JP6526865B1 - Metal-air battery and method of setting inter-electrode distance of metal-air battery - Google Patents

Abstract

An object is to efficiently obtain a high performance metal-air battery. In a metal-air battery (10) provided with a metal electrode (15) and air electrodes (13A, 13B) facing the metal electrode (15), the air electrodes (13A, 13B) are disposed on both sides of the metal electrode (15). Of the air electrodes 13A, 13B. [Selected figure] Figure 2

Description

  The present invention relates to a metal-air battery and a method of setting the distance between electrodes of the metal-air battery.

  Generally, in a metal-air battery, an air electrode which is a positive electrode and a metal electrode which is a negative electrode exist in a pair. Further, a configuration in which air electrodes are disposed equidistantly on both sides of a metal electrode (fuel electrode) is also proposed for a metal-air battery (see, for example, Patent Document 1).

JP, 2015-99740, A

By the way, since the metal-air battery mainly reacts on the surface where the air electrode and the metal electrode face each other, the reaction area per cell is restricted when the air electrode is configured to face only one side of the metal electrode, There are limitations in improving battery performance. For example, since the current density when current flows increases, as a result, the polarization tends to increase.
On the other hand, in the configuration of Patent Document 1, the current density is reduced by increasing the air electrode area per cell, and as a result, the polarization is reduced. However, higher performance batteries are desired from the market, and particularly for metal-air batteries for disasters, charging applications such as smartphones capable of high current charging are desired. That is, the metal-air battery needs to further reduce the polarization.

  Then, an object of this invention is to obtain a high performance metal air battery efficiently.

In order to solve the problems described above, the present invention relates to a metal-air battery including a metal electrode and an air electrode facing the metal electrode, wherein the air electrodes are respectively disposed on both sides of the metal electrode, and the metal electrode is A first distance between the metal electrode and one of the air electrodes, and a first distance between the metal electrode and one of the air electrodes, and a pole of the metal electrode and the other air electrode. The second distance, which is the distance between, is obtained under the following conditions: a voltage obtained from the first battery in which the metal pole and the one air pole are disposed at the first distance, the metal pole and the other air The average value of the voltage obtained from the second battery in which the pole is placed at the second distance is higher than the voltage obtained when the metal pole is placed at the central position of the air pole on both sides, It is characterized by

  Further, in the above configuration, when the shorter inter-electrode distance is a value LA and the longer inter-electrode distance is a value LB, the value (LB / LA) may be 2 or more.

  Further, in the above configuration, a support member may be provided to float and support the metal electrode from the bottom plate portion of the battery case accommodating the metal electrode.

  In addition, a metal electrode and an air electrode facing the metal electrode are provided, and the air electrodes are disposed on both sides of the metal electrode, and the metal electrode is brought close to any one of the air electrodes on both sides. A method for setting an interelectrode distance of a metal-air battery disposed at a position, comprising: a first distance which is an interelectrode distance between the metal electrode and one of the air electrodes; and an electrode distance between the metal electrode and the other air electrode. And a voltage obtained from a first battery in which the metal electrode and the one air electrode are disposed at the first distance based on the non-linear characteristic indicating the relationship between the distance between the electrodes and the voltage. The average value of the voltage obtained from the second battery in which the metal electrode and the other air electrode are arranged at the second distance is obtained when the metal electrode is arranged at the central position of the air electrodes on both sides. It is set to be higher than the voltage to be

According to the present invention , a high voltage can be easily obtained while securing a capacity, and a high performance metal-air battery can be obtained efficiently.

It is a perspective view of the metal air battery concerning the embodiment of the present invention. It is an AA longitudinal cross-sectional view of FIG. (A) shows Example 1, (B) shows Comparative Example 1, (C) shows Comparative Example 2. It is the figure which showed the result of the capacity | capacitance test of Example 1, the comparative example 1, and the comparative example 2. FIG. It is the figure which showed the polarization test for every combination of distance LA, LB between poles. It is the figure which showed the result of the constant current discharge test for every combination of distance LA, LB between electrodes. It is a figure of the nonlinear characteristic which shows the relation between distance [mm]-voltage [V] between poles. It is the figure which showed the polarization test result for every combination of other inter electrode distance LA and LB. It is the figure which showed the result of the constant current discharge test for every combination shown in FIG.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view of a metal-air battery 10 according to an embodiment of the present invention, and FIG. 2 is a longitudinal sectional view taken along line A-A of FIG.
The metal-air battery 10 includes a battery case 11 (also referred to as a cell), in which two air electrodes 13A and 13B and one metal electrode 15 are disposed, and in the battery case 11, an electrolytic solution is contained. It is a primary battery that starts power generation by being injected. At the time of power generation, the air electrodes 13A and 13B function as a positive electrode, and the metal electrode 15 functions as a negative electrode. In addition, the code | symbol UL has shown the upper surface position of the electrolyte solution inject | poured into the battery case 11 in FIG.

  The material of the battery case 11 is not particularly limited, but, for example, paper or resin can be used. In the case where the battery case 11 is made of paper, a sheet material provided with a film on the surface of the paper constituting the base material is used. To give a specific example, a heat fusible resin (for example, polyethylene (PE)) It is possible to use laminated paper at least the inner surface of which is laminated. By applying the laminating process, it is possible to prevent leakage of the electrolytic solution and the like.

  In the present description, each direction such as top, bottom, left, or right corresponds to the direction when using the metal air battery 10, the symbol X shown in FIG. 1 etc. indicates the forward direction, the symbol Y indicates the right direction, the symbol Z indicates the upward direction. The X direction coincides with the alignment direction of the air electrode 13A, the metal electrode 15, and the air electrode 13B. Note that the installation direction may be changed depending on the usage conditions and the like.

The battery case 11 is a thin rectangular parallelepiped shape, and by folding a sheet containing paper, the bottom plate portion 21 constituting the bottom surface of the battery case 11, the front wall portion 22 constituting the front surface, and the rear surface A wall portion 23, left and right side wall portions (left wall portion, right wall portion) 24 constituting left and right side surfaces, and an upper plate portion 25 constituting an upper surface are integrally provided.
The front wall portion 22 and the rear wall portion 23 are surfaces of the same shape, arranged in parallel with each other, forming the largest surface in the battery case 11, and having a rectangular opening 22K of the same shape and size. have. The opening 22K of the front wall 22 is covered with a rectangular air electrode 13A, and the opening 22K of the rear wall 23 is covered with a rectangular air electrode 13B.

The air electrodes 13A and 13B are formed in the same shape and the same size, and are disposed on both sides of the metal electrode 15, respectively. Each of the air electrodes 13A and 13B is a member having air-permeability that allows external air to flow in the battery case 11 and non-liquid-permeability that does not leak the electrolyte solution, for example, a rectangular shape that constitutes a current collector. The catalyst sheet which comprises a catalyst layer is integrated by pressure (press) etc. on both surfaces of the copper mesh (it is also called an electrical power collector) of this.
The air electrodes 13A and 13B are exposed in the battery case 11 through the openings 22K provided in the battery case 11, and the regions in the openings 22K substantially function as the air electrodes 13A and 13B. The liquid impermeability may be ensured by separately providing a sheet having liquid imperviousness. Also, the air electrodes 13A and 13B are not limited to the above-described configuration, and widely known configurations can be applied.

  The current collector is a porous current collector, and has good air permeability by forming a rectangular copper mesh (copper reticulated body). The current collector is not limited to copper, and may be another metal such as iron, nickel and brass. Moreover, it is not limited to the porous structure which consists of meshes (net-like body), The porous structure which has air permeability other than a mesh is widely applicable. In particular, a copper mesh is suitable in terms of both battery characteristics and cost.

In the catalyst sheet, a paste obtained by kneading a conductive agent and an organic binder with water is sandwiched by a film made of polyethylene terephthalate (PET) (hereinafter referred to as a PET film), pressed by a roller press to form a sheet, and dried It is manufactured through the process.
The conductive agent may be carbon powder, a metal material such as copper or aluminum, or an organic conductive material such as polyphenylene derivative. The carbon powder is preferably a powder of carbon black such as ketjen black, graphite, activated carbon, carbon nanotubes, or carbon nanohorns.
The organic binder is a polymer dispersion, and specifically, a thermoplastic resin such as polytetrafluoroethylene (PTFE, a fluorine-based resin such as Teflon (registered trademark)), or a polyolefin-based resin such as polypropylene (PP) Is preferred.

  The metal electrode 15 is supported in the battery case 11 by a pair of left and right support members 30 and faces the air electrodes 13A and 13B. The metal electrode 15 is formed of a metal plate made of a magnesium alloy and disposed in parallel to the air electrodes 13A and 13B. An aqueous solution of sodium chloride is used as the electrolyte of the metal-air battery 10. That is, the metal air battery 10 of the present embodiment is a magnesium air battery. The magnesium-air battery can use seawater as the electrolytic solution or a liquid obtained by mixing salt with tap water, so the electrolytic solution can be easily procured. In addition, you may comprise so that it may be comprised so that the bag body which accommodated the sodium chloride which is electrolyte may be previously arrange | positioned inside the battery case 11, and water, such as tap water, may be injected. The mass of sodium chloride in the electrolytic solution is preferably 4% to 18% with respect to the mass of the solvent. If it is less than 4%, the electrolyte resistance will be large and performance as a battery can not be expected due to insufficient electrolyte, and if it exceeds 18%, the electrolyte will be gradually evaporated with discharge and salt will be deposited to become resistance and the performance as a battery It is because it can not be expected.

The metal electrode 15 has a pair of left and right tab parts 15A1 extending upward and exposing the electrolyte above, and one of the tab parts 15A1 is used as a wiring connection part for connecting the electric wiring 52 (FIG. 3) Ru.
As shown in FIG. 1, notches 15A2 which are notched upward are formed at the left and right lower end portions of the metal pole 15, and the outer shape of each notch 15A2 matches the outer shape of the tab 15A1. Do. Thereby, the upper surface and the lower surface of the metal electrode 15 are formed in the same shape, and when cutting out the metal electrode 15 from a single metal plate (in the present configuration, a plate of magnesium alloy), cutting out continuously without leaving a gap. Becomes possible.

  In this configuration, when the metal electrode 15 is inserted into the battery case 11 together with the pair of left and right support members 30, the metal electrode 15 is positioned on the battery case 11 by the support member 30. Thereby, the metal electrode 15 faces the air electrodes 13A and 13B exposed to the inside through the opening 22K, and the distance LA between the air electrodes 13A and 13B and the metal electrode 15 is an interelectrode distance LA. , LB are kept constant respectively. The support member 30 may be inserted in advance into the battery case 11 and then the metal electrode 15 may be inserted.

  A pair of left and right support members 30 are formed of the same component, and more specifically, the support member main body 31 which is detachably mounted on the metal pole 15 and extends in the vertical direction (Y direction); A plurality of (four) contact portions 41 that project from the support member main body 31 and contact the inner surface of the battery case 11 are provided. Each contact portion 41 includes a pair of upper and lower front projecting portions 42 projecting forward from the supporting member main body 31 (+ X direction), and a pair of upper and lower rear sides projecting backward from the supporting member main body 31 (−X direction) And an overhang portion 43.

When the support member 30 is inserted into the battery case 11, the projecting surface of the front projecting portion 42 of the supporting member 30 contacts the front wall 22, and the projecting surface of the rear projecting portion 43 contacts the rear wall 23. Thus, the front and back position of the metal pole 15 supported by the support member 30 is positioned. Further, the front side projecting portion 42 also protrudes to the left and right outside and abuts on the side wall portion 24 of the battery case 11 to position the left and right positions of the metal electrode 15. As a result, the metal electrode 15 can be positioned in the battery case 11, and the inter-electrode distances LA, LB, etc. can be held constant.
Further, the pair of left and right support members 30 support the metal electrode 15 by floating from the bottom plate portion 21 of the battery case 11.

  By the way, when the metal electrode 15 which is a negative electrode active material has a sufficient amount, the battery capacity depends on the amount of water which is a solvent of the electrolytic solution. Therefore, the inventors conducted various studies in order to obtain a high generated voltage while securing the capacity in an air battery having the same battery volume. In this configuration, as shown in FIG. 2, by arranging the metal electrode 15 at a position close to one of the air electrodes 13A and 13B on both sides, a high generated voltage is obtained while securing the capacity. Hereinafter, Examples and Comparative Examples will be described. The examples are not limited to the following.

  3 (A) shows Example 1, FIG. 3 (B) shows Comparative Example 1, and FIG. 3 (C) shows Comparative Example 2. As shown in FIG. 3A to 3C show the cross-sectional structures at the left and right center of the metal-air battery 10 according to Example 1 and Comparative Examples 1 and 2, respectively. In each of the drawings, reference numeral 51 denotes an electric wiring connected to the air electrodes 13A and 13B, and reference numeral 52 denotes an electric wiring connected to the metal electrode 15.

  The first embodiment is a configuration in which the metal electrode 15 is disposed close to one air electrode 13A, and can be described as an offset type. On the other hand, the comparative example 1 is the structure which has arrange | positioned the metal pole 15 in the center of air pole 13A, 13B of both sides, and in the following, it describes suitably with center arrangement | positioning type. Further, Comparative Example 2 has a configuration in which the air electrode 13B on the right side is removed from Example 1, that is, it is a single-sided type in which the air electrode 13A is disposed only on one side of the metal electrode 15.

FIG. 4 is a view showing the results (capacitance-voltage characteristics) of the constant current discharge test of the three types of metal air batteries 10 under the following conditions. The characteristic diagram shown in FIG. 4 and each figure to be described later has an inner volume of 650 cm ³ and a metal case 11 having 150 mm of four sides and 3 mm of thickness in the battery case 11 having a separation distance of 26 mm between the air electrode 13A and the air electrode 13B. It is the result of performing a constant current discharge test using No. 15. In addition, about 600 cm ³ of saline was injected as an electrolytic solution into the battery case.

In the constant current discharge test, constant current discharge is continued until the battery voltage reaches 0 V (until the metal electrode 15 is consumed and the battery life is reached) under a normal temperature (25 ° C.) environment until the battery voltage reaches 0 V It is a test. The horizontal axis in FIG. 4 is the battery capacity [Ah], and the vertical axis is the battery voltage [V].
As shown in FIG. 4, in Example 1, the polarization is smaller than in Comparative Examples 1 and 2, and it can be seen that the polarization is maintained until the end of the discharge while the polarization is small. Although the voltage of the comparative example 1 was higher than that of the comparative example 2, the voltage was lower than that of the comparative example 1.

Next, in order to confirm the influence of the inter-electrode distance, a test was conducted using the same battery as that of Example 1 except that a plurality of inter-electrode distances LA and LB were used. The test results are shown in FIG. 5 (polarization test) and FIG. 6 (constant current discharge test).
In the polarization test, after the electrolyte solution is injected, it is left for 3 minutes for the purpose of aligning the battery state under the same conditions and activating the reaction, and then connected to a discharge device for 10 minutes equivalent to 2A. The current was applied and then rested for 3 minutes. Next, at each current value when current of 1.0 A, 1.5 A, 2.0 A, 2.5 A, 3.0 A, 4.0 A, 5.0 A, 6.0 A is applied for 5 minutes each. The average discharge voltage is measured.
FIG. 5 is a diagram showing the current-voltage relationship for each combination of inter electrode distances LA and LB. The horizontal axis represents battery current [A], and the vertical axis represents average battery voltage [V].

  As shown in FIG. 5, the combination of the distances between the electrodes of 0.5 mm and 22.5 mm provided relatively high voltage values at any current value. Other than this combination, good results were obtained in the order of the combination of distance between poles 5.5 mm and 17.5 mm, and the combination of distance between poles 9.5 mm and 13.5 mm. On the other hand, the combination of the inter-electrode distances 11.5 mm and 11.5 mm corresponding to Comparative Example 2 had the lowest voltage at any current value.

  According to the study of the inventors, it is possible to efficiently improve the voltage when the value (LB / LA) is 2 or more, where the shorter distance between the electrodes is the value LA. When the value (LB / LA) is 2 or more, in the example of FIG. 5, the combination of inter-electrode distances 0.5 mm and 22.5 mm and the combination of inter-electrode distances 5.5 mm and 17.5 mm.

  FIG. 6 is a diagram showing the results of the constant current discharge test for each combination of inter electrode distances LA and LB, the horizontal axis is the battery capacity [Ah], and the vertical axis is the battery voltage [V]. The constant current discharge test was conducted in the same manner as in Example 1.

As shown in FIG. 6, substantially all the capacitances did not change in all combinations of the distances LA and LB shown in FIG. This indicates that even if the distance between the electrodes is changed as in each combination of the distances LA and LB, the influence on the capacitance is small.
However, if the distance LA or LB between the electrodes is too narrow, a reaction product is deposited between the air electrodes 13A, 13B and the metal electrode 15, resulting in a decrease in discharge capacity. From this, it is preferable that at least the distance between the electrodes be 0.5 mm or more, and by setting the distance to 0.5 mm or more, the reaction products generated along with the discharge are mostly between the air electrodes 13A and 13B and the metal electrode 15. The effect on power generation can be suppressed without depositing.

Furthermore, it is preferable to set the values of the inter-electrode distances LA and LB based on the non-linear characteristic indicating the relationship between the inter-electrode distance [mm] -voltage [V]. Hereinafter, the method of setting the distance between the poles will be described.
FIG. 7 is a diagram of non-linear characteristics (hereinafter referred to as a characteristic curve f1) showing the relationship between the distance between electrodes [mm] -voltage [V]. This characteristic curve f1 is a curve which is uniquely determined when the air electrodes 13A and 13B, the metal electrode 15 and the like are determined.

By using this characteristic curve f1, as shown in FIG. 7, the voltage VA of the first battery consisting of a pair of electrode plates (metal electrode 15 and air electrode 13A) disposed opposite to each other with a gap LA between the electrodes and It is possible to calculate the voltage VB of the second battery composed of a pair of electrode plates (metal electrode 15 and air electrode 13B) disposed opposite to each other with a gap LB between the electrodes.
The sum of the calculated values VA and VB can be regarded as the voltage of the metal-air battery 10 shown in FIG. 2 set to the inter-electrode distance LA and LB.

Further, as shown in FIG. 7, based on the characteristic curve f1, the voltage VC of the battery consisting of a pair of electrode plates (metal electrode 15 and air electrode 13A) opposed to each other with an inter-electrode distance LC of the center arrangement type. calculate. The value obtained by doubling the calculated voltage VC can be regarded as the voltage of the central arrangement type metal air battery 10.
Then, the inter-pole distances LA and LB are set such that the following equation (1) is established.

(VA + VB)> 2 × VC
= (VA + VB) / 2> VC (1)

The above equation (1) indicates that the average value of the voltage VA and the voltage VB is larger than the voltage VC of the center arrangement type.
By setting the distances LA and LB so as to satisfy this equation (1), it is possible to obtain a higher voltage than in the center arrangement type.

  In short, the inter-electrode distances LA and LB are voltages obtained from the first battery in which the metal electrode 15 and the air electrode 13A are disposed with the inter-electrode distance LA between them based on the characteristic curve f1 showing the relationship between the electrode distance-voltage. The average value of VA and the voltage VB obtained from the second battery in which the metal electrode 15 and the air electrode 13B are disposed with the distance LB between the electrodes is such that the metal electrode 15 is at the central position of the air electrodes 13A and 13B on both sides. It is set to be higher than the voltage VC obtained when arranging. This makes it possible to easily set the inter-electrode distances LA and LB at which a high voltage can be obtained with respect to the metal-air battery 10 in which the metal electrode 15 is moved to one of the air electrodes 13A and 13B on both sides.

In FIGS. 8 and 9, a metal air battery using an inner volume of 350 cm ³ , a battery case 11 with a separation distance of 14 mm between the air electrode 13 A and the air electrode 13 B and a metal electrode 15 with 3 mm thickness and 150 mm on four sides. The result of having performed the polarization test and constant current discharge test of 10 is shown. A salt solution of about 330 cm ^{3 was} injected into the battery case 11 as an electrolytic solution.

FIG. 8 is a view showing the polarization test result for each combination of the distances LA and LB between the other electrodes, and shows the relationship between the current value and the voltage. The polarization test was left to stand for 3 minutes as described above, and then connected to a discharge device to apply a current of -2 A for 10 minutes, and then rest for 3 minutes. Next, when the current of 1.0A, 2.0A, 3.0A, 4.0A, 5.0A, 6.0A is applied for 5 minutes, the average voltage at each current value is measured. .
FIG. 9 is a diagram showing the results of the constant current discharge test for each combination shown in FIG. 8, in which the horizontal axis is the battery capacity [Ah] and the vertical axis is the battery voltage [V]. The constant current discharge test was conducted in the same manner as in Example 1.

  As shown in FIG. 8, when the combination of the inter-electrode distances LA and LB is a combination of inter-electrode distances 0.5 mm and 10.5 mm, and the combination of inter-electrode distances 4.5 mm and 6.5 mm, the inter-electrode distance Higher voltages were obtained in the order of the combination of the distances 0.5 mm and 10.5 mm and the distance between the electrodes 4.5 mm and 6.5 mm. On the other hand, the combination of the distance between the poles 5.5 mm and 5.5 mm corresponding to the center arrangement type had the lowest voltage.

  As shown in FIG. 9, it is confirmed that the capacity does not substantially change in all combinations of the inter-electrode distances LA and LB shown in FIG. Therefore, it can also be understood from FIG. 8 that a high voltage can be obtained while securing the capacity by moving the metal electrode 15 to one of the air electrodes 13A and 13B on both sides.

  As described above, in the metal-air battery 10 of this embodiment, the air electrodes 13A and 13B are disposed on both sides of the metal electrode 15, and the metal electrode 15 is brought close to any one of the air electrodes 13A and 13B on both sides. Being arranged at a position, it is easy to obtain a high voltage while securing a capacity. Therefore, a high performance metal-air battery can be obtained efficiently.

  Further, the distance LA (corresponding to a first distance) between the metal electrode 15 and one air electrode 13A and the distance LB (corresponding to a second distance) between the metal electrode 15 and the other air electrode 13B are Meet the conditions of The condition is that the voltage VA obtained from the first battery in which the metal electrode 15 and one of the air electrodes 13A are arranged at the interelectrode distance LA, and the metal electrode 15 and the other air electrode 13B are arranged with the interelectrode distance LB The average value of the voltage VB obtained from the second battery is higher than the voltage VC obtained when the metal electrode 15 is disposed at the central position of the air electrodes 13A and 13B on both sides. This makes it possible to obtain a higher voltage than the central arrangement type.

  In addition, as a method of setting the distance between the electrodes, the distance between the electrodes LA and LB is arranged with the distance LA between the metal electrode 15 and the air electrode 13A based on the characteristic curve f1 indicating the relationship between the distance between the electrodes and the voltage. The average value of the voltage VA obtained from the first battery and the voltage VB obtained from the second battery in which the metal electrode 15 and the air electrode 13B are disposed with the distance LB between the electrodes is the air electrode on both sides of the metal electrode 15. Since the voltage is set to be higher than the voltage VC obtained in the middle position of 13A and 13B, it is possible to easily set the inter-electrode distances LA and LB at which high voltages can be obtained.

Furthermore, when the shorter inter-electrode distance is the value LA, and the longer inter-electrode distance is the value LB, the inter-electrode distance LA, LB can be obtained by setting the value (LB / LA) to 2 or more. Can be set more easily.
Furthermore, by setting the value LA of the inter-electrode distance to 0.5 mm or more, the reaction product generated along with the discharge is hardly deposited between the air electrodes 13A, 13B and the metal electrode 15, and power can be generated. It is easy to suppress the influence of

  Further, the metal air battery 10 of the present embodiment is provided with a pair of left and right support members 30 that support the metal electrode 15 by floating it from the bottom plate portion 21 of the battery case 11. As a result, it is possible to suppress the deposition of the reaction product generated along with the discharge and to promote the convection of the electrolytic solution, and it is possible to effectively suppress the influence of the reaction product on the cell reaction. is there.

The present invention is not limited to the embodiments described above, and various modifications and changes are possible based on the technical concept of the present invention. For example, each part of the metal air battery 10 including the air electrodes 13A and 13B and the metal electrode 15 may be appropriately changed.
Moreover, the metal electrode 15 may use not only a magnesium alloy but another raw material. As another raw material, metals, such as zinc, iron, aluminum, or an alloy containing any of these can be mentioned, for example. When zinc is used for the metal electrode 15, a potassium hydroxide aqueous solution may be used for the electrolytic solution, and when iron is used for the metal electrode 15, an alkaline aqueous solution may be used for the electrolytic solution. . When aluminum is used for the metal electrode 15, an electrolyte containing sodium hydroxide or potassium hydroxide may be used.

DESCRIPTION OF SYMBOLS 10 metal air battery 11 battery case 13A, 13B air pole 15 metal pole 21 bottom plate part)
22 front wall 22K opening 23 back wall 24 side wall 30 support member LA, LB, LC distance between poles VA, VB, VC voltage f1 characteristic curve (non-linear characteristic showing relation between distance between electrodes)

Claims (4)

In a metal-air battery comprising a metal electrode and an air electrode facing the metal electrode,
The air electrode is disposed on both sides of the metal electrode,
The metal electrode is disposed at a position close to one of the air electrodes on both sides ,
The first distance, which is the distance between the metal pole and one of the air electrodes, and the second distance, which is the distance between the metal pole and the other air electrode, satisfy the following conditions:
That is, a voltage obtained from the first battery in which the metal electrode and the one air electrode are arranged at the first distance, and a second battery in which the metal electrode and the other air electrode are arranged at the second distance Higher than the voltage obtained when the metal electrode is placed at the central position of the air electrode on both sides.
Metal-air battery characterized by satisfying . The metal-air battery according to claim 1, wherein the value (LB / LA) is 2 or more when the shorter distance between the electrodes is a value LA and the longer distance between the electrodes is a value LB. . The metal air battery according to any one of claims 1 and 2, further comprising a support member for floatingly supporting the metal electrode from a bottom plate portion of a battery case accommodating the metal electrode. A metal electrode and an air electrode facing the metal electrode,
  The air electrode is disposed on each side of the metal electrode,
  A method for setting an interelectrode distance of a metal-air battery, wherein the metal electrode is disposed at a position close to one of the air electrodes on both sides.
  A first distance which is a distance between the metal pole and one of the air electrodes, and a second distance which is a distance between the metal pole and the other air electrode;
  A voltage obtained from a first battery in which the metal electrode and the one air electrode are disposed at the first distance based on a non-linear characteristic indicating a relationship between an inter-electrode distance and a voltage; The average value of the voltage obtained from the second battery in which the air electrode is disposed at the second distance is higher than the voltage obtained when the metal electrode is disposed at the central position of the air electrode on both sides. A method of setting a distance between electrodes of a metal-air battery characterized in that the setting is made.

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