JP2009021112A - Fuel cell - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve controllability of battery output by controlling a supply state of a fuel cell without complicating or large-sizing the fuel cell. <P>SOLUTION: The fuel cell 1 includes: the second electromotive part 2 equipped with a membrane-electrode assembly 18; the fuel housing part 3 which houses a liquid fuel; and a fuel control part 4 arranged between the electromotive part 2 and the fuel housing part 3. The fuel control part 4 includes: a fuel diffusion plate 27 having a needle part 26 of a penetration shape; a fuel control membrane 29 having a slit part 28 corresponding to the needle part 26; and a moving mechanism 30 which moves at least either the fuel diffusion plate 27 or the fuel control membrane 29. The fuel is supplied when the needle part 26 is inserted into the slit part 28 and the supply of the fuel is cut-off when the needle part 26 is separated from the slit part 27. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a fuel cell using liquid fuel.

  In recent years, in order to make it possible to use various portable electronic devices such as notebook computers and mobile phones without being charged for a long time, it has been attempted to use a fuel cell as a power source or a charger for these portable electronic devices. A fuel cell is characterized in that it can generate electric power simply by supplying fuel and air, and can generate electric power continuously for a long time if fuel is replenished. For this reason, if the fuel cell can be reduced in size, it can be said that the system is extremely advantageous as a power source or a charger for portable electronic devices.

  Direct methanol fuel cells (DMFCs) are promising as power sources and chargers for portable devices because they can be miniaturized and the fuel can be easily handled. As a liquid fuel supply method in the DMFC, an active method such as a gas supply type or a liquid supply type, or a passive method such as an internal vaporization type in which the liquid fuel in the fuel container is vaporized inside the cell and supplied to the fuel electrode is known. ing. Among these, a passive system such as an internal vaporization type is particularly advantageous for downsizing of the DMFC.

In the passive DMFC, for example, a structure in which an electromotive unit including a membrane electrode assembly having a fuel electrode, an electrolyte membrane, and an air electrode is arranged on the fuel storage unit has been proposed (see, for example, Patent Document 1). When the fuel vaporized from the fuel container is directly supplied to the fuel electrode, it is important to improve the controllability of the output of the fuel cell. However, the current passive DMFC does not always have sufficient output controllability. On the other hand, it has been studied to connect the electromotive part of the DMFC and the fuel storage part via a flow path, and to interpose a pump or the like in the flow path (see Patent Document 2). However, when a pump is used, there is a possibility that the apparatus becomes complicated and large.
International Publication No. 2005/112172 Pamphlet JP 2006-089552 A

  An object of the present invention is to provide a fuel cell in which the controllability of the cell output is improved by controlling the fuel supply state without increasing the complexity and size of the apparatus.

  A fuel cell according to an aspect of the present invention includes an electromotive unit including a membrane electrode assembly including a fuel electrode, an air electrode, and an electrolyte membrane sandwiched between the fuel electrode and the air electrode, and the membrane electrode junction A fuel storage part that is disposed on the fuel electrode side of the body and that is open toward the fuel electrode and that stores liquid fuel; and is disposed between the electromotive part and the fuel storage part, and passes therethrough. A fuel diffusion plate having a shaped needle portion; a fuel control membrane having a slit portion corresponding to the needle portion; and the fuel diffusion plate and the fuel control so as to change an insertion state of the needle portion with respect to the slit portion. And a fuel control unit that moves at least one of the membranes, the fuel control unit supplying the fuel to the fuel electrode when the needle unit is inserted into the slit unit, and the needle Part It is characterized by interrupting the supply of the fuel when it is disengaged from the slit portion.

  In the fuel cell according to the aspect of the present invention, the fuel is supplied from the fuel storage portion to the fuel electrode based on the state in which the needle portion of the fuel diffusion plate constituting the fuel control portion is inserted into the slit portion of the fuel control film. Is controlling. Therefore, it is possible to provide a fuel cell capable of controlling the battery output based on the fuel supply state without causing the device to become complicated or large.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view showing the configuration of an embodiment in which the fuel cell of the present invention is applied to a passive type (internal vaporization type) fuel cell (such as DMFC). A passive type fuel cell 1 shown in FIG. 1 includes an electromotive unit 2, a fuel storage unit 3, and a fuel control unit 4 interposed therebetween. Further, a gas-liquid separation layer 5 is disposed between the electromotive unit 2 and the fuel control unit 4.

  The electromotive unit 2 includes an anode (fuel electrode) 13 having an anode catalyst layer 11 and an anode gas diffusion layer 12, and a cathode (air electrode / oxidant electrode) 16 having a cathode catalyst layer 14 and a cathode gas diffusion layer 15. And a membrane electrode assembly (MEA) 18 composed of a proton (hydrogen ion) conductive electrolyte membrane 17 sandwiched between the anode catalyst layer 11 and the cathode catalyst layer 14.

  Examples of the catalyst contained in the anode catalyst layer 11 and the cathode catalyst layer 14 include a simple substance of a platinum group element such as Pt, Ru, Rh, Ir, Os, and Pd, and an alloy containing the platinum group element. For the anode catalyst layer 11, it is preferable to use Pt—Ru, Pt—Mo, or the like having strong resistance to methanol, carbon monoxide, or the like. Pt, Pt—Ni or the like is preferably used for the cathode catalyst layer 14. However, the catalyst is not limited to these, and various substances having catalytic activity can be used. The catalyst may be either a supported catalyst using a conductive support such as a carbon material or an unsupported catalyst.

  Examples of the proton conductive material constituting the electrolyte membrane 17 include fluorine-based resins (Nafion (trade name, manufactured by DuPont) and Flemion (trade name, manufactured by Asahi Glass Co., Ltd.) such as a perfluorosulfonic acid polymer having a sulfonic acid group. Etc.), organic materials such as hydrocarbon resins having sulfonic acid groups, or inorganic materials such as tungstic acid and phosphotungstic acid. However, the proton conductive electrolyte membrane 17 is not limited to these.

  The anode gas diffusion layer 12 laminated on the anode catalyst layer 11 serves to uniformly supply fuel to the anode catalyst layer 11 and has a current collecting function of the anode catalyst layer 11. The cathode gas diffusion layer 15 laminated on the cathode catalyst layer 14 serves to uniformly supply the oxidant to the cathode catalyst layer 14 and has a current collecting function of the cathode catalyst layer 14. The anode gas diffusion layer 12 and the cathode gas diffusion layer 15 are made of a porous substrate having conductivity such as carbon paper.

  The electromotive unit 2 is configured by sandwiching the MEA 18 as described above between an anode conductive layer (current collector) 19 and a cathode conductive layer (current collector) 20. The anode conductive layer 19 and the cathode conductive layer 20 are made of, for example, a mesh or a porous film made of a conductive metal material such as Au. The conductive layers (current collectors) 19 and 20 have through holes through which fuel, oxidant (air), and the like circulate. A rubber O-ring 21 is interposed between the electrolyte membrane 17 and the anode conductive layer 19 and between the electrolyte membrane 17 and the cathode conductive layer 20, and thereby, from the membrane electrode assembly (MEA) 18. Prevents fuel leaks and oxidizer leaks.

  A moisturizing layer 22 is laminated on the cathode conductive layer 20 of the electromotive unit 2, and a surface layer 23 is further laminated thereon. The surface layer 23 has a function of adjusting the amount of air that is an oxidizing agent. The amount of air taken in is adjusted by the number and size of the air inlets 24 formed in the surface layer 23. The moisturizing layer 22 is impregnated with a part of the water generated in the cathode catalyst layer 14, suppresses the transpiration of water, and introduces an oxidant uniformly into the cathode gas diffusion layer 15, thereby It promotes uniform diffusion of the oxidizing agent. The moisture retaining layer 22 is made of a porous material, and specifically, a porous body such as polyethylene or polypropylene is used.

  The fuel storage unit 3 stores liquid fuel corresponding to the electromotive unit 2. Examples of the liquid fuel include methanol fuels such as aqueous methanol solutions of various concentrations and pure methanol. The liquid fuel is not necessarily limited to methanol fuel. The liquid fuel may be, for example, an ethanol fuel such as an ethanol aqueous solution or pure ethanol, a propanol fuel such as a propanol aqueous solution or pure propanol, a glycol fuel such as a glycol aqueous solution or pure glycol, dimethyl ether, formic acid, or other liquid fuel.

  The fuel storage unit 3 is disposed on the anode 13 side of the MEA 18. The fuel storage unit 3 is opened on the anode 13 side, and a fuel control unit 4 and a gas-liquid separation layer 5 are sequentially installed between the opening and the electromotive unit 2. The fuel control unit 4 will be described in detail later. The gas-liquid separation layer 5 is a gas permselective membrane that transmits only the vaporized component of liquid fuel (such as methanol fuel) and does not transmit the liquid component. Examples of the constituent material of the gas-liquid separation layer 5 include a fluororesin such as polytetrafluoroethylene.

  Then, the fuel control unit 4, the gas-liquid separation layer 5, the electromotive unit 2, the moisturizing layer 22, and the surface layer 23 are sequentially laminated on the fuel storage unit 3, and further, for example, a stainless steel cover 25 is covered thereon. By holding this, the fuel cell 1 of this embodiment is configured. The cover 25 is provided with an opening at a portion corresponding to the air inlet 24 formed in the surface layer 23, thereby enabling the oxidant to be taken in and diffused to the cathode catalyst layer 14.

In the fuel cell 1 having the above-described configuration, liquid fuel such as methanol fuel in the fuel storage unit 3 is vaporized, and this vaporized component (fuel) passes through the fuel control unit 4 and the gas-liquid separation layer 5 to generate electricity. Supplied to section 2. In the electromotive unit 2, vaporized components such as methanol fuel are diffused in the anode gas diffusion layer 12 and supplied to the anode catalyst layer 11. The vaporized component supplied to the anode catalyst layer 11 causes an internal reforming reaction of methanol represented by the following formula (1).
CH ₃ OH + H ₂ O → CO ₂ + 6H ⁺ + 6e ⁻ (1)

Protons (H ⁺ ) generated by the internal reforming reaction are conducted through the electrolyte membrane 17 and reach the cathode catalyst layer 14. Air (oxidant) taken from the air inlet 24 of the surface layer 23 diffuses through the moisturizing layer 22, the cathode conductive layer 20, and the cathode gas diffusion layer 15 and is supplied to the cathode catalyst layer 14. The air supplied to the cathode catalyst layer 14 causes the reaction represented by the following formula (2). This reaction causes a power generation reaction that accompanies the generation of water.
(3/2) O ₂ + 6H ⁺ + 6e ⁻ → 3H ₂ O (2)

  As described above, the power generation reaction occurs by supplying fuel to the anode (fuel electrode) 13 of the MEA 18. In the fuel cell 1 of this embodiment, the fuel control unit 4 controls the supply of fuel from the fuel storage unit 3 to the fuel electrode 13. The fuel control unit 4 includes a fuel diffusion plate 27 having a plurality of penetrating needle portions 26, a fuel control film 29 having a plurality of slit portions 28 corresponding to the plurality of needle portions 26, and a slit portion of the needle portion 26. A moving mechanism 30 is provided for moving at least one of the fuel diffusion plate 27 and the fuel control film 29 so as to change the insertion state (insertion or non-insertion state) with respect to 28.

  The fuel control unit 4 shuts off the supply of fuel to the fuel electrode 13 when the needle part 26 is detached from the slit part 28 (FIG. 1), and when the needle part 26 is inserted into the slit part 28, the fuel electrode 4 13 is supplied with fuel (FIG. 2). The needle part 26 is detached from the slit part 28 in the initial state, and the supply of fuel is cut off. At the time of fuel supply, for example, the fuel diffusion plate 27 is moved toward the fuel control film 29 side, and thereby the needle portion 26 is inserted into the slit portion 28. When the needle part 26 is inserted into the slit part 28, the slit part 28 is opened, and fuel is supplied to the fuel electrode 13 through the needle part 26.

  The moving mechanism 30 that moves at least one of the fuel diffusion plate 27 and the fuel control film 29 is configured by using a piezoelectric element, a piezoelectric element, a shape memory alloy, a bimetal, or the like as an actuator. In this embodiment, a piezoelectric element that moves the fuel diffusion plate 27 toward the fuel control film 29 is used as the moving mechanism 30. The piezoelectric element is provided in a frame shape along the outer periphery of the fuel diffusion plate 27. In other words, the fuel diffusion plate 27 is fixed in the displacement direction (downward) of the frame-like piezoelectric element. By energizing the piezoelectric element, the fuel diffusion plate 27 moves toward the fuel control film 29. Further, by using a shape memory alloy or the like as the moving mechanism 30, the fuel diffusion plate 27 can be moved only by temperature control.

  The needle portion 26 protrudes from the fuel diffusion plate 27 toward the fuel control film 29. For example, as shown in FIG. 3, the needle portion 26 has a cross-shaped portion 26a inclined so as to reduce the diameter toward the projecting tip, and a through hole 26b provided along the cross-shaped portion 26a. Yes. As a constituent material of the fuel diffusion plate 27, a metal material or a resin material having excellent corrosion resistance can be applied. The constituent materials are not particularly limited, but the following materials are preferably applied in consideration of the methanol resistance of the fuel diffusion plate 27 and the needle portion 26, and the like.

  Resin materials include polyetheretherketone (PEEK), polyphenylene sulfide (PPS), polyetherimide (PEI), polyimide (PI), liquid crystal polymer (LCP), polybutylene terephthalate (PBT), polyethylene naphthalate (PEN) Examples thereof include olefin resins such as polyethylene terephthalate (PET), polyacetal (POM), and high density polyethylene (HDPE), and fluorine resins such as polytetrafluoroethylene (PTFE). Examples of the metal material include stainless steel materials such as SUS304 and SUS316, titanium, and a titanium alloy. It is preferable to apply a passivation treatment or the like as a surface treatment to these metal materials.

The fuel vaporized from the fuel storage part 3 is supplied to the fuel electrode 13 through the opened slit part 28 and the through hole 26b of the needle part 26. Therefore, a plurality of needle portions 26 are provided so that fuel can be supplied to the entire fuel electrode 13. Further, it is preferable that the needle portion 26 is provided uniformly on the fuel diffusion plate 27 in order to make the fuel supply amount in the plane of the fuel electrode 13 uniform. Specifically, it is preferable to uniformly provide the needle portions 26 in the range of 1 to 10 pieces / cm ^{2 with} respect to the fuel diffusion plate 27.

  The slit portion 28 provided in the fuel control film 29 controls the supply and shutoff of the fuel, and has a sealing function for shutting off the fuel supply when the needle portion 26 is not inserted. That is, the slit portion 28 is opened only when the needle portion 26 is inserted, and has a sealing function such that it is in close contact with the needle portion 26 when the needle portion 26 is not inserted and the closed state (fuel cutoff state) is maintained. . In order to provide such a sealing function, for example, as shown in FIG. 4, the slit portion 28 has a protruding portion 28 a protruding from the fuel control film 29 toward the fuel accommodating portion 3, and the protruding portion 28 a in the protruding direction. And a slit 28b to be divided. As the shape of the slit 28b, a cross shape shown in FIGS. 4 and 5, a single-letter shape shown in FIG. 6, or the like can be applied.

  The fuel control film 29 is preferably formed of an elastic member such as a thermoplastic elastomer or rubber so as to enhance the sealing function by the slit portion 28. Examples of the thermoplastic elastomer include styrene elastomer (TPS), olefin elastomer (TPO), polyester elastomer (TPEE), polyamide elastomer (PEBAX), silicone elastomer, and fluorine elastomer. Examples of rubber materials include ethylene-propylene-diene rubber (EPDM), acrylonitrile-butadiene rubber (NBR), hydrogenated nitrile rubber (HNBR), fluorine rubber (FKM), silicone rubber (VMQ), and fluorosilicone rubber (FVMQ). Can be mentioned. Among these, it is preferable to apply ethylene-propylene-diene rubber, fluorine rubber, silicone rubber or the like in consideration of the methanol resistance of the fuel control film 29 and the slit portion 28 and the like.

  Further, the slit portion 28 formed by forming the slit 28b in the protruding portion 28a protruded from the fuel control film 29 toward the fuel containing portion 3 is formed when the pressure in the fuel containing portion 3 rises based on the shape. Moreover, it has a non-return function which acts in the direction which seals between the fuel accommodating part 3 and the electromotive part 2. When the internal pressure of the fuel storage portion 3 rises, the pressure acts to close the slit 28b from the outer peripheral portion of the protruding portion 28a, so that the internal pressure of the fuel storage portion 3 is maintained. As a result, unnecessary fuel ejection to the electromotive unit 2 side, occurrence of problems associated therewith, and the like are suppressed.

  On the other hand, when the internal pressure on the electromotive unit 2 side increases, the pressure acts to open the slit 28b, so that the pressure on the electromotive unit 2 side can be released to the fuel storage unit 3 side. As a result, leakage of fuel from the fuel cell 1 can be prevented. When the internal pressure rises due to the fuel storage part 3 and the internal pressure rises of the fuel storage part 3 due to the pressure increase of the electromotive part 2, there is a risk of fuel leakage or the like. For this reason, the fuel storage unit 3 includes a release valve (internal pressure adjusting valve / not shown) that releases the internal pressure when the pressure rises above a certain value. As a result, abnormal operation of the fuel cell 1, leakage of fuel, and the like are prevented. The release valve can be provided in the fuel storage unit 3 itself or in a fuel supply port (coupler) for supplying liquid fuel to the fuel storage unit 3.

  Next, the fuel supply / cutoff operation will be described with reference to FIGS. FIG. 7 shows a state in which the needle part 26 is detached from the slit part 28, and the fuel supply from the fuel storage part 3 to the fuel electrode 13 is cut off based on the sealing function of the slit part 28. When the fuel diffusion plate 27 is moved toward the fuel control film 29 as shown in FIG. 8 from this state, the needle portion 26 is inserted into the slit portion 28. The slit portion 28 is opened based on the insertion of the needle portion 26, and fuel is supplied from the fuel storage portion 3 to the fuel electrode 13. FIG. 9 shows a state where the insertion depth of the needle portion 26 into the slit portion 28 is deeper than in FIG.

  Since the needle portion 26 is provided with an inclination that decreases in diameter toward the tip, the open state of the slit portion 28 changes based on the insertion depth into the slit portion 28. That is, the deeper the needle portion 26 is inserted into the slit portion 28, the larger the slit portion 28 is opened. Further, since the needle portion 26 has a penetrating shape corresponding to the inclination, the fuel supply path (supply area) by the coupling portion between the needle portion 26 and the slit portion 28 is increased as the needle portion 26 is inserted deeper into the slit portion 28. ) Increases. This means that the fuel supply amount can be controlled based on the insertion amount of the needle portion 26 with respect to the slit portion 28.

  As shown in FIG. 8, when the insertion amount (insertion depth) of the needle portion 26 with respect to the slit portion 28 is small, the fuel supply amount from the fuel storage portion 3 to the fuel electrode 13 is also small. On the other hand, when the needle part 26 is inserted deeper into the slit part 28 as shown in FIG. 9, the fuel supply path (supply area) by the joint part of the needle part 26 and the slit part 28 increases. It becomes possible to supply more fuel to the fuel electrode 13. As described above, in the fuel control unit 4, the fuel supply amount is controlled based on the inclination angle of the needle portion 26, the shape of the through hole (size of the through hole), the insertion amount of the needle portion 26 with respect to the slit portion 28, and the like. The

  In the fuel cell 1 of this embodiment, the fuel control unit 4 is configured by the fuel diffusion plate 27 having the needle portion 26, the fuel control film 29 having the slit portion 28, and the moving mechanism 30. Then, depending on the state of insertion of the needle part 26 into the slit part 28 (inserted or non-inserted state, the amount of insertion of the needle part 26 into the slit part 28, etc.) It is possible to control the shut-off state and further the amount of fuel supplied to the fuel electrode 13. Therefore, it is possible to control the fuel supply amount and the battery output based on the fuel supply amount without increasing the complexity and size of the apparatus as compared with the case where a pump or the like is used.

  In the embodiment described above, the needle part 26 provided with the through hole 26b along the cross-shaped part 26a is used. However, the shape of the needle part 26 is not limited to this. For example, as shown in FIG. 10, it is also possible to apply the needle part 31 which provided the through-hole 31b in the center of the inclination-shaped protrusion part 31a. Although the fuel supply amount cannot be controlled based on the insertion depth with respect to the slit portion 28 as in the needle portion 26 shown in FIG. 3, the needle portion 31 is not inserted into the slit portion 28 and the needle portion 3 is not inserted into the slit portion 28. The fuel supply and shutoff can be controlled based on the insertion state (FIG. 11). The fuel control unit 4 to which such a needle unit 31 is applied is also effective for on / off control of battery output.

  The present invention can be applied to various fuel cells using liquid fuel. The specific configuration of the fuel cell, the form of fuel supply, etc. are not particularly limited, and all of the fuel supplied to the MEA is supplied as liquid fuel vapor, all supplied as liquid fuel, or partly supplied in liquid state. The present invention can be applied to various forms such as liquid fuel vapor. In the implementation stage, the constituent elements can be modified and embodied without departing from the technical idea of the present invention. Furthermore, various modifications are possible, such as appropriately combining a plurality of constituent elements shown in the above embodiments, or deleting some constituent elements from all the constituent elements shown in the embodiments.

It is sectional drawing which shows the fuel cell by embodiment of this invention, Comprising: It is a figure which shows the state which stopped the fuel supply. It is a figure which shows the fuel supply state of the fuel cell shown in FIG. It is a figure which expands and shows the needle part of the fuel cell shown in FIG. 1, Comprising: (a) is a top view, (b) is sectional drawing. It is a figure which expands and shows the slit part of the fuel cell shown in FIG. 1, Comprising: (a) is a top view, (b) is sectional drawing. It is a perspective view which shows the structure of the fuel control film | membrane of the fuel cell shown in FIG. It is a perspective view which shows the other structure of a fuel control film | membrane. It is sectional drawing which shows operation | movement of the fuel control part in the fuel cell shown in FIG. 1, Comprising: It is a figure which shows the state by which the needle part is not inserted in the slit part. It is sectional drawing which shows operation | movement of the fuel control part in the fuel cell shown in FIG. 1, Comprising: It is a figure which shows the state which inserted the needle part in the slit part. It is sectional drawing which shows operation | movement of the fuel control part in the fuel cell shown in FIG. 1, Comprising: It is a figure which shows the state which inserted the needle part further into the slit part from the state shown in FIG. It is a figure which shows the other example of the needle part of the fuel cell shown in FIG. 1, Comprising: (a) is sectional drawing, (b) is a bottom view. It is a figure which shows the state which inserted the needle part shown in FIG. 10 in the slit part.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Fuel cell, 2 ... Electromotive part, 3 ... Fuel accommodating part, 4 ... Fuel control part, 5 ... Gas-liquid separation layer, 11 ... Anode catalyst layer, 12 ... Anode gas diffusion layer, 13 ... Anode (fuel electrode) , 14 ... Cathode catalyst layer, 15 ... Cathode gas diffusion layer, 16 ... Cathode (air electrode), 17 ... Electrolyte membrane, 18 ... MEA, 19 ... Anode conductive layer, 20 ... Cathode conductive layer, 26, 31 ... Needle part, 26a ... cross-shaped portion, 26b ... through hole, 27 ... fuel diffusion plate, 28 ... slit portion, 28a ... projection, 28b ... slit, 29 ... fuel control membrane, 30 ... moving mechanism.

Claims (7)

An electromotive part comprising a membrane electrode assembly having a fuel electrode, an air electrode, and an electrolyte membrane sandwiched between the fuel electrode and the air electrode;
A fuel containing portion that is disposed on the fuel electrode side of the membrane electrode assembly, opens toward the fuel electrode, and contains liquid fuel;
A fuel diffusion plate having a penetrating needle portion disposed between the electromotive portion and the fuel storage portion, a fuel control film having a slit portion corresponding to the needle portion, and the slit portion of the needle portion A fuel control unit including a movement mechanism for moving at least one of the fuel diffusion plate and the fuel control film so as to change an insertion state with respect to
The fuel control section supplies fuel to the fuel electrode when the needle section is inserted into the slit section, and shuts off the fuel supply when the needle section is detached from the slit section. A fuel cell. The fuel cell according to claim 1, wherein
The fuel control unit controls the supply amount of the fuel to the fuel electrode based on an insertion amount of the needle portion into the slit portion. The fuel cell according to claim 1 or 2,
The fuel cell according to claim 1, wherein the needle portion includes a cross-shaped portion inclined toward the tip, and a through hole provided along the cross-shaped portion. The fuel cell according to any one of claims 1 to 3, wherein
The slit portion has a check function that acts in a direction to seal between the fuel storage portion and the electromotive portion when the pressure in the fuel storage portion rises, and the fuel storage portion A fuel cell comprising: a release valve that releases an internal pressure of the fuel storage portion when the fuel cell rises above a certain value. The fuel cell according to any one of claims 1 to 4, wherein:
The fuel cell according to claim 1, wherein the slit portion includes a protrusion protruding from the fuel control film toward the fuel storage portion, and a slit provided in the protrusion. The fuel cell according to any one of claims 1 to 5, wherein
The fuel cell further comprises a gas-liquid separation layer disposed between the electromotive unit and the fuel control unit and allowing only a vaporized component of the liquid fuel vaporized from the fuel storage unit to pass therethrough. . The fuel cell according to any one of claims 1 to 6, wherein
The fuel cell according to claim 1, wherein the liquid fuel is methanol fuel.

Images