Pole piece, battery cell assembly, battery cell, battery and electrical device

Abstract

Disclosed are a pole piece (100), a battery cell assembly (200), a battery cell (300), a battery (400), and an electrical device (500), relating to the technical field of power batteries. The pole piece comprises: a first area (21) and a second area (22), alternately arranged on the pole piece; and protruding parts (31) arranged protrudingly in the first area in the direction of thickness of the pole piece, all of the protruding parts being formed on the same side in the direction of thickness of the pole piece; the protruding parts are arranged on the pole piece, and after the pole piece is wound, the protruding parts abut against an adjacent diaphragm, so that the distance to the pole piece is maintained by the protruding parts, facilitating control over the pole piece gap. The first area and the second area are arranged alternately, and the protruding parts are arranged in the first area, so as to improve the bonding force between the diaphragm and the pole piece at the second area; in addition, the shape of the protruding parts in the first area can be maintained after rolling, so that the pole piece can maintain the pole piece gap by means of the protruding parts.

Description

Electrodes, battery cell components, battery cells, batteries and electrical equipment

[0001] This application claims priority to the Chinese patent application filed with the Patent Office of China on September 28, 2023, with application number 202322651533.3, and invention name “Pole piece, battery cell assembly, battery cell, battery and electrical equipment”, all contents of which are incorporated by reference into this application. Technical Field

[0002] The present application belongs to the technical field of power batteries, and in particular relates to a pole piece, a battery cell assembly, a battery cell, a battery and an electrical device. Background Art

[0003] With the rapid development of the lithium battery industry, the production efficiency requirements for power battery cells are becoming increasingly higher. However, regardless of the cell structure, the safety performance of the cell needs to be improved. The safety performance of the cell includes the control of the gap between the cell pole pieces. If the gap between the cell pole pieces is too small, problems such as lithium deposition and cycle cracking of the pole pieces are more likely to occur.

[0004] Application Contents

[0005] In view of the above problems, the present application provides a pole piece, a battery cell assembly, a battery cell, a battery and an electrical device, which can solve the problem that the gap between the pole pieces of the battery cell is difficult to control.

[0006] In a first aspect, an embodiment of the present application provides a pole piece, comprising:

[0007] The first area and the second area are alternately arranged on the pole piece;

[0008] The raised portions are protrudingly provided in the first region along the thickness direction of the pole piece, and all the raised portions are formed on the same side in the thickness direction of the pole piece.

[0009] In the technical solution of this embodiment, a protrusion is provided on the pole piece, and after the pole piece is wound, the protrusion can abut against the adjacent diaphragm, so that the distance between the pole pieces is maintained by the protrusion, which facilitates the control of the pole piece gap and can create a buffer space for the pole piece to release the expansion stress of the pole piece; at the same time, the first zone and the second zone are alternately provided in sequence, the protrusion is provided in the first zone, and the second zone is used to provide space for the composite rolling of the pole piece, that is, when the pole piece is composite rolled, the pressure roller can be pressed on the second zone of the pole piece and improve the bonding force between the pole piece and the diaphragm in the second zone, while also reducing the possible damage to the protrusion during the rolling process, and can maintain the shape of the protrusion in the first zone after rolling, so that the pole piece can maintain the pole piece gap through the protrusion.

[0010] In some embodiments, the pole piece includes a first surface and a second surface that are oppositely disposed. A groove is formed on the second surface along the thickness direction of the pole piece, and the groove forms a protrusion on the first surface.

[0011] In the technical solution of this embodiment, the pole piece includes a first surface and a second surface arranged opposite to each other, the protrusion is protruded from the first surface, and a groove opposite to the protrusion is provided on the second surface, that is, the protrusion can be formed in the process of forming the groove on the second surface. The formation process is relatively simple and the cost is low.

[0012] In some embodiments, the electrode includes a current collector and an active material layer covering the current collector, and the protrusions are only formed on the active material layer on the same side of the current collector.

[0013] In the technical solution of this embodiment, some specific structures of the protrusions are provided, so that the protrusions are only formed on the active material layer, and the current collector is not deformed by the protrusions, and there are no pits corresponding to the protrusions on the other side of the pole piece opposite to the protrusions, so as to reduce the impact of the protrusions on the current collector.

[0014] In some embodiments, the pole piece includes a flat portion and a corner portion that are alternately arranged in sequence, and the first region and the second region are both arranged on the corner portion.

[0015] Because the square cell assembly can be hot-pressed after winding to improve its flatness and adjust the bonding force between the electrode and the diaphragm, hot pressing is usually performed on the flat portion of the square cell assembly. Hot pressing on the flat portion can easily cause the raised portion directly under pressure to deform or rupture, and can easily lead to a reduction in the gap between the electrode pieces at the corners. Accordingly, the technical solution of this embodiment arranges the first and second zones on the corners of the electrode pieces so that the raised portions can be protruded on the corners, thereby reducing damage to the raised portions during hot pressing. The raised portions can also alleviate the reduction in the gap between the electrode pieces at the corners, thereby improving the safety performance of the cell assembly.

[0016] In some embodiments, the length direction of the first region and the length direction of the second region are both consistent with the length direction of the pole piece.

[0017] In the technical solution of this embodiment, the first zone and the second zone are extended along the length direction of the electrode. During the pressing process of the electrode and the diaphragm, the electrode moves along the length direction and is gradually pressed. Therefore, the first zone and the second zone are extended along the length direction of the electrode. This can facilitate the pressing roller to continuously press the electrode and the diaphragm in the second zone, so that the electrode can be better bonded to the diaphragm in the second zone.

[0018] In some embodiments, the width of the first region is greater than or equal to 2 mm, and the width of the second region is greater than or equal to 2 mm.

[0019] The technical solution of this embodiment provides some specific parameters of the first zone and the second zone so that the first zone and the second zone can be alternately arranged on the pole piece. The size range ensures that the first zone on the pole piece will not be too small, so that the protrusion has enough space on the pole piece, and can ensure that there is sufficient contact area between the protrusion and the adjacent diaphragm, so as to provide a gap between adjacent pole pieces and better alleviate the situation where the gap between adjacent pole pieces is reduced.

[0020] In some embodiments, a ratio of the sum of the widths of all the second regions to the width of the pole piece is less than or equal to 0.1.

[0021] In the technical solution of this embodiment, the width of the second zone is further limited, so that the first zone can have a larger area, so that the protrusion has a larger space on the pole piece, and can have a more sufficient contact area between the protrusion and the adjacent diaphragm, so as to provide a gap between adjacent pole pieces and better alleviate the situation of the reduction of the gap between adjacent pole pieces.

[0022] In some embodiments, the length direction of the first region and the length direction of the second region are both consistent with the width direction of the pole piece.

[0023] The technical solution of this embodiment provides other arrangements of the first zone and the second zone. This arrangement can also maintain the distance between the pole pieces through the protrusions; at the same time, the second zone can also provide space for composite rolling of the pole pieces.

[0024] In some embodiments, the protrusion is in the shape of a boss, and a plurality of protrusions are densely distributed in the first region.

[0025] In the technical solution of this embodiment, some specific structures of the protrusions are provided, so that the protrusions are in the shape of bosses and densely distributed in the first area. That is, at this time the protrusions are in the shape of convex points, so that the electrolyte can flow between the protrusions, which is beneficial to the transmission of the electrolyte.

[0026] In some embodiments, the protrusion is a continuous protrusion structure and is formed in the first region.

[0027] In the technical solution of this embodiment, other specific structures of the protrusion are provided, so that the protrusion is a continuous structure and is formed in the first zone. The extension direction of the protrusion in the first zone is roughly the same as the extension direction of the first zone. At this time, in addition to alleviating the gap change between the pole pieces, the protrusion can also form a directional transmission channel between the protrusions to facilitate the transmission of the electrolyte.

[0028] In some embodiments, the size of the protrusion in the thickness direction of the pole piece ranges from 10um to 100um.

[0029] The technical solution of this embodiment provides some specific parameters of the protrusion, specifically provides the size range of the protrusion in the thickness direction of the pole piece, so as to determine the spacing range between the pole pieces. This range can leave a buffer space for the expansion of the pole pieces, thereby reducing the occurrence of diaphragm closure, lithium deposition, etc. caused by the expansion of the pole pieces.

[0030] In a second aspect, some embodiments of the present application further provide a battery cell assembly, including the pole piece provided by some embodiments of the first aspect; and

[0031] The diaphragm is arranged on opposite sides of the electrode.

[0032] In some embodiments, the battery cell assembly includes a positive electrode sheet and a negative electrode sheet, and the electrode sheet is used as a positive electrode sheet and / or a negative electrode sheet;

[0033] The positive pole sheets and the negative pole sheets are arranged alternately in sequence, and a separator is provided between adjacent positive pole sheets and negative pole sheets.

[0034] In the technical solution of this embodiment, pole pieces with protrusions and pole pieces without protrusions are arranged alternately, or all pole pieces are pole pieces with protrusions. On the premise that the protrusions can provide the required gap between the pole pieces, the deformation of the pole pieces is reduced, and more flow space for the electrolyte between the pole pieces can also be provided.

[0035] In some embodiments, the bonding force between the electrode and the diaphragm at a location corresponding to the second region is greater than 1N.

[0036] The technical solution of this embodiment provides some parameter ranges for the bonding force between the electrode and the adjacent diaphragm. Specifically, the bonding force between the electrode and the diaphragm at the corresponding portion of the second zone is made greater than 1N to enhance the bonding force between the electrode and the diaphragm.

[0037] In a third aspect, some embodiments of the present application further provide a battery cell, including the pole piece provided by some embodiments of the first aspect; or the battery cell assembly provided by some embodiments of the second aspect.

[0038] In a fourth aspect, some embodiments of the present application further provide a battery, comprising the pole piece provided by some embodiments of the first aspect; or the battery cell assembly provided by some embodiments of the second aspect; or the battery cell provided by some embodiments of the third aspect.

[0039] In the fifth aspect, some embodiments of the present application provide an electrical device, including the pole pieces provided by some embodiments of the first aspect; or the battery cell assemblies provided by some embodiments of the second aspect; or the battery cells provided by some embodiments of the third aspect; or the batteries provided by some embodiments of the fourth aspect.

[0040] 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

[0041] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present application. The same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0042] FIG1 is a schematic diagram of an electrical device provided in some embodiments of the present application.

[0043] FIG2 is a schematic diagram of an explosion of a battery provided in some embodiments of the present application.

[0044] FIG3 is a schematic diagram of an explosion of a battery cell provided in some embodiments of the present application.

[0045] FIG4 is a schematic diagram of a pole piece provided in some embodiments of the present application.

[0046] FIG5 is a schematic cross-sectional view of the section AA in FIG4 in some embodiments of the present application.

[0047] FIG6 is a schematic cross-sectional view of the section AA in FIG4 in some other embodiments of the present application.

[0048] FIG7 is a schematic diagram of pole pieces in other embodiments of the present application.

[0049] FIG8 is a schematic diagram of pole pieces in some other embodiments of the present application.

[0050] FIG9 is a schematic diagram of pole pieces in some other embodiments of the present application.

[0051] FIG10 is a schematic diagram of pole pieces in some other embodiments of the present application.

[0052] FIG11 is a schematic diagram of pole pieces in some other embodiments of the present application.

[0053] FIG12 is a three-dimensional schematic diagram of a battery cell assembly in some embodiments of the present application.

[0054] FIG13 is a schematic cross-sectional view of a portion BB in FIG12 in some embodiments of the present application.

[0055] FIG14 is a schematic cross-sectional view of a battery cell assembly in some embodiments of the present application.

[0056] The meanings of the marks in the figure are: 100, electrode; 11, current collector; 12, active material layer; 21, first area; 22, second area; 31, raised portion; 32, groove; 41, first surface; 42, second surface; 51, flat portion; 52, corner; 200, battery cell assembly; 61, positive electrode sheet; 62, negative electrode sheet; 63, diaphragm; 300, battery cell; 71, casing; 72, end cover; 400, battery; 80, box; 500, electrical equipment. Modes for Carrying Out the Invention

[0057] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0058] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0059] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0060] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0061] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0062] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0063] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship 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 device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0064] In the description of the embodiments of this application, unless otherwise expressly specified or limited, technical terms such as "mounted," "connected," "connect," and "fixed" should be interpreted broadly. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of these terms in the embodiments of this application based on specific circumstances.

[0065] Currently, market developments indicate that power batteries are becoming increasingly widely used. They are not only used in energy storage systems such as hydropower, thermal, wind, and solar power plants, but are also widely used in electric vehicles like electric bicycles, electric motorcycles, and electric vehicles, as well as in military equipment and aerospace. As power battery applications continue to expand, market demand is also growing.

[0066] As market demand increases, the production efficiency of power battery cells is becoming increasingly demanding. However, regardless of the cell structure, the safety performance of the cell needs to be improved. The safety performance of the cell includes the control of the gap between the cell electrodes. If the gap between the cell electrodes is too small, problems such as lithium deposition and cycle cracking of the electrode sheets are more likely to occur.

[0067] Currently, there are some power battery cells that maintain the gap between pole pieces by setting bumps on the pole pieces. For example, one side of the pole piece is embossed to form bumps or patterns protruding from the pole piece. During the winding process of the pole piece, these bumps or patterns support the other adjacent pole piece, thereby alleviating the reduction in the gap between the two adjacent pole pieces.

[0068] For composite wound battery cell assemblies, the electrode and separator need to be rolled with a laminating roller after lamination to strengthen the bonding between the electrode and the separator. Currently, the laminating roller can flatten the protrusions or patterns on electrode sheets with raised points, leading to structural failure. The laminating roller can also cause cracks at the protrusions or patterns on the electrode sheets.

[0069] Based on the above considerations, in order to alleviate the negative impact caused by the reduction of the gap between the pole pieces and at the same time reduce the risk of damage to the protrusions and patterns, the present application provides a pole piece, on which a first area and a second area are alternately arranged, and a protrusion is arranged in the first area. The protrusion in the first area can play a role in maintaining the gap between the pole pieces. After the pole piece is wound, the protrusion can abut against the adjacent diaphragm to maintain the gap between the pole pieces. When the pole piece expands and deforms or in other situations, the gap formed by the protrusion can provide a buffer space for the deformation of the pole piece to relieve the expansion stress. The second area is used to be compressed during the process of compounding the pole piece and the diaphragm, so that the pole piece can have a greater bonding force with the diaphragm in the second area to meet the compounding requirements between the pole piece and the diaphragm.

[0070] The battery cells disclosed in the embodiments of the present application can be used in electrical devices that use batteries as power sources or various energy storage systems that use batteries as energy storage elements. Electrical devices may include, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, battery-powered vehicles, electric vehicles, ships, spacecraft, and the like. Electric toys may include fixed or mobile electric toys, such as game consoles, electric vehicle toys, electric ship toys, and electric airplane toys, and spacecraft may include airplanes, rockets, space shuttles, and spacecraft, and the like.

[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] Referring to Figure 1, Figure 1 is a schematic diagram of the structure of a vehicle provided in some embodiments of the present application. The vehicle can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 400 is provided inside the vehicle, and the battery 400 can be provided at the bottom, head or tail of the vehicle. The battery 400 can be used to power the vehicle. For example, the battery 400 can serve as an operating power source for the vehicle. The vehicle may also include a controller and a motor. The controller is used to control the battery 400 to power the motor, for example, for starting, navigating and operating power requirements of the vehicle during driving.

[0073] In some embodiments of the present application, the battery 400 can serve not only as the operating power source of the vehicle, but also as the driving power source of the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0074] Referring to Figure 2, Figure 2 is an exploded view of a battery 400 provided in some embodiments of the present application. The battery 400 includes a housing 80 and a battery cell 300, with the battery cell 300 being housed within the housing 80. The housing 80 is used to provide a storage space for the battery cell 300, and the housing 80 can have a variety of structures. In some embodiments, the housing 80 can include a first portion and a second portion, the first portion and the second portion overlapping each other, and the first portion and the second portion together define a storage space for accommodating the battery cell 300. The second portion can be a hollow structure with one end open, and the first portion can be a plate-like structure, with the first portion overlapping the open side of the second portion, so that the first portion and the second portion together define a storage space. The first portion and the second portion can also be hollow structures with one end open, with the open side of the first portion overlapping the open side of the second portion. Of course, the housing 80 formed by the first and second portions can have a variety of shapes, such as a cylinder, a rectangular parallelepiped, etc.

[0075] In the battery 400, there may be multiple battery cells 300, and the multiple battery cells 300 may be connected in series, in parallel, or in a hybrid connection. A hybrid connection refers to a combination of series and parallel connections among the multiple battery cells 300. The multiple battery cells 300 may be directly connected in series, in parallel, or in a hybrid connection, and then the entire battery 400 structure may be housed within the housing 80. Of course, the battery 400 may also be formed by first connecting multiple battery cells 300 in series, in parallel, or in a hybrid connection to form a battery module 400, and then the multiple battery modules 400 may be connected in series, in parallel, or in a hybrid connection to form a complete battery module, and then housed within the housing 80. The battery 400 may also include other structures, for example, the battery 400 may also include a busbar component for electrically connecting the multiple battery cells 300.

[0076] Each battery cell 300 may be a secondary battery or a primary battery; it may also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 300 may be cylindrical, flat, rectangular, or in other shapes.

[0077] Referring to Figure 3, Figure 3 is a schematic diagram of the exploded structure of a battery cell 300 provided in some embodiments of the present application. A battery cell 300 is the smallest unit that makes up a battery 400. As shown, the battery cell 300 includes an end cap 72, a housing 71, a cell assembly 200, and other functional components.

[0078] The end cap 72 is a component that covers the opening of the housing 71 to isolate the internal environment of the battery cell 300 from the external environment. The shape of the end cap 72 can be adapted to the shape of the housing 71 to fit the housing 71. Optionally, the end cap 72 can be made of a material with a certain hardness and strength (such as an aluminum alloy). This prevents the end cap 72 from deforming when subjected to compression or collision, thereby enhancing the structural strength and safety of the battery cell 300. Functional components such as electrode terminals can be provided on the end cap 72. The electrode terminals can be used to electrically connect to the battery cell assembly 200 to output or input electrical energy to or from the battery cell 300. In some embodiments, the end cap 72 can also be provided with a pressure relief mechanism for relieving internal pressure when the internal pressure or temperature of the battery cell 300 reaches a threshold. The end cap 72 can also be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this embodiment of the present application does not impose any specific limitations on this. In some embodiments, an insulating member may be provided inside the end cap 72 to isolate the electrical connection components in the housing 71 from the end cap 72 to reduce the risk of short circuit. For example, the insulating member may be made of plastic, rubber, or the like.

[0079] The housing 71 is a component that cooperates with the end cap 72 to form the internal environment of the battery cell 300. This internal environment can accommodate the battery cell assembly 200, electrolyte, and other components. The housing 71 and end cap 72 can be separate components. An opening can be provided in the housing 71, and the end cap 72 is placed over the opening to form the internal environment of the battery cell 300. Alternatively, the end cap 72 and housing 71 can be integrated. Specifically, the end cap 72 and housing 71 can form a common connection surface before other components are inserted into the housing. When the interior of the housing 71 is to be enclosed, the end cap 72 is placed over the housing 71. The housing 71 can have a variety of shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, or a hexagonal prism. Specifically, the shape of the housing 71 can be determined based on the specific shape and size of the battery cell assembly 200. The housing 71 can be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this embodiment of the present application does not impose any particular limitations on this.

[0080] The battery cell assembly 200 is a component in the battery cell 300 where electrochemical reactions occur. One or more battery cell assemblies 200 may be contained in the shell 71. The battery cell assembly 200 is mainly formed by winding or stacking a positive electrode sheet 61 and a negative electrode sheet 62, and a separator 63 is usually provided between the positive electrode sheet 61 and the negative electrode sheet 62. The parts of the positive electrode sheet 61 and the negative electrode sheet 62 with active materials constitute the main body of the battery cell assembly 200, and the parts of the positive electrode sheet 61 and the negative electrode sheet 62 without active materials each constitute a tab. The positive electrode tab and the negative electrode tab may be located together at one end of the main body or respectively at both ends of the main body. During the charge and discharge process of the battery 400, the positive electrode active material and the negative electrode active material react with the electrolyte, and the tabs connect the electrode terminals to form a current loop.

[0081] According to some embodiments of the present application, referring to Figures 4 to 7, Figure 4 is a structural schematic diagram of the pole piece 100 in some embodiments of the present application, Figure 5 is a cross-sectional schematic diagram at AA in some embodiments of Figure 4, Figure 6 is a cross-sectional schematic diagram at AA in other embodiments of Figure 4, and Figure 7 is a structural schematic diagram of the pole piece 100 in other embodiments of the present application.

[0082] As shown in the figure, the direction of the X-axis in the figure is the length direction of the electrode 100. The electrode 100 is usually longer to facilitate rolling and winding into a battery cell assembly 200; the direction of the Y-axis in the figure is the width direction of the electrode 100. After the electrode 100 is wound, the width of the electrode 100 determines the height of the battery cell assembly 200; the direction of the Z-axis in the figure is the thickness direction of the electrode 100.

[0083] In the first aspect, some embodiments of the present application provide a pole piece 100, comprising: a first zone 21 and a second zone 22, the first zone 21 and the second zone 22 being alternately arranged on the pole piece 100 in sequence; a raised portion 31, the raised portion 31 being protruded in the first zone 21 along the thickness direction of the pole piece 100, and all the raised portions 31 are formed on the same side of the thickness direction of the pole piece 100.

[0084] The first zone 21 and the second zone 22 refer to areas set on the surface of the pole piece 100, and the first zone 21 and the second zone 22 are alternately set on the surface of the same side of the pole piece 100; in addition to the first zone 21 and the second zone 22, other areas can also be set on the surface of the pole piece 100, that is, the sum of the areas of all the first zones 21 and the second zones 22 can be equal to the area of ​​the corresponding surface of the pole piece 100, and the sum of the areas of all the first zones 21 and the second zones 22 can also be less than the area of ​​the corresponding surface of the pole piece 100; the shape of the first zone 21 and the second zone 22 can be a bar, or a circle, a square or other regular shape, and the shape of the first zone 21 and the second zone 22 can also be S-shaped or other irregular shapes; the first zone 21 and the second zone 22 can extend along the length direction (X) of the pole piece 100, or along the width direction (Y) of the pole piece 100, or along other directions.

[0085] The raised portion 31 refers to a protruding structure that is higher than the surface of the pole piece 100; the cross-sectional shape of the raised portion 31 can be semicircular, trapezoidal, square or other regular shapes, and the cross-sectional shape of the raised portion 31 can also be wavy or other irregular shapes; the raised portion 31 can be a boss-like structure, or a continuous long strip, square or other shaped structure; the raised portion 31 is formed on the surface of the same side of the pole piece 100, and a pit corresponding to the raised portion 31 can be provided on the other surface of the pole piece 100 opposite to the raised portion 31, and the other surface of the pole piece 100 opposite to the raised portion 31 can also be a flat surface.

[0086] The raised portions 31 are formed in the first area 21 along the thickness direction of the pole piece 100, and all the raised portions 31 are formed on the same side of the thickness direction of the pole piece 100, that is, the raised portions 31 all protrude from the pole piece 100 from the same side of the pole piece 100; after the pole piece 100 is wound and forms the battery cell assembly 200, the raised portions 31 can abut against the adjacent diaphragm 63, so that there is a gap between the two adjacent pole pieces 100, and the gap can provide a buffer space for the expansion deformation of the pole piece 100 to relieve the expansion stress of the pole piece 100.

[0087] At this time, there is no raised portion 31 in the second area 22 and it is relatively flat. During the composite rolling process of the electrode 100, the composite roller can roll the second area 22 and enhance the bonding force between the electrode 100 at the position corresponding to the second area 22 and the diaphragm 63, thereby meeting the bonding force requirements between the electrode 100 and the diaphragm 63.

[0088] In this embodiment, a protrusion 31 is provided on the pole piece 100. After the pole piece 100 is wound, the protrusion 31 can abut against the adjacent diaphragm 63, so that the distance between the pole pieces 100 is maintained by the protrusion 31, which facilitates the control of the gap between the pole pieces 100 and can create a buffer space for the pole piece 100 to release the expansion stress of the pole piece 100; at the same time, the first area 21 and the second area 22 are alternately provided in sequence, and the protrusion 31 is provided in the first area 21, and the second area 22 is used to provide space for the composite rolling of the pole piece 100, that is, when the pole piece 100 is composite rolled, the pressure roller can be pressed on the second area 22 of the pole piece 100, and improve the bonding force between the pole piece 100 and the diaphragm 63 in the second area 22, and at the same time can maintain the shape of the protrusion 31 in the first area 21 after rolling, so that the pole piece 100 can maintain the gap between the pole pieces 100 through the protrusion 31.

[0089] In some embodiments, referring to FIG. 4 and FIG. 5 , FIG. 4 is a schematic structural diagram of the pole piece 100 in some embodiments of the present application, and FIG. 5 is a schematic cross-sectional diagram at AA in some embodiments of FIG. 4 .

[0090] The pole piece 100 includes a first surface 41 and a second surface 42 opposite to each other. A groove 32 is formed on the second surface 42 along the thickness direction of the pole piece 100 , and the groove 32 forms a protrusion 31 on the first surface 41 .

[0091] The first surface 41 and the second surface 42 are respectively formed on two opposite surfaces of the pole piece 100 . After the pole piece 100 is wound, the first surface 41 and the second surface 42 are respectively adjacent to different separators 63 .

[0092] The second surface 42 is provided with a groove 32 , and the groove 32 forms a protrusion 31 on the first surface 41 . That is, the processing equipment can press out the groove 32 at the corresponding position of the second surface 42 to form the protrusion 31 on the first surface 41 .

[0093] In this embodiment, the pole piece 100 includes a first surface 41 and a second surface 42 arranged opposite to each other, so that the protrusion 31 is protruded from the first surface 41, and a groove 32 opposite to the protrusion 31 is provided on the second surface 42, that is, the protrusion 31 can be formed in the process of forming the groove 32 on the second surface 42, and the formation process is relatively simple and the cost is low.

[0094] In some embodiments, referring to FIG. 4 and FIG. 6 , FIG. 4 is a schematic structural diagram of the pole piece 100 in some embodiments of the present application, and FIG. 6 is a schematic cross-sectional diagram at AA in other embodiments of FIG. 4 .

[0095] The electrode 100 includes a current collector 11 and an active material layer 12 covering the current collector 11 . The protrusions 31 are only formed on the active material layer 12 on the same side of the current collector 11 .

[0096] The current collector 11 refers to a structure or component in the electrode 100 that collects current. In the lithium-ion battery 400 , the current collector 11 may be a metal foil, such as copper foil or aluminum foil. The current collector 11 may also include a tab.

[0097] The active material layer 12 refers to an active material film coated on the surface of the current collector 11 . The active material layer 12 is used to store active ions and realize ion exchange. The active material layer 12 covers opposite sides of the current collector 11 .

[0098] The raised portion 31 is only formed on the active material layer 12, that is, the raised portion 31 can be obtained by embossing the electrode 100 or other processes. At this time, the raised portion 31 only protrudes from the active material layer 12 on one side of the current collector 11, while the active material layer 12 and the current collector 11 on the other side of the current collector 11 do not deform, and the side of the electrode 100 away from the raised portion 31 is a flat surface.

[0099] This embodiment provides some specific structures of the protrusion 31. The protrusion 31 is formed on the active material layer 12, but the current collector 11 is not deformed by the protrusion 31, that is, there is no pit corresponding to the protrusion 31 on the other side of the electrode 100 opposite to the protrusion 31, so as to reduce the impact of the protrusion 31 on the current collector 11.

[0100] In some embodiments, refer to FIG7 , which is a schematic structural diagram of the pole piece 100 in some embodiments of the present application.

[0101] The pole piece 100 includes a flat portion 51 and a corner portion 52 which are alternately arranged in sequence, and the first area 21 and the second area 22 are both arranged on the corner portion 52 .

[0102] The flat portion 51 refers to a relatively flat portion of the pole piece 100 after winding, and the corner portion 52 refers to a bent portion of the pole piece 100 after winding. The flat portion 51 and the corner portion 52 are alternately arranged in sequence.

[0103] The first zone 21 and the second zone 22 are both formed on the corner portion 52, that is, the protrusion 31 is also formed on the corner portion 52; after the pole piece 100 is wound, the protrusion 31 on the corner portion 52 can abut against the corner portion 52 of another adjacent pole piece 100, so that the corner portions 52 of the two adjacent pole pieces 100 can have the required gap, and can also alleviate the reduction of the gap between the two adjacent corner portions 52 when the pole piece 100 expands, is under pressure, etc.

[0104] The first area 21 and the second area 22 may extend along the width direction of the pole piece 100 on the corner portion 52 , or may extend along the length direction of the pole piece 100 or other directions. The shapes of the first area 21 and the second area 22 may be circular, square, S-shaped or other shapes.

[0105] It can be understood that, considering the formation of the protrusion 31 and the bonding strength between the pole piece 100 and the diaphragm 63 at the corner portion 52, a second area 22 is also provided on the corner portion 52, so that the pole piece 100 can have a higher bonding strength with the diaphragm 63 at the corner portion 52, and also make the protrusion 31 on the pole piece 100 less susceptible to being squeezed by the pressure roller, so as to reduce damage, rupture, etc. of the protrusion 31.

[0106] Because the electrode 100 and the diaphragm 63 are directly rolled into the battery cell assembly 200, in order to improve the flatness of the battery cell assembly 200 and adjust the bonding force between the electrode 100 and the diaphragm 63, the battery cell assembly 200 is usually required to be hot-pressed and shaped. During this process, the flat portion 51 of the battery cell assembly 200 will be subjected to hot pressing, and the protrusions or patterns on the flat portion 51 are prone to cracking, deformation, etc., and the gap between two adjacent corner portions 52 will be reduced. Accordingly, in this embodiment, the first area 21 and the second area 22 are arranged on the corner portion 52 of the electrode 100 so that the protrusion 31 can be protruded on the corner portion 52. At this time, the protrusion 31 can alleviate the reduction in the distance between the two adjacent corner portions 52, thereby improving the safety performance of the battery cell assembly 200.

[0107] According to some embodiments of the present application, referring to FIG. 4 , FIG. 4 is a schematic structural diagram of the pole piece 100 in some embodiments of the present application.

[0108] In some embodiments of the present application, the length direction of the first region 21 and the length direction of the second region 22 are both consistent with the length direction of the pole piece 100 .

[0109] The length direction of the first region 21 refers to the extension direction of the long side of the first region 21 , the length direction of the second region 22 refers to the extension direction of the long side of the second region 22 , and the length direction of the pole piece 100 is the direction of the X axis in the figure.

[0110] The length direction of the first region 21 and the length direction of the second region 22 are both consistent with the length direction of the pole piece 100, which means that the length direction of the first region 21 and the length direction of the second region 22 are parallel or approximately parallel to the direction of the X-axis.

[0111] During the pressing process of the electrode 100 and the diaphragm 63, the electrode 100 moves along the length direction and is gradually pressed. In this embodiment, the first zone 21 and the second zone 22 extend along the length direction of the electrode 100, which can facilitate the pressing roller to continuously press the electrode 100 and the diaphragm 63 in the second zone 22, so that the electrode 100 can be better bonded to the diaphragm 63 in the second zone 22.

[0112] In some embodiments, the width of the first region 21 is greater than or equal to 2 millimeters (mm), and the width of the second region 22 is greater than or equal to 2 mm.

[0113] The width of the first zone 21 refers to the distance between the boundaries of two adjacent second zones 22. For example, when the extension direction of the first zone 21 is parallel to the length direction of the pole piece 100, the width of the first zone 21 refers to the size of the first zone 21 in the Y-axis direction; the width of the first zone 21 can be 2 mm, or 3 mm, 4 mm, 5 mm, 10 mm, etc.

[0114] The width of the second zone 22 refers to the distance between the boundaries of two adjacent first zones 21. For example, when the extension direction of the second zone 22 is parallel to the length direction of the pole piece 100, the width of the second zone 22 refers to the size of the second zone 22 in the Y-axis direction; the width of the second zone 22 can be 2 mm, or 3 mm, 4 mm, 5 mm, 10 mm, etc.

[0115] This embodiment provides some specific parameters of the first zone 21 and the second zone 22 so that the first zone 21 can be alternately arranged with the second zone 22 on the pole piece 100. The size range ensures that the first zone 21 on the pole piece 100 will not be too small, so that the protrusion 31 has sufficient space on the pole piece 100, and can ensure that there is sufficient contact area between the protrusion 31 and the adjacent pole piece 100, so as to provide a gap between adjacent pole pieces 100 and better alleviate the situation where the gap between adjacent pole pieces 100 is reduced.

[0116] In some embodiments, the ratio of the sum of the widths of all the second regions 22 to the width of the pole piece 100 is less than or equal to 0.1. The ratio may be 0.1, 0.07, 0.05, 0.03, etc.

[0117] When the extension direction of the second region 22 is parallel to the length direction of the pole piece 100, the sum of the widths of all the second regions 22 refers to the sum of the dimensions of all the second regions 22 in the width direction of the pole piece 100. At this time, the ratio of the sum of the widths of all the second regions 22 to the width of the pole piece 100 can also represent the ratio of the sum of the areas of all the second regions 22 to the surface area of ​​the pole piece 100.

[0118] The ratio of the sum of the widths of all the second regions 22 to the width of the pole piece 100 being less than or equal to 0.1 also means that the ratio of the sum of the widths of all the first regions 21 to the width of the pole piece 100 is greater than or equal to 0.9.

[0119] This embodiment further limits the width of the second zone 22 and the width of the first zone 21, so that the first zone 21 can have a larger area, so that the protrusion 31 has a larger space on the pole piece 100, and can have a more sufficient contact area between the protrusion 31 and the adjacent pole piece 100, so as to provide a gap between adjacent pole pieces 100 and better alleviate the situation of the reduction of the gap between adjacent pole pieces 100.

[0120] According to some embodiments of the present application, referring to FIG. 7 , FIG. 7 is a schematic structural diagram of the pole piece 100 in some embodiments of the present application. In the figure, the length direction of the first region 21 and the length direction of the second region 22 are consistent with the width direction of the pole piece 100 .

[0121] Refer to Figure 8, which is a structural schematic diagram of the pole piece 100 in some embodiments of the present application. In the figure, the length direction of the first zone 21 and the second zone 22 forms an angle with the width direction of the pole piece 100, so that the first zone 21 and the second zone 22 are inclined relative to the wide side and long side of the pole piece 100.

[0122] Refer to Figure 9, which is a structural schematic diagram of the pole piece 100 in some embodiments of the present application. In the figure, the length direction of a second area 22 is consistent with the length direction of the pole piece 100, and the surface of the pole piece 100 is divided into two areas on both sides of the second area 22. In the two areas, the first area 21 and the second area 22 are alternately arranged in sequence.

[0123] This embodiment provides some other arrangements of the first area 21 and the second area 22 , which can also maintain the distance between the pole pieces 100 through the protrusions 31 ; at the same time, the second area 22 can also provide space for composite rolling of the pole pieces 100 .

[0124] According to some embodiments of the present application, referring to Figures 4, 5, and 6, Figure 4 is a structural schematic diagram of the pole piece 100 in some embodiments of the present application, Figure 5 is a cross-sectional schematic diagram at AA in some embodiments of Figure 4, and Figure 6 is a cross-sectional schematic diagram at AA in other embodiments of Figure 4.

[0125] In some embodiments of the present application, the protrusion 31 is in the shape of a boss, and a plurality of protrusions 31 are densely distributed in the first area 21 .

[0126] The boss shape refers to a protruding structure on the pole piece 100 . The specific shape of the protrusion 31 can be a prism shape, a truncated cone shape or other shapes, that is, the cross-sectional shape of the protrusion 31 can be a trapezoid, a rectangle or other shapes.

[0127] Multiple protrusions 31 are densely distributed in the first zone 21, so that multiple protrusions 31 can fill the first zone 21, so that there can be a large number of protrusions 31 in the first zone 21. A large number of protrusions 31 can enable the pole piece 100 to better form a gap with the adjacent diaphragm 63 during winding, so that the spacing between adjacent pole pieces 100 can meet the requirements.

[0128] There may be gaps between the plurality of protrusions 31 to facilitate the circulation of the electrolyte, thereby reducing the influence of the protrusions 31 on the circulation of the electrolyte.

[0129] This embodiment provides some specific structures of the protrusions 31, so that the protrusions 31 are in the shape of bosses and densely distributed in the first area 21. That is, at this time, the protrusions 31 are in the shape of convex points, so that the electrolyte can flow between the protrusions 31, which is beneficial to the electrolyte transmission.

[0130] According to some embodiments of the present application, referring to FIG. 10 and FIG. 11 , FIG. 10 is a schematic diagram of the pole piece 100 in some embodiments of the present application, and FIG. 11 is a schematic diagram of the pole piece 100 in other embodiments of the present application.

[0131] In some embodiments of the present application, the protrusion 31 is a continuous protrusion structure and is formed in the first region 21 .

[0132] The continuous raised structure refers to an integral structure formed in the first zone 21, that is, the first zone 21 has only one raised portion 31, and the raised portion 31 fills the first zone 21 or fills most of the space in the first zone 21; the continuous raised structure can be a straight-line strip, a zigzag strip or other shape; the cross-sectional shape of the continuous raised structure can be a trapezoid, a rectangle or other shapes.

[0133] The continuous raised structure can also enable the electrode 100 to better form a gap with the adjacent diaphragm 63 when winding, so that the spacing between two adjacent electrode pieces 100 can meet the requirements; and a transmission channel for electrolyte flow can also be formed between two adjacent continuous raised structures, so that the electrolyte can flow in a direction in the transmission channel, thereby achieving the effect of guiding the directional flow of the electrolyte.

[0134] This embodiment provides other specific structures of the protrusion 31, so that the protrusion 31 is formed as a continuous structure in the first zone 21, and the extension direction of the protrusion 31 in the first zone 21 is roughly the same as the extension direction of the first zone 21. At this time, in addition to alleviating the gap change between the electrode pieces 100, the protrusion 31 can also form a directional transmission channel between the protrusions 31 to facilitate electrolyte transmission.

[0135] According to some embodiments of the present application, the size of the protrusion 31 in the thickness direction of the pole piece 100 ranges from 10 micrometers (um) to 100um, and the size can specifically be 10um, 20um, 30um, 40um, 60um, 80um, 100um or other values.

[0136] The size of the protrusion 31 in the thickness direction of the pole piece 100 is the height of the protrusion 31 protruding from the surface of the pole piece 100, which is roughly equal to the distance between the pole piece 100 and the adjacent pole piece 100 or the diaphragm 63; it can be understood that according to the different requirements of the battery cell assembly 200 for the distance between adjacent pole pieces 100, the size of the protrusion 31 can also be other sizes.

[0137] This embodiment provides some specific parameters of the protrusion 31, specifically provides the size range of the protrusion 31 in the thickness direction of the electrode 100, so as to determine the spacing range between the electrode pieces 100. This range can leave a buffer space for the expansion of the electrode pieces 100, thereby reducing the occurrence of situations such as closure of the diaphragm 63 and lithium deposition caused by the expansion of the electrode pieces 100.

[0138] According to some embodiments of the present application, the pole piece 100 includes a first zone 21 and a second zone 22 alternately arranged along its length direction. The first zone 21 is densely distributed with spaced protrusions 31, and the protrusions 31 are semi-spherical structures protruding from the first surface 41 of the pole piece 100.

[0139] When the pole piece 100 is wound, the protrusion 31 can abut against the adjacent pole piece 100 or diaphragm 63 so that the distance between the pole piece 100 where the protrusion 31 is located and the adjacent pole piece 100 or diaphragm 63 can meet the requirements.

[0140] According to some embodiments of the present application, referring to Figures 12 to 14, Figure 12 is a three-dimensional schematic diagram of the battery cell assembly 200 in some embodiments of the present application, Figure 13 is a cross-sectional schematic diagram at BB in Figure 12 in some embodiments of the present application, and Figure 14 is a cross-sectional schematic diagram of the battery cell assembly 200 in some embodiments of the present application.

[0141] In a second aspect, some embodiments of the present application provide a battery cell assembly 200 , comprising the pole piece 100 and the diaphragm 63 provided in some embodiments of the first aspect, wherein the diaphragm 63 is disposed on opposite sides of the pole piece 100 .

[0142] Under the action of the protrusion 31, the distance between the surface of the protrusion 31 of the pole piece 100 and the adjacent diaphragm 63 is roughly equal to the height of the protrusion 31, so as to facilitate the control of the gap of the pole piece 100 and create a buffer space for the pole piece 100 to release the expansion stress of the pole piece 100.

[0143] In some embodiments, the battery cell assembly 200 includes a positive electrode sheet 61 and a negative electrode sheet 62, and the electrode sheet 100 is used as the positive electrode sheet 61 and / or the negative electrode sheet 62; the positive electrode sheet 61 and the negative electrode sheet 62 are arranged alternately in sequence, and a separator 63 is provided between adjacent positive electrode sheets 61 and negative electrode sheets 62.

[0144] That is, in the battery cell assembly 200 provided in the embodiment of the second aspect, the electrode sheet 100 provided in some embodiments of the first aspect can be a positive electrode sheet 61, a negative electrode sheet 62, or can serve as both a positive electrode sheet 61 and a negative electrode sheet 62. For example, the material of the electrode sheet 100 can be changed so that the electrode sheet 100 can serve as the positive electrode sheet 61 and / or the negative electrode sheet 62. In some embodiments, when the electrode sheet 100 provided in some embodiments of the first aspect is a positive electrode sheet 61, the negative electrode sheet 62 is relatively flat and does not have a protrusion 31; in other embodiments, when the electrode sheet 100 provided in some embodiments of the first aspect is a negative electrode sheet 62, the positive electrode sheet 61 is relatively flat and does not have a protrusion 31; in still other embodiments, the electrode sheet 100 serves as both a positive electrode sheet 61 and a negative electrode sheet 62, that is, both the positive electrode sheet 61 and the negative electrode sheet 62 are provided with a protrusion 31.

[0145] The separator 63 is disposed between the positive electrode sheet 61 and the negative electrode sheet 62 to reduce the occurrence of a short circuit between the positive electrode sheet 61 and the negative electrode sheet 62 and to form a movement channel for ions in the electrolyte.

[0146] In this embodiment, the pole pieces 100 with the protrusions 31 and the pole pieces 100 without the protrusions 31 are alternately arranged, or all the pole pieces 100 are provided with the protrusions 31. On the premise that the protrusions 31 can provide the required gaps between the pole pieces 100, the deformation of the pole pieces 100 is reduced, and more flow space for the electrolyte between the pole pieces 100 can also be provided.

[0147] In some embodiments, the bonding force between the electrode 100 and the diaphragm 63 at the portion corresponding to the second region 22 is greater than 1 Newton (N). Specifically, the bonding force may be 1N, 2N, 3N, 5N, 10N, or other values.

[0148] This embodiment provides some parameter ranges between the electrode 100 and the adjacent diaphragm 63 . Specifically, the bonding force between the electrode 100 and the diaphragm 63 at the corresponding portion of the second region 22 is greater than 1N, thereby enhancing the bonding force between the electrode 100 and the diaphragm 63 .

[0149] In some embodiments, the bonding force between the electrode 100 and the diaphragm 63 at the portion corresponding to the first region 21 is greater than 0.5 N. The bonding force may specifically be 1 N, 2 N, 3 N, 5 N, 10 N or other values.

[0150] In a third aspect, some embodiments of the present application further provide a battery cell 300 , comprising the pole piece 100 provided in some embodiments of the first aspect; or the battery cell assembly 200 provided in some embodiments of the second aspect.

[0151] The battery cell 300 includes an end cap 72 , a housing 71 , a battery cell assembly 200 and other functional components.

[0152] The housing 71 and the end cover 72 can cooperate to form an internal environment of the battery cell 300 , wherein the formed internal environment can be used to accommodate the battery cell assembly 200 , electrolyte and other components.

[0153] In a fourth aspect, some embodiments of the present application further provide a battery 400, comprising the pole piece 100 provided by some embodiments of the first aspect; or the battery cell assembly 200 provided by some embodiments of the second aspect; or the battery cell 300 provided by some embodiments of the third aspect.

[0154] The battery 400 includes a housing 80 and a battery cell 300, wherein the battery cell 300 is accommodated in the housing 80. The housing 80 is used to provide a space for accommodating the battery cell 300. The housing 80 can adopt various structures, for example, the housing 80 can be cylindrical, rectangular or other shapes.

[0155] In the battery 400 , there may be multiple battery cells 300 , and the multiple battery cells 300 may be connected in series, in parallel, or in mixed connection.

[0156] In the fifth aspect, some embodiments of the present application also provide an electrical device 500, including the pole piece 100 provided by some embodiments of the first aspect; or the battery cell assembly 200 provided by some embodiments of the second aspect; or the battery cell 300 provided by some embodiments of the third aspect; or the battery 400 provided by some embodiments of the fourth aspect.

[0157] The electric device 500 may be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery-powered vehicle, an electric car, a ship, a spacecraft, etc. The electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc. The spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0158] 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 make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present application, and should all be included in the scope of protection of the present application.

Claims

1. A pole piece, characterized in that: include: The first area and the second area are alternately arranged on the pole piece; The raised portion is protrudingly arranged in the first area along the thickness direction of the pole piece, and all the raised portions are formed on the same side of the thickness direction of the pole piece.

2. The pole piece according to claim 1, characterized in that: The pole piece includes a first surface and a second surface that are oppositely disposed. A groove is concavely disposed on the second surface along a thickness direction of the pole piece, and the groove forms the protrusion on the first surface.

3. The pole piece according to claim 1, characterized in that: The pole piece includes a current collector and an active material layer covering the current collector, and the protrusion is only formed on the active material layer on the same side of the current collector.

4. The pole piece according to claim 1, characterized in that: The pole piece includes a flat portion and a corner portion which are alternately arranged in sequence, and the first area and the second area are both arranged on the corner portion.

5. The pole piece according to any one of claims 1 to 4, characterized in that: The length direction of the first region and the length direction of the second region are both consistent with the length direction of the pole piece.

6. The pole piece according to claim 5, characterized in that: The width of the first region is greater than or equal to 2 mm, and the width of the second region is greater than or equal to 2 mm.

7. The pole piece according to claim 6, characterized in that: The ratio of the sum of the widths of all the second regions to the width of the pole piece is less than or equal to 0.

1.

8. The pole piece according to any one of claims 1 to 7, characterized in that: The length direction of the first region and the second region are both consistent with the width direction of the pole piece.

9. The pole piece according to any one of claims 1 to 8, characterized in that: The protrusion is in a boss shape, and a plurality of the protrusions are densely distributed in the first area.

10. The pole piece according to any one of claims 1 to 9, characterized in that: The protrusion is a continuous protrusion structure and is formed in the first area.

11. The pole piece according to any one of claims 1 to 10, characterized in that: The size of the protrusion in the thickness direction of the pole piece ranges from 10um to 100um.

12. A battery cell assembly, characterized in that: comprising a pole piece as claimed in any one of claims 1 to 11; and The diaphragm is arranged on two opposite sides of the pole piece.

13. The battery core assembly according to claim 12, characterized in that: The battery cell assembly comprises a positive electrode sheet and a negative electrode sheet, and the electrode sheet is used as the positive electrode sheet and / or the negative electrode sheet; The positive electrode sheets and the negative electrode sheets are arranged alternately in sequence, and the separator is arranged between adjacent positive electrode sheets and negative electrode sheets.

14. The battery core assembly according to claim 12 or 13, characterized in that: The bonding force between the pole piece and the diaphragm at a location corresponding to the second region is greater than 1N.

15. A battery cell, characterized in that: It comprises a pole piece as described in any one of claims 1 to 11; or a battery core assembly as described in any one of claims 12 to 14.

16. A battery, characterized in that: It comprises the pole piece as described in any one of claims 1-11; or the battery core assembly as described in any one of claims 12-14; or the battery cell as described in claim 15.

17. An electrical equipment, characterized in that: It comprises the pole piece as described in any one of claims 1 to 11; or the battery core assembly as described in any one of claims 12 to 14; or the battery cell as described in claim 15; or the battery as described in claim 16.

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