A lithium battery separator extraction system

Abstract

The present application relates to lithium battery diaphragm production technical field, disclose a kind of lithium battery diaphragm extraction system, the system uses multiple-cavity series extraction tank body, inside setting guide vane separates tank body into multiple continuous chambers, guiding extraction agent ordered flow, reduce flow field dead angle;Equipped with diaphragm conveying system, by active drive roller and multiple groups of driven guide roller cooperation, diaphragm is S-shaped path in each chamber, prolongs contact time;While integrating tension control mechanism, including floating roller group, tension sensor and controller, realize to diaphragm tension in running process Real-time monitoring and dynamic adjustment. Overall structure effectively improves extraction uniformity and process stability, prevent diaphragm damage, improve product quality and production efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of lithium battery separator production, and particularly relates to a lithium battery separator extraction system. BACKGROUND

[0002] The lithium battery separator is one of the key inner components of the lithium ion battery, and its performance directly affects the capacity, cycle life and safety of the battery. The wet process is the mainstream method for preparing high-performance microporous separators. In this process, the pore-forming agent (such as white oil) is first mixed and melted with the polyolefin resin to form a base film, and then the pore-forming agent in the base film is removed through an extraction process to form a uniform microporous structure. The extraction system is the core equipment in the wet process separator production line, and its performance directly determines the key indicators of the separator, such as porosity, air permeability and thickness uniformity. At present, the commonly used extraction system in the industry usually includes a tank containing an extraction agent, and a conveying system guiding the separator to pass through the tank. However, the extraction tank of the traditional extraction system is usually a simple single-chamber structure, and lacks effective fluid guiding mechanisms inside. Because the extraction agent has poor flowability in the tank, it is easy to produce vortex dead angles, resulting in inconsistent contact efficiency and contact time of the different parts of the separator with the fresh extraction agent. This will cause uneven residual of the pore-forming agent, and finally form a separator with macroscopic porosity difference, affecting the consistency of the battery performance. Moreover, the separator will become soft and its strength will decrease due to swelling in the extraction liquid. The traditional conveying system can only provide basic traction, and lacks precise online tension monitoring and feedback mechanisms. If the tension is too small, it will cause the separator to relax and wrinkle, and cause damage to the surface due to friction with the guide roller. If the tension is too large, it may stretch the separator, causing deformation or even rupture of its micro-porous structure. SUMMARY

[0003] The present application discloses a lithium battery separator extraction system to solve the technical problems of low extraction efficiency and quality of the existing separator extraction system in the related art.

[0004] To solve the above problems, the present application adopts the following technical solutions:

[0005] The present application provides a lithium battery separator extraction system, which comprises an extraction tank, a separator conveying system, a tension control mechanism and a main frame. The extraction tank and the tension control mechanism are installed on the main frame. A plurality of flow guide plates are fixedly installed inside the extraction tank along its length direction, and the flow guide plates divide the inner cavity of the extraction tank into a plurality of series-connected extraction chambers. The separator conveying system comprises at least one driving roller and a plurality of driven guide rollers. The driving roller and the driven guide rollers are installed on the inlet side, the outlet side of the extraction tank and each extraction chamber through a bearing seat and a support. The tension control mechanism comprises a tension sensor, a floating roller group and a controller. The tension sensor and the floating roller group are fixedly installed on the outside of the inlet and the outlet of the extraction tank.

[0006] Preferably, a gap for the diaphragm to pass exists between the upper edge of the flow guide plate and the top wall of the extraction tank body, and the plane where the flow guide plate is located forms an acute angle with the running direction of the diaphragm; and / or, a gap for the diaphragm to pass exists between the lower edge of the flow guide plate and the bottom wall of the extraction tank body, and the plane where the flow guide plate is located forms an acute angle with the running direction of the diaphragm.

[0007] Preferably, a cavity is formed in the flow guide plate, and a plurality of ultrasonic transducers are embedded in the cavity.

[0008] Preferably, the floating roller group is composed of one floating roller, two linear guide rails and two pressure springs; the two linear guide rails are vertically fixed on the main frame, the two ends of the floating roller are connected with the linear guide rails through linear bearings to form a sliding pair, and the two pressure springs are sleeved on the linear guide rails and located between the linear guide rails and the floating roller.

[0009] Preferably, the controller is a PLC or a microprocessor, which is electrically connected with the tension sensor through a signal cable and is electrically connected with the driving motor of the diaphragm conveying system through a power cable.

[0010] Preferably, the automatic deviation rectifying device is composed of an edge position sensor and a deviation rectifying mechanism, the edge position sensor is fixed outside the inlet and the outlet of the extraction tank body, and the deviation rectifying mechanism comprises an output member and a deviation rectifying roller, one end of the output member is hinged to the main frame, and the other end thereof is hinged to the deviation rectifying roller.

[0011] Preferably, the output member is a pneumatic swing cylinder, the output shaft of the pneumatic swing cylinder is fixedly connected with one end of a swing arm through a key, and the other end of the swing arm is hinged to the deviation rectifying roller through a pin shaft.

[0012] Preferably, at least one porous support plate is fixedly installed on the bottom of the extraction tank body through an angle steel support frame, the upper surface of the porous support plate is a smooth arc surface which is convex upward, and the highest point of the arc surface is located at the same horizontal height as the bottom tangent point of the driven guide roller.

[0013] Preferably, the roller body surface of the floating roller is coated with an abrasive rubber layer.

[0014] Preferably, the driven guide rollers are arranged in an up-and-down staggered manner in the extraction tank body, and the number of the driven guide rollers located in the same extraction tank body is three, two of which are installed at the lower part and one of which is installed at the upper part, so that the diaphragm passes through the driven guide rollers in an S-shaped path.

[0015] The technical scheme adopted by the present application can achieve the following beneficial effects:

[0016] The present application sets up a multi-cavity series extraction tank structure, arranges multiple flow guide plates in the length direction in the tank body, divides the inner cavity into multiple continuous flow extraction chambers, effectively guides the directional flow of the extractant, avoids the vortex dead angle problem existing in the traditional single-cavity tank body, significantly improves the uniformity and update frequency of the liquid flushing on the surface of the diaphragm, thereby improving the mass transfer efficiency and removal consistency of the pore-forming agent, cooperates with the upper and lower staggered arrangement of the driven guide rollers, makes the diaphragm pass through in an S-shaped path in each chamber, greatly prolongs the immersion stroke and reaction time, and enhances the extraction depth; moreover, the closed-loop tension control system composed of a tension sensor, a floating roller group and a controller is introduced, which can detect and feedback adjust the dynamic tension of the diaphragm in the swelling state in real time, prevent the wrinkling, stretching deformation and even rupture phenomenon caused by tension fluctuation, and ensure the process stability under high-speed running conditions. In addition, the entire system integrates an automatic deviation correction device, a multi-hole support plate and a built-in ultrasonic excitation function and other auxiliary structures, which not only improves the equipment automation level and operation reliability, but also optimizes the extraction environment from multiple dimensions such as physical support, horizontal positioning and microscopic mass transfer; therefore, the present technical solution realizes the fine control of the whole process of the lithium battery diaphragm extraction process, significantly improves the thickness uniformity, porosity consistency and mechanical integrity of the diaphragm, and further helps to improve the overall performance, safety and cycle life of the lithium battery. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0018] Figure 1 is a schematic diagram of a lithium battery diaphragm extraction system disclosed in some embodiments of the present application.

[0019] In the drawings:

[0020] 1, lithium battery diaphragm extraction system;

[0021] 10, extraction tank body; 11, diaphragm conveying system; 12, tension control mechanism; 13, automatic deviation correction device; 14, main frame;

[0022] 100, flow guide plate; 101, multi-hole support plate; 110, driving roller; 111, driven guide roller; 120, tension sensor; 121, floating roller group; 130, edge position sensor; 131, deviation correction execution mechanism;

[0023] 1000, ultrasonic transducer; 1210, floating roller; 1211, linear guide rail; 1212, pressure spring; 1310, output member; 1311, deviation rectifying roller. DETAILED DESCRIPTION

[0024] In order to make the objects, technical solutions and advantages of the present application clearer, the technical solutions of the present application will be described in detail below. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work belong to the scope of protection of the present application.

[0025] The terms "first", "second", and the like in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. are generally a class, not limited to the number of objects, for example, the first object can be one or more. In addition, "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / ", generally indicates that the front and rear associated objects are in an "or" relationship.

[0026] The existing lithium battery separator extraction system mostly adopts a single-chamber tank structure, which lacks effective fluid guiding mechanism inside, resulting in uneven flow of extractant in the tank, easy to form vortex dead angle, so that different areas of the separator contact with fresh extractant at different efficiencies, causing uneven removal of pore-forming agent, affecting the consistency of the final separator porosity; in addition, the traditional conveying system lacks real-time monitoring and control ability of the tension of the separator, the strength of the separator decreases in the swelling state, and the problems of relaxation wrinkles or excessive stretching are easy to occur, thereby affecting the product quality and production stability.

[0027] The present application will be described in detail below by combining the accompanying drawings Figure 1 with specific embodiments and their application scenarios.

[0028] The lithium battery separator extraction system 1 provided by the embodiment of the present application comprises an extraction tank body 10, a separator conveying system 11, a tension control mechanism 12 and a main frame 14, the extraction tank body 10 and the tension control mechanism 12 are installed on the main frame 14, a plurality of flow guide plates 100 are fixedly installed inside the extraction tank body 10 along the length direction of the extraction tank body 10, the flow guide plates 100 divide the inner cavity of the extraction tank body 10 into a plurality of extraction chambers connected in series; the separator conveying system 11 comprises at least one driving roller 110 and a plurality of driven guide rollers 111, the driving roller 110 and the driven guide rollers 111 are installed on the inlet side, the outlet side of the extraction tank body 10 and each extraction chamber through bearing seats and supports; the tension control mechanism 12 comprises a tension sensor 120, a floating roller group 121 and a controller, the tension sensor 120 and the floating roller group 121 are fixedly installed on the outside of the inlet and the outlet of the extraction tank body 10.

[0029] Specifically, the extraction tank body 10 is made of stainless steel material, has good corrosion resistance and mechanical strength, and has a cuboid structure as a whole for accommodating an extractant; five vertically arranged flow guide plates 100 are arranged at intervals along the length direction of the extraction tank body 10 inside the extraction tank body 10, the flow guide plates 100 are fixed on the side wall of the tank body by welding, and divide the whole inner cavity into six extraction chambers connected with each other; such a multi-chamber series connection structure can prolong the residence time of the separator in the extraction liquid, guide the directional flow of the extractant, and reduce the dead zone. The driving roller 110 of the separator conveying system 11 provides stable traction power; the driving roller 110 is connected with a variable frequency speed regulation motor through a shaft coupling to realize stepless speed regulation control. The plurality of driven guide rollers 111 are distributed in each extraction chamber and are made of aluminum alloy material, which is light in weight and corrosion resistant, and the two ends thereof are assembled on the supports fixed on the side wall of the tank body through rolling bearings to ensure flexible rotation. The tension sensor 120 in the tension control mechanism 12 is installed on the outside of the inlet and the outlet for real-time acquisition of the tension signal in the running process of the separator; the floating roller group 121 realizes up and down floating through a sliding pair structure, and the displacement change thereof reflects the tension fluctuation; the controller is a PLC module, receives the feedback signal from the tension sensor 120 and adjusts the rotating speed of the driving motor, so as to close-loop control the tension stability of the whole line.

[0030] Specifically, in operation, the lithium battery separator enters from the inlet of the extraction tank body 10, passes through each extraction chamber in turn, and travels along a predetermined path under the driving of the driving roller 110. Due to the presence of the flow guide plates 100, the extractant forms an orderly flow in each chamber, improving the mass transfer efficiency; at the same time, the tension sensor 120 continuously monitors the tension value of the separator and transmits the data to the controller, when the tension deviates from the set threshold value, the controller automatically adjusts the output rotating speed of the driving motor, so as to dynamically compensate the tension fluctuation and maintain the stable running of the separator.

[0031] It can be understood that by setting a multi-chamber structure matched with a tension closed-loop control system, the uniformity of the stress on the diaphragm and the process stability during the extraction process are significantly improved, the problems of wrinkling and rupture caused by out-of-control tension are effectively avoided, the consistency of the diaphragm thickness and the uniformity of the micro-pore distribution are improved, and thus the safety and the cycle performance of the battery are improved.

[0032] Further, a gap for the diaphragm to pass through exists between the upper edge of the flow guide plate 100 and the top wall of the extraction tank body 10, and the plane where the flow guide plate 100 is located forms an acute angle with the advancing direction of the diaphragm; and / or, a gap for the diaphragm to pass through exists between the lower edge of the flow guide plate 100 and the bottom wall of the extraction tank body 10, and the plane where the flow guide plate 100 is located forms an acute angle with the advancing direction of the diaphragm.

[0033] Specifically, in the embodiment, a gap for the diaphragm to pass through exists between the upper edge of the flow guide plate 100 and the top wall of the extraction tank body 10, and the plane where the flow guide plate 100 is located forms an acute angle with the advancing direction of the diaphragm, and the angle is 45°.

[0034] Specifically, the obliquely arranged flow guide plate 100 makes the diaphragm in a gradual transition state when passing through the gap, reduces the local bending curvature, and reduces the risk of stress concentration; at the same time, the extractant is forced to change the flow direction when flowing through the inclined flow guide plate 100, forming a diagonal upward or downward scouring flow state, which helps to flush away the residual pore-forming agent attached to the surface of the diaphragm, and improves the extraction efficiency.

[0035] It can be understood that this structure design not only guarantees the smoothness of the diaphragm operation, but also optimizes the flow path of the extraction liquid, reduces the flow dead zone, enhances the mass transfer effect, is conducive to realizing a more thorough and uniform extraction process, and improves the cleanliness of the diaphragm and the consistency of the pore structure.

[0036] Further, a cavity is formed in the flow guide plate 100, and a plurality of ultrasonic transducers 1000 are sealingly embedded in the cavity.

[0037] Specifically, a plurality of ultrasonic transducers 1000 are uniformly embedded in the cavity, each transducer is composed of a piezoelectric ceramic sheet and a metal shell, and the center frequency is 40 kHz; when the system is running, the ultrasonic generator supplies power to the transducer to generate high-frequency mechanical vibration in the flow guide plate 100, and these vibrations are transmitted to the surrounding extraction liquid through the flow guide plate 100, causing cavitation effect and micro-turbulence phenomenon, destroying the adsorption balance of the pore-forming agent in the micro-pore, accelerating its diffusion from the inside of the diaphragm to the solution body, and thus strengthening the extraction mass transfer process.

[0038] It can be understood that the built-in ultrasonic vibration device significantly improves the extraction rate and cleanliness, especially for deep extraction of thick or high crystallinity diaphragms, shortens the process cycle, reduces energy consumption, and avoids the problem of equipment complication caused by additional external ultrasonic tank.

[0039] Further, the floating roller set 121 is composed of one floating roller 1210, two linear guides 1211 and two pressure springs 1212; the two linear guides 1211 are vertically fixed on the main frame 14, the two ends of the floating roller 1210 are connected with the linear guides 1211 through linear bearings to form a sliding pair, and the two pressure springs 1212 are sleeved on the linear guides 1211 and located between the linear guides 1211 and the top plate of the floating roller 1210.

[0040] Specifically, when the diaphragm tension changes, the floating roller 1210 moves up and down, and the displacement is transmitted along the guide through the linear bearing, and the pressure spring 1212 provides a restoring force, so that the system has a certain buffering capacity and tension self-adaptive adjustment function; the tension sensor 120 senses the position change of the floating roller 1210 in real time and converts it into an electrical signal to the controller to realize closed-loop feedback control of tension.

[0041] It can be understood that this structure realizes high sensitivity detection and flexible adjustment of diaphragm tension, effectively absorbs instantaneous impact load in the running process, prevents tension from suddenly changing to cause diaphragm breakage or wrinkles, and improves the stability and reliability of system operation.

[0042] Further, the controller is a PLC or a microprocessor, which is electrically connected with the tension sensor 120 through a signal cable and electrically connected with the driving motor of the diaphragm conveying system 11 through a power cable.

[0043] Specifically, the controller adopts a Siemens S7-1200 series PLC module, has an analog input / output interface, can receive a standard 4-20mA current signal from the tension sensor 120 through a shielded twisted pair, and send the processed control instruction to the frequency converter in the form of pulse width modulation (PWM), and then adjust the speed of the driving motor. The PLC internally presets a PID control algorithm program with a sampling period of 100ms, which can automatically adjust the output frequency according to the real-time tension deviation to realize accurate speed compensation. The system is also equipped with a touch screen human-machine interface, through which the operator can set the target tension value, alarm threshold and operation mode.

[0044] It can be understood that the controller continuously acquires the data of the tension sensor 120, calculates the error after comparing with the set value, generates a correction signal by using a PID algorithm, controls the driving motor to speed up or slow down operation, so as to dynamically maintain the diaphragm tension in the set range, and form a closed loop control circuit; the high-performance PLC is used as the core controller, the automation level and control accuracy of the system are improved, the real-time and stable regulation of the tension is realized, the process consistency under the high-speed running condition is ensured, and the product yield and production efficiency are improved.

[0045] Further, the lithium battery diaphragm extraction system 1 provided by the application further comprises an automatic deviation rectification device 13, the automatic deviation rectification device 13 is composed of an edge position sensor 130 and a deviation rectification execution mechanism 131, the edge position sensor 130 is fixed to the outside of the inlet and the outside of the outlet of the extraction tank body 10 through a sensor support; the deviation rectification execution mechanism 131 comprises an output member 1310 and a deviation rectification roller 1311, one end of the output member 1310 is hinged to the main frame 14, and the other end of the output member 1310 is hinged to the deviation rectification roller 1311.

[0046] Specifically, when the edge position sensor 130 detects that the diaphragm edge deviates from the set track, the controller judges the deviation direction and starts the corresponding electromagnetic valve, the output member 1310 drives the pneumatic cylinder to extend or retract, pushes the deviation rectification roller 1311 to tilt, changes the local guide angle, forces the diaphragm to move in the opposite direction, and restores to the central position until the central position is restored; it can be understood that the automatic deviation rectification device 13 can quickly respond to the deviation trend of the diaphragm, realize millisecond-level dynamic correction, effectively prevent edge damage and jamming failure, and improve the continuity and safety of equipment operation.

[0047] Further, the output member 1310 is a pneumatic swing cylinder, the output shaft of the pneumatic swing cylinder is fixedly connected to one end of a swing arm through a key, and the other end of the swing arm is hinged to the deviation rectification roller 1311 through a pin shaft.

[0048] It can be understood that when the control system issues a deviation rectification instruction, the pneumatic swing cylinder drives the output shaft to rotate, drives the swing arm to swing, and then pulls or pushes the bearing seat of the deviation rectification roller 1311, so that the bearing seat rotates around the fulcrum, changes the spatial posture of the deviation rectification roller 1311, adjusts the running direction of the diaphragm, and realizes accurate deviation rectification; the pneumatic swing cylinder directly outputs rotary motion, eliminates the intermediate conversion mechanism, simplifies the mechanical structure, improves the response speed and transmission efficiency, and reduces the maintenance cost and failure rate.

[0049] Further, at least one perforated support plate 101 is fixedly installed on the bottom of the extraction tank body 10 through an angle steel support frame, the upper surface of the perforated support plate is a smooth arc surface that protrudes upward, and the highest point of the arc surface and the bottom tangent point of the driven guide roller 111 are located at the same horizontal height.

[0050] Specifically, a set of support frames are welded at the central area of the bottom of the extraction tank body 10, and a porous support plate 101 is fixedly installed on the support frames; the support plate is formed by stamping and drawing a 304 stainless steel plate through a mold, has an overall arc shape, and has a plurality of circular through holes with a diameter of φ5mm uniformly distributed on the surface, which provides physical support without affecting the flow of the extractant; the highest point of the top of the support plate is at the same level as the lowest point of the adjacent driven guide roller 111, so as to ensure that the diaphragm smoothly transitions above the support plate and does not generate additional bending stress; in actual application, the number of the porous support plate 101 can be increased to two or more, and the arc shape can be designed as a parabolic shape or an elliptical shape, which are not limited in the embodiments of the present application.

[0051] As can be understood, when the diaphragm passes above the support plate, the lower part of the diaphragm is lifted by the continuous arc surface, avoiding local sinking due to the difference in self-weight or liquid buoyancy, and maintaining the overall flatness; at the same time, the extractant can flow freely through the holes, maintaining a good mass transfer environment; the porous support plate 101 effectively prevents the deformation and wall sticking of the diaphragm in the liquid lower section, improves the operation stability, and balances the support function and fluid flow, which helps to obtain more uniform extraction effect.

[0052] Further, the roller body surface of the floating roller 1210 is coated with an abrasive rubber layer.

[0053] As can be understood, the abrasive rubber layer increases the friction coefficient between the floating roller 1210 and the diaphragm, and still maintains good gripping force in a wet extraction environment, prevents relative sliding, ensures that the measured value of the tension sensor 120 truly reflects the actual tension state, effectively avoids the tension measurement error and traction failure caused by slipping, improves the accuracy and reliability of the tension control mechanism 12, and ensures the stable conveying of the diaphragm.

[0054] Further, the driven guide rollers 111 are arranged in an up-down staggered manner in the extraction tank body 10, and the number of the driven guide rollers 111 located in the same extraction tank body 10 is three, of which two are installed at the lower part and one is installed at the upper part, so that the diaphragm passes through the driven guide rollers 111 in an S-shaped path.

[0055] Specifically, three driven guide rollers 111 are arranged in the extraction tank body 10: two are located in the upper half region of the chamber, and one is located in the lower half region, and the three are distributed in a triangular shape, so that the diaphragm passes around in an "S" shape from top to bottom and then upward. The guide rollers are installed on the adjustable supports on the side wall of the tank body through a shaft bearing with a seat, the supports are provided with a scale ruler and a locking nut, so as to facilitate the adjustment of the roller height and alignment. The diaphragm completes two reversals in each chamber, the total immersion length is increased, and the contact time with the extractant is significantly prolonged. In actual application, the S-shaped winding method can be expanded to a snake-shaped path with more roller combinations, and the number and arrangement of the guide rollers can be adjusted according to process needs, which are not limited in the embodiments of the present application.

[0056] It can be understood that the diaphragm passes between the chambers in an S-shaped path, increasing its effective travel and residence time in the extraction liquid, while promoting the formation of alternating flushing of the liquid on the diaphragm surface, improving the mass transfer efficiency; at the same time, by optimizing the layout of the guide roller, the contact area and action time of the diaphragm and the extractant are greatly improved, which is conducive to realizing more thorough removal of the pore-forming agent, improving the extraction uniformity and efficiency, and enhancing the adaptability of the system to different line speeds.

[0057] It should be noted that in this document, the terms "comprise", "comprising", or any other variant thereof are intended to cover non-exclusive inclusions, so that processes, methods, articles, or apparatuses that include a series of elements not only include those elements, but also include other elements not expressly listed, or inherent to such processes, methods, articles, or apparatuses. Without more limitations, the element defined by the statement "comprising a" does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes the element.

[0058] In addition, it should be noted that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, but can also include performing functions in a substantially simultaneous manner or in reverse order according to the functions involved, for example, the described method can be performed in an order different from that described, and various steps can also be added, omitted, or combined. In addition, the features described with reference to certain examples can be combined in other examples.

[0059] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto, and any skilled person in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A lithium battery separator extraction system, characterized in that, It includes an extraction tank, a diaphragm conveying system, a tension control mechanism, and a main frame, wherein the extraction tank and the tension control mechanism are mounted on the main frame; Multiple guide plates are fixedly installed along the length of the extraction tank. The guide plates divide the inner cavity of the extraction tank into multiple extraction chambers connected in series. There is a gap between the upper edge of the guide plate and the top wall of the extraction tank for the diaphragm to pass through, and the plane of the guide plate forms an acute angle with the direction of travel of the diaphragm; and / or, there is a gap between the lower edge of the guide plate and the bottom wall of the extraction tank for the diaphragm to pass through, and the plane of the guide plate forms an acute angle with the direction of travel of the diaphragm. The guide plate has a cavity inside, and multiple ultrasonic transducers are sealed and embedded in the cavity; The diaphragm conveying system includes at least one active drive roller and multiple driven guide rollers, which are mounted on the inlet side, outlet side, and each of the extraction chambers of the extraction tank via bearing seats and brackets. The tension control mechanism includes a tension sensor, a floating roller assembly, and a controller; At least one porous support plate is fixedly installed at the bottom of the extraction tank by an angle steel support frame. The upper surface of the porous support plate is a smooth arc surface that convexes upward, and the highest point of the arc surface is at the same horizontal height as the bottom tangent point of the driven guide roller.

2. The lithium battery separator extraction system according to claim 1, characterized in that, The floating roller assembly consists of a floating roller, two linear guide rails, and two pressure springs. The two linear guide rails are vertically fixed to the main frame. The two ends of the floating roller form a sliding pair with the linear guide rails through linear bearings. The two pressure springs are sleeved on the linear guide rails and located between the linear guide rails and the floating roller.

3. The lithium battery separator extraction system according to claim 1, characterized in that, The controller is a PLC or microprocessor, which is electrically connected to the tension sensor via a signal cable and electrically connected to the drive motor of the diaphragm conveying system via a power cable.

4. The lithium battery separator extraction system according to claim 1, characterized in that, It also includes an automatic correction device, which consists of an edge position sensor and a correction actuator. The edge position sensor is fixed to the outside of the inlet and the outside of the outlet of the extraction tank. The correction actuator includes an output component and a correction roller. One end of the output component is hinged to the main frame, and the other end is hinged to the correction roller.

5. The lithium battery separator extraction system according to claim 4, characterized in that, The output component is a pneumatic swing cylinder, whose output shaft is fixedly connected to one end of a swing arm via a flat key, and the other end of the swing arm is hinged to the correction roller via a pin.

6. The lithium battery separator extraction system according to claim 2, characterized in that, The surface of the floating roller is covered with a wear-increasing rubber layer.

7. The lithium battery separator extraction system according to claim 1, characterized in that, The driven guide rollers are arranged in an alternating pattern within the extraction tank, and there are three driven guide rollers located within the same extraction tank, with two installed at the bottom and one at the top, so that the diaphragm passes around the driven guide rollers in an S-shaped path.

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