

[0063] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0064] As an example, the negative electrode current collector may be a metal foil, a foamed metal or a composite current collector. For example, as the metal foil, aluminum or stainless steel, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium, etc., treated with silver surface, may be used. The foamed metal may be a nickel foam, a copper foam, an aluminum foam, an alloy foam, etc. The composite current collector may include a polymer material base and a metal layer. The composite current collector may be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0065] 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.

[0066] 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 disposed on either or both of the two facing surfaces of the negative electrode current collector.

[0067] As an example, the negative electrode active material may adopt the negative electrode active material for battery cells 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.

[0068] 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.

[0069] In some embodiments, the electrode assembly is a wound structure, wherein the positive electrode sheet and the negative electrode sheet are wound into a wound structure.

[0070] In some embodiments, the electrode assembly is a laminate structure.

[0071] As an example, a plurality of positive electrode sheets and a plurality of negative electrode sheets may be provided respectively, and the plurality of positive electrode sheets and the plurality of negative electrode sheets may be alternately stacked.

[0072] As an example, a plurality of positive electrode sheets may be provided, and the negative electrode sheet is folded to form a plurality of stacked folded segments, with a positive electrode sheet sandwiched between adjacent folded segments.

[0073] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form a plurality of stacked folded sections.

[0074] As an example, a plurality of separators may be provided, each of which is provided between any adjacent positive electrode sheets or negative electrode sheets.

[0075] As an example, the separator may be disposed continuously, and may be disposed between any adjacent positive electrode sheets or negative electrode sheets by folding or winding.

[0076] In some embodiments, the shape of the electrode assembly can be cylindrical, flat, or polygonal.

[0077] In some embodiments, the battery cells may be cylindrical battery cells, prismatic battery cells, soft-pack battery cells or battery cells of other shapes. Prismatic battery cells include square-shell battery cells, blade-shaped battery cells, and polygonal prismatic batteries. Polygonal prismatic batteries are, for example, hexagonal prismatic batteries.

[0078] 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.

[0079] 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.

[0080] 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 accommodated in the case.

[0081] 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.

[0082] In some embodiments, the battery may be an energy storage device, which includes an energy storage container, an energy storage cabinet, and the like.

[0083] In battery technology, a battery cell includes an electrode lead-out portion, an electrode assembly, and a current collecting member, which is used to electrically connect the electrode lead-out portion and the electrode assembly. In a battery cell, the current collecting member needs to meet certain size requirements to support between the electrode assembly and the electrode lead-out portion, thereby abutting against the electrode assembly and improving the stability of the electrode assembly in the battery cell. In order to meet the electrical conductivity requirements between the electrode assembly and the electrode lead-out portion, the current collecting member is usually made of metal. However, in order to maintain the size requirements of the current collecting member, the current collecting member made of all metal has a high cost, which increases the manufacturing cost of the battery cell.

[0084] In view of this, in order to reduce the manufacturing cost of a battery cell, an embodiment of the present application provides a battery cell, including an electrode assembly, an electrode lead-out portion, and a current collecting member. The electrode lead-out portion is used to input or output electrical energy of the battery cell. The current collecting member is disposed between the electrode assembly and the electrode lead-out portion along a first direction, and the current collecting member includes a metal area and a non-metal area, the metal area electrically connects the electrode assembly and the electrode lead-out portion, the non-metal area is connected to the metal area, and along the first direction, the metal area and the non-metal area both abut against the electrode assembly.

[0085] By providing a metal area and a non-metal area between the electrode assembly and the electrode lead-out portion, the metal area can meet the current requirements of the electrode assembly and the electrode lead-out portion, so as to facilitate the normal use of the battery cell. The non-metal area can reduce the amount of metal used in the current collecting component, thereby reducing the manufacturing cost of the current collecting component and further reducing the cost of the battery cell.

[0086] The technical solutions described in the embodiments of the present application are applicable to batteries and electrical equipment using batteries.

[0087] Electrical equipment can be vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys and electric tools, etc. Vehicles can be fuel vehicles, gas vehicles or new energy vehicles. New energy vehicles can be pure electric vehicles, hybrid vehicles or extended-range vehicles, etc. Spacecraft include airplanes, rockets, space shuttles and spacecrafts, etc. Electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys and electric airplane toys, etc. Electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators and electric planers, etc.

[0088] For the convenience of description, the following embodiments are described by taking the electric device as a vehicle as an example.

[0089] Please refer to Figure 1 , Figure 1 The schematic diagram of the structure of the vehicle 1000 provided in some embodiments of the present application. The vehicle 1000 is provided with a battery 100 inside, 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 of the vehicle 1000.

[0090] The vehicle 1000 may further include a controller 200 and a motor 300 , wherein 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 starting, navigating, and driving the vehicle 1000 .

[0091] In some embodiments of the present application, the battery 100 can not only serve as an operating power source for the vehicle 1000, but also serve 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.

[0092] Please refer to Figure 2 , Figure 2 This is an exploded view of a battery 100 provided in some embodiments of the present application. The battery 100 includes a case 20 and a battery cell 10 . The case 20 is used to accommodate the battery cell 10 .

[0093] Among them, the box body 20 is a component for accommodating the battery cell 10. The box body 20 provides a storage space for the battery cell 10. The box body 20 can adopt a variety of structures. In some embodiments, the box body 20 may include a first box body portion 201 and a second box body portion 202. The first box body portion 201 and the second box body portion 202 cover each other to define a storage space for accommodating the battery cell 10. The first box body portion 201 and the second box body portion 202 can be in a variety of shapes, such as a cuboid, a cylinder, etc. The first box body portion 201 can be a hollow structure with one side open, and the second box body portion 202 can also be a hollow structure with one side open. The open side of the second box body portion 202 covers the open side of the first box body portion 201, thereby forming a box body 20 with a storage space. Alternatively, the first box body 201 may be a hollow structure with one side open, and the second box body 202 may be a plate-like structure, and the second box body 202 may cover the open side of the first box body 201, thereby forming a box body 20 with a receiving space. The first box body 201 and the second box body 202 may be sealed by a sealing element, which may be a sealing ring, a sealant, or the like.

[0094] In the battery 100, there can be one or more battery cells 10. If there are more than one battery cell 10, the multiple battery cells 10 can be connected in series, in parallel, or in mixed connection. Mixed connection means that the multiple battery cells 10 are both connected in series and in parallel. Multiple battery cells 10 can be connected in series, in parallel, or in mixed connection to form a battery 100 module, and the multiple battery 100 modules can be connected in series, in parallel, or in mixed connection to form a whole, and accommodated in the box 20. It is also possible that all battery cells 10 are directly connected in series, in parallel, or in mixed connection, and then the whole formed by all battery cells 10 is accommodated in the box 20.

[0095] In some embodiments, the battery 100 may further include a busbar, through which multiple battery cells 10 may be electrically connected to achieve series connection, parallel connection, or hybrid connection of multiple battery cells 10. The busbar may be a metal conductor, such as copper, iron, aluminum, stainless steel, aluminum alloy, etc.

[0096] Please refer to Figure 3 , Figure 3An exploded view of a battery cell 10 provided in some embodiments of the present application. The battery cell 10 includes a housing 4 and an electrode assembly 2.

[0097] The housing 4 may include a shell 42 and an end cover 43 . The shell 42 has an opening, and the end cover 43 seals the opening of the shell 42 .

[0098] The shell 42 is a component for accommodating the electrode assembly 2. The shell 42 may be a hollow structure with an opening at one end, or a hollow structure with openings at opposite ends. The shell 42 may be in various shapes, such as a cylindrical shape, a rectangular parallelepiped shape, etc. The shell 42 may be made of various materials, such as copper, iron, aluminum, steel, aluminum alloy, etc.

[0099] The end cap 43 is a component that seals the opening of the shell 42 to isolate the internal environment of the battery cell 10 from the external environment. The end cap 43 and the shell 42 together define a receiving space for accommodating the electrode assembly 2, the electrolyte and other components. The end cap 43 can be connected to the shell 42 by welding or crimping to close the opening of the shell 42. The shape of the end cap 43 can be adapted to the shape of the shell 42. For example, the shell 42 is a rectangular structure, and the end cap 43 is a rectangular plate-like structure adapted to the outer shell 4. For another example, the shell 42 is cylindrical, and the end cap 43 is a circular plate-like structure adapted to the shell 42. The material of the end cap 43 can also be a variety of materials, such as copper, iron, aluminum, steel, aluminum alloy, plastic, etc. The material of the end cap 43 and the shell 42 can be the same or different.

[0100] In the embodiment where the housing 42 is opened at one end, one end cap 43 may be provided. In the embodiment where the housing 42 is opened at two opposite ends, two end caps 43 may be provided, the two end caps 43 respectively close the two openings of the housing 42, and the two end caps 43 and the housing 42 together define a receiving space.

[0101] The electrode assembly 2 includes a main body 22 and a pole ear 21 . The pole ears 21 are disposed at both ends of the main body 22 . The pole ears 21 at both ends of the main body 22 are respectively a positive pole ear and a negative pole ear.

[0102] The battery cell 10 may further include an electrode terminal 31, which is disposed on the outer shell 4. The electrode terminal 31 is used to electrically connect to the tab 21 of the electrode assembly 2 to input or output the electrical energy of the battery cell 10. The electrode terminal 31 may be electrically connected to the positive tab of the electrode assembly 2, or the electrode terminal 31 may be electrically connected to the negative tab of the electrode assembly 2. The electrode terminal 31 may be disposed on the shell 42 of the outer shell 4, or on the end cover 43 of the outer shell 4. The electrode terminal 31 and the tab 21 may be directly connected, for example, the electrode terminal 31 and the tab 21 are welded. The electrode terminal 31 and the tab 21 may also be indirectly connected, for example, the electrode terminal 31 and the tab 21 are indirectly connected through the current collecting member 1a. The current collecting member 1a may be a metal conductor, for example, copper, iron, aluminum, steel, aluminum alloy, etc.

[0103] As an example, Figure 3 As shown, one end of the shell 42 forms an opening, and the end cap 43 closes the opening of the shell 42. The end cap 43 is provided with an electrode terminal 31, the electrode assembly 2 is provided in the shell 42, the current collecting component 1a is electrically connected to the electrode terminal 31 and the electrode tab 21 of the electrode assembly 2, and the current collecting component 1a is located between the electrode terminal 31 and the electrode assembly 2.

[0104] Please refer to Figure 4-Figure 5 , Figure 4 An exploded view of a battery cell 10 provided in some other embodiments of the present application; Figure 5 Assembly diagram of an electrode assembly 2, a first electrode lead-out portion 3, and a first current collecting member 1 provided for some embodiments of the present application. A battery cell 10 includes an electrode assembly 2, a first electrode lead-out portion 3, and a first current collecting member 1. The first electrode lead-out portion 3 is used to input or output electrical energy of the battery cell 10. The first current collecting member 1 is disposed between the electrode assembly 2 and the first electrode lead-out portion 3 along a first direction X, and the first current collecting member 1 includes a metal area 11 and a non-metal area 12, the metal area 11 electrically connects the electrode assembly 2 and the first electrode lead-out portion 3, and the non-metal area 12 is connected to the metal area 11, and along the first direction X, the metal area 11 and the non-metal area 12 are both against the electrode assembly 2.

[0105] The first electrode lead-out portion 3 may be a positive electrode lead-out portion electrically connected to the tab 21 of the electrode assembly 2 through the first current collecting member 1, or may be a negative electrode lead-out portion electrically connected to the tab 21 of the electrode assembly 2 through the first current collecting member 1. The battery cell 10 may further include a second electrode lead-out portion 3a, the second electrode lead-out portion 3a having a polarity opposite to that of the first electrode lead-out portion 3, one of the first electrode lead-out portion 3 and the second electrode lead-out portion 3a being electrically connected to the positive tab of the electrode assembly 2, and the other being electrically connected to the negative tab.

[0106] In the embodiment where the housing 42 is formed with an opening at one end, the electrode terminal 31 may be disposed on the end cap 43, and the electrode terminal 31 may serve as one of the first electrode lead-out portion 3 and the second electrode lead-out portion 3a, and the wall of the housing 42 opposite to the end cap 43 may serve as the other of the first electrode lead-out portion 3 and the second electrode lead-out portion 3a. In the embodiment where the housing 42 is formed with openings at opposite ends, the two end caps 43 respectively block the two openings, and one electrode terminal 31 may be disposed on one of the two end caps 43, and the electrode terminal 31 may serve as one of the first electrode lead-out portion 3 and the second electrode lead-out portion 3a, and the other of the two end caps 43 may serve as the other of the first electrode lead-out portion 3 and the second electrode lead-out portion 3a.

[0107] The first current collecting member 1 may be a disc structure or a rectangular plate structure, a part of the first current collecting member 1 is a metal area 11, and the other part is a non-metal area 12. If the first current collecting member 1 is a disc structure, the metal area 11 and the non-metal area 12 are spliced ​​into a circle; if the first current collecting member 1 is a rectangular plate structure, the metal area 11 and the non-metal area 12 are spliced ​​into a rectangle. The metal area 11 is the part of the first current collecting member 1 made of metal, and the material of the metal area 11 may be one of copper, iron, aluminum, aluminum alloy or copper alloy. The non-metal area 12 is the part of the first current collecting member 1 made of non-metal, and the non-metal material may be one of ceramic, polypropylene, polyphenylene sulfide or polycarbonate. The metal area 11 may be electrically connected to the first electrode lead-out portion 3 and the pole ear 21 of the electrode assembly 2, and the pole ear 21 may be a positive pole ear or a negative pole ear. The metal area 11 and the pole ear 21 of the electrode assembly 2 may be welded and connected, and the metal area 11 and the first electrode lead-out portion 3 may be welded and connected. The metal area 11 and the non-metal area 12 can be arranged in a flat manner between the electrode assembly 2 and the first electrode lead-out portion 3. The metal area 11 and the non-metal area 12 can be connected by bonding, clamping, plugging, etc.; the non-metal area 12 can also be connected to the metal area 11 by injection molding, and the non-metal area 12 is an injection molded part.

[0108] The first direction X is the arrangement direction of the electrode assembly 2 and the first electrode lead-out portion 3. In the embodiment where the electrode assembly 2 is a winding structure, the first direction X may be parallel to the extension direction of the winding axis of the electrode assembly 2. In the embodiment where the battery cell 10 is a cylindrical battery cell 10, the first direction X may be parallel to the axial direction of the battery cell 10.

[0109] The metal area 11 and the non-metal area 12 are both against the electrode assembly 2, so that the metal area 11 and the non-metal area 12 are in direct contact with the electrode assembly 2. The metal area 11 and the non-metal area 12 may both be against the pole ear 21 of the electrode assembly 2, or the metal area 11 may be against the pole ear 21 of the electrode assembly 2, and the non-metal area 12 may be against the main body 22 of the electrode assembly 2. The surface of the metal area 11 abutting against the electrode assembly 2 may be flush with the surface of the non-metal area 12 abutting against the electrode assembly 2; or the surface of the metal area 11 abutting against the electrode assembly 2 and the surface of the non-metal area 12 abutting against the electrode assembly 2 may not be in the same plane.

[0110] In the embodiment of the present application, the metal area 11 and the non-metal area 12 of the first current collecting member 1 are both against the electrode assembly 2, reducing the risk of the electrode assembly 2 shaking inside the battery cell 10 and improving the structural stability of the battery cell 10. The non-metal area 12 of the first current collecting member 1 can reduce the metal content of the first current collecting member 1, reduce the production cost of the first current collecting member 1, and thus reduce the cost of the battery cell 10, which has better economy.

[0111] In some embodiments, please refer to Figure 6 and Figure 7 , Figure 6 An exploded view of a first current collecting member 1 provided in some embodiments of the present application; Figure 7 for Figure 6 A partial enlarged view of the area A in the middle. The metal area 11 includes a first portion 111 and a first connecting portion 112, and the non-metal area 12 includes a second portion 121 and a second connecting portion 122. The projection of the first portion 111 along the first direction X does not overlap with the projection of the second portion 121 along the first direction X. The first portion 111 and the second portion 121 are both against the electrode assembly 2, and the first connecting portion 112 and the second connecting portion 122 are plugged together to fix the metal area 11 and the non-metal area 12.

[0112] The first portion 111 and the second portion 121 may be spaced apart so that the projection of the first portion 111 along the first direction X and the projection of the second portion 121 along the first direction X do not overlap. The first portion 111 and the second portion 121 may also be in contact with each other so that the projection of the first portion 111 along the first direction X and the projection of the second portion 121 along the first direction X do not overlap, wherein the contact area between the first portion 111 and the second portion 121 should also be regarded as a non-overlapping area.

[0113] One of the first connection portion 112 and the second connection portion 122 may have a plug-in portion, and the other may have a hole portion, and the plug-in portion cooperates with the hole portion to achieve plug-in cooperation between the first connection portion 112 and the second connection portion 122 .

[0114] The first part 111 and the second part 121 can be connected by plugging and matching the first connection part 112 and the second connection part 122, so that the positions of the metal area 11 and the non-metal area 12 are relatively stable, which helps to maintain the structural stability inside the battery cell 10. The plugging and matching of the first connection part 112 and the second connection part 122 helps to connect the first connection part 112 and the second connection part 122 together, which facilitates the installation of the first connection part 112 and the second connection part 122.

[0115] In some embodiments, please refer to Figure 6 and Figure 7 The second portion 121 has a hollow portion 1211, the hollow portion 1211 penetrates the second portion 121 along the first direction X, the first portion 111 is located in the hollow portion 1211, the second connecting portion 122 includes a first protrusion 1221 provided on the wall surface 1212 of the hollow portion 1211, the first connecting portion 112 has a side surface 1121 provided opposite to the wall surface 1212 of the hollow portion 1211, the first connecting portion 112 includes a first hole portion 11211 provided on the side surface 1121, and at least a portion of the first protrusion 1221 is inserted into the first hole portion 11211.

[0116] The hollow portion 1211 may be a gap in the second portion 121. For example, the second portion 121 is fan-shaped, and the second portion 121 may be filled into a complete disk, and the area where the filled part is located is the area where the hollow portion 1211 is located. The first portion 111 may fill the entire hollow portion 1211, or the first portion 111 may fill only a portion of the hollow portion 1211.

[0117] The wall 1212 and the side surface 1121 may both be planes; or both are curved surfaces; or the wall 1212 may include multiple surfaces, a portion of which are curved surfaces and another portion are planes, and the wall 1212 and the side surface 1121 are arranged correspondingly.

[0118] The first protrusion 1221 may extend in a direction perpendicular to the wall surface 1212 of the hollow portion 1211; or the extending direction of the first protrusion 1221 may form an acute angle or an obtuse angle with the direction perpendicular to the wall surface 1212 of the hollow portion 1211. When there are multiple first protrusions 1221, the extending direction of each first protrusion 1221 may extend in a direction perpendicular to the wall surface 1212 of the hollow portion 1211; or the extending direction of the first protrusion 1221 may form an acute angle or an obtuse angle with the direction perpendicular to the wall surface 1212 of the hollow portion 1211. The extending directions of the first protrusions 1221 may be the same or different.

[0119] The first protrusions 1221 may correspond to the first holes 11211 one by one, or a plurality of first protrusions 1221 may be inserted into the same first hole 11211 .

[0120] Only a portion of the first protrusion 1221 may be inserted into the first hole 11211 , or the entire first protrusion 1221 may be inserted into the first hole 11211 .

[0121] By disposing the first portion 111 in the hollow portion 1211 that penetrates the second portion 121 along the first direction X, the first portion 111 and the second portion 121 can be pressed against the electrode assembly 2 along the first direction X. The first protrusion 1221 is inserted into the first hole 11211 to achieve connection between the metal area 11 and the non-metal area 12, thereby facilitating the manufacture of the first current collecting member 1.

[0122] In other embodiments, the first part 111 has a second hollow portion, the second hollow portion passes through the first part 111 along the first direction X, the second part 121 is located in the second hollow portion, the second connecting portion 122 includes a third protrusion arranged on the second wall 1212 of the second hollow portion, the first connecting portion 112 has a second side surface 1121 arranged opposite to the second wall surface 1212 of the second hollow portion, the first connecting portion 112 includes a third hole portion arranged on the second side surface 1121, and at least a portion of the third protrusion is inserted in the third hole portion.

[0123] In some embodiments, please refer to Figure 6 and Figure 7 The wall surface 1212 includes a first surface 12121 and a second surface 12122 . The first surface 12121 and the second surface 12122 are arranged at an acute angle. The first surface 12121 and the second surface 12122 are both provided with a first protrusion 1221 .

[0124] As an example, Figure 6 and Figure 7 As shown, the wall surface 1212 includes a first surface 12121, a second surface 12122 and a first curved surface 12123. The first curved surface 12123 connects the first surface 12121 and the second surface 12122. The first surface 12121, the second surface 12122 and the first curved surface 12123 are all provided with a first protrusion 1221. The side wall is provided with a first hole portion 11211, and the first protrusion 1221 corresponds to the first hole portion 11211 one by one.

[0125] By providing the first protrusion 1221 on the first surface 12121 and the second surface 12122, the first protrusion 1221 of the first surface 12121 and the first protrusion 1221 of the second surface 12122 cooperate with the first hole 11211 to achieve the connection between the metal area 11 and the non-metal area 12. The first surface 12121 and the second surface 12122 are arranged at an acute angle, so that the first portion 111 can be arranged between the first surface 12121 and the second surface 12122 with a smaller size, which helps to promote the stable connection between the metal area 11 and the non-metal area 12.

[0126] In some embodiments, please refer to Figure 8 and Fig. 9 , Figure 8 A schematic structural diagram of a first current collecting component 1 provided in some other embodiments of the present application; Fig. 9 Exploded view of the first current collecting member 1 provided for some other embodiments of the present application. The second connection portion 122 includes a second protrusion 1222 protruding from the surface of the second portion 121 along the first direction X. The first connection portion 112 includes a lap portion 1122 connected to the first portion 111, and the lap portion 1122 is stacked with the second portion 121 along the first direction X. The lap portion 1122 is provided with a second hole portion 11221, and at least a portion of the second protrusion 1222 is inserted into the second hole portion 11221.

[0127] Along the first direction X, the first portion 111 has a third end face 115 away from the electrode assembly 2, and the second portion 121 has a fourth end face 124 away from the electrode assembly 2. The second protrusion 1222 may protrude from the fourth end face 124; or the fourth end face 124 may be provided with a sink, the sink has a bottom wall away from the electrode assembly 2, and the second protrusion 1222 protrudes from the bottom wall of the sink.

[0128] The second protrusion 1222 may protrude from the second portion 121 along the first direction X; or the projection of the second protrusion 1222 along a direction perpendicular to the first direction X may be located within the projection of the second portion 121 along a direction perpendicular to the first direction X.

[0129] The entire second protrusion 1222 may be inserted into the second hole 11221 ; or only a portion of the second protrusion 1222 may be inserted into the second hole 11221 .

[0130] The number of the second protrusions 1222 may be one or more. When the number of the second protrusions 1222 is more than one, the second protrusions 1222 correspond to the second holes 11221 one by one.

[0131] As an example, Figure 8 and Fig. 9As shown, a plurality of second protrusions 1222 are provided, the number of the overlapping portions 1122 is two, and a plurality of second hole portions 11221 are provided on the two overlapping portions 1122 , and the second protrusions 1222 correspond to the second hole portions 11221 one by one.

[0132] In the embodiment where the second connection portion 122 includes the first protrusion 1221 and the first connection portion 112 includes the first hole portion 11211 , the second connection portion 122 may further include the second protrusion 1222 , and the first connection portion 112 may further include the second hole portion 11221 .

[0133] By providing a second protrusion 1222 on the second portion 121 and providing a second hole portion 11221 on the overlapping portion 1122, the second protrusion 1222 and the second hole portion 11221 cooperate to achieve the connection between the first portion 111 and the second portion 121, thereby achieving the connection between the metal area 11 and the non-metal area 12, thereby reducing the difficulty of assembling the metal area 11 and the non-metal area 12.

[0134] In other embodiments, the first portion 111 has a fourth surface along the first direction X, and the second connection portion 122 includes a fourth protrusion disposed on the fourth surface. The first connection portion 112 includes a second overlap portion 1122 connected to the second portion 121, and along the first direction X, the second overlap portion 1122 is stacked with the first portion 111, and the second overlap portion 1122 is provided with a fourth hole portion, and at least a portion of the fourth protrusion is inserted into the fourth hole portion.

[0135] In some embodiments, please refer to Figure 8 and Fig. 9 The metal region 11 includes a first portion 111, and the non-metal region 12 includes a second portion 121. The projection of the first portion 111 along the first direction X does not overlap with the projection of the second portion 121 along the first direction X. The first portion 111 and the second portion 121 are both against the electrode assembly 2, and the first portion 111 and the second portion 121 are spliced ​​into a disc structure.

[0136] When the first portion 111 contacts the second portion 121 , the contact area of ​​the first portion 111 and the second portion 121 should also be considered as non-overlapping.

[0137] By splicing the first portion 111 and the second portion 121 into a disc structure and making the first portion 111 and the second portion 121 abut against the electrode assembly 2 , the structural stability of the electrode assembly 2 in the battery cell 10 can be improved.

[0138] In some embodiments, the projection area of ​​the first portion 111 along the first direction X is S 1 , the projection area of ​​the second portion 121 along the first direction X is S 2 , 0.02≤S1 / S 2 ≤10.

[0139] The first portion 111 and the second portion 121 may be directly connected to realize the connection between the metal area 11 and the non-metal area 12 ; or the first portion 111 and the second portion 121 may be indirectly connected to realize the connection between the metal area 11 and the non-metal area 12 .

[0140] The projection area of ​​the first current collecting member 1 along the first direction X is S 3 , satisfying S 1 +S 2 =S 3 .

[0141] Taking the battery cell 10 as a cylindrical battery cell 10 as an example, the first current collecting member 1 is in a disc shape. The projection of the first part 111 along the first direction X and the projection of the second part 121 along the first direction X may cover the projection of the entire first current collecting member 1 along the first direction X; or the projection of the first part 111 along the first direction X and the projection of the second part 121 along the first direction X may cover and be located within the projection of the first current collecting member 1 along the first direction X.

[0142] S 1 / S 2 It can be any point value of 0.02, 0.03, 0.04, 0.05, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1, 1.5, 2, 2.5, 3, 4, 5, 6, 7, 8, 9, 10 or a range of values ​​between any two of them.

[0143] In S 1 / S 2 ≥0.02, the metal region 11 of the first current collecting member 1 can meet the current requirement between the electrode assembly 2 and the first electrode lead-out portion 3, and maintain the current performance of the first current collecting member 1; 1 / S 2 ≤10, the weight of the first current collecting member 1 can be reduced by providing the non-metallic region 12 of the first current collecting member 1, thereby reducing the weight of the battery cell 10. 1 / S 2 When ≦10, it is possible to maintain the current flow performance of the first current collecting member 1 and reduce the weight of the battery cell 10 , thereby achieving lightweighting of the battery cell 10 .

[0144] In some embodiments, 0.2≤S 1 / S 2 ≤1.

[0145] S 1 / S 2It can be any point value of 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95, 1, or a range of values ​​between any two of them.

[0146] In S 1 / S 2 ≥0.2, the flow area between the electrode assembly 2 and the first electrode lead-out portion 3 can be further increased, and the flow performance of the first current collecting member 1 can be improved; 1 / S 2 ≤1, the weight of the first current collecting member 1 can be further reduced, thereby reducing the weight of the battery cell 10. 1 / S 2 When ≦1, it is possible to further balance the maintenance of the current flow performance of the first current collecting member 1 and the reduction of the weight of the battery cell 10 , thereby achieving a lighter battery cell 10 .

[0147] In some embodiments, the density of the non-metal region 12 is less than the density of the metal region 11 .

[0148] The material of the metal area 11 may be one of aluminum, iron, aluminum alloy, copper or copper alloy, and the material of the non-metal area 12 may be one of ceramic, polypropylene, polyphenylene sulfide or polycarbonate. The density of the non-metal area 12 is less than that of the metal area 11.

[0149] The density of the non-metal is lower than that of the metal area 11 , so that the non-metal area 12 has a smaller weight per unit volume than the metal area 11 . The provision of the non-metal area 12 helps to reduce the weight of the first current collecting member 1 and achieve lightweight battery cell 10 .

[0150] In some embodiments, please refer to Fig.10 and Fig.11 , Fig.10 A schematic structural diagram of a first current collecting component 1 provided in some further embodiments of the present application; Fig.11 for Fig.10 The electrode assembly 2 has a first electrode tab 211 ( Figure 5 As shown in FIG. 1 , the metal region 11 is electrically connected to the first electrode tab 211 and the first electrode lead-out portion 3 . Along the first direction X, the metal region 11 and the non-metal region 12 are both against the first electrode tab 211 .

[0151] Only a portion of the metal region 11 may be in contact with the first electrode tab 211 ; or the entire metal region 11 may be in contact with the first electrode tab 211 .

[0152] By setting the first pole ear 211 to connect the metal area 11, when the metal area 11 abuts against the electrode assembly 2 along the first direction X, the metal area 11 can contact the first pole ear 211, thereby realizing electrical connection between the metal area 11 and the electrode assembly 2, which helps to achieve flow between the first electrode lead-out portion 3 and the electrode assembly 2. The non-metallic area 12 and the metal area 11 both abut against the first pole ear 211, which helps to improve the stability of the electrode assembly 2 inside the battery cell 10.

[0153] In some embodiments, please refer to Fig.10 and Fig.11 Along the first direction X, the metal region 11 has a first end surface 114 , and the non-metal region 12 has a second end surface 123 . The first end surface 114 and the second end surface 123 are both against the first electrode tab 211 , and the first end surface 114 and the second end surface 123 are flush.

[0154] As an example, Fig.10 and Fig.11 As shown, along the first direction X, the metal zone 11 has a first end face 114 and a third end face 115 relative to each other, and the first end face 114 is closer to the electrode assembly 2 than the third end face 115, and the non-metal zone 12 has a second end face 123 and a fourth end face 124 relative to each other, and the second end face 123 is closer to the electrode assembly 2 than the fourth end face 124, the first end face 114 is flush with the second end face 123, and the third end face 115 is flush with the fourth end face 124, and both the first end face 114 and the second end face 123 can abut against the first pole ear 211.

[0155] By arranging the first end surface 114 and the second end surface 123 to be flush, the metal region 11 and the non-metal region 12 can be more stably abutted against the first electrode tab 211 , thereby improving the stability of the electrode assembly 2 inside the battery cell 10 .

[0156] In some embodiments, please refer to Fig.12 , Fig.12 The assembly diagram of the metal area 11 and the electrode assembly 2 provided in some embodiments of the present application. The electrode assembly 2 is a winding structure. Along the radial direction of the electrode assembly 2, the maximum distance from the first electrode tab 211 to the center line of the electrode assembly 2 is L 1 The maximum distance from the metal area 11 to the center line of the electrode assembly 2 is L 2 , 0.5≤L 2 / L 1 ≤1.

[0157] It can be understood that when the electrode assembly 2 has a center line, the battery cell 10 is a cylindrical battery cell 10 .

[0158] The center line of the electrode assembly 2 is located within the projection of the radial edge of the first electrode tab 211 ; the center line of the electrode assembly 2 is located within the projection of the radial edge of the metal region 11 .

[0159] L 2 / L 1 It can be any point value of 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95, 1, or a range value between any two of them.

[0160] When the battery cell 10 is a cylindrical battery cell 10, its electrode assembly 2 can be approximately regarded as a cylinder, and the first pole ear 211 of the electrode assembly 2 can be arranged on the two circular surfaces of the cylinder. The first pole ear 211 can extend from the center line of the cylinder to the circumferential surface of the cylinder, and its bottom radius is the maximum distance from the first pole ear 211 to the center line of the electrode assembly 2.

[0161] In L 2 / L 1 ≥0.5, the overcurrent requirements of the electrode assembly 2 and the first electrode lead-out portion 3 can be met; 2 / L 1 ≤1, the metal material of the metal area 11 can be reduced, and the weight of the first current collecting member 1 can be reduced; therefore, when 0.5≤L 2 / L 1 When ≤1, the current requirements of the electrode assembly 2 and the first electrode lead-out portion 3 can be met, and the metal material of the metal area 11 can be reduced, the weight of the first current collecting member 1 can be reduced, and the battery cell 10 can be lightweight.

[0162] In some embodiments, 0.8≤L 2 / L 1 ≤1.

[0163] L 2 / L 1 It can be any point value of 0.8, 0.81, 0.82, 0.83, 0.84, 0.85, 0.86, 0.87, 0.88, 0.89, 0.9, 0.91, 0.92, 0.93, 0.94, 0.95, 0.96, 0.97, 0.98, 0.99, 1, or a range value between any two of them.

[0164] As an example, Fig.12 As shown, a central hole 113 is formed on the metal area 11 , and the neutral line of the electrode assembly 2 passes through the center of the central hole 113 , which helps to install and position the first current collecting member 1 . A portion of the metal area 11 overlaps a portion of the first electrode tab 211 .

[0165] In L2 / L 1 ≥0.8, the flow area between the electrode assembly 2 and the first electrode lead-out portion 3 can be further increased; therefore, when 0.8≤L 2 / L 1 ≤1 can both further improve the current carrying capacity of the first current collecting member 1 between the electrode assembly 2 and the first electrode lead-out portion 3 and reduce the weight of the first current collecting member 1 to achieve lightweighting of the battery cell 10 .

[0166] In some embodiments, along the first direction X, the thickness of the first current collecting member 1 is T, and 0.1≤T≤5.

[0167] T can be any one of 0.1, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95, 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5, or a range between any two of them.

[0168] When T≥0.1, the first current collecting member 1 can have a relatively high strength to connect the first electrode lead-out portion 3 and the electrode assembly 2, and improve the abutment effect of the first current collecting member 1 on the electrode assembly 2; when T≤5, the material used for the first current collecting member 1 can be saved, the space occupied by the first current collecting member 1 in the battery cell 10 can be reduced, and the energy density of the battery cell 10 can be improved. Therefore, when 0.1≤T≤5, it is possible to take into account both improving the strength of the first current collecting member 1 and improving the energy density of the battery cell 10.

[0169] In some embodiments, 0.2≤T≤2.

[0170] T can be any one of 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95, 1, 1.5, 2, or a range of values ​​between any two of them.

[0171] When T is ≥0.2, the strength of the first current collecting member 1 can be further improved, and the abutment effect of the first current collecting member 1 on the electrode assembly 2 can be improved; when T≤2, the material used for the first current collecting member 1 can be further saved, the space occupied by the first current collecting member 1 in the battery cell 10 can be reduced, and the energy density of the battery cell 10 can be improved. Therefore, when 0.2≤T≤2, the strength of the first current collecting member 1 can be further improved, and the energy density of the battery cell 10 can be further improved.

[0172] In some embodiments, the metal area 11 and / or the non-metal area 12 is provided with weight-reducing holes 13 .

[0173] The weight-reducing holes 13 may be formed in only the metal area 11, in only the non-metal area 12, or in both the metal area 11 and the non-metal area 12. The weight-reducing holes 13 may penetrate the first current collecting member 1 along the first direction X, or may penetrate the first current collecting member 1 along a direction intersecting the first direction X.

[0174] By opening the weight-reducing holes 13 in the metal region 11 and / or the non-metal region 12 , the weight of the first current collecting member 1 can be reduced, thereby reducing the weight of the battery cell 10 and achieving lightweighting of the battery cell 10 .

[0175] In some embodiments, the battery cell 10 also includes a shell 4, the electrode assembly 2 is accommodated in the shell 4, the shell 4 includes a first wall portion 41, along the first direction X, the first current collecting member 1 is arranged between the electrode assembly 2 and the first wall portion 41, the first wall portion 41 is provided with a pressure relief mechanism 5, and the weight reduction hole 13 is configured to guide the discharge located on the side of the first current collecting member 1 facing the electrode assembly 2 to the pressure relief mechanism 5.

[0176] The housing 4 may include a housing 42 and an end cap 43. The housing 42 is a component for accommodating the electrode assembly 2. The housing 42 may be a hollow structure with an opening formed at one end, or a hollow structure with openings formed at two opposite ends. The housing 42 may be in various shapes, such as a cylinder, a cuboid, etc. The housing 42 may be made of various materials, such as copper, iron, aluminum, steel, aluminum alloy, etc.

[0177] The end cap 43 is a component that covers the opening of the shell 42 to isolate the internal environment of the battery cell 10 from the external environment. The end cap 43 covers the opening of the shell 42, and the end cap 43 and the shell 42 together define a sealed space for accommodating the electrode assembly 2, the electrolyte and other components. The shape of the end cap 43 can be adapted to the shape of the shell 42. For example, the shell 42 is a rectangular parallelepiped structure, and the end cap 43 is a rectangular plate structure adapted to the shell 42. For another example, the shell 42 is a cylindrical structure, and the end cap 43 is a circular plate structure adapted to the shell 42. The material of the end cap 43 can also be a variety of materials, such as copper, iron, aluminum, steel, aluminum alloy, etc. The material of the end cap 43 can be the same as or different from the material of the shell 42.

[0178] The first wall portion 41 may be an end cover 43 , on which the electrode terminal 31 may be provided, and the electrode terminal 31 may be the first electrode lead-out portion 3 ; or the first wall portion 41 may be a wall of the shell 42 , and the first wall portion 41 may be the first electrode lead-out portion 3 .

[0179] The pressure relief mechanism 5 refers to an element or component that is actuated to release the internal pressure or temperature when the internal pressure or temperature of the battery cell 10 reaches a predetermined threshold. The threshold design varies according to different design requirements. The threshold may depend on one or more materials of the positive electrode plate, the negative electrode plate, the electrolyte and the separator in the battery cell 10. The pressure relief mechanism 5 can be in the form of an explosion-proof valve, an explosion-proof plate, a gas valve, a pressure relief valve or a safety valve, and can specifically adopt a pressure-sensitive or temperature-sensitive element or structure, that is, when the internal pressure or temperature of the battery cell 10 reaches a predetermined threshold, the pressure relief mechanism 5 performs an action or the weak structure provided in the pressure relief mechanism 5 is destroyed, thereby forming an opening or channel for the internal pressure or temperature to be released. It should be noted that the "actuation" mentioned in this application refers to the pressure relief mechanism 5 generating an action or being activated to a certain state, so that the internal pressure and temperature of the battery cell 10 can be released. The action generated by the pressure relief mechanism 5 may include but is not limited to: at least a part of the pressure relief mechanism 5 is broken, shattered, torn or opened, etc. When the pressure relief mechanism 5 is actuated, the high-temperature and high-pressure substances inside the battery cell 10 will be discharged from the actuated part as emissions. In this way, the battery cell 10 can be depressurized and cooled under controllable pressure or temperature, thereby avoiding potential more serious accidents. It should also be noted that the emissions from the battery cell 10 mentioned in this application include but are not limited to: electrolyte, dissolved or split positive and negative pole pieces, fragments of the isolation membrane, high-temperature and high-pressure gases generated by the reaction, flames, etc.

[0180] By arranging the first current collecting member 1 between the electrode assembly 2 and the first wall portion 41, the first current collecting member 1 abuts against the electrode assembly 2, and the first current collecting member 1 can improve the stability of the electrode assembly 2 in the housing 4. By arranging the pressure relief mechanism 5 on the first wall portion 41, and opening the weight reduction holes 13 in the metal area 11 and / or the non-metal area 12, the discharge on the side of the first current collecting member 1 facing the electrode assembly 2 can pass through the weight reduction holes 13 and be guided to the pressure relief mechanism 5, thereby achieving pressure relief of the battery cell 10 and reducing the risk of fire or even explosion of the battery cell 10 due to untimely pressure relief.

[0181] In some embodiments, the metal region 11 is made of aluminum, aluminum alloy, copper or copper alloy.

[0182] In some embodiments, the material of the non-metal region 12 is ceramic, polypropylene, polyphenylene sulfide or polycarbonate.

[0183] In some embodiments, a projection of the first electrode lead portion 3 along the first direction X at least partially overlaps with a projection of the metal region 11 along the first direction X.

[0184] A portion of the projection of the first electrode lead-out portion 3 along the first direction X may overlap with a portion of the projection of the metal area 11 along the first direction X; a portion of the projection of the first electrode lead-out portion 3 along the first direction X may be located within the projection of the metal area 11 along the first direction X; a portion of the projection of the metal area 11 along the first direction X may be located within the projection of the first electrode lead-out portion 3 along the first direction X; or the entire projection of the first electrode lead-out portion 3 along the first direction X may overlap with the entire projection of the metal area 11 along the first direction X.

[0185] By at least partially overlapping the projection of the first electrode lead-out portion 3 along the first direction X with the projection of the metal area 11 along the first direction X, the first electrode lead-out portion 3 and the metal area 11 can be stacked in the first direction X, thereby facilitating electrical connection between the first electrode lead-out portion 3 and the metal area 11.

[0186] In some embodiments, please refer to Fig.13 and Fig.14 , Fig.13 An exploded view of a battery cell 10 provided in some other embodiments of the present application; Fig.14 The assembly diagram of the battery cell 10 provided in some embodiments of the present application. The battery cell 10 further includes a housing 4, in which the electrode assembly 2 is accommodated, and the housing 4 has a first wall portion 41, and along the first direction X, the first current collecting member 1 is located between the electrode assembly 2 and the first wall portion 41. Among them, the first electrode lead-out portion 3 is the first wall portion 41.

[0187] The battery cell 10 includes a first electrode lead-out portion 3 and a second electrode lead-out portion 3a, which are arranged opposite to each other along a first direction X, and a housing 4 has a first wall portion 41 and a second wall portion 44 arranged opposite to the first wall portion 41. The first electrode lead-out portion 3 may be the first wall portion 41, and the second electrode lead-out portion 3a may be the electrode terminal 31 arranged on the second wall portion 44. One of the first wall portion 41 and the second wall portion 44 may be the end cap 43, and the other may be the wall portion on the housing 42 opposite to the end cap 43; or the housing 4 may have two oppositely arranged end caps 43, and the first wall portion 41 and the second wall portion 44 are two end caps 43 respectively.

[0188] In some embodiments, the battery cell 10 further includes a housing 4, the electrode assembly 2 is accommodated in the housing 4, the housing 4 has a first wall portion 41, and the first current collecting member 1 is located between the electrode assembly 2 and the first wall portion 41 along the first direction X. The first electrode lead portion 3 is an electrode terminal 31 disposed on the first wall portion 41.

[0189] As an example, please refer to Fig.13 and Fig.14The electrode assembly 2 has a first pole tab 211 and a second pole tab 212 with opposite polarities, the housing 4 includes a shell 42 and two end caps 43 arranged opposite to each other, the two end caps 43 are respectively a first wall portion 41 and a second wall portion 44, an electrode terminal 31 is arranged on one end cap 43, and the other end cap 43 is a second electrode lead portion 3a, the electrode assembly 2 is located between the two end caps 43, the first current collecting member 1 is electrically connected to the electrode terminal 31 and the first pole tab 211 of the electrode assembly 2, and the second current collecting member 6 is electrically connected to the second electrode lead portion 3a and the second pole tab 212 of the electrode assembly 2. Among them, the second current collecting member 6 has the same structure as the first current collecting member 1.

[0190] In some embodiments, please refer to Fig.15 , Fig.15 The assembly diagram of the electrode terminal 31, the metal area 11, the electrode assembly 2 and the housing 42 provided in some embodiments of the present application. The first electrode lead-out portion 3 is the electrode terminal 31 disposed on the first wall portion 41, and the projection of the electrode terminal 31 along the first direction X is located in the metal area 11.

[0191] As an example, see Fig.15 The metal region 11 abuts against the electrode assembly 2 , the metal region 11 connects the electrode assembly 2 and the electrode terminal 31 , and along the first direction X, the projection of the electrode terminal 31 is located within the metal region 11 .

[0192] In the above embodiment, the projection of the electrode terminal 31 along the first direction X is located within the metal region 11 , which can increase the contact area between the electrode terminal 31 and the metal region 11 , improve the current carrying capacity of the metal region 11 , and increase the utilization rate of the metal region 11 .

[0193] An embodiment of the present application provides a battery 100, comprising a battery cell 10 provided in any one of the above embodiments.

[0194] An embodiment of the present application provides an electrical device, including a battery cell 10 provided by any one of the above embodiments or a battery 100 provided by any one of the above embodiments, wherein the battery cell 10 is used to provide electrical energy to the electrical device.

[0195] Please continue to refer to Figure 6 , Figure 7 , Fig.13 and Fig.14. The embodiment of the present application provides a battery cell 10, including a shell 4, an electrode assembly 2, an electrode terminal 31, a first current collecting member 1 and a second current collecting member 6. The electrode assembly 2 is disposed in the shell 4. The shell 4 includes two end covers 43 and a shell 42, the two end covers 43 are arranged along the first direction X, and one of the two end covers 43 is provided with an electrode terminal 31. The first current collecting member 1 and the second current collecting member 6 are respectively arranged between the two end covers 43 and the electrode assembly 2. The first current collecting member 1 and the second current collecting member 6 are respectively abutted against the electrode assembly 2 to stabilize the position of the electrode assembly 2 in the shell 4. The first current collecting member 1 includes a metal area 11 and a non-metal area 12, the metal area 11 of the first current collecting member 1 is electrically connected to the electrode terminal 31 and the electrode assembly 2 provided at one end cover 43, and the metal area 11 of the second current collecting member 6 is electrically connected to the other end cover 43 and the electrode assembly 2. The first current collecting member 1 and the second current collecting member 6 have the same structure. The metal region 11 and the non-metal region 12 of the first current collecting member 1 abut against the electrode assembly 2 along the first direction X to stabilize the position of the electrode assembly 2 in the housing 4 .

[0196] By placing the first current collecting member 1 and the second current collecting member 6 against the electrode assembly 2 in the first direction X, the position of the electrode assembly 2 in the housing 4 can be stabilized, thereby improving the structural stability of the battery cell 10. The non-metallic region 12 of the first current collecting member 1 can reduce the metal content of the first current collecting member 1, reduce the production cost of the current collecting member, and thus reduce the cost of the battery cell 10, thereby having better economy.

[0197] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0198] The above embodiments are only used to illustrate the technical solution of the present application and are not used to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery cell, characterized in that: include: Electrode assembly; A first electrode lead-out portion, used for inputting or outputting electric energy of the battery cell; A first current collecting member is disposed between the electrode assembly and the first electrode lead-out portion along a first direction, the first current collecting member includes a metal area and a non-metal area, the metal area electrically connects the electrode assembly and the first electrode lead-out portion, the non-metal area is connected to the metal area, and along the first direction, the metal area and the non-metal area both abut against the electrode assembly.

2. The battery cell according to claim 1, characterized in that: The metal zone includes a first part and a first connecting portion, and the non-metal zone includes a second part and a second connecting portion. The projection of the first part along the first direction does not overlap with the projection of the second part along the first direction. The first part and the second part are both against the electrode assembly, and the first connecting portion and the second connecting portion are plugged into each other to fix the metal zone and the non-metal zone.

3. The battery cell according to claim 2, characterized in that: The second part has a hollow portion, which passes through the second part along the first direction, and the first part is located in the hollow portion. The second connecting portion includes a first protrusion arranged on the wall of the hollow portion, and the first connecting portion has a side surface arranged opposite to the wall surface of the hollow portion. The first connecting portion includes a first hole portion arranged on the side surface, and at least a portion of the first protrusion is inserted into the first hole portion.

4. The battery cell according to claim 3, characterized in that: The wall surface includes a first surface and a second surface, the first surface and the second surface are arranged at an acute angle, and the first surface and the second surface are both provided with the first protrusion.

5. The battery cell according to claim 3, characterized in that: The second connecting portion includes a second protrusion protruding from the surface of the second portion along the first direction; The first connection portion includes a lap portion connected to the first portion, the lap portion and the second portion are stacked along the first direction, the lap portion is provided with a second hole portion, and at least a portion of the second protrusion is inserted into the second hole portion.

6. The battery cell according to claim 1, characterized in that: The metal area includes a first part, and the non-metal area includes a second part. The projection of the first part along the first direction does not overlap with the projection of the second part along the first direction. The first part and the second part are both against the electrode assembly. The first part and the second part are spliced ​​into a disc structure.

7. The battery cell according to claim 6, characterized in that: The area of ​​the projection of the first part along the first direction is S1, the area of ​​the projection of the second part along the first direction is S2, and 0.02≤S1 / S2≤10.

8. The battery cell according to claim 6, characterized in that: 0.2≤S1 / S2≤1.

9. The battery cell according to claim 1, characterized in that: The density of the non-metallic region is lower than that of the metallic region.

10. The battery cell according to claim 1, characterized in that: The electrode assembly has a first electrode tab, the metal region electrically connects the first electrode tab and the first electrode lead-out portion, and along the first direction, the metal region and the non-metal region both abut against the first electrode tab.

11. The battery cell according to claim 10, characterized in that: Along the first direction, the metal area has a first end surface, and the non-metal area has a second end surface. The first end surface and the second end surface both abut against the first electrode tab, and the first end surface is flush with the second end surface.

12. The battery cell according to claim 10, characterized in that: The electrode assembly is a winding structure. Along the radial direction of the electrode assembly, the maximum distance from the first electrode tab to the center line of the electrode assembly is L1, the maximum distance from the metal area to the center line of the electrode assembly is L2, and 0.5≤L2 / L1≤1.

13. The battery cell according to claim 12, characterized in that: 0.8≤L2 / L1≤1.

14. The battery cell according to claim 1, characterized in that: Along the first direction, the thickness of the first current collecting member is T, and 0.1≤T≤5.

15. The battery cell according to claim 14, characterized in that: 0.2≤T≤2。 16. The battery cell according to any one of claims 1 to 15, characterized in that: The metal area and / or the non-metal area are provided with weight-reducing holes.

17. The battery cell according to claim 16, characterized in that: The battery cell also includes a shell, the electrode assembly is accommodated in the shell, the shell includes a first wall portion, along the first direction, the first current collecting member is arranged between the electrode assembly and the first wall portion, the first wall portion is provided with a pressure relief mechanism, and the weight reduction hole is configured to guide the discharge located on the side of the first current collecting member facing the electrode assembly to the pressure relief mechanism.

18. The battery cell according to any one of claims 1 to 15, characterized in that: The material of the metal area is one of aluminum, aluminum alloy, copper or copper alloy.

19. The battery cell according to any one of claims 1 to 15, characterized in that: The material of the non-metallic area is one of ceramic, polypropylene, polyphenylene sulfide or polycarbonate.

20. The battery cell according to any one of claims 1 to 15, characterized in that: A projection of the first electrode lead-out portion along the first direction at least partially overlaps with a projection of the metal region along the first direction.

21. The battery cell according to any one of claims 1 to 15, characterized in that: The battery cell further includes a housing, the electrode assembly is accommodated in the housing, the housing has a first wall portion, and along the first direction, the first current collecting member is located between the electrode assembly and the first wall portion; The first electrode lead-out portion is the first wall portion; or the first electrode lead-out portion is an electrode terminal disposed on the first wall portion.

22. The battery cell according to claim 21, characterized in that The first electrode lead-out portion is an electrode terminal disposed on the first wall portion, and a projection of the electrode terminal along the first direction is located within the metal region.

23. A battery, characterized in that: Comprising a battery cell as claimed in any one of claims 1 to 22.

24. An electrical equipment, characterized in that: It comprises the battery cell according to any one of claims 1 to 22 or the battery according to claim 23, wherein the battery cell is used to provide electrical energy to the electrical device.

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