JP5690443B1 - Metal-air battery unit - Google Patents

Abstract

An object of the present invention is to suppress the expansion of an air electrode of a metal-air battery so that the weight can be reduced. SOLUTION: A plurality of metal air batteries 70 configured by providing an outer electrode and an air electrode and a metal electrode are provided, and the plurality of metal air batteries 70 are provided in an outer box 10 with a gap in which air stays. A protruding piece 81 that is housed and protrudes into the gap to support the air electrode is provided on the side surface of the outer box 10. [Selection] Figure 1

Description

  The present invention relates to a metal-air battery unit. More specifically, the present invention relates to a metal-air battery unit including a metal electrode such as magnesium and an exterior body that houses an air electrode, and relates to a metal-air battery unit in which a plurality of the metal-air batteries are connected and stored.

2. Description of the Related Art Conventionally, metal-air batteries that can generate electric power when an electrolyte such as saline is injected in a natural disaster, wind and flood damage, or in an environment where it is difficult to obtain an AC power source are known. This type of metal-air battery can also be used by being laminated (see, for example, Patent Document 1).
By the way, when this type of metal-air battery is stacked and used, a large gap is generally provided in front of the air electrode of the metal-air battery.

Japanese Utility Model Publication No. 58-46535

However, this type of metal-air battery has a problem in that a product generated by a battery reaction between electrodes floats between both electrodes and expands the outer package.
When the exterior body expands, the gap in front of the air electrode may be narrowed or the gap may be lost, resulting in a problem that the battery output is reduced.
Further, when the exterior body expands, the distance between the air electrode and the metal electrode increases, which also causes a problem that the battery output is reduced.
Furthermore, in the case of using a plurality of metal-air batteries connected, it has been desired to reduce the weight of the metal-air battery unit.

  Accordingly, an object of the present invention is to provide a metal-air battery unit that can suppress the expansion of the outer casing of the metal-air battery and can reduce the weight.

In order to achieve the above object, the present invention provides a metal-air battery in which an exterior body that has an air electrode and accommodates a metal electrode facing the air electrode and an electrolyte is formed of a sheet material containing paper. collision there are, the front Kikin genus air cell, at a gap of air staying a plurality housed in an outer box made of paper, which on the side surface of the outer box, supporting the outer body protrudes into the gap A spacer is disposed between the metal-air batteries, and the protrusion is locked to the spacer .
In this case, the projecting piece may be connected to a side surface portion of the outer box via a part of the scheduled separation part, and the planned separation part may be separated and protrude into the gap to support the exterior body.
In the present invention, since the protruding piece provided on the side surface portion of the outer box protrudes into the gap and supports the exterior body, the expansion of the exterior body of the metal-air battery can be suppressed, and the output of the battery can be prevented from decreasing.

A plurality of the protruding pieces may be provided on the side surface portion of the outer box with an interval in the vertical direction.
A spacer may be disposed between the metal-air batteries, and the protruding piece may be locked to the spacer.
Wherein is arranged a frame member on the side surface of the exterior body, the said the opening of the frame member metal-air battery of the air electrode is disposed, the protrusion is not good even supporting the frame member.

The spacer is an elevational body specific spacer, provided with a retention part which air stagnates in the center, on both sides of the retention portion may comprise a pocket metal-air battery is disposed opposite the air electrode .
The spacer may be three-dimensionally formed by bending a sheet of cardboard.
The present invention is also a metal-air battery in which an exterior body that has an air electrode and accommodates a metal electrode facing the air electrode and an electrolyte is formed of a sheet material containing paper, the metal air A plurality of batteries are housed in a paper outer box with a gap in which air stays, and are connected to a side surface portion of the outer box via a part of the scheduled disconnection part, and the planned disconnection part is disconnected. Protruding pieces that protrude into the gap and support the exterior body are provided.

In the present invention, since the projecting piece provided on the outer box projects into the gap to support the exterior body, the expansion of the exterior body of the metal-air battery can be suppressed and the output of the battery can be prevented from decreasing.
Moreover, if the exterior body and the outer box are made of paper, the weight of the metal-air battery unit can be reduced.

It is a perspective view of the metal air battery unit which concerns on embodiment of this invention. It is a perspective view of a metal air battery unit similarly. It is a perspective view of the spacer which accommodated the metal air battery. It is a perspective view of a spacer simple substance. It is a top view of a spacer simple substance. It is a side view of a spacer simple substance. FIG. 9 is a cross-sectional view corresponding to the line II shown in FIG. 8 of the metal-air battery. It is an upper part perspective view before the bending of the exterior body upper part of a metal air battery. It is an expanded view of a spacer. It is an expanded view of an outer box. It is the perspective view which showed the other Example of the metal air battery unit. It is the perspective view which showed the other Example of the metal air battery unit.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 and 2 are perspective views of the metal-air battery unit 1. The metal-air battery unit 1 includes a cardboard outer box 10. In the outer box 10, two cardboard spacers 30 are arranged side by side so that a metal-air battery (magnesium-air battery) 70 to be accommodated does not move carelessly.
3 and 4 are perspective views of the spacer 30, FIG. 5 is a top view of the spacer 30, and FIG. 6 is a side view of the spacer 30. The spacer 30 is formed by bending a piece of corrugated paper, and two pockets (battery accommodating portions) 50 are provided on both sides. In the pockets 50, metal-air batteries 70 are accommodated, respectively.
The metal-air battery unit 1 includes a total of four metal-air batteries 70, and the four metal-air batteries 70 are connected in series by wiring 90 and connected to a DC / DC converter 150 as shown in FIG. ing. Note that the two wirings 90 are insulated from each other and combined together just before being connected to the DC / DC converter 150.

  As shown in FIG. 7, the metal-air battery 70 includes a hollow box-shaped exterior body 71 formed by folding and folding a sheet material that can be bent in two, joining the edges on both sides, and bending the sheet material. I have. The exterior body 71 is provided with an air electrode 72, a magnesium electrode (metal electrode) 73 is accommodated so as to face the air electrode 72, and an electrolytic solution such as a saline solution is placed up to the liquid line UL. The metal-air battery 70 is a primary battery, with the air electrode 72 acting as a positive electrode and the magnesium electrode 73 acting as a negative electrode.

The exterior body 71 integrally includes a rectangular bottom plate portion 74, a rectangular front wall portion 75, a rectangular rear wall portion 76, and left and right side wall portions. The front wall 75 is provided with a rectangular opening 75A, and the air electrode 72 is disposed in the opening 75A.
The air electrode 72 is made of a material obtained by mixing carbon and Teflon (registered trademark) with a rectangular copper mesh (copper wire mesh) into a sheet shape having a predetermined thickness using a roller press or the like. A sheet that was dried and baked at a temperature and cut into a size approximately the same as the copper mesh was pressed from both sides of the copper mesh, and then a tab was formed to connect the wiring to the copper mesh by a known method. This is a structure in which an object is bonded to the opening 75A of the exterior body 71 with an adhesive or the like, and has air permeability and non-water permeability.
That is, the air electrode 72 has a non-water-permeability in which external air can be passed through the exterior body 71 and the electrolytic solution inside the exterior body 71 is not permeable to the outside. A wide variety of known configurations can be applied to the air electrode 72.

The bottom plate portion 74 is formed in a downwardly convex V-shape when viewed from the side.
The lower end of the magnesium electrode 73 is guided by the inclination of the bottom plate portion 74 and fits into the downward convex portion 74T, and the lower end of the magnesium electrode 73 is easily positioned.
The upper ends of the front wall portion 75 and the rear wall portion 76 are bent. The first bent portions 77F1 and 77R1 appropriately maintain the separation distance between the magnesium electrode 73 and the air electrode 72, and the second bent portions 77F2 and 77R2 support the upper portion of the magnesium electrode 73. On both sides of the magnesium electrode 73, gaps SF and SR having the same width are provided.
The second bent portions 77F2 and 77R2 are supported by the front wall portion 75 and the rear wall portion 76 so as to sandwich the magnesium electrode 73 by being alternately bent in front of the magnesium electrode 73 or over the magnesium electrode 73.

Specifically, as shown in FIG. 8, the upper portion of the exterior body 71 includes first bent portions 77F1 and 77R1 and second bent portions 77F2 and 77R2 at the upper ends of the front wall portion 75 and the rear wall portion 76. . Two cuts 77a are made in the second bent portions 77F2 and 77R2 so as to be separated from each other. The second bent portions 77F2 and 77R2 are divided into three by two notches 77a. As shown in FIG. 7, both end portions 77 </ b> F <b> 2-2 of the second bent portion 77 </ b> F <b> 2 are inserted in front of the upper portion of the magnesium electrode 73 housed in the exterior body 71. Be inserted into the back beyond.
On the other hand, both end portions 77R2-1 of the second bent portion 77R2 of the rear wall portion 76 are inserted beyond the upper portion of the magnesium electrode 73, and both end portions 77F2-1 of the second bent portion 77F2 of the front wall portion 75 are inserted. Touch. The central portion 77R2-2 is inserted in front of the upper portion of the magnesium electrode 73 and is in contact with the central portion 77F2-2 of the second bent portion 77F2 of the front wall portion 75. By doing in this way, the upper part of the magnesium electrode 73 is supported so as to be sandwiched, and the fixing is made more surely strong.
The bent portion 78 at the upper end of the side wall is bent in an L shape. The tip of the bent portion 78 is inserted into the slit 77S provided in the first bent portions 77F1 and 77R1 when the exterior body 71 is assembled. The restoration of the first bent portions 77F1, 77R1 and the like to be bent is prevented, and the upper surface of the exterior body 71 is sealed. The portion indicated by the alternate long and short dash line is a mountain fold. In addition, the wiring connected to the magnesium electrode 73 is led out of the exterior body 71 from the bending gap of the exterior body 71.

  The exterior body 71 is made of a sheet material containing paper. As the sheet material, paper having both surfaces laminated with a heat-fusible resin (for example, polyethylene (PE)), that is, laminated paper (also referred to as double-sided laminated paper) is used. When laminated paper is used for the exterior body 71, the electrolyte does not ooze out (leak), and is lighter and cheaper than when a metal can or a resin container is used.

The sheet material containing paper in this configuration is a composite of paper and a heat-fusible resin by laminating or the like.
The ratio of the paper in the sheet material is preferably more than 50%. The exterior body 71 having this configuration can be discarded as, for example, paper waste by setting the paper ratio to exceed 50%. As the paper, paper having a relatively thick strength, such as a coated ball, an uncoated ball, a paperboard, and a cardboard, can be suitably used. As the heat-fusible resin, it is possible to form a liquid-tight box by joining sheet materials by heat-sealing, and any resin can be used as long as it can be heat-sealed. However, it is preferable to use a polyolefin resin such as polyethylene, polypropylene, and ethylene-vinyl acetate copolymer. The thickness of the heat-adhesive resin is at least 10 μm, preferably 20 μm or more in order to obtain a sufficient heat-sealed state. The surface on the inner surface side of the exterior body is preferably set to a thickness of 40 μm or more in order to ensure sealing performance. When such a sheet material is used as the exterior body, the expansion is remarkable.

FIG. 9 is a development view of the spacer 30.
The spacer 30 is formed by bending a sheet of cardboard paper 100. The cardboard paper 100 is cut with a die by a press.
The spacer 30 is not limited to the corrugated cardboard 100, and may be formed of, for example, cardboard, or may be formed of a resin sheet.
An upper surface connection portion 34 is disposed at the center of the cardboard paper 100. Inner side surface portions 32 and 32 are disposed at both ends of the upper surface connecting portion 34 via folding lines 101 and 101, respectively, and the folding lines 101 and 101 are mountain-folded. Bottom surface portions 33 and 33 are connected to the inner side surface portions 32 and 32 via folding lines 103 and 103, and the outer side surface portion 31 is connected to the bottom surface portions 33 and 33 via folding lines 105 and 105. , 31 are connected. The fold lines 103 and 103 and the fold lines 105 and 105 are valley-folded.

On both sides of the inner side surface portions 32, 32, claw holding portions 37, 37 are provided via folding lines 37a, 37a. The claw holding portions 37, 37 are provided with upper claws 36, 36 via folding lines 36a, 36a.
Further, lower claws 35 and 35 are provided on both sides of the inner side surface portions 32 and 32 via folding lines 35a and 35a. A claw hole holding portion 38 is provided on both sides of the outer side surface portions 31 and 31 via folding lines 38a and 38a. The claw holes 39 are cut in the claw hole holding portion 38.

A pair of circular air port portions 46, 46 are formed in the upper surface connection portion 34, and a rectangular groove 45 is formed at an intermediate portion between the air port portions 46, 46.
An air electrode opening 47 is formed on the inner side surface portions 32, 32 leaving the frame member 44, and a rectangular groove 47 a is formed in the air electrode opening 47.
A pair of floating support portions 51, 51 are disposed on the bottom surface portions 33, 33 across the inner side surface portions 32, 32. The floating support portions 51 and 51 are provided with cuts 51a and 51a on both sides, respectively. Three folding lines 51b, 51c, 51d are arranged between the notches 51a, 51a.

A procedure for folding the spacer 30 will be described.
First, the folding lines 101 and 101 at both ends of the upper surface connecting portion 34 are folded in a mountain, and the folding lines 103 and 103 and the folding lines 105 and 105 on both sides thereof are folded in a valley. Then, as shown in FIG. 4 and FIG. 6, it is bent into a substantially W shape in a side view.
Next, the lower claws 35 are bent and the lower claws are fitted to each other. Thereby, as shown in FIG. 6, a pair of inner side surface parts 32 and 32 are hold | maintained in parallel. And the part enclosed by the inner side surface parts 32 and 32 comprises the retention part 60 as a space | gap where air retains.
As shown in FIG. 4, the claw holding portions 37 and 37 and the claw hole holding portion 38 are bent, and the upper claw 36 and 36 of the claw holding portions 37 and 37 are fitted into the claw holes 39 and 39 of the claw hole holding portion 38. Combined. As a result, as shown in FIG. 6, the outer side surface portions 31, 31 and the inner side surface portions 32, 32 are held in parallel. A portion surrounded by the outer side surface portions 31, 31 and the inner side surface portions 32, 32 constitutes a pocket 50. As shown in FIG. 3, the metal-air batteries 70 are accommodated in the pockets 50, respectively. The metal-air battery 70 is accommodated with the air electrode 72 facing the air electrode opening 47 of the inner side surface portions 32, 32.

Referring to FIG. 9, the pair of floating support portions 51, 51 are arranged on the bottom surface portions 33, 33 as described above. The floating support portions 51 and 51 include notches 51a and 51a, and three fold lines 51b, 51c, and 51d between the notches 51a and 51a. Therefore, when the floating support 51 is pushed into the pockets 50, 50, the fold line 51b is folded in a valley, the fold line 51c is folded in a mountain, and the fold line 51d is folded in a valley. As shown in FIG. 51 is bent into an L shape. The floating support portion 51 supports the bottom plate portion 74 (FIG. 7) of the exterior body 71 of the metal-air battery 70 in a floating state. Therefore, the metal-air battery 70 is protected even when an impact is applied to the bottom of the outer box 10 while protecting the lower protrusions 79 (FIG. 7) formed at both ends of the bottom plate portion 74 of the exterior body 71 by folding the sheet material. Can be prevented from being damaged.
The corrugated cardboard used as the spacer 30 may be laminated on one or both sides with PE or the like. In this case, absorption of moisture in the air can be suppressed, and deterioration during long-term storage can be prevented.

FIG. 10 is a development view of the outer box 10.
The outer box 10 is formed by bending a sheet of cardboard paper 20. The cardboard paper 20 is cut with a die by a press.
The outer box 10 is not limited to the corrugated cardboard 20, and may be formed of, for example, cardboard, or may be formed of a resin sheet.
The corrugated cardboard paper 20 has side portions 11 (11A, 11B) with projecting pieces and side surface portions 12 (12A, 12B) without projecting pieces alternately arranged side by side at the center via fold lines 111, 113, 115. Prepare. A short lid 21 is disposed on the upper side of the side surface portion 11A via a fold line 121, and a fitting lid 22 is disposed on the upper side of the side surface portion 11B via a fold line 123. The upper lid 23 is arranged via a fold line 127. A piece 24 is disposed on the fitting lid 22 via a fold line 125, and a claw member 25 is disposed on the piece 24. A piece 26 is arranged on the upper lid 23 via a fold line 128. Here, the short lid 21, the fitting lid 22, and the upper lid 23 constitute a lid member.
The bottom surface portions 15 and 15 are disposed on the lower side of the side surface portion 11 (11A, 11B) with the projecting piece via the folding line 119, and the lower side of the side surface portion 12 (12A, 12B) without the projecting piece is disposed on the folding line 120. The bottom surface portions 16 and 16 with the fitting portions are arranged. The bottom surface portions 15 and 15 and the bottom surface portions 16 and 16 with fitting portions constitute a bottom member.

  A piece of corrugated paper 20 is bent at fold lines 111, 113, and 115, and a piece 13 connected to the side portion 12B having no protruding piece and a side portion 11A with a protruding piece are glued to form a side portion of the outer box 10. Is done. Next, the bottom surface portions 15 and 15 and the bottom surface portions 16 and 16 with fitting portions are fitted to form a bottom member. Further, as shown in FIG. 2, a lid member is formed by the short lid 21, the fitting lid 22, and the upper lid 23.

  In the present embodiment, as shown in FIG. 10, four projecting pieces (gap regulating members) 81 are provided on each of the side portions 11 (11 </ b> A, 11 </ b> B) with the projecting pieces. The projecting piece 81 includes a pair of upper projecting pieces 81A and 81A and a pair of lower projecting pieces 81B and 81B. Each projecting piece 81 has the same form, and is connected to the side surface part 11 via a part to be cut 82, for example, a perforation or a notch. Each projecting piece 81 has a claw 81C formed at the tip. Each protruding piece 81 is connected to the side surface portion 11 by a connecting portion 83 when it is separated from the side surface portion 11 by the planned separation portion 82. The width W of each protrusion 81 (81A, 81B) is formed to be equal to the inner dimension W2 (FIG. 4) of the inner side surface portions 32, 32 of the spacer 30. The length L3 (FIG. 10) of each protrusion 81 is formed to be equal to the length L4 from the claw holding portions 37, 37 to the groove portion 47a of the spacer 30 shown in FIG.

As shown in FIG. 1, the outer box 10 has two spacers 30 (FIG. 3) in which two metal-air batteries 70 are accommodated so that the air electrodes 72 face each other through the retaining portion 60. Is housed in. After the spacer 30 is accommodated, the upper projecting pieces 81 </ b> A and 81 </ b> A and the lower projecting pieces 81 </ b> B and 81 </ b> B are pushed into the outer box 10. Then, each protruding piece 81 protrudes into the outer box 10 from both sides of the outer box 10.
Each protruding piece 81 is pushed inward until the claw portion 81C (FIG. 10) is fitted into the groove portion 47a (FIG. 3) and is caught by the upper side or the lower side of the groove portion 47a.

In this embodiment, since the width W of each protrusion 81 provided in the outer box 10 is formed to be equal to the inner dimension W2 (FIG. 4) of the inner side surface portions 32, 32 of the spacer 30, each protrusion 81 is When pushed inside the outer box 10, the dimension W <b> 2 between the inner side surface portions 32, 32 is regulated by the rigidity of each protruding piece 81. In the metal-air battery 70, a product is generated by a battery reaction of the air electrode 72 and the magnesium electrode 73, and the product floats in a vacant space between the air electrode 72 and the magnesium electrode 73 and expands the front wall portion 75. The air electrode 72 is generally expanded according to the result.
In the present embodiment, the rigidity of each projecting piece 81 can suppress the expansion of the exterior body 71 and ensure the width W2 of the staying portion 60 in front of the air electrode 72 as prescribed. Therefore, a decrease in battery output can be prevented. Furthermore, since the expansion of the exterior body 71 is suppressed, the distance between the air electrode 72 and the magnesium electrode (metal electrode) 73 is maintained at a specified distance, and this can also prevent a decrease in battery output.
Since the length L3 (FIG. 10) of each protrusion 81 is formed equal to the length L4 from the claw holding portions 37, 37 of the spacer 30 shown in FIG. 3 to the groove 47a, each protrusion 81 is The frame member 44 outside the air electrode opening 47 is suppressed. Therefore, the air electrode opening 47 is not blocked by the protruding pieces 81.
In addition, as shown in FIG. 3, a regulating member 85 that regulates a gap between the inner surface of the claw hole holding portion 38 and the metal-air battery 70 may be disposed. A gap in the width direction of the metal-air battery 70 can be maintained by the protrusions 81 described above, and a gap in the length direction of the metal-air battery 70 can be maintained by the restriction member 85.
The cardboard used as the outer box 10 may be laminated on one or both sides with PE or the like. In this case, absorption of moisture in the air can be suppressed, and deterioration during long-term storage can be prevented.

In the present embodiment, a retaining portion 60 surrounded by the inner side surface portions 32, 32 is formed in the center portion of the spacer 30, and the retaining portion 60 is formed in the outer box 10 after each projecting piece 81 is pushed in. It communicates with the outside of the outer box 10 through the opening. Therefore, the air outside the outer box 10 can always be taken into the air electrode 72 of the metal-air battery 70 through the staying part 60 and the air electrode opening 47 of the spacer 30.
Since the air port portions 46 and 46 are formed in the upper surface connection portion 34 of the spacer 30, the air that has entered the staying portion 60 flows back through the air port portions 46 and 46 in the outer box 10. Therefore, even when the inside of the outer box 10 is warmed by the reaction of the metal-air battery 70, it can be cooled by air and kept at an appropriate temperature.
The air port portions 46 and 46 can be used as finger hooks when the spacer 30 is housed in the outer box 10 together with the metal air battery 70.
In the present embodiment, both the spacer 30 and the outer box 10 are produced by assembling a single cardboard. Therefore, the weight can be reduced as compared with the case where the spacer 30 and the outer box 10 are made of metal.

In the present embodiment, as shown in FIG. 1, the lid member includes a short lid 21, a fitting lid 22, and an upper lid 23. When the upper lid 23 is opened, the short lid 21 and the fitting lid 22 are exposed as shown in FIG.
Referring to FIG. 10, the fitting lid 22 has a piece 24 bent at a fold line 125. As shown in FIG. 2, the claw member 25 provided on the piece 24 has a groove 45 of the upper surface connecting portion 34 of the spacer 30. Is fitted. The fitting lid 22 hides the wiring 90, and can prevent an accident such as an object being caught on the wiring 90 with the upper lid 23 opened. The DC / DC converter 150 is housed under the short lid 21, and when the unit is used, the upper lid 23 and the short lid 22 are opened and taken out, and an electrolytic solution is injected into the metal-air battery 70 before charging a mobile phone or the like. Used for.

As mentioned above, although this invention was demonstrated based on one Embodiment, this invention is not limited to this. For example, although two protrusions 81 are provided for the staying portion 60 formed in the spacer 30, it may be one or more than three.
Further, the projecting piece 81 may be pushed in immediately before use of the unit. In this case, the opening of the outer box 10 formed by pushing the projecting piece 81 is closed during storage until use. Can be protected.
Further, the frame member may be formed separately from the spacer 30, and the presence of this frame member is preferable because the expansion suppression effect by the projecting piece 81 extends over the entire circumference of the wall portion of the exterior body 71.
Furthermore, the spacer 30 may be formed in an inverted U-shape, which may be interposed between the metal air batteries 70, or a large number of plate-like ones may be used. Furthermore, the gap in which the air formed opposite to the air electrode 72 stays is not limited to the one formed using the spacer 30, but a plate formed with a hole through which the metal-air battery 70 passes in the outer box 10. The gap may be formed by inserting the metal-air battery 70 in the hole up and down, or only the projecting piece 81 may be pushed between the metal-air batteries 70. The one shown in the form is desirable.

Further, the protruding piece 81 may be omitted. 11 and 12 show an embodiment of the metal-air battery unit 1 that does not include the protruding piece 81. The embodiment shown in FIG. 11 is a metal air unit 1 that uses an outer box 10 in which air circulation holes 92 are provided in substantially the entire side surfaces 11A and 11B that intersect perpendicularly with the metal air battery 70, and more specifically. In addition, seven air circulation holes 92 are provided in each side surface portion 11A, 11B at equal intervals in the vertical and horizontal directions.
By providing the air circulation holes 92 in substantially the entire side surfaces 11A and 11B, empty spaces in the outer box 10 (such as the staying portion 60 in the spacer 30 and the space above the spacer 30) can be removed via the air circulation holes 92. Can communicate with the outside.
For this reason, the internal air whose temperature has been raised by the reaction of the metal-air battery 70 can be discharged to the outside through the air circulation hole 92, and the metal-air battery 70 can be cooled by the external air. Therefore, each metal air battery 70 in the outer box 10 is kept at an appropriate temperature and the temperature is easily equalized.

The embodiment shown in FIG. 12 is the same as the case shown in FIG. 11 in that the air circulation holes 92 are provided in the pair of side surface portions 11A and 11B, but the air circulation holes 92 are arranged in the empty space (in the spacer 30). 11 is different from the case of FIG. 11 in that it is provided only in a region communicating with the staying portion 60 and the space above the spacer 30.
Also with this configuration, the internal air whose temperature has increased due to the reaction of the metal-air battery 70 can be discharged to the outside through the air circulation hole 92, and the metal-air battery 70 can be cooled by the external air. That is, the air circulation hole 92 is provided only in the region contributing to cooling of the metal-air battery 70, and the air circulation hole 92 is not provided in the region not contributing to cooling.
For this reason, the number of the air circulation holes 92 and the total area of the air circulation holes 92 can be reduced, and the strength of the outer box 10 can be easily improved accordingly. 11 and 12, a hole 90H through which the wiring 90 is passed is provided in the piece 24 that is folded back below the lid member (fitting lid 22) of the outer box 10.

DESCRIPTION OF SYMBOLS 1 Metal-air battery unit 10 Outer box 20, 100 Corrugated paper 30 Spacer 44 Frame member 47 Air electrode opening 50 Pocket (battery accommodating part)
51 Floating support part 60 Retaining part (gap where air stays)
70 Metal-air battery 71 Exterior body 72 Air electrode 73 Magnesium electrode (metal electrode)
81 (81A, 81B) Projection

Claims (7)

Exterior body metal electrode and the electrolyte facing the air electrode which has an air electrode is accommodated, a metal-air battery, which is formed by a sheet material containing paper, the previous Kikin genus air battery, air A plurality of pieces are accommodated in a paper outer box with a gap in which the air stays, and a projecting piece that protrudes into the gap and supports the exterior body is provided on a side surface of the outer box, and a spacer is provided between the metal-air batteries. A metal-air battery unit, wherein the metal-air battery unit is disposed and the projecting piece is locked to the spacer . 2. The projecting piece is connected to a side surface portion of the outer box via a part of a predetermined separation part, and the separation part is separated and protrudes into the gap to support the exterior body. The metal-air battery unit described in 1. The spacer is a three-dimensional spacer, and has a staying portion in which air stays in a central portion, and the metal-air battery is disposed on both sides of the staying portion with the air electrode of the metal-air battery facing each other. The metal-air battery unit according to claim 1, further comprising a pocket. The metal-air battery unit according to claim 3, wherein the spacer is three-dimensionally formed by bending a sheet of cardboard. An outer body that has an air electrode and that accommodates a metal electrode facing the air electrode and an electrolyte is a metal-air battery formed of a sheet material containing paper, and the metal-air battery retains air A plurality of paper is accommodated in a paper outer box with a gap to be connected, and is connected to a side surface portion of the outer box via a part of a scheduled separation part, and the planned separation part is separated and protrudes into the gap. A metal-air battery unit comprising a projecting piece for supporting the exterior body. 6. The frame member is disposed on a side surface of the exterior body, the air electrode is disposed in an opening of the frame member, and the projecting piece supports the frame member. The metal-air battery unit described in 1. The metal air battery unit according to any one of claims 1 to 6, wherein a plurality of the projecting pieces are provided on the side surface of the outer box with a space in the vertical direction.

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