Pole piece, coating gasket and coating equipment

Abstract

The utility model relates to the technical field of batteries and production and processing equipment thereof, in particular to a pole piece, a coating gasket and coating equipment, the pole piece comprises a current collector and a coating layer attached to the surface of the current collector, the coating layer comprises an electrode coating area and an insulating glue coating area, and the insulating glue coating area is located at the edge of the electrode coating area; wherein the electrode coating area is provided with a first thinned area, and the insulating glue coating area is provided with a second thinned area; wherein the first thinned area and the second thinned area are oppositely arranged and are in contact, or the first thinned area and the second thinned area are oppositely arranged and are at least partially overlapped, and the width of the overlapped area is smaller than or equal to 0.2 mm.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries and production and processing equipment thereof, in particular to a pole piece, a coating gasket and a coating equipment. Background Art

[0002] In the existing coating process for the coating layer of the battery electrode, when the edge of the electrode slurry coating area of ​​the positive electrode is provided with insulating glue (such as ear glue), the electrode coating and the insulating glue coating are easily melted after being coated at the same time, resulting in poor accuracy of die-cutting positioning and affecting product yield. Utility Model Content

[0003] A main purpose of the utility model is to overcome at least one defect of the above-mentioned prior art and provide a pole piece.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] According to one aspect of the utility model, a pole piece is provided, which includes a current collector and a coating layer attached to the surface of the current collector, the coating layer includes an electrode coating area and an insulating glue coating area, the insulating glue coating area is located at the edge of the electrode coating area; wherein the coating layer is formed by coating via the coating device proposed in the utility model, the electrode coating area has a first thinning area, and the insulating glue coating area has a second thinning area; wherein the first thinning area is arranged opposite to and in contact with the second thinning area, or the first thinning area is arranged opposite to and at least partially overlaps with the second thinning area, and the width of the overlapping area is less than or equal to 0.2 mm.

[0006] It can be seen from the above technical solution that the advantages and positive effects of the pole piece proposed by the utility model are:

[0007] The pole piece proposed in the utility model includes a current collector and a coating layer attached to the surface of the current collector, the coating layer includes an electrode coating area and an insulating glue coating area, and the insulating glue coating area is located at the edge of the electrode coating area. The first thinning area of ​​the electrode coating area and the second thinning area of ​​the insulating glue coating area are arranged relative to each other and at least partially overlap, and the width of the overlapping area is less than or equal to 0.2mm. Through the above-mentioned structural design, the utility model can alleviate or avoid the situation of insulating glue slurry and electrode slurry melting during the coating process, effectively improve the pole piece yield, and at the same time can improve the energy density of the pole piece.

[0008] Another main purpose of the present invention is to overcome at least one of the above-mentioned defects of the prior art and provide a coating gasket that can avoid the occurrence of melting phenomenon.

[0009] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0010] According to another aspect of the utility model, there is provided a coating gasket for being arranged in a coating device, the coating device being used for coating to form a coating layer of the pole piece proposed in the utility model, wherein: the coating gasket comprises a main body and at least two protruding parts, at least two of the protruding parts are protruding from the same side of the main body in a first direction, at least two of the protruding parts are arranged at intervals along a second direction perpendicular to the first direction, so that two adjacent protruding parts and the main body jointly form a first opening with an opening direction in the first direction, the first direction and the second direction are both perpendicular to the thickness direction of the coating gasket; the protruding part is provided with a first through hole and a second opening which pass through in the thickness direction, one end of the second opening is connected to the first through hole, and the other end is open to an edge of a side of the protruding part away from the main body; the part of the protruding part located between the first opening and the second opening forms an isolation part, the side of the isolation part facing the first opening is provided with a first thinning part, and the side of the isolation part facing the second opening is provided with a second thinning part, so that the isolation parts on the two protruding parts of the same first opening are arranged facing each other.

[0011] It can be seen from the above technical solution that the advantages and positive effects of the coated gasket proposed by the utility model are:

[0012] The coating gasket proposed by the utility model includes a main body and at least two protruding parts, at least two protruding parts are extended from the same side of the main body in the first direction, and at least two protruding parts are arranged at intervals along a second direction perpendicular to the first direction, so that two adjacent protruding parts and the main body together form a first opening with an opening direction in the first direction; the protruding part is provided with a first through hole and a second opening, one end of the second opening is connected to the first through hole, and the other end is open to the edge of a side of the protruding part away from the main body; the part of the protruding part located between the first opening and the second opening forms an isolation part, the side of the isolation part facing the first opening is provided with a first thinning part, and the side of the isolation part facing the second opening is provided with a second thinning part, so that the isolation parts on the two protruding parts of the same first opening are arranged facing each other. Through the above-mentioned structural design, the utility model utilizes the first thinning portion to thin the side of the insulating glue opposite to the electrode coating area, so that the thickness of the insulating glue at the contact position with the slurry is greatly reduced. During drying, the thinned side of the insulating glue slurry will be easier to dry due to less slurry, and can be solidified after drying, thereby avoiding deformation due to surface tension and avoiding the insulating glue slurry from melting with the electrode slurry, that is, avoiding the melting phenomenon, improving the accuracy of die-cutting positioning, and ensuring product yield.

[0013] Another main purpose of the present invention is to overcome at least one defect of the above-mentioned prior art and provide a coating device using the above-mentioned coating gasket.

[0014] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0015] According to another aspect of the utility model, a coating device is provided, which includes the coating gasket proposed in the utility model.

[0016] It can be seen from the above technical solution that the advantages and positive effects of the coating equipment proposed by the utility model are:

[0017] The coating equipment proposed in the utility model can avoid the situation where the insulating glue slurry and the electrode slurry are melted by adopting the coating gasket proposed in the utility model, that is, avoid the melting phenomenon, improve the accuracy of die-cutting positioning, and ensure the product yield. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The various objects, features and advantages of the present invention will become more apparent by considering the following detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings. The accompanying drawings are only exemplary illustrations of the present invention and are not necessarily drawn to scale. In the accompanying drawings, the same reference numerals always represent the same or similar parts. Among them:

[0019] Figure 1 and Figure 2 They are respectively schematic plan views of a coating gasket at two different viewing angles according to an exemplary embodiment;

[0020] Figure 3 yes Figure 2 An enlarged schematic diagram of part A in FIG.

[0021] Figure 4 yes Figure 3 An enlarged schematic diagram of part B in FIG.

[0022] Figure 5 yes Figure 4 An enlarged schematic diagram of part C in FIG.

[0023] Figure 6 and Figure 7 They are respectively schematic plan views of a coating gasket at two different viewing angles according to another exemplary embodiment;

[0024] Figure 8 yes Figure 7 An enlarged schematic diagram of part D in FIG.

[0025] Fig. 9 is a schematic diagram of a three-dimensional structure of a coating device according to an exemplary embodiment;

[0026] Fig.10 yes Fig. 9 Side view of

[0027] Fig.11 is a schematic cross-sectional view of a pole piece according to an exemplary embodiment;

[0028] Fig.12 yes Fig.11 An enlarged schematic diagram of part E in FIG.

[0029] The following are the descriptions of the reference numerals:

[0030] 100. Coated gasket;

[0031] 101. First opening;

[0032] 102. First slot;

[0033] 110. Main body;

[0034] 120. Extension;

[0035] 1201. Middle extension;

[0036] 1202. Edge extension;

[0037] 121. A first through hole;

[0038] 122. Second opening;

[0039] 123. Isolation Department;

[0040] 134. The first thinning portion;

[0041] 135. The second thinning part;

[0042] 200. Upper die head;

[0043] 300. Lower die head;

[0044] 410. Current collector;

[0045] 421. Electrode coating area;

[0046] 4211. First skiving zone;

[0047] 422. Insulation glue coating area;

[0048] 4221. Second thinning zone;

[0049] 423. Overlapping area;

[0050] d1~d6.Width;

[0051] d7.Length;

[0052] h1~h2.Thickness;

[0053] X. First direction;

[0054] Y. Second direction;

[0055] Z. Arrangement direction. DETAILED DESCRIPTION

[0056] Typical embodiments that embody the features and advantages of the present invention will be described in detail in the following description. It should be understood that the present invention can have various changes in different embodiments without departing from the scope of the present invention, and the descriptions and drawings therein are essentially for illustrative purposes rather than for limiting the present invention.

[0057] In the following description of different exemplary embodiments of the utility model, reference is made to the accompanying drawings, which form a part of the utility model and in which different exemplary structures, systems and steps that can implement multiple aspects of the utility model are shown by way of example. It should be understood that other specific schemes of components, structures, exemplary devices, systems and steps can be used, and structural and functional modifications can be made without departing from the scope of the utility model. Moreover, although the terms "above", "between", "within", etc. can be used in this specification to describe different exemplary features and elements of the utility model, these terms are used herein only for convenience, such as according to the direction of the examples described in the accompanying drawings. Nothing in this specification should be construed as requiring a specific three-dimensional orientation of the structure to fall within the scope of the utility model.

[0058] See also Fig.11 and Fig.12 , Fig.11 A cross-sectional schematic diagram of the pole piece proposed by the utility model is representatively shown in FIG. Fig.12 A representative example is shown in Fig.11 Schematic diagram of the enlarged portion E in FIG. In this exemplary embodiment, the pole piece proposed by the present invention is described by taking the application to a vehicle-mounted battery as an example. It is easy for a person skilled in the art to understand that in order to apply the relevant design of the present invention to other types of batteries, various modifications, additions, substitutions, deletions or other changes are made to the specific embodiments described below, and these changes are still within the scope of the principle of the pole piece proposed by the present invention.

[0059] like Fig.11 and Fig.12As shown, in one embodiment of the present utility model, the pole piece proposed by the present utility model includes a current collector 410 and a coating layer attached to the surface of the current collector 410, and the coating layer includes an electrode coating area 421 and an insulating glue coating area 422, and the insulating glue coating area 422 is located at the edge of the electrode coating area 421. Among them, the electrode coating area 421 has a first thinning area 4211, and the insulating glue coating area 422 has a second thinning area 4221. On this basis, the first thinning area 4211 and the second thinning area 4221 are arranged relative to each other and at least partially overlap, and the width d3 of the overlapping area 423 is less than or equal to 0.2mm, such as 0.05mm, 0.1mm, 0.2mm, etc. Through the above-mentioned structural design, the utility model can alleviate or avoid the situation of avoiding the melting of the insulating glue slurry and the electrode slurry during the coating process, effectively improve the pole piece yield, and at the same time can improve the energy density of the pole piece.

[0060] Fig.11 and Fig.12 In the illustrated embodiment, the partial overlap between the first thinning zone 4211 and the second thinning zone 4221 is used as an example for explanation. It should be understood that in some embodiments of the utility model, the first thinning zone 4211 and the second thinning zone 4221 may also be arranged relative to each other and contact each other, that is, the orthographic projections of the first thinning zone 4211 and the second thinning zone 4221 on the surface of the current collector 410 may not have an overlapping area 423.

[0061] In one embodiment of the present invention, the electrode sheet provided by the present invention may be a positive electrode sheet, and may further be a ternary positive electrode sheet. In this case, the double-sided surface density of the ternary positive electrode sheet may be greater than or equal to 200 g / m 2 . Through the above design, for the electrode with a higher surface density, the thickness of the electrode coating area 421 is very thick (i.e., thick electrode). During the baking process, the surface of the electrode slurry is easy to dry, but the internal drying is very slow, which will further aggravate the influence of surface tension and cause the melting phenomenon to be more serious. Therefore, the utility model can be more suitable for the application of thick electrodes through the above design, effectively alleviate or avoid the melting phenomenon, and ensure product yield. In some embodiments, when the electrode proposed in the utility model is a positive electrode, the positive electrode may also be other types of positive electrodes. For example, the electrode proposed in the utility model may be a lithium iron phosphate positive electrode. At this time, the double-sided surface density of the lithium iron phosphate positive electrode is greater than or equal to 300g / m 2 For another example, the electrode sheet provided by the present invention may be a lithium iron manganese phosphate positive electrode sheet. In this case, the double-sided surface density of the lithium iron manganese phosphate positive electrode sheet is greater than or equal to 240 g / m 2 .

[0062] like Fig.12As shown, in one embodiment of the present invention, the width d4 of the second thinned area 4221 can account for 1 / 10 to 3 / 5 of the width d5 ​​of the insulating glue coating area 422, such as 1 / 10, 1 / 8, 1 / 5, 2 / 5, 1 / 2, 3 / 5, etc. Through the above structural design, the present invention can avoid the risk of melting caused by the width d4 of the second thinned area 4221 being too small, and can also avoid the situation where the electrode coating area 421 and the insulating glue coating area 422 in some areas are not in contact, that is, the empty foil of the current collector 410 leaks out, which will increase the risk of internal short circuit in the battery. In some embodiments, the width d4 of the second thinned area 4221 can account for less than 1 / 10 of the width d5 ​​of the insulating glue coating area 422, or can be greater than 3 / 5, such as 1 / 11, 2 / 3, etc., and is not limited to this embodiment.

[0063] like Fig.12 As shown, in one embodiment of the present invention, the width d6 of the first skived area 4211 can be 3 mm to 18 mm, such as 3 mm, 5 mm, 10 mm, 18 mm, etc. The width d6 of the first skived area 4211 can be designed accordingly according to the actual required skived width of the coating area. For example, in some embodiments, the width d6 of the first skived area 4211 can also be less than 3 mm, or can be greater than 18 mm, such as 2.9 mm, 19.5 mm, etc., and is not limited to this embodiment.

[0064] like Fig.12 As shown, in one embodiment of the present invention, the width d4 of the second skived area 4221 can be 0.5 mm to 2.5 mm, such as 0.5 mm, 1 mm, 1.5 mm, 2.5 mm, etc. Among them, the width d6 of the first skived area 4211 can be designed accordingly according to the actual required skived width of the coating area. For example, in some embodiments, the width d4 of the second skived area 4221 can also be less than 0.5 mm, or can be greater than 2.5 mm, such as 0.49 mm, 2.6 mm, etc., which is not limited to this embodiment.

[0065] In one embodiment of the utility model, the coating layer of the electrode piece may have two insulating glue coating areas 422, which are located on opposite sides of the electrode coating area 421, and the widths of the second thinning areas 4221 of the two insulating glue coating areas 422 may be different. Through the above structural design, due to the uneven feeding of the electrode slurry, the insulating glue at different positions needs to be thinned to different sizes. On this basis, when using, for example Figure 6 and Figure 7After the coating gasket 100 shown is coated and die-cut for multiple pole pieces simultaneously, the second thinned regions 4221 at both ends of the insulating glue on the obtained single pole piece will present different widths.

[0066] like Fig.12 As shown, based on the structural design of different widths of the second thinned areas 4221 of the two insulating adhesive coating areas 422, in one embodiment of the present invention, the length of the pole piece can be less than 800 mm along the arrangement direction Z of the two insulating adhesive coating areas 422. Through the above structural design, the present invention can avoid the problem of difficulty in coating multiple pole pieces due to the excessive length of the pole piece.

[0067] In one embodiment of the present invention, the thickness h1 of the coating layer in the electrode coating area 421 may be greater than the thickness h2 in the insulating adhesive coating area 422. Through the above structural design, the present invention can optimize the lamination effect between the electrode and the diaphragm, which is beneficial to reduce the internal resistance of the battery.

[0068] It should be noted that the pole pieces shown in the drawings and described in this specification are only a few examples of the many pole pieces that can adopt the principles of the present invention. It should be clearly understood that the principles of the present invention are by no means limited to any details or any components of the pole pieces shown in the drawings or described in this specification.

[0069] In summary, the pole piece proposed in the utility model includes a current collector 410 and a coating layer attached to the surface of the current collector 410, the coating layer includes an electrode coating area 421 and an insulating glue coating area 422, and the insulating glue coating area 422 is located at the edge of the electrode coating area 421. The first thinning area 4211 of the electrode coating area 421 and the second thinning area 4221 of the insulating glue coating area 422 are arranged relatively and at least partially overlapped, and the width d3 of the overlapping area 423 is less than or equal to 0.2mm. Through the above-mentioned structural design, the utility model can alleviate or avoid the situation of the insulating glue slurry and the electrode slurry melting during the coating process, effectively improve the pole piece yield, and at the same time can improve the energy density of the pole piece.

[0070] Based on the above detailed description of several exemplary embodiments of the pole piece proposed in the present invention, several exemplary embodiments of the coated gasket 100 proposed in the present invention will be described below.

[0071] See also Figure 1 and Figure 2 , which respectively represent the planar schematic diagrams of the coated gasket 100 proposed by the utility model at two different viewing angles, for example, the coated gasket 100 has a first surface and a second surface opposite to each other in the thickness direction thereof, and the thickness direction is a direction perpendicular to the drawing, and Figure 1 The first side of the coated gasket 100 is shown in FIG. Figure 2 The second side of the coating gasket 100 is shown. In this exemplary embodiment, the coating gasket 100 proposed by the present invention is described by taking a coating device applied to a pole piece coating as an example. It is easy for a person skilled in the art to understand that in order to apply the relevant design of the present invention to other types of coating devices, various modifications, additions, substitutions, deletions or other changes are made to the specific embodiments described below, and these changes are still within the scope of the principle of the coating gasket 100 proposed by the present invention.

[0072] like Figure 1 and Figure 2 As shown, in one embodiment of the present invention, the coating pad 100 proposed by the present invention is used to be set in a coating device, and the coating device is used to apply the coating layer of the pole piece proposed by the present invention and described in detail in the above embodiment. The coating pad 100 includes a main body 110 and two extensions 120. Figures 3 to 5 , Figure 2 A representative example is shown in Figure 2 An enlarged schematic diagram of part A in FIG. Figure 4 A representative example is shown in Figure 3 An enlarged schematic diagram of part B in FIG. Figure 5 A representative example is shown in Figure 4 The enlarged schematic diagram of the C portion in FIG. The structure, connection mode and functional relationship of each main component of the coating gasket 100 proposed by the utility model will be described in detail below in conjunction with the above drawings.

[0073] like Figures 1 to 4As shown, in one embodiment of the present invention, two extensions 120 are extended from the same side of the main body 110 in the first direction X, and the two extensions 120 are arranged at intervals along the second direction Y perpendicular to the first direction X, so that the two adjacent extensions 120 and the main body 110 jointly form a first opening 101 with the opening direction in the first direction X, and the first direction X and the second direction Y are both perpendicular to the thickness direction of the coating gasket 100. The extension 120 is provided with a first through hole 121 and a second opening 122 that penetrate along the thickness direction, and one end of the second opening 122 is connected to the first through hole 121, and the other end is open to the edge of one side of the extension 120 away from the main body 110. The portion of the extension 120 between the first opening 101 and the second opening 122 forms an isolation portion 123, and a first thinning portion 134 is provided on the side of the isolation portion 123 facing the first opening 101, and a second thinning portion 135 is provided on the side of the isolation portion 123 facing the second opening 122, so that the isolation portions 123 on the two extensions 120 of the same first opening 101 are arranged facing each other. The coating gasket 100 is suitable for being installed in a coating device and used for coating a coating layer on a pole piece, the first opening 101 is suitable for the electrode slurry to flow out, the second opening 122 is suitable for the insulating paste to flow out, the first thinning portion 134 is suitable for thinning the edge of the electrode slurry, and the second thinning portion 135 is suitable for thinning the edge of the insulating paste.

[0074] It should be noted that in the coating process of the electrode sheet, since the electrode slurry and the insulating glue slurry are sprayed onto the current collector 410 through the slit at the opening of the gasket through the die head, the insulating glue slurry is located at the edge of the electrode slurry and in contact with the electrode slurry, and then enters the oven for drying. In the drying process, since the solid content of the insulating glue slurry is lower than that of the electrode slurry, it is more difficult to be dried. A thinning area is provided on the side of the electrode slurry close to the insulating glue slurry, and the thinning area is dried first. The dried thinning area is a rough surface structure. At this time, the wet insulating glue slurry is pulled by the surface tension to migrate to the thinning area of ​​the electrode slurry, thereby causing a melting phenomenon, that is, part of the insulating glue covers the electrode coating area 421. The greater the coating surface density and the faster the coating speed, the more serious the melting phenomenon. The direct adverse effect of the melting is the process yield of the stacking. Since the insulating glue interferes with the edge recognition of the stacking CCD camera, it leads to misjudgment of the stacking size, resulting in the scrapping of the electrode sheet, which reduces the production yield. Furthermore, when the electrode is a positive electrode, due to the presence of the positive electrode melt, the insulating glue covers the positive electrode slurry area, restricting the deintercalation of lithium ions, which will reduce the capacity of the lithium battery. In this regard, the utility model can use the first thinning portion 134 to thin the side of the insulating glue opposite to the electrode coating area 421 through the above-mentioned structural design, so that the thickness of the insulating glue in the position in contact with the slurry is greatly reduced. When drying, the thinned side of the insulating glue slurry will be easier to dry because of less slurry. After drying, it can be solidified to avoid deformation due to surface tension, avoid the situation where the insulating glue slurry melts with the electrode slurry, that is, avoid the melting phenomenon, improve the accuracy of die-cutting positioning, and ensure product yield.

[0075] like Figure 2 and Figure 3 As shown, in one embodiment of the present invention, a first groove 102 is provided on one side surface of the coating gasket 100 in the thickness direction, and the first groove 102 is connected to the first through hole 121, and the first groove 102 is suitable for the insulating slurry to flow into the first through hole 121. The first groove 102 can be a milling groove, or a groove structure processed by other processes. Through the above structural design, the present invention uses the first groove 102 set on the extension 120 to reduce the feed flow of the insulating slurry, and further reduce the glue flow of the insulating slurry, thereby improving the melting effect.

[0076] Based on the structural design that the coating gasket 100 is provided with the first groove 102, in one embodiment of the present invention, the groove depth of the first groove 102 may account for 1 / 4 to 3 / 4 of the thickness of the coating gasket 100, such as 1 / 4, 1 / 3, 1 / 2, 5 / 8, 2 / 3, 3 / 4, etc. Through the above structural design, the present invention can avoid the groove depth of the first groove 102 being too small, which makes the effect of reducing the feed flow rate of the insulating paste material not obvious, and can also avoid the groove depth of the first groove 102 being too large, which affects the structural strength of the coating gasket 100. In some embodiments, the groove depth of the first groove 102 may account for less than 1 / 4 of the thickness of the coating gasket 100, or may be greater than 3 / 4, such as 1 / 5, 4 / 5, etc., which is not limited to the present embodiment.

[0077] like Figure 4 and Figure 5 As shown, in one embodiment of the present invention, a second groove may be provided on one side surface of the coating gasket 100 in the thickness direction, and the second groove is located on the side of the isolation portion 123 facing the first opening 101 and serves as the first thinning portion 134. The second groove has a groove wall only on one side of the isolation portion 123, that is, the second groove is an open structure on the other side. The second groove may be a milling groove or a groove structure processed by other processes. Through the above structural design, the present invention utilizes the second groove provided on the extension portion 120 to block part of the electrode slurry, thereby achieving thinning of the electrode coating area 421.

[0078] like Figure 5 As shown, based on the structural design of the coating gasket 100 with the second groove, in one embodiment of the present utility model, the groove wall of the second groove can be a chamfered structure, such as but not limited to the chamfered structure shown in the drawings. In some embodiments, the groove wall of the second groove can also be a rounded structure or other structures, and the chamfer size and inclination angle of the groove wall can be designed accordingly according to the actual required thinning width and thinning thickness of the electrode coating area 421.

[0079] Based on the structural design that the coating gasket 100 is provided with a second groove, in one embodiment of the present invention, the groove depth of the second groove may account for 1 / 6 to 4 / 5 of the thickness of the coating gasket 100, such as 1 / 6, 1 / 5, 1 / 3, 1 / 2, 3 / 4, 4 / 5, etc. Through the above structural design, the present invention can avoid the groove depth of the second groove being too small so that the thinning of the electrode coating area 421 is not obvious, and can also avoid the groove depth of the second groove being too large so as to affect the structural strength of the coating gasket 100. In some embodiments, the groove depth of the second groove may account for less than 1 / 6 of the thickness of the coating gasket 100, or may be greater than 4 / 5, such as 1 / 7, 5 / 6, etc., and is not limited to this embodiment.

[0080] like Figure 4 and Figure 5 As shown, in one embodiment of the present invention, a third groove may be provided on one side surface of the coating gasket 100 in the thickness direction, and the third groove is located on the side of the isolation portion 123 facing the second opening 122 and serves as the second thinning portion 135. The third groove has a groove wall only on one side of the isolation portion 123, that is, the third groove is an open structure on the other side. The third groove may be a milling groove or a groove structure processed by other processes. Through the above structural design, the present invention utilizes the third groove provided on the extension portion 120 to block part of the insulating adhesive paste, thereby achieving the thinning of the insulating adhesive coating area 422.

[0081] like Figure 5 As shown, based on the structural design of the coating gasket 100 with the third groove, in one embodiment of the present utility model, the end of the groove wall of the third groove away from the main body 110 can be a chamfered structure, such as but not limited to the chamfered structure shown in the figure. In some embodiments, the end of the groove wall of the third groove away from the main body 110 can also be a rounded structure or other structures, and the chamfer size and inclination angle of this part of the groove wall can be designed accordingly according to the actual required thinning width and thinning thickness of the insulating glue coating area 422.

[0082] Based on the structural design of the coating gasket 100 with the third groove, in one embodiment of the present invention, the ratio of the width d1 of the third groove to the width d2 of the second opening 122 can be 1 / 3 to 3 / 1, such as 1 / 3, 1 / 2, 1 / 1, 2 / 1, 3 / 1, etc. Through the above structural design, the present invention can avoid the above ratio being too small so that the thinning area of ​​the insulating glue coating area 422 is not obvious enough, and at the same time avoid the above ratio being too large so that the thinning area of ​​the insulating glue coating area 422 is too large. In some embodiments, the ratio of the width d1 of the third groove to the width d2 of the second opening 122 can also be less than 1 / 3, or can be greater than 3 / 1, such as 1 / 4, 4 / 1, etc., and is not limited to this embodiment.

[0083] Based on the structural design that the coating gasket 100 is provided with the third groove, in one embodiment of the present invention, the depth of the third groove may account for 1 / 6 to 4 / 5 of the thickness of the coating gasket 100, such as 1 / 6, 1 / 5, 1 / 3, 1 / 2, 3 / 4, 4 / 5, etc. Through the above structural design, the present invention can avoid the third groove having too small a depth, which may cause the thinning of the insulating adhesive coating area 422 to be not obvious, and can also avoid the third groove having too large a depth, which may affect the structural strength of the coating gasket 100. In some embodiments, the depth of the third groove may account for less than 1 / 6 of the thickness of the coating gasket 100, or may be greater than 4 / 5, such as 1 / 7, 5 / 6, etc., and is not limited to the present embodiment.

[0084] like Figure 2As shown, when the coated gasket 100 is provided with a first groove 102, and the second groove and the third groove are used as the first thinning portion 134 and the second thinning portion 135 respectively, the first groove 102, the second groove and the third groove can all be opened on the same side surface of the coated gasket 100 in the thickness direction.

[0085] See also Figures 6 to 8 , Figure 6 and Figure 7 Schematic diagrams of the coated gasket 100 provided by the present invention in another exemplary embodiment are respectively and representatively shown in two different viewing angles; Figure 8 A representative example is shown in Figure 8 An enlarged schematic diagram of part D in FIG.

[0086] like Figures 6 to 8 As shown, in one embodiment of the present invention, the coating pad 100 provided by the present invention may include three extensions 120, and the three extensions 120 include two edge extensions 1202 and one middle extension 1201. The two edge extensions 1202 are two extensions 120 located at both ends in the second direction Y, and the middle extension 1201 is located between the two edge extensions 1202, so as to form two first openings 101 arranged at intervals along the second direction Y. On this basis, the middle extension 1201 is provided with two first through holes 121 and two second openings 122, and one end of each of the two second openings 122 is connected to the two first through holes 121, and both sides of the middle extension 1201 in the second direction Y are formed with isolation portions 123. Through the above-mentioned structural design, when the width of the electrode to be coated is smaller than the length of the coating gasket 100 in the second direction Y, the above-mentioned structural design of setting the middle extension part 1201 can be adopted. Accordingly, the utility model can divide the discharge port of the coating gasket 100 into two, so as to realize the simultaneous coating of multiple electrode pieces, which is beneficial to improving the production efficiency of the coating equipment.

[0087] Figure 6 and Figure 7In the illustrated embodiment, the coating gasket 100 includes three extensions 120 and the three extensions 120 include a middle extension 1201. It should be understood that in some embodiments of the present invention, the middle extension 1201 may be two or more arranged at intervals along the second direction Y. In other words, in each exemplary embodiment consistent with the design concept of the present invention, the coating gasket 100 proposed by the present invention may include at least three extensions 120, the at least three extensions 120 include two edge extensions 1202 and at least one middle extension 1201, the two edge extensions 1202 are two extensions 120 located at both ends in the second direction Y, and the remaining extensions 120 located between the two edge extensions 1202 are all middle extensions 1201, thereby forming at least two first openings 101 arranged at intervals along the second direction Y.

[0088] Based on the structural design that the coating gasket 100 includes the middle extension part 1201, in one embodiment of the utility model, the width of the second thinning part 135 (for example, the width of the third groove) provided in the middle extension part 1201 can be greater than the width of the second thinning part 135 (for example, the width of the third groove) provided in the edge extension part 1202, so that for two adjacent pole pieces (one of which is the pole piece at the edge) in a coating process, the thinning width of the electrode coating area 421 of one pole piece located at the edge close to the other pole piece is larger than that of the other thinning area far from the other pole piece. Through the above structural design, since the feed port for the electrode slurry to enter the die head is located in the middle position in the length direction of the die head, the flow rate of the electrode slurry in the middle area is larger than that of the two sides, so the electrode slurry in the middle area is more cast toward the side of the insulating glue after thinning, and the risk of melting is also higher. In this regard, the utility model adopts the above structural design, which can further reduce the discharge of the insulating glue in the middle position and meet the greater need for the thinning width in the middle position.

[0089] It should be noted here that the coated gasket 100 shown in the drawings and described in this specification is only a few examples of many kinds of coated gaskets 100 that can adopt the principles of the present invention. It should be clearly understood that the principles of the present invention are by no means limited to any details or any components of the coated gasket 100 shown in the drawings or described in this specification.

[0090] In summary, the coating gasket 100 proposed by the utility model includes a main body 110 and at least two protruding parts 120, at least two protruding parts 120 are extended from the same side of the main body 110 in the first direction X, and at least two protruding parts 120 are arranged at intervals along a second direction Y perpendicular to the first direction X, so that two adjacent protruding parts 120 and the main body 110 jointly form a first opening 101 with an opening direction in the first direction X; the protruding part 120 is provided with a first through hole 121 and a second opening 122, and the second opening One end of the opening 122 is connected to the first through hole 121, and the other end is open to the edge of the side of the extension portion 120 away from the main body 110; the part of the extension portion 120 located between the first opening 101 and the second opening 122 forms an isolation portion 123, and a first thinned portion 134 is provided on the side of the isolation portion 123 facing the first opening 101, and a second thinned portion 135 is provided on the side of the isolation portion 123 facing the second opening 122, forming the isolation portions 123 on the two extension portions 120 of the same first opening 101 arranged facing each other. Through the above-mentioned structural design, the utility model utilizes the first thinning portion 134 to thin the side of the insulating glue opposite to the electrode coating area 421, so that the thickness of the insulating glue at the contact position with the slurry is greatly reduced. During drying, the thinned side of the insulating glue slurry will be easier to dry due to less slurry, and it can be solidified after drying to avoid deformation due to surface tension, and to avoid the insulating glue slurry from melting with the electrode slurry, that is, to avoid melting, thereby improving the accuracy of die-cutting positioning and ensuring product yield.

[0091] Based on the above detailed description of several exemplary embodiments of the coating gasket 100 proposed in the present invention, an exemplary embodiment of the coating device proposed in the present invention will be described below.

[0092] See also Fig. 9 and Fig.10 , Fig. 9 A three-dimensional structural schematic diagram of the coating device proposed by the utility model is representatively shown in FIG. Fig.10 A side view of the coating device is representatively shown in FIG. In this exemplary embodiment, the coating device proposed in the present invention is described by taking the coating of a pole piece as an example. It is easy for a person skilled in the art to understand that in order to apply the relevant design of the present invention to other types of coating devices, various modifications, additions, substitutions, deletions or other changes are made to the specific embodiments described below, and these changes are still within the scope of the principle of the coating device proposed in the present invention.

[0093] like Fig. 9 and Fig.10 As shown, in one embodiment of the present invention, the coating device proposed by the present invention includes the coating gasket 100 proposed by the present invention and described in detail in the above embodiments.

[0094] like Fig. 9 and Fig.10 As shown, in one embodiment of the present invention, the coating device provided by the present invention further includes an upper die head 200 and a lower die head 300. Specifically, the upper die head 200 and the lower die head 300 are arranged opposite to each other up and down, and the coating gasket 100 is sandwiched between the upper die head 200 and the lower die head 300, and the coating device is configured to transport the slurry to the coating gasket 100 via at least one of the upper die head 200 and the lower die head 300.

[0095] It should be noted that the coating devices shown in the drawings and described in this specification are only a few examples of many coating devices that can adopt the principles of the present invention. It should be clearly understood that the principles of the present invention are by no means limited to any details or any components of the coating devices shown in the drawings or described in this specification.

[0096] In summary, the coating equipment proposed in the present invention can avoid the situation where the insulating glue slurry and the electrode slurry melt together by adopting the coating gasket 100 proposed in the present invention, that is, avoid the melting phenomenon, improve the accuracy of die-cutting positioning, and ensure product yield.

[0097] The above describes and / or illustrates in detail the exemplary embodiments of the pole piece, coating pad and coating equipment proposed by the utility model. However, the embodiments of the utility model are not limited to the specific embodiments described here. On the contrary, the components and / or steps of each embodiment can be used independently and separately from other components and / or steps described here. Each component and / or each step of an embodiment can also be used in combination with other components and / or steps of other embodiments. When introducing the elements / components / etc. described and / or illustrated here, the terms "one", "one" and "above" are used to indicate the presence of one or more elements / components / etc. The terms "comprising", "including" and "having" are used to express the meaning of open inclusion and mean that in addition to the listed elements / components / etc., there may be other elements / components / etc. In addition, the terms "first" and "second" in the claims and the specification are used only as marks and are not numerical restrictions on their objects.

[0098] Although the pole piece, coating gasket and coating equipment proposed in the present invention have been described according to different specific embodiments, those skilled in the art will recognize that the implementation of the present invention can be modified within the spirit and scope of the claims.

Claims

1. A pole piece, characterized in that: It includes a current collector and a coating layer attached to the surface of the current collector, the coating layer includes an electrode coating area and an insulating glue coating area, the insulating glue coating area is located at the edge of the electrode coating area; wherein the electrode coating area has a first thinning area, and the insulating glue coating area has a second thinning area; wherein the first thinning area is arranged opposite to and in contact with the second thinning area, or the first thinning area is arranged opposite to and at least partially overlaps with the second thinning area, and the width of the overlapping area is less than or equal to 0.2 mm.

2. The pole piece according to claim 1, characterized in that: The electrode is a positive electrode, wherein: The positive electrode sheet is a ternary positive electrode sheet, and its double-sided surface density is greater than or equal to 200g / m 2 ;or The positive electrode sheet is a lithium iron phosphate positive electrode sheet, and its double-sided surface density is greater than or equal to 300g / m 2 ;or The positive electrode sheet is a lithium manganese iron phosphate positive electrode sheet, and its double-sided surface density is greater than or equal to 240g / m 2 .

3. The pole piece according to claim 1, characterized in that: The width of the second thinned area accounts for 1 / 10 to 3 / 5 of the width of the insulating adhesive coating area.

4. The pole piece according to claim 1, characterized in that: The width of the first thinned area is 3 mm to 18 mm; and / or The width of the second thinned area is 0.5 mm to 2.5 mm.

5. The pole piece according to claim 1, characterized in that: The coating layer has two insulating adhesive coating areas, the two insulating adhesive coating areas are respectively located at opposite sides of the electrode coating area, and the widths of the second thinned areas of the two insulating adhesive coating areas are different.

6. The pole piece according to claim 5, characterized in that: Along the arrangement direction of the two insulating adhesive coating areas, the length of the pole piece is less than 800 mm.

7. The pole piece according to claim 1, characterized in that: The thickness of the coating layer in the electrode coating area is greater than the thickness of the coating layer in the insulating glue coating area.

8. A coated gasket, characterized in that: Used to be arranged in a coating device, the coating device is used to apply a coating layer to form the electrode according to any one of claims 1 to 7, wherein: The coating gasket comprises a main body and at least two extensions, at least two of the extensions extend from the same side of the main body in a first direction, and at least two of the extensions are arranged at intervals along a second direction perpendicular to the first direction, so that two adjacent extensions and the main body together form a first opening with an opening direction in the first direction, and the first direction and the second direction are both perpendicular to the thickness direction of the coating gasket; The extension portion is provided with a first through hole and a second opening which penetrate along the thickness direction, wherein one end of the second opening is connected to the first through hole, and the other end is open to an edge of one side of the extension portion away from the main body portion; The part of the protruding portion located between the first opening and the second opening forms an isolation portion, and a first thinned portion is provided on the side of the isolation portion facing the first opening, and a second thinned portion is provided on the side of the isolation portion facing the second opening, so that the isolation portions on the two protruding portions of the same first opening are arranged facing each other.

9. The coated gasket according to claim 8, characterized in that: The coated gasket has a first groove on one side surface in the thickness direction, the first groove is connected to the first through hole, the first groove is suitable for insulating adhesive to flow into the first through hole, and the depth of the first groove accounts for 1 / 4 to 3 / 4 of the thickness of the coated gasket.

10. The coated gasket according to claim 8, characterized in that: The coating gasket has a second groove on one side surface in the thickness direction, the second groove is located on the side of the isolation portion facing the first opening and serves as the first thinned portion, and the second groove has a groove wall only on one side of the isolation portion.

11. The coated gasket according to claim 10, characterized in that: The groove wall of the second groove is a chamfered structure; and / or The depth of the second groove accounts for 1 / 6 to 4 / 5 of the thickness of the coating gasket.

12. The coated gasket according to claim 8, characterized in that: The coating gasket has a third groove on one side surface in the thickness direction, the third groove is located on the side of the isolation portion facing the second opening and serves as the second thinned portion, and the third groove has a groove wall only on one side of the isolation portion.

13. The coated gasket according to claim 12, characterized in that: One end of the groove wall of the third groove away from the main body is in a chamfered structure.

14. The coated gasket according to claim 12, characterized in that: The ratio of the width of the third groove to the width of the second opening is 1 / 3 to 3 / 1; and / or The depth of the third groove accounts for 1 / 6 to 4 / 5 of the thickness of the coating gasket.

15. The coated gasket according to any one of claims 8 to 14, characterized in that: The coating gasket includes at least three protrusions, and the at least three protrusions include two edge protrusions and at least one middle protrusion, the two edge protrusions are respectively two protrusions located at the two ends in the second direction, and the protrusions located between the two edge protrusions are all middle protrusions, so as to form at least two first openings arranged at intervals along the second direction; wherein the middle protrusion is provided with two first through holes and two second openings, and one end of each of the two second openings is respectively connected to the two first through holes, and the isolation portion is formed on both sides of the middle protrusion in the second direction.

16. The coated gasket according to claim 15, characterized in that The width of the second thinned portion provided at the middle protruding portion is greater than the width of the second thinned portion provided at the edge protruding portion.

17. A coating device, characterized in that: A coated gasket comprising any one of claims 8 to 16.

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