CN216054824U - Fuel cell cold start system with two pumps driving liquid magnetic heat flow - Google Patents
Fuel cell cold start system with two pumps driving liquid magnetic heat flow Download PDFInfo
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- CN216054824U CN216054824U CN202122290771.7U CN202122290771U CN216054824U CN 216054824 U CN216054824 U CN 216054824U CN 202122290771 U CN202122290771 U CN 202122290771U CN 216054824 U CN216054824 U CN 216054824U
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Abstract
A fuel cell cold start system with two pumps driving liquid magnetic heat flow is communicated with a fuel cell stack through a fuel cell heat management unit, a cooling loop and a magnetic working medium loop are arranged in the fuel cell heat management unit, a heat management controller is electrically connected with a first circulating pump, a first radiator, a three-way electromagnetic valve, a first temperature sensor and a second temperature sensor in the cooling loop, and the second circulating pump, the second radiator and the third temperature sensor in the magnetic working medium loop are electrically connected, the magnetic heat effect of the magnetic material is utilized to realize the cold start of the fuel cell by constructing magnetization heat release → demagnetization heat absorption → magnetization heat release in a low-temperature environment, and the heat in the environment is transferred to the fuel cell stack circularly, so that the energy consumption is low, the utilization rate and the endurance mileage of the fuel cell are improved, and the irreversible loss of the electrochemical active area caused by the separation of platinum and an ionic resin interface due to the melting of ice is avoided.
Description
Technical Field
The utility model belongs to the technical field of fuel cells, and relates to a fuel cell cold start system with two pumps driving liquid magnetic heat flow.
Background
The large-scale commercialization of fuel cell vehicles, which is one of the solutions for motorization of vehicles, also has problems of high cost, short life, weak hydrogen infrastructure, and the like. Among them, the cold start problem of fuel cell is one of the key technical bottlenecks that hinder the commercialization of fuel cell, and is the biggest challenge in the winter operation of fuel cell vehicles.
When the fuel cell is started in a low-temperature environment lower than 0 ℃ without taking any protective measures, water generated by the reaction can be frozen in the catalytic layer firstly, so that the reactive active sites of the catalytic layer are covered, oxygen transmission is blocked, and the voltage drops suddenly; when the catalytic layer is completely covered with ice and the temperature of the stack has not risen above 0 ℃, ice may form in the diffusion layer and the flow channels, resulting in a failed cold start. On the other hand, the icing process of the catalyst layer can cause gaps between the catalyst layer and the proton exchange membrane, and meanwhile, the icing/melting cycle can cause the collapse and densification of the microporous structure of the catalyst layer and the coarsening of platinum particles in the catalyst layer, so that the electrochemical active surface area is reduced and difficult to recover, thereby causing permanent damage to the power generation performance of the fuel cell, and the damage to the cell is larger when the cold start temperature is lower as the cycle times are larger.
At present, the technical scheme of cold start of a fuel cell is mainly that gas purging is utilized to reduce the water content of a membrane electrode of the fuel cell when a galvanic pile is stopped, so that the formation of solid ice is reduced, but when the temperature of the galvanic pile is not raised to be higher than 0 ℃, the galvanic pile is started to generate water to be frozen, ice is generated at the contact part of the surface of platinum particles and ion resin, once the temperature is raised to be room temperature, the ice on the interface of platinum and the ion resin is melted, so that the interface is separated, and irreversible electrochemical active area loss is caused.
Disclosure of Invention
The utility model aims to solve the technical problem of providing a fuel cell cold start system for driving liquid magnetic heat flow by two pumps, which adopts a fuel cell thermal management unit to be communicated with a fuel cell stack, a cooling loop and a magnetic working medium loop are arranged in the fuel cell thermal management unit, a thermal management controller is electrically connected with a first circulating pump, a first radiator, a three-way electromagnetic valve, a first temperature sensor and a second temperature sensor in the cooling loop and is electrically connected with a second circulating pump, a second radiator and a third temperature sensor in the magnetic working medium loop, and the heat in the environment is transferred to the fuel cell stack by circulation through constructing magnetization heat release → demagnetization heat absorption → magnetization heat release by utilizing the magnetocaloric effect of a magnetic material to realize the cold start of the fuel cell, so that the cold start system is low in energy consumption, is beneficial to improving the utilization rate and the endurance mileage of the fuel cell, and avoids the loss of electrochemical active area caused by the separation of platinum and an ionic resin interface due to ice melting.
In order to solve the technical problems, the technical scheme adopted by the utility model is as follows: the utility model provides a two pumps drive fuel cell cold start-up system of liquid magnetism thermal current, it includes fuel cell galvanic pile, fuel cell thermal management unit and thermal management controller, fuel cell thermal management unit's cooling circuit and fuel cell galvanic pile intercommunication, the magnetism hot current heat exchanger in the magnetic working medium return circuit is established ties in cooling circuit, thermal management controller and first circulating pump, first radiator, three-way solenoid valve, first temperature sensor and the second temperature sensor electric connection in the cooling circuit to and second circulating pump, second radiator and the third temperature sensor electric connection in the magnetic working medium return circuit.
And the cooling loop is sequentially connected with a permanent magnet, a first radiator and a three-way electromagnetic valve in series.
The magnetocaloric heat exchanger is located in a magnetic field cavity of the permanent magnet.
A first temperature sensor is arranged on a branch of one side of the first radiator communicated with the fuel cell stack; the other side of the first radiator is communicated with a branch of the fuel cell stack and communicated with a three-way electromagnetic valve, and a first circulating pump and a second temperature sensor are sequentially arranged on the branch.
The magnetic heat exchanger comprises a magnetic heat exchanger shell, a heat preservation layer, a liquid magnetic mass heat storage pipe and a cooling liquid heat exchange pipe; the space between the shell of the magnetic heat flow heat exchanger and the outer wall of the liquid magnetic heat storage tube is filled with heat insulation materials to form the heat insulation layer; a cavity between the inner wall of the liquid magnetic heat storage tube and the outer wall of the cooling liquid heat exchange tube is a flow channel of liquid magnetic substances; and a cooling liquid inlet and a cooling liquid outlet at two ends of the cooling liquid heat exchange tube are communicated with the cooling loop.
And the liquid magnetic material liquid inlet pipe and the liquid magnetic material liquid outlet pipe at two ends of the liquid magnetic material flow channel are communicated with the magnetic working medium loop.
And fins parallel to the axis are connected to the outer wall of the cooling liquid heat exchange tube of the magnetic heat flow heat exchanger.
The fins are radially arranged and extend to the inner wall of the liquid magnetic heat storage tube and are in contact with the liquid magnetic heat storage tube.
The heat insulating layer of the magnetic heat flow heat exchanger is a vacuum layer, and the heat insulating material filled in the heat insulating layer is a silicon dioxide nanometer micropore heat insulating material.
The utility model has the main beneficial effects that:
the cold start of the fuel cell is realized by utilizing the magnetocaloric effect of the magnetic material to construct a magnetization heat release → demagnetization heat absorption → a magnetization heat release cycle to transfer the heat in the environment to the fuel cell stack.
The fuel cell thermal management unit is used for controlling the working temperature of the fuel cell stack, and before cold start, the liquid magnetic substance flow enters the magnetic heat flow heat exchanger, and the magnetization heat released in the magnetic field formed by the permanent magnet preheats the fuel cell stack.
The outer wall of the cooling liquid heat exchange tube is connected with fins parallel to the axis of the cooling liquid heat exchange tube to enhance the heat conduction between the cooling liquid and the liquid magnetic substance, and the fins radially extend to the inner wall of the liquid magnetic substance heat storage tube and are in close contact with the inner wall of the liquid magnetic substance heat storage tube to provide mechanical support for the liquid magnetic substance heat storage tube.
And a PWM control mechanism is used for sending pulse width modulation signals to regulate and control the rotating speed of a circulating pump motor and a radiator fan motor, so that the fuel cell stack is continuously supplied with heat and heated to the starting temperature according with the fuel cell.
Drawings
The utility model is further illustrated by the following examples in conjunction with the accompanying drawings:
FIG. 1 is a system diagram of the present invention.
Fig. 2 is a schematic view showing the internal structure of the magnetocaloric heat exchanger according to the present invention.
FIG. 3 is a schematic cross-sectional view of the magnetocaloric heat exchanger according to the utility model at the inlet of the liquid magnetic mass.
Fig. 4 is a schematic cross-sectional view of a central portion of a magnetocaloric heat exchanger according to the present invention.
Fig. 5 is a schematic cross-sectional view of the liquid magnetic substance outlet of the magnetic heat flow heat exchanger of the present invention.
Fig. 6 is a schematic structural view of a coolant heat exchange tube of the magneto-caloric heat exchanger of the present invention.
In the figure: the fuel cell stack 1, the fuel cell thermal management unit 2, the first circulation pump 201, the second circulation pump 202, the permanent magnet 203, the magnetocaloric heat exchanger 204, the magnetocaloric heat exchanger shell 2041, the insulating layer 2042, the liquid magnetic heat storage pipe 2043, the coolant heat exchange pipe 2044, the fins 2045, the coolant inlet 2046, the coolant outlet 2047, the liquid magnetic liquid inlet pipe 2048, the liquid magnetic liquid outlet pipe 2049, the first radiator 205, the second radiator 206, the three-way electromagnetic valve 207, the first temperature sensor 208, the second temperature sensor 209, the third temperature sensor 210, and the thermal management controller 3.
Detailed Description
As shown in fig. 1 to 6, a fuel cell cold start system using two pumps to drive liquid magnetic heat flow includes a fuel cell stack 1, a fuel cell thermal management unit 2, and a thermal management controller 3, where a cooling loop of the fuel cell thermal management unit 2 is communicated with the fuel cell stack 1, a magnetic heat exchanger 204 in the magnetic working medium loop is connected in series in the cooling loop, and the thermal management controller 3 is electrically connected to a first circulation pump 201, a first radiator 205, a three-way electromagnetic valve 207, a first temperature sensor 208, and a second temperature sensor 209 in the cooling loop, and is electrically connected to a second circulation pump 202, a second radiator 206, and a third temperature sensor 210 in the magnetic working medium loop. When the fuel cell is used, the magnetocaloric effect of the magnetic material is utilized to realize the cold start of the fuel cell by constructing magnetization heat release → demagnetization heat absorption → magnetization heat release in a low-temperature environment and circularly transferring heat in the environment to the fuel cell stack, so that the energy consumption is low, the utilization rate and the endurance mileage of the fuel cell are favorably improved, and the irreversible loss of the electrochemical active area caused by the separation of platinum and an ion resin interface due to ice melting is avoided.
Preferably, a first temperature sensor 208 is disposed at a coolant inlet of the fuel cell stack 1, a second temperature sensor 209 is disposed at a coolant outlet of the fuel cell stack 1, and the third temperature sensor 210 is disposed at a liquid magnetic mass outlet of the magnetocaloric heat exchanger 204.
In a preferred embodiment, the cooling circuit is connected in series with a permanent magnet 203, a first radiator 205 and a three-way electromagnetic valve 207 in sequence.
In a preferred embodiment, the magnetocaloric heat exchanger 204 is located in the magnetic field cavity of the permanent magnet 203.
In a preferred embodiment, a first temperature sensor 208 is disposed on a branch of the first heat sink 205 that communicates with the fuel cell stack 1; the other side of the first radiator 205 is communicated with a branch of the fuel cell stack 1, and the branch is communicated with a three-way electromagnetic valve 207, and a first circulating pump 201 and a second temperature sensor 209 are sequentially arranged on the branch.
Preferably, the first temperature sensor 208 and the second temperature sensor 209 are used for monitoring the temperature of the cooling liquid entering and exiting the fuel cell stack, respectively, and the third temperature sensor 210 is used for monitoring the temperature of the liquid magnetic substance exiting the magnetic heat flow heat exchanger 204.
Preferably, the fuel cell thermal management unit 2 is used to control the operating temperature of the fuel cell stack 1, and the magnetization heat released in the magnetic field formed by the permanent magnet 203 preheats the fuel cell stack 1 by using the liquid magnetic mass flow into the magnetic heat flux heat exchanger 204 before cold start.
Preferably, the thermal management controller 3 is configured to receive temperature signals of the coolant inlet and outlet of the fuel cell stack 1 and the liquid magnetic substance outlet of the magnetic heat exchanger 204 in the fuel cell thermal management unit 2, and send switching commands to the first circulation pump 201, the second circulation pump 202, the first radiator 205, the second radiator 206 and the three-way electromagnetic valve 207 in the fuel cell thermal management unit 2, so as to regulate and control the rotation speeds of the circulation pump motor and the radiator fan motor through a PWM control mechanism.
In a preferred embodiment, the magnetocaloric heat exchanger 204 includes a magnetocaloric heat exchanger housing 2041, an insulating layer 2042, a liquid magnetic mass heat storage tube 2043, and a cooling liquid heat exchange tube 2044; a space between the outer shell 2041 of the magnetocaloric heat exchanger and the outer wall of the liquid magnetic heat storage tube 2043 is filled with a heat insulating material to form the heat insulating layer 2042; a cavity between the inner wall of the liquid magnetic heat storage tube 2043 and the outer wall of the cooling liquid heat exchange tube 2044 is a flow channel of liquid magnetic substances; a coolant inlet 2046 and a coolant outlet 2047 at both ends of the coolant heat exchange tube 2044 communicate with the cooling circuit.
Preferably, the magnetocaloric heat exchanger 204 has a double pipe structure, and the coolant heat exchange pipe 2044 is a flow passage of the fuel cell stack coolant.
Preferably, the liquid magnetic substance is composed of magnetic powder and liquid base liquid.
Preferably, the magnetic powder is a magnetic material with the Curie temperature of 245-280K, and comprises but is not limited to Gd-Si-Ge, La-Fe-Si-C, La-Fe-Co-Al, La-Fe-Co-Si, La-Fe-Al-C, La-Fe-Al-H, La-Fe-Al-C-H, La-Pr-Fe-Co-Si, Mn-Fe-P-As, Mn-Cr-Co-Ge and other series alloy materials.
Preferably, the liquid base fluid is silicone oil.
In the preferred scheme, the liquid magnetic inlet pipe 2048 and the liquid magnetic outlet pipe 2049 at the two ends of the liquid magnetic flow channel are communicated with the magnetic working medium loop.
In a preferred embodiment, fins 2045 parallel to the axis are connected to the outer wall of the coolant heat exchange tubes 2044 of the magnetocaloric heat exchanger 204. In use, fins 2045 enhance heat transfer between the coolant and the liquid magnetic substance.
In a preferable scheme, the fins 2045 radially extend to and contact with the inner wall of the liquid magnetic heat storage tube 2043. When in use, the fins 2045 are radial and contact the liquid magnetic heat storage tube 2043 to provide mechanical support for the liquid magnetic heat storage tube 2043.
Preferably, the maximum length of the fins 2045 in the axial direction cannot exceed the distance between the tangents of the inner side walls of the liquid magnetic substance inlet pipe 2048 and the liquid outlet pipe 2049, so that the liquid magnetic substances are uniformly distributed in a cavity formed between the outer wall of the cooling liquid heat exchange pipe 2044 and the inner wall of the liquid magnetic substance heat storage pipe 2043.
In a preferred embodiment, the insulating layer 2042 of the magnetocaloric heat exchanger 204 is a vacuum layer, and the insulating material filled therein is a silica nano microporous insulating material. When in use, the silicon dioxide nanometer microporous heat-insulating material comprises gas-phase silicon dioxide, silicon dioxide aerogel and silicon dioxide obtained by a precipitation method, and is sealed in the vacuum heat-insulating layer 2042.
In particular, as shown in figure 1,
the outlet of the cooling liquid of the fuel cell stack 1 is connected with the liquid inlet of a first circulating pump 201 in the fuel cell thermal management unit 2 through a pipeline.
The liquid outlet of the first circulating pump 201 is connected with the liquid inlet of the three-way electromagnetic valve 207 through a pipeline; a first liquid outlet and a second liquid outlet of the three-way electromagnetic valve 207 are respectively connected with a liquid inlet of the first radiator 205 and a cooling liquid inlet 2046 of the magnetic heat flow heat exchanger 204 through pipelines; coolant inlet 2046 is shown in fig. 2.
The coolant outlet 2047 of the magnetic heat exchanger 204 and the liquid outlet of the first heat sink 205 are respectively connected to the coolant inlet of the fuel cell stack 1 through pipes, thereby forming a coolant circulation circuit of the fuel cell stack 1. Coolant outlet 2047 is shown in fig. 2.
A liquid outlet of the second circulation pump 202 is connected to a liquid magnetic substance inlet 2048 of the magnetocaloric heat exchanger 204 through a pipe, a liquid magnetic substance outlet 2049 of the magnetocaloric heat exchanger 204 is connected to a liquid inlet of the second heat sink 206 through a pipe, and a liquid outlet of the second heat sink 206 is connected to a liquid inlet of the second circulation pump 202 through a pipe, so as to form a liquid magnetic substance circulation loop. Liquid magnetic inlet 2048 is shown in figure 2.
Specifically, buffer tanks for constant-pressure fluid infusion are further connected to the inlet and outlet fluid pipelines of the first circulation pump 201 and the second circulation pump 202, respectively. The buffer tank is not shown in the figure.
Specifically, as shown in fig. 1, the thermal management controller 3 is connected to a first temperature sensor 208, a second temperature sensor 209, and a third temperature sensor 210 in the fuel cell thermal management unit 2 via low-voltage signal lines, and receives temperature signals from the temperature sensors.
And is connected with a three-way electromagnetic valve 207 in the fuel cell thermal management unit 2 through a low-voltage switch control line, and sends an instruction of the opening direction to the three-way electromagnetic valve.
The control system is connected with a first circulating pump 201, a second circulating pump 202, a first radiator 205 and a second radiator 206 in the fuel cell thermal management unit 2 through low-voltage switch control lines, and sends switching instructions to the circulating pump and the radiator fan and sends pulse width modulation signals to the circulating pump and the radiator fan through a PWM control mechanism so as to regulate and control the rotating speeds of a circulating pump motor and a radiator fan motor.
A fuel cell cold start system with two pumps driving liquid magnetic heat flow works in a cold start mode and a normal heat management mode:
example 1, in the cold start mode,
the thermal management controller 3 opens the second valve of the three-way electromagnetic valve 207 in the fuel cell thermal management unit 2, and then starts the first circulating pump 201 and the second circulating pump 202, respectively, so that the coolant path of the fuel cell stack 1 has the following operation tracks: the first circulation pump 201 → the three-way solenoid valve 207 → the magnetocaloric heat exchanger 204 → the fuel cell stack inlet front coolant temperature sensor 208 → the fuel cell stack 1 → the fuel cell stack outlet rear coolant temperature sensor 209 → the first circulation pump 201, thereby constituting a heat transfer fluid transfer circuit of the fuel cell stack;
the moving track of the liquid magnetic substance is as follows: the second circulation pump 202 → the magnetocaloric heat exchanger 204 → the third temperature sensor 210 → the second radiator 206 → the second circulation pump 202; in the process, when the liquid magnetic substance in the fuel cell thermal management unit 2 flows into the liquid magnetic substance heat storage tube 2043 of the magnetic heat flow heat exchanger 204, the liquid magnetic substance starts to be magnetized and release heat because of being in the magnetic field formed by the permanent magnet 203 and transfers the magnetized heat to the coolant in the coolant heat exchange tube 2044 through the coolant heat exchange tube 2044, the coolant flows into the fuel cell stack 1 under the driving of the first circulating pump 201 to transfer the magnetized heat to the stack, and the liquid magnetic substance completes demagnetization through heat exchange and absorption in the environment when flowing through the second radiator 206 and then enters the magnetic heat flow heat exchanger 204 again to be magnetized and release heat, and the circulation is performed so as to continuously supply heat to the fuel cell stack 1 and increase the temperature to meet the starting temperature of the fuel cell.
Example 2, in the normal thermal management mode, two different circulation paths exist for the coolant of the fuel cell stack 1, wherein,
when the fuel cell stack 1 has just finished low-temperature startup and has not reached the optimal operating temperature, the thermal management controller 3 turns off the second circulation pump 202 and the second radiator fan in the fuel cell thermal management unit 2, and keeps the second valves of the first circulation pump 201 and the three-way electromagnetic valve 207 in an open state, so that the coolant circulates according to the heat-carrying fluid transfer loop of the fuel cell stack.
When the fuel cell stack 1 has entered the optimal operating temperature range, the thermal management controller 3 opens the first valve of the three-way electromagnetic valve 207 in the fuel cell thermal management unit 2, so that the operation trajectory of the coolant circuit of the fuel cell stack 1 is as follows: the first circulation pump 201 → the three-way electromagnetic valve 207 → the first radiator 205 → the fuel cell stack inlet front coolant temperature sensor 208 → the fuel cell stack 1 → the fuel cell stack outlet rear coolant temperature sensor 209 → the first circulation pump 201, thereby constituting a heat transfer fluid transfer circuit of the fuel cell. In this process, the thermal management controller 3 sends pulse width modulation signals to the fans of the first circulating pump 201 and the first radiator 205 in the fuel cell thermal management unit 2 through a PWM control mechanism to regulate and control the rotation speeds of the circulating pump motor and the radiator fan motor to control the temperature of the fuel cell stack 1.
The thermal management controller 3 records the temperature of the coolant measured by the first temperature sensor 208 as TFiThe temperature of the coolant measured by the second temperature sensor 209 is denoted as TFoIn embodiment 1, the thermal management controller 3 employs TFiOr TFoAs a reference temperature of the fuel cell stack 1 for subsequent comparison and processing; in embodiment 2, the thermal management controller 3 employs TFiAnd TFoAs a parameter for subsequent comparison and processing. T in the above-described embodiment will be described belowFiOr/and TFoCollectively referred to as "fuel cell stack coolant temperature TF". And heating the third temperatureThe reference temperature of the temperature sensor 210 is referred to as the "liquid magnetic substance outlet temperature TM”。
In embodiment 1, the thermal management controller 3 reads the first threshold temperature T1A second threshold temperature T2Wherein the first threshold temperature T1Less than a second threshold temperature T2I.e. T1＜T2. Wherein the first threshold temperature T1Setting the temperature to be within the range of-4 ℃ to 0 ℃; second threshold temperature T2The temperature is set to be one of the ranges of 70 ℃ to 75 ℃, namely the optimal temperature for the normal operation of the fuel cell stack 1.
The thermal management controller 3 compares the fuel cell stack coolant temperature TFAnd a first threshold temperature T1. When T isF＜T1When the fuel cell is started, the thermal management system of the fuel cell enters a cold starting mode; when T isF＞T1And then, the fuel cell thermal management system enters a normal thermal management mode.
The utility model utilizes the magnetocaloric effect of the magnetic material to transfer the heat in the environment to the fuel cell stack to realize the cold start of the fuel cell by constructing the magnetization heat release → demagnetization heat absorption → magnetization heat release circulation in the low temperature environment, and has the advantage of low energy consumption compared with the conventional heat pump and the preheating modes of adopting electric heating or hydrogen catalytic combustion and the like, thereby improving the utilization rate of vehicle-mounted energy sources of the fuel cell automobile, such as the utilization rate of electric energy or hydrogen energy, and further prolonging the driving range of the fuel cell.
The above-described embodiments are merely preferred embodiments of the present invention, and should not be construed as limiting the present invention, and features in the embodiments and examples in the present application may be arbitrarily combined with each other without conflict. The protection scope of the present invention is defined by the claims, and includes equivalents of technical features of the claims. I.e., equivalent alterations and modifications within the scope hereof, are also intended to be within the scope of the utility model.
Claims (9)
1. A fuel cell cold start system of two pumps driving liquid magnetic heat flow is characterized in that: the system comprises a fuel cell thermal management unit (2) and a thermal management controller (3); the magnetic heat flow heat exchanger (204) in the magnetic working medium loop of the fuel cell heat management unit (2) is connected in series in the cooling loop, and the heat management controller (3) is electrically connected with a first circulating pump (201), a first radiator (205), a three-way electromagnetic valve (207), a first temperature sensor (208) and a second temperature sensor (209) in the cooling loop and is electrically connected with a second circulating pump (202), a second radiator (206) and a third temperature sensor (210) in the magnetic working medium loop.
2. The two-pump fuel cell cold start system for driving a flow of magnetic heat in a liquid state of claim 1, further comprising: the cooling loop is sequentially connected with a permanent magnet (203), a first radiator (205) and a three-way electromagnetic valve (207) in series.
3. The two-pump fuel cell cold start system for driving a flow of magnetic heat in a liquid state of claim 1, further comprising: the magnetocaloric heat exchanger (204) is located in a magnetic field cavity of the permanent magnet (203).
4. The two-pump fuel cell cold start system for driving a flow of magnetic heat in a liquid state of claim 1, further comprising: a first temperature sensor (208) is arranged on a branch of one side of the first radiator (205) communicated with the fuel cell stack (1); the other side of the first radiator (205) is communicated with a branch of the fuel cell stack (1) and communicated with a three-way electromagnetic valve (207), and a first circulating pump (201) and a second temperature sensor (209) are sequentially arranged on the branch.
5. The two-pump fuel cell cold start system for driving a flow of magnetic heat in a liquid state of claim 1, further comprising: the magnetocaloric heat exchanger (204) comprises a magnetocaloric heat exchanger shell (2041), an insulating layer (2042), a liquid magnetic mass heat storage pipe (2043) and a cooling liquid heat exchange pipe (2044); a space between the shell (2041) of the magnetic heat flow heat exchanger and the outer wall of the liquid magnetic heat storage pipe (2043) is filled with a heat insulating material to form the heat insulating layer (2042); a cavity between the inner wall of the liquid magnetic heat storage pipe (2043) and the outer wall of the cooling liquid heat exchange pipe (2044) is a flow channel of liquid magnetic substances; and a cooling liquid inlet (2046) and a cooling liquid outlet (2047) at two ends of the cooling liquid heat exchange tube (2044) are communicated with the cooling loop.
6. The two-pump fuel cell cold start system for driving a flow of magnetic heat in a liquid state of claim 5, further comprising: and the liquid magnetic material liquid inlet pipe (2048) and the liquid magnetic material liquid outlet pipe (2049) at two ends of the liquid magnetic material flow channel are communicated with the magnetic working medium loop.
7. The two-pump fuel cell cold start system for driving a flow of magnetic heat in a liquid state of claim 1, further comprising: and fins (2045) parallel to the axis are connected to the outer wall of a cooling liquid heat exchange tube (2044) of the magnetocaloric heat exchanger (204).
8. The two-pump fuel cell cold start system for driving a flow of magnetic heat in a liquid state of claim 7, further comprising: the fins (2045) are radially distributed and extend to the inner wall of the liquid magnetic substance heat storage pipe (2043) and are in contact with the liquid magnetic substance heat storage pipe.
9. The two-pump fuel cell cold start system for driving a flow of magnetic heat in a liquid state of claim 1, further comprising: the heat insulation layer (2042) of the magnetocaloric heat exchanger (204) is a vacuum layer, and the heat insulation material filled in the heat insulation layer is a silicon dioxide nanometer micropore heat insulation material.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202122290771.7U CN216054824U (en) | 2021-09-22 | 2021-09-22 | Fuel cell cold start system with two pumps driving liquid magnetic heat flow |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202122290771.7U CN216054824U (en) | 2021-09-22 | 2021-09-22 | Fuel cell cold start system with two pumps driving liquid magnetic heat flow |
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| CN202122290771.7U Active CN216054824U (en) | 2021-09-22 | 2021-09-22 | Fuel cell cold start system with two pumps driving liquid magnetic heat flow |
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