Electrochemical deintercalation device

Abstract

The utility model discloses an electrochemical de-embedding device, which comprises an electrolytic bath laminated structure, the electrolytic bath laminated structure is formed by alternately laminating and arranging cathode plates and anode plates, the first cathode plate and the last anode plate are used as end polar plates, and runner structures are arranged on a single surface of each end polar plate and double surfaces of the other cathode plates and anode plates. A first inlet / outlet, a second inlet / outlet and an overflowing opening are formed in each cathode plate and each anode plate, the first inlet / outlet is communicated with the second inlet / outlet through a runner structure, the overflowing opening is positioned outside the runner structure, and the first inlet / outlet and the second inlet / outlet are respectively communicated with the overflowing opening in the adjacent polar plate; and an ion exchange membrane is arranged between the cathode plate and the anode plate. The utility model relates to a multi-pole parallel flow electrified de-intercalation device for extracting lithium from a salt lake, which has the advantages of large treatment capacity, convenience in assembly and maintenance, high lithium extraction efficiency and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of salt lake lithium extraction equipment, in particular to an electrochemical deintercalation device. Background Art

[0002] Salt lake electrical deintercalation and lithium extraction technology belongs to the field of emerging technologies. The technology is still immature and there are few equipments that can be used as reference. At present, the main electrical deintercalation equipment is in the form of pole piece coating, that is, iron phosphate (lithium iron phosphate) is coated on the cathode (anode) plate. Driven by an external current, the iron phosphate on the cathode side obtains an electron and absorbs lithium ions from the salt lake to become lithium iron phosphate. The lithium iron phosphate on the anode side loses an electron and releases lithium ions into the lithium-rich liquid (initially pure water). After most of the cathode side is converted into lithium iron phosphate and most of the anode side is converted into iron phosphate, the polarity of the power supply is reversed, and the salt lake water and lithium-rich liquid are extracted and exchanged. The iron phosphate produced in the previous process continues to absorb lithium from the salt lake water, and the lithium iron phosphate continues to release lithium into the lithium-rich liquid. After several cycles, the lithium concentration in the lithium-rich liquid becomes higher and higher.

[0003] There are also magnesium ions and sodium ions in the salt lake. Magnesium ions are divalent and will not react with iron phosphate. Sodium ions have a larger radius and are difficult to enter the lattice gap of iron phosphate. Therefore, magnesium and sodium are rarely adsorbed by iron phosphate, and only lithium ions are adsorbed in large quantities. In order to complete the conduction of current, the cathode and cathode are separated by a monovalent anion exchange membrane. For every lithium ion adsorbed by the cathode iron phosphate, a chloride ion passes from the cathode through the anion exchange membrane to the anode, and combines with the lithium ions released by the lithium iron phosphate in the anode lithium-rich liquid to form electrically neutral lithium chloride. Therefore, the lithium-rich liquid is a relatively pure lithium chloride solution. When the lithium chloride content in the lithium-rich liquid reaches a certain level, the lithium-rich liquid is taken out, and the purpose of extracting lithium from the salt lake is achieved.

[0004] However, the above method has certain defects. For example, the coating material on the pole piece cannot be too thick, otherwise the lithium ions cannot penetrate deep into the pole piece, reducing the amount of lithium absorbed by the coating material; the coating material and the salt lake water are only in contact with the pole piece surface, the adsorption area is small, and the lithium extraction efficiency is low. The pole piece is not easy to disassemble and assemble. Once the coating material is damaged and fails, the entire device needs to be disassembled, the pole piece needs to be taken out, the material needs to be scraped off and re-coated, which is very cumbersome. Utility Model Content

[0005] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model proposes a multi-electrode parallel flow electrochemical deintercalation device for lithium extraction from salt lakes, which has strong sealing, large processing capacity, is easy to assemble and maintain, and has high lithium extraction efficiency.

[0006] The technical solution of the utility model is as follows: an electrochemical deintercalation device comprises an electrolytic cell stacking structure, wherein the electrolytic cell stacking structure is composed of cathode plates and anode plates alternately stacked and arranged, wherein the first cathode plate and the last anode plate are used as end plates, a flow channel structure is provided on a single side of the end plate and on both sides of the remaining cathode plates and anode plates, a first inlet and outlet, a second inlet and outlet and a flow port are provided on each cathode plate and anode plate, the first inlet and outlet and the second inlet are connected through the flow channel structure, the flow port is located outside the flow channel structure, the first inlet and outlet and the second inlet are respectively connected to the flow ports on adjacent plates, an ion exchange membrane is provided between the cathode plate and the anode plate, a side of the end plate having the flow channel structure faces the ion exchange membrane, holes are provided on the ion exchange membrane and the positions of the holes correspond one to one with the positions of the first inlet and outlet, the second inlet and outlet and the flow port, each cathode plate and anode plate is provided with a pole ear, and an insulating layer is provided on the inner surface of the flow port and the plate plane around the flow port.

[0007] It should be noted that there is no strict functional distinction between the first inlet and the second inlet in this article. They are not only for liquid inlet or only for liquid outlet. In this scheme, whether the first inlet and the second inlet are used as inlet or outlet is determined by the flow direction of the slurry. The first inlet and outlet on the same electrode plate can be used for both liquid inlet and liquid outlet.

[0008] The electrochemical deintercalation device of the utility model has at least the following beneficial effects:

[0009] 1. Iron phosphate particles + conductive carbon black particles + salt lake brine are used as cathode slurry, lithium iron phosphate particles + conductive carbon black particles + lithium-rich liquid are used as anode slurry, and the plates are arranged in an alternating manner of yin-yang-yin-anode. The cathode slurry and the anode slurry are fed from an inlet and outlet and a flow port of the end plate (cathode) respectively. The cathode slurry flows in two ways, one way flows into the flow channel structure of the end plate (cathode) and flows out from another inlet and outlet, and the other way flows forward through the flow port of the anode plate to the inlet and outlet of the next cathode plate, and then flows into the two sides of the flow channel of the cathode plate at the same time, and so on, and finally flows out from the flow port of another end plate (anode). The anode slurry is similar, except that the anode slurry first flows into the flow port of the end plate (cathode), passes through the end plate (cathode) before reaching the first anode plate, and finally flows out from the first inlet and outlet / second inlet and outlet of the other end plate (anode). The design of the flow port allows the two electrode slurries to flow only on the corresponding plates without interfering with each other. Since one side of the end plate does not contact the ion exchange membrane, two types of plates are configured, one end plate with a single-sided flow channel and one middle plate with a double-sided flow channel.

[0010] 2. During the operation of the utility model, the cathode plate and the anode plate are respectively fed with cathode slurry and anode slurry, and direct current is fed into the pole ear at the same time. The current is transmitted to the pole plate through the pole ear, and then transmitted to the slurry through the conductive carbon black particles. The iron phosphate at the cathode obtains an electron, and at the same time absorbs lithium ions from the salt lake brine to become lithium iron phosphate. The lithium iron phosphate at the anode loses an electron, and at the same time releases lithium ions into the lithium-rich liquid. After most of the cathode side is converted into lithium iron phosphate and most of the anode side is converted into iron phosphate, the cathode and cathode slurries are extracted, and the mud cake is filtered out by pressure. After the mud cake is crushed and finely ground, the iron phosphate particles are added back to the cathode, and the lithium iron phosphate particles are added back to the anode. The polarity of the power supply does not need to be reversed. The clear liquid obtained by filtering the cathode slurry is returned to the cathode, and the slurry obtained by filtering the anode slurry is returned to the anode. The power is continued to be supplied, and the cycle is repeated several times. The lithium concentration in the lithium-rich liquid becomes higher and higher. After reaching a certain level (about 6g / L), the lithium-rich liquid is extracted and filtered to obtain a clear liquid, that is, a clear liquid with a high lithium content is obtained for subsequent further lithium extraction.

[0011] 3. The utility model uses cathode slurry and anode slurry as flow electrodes and designs a multi-pole parallel flow mode. Compared with the traditional method of coating the pole piece, the iron phosphate particles in the cathode slurry are dispersed in the salt lake brine, and the contact area between the two is greatly increased, thereby increasing the amount of lithium absorbed by the adsorption material (i.e., iron phosphate particles). In addition, the cathode and anode exist in the form of liquid slurry, and there is no problem of damage to the adsorption material coating. In general, the utility model has the advantages of large processing capacity, easy assembly and maintenance, and high lithium extraction efficiency.

[0012] According to some embodiments of the utility model, a sealing rubber ring is provided between the ion exchange membrane and the cathode plate and the anode plate to prevent leakage of the electrode slurry.

[0013] According to some embodiments of the present utility model, sealing grooves for installing the sealing rubber ring are engraved on the cathode plate and the anode plate.

[0014] According to some embodiments of the present invention, an additional circle of sealing strip is provided around the flow opening to form an insulating area, and the insulating area is fully coated with insulating paint to form the insulating layer.

[0015] According to some embodiments of the utility model, sealing bridges for squeezing sealing strips on adjacent plates and sealing piers for supporting the sealing bridges are respectively provided on the flow channels near the first inlet and the second inlet, and the positions of the sealing bridges correspond to the positions of the sealing strips.

[0016] According to some embodiments of the utility model, an end partition plate and a pressure plate are sequentially provided on the outer side of the end plate, a threaded hole is opened on the end plate, a ferrule joint is installed on the threaded hole, the threaded hole is threadedly matched with the ferrule joint, and a hose for slurry inlet or outlet is connected to the ferrule joint, a first through hole is opened on the pressure plate and the first through hole can pass through the ferrule joint so that the pressure plate is pressed against the end partition plate.

[0017] According to some embodiments of the present invention, an elastic pad is provided between the end plate and the end partition, a second through hole is formed on the elastic pad, and the position of the second through hole corresponds one-to-one to the position of the threaded hole.

[0018] According to some embodiments of the utility model, the flow channel structure is directly engraved on the pole plate, and the flow channel structure consists of a first horizontal flow channel, a first trapezoidal spoiler area, a second horizontal flow channel, a second trapezoidal spoiler area and a direct current area. The first trapezoidal spoiler area is located on one side of the first inlet and outlet and is connected to the first inlet and outlet through the first horizontal flow channel. The second trapezoidal spoiler area is located on one side of the second inlet and outlet and is connected to the second inlet and outlet through the second horizontal flow channel. The direct current area is connected between the first trapezoidal spoiler area and the second trapezoidal spoiler area. A plurality of triangular prism-shaped triangular spoiler piers are distributed in the first trapezoidal spoiler area and the second trapezoidal spoiler area. A plurality of long strip-shaped flow channel ridges are provided in the direct current area, and the flow channel ridges are distributed at intervals to form a plurality of direct current channels.

[0019] According to some embodiments of the present invention, the corner formed by the edge where the first trapezoidal spoiler area connects with the first horizontal flow channel, the corner formed by the edge where the second trapezoidal spoiler area connects with the second horizontal flow channel, and the three side edges of the triangular spoiler pier are all designed with rounded corners.

[0020] According to some embodiments of the utility model, the pole lug is provided with a slot for installing a conductive bolt.

[0021] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0023] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0024] Figure 2 This is an overall exploded view of the utility model from the first perspective;

[0025] Figure 3 This is an overall exploded view of the utility model from a second viewing angle;

[0026] Figure 4 This is a schematic diagram of the overall structure of the cathode plate / anode plate of the utility model;

[0027] Figure 5 It is a partial structural schematic diagram of the cathode plate / anode plate of the utility model;

[0028] Figure 6 It is a schematic diagram of the overlapping position of the sealing bridge and the sealing strip of the utility model;

[0029] Figure 7 It is a top view of the utility model.

[0030] Figure numerals: cathode plate 100, pole ear 110, first inlet and outlet 120, second inlet and outlet 130, flow port 140, sealing bridge 150, sealing pier 151, anode plate 200, flow channel structure 300, first horizontal flow channel 310, first trapezoidal spoiler area 320, second horizontal flow channel 330, second trapezoidal spoiler area 340, direct current area 350, triangular spoiler pier 360, flow channel ridge 370, ion exchange membrane 400, sealing rubber ring 500, sealing groove 510, sealing strip 520, end partition 600, ferrule joint 610, pressure plate 700, elastic pad 800. DETAILED DESCRIPTION

[0031] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0032] In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0033] The description of first and second is only used to distinguish the technical features and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the sequence of the indicated technical features.

[0034] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0035] Reference Figure 1-7 , an electrochemical deintercalation device, comprising an electrolytic cell stacking structure, the electrolytic cell stacking structure is composed of cathode plates 100 and anode plates 200 alternately stacked, the cathode plates 100 and the anode plates 200 are both graphite plates, wherein the first cathode plate 100 and the last anode plate 200 are used as end plates, a single side of the end plate and the double sides of the remaining cathode plates 100 and anode plates 200 are engraved with a flow channel structure 300, each cathode plate 100 and anode plate 200 is provided with a first inlet and outlet 120, a second inlet and outlet 130 and two flow ports 140, wherein the first inlet and outlet 120 and the flow port 140 are located at the upper part of the plate, the second inlet and outlet 130 and the other flow port 140 are located at the lower part of the plate, and the first inlet and outlet 120 and the second inlet and outlet 130 are arranged diagonally, the two flow ports 140 are also arranged diagonally, and the first inlet and outlet 120 and the second inlet and outlet 130 are arranged diagonally. The two inlets and outlets 130 are connected through the flow channel structure 300, and the flow port 140 is located outside the flow channel structure 300. The first inlet and outlet 120 and the second inlet and outlet 130 are respectively connected to the flow ports 140 on the adjacent plates. An ion exchange membrane 400 is provided between the cathode plate 100 and the anode plate 200. The ion exchange membrane 400 is an anion membrane. The side of the end plate with the flow channel structure 300 faces the ion exchange membrane 400. Holes are opened on the ion exchange membrane 400, and the positions of the holes correspond to the positions of the first inlet and outlet 120, the second inlet and outlet 130 and the flow port 140. Each cathode plate 100 and the anode plate 200 is provided with a pole ear 110. An insulating layer is provided on the inner surface of the flow port 140 and the plate plane around the flow port 140. The insulating layer is painted with several layers of insulating paint to prevent the anode plate 200 and the cathode slurry from contacting and conducting and causing a short circuit.

[0036] Working principle: Iron phosphate particles + conductive carbon black particles + salt lake brine are used as cathode slurry, lithium iron phosphate particles + conductive carbon black particles + lithium-rich liquid are used as anode slurry, and the electrochemical deintercalation device adopts a bottom-in and top-out method. The cathode slurry and the anode slurry enter from the second inlet and outlet 130 and the flow port 140 below the end plate (cathode) respectively. The cathode slurry flows in two ways, one way flows into the flow channel structure 300 of the end plate (cathode) and flows out from the second inlet and outlet 130 above, and the other way flows forward through It passes through the flow port 140 of the anode plate 200 to reach the second inlet and outlet 130 of the next cathode plate 100, and then flows into the two-sided flow channels of the cathode plate 100 at the same time, and so on, and finally flows out from the flow port 140 above the other end plate (anode). The same is true for the anode slurry, except that the anode slurry first flows in from the flow port 140 of the end plate (cathode), passes through the end plate (cathode) before reaching the first anode plate 200, and finally flows out from the first inlet and outlet 120 above the other end plate (anode). During the operation of the device, the cathode plate 100 and the anode plate 200 are respectively fed with cathode slurry and anode slurry, and at the same time, the pole ear 110 is fed with direct current, and the current is transmitted to the pole plate through the pole ear 110, and then transmitted to the slurry through the conductive carbon black particles. The iron phosphate at the cathode obtains an electron, and at the same time absorbs lithium ions from the salt lake brine to become lithium iron phosphate, and the lithium iron phosphate at the anode loses an electron, and at the same time releases lithium ions into the lithium-rich liquid. After most of the cathode side is converted into lithium iron phosphate and most of the anode side is converted into iron phosphate, the cathode and cathode slurries are extracted and the mud cake is filtered out. After the mud cake is crushed and finely ground, the iron phosphate particles are added back to the cathode and the lithium iron phosphate particles are added back to the anode. The polarity of the power supply does not need to be reversed. The clear liquid obtained by filtering the cathode slurry is returned to the cathode, and the slurry obtained by filtering the anode slurry is returned to the anode. The power is continued to be turned on. After several cycles, the lithium concentration in the lithium-rich liquid becomes higher and higher. When it reaches a certain level (about 6g / L), the lithium-rich liquid is extracted and filtered to obtain a clear liquid, that is, a clear liquid with a high lithium content is obtained for subsequent further lithium extraction.

[0037] In some embodiments, a sealing rubber ring 500 is provided between the ion exchange membrane 400 and the cathode plate 100 and the anode plate 200 to prevent leakage of the electrode slurry. The sealing rubber ring 500 is arranged around the edge of the plate so that the flow channel structure 300, the first inlet and outlet 120, the outlet and the flow port 140 are all located in the sealing rubber ring 500. The material of the sealing rubber ring 500 can be foamed silicone rubber, foamed fluororubber or foamed EPDM rubber. In the process of pressing the anode and cathode plates 200 and the anion membrane together, the pores in the foamed rubber are squeezed, the rubber is flattened, and the flattened rubber has a rebound force, which supports the ion membrane and plays a sealing and leak-proof effect. After the foamed rubber is compressed, the volume is greatly reduced, so that the plate and the ion membrane can be closely fitted, the slurry will not seep from the plate flow channel to the plate surface, and the slurry can flow completely in the flow channel, avoiding blockage and cross-flow caused by exudation. The sealing rubber ring 500 can be formed by splicing several rubber strips into a ring body, or it can be an integral rubber ring formed in one piece. The integral rubber ring lacks the connection interface between the rubber strips, and the sealing effect is better, but it needs to be manufactured by mold opening, which is more expensive. The specific choice depends on the needs.

[0038] In some of the embodiments, the cathode plate 100 and the anode plate 200 are engraved with a sealing groove 510 for installing the sealing rubber ring 500. As an example, the cross section of the sealing groove 510 is square, 3 mm wide and 1.5 mm deep, corresponding to the sealing rubber ring 500 with a cross-sectional diameter of 3 mm placed in the sealing groove 510; the cross section of the sealing groove 510 can also be semicircular with a radius of 3 mm.

[0039] In some of the embodiments, an additional sealing strip 520 is provided around the flow port 140 to form an insulating area, and the insulating area is coated with insulating paint to form an insulating layer. The insulating area isolates the flow port 140 separately. In this way, the cathode (anode) slurry will be blocked by the sealing strip 520 after flowing out of the flow port 140, and will not penetrate into the flow channel of the anode (cathode) plate, thereby preventing the positive and negative electrodes from mixing with each other. The insulating area is coated with insulating paint to prevent the anode (cathode) plate 200 and the cathode (anode) slurry from contacting and conducting and causing a short circuit. As an example, the sealing strip 520 can be semi-annular and its two ends are in contact with the sealing rubber ring 500, thereby forming a closed insulating area; the sealing strip 520 can also be formed by surrounding the flow port 140 alone to form a closed ring.

[0040] In some embodiments, the first inlet and outlet 120 and the flow channel near the outlet are respectively provided with a sealing bridge 150 for squeezing the sealing strip 520 on the adjacent plate and a sealing pier 151 for supporting the sealing bridge 150, and the position of the sealing bridge 150 corresponds to the position of the sealing strip 520. The position of the sealing bridge 150 must just overlap with the position of the sealing strip 520 of the counter plate, such as Figure 5As shown, when the two plates are pressed together, the plate sealing bridge 150 will hold up the sealing strip 520 of the counter plate, so that the sealing strip 520 of the counter plate is squeezed to obtain a sealing squeezing force. If there is no sealing bridge 150, the sealing strip 520 of the counter plate is not compressed and cannot provide a sealing squeezing force. The slurry will penetrate into the flow channel of the counter plate from the flow port 140, and liquid cross-linking will occur. As an example, a sealing pier 151 is carved out of the plate, and the pier body is a rectangular strip. Two sealing piers 151 are parallel and spaced apart. A groove with a width of 10 mm and a depth of 2 mm is carved on the top of the pier to place the sealing bridge 150. The sealing bridge 150 uses a titanium sheet with a width of 10 mm and a thickness of 2 mm, which can be embedded in the groove of the sealing pier 151.

[0041] In some embodiments, an end plate 600 and a pressing plate 700 are sequentially provided on the outer side of the end plate, a threaded hole is provided on the end plate, a ferrule joint 610 is installed on the threaded hole, the threaded hole is threadedly matched with the ferrule joint 610, and a hose for slurry inlet or outlet is connected to the ferrule joint 610, and a first through hole is provided on the pressing plate 700, and the first through hole can pass through the ferrule joint 610 so that the pressing plate 700 is against the end plate 600. The end plate 600 is made of hard plastic such as PVC, the ferrule joint 610 is made of PP, and the pressing plate 700 is an aluminum alloy pressing plate 700, and the first through hole leaves an extension space for the ferrule joint 610 on the end plate 600. The advantage of this structure is that the slurry in and out only contacts the end plate 600, and the pressing plate 700 only has a pressing function and does not contact the slurry, thus avoiding corrosion of the aluminum alloy plate, and cheaper materials such as carbon steel can also be selected without the need to select corrosion-resistant materials.

[0042] In some of the embodiments, an elastic pad 800 is provided between the end plate and the end partition 600, and a second through hole is opened on the elastic pad 800, and the position of the second through hole corresponds to the position of the threaded hole. The elastic pad 800 is made of rubber material. During the compression process, the rubber pad can absorb pressure, which is equivalent to a buffer layer to prevent the hard graphite plate from directly colliding with the hard end partition 600 and breaking. At the same time, the rubber pad will also deform, filling the tiny pores on the end plate surface, and can play a sealing role to prevent the slurry from seeping out from the interface between the end partition 600 and the end plate. During the preparation of the device, the pressing plate 700, the end partition 600, the elastic pad 800, the end plate, the ion exchange membrane 400, and the intermediate plate are stacked up in sequence and locked with bolts to form the main membrane stack of the multi-pole parallel flow electric de-embedding device. The arrangement order of the components is: pressure plate 700-end partition plate 600-elastic pad 800-end electrode plate (cathode)-ion exchange membrane 400-anode plate 200-ion exchange membrane 400-cathode plate 100-ion exchange membrane 400-anode plate 200-...-cathode plate 100-ion exchange membrane 400-end electrode plate (anode)-elastic pad 800-end partition plate 600-pressure plate 700.

[0043] In some of the embodiments, the flow channel structure 300 is directly engraved on the electrode plate, and the flow channel structure 300 consists of a first horizontal flow channel 310, a first trapezoidal spoiler area 320, a second horizontal flow channel 330, a second trapezoidal spoiler area 340 and a direct current area 350. The first trapezoidal spoiler area 320 is located on one side of the first inlet and outlet 120 and is connected to the first inlet and outlet 120 through the first horizontal flow channel 310. The second trapezoidal spoiler area 340 is located on one side of the second inlet and outlet 130 and is connected to the second inlet and outlet 130 through the second horizontal flow channel 330. The direct current area 350 is connected between the first trapezoidal spoiler area 320 and the second trapezoidal spoiler area 340. A plurality of triangular prism-shaped triangular spoiler piers 360 are distributed in the first trapezoidal spoiler area 320 and the second trapezoidal spoiler area 340. A plurality of long strip-shaped flow channel ridges 370 are provided in the direct current area 350. The flow channel ridges 370 are distributed at intervals to form a plurality of direct current channels. The sealing bridge 150 mentioned above can span the horizontal flow channel. The spoiler pier can disturb the slurry, thereby increasing the collision probability between the active particles in the slurry and the lithium ions, increasing the efficiency of lithium ion embedding and de-embedding, and the increase in efficiency is ultimately reflected in the current. The triangular spoiler pier 360 not only disturbs the slurry, but also reduces the flow channel in the trapezoidal spoiler area and increases the slurry flow rate. These two points combined can keep the slurry particles at a higher speed and avoid siltation and blockage in the trapezoidal spoiler area. At the same time, multiple direct current channels are set between the two trapezoidal spoiler areas, and there are no obstacles in the flow channel, so the flow is smooth. Combined with the arrangement of multiple triangular spoiler piers 360 in the trapezoidal spoiler area, the hypotenuse of the trapezoidal spoiler area can guide part of the slurry to diffuse on both sides, so that even in the direct current channels on both sides, the slurry has a certain flow rate. As long as the slurry flow rate exceeds the lower limit of the siltation speed, there will be no siltation and blockage.

[0044] In some embodiments, the corner formed by the edge where the first trapezoidal spoiler area 320 and the first horizontal flow channel 310 meet, the corner formed by the edge where the second trapezoidal spoiler area 340 and the second horizontal flow channel 330 meet, and the three side edges of the triangular spoiler pier 360 are all designed with rounded corners. Figure 5 The middle arrow indicates the position, and the rounded corners can prevent the sharp corners on the flow channel structure 300 from piercing the ion membrane during the process of being pressed together with the ion membrane.

[0045] In some embodiments, the tab 110 is provided with a slot for installing a conductive bolt. The slot structure facilitates the insertion and tightening of the conductive bolt. The edge of the tab 110 can be flush with the edge of the board, increasing the conductive area and reducing the risk of high temperature runaway due to excessive local current density and strong thermal effect.

[0046] Although the technical solutions of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the technical solutions without departing from the principles and purpose of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. An electrochemical deintercalation device, characterized in that: The invention comprises an electrolytic cell stacking structure, wherein the electrolytic cell stacking structure is composed of cathode plates (100) and anode plates (200) alternately stacked, wherein the first cathode plate (100) and the last anode plate (200) serve as end plates, a flow channel structure (300) is provided on one side of the end plate and on both sides of the remaining cathode plates (100) and anode plates (200), each cathode plate (100) and anode plate (200) is provided with a first inlet and outlet (120), a second inlet and outlet (130) and a flow port (140), the first inlet and outlet (120) and the second inlet and outlet (130) are connected via the flow channel structure (300), the flow port (140) is located outside the flow channel structure (300), and the The first inlet and outlet (120) and the second inlet and outlet (130) are respectively connected to the flow ports (140) on the adjacent plates; an ion exchange membrane (400) is provided between the cathode plate (100) and the anode plate (200); a surface of the end plate having a flow channel structure (300) faces the ion exchange membrane (400); holes are provided on the ion exchange membrane (400) and the positions of the holes correspond to the positions of the first inlet and outlet (120), the second inlet and outlet (130) and the flow ports (140); a pole ear (110) is provided on each cathode plate (100) and anode plate (200); and an insulating layer is provided on the inner surface of the flow ports (140) and on the plate plane around the flow ports (140).

2. The electrochemical deintercalation device according to claim 1, characterized in that: A sealing rubber ring (500) is provided between the ion exchange membrane (400) and the cathode plate (100) and the anode plate (200) to prevent leakage of electrode slurry.

3. The electrochemical deintercalation device according to claim 2, characterized in that: The cathode plate (100) and the anode plate (200) are engraved with sealing grooves (510) for installing the sealing rubber ring (500).

4. The electrochemical deintercalation device according to claim 2, characterized in that: An additional circle of sealing strip (520) is provided around the flow opening (140) to form an insulating area, and insulating paint is applied to the insulating area to form the insulating layer.

5. The electrochemical deintercalation device according to claim 4, characterized in that: A sealing bridge (150) for squeezing the sealing strips (520) on adjacent plates and a sealing pier (151) for supporting the sealing bridge (150) are respectively provided on the flow channels near the first inlet and outlet (120) and the second inlet and outlet (130), and the position of the sealing bridge (150) corresponds to the position of the sealing strip (520).

6. The electrochemical deintercalation device according to claim 1, characterized in that: An end partition plate (600) and a pressure plate (700) are sequentially arranged on the outer side of the end plate. A threaded hole is provided on the end plate. A ferrule joint (610) is installed on the threaded hole. The threaded hole is threadably matched with the ferrule joint (610), and a hose for pulp inlet or outlet is connected to the ferrule joint (610). A first through hole is provided on the pressure plate (700), and the first through hole can pass through the ferrule joint (610) so that the pressure plate (700) is pressed against the end partition plate (600).

7. The electrochemical deintercalation device according to claim 6, characterized in that: An elastic pad (800) is provided between the end plate and the end partition (600), and a second through hole is opened on the elastic pad (800), and the position of the second through hole corresponds to the position of the threaded hole one by one.

8. The electrochemical deintercalation device according to claim 1, characterized in that: The flow channel structure (300) is directly engraved on the electrode plate, and the flow channel structure (300) is composed of a first horizontal flow channel (310), a first trapezoidal spoiler area (320), a second horizontal flow channel (330), a second trapezoidal spoiler area (340) and a direct flow area (350), wherein the first trapezoidal spoiler area (320) is located on one side of the first inlet and outlet (120) and is connected to the first inlet and outlet (120) through the first horizontal flow channel (310), and the second trapezoidal spoiler area (340) is located on the second inlet and outlet (130). ) side and is connected to the second inlet and outlet (130) through the second horizontal flow channel (330); the direct flow zone (350) is connected between the first trapezoidal spoiler zone (320) and the second trapezoidal spoiler zone (340); a plurality of triangular prism-shaped triangular spoiler piers (360) are distributed in the first trapezoidal spoiler zone (320) and the second trapezoidal spoiler zone (340); a plurality of long strip-shaped flow channel ridges (370) are provided in the direct flow zone (350); the flow channel ridges (370) are distributed at intervals to form a plurality of direct flow channels.

9. The electrochemical deintercalation device according to claim 8, characterized in that: The corner formed by the edge where the first trapezoidal spoiler area (320) and the first horizontal flow channel (310) meet, the corner formed by the edge where the second trapezoidal spoiler area (340) and the second horizontal flow channel (330) meet, and the three side edges of the triangular spoiler pier (360) are all designed with rounded corners.

10. The electrochemical deintercalation device according to claim 1, characterized in that: The pole lug (110) is provided with a slot for installing a conductive bolt.

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