Metal-air battery module

Abstract

To provide a metal air battery module capable of securing air supply while suppressing deformation of a metal air battery.SOLUTION: A metal air battery module 1 includes a metal air battery cell 30, a plate member 20, and a fixing member 10. The metal air battery cell 30 includes a resin film with an opening and a water-repellent film arranged and welded so as to cover the opening. The plate member 20 is arranged to face the surface of the metal air battery cell 30 on which the opening is provided. The metal air battery cell 30 and the plate member 20 are fixed at their ends in the plane direction by the fixing members 10 arranged so as to be sandwiched in the plane direction along the surfaces facing each other.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a metal-air battery module including a metal-air battery cell, a plate member, and a fixing member. [Background technology]

[0002] In recent years, various batteries that utilize chemical reactions of electrode metals have been put to practical use, one example being the metal-air battery. Metal-air batteries are equipped with an air electrode (positive electrode) and a fuel electrode (negative electrode), and extract and utilize electrical energy obtained during an electrochemical reaction that converts metals such as zinc, iron, magnesium, aluminum, sodium, calcium, and lithium into metal oxides. When charging and discharging, heat is generated by the above-mentioned reactions, making it necessary to cool the metal-air battery. Therefore, methods for improving the cooling performance of metal-air batteries have been proposed (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2005-11787 Summary of the Invention [Problem to be solved by the invention]

[0004] The fluid-cooled battery pack system described in Patent Document 1 includes a battery pack case having a refrigerant inlet and a refrigerant outlet, a battery pack placed inside the battery pack case, and a refrigerant transport device that takes in refrigerant through the refrigerant inlet and discharges it from the refrigerant outlet through a refrigerant flow path. The battery pack is composed of multiple battery modules connected together, and the refrigerant flow paths between the battery modules are set to a target width.

[0005] In metal-air batteries, not only heat generation but also expansion and deformation may occur during battery operation. Therefore, in the above-mentioned fluid-cooled battery pack system, expansion and deformation may narrow the refrigerant flow path, which may result in deterioration of battery performance.

[0006] The present invention has been made to solve the above-mentioned problems, and aims to provide a metal-air battery module that can ensure air supply while suppressing deformation of the metal-air battery. [Means for solving the problem]

[0007] The metal-air battery module of the present invention is a metal-air battery module comprising a metal-air battery cell, a plate member, and a fixing member, wherein the metal-air battery cell has a film-like packaging material with an opening and a water-repellent film arranged and welded so as to cover the opening, the plate member is arranged opposite the surface of the metal-air battery cell on which the opening is provided, and the metal-air battery cell and the plate member are fixed at their surface ends in the surface direction by the fixing member which is arranged so as to sandwich them oppositely in the surface direction along the surfaces where they face each other.

[0008] In the metal-air battery module according to the present invention, the plate member may have a contact portion that contacts the metal-air battery cell, and the contact portion may have a first contact region and a second contact region that has a higher contact density than the first contact region.

[0009] In the metal-air battery module according to the present invention, the metal-air battery cell may be configured such that a water-repellent film welded portion where the water-repellent film is welded is provided along the periphery of the opening, the first contact area is provided in a position facing the opening, and the second contact area is provided in a position facing the water-repellent film welded portion.

[0010] In the metal-air battery module according to the present invention, a part of the fixing member may be provided in a position facing the water-repellent film welded portion.

[0011] In the metal-air battery module according to the present invention, the contact portion may be configured to be formed in a corrugated plate shape.

[0012] In the metal-air battery module according to the present invention, the ribs provided on the contact portions may be formed in a direction parallel to the air flow path.

[0013] In the metal-air battery module according to the present invention, the abutting portion may be a cylindrical protrusion.

[0014] In the metal-air battery module according to the present invention, the abutting portion may be a spindle-shaped convex portion.

[0015] In the metal-air battery module according to the present invention, the fixing member may be configured to hold an end of the plate member and fix the position thereof.

[0016] In the metal-air battery module according to the present invention, the plate member may have a through-hole passing through the plate member. [Effects of the Invention]

[0017] According to this invention, by fixing the metal-air battery cell and the plate member with the fixing member, it is possible to prevent deformation of the metal-air battery cell while ensuring air supply. [Brief explanation of the drawings]

[0018] [Figure 1] FIG. 1 is a perspective view showing a metal-air battery module according to a first embodiment of the present invention. [Figure 2] FIG. 1 is a front view showing a metal-air battery module according to a first embodiment of the present invention. [Figure 3] 1 is a side view showing a metal-air battery module according to a first embodiment of the present invention. [Figure 4] FIG. 1 is a front view of a metal-air battery cell. [Figure 5] FIG. 5 is a cross-sectional view of the metal-air battery cell shown in FIG. 4 taken along the arrow AA. [Figure 6] FIG. 1 is a front view of a metal-air battery cell. [Figure 7] 7 is a cross-sectional view of the metal-air battery cell shown in FIG. 6 taken along the arrow BB. [Figure 8] FIG. [Figure 9] FIG. [Figure 10] FIG. [Figure 11] FIG. [Figure 12] FIG. 2 is a perspective view showing a metal-air battery module according to a second embodiment of the present invention. [Figure 13] FIG. 3 is a front view showing a metal-air battery module according to a second embodiment of the present invention. [Figure 14] FIG. 3 is a side view showing a metal-air battery module according to a second embodiment of the present invention. [Figure 15] FIG. [Figure 16] FIG. [Figure 17] FIG. 10 is a perspective view showing a metal-air battery module according to a third embodiment of the present invention. [Figure 18] FIG. 10 is a front view showing a metal-air battery module according to a third embodiment of the present invention. [Figure 19] FIG. 10 is a side view showing a metal-air battery module according to a third embodiment of the present invention. [Figure 20] FIG. [Figure 21] FIG. DETAILED DESCRIPTION OF THE INVENTION

[0019] (First embodiment) A metal-air battery module according to a first embodiment of the present invention will be described below with reference to the drawings.

[0020] Fig. 1 is a perspective view showing a metal-air battery module according to a first embodiment of the present invention, Fig. 2 is a front view showing a metal-air battery module according to the first embodiment of the present invention, and Fig. 3 is a side view showing a metal-air battery module according to the first embodiment of the present invention. Note that Fig. 2 shows a part of a metal-air battery cell 30 in perspective, taking into consideration ease of viewing the drawing.

[0021] A metal-air battery module 1 according to a first embodiment of the present invention includes metal-air battery cells 30, plate members 20, and fixing members 10. In the metal-air battery module 1, the metal-air battery cells 30 and the plate members 20 are fixed at their surface edges in the surface direction (corresponding to the height direction Z described below) by fixing members 10 arranged to sandwich the metal-air battery cells 30 and the plate members 20 facing each other. Specifically, a pair of fixing members 10 are arranged opposite each other in the height direction Z of the metal-air battery module 1 and fix the upper and lower ends of the metal-air battery cells 30 and the plate members 20. In other words, the fixing members 10 hold the ends of the plate members 20 and fix their positions. In this embodiment, three metal-air battery cells 30 and four plate members 20 are arranged alternately in the thickness direction Y. However, the present invention is not limited to this; the number of metal-air battery cells 30 and plate members 20 may be set as appropriate, and the size of the fixing members 10 may be adjusted accordingly.

[0022] In the metal-air battery module 1, the side surfaces in the width direction X, which is perpendicular to the thickness direction Y, are open, allowing air to be supplied to the metal-air battery cells 30 arranged inside. Note that this is not limiting, and a housing or the like may be provided to cover the surface of the metal-air battery module 1, or openings may be provided on the side surfaces in the width direction X to allow air to enter the interior.

[0023] Next, the detailed structures of the metal-air battery cell 30, the plate member 20, and the fixing member 10 will be described with reference to the drawings.

[0024] FIG. 4 is a front view of the metal-air battery cell, and FIG. 5 is a cross-sectional view of the metal-air battery cell shown in FIG. 4 taken along the line AA.

[0025] 4 and 5 show the structure of a metal-air battery cell 30 that is used as a primary battery. The metal-air battery cell 30 has a battery case (exterior member) formed by bonding two resin films 31 (an example of packaging material) together. The resin film 31 contains an air electrode 33, an anode 34, and a separator 36, and is filled with an electrolyte (not shown). The resin film 31 on the side facing the air electrode 33 has an opening 311 located approximately in the center when viewed from the front, and a water-repellent film 37 is disposed to cover the opening 311. The resin film 31 has a water-repellent film welding portion 312 along the periphery of the opening 311, and the outer periphery of the water-repellent film 37 is welded to the water-repellent film welding portion 312. The resin film 31 on the side facing the anode 34 does not have an opening 311.

[0026] Within the resin film 31, the air electrode 33 and the negative electrode 34 are arranged in this order along the thickness direction Y. That is, the air electrode 33 is arranged facing one of the resin films 31, and the negative electrode 34 is arranged facing the other resin film 31. A separator 36 is arranged between the air electrode 33 and the negative electrode 34. The peripheral edge of the separator 36 may be bonded together with the peripheral edges of the two resin films 31.

[0027] The air electrode 33 comprises a current collector 331 and a catalyst layer 332 in contact with the current collector 331, and is a positive electrode having oxygen reduction ability and oxygen generation ability. A portion of the current collector 331 extends outside the packaging material to form a lead portion 333 of the metal-air battery cell 30. There are no particular restrictions on the material of the current collector 331 as long as it is a material commonly used in the field of metal-air batteries, and it is preferable that the thickness be 0.05 mm to 0.5 mm.

[0028] The catalyst layer 332 includes at least an air electrode catalyst. The air electrode catalyst is a catalyst that has at least oxygen reduction ability. Examples of the air electrode catalyst include conductive carbon such as ketjen black, acetylene black, denka black, carbon nanotubes, and fullerene, as well as metals, metal oxides, metal hydroxides, and metal sulfides. One or more of these may be used.

[0029] On the air catalyst, a three-phase interface where oxygen gas, water, and electrons coexist can be formed, allowing the discharge reaction to proceed. When the metal-air battery cell 30 is a primary battery, the catalyst layer 332 may contain a catalyst such as manganese dioxide. When the metal-air battery cell 30 is a secondary battery, the catalyst layer 332 may contain not only an air electrode catalyst with oxygen reduction ability, but also a catalyst with oxygen generation ability, or may have both oxygen reduction ability and oxygen generation ability. The thickness of the catalyst layer 332 is preferably 0.1 mm or more and 1.0 mm or less.

[0030] The negative electrode 34 is formed by laminating an active material layer 342 on a current collector 341. However, without being limited to this, the current collector 341 and particulate negative electrode active material (e.g., zinc or zinc oxide) may be separately added and laminated. Alternatively, the negative electrode 34 may include the current collector 341 and a colloidal slurry in which particles of the negative electrode active material and an electrolyte are mixed. In the slurry, the ratio of the weight of the electrolyte to the weight of the negative electrode active material is preferably 0.3 to 2.0.

[0031] The negative electrode active material is appropriately selected from materials commonly used in the field of metal-air batteries, and metal species such as cadmium, lithium, sodium, magnesium, lead, zinc, tin, aluminum, and iron can be used. The negative electrode active material is reduced upon charging, so it may be in the form of a metal oxide. The negative electrode active material has an average particle size of 1 nm to 300 μm, more preferably 100 nm to 250 μm, and particularly preferably 200 nm to 200 μm.

[0032] In the negative electrode 34 as well, a portion of the current collector 341 extends outside the packaging material and serves as a lead portion 343 for the metal-air battery cell 30 .

[0033] The metal-air battery cell 30 is not limited to the primary battery shown in FIGS. 4 and 5, but may also be a secondary battery shown in FIGS.

[0034] FIG. 6 is a front view of the metal-air battery cell, and FIG. 7 is a cross-sectional view of the metal-air battery cell shown in FIG. 6 taken along the arrow BB.

[0035] 6 and 7 show the structure of a metal-air battery cell 30 used as a secondary battery. The metal-air battery cell 30 has a battery case (exterior member) formed by bonding two resin films 31 (an example of packaging material). The resin film 31 contains an air electrode 33 (first positive electrode), an anode 34, a charging electrode 35 (second positive electrode), and two separators 36, and is filled with an electrolyte (not shown). The resin film 31 has an opening 311 located approximately in the center when viewed from the front, and a water-repellent film 37 is disposed to cover the opening 311. The resin film 31 has a water-repellent film welding portion 312 formed along the periphery of the opening 311, and the outer periphery of the water-repellent film 37 is welded to the water-repellent film welding portion 312.

[0036] Within the resin film 31, the air electrode 33, the negative electrode 34, and the charge electrode 35 are arranged in this order along the thickness direction Y. That is, the air electrode 33 is arranged facing one of the resin films 31, and the charge electrode 35 is arranged facing the other resin film 31. Separators 36 are arranged between the air electrode 33 and the negative electrode 34, and between the negative electrode 34 and the charge electrode 35, respectively. The peripheral edges of the two separators 36 may be bonded together with the peripheral edges of the two resin films 31.

[0037] The air electrode 33 and the negative electrode 34 have substantially the same configuration as those shown in Figures 4 and 5, and portions of the current collectors 331 and 341 extend outside the packaging material to form lead portions 333 and 343 of the metal-air battery cell 30.

[0038] The charging electrode 35 is composed of a current collector 351 and a catalyst layer 352. The catalyst layer 352 includes, for example, a conductive porous carrier and a charging electrode catalyst supported on the porous carrier. The charging electrode catalyst is a catalyst (such as nickel) that has oxygen generating ability, and promotes a charging reaction when the metal-air battery cell 30 is charged. The catalyst layer 352 is made of, for example, foamed nickel.

[0039] In the charging electrode 35 as well, a portion of the current collector 351 extends outside the packaging material and serves as a lead portion 353 for the metal-air battery cell 30 .

[0040] 6 and 7, the charging electrode 35 may be replaced with a second air electrode to form a primary battery. That is, in this configuration, air electrodes are disposed on both sides of the negative electrode 34. The second air electrode may be made of the same material as the other air electrode 33.

[0041] Fig. 8 is a perspective view of the fixing member, and Fig. 9 is a top view of the fixing member. Note that Fig. 9 schematically shows the metal-air battery cell 30 and plate member 20 supported by the fixing member 10, and only the end of the plate member 20 that is clamped by the claws 11 of the fixing member 10 is shown.

[0042] Figures 8 and 9 show one of a pair of fixing members 10. The other fixing member 10 has substantially the same structure as the fixing member 10 shown in Figures 8 and 9, so drawings and description thereof will be omitted. The fixing member 10 has a base portion located below (or above) the metal-air battery cell 30 and plate member 20, and claw portions 11 and side wall portions 12 extending upright from the base portion.

[0043] The claws 11 are formed long along the width direction X, and multiple claws 11 are provided at intervals in the thickness direction Y. Metal-air battery cells 30 and plate members 20 are arranged alternately between the claws 11 spaced apart in the thickness direction Y. The spacing between the claws 11 in the thickness direction Y is set appropriately according to the thickness of the metal-air battery cells 30 and plate members 20.

[0044] 2, the height of the claws 11 extending from the base is set so that they come just short of the opening 311 from the edge of the metal-air battery cell 30, and they face the water-repellent film welded portion 312. Therefore, the portion of the metal-air battery cell 30 that is supported by the fixing member 10 can be reliably prevented from deforming at the water-repellent film welded portion 312 by the fixing member 10.

[0045] The side wall portions 12 are provided at both ends of the base portion that face each other in the width direction X. In the portion of the side wall portion 12 that corresponds to the plate member 20, one end side facing in the width direction X is open so that the plate member 20 can be inserted from the open end side.

[0046] FIG. 10 is a perspective view of the plate member, and FIG. 11 is a front view of the plate member.

[0047] The plate member 20 has a contact portion that contacts the metal-air battery cell 30, and this contact portion is provided with a first contact region and a second contact region that has a higher contact density than the first contact region. The first contact region is provided in a position facing the opening, and the second contact region is provided in a position facing the water-repellent film welded portion. In this embodiment, the contact portion is molded into a corrugated plate shape. To distinguish this embodiment from the second and third embodiments described below, the first contact region will be referred to as the sparse wave portion 21B and the second contact region will be referred to as the dense wave portion 21A.

[0048] The upper and lower ends of the plate member 20 that are supported by the fixing member 10 are formed flat, with the center in the height direction Z serving as the abutment portion. The ridges on the abutment portion are formed in a direction parallel to the air flow path and along the width direction X. In this way, air flows through the ridges on the abutment portion, allowing air to be efficiently taken into the metal-air battery cell 30.

[0049] The coarse wave section 21B has a corrugated shape where the ribs are bent so that the spacing between them is wider, while the dense wave section 21A has a corrugated shape where the spacing between the ribs is narrower than that of the coarse wave section 21B. Thus, the difference in spacing between the ribs between the coarse wave section 21B and the dense wave section 21A results in different contact densities. Specifically, in the coarse wave section 21B, the spacing between the convex portions protruding on the same surface is preferably 5 mm to 15 mm, and more preferably 7 mm to 9 mm. In the dense wave section 21A, the spacing is preferably about twice as dense as that of the coarse wave section 21B, and the spacing between the convex portions is preferably 2.5 mm to 5 mm. In the coarse wave section 21B and the dense wave section 21A, the corners of the waves may be rounded to form a smooth shape. This prevents damage to the surface of the metal-air battery cell 30, such as the water-repellent film 37, that comes into contact with it.

[0050] The water-repellent film welded portion 312, where different materials are welded, may peel off due to expansion and deformation. Peeling between the water-repellent film 37 and the resin film 31 causes electrolyte leakage from that area, impeding airflow. Therefore, even if the metal-air battery cell 30 itself expands, the water-repellent film welded portion 312 must be held down to minimize deformation. In this embodiment, when the metal-air battery cell 30 and plate member 20 are fixed with the fixing member 10, the fixing member 10 abuts against the water-repellent film welded portions 312 at the upper and lower ends of the metal-air battery cell 30, and the dense corrugated portion 21A abuts against the water-repellent film welded portions 312 at the side ends (left and right in Figure 2). However, if the surface of the metal-air battery cell 30 (particularly the inside of the opening 311) is blocked, airflow will be impeded. Therefore, by creating a difference in contact density at the abutting portion, it is possible to suppress expansion of the metal-air battery cell 30 and ensure an air flow path, while also assisting in the intake of air into the metal-air battery cell 30.

[0051] The coarse wave section 21B has through holes 22 that penetrate the plate member 20 in the thickness direction Y. By providing the through holes 22 in this way, air can flow back and forth through the through holes 22, further promoting the supply of air. Furthermore, when the temperature of the metal-air battery cells 30 rises due to battery operation, the air between the metal-air battery cells 30 generates an ascending air current through the through holes 22. The upward air flow escapes from both upper ends of the plate member 20, and at the same time, air flows in from both lower ends of the plate member 20 due to the chimney effect. In this embodiment, the diameter of the through holes 22 is set to φ1.0 mm to 2.0 mm. The diameter, number, and density of the through holes 22 can be appropriately designed taking into account the strength of the plate member 20 itself.

[0052] As shown in FIGS. 1 to 3, by fixing the metal-air battery cell 30 and the plate member 20 with the fixing member 10, it is possible to prevent deformation of the metal-air battery cell 30 while ensuring air supply.

[0053] As described above, by creating a difference in contact density at the abutment portion, it is possible to suppress expansion of the metal-air battery cell 30, ensure an air flow path, and assist in the intake of air into the metal-air battery cell 30.

[0054] In the metal-air battery cell 30, the contents tend to accumulate at the bottom due to their own weight and expand, but because the plate member 20 is arranged upright along its surface, it is possible to create a structure in which the plate member 20 is likely to come into contact with the metal-air battery cell 30 at the bottom and is unlikely to come into contact with the metal-air battery cell 30 at the top. This allows the expansion of the metal-air battery cell 30 to escape upward while ensuring an air flow path.

[0055] (Second embodiment) Next, a metal-air battery module according to a second embodiment of the present invention will be described with reference to the drawings.

[0056] Fig. 12 is a perspective view showing a metal-air battery module according to a second embodiment of the present invention, Fig. 13 is a front view showing a metal-air battery module according to the second embodiment of the present invention, and Fig. 14 is a side view showing a metal-air battery module according to the second embodiment of the present invention. Note that Fig. 13 shows a part of a metal-air battery cell 30 in perspective, taking into consideration ease of viewing the drawing.

[0057] The second embodiment differs from the first embodiment in the shape of the plate member 20. Since the second embodiment has substantially the same configuration as the first embodiment shown in Figures 1 to 11, explanations of the metal-air battery cells 30 and fixing members 10 will be omitted and only the plate member 20 will be explained.

[0058] FIG. 15 is a perspective view of the plate member, and FIG. 16 is a front view of the plate member.

[0059] The plate member 20 has a contact portion that contacts the metal-air battery cell 30, and in this embodiment, the contact portion is a cylindrical protrusion. That is, in this embodiment, the plate member 20 is a flat plate, and protrusions are provided in locations that correspond to the contact portions. In this embodiment, the protrusion that corresponds to the first contact area is called the first cylindrical protrusion 21D, and the protrusion that corresponds to the second contact area is called the second cylindrical protrusion 21C.

[0060] The plate member 20 does not have abutment portions at its upper and lower ends, which are supported by the fixing member 10, but has abutment portions at its center in the height direction Z. The first cylindrical protrusion 21D and the second cylindrical protrusion 21C preferably have a diameter of φ0.8 mm to 1.2 mm, and in this embodiment, the diameter is φ1.0 mm. The protruding height of the first cylindrical protrusion 21D and the second cylindrical protrusion 21C may be set appropriately depending on the distance from the metal-air battery cell 30. The tips of the first cylindrical protrusion 21D and the second cylindrical protrusion 21C may be rounded or have smooth corners to prevent damage to the water-repellent film 37 or other surfaces that they come into contact with.

[0061] The first cylindrical protrusions 21D are arranged at intervals of 5 mm to 15 mm in the width direction X and the height direction Z. The second cylindrical protrusions 21C are arranged in a staggered pattern at intervals of 2.5 mm along the height direction Z. However, this is not limiting, and the number of second cylindrical protrusions 21C may be adjusted depending on the size of the second contact region, and they may be arranged more densely than the first cylindrical protrusions 21D. In this way, by differentiating the density at which the first cylindrical protrusions 21D and the second cylindrical protrusions 21C are arranged, the contact density at the contact region can be made different.

[0062] In this embodiment, the first contact region is provided with through-holes 22. The through-holes 22 may be disposed at positions that do not overlap with the first cylindrical protrusions 21D.

[0063] (Third embodiment) Next, a metal-air battery module according to a third embodiment of the present invention will be described with reference to the drawings.

[0064] Fig. 17 is a perspective view showing a metal-air battery module according to a third embodiment of the present invention, Fig. 18 is a front view showing a metal-air battery module according to the third embodiment of the present invention, and Fig. 19 is a side view showing a metal-air battery module according to the third embodiment of the present invention. Note that Fig. 18 shows a part of a metal-air battery cell 30 in perspective, taking into consideration ease of viewing the drawing.

[0065] The third embodiment differs from the first embodiment in the shape of the plate member 20. Since the third embodiment has substantially the same configuration as the first and second embodiments shown in Figures 1 to 16, explanations of the metal-air battery cells 30 and fixing members 10 will be omitted, and only the plate member 20 will be explained.

[0066] FIG. 20 is a perspective view of the plate member, and FIG. 21 is a front view of the plate member.

[0067] The plate member 20 has a contact portion that contacts the metal-air battery cell 30, and in this embodiment, the contact portion is a spindle-shaped convex portion. In other words, the third embodiment differs from the second embodiment in the shape of the convex portion provided on the plate member 20. In this embodiment, the convex portion corresponding to the first contact area is called the first spindle convex portion 21F, and the convex portion corresponding to the second contact area is called the second spindle convex portion 21E.

[0068] The plate member 20 does not have abutment portions at its upper and lower ends that are supported by the fixing member 10, but has abutment portions at its center in the height direction Z. The first spindle convex portion 21F and the second spindle convex portion 21E are formed wide in the width direction X, and their lengths are preferably 5 mm to 15 mm. The protruding height of the first spindle convex portion 21F and the second spindle convex portion 21E may be set appropriately depending on the distance from the metal-air battery cell 30. The tips of the first spindle convex portion 21F and the second spindle convex portion 21E may be spherically shaped or have rounded corners to prevent damage to the water-repellent film 37 or other surfaces that they come into contact with.

[0069] The first spindle convex portions 21F are arranged in a row at intervals of 5 mm to 15 mm in the width direction X and the height direction Z. The second spindle convex portions 21E are arranged in a row at intervals of 2.5 mm along the height direction Z. However, this is not limiting, and the number of second spindle convex portions 21E provided can be adjusted depending on the size of the second contact region, and they can be arranged more densely than the first spindle convex portions 21F. In this way, by differentiating the density at which the first spindle convex portions 21F and the second spindle convex portions 21E are arranged, the contact density at the contact portion can be made different.

[0070] In this embodiment, the wide spindle-shaped protrusions have greater mechanical strength than cylindrical protrusions. Furthermore, the cross-sectional area in the height direction Z is smaller than in the width direction X, which reduces air flow resistance. Furthermore, the first spindle-shaped protrusions 21F are arranged so that the spacing between them is wider in the height direction Z than in the width direction X. By widening the spacing in the height direction Z, the air flow path is not blocked, allowing air to be efficiently introduced into the metal-air battery cell 30.

[0071] In this embodiment, the first contact region is provided with through-holes 22. The through-holes 22 may be disposed at positions that do not overlap with the first spindle convex portions 21F.

[0072] It should be noted that the embodiments disclosed herein are illustrative in all respects and are not intended to be limiting. Therefore, the technical scope of the present invention should not be interpreted solely by the above-described embodiments, but should be defined by the claims. Furthermore, all modifications within the scope and meaning equivalent to the claims are included. [Explanation of symbols]

[0073] 1. Metal-air battery module 10 Fixing member 11 Claw 12 Side wall 20 Plate members 21A Dense wave part 21B Sparse part 21C Second cylindrical protrusion 21D First cylindrical protrusion 21E Second spindle convex part 21F First spindle convex part 22 Through hole 30 Metal-air battery cells 31 Resin film (an example of packaging material) 311 Aperture 312 Water-repellent film welding part 33 Air electrode 34 Negative electrode 35 charging pole 36 Separator 37 Water-repellent film X Width direction Y thickness direction Z height direction

Claims

1. A metal-air battery module including a metal-air battery cell, a plate member, and a fixing member, The metal-air battery cell has a film-like packaging material with an opening and a water-repellent film disposed and welded to cover the opening, the plate member is disposed opposite the surface of the metal-air battery cell on which the opening is provided, The metal-air battery cell and the plate member are fixed at their surface ends in the surface direction by the fixing member, which is arranged so as to sandwich the metal-air battery cell and the plate member in a face-to-face direction along the surfaces where the two are facing each other. A metal-air battery module characterized by:

2. The metal-air battery module according to claim 1, the plate member has a contact portion that contacts the metal-air battery cell, The contact portion has a first contact area and a second contact area having a higher contact density than the first contact area. A metal-air battery module characterized by:

3. The metal-air battery module according to claim 2, The metal-air battery cell has a water-repellent film welding portion where the water-repellent film is welded along the periphery of the opening, the first contact area is provided at a position facing the opening, The second contact area is provided at a position facing the water-repellent film welding portion. A metal-air battery module characterized by:

4. The metal-air battery module according to claim 3, A part of the fixing member is provided at a position facing the water-repellent film welding portion. A metal-air battery module characterized by:

5. The metal-air battery module according to any one of claims 2 to 4, The contact portion is formed in a corrugated shape. A metal-air battery module characterized by:

6. The metal-air battery module according to claim 5, The ribs provided on the contact portion are formed in a direction parallel to the air flow path. A metal-air battery module characterized by:

7. The metal-air battery module according to any one of claims 2 to 4, The contact portion is a cylindrical protrusion. A metal-air battery module characterized by:

8. The metal-air battery module according to any one of claims 2 to 4, The contact portion is a spindle-shaped convex portion. A metal-air battery module characterized by:

9. The metal-air battery module according to any one of claims 1 to 8, The fixing member holds the end of the plate member and fixes its position. A metal-air battery module characterized by:

10. The metal-air battery module according to any one of claims 1 to 9, The plate member has a through hole passing through it. A metal-air battery module characterized by:

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