Battery monomer, battery device and electric equipment

Abstract

The utility model provides a battery monomer, a battery device and electric equipment, the battery monomer comprises a shell, an electrode assembly, a conductive member and an electrode terminal, the shell has an accommodating cavity, the electrode assembly is arranged in the accommodating cavity, the electrode assembly comprises a pole piece, and the pole piece comprises a conductor layer and an active material layer; the conductor layer comprises a main body part and a protruding part which are distributed in the first direction, active material layers are arranged on the surfaces of the two sides of the main body part in the thickness direction, the protruding part protrudes out of the active material layers in the first direction, the first direction and the thickness direction intersect, and a conductive component is arranged on at least one side of the protruding part in the thickness direction. The conductive component and at least part of the protruding part are stacked and fixedly connected; the electrode terminal is provided in the housing, and the electrode terminal is electrically connected to the conductive member. The reliability of the battery monomer can be improved.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery cell, a battery device, and an electrical appliance. Background Technology

[0002] Battery cells are widely used in electronic devices such as mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, and power tools, etc.

[0003] In the development of battery technology, improving the reliability of individual battery cells is a key research direction. Utility Model Content

[0004] In view of the above problems, this application provides a battery cell, a battery device, and an electrical device that can improve the reliability of the battery cell.

[0005] In a first aspect, this application provides a battery cell, including a casing, an electrode assembly, a conductive member, and electrode terminals. The casing has a receiving cavity, and the electrode assembly is disposed in the receiving cavity. The electrode assembly includes an electrode sheet, which includes a conductor layer and an active material layer. The conductor layer includes a main body portion and a protrusion portion distributed along a first direction. The main body portion has active material layers disposed on both sides of its thickness direction. The protrusion portion protrudes from the active material layer in the first direction, and the first direction and the thickness direction intersect. The protrusion portion has a conductive member disposed on at least one side in the thickness direction. The conductive member and at least a portion of the protrusion portion are stacked and fixedly connected. The electrode terminals are disposed in the casing and are electrically connected to the conductive member.

[0006] One embodiment of this application provides a battery cell in which an electrode assembly is disposed within a receiving cavity and electrically connected to electrode terminals via a conductive member, thereby fulfilling the charging and discharging requirements of the battery cell. Since the protrusion of the conductor layer has a conductive member on at least one side in the thickness direction, during the forming of the electrode assembly, the substrate forming the conductive member can be first connected to the conductor layer of the electrode sheet, and then the entire assembly can be die-cut to form the protrusion and the conductive member. This reduces the probability of cracking or other problems occurring in the electrode sheet during the forming process, thereby improving the overall reliability of the battery cell.

[0007] In some embodiments, the protrusion includes a first protrusion and a second protrusion distributed sequentially along a first direction, the first protrusion being connected between the second protrusion and the main body; in a second direction, the width of the first protrusion is greater than the width of the second protrusion, and a conductive member covers at least a portion of the first protrusion and at least a portion of the second protrusion, the first direction, the second direction, and the thickness direction being arranged to intersect each other.

[0008] In one embodiment of this application, a battery cell is provided. Through the above-described configuration, before the substrate for forming the electrode sheet is die-cut to form the main body and protrusions, a metal foil can be fixedly connected to the electrode sheet forming substrate. The metal foil can be aluminum foil or copper foil. Then, the electrode sheet forming substrate is die-cut. At this time, due to the connection of the metal foil, the strength of the die-cutting position can be increased, the probability of tearing when forming the protrusions during the die-cutting process can be reduced, and the probability of tearing of the tabs formed by multiple protrusions stacked after the electrode sheet is wound or stacked can be reduced, thereby improving the reliability of the battery cell.

[0009] In some embodiments, along a first direction, the conductive member is connected and fixed to the protrusion to form a connection area, the extension length of the connection area is L3, and the extension length of the first protrusion is L6, wherein 1 / 5*L3≤L6≤4 / 5*L3.

[0010] One embodiment of this application provides a battery cell that, through the above-described configuration, minimizes the height of the first protrusion while maintaining a height limit for the electrode assembly along the first direction, thereby increasing the height of the conductor layer and the active material layer in the first direction and improving the capacity of the battery cell.

[0011] In some embodiments, the conductive member is connected and fixed to the protrusion to form a connection area, and the minimum vertical distance between the connection area and the active material layer along the first direction is L2, wherein 0≤L2≤10mm.

[0012] One embodiment of this application provides a battery cell that, through the above-described configuration, helps to ensure the tear resistance of the protrusions formed after die-cutting, thereby improving the reliability of the battery cell.

[0013] In some embodiments, the extension length of the connection region along the first direction is L3, wherein L3 ≥ 2 mm.

[0014] One embodiment of this application provides a battery cell that ensures the connection strength and overcurrent capacity between the conductive component and the protrusion by making the extension length of the connection area L3 greater than or equal to 2mm.

[0015] In some embodiments, along the first direction, the extension length L3 of the connection region is less than or equal to two-thirds of the extension length of the conductive member.

[0016] One embodiment of this application provides a battery cell with the above-described configuration. This configuration helps to reduce the difficulty of connecting the conductive component and the protrusion, ensures the connection strength and current carrying capacity between the conductive component and the protrusion, and also reduces the bending radius after bending, thus reducing the space required for bending the tab.

[0017] In some embodiments, the extension length of the conductive member along the first direction ranges from 10 mm to 50 mm.

[0018] The battery cell provided in one embodiment of this application, through the above-described configuration, can ensure the connection length requirement between the electrode assembly and the adapter plate, and can also ensure the connection requirement with the protrusion.

[0019] In some embodiments, conductive members are provided on both sides of the protrusion in the thickness direction.

[0020] In some embodiments, among the conductive members located on both sides of the protrusion, one has an extension length of L1 in a first direction and the other has an extension length of L4, wherein L1 > L4.

[0021] The battery cell provided in one embodiment of this application, through the above-described configuration, not only reduces the probability of problems such as cracking of the electrode sheet during the forming process, but also ensures that the thickness of the tab formed by the protrusion and the conductive component is reduced, which is beneficial to reducing the space required for tab bending.

[0022] In some embodiments, the conductive member is connected and fixed to the protrusion to form a connection area, the extension length of the connection area in the first direction is L3, and the extension length of the conductive members located on both sides of the protrusion in the first direction satisfies: L3≤L4<4 / 5*L1.

[0023] The above settings can reduce the probability of cracking of the electrode sheet during the forming process and reduce the space required for bending the electrode tab.

[0024] In some embodiments, the conductive member is connected and fixed to the protrusion to form a connection area, and the electrode assembly further includes a connecting colloid. Along a first direction, the connecting colloid is disposed on the side of the connection area away from the active material layer, and the conductive member and the protrusion are connected by the connecting colloid; or, the two conductive members are connected by the connecting colloid.

[0025] One embodiment of this application provides a battery cell that, by incorporating a connecting colloid, can effectively reduce cracking caused by sudden changes in strength between the connecting and non-connecting areas, thereby ensuring the reliability of the battery cell.

[0026] In some embodiments, the extension length of the connecting colloid along the first direction is L5, wherein L5 ≥ 3 mm.

[0027] The battery cell provided in one embodiment of this application, through the above-described configuration, reduces the difficulty of the molding process and helps to improve the cracking problem caused by the sudden change in strength between the protrusion and the conductive component in the connection area and the non-connection area.

[0028] In some embodiments, the connecting colloid and the connecting region are successively distributed along the first direction.

[0029] One embodiment of this application provides a battery cell in which the connecting colloid and the connecting region are successively provided, which facilitates seamless connection between the connecting region and the connecting colloid and reduces the risk of cracking caused by sudden changes in strength.

[0030] In some embodiments, a conductive member is provided on one side of the protrusion in the thickness direction, and a connecting adhesive is connected between the conductive member and the protrusion.

[0031] The above configuration helps to ensure the reliability of the electrode assembly when the protrusion has a conductive component on one side.

[0032] In some embodiments, conductive members are provided on both sides of the protrusion in the thickness direction, and a connecting adhesive is connected between the protrusion and at least one conductive member.

[0033] The battery cell provided in one embodiment of this application, through the above-described configuration, helps to ensure the reliability of the electrode assembly when conductive members are provided on both sides of the protrusion.

[0034] In some embodiments, conductive members are provided on both sides of the protrusion in the thickness direction. Along the first direction, the extension length of the protrusion is less than the extension length of the conductive member. The protrusion and the conductive members on both sides enclose a receiving cavity. A connecting adhesive is provided in the receiving cavity, and the connecting adhesive connects the two conductive members.

[0035] The battery cell provided in one embodiment of this application, through the above-described configuration, ensures the reliability of the motor assembly and thus the reliability of the battery cell when conductive members are provided on both sides of the protrusion in the thickness direction.

[0036] In some embodiments, the thickness of the connecting adhesive is less than the thickness of the protrusion.

[0037] One embodiment of this application provides a battery cell that, through the above-described configuration, enables the electrode assembly to reduce its bending radius and occupied area when bent and connected to the electrode terminals.

[0038] Secondly, this application provides a battery device including the aforementioned battery cell.

[0039] Thirdly, this application provides an electrical device including the aforementioned battery device.

[0040] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0041] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0042] Figure 1 This is a schematic diagram of the structure of a vehicle provided in one embodiment of this application;

[0043] Figure 2 This is a schematic diagram of the structure of a battery provided in one embodiment of this application;

[0044] Figure 3 This is an exploded structural diagram of a battery cell provided in an embodiment of this application;

[0045] Figure 4 This is a partial structural schematic diagram of an electrode sheet provided in one embodiment of this application;

[0046] Figure 5 This is a partial cross-sectional view of an electrode sheet provided in one embodiment of this application;

[0047] Figure 6 This is a partial top view of an electrode sheet provided in one embodiment of this application;

[0048] Figure 7 This is a partial cross-sectional view of an electrode provided in another embodiment of this application;

[0049] Figure 8 This is a partial cross-sectional view of an electrode sheet provided in yet another embodiment of this application;

[0050] Figure 9 This is a partial cross-sectional view of an electrode provided in another embodiment of this application;

[0051] Figure 10 This is a partial cross-sectional view of an electrode sheet provided in yet another embodiment of this application;

[0052] Figure 11 This is a partial cross-sectional view of an electrode provided in another embodiment of this application;

[0053] Figure 12 This is a partial cross-sectional view of an electrode provided in another embodiment of this application.

[0054] Marker explanation:

[0055] 1. Vehicle; 100. Battery; 200. Battery module; 300. Controller; 400. Motor;

[0056] 10. Box body; 11. First box body section; 12. Second box body section;

[0057] 20. Battery cell;

[0058] 20a. Outer casing; 20b. Electrode terminals;

[0059] 21. Shell; 211. Opening;

[0060] 22. Electrode assembly; 221. Electrode sheet; 2211. Conductor layer; 2211a. Main body; 2211b. Protrusion; 2211c. First protrusion; 2211d. Second protrusion; 2212. Active material layer; 2213. Connecting region; 2214. Connecting colloid;

[0061] 23. Conductive components;

[0062] 24. Cover plate;

[0063] X, thickness direction; Y, first direction; Z, second direction. Detailed Implementation

[0064] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0065] It should be noted that, unless otherwise stated, the technical or scientific terms used in the embodiments of this application should have the ordinary meaning understood by those skilled in the art to which the embodiments of this application pertain.

[0066] In the description of the embodiments of this application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0067] Furthermore, technical terms such as "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. In the description of the embodiments of this application, "a plurality of" means two or more, unless otherwise explicitly defined.

[0068] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0069] In the description of the embodiments of this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0070] Unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical solutions.

[0071] Currently, the application of rechargeable batteries is becoming increasingly widespread, judging from market trends. They are not only used in energy storage systems for hydropower, thermal power, wind power, and solar power plants, but also extensively in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of rechargeable battery applications, market demand is also constantly increasing.

[0072] The secondary battery mentioned in the embodiments of this application refers to a single physical module comprising one or more battery cells to provide higher voltage and capacity. For example, the battery mentioned in this application may include a battery module or a battery pack. A battery generally includes a casing for encapsulating one or more battery cells. The casing prevents liquids or other foreign matter from affecting the charging or discharging of the battery cells.

[0073] During the manufacturing process of a battery cell, the tabs used to connect to the electrode terminals are susceptible to tearing due to external forces, affecting the overall reliability of the battery cell. Research has found that during the manufacturing process, the electrode sheets need to be die-cut to form the tabs. The tab area may be subjected to external forces during manufacturing, causing tearing. After tearing, the electronic pathway will be affected, further leading to capacity loss of the electrode at the crack. At the same time, the torn area is prone to inward flipping, causing two electrodes with different polarities inside the electrode assembly to overlap and cause an internal short circuit, affecting the reliability of the battery cell.

[0074] To improve the reliability of battery cells, research has found that increasing the strength of the electrode die-cutting location can alleviate the tearing problem that occurs during electrode die-cutting. Based on the above considerations, to improve the reliability of battery cells, a battery cell was designed after in-depth research, including a shell, an electrode assembly, a conductive member, and electrode terminals. The shell has a receiving cavity, and the electrode assembly is disposed in the receiving cavity. The electrode assembly includes an electrode, which includes a conductor layer and an active material layer. The conductor layer includes a main body portion and a protrusion portion distributed along a first direction. The main body portion has active material layers disposed on both sides of its thickness direction. The protrusion portion protrudes from the active material layer in the first direction, and the first direction and the thickness direction intersect. A conductive member is disposed on at least one side of the protrusion portion in the thickness direction. The conductive member and at least a portion of the protrusion portion are stacked and fixedly connected. The electrode terminals are disposed in the shell and electrically connected to the conductive member.

[0075] In such a battery cell, the electrode assembly is disposed within a cavity and electrically connected to the electrode terminals via conductive members to meet the charging and discharging requirements of the battery cell. Since the protrusions of the conductor layer have conductive members on at least one side in the thickness direction, during the forming process of the electrode assembly, the substrate forming the conductive members can be first connected to the conductor layer of the electrode sheet, and then the entire assembly can be die-cut to form the protrusions and conductive members. This reduces the probability of cracking or other problems occurring in the electrode sheet during the forming process, thereby improving the overall reliability of the battery cell.

[0076] The technical solutions described in the embodiments of this application are applicable to batteries and electrical devices that use batteries.

[0077] Electrical devices can be vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, etc. Electrical devices can also be energy storage devices, which can be used, but are not limited to, in small-scale, medium-sized, and large-scale industrial and commercial applications, photovoltaic-storage charging stations, and small-to-medium-sized microgrids, as well as in wind-solar-storage power stations, grid-connected energy storage power stations, and large-scale microgrid power station scenarios, for the storage and release of electrical energy.

[0078] It should be understood that the technical solutions described in the embodiments of this application are not limited to the batteries and electrical devices described above, but can also be applied to all batteries including housings and electrical devices using batteries. However, for the sake of brevity, the following embodiments are all illustrated using electric vehicles as examples.

[0079] For example, such as Figure 1 The diagram shown is a structural schematic of a vehicle 1 according to one embodiment of this application. Vehicle 1 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A motor 400, a controller 300, and a battery 100 can be installed inside vehicle 1. The controller 300 controls the battery 100 to supply power to the motor 400. For example, the battery 100 can be installed at the bottom, front, or rear of vehicle 1. The battery 100 can be used to power vehicle 1. For example, the battery 100 can serve as the operating power source for vehicle 1, for example, for the electrical system of vehicle 1, such as for the power requirements of vehicle 1's starting, navigation, and operation. In another embodiment of this application, the battery 100 can not only serve as the operating power source for vehicle 1, but also as the driving power source for vehicle 1, replacing or partially replacing gasoline or natural gas to provide driving power for vehicle 1.

[0080] like Figure 2 as well as Figure 3 As shown, to meet different power demands, battery 100 may include multiple battery cells 20, which can be connected in series, parallel, or a combination thereof. Battery 100 can also be referred to as a battery pack. Optionally, multiple battery cells 20 can first be connected in series, parallel, or a combination thereof to form a battery module 200, and then multiple battery modules 200 can be connected in series, parallel, or a combination thereof to form battery 100. That is, multiple battery cells 20 can directly form battery 100, or they can first form battery modules 200, and then the battery modules 200 can be assembled into battery 100.

[0081] For example, such as Figure 2 The diagram shown is a structural schematic of a battery 100 according to an embodiment of this application. The battery 100 may include a plurality of battery cells 20. The battery 100 may also include a housing 10 (or cover), the housing 10 having a hollow internal structure, and the plurality of battery cells 20 are housed within the housing 10.

[0082] The housing 10 can be a simple three-dimensional structure such as a cuboid, cylinder, or sphere, or it can be a complex three-dimensional structure composed of simple three-dimensional structures such as cuboids, cylinders, or spheres. This application embodiment does not limit this. The material of the housing 10 can be an alloy material such as aluminum alloy or iron alloy, or a polymer material such as polycarbonate or polyisocyanurate foam, or a composite material such as glass fiber and epoxy resin. This application embodiment also does not limit this.

[0083] The housing 10 is used to accommodate the battery cell 20, and the housing 10 can have various structures. In some embodiments, the housing 10 may include a first housing portion 11 and a second housing portion 12, which overlap each other, and together define a receiving space for accommodating the battery cell 20. The second housing portion 12 may be a hollow structure with one end open, and the first housing portion 11 may be a plate-like structure, with the first housing portion 11 covering the open side of the second housing portion 12 to form a housing with a receiving space; alternatively, both the first housing portion 11 and the second housing portion 12 may be hollow structures with one side open, with the open side of the first housing portion 11 covering the open side of the second housing portion 12 to form a housing with a receiving space. Of course, the first housing portion 11 and the second housing portion 12 can have various shapes, such as cylinders, cuboids, etc.

[0084] To improve the sealing performance after the first housing part 11 and the second housing part 12 are connected, a sealing element, such as sealant or sealing ring, can also be provided between the first housing part 11 and the second housing part 12.

[0085] Assuming that the first box part 11 covers the top of the second box part 12, the first box part 11 can also be called the upper box cover, and the second box part 12 can also be called the lower box.

[0086] In battery 100, there can be one or more battery cells 20. If there are multiple battery cells 20, they can be connected in series, parallel, or in a mixed manner. A mixed connection means that multiple battery cells 20 are connected in both series and parallel. Multiple battery cells 20 can be directly connected in series, parallel, or in a mixed manner, and then the whole assembly of multiple battery cells 20 can be housed in a housing. Alternatively, multiple battery cells 20 can first be connected in series, parallel, or in a mixed manner to form a battery module 200, and then multiple battery modules 200 can be connected in series, parallel, or in a mixed manner to form a whole assembly, which is then housed in a housing 10.

[0087] In some embodiments, such as Figure 2 As shown, there are multiple battery cells 20. These multiple battery cells 20 are first connected in series, parallel, or in a mixed manner to form a battery module 200. The multiple battery modules 200 are then connected in series, parallel, or in a mixed manner to form a whole, which is housed in the casing.

[0088] Multiple battery cells 20 in the battery module 200 can be electrically connected through a busbar component to achieve parallel, series, or mixed connection of multiple battery cells 20 in the battery module 200.

[0089] In this application, the battery cell 20 may include lithium-ion battery cell 20, sodium-ion battery cell 20, or magnesium-ion battery cell 20, etc., and the embodiments of this application are not limited to this. The battery cell 20 may be cylindrical, flat, cuboid, or other shapes, and the embodiments of this application are not limited to this either. Battery cells 20 are generally divided into three types according to their packaging method: cylindrical battery cells 20, cuboid battery cells 20, and pouch battery cells 20, and the embodiments of this application are not limited to this either. However, for the sake of brevity, the following embodiments will all use a cuboid battery cell 20 as an example for description.

[0090] like Figures 3 to 5 As shown, the battery cell 20 may include a housing 20a, an electrode assembly 22, a conductive member 23, and an electrode terminal 20b. The housing 20a has a receiving cavity, and the electrode assembly 22 is disposed in the receiving cavity. The electrode assembly 22 includes an electrode sheet 221, which includes a conductor layer 2211 and an active material layer 2212. The conductor layer 2211 includes a main body portion 2211a and a protrusion portion 2211b distributed along a first direction Y. The main body portion 2211a has active material layers 2212 disposed on both sides of its thickness direction X. The protrusion portion 2211b protrudes from the active material layer 2212 in the first direction Y. The first direction Y and the thickness direction X intersect. The protrusion portion 2211b has a conductive member 23 disposed on at least one side of the thickness direction X. The conductive member 23 and at least a portion of the protrusion portion 2211b are stacked and fixedly connected. The electrode terminal 20b is disposed on the housing 20a and is electrically connected to the conductive member 23.

[0091] The housing 20a may include the housing 21 and the cover plate 24. The electrode terminal 20b may be disposed on the cover plate 24, or it may be disposed on the wall of the housing 21.

[0092] The housing 21 can have various shapes and sizes, such as cuboid, cylindrical, hexagonal prism, etc. Specifically, the shape of the housing 21 can be determined according to the specific shape and size of the electrode assembly 22. The material of the housing 21 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application embodiment does not impose any special limitations on this.

[0093] Electrode assembly 22 is a component in the battery cell 20 where electrochemical reactions occur. The housing 21 may contain one or more electrode assemblies 22.

[0094] The electrode assembly 22 may include two electrodes 221 with opposite polarities and a diaphragm. The two electrodes with opposite polarities and the diaphragm are wound together along the winding direction to form a winding structure, or a stacked structure may be formed by stacking.

[0095] One of the two poles with opposite polarities can be a positive electrode, and the other can be a negative electrode.

[0096] The separator can be made of materials such as PP (polypropylene) or PE (polyethylene). The separator can be sandwiched between two electrodes 221 with opposite polarities to insulate the two electrodes 221 from each other.

[0097] Taking electrode 221 as a positive electrode as an example, the conductor layer 2211 of electrode 221 has two surfaces opposite to each other in its own thickness direction X, and the active material layer 2212 of the positive electrode is disposed on either or both of the two opposite surfaces of conductor layer 2211.

[0098] As an example, the conductor layer 2211 of the positive electrode can also be called the positive current collector, which can be made of metal foil, conductive polymer material, or carbon material. For example, as a metal foil, it can be made of pure metal, alloy, or surface-treated metal, including but not limited to stainless steel, copper, aluminum, nickel, titanium, or silver.

[0099] As an example, the active material layer 2212 of the positive electrode may include at least one of the following materials: lithium phosphate, lithium transition metal oxide, and their respective modified compounds. However, this application is not limited to these materials, and other conventional materials that can be used as positive electrode active materials for batteries may also be used. These positive electrode active materials may be used alone or in combination of two or more. Examples of lithium phosphate may include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), lithium iron phosphate and carbon composites, lithium manganese phosphate (such as LiMnPO4), lithium manganese phosphate and carbon composites, lithium iron manganese phosphate, and lithium iron manganese phosphate and carbon composites. Examples of lithium transition metal oxides may include, but are not limited to, lithium cobalt oxide (such as LiCoO2), lithium nickel oxide (such as LiNiO2), lithium manganese oxide (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, and lithium nickel cobalt manganese oxide (such as LiNi). 1 / 3 Co 1 / 3Mn 1 / 3 O2 (also known as NCM) 333 LiNi 0.5 Co 0.2 Mn 0.3 O2 (also known as NCM) 523 LiNi0.5 Co 0.25 Mn 0.25 O2 (also known as NCM) 211 LiNi 0.6 Co 0.2 Mn 0.2 O2 (also known as NCM) 622 LiNi 0.8 Co 0.1 Mn 0.1 O2 (also known as NCM) 811 ), lithium nickel cobalt aluminum oxide (such as LiNi) 0.8 Co 0.15 Al 0.05 At least one of O2 and its modified compounds. Modified compounds refer to substances obtained by modification methods such as doping or coating based on the above-mentioned substances.

[0100] In some embodiments, the positive electrode sheet can be made of foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, or foamed carbon, etc. When foamed metal is used as the positive electrode sheet, the surface of the foamed metal may or may not have a positive active material layer, although a positive active material layer may be provided. As an example, a positive active material layer is filled and / or deposited within the foamed metal.

[0101] Of course, electrode 221 can also be a negative electrode. Taking electrode 221 as a negative electrode as an example, the conductor layer 2211 of the negative electrode can also be called the negative current collector, which can be made of metal foil, conductive polymer material, carbon material or composite current collector. For example, as a metal foil, it can be made of pure metal, alloy, or surface-treated metal, including but not limited to stainless steel, copper, aluminum, nickel, titanium or silver.

[0102] As an example, the negative electrode may include a conductor layer 2211 and an active material layer 2212 disposed on at least one surface of the conductor layer 2211.

[0103] As an example, the negative electrode 221 may include a conductor layer 2211 having two surfaces opposite each other in its own thickness direction X, and an active material layer 2212 disposed on either or both of the two opposite surfaces of the conductor layer 2211.

[0104] As an example, the active material layer 2212 may employ a negative electrode active material known in the art for use in battery cell 20. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate, etc. Silicon-based materials may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. Tin-based materials may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, this application is not limited to these materials, and other conventional materials that can be used as negative electrode active materials for battery cell 20 may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0105] In some embodiments, the negative electrode can be a foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, or foamed carbon, etc. When foamed metal is used as the negative electrode sheet, the surface of the foamed metal may or may not have a negative electrode active material.

[0106] As an example, negative electrode active material may be filled or / and deposited within the conductor layer 2211 of the negative electrode sheet.

[0107] In some embodiments, the conductor layer 2211 of the positive electrode can be made of aluminum, and the conductor layer 2211 of the negative electrode can be made of copper.

[0108] The conductor layer 2211 of the electrode 221 of different polarities may include a main body 2211a and a protrusion 2211b. The main body 2211a is provided with an active material layer 2212. The protrusion 2211b protrudes from the active material layer 2212 in the first direction Y. It can be understood that the protrusion 2211b is not provided with an active material layer 2212. The electrode 221 can be formed by winding or stacking. Multiple protrusions 2211b can be stacked to form an electrode tab.

[0109] The first direction Y can be the height direction of the battery cell 20, or the direction in which the casing 21 forms the opening 211.

[0110] The first direction Y and the thickness direction X are optional and can be set to be perpendicular.

[0111] The protrusion 2211b may have a conductive member 23 provided on one side of the thickness direction X, or it may have a conductive member 23 provided on both sides of the thickness direction X.

[0112] The conductive component 23 can be made of metal foil, and may optionally include metal foil such as aluminum foil or copper foil.

[0113] The conductive component 23 and the protrusion 2211b can be fixedly connected by welding, conductive adhesive bonding or other methods. Welding is an option to connect them.

[0114] The electrode terminals 20b can be arranged in pairs with opposite polarities, and each electrode terminal 20b is electrically connected to the electrode assembly 22.

[0115] One embodiment of this application provides a battery cell 20, which includes a casing 20a, an electrode assembly 22, a conductive member 23, and an electrode terminal 20b. The electrode assembly 22 is disposed within a receiving cavity and electrically connected to the electrode terminal 20b via the conductive member 23, thereby fulfilling the charging and discharging requirements of the battery cell 20. Since the protrusion 2211b of the conductor layer 2211 has a conductive member 23 on at least one side in the thickness direction X, during the molding of the electrode assembly 22, the substrate forming the conductive member 23 can be first connected to the conductor layer 2211 of the electrode sheet 221, and then the entire assembly can be die-cut to form the protrusion 2211b and the conductive member 23. This reduces the probability of cracking or other problems occurring in the electrode sheet 221 of the electrode assembly 22 during the molding process, thereby improving the overall reliability of the battery cell 20.

[0116] like Figures 4 to 6 As shown, in some optional embodiments, a battery cell 20 provided in one embodiment of this application has a protrusion 2211b including a first protrusion 2211c and a second protrusion 2211d successively distributed along a first direction Y. The first protrusion 2211c is connected between the second protrusion 2211d and the main body portion 2211a. In the second direction Z, the width of the first protrusion 2211c is greater than the width of the second protrusion 2211d. A conductive member 23 covers at least a portion of the first protrusion 2211c and at least a portion of the second protrusion 2211d. The first direction Y, the second direction Z and the thickness direction X are intersecting each other.

[0117] The second direction Z can be set perpendicular to both the first direction Y and the thickness direction X.

[0118] In the second direction Z, the width of the first protrusion 2211c is greater than the width of the second protrusion 2211d. Optionally, the width of the first protrusion 2211c can be equal to the width of the main body 2211a.

[0119] In the thickness direction X, the conductive member 23 may cover a portion of the first protrusion 2211c and the second protrusion 2211d. It may also cover all of the first protrusion 2211c and all of the second protrusion 2211d. Of course, it may cover a portion of one of the first protrusion 2211c and the second protrusion 2211d and cover the other completely.

[0120] In one embodiment of this application, a battery cell 20 is provided. Through the above-described configuration, before the substrate for forming the electrode 221 is die-cut to form the main body 2211a and the protrusion 2211b, a metal foil can be fixedly connected to the electrode 221 forming substrate. The metal foil can be aluminum foil or copper foil. Then, the electrode 221 forming substrate is die-cut. At this time, since the metal foil is connected, the strength of the die-cutting position can be increased, and the probability of tearing when forming the protrusion 2211b during the die-cutting process can be reduced. This reduces the probability of tearing of the tab formed by multiple protrusions 2211b after the electrode 221 is wound or stacked, thereby improving the reliability of the battery cell 20.

[0121] Continue reading to section 4 Figure 6 As shown, in some optional embodiments, in one embodiment of this application, the battery cell 20 has a conductive member 23 connected and fixed to the protrusion 2211b to form a connection area 2213, the extension length of the connection area 2213 is L3, and the extension length of the first protrusion 2211c is L6, wherein 1 / 5*L3≤L6≤4 / 5*L3.

[0122] The conductive component 23 and the protrusion 2211b are fixedly connected by welding to form a connection area 2213, or they can be fixed by conductive adhesive. Welding is an optional method for forming the connection area 2213.

[0123] The extension length L3 of the connection area 2213 can be understood as the vertical distance between the connection position of the conductive member 23 and the protrusion 2211b along the first direction Y, from the starting end on the side facing the active material layer 2212 to the ending end on the side away from the active material layer 2212.

[0124] In one embodiment of this application, the battery cell 20 is configured such that, under the condition that the electrode assembly 22 has a height restriction requirement along the first direction Y, the height of the first protrusion 2211c is minimized, the height of the conductor layer 2211 and the active material layer 2212 in the first direction Y is increased, thereby improving the capacity of the battery cell 20.

[0125] Continue reading to section 4 Figure 6 As shown, in some optional embodiments, in one embodiment of this application, the battery cell 20 has a conductive member 23 connected and fixed to the protrusion 2211b to form a connection area 2213. Along the first direction Y, the minimum vertical distance between the connection area 2213 and the active material layer 2212 is L2, where 0≤L2≤10mm.

[0126] The minimum vertical distance L2 between the connection area 2213 and the active material layer 2212 can be understood as: along the first direction Y, the vertical distance between the position where the conductive member 23 and the protrusion 2211b are stacked and connected is the end facing the active material layer 2212 and the active material layer 2212.

[0127] The minimum vertical distance L2 between the connecting region 2213 and the active material layer 2212 can be any value between 0 and 10 mm, including the two end values ​​of 0 mm and 10 mm. L2 can be selected as any value between 2 mm and 8 mm, and the selectable values ​​of L2 include 3 mm, 4 mm, 5 mm, 6 mm, and 7 mm.

[0128] The battery cell 20 provided in one embodiment of this application, through the above-described configuration, helps to ensure the tear resistance of the position where the protrusion 2211b is formed after die-cutting, thereby improving the reliability of the battery cell 20.

[0129] Continue reading to section 4 Figure 6 As shown, in some optional embodiments, the battery cell 20 provided in one embodiment of this application has a connection region 2213 with an extension length of L3 along the first direction Y, wherein L3 ≥ 2 mm.

[0130] The extension length L3 of the connection region 2213 can be understood in the same way as above, and will not be repeated here.

[0131] The battery cell 20 provided in one embodiment of this application reduces the connection difficulty between the conductive member 23 and the protrusion 2211b by making the extension length of the connection area 2213 greater than or equal to 2mm, thereby ensuring the connection strength and current carrying capacity between the conductive member 23 and the protrusion 2211b.

[0132] In some alternative embodiments, in one embodiment of this application, the battery cell 20 has an extension length L3 of the connection region 2213 along the first direction Y that is less than or equal to two-thirds of the extension length of the conductive member 23.

[0133] The extension length of the conductive member 23 can be understood as the vertical distance along the first direction Y between the starting end of the conductive member 23 facing the active material layer 2212 and the ending end facing away from the active material layer 2212.

[0134] The battery cell 20 provided in one embodiment of this application, through the above-described configuration, helps to reduce the connection difficulty between the conductive member 23 and the protrusion 2211b, ensures the connection strength and current carrying capacity between the conductive member 23 and the protrusion 2211b, and at the same time reduces the bending radius after bending, which helps to reduce the space required for bending the tab.

[0135] In some optional embodiments, the battery cell 20 provided in one embodiment of this application has a conductive member 23 extending from 10 mm to 50 mm along the first direction Y.

[0136] The extension length of the conductive component 23 can be any value between 10mm and 50mm, including both 10mm and 50mm.

[0137] The battery cell 20 provided in one embodiment of this application, through the above-described configuration, can ensure the connection length requirement between the electrode assembly 22 and the electrode terminal, and can also ensure the connection requirement with the protrusion 2211b.

[0138] Continue reading to section 4 Figure 8 As shown, in some optional embodiments, the battery cell 20 provided in one embodiment of this application has conductive members 23 respectively provided on both sides of the protrusion 2211b in the thickness direction X.

[0139] The conductive members 23 on both sides of the protrusion 2211b in the thickness direction X can have the same structure, for example, their shape and size can be the same. Of course, the conductive members 23 on both sides of the protrusion 2211b in the thickness direction X can also have different structures, for example, the two conductive members 23 can have a difference in length along the first direction Y.

[0140] In one embodiment of this application, the battery cell 20 is configured in such a way that, during the molding of the electrode assembly 22, the substrate forming the conductive member 23 can be first connected to both sides of the conductor layer 2211 of the electrode sheet 221, and then the entire assembly is die-cut to form the protrusion 2211b and the conductive member 23. This three-layer structure can reduce the probability of cracking or other problems occurring in the electrode sheet 221 of the electrode assembly 22 during the molding process, thereby improving the overall reliability of the battery cell 20.

[0141] Please see Figure 7 As shown, in some optional embodiments, the battery cell 20 provided in one embodiment of this application is located in the conductive members 23 on both sides of the protrusion 2211b, one of which has an extension length of L1 in the first direction Y and the other has an extension length of L4, wherein L1 > L4.

[0142] The battery cell 20 provided in one embodiment of this application, through the above-described configuration, reduces the probability of cracking or other problems occurring in the electrode sheet 221 of the electrode assembly 22 during the molding process, while also ensuring that the thickness of the tab formed by the protrusion 2211b and the conductive member 23 is reduced, which is beneficial to reducing the space required for tab bending.

[0143] Please continue reading Figure 7As shown, in some optional embodiments, in one embodiment of this application, the battery cell 20 has a conductive member 23 connected and fixed to the protrusion 2211b to form a connection area 2213. The extension length of the connection area 2213 in the first direction Y is L3. The extension length of the conductive member 23 located on both sides of the protrusion 2211b in the first direction Y satisfies: L3≤L4<4 / 5*L1.

[0144] In other words, when conductive members 23 are provided on both sides of the protrusion 2211b and there is a difference in the length of the conductive members 23, the length value L4 of the conductive member 23 with the smaller length among the two conductive members 23 can satisfy L3≤L4<4 / 5*L1.

[0145] The above settings can reduce the probability of cracking of the electrode sheet 221 in the electrode assembly 22 during the molding process, and also reduce the space required for bending the electrode tab.

[0146] It is understood that the battery cell 20 provided in one embodiment of this application is not limited to having conductive members 23 respectively provided on both sides of the protrusion 2211b in the thickness direction X.

[0147] like Figure 9 As shown, in some embodiments, a conductive member 23 may also be provided on one side of the thickness direction X of the protrusion 2211b, which can also ensure the reliability requirements of the battery cell 20.

[0148] like Figures 10 to 12 As shown, in some optional embodiments, in one embodiment of the present application, the battery cell 20 has a conductive member 23 connected and fixed to the protrusion 2211b to form a connection area 2213. The electrode assembly 22 also includes a connecting adhesive 2214. Along the first direction Y, the connecting adhesive 2214 is disposed on the side of the connection area 2213 away from the active material layer 2212. The conductive member 23 and the protrusion 2211b are connected by the connecting adhesive 2214; or, the two conductive members 23 are connected by the connecting adhesive 2214.

[0149] The connection area 2213 can be understood as a fixed area where the conductive member 23 and the protrusion 2211b are connected by welding or other means. When the conductive member 23 is provided on one side of the thickness direction X of the protrusion 2211b, a connecting adhesive 2214 can be used to connect the conductive member 23 to the protrusion. When the conductive member 23 is provided on both sides of the protrusion 2211b in the thickness direction X, a connecting adhesive 2214 can be used to connect the two conductive members 23. Of course, a connecting adhesive 2214 can also be used to connect each conductive member 23 to the protrusion 2211b.

[0150] The bonding adhesive 2214 may be selected from at least one of pressure-sensitive adhesive, hot melt adhesive, or conductive adhesive.

[0151] The battery cell 20 provided in one embodiment of this application can effectively reduce cracking of the protrusion 2211b and the conductive member 23 between the connection area 2213 and the non-connection area 2213 due to sudden change in strength by providing a connecting colloid 2214, thereby ensuring the reliability of the battery cell 20.

[0152] Continue reading Figure 6 , Figures 10 to 12 As shown, in some optional embodiments, the battery cell 20 provided in one embodiment of this application has an extension length of L5 along the first direction Y, where L5 ≥ 3 mm.

[0153] The extension length L5 of the connecting colloid 2214 can be understood as the vertical distance between the side of the connecting colloid 2214 facing the active material layer 2212 along the first direction Y and the side facing away from the active material layer 2212.

[0154] The battery cell 20 provided in one embodiment of this application reduces the difficulty of the molding process through the above-described settings, and helps to improve the cracking problem caused by the sudden change in strength between the protrusion 2211b and the conductive member 23 in the connection area 2213 and the non-connection area 2213.

[0155] In some alternative embodiments, in one embodiment of this application, the battery cell 20 has a connecting colloid 2214 and a connecting region 2213 successively distributed along the first direction Y.

[0156] The successive distribution can be understood as the connection between the connecting colloid 2214 and the connecting region 2213.

[0157] In one embodiment of this application, the battery cell 20 is provided such that the connecting colloid 2214 and the connecting region 2213 are successively provided, which facilitates seamless connection between the connecting region 2213 and the connecting colloid 2214 and reduces the risk of cracking caused by sudden strength changes.

[0158] In some alternative embodiments, the battery cell 20 provided in one embodiment of this application may have a conductive member 23 provided on one side of the protrusion 2211b in the thickness direction X, and a connecting adhesive 2214 is connected between the conductive member 23 and the protrusion 2211b.

[0159] When the conductive member 23 is provided on one side of the protrusion 2211b in the thickness direction X, a connecting adhesive 2214 can be connected between the conductive member 23 and the protrusion 2211b.

[0160] The above configuration helps to ensure the reliability of the electrode assembly 22 when the protrusion 2211b is provided with the conductive member 23 on one side.

[0161] Optionally, when the conductive member 23 is provided on one side of the protrusion 2211b in the thickness direction X, the conductive member 23 can be provided with the same length as the protrusion 2211b and aligned on the side of the protrusion 2211b away from the active material layer 2212 in the first direction Y. Of course, it can also be longer than the protrusion 2211b and protrude from the protrusion 2211b in the first direction Y.

[0162] like Figure 10 , Figure 11 As shown, in some optional embodiments, the battery cell 20 provided in one embodiment of this application has a protrusion 2211b with conductive members 23 on both sides in the thickness direction X, and a connecting colloid 2214 connecting the protrusion 2211b and at least one conductive member 23.

[0163] The conductive members 23 provided on both sides of the protrusion 2211b in the thickness direction X may have the same structure or may have different structures, for example, there may be a difference in the extension dimension in the first direction Y.

[0164] The protrusion 2211b can be connected to one of the two conductive members 23 by a connecting adhesive 2214. Of course, the protrusion 2211b can also be connected to both conductive members 23 by a connecting adhesive 2214.

[0165] The battery cell 20 provided in one embodiment of this application, through the above-described arrangement, helps to ensure the reliability of the electrode assembly 22 when the protrusion 2211b is provided with conductive members 23 on both sides.

[0166] like Figure 11 As shown, optionally, when conductive members 23 are provided on both sides of the protrusion 2211b in the thickness direction X, the conductive members 23 on the side away from the active material layer 2212 in the first direction Y can be provided with the same length as the protrusion 2211b and aligned. Of course, they can also be longer than the protrusion 2211b and protrude from the protrusion 2211b in the first direction Y.

[0167] It is understood that when the protrusion 2211b is provided with conductive members 23 on both sides of the thickness direction X, it is not limited to the fact that the protrusion 2211b and at least one conductive member 23 are connected by a connecting adhesive 2214.

[0168] like Figure 10 As shown, in some optional embodiments, in one embodiment of this application, a battery cell 20 has a protrusion 2211b with conductive members 23 on both sides in the thickness direction X. Along the first direction Y, the extension length of the protrusion 2211b is less than the extension length of the conductive members 23. The protrusion 2211b and the conductive members 23 on both sides enclose a receiving cavity. A connecting adhesive 2214 is disposed in the receiving cavity, and the connecting adhesive 2214 connects the two conductive members 23.

[0169] The connecting adhesive 2214 disposed within the receiving cavity can bond and fix the two conductive components 23 together. Optionally, the connecting adhesive 2214 disposed within the receiving cavity can bond and fix the two conductive components 23 and the protrusion 2211b together.

[0170] The battery cell 20 provided in one embodiment of this application, through the above-described configuration, ensures the reliability of the motor assembly and thus the reliability of the battery cell 20 when conductive members 23 are provided on both sides of the protrusion 2211b in the thickness direction X.

[0171] In some alternative embodiments, the thickness of the connecting colloid 2214 in the battery cell 20 provided in one embodiment of this application is less than the thickness of the protrusion 2211b.

[0172] This can be understood as follows: along the thickness direction X, the vertical distance between the two end faces of the connecting colloid 2214 is less than the vertical distance between the two end faces of the protrusion 2211b.

[0173] In one embodiment of this application, the battery cell 20 is configured in such a way that the bending radius and the area occupied by the electrode assembly 22 can be reduced when it is bent and connected to the electrode terminal 20b.

[0174] In some alternative embodiments, the thickness H1 of the conductive member 23 of the battery cell 20 provided in one embodiment of this application satisfies 10μm≤H1≤18μm.

[0175] One embodiment of this application provides a battery cell 20, including a housing 20a, an electrode assembly 22, a conductive member 23, an electrode terminal 20b, and a connecting colloid 2214. The housing 20a has a receiving cavity, and the electrode assembly 22 is disposed in the receiving cavity. The electrode assembly 22 includes electrode sheets 221, which may include two electrodes with opposite polarities. One electrode sheet 221 may include a conductor layer 2211 and an active material layer 2212. The conductor layer 2211 includes a main body portion 2211a distributed along a first direction Y and protrusions 2211b. The main body portion 2211a has active material layers 2212 disposed on both sides of its thickness direction X. The protrusion 2211b protrudes from the active material layer 2212 in the first direction Y. The protrusion 2211b has conductive members 23 on both sides in the thickness direction X. The protrusion 2211b includes a first protrusion 2211c and a second protrusion 2211d distributed successively along the first direction Y. The first protrusion 2211c is connected between the second protrusion 2211d and the main body 2211a. In the second direction Z, the width of the first protrusion 2211c is greater than the width of the second protrusion 2211d. The conductive members 23 cover at least a portion of the first protrusion 2211c and at least a portion of the second protrusion 2211d. The first direction Y, the second direction Z and the thickness direction X are perpendicular to each other. Along the first direction Y, the conductive member 23 is connected and fixed to the protrusion 2211b to form a connection area 2213. The extension length of the connection area 2213 is L3, and the extension length of the first protrusion 2211c is L6, wherein L3 ≥ 2mm, and 1 / 5*L3 ≤ L6 ≤ 4 / 5*L3. The minimum vertical distance between the connection area 2213 and the active material layer 2212 is L2, wherein 0 ≤ L2 ≤ 10mm, and L3 ≥ 2mm. The extension length L3 of the connection area 2213 is less than or equal to two-thirds of the extension length of the conductive member 23. Along the first direction Y, the extension length of the conductive member 23 ranges from 10mm to 50mm. Of the conductive members 23 located on both sides of the protrusion 2211b, one has an extension length of L1 in the first direction Y, and the other has an extension length of L4, where L1 > L4. The extension lengths of the conductive members 23 on both sides of the protrusion 2211b in the first direction Y satisfy: L3 ≤ L4 < 4 / 5 * L1. Along the first direction Y, a connecting colloid 2214 is disposed on the side of the connecting region 2213 away from the active material layer 2212, and the connecting colloid 2214 and the connecting region 2213 are distributed successively. A connecting colloid 2214 connects the two layers of conductive members 23, and the extension length of the connecting colloid 2214 along the first direction Y is L5, where L5 ≥ 3 mm. The thickness of the connecting colloid 2214 is less than the thickness of the protrusion 2211b. The conductive component 23 and the protrusion 2211b are partially stacked and welded together. The electrode terminal 20b is disposed on the outer shell 20a and is electrically connected to the conductive component 23.

[0176] Secondly, this application provides a battery device including the aforementioned battery cell 20.

[0177] Thirdly, this application provides an electrical device including the aforementioned battery device.

[0178] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized in that, include: The outer shell has a receiving cavity; An electrode assembly is disposed in the receiving cavity. The electrode assembly includes an electrode sheet, which includes a conductor layer and an active material layer. The conductor layer includes a main body portion and a protrusion portion distributed along a first direction. The active material layer is disposed on both sides of the main body portion in its thickness direction. The protrusion portion protrudes from the active material layer in the first direction. The first direction and the thickness direction intersect. A conductive member, wherein the protrusion is provided with the conductive member on at least one side in the thickness direction, and the conductive member is stacked and fixedly connected to at least a portion of the protrusion; An electrode terminal is disposed on the housing and is electrically connected to the conductive component.

2. The battery cell according to claim 1, characterized in that, The protrusion includes a first protrusion and a second protrusion distributed sequentially along a first direction, the first protrusion being connected between the second protrusion and the main body; in a second direction, the width of the first protrusion is greater than the width of the second protrusion, the conductive member covers at least a portion of the first protrusion and at least a portion of the second protrusion, and the first direction, the second direction, and the thickness direction are arranged to intersect each other.

3. The battery cell according to claim 2, characterized in that, Along the first direction, the conductive member is connected and fixed to the protrusion to form a connection area, the extension length of the connection area is L3, and the extension length of the first protrusion is L6, wherein 1 / 5*L3≤L6≤4 / 5*L3.

4. The battery cell according to any one of claims 1 to 3, characterized in that, The conductive component is connected and fixed to the protrusion to form a connection area. Along the first direction, the minimum vertical distance between the connection area and the active material layer is L2, where 0≤L2≤10mm.

5. The battery cell according to claim 4, characterized in that, Along the first direction, the extension length of the connection area is L3, where L3 ≥ 2 mm.

6. The battery cell according to claim 5, characterized in that, Along the first direction, the extension length L3 of the connection area is less than or equal to two-thirds of the extension length of the conductive member.

7. The battery cell according to any one of claims 1 to 6, characterized in that, Along the first direction, the extension length of the conductive member ranges from 10mm to 50mm.

8. The battery cell according to any one of claims 1 to 7, characterized in that, The protrusion has conductive components on both sides in the thickness direction.

9. The battery cell according to claim 8, characterized in that, Of the conductive members located on both sides of the protrusion, one has an extension length of L1 in the first direction and the other has an extension length of L4, wherein L1 > L4.

10. The battery cell according to claim 9, characterized in that, The conductive component is connected and fixed to the protrusion to form a connection area. The extension length of the connection area in the first direction is L3. The extension length of the conductive components located on both sides of the protrusion in the first direction satisfies: L3≤L4<4 / 5*L1.

11. The battery cell according to any one of claims 1 to 10, characterized in that, The conductive member is connected and fixed to the protrusion to form a connection area. The electrode assembly also includes a connecting colloid. Along the first direction, the connecting colloid is disposed on the side of the connection area away from the active material layer. The connecting colloid is connected between the conductive member and the protrusion; or, the connecting colloid is connected between two layers of the conductive member.

12. The battery cell according to claim 11, characterized in that, Along the first direction, the extension length of the connecting colloid is L5, wherein L5 ≥ 3 mm.

13. The battery cell according to claim 11 or 12, characterized in that, Along the first direction, the connecting colloid and the connecting region are successively distributed.

14. The battery cell according to any one of claims 11 to 13, characterized in that, The conductive member is provided on one side of the protrusion in the thickness direction, and the connecting colloid is connected between the conductive member and the protrusion.

15. The battery cell according to any one of claims 11 to 13, characterized in that, The protrusion is provided with conductive members on both sides in the thickness direction, and the protrusion is connected to at least one of the conductive members by the connecting colloid.

16. The battery cell according to any one of claims 11 to 13, characterized in that, The protrusion has conductive members on both sides in the thickness direction. Along the first direction, the extension length of the protrusion is less than the extension length of the conductive member. The protrusion and the conductive members on both sides enclose a receiving cavity. The connecting adhesive is disposed in the receiving cavity, and the connecting adhesive connects the two conductive members.

17. The battery cell according to claim 16, characterized in that, The thickness of the connecting adhesive is less than the thickness of the protrusion.

18. A battery device, characterized in that, Includes the battery cell as described in any one of claims 1 to 16.

19. An electrical appliance, characterized in that, Includes the battery device as described in claim 18.

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