CN222105548U - Contact resistance testing device - Google Patents

Abstract

The utility model discloses a contact resistance testing device which comprises a base, a sample fixing piece, electrodes and the electrodes, wherein the sample fixing piece is movably arranged on the base and used for horizontally placing a test sample and fixing the edge of the sample, the electrodes are arranged on the base and comprise an upper electrode and a lower electrode, and the upper electrode and the lower electrode are respectively arranged on the upper side and the lower side of the sample fixing piece and used for being driven to move towards each other to be in contact with the upper surface and the lower surface of the sample for testing. The utility model can ensure the levelness of the sample, optimize the level difference between the sample and the electrode, lead the fixed state of the sample to be more stable, solve the problems of large testing difficulty and easy bending deformation caused by oversized sample size, be applicable to the testing requirements of samples with different sizes, lead the testing accuracy and the result consistency to reach higher level, and have simple and convenient operation and high efficiency.

Description

Contact resistance testing device

Technical Field

The utility model relates to the technical field of resistance testing, in particular to a contact resistance testing device.

Background

The size of the contact resistance of the bipolar plate with the gas diffusion layer, which is one of the most important components in proton exchange membrane fuel cells (proton exchange membrane fuel cell, PEMFC), directly affects the efficiency and output performance of the cell. When a large contact resistance exists on the surface of the bipolar plate, the performance of the battery is reduced and the service life of the battery is shortened. Therefore, when the contact resistance test is carried out on the bipolar plate, the accuracy and consistency of the contact resistance test of the bipolar plate are improved, and the method has important significance.

At present, in the bipolar plate contact resistance test process, a sample is generally placed in a handheld mode aiming at a bipolar plate test sample with a smaller size, and the sample is kept fixed by only relying on the pressure action between an upper test electrode tip and a lower test electrode tip, so that the sample is easy to shake in the test process, the levelness between the sample and the electrode tip is poor, and the consistency and the repeatability of a test result are difficult to ensure. For bipolar plates with larger sizes, the two side ends of the bipolar plate are easy to bend and deform under the action of gravity, so that the testing difficulty is increased, and the problem of sample damage is easily caused. Moreover, even if the bipolar plate is in a horizontally fixed state, it is difficult to always remain stable. These problems all lead to poor consistency of test results and thus affect the accuracy of the test. In addition, when conversion between different test points of a sample is required, the conversion speed is also slower, so that the test efficiency is lower.

Disclosure of utility model

The utility model aims to overcome the defects in the prior art and provide a contact resistance testing device.

In order to achieve the above purpose, the technical scheme of the utility model is as follows:

the utility model provides a contact resistance testing device, comprising:

A base;

The sample fixing piece is movably arranged on the base and is used for horizontally placing a test sample and fixing the edge of the sample;

The electrode is arranged on the base and comprises an upper electrode and a lower electrode, and the upper electrode and the lower electrode are respectively arranged on the upper side and the lower side of the sample fixing piece and used for being driven to move oppositely to be in contact with the upper surface and the lower surface of the sample for testing.

Further, the sample holder includes a frame-shaped clamping portion for clamping at least two opposing sides of the sample to secure the sample at different sizes.

Further, the clamping part comprises a frame-shaped upper clamping part and a frame-shaped lower clamping part which are matched, and the clamping part is used for clamping and fixing at least two opposite side parts of the sample from the upper side and the lower side respectively.

Further, the upper clamping part and the lower clamping part are rectangular frames and are movably connected through one corresponding side edge of each rectangular frame.

Further, a translation guide mechanism is arranged on the base, the sample fixing piece is arranged on the translation guide mechanism, and the translation guide mechanism is used for enabling the sample fixing piece to translate along a first direction or along a second direction orthogonal to the first direction when the sample fixing piece is driven.

Further, the translation guiding mechanism comprises a first translation guiding sub-mechanism and a second translation guiding sub-mechanism, the first translation guiding sub-mechanism comprises a first sliding rail and a first sliding block which are matched with each other, the second translation guiding sub-mechanism comprises a second sliding rail and a second sliding block which are matched with each other, the first sliding rail is arranged on the base along the first direction, a first connecting piece is arranged on the first sliding block, the second sliding rail is arranged on the first connecting piece along the second direction, the sample fixing piece is horizontally connected on the second sliding block, and an avoidance groove for avoiding the lower electrode is formed in the surface of the first connecting piece.

Further, the lower electrode is arranged on the surface of the base, a second connecting piece is arranged on the base, the upper electrode is arranged on the second connecting piece, the upper electrode is connected with the second connecting piece through a first lifting mechanism, the lower electrode is connected with the base through a second lifting mechanism, and a pressure sensing unit is further arranged between the upper electrode and the first lifting mechanism or between the lower electrode and the second lifting mechanism.

Further, the device also comprises a pressure display unit and a resistance detection unit, wherein the pressure sensing unit is in signal connection with the pressure display unit, and the resistance detection unit is in signal connection with the upper electrode and the lower electrode.

Further, the device also comprises a handle which is arranged on the sample fixing piece and the first connecting piece respectively.

Further, the test bench comprises a test bench body, wherein the base, the pressure display unit and the resistance detection unit are arranged on the test bench body.

According to the technical scheme, the sample fixing piece is arranged between the upper electrode and the lower electrode and used for placing the test sample, so that the levelness of the sample can be guaranteed, the level difference between the sample and the electrode is optimized, the fixing state of the sample is more stable, the problem of large testing difficulty and easy bending deformation caused by overlarge sample size can be solved by fixing the edge of the sample, the test device can be suitable for testing requirements of samples with different sizes, the testing accuracy and the result consistency can reach higher level, and in addition, the sample fixing piece is designed to be moved, the rapid conversion between different test points of the sample can be met by moving the sample fixing piece, so that the test operation is convenient, and the test efficiency is obviously improved.

Drawings

FIG. 1 is a schematic diagram of a contact resistance testing device according to a preferred embodiment of the present utility model.

Fig. 2 is a schematic structural view of a translation guide according to a preferred embodiment of the present utility model.

Fig. 3 is a schematic view of an electrode arrangement structure according to a preferred embodiment of the utility model.

FIG. 4 is a schematic diagram showing the operation of a contact resistance testing apparatus on a test bench according to a preferred embodiment of the utility model.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions in the embodiments of the present utility model will be clearly and completely described below, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model. Unless otherwise defined, technical or scientific terms used herein should be given the ordinary meaning as understood by one of ordinary skill in the art to which this utility model belongs. As used herein, the word "comprising" and the like means that elements or items preceding the word are included in the element or item listed after the word and equivalents thereof without precluding other elements or items.

The following describes the embodiments of the present utility model in further detail with reference to the drawings.

Reference is made to fig. 1-3. The utility model relates to a contact resistance testing device, which comprises a base 10, a sample fixing piece 12 and an electrode 13.

Wherein the sample holder 12 is movably disposed on the base 10. The sample holder 12 is used to horizontally place the test sample 200 and hold the side of the sample 200.

The electrode 13 is provided on the base 10. The electrode 13 includes an upper electrode 131 and a lower electrode 132, and the upper electrode 131 and the lower electrode 132 are disposed in a vertically opposite direction and are disposed on the upper and lower sides of the sample holder 12, respectively. The upper electrode 131 and the lower electrode 132 are movable in opposite directions up and down when driven, and are moved to contact with the upper and lower surfaces of the sample 200, thereby establishing electrical connection with the sample 200 to test the contact resistance characteristics of the sample 200.

Reference is made to fig. 1-3. In some embodiments, the sample fixing member 12 is flat and horizontally arranged relative to the base 10, so that the sample 200 placed on the sample fixing member 12 is also in a horizontal state, thereby ensuring the perpendicularity between the surface of the sample 200 and the electrode 13, optimizing the level difference between the sample 200 and the electrode 13, and further improving the stability of the test result.

In some embodiments, the sample holder 12 includes a frame-shaped grip 121. The clamping part 121 is used for clamping at least two opposite side parts of the sample 200 to fix the sample 200 in different sizes.

Taking sample 200 as a bipolar plate, a contact resistance testing device of the present utility model is used to test the contact resistance of the bipolar plate sample 200, and the bipolar plate is generally rectangular sheet-shaped. The dimension difference between bipolar plates of different sizes is mainly represented by the difference in length along the length direction. Therefore, the clamping portion 121 of the sample holder 12 can be designed as a rectangular frame type clamping portion 121, and at least two opposite side portions of the rectangular bipolar plate can be clamped and fixed by two opposite long sides of the rectangular frame provided in the clamping portion 121. The length and width dimensions of the sample holder 12 are set to fit (i.e., clamp and hold the four sides of the largest bipolar plate) with the largest bipolar plate of the known samples 200 to be tested. For a relatively small-sized bipolar plate sample 200, two opposite sides of a small-sized bipolar plate and one side therebetween (i.e., three sides) may be clamped and secured by the clamping portion 121 of the sample holder 12. In this way, smooth placement and effective securement of the bipolar plate is achieved by the sample holder 12 as the dimension of the bipolar plate sample 200 increases along the length of the sample holder 12.

In some embodiments, the clamping portion 121 of the sample holder 12 comprises a frame-shaped upper clamping portion and a frame-shaped lower clamping portion that are in overlapping engagement for clamping and securing at least two opposing edges of the sample 200 from the upper and lower sides, respectively. For example, by providing the upper clamping portion and the lower clamping portion of the rectangular frame shape, the rectangular bipolar plate sample 200 can be horizontally placed on the lower clamping portion, at least two opposite side portions (preferably three side portions) of the bipolar plate sample 200 are lapped on the corresponding side frames of the lower clamping portion, and the upper clamping portion is correspondingly pressed on the bipolar plate sample 200, so that the bipolar plate sample 200 is clamped and fixed up and down, that is, the clamping effect is realized by relatively approaching the side frames of the upper clamping portion and the side frames of the lower clamping portion, and the problems that the accuracy of a test result is affected due to running, shaking and the like of the bipolar plate sample 200 in the process of moving along with the sample fixing member 12 are effectively prevented.

In some embodiments, the upper and lower clamping portions are movably connected by a corresponding side (rim) of the respective rectangular frame. For example, one frame of the upper clamping part is connected with one frame of the corresponding side of the lower clamping part through a hinge, so that the upper clamping part and the lower clamping part form a hinge type structure. When the bipolar plate sample 200 needs to be placed, the upper clamping part can be turned over from the lower clamping part, the bipolar plate sample 200 can be placed on the corresponding frame of the lower clamping part, and then the upper clamping part is put down, so that the bipolar plate sample 200 can be pressed on the lower clamping part to be fixed by utilizing gravity. Fastening structures (e.g., snaps, etc.) may also be added between the upper and lower clamping portions to provide a more secure clamping of the bipolar plate sample 200.

If the dimension of the bipolar plate sample 200 is larger than the frame dimensions of the upper clamping part and the lower clamping part, the situation that the parts with larger dimensions on the bipolar plate sample 200 extend out from the edges of the upper clamping part and the lower clamping part can be solved by additionally arranging telescopic supporting arms on the side surfaces of the lower clamping part, so that the test requirements of the bipolar plate sample 200 with different dimensions including larger dimensions can be well met.

Reference is made to fig. 1-3. In some embodiments, the base 10 is provided with a translation guide 11, and the sample holder 12 is provided on the translation guide 11. The translation guide 11 is used to translate the sample holder 12 in a first direction or in a second direction orthogonal to the first direction when the sample holder 12 is driven.

In some embodiments, the translation guide 11 includes a first translation guide sub-mechanism and a second translation guide sub-mechanism. The first translation guiding sub-mechanism comprises a first sliding rail 114 and a first sliding block 115 which are matched, and the second translation guiding sub-mechanism comprises a second sliding rail 113 and a second sliding block which are matched. The first sliding rail 114 is horizontally disposed on the base 10 along the first direction, and the first slider 115 is provided with a first connecting member. The second slide rail 113 is horizontally disposed on the first connecting member along the second direction, and the sample fixing member 12 is horizontally connected to a second slider (not shown).

In some embodiments, the first slide rail 114 employs parallel slide rails. The second slide rail 113 is a single slide rail or a parallel slide rail.

In some embodiments, the first connector includes a first sub-connector 111 and a second sub-connector 112. The first sub-connector 111 is disposed horizontally and connected to the first slider 115. The second sub-connector 112 is vertically disposed on the first sub-connector 111, and the second slide rail 113 is disposed on the second sub-connector 112 and is spaced apart from the surface of the first sub-connector 111 by a suitable distance to ensure that the sample holder 12 has a sufficient moving space.

Reference is made to fig. 1-3. In some embodiments, the lower electrode 132 is disposed on the surface of the base 10, and the test end of the lower electrode 132 is disposed vertically upward. The base 10 is further provided with a second connecting piece 102, the second connecting piece 102 is vertically arranged on the base 10, the upper electrode 131 is arranged on the second connecting piece 102, and the testing end of the upper electrode 131 is vertically downwards arranged and aligned with the testing end of the lower electrode 132.

In some embodiments, the first sub-connector 111 and the second sub-connector 112 are plate-shaped.

In some embodiments, the second connecting member 102 is a bracket structure, and the upper electrode 131 is suspended on the bracket structure of the second connecting member 102.

In some embodiments, the base 10 includes a slide support plate 101 and a bottom support plate 103 for supporting the slide support plate 101, and the first slide rail 114 is disposed on a surface of the slide support plate 101. Two through holes are arranged in parallel on the surface of the slide rail supporting plate 101, so that a bridge arm structure 104 is formed between the two through holes. The lower electrode 132 is disposed on the bridge arm structure 104.

In some embodiments, the upper electrode 131 and the lower electrode 132 are driven by the lifting mechanism 15 to achieve up-and-down lifting movement. The elevating mechanism 15 includes a first elevating mechanism 151 and a second elevating mechanism 152. Wherein the upper electrode 131 is connected to the second connection member 102 through the first elevating mechanism 151. The lower electrode 132 is connected to the base 10 through a second elevating mechanism 152.

In some embodiments, the first elevating mechanism 151 includes a first elevating cylinder connected to the second connection member 102 through the cylinder support plate 16, and the upper electrode 131 is connected to a cylinder rod of the first elevating cylinder. The second lifting mechanism 152 includes a second lifting cylinder, the second lifting cylinder is connected to the bridge arm structure 104 of the slide rail support plate 101, and the lower electrode 132 is connected to a cylinder rod of the second lifting cylinder.

In some embodiments, a pressure sensing unit is further provided between the upper electrode 131 and the first elevating mechanism 151 or between the lower electrode 132 and the second elevating mechanism 152. For example, the pressure sensing unit 17 is provided between the rear surface of the opposite test end of the lower electrode 132 and the cylinder rod of the second lift cylinder. The pressure sensing unit 17 is used to sense the pressure generated when the upper electrode 131 and the lower electrode 132 are moved toward each other to be in contact with the upper and lower surfaces of the bipolar plate sample 200, so that the bipolar plate sample 200 is tested under a prescribed pressure.

In some embodiments, the upper electrode 131 and the lower electrode 132 comprise gold-plated copper electrodes.

Referring to fig. 4 and to fig. 1-3. In some embodiments, the apparatus further comprises a pressure display unit 19 and a resistance detection unit 18. Wherein the pressure sensing unit 17 is signally connected to the pressure display unit 19. The resistance detection unit 18 is signal-connected to the upper electrode 131 and the lower electrode 132.

In some embodiments, the apparatus further comprises a test bench 100. In performing the test, the base 10 (including the translation guide 11, the sample holder 12, and the electrodes 13 provided on the base 10), the pressure display unit 19, and the resistance detection unit 18 are provided on the top of the test bench 100. After the test is finished, the base 10 (including the translation guide mechanism 11, the sample fixing member 12 and the electrode 13 provided on the base 10), the pressure display unit 19 and the resistance detection unit 18 may be stored in a cabinet provided on the test bench 100.

In some embodiments, the pressure sensing unit 17 comprises a pressure sensor. The pressure display unit 19 includes a pressure display. The resistance detection unit 18 comprises a digital micro-ohmmeter.

In some embodiments, the pressure display and digital microohm-meter are disposed on the stand 20 and can be stored with the stand 20 in the cabinet of the test bench 100.

In some embodiments, the bottom of the cabinet of the test bench 100 is provided with universal rollers 21 and adjustable height support feet 22.

Reference is made to fig. 1-4. In some embodiments, the device further comprises a handle 14. Wherein the handle 14 is separately provided on the sample holder 12 and the first sub-connector 111 of the first connector. When the test position needs to be adjusted or the test position needs to be switched between different test points on the bipolar plate sample 200, the handle 14 can be used for respectively exerting force on the sample fixing piece 12 and the first connecting piece, so that the sample fixing piece 12 and the first connecting piece can correspondingly move, and the sample fixing piece 12 can be translated to the required test position along the first direction and/or the second direction.

In some embodiments, the first sub-coupling 111 (first coupling) has a relief groove 116 formed in a surface thereof to relief the lower electrode 132. The relief groove 116 is, for example, a rectangular relief groove 116.

In operation of the device of the present utility model, the test site of the bipolar plate sample 200 placed and held on the sample holder 12 is first positioned (by movement manipulation of the handle 14). Then, two pieces of carbon paper are respectively placed between the test end of the upper electrode 131 and the upper surface of the bipolar plate sample 200, and between the test end of the lower electrode 132 and the lower surface of the bipolar plate sample 200, so as to realize the sequential electrical connection sequence of the upper electrode 131, the carbon paper, the bipolar plate sample 200, and the carbon paper, the lower electrode 132. Next, the upper and lower cylinders (first and second lift cylinders) are activated, the upper electrode 131 and the lower electrode 132 are relatively moved to contact the upper and lower surfaces of the bipolar plate sample 200, and the pressure is continued to be applied. At this time, the pressure sensor receives pressure to feed back the pressure value on the pressure display in real time. When the test pressure value is reached, the upper cylinder and the lower cylinder are controlled to stop working. At this time, the contact resistance value obtained by the test was displayed by a digital microohm meter. And then, controlling the upper cylinder and the lower cylinder to restore to the original positions, and ending the test. When it is necessary to switch the other test positions of the test sample 200, the sample 200 is moved left and right by moving the handle 14 on the sample holder 12 left and right (second direction), and likewise, the sample 200 is moved back and forth by moving the handle 14 on the first sub-connector 111 back and forth (first direction), so that the next test point of the sample 200 is located at the middle position of the electrode 13. And then repeating the testing steps to finish the test.

In summary, the sample fixing piece 12 is arranged between the upper electrode 131 and the lower electrode 132 and used for placing the test sample 200, so that the levelness of the sample 200 can be ensured, the level difference between the sample 200 and the electrode 13 is optimized, the fixing state of the sample 200 is more stable, the problem of large testing difficulty and easy bending deformation caused by oversized sample 200 can be solved by fixing the edge of the sample 200, the test requirement of samples 200 with different sizes can be met, the test accuracy and the result consistency can reach higher level, and in addition, the sample fixing piece 12 is designed to be moved, the rapid conversion between different test points of the sample 200 can be met by moving the sample fixing piece 12, the test operation is facilitated, and the test efficiency is obviously improved.

While embodiments of the present utility model have been described in detail hereinabove, it will be apparent to those skilled in the art that various modifications and variations can be made to these embodiments. It is to be understood that such modifications and variations are within the scope and spirit of the present utility model as set forth in the following claims. Moreover, the utility model described herein is capable of other embodiments and of being practiced or of being carried out in various ways.

Claims (10)

1. A contact resistance testing device, comprising: Base; A sample fixing part, movably disposed on the base, the sample fixing part is used to horizontally place the test sample and fix the edge of the sample; The electrodes are arranged on the base, and include an upper electrode and a lower electrode. The upper electrode and the lower electrode are arranged on the upper and lower sides of the sample fixing part respectively, and are used to be driven to move toward each other to contact the upper and lower surfaces of the sample for testing. 2 . The contact resistance testing device according to claim 1 , wherein the sample fixing member comprises a frame-shaped clamping portion, and the clamping portion is used to clamp at least two opposite sides of the sample to fix the samples of different sizes. 3. The contact resistance testing device according to claim 2 is characterized in that the clamping portion comprises a matching frame-shaped upper clamping portion and a frame-shaped lower clamping portion, which are used to clamp and fix at least two opposite sides of the sample from upper and lower sides respectively. 4 . The contact resistance testing device according to claim 3 , wherein the upper clamping portion and the lower clamping portion are rectangular frames and are movably connected to each other through a corresponding side of each rectangular frame. 5. The contact resistance testing device according to claim 1 is characterized in that a translation guide mechanism is provided on the base, the sample fixture is provided on the translation guide mechanism, and the translation guide mechanism is used to make the sample fixture translate along a first direction or along a second direction orthogonal to the first direction when the sample fixture is driven. 6. The contact resistance testing device according to claim 5 is characterized in that the translation guide mechanism includes a first translation guide sub-mechanism and a second translation guide sub-mechanism, the first translation guide sub-mechanism includes a matching first slide rail and a first slider, the second translation guide sub-mechanism includes a matching second slide rail and a second slider, the first slide rail is arranged on the base along the first direction, the first slider is provided with a first connecting member, the second slide rail is arranged on the first connecting member along the second direction, the sample fixing member is horizontally connected to the second slider, and the surface of the first connecting member is provided with an avoidance groove for avoiding the lower electrode. 7. The contact resistance testing device according to claim 1 is characterized in that the lower electrode is arranged on the surface of the base, a second connecting member is provided on the base, the upper electrode is arranged on the second connecting member, the upper electrode is connected to the second connecting member through a first lifting mechanism, the lower electrode is connected to the base through a second lifting mechanism, and a pressure sensing unit is also provided between the upper electrode and the first lifting mechanism or between the lower electrode and the second lifting mechanism. 8. The contact resistance testing device according to claim 7 is characterized in that it also includes: a pressure display unit and a resistance detection unit, the pressure sensing unit signal is connected to the pressure display unit, and the resistance detection unit signal is connected to the upper electrode and the lower electrode. 9 . The contact resistance testing device according to claim 6 , further comprising: a handle, wherein the handle is separately arranged on the sample fixing member and the first connecting member. 10 . The contact resistance testing device according to claim 8 , further comprising: a test bench, wherein the base, the pressure display unit and the resistance detection unit are arranged on the test bench.