Film capacitor core winding device with preheating treatment and method and application thereof

Abstract

The invention provides a film capacitor core winding device with a preheating treatment function and a method and application thereof, and belongs to the technical field of capacitor core winding. The film capacitor core winding device comprises a winding machine box, and a first pole piece roll, a second pole piece roll and a diaphragm roll are installed at different incoming material ends in the winding machine box respectively; a first pole piece and a second pole piece are respectively wound on the first pole piece roll and the second pole piece roll, a film is wound on the diaphragm roll, the first pole piece, the second pole piece and the film are respectively connected with a clamping and cutting device through a transmission device, and the first pole piece, the second pole piece and the film are connected with a roll core through the clamping and cutting device. Preheating temperature control devices are symmetrically mounted on the two sides of the first pole piece, the second pole piece and the film respectively, and a plurality of air supply devices are mounted on the top of the inner side of the winding machine box; the problems that moisture is difficult to remove after the film is wound, and the film is locally oxidized and damaged can be solved.

Description

Technical Field

[0001] The invention relates to the technical field of power capacitor core winding, and in particular to a film capacitor core winding device with preheating treatment, a method and an application thereof. Background Art

[0002] In the manufacturing process of film capacitors and supercapacitors, the electrode and film surface will inevitably wind the trace moisture in the space into the space between the film layers of the component during the winding process. At the same time, the film and electrode themselves will also contain trace moisture. The general treatment is to evaporate the trace moisture between the core film layers and discharge it from the component by heating after the winding is completed. In this process, the trace moisture remaining between the film layers will have an adverse effect on the performance of the component. After the film is wound, the metal foil or electrode loaded with active materials is stacked and wound on each other, which significantly reduces the evaporation area and heat convection area, making it easier for moisture to be locked inside the film core, and it is often impossible to completely and effectively remove it. In the later stage, the moisture is evaporated by heating the core as a whole, but it takes a long time, and the damage to the component in the process is often irreversible, which will reduce the oxidation resistance of the membrane surface, shorten the durability, increase internal resistance loss, and affect safety.

[0003] Generally speaking, post-heat treatment of components can improve the capacitor's anti-oxidation and voltage resistance performance, but it cannot improve the damaged film part mentioned above. Summary of the invention

[0004] The purpose of the present invention is to provide a film capacitor core winding device with preheating treatment, a method and an application thereof, so as to overcome the problems existing in the prior art. The present invention can overcome the problems of difficulty in removing moisture after film winding and local oxidation damage of the film. Firstly, during the winding process, a preheating temperature control device is added to both sides of the capacitor film, metal foil or electrode, so that the capacitor film or electrode loaded with active materials can instantly remove moisture when passing through the preheating device. At the same time, the preheating process can activate the active material of the capacitor film or capacitor electrode to improve performance. Secondly, an exhaust device is added at a suitable position during the winding process, which can also discharge the moisture generated by heating, accelerate the speed of moisture escape, and extract the vaporized moisture in time, further preventing local oxidation damage of the film.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is as follows: A film capacitor core winding device with preheating treatment comprises a winding box, wherein different material supply ends inside the winding box are respectively installed with a first pole piece roll, a second pole piece roll and a diaphragm roll, the first pole piece roll and the second pole piece roll are respectively wound with a first pole piece and a second pole piece, the diaphragm roll is wound with a film, the first pole piece, the second pole piece and the film are respectively connected to a clamping and cutting device through a transmission device, the first pole piece, the second pole piece and the film are connected to a winding core through the clamping and cutting device, and preheating temperature control devices are respectively symmetrically installed on both sides of the first pole piece, the second pole piece and the film; a plurality of air supply devices are installed on the inner top of the winding box; Furthermore, a winding needle is installed inside the winding core; Further, the transmission device is a plurality of winding shafts; the preheating temperature control device is provided with a plurality of positions; Further, the preheating temperature control device includes a preheating temperature control body, a heating element is installed inside the preheating temperature control body, and the two ends of the heating element are respectively connected to the temperature control element; an air supply element is also installed inside the preheating temperature control body, and the air supply element is connected to the air volume control element; an air outlet is opened at one end of the heating element of the preheating temperature control body, and a pipe interface is opened at one end of the air supply element, and the pipe interface is connected to an air inlet pipe, and the air inlet pipe runs through the winding chassis; Further, the air supply device includes a fan, and the fan includes an air inlet and an air outlet; Furthermore, the air supply device includes a pipeline installed through the top of the winding box, and the pipeline is connected to a negative pressure air pump.

[0006] A film capacitor core winding method with preheating treatment, based on the above-mentioned film capacitor core winding device with preheating treatment, comprises the following steps: (1) Unwinding the first pole piece, the second pole piece and the film at the incoming material end of the winding machine box; (2) The first electrode piece, the second electrode piece and the film are transmitted to the clamping and cutting device through the transmission device to obtain the first electrode piece, the second electrode piece and the film from which moisture is removed, wherein, during the transmission process through the transmission device, the first electrode piece, the second electrode piece and the film are subjected to convection heating by the preheating temperature control device to generate moisture, and the moisture is discharged through the air supply device; (3) The first electrode sheet, the second electrode sheet and the film from which moisture has been removed are wound onto a winding core by a clamping and cutting device to obtain a film capacitor core; Furthermore, the temperature of the convection heating in (2) is 40-100°C.

[0007] A film capacitor core is obtained based on the above-mentioned film capacitor core winding method with preheating treatment.

[0008] An application of the above-mentioned film capacitor core in supercapacitors and lithium batteries.

[0009] The above technical solution has the following advantages or beneficial effects: The present invention provides a film capacitor core winding device with preheating treatment. Preheating is performed during the winding process by a preheating temperature control device, which can change the flexibility and ductility of the film, so that the core is wound more tightly. The tight winding structure helps to increase the capacity of the capacitor. Secondly, removing micro-water on the surface of the film by an air supply device helps to improve the surface properties of the film and prevent local oxidation and damage of the film, thereby further improving the overall quality and reliability of the capacitor. In addition, the present invention combines the dehydration process with the film capacitor winding process, so that the device can also remove micro-water on the surface of the film while winding, which not only simplifies the production process, but also significantly improves the dehydration efficiency, ensures the effective reduction of the micro-water content inside the component, and prevents local oxidation and damage of the film.

[0010] Furthermore, by introducing high-performance active materials into the pole pieces, the energy density and power density of the capacitor can be significantly improved, thereby meeting higher-demand electronic applications; the winding needle ensures that the first pole piece, the second pole piece and the film can be wound together in an orderly and tight manner to form a capacitor core.

[0011] Furthermore, the transmission device adopts a design of several winding shafts, so that the first pole piece, the second pole piece and the film can be transmitted and wound respectively through independent winding shafts, which can be flexibly adjusted, thereby avoiding the problem of misalignment or overlap between materials; the preheating temperature control device is provided with several positions, which can realize multi-point preheating treatment of the first pole piece, the second pole piece and the film during the winding process, thereby improving the efficiency of preheating.

[0012] Furthermore, the preheating temperature control device integrates heating elements and air supply elements, realizing the dual functions of heating and cooling materials such as films and electrodes. The heating temperature can be accurately adjusted through the temperature control element to ensure that the material reaches the ideal temperature range during the preheating process, thereby improving its flexibility and ductility. The air supply volume can be accurately adjusted through the air volume control element.

[0013] Furthermore, the air supply device can more effectively extract moisture and trace water in the winding box through a fan or a negative pressure air pump, accelerate the discharge of water in the box, shorten the drying time, and prevent local oxidation damage of the film.

[0014] The present invention also provides a film capacitor core winding method with preheating treatment. Through the preheating treatment, the flexibility and ductility of the material are improved, the winding process is smoother, the structure of the capacitor core is tighter and more uniform, and the performance of the capacitor is avoided during use. The air supply device is then used to accelerate the speed of moisture escape, and the vaporized moisture is extracted in time, so that the micro-water content is greatly reduced, thereby preventing local oxidation damage to the film.

[0015] Furthermore, controlling the temperature of convection heating within the range of 40~100 ℃ can effectively remove the trace water inside the first electrode, the second electrode and the film, while preventing the material from being deformed or damaged due to excessive temperature. This temperature range not only ensures the drying effect of the material, but also maintains the original performance of the material, which is beneficial to the subsequent winding operation and the improvement of capacitor performance.

[0016] The present invention also provides a film capacitor core. Due to the use of a preheating winding method, the trace water inside the film capacitor core is effectively removed, preventing the subsequent heat treatment of the capacitor core from causing local oxidation damage to the film, thereby avoiding performance degradation during use; at the same time, the preheating treatment also improves the flexibility and ductility of the material, making the structure of the capacitor core more compact and uniform, and making the performance of the core more excellent.

[0017] The present invention also provides an application of a film capacitor core in supercapacitors and lithium batteries. The tight winding structure and removal of micro-water in the core are helpful to improve energy storage performance and safe life. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of a film capacitor core winding device with preheating treatment according to the present invention; Figure 2 It is a structural schematic diagram of a preheating temperature control device of a film capacitor core winding device with preheating treatment according to the present invention; Figure 3 A schematic diagram of a process of winding a film capacitor core with preheating treatment according to the present invention; Figure 4 A schematic diagram of the structure of a film capacitor core obtained by a film capacitor core winding method with preheating treatment according to the present invention; In the figure, 1-first electrode roll; 11-first electrode; 2-second electrode roll; 21-second electrode; 3-diaphragm roll; 31-film; 4-winding shaft; 5-clamping and cutting device; 6-winding core; 61-winding needle; 7-preheating temperature control device; 71-preheating temperature control body; 72-heating element; 73-temperature control element; 74-air supply element; 75-air volume control element; 76-air outlet; 77-pipe interface; 8-air supply device; 9-active material. DETAILED DESCRIPTION

[0019] The present invention is further described in detail below in conjunction with specific embodiments, which are intended to explain the present invention rather than to limit it. In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention. It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention 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 data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0020] Embodiment 1: like Figure 1 As shown, the present invention provides a film capacitor core winding device with preheating treatment, including a winding machine box, wherein different material supply ends inside the winding machine box are respectively installed with a first pole piece roll 1, a second pole piece roll 2 and a diaphragm roll 3, the first pole piece roll 1 and the second pole piece roll 2 are respectively wound with a first pole piece 11 and a second pole piece 21, the diaphragm roll 3 is wound with a film 31, the first pole piece 11, the second pole piece 21 and the film 31 are respectively connected to a clamping and cutting device 5 through a transmission device, the transmission device is a plurality of winding shafts 4, the first pole piece 11, the second pole piece 21 and the film 31 A winding core 6 is connected through a clamping and cutting device 5, and a winding needle 61 is installed inside the winding core 6. Preheating temperature control devices 7 are symmetrically installed on both sides of the first pole piece 11, the second pole piece 21 and the film 31, so that the instantaneous surface temperature of the first pole piece 11, the second pole piece 21 and the film 31 after passing through the preheating temperature control device 7 can reach 40~100℃. The preheating temperature control device 7 is set with several positions according to the material properties; several air supply devices 8 are installed on the inner top of the winding machine box to accelerate the speed of moisture escape and extract the vaporized moisture in time; Preferably, active material 9 is provided on the surfaces of the first pole piece 11 and the second pole piece 21 .

[0021] like Figure 2 As shown, the preheating temperature control device 7 includes a preheating temperature control body 71, a heating element 72 is installed inside the preheating temperature control body 71, and both ends of the heating element 72 are respectively connected to temperature control elements 73, which can adjust the temperature; an air supply element 74 is also installed inside the preheating temperature control body 71, and the air supply element 74 is connected to an air volume control element 75; an air outlet 77 is opened at one end of the heating element 72 of the preheating temperature control body 71, and a pipe interface 76 is opened at one end of the air supply element 74, and the pipe interface 76 is connected to an air inlet pipe, and the air inlet pipe runs through the winding chassis; Preferably, the preheating temperature control device 7 has both heating and cooling functions, and can adjust the temperature according to the material, size and winding speed of the core. The heating function is specifically to adjust the heating element 72 through the temperature control element 73, adjust the air supply element 74 to blow air through the air volume control element 75, and deliver the hot air through the air outlet 77 to achieve the heating effect; the cooling function is specifically to not start the heating element 72 and the temperature control element 73, the external air enters the duct interface 76 through the air inlet pipe, the air supply element 74 is adjusted to blow air through the air volume control element 75, and the hot air is delivered through the air outlet 77 to achieve the cooling effect.

[0022] Embodiment 2: like Figure 1 As shown, the present invention provides a film capacitor core winding device with preheating treatment, including a winding machine box, wherein different material supply ends inside the winding machine box are respectively installed with a first pole piece roll 1, a second pole piece roll 2 and a diaphragm roll 3, the first pole piece roll 1 and the second pole piece roll 2 are respectively wound with a first pole piece 11 and a second pole piece 21, the diaphragm roll 3 is wound with a film 31, the first pole piece 11, the second pole piece 21 and the film 31 are respectively connected to a clamping and cutting device 5 through a transmission device, and the transmission device is a plurality of windings The winding shaft 4, the first pole piece 11, the second pole piece 21 and the film 31 are connected to the winding core 6 through the clamping and cutting device 5, and the winding core 6 is installed with a winding needle 61. The first pole piece 11, the second pole piece 21 and the film 31 are symmetrically installed on both sides of the preheating temperature control device 7, and the preheating temperature control device 7 is provided with a plurality of sites; a plurality of air supply devices 8 are installed on the top of the inner side of the winding machine box, and the air supply device 8 includes a fan, and the fan includes an air inlet and an air outlet, and the air inlet and the air outlet are respectively connected with pipes; Preferably, active material 9 is provided on the surfaces of the first pole piece 11 and the second pole piece 21 .

[0023] like Figure 2As shown, the preheating temperature control device 7 includes a preheating temperature control body 71, a heating element 72 is installed inside the preheating temperature control body 71, and the two ends of the heating element 72 are respectively connected to the temperature control elements 73; an air supply element 74 is also installed inside the preheating temperature control body 71, and the air supply element 74 is connected to the air volume control element 75; an air outlet 77 is opened at one end of the heating element 72 of the preheating temperature control body 71, and a pipe interface 76 is opened at one end of the air supply element 74, and the pipe interface 76 is connected to the air inlet pipe, and the air inlet pipe runs through the winding chassis.

[0024] Embodiment 3: like Figure 1 As shown, the present invention provides a film capacitor core winding device with preheating treatment, including a winding machine box, wherein different material supply ends inside the winding machine box are respectively installed with a first pole piece roll 1, a second pole piece roll 2 and a diaphragm roll 3, the first pole piece roll 1 and the second pole piece roll 2 are respectively wound with a first pole piece 11 and a second pole piece 21, the diaphragm roll 3 is wound with a film 31, the first pole piece 11, the second pole piece 21 and the film 31 are respectively connected to a clamping and cutting device 5 through a transmission device, and the transmission device is a plurality of A winding shaft 4, a first pole piece 11, a second pole piece 21 and a film 31 are connected to a winding core 6 through a clamping and cutting device 5, a winding needle 61 is installed inside the winding core 6, and preheating temperature control devices 7 are symmetrically installed on both sides of the first pole piece 11, the second pole piece 21 and the film 31, and the preheating temperature control device 7 is provided with a plurality of sites; a plurality of air supply devices 8 are installed on the top of the inner side of the winding machine box, and the air supply device 8 includes a pipeline installed through the top of the winding machine box, and the pipeline is connected to a negative pressure air pump; Preferably, active material 9 is provided on the surfaces of the first pole piece 11 and the second pole piece 21 .

[0025] like Figure 2 As shown, the preheating temperature control device 7 includes a preheating temperature control body 71, a heating element 72 is installed inside the preheating temperature control body 71, and the two ends of the heating element 72 are respectively connected to the temperature control elements 73; an air supply element 74 is also installed inside the preheating temperature control body 71, and the air supply element 74 is connected to the air volume control element 75; an air outlet 77 is opened at one end of the heating element 72 of the preheating temperature control body 71, and a pipe interface 76 is opened at one end of the air supply element 74, and the pipe interface 76 is connected to the air inlet pipe, and the air inlet pipe runs through the winding chassis.

[0026] Embodiment 4: like Figure 3 As shown, a film capacitor core winding method with preheating treatment, based on the above-mentioned film capacitor core winding device with preheating treatment, includes the following steps: (1) Unwinding the first pole piece 11, the second pole piece 21 and the film 31 at the incoming end of the winding machine box; (2) The first electrode 11, the second electrode 21 and the film 31 are transmitted to the clamping and cutting device 5 through the transmission device to obtain the first electrode 11, the second electrode 21 and the film 31 with moisture removed, wherein, during the transmission process through the transmission device, the first electrode 11, the second electrode 21 and the film 31 are convectively heated to 40-100°C by the preheating temperature control device 7 to generate moisture, and the moisture is released by the air supply device 8; the present invention combines the dehydration process with the film capacitor winding process, thereby achieving the removal of micro-water on the surface of the first electrode 11, the second electrode 21 and the film 31 during winding, reducing the micro-water content inside the element, improving the dehydration efficiency and effect, and improving the surface properties of the first electrode 11, the second electrode 21 and the film 31; the winding preheating process can change the flexibility and ductility of the first electrode 11, the second electrode 21 and the film 31, so that the core winding is more compact, and at the same time, for the supercapacitor, the capacitance can be increased; (3) The first electrode sheet 11 , the second electrode sheet 21 , and the film 31 from which moisture has been removed are wound onto the winding core 6 by the clamping and cutting device 5 to obtain a core.

[0027] Embodiment 5: like Figure 3 As shown, a film capacitor core winding method with preheating treatment, based on the above-mentioned film capacitor core winding device with preheating treatment, includes the following steps: (1) Unwinding the first pole piece 11, the second pole piece 21 and the film 31 at the incoming end of the winding machine box; (2) The first electrode piece 11, the second electrode piece 21 and the film 31 are transmitted to the clamping and cutting device 5 through the transmission device to obtain the first electrode piece 11, the second electrode piece 21 and the film 31 from which moisture is removed. In the process of transmission through the transmission device, the first electrode piece 11, the second electrode piece 21 and the film 31 are convectively heated to 40° C. by the preheating temperature control device 7 to generate moisture, which is discharged through the air supply device 8; Specifically, the heating temperature of the heating element 72 is controlled to be 40° C. by adjusting the temperature control element 73; (3) The first electrode sheet 11 , the second electrode sheet 21 , and the film 31 , from which moisture has been removed, are wound onto the winding core 6 by the clamping and cutting device 5 , thereby obtaining a film capacitor core.

[0028] Embodiment 6: like Figure 3 As shown, a film capacitor core winding method with preheating treatment, based on the above-mentioned film capacitor core winding device with preheating treatment, includes the following steps: (1) Unwinding the first pole piece 11, the second pole piece 21 and the film 31 at the incoming end of the winding machine box; (2) The first electrode piece 11, the second electrode piece 21 and the film 31 are transmitted to the clamping and cutting device 5 through the transmission device to obtain the first electrode piece 11, the second electrode piece 21 and the film 31 from which moisture is removed. In the process of transmission through the transmission device, the first electrode piece 11, the second electrode piece 21 and the film 31 are convectively heated to 60° C. by the preheating temperature control device 7 to generate moisture, which is discharged through the air supply device 8; Specifically, the heating temperature of the heating element 72 is controlled to be 60° C. by adjusting the temperature control element 73; (3) The first electrode sheet 11 , the second electrode sheet 21 , and the film 31 , from which moisture has been removed, are wound onto the winding core 6 by the clamping and cutting device 5 , thereby obtaining a film capacitor core.

[0029] Embodiment 7: like Figure 3 As shown, a film capacitor core winding method with preheating treatment, based on the above-mentioned film capacitor core winding device with preheating treatment, includes the following steps: (1) Unwinding the first pole piece 11, the second pole piece 21 and the film 31 at the incoming end of the winding machine box; (2) The first electrode piece 11, the second electrode piece 21 and the film 31 are transmitted to the clamping and cutting device 5 through the transmission device to obtain the first electrode piece 11, the second electrode piece 21 and the film 31 from which moisture is removed. In the process of transmission through the transmission device, the first electrode piece 11, the second electrode piece 21 and the film 31 are convectively heated to 100° C. by the preheating temperature control device 7 to generate moisture, which is discharged through the air supply device 8; Specifically, the heating temperature of the heating element 72 is controlled to be 100° C. by adjusting the temperature control element 73; (3) The first electrode sheet 11 , the second electrode sheet 21 , and the film 31 , from which moisture has been removed, are wound onto the winding core 6 by the clamping and cutting device 5 , thereby obtaining a film capacitor core.

[0030] Embodiment 8: like Figure 4 As shown, a film capacitor core is obtained based on the above-mentioned film capacitor core winding method with preheating treatment. The micro water inside the film capacitor core is effectively removed to prevent the film from being locally oxidized and damaged, thereby avoiding the performance degradation of the capacitor during use; at the same time, the preheating treatment also improves the flexibility and ductility of the material, making the structure of the capacitor core more compact and uniform, and making the performance of the core more excellent.

[0031] The film capacitor core can be used in supercapacitors and lithium batteries. The tight winding structure and removal of micro-water in the core help to improve energy storage performance and safe life.

[0032] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention 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 invention.

Claims

1. A film capacitor core winding device with preheating treatment, characterized in that: The invention comprises a winding machine box, wherein different material input ends of the winding machine box are respectively installed with a first pole piece roll (1), a second pole piece roll (2) and a diaphragm roll (3), the first pole piece roll (1) and the second pole piece roll (2) are respectively wound with a first pole piece (11) and a second pole piece (21), the diaphragm roll (3) is wound with a film (31), the first pole piece (11), the second pole piece (21) and the film (31) are respectively connected to a clamping and cutting device (5) through a transmission device, the first pole piece (11), the second pole piece (21) and the film (31) are respectively connected to a winding core (6) through the clamping and cutting device (5), and preheating temperature control devices (7) are respectively symmetrically installed on both sides of the first pole piece (11), the second pole piece (21) and the film (31); and a plurality of air supply devices (8) are installed on the inner top of the winding machine box.

2. A film capacitor core winding device with preheating treatment according to claim 1, characterized in that: A winding needle (61) is installed inside the winding core (6).

3. A film capacitor core winding device with preheating treatment according to claim 1, characterized in that: The transmission device is a plurality of winding shafts (4); and the preheating temperature control device (7) is provided with a plurality of positions.

4. A film capacitor core winding device with preheating treatment according to claim 1, characterized in that: The preheating temperature control device (7) comprises a preheating temperature control body (71), a heating element (72) being installed inside the preheating temperature control body (71), and temperature control elements (73) being connected to both ends of the heating element (72); an air supply element (74) being installed inside the preheating temperature control body (71), and the air supply element (74) being connected to an air volume control element (75); an air outlet (77) being provided at one end of the heating element (72) of the preheating temperature control body (71), and a pipe interface (76) being provided at one end of the air supply element (74), and an air inlet pipe being connected to the pipe interface (76), and the air inlet pipe passing through the winding chassis.

5. The film capacitor core winding device with preheating treatment according to claim 1, characterized in that: The air supply device (8) comprises a fan, and the fan comprises an air inlet and an air outlet.

6. The film capacitor core winding device with preheating treatment according to claim 1, characterized in that: The air supply device (8) comprises a pipeline installed through the top of the winding machine box, and the pipeline is connected to a negative pressure air pump.

7. A film capacitor core winding method with preheating treatment, based on a film capacitor core winding device with preheating treatment according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1, unwinding the first pole piece (11), the second pole piece (21) and the film (31) at the material inlet end of the winding machine box; S2, the first pole piece (11), the second pole piece (21) and the film (31) are transmitted to the clamping and cutting device (5) through the transmission device (4) to obtain the first pole piece (11), the second pole piece (21) and the film (31) from which moisture is removed, wherein, during the transmission process through the transmission device (4), the first pole piece (11), the second pole piece (21) and the film (31) are subjected to convection heating by the preheating temperature control device (7) to generate moisture, and the moisture is discharged through the air supply device (8); S3, the first pole piece (11), the second pole piece (21), and the film (31) from which moisture has been removed are wound onto a winding core (6) by a clamping and cutting device (5), thereby obtaining a film capacitor core.

8. The film capacitor core winding method with preheating treatment according to claim 1, characterized in that: The temperature for convection heating in S2 is 40-100°C.

9. A film capacitor core, obtained based on the film capacitor core winding method with preheating treatment according to any one of claims 7 to 8.

10. Use of a film capacitor core according to claim 9 in supercapacitors and lithium batteries.

Images