A high-performance zinc-bromine flow battery diaphragm and its preparation method

Abstract

The invention discloses a high-performance zinc-bromine liquid flow battery diaphragm and a preparation method thereof, comprising the following steps: S1, preparing a base film; S2, feeding base film particles into a twin-screw extruder, extruding the base film into a film at 200°C, feeding the extruded film into a tape casting machine, and the film flowing out of the tape casting machine has a thickness of 50 μm; S3, feeding the film into a biaxial stretching machine, and stretching the film longitudinally and transversely at a stretching temperature of 120°C; S4, feeding the stretched film into a coating machine, and coating both sides of the film with an ion conductive layer and a hydrophobic layer, respectively, with the thickness of the ion conductive layer and the hydrophobic layer both being 5-10 μm; S5, feeding the coated diaphragm into a heat treatment furnace, and heat-treating and curing the diaphragm at 120°C to form the diaphragm; S6, feeding the cured diaphragm into a winding device for winding. The invention adopts a zinc-bromine liquid flow battery diaphragm formed by compounding a bio-based degradable polymer and high-temperature-resistant inorganic nanoparticles, so that the diaphragm has the characteristics of being degradable while having high performance and high-temperature resistance.

Description

Technical Field

[0001] The present invention relates to the technical field of battery separators, in particular to a separator for a high-performance zinc-bromine flow battery and a preparation method thereof. Background Art

[0002] With the global energy transition and the rapid development of renewable energy, efficient, safe, and environmentally friendly energy storage technologies have become a research hotspot. Zinc-bromine flow batteries, as a promising energy storage device, are currently under investigation for performance improvements and cost reductions. The separator, a crucial component of zinc-bromine flow batteries, plays a crucial role in their performance and lifespan.

[0003] Currently, the separator materials commonly used in zinc-bromine flow batteries primarily include polyolefins (such as polyethylene (PE) and polypropylene (PP)) and fluoropolymers (such as polytetrafluoroethylene (PTFE)). While these materials meet the basic requirements of batteries to a certain extent, they have limitations in terms of biodegradability. These materials are difficult to decompose in the natural environment, causing long-term environmental pollution.

[0004] At the same time, during the diaphragm production process, it was found that when using the existing diaphragm winding equipment, the diaphragm needs to be manually wound around the winding roller several times to ensure that the winding roller can normally perform the diaphragm winding work. This process not only reduces the diaphragm winding efficiency, but also has certain risks during the winding process.

[0005] For example, a lithium battery diaphragm winding device disclosed in a Chinese patent with announcement number CN217024655U includes a winding box and a diaphragm. Two horizontal plates are fixedly connected to the rear wall of the inner cavity of the winding box. Two support plates are fixedly provided at the ends close to each other. A rotating shaft is rotatably connected between the front and rear support plates, and a cleaning roller is installed on the outer wall of the rotating shaft. The diaphragm is wound by rotating the connecting shaft and the winding roller through a first motor. When the connecting shaft rotates, the upper and lower rotating shafts and the two cleaning rollers are driven to rotate together through a linkage mechanism. The rotation of the two cleaning rollers can clean the upper and lower surfaces of the diaphragm at the same time, and can clean impurities and dust adhered to the diaphragm during transportation, which can greatly improve the winding quality of the diaphragm, and thus significantly improve the subsequent processing and production quality of lithium batteries.

[0006] When the above device is actually used, it is still necessary to manually wind the diaphragm around the winding roller several times to ensure that the winding roller can normally perform the diaphragm winding work, and the winding roller is inconvenient to disassemble and assemble.

[0007] Therefore, a high-performance zinc-bromine flow battery separator and a preparation method thereof are proposed. Summary of the Invention

[0008] The object of the present invention is to provide a high-performance zinc-bromine flow battery diaphragm and a preparation method thereof, thereby solving or at least alleviating one or more of the above-mentioned problems and other problems existing in the prior art.

[0009] To achieve the above object, the present invention provides the following technical solution: a method for preparing a high-performance zinc-bromine flow battery diaphragm, comprising the following steps:

[0010] S1. Preparation of base film: 50-80 parts by weight of polylactic acid, 10-30 parts of silicon dioxide, and 10-30 parts of aluminum oxide are added into a mixer and mixed evenly for copolymerization and modification. The mixture is then fed into an extruder for extrusion and cutting to obtain base film particles.

[0011] S2, the base film particles are fed into a twin-screw extruder and extruded into a film at 200°C. The extruded film is fed into a tape casting machine. The thickness of the film flowing out of the tape casting machine is 50 μm.

[0012] S3, the film is sent to a biaxial stretching machine for longitudinal and transverse stretching, with a longitudinal and transverse stretching ratio of 1.5:1 and a stretching temperature of 120°C;

[0013] S4. The stretched film is fed into a coating machine, where an ion conductive layer and a hydrophobic layer are coated on both sides of the film, respectively. The thickness of the ion conductive layer and the hydrophobic layer are both 5-10 μm.

[0014] S5, sending the coated diaphragm into a heat treatment furnace, and heat-treating and curing it at 120° C. to form a diaphragm;

[0015] S6. The cured diaphragm is sent to the winding device for winding.

[0016] In the method for preparing a high-performance zinc-bromine flow battery diaphragm according to the present invention, optionally, the winding device comprises:

[0017] A support frame, one end of which is fixedly mounted with a support plate;

[0018] The support plate is provided with a clamping mechanism, and the clamping mechanism is provided with a winding assembly;

[0019] The clamping mechanism includes two vertical plates, both of which are fixedly mounted on the support plate of the support frame, a first screw rod is rotatably connected between the two vertical plates, the threads at both ends of the first screw rod are arranged in opposite directions, and both ends of the first screw rod are threadedly rotatably connected to a movable seat, a first motor is fixedly mounted on one side of one of the vertical plates, a rotating shaft of the first motor is fixedly connected to one end of the first motor, a guide rod is fixedly connected between the two vertical plates, and the movable seat is slidably sleeved on the guide rod;

[0020] The winding assembly includes two rotating shafts, and the two rotating shafts are rotatably connected to the corresponding movable seats, and a third motor is fixedly installed on one of the movable seats, and the rotating shaft of the third motor is fixedly connected to one end of the rotating shaft on the movable seat, and the rotating shaft away from the third motor is tubularly arranged, and a winding roller is arranged between the two rotating shafts, and the winding roller is tubularly arranged, and a plurality of air holes are opened on the winding roller. One end of the two rotating shafts is sealed and inserted into the two ends of the winding roller respectively, and one end of the tubular rotating shaft is connected to a connecting hose through a rotary joint, and a blower is fixedly installed on the support plate, and the air inlet of the blower is provided with an air intake pipe, and the air intake pipe is connected to a branch pipe, and the branch pipe is connected to the end of the connecting hose away from the rotating shaft.

[0021] In the method for preparing a high-performance zinc-bromine liquid flow battery diaphragm according to the present invention, optionally, limit disks are provided on both of the rotating shafts, and the limit disks are slidably mounted on the rotating shafts via a material stripping piece.

[0022] In a method for preparing a diaphragm for a high-performance zinc-bromine liquid flow battery according to the present invention, optionally, the material stripping part includes a telescopic rod, a first spring and a fixed disk, the fixed disk is fixedly sleeved on one end of the rotating shaft close to the movable seat, one end of the telescopic rod is fixedly connected to one side of the limiting disk, and the other end of the telescopic rod is fixedly connected to one end of the fixed disk, the first spring is sleeved on the telescopic rod, one end of the first spring is against one side of the limiting disk, and the other end of the first spring is against one side of the fixed disk.

[0023] In a method for preparing a high-performance zinc-bromine flow battery diaphragm according to the present invention, optionally, a tightening mechanism is provided on the support plate through the pushing mechanism, and the tightening mechanism is used to tighten the wound diaphragm so that the diaphragm can be tightly wound on the winding roller;

[0024] The pushing mechanism includes two vertical blocks, each of which is fixedly connected to the support plate, a second screw rod is rotatably installed between the two vertical blocks, a slide rail is fixedly installed on the support plate, and a movable plate is slidably installed on the slide rail through a slider, a nut is fixedly installed on the bottom of the movable plate, and the nut threadably sleeved on the second screw rod, a second motor is fixedly installed on the bottom of one end of the support plate, a first synchronous wheel is fixedly connected to the rotating shaft of the second motor, and one end of the second screw rod is fixedly connected to the second synchronous wheel, and the first synchronous wheel and the second synchronous wheel are connected by a synchronous belt transmission;

[0025] The tightening mechanism includes two arc-shaped plates, and a plurality of tightening rods are arranged between the two arc-shaped plates. The bottom of the arc-shaped plate is fixedly connected with an insertion rod, and the lower end of the insertion rod slides through the movable plate. A second spring is sleeved on the insertion rod, and the top of the second spring is pressed against the bottom of the arc-shaped plate, and the bottom of the second spring is pressed on the movable plate.

[0026] In a method for preparing a diaphragm for a high-performance zinc-bromine liquid flow battery according to the present invention, optionally, a limit piece capable of preventing the pressing rod from rising is provided at the bottom of the support plate, two strip holes are provided at the top of the support plate, the limit piece includes a cylinder, the piston rod end of the cylinder is fixedly connected to a limit slide bar, the bottoms of both ends of the two arc-shaped plates are fixedly connected to a guide column, the lower end of the guide column slides through the movable plate and then passes through the bottom of the strip hole, a limit notch is provided on the inner side of the guide column, the limit slide bar can extend into the limit notch, and the limit notch is in sliding contact with the limit slide bar.

[0027] In a method for preparing a high-performance zinc-bromine liquid flow battery diaphragm according to the present invention, optionally, one end of the limiting sliding rod is fixedly connected to the limiting plug rod, the bottom of the support plate is fixedly connected to a sliding sleeve, and the end of the limiting plug rod away from the limiting sliding rod is slidably inserted into the sliding sleeve.

[0028] In a method for preparing a diaphragm for a high-performance zinc-bromine flow battery according to the present invention, optionally, a cooling mechanism for air-cooling the diaphragm is provided on the support frame, and the cooling mechanism includes a transverse tube, which is fixedly mounted on the support frame via a mounting block, and the lower end of the transverse tube has a plurality of air jets in a linear equidistant array, and one end of the transverse tube is connected to the air outlet of the blower via an air supply pipe.

[0029] In a method for preparing a high-performance zinc-bromine liquid flow battery diaphragm according to the present invention, optionally, a cutting mechanism is provided on the support frame, and the cutting mechanism is provided between the winding assembly and the cooling mechanism. The cutting mechanism includes a linear module, and the linear module is fixedly mounted on the upper end of the support frame, and a cutter is fixedly mounted on the slide of the linear module.

[0030] The present invention also provides a high-performance zinc-bromine liquid flow battery diaphragm, which is prepared by the above-mentioned method for preparing a high-performance zinc-bromine liquid flow battery diaphragm.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] The present invention adopts a zinc-bromine flow battery diaphragm composed of a bio-based degradable polymer and high-temperature resistant inorganic nanoparticles, so that the diaphragm has high performance and high temperature resistance while also having the characteristics of degradation.

[0033] By setting the winding assembly in conjunction with the winding roller and the blower, it is possible to realize that when the diaphragm is wound, the blower is started to form a negative pressure inside the winding roller, thereby making one end of the diaphragm to be wound fit on the winding roller, and then the third motor is started to quickly wind the diaphragm on the winding roller, thereby effectively improving the winding efficiency. After the winding is completed, the clamping mechanism is controlled to drive the two rotating shafts to move away from each other, thereby realizing the rapid disassembly of the winding roller and improving the replacement efficiency of the winding roller. Moreover, the clamping mechanism can clamp the winding roller of any size, thereby realizing the winding operation of diaphragms of multiple sizes.

[0034] The tightening mechanism can tighten the wound diaphragm so that it is tightly wound on the winding roller. The pushing mechanism can deliver the wound diaphragm to the unloading area, which is convenient for workers to unload materials and quick to replace the winding roller.

[0035] The position limiting member can limit the pressing mechanism to prevent the arc plate from rising under the elastic force of the second spring when the winding roller on the pressing mechanism is lifted and removed;

[0036] The cooling mechanism provided cooperates with the blower to cool the wound diaphragm to avoid the temperature of the wound diaphragm being too high. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 This is one of the structural schematic diagrams of a winding device in a method for preparing a high-performance zinc-bromine flow battery diaphragm according to the present invention;

[0038] Figure 2 This is the second structural schematic diagram of the winding device in the method for preparing a high-performance zinc-bromine flow battery diaphragm of the present invention;

[0039] Figure 3 This is a schematic structural diagram of a winding assembly in a method for preparing a high-performance zinc-bromine flow battery diaphragm according to the present invention;

[0040] Figure 4 This is a structural schematic diagram of another perspective of a winding assembly in a method for preparing a high-performance zinc-bromine flow battery diaphragm according to the present invention;

[0041] Figure 5 This is a schematic structural diagram of a material pushing mechanism in a method for preparing a high-performance zinc-bromine flow battery diaphragm according to the present invention;

[0042] Figure 6 for Figure 5 A schematic diagram of the enlarged structure of part A;

[0043] Figure 7 This is a schematic structural diagram of a tightening mechanism in a method for preparing a high-performance zinc-bromine flow battery diaphragm according to the present invention;

[0044] Figure 8 A schematic diagram of the structure of a clamping mechanism and a winding assembly in a method for preparing a high-performance zinc-bromine flow battery diaphragm according to the present invention;

[0045] Figure 9 for Figure 8 Schematic diagram of the enlarged structure of part B;

[0046] Figure 10 A schematic diagram of the bottom-up structure of a support plate in a method for preparing a diaphragm for a high-performance zinc-bromine flow battery according to the present invention;

[0047] Figure 11 A schematic structural diagram of a cutting mechanism in a method for preparing a diaphragm for a high-performance zinc-bromine flow battery according to the present invention.

[0048] In the figure: 1, support frame; 101, support plate; 1011, strip hole;

[0049] 2. Winding assembly; 201. Rotating shaft; 202. Limiting plate; 203. Material stripping member; 2031. Telescopic rod; 2032. First spring; 2033. Fixed plate; 204. Third motor;

[0050] 3. Clamping mechanism; 301. Vertical plate; 302. First motor; 303. First screw rod; 304. Moving seat; 305. Guide rod;

[0051] 4. Tightening mechanism; 401. Arc plate; 4011. Guide column; 40111. Limiting notch; 4012. Insertion rod; 4013. Second spring;

[0052] 5. Cutting mechanism; 501. Linear module; 502. Cutter;

[0053] 6. Pushing mechanism; 601. Second motor; 602. Second screw rod; 603. Vertical block; 604. Slide rail; 605. First synchronous wheel; 606. Second synchronous wheel; 607. Synchronous belt; 608. Moving plate; 6081. Slider; 6082. Nut;

[0054] 7. Cooling mechanism; 701. Blower; 702. Air intake pipe; 703. Connecting hose; 704. Mounting block; 705. Transverse pipe; 706. Injection nozzle;

[0055] 8. Limiting member; 801. Cylinder; 802. Limiting slide bar; 803. Sliding sleeve; 804. Limiting rod;

[0056] 9. Winding roller; 901. Air hole. DETAILED DESCRIPTION

[0057] The technical solution of the present invention will be further described below with reference to the accompanying drawings and through specific implementation methods.

[0058] Among them, the drawings are only used for illustrative purposes and represent only schematic diagrams rather than actual pictures, and should not be understood as limiting this patent; in order to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0059] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "inside", "outside" and the like indicate an orientation or position relationship based on the orientation or position relationship shown in the drawings, it is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0060] In the description of the present invention, unless otherwise expressly specified or limited, when the term "connection" or the like appears to indicate a connection relationship between components, such term should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be internal communication between two components or an interaction between two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood in specific circumstances.

[0061] Example 1

[0062] See also Figures 1 to 11 This embodiment provides a high-performance zinc-bromine flow battery diaphragm and a preparation method thereof, comprising the following steps:

[0063] S1. Preparation of base film: 50-80 parts by weight of polylactic acid, 10-30 parts of silicon dioxide, and 10-30 parts of aluminum oxide are added into a mixer and mixed evenly for copolymerization and modification. The mixture is then fed into an extruder for extrusion and cutting to obtain base film particles.

[0064] S2, the base film particles are fed into a twin-screw extruder and extruded into a film at 200°C. The extruded film is fed into a tape casting machine. The thickness of the film flowing out of the tape casting machine is 50 μm.

[0065] S3, the film is sent to a biaxial stretching machine for longitudinal and transverse stretching, with a longitudinal and transverse stretching ratio of 1.5:1 and a stretching temperature of 120°C;

[0066] S4. The stretched film is fed into a coating machine, where an ion conductive layer and a hydrophobic layer are coated on both sides of the film, respectively. The thickness of the ion conductive layer and the hydrophobic layer are both 5-10 μm.

[0067] S5, sending the coated diaphragm into a heat treatment furnace, and heat-treating and curing it at 120° C. to form a diaphragm;

[0068] S6. The cured diaphragm is sent to the winding device for winding.

[0069] In step S1, a mixing uniformity model can be established to ensure uniform mixing of the base film raw materials. This model can evaluate the mixing effect by calculating the distribution differences between different components. For example, the mixing uniformity (U) can be expressed using the following formula:

[0070]

[0071] Where: C i represents the concentration at the ith position, Cavg is the average concentration, and N is the number of measurement points.

[0072] Technical effect: By optimizing mixing parameters such as temperature and time, the uniformity and stability of the base film can be improved, thereby affecting the quality of the final diaphragm.

[0073] In this embodiment, the winding device includes: a support frame 1, a support plate 101 is fixedly mounted on one end of the support frame 1, a clamping mechanism 3 is provided on the support plate 101, and a winding assembly 2 is provided on the clamping mechanism 3;

[0074] The clamping mechanism 3 includes two vertical plates 301, both of which are fixedly mounted on the support frame support plate 101. A first screw rod 303 is rotatably connected between the two vertical plates 301. The threads at both ends of the first screw rod 303 are arranged in opposite directions. Both ends of the first screw rod 303 are rotatably connected to a movable seat 304. A first motor 302 is fixedly mounted on one side of one of the vertical plates 301. The rotating shaft of the first motor 302 is fixedly connected to one end of the first motor 302. A guide rod 305 is fixedly connected between the two vertical plates 301. The movable seat 304 is slidably sleeved on the guide rod 305.

[0075] Among them, the winding assembly 2 includes two rotating shafts 201, which are rotatably connected to the corresponding movable seats 304 respectively, and a third motor 204 is fixedly installed on one of the movable seats 304. The rotating shaft of the third motor 204 is fixedly connected to one end of the rotating shaft 201 on the movable seat 304, and the rotating shaft 201 away from the third motor 204 is arranged in a tubular shape. A winding roller 9 is arranged between the two rotating shafts 201, and the winding roller 9 is arranged in a tubular shape. A plurality of air holes 901 are opened on the winding roller 9. One end of the two rotating shafts 201 is sealed and plugged into the two ends of the winding roller 9 respectively, and one end of the tubular rotating shaft 201 is connected to a connecting hose 703 through a rotary joint. A blower 701 is fixedly installed on the support plate 101, and the air inlet of the blower 701 is provided with an air inlet pipe 702. The air inlet pipe 702 is connected to a branch pipe, and the branch pipe is connected to one end of the connecting hose 703 away from the rotating shaft 201.

[0076] By adopting the above technical solution, when in use, the winding roller 9 is placed between the two rotating shafts 201, and then the first motor 302 is controlled to drive the first screw 303 to rotate clockwise, and then the two rotating shafts 201 are driven to move toward each other through the movable seat 304, so that one end of the rotating shaft 201 is sealed and inserted into the winding roller 9, and then the blower 701 is started, and the interior of the winding roller 9 is pumped into a negative pressure through the connecting hose 703, and then the end of the diaphragm to be wound is attached to the winding roller 9. At this time, the diaphragm is tightly adsorbed on the winding roller 9 by the negative pressure, and then the third motor 204 is started to drive the winding roller 9 to rotate, thereby completing the winding operation of the diaphragm;

[0077] After the diaphragm is wound, the blower 701 is turned off, and the first motor 302 is controlled to drive the first screw 303 to rotate counterclockwise, thereby driving the two rotating shafts 201 to move away from the winding roller 9 through the movable seat 304, and then the rotating shaft 201 is pulled out from the winding roller 9.

[0078] In this embodiment, the winding roller 9 is a hard paper winding tube.

[0079] In this embodiment, a limit plate 202 is provided on each of the two rotating shafts 201. The limit plate 202 is slidably mounted on the rotating shaft 201 through a material removal piece 203. The limit plate 202 can limit the diaphragm at both ends of the winding roller 9 to avoid deviation during winding.

[0080] When the cam 203 is in the state of being moved, the first spring 2032 is pressed against the limit plate 202 and the second spring 2033 is pressed against the limit plate 202, thereby preventing the cam 203 from being stuck on the rotating shaft 201 and the cam 2034 from being disassembled.

[0081] In this embodiment, a tightening mechanism 4 is provided on the support plate 101 through the pushing mechanism 6. The tightening mechanism 4 is used to tighten the wound diaphragm so that the diaphragm can be tightly wound on the winding roller 9.

[0082] The pushing mechanism 6 includes two vertical blocks 603, both of which are fixedly connected to the support plate 101, and a second screw rod 602 is rotatably installed between the two vertical blocks 603, a slide rail 604 is fixedly installed on the support plate 101, and a movable plate 608 is slidably installed on the slide rail 604 through a slider 6081, and a nut 6082 is fixedly installed at the bottom of the movable plate 608, and the nut 6082 is threadedly rotatably sleeved on the second screw rod 602, and a second motor 601 is fixedly installed at the bottom of one end of the support plate 101, and a first synchronous wheel 605 is fixedly connected to the rotating shaft of the second motor 601, and a second synchronous wheel 606 is fixedly connected to one end of the second screw rod 602, and the first synchronous wheel 605 and the second synchronous wheel 606 are connected by a synchronous belt 607;

[0083] The tightening mechanism 4 includes two arc-shaped plates 401, and a plurality of tightening rods 402 are arranged between the two arc-shaped plates 401. The bottom of the arc-shaped plate 401 is fixedly connected with an insertion rod 4012, and the lower end of the insertion rod 4012 slides through the movable plate 608. A second spring 4013 is sleeved on the insertion rod 4012, and the top of the second spring 4013 is pressed against the bottom of the arc-shaped plate 401, and the bottom of the second spring 4013 is pressed on the movable plate 608.

[0084] By cooperating with the second spring 4013 , the pressing rod 402 can perform a real-time pressing operation on the diaphragm on the winding roller 9 , thereby ensuring the winding strength of the diaphragm.

[0085] Through the provided pushing mechanism 6, after the diaphragm is wound, the winding roller 9 with the wound diaphragm can be disassembled and dropped onto the clamping mechanism 4, and then the second motor 601 is controlled to drive the second screw rod 602 to rotate, thereby moving the clamping mechanism 4 to the unloading position for rapid unloading.

[0086] In this embodiment, a limit member 8 is provided at the bottom of the support plate 101, which can prevent the pressing rod 402 from rising. Two strip holes 1011 are provided on the top of the support plate 101. The limit member 8 includes a cylinder 801. The piston rod end of the cylinder 801 is fixedly connected to the limit slide 802. The bottoms of both ends of the two arc-shaped plates 401 are fixedly connected with guide columns 4011. The lower end of the guide column 4011 slides through the movable plate 608 and then passes out from the bottom of the strip hole 1011. A limit notch 40111 is provided on the inner side of the guide column 4011. The limit slide 802 can extend into the limit notch 40111, and the limit notch 40111 is in sliding contact with the limit slide 802.

[0087] Through this setting, when the winding roller 9 is in the process of winding the diaphragm, the diaphragm on the winding roller 9 is gradually wound more, and then the guide column 4011 is squeezed downward. When the diaphragm is finished winding, the piston rod of the control cylinder 801 is extended, and then the limiting slide 802 is pushed into the limiting notch 40111 to limit the guide column 4011, and then the second motor 601 is controlled to drive the second screw rod 602 to rotate, and then the clamping mechanism 4 is moved to the unloading position for fast unloading. During this process, the guide column 4011 is always in a state of being limited by the limiting slide 802, and then the worker presses the clamping mechanism 4 is removed. At this time, because the guide column 4011 is limited by the limiting slide 802, the clamping rod 402 will not rise under the elastic force of the second spring 4013. When the winding roller 9 on the clamping mechanism 4 is removed, the second motor 601 is controlled to drive the clamping mechanism 4 to move in the direction of the winding assembly 2 and reset, and then the piston rod of the cylinder 801 is controlled to retract, and then the limiting slide 802 is pulled out from the limiting notch 40111. At this time, the limit on the guide column 4011 is released, and then the clamping rod 402 is pressed against the bottom of the new winding roller 9 under the elastic force of the second spring 4013.

[0088] In order to ensure the smooth movement of the limiting slide 802, one end of the limiting slide 802 is fixedly connected to the limiting plug 804, and the bottom of the support plate 101 is fixedly connected to the sliding sleeve 803, and the end of the limiting plug 804 away from the limiting slide 802 is slidably inserted into the sliding sleeve 803.

[0089] In this embodiment, a cooling mechanism 7 for air cooling the diaphragm is provided on the support frame 1. The cooling mechanism 7 includes a transverse tube 705. The transverse tube 705 is fixedly mounted on the support frame 1 through a mounting block 704. The lower end of the transverse tube 705 is provided with a plurality of nozzles 706 in a linear equidistant array. One end of the transverse tube 705 is connected to the air outlet of the blower 701 through an air supply pipe 707. Through this arrangement, the cooling operation can be performed again before the diaphragm is rolled up.

[0090] In order to facilitate the slitting of the diaphragm, a cutting mechanism 5 is provided on the support frame 1. The cutting mechanism 5 is arranged between the winding assembly 2 and the cooling mechanism 7. The cutting mechanism 5 includes a linear module 501. The linear module 501 is fixedly installed on the upper end of the support frame 1. A cutter 502 is fixedly installed on the slide of the linear module 501. When the diaphragm needs to be cut, the linear module 501 is controlled to drive the cutter 502 to move, and the diaphragm is quickly cut by the cutter 502.

[0091] This embodiment also provides a high-performance zinc-bromine liquid flow battery diaphragm, which is prepared using the above-mentioned method for preparing a high-performance zinc-bromine liquid flow battery diaphragm.

[0092] Parts not described in the present invention are the same as those in the prior art or can be implemented using the prior art. Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for preparing a high-performance zinc-bromine flow battery diaphragm, characterized in that: The following steps are involved: S1. Preparation of base film: 50-80 parts by weight of polylactic acid, 10-30 parts of silicon dioxide, and 10-30 parts of aluminum oxide are added into a mixer and mixed evenly for copolymerization and modification. The mixture is then fed into an extruder for extrusion and cutting to obtain base film particles. S2, the base film particles are fed into a twin-screw extruder and extruded into a film at 200°C. The extruded film is fed into a tape casting machine. The thickness of the film flowing out of the tape casting machine is 50 μm. S3, the film is sent to a biaxial stretching machine for longitudinal and transverse stretching, with a longitudinal and transverse stretching ratio of 1.5:1 and a stretching temperature of 120°C; S4. The stretched film is fed into a coating machine, where an ion conductive layer and a hydrophobic layer are coated on both sides of the film, respectively. The thickness of the ion conductive layer and the hydrophobic layer are both 5-10 μm. S5, sending the coated diaphragm into a heat treatment furnace, and heat-treating and curing it at 120° C. to form a diaphragm; S6. The solidified diaphragm is sent to the winding device for winding; The winding device comprises: a support frame (1), a support plate (101) being fixedly mounted on one end of the support frame (1); a clamping mechanism (3) being provided on the support plate (101), and a winding assembly (2) being provided on the clamping mechanism (3); the clamping mechanism (3) comprising two vertical plates (301), a first screw rod (303), a movable seat (304), a first motor (302), and a guide rod (305); The winding assembly (2) includes two rotating shafts (201), the two rotating shafts (201) are respectively rotatably connected to the corresponding moving seats (304), a third motor (204) is fixedly installed on one of the moving seats (304), the rotating shaft of the third motor (204) is fixedly connected to one end of the rotating shaft (201) on the moving seat (304), the rotating shaft (201) away from the third motor (204) is arranged in a tubular shape, and a winding roller (9) is arranged between the two rotating shafts (201), and the winding roller (9) is arranged in a tubular shape. A plurality of air holes (901) are provided on the winding roller (9), one end of the two rotating shafts (201) are sealed and plugged into the two ends of the winding roller (9), one end of the tubular rotating shaft (201) is connected to a connecting hose (703) through a rotary joint, a blower (701) is fixedly mounted on the support plate (101), an air inlet of the blower (701) is provided with an air inlet pipe (702), the air inlet pipe (702) is connected to a branch pipe, and the branch pipe is connected to an end of the connecting hose (703) away from the rotating shaft (201); A pressing mechanism (4) is provided on the support plate (101) through the pushing mechanism (6), and the pressing mechanism (4) is used to press the wound diaphragm so that the diaphragm can be tightly wound on the winding roller (9); the pressing mechanism (4) includes two arc-shaped plates (401), and a plurality of pressing rods (402) are provided between the two arc-shaped plates (401). The bottom of the arc-shaped plate (401) is fixedly connected to an insertion rod (4012), and the lower end of the insertion rod (4012) slides through the movable plate (6). 08) is provided, a second spring (4013) is sleeved on the insertion rod (4012), the top of the second spring (4013) is against the bottom of the arc plate (401), and the bottom of the second spring (4013) is pressed on the movable plate (608); a limiter (8) is provided at the bottom of the support plate (101) to prevent the pressing rod (402) from rising; a cooling mechanism (7) for air cooling the diaphragm is provided on the support frame (1); and a cutting mechanism (5) is provided on the support frame (1).

2. The method for preparing a high-performance zinc-bromine flow battery diaphragm according to claim 1, wherein: The two vertical plates (301) are both fixedly mounted on the support frame support plate (101), a first screw rod (303) is rotatably connected between the two vertical plates (301), the threads at both ends of the first screw rod (303) are arranged in opposite directions, and both ends of the first screw rod (303) are rotatably connected to a movable seat (304), a first motor (302) is fixedly mounted on one side of one of the vertical plates (301), a rotating shaft of the first motor (302) is fixedly connected to one end of the first motor (302), a guide rod (305) is fixedly connected between the two vertical plates (301), and the movable seat (304) is slidably sleeved on the guide rod (305).

3. The method for preparing a high-performance zinc-bromine flow battery diaphragm according to claim 2, wherein: A limiting disk (202) is provided on each of the two rotating shafts (201), and the limiting disk (202) is slidably sleeved on the rotating shaft (201) via a material stripping piece (203).

4. The method for preparing a high-performance zinc-bromine flow battery diaphragm according to claim 3, wherein: The material stripping member (203) comprises a telescopic rod (2031), a first spring (2032) and a fixed plate (2033); the fixed plate (2033) is fixedly sleeved on one end of the rotating shaft (201) close to the movable seat (304); one end of the telescopic rod (2031) is fixedly connected to one side of the limiting plate (202); the other end of the telescopic rod (2031) is fixedly connected to one end of the fixed plate (2033); the first spring (2032) is sleeved on the telescopic rod (2031); one end of the first spring (2032) abuts against one side of the limiting plate (202); and the other end of the first spring (2032) abuts against one side of the fixed plate (2033).

5. The method for preparing a high-performance zinc-bromine flow battery diaphragm according to claim 4, characterized in that: The pushing mechanism (6) comprises two upright blocks (603), both of which are fixedly connected to the support plate (101), a second screw rod (602) is rotatably installed between the two upright blocks (603), a slide rail (604) is fixedly installed on the support plate (101), a movable plate (608) is slidably installed on the slide rail (604) via a slider (6081), a nut (6082) is fixedly installed at the bottom of the movable plate (608), and the nut (6082) is threadedly rotatably sleeved on the second screw rod (602), a second motor (601) is fixedly installed at the bottom of one end of the support plate (101), a first synchronous wheel (605) is fixedly connected to the rotating shaft of the second motor (601), a second synchronous wheel (606) is fixedly connected to one end of the second screw rod (602), and the first synchronous wheel (605) and the second synchronous wheel (606) are connected to each other through a synchronous belt (607).

6. The method for preparing a high-performance zinc-bromine flow battery diaphragm according to claim 5, characterized in that: Two strip holes (1011) are provided on the top of the support plate (101), the limiting member (8) includes a cylinder (801), the piston rod end of the cylinder (801) is fixedly connected to a limiting slide bar (802), and the bottoms of both ends of the two arc-shaped plates (401) are fixedly connected to guide columns (4011), the lower ends of the guide columns (4011) slide through the movable plate (608) and then pass out from the bottom of the strip holes (1011), and a limiting notch (40111) is provided on the inner side of the guide column (4011), and the limiting slide bar (802) can extend into the limiting notch (40111), and the limiting notch (40111) is in sliding contact with the limiting slide bar (802).

7. The method for preparing a high-performance zinc-bromine flow battery diaphragm according to claim 6, characterized in that: One end of the limiting slide bar (802) is fixedly connected to the limiting plug rod (804), the bottom of the support plate (101) is fixedly connected to a sliding sleeve (803), and one end of the limiting plug rod (804) away from the limiting slide bar (802) is slidably inserted into the sliding sleeve (803).

8. The method for preparing a high-performance zinc-bromine flow battery diaphragm according to claim 7, characterized in that: The cooling mechanism (7) includes a transverse tube (705), which is fixedly mounted on the support frame (1) via a mounting block (704), and a plurality of nozzles (706) are arranged in a linear equidistant array at the lower end of the transverse tube (705), and one end of the transverse tube (705) is connected to the air outlet of the blower (701) via an air supply pipe (707).

9. The method for preparing a high-performance zinc-bromine flow battery diaphragm according to claim 8, characterized in that: The cutting mechanism (5) is arranged between the winding assembly (2) and the cooling mechanism (7), and the cutting mechanism (5) comprises a linear module (501), wherein the linear module (501) is fixedly mounted on the upper end of the support frame (1), and a cutter (502) is fixedly mounted on the slide of the linear module (501).

10. A high-performance zinc-bromine flow battery separator, characterized in that: The high-performance zinc-bromine flow battery diaphragm is prepared by the method for preparing the diaphragm for the high-performance zinc-bromine flow battery according to any one of claims 1 to 9.

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