A method for rapid detection of dry state insulation of fuel cell

Abstract

The present application relates to the field of fuel cell detection, and discloses a kind of fuel cell dry state insulation rapid detection method, comprising the following steps: S1, connect fuel cell with measuring table, S2, connect fuel cell with comprehensive safety testing instrument, and test fuel cell positive and negative pole insulation value, S3, disconnect fuel cell and comprehensive safety testing instrument connection, S4, connect measuring table with fuel cell three cavity mouth and use bolt locking, open measuring table and carry out fuel cell activation polarization performance test, record fuel cell performance test data and wet state insulation value and form test report, S5, separate fuel cell and measuring table, fuel cell is placed on turnover car and is pulled back assembly workshop, S6, fuel cell fine assembly, after assembly is completed, repeat step S2, test fuel cell positive and negative pole dry state insulation value and record, by the scheme, the attenuation trend of fuel cell dry state insulation value can be rapidly detected and the minimum value that can be attenuated.

Description

Technical Field

[0001] This invention relates to the field of fuel cell insulation testing, and in particular to a rapid method for testing the dry-state insulation of fuel cells. Background Technology

[0002] A fuel cell is a chemical device that directly converts the chemical energy of fuel into electrical energy; it is also known as an electrochemical generator. Compared to traditional generator sets, fuel cells operate much more quietly. Furthermore, the electrochemical reaction is clean and complete, producing very few harmful substances. All of these factors make fuel cells a promising energy source, and currently, they are commonly used to power vehicles.

[0003] After assembly, the dry-state insulation value of a fuel cell weakens with storage time and changes in temperature and humidity, but stabilizes within a certain period. The dry-state insulation value is a standard for determining whether a fuel cell can continue to be used. When the dry-state insulation value is lower than the company's required value (since there is currently no national standard, fuel cells are set according to the customer's established standard value), continued use of the fuel cell will affect vehicle safety. Therefore, before supplying fuel cells to companies, it is necessary to detect the degradation trend of the fuel cell's dry-state insulation value and the minimum value it can degrade to. However, current technologies for detecting the dry-state insulation value of fuel cells are relatively time-consuming, thus extending the delivery period. Furthermore, during the testing period, the fuel cell must be stored in the warehouse for an extended period, which affects fuel cell delivery and use. Therefore, it is essential to provide a method for rapidly detecting the degradation trend of the fuel cell's dry-state insulation value and the minimum value it can degrade to. Summary of the Invention

[0004] To address the technical problem of long detection time for dry-state insulation values ​​in fuel cells in existing technologies, this invention discloses a rapid detection method for dry-state insulation in fuel cells, which is implemented as follows:

[0005] A rapid method for detecting dry-state insulation in fuel cells includes the following steps:

[0006] S1, Connect the fuel cell to the measurement station;

[0007] S2. Connect the fuel cell to the comprehensive safety tester and test the insulation value of the positive and negative electrodes of the fuel cell;

[0008] S3. Disconnect the fuel cell from the integrated safety tester;

[0009] S4. Connect the measuring platform to the fuel cell three-chamber port and tighten the bolts. Turn on the measuring platform to perform fuel cell activation polarization performance test, record fuel cell performance test data and wet insulation value and generate a test report.

[0010] S5. Separate the fuel cell from the measurement platform, place the fuel cell on a transfer vehicle and pull it back to the assembly workshop;

[0011] S6. Fuel cell assembly: After assembly, repeat step S2 to test and record the dry-state insulation values ​​of the positive and negative electrodes of the fuel cell.

[0012] Step S1 includes:

[0013] S1.1 The fuel cell is placed on a transfer cart at the same height as the measuring platform;

[0014] S1.2 Connect the test pipe of the measuring station to the fuel cell air inlet and lock it in place;

[0015] S1.3 Set the measuring platform as required and continuously introduce air into the fuel cell sealed box from the fuel cell air inlet;

[0016] Step S2 includes:

[0017] S2.1. Turn on the main power of the integrated safety tester and enter the main operating desktop;

[0018] S2.2, Configure the insulation test function;

[0019] S2.3, Set the test voltage;

[0020] S2.4, Set the insulation test time;

[0021] S2.5. Automatically measure and record the positive electrode insulation value of the fuel cell using a comprehensive safety tester;

[0022] S2.6 Press the "Stop" button and wait 10 seconds to allow the device to fully discharge.

[0023] S2.7 Measure and record the positive electrode insulation value of the fuel cell using a comprehensive safety tester;

[0024] S2.8 Press the "Stop" button and wait 10 seconds to allow the device to fully discharge.

[0025] Preferably, the method further includes step S7, which involves letting the fuel cell stand for more than 12 hours, repeating step S2, and testing and recording the dry-state insulation of the fuel cell again.

[0026] Preferably, in step S1.3, the duration of air introduction is 20 minutes;

[0027] The air introduced is air with a dew point temperature of 45°C, a temperature of 45°C, a humidity of 100%, and a flow rate of 40 SLPM.

[0028] Preferably, the fuel cell needs to be purged before proceeding to step S4.

[0029] Implementing this solution can solve the technical problem of long detection time for dry-state insulation value of fuel cells in the existing technology; this solution can achieve the technical effect of rapidly detecting the degradation trend of dry-state insulation value of fuel cells and the minimum value that can be degraded by continuously introducing warm and humid air into the sealed housing of the fuel cell through the fuel cell air inlet. Attached Figure Description

[0030] To illustrate the present invention more clearly, the accompanying drawings described below are merely one embodiment of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without any creative effort.

[0031] Figure 1 This is a block diagram illustrating the principle of dry-state insulation value detection for fuel cells. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] Example

[0034] In one specific embodiment, such as Figure 1 As shown, a rapid detection method for dry-state insulation of a fuel cell includes the following steps:

[0035] S1, Connect the fuel cell to the measurement station;

[0036] S2. Connect the fuel cell to the comprehensive safety tester and test the insulation value of the positive and negative electrodes of the fuel cell;

[0037] S3. Disconnect the fuel cell from the integrated safety tester;

[0038] S4. Connect the measuring platform to the fuel cell three-chamber port and tighten the bolts. Turn on the measuring platform to perform fuel cell activation polarization performance test. After the test is completed, record the fuel cell performance test data and wet insulation value and generate a test report.

[0039] S5. Loosen the bolts connecting the test connector of the test bench to the three-chamber port of the fuel cell, separate the fuel cell from the test bench, place the fuel cell on the transfer cart and pull it back to the assembly workshop;

[0040] S6. Fuel cell assembly: After assembly, repeat step S2 to test and record the dry-state insulation values ​​of the positive and negative electrodes of the fuel cell.

[0041] Step S1 includes:

[0042] S1.1 The fuel cell is placed on a transfer cart at the same height as the measuring platform;

[0043] S1.2 Connect the test pipe of the measuring station to the fuel cell air inlet and lock it in place;

[0044] S1.3 Set the measuring platform as required and continuously introduce air into the fuel cell sealed box from the fuel cell air inlet;

[0045] Step S2 includes:

[0046] S2.1. Turn on the main power of the integrated safety tester and enter the main operating desktop;

[0047] S2.2 Select “IR” in the function bar and press it. The function item will be displayed as “Insulated Fuel Cell (IR)”. Press the “Setup” key to set the insulation test function.

[0048] S2.3. Use the directional keys to select the "Voltage" function bar to start setting the test voltage. Press the value to be set in the right-hand digital setting area. The voltage unit is KV. The test requirement is 1000V. Set it to 1.0. Select "KV" and press it. Then press the "Setup" key again to complete the voltage setting.

[0049] S2.4. Using the directional keys, select the "Time" tab. In the right-hand numerical setting area, the time unit is seconds. Set the time between 0.5 and 5.0 seconds. 0.5-5 is the time range of the comprehensive safety tester. Although the length of the test time will affect the insulation value, the impact is minimal within the 0.5-5.0 second range. To minimize the influence of external factors, the insulation detection is set to 0.5 seconds in this embodiment. After setting the parameters, select "S" and press it, then press the "Setup" key again to complete the voltage setting.

[0050] S2.5 Test the insulation value of the positive electrode of the fuel cell. With the red clip of the integrated safety tester attached to the copper plate of the positive electrode of the fuel cell and the black clip attached to any threaded hole of the fuel cell housing, press the "start" button and the integrated safety tester will automatically measure and record the insulation value of the positive electrode of the fuel cell.

[0051] S2.6 Press the "Stop" button and wait 10 seconds to allow the device to fully discharge.

[0052] S2.7 Test the insulation value of the negative electrode of the fuel cell. With the red clip of the integrated safety tester attached to the copper plate negative electrode of the fuel cell and the black clip attached to any threaded hole of the fuel cell housing, press the "start" button. The integrated safety tester will automatically measure and record the insulation value of the positive electrode of the fuel cell.

[0053] S2.8 Press the "Stop" button and wait 10 seconds to allow the device to fully discharge.

[0054] In a preferred embodiment, in order to detect the effect of long-term storage of fuel cells on the dry-state insulation value of fuel cells, the detection step further includes step S7, which involves placing the fuel cell for more than 12 hours, repeating step S2, and testing the dry-state insulation of the fuel cell again and recording the results.

[0055] In a preferred embodiment, since fuel cells are greatly affected by humidity, in order to simulate and verify the lowest value that the dry insulation value of the fuel cell can decay to when stored in the worst natural environment, in step S1.3, air with temperature and humidity is introduced for a duration of 20 minutes, specifically air with a gas dew point temperature of 45°C, a gas temperature of 45°C, a humidity of 100%, and a flow rate of 40 SLPM.

[0056] In a preferred embodiment, since the fuel cell is started in step S2 and water is generated inside during operation, the fuel cell needs to be purged with air or nitrogen before step S4.

[0057] The beneficial effects of this invention are:

[0058] 1. Rapidly verify and test the dry-state insulation stability value of fuel cells to improve product delivery efficiency;

[0059] 2. To prevent the dry-state insulation value of the fuel cell from decaying to below the enterprise's required value due to prolonged storage, which could cause the fuel cell system to fail to start;

[0060] 3. Rapidly verify the dry-state insulation stability value of fuel cells, improve the safety of fuel cell use, and avoid vehicle safety problems caused by using fuel cells with poor dry-state insulation.

Claims

1. A rapid detection method for dry-state insulation of a fuel cell, characterized in that, The steps include the following: S1, Connect the fuel cell to the measurement station; S2. Connect the fuel cell to the comprehensive safety tester and test the insulation value of the positive and negative electrodes of the fuel cell; S3. Disconnect the fuel cell from the integrated safety tester; S4. Connect the measuring platform to the fuel cell three-chamber port and tighten the bolts. Turn on the measuring platform to perform fuel cell activation polarization performance test, record fuel cell performance test data and wet insulation value and generate a test report. S5. Separate the fuel cell from the measurement platform, place the fuel cell on a transfer vehicle and pull it back to the assembly workshop; S6. Fuel cell assembly: After assembly, repeat step S2 to test and record the dry-state insulation values ​​of the positive and negative electrodes of the fuel cell. Step S1 includes: S1.1 The fuel cell is placed on a transfer cart at the same height as the measuring platform; S1.2 Connect the test pipe of the measuring station to the fuel cell air inlet and lock it in place; S1.3 Set the measuring platform as required and continuously introduce air into the fuel cell sealed box from the fuel cell air inlet; Step S2 includes: S2.

1. Turn on the main power of the integrated safety tester and enter the main operating desktop; S2.2, Configure the insulation test function; S2.3, Set the test voltage; S2.4, Set the insulation test time; S2.

5. Automatically measure and record the positive electrode insulation value of the fuel cell using a comprehensive safety tester; S2.6 Press the "Stop" button and wait 10 seconds to allow the device to fully discharge. S2.7 Measure and record the positive electrode insulation value of the fuel cell using a comprehensive safety tester; S2.8 Press the "Stop" button and wait 10 seconds to allow the device to fully discharge. In step S1.3, the duration of air introduction is 20 minutes; The air introduced is air with a dew point temperature of 45°C, a temperature of 45°C, a humidity of 100%, and a flow rate of 40 SLPM.

2. The rapid detection method for dry-state insulation of a fuel cell according to claim 1, characterized in that, It also includes step S7, which involves letting the fuel cell stand for more than 12 hours, repeating step S2, and testing and recording the dry-state insulation of the fuel cell again.

3. The rapid detection method for dry-state insulation of a fuel cell according to claim 2, characterized in that, Before proceeding with step S4, the fuel cell needs to be purged with nitrogen or air.

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