The entire contents of Taiwan Patent Application No. 103102327, filed on Jan. 22, 2014, from which this application claims priority, are incorporated herein by reference.
1. Field of the Invention
The present invention generally relates to a fuel cell and more particularly to a fuel cell for improving flow field uniformity and reducing gas pressure loss.
2. Description of Related Art
In recent years, as the energy shortage is growing and the environmental issues become more prominent, the fuel cell is widely expected as an environmentally friendly energy, which converts the chemical energy from a fuel (such as hydrogen) into electricity through a chemical reaction with oxygen or another oxidizing agent to produce electricity, so as to provide low-pollution energy.
A need has thus arisen to propose a novel fuel cell to overcome deficiencies of the conventional fuel cells.
In view of the foregoing, it is an object of the embodiment of the present invention to provide a fuel cell for improving flow field uniformity and reducing gas pressure loss. The fuel cell with a configuration design of the baffle plate and perforated plate significantly improves the gas pressure loss and causes the input gas to uniformly flow into the fuel cell stack for enhancing the overall efficiency.
According to one embodiment, a fuel cell for improving flow field uniformity and reducing gas pressure loss includes a fuel cell stack and a gas input unit. The gas input unit has a gas input passage, an input port, an input baffle plate and at least one perforated plate. An end of the gas input passage is connected to an end of the fuel cell stack. The input port is disposed on another end of the gas input passage. The input baffle plate is disposed in the gas input passage and located in front of the input port, and a gap exists between the input baffle plate and the input port. The perforated plate is disposed between the input baffle plate and the fuel cell stack.
According to another embodiment, a fuel cell for improving flow field uniformity and reducing gas pressure loss includes a fuel cell stack, a gas input unit and a gas output unit. The gas input unit has a gas input passage, an input port, an input baffle plate and at least one perforated plate. An end of the gas input passage is connected to an end of the fuel cell stack. The input port is disposed on another end of the gas input passage. The input baffle plate is disposed in the gas input passage and located in front of the input port, and a gap exists between the input baffle plate and input port. The perforated plate is disposed between the input baffle plate and fuel cell stack. The gas output unit has a gas output passage, an output port and an output baffle plate. An end of the gas output passage is connected to another end of the fuel cell stack. The output port is disposed on another end of the gas output passage. The output baffle plate is disposed in the gas output passage and located in front of the output port, and a gap exists between the output baffle plate and the output port.
The detailed description of the present invention will be discussed in the following embodiments, which are not intended to limit the scope of the present invention, but can be adapted for other applications. While drawings are illustrated in details, it is appreciated that the quantity of the disclosed components may be greater or less than that disclosed, except expressly restricting the amount of the components.
Referring to
More particularly, referring to FIG. 3A/3B,
Moreover, the perforated plate 228 has a plurality of holes 229. Thus, when the separated flows of the input gas is introduced through the perforated plate 228, the holes 229 may generate a stable gas flow with a uniform flow distribution to diffuse into the fuel cell stack 210. Furthermore, as shown in FIG. 3A/3B, the shape of the perforated plate 228 substantially complements the shape of the input baffle plate 226, in order to approximately cove the cross-section of the gas input passage 222. Therefore, the perforated plate 228 may significantly improve the flow field uniformity of the separated flows of the input gas, which is caused by the input baffle plate 226. In this embodiment, the perforated plate 228 has a rectangular shape. However, the present invention is not limited thereto, as the shape of the perforated plate 228 may be appropriately adjusted according to the needs of the actual design or the practical shapes of the input baffle plate 226 and the gas input passage 222, so as to gain the optimal gas flow distribution. Simultaneously, the gap between the perforated plate 228 and the input baffle plate 226, the size of the aperture diameter of the holes 229 and the distribution density of the holes 229 may be adjusted according to the practical needs of the desired overall gas flow distribution.
Referring to
Referring to
Accordingly, when the output gas from the fuel cell stack 310 flows through the gas output passage 332 to the output port 334, as the output baffle plate 336 shields the output port 334 to reduce the practical aperture diameter, and the output baffle plate 336 also cause the output gas to be separated to flow towards two sides of the gas output passage 332, the gas pressure of the gas output unit 330 can be greatly increased, so as to compensate the inner pressure loss of the fuel cell 300. Moreover, as the structure of the gas input unit 320 is so similar to the one in the embodiment mentioned above that the similarities are not repeated here.
Although specific embodiments have been illustrated and described, it will be appreciated by those skilled in the art that various modifications may be made without departing from the scope of the present invention, which is intended to be limited solely by the appended claims.
Number | Date | Country | Kind |
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103102327 | Jan 2014 | TW | national |