A system for pressure management using a differential pressure valve

Abstract

The application discloses a system for realizing pressure management by using a pressure difference valve, comprising a fuel cell stack, an air compressor, an electrically-controlled three-way valve, an inlet stack pressure sensor, an air outlet throttle valve, a pressure difference valve, a hydrogen circulating pump and a hydrogen discharge valve; the electrically-controlled three-way valve is connected to the air outlet throttle valve after outputting air into the fuel cell stack; the pressure difference valve core pressure input is connected to the throttle valve input pipeline; the pressure difference valve is connected to a high-pressure air source; the pressure difference valve is output to the fuel cell stack; and the other input end of the pressure difference valve is connected to the hydrogen circulating pump. The application realizes dynamic adjustment of hydrogen input pressure by using the pressure difference valve, guarantees the performance consistency of different batches of products, and realizes the adjustment of hydrogen input pressure by using only one pressure difference valve, so that the system structure is simple, the pressure difference adjustment is quick and convenient, and the possibility of popularizing the use of fuel cells is improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of fuel cells, and particularly relates to a system for realizing pressure management by using a pressure difference valve. BACKGROUND

[0002] At present, with the wide application of electric vehicles, various battery technologies have been widely developed, which brings about the innovation of battery technology. Fuel cells have been widely applied because they can directly convert chemical energy into electrical energy. It is found in the use process that due to batch deviation of pressure sensors, hydrogen input pressures of different batches of products are different, which causes performance differences of fuel cells during operation. Therefore, a new architecture needs to be designed to realize consistent hydrogen input pressure of different batches of fuel cells. SUMMARY

[0003] The application solves the technical problems of the prior art and provides a system for realizing pressure management by using a pressure difference valve.

[0004] To achieve the above technical purposes, the technical scheme adopted by the application is as follows:

[0005] A system for realizing pressure management by using a pressure difference valve, comprising a fuel cell stack, an air compressor, an electrically-controlled three-way valve, an inlet stack pressure sensor, an outlet air throttle, a pressure difference valve, a hydrogen circulating pump and a hydrogen discharge valve.

[0006] The electrically-controlled three-way valve is connected to the outlet air throttle after outputting air into the fuel cell stack.

[0007] The pressure difference valve is connected to a high-pressure air source, and the output of the pressure difference valve is connected to the fuel cell stack.

[0008] The air compressor is connected to the electrically-controlled three-way valve, and the electrically-controlled three-way valve is further connected to the inlet stack pressure sensor.

[0009] The electrically-controlled three-way valve has flow resistance when outputting to the fuel cell stack.

[0010] The application has the following beneficial effects:

[0011] After the system for realizing pressure management by using a pressure difference valve is adopted, the dynamic adjustment of hydrogen input pressure is realized by using the pressure difference valve, the performance consistency of different batches of products is ensured, and since only one pressure difference valve is used to realize the adjustment of hydrogen input pressure, the system structure is simple, the pressure difference adjustment is quick and convenient, and the possibility of popularizing and using the fuel cell is improved. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 It is a system composition schematic diagram of the system for realizing pressure management by using a pressure difference valve.

[0013] Figure 2 It is a pressure difference valve schematic diagram of the system for realizing pressure management by using a pressure difference valve. DETAILED DESCRIPTION

[0014] The embodiments of the present application are further described in detail below with reference to the accompanying drawings.

[0015] Reference Figure 1 A system for realizing pressure management by using a pressure difference valve, the system comprising a fuel cell stack, an air compressor, an electrically controlled three-way valve, an inlet stack pressure sensor, an outlet air throttle, a pressure difference valve, a hydrogen circulating pump and a hydrogen exhaust valve;

[0016] The electrically controlled three-way valve is connected to the outlet air throttle after outputting air into the fuel cell stack.

[0017] The pressure difference valve is connected to a high-pressure gas source, and the output of the pressure difference valve is connected to the fuel cell stack, the output pressure of the pressure difference valve is the hydrogen inlet stack pressure P3, and the other input end of the pressure difference valve is connected to the hydrogen circulating pump. Figure 2 The interface 1 of the pressure difference valve is connected to the high-pressure gas source, the interface 2 is connected to the measured pressure source (P2), the interface 3 is the gas outlet connected to the stack, and the interface 4 is connected to the low-pressure gas source (hydrogen circulating pump). When the pressure difference valve works, the P2 pressure value received through the interface 2 controls the gas flow of the high-pressure gas source through the interface 1, so as to ensure that the difference between the pipeline pressure P3 of the interface 3 and the pipeline P2 of the interface 2 is a preset pressure value.

[0018] In specific implementation, the air compressor is connected to the electrically controlled three-way valve, the output port of the electrically controlled three-way valve is further connected to the inlet stack pressure sensor, and the other input of the electrically controlled three-way valve is connected to the outlet air throttle output pipeline.

[0019] The output of the electrically controlled three-way valve to the fuel cell stack has a flow resistance, that is, the valve core pressure value P2 of the pressure difference valve is the pressure P1 at the inlet stack minus the flow resistance ΔP of the stack and the front and rear pipelines.

[0020] In the embodiment, the hydrogen circulation pump is connected to a hydrogen outlet of the fuel cell, and the hydrogen outlet is further connected to a hydrogen discharge valve.

[0021] The pressure valve adjusts the amount of hydrogen from the high-pressure source by the pressure difference (P3-P2) between the hydrogen inlet pressure P3 and the pressure value P2 of the spool of the pressure difference valve, so as to maintain the pressure difference (P3-P2) between the hydrogen inlet pressure P3 and the pressure value P2 of the spool of the pressure difference valve as a constant value.

[0022] The system for pressure management using the pressure difference valve of the present application realizes dynamic adjustment of the hydrogen input pressure by using the pressure difference valve, guarantees the performance consistency of different batches of products, and because only one pressure difference valve is used to realize the adjustment of the hydrogen input pressure, the system is simple in structure, the pressure difference adjustment is quick and convenient, and the possibility of popularizing the use of the fuel cell is improved.

[0023] Although the present application has been described in detail with general description and specific embodiments above, some modifications or improvements can be made on the basis of the present application, which is obvious to those skilled in the art. Therefore, these modifications or improvements made on the basis of not deviating from the spirit of the present application are within the scope of the present application.

Claims

1. A system for pressure management using a differential pressure valve, characterized in that: The system includes a fuel cell stack, an air compressor, an electronically controlled three-way valve, a stack inlet pressure sensor, an outlet throttle valve, a differential pressure valve, a hydrogen circulation pump, and a hydrogen discharge valve. The air output from the electronically controlled three-way valve is connected to the outlet throttle valve after entering the fuel cell stack. The pressure input of the differential pressure valve core is connected to the outlet throttle valve input pipe. The differential pressure valve input is connected to a high-pressure gas source, the differential pressure valve output is sent to the fuel cell stack, and the other input of the differential pressure valve is connected to a hydrogen circulation pump; The air compressor output is connected to an electrically controlled three-way valve, and the output port of the electrically controlled three-way valve is also connected to an inlet pressure sensor. The other input of the electrically controlled three-way valve is connected to the outlet throttle valve output pipeline. There is flow resistance in the output of the electrically controlled three-way valve to the fuel cell stack. The other end of the hydrogen circulation pump is connected to the hydrogen outlet of the fuel cell, and the hydrogen outlet of the fuel cell is also connected to a hydrogen discharge valve.

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