阅读说明：本技术 一种基于相变储能的燃料电池电源系统 (Fuel cell power supply system based on phase change energy storage ) 是由 徐增师 张海波 王振 彭冰蓉 金鑫 于 2021-08-26 设计创作，主要内容包括：本发明公开了一种基于相变储能的燃料电池电源系统,包括燃料电池、循环组件、冷却组件及储能组件,燃料电池具有进氢口、排气口、冷却液入口及冷却液出口；循环组件包括第一换热管、气液分离器及气循环泵,第一换热管的一端与排气口相连通,气液分离器的进气端与第一换热管的另一端相连通,气循环泵的进气端与气液分离器的出气端,气循环泵的出气端与进氢口相连通；冷却组件包括储液罐、液循环泵及第二换热管,储液罐具的进液口与冷却液出口相连通,液循环泵的进液端与出液口相连通,第二换热管与液循环泵的出液端、冷却液入口相连通；储能组件包括储能罐,储能罐与第一换热管和第二换热管均热连接。本发明能有效利用燃料电池生成的废热。(The invention discloses a fuel cell power supply system based on phase change energy storage, which comprises a fuel cell, a circulation assembly, a cooling assembly and an energy storage assembly, wherein the fuel cell is provided with a hydrogen inlet, an exhaust port, a cooling liquid inlet and a cooling liquid outlet; the circulating assembly comprises a first heat exchange tube, a gas-liquid separator and a gas circulating pump, one end of the first heat exchange tube is communicated with the exhaust port, the gas inlet end of the gas-liquid separator is communicated with the other end of the first heat exchange tube, the gas inlet end of the gas circulating pump is communicated with the gas outlet end of the gas-liquid separator, and the gas outlet end of the gas circulating pump is communicated with the hydrogen inlet; the cooling assembly comprises a liquid storage tank, a liquid circulating pump and a second heat exchange tube, wherein a liquid inlet of the liquid storage tank is communicated with a cooling liquid outlet, a liquid inlet end of the liquid circulating pump is communicated with a liquid outlet, and the second heat exchange tube is communicated with a liquid outlet end of the liquid circulating pump and a cooling liquid inlet; the energy storage assembly comprises an energy storage tank, and the energy storage tank is connected with the first heat exchange tube and the second heat exchange tube in a soaking mode. The invention can effectively utilize the waste heat generated by the fuel cell.)

1. A phase change energy storage based fuel cell power system, comprising:

a fuel cell having a hydrogen inlet, an exhaust, a coolant inlet, and a coolant outlet;

the circulating assembly comprises a first heat exchange tube, a gas-liquid separator and a gas circulating pump, one end of the first heat exchange tube is communicated with the exhaust port, the gas inlet end of the gas-liquid separator is communicated with the other end of the first heat exchange tube, the gas inlet end of the gas circulating pump is communicated with the gas outlet end of the gas-liquid separator, and the gas outlet end of the gas circulating pump is communicated with the hydrogen inlet;

the cooling assembly comprises a liquid storage tank, a liquid circulating pump and a second heat exchange tube, wherein the liquid storage tank is provided with a liquid inlet and a liquid outlet, the liquid inlet is communicated with the cooling liquid outlet, the liquid inlet end of the liquid circulating pump is communicated with the liquid outlet, and one end of the second heat exchange tube is communicated with the liquid outlet end of the liquid circulating pump and the other end of the second heat exchange tube is communicated with the cooling liquid inlet;

the energy storage assembly comprises an energy storage tank, the energy storage tank is connected with the first heat exchange tube and the second heat exchange tube in a soaking mode and used for exchanging heat with the first heat exchange tube and the second heat exchange tube.

2. The phase-change energy storage based fuel cell power system as claimed in claim 1, wherein the cooling assembly further comprises a liquid filter, a liquid inlet end of the liquid filter is communicated with the other end of the second heat exchange pipe, and a liquid outlet end of the liquid filter is communicated with the cooling liquid inlet, and the liquid filter is used for filtering the liquid flowing into the cooling liquid inlet from the second heat exchange pipe.

3. The phase-change energy storage based fuel cell power system as claimed in claim 2, wherein the cooling assembly further comprises a solenoid valve, a liquid inlet end of the solenoid valve is communicated with a liquid outlet end of the liquid filter, and a liquid outlet end of the solenoid valve is communicated with a liquid inlet of the liquid storage tank.

4. The phase-change energy storage based fuel cell power system as claimed in claim 1, wherein the fuel cell further has an oxygen inlet, the phase-change energy storage based fuel cell power system further comprises an air supply assembly, the air supply assembly comprises an air filter, an air compressor, an intercooler and a humidifier which are sequentially communicated along an air flow path, and an air outlet of the humidifier is communicated with the oxygen inlet of the fuel cell.

5. The phase-change energy storage based fuel cell power system as claimed in claim 4, wherein the air filter is provided therein with a first heat dissipation flow channel, a liquid inlet end of the first heat dissipation flow channel is communicated with the energy storage tank, the air compressor is provided therein with a second heat dissipation flow channel, a liquid inlet end of the second heat dissipation flow channel is communicated with a liquid outlet end of the first heat dissipation flow channel, the air supply assembly further comprises a delivery pump, a liquid inlet end of the delivery pump is communicated with a liquid outlet end of the second heat dissipation flow channel, and a liquid outlet end of the delivery pump is communicated with the energy storage tank.

6. The phase-change energy storage based fuel cell power system as claimed in claim 1, further comprising a hydrogen supply assembly, wherein the hydrogen supply assembly comprises a hydrogen storage tank, an emergency cut-off valve, a hydrogen filter, a pressure reducing valve and a check valve which are sequentially communicated, and an air outlet end of the check valve is communicated with a hydrogen inlet of the fuel cell.

7. The phase-change energy storage based fuel cell power system as claimed in claim 1, wherein the energy storage tank stores a phase-change material in a liquid state, and the energy storage assembly further comprises a heater operable to heat the phase-change material in the energy storage tank.

8. The phase-change energy storage based fuel cell power system as claimed in claim 7, wherein the energy storage assembly further comprises a communication pump and a liquid radiator, the liquid inlet end of the communication pump is communicated with the energy storage tank, the liquid radiator has a liquid inlet end and a liquid outlet end, the liquid inlet end of the liquid radiator is communicated with the liquid outlet end of the communication pump, and the liquid outlet end of the liquid radiator is communicated with the energy storage tank for dissipating heat of liquid flowing through the liquid radiator.

9. The phase-change energy storage based fuel cell power system as claimed in claim 1, wherein the cooling assembly further comprises a drain valve and a liquid supplementing valve, the drain valve is disposed at the bottom of the liquid storage tank and has a liquid inlet end communicated with the liquid storage tank, and a liquid outlet end communicated with the liquid storage tank.

10. The phase-change energy storage based fuel cell power system as claimed in claim 6, wherein the hydrogen supply assembly further comprises a pressure relief valve disposed between the pressure relief valve and the check valve and in communication with an outlet end of the pressure relief valve.

Technical Field

The invention relates to the technical field of fuel cells, in particular to a fuel cell power supply system based on phase change energy storage.

Background

The fuel cell is a high-efficiency, energy-saving and environment-friendly power generation device, is a power generation device for directly converting chemical energy stored in fuel into electric energy, and has the advantages of high energy conversion efficiency, low vibration noise, zero emission, environmental friendliness and the like. Therefore, compared with the common portable UPS standby power supply (such as a diesel/gasoline engine and a storage battery), the fuel cell has wide market application prospect in the field of portable power supplies.

Chinese patent with publication number CN108172864A discloses a heat storage device for waste heat of fuel cell based on phase-change material, which comprises a fuel cell, wherein the fuel cell comprises a cooling liquid inlet and outlet of the fuel cell, the cooling liquid outlet of the fuel cell is connected with a cooling liquid storage tank coated with the phase-change material, the cooling liquid storage tank comprises a high-temperature cooling liquid inlet, a make-up water tank inlet and a cooling liquid outlet, and the storage tank make-up water tank inlet is connected with a make-up water tank and a water pump.

The device only recovers the heat energy of the cooling system of the fuel cell, does not utilize the heat energy of the exhaust of the fuel cell, causes the waste of the heat energy of the exhaust and does not fully utilize the energy.

Disclosure of Invention

In view of the above, it is necessary to provide a fuel cell power system based on phase change energy storage, which solves the technical problem in the prior art that the fuel cell does not use the heat of the exhaust gas.

In order to achieve the above technical object, a technical solution of the present invention provides a fuel cell power system based on phase change energy storage, including:

a fuel cell having a hydrogen inlet, an exhaust, a coolant inlet, and a coolant outlet;

the circulating assembly comprises a first heat exchange tube, a gas-liquid separator and a gas circulating pump, one end of the first heat exchange tube is communicated with the exhaust port, the gas inlet end of the gas-liquid separator is communicated with the other end of the first heat exchange tube, the gas inlet end of the gas circulating pump is communicated with the gas outlet end of the gas-liquid separator, and the gas outlet end of the gas circulating pump is communicated with the hydrogen inlet;

the cooling assembly comprises a liquid storage tank, a liquid circulating pump and a second heat exchange tube, wherein the liquid storage tank is provided with a liquid inlet and a liquid outlet, the liquid inlet is communicated with the cooling liquid outlet, the liquid inlet end of the liquid circulating pump is communicated with the liquid outlet, and one end of the second heat exchange tube is communicated with the liquid outlet end of the liquid circulating pump and the other end of the second heat exchange tube is communicated with the cooling liquid inlet;

the energy storage assembly comprises an energy storage tank, the energy storage tank is connected with the first heat exchange tube and the second heat exchange tube in a soaking mode and used for exchanging heat with the first heat exchange tube and the second heat exchange tube.

Further, the cooling assembly further comprises a liquid filter, wherein the liquid inlet end of the liquid filter is communicated with the other end of the second heat exchange tube, and the liquid outlet end of the liquid filter is communicated with the cooling liquid inlet, so that the liquid flowing into the cooling liquid inlet through the second heat exchange tube is filtered.

Furthermore, the cooling assembly further comprises an electromagnetic valve, wherein a liquid inlet end of the electromagnetic valve is communicated with a liquid outlet end of the liquid filter, and a liquid outlet end of the electromagnetic valve is communicated with a liquid inlet of the liquid storage tank.

Further, the fuel cell is also provided with an oxygen inlet, the fuel cell power supply system based on the phase change energy storage further comprises an air supply assembly, the air supply assembly comprises an air filter, an air compressor, an intercooler and a humidifier which are sequentially communicated along an air flow path, and an air outlet end of the humidifier is communicated with the oxygen inlet of the fuel cell.

Further, a first heat dissipation flow channel is arranged in the air filter, a liquid inlet end of the first heat dissipation flow channel is communicated with the energy storage tank, a second heat dissipation flow channel is arranged in the air compressor, a liquid inlet end of the second heat dissipation flow channel is communicated with a liquid outlet end of the first heat dissipation flow channel, the air supply assembly further comprises a delivery pump, a liquid inlet end of the delivery pump is communicated with a liquid outlet end of the second heat dissipation flow channel, and a liquid outlet end of the delivery pump is communicated with the energy storage tank.

Further, still including supplying hydrogen the subassembly, supply hydrogen the subassembly including the hydrogen storage tank, quick action emergency valve, hydrogen filter, relief pressure valve and the check valve that communicate in proper order, the end of giving vent to anger of check valve with fuel cell's hydrogen inlet is linked together.

Further, the liquid phase-change material is stored in the energy storage tank, and the energy storage assembly further comprises a heater which can be used for heating the phase-change material in the energy storage tank.

Further, the energy storage subassembly is still including intercommunication pump and liquid radiator, the feed liquor end of intercommunication pump with the energy storage jar is linked together, liquid radiator has feed liquor end and goes out the liquid end, liquid radiator's feed liquor end with the play liquid end of intercommunication pump is linked together, liquid radiator's play liquid end with the energy storage jar is linked together for the convection current liquid of liquid radiator dispels the heat.

Furthermore, the cooling assembly further comprises a liquid discharge valve and a liquid supplementing valve, the liquid discharge valve is arranged at the bottom of the liquid storage tank, a liquid inlet end of the liquid discharge valve is communicated with the liquid storage tank, and a liquid outlet end of the liquid supplementing valve is communicated with the liquid storage tank.

Further, the hydrogen supply assembly further comprises a pressure relief valve, and the pressure relief valve is arranged between the pressure relief valve and the check valve and communicated with the air outlet end of the pressure relief valve.

Compared with the prior art, the invention has the beneficial effects that: gas that generates among the fuel cell gets into circulation subassembly through the gas vent, contain hydrogen and vapor in the high temperature tail gas of fuel cell exhaust, when high temperature tail gas passes through first heat exchange tube, heat in the high temperature tail gas is absorbed by the energy storage jar and stores heat energy, tail gas is cooled down because of the heat is absorbed simultaneously, the in-process of cooling makes the vapor liquefaction in the tail gas, moisture in the tail gas is got rid of to tail gas under vapour and liquid separator's effect to tail gas, vapor content in the tail gas has been reduced, tail gas after the processing gets into the hydrogen inlet end that returns fuel cell through the gas circulation pump, carry out electrochemical reaction with oxygen in the fuel cell, hydrogen in the ability cyclic utilization tail gas.

The liquid circulating pump is started, low-temperature cooling liquid in the liquid storage tank sequentially enters the fuel cell through the liquid circulating pump after passing through the second heat exchange tube and the liquid filter, the fuel cell is cooled in a circulating mode, heat exchange is carried out between the cooling liquid and the energy storage tank when the cooling liquid passes through the second heat exchange tube, the heat of the cooling liquid is absorbed by the energy storage tank and then is cooled, and the cooled cooling liquid enters the fuel cell to be cooled.

When the fuel cell needs low-temperature starting, start the liquid circulating pump, the liquid circulating pump flows through liquid circulating pump, second heat exchange tube, liquid filter with the coolant circulation of storing in the liquid storage pot to return the liquid storage pot, when the coolant liquid passes through the second heat exchange tube, the heat of energy storage jar is absorbed to the coolant liquid, can heat up the coolant liquid in the liquid storage pot, when the temperature reaches the required temperature of fuel cell normal operating, make fuel cell satisfy the requirement of cold-start.

By adopting the phase-change energy storage technology, the waste heat generated by the fuel cell and the waste heat in tail gas in the working process of the fuel cell power supply system can be absorbed and stored, and the heat energy is released to store and start the fuel cell power supply system for a long time under the low-temperature working condition so as to supply heat, thereby improving the utilization efficiency of energy;

drawings

Fig. 1 is a schematic structural diagram of a fuel cell power system based on phase change energy storage according to the present invention.

Detailed Description

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate preferred embodiments of the invention and together with the description, serve to explain the principles of the invention and not to limit the scope of the invention.

As shown in fig. 1, the present invention provides a fuel cell power system based on phase change energy storage, which includes a fuel cell 1, a circulation component 2, a cooling component 3, and an energy storage component 4, wherein the fuel cell 1 has a hydrogen inlet, an oxygen inlet, an exhaust outlet, a coolant inlet, and a coolant outlet; the circulation component 2 is communicated with the hydrogen inlet and the oxygen inlet and is used for separating hydrogen in the tail gas of the fuel cell 1 and introducing the separated hydrogen into the hydrogen inlet of the fuel cell 1; the circulating assembly 2 is communicated with the cooling liquid inlet and the cooling liquid outlet and is used for providing circulating cooling liquid for the fuel cell; the energy storage assembly 4 is connected with the circulating assembly 2 and the cooling assembly 3 in a soaking mode and used for exchanging heat with the circulating assembly 2 and the cooling assembly 3.

In one embodiment, the circulation assembly 2 includes a first heat exchange tube 21, a gas-liquid separator 22 and a gas circulation pump 23, one end of the first heat exchange tube 21 is communicated with the exhaust port, an air inlet end of the gas-liquid separator 22 is communicated with the other end of the first heat exchange tube 21, an air inlet end of the gas circulation pump 23 is communicated with an air outlet end of the gas-liquid separator 22, and an air outlet end of the gas circulation pump 23 is communicated with the hydrogen inlet. Gas generated in the fuel cell 1 enters the circulating component 2 through the exhaust port, hydrogen and steam are contained in high-temperature tail gas exhausted by the fuel cell 1, when the high-temperature tail gas passes through the first heat exchange tube 21, heat in the high-temperature tail gas is absorbed by a phase-change material in the energy storage tank and stores heat energy, meanwhile, the tail gas is cooled due to the heat absorption, the steam in the tail gas is liquefied in the cooling process, moisture in the tail gas is removed under the action of the gas-liquid separator 22, the content of the steam in the tail gas is reduced, the treated tail gas enters the hydrogen inlet end returning to the fuel cell 1 through the gas circulating pump 23, electrochemical reaction is carried out with oxygen in the fuel cell 1, and the hydrogen in the tail gas can be recycled.

The first heat exchange tube 21 is a coil, and the contact area between the coil and the phase-change material in the energy storage tank 41 is increased through the coil, so that the coil and the phase-change material can exchange heat sufficiently.

In one embodiment, the cooling module 3 includes a liquid storage tank 31, a liquid circulating pump 32 and a second heat exchanging pipe 33, the liquid storage tank 31 has a liquid inlet and a liquid outlet, the liquid inlet is communicated with the cooling liquid outlet, the liquid inlet of the liquid circulating pump 32 is communicated with the liquid outlet, and one end of the second heat exchanging pipe 33 is communicated with the liquid outlet of the liquid circulating pump 32 and the other end is communicated with the cooling liquid inlet. Through setting up cooling module 3, can dispel the heat and give phase change material with heat transfer to fuel cell 1 through the endless coolant liquid to heat the coolant liquid through the energy storage jar, can heat up fuel cell 1, make fuel cell 1 reach preset temperature and start.

The second heat exchange tube 33 is a coil, and the contact area between the coil and the phase-change material in the energy storage tank 41 is increased through the coil, so that the coil and the phase-change material can exchange heat sufficiently.

Preferably, the cooling assembly 3 further comprises a liquid discharge valve 34 and a liquid supplement valve 35, the liquid discharge valve 34 is disposed at the bottom of the liquid storage tank 31, a liquid inlet end of the liquid discharge valve 34 is communicated with the liquid storage tank 31, and a liquid outlet end of the liquid supplement valve 35 is communicated with the liquid storage tank 31. The drain valve 34 is provided to drain the excess liquid in the reservoir 31, and the replenishment valve 35 is provided to fill the reservoir 31 with the coolant.

Preferably, the cooling module 3 further comprises a liquid filter 36, wherein a liquid inlet end of the liquid filter 36 is communicated with the other end of the second heat exchanging pipe 33, and a liquid outlet end of the liquid filter 36 is communicated with the cooling liquid inlet, and is used for filtering the liquid flowing into the cooling liquid inlet of the second heat exchanging pipe 33. By providing the liquid filter 36, the circulating cooling liquid can be filtered.

Preferably, the cooling assembly 3 further comprises a solenoid valve 37, a liquid inlet end of the solenoid valve 37 is communicated with a liquid outlet end of the liquid filter 36, and a liquid outlet end of the solenoid valve 37 is communicated with a liquid inlet of the liquid storage tank 31. By arranging the electromagnetic valve 37, when the fuel cell 1 needs to be started at a low temperature, the electromagnetic valve 37 is opened, the liquid circulating pump 32 is started, the liquid circulating pump 32 circulates the cooling liquid stored in the liquid storage tank 31 and flows through the liquid circulating pump 32, the second heat exchange pipe 33, the liquid filter 36 and the electromagnetic valve 37, and the cooling liquid returns to the liquid storage tank 31 through the electromagnetic valve 37, when the cooling liquid passes through the second heat exchange pipe 33, the cooling liquid absorbs the heat of the phase change material in the energy storage tank, the temperature of the cooling liquid in the liquid storage tank 31 can be raised, and when the temperature reaches the temperature required by the normal operation of the fuel cell 1, the electromagnetic valve 37 is closed.

In one embodiment, the energy storage assembly 4 comprises an energy storage tank 41, and the energy storage tank 41 is connected with the first heat exchange pipe 21 and the second heat exchange pipe 33 in a soaking mode and used for exchanging heat with the first heat exchange pipe 21 and the second heat exchange pipe 33.

Preferably, the energy storage tank 41 stores liquid phase-change material, and the energy storage assembly 4 further includes a heater 42, wherein the heater 42 can be used for heating the phase-change material in the energy storage tank 41.

Wherein, the phase-change material can be water, heat-conducting oil, etc.; the heater 42 may be a heating wire or the like.

Preferably, the energy storage assembly 4 further includes a communication pump 43 and a liquid radiator 44, a liquid inlet end of the communication pump 43 is communicated with the energy storage tank 41, the liquid radiator 44 has a liquid inlet end and a liquid outlet end, the liquid inlet end of the liquid radiator 44 is communicated with the liquid outlet end of the communication pump 43, and the liquid outlet end of the liquid radiator 44 is communicated with the energy storage tank 41, and is used for dissipating heat of liquid flowing through the liquid radiator 44. By arranging the communication pump 43 and the liquid radiator 44, after the communication pump 43 is started, the phase-change material can be driven to circularly pass through the liquid radiator 44, and the phase-change material is cooled under the action of the liquid radiator 44.

In one embodiment, the power supply system of the fuel cell 1 based on the phase change energy storage technology further includes an air supply assembly 5, the air supply assembly 5 includes an air filter 51, an air compressor 52, an intercooler 53 and a humidifier 54 which are sequentially communicated along an air flow path, and an air outlet end of the humidifier 54 is communicated with an oxygen inlet of the fuel cell 1. The air filter 51, the air compressor 52, the intercooler 53 and the humidifier 54 are arranged to sequentially filter, pressurize, cool and humidify the air, so that the air enters the fuel cell 1 at a certain temperature, humidity and pressure.

Preferably, the air filter 51 has a first heat dissipation flow channel therein, a liquid inlet end of the first heat dissipation flow channel is communicated with the energy storage tank 41, the air compressor 52 has a second heat dissipation flow channel therein, a liquid inlet end of the second heat dissipation flow channel is communicated with a liquid outlet end of the first heat dissipation flow channel, the air supply assembly 5 further includes a delivery pump 55, a liquid inlet end of the delivery pump 55 is communicated with a liquid outlet end of the second heat dissipation flow channel, and a liquid outlet end of the delivery pump 55 is communicated with the energy storage tank 41.

In one embodiment, the fuel cell power system based on phase change energy storage further comprises a hydrogen supply assembly 6, wherein the hydrogen supply assembly 6 comprises a hydrogen storage tank 61, an emergency cut-off valve 62, a hydrogen filter 63, a pressure reducing valve 64 and a check valve 65 which are sequentially communicated, and an air outlet end of the check valve 65 is communicated with a hydrogen inlet of the fuel cell 1.

Preferably, the hydrogen supply assembly 6 further comprises a pressure relief valve 66, the pressure relief valve 66 being disposed between the pressure relief valve 64 and the check valve 65 and communicating with the outlet end of the pressure relief valve.

In one embodiment, the fuel cell power system based on phase change energy storage further comprises a hydrogen concentration detector 7, a flame detector 8 and a temperature detector 9, wherein the hydrogen concentration detector 7, the flame detector 8 and the temperature detector 9 are respectively used for monitoring the hydrogen concentration, flame and temperature of the power cabin, the emergency cut-off valve 62 and the communication pump 43 can be controlled according to signals fed back by the hydrogen concentration detector 7, the flame detector 8 and the temperature detector 9, an alarm can be given in time in abnormal conditions, the hydrogen source is cut off, the cabin temperature is increased, and the safety of the fuel cell power system is improved.

The specific working process of the invention is as follows: the high-pressure hydrogen gas in the hydrogen storage tank 61 is filtered, decompressed and formed into low-pressure hydrogen gas through the quick disconnect valve 62, the hydrogen filter 63, the decompression valve 64 in this order, and the low-pressure hydrogen gas then passes through the check valve 65 and enters the hydrogen inlet of the fuel cell 1 through the check valve 65.

The air is filtered, pressurized, cooled and humidified by an air filter 51, an air compressor 52, an intercooler 53 and a humidifier 54 in sequence to form air with moderate pressure, and the air enters an oxygen inlet of the fuel cell 1. The hydrogen and the air perform electrochemical reaction in the fuel cell 1 pile to output electric energy, the output electric energy supplies power for electric components inside a power supply system of the fuel cell 1 and external electric equipment through a control and energy management device, and if the electric energy is rich, the energy storage battery is charged, so that the electric energy storage of the battery is sufficient.

Gas generated in the fuel cell 1 enters the circulating component 2 through the exhaust port, hydrogen and steam are contained in high-temperature tail gas exhausted by the fuel cell 1, when the high-temperature tail gas passes through the first heat exchange tube 21, heat in the high-temperature tail gas is absorbed by the phase-change material in the energy storage tank 41 and stores heat energy, meanwhile, the tail gas is cooled due to the heat absorption, the steam in the tail gas is liquefied in the cooling process, moisture in the tail gas is removed under the action of the gas-liquid separator 22, the content of the steam in the tail gas is reduced, the treated tail gas enters the hydrogen inlet end returning to the fuel cell 1 through the gas circulating pump 23, electrochemical reaction is carried out with oxygen in the fuel cell 1, and the hydrogen in the tail gas can be recycled.

When air enters the oxygen inlet of the fuel cell 1, the air compressor 52 and the intercooler 53 work and generate heat, the transfer pump 55 is started, the phase-change material absorbed by heat in the heat dissipation flow channel of the air compressor 52 and the intercooler 53 is sent to the energy storage tank 41 by the transfer pump 55, the phase-change material in the energy storage tank 41 flows into the heat dissipation flow channel of the air compressor 52 and the intercooler 53, and the air compressor 52 and the intercooler 53 can be cooled and the heat generated when the air compressor 52 and the intercooler 53 work is collected.

The liquid circulating pump 32 is started, the low-temperature cooling liquid in the liquid storage tank 31 sequentially passes through the second heat exchange tube 33 and the liquid filter 36 through the liquid circulating pump 32 and then enters the fuel cell 1, the fuel cell 1 is cooled in a circulating manner, when the cooling liquid passes through the second heat exchange tube 33, the cooling liquid exchanges heat with the phase-change material in the energy storage tank 41, the heat of the cooling liquid is absorbed by the phase-change material in the energy storage tank 41 and then is cooled, and the cooled cooling liquid enters the fuel cell 1 to be cooled in a circulating manner.

When the heat absorbed in the energy storage tank 41 is greater than the heat storage capacity of the energy storage tank 41, the communication pump 43 is started, the phase-change material in the energy storage tank 41 is pumped into the liquid radiator 44 by the communication pump 43, and the high-temperature phase-change material is radiated by the liquid radiator 44, so that the overhigh temperature of the phase-change material is avoided.

In the process of energy storage of the energy storage tank 41, the communication pump 43 is started, the communication pump 43 pumps the phase-change material in the energy storage tank 41 into the liquid radiator 44, so that heat is emitted outwards from the phase-change material, and the gas in the cabin is heated by the emitted heat.

When the fuel cell 1 needs to be started at a low temperature, the electromagnetic valve 37 is opened, the liquid circulating pump 32 is started, the liquid circulating pump 32 circulates the cooling liquid stored in the liquid storage tank 31 to flow through the liquid circulating pump 32, the second heat exchange pipe 33, the liquid filter 36 and the electromagnetic valve 37 and returns the cooling liquid to the liquid storage tank 31 through the electromagnetic valve 37, when the cooling liquid passes through the second heat exchange pipe 33, the cooling liquid absorbs the heat of the phase change material in the energy storage tank 41, the cooling liquid in the liquid storage tank 31 can be heated, when the temperature reaches the temperature needed by the normal operation of the fuel cell 1, the electromagnetic valve 37 is closed, if the heat stored in the energy storage tank 41 cannot meet the energy needed by the low-temperature starting of the fuel cell 1, the heater 42 is started, and the phase change material is subjected to auxiliary heating through the heater 42, so that the fuel cell 1 meets the requirement of cold starting.

1) By adopting the phase-change energy storage technology, the waste heat generated by the fuel cell 1 and the waste heat generated by the air supply assembly 5 and the cooling assembly 3 in the working process of the fuel cell power supply system can be absorbed and stored, and the heat energy is released to store and start heat supply for the fuel cell power supply system for a long time under the low-temperature working condition, so that the utilization efficiency of energy is improved.

2) In the working process of the fuel cell power system, excessive hydrogen in the circulating component 2 circulates through the first heat exchange tube 21 in the form of high-temperature tail gas, and is cooled due to the absorption of heat, so that the content of vapor in circulating hydrogen after gas-liquid separation can be reduced, the efficiency of the gas circulating pump 23 is improved, and the service life of the gas circulating pump is prolonged.

3) Through monitoring hydrogen concentration, flame and the temperature in power supply cabin, control the quick action emergency valve of hydrogen supply module and the circulating pump of phase change heat-retaining heating device, can in time report to the police and cut off the hydrogen source and improve the cabin temperature when abnormal conditions, improve fuel cell power supply system's security.

4) The fuel cell power supply system integrates two modes of waste heat storage, waste heat storage and a heater 42 in low-temperature storage and starting heat supply modes, the problem that the stored heat energy is insufficient when the fuel cell power supply system is stored at low temperature for a long time and started can be solved, and the use reliability of the fuel cell power supply system under severe working conditions can be improved.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.