Process for preparing a wide-membrane for a large-capacity heat storage and energy storage battery

Abstract

The application discloses a preparation process of a wide-width separator for a large-capacity heat storage and energy storage battery and belongs to the technical field of separator preparation.The application is used to solve the technical problem of the existing wide-width separator that is prone to producing wavy edges and vertical edges in the production process and is prone to producing pinholes and gels on the battery separator.The preparation process of the wide-width separator for the large-capacity heat storage and energy storage battery comprises the following operation steps: the following raw materials are weighed according to weight parts: 50 parts of polyethylene, 50 parts of polypropylene, 1-1.5 parts of a nucleating agent, 0.6-1 parts of sodium tripolyphosphate and 4-8 parts of nano silicon dioxide are uniformly mixed to obtain a raw material mixture.The application can not only block the pinholes generated in the stretching process of the separator, prevent the production of wavy edges or vertical edges in the stretching process, reduce the thickness deviation of the separator and improve the production quality of the separator, but also effectively improves the conductivity, liquid absorption rate and retention of the separator.

Description

Technical Field

[0001] This invention relates to the field of separator manufacturing technology, and more specifically to the manufacturing process of wide-width separators for large-capacity thermal energy storage batteries. Background Technology

[0002] A battery separator is a membrane material placed between the positive and negative electrodes of a battery. It is a very critical part of the battery and has a direct impact on battery safety and cost. Its main functions are to isolate the positive and negative electrodes and prevent electrons from passing freely through the battery, while allowing ions in the electrolyte to pass freely between the positive and negative electrodes. In the battery separator manufacturing process, processes such as melt extrusion, casting, and stretching are often required to ensure good mechanical properties of the battery separator.

[0003] Existing battery separators for large-capacity thermal energy storage batteries have a large width. During the stretching process, the wide battery separator is prone to wavy edges and sagging edges, resulting in significant thickness deviations and affecting the production quality of the battery separator. Furthermore, due to the large width of the battery separator, uneven stress occurs during the stretching process, leading to pinholes and gel formation on the produced battery separator, increasing the defect rate. In addition, the lithium-ion conductivity, washing efficiency, and capacity retention of existing battery separators all need further improvement.

[0004] To address this technical deficiency, a solution is proposed. Summary of the Invention

[0005] The purpose of this invention is to provide a manufacturing process for a wide-width separator for large-capacity thermal energy storage batteries, which solves the technical problems in the prior art where the separators used in large-capacity thermal energy storage batteries are large in width, and the wide-width separators are prone to wavy edges and sagging edges during the production process, and pinholes and gel defects are easily generated on the battery separators during the stretching process.

[0006] The objective of this invention can be achieved through the following technical solutions:

[0007] The fabrication process of wide-width separators for high-capacity thermal energy storage batteries includes the following steps:

[0008] S1. Weigh the following raw materials according to the following weight parts: 50 parts of polyethylene, 50 parts of polypropylene, 1 to 1.5 parts of nucleating agent, 0.6 to 1 part of sodium tripolyphosphate, and 4 to 8 parts of nano silica. Mix them evenly to obtain a raw material mixture. The nucleating agent is a mixture of one or more components of sodium benzoate, sodium cyclohexanecarboxylate, sodium diphenylacetate, and cyclohexylamide.

[0009] S2. Add the raw material mixture to the extruder, melt and extrude, then rapidly cool and cast into sheets to obtain a sheet-like wide-width diaphragm primary product;

[0010] S3. After stacking the three wide-width diaphragm primary products layer by layer, heat them to make the three wide-width diaphragm primary products composite together to obtain wide-width diaphragm crude product.

[0011] S4. The wide-width diaphragm rough product enters the stretching device from the feeding channel. The feeding mechanism, coating mechanism and conveying mechanism work simultaneously. The feeding mechanism and conveying mechanism convey the wide-width diaphragm rough product to the discharge channel at a stable speed. There is a stable speed difference between the feeding mechanism and the conveying mechanism. The wide-width diaphragm rough product is stretched by the heating plate heating and melting section to ensure stable tensile strength. After the coating mechanism evenly coats a layer of molten raw material mixture on both sides of the stretched wide-width diaphragm, it enters the cooling mechanism for rapid cooling and solidification. Then, after the grinding mechanism grinds both sides of the diaphragm, it is conveyed to the outside of the stretching device to obtain the wide-width diaphragm semi-finished product.

[0012] S5. The thickness deviation, porosity, heat shrinkage rate, puncture strength, tensile strength and permeability of the wide-width diaphragm semi-finished product are tested. After passing the test, the wide-width diaphragm finished product is obtained by slitting, winding and packaging.

[0013] Furthermore, the stretching device includes a base plate, and a cover is fixed to the top of the base plate. The bottom of both ends of the cover are respectively provided with a feeding channel and a discharging channel arranged along its width direction. The base plate is provided with a feeding mechanism, a heating mechanism, a coating mechanism, a cooling mechanism, a grinding mechanism, a transmission mechanism, and a driving mechanism installed outside the cover to drive the feeding mechanism, the coating mechanism, and the transmission mechanism to operate simultaneously. The heating mechanism includes a groove provided on the top of the base plate along its width direction, and a heating plate is installed on the bottom inner wall of the groove.

[0014] The coating mechanism includes a storage box fixed to the top of the base plate along its width direction. A coating roller one is rotatably installed inside the storage box, and a coating roller two is rotatably installed inside the cover along its width direction. The coating roller two is located directly above the coating roller one and cooperates with the coating roller one. Both the coating roller one and the coating roller two are fitted with paint brushes.

[0015] Furthermore, a partition plate is fixed to the top of the bottom plate near the discharge channel to separate an installation chamber inside the cover, in which the grinding mechanism and the transmission mechanism are both located;

[0016] The polishing mechanism includes two polishing rollers rotatably installed in the mounting chamber along the width of the base plate and a servo motor installed outside the cover to drive the two polishing rollers to rotate synchronously. A vacuum cleaner is installed at the bottom of the base plate, and the suction end of the vacuum cleaner extends to the inside of the mounting chamber.

[0017] Furthermore, the transmission mechanism includes a transmission roller that is rotatably mounted inside the mounting cavity and arranged along the width direction of the base plate. The two transmission rollers are stacked and are made of rubber material.

[0018] Furthermore, the driving mechanism includes a housing fixed to one side of the outer wall of the casing and arranged along its length. A transmission shaft arranged along its length is rotatably mounted on the inner side of the housing. A servo motor two for driving the transmission shaft to rotate is mounted on one side of the housing. Three worm gears are sleeved on the outside of the transmission shaft. Two worm wheels one, two worm wheels two, and one worm wheel three are rotatably mounted on the inner side of the housing. The diameters of worm wheels one and two are the same and smaller than the diameter of worm wheel three. Worm wheels one, two worm wheels two, and three worm wheels three are respectively meshed with the three worm gears. Among them, the two worm wheels one are respectively connected to two transmission rollers, and the two worm wheels two are respectively connected to coating roller one and coating roller two.

[0019] Furthermore, the feeding mechanism includes an installation groove on the base plate, with transmission rollers rotatably mounted at both ends of the installation groove along the length of the base plate. A transmission belt is sleeved on the outside of the two transmission rollers, and one end of one of the transmission rollers is connected to a worm gear transmission. The transmission belt has multiple through holes, and an air collecting hood corresponding to the installation groove is fixed to the bottom of the base plate. An exhaust fan is installed at the bottom of the air collecting hood.

[0020] Furthermore, the coating roller two has a hollow structure, and multiple discharge holes connected to its interior are opened on the outside of the coating roller two. A storage tank is installed on the top of the cover, and a connecting pipe is sleeved on one side of the storage tank. The bottom of the connecting pipe extends to the inside of the coating roller two.

[0021] Furthermore, a scraper plate 1 is fixedly connected to the top of the end of the storage box away from the feeding channel, which is arranged along the width direction of the bottom plate. A scraper plate 2 is arranged parallel to the scraper plate 1 directly above it. A receiving box is fixedly connected to the side of the scraper plate 2 away from the feeding channel. Both ends of the scraper plate 2 and the receiving box are fixedly connected to the inner side wall of the cover. Guide pipes are sleeved at the bottom of both ends of the receiving box. The bottom of both guide pipes extends to the top of the inner side of the storage box.

[0022] Furthermore, the cooling mechanism includes a U-shaped mounting plate fixedly installed on the top of the base plate. One end of the mounting plate near the partition plate is fixedly connected to the outer wall of the partition plate, and the partition plate is provided with a channel communicating with the installation chamber. Multiple heat exchange tubes are installed on the inner top of the mounting plate.

[0023] The present invention has the following beneficial effects:

[0024] 1. The wide-width separator in this invention is composed of three layers of wide-width separator preforms, which effectively improves the thermal dimensional stability of the wide-width separator and ensures uniform mixing of all raw material components. This results in a finished separator with uniform pore size and high porosity. Testing shows that the lithium-ion conductivity of the wide-width battery separator in this invention is greater than 0.85 mS·cm. -1 With a liquid absorption rate greater than 350% and a membrane capacity retention rate greater than 95.0% after 100 cycles, the battery membrane produced by this invention has significantly improved lithium-ion conductivity, liquid absorption rate, and membrane capacity retention rate compared to traditional battery membranes.

[0025] 2. The stretching device in this invention, through the cooperation of the feeding mechanism, the transmission mechanism and the driving mechanism, can heat the battery separator and control the stable speed difference between the feeding mechanism and the transmission mechanism located at both ends of the heated section of the separator, thereby stretching the battery separator. After the separator is stretched, it quickly enters the cooling mechanism for rapid cooling and shaping, thereby avoiding the appearance of wavy edges or sagging edges on the wide separator due to the long length of the stretched separator.

[0026] 3. The stretching device in this invention, through the cooperation of coating roller one, coating roller two, scraper one, scraper two and driving mechanism, can drive coating roller one and coating roller two to rotate synchronously while the driving transmission mechanism moves, thereby coating a layer of molten raw material mixture on both sides of the diaphragm. The molten raw material mixture enters into the pinholes generated by the stretching of the diaphragm and seals the pinholes. Scraper one and scraper two can form a squeezing action to promote the adhesion of the molten raw material mixture to the outer surface of the diaphragm and scrape off the excess coating material on the diaphragm for recycling. The thickness of the diaphragm is shaped by scraper one and scraper two, which can ensure that the thickness of the diaphragm is relatively uniform and reduce thickness deviation.

[0027] 4. The grinding mechanism in the stretching device of the present invention can grind both sides of the diaphragm, so as to avoid the formation of gel-like droplets on the outer surface of the diaphragm due to uneven distribution of the molten raw material mixture on the outer surface of the diaphragm during the stretching process due to gravity, which would cause the outer surface of the diaphragm to be uneven and reduce the thickness deviation of the diaphragm. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a three-dimensional structural diagram of the overall tensioning device in this invention;

[0030] Figure 2 This is a top view of the tensioning device in this invention.

[0031] Figure 3 This is a frontal sectional view of the tensioning device in this invention.

[0032] Figure 4 This is a schematic diagram of the overall structure of the drive mechanism in this invention;

[0033] Figure 5 This is a schematic diagram of the overall structure of the coating mechanism in this invention;

[0034] Figure 6 This is a schematic diagram of the structure of the coating roller II in this invention.

[0035] In the diagram: 1. Base plate; 101. Groove; 102. Heating plate; 103. Divider plate; 2. Cover; 201. Feeding channel; 202. Discharge channel; 3. Feeding mechanism; 301. Drive roller; 302. Conveyor belt; 303. Air collector; 304. Exhaust fan; 4. Coating mechanism; 401. Storage box; 402. Coating roller one; 403. Coating roller two; 404. Discharge hole; 405. Paint brush; 406. Scraper one; 407. Scraper two; 408. 409. Material receiving box; 410. Material guide pipe; 411. Material storage tank; 412. Connecting pipe; 5. Cooling mechanism; 501. Mounting plate; 502. Heat exchange pipe; 6. Grinding mechanism; 601. Grinding roller; 602. Servo motor one; 603. Vacuum cleaner; 7. Transmission mechanism; 701. Transmission roller; 8. Drive mechanism; 801. Housing; 802. Drive shaft; 803. Servo motor two; 804. Worm; 805. Worm wheel one; 806. Worm wheel two; 807. Worm wheel three. Detailed Implementation

[0036] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] Example 1

[0038] The fabrication process of the wide-width separator for the large-capacity thermal energy storage battery in this embodiment includes the following steps:

[0039] S1. Weigh the following raw materials according to the following weight parts: 502g polyethylene, 501g polypropylene, 108g nucleating agent, 6.3g sodium tripolyphosphate, and 53g nano silica. Mix them evenly to obtain a raw material mixture. The nucleating agent is a mixture of one or more components of sodium benzoate, sodium cyclohexanecarboxylate, sodium diphenylacetate, and cyclohexamide.

[0040] S2. Add the raw material mixture to the extruder, melt and extrude, then rapidly cool and cast into sheets to obtain a sheet-like wide-width diaphragm primary product;

[0041] S3. After stacking the three wide-width diaphragm primary products layer by layer, heat them to make the three wide-width diaphragm primary products composite together to obtain wide-width diaphragm crude product.

[0042] S4. The wide-width diaphragm crude product enters the stretching device from the feed channel 201. The feeding mechanism 3, coating mechanism 4 and conveying mechanism 7 work simultaneously. The feeding mechanism 3 and conveying mechanism 7 convey the wide-width diaphragm crude product to the discharge channel 202 at a stable speed. There is a stable speed difference between the feeding mechanism 3 and the conveying mechanism 7. The wide-width diaphragm crude product is stretched by the heating plate 102 heating and melting section to ensure stable tensile strength. After the wide-width diaphragm is evenly coated with a layer of molten raw material mixture on both sides by the coating mechanism 4, it enters the cooling mechanism 5 for rapid cooling and solidification. Then, after the grinding mechanism 6 grinds both sides, it is conveyed to the outside of the stretching device to obtain the wide-width diaphragm semi-finished product.

[0043] S5. The thickness deviation, porosity, heat shrinkage rate, puncture strength, tensile strength and permeability of the wide-width diaphragm semi-finished product are tested. After passing the test, the wide-width diaphragm finished product is obtained by slitting, winding and packaging.

[0044] Example 2

[0045] This embodiment addresses the problem in the prior art that wide-width separators are prone to wavy edges and sagging edges during production, resulting in defects such as gelation and carbonized polymers on the battery separator.

[0046] Please see Figure 1-3The manufacturing process of the wide-width separator for large-capacity thermal energy storage batteries in this embodiment includes a stretching device comprising a base plate 1, a cover 2 fixedly attached to the top of the base plate 1, and a feeding channel 201 and a discharging channel 202 respectively provided at the bottom of both ends of the cover 2 along its width direction. The base plate 1 is provided with a feeding mechanism 3, a heating mechanism, a coating mechanism 4, a cooling mechanism 5, a polishing mechanism 6, a transmission mechanism 7 and a driving mechanism 8 installed outside the cover 2 to drive the feeding mechanism 3, the coating mechanism 4 and the transmission mechanism 7 to operate simultaneously. The heating mechanism includes a groove 101 provided at the top of the base plate 1 along its width direction, and a heating plate 102 installed on the bottom inner wall of the groove 101.

[0047] The wide-width diaphragm rough product enters the inner side of the housing 2 through the feed channel 201. The drive mechanism 8 drives the feeding mechanism 3, coating mechanism 4 and transfer mechanism 7 to work at a uniform speed. The feeding mechanism 3 drives the wide-width diaphragm rough product to move towards the discharge channel 202 at a lower speed than the transfer mechanism 7. The wide-width diaphragm rough product is heated by the heating plate 102 to soften it. The transfer mechanism 7 stretches the wide-width diaphragm rough product. After the coating mechanism 4 coats both sides of the product with molten raw material mixture, the product enters the cooling mechanism 5 for rapid cooling and solidification. This avoids the stretching section being too long, which would cause the wide-width diaphragm to have wavy or sagging edges.

[0048] To prevent gel or carbonized polymer from forming on the diaphragm, a partition plate 103 is fixed to the top of one end of the base plate 1 near the discharge channel 202 to create an installation chamber inside the housing 2. The grinding mechanism 6 and the transmission mechanism 7 are both located in the installation chamber.

[0049] The polishing mechanism 6 includes two polishing rollers 601 rotatably mounted in the mounting chamber and arranged along the width direction of the base plate 1, and a servo motor 602 mounted outside the cover 2 for driving the two polishing rollers 601 to rotate synchronously. A vacuum cleaner 603 is mounted on the bottom of the base plate 1, and the suction end of the vacuum cleaner 603 extends to the inside of the mounting chamber.

[0050] Servo motor 602 drives two grinding rollers 601 to rotate simultaneously, grinding both sides of the diaphragm to make the diaphragm smooth and prevent the formation of gel or carbonized polymer on the diaphragm.

[0051] In order to transfer the wide diaphragm to the outside of the housing 2, the transfer mechanism 7 includes a transfer roller 701 that is rotatably mounted inside the housing cavity and arranged along the width direction of the base plate 1. The two transfer rollers 701 are stacked and are made of rubber material.

[0052] A wide diaphragm is positioned between two transfer rollers 701, which clamp and fix the wide diaphragm. The drive mechanism 8 drives the two transfer rollers 701 to rotate simultaneously. The transfer roller 701 above the diaphragm rotates counterclockwise, while the transfer roller 701 below the diaphragm rotates clockwise, conveying the diaphragm to the discharge channel. The transfer rollers 701, made of rubber material, can effectively increase the friction between the transfer rollers 701 and the wide diaphragm, maintaining stable transmission.

[0053] In order to convey the wide-width diaphragm coarse product into the inner side of the housing 2 and control the conveying speed, the feeding mechanism 3 includes a mounting groove opened on the base plate 1. Both ends of the mounting groove are rotatably mounted with transmission rollers 301 arranged along the length direction of the base plate 1. A transmission belt 302 is sleeved on the outside of the two transmission rollers 301. One end of one of the transmission rollers 301 is connected to the worm gear 307 for transmission. Multiple through holes are opened on the transmission belt 302. An air collecting hood 303 corresponding to the mounting groove is fixed to the bottom of the base plate 1. An exhaust fan 304 is installed at the bottom of the air collecting hood 303.

[0054] When the exhaust fan 304 operates, it draws air out of the air collection hood 303, creating a negative pressure in the mounting slot. This negative pressure is then drawn through multiple through holes on the conveyor belt 302, tightly adsorbing the wide-width diaphragm coarse product onto the conveyor belt 302 and preventing relative movement between the wide-width diaphragm coarse product and the conveyor belt 302. The drive mechanism 8 drives the transmission roller 301 to rotate, thereby driving the conveyor belt 302 to rotate clockwise. This ensures that the wide-width diaphragm coarse product is stably conveyed towards the discharge channel 202 while preventing relative movement between the product and the conveyor belt 302 under the traction of the transmission mechanism 7.

[0055] To rapidly cool and shape the stretched diaphragm, the cooling mechanism 5 includes a U-shaped mounting plate 501 fixedly installed on the top of the base plate 1. One end of the mounting plate 501 near the partition plate 103 is fixedly connected to the outer wall of the partition plate 103, and the partition plate 103 is provided with a channel communicating with the installation chamber. Multiple heat exchange tubes 502 are installed on the inner top of the mounting plate 501.

[0056] The heat exchange tube 502 is connected to the heat exchange equipment, which reduces the temperature inside the mounting plate 501. This allows the stretched high-temperature diaphragm to be quickly cooled and formed after entering the mounting plate 501, thus preventing the unformed high-temperature diaphragm from having wavy or sagging edges when moving along the length of the base plate 1. This ensures that the tensile force on the molten section is uniform and stable.

[0057] Example 3

[0058] This embodiment addresses the problem that wide-width diaphragms in the prior art are prone to defects such as pinholes, gels, and carbonized polymers during the production process.

[0059] Please see Figure 3 , Figure 5 and Figure 6 In the manufacturing process of the wide-width separator for the large-capacity thermal energy storage battery in this embodiment, the coating mechanism 4 includes a storage box 401 fixedly attached to the top of the base plate 1 and arranged along its width direction. A coating roller 402 is rotatably mounted on the inner side of the storage box 401, and a coating roller 403 arranged along its width direction is rotatably mounted on the inner side of the cover 2. The coating roller 403 is located directly above the coating roller 402 and cooperates with the coating roller 402. A paint brush 405 is sleeved on the outside of both the coating roller 402 and the coating roller 403.

[0060] The driving mechanism 8 drives the coating roller 1 402 and the coating roller 2 403 to rotate synchronously with the two transmission rollers 701, uniformly coating a layer of molten raw material mixture onto the stretched part of the diaphragm, thereby filling the pinholes generated on the diaphragm during the stretching process and forming a protective layer on both sides of the diaphragm, achieving a combination of rigidity and flexibility, thereby improving the mechanical properties of the diaphragm.

[0061] In order to uniformly coat the molten raw material mixture onto the coating roller 403, the coating roller 403 has a hollow structure. The outer side of the coating roller 403 has multiple discharge holes 404 that are connected to its interior. A storage tank 410 is installed on the top of the cover 2. A connecting pipe 411 is sleeved on one side of the storage tank 410. The bottom of the connecting pipe 411 extends to the inner side of the coating roller 403.

[0062] Heating and insulation plates are provided on the storage tank 401, coating roller 403, storage tank 410 and connecting pipe 411 to prevent the raw material mixture from solidifying. The molten raw material mixture in the storage tank 410 enters the inner side of the coating roller 403 through the connecting pipe 411. Under the action of gravity, the molten raw material mixture tends to flow downward, so that the molten raw material mixture is evenly distributed on the outside of the coating roller 403, thereby uniformly coating the molten raw material mixture on the diaphragm.

[0063] To ensure sufficient contact between the raw material mixture that promotes melting on the diaphragm and the diaphragm, and to scrape off excess molten raw material mixture, a scraper plate 406 is fixedly attached to the top of the storage tank 401 at the end away from the feed channel 201, and is arranged along the width direction of the bottom plate 1. A scraper plate 407 is provided directly above the scraper plate 406 and is arranged parallel to it. A receiving box 408 is fixedly attached to the side of the scraper plate 407 away from the feed channel 201. Both ends of the scraper plate 407 and the receiving box 408 are fixedly attached to the inner side wall of the cover 2. Guide tubes 409 are sleeved on the bottom of both ends of the receiving box 408, and the bottom of both guide tubes 409 extends to the inner top of the storage tank 401.

[0064] When the diaphragm moves toward the discharge channel 202, it moves relative to scraper plate 406 and scraper plate 407, thereby uniformly coating the molten raw material mixture onto the diaphragm and scraping off the excess molten raw material mixture from the diaphragm. It also shapes the diaphragm between scraper plate 406 and scraper plate 407, making the thickness difference of the diaphragm smaller. The excess molten raw material mixture scraped off from the top surface of the diaphragm collects upward along the inclined surface of scraper plate 407 and enters the receiving box 408. It is then guided into the storage box 401 through the guide pipe 409 for recycling. The excess molten raw material mixture scraped off from the diaphragm floor slides down scraper plate 406 and into the storage box 401.

[0065] Example 4

[0066] This embodiment addresses the problem in the prior art where, during the stretching process, the stretched diaphragm is prone to large thickness deviations due to uneven stress.

[0067] Please see Figure 1 , Figure 2 and Figure 4 In the manufacturing process of the wide-width separator for the large-capacity thermal energy storage battery of this embodiment, the driving mechanism 8 includes a housing 801 fixed to one side of the outer wall of the housing 2 and arranged along its length. A transmission shaft 802 arranged along its length is rotatably mounted on the inner side of the housing 801. A servo motor 803 for driving the transmission shaft 802 is mounted on one side of the housing 801. Three worm gears 804 are sleeved on the outside of the transmission shaft 802. Two worm gears 805, two worm gears 806, and one worm gear 807 are rotatably mounted on the inner side of the housing 801. The diameters of the worm gears 805 and 806 are the same and smaller than the diameter of the worm gear 807. The worm gears 805, 806, and 807 mesh with the three worm gears 804 respectively. The two worm gears 805 are connected to the two transmission rollers 701 respectively, and the two worm gears 806 are connected to the coating rollers 402 and 403 respectively.

[0068] All three worm gears 804 are cylindrical structures. The servo motor 803 drives the transmission shaft 802 to rotate, which in turn drives the three worm gears 804 to rotate synchronously. This drives the two worm wheels 805, 806, and 807 to rotate simultaneously, which in turn drives the two transmission rollers 701, coating roller 402, coating roller 403, and transmission roller 301 to rotate simultaneously. Since the diameters of the worm wheels 805 and 806 are the same and smaller than the diameter of the worm wheel 807, when the worm gears 804 rotate at the same speed, the transmission roller 301 rotates at a different speed than the two transmission rollers 701, coating roller 402, and coating roller 403, and at a lower speed than the two transmission rollers 701, coating roller 402, and coating roller 403. This ensures that the diaphragm rough product located on both sides of the heating plate 102 maintains a stable speed difference towards the discharge channel, thereby stretching the diaphragm rough product.

[0069] like Figure 1-6 As shown, the working process and principle of this invention are as follows:

[0070] In use, the following raw materials are weighed according to weight: 50 parts polyethylene, 50 parts polypropylene, 1-1.5 parts nucleating agent, 0.6-1 part sodium tripolyphosphate, and 4-8 parts nano silica. These are mixed evenly to obtain a raw material mixture. The nucleating agent is a mixture of one or more components, including sodium benzoate, sodium cyclohexanecarboxylate, sodium diphenylacetate, and cyclohexylamide. The raw material mixture is added to an extruder, melt-extruded, and rapidly cooled to form sheets. After testing for thickness deviation, porosity, and permeability, and passing the tests, a sheet-like wide-width diaphragm precursor is obtained. Three wide-width diaphragm precursors are stacked layer by layer and heated to combine them. Their thickness deviation, porosity, and permeability are then tested, and after passing the tests, a wide-width diaphragm rough product is obtained. The wide-width diaphragm rough product enters the inner side of the housing 2 through the feed channel 201, and one end of the wide-width diaphragm rough product enters the two transfer rollers 7. Between 01 and 02, the drive mechanism 8 drives the feeding mechanism 3, coating mechanism 4 and transmission mechanism 7 to work simultaneously. The feeding mechanism 3 and transmission mechanism 7 convey the wide-width diaphragm crude product to the discharge channel 202 at a stable speed. There is a stable speed difference between the feeding mechanism 3 and the transmission mechanism 7, which stretches the wide-width diaphragm crude product in the heating and melting section to ensure stable tensile strength. The stretched wide-width diaphragm is coated with a layer of molten raw material mixture on both sides by the coating mechanism 4 and then enters the cooling mechanism 5 for rapid cooling and solidification. After passing the grinding mechanism 6, both sides are ground and then conveyed to the outside of the cover 2 to obtain the wide-width diaphragm semi-finished product. The thickness deviation, porosity, heat shrinkage rate, puncture strength, tensile strength and permeability of the wide-width diaphragm semi-finished product are tested. After passing the test, the wide-width diaphragm finished product is obtained by slitting, winding and packaging.

[0071] The above description is merely an example and illustration of the structure of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described, or use similar methods to replace them, as long as they do not deviate from the structure of the invention or exceed the scope defined in the claims, all of which should fall within the protection scope of the present invention.

[0072] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0073] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to specific implementations. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A process for producing a wide-width separator for a large-capacity thermal storage battery, characterized by, The method comprises the following steps: S1, the following raw materials are weighed according to weight parts: polyethylene 50 parts, polypropylene 50 parts, nucleating agent 1-1.5 parts, sodium tripolyphosphate 0.6-1 part, nano silicon dioxide 4-8 parts, and the mixture is uniformly mixed to obtain a raw material mixture, wherein the nucleating agent is a mixture of one or more components of sodium benzoate, sodium cyclohexane carboxylate, sodium diphenyl acetate and cyclohexamide; S2, the raw material mixture is added to the extruder, melted and extruded, and the cast piece is rapidly cooled to obtain a sheet-shaped wide-width separator primary product; S3, the three wide-width separator primary products are stacked and heated to make the three wide-width separator primary products composite together to obtain a wide-width separator crude product; S4, the wide-width separator crude product enters the stretching device from the feeding channel (201), the feeding mechanism (3), the coating mechanism (4) and the conveying mechanism (7) work simultaneously, the feeding mechanism (3) and the conveying mechanism (7) transport the wide-width separator crude product to the discharging channel (202) at a stable speed, and there is a stable speed difference between the feeding mechanism (3) and the conveying mechanism (7), the wide-width separator crude product is stretched in the heating and melting section of the heating plate (102) to ensure stable stretching strength, the coating mechanism (4) uniformly coats a layer of molten raw material mixture on the stretched wide-width separator, and then the stretched wide-width separator enters the cooling mechanism (5) for rapid cooling and solidification, and then the polishing mechanism (6) is used to polish the two sides of the wide-width separator, and then the wide-width separator is conveyed to the outside of the stretching device to obtain a wide-width separator semi-finished product; S5, the thickness deviation, porosity, thermal shrinkage rate, puncture strength, tensile strength and transmittance of the wide-width separator semi-finished product are detected, and after the detection is qualified, the wide-width separator semi-finished product is cut, wound and packaged to obtain a wide-width separator finished product; The stretching device comprises a bottom plate (1), a cover (2) is fixed to the top of the bottom plate (1), two ends of the cover (2) are respectively provided with a feeding channel (201) and a discharging channel (202) arranged along the width direction thereof, the bottom plate (1) is sequentially provided with a feeding mechanism (3), a heating mechanism, a coating mechanism (4), a cooling mechanism (5), a polishing mechanism (6), a conveying mechanism (7) and a driving mechanism (8) installed outside the cover (2) and used for driving the feeding mechanism (3), the coating mechanism (4) and the conveying mechanism (7) to work simultaneously from the feeding channel (201) to the discharging channel (202), and the heating mechanism comprises a groove (101) arranged along the width direction of the top of the bottom plate (1), and a heating plate (102) is installed on the bottom inner wall of the groove (101); The coating mechanism (4) comprises a storage tank (401) fixed to the top of the bottom plate (1) and arranged along the width direction thereof, a coating roller one (402) is rotatably installed on the inner side of the storage tank (401), a coating roller two (403) is rotatably installed on the inner side of the cover (2) and arranged along the width direction thereof, the coating roller two (403) is located directly above the coating roller one (402) and cooperates with the coating roller one (402), and a coating brush (405) is sleeved on the outer part of the coating roller one (402) and the coating roller two (403).

2. The process for producing a wide-membrane for a large-capacity heat storage battery according to claim 1, characterized by, The bottom plate (1) is fixedly connected with a partition plate (103) at the top of one end close to the discharging channel (202), so as to divide an installation chamber in the inside of the cover shell (2), and the polishing mechanism (6) and the conveying mechanism (7) are located in the installation chamber. The polishing mechanism (6) comprises two polishing rollers (601) rotatably installed in the installation chamber and arranged along the width direction of the bottom plate (1), and a servo motor (602) installed outside the cover shell (2) and used for driving the two polishing rollers (601) to synchronously rotate, and a dust collector (603) is installed at the bottom of the bottom plate (1) and extends to the inside of the installation chamber.

3. The process for producing a wide-membrane for a large-capacity heat storage battery according to claim 2, characterized by, The conveying mechanism (7) comprises conveying rollers (701) rotatably installed in the inside of the installation chamber and arranged along the width direction of the bottom plate (1), and the two conveying rollers (701) are arranged in layers and are made of rubber material.

4. The process for producing a wide-membrane for a large-capacity heat storage battery according to claim 3, characterized by, The driving mechanism (8) comprises an outer shell (801) fixedly connected to one side of the outer wall of the cover shell (2) and arranged along the length direction thereof, a transmission shaft (802) rotatably installed at the inside of the outer shell (801) and arranged along the length direction thereof, a servo motor (803) installed at one side of the outer shell (801) and used for driving the transmission shaft (802) to rotate, three worm gears (804) sleeved at the outside of the transmission shaft (802), two worm gears (805), two worm gears (806) and one worm gear (807) rotatably installed at the inside of the outer shell (801), wherein the diameters of the worm gears (805) and the worm gears (806) are the same and smaller than the diameter of the worm gear (807), and the worm gears (805), the worm gears (806) and the worm gear (807) are respectively engaged with the three worm gears (804), and the two worm gears (805) are respectively in transmission connection with the two conveying rollers (701), and the two worm gears (806) are respectively in transmission connection with the coating roller (402) and the coating roller (403).

5. The process for producing a wide-membrane for a large-capacity heat storage battery according to claim 4, characterized in that, The feeding mechanism (3) comprises a mounting groove formed in the bottom plate (1), and transmission rollers (301) rotatably installed at both ends of the mounting groove and arranged along the length direction of the bottom plate (1), and a transmission belt (302) sleeved at the outside of the two transmission rollers (301), wherein one end of one of the transmission rollers (301) is in transmission connection with the worm gear (807), and a plurality of through holes are formed in the transmission belt (302), and a wind collecting cover (303) corresponding to the mounting groove is fixedly connected to the bottom of the bottom plate (1), and an air extractor (304) is installed at the bottom of the wind collecting cover (303).

6. The process for producing a wide-membrane for a large capacity heat storage battery according to claim 1, characterized in that, The coating roller (403) is of a hollow structure, a plurality of discharging holes (404) are formed in the outside of the coating roller (403) and are in communication with the inside thereof, a storage tank (410) is installed at the top of the cover shell (2), a connecting pipe (411) is sleeved at one side of the outside of the storage tank (410), and the bottom of the connecting pipe (411) extends to the inside of the coating roller (403).

7. The process for producing a wide-membrane for a large capacity heat storage battery according to claim 1, characterized in that, The top of one end of the storage tank (401) away from the feeding channel (201) is fixedly connected with a scraping plate one (406) arranged along the width direction of the bottom plate (1), and the top of the scraping plate one (406) is provided with a scraping plate two (407) arranged in parallel thereto, the side of the scraping plate two (407) away from the feeding channel (201) is fixedly connected with a receiving tank (408), the two ends of the scraping plate two (407) and the receiving tank (408) are fixedly connected with the inner side wall of the cover shell (2), the bottom of the two ends of the receiving tank (408) is sleeved with a guide pipe (409), and the bottom of the two guide pipes (409) extends to the inner side top of the storage tank (401).

8. The process for producing a wide-membrane for a large capacity heat storage battery according to claim 2, characterized in that, The cooling mechanism (5) comprises a U-shaped arrangement plate (501) fixedly installed on the top of the bottom plate (1), one end of the arrangement plate (501) close to the partition plate (103) is fixedly connected with the outer wall of the partition plate (103), and the partition plate (103) is provided with a channel in communication with the mounting cavity, and a plurality of heat exchange pipes (502) are installed on the inner side top of the arrangement plate (501).

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