CN111141959A - Automatic test system and method for contact resistance curve of bipolar plate of fuel cell - Google Patents
Automatic test system and method for contact resistance curve of bipolar plate of fuel cell Download PDFInfo
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- CN111141959A CN111141959A CN201911260965.3A CN201911260965A CN111141959A CN 111141959 A CN111141959 A CN 111141959A CN 201911260965 A CN201911260965 A CN 201911260965A CN 111141959 A CN111141959 A CN 111141959A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/20—Measuring earth resistance; Measuring contact resistance, e.g. of earth connections, e.g. plates
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
- G01R1/04—Housings; Supporting members; Arrangements of terminals
- G01R1/0408—Test fixtures or contact fields; Connectors or connecting adaptors; Test clips; Test sockets
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/385—Arrangements for measuring battery or accumulator variables
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Abstract
The invention relates to an automatic test system and method for a contact resistance curve of a bipolar plate of a fuel cell, wherein the system comprises: the test control cabinet comprises a test table board and a controller; the testing component comprises an electrode for applying pressure to a testing sample, a pressure sensor for measuring the pressure between the electrode and the testing sample, and a digital multimeter for measuring the resistance between the electrode and the testing sample, wherein the electrode is fixed on the testing table and is driven to move along the vertical direction by an actuating mechanism, the pressure sensor is arranged on the electrode, and the positive electrode and the negative electrode of the digital multimeter are respectively and correspondingly connected with the electrode and the testing sample; the actuating mechanism is connected with the electrode and drives the electrode to move along the vertical direction; the adjustable support is used for fixing the actuating mechanism and adjusting the initial positions of the electrode and the actuating mechanism on the test table top, and the adjustable support is fixed on the test table top. Compared with the prior art, the method can simply, reliably, efficiently, accurately and reproducibly measure the contact resistance of the fuel cell bipolar plate.
Description
Technical Field
The invention belongs to the technical field of fuel cells, and particularly relates to an automatic test system and method for a contact resistance curve of a bipolar plate of a fuel cell.
Background
The fuel cell is a high-efficiency and environment-friendly power generation system for directly and continuously converting chemical energy into electric energy, and is a fourth power generation device following hydroelectric power, thermal power and nuclear power. The proton exchange membrane fuel cell has the advantages of long service life, high specific power and specific energy, high starting speed at room temperature and the like, can be used as a movable power supply and a fixed power supply, has wide application prospect in the fields of military affairs, traffic, communication and the like, and is considered to be one of ideal power sources meeting the requirements of future energy and environment. The bipolar plate is one of the core components of the proton exchange membrane fuel cell, occupies a large part of the mass and the cost of the cell group, and has the functions of uniformly distributing reaction gas, conducting current, connecting each monocell in series and the like. To meet these functional requirements, an ideal bipolar plate should have high thermal/electrical conductivity, corrosion resistance, low density, good mechanical properties, low cost, and easy processing. However, the bipolar plate produced at present has the problems of poor corrosion resistance and conductivity matching, high production cost, short service life and the like. The method realizes reasonable matching of the electrical conductivity and the corrosion resistance of the bipolar plate material, namely realizes high corrosion resistance on the premise of ensuring reasonable electrical conductivity, ensures the service life of the whole system, and is one of key links of fuel cell commercialization. The requirement for the conductivity test of the bipolar plate is more and more, and it is very important to efficiently and accurately obtain the contact resistance parameter of the bipolar plate by using a system test. Moreover, even if the stacks are assembled using exactly the same materials and components for different stack designs, the assembly forces may not be exactly the same; therefore, the variation curve of the contact resistance between the bipolar plate and the gas diffusion layer according to the assembly pressure is very important for the design of the stack, and has a great influence on the power generation performance and the service life of the stack.
The current patent for testing the contact resistance of fuel cell, for example, patent document CN101236221A is an electrical engineering method for testing the contact resistance between electrical connectors; the method tests the contact resistance between two metal pieces, and does not consider the contact resistance testing and data processing method under the condition of the existence of carbon paper; in addition, the method can only manually obtain contact resistance data under the influence of single pressure, cannot continuously test a plurality of pressure points, and does not meet the requirements of actual research and characterization of the contact resistance of the bipolar plate of the fuel cell.
Patent document CN109557375A is required for factory production and screening of bipolar plate products, and this patent can realize automatic pressurization test under a single pressure, automatically discriminate product quality according to test results, and perform screening placement, but does not consider a test and data processing method of contact resistance in the presence of carbon paper, and the test results will deviate from actual conditions far, and cannot perform continuous tests for multiple pressure points, and cannot well meet test requirements for trial-made samples in research and development.
The patent document CN207502614U is based on circuit breakers and disconnectors in high energy consumption industries such as electrolysis and metallurgy to solve the problem of contact resistance test of contacts, but is not directed to bipolar plate contact resistance test in the field of fuel cells, and needs to manually change pressure and is complicated to operate.
Patent document CN105572474A aims at accurately measuring the contact resistance of a large-area whole bipolar plate, and cannot meet the requirement of measuring the contact resistance of a small-area trial sample in research and development, and the device needs to be used in cooperation with an external press, which is cumbersome and cannot realize automatic measurement and recording.
Disclosure of Invention
The present invention is directed to overcoming the above-mentioned drawbacks of the prior art and providing a system and a method for automatically testing a contact resistance curve of a bipolar plate of a fuel cell.
The purpose of the invention can be realized by the following technical scheme:
an automatic test system for a contact resistance curve of a bipolar plate of a fuel cell, the system comprising:
testing the control cabinet: the device comprises a test table top for bearing a test sample and a controller for controlling the system to work;
test part: the electrode is fixed on a test table top and is driven to move along the vertical direction by an actuating mechanism, the pressure sensor is arranged on the electrode, and the positive electrode and the negative electrode of the digital multimeter are respectively correspondingly connected with the electrode and the test sample;
an executing mechanism: the actuating end is connected with an electrode, the electrode is driven to move along the vertical direction, and the pressure sensor is connected between the actuating end of the actuating mechanism and the electrode in series;
the adjustable support: the adjustable support is fixed on the test table top;
the pressure sensor, the digital multimeter and the actuating mechanism are all connected to the controller.
The test table comprises an insulation table body and an insulation base plate, wherein the insulation base plate is arranged on the insulation table body, and the insulation base plate is used for placing the test sample.
And a flexible insulator for buffering is connected in series between the electrode and the actuating mechanism.
The electrode comprises an electrode body, a connecting clamp and an adjustable clamp, wherein the connecting clamp is fixed at an actuating mechanism executing end through a clamp fastening screw, and the electrode body is detachably fixed on the connecting clamp through the adjustable clamp.
The actuating mechanism comprises a motor and an electric cylinder, the motor is connected with the electric cylinder, the output shaft of the electric cylinder is connected with the electrode, and the electric cylinder is fixed on the adjustable bracket.
Adjustable support include Z axle bracing piece and X axle bracing piece, Z axle support pole pass through Z axle fixer vertical fixation on test table face, X axle support pole be on a parallel with the setting of test table face, its middle part is connected through first adjustable connector and Z axle support pole, Z axle bracing piece can do the removal of level and vertical direction, an end of X axle bracing piece pass through the second adjustable connector and fix actuating mechanism.
The test control cabinet on be equipped with the control button that is used for switching over the shift knob of manual and automatic mode and manual control actuating mechanism operation, shift knob and control button all be connected to the controller.
The controller comprises a PLC controller.
An automatic test method for a contact resistance curve of a bipolar plate of a fuel cell is based on the automatic test system and comprises the following steps:
(1) placing a fuel cell bipolar plate to be tested on a test table, and aligning the position to be tested with a projection point of an electrode on an insulating platform;
(2) positive and negative leads of the digital multimeter are correspondingly connected to the electrodes and the fuel cell bipolar plate through alligator clips;
(3) placing the cut carbon paper on a test point of a bipolar plate of the fuel cell, wherein the area of the carbon paper is larger than the projection area of an electrode on an insulating platform;
(4) starting a controller, wherein the controller controls an actuating mechanism to drive the electrode to move downwards, and a contact resistance value is collected and stored at each set pressure point;
(5) fitting to obtain a first pressure-contact resistance curve f after data acquisition of all pressure points is completedep-cp/cp-bp(x) Where x is a pressure sequence, fep-cp/cp-bp(x) A first contact resistance value;
(6) the pre-fitted carbon paper pressure intensity-contact resistance curve f is adjustedep-cp(x)，fep-cp(x) The contact resistance value of the carbon paper and the electrode is shown;
(7) obtaining a contact resistance curve of the bipolar plate of the fuel cell:
fcp-bp(x)＝fep-cp/cp-bp(x)-fep-cp(x)，
wherein f iscp-bp(x) Is the contact resistance of the fuel cell bipolar plate and the carbon paper.
And (4) for a single pressure point, collecting the contact resistance under the pressure point for multiple times, removing the maximum value and the minimum value, averaging to obtain the contact resistance under the pressure point, and storing.
Compared with the prior art, the invention has the following advantages:
(1) the testing process is fully automatic, so that human errors in the testing process are effectively reduced, and the repeatability is good;
(2) the measurement accuracy is high: the invention utilizes the high-precision pressure sensor and carries out closed-loop control on the test pressure, so that the pressure progress is very high; meanwhile, the advantage of high-frequency data acquisition of the digital multimeter is utilized to realize the acquisition of a plurality of data points under each pressure point, so that random errors are effectively reduced;
(3) continuous measurement of multiple pressure points: after the test sequence is set, the system automatically tests in sequence according to the sequence, ensures that each test point is not repeated and omitted, outputs the test results of multiple pressure points, and is convenient for a user to compare and analyze the sizes of the contact resistances under different pressure points;
(4) according to the invention, after the first pressure-contact resistance curve is obtained, repeated testing is carried out by using the material consistent with the electrode, so that the contact resistance between the electrode and the carbon paper is reduced, and the accuracy of the final test result is high.
Drawings
FIG. 1 is an axial view of the test system apparatus of the present invention;
FIG. 2 is a right side view of the test system apparatus of the present invention;
FIG. 3 is a front view of the test system apparatus of the present invention;
FIG. 4 is an axial view of the table top of the test system of the present invention;
FIG. 5 is a left side view of the test system table of the present invention;
FIG. 6 is a schematic view of an electrode portion of the test system of the present invention;
FIG. 7 is a rear view of the test system apparatus of the present invention;
FIG. 8 is a schematic diagram of a test system software test interface of the present invention;
FIG. 9 is a schematic view of a test system software setup interface of the present invention;
FIG. 10 is a block diagram of the test system design architecture of the present invention;
FIG. 11 is a block diagram of the test system programming architecture design of the present invention;
FIG. 12 is a wiring diagram of the test system of the present invention under test;
FIG. 13 is a block diagram of the control logic of the lower computer of the test system of the present invention;
FIG. 14 is a graph of the results of a multi-pressure point test of the test system of the present invention for an un-surface treated aluminum metal bipolar plate;
FIG. 15 is a graph showing the results of a multi-pressure point test performed on a graphite bipolar plate using the test system of the present invention;
figure 16 is a graph of the results of a multi-pressure point test using a test system of the present invention for a surface coated TiN/Ag coated stainless steel bipolar plate.
In the figure, 1 is an actuating mechanism, 2 is a testing component, 3 is an adjustable bracket, 4 is a testing control cabinet, 5 is an emergency stop button, 6 is a manual control downward moving button, 7 is a manual control upward moving button, 8 is a manual control speed switching button, 9 is a system error indicating lamp, 10 is a system normal indicating lamp, 11 is a manual/automatic mode switching button, 12 is a power main switch, 13 is a control and communication module, 14 is a digital multimeter, 15 is a universal wheel, 16 is a motor, 17 is an electric cylinder, 18 is a pressure sensor, 19 is a flexible insulator, 20 is an electrode, 21 is a testing sample, 22 is an insulating pad, 23 is an insulating table top, 24 is a Z-axis supporting rod, 25 is a first adjustable connector, 26 is an X-axis supporting rod, 27 is a second adjustable connector, 28 is a Z-axis fixer, 29 is a connecting clamp, 30 is a clamp fastening screw, 31 is an adjustable clamp, 32 is an electrode body, 33 is a lead fastening through hole, 34 is a power supply interface, 35 is a control communication interface, 36 is a data acquisition interface, 37 is a cabinet body, 100 is upper computer control software, 101 is a test control interface, and 102 is a system setting interface.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments. Note that the following description of the embodiments is merely a substantial example, and the present invention is not intended to be limited to the application or the use thereof, and is not limited to the following embodiments.
Example 1
As shown in fig. 1 to 7, an automatic test system for a contact resistance curve of a bipolar plate of a fuel cell includes:
and (4) testing the control cabinet: comprises a test table for bearing a test sample 21 and a controller for controlling the operation of the system;
test part 2: the device comprises an electrode 20 for applying pressure to a test sample 21, a pressure sensor 18 for measuring the pressure between the electrode 20 and the test sample 21, and a digital multimeter 14 for measuring the resistance between the electrode 20 and the test sample 21, wherein the electrode 20 is fixed on a test table top and is driven by an actuating mechanism 1 to move along the vertical direction, the pressure sensor 18 is arranged on the electrode 20, the positive electrode and the negative electrode of the digital multimeter 14 are respectively and correspondingly connected with the electrode 20 and the test sample 21, and the electrode 20 is a gold-plated copper electrode in the embodiment;
the actuating mechanism 1: the actuating end is connected with an electrode 20, the driving electrode 20 moves along the vertical direction, and the pressure sensor 18 is connected between the actuating end of the actuating mechanism 1 and the electrode 20 in series;
the adjustable bracket 3: the adjustable electrode support is used for fixing the actuating mechanism 1 and adjusting the initial positions of the electrode 20 and the actuating mechanism 1 on the test table top, and the adjustable support 3 is fixed on the test table top;
The test table comprises an insulation table surface 23 body and an insulation backing plate 22, the insulation backing plate 22 is arranged on the insulation table surface 23 body, the insulation backing plate 22 is used for placing the test sample 21, the test electrode 20 and the test sample 21 are isolated from the external environment, and a passage between the positive electrode and the negative electrode of a test lead is ensured to be only between the electrode 20 and the test sample 21.
The flexible insulator 19 for buffering is connected in series between the electrode 20 and the actuating mechanism 1, and when the actuating mechanism 1 pressurizes the test sample 21, the flexible insulator 19 provides a buffer space for displacement, so that the closed-loop control precision and stability of pressure can be effectively improved.
The electrode 20 comprises an electrode body 32, a connecting clamp 29 and an adjustable clamp 31, wherein the connecting clamp 29 is fixed at the execution end of the execution mechanism 1 through a clamp fastening screw 30, the electrode body 32 is detachably fixed on the connecting clamp 29 through the adjustable clamp 31, and can be replaced by the electrode body 32 with required size, shape and material according to actual requirements, a lead fastening through hole 33 is reserved on the electrode body 32, and a bolt connecting hole is provided for tightly connecting a test lead and the electrode body 32.
The actuating mechanism 1 comprises a motor 16 and an electric cylinder 17, the motor 16 is connected with the electric cylinder 17, an output shaft of the electric cylinder 17 is connected with an electrode 20, and the electric cylinder 17 is fixed on the adjustable bracket 3.
The adjustable support comprises a Z-axis support rod 24 and an X-axis support rod 26, the Z-axis support rod is vertically fixed on the test table top through a Z-axis fixer 28, the X-axis support rod 26 is arranged parallel to the test table top, the middle part of the X-axis support rod is connected with the Z-axis support rod 24 through a first adjustable connector 25, the Z-axis support rod 24 can move in the horizontal direction and the vertical direction, and one end part of the X-axis support rod 26 is fixed on the actuating mechanism 1 through a second adjustable connector 27. The Z-axis holder 28, first adjustable connector 25 and second adjustable connector 27 are all pre-formed components, and the distance of the electrode 20 from the Z-axis support bar 24 and the test table top can be varied by adjusting the first adjustable connector 25 and second adjustable connector 27.
The controller includes the PLC controller, and the PLC controller has following function:
can realize the communication and control with the upper computer;
the displacement of the actuating mechanism 1 can be controlled, and the pressure of the actuating mechanism 1 is controlled in a closed loop manner;
there are two modes of manual control and automatic control;
there are two control modes, fast and slow;
the pressure data of the pressure sensor 18 and the resistance data of the digital multimeter 14 can be acquired simultaneously;
the current measuring mode and measuring range of the digital multimeter 14 can be set;
whether the current test system works normally or not can be detected, and corresponding indication is given.
The test control cabinet 4 comprises a cabinet body 37, universal wheels 15 are arranged at the bottom of the cabinet body 37, an emergency stop button 5, a manual control downward moving button 6, a manual control upward moving button 7, a manual control speed switching button 8, a system error indicating lamp 9, a system normal indicating lamp 10, a manual/automatic mode switching button 11, a power main switch 12 and a control and communication module 13 are arranged on the cabinet body 37, and the above components are all connected to the controller.
In addition, the system also comprises upper computer software 100, which comprises a test control interface 101 and a system setting interface 102.
As shown in fig. 8, the functional modules in the test control interface 101 include: a system state indicator light 103, a control communication indicator light 104, a data acquisition indicator light 105, a current control mode indicator light 106, a working state indicator light 107, a diameter setting module 108 of a test electrode 20, a carbon paper model information recording module 109, a sample model information recording module 110, a carbon paper contact resistance setting module 111, a carbon paper contact resistance manual input equation parameter module 112, a carbon paper contact resistance automatic fitting data input equation parameter module 113, a sample coating information recording module 114, a test pressure point setting module 115, a test pressure point initial value defining module 116, a test pressure point end value defining module 117, a test pressure point step length defining module 118, a pressure point sequence generating module 119, a test pressure point sequence visualization window module 120, an automatic test start control module 121, an automatic test forcible stop module 122, a user interface selection module 123, a current control mode indicator light 106, a working state indicator light 107, a test electrode 20, a test pressure point sequence visualization, The system comprises a setting interface selection module 124, a help interface selection module 125, a software closing module 126, a current test pressure value calculation and display module 127, a current resistance value display module 128, a current resistance value calculation and display module 129, a test data derivation module 130, a test result graph viewing module 131, a test result curve custom appearance module 132, a current test data real-time fitting exponential equation module 133 and a pressure-resistance curve real-time drawing and display module 134.
As shown in fig. 9, the carbon paper contact resistance setting module 111 may input the pre-measured information of the contact resistance between the carbon paper and the test electrode 20 into software for calculation of the test result output. After the carbon paper contact resistance parameters are input, the calculation result for automatically reducing the contact resistance between the carbon paper and the electrode 20 is generated in the derived data. The input mode of the carbon paper contact resistance is divided into two modes, and the amplitude coefficient a, the attenuation coefficient b and the offset c of the exponential equation can be defined in a manual input mode; the amplitude coefficient a, the attenuation coefficient b and the offset c of the exponential equation can also be automatically fitted and defined by importing a data file with the first column as the pressure and the second column as the resistance value.
The test sequence generation mode of the multi-pressure point has two modes, and the test sequence of the multi-pressure value can be generated by defining the initial value of the test pressure, the step value of the test pressure and the final value of the test pressure and clicking the mode of generating the test sequence. A freely defined test sequence can also be generated by importing a data file with the first column as pressure and the second column as resistance.
The automatic test start control module 121 may implement that the system sequentially maintains and collects the resistance value on each test point according to a defined test pressure sequence and from small to large, and then proceeds to the next test point. On each test point, the system automatically acquires thirty-two resistance values and pressure values, removes the maximum and minimum resistance values and pressure values of the thirty-two points, and then calculates the average value as the measured data of the test point.
The automatic test force-stop module 122 may cause the system to force an interruption of the test during the test and reset the test electrodes 20.
The current test pressure value calculation display module 127, the current resistance value display module 128 and the current resistance value calculation display module 129 can display three numerical values acquired or calculated by the pressure sensor 18 and the digital multimeter 14 in real time.
The pressure-resistance curve real-time rendering display module 134 may render the current test curve and the fitted curve fitting the test data in real time.
The real-time fitting exponential equation module 133 of the current test data can display the pressure-resistance fitting equation obtained by fitting when the number of data points is not less than three in real time, and can display the coefficients of the equation.
The test data deriving module 130 may automatically derive relevant test information, test results, and calculation results, which include: the method comprises the following steps of testing system name, testing date and time, diameter information of a testing electrode 20, carbon paper model information, carbon paper contact resistance equation amplitude coefficient information, carbon paper contact resistance equation attenuation coefficient information, carbon paper contact resistance equation offset coefficient information, sample model information, coating model information, actually measured pressure value, measured resistance value, set pressure value, carbon paper contact resistance calculation value and fitting and reducing carbon paper contact resistance calculation result.
The functions in the system setup interface 102 include: the system comprises a PLC IP address setting module 150, a PLC communication state indicating module 151, a digital multimeter 14 use port selection module 152, a digital multimeter 14 communication state indicating module 153, an electric cylinder 17 thrust threshold value setting module 154, a pressure fluctuation allowable value setting module 155, a pressure sensor 18 piezoelectric conversion coefficient k slope setting module 156, a pressure sensor 18 piezoelectric conversion coefficient b intercept setting module 157, an electric cylinder 17 moving speed setting module 158 in a manual mode, a current test pressure real-time display module 159 and a system alarm information display module 160.
The information recorded in the test result recording table includes: recording the name of a test system, recording the test date and time, recording the diameter information of the electrode 20 for test, recording the model information of carbon paper, recording the amplitude coefficient information of the equation of contact resistance of carbon paper, recording the attenuation coefficient information of the equation of contact resistance of carbon paper, recording the offset coefficient information of the equation of contact resistance of carbon paper, recording the model information of a sample, recording the model information of a coating, recording the actually measured pressure value, recording the measured resistance value, recording the set pressure value, recording the calculated value of the contact resistance of carbon paper, and fitting and reducing the calculated result of the contact resistance of carbon paper.
As shown in fig. 10, the test system of the present invention is a structural design diagram, and the system includes 3 parts, which are an upper computer software control system, an electrical control system and a mechanical test fixture, respectively, where the mechanical test fixture includes an electrode 20 (in this embodiment, a gold-plated copper electrode 20), the upper computer software control system is connected to the electrical control system, the electrical control system includes a PLC controller, and a servo electric cylinder and a pressure sensor 18 connected to the PLC controller, the PLC controller controls the movement of the servo electric cylinder and collects pressure data fed back by the pressure sensor 18, the pressure data is fed back to the upper computer software control system, and the upper computer software control system obtains a resistance value measured by the digital multimeter 14.
FIG. 11 is a block diagram of the design of the upper computer software program architecture of the test system of the present invention, which includes several parts:
1. communication between the digital multimeter 14 and the upper computer software: the digital multimeter 14 measures contact resistance and uploads data to an upper computer through RS-232 serial port communication;
2. the upper computer and the PLC carry out Ethernet TCP communication: the upper computer sends an instruction to the PLC controller, the PLC controller performs servo electric cylinder control, and the pressure sensor 18 collects pressure in real time to realize PID pressure control;
3. data analysis exponential fitting: the upper computer receives input carbon paper resistance fitting parameters (different contact resistances between different electrodes 20 and carbon paper are different, so that carbon paper resistance fitting needs to be carried out), the upper computer further completes fitting of the carbon paper contact resistance, and meanwhile, the upper computer completes fitting of contact resistance indexes of a sample to be tested in the real-time testing process;
4. visualization data display and import: the part carries out a look-up pressure test or a stepping pressure test and simultaneously displays a test result;
5. saving and exporting data: and the storage of the test data and the export of the CSV format file of the test data are realized.
As shown in fig. 12, an automatic test method for a contact resistance curve of a bipolar plate of a fuel cell, based on the automatic test system, comprises the following steps:
(1) placing the fuel cell bipolar plate to be tested on a test table, and aligning the position to be tested with the projection point of the electrode 20 on the insulating platform;
(2) the positive and negative leads of the digital multimeter 14 are correspondingly connected to the electrode 20 and the fuel cell bipolar plate through alligator clips;
(3) placing the cut carbon paper on a test point of the fuel cell bipolar plate, wherein the area of the carbon paper is larger than the projection area of the electrode 20 on the insulating platform;
(4) starting a controller, wherein the controller controls the actuating mechanism 1 to drive the electrode 20 to move downwards, and the contact resistance value is collected and stored at each set pressure point;
(5) fitting to obtain a first pressure-contact resistance curve f after data acquisition of all pressure points is completedep-cp/cp-bp(x) Which isIn which x is a pressure sequence, fep-cp/cp-bp(x) A first contact resistance value;
(6) the pre-fitted carbon paper pressure intensity-contact resistance curve f is adjustedep-cp(x)，fep-cp(x) The contact resistance value of the carbon paper and the electrode 20;
(7) obtaining a contact resistance curve of the bipolar plate of the fuel cell:
fcp-bp(x)＝fep-cp/cp-bp(x)-fep-cp(x)，
wherein f iscp-bp(x) Is the contact resistance of the fuel cell bipolar plate and the carbon paper.
And (4) for a single pressure point, acquiring contact resistance under the pressure point for multiple times, removing the maximum value and the minimum value, then averaging to obtain the contact resistance under the pressure point, and storing.
It is emphasized here that: after the first pressure-contact resistance curve is obtained in the step (5), the first contact resistance value corresponding to the corresponding pressure point in the curve includes the bulk resistance R of the gold-plated copper electrode 20eAnd the contact resistance R between the gold-plated copper electrode 20 and the carbon papere-cpBulk resistance R of carbon papercpContact resistance R between carbon paper and test sample 21cp-bpAnd the bulk resistance R of test specimen 21bpAs shown in FIG. 12, in the actual test, since Re、RcpAnd RbpIs generally much smaller than Re-cpAnd Rcp-bpSo that R can be considered in the calculatione、RcpAnd RbpApproximately equal to 0 and only need to eliminate Re-cpResulting in test errors. Thus, R is eliminated by the steps (6) and (7)e-cpResulting in test errors. Pre-fitted carbon paper pressure-contact resistance curve fep-cp(x) And the test is completed through a carbon paper contact resistance setting module 111, a carbon paper contact resistance manual input equation parameter module 112 and a carbon paper contact resistance automatic fitting data input equation parameter module 113, and specifically, the test number is obtainedAccording to the following steps: since the electrode 20 in this embodiment is a gold-plated copper electrode 20, the test is performed using a gold-plated copper plate as the test sample 21, and the contact resistance between the gold-plated copper electrode 20 and the carbon paper should be twice as high as the resistance value: 2Re-cpFurther, the contact resistance R between the gold-plated copper electrode 20 and the carbon paper can be calculatede-cpFitting the data to obtain a fitting equation fep-cp(x)。
In the testing process of the present embodiment, a table-lookup pressure test and a step-by-step test mode may be adopted, and the workflow block diagram is shown in fig. 13.
In this embodiment, the test sample 21 is an aluminum metal bipolar plate sample without surface treatment (the sample area is not smaller than the projection area of the gold-plated copper electrode 20 on the insulation platform), the test sample 21 is placed on the insulation platform, the test site is placed below the projection point of the gold-plated copper electrode 20, and the positive and negative electrodes of the wire are respectively connected to the gold-plated copper electrode 20 and the test sample 21 by a four-terminal-button connection method, and good contact is ensured. The carbon paper cut slightly larger than the boss at the top end of the gold-plated copper electrode 20 is placed on the bipolar plate, and the circle center of the carbon paper is placed below the projection point of the gold-plated copper electrode 20. And (4) starting the test software on the upper computer, and ensuring that the lower computer of the test system is well connected with the communication interface of the upper computer. And (3) starting testing system software in a computer, inputting the sample number, the coating number, the carbon paper model number, the resistance value fitting equation parameters of the carbon paper and the diameter (unit: mm) of the head of the testing electrode 20, setting a testing interval and interval step length, or manually importing a testing pressure point table to generate a testing sequence. Clicking the "automatic test" button, the device will run automatically. The gold-plated copper electrode 20 is moved downward by the drive of the electric cylinder 17, and the resistance value is held and collected at each set pressure point, and the collected resistance value is plotted in a map of a software interface, and data is recorded. And after the data acquisition of all the pressure points is finished, automatically fitting a pressure-contact resistance curve according to the data obtained by testing, and giving parameters of a fitting equation. And any pressure point can be conveniently selected in the whole test interval to obtain the corresponding contact resistance value. After the test is finished, the gold-plated copper electrode 20 is reset to the initial position to wait for the next test. All the parameters set in the test items, the test data, the fitted equations will be recorded in the data file and exported to the table file with the format of.csv. The test results in this example are shown in fig. 14.
Example 2
The automatic testing system and method for the contact resistance curve of the fuel cell bipolar plate in this embodiment are the same as those in embodiment 1, the test sample in this embodiment is a graphite bipolar plate, the test result is shown in fig. 15, and the specific testing method is as follows:
placing a graphite bipolar plate sample to be tested (the sample area is not less than the projection area of a gold-plated copper electrode on an insulation platform) on the insulation platform, placing a test site below the projection point of the gold-plated copper electrode, and respectively connecting the positive electrode and the negative electrode of a lead on the gold-plated copper electrode and the test sample by using a four-terminal button connection method to ensure good contact. The carbon paper which is cut to be slightly larger than the lug boss at the top end of the gold-plated copper electrode is placed on the bipolar plate, and the circle center of the carbon paper is placed below the projection point of the gold-plated copper electrode. And (4) starting the test software on the upper computer, and ensuring that the lower computer of the test system is well connected with the communication interface of the upper computer. And (3) starting testing system software in a computer, inputting the number of a currently tested sample, the number of a coating, the type of the carbon paper, the parameter of a resistance value fitting equation of the carbon paper and the diameter (unit: mm) of a testing electrode tip, setting a testing interval and an interval step length, or manually introducing a testing pressure point table to generate a testing sequence. Clicking the "automatic test" button, the device will run automatically. The gold-plated copper electrode is driven by the electric cylinder to move downwards, the resistance value is kept and collected at each set pressure point, the collected resistance value is drawn in a graph of a software interface, and data are recorded. And after the data acquisition of all the pressure points is finished, automatically fitting a pressure-contact resistance curve according to the data obtained by testing, and giving parameters of a fitting equation. And any pressure point can be conveniently selected in the whole test interval to obtain the corresponding contact resistance value. And after the test is finished, the gold-plated copper electrode is reset to the initial position to wait for the next test. All the parameters set in the test items, the test data, the fitted equations will be recorded in the data file and exported to the table file with the format of.csv.
Example 3
The automatic testing system and method for the contact resistance curve of the fuel cell bipolar plate in this embodiment are the same as those in embodiment 1, the test sample in this embodiment is a stainless steel bipolar plate with a TiN/Ag coating on the surface, the test result is shown in fig. 16, and the specific testing method is as follows: placing a stainless steel bipolar plate sample (the sample area is not less than the projection area of a gold-plated copper electrode on an insulation platform) with a TiN/Ag coating on the surface to be tested on the insulation platform, placing a test site below the projection point of the gold-plated copper electrode, and respectively connecting the positive electrode and the negative electrode of a lead on the gold-plated copper electrode and the test sample by using a four-terminal button connection method to ensure good contact. The carbon paper which is cut to be slightly larger than the lug boss at the top end of the gold-plated copper electrode is placed on the bipolar plate, and the circle center of the carbon paper is placed below the projection point of the gold-plated copper electrode. And (4) starting the test software on the upper computer, and ensuring that the lower computer of the test system is well connected with the communication interface of the upper computer. And (3) starting testing system software in a computer, inputting the number of a currently tested sample, the number of a coating, the type of the carbon paper, the parameter of a resistance value fitting equation of the carbon paper and the diameter (unit: mm) of a testing electrode tip, setting a testing interval and an interval step length, or manually introducing a testing pressure point table to generate a testing sequence. Clicking the "automatic test" button, the device will run automatically. The gold-plated copper electrode is driven by the electric cylinder to move downwards, the resistance value is kept and collected at each set pressure point, the collected resistance value is drawn in a graph of a software interface, and data are recorded. And after the data acquisition of all the pressure points is finished, automatically fitting a pressure-contact resistance curve according to the data obtained by testing, and giving parameters of a fitting equation. And any pressure point can be conveniently selected in the whole test interval to obtain the corresponding contact resistance value. And after the test is finished, the gold-plated copper electrode is reset to the initial position to wait for the next test. All the parameters set in the test items, the test data, the fitted equations will be recorded in the data file and exported to the table file with the format of.csv.
In conclusion, the invention can simply, reliably, efficiently, accurately and reproducibly measure the contact resistance of the single side of the bipolar plate of the fuel cell.
The above embodiments are merely examples and do not limit the scope of the present invention. These embodiments may be implemented in other various manners, and various omissions, substitutions, and changes may be made without departing from the technical spirit of the present invention.
Claims (10)
1. An automatic test system for a contact resistance curve of a bipolar plate of a fuel cell, the system comprising:
test control cabinet (4): comprises a test table for carrying a test sample (21) and a controller for controlling the operation of the system;
test part (2): the device comprises an electrode (20) for applying pressure to a test sample (21), a pressure sensor (18) for measuring the pressure between the electrode (20) and the test sample (21), and a digital multimeter (5) for measuring the resistance between the electrode (20) and the test sample (21), wherein the electrode (20) is fixed on a test table top and is driven to move along the vertical direction by an actuating mechanism (1), the pressure sensor (18) is arranged on the electrode (20), and the positive electrode and the negative electrode of the digital multimeter (5) are respectively and correspondingly connected with the electrode (20) and the test sample (21);
actuator (1): the actuating end is connected with an electrode (20), the driving electrode (20) moves along the vertical direction, and the pressure sensor (18) is connected between the actuating end of the actuating mechanism (1) and the electrode (20) in series;
adjustable support (3): the adjustable support (3) is fixed on the test table top and used for fixing the actuating mechanism (1) and adjusting the initial positions of the electrode (20) and the actuating mechanism (1) on the test table top;
the pressure sensor (18), the digital multimeter (5) and the actuating mechanism (1) are all connected to the controller.
2. The system for automatically testing the contact resistance curve of the fuel cell bipolar plate as set forth in claim 1, wherein the test table comprises an insulating table body (23) and an insulating pad (22), the insulating pad (22) is disposed on the insulating table body (23), and the insulating pad (22) is used for placing the test specimen (21).
3. The automatic test system for the contact resistance curve of the fuel cell bipolar plate according to claim 1, characterized in that a flexible insulator (19) for buffering is connected in series between the electrode (20) and the actuator (1).
4. The automatic test system for the contact resistance curve of the fuel cell bipolar plate as claimed in claim 1, wherein the electrode (20) comprises an electrode body (32), a connecting clamp (29) and an adjustable clamp (31), the connecting clamp (29) is fixed on the execution end of the execution mechanism (1) through a clamp fastening screw (30), and the electrode body (32) is detachably fixed on the connecting clamp (29) through the adjustable clamp (31).
5. The system for automatically testing the contact resistance curve of the fuel cell bipolar plate according to claim 1, wherein the actuating mechanism (1) comprises an electric motor (16) and an electric cylinder (17), the electric motor (16) is connected with the electric cylinder (17), the output shaft of the electric cylinder (17) is connected with the electrode (20), and the electric cylinder (17) is fixed on the adjustable bracket (3).
6. The automatic test system for contact resistance curve of fuel cell bipolar plate according to claim 1, wherein the adjustable support comprises a Z-axis support bar (24) and an X-axis support bar (26), the Z-axis support bar is vertically fixed on the test table by a Z-axis fixer (28), the X-axis support bar (26) is arranged parallel to the test table, the middle part of the X-axis support bar is connected with the Z-axis support bar (24) by a first adjustable connector (25), the Z-axis support bar (24) can move horizontally and vertically, and one end of the X-axis support bar (26) is fixed on the actuator (1) by a second adjustable connector (27).
7. The automatic test system for the contact resistance curve of the fuel cell bipolar plate as claimed in claim 1, wherein the test control cabinet (4) is provided with a switching button for switching between a manual mode and an automatic mode and a control button for manually controlling the operation of the actuator (1), and the switching button and the control button are both connected to a controller.
8. The system of claim 1, wherein the controller comprises a PLC controller.
9. An automatic test method for a contact resistance curve of a bipolar plate of a fuel cell, which is based on the automatic test system of any one of claims 1 to 8, and which comprises the steps of:
(1) placing a fuel cell bipolar plate to be tested on a test table, and aligning the position to be tested with a projection point of an electrode on an insulating platform;
(2) positive and negative leads of the digital multimeter are correspondingly connected to the electrodes and the fuel cell bipolar plate through alligator clips;
(3) placing the cut carbon paper on a test point of a bipolar plate of the fuel cell, wherein the area of the carbon paper is larger than the projection area of an electrode on an insulating platform;
(4) starting a controller, wherein the controller controls an actuating mechanism to drive the electrode to move downwards, and a contact resistance value is collected and stored at each set pressure point;
(5) fitting to obtain a first pressure-contact resistance curve f after data acquisition of all pressure points is completedep-cp/cp-bp(x) Where x is a pressure sequence, fep-cp/cp-bp(x) A first contact resistance value;
(6) the pre-fitted carbon paper pressure intensity-contact resistance curve f is adjustedep-cp(x)，fep-cp(x) The contact resistance value of the carbon paper and the electrode is shown;
(7) obtaining a contact resistance curve of the bipolar plate of the fuel cell:
fcp-bp(x)＝fep-cp/cp-bp(x)-fep-cp(x)，
wherein f iscp-bp(x) Is the contact resistance of the fuel cell bipolar plate and the carbon paper.
10. The method of claim 9, wherein the step (4) is performed for a single pressure point, the contact resistance is collected for a plurality of times under the pressure point, and the average value is obtained after the maximum value and the minimum value are removed, and the contact resistance value under the pressure point is stored.
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| CN201911260965.3A CN111141959A (en) | 2019-12-10 | 2019-12-10 | Automatic test system and method for contact resistance curve of bipolar plate of fuel cell |
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| CN201911260965.3A CN111141959A (en) | 2019-12-10 | 2019-12-10 | Automatic test system and method for contact resistance curve of bipolar plate of fuel cell |
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| CN112611918A (en) * | 2020-11-27 | 2021-04-06 | 深圳市昆龙卓盈机电有限公司 | Test equipment for contact resistance of bipolar plate |
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| CN112611918A (en) * | 2020-11-27 | 2021-04-06 | 深圳市昆龙卓盈机电有限公司 | Test equipment for contact resistance of bipolar plate |
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