CN114497625A

CN114497625A - Heat circulation system of fuel cell

Info

Publication number: CN114497625A
Application number: CN202210078717.2A
Authority: CN
Inventors: 邓家棋; 赵庆尧; 李强; 刘志祥
Original assignee: Guangdong Sinosynergy Hydrogen Power Technology Co ltd
Current assignee: Guangdong Sinosynergy Hydrogen Power Technology Co ltd
Priority date: 2022-01-24
Filing date: 2022-01-24
Publication date: 2022-05-13

Abstract

The invention relates to the technical field of thermal cycle of fuel cells, and discloses a thermal cycle system of a fuel cell, which comprises: the system comprises a heating loop, a heater, a first pump body, a galvanic pile, a three-way valve and a radiator, wherein the heating loop is used for cooling liquid to flow; the heater, the first pump body, the galvanic pile and the three-way valve are respectively and sequentially arranged along the heating loop; the liquid outlet of the radiator is communicated with the heating loop between the heater and the first pump body, and the liquid inlet of the radiator is communicated with the three-way valve. In cold environment, the heater in the heating loop heats the coolant and heats the galvanic pile with the coolant again, has shortened the cold start time of galvanic pile, and under the state of hot environment or galvanic pile normal operating, the radiator dispels the heat with the coolant, and the coolant after will dispel the heat is to the galvanic pile cooling, guarantees the operational requirement of galvanic pile, improves the adaptability of galvanic pile.

Description

Heat circulation system of fuel cell

Technical Field

The invention relates to the technical field of fuel cell thermal cycle, in particular to a thermal cycle system of a fuel cell.

Background

At present, for a high-power system, the mass of the bipolar plate of the galvanic pile, the mass of cooling liquid in a flow passage and the mass of cooling liquid of a pipeline inside the system are larger, and the energy required by cold start is correspondingly increased. The stack needs to be maintained at a suitable ambient temperature to ensure its efficiency and service life.

Disclosure of Invention

The purpose of the invention is: the fuel cell heat cycle system is provided, so that the heating of the electric pile is realized, and the electric pile system is changed from zero to an idling working condition or a rated working condition in a short time.

In order to achieve the above object, the present invention provides a heat cycle system of a fuel cell, comprising: the system comprises a heating loop, a heater, a first pump body, a galvanic pile, a three-way valve and a radiator, wherein the heating loop is used for cooling liquid to flow; the heater, the first pump body, the galvanic pile and the three-way valve are respectively and sequentially distributed along the heating loop; the liquid outlet of the radiator is communicated with the heating loop between the heater and the first pump body, and the liquid inlet of the radiator is communicated with the three-way valve.

Compared with the prior art, the heat cycle system of the fuel cell has the beneficial effects that: in cold environment, the heater in the heating loop heats the coolant and heats the galvanic pile with the coolant again, has shortened the cold start time of galvanic pile, and under the state of hot environment or galvanic pile normal operating, the radiator dispels the heat with the coolant, and the coolant after will dispel the heat is to the galvanic pile cooling, guarantees the operational requirement of galvanic pile, improves the adaptability of galvanic pile.

Further, the method also comprises the following steps: the cooling system comprises a converter, a cooling loop for flowing cooling liquid, and a second pump body; the radiator, the converter, and the second pump body are respectively disposed on the cooling circuit. The cooling circuit achieves a separate heat removal of the converter. The stability of heat dissipation of the converter is guaranteed.

Further, the converter is fixedly connected with the heater. The converter and the heater are fixedly connected together, so that the volume and space of the whole system can be reasonably distributed.

Further, the converter is internally provided with an accommodating cavity; the heater is arranged in the accommodating cavity. The heater is arranged in the converter, so that the space of the system can be saved, and the volume of the whole system is reduced.

Further, the three-way valve includes a first port, a second port, and a third port; the first port is communicated with the liquid outlet end of the galvanic pile, and the second end is communicated with the liquid inlet of the heater; the third end is communicated with a liquid inlet of the radiator. And a three-way valve is arranged, so that the flowing direction of the cooling liquid can be changed through the three-way valve, and the heating or heat dissipation of the galvanic pile is convenient to switch.

Further, the heater is also electrically connected to the converter. The heater is supplied with power from the converter, and the length of the power supply line can be shortened because the heater is disposed inside the converter.

Furthermore, a heat insulation layer is arranged on the outer surface of the heater. The heat insulation layer can effectively reduce the influence of the temperature of the heater on components in the converter.

Drawings

FIG. 1 is a flow diagram of a thermal cycle system according to an embodiment of the present invention;

FIG. 2 is a block diagram of a heater and converter according to an embodiment of the invention;

in the figure, 1, a heat sink; 2. a first pump body; 3. a galvanic pile; 4. a heater; 41. a first liquid inlet; 42. a first liquid outlet; 5. a converter; 51. a second liquid outlet; 52. a second liquid inlet; 6. a three-way valve; 7. a second pump body; 8. a first pipe member; 9. a second pipe member; 10. a third pipe member; 11. a fourth pipe member; 12. a fifth pipe fitting; 13. a sixth pipe member; 14. a seventh pipe; 15. an eighth pipe fitting; 16. a ninth tube.

Detailed Description

The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.

As shown in fig. 1 and 2, a heat cycle system of a fuel cell according to a preferred embodiment of the present invention includes: a heating loop for flowing cooling liquid, a heater 4, a first pump body 2, a galvanic pile 3, a three-way valve 6 and a radiator 1; the heater 4, the first pump body 2, the galvanic pile 3 and the three-way valve 6 are respectively and sequentially arranged along the heating loop; the liquid outlet of the radiator 1 is communicated with the heating loop between the heater 4 and the first pump body 2, and the liquid inlet of the radiator 1 is communicated with the three-way valve 6.

Compared with the prior art, the heat cycle system of the fuel cell has the beneficial effects that: in cold environment, the heater 4 in the heating loop heats the coolant and heats the galvanic pile 3 with the coolant again, has shortened the cold start time of galvanic pile 3, and under the hot environment or the state of galvanic pile 3 normal work, the radiator 1 dispels the heat with the coolant, and the coolant after will dispelling the heat cools off galvanic pile 3, guarantees the operational requirement of galvanic pile 3, improves the adaptability of galvanic pile 3.

In one embodiment, the three-way valve 6 includes a first port, a second port, and a third port; the first end is communicated with the liquid outlet end of the electric pile 3, and the second end is communicated with the liquid inlet of the heater 4; the third end is communicated with a liquid inlet of the radiator 1. Specifically, the three-way valve 6 is a three-way reversing valve. The three-way valve 6 is arranged, the flowing direction of the cooling liquid can be changed through the three-way valve 6, and the heating or heat dissipation of the galvanic pile 3 is convenient to switch.

The liquid outlet of radiator 1 passes through first pipe fitting 8 and fifth pipe fitting 12, and the inlet of radiator 1 passes through fourth pipe fitting 11 and three-way valve 6's third end intercommunication to this communicates heater 4 in heating circuit, and accessible three-way valve 6 changes the flow direction of coolant liquid, is convenient for switch over to the heating or the heat dissipation to pile 3. The radiator 1 is prevented from being re-provided with a pipeline to cool the galvanic pile 3, unnecessary pipeline use can be reduced, the size of the system can be reduced, and the distribution of each loop can be simpler and more reasonable.

In one embodiment, the radiator 1 communicates with the inlet end of the first pump body 2 through a first pipe 8; the outlet end of the first pump body 2 is communicated with the inlet of the electric pile 3 through a second pipe fitting 9; the outlet of the electric pile 3 is communicated with the first end of the three-way valve 6 through a third pipe fitting 10; a second end of the three-way valve 6 communicates with the radiator 1 through a fourth pipe 11. Lead to first pipe fitting 8, second pipe fitting 9, third pipe fitting 10 and fourth pipe fitting 11 and establish ties radiator 1, first pump body 2, galvanic pile 3 and three-way valve 6 in proper order and form a heat dissipation return circuit, this heat dissipation return circuit distributes reasonable simple structure.

In one embodiment, the first outlet port 42 of the heater 4 communicates with the first pipe 8 through the fifth pipe 12, and the first inlet port 41 of the heater 4 communicates with the second end of the three-way valve 6 through the sixth pipe 13. The first pipe fitting 8 and the heater 4 are communicated through a fifth pipe fitting 12, the first pump body 2, the galvanic pile 3 and the three-way valve 6 are respectively communicated through a second pipe fitting 9 and a third pipe fitting 10, and finally the three-way valve 6 and the heater 4 are communicated through a sixth pipe fitting 13 to form a heating loop. The heating loop is used for heating the electric pile 3, so that the electric pile 3 can quickly meet the starting requirement in a low-temperature environment.

In one embodiment, the second liquid outlet 51 of the converter 5 is communicated with the radiator 1 through the seventh pipe 14; the second liquid inlet 52 of the converter 5 is communicated with the liquid outlet of the second pump body 7 through an eighth pipe 15; the liquid inlet of the second pump body 7 is communicated with the radiator 1 through a ninth pipe fitting. The radiator 1, the converter 5 and the second pump body 7 are connected in series by a seventh pipe 14, an eighth pipe 15 and a ninth pipe to form a cooling circuit. The heat dissipation of the individual converters 5 is effected by means of a second heat dissipation circuit. The heat dissipation stability of the converter 5 is ensured.

In one embodiment, the heater 4 is fixedly connected to the converter 5, and the heater 4 is also disposed inside the converter 5. The heater 4 is arranged inside the converter 5, so that the space of the system can be saved, and the volume of the whole system can be reduced. The heater 4 is also electrically connected to the converter 5. The heater 4 is supplied with power from the inverter 5, and the length of the power supply line can also be shortened because the heater 4 is disposed inside the inverter 5.

In one embodiment, the heater 4 is externally provided with a thermal insulation layer. The heat insulation layer can effectively reduce the influence of the temperature of the heater 4 on components in the converter 5.

As shown in fig. 1 and 2, the working process of the invention is as follows: when the galvanic pile 3 needs cold start, the heating loop needs to be communicated, at the moment, the first end and the third end of the three-way valve 6 are communicated, and the second end is closed. The third pipe fitting 10 is communicated with the sixth pipe fitting 13, the first pump body 2 is started, the cooling liquid mass sequentially passes through the first pump body 2, the second pipe fitting 9, the galvanic pile 3, the third pipe fitting 10, the three-way valve 6, the sixth pipe fitting 13, the heater 4, the bottom five pipe fitting and the first pipe fitting 8, and finally flows back to the first pump body 2. The liquid is heated and heated when passing through the heater 4, and the heated liquid transfers heat to the galvanic pile 3 when flowing through the galvanic pile 3, so that the temperature of the galvanic pile 3 is heated and reaches the starting requirement, and the galvanic pile is started when the temperature of the galvanic pile 3 reaches the starting requirement.

In the working process of the galvanic pile 3, the heat generated by the galvanic pile 3 needs to be discharged to ensure that the working temperature of the galvanic pile 3 is stable. At this time, the heater 4 is not needed to provide a heat source, the heater 4 is turned off, the first end and the third end of the three-way valve 6 are communicated, the third pipe 10 and the fourth pipe 11 are communicated, the second end of the three-way valve 6 is turned off, so that the cooling liquid flows into the radiator 1, and the radiator 1 is started to radiate the cooling liquid in the radiator 1. The warmed coolant mass sequentially passes through the first pipe 8, the first pump body 2, the second pipe 9, the galvanic pile 3, the third pipe 10 and the three-way valve 6, and finally returns to the radiator 1 through the fourth pipe 11, so that the heat dissipation of the galvanic pile 3 is realized.

After the electric pile 3 is started, the converter 5 also enters a working state, the cooled cooling liquid in the radiator 1 is pumped out through the ninth pipe fitting 16 by the second pump body 7, and enters the eighth pipe fitting 15 and then enters the converter 5 after being pressurized by the second pump body 7, so that components inside the converter 5 are cooled, and then are discharged through the seventh pipe fitting 14 and enter the radiator 1 through the seventh pipe fitting 14 to be cooled, and a cooling loop is formed.

To sum up, the embodiment of the present invention provides a heat cycle system of a fuel cell, which can heat an electric stack 3 by setting a heating loop, so as to ensure the start requirement of the electric stack 3, and a heat sink respectively dissipates heat of the electric stack 3 and a converter 5. The stable working state of the electric pile 3 and the converter 5 is ensured, and meanwhile, the heater 4 is arranged inside the converter 5, so that the internal space of the converter 5 can be fully utilized, the volume of the system is reduced, the volume-to-power ratio of the system is improved, and the use of a wall-through connector and a high-voltage cable is reduced.

The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.

Claims

1. A heat cycle system of a fuel cell, comprising: the system comprises a heating loop, a heater, a first pump body, a galvanic pile, a three-way valve and a radiator, wherein the heating loop is used for cooling liquid to flow; the heater, the first pump body, the galvanic pile and the three-way valve are respectively and sequentially distributed along the heating loop; the liquid outlet of the radiator is communicated with the heating loop between the heater and the first pump body, and the liquid inlet of the radiator is communicated with the three-way valve.

2. The fuel cell thermal cycle system according to claim 1, further comprising: the cooling system comprises a converter, a cooling loop for flowing cooling liquid, and a second pump body; the radiator, the converter, and the second pump body are respectively disposed on the cooling circuit.

3. The fuel cell thermal cycle system of claim 2, wherein the converter is fixedly connected to the heater.

4. The fuel cell thermal cycle system of claim 3, wherein the converter has a receiving cavity therein; the heater is arranged in the accommodating cavity.

5. The fuel cell thermal cycle system of claim 1, wherein the three-way valve includes a first port, a second port, and a third port; the first port is communicated with the liquid outlet end of the galvanic pile, and the second end is communicated with the liquid inlet of the heater; the third end is communicated with a liquid inlet of the radiator.

6. A fuel cell thermal cycle system according to any one of claim 3, wherein the heater is also electrically connected to the converter.

7. The fuel cell thermal cycle system according to any one of claims 1 to 6, wherein the heater is externally provided with a heat insulating layer and a protective layer.