Preparation device of composite pole piece and control method thereof

Abstract

The invention relates to a preparation device of a composite pole piece and a control method thereof. The device comprises an unwinding unit, a rolling unit and a winding unit, the unwinding unit comprises an electrode unwinding unit and an electrolyte membrane unwinding unit; the rolling unit comprises a roller assembly, and the roller assembly is used for rolling the electrode and the electrolyte membrane which are heated by the preheating assembly to form a composite pole piece; the winding unit is used for winding the composite pole piece output by the roller mechanism and the base membrane of the electrolyte membrane; the device further comprises an electrolyte membrane adjusting mechanism arranged on the input side of the roller assembly, and an electrolyte membrane is introduced into the roller assembly through the electrolyte membrane adjusting mechanism. According to the scheme, cooperative control over the unwinding unit, the rolling unit and the winding unit can be achieved, continuous production of the composite pole piece is achieved, the whole machine structure is simplified, and the equipment complexity and the maintenance cost are reduced.

Description

Technical Field

[0001] The present application relates to the field of new energy technology, and in particular to a composite electrode preparation device and a control method thereof. Background Art

[0002] Solid-state batteries use solid electrolytes instead of liquid systems. They have the advantages of high inherent safety, high energy density potential, adaptability to a wide temperature range, and long cycle life. They are regarded as the core direction of the next generation of battery technology.

[0003] In related technologies, solid-state battery manufacturing equipment generally adopts a multi-module independent control architecture to achieve the transfer and composite of electrolyte film and electrodes, resulting in a complex structure and high cost of the whole machine; in addition, solid-state battery manufacturing equipment of related technologies is difficult to achieve high-precision transfer of electrolyte film and electrodes and precise coordinated control of process parameters, resulting in low environmental stability in continuous production. Summary of the Invention

[0004] In order to solve or partially solve the problems existing in the related art, the present application provides a preparation device for composite electrodes and a control method thereof, which can not only realize the coordinated control of the unwinding unit, the rolling unit and the winding unit to realize the continuous production of composite electrodes, but also simplify the overall machine structure and reduce the equipment complexity and maintenance costs.

[0005] In a first aspect, the present application provides a composite electrode preparation device, comprising: Unwinding unit, rolling unit and winding unit; The unwinding unit includes an electrode unwinding unit and an electrolyte membrane unwinding unit, and the electrode unwinding unit and the electrolyte membrane unwinding unit are respectively used to unwind the coils of the electrode and the electrolyte membrane and transmit them to the rolling unit at a set rate; The rolling unit includes a roller assembly, which is used to roll the electrode and electrolyte membrane after the heating treatment to form a composite electrode sheet; The winding unit is used to wind up the composite electrode sheet and the base film of the electrolyte membrane output by the roller mechanism; Among them, it also includes an electrolyte membrane regulating mechanism arranged on the input side of the roller assembly, and the electrolyte membrane is introduced into the roller assembly through the electrolyte membrane regulating mechanism; the roller assembly is provided with a heating structure, and the electrolyte membrane regulating mechanism is used to adjust the wrapping angle of the electrolyte membrane on the roller assembly to control the preheating temperature of the electrolyte membrane.

[0006] In one implementation, an electrolyte membrane transmission path and an electrode transmission path are provided in parallel between the unwinding unit and the rolling unit. The electrode transmission path is provided with a preheating mechanism for heating the electrode. The electrode passes through the preheating mechanism and is then introduced into the roller assembly. Among them, in the electrode transmission path, a first roller is provided on the input side of the roller assembly, and a second roller is provided on the output side. After passing through the preheating mechanism, the electrode is introduced into the roller assembly by the first roller, and the composite electrode sheet rolled by the roller assembly is led out through the second roller.

[0007] In one implementation, the electrolyte membrane adjustment mechanism includes an input adjustment roller, the moving direction of the input adjustment roller is along the arrangement direction of the two rollers of the roller assembly, the electrolyte membrane is introduced into the roller assembly along a first angle through the input adjustment roller, and the input adjustment roller is used to adjust the first angle when moving so that the electrolyte membrane and the roller surface have a contact area corresponding to the target preheating temperature.

[0008] In one implementation, it also includes a base membrane adjustment mechanism provided on the output side of the roller assembly. The electrolyte membrane and the electrode form a composite electrode after passing through the roller assembly. The electrolyte layer of the electrolyte membrane is transferred onto the electrode, and the base membrane of the electrolyte membrane is separated from the composite electrode after being guided by the base membrane adjustment mechanism.

[0009] In one implementation, the base film adjustment mechanism includes an output adjustment roller, the moving direction of the output adjustment roller is along the arrangement direction of the two rollers of the roller assembly, the base film is separated from the composite pole piece along the second angle after passing through the output adjustment roller, and the output adjustment roller is used to adjust the second angle when moving.

[0010] In one implementation, a cooling module is provided downstream of the rolling unit and is used to cool the composite electrode outputted from the rolling unit to a set temperature; A visual inspection module, the visual inspection module is electrically connected to the marking module, the visual inspection module is used to detect defects on the composite electrode; the marking module marks the category of the composite electrode based on the defect detection result of the visual inspection module; A thickness detection module is linked to the rolling unit, and the thickness detection module is used to detect the thickness information of the composite electrode after the film is torn off. The rolling unit adjusts the roller gap parameters of the roller unit based on the thickness information.

[0011] In one implementation, it also includes a whole machine shield and an environmental control system; The whole machine shield surrounds the unwinding unit, the rolling unit and the winding unit. A sulfide concentration detection module and a dew point detection module are provided in the whole machine shield, which are used to monitor the sulfide concentration inside and outside the shield and the environmental dew point in real time respectively; The top of the whole machine shield is equipped with an FFU air inlet unit, which inputs dry air into the whole machine shield. The bottom of the whole machine shield is connected to an air return mechanism, which extracts the exhaust gas in the shield through a fan. Among them, the environmental control system controls the air supply volume of the FFU air inlet unit and the exhaust rate of the return air mechanism in a linked manner according to the feedback data of the sulfide concentration detection module and the dew point detection module, so as to maintain the sulfide concentration in the whole machine shield below the safety threshold.

[0012] A second aspect of the present application provides a control method for the preparation device as described in the first aspect, comprising: Controlling the electrode unwinding unit and the electrolyte membrane unwinding unit to unwind synchronously, so that the electrode and the electrolyte membrane are respectively transported to the rolling unit along the electrode transmission path and the electrolyte membrane transmission path; The electrolyte membrane adjustment mechanism is used to adjust the wrapping angle of the electrolyte membrane entering the roller assembly to control the contact area between the electrolyte membrane and the heated roller, thereby achieving preheating temperature adjustment of the electrolyte membrane; Controlling the roller assembly to roll-combine the preheated electrode and electrolyte membrane to form a composite electrode sheet; The separation angle between the base film and the composite electrode is adjusted by the base film adjustment mechanism, so that the base film and the composite electrode are separated and then independently rolled up by the winding unit.

[0013] In one implementation, the electrolyte membrane adjustment mechanism adjusts the wrapping angle of the electrolyte membrane entering the roller assembly to control the contact area between the electrolyte membrane and the heated roller, thereby achieving preheating temperature adjustment of the electrolyte membrane, including: According to the difference between the target preheating temperature and the real-time detected electrolyte membrane temperature, the position of the input adjustment roller of the electrolyte membrane adjustment mechanism is dynamically adjusted to change the angle of the electrolyte membrane coating roller, control the contact area between the electrolyte membrane and the heating roller, and realize the preheating temperature adjustment of the electrolyte membrane.

[0014] In one implementation, adjusting the separation angle between the base film and the composite electrode by the base film adjustment mechanism includes: Based on the real-time detection value of the base film peeling tension, the output adjustment roller position of the base film adjustment mechanism is adjusted to change the separation angle between the base film and the composite electrode to maintain the peeling tension within the set range.

[0015] The technical solution provided by this application may include the following beneficial results: This application's solution achieves integrated control of precise preheating of the electrolyte membrane in the roller assembly and base membrane stripping by establishing a coordinated adjustment mechanism between input and output adjustment rollers. The input adjustment roller dynamically adjusts the angle at which the electrolyte membrane enters the roller, directly controlling the preheating temperature by varying the contact area of the roller heating structure. This eliminates the need for a traditional independent electrolyte membrane preheating module and simplifies the equipment layout.

[0016] In the solution of the present application, the three groups of first tension detection mechanisms can not only compensate for the difference in elongation between the metal electrode and the polymer film through graded tension detection and control, but also avoid path deviation caused by difference in material stiffness during the unwinding stage. The tension gradient difference between the electrode and the base film enables the two to deform synchronously during the preheating process, avoiding wrinkles in the composite electrode or breakage of the base film after rolling due to uneven tension.

[0017] The solution of this application avoids the accumulation of toxic gases and ensures the safety of operators through real-time sulfide concentration monitoring and rapid exhaust gas discharge. The FFU dry air input and dew point closed-loop control prevents condensation inside the shield and ensures that the electrode composite process is not affected by humidity. The return air mechanism is linked with the central pipeline to achieve unified purification of harmful gases while reducing energy consumption.

[0018] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and other objects, features and advantages of the present application will become more apparent by describing in more detail exemplary embodiments of the present application in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments of the present application.

[0020] Figure 1 Schematic diagram of the overall structure of a composite electrode preparation device shown in an embodiment of the present application; Figure 2 Schematic diagram of the coordination of the unwinding unit and the rolling unit of the composite electrode preparation device shown in the embodiment of the present application; Figure 3 It is a flow chart of a control method for a composite electrode preparation device shown in an embodiment of the present application.

[0021] Reference numerals: 101, electrolyte membrane; 102, electrode; 103, composite electrode; 104, base film; 110, unwinding unit; 111a, electrolyte membrane unwinding roller; 112b, electrode unwinding roller; 112, first deviation-correcting mechanism; 113, first tape-joining platform; 114, first cleaning mechanism; 115, first tension detection mechanism; 116, preheating roller; 120. Rolling unit; 121. Roller; 122. Input adjustment roller; 123. Output adjustment roller; 124. First passing roller; 125. Second passing roller; 126. Dust suction assembly; 130. Winding unit; 131. Second tension detection mechanism; 132. Second deviation correction mechanism; 133. Base film winding roller; 134. Cooling mechanism; 135. Visual inspection module; 140. Thickness detection module; 150. Pole piece winding mechanism; 151. Marking module; 152. Second cleaning mechanism; 153. Third tension detection mechanism; 154. Second tape connection platform; 155. Third deviation correction mechanism; 156. Pole piece winding roller. DETAILED DESCRIPTION

[0022] The following describes embodiments of the present application in more detail with reference to the accompanying drawings. Although the accompanying drawings illustrate embodiments of the present application, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments described herein. Rather, these embodiments are provided to make the present application more thorough and complete, and to fully convey the scope of the present application to those skilled in the art.

[0023] The terms used in this application are for the purpose of describing specific embodiments only and are not intended to limit this application. As used in this application and the appended claims, the singular forms "a," "an," "the," and "the" are intended to include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the term "and / or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

[0024] It should be understood that although the terms "first", "second", "third", etc. may be used in this application to describe various information, this information should not be limited to these terms. These terms are only used to distinguish information of the same type from each other. For example, without departing from the scope of this application, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0025] In the related art, solid-state battery manufacturing equipment generally adopts a multi-module independent control architecture to achieve the transfer and composite of the electrolyte film and the electrode, resulting in a complex overall structure and high cost. In addition, the solid-state battery manufacturing equipment of the related art has difficulty in achieving high-precision transfer of the electrolyte film and the electrode and precise coordinated control of process parameters, resulting in low environmental stability in continuous production. In response to the above problems, the embodiments of the present application provide a composite electrode preparation device and a control method thereof, which not only can achieve coordinated control of the unwinding unit, the rolling unit, and the winding unit to achieve continuous production of composite electrode sheets, but also simplifies the overall structure and reduces equipment complexity and maintenance costs.

[0026] The technical solutions of the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0027] Figure 1 Schematic diagram of the overall structure of a composite electrode preparation device shown in an embodiment of the present application; See also Figure 1 The present application provides a composite electrode preparation device, including an unwinding unit 110, a rolling unit 120 and a winding unit 130; the unwinding unit 110 includes an electrode unwinding unit 110 and an electrolyte membrane unwinding unit 110, the electrode unwinding unit 110 and the electrolyte membrane unwinding unit 110 are respectively used to unwind the coils of the electrode 102 and the electrolyte membrane 101 and transfer them to the rolling unit 120 at a set rate; the rolling unit 120 includes a roller assembly 121, the roller assembly 121 is used to heat the heated The electrode and the electrolyte membrane are rolled to form a composite electrode sheet; the winding unit 130 is used to wind the composite electrode sheet output by the roller assembly 121 and the base membrane 104 of the electrolyte membrane; wherein, it also includes an electrolyte membrane regulating mechanism arranged on the input side of the roller assembly 121, and the electrolyte membrane is introduced into the roller assembly 121 through the electrolyte membrane regulating mechanism; the roller assembly 121 is provided with a heating structure, and the electrolyte membrane preheating temperature is controlled by adjusting the coating angle of the electrolyte membrane on the roller assembly 121 through the electrolyte membrane regulating mechanism.

[0028] The electrode of the present application can be a current collector, such as copper foil or aluminum foil, and the solid electrolyte is transferred to the surface of the current collector by a preparation device. In other embodiments, the electrode can also be a pole piece with an active material layer coated on the surface of the current collector, and the solid electrolyte is transferred to the surface of the active material layer of the pole piece by a preparation device. The electrolyte membrane includes a base film and a solid electrolyte attached to the base film, with the side with the solid electrolyte facing the current collector. After rolling by the rolling unit 120, the electrolyte membrane is combined with the current collector, and the base film is torn off to form a composite pole piece.

[0029] In some embodiments, an electrolyte membrane transmission path and an electrode transmission path are provided between the unwinding unit 110 and the rolling unit 120, which are parallel in the longitudinal direction. Specifically, an upper transmission path, a middle transmission path and a lower transmission path are provided between the unwinding unit 110 and the rolling unit 120. The electrode unwinding unit 110 and the electrode preheating unit are located in the middle transmission path, and the electrolyte membrane unwinding unit 110 and the electrolyte membrane preheating unit are each provided with two groups, which are located in the upper transmission path and the lower transmission path, respectively. The electrolyte membrane of the upper transmission path has a solid electrolyte side facing the upper surface of the current collector, and the electrolyte membrane of the lower transmission path has a solid electrolyte side facing the lower surface of the current collector. After rolling by the rolling unit 120, the upper and lower surfaces of the current collector form a dense composite interface with the corresponding solid electrolyte.

[0030] The preparation device of the present application releases the electrode and double-layer electrolyte membrane coils respectively through the electrode unwinding unit 110 and the electrolyte membrane unwinding unit 110, and maintains stable transmission through tension closed-loop control during the unwinding process. The device introduces the electrolyte membrane into the heated roller assembly 121 at a specific wrapping angle through the electrolyte membrane adjustment mechanism, and uses the heating structure on the surface of the roller 121 to contact preheat the electrolyte membrane. The electrolyte membrane adjustment mechanism can dynamically adjust the wrapping angle according to the target preheating temperature, thereby changing the contact area between the electrolyte membrane and the roller 121 to achieve precise temperature control. The electrode and the preheated electrolyte membrane are compounded under the pressure of the roller 121, and the base film 104 is then separated and recovered by the winding unit 130. The dynamic control of the electrolyte membrane preheating temperature is achieved by adjusting the wrapping angle to avoid composite defects caused by overheating or insufficient preheating. The integrated design of the heated roller 121 simplifies the equipment structure while ensuring the temperature stability of the composite process.

[0031] Figure 2 Schematic diagram of the coordination of the unwinding unit and the rolling unit of the composite electrode preparation device shown in the embodiment of the present application.

[0032] See also Figure 2 The composite electrode preparation device of the present application includes a first deviation correction mechanism 112. The first deviation correction mechanism 112 is respectively provided with three groups, corresponding to the electrode and the electrolyte membrane on both sides, and is used to correct the deviation of the electrode and electrolyte membrane released by the electrode unwinding unit 110 and the electrolyte membrane unwinding unit 110, and perform the first centering adjustment of the current collector and the electrolyte membrane during the unwinding stage to eliminate the lateral offset of the material during the initial unwinding.

[0033] This embodiment also includes three sets of first tension detection mechanisms 115, each detecting tension on the electrode and the electrolyte membrane on both sides. These mechanisms, in conjunction with the speed regulation of the electrolyte membrane unwinding roller 111a and the electrode unwinding roller 112b, achieve synchronized tension control of the electrolyte membrane and electrode strips. The first tension detection mechanisms 115 are located downstream of the unwinding rollers of the unwinding unit 110 and are used to detect tension during the transport of the electrode and electrolyte membrane. The tension control parameters for the electrode and electrolyte membrane are different. The three sets of first tension detection mechanisms 115, in conjunction with the electrolyte membrane unwinding rollers 111a and 112b, provide graded control of the high tension on the electrode and the low tension on the base membrane. This not only compensates for the difference in elongation between the metal electrode and the polymer membrane, but also prevents path deviation caused by material stiffness differences during the unwinding phase. The differential tension gradient between the electrode and base membrane ensures synchronized deformation during the preheating process, preventing wrinkles in the rolled composite electrode sheet or base membrane fractures due to uneven tension.

[0034] In some embodiments, the unwinding unit also includes a first cleaning mechanism 114 and a second cleaning mechanism 152. The first cleaning mechanism is arranged on the unwinding unit 110, and the second cleaning mechanism 152 is arranged on the winding unit 130. The first cleaning mechanism 114 and the second cleaning mechanism 152 may include a brush assembly, an air knife, an ultrasonic dust collector and an iron removal assembly, which is not limited in this application.

[0035] When the first cleaning mechanism 114 and the second cleaning mechanism 152 are brush assemblies, the brush assembly of the first cleaning mechanism 114 is used to contact the surface of the electrode and the electrolyte membrane to remove impurities attached to the surface of the electrode and the electrolyte membrane; the brush assembly of the second cleaning mechanism 152 is used to contact the surface of the composite electrode after the film is removed to remove impurities attached to the surface of the composite electrode, thereby improving the accuracy of subsequent defect detection. It is worth noting that when the first cleaning mechanism 114 and the second cleaning mechanism 154 are air knives or ultrasonic dust collectors, corresponding methods can be used to remove impurities attached to the surface of the composite electrode.

[0036] In the present application, a preheating mechanism for heating the electrode is provided in the electrode transmission path, and the electrode strip is introduced into the roller assembly 121 after passing through the preheating mechanism. The electrode transmission path is arranged in parallel with the electrolyte membrane transmission path, and an independent preheating mechanism (such as oil heating, infrared heating or hot air circulation module) is provided in the electrode transmission path. The preheating mechanism of the embodiment of the present application is an oil-heated preheating roller. The electrode material is uniformly heated to a softened state by the preheating roller before entering the roller assembly 121, forming a synergistic effect with the preheating temperature of the electrolyte membrane. The electrolyte membrane and the electrode enter the roller assembly 121 respectively through independent transmission paths, and the electrode and the electrolyte membrane are synchronously rolled and composited. After the electrode is preheated, its flexibility increases, and the composite interface with the electrolyte membrane is closer, reducing the risk of cracking during the rolling process.

[0037] Specifically, the preheating mechanism of the electrode transmission path includes two preheating rollers 116, arranged in an S-shaped configuration with vertical and / or horizontal offsets. In this embodiment, this configuration is offset horizontally, reducing the overall longitudinal dimensions of the device. The electrode strip passes between the two preheating rollers 116 in an S-shaped winding path, forming bilateral contact with the roller surfaces of the preheating rollers 116. The strip maintains a predetermined contact arc length or angle with the two rollers. The effective heating area is equal to the product of the contact arc length (or angle) and the strip width, ensuring that the strip remains within the S-shaped winding path for a predetermined period of time, thereby ensuring sufficient heat transfer from both sides of the strip.

[0038] The preheating mechanism also includes a temperature detection component and a temperature control unit. The temperature detection component is used to detect the temperature information of the electrode; the temperature control unit is electrically connected to the temperature detection component, and is used to receive the temperature information detected by the temperature detection component, and adjust the temperature of the preheating roller to a set value based on the temperature information. When the temperature deviation of the preheating roller is greater than the set threshold, the heating mechanism is triggered to collaboratively compensate the temperature of the preheating roller until it reaches the set range.

[0039] Continue to see Figure 2 In some embodiments, the electrolyte membrane adjustment mechanism includes an input adjustment roller 122, which is movably arranged, and its moving direction is along the arrangement direction of the two rollers 121 of the roller assembly 121, for example, moving in the vertical direction. When the input adjustment roller 122 moves, the angle of the electrolyte membrane relative to the horizontal direction can be adjusted so that the electrolyte membrane and the surface of the roller 121 have a contact area corresponding to the target preheating temperature or a preset contact angle.

[0040] After passing through input adjustment roller 122, the electrolyte membrane is introduced into roller assembly 121 at a first angle. By changing the initial contact position of the electrolyte membrane upon entering roller 121, the wrapping angle between the electrolyte membrane and heated roller 121 is adjusted. For example, moving the adjustment roller upward increases the wrapping angle, prolonging the contact time between the electrolyte membrane and roller 121, thereby increasing the preheating temperature. Moving the adjustment roller downward decreases the wrapping angle, shortening the contact time between the electrolyte membrane and roller 121, thereby reducing the preheating temperature. Dynamic angle adjustment enables instant response to the electrolyte membrane preheating temperature, adapting to the process requirements of different membrane thicknesses or materials, avoiding local overheating, ensuring uniform preheating of the electrolyte membrane, and reducing membrane deformation caused by thermal stress.

[0041] In some embodiments, the rolling unit 120 includes a roller assembly 121, which includes two rollers opposed to each other in the longitudinal direction. The side between the two rollers close to the preheating mechanism is a pole piece rolling inlet. The pre-bonded electrode and electrolyte membrane can be transferred laterally to between the two rollers through the rolling inlet, so that the two rollers apply pressure to the pole piece on the upper and lower sides.

[0042] Among them, a liquid circulation channel is provided in the rolling roller, which is used to transfer the heat of the heat-conducting liquid to the rolling surface. This not only allows the rolling roller to apply pressure to the electrode at a set temperature, but also preheats the electrolyte membrane by forming a set wrapping angle with the electrolyte membrane during the rolling process, avoiding the defect of setting a separate electrolyte membrane preheating mechanism in front of the rolling unit 120, which leads to a complex structure of the entire machine.

[0043] In some embodiments, the rolling unit 120 further includes a roll gap adjustment mechanism, which may be an AGC hydraulic servo roll gap adjustment system or a skew iron mechanism. The AGC hydraulic servo roll gap adjustment system is used for continuous pole pieces, while the skew iron roll gap adjustment mechanism is used for discontinuous pole pieces. The AGC hydraulic servo roll gap adjustment system utilizes closed-loop control of a displacement sensor and a servo valve to switch between constant pressure and constant gap modes during rolling of continuous pole pieces, dynamically compensating for fluctuations in pole piece thickness.

[0044] In some embodiments, the preparation apparatus further includes an output adjustment roller 123 located on the output side of the roller assembly 121. After the electrolyte membrane and electrode pass through the roller assembly 121, a composite electrode sheet is formed. The electrolyte layer of the electrolyte membrane is transferred onto the electrode. The base film 104 of the electrolyte membrane is separated from the composite electrode sheet after being guided by the output adjustment roller 123. The output adjustment roller 123 can move along the arrangement direction of the roller assembly, for example, in the vertical direction, to change the intersection of the base film 104 with respect to the horizontal direction, also known as the peeling angle (e.g., acute angle or obtuse angle), thereby reducing the impact of peeling stress on the composite electrode sheet. The separated base film 104 is recovered by the base film winding mechanism.

[0045] In the electrode transmission path, a first roller 124 is provided on the input side of the roller assembly 121, and a second roller 125 is provided on the output side. After passing through the preheating mechanism, the electrode is introduced into the roller assembly 121 by the first roller 124, and the composite electrode sheet rolled by the roller assembly 121 is led out through the second roller 125. The first roller 124 and the second roller 125 are respectively arranged on the input and output sides of the roller assembly 121 to guide the transmission path of the electrode and the composite electrode sheet. After being preheated, the electrode smoothly enters the roller assembly 121 through the first roller 124, and the composite electrode sheet is led out through the second roller 125 and enters the subsequent inspection station (such as thickness inspection). The first roller 124 and the second roller 125 ensure the stability of the transmission path of the composite electrode sheet before rolling and after film tearing, avoiding position offset and misalignment of the composite or film tearing.

[0046] In some embodiments, the winding unit 130 includes a base film winding mechanism. The base film winding mechanism is provided with two groups, each used to wind the strip-shaped base film after being torn off the two sides of the pole piece into a roll. Specifically, the base film winding mechanism may include a base film winding roller 133 for winding the base film. The base film winding roller 133 is used to wind the base film. A second tension detection mechanism 131 is installed at the entrance of the winding station. The second tension detection mechanism 131 includes a tension detector. When the real-time tension is detected to be greater than 100-150N, the winding motor is controlled to slow down and the winding is slowed down; when the real-time tension is lower than 100-150N, the winding motor is controlled to slow down and speed up, and the winding is accelerated. With such a setting, the tension fluctuation of the base film 104 can be reduced during the winding process, so that the winding main shaft is wound under constant tension, thereby reducing the phenomenon of stacking or breaking of the base film due to tension fluctuation during the winding process.

[0047] In some embodiments, a second correcting mechanism 132 is further provided, which is used to adjust the lateral displacement of the base film 104 during transmission in the winding unit, so that the base film 104 is transmitted to the base film winding roller 133 along a predetermined trajectory, thereby avoiding deviation of the base film during winding.

[0048] In some embodiments, a dust collection assembly 126 is further included downstream of the rolling unit. The dust collection assembly 126 includes a negative pressure generating mechanism and a dust collection member connected to the negative pressure generating mechanism via a pipeline. The dust collection member is placed at the base film separation point of the composite electrode 103 to absorb impurities generated after the base film is torn off. The negative pressure generating mechanism may include a variable frequency centrifugal fan. The dust collection member adopts an adjustable angle strip suction port. The width of the suction port is set to match the width of the composite electrode 103. For example, it can be equal to the width of the composite electrode 103. The suction port faces the separation point between the base film and the substrate. When the base film is torn off from the composite electrode 103, the variable frequency centrifugal fan is started, forming a high-speed negative pressure airflow at the dust collection member. The dust and debris generated by the tearing are sucked into the dust collection member and enter the cyclone separator through the pipeline to achieve gas-solid separation. Finally, the impurities enter the recovery device.

[0049] In some embodiments, a cooling mechanism 134 is further included downstream of the rolling unit. The cooling mechanism 134 is used to reduce the temperature of the composite electrode 103 after the film is torn to near room temperature. When the cooling roller of the cooling mechanism rotates, it has a set contact time with the composite electrode being transmitted. During this contact time, the surface temperature of the electrode is reduced to room temperature through the heat transfer effect, thereby meeting the temperature requirements of the subsequent visual inspection process.

[0050] In some embodiments, a visual inspection module 135, a marking module 151, and a thickness detection module 140 are further included, which are arranged downstream of the cooling mechanism 134. The visual inspection module 135 is electrically connected to the marking module 151. The visual inspection module 135 is used to detect defects on the composite electrode; the marking module 151 marks the category of the composite electrode based on the defect detection results of the visual inspection module. The visual inspection module 135 uses a high-resolution camera to identify defects such as bubbles and cracks on the surface of the composite electrode, and triggers the marking module (such as an inkjet printer) to mark the defective area. Defect marking enables defect tracing, facilitates subsequent slitting or rework, and improves the yield rate. The thickness closed-loop control ensures the thickness consistency of the composite electrode, reduces manual intervention, and improves production efficiency.

[0051] In this embodiment, the thickness detection module 140 is linked to the roll gap adjustment mechanism of the rolling unit 120. The thickness detection module 140 can use a laser thickness gauge to provide real-time feedback on the thickness of the composite electrode sheet, and the rolling unit 120 can automatically adjust the roll gap pressure. The rolling unit 120 adjusts the roll gap parameters of the roller 121 based on the thickness information detected by the thickness detection module 140, thereby meeting the production requirements of composite electrode sheets of different types or materials and improving the thickness consistency of the rolled composite electrode sheets.

[0052] In some embodiments, a first splicing platform 113 and a second splicing platform 154 are further included. The first splicing platform 113 is located behind the unwinding roller of the unwinding unit, and the second splicing platform 154 is located before the rewinding roller of the rewinding unit. The first splicing platform 113 and the second splicing platform 154 are used to perform connection operations on the two ends of the material strip. For example, the operator can accurately align the break in the splicing operation section and complete the splicing operation. When the material strip of the electrode, electrolyte membrane, base membrane or composite electrode is broken during the rewinding process due to abnormal tension, material defects or other reasons, the operator can quickly reconnect the broken part through the splicing platform to avoid shutdown or waste accumulation, and ensure the continuity and stability of the electrode and electrolyte membrane unwinding, base membrane recovery and composite electrode rewinding processes.

[0053] In this embodiment, the electrode winding mechanism 150 includes a electrode winding roller 156, which is used to wind the composite electrode after defect detection processing, so that the composite electrode is wound into a roll, which is convenient for subsequent transportation or storage. The third correction mechanism and the third tension detection mechanism 153 are provided in the electrode winding mechanism. The third correction mechanism 155 is used to adjust the centering of the composite electrode before winding to eliminate the lateral deviation of the composite electrode before winding. The third tension detection mechanism 153 is used to detect the transmission tension of the composite electrode before winding, and then cooperate with the speed adjustment of the winding roller to control the tension of the composite electrode before winding to a set value, eliminating the electrode jitter or local wrinkles caused by sudden tension changes, so that the visual inspection module can capture smaller defects, thereby improving the detection accuracy. In this embodiment, the tension control range of the composite electrode before winding is 100-150N. When it exceeds this tension, the winding is slowed down; when it is less than this tension, the winding is accelerated. This reduces tension fluctuations during roll change and enables dynamic winding during continuous production of composite electrodes.

[0054] In some embodiments, a whole-machine protective cover and an environmental control system are further included; the whole-machine protective cover surrounds the unwinding unit 110, the rolling unit 120 and the winding unit 130, and a sulfide concentration detection module and a dew point detection module are provided in the protective cover, which are respectively used to monitor the sulfide concentration and the environmental dew point inside and outside the protective cover in real time; an FFU air inlet unit is configured on the top of the protective cover, and the FFU (Fan Filter Unit) air inlet unit inputs dry air with a dew point not higher than -50°C into the protective cover; the bottom of the protective cover is connected to a return air mechanism, and the return air mechanism exhausts the exhaust gas in the protective cover to the central exhaust gas treatment pipeline of the factory building through a fan; the environmental control system controls the air supply volume of the FFU air inlet unit and the exhaust rate of the return air mechanism in conjunction with the feedback data of the sulfide concentration detection module and the dew point detection module, so as to maintain the sulfide concentration in the protective cover below the safety threshold and the dew point stable below -50°C. Through real-time sulfide concentration monitoring and rapid exhaust gas discharge, the accumulation of toxic gases is avoided and the safety of operators is guaranteed. The FFU dry air input and dew point closed-loop control prevents condensation inside the shield and ensures that the electrode composite process is not affected by humidity. The return air mechanism is linked with the central pipeline to achieve unified purification of harmful gases while reducing energy consumption.

[0055] The present invention utilizes a coordinated adjustment mechanism between input adjustment rollers 122 and output adjustment rollers 123 to achieve integrated control of precise preheating of the electrolyte membrane within roller assembly 121 and the removal of the base film 104. Input adjustment rollers 122 dynamically adjust the angle at which the electrolyte membrane wraps around roller 121, directly controlling the preheating temperature by varying the contact area of roller 121's heating structure. This eliminates the need for a traditional independent electrolyte membrane preheating module and simplifies the equipment layout.

[0056] In addition, the output adjustment roller 123 adjusts the peeling angle of the base film 104 so that the separation process of the base film 104 and the composite electrode can be stably completed by simply adjusting the roller position, without the need for additional complex film tearing and separation devices. The synergistic effect of the front and rear rollers not only reduces the independent drive mechanisms of the preheating, rolling, and film tearing links in the traditional process, but also reduces the equipment complexity and manufacturing costs through mechanical structure integration. At the same time, this design avoids the coordination errors caused by the independent control of multiple modules, improves the yield of the composite electrode, and is particularly suitable for high-precision, multi-material continuous production scenarios.

[0057] The composite electrode manufacturing device of the present application is introduced above. Accordingly, the present application also provides a control method for the composite electrode manufacturing device.

[0058] Figure 3 It is a flow chart of a control method for a composite electrode preparation device shown in an embodiment of the present application.

[0059] See also Figure 1 and Figure 3 , the method comprises the following steps: S110 , controlling the electrode unwinding unit 110 and the electrolyte membrane unwinding unit 110 to unwind synchronously, so that the electrode and the electrolyte membrane are respectively transported to the rolling unit 120 along the electrode transport path and the electrolyte membrane transport path.

[0060] In this step, the electrode unwinding unit 110 and the electrolyte membrane unwinding unit 110 are controlled to release materials at a synchronous rate. After the electrode is heated to the target temperature by the preheating mechanism, it is introduced into the roller assembly 121 by the first roller 124 .

[0061] S120, adjusting the wrapping angle of the electrolyte membrane entering the roller assembly 121 through the electrolyte membrane adjustment mechanism to control the contact area between the electrolyte membrane and the heating roller 121, thereby achieving preheating temperature adjustment of the electrolyte membrane.

[0062] In this step, the coating angle of the electrolyte membrane is adjusted by controlling the operation of the input adjustment roller 122 so as to increase the contact area between the electrolyte membrane and the heating roller 121 to improve the preheating efficiency.

[0063] S130 , controlling the roller assembly 121 to roll-combine the preheated electrode and electrolyte membrane to form a composite electrode sheet.

[0064] In this step, the roller assembly 121 is controlled to perform roller pressing and laminating of the two layers of material at a constant pressure.

[0065] S140: The base film 104 adjustment mechanism adjusts the separation angle between the base film 104 and the composite electrode sheet, separating the base film 104 and the composite electrode sheet. The base film 104 and the composite electrode sheet are then independently reeled up by the reeling unit 130. In this step, the composite electrode sheet is guided out by the second roller 125, and the base film 104 is peeled off from the composite electrode sheet after the separation angle is adjusted by the output adjustment roller 123. The base film 104 is then reeled up by the independent reeling unit 130.

[0066] The solution of the present application realizes continuous composite production through the coordinated control of synchronous unwinding and separation angle, reduces the downtime of traditional multi-station switching, and the integrated design of the input / output adjustment roller 123 simplifies the preheating and film tearing structure, reducing equipment complexity and maintenance costs.

[0067] In some embodiments, the electrolyte membrane adjustment mechanism is used to adjust the wrapping angle of the electrolyte membrane entering the roller assembly 121 to control the contact area between the electrolyte membrane and the heated roller 121, thereby achieving preheating temperature adjustment of the electrolyte membrane, including: dynamically adjusting the position of the input adjustment roller 122 of the electrolyte membrane adjustment mechanism according to the difference between the target preheating temperature and the real-time detected electrolyte membrane temperature to change the angle of the electrolyte membrane wrapping roller 121, control the contact area between the electrolyte membrane and the heated roller 121, and achieve preheating temperature adjustment of the electrolyte membrane.

[0068] This application's solution measures the surface temperature of the electrolyte membrane before it enters roller 121 in real time. If the measured value is lower than the target preheat temperature, the input adjustment roller 122 is controlled to move downward to increase the angle between the membrane and roller 121, extending the contact time and enhancing the heating effect. If the temperature is too high, the adjustment roller is moved upward to reduce the contact area. During the adjustment process, the temperature sensor and the adjustment roller displacement form a closed-loop feedback loop, dynamically compensating for environmental interference, ensuring a uniform and stable preheat temperature for the electrolyte membrane, avoiding a decrease in bonding strength due to overheating or insufficient preheating, and reducing manual intervention to improve process consistency.

[0069] In some embodiments, the separation angle between the base film 104 and the composite electrode is adjusted by the base film 104 adjustment mechanism, including: adjusting the position of the output adjustment roller 123 of the base film 104 adjustment mechanism based on the real-time detection value of the peeling tension of the base film 104 to change the separation angle between the base film 104 and the composite electrode and maintain the peeling tension within a set range. During the peeling process of the base film 104, the tension sensor detects the tension value when the base film 104 is separated from the composite electrode in real time. If the tension exceeds the set upper limit, the output adjustment roller 123 is controlled to move upward to reduce the separation angle and reduce the peeling resistance; if the tension is too low, the adjustment roller is moved downward to increase the angle to avoid residual base film 104. Dynamic tension control prevents the base film 104 from breaking or damaging the composite layer, ensuring the reliability of the film tearing process; the linkage adjustment of angle and tension reduces material waste and improves the winding quality.

[0070] In some embodiments, after controlling the roller assembly 121 to roll-compound the preheated electrode and electrolyte membrane to form a composite electrode sheet, it includes: performing surface defect detection on the composite electrode sheet through a visual inspection module, and triggering a marking module to mark the defect location based on the detection result; obtaining the thickness data of the composite electrode sheet through a thickness detection module, and dynamically adjusting the roller gap parameters of the roller assembly 121 based on the thickness data.

[0071] The visual inspection module includes a CCD camera. After the composite electrode is cooled by the cooling roller, the CCD camera scans the surface along the transmission direction, identifies pinholes or wrinkle defects, and synchronously triggers the inkjet printer of the marking module to spray the color code at the defect location. At the same time, the laser thickness gauge detects the thickness of the composite layer in real time. If the thickness exceeds the tolerance, the control system automatically adjusts the cylinder pressure of roller 121 or the displacement of the inclined iron to compensate for the roller gap. Therefore, this application realizes real-time monitoring of thickness and surface quality through online detection and closed-loop control, reduces the flow of defective products into subsequent processes, and accurately locates defects with defect marking, which facilitates subsequent automated sorting or rework, thereby improving the overall yield.

[0072] In this application, input adjustment roller 122 dynamically adjusts the wrapping angle based on temperature differential feedback, directly utilizing heating from roller 121 in place of a separate preheating module. This simplifies the equipment structure while ensuring uniform electrolyte membrane temperature. Output adjustment roller 123 adaptively adjusts the separation angle through closed-loop peeling tension control, avoiding the complex drive requirements of traditional mechanical film tearing mechanisms and significantly reducing the risk of film breakage. Combining online visual inspection with closed-loop thickness adjustment, surface defects and thickness deviations in the composite electrode are corrected in real time, reducing manual inspection and rework costs. The overall solution, through the integration of mechanical streamlining and intelligent control, improves composite yield while reducing equipment manufacturing costs and energy consumption.

[0073] The embodiments of the present application have been described above. The above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is selected to best explain the principles of the embodiments, their practical applications, or improvements to the technology in the market, or to enable other persons skilled in the art to understand the embodiments disclosed herein.

Claims

1. A composite electrode preparation device, characterized in that: include: Unwinding unit, rolling unit and winding unit; The unwinding unit includes an electrode unwinding unit and an electrolyte membrane unwinding unit, and the electrode unwinding unit and the electrolyte membrane unwinding unit are respectively used to unwind the coils of the electrode and the electrolyte membrane and transmit them to the rolling unit at a set rate; The rolling unit includes a roller assembly, which is used to roll the electrode and electrolyte membrane after the heating treatment to form a composite electrode sheet; The winding unit is used to wind up the composite electrode sheet and the base film of the electrolyte membrane output by the roller mechanism; Among them, it also includes an electrolyte membrane regulating mechanism arranged on the input side of the roller assembly, and the electrolyte membrane is introduced into the roller assembly through the electrolyte membrane regulating mechanism; the roller assembly is provided with a heating structure, and the electrolyte membrane regulating mechanism is used to adjust the wrapping angle of the electrolyte membrane on the roller assembly to control the preheating temperature of the electrolyte membrane.

2. The device according to claim 1, characterized in that: An electrolyte membrane transmission path and an electrode transmission path are provided in parallel between the unwinding unit and the rolling unit. The electrode transmission path is provided with a preheating mechanism for heating the electrode. The electrode passes through the preheating mechanism and is then introduced into the roller assembly. Among them, in the electrode transmission path, a first roller is provided on the input side of the roller assembly, and a second roller is provided on the output side. After passing through the preheating mechanism, the electrode is introduced into the roller assembly by the first roller, and the composite electrode sheet rolled by the roller assembly is led out through the second roller.

3. The device according to claim 1, characterized in that: The electrolyte membrane adjustment mechanism includes an input adjustment roller, the moving direction of the input adjustment roller is along the arrangement direction of the two rollers of the roller assembly, the electrolyte membrane is introduced into the roller assembly along a first angle through the input adjustment roller, and the input adjustment roller is used to adjust the first angle when moving so that the electrolyte membrane and the roller surface have a contact area corresponding to the target preheating temperature.

4. The device according to claim 1, characterized in that: It also includes a base membrane adjustment mechanism arranged on the output side of the roller assembly. The electrolyte membrane and the electrode form a composite electrode after passing through the roller assembly. The electrolyte layer of the electrolyte membrane is transferred onto the electrode. The base membrane of the electrolyte membrane is separated from the composite electrode after being guided by the base membrane adjustment mechanism.

5. The device according to claim 4, characterized in that: The base film adjustment mechanism includes an output adjustment roller, the moving direction of the output adjustment roller is along the arrangement direction of the two rollers of the roller assembly, the base film is separated from the composite pole piece along the second angle after passing through the output adjustment roller, and the output adjustment roller is used to adjust the second angle when moving.

6. The device according to claim 1, characterized in that: A cooling module is provided downstream of the rolling unit and is used to cool the composite electrode output by the rolling unit to a set temperature; A visual inspection module, the visual inspection module is electrically connected to the marking module, the visual inspection module is used to detect defects on the composite electrode; the marking module marks the category of the composite electrode based on the defect detection result of the visual inspection module; A thickness detection module is linked to the rolling unit, and the thickness detection module is used to detect the thickness information of the composite electrode after the film is torn off. The rolling unit adjusts the roller gap parameters of the roller unit based on the thickness information.

7. The device according to claim 1, characterized in that: It also includes the whole machine shield and environmental control system; The whole machine shield surrounds the unwinding unit, the rolling unit and the winding unit. A sulfide concentration detection module and a dew point detection module are provided in the whole machine shield, which are used to monitor the sulfide concentration inside and outside the shield and the environmental dew point in real time respectively; The top of the whole machine shield is equipped with an FFU air inlet unit, which inputs dry air into the whole machine shield. The bottom of the whole machine shield is connected to an air return mechanism, which extracts the exhaust gas in the shield through a fan. Among them, the environmental control system controls the air supply volume of the FFU air inlet unit and the exhaust rate of the return air mechanism in a linked manner according to the feedback data of the sulfide concentration detection module and the dew point detection module, so as to maintain the sulfide concentration in the whole machine shield below the safety threshold.

8. A control method for a preparation device according to any one of claims 1 to 7, characterized in that: include: Controlling the electrode unwinding unit and the electrolyte membrane unwinding unit to unwind synchronously, so that the electrode and the electrolyte membrane are respectively transported to the rolling unit along the electrode transmission path and the electrolyte membrane transmission path; The electrolyte membrane adjustment mechanism is used to adjust the wrapping angle of the electrolyte membrane entering the roller assembly to control the contact area between the electrolyte membrane and the heated roller, thereby achieving preheating temperature adjustment of the electrolyte membrane; Controlling the roller assembly to roll-combine the preheated electrode and electrolyte membrane to form a composite electrode sheet; The separation angle between the base film and the composite electrode is adjusted by the base film adjustment mechanism, so that the base film and the composite electrode are separated and then independently rolled up by the winding unit.

9. The method according to claim 8, characterized in that The electrolyte membrane adjustment mechanism is used to adjust the wrapping angle of the electrolyte membrane entering the roller assembly to control the contact area between the electrolyte membrane and the heating roller, thereby achieving preheating temperature adjustment of the electrolyte membrane, including: According to the difference between the target preheating temperature and the real-time detected electrolyte membrane temperature, the position of the input adjustment roller of the electrolyte membrane adjustment mechanism is dynamically adjusted to change the angle of the electrolyte membrane coating roller, control the contact area between the electrolyte membrane and the heating roller, and realize the preheating temperature adjustment of the electrolyte membrane.

10. The method according to claim 8, characterized in that The method of adjusting the separation angle between the base film and the composite electrode piece by the base film adjustment mechanism includes: Based on the real-time detection value of the base film peeling tension, the output adjustment roller position of the base film adjustment mechanism is adjusted to change the separation angle between the base film and the composite electrode to maintain the peeling tension within the set range.

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