Portable Passive Direct Methanol Fuel Cell System

Abstract

The present invention discloses a portable passive direct methanol fuel cell system, comprising a first and a second assembly, a membrane electrode, a water-absorbing resin assembly and a switch mechanism, wherein the first assembly has a mounting surface, mesh holes are arranged on the mounting surface, the membrane electrode is mounted on the inner side of the mounting surface, and the cathode end of the membrane electrode faces the mesh holes; the water-absorbing resin assembly comprises a water-absorbing resin and a storage box body, the front side of the storage box body is a porous structure, the storage box body and the switch mechanism are mounted in an assembly space composed of the first and second assemblies, the switch mechanism can drive the storage box body to move toward the membrane electrode, so that the water-absorbing resin passes through the porous structure and is close to the anode end of the membrane electrode, the switch mechanism can separate the water-absorbing resin from the membrane electrode, and the water-absorbing resin is used to continuously provide methanol fuel that meets the power generation requirements of the membrane electrode. The present invention optimizes the structure of the fuel cell system, greatly reduces the product volume, is easy to carry, and can be well used as a power bank.

Description

Technical Field

[0001] The present invention relates to the technical field of fuel cells, and in particular to a portable and miniaturized passive direct methanol fuel cell system. Background Art

[0002] Direct methanol fuel cells have the advantages of high energy density, simple structure and easy fuel replenishment, and are therefore seen as one of the most promising new energy sources for application in the field of portable power.

[0003] After decades of development by several companies, it can now run stably for thousands of hours. However, the low operating temperature of the battery, the use of a large amount of precious metal catalysts and thick perfluorosulfonic acid proton exchange membranes, and the complex cathode drainage structure have led to high costs, significant performance degradation during operation, and short maintenance intervals, which seriously restrict its promotion and application.

[0004] Passive direct methanol fuel cell (passive DMFC) has become a fuel cell technology widely studied as a laptop power source due to its high energy density, good reliability, and good portability. CN108615919A discloses a passive direct methanol fuel cell system, which uses high-quality metal materials to be corroded into a porous grid structure as the anode plate and cathode plate of the direct methanol fuel cell, and embeds the second heat pipe of the super wave inside the cathode plate and the anode plate; the cathode plate and the anode plate are plated with gold and platinum (or other alloy materials) by sputtering, which not only has better hydrophilicity, but also can reduce internal resistance and improve the performance of the passive direct methanol fuel cell system; the methanol chamber, membrane electrode, cathode current collecting plate, mass transfer barrier layer, and temperature control valve are packaged into a passive direct methanol fuel cell through bonding technology of materials such as ODMS, and finally the catalyst heating system and the insulation shell are integrated into the passive direct methanol fuel cell system to form a passive direct methanol fuel cell system based on methanol combustion catalytic heating; this system improves the output performance and dynamic response characteristics of the passive direct methanol fuel cell system; but due to its structural complexity, the volume and cost of the fuel cell are increased. Summary of the invention

[0005] In order to solve the above technical problems, the present invention proposes a portable passive direct methanol fuel cell system, which optimizes the structure of the fuel cell system, greatly reduces the product volume, is easy to carry, and can be used as a power bank.

[0006] The technical solution of the present invention is achieved in this way:

[0007] A portable passive direct methanol fuel cell system comprises a first assembly, a second assembly, a membrane electrode, a water-absorbing resin assembly and a switch mechanism, wherein the first assembly has a mounting surface, on which a plurality of mesh holes for improving the gas supply to the cathode end of the membrane electrode are arranged, the membrane electrode is mounted on the inner side of the mounting surface, and the cathode end of the membrane electrode faces the mesh holes; the water-absorbing resin assembly comprises a water-absorbing resin and a storage box body, the water-absorbing resin is positioned and accommodated in the storage box body, the front side of the storage box body is a porous structure, the first assembly and the second assembly The storage box body and the switch mechanism are assembled together to form an outer shell with an assembly space, the storage box body and the switch mechanism are installed in the assembly space, the switch mechanism can drive the storage box body to move toward the anode end of the membrane electrode, so that the water-absorbing resin in the storage box body passes through the porous structure and adheres to the anode end of the membrane electrode, and the switch mechanism can drive the storage box body away from the anode end of the membrane electrode, so that the water-absorbing resin in the storage box body is separated from the anode end of the membrane electrode, and the water-absorbing resin is used to continuously provide methanol fuel that meets the power generation requirements of the membrane electrode.

[0008] Furthermore, the switch mechanism includes a slider, a driving member and a return spring, the slider includes a slider body and a flange ring formed at the outer end of the slider body, a stepped slot is formed on the rear side wall of the second assembly body facing the storage box body, the slider is slidably arranged in the stepped slot, the return spring is positioned between the flange ring of the slider and the step of the stepped slot, the storage box body is slidably arranged in the assembly space, and is fixedly connected to the inner end of the slider body, the driving member is installed in the stepped slot, and can drive the outer end of the slider body to move inward.

[0009] Furthermore, the switch mechanism includes a slider, a driving member and a return spring, a partition is formed in the assembly space, a through hole is formed on the partition, a guide sleeve is formed on the side wall of the second assembly body facing the through hole, the slider includes a slider body and a flange ring formed on the outer end of the slider body, the slider is slidably arranged in the through hole, and the flange ring is located between the partition and the guide sleeve, the return spring is sleeved on the slider body and arranged between the flange ring and the partition, the storage box body is slidably arranged in the assembly space, and is fixedly connected to the inner end of the slider body, the driving member is installed in the guide sleeve, and can drive the outer end of the slider body to move inward.

[0010] Furthermore, the switch mechanism includes a fixed rod, a toggle rod, a sliding rod and a connecting piece, the top of the fixed rod is installed on the top wall of the assembly space and is parallel to the storage box body, the sliding rod is arranged perpendicular to the storage box body, one end of the sliding rod is fixedly connected to the position of the fixed rod near the top, and the other end of the sliding rod is slidably passed through a through hole on the toggle rod near the top; one end of the connecting piece is rotatably connected to the storage box body through a first pin shaft, and the other end of the connecting piece is pivotally connected to the bottom end of the fixed rod through a second pin shaft, a waist-shaped slide groove is formed in the middle part of the connecting piece, a third pin shaft is passed through the waist-shaped slide groove, the bottom end of the toggle rod is fixedly connected to the third pin shaft, and the top end of the toggle rod passes through the top wall of the assembly space.

[0011] Furthermore, an electrical output interface for charging electronic products and a current and voltage control unit for controlling the electrical output of the membrane electrode are formed on the outer shell.

[0012] Furthermore, a fuel inlet is formed on the outer shell, the fuel inlet is connected to the water-absorbing resin through a fuel flow channel, and a plug is installed in the fuel inlet.

[0013] Furthermore, a methanol barrel is provided in the assembly space, the water-absorbing resin is connected to the methanol barrel through a pipeline, a feeding port is formed on the outer shell, the feeding port is connected to the methanol barrel through a fuel flow channel, and a sealing plug is installed in the feeding port.

[0014] Furthermore, the water-absorbing resin is one of acrylic acid, acrylamide, polyvinyl alcohol, polyethylene oxide, starch grafted acrylate polymer cross-linked product and acrylamide-acrylate copolymer cross-linked product.

[0015] Furthermore, the water absorption rate of the water-absorbing resin is 30-70%.

[0016] The beneficial effects of the present invention are as follows: the present invention proposes a portable passive direct methanol fuel cell system, by directly attaching the membrane electrode to the inner side of the mounting surface of the first assembly, forming a mesh on the mounting surface of the first assembly, and utilizing the self-flow driven by the oxygen concentration gradient to realize gas supply, thereby forming a passive open cathode structure, and no cathode plate is required, thereby simplifying the cathode end structure of the fuel cell; by arranging the water-absorbing resin in a storage box body, and driving the storage box body to move back and forth by the switch mechanism, the water-absorbing resin can be made to adhere to the anode end of the membrane electrode installed on the first assembly through the porous structure of the storage box body, so that the water-absorbing resin can be used to continuously provide methanol fuel that meets the power generation requirements of the membrane electrode, forming a passive anode end, and no anode plate is required, thereby simplifying the anode end structure of the fuel cell; compared with the prior art, the cathode end and the anode end of the fuel cell of the present invention are both designed to be passive, which not only simplifies the structure of the fuel cell, greatly reduces the product volume, and is easy to carry, but also greatly reduces the cost of the fuel cell, and can be well used as a power bank. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic structural diagram of a preferred embodiment 1 of a portable passive direct methanol fuel cell system of the present invention (a state where a water-absorbing resin is in contact with a membrane electrode);

[0018] Figure 2 This is a schematic structural diagram of a preferred embodiment 1 of a portable passive direct methanol fuel cell system of the present invention (a state where the water-absorbing resin is not in contact with the membrane electrode);

[0019] Figure 3 for Figure 2 The enlarged structural diagram at A in the middle;

[0020] Figure 4 A perspective view of a preferred embodiment 1 of a portable passive direct methanol fuel cell system of the present invention;

[0021] Figure 5 It is a structural schematic diagram of a preferred embodiment 2 of the portable passive direct methanol fuel cell system of the present invention (the contact state between the water-absorbing resin and the membrane electrode);

[0022] Figure 6 This is a schematic structural diagram of a preferred embodiment 2 of a portable passive direct methanol fuel cell system of the present invention (a state where the water-absorbing resin is not in contact with the membrane electrode);

[0023] Figure 7 A stereogram of a preferred embodiment 3 of the portable passive direct methanol fuel cell system of the present invention (a state where the water-absorbing resin is in contact with the membrane electrode);

[0024] Figure 8It is a front view of the preferred embodiment 3 of the portable passive direct methanol fuel cell system of the present invention (the contact state between the water-absorbing resin and the membrane electrode);

[0025] Fig. 9 for Figure 8 Middle AA section view;

[0026] Fig.10 This is a schematic diagram of the internal structure of the preferred embodiment 3 of the portable passive direct methanol fuel cell system of the present invention (the state where the water-absorbing resin is in contact with the membrane electrode); DETAILED DESCRIPTION

[0027] In order to more clearly understand the technical content of the present invention, the following embodiments are described in detail, the purpose of which is only to better understand the content of the present invention but not to limit the scope of protection of the present invention. The components in the structure of the embodiment drawings are not scaled according to normal proportions, so they do not represent the actual relative sizes of the structures in the embodiments. The above or upper side of the structure or surface mentioned therein includes the situation where there are other layers in the middle.

[0028] Example 1

[0029] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, a portable passive direct methanol fuel cell system comprises a first assembly 1, a second assembly 2, a membrane electrode 3, a water-absorbing resin assembly 4 and a switch mechanism 5, wherein the first assembly has a mounting surface 11, on which a plurality of mesh holes 12 for improving the gas supply to the cathode end of the membrane electrode are arranged, the membrane electrode is mounted on the inner side of the mounting surface, and the cathode end of the membrane electrode faces the mesh holes; the water-absorbing resin assembly comprises a water-absorbing resin 41 and a storage box 42, the water-absorbing resin is positioned and accommodated in the storage box, the front side of the storage box is a porous structure 421, and the first assembly The ligand is assembled with the second assembly body to form an outer shell with an assembly space 6. The storage box body and the switch mechanism are installed in the assembly space. The switch mechanism can drive the storage box body to move toward the anode end of the membrane electrode, so that the water-absorbing resin in the storage box body can pass through the porous structure and stick to the anode end of the membrane electrode. The switch mechanism can also drive the storage box body away from the anode end of the membrane electrode, so that the water-absorbing resin in the storage box body is separated from the anode end of the membrane electrode. The water-absorbing resin is used to continuously provide methanol fuel that meets the power generation requirements of the membrane electrode.

[0030] The switch mechanism includes a slider 511, a driving member 512 and a return spring 513. The slider includes a slider body 5111 and a flange ring 5112 formed at the outer end of the slider body. A stepped slot 211 is formed on the rear side wall of the second assembly body facing the storage box body. The slider is slidably arranged in the stepped slot. The return spring is positioned between the flange ring of the slider and the step of the stepped slot. The storage box body is slidably arranged in the assembly space and is fixedly connected to the inner end of the slider body. The driving member is installed in the stepped slot and can drive the outer end of the slider body to move inward.

[0031] In the above structure, by directly attaching the membrane electrode to the inner side of the mounting surface of the first assembly, and forming a mesh on the mounting surface of the first assembly, the self-flow driven by the oxygen concentration gradient is used to realize the gas supply, thereby forming a passive open cathode structure, and no cathode plate is required, thereby simplifying the cathode end structure of the fuel cell; by arranging the water-absorbing resin in a storage box body, and driving the storage box body to move back and forth by the switch mechanism, the water-absorbing resin can pass through the porous structure of the storage box body and cling to the anode end of the membrane electrode installed on the first assembly. In this way, the water-absorbing resin can be used to continuously provide methanol fuel that meets the power generation requirements of the membrane electrode, forming a passive anode end, and no anode plate is required, thereby simplifying the anode end structure of the fuel cell; compared with the prior art, the cathode end and the anode end of the fuel cell of the present invention are both designed to be passive, which not only simplifies the structure of the fuel cell, greatly reduces the product volume, and is easy to carry, but also greatly reduces the cost of the fuel cell, and can be well used as a power bank.

[0032] In this embodiment, the switch mechanism is composed of a slider 511, a driving member 512 and a reset spring 513. The driving member is installed in the stepped groove hole on the side wall of the second assembly. Screws or bolts can be used. By tightening the screws or bolts, the slider can be driven to move inward. The front end of the slider is fixedly connected to the storage box body. Therefore, the slider can drive the storage box body to move inward, so that the water-absorbing resin in the storage box body passes through the porous structure of the storage box body and is close to the anode end of the membrane electrode installed on the first assembly body. At this time, the anode end of the membrane electrode of the fuel cell is continuously provided with methanol fuel that meets the power generation requirements of the membrane electrode by the water-absorbing resin, and the cathode end of the membrane electrode of the fuel cell uses the self-flow driven by the oxygen concentration gradient to realize gas supply. The fuel cell will continue to react and output electrical energy. The reset spring is positioned between the flange ring of the slider and the step of the stepped slot, and is used to reset the slider and the storage box body, so that the water-absorbing resin in the storage box body is separated from the anode end of the membrane electrode. When the locking bolt drives the slider to move inward, the reset spring is compressed to store energy. Therefore, when the fuel cell needs to disconnect the reaction and not supply power, the driving member is released, and the reset spring can drive the slider to move outward, so that the water-absorbing resin assembly installed on the slider is separated from the anode end of the membrane electrode. Therefore, the switch mechanism can drive the water-absorbing resin assembly to make the water-absorbing resin close to the anode end of the membrane electrode, and can drive the water-absorbing resin assembly to reset, so that the water-absorbing resin is separated from the anode end of the membrane electrode, thereby realizing the control of the reaction on and off of the membrane electrode of the fuel cell and the control of the power supply of the fuel cell.

[0033] In other embodiments, the switch mechanism can also use a button switch, such as a push-to-reset structure similar to a ballpoint pen. In this way, pressing the button switch can drive the slider to move inward and drive the storage box body to move inward, so that the water-absorbent resin in the storage box body can pass through the porous structure of the storage box body and stick to the anode end of the membrane electrode installed on the first assembly. Then pressing the button switch unlocks the slider, and the slider is reset to the initial position under the action of the reset spring, so that the water-absorbent resin is separated from the anode end of the membrane electrode.

[0034] Preferably, a fuel inlet 21 is formed on the outer shell, and the fuel inlet is connected to the water-absorbing resin through a fuel flow channel. A plug 22 is installed in the fuel inlet, so that after the methanol fuel stored in the water-absorbing resin is used up, fuel can be repeatedly added through the fuel inlet, which is equivalent to charging a power bank.

[0035] Example 2

[0036] like Figure 5 and Figure 6As shown, a portable passive direct methanol fuel cell system comprises a first assembly 1, a second assembly 2, a membrane electrode 3, a water-absorbing resin assembly 4 and a switch mechanism 5, wherein the first assembly has a mounting surface 11, on which a plurality of mesh holes 12 for improving the gas supply to the cathode end of the membrane electrode are arranged, the membrane electrode is mounted on the inner side of the mounting surface, and the cathode end of the membrane electrode faces the mesh holes; the water-absorbing resin assembly comprises a water-absorbing resin 41 and a storage box 42, the water-absorbing resin is positioned and accommodated in the storage box, the front side of the storage box is a porous structure 421, and the first assembly The ligand is assembled with the second assembly body to form an outer shell with an assembly space 6. The storage box body and the switch mechanism are installed in the assembly space. The switch mechanism can drive the storage box body to move toward the anode end of the membrane electrode, so that the water-absorbing resin in the storage box body can pass through the porous structure and stick to the anode end of the membrane electrode. The switch mechanism can also drive the storage box body away from the anode end of the membrane electrode, so that the water-absorbing resin in the storage box body is separated from the anode end of the membrane electrode. The water-absorbing resin is used to continuously provide methanol fuel that meets the power generation requirements of the membrane electrode.

[0037] The switch mechanism includes a slider 521, a driving member 522 and a return spring 523. A partition 524 is formed in the assembly space, and a through hole 5241 is formed on the partition. A guide sleeve 221 is formed on the side wall of the second assembly body facing the through hole. The slider includes a slider body 5211 and a flange ring 5212 formed on the outer end of the slider body. The slider is slidably arranged in the through hole, and the flange ring is located between the partition and the guide sleeve. The return spring is sleeved on the slider body and arranged between the flange ring and the partition. The storage box body is slidably arranged in the assembly space and fixedly connected to the inner end of the slider body. The driving member is installed in the guide sleeve and can drive the outer end of the slider body to move inward.

[0038] The working principle of the switch mechanism in this embodiment is similar to that in the first embodiment, except that the rear side wall of the second assembly in the first embodiment is thicker, while the rear side wall of the second assembly in this embodiment is thinner. At this time, a partition is provided in the assembly space, and a through hole is provided on the partition. The slider is slidably provided in the through hole. Correspondingly, a guide sleeve is provided on the rear side wall of the second assembly. The guide sleeve is used to install a driving member. For example, the driving member can be a screw or a bolt. By tightening the screw or the bolt, the slider can be driven to move inward. The front end of the slider is fixedly connected to the storage box body, which can drive the storage box body to move inward, so that the water-absorbing resin in the storage box body can pass through the porous structure of the storage box body and stick to the anode end of the membrane electrode installed on the first assembly. The reset spring is provided between the partition and the flange ring of the slider, which is used to reset the slider and the storage box body, so that the water-absorbing resin in the storage box body is separated from the anode end of the membrane electrode. Similarly, in this embodiment, the driving member can also be a button switch, such as a press reset structure similar to a ballpoint pen.

[0039] Preferably, a fuel inlet 21 is formed on the outer shell, and the fuel inlet is connected to the water-absorbing resin through a fuel flow channel. A plug 22 is installed in the fuel inlet, so that after the methanol fuel stored in the water-absorbing resin is used up, fuel can be repeatedly added through the fuel inlet, which is equivalent to charging a power bank.

[0040] Example 3

[0041] like Figure 7 , Figure 8 , Fig. 9 and Fig.10 As shown, a portable passive direct methanol fuel cell system comprises a first assembly 1, a second assembly 2, a membrane electrode 3, a water-absorbing resin assembly 4 and a switch mechanism 5, wherein the first assembly has a mounting surface 11, on which a plurality of mesh holes 12 for improving the gas supply to the cathode end of the membrane electrode are arranged, the membrane electrode is mounted on the inner side of the mounting surface, and the cathode end of the membrane electrode faces the mesh holes; the water-absorbing resin assembly comprises a water-absorbing resin 41 and a storage box 42, the water-absorbing resin is positioned and accommodated in the storage box, the front side of the storage box is a porous structure 421, and the first assembly The ligand is assembled with the second assembly body to form an outer shell with an assembly space 6. The storage box body and the switch mechanism are installed in the assembly space. The switch mechanism can drive the storage box body to move toward the anode end of the membrane electrode, so that the water-absorbing resin in the storage box body can pass through the porous structure and stick to the anode end of the membrane electrode. The switch mechanism can also drive the storage box body away from the anode end of the membrane electrode, so that the water-absorbing resin in the storage box body is separated from the anode end of the membrane electrode. The water-absorbing resin is used to continuously provide methanol fuel that meets the power generation requirements of the membrane electrode.

[0042] The switch mechanism includes a fixed rod 531, a toggle rod 532, a sliding rod 533 and a connecting piece 534. The top end of the fixed rod is installed on the top wall of the assembly space and is parallel to the storage box body. The sliding rod is arranged perpendicular to the storage box body. One end of the sliding rod is fixed to a position of the fixed rod near the top, and the other end of the sliding rod is slidably penetrated into a through hole on the toggle rod near the top; one end of the connecting piece is rotatably connected to the storage box body through a first pin shaft 535, and the other end of the connecting piece is pivotally connected to the bottom end of the fixed rod through a second pin shaft 536. A waist-shaped slide groove 5341 is formed in the middle part of the connecting piece, and a third pin shaft 537 is penetrated in the waist-shaped slide groove. The bottom end of the toggle rod is fixedly connected to the third pin shaft, and the top end of the toggle rod passes through the top wall of the assembly space.

[0043] In this embodiment, the switch mechanism is composed of a fixed rod 531, a toggle rod 532, a sliding rod 533 and a connecting piece 534. The fixed rod plays a role in positioning the connecting piece. The middle part of the connecting piece is pivotally connected to the bottom end of the fixed rod through a second pin shaft. The connecting piece, such as a connecting plate or a connecting sheet, can rotate freely around the second pin shaft. The top end of the toggle rod passes through the top wall of the assembly space (for example, it can be the top wall of the first assembly body or the top wall of the second assembly body), which is convenient for the operator to drive and control. The toggle rod is assembled into the waist-shaped slide groove of the connecting piece through the third pin shaft. The toggle rod is passed through The hole and the slide rod are slidably matched, so that the driving lever slides forward and backward along the slide rod, and the bottom end of the slide rod can drive the third pin shaft to slide in the waist-shaped slide groove of the connecting piece, thereby driving the connecting piece to rotate around the second pin shaft by an angle, changing the length of the connecting piece in the horizontal direction, and then applying a driving force to the storage box body in the horizontal direction to make the water-absorbing resin close to the anode end of the membrane electrode, and applying a pulling force to the storage box body to drive the water-absorbing resin assembly to reset, so that the water-absorbing resin is separated from the anode end of the membrane electrode, thereby realizing the on-off control of the reaction of the membrane electrode of the fuel cell.

[0044] Preferably, the switch mechanism further comprises a positioning assembly 538 for positioning the toggle rod, the positioning assembly comprises a positioning pin 5381 and a compression spring 5382, a positioning hole is provided at the bottom of the slide rod, the compression spring and the positioning pin are installed in the positioning hole, and the compression spring drives the ball head of the positioning pin to pass through the positioning hole. In this way, when the toggle rod drives the connecting piece to make the water-absorbing resin close to the anode end of the membrane electrode, the positioning assembly can position the toggle rod to prevent the toggle rod from retreating and affecting the contact effect.

[0045] Preferably, a methanol barrel 8 is provided in the assembly space, the water-absorbing resin is connected to the methanol barrel through a pipeline, a feeding port 23 is formed on the outer shell, the feeding port is connected to the methanol barrel through a fuel flow channel, and a sealing plug is installed in the feeding port. In this way, the water-absorbing resin can continuously obtain methanol fuel from the methanol barrel, thereby increasing the service life of the portable passive direct methanol fuel cell system and improving the problem of frequent addition of methanol fuel.

[0046] In the above-mentioned embodiments 1, 2, and 3 of the present invention, the membrane electrode is directly mounted on the inner side of the mounting surface of the first assembly, and a mesh structure is formed on the mounting surface of the first assembly. Here, the first assembly adopts a shell form, and similarly, the second assembly also adopts a shell form. The two shells are assembled together through a snap-fit ​​structure to form a closed assembly space to accommodate the membrane electrode, the water-absorbing resin component, the switch mechanism, etc. However, it is not limited to this. In other embodiments, the first assembly and the second assembly can also be plates with a certain thickness. For example, when the first assembly is designed as a flat plate structure, a cathode window can be formed on the flat plate, and the membrane electrode is installed on the inner side of the cathode window of the flat plate, and the cathode end of the membrane electrode is facing the cathode window. A cathode protection mesh cover is installed on the outer side of the cathode window, and a plurality of meshes for improving the gas supply to the cathode end of the membrane electrode are arranged on the cathode protection mesh cover, so that the gas supply is realized by self-flow driven by the oxygen concentration gradient. Since the flat plate has thickness, a porous cathode protection layer can be provided between the cathode protection mesh cover and the cathode end of the membrane electrode. The cathode protection layer is made of one of porous carbon fiber, ceramic and metal, and the pore size of the cathode protection layer is 0.1-20 nm.

[0047] Preferably, the cathode window is square, and each side of the cathode window has a width of 1 to 5 mm. As a preferred embodiment, the cathode window is designed to be square, such as square or rectangular, but not limited thereto, and in other embodiments, it can also be a regular or irregular shape such as a circle or an ellipse.

[0048] Optionally, the water-absorbing resin is one of acrylic acid, acrylamide, polyvinyl alcohol, polyethylene oxide, starch grafted acrylate polymer cross-linked product and acrylamide-acrylate copolymer cross-linked product. Preferably, the water absorption rate of the water-absorbing resin is 30-70%.

[0049] Preferably, the outer shell is formed with an electrical output interface 7 for charging electronic products and a current and voltage control unit for controlling the electrical output of the membrane electrode. The current and voltage control unit can rectify the current output by the membrane electrode or stabilize the voltage output by the membrane electrode, and the electrical output interface can realize the electrical output of the membrane electrode to charge the electronic product, such as a USB interface, a Type-C interface, a Lightning interface, etc.

[0050] The above embodiments are to describe the preferred embodiments of the present invention in detail with reference to the accompanying drawings. Those skilled in the art may make various modifications or changes to the above embodiments without departing from the essence of the present invention, which shall fall within the protection scope of the present invention.

Claims

1. A portable passive direct methanol fuel cell system, characterized in that: The invention comprises a first assembly (1), a second assembly (2), a membrane electrode (3), a water-absorbing resin component (4) and a switch mechanism (5), wherein the first assembly has a mounting surface (11), on which a plurality of mesh holes (12) for improving the gas supply to the cathode end of the membrane electrode are arranged, and the membrane electrode is mounted on the inner side of the mounting surface with the cathode end of the membrane electrode facing the mesh holes; the water-absorbing resin component comprises a water-absorbing resin (41) and a storage box (42), the water-absorbing resin is positioned and accommodated in the storage box, and the front side of the storage box is a porous structure (421); The storage box body is assembled with the second assembly body to form an outer shell having an assembly space (6), the storage box body and the switch mechanism are installed in the assembly space, the switch mechanism can drive the storage box body to move toward the anode end of the membrane electrode, so that the water-absorbing resin in the storage box body passes through the porous structure and adheres to the anode end of the membrane electrode, and the switch mechanism can drive the storage box body away from the anode end of the membrane electrode, so that the water-absorbing resin in the storage box body is separated from the anode end of the membrane electrode, and the water-absorbing resin is used to continuously provide methanol fuel that meets the power generation requirements of the membrane electrode.

2. The portable passive direct methanol fuel cell system according to claim 1, characterized in that: The switch mechanism (5) comprises a slider (511), a driving member (512) and a return spring (513); the slider comprises a slider body (5111) and a flange ring (5112) formed at the outer end of the slider body; a stepped slot (211) is formed on the rear side wall of the second assembly body facing the storage box body; the slider is slidably arranged in the stepped slot; the return spring is positioned between the flange ring of the slider and the step of the stepped slot; the storage box body is slidably arranged in the assembly space and is fixedly connected to the inner end of the slider body; the driving member is installed in the stepped slot and can drive the outer end of the slider body to move inward.

3. The portable passive direct methanol fuel cell system according to claim 1, characterized in that: The switch mechanism (5) comprises a slider (521), a driving member (522) and a return spring (523); a partition (524) is formed in the assembly space, a through hole (5241) is formed on the partition, a guide sleeve (221) is formed on the side wall of the second assembly body facing the through hole, the slider comprises a slider body (5211) and a flange ring (5212) formed on the outer end of the slider body, the slider is slidably arranged in the through hole, and the flange ring is located between the partition and the guide sleeve, the return spring is sleeved on the slider body and arranged between the flange ring and the partition, the storage box body is slidably arranged in the assembly space and is fixedly connected to the inner end of the slider body, the driving member is installed in the guide sleeve and can drive the outer end of the slider body to move inward.

4. The portable passive direct methanol fuel cell system according to claim 1, characterized in that: The switch mechanism (5) comprises a fixed rod (531), a toggle rod (532), a sliding rod (533) and a connecting piece (534); the top end of the fixed rod is mounted on the top wall of the assembly space and is parallel to the storage box body; the sliding rod is arranged perpendicular to the storage box body; one end of the sliding rod is fixedly connected to a position of the fixed rod near the top end; the other end of the sliding rod is slidably inserted into a through hole on the toggle rod near the top end; one end of the connecting piece is rotatably connected to the storage box body via a first pin shaft (535); the other end of the connecting piece is pivotally connected to the bottom end of the fixed rod via a second pin shaft (536); a waist-shaped sliding groove (5341) is formed in the middle of the connecting piece; a third pin shaft (537) is inserted into the waist-shaped sliding groove; the bottom end of the toggle rod is fixedly connected to the third pin shaft; the top end of the toggle rod passes through the top wall of the assembly space.

5. The portable passive direct methanol fuel cell system according to claim 1, characterized in that: The outer shell is provided with an electrical output interface (7) for charging electronic products and a current and voltage control unit for controlling the electrical output of the membrane electrode.

6. The portable passive direct methanol fuel cell system according to claim 1, characterized in that: A fuel inlet (21) is formed on the outer shell, the fuel inlet is connected to the water-absorbing resin via a fuel flow channel, and a plug (22) is installed in the fuel inlet.

7. The portable passive direct methanol fuel cell system according to claim 1, characterized in that: A methanol barrel (8) is provided in the assembly space, the water-absorbing resin is connected to the methanol barrel via a pipeline, a feed port (23) is formed on the outer shell, the feed port is connected to the methanol barrel via a fuel flow channel, and a sealing plug is installed in the feed port.

8. The portable passive direct methanol fuel cell system according to claim 1, characterized in that: The water-absorbing resin is one of acrylic acid, acrylamide, polyvinyl alcohol, polyoxyethylene, starch grafted acrylate polymer cross-linked product and acrylamide-acrylate copolymer cross-linked product.

9. The portable passive direct methanol fuel cell system according to claim 1, characterized in that: The water absorption rate of the water-absorbing resin is 30-70%.

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