CN218629622U

CN218629622U - Little resistance metering testing arrangement

Info

Publication number: CN218629622U
Application number: CN202222771301.7U
Authority: CN
Inventors: 刘科; 金骋; 武亚红; 李学法; 张国平
Original assignee: Yangzhou Nanopore Innovative Materials Technology Ltd
Current assignee: Yangzhou Nanopore Innovative Materials Technology Ltd
Priority date: 2022-10-20
Filing date: 2022-10-20
Publication date: 2023-03-14
Anticipated expiration: 2032-10-20

Abstract

The utility model relates to a little resistance metering ization testing arrangement, include: the clamping unit is used for clamping an object to be detected; a distance measuring unit for measuring a length of the portion to be measured; the clamping unit comprises a first probe part and a second probe part which are respectively contacted with two ends of an object to be measured, and the distance between the first probe part and the second probe part is measured through the distance measuring unit. This little resistance measurement ization testing arrangement uses with little resistance meter cooperation, can directly measure the length of the part that awaits measuring, calculates through the formula and reachs the unit resistance to can quantify the comparison to the resistance of the object that awaits measuring of difference, make can realize comparing the welding of the welding part of different width or different materials, application range is more extensive.

Description

Little resistance metering testing arrangement

Technical Field

The utility model belongs to the technical field of little resistance measurement, concretely relates to little resistance metering testing arrangement.

Background

Development and research of batteries have become an area of much attention. Batteries are widely used in the fields of consumer electronics and electric vehicles due to the advantages of high energy density, long service life, greenness, no pollution, high safety performance and the like, and meanwhile, the demands of people on batteries are increasingly strong. How to achieve high safety and high energy density of the battery has become a focus of current research. With the continuous development of the battery industry, the current collectors of the batteries are mainly pure aluminum foils and copper foils, and composite current collectors with better performance, that is, composite current collectors formed by compounding high polymers and metals.

For pure copper foil and aluminum foil, the main processing technology is to directly weld the current collector and the tab together by using ultrasonic wave or laser welding. For the above-mentioned composite current collector, the conventional technical scheme is to use laser or ultrasonic (tooth welding, rolling welding) to perform transfer welding, weld the foil and the composite current collector together, fuse the metal foil and the metal layer on the side of the composite current collector at high temperature in the welding process, and realize welding after cooling. And then the foil is welded with the electrode lug, so that the overcurrent capacity of the composite current collector is improved.

Whether the welding of traditional pure aluminium foil, copper foil, still compound mass flow body, all need detect its welding quality's quality, often judge the welding effect through the overcurrent resistance of test welding part. Since the aluminum foil and the copper foil have excellent conductivity, the resistance of the welded portion thereof ranges from 0.001m omega to 100m omega, which is a test of a minute resistance, and a micro resistance instrument is used.

The common micro-resistance meter currently used has the following defects: at present, probes are handheld, and the distance between the probes cannot be quantified. However, the resistance is proportional to the length, the probe distance cannot be determined, and the comparison between different welding conductors cannot be carried out.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a little resistance measurement ization testing arrangement to the weak point that above-mentioned prior art exists to solve the technical problem who provides in the background art.

In order to realize the above purpose, the utility model discloses a little resistance metering testing arrangement, include:

the clamping unit is used for clamping an object to be detected;

a distance measuring unit for measuring the length of the portion to be measured;

the clamping unit comprises a first probe part and a second probe part which are respectively contacted with two ends of an object to be measured, and the distance between the first probe part and the second probe part is measured through the distance measuring unit.

Preferably, the distance measuring unit includes a scale bar.

Preferably, the graduated scale has a graduation value of 1mm.

Preferably, the clamping unit is connected to the distance measuring unit, at least one of the first probe part and the second probe part is connected with the distance measuring unit in a sliding manner, and the probe part slidably mounted on the distance measuring unit can slide along the length direction of the distance measuring unit.

Preferably, the distance measuring unit further comprises a digital display meter, and the digital display meter is arranged on the probe part which is arranged on the distance measuring unit in the first probe part and the second probe part in a sliding manner.

Preferably, the clamping unit is provided as a clamp-type probe including an upper clamp, a lower clamp, and a torsion spring that generates a pressing force between the upper clamp and the lower clamp.

Preferably, the pressure generated between the upper and lower tongs is greater than or equal to 20N.

Preferably, a sawtooth is arranged at one end of the clamp type probe, which is contacted with the object to be detected.

Preferably, one end of the clamp type probe is provided with an anti-slip layer.

Preferably, the torsion spring is made of piano steel wires.

Compared with the prior art, the utility model discloses a little resistance metering testing arrangement has following beneficial effect:

the utility model provides a little resistance meter ization testing arrangement uses with little resistance meter cooperation, can directly measure the length of the part that awaits measuring, calculates through the formula and reachs the unit resistance to can quantify the comparison to the resistance of the object that awaits measuring of difference, make can realize carrying out the comparison to the welding of the welding part of different width or different materials, application range is more extensive.

Drawings

The present invention will be further explained with reference to the drawings and examples.

Fig. 1 is a schematic structural diagram of the micro-resistance metering and testing device of the present invention.

Fig. 2 is a schematic view of a part of the structure of a clamp-type probe in a micro-resistance metering and testing device of the present invention.

Fig. 3 is a schematic structural diagram of the micro-resistance metering testing device of the present invention during testing.

Fig. 4 is a graph of the relationship test of the pressure and the resistance of the present invention.

Description of reference numerals:

wherein:

1. a clamping unit; 11. a first probe portion; 12. a second probe portion; 111. an upper clamp; 112. a lower clamp; 113. a torsion spring; 114. an upper handle; 115. a lower handle; 116. a wire;

2. a distance measuring unit; 21. a graduated rod; 22. a digital display meter;

3. an object to be measured; 31. a portion to be measured.

Detailed Description

The following detailed description of the preferred embodiments of the present invention will be provided in conjunction with the accompanying drawings, so as to enable those skilled in the art to more easily understand the advantages and features of the present invention, and thereby define the scope of the invention more clearly and clearly.

The micro-resistor in the embodiment is a micro-resistor for testing milliohm and microohm levels, and the specific parameter can be 0.006 percent of precision; the resolution is 0.01 mu omega; measuring range: 0.01 mu omega-12000M omega. The little resistance metering testing arrangement of this embodiment is for cooperating little resistance instrument use, belongs to frock clamp, and the range of application is the test of lithium cell electricity core welding part overcurrent resistance, including the welding of traditional foil and utmost point ear, the welding of compound mass flow body and foil etc. also can be for the test of other small resistance, like small signal contact, small-size fuse, small motor coil, relay inspection etc..

As shown in the attached drawing, the micro-resistance metering testing device comprises a clamping unit 1 and a distance measuring unit 2. The holding unit 1 is for holding an object to be measured 3, and the distance measuring unit 2 is for measuring the length of the portion to be measured 31.

The holding unit 1 includes a first probe portion 11 and a second probe portion 12 that contact both ends of the object 3 to be measured, respectively, and the distance between the first probe portion 11 and the second probe portion 12 is measured by the distance measuring unit 2. The micro-resistance metering test device is based on resistance information and distance obtained by the first probe part 11 and the second probe part 12.

The distance measuring unit 2 comprises a scale rod 21, and the scale rod 21 can be set to have a total length less than or equal to 20cm. The surface of the graduated rod 21 is marked with scales, the graduation value of the graduated rod 21 is 1mm, and the precision is higher. The distance measuring unit 2 further comprises a digital display meter 22, and the digital display meter 22 is arranged on the probe part arranged on the distance measuring unit 2 in the first probe part 11 and the second probe part 12 in a sliding manner.

The clamping unit 1 is connected to the distance measuring unit 2, at least one of the first probe head part 11 and the second probe head part 12 is connected with the distance measuring unit 2 in a sliding manner, and the probe head part mounted in the distance measuring unit 2 in a sliding manner can slide along the length direction of the distance measuring unit 2. The first probe part 11 and the second probe part 12 are installed on the scale rod 21, and may be two probe parts both slidably connected with the clamping unit 1, or one of the two probe parts may be fixedly connected with the clamping unit 1. For example, the first probe unit 11 is fixed to one end of the scale bar 21, and the second probe unit 12 can move along the scale bar 21 by a distance mainly depending on the length of the test sample. During the movement, the digital display table 22 on the second probe part 12 can directly display the movement distance.

The probes of the first probe part 11 and the second probe part 12 are made of copper materials with high conductivity, so that the conductivity of the probes connected between the part to be tested and the micro resistance meter can be ensured, and the accuracy of the test is ensured.

The probes are detachably assembled on the first probe part 11 and the second probe part 12, and can be in a snap connection, a screw connection or a pin connection, which is not limited herein, and a user can replace the type of the probe and detach the probe for storage according to actual requirements.

The probe is configured as a clamp type probe, i.e. the first probe portion 11 and the second probe portion 12 are clamp type probes. The clamp-type probe includes an upper clamp 111, a lower clamp 112, a torsion spring 113, an upper handle 114, a lower handle 115, and a guide wire 116. The clamp-type probe is connected to a micro-resistance meter by a wire 116.

The end of the clamp-type probe contacting with the object 3 to be tested is provided with saw teeth, that is, the inner measurement of the end of the upper clamp 111 and the lower clamp 112 contacting with the object 3 to be tested is designed with saw teeth, so that when clamping the object to be tested, the friction force can be improved, and the application range of the test can be enlarged, for example, the clamping measurement of some round conductors.

The grip end of the clamp type probe is provided with an anti-slip layer, that is, the upper handle 114 and the lower handle 115 are provided with anti-slip layers at the holding positions for preventing slip, such as horizontal bars or convex points.

The torsion spring 113 in the clamp type probe is made of piano wire with large rigidity modulus, in this embodiment, the rigidity modulus is 21000, and the effective number of turns of the spring is ensured to be more than 3 turns, so that the pressure of the probe reaches more than 20N, and in other embodiments, the rigidity modulus can be more than 21000, such as 30000 and the like.

The clamp type probe generates a pressure between the upper clamp 111 and the lower clamp 112 by a torsion spring 113. The pressure generated between the upper and

lower clamps

111 and 112 should be greater than or equal to 20N. The pressure of the clamp-type probe on the sample has a great influence on the test result, and if the pressure is unstable or insufficient in the test process, contact resistance is generated, and the contact resistance is fatal to the test of the tiny resistance. FIG. 4 is a graph of pressure versus resistance measured in units of N and in units of Ω. As can be seen from fig. 4, when the pressure is small, the contact resistance reaches 900 Ω; when the pressure is increased to more than 20N, the resistance is minimum and tends to be stable, the slope change of the image is large, and an exponential relationship is presented. Therefore, in the embodiment, the material selection and the effective number of turns of the spring are larger than 3 turns, so that the pressure of the probe can reach more than 20N, and the influence of contact resistance is avoided.

In actual use, the two probes are clamped at positions as close as possible to the edge of the portion to be measured 31. Taking composite current collector-foil welding as an example: the total resistance includes the resistance of the foil, the welded portion and the current collector, so it is required that the probe is as close as possible to the edge of the object being measured.

The first probe part 11 or the second probe part 12 is provided with a hole for the scale rod 21 to pass through, or the scale rod 21 is provided with a groove, and the first probe part 11 or the second probe part 12 is provided with a slide block capable of sliding in the groove, so that the first probe part 11 or the second probe part 12 can slide relative to the scale rod 21.

The formula of the resistance is R = ρ × L/S, where ρ represents the resistivity of the resistance and is determined by its own properties, L represents the length of the resistance, and S represents the cross-sectional area of the resistance. In order to compare the resistance values of the different samples, the resistance measured by the device is converted into a unit resistance, and the unit resistance = the tested resistance/length distance and has a unit of m Ω/mm. The test resistance is a numerical value displayed by the micro resistance meter, and the length distance is a direct distance between the first probe part 11 and the second probe part 12, namely a numerical value displayed on the digital display meter 22.

Therefore, the second probe head part 12 moves on the scale rod 21, the distance between the two probe head parts is automatically measured, the concept of resistance per unit length is adopted, the test result of the micro-resistance meter can be calculated according to a formula, and the resistance = total resistance/welding width, so that the welding parts with different widths or the welding parts with different materials can be compared in size, and the quantitative comparison is carried out. In addition, in the above scheme, the clamp type probe provides pressure for the torsion spring 113 during testing, and the selection of the material and the effective number of turns of the torsion spring 113 in the clamp type probe enable the testing pressure to be greater than 20N, thereby greatly reducing the influence of contact resistance. This embodiment is selecting under the invariable temperature test environment, can fix key parameters such as distance, pressure, the temperature of test procedure, guarantees the accuracy of result.

The present invention has been described in terms of the above embodiments, but it is to be understood that the above embodiments are for purposes of illustration and description only and are not intended to limit the invention to the described embodiments. Various modifications and changes may occur to those skilled in the art, including combinations and subcombinations of the features. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A little resistance measurement testing arrangement which characterized in that: comprises that

The clamping unit is used for clamping an object to be detected;

2. The micro-resistance metrology testing device of claim 1, wherein: the distance measuring unit includes a scale bar.

3. The micro-resistance metrology testing device of claim 2, wherein: the division value of the graduated rod is 1mm.

4. The micro-resistance metering test device according to claim 1, wherein: the clamping unit is connected to the distance measuring unit, at least one probe part of the first probe part and the second probe part is connected with the distance measuring unit in a sliding mode, and the probe parts mounted in the distance measuring unit in a sliding mode can slide along the length direction of the distance measuring unit.

5. The micro-resistance metering test device according to claim 4, wherein: the distance measuring unit further comprises a digital display meter, and the digital display meter is arranged in the first probe part and the second probe part and is installed on the probe part on the distance measuring unit in a sliding mode.

6. The micro-resistance metering test device according to claim 1, wherein: the clamping unit is arranged to be a clamp type probe which comprises an upper clamp, a lower clamp and a torsion spring, and the torsion spring enables pressure to be generated between the upper clamp and the lower clamp.

7. The micro-resistance metering test device according to claim 6, wherein: the pressure generated between the upper clamp and the lower clamp is greater than or equal to 20N.

8. The micro-resistance metering test device according to claim 6, wherein: and sawteeth are arranged at one end of the clamp type probe, which is contacted with an object to be detected.

9. The micro-resistance metering test device according to claim 6, wherein: and an anti-slip layer is arranged at one end of the clamp type probe.

10. The micro-resistance metrology testing device of claim 6, wherein: the torsion spring is made of piano steel wires.