Aluminum-air battery system with efficient recovery of reaction products

Abstract

The present invention discloses an aluminum-air battery system for efficiently recovering reaction products, including an ion membrane electrolysis chamber, a cyclone, and a battery stack. The ion membrane electrolysis chamber is provided with an ion membrane, which separates the ion membrane electrolysis chamber into a cathode chamber and an anode chamber. The cathode chamber is provided with a cathode plate, the anode chamber is provided with an anode plate, the ion membrane electrolysis chamber is connected to the inlet of the cyclone through a pipeline, a circulation pump is provided on the pipeline between the ion membrane electrolysis chamber and the cyclone, the top overflow port of the cyclone is connected to the battery stack through a pipeline, and the battery stack is connected to the cathode chamber and the anode chamber of the ion membrane electrolysis chamber respectively through pipelines. The present invention converts the reaction product, sodium tetrahydroxyaluminate, into water-insoluble aluminum hydroxide, separates the aluminum hydroxide from the aluminum-air battery electrolyte by solid-liquid separation, thereby completely recovering the aluminum in the electrolyte, while significantly reducing the reaction products in the electrolyte, thereby maintaining the performance of the electrolyte, and enabling the system to generate electricity efficiently for a long time.

Description

Technical Field

[0001] The present invention relates to the field of fuel cells, and more particularly, to an aluminum-air battery system for efficiently recovering reaction products. Background Art

[0002] Aluminum-air fuel cells are chemical power sources that generate electricity through a chemical reaction between aluminum and air in the presence of an electrolyte and a catalyst. Aluminum and oxygen are consumed during the power generation process. The electrolyte in aluminum-air batteries can be either neutral or alkaline, with alkaline electrolytes being the most commonly used. Commonly used alkaline electrolytes include sodium hydroxide and potassium hydroxide.

[0003] In the power generation process of alkaline aluminum-air batteries, taking sodium hydroxide electrolyte as an example, the following reactions occur:

[0004] 2Al+2NaOH+6H2O=2Na[Al(OH)4]+3H2↑ (1)

[0005] 4Al+3O2+6H2O+4OH - =4Al(OH)4 - (2)

[0006] 2Al+6H2O=2AlOH3↓+3H2↑ (3)

[0007] The anode aluminum of the battery cell reacts with the sodium hydroxide in the electrolyte to generate sodium tetrahydroxyaluminate Na[Al(OH)4], as shown in reaction formula (1). For aqueous electrolyte aluminum-air batteries, there is also a reaction shown in reaction formula (3), in which the anode aluminum reacts with the water in the electrolyte to generate aluminum hydroxide Al(OH)3. In the aqueous solution, sodium tetrahydroxyaluminate Na[Al(OH)4] is converted to Na + and Al(OH)4 - Moreover, in the above reaction, the reaction of generating sodium tetrahydroxyaluminate is the main reaction, and the reaction of generating aluminum hydroxide is the side reaction. Therefore, a large amount of sodium tetrahydroxyaluminate exists in the reaction product, and sodium tetrahydroxyaluminate dissolves in the electrolyte. At the same time, a small amount of aluminum hydroxide Al(OH)3 also exists.

[0008] Al(OH)3 is insoluble in water, so as the aluminum-air battery generates electricity, the electrolyte contains more and more products. In the case of an aluminum-air battery system with circulating electrolyte, tiny reaction product Al(OH)3 particles circulate along with the electrolyte solution. Since Al(OH)3 exists in a solid state rather than a dissolved state in the electrolyte, when it flows through the battery cells, the tiny Al(OH)3 particles will adhere to the electrodes, thereby reducing the system's power generation efficiency and output power.

[0009] Furthermore, as the reaction progresses and the aluminum anode is consumed, the electrolyte contains more and more products, the electrolyte's conductivity decreases, and the system's power generation capacity decreases. As the reaction products in the electrolyte liquid increase, the reactants gradually decrease, and the probability of contact between the aluminum anode and the reactants decreases, resulting in increasingly lower system efficiency. Therefore, to maintain system efficiency, the existing technology is to periodically replace the entire stack, discarding the post-reaction electrolyte and replacing it with a new one. This approach is not suitable for frequent use, such as in automobiles.

[0010] Among the chemical reaction products of aluminum-air battery power generation, aluminum hydroxide is a usable substance that can be recycled and used as a flame retardant and medicine. It can also be heated to obtain aluminum oxide, which can be further processed to obtain aluminum. The recycled aluminum can be used to generate electricity again, thus forming the renewable use of aluminum-air fuel cells.

[0011] The reaction product of the power generation process, aluminum hydroxide, is insoluble in water, so it can be obtained through solid-liquid separation to reduce the amount of aluminum hydroxide in the electrolyte. However, solid-liquid separation cannot separate the main reaction product, sodium tetrahydroxyaluminate. Sodium tetrahydroxyaluminate is still in the electrolyte and participates in the electrolyte circulation. As power generation proceeds, the performance of the electrolyte gradually decreases due to the increasing amount of sodium tetrahydroxyaluminate, the reaction product, and the power generation efficiency of the system. At the same time, due to the large amount of aluminum in the form of Al(OH)4 - exists in the form of and cannot be recycled.

[0012] Therefore, solving the problem of recycling reaction products during the power generation process of aluminum-air battery systems, especially solving the problem of recycling aluminum in the main product sodium tetrahydroxyaluminate, thereby reducing the reaction products in the electrolyte, maintaining the performance of the electrolyte, and enabling the system to generate electricity efficiently for a long time, has become one of the key issues in this field that needs to be addressed urgently. Summary of the Invention

[0013] In order to solve the problems in existing aluminum-air battery systems, such as the gradual decline in electrolyte performance and system power generation efficiency caused by the increase in reaction products as the power generation reaction proceeds, the present invention innovatively provides an aluminum-air battery system that efficiently recovers reaction products, converts sodium tetrahydroxyaluminate into water-insoluble aluminum hydroxide, and separates the aluminum hydroxide from the electrolyte of the aluminum-air battery through solid-liquid separation, so that all the aluminum in the electrolyte is recovered, while significantly reducing the reaction products in the electrolyte, thereby maintaining the performance of the electrolyte and enabling the system to generate electricity efficiently for a long time.

[0014] To achieve the above-mentioned technical objectives, the present invention discloses an aluminum-air battery system for efficiently recovering reaction products, comprising: an ion membrane electrolysis chamber, a cyclone and a battery stack, wherein an ion membrane is provided in the ion membrane electrolysis chamber, the ion membrane separates the ion membrane electrolysis chamber into a cathode chamber and an anode chamber, the cathode chamber is provided with a cathode plate, the anode chamber is provided with an anode plate, the ion membrane electrolysis chamber is connected to the inlet of the cyclone through a pipeline, a circulation pump is provided on the pipeline between the ion membrane electrolysis chamber and the cyclone, the top overflow port of the cyclone is connected to the battery stack through a pipeline, and the battery stack is connected to the cathode chamber and the anode chamber of the ion membrane electrolysis chamber respectively through pipelines.

[0015] Furthermore, the cathode chamber and the anode chamber are connected via a connecting pipe, and a first solenoid valve is provided on the connecting pipe.

[0016] Furthermore, a radiator is provided on the pipeline between the battery stack and the ion membrane electrolysis compartment, and a plurality of cooling fans are provided below the radiator.

[0017] Furthermore, the pipeline between the battery stack and the ion membrane electrolysis compartment includes a first pipeline, a tee, a second pipeline and a third pipeline. The first end of the first pipeline is connected to the battery stack, the second end of the first pipeline is connected to the tee, and the other two ends of the tee are respectively connected to the second pipeline and the third pipeline. The second pipeline is connected to the anode chamber, the third pipeline is connected to the cathode chamber, and the third pipeline is provided with a second solenoid valve.

[0018] Furthermore, a filtering and recovering device is provided below the cyclone, and the filtering and recovering device is provided above the anode chamber.

[0019] Furthermore, the filtering and recovering device includes an L-shaped filtering layer, which is fixed on the side wall of the ion membrane electrolysis compartment. The L-shaped filtering layer and the side wall of the ion membrane electrolysis compartment form a filtering tank.

[0020] Furthermore, a reactant collection net is detachably connected to the filter tank formed by the L-shaped filter layer and the side wall of the ion membrane electrolysis chamber.

[0021] Furthermore, the bottom and sides of the L-shaped filter layer are provided with filter holes, the filter holes at the bottom of the L-shaped filter layer have the same aperture, and the filter holes at the sides of the L-shaped filter layer have apertures that gradually increase from bottom to top.

[0022] Furthermore, a cover plate is provided above the ion membrane electrolysis chamber, and the cover plate is used to fix the cathode plate, the ion membrane and the anode plate, and the cover plate is provided with a negative electrode tab and a positive electrode tab.

[0023] Furthermore, the cover plate is provided with a plurality of oxygen exhaust holes and a plurality of hydrogen exhaust holes.

[0024] The beneficial effects of the present invention are:

[0025] (1) The aluminum-air battery system for efficiently recovering reaction products provided by the present invention converts the reaction product sodium tetrahydroxyaluminate into water-insoluble aluminum hydroxide, and separates the aluminum hydroxide from the aluminum-air battery electrolyte through solid-liquid separation, thereby completely recovering the aluminum in the electrolyte and significantly reducing the reaction products in the electrolyte, thereby maintaining the performance of the electrolyte and enabling the system to generate electricity efficiently over a long period of time.

[0026] (2) The aluminum-air battery system provided by the present invention can efficiently recover reaction products. The electrolyte carried in the separated aluminum hydroxide is filtered and recycled through a filtering and recovery device, and then continues to participate in the chemical reaction to realize the recycling of the electrolyte, thereby further ensuring that the battery system is in a high-efficiency operation state for a long time.

[0027] (3) The aluminum-air battery system provided by the present invention can efficiently recover the reaction products, and recover part of the reaction substance NaOH used for power generation through ion membrane electrolysis, which is conducive to maintaining the efficient power generation of the system for a long time. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic structural diagram of the aluminum-air battery system for efficiently recovering reaction products of the present invention.

[0029] Figure 2 for Na + Schematic diagram of selective electromigration across an ion membrane.

[0030] Figure 3 Schematic diagram of the principle of ion membrane electrolysis.

[0031] Figure 4 Schematic diagram of the connection between the cover plate and the ion membrane electrolysis chamber.

[0032] Figure 5 This is a top view of the ion membrane electrolysis compartment.

[0033] Figure 6 This is a bottom view of the cover.

[0034] In the figure,

[0035] 1. Ion membrane electrolysis chamber; 2. Cyclone; 3. Battery stack; 4. Radiator; 5. Cathode chamber; 6. Anode chamber; 7. Circulation pump; 8. L-shaped filter layer; 9. Reactant collection net; 10. Cover plate; 11. Ion membrane; 12. Cathode plate; 13. Anode plate; 14. First solenoid valve; 15. First pipeline; 16. Tee; 17. Second pipeline; 18. Third pipeline; 19. Second solenoid valve; 41. Cooling fan; 101. Negative electrode tab; 102. Positive electrode tab; 103. Oxygen exhaust hole; 104. Hydrogen exhaust hole; 105. Cathode plate fixing groove; 106. Ion membrane fixing groove; 107. Anode plate fixing groove. DETAILED DESCRIPTION

[0036] The aluminum-air battery system for efficiently recovering reaction products provided by the present invention is explained and illustrated in detail below in conjunction with the drawings in the specification.

[0037] like Figure 1 As shown, this embodiment specifically discloses an aluminum-air battery system for efficiently recovering reaction products, including: an ion membrane electrolysis compartment 1, a cyclone 2 and a battery stack 3. An ion membrane 11 is provided in the ion membrane electrolysis compartment 1, and the ion membrane 11 separates the ion membrane electrolysis compartment 1 into a cathode chamber 5 and an anode chamber 6. A cathode plate 12 is provided in the cathode chamber 5, and an anode plate 13 is provided in the anode chamber 6. The ion membrane electrolysis compartment 1 is connected to the inlet of the cyclone 2 through a pipeline, and a circulation pump 7 is provided on the pipeline between the ion membrane electrolysis compartment 1 and the cyclone 2. The top overflow port of the cyclone 2 is connected to the battery stack 3 through a pipeline, and the battery stack 3 is connected to the cathode chamber 5 and the anode chamber 6 of the ion membrane electrolysis compartment 1 through pipelines.

[0038] Before the aluminum-air battery system is started, the electrolyte is stored in the ion membrane electrolysis compartment 1, and the electrolyte is evenly distributed in the cathode chamber 5 and the anode chamber 6. The liquid levels of the cathode chamber 5 and the anode chamber 6 are the same. When the system is working, the circulation pump 7 is energized. Under the action of the circulation pump 7, the electrolyte in the ion membrane electrolysis compartment 1 is transported by the circulation pump 7, and the electrolyte flows into the cyclone 2 at a certain speed through the inlet of the cyclone 2. When the electrolyte flows through the cyclone 2, an outer vortex of downward vortex and an inner vortex of upward vortex are formed. The outer vortex is mainly composed of aluminum hydroxide with a larger specific gravity, and the inner vortex is mainly composed of electrolyte with a lighter specific gravity. Therefore, the solid phase substance aluminum hydroxide in the electrolyte is separated in the cyclone 2 and discharged through the bottom flow port. After separation, the electrolyte that does not contain aluminum hydroxide or contains less aluminum hydroxide flows out through the overflow port at the top of the cyclone 2 and enters the battery stack 3. In the battery stack 3, the electrolyte participates in power generation. During the power generation process of the battery stack 3, the main product sodium tetrahydroxyaluminate and the by-product aluminum hydroxide are continuously generated. When the electrolyte flows out of the battery stack 3, it becomes a solution rich in sodium tetrahydroxyaluminate and aluminum hydroxide. The solution rich in sodium tetrahydroxyaluminate and aluminum hydroxide enters the ion membrane electrolysis compartment 1 for ion membrane electrolysis.

[0039] The present invention adopts ion membrane electrolysis technology to convert sodium tetrahydroxyaluminate, the main product of the aluminum-air battery reaction, into aluminum hydroxide, and adopts solid-liquid separation technology to separate the aluminum hydroxide from the electrolyte, thereby realizing aluminum recovery and maintaining the performance of the electrolyte.

[0040] Principle of ion membrane electrolysis:

[0041] Preferably, the ion membrane 11 is a Nafion membrane (Nafion is a copolymer of polytetrafluoroethylene (Teflon) and perfluoro-3,6-diepoxy-4-methyl-7-decene-sulfuric acid). The internal structure of the Nafion membrane can be expressed as follows: R-SO3-H + (Na + ), where R represents a polymer structure. The active groups are negatively charged -SO3- groups and positively charged Na + Under the action of the electric field, the ion membrane 11 has the ability to selectively pass ions.

[0042] Since the sulfonic acid group is hydrophilic, the ion membrane 11 becomes loose after swelling in the solution, forming many fine curved channels, which makes Na + It can pass through the membrane. The positions of -SO3- and -COO- in the membrane are fixed, which has the effect of repelling C1 - and OH - Functions of anions (such as Figure 2 As shown), they cannot pass through the ion membrane 11. As the electrolysis proceeds, the pH value of the anode chamber solution continues to decrease, which is equivalent to the addition of acid, while the pH value of the cathode chamber continues to increase, which is equivalent to the addition of alkali. + The high selectivity and permeability of the electrolytic solution can increase the supersaturation of sodium tetrahydroxyaluminate solution to precipitate aluminum hydroxide.

[0043] like Figure 3 As shown, the anode plate is a passivated titanium plate, the cathode plate is a stainless steel plate, and the ion membrane in between is a Nafion membrane. The solution in the cathode compartment is NaOH solution, and the solution in the anode compartment is sodium tetrahydroxyaluminate solution. During electrolysis, different reactions occur in the anode and cathode compartments.

[0044] Under the action of electric field, Na + Selective electromigration occurs through the ion membrane, namely:

[0045] 4Na + (Anode chamber) → 4Na + (Cathode chamber)

[0046] H2 is released at the cathode, producing OH - , and Na migrated from the anode chamber 6 +Combined with, similar to salt electrolysis, so that a high concentration of NaOH solution can be obtained in the cathode chamber, producing OH - The reaction is as follows:

[0047] 4H2O+4e - →2H2+4OH -

[0048] The sodium tetrahydroxyaluminate solution in the anode chamber is ionized and rapidly acidified, and the following reaction occurs:

[0049] 4Na[Al(OH)4]→4Na + +4Al(OH)4 -

[0050] 4Al(OH)4 - +H2O-4e - →4AlOH3+4H2O+O2↑

[0051] The overall reaction equation for ion-exchange membrane electrolysis of sodium tetrahydroxyaluminate solution is: 4Na[Al(OH)4]+2H2O=4A1(OH)3(anode)+4NaOH(cathode)+O2(anode)+2H2(cathode)

[0052] During the ion membrane electrolysis process, the current gradually decreases as the electrolysis proceeds. When a large number of tiny crystal nuclei are precipitated, the current drops sharply and the electrolysis stops. The electrolysis process only changes the a of the sodium tetrahydroxyaluminate solution. k (caustic ratio), does not change the structure of the solution. As the electrolysis continues, H + The supersaturation of the sodium tetrahydroxyaluminate solution continues to increase, accelerating decomposition. The overall effect of electrolysis is the precipitation of Al(OH)3 nuclei and O2 in the anode chamber, while concentrated NaOH and H2 are produced in the cathode chamber. During this process, the supersaturation of the sodium tetrahydroxyaluminate solution continues to increase, and aluminum hydroxide is continuously precipitated. This method of converting sodium tetrahydroxyaluminate to aluminum hydroxide through ion-exchange membrane electrolysis is highly efficient and rapid.

[0053] The present invention treats the electrolyte in the power generation process of the aluminum-air battery system. First, the main reaction product, sodium tetrahydroxyaluminate, in the reaction liquid is converted into aluminum hydroxide through ion membrane electrolysis. The electrolyte containing aluminum hydroxide is subjected to solid-liquid separation to separate the aluminum hydroxide, thereby ensuring the properties of the electrolyte and recovering the aluminum hydroxide, achieving two goals at one stroke.

[0054] like Figure 1As shown, the cathode chamber 5 and the anode chamber 6 are connected by a connecting pipe, and a first solenoid valve 14 is provided on the connecting pipe. A radiator 4 is provided on the pipe between the battery stack 3 and the ion membrane electrolysis compartment 1, and multiple cooling fans 41 are provided below the radiator 4. The pipe between the battery stack 3 and the ion membrane electrolysis compartment 1 includes a first pipe 15, a tee pipe 16, a second pipe 17 and a third pipe 18. The first end of the first pipe 15 is connected to the battery stack 3, and the second end of the first pipe 15 is connected to the tee pipe 16. The radiator 4 is provided on the first pipe 15, and the other two ends of the tee pipe 16 are respectively connected to the second pipe 17 and the third pipe 18. The second pipe 17 is connected to the anode chamber 6, and the third pipe 18 is connected to the cathode chamber 5. A second solenoid valve 19 is provided on the third pipe 18.

[0055] The solution rich in sodium tetrahydroxyaluminate and aluminum hydroxide flowing out of the battery stack 3 is cooled in the radiator 4 provided on the first pipe 15, then flows through the first pipe 15 and into the tee 16. At the tee 16, the electrolyte can flow solely through the second pipe 17 into the anode chamber 6 of the ion-exchange membrane electrolysis compartment 1, thus completing one cycle. At the tee 16, the electrolyte can also flow simultaneously through the second pipe 17 and the third pipe 18 into the cathode chamber 5 and the anode chamber 6 of the ion-exchange membrane electrolysis compartment 1.

[0056] The first solenoid valve 14 and the second solenoid valve 19 are both normally-off solenoid valves, and are only conductive when energized. In the system, the first solenoid valve 14 and the second solenoid valve 19 are designed to be energized and de-energized at the same time. When the first solenoid valve 14 and the second solenoid valve 19 are de-energized, the cathode chamber 5 and the anode chamber 6 are not conductive, and the electrolyte from the battery stack 3 only flows into the anode chamber 6. When the first solenoid valve 14 and the second solenoid valve 19 are energized at the same time, the cathode chamber 5 and the anode chamber 6 are connected. At this time, part of the electrolyte flows into the cathode chamber 5 through the tee pipe 16, and part flows into the anode chamber 6 through the tee pipe 16. The electrolyte flowing into the cathode chamber 5 is mixed with the electrolyte formed by ion membrane electrolysis in the cathode chamber 5, and then flows into the anode chamber 6 through the connecting pipe and the first solenoid valve 14. In the anode chamber 6, the electrolyte from the cathode chamber 5 is mixed with the electrolyte from the anode chamber 6, and after mixing, it is driven by the circulation pump 7 to form a circulation.

[0057] When the aluminum-air battery system is working, the ion membrane electrolysis is started, H2 is precipitated in the cathode chamber 5, and OH is generated. - , and Na migrated from the anode chamber 6 +Combined with this, a high-concentration NaOH solution can be obtained in the cathode chamber 5. This shows that ion-exchange membrane electrolysis recovers a portion of the NaOH used for power generation, which helps maintain the system's efficient power generation over a long period of time. In the anode chamber 6, the sodium tetrahydroxyaluminate solution ionizes and rapidly acidifies, forming the product A1(OH)3. As a result, the electrolyte in the anode chamber 6 contains more aluminum hydroxide than conventional electrolytes. Consequently, during the electrolyte's circulation, the electrolyte entering the cyclone 2 contains a higher amount of solid-phase aluminum hydroxide, and after passing through the cyclone 2, more aluminum hydroxide is separated.

[0058] The electrolyte in the cathode chamber 5 can be continuously or intermittently circulated. Preferably, an intermittent circulation mode is adopted. The first solenoid valve 14 and the second solenoid valve 19 are intermittently energized or de-energized at the same time to achieve intermittent circulation of the electrolyte in the cathode chamber 5. The advantage of intermittent circulation is that the sodium hydroxide in the cathode chamber 5 is not replaced until it is enriched to a certain extent, which can improve the electrolysis efficiency and save electrolysis power.

[0059] The use of Nafion membrane as the ion membrane 11 for electrolysis can also be used in aluminum-air batteries with potassium hydroxide electrolyte. The working principle is similar to that of aluminum-air batteries with sodium hydroxide electrolyte, except that potassium hydroxide is obtained in the cathode chamber 5 during electrolysis, while aluminum hydroxide is still obtained in the anode chamber 6.

[0060] In the aluminum-air battery system for efficiently recovering reaction products of the present invention, the ion membrane electrolysis compartment 1 integrates three functions of ion membrane electrolysis, electrolyte storage and aluminum hydroxide recovery, has a simple structure, is easy to operate and saves space.

[0061] The present invention performs ion membrane electrolysis on the circulating electrolyte of the aluminum-air battery system. The electrolysis begins when the concentration of sodium tetrahydroxyaluminate in the electrolyte is not high, thereby maintaining a low concentration of sodium tetrahydroxyaluminate in the electrolyte. In this way, the high performance of the electrolyte is maintained while the power consumption of the electrolysis is very low.

[0062] like Figure 1 As shown, a filter recovery device is provided below the cyclone 2, and the filter recovery device is provided above the anode chamber 6. The filter recovery device includes an L-shaped filter layer 8, which is fixed on the side wall of the ion membrane electrolysis chamber 1. The L-shaped filter layer 8 and the side wall of the ion membrane electrolysis chamber 1 form a filter tank. A reactant collection net 9 is detachably connected to the filter tank formed by the L-shaped filter layer 8 and the side wall of the ion membrane electrolysis chamber 1. The bottom and side of the L-shaped filter layer 8 are provided with filter holes. The pore size of the filter holes at the bottom of the L-shaped filter layer 8 is the same, and the pore size of the filter holes on the side of the L-shaped filter layer 8 gradually increases from bottom to top, so that the filtration of the liquid can be increased. In particular, when there is a certain amount of reaction product at the bottom, the ability to filter through the bottom will decrease, and as the product accumulates, the filtering capacity will become smaller and smaller. At this time, the filter holes on the side gradually play a leading role.

[0063] The ion membrane electrolysis compartment 1 is divided into two parts by the ion membrane 11, one part is used as the cathode chamber 5, and the other part is used as the anode chamber 6. The filtration recovery device is set in the anode chamber 6 part and is located at the upper part of the anode chamber 6. The reactant collection net 9 is placed in the filter tank. The aluminum hydroxide discharged through the bottom flow outlet of the cyclone 2 is collected in the reactant collection net 9 for easy removal. When designing the aluminum-air battery system, the required amount of electrolyte is determined according to the system power and the duration. The size and specifications of the ion membrane electrolysis compartment 1 are determined according to the amount of electrolyte, and it is ensured that the filtration recovery device is always located above the electrolyte so that the aluminum hydroxide in the filtration recovery device can be further separated from the electrolyte by gravity.

[0064] The ion membrane electrolysis compartment 1 can have various forms, such as square or round. Its notable feature is that it is divided into two parts by the ion membrane 11, one part serving as the cathode chamber 5 and the other serving as the anode chamber 6.

[0065] like Figure 4 As shown, a cover plate 10 is provided above the ion membrane electrolysis compartment 1. The cover plate 10 is used to fix the cathode plate 12, the ion membrane 11, and the anode plate 13. The cover plate 10 is provided with a negative electrode tab 101 and a positive electrode tab 102. The negative electrode tab 101 and the positive electrode tab 102 are used to connect to the power supply required for electrolysis. When the cover plate 10 is covered on the ion membrane electrolysis compartment 1, the cathode plate 12, the ion membrane 11, and the anode plate 13 are fixed in the ion membrane electrolysis compartment 1. The ion membrane electrolysis compartment 1 is divided into two parts by the ion membrane 11. The part with the cathode plate 12 is the cathode chamber 5, and the part with the anode plate 13 is the anode chamber 6.

[0066] like Figure 5 As shown, bosses are provided on the inner sides of the front and rear walls of the ion membrane electrolysis compartment 1. Two bosses and the rear wall of the ion membrane electrolysis compartment 1 together form a groove, and the other two bosses and the front wall of the ion membrane electrolysis compartment 1 together form a groove. The two grooves are used to clamp the ion membrane 11.

[0067] When the cathode plate 12, anode plate 13 and ion membrane 11 are fixed on the cover plate 10, the cover plate 10 is closed, and the ion membrane 11 is inserted into the groove for placing the ion membrane 11 formed by the boss and the front and rear walls of the ion membrane electrolysis chamber 1, and the cathode plate 12 and anode plate 13 are also placed in place.

[0068] like Figure 6As shown, the cover plate 10 is provided with a plurality of oxygen exhaust holes 103 and a plurality of hydrogen exhaust holes 104. These holes are located in a portion of the cover plate 10 away from the ion membrane 11 to facilitate the removal of oxygen and hydrogen generated during electrolysis. The oxygen exhaust hole 103 is located to the right of the anode chamber 6, while the hydrogen exhaust hole 104 and the oxygen exhaust hole 103 are spaced a certain distance apart to prevent high concentrations of hydrogen and oxygen from interacting during operation of the aluminum-air battery system.

[0069] The cover plate 10 is also provided with a cathode plate fixing groove 105 for embedding the cathode plate 12, an ion membrane fixing groove 106 for embedding the ion membrane 11, and an anode plate fixing groove 107 for embedding the anode plate 13. The cathode plate fixing groove 105, the ion membrane fixing groove 106, and the anode plate fixing groove 107 can be grooves or through-hole grooves. During assembly, the cover plate 10 is first covered, and then the anode plate 13 is inserted into the anode plate fixing groove 107, the ion membrane 11 is inserted into the ion membrane fixing groove 106, and the cathode plate 12 is inserted into the cathode membrane fixing groove, which is more convenient for replacement and maintenance.

[0070] Since this system uses ion membrane electrolysis to treat the reaction products of the aluminum-air battery system, it recovers part of the oxygen in the electrolysis anode chamber 6. Therefore, for a closed use environment, it reduces dependence on external oxygen and is more suitable for a closed use environment.

[0071] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships 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, 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, and therefore should not be understood as limiting the present invention.

[0072] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0073] In the description of this specification, the reference terms "this embodiment", "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions 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 an appropriate manner in any at least one embodiment or example. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples, unless they are contradictory.

[0074] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0075] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements and simple improvements made to the essential contents of the present invention should be included in the scope of protection of the present invention.

Claims

1. An aluminum-air battery system for efficiently recovering reaction products, characterized in that: include: An ion membrane electrolysis compartment (1), a cyclone (2) and a battery stack (3), wherein an ion membrane (11) is provided in the ion membrane electrolysis compartment (1), the ion membrane (11) divides the ion membrane electrolysis compartment (1) into a cathode chamber (5) and an anode chamber (6), a cathode plate (12) is provided in the cathode chamber (5), an anode plate (13) is provided in the anode chamber (6), the ion membrane electrolysis compartment (1) is connected to the inlet of the cyclone (2) through a pipeline, a circulation pump (7) is provided on the pipeline between the ion membrane electrolysis compartment (1) and the cyclone (2), the top overflow port of the cyclone (2) is connected to the battery stack (3) through a pipeline, and the battery stack (3) is respectively connected to the cathode chamber (5) and the anode chamber (6) of the ion membrane electrolysis compartment (1) through pipelines; Ion membrane electrolysis technology is used to convert the main product of aluminum-air battery reaction, sodium tetrahydroxyaluminate, into aluminum hydroxide. The ion membrane is Nafion membrane, and the internal structure of Nafion membrane is R-SO3-H + (Na + ), wherein R represents a polymer structure, the solution in the cathode chamber is a NaOH solution, and the solution in the anode chamber is a sodium tetrahydroxyaluminate solution; The cathode chamber (5) and the anode chamber (6) are connected via a connecting pipe, and a first solenoid valve (14) is provided on the connecting pipe. The pipes between the battery stack (3) and the ion membrane electrolysis compartment (1) include a first pipe (15), a tee pipe (16), a second pipe (17) and a third pipe (18). The first end of the first pipe (15) is connected to the battery stack (3), the second end of the first pipe (15) is connected to the tee pipe (16), and the other two ends of the tee pipe (16) are respectively connected to the second pipe (17) and the third pipe (18). The second pipe (17) is connected to the anode chamber (6), and the third pipe (18) is connected to the cathode chamber (5). A second solenoid valve (19) is provided on the third pipe (18). The first solenoid valve (14) and the second solenoid valve (19) are both normally-off solenoid valves. The first solenoid valve (14) and the second solenoid valve (19) are normally-off solenoid valves. When the first solenoid valve (14) and the second solenoid valve (19) are powered on and off at the same time, when the first solenoid valve (14) and the second solenoid valve (19) are powered off, the cathode chamber (5) and the anode chamber (6) are not connected, and the electrolyte from the battery stack (3) only flows into the anode chamber (6); when the first solenoid valve (14) and the second solenoid valve (19) are powered on at the same time, the cathode chamber (5) and the anode chamber (6) are connected, and part of the electrolyte flows into the cathode chamber (5) through the three-way pipe (16), and part of the electrolyte flows into the anode chamber (6) through the three-way pipe (16). The electrolyte entering the cathode chamber (5) is mixed with the electrolyte formed by ion membrane electrolysis in the cathode chamber (5), and then flows into the anode chamber (6) through the connecting pipe and the first electromagnetic valve (14). In the anode chamber (6), the electrolyte from the cathode chamber (5) is mixed with the electrolyte in the anode chamber (6). After mixing, the electrolyte is driven by the circulation pump (7) to form a circulation; the first electromagnetic valve (14) and the second electromagnetic valve (19) are intermittently energized or de-energized at the same time, thereby realizing intermittent circulation of the electrolyte in the cathode chamber (5).

2. The aluminum-air battery system for efficiently recovering reaction products according to claim 1, characterized in that: A radiator (4) is provided on the pipeline between the battery stack (3) and the ion membrane electrolysis compartment (1), and a plurality of cooling fans (41) are provided below the radiator (4).

3. The aluminum-air battery system for efficiently recovering reaction products according to claim 1, characterized in that: A filtering and recovering device is provided below the cyclone (2), and the filtering and recovering device is provided above the anode chamber (6).

4. The aluminum-air battery system for efficiently recovering reaction products according to claim 3, characterized in that: The filtration recovery device comprises an L-shaped filter layer (8), the L-shaped filter layer (8) is fixed on the side wall of the ion membrane electrolysis chamber (1), and the L-shaped filter layer (8) and the side wall of the ion membrane electrolysis chamber (1) form a filter tank.

5. The aluminum-air battery system for efficiently recovering reaction products according to claim 4, characterized in that: A reactant collecting net (9) is detachably connected to the filter tank formed by the L-shaped filter layer (8) and the side wall of the ion membrane electrolysis chamber (1).

6. The aluminum-air battery system for efficiently recovering reaction products according to claim 4 or 5, characterized in that: The bottom and side of the L-shaped filter layer (8) are both provided with filter holes, the pore diameters of the filter holes at the bottom of the L-shaped filter layer (8) are the same, and the pore diameters of the filter holes at the side of the L-shaped filter layer (8) gradually increase from bottom to top.

7. The aluminum-air battery system for efficiently recovering reaction products according to claim 1, characterized in that: A cover plate (10) is provided above the ion membrane electrolysis chamber (1), and the cover plate (10) is used to fix the cathode plate (12), the ion membrane (11) and the anode plate (13). A negative electrode tab (101) and a positive electrode tab (102) are provided on the cover plate (10).

8. The aluminum-air battery system for efficiently recovering reaction products according to claim 7, characterized in that: The cover plate (10) is provided with a plurality of oxygen exhaust holes (103) and a plurality of hydrogen exhaust holes (104).

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