Rapid positioning structure for contact resistance measurement

Abstract

The utility model relates to a rapid positioning structure for contact resistance measurement. The rapid positioning structure comprises a bottom plate, a positioning rod, a compression spring, a lower carbon paper positioning block, an upper carbon paper positioning block, a polar plate positioning block, a top plate, a lower pressure head and an upper pressure head. After the device is used, the lower carbon paper and the upper carbon paper are quickly positioned and conveniently placed; quickly positioning the polar plate, contacting with the lower carbon paper after positioning, and fixing the position of the lower carbon paper; parts are uniform in position, and batch testing is facilitated.

Description

Technical Field

[0001] The utility model belongs to the technical field of fuel cells and specifically discloses a rapid positioning structure for measuring the contact resistance of a hydrogen fuel cell plate. Background Art

[0002] In metal hydrogen fuel cells, the resistance between the electrode plate and the carbon paper accounts for about 60% of the total resistance of the entire battery stack, which is an important factor in ohmic polarization. In order to reduce the contact resistance, a special material coating needs to be added to the surface of the metal electrode plate. One of the evaluations of the coating quality is to measure the contact resistance between the electrode plate and the carbon paper.

[0003] The existing contact resistance measurement method is to manually align and place the carbon paper and the electrode plate, which has the following problems: 1. The carbon paper is small and light, difficult to align, and will change its position when subjected to a slight force; 2. After the electrode plate is placed, the lower carbon paper is blocked and it is impossible to determine whether it has shifted; 3. The warping of the electrode plate may cause the upper carbon paper to be unable to be placed in the correct position; 4. The operation time is long, the position of the parts cannot be unified, and it is not convenient for batch operation. Summary of the invention

[0004] The purpose of the utility model is to overcome the deficiencies in the prior art and provide a rapid positioning structure for contact resistance measurement that can effectively and accurately control the positions of the electrode plates and carbon paper, thereby ensuring the accuracy of the measurement position and ultimately improving the efficiency and accuracy of the contact resistance measurement.

[0005] According to the technical solution provided by the utility model, the rapid positioning structure for contact resistance measurement includes a bottom plate, a positioning rod, a compression spring, a lower carbon paper positioning block, an upper carbon paper positioning block, a plate positioning block, a top plate, a lower pressure head and an upper pressure head;

[0006] The lower carbon paper positioning block and the upper carbon paper positioning block are both annular structures;

[0007] A lower pressure head is fixed on the upper surface of the bottom plate, and a plurality of positioning rods are fixed on the upper surface of the bottom plate corresponding to the outer side of the lower pressure head. The positioning rods surround the lower pressure head, and the axis of the positioning rods is perpendicular to the upper surface of the bottom plate. A compression spring is sleeved on the outside of each positioning rod, and the lower end of the compression spring contacts the upper surface of the bottom plate; lower carbon paper positioning block positioning holes equal to the number of positioning rods are opened on the lower carbon paper positioning block and around its center hole, the lower carbon paper positioning block is sleeved on the positioning rods through the lower carbon paper positioning block positioning holes, the lower surface of the lower carbon paper positioning block contacts the upper end of the compression spring, a lower carbon paper positioning block positioning groove is opened on the lower carbon paper positioning block and around its center hole, at least two plate positioning blocks are installed on the upper surface of the bottom plate outside the lower carbon paper positioning block, the plate positioning blocks surround the lower carbon paper positioning block, and a plate positioning step is opened on each plate positioning block;

[0008] A top plate is fixed above the bottom plate, an upper pressure head mounting hole is opened on the top plate, an upper pressure head is slidably mounted in the upper pressure head mounting hole, a movement direction of the upper pressure head is perpendicular to the upper surface of the bottom plate, and the position of the upper pressure head corresponds to that of the lower pressure head;

[0009] An upper carbon paper positioning block is provided between the lower carbon paper positioning block and the upper pressure head. The center hole of the upper carbon paper positioning block has the same shape as the positioning groove of the lower carbon paper positioning block, and the center hole of the upper carbon paper positioning block is located directly above the positioning groove of the lower carbon paper positioning block.

[0010] Preferably, an upper carbon paper positioning block positioning groove is provided on the upper surface of the upper carbon paper positioning block; at least two laser lamps are fixed on the lower surface of the top plate, and the light beams of the laser lamps are directed vertically downward. The light beams of the laser lamps shine into the upper carbon paper positioning block positioning groove to locate the position of the upper carbon paper positioning block.

[0011] The utility model has the following advantages:

[0012] 1. The lower carbon paper and the upper carbon paper can be quickly positioned and placed conveniently;

[0013] 2. The plate is quickly positioned and contacts the lower carbon paper after positioning to fix the position of the lower carbon paper;

[0014] 3. The parts are positioned uniformly to facilitate batch testing. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the utility model. DETAILED DESCRIPTION

[0016] In order to make the purpose, technical solution and advantages of the embodiments of the utility model clearer, the technical solution of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0017] A fast positioning structure for contact resistance measurement, such as Figure 1 As shown, it includes a bottom plate 1, a positioning rod 2, a compression spring 3, a lower carbon paper positioning block 4, an upper carbon paper positioning block 5, a plate positioning block 6, a top plate 7, a lower pressure head 9 and an upper pressure head 10;

[0018] The lower carbon paper positioning block 4 and the upper carbon paper positioning block 5 are both annular structures;

[0019] A lower pressure head 9 is fixed on the upper surface of the bottom plate 1, and a plurality of positioning rods 2 are fixed on the upper surface of the bottom plate 1 corresponding to the outer side of the lower pressure head 9. The positioning rods 2 surround the lower pressure head 9, and the axis of the positioning rods 2 is perpendicular to the upper surface of the bottom plate 1. A compression spring 3 is sleeved on the outside of each positioning rod 2, and the lower end of the compression spring 3 contacts the upper surface of the bottom plate 1; lower carbon paper positioning block positioning holes 4.1 equal to the number of positioning rods 2 are opened on the lower carbon paper positioning block 4 and around its center hole. The lower carbon paper positioning block 4 is sleeved on the positioning rod 2 through the lower carbon paper positioning block positioning hole 4.1, the lower surface of the lower carbon paper positioning block 4 is in contact with the upper end of the compression spring 3, a lower carbon paper positioning block positioning groove 4.2 is provided on the lower carbon paper positioning block 4 and around the center hole thereof, at least two plate positioning blocks 6 are installed on the upper surface of the bottom plate 1 outside the lower carbon paper positioning block 4, the plate positioning blocks 6 surround the lower carbon paper positioning block 4, and each plate positioning block 6 is provided with a plate positioning step 6.1;

[0020] A top plate 7 is fixed above the bottom plate 1, an upper pressure head mounting hole 7.1 is opened on the top plate 7, an upper pressure head 10 is slidably mounted in the upper pressure head mounting hole 7.1, and the movement direction of the upper pressure head 10 is perpendicular to the upper surface of the bottom plate 1, and the position of the upper pressure head 10 corresponds to that of the lower pressure head 9;

[0021] An upper carbon paper positioning block 5 is provided between the lower carbon paper positioning block 4 and the upper pressure head 10. The center hole of the upper carbon paper positioning block 5 has the same shape as the positioning groove 4.2 of the lower carbon paper positioning block, and the center hole of the upper carbon paper positioning block 5 is located directly above the positioning groove 4.2 of the lower carbon paper positioning block.

[0022] An upper carbon paper positioning block positioning groove 5.1 is opened on the upper surface of the upper carbon paper positioning block 5; at least two laser lamps 8 are fixed on the lower surface of the top plate 7, and the light beams of the laser lamps 8 are directed vertically downward. The light beams of the laser lamps 8 shine into the upper carbon paper positioning block positioning groove 5.1 to locate the position of the upper carbon paper positioning block 5.

[0023] In the embodiment of the utility model, it is preferable that there are four positioning rods 2, and the positioning rods 2 are fixed on the bottom plate 1 through through holes or countersunk holes and are evenly distributed. There are four compression springs 3, which are respectively sleeved on each positioning rod 2, and the lower end of the compression spring 3 contacts the upper surface of the bottom plate 1. The lower carbon paper positioning block 4 is sleeved on the four positioning rods 2 through the lower carbon paper positioning block positioning hole 4.1, and the lower surface of the lower carbon paper positioning block 4 contacts the upper end of the compression spring 3. An upper carbon paper positioning block positioning groove 5.1 is provided on the upper surface of the upper carbon paper positioning block 5, corresponding to the light beam of the laser lamp 8. The plate positioning block 6 is fixed on the upper surface of the bottom plate 1. The top plate 7 is fixed above the bottom plate 1. Two laser lamps 8 are fixed on the lower surface of the top plate 7, and the light beams are vertically downward, corresponding to the upper carbon paper positioning block positioning groove 5.1 on the upper carbon paper positioning block 5.

[0024] The working principle of the embodiment of the utility model is as follows:

[0025] The lower pressure head 9 is fixed, and the lower carbon paper 12 is placed in the lower carbon paper positioning block positioning groove 4.2 of the lower carbon paper positioning block 4. At this time, the lower carbon paper positioning block 4 is supported by the compression spring 3, and the lower carbon paper 12 does not contact the lower pressure head 9. The electrode plate 11 is placed in the electrode plate positioning step 6.1 of the positioning block 6, and the lower surface of the electrode plate 11 contacts the upper surface of the lower carbon paper positioning block 4. Due to the effect of gravity, the electrode plate 11 compresses the compression spring 3. At this time, the lower carbon paper positioning block 4 moves downward, the electrode plate 11 contacts the lower carbon paper 12, and the lower surface of the lower carbon paper 12 contacts the upper surface of the lower pressure head 9, and the lower carbon paper 12 is fixed. The positioning block 5 is placed on the upper surface of the electrode plate 11. The upper carbon paper positioning block 5 can move on the upper surface of the electrode plate 11. An upper carbon paper positioning block positioning groove 5.1 is opened on the upper surface of the upper carbon paper positioning block 5. Two laser lamps 8 are fixed on the lower surface of the top plate 7. The light beams of the laser lamps 8 are directed vertically downward. The light beams of the laser lamps 8 are shone into the upper carbon paper positioning block positioning groove 5.1 to locate the position of the upper carbon paper positioning block 5. An upper carbon paper 13 having exactly the same shape as the lower carbon paper 12 is placed in the center hole of the upper carbon paper positioning block 5. The upper pressure head 10 is moved downward, and the upper carbon paper 13 is pressed directly above the lower carbon paper 12 to measure the contact resistance.

[0026] Finally, it should be noted that the above specific implementation methods are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to examples, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A fast positioning structure for contact resistance measurement, characterized by: It comprises a bottom plate (1), a positioning rod (2), a compression spring (3), a lower carbon paper positioning block (4), an upper carbon paper positioning block (5), a plate positioning block (6), a top plate (7), a lower pressing head (9) and an upper pressing head (10); The lower carbon paper positioning block (4) and the upper carbon paper positioning block (5) are both annular structures; A lower pressure head (9) is fixed on the upper surface of the bottom plate (1); a plurality of positioning rods (2) are fixed on the upper surface of the bottom plate (1) corresponding to the outer side of the lower pressure head (9); the positioning rods (2) surround the lower pressure head (9); the axes of the positioning rods (2) are perpendicular to the upper surface of the bottom plate (1); a compression spring (3) is sleeved on the outside of each positioning rod (2); the lower end of the compression spring (3) is in contact with the upper surface of the bottom plate (1); and a number of lower carbon paper positioning block positioning holes (4.1) equal to the number of positioning rods (2) are provided on the lower carbon paper positioning block (4) and around the center hole thereof. ), the lower carbon paper positioning block (4) is sleeved on the positioning rod (2) through the lower carbon paper positioning block positioning hole (4.1), the lower surface of the lower carbon paper positioning block (4) is in contact with the upper end of the compression spring (3), a lower carbon paper positioning block positioning groove (4.2) is provided on the lower carbon paper positioning block (4) and around the center hole thereof, at least two plate positioning blocks (6) are installed on the upper surface of the bottom plate (1) outside the lower carbon paper positioning block (4), the plate positioning blocks (6) surround the lower carbon paper positioning block (4), and each plate positioning block (6) is provided with a plate positioning step (6.1); A top plate (7) is fixed above the bottom plate (1), an upper pressure head mounting hole (7.1) is provided on the top plate (7), an upper pressure head (10) is slidably mounted in the upper pressure head mounting hole (7.1), the movement direction of the upper pressure head (10) is perpendicular to the upper surface of the bottom plate (1), and the position of the upper pressure head (10) corresponds to that of the lower pressure head (9); An upper carbon paper positioning block (5) is provided between the lower carbon paper positioning block (4) and the upper pressure head (10); a center hole of the upper carbon paper positioning block (5) has the same shape as a positioning groove (4.2) of the lower carbon paper positioning block, and the center hole of the upper carbon paper positioning block (5) is located directly above the positioning groove (4.2) of the lower carbon paper positioning block.

2. The rapid positioning structure for contact resistance measurement according to claim 1, characterized in that: An upper carbon paper positioning block positioning groove (5.1) is provided on the upper surface of the upper carbon paper positioning block (5); at least two laser lamps (8) are fixed on the lower surface of the top plate (7), and the light beams of the laser lamps (8) are directed vertically downward. The light beams of the laser lamps (8) shine into the upper carbon paper positioning block positioning groove (5.1) to locate the position of the upper carbon paper positioning block (5).

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