Lithium battery diaphragm extraction device

Abstract

A lithium battery diaphragm extraction device belongs to the technical field of diaphragm production devices. The lithium battery diaphragm extraction device comprises an extraction tank, and a baffle is arranged in the extraction tank. The space in the extraction tank is separated by the baffle plate, so that extraction cavities are formed on two sides of the baffle plate; at least one end, close to the side wall of the extraction tank, of the top of the baffle is provided with a first overflow port, an overflow channel is further arranged in the baffle and perpendicularly penetrates through the baffle, an inlet of the overflow channel is located in the middle of the top of the baffle, and an outlet of the overflow channel is located below the inlet of the overflow channel. When the lithium battery diaphragm extraction device is used for carrying out an extraction process on the diaphragm, fluid in the extraction cavity overflows through the first overflow port and the overflow channel which are arranged at the baffle plate, so that extracted pore-forming agents such as paraffin oil can be fully separated from extract liquor, and the extraction quality is further improved.

Description

Technical Field

[0001] The present application relates to the technical field of diaphragm production devices, and in particular to a lithium battery diaphragm extraction device. Background Art

[0002] As global temperatures rise, the international community has increasingly stringent requirements for the development of the new energy industry. As the diaphragm industry has taken off rapidly, the global demand for diaphragms continues to expand.

[0003] At present, the preparation process of lithium-ion battery separators is mainly divided into two types: dry process (lamellar separation method) and wet process (thermal phase separation method). Because the wet process can better control the pore size, distribution and porosity, it is generally used to manufacture high-end separators. In the production process of wet separators, a high-boiling point, low-volatile solvent is required as a pore-forming agent. The commonly used pore-forming agent is paraffin oil, and a low-boiling point, volatile extractant is used in the extraction process to elute it, so that the separator forms micropores.

[0004] Dichloromethane is widely used as an extractant in the production process of wet-process lithium-ion battery separators due to its low boiling point, high volatility and low toxicity. However, the current extraction device easily leaves the pore-forming agent on the separator, resulting in defects such as water stains, wrinkles, oil stains, and bright spots on the separator. Therefore, the extraction device needs to be further optimized. Utility Model Content

[0005] Based on the above-mentioned deficiencies, the present application provides a lithium battery diaphragm extraction device to improve the problem of poor extraction quality in the related art.

[0006] This application is implemented as follows:

[0007] The example of the present application provides a lithium battery diaphragm extraction device, including an extraction tank, in which a baffle is arranged, the baffle separates the space in the extraction tank to form an extraction chamber on both sides of the baffle; a first overflow port is arranged at at least one end of the top of the baffle close to the side wall of the extraction tank, and an overflow channel is also arranged inside the baffle, the overflow channel vertically passes through the baffle, the inlet of the overflow channel is located in the middle of the top of the baffle, and the outlet of the overflow channel is located below the inlet.

[0008] In the above implementation process, a baffle is arranged in the extraction tank to separate the space in the extraction tank to form extraction chambers on both sides of the baffle, and a first overflow port is arranged at one end of the top of the baffle close to the side wall of the extraction tank, so that the liquid in the extraction chamber on one side of the baffle can overflow into the extraction chamber on the other side of the baffle through the first overflow port, so that the pore-forming agent located on the surface extracted from the extraction chamber on one side of the baffle overflows into the other extraction chamber, thereby reducing the influence of the extracted pore-forming agent remaining in the extraction chamber on the concentration of the extract, and reducing the probability that the pore-forming agent affects the quality of the diaphragm as the diaphragm moves.

[0009] In addition, an overflow channel is provided inside the baffle, and the overflow channel vertically penetrates the baffle, the inlet of the overflow channel is located in the middle of the top of the baffle, and the outlet of the overflow channel is located below the inlet of the overflow channel. During the extraction process, the liquid in the extraction chamber on one side of the baffle corresponding to the middle of the baffle can flow into the overflow channel from the inlet at the top of the baffle, flow vertically in the overflow channel, and overflow from the outlet below to the extraction chamber on the other side of the baffle, which not only enables the extraction liquid at the bottom or middle part of the extraction chamber to flow more fully, but also avoids the accumulation of pore-forming agents in the middle of the baffle, so as to improve the extraction quality.

[0010] In an optional embodiment, the height of the outlet location does not exceed half the height of the baffle;

[0011] Alternatively, the outlet is located at the bottom end of the baffle.

[0012] In the above implementation process, the height of the outlet of the overflow channel does not exceed half of the height of the baffle or is located at the bottom end of the baffle, so that the liquid in the extraction chamber on one side of the baffle can flow into the overflow channel from the top of the baffle, and then flow into the extraction chamber on the other side from the bottom or middle of the baffle, so that the extraction liquid at the bottom of the extraction chamber can flow fully to improve the uniformity of the extraction liquid.

[0013] In an optional embodiment, first overflow ports are provided at both ends of the baffle top close to the side wall of the extraction tank, and a plurality of overflow channels arranged along the extension direction of the baffle top are provided between the two first overflow ports.

[0014] In the above implementation process, first overflow ports are provided on both sides of the top of the baffle, and the pore-forming agent on the surface of the extraction liquid in the extraction chamber can overflow from the two first overflow ports, thereby improving the discharge efficiency of the extracted pore-forming agent and further improving the extraction quality. Multiple overflow channels arranged along the extension direction of the top of the baffle are provided between the two first overflow ports, which can improve the overflow efficiency of the liquid in the middle of the baffle and further improve the fluidity of the extraction liquid at the bottom or middle of the extraction chamber.

[0015] In an optional embodiment, the first overflow port is a through groove structure, and the width of the first overflow port along the extension direction of the baffle top is 2-4 cm.

[0016] In the above implementation process, the first overflow port is a through groove structure, and the width of the first overflow port along the extension direction of the baffle top is 2-4 cm, which can reduce the impact force of the liquid overflow on the diaphragm while ensuring the liquid flow rate and flow cycle frequency, thereby improving the extraction quality of the diaphragm.

[0017] In an optional embodiment, a plurality of baffles are arranged at intervals in the extraction tank; the positions of the first overflow ports of the plurality of baffles in the height direction along the movement direction of the diaphragm are increased in a step-by-step manner, and the height difference of the step-by-step increase is 2-4 cm.

[0018] In the above implementation process, multiple baffles are arranged at intervals in the extraction tank, and the first overflow ports of the multiple baffles are stepped up in the height direction along the movement direction of the diaphragm. The movement direction of the diaphragm is opposite to the overflow direction of the extract, so that the oil content in the last extraction chamber of the extraction tank along the movement direction of the diaphragm can be minimized, thereby improving the extraction quality. The height difference of the stepped increase is 2-4 cm, which can reduce the impact force on the diaphragm while ensuring the overflow efficiency, thereby improving the extraction quality.

[0019] In an optional embodiment, a diaphragm inlet groove is further provided at one end where the diaphragm begins to enter the extraction tank, and the diaphragm inlet groove is adjacent to and communicates with the extraction tank, so that the diaphragm enters the extraction tank through the diaphragm inlet groove.

[0020] In the above implementation process, the extraction tank is further provided with a diaphragm inlet groove at one end where the diaphragm begins to enter the extraction tank, and the diaphragm can enter the extraction tank through the diaphragm inlet groove.

[0021] In an optional embodiment, the diaphragm inlet groove is provided with a second overflow port at the entrance where the diaphragm enters the diaphragm inlet groove, the diaphragm inlet groove is provided with a third overflow port on the side close to the extraction groove, and a fourth overflow port is provided in the extraction chamber adjacent to the diaphragm inlet groove.

[0022] In an optional embodiment, the lithium battery diaphragm extraction device also includes an overflow collection tank; the fourth overflow port and the third overflow port are connected to the overflow collection tank through a three-way pipe; the three-way pipe is provided with a valve, and the valve can selectively connect the fourth overflow port with the third overflow port, the fourth overflow port with the overflow collection tank, and the second overflow port is connected to the overflow collection tank through a second pipe.

[0023] In the above implementation process, under normal production conditions, the liquid in the extraction tank can flow from the fourth overflow port through the three-way pipe into the third overflow port, flow into the diaphragm inlet tank from the third overflow port, and then flow into the second pipe from the second overflow port at the diaphragm inlet tank, and flow into the overflow collection tank from the second pipe.

[0024] If there is a sudden abnormality that causes the liquid level in the extraction tank and the diaphragm inlet tank to be too high and the liquid cannot be discharged to the overflow collection tank through the second overflow port in time, the valve can be opened to discharge the liquid in the fourth overflow port to the overflow collection tank through the three-way pipe, and at the same time, the liquid in the diaphragm inlet tank can be discharged from the second overflow port to the overflow collection tank through the second pipe to speed up the discharge efficiency.

[0025] If there is a sudden abnormality and the diaphragm inlet tank needs to be repaired, the valve can be directly operated to disconnect the fourth overflow port from the third overflow port, and the liquid in the extraction tank overflows from the fourth overflow port to the overflow collection tank.

[0026] In an optional embodiment, a support beam extending along the top extension direction is provided at the notch of the extraction tank corresponding to the position of the baffle, and sealing grooves that are interconnected are provided on the circumferential edge of the notch and the support beam; the sealing groove is provided with a liquid outlet and a liquid inlet, the liquid inlet is used to transport sealing liquid to the sealing groove, and the liquid outlet is used to discharge the sealing liquid in the sealing groove.

[0027] In an optional embodiment, the lithium battery diaphragm extraction device is provided with multiple slot covers corresponding to the extraction chambers one by one, each slot cover is provided with side panels around it, and the side panels of the multiple slot covers are inserted into the sealing groove one by one to close the slot opening.

[0028] In the above implementation process, a sealing groove is provided at the notch of the extraction tank and the support beam corresponding to the baffle position, and a liquid inlet and a liquid outlet are provided in the sealing groove. When the notch needs to be sealed, the side plate of the tank cover can be extended into the sealing groove, and then the sealing liquid is injected into the sealing groove through the liquid inlet to seal the gap between the side plate of the tank cover and the sealing groove, thereby sealing the extraction chamber and reducing the probability of leakage caused by the volatilization of the extraction liquid in the extraction chamber. When the tank cover needs to be opened, the sealing liquid in the sealing groove can be discharged through the liquid outlet before opening the tank cover, thereby reducing the probability of the sealing liquid falling into the extraction chamber along the side plate when the tank cover is opened. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below.

[0030] Figure 1 A schematic cross-sectional view of a lithium battery membrane extraction device provided as an example of this application;

[0031] Figure 2 A schematic diagram of the structure of the baffle provided for the example of this application;

[0032] Figure 3 for Figure 1 A partial enlarged view of A in FIG.

[0033] Figure 4 for Figure 1 A partial enlarged view of B in FIG.

[0034] Figure 5 Schematic diagram of the connection between the slot cover and the sealing slot provided for the example of this application.

[0035] Icons: 100-diaphragm; 1-lithium battery diaphragm extraction device; 10-extraction tank; 11-extraction chamber; 12-roller; 13-fourth overflow port; 20-baffle; 21-top; 22-first overflow port; 23-overflow channel; 231-inlet; 232-outlet; 30-diaphragm inlet groove; 31-second overflow port; 32-third overflow port; 40-overflow collection tank; 51-tee pipe; 52-second pipeline; 53-valve; 61-support beam; 62-sealing groove; 621-liquid inlet; 622-liquid outlet; 63-tank cover; 631-side panel; L1-height difference. DETAILED DESCRIPTION

[0036] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions.

[0038] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0039] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0040] In the description of the embodiments of the present application, the orientations or positional relationships indicated by technical terms such as "upper", "lower", "left", "right", "bottom", and "inside" are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the embodiments of the present application and simplifying the description. They do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0041] In the preparation process of the wet-process diaphragm, the diaphragm 100 product itself is processed with materials such as oily pore-forming agents such as paraffin oil and PE powder, and the purpose of extraction is to extract the oily pore-forming agents in the diaphragm 100 to form pores in the diaphragm 100. If the liquid in the extraction tank does not overflow, the oily pore-forming agents such as paraffin oil extracted during the production process will cause the concentration of the extract in the tank to decrease, and the oily pore-forming agents such as paraffin oil may adhere to the diaphragm 100 and move in the same direction as the diaphragm 100. When the pore-forming agents such as paraffin oil move to the extraction chamber located at the rear end of the travel direction of the diaphragm 100, the concentration of the extract in the extraction chamber will decrease, and the extracted diaphragm 100 will cause defects such as oil stains, affecting the extraction quality of the diaphragm 100.

[0042] Therefore, the present application further improves the lithium battery diaphragm extraction device 1, thereby improving the extraction quality to a certain extent. In order to make the purpose, technical solution and advantages of the embodiment of the present application clearer, the technical solution in the embodiment of the present application will be clearly and completely described below in conjunction with the drawings in the embodiment of the present application.

[0043] Please combine Figure 1 and Figure 2 The lithium battery diaphragm extraction device 1 includes an extraction tank 10, in which a baffle 20 is arranged, and the baffle 20 separates the space in the extraction tank 10 to form an extraction chamber 11 on both sides of the baffle 20; a first overflow port 22 is arranged at least at one end of the top 21 of the baffle 20 close to the side wall of the extraction tank 10, and an overflow channel 23 is also arranged inside the baffle 20, and the overflow channel 23 vertically penetrates the baffle 20, and the inlet 231 of the overflow channel 23 is located in the middle of the top 21 of the baffle 20, and the outlet 232 of the overflow channel 23 is located below the inlet 231 of the overflow channel 23.

[0044] When the lithium battery membrane extraction device 1 provided in the example of the present application is used for the extraction process, Figure 1In the process, the diaphragm 100 will penetrate from the extraction chamber 11 on the left side of the baffle 20 from the top of the baffle 20 into the extraction chamber 11 on the right side of the baffle 20, and gradually perform extraction. The diaphragm 100 is in contact with the extraction liquid in the extraction chamber 11, and the extraction liquid can extract the paraffin oil and other pore formers at the diaphragm 100. The extraction liquid is, for example, dichloromethane. Since the density of the paraffin oil and other pore formers is relatively light, the paraffin oil and other pore formers extracted by the extraction liquid tend to be located on the surface of the extraction liquid.

[0045] In order to reduce the probability of paraffin oil and other pore-forming agents on the surface of the extraction liquid moving with the diaphragm 100, and to reduce the influence of the extracted paraffin oil and other pore-forming agents on the concentration of the extraction liquid, in the lithium battery diaphragm extraction device 1 provided in the example of the present application, a first overflow port 22 is provided at one end of the top 21 of the baffle 20 close to the side wall of the extraction tank 10. Figure 1 In the embodiment, the diaphragm 100 penetrates from the extraction chamber 11 on the left side of the baffle 20 into the extraction chamber 11 on the right side of the baffle 20. Since the fluid on the surface of the extraction chamber 11 on the right side of the baffle 20 can overflow into the extraction chamber 11 on the left side of the baffle through the first overflow port 22, the moving direction of the diaphragm 100 is opposite to the overflow direction of the fluid, which can improve the fluidity of the extract, improve the separation efficiency of the pore-forming agent such as paraffin oil and the extract, reduce the probability of the pore-forming agent such as paraffin oil adhering to the diaphragm 100, and improve the extraction quality.

[0046] Furthermore, since the first overflow port 22 is disposed at the two ends of the top 21 of the baffle 20 close to the side wall of the extraction tank 10, the extract in the middle of the baffle 20 is difficult to flow fully, so the paraffin oil and other pore-forming agents extracted from the extraction chamber 11 will inevitably remain in the middle of the baffle 20. Figure 2 An overflow channel 23 is also provided inside the baffle 20 . The overflow channel 23 vertically penetrates the baffle 20 . An inlet 231 of the overflow channel 23 is located in the middle of the top 21 of the baffle 20 , and an outlet 232 of the overflow channel 23 is located below the inlet 231 of the overflow channel 23 .

[0047] Figure 1 In the extraction process, the diaphragm penetrates from the extraction chamber 11 on the left side of the baffle 20 into the extraction chamber 11 on the right side of the baffle 20, and the fluid in the extraction chamber 11 on the right side can flow into the overflow channel 23 inside the baffle 20 from the inlet 231 at the middle of the top 21, flow vertically in the overflow channel 23, and then flow out from the outlet 232 at the bottom to the extraction chamber 11 on the left side, which can make the extraction liquid in the extraction chamber 11 located in the middle of the baffle 20 flow fully, improve the overflow efficiency of the extracted pore former, avoid the accumulation of the pore former in the middle of the baffle 20, and improve the quality of the diaphragm.

[0048] In the lithium battery diaphragm extraction device 1 provided in the example of the present application, a first overflow port 22 and an overflow channel 23 are provided at the baffle 20 to form two overflow modes, which can improve the extraction quality of the diaphragm 100 .

[0049] The extraction tank 10 and the baffle 20 in the lithium battery diaphragm extraction device 1 provided in the example of the present application are further described in detail below in conjunction with the accompanying drawings.

[0050] Please continue reading Figure 1 Each extraction chamber 11 in the extraction tank 10 is provided with a plurality of rollers 12 for conveying the diaphragm 100. The plurality of rollers 12 in each extraction chamber 11 are arranged at intervals up and down, so that the diaphragm 100 moves up and down in a "U" shape around the rollers 12 in the extraction chamber 11, so as to increase the travel of the diaphragm 100 in the extraction chamber 11 and make the diaphragm 100 fully contact with the extract.

[0051] For example, please refer to Figure 1 , five rollers 12 are arranged at intervals on the top of each extraction chamber 11, and one roller 12 is arranged between two top rollers 12 at the bottom of the extraction chamber 11. The top rollers 12 move clockwise, and the bottom rollers 12 move counterclockwise. The top rollers 12 at the extraction chamber 11 on the left side of the diaphragm 100 pass through the top rollers 12 at the adjacent extraction chamber 11 on the right side.

[0052] Please continue reading Figure 2 A first overflow port 22 is provided on one side of the extension direction of the top 21 of the baffle 20. In a possible embodiment, the first overflow port 22 is a through groove structure, and the width of the first overflow port 22 along the extension direction of the top 21 of the baffle 20 is 2-4 cm.

[0053] For example, the width of the first overflow port 22 may be in the range of 2 cm, 2.5 cm, 3 cm, 3.5 cm or 4 cm, or any two thereof.

[0054] If the width of the first overflow port 22 is too large, for example, greater than 4 cm, the liquid will flow faster, which will increase the impact force of the fluid on the diaphragm 100 and cause the diaphragm 100 to deviate, wrinkle, scratch, and other hidden dangers during operation.

[0055] If the width of the first overflow port 22 is too small, for example, less than 2 cm, the liquid flow rate will be slow, affecting the flow cycle frequency of the liquid in the cavity.

[0056] Furthermore, first overflow ports 22 may be provided on both sides of the top 21 of the baffle 20 .

[0057] An overflow channel 23 is disposed inside the baffle 20 . The overflow channel 23 vertically penetrates the baffle 20 . An inlet 231 of the overflow channel 23 is located in the middle of the top 21 of the baffle 20 . An outlet 232 of the overflow channel 23 is located below the inlet 231 of the overflow channel 23 .

[0058] In a possible embodiment, the height of the location of the outlet 232 does not exceed half of the height of the baffle 20 .

[0059] For example, please refer to Figure 2 , the outlet 232 may be located at the bottom end of the baffle 20 .

[0060] Furthermore, the shape of the overflow channel 23 can be set to be cylindrical, elliptical or prism.

[0061] Furthermore, a plurality of overflow channels 23 may be provided inside the baffle plate 20 . The plurality of overflow channels 23 are provided between the two first overflow ports 22 and are arranged at intervals along the extension direction of the top 21 of the baffle plate 20 .

[0062] Furthermore, the multiple overflow channels 23 inside the baffle 20 are isolated from each other.

[0063] For further information, please refer to Figure 1 , a plurality of baffles 20 may be arranged in the extraction tank 10 at intervals to sequentially divide the internal space of the extraction tank 10 into a plurality of extraction chambers 11. Figure 1 and Figure 3 The positions of the first overflow ports 22 of the plurality of baffles 20 in the height direction along the moving direction of the diaphragm 100 are increased in a step-like manner.

[0064] Furthermore, the height difference L1 of the stepped rise is 2-4 cm.

[0065] Exemplarily, the height difference L1 of the stepped elevation may be in the range of one or any two of 2 cm, 2.5 cm, 3 cm, 3.5 cm or 4 cm.

[0066] The height difference L1 of the first overflow ports 22 of the plurality of baffles 20 in the height direction is limited to 2-4 cm in a step-by-step manner, so as to improve the extraction quality.

[0067] If the height difference L1 of the stepped rise is too small, for example, less than 2 cm, the overflow efficiency will be affected, resulting in that the pore-forming agent such as paraffin oil on the surface cannot overflow in time, thereby affecting the extraction quality of the diaphragm 100 .

[0068] If the height difference L1 of the stepped rise is too large, for example, greater than 4 cm, the overflow velocity of the fluid will be fast and the flow rate will be too large, which will affect the stability of the diaphragm 100 in the cavity and increase the energy consumption of the subsequent liquid recovery process, thereby increasing the extraction cost.

[0069] Furthermore, in order to facilitate observation of the liquid level in the extraction tank 10 , in a possible embodiment, a visual liquid level gauge may be provided at the extraction chamber 11 in the extraction tank 10 corresponding to the inlet and outlet ends of the diaphragm 100 .

[0070] Further, please combine Figure 1 and Figure 4 The lithium battery diaphragm extraction device 1 provided in the example of the present application may also be provided with a diaphragm inlet slot 30 . The diaphragm inlet slot 30 is adjacent to and communicates with the extraction tank 10 , so that the diaphragm 100 enters the extraction tank 10 through the diaphragm inlet slot 30 .

[0071] For further information, please refer to Figure 4 The diaphragm inlet groove 30 is provided with a second overflow port 31 at the entrance of the diaphragm entering the diaphragm inlet groove 30 , the diaphragm inlet groove 30 is provided with a third overflow port 32 on the side close to the extraction tank 10 , and the extraction chamber 11 adjacent to the diaphragm inlet groove 30 is provided with a fourth overflow port 13 .

[0072] Furthermore, a partition plate may be provided in the membrane inlet groove 30 to divide the membrane inlet groove 30 into two chambers, the second overflow port 31 is provided in the chamber close to the membrane inlet, and the third overflow port 32 is provided in the chamber close to the extraction chamber 11 .

[0073] Furthermore, a sealing cover may be provided at the membrane inlet groove 30, and the side wall of the sealing cover extends into the chamber of the membrane inlet groove 30 near the membrane inlet and covers the upper end of the other chamber. During operation, the bottom end of the side wall is located below the liquid surface, and the membrane 100 passes between the side wall and the bottom wall of the membrane inlet groove 30 and enters the other chamber, which can reduce the probability of dichloromethane and the like in the extract in the extraction tank 10 leaking from the membrane inlet.

[0074] Furthermore, a membrane outlet groove may be provided on one side of the extraction tank 10 corresponding to the outlet of the membrane 100. For example, a membrane inlet groove 30 may be provided at the membrane outlet groove to facilitate the membrane to pass through and to seal the dichloromethane and other substances in the extraction chamber 11.

[0075] Furthermore, in order to facilitate the processing of the fluid overflowing from the diaphragm inlet groove 30 , in a possible embodiment, the lithium battery diaphragm extraction device 1 may also be provided with an overflow collection groove 40 .

[0076] The second overflow port 31 is connected to the overflow collection tank 40 through the second pipe 52 , so that the liquid overflowing step by step in the extraction tank 10 can be collected into the overflow collection tank 40 .

[0077] During the operation of the lithium battery membrane extraction device 1, unexpected abnormalities may occur. For example, the second pipe 52 connecting the second overflow port 31 and the overflow collection tank 40 is blocked and needs to be repaired. In order to facilitate timely discharge of the overflowed liquid in the extraction tank 10 to the overflow collection tank 40 when the second pipe 52 is blocked, in a possible embodiment, please combine Figure 1 and Figure 4 The fourth overflow port 13 and the third overflow port 32 can be connected to the overflow collection tank 40 through a three-way pipe 51.

[0078] The three-way pipe 51 is provided with a valve 53 , and the valve 53 can selectively connect the fourth overflow port 13 with the third overflow port 32 , and connect the fourth overflow port 13 with the overflow collecting tank 40 .

[0079] When a sudden abnormal situation occurs and the second pipeline 52 needs to be repaired, the valve 53 can be operated to connect the fourth overflow port 13 with the overflow collection tank 40 through the three-way pipe 51. The liquid overflowing from the extraction tank 10 can be directly transported to the overflow collection tank 40 through the three-way pipe 51, avoiding the continuous transportation of the liquid overflowing from the extraction tank 10 to the diaphragm inlet tank 30, which is convenient for operators to perform maintenance.

[0080] Furthermore, when the liquid in the diaphragm inlet groove 30 is full and the discharge speed is low due to an abnormal sudden occurrence, the valve 53 can be operated to connect the fourth overflow port 13 with the third overflow port 32, and the fourth overflow port 13 with the overflow collection tank 40. At this time, a part of the liquid overflowing from the extraction tank 10 flows from the fourth overflow port 13 through the three-way pipe 51 to the diaphragm inlet groove 30, and flows out to the overflow collection tank 40 at the diaphragm inlet groove 30 through the third overflow port 32, the second overflow port 31 and the second pipe in sequence. Another part of the liquid overflowing from the extraction tank 10 flows directly from the fourth overflow port 13 through the three-way pipe 51 to the overflow collection tank 40, which can speed up the discharge speed.

[0081] Furthermore, in order to reduce the probability of volatilization and leakage of substances such as dichloromethane in the extraction liquid, in a possible embodiment, the lithium battery diaphragm extraction device 1 provided in the example of the present application may also be provided with a sealing structure.

[0082] Please combine Figure 1 , Figure 3 and Figure 5A support beam 61 extending along the extension direction of the top 21 is provided at the position of the notch of the extraction tank 10 corresponding to the baffle 20, and mutually connected sealing grooves 62 are provided on the circumferential edge of the notch and the support beam 61; a tank cover 63 is provided at the position corresponding to each extraction chamber 11, and side plates 631 are provided around the tank cover 63, and the side plates 631 are inserted into the sealing groove 62. Sealing liquid is provided in the sealing groove 62, and the gap between the side plates 631 and the inner bottom wall of the sealing groove 62 is liquid-sealed to achieve the sealing of the extraction tank 10.

[0083] Further, in order to facilitate the delivery of the sealing liquid into the sealing groove 62, in a possible embodiment, please continue to refer to Figure 5 , a liquid inlet 621 may be provided at the sealing groove 62 .

[0084] When the extraction tank 10 needs to be sealed, the side plates 631 of the tank cover 63 are inserted into the sealing tank 62 one by one, and then the sealing liquid is transported into the sealing tank 62 through the liquid inlet 621 for liquid sealing.

[0085] In a possible embodiment, the sealing liquid may be water.

[0086] Further, in order to reduce the probability that the sealing liquid in the sealing groove 62 falls into the extraction chamber 11 along the side plate 631 when the groove cover 63 is opened, please continue to refer to Figure 5 , a liquid outlet 622 may be provided at the sealing groove 62. Before the groove cover 63 is opened, the sealing liquid in the sealing groove 62 is discharged through the liquid outlet 622.

[0087] Furthermore, in order to improve the discharge efficiency of the sealing liquid, in a possible embodiment, a plurality of liquid outlets 622 may be provided at the sealing groove 62 .

[0088] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A lithium battery diaphragm extraction device, characterized in that: include: An extraction tank, wherein a baffle is disposed in the extraction tank, and the baffle divides the space in the extraction tank to form an extraction cavity on both sides of the baffle; A first overflow port is provided at at least one end of the top of the baffle plate close to the side wall of the extraction tank, and an overflow channel is also provided inside the baffle plate. The overflow channel vertically penetrates the baffle plate, the inlet of the overflow channel is located in the middle of the top of the baffle plate, and the outlet of the overflow channel is located below the inlet.

2. The lithium battery diaphragm extraction device according to claim 1, characterized in that: The height of the location of the outlet does not exceed half the height of the baffle; Alternatively, the outlet is located at the bottom end of the baffle.

3. The lithium battery diaphragm extraction device according to claim 1, characterized in that: The first overflow ports are arranged at both ends of the top of the baffle plate close to the side wall of the extraction tank, and a plurality of overflow channels arranged along the extension direction of the top of the baffle plate are arranged between the two first overflow ports.

4. The lithium battery diaphragm extraction device according to claim 1, characterized in that: The first overflow port is a through groove structure, and the width of the first overflow port along the extension direction of the baffle top is 2-4 cm.

5. The extraction device according to any one of claims 1 to 4, characterized in that: A plurality of baffles are arranged at intervals in the extraction tank; the positions of the first overflow ports of the plurality of baffles in the height direction along the movement direction of the diaphragm are increased in a step-by-step manner, and the height difference of the step-by-step increase is 2-4 cm.

6. The lithium battery diaphragm extraction device according to claim 5, characterized in that: A diaphragm inlet groove is also provided at one end where the diaphragm begins to enter the extraction tank. The diaphragm inlet groove is adjacent to and communicates with the extraction tank, so that the diaphragm enters the extraction tank through the diaphragm inlet groove.

7. The lithium battery diaphragm extraction device according to claim 6, characterized in that: The diaphragm inlet groove is provided with a second overflow port in the entrance where the diaphragm enters the diaphragm inlet groove, the diaphragm inlet groove is provided with a third overflow port on the side close to the extraction groove, and the extraction chamber adjacent to the diaphragm inlet groove is provided with a fourth overflow port.

8. The lithium battery diaphragm extraction device according to claim 7, characterized in that: The lithium battery diaphragm extraction device also includes an overflow collection tank; the fourth overflow port and the third overflow port are connected to the overflow collection tank through a three-way pipe; the three-way pipe is provided with a valve, and the valve can selectively connect the fourth overflow port with the third overflow port, the fourth overflow port with the overflow collection tank, and the second overflow port is connected to the overflow collection tank through a second pipe.

9. The lithium battery diaphragm extraction device according to claim 1, characterized in that: A support beam extending along the top extension direction is arranged at the position of the notch of the extraction tank corresponding to the baffle, and mutually connected sealing grooves are arranged on the circumferential edge of the notch and the support beam; the sealing groove is provided with a liquid outlet and a liquid inlet, the liquid inlet is used to convey sealing liquid to the sealing groove, and the liquid outlet is used to discharge the sealing liquid in the sealing groove.

10. The lithium battery diaphragm extraction device according to claim 9, characterized in that: The lithium battery diaphragm extraction device is provided with a plurality of slot covers corresponding to the extraction chambers one by one, and each of the slot covers is provided with side panels around it, and the side panels of the plurality of slot covers are inserted into the sealing slots one by one to close the slot openings.

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