TWM383209U - Flat fuel cell assembly - Google Patents

Abstract

A flat fuel cell assembly including a membrane electrode assembly (MEA), a cathode porous current collector, an anode porous current collector, a gas barrier material layer, a case, and at least one air baffle is provided. The cathode porous current collector and the anode porous current collector are disposed at two opposite sides of the MEA. The gas barrier material layer is disposed at a side of the cathode porous current collector and has at least one opening for exposing a surface of the cathode porous current collector. The case is disposed at a side of the MEA, the gas barrier material layer is disposed between the case and the MEA, and an air channel is located between the gas barrier material layer and the case. Additionally, the air baffle disposed within the air channel.

Description

A. New description: [New technical field] This creation is about a fuel cell structure, and it is related to a flat fuel cell assembly. [Prior Art] P is close to the progress of JL industry. Traditional energy sources such as coal, oil and natural gas have continued to increase. Due to the limited stock of natural energy, it is necessary to develop alternative energy sources to replace traditional H and fuel cells. It is an important and practical choice. Simply put, a fuel cell is basically a money-making device that converts chemical energy into energy using the inverse reaction of water electrolysis. In the case of a proton exchange membrane fuel t-cell, it is mainly composed of a membrane dectrode assembly (MEA) and a two-electrode plate. The thin film electrode set is a proton exchange membrance, an anode catalyst layer, a cathode catalyst layer, an anode gas diffusion layer (§1 〇111 矽, GDL), and a cathode gas diffusion layer. Composition. The anode catalyst layer and the cathode catalyst layer are disposed on both sides of the proton conducting membrane, and the anode gas diffusion layer and the cathode gas diffusion layer are respectively disposed on the anode catalyst layer and the cathode catalyst layer. Further, an electrode plate includes an anode and a cathode which are disposed on the anode gas diffusion layer and the cathode gas diffusion layer, respectively. The proton exchange membrane fuel cell commonly used in the industry is a Direct Methanol Fuel Cell (DMFC), which is a direct anode: ch3oh+h2o 4 c〇2+6H++6e-cathode: 3/202+6H+ +6e 4 3h2〇, the anode will consume 1 mole of water, the cathode will produce 3 moles of water, and the water produced by the reaction should be removed immediately, and on the surface of the layer, so The fuel cell is continuously reacted to generate an electric current. Regarding water management in fuel cells, various treatment methods have been proposed in the industry. For example, the US Patent Application No. 2G_G79398A1 is entitled "FUEL CELL", and its content reveals that it can additionally make devices such as pumps, heat sinks, and fans. The water produced by the fuel cell is removed. However, such a tilt increases the cost and causes the entire component to be too bulky to be miniaturized. In addition, U.S. Patent Application Publication No. 2004/0209154A1 (US Pub. No. 2004/0209154A1) is entitled, pASSIVE water MANAGEMENT TECHNIQUES IN DIRECT METHANOL FULE CELLS, the disclosure of which is disclosed in the outside of the cathode with micropores The hydrophobic material layer causes the cathode water to generate a back pressure therebetween, and then the pressure difference between the two sides of the proton conducting membrane can be used to permeate the water to the anode so that it can be recycled inside the fuel cell. However, this method is liable to cause water to clog in the micropores or to be unrecoverable. Therefore, the method is difficult to manufacture, and even the air thermal method can be smoothly entered, thereby affecting the output power of the fuel cell. Another type of water management in a fuel cell is a fuel cell described in Japanese Patent Publication No. M383209 9974: ^. The content of this patent is j = '.·, the cathode side of the battery is provided with an air chamber shirt chambe small and ^ m, M. m M (humidity-holding sheet) 〇 ^ ^ = Zen Γ is to suppress the cathode side The water produces evapotranspiration:: == The amount of water stored in the media layer increases. By the permeation phenomenon, water that can be formed in the cathode catalyst layer moves to the anode catalyst layer. In addition, Japan supplements W0 2005/U2172A1, which supplies fuel gasification components to the fuel cell of the method of Touch County. The anode structure of the fuel cell needs to include a fuel storage tank, an emulsion phase, and a gasification combustion capacity. "In order to make the liquid material oxygenable," and on the cathode side - there is a suitable moisture permeable wire, but the moisture layer is - with a uniform pore size, the material is easily condensed by moisture Blocking the pores on the moisturizing layer makes the gas inaccessible, affecting the output power of the fuel cell. = Top: Knowing that water management is an important key technology for fuel cells, it has become one of the most important topics in the industry. This creation provides a kind of flat-type fuel electric energy with good performance. It also provides a kind of flat fuel cell stack, which includes j membrane electrode assembly (MEA), ~, 5) The electric layer, the anode porous collector layer, the gas barrier material layer, the outer shell, and the 匕-air flow. The cathode porous collector layer and the anode porous collector are disposed on both sides of the membrane electrode group. The M383209 99. 4. 2mjf 1 ^W£i side of the cathode pen 2, the ^ hole collector layer has at least one opening to expose a surface of the cathode porous collector layer, and the shell is disposed in the Lai electrode group. The side, the gas barrier material layer is disposed between the outer and the 4 membrane electrode groups' and the gas flow channel is located between the gas barrier material layer and the outer gas layer, and at least one gas flow baffle is disposed in the gas flow channel In one embodiment, the thin film electrode assembly includes a proton conducting, a membrane positive sensing layer, a cathode catalytic layer, an anode gas diffusion layer, and a cathode gas diffusion layer, wherein the anode catalyst layer and The cathode catalyst layer is disposed on both sides of the proton conducting membrane, and the anode gas diffusion layer and the cathode gas diffusion layer are disposed on the anode catalyst layer and the cathode catalyst layer, respectively. In one embodiment of the present invention, the diameter of the opening is DI, and the thickness of the gas barrier material layer is T, and DI > 2T. In one embodiment of the present invention, the planar fuel cell stack further includes a layer of water absorbing material disposed on the outer casing, wherein the layer of water absorbing material is between the outer casing and the gas barrier material layer. In one embodiment of the present invention, the planar fuel cell stack further includes a fan for generating a gas stream, wherein the air flows from a gas inlet of the gas flow passage to a gas outlet of the gas flow passage. - In one embodiment of the present invention, the outer casing is an airtight casing. In one embodiment of the present invention, the airflow baffle is disposed on the gas barrier material layer and extends toward the outer casing. In one embodiment of the present invention, the airflow baffle is disposed on the outer casing and extends toward the layer of gas barrier material. In one embodiment of the present invention, the gas barrier material layer has an open cell ratio of between 0.5% and 21%. 7 M383209 师 4:2 I月曰t In one embodiment of the present invention, the material of the gas barrier material layer comprises a poly-polymer or a polyolefin polymer, wherein the polyester polymer is, for example, poly-p-dicarboxylic acid A glycol ester (pET) or a polyacrylonitrile (pAN), and the polyolefin polymer is, for example, polyethylene (PE) or polypropylene (pp), or other gas barrier material suitable for the open cell process. In one embodiment of the present invention, the thickness of the gas barrier material layer is between 1 〇 μηη and 5 mm. In one embodiment of the present invention, there is a gap between the gas barrier material layer and the cathode porous collector layer, and the gap is less than 1.5 cm. In one embodiment of the present invention, the gas barrier material layer and the cathode porous collector ☆ In one embodiment of the present invention, the planar fuel cell stack further comprises a hydrophobic porous material (4) placed on the cathode (10) electrical layer And between the layers of gas barrier material. The material of the hydrophobic porous material layer is, for example, polytetrazole (PTFE), polydiphenyl (pp), or poly-wind, or other related materials having a hydrophobic material applied to the surface and the opening. In an embodiment, the layer of hydrophobic porous material is entirely overlying the cathode porous collector layer. In other embodiments, the layer of hydrophobic porous material is on the cathode porous layer and is exposed by the openings of the gas barrier material layer. In the present invention, the material of the proton conducting iridium is, for example, a polymer film. In the present invention, the material of the anode catalyst layer is, for example, an alloy of turning/turning, a carbonaceous particle surface coated with a bismuth alloy (IV) carbonaceous particles 0, 8 M383209

In one embodiment of the present invention, the material of the cathode catalyst layer is, for example, an alloy, a platinum alloy-plated carbonaceous particle or a platinum-plated carbonaceous particle. It is to be understood that the above general description and the following detailed description are exemplary of the invention and may be further & [Embodiment] Fig. 1A is a schematic diagram showing the junction of a planar fuel cell stack according to an embodiment of the invention. Referring to FIG. 1A, a planar fuel cell stack 1 includes a thin film corona electrode set (MEA) 102, a cathode porous collector layer 1〇4, an anode porous electric layer 106', and a gas barrier material layer 1〇8'. An outer casing 13A and at least one airflow baffle 140. As shown in FIG. 1A, the outer casing 130 is disposed on one side of the thin film electrode group 1〇2, the gas barrier material layer 108 is disposed between the outer casing 13〇 and the thin film electrode group 102, and the gas flow path A is located in the gas barrier material layer 1 Between the 〇8 and the outer casing 130. Further, the air flow baffle 14 is disposed in the gas flow path A. The distance between the outer casing 130 and the gas barrier material layer 108 is, for example, between 〇3 mm and 3 mm. In the present embodiment, the thin film electrode assembly 1〇2 includes a proton conducting membrane U0, an anode catalyst layer 111, a cathode catalyst layer 113, an anode gas diffusion layer (GDL) 112, and a cathode gas diffusion layer 114. The anode catalyst layer 111 and the cathode catalyst layer 113 are respectively disposed on both sides of the conductive film 11A, and the anode gas diffusion layer and the cathode body diffusion layer 114 are respectively disposed on the anode catalyst layer and the cathode catalyst. On layer 113. The material of the anode catalyst layer 11 i is, for example, a drill/shu alloy (test (1), outer = / 钌 = transcription correction, and the material of the cathode catalyst layer 113 is, for example, the first alloy: The rhodium-plated carbon material is cis or other suitable reading material. Protons are used as the electrolyte membrane for transporting β. The material of the proton conductive membrane 110 is, for example, a polymer membrane, which is, for example, a Naflon membrane produced by the company DuP〇nt. The anode porous collector layer 106 is disposed on the anode gas diffusion layer 112 side of the thin film electrode group 1 2 . The material of the anode porous collector layer ι 6 is, for example, a conductive material, which is, for example, titanium (邛 and its alloy. The cathode porous collector layer 1G4 is disposed on the cathode gas diffusion layer ιι4 side of the thin film electrode group 1G2. In the present invention, the material of the cathode porous collector layer is, for example, a conductive material, for example, Titanium and its alloys. The planar fuel cell stack 100 of the present embodiment further includes a gas barrier material layer 108' disposed on the cathode porous collector layer 104, and the gas barrier material layer 108 is opposite to the cathode porous collector layer 104. Contact. Material pack of gas barrier material layer 108 Including a poly-molecular molecule or a polymer, wherein the polyester polymer is, for example, p〇lyethylene terephthalate 'PET or polyacrylonitrile (PAN), The olefin polymer is, for example, polyethylene (pQly e% lene, PE), polypropylene (polypropylene 'PP) or other gas barrier material which can be used for opening processing. The gas barrier material has a thickness of, for example, i 〇μπι Between the five sides, in the present embodiment, the thickness of the gas barrier material layer 1 〇 8 is, for example, about μπι. The 108% function of the gas barrier material layer is controlled by the cathode catalyst layer 113 after the reaction. The rate of water bursting allows the water in the cathode catalyst layer η3 to pass through the proton

The V film lio diffuses to the anode catalyst layer in, and the water of the cathode catalyst layer I] is supplied to the anode catalyst layer U1 for use in the reaction. The gas barrier material layer 108 has at least one opening exposing the surface of the cathode porous collector layer 1-4, and in the embodiment, a plurality of openings 116 are illustrated as an example. Further, in the embodiment of the present invention, the shape of the hole U6 is not particularly limited. Since the planar fuel cell stack of the present invention reacts in the cathode catalyst layer 113 to generate water, the size of the opening 116 of the gas barrier layer must be prevented from being flooded and empirically avoided. The water causes the opening 116 to become clogged, and the shortest aperture of the opening 116 must be greater than twice the thickness of the gas barrier material layer 108. That is, if the opening 116 is a circular opening, the diameter D] [is required to be greater than twice the thickness of the gas barrier material layer Ι0δ. In this embodiment, the diameter DI of the opening 116 is greater than about 200 μm; if the opening 16 is a rectangular opening, the length of the short side must be greater than twice the thickness of the gas barrier layer 1〇8. In an embodiment, the length of the short side of the opening 116 is greater than about 2 μm η. The overall opening ratio of the gas barrier material layer 108 is between 0.5% and 21%, in one embodiment of the present invention. The opening ratio of the gas barrier material layer 1〇8 is, for example, about 5%. Hereinafter, the formula calculation will be used to explain in detail the appropriateness of the opening ratio of the gas barrier material layer of the present invention. In general, when the fuel electrode group generates 1 ampere (Α) current, the cathode catalyst layer requires 3.5 ml/min (ml/min) of oxygen (〇2) to participate in the reaction, that is, approximately 17.4 ml/mm is required. The amount of air, in practical applications, must at least increase the amount of this gas by about 1.1 to 4 times to ensure that sufficient oxygen enters the cathode catalyst layer. The gas permeability of the gas barrier material layer can be estimated by the following diffusion formula (1).

-nru· (1),

Ay where z is the amount of current produced per unit area, single a 2 is the number of moles (_e), and the reverse position of the cathode catalyst layer is (A/Cm wide « 4 m of electrons, so the ceremony is 4 Every material = ear ^^ * ^ 96500 c〇ul/mole ; ί (

The coefficient is about 〇.2~o domain; the second is the difference between the two oxygens „= 3, the sentence, the difference between the Chen, the early position is 8.6Χ1 (^ι in the atmosphere at room temperature * 1 cubic centimeter is about. The length of the diffusion path is in centimeters. The thickness of the gas barrier material layer is 2 cm, and the gas barrier material layer is 1%. For =, the current value calculated by equation (1) is 66. 〇 mA / cm, this value must be divided by u ~ 4, and it has (4) the amount of power required to supply many conditions.

The outer casing 130 is, for example, an airtight casing. It is worth noting that the external λ 130 can be an outer casing of an electronic device or an inner housing assembled in a casing. Further, a gas inlet A1 and a gas outlet A2 of the gas flow path A are defined by the outer casing 130. As shown in Fig. 1A, in addition to the gas inlet A1 and the gas outlet A2, the present embodiment does not need to be designed on the outer casing 13 to allow water to evaporate as a target hole. In the present embodiment, the planar fuel cell stack 1 further includes a fan 150 to generate a gas flow (as indicated by a broken line), wherein the gas system flows from the gas inlet A1 of the gas flow channel A to the gas flow channel A. Gas 12 M383209 99Γ4Γ Year

The outlet A2 bears the above, and even if the outer casing 130 is blocked by the object, the fan 150 can supply sufficient oxygen in the gas flow path a to prevent the operation of the flat type fuel cell stack 100 from being affected. It is worth noting that the gas flow generated by the control fan 150 can be used to activate the cathode catalyst layer ι13, the so-called Air Starvation.

In the present embodiment, the 'planar fuel cell stack 1' may further include a water absorbing material layer 160 disposed on the inner surface of the outer casing 130. In other words, the water absorbing material layer 160 is located between the outer casing 130 and the gas barrier material layer 108 to help prevent moisture accumulation. In one embodiment, the water absorbing material layer 160 is a hydrophilic material layer having a thickness of about 1 〇〇 micrometer, and the water absorbing material layer 160 is, for example, entirely covering the inner surface of the outer casing 130 or partially covering the outer casing 130. surface. Further, the water absorbing material layer 160 may include a plurality of fine stripe patterns (not shown).

As shown in Fig. 1A, a plurality of air baffles 14A and air baffles 140 are shown disposed on the gas barrier material layer 108 and extend toward the outer casing 13A. The distribution pattern of the airflow baffle 14 disposed on the gas barrier material layer 108 and the number of visual design requirements are appropriately changed. In a preferred embodiment, the airflow baffle 140 is disposed adjacent to the gas outlet A2 to more efficiently conduct air into the cathode porous collector layer 1〇4. Fig. 1B is a schematic view showing the structure of a planar fuel cell stack according to another embodiment of the present invention. Referring to FIG. 1B, the planar fuel cell stack 1A of the present embodiment is similar to the planar fuel cell stack 1A of the above embodiment, but the main difference is that the airflow baffle 140 is disposed on the outer casing 130. Up and extending toward the gas barrier material layer 108. It can be seen from FIG. 1A and FIG. 1B that in a real M383209 曰 丨 py. 4. 2 ー embodiment, part of the airflow baffle 140 is disposed on the casing i3 , and extends toward the gas barrier material layer 1 〇 8 The other air baffles 14 are disposed on the gas material layer 108 and extend toward the outer casing 13A. Please refer to FIG. 2, which is a schematic structural view of a planar fuel cell stack according to another embodiment. As shown in FIG. 2, the planar type of fire material of the present embodiment is the same as that of the above-described embodiment of the planar fuel cell stack t, but the main difference is that the planar fuel cell stack 100 The gas barrier material layer 108 is disposed on the cathode porous collector layer 1〇4, and the gas barrier material layer 108' has a plurality of openings 116 therein to expose the surface of the cathode porous collector layer. Further, a gap d exists between the gas barrier material layer 1〇8 and the cathode porous collector layer 1〇4. And the gap d is, for example, less than 15 cm. The planar fuel cell stack of the present invention only needs to be on the cathode porous collector layer = the gas barrier material layer having the opening, and the opening ratio of the gas barrier material layer is within the proper range of the factory, so the cathode catalyst layer can be reduced. The evaporation of water, the difference in the concentration gradient between the polar catalyst layer and the anode catalyst layer, causes the water to diffuse toward the anode catalyst layer, so that the water of the cathode catalyst layer is shouted to the yang county for reuse, and the purpose is simple, and The entire fuel cell has less than 2 + parts, so it can be saved: t, this creation does not need to change the current fuel cell ten-line cathodic contact ^ and :: ^ can be entered in this simple and effective way The created flat fuel cell stack can recover the water from the agricultural catalyst layer to the % polar catalyst layer and then use the ancient concentration of fuel to carry out the anti-banking. For example, the μ port can be used to improve the fuel. Energy Conversion 14 M383209 • Year Month Solution 8 • L Supplement ί Efficiency ο Next, the water recovery method of the cathode catalyst layer of the planar fuel cell stack will be described in detail by taking the planar fuel cell stack 1 of FIG. 1 as an example. . With continued reference to Fig. 1A, the fuel is introduced into the anode porous collector layer 1〇6. In this embodiment, a solution of methanol (Me〇H>]c is used as a fuel. Of course, the planar fuel cell stack of the present invention The fuel is also, for example, a B. alcohol, a propanol or other suitable fuel. In addition, the air is passed through the gas barrier material layer 1〇8 • #孔孔116 into the 'passing through the cathode porous collector layer 1〇4 and the cathode gas diffusion layerΠ4 And passing to the cathode catalyst layer 113. The action of the anode catalyst layer ui allows the aqueous methanol solution to react to generate protons (H+), electrons (e_) and carbon dioxide (c〇2). The protons generated above are transmitted via protons. The film 11 is on the side of the cathode catalyst layer 113, and the electrons reach the side of the cathode catalyst layer via the external circuit, and the water (H2〇) can be formed with the oxygen supplied from the air via the action of the cathode catalyst layer 113. When the cathode catalyst After the layer 113 reacts to form water, the gas barrier layer 108 can control the rate of evaporation of water accumulated on the side of the cathode catalyst layer 113, and the concentration difference of water on the left and right sides of the proton conductive membrane 110 is formed: the cathode catalyst is made. The water on the layer side diffuses to the side of the anode degassing layer ηι , to reach the return water target. ' ' ^ In more detail, please refer to Figure 3, which shows the evaporation mechanism of water generated on the cathode catalyst layer side of the planar fuel cell stack of the present invention. The gas barrier material layer is not shown, and the other components of the planar fuel cell stack are omitted. As shown in Fig. 3, the water vapor generated at different positions may have different evaporation paths. The cathode catalyst layer reaction is generated. A portion of the water vapor ',,, will pass through the opening 124 of the gas barrier material layer 122 along the evaporation path 118, 120. The other portion of the water is shown as the evaporation path 128. The gas barrier material layer 122 is fed. It can be seen that the gas barrier material layer of the fuel cell stack of the present invention can be used to lower the overall water vapor, and the t-rate to increase the humidity and thereby achieve the purpose of returning water. According to the evaporation path 118, 120, 128, the surrounding area 126 of the opening 124 of the material layer 122 is a relatively dry = area. That is, the surrounding area 126 of the opening 124 The humidity of the gas barrier material layer 122 is lower than that of the gas barrier material layer 122. Therefore, in order to better mention The ruler effect may be arranged in the planar fuel cell stack of the present invention. The layer of the layer material may be disposed in detail. Hereinafter, a plurality of embodiments will be described in detail, and reference is made to FIG. 4, which is in accordance with the present invention. A schematic structural view of a planar fuel cell stack according to another embodiment of the present invention. As shown in FIG. 4, the planar fuel cell stack 2 of the present embodiment and the planar fuel cell stack 1 of FIG. The main difference is that the planar fuel cell stack 2 also includes a hydrophobic porous material layer 202. The hydrophobic porous material layer 2〇2 is disposed on the cathode porous collector layer 1〇4 and the gas barrier material layer. Between 1 and 8, and fully covered on the cathode porous collector layer 1〇4. The hydrophobic porous material layer 2〇2 of the material such as 疋t tetrafluoroethylene (p〇lytetra£|u〇r〇ethyiene, ptfe), polypropylene (polypropylene 'PP), poly (harder) (p〇iyestersu than 〇ne , pEs) or related materials with surfaces and holes covered with hydrophobic treatment. The thickness of the hydrophobic porous material layer 202 is, for example, about 5 μm to 2 mm. Since the hydrophobic porous material layer 202 has a function of retaining water vapor, the evaporation rate of the gas barrier material layer 108 directly under the opening 1 丨 6 and the surrounding area can be lowered. In other words, the area around the opening 116 of the gas barrier material layer 108 is not 16

There is a relatively dry area, and there is a polar and uniform humidity on the gas barrier material layer 108, so that the water return effect is better and more stable. Referring to FIG. 5, it is a schematic structural view of a planar fuel cell stack according to another embodiment of the present invention. As shown in FIG. 5, the planar fuel cell stack 200 of the present embodiment is similar to the planar fuel cell stack of FIG. 1A, but the main difference between the two is that the planar fuel cell stack 200 includes a hydrophobic porous material. Layer 202,. The hydrophobic porous material layer 2〇2, • is disposed between the cathode porous collector layer 1〇4 and the gas barrier material layer 1〇8, and is located at the cathode porous collection exposed by the opening 116 of the gas barrier material layer 104. On layer 108. The material of the hydrophobic porous material layer 202' is, for example, polytetrafluoro(10)ethylene (pTFE), polypropylene (p〇lypr (4) (10), PP), polyethersulfone (PES) or surface and pore coated with hydrophobic The relevant material to be processed. The thickness of the hydrophobic porous material layer 202 is, for example, about 50 μηι 〜2 faces. The hydrophobic porous material layer 2〇2 not only reduces the evaporation rate immediately below the opening 116 of the gas barrier material layer 1 and the surrounding area, but also improves the water returning effect. Moreover, the hydrophobic porous material layer 2〇2, and the lateral diffusion of water* under the gas barrier material layer 1〇8, also contributes to the presence of extremely high and uniform humidity on the gas barrier material layer 108. . In addition, the actual test data of this creation can be as shown in Table 1. Table 1 includes the test results of Comparative Examples 1 to 2 and Experimental Examples i to 7, wherein Comparative Examples 1 to 2 are tests in which a planar fuel cell stack is not provided with a gas barrier material layer, and Experimental Example 2 3 to 4 and 5 to 6 are tests in which a gas barrier material layer having a thickness of (10) μΓη 'μπι, _ is disposed in a planar solder. Experimental example 7 is a flat fuel cell stack configuration thickness 17 M383209 year, month, no arrow

A 100 μιη gas barrier material layer and a 5 μ μm hydrophobic porous layer were tested.曰η Zhiyi steep gas material layer thickness (μπι) gas barrier material layer open cell ratio fuel concentration (vol.%) actual anode water consumption / theoretical anode water consumption comparison example 1 no 100% 3 2.13 --- comparative example 2 _ none 100% 10 12.41 - Experimental Example 1 _ 100 3% 10 - 0.25 Experimental Example 2 _ 100 4% 8.5 - 0.02 - Experimental Example 3 200, - 21% 10 - 2.56 - Experimental Example 4, 200 11% 10 - 2.97 --S Experimental Example 5 _ 400 21% 10 -2.74 Experimental Example 6 400 ~~- 11% 10 -3.14 Experimental Example 7 ΙΟΟμιη Gas barrier material layer +500μιη Hydrophobic porous material, layer 5% 10 -6.28 - JA case The test results of 1 to 2 show that there is no configuration of gas barrier material layer =, 'face type fuel cell group has no way to achieve the effect of cathode backwater. From the test results of Example 1, the thickness of the gas barrier material layer is 100 μm, the opening ratio is 3%, and the actual anode water consumption/theoretical anode water consumption is 〇·25, which means that the water is returned from the cathode. The amount of water is greater than the amount of water consumed by the anode, that is, the effect of the cathode backwater can be achieved. It can be seen that the flat type of this creation is 18 V·/»

.__Supplement I The fuel cell stack does recover the water reuse of the polar catalyst layer. The sound of the ==Γ3'4 and the experimental examples 5 and 6 show that the effect of the gas barrier material ===== is better. The layer of gas barrier material, the cathode back water effect::: fruit can be known, in the resistance of the material, the second test case 1, 2 and the experimental example 7, can know the good i pole back The upper layer of the hydrophobic porous material can be obtained. It can be seen that the thickness of the gas barrier material layer, the opening ratio and the burning degree all affect the thickness of the cathode dry π layer, and the opening ratio is improved. H, the gas barrier material is Υι, 丨M k 八坤 1 hole sheep is smaller, both will make the water evaporation less, the second is good for r 2, T degree is more south' and the anode side fuel concentration is higher, The heart is then conducive to the formation of water from the cathode to expand the proper matching of the / length gradient. Therefore, if it is possible to clean the secret type of the fuel cell, the planar fuel cell stack can be used for the purpose of using the water layer of the dielectric layer to the anode catalyst layer. Figure. The structure of the fuel cell stack is shown in Fig. 4. The flat fuel cell stack 200 in Fig. 4 is similar to the fuel cell stack in the above, but the main difference is that the battery pack is fine. A gas fuel cell stack 200 using gas-dizzing + heart-only embodiment, including a cathode porous collector layer (10), an anode porous layer: and a second F and gas (four) layer rain, an outer casing 130, a water absorbing material layer A fan 150 that produces a gas flow in a month. Cathode porous collector layer 104 * Xikong collector layer 106 is disposed on the film electrode group 1Q2 two M383209 months @-28

Fill the I side. The gas barrier material layer 108 is disposed on one side of the cathode porous collector layer 1〇4 and has at least one opening 116. Specifically, the gas barrier material layer 1〇8 is disposed on the surface of the hydrophobic porous material layer 202, and the surface of the hydrophobic porous material layer 202 is exposed by the opening 116. The outer casing 13〇 is disposed on one side of the thin film electrode assembly 102, the gas barrier material layer 1〇8 is disposed between the outer casing 13〇 and the thin film electrode group 102, and the gas flow channel A is located at the gas barrier material layer 1〇8 and is redundant. Between 130. The water absorbing material layer 16 is disposed on the outer casing 13A, and the water absorbing material layer 160 in the basin is interposed between the outer casing 130 and the gas barrier material layer ι8. Air flows into the gas flow path a from the gas inlet A1 of the gas flow path A, and is discharged from the gas outlet A2. 7A and 7B are perspective views of the planar type fuel cell stack of Fig. 6. Referring to FIG. 7A and FIG. 7B, in the planar fuel cell stack 2, after a long period of operation, an oxide is formed on the surface of the cathode catalyst layer 113. Therefore, in order to secure the planar fuel cell stack 2 The effectiveness of the planar fuel cell stack 200' needs to be activated. When an oxide is generated on the surface of the cathode catalyst layer U3, the activity of the cathode catalyst layer 113 is reduced, and the efficiency of the planar fuel cell stack 200 is also lowered. In order to activate a planar fuel cell stack, one of ordinary skill in the art can stop supplying air to the cathode so that the fuel crosses the membrane electrode assembly 1〇2 so that the cathode is reduced. In the present embodiment, the activation of the planar fuel cell stack 2 can be achieved only by the action of turning off the fan 150, and A2 is not required. In this case, the actual _-_ is fully tested in Figures 7A and 7B). When the fan 150 is turned off, the oxygen in the gas flow path A is gradually depleted. If the distance X is long enough, the amount of helium gas diffused into the gas flow path from the gas outlet A2 will be insufficient. At this time, the planar fuel cell stack 200 can be smoothly activated. The amount of oxygen in the gas flow path can be estimated by the following diffusion formula (2):

J = -D~A ^ (2), where 'J is the amount of oxygen that does not diffuse into the gas flow channel, the unit of which is mole/s ' D represents the diffusion coefficient, the unit is cm2/s, and in general, The oxygen diffusion coefficient in air is about 2-.2-0.3cm2/s, Ac means the concentration difference, the unit is mole/cm3, and under the normal temperature of one atmosphere, about 8.6xl 一 in one cubic centimeter - 6 mole of oxygen, indicating the distance of the diffusion path, the unit is in centimeters ' and A represents the cross-sectional area of the gas outlet. For example, when the planar fuel cell stack 2 is in operation, the amount of fuel across the membrane electrode assembly 1〇2 is typically greater than 5 [xm〇b/cm2/min, and the required oxygen content needs to be greater than 7.5fxmole/cm2/min. In the present embodiment, the rice setting A is 8.6 x 〇 _6 m 〇 le / cm 3 , and the relationship between the area of the thin film electrode group and a / is also shown in Fig. 8 . Specifically, the ratio of the area of the thin film electrode group illustrated in Fig. 8 to the A/office is about 〇〇73. It is noted that the gas outlet = any shape, and the number of gas outlets may be one or more. The μ is a thin film electrode group, and the gas outlet can be exaggerated when looking for the length of the square-shaped electrode group iQ2, 9 . Further, the relationship between the area of the leaf and the electrode group and the d/zbc, which is illustrated in the drawings, has at least one of the following advantages. 99. 4. 2 years Months Supplement 丨 · The creation method of this creation is relatively simple, and the entire fuel cell system and the required components are small, so the manufacturing cost can be saved. With #1·This creation does not need to change the internal structure of the current thin film electrode set, and the water recovery of the cathode catalyst layer can be performed in a single and effective manner. Ancient, shouting 3. This creation can use a high concentration of fuel to carry out the reaction, so that the energy conversion efficiency of the material can be improved. Anyone who has the usual knowledge in the technical field can make some changes and (4) decorations without departing from the creation, fine 2 and the surrounding area. Therefore, the scope of this creation protection shall be subject to the definition of the patent application. . BRIEF DESCRIPTION OF THE DRAWINGS The structure of a planar fuel cell stack according to an embodiment of the present invention is another embodiment of the creation of a junction of a planar fuel cell stack according to another embodiment - Planar Fuel Cell Group FIG. 3 is a diagram showing the evaporation mechanism of water generated by the planar side of the present invention. The cathode catalyst layer of the battery pack Fig. 4 is a schematic view showing the structure of the pool group according to another embodiment of the present invention. Fig. 5 is a schematic view showing the structure of a pool group according to still another embodiment of the present invention. (3) Non-planar fuel power Figure 6 is a plan view of the creation-embodiment. Fig. 7A and Fig. 7B are the vertical type of the battery pack of Fig. 6;

M383209 Fig. 8 is a graph showing the relationship between the area of the thin film electrode group and Α/Δχ. Fig. 9 is a graph showing the relationship between the area of the thin film electrode group and d/Δχ. [Description of main component symbols] 100, 100a, 100', 200, 200': planar fuel cell stack 102: thin film electrode set 104: cathode porous collector layer 106: anode porous collector layer 108, 108': gas barrier material Layer 110: proton conducting membrane 111: anode catalyst layer 112: anode gas diffusion layer 113: cathode catalyst layer 114: cathode gas diffusion layer 116, 116', 124: openings 118, 120, 128: evaporation path 122 gas barrier Material layer 126 Surrounding area 130 Housing 140 Airflow baffle 150 Fan 160 Water absorbing material layer 202, 202': Hydrophobic porous material layer A: Gas flow path A1: Gas inlet A2: Gas outlet

Claims (1)

99; 4? Su Bu no i VI. Patent application scope: L—a planar fuel cell stack, comprising: a thin film electrode set; a cathode porous collector layer; an anode porous collector layer, wherein the cathode porous collector layer And the anode D-hole collector layer is disposed on both sides of the film electrode group; forming a gas barrier material layer disposed on one side of the cathode porous collector layer, and having at least the cathode current collector layer exposed An outer surface is disposed on one side of the thin film electrode assembly, wherein the gas barrier material is disposed only between the outer casing and the thin film electrode assembly, and a gas flow path is located at the gas barrier material layer and the outer casing And at least one air baffle disposed in the gas flow path. 2. The planar fuel cell of claim 2, wherein the thin film electrode set comprises a proton conducting membrane, an anode catalyst layer, a cathode catalyst layer, an anode gas diffusion layer, and a a cathode gas diffusion layer 'where the anode catalyst layer and the cathode catalyst layer are respectively disposed on both sides of the proton conductive membrane' and the anode gas diffusion layer and the cathode gas diffusion layer are respectively disposed on the anode catalyst layer and the cathode gas diffusion layer On the cathode catalyst layer. 3. The planar fuel cell stack according to claim 1, wherein the opening has a diameter of DI, and the gas barrier layer has a thickness of τ, and DI > 2T. 4. The planar fuel cell stack of claim 1, further comprising a layer of water absorbing material disposed on the outer casing, wherein the layer of water absorbing material is between the outer casing and the gas barrier material layer. 24 M383209 5. The planar fuel cell stack of claim 1, further comprising a fan for generating a gas stream, wherein the gas stream flows from a gas inlet of the gas channel to the gas channel a gas outlet. 6. The planar fuel cell stack of claim 1, wherein the outer casing is a gas impermeable casing. 7. The planar fuel cell stack of claim 1, wherein the airflow baffle is disposed on the gas barrier material layer and extends toward the outer casing. 8. The planar fuel cell stack of claim 1, wherein the airflow baffle is disposed on the outer casing and extends toward the gas barrier material layer. 9. If you apply for the patent scope! The planar fuel cell assembly of the present invention, wherein the gas barrier material layer has an opening ratio of between 5% 5% and 21%. 10. If the scope of the patent is claimed! The planar fuel cell assembly of the present invention, wherein the material of the gas barrier material layer comprises a polyg-polymer or a polyether polymer. U. The planar fuel cell stack according to claim 1G, wherein the polyacetate polymer comprises polyethylene terephthalate (p or polyacrylonitrile (PAN). The planar fuel cell stack according to the above aspect of the invention, wherein the polyanthracene polymer comprises polyethylene (ΡΕ) or polypropylene (ρρ). The fuel cell stack, wherein the thickness of the gas barrier material layer is between 14. The planar fuel cell 25 according to claim 1 of the patent scope of the invention, M383209 4* 2 JF 'Year Month Day @-28 ί There is a gap between the gas barrier material layer and the cathode porous collector layer. 15. The planar fuel cell stack according to claim 14 wherein the gap is less than 1.5 cm. The planar fuel cell stack according to the invention, wherein the gas barrier material layer is in contact with the cathode porous collector layer. 17. The planar fuel cell stack according to claim And further comprising a layer of hydrophobic porous material disposed on the cathode porous set Between the layer and the gas barrier material layer. η 18. The planar fuel cell stack of the invention of claim 17, wherein the hydrophobic porous material layer is comprehensively covered on the cathode porous collector layer. 19. The planar fuel cell stack according to claim 17, wherein the hydrophobic porous material layer is located on the cathode porous collector layer and is exposed by the opening of the gas barrier material layer. The planar fuel cell of claim 17, wherein the layer of hydrophobic porous material comprises polytetrafluoroethylene (pTFE), propylene (PP), or polyethersulfone (pES). 21. A planar fuel cell stack comprising: a thin film electrode assembly; a cathode porous collector layer; an electrical layer and a side of the anode layer, and an anode-anode porous collector layer, wherein the cathode porous collector collects electricity Layers are disposed on both sides of the thin film electrode group; a layer of gas material layer is disposed on the cathode porous collector 26 M383209 Having at least one opening to expose a surface of the cathode porous collector layer; an external device disposed on one side of the thin film electrode group, wherein the gas barrier material layer is disposed between the outer casing and the thin film electrode group And a gas flow path is located between the gas barrier material layer and the outer casing; a water absorbing material layer disposed on the outer casing, wherein the water absorbing material layer is located between the outer casing and the gas barrier material layer; A fan for generating a gas stream, wherein air flows from a gas inlet of the gas flow path to a gas outlet of the gas flow path. The planar fuel cell stack according to claim 21, wherein the thin film electrode assembly comprises a proton conducting membrane, an anode catalyst layer, a cathode catalyst layer, an anode gas diffusion layer, and a cathode. a gas diffusion layer in which the anode catalyst layer and the cathode catalyst layer are respectively disposed on both sides of the proton conductive membrane, and the anode gas diffusion layer and the cathode gas diffusion layer are respectively disposed on the anode catalyst layer and the cathode catalyst On the floor. 23. The planar fuel cell stack according to claim 21, wherein the opening has a diameter DI' and the gas barrier material layer has a thickness of τ, φ and DI > 2T. The flat fuel cell stack of claim 21, wherein the outer casing is a gas-tight casing. 25. The planar fuel cell stack of claim 21, further comprising at least one airflow baffle disposed in the gas flow path. 26. The planar fuel cell stack of claim 25, wherein the airflow baffle is disposed on the gas barrier material layer and extends toward the outer casing. 27 M383209 |99:4. 2 year month p 1 elephant The planar fuel cell stack of claim 25, wherein the airflow baffle is disposed on the outer casing and extends toward the gas barrier material layer. 28. The planar fuel cell of claim 21, wherein the gas barrier material layer has an open cell ratio of between 5% and 21%. 29. The planar fuel cell of claim 21, wherein the material of the gas barrier material layer comprises a polyester polymer or a polyolefin polymer. 30. The planar fuel cell of claim 29, wherein the polyester polymer comprises polyethylene terephthalate (PET) or polyacrylonitrile (PAN). The planar fuel cell stack of claim 29, wherein the polyolefin polymer comprises polyethylene (PE) or polypropylene (PP). The planar fuel cell stack according to claim 21, wherein the gas barrier material layer has a thickness of between 10 μm and 5 μm. The planar fuel cell stack according to claim 21, wherein a gap exists between the gas barrier material layer and the cathode porous collector layer. 34. The planar fuel cell of claim 33, wherein the gap is less than 1.5 cm. The planar fuel cell stack of claim 21, wherein the gas barrier material layer is in contact with the cathode porous collector layer. 36. The planar fuel cell of claim 21, further comprising a layer of hydrophobic porous material disposed on the cathode porous collector 28 M383209 59 Γ 4. 2 years Between the layers and the gas barrier material layer. 37. The planar fuel cell of claim 36, wherein the hydrophobic porous material layer is entirely overlying the cathode porous collector layer. 38. The planar fuel cell of claim 36, wherein the hydrophobic porous material layer is on the cathode porous collector layer and is exposed by the opening of the gas barrier material layer. 39. The planar fuel cell of claim 36, wherein the hydrophobic porous material layer comprises polytetrazol (PTFE), polypropylene (PP), or polyethersulfone (PES). 29 M383209 VII. Figure 1A M383209 ϋ·—2 years The gas barrier material layer is disposed at a side of the cathode porous current collector and has at least one opening for exposing a surface of the cathode porous current collector. The case is disposed at a The side of the MEA, the gas barrier material layer is disposed between the case and the MEA, and an air channel is located between the gas barrier material layer and the case. Additionally, the air baffle disposed within the air channel. Circle: (1) The designated representative figure of the case: Figure ΙΑ (2) The symbol of the symbol of the representative figure is simple: 100: planar fuel cell stack 102: thin film electrode set 104: cathode porous collector layer 106: anode porous collector Layer 108: gas barrier material layer 110: proton conductive membrane 111: anode catalyst layer 112: anode gas diffusion layer 113: cathode catalyst layer 114: cathode gas diffusion layer 116: opening M383209 99. 4. 2 year 130: Outer casing 140: air flow baffle 150: fan 160: water absorbing material layer A: gas flow path A1: gas Body inlet A2: gas outlet