Large-current test probe

Abstract

The utility model discloses a large-current test probe, which comprises a tube body, one end of the tube body is provided with a first probe body, the first probe body is fixedly connected with the tube body, the other end of the tube body far away from the first probe body is provided with a second probe body, the second probe body is partially wrapped by the tube body, and the tube body is provided with a first electrode. A guide column is arranged at the end, close to the first needle body, of the second needle body in the direction of the tube body, a spring is arranged between the first needle body and the second needle body, and the spring is tightened on the guide column and does not make contact with the inner wall of the tube body. The first needle body is fixedly connected with the tube body, so that the first needle body and the tube body can integrally move under the condition that the spring is compressed, the contact resistance between the first needle body and the tube body is stable, meanwhile, as the spring is tightly bound on the guide column and is not in contact with the inner wall of the tube body, redundant contact resistance cannot be generated, and the service life of the needle body is prolonged. Therefore, the energy loss and the heating phenomenon of the probe during the large-current test are reduced.

Description

Technical Field

[0001] The utility model relates to the field of test probes, in particular to a high-current test probe. Background Art

[0002] Existing test probes usually connect a spring at one end of the needle, and then the tube body is sleeved on the outside of the needle and spring. During testing, the needle will retract after contacting the test product, so the relative position between the needle and the tube body will change, and therefore the contact resistance between the two will change. At the same time, since the spring and the inner wall of the tube body are in contact with each other in the above scheme, the contact resistance between the spring and the tube body will also change during the continuous expansion and contraction of the spring. The frequent changes in contact resistance will first cause a large voltage drop on the contact resistance when a large current passes through, according to Ohm's law, resulting in energy loss and possible heating of the probe. Secondly, this unstable contact will lead to instability in current transmission, causing the current passing through the probe to fluctuate, affecting the normal operation of the equipment. Utility Model Content

[0003] In order to solve the above-mentioned problems, the utility model provides a high-current test probe, including a tube body, a first needle body is provided at one end of the tube body, the first needle body is fixedly connected to the tube body, and a second needle body is provided at the other end of the tube body away from the first needle body, the second needle body is partially wrapped by the tube body, and the second needle body can move inside the tube body along the inner wall of the tube body, and a guide column is provided at the end of the second needle body close to the first needle body along the direction of the tube body, and a spring is provided between the first needle body and the second needle body, and the spring is tightly bound to the guide column and does not contact the inner wall of the tube body.

[0004] Furthermore, the first needle body includes a contact portion, and an annular first supporting groove is provided at one end away from the contact portion, and the first supporting groove is used to abut against the tube body.

[0005] Furthermore, a positioning groove is provided on the first needle body, and a positioning hole corresponding to the position of the positioning groove is provided on the tube body.

[0006] Furthermore, a tubular accommodating cavity is provided in the first needle body, and the guide post of the second needle body extends deep into the accommodating cavity.

[0007] Furthermore, a second supporting groove and a third supporting groove are respectively provided on the first needle body and the second needle body, and the spring is clamped by the second supporting groove and the third supporting groove along the direction of the tube body.

[0008] Furthermore, an annular limiting groove is provided on a side of the second needle body away from the guide post, and a constricting portion cooperating with the limiting groove is provided on the tube body.

[0009] Furthermore, a plurality of tapered portions are provided on the contact portion.

[0010] Compared with the prior art, the beneficial effects of the present invention are:

[0011] In the present application, since the first needle body is fixedly connected to the tube body, when the spring is compressed, the first needle body and the tube body will move as a whole, so the contact resistance between the two is stable. At the same time, since the spring is tightly bound to the guide column and does not contact the inner wall of the tube body, no unnecessary contact resistance is generated, thereby reducing the energy loss and heat generation of the probe when performing high current testing.

[0012] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0014] Figure 1 This is an exploded view of the overall structure of the utility model;

[0015] Figure 2 This is a schematic structural diagram of the first needle body of the present invention;

[0016] Figure 3 This is a schematic structural diagram of the tube body of the present utility model;

[0017] Figure 4 This is a schematic structural diagram of the second needle body of the present invention;

[0018] Figure 5 This is a cross-sectional view of the overall structure of the utility model;

[0019] The reference numerals and names in the figures are as follows:

[0020] Tube body 100, first needle body 200, second needle body 300, guide column 310, spring 400, contact portion 210, first support groove 220, positioning groove 230, positioning hole 110, accommodating cavity 240, second support groove 250, third support groove 320, limiting groove 330, convergence portion 120, tapered portion 211. DETAILED DESCRIPTION

[0021] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0022] The present invention will be described in more detail. It should be understood that the specific embodiments described herein are intended only to explain the present invention and are not intended to limit the present invention. It should be noted that when an element is described as being "fixed to" another element, it may be directly on the other element, or one or more intervening elements may be present therebetween. When an element is described as being "connected to" another element, it may be directly connected to the other element, or one or more intervening elements may be present therebetween.

[0023] In the description of the present invention, it should be noted that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, vertical, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise stated, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself. In the description of the present invention, it should be noted that the use of words such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above words have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention. In the description of the embodiments of the present application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0024] Unless otherwise defined, all technical and scientific terms used in this specification have the same meanings as those commonly understood by those skilled in the art in the art of the present invention. The terms used in this specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0025] In addition, the technical features involved in different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0026] The preferred embodiment of the present invention will be further described with reference to the accompanying drawings. Figure 1 and Figure 5As shown, a high-current test probe includes a tube body 100, and a first needle body 200 is provided at one end of the tube body 100. The first needle body 200 is fixedly connected to the tube body 100, and the first needle body 200 is used to contact the product to be tested, such as a new energy battery, etc. A second needle body 300 is provided at the other end of the tube body 100 away from the first needle body 200, and the second needle body 300 is partially wrapped by the tube body 100, that is, part of the outer wall of the second needle body 300 is in contact with the inner wall of the tube body 100, and the second needle body 300 can move inside the tube body 100 along the inner wall of the tube body 100, and a guide column 310 is provided at the end of the second needle body 300 close to the first needle body 200 along the direction of the tube body 100, and a spring 400 is provided between the first needle body 200 and the second needle body 300, and the spring 400 is tightly bound to the guide column 310 and does not contact the inner wall of the tube body 100.

[0027] When testing is required, the first needle body 200 contacts the product under test, and the second needle body 300 is connected to the test fixture. When the first needle body 200 contacts the product under test, since the first needle body 200 is fixedly connected to the tube body 100, when the spring 400 is compressed, the first needle body 200 and the tube body 100 will move as a whole, so the contact resistance between the two is stable. At the same time, since the spring 400 is tightly bound to the guide column 310 and does not contact the inner wall of the tube body 100, no unnecessary contact resistance is generated, thereby reducing energy loss and heat generation of the probe when performing high current testing.

[0028] On the basis of the above embodiment, Figure 2 and Figure 5 As shown, the first needle body 200 includes a contact portion 210, which is used to contact the product to be tested. A first annular support groove 220 is provided at the end away from the contact portion 210. When the first needle body 200 and the tube body 100 are installed together, the tube wall of the tube body 100 abuts against the first support groove 220. In this way, when the contact portion 210 contacts the product to be tested, the first support groove 220 can drive the tube body 100 to move synchronously.

[0029] On the basis of the above embodiment, Figure 2 and Figure 5As shown, a positioning groove 230 is provided on the first needle body 200, and a positioning hole 110 corresponding to the position of the positioning groove 230 is provided on the tube body 100. When the first needle body 200 and the tube body 100 are installed together, a screw (not shown in the figure) can be inserted into the positioning groove 230 through the positioning hole 110, so that the first needle body 200 and the tube body 100 can be further fixed together, thereby further ensuring their synchronous movement.

[0030] On the basis of the above embodiment, Figure 2 and Figure 5 As shown, a tubular accommodating cavity 240 is provided in the first needle body 200, and the guide column 310 of the second needle body 300 is deep into the accommodating cavity 240. In this way, as the first needle body 200 and the tube body 100 move as a whole, the guide column 310 can continue to penetrate into the accommodating cavity 240, thereby guiding the movement of the first needle body 200 and the tube body 100, thereby avoiding the spring 400 tightly bound on the guide column 310 from contacting the inner wall of the tube body 100.

[0031] On the basis of the above embodiment, Figures 2 to 5 As shown, a second supporting groove 250 and a third supporting groove 320 are respectively provided on the first needle body 200 and the second needle body 300. The spring 400 is clamped by the second supporting groove 250 and the third supporting groove 320 along the direction of the tube body 100, so that when the spring 400 is compressed, the spring 400 can be prevented from being dislocated.

[0032] On the basis of the above embodiment, Figure 3 、 Figure 4 and Figure 5 As shown, an annular limiting groove 330 is provided on the side of the second needle body 300 away from the guide column 310, and a gathering portion 120 that cooperates with the limiting groove 330 is provided on the tube body 100. When the spring 400 is compressed to cause the second needle body 300 to move in the opposite direction, the limiting groove 330 can abut against the gathering portion 120, so that the second needle body 300 can be pushed out of the tube body 100 by the spring 400.

[0033] In some embodiments, such as Figure 2 As shown, the contact portion 210 is provided with a plurality of tapered portions 211 , and the tapered portions 211 can allow the contact portion 210 to contact the contact points of the product under test more accurately.

[0034] The above exemplary embodiments are detailed, and the present invention may be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the foregoing description, and it is intended that all changes that come within the meaning and range of equivalents of the claims be included within the present invention.

Claims

1. A high current test probe, characterized in that: The invention comprises a tube body (100), wherein a first needle body (200) is provided at one end of the tube body (100), and the first needle body (200) is fixedly connected to the tube body (100); a second needle body (300) is provided at the other end of the tube body (100) away from the first needle body (200); the second needle body (300) is partially wrapped by the tube body (100); the second needle body (300) can move inside the tube body (100) along the inner wall of the tube body (100); a guide column (310) is provided at one end of the second needle body (300) close to the first needle body (200) along the direction of the tube body (100); a spring (400) is provided between the first needle body (200) and the second needle body (300); the spring (400) is tightly bound to the guide column (310) and does not contact the inner wall of the tube body (100).

2. The high current test probe according to claim 1, characterized in that: The first needle body (200) comprises a contact portion (210), and an annular first supporting groove (220) is provided at one end away from the contact portion (210), wherein the first supporting groove (220) is used for abutting against the tube body (100).

3. The high current test probe according to claim 2, characterized in that: A positioning groove (230) is provided on the first needle body (200), and a positioning hole (110) corresponding to the position of the positioning groove (230) is provided on the tube body (100).

4. The high current test probe according to claim 1, characterized in that: A tubular accommodating cavity (240) is provided in the first needle body (200), and the guide post (310) of the second needle body (300) is inserted deep into the accommodating cavity (240).

5. The high current test probe according to claim 1, characterized in that: A second supporting groove (250) and a third supporting groove (320) are respectively provided on the first needle body (200) and the second needle body (300), and the spring (400) is clamped by the second supporting groove (250) and the third supporting groove (320) along the direction of the tube body (100).

6. The high current test probe according to claim 4, characterized in that: An annular limiting groove (330) is provided on the side of the second needle body (300) away from the guide column (310), and a constricting portion (120) cooperating with the limiting groove (330) is provided on the tube body (100).

7. The high current test probe according to any one of claims 2 or 3, characterized in that: A plurality of tapered portions (211) are provided on the contact portion (210).

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