CN206387820U - A device for ensuring the consistency of the detection position of the fuel cell bipolar plate contact resistance - Google Patents

Abstract

The utility model provides a guarantee device of fuel cell bipolar plate contact resistance detection position uniformity, includes bipolar plate contact resistance measuring device and positioning detection board, and positioning detection board is that center department opens the circular slot that has fixed detection head gilt copper billet and link up the board of the rectangular channel of positioning detection board length, and positioning detection board is fixed on tensile testing machine's lower tensile bench with the bolt, and another detection head gilt copper billet fixed mounting is on tensile testing machine's last tensile bench. During detection, the bipolar plate to be detected is placed on the positioning detection plate, the bipolar plate is fixed by the four positioning rods, and the bipolar plate is detected by the bipolar plate contact resistance measuring device. The beneficial effects are that: the consistency of the measurement positions of the contact resistance of the metal bipolar plate is ensured, the measured contact resistance has comparability, the detection position error is avoided, and the consistency of the output of the assembled fuel cell stack is ensured; the working efficiency is improved, and the cost is saved; the detection device is simple in structure and operation and visual in display.

Description

A device for ensuring the consistency of the detection position of the fuel cell bipolar plate contact resistance

technical field

The utility model belongs to the technical field of fuel cells, in particular to a detection technology for the contact resistance of bipolar plates of proton exchange membrane fuel cells.

Background technique

There are many bipolar plates in series in the fuel cell stack (usually more than 100). After the stack is assembled, the contact resistance of the bipolar plates directly affects the overall output efficiency of the stack, which in turn affects the consistency of the fuel cell output.

In the prior art, the method for measuring the contact resistance of bipolar plates is: before assembling the fuel cell stack, measure the contact resistance value of each bipolar plate, and then select bipolar plates with consistent contact resistance and small resistance to form the same battery. heap. The disadvantages of the prior art are: the position of each bipolar plate to measure the contact resistance is not fixed, and the contact resistance measured by each bipolar plate is not the contact resistance at the same position, so the contact resistance at the same position cannot be selected. bipolar plates. There is no comparison of the resistance values between plates at the same position, and its shortcoming is that bipolar plates with consistent contact resistance cannot be screened out, which affects the output efficiency of the stack.

Contents of the invention

The purpose of the utility model is to provide a fuel cell bipolar plate contact resistance detection device, to ensure that the contact resistance of each bipolar plate is measured at the same position, and to ensure the consistency of the measurement position of the contact resistance of each bipolar plate.

The technical scheme of the utility model is: a device for ensuring the consistency of the detection position of the fuel cell bipolar plate contact resistance, including a bipolar plate contact resistance measurement device, the bipolar plate contact resistance measurement device includes a tensile testing machine, two detection Head and resistance detection mechanism, the detection head is a gold-plated copper block, the contact surface between the detection head and the bipolar plate is covered with carbon paper, the resistance detection mechanism includes a high-precision constant current source, a voltage sensor and a display screen, and the resistance detection mechanism is connected to the gold-plated copper block , it is characterized in that: the device for ensuring the consistency of the detection position of the contact resistance of the bipolar plate of the fuel cell also includes a positioning detection board, the positioning detection board is a rectangular flat plate, and a gold-plated copper fixed detection head is opened at the center of the flat plate. The round groove of the block, the depth of the round groove is d, 2/3 of the height of the gold-plated copper block ≤ d ≤ the height of the gold-plated copper block, there is a rectangular groove running through the length of the plate along the center line of the plate length direction on the top of the plate, the rectangular groove It is as deep as the circular groove at the center of the plate, and there are two fixed through holes on the surface of the edge of the circular groove, and the two fixed through holes are arranged symmetrically along the wall of the circular groove with the rectangular groove as the symmetrical axis. Four positioning holes, the positioning holes correspond to the positioning holes at the four corners of the bipolar plate to be tested, the four positioning rods (5) are fixed in the positioning holes, the bottom of the positioning detection plate is a plane, and the positioning detection plate is passed through by bolts The two fixed through holes on the positioning detection board fix the positioning detection board on the lower tensile tester of the testing tensile testing machine, and the gold-plated copper block of the detection head is fixed in the circular groove on the positioning detection board, with carbon paper One side is facing up, and the gold-plated copper block of the other detection head is fixedly installed on the upper tension table of the detection tensile testing machine, and the side with carbon paper is facing down, and the position is the same as that of the lower tensile testing machine fixed on the detection tensile testing machine. The gold-plated copper block of the detection head in the circular groove on the positioning detection board on the stage is opposite, and the cable of the resistance detection mechanism is placed in the rectangular groove on the positioning detection board.

The device for ensuring the consistency of the detection position of the fuel cell bipolar plate contact resistance described in the utility model is characterized in that: the fixing method of fixing the gold-plated copper block of the detection head in the circular groove on the positioning detection plate is Glue the gold-plated copper block of the probe to the circular groove on the positioning detection board.

A method of using a device for ensuring the consistency of the detection position of the fuel cell bipolar plate contact resistance described in the utility model includes the following steps:

1) Place the bipolar plate to be detected on the positioning detection board, and fix the bipolar plate with four positioning rods, so that the bipolar plate to be detected is in contact with the gold-plated copper block of the probe in the circular groove on the positioning detection board;

2) Operate the detection tensile testing machine to make the gold-plated copper block of the detection head on the upper tensile table contact with the bipolar plate to be detected, and gradually increase the pressure to make the gold-plated copper block of the detection head on the upper and lower tensile table of the detection tensile testing machine contact with the bipolar plate to be tested. The copper block is fully in contact with the bipolar plate, so as not to crush the carbon paper;

3) Adjust the parameters of the high-precision constant current source, and read the measured voltage value on the display screen.

The beneficial effects of the utility model are:

1. Ensure the consistency of the measurement position of the metal bipolar plate contact resistance, make the measured metal bipolar plate contact resistance comparable, avoid the detection position error caused by artificially placing the bipolar plate, and ensure the consistency of the output of the assembled fuel cell stack sex;

2. Avoid the problem of replacing incompatible bipolar plates during the operation of fuel cells, improve operating efficiency and save costs;

3. The structure and operation of the detection device are simple, and the display is intuitive.

Description of drawings

Fig. 1 is a schematic diagram of a tool for detecting the consistency of contact resistance of a fuel cell bipolar plate according to the present invention.

Fig. 2 is a schematic diagram of a positioning detection board.

In the figure 1. Round groove, 2. Fixed through hole, 3. Rectangular groove, 4. Positioning hole, 5. Positioning rod, 6. Bipolar plate to be tested, 7. Tensile testing machine, 8. Gold-plated copper block, 9 , High-precision constant current source, 10, positioning detection board.

detailed description

Below in conjunction with accompanying drawing and embodiment the utility model is described further.

A device for ensuring the consistency of the detection position of the fuel cell bipolar plate contact resistance, comprising a bipolar plate contact resistance measurement device and a positioning detection board 10, the bipolar plate contact resistance measurement device includes a tensile testing machine 7, two detection heads and Resistance detection mechanism, the detection head is a gold-plated copper block 8, with carbon paper on the contact surface between the gold-plated copper block 8 and the bipolar plate, the resistance detection mechanism includes a high-precision constant current source, a voltage sensor and a display screen, the resistance detection mechanism and the gold-plated copper block Connected, the positioning detection board 10 is a rectangular flat plate, and there is a round groove 1 of a gold-plated copper block for fixing the detection head at the center of the upper plate. The depth of the round groove 1 is d, and 2/3 of the height of the gold-plated copper block≤d≤gold-plated The height of the copper block. There is a rectangular groove 3 running through the length of the plate along the center line of the plate length direction on the top of the plate. The rectangular groove 3 is as deep as the circular groove 1 at the center of the plate. Fixed through holes 2, two fixed through holes 2 are symmetrically arranged along the wall of the circular groove with the rectangular groove 3 as the symmetrical axis, four positioning holes 4 are arranged at the four corners of the plate, and the positioning holes 4 are aligned with the bipolar plate 6 to be detected. The positioning holes at the two corners correspond to each other, and the four positioning rods 5 are fixed in the positioning holes 4. The bottom of the positioning detection plate 10 is a plane. The positioning detection board 10 is fixed on the lower tensile platform of the detection tensile testing machine, the gold-plated copper block 8 of the detection head is glued into the circular groove 1 on the positioning detection board 10, and the side with the carbon paper faces upwards, The gold-plated copper block 8 of the other detection head is fixedly installed on the upper tensile table of the detection tensile testing machine, with the side of the carbon paper facing down, and the position is fixed on the lower tensile table of the detection tensile testing machine for positioning detection The gold-plated copper block 8 of the detection head in the circular groove 1 on the board 10 is opposite, and the cable of the resistance detection mechanism is placed in the rectangular groove 3 on the positioning detection board 10 .

The detection steps are as follows:

1) Place the bipolar plate 6 to be detected on the positioning detection plate 10, and fix the bipolar plate to be detected with four positioning rods 5, so that the bipolar plate 6 to be detected and the measuring head in the circular groove on the positioning detection plate 10 Gold-plated copper block 8 contacts;

2) Operate the detection tensile testing machine to make the gold-plated copper block 8 of the detection head on the upper stretching table contact with the bipolar plate 6 to be detected, and gradually increase the pressure to make the detection head on the upper and lower stretching table of the detection tensile testing machine The gold-plated copper block is in full contact with the bipolar plate, so as not to crush the carbon paper;

3) Adjust the parameters of the high-precision constant current source, and read the measured voltage value on the display screen.

Using the device of the utility model to ensure the consistency of the detection position of the fuel cell bipolar plate contact resistance to detect 20 bipolar plates, the measured data are as follows:

Claims (2)

1. a kind of device for ensureing fuel battery double plates contact resistance test position uniformity, including bipolar plates contact resistance are surveyed Device is measured, bipolar plates measuring contact resistance device includes cupping machine (7), two detection heads and resistance detection mechanism, detection Head is gold-plated copper billet (8), and gold-plated copper billet (8) carries carbon paper with bipolar plates contact surface, and resistance detection mechanism includes high precision constant current Source, voltage sensor and display screen, resistance detection mechanism are connected with gold-plated copper billet, it is characterised in that:The guarantee fuel cell The device of bipolar plates contact resistance test position uniformity also includes one piece of detection and localization plate (10), the detection and localization plate (10) It is the circular groove (1) of the gold-plated copper billet that center is provided with fixed test head above one piece of rectangular flat, flat board, the depth of circular groove (1) Spend for d, the height of 2/3≤d≤gold-plated copper billet of gold plated copper tile height, be provided with above flat board along slab length direction center line The rectangular channel (3) of one insertion slab length, rectangular channel (3) and washer center circular groove (1) etc. are deep, circular groove (1) edge Face on be provided with two fixed vias (2), two fixed vias (2) are along circular groove wall with rectangular channel (3) for symmetrical axial symmetry cloth Put, provided with four positioning holes (4) at four angles of washer, positioning hole (4) and the positioning at (6) four angles of bipolar plates to be detected Hole is corresponding, and four locating rods (5) are fixed in positioning hole (4), are plane, detection and localization plate below detection and localization plate (10) (10) detection and localization plate (10) is fixed on detection stretching by two fixed vias (2) on detection and localization plate (10) with bolt On the lower drawing stand of testing machine, the gold-plated copper billet (8) of detection head is fixedly mounted on the circular groove (1) on detection and localization plate (10) Nei, There is the one side of carbon paper upward, the gold-plated copper billet (8) of another detection head is fixedly mounted on the upper drawing stand of detection cupping machine, Have the one of carbon paper down, position and be fixed on the lower drawing stand of detection cupping machine circular groove on detection and localization plate (10) (1) the gold-plated copper billet (8) of the detection head in relatively, the rectangular channel that the cable of resistance detection mechanism is placed on detection and localization plate (10) (3) in.

2. a kind of device for ensureing fuel battery double plates contact resistance test position uniformity as claimed in claim 1, it is special Levy and be:The fixation side gold-plated copper billet (8) of detection head being fixedly mounted in the circular groove (1) on detection and localization plate (10) Method is that the gold-plated copper billet (8) of gauge head is bonded in the circular groove (1) on detection and localization plate (10) Nei with glue.