Electrode sheet preparation equipment

Abstract

The present application discloses an electrode sheet preparation device. The preparation device includes an unwinding device, an impregnation and penetration device, and a cutting and winding device sequentially arranged along the conveying direction of the aluminum foil; the unwinding device is used for unwinding the aluminum foil, the impregnation and penetration device is used for forming a conductive polymer film on the surface of the unwound aluminum foil, and the cutting and winding device then cuts the aluminum foil into electrode sheets of a predetermined size for winding; the impregnation and penetration device includes a multi-stage impregnation and penetration unit, each stage of the impregnation and penetration unit includes an impregnation tank containing a conductive polymer solution and a rehydration roller group arranged in the impregnation tank; the aluminum foil is wound around the bottom of two rehydration rollers in the rehydration roller group so that the aluminum foil is immersed in the conductive polymer solution for transportation, and the liquid level of the conductive polymer solution does not exceed the central axis of the rehydration roller, and the rotation direction of the rehydration roller is opposite to the driving direction generated by the aluminum foil on the rehydration roller. The technical solution of the present application can obtain an electrode sheet with a conductive polymer film uniformly formed on the surface, thereby improving the electrical performance of the electrode sheet.

Description

Technical Field

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

[0002] Polymer organic semiconductor aluminum solid electrolytic capacitors, namely organic semiconductor (OS-CON) capacitors, use polymer materials with higher conductivity than the electrolyte of conventional aluminum electrolytic capacitors (high conductivity is achieved through doping, and its conductivity can reach more than 1000S / cm).

[0003] The traditional process is to perform conductive polymer impregnation after the preparation of the capacitor core package to form a conductive polymer film on the surface of the positive and negative electrode plates. However, the capacitor core package has a certain thickness and length of the wrapping layer. During the core package nailing and rolling process, the electrode material and the diaphragm must be wrapped with a certain degree of tightness. In addition, in the traditional impregnation process, the rubber cover is applied first and then impregnated. Since the rubber cover is close to the top of the core package, the conductive polymer material in the impregnation process only gradually and slowly penetrates from the pinholes at the bottom of the core package and the electrolytic paper on the outer layer of the core package into the tiny gaps in the electrode material layer. In this way, for capacitor core packages with larger diameters, the impregnation effect of the electrode plates is poor, and it is not easy to penetrate the entire capacitor core package. This phenomenon of impregnation impregnation makes the surface of the positive and negative electrode plates unevenly infiltrated, resulting in an increase in the internal resistance of the produced capacitor, a decrease in capacity, and a deterioration in electrical performance. Summary of the invention

[0004] The present application provides an electrode plate preparation device, which aims to solve the problem in the prior art that the conductive polymer material has a poor impregnation and penetration effect on the electrode plate, resulting in low quality and reduced performance of the produced products.

[0005] To achieve the above-mentioned purpose, the present application proposes an electrode sheet preparation device. The electrode sheet preparation device comprises an unwinding device, an impregnation and permeation device, and a cutting and winding device arranged in sequence along the conveying direction of the aluminum foil; the unwinding device is used to unwind the aluminum foil, the impregnation and permeation device is used to form a conductive polymer film on the surface of the unwound aluminum foil, and the cutting and winding device then cuts the aluminum foil into electrode sheets of predetermined size and rolls them up;

[0006] Wherein, the impregnation and permeation device includes a multi-stage impregnation and permeation unit, each stage of the impregnation and permeation unit includes an impregnation tank containing a conductive polymer solution and a fluid replenishment roller group arranged in the impregnation tank; the fluid replenishment roller group includes two fluid replenishment rollers arranged relatively horizontally, the aluminum foil is wrapped around the bottom of the two fluid replenishment rollers so that the aluminum foil is immersed in the conductive polymer solution for transportation, and the liquid level of the conductive polymer solution does not exceed the central axis of the fluid replenishment roller, and the rotation direction of the fluid replenishment roller is opposite to the driving direction generated by the aluminum foil on the fluid replenishment roller.

[0007] In some embodiments, the diameter of the replenishing roller does not exceed the depth of the immersion tank and is not less than two-thirds of the depth of the immersion tank, and the replenishing roller is arranged in the immersion tank so that its top does not exceed the slot opening of the immersion tank.

[0008] In some embodiments, the fluid replenishment roller groups in the impregnation and permeation units at each stage are driven synchronously;

[0009] The liquid replenishing rollers in each of the liquid replenishing roller groups extend to the outside of the impregnation tank and are connected to a driving member through a synchronous belt, so that the liquid replenishing rollers are synchronously driven to rotate through the driving member.

[0010] In some embodiments, each stage of the impregnation and permeation unit further includes an adjusting roller group, which is disposed above the impregnation tank and is used to adjust the film thickness of the conductive polymer solution on the surface of the aluminum foil.

[0011] In some embodiments, the adjusting roller group includes a first adjusting roller and a second adjusting roller arranged vertically and staggered, the second adjusting roller is fixedly arranged, the first adjusting roller can move laterally, and the aluminum foil is transmitted between the first adjusting roller and the second adjusting roller in an "S" shape;

[0012] Wherein, the shortest distance between the first adjusting roller and the second adjusting roller is not less than the thickness of the aluminum foil.

[0013] In some embodiments, each level of the impregnation and permeation unit further includes a dryer, and each of the dryers is connected to a corresponding adjustment roller group, respectively, for drying the aluminum foil passing through the adjustment roller group;

[0014] Wherein, each of the dryers is independently arranged, and its drying temperature can be individually adjusted.

[0015] In some embodiments, the dryer includes a plurality of dryers arranged in sequence from close to the adjusting roller group to far away from the adjusting roller group, and the drying temperature provided by each dryer tends to decrease from close to the adjusting roller group to far away from the adjusting roller group.

[0016] In some embodiments, the impregnation and permeation device further includes a pretreatment unit for surface treatment of the aluminum foil, and the aluminum foil enters the impregnation and permeation unit after passing through the pretreatment unit; the pretreatment unit includes:

[0017] A pretreatment tank containing a cleaning and modifying solution and a guide roller arranged in the pretreatment tank; the aluminum foil is wound around the bottom of the guide roller to be immersed in the cleaning and modifying solution for transportation.

[0018] In some embodiments, a plurality of rollers are provided in the unwinding device, the impregnation and penetration device, and the cutting and winding device, and the plurality of rollers are used to guide the transmission direction of the aluminum foil to complete the transportation from the unwinding device to the cutting and winding device.

[0019] In some embodiments, the cutting and rewinding device controls the unwinding speed of the unwinding device, wherein the unwinding device includes a magnetic powder brake to control the tension stability of the aluminum foil during the conveying process through the magnetic powder brake.

[0020] The technical solution of the present application proposes an electrode sheet preparation device. The electrode sheet preparation device comprises an unwinding device, an impregnation and permeation device and a cutting and winding device arranged in sequence along the conveying direction of the aluminum foil; the unwinding device is used for unwinding the aluminum foil, and after the conductive polymer film is formed on the surface of the aluminum foil by the impregnation and permeation device, the aluminum foil is cut into electrode sheets of a predetermined size by the cutting and winding device for winding; wherein the impregnation and permeation device comprises a multi-stage impregnation and permeation unit, each stage of the impregnation and permeation unit comprises an impregnation tank containing a conductive polymer solution and a liquid replenishment roller group arranged in the impregnation tank; the liquid replenishment roller group comprises two relatively horizontally arranged liquid replenishment rollers, the aluminum foil is wound around the bottom of the two liquid replenishment rollers so that the aluminum foil is immersed in the conductive polymer solution for transportation, and the liquid level of the conductive polymer solution does not exceed the central axis of the liquid replenishment roller, and the rotation direction of the liquid replenishment roller is opposite to the driving direction generated by the aluminum foil on the liquid replenishment roller.

[0021] The technical solution of the present application, through the cooperation of the unwinding device, the impregnation and penetration device and the cutting and winding device set above, completes the steps of unwinding the aluminum foil, impregnation and penetration of the conductive polymer film solution, and cutting and winding the aluminum foil. Among them, the impregnation and penetration units at each level are set by the above structure, so that the aluminum foil can be immersed in the conductive polymer solution and transmitted for a distance, thereby realizing the double-sided penetration of the aluminum foil. The liquid level of the conductive polymer solution is specially designed not to exceed the central axis of the liquid replenishment roller, and the rotation direction of the liquid replenishment roller is opposite to the driving direction of the aluminum foil on the liquid replenishment roller, so that the liquid replenishment roller can rotate and drive the conductive polymer solution to replenish the angle formed by the aluminum foil and the aluminum foil under the condition of reducing the amount of conductive polymer and reducing costs, so as to supplement the conductive polymer solution on the side of the aluminum foil close to the liquid replenishment roller, so as to further ensure that the conductive polymer solution on both sides of the aluminum foil is equal, so that the conductive polymer film formed on both sides of the aluminum foil is uniform and of equal thickness, and the electrical performance parameters of the prepared electrode sheet are improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work, among which:

[0023] Figure 1 This is a schematic diagram of the structure of an electrode sheet preparation device according to an embodiment of the present application;

[0024] Figure 2 This is a schematic diagram of the structure of the synchronous drive of the liquid replenishing roller in one embodiment of the present application;

[0025] Figure 3 This is a schematic diagram of conveying aluminum foil in an adjustment roller group according to an embodiment of the present application;

[0026] Figure 4 This is a modular schematic diagram of a dryer according to an embodiment of the present application. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only 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.

[0028] It should be noted that all directional indications in the embodiments of the present application (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0029] It should also be noted that when an element is referred to as being "fixed on" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element at the same time. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element at the same time.

[0030] In addition, the descriptions of "first", "second", etc. in this application are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0031] See also Figure 1 As shown, the present application proposes an electrode sheet preparation device 100, which has the characteristics of high integration and automation, so as to efficiently and accurately produce electrode sheets, and the prepared electrode sheets have high conductivity.

[0032] Specifically, the electrode sheet preparation equipment 100 includes an unwinding device 10, an impregnation and penetration device 20, and a cutting and winding device 30, which are sequentially arranged along the conveying direction of the aluminum foil. Among them, the unwinding device 10 is the starting part of the electrode sheet preparation equipment 100, which is responsible for the continuous unwinding of the aluminum foil. In the specific setting, a precise tension control system, such as a magnetic powder brake, can be equipped to ensure that the aluminum foil maintains a constant tension during the unwinding process, and avoid the unstable transmission of the aluminum foil caused by being too tight or too loose, which affects the subsequent processing of the aluminum foil. The impregnation and penetration device 20 is the core part of the electrode sheet preparation equipment 100, which is responsible for forming a uniform conductive polymer film on the surface of the aluminum foil, thereby improving the electrical properties of the electrode sheet through the conductive polymer film. The cutting and winding device 30 is the last part of the electrode sheet preparation equipment 100, which is responsible for cutting the aluminum foil treated by the impregnation and penetration device 20 into electrode sheets of predetermined size, and winding it up, so as to facilitate the subsequent preparation of capacitors.

[0033] The aluminum foil cutting and winding device is composed of a cutting unit, a winding unit, and a control system. These parts realize continuous conveying, precise cutting, and orderly winding of the aluminum foil through mechanical transmission and electrical control. In a further scheme, a sensor and an encoder are installed on the winding unit, which can be used to detect the conveying speed and position of the aluminum foil in real time, and a programmable logic device is used as a central controller to accurately control the operation of the cutting unit and the winding unit according to the feedback signals of the sensor and the encoder. In addition, a tension sensor and a tension controller are set on the winding unit to automatically adjust the winding speed and tension according to the tension change of the aluminum foil to maintain the flatness and tightness of the aluminum foil.

[0034] In order to achieve synchronization between cutting and rewinding, the central controller can preset parameters such as cutting width and rewinding speed to ensure that cutting and rewinding can be carried out in a predetermined rhythm. During the cutting process, the central controller adjusts the blade rotation speed according to the real-time conveying speed and position of the aluminum foil. In a specific setting, the cutting unit uses a high-precision cutting blade to ensure that the cutting edge of the aluminum foil is smooth and burr-free, and the rewinding unit uses an inflatable shaft or a mechanically locked rewinding roller to ensure that the aluminum foil can be tightly and orderly wound on the roller.

[0035] Furthermore, during the conveying process of the aluminum foil in the unwinding device 10, the impregnation device 20, and the cutting and winding device 30, a plurality of rollers 210 are provided, and the plurality of rollers 210 are mainly used to guide the conveying direction of the aluminum foil, so as to ensure that the aluminum foil can smoothly pass through each processing link according to a predetermined path. In order to avoid scratches or damage to the aluminum foil, a soft or smooth roller 210 can be selected.

[0036] The electrode plate prepared by the equipment of the present application has a conductive polymer film uniformly formed on its electrode surface. The conductive polymer film can provide additional electron transmission channels to ensure the uniform distribution and rapid transmission of electrons on the electrode surface, enhance the conductivity of the electrode, and thus complete the performance improvement of the electrode plate before the core package is nailed and rolled.

[0037] See also Figure 1 As shown, the impregnation and permeation device 20 includes a multi-stage impregnation and permeation unit 21, each stage of the impregnation and permeation unit 21 includes an impregnation tank 211 containing a conductive polymer solution and a fluid replenishment roller group arranged in the impregnation tank 211; the fluid replenishment roller group includes two relatively horizontally arranged fluid replenishment rollers 212, and the aluminum foil is wound around the bottom of the two fluid replenishment rollers 212 so that the aluminum foil is immersed in the conductive polymer solution for transportation, and the liquid level of the conductive polymer does not exceed the central axis of the fluid replenishment roller 212, and the rotation direction of the fluid replenishment roller 212 is opposite to the driving direction generated by the aluminum foil on the fluid replenishment roller 212.

[0038] In this embodiment, when the aluminum foil passes through the impregnation and permeation device 20, it will pass through the multi-stage impregnation and permeation units 21 in sequence, so as to ensure that the conductive polymer solution fully forms a conductive polymer film on the aluminum foil to improve the electrical properties of the electrode plate.

[0039] It can be understood that when the aluminum foil passes around the bottom of the two liquid replenishing rollers 212, the aluminum foil can be completely immersed in the conductive polymer solution and transported for a certain distance under the limiting and guiding action of the two liquid replenishing rollers 212, so that the two sides of the aluminum foil can be penetrated by the conductive polymer solution at the same time, and this distance is the spacing between the two liquid replenishing rollers 212.

[0040] However, when the aluminum foil is transferred out of the impregnation tank 211, because the aluminum foil is transferred close to the rehydration roller 212, at this time, under the squeezing action of the rehydration roller 212, the conductive polymer solution on the side of the aluminum foil close to the rehydration roller 212 is less than the conductive polymer solution on the side away from the rehydration roller 212, resulting in uneven distribution of the conductive polymer solution on both sides of the aluminum foil. Therefore, the rotation direction of the rehydration roller 212 is further set to be opposite to the driving direction generated by the aluminum foil on the rehydration roller 212. In this way, when the rehydration roller 212 rotates in the opposite direction, the rehydration roller 212 can drive part of the conductive polymer solution to follow and move on its surface, thereby forming a part of the conductive polymer solution transferred to the angle between the rehydration roller 212 and the aluminum foil, so as to rehydrate the side of the aluminum foil close to the rehydration roller 212. Exemplarily, if the aluminum foil in the present application is a general moving path from right to left, the rehydration roller 212 that actually performs the rehydration is the one close to the left side, and the rehydration function is performed when the aluminum foil is transferred out of the impregnation tank 211.

[0041] The conductive polymer solution is mainly composed of 85-95% poly(3,4-ethylenedioxythiophene) / 3,4-ethylenedioxythiophene monomer, 5-10% polyglycerol, 1-5% ethylene glycol, 0.1-0.5% surfactant, 0.1-3% pressure-resistant enhancer, 0.1-1% alkyl sulfonic acid, and 0.1-2.5% ammonia. Since the cost of the conductive polymer solution is relatively high, in order to save costs, not too much conductive polymer solution is provided in the actual application process, so that the liquid level of the conductive polymer does not exceed the central axis of the liquid replenishing roller 212, and the liquid replenishing roller 212 is used for the liquid replenishing operation.

[0042] In some embodiments, the diameter of the replenishing roller 212 does not exceed the depth of the immersion tank 211 and is not less than two-thirds of the depth of the immersion tank 211 , and the position of the replenishing roller 212 in the immersion tank 211 ensures that its top does not exceed the slot opening of the immersion tank 211 .

[0043] In this embodiment, the size and volume of the replenishment roller 212 are set. On the one hand, the diameter of the replenishment roller 212 is prevented from being too large, causing the replenishment roller 212 to touch the bottom of the groove, or, after the top of the replenishment roller 212 exceeds the groove, the conductive polymer solution is driven to move on its surface, causing the solution to spill out of the impregnation tank 211, resulting in solution waste; on the other hand, because the outer diameter of the replenishment roller 212 needs to be designed to be large enough, the tortuous path damage problem caused by the small diameter of the replenishment roller 212 can be reduced. Among them, in order to further reduce the damage to the aluminum foil, the surface of the replenishment roller 212 is treated, and its surface finish is "mirror".

[0044] See also Figure 2As shown, in some embodiments, the replenishment roller groups in each stage of the impregnation permeation unit 21 are driven synchronously; wherein, the replenishment roller 212 in each replenishment roller group extends to the outside of the impregnation tank 211, and is connected to the driving member 24 through a synchronous belt 23, so as to synchronously drive the replenishment roller 212 to rotate through the driving member.

[0045] In this embodiment, the refilling rollers 212 in each refilling roller group extend to the outside of the impregnation tank 211 and are connected to the driving member 24 through the synchronous belt 23. In this way, when the driving member 24 is started, all the refilling rollers 212 are driven to rotate synchronously through the synchronous belt 23, ensuring the stability and consistency of the aluminum foil during the impregnation and penetration process, improving production efficiency, and enabling the aluminum foil to maintain uniform tension and speed during the immersion and transportation process, thereby ensuring the product quality of the electrode sheet.

[0046] The driving member 24 is a servo motor or a stepping motor to ensure the rotation speed of the liquid replenishing roller 212 and provide the required torque.

[0047] See also Figure 1 As shown, in some embodiments, each level of the impregnation and permeation unit 21 further includes an adjusting roller group 213, which is disposed above the impregnation tank 211 and is used to adjust the film thickness of the conductive polymer solution on the surface of the aluminum foil.

[0048] In this embodiment, the adjusting roller group 213 is arranged above the impregnation tank 211, so that the aluminum foil can be immediately passed through the adjusting roller group 213 to adjust the film thickness after leaving the impregnation tank 211, ensuring that the aluminum foil maintains a continuous process flow during the impregnation and adjustment process, thereby improving production efficiency. Among them, by accurately controlling the parameters of the adjusting roller group 213, a uniform and stable conductive film can be obtained, thereby improving the quality and performance of the electrode sheet.

[0049] See also Figure 1 as well as Figure 3 As shown, in some embodiments, the adjusting roller group 213 includes a first adjusting roller 2131 and a second adjusting roller 2132 which are arranged vertically and staggered, the second adjusting roller 2132 is fixed, the first adjusting roller 2131 can move laterally, and the aluminum foil is transmitted in an "S" shape between the first adjusting roller 2131 and the second adjusting roller 2132; wherein the shortest distance between the first adjusting roller 2131 and the second adjusting roller 2132 is not less than the thickness of the aluminum foil.

[0050] In this embodiment, the second adjusting roller 2132 is fixedly arranged to provide a stable support surface for the aluminum foil, and cooperates with the first adjusting roller 2131 to jointly adjust the film thickness of the conductive polymer solution on the aluminum foil. The first adjusting roller 2131 can move laterally, so that the position of the first adjusting roller 2131 can be adjusted as needed to change the gap between it and the second adjusting roller 2132, thereby adjusting the film thickness of the conductive polymer solution on the aluminum foil. Since the aluminum foil is transmitted in an "S" shape, the aluminum foil will be subjected to pressure from different directions when passing through the adjusting roller group 213, and these pressures work together to make the conductive polymer solution more evenly distributed on the surface of the aluminum foil.

[0051] It is worth noting that the shortest distance between the first adjusting roller 2131 and the second adjusting roller 2132 is not less than the thickness of the aluminum foil, which can ensure that the aluminum foil can pass through the adjusting roller group 213 smoothly without being damaged due to too small a gap.

[0052] See also Figure 1 As shown, in some embodiments, each level of impregnation and permeation unit 21 also includes a dryer 214, and each dryer 214 is respectively connected to a corresponding adjustment roller group 213, and is used for drying the aluminum foil passing through the adjustment roller group 213; wherein each dryer 214 is independently arranged, and its drying temperature can be individually adjusted.

[0053] In this embodiment, the main function of the dryer 214 is to dry the aluminum foil passing through the adjustment roller group 213, remove the excess conductive polymer solution and moisture on the surface of the aluminum foil, and form a uniform and stable conductive film.

[0054] Among them, each dryer 214 is connected to the corresponding adjustment roller group 213, so that the aluminum foil immediately enters the dryer 214 for drying after the film thickness is adjusted by the adjustment roller group 213, thereby ensuring that the aluminum foil can maintain a continuous process flow during the impregnation, adjustment and drying process.

[0055] In a further design, each dryer 214 is independently arranged, so that each dryer 214 can independently adjust its drying temperature, optimize the drying process of the aluminum foil, and avoid film quality problems caused by overheating or overcooling, thereby improving the flexibility and stability of the system.

[0056] In a further configuration, the dryer 214 includes a plurality of dryers 214 sequentially arranged from close to the adjusting roller group 213 to far away from the adjusting roller group 213 , and the drying temperature provided by each dryer 214 tends to decrease from close to the adjusting roller group 213 to far away from the adjusting roller group 213 .

[0057] It is understandable that the purpose of this temperature gradient design is to optimize the drying process. When the aluminum foil just leaves the impregnation and permeation device and passes through the adjustment roller group 213, the conductive polymer film on its surface may still contain more solvent or is not completely solidified. Therefore, a higher temperature is required to accelerate the volatilization of the solvent and the solidification process of the film. As the aluminum foil continues to move forward, the conductive polymer film on its surface gradually becomes more stable. At this time, the drying temperature needs to be lowered to avoid problems such as degradation of film performance or deformation of the aluminum foil that may be caused by overheating.

[0058] See also Figure 4 As shown, in a specific setting, each dryer 214 includes an infrared drying unit 2142, a humidity sensor 2141, a humidity control module 2140 and a moving module 2143, wherein the infrared drying unit 2142 is arranged on the moving module 2143 to move toward or away from the surface of the aluminum foil under the drive of the moving module 2143, and the humidity sensor 2141 is used to detect the humidity of the surface of the aluminum foil passing through, and feed back the humidity data to the humidity control module 2140. The humidity sensor 2141 usually detects the humidity of the conductive polymer on the surface of the aluminum foil when the aluminum foil enters the dryer 214; and after analysis by the humidity control module 2140, adjusts the power of the infrared drying unit 2142 or controls the movement of the moving module 2143 to adjust the relative distance between the infrared drying unit 2142 and the surface of the aluminum foil to achieve temperature control, so that the aluminum foil can achieve a certain drying process when it is transmitted out of the dryer 214.

[0059] Specifically, the infrared drying unit 2142 heats the conductive polymer film on the surface of the aluminum foil by emitting infrared rays to achieve the purpose of drying. Among them, infrared has the characteristics of strong penetrating power, fast heating speed, high thermal efficiency, etc., which can quickly increase the temperature of the aluminum foil surface and reduce energy consumption. The humidity sensor 2141 can detect the humidity of the aluminum foil surface in real time, convert the humidity data into an electrical signal or other recognizable form, and feed the detected humidity data back to the humidity control module 2140, providing a decision basis for the control system to ensure the accuracy and stability of the drying process. The humidity control module 2140 receives the data transmitted by the humidity sensor 2141, analyzes and processes, and determines the humidity state of the conductive polymer film on the current aluminum foil surface. According to the analysis results, the relative distance between the infrared drying unit 2142 and the aluminum foil surface is adjusted by adjusting the power of the infrared drying unit 2142 or controlling the movement of the mobile module 2143, thereby controlling the drying speed and drying degree of the aluminum foil.

[0060] It can be understood that the humidity sensor 2141 in this embodiment adopts a non-contact measurement principle, which can avoid physical damage to the conductive polymer film that is not completely dried on the surface of the aluminum foil, while ensuring the accuracy and real-time nature of the measurement. The humidity control module 2140 also includes a preset humidity threshold setting unit, and the user can customize the humidity threshold according to the material, thickness and required drying degree of the conductive polymer film on the surface of the aluminum foil. The humidity control module 2140 automatically adjusts the power of the infrared drying unit 2142 or the position of the infrared drying unit 2142 according to the comparison result between the real-time humidity data and the preset threshold.

[0061] In addition, the infrared drying unit 2142 adopts multi-band infrared emission technology, and the humidity control module 2140 can intelligently select the most suitable infrared band for heating according to the humidity changes on the surface of the aluminum foil to improve drying efficiency and uniformity.

[0062] In some embodiments, the moving module 2143 includes a precise transmission mechanism and a position feedback sensor, which can ensure the accuracy and stability of the infrared drying unit 2142 during movement. The position feedback sensor feeds back real-time position information to the humidity control module 2140 to achieve closed-loop control.

[0063] In this embodiment, the design of the transmission mechanism usually uses high-precision, low-friction materials and components to reduce vibration and deviation during movement and ensure the stable operation of the infrared drying unit 2142. Among them, the material can be selected from high hardness and wear resistance, and has low thermal expansion adsorption materials to ensure that the transmission components are not easy to wear during long-term movement, maintain high-precision transmission ratio and transmission efficiency, and reduce dimensional changes caused by temperature changes, ensuring the stability and accuracy of the transmission mechanism. Some components can use rolling friction components such as rolling bearings and ball screws to reduce friction resistance and vibration, and use lubricants or self-lubricating materials such as polytetrafluoroethylene between transmission components to reduce friction adsorption, reduce wear and vibration.

[0064] In some embodiments, the humidity control module 2140 also includes a fault warning module, which can monitor the working status of the humidity sensor 2141, the infrared drying unit 2142 and the mobile module 2143 in real time. Once an abnormality is found, a warning signal is immediately issued and a backup plan is activated to ensure the continuous operation of the production line. In a further configuration, the temperature control system also includes a remote monitoring interface, allowing operators to remotely monitor the drying process, adjust parameters, and view historical data and alarm information through terminal devices such as computers and mobile phones away from the production line.

[0065] In a further configuration, because both sides of the aluminum foil have a conductive polymer layer, in order to ensure the synchronization of the drying process of the conductive polymer film on both sides of the aluminum foil, two groups of infrared drying units 2142 can be respectively provided, and the two groups of infrared drying units 2142 are relatively arranged on the opposite sides of the aluminum foil, and the two groups of infrared drying units 2142 are respectively connected to corresponding moving modules 2143. Then, the humidity control module 2140 in each controller can control the drying process on both sides at the same frequency or at different frequencies according to the humidity of the conductive polymer film layers on both sides.

[0066] In general, when multiple dryers 214 are arranged in sequence, the present application sets multiple drying sections along the conveying direction of the aluminum foil. Exemplarily, it includes a first drying section, a second drying section and a third drying section arranged in sequence from close to the adjusting roller group 213 to far away from the adjusting roller group 213; wherein the first drying section is used to provide a first drying temperature, the second drying section is used to provide a second drying temperature and the third drying section is used to provide a third drying temperature, the third drying temperature is not higher than the second drying temperature, and the second drying temperature is not higher than the first drying temperature. Among them, the second drying section is located after the first drying section, providing a lower second drying temperature. At this stage, the aluminum foil is further dried while avoiding excessive temperature from causing damage to the aluminum foil or the conductive polymer film. The third drying section is set away from the adjusting roller group 213 to provide the lowest third drying temperature. The purpose of this stage is to ensure that the aluminum foil is completely dried while maintaining the stability and performance of the conductive polymer film. Exemplarily, the temperature range of the first drying temperature is 125-150°C, the temperature range of the second drying temperature is 105-125°C, and the temperature range of the third drying temperature is 85-105°C. In this way, the use of a stepped temperature control strategy helps to avoid problems such as cracking, deformation or performance degradation of the aluminum foil due to excessive temperature during the drying process.

[0067] In some embodiments, the impregnation permeation device 20 also includes a pretreatment unit 22 for surface treatment of the aluminum foil. The aluminum foil enters the impregnation permeation unit 21 after passing through the pretreatment unit 22; the pretreatment unit 22 includes a pretreatment tank 221 containing a cleaning and modifying solution and a guide roller 222 arranged in the pretreatment tank 221; the aluminum foil is transported around the bottom of the guide roller 222 to be immersed in the cleaning and modifying solution.

[0068] In this embodiment, when the aluminum foil passes through the pretreatment unit 22, it will pass through the bottom of the guide roller 222 and be immersed in the cleaning and modification solution. In the solution, the oil stains and impurities on the surface of the aluminum foil will be removed, and the surface of the aluminum foil will be modified to improve its wettability and adhesion. The treated aluminum foil will continue to maintain its original conveying direction and enter the subsequent impregnation and permeation unit 21, so as to more evenly absorb the conductive polymer solution and form a conductive film with better quality.

[0069] The pretreatment solution is a water-based liquid containing silane or other clean and modified solutions. When making specific settings, the guide roller 222 in the pretreatment unit 22 can also be set in a similar manner to the rehydration roller group, so that the aluminum foil can be transmitted for a distance in the clean and modified solution in the pretreatment tank 221, and is synchronously driven with the rehydration roller group using a unified drive member. And an adjustment roller group 213 and a dryer 214 can be further set to guide and adjust the conveying direction of the aluminum foil and realize the drying operation. The adjustment roller group 213 and the dryer 214 can both be the setting structure of the above-mentioned impregnation and penetration unit 21.

[0070] And in the further preparation process of the capacitor, the process setting can be based on the electrode pole piece produced by this application. For example, the innovative process setting of this application is: the electrode pole piece preparation-core package nail winding-electrolyte impregnation-assembly-aging test process is set as an integrated machine. This innovative process proposed based on the electrode pole piece produced by this application not only ensures the product quality, but also reduces multiple processing steps, can reduce the length of the production line, save costs, and completely solves the technical defects of solid, semi-liquid and semi-solid products impregnated due to traditional process technology, so that such products are no longer limited by the size of capacitor products, and can be made into capacitors of any size as needed. Its electrical performance is more excellent and its scope of use is wider, such as in automotive and military products that require wide temperature, high specific capacitance and long life.

[0071] In a specific analysis, the electrode plate preparation process of the present application and the traditional impregnation process are used to manufacture semi-solid-liquid capacitor products respectively. The capacitor parameters are 450V330μF. The electrical performance parameters are tested and compared at room temperature and low temperature. The test results are shown in Table 1 and Table 2 respectively.

[0072] Table 1: Test data of semi-solid-liquid capacitors made using the electrode plates of the present invention

[0073]

[0074] Table 2: Test data of semi-solid-liquid capacitors made using traditional impregnation process

[0075]

[0076] It can be seen from Table 1 and Table 2 that at 20°C, the average capacity of the semi-solid-liquid capacitor made of the electrode plate of the present invention is 319μF, which is about 97% of the rated capacity, and the capacity loss is only 3%. It shows that the electrode plate preparation method of the present invention can fully meet the standard requirements of the product; at -55°C, the electrical properties of the product, such as capacity change (△C / C), loss (tgδ) and impedance ratio (Z-55℃ / Z20℃) all meet the product standard requirements. At 20°C, the average capacity of the semi-solid-liquid capacitor made by the traditional impregnation process is 262.2μF, which is about 79% of the rated capacity, and the capacity loss is 21%. It shows that the traditional impregnation process cannot meet the standard requirements of the product; at -55°C, the electrical performance parameters of the product, such as capacity change (△C / C), loss (tgδ) and impedance ratio (Z-55℃ / Z20℃) cannot meet the product standard requirements.

[0077] The above description is only a partial or preferred embodiment of the present application. Neither the text nor the drawings can limit the scope of protection of the present application. All equivalent structural changes made using the contents of the present application specification and drawings under the overall concept of the present application, or direct / indirect application in other related technical fields are included in the scope of protection of the present application.

Claims

1. An electrode sheet preparation device, characterized in that: It comprises an unwinding device, an impregnation and permeation device and a cutting and winding device which are sequentially arranged along the conveying direction of the aluminum foil; the unwinding device is used for unwinding the aluminum foil, the impregnation and permeation device is used for forming a conductive polymer film on the surface of the unwound aluminum foil, and the cutting and winding device then cuts the aluminum foil into electrode sheets of a predetermined size and rolls them up; The impregnation and permeation device comprises a multi-stage impregnation and permeation unit, each stage of the impregnation and permeation unit comprises an impregnation tank containing a conductive polymer solution and a fluid replenishment roller group arranged in the impregnation tank; the fluid replenishment roller group comprises two fluid replenishment rollers arranged relatively horizontally, the aluminum foil is wound around the bottom of the two fluid replenishment rollers so that the aluminum foil is immersed in the conductive polymer solution for transportation, and the liquid level of the conductive polymer solution does not exceed the central axis of the fluid replenishment roller, and the rotation direction of the fluid replenishment roller is opposite to the driving direction generated by the aluminum foil on the fluid replenishment roller; Among them, each level of the impregnation and permeation unit also includes an adjusting roller group for adjusting the film thickness of the conductive polymer solution on the surface of the aluminum foil. The adjusting roller group is arranged above the impregnation tank. The adjusting roller group includes a first adjusting roller and a second adjusting roller that are staggered and arranged up and down. The second adjusting roller is fixedly arranged, and the first adjusting roller can move laterally. The aluminum foil is transmitted between the first adjusting roller and the second adjusting roller in an "S" shape; the closest distance between the first adjusting roller and the second adjusting roller is not less than the thickness of the aluminum foil.

2. The electrode sheet preparation equipment according to claim 1, characterized in that: The diameter of the liquid replenishing roller does not exceed the depth of the immersion tank and is not less than two-thirds of the depth of the immersion tank, and the liquid replenishing roller is arranged in the immersion tank so that its top does not exceed the slot opening of the immersion tank.

3. The electrode sheet preparation equipment according to claim 2, characterized in that: The liquid replenishing roller groups in the impregnation and permeation units at each level are driven synchronously; The liquid replenishing rollers in each of the liquid replenishing roller groups extend to the outside of the impregnation tank and are connected to a driving member through a synchronous belt, so that the liquid replenishing rollers are synchronously driven to rotate through the driving member.

4. The electrode sheet preparation equipment according to claim 1, characterized in that: Each level of the impregnation and permeation unit further includes a dryer, each of which is connected to a corresponding adjustment roller group, and is used to dry the aluminum foil passing through the adjustment roller group; Wherein, each of the dryers is independently arranged, and its drying temperature can be individually adjusted.

5. The electrode sheet preparation equipment according to claim 4, characterized in that: The dryer comprises a plurality of dryers arranged in sequence from close to the adjusting roller group to far away from the adjusting roller group, and the drying temperature provided by each dryer tends to decrease from close to the adjusting roller group to far away from the adjusting roller group.

6. The electrode sheet preparation equipment according to claim 1, characterized in that: The impregnation and permeation device also includes a pretreatment unit for surface treatment of the aluminum foil, and the aluminum foil enters the impregnation and permeation unit after passing through the pretreatment unit; the pretreatment unit includes: a pretreatment tank containing a cleaning and modifying solution and a guide roller arranged in the pretreatment tank; the aluminum foil is transported around the bottom of the guide roller to be immersed in the cleaning and modifying solution.

7. The electrode sheet preparation equipment according to claim 1, characterized in that: The unwinding device, the impregnation and penetration device, and the cutting and winding device are provided with a plurality of rollers, and the plurality of rollers are used to guide the transmission direction of the aluminum foil to complete the transportation from the unwinding device to the cutting and winding device.

8. The electrode sheet preparation equipment according to claim 1, characterized in that: The cutting and winding device controls the unwinding speed of the unwinding device, wherein the unwinding device includes a magnetic powder brake to control the stability of the tension during the conveying process of the aluminum foil through the magnetic powder brake.

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