Electrode film preparation device and current collector compounding device

Abstract

The utility model belongs to the technical field of secondary batteries, and discloses an electrode film preparation device and a current collector composite device.The electrode film preparation device comprises two film forming rollers, a first gap is formed between the two film forming rollers, and the two film forming rollers are used for rolling film forming raw materials passing through the first gap to form an electrode film; the bearing film supply unit is used for supplying bearing films to the two opposite sides of the electrode film, and the bearing films are attached to the surface of the electrode film to form a first film sheet; the first bearing film winding unit is used for winding the bearing film on one side of the first film to form a second film; and the electrode membrane winding and unwinding unit is at least used for winding the second membrane. According to the scheme, the breakage probability of the electrode film in the preparation process can be reduced, so that the production efficiency is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of secondary batteries, and in particular relates to an electrode film preparation device and a current collector composite device. Background Art

[0002] As an important secondary battery, lithium-ion battery has the advantages of light weight, high energy density, long cycle life and high safety performance, and has become the mainstream battery.

[0003] At present, there are two main technical routes for forming an electrode layer on a current collector: a dry method and a wet method. The wet method refers to coating the electrode slurry onto the current collector and drying it, while the dry method refers to rolling the powdered or granular electrode material into an electrode film and then compounding it with the current collector.

[0004] Compared with the wet method, the dry method does not add toxic solvents such as N-methylpyrrolidone (NMP) and deionized water, and eliminates the coating drying and solvent recovery process, which greatly reduces energy loss and manufacturing costs. It is also more environmentally friendly, and the thickness and compaction of the electrode film can be larger, which can greatly increase the energy density of the battery. However, in the process of preparing the electrode film by the dry method, the electrode film has low tensile strength and is easy to break, resulting in slow roller film forming speed and low efficiency. Utility Model Content

[0005] The utility model provides an electrode film preparation device and a current collector composite device, which are at least used to reduce the probability of the electrode film being broken during the preparation process, so as to improve the production efficiency.

[0006] In a first aspect, the utility model provides an electrode film preparation device, comprising:

[0007] Two film-forming rollers, a first gap is formed between the two film-forming rollers, and the two film-forming rollers are used to roll the film-forming raw material passing through the first gap to form an electrode film;

[0008] A carrier film supply unit, used for providing carrier films to two opposite sides of the electrode film, each of which is attached to the surface of the electrode film to form a first film sheet;

[0009] A first carrier film winding unit, used for collecting the carrier film on one side of the first film sheet to form a second film sheet;

[0010] The electrode membrane taking-up and releasing unit is at least used for taking up the second membrane sheet.

[0011] As an achievable method, the carrier film supply unit is used to provide two carrier films from upstream of the film-forming roller to the first gap, the two carrier films form a second gap at the first gap, and the two film-forming rollers are used to roll the film-forming raw material and the carrier films passing through the second gap to form the first film sheet.

[0012] As an achievable method, the carrier film supply unit includes two carrier film unloading rollers and two first reversing rollers, the two carrier film unloading rollers are disposed on both sides of the first gap, the first reversing roller is arranged between the carrier film unloading roller and the film forming roller on the same side of the first gap, and the first reversing roller is used to guide the carrier film provided by the carrier film unloading roller into the first gap.

[0013] As an implementable manner, the linear speed of the first reversing roller is greater than the linear speed of the film forming roller.

[0014] As an achievable method, the carrier film supply unit includes two carrier film unloading rollers and two calendering protection rollers, a third gap is provided between the two calendering protection rollers, the two carrier film unloading rollers are disposed on both sides of the third gap, and are used to provide the carrier film to the third gap; the two calendering protection rollers are used to roll the electrode film passing through the third gap and the carrier film to form the first film sheet.

[0015] As an implementable manner, the linear speed of the calendering protection roller is greater than the linear speed of the film-forming roller.

[0016] As an implementable manner, a first heat preservation unit is provided downstream of the carrier film supply unit, and the first heat preservation unit is used to keep the first film sheet warm.

[0017] As an achievable method, the first carrier film winding unit includes a third reversing roller and a first carrier film winding roller. The third reversing roller is arranged downstream of the first heat preservation unit, and is used to peel off the carrier film on the upper part of the first film sheet and guide it to the first carrier film winding roller for winding by the first carrier film winding roller.

[0018] In a second aspect, the utility model provides a current collector composite device, comprising two electrode film retracting units as described above, each of the electrode film retracting units being wound with the second film sheet;

[0019] A current collector supply roller, used for outputting the current collector to the outside;

[0020] Two fourth reversing rollers, a fifth gap is formed between the two fourth reversing rollers, and the two fourth reversing rollers are used to form a third membrane sheet with the current collector passing through the fifth gap and the two second membrane sheets, the two second membrane sheets are respectively arranged on both sides of the current collector, and the electrode membrane of each second membrane sheet is arranged toward the current collector;

[0021] a second carrier film winding unit, used for collecting the carrier films on both sides of the third film sheet to form a fourth film sheet;

[0022] Two composite rollers, a sixth gap is formed between the two composite rollers, and the two composite rollers are used to roll the fourth membrane sheet passing through the sixth gap to form a current collector composite membrane;

[0023] A winding device is used to wind up the current collector composite film.

[0024] As an implementable manner, a second heat preservation unit is disposed downstream of the fourth reversing roller, and the second heat preservation unit is used to keep the third membrane warm.

[0025] In the above scheme, the electrode membrane is protected by the carrier film during movement, which can reduce the probability of the electrode membrane breaking. Therefore, the rotation speed of each roller in the electrode membrane preparation device can be increased to improve production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings:

[0027] Figure 1 A schematic diagram of the structure of an electrode film preparation device provided in an embodiment of the utility model;

[0028] Figure 2 A schematic structural diagram of an electrode film preparation device provided in another embodiment of the utility model;

[0029] Figure 3 A schematic structural diagram of an electrode film preparation device provided in another embodiment of the utility model;

[0030] Figure 4 This is a schematic structural diagram of a current collector composite device provided in an embodiment of the utility model.

[0031] Description of reference numerals:

[0032] Film forming roller 1, first gap 11, first membrane sheet 12, second membrane sheet 13, electrode membrane 14, third membrane sheet 15, fourth membrane sheet 16, current collector composite membrane 17, carrier film supply unit 2, carrier film unwinding roller 21, first reversing roller 22, carrier film 23, second gap 24, calendering protection roller 25, third gap 26, hopper 3, film forming raw material 31, second reversing roller 4, first heat preservation unit 5, first heating element 51, fourth gap 52, first carrier film winding unit 6, third reversing roller 61, first carrier film winding roller 62, electrode film winding and unwinding unit 7, current collector supply roller 8, current collector 81, fifth gap 82, fourth reversing roller 83, second heat preservation unit 84, second heating element 841, seventh gap 842, carrier film winding assembly 85, second carrier film winding roller 851, fifth reversing roller 852, composite roller 86, sixth gap 861, winding device 87. DETAILED DESCRIPTION

[0033] The present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the relevant utility model, rather than to limit the utility model. It is also necessary to explain that, for ease of description, only the parts related to the utility model are shown in the accompanying drawings.

[0034] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0035] The terms used in this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The singular forms of "a", "said" and "the" used in this application and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings. It should also be understood that the term "and / or" used in this article refers to and includes any or all possible combinations of one or more associated listed items.

[0036] like Figure 1 As shown, an electrode film preparation device provided by an embodiment of the utility model includes:

[0037] There are two film-forming rollers 1 , and a first gap 11 is defined between the two film-forming rollers 1 . The two film-forming rollers 1 are used to roll the film-forming raw material 31 passing through the first gap 11 to form an electrode film 14 .

[0038] For example, but not limited to, the axes of the two film-forming rollers 1 are arranged in parallel, and, preferably, the axes of the two film-forming rollers 1 are located in the same horizontal plane. The two film-forming rollers 1 are arranged side by side in the horizontal direction to form a first gap 11 between the two film-forming rollers 1, and at least one of the two film-forming rollers 1 can move in the horizontal plane to adjust the width of the first gap 11.

[0039] Generally, a hopper 3 can be arranged above the two film-forming rollers 1, and a film-forming raw material 31 can be arranged in the hopper 3. A discharge port is opened below the hopper 3, and the discharge port faces the first gap 11. Under the action of gravity, the film-forming raw material 31 can fall into the first gap 11, and the two film-forming rollers 1 rotate towards each other to roll the film-forming raw material 31 to form an electrode film 14.

[0040] It is understandable that the film-forming raw material 31 may be a positive electrode material or a negative electrode material. Of course, in other examples, it may also be a solid electrolyte material, etc. This is only an example of the film-forming raw material 31 and is not intended to limit the film-forming raw material 31.

[0041] The film-forming raw material 31 may be a raw material that has been dried, mixed, and fiberized. The mixing may be mechanical mixing, and the fiberization may be air flow crushing, screw extrusion, open refining, ball milling, internal mixing, etc. The fiberized film-forming raw material 31 is in the form of powder, uniform block, or agglomerate.

[0042] In order to facilitate rolling the film-forming raw material 31 to form the electrode film 14, the film-forming roller 1 can use a heating roller. The heating roller mentioned here can be understood as a roller whose temperature can be controlled and is higher than the temperature of the part to be processed. For example, in this example, the temperature is higher than the temperature of the film-forming raw material 31, which is used to heat the film-forming material so that it can be rolled into the electrode film 14. Among them, a heating wire can be set in the heating roller to change the temperature of the heating roller, and a flow channel can also be set in the heating roller to change the temperature of the heating roller by passing a liquid of a certain temperature into the flow channel.

[0043] The carrier film supply unit 2 is used to provide carrier films 23 to two opposite sides of the electrode film 14 . Each of the carrier films 23 is attached to the surface of the electrode film 14 to form a first film sheet 12 .

[0044] Among them, the carrier film 23 can be a film layer that can undergo a certain degree of elastic deformation under the action of force. For example, but not limited to, the carrier film 23 can be selected from a polymer film or a non-woven fabric, and the non-woven fabric includes but is not limited to polypropylene (Polypropylene; PP)-based non-woven fabric, polyethylene (Polyethylene; PE)-based non-woven fabric, polyethylene terephthalate (PolyethyleneTerephthalate; PET)-based non-woven fabric, polyacrylonitrile (Polyacrylonitrile; PAN)-based non-woven fabric, polytetrafluoroethylene (Polytetrafluoroethylene; PTFE)-based non-woven fabric, etc.; the polymer film can be selected from polyvinylidene difluoride (Polyvinylidene Difluoride; PVDF) film, PE film, PP film, PE / PP film, PE / PP / PE film, PP / PE / PP film, PTFE film, silicone oil release film, fluorine release film, PET film, non-silicone release film, etc. It can be understood that the carrier film 23 can also be a multilayer structure composed of two or more layers of polymer films and / or non-woven fabrics. The surface of the carrier film 23 may have an anti-stick coating, so that the carrier film 23 can be peeled off from the electrode film 14 for recycling.

[0045] By arranging the supporting films 23 on the opposite sides of the electrode film 14, and the supporting films 23 can be selected from the above-mentioned films with certain elasticity, the electrode film 14 can be protected and prevented from being broken due to low tensile strength.

[0046] The first carrier film winding unit 6 is used for taking up the carrier film 23 on one side of the first film sheet 12 to form a second film sheet 13 .

[0047] It can be understood that the supporting film 23 on one side of the first film 12 is peeled off by the first supporting film winding unit 6, while the supporting film 23 on the other side is still retained, and it continues to provide a certain protection for the electrode film 14 during the subsequent winding process of the second film 13. Moreover, after the supporting film 23 on one side of the first film 12 is peeled off, the surface of the electrode film 14 originally covered by the supporting film 23 is exposed. This surface can directly contact the current collector 81 during the subsequent current collector composite process, and the current collector composite can be started without peeling off the supporting film 23 again, thereby improving the fluency of the process.

[0048] The electrode film taking-up and releasing unit 7 is at least used to take up the second film sheet 13. The electrode film taking-up and releasing unit 7 may be a roller.

[0049] In the above scheme, the electrode film 14 is protected by the carrier film 23 during movement, which can reduce the probability of the electrode film 14 being broken. Therefore, the rotation speed of each roller in the electrode film preparation device can be increased to improve production efficiency.

[0050] As an achievable method, Figure 2 As shown, the carrier film supply unit 2 is used to provide two carrier films 23 from upstream of the film-forming roller 1 to the first gap 11, and the two carrier films 23 form a second gap 24 at the first gap 11. The two film-forming rollers 1 are used to roll the film-forming raw material 31 and the carrier films 23 passing through the second gap 24 to form the first film sheet 12.

[0051] By providing two carrier films 23 to the first gap 11 upstream of the film-forming roller 1, during the preparation process, the film-forming raw material 31 directly falls into the second gap 24, and the film-forming raw material 31 is directly rolled into the electrode film 14 between the two carrier films 23, and the two carrier films 23 are rolled and bonded to both sides of the electrode film 14 under the action of the roller pressure, that is, the electrode film 14 is attached to the carrier film 23 while the electrode film 14 is being formed, and there is no period when the electrode film 14 is not protected by the carrier film 23. Therefore, the breakage of the electrode film 14 can be avoided to the greatest extent.

[0052] It should be noted that the upstream and downstream in this article can be understood as the direction along which the electrode film 14 moves is the downstream, and the direction against which the electrode film 14 moves is the upstream. For example, for two components AB, if component A is located downstream of component B, that is, component A is located on the side of component B along the direction of movement of the electrode film 14; if component A is located upstream of component B, that is, component A is located on the side of component B against the direction of movement of the electrode film 14.

[0053] As an implementation method, see also Figure 1-Figure 3 As shown in any one of the figures, the carrier film supply unit 2 includes two carrier film unloading rollers 21 and two first reversing rollers 22 , and the two carrier film unloading rollers 21 are respectively disposed on both sides of the first gap 11 .

[0054] The carrier film 23 is wound around the carrier film unwinding roller 21 , and is used to provide the carrier film 23 to the first gap 11 .

[0055] See also Figure 3 As shown, the first reversing roller 22 is arranged between the carrier film unloading roller 21 and the film forming roller 1 on the same side of the first gap 11, and the first reversing roller 22 is used to guide the carrier film 23 provided by the carrier film unloading roller 21 to enter the first gap 11.

[0056] As a feasible approach, at least Figure 3As shown, the linear speed of the first reversing roller 22 is greater than the linear speed of the film-forming roller 1. The extent to which the linear speed of the first reversing roller 22 is greater than the linear speed of the film-forming roller 1 can be determined according to actual conditions. If the film-forming material 31 has a large extension amount during the rolling process on the carrier film 23, the extent to which the linear speed of the first reversing roller 22 is greater than the linear speed of the film-forming roller 1 is relatively increased. If the film-forming material 31 has a small extension amount during the rolling process on the carrier film 23, the extent to which the linear speed of the first reversing roller 22 is greater than the linear speed of the film-forming roller 1 is relatively decreased; that is, the extent to which the linear speed of the first reversing roller 22 is greater than the linear speed of the film-forming roller 1 is positively correlated with the extension amount of the film-forming material 31 during the rolling process on the carrier film 23.

[0057] Since the linear speed of the first reversing roller 22 is greater than the linear speed of the film-forming roller 1, the speed of the carrier film 23 is slightly faster, which facilitates the extension of the film-forming material 31 on the carrier film 23. In this way, when the first film 12 is formed, the speed of the carrier film 23 is consistent with the speed of the electrode film 14, so that the electrode film 14 is attached to the carrier film 23 without breaking.

[0058] For example but not limited to, the linear speed of the first reversing roller 22 and the linear speed of the film-forming roller 1 can be accurately controlled by a servo motor, a stepping motor, or the like.

[0059] As an implementation method, see also Figure 1 As shown, the carrier film supply unit 2 includes two carrier film discharge rollers 21 and two calendering protection rollers 25, and a third gap 26 is provided between the two calendering protection rollers 25. The two carrier film discharge rollers 21 are disposed on both sides of the third gap 26 for providing the carrier film 23 to the third gap 26; the two calendering protection rollers 25 are used for rolling the electrode film 14 and the carrier film 23 passing through the third gap 26 to form the first film sheet 12.

[0060] Specifically, the calendering protection roller 25 may also be a heating roller.

[0061] As an implementable manner, the diameter of the calendering protection roller 25 is smaller than the diameter of the film-forming roller 1 .

[0062] As an implementable manner, the linear speed of the calendering protection roller 25 is greater than the linear speed of the film-forming roller 1 .

[0063] Since the linear speed of the calendering protection roller 25 is greater than the linear speed of the film-forming roller 1, the speed of the carrier film 23 is slightly faster, which facilitates the extension of the electrode film 14 on the carrier film 23. In this way, when the first film 12 is formed, the speed of the carrier film 23 is consistent with the speed of the electrode film 14, so that the electrode film 14 is attached to the carrier film 23 without breaking.

[0064] For example but not limited to, the linear speed of the calendering protection roller 25 and the linear speed of the film-forming roller 1 can be accurately controlled by a servo motor, a stepping motor, or the like.

[0065] As an implementable method, see also Figure 1-Figure 3 As shown in any one of the figures, the electrode film preparation device further includes a second reversing roller 4, which is arranged downstream of the carrier film supply unit 2 and is used to reverse the vertically moving first film sheet 12 to horizontal movement.

[0066] As an implementable manner, a first heat preservation unit 5 is disposed downstream of the carrier film supply unit 2 , and the first heat preservation unit 5 is used to keep the first film 12 warm.

[0067] Among them, Figure 1 , Figure 2 , Figure 3 As shown in any one of the figures, the second reversing roller 4 is arranged downstream of the carrier film supplying unit 2 , and the first heat preservation unit 5 is arranged downstream of the second reversing roller 4 .

[0068] By insulating the first film 12 with the first heat-insulating unit 5 , the carrier film 23 can be made more resilient, which is beneficial for subsequently peeling one layer of the carrier film 23 from the electrode film 14 .

[0069] As an implementation method, see also Figure 1-Figure 3 As shown in any one of the figures, the first heat preservation unit 5 includes first heating elements 51 arranged up and down, with a fourth gap 52 between the first heating elements 51 arranged up and down, and the first heating element 51 is used to keep the first diaphragm 12 moving horizontally and passing through the fourth gap 52 warm.

[0070] The first heating element 51 is, for example but not limited to, an electric heating element, such as a heating wire.

[0071] As an implementable method, see also Figure 1-Figure 3 As shown in any one of the figures, the first carrier film winding unit 6 includes a third reversing roller 61 and a first carrier film winding roller 62, and the third reversing roller 61 is arranged downstream of the first heat preservation unit 5, and is used to peel off the carrier film 23 on the upper part of the first film sheet 12, and guide it to the first carrier film winding roller 62 for the first carrier film winding roller 62 to be wound up.

[0072] In this example, only the carrier film 23 on the upper portion of the first film 12 is peeled off, and the carrier film 23 on the lower portion of the first film 12 is left to support the electrode film 14 and prevent the electrode film 14 from breaking.

[0073] On the second hand, see at least Figure 4As shown, the utility model provides a current collector composite device, comprising two electrode membrane retracting units 7 as described above, and each of the electrode membrane retracting units 7 is wound with the second membrane sheet 13 .

[0074] The current collector supply roller 8 is used to output the current collector 81 to the outside; the current collector 81 can be a metal foil with good conductivity and low resistivity, such as but not limited to copper foil.

[0075] Two fourth reversing rollers 83 are provided with a fifth gap 82 therebetween, and the two fourth reversing rollers 83 are used to form a third membrane 15 with the current collector 81 passing through the fifth gap 82 and the two second membrane sheets 13, and the two second membrane sheets 13 are disposed on both sides of the current collector 81, and the electrode membrane 14 of each second membrane sheet 13 is arranged toward the current collector 81.

[0076] The second carrier film winding unit is used to take up the carrier films 23 on both sides of the third film sheet 15 to form a fourth film sheet 16 .

[0077] Two composite rollers 86 , with a sixth gap 861 between the two composite rollers 86 , are used to roll the fourth membrane sheet 16 passing through the sixth gap 861 to form a current collector composite membrane 17 .

[0078] For example, but not limited to, the composite roller 86 may also be a heating roller. At least one of the two composite rollers 86 may move in the vertical direction to adjust the size of the sixth gap 861 to change the pressure of the composite roller 86 for rolling. In addition, the temperature of the composite roller 86 is adjusted to perform hot rolling to improve the bonding strength between the electrode film 14 and the current collector 81 in the current collector composite film 17.

[0079] The winding device 87 is used to wind up the current collector composite membrane 17 .

[0080] As an implementable manner, a second heat preservation unit 84 is disposed downstream of the fourth reversing roller 83 , and the second heat preservation unit 84 is used to keep the third membrane 15 warm.

[0081] By insulating the third film 15 through the second heat-insulating unit 84 , the carrier film 23 can be made more resilient, which is beneficial for subsequently peeling the carrier film 23 from the electrode film 14 .

[0082] As an implementable manner, the second heat preservation unit 84 includes second heating elements 841 disposed up and down, with a seventh gap 842 therebetween, and the second heating element 841 is used to keep the third diaphragm 15 passing through the seventh gap 842 warm.

[0083] The second heating element 841 is, for example but not limited to, an electric heating element, such as a heating wire.

[0084] As an achievable method, the second carrier film winding unit includes two carrier film winding assemblies 85, and the two carrier film winding assemblies 85 are respectively placed on both sides of the third film sheet 15, and each of the carrier film winding assemblies 85 includes a fifth reversing roller 852 and a second carrier film winding roller 851. Each of the fifth reversing rollers 852 is arranged downstream of the second heat preservation unit 84, and is respectively used to peel off the corresponding carrier films 23 on both sides of the third film sheet 15, and guide them to the corresponding second carrier film winding roller 851 for winding by the second carrier film winding roller 851.

[0085] It should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like used above to indicate positions or positional relationships are based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0086] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the utility model involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the above features are replaced with the technical features with similar functions disclosed in the present application (but not limited to) by each other.

Claims

1. An electrode film preparation device, characterized in that: include: Two film-forming rollers (1), a first gap (11) being provided between the two film-forming rollers (1), and the two film-forming rollers (1) are used to roll the film-forming raw material (31) passing through the first gap (11) to form an electrode film (14); A carrier film supply unit (2) is used to provide carrier films (23) to two opposite sides of the electrode film (14), each of the carrier films (23) being attached to a surface of the electrode film (14) to form a first film sheet (12); A first carrier film winding unit (6) is used to take up the carrier film (23) on one side of the first film sheet (12) to form a second film sheet (13); The electrode membrane taking-up and untaking-up unit (7) is used at least to take up the second membrane sheet (13).

2. The electrode film preparation device according to claim 1, characterized in that: The carrier film supply unit (2) is used to provide two carrier films (23) from upstream of the film-forming roller (1) to the first gap (11), and the two carrier films (23) form a second gap (24) at the first gap (11). The two film-forming rollers (1) are used to roll the film-forming raw material (31) and the carrier films (23) passing through the second gap (24) to form the first film sheet (12).

3. The electrode film preparation device according to claim 2, characterized in that: The carrier film supply unit (2) comprises two carrier film discharge rollers (21) and two first reversing rollers (22), the two carrier film discharge rollers (21) being disposed on both sides of the first gap (11), the first reversing roller (22) being disposed between the carrier film discharge roller (21) and the film forming roller (1) on the same side of the first gap (11), the first reversing roller (22) being used for guiding the carrier film (23) provided by the carrier film discharge roller (21) into the first gap (11).

4. The electrode film preparation device according to claim 3, characterized in that: The linear speed of the first reversing roller (22) is greater than the linear speed of the film-forming roller (1).

5. The electrode film preparation device according to claim 1, characterized in that: The carrier film supply unit (2) comprises two carrier film discharge rollers (21) and two calendering protection rollers (25), a third gap (26) is provided between the two calendering protection rollers (25), and the two carrier film discharge rollers (21) are arranged on both sides of the third gap (26) for providing the carrier film (23) to the third gap (26); the two calendering protection rollers (25) are used for rolling the electrode film (14) and the carrier film (23) passing through the third gap (26) to form the first film sheet (12).

6. The electrode film preparation device according to claim 5, characterized in that: The linear speed of the calendering protection roller (25) is greater than the linear speed of the film-forming roller (1).

7. The electrode film preparation device according to claim 1, characterized in that: A first heat preservation unit (5) is provided downstream of the carrier film supply unit (2), and the first heat preservation unit (5) is used to keep the first film sheet (12) warm.

8. The electrode film preparation device according to claim 7, characterized in that: The first carrier film winding unit (6) comprises a third reversing roller (61) and a first carrier film winding roller (62), wherein the third reversing roller (61) is arranged downstream of the first heat preservation unit (5), and is used for peeling off the carrier film (23) on the upper part of the first film sheet (12), and guiding it to the first carrier film winding roller (62) for winding by the first carrier film winding roller (62).

9. A current collector composite device, characterized in that: Comprising two electrode membrane retracting and unretracting units (7) according to any one of claims 1 to 8, each of the electrode membrane retracting and unretracting units (7) being wound with the second membrane sheet (13); A current collector supply roller (8) for outputting the current collector (81) to the outside; two fourth reversing rollers (83), a fifth gap (82) being provided between the two fourth reversing rollers (83), the two fourth reversing rollers (83) being used to form a third membrane sheet (15) with the current collector (81) passing through the fifth gap (82) and the two second membrane sheets (13), the two second membrane sheets (13) being arranged on both sides of the current collector (81), and the electrode membrane (14) of each second membrane sheet (13) being arranged toward the current collector (81); a second carrier film winding unit, used for collecting the carrier films (23) on both sides of the third film sheet (15) to form a fourth film sheet (16); two composite rollers (86), a sixth gap (861) being provided between the two composite rollers (86), and the two composite rollers (86) being used to roll the fourth membrane sheet (16) passing through the sixth gap (861) to form a current collector composite membrane (17); A winding device (87) is used to wind up the current collector composite film (17).

10. The current collector composite device according to claim 9, characterized in that: A second heat preservation unit (84) is provided downstream of the fourth reversing roller (83), and the second heat preservation unit (84) is used to keep the third membrane (15) warm.

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