Aluminum air battery

Abstract

The utility model discloses an aluminum air battery which comprises a shell, a battery positive plate and a battery negative plate, an electrolyte filling cavity is formed in the shell, and the electrolyte filling cavity is filled with electrolyte; the battery positive plate and the battery negative plate are located at the two ends of the electrolyte filling cavity respectively, the battery positive plate comprises a metal net and an activated carbon coating coated on the metal net, the metal net comprises a plurality of metal strips distributed in a net shape, a plurality of arc-shaped protrusions are arranged on the surfaces of the metal strips, and the battery negative plate is an aluminum sheet. According to the aluminum air battery, the plurality of arc-shaped bulges arranged on the surface of the metal strip can increase the surface area of the activated carbon coating coated on the metal net on the premise of not increasing the length and the width of the positive plate of the battery, and the structure of the arc-shaped bulges can be used for conveniently coating the activated carbon coating on the metal net without easily causing the breakage of the activated carbon coating, so that the service life of the battery is prolonged. Therefore, more oxygen can be absorbed, and a chemical reaction is carried out under the catalytic action of more activated carbon, so that more electric energy can be generated more quickly.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to an aluminum-air battery. Background Art

[0002] Aluminum-air battery is a chemical battery with high-purity aluminum sheet as the negative electrode, oxygen as the positive electrode, and alkaline aqueous solution such as potassium hydroxide solution or sodium hydroxide solution as the electrolyte. It is a promising air battery. Some aluminum-air batteries in the prior art have a positive electrode including a catalyst layer, a current collector, and a waterproof and breathable layer. The three-layer structure is laminated to form a positive electrode. However, the size of the positive electrode is limited by the external dimensions of the aluminum-air battery and the internal filling space. Therefore, it is difficult to improve the overall performance of the battery without increasing the external dimensions and internal filling space of the aluminum-air battery. Utility Model Content

[0003] In order to overcome the deficiencies of the prior art, the purpose of the utility model is to provide an aluminum-air battery that can absorb more oxygen and undergo chemical reactions under the action of more catalysts, thereby generating more electrical energy faster and improving the overall performance of the battery.

[0004] In order to solve the above problems, the technical solution adopted by the utility model is as follows: an aluminum-air battery, comprising a shell, a battery positive electrode sheet and a battery negative electrode sheet; an electrolyte filling cavity is opened inside the shell, and the electrolyte filling cavity is filled with electrolyte; the battery positive electrode sheet and the battery negative electrode sheet are respectively located at the two ends of the electrolyte filling cavity, the battery positive electrode sheet comprises a metal mesh and an activated carbon coating coated on the metal mesh, the metal mesh comprises a plurality of metal bars distributed in a mesh shape, the surface of the metal bars has a plurality of arc-shaped protrusions, and the surfaces of all the arc-shaped protrusions are coated with the activated carbon coating, and the battery negative electrode sheet is an aluminum sheet.

[0005] Compared with the prior art, the beneficial effect of the utility model is that the aluminum-air battery uses an aluminum sheet as the negative electrode of the battery, and uses an activated carbon coating coated on a metal mesh as the positive electrode of the battery. The porous structure of the activated carbon itself and its own reaction activity can be used to allow the positive electrode of the battery to absorb oxygen in the air as the positive electrode of the battery, and the oxygen reacts chemically with the aluminum sheet under the action of the activated carbon and the electrolyte, thereby generating electrical energy. The multiple arc-shaped protrusions arranged on the surface of the metal strip can increase the surface area of ​​the activated carbon coating coated on the metal mesh without increasing the length and width of the positive electrode of the battery, thereby absorbing more oxygen and reacting chemically under the catalytic action of more activated carbon, thereby generating more electrical energy faster. The structure of the arc-shaped protrusion can facilitate the full coating of the activated carbon coating on the metal mesh, and it is not easy to cause the activated carbon coating to rupture, so that there will be no leakage, and it can ensure the absorption and reaction of oxygen, thereby improving the overall performance of the battery.

[0006] In the aluminum-air battery mentioned above, the arc-shaped protrusion is transitionally connected to the surface of the metal strip.

[0007] In the aluminum-air battery mentioned above, the shell is also provided with an air passage, and the negative electrode sheet of the battery is closer to the air passage than the positive electrode sheet of the battery.

[0008] In the aluminum-air battery mentioned above, the shell is also provided with an electrolyte inlet and outlet channel, and the electrolyte inlet and outlet channel is connected to the electrolyte filling cavity.

[0009] The above-mentioned aluminum-air battery, the shell includes a first clip, a second clip and a third clip connected in sequence, the battery positive electrode sheet is clamped between the first clip and the second clip, and the battery negative electrode sheet is clamped between the second clip and the third clip.

[0010] In the above-mentioned aluminum-air battery, a first mounting groove is provided between the first clip and the second clip, the battery positive electrode sheet is placed in the first mounting groove, and a first sealing ring is sleeved on the outer circumference of the battery positive electrode sheet, and the first sealing ring seals and connects the first mounting groove, the first clip and the second clip; a second mounting groove is provided between the second clip and the third clip, the battery negative electrode sheet is placed in the second mounting groove, and a second sealing ring is sleeved on the outer circumference of the battery negative electrode sheet, and the second sealing ring seals and connects the second mounting groove, the second clip and the third clip.

[0011] In the above-mentioned aluminum-air battery, the first clamp, the second clamp and the third clamp are connected in sequence by bolts.

[0012] In the above-mentioned aluminum-air battery, the electrolyte is an alkaline solution containing additives.

[0013] In the above-mentioned aluminum-air battery, the surface of the aluminum sheet has a passivation layer.

[0014] The utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the overall structure of an aluminum-air battery according to an embodiment of the utility model;

[0016] Figure 2 for Figure 1 a cross-sectional view of the structure shown;

[0017] Figure 3 This is a schematic diagram of the structure of the metal mesh of an embodiment of the utility model;

[0018] Figure 4It is a schematic structural diagram of a metal strip according to an embodiment of the utility model.

[0019] Description of the accompanying drawings: 100 shell, 110 electrolyte filling cavity, 120 air channel, 130 electrolyte inlet and outlet channel, 131 plug, 140 first clip, 150 second clip, 160 third clip, 170 first mounting groove, 180 second mounting groove, 200 battery positive electrode sheet, 210 metal mesh, 211 metal strip, 212 arc-shaped protrusion, 300 battery negative electrode sheet, 400 first sealing ring, 500 second sealing ring, 600 bolt. DETAILED DESCRIPTION

[0020] The embodiments of the present invention are described in detail below. Figures 1 to 4 An embodiment of the utility model provides an aluminum-air battery, comprising a shell 100, a battery positive electrode sheet 200 and a battery negative electrode sheet 300; an electrolyte filling cavity 110 is opened inside the shell 100, and the electrolyte filling cavity 110 is filled with electrolyte; the battery positive electrode sheet 200 and the battery negative electrode sheet 300 are respectively located at the two ends of the electrolyte filling cavity 110, the battery positive electrode sheet 200 comprises a metal mesh 210 and an activated carbon coating coated on the metal mesh 210, the metal mesh 210 comprises a plurality of metal strips 211 distributed in a mesh shape, the surface of the metal strips 211 has a plurality of arc-shaped protrusions 212, and the surfaces of all the arc-shaped protrusions 212 are coated with the activated carbon coating, and the battery negative electrode sheet 300 is an aluminum sheet.

[0021] As can be seen from the above structural description, the aluminum-air battery uses an aluminum sheet as the battery negative electrode sheet 300, and uses an activated carbon coating coated on a metal mesh 210 as the battery positive electrode sheet 200. The porous structure of the activated carbon itself and its own reaction activity can be used to allow the battery positive electrode sheet 200 to absorb oxygen in the air as the battery positive electrode, and the oxygen reacts chemically with the aluminum sheet under the action of the activated carbon and the electrolyte, thereby generating electrical energy. The multiple arc-shaped protrusions 212 arranged on the surface of the metal strip 211 can increase the surface area of ​​the activated carbon coating coated on the metal mesh 210 without increasing the length and width of the battery positive electrode sheet 200, thereby absorbing more oxygen and reacting chemically under the catalytic action of more activated carbon, thereby generating more electrical energy faster. The structure of the arc-shaped protrusion 212 can facilitate the coating of the activated carbon coating on the metal mesh 210, so that the activated carbon coating can better fit the surface of the metal strip 211 and the surface of the arc-shaped protrusion 212, and it is not easy to cause the activated carbon coating to break, so there will be no leakage, and it can ensure the absorption and reaction of oxygen, thereby improving the overall performance of the battery.

[0022] Furthermore, the metal mesh 210 may be a stainless steel mesh or the like, and the arc-shaped protrusion 212 may be formed by plasma impact, mechanical stamping or later welding. Figure 4As shown, the arc-shaped protrusion 212 is transitionally connected to the surface of the metal strip 211, so that the arc-shaped protrusion 212 and the surface of the metal strip 211 transition more naturally and smoothly, so that the activated carbon coating coated on the metal mesh 210 can better fit the surface of the metal mesh 210, avoiding warping or cracking.

[0023] Furthermore, the surface of the aluminum sheet has a passivation layer, and a passivation layer can be formed on the surface of the aluminum sheet by chelating agent passivation treatment, thereby effectively enhancing the corrosion resistance of the aluminum sheet, so that it can work stably in the electrolyte, and the overall service life of the battery is improved. The activated carbon coating can be obtained by the following method: polyvinylidene fluoride is used as a binder and dissolved in nmp, and then activated carbon is added, and a slurry is formed after stirring, and then the slurry is coated on the metal mesh 210. Specifically, the slurry can be coated on the metal mesh 210 with a battery coating scraper, and the battery positive electrode is obtained after drying. Furthermore, the electrolyte is an alkaline solution containing additives, such as a sodium hydroxide solution containing sodium carboxymethyl cellulose. During the operation of the battery, the additive will adhere to the aluminum sheet, thereby forming a protective layer on the surface of the aluminum sheet, enhancing the corrosion resistance of the aluminum sheet.

[0024] Further, refer to Figure 2 The housing 100 is also provided with an air channel 120. The battery negative electrode sheet 300 is closer to the air channel 120 than the battery positive electrode sheet 200, so that the battery positive electrode sheet 200 can be installed at the bottom of the electrolyte filling cavity 110, further improving the anti-leakage effect. It can be understood that a waterproof and breathable layer is provided on the side of the battery negative electrode sheet 300 close to the air channel 120, so that the external air can enter the electrolyte filling cavity 110 through the air channel 120, and the internal electrolyte will not seep out. Further, the housing 100 is also provided with an electrolyte inlet and outlet channel 130, and the electrolyte inlet and outlet channel 130 is connected to the electrolyte filling cavity 110 to facilitate the addition or pouring of electrolyte. For the structure that can add or pour electrolyte, a plug 131 is provided at the inlet and outlet of the electrolyte inlet and outlet channel 130 to block the inlet and outlet of the electrolyte inlet and outlet channel 130. When the battery is used in the marine field, the inlet and outlet of the electrolyte inlet and outlet channel 130 do not need to be blocked, so that seawater can flow in and out freely.

[0025] Further, refer to Figure 1 and Figure 2The housing 100 includes a first clamp 140 , a second clamp 150 and a third clamp 160 connected in sequence, the battery positive electrode sheet 200 is clamped between the first clamp 140 and the second clamp 150 , and the battery negative electrode sheet 300 is clamped between the second clamp 150 and the third clamp 160 . Specifically, a first mounting groove 170 is provided between the first clip 140 and the second clip 150, the battery positive electrode sheet 200 is placed in the first mounting groove 170, and a first sealing ring 400 is sleeved on the outer periphery of the battery positive electrode sheet 200, and the first sealing ring 400 seals and connects the first mounting groove 170, the first clip 140 and the second clip 150; a second mounting groove 180 is provided between the second clip 150 and the third clip 160, the battery negative electrode sheet 300 is placed in the second mounting groove 180, and a second sealing ring 500 is sleeved on the outer periphery of the battery negative electrode sheet 300, and the second sealing ring 500 seals and connects the second mounting groove 180, the second clip 150 and the third clip 160. This structure facilitates the assembly and molding of the battery, and can ensure the sealing of the internal environment of the electrolyte filling cavity 110. Specifically, the first clip 140 , the second clip 150 and the third clip 160 are connected in sequence by bolts 600 to facilitate disassembly and replacement of the internal structure. At the same time, the clamping effect of the first clip 140 , the second clip 150 and the third clip 160 can be ensured by adjusting the bolts 600 .

[0026] It should be noted that in the description of the present invention, if there are any orientation descriptions, such as up, down, front, back, left, right, etc., the orientations or positional relationships indicated are all based on the orientations or positional relationships shown in the drawings. They 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 or operated in a specific orientation, and cannot be understood as a limitation on the present invention.

[0027] In the description of the present utility model, "several" means one or more, "more" means two or more, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself. If there is a description of "first" or "second", it 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 order of the indicated technical features.

[0028] 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.

[0029] The above-mentioned implementation modes are only preferred implementation modes of the present invention, and cannot be used to limit the protection scope of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.

Claims

1. An aluminum-air battery, characterized in that: It comprises a housing (100), a battery positive electrode sheet (200) and a battery negative electrode sheet (300); An electrolyte filling cavity (110) is provided inside the housing (100), and the electrolyte filling cavity (110) is filled with electrolyte; The battery positive electrode sheet (200) and the battery negative electrode sheet (300) are respectively located at two ends of the electrolyte filling cavity (110); the battery positive electrode sheet (200) comprises a metal mesh (210) and an activated carbon coating coated on the metal mesh (210); the metal mesh (210) comprises a plurality of metal strips (211) distributed in a mesh shape; the surface of the metal strips (211) has a plurality of arc-shaped protrusions (212); the surfaces of all the arc-shaped protrusions (212) are coated with the activated carbon coating; and the battery negative electrode sheet (300) is an aluminum sheet.

2. The aluminum-air battery according to claim 1, characterized in that: The arc-shaped protrusion (212) is transitionally connected to the surface of the metal strip (211).

3. The aluminum-air battery according to claim 1, characterized in that: The housing (100) is also provided with an air passage (120), and the battery negative electrode sheet (300) is closer to the air passage (120) than the battery positive electrode sheet (200).

4. The aluminum-air battery according to claim 1, characterized in that: The housing (100) is also provided with an electrolyte inlet and outlet channel (130), and the electrolyte inlet and outlet channel (130) is connected to the electrolyte filling chamber (110).

5. The aluminum-air battery according to claim 1, characterized in that: The housing (100) comprises a first clamp (140), a second clamp (150) and a third clamp (160) which are connected in sequence; the battery positive electrode sheet (200) is clamped between the first clamp (140) and the second clamp (150); and the battery negative electrode sheet (300) is clamped between the second clamp (150) and the third clamp (160).

6. The aluminum-air battery according to claim 5, characterized in that: A first mounting groove (170) is provided between the first clamping piece (140) and the second clamping piece (150), the battery positive electrode sheet (200) is placed in the first mounting groove (170), and a first sealing ring (400) is sleeved on the outer periphery of the battery positive electrode sheet (200), and the first sealing ring (400) seals and connects the first mounting groove (170), the first clamping piece (140) and the second clamping piece (150); A second mounting groove (180) is provided between the second clamp (150) and the third clamp (160), the battery negative electrode sheet (300) is placed in the second mounting groove (180), and a second sealing ring (500) is sleeved on the outer periphery of the battery negative electrode sheet (300), and the second sealing ring (500) seals and connects the second mounting groove (180), the second clamp (150) and the third clamp (160).

7. The aluminum-air battery according to claim 5, characterized in that: The first clamp (140), the second clamp (150) and the third clamp (160) are connected in sequence via bolts (600).

8. The aluminum-air battery according to claim 1, characterized in that: The electrolyte is an alkaline solution containing additives.

9. The aluminum-air battery according to claim 1, characterized in that: The surface of the aluminum sheet has a passivation layer.

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