Electrode film preparation device and pole piece preparation equipment

Abstract

The utility model belongs to the technical field of pole piece preparation, and provides an electrode film preparation device and pole piece preparation equipment. The electrode film preparation device comprises a screw extruder and a roller press, the screw extruder comprises an extruder body and a slit extrusion head, the extruder body comprises a feeding end and a discharging end, the slit extrusion head is arranged on one side of the discharging end and faces the roller press, and the width of the slit extrusion head is adjustable. The electrode film preparation device provided by the utility model can accurately control the thickness of the electrode film.

Description

Technical Field

[0001] The present application relates to the technical field of electrode preparation, and in particular to an electrode film preparation device and an electrode preparation equipment. Background Art

[0002] With the rapid development of electrochemical energy storage devices, the energy density requirements for electrodes are becoming increasingly higher.

[0003] Electrochemical energy storage devices may be lithium-ion batteries, supercapacitors, and the like. Taking lithium-ion batteries as an example, lithium-ion batteries include two pole pieces with opposite polarities, such as a positive pole piece and a negative pole piece. The pole piece includes a current collector and an electrode film attached to the current collector. The raw materials of the electrode film include an electrode active material, a conductive agent, and an adhesive. The electrode active material, the conductive agent, and the adhesive are mixed evenly to form a mixture. The mixture is transported to a roller press and rolled into an electrode film by the roller press.

[0004] In the related art, it is difficult to control the feed amount of the mixture input to the roller press, making it difficult to control the thickness of the electrode film. Utility Model Content

[0005] The present application provides an electrode film preparation device and an electrode piece preparation equipment, and the electrode film preparation device can control the thickness of the electrode film more accurately.

[0006] The present application provides an electrode film preparation device, including: a screw extruder and a roller press, the screw extruder includes an extruder body and a slit extrusion head, the extruder body includes a feed end and a discharge end, the slit extrusion head is arranged on one side of the discharge end, the slit extrusion head is arranged toward the roller press, and the width of the slit extrusion head is adjustable.

[0007] In a possible embodiment, the electrode film preparation device provided in the present application, the slit extrusion head includes a bottom shell and an upper cover, the electrode film preparation device also includes a driving member, the upper cover is arranged on the bottom shell, the driving member is connected to the upper cover, and the driving member is used to drive the upper cover to move relative to the bottom shell to adjust the distance between the upper cover and the bottom shell.

[0008] In a possible implementation, the electrode film preparation device provided by the present application has a plurality of upper covers and driving members, and the upper covers and driving members are connected one by one;

[0009] The electrode film preparation device also includes a controller, each driving member is electrically connected to the controller, and the controller is used to control the multiple driving members to simultaneously drive the multiple upper covers to move relative to the bottom shell.

[0010] In a possible implementation, in the electrode film preparation device provided in the present application, the screw extruder further includes a material storage chamber, and the material storage chamber is located between the extruder body and the slit extrusion head.

[0011] In a possible implementation, in the electrode membrane preparation device provided in the present application, the storage cavity is spherical.

[0012] In a possible implementation manner, in the electrode film preparation device provided in the present application, the roller press includes two rollers, and a roller spacing is set in the controller;

[0013] The controller is used to adjust the distance between the upper cover and the bottom shell according to the distance between the pressure rollers.

[0014] In a possible implementation, the electrode film preparation device provided in the present application further includes a plurality of conveying rollers, and the plurality of conveying rollers are sequentially arranged between the slit extrusion head and the roller press.

[0015] In a possible implementation, the electrode film preparation device provided in the present application further includes a first winding roller, and the first winding roller is arranged at the rear end of the roller press.

[0016] In a possible implementation, the electrode film preparation device provided in the present application further includes a steering roller, and the steering roller is arranged between the roller press and the first winding roller.

[0017] The present application also provides an electrode sheet preparation device, including a pressing machine and the above-mentioned electrode film preparation device, wherein the pressing machine is arranged at the rear end of the electrode film preparation device, and the pressing machine is used to press the current collector and the electrode film prepared by the electrode film preparation device.

[0018] The electrode film preparation device and electrode sheet preparation equipment provided by the present application are provided with a screw extruder and a roller press, wherein the screw extruder includes an extruder body and a slit extrusion head, the extruder body includes a feed end and a discharge end, the slit extrusion head is arranged on one side of the discharge end, the slit extrusion head is arranged toward the roller press, and the roller press is used to press the mixture output from the slit extrusion head to form an electrode film. The width of the slit extrusion head is adjustable, and thus, the width of the slit extrusion head can be set according to the required thickness of the electrode film, so that the thickness of the mixture output from the slit extrusion head can be changed according to the required thickness of the electrode film, and the thickness of the electrode film can be controlled more accurately. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are 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 work.

[0020] Figure 1 It is a schematic diagram of the structure of the pole piece;

[0021] Figure 2 A schematic diagram of the structure of an electrode film preparation device provided in an embodiment of the present application;

[0022] Figure 3 Schematic diagram of the structure of the slit extrusion head in the electrode film preparation device provided in the embodiment of the present application Figure 1 ;

[0023] Figure 4 Schematic diagram of the structure of the slit extrusion head in the electrode film preparation device provided in the embodiment of the present application Figure 2 ;

[0024] Figure 5 A schematic diagram of the structure of the electrode preparation equipment provided in an embodiment of the present application.

[0025] Description of reference numerals:

[0026] 10-pole piece;

[0027] 11-Current collector;

[0028] 12-electrode membrane;

[0029] 100-Electrode film preparation device;

[0030] 110-screw extruder;

[0031] 111- extruder body;

[0032] 111a-feed end;

[0033] 111b-discharging end;

[0034] 112-slit extruder head; 1121-bottom shell; 1122-upper cover; 1223-adapter;

[0035] 113-barrel;

[0036] 114- screw;

[0037] 115-feeding port;

[0038] 120-roller press;

[0039] 121-pressing roller;

[0040] 130-driving member;

[0041] 131- first motor;

[0042] 132-screw rod;

[0043] 133-slider;

[0044] 140-controller;

[0045] 150-storage chamber;

[0046] 160- conveyor roller;

[0047] 170-first winding roller;

[0048] 180-steering roller;

[0049] 200-pressing machine;

[0050] 300- second winding roller;

[0051] 400-current collector winding roller;

[0052] 1000-Pole piece preparation equipment;

[0053] L-slit extrusion head length;

[0054] L1- roller spacing;

[0055] W-slit extruder width. DETAILED DESCRIPTION

[0056] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0057] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, or it can be an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0058] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0059] The terms "first", "second", "third" (if any) in the specification and claims of this application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the application described herein can be implemented in an order other than those illustrated or described herein, for example.

[0060] In addition, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, for example, a process, method, system, product, or service tool that includes a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such process, method, product, or service tool.

[0061] With the rapid development of electrochemical energy storage devices, the energy density requirements for electrodes are becoming increasingly higher.

[0062] Electrochemical energy storage devices can be lithium-ion batteries, supercapacitors, etc. Taking lithium-ion batteries as an example, lithium-ion batteries include two poles with opposite polarities, such as a positive pole and a negative pole. Lithium-ion batteries also include pole ears, a diaphragm, and a shell. The pole ears are welded on the two poles, and then the two poles and the diaphragm are stacked and wound in sequence to form a battery cell structure; the battery cell structure is placed in the shell, and the electrolyte is injected into the shell.

[0063] Figure 1 It is a schematic diagram of the structure of the electrode.

[0064] See also Figure 1 As shown, the pole piece 10 includes a current collector 11 and an electrode film 12 attached to the current collector 11. The raw materials of the electrode film 12 include an electrode active material, a conductive agent and a binder, and the electrode active material, the conductive agent and the binder are mixed evenly to form a mixture, which is transported to a roller press and rolled into the electrode film 12 by the roller press.

[0065] During charging, the electrons on the current collector of the positive electrode sheet will reach the negative electrode through the external circuit, and the lithium ions will pass through the electrolyte from the electrode film on the positive electrode sheet, cross the diaphragm, reach the negative electrode and combine with the electrons, and be reduced to lithium and embedded in the electrode film of the negative electrode sheet. During discharge, the lithium embedded in the electrode film of the negative electrode sheet loses electrons, and the electrons on the current collector of the negative electrode sheet reach the positive electrode sheet through the external circuit, and the lithium ions will pass through the electrolyte from the electrode film on the negative electrode sheet, cross the diaphragm, reach the positive electrode sheet and combine with the electrons. Therefore, the thickness of the electrode film 12 on the electrode sheet 10 is related to the battery capacity of the lithium-ion battery, and therefore, the thickness of the electrode film 12 needs to be accurately controlled.

[0066] In the related art, the raw materials of the electrode membrane are directly poured onto a roller press, which makes it difficult to control the feeding amount of the raw materials of the electrode membrane, and thus the thickness of the electrode membrane is difficult to control.

[0067] Based on this, the present application provides an electrode film preparation device and an electrode piece preparation device, and the electrode film preparation device can control the thickness of the electrode film more accurately.

[0068] Figure 2 A schematic diagram of the structure of an electrode film preparation device provided in an embodiment of the present application; Figure 3 Schematic diagram of the structure of the slit extrusion head in the electrode film preparation device provided in the embodiment of the present application Figure 1 Among them, Figure 2 The electrode film 12 and raw materials for preparing the electrode film 12 are also shown in dotted lines.

[0069] See also Figure 2 and Figure 3 As shown, the electrode film preparation device 100 provided in the embodiment of the present application includes a screw extruder 110 and a roller press 120, the screw extruder 110 includes an extruder body 111 and a slit extrusion head 112, the extruder body 111 includes a feed end 111a and a discharge end 111b, the slit extrusion head 112 is arranged on one side of the discharge end 111b, the slit extrusion head 112 is arranged toward the roller press 120, and the width of the slit extrusion head 112 is adjustable.

[0070] The extruder body 111 includes a barrel 113 and a screw 114 located in the barrel 113. The screw 114 can rotate relative to the barrel 113. The barrel 113 can be provided with one screw 114, or two or more screws 114. Figure 2 Two screws 114 are shown.

[0071] A feed port 115 is provided on one side of the feed end 111a of the extruder body 111, and a mixture of electrode active materials, conductive agents and adhesives enters the barrel 113 from the feed port 115. As the screw 114 rotates relative to the barrel 113, the mixture is transported toward the discharge end 111b. During the transportation process, the electrode active materials, conductive agents and adhesives are further mixed as the screw 114 rotates, so that the electrode active materials, conductive agents and adhesives are mixed more evenly, wherein the adhesive is fiberized in the extruder body 111, so that the mixture is flocculent or paste-like.

[0072] A heating device may also be provided in the barrel 113 to allow the electrode active material, the conductive agent and the adhesive to be mixed more fully.

[0073] A slit extruder 112 is provided at one end of the discharge end 111b. Figure 3As shown, the cross section of the slit extrusion head 112 may be rectangular, the width of the slit extrusion head 112 is shown as the slit extrusion head width W, and the length of the slit extrusion head 112 is shown as the slit extrusion head length L. The cross section of the flocculent or paste-like mixture extruded by the slit extrusion head 112 is also roughly rectangular.

[0074] The mixture is conveyed to a roller press 120 , which includes two pressing rollers 121 . The mixture is conveyed between the two pressing rollers 121 , and is pressed by the pressing rollers 121 to form an electrode film 12 .

[0075] In the embodiment of the present application, the width W of the slit extrusion head is adjustable, thereby, the width W of the slit extrusion head can be set according to the required thickness of the electrode film 12, so that the thickness of the mixture output from the slit extrusion head 112 can be changed according to the required thickness of the electrode film 12, thereby, the thickness of the electrode film 12 can be controlled more accurately, and in addition, the thickness of the mixture output by the slit extrusion head 112 is also more uniform.

[0076] The electrode film preparation device 100 provided in the embodiment of the present application is provided with a screw extruder 110 and a roller press 120. The screw extruder 110 includes an extruder body 111 and a slit extrusion head 112. The extruder body 111 includes a feed end 111a and a discharge end 111b. The slit extrusion head 112 is arranged on one side of the discharge end 111b. The slit extrusion head 112 is arranged toward the roller press 120. The roller press 120 is used to press the mixture output from the slit extrusion head 112 to form an electrode film 12. The width of the slit extrusion head 112 is adjustable. Thus, the width of the slit extrusion head 112 can be set according to the required thickness of the electrode film 12, so that the thickness of the mixture output from the slit extrusion head 112 can be changed according to the required thickness of the electrode film 12, and the thickness of the electrode film 12 can be controlled more accurately.

[0077] Next, the specific method for adjusting the width W of the slit extrusion head is described.

[0078] Please continue to see Figure 3 As shown, the slit extrusion head 112 includes a bottom shell 1121 and an upper cover 1122, and the electrode film preparation device 100 also includes a driving member 130. The upper cover 1122 is covered on the bottom shell 1121, and the driving member 130 is connected to the upper cover 1122. The driving member 130 is used to drive the upper cover 1122 to move relative to the bottom shell 1121 to adjust the distance between the upper cover 1122 and the bottom shell 1121.

[0079] The bottom shell 1121 may be a shell with an opening at one end, and the upper cover 1122 is disposed on the end with the opening of the bottom shell 1121. The upper cover 1122 may move relative to the bottom shell 1121 to adjust the distance between the upper cover 1122 and the bottom shell 1121, and the distance between the upper cover 1122 and the bottom shell 1121 is the width W of the slit extrusion head.

[0080] The driving member 130 is used to drive the upper cover 1122 to move relative to the bottom shell 1121. The driving member 130 can be a cylinder driving assembly or a screw lifting assembly. The structure of the driving member 130 is described below by taking the screw lifting assembly as an example. Please continue to refer to the figure, the driving member 130 includes a first motor 131, a screw 132 and a slider 133. The screw 132 is connected to the rotating shaft of the first motor 131, and the slider 133 is threadedly connected to the screw 132. An adapter 1223 is set on the upper cover 1122, and the upper cover 1122 is connected to the slider 133 through the adapter 1223.

[0081] When the shaft of the first motor 131 rotates, the screw rod 132 is driven to rotate, and the slider 133 can move on the screw rod 132 , thereby driving the upper cover 1122 to move relative to the bottom shell 1121 , thereby adjusting the distance between the upper cover 1122 and the bottom shell 1121 .

[0082] Figure 4 Schematic diagram of the structure of the slit extrusion head in the electrode film preparation device provided in the embodiment of the present application Figure 2 .

[0083] See also Figure 4 As shown, there are multiple upper covers 1122 and driving members 130, and the upper covers 1122 and driving members 130 are connected one by one; the electrode film preparation device 100 also includes a controller 140, each driving member 130 is electrically connected to the controller 140, and the controller 140 is used to control multiple driving members 130 to simultaneously drive multiple upper covers 1122 to move relative to the bottom shell 1121.

[0084] When the length L of the slit extrusion head is large, the size of the upper cover 1122 along the length direction is also large, and the upper cover 1122 is easily deformed. The deformation of the upper cover 1122 will cause the thickness of the mixture to be uneven when it is discharged from the slit extrusion head 112. Therefore, a plurality of upper covers 1122 can be provided along the length direction, whereby the size of each upper cover 1122 along the length direction is small, so that the deformation amount of the upper cover 1122 is small.

[0085] Each upper cover 1122 needs to be connected to a driving member 130. These driving members 130 can be controlled by a controller 140. The controller 140 can be a programmable logic controller (PLC), and the first motor 131 in each driving member 130 is electrically connected to the controller 140. The controller 140 can control multiple driving members 130 to simultaneously drive multiple upper covers 1122 to move relative to the bottom shell 1121, so that the spacing between each upper cover 1122 and the bottom shell 1121 is the same.

[0086] Please continue to see Figure 2 As shown, the screw extruder 110 further includes a material storage chamber 150 , and the material storage chamber 150 is located between the extruder body 111 and the slit extrusion head 112 .

[0087] When the width W of the slit extruder head increases, the discharge speed of the extruder body 111 may be difficult to meet the discharge demand, thereby causing interruption in the discharge of the mixture.

[0088] In the embodiment of the present application, a storage chamber 150 can be provided to solve this problem. The storage chamber 150 is located between the extruder body 111 and the slit extrusion head 112, and the mixture output from the extruder body 111 can be temporarily stored in the storage chamber 150. Thus, when the width W of the slit extrusion head increases, the mixture in the storage chamber 150 can be used as a supplement.

[0089] Please continue to see Figure 2 As shown, the storage cavity 150 is spherical.

[0090] The storage chamber 150 is configured to be spherical, so that the pressure on the mixture at different positions of the storage chamber 150 can be uniform.

[0091] In some embodiments, a pressure roller interval L1 is provided in the controller 140 ; ​​the controller 140 is used to adjust the interval between the upper cover 1122 and the bottom shell 1121 according to the pressure roller interval L1 .

[0092] Specifically, the distance between the two rollers 121 is shown as the roller distance L1. The thickness of the electrode film 12 in some pole pieces 10 is relatively small, so the roller distance L1 is also set to be relatively small. The thickness of the electrode film 12 in some pole pieces 10 is relatively large, so the roller distance L1 is also set to be relatively large.

[0093] When the roller spacing L1 is small, the thickness of the mixture extruded from the slit extrusion head 112 is also small, so it is necessary to set the slit extrusion head width W to be small. When the roller spacing L1 is large, the thickness of the mixture extruded from the slit extrusion head 112 is also large, so it is necessary to set the slit extrusion head width W to be large.

[0094] In an embodiment of the present application, the pressure roller spacing L1 can be set in the controller 140. The controller 140 can control the driving member 130 to drive the upper cover 1122 to move according to the pressure roller spacing L1 to adjust the slit extrusion head width W, thereby solving the problem of mismatch between the pressure roller spacing L1 and the slit extrusion head width W.

[0095] Please continue to see Figure 2 As shown, the electrode film preparation device 100 further includes a plurality of conveying rollers 160 , and the plurality of conveying rollers 160 are sequentially arranged between the slit extrusion head 112 and the roller press 120 .

[0096] The mixture extruded from the slit extrusion head 112 can be conveyed to the roller press 120 by the conveying rollers 160. The number of conveying rollers 160 can be set according to the spacing between the slit extrusion head 112 and the roller press 120. The rotation speeds of the plurality of conveying rollers 160 are the same, and the mixture can be smoothly conveyed to the roller press 120 by the conveying rollers 160.

[0097] Please continue to see Figure 2 As shown, the electrode film preparation device 100 further includes a first winding roller 170 , and the first winding roller 170 is disposed at the rear end of the roller press 120 .

[0098] After the mixture is pressed into the electrode film 12 by the roller press 120, it needs to be rolled up for storage, and the electrode film 12 can be rolled up by the first winding roller 170. Figure 2 In the illustrated embodiment, the first winding roller 170 is disposed at the rear end of the roller press 120 , and the electrode film 12 pressed by the roller press 120 can be directly wound up by the first winding roller 170 , thereby improving the preparation efficiency of the electrode film 12 .

[0099] Please continue to see Figure 2 As shown, in some embodiments, the electrode film preparation device 100 further includes a steering roller 180 , which is disposed between the roller press 120 and the first winding roller 170 .

[0100] The steering roller 180 can change the traveling direction of the electrode film 12 output from the roller press 120 , thereby increasing the flexibility of the arrangement of the electrode film preparation device 100 and preventing the electrode film preparation device 100 from occupying too much space in the same direction.

[0101] Figure 5 The schematic diagram of the structure of the electrode preparation equipment provided in the embodiment of the present application is shown in FIG. Figure 5 The current collector 11 and the electrode film 12 are also shown by dotted lines.

[0102] See also Figure 5As shown, an embodiment of the present application also provides a pole piece preparation device 1000, which includes a pressing machine 200 and an electrode film preparation device 100 provided in the above embodiment, wherein the pressing machine 200 is arranged at the rear end of the electrode film preparation device 100, and the pressing machine 200 is used to press the current collector 11 and the electrode film 12 prepared by the electrode film preparation device 100.

[0103] The specific structure of the electrode film preparation device 100 has been described in detail in the above embodiments, and will not be repeated here.

[0104] The electrode film 12 on the first winding roller 170 is unwound, and the electrode sheet preparation equipment 1000 also includes a current collector winding roller 400, and the current collector 11 is wound on the current collector winding roller 400. The current collector 11 is unwound from the current collector winding roller 400, and the electrode film 12 and the current collector 11 are simultaneously conveyed to the pressing machine 200, and the pressing machine 200 is used to press the current collector 11 and the electrode film 12. The pressing process of the pressing machine 200 is hot pressing and laminating, and the temperature during pressing can be set to 100-180°C, so that the electrode film 12 and the current collector 11 can be reliably combined.

[0105] Please continue to see Figure 1 and Figure 5 As shown, electrode films 12 are provided on both sides of the current collector 11 . Therefore, the two electrode films 12 are respectively located on both sides of the current collector 11 , and are pressed together by a pressing machine 200 to form a pole piece 10 .

[0106] The pole piece preparation device 1000 further includes a second winding roller 300 , and the pole piece 10 pressed by the pressing machine 200 can be rolled up by the second winding roller 300 .

[0107] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. An electrode film preparation device, characterized in that: include: A screw extruder and a roller press, wherein the screw extruder comprises an extruder body and a slit extrusion head, the extruder body comprises a feed end and a discharge end, the slit extrusion head is arranged on one side of the discharge end, the slit extrusion head is arranged toward the roller press, and the width of the slit extrusion head is adjustable.

2. The electrode film preparation device according to claim 1, characterized in that: The slit extrusion head includes a bottom shell and an upper cover, and the electrode film preparation device also includes a driving member. The upper cover is arranged on the bottom shell, and the driving member is connected to the upper cover. The driving member is used to drive the upper cover to move relative to the bottom shell to adjust the distance between the upper cover and the bottom shell.

3. The electrode film preparation device according to claim 2, characterized in that: There are multiple upper covers and multiple driving members, and the upper covers and the driving members are connected one by one; The electrode film preparation device also includes a controller, each of the driving members is electrically connected to the controller, and the controller is used to control a plurality of the driving members to simultaneously drive a plurality of the upper covers to move relative to the bottom shell.

4. The electrode film preparation device according to claim 3, characterized in that: The screw extruder further comprises a material storage chamber, and the material storage chamber is located between the extruder body and the slit extrusion head.

5. The electrode film preparation device according to claim 4, characterized in that: The material storage cavity is spherical.

6. The electrode film preparation device according to any one of claims 3 to 5, characterized in that: The roller press comprises two pressing rollers, and the controller is provided with a pressing roller spacing; The controller is used to adjust the distance between the upper cover and the bottom shell according to the pressure roller distance.

7. The electrode film preparation device according to any one of claims 1 to 5, characterized in that: The electrode film preparation device further includes a plurality of conveying rollers, which are arranged in sequence between the slit extrusion head and the roller press.

8. The electrode film preparation device according to any one of claims 1 to 5, characterized in that: The electrode film preparation device also includes a first winding roller, which is arranged at the rear end of the roller press.

9. The electrode film preparation device according to claim 8, characterized in that: The electrode film preparation device further includes a steering roller, which is arranged between the roller press and the first winding roller.

10. A pole piece preparation device, characterized in that: It comprises a pressing machine and the electrode membrane preparation device as described in any one of claims 1 to 9, wherein the pressing machine is arranged at the rear end of the electrode membrane preparation device, and is used for pressing the current collector and the electrode membrane prepared by the electrode membrane preparation device.

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