Diaphragm for high-performance zinc-bromine flow battery and preparation method of diaphragm

Abstract

The invention discloses a diaphragm for a high-performance zinc-bromine flow battery and a preparation method of the diaphragm. The preparation method comprises the following steps: S1, preparing a base membrane; s2, the base film particles are fed into a double-screw extruder and extruded into a film at the temperature of 200 DEG C, the extruded film is fed into a tape casting forming machine, and the thickness of the film flowing out of the tape casting forming machine is 50 micrometers; s3, the thin film is fed into a two-way stretching machine to be longitudinally and transversely stretched, and the stretching temperature is 120 DEG C; s4, the stretched thin film is fed into a coating machine, the two sides of the thin film are coated with an ion conduction layer and a hydrophobic layer respectively, and the thickness of the ion conduction layer and the thickness of the hydrophobic layer are both 5-10 microns; s5, feeding the coated diaphragm into a heat treatment furnace, and performing heat treatment and curing treatment at 120 DEG C to form a diaphragm; s6, the cured diaphragm is fed into a winding device to be wound, and the diaphragm for the zinc-bromine flow battery is formed by compounding the bio-based degradable polymer and the high-temperature-resistant inorganic nanoparticles, so that the diaphragm has the characteristic of degradability on the premise that the diaphragm has high performance and high temperature resistance.

Description

Technical Field

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

[0002] With the transformation of the global energy structure and the rapid development of renewable energy, efficient, safe and environmentally friendly energy storage technology has become a hot topic in research. As a potential energy storage device, the performance improvement and cost reduction of zinc-bromine flow batteries have become the key to current research. Among them, the diaphragm, as an important component of zinc-bromine flow batteries, has a crucial impact on the performance and life of the battery.

[0003] At present, the commonly used diaphragm materials for zinc-bromine flow batteries mainly include polyolefins (such as polyethylene PE, polypropylene PP) and fluorinated polymers (such as polytetrafluoroethylene PTFE). Although these materials meet the basic needs of batteries to a certain extent, they have limitations in biodegradability. These materials are difficult to decompose in the natural environment, causing long-term pollution to the environment.

[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 carry out 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, and when the connecting shaft rotates, the upper and lower rotating shafts and two cleaning rollers are driven to rotate together through a linkage mechanism, and the upper and lower surfaces of the diaphragm can be cleaned at the same time through the rotation of the two cleaning rollers, and impurities and dust adhered to the diaphragm during the transportation process can be cleaned, which can greatly improve the winding quality of the diaphragm, and thus can 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 for several turns to ensure that the winding roller can normally carry out 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, base film preparation, by weight, taking 50-80 parts of polylactic acid, 10-30 parts of silicon dioxide, and 10-30 parts of aluminum oxide, putting the above components into a mixer and mixing them evenly, performing copolymerization modification, and then sending them 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, extruded into a film at 200°C, and the extruded film is fed into a tape-casting machine. The film thickness of the tape-casting machine is 50 μm;

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

[0013] S4, the stretched film is sent to a coating machine, and an ion conductive layer and a hydrophobic layer are coated on both sides of the film, respectively, and 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, heat-treating and curing it at 120° C. to form a diaphragm;

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

[0016] In a 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 comprises 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, both ends of the first screw rod are threadedly rotatably connected to a moving 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 moving 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 moving seats respectively, wherein a third motor is fixedly installed on one of the moving seats, and the rotating shaft of the third motor is fixedly connected to one end of the rotating shaft on the moving 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, and 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 rotating shaft arranged in a tubular shape is connected to a connecting hose through a rotating joint, and a blower is fixedly installed on the support plate, and the air inlet of the blower is provided with an air inlet pipe, and the air inlet pipe is connected to a branch pipe, and the branch pipe is connected to one end of the connecting hose away from the rotating shaft.

[0021] In a method for preparing a high-performance zinc-bromine liquid flow battery diaphragm according to the present invention, optionally, limit plates are provided on both of the two rotating shafts, and the limit plates 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 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, 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 a material 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 comprises two vertical blocks, both of which are 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, a movable plate is slidably installed on the slide rail through a slider, a nut is fixedly installed at the bottom of the movable plate, and the nut is threadably sleeved on the second screw rod, a second motor is fixedly installed at the bottom of one end of the support plate, a first synchronous wheel is fixedly connected to the rotating shaft of the second motor, a second synchronous wheel is fixedly connected to one end of the second screw rod, and the first synchronous wheel and the second synchronous wheel are connected through a synchronous belt transmission;

[0025] The clamping mechanism includes two arc-shaped plates, and a plurality of clamping 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 against the movable plate.

[0026] In a method for preparing a diaphragm for a high-performance zinc-bromine flow battery according to the present invention, optionally, a limit piece capable of preventing the clamping 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 comprises 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 guide columns, 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 diaphragm for a high-performance zinc-bromine flow battery according to the present invention, optionally, one end of the limiting slide rod is fixedly connected to a limiting plug rod, the bottom of the support plate is fixedly connected to a sliding sleeve, and one end of the limiting plug rod away from the limiting slide 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 comprises a transverse tube, and the transverse tube is fixedly mounted on the support frame through 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 through 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, the cutting mechanism is provided between the winding assembly and the cooling mechanism, the cutting mechanism comprises a linear module, 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 high-performance zinc-bromine liquid flow battery diaphragm preparation method.

[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 formed by a composite of 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.

[0033] By setting the winding assembly in cooperation with the winding roller and the blower, it is possible to start the blower when winding the diaphragm, so that negative pressure is formed inside the winding roller, and then one end of the diaphragm to be wound is attached to the winding roller, and then the third motor is started to quickly wind the diaphragm around the winding roller, which effectively improves 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, so as to achieve rapid disassembly of the winding roller and improve the replacement efficiency of the winding roller. Moreover, the clamping mechanism can clamp the winding roller of any size, so as to achieve 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 rolled diaphragm can be sent to the unloading place with the help of the pushing mechanism, which is convenient for workers to unload materials and to quickly 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 rolled-up diaphragm, thereby preventing the temperature of the rolled-up diaphragm from 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 of the present invention;

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

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

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

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

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

[0043] Figure 7 It is a structural schematic diagram of a tightening mechanism in a method for preparing a high-performance zinc-bromine liquid flow battery diaphragm of 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] Fig. 9 for Figure 8 A schematic diagram of the enlarged structure of part B in FIG.

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

[0047] Fig.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-shaped plate; 4011. guide column; 40111. limiting notch; 4012. insertion rod; 4013. second spring;

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

[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. Sliding block; 6082. Nut;

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

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

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

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

[0058] Among them, the drawings are only used for illustrative explanations, and they only represent schematic diagrams rather than actual pictures, and should not be understood as limitations on 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", "inner", "outer", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated 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 a limitation on 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 clearly specified and limited, if the term "connection" or the like appears to indicate the connection relationship between components, the 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 the internal connection of two components or the interaction relationship between two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to 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, base film preparation, by weight, taking 50-80 parts of polylactic acid, 10-30 parts of silicon dioxide, and 10-30 parts of aluminum oxide, putting the above components into a mixer and mixing them evenly, performing copolymerization modification, and then sending them 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, extruded into a film at 200°C, and the extruded film is fed into a tape-casting machine. The film thickness of the tape-casting machine is 50 μm;

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

[0066] S4, the stretched film is sent to a coating machine, and an ion conductive layer and a hydrophobic layer are coated on both sides of the film, respectively, and 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, heat-treating and curing it at 120° C. to form a diaphragm;

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

[0069] In step S1, in order to ensure that the base film raw materials are mixed evenly, a mixing uniformity model can be established. This model can evaluate the mixing effect by calculating the distribution differences between different components. For example, the following formula can be used to express the mixing uniformity (U):

[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 comprises: a support frame 1, a support plate 101 is fixedly mounted on one end of the support frame 1, a clamping mechanism 3 is arranged on the support plate 101, and a winding assembly 2 is arranged 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 threadedly rotatably connected to a moving 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, and the moving seat 304 is slidably sleeved on the guide rod 305;

[0075] Among them, the winding component 2 includes two rotating shafts 201, and the two rotating shafts 201 are respectively rotatably connected to the corresponding moving seats 304, and a third motor 204 is fixedly installed on one of the moving seats 304, and the rotating shaft of the third motor 204 is fixedly connected to one end of the rotating shaft 201 on the moving seat 304, and 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. The winding roller 9 is arranged in a tubular shape, and a plurality of air holes 901 are opened on the winding roller 9. One ends of the two rotating shafts 201 are respectively sealed and plugged into the two ends of the winding roller 9, and one end of the tubular rotating shaft 201 is connected to a connecting hose 703 through a rotating joint, and a blower 701 is fixedly installed on the support plate 101, and an air inlet pipe 702 is arranged at the air inlet of the blower 701, and 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 rod 303 to rotate clockwise, and then the two rotating shafts 201 are driven to move toward each other through the moving 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 inside 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 membrane is rolled up, 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 moving 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, limit plates 202 are provided on both rotating shafts 201. The limit plates 202 are slidably mounted on the rotating shafts 201 through the material removal parts 203. The limit plates 202 can limit the diaphragms at both ends of the winding roller 9 to avoid deviation during winding.

[0080] The first spring 2032 is disposed on the telescopic rod 2031, and one end of the first spring 2032 is against one side of the limiting plate 202, and the other end of the first spring 2032 is against one side of the fixing plate 2033. Through the arrangement of the material stripping piece 203, when the winding roller 9 is disassembled, when the two rotating shafts 201 move in the direction away from the winding roller 9, the first spring 2032 squeezes the limiting plate 202, and then the limiting plate 202 squeezes the winding roller 9, so as to avoid the winding roller 9 being stuck on the rotating shaft 201 and ensure stable disassembly.

[0081] In this embodiment, a tightening mechanism 4 is provided on the support plate 101 through the pushing mechanism 6, and 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, 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, a movable plate 608 is slidably installed on the slide rail 604 through 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 through a synchronous belt 607.

[0083] The clamping mechanism 4 includes two arc-shaped plates 401, and a plurality of clamping 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 membrane is rolled up, the winding roller 9 with the membrane rolled up can be removed 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 location for rapid unloading.

[0086] In this embodiment, a limit piece 8 capable of preventing the clamping rod 402 from rising is provided at the bottom of the support plate 101. Two strip holes 1011 are provided at the top of the support plate 101. The limit piece 8 includes a cylinder 801. The piston rod end of the cylinder 801 is fixedly connected to a limit slide bar 802. The bottoms of both ends of the two arc-shaped plates 401 are fixedly connected to 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 bar 802 can extend into the limit notch 40111. The limit notch 40111 is in sliding contact with the limit slide bar 802.

[0087] With this arrangement, 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 more, thereby squeezing the guide column 4011 downward. When the diaphragm is completely wound, the piston rod of the control cylinder 801 is extended, thereby pushing the limiting slide bar 802 into the limiting notch 40111 to limit the guide column 4011, and then controlling the second motor 601 to drive the second screw rod 602 to rotate, thereby moving the clamping mechanism 4 to the unloading position for rapid unloading. During this process, the guide column 4011 is always in a state of being limited by the limiting slide bar 802, and then the worker presses the clamping mechanism 4, the wound diaphragm is removed. At this time, because the guide column 4011 is limited by the limiting slide bar 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 and reset in the direction of the winding assembly 2, and then the piston rod of the cylinder 801 is controlled to retract, and then the limiting slide bar 802 is pulled out of 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 bar 802, 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 the sliding sleeve 803, and the end of the limiting plug rod 804 away from the limiting slide bar 802 is slidably inserted in the sliding sleeve 803.

[0089] In this embodiment, a cooling mechanism 7 for air cooling the diaphragm is provided on the support frame 1, and the cooling mechanism 7 includes a transverse tube 705, and the transverse tube 705 is fixedly installed 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, and 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 by the above-mentioned high-performance zinc-bromine liquid flow battery diaphragm preparation method.

[0092] Parts not involved in the present invention are the same as the prior art or can be implemented by the prior art. Although the embodiments of the present invention have been shown and described, it is understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and 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, base film preparation, by weight, taking 50-80 parts of polylactic acid, 10-30 parts of silicon dioxide, and 10-30 parts of aluminum oxide, putting the above components into a mixer and mixing them evenly, performing copolymerization modification, and then sending them into an extruder for extrusion and cutting to obtain base film particles; S2, the base film particles are fed into a twin-screw extruder, extruded into a film at 200°C, and the extruded film is fed into a tape-casting machine. The film thickness of the tape-casting machine is 50 μm; S3, the film is sent to a biaxial stretching machine for longitudinal and transverse stretching, the longitudinal and transverse stretching ratio is 1.5:1, and the stretching temperature is 120°C; S4, the stretched film is sent to a coating machine, and an ion conductive layer and a hydrophobic layer are coated on both sides of the film, respectively, and 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, heat-treating and curing it at 120° C. to form a diaphragm; S6. The cured diaphragm is sent to a winding device for winding.

2. The method for preparing a high-performance zinc-bromine flow battery diaphragm according to claim 1, characterized in that: The winding device comprises: A support frame (1), wherein a support plate (101) is fixedly mounted on one end of the support frame (1); The support plate (101) is provided with a clamping mechanism (3), and the clamping mechanism (3) is provided with a winding assembly (2); The clamping mechanism (3) comprises two vertical plates (301), the two vertical plates (301) are fixedly mounted on the support plate (101) of the support frame, 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 threadedly rotatably connected to a moving 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 moving seat (304) is slidably sleeved on the guide rod (305); The winding assembly (2) comprises 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 mounted 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, a winding roller (9) is arranged between the two rotating shafts (201), and the winding roller (9) is arranged in a tubular shape. The winding roller (9) is provided with a plurality of air holes (901), one end of the two rotating shafts (201) are respectively sealed and plugged into the two ends of the winding roller (9), one end of the rotating shaft (201) arranged in a tubular shape is connected to a connecting hose (703) via a rotating 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 one end of the connecting hose (703) away from the rotating shaft (201).

3. A method for preparing a high-performance zinc-bromine flow battery diaphragm according to claim 2, characterized in that: A limit plate (202) is provided on each of the two rotating shafts (201), and the limit plate (202) is slidably mounted on the rotating shaft (201) via a material stripping member (203).

4. The method for preparing a high-performance zinc-bromine flow battery diaphragm according to claim 3, characterized in that: 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 support plate (101) is provided with a tightening mechanism (4) through a material pushing mechanism (6), and the tightening mechanism (4) is used to tighten the wound diaphragm so that the diaphragm can be tightly wound on the winding roller (9); 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 mounted between the two upright blocks (603), a slide rail (604) is fixedly mounted on the support plate (101), a movable plate (608) is slidably mounted on the slide rail (604) via a slider (6081), and a nut (6082) is fixedly mounted on the bottom of the movable plate (608), The nut (6082) is threadably sleeved on the second screw rod (602); a second motor (601) is fixedly mounted on 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); the first synchronous wheel (605) and the second synchronous wheel (606) are connected by a synchronous belt (607); The clamping mechanism (4) comprises two arc-shaped plates (401), a plurality of clamping rods (402) are arranged between the two arc-shaped plates (401), an insertion rod (4012) is fixedly connected to the bottom of the arc-shaped plate (401), 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), 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).

6. A method for preparing a high-performance zinc-bromine flow battery diaphragm according to claim 5, characterized in that: A limiting member (8) capable of preventing the pressing rod (402) from rising is arranged at the bottom of the support plate (101), two strip holes (1011) are arranged at the top of the support plate (101), the limiting member (8) comprises a cylinder (801), the piston rod end of the cylinder (801) is fixedly connected to a limiting slide bar (802), 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 hole (1011), a limiting notch (40111) is arranged on the inner side of the guide column (4011), 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. A method for preparing a high-performance zinc-bromine flow battery diaphragm according to claim 6, characterized in that: One end of the limiting sliding rod (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 sliding rod (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 support frame (1) is provided with a cooling mechanism (7) for air cooling the diaphragm, and the cooling mechanism (7) includes a transverse tube (705), and the transverse tube (705) is fixedly mounted on the support frame (1) through a mounting block (704), and the lower end of the transverse tube (705) is provided with a plurality of nozzles (706) in a linear equidistant array, and one end of the transverse tube (705) is connected to the air outlet of the blower (701) through 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 support frame (1) is provided with a cutting mechanism (5), the cutting mechanism (5) being arranged between the winding assembly (2) and the cooling mechanism (7), the cutting mechanism (5) comprising a linear module (501), the linear module (501) being fixedly mounted on the upper end of the support frame (1), and a cutter (502) being fixedly mounted on the slide of the linear module (501).

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

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