CN215493045U - High-low temperature circulation test system for proton exchange membrane fuel cell - Google Patents
High-low temperature circulation test system for proton exchange membrane fuel cell Download PDFInfo
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Abstract
The utility model relates to a high-low temperature cycle test system of a proton exchange membrane fuel cell, which comprises a low-temperature cycle impact structure and a high-temperature cycle impact structure which are mutually independent; the low-temperature circulating impact structure comprises a cold source, a cold source working channel and a cold source self-circulating channel, wherein the cold source is communicated with a to-be-tested piece through the cold source working channel to form a low-temperature circulating impact loop, and the cold source is communicated with the cold source self-circulating channel to form a low-temperature heat-preservation regulating loop; the high-temperature circulating impact structure comprises a heat source, a heat source working channel and a heat source self-circulating channel, wherein the heat source is communicated with a to-be-tested part through the heat source working channel to form a high-temperature circulating impact loop, and the heat source is communicated with the heat source self-circulating channel to form a high-temperature heat-preservation regulating loop; the cold source, the cold source working channel, the cold source self-circulation channel, the heat source working channel and the heat source self-circulation channel are all connected to the controller. Compared with the prior art, the method can rapidly switch heating and refrigerating, and realize rapid evaluation of the durability of the galvanic pile material and key components.
Description
Technical Field
The utility model relates to the technical field of proton exchange membrane fuel cell testing, in particular to a high-low temperature cycle testing system of a proton exchange membrane fuel cell.
Background
Proton Exchange Membrane Fuel Cells (PEMFC) have the advantages of high efficiency, low pollution and low noise, and have a very wide application range. Temperature is an important factor affecting PEMFC performance and lifetime metrics. The pile is in high temperature for a long time during normal operation, is in low temperature below zero during shutdown in winter, and is easy to have strength failure problems such as cold-heat fatigue, mechanical fatigue and creep deformation of the PEMFC under the state of rapid and large-range temperature change, thereby causing damage. Before the PEMFC is used, high-low temperature thermal shock endurance test investigation is carried out on key materials and parts of the PEMFC, and the PEMFC has important significance for improving the reliability and the service life of the whole galvanic pile.
Currently, a rapid thermal shock test method for PEMFCs has been studied at home and abroad, but no internationally recognized standard test method has been established. In China, no national standard for the thermal shock test of the PEMFC is established, and test methods and equipment are different. The current market is mainly applicable to thermostat equipment of motors and battery packs, and a high-low temperature rapid thermal shock cycle test system aiming at the PEMFC is lacked; and the impact frequency of the existing thermal shock experimental equipment is not high, so that the requirement of the industry on rapid evaluation of the sealing material and the structure can not be met.
The Chinese patent application CN109828176A provides a high and low temperature cycle test system for a motor battery of a new energy automobile, which mainly comprises a main control system and an execution test system, and can respectively perform high and low temperature cycle tests on the new energy automobile battery and the motor. However, the research of this application focuses on providing a high and low temperature circulation test system that is applicable to new energy automobile battery and motor simultaneously, and this system heats and refrigerates circulation liquid through setting up heating branch road and refrigeration branch road, realizes accurate control by temperature change, and this system can't realize high low temperature fast switch over, and the impact frequency is low.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the defects of the prior art and provide a high-low temperature cycle testing system for a proton exchange membrane fuel cell.
The purpose of the utility model can be realized by the following technical scheme:
a proton exchange membrane fuel cell high-low temperature cycle test system comprises a low-temperature cycle impact structure and a high-temperature cycle impact structure which are mutually independent;
the low-temperature circulating impact structure comprises a cold source, a cold source working channel and a cold source self-circulating channel, wherein the cold source is communicated with a to-be-tested piece through the cold source working channel to form a low-temperature circulating impact loop, and the cold source is also communicated with the cold source self-circulating channel to form a low-temperature heat-preservation regulating loop;
the high-temperature circulating impact structure comprises a heat source, a heat source working channel and a heat source self-circulating channel, wherein the heat source is communicated with a to-be-tested part through the heat source working channel to form a high-temperature circulating impact loop, and the heat source is also communicated with the heat source self-circulating channel to form a high-temperature heat-preservation regulating loop;
the cold source, the cold source working channel, the cold source self-circulation channel, the heat source working channel and the heat source self-circulation channel are all connected to the controller.
Preferably, the cold source working channel, the cold source self-circulation channel, the heat source working channel and the heat source self-circulation channel all comprise circulation pipelines for circulating cold and hot media.
Preferably, cold source working channel and heat source working channel in equally divide and be equipped with at least 2 solenoid valves that are used for controlling the working channel break-make that corresponds respectively, wherein 1 solenoid valve sets up in the cold of waiting to test the piece, hot medium entry end the place ahead at least, 1 solenoid valve sets up in the cold of waiting to test the piece, hot medium exit end rear at least, cold source working channel and heat source working channel in still be equipped with at least 1 check valve that is used for the restriction cold, hot medium circulation direction respectively, the check valve set up in the cold of waiting to test the piece, hot medium entry end the place ahead, the solenoid valve all be connected to the controller.
Preferably, the cold source self-circulation channel and the heat source self-circulation channel are respectively provided with at least 1 electromagnetic valve for controlling the on-off of the corresponding self-circulation channel and at least 1 one-way valve for limiting the circulation direction of the cold and heat media, and the electromagnetic valves are connected to the controller.
Preferably, the cold source working channel and the cold source self-circulation channel have their cold medium inlets and cold medium outlets respectively connected to the cold source through independent inlet communicating pipes and outlet communicating pipes, or the cold source working channel and the cold source self-circulation channel have their cold medium inlets and cold medium outlets connected to the cold source through shared inlet communicating pipes and outlet communicating pipes.
Preferably, the heat medium inlets and the heat medium outlets of the heat source working channel and the heat source self-circulation channel are respectively connected to the heat source through independent inlet communication pipelines and independent outlet communication pipelines, or the heat medium inlets and the heat medium outlets of the heat source working channel and the heat source self-circulation channel are connected to the heat source through shared inlet communication pipelines and shared outlet communication pipelines.
Preferably, the circulation pipeline is wrapped with a thermal insulation sleeve.
Preferably, the inlet communicating pipeline and the outlet communicating pipeline are also wrapped with insulating sleeves.
Preferably, a plurality of temperature measuring nodes are respectively arranged in the cold source working channel, the cold source self-circulation channel, the heat source working channel and the heat source self-circulation channel, each temperature measuring node is respectively provided with a temperature sensor, and the temperature sensors are connected to the controller.
Preferably, the controller comprises a PLC controller.
Compared with the prior art, the utility model has the following advantages:
(1) according to the utility model, the low-temperature cycle impact structure and the high-temperature cycle impact structure which are mutually independent are arranged, so that the simulation of a cold-heat cycle test environment at-30 ℃ to +95 ℃ can be realized under normal pressure, meanwhile, a cold-heat double-channel mode can be used for rapidly switching heating and refrigeration, one cold-heat cycle period can be as low as 40 seconds and is far lower than that of a related national standard test method, and therefore, the rapid evaluation of the durability of a galvanic pile material and key components can be realized;
(2) the low-temperature circulating impact structure and the high-temperature circulating impact structure are respectively provided with the working channel and the self-circulating channel, and the self-circulating channel can realize the temperature control of a cold source, so that the effective implementation of the quick cold and hot switching is ensured;
(3) the cold source working channel and the cold source self-circulation channel can be arranged into independent loops which are independently communicated with the cold source, and can also be arranged into independent loops which are communicated with the cold source through a shared inlet communicating pipeline and an outlet communicating pipeline;
(4) each node of the whole system is automatically controlled, so that an accurate temperature control effect can be achieved, and the temperature error is within 0.5 ℃;
(5) the test piece is a normal single cell and a normal pile which can generate electricity, the cooling liquid passage of the test piece is fully utilized as a passage of a cooling medium and a heating medium, a special clamp and a special passage are not required to be designed, the test piece is convenient to use, and the effect is direct;
(6) the system has simple structure, reasonable design and convenient control, and can efficiently meet the requirements of high and low temperature cycle tests of the PEMFC.
Drawings
Fig. 1 is a schematic structural diagram of a high-low temperature cycle testing system of a proton exchange membrane fuel cell in example 1;
FIG. 2 is a high and low temperature impact cycling temperature curve diagram of a high and low temperature cycling test system of a PEM fuel cell in example 1;
fig. 3 is a schematic structural diagram of a high-low temperature cycle testing system of a proton exchange membrane fuel cell in example 2;
fig. 4 is a schematic structural diagram of a high-low temperature cycle testing system of a proton exchange membrane fuel cell in example 3; in the figure, 1 is a cold source, 2 is a first electromagnetic valve, 3 is a first check valve, 4 is a second electromagnetic valve, 5 is a third electromagnetic valve, 6 is a second check valve, 7 is a to-be-tested piece, 8 is a fourth electromagnetic valve, 9 is a third check valve, 10 is a fifth electromagnetic valve, 11 is a fourth check valve, 12 is a sixth electromagnetic valve, 13 is a heat source, 141, 142, 143, 144, 145 and 146 are inlet communicating pipelines, 151, 152, 153, 154, 155 and 156 are outlet communicating pipelines, 16 is a controller, 17 is an upper computer, 18 is a human-computer interface, 19 is a safety early warning system, and 201 and 202 are driving pumps.
Detailed Description
The utility model is described in detail below with reference to the figures and specific embodiments. Note that the following description of the embodiments is merely a substantial example, and the present invention is not intended to be limited to the application or the use thereof, and is not limited to the following embodiments.
Example 1
As shown in fig. 1, the present embodiment provides a high-low temperature cycle testing system for a proton exchange membrane fuel cell, which includes a low-temperature cycle impact structure and a high-temperature cycle impact structure that are independent of each other;
the low-temperature circulating impact structure comprises a cold source 1, a cold source working channel and a cold source self-circulating channel, wherein the cold source 1 is communicated with a to-be-tested piece through the cold source working channel to form a low-temperature circulating impact loop, and the cold source 1 is also communicated with the cold source self-circulating channel to form a low-temperature heat-preservation regulating loop;
the high-temperature circulating impact structure comprises a heat source 13, a heat source working channel and a heat source self-circulating channel, wherein the heat source 13 is communicated with a to-be-tested part through the heat source working channel to form a high-temperature circulating impact loop, and the heat source 13 is also communicated with the heat source self-circulating channel to form a high-temperature heat-preservation regulating loop;
the cold source 1, the cold source working channel, the cold source self-circulation channel, the heat source 13, the heat source working channel and the heat source self-circulation channel are all connected to the controller 16, and the controller 16 comprises a PLC (programmable logic controller).
In the embodiment, the to-be-tested parts are monocells and galvanic piles which can normally generate electricity, the cooling liquid passage of the to-be-tested parts is fully utilized as a passage of a cooling medium and a heating medium, and special fixtures and passages are not required to be designed; convenient use and direct effect.
The cold source working channel, the cold source self-circulation channel, the heat source working channel and the heat source self-circulation channel all comprise circulation pipelines for circulating cold and heat media.
Equally divide and do not be equipped with 2 at least solenoid valves that are used for controlling the working channel break-make that correspond in cold source working channel and the heat source working channel, wherein 1 at least solenoid valve sets up in the cold of waiting to test the piece, hot medium entry end the place ahead, 1 at least solenoid valve sets up in the cold of waiting to test the piece, hot medium exit end rear, still be equipped with 1 at least check valve that is used for the limit refrigeration respectively in cold source working channel and the heat source working channel, hot medium circulation direction, the check valve sets up in the cold of waiting to test the piece, hot medium entry end the place ahead, the solenoid valve all is connected to controller 16. The cold source self-circulation channel and the heat source self-circulation channel are respectively provided with at least 1 electromagnetic valve for controlling the on-off of the corresponding self-circulation channel and at least 1 one-way valve for limiting the circulation direction of the cold and heat media, and the electromagnetic valves are connected to the controller 16. In this embodiment, the cold source self-circulation channel is provided with 1 electromagnetic valve and 1 one-way valve, which are respectively a first electromagnetic valve 2 and a first one-way valve 3, the cold source working channel is provided with 2 electromagnetic valves and 1 one-way valve, which are respectively a second electromagnetic valve 4, a third electromagnetic valve 5 and a second one-way valve 6, the heat source self-circulation channel is provided with 1 electromagnetic valve and 1 one-way valve, which are respectively a fifth electromagnetic valve 10 and a fourth one-way valve 11, and the heat source working channel is provided with 2 electromagnetic valves and 1 one-way valve, which are respectively a fourth electromagnetic valve 8, a sixth electromagnetic valve 12 and a third one-way valve 9.
Cold source working channel and cold source are from circulation channel's cold medium entry and cold medium export through independent entry intercommunication pipeline and export intercommunication pipeline respectively and are connected to cold source 1, perhaps, cold source working channel and cold source are from circulation channel's cold medium entry and cold medium export and are connected to cold source 1 through shared entry intercommunication pipeline and export intercommunication pipeline. The heat medium inlets and heat medium outlets of the heat source working channel and the heat source self-circulation channel are respectively connected to the heat source 13 through independent inlet communicating pipelines and outlet communicating pipelines, or the heat medium inlets and heat medium outlets of the heat source working channel and the heat source self-circulation channel are connected to the heat source 13 through shared inlet communicating pipelines and outlet communicating pipelines. In the present embodiment, the inlet communicating pipe 141 and the outlet communicating pipe 151 are shared on the cold source side, and the inlet communicating pipe 142 and the outlet communicating pipe 152 are shared on the heat source side, so that the cold medium inlets of the cold source working channel and the cold source self-circulation channel are communicated to the cold source 1 through the shared inlet communicating pipe 141, the cold medium outlets of the cold source working channel and the cold source self-circulation channel are connected to the cold source 1 through the shared outlet communicating pipe 151, the hot medium inlets of the heat source working channel and the heat source self-circulation channel are communicated to the heat source 13 through the shared inlet communicating pipe 142, and the hot medium outlets of the heat source working channel and the heat source self-circulation channel are connected to the heat source 13 through the shared outlet communicating pipe 152. The circulation pipelines, the inlet communicating pipelines 141 and 142 and the outlet communicating pipelines 151 and 152 are all wrapped with insulation sleeves.
A plurality of temperature measuring nodes are respectively arranged in the cold source working channel, the cold source self-circulation channel, the heat source working channel and the heat source self-circulation channel, each temperature measuring node is respectively provided with a temperature sensor, and the temperature sensors are connected to the controller 16. Therefore, automatic temperature control of all nodes of the whole system is realized, accurate temperature control effect can be achieved, and temperature error is within 0.5 ℃.
In addition, the system controller 16 is also connected with an upper computer 17, a human-computer interaction interface 18 and a safety early warning system 19, wherein the upper computer 17 can realize remote monitoring, the human-computer interaction interface 18 can realize setting and checking of system operation data and the like, the safety early warning system 19 can receive and analyze the system operation data, can realize safety protection functions of overheat protection, high-low pressure protection, water tank liquid level early warning, abnormal early warning of the set temperature which is not reached and the like of the heat source 13, and is also provided with an emergency stop switch for operating a manual emergency device.
The specific working process of the high-low temperature cycle test system of the proton exchange membrane fuel cell in the embodiment is as follows:
the cold source 1 includes a driving pump capable of driving the circulation fluid to flow therein, and the heat source 13 includes a driving pump capable of driving the circulation fluid to flow therein.
When the cold source 1 works, the first electromagnetic valve 2 is closed, the second electromagnetic valve 4 and the third electromagnetic valve 5 are opened, and the circulating liquid serving as a cold medium returns to the cold source 1 after passing through the PEMFC stack through a working channel controlled by the second electromagnetic valve 4 and the third electromagnetic valve 5; at this time, the heat source 13 is in a self-circulation working state, the fifth electromagnetic valve 10 is opened, the fourth electromagnetic valve 8 and the sixth electromagnetic valve 12 are closed, and the circulating liquid returns to the heat source 13 through a self-circulation passage controlled by the fifth electromagnetic valve 10.
When the heat source 13 works, the fifth electromagnetic valve 10 is closed, the fourth electromagnetic valve 8 and the sixth electromagnetic valve 12 are opened, and the circulating liquid serving as a heat medium returns to the heat source 13 after passing through the PEMFC stack through a working channel controlled by the fourth electromagnetic valve 8 and the sixth electromagnetic valve 12; at this time, the cold source 1 is in a self-circulation working state, the first electromagnetic valve 2 is opened, the second electromagnetic valve 4 and the third electromagnetic valve 5 are closed, and the circulating liquid returns to the cold source 1 through a self-circulation channel controlled by the first electromagnetic valve 2.
By optimizing the length of the system pipeline and the design of the heat insulation sleeves on the pipelines, the system can perform high-low temperature circulating impact of minus 26-86 ℃ on the single cells. The impact frequency of the high temperature and the low temperature are both 20 seconds, the duration of a complete high-low temperature impact cycle is 40 seconds, and the cycle temperature diagram is shown in FIG. 2. By further optimizing the system heat insulation structure, the simulation of a cold-hot circulation test environment at minus 30 ℃ to plus 95 ℃ can be realized under normal pressure, meanwhile, the heating and refrigerating switching can be rapidly carried out in a cold-hot double-channel mode, one cold-hot circulation period can be as low as 40 seconds and is far lower than that of a related national standard test method, and therefore, the rapid evaluation of the durability of the galvanic pile material and key components can be realized.
Example 2
As shown in fig. 3, the present embodiment provides a high and low temperature cycling test system for a proton exchange membrane fuel cell, which is substantially the same as that of embodiment 1.
The difference lies in that: in the embodiment 1, the cooling source 1 includes a driving pump capable of driving the circulation fluid to flow therein. The heat source 13 includes a drive pump capable of driving the circulation liquid to flow therein. In embodiment 2, the low-temperature circulation impact structure includes a driving pump 201, and the driving pump 201 is installed in the inlet connection channel 141 of the low-temperature circulation impact structure; the high temperature cycle impingement structure includes a drive pump 202, and the drive pump 202 is installed at the inlet connection channel 142 of the low temperature cycle impingement structure.
When the cold source 1 works, the first electromagnetic valve 2 is closed, the second electromagnetic valve 4 and the third electromagnetic valve 5 are opened, and circulating liquid returns to the cold source 1 after passing through the PEMFC battery stack through a working channel controlled by the second electromagnetic valve 4 and the third electromagnetic valve 5; at this time, the heat source 13 is in a self-circulation working state, the fifth electromagnetic valve 10 is opened, the fourth electromagnetic valve 8 and the sixth electromagnetic valve 12 are closed, and the high-temperature circulating liquid returns to the heat source 13 through a self-circulation channel controlled by the fifth electromagnetic valve 10.
When the heat source 13 works, the fifth electromagnetic valve 10 is closed, the fourth electromagnetic valve 8 and the sixth electromagnetic valve 12 are opened, and the circulating liquid returns to the heat source 13 after passing through the PEMFC stack through the working channels controlled by the fourth electromagnetic valve 8 and the sixth electromagnetic valve 12; at this time, the cold source 1 is in a self-circulation working state, the first electromagnetic valve 2 is opened, the second electromagnetic valve 4 and the third electromagnetic valve 5 are closed, and the circulating liquid returns to the cold source 1 through a self-circulation channel controlled by the first electromagnetic valve 2.
Example 3
As shown in fig. 4, the present embodiment provides a high and low temperature cycling test system for a proton exchange membrane fuel cell, which is substantially the same as that of embodiment 1.
The difference lies in that: the cold source working channel and the cold source self-circulation channel are connected with the cold source 1 through independent inlet communicating pipelines and independent outlet communicating pipelines respectively, and the heat source working channel and the heat source self-circulation channel are connected with the heat source 13 through independent inlet communicating pipelines and independent outlet communicating pipelines respectively. Specifically, as shown in fig. 3, a cold medium inlet of the cold source working channel is communicated with the cold source 1 through an inlet communicating pipe 143, a cold medium inlet of the cold source self-circulation channel is communicated with the cold source 1 through an inlet communicating pipe 144, a cold medium outlet of the cold source working channel is communicated with the cold source 1 through an outlet communicating pipe 153, a cold medium outlet of the cold source self-circulation channel is communicated with the cold source 1 through an outlet communicating pipe 154, a hot medium inlet of the hot source working channel is communicated with the hot source 13 through an inlet communicating pipe 145, a hot medium inlet of the hot source self-circulation channel is communicated with the hot source 13 through an inlet communicating pipe 146, a hot medium outlet of the hot source working channel is communicated with the hot source 13 through an outlet communicating pipe 155, and a hot medium outlet of the hot source self-circulation channel is communicated with the hot source 13 through an outlet communicating pipe 156. As in example 1, the cooling source 1 includes a driving pump capable of driving the circulation fluid to flow therein, and the heating source 13 includes a driving pump capable of driving the circulation fluid to flow therein. Thermal insulation sleeves are wrapped on the flow pipelines, the inlet communicating pipelines 143, 144, 145 and 146 and the outlet communicating pipelines 153, 154, 155 and 156. Except for the above differences, the rest of the high and low temperature cycle testing system for the proton exchange membrane fuel cell provided in this embodiment is the same as that in embodiment 1, and the specific working process of performing the high and low temperature cycle test by using the high and low temperature cycle testing system for the proton exchange membrane fuel cell in this embodiment is also the same as that in embodiment 1, and is not repeated in this embodiment.
The above embodiments are merely examples and do not limit the scope of the present invention. These embodiments may be implemented in other various manners, and various omissions, substitutions, and changes may be made without departing from the technical spirit of the present invention.
Claims (10)
1. A high-low temperature cycle test system of a proton exchange membrane fuel cell is characterized in that the system comprises a low-temperature cycle impact structure and a high-temperature cycle impact structure which are mutually independent;
the low-temperature circulating impact structure comprises a cold source (1), a cold source working channel and a cold source self-circulating channel, wherein the cold source (1) is communicated with a to-be-tested piece through the cold source working channel to form a low-temperature circulating impact loop, and the cold source (1) is also communicated with the cold source self-circulating channel to form a low-temperature heat-preservation regulating loop;
the high-temperature circulating impact structure comprises a heat source (13), a heat source working channel and a heat source self-circulating channel, wherein the heat source (13) is communicated with a to-be-tested part through the heat source working channel to form a high-temperature circulating impact loop, and the heat source (13) is also communicated with the heat source self-circulating channel to form a high-temperature heat-preservation regulating loop;
the cold source (1), the cold source working channel, the cold source self-circulation channel, the heat source (13), the heat source working channel and the heat source self-circulation channel are all connected to the controller (16).
2. The system of claim 1, wherein the cold source working channel, the cold source self-circulation channel, the heat source working channel, and the heat source self-circulation channel each comprise a flow channel for flowing a cold medium and a heat medium.
3. The high and low temperature circulation testing system of a proton exchange membrane fuel cell according to claim 1, wherein the cold source working channel and the heat source working channel are respectively provided with at least 2 electromagnetic valves for controlling the on-off of the corresponding working channel, wherein at least 1 electromagnetic valve is arranged in front of the cold and hot medium inlet ends of the piece to be tested, at least 1 electromagnetic valve is arranged behind the cold and hot medium outlet ends of the piece to be tested, the cold source working channel and the heat source working channel are respectively provided with at least 1 one-way valve for limiting the flow direction of the cold and hot media, the one-way valve is arranged in front of the cold and hot medium inlet ends of the piece to be tested, and the electromagnetic valves are connected to the controller (16).
4. The high and low temperature circulation test system for the proton exchange membrane fuel cell according to claim 1, wherein at least 1 electromagnetic valve for controlling the on/off of the corresponding self-circulation channel and at least 1 one-way valve for limiting the circulation direction of the cooling and heating media are respectively arranged in the cold source self-circulation channel and the heat source self-circulation channel, and the electromagnetic valves are both connected to the controller (16).
5. The high and low temperature circulation test system of the proton exchange membrane fuel cell according to claim 1, wherein the cold medium inlet and the cold medium outlet of the cold source working channel and the cold source self-circulation channel are respectively connected to the cold source (1) through an independent inlet communicating pipeline and an independent outlet communicating pipeline, or the cold medium inlet and the cold medium outlet of the cold source working channel and the cold source self-circulation channel are connected to the cold source (1) through a shared inlet communicating pipeline and an outlet communicating pipeline.
6. The high and low temperature cycle testing system of the proton exchange membrane fuel cell according to claim 1, wherein the heat medium inlets and the heat medium outlets of the heat source working channel and the heat source self-circulation channel are respectively connected to the heat source (13) through independent inlet communication pipelines and independent outlet communication pipelines, or the heat medium inlets and the heat medium outlets of the heat source working channel and the heat source self-circulation channel are connected to the heat source (13) through a shared inlet communication pipeline and a shared outlet communication pipeline.
7. The high and low temperature cycle test system of proton exchange membrane fuel cell according to claim 2, wherein the flow pipe is wrapped with a thermal sleeve.
8. The high and low temperature cycle testing system of proton exchange membrane fuel cell according to claim 5 or 6, wherein the inlet communicating pipe and the outlet communicating pipe are wrapped with thermal sleeves.
9. The high and low temperature circulation test system for the proton exchange membrane fuel cell according to claim 1, wherein a plurality of temperature measurement nodes are respectively arranged in the cold source working channel, the cold source self-circulation channel, the heat source working channel and the heat source self-circulation channel, each temperature measurement node is respectively provided with a temperature sensor, and the temperature sensors are connected to the controller (16).
10. The pem fuel cell high-low temperature cycle testing system of claim 1, wherein said controller (16) comprises a PLC controller.
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