Battery monomer, production equipment and method thereof, battery device and power utilization device

Abstract

The invention provides a battery monomer, production equipment and method thereof, a battery device and a power utilization device. An electrode assembly in the battery monomer comprises a first pole piece and a second pole piece which have opposite polarities and are stacked along the thickness direction of the first pole piece, a first current collector in the first pole piece comprises two first surfaces which are oppositely arranged along the thickness direction and a first end surface which is connected with the two first surfaces; the first surface comprises a coating area and a blank area which are connected with each other, the first end face is connected with the blank areas of the two first surfaces, the first active material layer is arranged in the coating area, the supporting layer is arranged in the blank area, and the first active material layer and the supporting layer are clamped between the first current collector and the second pole piece. The supporting layer arranged in the blank area is clamped between the first current collector and the second pole piece, and the supporting layer can support the second pole piece corresponding to the blank area, so that the possibility that substances in the second pole piece are cracked and broken is reduced, and the reliability of the battery monomer is improved.

Description

Technical Field

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

[0002] Battery devices have the advantages of high specific energy and high power density, and are widely used in electronic devices and transportation vehicles, such as mobile phones, laptops, electric vehicles, electric airplanes, electric ships, and electric tools.

[0003] As the application scope of battery devices continues to expand, people have higher and higher requirements on the reliability of battery devices. How to improve the reliability of battery devices has attracted more and more attention from those skilled in the art. Summary of the invention

[0004] In view of the above problems, the present application provides a battery cell and a production device and method thereof, a battery device, and an electrical device. The battery cell is conducive to improving the reliability of the battery device.

[0005] In a first aspect, the present application provides a battery cell, which includes a shell and an electrode assembly, wherein the electrode assembly is accommodated in the shell, the electrode assembly includes a first pole piece and a second pole piece with opposite polarities, the first pole piece and the second pole piece are stacked along the thickness direction of the first pole piece, the first pole piece includes a first current collector, a first active material layer and a supporting layer, the first current collector includes two first surfaces arranged opposite to each other along the thickness direction and a first end face connecting the two first surfaces; the first surface includes a coating area and a blank area, the blank area is connected between the coating area and the first end face, the first active material layer is arranged in the coating area, the supporting layer is arranged in the blank area, and the first active material layer and the supporting layer are clamped between the first current collector and the second pole piece.

[0006] In the above structure, since the support layer arranged in the blank area is sandwiched between the first current collector and the second pole piece, the support layer can support the second pole piece corresponding to the blank area, reducing the possibility of cracking and breaking of the material in the second pole piece, which is beneficial to improving the reliability of the battery cell.

[0007] According to the battery cell provided in some embodiments of the present application, the surface of the first active material layer facing away from the first surface is flush with the surface of the support layer facing away from the first surface.

[0008] According to the battery cell provided in some embodiments of the present application, the support layer is connected to the outer side of the first active material layer.

[0009] According to the battery cell provided in some embodiments of the present application, the second pole piece includes a second current collector and a second active material layer, the second current collector includes two second surfaces arranged opposite to each other along the thickness direction and a second end face connecting the two second surfaces, and the second active material layer is arranged on the second surface and connected to the second end face.

[0010] According to the battery cell provided in some embodiments of the present application, the first end surface and the second end surface are coplanar.

[0011] According to the battery cell provided in some embodiments of the present application, the first pole piece includes a first pole ear, the first pole ear extends outward from the first end surface in a direction perpendicular to the thickness direction, the blank area includes a first area and a second area, the first area is provided with a support layer, the second area is not provided with a support layer, and the second area is connected to the first pole ear.

[0012] In a second aspect, the present application provides a method for producing a battery monomer, the method comprising: A first pole piece and a second pole piece with opposite polarities are provided, wherein the first pole piece comprises a first current collector, a first active material layer, a support layer and a first pole ear, wherein the first current collector comprises two first surfaces arranged opposite to each other in a thickness direction and a first end face connecting the two first surfaces; the first surface comprises a coating area and a blank area, wherein the blank area is connected between the coating area and the first end face, the first active material layer is arranged in the coating area, and the support layer is arranged in the blank area; the first pole ear extends outward from the first end face in a direction perpendicular to the thickness direction, the blank area comprises a first area and a second area, the first area is provided with a support layer, the second area is not provided with a support layer, and the second area is connected to the first pole ear; The first pole piece and the second pole piece are stacked in a thickness direction to form an electrode assembly; isostatic pressing the electrode assembly; A housing is provided and the electrode assembly is installed in the housing.

[0013] In some embodiments of the present application, the method for producing a battery cell provides a step of providing a first pole piece and a second pole piece with opposite polarities, including: Providing a first pole piece belt and a second pole piece belt with opposite polarities, wherein the first pole piece belt comprises a first current collector and a first active material layer, wherein the first current collector comprises two first surfaces arranged opposite to each other along its thickness direction and a first end surface connecting the two first surfaces, and the first active material layer is arranged on the first surface; Removing part of the first active material layer to form a blank area without the first active material layer and a coating area with the first active material layer on the first surface, wherein the blank area is connected between the coating area and the first end surface; Applying glue to the blank area to form a support layer in the blank area; The first pole piece strip and the second pole piece strip are cut to obtain a first pole piece and a second pole piece.

[0014] According to the production method of the battery monomer provided in some embodiments of the present application, before the step of applying glue to the blank area to form a support layer in the blank area, the method further includes: Check the size of the blank area.

[0015] In a third aspect, the present application provides a battery cell production device, the battery cell production device comprising: A feeding device, used for providing a first pole piece strip, the first pole piece strip comprising a first current collector and a first active material layer, the first current collector comprising two first surfaces arranged opposite to each other along its thickness direction and a first end surface connecting the two first surfaces, and the first active material layer being arranged on the first surface; a cleaning device for cleaning a portion of the first active material layer to form a blank area without the first active material layer and a coating area with the first active material layer on the first surface, wherein the blank area is connected between the coating area and the first end surface; A glue coating device, comprising a glue coating roller, a glue structure is provided on the outer peripheral surface of the glue coating roller, and the glue coating roller is used to roll the first pole piece tape so that the glue structure is bonded to the blank area to form a support layer; The cutting device is used for cutting the first pole piece strip into first pole pieces.

[0016] According to the battery monomer production equipment provided by some embodiments of the present application, two glue coating rollers are provided, and the two glue coating rollers are arranged opposite to each other and respectively roll the two first surfaces arranged opposite to each other.

[0017] According to the battery cell production equipment provided by some embodiments of the present application, the cleaning device includes a laser, and the laser emitted by the laser is used to clean the first active material layer.

[0018] According to the battery cell production equipment provided in some embodiments of the present application, the battery cell production equipment also includes a detection device, and the detection device is used to detect the size of the blank area.

[0019] According to the battery monomer production equipment provided by some embodiments of the present application, the detection equipment includes an image collector, and the image collector is arranged toward the first surface.

[0020] In a second aspect, the present application provides a battery device, which includes a battery cell provided by the above technical solution.

[0021] In a third aspect, the present application provides an electrical device, which includes a battery device provided by the above technical solution, and the battery device is used to provide electrical energy.

[0022] The technical solution provided by the embodiments of the present disclosure brings at least the following beneficial effects: The present application provides a battery cell, which includes a shell and an electrode assembly contained in the shell, wherein the electrode assembly includes a first electrode sheet and a second electrode sheet with opposite polarities and stacked along the thickness direction of the first electrode sheet, the first electrode sheet includes a first current collector, a first active material layer and a support layer, the first current collector includes two first surfaces arranged opposite to each other along the thickness direction and a first end face connecting the two first surfaces; the first surface includes a coating area and a blank area connected to each other, the first end face connects the blank areas of the two first surfaces, the first active material layer is arranged in the coating area, the support layer is arranged in the blank area, and the first active material layer and the support layer are sandwiched between the first current collector and the second electrode sheet. In the above structure, since the support layer arranged in the blank area is sandwiched between the first current collector and the second electrode sheet, the support layer can support the second electrode sheet corresponding to the blank area, reducing the possibility of cracking and breaking of the material in the second electrode sheet, which is conducive to improving the reliability of the battery cell.

[0023] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] By reading the detailed description of the preferred embodiment below, various other advantages and benefits will become clear to those of ordinary skill in the art. The accompanying drawings are only used for the purpose of illustrating the preferred embodiment and are not considered to be limitations of the present application. In addition, the same reference symbols are used to represent the same components throughout the accompanying drawings.

[0025] Figure 1 A schematic diagram of the structure of a vehicle provided in some embodiments of the present application; Figure 2 An exploded view of a battery device provided in some embodiments of the present application; Figure 3 A disassembled diagram of a battery cell provided in some embodiments of the present application; Figure 4 A cross-sectional view of an electrode assembly provided in some embodiments of the present application; Figure 5 A partial structural schematic diagram of a first pole piece provided in some embodiments of the present application; Figure 6 A flow chart of a method for producing a battery cell provided in some embodiments of the present application; Figure 7 A flow chart of obtaining a first pole piece in a method for producing a battery cell provided in some embodiments of the present application; Figure 8A cross-sectional view of a first pole piece strip in a method for producing a battery cell provided in some embodiments of the present application; Fig. 9 A schematic diagram of the structure of a battery cell production device provided in some embodiments of the present application; Fig.10 This is a schematic diagram of the structure of a glue coating roller in a battery cell production device provided in some embodiments of the present application.

[0026] In the attached picture: 1. Vehicle; 2. Battery device; 3. Controller; 4. Motor; 5. Box; 5a. First box part; 5b. Second box part; 5c. Accommodation space; 7. Battery cell; 8. Casing; 9. Electrode assembly; 91. First pole piece; 911. First current collector; 9111. First surface; 9112. Coating area; 9113. Blank area; 9114. First area; 9115. Second area; 9116. First end face; 912. First active material layer; 913. Support layer; 914. First pole ear; 92. Second pole piece; 921. Second current collector; 922. Second active material layer; 10. Feeding device; 101. Cleaning device; 102. Gluing device; 1021. Gluing roller; 1022. Glue structure; 103. Cutting device; 100. First pole piece belt. DETAILED DESCRIPTION

[0027] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0028] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in the embodiments of the present application should have the common meanings understood by technicians in the field to which the embodiments of the present application belong.

[0029] In the description of the embodiments of the present application, the orientations or positional relationships indicated by technical terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", and "circumferential" are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0030] In addition, the technical terms "first", "second", etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two (including two), unless otherwise clearly and specifically defined.

[0031] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like 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 mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0032] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0033] At present, from the perspective of market development, the application of battery devices is becoming more and more extensive. Battery devices are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields.

[0034] The battery device mentioned in the embodiments of the present application refers to a single physical module including one or more battery cell assemblies to provide higher voltage and capacity. The battery cell assembly may include multiple battery cells, which are connected in series, in parallel or in mixed connection through a busbar.

[0035] As an example, the battery cell assembly may be a battery module, which is formed by arranging and fixing a plurality of battery cells to form an independent module. As an example, the battery module may be formed by bundling a plurality of battery cells by a cable tie.

[0036] The battery cell may be a secondary battery cell, which refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0037] The battery cells can be lithium-ion battery cells, sodium-ion battery cells, sodium-lithium-ion battery cells, lithium metal battery cells, sodium metal battery cells, lithium-sulfur battery cells, magnesium-ion battery cells, nickel-hydrogen battery cells, nickel-cadmium battery cells, lead-acid battery cells, etc.

[0038] 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 prevent the positive and negative electrodes from short-circuiting, while allowing active ions to pass through.

[0039] 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.

[0040] 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.

[0041] As an example, the positive electrode current collector may be a metal foil, a conductive polymer material, a carbon material or a composite current collector. For example, as the metal foil, a pure metal, an alloy, a surface-treated metal, including but not limited to stainless steel, copper, aluminum, nickel, titanium or silver, etc., may be used. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector may be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0042] As an example, the positive electrode active material may include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides, and their respective modified compounds. However, the present application is not limited to these materials, and other traditional materials that can be used as positive electrode active materials for batteries may also be used. These positive electrode active materials may be used alone or in combination of two or more. Among them, examples of lithium-containing phosphates may include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO4), a composite material of lithium manganese phosphate and carbon, lithium iron manganese phosphate, and a composite material of lithium iron manganese phosphate and carbon. Examples of lithium transition metal oxides may include, but are not limited to, lithium cobalt oxide (such as LiCoO2), lithium nickel oxide (such as LiNiO2), lithium manganese oxide (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide (such as LiNi 1 / 3 Co 1 / 3Mn 1 / 3 O2 (also referred to as NCM 333 )、LiNi 0.5 Co 0.2 Mn 0.3 O2 (also referred to as NCM 523 )、LiNi 0.5 Co 0.25 Mn 0.25 O2 (also referred to as NCM 211 )、LiNi 0.6 Co 0.2 Mn 0.2 O2 (also referred to as NCM 622 )、LiNi 0.8 Co 0.1 Mn 0.1 O2 (also referred to as NCM 811 ), lithium nickel cobalt aluminum oxide (such as LiNi 0.8 Co 0.15 Al 0.05 O2) and at least one of its modified compounds. The modified compound refers to a substance obtained by modifying the above substances by means of doping or coating.

[0043] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0044] As an example, the negative electrode current collector may be a metal foil, a conductive polymer material, a carbon material or a composite current collector. For example, as the metal foil, a pure metal, an alloy, a surface-treated metal, including but not limited to stainless steel, copper, aluminum, nickel, nickel, titanium or silver, etc., may be used. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector may be formed by forming a metal material (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.).

[0045] 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.

[0046] 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.

[0047] 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 battery cells may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0048] In some embodiments, the negative electrode may be a foam metal. The foam metal may be foam nickel, foam copper, foam aluminum, foam alloy, or foam carbon, etc. When the foam metal is used as the negative electrode sheet, the surface of the foam metal may not be provided with a negative electrode active material, but of course, a negative electrode active material may also be provided.

[0049] As an example, a negative electrode active material may be filled and / or deposited in the negative electrode current collector.

[0050] 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.

[0051] The separator is disposed between the positive electrode and the negative electrode.

[0052] In some embodiments, the separator is a separator. The present application has no particular limitation on the type of separator, and any known separator with a porous structure having good chemical stability and mechanical stability can be selected.

[0053] As an example, the main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic. The separator can be a single-layer film or a multi-layer composite film, without special restrictions. When the separator is a multi-layer composite film, the materials of each layer can be the same or different, without special restrictions. The separator can be a separate component located between the positive and negative electrodes, or it can be attached to the surface of the positive and negative electrodes. An inorganic particle coating, an organic particle coating, or an organic / inorganic composite coating can also be coated on the surface of the separator.

[0054] In some embodiments, the separator is a solid electrolyte, which is disposed between the positive electrode and the negative electrode and serves to transmit ions and isolate the positive and negative electrodes.

[0055] In some embodiments, the battery cell further includes an electrolyte, which plays a role in conducting ions between the positive and negative electrodes. The present application has no specific restrictions on the type of electrolyte, which can be selected according to needs. The electrolyte can be solid.

[0056] The solid electrolyte may include a polymer solid electrolyte, an inorganic solid electrolyte, and a composite solid electrolyte.

[0057] As examples, the polymer of the polymer solid electrolyte may include polyether (polyethylene oxide), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, a single ion polymer, a polyionic liquid, cellulose, and the like.

[0058] As an example, the inorganic solid electrolyte can be an oxide solid electrolyte (crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous LiPON film), a sulfide solid electrolyte (crystalline lithium superion conductor (lithium germanium phosphosulfide, silver germanium sulfide), amorphous sulfide) and one or more of a halide solid electrolyte, a nitride solid electrolyte and a hydride solid electrolyte.

[0059] As an example, the composite solid electrolyte is formed by adding an inorganic solid electrolyte filler to a polymer solid electrolyte.

[0060] The electrode assembly may be a laminated structure. 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.

[0061] As an example, a plurality of positive electrode sheets may be provided, and the negative electrode sheet may be folded to form a plurality of stacked folded segments, with a positive electrode sheet being sandwiched between adjacent folded segments.

[0062] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form a plurality of folded sections that are stacked.

[0063] 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.

[0064] As an example, the separator may be disposed continuously and disposed between any adjacent positive electrode sheets or negative electrode sheets by folding.

[0065] In some embodiments, the shape of the electrode assembly can be flat or polygonal.

[0066] In some embodiments, the electrode assembly is provided with tabs, which can lead current out of the electrode assembly. The tabs include a positive tab and a negative tab.

[0067] In a battery cell, the area of ​​the negative electrode plate is usually larger than that of the positive electrode plate. However, in a stacked solid-state battery cell, due to the isostatic pressing process required for the solid-state battery cell, the electrode assembly after stacking will be subjected to high pressure, and the negative electrode plate is prone to breakage or disconnection where it exceeds the positive electrode plate, affecting the reliability of the battery cell.

[0068] In order to improve the reliability of a battery cell, the present application provides a battery cell, which includes a shell and an electrode assembly contained in the shell, the electrode assembly includes a first electrode sheet and a second electrode sheet with opposite polarities and stacked along the thickness direction of the first electrode sheet, the first electrode sheet includes a first current collector, a first active material layer and a support layer, the first current collector includes two first surfaces arranged oppositely along the thickness direction and a first end face connecting the two first surfaces; the first surface includes a coating area and a blank area connected to each other, the blank area is connected between the coating area and the first end face, the first active material layer is arranged in the coating area, the support layer is arranged in the blank area, and the first active material layer and the support layer are sandwiched between the first current collector and the second electrode sheet. In the above structure, since the support layer arranged in the blank area is sandwiched between the first current collector and the second electrode sheet, the support layer can support the second electrode sheet corresponding to the blank area, reducing the possibility of cracking and breaking of the material in the second electrode sheet, which is conducive to improving the reliability of the battery cell.

[0069] The battery cell described in the embodiment of the present application is applicable to a battery device and an electric device using the battery device. The battery device disclosed in the embodiment of the present application can be used in an electric device using the battery device as a power source or in various energy storage systems using the battery device as an energy storage element.

[0070] Electrical devices may be vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, electric tools, etc. Vehicles may be fuel vehicles, gas vehicles or new energy vehicles, and new energy vehicles may be pure electric vehicles, hybrid vehicles or extended-range vehicles, etc. Spacecraft include aircraft, 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.

[0071] For the convenience of description, the following embodiments are described by taking a vehicle as an example of an electrical device in an embodiment of the present application.

[0072] Figure 1 A schematic diagram of the structure of a vehicle provided for some embodiments of the present application.

[0073] like Figure 1 As shown, a battery device 2 is disposed inside the vehicle 1, and the battery device 2 may be disposed at the bottom, head, or tail of the vehicle 1. The battery device 2 may be used to power the vehicle 1, for example, the battery device 2 may be used as an operating power source for the vehicle 1.

[0074] The vehicle 1 may further include a controller 3 and a motor 4 , wherein the controller 3 is used to control the battery device 2 to supply power to the motor 4 , for example, to meet the power requirements of starting, navigating and driving the vehicle 1 .

[0075] In some embodiments of the present application, the battery device 2 can not only serve as an operating power source for the vehicle 1, but also serve as a driving power source for the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0076] Figure 2 This is a schematic diagram of the disassembled structure of a battery device provided in some embodiments of the present application. Figure 2 As shown, the battery device 2 includes a housing 5 and a battery cell 7, and the battery cell 7 is accommodated in the housing 5. The battery cell 7 may be the smallest unit constituting the battery.

[0077] The box 5 is used to accommodate the battery cell 7, and the box 5 can be of various structures. In some embodiments, the box 5 can include a first box portion 5a and a second box portion 5b, the first box portion 5a and the second box portion 5b cover each other, and the first box portion 5a and the second box portion 5b jointly define a storage space 5c for accommodating the battery cell 7. The second box portion 5b can be a hollow structure with one end open, the first box portion 5a is a plate-like structure, and the first box portion 5a covers the open side of the second box portion 5b to form a box 5 with a storage space 5c; the first box portion 5a and the second box portion 5b can also be hollow structures with one side open, and the open side of the first box portion 5a covers the open side of the second box portion 5b to form a box 5 with a storage space 5c. Of course, the first box portion 5a and the second box portion 5b can be of various shapes, such as a cylinder, a cuboid, etc.

[0078] In order to improve the sealing performance after the first box body part 5a and the second box body part 5b are connected, a sealing member, such as a sealant, a sealing ring, etc., may also be provided between the first box body part 5a and the second box body part 5b.

[0079] Assuming that the first box body portion 5a covers the top of the second box body portion 5b, the first box body portion 5a can also be called an upper box cover, and the second box body portion 5b can also be called a lower box.

[0080] In the battery device 2, the battery cell 7 can be one or more. If there are more than one battery cell 7, the battery cells 7 can be connected in series, in parallel or in mixed connection. Mixed connection means that the battery cells 7 are both connected in series and in parallel. The battery cells 7 can be directly connected in series, in parallel or in mixed connection, and then the whole formed by the battery cells 7 can be accommodated in the box 5; of course, the battery cells 7 can also be connected in series, in parallel or in mixed connection to form a battery module, and then the battery modules can be connected in series, in parallel or in mixed connection to form a whole, and then accommodated in the box 5.

[0081] The battery cell 7 may be a square battery cell or a battery cell of other shapes.

[0082] Some embodiments of the present application provide a battery cell 7, referring to Figure 3 The battery cell 7 includes a housing 8 and an electrode assembly 9, wherein the electrode assembly 9 is accommodated in the housing 8. Figure 4 The electrode assembly 9 includes a first electrode sheet 91 and a second electrode sheet 92 with opposite polarities, and the first electrode sheet 91 and the second electrode sheet 92 are stacked along the thickness direction of the first electrode sheet 91. The first electrode sheet 91 includes a first current collector 911, a first active material layer 912 and a support layer 913. The first current collector 911 includes two first surfaces 9111 arranged opposite to each other along the thickness direction and a first end face 9116 connecting the two first surfaces 9111; the first surface 9111 includes a coating area 9112 and a blank area 9113, and the blank area 9113 is connected between the coating area 9112 and the first end face 9116. The first active material layer 912 is arranged in the coating area 9112, and the support layer 913 is arranged in the blank area 9113. The first active material layer 912 and the support layer 913 are clamped between the first current collector 911 and the second electrode sheet 92.

[0083] The shell 8 can be in various shapes and sizes, such as a rectangular parallelepiped, a hexagonal prism, etc. Specifically, the shape of the shell 8 can be determined according to the specific shape and size of the electrode assembly 9. The shell 8 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, etc. The electrode assembly 9 is a component in the battery cell 7 where an electrochemical reaction occurs. One or more electrode assemblies 9 can be contained in the shell 8.

[0084] The first pole piece 91 and the second pole piece 92 are two pole pieces with opposite polarities in the electrode assembly 9 . The first pole piece 91 and the second pole piece 92 can be stacked along the thickness direction of the first pole piece 91 , so that the electrode assembly 9 is a stacked structure.

[0085] The first current collector 911 may be a matrix structure in the first pole piece 91, which serves as a carrier for setting the first active material layer 912 and other structural layers. The first surface 9111 is two surfaces of the first current collector 911 that are relatively spaced apart in the thickness direction, and the material of the first current collector 911 is set between the two relatively set first surfaces 9111. The first end surface 9116 is a surface connecting the two first surfaces 9111, which is arranged around the periphery of the first current collector 911.

[0086] The coating area 9112 and the blank area 9113 are different areas connected to each other in the first surface 9111, wherein the coating area 9112 is an area of ​​the first surface 9111 provided with the first active material layer 912, and the blank area 9113 is an area of ​​the first surface 9111 not provided with the first active material layer 912. By connecting the blank area 9113 between the coating area 9112 and the first end face 9116, the blank area 9113 is provided at the edge of the first pole piece 91. Since the blank area 9113 is not provided with the first active material layer 912, the projection area of ​​the area of ​​the second pole piece 92 provided with the active material material in the thickness direction is larger than the projection area of ​​the area of ​​the first pole piece 91 provided with the first active material layer 912 in the thickness direction, thereby meeting the design process requirements of the battery cell 7.

[0087] The first active material layer 912 is a structural layer including polar active materials, which can be formed on the coating area 9112 of the first surface 9111 by a coating process. The first active material layer 912 is disposed on the first surface 9111, and the first active material layer 912 can be disposed on both coating areas 9112 of the two first surfaces 9111, or one of the two first surfaces 9111 can be disposed with the first active material layer 912.

[0088] Since the blank area 9113 is not provided with the first active material layer 912, after the first pole piece 91 and the second pole piece 92 are stacked, the area corresponding to the blank area 9113 is prone to form a gap. Under the action of the pressure in the thickness direction, the second pole piece 92 corresponding to the blank area 9113 is prone to stress concentration, and the material thereon is prone to break. The support layer 913 can be a structural layer provided on the blank area 9113, which is sandwiched between the first current collector 911 and the second pole piece 92 with the first active material layer 912, and can support the first current collector 911 and the second pole piece 92 on both sides, reduce the possibility of forming a gap, and make the second pole piece 92 corresponding to the blank area 9113 less prone to stress concentration, which is conducive to reducing the possibility of cracking and breaking of the material in the second pole piece 92.

[0089] Since the support layer 913 is a structural layer that plays a supporting role, it is used to apply a force to the second pole piece 92 and the first current collector 911, and the support layer 913 is made of a material that does not react with the first pole piece 91 and the second pole piece 92. Exemplarily, the support layer 913 is made of an adhesive material with adhesive properties, so that the support layer 913 can be firmly connected to the first current collector 911.

[0090] In the above structure, since the support layer 913 arranged in the blank area 9113 is sandwiched between the first current collector 911 and the second pole piece 92, the support layer 913 can support the second pole piece 92 corresponding to the blank area 9113, reducing the possibility of cracking and breaking of the material in the second pole piece 92, which is beneficial to improving the reliability of the battery cell 7.

[0091] In some embodiments, a surface of the first active material layer 912 facing away from the first surface 9111 is flush with a surface of the support layer 913 facing away from the first surface 9111 .

[0092] The surface of the first active material layer 912 facing away from the first surface 9111 is flush with the surface of the support layer 913 facing away from the first surface 9111 , which may mean that the surface of the first active material layer 912 facing away from the first surface 9111 is coplanar with the surface of the support layer 913 facing away from the first surface 9111 .

[0093] By arranging the surface of the first active material layer 912 facing away from the first surface 9111 flush with the surface of the support layer 913 facing away from the first surface 9111, there is no height difference between the surface of the first active material layer 912 facing away from the first surface 9111 and the surface of the support layer 913 facing away from the first surface 9111, thereby reducing the possibility of a gap between the second electrode piece 92 and the second electrode piece 92 corresponding to the first active material layer 912 and the second electrode piece 92 corresponding to the support layer 913 are subjected to force synchronously, which is beneficial to reducing the possibility of stress concentration on the second electrode piece 92 and reducing the possibility of cracking and breakage of the material in the second electrode piece 92.

[0094] In some embodiments, the support layer 913 is connected to the outer side of the first active material layer 912 .

[0095] The support layer 913 is connected to the outer side of the first active material layer 912, which may mean that the support layer 913 is arranged around the outer side of the first active material layer 912 and connected to the outer peripheral surface of the first active material layer 912, which not only enables the support layer 913 to support the area around the first active material layer 912 corresponding to the blank area 9113, but also enables the support layer 913 to be more firmly connected to the first electrode 91, and also reduces the possibility of gaps between the support layer 913 and the first active material layer 912, which helps to reduce the possibility of stress concentration on the second electrode 92.

[0096] In some embodiments, the second electrode plate 92 includes a second current collector 921 and a second active material layer 922. The second current collector 921 includes two second surfaces arranged opposite to each other along the thickness direction and a second end face connecting the two second surfaces. The second active material layer 922 is arranged on the second surface and connected to the second end face.

[0097] The second current collector 921 may be a matrix structure in the second pole piece 92, which serves as a carrier for setting the second active material layer 922 and other structural layers. The second surface is two surfaces of the second current collector 921 that are relatively spaced apart in the thickness direction, and the material of the second current collector 921 is set between the two relatively set second surfaces. The second end surface is a surface connecting the two second surfaces, which is arranged around the periphery of the second current collector 921.

[0098] The second active material layer 922 is a structural layer including a polar active material, which can be formed on the second surface of the second current collector 921 through a coating process. The second active material layer 922 is disposed on the second surface, and the second active material layer 922 may be disposed on both second surfaces of the second current collector 921, or on one of the two second surfaces of the second current collector 921.

[0099] By connecting the second active material layer 922 to the second end face, the second active material layer 922 can cover the entire second surface, so that the projection area of ​​the second active material layer 922 in the thickness direction can be more easily larger than the projection area of ​​the first active material layer 912 in the thickness direction, thereby meeting the design process requirements of the battery cell 7.

[0100] In some embodiments, the first end face 9116 and the second end face are coplanar.

[0101] The first end face 9116 and the second end face being coplanar may mean that the planes where the first end face 9116 and the second end face are located coincide with each other, so that the edge of the first pole piece 91 and the edge of the second pole piece 92 are flush, so that the electrode assembly 9 formed by the first pole piece 91 and the second pole piece 92 has a neat structure.

[0102] In some embodiments, reference Figure 5 The first pole piece 91 includes a first pole ear 914, which extends outward from the first end surface 9116 in a direction perpendicular to the thickness direction. The blank area 9113 includes a first area 9114 and a second area 9115. The first area 9114 is provided with a support layer 913, and the second area 9115 is not provided with a support layer 913. The second area 9115 is connected to the first pole ear 914.

[0103] The first pole tab 914 may be a structure for the first pole piece 91 to lead out current. By arranging the first pole tab 914 to extend outward in a direction perpendicular to the thickness direction, the first pole tab 914 can smoothly lead out current.

[0104] The first area 9114 and the second area 9115 are two connected parts in the blank area 9113, wherein the second area 9115 is connected to the first pole lug 914, and the first area 9114 is not connected to the first pole piece 91. By providing the support layer 913 in the first area 9114, but not on the support layer 913 in the second area 9115, the possibility of adhesion between the material in the support layer 913 and the first pole lug 914 is reduced, which is conducive to maintaining the original structural state of the first pole lug 914 and improving the reliability of the battery cell 7.

[0105] Some embodiments of the present application also provide a method for producing a battery cell 7, referring to Figure 6 The production method of the battery cell 7 comprises the following steps: S1. Provide a first pole piece 91 and a second pole piece 92 with opposite polarities. The first pole piece 91 includes a first current collector 911, a first active material layer 912, a support layer 913 and a first pole ear 914. The first current collector 911 includes two first surfaces 9111 arranged opposite to each other in the thickness direction and a first end face 9116 connecting the two first surfaces 9111. The first surface 9111 includes a coating area 9112 and a blank area 9113. The blank area 9113 is connected to the coating area 9112. 112 and the first end face 9116, the first active material layer 912 is arranged in the coating area 9112, the support layer 913 is arranged in the blank area 9113, the first pole ear 914 extends outward from the first end face 9116 in a direction perpendicular to the thickness direction, the blank area 9113 includes a first area 9114 and a second area 9115, the first area 9114 is provided with the support layer 913, the second area 9115 is not provided with the support layer 913, and the second area 9115 is connected to the first pole ear 914.

[0106] By providing the first pole piece 91 and the second pole piece 92 with opposite polarities as mentioned in the above technical solution. The first pole piece 91 includes a first current collector 911, a first active material layer 912 and a support layer 913, and the support layer 913 and the first active material layer 912 are respectively arranged in the coating area 9112 and the blank area 9113 of the first surface 9111. Since the blank area 9113 is connected between the coating area 9112 and the first end face 9116, the support layer 913 is arranged at the edge position of the first current collector 911, so that when the first pole piece 91 and the second pole piece 92 are stacked later, the support layer 913 and the first active material layer 912 can cover the entire surface of the second pole piece 92 in the thickness direction, thereby supporting the second pole piece 92.

[0107] S2. Stack the first pole piece 91 and the second pole piece 92 in the thickness direction to form an electrode assembly 9.

[0108] In the above steps, the first pole pieces 91 and the second pole pieces 92 are stacked in the thickness direction so that the alternately stacked first pole pieces 91 and the second pole pieces 92 can form a laminated electrode assembly 9 .

[0109] S3. Perform isostatic pressing on the electrode assembly 9.

[0110] In step S3 , the electrode assembly 9 formed by laminating the first pole piece 91 and the second pole piece 92 is subjected to isostatic pressing, so that the electrode assembly 9 can obtain better electrical performance.

[0111] The isostatic pressing treatment of the electrode assembly 9 may refer to placing the electrode assembly 9 in a closed high-pressure container, and using the medium (liquid or gas) in the container to evenly apply ultra-high pressure to the electrode assembly 9 in all directions, so that the electrode assembly 9 can be better formed and the electrode assembly 9 can obtain better electrical properties.

[0112] S4. Provide a housing 8 and install the electrode assembly 9 into the housing 8.

[0113] In step S4 , after providing the outer shell 8 of the battery cell 7 , the electrode assembly 9 is installed in the outer shell 8 so that the electrode assembly 9 is placed in a sealed space, thereby forming the battery cell 7 .

[0114] In some embodiments, reference Figure 7 The step of providing a first pole piece 91 and a second pole piece 92 with opposite polarities comprises the following steps: S11, providing a first pole piece belt 100 and a second pole piece belt with opposite polarities, refer to Figure 8 The first electrode strip 100 includes a first current collector 911 and a first active material layer 912 . The first current collector 911 includes two first surfaces 9111 arranged opposite to each other along its thickness direction and a first end surface 9116 connecting the two first surfaces 9111 . The first active material layer 912 is arranged on the first surface 9111 .

[0115] In the above step S11, the first pole piece tape 100 and the second pole piece tape provided may be a continuous structure in the form of a strip, the first pole piece tape 100 may be cut into a plurality of first pole pieces 91, and the second pole piece tape may be cut into a plurality of second pole pieces 92. Exemplarily, the first pole piece tape 100 and the second pole piece tape may be wound into a roll-shaped structure, which is beneficial to reducing the space occupied by the first pole piece tape 100 and the second pole piece tape.

[0116] The first current collector 911 may be a matrix structure in which the first active material layer 912 and other structural layers are disposed in the first pole piece strip 100. The first current collector 911 in the first pole piece strip 100 may be disposed continuously along the extension direction of the first pole piece strip 100, and the first surface 9111 thereon is two surfaces disposed relatively spaced apart in the thickness direction, which are used to dispose the first active material layer 912 and the supporting layer 913 and other structural layers.

[0117] S12, partially removing the first active material layer 912 to form a blank area 9113 without the first active material layer 912 and a coating area 9112 with the first active material layer 912 on the first surface 9111, wherein the blank area 9113 is connected between the coating area 9112 and the first end surface 9116.

[0118] In the above step S12, a portion of the first active material layer 912 is removed, so that a blank area 9113 without the first active material layer 912 is formed on the first surface 9111. The blank area 9113 is connected between the coating area 9112 and the first end surface 9116, so that the blank area 9113 surrounds the outer periphery of the coating area 9112 and is located at the edge of the first pole piece 91.

[0119] For example, the first active material layer 912 may be removed by using a laser. Since the laser has high energy, the first active material layer 912 can be removed by using a laser with high efficiency.

[0120] S13 , applying glue to the blank area 9113 to form a support layer 913 in the blank area 9113 .

[0121] In the above step S13 , applying glue to the blank area 9113 may refer to coating the molding material of the support layer 913 in the blank area 9113 , so that the molding material of the support layer 913 forms the support layer 913 covering the blank area 9113 after solidification.

[0122] S14 , cutting the first pole piece strip 100 and the second pole piece strip to obtain the first pole piece 91 and the second pole piece 92 .

[0123] In the above step S14, the first electrode sheet tape 100 and the second electrode sheet tape are cut into a plurality of first electrode sheets 91 and a plurality of second electrode sheets 92 so as to obtain a first electrode sheet 91 having a first current collector 911, a first active material layer 912 and a support layer 913.

[0124] Through the above steps S11 , S12 , S13 and S14 , a sheet-shaped first pole piece 91 and a sheet-shaped second pole piece 92 are obtained, so that the electrode assembly 9 can be obtained later by alternately stacking the first pole piece 91 and the second pole piece 92 .

[0125] In some embodiments, before the step of applying glue to the blank area 9113 to form the support layer 913 in the blank area 9113, the following steps are also included: S131, detect the size of the blank area 9113.

[0126] Detecting the size of the blank area 9113 may refer to detecting the size of the blank area 9113 formed after removing the first active material layer 912, so that the blank area 9113 meets the size requirements for setting the support layer 913, which is beneficial to reducing the defects caused by removing too little or too much of the first active material layer 912.

[0127] Exemplarily, an image collector may be used to collect an image of the blank area 9113, and then the collected image may be processed to obtain the size information of the blank area 9113. Exemplarily, the image collector may include a charge coupled device (CCD), which has the advantages of high sensitivity, strong light resistance, and small distortion, and is conducive to improving the quality of the image of the blank area 9113 obtained, and is conducive to improving the accuracy of the size information of the blank area 9113.

[0128] Some embodiments of the present application also provide a production device for a battery cell 7, referring to Fig. 9 The production equipment of the battery cell 7 includes a feeding device 10, a cleaning device 101, a glue coating device 102 and a cutting device 103. The feeding device 10 is used to provide a first pole piece strip 100. The first pole piece strip 100 includes a first current collector 911 and a first active material layer 912. The first current collector 911 includes two first surfaces 9111 arranged opposite to each other along its thickness direction and a first end face 9116 connecting the two first surfaces 9111. The first active material layer 912 is arranged on the first surface 9111. The cleaning device 101 is used to remove part of the first active material layer 912 to form a blank area 9113 without the first active material layer 912 and a coating area 9112 with the first active material layer 912 on the first surface 9111. The blank area 9113 is connected between the coating area 9112 and the first end face 9116. The glue coating device 102 includes a glue coating roller 1021. Fig.10 As shown, a glue structure 1022 is provided on the outer peripheral surface of the glue coating roller 1021, and the glue coating roller 1021 is used to roll the first pole piece tape 100 so that the glue structure 1022 adheres to the blank area 9113 to form a supporting layer 913; the cutting device 103 is used to cut the first pole piece tape 100 into the first pole piece 91.

[0129] The feeding device 10 may be a device for providing the first electrode strip 100, which can continuously provide the first electrode strip 100. As in the above technical solution, the first electrode strip 100 provided by the feeding device 10 includes a first current collector 911 and a first active material layer 912, the first current collector 911 includes two first surfaces 9111 arranged opposite to each other along its thickness direction and a first end surface 9116 connecting the two first surfaces 9111, and the first active material layer 912 is arranged on the first surface 9111.

[0130] Exemplarily, the first electrode tape 100 is wound, and the feeding device 10 may include a reel, on which the first electrode tape 100 is wound, and the reel can unwind the first electrode tape 100 by rotating.

[0131] The cleaning device 101 may be a device for cleaning the first active material layer 912. The cleaning device 101 is used to clean a portion of the first active material layer 912, so that a blank area 9113 without the first active material layer 912 and a coating area 9112 with the first active material layer 912 are formed on the first surface 9111 of the first electrode strip 100.

[0132] The blank area 9113 is formed at the edge portion of the first pole piece strip 100 by connecting the blank area 9113 between the coated area 9112 and the first end surface 9116 .

[0133] The glue coating device 102 may be a device for coating the glue structure 1022 in the blank area 9113 . By coating the glue structure 1022 in the blank area 9113 , the glue structure 1022 is cured to form a support layer 913 disposed on the blank area 9113 .

[0134] The glue coating roller 1021 is a roller in the glue coating device 102, and is used to roll the first pole piece tape 100. By providing a glue structure 1022 on the outer peripheral surface of the glue coating roller 1021, the glue coating roller 1021 can adhere the glue structure 1022 to the blank area 9113 during the process of rolling the first pole piece tape 100, so that the glue structure 1022 forms a support layer 913 later.

[0135] The cutting device 103 may be a device for cutting the first pole piece tape 100. The first pole piece tape 100 is cut by the cutting device 103 so that the first pole piece tape 100 can be cut into a plurality of first pole pieces 91, which is convenient for subsequent lamination.

[0136] In some embodiments, two glue coating rollers 1021 are provided, and the two glue coating rollers 1021 are arranged opposite to each other and respectively roll the two first surfaces 9111 arranged opposite to each other.

[0137] By setting two oppositely disposed glue coating rollers 1021, the first pole piece tape 100 passes between the two glue coating rollers 1021. The two glue coating rollers 1021 can respectively roll the two oppositely disposed first surfaces 9111, so that the glue structure 1022 on the glue coating rollers 1021 can adhere to the blank area 9113 of the first surface 9111.

[0138] In some embodiments, the cleaning device 101 includes a laser, and the laser emitted by the laser is used to clean the first active material layer 912 .

[0139] By making the cleaning device 101 include a laser, the laser light emitted by the laser cleans the first active material layer 912 , so that the cleaning device 101 can clean the first active material layer 912 in the blank area 9113 with high efficiency.

[0140] In some embodiments, the production equipment of the battery cell 7 further includes a detection equipment, and the detection equipment is used to detect the size of the blank area 9113 .

[0141] The detection device can be a device for detecting the size of the blank area 9113. By using the detection device to detect the size of the blank area 9113, the size of the blank area 9113 formed by clearing the first active material layer 912 can be well controlled, which is beneficial to improving the quality of the formed electrode assembly 9.

[0142] In some embodiments, the detection device includes an image collector, which is disposed toward the first surface 9111 .

[0143] The image collector may be a device for collecting images of the blank area 9113, which is disposed toward the first surface 9111 and is capable of collecting image information of the blank area 9113. Exemplarily, the image collector may include a charge coupled device (CCD), which has the advantages of high sensitivity, strong light resistance, and small distortion, and is conducive to improving the quality of the image of the blank area 9113 obtained, and is conducive to improving the accuracy of obtaining the size information of the blank area 9113.

[0144] Some embodiments of the present application further provide a battery device 2, which includes a battery cell 7 provided by the above technical solution.

[0145] Some embodiments of the present application further provide an electrical device, which includes the battery device 2 provided by the above technical solution, and the battery device 2 is used to provide electrical energy.

[0146] Some embodiments of the present application provide a battery cell 7, which includes a shell 8 and an electrode assembly 9 accommodated in the shell 8, the electrode assembly 9 includes a first pole piece 91 and a second pole piece 92 with opposite polarities and stacked along the thickness direction of the first pole piece 91, the first pole piece 91 includes a first current collector 911, a first active material layer 912 and a support layer 913, the first current collector 911 includes two first surfaces 9111 arranged opposite to each other along the thickness direction and a first end face 9116 connecting the two first surfaces 9111; the first surface 9111 includes a coating area 9112 and a blank area 9113 connected to each other, the first end face 9116 connects the blank areas 9113 of the two first surfaces 9111, the first active material layer 912 is arranged in the coating area 9112, the support layer 913 is arranged in the blank area 9113, and the first active material layer 912 and the support layer 913 are clamped between the first current collector 911 and the second pole piece 92. The second region 9115 in the blank region 9113 is connected to the first electrode tab 914 extending from the first end surface 9116 .

[0147] In the above structure, since the support layer 913 arranged in the blank area 9113 is sandwiched between the first current collector 911 and the second pole piece 92, the support layer 913 can support the second pole piece 92 corresponding to the blank area 9113, reducing the possibility of cracking and breaking of the material in the second pole piece 92, which is beneficial to improving the reliability of the battery cell 7.

[0148] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery cell, characterized in that: include: shell; an electrode assembly, contained in the housing, the electrode assembly comprising a first pole piece and a second pole piece with opposite polarities, the first pole piece and the second pole piece being stacked along a thickness direction of the first pole piece, the first pole piece comprising a first current collector, a first active material layer, a support layer and a first pole ear, the first current collector comprising two first surfaces arranged opposite to each other along the thickness direction and a first end surface connecting the two first surfaces; The first surface includes a coating area and a blank area, the blank area is connected between the coating area and the first end face, the first active material layer is arranged in the coating area, the support layer is arranged in the blank area, and the first active material layer and the support layer are clamped between the first current collector and the second pole piece; the first pole ear extends outward from the first end face in a direction perpendicular to the thickness direction, the blank area includes a first area and a second area, the first area is provided with the support layer, the second area is not provided with the support layer, and the second area is connected to the first pole ear.

2. The battery cell according to claim 1, characterized in that: A surface of the first active material layer facing away from the first surface is flush with a surface of the support layer facing away from the first surface.

3. The battery cell according to claim 1, characterized in that: The supporting layer is connected to the outer side of the first active material layer.

4. The battery cell according to claim 1, characterized in that: The second pole piece includes a second current collector and a second active material layer. The second current collector includes two second surfaces arranged opposite to each other along the thickness direction and a second end surface connecting the two second surfaces. The second active material layer is arranged on the second surface and connected to the second end surface.

5. The battery cell according to claim 4, characterized in that: The first end surface and the second end surface are coplanar.

6. A method for producing a battery cell, characterized in that: include: A first pole piece and a second pole piece with opposite polarities are provided, wherein the first pole piece comprises a first current collector, a first active material layer, a support layer and a first pole ear, wherein the first current collector comprises two first surfaces arranged opposite to each other in a thickness direction and a first end face connecting the two first surfaces; the first surface comprises a coating area and a blank area, wherein the blank area is connected between the coating area and the first end face, the first active material layer is arranged in the coating area, and the support layer is arranged in the blank area; the first pole ear extends outward from the first end face in a direction perpendicular to the thickness direction, the blank area comprises a first area and a second area, the first area is provided with the support layer, the second area is not provided with the support layer, and the second area is connected to the first pole ear; The first pole piece and the second pole piece are stacked in the thickness direction to form an electrode assembly; performing isostatic pressing on the electrode assembly; A housing is provided and the electrode assembly is housed in the housing.

7. The method for producing a battery cell according to claim 6, characterized in that: The step of providing a first pole piece and a second pole piece with opposite polarities comprises: Providing a first pole piece belt and a second pole piece belt with opposite polarities, wherein the first pole piece belt comprises a first current collector and a first active material layer, wherein the first current collector comprises two first surfaces arranged opposite to each other along its thickness direction and a first end surface connecting the two first surfaces, and the first active material layer is arranged on the first surface; removing a portion of the first active material layer to form a blank area without the first active material layer and a coating area with the first active material layer on the first surface, wherein the blank area is connected between the coating area and the first end surface; Applying glue to the blank area to form a support layer in the blank area; The first pole piece strip and the second pole piece strip are cut to obtain the first pole piece and the second pole piece.

8. The method for producing a battery cell according to claim 6, characterized in that: Before the step of applying glue to the blank area to form a support layer in the blank area, the method further includes: The size of the blank area is detected.

9. A battery cell production device, characterized in that: include: A feeding device, used for providing a first pole piece strip, wherein the first pole piece strip comprises a first current collector and a first active material layer, wherein the first current collector comprises two first surfaces arranged opposite to each other along its thickness direction and a first end surface connecting the two first surfaces, and the first active material layer is arranged on the first surface; a cleaning device for cleaning a portion of the first active material layer to form a blank area without the first active material layer and a coating area with the first active material layer on the first surface, wherein the blank area is connected between the coating area and the first end surface; A glue coating device, comprising a glue coating roller, a glue structure is provided on the outer peripheral surface of the glue coating roller, and the glue coating roller is used to roll the first pole piece tape so that the glue structure adheres to the blank area to form a support layer; A cutting device is used for cutting the first pole piece strip into first pole pieces.

10. The battery cell production equipment according to claim 9, characterized in that: There are two glue coating rollers, which are arranged opposite to each other and respectively roll the two first surfaces arranged opposite to each other.

11. The battery cell production equipment according to claim 9, characterized in that: The cleaning device includes a laser, and the laser emitted by the laser is used to clean the first active material layer.

12. The battery cell production equipment according to claim 9, characterized in that: The battery cell production equipment further includes a detection device, which is used to detect the size of the blank area.

13. The battery cell production equipment according to claim 12, characterized in that: The detection device comprises an image collector, and the image collector is arranged toward the first surface.

14. A battery device, characterized in that: The invention comprises a battery cell as claimed in any one of claims 1 to 5.

15. An electrical device, characterized in that: Comprising the battery device as claimed in claim 14, the battery device is used to provide electrical energy.

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