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 preheating unit, a rolling unit, a film tearing unit and a winding unit, the unwinding unit comprises an electrode unwinding mechanism and an electrolyte membrane unwinding mechanism; the preheating unit comprises an electrode preheating mechanism and an electrolyte membrane preheating mechanism; the electrode preheating mechanism and the electrolyte membrane preheating mechanism are respectively used for heating an electrode and an electrolyte membrane output by the unwinding device to a preset temperature and then transmitting the electrode and the electrolyte membrane to the rolling 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; the film tearing unit is used for tearing a base film on the surface of the composite pole piece output by the rolling assembly; and the winding unit is used for winding the composite pole piece output by the roller mechanism and the base film torn by the film tearing unit. According to the scheme provided by the invention, high-efficiency continuous production of the composite pole piece can be realized, and meanwhile, the product yield can be improved.

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] Compared with liquid batteries, solid-state batteries have advantages such as high energy density and good safety performance. Therefore, solid-state batteries have always been regarded as one of the development directions of future battery technology.

[0003] In the related art, in the manufacture of all-solid-state batteries, it is necessary to transfer the solid electrolyte layer to the surface of the current collector or electrode to form a stable solid-solid interface. However, the ductility of the polymer base film of the electrolyte membrane and the metal layer (such as copper and aluminum) of the electrode is significantly different. During the production process, the unwinding tension, preheating temperature, rolling pressure, film tearing and winding processes need to be linked in real time. However, the equipment of the related art has difficulty in achieving coordinated control of each device, resulting in difficulty in real-time matching the deformation requirements caused by the ductility difference of the material. As a result, the yield of the composite electrode formed after rolling is low, making it difficult to achieve continuous production of composite electrode sheets. 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 a composite electrode and a control method thereof, which can perform closed-loop control of the unwinding unit, preheating unit, rolling unit, film tearing unit and winding unit, thereby realizing efficient and continuous production of composite electrodes and improving product yield.

[0005] In a first aspect, the present application provides a composite electrode preparation device, comprising: An unwinding unit, a preheating unit, a rolling unit, a film tearing unit, and a winding unit; the unwinding unit, the preheating unit, the rolling unit, the film tearing unit, and the winding unit are arranged in sequence according to a predetermined track and are connected in series by the traveling electrode and electrolyte membrane; The unwinding unit includes an electrode unwinding mechanism and an electrolyte membrane unwinding mechanism, and the electrode unwinding mechanism and the electrolyte membrane unwinding mechanism are respectively used to unwind the coils of the electrode and the electrolyte membrane and transfer them to the preheating unit at a set rate; The preheating unit includes an electrode preheating mechanism and an electrolyte membrane preheating mechanism, which are respectively used to heat the electrode and electrolyte membrane output by the unwinding device to a preset temperature and then transmit them to the rolling unit; The rolling unit includes a roller assembly, which is used to roll the electrode and electrolyte membrane after the preheating assembly is heated to form a composite electrode sheet; The film-tearing unit is provided at the output end of the rolling assembly, and is used to tear off the base film on the surface of the composite electrode output by the rolling assembly; The winding unit is used to wind up the composite electrode output by the roller mechanism and the base film torn off by the film tearing unit.

[0006] In one embodiment, the invention further comprises: a first deviation correction mechanism, provided in the unwinding unit, for performing a first deviation correction on the electrode and electrolyte membrane released by the electrode unwinding mechanism and the electrolyte membrane unwinding mechanism, so that the electrode and electrolyte membrane enter the preheating unit in a centered state; A second correcting mechanism is provided in the preheating unit and is used for performing a second correcting on the electrode and the electrolyte membrane before or after preheating; wherein, a bonding component is provided between the preheating unit and the rolling unit, and the second correcting mechanism is used for allowing the electrode and the electrolyte membrane to enter the bonding component after the second correcting, and the bonding component is used for introducing the electrode and the electrolyte membrane into the rolling unit after pre-bonding.

[0007] In one embodiment, the rolling unit includes a roller group and a roller gap adjustment mechanism; The roller group includes two rollers that are opposed to each other in the longitudinal direction. A roller pressing inlet is provided between the two rollers on the side close to the preheating mechanism. The pre-laminated electrode and electrolyte membrane can be transferred transversely to between the two rollers through the roller pressing inlet, so that the two rollers apply pressure to the pre-laminated electrode and electrolyte membrane on the upper and lower sides. The roll gap adjustment mechanism includes an AGC hydraulic servo roll gap adjustment system or an inclined iron mechanism, wherein the AGC hydraulic servo roll gap adjustment system is used for roll gap adjustment in a continuous pole piece scenario, and the inclined iron mechanism is used for roll gap adjustment in a discontinuous pole piece scenario.

[0008] In one embodiment, the film tearing unit is provided at the output end of the rolling unit, and is used to separate the base membrane of the electrolyte membrane from the composite electrode sheet; wherein, a first cooling component is provided upstream of the film tearing unit, and the first cooling component is used to cool the composite electrode sheet formed after the rolling process of the rolling unit to a second preset temperature, so that the film tearing unit can perform the film tearing operation on the composite electrode sheet at the second preset temperature; the temperature control parameters of the first cooling component are associated with the properties of the base membrane of the electrolyte membrane.

[0009] In one embodiment, the downstream of the film tearing unit includes: A visual inspection module, the visual inspection module is electrically connected to the marking module, and the visual inspection module is used to perform defect detection on the composite electrode; a marking module, which marks the defect category of the composite electrode based on the defect detection result of the visual inspection module; A thickness detection module is provided downstream of the film tearing unit. The thickness detection module is linked to the rolling unit. The thickness detection module is used to detect the thickness information of the composite electrode after film tearing. The roll gap adjustment mechanism of the rolling unit adjusts the roll gap parameters of the rolling unit based on the thickness information.

[0010] In one embodiment, the method comprises: a first tension control mechanism, provided downstream of the unwinding roller of the unwinding unit, for controlling the tension of the electrode and the electrolyte membrane during transmission to the preheating unit, wherein the tension control parameters corresponding to the electrode and the electrolyte membrane are different; A second tension control mechanism is provided between the film tearing unit and the visual inspection module, and is used to control the tension of the composite electrode after the film is torn, so that the composite electrode enters the visual inspection module under the set tension; The third tension control mechanism is provided in the winding unit and is used to control the tension of the composite electrode before winding to a set value.

[0011] A second aspect of the present application provides a control method for the preparation device as described in the first aspect, comprising: Controlling the synchronous operation of the electrode unwinding mechanism and the electrolyte membrane unwinding mechanism so that the electrode sheet and electrolyte membrane coils to be composited are respectively transported to the preheating unit at a set rate; Controlling the preheating unit to independently heat the electrode and the electrolyte membrane to corresponding preset temperatures and then transporting them to the rolling unit; Controlling the rolling unit to synchronously roll and laminate the preheated electrode and electrolyte membrane to form a composite electrode sheet; The film-tearing unit is controlled to perform the base film separation operation on the rolled composite electrode, and the winding unit is controlled to implement the roll recovery of the finished composite electrode and the separated base film.

[0012] In one embodiment, the control electrode unwinding mechanism and the electrolyte membrane unwinding mechanism are operated synchronously, comprising: During the unwinding stage, the first dynamic correction is implemented by the first correction mechanism, so that the electrode and the electrolyte membrane are kept in the center state before entering the preheating unit; The controlling preheating unit heats the electrodes and the electrolyte membrane independently to corresponding preset temperatures and then transports them to the rolling unit, including: A second active deviation correction is performed at the outlet of the preheating unit by a second deviation correction mechanism to adjust the relative position deviation between the electrode and the electrolyte membrane to a preset threshold range; The laminating assembly is controlled to apply a pre-compression force to the electrode and the electrolyte membrane after the secondary deviation correction, and the pre-composite structure is formed and then introduced into the rolling unit.

[0013] In one embodiment, independent tension closed-loop control is established in the electrode unwinding channel and the electrolyte membrane unwinding channel through corresponding tension control mechanisms; The matching relationship between the electrode transmission tension and the electrolyte membrane transmission tension is dynamically adjusted according to the difference in material properties, and the electrode transmission tension and the electrolyte membrane transmission tension are stabilized within a preset range before the inlet of the preheating unit.

[0014] In one embodiment, the temperature of the rolled composite electrode is controlled by a first cooling assembly, and the film peeling unit performs a film peeling operation when the base film peeling interface reaches a predetermined adhesion strength; The dynamic balance between the winding tension and the film tearing traction force is synchronously adjusted by the third tension control mechanism to keep the shape of the composite electrode stable during the winding process.

[0015] The technical solution provided by this application may include the following beneficial results: The preparation device provided in the present application can efficiently transfer the solid electrolyte layer to the electrode surface to form a composite electrode through the coordination of the unwinding unit, preheating unit, rolling unit, film tearing unit and winding unit; through real-time linkage adjustment of the parameters of the unwinding unit, preheating unit and rolling unit, it can dynamically compensate for the difference in ductility between the electrode and the electrolyte membrane, and combined with the pressure adjustment of the roller assembly, it can reduce wrinkles or microcracks caused by interface stress concentration, thereby improving the yield of the composite electrode; at the same time, through closed-loop control of the unwinding unit, preheating unit, rolling unit, film tearing unit and winding unit, the synchronization of the coil transmission is achieved, thereby realizing continuous production.

[0016] The technical solution of this application realizes the efficient and stable operation of the preparation device during the production of composite electrodes through coordinated control of multiple material paths and closed-loop feedback of the entire process. The coordinated control of the unwinding unit and the preheating unit ensures the precise alignment of the multi-layer materials, and the temperature-controlled preheating significantly improves the interface bonding quality between the electrolyte membrane and the electrode.

[0017] 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

[0018] 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.

[0019] Figure 1 Schematic diagram of the overall structure of a composite electrode preparation device shown in an embodiment of the present application; Figure 2Schematic diagram of the coordination of the unwinding unit, preheating unit and rolling unit of the composite electrode preparation device shown in the embodiment of the present application; Figure 3 Schematic diagram of the cooperation between the rolling unit, pre-film tearing unit and film tearing and winding mechanism of the composite electrode preparation device shown in the embodiment of the present application; Figure 4 Schematic diagram of a pole piece winding mechanism of a composite pole piece preparation device shown in an embodiment of the present application; Figure 5 It is a flow chart of a control method for a composite electrode preparation device shown in an embodiment of the present application.

[0020] Reference numerals: 110, unwinding unit; 101, electrolyte membrane; 102, electrode; 111a, electrolyte membrane unwinding roller; 112b, electrode unwinding roller; 112, first deflection-correcting mechanism; 113, first tape-joining platform; 114, first cleaning assembly; 115, first tension control mechanism; 120, preheating unit; 121, second deflection-correcting mechanism; 122, preheating mechanism; 1221, preheating roller; 123, laminating assembly; 1231, laminating roller; 130, rolling unit; 131, roller; 140, first cooling mechanism; 141, cooling roller; 150, Film tearing unit; 151, film tearing roller assembly; 152, guide roller assembly; 153, dust suction assembly; 154, second cleaning assembly; 155, second tape splicing platform; 156, third deviation correction mechanism; 157, base film winding mechanism; 158, second tension control mechanism; 159, second cooling mechanism; 1591, visual inspection module; 160, thickness detection module; 170, pole piece winding unit; 171, marking module; 172, third tension control mechanism; 173, third tape splicing platform; 174, fourth deviation correction mechanism; 175, pole piece winding mechanism. DETAILED DESCRIPTION

[0021] 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.

[0022] 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.

[0023] 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.

[0024] The composite electrode preparation equipment in the related art has difficulty in achieving coordinated control of various devices, resulting in difficulty in real-time matching of the deformation requirements of the material due to differences in ductility, resulting in a low yield of the composite electrode formed after rolling, and difficulty in achieving continuous production of the composite electrode. To address the above problems, the embodiments of the present application provide a composite electrode preparation device and a control method thereof, which can achieve closed-loop control of the unwinding unit, preheating unit, rolling unit, film tearing unit and winding unit, thereby achieving efficient and continuous production of composite electrodes and improving product yield.

[0025] The technical solutions of the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0026] Figure 1 Schematic diagram of the overall structure of a composite electrode preparation device shown in an embodiment of the present application; Figure 2 It is a schematic diagram of the coordination of the unwinding unit, preheating unit and rolling unit of the composite electrode preparation device shown in an embodiment of the present application.

[0027] See also Figure 1 and Figure 2 The present application provides a composite electrode preparation device, comprising an unwinding unit 110, a preheating unit 120, a rolling unit 130, a film-tearing unit 150, and a rewinding unit; the unwinding unit 110, the preheating unit 120, the rolling unit 130, the film-tearing unit 150, and the rewinding unit are arranged sequentially along a predetermined trajectory and are connected in series with the traveling electrode 102 and the electrolyte membrane 101. The present application also includes a control device, which is electrically connected to the unwinding unit 110, the preheating unit 120, the rolling unit 130, the film-tearing unit 150, and the rewinding unit, and is used to control the coordinated operation of the unwinding unit 110, the preheating unit 120, the rolling unit 130, the film-tearing unit 150, and the rewinding unit according to a set program.

[0028] Among them, the unwinding unit 110 includes an electrode unwinding mechanism and an electrolyte membrane unwinding mechanism, which are respectively used to unroll the coils of the electrode 102 and the electrolyte membrane 101 and then transmit them to the preheating unit 120 at a set rate; the preheating unit 120 includes an electrode preheating mechanism and an electrolyte membrane preheating mechanism, which are respectively used to heat the electrode 102 and the electrolyte membrane 101 output by the unwinding device to a preset temperature and then transmit them to the rolling unit; the rolling unit 130 includes a roller assembly, which is used to roll the electrode 102 and the electrolyte membrane 101 after heat treatment by the preheating assembly to form a composite electrode sheet; the film tearing unit 150 is arranged at the output end of the rolling assembly, and is used to tear off the base film on the surface of the composite electrode sheet output by the rolling assembly; the winding unit is used to wind up the composite electrode sheet output by the rolling mechanism and the base film torn off by the film tearing unit. The solution provided in the present application can transfer the solid electrolyte layer to the electrode surface through the coordination of the unwinding unit, preheating unit, rolling unit, film tearing unit and winding unit, thereby forming a composite electrode. Through real-time linkage adjustment of the parameters of the unwinding unit, preheating unit and rolling unit, the difference in ductility between the electrode and the electrolyte membrane can be dynamically compensated. Combined with the pressure adjustment of the roller assembly, the microcracks caused by wrinkles or interface stress concentration can be reduced, thereby improving the yield of the composite electrode. At the same time, through closed-loop control of the unwinding unit, preheating unit, rolling unit, film tearing unit and winding unit, the synchronization of the coil transmission is achieved, thereby realizing continuous production.

[0029] It is worth noting that the electrode 102 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 102 can also be a positive electrode or negative electrode sheet coated with an active material layer on the surface of the current collector, and the solid electrolyte is transferred to the surface of the active material layer of the electrode sheet by a preparation device. The solution of the present application is to transfer the solid electrolyte to the surface of the current collector as an example. In other embodiments, the solid electrolyte can also be transferred to the surface of the electrode sheet. The specific type of electrode 102 is not limited in the present application.

[0030] The electrolyte membrane 101 of the present application includes a base membrane and a solid electrolyte attached to the base membrane, with the side having the solid electrolyte facing the current collector. After rolling by a rolling unit, the electrolyte membrane 101 is combined with the current collector, and the base membrane is torn off by a film tearing unit to form a composite electrode.

[0031] Continue to see Figure 2The solution of this embodiment includes an upper transmission path A1, a middle transmission path B, and a lower transmission path A2. The electrode unwinding mechanism and the electrode preheating mechanism are located in the middle transmission path B. The electrolyte membrane unwinding mechanism and the electrolyte membrane preheating mechanism are each provided with two groups, located in the upper transmission path A1 and the lower transmission path A2, respectively. The electrolyte membrane 101 of the upper transmission path A1 has a solid electrolyte side facing the upper surface of the current collector, and the electrolyte membrane 101 of the lower transmission path A2 has a solid electrolyte side facing the lower surface of the current collector. After rolling by the rolling unit 130, the upper and lower surfaces of the current collector form a dense composite interface with the corresponding solid electrolyte.

[0032] In this embodiment, the unwinding unit 110 includes an electrode unwinding roller 110 b and an electrolyte membrane unwinding roller 110 a , which are respectively used to carry the coils of the electrode 102 and the electrolyte membrane 101 and unwind the coils of the electrode 102 and the electrolyte membrane 101 .

[0033] In some embodiments, the preparation apparatus includes a first deflection correction mechanism 112 and a second deflection correction mechanism 121. The first deflection correction mechanism 112 and the second deflection correction mechanism 121 are each provided with three groups, which respectively perform synchronous deflection correction on the electrode 102 and the electrolyte membrane 101 on both sides. The first deflection correction mechanism 112 is provided in the unwinding unit and is used to correct the deflection of the electrode 102 and the electrolyte membrane 101 released by the electrode unwinding mechanism and the electrolyte membrane unwinding mechanism. The first deflection correction mechanism 121 performs an initial alignment adjustment on the current collector and the electrolyte membrane 101 during the unwinding phase, eliminating lateral offset during the initial unwinding of the material and ensuring that the current collector and the electrolyte membrane 101 enter the preheating unit in an aligned state.

[0034] The second correcting mechanism 121 is arranged in the preheating unit 120, and is used to correct the electrode 102 and the electrolyte membrane 101 before or after preheating; wherein, a bonding component 123 is provided between the preheating unit 120 and the rolling unit 130, and the second correcting mechanism 121 is used to correct the electrode 102 and the electrolyte membrane 101 and then enter the bonding component 123, and the bonding component 123 is used to introduce the electrode 102 and the electrolyte membrane 101 into the rolling unit 130 after pre-bonding.

[0035] The second correction mechanism 121 can be arranged on the input side or the output side of the preheating unit. When it is arranged on the input side, it ensures that the electrode 102 and the electrolyte are in a center-aligned state during the preheating process, reduces the temperature deviation of the electrode 102 and the electrolyte membrane 101 due to the difference in contact angle or contact area with the preheating roller, and can make the electrode 102 and the electrolyte membrane 101 on both sides be transferred to the bonding component 123 in a center-aligned state, ensuring good alignment accuracy during pre-bonding.

[0036] In some embodiments, a second deflection correction mechanism 121 is provided at the output side of the preheating unit 120. The second deflection correction mechanism 121 can perform secondary deflection correction based on the thermal expansion deformation of the material during the preheating process, eliminating the thermal expansion difference between the electrode 102 and the base film caused by the temperature gradient. This allows the electrode 102 and the electrolyte membrane 101 on both sides to be transferred to the bonding assembly in a center-aligned state, further ensuring good alignment accuracy during pre-bonding. Based on the initial deflection correction data from the first deflection correction mechanism 112 and the preheating temperature gradient of the electrode 102 and electrolyte membrane 101, the second deflection correction mechanism 121 can dynamically correct the deflection correction amount, improving the alignment accuracy of the three-layer material strip entering the bonding assembly 123, and avoiding wrinkles, bubbles, and other phenomena in the composite electrode after rolling in the rolling unit due to insufficient alignment accuracy.

[0037] This embodiment also includes a first tension control mechanism 115. Three first tension control mechanisms 115 are provided, each for synchronously controlling the tension of the electrode 102 and the electrolyte membrane 101 on both sides. The first tension control mechanism 115 is located downstream of the unwinding roller of the unwinding unit and is used to control the tension of the electrode 102 and electrolyte membrane 101 during their transfer to the preheating unit. The tension control parameters for the electrode 102 and electrolyte membrane 101 are different.

[0038] In some embodiments, the unwinding unit further includes a first cleaning assembly 114 , which includes a brush assembly for contacting the surface of the electrode and the electrolyte membrane to remove impurities attached to the surface of the electrode and the electrolyte membrane.

[0039] The three groups of first tension control mechanisms 115 can not only compensate for the difference in elongation between the electrode 102 and the electrolyte membrane 101 through graded control of the high tension of the electrode 102 and the low tension of the base membrane, but also avoid path deviation caused by the difference in material stiffness during the unwinding stage. The tension gradient difference between the electrode 102 and the base membrane enables the two to deform synchronously during the preheating process, avoiding wrinkles in the composite electrode or breakage of the base membrane after rolling due to uneven tension.

[0040] Figure 3 It is a schematic diagram of the coordination of the rolling unit, pre-film tearing unit and film tearing and winding mechanism of the composite electrode preparation device shown in the embodiment of the present application.

[0041] See also Figure 2 and Figure 3The electrode preheating mechanism and the electrolyte membrane preheating mechanism 122 are each provided with two preheating rollers 1221, and the two preheating rollers 1221 are used to contact the two side surfaces of the electrode 102 or the electrolyte membrane 101 respectively, and are used to heat the two side surfaces of the electrode 102 or the electrolyte membrane 101; wherein, the arrangement forms of the two preheating rollers 1221 in the electrode preheating mechanism and the electrolyte membrane preheating mechanism are different, and the preheating rollers 1221 form a heating contact surface with a set area parameter with the surface of the electrode 102 or the electrolyte membrane 101. Among them, the two preheating rollers 1221 are arranged in an S-shape with an upper and lower and / or left and right offset. The material strips of the electrode 102 and the electrolyte membrane 101 pass between the two preheating rollers 1221 in an S-shaped winding path, forming bilateral contact with the roller surface of the preheating roller 1221. The material strips and the two rollers have a set contact arc length or contact angle. The effective heating area is equal to the product of the contact arc length (or angle) and the width of the material strip, ensuring that the material strip has a set residence time in the S-shaped winding path, thereby ensuring sufficient heat transfer on both sides of the material strip, and avoiding curling deformation caused by single-sided heating or difficult to control heating time in related technologies.

[0042] Both the electrode preheating mechanism and the electrolyte membrane preheating mechanism include a temperature detection assembly and a temperature control unit. The temperature detection assembly is used to detect the temperature of the electrode 102 or electrolyte membrane 101. The temperature control unit is electrically connected to the preheating roller 1221 and the temperature detection assembly, and is used to receive the temperature information detected by the temperature detection assembly and adjust the temperature of the preheating roller 1221 to a set value based on the temperature information. The temperature detection assembly includes a non-contact infrared thermometer, which is installed above or below the electrode 102 and electrolyte membrane 101 to collect the surface temperature of the electrode 102 or electrolyte membrane 101. When the temperature deviation of the preheating roller 1221 unit exceeds a set threshold, the heating mechanism is triggered to coordinately compensate the temperature of the preheating roller 1221 until it reaches a set range.

[0043] In some embodiments, the laminating assembly 123 includes two laminating rollers 1231 arranged in parallel, with a gap between the two laminating rollers 1231. The electrode 102 and the electrolyte membrane 101 are pre-laminated and smoothed by the two laminating rollers 1231 in the gap and then transferred to the rolling unit 130. By designing the gap between the two parallel laminating rollers 1231 and combining the ductility characteristics of the preheated electrode 102 and the electrolyte membrane 101, the lateral alignment of the materials and the synchronous control of the longitudinal tension are achieved. For example, the electrode 102 and the base membrane are pre-laminated by the two laminating rollers 1231 in the gap, applying micro-pressure to eliminate the offset caused by the thermal expansion difference, thereby reducing the interface porosity of the composite electrode after rolling. In addition, the laminating roller 1231 can be a steel roller with a smooth surface, or it can be a roller with an elastic material wrapped on the surface. The material is dynamically smoothed by the rotation of the roller, eliminating wrinkles or micro-cracks caused by uneven preheating or tension fluctuations, and avoiding or reducing the edge cracking rate of the composite electrode after rolling.

[0044] The rolling unit 130 includes a rolling group and a roll gap adjustment mechanism. The rolling group includes two rolling rollers 131 opposite each other in the longitudinal direction. The side between the two rolling rollers 131 close to the preheating mechanism is a rolling inlet. The pre-laminated electrode 102 and electrolyte membrane 101 can be transferred laterally to between the two rolling rollers 131 through the rolling inlet, so that the two rolling rollers 131 apply pressure to the electrode 102 and the electrolyte membrane 101 on the upper and lower sides.

[0045] Among them, a liquid circulation channel is provided in the roller 131, and the liquid circulation channel is arranged along the extension of the rolling surface of the roller 131, which is used to transfer the heat of the heat-conducting liquid to the rolling surface, so that the roller can apply pressure to the pre-bonded electrode 102 and electrolyte membrane 101 at a set temperature; the driving device is connected to the roller transmission to provide rotational power for the roller, so that the roller can rotate at a set speed and direction, thereby realizing continuous application of pressure to the moving electrode 102 and electrolyte membrane 101.

[0046] The roll gap adjustment mechanism of the present application can be an AGC hydraulic servo roll gap adjustment system or an oblique iron mechanism. Among them, the continuous pole piece adopts the AGC hydraulic servo roll gap adjustment system, and the discontinuous pole piece adopts the oblique iron roll gap adjustment mechanism. The AGC hydraulic servo roll gap adjustment system is based on the closed-loop control of the displacement sensor and the servo valve to realize the constant pressure or constant gap mode switching during the rolling of the continuous pole piece, and dynamically compensate for the fluctuation of the pole piece thickness. In response to the low-speed rolling requirements of the discontinuous pole piece, the oblique iron mechanism reduces the adjustment resistance through the three oblique iron components and the universal ball rolling friction design, and realizes online adjustment without pressure relief.

[0047] In some embodiments, the rolling unit 130 also includes a roller surface cleaning mechanism, which includes an adaptive scraper mechanism. The roller and scraper are driven by a cylinder to synchronously contact the roller surface. The angle between the scraper blade and the roller surface is dynamically adjusted by the angle plate, and a dust collection box and a negative pressure discharge port are integrated to collect the peeling material in real time.

[0048] Some embodiments further include a thickness detection module 160, located downstream of the film-tearing unit 150. The thickness detection module 160 is linked to the rolling unit 130 and is used to detect the thickness of the composite electrode after film-tearing. The rolling unit 130 adjusts the roll gap parameters of the roller assembly based on this thickness information. The closed-loop linkage between the thickness detection module 160 and the rolling unit 130 significantly improves the manufacturing accuracy and yield of the composite electrode. The thickness detection module 160 provides real-time feedback on the thickness of the composite electrode after film-tearing, and in conjunction with the hydraulic servo system, dynamically adjusts the roll gap to reduce lateral thickness deviation and longitudinal fluctuation.

[0049] See also Figure 3In some embodiments, a film tearing unit 150 is provided at the output end of the rolling unit 130 and is used to separate the base film of the electrolyte membrane 101 from the composite electrode sheet. A first cooling mechanism 140 is provided upstream of the film tearing unit 150. The temperature control parameters of the first cooling mechanism 140 are associated with the properties of the base film of the electrolyte membrane 101. The first cooling mechanism 140 includes two cooling rollers 141, which contact the surfaces of both sides of the composite electrode sheet and are used to cool the composite electrode sheet to a preset temperature. This creates a predetermined temperature difference between the composite electrode sheet before and after cooling, resulting in a thermal stress difference between the substrate and the base film of the composite electrode sheet, thereby reducing the tear strength of the base film and improving the tearing quality of the composite electrode sheet.

[0050] The film-tearing unit 150 includes a film-tearing roller assembly 151 and a guide roller assembly 152. The film-tearing roller assembly 151 is used to contact predetermined positions on both sides of the composite electrode sheet, causing the base film on both sides of the composite electrode sheet to be peeled off step by step or synchronously, thereby achieving flexible switching between step-by-step and synchronous film peeling to adapt to different material and process requirements. The guide roller assembly 152 is located on the output side of the film-tearing roller assembly and is used to guide the composite electrode sheet in a predetermined direction after film peeling. The guide roller assembly is used to adjust the base film to a set tearing angle through displacement.

[0051] In some embodiments, the film tearing unit further includes a dust collection component 153 and a second cleaning component 154. The dust collection component 153 includes a negative pressure generating mechanism and a dust collection member connected to the negative pressure generating mechanism through a pipe. The dust collection member is placed at the film separation point of the composite electrode to absorb impurities generated after the film is torn off. The second cleaning component 154 can be a brush component, an air knife, or an ultrasonic dust collector. This application does not limit this. When the second cleaning component 154 is a brush component, the brush component is used to contact the surface of the composite electrode after the film is torn to remove impurities attached to the surface of the composite electrode. It is worth noting that when the second cleaning component 154 is an air knife or an ultrasonic dust collector, the impurities attached to the surface of the composite electrode can be removed in a corresponding manner.

[0052] See also Figure 3 and Figure 4 In some embodiments, a visual inspection module 1591 and a marking module 171 are further included. The visual inspection module 1591 is electrically connected to the marking module 171. The visual inspection module 1591 is used to detect defects on the composite electrode. The marking module 171 marks the category of the composite electrode based on the defect detection result of the visual inspection module 1591. Through the coordinated control of the visual inspection module 1591 and the marking module 171, accurate identification and efficient marking of composite electrode defects are achieved.

[0053] It also includes a second cooling mechanism 159, which is used to obtain the temperature information of the composite electrode after the film is torn off, and based on the temperature information, reduce the temperature of the composite electrode to close to normal temperature, so that the composite electrode meets the detection temperature requirement.

[0054] Some embodiments further include a second tension control mechanism 158 and a third tension control mechanism 172. The second tension control mechanism 158 is disposed between the film tearing unit 150 and the visual inspection module 1591 and is configured to control the tension of the composite electrode after film tearing, so that the composite electrode enters the visual inspection module 1591 at a set tension. The second tension control mechanism 158 adjusts the tension of the electrode after film tearing in real time, eliminating electrode jitter or local wrinkles caused by sudden changes in tension, enabling the visual inspection module to capture smaller defects and thereby improving inspection accuracy.

[0055] The winding unit includes a pole piece winding mechanism 175 and a base film winding mechanism 157. The base film winding mechanism 157 is located downstream of the guide roller assembly 152 and comprises two groups, each used to wind the strip of base film torn off from both sides of the pole piece into a roll. The base film winding mechanism 157 is equipped with a torque assembly and a third correction mechanism 156. The torque assembly is used to ensure that the base film winding mechanism rewinds the torn base film within a preset torque range and dynamically adjusts the winding speed based on real-time tension detection. The third correction mechanism 156 adjusts the base film centering to eliminate lateral deviation of the base film before winding.

[0056] Specifically, the base film winding mechanism 157 may include a winding spindle, a torque motor, and a tension sensing module. The winding spindle is used to wind the diaphragm. The torque motor may be a permanent magnet synchronous motor or a servo motor. The rated torque parameter range is set to 100-150N according to the material properties of the diaphragm. A tension detector is installed at the entrance of the winding station. When the real-time tension exceeds 100-150N, the winding motor is controlled to slow down and the winding process slows 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 process speeds up. With such a setting, the tension fluctuation of the diaphragm can be reduced during the winding process, so that the winding spindle is wound under constant tension, reducing the phenomenon of piling or tape breakage caused by tension fluctuation during the winding process.

[0057] See also Figure 4, the pole piece winding mechanism 157 is used to wind the composite pole piece, and the third tension control mechanism 172 is provided in the pole piece winding mechanism, and is used to control the tension of the composite pole piece before winding at a set value. The third tension control mechanism 172 can dynamically adjust the winding tension gradient to avoid poor winding or indentation of the inner pole piece due to excessive tension in the outer layer. In this embodiment, the tension control range of the third tension control mechanism 172 is 100-150N. When the tension exceeds this tension, the winding is slowed down; when the tension is less than this tension, the winding is accelerated. This reduces the tension fluctuation during roll change and realizes dynamic winding during continuous production of the composite pole piece. The pole piece winding machine 175 is also equipped with a fourth deviation correction mechanism 174, which adjusts the centering of the composite pole piece base film to eliminate the lateral offset of the composite pole piece before winding.

[0058] In some embodiments, a first splicing platform 113, a second splicing platform 155, and a third splicing platform 173 are further included. The first splicing platform is located on the unwinding unit, the second reception platform is located on the base film winding mechanism, and the third reception platform is located on the electrode winding mechanism. The three splicing platforms are used to perform connection operations on the two ends of the strip. For example, the operator can accurately align the fracture in the splicing operation section and complete the splicing operation. When the electrode, electrolyte membrane, or base membrane breaks during the winding process due to abnormal tension, material defects, or other reasons, the operator can quickly reconnect the broken part through the splicing platform to avoid downtime or waste accumulation, thereby ensuring the continuity and stability of the electrode and electrolyte membrane unwinding, base membrane recovery, and electrode winding processes.

[0059] In some embodiments, a whole-machine protective cover and an environmental control system (not shown) are further included; the whole-machine protective cover surrounds the unwinding unit, the preheating unit, the rolling unit, the film tearing unit and the winding unit, 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.

[0060] The above describes the composite electrode manufacturing device of the present application. Accordingly, the present application also provides a control method for the composite electrode manufacturing device.

[0061] Figure 5 It is a flow chart of a control method for a composite electrode preparation device shown in an embodiment of the present application.

[0062] Please also see Figure 1 and Figure 5 , the method comprises the following steps: S110 , controlling the electrode unwinding mechanism and the electrolyte membrane unwinding mechanism to operate synchronously, so that the coils of the electrode 102 and the electrolyte membrane 101 to be composited are respectively transported to the preheating unit at a set rate.

[0063] In this step, the electrode 102 and the electrolyte membrane 101 are unwound synchronously by closed-loop control of the speed of the unwinding shaft of the electrode 102 and the unwinding shaft of the electrolyte membrane 101.

[0064] S120 , controlling the preheating unit to independently heat the electrode 102 and the electrolyte membrane 101 to corresponding preset temperatures and then transporting them to the rolling unit.

[0065] In this step, the preheating roller is controlled to heat the electrode 102 and the electrolyte membrane 101. The preheated electrode 102 and the electrolyte membrane 101 are pre-pressed by the laminating assembly and then enter the rolling unit. S130 , controlling the rolling unit to synchronously roll and composite the preheated electrode 102 and the electrolyte membrane 101 to form a composite electrode sheet.

[0066] In this step, while the rolling unit performs composite rolling, the AGC cylinder and the inclined iron mechanism are used in dual modes to collaboratively control the roller spacing. The roller surface is maintained at the required working temperature by the mold temperature controller C. At the same time, the oil cooler implements circulating cooling on the bearing seat, and the scraper mechanism continuously removes residues on the roller surface at a set gap.

[0067] S140, controlling the film-tearing unit to perform a base film separation operation on the rolled composite electrode piece, and controlling the winding unit to perform roll-up recovery on the composite electrode piece and the separated base film.

[0068] The solution provided in the present application can transfer the solid electrolyte layer to the electrode surface through the coordination of the unwinding unit, preheating unit, rolling unit, film tearing unit and winding unit, thereby forming a composite electrode. Through real-time linkage adjustment of the parameters of the unwinding unit, preheating unit and rolling unit, the difference in ductility between the electrode and the electrolyte membrane can be dynamically compensated. Combined with the pressure adjustment of the roller assembly, the microcracks caused by wrinkles or interface stress concentration can be reduced, thereby improving the yield of the composite electrode. At the same time, through closed-loop control of the unwinding unit, preheating unit, rolling unit, film tearing unit and winding unit, the synchronization of the coil transmission is achieved, thereby realizing continuous production.

[0069] In some embodiments, the electrode unwinding mechanism and the electrolyte membrane unwinding mechanism are controlled to operate synchronously, including: implementing a first dynamic correction through a first correction mechanism to keep the electrode 102 and the electrolyte membrane 101 aligned before entering the preheating unit. During the transmission process, the first correction mechanism monitors the position deviation between the electrode 102 and the base membrane in real time, and adjusts the lateral displacement of the unwinding roller through feedback from a photoelectric sensor to ensure that the material enters the preheating unit in alignment. In some embodiments, three groups of edge detection sensor arrays are set at the outlets of the electrode 102 unwinding mechanism and the electrolyte membrane 101 unwinding mechanism to obtain the lateral offset of the electrode piece and the electrolyte membrane 101 in real time; the theoretical centerline reference value is calculated based on the width difference of the multi-material path, and the three-way correction mechanism is driven by a controller to synchronously adjust the deflection angle of the guide rollers of the three materials so that the measured centerline deviation of the unwound electrode piece and the electrolyte membrane 101 is less than the set value.

[0070] In some embodiments, the preheating unit is controlled to independently heat the electrode 102 and electrolyte membrane 101 to corresponding preset temperatures before transporting them to the rolling unit. This includes: performing a second active deflection correction at the preheating unit exit via a second deflection correction mechanism to adjust the relative position deviation of the electrode 102 and electrolyte membrane 101 to a preset threshold range; controlling the bonding assembly to apply a pre-compression force to the electrode 102 and electrolyte membrane 101 after the second deflection correction, forming a pre-composite structure before introduction into the rolling unit. A high-precision linear array CCD can be used to scan the edges of the three materials. The thermal deformation can be predicted by combining with a database of the material's thermal expansion coefficients. The centerline reference value is dynamically corrected based on the predicted data. Independent servo motors drive three sets of deflection correction guide rollers to align the centerlines of the three materials before the preheating rollers, ensuring that the center deviation upon entering the heating rollers is less than the set value.

[0071] The solution of this application uses a first-stage correction mechanism to address initial deviations caused by mechanical errors in the unwinding mechanism, and a second-stage correction mechanism to eliminate dynamic offsets during material transfer. This effectively improves the centering accuracy of the three streams of material before entering the rolling unit, thereby preventing wrinkles, bubbles, and poor interfacial bonding density in the composite electrode after rolling.

[0072] In some embodiments, the method further includes: establishing independent tension closed-loop control in the electrode 102 unwinding channel and the electrolyte membrane 101 unwinding channel through corresponding tension control mechanisms; dynamically adjusting the matching relationship between the electrode 102 transmission tension and the electrolyte membrane 101 transmission tension according to the difference in material properties, and stabilizing the electrode 102 transmission tension and the electrolyte membrane 101 transmission tension within a preset range before the entrance of the preheating unit.

[0073] In some embodiments, the method further includes: temperature control of the rolled composite electrode by a first cooling component, and performing a film tearing operation by a film tearing unit when the base film peeling interface reaches a predetermined adhesion strength; and synchronously adjusting the dynamic balance between the winding tension and the film tearing traction force by a third tension control mechanism to maintain the morphological stability of the composite electrode during the winding process.

[0074] The technical solution of this application achieves efficient and stable operation of composite electrode production through coordinated control of multiple material paths and closed-loop feedback throughout the entire process. The coordinated control of the unwinding unit and the preheating unit ensures the precise alignment of the multi-layer materials, and the interface bonding quality between the electrolyte membrane 101 and the electrode is significantly improved in conjunction with temperature-controlled preheating. The coordinated control of the cooling system and the adjustable-angle film tearing unit enables efficient tearing of the base film. Dual quality control through visual recognition and thickness detection can improve product yield, achieving efficient, high-quality, and environmentally friendly continuous production of composite electrodes while ensuring process accuracy.

[0075] 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: An unwinding unit, a preheating unit, a rolling unit, a film tearing unit, and a winding unit; the unwinding unit, the preheating unit, the rolling unit, the film tearing unit, and the winding unit are arranged in sequence according to a predetermined track and are connected in series by the traveling electrode and electrolyte membrane; The unwinding unit includes an electrode unwinding mechanism and an electrolyte membrane unwinding mechanism, and the electrode unwinding mechanism and the electrolyte membrane unwinding mechanism are respectively used to unwind the coils of the electrode and the electrolyte membrane and transfer them to the preheating unit at a set rate; The preheating unit includes an electrode preheating mechanism and an electrolyte membrane preheating mechanism, which are respectively used to heat the electrode and electrolyte membrane output by the unwinding device to a preset temperature and then transmit them to the rolling unit; The rolling unit includes a roller assembly, which is used to roll the electrode and electrolyte membrane after the preheating assembly is heated to form a composite electrode sheet; The film-tearing unit is provided at the output end of the rolling assembly, and is used to tear off the base film on the surface of the composite electrode output by the rolling assembly; The winding unit is used to wind up the composite electrode output by the roller mechanism and the base film torn off by the film tearing unit.

2. The device according to claim 1, characterized in that include: a first deviation correction mechanism, provided in the unwinding unit, for performing a first deviation correction on the electrode and electrolyte membrane released by the electrode unwinding mechanism and the electrolyte membrane unwinding mechanism, so that the electrode and electrolyte membrane enter the preheating unit in a centered state; A second correcting mechanism is provided in the preheating unit and is used for performing a second correcting on the electrode and the electrolyte membrane before or after preheating; wherein, a bonding component is provided between the preheating unit and the rolling unit, and the second correcting mechanism is used for allowing the electrode and the electrolyte membrane to enter the bonding component after the second correcting, and the bonding component is used for introducing the electrode and the electrolyte membrane into the rolling unit after pre-bonding.

3. The device according to claim 1, characterized in that include: The rolling unit includes a roller group and a roller gap adjustment mechanism; The roller group includes two rollers that are opposed to each other in the longitudinal direction. A roller pressing inlet is provided between the two rollers on the side close to the preheating mechanism. The pre-laminated electrode and electrolyte membrane can be transferred transversely to between the two rollers through the roller pressing inlet, so that the two rollers apply pressure to the pre-laminated electrode and electrolyte membrane on the upper and lower sides. The roll gap adjustment mechanism includes an AGC hydraulic servo roll gap adjustment system or an inclined iron mechanism, wherein the AGC hydraulic servo roll gap adjustment system is used for roll gap adjustment in a continuous pole piece scenario, and the inclined iron mechanism is used for roll gap adjustment in a discontinuous pole piece scenario.

4. The device according to claim 1, characterized in that: The film tearing unit is arranged at the output end of the rolling unit, and is used to separate the base membrane of the electrolyte membrane from the composite electrode sheet; wherein, a first cooling component is provided upstream of the film tearing unit, and the first cooling component is used to cool the composite electrode sheet formed after the rolling process of the rolling unit to a second preset temperature, so that the film tearing unit can perform the film tearing operation on the composite electrode sheet at the second preset temperature; the temperature control parameters of the first cooling component are associated with the properties of the base membrane of the electrolyte membrane.

5. The device according to claim 1, characterized in that The downstream of the film tearing unit includes: 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 provided downstream of the film tearing unit. The thickness detection module is linked to the rolling unit. The thickness detection module is used to detect the thickness information of the composite electrode after film tearing. The roll gap adjustment mechanism of the rolling unit adjusts the roll gap parameters of the rolling unit based on the thickness information.

6. The device according to claim 5, characterized in that include: a first tension control mechanism, provided downstream of the unwinding roller of the unwinding unit, for controlling the tension of the electrode and the electrolyte membrane during transmission to the preheating unit, wherein the tension control parameters corresponding to the electrode and the electrolyte membrane are different; A second tension control mechanism is provided between the film tearing unit and the visual inspection module, and is used to control the tension of the composite electrode after the film is torn, so that the composite electrode enters the visual inspection module under the set tension; The third tension control mechanism is provided in the winding unit and is used to control the tension of the composite electrode before winding to a set value.

7. A control method for a preparation device according to any one of claims 1 to 6, characterized in that: include: Controlling the synchronous operation of the electrode unwinding mechanism and the electrolyte membrane unwinding mechanism so that the electrode sheet and electrolyte membrane coils to be composited are respectively transported to the preheating unit at a set rate; Controlling the preheating unit to independently heat the electrode and the electrolyte membrane to corresponding preset temperatures and then transporting them to the rolling unit; Controlling the rolling unit to synchronously roll and laminate the preheated electrode and electrolyte membrane to form a composite electrode sheet; The film-tearing unit is controlled to perform the base film separation operation on the rolled composite electrode, and the winding unit is controlled to implement the roll recovery of the finished composite electrode and the separated base film.

8. The method according to claim 7, characterized in that The control electrode unwinding mechanism and the electrolyte membrane unwinding mechanism are operated synchronously, comprising: In the unwinding unit, the first correction mechanism is controlled to implement the first dynamic correction, so that the electrode and the electrolyte membrane are kept in a centered state and are transferred to the preheating unit at a set rate; The controlling preheating unit heats the electrodes and the electrolyte membrane independently to corresponding preset temperatures and then transports them to the rolling unit, including: A second active deviation correction is performed at the outlet of the preheating unit by a second deviation correction mechanism to adjust the relative position deviation between the electrode and the electrolyte membrane to a preset threshold range; The laminating assembly is controlled to apply a pre-compression force to the electrode and the electrolyte membrane after the secondary deviation correction, and the pre-composite structure is formed and then introduced into the rolling unit.

9. The method according to claim 7, wherein: Independent tension closed-loop control is established in the electrode unwinding channel and the electrolyte membrane unwinding channel through corresponding tension control mechanisms; The matching relationship between the electrode transmission tension and the electrolyte membrane transmission tension is dynamically adjusted according to the difference in material properties, and the electrode transmission tension and the electrolyte membrane transmission tension are stabilized within a preset range before the inlet of the preheating unit.

10. The method according to claim 7, characterized in that The temperature of the rolled composite electrode is controlled by the first cooling assembly, and the film peeling unit performs a film peeling operation when the base film peeling interface reaches a predetermined adhesion strength; The dynamic balance between the winding tension and the film tearing traction force is synchronously adjusted by the third tension control mechanism to keep the shape of the composite electrode stable during the winding process.

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