CN209946328U

CN209946328U - Four-wire symmetrical detection method test clamp

Info

Publication number: CN209946328U
Application number: CN201920244317.8U
Authority: CN
Inventors: 马连生
Original assignee: Research Institute Of Measurement And Control Technology Of Qingda Navigation (beijing)
Current assignee: Research Institute Of Measurement And Control Technology Of Qingda Navigation (beijing)
Priority date: 2019-02-27
Filing date: 2019-02-27
Publication date: 2020-01-14
Anticipated expiration: 2029-02-27

Abstract

The utility model relates to a four-wire symmetry detection method test clip, including the test clip body, the center of the test clip body is provided with a through hole in a penetrating way, the test clip body is provided with a first electrode terminal and a second electrode terminal which are symmetrically arranged, the test clip body is made of metal or metal oxide material, the surface of the test clip body is provided with a tin coating, the utility model is suitable for being fixed on a battery pole for a long time; the voltage is collected to ensure that the data is timely and accurate; the installation, the plug at any time, the future maintenance or the replacement of the acquisition line are convenient; the battery pack is arranged on the battery pole column at one time without being disassembled and assembled again due to upgrading of the acquisition line; the battery pole is suitable for various battery poles which are fixedly connected with the wire by using bolts; the stability and the accuracy of measuring the internal resistance are high, two lines of the excitation current are absolutely separated and symmetrically arranged, the currents are not interfered with each other, and the excitation current is ensured to effectively pass through.

Description

Four-wire symmetrical detection method test clamp

Technical Field

The utility model relates to a battery energy storage and performance state data measurement technical field especially relate to a four-wire symmetrical detection method test clip.

Background

Valve-regulated lead acid batteries (VRLA) have been rapidly deployed in many different areas over the last two decades. The lead-acid battery has promise of 'maintenance-free', so that the lead-acid battery is popularized in new fields and plays a significant role in replacing the traditional acid-proof explosion-proof battery.

In the power supply system, the most critical is the storage battery. The importance of routine monitoring and maintenance of the health of the storage battery is highlighted. The following situations can occur in the practical use process of the battery:

1. most "maintenance-free" batteries have a much shorter service life than expected.

2. The battery may not be managed by a specific person or by regulations after installation.

3. The manual inspection and prejudgment are difficult, the voltage can be measured only by touching, seeing and measuring the voltage, and the professional knowledge of data analysis is insufficient.

4. Many occasions do not have the conditions for periodic discharge inspection and maintenance.

5. The battery is not charged and discharged according to the specified flow and time.

6. The maintenance costs of routine inspection of unattended sites are high.

7. Most battery monitoring systems only collect the voltage of the battery and do not reflect problems.

8. A UPS with "battery management functions" does not detect a single battery.

9. When the battery pack is used, it is actually one battery failure = the failure of the whole battery pack.

10. The fire extinguishing agent can be used for smoking, explosion and fire without any indication.

If the real-time state and the future development trend of the battery are needed to be known, the internal change, the energy storage condition and the future risk of the battery can be judged only by carrying out systematic, timely and accurate measurement, and the data such as the voltage, the temperature, the internal resistance and the like of the battery are measured. The timely and accurate data plays a decisive role in judging the state of the battery.

Currently, there are three main known measurement techniques: (1) and a test clip; the test clamp can be used for roughly detecting a single battery conveniently and quickly, and is suitable for detecting batteries without disassembling; however, the traditional test clamp measures battery data, a copper clamp is required to be clamped on a battery post, because the battery post is various in types, the data accuracy is affected by the fact that the virtual and real contact points and the position of the copper clamp and the battery post are different, the internal resistance of the battery is collected, the problem of contact resistance increase can occur due to the fact that the copper clamp and the battery post are not in real contact, the measurement values are different due to the fact that the positions of the clamp clamps are different, the internal resistance of the battery cannot be determined to be data, the battery is used as a backup power supply and is generally connected in series by a plurality of batteries, multiple groups of batteries can be connected in parallel for increasing the load capacity, and the number of the batteries is large, so that the copper clamp is inconvenient to install. (2) Two-wire method test clip; the two-wire method is to connect the continuous measurement wire directly to the pole piece wire. During measurement, the resistance of the connecting wire is also calculated in the measured resistance value, the wire resistance, the contact internal resistance and the actual resistance value cannot be separated, the resistance change value of the sensor and the resistance value of the connecting wire jointly form the output value of the sensor, the actual measurement value is higher due to additional errors caused by the resistance of the connecting wire, the actual measurement value cannot be used in occasions with higher measurement precision requirements, and the length of the measuring wire cannot be overlong. (3) Four-wire asymmetric test clips; because the four-wire connecting terminals of the asymmetric test clamp are not symmetrically arranged, the excitation current sent by the excitation current wire cannot be completely received by the receiving end, two excitation currents interfere with each other, and the numerical coefficient received by the other two measuring wires is influenced, so that an accurate internal resistance value cannot be obtained, and the small internal resistance value of the battery is difficult to accurately measure.

SUMMERY OF THE UTILITY MODEL

The utility model discloses a solve above-mentioned technical problem, provide a measure the small internal resistance numerical value of battery, accurate high, low cost, simple installation, use convenient four-wire symmetrical detection method test clamp.

The utility model adopts the technical proposal that:

the utility model provides a four-wire symmetry detection method test clip, includes the test clip body, the test clip body center runs through and is provided with a through-hole, be equipped with first electrode terminal and the second electrode terminal that the symmetry set up on the test clip body, the test clip body is metal or metallic oxide material the test clip body surface is equipped with the tin coating.

Preferably, the diameter of the through hole is 2-16 mm.

Preferably, the thickness of the test clamp body for the four-line symmetric detection method is 0.2-0.8 mm.

Preferably, in the four-line symmetric detection method test clip, the metal is nickel, gold, silver or copper.

Preferably, in the test clip for four-line symmetry detection method, the width of the first electrode terminal is 0.2-0.63 cm.

Because the resistance value of the internal resistance of the battery is small, the detection of the internal resistance of the battery generally adopts a Kelvin Four-wire detection method, the Kelvin Four-wire detection (Kelvin Four-terminal sensing) is also called Four-terminal detection (4T detection, 4T sensing), Four-wire detection or a 4-point probe method, and the Kelvin Four-wire detection is an electrical impedance measurement technology, uses independent counter current and voltage detection electrodes, and can carry out more accurate measurement compared with the traditional two-terminal (2T) sensing. Kelvin four wire testing is used for some ohmmeters and impedance analyzers and in the wiring configuration of precision strain gauges and resistance thermometers. And can also be used to measure the sheet resistance of the film. The key advantage of four wire sensing is the separate current and voltage electrodes, eliminating the impedance of wiring and contact resistance.

The beneficial effects of the utility model reside in that:

(1) the battery pole is suitable for being fixed on a battery pole for a long time;

(2) the data can be ensured to be timely and accurate by collecting the voltage;

(3) the installation is convenient, the plugging and unplugging are carried out at any time, and the acquisition line is maintained or replaced in the future;

(4) the battery pack is arranged on the battery pole column at one time without being disassembled and assembled again due to upgrading of the acquisition line;

(5) the battery pole is suitable for various battery poles which are fixedly connected with the wire by using bolts;

(6) the stability and the accuracy of measuring the internal resistance are high, two lines of the excitation current are absolutely separated and symmetrically arranged, the currents are not interfered with each other, and the excitation current is ensured to effectively pass through;

(7) the contact area between the electrode post and the battery is increased, the contact firmness is improved, and the long-time measurement and monitoring of the battery are facilitated;

(8) the production cost is low.

(9) The device is suitable for various sinking type, column type and cylindrical battery pole columns and bolt apertures, and the pole pieces can be bent according to the layout or shape of the pole columns without influencing the precision;

(10) the plug spring terminal is suitable for connection of plug spring terminals of various specifications;

(11) the thickness and the material quality of the test clamp can be adjusted conveniently according to the current.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a first embodiment of the present invention;

fig. 2 is a schematic structural diagram of a second embodiment of the present invention;

fig. 3 is a schematic structural diagram of a third embodiment of the present invention.

The reference numerals are explained below:

1. a test clip body; 2. a through hole; 3. a first electrode terminal; 4. and a second electrode terminal.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be described in detail below. It is to be understood that the embodiments described are only some embodiments of the invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

The first embodiment,

Referring to fig. 1, this embodiment provides a four-wire symmetry detection method test clip, including the test clip body, the test clip body center is run through and is provided with a through-hole, be equipped with first electrode terminal and the second electrode terminal that the symmetry set up on the test clip body, the test clip body is metal or metallic oxide material the test clip body surface is equipped with the tin coating.

The diameter of the through hole is 4mm, the thickness of the test clamp body is 0.8mm, the width of the first electrode terminal is 0.63cm, and the width of the metal copper is 0.8 mm.

Example II,

Referring to fig. 2, in this embodiment, on the basis of the first embodiment, a connection terminal extends from a circular central portion of the test fixture body.

The test clamp of this embodiment still possesses the installation battery thermoscope function, inserts temperature measuring device on the test clamp terminal, can in time accurate measurement battery utmost point post temperature, acquires the inside temperature situation of battery. The temperature measurement is realized by adopting a single wire, a temperature measuring diode is arranged on the pole piece, the single wire is injected with temperature measuring current to flow into the pole piece, the temperature measurement is realized by utilizing the voltage drop of the diode, and the temperature measuring cost is reduced. In addition, the temperature measuring diode is arranged on the pole piece, the heat conduction of the electrode metal is far better than that of a plastic shell of the battery, and the temperature response characteristic is improved.

Example III,

In the embodiment, the middle part of the pole piece of the test clamp body is provided with the groove for being installed on batteries with different shapes.

The test clamping piece is mainly used for measuring data such as voltage, internal resistance and temperature of various batteries. And acquiring accurate data by a Kelvin four-line method.

The test clamping pole pieces are arranged on the positive pole column and the negative pole column of the battery. The pole piece is placed below a battery pole series connection wire copper nose (or a hard link copper plate), after the pole connection line is fastened through bolts, the pole piece is tightly combined with the battery pole, and a measuring line of a measuring device is connected to the test pole piece in an inserting mode, so that the measuring requirement is met, and the passing of normal charging and discharging current of the battery is not influenced.

And measuring data, namely sending pulse current to the test clamp electrode (turning to a battery pole) through a measuring device, enabling the current to reach the other end through one end of the battery pole, conducting the current to the potential end of the test clamp pole through the battery pole, and judging the internal resistance value of the battery through the acquired data after the control device receives the current data.

The symmetrical distribution of the positions of the potential end and the current end of the electrode plate of the test clamp ensures that the position of sending the exciting current and the position of the receiving end are always consistent every time, can effectively reduce the potential influence of the surface current of the test clamp on the offset of the potential end, and directly improves the measurement precision under the condition of low internal resistance.

Similarly, the test card of this embodiment has the same function as the temperature detector of the embodiment.

The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and all should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. The utility model provides a four-wire symmetry detects method test clip which characterized in that: including test clamp body (1), test clamp body (1) center is run through and is provided with a through-hole (2), be equipped with first electrode terminal (3) and second electrode terminal (4) that the symmetry set up on test clamp body (1), test clamp body (1) is the metal or metal oxide material test clamp body (1) surface is equipped with the tin coating.

2. The clamp for four-line symmetry assay according to claim 1, wherein the diameter of the through hole (2) is 2-16 mm.

3. The clamp for four-line symmetry testing according to claim 1, wherein the thickness of the clamp body (1) is 0.2-0.8 mm.

4. The four-wire symmetry assay test clip of claim 1, wherein said metal is nickel, gold, silver or copper.

5. The clamp for four-line symmetry assay according to claim 1, wherein the width of the first electrode terminal (3) is 0.2-0.63 cm.