Electrode tab manufacturing equipment

Abstract

An electrode tab manufacturing apparatus is provided that can obtain an electrode tab having a conductive polymer film uniformly formed on its surface, thereby improving the electrical performance of the electrode tab. 【Solution means】In the electrode tab manufacturing apparatus 100, the feeding device 10 is used for continuously feeding an aluminum foil. The impregnation and penetration device 20 includes a multi-stage impregnation and penetration unit 21 and a dryer 214. Each stage of the impregnation and penetration unit includes an impregnation tank 211 for containing a conductive polymer solution and a replenishing roller group provided in the impregnation tank. The aluminum foil bypasses the bottom of two replenishing rollers 212 in the replenishing roller group so as to be immersed in and transported by the conductive polymer solution. The liquid level height of the conductive polymer solution does not exceed the central axis of the replenishing roller, and the rotation direction of the replenishing roller is opposite to the driving direction caused by the action of the aluminum foil on the replenishing roller. The cutting and winding device 30 cuts the aluminum foil into electrode tabs of a predetermined size and winds them up.

Description

Technical Field

[0001] This application relates to the technical field of capacitors, and particularly to electrode tab manufacturing equipment.

Background Art

[0002] The electrolyte of a polymer organic semiconductor aluminum solid electrolytic capacitor, i.e., an organic semiconductor (Organic semi - conductor, OS - CON) capacitor, uses a polymer material with higher conductivity than the electrolytic solution of a conventional aluminum electrolytic capacitor (which can reach a highly conductive state through doping and its conductivity can reach 1000 S / cm or more).

[0003] In the conventional process, after the manufacture of the capacitor core wrap is completed, conductive polymer impregnation is performed to form a conductive polymer film on the surfaces of the positive and negative electrode sheets. However, the capacitor core wrap has a certain thickness and length of the winding layer, and in the process of nailing the core wrap, a certain winding tightness is required when wrapping the electrode material and the separator. Furthermore, in the conventional impregnation technology, impregnation is carried out after first covering with a rubber cover, and since the rubber cover is in close contact with the top of the core wrap, during impregnation, the conductive polymer material only gradually penetrates into the micro - gaps of the electrode material layer from the pinholes at the bottom of the core wrap and the electrolytic paper in the outer layer of the core wrap. As a result, for a capacitor core wrap with a large diameter, the impregnation effect of its electrode tab is poor, and it is difficult to penetrate the entire capacitor core wrap. Due to this impregnation non - permeation phenomenon, the impregnation on the surfaces of the positive and negative electrode tabs becomes uneven, and the capacitors produced have an increased internal resistance, a decreased capacitance, and deteriorated electrical performance.

Summary of the Invention

Problems to be Solved by the Invention

[0004] This application provides electrode tab manufacturing equipment to solve the problems in the prior art that the impregnation and penetration effect of the conductive polymer material into the electrode tab is not good, the quality of the produced products is not high, and the performance deteriorates.

Means for Solving the Problems

[0005] In order to achieve the above object, the present application provides an electrode tab manufacturing apparatus, which includes a feeding device, an impregnation device, and a cutting and winding device that are sequentially provided along the transport direction of an aluminum foil. The feeding device is used for feeding the aluminum foil. The impregnation device is used for forming a conductive polymer film on the surface of the fed aluminum foil. The cutting and winding device then cuts and winds the aluminum foil into electrode tabs of a predetermined size. The impregnation device includes multiple stages of impregnation units. Each stage of the impregnation unit includes an impregnation tank for containing a conductive polymer solution and a replenishing roller group provided in the impregnation tank. The replenishing roller group includes two horizontally provided replenishing rollers. The aluminum foil bypasses the bottoms of the two replenishing rollers so as to be transported while immersed in the conductive polymer solution. The liquid level height of the conductive polymer solution does not exceed the central axis of the replenishing roller. The rotation direction of the replenishing roller is opposite to the driving direction caused by the action of the aluminum foil on the replenishing roller. An electrode tab manufacturing apparatus is proposed.

[0006] In some embodiments, the diameter of the replenishing roller does not exceed the depth of the impregnation tank and is not less than two-thirds of the depth of the impregnation tank, and the top of the replenishing roller does not exceed the tank opening of the impregnation tank according to the installation position of the replenishing roller in the impregnation tank.

[0007] In some embodiments, the replenishing roller groups in each stage of the impregnation unit are synchronously driven. The replenishing rollers in each replenishing roller group extend outside the impregnation tank and are connected to a driving member via a timing belt, and the replenishing rollers are synchronously driven to rotate via the driving member.

[0008] In some embodiments, each stage of the impregnation unit further includes an adjustment roller group provided above the impregnation tank for adjusting the film formation thickness of the conductive polymer solution on the surface of the aluminum foil.

[0009] In some embodiments, the adjustment roller group includes a first adjustment roller and a second adjustment roller which are provided with a vertical displacement therebetween, the second adjustment roller is fixedly provided, the first adjustment roller is movable in the lateral direction, and the aluminum foil is conveyed in an "S" shape between the first adjustment roller and the second adjustment roller. The closest distance between the first adjustment roller and the second adjustment roller is not less than the thickness of the aluminum foil.

[0010] In some embodiments, each stage of the impregnation and penetration unit further includes a dryer for performing a drying operation on the aluminum foil that has passed through the adjustment roller group and is respectively connected to the corresponding adjustment roller group. Each of the dryers is independently provided and can adjust its drying temperature independently.

[0011] In some embodiments, the dryer includes a plurality of dryers provided in sequence in a direction away from the adjustment roller group, and the drying temperature provided by each dryer tends to decrease in a direction away from the adjustment roller group.

[0012] In some embodiments, the impregnation and penetration device further includes a pretreatment unit for surface treatment of the aluminum foil. After passing through the pretreatment unit, the aluminum foil enters the impregnation and penetration unit. The pretreatment unit includes a pretreatment tank for containing a cleaning and reforming solution and a guide roller provided in the pretreatment tank. The aluminum foil is conveyed by being immersed in the cleaning and reforming solution and bypasses through the bottom of the guide roller.

[0013] In some embodiments, a plurality of threading rollers are provided in the feeding device, the impregnation and penetration device, and the cutting and winding device. The plurality of threading rollers are used to guide the conveying direction of the aluminum foil and perform transportation between the feeding device and the cutting and winding device.

[0014] In some embodiments, the cutting and winding device controls the feeding speed of the feeding device. The feeding device includes a magnetic powder brake, and the magnetic powder brake controls the tension stability during the transportation of the aluminum foil.

[0015] The technical solution of this application proposes an electrode tab manufacturing device. The electrode tab manufacturing device includes a feeding device, an impregnation device, and a cutting and winding device that are sequentially arranged along the aluminum foil transportation direction. The feeding device is used for feeding the aluminum foil. After the impregnation device forms a conductive polymer film on the surface of the aluminum foil, the cutting and winding device cuts and winds the aluminum foil into electrode tabs of a predetermined size. The impregnation device includes multiple stages of impregnation units. Each stage of impregnation unit includes an impregnation tank for containing a conductive polymer solution and a replenishing roller group provided in the impregnation tank. The replenishing roller group includes two horizontally arranged replenishing rollers. The aluminum foil bypasses the bottoms of the two replenishing rollers so as to be immersed in and transported by the conductive polymer solution. The liquid level height of the conductive polymer solution does not exceed the central axis of the replenishing roller, and the rotation direction of the replenishing roller is opposite to the driving direction caused by the action of the aluminum foil on the replenishing roller.

Effects of the Invention

[0016] The technical solution of this application completes the steps of feeding the aluminum foil, impregnating and permeating the conductive polymer film solution, and cutting and winding the aluminum foil by the cooperation of the above-provided feeding device, impregnating and permeating device, and cutting and winding device. With the above configuration, each impregnating and permeating unit can transport the aluminum foil a certain distance so as to immerse it in the conductive polymer solution, thereby realizing the penetration on both sides of the aluminum foil. In particular, the liquid level height of the conductive polymer solution does not exceed the central axis of the liquid replenishing roller, and the rotation direction of the liquid replenishing roller is designed to be opposite to the driving direction caused by the action of the aluminum foil on the liquid replenishing roller, so as to reduce the usage amount of the conductive polymer and reduce the cost. The liquid replenishing roller rotates to replenish the conductive polymer solution into the clamping angle formed with the aluminum foil, and can replenish the conductive polymer solution to the side of the aluminum foil close to the liquid replenishing roller, and further ensure that the amounts of the conductive polymer solutions on both sides of the aluminum foil are the same, so that the conductive polymer films formed on both sides of the aluminum foil are uniform and of equal thickness, improving the electrical performance parameters of the manufactured electrode tab.

Brief Description of the Drawings

[0017] To more clearly explain the technical solutions in the embodiments of this application or the prior art, the drawings that need to be used in the following description of the embodiments or the prior art will be briefly described. Obviously, the drawings in the following description are only some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without creative labor.

Figure 1

Figure 2

Figure 3

Figure 4

Modes for Carrying Out the Invention

[0018] The following clearly and completely describes the technical solution of the embodiments of the present application in connection with the drawings of the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the present application.

[0019] It should be noted that all direction indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative positional relationship and movement status between various components in a specific posture (as shown in the drawings). When the specific posture changes, the direction indications also change accordingly.

[0020] Furthermore, it should be noted that when an element is referred to as being "fixed to" or "installed on" another element, it may be directly located on the other element, or a central element may exist simultaneously. When an element is referred to as being "connected to" another element, it may be directly connected to the other element, or a central element may exist simultaneously.

[0021] Also, the descriptions regarding "first", "second", etc. in this specification are only for the purpose of explanation, and it is impossible to understand that they indicate or imply relative importance or implicitly indicate the number of the indicated technical features. Therefore, the features defined by "first" and "second" can include at least one feature explicitly or implicitly. In addition, the technical solutions between the embodiments can be combined with each other, but it must be based on what can be realized by those skilled in the art. If contradictions occur or the combination cannot be realized in the combination of technical solutions, such a combination of technical solutions does not exist and is considered not within the protection scope required by the present application.

[0022] As shown in FIG. 1, the present application proposes an electrode tab manufacturing apparatus 100 with high integration and automation features for efficiently and accurately producing electrode tabs, and the manufactured electrode tabs have high conductivity.

[0023] Specifically, the electrode tab manufacturing equipment 100 includes a feeding device 10, an impregnation and penetration device 20, and a cutting and winding device 30, which are provided in sequence along the transport direction of the aluminum foil. The feeding device 10 is at the starting part of the electrode tab manufacturing equipment 100 and is used for continuous feeding of the aluminum foil. In a specific configuration, it is equipped with an accurate tension control system such as a magnetic powder brake to ensure that the aluminum foil maintains a certain tension during feeding, and to avoid the influence of transport instability of the aluminum foil caused by excessive tightening or loosening on the subsequent processing of the aluminum foil. The impregnation and penetration device 20 is an important part of the electrode tab manufacturing equipment 100 and is used to form a uniform conductive polymer film on the surface of the aluminum foil, thereby improving the electrical performance of the electrode tab by the conductive polymer film. The cutting and winding device 30 is at the last part of the electrode tab manufacturing equipment 100 and is used to cut and wind the aluminum foil processed by the impregnation and penetration device 20 into electrode tabs of a predetermined size, facilitating the subsequent manufacturing of capacitors.

[0024] The aluminum foil cutting and winding device is composed of parts such as a cutting unit, a winding unit, and a control system. These parts can realize continuous transport, accurate cutting, and orderly winding of the aluminum foil through mechanical transmission and electrical control. In a further solution, sensors and encoders for detecting the transport speed and position of the aluminum foil in real time are installed in the winding unit. A programmable logic device is adopted as the central controller, and based on the feedback signals of the sensors and encoders, the operations of the cutting unit and the winding unit can be accurately controlled. In addition, a tension sensor and a tension controller are provided in the winding unit to automatically adjust the winding speed and tension according to the tension change of the aluminum foil, maintaining the flatness and tightness of the aluminum foil.

[0025] To achieve the synchronization of cutting and winding, parameters such as the cutting width and winding speed are preset through the central controller to ensure that cutting and winding can be carried out at a predetermined rhythm. During the cutting process, the central controller adjusts the rotation speed of the blade so as to suit the real-time transport speed and position of the aluminum foil. In one specific configuration, the cutting unit adopts a high-precision cutting blade to ensure that the cutting edge of the aluminum foil is flat and free of burrs. The winding unit adopts an air shaft or a mechanically locked winding roller to ensure that the aluminum foil can be tightly and orderly wound around the roller.

[0026] Furthermore, during the transport process in the aluminum foil feeding device 10, the impregnation device 20, and the cutting and winding device 30, a plurality of guide rollers 210 are provided. The plurality of guide rollers 210 are mainly used to guide the transport direction of the aluminum foil, ensuring that the aluminum foil can smoothly pass through each processing stage along a predetermined path. To avoid scratches and damage to the aluminum foil, soft or smooth-surfaced guide rollers 210 can be selected and used.

[0027] The electrode tabs manufactured by the equipment of the present application can uniformly form a conductive polymer film on the surface of the electrode, providing an additional electron transport path through the conductive polymer film, ensuring the uniform distribution and high-speed transport of electrons on the surface of the electrode, enhancing the conductivity of the electrode, and thereby achieving the performance improvement of the electrode tabs before the core wrap is stapled.

[0028] As shown in FIG. 1, the impregnation device 20 includes multiple stages of impregnation units 21. Each stage of the impregnation unit 21 includes an impregnation tank 211 for containing the conductive polymer solution and a replenishing roller group provided in the impregnation tank 211. The replenishing roller group includes two horizontally provided replenishing rollers 212. The aluminum foil bypasses the bottom of the two replenishing rollers 212 so as to be immersed and transported in the conductive polymer solution. The liquid level height of the conductive polymer does not exceed the central axis of the replenishing roller 212, and the rotation direction of the replenishing roller 212 is opposite to the driving direction caused by the action of the aluminum foil on the replenishing roller 212.

[0029] In this embodiment, when the aluminum foil passes through the impregnation and penetration device 20, by sequentially passing through the multi-stage impregnation and penetration unit 21, it is ensured that a sufficiently conductive polymer film is formed on the aluminum foil with the conductive polymer solution, improving the electrical properties of the electrode tab.

[0030] As can be understood, when the aluminum foil bypasses the bottom of the two replenishing liquid rollers 212, under the limiting guide action of the two replenishing liquid rollers 212, it can be transported a certain distance so as to be completely immersed in the conductive polymer solution, and the two surfaces of the aluminum foil can be simultaneously penetrated by the conductive polymer solution, and this distance is the interval distance between the two replenishing liquid rollers 212.

[0031] However, when the aluminum foil is discharged from the impregnation tank 211, it is conveyed in close contact with the replenishing liquid roller 212. At this time, under the extrusion action of the replenishing liquid roller 212, the conductive polymer solution on the side surface of the aluminum foil close to the replenishing liquid roller 212 is less than that on the side surface away from the replenishing liquid roller 212, and the distribution of the conductive polymer solution on both side surfaces of the aluminum foil becomes non-uniform. Therefore, the rotation direction of the replenishing liquid roller 212 is further made opposite to the driving direction caused by the action of the aluminum foil on the replenishing liquid roller 212. In this way, when the replenishing liquid roller 212 rotates in the reverse direction, the replenishing liquid roller 212 can cause a part of the conductive polymer solution on its surface to move followingly, thereby moving a part of the conductive polymer solution into the included angle between the replenishing liquid roller 212 and the aluminum foil, thereby replenishing the side of the aluminum foil close to the replenishing liquid roller 212. Exemplarily, if the aluminum foil in the present application has a substantially moving path from right to left, the replenishing liquid roller 212 that actually replenishes the liquid is the one closer to the left side, and it performs the replenishing liquid function when the aluminum foil is discharged from the impregnation tank 211.

[0032] The percentage composition of the conductive polymer solution is mainly 85 - 95% of poly(3,4-ethylenedioxythiophene) / 3,4-ethylenedioxythiophene monomer, 5 - 10% of polyglycerin, 1 - 5% of ethylene glycol, 0.1 - 0.5% of surfactant, 0.1 - 3% of pressure resistance improver, 0.1 - 1% of alkylsulfonic acid, and 0.1 - 2.5% of aqueous ammonia. Since the cost of the conductive polymer solution is high, in order to save cost and use less conductive polymer solution in the actual application process, the liquid level height of the conductive polymer does not exceed the central axis of the replenishing roller 212, and a configuration form for performing the replenishing operation with the replenishing roller 212 is formed.

[0033] In some embodiments, the replenishing roller 212 has a diameter that does not exceed the depth of the impregnation tank 211 and is not less than two-thirds of the depth of the impregnation tank 211, and depending on the installation position of the replenishing roller 212 in the impregnation tank 211, its top does not exceed the tank opening of the impregnation tank 211.

[0034] In this embodiment, the size and volume of the replenishing roller 212 are set. If the diameter of the replenishing roller 212 is too large, to prevent the replenishing roller 212 from contacting the bottom of the tank, or if the top of the replenishing roller 212 exceeds the tank opening, during the process of causing the conductive polymer solution to follow and move on its surface, the solution will spill out of the impregnation groove 211, preventing the waste of the solution. Also, in order to reduce the problem of bending diameter damage to the aluminum foil material caused by the diameter of the replenishing roller 212 being too small, it is necessary to design the outer diameter of the replenishing roller 212 to be sufficiently large. Furthermore, to reduce the damage to the aluminum foil, the surface of the replenishing roller 212 is treated to present a smooth "mirror surface".

[0035] As shown in Figure 2, in some embodiments, the group of replenishing rollers in each stage of the impregnation and penetration unit 21 are driven synchronously. The replenishing roller 212 in each group of replenishing rollers extends outside the impregnation tank 211 and is connected to the driving member 24 via the timing belt 23, and the replenishing roller 212 is synchronously driven to rotate by the driving member.

[0036] In this embodiment, the liquid replenishing rollers 212 in each liquid replenishing roller group extend outside the impregnation tank 211 and are connected to the driving member 24 via the timing belt 23. In this way, when the driving member 24 is activated, all the liquid replenishing rollers 212 are synchronously rotated by the timing belt 23, ensuring the stability and consistency in the impregnation and penetration process of the aluminum foil, improving the production efficiency, and enabling the aluminum foil to maintain uniform tension and speed during the immersion and transportation processes, thereby ensuring the product quality of the electrode tab.

[0037] The driving member 24 uses a servo motor or a stepping motor to ensure the rotation speed of the liquid replenishing roller 212 and provide the required torque.

[0038] As shown in FIG. 1, in some embodiments, each stage of the impregnation and penetration unit 21 further includes an adjustment roller group 213 provided above the impregnation tank 211 for adjusting the film thickness of the conductive polymer solution on the surface of the aluminum foil.

[0039] In this embodiment, the adjustment roller group 213 is provided above the impregnation tank 211. Thereby, immediately after the aluminum foil leaves the impregnation tank 211, the film thickness can be adjusted by the adjustment roller group 213, ensuring the continuous process flow of the aluminum foil during the impregnation and adjustment processes and improving the production efficiency. By accurately controlling the parameters of the adjustment roller group 213, a uniform and stable conductive film can be obtained, thereby improving the quality and performance of the electrode tab.

[0040] As shown in FIGS. 1 and 3, in some embodiments, the adjustment roller group 213 includes a first adjustment roller 2131 and a second adjustment roller 2132 which are provided with a vertical offset. The second adjustment roller 2132 is fixedly provided, and the first adjustment roller 2131 is movable in the horizontal direction. The aluminum foil is conveyed in an "S" shape between the first adjustment roller 2131 and the second adjustment roller 2132. The closest distance between the first adjustment roller 2131 and the second adjustment roller 2132 is not less than the thickness of the aluminum foil.

[0041] In this embodiment, the second adjusting roller 2132 is fixedly provided to provide a stable support surface for the aluminum foil, and in cooperation with the first adjusting roller 2131, jointly complete the adjustment of the film forming thickness of the conductive polymer solution on the aluminum foil. The first adjusting roller 2131 is movable in the lateral direction, whereby its position can be adjusted as required, changing the gap between it and the second adjusting roller 2132, and further adjusting the film forming thickness of the conductive polymer solution on the aluminum foil. Since the aluminum foil is conveyed in an "S" shape, the aluminum foil receives pressure from different directions when passing through the adjusting roller group 213, and these pressures act together to make the conductive polymer solution distribute more uniformly on the surface of the aluminum foil.

[0042] It should be noted that the closest distance between the first adjusting roller 2131 and the second adjusting roller 2132 is not less than the thickness of the aluminum foil, thereby ensuring that the aluminum foil can smoothly pass through the adjusting roller group 213 without being damaged due to too small a gap.

[0043] As shown in FIG. 1, in some embodiments, each stage of the impregnation and penetration unit 21 is respectively connected to the corresponding adjusting roller group 213, and further includes a dryer 214 for performing a drying operation on the aluminum foil that has passed through the adjusting roller group 213. Each dryer 214 is independently provided and can control its drying temperature independently.

[0044] In this embodiment, the main role of the dryer 214 is to perform a drying operation on the aluminum foil that has passed through the adjusting 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.

[0045] Each dryer 214 is respectively connected to the corresponding adjusting roller group 213. Similarly, immediately after the film forming thickness of the aluminum foil is adjusted by the adjusting roller group 213, the aluminum foil enters the dryer 214 for drying operation, ensuring that the aluminum foil can maintain a continuous process flow in the impregnation, adjustment and drying processes.

[0046] In a further design, each dryer 214 is provided independently, whereby its drying temperature can be adjusted individually, optimizing the drying process of the aluminum foil and avoiding problems with film quality due to overheating or overcooling. The flexibility and stability of the system are improved.

[0047] In a further configuration, the dryer 214 includes a plurality of dryers 214 provided in sequence in a direction away from the adjustment roller group 213, and the drying temperature provided by each dryer 214 tends to decrease in a direction away from the adjustment roller group 213.

[0048] As can be understood, the purpose of such a temperature gradient design is to optimize the drying process when the aluminum foil, immediately after being discharged from the impregnation penetration device and passing through the adjustment roller group 213, may contain more solvent or the conductive polymer film on its surface may not be fully cured. Therefore, a high temperature is required to accelerate the solvent volatilization and film curing processes. However, as the aluminum foil continues to advance, the conductive polymer film on its surface gradually stabilizes. At this time, it is necessary to lower the drying temperature to avoid problems such as a decrease in film performance due to excessive heating and deformation of the aluminum foil.

[0049] As shown in FIG. 4, in one specific configuration, each dryer 214 includes an infrared drying unit 2142, a humidity sensor 2141, a humidity control module 2140, and a movement module 2143. The infrared drying unit 2142 is provided on the movement module 2143 to approach or separate from the surface of the aluminum foil under the drive of the movement module 2143. The humidity sensor 2141 is used to detect the humidity of the surface of the passing aluminum foil and feedback the humidity data to the humidity control module 2140. Usually, when the aluminum foil enters the dryer 214, the humidity of the conductive polymer on its surface is detected. After being analyzed by the humidity control module 2140, the power of the infrared drying unit 2142 is adjusted or the movement of the movement module 2143 is controlled to adjust the relative distance between the infrared drying unit 2142 and the surface of the aluminum foil, so as to realize temperature control. When the aluminum foil is discharged from the dryer 214, a certain drying process is realized.

[0050] 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. Infrared rays have characteristics such as strong penetration power, fast heating speed, and high thermal efficiency, which can quickly improve the temperature of the surface of the aluminum foil and reduce energy consumption. The humidity sensor 2141 detects the humidity of the surface of the aluminum foil in real time, converts the humidity data into an electrical signal or other identifiable form, and feedbacks the detected humidity data to the humidity control module 2140, providing a policy basis for the control system and ensuring the accuracy and stability of the drying process. The humidity control module 2140 receives the data transmitted from the humidity sensor 2141, performs analysis and processing, and determines the humidity state of the conductive polymer film on the current surface of the aluminum foil. Based on the analysis result, by adjusting the power of the infrared drying unit 2142 or controlling the movement of the movement module 2143, the relative distance between the infrared drying unit 2142 and the surface of the aluminum foil is adjusted to control the drying speed and dryness of the aluminum foil.

[0051] As can be understood, the humidity sensor 2141 in this embodiment adopts a non-contact measurement principle, thereby avoiding physical damage to the incompletely dried conductive polymer film on the surface of the aluminum foil, and ensuring the accuracy and real-time performance of the measurement. The humidity control module 2140 further includes a preset humidity threshold setting unit. The user can customize the humidity threshold based on the material, thickness, and required dryness of the conductive polymer film on the surface of the aluminum foil, and automatically adjust the power of the infrared drying unit 2142 or the position of the infrared drying unit 2142 based on the comparison result between the real-time humidity data and the preset threshold.

[0052] It should be noted that the infrared drying unit 2142 adopts multi-band infrared radiation technology. The humidity control module 2140 can intelligently select and heat the optimal infrared band according to the humidity change on the surface of the aluminum foil, improving the drying efficiency and uniformity.

[0053] In some embodiments, the movement module 2143 includes an accurate transmission mechanism and a position feedback sensor, which can ensure the accuracy and stability of the movement of the infrared drying unit 2142. The position feedback sensor feeds back real-time position information to the humidity control module 2140 to achieve closed-loop control.

[0054] In this embodiment, the design of the transmission mechanism usually uses high-precision and low-friction materials and assemblies to reduce vibration and deviation during movement and ensure the stable operation of the infrared drying unit 2142. The materials may be selected from materials with high hardness, wear resistance, and low thermal expansion adsorption to ensure that the transmission parts are not easily worn during the long-term movement process, maintain a high-precision gear ratio and transmission efficiency, and reduce the size change due to temperature changes to ensure the stability and accuracy of the transmission mechanism. Some components may employ rolling friction assemblies such as rolling bearings and ball screws to reduce frictional resistance and vibration. Additionally, lubricants or self-lubricating materials, such as polytetrafluoroethylene, are used between the transmission members to reduce frictional adsorption and wear and vibration.

[0055] In some embodiments, the humidity control module 2140 further includes a fault alert module that monitors the operating states of the humidity sensor 2141, the infrared drying unit 2142, and the movement module 2143 in real time, emits an alert signal as soon as an abnormality is detected, and can activate an alternative to ensure the continuous operation of the production line. In a further configuration, the temperature control system further includes a remote monitoring interface that enables an operator to remotely monitor the drying process, adjust parameters, and view historical data and alarm information through a terminal device such as a computer or mobile phone from a location away from the production line.

[0056] In a further configuration, since there are conductive polymer layers on both sides of the aluminum foil, two sets of infrared drying units 2142 may be provided respectively to ensure the synchronization of the drying processes of the conductive polymer films on both sides of the aluminum foil. The two sets of infrared drying units 2142 are provided opposite to the relative sides of the aluminum foil, and the corresponding movement modules 2143 are connected respectively. Furthermore, the humidity control module 2140 in each controller can control the drying processes on both sides at the same frequency or different frequencies based on the humidity of the conductive polymer film layers on both sides.

[0057] Overall, in this application, when providing a plurality of dryers 214 sequentially, that is, providing a plurality of drying portions along the aluminum foil transport direction. Exemplarily, it includes a first drying portion, a second drying portion, and a third drying portion provided in sequence after being close to and then separated from the adjustment roller group 213. The first drying portion is used to provide a first drying temperature, the second drying portion is used to provide a second drying temperature, the third drying portion is used to provide a third drying temperature, the third drying temperature does not exceed the second drying temperature, and the second drying temperature does not exceed the first drying temperature. The second drying portion is located after the first drying portion and provides a low second drying temperature. At this stage, the aluminum foil is further dried while avoiding damage to the aluminum foil or the conductive polymer film due to an overly high temperature. The third drying portion is provided separated from the adjustment roller group 213 and provides the lowest third drying temperature. The purpose of this stage is to ensure the complete drying of the aluminum foil and maintain 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. Thus, adopting a stepped temperature control policy helps to avoid problems such as cracking, deformation, or performance degradation of the aluminum foil due to an overly high temperature during drying.

[0058] In some embodiments, the impregnation and penetration device 20 further includes a pretreatment unit 22 for surface treatment of the aluminum foil. After passing through the pretreatment unit 22, the aluminum foil enters the impregnation and penetration unit 21. The pretreatment unit 22 includes a pretreatment tank 221 for containing a cleaning and reforming solution and a guide roller 222 provided in the pretreatment tank 221. The aluminum foil bypasses the bottom of the guide roller 222 so as to be immersed and transported in the cleaning and reforming solution.

[0059] In this embodiment, when the aluminum foil passes through the pretreatment unit 22, it bypasses the bottom of the guide roller 222, and thereby is immersed in the cleaning and modification solution. In the solution, oil stains and impurities on the surface of the aluminum foil are removed, and at the same time, the surface of the aluminum foil is modified, and its wettability and adhesion are improved. The treated aluminum foil continues to maintain the original transport direction and enters the subsequent impregnation and penetration unit 21, so as to adsorb the conductive polymer solution more uniformly and form a conductive film with better quality.

[0060] The pretreatment solution is another cleaning and modification solution such as an aqueous liquid containing silicon alkane. In a specific configuration, the guide roller 222 in the pretreatment unit 22 may also have a configuration similar to that of the replenishing roller group so that the aluminum foil can be transported a certain distance in the cleaning and modification solution in the pretreatment tank 221, and is synchronously driven by a driving member unified with the replenishing roller group. And, in order to guide and adjust the transport direction of the aluminum foil respectively to realize the drying operation, an adjustment roller group 213 and a dryer 214 may be further provided. The adjustment roller group 213 and the dryer 214 may both use the configuration in the impregnation and penetration unit 21 described above.

[0061] Furthermore, in the manufacturing process of the capacitor, the process manufacturing process can be set based on the electrode tab manufactured in this application. For example, the innovative process manufacturing process setting of this application installs the electrode tab manufacturing - core lap nailing - electrolyte impregnation - assembly - aging test process on an integrated machine. Such an innovative process proposed based on the electrode tab produced in this application can not only ensure the product quality, but also reduce a plurality of processing steps, reduce the length of the production line, save costs, and thoroughly solve the technical defect that the impregnation of solid and liquid-solid two-phase products by the conventional process manufacturing process is insufficient. Such products are no longer restricted by the size of capacitor products, and capacitors of any size can be manufactured as required, and their electrical performance is better, the usage range is wider, and they are used in product series that require wide temperature, high specific capacitance, and long life, such as in-vehicle and military industries.

[0062] In one specific analysis, based on the electrode tab manufacturing process of this application and the conventional impregnation process, solid-liquid two-phase capacitor products with parameters of 450V 330μF were manufactured respectively, and test comparisons were made at normal temperature and low temperature for their electrical performance parameters. For the test results, refer to Table 1 and Table 2 respectively.

[0063] Table 1: Test data of solid-liquid two-phase capacitors manufactured with the electrode tabs of the present invention JPEG0007699735000002.jpg46170

[0064] Table 2: Test data of solid-liquid two-phase capacitors manufactured with the conventional impregnation process JPEG0007699735000003.jpg46170

[0065] As can be seen from Table 1 and Table 2, at 20°C, the average capacitance value of the solid-liquid two-phase capacitor manufactured using the electrode tab of the present invention was 319μF, which was approximately 97% of the rated capacitance, and the capacitance loss was only 3%. It shows that the manufacturing method of the electrode tab of the present invention can fully meet the standard requirements of the product, and at -55°C, the electrical performance of the product, such as capacitance change (△C / C), loss (tgδ), and impedance ratio (Z-55°C / Z20°C), all meet the standard requirements of the product. At 20°C, the average capacitance value of the solid-liquid two-phase capacitor manufactured using the conventional impregnation process was 262.2μF, which was approximately 79% of the rated capacitance, and the capacitance loss reached 21%. It shows that the conventional impregnation technology cannot meet the standard requirements of the product, and at -55°C, the electrical performance of the product, such as capacitance change (△C / C), loss (tgδ), and impedance ratio (Z-55°C / Z20°C), cannot all meet the standard requirements of the product.

[0066] What has been described above is only a part or preferred embodiments of this application, and neither the text nor the drawings can limit the protection scope of this application. Under the concept integrated with this application, equivalent structural conversions using the content of the specification and drawings of this application, or being directly / indirectly applied to other related technical fields, are included within the protection scope of this application.

Claims

1. An electrode tab manufacturing apparatus, comprising: a feeding device, an impregnation and penetration device, and a cutting and winding device provided in sequence along the transport direction of an aluminum foil. The feeding device is used for feeding the aluminum foil. The impregnation and penetration device is used for forming a conductive polymer film on the surface of the fed aluminum foil. The cutting and winding device then cuts and winds the aluminum foil into electrode tabs of a predetermined size. The impregnation and penetration device includes multiple stages of impregnation and penetration units. Each stage of the impregnation and penetration unit includes an impregnation tank for containing a conductive polymer solution and a replenishing roller group provided in the impregnation tank. The replenishing roller group includes two horizontally provided replenishing rollers. The aluminum foil bypasses the bottoms of the two replenishing rollers so as to be immersed in and transported by the conductive polymer solution. The liquid level height of the conductive polymer solution does not exceed the central axis of the replenishing roller, and the rotation direction of the replenishing roller is opposite to the driving direction caused by the action of the aluminum foil on the replenishing roller. An electrode tab manufacturing apparatus characterized by this.

2. The replenishing roller has a diameter that does not exceed the depth of the impregnation tank and is not less than two-thirds of the depth of the impregnation tank, and the installation position of the replenishing roller in the impregnation tank is such that its top does not exceed the tank opening of the impregnation tank. The electrode tab manufacturing apparatus according to claim 1, characterized by this.

3. The replenishing roller groups in each stage of the impregnation and penetration unit are synchronously driven. The replenishing rollers in each replenishing roller group extend outside the impregnation tank and are connected to a driving member via a timing belt, and the replenishing rollers are synchronously driven to rotate via the driving member. The electrode tab manufacturing apparatus according to claim 2, characterized by this.

4. Each stage of the impregnation and penetration unit further includes an adjustment roller group provided above the impregnation tank for adjusting the film formation thickness of the conductive polymer solution on the surface of the aluminum foil. The electrode tab manufacturing apparatus according to claim 1, characterized by this.

5. The adjustment roller group includes a first adjustment roller and a second adjustment roller provided with a vertical offset. The second adjustment roller is fixedly provided, and the first adjustment roller is movable in the horizontal direction. The aluminum foil is transported in an "S" shape between the first adjustment roller and the second adjustment roller. The closest distance between the first adjusting roller and the second adjusting roller is not less than the thickness of the aluminum foil, the electrode tab manufacturing apparatus according to claim 4, characterized in that.

6. Each of the impregnation penetration units of each stage Further includes a dryer for performing a drying operation on the aluminum foil that has passed through the adjustment roller group, which is respectively connected to the corresponding adjustment roller group, Each of the dryers is provided independently and can adjust its drying temperature alone, the electrode tab manufacturing apparatus according to claim 4, characterized in that.

7. The dryer includes a plurality of dryers provided in order in a direction away from the adjustment roller group, and the drying temperature provided by each dryer tends to decrease in a direction away from the adjustment roller group, the electrode tab manufacturing apparatus according to claim 6, characterized in that.

8. The impregnation penetration device further includes a pretreatment unit for surface treatment of the aluminum foil, and after passing through the pretreatment unit, the aluminum foil enters the impregnation penetration unit, The pretreatment unit Includes a pretreatment tank for containing a cleaning and reforming solution and a guide roller provided in the pretreatment tank, and the aluminum foil is routed through the bottom of the guide roller for immersion and conveyance in the cleaning and reforming solution, the electrode tab manufacturing apparatus according to claim 1, characterized in that.

9. A plurality of threading rollers are provided in the feeding device, the impregnation penetration device and the cutting and winding device, and the plurality of threading rollers are used to guide the conveying direction of the aluminum foil and perform transportation between the feeding device and the cutting and winding device, the electrode tab manufacturing apparatus according to claim 1, characterized in that.

10. The cutting and winding device controls the feeding speed of the feeding device, and the feeding device includes a magnetic powder brake, and the magnetic powder brake controls the tension stability during the transportation of the aluminum foil, the electrode tab manufacturing apparatus according to claim 1, characterized in that.

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