Capacitive deionization filter element and water purification equipment

Abstract

The utility model relates to the technical field of water purification, in particular to a capacitive deionization filter element and water purification equipment. The capacitive deionization filter element comprises an electrode assembly, the electrode assembly comprises an insulating sheet and at least two layers of electrode plates, the insulating sheet and the electrode plates are arranged in a laminated mode, and the insulating sheet is clamped between the two adjacent layers of electrode plates; the electrode plate comprises a current collector layer and adsorption layers, and the adsorption layers are arranged on the front and back surfaces of the current collector layer; two adjacent layers of electrode plates are respectively configured as a positive plate and a negative plate, and a water passing channel for accommodating the insulating sheet is formed between the positive plate and the negative plate. The capacitive deionization filter element disclosed by the utility model is relatively simple in structure, simplifies the lamination arrangement process of the electrode assemblies, is convenient to process and produce, reduces the processing cost, and can ensure the purification treatment effect on raw water to a certain extent.

Description

Technical Field

[0001] The utility model relates to the technical field of water purification, in particular to a capacitive deionization filter element and a water purification device. Background Art

[0002] Capacitive Deionization (CDI) is a water desalination and purification technology based on the double-layer capacitance theory. Its basic principle is that after applying a low voltage to the electrodes, cations, anions or charged particles in the solution migrate to the two electrodes respectively under the action of the electric field force and the concentration gradient, and adsorb on the electrode surface to form a double-layer capacitance, so as to achieve the purpose of desalination or purification. The capacitive deionization technology can achieve different water outlet qualities at different voltages, retain ions beneficial to the human body, and remove heavy metal ions.

[0003] In the related art, the existing capacitive deionization filter elements usually stack components such as electrode sheets, ion exchange membranes, and electrode inter-channel grids, and then wind them into a wound film structure. It is found in actual applications that such filter elements not only have a complex structure, high cost, and are not easy to process and produce, but also are difficult to ensure the water purification effect. Summary of the Utility Model

[0004] The utility model aims to solve at least one of the technical problems existing in the related art. For this purpose, the utility model provides a capacitive deionization filter element, which has a relatively simple structure, simplifies the lamination arrangement process of the electrode components, is convenient for processing and production, reduces the processing cost, and can also ensure the purification effect of raw water to a certain extent.

[0005] The utility model also provides a water purification device.

[0006] The capacitive deionization filter element according to the first aspect embodiment of the utility model includes:

[0007] An electrode assembly, including: an insulating sheet and at least two layers of electrode sheets, the insulating sheet and the electrode sheets are arranged in a laminated manner, and the insulating sheet is clamped between two adjacent layers of the electrode sheets;

[0008] The electrode sheet includes a current collector layer and an adsorption layer, and the adsorption layers are provided on both the front and back sides of the current collector layer; two adjacent layers of the electrode sheets are respectively configured as a positive electrode sheet and a negative electrode sheet, and a water passing channel for accommodating the insulating sheet is formed between the positive electrode sheet and the negative electrode sheet.

[0009] According to an embodiment of the utility model, it further includes:

[0010] A central column, having a water outlet channel and a water passing hole communicated with the water outlet channel, and the water passing hole is arranged on the peripheral wall of the central column;

[0011] The electrode assembly is wound around the circumferential wall of the central column, and both ends of the electrode assembly along the axial direction of the central column are sealed. The inner and outer ends of the electrode assembly relative to the central column are correspondingly formed as a water outlet end and a water inlet end;

[0012] Wherein, the water inlet end is communicated with the water outlet end through the water passing channel, and the water outlet end extends to the circumferential wall of the central column and forms a fluid communication with the water passing hole.

[0013] According to an embodiment of the present invention, adjacent two layers of the electrode sheets are arranged oppositely along the stacking direction, and the insulating sheet and the electrode sheet are arranged in a staggered manner along the stacking direction, so as to hide the electrode sheet between adjacent two layers of the insulating sheets.

[0014] According to an embodiment of the present invention, a plurality of groups of the water passing holes are arranged on the circumferential wall of the central column along the circumferential direction, and each group of the water passing holes is arranged along the axial direction of the central column;

[0015] The number of the electrode sheets is greater than two, so that a plurality of water passing channels are formed in the electrode assembly; the inner end of the electrode assembly forms a plurality of water outlet ends corresponding to the plurality of water passing channels, and the plurality of water outlet ends are arranged opposite to the plurality of groups of water passing holes.

[0016] According to an embodiment of the present invention, it further includes:

[0017] A central column, around which the electrode assembly is wound;

[0018] The electrode assembly has a water inlet end and a water outlet end, and the water inlet end and the water outlet end are oppositely arranged at both ends of the electrode assembly along the axial direction of the central column, and the water inlet end is communicated with the water outlet end through the water passing channel.

[0019] According to an embodiment of the present invention, the electrode assembly further includes:

[0020] A positive electrode tab, electrically connected to the current collector layer of the positive electrode sheet;

[0021] A negative electrode tab, electrically connected to the current collector layer of the negative electrode sheet.

[0022] According to an embodiment of the present invention, the current collector layer includes any one of copper foil, titanium foil and graphite paper, and the adsorption layer includes an activated carbon layer.

[0023] According to an embodiment of the present invention, the thickness of the current collector layer is 15-50 microns, and the thickness of the adsorption layer is 25-200 microns.

[0024] According to an embodiment of the present invention, the insulating sheet is of a porous structure.

[0025] According to an embodiment of the present utility model, the thickness of the insulating sheet is 0.1 - 1.0 millimeters.

[0026] According to an embodiment of the present utility model, it further includes:

[0027] A housing having a receiving cavity, a water inlet and a water outlet communicating with the receiving cavity;

[0028] The electrode assembly is disposed in the receiving cavity, and the electrode assembly is used for purifying the raw water input into the receiving cavity through the water inlet, and the purified water after purification is discharged from the water outlet.

[0029] The water purification device according to the second aspect embodiment of the present utility model includes: a machine body and the capacitive deionization filter element as described above; the machine body has an installation cavity, and the capacitive deionization filter element is detachably disposed in the installation cavity.

[0030] One or more of the above technical solutions in the embodiments of the present utility model have at least one of the following technical effects: By providing adsorption layers on the front and back sides of the current collector layer, an integrated design of the electrode sheet is achieved. Only by stacking the electrode sheets and insulating sheets in an alternating arrangement can an electrode assembly be formed; this stacked arrangement design of the electrode assembly simplifies the arrangement structure of the electrode assembly, facilitates processing and production, and is beneficial to reducing production costs.

[0031] At the same time, in practical applications, only by electrically connecting the adjacent two layers of electrode sheets to the positive and negative electrodes of the power supply can the ions in the raw water passing through the water passage be adsorbed to achieve the purpose of purifying the raw water; since the ions can be adsorbed on both sides of each electrode sheet, the purification effect of the raw water is ensured.

[0032] Some of the additional aspects and advantages of the present utility model will be given in the following description, some will become obvious from the following description, or will be understood through the practice of the present utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or related technologies, the following will briefly introduce the drawings required for use in the description of the embodiments or related technologies. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0034] Figure 1 It is a schematic cross-sectional structure diagram of the electrode assembly provided by the embodiment of the present utility model;

[0035] Figure 2It is a schematic cross-sectional structure diagram of an electrode sheet provided by an embodiment of the present invention;

[0036] Figure 3 It is one of the schematic structure diagrams provided by an embodiment of the present invention for winding an electrode assembly around the outside of a central column;

[0037] Figure 4 It is another schematic structure diagram provided by an embodiment of the present invention for winding an electrode assembly around the outside of a central column;

[0038] Figure 5 It is still another schematic structure diagram provided by an embodiment of the present invention for winding an electrode assembly around the outside of a central column;

[0039] Figure 6 It is a schematic structure diagram of a capacitive deionization filter element provided by an embodiment of the present invention;

[0040] Figure 7 It is one of the schematic cross-sectional views of a capacitive deionization filter element provided by an embodiment of the present invention;

[0041] Figure 8 It is another schematic cross-sectional view of a capacitive deionization filter element provided by an embodiment of the present invention;

[0042] Reference numerals:

[0043] 1. Electrode assembly; 11. Insulating sheet; 12. Electrode sheet; 121. Current collector layer; 122. Adsorption layer; 100. Water passage; 101. Positive electrode tab; 102. Negative electrode tab;

[0044] 2. Central column; 21. Water outlet channel; 22. Water through hole;

[0045] 3. Housing; 31. Accommodation cavity; 32. Water inlet; 33. Water outlet;

[0046] 4. Power connection assembly; 41. Positive terminal; 42. Negative terminal. Detailed implementation manners

[0047] The following further describes in detail the implementation manners of the present invention in conjunction with the drawings and embodiments. The following embodiments are used to illustrate the present invention, but cannot be used to limit the scope of the present invention.

[0048] In the description of the embodiments of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of the present utility model 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, it should not be construed as a limitation to the embodiments of the present utility model. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0049] In the description of the embodiments of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "connected" and "coupled" 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 directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present utility model can be understood according to specific situations.

[0050] In the embodiments of the present utility model, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature can be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature can be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0051] In the description of this specification, the description referring to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the embodiments of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0052] In the first aspect, as Figure 1 and Figure 2As shown in the figure, an embodiment of the present utility model provides a capacitive deionization filter element, which includes: an electrode assembly 1; the electrode assembly 1 includes: an insulating sheet 11 and at least two layers of electrode sheets 12, the insulating sheet 11 and the electrode sheets 12 are arranged in a stacked manner, and the insulating sheet 11 is sandwiched between two adjacent layers of electrode sheets 12;

[0053] The electrode sheet 12 includes a current collector layer 121 and an adsorption layer 122, and the adsorption layers 122 are provided on both the front and back sides of the current collector layer 121; two adjacent electrode sheets 12 are respectively configured as a positive electrode sheet and a negative electrode sheet, and a water passage 100 for accommodating the insulating sheet 11 is formed between the positive electrode sheet and the negative electrode sheet.

[0054] It can be understood that according to actual application requirements, when the electrode assembly 1 is not wound, the electrode assembly 1 can stack the insulating sheet 11 and the electrode sheets 12 in the stacking direction as shown in Figure 1 the figure, so that the capacitive deionization filter element is configured as a square filter element. When it is selected to wind the electrode assembly 1, after the electrode assembly 1 stacks the insulating sheet 11 and the electrode sheets 12 in the stacking direction as shown in Figure 1 the figure, it is then wound until the electrode assembly 1 forms a column shape, so that the capacitive deionization filter element is configured as a columnar filter element.

[0055] The insulating sheet 11 and the electrode sheets 12 are stacked in an alternating arrangement to achieve that the insulating sheet 11 is sandwiched between two adjacent layers of electrode sheets 12. Since two adjacent electrode sheets 12 are respectively configured as a positive electrode sheet and a negative electrode sheet, when the number of electrode sheets 12 is greater than two layers, in order to meet the water filtration requirement of the electrode assembly 1 for raw water, when designing the power supply for the electrode assembly 1, the positive electrode sheet and the negative electrode sheet can be alternately arranged in sequence in the stacking direction, the insulating sheet 11 is sandwiched between the positive electrode sheet and the negative electrode sheet, and the current collector layer 121 of the positive electrode sheet is electrically connected to the positive electrode of the power supply, and the current collector layer 121 of the negative electrode sheet is electrically connected to the negative electrode of the power supply. When the number of electrode sheets 12 is equal to two layers, the insulating sheet 11 can be directly sandwiched between the positive electrode sheet and the negative electrode sheet.

[0056] For the electrode sheet 12, the current collector layer 121 of the electrode sheet 12 can be made of metal or graphite material, so that the current collector layer 121 forms a conductive layer, and the adsorption layer 122 of the electrode sheet 12 can be made of activated carbon and other adsorption materials to adsorb ions in the raw water.

[0057] At the same time, the insulating sheet 11 can be made of plastic material. The insulating sheet 11 is used to play a supporting role between the positive electrode sheet and the negative electrode sheet, not only preventing the positive electrode sheet and the negative electrode sheet from being short-circuited, but also ensuring that a water passage 100 is formed between the positive electrode sheet and the negative electrode sheet.

[0058] In practical applications, the operation of the capacitive deionization filter element includes an adsorption purification process and a desorption regeneration process. When adjacent two layers of electrode plates 12 are electrically connected to the positive and negative electrodes of the power supply and the power supply is started to supply power, anions and cations in the raw water are attracted to the electrode plates 12 with opposite charges and adsorbed by the adsorption layer 122 on the electrode plates 12. This working process of the capacitive deionization filter element is the adsorption purification process.

[0059] Correspondingly, when the power supply is stopped or a reverse voltage is applied to adjacent two layers of electrode plates 12, the ions adsorbed by the adsorption layer 122 dissociate into the water body in the water passage 100. At this time, the water passage 100 outputs concentrated water with a higher ion concentration.

[0060] As can be seen from the above, for the capacitive deionization filter element shown in this embodiment, by providing the adsorption layer 122 on the front and back sides of the current collector layer 121, an integrated design of the electrode plate 12 is realized. Only by stacking the electrode plates 12 and the insulating sheets 11 in an alternating arrangement can the electrode assembly 1 be formed. This stacked arrangement design of the electrode assembly 1 simplifies the arrangement structure of the electrode assembly 1, is convenient for processing and production, and is beneficial to reducing production costs.

[0061] Meanwhile, in practical applications, only by electrically connecting adjacent two layers of electrode plates 12 to the positive and negative electrodes of the power supply can the ions in the raw water passing through the water passage 100 be adsorbed, achieving the purpose of purifying the raw water. Since the adsorption layer 122 is provided on both sides of the current collector layer 121 of each electrode plate 12, both sides of each electrode plate 12 can adsorb ions, thus ensuring the purification effect of the raw water to a certain extent. The capacitive deionization filter element can effectively remove heavy metal ions in water and retain the beneficial ions required by the human body, meeting the needs of household water purification.

[0062] In some embodiments, as Figure 3 , Figure 4 and Figure 5 shown, the capacitive deionization filter element further includes: a central column 2. The central column 2 has a water outlet channel 21 and water passing holes 22 communicating with the water outlet channel 21. The water passing holes 22 are provided on the peripheral wall of the central column 2;

[0063] The electrode assembly 1 is wound around the peripheral wall of the central column 2. Both ends of the electrode assembly 1 along the axial direction of the central column 2 are sealed. The inner and outer ends of the electrode assembly 1 relative to the central column 2 are correspondingly formed as a water outlet end and a water inlet end;

[0064] Wherein, the water inlet end is communicated with the water outlet end through the water passage 100. The water outlet end extends to the peripheral wall of the central column 2 and forms a fluid connection with the water passing holes 22.

[0065] It is understandable that the central column 2 can be configured as a tubular structure, with a water outlet channel 21 formed inside the central column 2. One end of the central column 2 is blocked, and the other end is provided with a water flow outlet communicating with the water outlet channel 21. Sealing layers can be provided at both axial ends of the electrode assembly 1 along the central column 2 to achieve the sealing of both axial ends of the electrode assembly 1 along the central column 2. The material of the sealing layer can be epoxy resin glue.

[0066] To ensure the connection effect between the water outlet end of the electrode assembly 1 and the water outlet channel 21, multiple water passing holes 22 can be provided. The multiple water passing holes 22 can be evenly arranged on the circumferential wall of the central column 2, and each water passing hole 22 is provided in the winding area of the central column 2 corresponding to the electrode assembly 1.

[0067] The winding operation of the electrode assembly 1 is as follows: Before winding the electrode assembly 1, the insulating sheets 11 and the electrode sheets 12 are stacked in an alternating arrangement along the stacking direction.

[0068] When winding the electrode assembly 1, the inner wall surface near the water outlet end of the electrode assembly 1 is attached to the circumferential wall of the central column 2, ensuring that the water outlet end is opposite to a row of water passing holes 22 on the central column 2, and then the electrode assembly 1 is wound along the circumferential direction of the central column 2 until the electrode assembly 1 is wound into a cylindrical shape.

[0069] Therefore, according to the winding shape of the electrode assembly 1, the water passing channel 100 inside the electrode assembly 1 extends along a spiral trajectory, the outer end of the electrode assembly 1 is formed as the water inlet end, and the inner end of the electrode assembly 1 is formed as the water outlet end.

[0070] In practical applications, when purifying raw water, the raw water enters the water passing channel 100 from the water inlet end of the electrode assembly 1. Under the action of the electric field between adjacent layers of electrode sheets 12, the anions and cations in the raw water are adsorbed by the adsorption layer 122 on the electrode sheets 12. The deionized purified water flows towards the water outlet end of the electrode assembly 1 under the guidance of the water passing channel 100, then enters the water outlet channel 21 from the water passing holes 22, and finally is output from the water outlet channel 21.

[0071] In some embodiments, the central column 2 further has a water outlet port communicating with the water outlet channel 21. The water outlet port is provided at the first end of the central column 2, and the water passing holes 22 are provided on the circumferential wall near the second end of the central column 2. Among them, the water outlet port is configured to communicate with the water outlet 33 of the capacitive deionization filter element.

[0072] By arranging the water passing holes 22 on the peripheral wall near the second end of the central column 2, the water passing holes 22 are set far away from the water outlet port. This design can limit the water body output from the inner side of the electrode assembly to gradually converge towards the area where the water passing holes 22 are located, and then pass through the water passing holes 22, the water outlet channel 21 and the water outlet port in sequence. During the process of water body flow, since the water passing holes 22 are set far away from the water outlet port, the flowing water body will gradually converge towards the area where the water passing holes 22 are located, which will gradually squeeze the bubbles generated in the electrode assembly towards the area where the water passing holes 22 are located, then enter the water outlet channel 21 from the water passing holes 22, and be discharged together with the water body, thereby effectively removing the bubbles appearing in the capacitive deionization filter element.

[0073] During the desalination process of the capacitive deionization filter element, the bubbles generated in the filter element can be effectively discharged, which can prevent the capacitive deionization filter element from generating noise during operation, ensure the stability of the internal electric field of the electrode assembly, and thus ensure the water purification treatment effect of the capacitive deionization filter element.

[0074] In some embodiments, a diversion groove is provided on the peripheral wall of the central column 2, and a fluid communication is formed between the diversion groove and the water passing holes 22.

[0075] It can be understood that by providing a diversion groove on the peripheral wall of the central column 2, the situation that the gap between the inner side of the electrode assembly and the peripheral wall of the central column 2 is too small to cause water flow restriction can be avoided, so as to facilitate collecting the purified water output from the inner side of the electrode assembly by using the diversion groove, and then diverting the collected purified water to the water passing holes 22.

[0076] Among them, the depth of the diversion groove can be set to 2 - 5 mm.

[0077] In some embodiments, since the length of the central column 2 is substantially the same as the length of the electrode assembly along the axial direction of the central axis, one end of the diversion groove is provided on the peripheral wall near the first end of the central column 2, and the other end is provided on the peripheral wall near the second end of the central column 2. The diversion groove can effectively collect the purified water output from the inner side of the electrode assembly at various positions along the axial direction of the central column 2, ensuring the diversion effect on the purified water.

[0078] Among them, the diversion groove can be configured to be arranged on the peripheral wall of the central column 2 along a spiral track or along a straight track, and no specific limitation is made on this.

[0079] Preferably, the diversion groove is configured to extend along the axial direction of the central column 2. This design can effectively reduce the diversion path of the purified water and is also convenient for machining the diversion groove.

[0080] In some embodiments, in order to ensure the purification effect of raw water, two adjacent electrode sheets 12 are arranged opposite to each other along the stacking direction, so as to ensure the coverage range of the electric field between two adjacent electrode sheets 12 as much as possible, and then remove anions and cations in the raw water based on the electric field between two adjacent electrode sheets 12.

[0081] Furthermore, by arranging the insulating sheet 11 and the electrode sheet 12 to be offset along the stacking direction, the electrode sheet 12 can be hidden between two adjacent insulating sheets 11. This design not only ensures the electrical isolation between two adjacent electrode sheets 12, but also facilitates setting the water outlet end of the electrode assembly 1 at a position opposite to the water passing holes 22 on the peripheral wall of the central column 2, ensuring that the water passing channel 100 in the electrode assembly 1 and the water outlet channel 21 in the central column 2 are kept in fluid communication. Wherein, the stacking direction is along the thickness direction of the insulating sheet 11 or the electrode sheet 12.

[0082] In some embodiments, as Figure 4 shown, multiple groups of water passing holes 22 are arranged on the peripheral wall of the central column 2 along the circumferential direction. For example, multiple groups of water passing holes 22 are evenly arranged along the circumferential direction of the central column 2; each group of water passing holes 22 is arranged along the axial direction of the central column 2; the number of the electrode sheets 12 is greater than two, so that the electrode assembly 1 forms multiple water passing channels 100, and the inner ends of the electrode assembly 1 form multiple water outlet ends corresponding to the multiple water passing channels 100, and the multiple water outlet ends are arranged opposite to the multiple groups of water passing holes 22.

[0083] It can be understood that by setting the number of the electrode sheets 12 to be greater than two, based on the multiple water passing channels 100 formed by the electrode assembly 1, the raw water flowing through multiple paths in the capacitive deionization filter element can be purified simultaneously, improving the purification efficiency of the raw water.

[0084] Meanwhile, by setting the multiple water outlet ends to be arranged opposite to the multiple groups of water passing holes 22, the smoothness of the water path between each water passing channel 100 and the water outlet channel 21 in the central column 2 can be ensured, which is beneficial to ensuring the purified water outlet flow rate of the capacitive deionization filter element.

[0085] In practical applications, on the premise of ensuring the electrical isolation between two adjacent electrode sheets 12, along the extending direction of the electrode sheet 12, the insulating sheet 11 and the end parts of the electrode sheet 12 at one end of the electrode assembly 1 close to the central column 2 are arranged to be offset in turn and arranged along the circumferential direction of the central column 2.

[0086] In some embodiments, the capacitive deionization filter element further includes: a central column 2; an electrode assembly 1 is wound around the peripheral wall of the central column 2, and the central column 2 can provide support for the wound electrode assembly 1, ensuring the stability of the whole capacitive deionization filter element.

[0087] Meanwhile, the electrode assembly 1 has a water inlet end and a water outlet end, which are axially arranged at both ends of the electrode assembly 1 along the central column 2, and the water inlet end is communicated with the water outlet end through a water passage 100.

[0088] In practical applications, after the raw water enters the water passage 100 between two adjacent electrode plates 12 from the water inlet end, it will flow through the water passage 100 along the axial direction of the central column 2. At the same time, under the action of the electric field between two adjacent layers of electrode plates 12, the anions and cations in the raw water are adsorbed by the adsorption layer 122 on the electrode plates 12, and the deionized purified water flows out from the water outlet end of the electrode assembly 1.

[0089] In some embodiments, as Figure 3 and Figure 7 shown, in order to facilitate the connection of two adjacent electrode plates 12 to the positive and negative electrodes of the power supply, the electrode assembly 1 further includes: a positive electrode tab 101 and a negative electrode tab 102; the positive electrode tab 101 is electrically connected to the current collector layer 121 of the positive electrode plate; the negative electrode tab 102 is electrically connected to the current collector layer 121 of the negative electrode plate.

[0090] As Figure 4 and Figure 5 shown, a first extension portion is provided on one side edge of the current collector layer 121 of each positive electrode plate, and a second extension portion is provided on one side edge of the current collector layer 121 of each negative electrode plate; when the electrode assembly 1 is wound around the peripheral wall of the central column 2, the first extension portions of the respective positive electrode plates are stacked to form the positive electrode tab 101, and the second extension portions of the respective negative electrode plates are stacked to form the negative electrode tab 102.

[0091] In some embodiments, the current collector layer 121 includes any one of copper foil, titanium foil, and graphite paper, and the current collector layer 121 is configured to be electrically connected to the positive or negative electrode of the power supply.

[0092] The adsorption layer 122 is attached to the surface of the current collector layer 121, and the adsorption layer 122 includes an activated carbon layer, which has excellent adsorption performance and can adsorb ions in the raw water.

[0093] In some embodiments, since the thickness of the current collector layer 121 of the electrode plate 12 determines the support strength, winding difficulty, and cost of the electrode plate 12, if the current collector layer 121 is too thin, the current collector layer 121 is easily damaged, and if the current collector layer 121 is too thick, the cost of the electrode plate 12 is too high. Therefore, the thickness of the current collector layer 121 is set to 15 - 50 microns; optionally, the thickness of the current collector layer 121 is specifically 25 microns, 30 microns, 35 microns, 40 microns, 45 microns, 50 microns, etc.

[0094] Meanwhile, since the thickness of the adsorption layer 122 of the electrode sheet 12 determines the adsorption capacity and adsorption speed, however, if the adsorption layer 122 is too thick, the adsorption layer 122 will crack during winding. Therefore, the thickness of the adsorption layer 122 is set to be 25-200 microns; optionally, the thickness of the adsorption layer 122 is specifically 25 microns, 30 microns, 50 microns, 65 microns, 100 microns, 150 microns, 185 microns, 200 microns, etc.

[0095] In some embodiments, the insulating sheet 11 can be configured as a porous structure. For example, the insulating sheet 11 includes insulating fabric or insulating grid. The insulating fabric can be woven fabric or meltblown fabric.

[0096] Thus, although the insulating sheet 11 is disposed in the water passage 100, however, since the insulating sheet 11 is a porous structure, the insulating sheet 11 does not affect the migration of ions between two adjacent electrode sheets 12, and thus does not affect the adsorption of ions in the water body by the adsorption layer 122 of the electrode sheet 12. On the contrary, the insulating sheet 11 can ensure the uniform flow of water in the water passage 100, and can ensure the adsorption effect of the adsorption layer 122 on ions to a certain extent.

[0097] In some embodiments, considering that the greater the thickness of the insulating sheet 11, the smaller the water flow pressure loss and the lower the clogging risk. However, the greater the thickness of the insulating sheet 11, the greater the distance between two adjacent electrode sheets 12, and thus the greater the resistance between two adjacent electrode sheets 12, resulting in poorer water purification performance. Therefore, in order to comprehensively consider the pressure loss and water purification effect, the thickness of the insulating sheet 11 is set to be 0.1-1.0 mm; optionally, the thickness of the insulating sheet 11 is specifically set to 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1.0 mm, etc.

[0098] In some embodiments, as Figure 6 , Figure 7 and Figure 8 shown, the capacitive deionization filter element further includes: a housing 3, the housing 3 having a receiving cavity 31 and a water inlet 32 and a water outlet 33 communicating with the receiving cavity 31;

[0099] The electrode assembly 1 is disposed in the receiving cavity 31, and the electrode assembly 1 is used for purifying the raw water input into the receiving cavity 31 through the water inlet 32, and the purified water after purification is discharged from the water outlet 33.

[0100] Specifically, the housing 3 is cylindrical, the electrode assembly 1 is wound around the circumferential wall of the central column 2, and is coaxially arranged with the housing 3; the water inlet 32 and the water outlet 33 can be arranged at the same end of the housing 3, the water outlet 33 is coaxially arranged with the central column 2, and is communicated with the water outlet channel 21 of the central column 2.

[0101] Meanwhile, the water inlet 32 is arranged on one side of the water outlet 33. After the raw water is input from the water inlet 32 into the accommodating cavity 31, the raw water enters the water passing channel 100 through the water inlet end on the side wall of the electrode assembly 1, and undergoes deionization treatment of the positive and negative electrode plates during the process of flowing through the water passing channel 100. The purified water after purification treatment sequentially passes through the water outlet end of the electrode assembly 1 and the water passing holes 22 on the central column 2, then enters the water outlet channel 21, and finally is discharged from the water outlet 33.

[0102] In some embodiments, the capacitive deionization filter element is further configured with a power connection assembly 4. The power connection assembly 4 includes a positive terminal 41 and a negative terminal 42. At least part of the positive terminal 41 and at least part of the negative terminal 42 are exposed on the housing 3. The positive terminal 41 is electrically connected to the positive electrode lug 101 of the electrode assembly 1, and the negative terminal 42 is electrically connected to the negative electrode lug 102 of the electrode assembly 1. This design facilitates the power supply to apply voltage to the positive and negative electrode plates through the power connection assembly 4.

[0103] In a second aspect, an embodiment of the present invention further provides a water purification device, including: a machine body and the capacitive deionization filter element as above; the machine body has an installation cavity, and the capacitive deionization filter element is detachably arranged in the installation cavity.

[0104] Specifically, the water purification device can be an instant hot water dispenser. The machine body can be provided with an installation opening communicated with the installation cavity, and the capacitive deionization filter element can be inserted into the installation cavity through the installation opening.

[0105] Since the water purification device includes the capacitive deionization filter element, and the specific structure of the capacitive deionization filter element refers to the above embodiments, the water purification device of this embodiment includes all the technical solutions of the above embodiments. Therefore, it has at least all the beneficial effects obtained by all the technical solutions of the above embodiments, which will not be elaborated here one by one.

[0106] Finally, it should be noted that the above embodiments are only used to illustrate the present invention, rather than to limit the present invention. Although the present invention has been described in detail with reference to the embodiments, those of ordinary skill in the art should understand that various combinations, modifications or equivalent replacements of the technical solutions of the present invention do not depart from the spirit and scope of the technical solutions of the present invention, and should all be covered by the scope of the claims of the present invention.

Claims

1. A capacitive deionization filter element, characterized in that, Comprising: An electrode assembly (1), comprising: an insulating sheet (11) and at least two layers of electrode sheets (12), the insulating sheet (11) and the electrode sheets (12) being arranged in a stacked manner, and the insulating sheet (11) being clamped between two adjacent layers of the electrode sheets (12); The electrode sheet (12) includes a current collector layer (121) and an adsorption layer (122), and the adsorption layer (122) is provided on both the front and back sides of the current collector layer (121); two adjacent layers of the electrode sheets (12) are respectively configured as a positive electrode sheet and a negative electrode sheet, and a water passage (100) for accommodating the insulating sheet (11) is formed between the positive electrode sheet and the negative electrode sheet.

2. The capacitive deionization filter element according to claim 1, wherein It further comprises: A central column (2) having a water outlet passage (21) and a water through hole (22) communicating with the water outlet passage (21), the water through hole (22) being provided on the peripheral wall of the central column (2); The electrode assembly (1) is wound around the peripheral wall of the central column (2), and both ends of the electrode assembly (1) along the axial direction of the central column (2) are sealed, and the inner and outer ends of the electrode assembly (1) relative to the central column (2) are correspondingly formed as a water outlet end and a water inlet end; Wherein, the water inlet end is communicated with the water outlet end through the water passage (100), and the water outlet end extends towards the peripheral wall of the central column (2) and forms a fluid communication with the water through hole (22).

3. The capacitive deionization filter element according to claim 2, wherein Two adjacent layers of the electrode sheets (12) are arranged opposite to each other in the stacking direction, and the insulating sheet (11) and the electrode sheets (12) are arranged in a staggered manner in the stacking direction, so that the electrode sheets (12) are hidden between two adjacent layers of the insulating sheets (11).

4. The capacitive deionization filter element according to claim 2, wherein A plurality of groups of the water through holes (22) are provided on the peripheral wall of the central column (2) along the circumferential direction, and each group of the water through holes (22) is arranged along the axial direction of the central column (2); The number of the electrode sheets (12) is greater than two, so that a plurality of water passages (100) are formed in the electrode assembly (1); a plurality of water outlet ends corresponding to the plurality of water passages (100) are formed at the inner end of the electrode assembly (1), and the plurality of water outlet ends are arranged opposite to the plurality of groups of the water through holes (22).

5. The capacitive deionization filter element according to claim 1, wherein, It further comprises: A central column (2), the electrode assembly (1) being wound around the peripheral wall of the central column (2); The electrode assembly (1) has a water inlet end and a water outlet end, the water inlet end and the water outlet end are oppositely arranged at both ends of the electrode assembly (1) along the axial direction of the central column (2), and the water inlet end is communicated with the water outlet end through the water passage (100).

6. The capacitive deionization filter element according to claim 1, characterized in that The electrode assembly (1) further comprises: a positive electrode tab (101) electrically connected to the current collector layer (121) of the positive electrode sheet; A negative electrode tab (102) electrically connected to the current collector layer (121) of the negative electrode sheet.

7. The capacitive deionization filter element according to any one of claims 1 to 6, characterized in that, The current collector layer (121) includes any one of copper foil, titanium foil and graphite paper, and the adsorption layer (122) includes an activated carbon layer.

8. The capacitive deionization filter element according to any one of claims 1 to 6, characterized in that, The thickness of the current collector layer (121) is 15 - 50 microns, and the thickness of the adsorption layer (122) is 25 - 200 microns.

9. The capacitive deionization filter element according to any one of claims 1 to 6, characterized in that, The insulating sheet (11) has a porous structure.

10. The capacitive deionization filter element according to claim 9, characterized in that, The thickness of the insulating sheet (11) is 0.1 - 1.0 mm.

11. The capacitive deionization filter element according to any one of claims 1 to 6, characterized in that, It further includes: A housing (3) having a receiving cavity (31), a water inlet (32) and a water outlet (33) communicating with the receiving cavity (31); The electrode assembly (1) is disposed in the receiving cavity (31). The electrode assembly (1) is used to purify the raw water input into the receiving cavity (31) through the water inlet (32), and the purified water after purification is discharged from the water outlet (33).

12. A water purification device, characterized in that, It includes: A body and the capacitive deionization filter element according to any one of claims 1 to 11; The body has an installation cavity, and the capacitive deionization filter element is detachably disposed in the installation cavity.

Images