CN218974541U - Insulation detection device for proton exchange membrane fuel cell - Google Patents
Insulation detection device for proton exchange membrane fuel cell Download PDFInfo
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- 238000009413 insulation Methods 0.000 title claims abstract description 188
- 238000001514 detection method Methods 0.000 title claims abstract description 138
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- 238000012360 testing method Methods 0.000 claims abstract description 38
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- 230000002528 anti-freeze Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 239000008367 deionised water Substances 0.000 description 2
- 229910021641 deionized water Inorganic materials 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
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- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
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Abstract
The utility model provides an insulation detection device for a proton exchange membrane fuel cell, belongs to the technical field of fuel cell insulation detection, and solves the problem that the prior art cannot truly and safely and systematically perform insulation detection before delivery efficiently. The device comprises a test bench capable of mounting a fuel cell to be tested, a boosting DC-DC module, an electronic load, an insulation detector and a relay. The test bench is provided with a dry insulation detection control key capable of directly starting the fuel cell to be tested and a wet insulation detection control key capable of starting the fuel cell to be tested after filling cooling medium into the fuel cell to be tested. One path of the power supply output end of the fuel cell is connected with an electronic load after passing through the boosting DC-DC module, and the other path of the power supply output end of the fuel cell is respectively connected with the power supply end of the high-voltage power utilization component in the cell through a relay. The insulation detector is connected between the positive interface and the negative interface of the electronic load. The device has two functions of dry state detection and wet state insulation, and can perform safe, systematic and efficient tests on line.
Description
Technical Field
The utility model relates to the technical field of fuel cell insulation detection, in particular to an insulation detection device for a proton exchange membrane fuel cell.
Background
The proton exchange membrane fuel cell is a high-efficiency energy conversion device, has the advantages of environmental protection, low-temperature rapid start, high stable operation and the like, and is considered as an ideal power source for replacing an internal combustion engine. The stack is a heart of the fuel cell system, and the generated voltage is generally 200V or more, and the voltage is raised to 400V or more by the booster device, so that the stack is supplied to other parts of the fuel cell system and the whole vehicle for use. In order to prevent the electric shock of the users of the product and ensure the safety of the use environment, the insulation detection of the fuel cell is important.
When the insulation detection is performed on the fuel cell, insulation detection verification needs to be performed on high-voltage components in the system one by one, including high-voltage components such as PTC, an air compressor, a water pump and the like, see patent CN114734818A. However, the scheme is only suitable for the running scene of the fuel cell automobile, and the application scene of detection before delivery of the fuel cell is not considered. At present, most of detection before delivery is carried out through an insulation detector or a universal meter, high-voltage components still need to be detected one by a handheld tool of a worker, the process is complex, the efficiency is low, and certain safety risks exist. In addition, the influence of the conductivity of the cooling medium (antifreeze) on the fuel cell is not considered in the prior art, the electric leakage accident is easy to be caused due to high conductivity, metal ions are easy to be separated out from the cooling liquid flow channel in the operation process of the fuel cell, the conductivity is increased, the insulation detection result is influenced, and the insulation failure of the high-voltage part is easy to be misjudged.
Disclosure of Invention
In view of the above analysis, the present utility model aims to provide an insulation detection device for proton exchange membrane fuel cells, which is used for solving the problem that the insulation detection before delivery cannot be truly and effectively performed in the prior art.
In one aspect, the embodiment of the utility model provides an insulation detection device for a proton exchange membrane fuel cell, which comprises a test bench capable of mounting a fuel cell to be tested, a boost DC-DC module, an electronic load, an insulation detector and a plurality of relays which are independently controlled; wherein,,
the test bench is provided with a dry insulation detection control key for directly starting the fuel cell to be tested and a wet insulation detection control key for controlling the fuel cell to be tested to be started after the cooling cavity of the fuel cell to be tested is filled with cooling medium;
one path of the power supply output end of the fuel cell to be tested is connected with an electronic load after passing through the boosting DC-DC module, and the other path of the power supply output end of the fuel cell to be tested is connected with the power supply end of a corresponding high-voltage power utilization component in the fuel cell to be tested through an independently controlled relay respectively; the insulation detector is connected between the positive interface and the negative interface of the electronic load.
The beneficial effects of the technical scheme are as follows: the insulation detection is an indispensable item in the factory test, and by installing the insulation detector capable of detecting on line between the positive interface and the negative interface of the electronic load, the insulation resistance value of the fuel cell to be detected or the insulation resistance value of the high-voltage power utilization component in the test is monitored in real time, the insulation resistance value in the factory test is monitored on line, and potential safety hazards caused by the fact that workers hold tools to conduct contact inspection on the high-voltage component one by one are avoided. Meanwhile, the insulation detection function of the device comprises dry insulation detection, wet insulation detection and the like, and after the device has the online insulation detection capability, the dry insulation detection and the wet insulation detection can be optimized and integrated, so that the device is an online, safe, systematic and efficient insulation test device which can be used in a fuel cell test scene.
Based on the further improvement of the device, the high-voltage power utilization component comprises a PTC heater, an air compressor and a water pump in the fuel cell to be tested; wherein,,
the PTC heater and the water pump are connected in series and are arranged on a cooling liquid circulation pipeline of the fuel cell to be tested;
the air compressor is arranged on an air inlet pipeline of the fuel cell to be tested.
Further, the test bench is also integrated with a deionized tank for storing a cooling medium; wherein,,
the output end of the deionization tank is connected with a cooling cavity water filling port of the fuel cell to be tested; and a switch control valve is arranged on a pipeline between the output end of the deionizing tank and the water injection port of the cooling cavity of the fuel cell to be tested, and the control end of the switch control valve is electrically connected with a wet insulation detection control key.
Further, the insulation detection device further includes:
the water tank is arranged in the cooling liquid external circulation loop of the fuel cell to be tested on the test bench, and the input end of the water tank is connected with the output end of the ion tank and is used as a water filling port of a cooling cavity of the fuel cell to be tested;
and the exhaust valve is arranged at the top of the water tank and used for being synchronously started with the switch control valve.
Further, the insulation detection device further includes:
and the electrode of the conductivity detector extends into the cooling medium of the cooling liquid circulation loop of the fuel cell to be detected and is used for acquiring the conductivity of the cooling medium.
The insulation detection device further comprises an all-in-one controller which is used for starting a dry insulation detection control key firstly to directly start the fuel cell to be detected and perform dry insulation detection, collecting insulation detector data through controlling the closing of a corresponding relay to output as a dry insulation detection result, starting a wet insulation detection control key after confirming that the dry insulation detection result is normal, controlling an exhaust valve to be opened to perform water injection and exhaust, starting the fuel cell to be detected again to perform wet insulation detection, and collecting the insulation detector data through controlling the closing of the corresponding relay to serve as a wet insulation detection result; wherein,,
the input end of the all-in-one controller is connected with the insulation detector, and the output end of the all-in-one controller is connected with the control ends of the dry insulation detection control key, the wet insulation detection control key and the exhaust valve on the test bench.
Further, the insulation detection device also comprises an upper computer which is used for man-machine interaction, controls the test bench through the all-in-one controller and acquires data of the insulation detector; wherein,,
the data end of the upper computer is connected with the data end of the all-in-one controller, and the upper computer is provided with a display control panel.
Further, the all-in-one controller is provided with a display module; and the display screen of the display module displays a dry insulation detection result and a wet insulation detection result respectively.
Further, the insulation detector further comprises a first detection module and a second detection module; wherein,,
the first detection module is used for starting after all relays are closed and outputting an insulation resistance value of the whole system of the fuel cell to be detected;
and the second detection module is used for starting only when one relay is started, and outputting the insulation resistance value of the high-voltage power utilization component in the fuel cell to be detected corresponding to the relay.
Further, the insulation detection device also comprises a first pressure relief unit and a second pressure relief unit which are used for releasing residual charges in the high-voltage system of the fuel cell;
the first pressure relief unit and the second pressure relief unit comprise a discharge resistor and a discharge contactor which are sequentially connected in series;
one end of a discharge resistor in the first pressure relief unit is connected with the positive electrode of the power supply output end of the fuel cell to be tested, and one end of a discharge contactor is connected with the negative electrode of the power supply output end of the fuel cell to be tested and is grounded;
one end of the discharge resistor in the second pressure relief unit is connected with a positive input interface of the electronic load, and one end of the discharge contactor is connected with a negative input interface of the electronic load and is grounded.
Compared with the prior art, the utility model has at least one of the following beneficial effects:
1. the dry insulation detection, the warm-up, the water adding and exhausting, and the wet insulation detection processes are optimized and integrated, so that the safe, systematic and efficient insulation detection device for the fuel cell system is provided.
2. The insulation detection can be automatically carried out, the dry insulation detection is carried out firstly, then the wet insulation detection is carried out, the insulation resistance of the fuel cell system is detected in the dry state, the high-voltage component which is in insulation failure can be preliminarily removed, the threat to the personal safety of a user after water and air are added and exhausted is avoided, the insulation resistance of the fuel cell system is further detected in the wet state, and whether the electric leakage phenomenon exists in the fuel cell engine under the condition of adding the cooling medium can be judged.
3. Under the condition of ensuring that the conductivity of the cooling medium is qualified, the insulation resistance value in a wet state is monitored in real time, the wet insulation resistance value gradually decreases along with the decrease of bubbles, the insulation resistance value in the wet state is read after the stable value is reached, and the subsequent test is performed after the cooling medium is qualified, so that the effect of the subsequent test is ensured.
The summary is provided to introduce a selection of concepts in a simplified form that are further described below in the detailed description. This summary is not intended to identify key features or essential features of the disclosure, nor is it intended to be used to limit the scope of the disclosure.
Drawings
The foregoing and other objects, features and advantages of the disclosure will be apparent from the following more particular descriptions of exemplary embodiments of the disclosure as illustrated in the accompanying drawings wherein like reference numbers generally represent like parts throughout the exemplary embodiments of the disclosure.
FIG. 1 is a schematic diagram showing the constitution of an insulation detection device for a proton exchange membrane fuel cell according to example 1;
fig. 2 shows a schematic circuit connection diagram of an insulation detection device for proton exchange membrane fuel cell of embodiment 2.
Reference numerals:
1-a test bench; 2-a fuel cell to be measured; a 3-boost DC-DC module; 4-electronic load; 5-an insulation detector; 6-an all-in-one controller; 7-PTC heater;
8-a water pump; 9-an air compressor; 10-a deionization tank; 11-conductivity detector;
12. 13-PTC relay; 14. 15-a water pump relay; 16. 17-an air compressor relay; 18. 19-pile relay; r1 is a first discharge resistor; r2-a second discharge resistor; k1-a first discharge contactor; k2-second discharge contactor.
Detailed Description
Embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While embodiments of the present disclosure are illustrated in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
The term "comprising" and variations thereof as used herein means open ended, i.e., "including but not limited to. The term "or" means "and/or" unless specifically stated otherwise. The term "based on" means "based at least in part on". The terms "one example embodiment" and "one embodiment" mean "at least one example embodiment. The term "another embodiment" means "at least one additional embodiment". The terms "first," "second," and the like, may refer to different or the same object. Other explicit and implicit definitions are also possible below.
Example 1
In one embodiment of the utility model, an insulation detection device for a proton exchange membrane fuel cell is disclosed, as shown in fig. 1, and comprises a test bench capable of mounting a fuel cell to be tested, a boost DC-DC module, an electronic load, an insulation detector and a plurality of relays which are independently controlled.
The test bench is provided with a detection control key of the fuel cell to be tested, and the detection control key comprises a dry insulation detection control key and a wet insulation detection control key.
The dry state insulation detection control key is used for directly starting the fuel cell to be detected, namely, introducing hydrogen and air in a dry state (in a state of not filling water), and has no functions of warming up, filling water (filling cooling medium) and exhausting, namely, has the dry state insulation detection function.
The wet insulation detection control key is used for controlling to firstly fill cooling medium into the cooling cavity of the fuel cell to be detected, then starting the fuel cell to be detected, namely, filling hydrogen and air, and has the water injection (cooling medium filling) function, namely, the wet insulation detection function.
One path of the power supply output end of the fuel cell to be tested is connected with an electronic load after passing through the boosting DC-DC module, and the other path of the power supply output end of the fuel cell to be tested is connected with the power supply end of a corresponding high-voltage power utilization component in the fuel cell to be tested through an independently controlled relay.
The insulation detector is connected between the positive interface and the negative interface of the electronic load and is used for acquiring and displaying the insulation resistance of each high-voltage electricity utilization component in the fuel cell to be tested after starting (namely, only the relay corresponding to the electric equipment is closed, and other relays are opened), or the insulation resistance value of the whole system of the fuel cell to be tested (all relays are closed). For specific structures of the insulation detector, see prior patents CN201921168691.0, CN202210927671.7 and the like.
When the method is implemented, the positive end and the negative end of the insulation detector are connected with the positive end and the negative end of the electronic load, the positive end and the negative end of the electronic load are connected with the positive end and the negative end of the boosting DC-DC module, and the positive end and the negative end of the boosting DC-DC module are connected with the positive end and the negative end of the power supply output end of the Fuel Cell (FC) to be tested. The device is internally integrated with relays of different high-voltage power utilization components, and the on-line monitoring of the insulation resistance values of the different high-voltage power utilization components to the ground and the negative ground can be realized through the closing/opening of the relays.
Compared with the prior art, the insulation detection device provided by the embodiment realizes real-time monitoring of the insulation resistance of the fuel cell to be detected or the insulation resistance of the high-voltage electric component in the test by installing the insulation detector capable of detecting on line between the positive interface and the negative interface of the electronic load. Insulation detection is an indispensable item in factory testing, and the insulation resistance value in factory testing is monitored on line through the embodiment, so that potential safety hazards caused by contact inspection of high-voltage components one by a worker holding tools are avoided. Meanwhile, the insulation detection function of the device comprises dry insulation detection, wet insulation detection and the like, and after the device has the online insulation detection capability, the dry insulation detection and the wet insulation detection can be optimized and integrated, so that the device is an online, safe, systematic and efficient insulation test device which can be used in a fuel cell test scene.
Example 2
The improvement is made on the basis of the embodiment 1, and the high-voltage electricity utilization component comprises a PTC heater, an air compressor and a water pump in the fuel cell to be tested, as shown in fig. 2.
In the fuel cell to be tested, the PTC heater and the water pump are connected in series and are all arranged on a cooling liquid circulation pipeline of the fuel cell to be tested, so that the temperature of a cooling medium is regulated and controlled. The air compressor is arranged on an air inlet pipeline of the fuel cell to be tested and used for controlling the air to be piled.
Preferably, the test bench also has integrated thereon a deionization tank storing a cooling medium. The output end of the deionization tank is connected with a cooling cavity water filling port of the fuel cell to be tested; and a switch control valve is arranged on a pipeline between the output end of the deionizing tank and the water injection port of the cooling cavity of the fuel cell to be tested, and the control end of the switch control valve is electrically connected with a wet insulation detection control key.
The deionized water tank flows through the cooling medium to perform the deionized function. The cooling medium may be deionized water, antifreeze, or the like.
Preferably, the insulation detection device further comprises a water tank, an exhaust valve and a conductivity detector.
The water tank is arranged in the cooling liquid external circulation loop of the fuel cell to be tested on the test bench, and the input end of the water tank is connected with the output end of the ion tank and is used as a water filling port of the cooling cavity of the fuel cell to be tested.
And the exhaust valve is arranged at the top of the water tank and used for being synchronously started with the switch control valve.
And the electrode of the conductivity detector extends into the cooling medium of the cooling liquid circulation loop of the fuel cell to be detected and is used for acquiring the conductivity of the cooling medium. Specifically, the conductivity detector is arranged in the cooling liquid external circulation loop of the fuel cell to be tested.
Preferably, the insulation detection device further comprises an all-in-one controller.
The all-in-one controller is used for starting a dry insulation detection control key firstly to directly start the fuel cell to be detected for dry insulation detection, and collecting insulation detector data as a dry insulation detection result to be output by controlling the closing of a corresponding relay; and after confirming that the dry insulation detection result is normal (namely, each data is in the respective normal operation range), starting a wet insulation detection control key, controlling an exhaust valve to be opened so as to perform water injection and exhaust, starting the fuel cell to be detected to perform wet insulation detection, and collecting insulation detector data as the wet insulation detection result by controlling the closing of a corresponding relay.
The input end of the all-in-one controller is connected with the insulation detector, and the output end of the all-in-one controller is connected with a dry insulation detection control key, a wet insulation detection control key, a control end of the PTC heater and a control end of the exhaust valve on the test bench.
Preferably, a control program for warming up, water injection and exhaust is arranged in the all-in-one controller, and the warming up process is to set lower current values, such as 49A and 234A, operate in a low-power state, humidify and activate the humidifier, increase the working temperature and humidity of the battery, activate the membrane electrode and the like. The PTC heater is not activated during this process.
Preferably, the insulation detection device further comprises an upper computer.
The upper computer is used for man-machine interaction, controls the test board through the all-in-one controller and acquires data of the insulation detector, can be arranged at any place convenient for a user to operate, and can be a notebook computer connected to a local area network. The upper computer can be used for controlling the test bench and the insulation detector to read the required parameters.
The data end of the upper computer is connected with the data end of the all-in-one controller, and the upper computer is provided with a display control panel.
Preferably, the all-in-one controller is provided with a display module; and the display screen of the display module displays a dry insulation detection result and a wet insulation detection result respectively.
The dry insulation detection result and the wet insulation detection result both comprise insulation resistance values of the whole system of the fuel cell to be detected and insulation resistance values of the PTC heater, the water pump and the air compressor.
Preferably, the insulation detector further comprises a first detection module and a second detection module.
And the first detection module is used for starting after all the relays are closed and outputting the insulation resistance value of the whole system of the fuel cell to be detected.
And the second detection module is used for starting only when one relay is started, and outputting the insulation resistance value of the high-voltage power utilization component in the fuel cell to be detected corresponding to the relay.
Preferably, the insulation detection device further comprises a first pressure relief unit and a second pressure relief unit for releasing residual charges in the high-voltage system of the fuel cell.
The first pressure relief unit and the second pressure relief unit comprise a discharge resistor and a discharge contactor which are sequentially connected in series.
One end of the discharge resistor in the first pressure relief unit is connected with the positive electrode of the power supply output end of the fuel cell to be tested, and one end of the discharge contactor is connected with the negative electrode of the power supply output end of the fuel cell to be tested and is grounded.
One end of the discharge resistor in the second pressure relief unit is connected with a positive input interface of the electronic load, and one end of the discharge contactor is connected with a negative input interface of the electronic load and is grounded.
When the PTC relays 12 and 13 are closed independently, the insulation resistance value of the PTC heater is measured by the insulation detector; when the water pump relays 14 and 15 are closed independently, the insulation detector measures the insulation resistance value of the water pump; when the relays 16 and 17 of the air compressor are individually closed, the insulation detector measures the insulation resistance value of the air compressor; at the time of detection, the stack relays 18, 19 are always in the closed state.
The factory detection process can comprise the processes of dry insulation detection, water adding and exhausting, wet insulation detection, warming-up, operating condition point operation and the like, and after the online insulation detection capability is provided, the dry insulation detection, water adding and exhausting, wet insulation detection and warming-up steps can be optimized and integrated.
Compared with the prior art, the insulation detection device for the proton exchange membrane fuel cell has the following beneficial effects:
1. the dry insulation detection, the warm-up, the water adding and exhausting, and the wet insulation detection processes are optimized and integrated, so that the safe, systematic and efficient insulation detection device for the fuel cell system is provided.
2. The insulation detection can be automatically carried out, the dry insulation detection is carried out firstly, then the wet insulation detection is carried out, the insulation resistance of the fuel cell system is detected in the dry state, the high-voltage component which is in insulation failure can be preliminarily removed, the threat to the personal safety of a user after water and air are added and exhausted is avoided, the insulation resistance of the fuel cell system is further detected in the wet state, and whether the electric leakage phenomenon exists in the fuel cell engine under the condition of adding the cooling medium can be judged.
3. Before starting up, a warming-up process is needed, including activating the humidifier (running for a set time at low power) and making the operating temperature of the fuel cell engine reach the temperature required for running, so as to ensure the test effect.
4. And the heating operation and the water adding and exhausting operation are combined, the water adding and exhausting operation is performed while the heating operation is performed, under the condition that the conductivity of a cooling medium is qualified, the insulation resistance value in a wet state is monitored in real time, along with the reduction of bubbles, the insulation resistance value in the wet state is gradually reduced, the insulation resistance value in the wet state is read after the stable value is reached, and the subsequent test is performed after the cooling medium is qualified, so that the effect of the subsequent test is ensured.
The foregoing description of the embodiments of the present disclosure has been presented for purposes of illustration and description, and is not intended to be exhaustive or limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the various embodiments described. The terminology used herein is chosen in order to best explain the principles of the embodiments, the practical application, or the improvement of the prior art, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.
Claims (10)
1. The insulation detection device for the proton exchange membrane fuel cell is characterized by comprising a test bench capable of being provided with a fuel cell to be tested, a boosting DC-DC module, an electronic load, an insulation detector and a plurality of relays which are independently controlled; wherein,,
the test bench is provided with a dry insulation detection control key for directly starting the fuel cell to be tested and a wet insulation detection control key for controlling the fuel cell to be tested to be started after the cooling cavity of the fuel cell to be tested is filled with cooling medium;
one path of the power supply output end of the fuel cell to be tested is connected with an electronic load after passing through the boosting DC-DC module, and the other path of the power supply output end of the fuel cell to be tested is connected with the power supply end of a corresponding high-voltage power utilization component in the fuel cell to be tested through an independently controlled relay respectively; the insulation detector is connected between the positive interface and the negative interface of the electronic load.
2. The insulation detection device for proton exchange membrane fuel cells according to claim 1, wherein the high-voltage electricity utilization component comprises a PTC heater, an air compressor, a water pump in the fuel cell to be tested; wherein,,
the PTC heater and the water pump are connected in series and are arranged on a cooling liquid circulation pipeline of the fuel cell to be tested;
the air compressor is arranged on an air inlet pipeline of the fuel cell to be tested.
3. The insulation detection device for proton exchange membrane fuel cells as claimed in claim 2, wherein a deionization tank storing a cooling medium is further integrated on the test bench; wherein,,
the output end of the deionization tank is connected with a cooling cavity water filling port of the fuel cell to be tested; and a switch control valve is arranged on a pipeline between the output end of the deionizing tank and the water injection port of the cooling cavity of the fuel cell to be tested, and the control end of the switch control valve is electrically connected with a wet insulation detection control key.
4. The insulation detection device for a proton exchange membrane fuel cell as claimed in claim 3, further comprising:
the water tank is arranged in the cooling liquid external circulation loop of the fuel cell to be tested on the test bench, and the input end of the water tank is connected with the output end of the ion tank and is used as a water filling port of a cooling cavity of the fuel cell to be tested;
and the exhaust valve is arranged at the top of the water tank and used for being synchronously started with the switch control valve.
5. The insulation detection device for a proton exchange membrane fuel cell as claimed in claim 4, further comprising:
and the electrode of the conductivity detector extends into the cooling medium of the cooling liquid circulation loop of the fuel cell to be detected and is used for acquiring the conductivity of the cooling medium.
6. The insulation detection device for proton exchange membrane fuel cell according to claim 5, further comprising an all-in-one controller for starting a dry insulation detection control key to directly start a fuel cell to be detected and perform dry insulation detection and collecting insulation detector data as a dry insulation detection result output by controlling closing of a corresponding relay, starting a wet insulation detection control key after confirming that the dry insulation detection result is normal and controlling an exhaust valve to open to perform water injection and exhaust, restarting the fuel cell to be detected to perform wet insulation detection, and collecting insulation detector data as a wet insulation detection result by controlling closing of the corresponding relay; wherein,,
the input end of the all-in-one controller is connected with the insulation detector, and the output end of the all-in-one controller is connected with the control ends of the dry insulation detection control key, the wet insulation detection control key and the exhaust valve on the test bench.
7. The insulation detection device for a proton exchange membrane fuel cell according to claim 6, further comprising an upper computer for man-machine interaction and controlling the test bench through the all-in-one controller and acquiring insulation detector data; wherein,,
the data end of the upper computer is connected with the data end of the all-in-one controller, and the upper computer is provided with a display control panel.
8. The insulation detection device for a proton exchange membrane fuel cell as claimed in claim 6 or 7, wherein the all-in-one controller has a display module; and the display screen of the display module displays a dry insulation detection result and a wet insulation detection result respectively.
9. The insulation detection apparatus for a proton exchange membrane fuel cell as claimed in any one of claims 1 to 7, wherein the insulation detector further comprises a first detection module and a second detection module; wherein,,
the first detection module is used for starting after all relays are closed and outputting an insulation resistance value of the whole system of the fuel cell to be detected;
and the second detection module is used for starting only when one relay is started, and outputting the insulation resistance value of the high-voltage power utilization component in the fuel cell to be detected corresponding to the relay.
10. The insulation detection apparatus for a proton exchange membrane fuel cell according to any one of claims 1 to 7, further comprising a first pressure relief unit, a second pressure relief unit for releasing residual charges in a high-voltage system of the fuel cell;
the first pressure relief unit and the second pressure relief unit comprise a discharge resistor and a discharge contactor which are sequentially connected in series;
in the first pressure relief unit, one end of a discharge resistor is connected with the positive electrode of the power supply output end of the fuel cell to be tested, and one end of a discharge contactor is connected with the negative electrode of the power supply output end of the fuel cell to be tested and is grounded;
in the second pressure relief unit, one end of the discharge resistor is connected with a positive input interface of the electronic load, and one end of the discharge contactor is connected with a negative input interface of the electronic load and is grounded.
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