JP2015122302A - Metal-air battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a metal-air battery, capable of supporting a metal electrode in a simple configuration, advantageous in securing an amount of an electrolyte and weight reduction.SOLUTION: An exterior body 11 is formed of a sheet material containing paper. The sheet material covers a magnesium electrode 15 with a gaps SF, SR and integrally includes a pair of upper plate part component pieces 25F, 25R that cross the gaps SF, SR by folding part of the sheet material and function as supporting folding parts for supporting the magnesium electrode 15.

Description

  The present invention relates to a metal-air battery having an air electrode and an exterior body that houses the metal electrode.

There are known metal-air batteries that can generate electricity when an electrolyte such as saline is injected in a natural disaster, storm and flood damage, or in an environment where it is difficult to obtain an AC power supply. Generally, a metal can or a resin container is used for an exterior body of a metal-air battery. However, since this type of exterior body requires a packing and a sealing material for preventing leakage of the electrolyte, the number of members increases, resulting in an increase in the number of assembly steps and cost. Further, the electrolyte solution may leak due to defective or deteriorated packing or sealing material. Moreover, the metal can and the outer package of the resin container become heavy.
Further, in a metal-air battery, a negative electrode material composed of a positive electrode, a separator, and a gel metal is wrapped with an outer package formed of a laminate sheet including a heat-fusible resin layer, and the volume occupancy of the negative electrode material in the battery is 40. % Or more and 90% or less is proposed (for example, see Patent Document 1).

JP 2004-288571 A

However, the configuration described in Patent Document 1 includes a power generation element having a thickness by laminating an air diffusion paper, an air electrode sheet, a separator, a gelled negative electrode metal, and a negative electrode assembly. And the positive electrode laminate sheet are housed and held in a recess formed between the positive electrode side laminate sheet and the number of components is large, and the amount of the electrolyte is reduced.
When the amount of the electrolytic solution is small, a battery that consumes the electrolytic solution by a discharge reaction cannot obtain a sufficient capacity. Further, if any power generation element part (for example, a separator) is omitted in order to reduce the number of parts, the metal electrode (negative electrode) cannot be supported, and it is difficult to reduce the number of parts. In addition, if the number of parts is large, an increase in assembly man-hours and an increase in weight are caused, which is disadvantageous for cost reduction.

  The present invention has been made in view of the above-described circumstances, and an object thereof is to provide a metal-air battery that can support a metal electrode with a simple configuration and is advantageous in securing the amount of electrolyte and reducing the weight. .

  In order to solve the above-described problems, the present invention provides a metal-air battery including an exterior body that has an air electrode and accommodates a metal electrode facing the air electrode, and the exterior body is formed of a sheet material containing paper. The sheet material covers the metal electrode with a gap, and includes a bent portion for supporting the metal electrode integrally by bending a part of the sheet material to cross the gap. To do. According to this configuration, the metal electrode can be supported with a simple configuration in which a part of the exterior body formed of a sheet material containing paper is bent, and it is advantageous for securing the amount of electrolyte and reducing the weight.

It is preferable that the supporting bent portion holds the metal electrode at a position separated from the air electrode. According to this configuration, the metal electrode and the air electrode can be reliably separated from each other, so that the electrolyte can be sufficiently held between the electrodes.
Further, the supporting bent portion is a first bent portion that is bent toward the metal electrode from the wall portion on the air electrode side with respect to the metal electrode in the sheet material and from the wall portion on the opposite side to the air electrode. You may make it have a bending part and the 2nd bending part which is bent from the front-end | tip of the said 1st bending part, and contact | abuts to the said metal electrode. According to this configuration, the metal electrode can be supported with a simple bending structure.

  The first bent portion may be provided above the liquid level of the electrolyte in the outer package and may be inclined obliquely downward toward the metal electrode. According to this configuration, it is difficult for the electrolytic solution to come out by the first bent portion, and the electrolytic solution attached to the lower surface of the first bent portion can be returned efficiently.

  In addition, the metal electrode has a tab portion protruding upward, the supporting bent portion extends across the width of the metal electrode, and the supporting bent portion is in the width direction of the metal electrode, The tab part is divided on the basis of the boundary between the tab part and the non-tab part without the tab part, and one of the divided part on the tab part side and the divided part on the non-tab part side is an air electrode of the metal electrode. The movement to the side may be restricted, and the other may restrict the movement of the metal electrode to the opposite side of the air electrode. According to this configuration, both the movement of the metal electrode to the air electrode side and the movement to the opposite side can be regulated by the divided portions of the supporting bent portion while avoiding the tab portion.

Moreover, you may make it the said exterior body have the baseplate part bent by the downward convex shape in which the lower end of the said metal electrode fits. According to this configuration, the lower end of the metal electrode can be positioned with a simple bending structure, and deviation can be prevented.
In addition, the supporting bent portion is bent to the inside of the exterior body along the metal electrode from the wall portion on the air electrode side and the wall portion on the opposite side of the air electrode, and is folded back to the opposite side. The metal electrode has a folded portion that protrudes to the outside of the exterior body, sandwiches the metal electrode with a part of each folded portion, and joins the remaining projecting portions outside the exterior body to each other between the folded portions You may make it seal. According to this configuration, it is possible to suppress evaporation and leakage of the electrolytic solution, to prevent deformation of the outer package, and to suppress displacement of the metal electrode.

Moreover, you may make it the said exterior body provide the sheet piece joined to the side wall part which continues to the cover part which covers the upper direction of the said metal electrode, and covers the side of the said metal electrode. According to this configuration, evaporation and leakage of the electrolytic solution can be suppressed with a simple configuration, and deformation of the exterior body can be further prevented.
Further, it is a sheet material containing paper, comprising a bottom plate sheet portion bent into a downward convex shape into which a lower end of the metal electrode fits, and the bottom plate sheet portion is a pair of front and rear sheets on the sheet material forming the exterior body. At least one of the end portions may be joined. According to this configuration, it is possible to suppress the displacement of the metal electrode and to prevent the exterior body from being damaged by the metal electrode.

  Further, the sheet material forming the exterior body is bent into a concave shape opening upward to form a bottom plate portion of the exterior body, and the bottom plate sheet portion is a state in which the sheet material forming the exterior body is developed in a planar shape And at least one of a pair of front and rear end portions joined to the sheet material so as to straddle the bottom plate portion, and when the sheet material is bent into the concave shape opening upward, the exterior is arranged so as to be separated from the bottom plate portion. It may have a pair of upright portions that stand on the inner side of the body, and a lower end of the metal electrode may be fitted between the pair of upright portions. According to this structure, a baseplate sheet | seat part can be assembled easily.

In addition, an electrolyte container that houses an electrolyte for operating as a battery by pouring water into the exterior body may be provided on the surface of the metal electrode opposite to the air electrode. According to this structure, while making it the structure which can be utilized as a battery only by putting the solvent of electrolyte solution, the corrosion of the metal electrode by the influence of electrolyte can be suppressed.
The electrolyte container is a sheet material containing paper, and is attached to the electrode plate mounting sheet on the surface of the metal electrode opposite to the air electrode, and joined to the electrode plate mounting sheet to form the electrolyte. It is also possible to provide a bag body that accommodates. According to this configuration, the sheet material can suppress corrosion of the metal electrode due to the influence of the electrolyte, and it is not necessary to attach the bag body containing the electrolyte to the exterior body, and the configuration of the exterior body can be easily simplified. The bag can be easily attached.

Further, the electrode plate mounting sheet may be fixed by pressure to the metal electrode, and the bag body may be fused to the electrode plate mounting sheet. According to this configuration, the electrode plate mounting sheet and the bag body can be easily attached.
Further, the electrode plate mounting sheet has a restricting portion that controls a movement of the metal electrode with respect to the sheet by bending a part of the sheet, and the metal plate by holding the electrode plate mounting sheet on the exterior body. You may make it hold | maintain a pole to the said exterior body. According to this configuration, a structure for directly holding the metal electrode on the exterior body side becomes unnecessary, and the exterior body can be easily made into a simple structure.

  The sheet material is preferably paper laminated with a heat-fusible resin. According to this configuration, for example, by setting the paper ratio to exceed 50%, it is easy to separate and dispose of the paper according to the rules of each local government, and to easily obtain it.

  ADVANTAGE OF THE INVENTION According to this invention, while being able to support a metal electrode by simple structure, the metal air battery advantageous to ensuring of the quantity of electrolyte solution and weight reduction can be provided.

It is the figure which showed the magnesium air battery which concerns on 1st Embodiment of the metal air battery of this invention. It is the figure which looked at the magnesium air battery from back, upper direction, and right. It is the figure which expand | deployed the exterior body of 1st Embodiment. It is IV-IV sectional drawing of FIG. It is VV sectional drawing of FIG. It is a perspective view of the exterior body of a 2nd embodiment. It is the figure which expand | deployed the exterior body of 2nd Embodiment. It is a figure of 2nd Embodiment, (A) is the figure which looked at the exterior body from the front, (B) is AA sectional drawing of FIG. 8 (A). It is a partial expanded view of the modification of 2nd Embodiment, (A) is the figure which formed the upper board part long, and provided one handle, (B) formed the upper board part long, and provided two handles. It is a figure. It is a figure of 3rd Embodiment, (A) is the figure which looked at the exterior body from the front, (B) is BB sectional drawing of FIG. 10 (A). It is a perspective view of the baseplate sheet | seat part of 3rd Embodiment. It is a perspective view of the magnesium air battery which concerns on 4th Embodiment. It is a sectional side view of the magnesium air battery of 4th Embodiment. It is a figure of 4th Embodiment, (A) is the perspective view which looked at the electrolyte container from the air electrode side with the magnesium electrode, (B) is the perspective view seen from the air electrode opposite side. It is a sectional side view of the magnesium air cell which concerns on the modification of 4th Embodiment. It is a figure of the modification of 4th Embodiment, (A) is the perspective view which looked at the electrolyte container from the air electrode side with the magnesium electrode, (B) is the perspective view seen from the air electrode opposite side. It is a perspective view of the magnesium air battery which concerns on 5th Embodiment. It is a perspective view of the exterior body of 5th Embodiment. It is a figure of 5th Embodiment, (A) is the figure which expand | deployed the exterior body, (B) is a figure corresponded to the X area | region of FIG. 18, (C) is a figure equivalent to the Y area | region of FIG. ) Is a diagram corresponding to the Z region of FIG.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
(First embodiment)
FIG. 1 is a view showing a magnesium-air battery according to a first embodiment of the metal-air battery of the present invention.
The magnesium-air battery 10 includes a hollow box-shaped exterior body (also referred to as a casing) 11 formed of a foldable sheet material. An air electrode 13 is attached to the exterior body 11, and a magnesium electrode (metal electrode) 15 is accommodated so as to face the air electrode 13. The magnesium-air battery 10 is a primary battery in which the air electrode 13 acts as a positive electrode and the magnesium electrode 15 acts as a negative electrode.
Each direction such as up, down, left, and right shown in FIG. 1 and each drawing described later corresponds to each direction when the magnesium-air battery 10 is used as a battery, and is the same as each direction used in the following description.

FIG. 2 is a view of the magnesium-air battery 10 as viewed from three directions (rear, upper, right). The exterior body 11 is formed in a thin rectangular parallelepiped shape, and includes a bottom plate portion 21 that constitutes a bottom surface of the exterior body 11, a front wall portion 22 that constitutes a front surface, and a rear wall portion 23 that constitutes a rear surface (FIG. 2). And left and right side wall parts (left wall part, right wall part) 24 constituting the left and right side surfaces and an upper plate part 25 constituting the upper surface.
The front wall portion 22 and the rear wall portion 23 are surfaces having the same shape and are arranged in parallel to each other, and form the largest surface in the exterior body 11. The front wall portion 22 is provided with an opening 22K (see FIG. 3 described later) to which the air electrode 13 is attached (adhered).

The air electrode 13 is made of a rectangular (excluding the tab portion 13T) copper mesh (copper wire mesh) mixed with carbon and Teflon (registered trademark) using a roller press or the like to form a sheet with a predetermined thickness. After that, the sheet that has been dried and fired at a predetermined temperature for a predetermined time and pressed to hold the sheet cut into approximately the same size as the copper mesh from both sides is attached to the opening 22K of the exterior body 11 with an adhesive or the like. It is a bonded structure and has air permeability and water impermeability. That is, in the sheet-shaped material, external air can be passed through the exterior body, and the electrolyte inside the exterior body 11 is water-impermeable. A wide variety of known configurations can be applied to the air electrode 13.
The magnesium electrode 15 is disposed between the front wall portion 22 and the rear wall portion 23 and in parallel with the air electrode 13 at a position separated from the wall portions 22 and 23. The air electrode 13 and the magnesium electrode 15 are also parallel to the front wall portion 22 and the rear wall portion 23. In the battery use state shown in FIG. 1, the electrode plates 13 and 15 are arranged in the vertical direction.

The air electrode 13 is provided with a tab portion 13T protruding upward, and a positive electrode wiring (not shown) is connected to the tab portion 13T. As the tab portion 13T, a copper plate member is used and joined to the copper mesh of the air electrode 13 by welding or the like. The tab portion 13T protrudes upward from the upper plate portion 25 of the exterior body 11, and the positive electrode wiring can be easily connected from above.
The magnesium electrode 15 is also provided with a tab portion 15T protruding upward, and a negative electrode wiring (not shown) is connected to the tab portion 15T.

The tab portion 15 </ b> T of the magnesium electrode 15 is provided integrally with the magnesium electrode 15 and projects upward from the exterior body 11. That is, the magnesium electrode 15 includes a rectangular plate-shaped magnesium electrode body part (metal electrode body part) 15A (see FIG. 4 described later) and a tab part 15T protruding upward from the magnesium electrode body part 15A with the same thickness. It is prepared as one.
As shown in FIG. 1, the tab portion 15 </ b> T of the magnesium electrode 15 is provided offset to one end side (left end side) in the width direction of the magnesium electrode 15. Further, the tab portion 13T of the air electrode 13 is provided at a position offset from the tab portion 15T of the magnesium electrode 15 to the other end in the width direction (right end side in FIG. 1). Accordingly, the tab portions 15T and 13T are arranged so as not to overlap each other when viewed from the front (FIG. 1).

  The upper plate part 25 functions as a covering member that covers the upper part of the internal space formed between the front wall part 22, the rear wall part 23, and the left and right side wall parts 24. The upper plate portion 25 covers the upper surface of the magnesium electrode main body portion 15A, while the tab portion 15T is exposed to the outside. Further, the upper plate portion 25 is provided with a pair of left and right hole portions 25H serving as injection ports for an electrolytic solution (in this configuration, saline). Each hole 25H corresponds to the inner peripheral portion of the cut along the arc, and each hole 25H is opened when the tip of the injection bottle for injecting the electrolyte is abutted on the inside of the cut so that the electrolyte is contained inside. Can be injected. At this time, the electrolytic solution is injected from any one of the holes, and the other holes become air holes. The pair of left and right holes 25H serving as the electrolyte inlet may be more than two, and the shape of the holes 25H is not limited to a circular arc but is particularly limited to a triangular shape or a quadrangular shape. is not. In the case where a plurality of holes 25H are provided, it is sufficient that at least one hole is configured as an air hole. For example, when three holes 25H are provided, two are liquid injection ports and one is air. By making the holes, the injection time can be shortened.

In this configuration, since the plurality of holes 25H are provided as described above, when the electrolyte is injected from one side, the other can function as an air hole that draws the air in the exterior body 11 to the outside. . Moreover, compared with the case where the single hole portion 25H is provided, the gas generated inside during the battery reaction can be efficiently extracted to the outside. In other words, one of the holes 25H functions as an electrolyte injection port and the other functions as an air hole and a vent hole.
As described above, since the hole portion 25H that is selectively opened by the cut is provided, it can be kept closed before the battery is used, and foreign matter such as dust can be prevented from entering.

Furthermore, the exterior body 11 of this configuration can support the magnesium electrode 15 with a simple configuration, and is advantageously configured to ensure the amount of electrolyte and reduce the weight.
First, the exterior body 11 is made of a sheet material containing paper. More specifically, a sheet of which both sides are laminated with a heat-fusible resin (for example, polyethylene (PE)), that is, a laminated paper (also referred to as a double-sided laminated paper) is used for the sheet material. For this reason, the electrolytic solution does not ooze out (leak), and is lighter and cheaper than when a metal can or a resin container is used.

In addition, the sheet material containing paper in this configuration is a composite of paper and a heat-fusible resin by lamination processing or the like. The ratio of the paper in the sheet material is preferably more than 50%. The exterior body 11 of this configuration can be discarded as, for example, paper waste by setting the paper ratio to exceed 50%.
As will be described later, the exterior body 11 is made of a punched sheet 100 obtained by punching a sheet material into a predetermined shape. The punched sheet 100 satisfies the strength required for the exterior body 11 after assembly due to the so-called stiffness of paper (corresponding to the strength of paper). In other words, it is manufactured to have a desired strength by adjusting the thickness of the punched sheet 100, the length of the paper fiber to be contained, the material of the paper fiber, and the like. Further, the paper can be held in a bent state by adjusting the stiffness of the paper, and the strength necessary for holding the magnesium electrode 15 by a pair of front and rear upper plate component pieces 25F and 25R described later is also obtained.

More specifically, as the paper, a paper having a relatively thick strength such as a coated ball, an uncoated ball, a paperboard, or a cardboard can be suitably used. In addition, a cup base paper, a paper pack base paper, or the like in which paper and a heat-fusible resin are combined in advance can be suitably used.
In addition, as the heat-sealable resin, it is possible to form a liquid-tight box shape by joining the sheet material by heat-seal, and any resin can be used as long as it can be heat-sealable. Although possible, it is preferable to use a polyolefin resin such as polyethylene, polypropylene, and ethylene-vinyl acetate copolymer. The thickness of the heat-fusible resin is at least 10 μm, preferably 20 μm or more in order to obtain a sufficient heat-sealed state. In particular, it is more preferable that the surface on the inner surface side of the exterior body has a thickness of 40 μm or more in order to ensure sealing performance.

  Moreover, as a sheet | seat material, another film etc. can be laminated | stacked further as needed. For example, a polyethylene terephthalate (PET), polyamide (Ny), or stretched polypropylene (OPP) film can be laminated for the purpose of imparting strength to the sheet material. A polyamide film is a film excellent in puncture resistance, and is preferably used. Moreover, these films can give the printing property excellent in the sheet material by laminating | stacking on the outer surface side of a sheet material. In other words, when printing a pattern or text on a sheet material, it may be printed directly on the paper, but by printing on PET or OPP in advance and laminating this on the paper, a beautiful pattern is printed on the sheet material. Or characters can be added.

The sheet material including the paper of the present invention needs to have a predetermined strength. Specifically, stiffness (Taber) (JIS-P 8125 "Paper and board-stiffness test method-" compliant) "is 5 in MD direction (paper direction parallel to paper machine traveling direction; MD = machine direction). ˜30 mN · m, preferably 2 to 15 mN · m in the CD direction (the direction of the paper perpendicular to the traveling direction of the paper machine; CD = cross direction). Stiffness (Taber) can be adjusted by changing the thickness and density of paper, the type and thickness of heat-sealable resin and other films to be laminated.
In addition, when stiffness (Taber) is smaller than the said value, intensity | strength is insufficient and it is difficult to maintain the shape as a battery exterior body. Moreover, when larger than the said value, intensity | strength is too strong and operations, such as a bending process, become difficult.

For the lamination of the above-mentioned paper and the heat-fusible resin, a method of extruding and laminating the heat-fusible resin onto the paper is simple and preferable, but other known lamination methods such as a dry laminating method using an adhesive for dry laminating are preferable. A method can also be adopted. As for the lamination of PET, Ny, and OPP, a known lamination method can be adopted, and a dry lamination method using an adhesive or a sand lamination method using a heat-fusible resin is generally used.
Specific examples of the layer structure of the sheet material are shown below.
(1) PE / paper / PE
(2) PE / paper / PE / (PE / Ny / PE) Note: () is co-extruded film (3) PET / PE / paper / PE

  When the exterior body 11 is manufactured, the punched sheet 100 is formed by punching the sheet material into a predetermined shape, and the punched sheet 100 is bent. Under the present circumstances, it is preferable to perform the end surface process for preventing the penetration | invasion to the sheet | seat material of electrolyte solution about the part which may touch the electrolyte solution mentioned later among the cut | disconnected end surfaces. As the end surface treatment, a method of covering the end surface by applying hot melt or adhesive to the end surface, a method of attaching a separate film, or the like can be employed.

FIG. 3 is a developed view of the exterior body 11 of the first embodiment (a figure corresponding to the punched sheet 100). In FIG. 3, the fold lines are indicated by alternate long and short dash lines for easy understanding. 4 is a sectional view taken along the line IV-IV in FIG. 1, and FIG. 5 is a sectional view taken along the line VV in FIG.
As shown in FIG. 3, the punched sheet 100 includes a rectangular bottom plate portion 21, a rectangular front wall portion 22 continuous with a front edge 21 </ b> A (corresponding to a fold) of the bottom plate portion 21, and a rear edge 21 </ b> B (fold line) of the bottom plate portion 21. And a rectangular rear wall portion 23 connected to each other. By folding the front wall portion 22 and the rear wall portion 23 on the basis of the front edge 21A and the rear edge 21B of the bottom plate portion 21, as shown in FIGS. 22 and the rear wall part 23 stand upright. As shown in FIG. 3, the front wall portion 22 is formed with an opening 22 </ b> K to which the air electrode 13 is attached. The opening 22 </ b> K is punched at the same time as the punched sheet 100 is formed by punching, for example. It is.

  The bottom plate portion 21 is bent with reference to a fold line 21C (FIG. 3) that divides the bottom plate portion into two front and rear (this configuration is equally divided). As shown in FIGS. It is formed in a letter shape. A magnesium electrode 15 is placed on the bottom plate portion 21. As a result, the lower end of the magnesium electrode 15 is guided by the inclination of the bottom plate portion 21 and fitted into the downwardly convex portion 21T, and the lower end of the magnesium electrode 15 can be easily positioned. Further, it is possible to keep the separation distance between the magnesium electrode 15 and the air electrode 13 appropriately by the downward convex portion 21T and the first bent portions 25F1 and 25R1 described later, and the separation distance of the folds 21C, 22C, and 23C. It can be easily adjusted by changing the distance.

As shown in FIG. 3, the punched sheet 100 includes a pair of left and right side wall constituent pieces 24 </ b> F continuous to the left and right side edges 22 </ b> S (corresponding to a fold) of the front wall part 22, and the left and right side edges 23 </ b> S of the rear wall part 23. It has a pair of left and right side wall component pieces 24R that are continuous with (corresponding to the crease). The left and right side wall portions 24 are formed by these side wall portion constituting pieces 24F and 24R.
More specifically, each of the side wall portion constituting pieces 24F, 24R is formed in a vertically long rectangular shape extending over the front wall portion 22 and the rear wall portion 23, and the front wall portion 22 and the rear wall portion 23 The left and right side edges 22S and 23S are bent inward (corresponding to the inside of the exterior body 11). Further, the side wall portion constituting pieces 24F and 24R are bent outward (outside the exterior body 11) with reference to the creases 24C and 24D that divide the constituting pieces 24F and 24R into left and right parts (this part is equally divided). The outer bent pieces 24FS and 24RS bent outward are joined together by heat sealing. After being joined, the outer bent pieces 24FS and 24RS are bent so as to be in close contact with the inner bent pieces 24FU and 24RU bent inward, whereby the side wall portion 24 is formed.
In this case, the outer bent pieces 24FS and 24RS may be joined to the inner bent pieces 24FU and 24RU by heat sealing, or the outer bent pieces 24FS and 24RS may be joined to the inner bent pieces 24FU, using an adhesive material such as a tape. You may make it closely_contact | adhere to 24RU. Thus, the bottom plate portion 21, the front wall portion 22, the rear wall portion 23, and the left and right side wall portions 24 are assembled.

Further, as shown in FIG. 3, the punched sheet 100 includes an upper plate part constituting piece 25 </ b> F continuous to the upper edge 22 </ b> A (corresponding to the fold) of the front wall part 22, and an upper edge 23 </ b> A (corresponding to the fold) ) And the upper plate part constituting piece 25R. Then, the upper plate portion 25 is formed by the pair of upper plate portion constituting pieces 25F and 25R.
More specifically, each of the upper plate portion constituting pieces 25F and 25R is formed in a horizontally long rectangular shape (plate shape extending in the width direction) extending over the entire width of the front wall portion 22 and the rear wall portion 23. . 4 and 5, the upper plate portion constituting pieces 25F and 25R are arranged on the inner side (the inner side of the exterior body 11) with reference to the upper edges 22A and 23A of the front wall portion 22 and the rear wall portion 23, as shown in FIGS. 3), and is further folded inward (inside the exterior body 11) with reference to the fold lines 22C and 23C (FIG. 3) that divide the constituent pieces 25F and 25R into two parts in the vertical direction. , FIG. 5) bends in a substantially L shape.

  As shown in FIGS. 4 and 5, the upper plate component pieces 25 </ b> F and 25 </ b> R are first bent portions 25 </ b> F <b> 1 and 25 </ b> R <b> 1 that are bent from both the front wall portion 22 and the rear wall portion 23 toward the magnesium electrode 15. And second bent portions 25F2 and 25R2 which are bent from the tips of the first bent portions 25F1 and 25R1 (corresponding to the folds 22C and 23C) and contact the magnesium electrode 15, and the upper portion of the magnesium electrode 15 is supported by these. Is done.

  More specifically, the upper plate portion constituting piece 25R of the rear wall portion 23 has cut lines K (see FIG. 3) at positions corresponding to both side edges of the tab portion 15T of the magnesium electrode 15 in the width direction of the magnesium electrode 15. Thus, the tab portion 15T is divided into a tab portion-side divided portion 25X and a non-tab portion-side divided portion 25Y with reference to the boundary between the tab portion 15T and the non-tab portion without the tab portion 15T. And in the division part 25X by the side of a tab part, as shown in FIG. 4, 1st bending part 25R1 is formed in the length extended from the rear wall part 23 to the rear surface MR of the magnesium pole 15, and 2nd bending part 25R2 is formed. By being bent downward, it contacts the rear surface MR of the magnesium electrode 15. Thus, the upper plate component piece 25R bridges between the rear surface MR of the magnesium electrode 15 and the rear wall portion 23, and the upper plate component piece 25R moves to the rear wall portion 23 side of the magnesium electrode 15 (air electrode). 13) is restricted.

  Further, in the divided portion 25Y on the non-tab portion side, as shown in FIG. 5, the first bent portion 25R1 gets over the magnesium pole main body portion 15A, and the second bent portion 25R2 comes into contact with the front surface MF of the magnesium pole 15. Can be folded. As a result, the upper plate portion constituting piece 25R bridges between the front surface MF of the magnesium electrode 15 and the rear wall portion 23, and the upper plate portion constituting piece 25R moves to the front wall portion 22 side of the magnesium electrode 15 (air electrode). 13 movement) is restricted. In this way, the upper plate component piece 25 </ b> R of the rear wall portion 23 restricts the movement of the magnesium electrode 15 both forward and backward.

On the other hand, in the upper plate portion constituting piece 25F of the front wall portion 22, as shown in FIGS. 4 and 5, the first bent portion 25F1 is formed with a length extending from the front wall portion 22 to the front surface MF of the magnesium electrode 15. The Then, when the second bent portion 25F2 is bent downward, the second bent portion 25F2 contacts the front surface MF of the magnesium electrode 15 via the second bent portion 25R2 of the upper plate component piece 25F of the rear wall portion 23. As a result, the front surface MF of the magnesium electrode 15 and the front wall portion 22 are bridged, and the upper plate component piece 25F moves the magnesium electrode 15 toward the front wall portion 22 (movement toward the air electrode 13). Be regulated.
In this manner, both the upper plate portion constituting pieces 25F and 25R of the front wall portion 22 and the rear wall portion 23 function as supporting bent portions that support the magnesium electrode 15 by bending a part of the sheet material.

Next, the assembly procedure of the magnesium air battery 10 will be described.
First, a punched sheet 100 made of a sheet material containing paper is prepared. Then, the punched sheet 100 is folded in half with respect to the front edge 21A and the rear edge 21B of the bottom plate portion 21 so that the front wall portion 22 and the rear wall portion 23 are erected, and the front wall portion 22 and the rear wall portion 23 are erected. The left and right side wall portion constituting pieces 24F and 24R are bent and joined by thermal fusion to form the left and right side wall portions 24 (first assembly step). Thereby, the exterior body 11 is assembled in a state where the internal space is opened upward. In the first assembly step, the bottom plate portion 21 is bent into a downwardly convex V-shape when viewed from the side (see FIGS. 4 and 5).
Next, the magnesium electrode 15 is inserted into the exterior body 11 from above, the lower end of the magnesium electrode 15 is abutted against the downwardly convex portion 21T (FIGS. 4 and 5) of the bottom plate portion 21, and the lower end of the magnesium electrode 15 is positioned. (Second assembly step).

Subsequently, as illustrated in FIGS. 4 and 5, the upper plate component piece 25 </ b> R connected to the rear wall portion 23 is bent toward the magnesium electrode 15 to form the first bent portion 25 </ b> R <b> 1 and the first bent portion 25 </ b> R <b> 1. Is bent downward at a crease 23C (FIG. 3) corresponding to the tip of the first to form a second bent portion 25R2 in contact with the magnesium electrode 15 (third assembly step).
At this time, of the upper plate portion constituting piece 25R of the rear wall portion 23, the divided portion 25X on the tab portion side is bent downward on the rear surface MR side of the magnesium electrode 15 as shown in FIG. It contacts and regulates the movement of the magnesium electrode 15 toward the rear wall 23. Further, as shown in FIG. 5, the non-tab portion-side divided portion 25 </ b> Y crosses the magnesium electrode main body portion 15 </ b> A, is bent downward on the front surface MF side of the magnesium electrode 15, and contacts the front surface MF. The movement to the front wall portion 22 side is restricted.

Thereafter, as shown in FIGS. 4 and 5, the upper plate portion constituting piece 25 </ b> F connected to the front wall portion 22 is bent toward the magnesium electrode 15 to form the first bent portion 25 </ b> F <b> 1 and the first bent portion 25 </ b> F <b> 1. A second fold portion 25F2 is formed by bending downward at a fold line 22C (FIG. 3) corresponding to the tip (fourth assembly step). Since the second bent portion 25F2 bridges the front surface MF of the magnesium electrode 15 and the front wall portion 22, the movement of the magnesium electrode 15 to the front wall portion 22 side (movement to the air electrode 13 side) is restricted. To do.
In this manner, the magnesium electrode 15 can be positioned by supporting the magnesium electrode 15 from the front and back by the pair of front and rear upper plate component pieces 25F and 25R, and the displacement of the magnesium electrode 15 can be prevented.

  The exterior body 11 is sealed by heat fusion, and a pair of upper and lower upper plate component pieces 25F and 25R is a member (not shown) that joins the upper plate component pieces 25F and 25R from above. Are attached to each other by attaching a member or a sticking material such as a tape). Further, the air electrode 13 may be attached to the exterior body 11 before the first assembly process, or attached (adhered) after the exterior body 11 is assembled (for example, after the fourth assembly process). May be. Thus, the magnesium-air battery 10 is assembled, and the electrolytic solution is injected into the outer package 11 when used as a battery.

Next, the assembled magnesium air battery 10 will be described.
As shown in FIGS. 4 and 5, the magnesium-air battery 10 is configured such that the exterior body 11 made of a sheet material containing paper covers the magnesium electrode 15 with gaps SF and SR between the front and rear, and the gap SF. , SR is covered from above, and a pair of front and rear upper plate component pieces 25F, 25R is bent so as to cross the gaps SF, SR.
For this reason, while being able to ensure the quantity of the electrolyte solution in the exterior body 11 fully, the magnesium electrode 15 can be hold | maintained in the position spaced apart from the air electrode 13 by simple structure. And since the exterior body 11 is formed from the sheet | seat material containing paper, the weight reduction of the exterior body 11 and reduction of processing cost are also possible.
Furthermore, since the main parts constituting the magnesium-air battery 10 are three parts, that is, the exterior body 11, the magnesium electrode 15, and the air electrode 13 (including the tab portion 13T), the number of parts is small, the assembly man-hour is reduced, and the magnesium air The overall weight of the battery 10 can be reduced.

Further, since the upper portion of the magnesium electrode 15 is supported by the pair of upper and lower upper plate portion constituting pieces 25F and 25R and the lower end thereof is positioned by the downward projecting portion 21T of the bottom plate portion 21, the supporting force of the magnesium electrode 15 is increased. It is possible to improve and effectively suppress misalignment.
In addition, since a gap SR in which the electrolytic solution enters is provided on the opposite side to the air electrode 13 with respect to the magnesium electrode 15, a product (Mg in this configuration) generated between the magnesium electrode 15 and the air electrode 13 by a discharge reaction. (OH) ₂ : Magnesium hydroxide) is gradually pushed out from the gap SF between the air electrode 13 and the magnesium electrode 15 to the side opposite to the air electrode 13, and the electrolyte solution on the side opposite to the air electrode becomes magnesium and air electrode Therefore, the discharge reaction can be easily continued.

In FIG. 4 and FIG. 5, the symbol UL indicates the liquid level of the electrolytic solution.
The pair of front and rear upper plate component pieces 25F and 25R are positioned above the electrolyte surface UL, and the first bent portions 25F1 and 25R1 of the upper plate component pieces 25F and 25R face the magnesium electrode 15. And slanted downward. For this reason, when the electrolytic solution scatters upward due to the generation of hydrogen by the discharge reaction, the electrolytic solution flows along the lower surface of the first bent portions 25F1 and 25R1, and quickly and smoothly into the electrolytic solution stored below. Can be returned.
Further, the first bent portions 25F1 and 25R1 of the upper plate component pieces 25F and 25R are abutted against each other. For this reason, the first bent portions 25F1 and 25R1 are stretched between the front wall portion 22 and the rear wall portion 23, and the front wall portion 22 and the rear wall portion 23 are separated from each other and are easily held parallel to each other. In addition, since the upper surfaces of the first bent portions 25F1 and 25R1 are continuous, the first bent portions 25F1 and 25R1 are easily connected to each other by an adhesive material such as a tape.

As described above, in the present embodiment, the exterior body 11 of the magnesium-air battery 10 is formed of a sheet material containing paper, and this sheet material is provided with a gap SF, SR and a magnesium electrode (metal electrode). 15, a part of the sheet material is folded to cross the gaps SF and SR, and a pair of upper plate part constituting pieces 25 </ b> F and 25 </ b> R functioning as supporting bent parts for supporting the magnesium electrode 15 are integrally provided. It is possible to support the magnesium electrode 15 with a simple configuration such as bending a part of the exterior body 11 formed of a sheet material containing, and it is advantageous for securing the amount of electrolyte and reducing the weight. In addition, a high weight energy density can be obtained by reducing the weight of the outer package 11.
Furthermore, since a dedicated part for supporting the magnesium electrode 15 is not necessary, the number of parts can be reduced, and it is easy to add a configuration of power generation elements other than the magnesium electrode 15. Therefore, it is easy to reduce the cost and the degree of freedom in changing the configuration is high.

Moreover, since the pair of upper plate portion constituting pieces 25F and 25R holds the magnesium electrode 15 at a position separated from the air electrode 13, the magnesium electrode 15 and the air electrode 13 can be reliably separated. For this reason, electrolyte solution can fully be hold | maintained between poles. Moreover, it becomes easy to maintain the distance (separation distance) between the magnesium electrode 15 and the air electrode 13 appropriately.
Further, each of the upper plate component pieces 25F and 25R has a wall portion (front wall portion 22) on the air electrode 13 side and a side opposite to the air electrode 13 with respect to the magnesium electrode 15 in the sheet material (punched sheet 100). First bent portions 25F1 and 25R1 that are bent from the wall portion (rear wall portion 23) toward the magnesium electrode 15, and a second bent portion that is bent from the tips of the first bent portions 25F1 and 25R1 and contacts the magnesium electrode 15 poles. Since the portions 25F2 and 25R2 are provided, the magnesium electrode 15 can be supported with a simple bent structure.

Further, the first bent portions 25F1 and 25R1 are provided above the electrolyte level UL of the electrolyte in the exterior body 11 and are inclined obliquely downward toward the magnesium electrode 15, so that the first bent portions 25F1 and 25R1 It is difficult for the electrolytic solution to go out, and the electrolytic solution attached to the lower surfaces of the first bent portions 25F1 and 25R1 can be efficiently returned.
Further, the upper plate component piece 25R connected to the rear wall portion 23 is divided in the width direction of the magnesium electrode 15 with reference to the boundary between the tab portion 15T and the non-tab portion without the tab portion 15T. One of the divided portion 25X (FIG. 3) and the non-tab portion-side divided portion 25Y (FIG. 3) regulates the movement of the magnesium electrode 15 toward the air electrode 13, and the other is the air electrode of the magnesium electrode 15. 13 to the opposite side, so that the tab 15T is avoided and the divided portions 25X and 25Y of the upper plate component piece 25R connected to the rear wall 23 are used to move the magnesium electrode 15 to the air electrode 13 side. Both movement and movement to the opposite side can be restricted.

Moreover, since the exterior body 11 has the baseplate part 21 bent by the downward convex shape in which the lower end of the magnesium electrode 15 fits, the lower end of the magnesium electrode 15 can be positioned with a simple bending structure, and a shift | offset | difference can be prevented.
In addition, since the sheet material used for the exterior body 11 is a paper that is combined with a heat-fusible resin by laminating or the like, for example, by making the ratio of paper over 50%, It is easy to separate and dispose of it as paper waste, and it is easy to get it easily. Accordingly, it is possible to provide a magnesium-air battery that is low in cost and light in weight and excellent in discardability.

(Second Embodiment)
FIG. 6 is a perspective view of the exterior body 11 of the second embodiment, and FIG. 7 is a developed view of the exterior body 11 of the second embodiment (= a figure corresponding to the punched sheet 100). In the following description, the same components as those described above are denoted by the same reference numerals, and a duplicate description is omitted, and different parts are described in detail.
In the exterior body 11, the upper plate portion constituting piece 25 </ b> F connected to the upper edge 22 </ b> A (FIG. 7) of the front wall portion 22 is formed longer in the vertical direction than the upper plate portion constituting piece 25 </ b> F (FIG. 3) of the first embodiment. Has been. The upper plate component piece 25F is composed of a first bent portion 25F1, a second bent portion 25F2, and a second bent portion in order from the front wall portion 22 side with reference to the fold lines 22C and 22D (FIG. 7) that are divided into three parts. A three-folded portion 25F3 is provided.

  Further, the upper plate component piece 25R connected to the upper edge 23A (FIG. 7) of the rear wall portion 23 is also formed longer than the upper plate component piece 25R (FIG. 3) of the first embodiment, and vertically. A first bent portion 25R1, a second bent portion 25R2, and a third bent portion 25R3 are provided in order from the rear wall 23 side with reference to the fold lines 23C and 23D (FIG. 7) to be divided into three.

FIG. 8A is a view of the exterior body 11 of the second embodiment as viewed from the front, and FIG. 8B is a view showing a cross section AA of FIG. 8A.
As shown in FIGS. 8A and 8B, the second bent portions 25F2 and 25R2 are bent inside the outer package 11, and the third bent portions 25F3 and 25R3 are bent outward of the outer package 11, respectively.
In this case, since the third bent portions 25F3 and 25R3 are formed longer in the vertical direction than the second bent portions 25F2 and 25R2, the tips of the third bent portions 25F3 and 25R3 are more than the second bent portions 25F2 and 25R2. It protrudes upward and the third bent portions 25F3 and 25R3 come into contact with each other.

That is, the upper plate portion constituting pieces 25F and 25R are folded inside the exterior body 11 along the magnesium electrode 15, and are folded back to the opposite side so as to protrude outside the exterior body 11 from the magnesium electrode 15. 2 bent portions 25F2 and 25R2, and third bent portions 25F3 and 25R3).
Then, as shown in FIG. 8B, the upper part of the magnesium electrode 15 is sandwiched between the lower parts of the pair of front and rear folded parts (between the lower parts of the third bent parts 25F3 and 25R3) so as to maintain the state. In addition, the folded portions protruding to the outside of the exterior body 11 are joined to each other by heat fusion.
Accordingly, the magnesium electrode 15 can be sandwiched between the lower portions of the folded portions, and the upper plate portion constituting pieces 25F and 25R, that is, the upper portion of the outer package 11 can be sealed. Therefore, both the upper plate component pieces 25 </ b> F and 25 </ b> R function as supporting bent portions that support the magnesium electrode 15, and also function as sealing portions that seal the upper portion of the exterior body 11.

According to this configuration, as compared with the folding type shown in FIG. 4 and the like of the first embodiment, it is possible to secure the upper sealing and suppress the evaporation and leakage of the electrolyte.
Moreover, as shown in FIG. 5, since the upper-plate part component pieces 25F and 25R are not divided into right and left, it becomes difficult to wrinkle when folded. Further, since the inner plate 25 is folded back to the outside and then folded outward, the rigidity of the upper plate component pieces 25F and 25R itself can be improved, wrinkles and deformation can be prevented, the rigidity of the exterior body 11 and the support force of the magnesium electrode 15 can be improved. Is possible.
In the present embodiment, the tab portion 15T (see FIG. 1) protruding upward is not formed on the magnesium electrode 15, and instead, a wiring 15H (FIG. 12 described later) is connected to the upper portion of the magnesium electrode 15. It has become.

Further, as shown in FIG. 7, sheet pieces 26 </ b> F are integrally provided on the left and right sides of the first bent portion 25 </ b> F <b> 1 that is bent at the upper edge 22 </ b> A of the front wall portion 22 and covers the upper portion of the magnesium electrode 15. ing. As shown in FIG. 6, these sheet pieces 26F are bent downward (along the inner bent pieces 24FU) with respect to the left and right side edges of the first bent portion 25F1, and then the outer bent pieces 24FS of the side wall portion constituting pieces 24F. Then, the vertically folded sheet piece 26F is sandwiched by a heat-sealing machine and joined by heat-sealing.
Thus, by fixing the upper ends of the exterior body 11 with the sheet pieces 26F, the upper portions of the bent pieces 24FU and 24FS can be reinforced.
According to this configuration, the gap between the first bent portion 25F1 serving as the lid portion and the side wall portion constituting piece 24F serving as the sidewall portion can be sealed by the sheet piece 26F, thereby suppressing the evaporation and leakage of the electrolyte. can do. Moreover, the connection strength of the 1st bending part 25F1 and the side wall part component piece 24F improves, and the expansion to the upper direction of the 1st bending part 25F1 and the side wall part component piece 24F can be suppressed.

In the present embodiment, similarly to the front wall portion 22, the left and right sides of the first bent portion 25 </ b> R <b> 1 that is bent at the upper edge 23 </ b> A of the rear wall portion 23 and covers the upper side of the magnesium electrode 15 are also described above. A sheet piece 26R similar to the sheet piece 26F is integrally provided (see FIG. 7). As shown in FIG. 6, these sheet pieces 26R are bent downward (along the inner bent piece 24RU) with respect to the left and right side edges of the first bent portion 25R1, and then the outer bent piece 24RS of the side wall portion constituting piece 24R. Then, the vertically folded sheet piece 26R is sandwiched by a heat-sealing machine and joined by heat-sealing.
Thus, by fixing the upper ends of the exterior body 11 with the sheet pieces 26R, the upper portions of the bent pieces 24RU and 24RS can be reinforced.
Thus, the space between the first bent portion 25R1 serving as the lid portion and the side wall portion constituting piece 24R serving as the side wall portion can be sealed, and evaporation and leakage of the electrolyte can be suppressed, and the first bent portion 25R1 and the side wall portion can be suppressed. The connection strength with the component piece 24R is improved, and the first bent portion 25R1 can be prevented from spreading upward and the side wall portion component piece 24R can be prevented from spreading in the left-right direction.
In addition, since the heat fusion between the sheet piece 26F and the sheet piece 26R bent vertically can be uniformly applied with heat, it is only necessary to carry out heat fusion once.

Thus, the sheet pieces 26F and 26R can further suppress the evaporation and leakage of the electrolytic solution, and can further prevent deformation of the exterior body 11.
In this configuration, when the cutout 28 (see FIG. 7) is provided in advance between the left and right sheet pieces 26F, 26R and the upper plate part constituting pieces 25F, 25R, and the exterior body 11 is assembled, FIG. As shown, a space 28K is secured between the sheet pieces 26F and 26R and the upper plate portion constituting pieces 25F and 25R through which the wiring 15H from the magnesium electrode 15 (FIG. 12 to be described later) can pass.

  As described above, in the present embodiment, as shown in FIG. 8B, the upper plate component pieces 25F and 25R (supporting bent portions) are separated from the front wall portion 22 and the rear wall portion 23 by magnesium. The inner electrode body 11 is bent along the poles 15 and has a folded portion that is folded back to the outside of the outer casing body 11 from the magnesium electrode 15. The magnesium electrode 15 is sandwiched between the lower portions of the folded portions. At the same time, since the remaining projecting portions of the exterior body 11 are joined to each other to seal the space between the upper plate component pieces 25F and 25R, the evaporation and leakage of the electrolyte are suppressed and deformation of the exterior body 11 is prevented. In addition, it is possible to keep the separation distance between the magnesium electrode 15 and the air electrode 13 appropriately by suppressing the displacement of the magnesium electrode 15.

  In addition, since a part of the upper plate component pieces 25F and 25R protrudes upward, it can be used as a grip when carrying the exterior body 11. In addition, since each part of the upper plate component pieces 25F and 25R is joined by fusion, it can be easily joined by making use of the thermal fusion property of the sheet material laminated with the thermal fusion resin. it can.

  Moreover, since it is provided with the sheet pieces 26F and 26R (FIG. 6) joined to the side wall part constituting pieces 24F and 24R constituting the side wall parts connected to the upper plate part constituting pieces 25F and 25R constituting the lid part, a simple structure is provided. Therefore, it is possible to seal the space between the upper plate component pieces 25F and 25R and the side wall component pieces 24F and 24R, thereby suppressing evaporation and leakage of the electrolyte. In addition, the connection strength between the upper plate portion constituting pieces 25F and 25R and the side wall portion constituting pieces 24F and 24R is improved, and the deformation of the exterior body 11 can be further prevented.

The upper plate component pieces 25F and 25R are not limited to the above shapes. For example, as shown in FIGS. 9A and 9B, the upper plate portion 25 may be lengthened to change the third bent portions 25F3 and 25R3 into the shape of the handle so as to make it easier to grip.
In FIG. 9A, the third bent portions 25F3, 25R3 are enlarged in the vertical direction, and long holes 29 extending in the left-right direction are provided. The aspect which formed one handle which is easy to grasp is shown. Further, each long hole 29 of one third bent portion 25R3 is provided with a bent portion 29A that is bent toward each long hole 29 of the other third bent portion 25F3. You can also ease the finger contact.
In addition, FIG. 9B is a mode in which two handles are formed by providing notches 30 that divide each of the third bent portions 25F3 and 25R3 into left and right. By providing this notch 30, it is possible to avoid interference with internal members.

(Third embodiment)
FIG. 10A is a front view of the exterior body 11 of the third embodiment. FIG. 10B is a view showing a BB cross section of FIG.
The exterior body 11 is provided with a pair of left and right bottom plate sheet portions 35 into which the lower end of the magnesium electrode 15 is fitted. These bottom plate sheet portions 35 are made of a sheet material that is the same as the sheet material constituting the exterior body 11, that is, a sheet material that is a composite of paper and a heat-fusible resin by lamination, etc. It is formed by bending into a full downward convex shape.

FIG. 11 is a perspective view of the bottom plate sheet portion 35 of the third embodiment.
The bottom plate sheet portion 35 includes a pair of front and rear end portions 35AF and 35AR joined to lower portions of both ends of the front wall portion 22 and the rear wall portion 23, and substantially horizontal from the lower ends of the end portions 35AF and 35AR toward the inside. A pair of front and rear first bent portions 35B (35BF, 35BR), a pair of front and rear second bent portions 35C bent downward from one end of each first bent portion 35B, and a second bent portion 35C (35CF, 35CR) is integrally provided with a bridging portion 35D that connects between the lower ends.
The interval between the second bent portions 35 </ b> C is formed to have almost the same length as the plate thickness of the magnesium electrode 15. Thereby, as shown in FIG. 10B, the lower end of the magnesium electrode 15 is held by disposing the magnesium electrode 15 between the second bent portions 35C.

The bottom plate sheet portion 35 is obtained by thermally bonding the end portions 35AF and 35AR to the sheet material so as to straddle the bottom plate portion 21 of the exterior body 11 in a state where the sheet material forming the exterior body 11 is developed in a planar shape. Be joined. Then, when the exterior body 11 is formed by bending the sheet material into a concave shape opening upward, the first folded portion 35A and the second folded portion 35B stand up inside the exterior body 11 so as to be separated from the bottom plate portion 21. The bottom plate sheet portion 35 is formed.
In other words, the sheet length between the end portions 35AF and 35AR in the bottom plate sheet portion 35 (the sheet length including the pair of first bent portions 35B, the pair of second bent portions 35C, and the bridging portion 35D) is the bottom plate of the exterior body 11. It is formed equal to the distance between the joint portions with the sheet portion 35 (the distance indicated by the symbol LX in FIG. 10B), and each portion 35B to 35D is fold-folded or mountain-folded so that it can be folded in the direction shown in the figure. Is provided in advance.

Thereby, in the state which the sheet | seat material of the exterior body 11 was expand | deployed, the baseplate sheet | seat part 35 expand | deployed planarly can be joined easily, and the sheet | seat material of the exterior body 11 is made concave so that the baseplate part 21 may be formed after that. If it bends, the standing part which consists of the 1st bending part 35B and the 2nd bending part 35C of the baseplate sheet part 35 will stand up so that it may space apart from the baseplate part 21, and the baseplate sheet part 35 can be assembled easily.
By providing the bottom plate sheet portion 35, the positional deviation between the front and rear of the magnesium electrode 15 is suppressed, and the distance (separation distance) between the magnesium electrode 15 and the air electrode 13 can be easily maintained. Moreover, the effect that it becomes possible to suppress the damage of the exterior body 11 by the magnesium electrode 15 is also acquired.
Further, the bridging portion 35 </ b> D of the bottom plate sheet portion 35 is positioned on the bottom plate portion 21 by fitting into the downwardly projecting portion 21 </ b> T of the bottom plate portion 21, thereby making it easy to suppress the displacement of the magnesium electrode 15.

In the present embodiment, the bridging portion 35D of the bottom plate sheet portion 35 is installed so as to be positioned at the center in the front-rear direction of the exterior body 11, but before and after the first bent portion 35B (35BF and 35BR) of the bottom plate sheet portion 35. By adjusting the ratio of the lengths in the direction and adjusting the ratio of the lengths in the front-rear direction of the first bent portions 25F1 and 25R1 of the upper plate component pieces 25F and 25R so as to correspond to the ratio, It is possible to appropriately adjust the position in the front-rear direction (distance between electrodes).
In the present embodiment, the end portions 35AF and 35AR of the bottom plate sheet portion 35 are bonded to the sheet material by heat fusion, but at least one of the pair of front and rear end portions 35AF and 35AR is thermally fused. It only has to be worn.

(Fourth embodiment)
FIG. 12 is a perspective view of the magnesium-air battery 10 according to the fourth embodiment, and FIG. 13 is a side sectional view of the magnesium-air battery 10 according to the fourth embodiment.
The magnesium-air battery 10 includes an electrolyte container 41 that contains an electrolyte contained in an electrolytic solution, and is configured such that when the battery is used as a battery, the electrolyte is dissolved out to become an electrolytic solution. ing. In general, water is easier to obtain than electrolyte solution (for example, saline solution), and therefore, if water can be prepared, the battery can be used and the advantage that it can be used regardless of the location can be obtained.

The electrolyte container 41 includes an electrode plate mounting sheet 42 mounted on the surface of the magnesium electrode 15 opposite to the air electrode 13 and a bag body 43 provided on the electrode plate mounting sheet 42.
As shown in FIG. 13, the electrode plate mounting sheet 42 is held between a pair of front and rear upper plate portion constituting pieces 25 </ b> F and 25 </ b> R of the exterior body 11. More specifically, as shown in FIG. 13, the second bent portions 25F2 and 25R2 of the upper plate portion constituting pieces 25F and 25R are bent to the outside (corresponding to the upper side) of the exterior body 11, and these second bent portions. The upper part of the electrode plate mounting sheet 42 is sandwiched between 25F2 and 25R2, and in this state, the second bent portions 25F2 and 25R2 and the electrode plate mounting sheet 42 are joined to each other by heat fusion. As a result, the upper part of the electrode plate mounting sheet 42 is held in suspension in the exterior body 11.

14A is a perspective view of the electrolyte container 41 viewed from the air electrode 13 side together with the magnesium electrode 15, and FIG. 14B is a perspective view of the electrolyte container 41 viewed from the side opposite to the air electrode 13.
The electrode plate mounting sheet 42 is formed of the same sheet material as the sheet material constituting the exterior body 11, that is, a sheet material in which paper and a heat-fusible resin are combined by a lamination process or the like. The electrode plate mounting sheet 42 includes a sheet main body 42A that covers the back surface of the magnesium electrode 15, a pair of left and right lower fitting portions 42B that are bent from the lower portion of the sheet main body 42A and fit the lower portion of the magnesium electrode 15, and a sheet main body 42A. The upper fitting part 42C which cuts and raises a part of the center of the upper part and fits into the recessed part 15D provided in the upper part of the magnesium electrode 15 is integrally provided. By these three fitting portions 42B and 42C, the movement of the magnesium electrode 15 in the vertical direction and the front-rear direction with respect to the electrode plate mounting sheet 42 is restricted.

  The electrode plate mounting sheet 42 and the magnesium electrode 15 are fixed to each other by a pair of left and right crimping fittings 45. More specifically, as the crimping fitting 45, an edge fitting (a fitting also referred to as eyelet or eyelet) that borders a round hole is used, and the crimping fitting 45 is connected to the electrode plate mounting sheet 42 and the magnesium electrode 15. The electrode plate mounting sheet 42 and the magnesium electrode 15 are fixed by mounting them in a pair of left and right round holes that penetrate therethrough.

At this time, the metal fitting provided at the tip of the wiring 15H is fixed to one crimping metal fitting 45. Thereby, the magnesium electrode 15 and the wiring 15H can be easily connected. This wiring 15H is drawn out of the exterior body 11 through the space 28K (FIG. 12) provided in the exterior body 11, and is used as a part of the negative electrode wiring instead of the tab portion 15T shown in FIG. . Note that a connection terminal (Giboshi terminal in this configuration) 15J used for wiring connection is attached to the other end of the wiring 15H to facilitate connection with other wiring.
In the example of FIG. 12, the wiring 13H is connected to the upper portion of the air electrode 13 by using the same crimping fitting 46 as the crimping fitting 45, and the same connection terminal 13J is attached to the other end of the wiring 13H. Show.

The lower fitting portion 42B formed by bending the lower portion of the electrode plate mounting sheet 42 is the same length as the separation distance (corresponding to the gap SF) between the magnesium electrode 15 and the front wall portion 22, as shown in FIG. It protrudes toward the wall portion 22 and comes into contact with the back surface of the front wall portion 22. Thereby, the lower fitting part 42B also functions as a regulating member that regulates the separation distance between the magnesium electrode 15 and the air electrode 13 to be constant.
Further, as shown in FIG. 14B, the electrode plate mounting sheet 42 is provided with a pair of left and right lower bent portions 42D formed by bending the lower portion thereof to the opposite side of the air electrode 13. As shown in FIG. 13, these lower bent portions 42 </ b> D protrude toward the rear wall portion 23 by the same length as the separation distance (corresponding to the gap SR) between the magnesium electrode 15 and the rear wall portion 23, and It abuts on the back surface and functions as a regulating member that regulates the separation distance between the magnesium electrode 15 and the rear wall portion 23 to be constant.
In this way, the positional deviation in the front-rear direction of the lower portion of the magnesium electrode 15 can be effectively suppressed, and the separation distance between the magnesium electrode 15 and the air electrode 13 can be maintained appropriately.

The bag body 43 is formed of a water-permeable material such as paper, nonwoven fabric, or woven fabric, a starch-based film such as an wafer, a polyvinyl alcohol-based film, or the like. For example, sodium chloride, which is an electrolyte, is placed inside the bag body 43, and then the upper portion of the bag body 43 is bonded to the electrode plate mounting sheet 42 by heat fusion. By heat-sealing the upper portion of the bag body 43, the electrolyte is not exposed to the outside or leaks out even if it is in various postures such as upside down. The joining of the electrode plate mounting sheet 42 and the bag body 43 is not limited to heat fusion, and a stapler, tape, or the like may be used.
The attachment position of the bag body 43 is set on the back surface (surface opposite to the magnesium electrode 15) of the electrode plate mounting sheet 42 and below the hole 25H (see FIG. 7) serving as a water inlet. . For this reason, the electrolyte can be quickly dissolved by the injected water, and an appropriate electrolytic solution can be quickly generated.
In this configuration, since the bag body 43 that encloses the electrolyte is attached to the electrode plate mounting sheet 42, a situation in which the electrolyte adheres to the magnesium electrode 15 and is corroded can be avoided. When sodium chloride is used as the electrolyte, the bag body 43 has a gap smaller than the particle size of sodium chloride, and does not allow solid sodium chloride to pass through, but has water permeability. Specifically, since the particle diameter of sodium chloride is most frequently distributed, the average pore diameter of the bag body 43 is preferably 0.05 mm to 0.3 mm, which is smaller than the particle diameter of the sodium chloride.

In addition, the mass in the case of using sodium chloride as an electrolyte is preferably in the range of 4% to 18% with respect to the mass of water to be poured. As a result of verification by the inventors, when it is less than 4%, the resistance of the electrolytic solution is increased and the voltage drop is increased, so that it is confirmed that the voltage is low and the power that can be taken out is reduced. On the other hand, when it was more than 18%, sodium chloride was saturated and deposited at the end of discharge, and it was confirmed that the sodium chloride remained in the gap between the cells to inhibit the discharge reaction and could not be discharged.
Moreover, when using sodium chloride as said electrolyte, you may include other than sodium chloride. In short, in this case, the main component of the electrolyte may be sodium chloride, and may contain other components.

As shown in FIG. 14B, the electrode plate mounting sheet 42 is provided with a cut-and-raised portion 51 that is located above the bag body 43 by cutting and raising a part of the sheet 42. The cut-and-raised part 51 includes a horizontal plate part 51A that is bent from the sheet main body 42A of the electrode plate mounting sheet 42 and extends horizontally, and a rear wall that is bent downward from the front end of the horizontal plate part 51A and contacts the rear wall part 23. It is formed in an L-shaped cross section integrally provided with the contact portion 51B.
The horizontal flat plate portion 51A is disposed below the hole 25H serving as a water injection port and above the bag body 43, and functions as a diffusion member that spreads the injected water on the horizontal plate portion 51A and diffuses it to the surroundings. To do. More specifically, the horizontal plate portion 51A is formed with a plurality of small holes at intervals, and a part of the water is dropped downward through the small holes and the rest of the water is diffused to the surroundings. . Thereby, the injected water can be diffused and supplied to the bag body 43, and the electrolyte in the bag body 43 can be efficiently dissolved, and the discharge start timing can be advanced and the electricity can be easily taken out. Moreover, it becomes easy to avoid partial corrosion by reducing the concentration gradient at the start of water injection.
Further, the horizontal plate portion 51A also functions as a guide for the insertion depth of the water injection jig when water is injected using a water injection jig or the like. Thereby, it is possible to prevent the bag body 43 from being damaged by a water injection jig or the like.

In addition, since hydrogen is generated after the discharge is started, the electrolytic solution is agitated by the generation of this hydrogen, and the concentration gradient can be further reduced.
Further, in this embodiment, as shown in FIG. 14, a pair of left and right raised portions 51 are provided, and one or both of the raised portions can be bent according to the size of the bag body 43. ing. For example, in the example of FIG. 14B, the bag body 43 is disposed only below the one cut and raised portion 51, so that only one cut and raised portion 51 may be bent. On the other hand, in the case where the bag body 43 is wide so as to be arranged below both of the cut and raised portions 51, both the cut and raised portions 51 are bent, and water is poured from both the hole portions 25H, so that the electrolyte is obtained. It can be dissolved efficiently.

As described above, in the present embodiment, an electrolyte container that contains an electrolyte for operating as a battery by pouring water into the exterior body 11 on the surface of the magnesium electrode 15 opposite to the air electrode 13. 41 is provided, it is possible to use the battery as a battery simply by adding an electrolyte solvent, and to suppress the corrosion of the magnesium electrode 15 due to the influence of the electrolyte.
In addition, the electrolyte container 41 is a sheet material containing paper, and is attached to the electrode plate mounting sheet 42 on the surface of the magnesium electrode 15 opposite to the air electrode 13, and the electrode plate mounting sheet 42. Therefore, the sheet material is interposed between the magnesium electrode 15 and the electrolyte, and corrosion of the magnesium electrode 15 due to the influence of the electrolyte can be suppressed. Moreover, since it is not necessary to attach the bag body 43 containing the electrolyte to the exterior body 11, the configuration of the exterior body 11 can be easily simplified, and the attachment work of the bag body 43 is also easy.

In addition, since the electrode plate mounting sheet 42 is pressure-bonded and fixed to the magnesium electrode 15 and the bag body 43 is fused to the electrode plate mounting sheet 42, the electrode plate mounting sheet 42 and the bag body 43 can be easily attached.
Further, the electrode plate mounting sheet 42 has a fitting portion 42B and an upper fitting portion 42C (regulating portion) for bending the part of the sheet 42 to restrict the movement of the magnesium electrode 15 relative to the sheet. Since the sheet 42 is held by the exterior body 11 and the magnesium electrode 15 is retained by the exterior body 11, a structure for directly holding the magnesium electrode 15 on the exterior body 11 side becomes unnecessary, and the exterior body 11 can be easily simplified.

  Further, since the electrode plate mounting sheet 42 is fixed above the bottom plate portion 21 of the exterior body 11 so as to be suspended, the magnesium electrode 15 supported by the electrode plate mounting sheet 42 is mounted on the bottom plate portion 21 of the exterior body 11. There is no need to place it. For this reason, the freedom degree of the lower end position of the magnesium electrode 15 improves, and as shown in FIG. 13, the lower end of the magnesium electrode 15 can be arrange | equalized with the substantially same height as the lower end of the air electrode 13. FIG. Thereby, the part which hardly contributes to the battery reaction of the magnesium electrode 15 can be reduced, and the magnesium electrode 15 can be downsized.

  In the fourth embodiment, the case where the electrode plate mounting sheet 42 is fixed in a suspended manner above the bottom plate portion 21 of the exterior body 11 has been described. However, as shown in FIG. It may extend downward until it reaches the bottom plate portion 21 of the body 11, and the lower portion of the electrode plate mounting sheet 42 may be placed on the bottom plate portion 21. In this case, the relatively heavy magnesium electrode 15 can be supported using the bottom plate portion 21 of the exterior body 11.

An example of the electrolyte container 41 in this case is shown in FIGS. 16 (A) and 16 (B). As shown in FIGS. 16A and 16B, the lower portion of the electrode plate mounting sheet 42 is bent so as to form a flat plate portion 42G that matches the opening shape in the exterior body 11. As a result, a wide contact area between the lower portion (flat plate portion 42G) of the electrode plate mounting sheet 42 and the bottom plate portion 21 of the exterior body 11 can be secured, and the supporting force of the electrode plate mounting sheet 42 is ensured and the bottom plate portion. It becomes easy to suppress the deformation of 21.
In addition, since the lower part (the flat plate portion 42G) of the electrode plate mounting sheet 42 is fitted in the exterior body 11 and the movement of the electrode plate mounting sheet 42 is restricted, the displacement of the electrode plate mounting sheet 42 can be effectively restricted. it can.

16A and 16B, the electrode plate mounting sheet 42 is provided with an overhanging portion 42H that protrudes to the left and right outside at a position above the flat plate portion 42G, and each overhanging portion 42H is left and right. The left and right lower fitting portions 42B into which the lower portion of the magnesium electrode 15 is fitted are formed by bending the central portion and inserting a part thereof into the flat plate portion 42G. However, the shape of each part such as the lower fitting portion 42B and the flat plate portion 42G is not limited to the above shape, and can be changed as appropriate.
In FIGS. 16A and 16B, the cut-and-raised part 51 (see FIG. 14B) is not formed in the electrode plate mounting sheet 42. That is, the presence or absence of the cut-and-raised portion 51 can be changed as appropriate. As described above, the shape of each part of the electrode plate mounting sheet 42 may be appropriately changed within a range in which the above functions can be realized.

(Fifth embodiment)
FIG. 17 is a side sectional view of the magnesium-air battery 10 according to the fifth embodiment. The magnesium-air battery 10 is the same as the fourth embodiment in that it has an electrolyte container 41 including an electrode plate mounting sheet 42 and a bag body 43, but the electrode plate mounting sheet 42 forms the outer package 11. This is different from the fourth embodiment in that it is provided integrally with the sheet material.

FIG. 18 is a perspective view of the exterior body 11, and FIG. 19A is a developed view of the exterior body 11 (= a figure corresponding to the punched sheet 100). FIG. 19B is a diagram corresponding to the X region in FIG. 18, FIG. 19C is a diagram corresponding to the Y region in FIG. 18, and FIG. 19D is a diagram corresponding to the Z region in FIG. It is an equivalent figure.
As shown in FIGS. 18 and 19A, the exterior body 11 is a first lid portion (upper plate portion 25) that is bent at the upper edge 23 </ b> A of the rear wall portion 23 and covers the magnesium electrode 15. The electrode plate mounting sheet 42 is connected to the bent portion 25R1 through a fold 23C. The electrode plate mounting sheet 42 has a rectangular sheet main body 42A that is bent into the exterior body 11 through a fold 23C, and the magnesium electrode 15 is crimped to the sheet main body 42A by a pair of left and right crimping fittings 45 (FIG. 17). Fixed.

Further, the first bent portion 25F1, which is a lid portion that is bent at the upper edge 23A (corresponding to the fold) of the front wall portion 22 and covers the upper portion of the magnesium electrode 15, includes the first bent portion 25R1, the electrode plate mounting sheet 42, and the like. The insertion part 62 inserted in the opening part 61 (FIG.19 (A)) provided in the boundary part of this and the pair of right and left tab parts 63 located in the right and left of the insertion part 62 are provided integrally.
When the exterior body 11 is assembled, the first bent portions 25F1 and 25R1 are connected to each other by inserting the insertion portion 62 into the opening portion 61 as shown in FIG. In addition, as shown in FIG. 18, the pair of left and right tab portions 63 are bent inside the exterior body 11.

As shown in FIG. 19A, the electrode plate mounting sheet 42 includes a pair of left and right side pieces 42J continuous to the left and right side edges of the sheet main body 42A and a lower piece 42K continuous to the lower edge of the sheet main body 42A. Have.
The pair of left and right side pieces 42J are divided into upper and lower parts to constitute an upper side piece 42JA and a lower side piece JB. As shown in FIG. 19 (C), the upper side piece 42JA is formed in a state where the sheet main body 42A is bent 90 degrees with respect to the lid portion (first bent portion 25R1), and the lid portion (first bent portion 25R1). It is bent at a substantially right angle so as to enter below.
In this case, the upper side piece 42JA abuts on the lower surface of the lid portion (first bent portion 25R1), thereby restricting the movement of the sheet main body 42A toward the lid portion (first bent portion 25R1). Thereby, it becomes easy to hold | maintain the sheet | seat main body 42A and a cover part (1st bending part 25R1) in a right-angled positional relationship.

The lower side piece 42JB is formed by folding the left and right side edges 42M of the sheet main body 42A and folding the inner bent portion 42JU that is bent toward the rear wall 23 side of the exterior body 11 and the outer edge 42N of the inner bent portion 42JU. It integrally has an outer bent portion 42JS that is bent left and right.
As shown in FIG. 19C and FIG. 19D, the outer bent portion RS is joined to the rear wall portion 23 of the exterior body 11 by thermal fusion. Thereby, the seat main body 42 </ b> A is coupled to the rear wall portion 23. In this case, as shown in FIG. 17, since the inner bent portion 42JU bridges between the seat main body 42A and the rear wall portion 23, the separation distance between the seat main body 42A and the rear wall portion 23 can be kept constant. . Accordingly, the sheet main body 42A can be positioned and held, the supporting strength of the relatively heavy magnesium electrode 15 can be sufficiently secured, and the separation distance between the magnesium electrode 15 and the air electrode 13 is made constant. Can be maintained.

As shown in FIG. 18, the lower piece 42K connected to the lower edge of the sheet main body 42A is bent upward with respect to the lower edge of the sheet main body 42A and joined to the sheet main body 42A by heat fusion. Thereby, compared with the structure which is not provided with the said lower side 42K, the penetration | invasion of the water | moisture content (electrolyte solution) to a sheet | seat end surface can be suppressed, and the strength reduction of a sheet | seat can be suppressed. Instead of providing and bending the lower piece 42K, the lower edge of the sheet main body 42A may be covered with a tape-like plastic film to prevent moisture from entering the sheet end surface.
In this configuration, as shown in FIG. 17, the lower end of the electrode plate mounting sheet 42 is located above the bottom plate portion 21 of the exterior body 11. That is, the electrode plate mounting sheet 42 is supported in a suspended manner on the lid portion (first bent portion 25R1) of the exterior body 11. Accordingly, it is not necessary to place the magnesium electrode 15 supported by the electrode plate mounting sheet 42 on the bottom plate portion 21 of the exterior body 11, and the degree of freedom of the lower end position of the magnesium electrode 15 is improved.

  In this way, by setting the lower end of the magnesium electrode 15 to a position higher than the lower end of the air electrode 13, a wide space between the magnesium electrode 15 and the bottom plate portion 21 of the exterior body 11 can be secured. Thereby, the part which hardly contributes to the battery reaction of the magnesium electrode 15 can be reduced, and the magnesium electrode 15 can be downsized. Note that the lower end of the magnesium electrode 15 may be aligned at substantially the same height as the lower end of the air electrode 13.

As shown in FIG. 19A, a sheet piece 71R is integrally provided on the upper edge of a pair of left and right side wall portion constituting pieces 24R (more specifically, inner bent pieces 24RU) that are continuous to the left and right of the rear wall portion 23. It is done. As shown in FIG. 19C, these sheet pieces 71R are joined to the lower surface of the first bent portion 25R1 serving as a lid portion of the exterior body 11 by heat fusion. Accordingly, the bonding strength between the side wall portion constituting piece 24R and the first bent portion 25R1 is improved, and the rear wall portion 23, the side wall portion (side wall portion constituting piece 24R), and the lid portion (first bent portion 25R1) are bent. Can be held sufficiently.
Similarly, the sheet piece 71F (FIG. 19A) is also integrally formed on the upper edge of the pair of left and right side wall part constituting pieces 24F (more specifically, the inner bent piece 24FU) that are continuous to the left and right of the front wall part 22. Provided. As shown in FIG. 19C, these sheet pieces 71 </ b> F are joined to the lower surface of the first bent portion 25 </ b> F <b> 1 serving as the lid portion of the exterior body 11 by heat fusion. This improves the bonding strength between the side wall portion constituting piece 24F and the first bent portion 25F1, and the bent shape of the front wall portion 22, the side wall portion (side wall portion constituting piece 24F), and the lid portion (first bent portion 25F1). Can be held sufficiently.

As described above, in the present embodiment, the electrode plate mounting sheet 42 mounted on the surface of the magnesium electrode 15 (metal electrode) opposite to the air electrode 13 is integrated with the sheet material forming the exterior body 11. Since it is provided, in addition to the various effects of the fourth embodiment, the number of parts can be reduced.
Moreover, since the electrode plate mounting sheet 42 is provided on the lid (first bent portion 25R1), the electrode plate mounting sheet 42 is suspended above the bottom plate portion 21 of the exterior body 11, as shown in FIG. Can be fixed. For this reason, it is not necessary to place the magnesium electrode 15 supported by the electrode plate mounting sheet 42 on the bottom plate portion 21 of the exterior body 11, and the degree of freedom of the lower end position of the magnesium electrode 15 is improved. Therefore, it is possible to secure a wide space that does not affect the battery reaction even if a space for pouring water and mixing with the electrolyte or a product (magnesium hydroxide in this configuration) generated by the discharge reaction is accumulated.

  Further, since the left and right sides of the electrode plate mounting sheet 42 are bent and joined to the rear wall portion 23 of the exterior body 11, the electrode plate mounting sheet 42 can be positioned and held, and the magnesium electrode 15 (metal electrode) is supported. The strength can be easily secured, and the distance between the magnesium electrode 15 and the air electrode 13 can be kept constant.

As mentioned above, although the form for implementing this invention was described, this invention is not limited to above-mentioned embodiment, Various deformation | transformation and change are possible based on the technical idea of this invention.
For example, the shape of the exterior body 11 may be appropriately changed, and the shapes of the air electrode 13 and the magnesium electrode 15 may be appropriately changed. Further, the sheet material used for the outer package 11 may be a single-sided laminated paper obtained by laminating only the inner surface of the outer package 11, or a sheet material other than the laminated paper, the sheet material containing paper. It may be used.

  Further, in the first embodiment, the upper plate component piece 25R connected to the rear wall portion 23 is divided on the basis of the tab portion 15T, and the upper plate component piece 25R leads the magnesium electrode 15 to the air electrode 13 side. Although the case where both the movement and the movement to the opposite side are regulated has been described, the present invention is not limited to this. For example, the upper plate component piece 25F of the front wall portion 22 is divided on the basis of the tab portion 15T, and the upper plate component piece 25F moves the magnesium electrode 15 to the opposite side to the air electrode 13 side. Both of them may be regulated.

Moreover, although 1st Embodiment demonstrated the case where a pair of upper-plate part component pieces 25F and 25R were bent in L shape and the movement of the magnesium electrode 15 was controlled, it is in the range which can control the movement of the magnesium electrode 15. The way of bending the pair of upper plate portion constituting pieces 25F and 25R may be changed. Moreover, you may abbreviate | omit either one of the support of the magnesium electrode 15 by the upper-plate part component pieces 25F and 25R in the range which can control the movement of the magnesium electrode 15 appropriately.
Moreover, although the example which has the baseplate part 21 bent by the downward convex shape which the lower end of the magnesium electrode 15 fits in the above-mentioned Example was demonstrated, also by bending the baseplate part 21 to an upward convex shape The lower end of the magnesium electrode 15 can be held. In this case, although the magnesium electrode 15 is not parallel to the air electrode 13, the movement prevention of the magnesium electrode 15 can be made stronger.
Further, in the present embodiment, the case where the folded portions and the sheet pieces 26F, 26R, 71F, 71R are joined by heat fusion is shown, but the joining is not limited to this, and other joining methods such as ultrasonic sealing are used. It may be adopted.

In each of the above-described embodiments, the single-cell magnesium air battery 10 has been described. However, the present invention is not limited to the intended use, and a plurality of magnesium air batteries 10 are connected in series according to the voltage, current, etc. of the load to be used. Can be used in parallel. Also, there is no particular limitation on the form of use, for example, a plurality of magnesium-air batteries 10 are fastened with a binding band or the like, or are used in a plastic case made of resin, an iron box, etc. It is also possible to do.
Further, in each of the above-described embodiments, the case where the present invention is applied to the magnesium-air battery 10 has been described. However, the present invention is not limited to this and can be widely applied to known metal-air batteries. For example, it is possible to use a metal such as zinc, iron, aluminum, or an alloy thereof for the metal electrode. When zinc is used for the metal electrode, an aqueous potassium hydroxide solution may be used for the electrolytic solution. When iron is used for the metal electrode, an alkaline aqueous solution may be used for the electrolytic solution. When aluminum is used for the metal electrode, an electrolytic solution containing sodium hydroxide or potassium hydroxide may be used.

10 Magnesium air battery (metal-air battery)
11 Exterior Body 13 Air Electrode 13T Tab Part of Air Electrode 15 Magnesium Electrode (Metal Electrode)
15T metal electrode tab portion 21 bottom plate portion 22 front wall portion 23 rear wall portion 24F, 24R side wall portion constituting piece (side wall portion)
25F, 25R Upper plate component piece (support bent part, lid part)
25F1, 25R1 1st bending part 25F2, 25R2 2nd bending part (folding part)
25F3, 25R3 Third bent portion (folded portion)
25X Tab portion side split portion 25Y Non-tab portion side split portion 26F, 26R Sheet piece 35 Bottom plate sheet portion 41 Electrolyte container 42 Electrode plate mounting sheet 42B Fitting portion (regulator)
42C Upper fitting part (regulation part)
43 Bag 100 Sheet material (Punched sheet)
SF, SR Clearance UL Liquid level of electrolyte

Further, the electrode plate mounting sheet may be fixed by pressure to the metal electrode, and the bag body may be fused to the electrode plate mounting sheet. According to this configuration, the electrode plate mounting sheet and the bag body can be easily attached.
Further, the electrode plate mounting sheet may be folded part of the sheet so as to have a regulating portion for regulating the movement of the metal electrode with respect to the sheet.

Further, the present invention provides a metal-air battery including an exterior body that has an air electrode and accommodates a metal electrode facing the air electrode, and has water in the exterior body on a surface of the metal electrode opposite to the air electrode. An electrolyte container that contains an electrolyte for operating as a battery by pouring is provided, and the electrolyte container is mounted on an electrode plate mounting sheet that is mounted on a surface of the metal electrode opposite to the air electrode, A bag body that is bonded to an electrode plate mounting sheet and accommodates the electrolyte, and the exterior body is formed of a sheet material containing paper, and the sheet material covers the metal electrode with a gap therebetween, A part of the sheet material is bent so as to cross the gap, and a supporting bent portion for supporting the electrode plate mounting sheet is integrally provided.
The sheet material is preferably paper laminated with a heat-fusible resin. According to this configuration, for example, by setting the paper ratio to exceed 50%, it is easy to separate and dispose of the paper according to the rules of each local government, and to easily obtain it.

Claims (15)

In a metal-air battery comprising an exterior body that has an air electrode and accommodates a metal electrode facing the air electrode,
The exterior body is formed of a sheet material containing paper, and the sheet material covers the metal electrode with a gap therebetween, and a part of the sheet material is folded to cross the gap, and the metal electrode is A metal-air battery comprising a supporting bent portion for supporting.   2. The metal-air battery according to claim 1, wherein the supporting bent portion holds the metal electrode at a position separated from the air electrode. 3.   The supporting bent portion is bent toward the metal electrode from at least one of the wall portion on the air electrode side and the wall portion on the opposite side to the air electrode with respect to the metal electrode in the sheet material. 4. The metal-air battery according to claim 3, further comprising a first bent portion and a second bent portion that is bent from a tip of the first bent portion and contacts the metal electrode.   The said 1st bending part is provided above the liquid level of the electrolyte solution in the said exterior body, and it inclines diagonally downward toward the said metal electrode, It is characterized by the above-mentioned. Metal-air battery. The metal electrode has a tab portion protruding upward, and the supporting bent portion extends over the width of the metal electrode,
The supporting bent portion is divided in the width direction of the metal electrode with reference to a boundary between the tab portion and the non-tab portion without the tab portion, and the divided portion on the tab portion side and the non-tab portion One of the divided parts on the side restricts movement of the metal electrode to the air electrode side, and the other restricts movement of the metal electrode to the opposite side of the air electrode. 5. The metal-air battery according to any one of 4 above.   The metal-air battery according to any one of claims 1 to 5, wherein the exterior body has a bottom plate portion bent into a downward convex shape into which a lower end of the metal electrode is fitted. The supporting bent portion is bent from the wall portion on the air electrode side and the wall portion on the opposite side of the air electrode to the inside of the exterior body along the metal electrode, and is folded back to the opposite side to the metal portion. It has a folded part that protrudes outside the outer body than the pole,
3. The metal electrode is sandwiched by a part of each folded portion, and the portions protruding outside the remaining exterior body are joined together to seal between the folded portions. Metal-air battery.   The said exterior body is provided with the sheet piece joined to the side wall part which continues to the cover part which covers the upper direction of the said metal electrode, and covers the side of the said metal electrode. Metal-air battery. A sheet material containing paper, comprising a bottom plate sheet portion bent into a downward convex shape into which the lower end of the metal electrode fits,
The metal-air battery according to any one of claims 1 to 8, wherein at least one of a pair of front and rear ends of the bottom plate sheet portion is joined to a sheet material forming the exterior body. Folding the sheet material forming the exterior body into a concave shape opening upward to form the bottom plate portion of the exterior body,
In the state where the sheet material forming the exterior body is spread in a planar shape, the bottom plate sheet portion is joined to at least one of a pair of front and rear ends so as to straddle the bottom plate portion. When bent into the concave shape that opens upward, it has a pair of upright portions that stand on the inner side of the exterior body so as to be separated from the bottom plate portion, and the lower end of the metal electrode fits between the pair of upright portions The metal-air battery according to claim 9.   2. An electrolyte container that houses an electrolyte for operating as a battery by pouring water into the exterior body on a surface of the metal electrode opposite to the air electrode. The metal-air battery according to any one of 10.   The electrolyte container is a sheet material containing paper and is mounted on a surface of the metal electrode opposite to the air electrode, and the electrolyte container is bonded to the electrode plate mounting sheet to store the electrolyte. The metal-air battery according to claim 11, further comprising a bag body.   The metal-air battery according to claim 12, wherein the electrode plate mounting sheet is fixed by pressure to the metal electrode, and the bag body is fused to the electrode plate mounting sheet. The electrode plate mounting sheet has a regulating part that bends a part of the sheet and regulates the movement of the metal electrode with respect to the sheet,
The metal-air battery according to claim 12 or 13, wherein the metal electrode is held on the exterior body by holding the electrode plate mounting sheet on the exterior body.   The metal-air battery according to any one of claims 1 to 14, wherein the sheet material is paper laminated with a heat-fusible resin.

Images