JP6930755B2 - Magnesium fuel assembly, magnesium-air battery and magnesium-air battery connector - Google Patents

Description

The present invention relates to a magnesium fuel assembly , a magnesium-air battery and a magnesium-air battery connector .

In a magnesium air battery in which oxygen in the air is used as a positive electrode active material and magnesium is used as a negative electrode active material, a magnesium hydroxide film that does not allow electricity or ions to pass through is formed on the surface of magnesium as the reaction progresses, and the size gradually increases from the negative electrode. It becomes difficult to take out the current. In the magnesium-air battery described in Patent Document 1, magnesium is adhered on a conductive film to form a roll, and the roll-shaped film is rotated to cooperate with a positive electrode located in the vicinity thereof and unreacted one after another. The parts react and generate electricity continuously.

Further, as in Patent Document 2, the same effect can be obtained by replacing the thin plate-shaped fuel when the reaction is lowered. Patent Document 2 enables continuous introduction and withdrawal of fuel from the electrodes by installing a thin plate-shaped fuel in a separator folded in a bellows shape.

Patent No. 5598883 Patent No. 5891569

In a mechanism such as Patent Document 1 and Patent Document 2, it is necessary to efficiently draw electricity from the surface of the fuel to be replaced. Since an oxide film is formed on the surface of magnesium in a short time, it is difficult to efficiently draw electricity by point contact. In addition, if the fuel manufacturing process becomes complicated, the fuel price will rise and the production amount will decrease.

The present invention was conceived in view of the above, the magnesium fuel body that suppresses a decrease in current due to oxide film formed on the negative electrode by a simple structure, the magnesium-air battery having a magnesium fuel of its, And a magnesium air battery connector comprising the magnesium air battery .

In order to achieve the above object, the magnesium fuel assembly according to the first aspect of the present invention is
A thin plate of metallic magnesium with a thickness of 1 mm or less with an incision,
A conductive member that extracts electricity by contact with an external electrode,
With
The conductive member is inserted into the incision portion and protrudes from the back surface of the thin plate, and the incision surface of the incision portion and the conductive member are brought into close contact with each other to conduct conduction with almost no resistance due to the oxide film, and the conductive member. The protruding portion of the thin plate is brought into close contact with the back surface of the thin plate .
It is characterized by that.

The magnesium fuel body is characterized in that the incision portion is a notch in the thin plate and the conductive member is a conductive plate.

The incision is perforation of the thin, the Ri conductive member is conductive pillars der, after inserting the conductive posts to the perforation, by compressing the ends of the major axis of the conductive pillar, the perforations It is characterized in that the inner wall is brought into close contact with the conductive column without a gap.

The magnesium-air battery according to the second aspect of the present invention is
The magnesium fuel body according to the first aspect of the present invention and
With electrolyte
An electrolyte solution holding material formed by capable impregnating material to the electrolyte,
A cathode that sandwiches the electrolyte holding material from both sides,
An electrolytic solution tank installed below the magnesium fuel assembly and storing the electrolytic solution,
With
The electrolyte solution holding member by wrapping crowded said magnesium fuel body, have been inserted between two of said cathode,
The cathode is not immersed in the electrolytic solution, the electrolytic solution holding material is immersed in the electrolytic solution, and the electrolytic solution holding material is impregnated with the electrolytic solution, whereby the battery reaction is started.
It is characterized by that.

In addition, the magnesium-air battery is
The magnesium fuel body may be installed at an angle with respect to the water surface of the electrolytic solution.

The magnesium-air battery may include a connection terminal including two grooves for supporting the cathode and a circular tube portion for connecting a conducting wire electrically connected to the outside.

The magnesium-air battery connector of the present invention
Equipped with a plurality of the magnesium-air batteries
Each is connected in series,
The cathode is not immersed in the electrolytic solution, and the electrolytic solution holding portion and the magnesium fuel body are immersed in the electrolytic solution.
A plurality of the magnesium-air batteries connected in series share one of the electrolyte tanks.

Further, the magnesium-air battery connector may be provided with a frame-shaped or girder-shaped spacer in the vicinity of the cathode, which forms a gap between the adjacent cathodes to take in air necessary for the battery reaction.

The magnesium-air battery connector
Wherein in the vicinity of the electrolyte solution holding member, the inner wall comprises a film impervious to water may breathable, the vent to capture or One air may be housed in a container with the outer wall.

According to the present invention, magnesium configured magnesium fuel body that suppresses a decrease in current due to oxide film, a magnesium-air battery comprises a magnesium fuel of its, and a plurality of the magnesium-air battery, which is formed on the negative electrode by a simple structure An air battery connector can be provided.

It is a side view which shows the schematic structure of the magnesium fuel body 100. It is a top view which shows the schematic structure which looked at the magnesium fuel body 100 from the top. It is a side sectional view which shows the schematic structure of the magnesium-air battery 200. It is a perspective view (a) and a side view (b) which show an example of a connection terminal 205. It is a perspective view which shows the schematic structure of the magnesium-air battery 200. It is an experimental result which recorded the change of the current [A] and the electric capacity [Wh] in the form (Case 1, 2, 3) of three fuel bodies. It is a perspective view (a) and a side sectional view (b) which show the schematic structure of the magnesium-air battery connection body 300. It is a top view which shows the schematic structure which saw the magnesium-air battery connection body 300 from the top. It is a perspective view which shows the schematic structure of the container 303. It is a side sectional view of a part of the wall surface of the container 303. It is a side sectional view which shows a part of the magnesium-air battery of this invention. It is a perspective schematic view which shows the structure of the magnesium fuel body 100 of Embodiment 3. It is sectional drawing of the magnesium fuel body 100 of Embodiment 3. FIG. It is sectional drawing of the magnesium fuel body 100 of Embodiment 3. FIG.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

(Embodiment 1)
1A and 1B are side views showing a schematic configuration of a magnesium fuel assembly according to a first aspect of the present invention. The magnesium fuel body 100 is composed of a magnesium thin plate 101 and a conduction plate 103, and functions as a fuel for a magnesium-air battery.

As shown in FIG. 1A, the magnesium thin plate 101 is a thin plate of metallic magnesium provided with a notch 102. Although there are two notches 102 in FIG. 1, a plurality of notches 102 may be provided. This will be described later.

The conductive plate 103 is made of a conductive material, has a plate-like shape, and takes out electricity when an external electrode comes into contact with the conductive plate 103. The conductive plate 103 is formed of, for example, a copper plate. As shown in FIG. 1A, the conduction plate 103 is inserted into the notch 102 and bent according to the notch 102, and as shown in FIG. 1B, the magnesium thin plate 101 and the conduction plate 103 are inside the notch 102. Crimping so that they are in close contact. At this time, the conduction plate 103 can be used as a contact electrode from the outside by firmly applying pressure from above or from the left and right to firmly contact the inside of the notch 102 of the magnesium thin plate 101 with the bent portion of the conduction plate 103 without a gap. Conducts with almost no resistance due to the oxide film. FIG. 2 is a plan view of this as viewed from above.

In this way, the magnesium fuel body 100 inserts the conduction plate 103 into the notch 102 and strongly crimps the magnesium fuel body 100, brings the external electrode into contact with the conduction plate 103, and conducts the contact electrode with almost no resistance due to the oxide film.

Next, a magnesium-air battery 200 that uses the magnesium fuel body 100 as fuel will be described.

The magnesium air battery 200 includes an electrolytic solution holding material 201, a cathode 202, an electrolytic solution 203, an electrolytic solution tank 204, and a connection terminal 205, and generates an electromotive force using the magnesium fuel body 100 as fuel.

FIG. 3 is a side sectional view showing a schematic configuration of the magnesium-air battery 200. (However, the connection terminal 205 is omitted.) The electrolytic solution holding material 201 is formed of a material having high water absorption that holds the liquid. The electrolytic solution holding material 201 holds the electrolytic solution 203 with water. At the same time, the cathode 202 is protected by retaining the reaction product (such as magnesium hydroxide) formed after the battery reaction inside. Examples of the material for forming the electrolytic solution holding material 201 include, but are not limited to, felt, non-woven fabric, carbon felt, gel, and the like. The electrolytic solution holding material 201 wraps the magnesium fuel body 100 with the conduction plate 103 exposed.

The electrolytic solution 203 is an electrolytic solution that enables ion exchange between the magnesium fuel body 100 and the cathode 202. The electrolytic solution 203 is, for example, an aqueous solution of sodium hydroxide, but is not limited to this.

The cathode 202 is formed of a conductive material and supplies electrons to oxygen in the air, which is the positive electrode active material of the magnesium-air battery 200. As the material forming the cathode 202, for example, carbon, metal, manganese compound, and a combination thereof can be considered, but the material is not limited thereto. In order to promote the reaction of reducing oxygen, it is desirable that the surface area is large and oxygen is easily adsorbed. The cathode 202 is arranged so as to sandwich the magnesium fuel body 100 from both sides.

The electrolytic solution tank 204 has a tank-like shape that holds the electrolytic solution 203 inside and supplies the electrolytic solution to the electrolytic solution holding material 201. The electrolytic solution is automatically supplied by the water absorption of the electrolytic solution holding material 201. Inside the electrolytic solution tank 204, the electrolytic solution 203 is held below the electrolytic solution holding material 201.

Next, the connection terminal 205 will be described. The connection terminal 205 is formed of a conductive material, supports the two cathodes 202 while connecting them, and makes an electrical connection with the outside. As an example of the shape of the connection terminal 205, the perspective view (a) and the side view (b) of FIG. 4 can be considered. The connection terminal 205 of FIG. 4 is provided with a circular tube portion 205a at the upper portion and two grooves 205b at the lower portion. A conducting wire is inserted into the circular tube portion 205a and crimped and fixed from the surroundings, and the conducting wire is electrically connected to the outside. The use of conductors to connect to the outside is to ensure flexibility, which will be described later. A cathode 202 is sandwiched in the lower groove 205b, and this is also crimp-fixed. As a material for forming the connection terminal 205, a soft and highly conductive metal such as tin can be considered.

Next, a method of using the magnesium fuel body 100 as the fuel of the magnesium-air battery 200 will be described with reference to FIG. FIG. 5 is a perspective view showing a part of the elements constituting the magnesium-air battery 200 in an exploded manner.

The magnesium fuel body 100 wrapped by the electrolytic solution holding material 201 leaving the conduction plate 103 is inserted between the two cathodes 202 supported by the connection terminal 205. The electrolytic solution holding material 201 and the magnesium fuel body 100 are immersed in the electrolytic solution 203 in the electrolytic solution tank 204 installed below. On the other hand, the cathode 202 does not come into contact with the electrolytic solution 203. The electrolytic solution holding material 201 impregnates the electrolytic solution 203, and the electrolytic solution is slowly and automatically and continuously supplied by the capillary phenomenon. At this time, the electrolytic solution holding material 201 functions as a separator, and by performing ion exchange with the impregnated electrolytic solution 203, oxygen in the air is used as the positive electrode active material, and magnesium contained in the magnesium fuel body 100 is used as the negative electrode active material. An oxidation-reduction reaction with a substance occurs to generate an electromotive force. Electricity is taken out by a lead wire crimped to the connection terminal 205 and an electrode connected to a conduction plate 103 provided in the magnesium fuel body 100. Since the magnesium fuel body 100 has a structure that can be easily attached to and detached from the magnesium-air battery 200, the fuel can be exchanged without a decrease in current due to the oxide film formed on the negative electrode.

Here, the effect of the magnesium fuel body 100 of the present embodiment is shown by the experimental results. FIG. 6 records the change in the current [A] and the electric capacity [Wh] with respect to the passage of time [minutes] when the constant voltage of 1 [V] is set in the three fuel bodies (Case 1, 2, 3). The experimental results are shown, and the downward-sloping graph shows the current value and the upward-sloping graph shows the capacitance.

Case 1 is a fuel body in a form in which electricity is taken out by directly contacting an electrode from the outside with a magnesium thin plate 101 having no notch. Case 2 is a fuel body in which electricity is taken out by making a hole in a thin magnesium plate and tightening a conducting wire with a bolt. Case 3 is the magnesium fuel body 100 of the first embodiment.

Table 1 summarizes these results. Table 1 shows the current [A] 10 minutes after the start of each of Case1 to Case3 and the capacitance [Wh] achieved 2 hours later. Case 3, which shows the experimental results of the present invention, shows a higher current value and electric capacity than others. In the case of Case 1, the results fluctuated from experiment to experiment, and there were cases where almost no current could be obtained, but Table 1 shows the best results among them. Even in the case of Case2, the conducting wire is strongly tightened by the bolt, but it cannot be easily attached and detached by fixing with the bolt. In this experiment, magnesium having a reaction area of 25 cm ² and a thickness of 1 mm was used, so the weight of magnesium in this portion is 4.35 g. In the case of Case 3, the current density is 0.18 [A / cm ² ] and the electric capacity is 1.38 [Wh / g].

Current value and electric capacity in Case1 to Case3

As described above, it is possible to provide a magnesium fuel assembly in which a decrease in current due to an oxide film formed on a negative electrode is suppressed by a simple structure, and a magnesium air battery including the magnesium fuel assembly.

(Embodiment 2)
In the second embodiment, a large number of magnesium-air batteries 200 of the first embodiment are connected.

When connecting a large number of magnesium-air batteries, they are connected in parallel or in series, but the magnesium-air batteries of the second embodiment are connected in series. The output voltage of one battery is often around 1 [V], and the current can be several tens [A]. In such a case, if 10 pieces are connected in parallel, the output will be 1 [V] at several hundreds [A], and the resistance of the part connecting these will be much smaller than one hundredth of an ohm. Therefore, it is difficult to obtain electricity by contact. By connecting in series, 10 pieces become 10 [V], and if it is several tens [A], the condition of contact resistance can be relaxed to a fraction of ohm.

The schematic configuration of the magnesium-air battery connector 300 of the second embodiment is shown in the perspective view (a) and the side sectional view (b) of FIG. (However, the connection terminal 205 is omitted for the sake of detailed description later.) Each component is the same as that of the first embodiment, and the detailed description is omitted. In the magnesium-air battery connector 300, a large number of magnesium-air batteries 200 are arranged side by side. At this time, each magnesium-air battery 200 is provided with a spacer 301 that creates a gap on the air side of the cathode 202 because air is required for the battery reaction.

The spacer 301 has a frame-like or girder-like shape having a certain thickness, and even if the cathodes 202 are installed close to each other, a space for taking in air necessary for a battery reaction can be secured. Experiments have shown that the width of the gap obtained by the spacer 301 is sufficient to be 2 to 3 mm in the case of several amperes. The spacer 301 shown in FIG. 7 shows a frame-like shape with rectangular spaces in some places, but this is an example and is not limited to this.

As shown in FIG. 7B, the electrolytic solution tank 204 includes one shared by a large number of magnesium-air batteries 200 connected in series. By the way, the electrolytic solution 203 is conductive, and when adjacent batteries come into contact with each other in the electrolytic solution 203, electric leakage occurs, and it seems that series connection cannot be realized. Similar to the first embodiment, the magnesium-air battery connector 300 is made to contain only the electrolytic solution holding material 201 without contacting the cathode 202 with the electrolytic solution 203. The inventor of the present invention has experimentally found that only the electrolyte holding material 201 and the magnesium fuel body 100 wrapped therein do not leak even if they are immersed in the same electrolyte 203. From this, even if a large number of fuels are connected in series, it is possible to obtain a simple structure in which only one common electrolyte tank is arranged without requiring a structure for electrically shielding each of them.

At this time, the series connection by the connection terminal 205 can be considered as shown in FIG. FIG. 8 is a plan view showing a schematic configuration in which a large number of magnesium-air batteries are connected in series and viewed from above. The connection terminal 205 and the conduction plate 103 of the magnesium-air battery 200 arranged next to each other are connected by a conducting wire 302 and connected in series. The connection terminals 205 and the conduction plate 103 of the magnesium-air battery arranged at both ends are connected to the outside to take out electricity. By using the conducting wire, the batteries can be arranged in close contact with each other, and the whole can be made compact.

Further, the magnesium-air battery connector 300 can be used by being housed in the container 303 as shown in the schematic perspective view of FIG. 9, so that the leakage of the electrolytic solution 203 arranged at the lower part of the battery can be prevented.

The container 303 has a box-like shape with a lid. Since air is required for the battery reaction, it is necessary to provide a structure in which the vicinity of the electrolyte holding material in the container 303 is breathable and does not allow water to pass through. FIG. 10 shows a cross-sectional view of the wall surface of the container 303 in the vicinity of the electrolytic solution holding material 201. The container 303 is provided with a film 304 formed of a breathable and water-impermeable material on the inner wall near the electrolytic solution holding material 201, and is provided with a vent hole 305 for taking in air on the outer wall. The film 304 may be made of a material such as a fluorocarbon resin. The ventilation hole 305 is a hole that serves as a passage for air that sends or sucks air that cools the heat generated by the battery reaction. FIG. 9 shows a vent hole 305 having a plurality of small holes, but the shape is an example and is not limited to this. The battery reaction of magnesium is exothermic and generates about 20 [kJ] per gram of magnesium fuel. When the electrolytic solution evaporates due to this heat, the latent heat of water evaporation is 2.4 [kJ / g], so if this heat generation is used for water evaporation, 8 g of water will evaporate per 1 g of magnesium. .. This requires a great deal of water. Furthermore, since the electrolytic solution is usually salt water, 0.8 g of salt is precipitated by evaporation even in salt water having a concentration of 10%. To prevent this, it is necessary to cool by air cooling. By providing the ventilation holes 304, the heat generated when a large number of batteries are densely connected can be air-cooled from the outside. Air cooling can be performed by sending air through a hole using, for example, a fan.

In order to think about the performance required for the equipment required for air cooling, it will be explained using specific numbers. Assuming that the heat generated by the battery reaction is 20 [kJ / g], if 2000 kJ is generated in 2 hours at 100 g, it is 1000 [kJ / h]. When 12 1 mm thick magnesium plates are connected in series to make 100 g, if the magnesium density is 1.74 [g / cm ³ ], each plate has an area of ^{48 cm 2 and is 0.} At .18 [A / cm ² ], the output of the battery is 0.18 [A / cm ² ] × 48 [cm ² ] × 12 [V], which corresponds to about 103 [W]. On the other hand, air has a specific heat of 1 [kJ / kg / K] and a density of about 1 [kg / m ³ ], so assuming a temperature difference of 50 degrees, it has a cooling capacity of ^{50 [kJ / m 3].} .. Here, assuming that the air flow rate is X [m ³ / h],
50X [kJ / h] = 1000 [kJ / h] ・ ・ ・ (1)
That is, in order to discharge heat of 1000 [kJ / h], X = 20 [m ³ / h] is required. Commercially available small fans have an opening of about 8 cm x 8 cm ^{, have a capacity of 32 CFM (Cubic Feet system) = 55 [m 3} / h], and consume 12 [V] x 0.1 [A] = 1. Since it is about .2 W, it is sufficient for such a system.

As described above, a magnesium fuel body in which a decrease in current due to an oxide film formed on the negative electrode is suppressed by a simple structure, a magnesium air battery including the magnesium fuel body, and a magnesium air battery connection including the magnesium air battery are connected. Can provide the body.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments.

Although the notch 102 in the magnesium fuel body 100 has been described as two in the first embodiment, even if the size of the magnesium thin plate 101 is increased by providing a plurality of notches 102, the effect of a decrease in the current value due to the resistance of the magnesium thin plate 101 itself is exerted. Can be reduced.

Further, FIG. 11 is a cross-sectional view showing a part of the magnesium-air battery of the present invention, which is composed of the magnesium fuel body 100 and the cathode 202, as viewed from the side surface. In the first and second embodiments, the magnesium fuel body 100 has been described as being installed perpendicular to the electrolytic solution tank 204, but the magnesium fuel body 100 and the cathode 202 are tilted horizontally or with respect to the water surface of the electrolytic solution 203. You may. FIG. 11A shows a case where the magnesium fuel body 100 and the cathode 202 are installed vertically, and FIG. 11B shows a case where the magnesium fuel body 100 and the cathode 202 are tilted at an angle. In FIG. 11A, water is sucked up by the capillary phenomenon, but since gravity acts downward, the height at which water reaches within a certain time is limited. This height is 5-6 cm for a practical battery. Therefore, since the height of the reaction area that can be used is limited, the lateral direction is inevitably long. By tilting the magnesium fuel body 100 and the cathode 202 horizontally or with respect to the water surface of the electrolyte 203 (see FIG. 11B), the distance at which water is sucked up even if the height of water sucking up due to the capillary phenomenon remains the same. Can be lengthened, and the reaction area in the magnesium fuel assembly 100 can be increased. From experiments, it has been found that, for example, when the angle is 30 degrees from the horizontal, the length of the reaction portion is 12 cm even if the height direction is 6 cm, and twice the output can be obtained.

(Embodiment 3)
FIG. 12 is a schematic perspective view showing the configuration of the magnesium fuel body 100 of the third embodiment. Similar to the first embodiment, the magnesium fuel body 100 is composed of a magnesium thin plate 101 and a conduction column 103', and functions as a fuel for a magnesium-air battery. The conduction column 103'is inserted into the perforation 102' provided by the magnesium thin plate 101 as shown by the arrow in FIG.

As shown in FIG. 12, the magnesium thin plate 101 is a thin plate of metallic magnesium provided with perforations 102'. The perforation 102'is a perforation that penetrates the magnesium thin plate 101 and has a circular shape in FIG. 2, but the shape does not matter.

The conductive column 103'is formed of a conductive material and has a columnar shape. The contents of this columnar shape may be hollow or tubular.

The conductive column 103'is used by being compressed while being inserted into the perforation 102'. 13 and 14 are cross-sectional views of the magnesium fuel body 100 showing this situation, showing a state in which the conduction column 103'is inserted (FIG. 13) and after compression (FIG. 14). At this time, the inner wall of the perforation 102'and the conductive column 103'are firmly adhered to each other without a gap because the columnar shape of the conductive column 103' is compressed and expanded. Due to this close contact state, the magnesium fuel body 100 of the present embodiment conducts with almost no resistance due to the oxide film.

The magnesium fuel body 100 of the present embodiment can be used as a fuel for a magnesium-air battery in the same manner as shown in the first and second embodiments. This is omitted because it is duplicated.

The experimental results of investigating the current [A] and the electric capacity [Wh] achieved after 2 hours using the magnesium fuel assembly 100 of the third embodiment are the experimental results of the magnesium fuel assembly 100 of the first embodiment described above. That is, it was the same as Table 1.

As described above, magnesium fuel body that suppresses a decrease in current due to oxide film formed on the negative electrode by a simple structure, the magnesium-air battery comprising a magnesium fuel of its, and magnesium-air battery connected with the magnesium-air battery Can provide the body.

100 Magnesium fuel body 101 Magnesium sheet 102 Notch
102'Perforation 103 Conductive plate
103 'conduction pillars 200 magnesium-air battery
300 Magnesium Pneumatic Battery Connector 201 Electrolyte Retaining Material 202 Cathode 203 Electrolyte 204 Electrolyte Tank 205 Connection Terminal 205a Circular Tube 205b Groove 301 Spacer 302 Lead 303 Container 304 Film 305 Vent

Claims (9)

A thin plate of metallic magnesium having a thickness of 1 mm or less provided with an incision and a conductive member for extracting electricity by contact with an external electrode are provided, and the conductive member is inserted into the incision to form the thin plate. It is projected from the back surface, the incised surface of the incised portion and the conductive member are brought into close contact with each other to conduct conduction with almost no resistance due to the oxide film, and the projected portion of the conductive member is brought into close contact with the back surface of the thin plate. A magnesium fuel assembly characterized by being present. The magnesium fuel body according to claim 1, wherein the incised portion is a notch in the thin plate, and the conductive member is a conductive plate. The incision is perforation of the thin, the Ri conductive member is conductive pillars der, after inserting the conductive posts to the perforation, by compressing the ends of the major axis of the conductive pillar, the perforations The magnesium fuel body according to claim 1, wherein the inner wall is brought into close contact with the conductive column without a gap. The magnesium fuel body according to any one of claims 1 to 3 and
With electrolyte
An electrolyte solution holding material formed by capable impregnating material to the electrolyte,
A cathode that sandwiches the electrolyte holding material from both sides,
An electrolytic solution tank installed below the magnesium fuel assembly and storing the electrolytic solution,
With
The electrolyte solution holding member by wrapping crowded said magnesium fuel body, have been inserted between two of said cathode,
The cathode is not immersed in the electrolytic solution, the electrolytic solution holding material is immersed in the electrolytic solution, and the electrolytic solution holding material is impregnated with the electrolytic solution, whereby the battery reaction is started.
A magnesium-air battery that is characterized by this. Before SL Magnesium fuel assembly is installed obliquely inclined with respect to the water surface of the electrolytic solution,
The magnesium-air battery according to claim 4, wherein the magnesium-air battery is characterized in that. The magnesium air according to claim 4 or 5 , further comprising a connection terminal, comprising a groove for supporting the two cathodes and a circular tube portion for connecting a conducting wire electrically connected to the outside. Battery . A plurality of magnesium-air batteries according to any one of claims 4 to 6 are provided.
Connect each in series,
The cathode is not immersed in the electrolytic solution, and the electrolytic solution holding portion and the magnesium fuel body are immersed in the electrolytic solution.
Wherein the plurality of the magnesium air batteries connected in series, share one of the electrolyte bath,
A magnesium-air battery connection that is characterized by this. The magnesium air according to claim 7, wherein a frame-shaped or girder-shaped spacer that forms a gap between the adjacent cathodes to take in air necessary for a battery reaction is provided in the vicinity of the cathode. Battery connector. 7. Magnesium-air battery connector.

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