OCV machine standard resistance disc calibration tool

Abstract

An OCV machine standard resistance disc calibration tool comprises a circuit board and a conductive structure arranged on the circuit board, the conductive structure forms positive and negative tabs used for simulating a battery, and the circuit board is provided with a standard resistor electrically connected with the conductive structure; the circuit board is also provided with a structural member used for simulating a battery structure. Compared with the prior art, the circuit board is provided with the conductive structure to simulate the positive and negative tabs of the battery, the conductive structure is connected to the OCV test equipment, the circuit board is provided with the standard resistor electrically connected with the conductive structure, and the detection result of the OCV test equipment is compared with the numerical value of the standard resistor. When deviation occurs, OCV machine compensation is carried out on the difference, calibration of the OCV machine is achieved, calibration of a single channel of the OCV machine can be achieved through a single calibration tool, the one-time calibration function of all channels can be achieved through a plurality of calibration tools, the accuracy of the OCV machine for measuring the resistance of the electric core is improved, the problem that the internal resistance of the electric core is large in difference is greatly solved, and the calibration accuracy of the OCV machine is improved. And the internal resistance consistency of the cell is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field, concretely relates to a kind of OCV machine standard resistance disk calibration tool. BACKGROUND

[0002] OCV machine, namely OCV test sorting machine, plays a vital role in electronic manufacturing and new energy field. OCV machine is mainly used for the accurate measurement of open circuit voltage (OCV) of battery or electronic component, and is automatically sorted according to the preset standard range. It can obtain voltage data of a large number of battery units or electronic components in real time and quickly, and effectively identify good and bad products through deep analysis of data, so as to improve overall product quality and reduce production cost.

[0003] In the prior art, in order to ensure the accuracy of lithium ion battery resistance measurement on OCV machine, the average value obtained by repeatedly measuring the battery core is used as the reference value to calibrate and compensate the OCV machine. Due to the different positions and distances between the root and top of the battery core tab, the measured resistance difference is about 0.1 mΩ. Using the battery core to calibrate the OCV machine will cause errors due to position.

[0004] To solve the above problems, the Chinese patent with application number 201822140077.5 discloses an OCV automatic calibration device. The calibration device disclosed above includes a rack and an electric control module. The rack is provided with a probe testing mechanism electrically connected with the electric control module. The probe testing mechanism is provided below a detection workbench. The detection workbench is provided with a measurement station and a calibration station. The measurement station is used for placing a battery to be measured, and the calibration station is used for placing a standard block. The probe testing mechanism can move between the measurement station and the calibration station, and measure the resistance value of the battery to be measured and the standard block. The electric control module can automatically calibrate the battery to be measured according to the measurement result of the probe testing mechanism on the standard block. The Chinese patent with application number 202410374527.4 discloses a calibration device and method for internal resistance of multi-channel OCV test equipment. The calibration device disclosed above includes a host computer, a battery tester, an electric control box and a plurality of calibration modules. The plurality of calibration modules are connected to the host computer and the battery tester through the electric control box. The host computer and the battery tester are communicatively connected. The plurality of calibration modules each use a 4-wire standard resistance with a resistance value of 1 mR as a reference source.

[0005] The prior art disclosed above firstly tests the battery cell inside the OCV machine, judges the measuring position according to the trace pressed on the surface of the pole lug of the battery cell after the OCV machine test. Then the actual measurement is carried out by using the advanced voltage resistance tester to test a basket of battery cells (45pcs), the average value of each battery cell is calculated after multiple measurements, and is used as a reference. The compensation value inside the OCV machine is cleared, and then the second measurement is carried out, the difference between the measured value and the voltage resistance tester is compensated by the OCV machine; however, the resistance measurement has difference due to the different pole lug positions, and the use of the battery cell to calibrate the OCV machine has the difference in the measuring position, and further causes the difference in the measurement result. Content of the utility model

[0006] The utility model discloses to overcome the defects in the prior art, provide a kind of OCV machine standard resistance disk calibration tool, which can realize that the resistance of different positions is consistent, and the calibration result is accurate and reliable.

[0007] In order to realize the above-mentioned utility model purposes, the utility model adopts the following technical solutions: a kind of OCV machine standard resistance disk calibration tool, including circuit board and the conductive structure being set on circuit board, the conductive structure forms the positive and negative lug for simulating battery, and standard resistance is electrically connected with the conductive structure on the circuit board;The circuit board is also provided with structural member for simulating battery structure.

[0008] As a preferred scheme of the utility model, the end of the circuit board is provided with a connecting part connected with the OCV machine, and the connecting part is located on the opposite sides of the circuit board.

[0009] As a preferred scheme of the utility model, the conductive structure is arranged on the connecting part, and the conductive structure is electrically connected with the circuit board.

[0010] As a preferred scheme of the utility model, the conductive structure is a copper sheet fixedly arranged on the connecting part.

[0011] As a preferred scheme of the utility model, the structural member is arranged on the opposite sides of the circuit board, and a gap for simulating the thickness of the battery is formed between the structural member and the circuit board.

[0012] As a preferred scheme of the utility model, the structural member is an insulating member.

[0013] As a preferred scheme of the utility model, the corner of the structural member is connected with a connecting member for fixedly connecting the circuit board.

[0014] As a preferred scheme of the utility model, a plurality of arrayed hollow grooves are arranged on the structural member.

[0015] Compared with the prior art, the utility model has the beneficial effects that:

[0016] 1. By setting conductive structures on the circuit board to simulate the positive and negative electrodes of a battery, the conductive structures are connected to the OCV testing equipment. At the same time, the circuit board is equipped with a standard resistor electrically connected to the conductive structures. The detection results of the OCV testing equipment are compared with the value of the standard resistor. When a deviation occurs, the OCV machine compensates for the difference, thus realizing the calibration of the OCV machine. A single calibration fixture can calibrate a single channel of the OCV machine. Using multiple calibration fixtures, all channels can be calibrated at once. This improves the accuracy of the OCV machine in measuring the cell resistance, significantly reduces the problem of large differences in cell internal resistance, and improves the consistency of cell internal resistance.

[0017] 2. Furthermore, by setting up structural components, the thickness and shape of the battery can be simulated. At the same time, by changing the size of the structural components, the calibration function of the OCV machine for different specifications of battery cells can be met, which improves the applicability of the calibration fixture and thus enhances its practicality and convenience. Attached Figure Description

[0018] Fig. 1 This is a schematic diagram of the structure of this utility model;

[0019] Fig. 2 This is a structural schematic diagram of the structural component of this utility model;

[0020] Fig. 3 This is the front view of the utility model.

[0021] Reference numerals: Circuit board 1, Connector 101, Structural component 2, Hollowed-out groove 201, Connector 202, Gap 203, Conductive structure 3, Copper sheet 301, Standard resistor 4. Detailed Implementation

[0022] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0023] like Figs. 1-3 As shown, an OCV machine standard resistor disk calibration fixture includes a circuit board 1 and a conductive structure 3 disposed on the circuit board 1. The conductive structure 3 forms positive and negative tabs for simulating a battery. The circuit board 1 is provided with a standard resistor 4 electrically connected to the conductive structure 3. The circuit board 1 is also provided with a structural component 2 for simulating a battery structure.

[0024] Further, the resistance value of the standard resistor 4 is 1 mΩ, and the standard resistor 4 is electrically connected to the circuit board 1, the conductive structure 3 is electrically connected to the standard resistor 4, the conductive structure 3 forms the positive and negative tabs of the simulated battery, the conductive structure 3 is connected to the OCV machine for testing, and the test results of the test equipment of the OCV machine are compared with the value of the standard resistor 4. When there is a deviation, the difference is compensated by the OCV machine to realize the calibration of the OCV machine. At the same time, a single calibration tool can realize the calibration of a single channel of the OCV machine, and multiple calibration tools can realize one-time calibration of all channels, improve the accuracy of the OCV machine in measuring the resistance of the battery, greatly reduce the problem of large difference in the resistance of the battery, and improve the consistency of the resistance of the battery.

[0025] The end of the circuit board 1 is provided with a connecting part 101 connected to the OCV machine, and the connecting part 101 is located on the opposite sides of the circuit board 1. Further, the connecting part 101 is an extension structure arranged along the length direction of the circuit board 1, and the connecting part 101 and the circuit board 1 are an integral structure. At the same time, the connecting part 101 is provided with two, and is located on the opposite sides of the same end of the circuit board 1. The two connecting parts 101 form the positive and negative tab structure of the simulated battery, and are connected to the OCV machine for testing.

[0026] The conductive structure 3 is arranged on the connecting part 101, and the conductive structure 3 is electrically connected to the circuit board 1. Further, the conductive structure 3 is arranged on the front and back surfaces of the connecting part 101. Specifically, the conductive structure 3 is a copper sheet 301 fixedly arranged on the connecting part 101, and the copper sheet 301 is electrically connected to the connecting part 101. Since the connecting part 101 and the circuit board 1 are an integral structure, the copper sheet 301 is electrically connected to the circuit board 1, and the standard resistor 4 is electrically connected to the circuit board 1, so that the copper sheet 301 is electrically connected to the standard resistor 4.

[0027] The structure 2 is arranged on the opposite sides of the circuit board 1, and a gap 203 for simulating the thickness of the battery is formed between the structure 2 and the circuit board 1. Further, the structure 2 is a plate-shaped structure arranged on the two sides of the circuit board 1. The structure 2 realizes the simulation of the thickness and shape of the battery, and by changing the size of the structure 2, the OCV machine calibration function of different specifications of the battery is realized, the application range of the calibration tool is improved, and the practicality and convenience of the calibration tool are improved.

[0028] In addition, the structure 2 is an insulating member, specifically, the structure 2 can be an epoxy plate. The epoxy plate is light in weight and low in price, so that the epoxy plate as the structure 2 reduces the weight of the calibration tool, and also reduces the cost of the calibration tool. In addition, other material plates can also be used as the structure 2.

[0029] The corner of the structural part 2 is connected with a connecting piece 202 for fixing the connecting circuit board 1, further, the connecting piece 202 is connected on the circuit board 1, the fixing of the structural part 2 is realized through the connecting piece 202, meanwhile, the gap 203 between the structural part 2 and the circuit board 1 is formed through the connecting piece 202, further, the thickness of the battery can be simulated, in the embodiment, the connecting piece 202 adopts rivet, and bolt, stud and the like can also be used.

[0030] The structural part 2 is provided with a plurality of array distributed hollow grooves 201, further, the plurality of hollow grooves 201 are uniformly arranged on the structural part 2, the weight reduction of the structural part 2 is realized through the plurality of hollow grooves 201.

[0031] The above description of disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application; therefore, the present application will not be limited to these embodiments shown herein, but will accord with the widest scope consistent with the principles and novel features disclosed herein.

[0032] Although the terms such as circuit board 1, connecting part 101, structural part 2, hollow groove 201, connecting piece 202, gap 203, conductive structure 3, copper sheet 301, standard resistor 4 and the like are used more in the drawings, the possibility of using other terms is not excluded. The use of these terms is only for more convenient description and explanation of the essence of the present application; any kind of additional limitation is contrary to the spirit of the present application.

Claims

1. An OCV machine standard resistance track calibration fixture, characterized by, The application relates to a circuit board (1) and a conductive structure (3) arranged on the circuit board (1), the conductive structure (3) forms positive and negative tabs for simulating a battery, the circuit board (1) is provided with a standard resistor (4) electrically connected with the conductive structure (3); and the circuit board (1) is further provided with a structural part (2) for simulating a battery structure.

2. The OCV machine standard resistance track calibration fixture of claim 1, wherein, The end of the circuit board (1) is provided with a connecting part (101) connected with an OCV machine, and the connecting part (101) is located on the opposite sides of the circuit board (1).

3. The OCV machine standard resistance track calibration fixture of claim 2, wherein, The conductive structure (3) is arranged on the connecting part (101), and the conductive structure (3) is electrically connected with the circuit board (1).

4. The OCV machine standard resistance track calibration fixture of claim 2, wherein, The conductive structure (3) is a copper sheet (301) fixedly arranged on the connecting part (101).

5. The OCV machine standard resistance track calibration fixture of claim 1, wherein, The structural part (2) is arranged on the opposite sides of the circuit board (1), and a gap (203) for simulating the thickness of a battery is formed between the structural part (2) and the circuit board (1).

6. The OCV machine standard resistance track calibration fixture of claim 1, wherein, The structural part (2) is an insulating part.

7. The OCV machine standard resistance track calibration fixture of claim 1, wherein, The corner of the structural part (2) is connected with a connecting part (202) for fixing the circuit board (1).

8. The OCV machine standard resistance track calibration fixture of claim 1, wherein, The structural part (2) is provided with a plurality of arrayed hollow grooves (201).

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