Polar plate, bipolar plate, electric pile and fuel cell

Abstract

The invention discloses a polar plate, a bipolar plate, an electric pile and a fuel cell. The inlet distribution area and the outlet distribution area are positioned on two sides of the reaction area; the first branch opening area is communicated with the reaction area through the inlet distribution area, and the reaction area is communicated with the second branch opening area through the outlet distribution area; wherein the length of the inlet distribution area is smaller than that of the outlet distribution area, so that the pressure drops of the plurality of runners are similar. Therefore, the length of the inlet distribution area is smaller than that of the outlet distribution area, so that the pressure drop of each flow channel on the inlet distribution area is reduced, the pressure drop of each flow channel on the outlet distribution area is increased, the pressure drop amplitude of different flow channels on the inlet distribution area is different, and the pressure drop amplitude of different flow channels on the outlet distribution area is different, so that dynamic adjustment is realized; therefore, the pressure drops among the runners are closer, and the flow uniformity of reactants in the polar plate is improved.

Description

Technical Field

[0001] The present invention relates to the field of battery technology, and in particular to a polar plate, a bipolar plate, a battery stack and a fuel cell. Background Art

[0002] The electrode plate is one of the key components of a fuel cell. It can be used to separate the oxidant, reductant and coolant, and can evenly distribute the reactants to each electrode in the flow field through the flow channel.

[0003] In the related art, the pressure drop of each flow channel in the distribution area on the electrode plate is greatly different, which leads to a large difference in the pressure drop of each flow channel in the reaction area, resulting in poor uniformity of the reactant flow rate, affecting the electrical performance of the fuel cell. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, one object of the present invention is to provide a plate to reduce the difference in pressure drop of each flow channel and improve the flow uniformity of reactants.

[0005] According to an embodiment of the present invention, the electrode plate includes: a reaction zone; an inlet distribution zone and an outlet distribution zone, wherein the inlet distribution zone and the outlet distribution zone are located on both sides of the reaction zone; a first branching zone and a second branching zone, wherein the first branching zone is connected to the reaction zone through the inlet distribution zone, and the reaction zone is connected to the second branching zone through the outlet distribution zone; wherein the length of the inlet distribution zone is smaller than the length of the outlet distribution zone, so that the pressure drops of the multiple flow channels on the inlet distribution zone and the multiple flow channels on the outlet distribution zone are similar.

[0006] According to the electrode plate of the present invention, the length of the inlet distribution area is made smaller than the length of the outlet distribution area to reduce the pressure drop of each flow channel on the inlet distribution area, increase the pressure drop of each flow channel on the outlet distribution area, and the pressure drop reduction amplitudes of different flow channels on the inlet distribution area are different, and the pressure drop increase amplitudes of different flow channels on the outlet distribution area are different, so as to realize dynamic adjustment, make the pressure drops between each flow channel closer, improve the flow uniformity of the reactants in the electrode plate, improve the electrical performance of the fuel cell, and improve the service life of the fuel cell.

[0007] According to some embodiments of the present invention, the first manifold area includes a first hydrogen manifold, a first coolant manifold, and a first air manifold arranged in sequence along a first direction; the second manifold area includes a second air manifold, a second coolant manifold, and a second hydrogen manifold arranged in sequence along the first direction; wherein the length of the inlet distribution area in the second direction is smaller than the length of the outlet distribution area in the second direction, and the first direction is orthogonal to the second direction.

[0008] According to some embodiments of the present invention, the length of the entrance distribution area is defined as H1, the length of the exit distribution area is defined as H2, the reference length H3=(H1+H2) / 2, the entrance distribution area change L1 is H3-H1, the exit distribution area change L2 is H2-H3, and L1≥L2.

[0009] According to some embodiments of the present invention, L1=L2.

[0010] According to some embodiments of the present invention, L1>L2.

[0011] Another object of the present invention is to provide a bipolar plate.

[0012] The bipolar plate according to the present invention comprises: two polar plates as described above, and the polar plates are stacked.

[0013] The bipolar plate has the same advantages as the above-mentioned polar plate, which will not be described in detail here.

[0014] Another object of the present invention is to provide a fuel cell stack.

[0015] The battery stack according to the present invention comprises the above-mentioned polar plates, wherein the polar plates comprise cathode plates and anode plates; the battery stack further comprises a membrane electrode, wherein the anode plate, the membrane electrode and the cathode plate are stacked in sequence.

[0016] The advantages of the battery stack are the same as those of the above-mentioned bipolar plate, which will not be elaborated here.

[0017] Another object of the present invention is to provide a fuel cell.

[0018] The fuel cell according to the present invention comprises the above-mentioned fuel cell stack; the fuel cell further comprises: a hydrogen system and an air system, and the fuel cell stack is connected to the hydrogen system and the air system respectively.

[0019] The advantages of the fuel cell are the same as those of the above-mentioned fuel cell stack, which will not be elaborated here.

[0020] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0022] Figure 1 A schematic diagram of the structure of a plate of the related art;

[0023] Figure 2 It is a schematic diagram of the structure of the electrode plate described in an embodiment of the present invention.

[0024] Reference numerals:

[0025] Related technology: plate 200, reaction area 210, inlet distribution area 220, outlet distribution area 230,

[0026] The first manifold area 240, the first hydrogen manifold 241, the first coolant manifold 242, the first air manifold 243,

[0027] The second manifold area 250, the second air manifold 251, the second coolant manifold 252, the second hydrogen manifold 253,

[0028] The first inlet flow channel 261, the first outlet flow channel 262,

[0029] A second inlet flow channel 271 and a second outlet flow channel 272 .

[0030] This application:

[0031] Plate 100, reaction zone 110, inlet distribution zone 120, outlet distribution zone 130,

[0032] The first manifold area 140, the first hydrogen manifold 141, the first coolant manifold 142, the first air manifold 143,

[0033] The second manifold area 150, the second air manifold 151, the second coolant manifold 152, the second hydrogen manifold 153,

[0034] The first inlet flow channel 161, the first outlet flow channel 162,

[0035] A second inlet flow channel 171 and a second outlet flow channel 172 . DETAILED DESCRIPTION

[0036] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0037] In the description of the present invention, "plurality" means two or more.

[0038] Reference below Figure 2 A plate 100 according to an embodiment of the present invention is described.

[0039] The electrode plate 100 according to the present invention includes: a reaction zone 110; an inlet distribution zone 120 and an outlet distribution zone 130, wherein the inlet distribution zone 120 and the outlet distribution zone 130 are located on both sides of the reaction zone 110; the first branching zone 140 is connected to the reaction zone 110 through the inlet distribution zone 120, and the reaction zone 110 is connected to the second branching zone 140 through the outlet distribution zone 130; wherein the length of the inlet distribution zone 120 is smaller than the length of the outlet distribution zone, so that the pressure drops of multiple flow channels on the inlet distribution zone 120 and the outlet distribution zone 130 are similar.

[0040] like Figure 2 As shown, specifically, the inlet distribution area 120 and the outlet distribution area 130 are spaced apart in the second direction, the reaction zone 110 is arranged between the inlet distribution area 120 and the outlet distribution area 130, the first branch area 140 is arranged on the side of the inlet distribution area 120 away from the reaction zone 110, and the second branch area 150 is arranged on the side of the outlet distribution area 130 away from the reaction zone 110.

[0041] Furthermore, the inlet distribution area 120 is provided with multiple flow channels, and the lengths of the multiple flow channels are different. The inlet distribution area 120 is connected to the first branch area 140 through the multiple flow channels. The outlet distribution area 130 is provided with multiple flow channels, and the lengths of the multiple flow channels are different. The outlet distribution area 130 is connected to the second branch area 150 through the multiple flow channels. At the same time, the inlet distribution area 120 and the outlet distribution area 130 are both connected to the reaction area 110, thereby realizing the connection between the first branch area 140, the inlet distribution area 120, the reaction area 110, the outlet distribution area 130 and the second branch area 150.

[0042] The flow channels of the inlet distribution area 120 and the outlet distribution area 130 are used to distribute the reactants so that the reactants entering the reaction area 110 are more evenly distributed, thereby ensuring that the electrochemical reaction in the reaction area 110 can proceed sufficiently evenly and improving the electrical performance of the fuel cell.

[0043] It should be noted that the closer the pressure drops of the multiple flow channels in the inlet distribution area 120 and the outlet distribution area 130 are, the closer the pressure drops of the flow channels in the reaction area 110 are, the better the flow uniformity of the reactants is, and the better the electrical performance of the fuel cell is.

[0044] According to the pressure drop formula: △P=Rf*m, where △P is the pressure drop, Rf is the flow resistance, and m is the mass flow rate. Rf is proportional to the length of the flow channel. Therefore, the longer the flow channel, the greater the flow resistance, the greater the pressure drop, and after the electrochemical reaction occurs in the reaction zone 110, the mass of the reactant (such as hydrogen) decreases, and the mass of the reactant at the outlet distribution zone 130 is less than the mass of the reactant at the inlet distribution zone 120.

[0045] like Figure 1As shown, in the related art, the length of the inlet distribution area 220 is the same as that of the outlet distribution area 230, which results in the flow channel length of the inlet distribution area 220 being the same as the flow channel length arranged in parallel with the outlet distribution area 230, and because the mass of the reactant at the inlet distribution area 220 is greater than the mass of the reactant at the outlet distribution area 230, the pressure drop difference of each flow channel is relatively large, resulting in poor flow uniformity of the reactant 210, affecting the electrical performance of the fuel cell.

[0046] like Figure 2 As shown, the present application reduces the length of multiple flow channels on the inlet distribution area 120 and increases the length of multiple flow channels on the outlet distribution area 130 by making the length of the inlet distribution area 120 smaller than the length of the outlet distribution area 130, and the mass of the reactants at the inlet distribution area 120 is greater than the mass of the reactants at the outlet distribution area, thereby making the pressure drops of each flow channel closer. The closer the pressure drops of each flow channel in the reaction area 110 are, the higher the flow uniformity of the reactants in the electrode plate 100 is, the better the electrical performance of the fuel cell is, and the service life of the fuel cell can be increased.

[0047] According to the electrode plate 100 of the present invention, the length of the inlet distribution area 120 is made smaller than the length of the outlet distribution area 130, so as to reduce the pressure drop of each flow channel on the inlet distribution area 120, increase the pressure drop of each flow channel on the outlet distribution area 130, and the pressure drop reduction amplitudes of different flow channels on the inlet distribution area 120 are different, and the pressure drop increase amplitudes of different flow channels on the outlet distribution area 130 are different, so as to realize dynamic adjustment, make the pressure drops between each flow channel closer, improve the flow uniformity of the reactants in the electrode plate 100, improve the electrical performance of the fuel cell, and can increase the service life of the fuel cell.

[0048] like Figure 2 As shown, in some embodiments of the present invention, the first manifold area 140 includes a first hydrogen manifold 141, a first coolant manifold 142 and a first air manifold 143 arranged in sequence along the first direction, and the second manifold area 150 includes a second air manifold 151, a second coolant manifold 152 and a second hydrogen manifold 153 arranged in sequence along the first direction; wherein the length of the inlet distribution area 120 in the second direction is smaller than the length of the outlet distribution area 130 in the second direction, so that the pressure drops of the multiple flow channels are similar, and the first direction is orthogonal to the second direction.

[0049] It should be noted that the “first direction” refers to the width direction of the electrode plate 100, that is, Figure 2 From left to right, the “second direction” refers to the length direction of the electrode plate 100, i.e. Figure 2 The direction from top to bottom is shown in the figure. For specific directions, please refer to Figure 2 shown.

[0050] Specifically, the first hydrogen manifold 141, the first coolant manifold 142 and the first air manifold 143 can be connected to the inlet distribution area 120 through multiple flow channels, and the inlet distribution area 120 is connected to the reaction area 110, so that the first hydrogen manifold 141, the first coolant manifold 142 and the first air manifold 143 can be connected to the reaction area 110, and the second hydrogen manifold 153, the second coolant manifold 152 and the second air manifold 151 are connected to the outlet distribution area 130 through multiple flow channels, and the outlet distribution area 130 is connected to the reaction area 110, so that the second hydrogen manifold 153, the second coolant manifold 152 and the second air manifold 151 are connected to the reaction area 110.

[0051] One of the multiple flow channels in the inlet distribution area 120 is defined as the first inlet flow channel 161, and another of the multiple flow channels is defined as the second inlet flow channel 171. The flow channel in the outlet distribution area 130 connected with the first inlet flow channel 161 is defined as the first outlet flow channel 162, and the flow channel connected with the second inlet flow channel 171 is defined as the second outlet flow channel 172. The first inlet flow channel 161 and the second outlet flow channel 172 are arranged in parallel, and the first outlet flow channel 162 and the second inlet flow channel 171 are arranged in parallel, wherein the length of the first inlet flow channel 161 is different from the length of the second inlet flow channel 171, and when the size of the first inlet flow channel 161 is smaller than the size of the second inlet flow channel 171, the size of the first outlet flow channel 162 is larger than the size of the second outlet flow channel 172, the first inlet flow channel 161 and the first outlet flow channel 162 together constitute a first flow channel, and the second inlet flow channel 171 and the second outlet flow channel 172 together constitute a second flow channel.

[0052] That is to say, the flow channels include the first flow channel to the Nth flow channel which are arranged in sequence in the width direction, the first hydrogen manifold 141 and the second hydrogen manifold are respectively located in the diagonal direction of the electrode plate 100, and the first air manifold 143 and the second air manifold 151 are respectively located in the diagonal direction of the electrode plate 100. Therefore, the length of the first flow channel led out from the first hydrogen manifold 141 is the shortest, while the length of the Nth flow channel is the longest. The length of the first flow channel led out from the second hydrogen manifold 153 is the longest, and the length of the Nth flow channel is the shortest. The closer the pressure drops between the first flow channel and the Nth flow channel and other multiple flow channels are, the better the performance of the fuel cell is.

[0053] Furthermore, the length of the inlet distribution area 120 in the second direction is smaller than the length of the outlet distribution area in the second direction, so that the length of the multiple flow channels on the inlet distribution area 120 is smaller than the length of the multiple flow channels on the outlet distribution area 130, so as to reduce the pressure drop of the first inlet flow channel 161 and the pressure drop of the second inlet flow channel 171, and increase the pressure drop of the first outlet flow channel 162 and the second outlet flow channel 172. In the inlet flow channel area, the second inlet flow channel 172 is longer, and the pressure drop of the first inlet flow channel 161 is smaller than the pressure drop of the second inlet flow channel 172. In the outlet flow channel area, the length of the first outlet flow channel 162 is longer, and the length of the second outlet flow channel 172 is shorter, and the pressure drop of the second outlet flow channel 172 is smaller than the pressure drop of the first outlet flow channel 162, so that the pressure drop of the first flow channel is closer to the pressure drop of the second flow channel, and the closer the pressure drops of the flow channels in the reaction zone 110 are, the better the flow uniformity of the reactants in the electrode plate 100 is, the better the electrical performance of the fuel cell is, and the service life of the fuel cell can be improved.

[0054] like Figure 2 As shown, in some embodiments of the present invention, the length of the inlet distribution area 120 is defined as H1, the length of the outlet distribution area 130 is defined as H2, the reference length H3 = (H1 + H2) / 2, the change L1 of the inlet distribution area 120 is H3 - H1, the change L2 of the outlet distribution area 130 is H2 - H3, and L1 ≥ L2.

[0055] It should be noted that the reference length H3 can be understood as the length dimension when the lengths of the inlet distribution area 220 and the outlet distribution area 230 are the same in the related art.

[0056] Specifically, the length of inlet distribution area 120 decreases relative to the reference length, and the length of outlet distribution area 130 increases relative to the reference length. The mass of the reactant at inlet distribution area 120 is defined as M1, and the mass of the reactant at outlet distribution area 130 is defined as M2.

[0057] Taking the first flow channel and the second flow channel among the multiple flow channels as an example, the width of the reaction zone 110 is defined as A, the pressure drop of the first inlet flow channel 161 is defined as △P1, the pressure drop of the first outlet flow channel 162 is defined as △P1', the pressure drop of the second inlet flow channel 171 is defined as △P2, and the pressure drop of the second outlet flow channel 172 is defined as △P2'. Since Rf is proportional to the flow channel length, Rf can be directly substituted into the flow channel length.

[0058] Reference Figure 1, the width of the reaction zone 210 in the related art is defined as A, the pressure drop of the first inlet flow channel 261 is defined as △Pa, the pressure drop of the first outlet flow channel 262 is defined as △Pa', the pressure drop of the second inlet flow channel 271 is defined as △Pb, the pressure drop of the second outlet flow channel 272 is defined as △Pb', the mass of the reactant at the inlet distribution area 220 is M1, and the mass of the reactant at the outlet distribution area 230 is M2,

[0059] Among them, since H1<H3<H2, Thereby, the pressure drop of the first inlet flow channel 161 and the pressure drop of the second inlet flow channel 171 are reduced, and the pressure drop of the first inlet flow channel 161 and the pressure drop of the second inlet flow channel 171 can be made closer. The pressure drop of the first outlet flow channel 162 and the pressure drop of the second outlet flow channel 172 are increased, and the difference between the pressure drop of the first inlet flow channel 161 and the pressure drop of the second inlet flow channel 171 is increased. Since M1>M2, the values ​​of the reduced pressure drop of the first inlet flow channel 161 and the pressure drop of the second inlet flow channel 171 are greater than the values ​​of the increased pressure drop of the first outlet flow channel 162 and the pressure drop of the second outlet flow channel 172, so that the pressure drop values ​​of each flow channel are closer. The closer the pressure drops of each flow channel in the reaction zone 110 are, the higher the flow uniformity of the reactants in the electrode plate 100 is, the better the electrical performance of the fuel cell is, and the service life of the fuel cell can be increased.

[0060] In addition, the length of the electrode plate 100 is certain (it can be understood that it is constructed to be the same as the length of the electrode plate 200 in the related art), L1>L2, the length dimension of the inlet distribution area 120 that is reduced relative to the reference length can be greater than the length dimension of the outlet distribution area 130 that is increased relative to the reference length, so as to reduce the space occupied by the distribution area, and at the same time increase the space occupied by the reaction area 110, and the time for the reactants to pass through the reaction area 110 is increased, so that the reactants can further fully undergo electrochemical reactions, thereby further improving the electrical performance and service life of the fuel cell.

[0061] Optionally, the reduced length dimension of the inlet distribution area 120 relative to the reference length can be the same as the increased length dimension of the outlet distribution area 130 relative to the reference length, so as to ensure that the length of the reaction area 110 is constant (which can be understood as the same as the length of the reaction area 210 on the electrode plate 200 in the related art), and prevent the layout space of the reaction area 110 from being reduced due to the distribution area occupying the layout space of the reaction area 110, thereby preventing the reactants from being unable to fully undergo electrochemical reactions and ensuring the reaction effect of the reactants. The specific size settings of L1 and L2 can be determined through simulation experiments and are not specifically limited here.

[0062] Therefore, the present application makes the length of the inlet distribution area 120 smaller than the length of the outlet distribution area 130 to reduce the difference in the pressure drop of each flow channel in the inlet distribution area 120 and the outlet distribution area 130. There is no need to repeatedly and precisely design the flow channels in the distribution area, thereby reducing the difference in pressure drop of each flow channel in the reaction area 110, improving the flow uniformity of the reactants, and improving the electrical performance of the fuel cell. It can effectively shorten the design cycle of the electrode plate 100 and reduce the processing cost of the electrode plate 100.

[0063] In some embodiments of the present invention, L1 = L2.

[0064] Specifically, the length dimension of the inlet distribution area 120 that is reduced relative to the reference length can be the same as the length dimension of the outlet distribution area 130 that is increased relative to the reference length, thereby preventing the layout space of the reaction area 110 from becoming smaller due to the distribution area occupying the layout space of the reaction area 110, thereby ensuring the reaction effect of the reactants.

[0065] In some embodiments of the present invention, L1>L2.

[0066] Specifically, when the length of the electrode plate 100 of the present invention is constructed to be the same as the length of the electrode plate 200 in the related art, L1 can be greater than L2, that is, the change in the inlet distribution area 120 can be greater than the change in the outlet distribution area 130, so as to reduce the length dimension of the distribution area and increase the length dimension of the reaction area 110 at the same time, thereby increasing the time for the reactants to flow through the reaction area 110, so that the reactants can fully undergo electrochemical reactions, thereby improving the electrical performance and service life of the fuel cell.

[0067] The bipolar plate according to the present invention comprises two polar plates 100 as described above, and the polar plates 100 are stacked.

[0068] Specifically, one of the two plates 100 is configured as an anode plate, and the other of the two plates 100 is configured as a cathode plate. The cathode plate and the anode plate have the same structure, and the cathode plate and the anode plate are stacked. The inlet distribution area 120 of the anode plate can correspond to the inlet distribution area 130 of the cathode plate. Under this structure, a first hydrogen manifold 141, a first coolant manifold 142, and a first air manifold 143 are formed at one end of the same side of the anode plate and the cathode plate, and a second air manifold 151, a second coolant manifold 152, and a second hydrogen manifold 153 are formed at the other end of the same side of the anode plate and the cathode plate. A flow channel is formed between the bipolar plates so that the oxidant, the reductant and the coolant can flow on the bipolar plates.

[0069] In addition, the outlet distribution area 130 of the cathode plate corresponds to the inlet distribution area 120 of the anode plate, that is, under this structure, one end of the anode plate formed with the first hydrogen manifold 141, the first coolant manifold 142, and the first air manifold 143 corresponds to one end of the cathode plate formed with the second air manifold 151, the second coolant manifold 152, and the second hydrogen manifold 153. The specific stacking method of the anode plate and the cathode plate can be determined according to the actual design requirements of the bipolar plate, and is not specifically limited here.

[0070] According to the bipolar plate of the present invention, since the bipolar plate includes the above-mentioned electrode plate 100, the length of the inlet distribution area 120 is made smaller than the length of the outlet distribution area 130 to reduce the pressure drop of each flow channel on the inlet distribution area 120, and increase the pressure drop of each flow channel on the outlet distribution area 130, and the pressure drop reduction amplitudes of different flow channels on the inlet distribution area 120 are different, and the pressure drop increase amplitudes of different flow channels on the outlet distribution area 130 are different, so as to realize dynamic adjustment, make the pressure drops between each flow channel closer, improve the flow uniformity of the reactants in the electrode plate 100, improve the electrical performance of the fuel cell, and can improve the service life of the fuel cell.

[0071] The battery stack according to the present invention includes the above-mentioned electrode plate 100, and the electrode plate 100 includes a cathode plate and an anode plate. The battery stack also includes a membrane electrode, and the anode plate, the membrane electrode and the cathode plate are stacked in sequence.

[0072] Specifically, the fuel cell stack is provided with a cathode plate, an anode plate and a membrane electrode, which are arranged in the order of anode plate, membrane electrode, cathode plate and membrane electrode. Each membrane electrode is sandwiched between an anode plate and a cathode plate. Hydrogen passes into the anode plate, and the flow channel on the anode plate transports the hydrogen to the anode. Oxygen passes into the cathode plate, and the cathode plate flow channel transports the oxygen to the cathode. The oxygen is reduced, and the membrane electrode can convert the chemical energy of the hydrogen into electrical energy, so that the fuel cell stack can play the role of providing actual voltage in the fuel cell.

[0073] According to the fuel cell stack of the present invention, since the fuel cell stack includes the above-mentioned electrode plate, by making the length of the inlet distribution area 120 smaller than the length of the outlet distribution area 130, the pressure drop of each flow channel on the inlet distribution area 120 is reduced, and the pressure drop of each flow channel on the outlet distribution area 130 is increased, and the pressure drop reduction amplitudes of different flow channels on the inlet distribution area 120 are different, and the pressure drop increase amplitudes of different flow channels on the outlet distribution area 130 are different, so as to realize dynamic adjustment, make the pressure drops between each flow channel closer, improve the flow uniformity of the reactants in the electrode plate 100, ensure the performance and stability of the fuel cell stack, which is beneficial to improve the electrical performance of the fuel cell, and can increase the service life of the fuel cell. At the same time, the membrane electrode converts the chemical energy of hydrogen into electrical energy, so that the fuel cell stack can play the role of providing actual voltage in the fuel cell.

[0074] The fuel cell according to the present invention comprises the above-mentioned fuel cell stack; the fuel cell further comprises: a hydrogen system and an air system, and the fuel cell stack is connected to the hydrogen system and the air system respectively.

[0075] Specifically, hydrogen is stored in the hydrogen system, which can process the stored hydrogen and pass the processed hydrogen into the anode plate of the fuel cell stack. Hydrogen can be used as a reactant to undergo an electrochemical reaction in the fuel cell stack, and the hydrogen system can adjust the flow rate and pressure of hydrogen at the inlet of the fuel cell stack to achieve the recycling of hydrogen and water balance management inside the fuel cell stack.

[0076] In addition, the fuel cell is also equipped with an air system, which can provide the fuel cell with sufficient air at appropriate pressure so that the fuel cell stack can maintain efficient operation.

[0077] According to the fuel cell of the present invention, since the fuel cell is provided with a hydrogen system, an air system and the above-mentioned stack, the air system provides sufficient air at an appropriate pressure so that the stack can maintain efficient operation, the hydrogen system can adjust the flow and pressure of hydrogen to achieve the recycling of hydrogen and the water balance management inside the stack, and the stack is provided with an anode plate, a membrane electrode and a cathode plate. By making the length of the inlet distribution area 120 in the second direction smaller than the length of the outlet distribution area 130 in the second direction, the pressure drop of each flow channel on the inlet distribution area 120 is reduced, and the pressure drop of each flow channel on the outlet distribution area 130 is increased, and the pressure drop of different flow channels on the inlet distribution area 120 is different, and the pressure drop increase of different flow channels on the outlet distribution area 130 is different, so as to achieve dynamic adjustment, make the pressure drop between each flow channel closer, improve the flow uniformity of the reactants in the plate 100, improve the electrical performance of the fuel cell, and can improve the service life of the fuel cell.

[0078] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0079] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A plate, characterized in that: include: Reaction zone (110); an inlet distribution area (120) and an outlet distribution area (130), wherein the inlet distribution area (120) and the outlet distribution area (130) are located on both sides of the reaction area (110); a first branching zone (140) and a second branching zone (150), wherein the first branching zone (140) is connected to the reaction zone (110) through the inlet distribution zone (120), and the reaction zone (110) is connected to the second branching zone (140) through the outlet distribution zone (130); The length of the inlet distribution area (120) is smaller than the length of the outlet distribution area, so that the pressure drops of the multiple flow channels on the inlet distribution area (120) and the outlet distribution area (130) are similar.

2. The electrode plate according to claim 1, characterized in that: The first manifold area (140) comprises a first hydrogen manifold (141), a first coolant manifold (142) and a first air manifold (143) which are sequentially arranged along a first direction; The second manifold area (150) comprises a second air manifold (151), a second coolant manifold (152) and a second hydrogen manifold (153) which are sequentially arranged along the first direction; wherein The length of the inlet distribution area (120) in the second direction is smaller than the length of the outlet distribution area (130) in the second direction, and the first direction is orthogonal to the second direction.

3. The electrode plate according to claim 1, characterized in that: The length of the inlet distribution area (120) is defined as H1, the length of the outlet distribution area (130) is defined as H2, the reference length H3=(H1+H2) / 2, the change L1 of the inlet distribution area (120) is H3-H1, the change L2 of the outlet distribution area (130) is H2-H3, and L1≥L2.

4. The electrode plate according to claim 3, characterized in that: L1=L2.

5. The electrode plate according to claim 3, characterized in that And, L1>L2.

6. A bipolar plate, characterized in that: include: Two polar plates according to any one of claims 1 to 5, wherein the polar plates are stacked.

7. A battery stack, characterized in that: The electrode comprises a plate according to any one of claims 1 to 5, wherein the plate comprises a cathode plate and an anode plate; The battery stack further includes a membrane electrode, and the anode plate, the membrane electrode and the cathode plate are stacked in sequence.

8. A fuel cell, characterized in that: include: The battery stack as claimed in claim 7; The fuel cell further includes: a hydrogen system and an air system, and the fuel cell stack is communicated with the hydrogen system and the air system respectively.

Images