CN220753484U - Fuel cell electrode plate and fuel cell thereof - Google Patents
Fuel cell electrode plate and fuel cell thereof Download PDFInfo
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- CN220753484U CN220753484U CN202321492019.3U CN202321492019U CN220753484U CN 220753484 U CN220753484 U CN 220753484U CN 202321492019 U CN202321492019 U CN 202321492019U CN 220753484 U CN220753484 U CN 220753484U
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- 239000000446 fuel Substances 0.000 title claims abstract description 133
- 239000007800 oxidant agent Substances 0.000 claims abstract description 39
- 230000001590 oxidative effect Effects 0.000 claims abstract description 39
- 239000002826 coolant Substances 0.000 claims abstract description 33
- 239000000498 cooling water Substances 0.000 claims abstract description 20
- 239000012528 membrane Substances 0.000 claims description 10
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- 238000001816 cooling Methods 0.000 description 17
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- 239000001257 hydrogen Substances 0.000 description 13
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Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
Abstract
The utility model discloses a fuel cell polar plate and a fuel cell thereof, the fuel cell polar plate comprises: a gas flow field, an oxidant inlet, an oxidant outlet, a coolant inlet, a coolant outlet, a fuel inlet, and a cooling water flow field; the gas flow field is arranged at one side of the fuel cell polar plate; the cooling water flow field is arranged on the other side of the fuel cell polar plate; the oxidant inlet, the coolant inlet and the fuel outlet are arranged at one end of the fuel cell polar plate in parallel; the oxidant outlet, the coolant outlet and the fuel inlet are arranged at the other end of the fuel cell polar plate in parallel. The utility model realizes the improvement of the fluid flow velocity in the polar plate flow field through the design of the flow channel structural parameter, on one hand, the manufacturing difficulty and the cost of the bipolar plate can be reduced, and on the other hand, the increase of the fluid flow velocity in the flow channel is realized, the drainage capacity is improved, the performance and the specific power of the fuel cell are improved, and the fuel cell stack is adapted to operate under the working condition of low metering ratio.
Description
Technical Field
The utility model belongs to the technical field of fuel cells, and particularly relates to a fuel cell polar plate and a fuel cell thereof.
Background
A fuel cell is a power generation device that directly converts chemical energy in fuel and oxidant into electrical energy. When the fuel cell works, an anode reactant (such as hydrogen) is input to the anode electrode side, a cathode reactant (such as oxygen) is input to the cathode electrode side, and the anode reactant and the cathode reactant undergo oxidation-reduction reaction at the interface of the electrode and the electrolyte to generate current and output electric energy. Since the fuel cell generates water and emits a large amount of heat during operation, it is necessary to discharge the generated water in time while radiating heat from the fuel cell, which would seriously affect the performance and life of the fuel cell.
The bipolar plate of the fuel cell has the functions of providing reaction medium for electrochemical reaction, such as hydrogen and air, radiating the fuel cell through circulating cooling liquid and discharging water generated in the reaction process, so that the structural design of a flow field of the fuel electrode plate is important, and the structural design of the electrode plate relates to the supply of reactants, the discharge of products and heat of the fuel cell on one hand and directly influences the performance and the reliability of the fuel cell; on the other hand, the structural design of the polar plate directly determines the processing and forming difficulty and manufacturing cost of the polar plate, so that corresponding research on the structural design of the polar plate of the fuel cell is necessary.
Chinese patent (publication No. CN 1287477C) provides a bipolar plate whose flow field length is three to eight times longer than the square root of the area of the bipolar plate. In the utility model, the extension of the length of the flow field is realized through a bent multichannel serpentine structure, the local pressure loss of gas is increased in a bending area, the pressure drop is uneven, and liquid water is not easy to discharge at the bending position due to the rapid change of a fluid space.
Chinese patent (publication No. CN 103636041B) discloses a multi-channel serpentine flow field structure, and a plate structure in which the flow path cross-sectional area of the gas becomes smaller from the upstream of the gas inflow to the downstream of the gas outflow. In the utility model, the flow rate of the gas is improved by reducing the flow passage sectional area of the gas, so that the drainage capacity is improved, but the forming process of the polar plate is greatly challenged, and the manufacturing difficulty and cost of the polar plate are improved.
Chinese patent (publication No. CN 102017253B) discloses a multi-channel serpentine plate having a gradually decreasing cross section, in which a channel-shaped reactant gas flow channel is provided in a curved shape or a mixture of a straight portion and a folded portion from a fluid inflow direction to a fluid outflow direction, a plurality of 90 ° bends are provided, and cross sectional areas of the flow channels in different regions are set to be different. In the utility model, in the area where the flow channel is bent upwards, liquid water generated in the battery is not easy to drain due to the blocking of the wall surface of the flow channel and the action of gravity.
The polar plate of the utility model adopts a gradual change of the sectional area of the flow passage or adopts a bent serpentine flow field structure to construct the flow passage, but also brings the problems of difficult manufacture of the polar plate, increased cost and the like, and the unsuitable flow passage configuration can play an opposite role to form barriers to drainage.
Disclosure of Invention
In view of the above problems, the present utility model discloses a fuel cell plate comprising: a gas flow field, an oxidant inlet, an oxidant outlet, a coolant inlet, a coolant outlet, a fuel inlet, and a cooling water flow field;
the gas flow field is arranged at one side of the fuel cell polar plate;
the cooling water flow field is arranged on the other side of the fuel cell polar plate;
the oxidant inlet, the coolant inlet and the fuel outlet are arranged at one end of the fuel cell polar plate in parallel;
the oxidant outlet, the coolant outlet and the fuel inlet are arranged at the other end of the fuel cell polar plate in parallel.
Still further, the gas flow field includes a plurality of first protrusions and a plurality of first grooves;
the first protrusion and the first groove are arranged at intervals.
Further, the sum of the width of the first protrusion and the width of the first groove is a flow field period P;
the depth of the first groove is d;
wherein P/d is more than or equal to 2.5.
Still further, the cooling water flow field includes a plurality of second protrusions and a plurality of second grooves;
the second protrusion and the second groove are arranged at intervals.
Further, the sum of the width of the second protrusion and the width of the second groove is a flow field period P;
the depth of the second groove is d;
further, the structural parameters of the fuel cell plate include: an included angle theta between the flow field and the horizontal direction, a flow field length a, a flow field width b, a flow field period P, a groove width w and a flow field depth d.
Further, a/b is not less than 1.
Further, P/w is more than or equal to 1.8.
Further, a is equal to or greater than the square root of the total area of the plate.
Further, a.P/(w.d.cos θ) is not less than 300.
The utility model also discloses a fuel cell, which comprises the fuel cell polar plate and the membrane electrode assembly.
Compared with the prior art, the embodiment of the utility model has at least the following advantages:
the flow channel structural parameters are designed to improve the flow velocity of fluid in the polar plate flow field, so that on one hand, the manufacturing difficulty and cost of the bipolar plate can be reduced, on the other hand, the flow velocity of fluid in the flow channel is increased, the drainage capacity is improved, the performance and specific power of the fuel cell are improved, and the fuel cell stack is adapted to operate under the working condition of low metering ratio.
Additional features and advantages of the utility model will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model. The objectives and other advantages of the utility model may be realized and attained by the structure particularly pointed out in the written description and drawings.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the present utility model, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 shows a flow chart of a fuel cell plate structure design method according to an embodiment of the utility model;
FIG. 2 illustrates a schematic cross-sectional view of a fuel cell plate flow field in accordance with an embodiment of the present utility model;
FIG. 3 shows a schematic structural view of a cathode plate according to an embodiment of the utility model;
figure 4 shows a schematic structural view of an anode plate according to an embodiment of the present utility model;
fig. 5 shows a schematic cross-sectional view of a fuel cell according to an embodiment of the utility model;
FIG. 6 shows a flow rate comparison schematic in accordance with an embodiment of the utility model;
FIG. 7 shows a performance versus schematic diagram according to an embodiment of the utility model.
Reference numerals: 1. a gas flow field; 10. an air flow field; 11. a first protrusion; 12. a first groove; 100. a cathode plate; 101. a first oxidant inlet; 102. a first oxidant outlet; 103. a first coolant inlet; 104. a first coolant outlet; 105. a first fuel outlet; 106. a first fuel inlet; 107. a first cooling flow field;
2. a cooling water flow field; 20. a hydrogen flow field; 21. a second protrusion; 22. a second groove; 200. an anode plate; 201. a second oxidant inlet; 202. a second oxidant outlet; 203. a second coolant inlet; 204. a second coolant outlet; 205. a second fuel outlet; 206. a second fuel inlet; 207. a second cooling flow field;
300. a membrane electrode assembly; 301. a cathode side; 302. an anode side;
400. cooling the flow field.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
Fig. 1 shows a flow chart of a fuel cell plate structure design method according to an embodiment of the utility model. As shown in fig. 1, the method for designing the structure of the fuel cell polar plate provided by the utility model comprises the following steps:
step S1: determining the relation between the structural parameters of the polar plate and the fluid flow rate;
step S2: performing preliminary design on the structural parameters;
step S3: determining a flow rate of fluid through the plate;
step S4: determining a flow area of the fluid;
step S5: determining a flow rate of the fluid;
step S6: judging whether the flow rate meets a set threshold value or not; if the flow field of the polar plate is satisfied, the flow field of the polar plate is reasonable in design; if not, the structural parameters of the polar plate are redesigned (i.e. returning to step S2).
Wherein, the relation between the polar plate structural parameter and the fluid flow rate is:
v is the fluid flow rate in the flow field;
a is the flow field length of the discontinuous flow field active region or the path length of fluid circulation in the continuous flow field active region;
b is the flow field width of the discontinuous flow field active region or the channel width of the fluid flowing along the same direction in the continuous flow field active region;
w is the width of the groove;
d is the depth of the flow field;
p is the sum of the width of the protrusion and the width of the groove, i.e., the flow field period;
θ is the included angle between the flow field and the horizontal direction, and θ is more than or equal to 0 degree and less than 90 degrees.
According to the logical relation of the structural parameters of the polar plate: the flow velocity v can be changed by changing the flow field length a, the flow field period P, the flow field width w, the flow field depth d and the included angle theta between the flow field and the horizontal direction of the active region.
The flow velocity of fluid in the flow field is in direct proportion to the flow field period P and in inverse proportion to the flow field depth, so that the purposes of improving the flow velocity of fluid and enhancing the drainage capacity can be achieved by increasing the flow field period P or reducing the flow field depth d, the mass transfer polarization of the galvanic pile is reduced, the output voltage of the galvanic pile is improved, and meanwhile, the galvanic pile can adapt to the operation condition with low metering ratio, and the auxiliary power consumption of the system is reduced.
In some embodiments, the structural parameters include: an included angle theta between the flow field and the horizontal direction, a flow field length a, a flow field width b, a flow field period P, a groove width w and a flow field depth d;
wherein the structural parameters meet the following conditions:
a/b is more than or equal to 1; or (b)
P/w is more than or equal to 1.8; or (b)
P/d is more than or equal to 2.5; or (b)
a is larger than or equal to the square root of the total area of the polar plate; or (b)
a·P/(w·d·cosθ)≥300。
Through theoretical research and a large number of practices, the relation among the structural parameters is obtained, and when the structural parameters accord with the relation, the flow velocity of the fluid in the fuel cell polar plate can reach a threshold value, so that the purpose of rapid drainage is realized.
In some embodiments, the specific steps of the preliminary design of the structural parameters are as follows:
setting a flow field period P0, a groove width w0 and a flow field depth d0 according to the balance of flow field forming process capability and manufacturing difficulty and the balance of flow field performance and manufacturing cost; illustratively, the flow field structural parameters of the cathode plate 100 and the anode plate 200 are designed identically, the flow field period p0=2.0, the groove width w0=1.0, and the flow field depth d0=0.5;
setting an included angle theta 0 between the flow field and the horizontal direction according to the interface design requirement of the flow field; illustratively, the angle θ0=0° of the flow field to the horizontal direction;
setting the length a0 of a flow field in an active area and the width b0 of the flow field in the active area according to the output power requirement of the fuel cell; illustratively, the flow field length a0=240 and the flow field width b0=100.
In some embodiments, the current density is proportional to the transferred charge and the reactant consumption per unit area according to faraday's law, and the flow of the fluid is determined by the following equation:
wherein Q is the flow rate of the fluid; lambda is the stoichiometric ratio of the oxidant or fuel; j is the current density of the fuel cell; c is the concentration of the oxidant or fuel; z is the compression factor of the gas; n is the number of moles of electron transport that occur when an electrochemical reaction occurs per mole of material; f is Faraday constant; v (V) m Is the molar volume of the gas.
According to the S2 preliminary plate design, the air flow at different current densities is calculated using the method described in S3, with λ=2, z=1, c=21%, as shown in table 1, and the hydrogen flow at different current densities is calculated using λ=1.5, z=1, c=1, as shown in table 1.
TABLE 1 flow at different current densities
In some embodiments, the area of fluid flow is calculated by the product of the cross-sectional area of the grooves and the number of grooves of the flow field, the fluid flow area being determined by the following equation:
wherein A is the flow area of the fluid.
Calculating the sectional area of a single flow channel by the product w.d of the groove width and the flow field depth of the flow field, and calculating the ratio of the flow field width to the flow field periodTo count the number of flow channels.
According to the initial plate design of S2, the fluid flow area a=25 is calculated using the method described in S4 2 。
In some embodiments, the flow rate of the fluid is calculated by the ratio of the flow rate to the fluid flow area, the flow rate of the fluid being determined by the following equation:
where v is the flow rate of the fluid.
Based on the air flow, hydrogen flow and the above formula at different current densities, the flow rate of the fluid was calculated, and the specific calculation results are shown in table 2.
TABLE 2 flow rates of fluids at different Current densities
And as for the calculation result of the method, the requirements that the air flow rate is more than or equal to 0.2m/s and the hydrogen flow rate is more than or equal to 0.1m/s are met, so that the flow field design parameters are reasonable, and the detailed design of the flow field structure can be carried out.
The utility model provides a structural design method of a fuel cell polar plate, which provides a method for structural design of the fuel cell polar plate by establishing a relation between structural parameters of the fuel cell and fluid flow velocity, and by the method, key structural parameters influencing the flow velocity in the fuel cell polar plate are proposed, and the structural parameters can be designed, namely the ratio of the length and the width of a flow field passing through an active area of the polar plate; or the ratio of the plate flow field period to the channel width of the gas flow channel; or the ratio of the polar plate flow field period to the flow channel depth is designed to change the flow velocity of fluid, the gas flow velocity of the flow field can be obviously improved without increasing the manufacturing difficulty and the cost of the bipolar plate, the drainage power is enhanced, the flooding of the battery is avoided, the mass transfer polarization of the battery is reduced, the performance of the battery is improved, the battery is enabled to adapt to the operation condition with low metering ratio, and the power density of the galvanic pile is improved.
As shown in fig. 2, the present utility model also discloses a fuel cell plate prepared by adopting the above fuel cell plate structure design method, which includes: a gas flow field 1, an oxidant inlet, an oxidant outlet, a coolant inlet, a coolant outlet, a fuel inlet and a cooling water flow field 2;
the gas flow field 1 is arranged at one side of the fuel cell polar plate;
the cooling water flow field 2 is arranged on the other side of the fuel cell polar plate;
the oxidant inlet, the coolant inlet and the fuel outlet are arranged at one end of the fuel cell polar plate in parallel;
the oxidant outlet, the coolant outlet and the fuel inlet are arranged at the other end of the fuel cell polar plate in parallel.
In some embodiments, the gas flow field 1 comprises a plurality of first protrusions 11 and a plurality of first grooves 12;
the first protrusion 11 and the first groove 12 are arranged at intervals;
the sum of the width of the first protrusion 11 and the width of the first groove 12 is a flow field period P;
the depth of the first groove 12 is d;
wherein P/d is more than or equal to 2.5.
A first protrusion 11 for supporting a fuel cell plate;
a first recess 12 for gas communication.
In some embodiments, the cooling water flow field 2 includes a plurality of second protrusions 21 and a plurality of second grooves 22;
the second protrusion 21 and the second groove 22 are arranged at intervals;
the sum of the width of the second protrusion 21 and the width of the second groove 22 is a flow field period P;
the depth of the second groove 22 is d;
wherein P/d is more than or equal to 2.5.
A second protrusion 21 for supporting a fuel cell plate;
and a second groove 22 for cooling water circulation.
The structural parameters of the gas flow field 1 and the cooling water flow field 2 can be the same or different.
In some embodiments, a/b is 1; or (b)
P/w is more than or equal to 1.8; or (b)
a is larger than or equal to the square root of the total area of the polar plate; or (b)
a·P/(w·d·cosθ)≥300。
The fuel cell plates are divided into a cathode plate 100 and an anode plate 200.
A cathode plate 100 for transporting air;
anode plate 200 for transporting hydrogen.
As shown in fig. 3, the cathode plate 100 includes: an air flow field 10, a first oxidant inlet 101, a first oxidant outlet 102, a first coolant inlet 103, a first coolant outlet 104, a first fuel outlet 105, a first fuel inlet 106, and a first cooling flow field 107; the air flow field 10 is comprised of a plurality of spaced grooves;
the air flow field 10 is arranged at one side of the cathode plate 100;
the first cooling flow field 107 is disposed on the other side of the cathode plate 100;
the first oxidant inlet 101, the first coolant inlet 103 and the first fuel outlet 105 (which are sequentially arranged from top to bottom) are arranged at one end of the cathode plate 100 in parallel;
the first oxidant outlet 102, the first coolant outlet 104, and the first fuel inlet 106 (which are arranged in order from bottom to top) are disposed in parallel at the other end of the cathode plate 100.
An air flow field 10 for air circulation;
a first oxidant inlet 101 for air flow into the fuel cell plates;
a first oxidant outlet 102 for air flowing out of the fuel cell plate;
a first coolant inlet 103 for cooling water to flow into the fuel cell plates;
a first coolant outlet 104 for cooling water to flow out of the fuel cell plates;
a first fuel outlet 105 for hydrogen gas to flow out of the fuel cell plate;
a first fuel inlet 106 for hydrogen gas to flow into the fuel cell plate;
a first cooling flow field 107 for cooling water to circulate within the fuel cell plates.
As shown in fig. 4, the anode plate 200 includes: a hydrogen flow field 20, a second oxidant inlet 201, a second oxidant outlet 202, a second coolant inlet 203, a second coolant outlet 204, a second fuel outlet 205, a second fuel inlet 206, and a second cooling flow field 207; the hydrogen flow field 20 is comprised of a plurality of spaced grooves;
the hydrogen flow field 20 and the second cooling flow field 207 are respectively arranged at two sides of the anode plate 200;
the second oxidant inlet 201, the second coolant inlet 203 and the second fuel outlet 205 (which are sequentially arranged from bottom to top) are arranged at one end of the anode plate 200 in parallel;
a second oxidant outlet 202, a second coolant outlet 204, and a second fuel inlet 206 (arranged in order from top to bottom) are disposed in parallel at the other end of the anode plate 200.
A hydrogen flow field 20 for hydrogen flow;
a second oxidant inlet 201 for air flow into the fuel cell plates;
a second oxidant outlet 202 for air flowing out of the fuel cell plate;
a second coolant inlet 203 for cooling water to flow into the fuel cell plates;
a second coolant outlet 204 for cooling water to flow out of the fuel cell plates;
a second fuel outlet 205 for hydrogen gas to flow out of the fuel cell plate;
a second fuel inlet 206 for hydrogen gas to flow into the fuel cell plate;
a second cooling flow field 207 for cooling water to circulate within the fuel cell plates.
In some embodiments, cathode plate 100 and anode plate 200 are stamped from stainless steel or titanium alloy sheet metal, which has the advantages of high electrical conductivity, corrosion resistance, ease of tooling, and the like. The cathode plate 100 and the anode plate 200 may also be made of conductive materials such as graphite.
In some embodiments, the first cooling flow field 107 of the cathode plate 100 and the second cooling flow field 207 of the anode plate 200 are combined in opposition to form a cooling flow field 400.
As shown in fig. 5, the present utility model also discloses a fuel cell including the above-mentioned cathode plate 100, anode plate 200 and membrane electrode assembly 300;
the cathode plate 100, the anode plate 200, the membrane electrode assembly 300, the cathode plate 100 and the anode plate 200 are arranged in sequence;
specifically, the first cooling flow field 107 side of the cathode plate 100 is abutted against the second cooling flow field 207 of the anode plate 200 (the first oxidant inlet 101 is correspondingly communicated with the second oxidant inlet 201, the first oxidant outlet 102 is correspondingly communicated with the second oxidant outlet 202, and other inlets and outlets of the coolant and the fuel are correspondingly communicated, which will not be described further), the hydrogen flow field 20 side of the anode plate 200 is abutted against the anode side 302 of the membrane electrode assembly 300, the cathode side 301 of the membrane electrode assembly 300 is abutted against the air flow field 10 side of the cathode plate 100, and the first cooling flow field 107 side of the cathode plate 100 is abutted against the second cooling flow field 207 of the anode plate 200.
If the fuel cell plate adopts a stamping forming mode, the design method determines the structure of the cooling flow field 400 of the plate;
a fuel cell is formed by stacking the fuel cell plates on both sides of the membrane electrode assembly 300, wherein the cathode plate 100 is disposed on the cathode side 301 of the membrane electrode assembly 300, and the anode plate 200 is disposed on the anode side 302 of the membrane electrode assembly 300.
Based on the above-described fuel cell plate structure design method, fuel cell plates were prepared, and fuel cell examples were prepared, and fuel cell comparative examples were also prepared, with specific data shown in table 3.
Table 3 parameters of plate structures of examples and comparative examples
Other structural parameters are respectively the same: flow field length a=240, flow field width b=100, p/w=2, flow field angle θ=0° to horizontal;
as shown in fig. 6, for comparing the air flow rates of the fuel cells of the embodiment and the comparative example, λ=2 and z=1 are taken, and by adopting the step S5, the air flow rates of the embodiment and the comparative example in the fuel cells are calculated, and the flow rate of P/d=4 is greater than the flow rate of P/d=2.4, so that as the sum P of the width of the protrusions and the width of the grooves is increased or the depth d of the grooves is reduced, the flow rate in the flow field is obviously improved, and therefore, the liquid water in the flow field can be rapidly discharged out of the cell by the air flow, and the flooding phenomenon of the cell is avoided; moreover, the increase of the sum P of the width of the bulge and the width of the groove or the decrease of the depth d of the groove can greatly reduce the manufacturing difficulty and cost of the polar plate, and particularly for the polar plate formed by stamping a metal sheet, the stamping difficulty is obviously reduced along with the increase of the width-to-depth ratio of the stamping. The performance of the fuel cell is compared in combination with the two designs.
As shown in fig. 7, in the example, as the flow rate in the flow field increases, the liquid water in the flow field is rapidly discharged, and the mass transfer polarization in the stack decreases, so that the performance of the stack in the high-density region of the example is significantly higher than that of the comparative example;
in the comparison design scheme, the design scheme with the P/d more than or equal to 2.5 is selected, namely the embodiment, and the structural parameters of P/d=4 are better, so that on one hand, compared with the design scheme with the P/d=2.4 of the comparison example, the embodiment can obviously increase the flow speed, improve the drainage capacity and reduce the mass transfer polarization of a high-electric-density region; on the other hand, compared with the design scheme of the comparative example P/d=2.4, the manufacturing difficulty and cost of the polar plate can be greatly reduced.
According to the fuel cell pole plate and the fuel cell thereof, more comprehensive design parameters are extracted, the relation between the fluid flow velocity and the structural parameters of the fuel cell pole plate is established, the restriction relation of each parameter is comprehensively balanced, the logic of the pole plate structural design is cleared, the primary and secondary are cleared, and the design development of the pole plate and the comparison and optimization of different design schemes are guided; the flow channel structural parameters are designed to improve the flow velocity of fluid in the polar plate flow field, so that on one hand, the manufacturing difficulty and cost of the bipolar plate can be reduced, on the other hand, the flow velocity of fluid in the flow channel is increased, the drainage capacity is improved, the performance and specific power of the fuel cell are improved, and the fuel cell stack is adapted to operate under the working condition of low metering ratio.
Although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present utility model.
Claims (7)
1. A fuel cell plate, comprising: a gas flow field (1), an oxidant inlet, an oxidant outlet, a coolant inlet, a coolant outlet, a fuel inlet and a cooling water flow field (2);
the gas flow field (1) is arranged at one side of the fuel cell polar plate;
the cooling water flow field (2) is arranged on the other side of the fuel cell polar plate;
the oxidant inlet, the coolant inlet and the fuel outlet are arranged at one end of the fuel cell polar plate in parallel;
the oxidant outlet, the coolant outlet and the fuel inlet are arranged at the other end of the fuel cell polar plate in parallel;
the gas flow field (1) comprises a plurality of first protrusions (11) and a plurality of first grooves (12);
the first bulge (11) and the first groove (12) are arranged at intervals;
the sum of the width of the first protrusion (11) and the width of the first groove (12) is the flow field period；
The depth of the first groove (12) is；
Wherein,；
the cooling water flow field (2) comprises a plurality of second protrusions (21) and a plurality of second grooves (22);
the second bulge (21) and the second groove (22) are arranged at intervals;
the sum of the width of the second protrusion (21) and the width of the second groove (22) is the flow field period；
The depth of the second groove (22) is；
Wherein,。
2. the fuel cell plate of claim 1, wherein the structural parameters of the fuel cell plate include: included angle between flow field and horizontal directionLength of flow field->Flow field width->Flow field period->Groove width->And depth of flow field。
3. The fuel cell plate of claim 2 wherein,
。
4. the fuel cell plate of claim 2 wherein,
。
5. the fuel cell plate of claim 2 wherein,
and the square root of the total area of the polar plate is not less than.
6. The fuel cell plate of claim 2 wherein,
。
7. a fuel cell characterized by being formed by stacking the fuel cell electrode plates according to any one of claims 1 to 6 on both sides of a membrane electrode assembly (300).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321492019.3U CN220753484U (en) | 2023-06-12 | 2023-06-12 | Fuel cell electrode plate and fuel cell thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321492019.3U CN220753484U (en) | 2023-06-12 | 2023-06-12 | Fuel cell electrode plate and fuel cell thereof |
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| Publication Number | Publication Date |
|---|---|
| CN220753484U true CN220753484U (en) | 2024-04-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321492019.3U Active CN220753484U (en) | 2023-06-12 | 2023-06-12 | Fuel cell electrode plate and fuel cell thereof |
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| Country | Link |
|---|---|
| CN (1) | CN220753484U (en) |
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2023
- 2023-06-12 CN CN202321492019.3U patent/CN220753484U/en active Active
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