Separator unwinding device and battery manufacturing apparatus

Abstract

The application relates to a separator unwinding device and a battery manufacturing device. The separator unwinding device comprises a tension control assembly arranged on a separator transmission path, and the tension control assembly is located between a separator unwinding mechanism and a separator swing roller. The tension control assembly comprises a dynamic buffer roller, a tension detection roller and a tension swing roller. The dynamic buffer roller is driven by a first driving element to reciprocate along the tension detection roller in a direction of approaching or moving away, and is used for realizing buffer storage of the separator. The tension detection roller is used for real-time detection of the tension of the separator. The tension swing roller comprises a swing arm and a swing roller arranged at one end of the swing arm. The end of the swing arm, which is away from the swing roller, is rotatably connected to a rotation center. The swing arm is driven by a second driving element to swing around the rotation center. The scheme provided by the application can effectively reduce the physical length of the separator transmission path, reduce the volume of the separator unwinding device, and reduce the maintenance difficulty and cost.

Description

Technical Field

[0001] This application relates to the field of battery manufacturing technology, and in particular to separator unwinding apparatus and battery manufacturing equipment. Background Technology

[0002] In lithium battery manufacturing processes, the separator unwinding belt is a key front-end system for cell stacking / winding, and its stability directly affects cell yield and production efficiency.

[0003] In related technologies, current mainstream equipment generally adopts a complex roller system structure of 8-12 rollers. The lengthy multi-roller layout not only leads to a longer transmission path, significantly increasing the space occupied by the equipment and the difficulty of maintenance; at the same time, for ultra-thin diaphragms, the excessively long path and the contact points of multiple rollers are prone to stress concentration and wavy patterns, significantly increasing the membrane breakage rate; in addition, the separate control of the tension detection roller, buffer roller and correction roller causes signal coordination lag, which leads to an increase in the cumulative error of diaphragm tension breakage and correction, resulting in a high tensile deformation rate of ultra-thin diaphragms. Utility Model Content

[0004] To solve or partially solve the problems existing in the related technologies, this application provides a diaphragm unwinding device and battery manufacturing equipment, which can effectively reduce the physical length of the diaphragm transmission path, reduce the volume of the diaphragm unwinding device, and reduce maintenance difficulty and cost.

[0005] The first aspect of this application provides a diaphragm unwinding device, comprising: A tension control component is disposed on the diaphragm transport path, the tension control component being located between the diaphragm unwinding mechanism and the diaphragm swing roller; The tension control component includes a dynamic buffer roller, a tension detection roller, and a tension swing roller. The dynamic buffer roller is driven by the first driving element to reciprocate along the direction of approaching or moving away from the tension detection roller, in order to achieve diaphragm buffering. The tension detection roller is used for real-time detection of diaphragm tension; The tension swing roller includes a swing arm and a swing roller disposed at one end of the swing arm. The end of the swing arm away from the swing roller is rotatably connected to a rotation center. The swing arm is driven by a second drive member to swing around the rotation center.

[0006] In one embodiment, a first guide roller is provided near the diaphragm unwinding mechanism, and the diaphragm released by the diaphragm unwinding mechanism enters the tension control assembly after passing through the first guide roller; wherein, the tension control assembly further includes a second guide roller, the second guide roller being aligned vertically with the tension detection roller, and the dynamic buffer roller having a set distance from the tension detection roller or the second guide roller.

[0007] In one embodiment, the device further includes a diaphragm swing roller and a third guide roller disposed between the tension control component and the diaphragm swing roller. The third guide roller is used to guide the tension-adjusted diaphragm to the diaphragm swing roller. The diaphragm swing roller is configured to swing left and right at the stacking station in rhythm with the electrode transport, in order to provide a flat diaphragm substrate and recover excess diaphragm.

[0008] In one embodiment, the tension detection roller, the tension swing roller, and the third guide roller are arranged sequentially on the transmission path of the diaphragm; The distance between the tension detection roller and the swing roller is greater than the distance between the swing roller and the third guide roller, the height of the swing roller is greater than the height of the third guide roller, and the diaphragm covers an area of ​​more than 90° at the wrap angle of the swing roller.

[0009] In one embodiment, the tension detection roller, the tension swing roller, and the third guide roller are located at the three vertices of a virtual triangle, which is an asymmetrical triangle.

[0010] In one embodiment, the system further includes a web-correcting system, comprising a web-correcting sensor disposed at the diaphragm swing roller, and a web-correcting drive for driving the diaphragm unwinding mechanism; the web-correcting sensor is signal-connected to the web-correcting drive, and the web-correcting drive is used to drive the diaphragm unwinding mechanism to move in the opposite direction to the offset of the diaphragm. The diaphragm unwinding mechanism includes two roll assemblies arranged in parallel, with an automatic tape-connecting mechanism between the two roll assemblies for continuous switching of the diaphragm roll material; wherein, the two roll assemblies are connected to an unwinding drive, and a rangefinder is provided above the two roll assemblies, the rangefinder being used to detect the roll diameter of the two roll assemblies in real time and feed it back to the speed control module of the unwinding drive.

[0011] In one implementation, the diaphragm unwinding mechanism includes: Two roll assemblies are arranged side by side, and an automatic tape-connecting mechanism is provided between the two roll assemblies to realize continuous switching of diaphragm rolls; wherein, the two roll assemblies are connected to an unwinding drive, and the unwinding drive is used to drive the roll assemblies to rotate.

[0012] In one implementation, a rangefinder is provided above the material roll assembly. The rangefinder is used to detect the roll diameter of the two material roll assemblies in real time and feed it back to the speed control module of the unwinding drive.

[0013] In one embodiment, the number of rollers on the diaphragm transport path is less than or equal to six.

[0014] A second aspect of this application provides a battery manufacturing apparatus, comprising: The diaphragm unwinding device as described in the first aspect above; and A stacking device, wherein the diaphragm unwinding device is used to transfer the diaphragm to the stacking device.

[0015] The technical solution provided in this application may include the following beneficial effects: The proposed solution shortens the traditional transmission path length through the integrated design of a dynamic buffer roller, a tension detection roller, and a tension swing roller, creating a compact spatial layout. This reduces the size of the diaphragm unwinding device, the number of actuators, and lowers maintenance difficulty and cost. Furthermore, the dynamic buffer roller actively adjusts its position based on tension detection data to compensate for changes in diaphragm length. The tension detection roller monitors the operating tension in real time and synchronously transmits the data to the buffer roller and swing roller control systems. The tension swing roller absorbs the instantaneous tension impact generated by equipment start-up, shutdown, or speed changes through mechanical oscillation, achieving coordinated operation of detection, compensation, and buffering functions to form a closed-loop tension control system. This effectively avoids the signal delay caused by discrete control in related technologies, enabling rapid response to tension changes and avoiding the adjustment lag caused by multi-level control in traditional solutions, thereby reducing the tensile deformation rate of the diaphragm during high-speed operation.

[0016] Furthermore, in the scheme of this application, after the diaphragm is drawn out from the two roll assemblies of the diaphragm unwinding mechanism, it reaches the stacking station after passing through six rollers. That is, the diaphragm conveying path sequentially passes through the first guide roller, the second guide roller, the dynamic buffer roller, the tension detection roller, the tension swing roller, the third guide roller, and the diaphragm swing roller before entering the stacking station. Among them, the dynamic buffer roller, the tension detection roller, and the tension swing roller are three functional rollers. Through the dynamic coordination of the three, they replace the redundant tension control system in related technologies. This not only achieves the same function as the unwinding and belt-carrying of the multi-roller system in related technologies, but also reduces the size of the unwinding device and lowers the assembly, adjustment, and maintenance costs.

[0017] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0018] The above and other objects, features and advantages of this application will become more apparent from the more detailed description of exemplary embodiments thereof in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments thereof.

[0019] Figure 1 This is a schematic diagram of the transmission path of the diaphragm unwinding device shown in the embodiments of this application; Figure 2 This is a schematic diagram of the tension control assembly of the diaphragm unwinding device shown in the embodiments of this application; Figure 3This is a perspective view of the diaphragm unwinding device shown in the embodiments of this application; Figure 4 This is a top view of the diaphragm unwinding device shown in the embodiments of this application; Figure 5 This is a front view of the diaphragm unwinding device shown in the embodiments of this application; Figure 6 This is a schematic diagram illustrating the cooperation between the diaphragm unwinding device and the stacking device in an embodiment of this application.

[0020] Reference numerals: 100, diaphragm unwinding device; 101, diaphragm; 110, diaphragm unwinding mechanism; 1101, unwinding drive; 1102, pushing drive; 1103, tape splicing drive mechanism; 111, roll assembly; 112, first guide roller; 120, tension control assembly; 121, dynamic buffer roller; 122, tension detection roller; 123, tension swing roller; 124, third guide roller; 130, diaphragm swing roller; 140, second guide roller; 150, correction drive; 160, unwinding support platform. Detailed Implementation

[0021] Preferred embodiments of the present application will now be described in more detail with reference to the accompanying drawings. While preferred embodiments of the present application are shown in the drawings, it should be understood that the present application may be implemented in various forms and should not be limited to the embodiments set forth 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 terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The singular forms “a,” “the,” and “the” used in this application and the appended claims are also 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 includes any or 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 one another. For example, without departing from the scope of this application, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0024] In the description of this application, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0025] Unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0026] In related technologies, current mainstream equipment generally adopts a complex roller system structure of 8-12 rollers. This lengthy multi-roller layout not only extends the transmission path, significantly increasing equipment space requirements, maintenance difficulty, and costs; but also, for ultra-thin diaphragms, the excessively long path and the contact points between the multiple rollers are prone to stress concentration, resulting in wavy lines and significantly increasing the film breakage rate. Furthermore, the separate control of the tension detection roller, buffer roller, and correction roller causes signal coordination lag, leading to increased diaphragm tension breakage and cumulative correction errors, resulting in a high tensile deformation rate of the ultra-thin diaphragm. To address these problems, this application provides a diaphragm unwinding device that can effectively reduce the physical length of the diaphragm transmission path, reduce the volume of the diaphragm unwinding device, and simultaneously reduce maintenance difficulty and costs.

[0027] The technical solutions of the embodiments of this application are described in detail below with reference to the accompanying drawings.

[0028] Figure 1 This is a schematic diagram of the transmission path of the diaphragm unwinding device shown in the embodiments of this application.

[0029] See Figure 1 This application provides a diaphragm unwinding device 100, including a tension control component 120 disposed on the diaphragm transport path. The tension control component 120 is located between the diaphragm unwinding mechanism 110 and the diaphragm swing roller 130. The tension control component 120 includes a dynamic buffer roller 121, a tension detection roller 122, and a tension swing roller 123. The dynamic buffer roller 121 is used for dynamic compensation of the length of the diaphragm 101. The tension detection roller 122 is used for real-time detection of the tension of the diaphragm 101, and the tension swing roller 123 is used to absorb sudden changes in the tension of the diaphragm 101.

[0030] The dynamic buffer roller 121 refers to a compensation mechanism that can move in the direction away from or near the tension detection roller 122. The direction away from or near the tension detection roller 122 can be along the thickness direction of the diaphragm 101 or perpendicular to the transmission plane of the diaphragm 101, or inclined relative to the thickness direction of the diaphragm 101. This application does not limit this.

[0031] The dynamic buffer roller 121 can be displaced using a linear drive device, compensating for tension fluctuations by changing the path length of the diaphragm 101. The tension detection roller 122 is a measuring unit equipped with a force sensor, which can specifically use a strain gauge or piezoelectric sensor to acquire tension data and provide feedback signals to the control system. The tension swing roller 123 is a buffer mechanism with swing freedom, which can specifically use a swing arm structure with a rotation fulcrum to achieve mechanical tension buffering, absorbing instantaneous tension changes through changes in the swing angle.

[0032] The solution in this application, on the one hand, shortens the traditional transmission path length through the integrated design of the dynamic buffer roller 121, tension detection roller 122, and tension swing roller 123, forming a compact layout in space. This reduces the volume of the diaphragm unwinding device, the number of actuators, and the maintenance difficulty and cost. Furthermore, the compact layout reduces the number of bends in the diaphragm 101, helping to reduce material stress damage. On the other hand, the dynamic buffer roller 121 actively adjusts its position based on tension detection data to compensate for changes in the length of the diaphragm 101. The tension detection roller 122 monitors the operating tension in real time and synchronously transmits the data to the buffer roller and swing roller control system. The tension roller 123 absorbs the instantaneous tension impact generated by equipment start-up, shutdown, or speed changes through mechanical oscillation, achieving coordinated operation of detection, compensation, and buffering functions to form a closed-loop tension control system. This effectively avoids the signal delay caused by discrete control in related technologies, enabling rapid response to tension changes and avoiding the adjustment lag caused by multi-level control in traditional solutions. This improves the stability of ultra-thin diaphragm operation and reduces the tensile deformation rate of the diaphragm during high-speed operation. In addition, the solution of this application, due to the simplification of the diaphragm transmission path and the reduction of the physical transmission path, is particularly suitable for the processing of 5-10μm ultra-thin diaphragms. The path abrupt change effectively suppresses the generation of wavy defects in ultra-thin diaphragms and reduces the risk of membrane breakage.

[0033] In some embodiments, the present application further includes a diaphragm swing roller 130 and a guide roller disposed between the tension control component 120 and the diaphragm swing roller 130. In this embodiment, the guide roller is a third guide roller 124. The diaphragm 101 passes sequentially through the tension detection roller 122, the tension swing roller 123, and the guide roller 124. The tension detection roller 122, the tension swing roller 123, and the third guide roller 124 are located at the three vertices of a virtual triangle. The third guide roller 124 is a cylindrical component used to guide the diaphragm 101's direction of travel. Specifically, it can be implemented using a metal roller or a carbon fiber roller, which is not limited in this application. The virtual triangle refers to the geometric shape formed by the axial projections of the tension detection roller 122, the tension swing roller 123, and the third guide roller 124. Specifically, the spatial layout of the three rollers can be achieved through three-dimensional coordinate positioning, and its side length ratio is optimized according to the tension distribution along the diaphragm 101's travel path.

[0034] Specifically, the diaphragm 101 is led out from the tension detection roller 122, passes around the tension swing roller 123, and then enters the diaphragm swing roller 130 through the third guide roller 124. The tension detection roller 122 detects the tension change of the diaphragm 101 in real time, the tension swing roller 123 absorbs the tension change through swinging, and the third guide roller 124 corrects the travel direction of the diaphragm 101. Specifically, the virtual triangle in this application is an asymmetrical virtual triangle. The asymmetrical triangular layout forms a stable mechanical transmission path, so that the tension detection, change absorption, and path guidance functions work synergistically in space. By shortening the transmission distance of the diaphragm 101 between the tension control component 120 and the diaphragm swing roller 130, the number of redundant guide rollers in the traditional multi-roller system structure is reduced, while avoiding local stress concentration of the diaphragm due to excessively long path.

[0035] In some embodiments, the number of rollers on the diaphragm transport path is less than or equal to six. In this embodiment, the rollers include, but are not limited to, dynamic buffer rollers, tension detection rollers, tension swing rollers, first guide rollers, second guide rollers, and third guide rollers, which are components used to guide the diaphragm's movement or direction. Related diaphragm unwinding devices 100 generally employ a linearly arranged multi-roller system (generally including 8-12 rollers) structure, resulting in complex assembly and adjustment processes and a large space requirement. This solution integrates roller functions through a triangular layout, solving the problem of difficult assembly, adjustment, and maintenance caused by the complex multi-roller system structure of related technologies. The triangular layout shortens the diaphragm transport path and reduces the number of rollers; for example, the number of rollers in this application is reduced from 8-12 in related technologies to less than or equal to six, simplifying the structure and diaphragm transport path. Simultaneously, the synergistic effect of the integrated three rollers improves the dynamic stability of the diaphragm during its movement, reducing the risk of stress concentration caused by path redundancy.

[0036] In some embodiments, the dynamic buffer roller 121 is driven by a first driving member to reciprocate along the tension detection roller 122 in the direction of approaching or moving away from it, for example, to achieve diaphragm buffering by pulling the diaphragm in the direction of approaching or moving away from the tension detection roller 122. The dynamic buffer roller 121 refers to a functional roller used to adjust the path length of the diaphragm 101, changing the effective path length of the diaphragm by displacement along the direction of approaching or moving away from the tension detection roller 122. The first driving member refers to an actuator that provides linear power, specifically a transmission assembly of a servo motor and a ball screw, capable of adjusting the travel of the buffer roller in real time according to the tension detection signal. The reciprocating movement along the direction of approaching or moving away from the tension detection roller 122 can be achieved by a guiding mechanism composed of a guide rail and a slider, ensuring a smooth transition of the diaphragm 101 along its path.

[0037] Specifically, when tension fluctuations occur during the movement of the diaphragm 101, the first driving component drives the buffer roller to move closer to or further away from the tension detection roller 122 based on the tension detection signal, achieving dynamic compensation by changing the physical length of the diaphragm path. For example, when the tension of the diaphragm 101 increases, the dynamic buffer roller 121 moves closer to the tension detection roller to shorten the diaphragm path and release the tension; when the tension decreases, the buffer roller moves further away from the tension detection roller to lengthen the path and absorb the relaxation. This linear motion mode avoids abrupt changes in the wrap angle, keeping the contact area of ​​the diaphragm 101 on the surface of the oscillating roller stable, thereby reducing the risk of stress concentration.

[0038] Therefore, this application can respond to instantaneous changes in diaphragm tension in real time, realizing the coordinated function of dynamic buffering and tension adjustment, and avoiding the signal transmission delay problem of traditional discrete control systems. The tension detection roller, dynamic buffer roller, and diaphragm swing roller 130 realize three-linkage closed-loop control, compressing the response delay to less than 50ms, which can quickly respond to abnormal diaphragm tension and significantly reduce diaphragm deformation rate and membrane breakage rate.

[0039] See Figure 2 In some embodiments, the tension swing roller 123 includes a swing arm and a swing roller disposed at one end of the swing arm. The end of the swing arm away from the swing roller is rotatably connected to the rotation center O. The swing arm is driven by a second driving member to swing around the rotation center O. The distance between the tension detection roller 122 and the swing roller of the tension swing roller 123 is greater than the distance between the swing roller and the second guide roller 123. The height of the swing roller of the tension swing roller 123 is greater than the height of the third guide roller 124. The diaphragm 101 covers an area of ​​more than 90° of the wrap angle of the swing roller of the tension swing roller 123. For example, it can be 95°, 100°, 110°, 115°, 120°, 125°, etc., but is not limited to these.

[0040] The swing arm is a single cantilever structure, which replaces the cross-shaped swing rollers in related technologies, simplifying mechanical complexity and reducing control difficulty and equipment cost. The height of the swing roller refers to the vertical position difference between the central axis of the swing roller and the central axis of the third guide roller 124. This can be achieved by adjusting the installation position of the swing roller or changing the height difference of the support structure, thereby creating an inclination angle in the diaphragm running path.

[0041] The coverage range of the wrap angle refers to the range of the central angle corresponding to the contact arc between the diaphragm 101 and the surface of the swing roller. Specifically, it can be achieved by increasing the diameter of the swing roller or adjusting the position of the dynamic buffer roller or the swing angle of the swing arm. The constraint effect on the movement of the diaphragm is enhanced by expanding the length of the contact arc.

[0042] In this embodiment, the diaphragm 101 forms an inclined running path between the tension swing roller 123 and the third guide roller 124. Since the swing roller height of the tension swing roller 123 is higher than that of the third guide roller 124, the contact arc length of the diaphragm 101 at the tension swing roller 123 increases with the increase of the wrap angle. When the wrap angle coverage exceeds 90°, for example 110°, the frictional contact area between the diaphragm 101 and the surface of the swing roller increases, and the lateral vibration energy is effectively dissipated through friction. By increasing the frictional contact area, the lateral vibration of the diaphragm 101 is suppressed, and the drift of the diaphragm 101 during high-speed operation is suppressed. At a speed of 80m / min, the amplitude is ≤0.3mm, and no additional damping roller is required. At the same time, the stress distribution area of ​​the diaphragm on the surface of the swing roller is expanded, and the phenomenon of local stress concentration is weakened, avoiding diaphragm stretching deformation or breakage due to excessive stress.

[0043] Compared with existing technologies, traditional horizontal multi-roller systems have an unwinding wrap angle of no more than 90°, resulting in insufficient contact area between the diaphragm 101 and the swing roller, necessitating the addition of damping rollers to suppress vibration. This solution optimizes the synergistic effect of the swing roller height and wrap angle parameters, achieving improved diaphragm operational stability through structural layout adjustments without the need for additional damping rollers. Through this technical solution, this application can suppress the lateral amplitude of the diaphragm during high-speed operation, reduce the risk of tensile deformation caused by stress concentration, and simultaneously reduce the number of equipment components (e.g., the number of rollers) and maintenance complexity.

[0044] See Figure 1 and Figure 6In some embodiments, the diaphragm 101 enters the stacking station of the subsequent stacking device 200 after passing through the diaphragm swing roller 130. The diaphragm swing roller 130 is configured to swing left and right at the stacking station in rhythm with the electrode transport, to provide a flat diaphragm substrate and recycle excess diaphragm. The left and right swing of the diaphragm swing roller 130 refers to the periodic movement of the roller along an axial direction perpendicular to the diaphragm's travel direction in the horizontal plane. This can be achieved using a linear motor, with the swing frequency set to synchronize with the electrode transport rhythm. Synchronization with the electrode transport rhythm means that the swing timing of the diaphragm swing roller 130 establishes a mechanical linkage with the electrode gripping and placement action. Specifically, the swing action can be triggered by an encoder signal, so that the diaphragm output and electrode transport are dynamically matched.

[0045] Specifically, when the electrode handling robot performs a gripping action, the diaphragm swing roller 130 swings in the first direction to release a preset length of flat diaphragm substrate. After the electrode is placed, the output roller swings in the opposite direction to reclaim any unused diaphragm allowance. This oscillating stroke retraction action achieves material rewinding by changing the contact wrap angle between the swing roller and the diaphragm, while simultaneously eliminating diaphragm slack caused by the intermittent electrode handling. The diaphragm swing roller 130 absorbs tension surges before entering the stacking station, ensuring that the diaphragm maintains a constant tension state during the swinging process, avoiding substrate wrinkles caused by tension fluctuations in traditional solutions.

[0046] This application achieves dynamic control of the diaphragm through synergistic effects of features. First, the design of the diaphragm entering the stacking station after passing through the diaphragm swing roller 130 utilizes the diaphragm swing roller 130's ability to absorb sudden tension changes, ensuring that the diaphragm has completed tension adjustment before entering the stacking station. This avoids tension fluctuations in the initial stage directly affecting the stacking accuracy and eliminates diaphragm wrinkles. Second, the left-right swing design of the diaphragm swing roller 130, synchronized with the electrode handling rhythm, achieves timing matching between diaphragm supply and electrode handling through mechanical linkage: the swing motion adjusts the diaphragm output position in real time to maintain substrate flatness, and actively eliminates diaphragm excess caused by intermittent electrode handling through a retraction action during the swing stroke. This dynamic retraction mechanism avoids diaphragm accumulation caused by traditional fixed paths and significantly reduces signal transmission delay by replacing traditional electronic control compensation with mechanical synchronization, thus maintaining diaphragm tension stability and positional accuracy even at high speeds.

[0047] See Figures 1 to 5In some embodiments, the present application further includes a web-correction system, which includes a web-correction sensor disposed at the diaphragm swing roller 130 and a web-correction drive 150 for driving the diaphragm unwinding mechanism 110. The web-correction drive 150 is used to drive the diaphragm unwinding mechanism 110 to move in the opposite direction to the offset of the diaphragm 101. The web-correction sensor is a detection device used to capture the lateral offset of the diaphragm 101, and can be implemented using a linear CCD or laser displacement sensor to obtain the edge position data of the diaphragm 101 in real time through non-contact measurement. The web-correction drive 150 is an actuator that drives the diaphragm unwinding mechanism 110 to move laterally, and can be implemented using a cylinder, linear motor, or ball screw module to compensate for the diaphragm offset through reverse displacement.

[0048] In this embodiment, the web-correction sensor is directly positioned on the diaphragm roller 130, enabling real-time monitoring of the diaphragm's actual position before entering the stacking station. When lateral displacement of the diaphragm is detected, the web-correction sensor transmits the deviation signal to the web-correction drive 150 via a high-speed communication link. The web-correction drive 150 then drives the diaphragm unwinding mechanism 110 to move in the opposite direction of the displacement, causing a reverse adjustment at the starting point of the transmission path, thereby correcting the trajectory deviation of the diaphragm during subsequent travel. Since the web-correction action acts directly on the diaphragm unwinding mechanism 110 rather than the intermediate roller system, the response lag caused by multi-stage transmission in traditional solutions is avoided. Simultaneously, the real-time linkage between the web-correction sensor and the web-correction drive forms a closed-loop control, ensuring that the calculation and execution of the web-correction amount are completed synchronously. Through the above technical solution, this application effectively avoids the error accumulation problem caused by signal transmission delay in traditional discrete web-correction systems, achieving source correction of diaphragm position deviation. The improved web-correction response speed significantly reduces the tensile deformation rate of the diaphragm under high-speed operation, while avoiding the risk of diaphragm wrinkling or breakage due to web-correction lag. The direct linkage between the correction sensor and the correction drive ensures real-time matching between the correction action and the detection result, improving the positional accuracy of the diaphragm at the entry of the stacking station.

[0049] In some embodiments, the diaphragm unwinding mechanism 110 includes two parallelly arranged roll assemblies 111, with an automatic tape-connecting mechanism between the two roll assemblies 111 for continuous switching of the diaphragm rolls. The two parallelly arranged roll assemblies 111 refer to two independent diaphragm rolls arranged in parallel within the unwinding device. Specifically, a dual-station material rack structure can be used, with a mechanical frame supporting the synchronous or alternating operation of the two roll assemblies 111. Specifically, the dual-station material rack is mounted on the unwinding support platform 160 and is movable relative to the unwinding support platform 160, for example, driven by a push-wind drive 1102, with the movement direction along the axial direction of the two roll assemblies. A correction drive 150 is provided between the dual-station material rack and the unwinding support platform 160. The correction drive 150 can drive the material racks of the two roll assemblies 111 to move independently in the axial direction based on the sensing signal from the correction sensor, thereby achieving diaphragm correction. (Continue to see...) Figure 1 , Figure 2 and Figure 6 In this embodiment, the guide roller 124 can be a third guide roller, and two first guide rollers 112 are also provided near the two material roll assemblies 111. The diaphragms 101 of the two material roll assemblies 111 enter the tension control assembly 120 after passing through their respective first guide rollers 112. In some embodiments, the tension control assembly 120 also includes a second guide roller 140, which is aligned vertically with the tension detection roller 122. The diaphragm 101 passes through the first guide roller 112, the third guide roller 124, and then the dynamic buffer roller 121. After passing through the dynamic buffer roller 121, it passes through the tension detection roller 122 and the tension swing roller 123, and then through the third guide roller 124 to reach the diaphragm swing roller 130. Finally, it is introduced into the stacking device 200 by the diaphragm swing roller 130.

[0050] In this application, the diaphragm 101, after being drawn out from the two roll assemblies 111 of the diaphragm unwinding mechanism, reaches the stacking station after passing through six rollers. Specifically, the diaphragm transport path sequentially passes through the first guide roller 112 → the second guide roller 140 → the dynamic buffer roller 121 → the tension detection roller 122 → the tension swing roller 123 → the third guide roller 124 → the diaphragm swing roller 130 before entering the stacking station of the stacking device 200. The redundant tension control system in related technologies is replaced by the dynamic coordination of three functional rollers (dynamic buffer roller 121, tension detection roller 122, and tension swing roller 123). The six rollers in this application achieve the same function as the 8-12 roller unwinding and conveying systems in related technologies, reducing the volume of the unwinding device by 30% and lowering assembly, adjustment, and maintenance costs by more than 40%.

[0051] An automatic tape splicing mechanism is a device used for automatically splicing new and old diaphragm rolls. Specifically, it can be implemented using a hot-melt tape splicing module or an adhesive tape bonding mechanism. A sensor detects the remaining amount in the roll assembly 111 and triggers the splicing action. In some embodiments, the automatic tape splicing mechanism is located between two diaphragm unwinding rollers and is connected to a tape splicing drive mechanism. The tape splicing drive mechanism is used to drive the automatic tape splicing mechanism back from the splicing station after the splicing is completed.

[0052] The automatic splicing mechanism achieves seamless connection between new and old diaphragms through automated control, eliminating downtime errors caused by manual operation. Specifically, when the diaphragm in one of the rolls 111 is about to run out, the automatic splicing mechanism obtains the remaining amount of diaphragm in roll 111 through a position sensor and starts the unwinding action of another roll 111. At this time, the two rolls 111 automatically bond or weld at the splicing station at their ends, respectively, maintaining the continuity of the diaphragm transport path. During this process, the unwinding speed of the two rolls 111 is synchronously controlled by the drive system to ensure that the diaphragm tension remains stable during splicing, avoiding tensile deformation caused by sudden speed changes. The automatic splicing mechanism adjusts the splicing pressure and temperature parameters in real time through a closed-loop control system to ensure the flatness and strength of the splicing area, thereby reducing material waste. Through the above technical solutions, this application solves the problem of low efficiency caused by the 100 roll change stop of the traditional diaphragm unwinding device, eliminates the risk of tension fluctuation caused by manual operation, and reduces the cutting loss of diaphragm material through the automated tape splicing process, thereby improving the continuity of the lithium battery manufacturing process and the material utilization rate.

[0053] In some embodiments, two roll assemblies 111 are respectively connected to two unwinding drives 1101, and a rangefinder is provided above the two roll assemblies 111. The rangefinder is used to detect the roll diameter of the two roll assemblies 111 in real time and feed it back to the speed control module of the unwinding drive 1101.

[0054] In this embodiment, the rangefinder is a non-contact detection device, specifically a laser rangefinder or an ultrasonic sensor. It calculates the change in the outer diameter of the roll material by emitting detection signals and receiving reflected signals. This device provides dynamic data input to the speed control module by monitoring the changes in the physical parameters of the roll material diameter in real time. The unwinding drive 1101 is a power device that drives the rotation of the roll assembly 111, specifically a servo motor or a variable frequency motor. It adjusts the output speed by receiving instructions from the speed control module. This device dynamically adjusts the unwinding linear speed to match the change in roll diameter. The speed control module is a data processing and instruction generation unit, specifically a PLC or an embedded controller. It calculates the current unwinding linear speed requirement and generates a drive signal by receiving real-time roll diameter data from the rangefinder. This device achieves real-time synchronization between the unwinding speed and the change in roll diameter through a closed-loop control mechanism.

[0055] Specifically, a rangefinder is installed above the roll assembly 111 to continuously collect real-time data on the outer diameter of the roll and transmit the data to the speed control module. The speed control module converts the roll diameter data into a required unwinding linear speed based on a preset algorithm, generates a corresponding drive signal, and sends it to the unwinding drive unit 1101. The unwinding drive unit 1101 adjusts its output rotation speed according to the received drive signal, ensuring that the unwinding linear speed of the roll assembly 111 is inversely proportional to the change in roll diameter, thereby maintaining a constant diaphragm output speed. As the roll diameter gradually decreases during the unwinding process, the rotation speed of the unwinding drive unit 1101 is synchronously increased to prevent diaphragm loosening or tension fluctuations caused by a decrease in linear speed.

[0056] Through the above technical solution, this application solves the problem of asynchronous unwinding speed and tension control caused by changes in roll diameter in traditional diaphragm unwinding mechanism 110, thus avoiding diaphragm stretching deformation or tension fluctuations. Real-time roll diameter detection and dynamic speed compensation ensure that the diaphragm maintains a constant linear speed output during unwinding, improving the stability of diaphragm conveying and the accuracy of tension control.

[0057] In some embodiments, the diaphragm unwinding device 100 further includes a first cleaning component and a second cleaning component disposed on the diaphragm transport path. The first cleaning component is located on both sides of the diaphragm travel path and is used to remove dust and impurities from the diaphragm surface. The second cleaning component is disposed adjacent to the diaphragm surface and is used to remove metallic impurities from the diaphragm surface. The first cleaning component refers to a cleaning mechanism symmetrically arranged on both sides along the diaphragm transport direction. Specifically, it can be a non-contact cleaning mechanism, such as an airflow nozzle, to avoid scratching the diaphragm. It removes non-conductive particles generated by environmental exposure or material friction by laterally covering the edge area of ​​the diaphragm surface. The second cleaning component refers to a cleaning device that maintains close contact with the diaphragm surface. Specifically, it can be implemented using an electrostatic adsorption device or a magnetic attraction mechanism, capturing metal debris or conductive particles attached to the diaphragm surface through physical contact or magnetic field action.

[0058] As the diaphragm travels along the transport path, the first cleaning component sweeps the diaphragm surface laterally using cleaning mechanisms on both sides. This mechanical contact or airflow impact removes dust and impurities distributed at the diaphragm's edges, preventing them from spreading towards the center. The second cleaning component, installed close to the diaphragm surface, employs a removal method tailored to the characteristics of metallic impurities. For example, it uses magnetic attraction to capture ferromagnetic particles or electrostatic adsorption to collect charged metal particles, thus specifically removing conductive impurities that could cause internal short circuits in the battery. The coordinated operation of the two components ensures that dust and metallic impurities are removed in stages during transport, avoiding the inefficiency of a single cleaning method for handling different types of impurities and minimizing interference with diaphragm tension during cleaning.

[0059] This application can effectively remove different types of impurities from the surface of the separator, avoid unevenness of the separator surface caused by dust accumulation, prevent metal impurities from puncturing the separator or causing internal short circuits in the battery, thereby improving the quality of the finished separator and the stability of equipment operation.

[0060] The diaphragm unwinding apparatus 100 of this application has been described above. Correspondingly, this application also provides a battery manufacturing apparatus.

[0061] See Figure 1 and Figure 6 The battery manufacturing equipment includes a separator unwinding device 100, a stacking device and a control device as described in the above embodiment. The separator unwinding device 100 is used to transfer the separator to the stacking device 200.

[0062] The stacking device 200 of this application refers to an electrode stacking device. After the diaphragm passes through the diaphragm swing roller 130 of the diaphragm unwinding device 100, it enters the stacking device. The diaphragm swing roller 130 of the diaphragm unwinding device 100 adjusts the diaphragm conveying amount by synchronizing the electrode handling rhythm, maintaining the flatness of the diaphragm and recovering excess material at the stacking station of the stacking device 200. The battery manufacturing equipment of this application integrates a separator unwinding device 100 with dynamic compensation, tension detection, and abrupt change absorption functions with a stacking device to construct a compact lithium battery manufacturing system. The separator unwinding device 100 achieves separator length compensation through a dynamic buffer roller 121, provides real-time tension data feedback through a tension detection roller 122, and absorbs tension abrupt changes through a tension swing roller 123, forming a three-linkage closed-loop control system. The stacking device maintains separator flatness and recovers excess material through a swing output roller that synchronizes with the electrode handling rhythm. This technical solution, through the integrated design of functional modules, shortens the separator transport path length and achieves tension balance through the coordinated control of various components. It also optimizes stress distribution, particularly for ultra-thin separators, effectively reducing the risk of tensile deformation and membrane breakage during operation.

[0063] The various embodiments of this application have been described above. These descriptions are exemplary and not exhaustive, nor are they 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 chosen to best explain the principles, practical application, or improvement of the technology in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A diaphragm unwinding device, characterized in that, include: A tension control component is disposed on the diaphragm transport path, the tension control component being located between the diaphragm unwinding mechanism and the diaphragm swing roller; The tension control component includes a dynamic buffer roller, a tension detection roller, and a tension swing roller. The dynamic buffer roller is driven by the first driving element to reciprocate along the direction of approaching or moving away from the tension detection roller, in order to achieve diaphragm buffering. The tension detection roller is used for real-time detection of diaphragm tension; The tension swing roller includes a swing arm and a swing roller disposed at one end of the swing arm. The end of the swing arm away from the swing roller is rotatably connected to a rotation center. The swing arm is driven by a second drive member to swing around the rotation center.

2. The diaphragm unwinding device according to claim 1, characterized in that: A first guide roller is also provided near the diaphragm unwinding mechanism. The diaphragm released by the diaphragm unwinding mechanism enters the tension control component after passing through the first guide roller. The tension control component also includes a second guide roller, which is aligned vertically with the tension detection roller. The dynamic buffer roller has a set distance from the tension detection roller or the second guide roller.

3. The diaphragm unwinding device according to claim 1, characterized in that: It also includes a diaphragm swing roller and a third guide roller disposed between the tension control component and the diaphragm swing roller. The third guide roller is used to guide the tension-adjusted diaphragm to the diaphragm swing roller. The diaphragm swing roller is configured to swing left and right at the stacking station in rhythm with the electrode transport, in order to provide a flat diaphragm substrate and recycle excess diaphragm.

4. The diaphragm unwinding device according to claim 3, characterized in that: The tension detection roller, the tension swing roller, and the third guide roller are arranged sequentially on the transmission path of the diaphragm; The distance between the tension detection roller and the swing roller is greater than the distance between the swing roller and the third guide roller, the height of the swing roller is greater than the height of the third guide roller, and the diaphragm covers an area of ​​more than 90° at the wrap angle of the swing roller.

5. The diaphragm unwinding device according to claim 4, characterized in that: The tension detection roller, the tension swing roller, and the third guide roller are located at the three vertices of a virtual triangle, which is an asymmetrical triangle.

6. The diaphragm unwinding device according to claim 1, characterized in that: It also includes a web-correction system, comprising a web-correction sensor disposed at the diaphragm swing roller, and a web-correction drive for driving the diaphragm unwinding mechanism; the web-correction sensor is signal-connected to the web-correction drive, and the web-correction drive is used to drive the diaphragm unwinding mechanism to move in the opposite direction of the diaphragm's offset.

7. The diaphragm unwinding apparatus of claim 1, wherein The diaphragm unwinding mechanism includes: The diaphragm unwinding mechanism includes two roll assemblies arranged in parallel, with an automatic tape-connecting mechanism between the two roll assemblies for continuous switching of the diaphragm roll material; wherein, the two roll assemblies are connected to an unwinding drive, and a rangefinder is provided above the two roll assemblies, the rangefinder being used to detect the roll diameter of the two roll assemblies in real time and feed it back to the speed control module of the unwinding drive.

8. The diaphragm unwinding device according to claim 7, characterized in that, A rangefinder is provided above the material roll assembly. The rangefinder is used to detect the roll diameter of the two material roll assemblies in real time and feed it back to the speed control module of the unwinding drive.

9. The diaphragm unwinding device according to any one of claims 1-8, characterized in that: The number of rollers on the diaphragm transport path is less than or equal to six.

10. A battery manufacturing apparatus, characterized by comprising: include: The diaphragm unwinding apparatus as described in any one of claims 1-9; as well as A stacking device, wherein the diaphragm unwinding device is used to transfer the diaphragm to the stacking device.

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