A durability test method and system for a fuel cell

Abstract

The present invention provides a durability test method and system for a fuel cell, including: S10, formulating an initial current variable load condition for the fuel cell according to the durability test requirements of the fuel cell; S20, operating the fuel cell according to the initial current variable load condition; S30, obtaining the actual pressure condition at the air inlet of the fuel cell under the initial current variable load condition; S40, updating the initial current variable load condition to a target current variable load condition following the actual pressure condition according to the actual pressure condition; S50, performing a durability test on the fuel cell according to the target current variable load condition. The target current variable load condition is updated according to the actual pressure condition at the air inlet, that is, the current variable load condition follows the actual pressure condition. Therefore, the present invention uses the target current variable load condition following the actual pressure condition at the air inlet to perform a durability test on the fuel cell, thereby improving the credibility of the durability test of the fuel cell.

Description

Technical Field

[0001] The present invention relates to the technical field of fuel cells, and more specifically, to a durability test method and system for a fuel cell. Background Art

[0002] The long-term durable operation of fuel cells has always been a key issue for engineering developers and scientific researchers in the field of fuel cells. The durability process of fuel cells is usually completed through tests under dynamic operating conditions. In the actual operation of a fuel cell system, due to the high degree of integration of system components and fuel cells, high degree of parameter matching, and timely control, the fuel cell can operate healthily, stably, and reliably, which is also one of the important reasons for the higher durability of fuel cells during system operation. However, in the initial stage of the actual design and development of fuel cells, the design and selection of system components of the fuel cell system have not been completed yet. At the same time, in order to control the operating cost of durability tests, fuel cell short stacks (compared with fuel cell stack products, short stacks contain fewer battery cells) are usually used for testing based on a fuel cell test bench. Since the durability test is a dynamic operating condition test, during the test process, various parameters of the reaction gas (reaction gas pressure, supply flow rate, etc.) are required to follow the real-time load parameters of the fuel cell, such as the applied current. However, existing fuel cell test devices or test benches cannot meet the requirements of dynamic load change rates. Compared with fuel cell systems, the operating condition control speed and accuracy will be greatly reduced. The main problem lies in the serious lag in the dynamic response of the reaction gas supply, and the operating conditions deviate significantly from the set values, resulting in low credibility, poor reproducibility, and weak comparability of durability test results. It will also cause the operating life of the fuel cell on the test bench to be much lower than the results during fuel cell system testing. Summary of the Invention

[0003] In view of this, the present invention provides a durability test method and system for a fuel cell, which effectively solves the technical problems existing in the prior art. By using a target current variable load condition that follows the actual pressure condition at the air inlet to perform durability tests on the fuel cell, the credibility of the durability test of the fuel cell can be improved.

[0004] To achieve the above object, the technical solutions provided by the present invention are as follows:

[0005] A durability test method for a fuel cell, comprising:

[0006] S10. According to the durability test requirements of the fuel cell, formulate an initial current variable load condition for the fuel cell;

[0007] S20. Operate the fuel cell according to the initial current variable load condition;

[0008] S30. Obtain the actual pressure condition of the air inlet of the fuel cell under the initial current load change condition;

[0009] S40. Update the initial current load change condition to a target current load change condition following the actual pressure condition according to the actual pressure condition;

[0010] S50. Conduct a durability test on the fuel cell according to the target current load change condition.

[0011] Optionally, after step S40 and before step S50, it further includes:

[0012] S401. Obtain the actual current load change condition of the fuel cell under the target current load change condition;

[0013] S402. Determine whether the difference between the actual current load change condition and the initial current load change condition is within a preset range. If so, proceed to step S50;

[0014] If not, after adjusting the air inlet flow rate of the fuel cell to adjust the actual pressure condition, repeat steps S40 to S402 until it is determined that the difference between the actual current load change condition and the initial current load change condition is within the preset range, and then proceed to step S50.

[0015] Optionally, step S402 includes:

[0016] Determine whether the RE value of the actual current load change condition and the initial current load change condition is not greater than a preset value, where:

[0017]

[0018] I seti is the current value at time t in the initial current load change condition, I fi is the current value at time t in the actual current load change condition, t1 is the selected starting time, and t2 is the selected ending time;

[0019] If so, proceed to step S50;

[0020] If not, after adjusting the air inlet flow rate of the fuel cell to adjust the actual pressure condition, repeat steps S40 to S402 until it is determined that the RE value of the actual current load change condition and the initial current load change condition is not greater than the preset value, and then proceed to step S50.

[0021] Optionally, step S20 includes:

[0022] S21. Develop a theoretical operating condition spectrum according to the initial current variable load condition. The theoretical operating condition spectrum includes the theoretical flow rate and pressure conditions at the air inlet of the fuel cell, the theoretical flow rate and pressure conditions at the hydrogen inlet of the fuel cell, and the theoretical flow rate condition of the cooling circuit of the fuel cell.

[0023] S22. Operate the fuel cell according to the theoretical operating condition spectrum.

[0024] Optionally, step S50 includes:

[0025] S51. Obtain the target flow rate and pressure conditions at the air inlet of the fuel cell according to the actual pressure condition.

[0026] S52. Develop the target flow rate and pressure conditions at the hydrogen inlet of the fuel cell according to the target current variable load condition.

[0027] S53. Develop the target flow rate condition of the cooling circuit of the fuel cell according to the target current variable load condition.

[0028] S54. According to the target flow rate and pressure conditions, target flow rate and pressure conditions, and target flow rate condition, for the

[0029] Correspondingly, the present invention further provides a durability test system for a fuel cell, including:

[0030] An initial development module, which is used to develop the initial current variable load condition of the fuel cell according to the durability test requirements of the fuel cell.

[0031] A control operation module, which is used to operate the fuel cell according to the initial current variable load condition.

[0032] A first acquisition module, which is used to acquire the actual pressure condition at the air inlet of the fuel cell under the initial current variable load condition.

[0033] An update module, which is used to update the initial current variable load condition to a target current variable load condition that follows the actual pressure condition according to the actual pressure condition.

[0034] A control test module, which is used to perform a durability test on the fuel cell according to the target current variable load condition.

[0035] Optionally, it further includes:

[0036] A second acquisition module, which is configured to acquire the actual current variable load condition of the fuel cell under the target current variable load condition after the update module updates the target current variable load condition and before the control test module performs a durability test on the fuel cell;

[0037] A judgment module, which is configured to judge whether the difference between the actual current variable load condition and the initial current variable load condition is within a preset range. If so, the control test module performs a durability test on the fuel cell according to the target current variable load condition;

[0038] If not, after adjusting the actual pressure condition by adjusting the air inlet flow rate of the fuel cell, the update module, the second acquisition module, and the judgment module repeat their operations until the judgment module determines that the difference between the actual current variable load condition and the initial current variable load condition is within the preset range, and then the control test module performs a durability test on the fuel cell according to the target current variable load condition.

[0039] Optionally, the judgment module is configured to judge whether the RE value of the actual current variable load condition and the initial current variable load condition is not greater than a preset value, where:

[0040]

[0041] I seti is the current value at time t in the initial current variable load condition, I fi is the current value at time t in the actual current variable load condition, t1 is the selected starting time, and t2 is the selected ending time;

[0042] If so, the control test module performs a durability test on the fuel cell according to the target current variable load condition;

[0043] If not, after adjusting the actual pressure condition by adjusting the air inlet flow rate of the fuel cell, the update module, the second acquisition module, and the judgment module repeat their operations until the judgment module determines that the difference between the actual current variable load condition and the initial current variable load condition is within the preset range, and then the control test module performs a durability test on the fuel cell according to the target current variable load condition.

[0044] Optionally, the control operation module includes:

[0045] A setting sub-module, which is used to formulate a theoretical operating condition spectrum according to the initial current variable load condition. The theoretical operating condition spectrum includes the theoretical flow rate and pressure condition of the air inlet of the fuel cell, the theoretical flow rate and pressure condition of the hydrogen inlet of the fuel cell, and the theoretical flow rate condition of the cooling circuit of the fuel cell;

[0046] A control sub-module, which is used to operate the fuel cell according to the theoretical operating condition spectrum.

[0047] Optionally, the control test includes:

[0048] An air path sub-module, which is used to obtain the target flow rate and pressure condition of the air inlet of the fuel cell according to the actual pressure condition;

[0049] A hydrogen path sub-module, which is used to formulate the target flow rate and pressure condition of the hydrogen inlet of the fuel cell according to the target current variable load condition;

[0050] A cooling path sub-module, which is used to formulate the target flow rate condition of the cooling circuit of the fuel cell according to the target current variable load condition;

[0051] An operation sub-module, which is used to conduct a durability test on the fuel cell according to the target flow rate and pressure condition, the target flow rate and pressure condition, and the target flow rate condition.

[0052] Compared with the prior art, the technical solution provided by the present invention has at least the following advantages:

[0053] The present invention provides a method and system for durability test of a fuel cell, including: S10, formulating an initial current variable load condition of the fuel cell according to the durability test requirement of the fuel cell; S20, operating the fuel cell according to the initial current variable load condition; S30, obtaining the actual pressure condition of the air inlet of the fuel cell under the initial current variable load condition; S40, updating the initial current variable load condition to a target current variable load condition following the actual pressure condition according to the actual pressure condition; S50, conducting a durability test on the fuel cell according to the target current variable load condition.

[0054] As can be seen from the above content, in the technical solution provided by the present invention, the target current variable load condition is updated according to the actual pressure condition of the air inlet, that is, the current variable load condition follows the actual pressure condition. Therefore, the present invention uses the target current variable load condition following the actual pressure condition of the air inlet to conduct a durability test on the fuel cell, thereby improving the credibility of the durability test of the fuel cell. Description of the Drawings

[0055] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings required for the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can be obtained according to the provided accompanying drawings.

[0056] Figure 1 It is a flowchart of a durability test method for a fuel cell provided by an embodiment of the present invention;

[0057] Figure 2 It is a flowchart of another durability test method for a fuel cell provided by an embodiment of the present invention;

[0058] Figure 3 It is a schematic structural diagram of a durability test system for a fuel cell provided by an embodiment of the present invention. Detailed implementation manners

[0059] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0060] As described in the background art, existing fuel cell test devices or test benches cannot meet the requirements of dynamic load change rates. Compared with fuel cell systems, the speed and accuracy of operating condition control will be greatly reduced. The main problem lies in the serious lag in the dynamic response of the supply of reaction gases, and the operating conditions deviate significantly from the set values, resulting in low credibility, poor reproducibility, and weak comparability of the durability test results. It will also cause the operating life of the fuel cell on the test bench to be much lower than the results during the fuel cell system test.

[0061] Based on this, the embodiments of the present invention provide a durability test method and system for a fuel cell, which effectively solve the technical problems existing in the prior art. The durability test of the fuel cell is carried out by using a target current variable load condition that follows the actual pressure condition of the air inlet, thereby improving the credibility of the durability test of the fuel cell.

[0062] To achieve the above object, the technical solutions provided by the embodiments of the present invention are as follows. Specifically, in combination with Figures 1 to 3 The technical solutions provided by the embodiments of the present invention are described in detail. Among them, the operating condition is parameter data that changes with time.

[0063] Refer to Figure 1As shown, it is a flowchart of a durability test method for a fuel cell provided by an embodiment of the present invention. The durability test method includes:

[0064] S10. Formulate an initial current variable load condition for the fuel cell according to the durability test requirements of the fuel cell.

[0065] S20. Operate the fuel cell according to the initial current variable load condition.

[0066] S30. Obtain the actual pressure condition at the air inlet of the fuel cell under the initial current variable load condition.

[0067] S40. Update the initial current variable load condition to a target current variable load condition that follows the actual pressure condition according to the actual pressure condition.

[0068] S50. Conduct a durability test on the fuel cell according to the target current variable load condition.

[0069] It can be understood that the target current variable load condition provided by the embodiment of the present invention is updated according to the actual pressure condition at the air inlet, that is, the current variable load condition follows the actual pressure condition. Therefore, the present invention uses the target current variable load condition that follows the actual pressure condition at the air inlet to conduct a durability test on the fuel cell, thereby improving the credibility of the durability test of the fuel cell.

[0070] In order to further improve the credibility of the durability test of the fuel cell under the relevant data of the initial current condition, the embodiment of the present invention can also verify the updated target current variable load condition and adjust it to have a small difference from the initial current variable load condition. As Figure 2 As shown, it is a flowchart of another durability test method for a fuel cell provided by an embodiment of the present invention. The durability test method includes:

[0071] S10. Formulate an initial current variable load condition for the fuel cell according to the durability test requirements of the fuel cell.

[0072] S20. Operate the fuel cell according to the initial current variable load condition.

[0073] S30. Obtain the actual pressure condition at the air inlet of the fuel cell under the initial current variable load condition.

[0074] S40. Update the initial current variable load condition to a target current variable load condition that follows the actual pressure condition according to the actual pressure condition.

[0075] S50. Conduct a durability test on the fuel cell according to the target current variable load condition.

[0076] Wherein, after step S40 and before step S50, the method further includes:

[0077] S401. Obtain the actual current load change condition of the fuel cell under the target current load change condition;

[0078] S402. Determine whether the difference between the actual current load change condition and the initial current load change condition is within a preset range. If so, proceed to step S50;

[0079] If not, after adjusting the air inlet flow rate of the fuel cell to adjust the actual pressure condition, repeat steps S40 to S402 until it is determined that the difference between the actual current load change condition and the initial current load change condition is within the preset range, and then proceed to step S50.

[0080] Specifically, step S402 provided in the embodiment of the present invention includes:

[0081] Determine whether the RE value of the actual current load change condition and the initial current load change condition is not greater than a preset value, where:

[0082]

[0083] I seti is the current value at time t in the initial current load change condition, I fi is the current value at time t in the actual current load change condition, t1 is the selected starting time, and t2 is the selected ending time;

[0084] If so, proceed to step S50;

[0085] If not, after adjusting the air inlet flow rate of the fuel cell to adjust the actual pressure condition, repeat steps S40 to S402 until it is determined that the RE value of the actual current load change condition and the initial current load change condition is not greater than the preset value, and then proceed to step S50.

[0086] It can be understood that the embodiment of the present invention can determine whether the actual current load change condition and the initial current load change condition are synchronized by judging the RE value, ensuring a high credibility of the durability test of the fuel cell under the relevant data of the initial current load change condition. The preset value provided in the embodiment of the present invention can be comprehensively formulated according to different test purposes, different fuel cell durability test equipment, different fuel cell products, and the actual operating characteristics of the fuel cell products. The present invention does not make specific limitations in this regard; optionally, the preset value provided in the embodiment of the present invention can be not greater than 30%.

[0087] In an embodiment of the present invention, the fuel cell provided by the present invention can be controlled and operated according to the relevant operating conditions of its air path, hydrogen path, and cooling path. That is, step S20 provided by the embodiment of the present invention includes:

[0088] S21. Formulate a theoretical operating condition spectrum according to the initial current variable load condition, where the theoretical operating condition spectrum includes the theoretical flow rate and pressure conditions at the air inlet of the fuel cell, the theoretical flow rate and pressure conditions at the hydrogen inlet of the fuel cell, and the theoretical flow rate condition of the cooling path of the fuel cell.

[0089] S22. Operate the fuel cell according to the theoretical operating condition spectrum.

[0090] And, step S50 provided by the embodiment of the present invention includes:

[0091] S51. Obtain the target flow rate and pressure conditions at the air inlet of the fuel cell according to the actual pressure condition.

[0092] S52. Formulate the target flow rate and pressure conditions at the hydrogen inlet of the fuel cell according to the target current variable load condition.

[0093] S53. Formulate the target flow rate condition of the cooling path of the fuel cell according to the target current variable load condition.

[0094] S54. Perform a durability test on the fuel cell according to the target flow rate and pressure conditions, target flow rate and pressure conditions, and target flow rate condition.

[0095] The technical solution provided by the present invention will be described in more detail below in combination with the above embodiments. Specifically, the test method provided by the embodiment of the present invention includes:

[0096] S10. Formulate the initial current variable load condition of the fuel cell according to the durability test requirements of the fuel cell.

[0097] Before the fuel cell undergoes a durability test, formulate the initial current variable load condition of the fuel cell according to the durability test requirements of the fuel cell as follows:

[0098] I = f 1 (t)

[0099] S21. Formulate a theoretical operating condition spectrum according to the initial current variable load condition, where the theoretical operating condition spectrum includes the theoretical flow rate and pressure conditions at the air inlet of the fuel cell, the theoretical flow rate and pressure conditions at the hydrogen inlet of the fuel cell, and the theoretical flow rate condition of the cooling path of the fuel cell.

[0100] Specifically, according to the initial current variable load conditions and the fuel cell operation conditions (the operation conditions are related controls corresponding to each operating current), the theoretical flow rate and pressure conditions of the air inlet of the fuel cell are formulated as follows:

[0101] Q air = f 2 (t)

[0102] P air = f 3 (t)

[0103] According to the initial current variable load conditions, the theoretical flow rate and pressure conditions of the hydrogen inlet of the fuel cell are formulated as follows:

[0104] Q H2 = f 4 (t)

[0105] P H2 = f 5 (t)

[0106] And, according to the initial current variable load conditions, the theoretical flow rate conditions of the cooling path of the fuel cell are formulated as follows:

[0107] Q coolant = f 6 (t)

[0108] After completing the above condition input, run the fuel cell to start the initial test.

[0109] S22. Run the fuel cell according to the theoretical operation condition spectrum.

[0110] S30. Obtain the actual pressure condition of the air inlet of the fuel cell under the initial current variable load condition.

[0111] S40. Update the initial current variable load condition to a target current variable load condition that follows the actual pressure condition according to the actual pressure condition.

[0112] Specifically, according to the actual pressure condition of the air inlet obtained above, re-formulate the current variable load condition, and update the initial current variable load condition of the following time to a target current variable load condition that follows the pressure condition of the air inlet, as follows:

[0113] I = f 1-1 (P air )

[0114] S401. Obtain the actual current variable load condition of the fuel cell under the target current variable load condition.

[0115] S402. Determine whether the RE values of the actual current variable load condition and the initial current variable load condition are not greater than a preset value, where:

[0116]

[0117] I seti is the current value at time t in the initial current variable load condition, and I fi is the current value at time t in the actual current variable load condition. t1 is the selected starting time, and t2 is the selected ending time;

[0118] If so, proceed to step S50;

[0119] If not, after adjusting the air inlet flow rate of the fuel cell to adjust the actual pressure condition, repeat steps S40 to S402 until it is determined that the RE values of the actual current variable load condition and the initial current variable load condition are not greater than the preset value, and then proceed to step S50.

[0120] S51. Obtain the target flow rate and pressure condition of the air inlet of the fuel cell according to the actual pressure condition.

[0121] When specifically collecting the pressure condition of the air inlet of the fuel cell, the actual target flow rate and pressure condition of the air inlet can be obtained simultaneously, as follows:

[0122] Q air = f 2-1 (t)

[0123] P air = f 3-1 (t)

[0124] S52. Develop the target flow rate and pressure condition of the hydrogen inlet of the fuel cell according to the target current variable load condition.

[0125] Specifically, according to the actual pressure condition of the air inlet and the control strategy of the hydrogen inlet following the air inlet, obtain the target flow rate and pressure condition of the hydrogen inlet of the fuel cell, as follows:

[0126] Q H2 = f 4-1 (P air )

[0127] P H2 = f 5-1 (P air )

[0128] S53. Develop the target flow rate condition of the cooling circuit of the fuel cell according to the target current variable load condition.

[0129] According to the re-established target current variable load condition, re-establish the parameter following strategy of the cooling circuit to obtain the target flow condition of the cooling circuit, as follows:

[0130] Q coolant = f 6-1 (I) or Q coolant = f 6-1 (P air )

[0131] S54. Perform a durability test on the fuel cell according to the target flow and pressure conditions, the target flow and pressure conditions, and the target flow condition.

[0132] Correspondingly, an embodiment of the present invention also provides a durability test system for a fuel cell. As Figure 3 shown, it is a schematic structural diagram of a durability test system for a fuel cell provided by an embodiment of the present invention. Among them, the system includes:

[0133] An initial formulation module 100, which is used to formulate an initial current variable load condition of the fuel cell according to the durability test requirements of the fuel cell.

[0134] A control operation module 200, which is used to operate the fuel cell according to the initial current variable load condition.

[0135] A first acquisition module 300, which is used to acquire the actual pressure condition at the air inlet of the fuel cell under the initial current variable load condition.

[0136] An update module 400, which is used to update the initial current variable load condition to a target current variable load condition following the actual pressure condition according to the actual pressure condition.

[0137] A control test module 500, which is used to perform a durability test on the fuel cell according to the target current variable load condition.

[0138] In order to further improve the credibility of the durability test of the fuel cell under the relevant data of the initial current condition, an embodiment of the present invention can also verify the updated target current variable load condition and adjust it to have a small difference from the initial current variable load condition. Specifically, the durability test system further includes:

[0139] A second acquisition module, which is used to acquire the actual current variable load condition of the fuel cell under the target current variable load condition after the update module updates the target current variable load condition and before the control test module performs a durability test on the fuel cell;

[0140] A judgment module, which is used to judge whether the difference between the actual current variable load condition and the initial current variable load condition is within a preset range. If so, the control test module performs a durability test on the fuel cell according to the target current variable load condition;

[0141] If not, after adjusting the actual pressure condition by adjusting the air inlet flow rate of the fuel cell, the update module, the second acquisition module, and the judgment module repeat their operations until the judgment module determines that the difference between the actual current variable load condition and the initial current variable load condition is within the preset range. Then, the control test module performs a durability test on the fuel cell according to the target current variable load condition.

[0142] Among them, the judgment module provided in the embodiment of the present invention is specifically used to judge whether the RE value of the actual current variable load condition and the initial current variable load condition is not greater than a preset value, where:

[0143]

[0144] I seti is the current value at time t in the initial current variable load condition, and I fi is the current value at time t in the actual current variable load condition. t1 is the selected starting time, and t2 is the selected ending time;

[0145] If so, the control test module performs a durability test on the fuel cell according to the target current variable load condition;

[0146] If not, after adjusting the actual pressure condition by adjusting the air inlet flow rate of the fuel cell, the update module, the second acquisition module, and the judgment module repeat their operations until the judgment module determines that the difference between the actual current variable load condition and the initial current variable load condition is within the preset range. Then, the control test module performs a durability test on the fuel cell according to the target current variable load condition.

[0147] In an embodiment of the present invention, the fuel cell provided by the present invention can be controlled and operated according to the relevant conditions of its air path, hydrogen path, and cooling path. Specifically, the control operation module provided in the embodiment of the present invention includes:

[0148] A setting sub-module, which is used to formulate a theoretical operation condition spectrum according to the initial current variable load condition. The theoretical operation condition spectrum includes the theoretical flow rate and pressure condition of the air inlet of the fuel cell, the theoretical flow rate and pressure condition of the hydrogen inlet of the fuel cell, and the theoretical flow rate condition of the cooling path of the fuel cell.

[0149] A control sub-module, which is used to operate the fuel cell according to the theoretical operating condition spectrum.

[0150] Furthermore, the control test provided by the embodiment of the present invention includes:

[0151] An air path sub-module, which is used to obtain the target flow rate and pressure condition of the air inlet of the fuel cell according to the actual pressure condition.

[0152] A hydrogen path sub-module, which is used to formulate the target flow rate and pressure condition of the hydrogen inlet of the fuel cell according to the target current variable load condition.

[0153] A cooling path sub-module, which is used to formulate the target flow rate condition of the cooling path of the fuel cell according to the target current variable load condition.

[0154] And an operation sub-module, which is used to conduct a durability test on the fuel cell according to the target flow rate and pressure condition, the target flow rate and pressure condition, and the target flow rate condition.

[0155] The embodiment of the present invention provides a method and system for durability test of a fuel cell, including: S10. Formulate the initial current variable load condition of the fuel cell according to the durability test requirement of the fuel cell; S20. Operate the fuel cell according to the initial current variable load condition; S30. Obtain the actual pressure condition of the air inlet of the fuel cell under the initial current variable load condition; S40. Update the initial current variable load condition to the target current variable load condition following the actual pressure condition according to the actual pressure condition; S50. Conduct a durability test on the fuel cell according to the target current variable load condition.

[0156] As can be seen from the above content, in the technical solution provided by the embodiment of the present invention, the target current variable load condition is updated according to the actual pressure condition of the air inlet, that is, the current variable load condition follows the actual pressure condition. Therefore, the embodiment of the present invention uses the target current variable load condition following the actual pressure condition of the air inlet to conduct a durability test on the fuel cell, thereby improving the credibility of the durability test of the fuel cell.

[0157] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A durability test method for a fuel cell, characterized in that, it includes: S10. According to the durability test requirements of the fuel cell, formulate an initial current variable load condition for the fuel cell; S20. Operate the fuel cell according to the initial current variable load condition; S30. Obtain the actual pressure condition at the air inlet of the fuel cell under the initial current variable load condition; S40. Update the initial current variable load condition to a target current variable load condition that follows the actual pressure condition according to the actual pressure condition; S50. Conduct a durability test on the fuel cell according to the target current variable load condition, including: S51. According to the actual pressure condition, obtain the target flow rate and pressure condition at the air inlet of the fuel cell; S52. According to the target current variable load condition, formulate the target flow rate and pressure condition at the hydrogen inlet of the fuel cell; S53. According to the target current variable load condition, formulate the target flow rate condition of the cooling circuit of the fuel cell; S54. Conduct a durability test on the fuel cell according to the target flow rate and pressure condition at the air inlet, the target flow rate and pressure condition at the hydrogen inlet, and the target flow rate condition of the cooling circuit.

2. The durability test method for a fuel cell according to claim 1, characterized in that, after step S40 and before step S50, it further includes: S401. Obtain the actual current variable load condition of the fuel cell under the target current variable load condition; S402. Judge whether the difference between the actual current variable load condition and the initial current variable load condition is within a preset range. If so, enter step S50; If not, after adjusting the air inlet flow rate of the fuel cell to adjust the actual pressure condition, repeat steps S40 to S402 until it is determined that the difference between the actual current variable load condition and the initial current variable load condition is within the preset range, and then enter step S50.

3. The durability test method for a fuel cell according to claim 2, characterized in that, step S402 includes: Judge whether the RE value of the actual current variable load condition and the initial current variable load condition is not greater than a preset value, where: I seti is the current value at time t in the initial current variable load condition, I fi is the current value at time t in the actual current variable load condition, t1 is the selected starting time, and t2 is the selected ending time; If so, enter step S50; If not, after adjusting the air inlet flow rate of the fuel cell to adjust the actual pressure condition, repeat steps S40 to S402 until it is determined that the RE value of the actual current variable load condition and the initial current variable load condition is not greater than the preset value, and then enter step S50.

4. The durability test method for a fuel cell according to claim 1, characterized in that, step S20 includes: S21. According to the initial current variable load condition, formulate a theoretical operation condition spectrum, and the theoretical operation condition spectrum includes the theoretical flow rate and pressure condition at the air inlet of the fuel cell, the theoretical flow rate and pressure condition at the hydrogen inlet of the fuel cell, and the theoretical flow rate condition of the cooling circuit of the fuel cell; S22. Operate the fuel cell according to the theoretical operation condition spectrum.

5. A durability test system for a fuel cell, characterized in that, it includes: Initial formulation module, which is used to formulate the initial current variable load condition of the fuel cell according to the durability test requirements of the fuel cell; Control operation module, which is used to operate the fuel cell according to the initial current variable load condition; First acquisition module, which is used to acquire the actual pressure condition at the air inlet of the fuel cell under the initial current variable load condition; Update module, which is used to update the initial current variable load condition to the target current variable load condition following the actual pressure condition according to the actual pressure condition; Control test module, which is used to conduct a durability test on the fuel cell according to the target current variable load condition; Among them, the control test includes: Air path sub-module, which is used to acquire the target flow rate and pressure condition at the air inlet of the fuel cell according to the actual pressure condition; Hydrogen path sub-module, which is used to formulate the target flow rate and pressure condition at the hydrogen inlet of the fuel cell according to the target current variable load condition; Cooling path sub-module, which is used to formulate the target flow rate condition of the cooling path of the fuel cell according to the target current variable load condition; Operation sub-module, which is used to conduct a durability test on the fuel cell according to the target flow rate and pressure condition at the air inlet, the target flow rate and pressure condition at the hydrogen inlet, and the target flow rate condition of the cooling path; 6. The durability test system of the fuel cell according to claim 5, characterized in that, further comprising: Second acquisition module, which is used to acquire the actual current variable load condition of the fuel cell under the target current variable load condition after the update module updates the target current variable load condition and before the control test module conducts a durability test on the fuel cell; Judgment module, which is used to judge whether the difference between the actual current variable load condition and the initial current variable load condition is within a preset range. If so, the control test module conducts a durability test on the fuel cell according to the target current variable load condition; If not, after adjusting the actual pressure condition by adjusting the air inlet flow rate of the fuel cell, the update module, the second acquisition module, and the judgment module work repeatedly until the judgment module determines that the difference between the actual current variable load condition and the initial current variable load condition is within the preset range, and then the control test module conducts a durability test on the fuel cell according to the target current variable load condition.

7. The durability test system of the fuel cell according to claim 6, characterized in that, the judgment module is used to judge whether the RE value of the actual current variable load condition and the initial current variable load condition is not greater than a preset value, where: I seti is the current value at time t in the initial current variable load condition, I fi is the current value at time t in the actual current variable load condition, t1 is the selected starting time, and t2 is the selected ending time; If so, the control test module conducts a durability test on the fuel cell according to the target current variable load condition; If not, after adjusting the air inlet flow rate of the fuel cell to adjust the actual pressure condition, the updating module, the second obtaining module, and the judging module repeat the operation until the judging module determines that the difference between the actual current load change condition and the initial current load change condition is within the preset range. Then, the control test module performs a durability test on the fuel cell according to the target current load change condition.

8. The durability test system for a fuel cell according to claim 5, wherein, the control operation module includes: a setting sub-module configured to formulate a theoretical operation condition spectrum according to the initial current load change condition, the theoretical operation condition spectrum including the theoretical flow rate and pressure condition of the air inlet of the fuel cell, the theoretical flow rate and pressure condition of the hydrogen inlet of the fuel cell, and the theoretical flow rate condition of the cooling circuit of the fuel cell; a control sub-module configured to operate the fuel cell according to the theoretical operation condition spectrum.

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