Aluminum air battery electrolyte circulating filtration device with efficient heat dissipation and automatic backwashing functions

Abstract

The invention discloses an aluminum air battery electrolyte circulating filtration device with efficient heat dissipation and automatic backwashing functions. The device is composed of a device outer shell, a filtration unit, a water flow meter, an inlet switch valve, a drain outlet switch valve and the like. According to the device, the filter unit is matched with the electrolyte inlet of the device outer shell to realize backwashing of the filter screen, and the filter unit is matched with the electrolyte outlet of the device outer shell to realize electrolyte filtration; the flow change of the water flowmeter at the outlet of the device shell determines when to discharge filtered Al (OH) 3 precipitate from the electrolyte from the drain outlet of the device shell, so as to prevent the filter screen from being blocked to reduce the filtering function. Heat dissipation is carried out through cooling fins and heat pipes at the bottom of the device outer shell. The device is compact in structure and high in safety, can dissipate heat of the circulating electrolyte, and can effectively filter and discharge Al (OH) 3 generated by the electrolyte in the discharge process of the aluminum air battery.

Description

Technical Field

[0001] The present invention relates to a technology in the field of aluminum-air batteries, and specifically to a device for circulating filtration, backwashing and heat dissipation for aluminum-air battery electrolyte. Background Art

[0002] Aluminum has low density and light weight. The average content of aluminum resources in the earth's crust is 8.7%, ranking first among the metal elements in the earth's crust. In addition, it can transfer three electrons in the electrochemical process and has a high theoretical specific energy (8100Wh·kg -1 ) and specific capacity (2980Ah·kg -1 ). Aluminum-air battery is one of the most promising advanced clean energy conversion and storage technologies. Aluminum-air battery is mainly composed of three parts: aluminum anode, electrolyte and air electrode. The aluminum anode is mainly high-purity aluminum (containing 99.99% aluminum) or aluminum micro-alloyed alloy, and the electrolyte is mainly neutral solution sodium chloride or alkaline solution sodium hydroxide. Aluminum-air battery does not produce toxic and harmful substances during operation, and is light in weight, low in noise, strong in adaptability and stable in performance.

[0003] Aluminum-air batteries generate a large amount of aluminum hydroxide during the discharge process. These discharge products accumulate on the electrode surface and inside the battery, causing many adverse effects on the battery. The main effects include the following: (1) The discharge products adhere to the electrolyte, hindering the discharge process of the aluminum negative electrode, increasing the internal resistance of the battery, and thus reducing the performance of the entire battery; (2) A large amount of discharge products accumulate inside the battery. If they are not discharged in time, it will cause difficulties in cleaning and maintenance of the battery, thereby shortening the service life of the battery; (3) The production of aluminum hydroxide consumes a large amount of water, increasing the battery's demand for water and reducing the specific energy; (4) On the aluminum electrode, a large amount of aluminum hydroxide particles will cause the passivation of the aluminum negative electrode and reduce its performance; (5) The discharge product aluminum hydroxide will destroy the catalyst layer and diffusion layer of the air electrode, resulting in a decrease in the performance and life of the air electrode.

[0004] The methods currently used include: (1) timely replacement of electrolyte; (2) adding separation devices such as settlers and cyclones to separate discharge products; (3) adding flocculants or seed crystals to allow discharge products to settle in time, but all of these methods are costly and increase the weight, making them inconvenient. Summary of the invention

[0005] The purpose of the present invention is to solve the above problems and to provide an aluminum-air battery electrolyte circulation filtering device with high efficiency heat dissipation and automatic backwashing.

[0006] The purpose of this section is to summarize some aspects of the embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the abstract and title of the invention of this application to avoid blurring the purpose of this section, the abstract and the title of the invention, and such simplifications or omissions shall not be used to limit the scope of the present invention.

[0007] The present invention provides an aluminum-air battery electrolyte circulation filtration device with high-efficiency heat dissipation and automatic backwashing, comprising a device outer shell, a water flow meter, a sewage outlet switch valve, an inlet switch valve, and a filter unit, wherein the device outer shell and the filter unit constitute the device body, the filter unit is located inside the device outer shell, the device water flow meter is arranged at the liquid outlet position of the device outer shell, so as to monitor the electrolyte flow; the sewage outlet switch valve is arranged at the sewage outlet position of the device outer shell, so as to remove aluminum hydroxide precipitation at any time; the inlet switch valve is arranged at the liquid inlet position of the device outer shell, so as to control the electrolyte entering the device.

[0008] Preferably, the device outer shell includes an upper cover of the device outer shell, a liquid inlet, a limit block 1, a heat sink, a heat pipe, a sewage outlet, a lower box of the device outer shell, a limit block 2, and a liquid outlet, wherein the limit block 1 and the limit block 2 are arranged in parallel, and the limit block 1 and the limit block 2 are connected to the inner wall of the lower box of the device outer shell by welding. The limit block ensures that the liquid exchange port of the filter unit is aligned with the liquid inlet and the liquid outlet of the device outer shell. The heat sink is connected to the lower box of the outer shell by welding and is located below the lower box of the device outer shell. The heat pipe is distributed in a ring shape around the heat sink. The heat sink and the heat pipe can ensure the cooling of the electrolyte and the precipitation of aluminum hydroxide in the electrolyte.

[0009] Preferably, the filter unit comprises a filter unit outer shell, a rolling bearing, a liquid exchange port, a sealing ring, a stainless steel multi-layer filter screen, and waterproof self-tapping screws, wherein a handle for easy rotation is provided on the upper part of the filter unit outer shell, and the sealing ring and the stainless steel multi-layer filter screen are arranged at the bottom of the filter unit outer shell by waterproof self-tapping screws.

[0010] Preferably, a stepped through hole is provided at the center of the upper cover of the device outer shell to facilitate the assembly of the filter unit and the device outer shell and the placement of the rolling bearing.

[0011] Preferably, the liquid inlet and outlet are arranged as convex circles on one side close to the inner wall of the lower box body of the device outer shell, and the liquid exchange port is arranged as a concave circle, and the two cooperate with each other to ensure sealing.

[0012] Preferably, the filtration accuracy of the stainless steel multi-layer filter (55) is 2-5 μm.

[0013] In general, the device is simple in design and easy to maintain. It can not only effectively achieve the goal of separating reaction products, but also significantly reduce the volume and weight of the entire aluminum-air battery system. The device also uses a backwashing process without the need to disassemble or suspend the power generation of the aluminum-air battery. On the one hand, it can extend the service life of the filter, and on the other hand, it can ensure the continuous discharge of the aluminum-air battery, bringing significant benefits to practical applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. The detailed description of non-limiting embodiments made by referring to the following drawings is used to explain the present invention together with the embodiments of the present invention. In the drawings: Figure 1 It is a schematic diagram of the overall structure of the device of the present invention; Figure 2 is a schematic cross-sectional view of the outer shell of the device in the device of the present invention; Figure 3 It is a main diagram of the outer shell of the device in the device of the present invention; Figure 4 is a top view of the outer shell of the device in the device of the present invention; Figure 5 is a main diagram of a filter unit in the device of the present invention; Figure 6 is a cross-sectional schematic diagram of a filter unit in the device of the present invention; Figure 7 It is a schematic diagram of the filtering operation of the device of the present invention; Figure 8 It is a schematic diagram of the backwashing operation of the device of the present invention; Among them, the figure markings are: 1-device outer shell; 2-water flow meter; 3-drainage outlet switch valve; 4-inlet switch valve; 5-filter unit; 11-device outer shell upper cover; 12-liquid inlet; 13-limiting block 1; 14-heat sink; 15-heat pipe; 16-drainage outlet; 17-device outer shell lower box; 18-limiting block 2; 19-liquid outlet; 51-filter unit outer shell; 52-rolling bearing; 53-liquid exchange port; 54-sealing ring; 55-stainless steel multi-layer filter; 56-waterproof self-tapping screw. DETAILED DESCRIPTION

[0015] The present invention is described in detail below in conjunction with embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those of ordinary skill in the art, some adjustments and improvements can also be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0016] Aluminum-air battery electrolyte circulation filtration device with high efficiency heat dissipation and automatic backwashing ( Figure 1 ), comprising: an outer shell of the device (1), a water flow meter (2), a sewage outlet switch valve (3), an inlet switch valve (4), and a filter unit (5), wherein the outer shell of the device ( Figure 2 ) comprises an upper cover (11) of the device outer shell, a liquid inlet (12), a stopper 1 (13), a heat sink (14), a heat pipe (15), a sewage outlet (16), a lower box body (17) of the device outer shell, a stopper 2 (18), and a liquid outlet (19), wherein the filtering unit ( Figure 5 ) comprises a filter unit outer shell (51), a rolling bearing (52), a liquid exchange port (53), a sealing ring (54), a stainless steel multi-layer filter screen (55), and waterproof self-tapping screws (56).

[0017] Filtration working method of aluminum-air battery electrolyte circulation filtration device with high efficiency heat dissipation and automatic backwashing ( Figure 7 ): Close the drain outlet switch valve (3), position the liquid exchange port (53) of the filter unit (5) through the limit block 2 (18), rotate it to align with the liquid outlet (19) of the device shell, and open the inlet switch valve (4). At this time, the electrolyte enters the device shell (1) through the liquid inlet (12) of the device shell. Since the bottom drain outlet switch valve (3) has been closed, the electrolyte begins to accumulate at the bottom of the device shell (1). At this time, the electrolyte is dissipated and cooled through the heat sink (14) and the heat pipe (15). The lowering of the electrolyte temperature facilitates the precipitation of aluminum hydroxide from the electrolyte. As the electrolyte level increases, after being filtered by the stainless steel multi-layer filter (55), it reaches the height position of the liquid exchange port (53) of the filter unit (5), and then the filtered electrolyte is discharged from the liquid outlet (19) of the device shell, thereby filtering the electrolyte.

[0018] Backwashing working method of aluminum-air battery electrolyte circulation filtration device with high efficiency heat dissipation and automatic backwashing ( Figure 8 ): After observing that the flow reading of the water flow meter (2) has dropped significantly, close the inlet switch valve (4), position the liquid exchange port (53) of the filter unit (5) through the limit block 1 (13), rotate it to align with the liquid inlet (12) of the device outer shell, open the bottom sewage outlet switch valve (3), and then open the inlet switch valve (4) to allow clean water to discharge the aluminum hydroxide on the stainless steel multi-layer filter screen (55) and the bottom of the device outer shell (1), so as to achieve the effect of backwashing the device.

Claims

1. An aluminum-air battery electrolyte circulation filtration device with high efficiency heat dissipation and automatic backwashing, characterized in that: The device comprises an outer shell (1), a water flow meter (2), a sewage outlet switch valve (3), an inlet switch valve (4), and a filter unit (5), wherein the outer shell (1) and the filter unit (5) constitute a main body of the device, the filter unit (5) is located inside the outer shell (1), the water flow meter (2) is arranged at the liquid outlet position of the outer shell (1), the sewage outlet switch valve (3) is arranged at the sewage outlet position of the outer shell (1), and the inlet switch valve (4) is arranged at the liquid inlet position of the outer shell (1).

2. The aluminum-air battery electrolyte circulation filtration device with high efficiency heat dissipation and automatic backwashing according to claim 1 is characterized in that The device outer shell (1) comprises an upper cover (11) of the device outer shell, a liquid inlet (12), a stopper block 1 (13), a heat sink (14), a heat pipe (15), a sewage outlet (16), a lower box (17) of the device outer shell, a stopper block 2 (18), and a liquid outlet (19), wherein the stopper block 1 (13) and the stopper block 2 (18) are arranged in parallel, the stopper block 1 (13) and the stopper block 2 (18) are connected to the inner wall of the lower box (17) of the device outer shell by welding, the heat sink (14) is connected to the lower box (17) of the device outer shell by welding, and is located below the lower box (17) of the device outer shell, and the heat pipe (15) is distributed in a ring shape around the heat sink (14).

3. The aluminum-air battery electrolyte circulation filtration device with high efficiency heat dissipation and automatic backwashing according to claim 1 is characterized in that The filter unit (5) comprises a filter unit outer shell (51), a rolling bearing (52), a liquid exchange port (53), a sealing ring (54), a stainless steel multi-layer filter screen (55), and a waterproof self-tapping screw (56), wherein a handle for easy rotation is arranged on the upper part of the filter unit outer shell (51), and the sealing ring (54) and the stainless steel multi-layer filter screen (55) are arranged on the bottom of the filter unit outer shell (51) through the waterproof self-tapping screw (56).

4. The aluminum-air battery electrolyte circulation filtration device with high efficiency heat dissipation and automatic backwashing according to claim 2 is characterized in that A stepped through hole is arranged at the center of the upper cover (11) of the device outer shell.

5. The aluminum-air battery electrolyte circulation filtration device with high efficiency heat dissipation and automatic backwashing according to claim 2 is characterized in that The liquid inlet (12) and the liquid outlet (19) are arranged in a convex circular shape on one side close to the inner wall of the lower box body (17) of the device outer shell.

6. The aluminum-air battery electrolyte circulation filtration device with high efficiency heat dissipation and automatic backwashing according to claim 2 is characterized in that The bottom of the lower box body (17) of the device outer shell is set to be conical.

7. The aluminum-air battery electrolyte circulation filtration device with high efficiency heat dissipation and automatic backwashing according to claim 3 is characterized in that The liquid replacement port (53) is configured as a concave circular shape.

8. The aluminum-air battery electrolyte circulation filtration device with high efficiency heat dissipation and automatic backwashing according to claim 3 is characterized in that The filtration accuracy of the stainless steel multi-layer filter (55) is 2-5 μm.

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