A full tab wrap film capacitive deionization device and method of manufacture

Abstract

The application relates to the technical field of membrane capacitive deionization, in particular to a full-tab winding type membrane capacitive deionization device and a manufacturing method. A membrane core is wound by a flow guide screen, a negative ion membrane, a positive electrode flexible electrode, a negative ion membrane, a flow guide screen, a positive ion membrane, a negative electrode flexible electrode, a positive ion membrane in sequence, one side of the flexible electrode is provided with a full tab, a center pipe with a hole is arranged in the middle of the membrane core, both ends of the membrane core are closed, a current collecting disc is arranged outside both ends of the membrane core, both ends of the full tab outside the membrane core are in contact with the current collecting disc, at least one end of the center pipe is out of the current collecting disc, the current collecting disc is provided with a wiring terminal, both ends of the membrane core are sealed with the shell, and an interface is arranged on the outer circle of the shell. Compared with the prior art, the structure of the full tab is arranged to make the side surface of the flexible electrode in overall contact with the current collecting disc for conducting electricity, the electron transmission path can be effectively shortened, and the efficiency of capacitive deionization is improved; the electrode is isolated from water in a packaging and sealing mode, and the water safety is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of membrane capacitor deionization technology, specifically to a omnipolar loop-wound membrane capacitor deionization device and its manufacturing method. Background Technology

[0002] Capacitive deionization technology is a treatment technology that utilizes a double-layer structure on the electrode surface to adsorb and remove charged particles such as anions and cations from water. Its main structures are flat-plate and wound-type. Compared to flat-plate, wound-type capacitive deionization devices have advantages such as simple structure, convenient assembly, uniform water distribution, and low manufacturing cost. In existing technologies, such as the wound-type capacitive deionization device disclosed in publication number CN108203192A, positive and negative terminals are directly connected to the electrode plates on the membrane shell. This results in a long electron transmission path, high energy loss, and excessively long capacitor charging and discharging times, affecting the efficiency of capacitive deionization. Summary of the Invention

[0003] To overcome the shortcomings of the prior art, the present invention provides a full-ear wound membrane capacitor deionization device.

[0004] To achieve the above objectives, a full-tab wound membrane capacitor deionization device is designed. The membrane core is disposed inside the outer shell and includes a current-guiding mesh, an ion-exchange membrane, and a flexible electrode. The ion-exchange membrane includes a cation membrane and an anion membrane, and the flexible electrode includes an anode flexible electrode and a cathode flexible electrode. The membrane core is formed by winding the current-guiding mesh, anion membrane, anode flexible electrode, anion membrane, current-guiding mesh, cation membrane, cathode flexible electrode, and cation membrane in sequence. A full tab is provided on one side of the flexible electrode. The full tabs of the anode flexible electrode and the cathode flexible electrode are oriented in opposite directions. A central tube with holes is provided in the middle of the membrane core. The two ends of the membrane core are closed, and current collectors are provided outside the two ends of the membrane core. The full tabs extend from both ends of the membrane core and contact the current collectors. At least one end of the central tube extends out of the current collector. The current collector is provided with a terminal block. The two ends of the membrane core are sealed to the outer shell, and the outer circle of the outer shell is provided with an interface.

[0005] Both ends of the membrane core are coated with sealant, and the tabs extend out of the sealant to contact the collector plate.

[0006] The outer two sides of the membrane core are wrapped with adhesive tape, and a sealing ring is provided between the adhesive tape and the outer shell.

[0007] The tab is a copper or aluminum foil attached to one side of the flexible electrode.

[0008] The outer side of the full electrode tab is serrated and pressed inward against the outer side of the sealant.

[0009] The current collector is a flexible conical conductive structure.

[0010] The substrate material of the flexible electrode is graphite paper, aluminum sheet, copper sheet or titanium sheet, and the double-sided coating of the flexible electrode is carbon nanotube, carbon black or graphene.

[0011] The membrane core is fixed with adhesive tape in the middle.

[0012] The outer casing is provided with caps at both ends, and at least one end of the central tube extends out of the cap. An adapter nut with a quick connector is installed at the end of the central tube that extends out of the cap.

[0013] The present invention also provides a method for manufacturing a full-tab wound film capacitor deionization device, comprising the following steps:

[0014] S1: A copper or aluminum foil is attached to one side of the flexible electrode as a full electrode tab, and the outer side of the copper or aluminum foil is cut into a serrated shape.

[0015] S2: Place the central tube on the film winding machine, and at the same time place a roll of flow guide mesh on the film winding machine;

[0016] S3: Place membrane materials of a certain length in the following order: current-guiding mesh, anion membrane, anode flexible electrode, anion membrane, current-guiding mesh, cation membrane, cathode flexible electrode, and cation membrane. The tabs of the electrodes should extend beyond one side of the current-guiding mesh, anion membrane, and cation membrane. The tabs of the anode flexible electrode and the cathode flexible electrode should be arranged in opposite directions. Apply glue to both sides of the three layers of membrane (cation membrane, cathode flexible electrode, and cation membrane) and the three layers of membrane (anion membrane, anode flexible electrode, and anion membrane).

[0017] S4: Start the film winding machine, wind all the materials with the flow guide mesh, and then use the flow guide mesh to wrap all the film materials and cut the flow guide mesh.

[0018] S5: After the glue dries, press the serrated part of the total electrode from the outside of the membrane core to the inside to form a flower-shaped total electrode.

[0019] S6: Use filter tape to seal and fix the middle and both ends of the entire membrane material to form a membrane core;

[0020] S7: Install sealing rings on the outside of the filter tape on both sides, insert the membrane core into the outer shell, and press the sealing rings and the outer shell to seal.

[0021] S8: Insert the collector plate and the cap into both ends of the central tube of the membrane core, install the adapter nut on the outside of both ends of the central tube to press the collector plate and the full electrode tab to fix the entire device.

[0022] Compared with the prior art, this invention, by setting a structure with full tabs, allows the side of the flexible electrode to make contact with the current collector for conduction, which can effectively shorten the electron transport path and improve the efficiency of capacitor deionization; at the same time, by encapsulating and sealing the electrode to isolate it from water, water safety is ensured. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the present invention.

[0024] Figure 2 This is a schematic diagram of the winding structure.

[0025] Figure 3 This is a magnified view of a portion of the winding structure.

[0026] Figure 4 This is a schematic diagram of the end structure.

[0027] Figure 5 This is a schematic diagram of a flexible electrode.

[0028] See Figures 1-5 Among them, 1 is the membrane core, 1-1 is the current-guiding mesh, 1-2 is the anion exchange membrane, 1-3 is the flexible electrode, 1-3-1 is the anode flexible electrode, 1-3-2 is the cathode flexible electrode, 1-3-3 is the total electrode tab, 1-4 is the cation exchange membrane, 1-5 is the sealant, 1-6 is the central tube, 1-7 is the tape, 2 is the sealing ring, 3 is the outer shell, 4 is the cap, 5 is the collector plate, 6 is the terminal block, 7 is the adapter nut, and 8 is the interface. Detailed Implementation

[0029] The present invention will now be further described with reference to the accompanying drawings.

[0030] like Figures 1-5 As shown, the membrane core 1 is disposed within the outer casing 3. The membrane core 1 includes a flow-guiding mesh 1-1, an ion exchange membrane, and a flexible electrode 1-3. The ion exchange membrane includes a cation exchange membrane 1-4 and an anion exchange membrane 1-2. The flexible electrode 1-3 includes an anode flexible electrode 1-3-1 and a cathode flexible electrode 1-3-2. The membrane core 1 is formed by sequentially winding the flow-guiding mesh 1-1, the anion exchange membrane 1-2, the anode flexible electrode 1-3-1, the anion exchange membrane 1-2, the flow-guiding mesh 1-1, the cation exchange membrane 1-4, the cathode flexible electrode 1-3-2, and the cation exchange membrane 1-4. One side of electrode 1-3 is provided with a full electrode tab 1-3-3. The full electrode tabs 1-3-3 of the anode flexible electrode 1-3-1 and the cathode flexible electrode 1-3-2 are in opposite directions. A central tube 1-6 with holes is provided in the middle of the membrane core 1. The two ends of the membrane core 1 are closed. A current collector 5 is provided outside the two ends of the membrane core 1. The full electrode tab 1-3-3 extends out of the two ends of the membrane core 1 and contacts the current collector 5. At least one end of the central tube 1-6 extends out of the current collector 5. The current collector 5 is provided with a terminal block 6. The two ends of the membrane core 1 are sealed with the outer shell 3. An interface 8 is provided on the outer circle of the outer shell 3.

[0031] Both ends of the membrane core 1 are coated with sealant 1-5, and the tabs 1-3-3 extend out of the sealant 1-5 and contact the collector plate 5. The sealant 1-5 seals both ends of the membrane core 1, so that water flows only along the flow guide mesh 1-1 inside the membrane core 1 and will not flow from both ends to the tabs 1-3-3.

[0032] The outer sides of the membrane core 1 are wrapped with adhesive tape 1-7, and a sealing ring 2 is provided between the adhesive tape 1-7 and the outer shell 3. The adhesive tape 1-7 on both sides wraps around the end of the membrane core 1 to close the position, and the sealing ring 2 seals the two ends of the membrane core 1 with the outer shell 3. The interface 8 can be set between the sealing rings 2 at both ends to prevent water from flowing to the collection plate 5 and causing short circuit and water pollution.

[0033] The tab 1-3-3 is a copper or aluminum foil attached to one side of the flexible electrode 1-3. The copper or aluminum foil is easy to bend and provides good conductivity.

[0034] The outer side of the full-pole tab 1-3-3 is serrated and pressed inward against the outer side of the sealant 1-5. The serrated structure, when bent, forms a triangle or trapezoid, which can cover most of the area outside the sealant 1-5, increasing the contact area between the full-pole tab 1-3-3 and the current collector 5 and improving conductivity.

[0035] The current collector 5 has a conical conductive structure. The bottom surface of the cone can be pressed into contact with the full-face tab 1-3-3 for conductive contact. The current collector 5 can be die-cast from materials such as copper, aluminum, and titanium.

[0036] The substrate material of the flexible electrodes 1-3 is graphite paper, aluminum sheet, copper sheet, or titanium sheet. The double-sided coating of the flexible electrodes 1-3 is made of at least one of carbon nanotubes, carbon black, or graphene. Among them, carbon black and graphene can conduct electricity, while activated carbon and carbon nanotubes have a loose and porous structure, which can improve the adsorption effect of the electrodes.

[0037] Adhesive tape 1-7 is fixed in the middle of membrane core 1. Adhesive tape 1-7 is used to fix the membrane roll structure and can be a special filter cartridge fixing tape.

[0038] The outer casing 3 has caps 4 at both ends. At least one end of the central tube 1-6 extends out of the cap 4. The end of the central tube 1-6 extending out of the cap 4 is equipped with an adapter nut 7 with a quick connector. The adapter nut 7 presses against the cap 4, which can press the collector plate 5 to press the electrode ear 1-3-3, thus fixing the entire device. It also has a quick connector for easy connection to an external water pipe.

[0039] The omnipolar loop-wound membrane capacitor deionization device of the present invention can be manufactured by the following steps:

[0040] S1: Attach copper or aluminum foil to one side of the flexible electrode as a full electrode tab 1-3-3, and cut the outer side of the copper or aluminum foil into a serrated shape.

[0041] S2: Place the central tube on the film winding machine, and at the same time place a roll of flow guide net 1-1 on the film winding machine;

[0042] S3: Place membrane materials of a certain length in the following order: current-guiding mesh 1-1, anion membrane 1-2, anode flexible electrode 1-3-1, anion membrane 1-2, current-guiding mesh 1-1, cation membrane 1-4, cathode flexible electrode 1-3-2, and cation membrane 1-4. The tabs 1-3-3 extend beyond one side of the current-guiding mesh 1-1, anion membrane 1-2, and cation membrane 1-4. The tabs 1-3-3 of the anode flexible electrode 1-3-1 and the cathode flexible electrode 1-3-2 are set in opposite directions. Apply glue to both sides of the three membranes of cation membrane 1-4, cathode flexible electrode 1-3-2, and cation membrane 1-4, and the three membranes of anion membrane 1-2, anode flexible electrode 1-3-1, and anion membrane 1-2.

[0043] S4: Start the film winding machine, wind all the materials with the flow guide mesh 1-1, and then use the flow guide mesh 1-1 to wrap all the film materials and cut the flow guide mesh 1-1.

[0044] S5: After the glue dries, press the serrated part of the total tab 1-3-3 from the outside to the inside of the membrane core 1 to form a flower-shaped total tab 1-3-3;

[0045] S6: Use filter tape 1-7 to seal and fix the middle and both ends of the entire membrane material to form membrane core 1;

[0046] S7: Install sealing rings 2 on the outside of filter tapes 1-7 on both sides, insert membrane core 1 into housing 3, and seal sealing rings 2 and housing 3 by pressing them together.

[0047] S8: Insert the collector plate 5 and the cap 4 into both ends of the central tube of the membrane core. Install the adapter nut 7 on the outside of both ends of the central tube 1-6 to compact the collector plate 5 and the full electrode tab 1-3-3, and fix the entire device.

[0048] When this invention is used, water can enter the outer shell 3 through the interface 8, first stay and tumble outside the membrane core 1 to form turbulence, so that the ion concentration of the water is homogenized to a certain extent. Then, under pressure, it enters the membrane core 1 and flows along the flow guide mesh 1-1. The terminal 6 of the collector plate 5 outside the tab 1-3-3 of the anode flexible electrode 1-3-1 is positively charged, and the terminal 6 of the collector plate 5 outside the tab 1-3-3 of the cathode flexible electrode 1-3-2 is negatively charged, adsorbing anions and cations respectively. Finally, it enters the central tube 1-6 and flows out through the quick connector at the adapter nut 7 to the outlet pipe.

[0049] Membrane core 1 is formed by sequentially coating the flow-guiding mesh 1-1, anion exchange membrane 1-2, anode flexible electrode 1-3-1, anion exchange membrane 1-2, flow-guiding mesh 1-1, cation exchange membrane 1-4, cathode flexible electrode 1-3-2, and both sides of the cation exchange membrane 1-4 with sealant, stacking them, and winding them around the central tube 1-6. Utilizing the two sides of the anode and cathode electrodes, a circulating electric field of positive-negative, negative-positive, positive-negative, and negative-positive is formed inside membrane core 1. When water flows within the flow-guiding mesh 1-1, under the influence of the electric field generated by the flexible electrode, anions pass through the anion exchange membrane 1-2 and are adsorbed by the anode flexible electrode 1-3-1, while cations pass through the cation exchange membrane and are adsorbed by the cathode flexible electrode 1-3-2. Wrapping the flexible electrode with ion exchange membranes on both sides prevents the coating material of the flexible electrode from entering the water and avoids water contact with the electrode materials, especially graphite paper, thus improving drinking water safety. Filter tape 1-7 is wound around the sides and middle of membrane core 1 to fix it and prevent the membrane from loosening or expanding. The membrane core 1 has sealing rings 2 on the tape on both sides to prevent water from entering the collector plate 5 and the collector ears 1-3-3.

[0050] During winding, the flow-guiding mesh 1-1 connected to the central tube 1-6 is first wound around the central tube 1-5 1-2 times to form a water collection channel. The flow-guiding mesh 1-1, anion membrane 1-2, and cation membrane 1-4 in the membrane core 1 are cut to the same width. The flexible electrode is 1-4 cm wider than the ion membrane. When stacked, one side of the flexible electrode is recessed 2-5 mm into the flow-guiding mesh 1-1 and the ion membrane, while the other side protrudes to form the tab 1-3-3. The anode flexible electrode 1-3-1 and the cathode flexible electrode 1-3-2 are arranged in opposite directions. The part of the flexible electrode protruding from the ion membrane is left blank and not plated with active material. Double-sided conductive copper foil or aluminum foil is pasted into the blank area. The conductive copper foil or aluminum foil penetrates 2-5 mm into the anion membrane 1-2 or the cation membrane 1-4 to protect the flexible electrode.

[0051] Using the membrane capacitor deionization device of this invention, the tab 1-3-3 does not come into contact with water, allowing for a wider range of material choices. Especially in drinking water applications, traditional electrodes require metals such as titanium as current collectors. Under the same processing capacity, production costs can be significantly reduced. The sealing ring 2 isolates the electrode material from the water, ensuring drinking water safety. The tab 1-3-3 of this invention contacts the current collector 5 with a surface. Compared to traditional point or line contact electrodes, under the same electrode area, this reduces internal resistance by more than 50% and contact resistance by more than 30%, while shortening charging and discharging time by nearly 50%. Due to the reduction in internal resistance and contact resistance, the traditional 1.5-1.6V operating voltage can be reduced to 1.3-1.4V, effectively reducing energy loss due to heat generation.

Claims

1. A omnipolar loop-wound membrane capacitor deionization device, comprising a membrane core (1), characterized in that: The membrane core (1) is disposed inside the outer shell (3). The membrane core (1) includes a flow-guiding mesh (1-1), an ion membrane, and a flexible electrode (1-3). The ion membrane includes a cation membrane (1-4) and an anion membrane (1-2). The flexible electrode (1-3) includes an anode flexible electrode (1-3-1) and a cathode flexible electrode (1-3-2). The membrane core (1) is formed by winding the flow-guiding mesh (1-1), anion membrane (1-2), anode flexible electrode (1-3-1), anion membrane (1-2), flow-guiding mesh (1-1), cation membrane (1-4), cathode flexible electrode (1-3-2), and cation membrane (1-4) in sequence. -3) has a full tab (1-3-3) on one side. The full tabs (1-3-3) of the anode flexible electrode (1-3-1) and the cathode flexible electrode (1-3-2) are in opposite directions. The middle of the membrane core (1) has a central tube (1-6) with holes. The two ends of the membrane core (1) are closed. The two ends of the membrane core (1) are provided with a collector plate (5). The full tabs (1-3-3) extend out of the two ends of the membrane core (1) and contact the collector plate (5). At least one end of the central tube (1-6) extends out of the collector plate (5). The collector plate (5) is provided with a terminal (6). The two ends of the membrane core (1) are sealed with the outer shell (3). The outer circle of the outer shell (3) is provided with an interface (8).

2. The omnipolar loop-wound membrane capacitor deionization device according to claim 1, characterized in that: The membrane core (1) is coated with sealant (1-5) at both ends, and the tabs (1-3-3) extend out of the sealant (1-5) and contact the collector plate (5).

3. The omnipolar loop-wound membrane capacitor deionization device according to claim 1, characterized in that: The outer sides of the membrane core (1) are wrapped with tape (1-7), and a sealing ring (2) is provided between the tape (1-7) and the outer shell (3).

4. The omnipolar loop-wound membrane capacitor deionization device according to claim 1, characterized in that: The full electrode tab (1-3-3) is a copper or aluminum foil attached to one side of the flexible electrode (1-3).

5. The omnipolar loop-wound membrane capacitor deionization device according to claim 1, characterized in that: The outer side of the full electrode tab (1-3-3) is serrated and pressed inward against the outer side of the sealant (1-5).

6. The omnipolar loop-wound membrane capacitor deionization device according to claim 1, characterized in that: The current collector (5) is a conical conductive structure.

7. The omnipolar loop-wound membrane capacitor deionization device according to claim 1, characterized in that: The substrate material of the flexible electrode (1-3) is graphite paper, aluminum sheet, copper sheet or titanium sheet, and the double-sided coating of the flexible electrode (1-3) is made of at least one of carbon nanotubes, carbon black or graphene.

8. The omnipolar loop-wound membrane capacitor deionization device according to claim 1, characterized in that: The membrane core (1) is fixed with tape (1-7) in the middle.

9. The omnipolar loop-wound membrane capacitor deionization device according to claim 1, characterized in that: The outer casing (3) is provided with caps (4) at both ends, and at least one end of the central tube (1-6) extends out of the caps (4). The central tube (1-6) is equipped with an adapter nut (7) with a quick connector at the end extending out of the caps (4).

10. A method for manufacturing an all-electrode wound membrane capacitor deionization device according to any one of claims 1-9, characterized in that: Includes the following steps: S1: A copper foil or aluminum foil is attached to one side of the flexible electrode (1-3) as a full electrode tab (1-3-3), and the outer side of the copper foil or aluminum foil is cut into a serrated shape. S2: Place the central tube on the film winding machine, and at the same time place a roll of flow guide mesh (1-1) on the film winding machine; S3: Place membrane materials of a certain length in the following order: flow-guiding mesh (1-1), anion membrane (1-2), anode flexible electrode (1-3-1), anion membrane (1-2), flow-guiding mesh (1-1), cation membrane (1-4), cathode flexible electrode (1-3-2), and cation membrane (1-4). The tabs (1-3-3) extend beyond one side of the flow-guiding mesh (1-1), anion membrane (1-2), and cation membrane (1-4). The tabs (1-3-3) of the anode flexible electrode (1-3-1) and the cathode flexible electrode (1-3-2) are set in opposite directions. Apply glue to both sides of the three-layer membranes of cation membrane (1-4), cathode flexible electrode (1-3-2), and cation membrane (1-4), and the three-layer membranes of anion membrane (1-2), anode flexible electrode (1-3-1), and anion membrane (1-2). S4: Start the film winding machine, wind all the materials along with the flow guide mesh (1-1), and then use the flow guide mesh (1-1) to wind and cover all the film materials and cut the flow guide mesh (1-1). S5: After the glue dries, press the serrated part of the total tab (1-3-3) from the outside of the membrane core (1) to the inside to form a flower-shaped total tab (1-3-3). S6: Use filter tape (1-7) to seal and fix the middle and both ends of the entire membrane material to form a membrane core (1). S7: Install sealing rings (2) on the outside of the filter tapes (1-7) on both sides, put the membrane core (1) into the outer shell (3), and press the sealing rings (2) and the outer shell (3) together to seal. S8: Insert the collector plate (5) and the cap (4) into both ends of the central tube of the membrane core. Install the adapter nut (7) on the outside of both ends of the central tube (1-6) to compact the collector plate (5) and the full electrode tab (1-3-3) and fix the whole device.

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