JP4517415B2 - Power generation device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a power generation device that has a positive electrode and a negative electrode that face each other with an electrolyte layer interposed therebetween, and that reduces oxygen with the positive electrode.
[0002]
[Prior art]
2. Description of the Related Art In recent years, in the field of electronic devices, small portable electronic devices represented by portable small AV (audio / visual) devices, mobile phones, and portable information terminals are rapidly developing due to technological advances. Accordingly, as a portable power source used for them, development of a power generation device that has a high energy density and is small and can be used for a long time is required.
[0003]
Currently, secondary batteries are the mainstream of such power generation devices, and their research and development is actively underway. Recently, nickel-hydrogen secondary batteries have been rapidly improved in performance, or lithium ion secondary batteries have been put into practical use, and a certain level of performance has been obtained as a portable power source. However, depending on the type of portable electronic device used, the reality is that the sufficient continuous use time has not yet been guaranteed.
[0004]
Therefore, development of other power generation devices to replace secondary batteries is also expected. For example, as another power generation device having a high energy density, an air cell or a fuel cell can be cited. Among these, an air battery uses oxygen in the air as a positive electrode active material, and generates electricity by reacting oxygen and a metal constituting the negative electrode through an electrolyte membrane. Therefore, the air battery is characterized in that it does not require a positive electrode active material filling space and has a very high energy density as a whole battery. On the other hand, however, the air battery has a problem that the self-discharge rate is large because the alkaline electrolyte reacts with carbon dioxide in the air to cause deterioration over time. In addition, when the battery is exhausted, it cannot be charged like a normal secondary battery, so there is a problem that it is not suitable for a power source of a portable electronic device.
[0005]
In the fuel cell, the fuel supplied to the negative electrode is oxidized and separated into electrons and protons, and the protons move to the positive electrode and react with oxygen supplied to the positive electrode to generate electric power. Since such fuel cells directly convert the combustion energy of materials into electrical energy, the energy conversion efficiency is very high compared to general thermal power generation, etc., and the only thing that is generated during power generation is low pollution with only water. It has the characteristic of being sex. Further, unlike an air battery, it has a feature that it can be used continuously as long as fuel and oxygen are supplied. For this reason, development research has been conducted on fuel cells for large-scale power generation.
[0006]
Furthermore, in recent years, a fuel cell using a polymer solid electrolyte layer has been developed and can operate at a relatively low temperature of about room temperature to 90 ° C. As a result, not only for large-scale power generation but also for fuel cells, application to gradually smaller systems, such as application to power sources for driving automobiles, is considered.
[0007]
[Problems to be solved by the invention]
However, the fuel cell cannot continuously generate power unless oxygen and fuel are continuously supplied, and water is generated at the positive electrode during power generation, and oxygen is circulated adjacent to the positive electrode. It was also necessary to remove the water generated by the treatment. Therefore, conventionally, in a fuel cell, an oxygen supply mechanism that forcibly circulates and supplies oxygen to the positive electrode and a fuel supply mechanism that forcibly circulates and supplies fuel to the negative electrode are essential. There was a problem that the size was too large.
[0008]
Therefore, it is conceivable to reduce the size by removing the oxygen supply mechanism and the fuel supply mechanism that are forced to flow. At present, the power consumption of portable electronic devices is decreasing, and it is considered that the necessary power can be obtained by natural diffusion supply without forcibly circulating oxygen and fuel. It is thought that the water to be removed can be removed by natural evaporation.
[0009]
However, in that case, in order to efficiently supply oxygen by natural diffusion and remove water by natural evaporation, it is desirable that the positive electrode be positioned near the outer surface to facilitate contact with the outside air. Damage due to contact or degradation of performance becomes a problem. Further, in order to further reduce the size of the device, it is necessary to efficiently collect the generated charges. Furthermore, a structure different from the conventional one is required to supply the fuel to the negative electrode.
[0010]
The present invention has been made in view of such problems, and an object thereof is to provide a small power generation device that can be used as a portable power source.
[0011]
[Means for Solving the Problems]
A power generation device according to the present invention is provided with a positive electrode for reducing oxygen, a negative electrode provided opposite to the positive electrode via an electrolyte layer, and provided on the side opposite to the electrolyte layer of the positive electrode, and supplies outside air to the positive electrode The ventilation structure has a first protection part and a second protection part. The first protection part covers the surface of the positive electrode and allows outside air to pass therethrough. A plurality of first openings, and the second protection part is disposed between the first protection part and the positive electrode, and has a second opening at a position not overlapping the first opening. The outside air that has passed through the opening is supplied to the positive electrode from the second opening after passing between the first protective part and the second protective part.
[0014]
In the power generation device according to the present invention, the outside air that has passed through the first opening of the first protection portion passes between the first protection portion and the second protection portion, and is then provided in the second protection portion. The positive electrode is supplied from the second opening. Thereby, oxygen contained in the outside air is reduced at the positive electrode. That is, in the vent structure, along with the contact of the foreign matter is prevented for the positive electrode, oxygen is supplied to the positive electrode via a gap.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present embodiment will be described in detail with reference to the drawings.
[0018]
(First embodiment)
FIG. 1 shows an external configuration of the power generation device according to the first embodiment of the present invention. FIG. 2 shows a cross-sectional structure taken along line II of the power generation device shown in FIG. FIG. 3 is an enlarged view of a part of FIG. This power generation device includes, for example, a battery main body 10 and a fuel replenishment unit 20 having a fuel storage space 20a therein. In the battery body 10, for example, as illustrated in FIG. 2, a negative electrode 11 and a positive electrode 12 are provided to face each other with an electrolyte layer 13 interposed therebetween.
[0019]
The negative electrode 11 oxidizes the fuel and extracts electrons and protons from the fuel. For example, the negative electrode 11 has a structure in which a catalyst layer 11a and a gas permeable layer 11b are stacked in this order from the electrolyte layer 13 side. The catalyst layer 11a is made of, for example, carbon powder containing a catalyst. As the catalyst, for example, platinum (Pt) fine particles, or fine particles of transition metal such as iron (Fe), nickel (Ni), cobalt (Co) or ruthenium (Ru) and platinum or fine particles such as oxides are used. It is done. However, it is preferable that the catalyst is made of an alloy of ruthenium and platinum, since inactivation of the catalyst due to adsorption of carbon monoxide (CO) can be prevented. Further, the catalyst layer 11a may include fine particles of a resin used for the electrolyte layer 13 described later. This is to facilitate the movement of the generated protons. The gas permeable layer 11b is made of, for example, a thin film made of a porous carbon material, specifically, carbon paper or the like. A negative electrode terminal 11 c is disposed at the end of the negative electrode 11.
[0020]
The positive electrode 12 generates water by reacting electrons generated by reducing oxygen and protons generated in the negative electrode 11. For example, the positive electrode 12 has the same configuration as the negative electrode 11. That is, it has a structure in which a catalyst layer 12a made of carbon powder containing a catalyst and a gas permeable layer 12b made of a porous carbon material are laminated in order from the electrolyte layer 13 side. The catalyst used for the catalyst layer 12 a is the same as that of the negative electrode 11, and the catalyst layer 12 a may contain fine particles of the resin used for the electrolyte layer 13, as with the negative electrode 11. In the positive electrode 12, the catalyst layer 12a may include, for example, powdered polytetrafluoroethylene, or may include a coating layer (not shown) made of, for example, polytetrafluoroethylene on the opposite side of the gas permeable layer from the catalyst layer. . This is to promote the evaporation of water generated in the positive electrode 12. A positive electrode terminal 12 c is disposed at the end of the positive electrode 12.
[0021]
The electrolyte layer 13 is for transporting protons generated in the negative electrode 11 to the positive electrode 12 and is made of a material that does not have electron conductivity and can transport protons. For example, it is composed of a polyperfluorosulfonic acid resin film, specifically, a Nafion film manufactured by DuPont, a Flemion film manufactured by Asahi Glass, or an Aciplex film manufactured by Asahi Kasei Kogyo. In addition to the polyperfluorosulfonic acid-based resin film, the electrolyte layer 13 is made of a copolymer film of a trifluorostyrene derivative, a polybenzimidazole film impregnated with phosphoric acid, or an aromatic polyether ketone sulfonic acid film. You may make it comprise.
[0022]
On the opposite side of the negative electrode 11 from the electrolyte layer 13, for example, as shown in FIG. 2, a fuel holding portion 14 having a fuel storage space 14 a adjacent to the negative electrode 11 is provided. The fuel holding portion 14 is made of, for example, a hard plastic such as polytetrafluoroethylene, polystyrene, polypropylene, or polycarbonate. Moreover, it may be comprised with metal materials excellent in corrosion resistance, such as stainless steel and nickel metal. In addition, when comprised with a metal material, it is necessary to arrange | position the fuel holding part 14 so that the negative electrode 11 and the positive electrode 12 may not short-circuit, or to insert the insulating member which is not shown in order to prevent a short circuit .
[0023]
The fuel holding portion 14 is also formed with a fuel replenishing port 14b corresponding to the fuel replenishing portion 20 disposed adjacent thereto. The fuel replenishing portion 20 also has a fuel replenishing port 20b corresponding to the fuel replenishing port 14b. Thus, the storage space 14a of the fuel holding unit 14 and the storage space 20a of the fuel replenishing unit 20 are communicated with each other via the fuel replenishing ports 14b and 20b, respectively, and the fuel stored in the fuel replenishing unit 20 is communicated with the fuel holding unit 14. To be replenished. That is, in the present embodiment, a fuel supply unit is configured by the fuel holding unit 14 and the fuel replenishment unit 20, and the negative electrode 11 is caused by natural movement such as diffusion or flow in a closed space including the storage spaces 14a and 20a. To supply fuel.
[0024]
The fuel replenishing unit 20 is made of the same material as that of the fuel holding unit 14, and liquid fuel including methanol or formaldehyde or gaseous fuel including hydrogen gas is used as the fuel. Incidentally, the fuel replenishment section 20 is detachably disposed. When the storage spaces 14a and 20a run out of fuel, the fuel replenishment section 20 is removed and the storage space 20a is newly filled with fuel, and then disposed again. Alternatively, it can be replaced with a new fuel replenishing unit 20. For example, when hydrogen gas is used as the fuel, the fuel replenishment unit 20 may be filled not only with hydrogen gas but also with a hydrogen storage alloy.
[0025]
On the other hand, on the side opposite to the electrolyte layer 13 of the positive electrode 12, for example, as shown in FIG. 2, a ventilation structure 15 for supplying outside air to the positive electrode 12 by natural diffusion through a gap is provided. For example, as shown in an enlarged view in FIG. 3, the ventilation structure 15 includes a first protection part 16 having an opening 16a through which outside air passes, and a first protection part 16 and a positive electrode corresponding to the opening 16a. 12 and a second protective portion 17 having an opening 17a through which outside air passes.
[0026]
Among these, the 1st protection part 16 is for preventing primary that a foreign material contacts the positive electrode 12, and the 2nd protection part 17 is the positive electrode 12 from the 1st protection part 16 via the opening 16a. This is for the purpose of preventing the foreign matter that has entered the side from directly reaching the positive electrode 12 linearly. That is, in the present embodiment, the first protection unit 16 and the second protection unit 17 constitute a protection unit, thereby preventing foreign matter from directly reaching the positive electrode 12 while opening the opening. Outside air is supplied to the positive electrode 12 via 16a and 17a.
[0027]
The first protection part 16 is made of an insulating material such as polytetrafluoroethylene, polystyrene, polypropylene, or polycarbonate, for example. This is to prevent battery performance from being deteriorated due to electrical contact with external foreign matter. Moreover, the 1st protection part 16 is arrange | positioned so that the whole surface on the opposite side to the electrolyte layer 13 of the positive electrode 12 may be covered, and it is being fixed in the peripheral part. For example, the opening 16a has a shape extending in a strip shape in one direction, and a plurality of openings 16a are provided in parallel.
[0028]
Moreover, the 2nd protection part 17 is comprised by the closing member 17b provided so that the opening 17a might not overlap with the formation position of the opening 16a, and the supporting member 17c which supports this closing member, for example. The closing member 17b is made of an insulating material similar to that of the first protective member 16, for example. This is to prevent the battery performance from being deteriorated due to electrical contact with an external foreign object, similarly to the first protection unit 16. For example, the support member 17 c is provided corresponding to the opening 16 a and is disposed with respect to the positive electrode 12. As a result, as shown by the arrows in FIG. 3, it is possible to effectively prevent the foreign matter that has entered through the opening 16a from reaching the positive electrode 12 linearly.
[0029]
In addition, the support member 17c is made of, for example, a conductive material, and one end portion is extended to the positive electrode terminal 12c, and also has a function as a current collector. As the conductive material constituting the support member 17c, it is preferable to use a metal that is relatively resistant to corrosion, such as stainless steel or nickel metal. This is because water is generated in the positive electrode 12 and is easily corroded.
[0030]
The power generation device having such a configuration operates as follows.
[0031]
In this power generation device, fuel is replenished from the fuel replenishment unit 20 to the fuel holding unit 14 by movement due to nature, and fuel is supplied to the negative electrode 11. In the negative electrode 11, the fuel is oxidized and electrons and protons are extracted. Protons generated in the negative electrode 11 move to the positive electrode 12 through the electrolyte layer 13. Further, the outside air is supplied to the positive electrode 12 by natural diffusion through the gap of the ventilation structure 15. In the positive electrode 12, electrons generated by reduction of oxygen contained in the outside air react with protons that have moved from the negative electrode 11 to generate water. As a result, a potential difference is generated between the negative electrode 11 and the positive electrode 12 to generate power. At that time, the water generated in the positive electrode 12 is removed to the outside through the gap of the ventilation structure 15 by natural evaporation. Further, the electric charge generated in the positive electrode 12 is collected by the support member 17c which is a current collector.
[0032]
In this power generation device, the ventilation structure 15 is provided, and external air is supplied to the positive electrode 12 through the gap between the ventilation structure 15 and water is removed from the positive electrode 12. The contact of foreign matter to is prevented. Therefore, damage to the positive electrode and deterioration of the quality are prevented.
[0033]
As described above, according to the power generation device according to the present embodiment, since the ventilation structure 15 having the gap for supplying the outside air to the positive electrode 12 is provided, it is possible to prevent foreign matter from contacting the positive electrode 12. The outside air can be supplied to the positive electrode 12 by natural diffusion. Therefore, a mechanism for forcibly circulating oxygen with respect to the positive electrode 12 is not required, and downsizing can be achieved, and damage to the positive electrode 12 and deterioration of quality due to contact with foreign matter can be prevented.
[0034]
In addition, since the ventilation structure 15 is constituted by the first protection portion 16 and the second protection portion 17 so that the foreign matter does not directly reach the positive electrode 12 in a straight line, most foreign matters are effectively excluded. Can do.
[0035]
Furthermore, since the closing members 17b of the first protection part 16 and the second protection part 17 are made of an insulating material, it is possible to prevent battery performance from being deteriorated due to electrical contact with external foreign matter.
[0036]
In addition, since the support member 17c of the second protection portion 17 is made of a conductive material and has a function as a current collector, the charges generated in the positive electrode 12 can be efficiently collected. Therefore, the size can be further reduced.
[0037]
Furthermore, since the fuel is supplied to the negative electrode 11 by natural movement in the fuel holding unit 14 and the fuel replenishment unit 20, a mechanism for forcibly flowing the fuel to the negative electrode 11 is not required, and the size can be reduced. be able to.
[0038]
(Second Embodiment)
FIG. 4 shows the configuration of a power generation device according to the second embodiment of the present invention. This power generation device has the same configuration, operation, and function as those of the first embodiment except that the fuel replenishing unit 20 is removed and a lid 14c is disposed at the fuel replenishing port 14b of the fuel holding unit 14. Has an effect. Therefore, the same components are denoted by the same reference numerals, and detailed description thereof is omitted.
[0039]
In this power generation device, the storage space 14a inside the fuel holding portion 14 is closed by the lid 14c, and the fuel stored in the storage space 14a is supplied to the negative electrode 11 by natural movement. That is, in the present embodiment, the fuel holding unit 14 constitutes a fuel supply unit. Incidentally, the lid body 14c is detachably disposed, and when the storage space 14a runs out of fuel, the lid body 14c can be removed and fuel can be newly replenished from the fuel replenishing port 14b.
[0040]
The present invention has been described with reference to the embodiments. However, the present invention is not limited to the above-described embodiments, and various modifications can be made. For example, in each of the above-described embodiments, the case where the ventilation structure 15 is configured by the first protection portion 16 and the second protection portion 17 has been described. However, the ventilation structure 15 may have a gap for supplying outside air to the positive electrode 12. For example, other structures may be used. For example, the ventilation structure may be configured by one of the first protective layer 16 and the second protective layer 17, and a new third part together with the first protective part 16 and the second protective part 17. The protection unit may be added to the configuration. However, it is preferable that the protective portion can prevent foreign matter from directly contacting the positive electrode 12 in a straight line because contact of the foreign matter with the positive electrode 12 can be effectively prevented.
[0041]
In addition, the opening in the first protection part may have any shape. For example, the opening may be in an appropriate rectangular shape so that the first protection part has a lattice shape. In this case also, for example, a closing member is provided so that the opening of the first protection part and the opening of the second protection part do not overlap, and a support member is provided corresponding to the opening of the first protection part. In this case, it is preferable because contact of foreign matter with the positive electrode 12 can be effectively prevented.
[0042]
Further, in each of the above embodiments, the support member 17c is made of a conductive material, but it may be made of an insulating material in the same manner as the closing member 17b. In this case, unlike the above-described embodiments, the support member does not function as a current collector. Further, when the support member has a function as a current collector, at least part of the positive electrode 12 may be made of a conductive material.
[0043]
In addition, in each of the above embodiments, the case where the fuel replenishment unit 20 is extended in the extending direction of the negative electrode 11 and the positive electrode 12 and the fuel replenishment unit 20 is arranged in series with the battery body 10 is specifically illustrated. The present invention is similarly applied to the case where the battery body 10 and the fuel replenishment unit 20 have other arrangement positional relationships. For example, as shown in FIG. 5, the fuel replenishment unit 20 may be stacked and disposed on the fuel holding unit 14 side of the battery body 10. In addition, as shown in FIG. 6, the fuel replenishing portion 20 is extended in a direction perpendicular to the extending direction of the battery body 10 (that is, the extending direction of the negative electrode 11 and the positive electrode 12), and the fuel holding portion 14 of the battery body 10. A fuel replenishing unit 20 may be disposed on the side. At this time, the fuel replenishment section 20 may be disposed at the end of the fuel holding section 14 as shown in FIG. 6, or at the center of the fuel holding section 14 as shown in FIG. May be.
[0044]
Furthermore, in each of the above-described embodiments, the battery body 10 and the fuel replenishment unit 20 are connected adjacent to each other. However, the fuel replenishment port 14b of the fuel holding unit 14 and the fuel replenishment port 20b of the fuel replenishment unit 20 are connected. And the battery body 10 and the fuel replenishing unit 20 may be arranged apart from each other.
[0045]
In addition, in each of the above embodiments, the case where one battery body 10 is provided has been described, but the present invention is similarly applied to the case where two or more battery bodies 10 are provided. At this time, the two battery main bodies 10 may be stacked with the fuel holding portions 14 facing each other. In addition, the fuel replenishment part 20 may share the same thing with two battery main bodies, and you may make it equip each with another thing. Further, as shown in FIG. 8, when the two battery main bodies 10 are stacked, the fuel holding portion 14 may be shared between the two battery main bodies 10.
[0046]
Furthermore, in each of the above-described embodiments, a specific example of the fuel has been described. However, other fuels such as a liquid fuel containing acetic acid, formic acid, or carboxylic acid may be used.
[0047]
In addition, in each of the above-described embodiments, the case where the fuel supply unit that supplies fuel to the negative electrode 11 is provided has been described, but the present invention is also applied to the case where the fuel supply unit is not provided. For example, the negative electrode may be made of metal like an air battery.
[0048]
Furthermore, in each of the embodiments described above, the case where the ventilation structure 15 and the current collector are provided has been described. However, the present invention is also applied to the case where the ventilation structure 15 is not provided, This also applies to cases where they are not prepared. In addition, in each of the above embodiments, the case where a part of the ventilation structure 15 is caused to function as a current collector has been described. However, a current collector may be provided separately from the ventilation structure 15.
[0049]
【The invention's effect】
As described above, according to the power generation device according to any one of claims 1 to 9 , since the ventilation structure having the gap for supplying the outside air to the positive electrode is provided, the foreign matter is on the positive electrode. While preventing contact, outside air can be supplied to the positive electrode by natural diffusion. Therefore, there is no need for a mechanism for forcibly circulating oxygen to the positive electrode, the power generation device can be reduced in size, and the positive electrode can be prevented from being damaged and the quality can be prevented from being deteriorated due to contact with foreign matter. Play.
[0050]
In particular, according to the power generation device of the second aspect, since it is configured so that the foreign matter does not directly reach the positive electrode in a straight line, there is an effect that most of the foreign matter can be effectively eliminated.
[0051]
According to the power generation device of claim 4 or 6 , since the closing member of the first protection part or the second protection part is made of an insulating material, it is electrically connected to an external foreign object. There is an effect that the battery performance can be prevented from being lowered by the contact.
[0052]
Further, according to the power generation device of the fifth aspect , since at least a part of the support member in the second protection portion is made of the conductive material, the support member can have a function as a current collector. In addition, the charges generated in the positive electrode can be collected efficiently. Therefore, there is an effect that the power generation device can be further downsized.
[0054]
Furthermore, according to the power generation device according to any one of claims 7 to 9, since the fuel supply unit that supplies fuel to the negative electrode by movement due to nature is provided, the fuel is forced to the negative electrode. Therefore, there is no need for a mechanism for distributing the power generation device, and the power generation device can be reduced in size.
[Brief description of the drawings]
FIG. 1 is a perspective view illustrating an external configuration of a power generation device according to a first embodiment of the present invention.
2 is a cross-sectional view taken along the line II of the power generation device shown in FIG. 1. FIG.
3 is an enlarged cross-sectional view illustrating a part of FIG.
FIG. 4 is a cross-sectional view illustrating a configuration of a power generation device according to a second embodiment of the present invention.
FIG. 5 is a perspective view illustrating a modification of the present invention.
FIG. 6 is a perspective view illustrating another modification of the present invention.
FIG. 7 is a perspective view illustrating another modification of the present invention.
FIG. 8 is a cross-sectional view illustrating another modification of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Battery main body, 11 ... Negative electrode, 11a, 12a ... Catalyst layer, 11b, 12b ... Gas permeable layer, 11c ... Negative electrode terminal, 12 ... Positive electrode, 12c ... Positive electrode terminal, 13 ... Electrolyte layer, 14 ... Fuel holding part, 14a , 20a ... storage space, 14b, 20b ... fuel replenishment port, 14c ... lid, 15 ... vent structure, 16 ... first protection part, 16a, 17a ... opening, 17 ... second protection part, 17b ... closed Member, 17c ... support member, 20 ... fuel replenishment part

Claims (9)

A positive electrode for reducing oxygen;
A negative electrode provided opposite to the positive electrode with an electrolyte layer interposed therebetween;
A ventilation structure provided on a side opposite to the electrolyte layer of the positive electrode and having a gap for supplying outside air to the positive electrode, and a power generation device comprising:
The vent structure is
A first protection part and a second protection part, wherein the first protection part covers a surface of the positive electrode and has a plurality of first openings through which outside air can pass; The portion is disposed between the first protection portion and the positive electrode, and has a second opening at a position not overlapping the first opening, and the outside air passing through the first opening is the first After passing between the protective part and the second protective part, the positive electrode is supplied to the positive electrode from the second opening.
Power generation device.   The power generation device according to claim 1, wherein the ventilation structure prevents foreign substances from reaching the positive electrode directly in a straight line.   The power generation device according to claim 1, wherein the ventilation structure is provided to face the planar positive electrode.   The power generation device according to claim 1, wherein the first protection portion is made of an insulating material. The second protection unit is
A closure member having the second opening;
And supporting the closure member, and a support member disposed with respect to the positive electrode,
The power generation device according to claim 1, wherein at least a part of the support member is made of a conductive material.   The power generation device according to claim 5, wherein the closing member is made of an insulating material. The negative electrode oxidizes fuel and has an electrolyte layer between the negative electrode and the positive electrode,
The power generation device according to claim 1, further comprising a fuel supply unit that has a closed storage space for storing fuel and supplies fuel to the negative electrode by natural movement. The fuel supply unit
A fuel holding portion provided adjacent to the negative electrode;
The power generation device according to claim 7, further comprising a fuel replenishing unit that is detachably disposed while replenishing the fuel holding unit. The fuel supply unit
A fuel holding portion provided adjacent to the negative electrode and provided with an opening for replenishing fuel therein;
The power generation device according to claim 7, further comprising a lid that closes the opening of the fuel holding portion.

Images