Electrode arrangement for multiple membrane capacitive deionization electrode assemblies

Abstract

The present invention proposes an electrode arrangement for multiple membrane capacitive deionization electrode assemblies, comprising: an arrangement housing located on the periphery of the electrode arrangement and in the form of a cylindrical housing; an upper sealing plate and a lower sealing plate; the positive electrode conductive column and the negative electrode conductive column extend upwards from the bottom of the device shell respectively; a plurality of positive conducting strips and a plurality of negative conducting strips; a plurality of positive electrode pressurizing blocks and a plurality of negative electrode pressurizing blocks; each of the positive electrode pressurizing column and the plurality of negative electrode pressurizing columns comprises a base and a column body and is in an inverted T shape; the membrane capacitive deionization electrode assembly comprises a positive electrode, an anion exchange layer, a spacing net, a cation exchange layer and a negative electrode which are arranged in sequence and is arranged above the lower sealing plate, and a positive tab of the positive electrode penetrates through a positive pressurization column through a positive tab opening extending inwards from the edge of the positive tab; a negative electrode lug of the negative electrode penetrates through the negative electrode pressurizing column through a negative electrode lug opening extending inwards from the edge of the negative electrode lug and is powered by the positive electrode conductive column / negative electrode conductive column.

Description

Technical Field

[0001] The invention relates to capacitive deionization technology, and in particular to an electrode device for multiple membrane capacitive deionization electrode assemblies. Background Art

[0002] With the climate change caused by economic development, the problem of water shortage is becoming increasingly prominent. Desalination and water reuse have become more important. Traditional desalination technologies including electrodialysis (ED) and reverse osmosis (RO) have the disadvantages of high cost and high energy consumption, and are prone to scaling when treating high-hardness water, requiring frequent chemical cleaning and replacement of membrane components.

[0003] Membrane capacitive deionization (MCDI) is a new method for desalination of salt water. During the charging process, ions in the water migrate in a directional manner under the action of the electric field and are adsorbed and stored on the electrodes, thereby achieving the purpose of desalination; during the discharge process, ions are desorbed from the electrodes to achieve electrode regeneration without the need to add chemical agents. Summary of the invention

[0004] The present invention proposes a new electrode device for multiple membrane capacitor deionization electrode assemblies, so as to better arrange the electrode assembly structure and help increase the water treatment capacity.

[0005] The present invention provides an electrode device for multiple membrane capacitor deionization electrode assemblies, the electrode device comprising:

[0006] A device housing, the device housing is located outside the electrode device and is in the form of a cylindrical shell, and the device housing has watertight performance;

[0007] An upper sealing plate, the upper sealing plate is located above the device housing and covers the upper opening of the device housing, the upper sealing plate includes a water outlet hole;

[0008] A lower sealing plate, the lower sealing plate is located below the device housing and covers a lower opening of the device housing, the lower sealing plate includes a water inlet hole;

[0009] A positive conductive column, the positive conductive column extending upward from the bottom of the device housing, passing through the membrane capacitor deionization electrode assembly, and extending through the upper sealing plate;

[0010] A negative electrode conductive column, the negative electrode conductive column extends upward from the bottom of the device housing, passes through the membrane capacitor deionization electrode assembly, and extends out through the upper sealing plate;

[0011] A plurality of positive electrode conductive sheets, each of which is fixedly connected to the positive electrode conductive column and directly or indirectly contacts the positive electrode tab extending outward from one side of the positive electrode of the membrane capacitor deionization electrode assembly to conduct electricity;

[0012] A plurality of negative electrode conductive sheets, each of which is fixedly connected to the negative electrode conductive column and directly or indirectly contacts the negative electrode tab extending outward from one side of the negative electrode of the membrane capacitor deionization electrode assembly to conduct electricity;

[0013] A plurality of positive electrode pressure blocks, wherein the positive electrode pressure blocks are located between the plurality of positive electrode conductive sheets to help maintain the positions of the plurality of positive electrode conductive sheets and the plurality of positive electrode tabs above and below the positive electrode pressure blocks;

[0014] A plurality of negative electrode pressure blocks, wherein the negative electrode pressure blocks are located between the plurality of negative electrode conductive sheets to help maintain the positions of the plurality of negative electrode conductive sheets and the plurality of negative electrode tabs above and below the negative electrode pressure blocks;

[0015] A positive pressure column, the positive pressure column comprising a base and a column, in an inverted "T" shape, the base being arranged above the lower sealing plate, the positive pressure column passing through the plurality of positive pressure blocks, the plurality of positive conductive sheets and the plurality of positive tabs, and being fastened by a fastening mechanism located on the uppermost positive tab to fix the positions of the plurality of positive conductive sheets and the plurality of positive tabs;

[0016] A negative pressure column, the negative pressure column comprising a base and a column, in an inverted "T" shape, the base being arranged above the lower sealing plate, the negative pressure column passing through the plurality of negative pressure blocks, the plurality of negative conductive sheets and the plurality of negative tabs, and being fastened by a fastening mechanism located on the uppermost negative tab to fix the positions of the plurality of negative conductive sheets and the plurality of negative tabs;

[0017] Wherein, the membrane capacitor deionization electrode assembly comprises a positive electrode, an anion exchange layer, a spacer mesh, a cation exchange layer and a negative electrode arranged in sequence, and the multiple membrane capacitor deionization electrode assemblies are divided into at least two groups, and the multiple membrane capacitor deionization electrode assemblies in each group of membrane capacitor deionization electrode assemblies are arranged in reverse order, so that the positive electrode collector of the positive electrode of the first membrane capacitor deionization electrode assembly contacts the positive electrode collector of the positive electrode of the second membrane capacitor deionization electrode assembly, or the negative electrode collector of the negative electrode of the first membrane capacitor deionization electrode assembly contacts the negative electrode collector of the negative electrode of the second membrane capacitor deionization electrode assembly;

[0018] Wherein, each group of membrane capacitor deionization electrode assemblies is placed above the lower sealing plate,

[0019] The positive electrode ear of the positive electrode in each group of membrane capacitor deionization electrode assemblies passes through the positive electrode pressure column through the positive electrode ear opening extending inward from the edge thereof, and the positive electrode ear contacts the positive electrode conductive sheet and is powered via the positive electrode conductive column connected to the positive electrode conductive sheet, and

[0020] Among them, the negative electrode tab of the negative electrode in each group of membrane capacitor deionization electrode assemblies passes through the negative electrode pressure column through the negative electrode tab opening extending inward from its edge, and the negative electrode tab contacts the negative electrode conductive sheet and is powered by the negative electrode conductive column connected to the negative electrode conductive sheet.

[0021] In one aspect, the electrode device further comprises at least one spacer plate, the at least one spacer plate being located inside the device housing for spacing at least two groups of membrane capacitor deionization electrode assemblies, the spacer plate comprising a spacer plate water outlet hole;

[0022] A positive electrode pressurizing column and a negative electrode pressurizing column disposed above the at least one spacer;

[0023] The positive electrode conductive column and the negative electrode conductive column also pass through the at least one spacer plate and extend out through the upper sealing plate respectively.

[0024] In one aspect, the electrode device further comprises an upper pressure plate and a lower pressure plate, wherein the upper pressure plate is located above the upper sealing plate, and the lower pressure plate is located below the lower sealing plate, and the upper pressure plate and the lower pressure plate are fixedly connected to the device housing.

[0025] In one aspect, the lower sealing plate includes a first groove and a second groove, wherein the first groove is used to receive the base of the positive pressure column to position the positive pressure column, and wherein the second groove is used to receive the base of the negative pressure column to position the negative pressure column.

[0026] In one aspect, the spacer plate includes a first groove and a second groove, wherein the first groove is used to receive the base of the positive electrode pressurization column to position the positive electrode pressurization column, and wherein the second groove is used to receive the base of the negative electrode pressurization column to position the negative electrode pressurization column.

[0027] On the one hand, a first notch and a second notch are respectively arranged near the first notch and the second notch of the partition plate, and the first notch and the second notch extend from the edge of the partition plate toward the first notch and the second notch to accommodate and fix the positive conductive column and the negative conductive column.

[0028] On the one hand, the upper edge and the lower edge of the device shell are respectively provided with groove platforms, and the groove platforms are stepped. The groove platform of the upper edge cooperates with the stepped edge of the upper sealing plate to form a sealing contact, and the groove platform of the lower edge cooperates with the stepped edge of the lower sealing plate to form a sealing contact, thereby achieving watertight performance.

[0029] On the one hand, the electrode device also includes a plurality of fixing columns, which are arranged on the inner side of the lower sealing plate and extend upward from the inner side of the lower sealing plate, through corresponding openings arranged on the spacer plate, to the inner side of the upper sealing plate, wherein the plurality of fixing columns are arranged to correspond to the outer edge of each group of membrane capacitor deionization electrode assemblies, so that each group of membrane capacitor deionization electrode assemblies are aligned.

[0030] In one aspect, the spacer plate further comprises at least one water through hole, which is arranged at a suitable position of the spacer plate and spaced a certain distance from each other to allow liquid or fluid to flow in and out.

[0031] On the one hand, the positive electrode pressure block is a columnar structure with multiple through holes inside to accommodate the positive electrode pressure column and the positive electrode conductive column respectively, and the negative electrode pressure block is a columnar structure with multiple through holes inside to accommodate the negative electrode pressure column and the negative electrode conductive column respectively.

[0032] In one aspect, the positive electrode pressure block and the negative electrode pressure block are hollow at the outer sides thereof.

[0033] On the one hand, the positive electrode also includes a positive active material layer coated on the positive current collector; the negative electrode also includes a negative active material layer coated on the negative current collector; the anion exchange layer is disposed on the surface of the positive active material layer; the cation exchange layer is disposed on the surface of the negative active material layer; the anion exchange layer allows anions to pass through and blocks cations from moving between the positive electrode and the spacer mesh; and the cation exchange layer allows cations to pass through and blocks anions from moving between the negative electrode and the spacer mesh.

[0034] In one aspect, the spacer mesh is made of a porous inert mesh material.

[0035] In one aspect, the membrane capacitor deionization electrode assembly further comprises a through hole, wherein the through hole is located at the center of the membrane capacitor deionization electrode assembly to allow fluid or liquid to flow through the membrane capacitor deionization electrode assembly via the through hole.

[0036] By utilizing the MCDI electrode assembly and shell structure as well as the module and method described in the present invention, the structural complexity of the module is reduced, the problem of low production efficiency is solved, low contact resistance and a sealed structure are ensured, and functions such as water desalination and wastewater recovery are effectively realized. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The following is an exemplary embodiment of the present invention with reference to the accompanying drawings.

[0038] Figure 1 A schematic diagram showing the internal structure of an electrode device including multiple groups of MCDI electrode assemblies according to an embodiment of the present invention.

[0039] Figure 2 A schematic diagram of a lower sealing plate of an electrode device according to an embodiment of the present invention is shown.

[0040] Figure 3 A schematic diagram of an upper sealing plate of an electrode device according to an embodiment of the present invention is shown.

[0041] Figure 4 A schematic diagram showing a spacer plate of an electrode device according to an embodiment of the present invention is shown.

[0042] Figure 5 A partially enlarged view of the internal structure of an electrode device including a plurality of groups of MCDI electrode assemblies according to an embodiment of the present invention is shown.

[0043] Figure 6 A schematic diagram of an electrode assembly for deionization according to an embodiment of the present invention is shown, wherein the electrode assembly is a membrane capacitive deionization (MCDI) electrode assembly.

[0044] Figure 7 Two examples according to an embodiment of the present invention are shown. Figure 6 An enlarged side view schematic diagram of an electrode stack composed of the MCDI electrode assembly.

[0045] Description of Reference Numerals

[0046] 1-positive electrode current collector, 2-positive electrode active material layer, 3-positive electrode tab, 4-anion exchange layer, 5-spacer mesh, 6-cation exchange layer, 7-negative electrode active material layer, 8-negative electrode current collector, 9-negative electrode tab, 10-electrode stack;

[0047] 11-positive electrode conductive sheet, 12-negative electrode conductive sheet, 13-positive electrode conductive column, 14-negative electrode conductive column, 15-positive electrode pressure column, 16-positive electrode pressure block, 17-negative electrode pressure column, 18-negative electrode pressure block, 19-lower sealing plate, 20-upper sealing plate;

[0048] 21-fixed column, 22-rectangular groove, 23-water inlet hole, 24-water outlet hole, 25-air vent, 26-drain hole, 27-spacer, 28-groove, 29-notch, 30-opening;

[0049] 31 - water outlet hole of partition plate, 32 - water hole, 33 - upper pressure bearing plate, 34 - lower pressure bearing plate, 35 - device shell. DETAILED DESCRIPTION

[0050] The detailed description described below is intended to describe various configurations of the subject technology, rather than being intended to represent only configurations that the subject technology can adopt. The accompanying drawings are incorporated herein and constitute a part of the detailed description. The detailed description includes specific details in order to provide a thorough understanding of the subject technology. However, it is apparent to those skilled in the art that the subject technology is not limited to the specific details described herein, and one or more embodiments can be used to implement. In one or more instances, the structure and components are shown in block diagram form to avoid confusing the concept of the subject technology. One or more embodiments of the present disclosure are illustrated by one or more diagrams and / or described in conjunction with one or more diagrams.

[0051] One embodiment of the present invention provides an electrode device for multiple membrane capacitor deionization electrode assemblies, the electrode device includes a housing structure, the housing structure includes a device housing 35, an upper sealing plate, a lower sealing plate and a spacer plate, such as Figure 1 The housing structure is made of a suitable non-conductive or insulating material. Figure 1 The device housing 35 is located at the periphery of the outer shell structure. The device housing 35 is in the form of a cylindrical outer shell, which has watertight properties. The material used to manufacture the device housing 35 can be a plastic with a certain mechanical strength, such as polypropylene, polyvinyl chloride, polymethyl methacrylate, acrylonitrile-butadiene-styrene plastic, and polyoxymethylene resin. The upper and lower edges of the device housing 35 are provided with groove platforms, which cooperate with the upper sealing plate 20 and the lower sealing plate 19 respectively to achieve the purpose of water sealing. The material of the upper sealing plate 20 covering the upper opening of the device housing 35 and the lower sealing plate 19 covering the lower opening of the device housing 35 is an insulating material, which can be a plastic with a certain mechanical strength, such as polypropylene, polyvinyl chloride, polymethyl methacrylate, acrylonitrile-butadiene-styrene plastic, and polyoxymethylene resin.

[0052] Alternatively, if Figure 2As shown, a plurality of fixing posts 21 are provided on the lower sealing plate 19, and the fixing posts 21 extend upward and pass through the spacer to fix and align the position of the electrode assembly stacked in the device housing 35, for example, four, six, eight, ten, etc. fixing posts 21 are used to fix and align. A groove, such as a rectangular groove 22, is provided on the lower sealing plate 19 to fix the position of the pressurizing column. For example, there are two rectangular grooves 22, the first of which is used to receive the base of the positive pressurizing column to position the positive pressurizing column and help determine the position of the positive conductive column next to the positive pressurizing column, and the second rectangular groove is used to receive the base of the negative pressurizing column to position the negative pressurizing column and help determine the position of the negative conductive column next to the negative pressurizing column. An opening is also provided on the lower sealing plate 19, which is a water inlet 23, so that the liquid to be treated, such as water, enters the conductive shell structure. Of course, multiple openings can be provided according to demand.

[0053] Optionally, in Figure 3 The upper sealing plate 20 shown is provided with two through holes, which are respectively located on both sides of the upper sealing plate and correspond to the positions of the positive conductive column 13 and the negative conductive column 14, so that the positive conductive column 13 and the negative conductive column 14 can extend out of the electrode device through the through holes and connect to an external power source. The upper sealing plate 20 also includes a water outlet 24, and liquid to be treated, such as water, can enter the electrode device through the water inlet 23, surrounding a plurality of Figure 7 The electrode stack 10 shown flows and flows into the electrode stack 10 through the spacing net 5. There is an opening in the middle of the electrode stack 10 composed of two MCDI electrode assemblies. The water flowing through the electrode stack 10 flows through the opening in the middle of the electrode stack 10 and flows out through the water outlet 24 of the upper sealing plate 20. The water outlet 24 can be located in the middle position of the upper sealing plate 20, or it can be located at other suitable positions. The upper sealing plate 20 includes at least one exhaust hole 25 for exhausting gas in the electrode device. The exhaust hole 25 is located near the edge of the upper sealing plate 20 and is not connected to or in contact with the water outlet hole, through hole or drain hole. The upper sealing plate 20 also includes a drain hole 26, which can be in a closed state when not used for drainage, and open the drain hole at the end of use to drain the water in the electrode device. For example, a suitable valve can be used to control the opening and closing of the drain hole. The edges of the upper sealing plate 20 and the lower sealing plate 19 are respectively provided with stepped portions to cooperate with the groove platform of the device shell 35, and a sealing gasket (not shown), such as a non-conductive gasket, such as a silicone gasket, is placed on the groove platform to achieve sealing of the conductive shell structure.

[0054] The conductive housing structure also includes a spacer 27. Figure 4The partition plate 27 shown is used to separate multiple spaces in the device housing, to separate multiple groups of electrode assemblies / electrode stacks, each group of electrode assemblies includes multiple MCDI electrode assemblies, and to provide pressurized support for the pressurized columns and pressurized blocks of each group of electrode stacks 10. The material of the partition plate 27 is a plastic with a certain mechanical strength, such as polypropylene, polyvinyl chloride, polymethyl methacrylate, acrylonitrile-butadiene-styrene plastic, polyoxymethylene resin, etc. The partition plate 27 includes two grooves 28, namely a first groove and a second groove, for example, rectangular, for fixing the position of the conductive column and the pressurized column, wherein the first groove is used to receive the base of the positive electrode pressurized column to position the positive electrode pressurized column, wherein the second groove is used to receive the base of the negative electrode pressurized column to position the negative electrode pressurized column. Two notches 29, namely a first notch and a second notch, are provided next to the two rectangular grooves, respectively extending from the edge of the partition plate toward the rectangular groove 28, for accommodating and fixing the positive electrode conductive column and the negative electrode conductive column, respectively. In addition, the spacer 27 optionally includes a plurality of openings 30 arranged at intervals, and the positions of the plurality of openings 30 correspond to the positions of the fixing columns 21, respectively, allowing the fixing columns 21 on the lower sealing plate 19 to pass through, and the openings are, for example, four, six, eight, or ten openings. In the present embodiment, the number of openings is eight, and the eight openings allow eight fixing columns 21 on the lower sealing plate 19 to pass through. The spacer 27 also includes a spacer water outlet 31 in the middle, and the spacer water outlet 31 is located in the middle of the spacer for discharging a liquid to be treated, such as water. In addition, in order to speed up the flow of the liquid, at least one water hole 32 can also be provided on the spacer 27. The water holes can be arranged at a suitable position of the spacer and spaced a certain distance from each other, such as arranged near the edge of the spacer, and can be two, three, four, five, six, seven, eight, etc. As shown in the figure, six water holes 32 allow water to flow into and out of the group of electrode assemblies.

[0055] The conductive housing structure may further include an upper pressure plate 33 and a lower pressure plate 34 to help withstand the water pressure in the device housing 35, wherein the upper pressure plate 33 is located above the upper sealing plate 20, and the lower pressure plate 34 is located below the lower sealing plate 19. The upper pressure plate 33 and the lower pressure plate 34 are generally made of corrosion-resistant metal materials, such as stainless steel. During assembly, the upper pressure plate 33 and the lower pressure plate 34 are pressurized and fixed by the cooperation of multiple bolts and nuts, for example, by four metal bolts and nuts. The metal bolts connect the upper pressure plate 33 and the lower pressure plate 34 to the device housing 35, respectively, thereby fixing the positions of the upper sealing plate 20 and the lower sealing plate 19 inside the device housing 35. Of course, other connection methods may also be used to connect the upper pressure plate 33 and the lower pressure plate 34 to the device housing 35, such as by bolt sealing, by snap-fit ​​device sealing, by hinge device sealing, etc.

[0056] The device housing 35 is used to accommodate a plurality of membrane capacitive deionization (MCDI) electrode assemblies. Figure 6 The MCDI electrode assembly includes a positive electrode, a negative electrode, an anion exchange layer 4, a cation exchange layer 6 and a spacer 5. Specifically, the MCDI electrode assembly is provided with a negative electrode current collector 8, a negative electrode active material layer 7, a cation exchange layer 6, a spacer 5, an anion exchange layer 4, a positive electrode active material layer 2, and a positive electrode current collector 1 in order from top to bottom, and can also be arranged in the opposite way.

[0057] The positive electrode includes a positive current collector 1 and a positive active material layer 2, and the negative electrode includes a negative current collector 8 and a negative active material layer 7. The positive current collector 1 and the negative current collector 8 are generally materials with good conductivity and high electrochemical stability, such as graphite paper or titanium foil. Preferably, the positive current collector 1 and the negative current collector 8 are generally the same material. The positive active material layer 2 and the negative active material layer 7 are coated on the positive current collector 1 and the negative current collector 8, respectively. The positive active material layer 2 and the negative active material layer 7 are mainly composed of active materials, conductive agents and binders. The active materials are generally materials with high effective specific surface area, such as activated carbon; the conductive agent is a carbon material with good conductivity, such as conductive carbon black; the binder is a high molecular organic matter, such as polyvinylidene fluoride or polyvinyl alcohol. The above active material layers are attached to the positive current collector and the negative current collector under the action of the binder, covering part or all of the area of ​​the positive current collector and the negative current collector. The positive electrode active material layer 2 and the negative electrode active material layer 7 may be made of the same material or different materials. The coated positive electrode active material layer 2 and the negative electrode active material layer 7 may be in a square, rectangle, parallelogram or the like.

[0058] The positive electrode current collector 1 also includes a positive electrode tab 3 extending outward from one side thereof, and the positive electrode tab 3 is not covered by the positive electrode active material. The negative electrode current collector 8 also includes a negative electrode tab 9 extending outward from one side thereof, and the negative electrode tab 9 is not covered by the negative electrode active material. The positive electrode tab 3 and the negative electrode tab 9 are used to connect the positive electrode conductive structure and the negative electrode conductive structure, respectively, and are respectively located on both sides of the MCDI electrode assembly when set. Optionally, the positive electrode tab 3 has a positive electrode tab opening extending inward from the edge of the positive electrode tab, and the positive electrode tab opening can be one, or at least two spaced positive electrode tab openings, such as two, three, or four; the negative electrode tab 9 has a negative electrode tab opening extending inward from the edge of the negative electrode tab 9, and the negative electrode tab opening can be one, or at least two spaced negative electrode tab openings, such as two, three, or four. The opening of the positive electrode extends inward from the outside of the positive electrode tab 3 for a distance and terminates at a portion of the positive electrode active material that has not yet reached the positive electrode collector 1. Similarly, the opening of the negative electrode extends inward from the outside of the negative electrode tab 9 for a distance and terminates at a portion of the negative electrode active material that has not yet reached the negative electrode collector 8. The elongated connecting portion can be two, three or more pieces. In this embodiment, three elongated connecting portions are preferably shown. The positive electrode tab opening and the negative electrode tab opening of the positive electrode tab 3 and the negative electrode tab 9 can allow the positive electrode pressure column and the negative electrode pressure column to pass through respectively when in use, thereby allowing multiple positive electrode tabs 3 and multiple negative electrode tabs 9 to contact the positive electrode conductive sheet and the negative electrode conductive sheet as flatly as possible, with a larger contact area, and it is helpful to fix multiple positive electrode tabs 3 and multiple negative electrode tabs 9 tightly above or below the positive electrode conductive sheet and the negative electrode conductive sheet through the pressure block.

[0059] The anion exchange layer 4 is located on the surface of the positive electrode active material layer 2, and is used to allow anions to pass through the anion exchange layer 4 and block cations from moving between the positive electrode and the spacer 5. The anion exchange layer 4 can be an anion exchange polymer organic coating, placed or attached to the positive electrode active material layer 2, or an independently supported anion exchange membrane. The anion exchange layer 4 can be made of commercially available suitable materials. The cation exchange layer 6 is located on the surface of the negative electrode active material layer 7, and is used to allow cations to pass through the cation exchange layer 6 and block anions from moving between the negative electrode and the spacer 5. The cation exchange layer 6 can be a cation exchange polymer organic coating, placed or attached to the negative electrode active material layer 7, or an independently supported cation exchange membrane. The cation exchange layer 6 can be made of commercially available suitable materials.

[0060] The spacer net 5 is a mesh structure made of a porous inert material, and is used to space the positive electrode, the anion exchange layer 4 and the negative electrode, the cation exchange layer 6. The spacer net 5 material is usually an electrical insulating material, such as nylon or nylon. The spacer net 5 provides a flow path for the liquid to be treated, such as water, between the cation exchange layer 6 and the anion exchange layer 4.

[0061] The MCDI electrode assembly of this embodiment further includes a through hole, which allows a fluid or liquid, such as water, to flow through the MCDI electrode assembly. Figure 6 As shown, the through hole can be located at the center of the electrode, for example, a rectangle, or any suitable shape. The through hole exists in the positive electrode, the negative electrode, the anion exchange layer 4, the cation exchange layer 6 and the spacer mesh 5, and the position of the through hole of each layer is corresponding, for example, it can be located at the center of the MCDI electrode assembly.

[0062] The device housing 35 also includes at least one positive conductive sheet 11 and at least one negative conductive sheet 12, a positive conductive column 13 and a negative conductive column 14, at least one pressurizing column and at least one pressurizing block. The positive conductive sheet 11 and the negative conductive sheet 12 are respectively located on opposite sides of each layer of the electrode assembly, so that the positive pole tabs and the negative pole tabs of each layer of the electrode assembly are in contact with the positive conductive sheet 11 and the negative conductive sheet 12 respectively. A plurality of positive pole tabs contact the upper surface and the lower surface of the positive conductive sheet 11, and a plurality of negative pole tabs contact the upper surface and the lower surface of the negative conductive sheet 12. The material of the positive conductive sheet and the negative conductive sheet is generally a flexible material with good conductivity and corrosion resistance, such as titanium metal foil. Through the direct contact between the positive conductive sheet 11 and the negative conductive sheet 12 and the plurality of positive pole tabs 3 or the plurality of negative pole tabs 9, the current can be conducted to the positive electrode or the negative electrode located outside the device housing 35. In addition, the positive electrode conductive sheet 11 and the negative electrode conductive sheet 12 may also include an opening so that the fixing column passes through the opening to accommodate the fixing column. Usually, multiple pairs (for example, 20-30 pairs) of membrane capacitor deionization electrodes form a layer of electrode assembly, and multiple positive electrode tabs of each layer of electrode assembly contact a positive electrode conductive sheet 11 for conduction, and multiple negative electrode tabs of each layer of electrode assembly contact a negative electrode conductive sheet 12 for conduction. In one embodiment, after the MCDI electrode assembly is energized by conduction of the positive electrode conductive sheet and the negative electrode conductive sheet, a liquid or fluid, such as water, enters the electrode stack composed of multiple groups of MCDI electrode assemblies. For each MCDI electrode assembly, the fluid passes through the spacer mesh 5 between the anion exchange layer 4 and the cation exchange layer 6, and then flows out through the through hole, wherein the anions and cations in the fluid are adsorbed to the positive active layer and the negative active layer.

[0063] In the present embodiment, a group of electrode assemblies includes a multi-layer electrode stack 10, for example, a 4-5-layer electrode stack. Each electrode stack 10 includes two electrode assemblies. When multiple electrode assemblies are arranged, the first pair of electrodes are placed below, and the second pair of electrodes are placed above the first pair of electrodes, and the multiple electrode assemblies are arranged in reverse order. If the arrangement is such that the positive current collector 1 of the first pair of electrodes in the electrode stack contacts the second pair of electrodes, then the positive current collector 1 of the second pair of electrodes contacts the positive current collector 1 of the first pair of electrodes; or, if the arrangement is such that the negative current collector 8 of the first pair of electrodes in the electrode stack contacts the second pair of electrodes, then the negative current collector 8 of the second pair of electrodes contacts the negative current collector 8 of the first pair of electrodes, and so on. The above arrangement ensures that the positive electrode and the negative electrode are insulated from each other, and multiple pairs of electrodes, for example 20-30 pairs of electrodes, are repeatedly stacked in this manner to form a layer of electrode assembly. Figure 7 As shown, the negative electrode collector 8 of the second pair of electrodes is in contact with the negative electrode collector 8 of the first pair of electrodes, and the positive electrode collector 1 is on the upper side of the first pair of electrodes, which can be in contact with the positive electrode collector 1 of another pair of electrodes above it, and the positive electrode collector 1 is on the lower side of the second pair of electrodes, which can be in contact with the positive electrode collector 1 of another pair of electrodes below it.

[0064] The positive conductive column 13 and the negative conductive column 14 extend upward from the bottom of the device housing 35, pass through and connect multiple positive conductive sheets 11 and multiple negative conductive sheets 12, extend out of the electrode device from the two through holes of the upper sealing plate 20, and are respectively connected to the positive and negative electrodes of the power supply located outside. Through such a connection, each pair of electrodes is connected to the power supply through the positive conductive sheet and the negative conductive sheet and the positive conductive column and the negative conductive column, and the current is conducted from the power supply to each positive conductive sheet and the negative conductive sheet, and then flows into the electrode. The diameter of the positive conductive column and the negative conductive column is, for example, 6-10 mm to provide sufficient conductive area. The material of the positive conductive column and the negative conductive column is a metal material with good electrical conductivity, such as copper, titanium or copper-titanium composite metal material. The conductive sheet and the conductive column are similar materials and are tightly or integrally connected to each other. The conductive sheet may be in the form of a flexible foil, for example, and the thickness of the conductive sheet is less than 0.8 μm, for example, 0.1-0.7 μm, for example, 0.2-0.6 μm, for example, 0.3-0.5 μm, for example, 0.4 μm, etc. In order to ensure good conductivity between the conductive sheet and the conductive column, the positive conductive sheet 11 is, for example, welded to the positive conductive column 13, and the negative conductive sheet 12 is, for example, welded to the negative conductive column 14.

[0065] like Figure 5In detail, the pressurized column includes a positive pressurized column 15 and a negative pressurized column 17, and the pressurized block includes a positive pressurized block 16 and a negative pressurized block 18. The pressurized column and the pressurized block are made of corrosion-resistant inert materials with certain mechanical strength, such as plastic, stainless steel or titanium. The top of the pressurized column is pressed tightly between the base of the pressurized column and the nut by a nut.

[0066] By arranging a pressurizing column and a pressurizing block in the device housing 35, the connection between the electrode ear and the conductive sheet in the device housing is stabilized. Figure 1 As shown, the positive pole tabs and negative pole tabs of the multiple electrodes of the upper layer of the electrode assembly contact the positive electrode conductive sheet and the negative electrode conductive sheet of the upper layer, and there is a gap between the positive pole tabs and the negative pole tabs used by the next layer of the electrode assembly to contact the positive electrode conductive sheet and the negative electrode conductive sheet. The gap can be filled by a pressure block to provide support during pressure. The pressure column includes a base and a column, which is in an inverted "T" shape and is arranged above the partition plate. The base of the pressure column is arranged on the partition plate, and the column extends upward from the base, passes through multiple pressure blocks, multiple conductive sheets and multiple tabs, and terminates at the topmost conductive sheet / tab of the group of electrode assemblies, and is connected by means such as bolt connection, snap connection, etc. For example, the positive pressure column 15 passes through multiple positive pressure blocks 16, multiple positive conductive sheets 11 and multiple positive tabs 3, and the negative pressure column 17 passes through multiple negative pressure blocks 18, multiple negative conductive sheets 12 and multiple negative tabs 9. Optionally, for each group of electrode assemblies, two positive electrode pressure columns 15 are set, which respectively pass through the two openings of the positive electrode tab 3 and are fixed on a base, forming a group of positive electrode pressure columns; two negative electrode pressure columns 17 are set, which respectively pass through the two openings of the negative electrode tab 9 and are fixed on a base, forming a group of negative electrode pressure columns.

[0067] The pressure block may be a columnar structure having a plurality of through holes therein to accommodate pressure columns, conductive columns, etc. The pressure block may be hollow at the bottom on its outer side to reduce its weight. When in use, the positive electrode pressure block presses the positive electrode tab tightly above and / or below the positive electrode conductive sheet, and when in use, the negative electrode pressure block presses the negative electrode tab tightly above and / or below the negative electrode conductive sheet.

[0068] Therefore, when pressurizing, the positive electrode tabs and negative electrode tabs in a group of electrode assemblies are respectively pressed against the positive conductive sheet 11 and the negative conductive sheet 12 by a group of positive pressurizing columns 15 and positive pressurizing blocks 16 and a group of negative pressurizing columns 17 and negative pressurizing blocks 18. The pressurizing columns pass through the conductive sheets, and through nuts for fixing the pressurizing columns, for example, located on the topmost electrode sheet / tabs, force is applied in a direction perpendicular to the electrode surface with the assistance of the pressurizing columns and pressurizing blocks to ensure that the tabs and conductive sheets of each layer of electrode assemblies are in close contact, so as to reduce the contact resistance between the tabs and the conductive sheets, and to ensure good conductivity between each pair of electrode tabs and conductive sheets.

[0069] In the process of manufacturing and assembling the electrode device according to the present embodiment, the first pair of electrodes is placed on the lower sealing plate 19 and in the device housing, and the position is fixed by eight fixing columns 21; the second pair of electrodes is placed on the first pair of electrodes, and the positive electrode current collector 1 of the first pair of electrodes is in contact with the positive electrode current collector 1 of the second pair of electrodes, or the negative electrode current collector 8 of the first pair of electrodes is in contact with the negative electrode current collector 8 of the second pair of electrodes, so as to ensure that the positive electrode and the negative electrode are insulated from each other, and multiple pairs of electrodes (for example, 20-30 pairs) are repeatedly stacked in this way to form a layer of electrode assembly, and then multiple layers of electrode assemblies, for example, 4-5 layers, 6-7 layers, 8-10 layers of electrode assemblies are stacked to form a group of electrode assemblies. Each group of electrode assemblies is separated by a spacer 27, and at least one spacer 27 can be inserted into the electrode device along the eight fixing columns 21, and the position of the electrode assembly is limited by the fixing columns, and the base of each fixing column is located in the rectangular groove 28 of the spacer to limit the position of the fixing column. According to the processing capacity to be achieved, the number of electrode assemblies in the electrode device can be different, and the length of the conductive column and the height of the device housing 35 can be changed according to the specific number of electrode assemblies to cooperate in manufacturing electrode devices of different sizes. Optionally, the electrode device of this embodiment can accommodate up to 450 pairs of electrodes.

[0070] By using the device and method of the present invention, the membrane capacitor deionization electrode device can accommodate and connect multiple pairs of membrane capacitor deionization electrodes to increase the salt adsorption and water treatment capacity. At the same time, the use of the pole ear of the present invention can avoid breakage, enhance the seal between the shell and the upper sealing plate and the lower sealing plate, facilitate the compression of the pole ear of each layer of electrode, increase the space utilization rate of the device, and reduce the difficulty of manufacturing and processing. Therefore, the present invention can effectively realize the application of groundwater desalination, wastewater recovery, such as the recovery of sewage from power stations, washing wastewater or other industrial wastewater.

[0071] The word "comprising" used in this specification means "at least partially comprising". When interpreting each statement in this specification containing the word "including", there may also be features other than or beginning with this word. Related terms such as "comprising" and "including" should be interpreted in the same way.

[0072] For those skilled in the art to which the present invention belongs, many changes in structure of the present invention and widely different embodiments and applications of the present invention will be apparent without departing from the scope of the present invention as defined by the appended claims. The disclosure and description herein are purely illustrative and are not intended to be limiting in any sense. When specific integers having known equivalents in the field related to the present invention are mentioned herein, these known equivalents are deemed to be incorporated herein as if set forth separately.

[0073] As used herein, the term "and / or" means "and" or "or" or both.

[0074] In the description of this specification, reference may be made to subject matter that is not within the scope of the appended claims. Such subject matter should be easily recognized by those skilled in the art and can assist in putting the invention as defined in the appended claims into practice.

[0075] Although the present invention is generally defined above, it will be appreciated by those skilled in the art that the present invention is not limited thereto and that the present invention also includes embodiments for which the following embodiments give examples.

[0076] The foregoing description of the invention includes preferred forms thereof. Modifications may be made thereto without departing from the scope of the invention.

Claims

1. An electrode device for multiple membrane capacitor deionization electrode assemblies, characterized in that: The electrode device comprises: A device housing, the device housing is located outside the electrode device and is in the form of a cylindrical shell, and the device housing has watertight performance; An upper sealing plate, the upper sealing plate is located above the device housing and covers the upper opening of the device housing, the upper sealing plate includes a water outlet hole; A lower sealing plate, the lower sealing plate is located below the device housing and covers a lower opening of the device housing, the lower sealing plate includes a water inlet hole; A positive conductive column, the positive conductive column extending upward from the bottom of the device housing, passing through the membrane capacitor deionization electrode assembly, and extending through the upper sealing plate; A negative electrode conductive column, the negative electrode conductive column extending upward from the bottom of the device housing, passing through the membrane capacitor deionization electrode assembly, and extending through the upper sealing plate; A plurality of positive electrode conductive sheets, each of which is fixedly connected to the positive electrode conductive column and directly or indirectly contacts the positive electrode tab extending outward from one side of the positive electrode of the membrane capacitor deionization electrode assembly to conduct electricity; A plurality of negative electrode conductive sheets, each of which is fixedly connected to the negative electrode conductive column and directly or indirectly contacts the negative electrode tab extending outward from one side of the negative electrode of the membrane capacitor deionization electrode assembly to conduct electricity; A plurality of positive electrode pressure blocks, wherein the positive electrode pressure blocks are located between the plurality of positive electrode conductive sheets to help maintain the positions of the plurality of positive electrode conductive sheets and the plurality of positive electrode tabs above and below the positive electrode pressure blocks; A plurality of negative electrode pressure blocks, wherein the negative electrode pressure blocks are located between the plurality of negative electrode conductive sheets to help maintain the positions of the plurality of negative electrode conductive sheets and the plurality of negative electrode tabs above and below the negative electrode pressure blocks; A positive pressure column, the positive pressure column comprising a base and a column, in an inverted "T" shape, the base being arranged above the lower sealing plate, the positive pressure column passing through the plurality of positive pressure blocks, the plurality of positive conductive sheets and the plurality of positive tabs, and being fastened by a fastening mechanism located on the uppermost positive tab to fix the positions of the plurality of positive conductive sheets and the plurality of positive tabs; A negative pressure column, the negative pressure column comprising a base and a column, in an inverted "T" shape, the base being arranged above the lower sealing plate, the negative pressure column passing through the plurality of negative pressure blocks, the plurality of negative conductive sheets and the plurality of negative tabs, and being fastened by a fastening mechanism located on the uppermost negative tab to fix the positions of the plurality of negative conductive sheets and the plurality of negative tabs; Wherein, the membrane capacitor deionization electrode assembly comprises a positive electrode, an anion exchange layer, a spacer mesh, a cation exchange layer and a negative electrode arranged in sequence, and the multiple membrane capacitor deionization electrode assemblies are divided into at least two groups, and the multiple membrane capacitor deionization electrode assemblies in each group of membrane capacitor deionization electrode assemblies are arranged in reverse order, so that the positive electrode collector of the positive electrode of the first membrane capacitor deionization electrode assembly contacts the positive electrode collector of the positive electrode of the second membrane capacitor deionization electrode assembly, or the negative electrode collector of the negative electrode of the first membrane capacitor deionization electrode assembly contacts the negative electrode collector of the negative electrode of the second membrane capacitor deionization electrode assembly; Wherein, each group of membrane capacitor deionization electrode assemblies is placed above the lower sealing plate, The positive electrode tab of the positive electrode in each group of membrane capacitor deionization electrode assemblies passes through the positive electrode pressure column through the positive electrode tab opening extending inward from the edge thereof, and the positive electrode tab contacts the positive electrode conductive sheet and is powered by the positive electrode conductive column connected to the positive electrode conductive sheet, and Among them, the negative electrode tab of the negative electrode in each group of membrane capacitor deionization electrode assemblies passes through the negative electrode pressure column through the negative electrode tab opening extending inward from its edge, and the negative electrode tab contacts the negative electrode conductive sheet and is powered by the negative electrode conductive column connected to the negative electrode conductive sheet.

2. The electrode device according to claim 1, characterized in that Also includes, At least one spacer plate, the at least one spacer plate is located inside the device housing to separate at least two groups of membrane capacitor deionization electrode assemblies, and the spacer plate includes a spacer plate water outlet hole; A positive electrode pressurizing column and a negative electrode pressurizing column disposed above the at least one spacer; The positive electrode conductive column and the negative electrode conductive column also pass through the at least one spacer plate and extend out through the upper sealing plate respectively.

3. The electrode device according to claim 1, characterized in that It also includes an upper pressure plate and a lower pressure plate, wherein the upper pressure plate is located above the upper sealing plate, and the lower pressure plate is located below the lower sealing plate, and the upper pressure plate and the lower pressure plate are fixedly connected to the device housing.

4. The electrode device according to any one of claims 1 to 3, characterized in that: The lower sealing plate includes a first groove and a second groove, wherein the first groove is used to receive the base of the positive electrode pressurizing column to position the positive electrode pressurizing column, wherein the second groove is used to receive the base of the negative electrode pressurizing column to position the negative electrode pressurizing column.

5. The electrode device according to claim 3, characterized in that: The spacer includes a first groove and a second groove, wherein the first groove is used to receive the base of the positive electrode pressurizing column to position the positive electrode pressurizing column, and the second groove is used to receive the base of the negative electrode pressurizing column to position the negative electrode pressurizing column.

6. The electrode device according to claim 5, characterized in that A first notch and a second notch are respectively arranged near the first notch and the second notch of the partition plate, and the first notch and the second notch extend from the edge of the partition plate toward the first notch and the second notch to respectively accommodate and fix the positive conductive column and the negative conductive column.

7. The electrode device according to any one of claims 1 to 3, characterized in that: The upper edge and the lower edge of the device shell are respectively provided with groove platforms, and the groove platforms are stepped. The groove platform of the upper edge cooperates with the stepped edge of the upper sealing plate to form a sealing contact, and the groove platform of the lower edge cooperates with the stepped edge of the lower sealing plate to form a sealing contact, thereby achieving watertight performance.

8. The electrode device according to claim 3, characterized in that: It also includes a plurality of fixing columns, which are arranged on the inner side of the lower sealing plate and extend upward from the inner side of the lower sealing plate, through corresponding openings arranged on the spacer plate, to the inner side of the upper sealing plate, wherein the plurality of fixing columns are arranged to correspond to the outer edge of each group of membrane capacitor deionization electrode assemblies, so that each group of membrane capacitor deionization electrode assemblies are aligned.

9. The electrode device according to claim 3, characterized in that: The partition plate further comprises at least one water through hole, which is arranged at a suitable position of the partition plate and spaced a certain distance from each other to allow liquid or fluid to flow in and out.

10. The electrode device according to any one of claims 1 to 3, characterized in that: The positive electrode pressure block is a columnar structure with multiple through holes inside to accommodate the positive electrode pressure column and the positive electrode conductive column respectively. The negative electrode pressure block is a columnar structure with multiple through holes inside to accommodate the negative electrode pressure column and the negative electrode conductive column respectively.

11. The electrode device according to any one of claims 1 to 3, characterized in that: The positive electrode pressure block and the negative electrode pressure block are hollow at the bottom on their outer sides.

12. The electrode device according to any one of claims 1 to 3, characterized in that: The positive electrode further includes a positive active material layer coated on the positive current collector; The negative electrode further includes a negative active material layer coated to the negative current collector; The anion exchange layer is disposed on the surface of the positive electrode active material layer; The cation exchange layer is disposed on the surface of the negative electrode active material layer; The anion exchange layer allows anions to pass through and blocks cations from moving between the positive electrode and the spacer mesh; and The cation exchange layer allows cations to pass through and blocks anions from moving between the cathode electrode and the spacer mesh.

13. The electrode device according to any one of claims 1 to 3, characterized in that: The spacer mesh is made of a porous inert mesh material.

14. The electrode device according to any one of claims 1 to 3, characterized in that: The membrane capacitor deionization electrode assembly further comprises a through hole, wherein the through hole is located at the center of the membrane capacitor deionization electrode assembly to allow fluid or liquid to flow through the membrane capacitor deionization electrode assembly via the through hole.

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