Electrode sheet compositing apparatus and method, composite electrode sheet, battery, and electric device

Abstract

An electrode sheet compositing apparatus (100), comprising: an embossing roller set (10), which is used for forming an embossed structure (2101) on a first electrode sheet (210); and a compositing roller set (20) arranged downstream from the embossing roller set (10), the compositing roller set (20) comprising a first compositing roller (21) and an opposing second compositing roller (22); the first compositing roller (21) and the second compositing roller (22) are jointly used for rolling the first electrode sheet (210), a second electrode sheet (220), and a separator (230) to form a composite electrode sheet (200); the surface of the first compositing roller (21) is recessed and provides an avoidance slot (211), where the avoidance slot (211) is used for avoiding the embossed structure (2101) when the first compositing roller (21) and the second compositing roller (22) perform rolling. The composite electrode sheet (200) manufactured by using the electrode sheet compositing apparatus (100) can retain a electrode sheet gap after winding, and the problem of lithium plating can be mitigated.

Description

Electrode composite device and method, composite electrode, battery, and electrical equipment

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on September 28, 2023, with application number 202311277689.8, and invention name "Pole piece composite device and method, composite pole piece, battery, and electrical equipment", all contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of battery technology, and in particular to a pole piece composite device, a pole piece composite method, a composite pole piece, a battery, and an electrical device. Background Art

[0003] With the rapid development of the lithium battery industry, the production efficiency requirements for power batteries are getting higher and higher, and the battery cell composite winding mode has become an important technical means to improve the production efficiency of battery cells.

[0004] However, some wound battery cells have the problem of too small gaps between the pole pieces, which makes the pole pieces easily squeezed and causes problems such as cycle expansion and lithium deposition, affecting the cycle performance of the battery cells.

[0005] Summary of the Invention

[0006] In view of this, the present application provides a pole piece composite device, a pole piece composite method, a composite pole piece, a battery and an electrical equipment, which can enable the composite pole piece to maintain the pole piece gap after winding and reduce problems such as lithium plating.

[0007] The embodiment of the first aspect of the present application provides a pole piece composite device, comprising:

[0008] An embossing roller assembly, used for forming an embossed structure on the first pole piece;

[0009] A composite roller group is arranged downstream of the embossing roller group, and the composite roller group includes a first composite roller and a second composite roller arranged opposite to each other, and the first composite roller and the second composite roller are used together to roll the first electrode sheet, the second electrode sheet and the diaphragm to form a composite electrode sheet, and an avoidance groove is provided on the surface of the first composite roller, and the avoidance groove is used to avoid the embossing structure when the first composite roller and the second composite roller are rolling.

[0010] The electrode assembly device provided in the embodiment of the present application includes an embossing roller group and a composite roller group. The electrode assembly device can form an embossed structure on the first electrode sheet through the embossing roller group, and roll-compress the first electrode sheet, the second electrode sheet, and the diaphragm through the composite roller group. The avoidance groove on the composite roller group can avoid the embossed structure, so that the embossed structure on the first electrode sheet is not rolled after passing through the composite roller group. The embossed structure on the first electrode sheet can enable the composite electrode sheet to maintain the electrode gap after winding. Therefore, the above-mentioned electrode assembly device can produce composite electrode sheets and enable the composite electrode sheet to maintain the electrode gap after winding, reducing problems such as lithium plating and improving the cycle performance of the battery cell.

[0011] In some embodiments, the embossing roller group includes a first embossing roller and a second embossing roller arranged opposite to each other, a gap is provided between the first embossing roller and the second embossing roller for the first pole piece to pass through, and the surface of at least one of the first embossing roller and the second embossing roller is provided with embossing patterns.

[0012] By adopting the above technical solution, the embossing roller group can form an embossing structure on at least one side of the first pole piece.

[0013] In some embodiments, a plurality of embossing lines are provided at intervals on the surface of the first embossing roller to form a plurality of embossing structures on the first pole piece, and a plurality of avoidance grooves are provided at intervals on the surface of the first composite roller to avoid the plurality of embossing structures.

[0014] By adopting the above technical solution, the first embossing roller can form zebra-shaped embossing on the first pole piece, and the multiple avoidance grooves on the first composite roller can respectively avoid multiple embossing structures, so that the multiple embossing structures on the composite pole piece can be retained, which is conducive to uniformly maintaining the gap between the pole pieces.

[0015] In some embodiments, the embossing lines extend along the circumference of the first embossing roller, and the avoidance grooves extend along the circumference of the first composite roller.

[0016] By adopting the above technical solution, the pole piece composite device can form an embossed structure extending along the length direction of the first pole piece on the first pole piece and can avoid rolling the embossed structure.

[0017] In some embodiments, the width of the avoidance groove is greater than or equal to the width of the embossed pattern.

[0018] By adopting the above technical solution, the avoidance groove can provide sufficient avoidance space for the embossed structure.

[0019] In some embodiments, the embossing lines extend along the axial direction of the first embossing roller, and the avoidance grooves extend along the axial direction of the first composite roller.

[0020] By adopting the above technical solution, the electrode composite device can produce an embossed structure extending along the width direction of the first electrode and avoid the embossed structure being rolled by the composite roller group. Other areas of the first electrode can be composited with the second electrode, thereby increasing the composite area of ​​the electrode. The first electrode, the second electrode and the diaphragm are not easy to separate to avoid undesirable phenomena such as wrinkling during rolling.

[0021] In some embodiments, the arc length of the avoidance groove is greater than or equal to the arc length of the embossed pattern.

[0022] By adopting the above technical solution, the embossed structure produced by the embossing pattern can completely correspond to the avoidance groove, so that the embossed structure is not easily rolled by the first composite roller and the second composite roller.

[0023] In some embodiments, the electrode composite device also includes a first identification device and a second identification device for respectively identifying the markings on the first electrode piece. The first identification device is arranged upstream of the embossing roller group along the conveying direction of the first electrode piece, and the embossing roller can press down the first electrode piece according to the identification information of the first identification device; the second identification device is arranged upstream of the composite roller group along the conveying direction of the first electrode piece, and the composite roller group can rotate according to the identification information of the second identification device to adjust the position of the avoidance groove.

[0024] By setting up the first identification device and the second identification device, the first embossing roller can produce an embossing structure extending along the width direction of the first pole piece at a preset position of the first pole piece, and the first composite roller can accurately avoid the embossing structure to avoid rolling the embossing structure.

[0025] In some embodiments, the embossed structure protrudes in a direction close to or away from the second pole piece; wherein each of the embossed lines includes a plurality of spaced-apart convex points, or the embossed lines are in the form of continuous raised convex strips.

[0026] By adopting the above technical solution, the shape of the embossed pattern can be selected according to needs, and a certain gap can be maintained between the pole pieces.

[0027] In some embodiments, each of the embossed lines is continuously arranged, or each of the embossed lines is divided into multiple sections along its extending direction.

[0028] By adopting the above technical solution, the first embossing roller can produce continuous or discontinuous embossing on the first pole piece, and both can enable the composite pole piece to maintain the gap between the pole pieces after winding.

[0029] In some embodiments, in each of the embossed lines, the distance between two adjacent lines is 10 to 20 microns.

[0030] By adopting the above technical solution, the spacing between two adjacent sections of lines can be reasonably set, which will neither affect the effect of maintaining the gap of the electrode due to excessive spacing, nor significantly reduce the composite area and composite effect of the electrode due to excessive spacing.

[0031] In some embodiments, the plurality of embossed lines are distributed at equal intervals.

[0032] By adopting the above technical solution, the width and spacing of the embossed patterns can be flexibly set, and both can enable the composite pole piece to maintain the pole piece gap after winding.

[0033] In some embodiments, the distance between two adjacent embossed lines is 10 to 15 microns.

[0034] By adopting the above technical solution, the first embossing roller can produce an embossing structure with a reasonable area on the first pole piece.

[0035] In some embodiments, the embossing roller group further includes a downward pressing driving member, which is connected to the first embossing roller and is used to drive the first embossing roller to rise and fall.

[0036] By providing a downward pressing driving member, the embossing roller group can control the downward pressing of the first embossing roller to produce embossing structures of different heights on the first pole piece.

[0037] The embodiment of the second aspect of the present application provides a pole piece assembly method, using the pole piece assembly device provided in the first aspect, the pole piece assembly method comprising:

[0038] forming an embossing structure on the first pole piece by the embossing roller group;

[0039] The first pole piece, the second pole piece and the diaphragm are compounded by the compound roller group, and the avoidance groove is opposite to the embossed structure to avoid the embossed structure, thereby forming a composite pole piece.

[0040] The electrode composite method provided in the embodiment of the present application can produce an embossed structure on the first electrode, and use a composite roller group to avoid the embossed structure, so that the embossing can remain on the composite electrode without being flattened. In this way, after winding, the composite electrode can maintain the gap between the electrode sheets through the embossed structure, solving problems such as lithium plating, and is conducive to maintaining good cycle performance of the battery cell.

[0041] An embodiment of the third aspect of the present application proposes a composite pole piece, which is manufactured using the pole piece composite method described in the second aspect.

[0042] The composite electrode provided in the embodiment of the present application can maintain the gap between the electrode pieces after winding, thereby reducing problems such as lithium plating.

[0043] An embodiment of the fourth aspect of the present application provides a battery, comprising the composite electrode provided by the third aspect.

[0044] An embodiment of the fifth aspect of the present application provides an electrical device, comprising the battery provided in the fourth aspect, and the battery is used to provide electrical energy.

[0045] 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

[0046] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments or conventional technical descriptions. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0047] FIG1 is a schematic structural diagram of a pole piece composite device provided in one embodiment of the present application;

[0048] FIG2 is a schematic structural diagram of an embossing roller assembly provided in one embodiment of the present application;

[0049] FIG3 is a schematic structural diagram of a composite roller assembly provided in one embodiment of the present application;

[0050] FIG4 is a schematic structural diagram of a first embossing roller provided in another embodiment of the present application;

[0051] FIG5 is a schematic structural diagram of a pole piece composite device provided by another embodiment of the present application;

[0052] FIG6 is a schematic structural diagram of an embossing roller assembly provided in another embodiment of the present application;

[0053] FIG7 is a schematic structural diagram of a composite roller assembly provided in another embodiment of the present application;

[0054] FIG8 is a cross-sectional view of the composite roller assembly shown in FIG7 along line AA;

[0055] FIG9 is a schematic structural diagram of a first pole piece, a second guide roller, and a first composite roller provided in another embodiment of the present application;

[0056] FIG10 is a schematic structural diagram of a first embossing roller provided in another embodiment of the present application;

[0057] FIG11 is a schematic structural diagram of a first embossing roller provided in yet another embodiment of the present application;

[0058] Figure 12 is a cross-sectional view of the first embossing roller shown in Figure 11 along line BB;

[0059] FIG13 is a schematic structural diagram of a first pole piece provided in one embodiment of the present application;

[0060] FIG14 is a schematic structural diagram of a first pole piece provided in another embodiment of the present application;

[0061] FIG15 is a schematic structural diagram of a first pole piece provided in another embodiment of the present application;

[0062] FIG16 is a schematic structural diagram of a first pole piece provided in yet another embodiment of the present application.

[0063] The meanings of the marks in the figure are:

[0064] 100. Pole piece composite device; 10. Embossing roller group; 11. First embossing roller; 111. Embossing pattern; 1111. Bump; 12. Second embossing roller; 13. Press-down drive member; 20. Composite roller group; 21. First composite roller; 211. Avoidance groove; 22. Second composite roller; 30. First feeding roller; 40. Second feeding roller; 50. First guide roller group; 51. First guide roller; 60. Second guide roller group; 61. Second guide roller; 70. First identification device; 80. Second identification device; 200. Composite pole piece; 210. First pole piece; 2101. Embossing structure; 2102. Bump; 2103. Marking; 220. Second pole piece; 230. Diaphragm. Modes for Carrying Out the Invention

[0065] 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.

[0066] 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.

[0067] 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.

[0068] 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.

[0069] 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.

[0070] 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).

[0071] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They 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. Therefore, they should not be understood as limitations on the embodiments of the present application.

[0072] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0073] Currently, the production efficiency requirements for power battery cells are becoming increasingly stringent, and the composite winding method has become an important technical means to improve battery cell production efficiency. However, some wound battery cells have the problem of too small gaps between the electrode sheets, which easily squeezes the electrode sheets and causes problems such as cycle expansion and lithium deposition, affecting the cycle performance of the battery cell.

[0074] To solve the problem of too small a gap between the pole pieces, embossing can be formed on the pole pieces during production to maintain the gap between the pole pieces. However, after the embossing is done, the pole pieces need to be laminated by a laminating roller, which can easily flatten the embossing.

[0075] In view of this, the present application provides a pole piece composite device, including an embossing roller group for forming embossing on a first pole piece; a composite roller group, arranged on one side of the embossing roller group, the composite roller group including a first composite roller and a second composite roller arranged opposite each other, the first composite roller and the second composite roller being jointly used to roll the first pole piece, the second pole piece, and the diaphragm to form a composite pole piece, the surface of the first composite roller being recessed with an avoidance groove, the avoidance groove being arranged opposite to the embossing to avoid the embossing. The pole piece composite device can form embossing on the first pole piece through the embossing roller group, and avoid the embossing through the avoidance groove of the composite roller group, so that the embossing on the first pole piece is not rolled after passing through the composite roller group. Therefore, the embossing on the first pole piece can enable the composite pole piece to maintain the pole piece gap after winding, reduce problems such as lithium plating, and improve the cycle performance of the battery cell.

[0076] Referring to Figures 1 to 3 and 13, an embodiment of the first aspect of the present application provides a pole piece composite device 100. The pole piece composite device 100 includes an embossing roller group 10 and a composite roller group 20. The embossing roller group 10 is used to form an embossed structure 2101 on a first pole piece 210; the composite roller group 20 is arranged downstream of the embossing roller group 10, and the composite roller group 20 includes a first composite roller 21 and a second composite roller 22 arranged opposite to each other. The first composite roller 21 and the second composite roller 22 are used together to roll the first pole piece 210, the second pole piece 220 and the diaphragm 230 to form a composite pole piece 200. The surface of the first composite roller 21 is provided with an avoidance groove 211. The avoidance groove 211 is used to avoid the embossed structure 2101 when the first composite roller 21 and the second composite roller 22 are rolling.

[0077] The first electrode sheet 210 can be either a positive electrode sheet or a negative electrode sheet, and the second electrode sheet 220 can be the other of the positive and negative electrode sheets. The positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer coated on the positive electrode current collector; the negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer coated on the surface of the negative electrode current collector; and the separator 230 is located between the positive and negative electrode sheets. The composite electrode sheet 200 can include the first electrode sheet 210, the separator 230, the second electrode sheet 220, and the separator 230 arranged in sequence, that is, the composite electrode sheet 200 is a four-in-one composite electrode sheet 200. It is understood that the composite electrode sheet 200 can also include only one layer of separator 230.

[0078] The embossing roller assembly 10 is provided with an embossing pattern 111. The embossing roller assembly 10 is used to roll the first pole piece 210 to form an embossed structure 2101 on the first pole piece 210 through the embossing pattern 111. The embossed structure 2101 refers to a raised and / or recessed structure formed on the first pole piece 210. In some embodiments, the first pole piece 210 includes a first surface and a second surface disposed opposite each other. The embossed structure 2101 includes a raised structure formed on the first surface and a recessed structure opposite the raised structure formed on the second surface. In other embodiments, the first pole piece 210 is provided with a raised structure on only one side or on both sides.

[0079] The composite roller group 20 is located downstream of the embossing roller group 10. That is, in the manufacturing process, the first electrode sheet 210 is conveyed in the direction of passing through the embossing roller group 10 first and then through the composite roller group 20. The composite roller group 20 includes a first composite roller 21 and a second composite roller 22 arranged opposite each other. The first composite roller 21 is used to laminate the first electrode sheet 210, and the second composite roller 22 is used to laminate the second electrode sheet 220 or the diaphragm 230. Thus, the first composite roller 21 and the second composite roller 22 can roll-combine the first electrode sheet 210, the second electrode sheet 220, and the diaphragm 230 therebetween. The first composite roller 21 can be an upper composite roller, and the second composite roller 22 can be a lower composite roller, but are not limited thereto.

[0080] The surface of the first composite roller 21 is provided with a recessed escape groove 211. The escape groove 211 is configured to be positioned opposite the embossed structure 2101. Specifically, the projection of the escape groove 211 on the first electrode sheet 210 coincides with the embossed structure 2101. As shown in FIG3 , the embossed structure 2101 is spaced apart from the bottom of the escape groove 211. It will be appreciated that if the embossed structure 2101 is a protruding structure facing the first composite roller 21, the embossed structure 2101 can be accommodated within the escape groove 211. If the embossed structure 2101 is a protruding structure facing the second electrode sheet 220, the embossed structure 2101 still remains positioned opposite the escape groove 211.

[0081] As shown in Figures 2, 3 and 13, the first pole piece 210 is provided with a plurality of embossed structures 2101, and the first composite roller 21 is provided with a plurality of avoidance grooves 211, each of which can avoid a corresponding embossed structure 2101. It is understood that the number of avoidance grooves 211 can also be one.

[0082] During use, the embossing roller assembly 10 embosses the first electrode sheet 210 to form an embossed structure 2101 on the first electrode sheet 210. Subsequently, the first electrode sheet 210, the second electrode sheet 220, and the diaphragm 230 are all transferred to the composite roller assembly 20. The first composite roller 21 is bonded to the first electrode sheet 210, and the second composite roller 22 is bonded to the second electrode sheet 220 or the diaphragm 230. The avoidance groove 211 on the first composite roller 21 is arranged opposite to the embossed structure 2101, and the remaining area of ​​the first composite roller 21 can be rolled to the area of ​​the first electrode sheet 210 other than the embossed structure 2101. After the rolling process by the composite roller assembly 20, the first electrode sheet 210, the second electrode sheet 220, and the diaphragm 230 form a composite electrode sheet 200, and the embossed structure 2101 is retained on the first electrode sheet 210. The composite electrode 200 can be subsequently wound to form a battery cell. The embossed structure 2101 on the first electrode 210 can be used to maintain the gap between the electrode sheets, so that the battery cell is not prone to problems such as lithium deposition.

[0083] The electrode composite device 100 provided in the embodiment of the present application includes an embossing roller group 10 and a composite roller group 20. The electrode composite device 100 can form an embossed structure 2101 on the first electrode 210 through the embossing roller group 10, and roll-compound the first electrode 210, the second electrode 220 and the diaphragm 230 through the composite roller group 20. The avoidance groove 211 on the composite roller group 20 can avoid the embossed structure 2101, so that the embossed structure 2101 on the first electrode 210 is not rolled after passing through the composite roller group 20, so that the embossed structure 2101 on the first electrode 210 can enable the composite electrode 200 to maintain the electrode gap after winding. Therefore, the above-mentioned electrode composite device 100 can produce the composite electrode 200 and enable the composite electrode 200 to maintain the electrode gap after winding, reduce problems such as lithium plating, and improve the cycle performance of the battery cell.

[0084] In some embodiments, the second pole piece 220 may also be provided with an embossed structure, and the second composite roller 22 may also be provided with an avoidance groove 211 corresponding to the embossed structure.

[0085] As shown in Figure 2, the embossing roller group 10 includes a first embossing roller 11 and a second embossing roller 12 arranged opposite to each other. A gap is provided between the first embossing roller 11 and the second embossing roller 12 for the first pole piece 210 to pass through. The surface of at least one of the first embossing roller 11 and the second embossing roller 12 is provided with an embossing pattern 111.

[0086] The embossed pattern 111 is used to form an embossed structure 2101 on the first electrode piece 210. When forming the embossed structure 2101, the first embossing roller 11 and the second embossing roller 12 clamp the first electrode piece 210. When the first electrode piece 210 is driven, the first electrode piece 210 can pass through the gap between the first embossing roller 11 and the second embossing roller 12. The first embossing roller 11 and the second embossing roller 12 can rotate with the movement of the first electrode piece 210. When the first electrode piece 210 passes through the gap between the first embossing roller 11 and the second embossing roller 12, embossing can be formed on one or both surfaces of the electrode piece.

[0087] In some embodiments, the first embossing roller 11 is an upper embossing roller, and the second embossing roller 12 is a lower embossing roller. The surface of the first embossing roller 11 is provided with an embossed pattern 111, while the second embossing roller 12 is not provided with an embossed pattern 111. In this way, after the first electrode sheet 210 passes through the embossing roller assembly 10, the embossed raised structures are all located on the same side of the first electrode sheet 210. Optionally, the second embossing roller 12 may also be provided with an embossed pattern 111. In another embodiment, the first embossing roller 11 provided with the embossed pattern 111 may also be a lower embossing roller.

[0088] By adopting the above technical solution, the embossing roller assembly 10 can form an embossing structure 2101 on at least one side of the first pole piece 210 .

[0089] As shown in Figures 2 to 3 and Figure 13, in some embodiments, the surface of the first embossing roller 11 is provided with multiple embossing lines 111 at intervals to form multiple embossing structures 2101 on the first pole piece 210, and the surface of the first composite roller 21 is provided with multiple avoidance grooves 211 at intervals to avoid the multiple embossing structures 2101.

[0090] The surface of the first embossing roller 11 is provided with a plurality of embossed lines 111 at intervals. After the first electrode sheet 210 passes through the first embossing roller 11, a plurality of embossed structures 2101 are formed on the first electrode sheet 210, i.e., a zebra-shaped embossing is formed on the first electrode sheet 210. Accordingly, to avoid the plurality of embossed structures 2101 on the first electrode sheet 210, the surface of the first composite roller 21 is provided with a plurality of avoidance grooves 211 at intervals, each of which is used to avoid at least one embossed structure 2101. Optionally, the number of embossed lines 111 is equal to the number of avoidance grooves 211, but it is understood that the number of the two may also be different.

[0091] Optionally, the second embossing roller 12 is not provided with embossing patterns, and the second composite roller 22 is not provided with avoidance grooves.

[0092] By adopting the above technical solution, the first embossing roller 11 can form a zebra-shaped embossing on the first pole piece 210, and the multiple avoidance grooves 211 on the first composite roller 21 can respectively avoid the multiple embossing structures 2101, so that the multiple embossing structures 2101 on the composite pole piece 200 can be retained, which is conducive to uniformly maintaining the gap between the pole pieces.

[0093] The embossed structure 2101 may protrude toward or away from the second pole piece 220. As shown in FIG2 , in some embodiments, each embossed pattern 111 includes a plurality of spaced-apart protrusions 1111 ; as shown in FIG4 , in other embodiments, the embossed pattern 111 is a continuous raised strip.

[0094] Referring to Figure 2 , each embossed pattern 111 includes a plurality of protrusions 1111 , which may be arranged in an array, such as a honeycomb pattern. The cross-section of the protrusions 1111 may be circular, elliptical, or polygonal, wherein the polygons may be triangles, quadrilaterals, pentagons, hexagons, or irregular polygons. The protrusions 1111 in each embossed pattern 111 may have the same or different shapes.

[0095] Referring to FIG. 4 , the embossed pattern 111 may also be in the shape of a convex strip, that is, the embossed pattern 111 is a convex strip convexly provided on the surface of the first embossing roller 11 .

[0096] By adopting the above technical solution, the shape of the embossed pattern 111 can be selected according to needs, and a certain gap can be maintained between the pole pieces.

[0097] As shown in FIG. 2 to FIG. 4 , in some embodiments, the embossing lines 111 extend along the circumference of the first embossing roller 11 , and the avoidance grooves 211 extend along the circumference of the first composite roller 21 .

[0098] During use, the first electrode sheet 210 moves along its length direction L and the first embossing roller 11 rotates, so that the embossed lines 111 can form an embossed structure 2101 on the first electrode sheet 210 that extends along the length direction L of the first electrode sheet 210. When there are multiple embossed lines 111, multiple parallel and spaced embossed structures 2101 are formed on the first electrode sheet 210.

[0099] The avoidance groove 211 extends along the circumference of the first composite roller 21. That is, the avoidance groove 211 is an annular groove disposed around the circumference of the first composite roller 21. During use, as the first pole piece 210 moves along its length L and the first composite roller 21 rotates, the annular avoidance groove 211 always avoids the embossed structure 2101, preventing the embossed structure 2101 from being rolled.

[0100] The embossed pattern 111 and the avoidance groove 211 may be annular. It is understood that the embossed pattern 111 and / or the avoidance groove 211 may also be arc-shaped.

[0101] By adopting the above technical solution, the pole piece composite device 100 can form an embossed structure 2101 extending along the length direction L of the first pole piece 210 on the first pole piece 210 and can avoid rolling the embossed structure 2101 .

[0102] In some embodiments, the width of the avoidance groove 211 is greater than or equal to the width of the embossed pattern 111 .

[0103] Since both the embossed pattern 111 and the avoidance groove 211 are arranged around the axial direction of the roller, the width of the embossed pattern 111 refers to the width of the embossed pattern 111 along the axial direction of the first embossing roller 11, and the width of the avoidance groove 211 refers to the width of the avoidance groove 211 along the axial direction of the first composite roller 21. In this way, the avoidance groove 211 can provide sufficient avoidance space for the embossed structure 2101.

[0104] Referring to Figures 5 to 12, other embodiments of the present application provide a pole piece composite device 100, including an embossing roller group 10 and a composite roller group 20. The embossing roller group 10 includes a first embossing roller 11 and a second embossing roller 12 that are relatively arranged. The composite roller group 20 includes a first composite roller 21 and a second composite roller 22 that are relatively arranged. In this embodiment, the embossing pattern 111 extends along the axial direction of the first embossing roller 11, and the avoidance groove 211 extends along the axial direction of the first composite roller 21.

[0105] The embossed pattern 111 extends along the axial direction of the first embossing roller 11. During the embossing process, the first pole piece 210 passes between the first embossing roller 11 and the second embossing roller 12. The embossed pattern 111 can produce an embossed structure 2101 on the first pole piece 210. The embossed structure 2101 extends along the width direction W of the first pole piece 210.

[0106] The embossed line 111 may be one or more. When there are multiple embossed lines 111, the multiple embossed lines 111 are arranged at circumferential intervals around the first embossing roller 11, and multiple embossed structures 2101 can be formed on the pole piece, and the multiple embossed structures 2101 are distributed at intervals along the length direction L of the first pole piece 210, that is, zebra-shaped embossing is formed.

[0107] The avoidance groove 211 extends along the axial direction of the first composite roller 21, so that the avoidance groove 211 can avoid the embossed structure 2101 on the first pole piece 210. When there are multiple embossed lines 111, there can be multiple avoidance grooves 211, and the multiple avoidance grooves 211 are arranged at intervals along the circumference of the first composite roller 21. As shown in Figures 7 and 8, when the first pole piece 210 moves between the first composite roller 21 and the second composite roller 22, the first composite roller 21 rotates, and the avoidance groove 211 of the first composite roller 21 can be arranged corresponding to the embossing to avoid the embossed structure 2101. The remaining area of ​​the first composite roller 21 can be pressed against the area of ​​the first pole piece 210 where the embossed structure 2101 is not provided. Therefore, the area of ​​the first pole piece 210 other than the embossed structure 2101 can be composited with the second pole piece 220, thereby increasing the composite area.

[0108] By adopting the above-mentioned technical solution, the electrode composite device 100 can produce an embossed structure 2101 extending along the width direction W of the first electrode 210 and avoid the embossed structure 2101 being rolled by the composite roller group 20. Other areas of the first electrode 210 can be composited with the second electrode 220, thereby increasing the composite area of ​​the electrode. The first electrode 210, the second electrode 220 and the diaphragm 230 are not easy to separate to avoid undesirable phenomena such as wrinkling during rolling.

[0109] In some embodiments, the arc length of the avoidance groove 211 is greater than or equal to the arc length of the embossed pattern 111 .

[0110] The avoidance groove 211 and the embossed pattern 111 both extend along the axial direction of the roller, and the widths of the avoidance groove 211 and the embossed pattern 111 both extend along the circumference of the roller. The arc length of the avoidance groove 211 is greater than or equal to the arc length of the embossed pattern 111, so that the arc length of the avoidance groove 211 is greater than or equal to the width of the embossing.

[0111] By adopting the above technical solution, the embossed structure 2101 produced by the embossed pattern 111 can completely correspond to the avoidance groove 211 , so that the embossed structure 2101 is not easily rolled by the first composite roller 21 and the second composite roller 22 .

[0112] In other embodiments, the embossed pattern 111 may also be tilted relative to the axial direction of the first embossing roller 11, so that the embossed structure 2101 on the first pole piece is tilted relative to the width direction W of the first pole piece 210; accordingly, the avoidance groove 211 may also be tilted relative to the axial direction of the first composite roller 21.

[0113] Please refer to Figures 5 to 9. In some embodiments, the electrode composite device 100 also includes a first identification device 70 and a second identification device 80 for respectively identifying the mark 2103 on the first electrode 210. The first identification device 70 is arranged upstream of the embossing roller group 10 along the conveying direction of the first electrode 210, and the first embossing roller 11 can press down the first electrode 210 according to the identification information of the first identification device 70; the second identification device 80 is arranged upstream of the composite roller group 20 along the conveying direction of the first electrode 210, and the first composite roller 21 can rotate according to the identification information of the second identification device 80 to adjust the position of the avoidance groove 211, thereby pressing down the first electrode 210, the first electrode 210 and the diaphragm 230.

[0114] The mark 2103 on the first electrode sheet 210 can be a groove, a protrusion, a through hole, a pattern, or other structures. The first recognition device 70 and the second recognition device 80 can be various devices capable of recognizing the mark 2103, such as a sensor, a camera, etc. The first recognition device 70 is disposed upstream of and adjacent to the embossing roller assembly 10. When the first recognition device 70 recognizes the mark 2103, a program calculates the distance from the mark 2103 to the starting electrode sheet embossing position. The first embossing roller 11 then presses down the first electrode sheet 210 from the preset starting electrode sheet embossing position to produce the embossing.

[0115] The second recognition device 80 is capable of recognizing the identifier 2103 and can be positioned adjacent to the composite roller assembly 20. The first composite roller 21 rotates based on the recognition information from the second recognition device 80 to adjust the position of the avoidance grooves 211 on the first composite roller 21, such that the embossed structures 2101 spaced apart along the length of the first pole piece 210 fit neatly within the avoidance grooves 211. As the first composite roller 21 rotates, the remaining avoidance grooves 211 on the first composite roller 21 can align with the embossed structures 2101, ensuring that the embossed structures 2101 are clear of the first composite roller 210.

[0116] By setting the first identification device 70 and the second identification device 80, the first embossing roller 11 can produce an embossing structure 2101 extending along the width direction W of the first electrode 210 at a preset position of the first electrode 210, and the first composite roller 21 can accurately avoid the embossing structure 2101 to avoid rolling the embossing structure 2101.

[0117] As shown in FIG. 9 and FIG. 14 , in some embodiments, the mark 2103 is a groove provided on one side of the first pole piece 210 along the width direction of the first pole piece 210 .

[0118] The groove is used as the mark 2103, which is simple to manufacture and easy to identify. The edge of the first pole piece 210 is usually not coated with the active material layer. The mark 2103 is set as a groove on one side of the first pole piece 210. The groove does not reduce the coating amount of the active material layer.

[0119] It can be understood that the first pole piece 210 is a strip-shaped piece, and the multiple marks 2103 can be distributed at intervals along the extension direction of the first pole piece 210 .

[0120] In some embodiments, each embossed line 111 is continuously provided, or each embossed line 111 is divided into multiple sections along its extending direction.

[0121] 2 , 4 and 6 , the embossed lines 111 on the first embossing roller 11 may extend along the circumferential or axial direction of the first embossing roller 11 ; each embossing line 111 is continuously arranged to form a corresponding continuous embossing structure 2101 on the first electrode 210 .

[0122] Please refer to Figures 10 and 15. Each embossed pattern 111 is divided into multiple segments along its extension direction. For example, each embossed pattern 111 is divided into 2 segments, 3 segments, 4 segments, etc. along its extension direction. The extension lengths of two adjacent segments can be equal or different. Taking Figures 10 and 15 as an example, the embossed pattern 111 extends along the axial direction of the first embossing roller 11. Each embossed pattern 111 is divided into 2 segments along its extension direction. The blank portion between the 2 segments is the surface of the first embossing roller 11. Correspondingly, an embossed structure 2101 extending along its width direction can be formed on the first pole piece 210, and each embossed structure 2101 is divided into 2 segments. At this time, the 2 segments of the embossed structure 2101 can be symmetrical along the width direction of the first pole piece 210, which is conducive to maintaining the uniformity of the pole piece gap.

[0123] By adopting the above technical solution, the first embossing roller 11 can produce a continuous or discontinuous embossing structure 2101 on the first pole piece 210 , both of which can enable the composite pole piece 200 to maintain the gap between the pole pieces after winding.

[0124] As shown in FIG. 10 , in each embossed pattern 111 , the distance d1 between two adjacent patterns is 10 to 20 microns.

[0125] The portion between two adjacent lines will not produce an embossed structure 2101 on the first electrode 210. Therefore, during compounding, the blank portion in each embossed structure 2101 of the first electrode 210 can still be compounded with the second electrode 220, which is beneficial to increasing the compounding area.

[0126] By adopting the above technical solution, the spacing between two adjacent sections of lines can be reasonably set, which will neither affect the effect of maintaining the gap of the electrode due to excessive spacing, nor significantly reduce the composite area and composite effect of the electrode due to excessive spacing.

[0127] In some embodiments, the plurality of embossed lines 111 are distributed at equal intervals.

[0128] Referring to Figure 10 , multiple embossed lines 111 are spaced apart along the circumference of the first embossing roller 11. d2 and d3 respectively indicate the spacing between two adjacent embossed lines 111. d2 may be equal to d3. In other embodiments, d2 may be greater than or less than d3. It is understood that the widths of the multiple embossed lines 111 may be equal or unequal.

[0129] By adopting the above technical solution, the width and spacing of the embossed lines 111 can be flexibly set, and both can enable the composite pole piece 200 to maintain the pole piece gap after winding.

[0130] In some embodiments, the distance between two adjacent embossed lines 111 is 10-15 microns.

[0131] As shown in Figure 10, 10μm≤d2≤15μm, 10μm≤d3≤15μm. For the embossed patterns 111, if the spacing between adjacent embossed patterns 111 is too large, the embossed area on the first electrode 210 will be small, which is not conducive to maintaining the electrode gap; if the spacing between adjacent embossed patterns 111 is too small, the composite area of ​​the first electrode 210 and the second electrode 220 will be small, which may cause the first electrode 210, the second electrode 220, and the diaphragm 230 to separate. It can be understood that the range given above is only the preferred size in actual production, of course, it is not limited to this, and can be appropriately changed according to specific circumstances.

[0132] By adopting the above technical solution, the first embossing roller 11 can produce an embossing structure 2101 with a reasonable area on the first pole piece 210 .

[0133] In some embodiments, the embossed pattern 111 extends along the axial direction of the first embossing roller 11. Please refer to Figures 2 and 6 to 15. Each embossed pattern 111 includes a plurality of protrusions 1111. The cross-section of the protrusions 1111 is circular, elliptical or polygonal. Please refer to Figures 4, 11 and 12. The embossed pattern 111 may also be in the form of convex strips.

[0134] 2 and 6 , in some embodiments, the embossing roller assembly 10 further includes a downward pressing driving member 13 , which is connected to the first embossing roller 11 and is used to drive the first embossing roller 11 to move up and down.

[0135] The downward driving member 13 may be a cylinder or other driving member capable of driving the first embossing roller 11 to move up and down. The lifting of the first embossing roller 11 means that the first embossing roller 11 can move toward or away from the second embossing roller 12.

[0136] By providing a downward driving member 13, the embossing roller assembly 10 can control the first embossing roller 11 to press downward, thereby forming embossed structures 2101 of different heights on the first pole piece 210. Optionally, the height of the embossed structure 2101 can be 10 to 100 microns. It is understood that the height of the embossed structure 2101 can also be set according to needs.

[0137] Please refer to Figures 1 and 5. In some embodiments, the electrode sheet composite device 100 also includes a first loading roller 30 and a second loading roller 40. The first loading roller 30 is arranged on one side of the embossing roller group 10 and is used to provide the first electrode sheet 210. The second loading roller 40 is arranged on one side of the composite roller group 20 and is used to transfer the second electrode sheet 220 and the diaphragm 230 to the composite roller group 20.

[0138] The first feeding roller 30 can be used to wind the strip-shaped first electrode sheet 210 so that the first electrode sheet 210 can be transferred to the embossing roller group 10; the second feeding roller 40 can be arranged flush with the second composite roller 22. The second feeding roller 40 can directly transfer the stacked second electrode sheet 220 and the separator 230 to the composite roller group 20, or the second feeding roller 40 can also transfer the stacked second electrode sheet 220 and the separator 230 to the composite roller group 20 through other rollers. In some embodiments, the second electrode sheet 220 and the separators 230 on both sides of the second feeding roller 40 have been pre-compounded. It can be understood that the second electrode sheet 220 and the separator 230 can also be fed separately and transferred to the composite roller group 20.

[0139] By adopting the above technical solution, the pole piece composite device 100 can realize loading, embossing and rolling composite in an integrated manner, and has high manufacturing efficiency.

[0140] Please continue to refer to Figures 1 and 5. In some embodiments, the electrode composite device 100 also includes a first guide roller group 50 and a second guide roller group 60. The first guide roller group 50 is arranged between the first loading roller 30 and the embossing roller group 10 along the conveying direction of the first electrode 210, and the second guide roller group 60 is arranged between the embossing roller group 10 and the composite roller group 20 along the conveying direction of the first electrode 210.

[0141] The first guide roller group 50 includes one or more first guide rollers 51 arranged in sequence along the electrode sheet conveying direction. The first guide rollers 51 can adjust the direction of the first electrode sheet 210. The first guide roller group 50 is used to convey the first electrode sheet 210 provided by the first feeding roller 30 to the embossing roller group 10. The second guide roller group 60 includes one or more second guide rollers 61 arranged along the electrode sheet conveying direction. The second guide roller group 60 is used to convey the embossed first electrode sheet 210 to the composite roller group 20. The second guide rollers 61 can adjust the direction of the first electrode sheet 210. It is understood that the first guide roller group 50 and the second guide roller group 60 can also adjust the tension of the first electrode sheet 210.

[0142] By adopting the above technical solution, the electrode assembly device 100 can adjust the direction of the first electrode 210 so that the first electrode 210 can be loaded, embossed and assembled in one process.

[0143] Please refer to Figures 1 to 16. An embodiment of the second aspect of the present application proposes a pole piece composite method. The pole piece composite method adopts the pole piece composite device 100 of the first aspect. The pole piece composite method includes: forming an embossing structure 2101 on the first pole piece 210 by an embossing roller group 10; composite the first pole piece 210, the second pole piece 220 and the diaphragm 230 by a composite roller group 20, and the avoidance groove 211 is opposite to the embossing structure 2101 to avoid the embossing structure 2101 to form a composite pole piece 200.

[0144] Among them, the embossing roller group 10 first forms an embossed structure 2101 on the first electrode piece 210, and then the first electrode piece 210 with embossing is transferred to the composite roller group 20, and the composite roller group 20 composites the first electrode piece 210, the second electrode piece 220 and the diaphragm 230. The embossing structure 2101 of the first electrode piece 210 is arranged corresponding to the avoidance groove 211 on the first composite roller 21, so that the composite roller group 20 will not roll the embossed structure 2101.

[0145] Optionally, during the composite process, the first electrode piece 210 , the diaphragm 230 , the second electrode piece 220 and the diaphragm 230 are stacked in sequence to form a four-in-one composite electrode piece 200 . The diaphragm 230 may also be a layer and disposed between the first electrode piece 210 and the second electrode piece 220 .

[0146] The electrode composite method provided in the embodiment of the present application can produce an embossed structure 2101 on the first electrode 210, and use the composite roller group 20 to avoid the embossed structure 2101, so that the embossed structure 2101 can remain on the composite electrode 200 without being flattened. In this way, the composite electrode 200 can maintain the gap between the electrodes through embossing after winding, solves problems such as lithium plating, and is beneficial to maintaining good cycle performance of the battery cell.

[0147] In some embodiments, there are multiple embossed structures 2101 , and the embossed structures 2101 extend along the length direction or the width direction of the first pole piece 210 .

[0148] As shown in Figures 2 to 3 and 13, the embossed patterns 111 on the first embossing roller 11 are arranged around the axial direction of the first embossing roller 11, and the multiple embossing structures 2101 extend along the length direction of the first pole piece 210; as shown in Figures 6 to 16, the embossing patterns 111 on the first embossing roller 11 extend along the axial direction of the first embossing roller 11, and the multiple embossing structures 2101 extend along the width direction of the first pole piece 210.

[0149] The electrode composite method provided in the embodiment of the present application can produce a variety of zebra-shaped embossing patterns, all of which can enable the composite electrode 200 to maintain the electrode gap after winding.

[0150] In some embodiments, the embossed structure 2101 includes a plurality of protrusions 2102 , and the cross-section of the protrusions 2102 is circular, elliptical, or polygonal; or, the embossed structure 2101 is in the shape of convex strips.

[0151] As shown in Figures 2 to 3 and Figure 13, the embossed pattern 111 on the first embossing roller 11 includes a plurality of protrusions 1111, and the cross-section of the protrusions 1111 is circular, elliptical or polygonal. Correspondingly, the embossed structure 2101 on the first pole piece 210 includes a plurality of protrusions 2102, and the cross-section of the protrusions 2102 may also be circular, elliptical or polygonal. That is to say, the projection shape of the protrusions 2102 in the thickness direction of the first pole piece 210 is circular, elliptical or polygonal.

[0152] As shown in FIG16 , the embossed patterns 111 on the first embossing roller 11 are in the shape of convex strips, and correspondingly, the embossed structures 2101 on the first pole piece 210 are in the shape of strips.

[0153] By adopting the above technical solution, the electrode composite method can produce embossed structures 2101 of various shapes, all of which can enable the composite electrode 200 to maintain the electrode gap after winding.

[0154] In some embodiments, the embossed structure 2101 protrudes toward or away from the second pole piece 220 .

[0155] As shown in Figures 3, 7 and 8, the embossed structure 2101 protrudes in a direction close to the second pole piece 220, and the embossed structure 2101 can maintain the gap between the first pole piece 210 and the second pole piece 220; in other embodiments, the embossed structure 2101 can also protrude in a direction away from the second pole piece 220, so that the composite pole piece 200 can be wound multiple times to make a battery cell, and the embossed structure 2101 can still maintain the gap between each circle of pole pieces.

[0156] 3 and 7 , an embodiment of the third aspect of the present application provides a composite pole piece 200 . The composite pole piece 200 is manufactured using the pole piece composite method provided in the second aspect.

[0157] The composite electrode 200 includes a composite first electrode 210, a second electrode 220 and a diaphragm 230. The first electrode 210 is provided with an embossed structure 2101, so that the composite electrode 200 can still maintain the gap between the electrodes after winding, reducing problems such as lithium plating.

[0158] The diaphragm 230 can be two layers, and the first pole piece 210, the diaphragm 230, the second pole piece 220 and the diaphragm 230 are sequentially arranged. It can be understood that the diaphragm 230 can be a single layer and arranged between the first pole piece 210 and the second pole piece 220.

[0159] An embodiment of the fourth aspect of the present application provides a battery, comprising the composite electrode 200 provided in the third aspect.

[0160] The battery includes a housing and a battery cell contained in the housing. The battery cell includes a battery core, which is formed by winding a composite electrode sheet 200. The battery core can be cylindrical, flat, rectangular or other shapes.

[0161] An embodiment of the fifth aspect of the present application provides an electrical device, comprising a battery as provided in the fourth aspect, wherein the battery is used to provide electrical energy.

[0162] Electrical devices may include, but are not limited to, mobile phones, tablets, laptops, electric toys, electric tools, battery-powered vehicles, electric cars, ships, spacecraft, etc. Electric toys may include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft may include airplanes, rockets, space shuttles, and spacecraft, etc.

[0163] Referring to Figures 1 to 16, some embodiments of the present application provide a pole piece composite device 100, comprising an embossing roller group 10 and a composite roller group 20. The embossing roller group 10 comprises a first embossing roller 11 and a second embossing roller 12 disposed opposite to each other, the surface of the first embossing roller 11 being provided with a plurality of embossed lines 111 at intervals, the embossed lines 111 being used to form an embossed structure 2101 on a first pole piece 210; the composite roller group 20 comprises a first composite roller 21 and a second composite roller 22 disposed opposite to each other, the surface of the first composite roller 21 being provided with a plurality of avoidance grooves 211 at intervals, the avoidance grooves 211 being used to be disposed opposite to the embossed structure 2101 to avoid the embossed structure 2101. Optionally, each embossing line 111 comprises a plurality of convex points 1111, or the embossing line 111 is in the form of a convex strip; the embossing line 111 is disposed around the axial direction of the first embossing roller 11, or the embossing line 111 extends along the axial direction of the first embossing roller 11. The electrode assembly device 100 can manufacture the composite electrode 200 and maintain the electrode gap after the composite electrode 200 is wound, thereby reducing problems such as lithium plating and improving the cycle performance of the battery cell.

[0164] 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 composite device, characterized in that: include An embossing roller group, used for forming an embossing structure on the first pole piece; A composite roller group is arranged downstream of the embossing roller group, and the composite roller group includes a first composite roller and a second composite roller arranged opposite to each other, and the first composite roller and the second composite roller are used together to roll the first pole piece, the second pole piece and the diaphragm to form a composite pole piece, and an avoidance groove is recessed on the surface of the first composite roller, and the avoidance groove is used to avoid the embossing structure when the first composite roller and the second composite roller are rolling.

2. The electrode composite device according to claim 1, characterized in that: The embossing roller group includes a first embossing roller and a second embossing roller arranged opposite to each other, a gap is provided between the first embossing roller and the second embossing roller for the first pole piece to pass through, and an embossing pattern is provided on the surface of at least one of the first embossing roller and the second embossing roller.

3. The pole piece composite device according to claim 2, characterized in that: A plurality of embossing lines are arranged at intervals on the surface of the first embossing roller to form a plurality of embossing structures on the first pole piece, and a plurality of avoidance grooves are arranged at intervals on the surface of the first composite roller to avoid the plurality of embossing structures.

4. The pole piece composite device according to claim 2 or 3, characterized in that: The embossing pattern extends along the circumference of the first embossing roller, and the avoidance groove extends along the circumference of the first composite roller.

5. The pole piece composite device according to any one of claims 2 to 4, characterized in that: The width of the avoidance groove is greater than or equal to the width of the embossed pattern.

6. The pole piece composite device according to claim 2 or 3, characterized in that: The embossing pattern extends along the axial direction of the first embossing roller, and the avoidance groove extends along the axial direction of the first composite roller.

7. The pole piece composite device according to claim 6, characterized in that: The arc length of the avoidance groove is greater than or equal to the arc length of the embossed pattern.

8. The pole piece composite device according to claim 6 or 7, characterized in that: The electrode sheet composite device also includes a first identification device and a second identification device, respectively used to identify the markings on the first electrode sheet. The first identification device is arranged upstream of the embossing roller group along the conveying direction of the first electrode sheet, and the embossing roller can press down the first electrode sheet according to the identification information of the first identification device; the second identification device is arranged upstream of the composite roller group along the conveying direction of the first electrode sheet, and the first composite roller can rotate according to the identification information of the second identification device to adjust the position of the avoidance groove.

9. The pole piece composite device according to claim 8, characterized in that: The mark is a groove provided on one side of the first pole piece along the width direction of the first pole piece.

10. The pole piece composite device according to any one of claims 1 to 9, characterized in that: The embossed structure protrudes in a direction close to or away from the second pole piece; Wherein, each of the embossed lines comprises a plurality of convex points arranged at intervals, or The embossed pattern is in the shape of continuous raised convex strips.

11. The pole piece composite device according to claim 10, characterized in that: Each of the embossed lines is arranged continuously, or each of the embossed lines is divided into multiple sections along its extending direction.

12. The electrode composite device according to claim 11, characterized in that: In each of the embossed lines, the distance between two adjacent lines is 10 to 20 microns.

13. The pole piece composite device according to any one of claims 3 to 9, characterized in that: The plurality of embossed lines are distributed at equal intervals.

14. The pole piece composite device according to any one of claims 3 to 9, characterized in that: The distance between two adjacent embossed lines is 10 to 15 microns.

15. The pole piece composite device according to any one of claims 2 to 9, characterized in that: The embossing roller group further includes a downward pressing driving member, which is connected to the first embossing roller and is used to drive the first embossing roller to rise and fall.

16. A pole piece composite method, characterized in that: The pole piece composite method adopts the pole piece composite device according to any one of claims 1 to 15, and the pole piece composite method comprises: forming an embossing structure on the first pole piece by the embossing roller group; The first pole piece, the second pole piece and the diaphragm are compounded by the compound roller group, and the avoidance groove is opposite to the embossed structure to avoid the embossed structure, so as to form a compound pole piece.

17. A composite pole piece, characterized in that: The electrode assembly method as claimed in claim 16 is used for manufacturing.

18. A battery, characterized in that: Comprising the composite pole piece as claimed in claim 17.

19. An electrical equipment, characterized in that: Comprising a battery as claimed in claim 18, the battery is used to provide electrical energy.

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