Fuel cell back pressure valve low temperature performance test system and test method

Abstract

The present invention discloses a low temperature performance test system and test method for a fuel cell back pressure valve, belonging to the field of fuel cell technology. The system includes: an environmental chamber, which is used to respond to the temperature setting instruction input by the operator to provide a temperature test environment lower than the set temperature for the back pressure valve; an air subsystem test bench, which is located in the environmental chamber, and is used to respond to the operating condition setting instruction input by the operator to provide the back pressure valve with a gas environment under the target operating condition; a test device, which is used to control the power on and off of the back pressure valve, and send a valve opening control instruction with a target opening parameter to the back pressure valve after the back pressure valve is powered on; after the back pressure valve is opened according to the valve opening control instruction, the actual opening parameter of the back pressure valve is detected; and the actual opening parameter and the target opening parameter are compared to determine the performance test result of the back pressure valve. The system can be used to accurately test and verify the low temperature performance of the back pressure valve in the early stage of system development, providing a guarantee for the normal use of the subsequent back pressure valve.

Description

Technical Field

[0001] The present invention relates to the technical field of fuel cells, and in particular to a low temperature performance test system and test method for a fuel cell back pressure valve. Background Art

[0002] The fuel cell back pressure valve is an important component in the fuel cell system. Its function is to provide stable pressure for the air path of the fuel cell stack to ensure the normal operation of the system. The low temperature start performance of the back pressure valve is the key to the low temperature cold start of the fuel cell system. Therefore, it is very important to conduct low temperature performance tests on the back pressure valve.

[0003] The current existing technology (such as patents with publication numbers CN111090049A and CN112331889A) only discloses a cold start test verification method for a fuel cell system, but does not have a separate method for testing and verifying the low-temperature performance of a back-pressure valve. Therefore, it is impossible to verify the low-temperature performance of the back-pressure valve in the early stage of system development, which will affect the normal use of the back-pressure valve in the fuel cell in the later stage. Summary of the invention

[0004] In view of the above problems, the present invention is proposed to provide a fuel cell back pressure valve low temperature performance test system and test method that overcomes the above problems or at least partially solves the above problems. The low temperature performance of the back pressure valve can be tested and verified to provide a guarantee for the subsequent low temperature cold start of the fuel cell system.

[0005] In a first aspect, a fuel cell back pressure valve low temperature performance test system is provided, the system comprising:

[0006] An environmental box, for providing a temperature test environment lower than a set temperature for a back pressure valve of a fuel cell located in the environmental box in response to a temperature setting instruction input by an operator;

[0007] An air subsystem test bench, located in the environmental chamber, for providing a gas environment under target working conditions for the back pressure valve in response to working condition setting instructions input by an operator;

[0008] A testing device is used to control the power on and off of the back pressure valve, and send a valve opening control instruction with a target opening parameter to the back pressure valve after the back pressure valve is powered on; after the back pressure valve is opened according to the valve opening control instruction, detect the actual opening parameter of the back pressure valve; compare the actual opening parameter with the target opening parameter to determine the performance test result of the back pressure valve.

[0009] Optionally, the gas environment under the target working condition is a gas environment of a test gas having target gas parameters;

[0010] The air subsystem test bench includes a working condition setting module, and the working condition setting module is used to provide the test gas of the target gas parameter to the back pressure valve in response to the working condition setting instruction input by the operator;

[0011] The target gas parameter includes at least one of a target flow rate, a target temperature, a target humidity, and a target liquid water content.

[0012] Optionally, the working condition setting module includes an air supply unit, and a temperature and humidity control unit, a flow regulating unit and a liquid water content control unit arranged between the outlet of the air supply unit and the air inlet of the back pressure valve;

[0013] The gas supply unit is used to provide test gas to the back pressure valve; the temperature and humidity control unit is used to control the temperature of the test gas to reach the target temperature, and the humidity to reach the target humidity; the flow regulating unit is used to control the flow of the test gas to reach the target flow; the liquid water content control unit is used to control the liquid water content in the test gas to reach the target liquid water content.

[0014] Optionally, the working condition setting module further includes a control unit, and a flow meter, a temperature and humidity sensor, and a moisture meter arranged between the outlet of the air supply unit and the air inlet of the back pressure valve;

[0015] The flow meter is used to measure the flow rate of the test gas; the temperature and humidity sensor is used to measure the temperature and humidity of the test gas; the moisture meter is used to measure the liquid water content in the test gas;

[0016] The control unit is used to obtain the measurement values ​​of the flow meter, the temperature and humidity sensor and the moisture meter, and when the flow measured by the flow meter does not reach the target flow, control the flow regulation unit to regulate the flow of the test gas until the flow measured by the flow meter reaches the target flow; when the temperature or humidity measured by the temperature and humidity sensor does not reach the target temperature or the target humidity, control the temperature and humidity control unit to regulate the temperature or humidity of the test gas until the temperature and humidity measured by the temperature and humidity sensor reach the target temperature and the target humidity; when the liquid water content measured by the moisture meter does not reach the target liquid water content, control the liquid water content control unit to regulate the liquid water content in the test gas until the liquid water content measured by the moisture meter reaches the target liquid water content.

[0017] Optionally, the air subsystem test bench further comprises a purge control module, and the purge control module is used to provide purge gas to the back pressure valve in response to a purge instruction issued by an operator.

[0018] In a second aspect, a method for testing the low temperature performance of a fuel cell back pressure valve is provided, wherein the method adopts the system as described in the first aspect, and the method comprises:

[0019] The environmental box responds to the temperature setting instruction input by the operator, provides a temperature test environment lower than the set temperature for the back pressure valve of the fuel cell located in the environmental box, so that the back pressure valve is frozen for a set time in the temperature test environment lower than the set temperature;

[0020] An air subsystem test bench located in the environmental chamber provides a gas environment under a target working condition for the back pressure valve in response to a working condition setting instruction issued by an operator, so that the back pressure valve operates for a set time under the gas environment;

[0021] The testing device controls the back-pressure valve to power off, and after the back-pressure valve is frozen for a set time in a temperature test environment lower than a set temperature, the testing device controls the back-pressure valve to power on, and sends a first valve opening control instruction with a first target opening parameter to the back-pressure valve after the back-pressure valve is powered on; after the back-pressure valve is opened according to the first valve opening control instruction, detects a first actual opening parameter of the back-pressure valve; and compares the first actual opening parameter with the first target opening parameter to determine a performance test result of the back-pressure valve.

[0022] Optionally, a set volume of liquid water is dripped into the valve inlet and outlet of the back-pressure valve respectively, and the back-pressure valve with inlet and outlet mounting joints is located in the environmental box in a horizontal state or a vertical state.

[0023] Optionally, comparing the first actual opening parameter with the first target opening parameter to determine a performance test result of the back pressure valve includes:

[0024] determining a first difference between the first actual opening parameter and the first target opening parameter;

[0025] When the first difference is within a preset error threshold range, it is determined that the performance test result of the back pressure valve is qualified.

[0026] Optionally, after the back pressure valve is frozen in a temperature test environment lower than a set temperature for a set time and before the air subsystem test bench provides the back pressure valve with a gas environment under a target working condition, the method further includes:

[0027] The testing device controls the back pressure valve to be powered on, and sends a second valve opening control instruction with a second target opening parameter to the back pressure valve after the back pressure valve is powered on; after the back pressure valve is opened according to the second valve opening control instruction, detects a second actual opening parameter of the back pressure valve; compares the second actual opening parameter with the second target opening parameter to preliminarily determine a performance test result of the back pressure valve;

[0028] When it is preliminarily determined that the performance test result of the back pressure valve is qualified, the air subsystem test bench responds to the working condition setting instruction issued by the operator to provide the back pressure valve with a gas environment under the target working condition;

[0029] When it is preliminarily determined that the performance test results of the back pressure valve are unqualified, the test is terminated.

[0030] Optionally, after the back pressure valve operates for a set time in the gas environment and before the testing device controls the back pressure valve to power off, the method further includes:

[0031] The air subsystem test bench provides purge gas to the back-pressure valve in response to a purge command input by an operator, and purges the back-pressure valve for a set time.

[0032] The technical solution provided in the embodiments of the present invention has at least the following technical effects or advantages:

[0033] An embodiment of the present invention provides a fuel cell back pressure valve low temperature performance test system and test method, the system includes an environmental chamber and an air subsystem test bench. Among them, the environmental chamber can provide a temperature test environment lower than the set temperature for the back pressure valve of the fuel cell located in the environmental chamber, and the air subsystem test bench can provide a gas environment under the target working condition for the back pressure valve. Therefore, by adopting this system, the actual working environment of the back pressure valve when working in the fuel cell system can be accurately simulated. Then, the actual opening parameters of the back pressure valve in the simulated environment can be detected by the test device, and the performance test results of the back pressure valve in the low temperature environment can be determined by comparing the difference between the actual opening parameters and the target opening parameters, so as to realize the experimental verification of the low temperature performance of the back pressure valve in the early stage of system development, and provide guarantee for the normal use of the back pressure valve in the fuel cell system in the future.

[0034] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented according to the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] By reading the detailed description of the preferred embodiment below, various other advantages and benefits will become clear to those of ordinary skill in the art. The accompanying drawings are only used for the purpose of illustrating the preferred embodiment and are not considered to be limitations of the present invention. In addition, the same reference symbols are used to represent the same components throughout the accompanying drawings.

[0036] In the attached picture:

[0037] Figure 1 It is a structural block diagram of a fuel cell back pressure valve low temperature performance test system provided by an embodiment of the present invention;

[0038] Figure 2 It is a structural block diagram of an air subsystem test bench provided by an embodiment of the present invention;

[0039] Figure 3 It is a flow chart of a method for testing the low temperature performance of a fuel cell back pressure valve provided by an embodiment of the present invention;

[0040] Figure 4 is a schematic diagram of the three-dimensional structure of a back pressure valve provided by an embodiment of the present invention;

[0041] Figure 5 It is a side view of a back pressure valve provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0042] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings.

[0043] Various structural schematic diagrams according to embodiments of the present disclosure are shown in the accompanying drawings. These figures are not drawn to scale, and some details are magnified and some details may be omitted for the purpose of clear expression. The shapes of various regions and layers shown in the figures and the relative sizes and positional relationships therebetween are only exemplary, and may deviate in practice due to manufacturing tolerances or technical limitations, and those skilled in the art may further design regions / layers with different shapes, sizes, and relative positions according to actual needs.

[0044] In the context of the present disclosure, when a layer / element is referred to as being "on" another layer / element, the layer / element may be directly on the other layer / element, or there may be an intervening layer / element therebetween. Additionally, if a layer / element is "on" another layer / element in one orientation, the layer / element may be "below" the other layer / element when the orientation is reversed. In the context of the present disclosure, similar or identical components may be denoted by the same or similar reference numerals.

[0045] In order to better understand the above-mentioned technical scheme, the above-mentioned technical scheme will be described in detail below in combination with specific implementation methods. It should be understood that the embodiments of the present disclosure and the specific features in the embodiments are detailed descriptions of the technical scheme of the present application, rather than limitations on the technical scheme of the present application. In the absence of conflict, the embodiments of the present application and the technical features in the embodiments can be combined with each other.

[0046] Figure 1 : is a structural block diagram of a fuel cell back pressure valve low temperature performance test system provided by an embodiment of the present invention, such as Figure 1 As shown, the system 100 includes an environmental chamber 10 , an air subsystem test bench 20 , and a test device 30 .

[0047] The environmental box 10 is used to respond to the temperature setting instruction input by the operator and provide a temperature test environment lower than the set temperature for the back pressure valve of the fuel cell located in the environmental box. The air subsystem test bench 20 is located in the environmental box 10 and is used to respond to the operating condition setting instruction input by the operator and provide a gas environment under the target operating condition for the back pressure valve. The test device is used to control the power on and off of the back pressure valve, and send a valve opening control instruction with a target opening parameter to the back pressure valve after the back pressure valve is powered on; after the back pressure valve is opened according to the valve opening control instruction, the actual opening parameter of the back pressure valve is detected; and the actual opening parameter is compared with the target opening parameter to determine the performance test result of the back pressure valve.

[0048] In this embodiment, the environmental box 10 can be a closed box with adjustable temperature. By placing the back pressure valve in the environmental box 10, the temperature environment of the back pressure valve when the fuel cell system is working in a low temperature environment can be simulated. Exemplarily, the environmental box 10 can provide a low temperature test environment of -30°C for the back pressure valve. The test device 30 is electrically connected to the back pressure valve, which can not only realize the upper and lower electrical control of the back pressure valve, but also transmit signals to the back pressure valve.

[0049] Optionally, the gas environment under the target working condition is a gas environment of the test gas having target gas parameters.

[0050] The air subsystem test bench 20 includes a working condition setting module 20a, which is used to provide test gas with target gas parameters to the back pressure valve in response to a working condition setting instruction input by an operator. The target gas parameters include at least one of a target flow rate, a target temperature, a target humidity, and a target liquid water content.

[0051] In the present embodiment, the target operating condition may be an idle operating condition or a rated operating condition. When the target operating condition is an idle operating condition, the operating condition setting module may provide a test gas having a first target flow rate, a first target temperature, a first target humidity, and a first target liquid water content to the back pressure valve to simulate the gas environment of the back pressure valve when the fuel cell system is in an idle operating condition. When the target operating condition is a rated operating condition, the operating condition setting module may provide a test gas having a second target flow rate, a second target temperature, a second target humidity, and a second target liquid water content to the back pressure valve to simulate the gas environment of the back pressure valve when the fuel cell system is in a rated operating condition. Specifically, the values ​​of each target gas parameter may be determined by the staff according to relevant technical documents or experience, and the embodiments of the present invention do not limit this.

[0052] Figure 2 is a structural block diagram of an air subsystem test bench provided by an embodiment of the present invention, such as Figure 2 As shown, the working condition setting module 20a includes an air supply unit 21, and a temperature and humidity control unit 22, a flow regulating unit 23 and a liquid water content control unit 24 arranged between the outlet of the air supply unit 21 and the air inlet of the back pressure valve.

[0053] The gas supply unit 21 is used to provide test gas to the back pressure valve; the temperature and humidity control unit 22 is used to control the temperature of the test gas to reach the target temperature, and the humidity to reach the target humidity; the flow regulating unit 23 is used to control the flow of the test gas to reach the target flow; the liquid water content control unit 24 is used to control the liquid water content in the test gas to reach the target liquid water content.

[0054] In a specific implementation, the air supply unit 21 may be an air compressor. After the test gas output by the air compressor passes through the temperature and humidity control unit 22, the flow regulating unit 23 and the liquid water content control unit 24, the test gas with the target temperature, target humidity, target flow and target liquid water content can be obtained.

[0055] In this embodiment, the temperature, humidity, flow rate and liquid water content of the test gas provided by the air subsystem test bench 20 may be the required values ​​of the fuel cell under rated working condition or idle working condition set by the technician. For example, the temperature range may be 75°C to 90°C, the humidity range may be 70% to 100%, the flow rate may be 500slpm to 7000slpm, and the liquid water content may be 5 to 10g / L.

[0056] Alternatively, if Figure 2 As shown, the working condition setting module 20a also includes a control unit 25, and a flow meter 26, a temperature and humidity sensor 27 and a moisture meter 28 arranged between the outlet of the air supply unit 21 and the air inlet of the back pressure valve.

[0057] The flow meter 26 is used to measure the flow rate of the test gas; the temperature and humidity sensor 27 is used to measure the temperature and humidity of the test gas; and the moisture meter 28 is used to measure the liquid water content in the test gas.

[0058] The control unit 25 is used to obtain the measurement values ​​of the flow meter 26, the temperature and humidity sensor 27 and the moisture meter 28, and when the flow measured by the flow meter 26 does not reach the target flow, the flow regulating unit is controlled to adjust the flow of the test gas until the flow measured by the flow meter 26 reaches the target flow; when the temperature or humidity measured by the temperature and humidity sensor 27 does not reach the target temperature or target humidity, the temperature and humidity control unit is controlled to adjust the temperature or humidity of the test gas until the temperature and humidity measured by the temperature and humidity sensor 27 reach the target temperature and target humidity; when the liquid water content measured by the moisture meter 28 does not reach the target liquid water content, the liquid water content control unit is controlled to adjust the liquid water content in the test gas until the liquid water content measured by the moisture meter 28 reaches the target liquid water content.

[0059] In this embodiment, the air supply unit 21, the temperature and humidity control unit 22, the flow regulating unit 23, the liquid water content control unit 24, the flow meter 26, the temperature and humidity sensor 27 and the moisture meter 28 are all electrically connected to the control unit 25 to achieve signal transmission. The control unit 25 can also control parameters such as the air supply time and the rotation speed of the air supply unit 21.

[0060] The flow meter 26 can be arranged between the flow regulating unit 23 and the air inlet of the back pressure valve. When the flow meter 26 detects that the flow of the test gas adjusted by the flow regulating unit 23 does not reach the target flow, the control unit 25 can further control the flow regulating unit 23 to adjust the flow of the test gas to reach the target flow value, thereby forming a feedback control loop.

[0061] Likewise, the temperature and humidity sensor 27 can be disposed between the temperature and humidity control unit 22 and the air inlet of the back pressure valve. The moisture meter 28 can be disposed between the liquid water content control unit 24 and the air inlet of the back pressure valve to form a feedback control loop.

[0062] Alternatively, if Figure 1 As shown, the air subsystem test bench 20 further includes a purge control module 20b, which is used to provide purge gas to the back pressure valve in response to a purge instruction issued by an operator to simulate a purge operating environment when the fuel cell system is shut down.

[0063] In one implementation of this embodiment, the purge control module 20b can be an air compressor. At this time, the valve opening of the back pressure valve can be adjusted to a set value, and the air compressor provides purge gas to purge the back pressure valve. For example, the speed of the air compressor can be set to 30000-50000rpm, the valve opening of the back pressure valve can be set to 50%-90%, the purge time can be set to 0.5-2min, and after the purge is completed, the air compressor is controlled to stop.

[0064] It should be noted that the purge control module 20b and the gas supply unit 21 may be the same compressor, so as to respectively provide the test gas and the purge gas.

[0065] Optionally, the test device 30 may include a controller and a valve opening detection unit. The valve opening detection unit may detect the actual opening of the back pressure valve and send the detected actual opening parameter to the controller. The controller may be used to control the power on and off of the back pressure valve, and send a valve opening control instruction to the back pressure valve after the back pressure valve is powered on; receive the actual opening parameter sent by the valve opening detection unit, and compare the actual opening parameter with the target opening parameter to determine the performance test result of the back pressure valve.

[0066] In this embodiment, when the difference between the actual opening parameter and the target opening parameter is within a preset error threshold range, it is determined that the performance test result of the back pressure valve is qualified.

[0067] For example, the error threshold range is ±3%. If the actual opening of the back pressure valve can reach the target opening according to the valve opening control instruction, and the error is less than or equal to 3%, it can be determined that the performance test result of the back pressure valve is qualified. On the contrary, if the error is greater than 3%, it can be determined that the performance test result of the back pressure valve is unqualified.

[0068] An embodiment of the present invention further provides a method for testing the low temperature performance of a fuel cell back pressure valve, which method adopts the test system described in the above embodiment. Figure 3 : is a flow chart of a method for testing the low temperature performance of a fuel cell back pressure valve provided by an embodiment of the present invention. Figure 3 As shown, the method includes:

[0069] Step S301, the environmental box responds to the temperature setting instruction input by the operator, provides a temperature test environment below the set temperature for the back pressure valve of the fuel cell located in the environmental box, and freezes the back pressure valve in the temperature test environment below the set temperature for a set time.

[0070] Exemplarily, the temperature setting instruction carries the temperature parameter and freezing time parameter set by the operator. The temperature parameter may be -30°C ± 3°C, and the freezing time parameter may be 24h ± 0.5h, so as to truly simulate the actual low-temperature working environment of the back pressure valve.

[0071] Optionally, after executing step S301 and before executing step S302, the method may further include:

[0072] The test device controls the back pressure valve to be powered on, and sends a second valve opening control instruction with a second target opening parameter to the back pressure valve after the back pressure valve is powered on; after the back pressure valve is opened according to the second valve opening control instruction, detects a second actual opening parameter of the back pressure valve; compares the second actual opening parameter with the second target opening parameter to preliminarily determine a performance test result of the back pressure valve;

[0073] When it is preliminarily determined that the performance test result of the back pressure valve is qualified, the air subsystem test bench responds to the operating condition setting instruction issued by the operator to provide the back pressure valve with a gas environment under the target operating condition;

[0074] When it is preliminarily determined that the performance test results of the back pressure valve are unqualified, the test is terminated.

[0075] In the above steps, when the second difference between the second actual opening parameter and the second target opening parameter is within the preset error threshold range, it can be preliminarily determined that the performance test result of the back pressure valve is qualified, and step S302 can be continued. On the contrary, when the second difference exceeds the preset error threshold range, it can be preliminarily determined that the performance test result of the back pressure valve is unqualified. At this time, the test is terminated and the subsequent steps are not executed, which can simplify the test steps and save test time. Exemplarily, the error threshold range is ±3%.

[0076] In step S301, a set volume of liquid water is dripped into the valve inlet and outlet of the back pressure valve respectively, and the back pressure valve with inlet and outlet mounting joints is placed in an environmental chamber in a horizontal or vertical state.

[0077] Figure 4 is a schematic diagram of a three-dimensional structure of a back pressure valve provided by an embodiment of the present invention, such as Figure 4 As shown, the back pressure valve 40 is provided with an inlet installation joint 41 and an outlet installation joint 42 . Figure 5 is a side view of a back pressure valve provided by an embodiment of the present invention, such as Figure 5 As shown, the back pressure valve 40 has a valve inlet P1, and the valve inlet P1 has a dripping area A, through which liquid water can be dripped. Similarly, the back pressure valve 40 has a valve outlet (not shown in the figure), and the valve outlet also has a dripping area, through which liquid water can be dripped.

[0078] In one implementation of this embodiment, the back pressure valve with the inlet and outlet installation joints can be placed vertically in an environmental chamber, the temperature of the environmental chamber is set to -30°C ± 3°C, 5 ml of liquid water is dripped into the inlet end of the back pressure valve, and 1 ml of liquid water is dripped into the outlet end of the back pressure valve, so that the back pressure valve is frozen at the set temperature for 24h ± 0.5h. Then, the back pressure valve is placed in the environmental chamber in a vertical state and frozen for a period of time, and then the valve opening is tested by the test device to preliminarily judge whether the performance test result of the back pressure valve is qualified.

[0079] In another implementation of this embodiment, the back pressure valve with the inlet and outlet installation joints can be placed horizontally in an environmental box, the temperature of the environmental box is set to -30°C ± 3°C, 5 ml of liquid water is dripped into the inlet end of the back pressure valve, and 1 ml of liquid water is dripped into the outlet end of the back pressure valve, so that the back pressure valve is frozen at the set temperature for 24h ± 0.5h. Then, the back pressure valve is placed horizontally in the environmental box and frozen for a period of time, and then the valve opening is tested by the test device to preliminarily judge whether the performance test result of the back pressure valve is qualified.

[0080] It should be noted that due to the different usage scenarios of the back pressure valve, the back pressure valve may be placed in a vertical position or in a horizontal position when it is actually installed. Therefore, the present invention can test whether the low temperature performance of the back pressure valve meets the requirements when the back pressure valve is placed in an environmental box in a vertical or horizontal state according to actual needs. It is also possible to simultaneously test whether the performance test results of the back pressure valve are qualified when the back pressure valve is placed in an environmental box in a vertical and horizontal state, so as to ensure that the low temperature performance of the back pressure valve can meet the requirements regardless of the form in which the back pressure valve is installed. At the same time, the embodiment of the present invention simulates the water content of the back pressure valve in actual work by dripping a set volume of liquid water into the inlet and outlet of the back pressure valve. By placing the inlet and outlet installation joints of the back pressure valve together in the environmental box for testing, the joint design and actual arrangement of the back pressure valve are fully considered, so that the low temperature performance test results of the back pressure valve can be made more accurate. The volume of liquid water dripped into the inlet and outlet of the back pressure valve shown above is only an example, and it can actually be other set volumes, which can be set by the staff according to the actual situation, and the present invention does not limit this.

[0081] Step S302, the air subsystem test bench located in the environmental box provides a gas environment under the target working condition for the back pressure valve in response to the working condition setting instruction issued by the operator, so that the back pressure valve operates for a set time in the gas environment.

[0082] Exemplarily, the operating condition setting instruction may include an idle operating condition setting instruction and a rated operating condition setting instruction. When the operating condition setting instruction is an idle operating condition setting instruction, the air subsystem test bench may provide the back pressure valve with a test gas having a first target flow rate, a first target temperature, a first target humidity, and a first target liquid water content to simulate the gas environment of the back pressure valve when the fuel cell system is in an idle operating condition. When the operating condition setting instruction is a rated operating condition setting instruction, the air subsystem test bench may provide the back pressure valve with a test gas having a second target flow rate, a second target temperature, a second target humidity, and a second target liquid water content to simulate the gas environment of the back pressure valve when the fuel cell system is in a rated operating condition.

[0083] The operating condition setting instruction may also carry an operating time parameter, and the air subsystem test bench may provide the back pressure valve with a set time of test gas according to the operating time parameter, so that the back pressure valve operates for a set time in the gas environment under the target operating condition. The operating time may be, for example, 10 minutes, etc., which is not limited in the embodiment of the present invention.

[0084] It should be noted that when the air subsystem test bench provides test gas to the back pressure valve, the temperature of the environmental chamber is still at the set temperature (eg -30°C ± 3°C), and the back pressure valve opening is the set opening.

[0085] Optionally, after executing step S302 and before executing step S303, the method may further include:

[0086] The air subsystem test bench responds to the purge command input by the operator to provide purge gas to the back-pressure valve and purge the back-pressure valve for a set time.

[0087] For example, the purge control module of the air subsystem test bench can provide purge gas to the back pressure valve. The purge control module can be an air compressor. After the back pressure valve runs stably for 10 minutes, the air compressor speed is set to 40000rpm, the back pressure valve opening is 90%, the purge time is 1 minute, and the machine is shut down after the purge is completed.

[0088] Step S303, the testing device controls the back-pressure valve to power off, and after the back-pressure valve is frozen for a set time in a temperature test environment lower than the set temperature, the testing device controls the back-pressure valve to power on, and after the back-pressure valve is powered on, sends a first valve opening control instruction with a first target opening parameter to the back-pressure valve; after the back-pressure valve is opened according to the first valve opening control instruction, detects a first actual opening parameter of the back-pressure valve; and compares the first actual opening parameter with the first target opening parameter to determine a performance test result of the back-pressure valve.

[0089] Exemplarily, after the back pressure valve is frozen in a temperature test environment lower than the set temperature for 24 hours, the back pressure valve can be controlled to be powered on.

[0090] Optionally, comparing the first actual opening parameter with the first target opening parameter to determine a performance test result of the back pressure valve includes:

[0091] Determining a first difference between a first actual opening parameter and a first target opening parameter;

[0092] When the first difference is within a preset error threshold range, it is determined that the performance test result of the back pressure valve is qualified.

[0093] Exemplarily, the error threshold range is ±3%. If the first difference is less than or equal to 3%, it can be determined that the performance test result of the back pressure valve is qualified. Conversely, if the first difference is greater than 3%, it can be determined that the performance test result of the back pressure valve is unqualified.

[0094] In this embodiment, step S302 and step S303 can be performed multiple times to comprehensively judge whether the performance test results of the back pressure valve are qualified based on the results of multiple tests, so that the final test results of the low temperature performance of the back pressure valve are more accurate.

[0095] Exemplarily, step S302 and step S303 are performed n times. If the results of n tests are all qualified, the performance test result of the back pressure valve can be finally determined to be qualified. If the result of any test is unqualified, the performance test result of the back pressure valve can be finally determined to be unqualified. n can be set according to actual needs, for example, 3≤n≤5.

[0096] The technical solutions in the above embodiments of the present application have at least the following technical effects or advantages:

[0097] An embodiment of the present invention provides a fuel cell back pressure valve low temperature performance test system and test method, the system includes an environmental chamber and an air subsystem test bench. Among them, the environmental chamber can provide a temperature test environment lower than the set temperature for the back pressure valve of the fuel cell located in the environmental chamber, and the air subsystem test bench can provide a gas environment under the target working condition for the back pressure valve. Therefore, by adopting this system, the actual working environment of the back pressure valve when working in the fuel cell system can be accurately simulated. Then, the actual opening parameters of the back pressure valve in the simulated environment can be detected by the test device, and the performance test results of the back pressure valve in the low temperature environment can be determined by comparing the difference between the actual opening parameters and the target opening parameters, so as to realize the experimental verification of the low temperature performance of the back pressure valve in the early stage of system development, and provide guarantee for the normal use of the back pressure valve in the fuel cell system in the future.

[0098] In the description provided herein, a large number of specific details are described. However, it is understood that embodiments of the present invention can be practiced without these specific details. In some instances, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this description.

[0099] Similarly, it should be understood that in order to streamline the present disclosure and aid in understanding one or more of the various inventive aspects, in the above description of exemplary embodiments of the present invention, various features of the present invention are sometimes grouped together into a single embodiment, figure, or description thereof. However, this disclosed method should not be interpreted as reflecting the intention that the claimed invention requires more features than those explicitly recited in each claim. More specifically, as reflected in the claims below, inventive aspects lie in less than all the features of the individual embodiments disclosed above. Therefore, the claims that follow the specific embodiment are hereby expressly incorporated into the specific embodiment, with each claim itself serving as a separate embodiment of the present invention.

[0100] It should be noted that the above-mentioned embodiments illustrate rather than limit the invention and that those skilled in the art will be able to design alternative embodiments without departing from the scope of the appended claims.

Claims

1. A fuel cell back pressure valve low temperature performance test system, characterized in that: The system comprises: An environmental box, for providing a temperature test environment lower than a set temperature for a back pressure valve of a fuel cell located in the environmental box in response to a temperature setting instruction input by an operator; An air subsystem test bench, located in the environmental chamber, for providing a gas environment under target working conditions for the back pressure valve in response to working condition setting instructions input by an operator; A test device, used to control the power on and off of the back pressure valve, and send a valve opening control instruction with a target opening parameter to the back pressure valve after the back pressure valve is powered on; after the back pressure valve is opened according to the valve opening control instruction, detect the actual opening parameter of the back pressure valve; compare the actual opening parameter with the target opening parameter to determine the performance test result of the back pressure valve; The testing device is further used to: after the back pressure valve operates in the gas environment for a set time, control the back pressure valve to power off, after the back pressure valve is frozen in a temperature test environment lower than the set temperature for a set time, control the back pressure valve to power on, and after the back pressure valve is powered on, send the valve opening control instruction with the target opening parameter to the back pressure valve; The gas environment under the target working condition is a gas environment of the test gas under the target gas parameters; The air subsystem test bench includes a working condition setting module, and the working condition setting module is used to provide the test gas of the target gas parameter to the back pressure valve in response to the working condition setting instruction input by the operator; The target gas parameters include target flow rate, target temperature, target humidity and target liquid water content.

2. The system according to claim 1, characterized in that The working condition setting module includes an air supply unit, and a temperature and humidity control unit, a flow regulating unit, and a liquid water content control unit arranged between the outlet of the air supply unit and the air inlet of the back pressure valve; The gas supply unit is used to provide test gas to the back pressure valve; the temperature and humidity control unit is used to control the temperature of the test gas to reach the target temperature, and the humidity to reach the target humidity; the flow regulating unit is used to control the flow of the test gas to reach the target flow; the liquid water content control unit is used to control the liquid water content in the test gas to reach the target liquid water content.

3. The system according to claim 2, characterized in that The working condition setting module also includes a control unit, and a flow meter, a temperature and humidity sensor, and a moisture meter arranged between the outlet of the air supply unit and the air inlet of the back pressure valve; The flow meter is used to measure the flow rate of the test gas; the temperature and humidity sensor is used to measure the temperature and humidity of the test gas; the moisture meter is used to measure the liquid water content in the test gas; The control unit is used to obtain the measurement values ​​of the flow meter, the temperature and humidity sensor and the moisture meter, and when the flow measured by the flow meter does not reach the target flow, control the flow regulating unit to regulate the flow of the test gas until the flow measured by the flow meter reaches the target flow; When the temperature or humidity measured by the temperature and humidity sensor does not reach the target temperature or the target humidity, the temperature and humidity control unit is controlled to adjust the temperature or humidity of the test gas until the temperature and humidity measured by the temperature and humidity sensor reach the target temperature and the target humidity; when the liquid water content measured by the moisture meter does not reach the target liquid water content, the liquid water content control unit is controlled to adjust the liquid water content in the test gas until the liquid water content measured by the moisture meter reaches the target liquid water content.

4. The system according to claim 1, characterized in that The air subsystem test bench further includes a purge control module, which is used to provide purge gas to the back pressure valve in response to a purge instruction issued by an operator.

5. A fuel cell back pressure valve low temperature performance test method, characterized in that: The method adopts the system according to any one of claims 1 to 4, and the method comprises: The environmental box responds to the temperature setting instruction input by the operator, provides a temperature test environment lower than the set temperature for the back pressure valve of the fuel cell located in the environmental box, so that the back pressure valve is frozen for a set time in the temperature test environment lower than the set temperature; The air subsystem test bench located in the environmental box provides a gas environment under a target working condition for the back pressure valve in response to a working condition setting instruction issued by an operator, so that the back pressure valve operates for a set time under the gas environment; the gas environment under the target working condition is a gas environment of the test gas under target gas parameters; the target gas parameters include target flow rate, target temperature, target humidity and target liquid water content; The testing device controls the back-pressure valve to power off, and after the back-pressure valve is frozen for a set time in a temperature test environment lower than a set temperature, the testing device controls the back-pressure valve to power on, and sends a first valve opening control instruction with a first target opening parameter to the back-pressure valve after the back-pressure valve is powered on; after the back-pressure valve is opened according to the first valve opening control instruction, detects a first actual opening parameter of the back-pressure valve; and compares the first actual opening parameter with the first target opening parameter to determine a performance test result of the back-pressure valve.

6. The method according to claim 5, characterized in that A set volume of liquid water is dripped into the valve inlet and outlet of the back pressure valve respectively, and the back pressure valve is provided with inlet and outlet installation joints and is located in the environmental box in a horizontal state or a vertical state.

7. The method according to claim 5, characterized in that The comparing the first actual opening parameter with the first target opening parameter to determine the performance test result of the back pressure valve includes: determining a first difference between the first actual opening parameter and the first target opening parameter; When the first difference is within a preset error threshold range, it is determined that the performance test result of the back pressure valve is qualified.

8. The method according to claim 5, characterized in that After the back pressure valve is frozen in a temperature test environment lower than a set temperature for a set time, and before the air subsystem test bench provides the back pressure valve with a gas environment under a target working condition, the method further includes: The testing device controls the back pressure valve to be powered on, and sends a second valve opening control instruction with a second target opening parameter to the back pressure valve after the back pressure valve is powered on; after the back pressure valve is opened according to the second valve opening control instruction, detects a second actual opening parameter of the back pressure valve; compares the second actual opening parameter with the second target opening parameter to preliminarily determine a performance test result of the back pressure valve; When it is preliminarily determined that the performance test result of the back pressure valve is qualified, the air subsystem test bench responds to the working condition setting instruction issued by the operator to provide the back pressure valve with a gas environment under the target working condition; When it is preliminarily determined that the performance test results of the back pressure valve are unqualified, the test is terminated.

9. The method according to claim 5, characterized in that After the back pressure valve operates for a set time under the gas environment and before the testing device controls the back pressure valve to power off, the method further includes: The air subsystem test bench provides purge gas to the back-pressure valve in response to a purge instruction input by an operator, and purges the back-pressure valve for a set time.

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