TW202109956A - A gas pressure reducing device, a fuel cell system and an electric vehicle - Google Patents

Abstract

The invention discloses a gas pressure reducing device, a fuel cell system including the gas pressure reducing device, and an electric vehicle including the fuel cell system. The gas pressure reduction device includes a pneumatic power generation module including a power generator and a pneumatic rotating assembly. The pneumatic rotating assembly has a gas inlet port and a gas discharge port. The pneumatic rotating assembly includes a rotating shaft for connection to the power generator. The rotating shaft will be driven to rotate when the reaction gas supplied by the gas supply device enters the pneumatic rotating assembly through the gas inlet port. The power generator can be driven by the rotating shaft to generate electric energy. The reaction gas with lower pressure discharged through the power generator will into the fuel cell. The high-pressure reaction gas supplied by the gas supply device, after passing through the generator, the pressure of the gas will be reduced to meet the pressure required by the fuel cell, and at the same time the generator can generate electric energy.

Description

Gas pressure reduction device, fuel cell system and electric vehicle

The invention relates to a gas pressure reducing device, in particular to a gas pressure reducing device applied to a fuel cell system.

Most of the existing electric vehicles that use fuel cells are equipped with high-pressure gas cylinders, and the high-pressure gas cylinders store hydrogen required by the fuel cell. Because the high-pressure gas cylinder stores high-pressure hydrogen, the hydrogen discharged from the high-pressure gas cylinder must first pass through a gas pressure reduction device to reduce the pressure of the hydrogen gas, and then the hydrogen gas whose pressure is reduced by the gas pressure reduction device can be sent Into the fuel cell for chemical reactions. However, when reducing the pressure of the gas, a lot of energy will be wasted.

The invention discloses a gas pressure reducing device, a fuel cell system and an electric vehicle, which are mainly used to improve the existing fuel cell, and in the process of reducing high-pressure reaction gas, many energy problems are wasted.

One of the embodiments of the present invention discloses a gas pressure reducing device, which is used to connect a gas supply device and a fuel cell. The gas pressure reducing device is used to reduce the gas pressure of the reaction gas provided by the gas supply device to make the reaction gas The gas pressure is first reduced to a predetermined pressure value before entering the fuel cell. The gas pressure reduction device includes: a pneumatic power generation module. The pneumatic power generation module includes a generator and a pneumatic rotating component. The pneumatic rotating assembly has a gas inlet and a gas outlet. The gas inlet is used to connect to gas supply equipment, and the gas outlet is used to connect to a reaction gas inlet of the fuel cell; the pneumatic rotating assembly includes a rotating shaft, a rotating shaft and The generator is connected. Wherein, when the reaction gas provided by the gas supply device enters the pneumatic rotating assembly through the gas inlet and drives the rotating shaft to rotate, the generator will be driven by the rotating shaft to correspondingly generate electric energy.

One embodiment of the present invention discloses a fuel cell system for connecting with a gas supply device for providing a reaction gas. The fuel cell system includes: at least one fuel cell and a gas pressure reducing device. The fuel cell includes a first reaction gas inlet, a second reaction gas inlet, and a reaction product outlet. The reaction gas entering the fuel cell from the first reaction gas inlet and the second reaction gas, respectively, can carry out chemical reactions in the fuel cell , Thereby generating a reaction product and a first electric energy, the reaction product can be discharged through the reaction product outlet. The gas pressure reducing device is connected to the gas supply device and the first reaction gas inlet, and the gas pressure reducing device is used to reduce the gas pressure of the reaction gas provided by the gas supply device to a predetermined pressure value before entering the fuel cell. The gas pressure reducing device includes: a pneumatic power generation module. The pneumatic power generation module includes a generator and a pneumatic rotating component. The pneumatic rotating assembly has a gas inlet and a gas outlet. The gas inlet is used to connect to gas supply equipment, and the gas outlet is used to connect to a reaction gas inlet of the fuel cell; the pneumatic rotating assembly includes a rotating shaft, a rotating shaft and The generator is connected. Wherein, when the reaction gas provided by the gas supply device enters the pneumatic rotating assembly through the gas inlet and drives the rotating shaft to rotate, the generator will be driven by the rotating shaft to correspondingly generate a second electric energy.

One embodiment of the present invention discloses an electric vehicle, which includes: at least one high-pressure gas cylinder, a fuel cell system, and an electric storage unit. The inside of the high-pressure gas cylinder is used to store high-pressure reaction gas. The fuel cell system includes: at least one fuel cell and a gas pressure reducing device. The fuel cell includes two reaction gas inlets and a reaction product discharge outlet. The reaction gas entering the fuel cell through the two reaction gas inlets can undergo chemical reactions in the fuel cell to produce a reaction product and a first electric energy. The reaction product can be discharged through the reaction product discharge port. The gas pressure reduction device is used to reduce the gas pressure of the reaction gas provided by the high-pressure gas cylinder to a predetermined pressure value, so that the reaction gas with the predetermined pressure value enters the fuel cell. The gas pressure reduction device includes: a pneumatic power generation module . The pneumatic power generation module includes a generator and a pneumatic rotating component. The pneumatic rotating assembly has a gas inlet and a gas outlet. The gas inlet is used to connect a high-pressure gas cylinder, and the gas outlet is used to connect to one of the reaction gas inlets of the fuel cell; the pneumatic rotating assembly includes a rotating shaft and a rotating shaft. Connect to the generator. Wherein, when the reaction gas provided by the high-pressure gas cylinder enters the pneumatic rotating assembly through the gas inlet and drives the rotating shaft to rotate, the generator will be driven by the rotating shaft to correspondingly generate a second electric energy. The power storage unit is used to store the first electrical energy and the second electrical energy generated by the fuel cell system, and the power storage unit is used as the power source required for the operation of the electric vehicle.

In summary, the gas pressure reduction device, fuel cell system and electric vehicle of the present invention will generate additional electric energy during the process of reducing the high-pressure reaction gas to the low pressure required by the fuel cell, which can improve the traditional In the fuel cell system, there is a problem of energy waste in the process of reducing the pressure of the reactant gas.

In order to further understand the features and technical content of the present invention, please refer to the following detailed descriptions and drawings about the present invention, but these descriptions and drawings are only used to illustrate the present invention, and do not make any claims about the protection scope of the present invention. limit.

In the following description, if it is pointed out, please refer to the specific drawing or as shown in the specific drawing, it is only used to emphasize that in the subsequent description, most of the related content appears in the specific drawing. However, it is not limited that only the specific drawings can be referred to in this subsequent description.

Please refer to FIG. 1, which is a block diagram of the gas pressure reducing device of the present invention. As shown in the figure, the gas pressure reduction device 1 is used to connect a fuel cell B1 and a gas supply device C, and the gas pressure reduction device 1 is used to reduce the gas pressure of the reaction gas provided by the gas supply device C so as to meet a predetermined The reaction gas of the pressure value enters the fuel cell B1. The gas supply device C referred to here may be determined according to the actual application scenario of the gas pressure reduction device 1. For example, when the gas pressure reduction device 1 is applied to an electric vehicle using a fuel cell, the gas supply device C can be a high-pressure gas cylinder; when the gas pressure reduction device is used in a fuel cell charging station, the gas supply device C can be a machine that can continuously supply gas.

The pneumatic power generation module 10 includes a generator 11 and a pneumatic rotating component 12. The pneumatic rotating assembly 12 has a gas inlet 121A and a gas outlet 121B. The gas inlet 121A is used to connect to the gas supply device C, and the gas outlet 121B is used to connect to a reaction gas inlet B11 of the fuel cell B1. The pneumatic rotating assembly 12 includes a rotating shaft 123 (as shown in FIG. 2 ), and the rotating shaft 123 is connected to the generator 11. In practical applications, the gas inlet 121A of the pneumatic rotary assembly 12 can be connected to the gas supply device C through at least one tube (not shown), and the gas outlet 121B of the pneumatic rotary assembly 12 can also be connected through at least one The tube body is connected to the reaction gas inlet B11 of the fuel cell B1.

When the reaction gas provided by the gas supply device C enters the pneumatic rotating assembly 12 through the gas inlet 121A and drives the rotating shaft 123 to rotate, the generator 11 will be driven by the rotating shaft 123 to correspondingly generate electric energy. In practical applications, the form, size, etc. of the generator 11 can be changed according to demand. Any generator that can be driven by a rotating shaft to generate electrical energy belongs to the specific implementable range of the generator 11 described in this embodiment. in.

When the reaction gas provided by the gas supply device C enters the pneumatic rotating assembly 12 through the gas inlet 121A, and the rotating shaft 123 is driven to rotate, the gas pressure of the reaction gas will be reduced to a predetermined pressure value, which meets the predetermined pressure value. The reaction gas can correspondingly be discharged outward through the gas discharge port 121B of the pneumatic rotary assembly 12. That is to say, the gas pressure of the reaction gas discharged from the gas outlet 121B of the pneumatic rotary assembly 12 basically meets the predetermined pressure value, and the predetermined pressure value is lower than the pressure of the reaction gas entering the pneumatic rotary assembly 12 through the gas inlet 121A. value.

Please refer to FIGS. 2 to 4 together. FIG. 2 shows a perspective view of one embodiment of the pneumatic rotating assembly of the gas pressure reducing device of the present invention, and FIG. 3 shows the pneumatic rotating assembly of the gas pressure reducing device of the present invention. A schematic front view of one of the embodiments. FIG. 4 shows a schematic side view of one of the embodiments of the pneumatic power generation module of the gas pressure reducing device of the present invention.

The pneumatic rotating assembly 12 may include a housing 121, a plurality of rotating sheets 122 and a rotating shaft 123. The housing 121 has a gas inlet 121A and a gas outlet 121B, and the housing 121 has an accommodating space SP inside. The plurality of rotating sheets 122 are fixed to each other at intervals, and the plurality of rotating sheets 122 are disposed in the housing 121 and correspondingly located in the accommodating space SP. In practical applications, each rotating sheet 122 may be a round sheet with a smooth surface, but it is not limited to this. Regarding the number of gas inlets 121A and their setting positions, they can be changed according to requirements. The figure shown is only one of the exemplary modes, but in order to make the pneumatic rotating assembly 12 have better rotation efficiency, the rotating plate 122 is In the disk-shaped embodiment, the gas inlet 121A may be substantially arranged in the tangential direction of the rotating sheet body 122. The location of the gas outlet 121B can also be changed according to demand, and is not limited to what is shown in the figure.

A part of the rotating shaft 123 is located in the accommodating space SP, and the rotating shaft 123 and the plurality of rotating pieces 122 are fixed to each other. A part of the rotating shaft 123 is exposed outside the housing 121. A part of the rotating shaft 123 exposed from the housing 121 is used to connect with the generator 11; in practical applications, the rotating shaft 123 exposed outside the housing 121 can be passed through various couplings 13 (as shown in Figure 4). (Shown) and other components are connected to the rotating shaft 111 of the generator 11.

When the reaction gas enters the accommodating space SP through the gas inlet 121A, the reaction gas will flow into the gap L between the two adjacent rotating sheets 122 (as shown in FIG. 4), based on the boundary layer effect (boundary layer effect). effect), the multiple rotating sheets 122 will rotate relative to the housing 121. When the rotating piece 122 rotates relative to the housing 121, the rotating shaft 123 connected to the plurality of rotating pieces 122 will be driven to rotate relative to the housing 121 together. When the rotating shaft 123 rotates with the plurality of rotating pieces 122, the rotating shaft 123 will drive the rotating shaft 111 of the generator 11 to rotate, so that the generator 11 generates electric energy.

Of course, in practical applications, the shell 121 corresponds to the position where the rotating shaft 123 is exposed is provided with related components such as ball bearings, so that when the multiple rotating pieces 122 rotate, the rotating shaft 123 can smoothly be relative to the shell 121 rotation. In particular, the gap L between the two adjacent rotating plates 122, the number of rotating plates 122 and their appearance can all be changed according to requirements, as long as the high-pressure gas flows into the two adjacent rotating plates In the gap L between the bodies 122, and the two rotating sheets 122 can be rotated by the boundary layer effect, they all fall within the practical implementation range of this embodiment.

In particular, in the specific implementation, it can be achieved by changing the size of the rotating plate 122, the number of the rotating plate 122, the size of the gas outlet 121B, and the gap between the two adjacent rotating plates 122. The pressure value of the reaction gas discharged through the gas discharge port 121B is changed by means such as width, so that the pressure value of the reaction gas discharged from the gas discharge port 121B can meet the predetermined pressure value. Of course, in different applications, it can also be used to connect the gas outlet 121B with the reactant gas inlet B11 of the fuel cell B1 with a related air pressure regulating device to adjust the pressure sent to the fuel cell B1. The gas pressure of the reaction gas.

As mentioned above, after the high-pressure reaction gas discharged from the gas supply device C passes through the pneumatic power generation module 10 of the present invention, not only can the pressure of the reaction gas be reduced to a predetermined pressure, but in the process of reducing the pressure of the reaction gas, It can also generate additional electrical energy. As shown in Figure 1, that is to say, after the gas pressure reduction device 1 of the present invention is connected to the gas supply device C and the fuel cell B1, in addition to the fuel cell B1 that can generate the first electric energy E1, the gas pressure reduction device 1 will also generate additional The second electric energy E2.

Please refer to FIG. 5, which shows a block diagram of another embodiment of the gas pressure reduction device of the present invention. As shown in the figure, the biggest difference between this embodiment and the previous embodiment is that the gas pressure reducing device 1 may further include a control module 20 and a flow control module 30. The flow control module 30 may include a flow valve 31 and a detector 32. The flow valve 31 is connected to the gas inlet 121A; specifically, the gas inlet 121A and the gas supply device C may be connected through a pipe body, and the flow valve 31 may be arranged on the pipe body.

The detector 32 is connected to the gas outlet 121B; specifically, the gas outlet 121B can be connected to the reaction gas inlet B11 of the fuel cell B1 through a pipe body, and the detector 32 can be arranged on the pipe body . The detector 32 can be used to detect at least one of the gas pressure and the gas flow rate of the reaction gas discharged from the gas outlet 121B, but it is not limited to this. The detector 32 can also be used to detect the reaction according to requirements. The temperature of the gas, etc. In addition, the number of detectors 32 is not limited to a single one; in an embodiment where the number of detectors 32 is more than two, different detectors 32 may be used to detect different values of the reaction gas.

The control module 20 is electrically connected to the flow valve 31 and the detector 32. The control module 20 can control the flow valve 31 to act according to the detection result of the detector 32 to change the reaction gas entering the gas inlet 121A. At least one of flow rate and gas pressure. For example, when the control module 20 receives the result detected by the detector 32 and determines that the gas pressure or the gas flow rate of the reaction gas discharged from the gas discharge port 121B is lower than the predetermined gas pressure or the predetermined air pressure flow rate The control module 20 may correspond to the control flow valve 31 to increase the flow rate of the reaction gas into the pneumatic rotary assembly 12 through the gas inlet 121A. Among them, the control module 20 may be connected to the flow valve 31 and the detector 32 in a wireless or wired manner, for example.

In the above-mentioned embodiments of the gas pressure reduction device of the present invention, in specific applications, the gas pressure reduction device 1 may also include an electric storage unit (for example, various types of rechargeable batteries). The power storage unit is electrically connected to the generator 11 to store the electric energy generated by the generator 11 accordingly. The electric energy stored in the power storage unit can be connected to any device that needs to be powered according to demand, and there is no limitation here.

Please refer to FIG. 6, which shows a block diagram of the fuel cell system of the present invention. As shown in the figure, the fuel cell system B is used to connect to the gas supply device C, and the gas supply device C is used to provide a reaction gas. The fuel cell system B includes: a fuel cell B1 and a gas pressure reducing device 1. In practical applications, the number of fuel cells B1 included in the fuel cell system B is not limited to a single one; the number of gas pressure reducing devices 1 is also not limited to a single one.

The fuel cell B1 includes two reaction gas inlets B11 and a reaction product outlet B12. The two reaction gases respectively entering the fuel cell B1 through the two reaction gas inlets 121A can undergo chemical reactions in the fuel cell B1 to generate a reaction product and a first electric energy E1. Among them, the reaction product can be discharged to the outside through the reaction product discharge port B12. Specifically, the reaction gas entering from one of the reaction gas inlet ports B11 may be hydrogen, the reaction gas entering from the other reaction gas inlet port B11 may be oxygen, and the reaction product may be water, but the reaction gas The types and reaction products are not limited to this.

The gas pressure reduction device 1 is connected to the gas supply device C and one of the reaction gas inlet ports B11. The gas pressure reduction device 1 is used to reduce the gas pressure of the reaction gas provided by the gas supply device C so as to reduce the gas pressure of the reaction gas to a predetermined value After the air pressure value, enter the fuel cell B1. For a detailed description of the gas pressure reducing device 1, please refer to the foregoing embodiment, and will not be repeated here. After the reaction gas provided by the gas supply device C passes through the gas pressure reducing device 1, the generator 11 of the gas pressure reducing device 1 will correspondingly generate a second electric energy E2.

As mentioned above, the fuel cell system B of the present invention can generate two kinds of electrical energy (the second electrical energy E2 and the first electrical energy E1) when operating, and the fuel cell system B of the present invention has more advantages than traditional fuel cells. Good power generation efficiency.

It is worth mentioning that in the embodiment where the fuel cell B1 is connected to two gas supply devices, and the two gas supply devices provide two different high-pressure reaction gases respectively, the fuel cell B1 of the fuel cell system B of the present invention can Two gas pressure reducing devices 1 are connected, and the two gas pressure reducing devices 1 are correspondingly connected to the two reaction gas inlets B11 of the fuel cell B1. In this way, the high pressure reaction gas provided by the two gas supply devices C respectively, After passing through the corresponding gas pressure reducing device 1, it will not only decrease to a predetermined pressure value, but also generate additional electrical energy.

Please refer to FIG. 7, which shows a block diagram of the electric vehicle of the present invention. As shown in the figure, the electric vehicle A includes a fuel cell system B, a high-pressure gas cylinder (the aforementioned gas supply device C), and a power storage unit D. The fuel cell system B is used to connect a high-pressure gas cylinder, and the high-pressure gas cylinder stores high-pressure reaction gas. The fuel cell system B includes: a fuel cell B1 and a gas pressure reducing device 1. The fuel cell system B referred to here is the same as the foregoing embodiment, and will not be described in detail below. The second electrical energy and the first electrical energy generated by the fuel cell system B can be stored in the power storage unit D, and the power storage unit D is used as a power source for the operation of the electric vehicle. The power storage unit D may include multiple rechargeable batteries. In the electric vehicle A of this embodiment, the remaining components except the fuel cell system B can be changed according to demand, for example, it can be the same as the related components of the existing electric vehicle that uses the fuel cell as the source of electricity. Be restricted.

The electric vehicle A of the present invention can generate additional electric energy because the gas pressure reduction device 1 in the fuel cell system B includes the pneumatic power generation module 10. Therefore, the fuel cell system B used in the electric vehicle A of the present invention is Compared with conventional fuel cell systems used in electric vehicles that use fuel cells as a source of electricity, it has better power generation efficiency.

In summary, the gas pressure reduction device, fuel cell system, and electric vehicle of the present invention can reduce the gas pressure of the reactant gas while also generating additional electricity. According to this, compared with the traditional fuel cell, it has more advantages. Good power generation efficiency.

The above descriptions are only the preferred and feasible embodiments of the present invention, which do not limit the scope of the present invention. Therefore, all equivalent technical changes made by using the description and drawings of the present invention are included in the protection scope of the present invention. .

A: Electric car B: Fuel cell system B1: Fuel cell B11: Reactive gas inlet B12: Reaction product discharge port C: gas supply equipment D: Power storage unit 1: Gas pressure reduction device 10: Pneumatic power generation module 11: Generator 111: Rotation axis 12: Pneumatic rotating assembly 121: Shell 121A: Gas inlet 121B: Gas outlet 122: Rotating slice 123: Rotation axis 13: Coupling 20: Control module 30: Flow control module 31: Flow valve 32: Detector E1: First electric energy E2: second electrical energy SP: housing space L: gap

Figure 1 is a block diagram of the gas pressure reduction device of the present invention.

Fig. 2 is a three-dimensional schematic diagram of the pneumatic rotating assembly of the gas pressure reducing device of the present invention.

Fig. 3 is a schematic front view of the pneumatic rotary assembly of the gas pressure reducing device of the present invention.

4 is a schematic side view of the pneumatic power generation module of the gas pressure reducing device of the present invention.

Fig. 5 is a block diagram of another embodiment of the gas pressure reducing device of the present invention.

Fig. 6 is a block diagram of the fuel cell system of the present invention.

Fig. 7 is a block diagram of the electric vehicle of the present invention.

C: gas supply equipment

B1: Fuel cell

B11: Reactive gas inlet

1: Gas pressure reduction device

10: Pneumatic power generation module

11: Generator

12: Pneumatic rotating assembly

121A: Gas inlet

121B: Gas outlet

E1: second electrical energy

E2: First electric energy

Claims (9)

A gas pressure reduction device is used to connect a gas supply device and a fuel cell. The gas pressure reduction device is used to reduce the gas pressure of a reaction gas provided by the gas supply device, so that the reaction gas The gas pressure is first reduced to a predetermined pressure value before entering the fuel cell, and the gas pressure reducing device includes: A pneumatic power generation module, which includes: A generator; and A pneumatic rotary assembly, which has a gas inlet and a gas outlet, the gas inlet is used to connect to the gas supply device, and the gas outlet is used to connect to a reaction gas inlet of the fuel cell; The pneumatic rotating assembly includes a rotating shaft, and the rotating shaft is connected to the generator; Wherein, when the reaction gas provided by the gas supply device enters the pneumatic rotating assembly through the gas inlet and drives the rotating shaft to rotate, the generator will be driven by the rotating shaft. Corresponding to the generation of electrical energy. The gas pressure reducing device according to claim 1, wherein the gas pressure reducing device further includes a control module and a flow control module, and the flow control module includes a flow valve and a detector, so The flow valve is connected to the gas inlet, and the detector is connected to the gas outlet; the detector is used to detect the gas pressure and gas flow rate of the reaction gas passing through the gas outlet At least one of; the control module can control the flow valve to act according to the result detected by the detector to change the flow rate of the reaction gas and the gas pressure through the gas inlet at least one. The gas pressure reducing device according to claim 1, wherein the pneumatic rotary assembly includes: A housing having the gas inlet and the gas outlet, and the housing has an accommodating space inside; A plurality of rotating sheets, which are fixed to each other at intervals, and the plurality of rotating sheets are arranged in the housing and correspondingly located in the accommodating space; A part of the rotating shaft is located in the accommodating space, a part of the rotating shaft is exposed from the housing, and a part of the rotating shaft exposed from the housing is connected to the generator; Wherein, when the reaction gas enters the accommodating space through the gas inlet, the reaction gas will flow into the gap between the two adjacent rotating plates, and based on the boundary layer effect, The plurality of rotating pieces will rotate relative to the casing, and the rotating shaft will rotate with the plurality of rotating pieces relative to the casing. A fuel cell system is used to connect with a gas supply device, the gas supply device is used to provide a reaction gas, and the fuel cell system includes: At least one fuel cell includes a first reaction gas inlet, a second reaction gas inlet, and a reaction product discharge outlet, and the reaction of entering the fuel cell from the first reaction gas inlet and the second reaction gas respectively The gas can undergo a chemical reaction in the fuel cell to produce a reaction product and a first electric energy, and the reaction product can be discharged to the outside through the reaction product outlet; and A gas pressure reduction device connected to the gas supply device and the first reaction gas inlet, and the gas pressure reduction device is used to first reduce the gas pressure of the reaction gas provided by the gas supply device to a predetermined pressure After entering the fuel cell, the gas pressure reduction device includes: A pneumatic power generation module, which includes: A generator; and A pneumatic rotary assembly, which has a gas inlet and a gas outlet, the gas inlet is used to connect to the gas supply device, and the gas outlet is used to connect to a reaction gas inlet of the fuel cell; The pneumatic rotating assembly includes a rotating shaft, and the rotating shaft is connected to the generator; Wherein, when the reaction gas provided by the gas supply device enters the pneumatic rotating assembly through the gas inlet and drives the rotating shaft to rotate, the generator will be driven by the rotating shaft. Correspondingly generate a second electric energy. The fuel cell system according to claim 4, wherein the gas pressure reducing device further includes a control module and a flow control module, the flow control module includes a flow valve and a detector, the The flow valve is connected to the gas inlet, and the detector is connected to the gas outlet; the detector is used to detect the gas pressure and the gas flow of the reaction gas passing through the gas outlet At least one; the control module can correspondingly control the actuation of the flow valve according to the result detected by the detector to change at least the flow rate and gas pressure of the reaction gas passing through the gas inlet One. The fuel cell system according to claim 4, wherein the pneumatic rotary assembly includes: A housing having the gas inlet and the gas outlet, and the housing has an accommodating space inside; A plurality of rotating sheets, which are fixed to each other at intervals, and the plurality of rotating sheets are arranged in the housing and correspondingly located in the accommodating space; A part of the rotating shaft is located in the accommodating space, a part of the rotating shaft is exposed from the housing, and a part of the rotating shaft exposed from the housing is connected to the generator; Wherein, when the reaction gas enters the accommodating space through the gas inlet, the reaction gas will flow into the gap between the two adjacent rotating plates, and based on the boundary layer effect, The plurality of rotating sheets will rotate relative to the housing, and the rotating shaft will rotate with the plurality of rotating sheets relative to the housing. An electric vehicle, which includes: At least one high-pressure gas cylinder for storing high-pressure reaction gas inside; A fuel cell system, the fuel cell system comprising: At least one fuel cell includes two reaction gas inlets and a reaction product discharge outlet. The reaction gas entering the fuel cell through the two reaction gas inlets can carry out chemical reactions in the fuel cell, thereby Generating a reaction product and a first electrical energy, the reaction product can be discharged through the reaction product discharge port; and A gas pressure reducing device for reducing the gas pressure of the reaction gas provided by the high-pressure gas cylinder to a predetermined pressure value, so that the reaction gas having the predetermined pressure value enters the fuel cell, The gas pressure reducing device includes: A pneumatic power generation module, which includes: A generator; and A pneumatic rotary assembly, which has a gas inlet and a gas outlet, the gas inlet is used to connect the high-pressure gas cylinder, and the gas outlet is used to connect one of the reaction gases of the fuel cell Inlet; the pneumatic rotating assembly includes a rotating shaft, the rotating shaft is connected with the generator; Wherein, when the reaction gas provided by the high-pressure gas cylinder enters the pneumatic rotating assembly through the gas inlet and drives the rotating shaft to rotate, the generator will be driven by the rotating shaft. Correspondingly generate a second electrical energy; and An electric storage unit is used to store the first electric energy and the second electric energy generated by the fuel cell system, and the electric storage unit serves as a source of electric power required by the electric vehicle during operation. The electric vehicle according to claim 7, wherein the gas pressure reducing device further includes a control module and a flow control module, the flow control module including a flow valve and a detector, the flow The valve is connected to the gas inlet, and the detector is connected to the gas outlet; the control module can be based on at least one of the gas pressure and gas flow detected by the detector, and The actuation of the flow valve is correspondingly controlled to change at least one of the flow rate and the gas pressure of the reaction gas entering the gas inlet. The electric vehicle according to claim 7, wherein the pneumatic rotating assembly includes: A housing having the gas inlet and the gas outlet, and the housing has an accommodating space inside; A plurality of rotating sheets, which are fixed to each other at intervals, and the plurality of rotating sheets are arranged in the housing and correspondingly located in the accommodating space; A part of the rotating shaft is located in the accommodating space, a part of the rotating shaft is exposed from the housing, and a part of the rotating shaft is exposed from the housing for connecting with the generator; Wherein, when the reaction gas enters the accommodating space through the fluid inlet, the reaction gas can flow into the gap between the two adjacent rotating plates, and penetrate the boundary layer effect to The plurality of rotating pieces are rotated with respect to the housing around the rotating shaft.

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