Coating device and production line

Abstract

The utility model provides a coating device and a production line. The coating device comprises a coating assembly and a punching assembly, the coating assembly comprises a conveying part and a coating part, the conveying part is used for conveying the pole piece, and the coating part is used for coating the pole piece with slurry. The punching assembly is arranged at the downstream of the coating part, and the punching assembly is configured to be capable of getting close to or away from the conveying part and punching slurry on the surface of the pole piece. In the punching process, dust is not generated or heat influence is not caused, energy consumption is low, punching control is achieved only by controlling movement of the punching assembly, the relative speed and the spacing distance of movement between the two rollers do not need to be accurately controlled, and therefore high-precision punching can be achieved in a simpler and more convenient mode. Therefore, the coating device can enable the punching mode of the pole piece to be simpler, energy conservation and environmental protection are facilitated while the punching precision is guaranteed, and dust or heat influence is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and particularly relates to a coating device and a production line. Background Art

[0002] Punching holes in the electrode sheet has become a relatively mature method in the lithium-ion battery industry to improve the battery dynamics performance. Punching holes in the active material layer of the electrode sheet enables the electrolyte to enter the openings in the active material layer during battery use, allowing lithium ions to quickly pass through the electrolyte directly into the openings and enter the active material layer through the inner wall or bottom of the openings, thereby greatly improving the charging ability and constructing an efficient ion transport path.

[0003] In the related art, the electrode sheet punching process mainly adopts the laser etching method or the roller imprinting method. The laser etching method mainly etches the surface by heating with a laser beam, generating a large amount of dust during the process and causing serious thermal radiation effects on the coating near the openings, which affects the established functions. The roller imprinting method forms openings by the extrusion action of two rollers on the electrode sheet and the coating. This method requires precise control of the relative speed and the spacing distance between the imprinting roller and the conveying roller, resulting in a large cost. Summary of the Utility Model

[0004] The main purpose of the utility model is to propose a coating device and a production line, which are beneficial to energy conservation and environmental protection while ensuring the punching accuracy, and avoid generating dust or causing thermal effects.

[0005] To achieve the above object, the embodiments of the utility model adopt the following technical solutions:

[0006] A coating device, comprising:

[0007] A coating component, including a conveying part and a coating part. The conveying part is used for conveying the electrode sheet, and the coating part is used for coating the slurry on the electrode sheet;

[0008] A punching component, arranged downstream of the coating part. The punching component is configured to be able to approach or move away from the conveying part and punch holes in the slurry on the surface of the electrode sheet.

[0009] In some embodiments, the punching component includes a punching part and a control part. The control part is configured to be able to control the punching part to approach or move away from the conveying part and make the punching part punch holes in the slurry.

[0010] In some embodiments, the punching part is strip-shaped, and along the movement direction of the punching part, the cross-section of the punching part is one of a triangle, a rectangle, a trapezoid, a circle, and an ellipse.

[0011] In some embodiments, the movement direction of the punching part is the vertical direction.

[0012] In some embodiments, the control unit is configured to control the telescopic displacement and / or the telescopic frequency of the punching unit.

[0013] In some embodiments, the conveying unit is adapted to continuously convey the electrode sheet, and the conveying speed is v. The maximum dimension of the punching unit in the direction of the conveying speed is w. The punching unit has a limit position close to the conveying unit. The time interval from when the punching unit starts at the limit position to when it starts to move away from the conveying unit is t. The control unit is configured to control the telescopic frequency of the punching unit, and it satisfies: t = w / v.

[0014] In some embodiments, the coating device further includes a smoothing roller, which is arranged downstream of the punching assembly and moves relative to the electrode sheet to be adapted to smear the slurry on the surface of the electrode sheet.

[0015] In some embodiments, the conveying unit includes a conveying roller and a conveyor belt wound around the conveying roller. The smoothing roller and the conveying roller are arranged opposite to each other so that the smoothing roller and the conveying roller are adapted to jointly extrude and smear the slurry.

[0016] In some embodiments, the conveying unit includes a conveying roller and a conveyor belt wound around the conveying roller. The coating unit includes a coating roller and a comma roller. The coating roller and the comma roller are arranged opposite to each other to jointly extrude the slurry. The coating roller is configured to coat the extruded slurry onto the conveyor belt.

[0017] An embodiment of the second aspect of the present invention further provides a production line, including the coating device according to any one of the above embodiments.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] The coating device of the solution of the present invention includes a coating assembly and a punching assembly. The coating assembly includes a conveying unit and a coating unit. The conveying unit is used to convey the electrode sheet, and the coating unit is used to coat the slurry on the electrode sheet. The punching assembly is arranged downstream of the coating unit. The punching assembly is configured to be able to approach or move away from the conveying unit and punch holes in the slurry on the surface of the electrode sheet. Compared with the punching methods in the related art that use a laser beam to heat and etch the surface of the electrode sheet or use the relative movement of roller wheels to extrude the electrode sheet, the coating device of the solution of the present invention only uses the relative approach or movement away between the punching assembly and the conveying unit to play a punching role. On the one hand, no dust is generated or thermal influence is caused during the punching process, and the energy consumption is less. On the other hand, the control of punching only needs to control the movement of the punching assembly, and it is not necessary to precisely control the relative speed and the spacing distance of the movement between the two roller wheels. Therefore, high-precision punching can be achieved in a simpler way. Therefore, the coating device of the solution of the present invention can make the punching method of the electrode sheet more concise, and is beneficial to energy conservation and environmental protection while ensuring the punching accuracy, and avoids generating dust or causing thermal influence. Description of the Drawings

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the structures shown in these drawings.

[0021] Figure 1 It is a schematic side view of the coating device, the electrode sheet and the slurry combination provided in the first embodiment of the present invention; wherein, the punching part is in the retracted state;

[0022] Figure 2 It is a schematic side view of the coating device, the electrode sheet and the slurry combination provided in the first embodiment of the present invention; wherein, the punching part is in the extended state and punches the slurry;

[0023] Figure 3 It is a schematic front view of the punching part along the conveying direction of the conveying part provided in the first embodiment of the present invention;

[0024] Figure 4 It is a schematic front view of the punching part along the conveying direction of the conveying part provided in the second embodiment of the present invention.

[0025] Explanation of the reference numerals in the drawings:

[0026] Coating device 100;

[0027] Coating component 110; conveying part 111; conveying roller 1111; conveyor belt 1112; coating part 112; coating roller 1121; comma roller 1122;

[0028] Punching component 120; punching part 121; control part 122;

[0029] Smoothing roller 130;

[0030] Electrode sheet 200;

[0031] Slurry 300.

[0032] The realization, functional features and advantages of the object of the present invention will be further described in conjunction with the embodiments with reference to the drawings. Detailed implementation manners

[0033] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without making creative efforts belong to the scope of protection of the present utility model.

[0034] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present utility model, the directional indications are only used to explain the relative positional relationship and movement conditions between components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0035] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present utility model, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, if "and / or", "and / or" or "and / or" appear throughout the text, their meanings include three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or a solution that satisfies both A and B at the same time. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0036] Punching holes in the electrode sheet has become a relatively mature method in the lithium-ion battery industry to improve the battery's kinetic performance. Punching holes in the active material layer of the electrode sheet allows the electrolyte to enter the openings in the active material layer during battery use. Lithium ions can quickly enter the openings directly through the electrolyte and then enter the active material layer through the inner wall or bottom of the openings, thereby greatly improving the charging capacity and constructing an efficient ion transport path.

[0037] In the related art, the electrode sheet punching process mainly uses laser etching or roller imprinting. The laser etching method mainly etches the surface by heating with a laser beam, which will generate a large amount of dust during the process and cause serious thermal radiation effects on the coating near the openings and affect the established functions. The roller imprinting method forms openings through the extrusion of two rollers on the electrode sheet and the coating. This method requires precise control of the relative speed and spacing between the imprinting roller and the conveying roller, resulting in a relatively high cost.

[0038] In view of this, see Figures 1-4, in the embodiments of the present utility model, a coating device 100 is provided. More specifically, in the battery manufacturing process, the coating device 100 can be used to apply the slurry 300 onto the electrode sheet 200. In addition, subsequent operations such as drying are performed on the electrode sheet 200 coated with the slurry 300. Through the above process, the slurry 300 can specifically serve as the active material layer, and the slurry 300 can be composed of various components such as active materials, conductive agents, binders, and solvents. And according to requirements, the electrode sheet 200 on which the coating device 100 acts can be the anode electrode sheet 200 or the cathode electrode sheet 200.

[0039] The coating device 100 includes a coating assembly 110 and a punching assembly 120. Specifically, referring to Figures 1-2 , the coating assembly 110 includes a conveying part 111 and a coating part 112. Among them, the conveying part 111 is used to convey the electrode sheet 200, and the coating part 112 is used to coat the slurry 300 onto the electrode sheet 200. Due to the above functions, the conveying part 111 can be any device suitable for conveying the electrode sheet 200. Exemplarily, in some embodiments, the conveying part 111 can include conveying rollers 1111 and a conveyor belt 1112, and the electrode sheet 200 is suitable for being placed on the conveyor belt 1112 and is conveyed thereby; or in other embodiments, the conveying part 111 can include a carrier and a moving part, the carrier can adopt any suitable form to carry the electrode sheet 200, and the moving part can adopt any suitable form to move the carrier and convey the electrode sheet 200 thereby. For ease of description, hereinafter, the embodiments in which the conveying part 111 uses the belt drive of the combination of the conveying rollers 1111 and the conveyor belt 1112 to convey the electrode sheet 200 will be used as illustrations, and different embodiments can be combined between different technical solutions. In addition, the coating part 112 can also be any device suitable for coating the slurry 300 onto the electrode sheet 200. Exemplarily, in some embodiments, the slurry 300 can be laid on the surface of the electrode sheet 200 through the relative movement cooperation between the coating part 112 and the conveying part 111 (the coating part 112 can move or not move), and in other embodiments, the coating part 112 can coat the slurry 300 onto the electrode sheet 200 by means of carrying the slurry 300.

[0040] In order to punch the electrode sheet 200, referring to Figures 1-2, the punching assembly 120 is provided downstream of the coating part 112. That is to say, the electrode sheet 200 on which the punching assembly 120 acts is the electrode sheet 200 after the slurry 300 is coated. Based on this, the punching assembly 120 is configured to be able to approach or move away from the conveying part 111 and punch holes in the slurry 300 on the surface of the electrode sheet 200. It can be understood that by providing the punching assembly 120 and driving the punching assembly 120 to move relative to the conveying part 111 (i.e., relative to the electrode sheet 200), the punching assembly 120 can contact the slurry 300 on the surface of the electrode sheet 200 and punch holes in it. Due to the above functions, the punching assembly 120 can move and punch holes in any suitable form, and the movement of the punching assembly 120 approaching or moving away from the conveying part 111 can be controlled and automatically driven by the controller or manually driven. In addition, in some embodiments, the punching assembly 120 can be cooperatively connected with the coating assembly 110, or the two can be integrally connected, so as to improve the integrity of the coating device 100; in other embodiments, the punching assembly 120 can be placed separately from the coating assembly 110, that is, on the premise of meeting the respective cooperative functions of the coating assembly 110 and the punching assembly 120, the coating assembly 110 and the punching assembly 120 can be placed at any suitable positions respectively to improve the layout freedom of the coating device 100.

[0041] According to the combination of the above embodiments, it can be seen that the coating device 100 of the solution of the present utility model includes a coating assembly 110 and a punching assembly 120. The coating assembly 110 includes a conveying part 111 and a coating part 112. The conveying part 111 is used to convey the electrode sheet 200, and the coating part 112 is used to coat the slurry 300 on the electrode sheet 200. The punching assembly 120 is provided downstream of the coating part 112. The punching assembly 120 is configured to be able to approach or move away from the conveying part 111 and punch holes in the slurry 300 on the surface of the electrode sheet 200. Compared with the punching methods in the related art that use a laser beam to heat and etch the surface of the electrode sheet 200 or use the relative movement of rollers to extrude the electrode sheet 200, the coating device 100 of the solution of the present utility model only uses the relative approach or separation movement between the punching assembly 120 and the conveying part 111 to play a punching role. On the one hand, no dust will be generated or thermal influence will be caused during the punching process, and the energy consumption is less. On the other hand, the control of punching only needs to control the movement of the punching assembly 120, and it is not necessary to accurately control the relative speed and the spacing distance of the movement between the two rollers. Therefore, the punching of the electrode sheet 200 can be realized in a simpler way with high precision. Therefore, the coating device 100 of the solution of the present utility model can make the punching method of the electrode sheet 200 more concise, and is beneficial to energy conservation and environmental protection while ensuring the punching accuracy, and avoids generating dust or causing thermal influence.

[0042] For the specific structural form of the conveying part 111, see Figures 1-2, the conveying part 111 includes a conveying roller 1111 and a conveyor belt 1112 wound around the conveying roller 1111. The coating part 112 includes a coating roller 1121 and a comma roller 1122. The coating roller 1121 and the comma roller 1122 are arranged opposite to each other to jointly extrude the slurry 300. The coating roller 1121 is configured to coat the extruded slurry 300 onto the conveyor belt 1112. In addition, in some embodiments, the spacing between the coating roller 1121 and the comma roller 1122 can be adjusted, so as to adjust the thickness of the slurry 300 conveyed by the coating part 112 and the thickness of the coating applied to the electrode sheet 200.

[0043] For the specific configuration form of the punching assembly 120, refer to Figures 1-2 , in some embodiments, the punching assembly 120 includes a punching part 121 and a control part 122. The control part 122 is configured to be able to control the punching part 121 to approach or move away from the conveying part 111 and make the punching part 121 punch holes in the slurry 300. It can be understood that the punching part 121 is the part for contacting the slurry 300 and punching holes, and the control part 122 is the part for controlling and driving the movement of the punching part 121. On the one hand, due to the above functions, the punching part 121 can be designed in any suitable structure and shape according to the punching requirements. Exemplarily, refer to Figures 3-4 , in some embodiments, the punching part 121 can be strip-shaped, and the strip-shaped punching part 121 as a whole can be in the structure of an elongated roller body (which can correspondingly punch one opening), or can be in the structure of a sheet body extending along the width direction of the electrode sheet 200 (which can correspondingly punch a plurality of openings arranged along the width direction of the electrode sheet 200). In addition, along the movement direction of the punching part 121, the cross-section of the punching part 121 is one of a triangle, a rectangle, a trapezoid, a circle, and an ellipse. In addition, in some embodiments, the movement direction of the control part 122 driving the punching part 121 is the vertical direction; while in other embodiments, the control part 122 can drive the punching part 121 in any suitable direction according to the requirements. For example, when the punching part 121 is inclined at a certain angle with respect to the supporting plane of the conveyor belt 1112 and is not perpendicular, inclined extending openings can be correspondingly punched in the slurry 300. On the other hand, due to the above functions, the control part 122 can be any device suitable for controlling and driving the punching part 121. Exemplarily, in some embodiments, the telescopic movement of the punching part 121 relative to the conveying part 111 is controlled by an electric controller with adjustable limit, and the telescopic rhythm of the punching part 121 is controlled by a PLC and can be set and adjusted through a time controller.

[0044] In addition, the punching part 121 and the control part 122 can be connected in any suitable manner and structure. For example, in some embodiments, when the control part 122 is a device such as a cylinder or an electric rod with a movable output end, the punching part 121 can be connected to a connecting piece, and the connecting piece is further connected to the output end of the control part 122. Thus, the output end of the control part 122 can directly drive the punching part 121 to perform the same movement through telescopic movement; or the punching part 121 can be directly connected to the output end of the control part 122.

[0045] Based on the punching part 121 and the control part 122 defined in the above embodiments, in some embodiments, the control part 122 is configured to control the telescopic displacement and / or the telescopic frequency of the punching part 121. The above telescopic displacement and telescopic frequency both refer to two aspects of movement, that is, the extending movement and the retracting movement of the punching part 121 relative to the conveying part 111, and the displacement of the punching part 121 and / or the movement speed of the punching part 121 during the two movement processes can be the same or different. More specifically, for the configuration of the control part 122 controlling the punching part 121, in some embodiments, the conveying part 111 is adapted to continuously convey the pole piece 200, and the conveying speed is v, that is to say, the conveying part 111 can continuously and uninterruptedly convey the pole piece 200 around the punching part 121 at a speed of v. The maximum dimension of the punching part 121 along the direction of the conveying speed is w, the punching part 121 has a limit position close to the conveying part 111, and the time interval from when the punching part 121 starts at the limit position to when it starts to move away from the conveying part 111 is t. The control part 122 is configured to control the telescopic frequency of the punching part 121 and satisfies: t = w / v. It can be understood that the above setting enables the pole piece 200 to travel a distance of w within the time t, and this distance also corresponds to the dimension of the punching part 121, so that the extension and stay time of the punching part 121 can correspond to the movement of the pole piece 200.

[0046] See Figures 1-2, in some embodiments, the coating device 100 further includes a leveling roller 130. The leveling roller 130 is disposed downstream of the punching assembly 120 and moves relative to the electrode sheet 200 to be adapted to smear the slurry 300 on the surface of the electrode sheet 200. More specifically, the conveying part 111 includes a conveying roller 1111 and a conveyor belt 1112 wound around the conveying roller 1111. The leveling roller 130 and the conveying roller 1111 are arranged oppositely so that the leveling roller 130 and the conveying roller 1111 are adapted to jointly extrude and smear the slurry 300. It can be understood that since the punching assembly 120 will exert an extrusion effect on the slurry 300 during punching, and thus the extruded and overflowed slurry 300 will form protrusions on the coating surface. In order to improve the coating quality, the leveling roller 130 can be used to level the protrusions formed by the slurry 300. In addition, it should be noted that the smearing effect of the leveling roller 130 can, on the one hand, be to mix and smear the slurry 300 protruding on the surface of the electrode sheet 200 with the flat slurry 300 evenly, and on the other hand, also be to move the slurry 300 protruding on the surface of the electrode sheet 200 out of the surface of the electrode sheet 200 (specifically, it can be to obtain the slurry 300 or scrape off the slurry 300). Thus, in some embodiments, the leveling roller 130 can move to actively smear the slurry 300; or in other embodiments, since the conveying part 111 is moving, the leveling roller 130 can be fixedly arranged and can also smear the slurry 300.

[0047] An embodiment of the second aspect of the present invention further provides a production line, which includes the coating device 100 of any of the above embodiments, and the coating device 100 can specifically be disposed upstream of the drying oven. Specifically, according to requirements, the production line can be used to manufacture any suitable type and specification of battery, for example, it can be used to manufacture lithium-ion batteries. In addition, other devices of the production line can refer to the related art and will not be elaborated here.

[0048] Benefiting from the improvements to the coating device 100 in the above embodiments, the production line of the second aspect embodiment of the present invention has the same technical effects as the coating device 100 in the above embodiments. It will not be elaborated here.

[0049] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structural transformation made under the application concept of the present invention by using the content of the specification and drawings of the present invention, or directly / indirectly applied in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A coating device, characterized in that: include: A coating assembly, comprising a conveying part and a coating part, wherein the conveying part is used to convey the pole piece, and the coating part is used to coat the slurry on the pole piece; The punching assembly is arranged downstream of the coating section, and the punching assembly is configured to be able to approach or move away from the conveying section and punch holes in the slurry on the surface of the electrode piece.

2. The coating device according to claim 1, characterized in that: The punching assembly includes a punching part and a control part, and the control part is configured to control the punching part to approach or move away from the conveying part, and to make the punching part punch holes in the slurry.

3. The coating device according to claim 2, characterized in that: The punching portion is in a strip shape, and along the moving direction of the punching portion, the cross section of the punching portion is in one of a triangle, a rectangle, a trapezoid, a circle, and an ellipse.

4. The coating device according to claim 2, characterized in that: The movement direction of the punching part is vertical.

5. The coating device according to claim 2, characterized in that: The control portion is configured to control the telescopic displacement of the punching portion and / or the telescopic frequency of the punching portion.

6. The coating device according to claim 2, characterized in that: The conveying portion is suitable for continuously conveying the pole piece, and the conveying speed is v, the maximum dimension of the punching portion along the direction of the conveying speed is w, the punching portion has an extreme position close to the conveying portion, and the time interval from when the punching portion starts to be located at the extreme position to when it starts to move away from the conveying portion is t, and the control portion is configured to control the expansion and contraction frequency of the punching portion, and satisfies: t=w / v.

7. The coating device according to claim 1, characterized in that: The coating device also includes a smoothing roller, which is arranged downstream of the punching assembly and moves relative to the pole piece so as to be suitable for coating the slurry on the surface of the pole piece.

8. The coating device according to claim 7, characterized in that: The conveying part includes a conveying roller and a conveying belt wound around the conveying roller. The smoothing roller is arranged opposite to the conveying roller, so that the smoothing roller and the conveying roller are suitable for jointly extruding and applying the slurry.

9. The coating device according to claim 1, characterized in that: The conveying part includes a conveying roller and a conveying belt wound around the conveying roller, and the coating part includes a coating roller and a comma roller. The coating roller and the comma roller are arranged opposite to each other to extrude the slurry together, and the coating roller is configured to coat the extruded slurry onto the conveying belt.

10. A production line, characterized in that: include: The coating device according to any one of claims 1 to 9.

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