Phase shift sine function wave type fuel cell flow field structure

Abstract

The utility model discloses a phase shift sine function wave type fuel cell flow field structure which comprises a polar plate, a flow channel ridge and a fluid channel, a plurality of flow channel ridges are arranged, the flow channel ridges are distributed on the polar plate, and the fluid channels are formed between the adjacent flow channel ridges; the flow section of the fluid channel changes periodically, and the fluid channel is used for changing the flow velocity change of the reaction gas of the fuel cell. The fluid channel of the battery flow field structure provided by the utility model is provided with the circulating cross section which is periodically changed, so that the flow speed and pressure of fluid at each position point in the fluid channel can be changed, and a rough surface can be formed in the fluid channel to generate turbulent flow to promote the mixing of consumption layer gas and accumulation layer gas; therefore, a reaction medium can be transferred more effectively, generated water can be discharged more effectively, and the method has the advantages of improving the pile performance, improving the reaction efficiency, prolonging the service life of the pile and the like.

Description

Technical Field

[0001] The utility model relates to the field of fuel cells, in particular to a phase-shifted sinusoidal function wave-type fuel cell flow field structure. Background Art

[0002] A fuel cell is a chemical device that converts the chemical energy of a fuel directly into electrical energy. It is also called an electrochemical generator. It is the fourth power generation technology after hydroelectric power generation, thermal power generation, and atomic power generation. Since fuel cells convert part of the Gibbs free energy in the chemical energy of the fuel into electrical energy through electrochemical reactions, they are not limited by the Carnot cycle effect and therefore have high efficiency. In addition, fuel cells use fuel and oxygen as raw materials and have no mechanical transmission parts, so they emit very little harmful gas and have a long service life.

[0003] Theoretically, fuel cells can operate at a thermal efficiency close to 100%, which is very economical. Due to the limitations of various technical factors, the total conversion efficiency of various fuel cells currently in operation is mostly in the range of 45% to 60%, and can reach more than 80% if the heat exhaust utilization is considered. In addition, fuel cell devices contain no or very few moving parts, are reliable, require less maintenance, and are quieter than traditional generator sets. In addition, the isothermal electrochemical method directly converts chemical energy into electrical energy without going through the thermal engine process, and is not restricted by the Carnot cycle. Therefore, the energy conversion efficiency is high, the reaction is clean and complete, and few harmful substances are produced. It is becoming an ideal way of energy utilization. At the same time, with the continuous maturity of fuel cell technology and the provision of sufficient natural gas sources by the West-East Gas Transmission Project, all of this makes fuel cells regarded as a very promising energy power device, and the commercial application of fuel cells has broad development prospects.

[0004] At present, the flow channel structure of fuel cells is mostly a linear structure, the gas flow rate is relatively stable, and there is no obvious gas flow rate change rate. The water generated by the fuel cell cannot be discharged effectively and quickly, which also affects the efficiency of the fuel cell and has certain defects. Utility Model Content

[0005] The utility model aims to provide a phase-shifted sinusoidal function wave-type fuel cell flow field structure to change the change of fuel cell gas flow rate, thereby improving the conversion efficiency of the fuel cell.

[0006] In order to solve the above technical problems, the utility model provides a phase-shifted sinusoidal function wave-type fuel cell flow field structure, including a polar plate, a flow channel ridge and a fluid channel;

[0007] There are a plurality of flow channel ridges, and the flow channel ridges are distributed on the electrode plate, and the fluid channels are formed between adjacent flow channel ridges;

[0008] The flow cross section of the fluid channel changes periodically, and the fluid channel is used to change the flow rate of the fuel cell reaction gas.

[0009] Furthermore, the flow channel ridge is configured to be wavy, and a plurality of the flow channel ridges are evenly distributed on the electrode plate.

[0010] Furthermore, the flow channel ridge is a sinusoidal function waveform.

[0011] Furthermore, there is a tangent point between two adjacent flow channel ridges.

[0012] Furthermore, the phase difference between the sinusoidal function waveforms of two adjacent groups of the flow channel ridges is 180°.

[0013] Furthermore, the number of the flow channel ridges in each group is at least 1, and the sinusoidal function waveforms of the flow channel ridges in the same group are in phase.

[0014] Furthermore, the fluid channel intervals have contraction arcs in the vertical direction at the crests and / or troughs of the sine function.

[0015] Furthermore, the arc height of the contraction arc is smaller than the depth of the fluid channel.

[0016] Furthermore, the arc height of the contraction arc is less than four fifths of the depth of the fluid channel.

[0017] Compared with the prior art, the utility model has at least the following beneficial effects:

[0018] The fluid channel of the battery flow field structure of the utility model has a periodically changing flow cross-section, which can change the fluid flow rate and pressure at each position point in the fluid channel, and can form a rough surface inside the fluid channel to generate turbulence to promote the mixing of the depleted layer gas and the enriched layer gas, thereby more effectively transferring the reaction medium and more effectively discharging the generated water, which has the advantages of improving the performance of the battery stack, improving the reaction efficiency, and extending the life of the battery stack. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the phase-shifted sinusoidal function wave fuel cell flow field structure of the utility model;

[0020] Figure 2 It is a structural schematic diagram of the phase-shifted sine function wave-type fuel cell flow field structure of the utility model when the number of flow channel ridges is 2;

[0021] Figure 3 It is a schematic diagram of the contraction arc cross-section structure of the phase-shifted sine function wave-type fuel cell flow field structure of the utility model. DETAILED DESCRIPTION

[0022] The phase-shifted sinusoidal function wave fuel cell flow field structure of the present invention will be described in more detail below in conjunction with a schematic diagram, wherein a preferred embodiment of the present invention is shown. It should be understood that those skilled in the art can modify the present invention described herein while still achieving the beneficial effects of the present invention. Therefore, the following description should be understood as being widely known to those skilled in the art, and not as a limitation to the present invention.

[0023] The present invention is described in more detail in the following paragraphs by way of example with reference to the accompanying drawings. The advantages and features of the present invention will become more apparent from the following description. It should be noted that the accompanying drawings are in very simplified form and in non-precise proportions, and are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention.

[0024] like Figure 1 As shown, the embodiment of the utility model proposes a phase-shifted sinusoidal function wave-type fuel cell flow field structure, including a polar plate 1, a flow channel ridge 2 and a fluid channel 3.

[0025] Specifically, a plurality of flow channel ridges 2 are provided, and the flow channel ridges 2 are distributed on the electrode plate 1 , and the fluid channels 3 are formed between adjacent flow channel ridges 2 .

[0026] The flow cross section of the fluid channel 3 changes periodically, and the fluid channel 3 is used to change the flow rate of the fuel cell reaction gas.

[0027] Fuel cells convert fuels such as hydrogen into electricity through a chemical reaction with an oxidant such as oxygen, while producing water and heat. The design of the fuel cell allows it to convert energy directly without the need for combustion, which improves energy conversion efficiency and reduces polluting emissions.

[0028] The flow field structure of a fuel cell is a key part of its design. It directly affects the distribution of the reaction gas, water management, and thermal management, which in turn affects the performance and life of the battery. Common flow field designs include straight flow channels, serpentine flow channels, and AC-DC flow channels. These designs have their own advantages and disadvantages. For example, a serpentine flow field helps improve the uniformity of gas distribution, but may result in a higher pressure drop.

[0029] In this embodiment, the flow cross section of the fluid channel 3 changes periodically. During the flow of fuel cell gas, when the fuel cell gas passes through a narrow area of ​​the fluid channel 3, the flow rate of the fuel cell gas increases and the pressure increases; and when the fuel gas passes through a wider area of ​​the fluid channel 3, the flow rate of the fuel cell gas slows down and the pressure decreases. During the operation of the fuel cell, the flow rate and pressure of the fuel cell gas change continuously, and a rough surface can be formed inside the flow channel to generate turbulence to promote the mixing of the consumption layer gas and the enrichment layer gas, more effectively transfer the reaction medium and more effectively discharge the generated water, thereby improving the conversion efficiency of the fuel cell.

[0030] Furthermore, the flow channel ridge 2 is configured to be wavy, and a plurality of the flow channel ridges 2 are evenly distributed on the electrode plate 1 .

[0031] Specifically, the flow channel ridges 2 are sinusoidal function waveforms, two adjacent flow channel ridges 2 have a tangent point, and the phase difference between the sinusoidal function waveforms of two adjacent groups of flow channel ridges 2 is 180°.

[0032] In this embodiment, when two adjacent flow channel ridges 2 are respectively at the crest and the trough, and the two adjacent flow channel ridges 2 do not intersect at the tangent point, the width of the fluid channel 3 here is the largest, and the width of the fluid channel 3 gradually decreases as it expands to both sides, thereby forming a fluid channel 3 with a changing flow cross-section.

[0033] In a specific embodiment, the number of the flow channel ridges 2 in each group is at least 1, and the sinusoidal function waveforms of the flow channel ridges 2 in the same group are in phase. Figure 2 shown).

[0034] Furthermore, the fluid channel 3 has contraction arcs 4 in the vertical direction at intervals at the peaks and / or troughs of the sine function.

[0035] Specifically, the arc height of the contraction arc 4 is smaller than the depth of the fluid channel 3 , and the arc height of the contraction arc 4 is smaller than four fifths of the depth of the fluid channel 3 .

[0036] In this embodiment, if Figure 3 As shown, the arc height H of the contraction arc 4 is less than four-fifths of the depth D of the fluid channel 3, so that the channel ridge 2 has a certain thickness and can stably withstand the gas pressure and gas impact of the fuel cell, thereby improving the stability of the fuel cell flow field structure.

[0037] Compared with the prior art, the utility model has at least the following beneficial effects:

[0038] The fluid channel of the battery flow field structure of the utility model has a periodically changing flow cross-section, which can change the fluid flow rate and pressure at each position point in the fluid channel, and can form a rough surface inside the fluid channel to generate turbulence to promote the mixing of the depleted layer gas and the enriched layer gas, thereby more effectively transferring the reaction medium and more effectively discharging the generated water, which has the advantages of improving the performance of the battery stack, improving the reaction efficiency, and extending the life of the battery stack.

[0039] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A phase-shifted sinusoidal function wave fuel cell flow field structure, characterized in that: including a plate, a flow channel ridge, and a fluid channel; There are a plurality of flow channel ridges, and the flow channel ridges are distributed on the electrode plate, and the fluid channels are formed between adjacent flow channel ridges; The flow cross section of the fluid channel changes periodically, and the fluid channel is used to change the flow rate of the fuel cell reaction gas.

2. The phase-shifted sinusoidal function wave fuel cell flow field structure according to claim 1, characterized in that: The flow channel ridges are arranged in a wave shape, and a plurality of the flow channel ridges are evenly distributed on the electrode plate.

3. The phase-shifted sinusoidal function wave fuel cell flow field structure according to claim 2, characterized in that: The flow channel ridge is a sinusoidal function waveform.

4. The phase-shifted sinusoidal function wave fuel cell flow field structure according to claim 3, characterized in that: Two adjacent flow channel ridges have a tangency point therebetween.

5. The phase-shifted sinusoidal function wave fuel cell flow field structure as claimed in claim 3, characterized in that: The phase difference between the sinusoidal function waveforms of two adjacent groups of flow channel ridges is 180°.

6. The phase-shifted sinusoidal function wave fuel cell flow field structure according to claim 5, characterized in that: The number of the flow channel ridges in each group is at least 1, and the sinusoidal function waveforms of the flow channel ridges in the same group are in phase.

7. The phase-shifted sinusoidal function wave fuel cell flow field structure according to claim 3, characterized in that: The fluid channel intervals have contraction arcs in the vertical direction at the crests and / or troughs of the sine function.

8. The phase-shifted sinusoidal function wave fuel cell flow field structure according to claim 7, characterized in that: The arc height of the contraction arc is smaller than the depth of the fluid channel.

9. The phase-shifted sinusoidal function wave fuel cell flow field structure according to claim 8, characterized in that: The arc height of the contraction arc is less than four fifths of the depth of the fluid channel.

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