Calibration tool for button cell test cabinet

Abstract

The utility model discloses a button cell test cabinet calibration tool which is provided with a bakelite plate, and a negative electrode deformable copper sheet and a positive electrode deformable copper sheet are arranged on the bakelite plate. The negative electrode deformable copper sheet and the positive electrode deformable copper sheet are respectively connected with an equipment end negative terminal and an equipment end positive terminal on the charging and discharging equipment all-in-one machine through copper connecting wires; and the negative electrode deformable copper sheet and the positive electrode deformable copper sheet are respectively connected with a high-precision universal meter through test wires. By adopting the technical scheme, the accuracy of test data is ensured; the calibration process is simplified, the operation is convenient and rapid, and button cells of different specifications can be rapidly and accurately calibrated; the calibration efficiency is improved, and the calibration is more convenient and timely; the tool is low in manufacturing cost, diversified tests can be realized, and normal operation is not affected by synchronous use.

Description

Technical Field

[0001] This utility model belongs to the technical field of lithium-ion battery charging and discharging device testing, and particularly relates to button cell battery charging and discharging testing technology. More specifically, this utility model relates to a button cell battery test cabinet calibration fixture. Background Technology

[0002] The existing button cell test cabinets use two types of clamps: alligator clips and pin clamps (with positive and negative terminals at the top and bottom). Calibration is difficult, and calibration is usually performed on the power module leads. This calibration method can only ensure the accuracy of the power module and cannot identify situations where voltage and current inaccuracies are caused by faults in the test cabinet clamps.

[0003] Because the module is associated with multiple channels and there are many lines between the channels, there is a risk of channel connection errors; traditional methods are slow, error-prone, and relatively inefficient.

[0004] Considering that the output voltage of the test cabinet is generally 5V and the current is measured in mA, a high-precision multimeter can be used for direct calibration. However, the multimeter probes cannot be directly connected to the test cabinet, especially when using a pin-type clamp. Therefore, in existing button cell battery test cabinet calibration methods, it is usually necessary to remove the battery, which is not only time-consuming but also increases the complexity of the operation.

[0005] Using keywords such as "charge; discharge; test; calibration; tooling", a search was conducted on existing publicly available technical documents, yielding the following results:

[0006] 1. Chinese patent document: "An automatic calibration device and calibration method for a portable charging and discharging device", patent (application) number: 201910412272.5; the technical solution described therein is:

[0007] "The automatic calibration device for portable charging and discharging equipment includes a fixture, a relay execution module, a communication relay module, a host computer, and a high-precision multimeter; the communication relay module is connected to the relay execution module, the host computer, and the high-precision multimeter; the fixture is connected to the relay execution module, and the relay execution module is connected to the high-precision multimeter."

[0008] The technical effects described are:

[0009] "It is easy to operate, which reduces the professional requirements for calibration personnel; it can shorten calibration time, improve testing efficiency, reduce test error rate, and reduce testing costs."

[0010] 2. Chinese patent document: "Calibration device for charging and discharging equipment", patent (application) number: 202422175008.3; the technical solution described therein is:

[0011] "The calibration device for the charging and discharging equipment includes a control module and a calibration fixture. The control module is communicatively connected to the calibration fixture. The calibration fixture includes multiple test channels and a sampling module. Each test channel is connected to a corresponding charging and discharging channel of the charging and discharging equipment under test. The sampling module is used to sample the voltage or current of the test channel. The calibration fixture includes a calibration unit, which includes a preset number of test channels. The calibration unit has a first test channel and a second test channel. The first test channel is connected to the second test channel through a sampling line to form a sampling circuit. The charging and discharging channel connected to the first test channel is used to input the charging current of the sampling circuit or output the discharging current of the sampling circuit. The charging and discharging channel connected to the second test channel is used to output the discharging current of the sampling circuit or input the charging current of the sampling circuit."

[0012] The technical effects described are:

[0013] "Reducing the degree of human involvement in the calibration process of charging and discharging equipment enables automated calibration, lowering the calibration cost and effectively improving the automation level of the calibration device, thereby increasing calibration efficiency. It also reduces the calibration error rate and improves calibration accuracy. The calibration process of the calibration fixture is simpler. No additional constant voltage source is needed to charge and discharge the calibration fixture; the calibration current and discharge current are calibrated using only the calibration fixture itself, saving equipment resources. Multiple calibration units within the calibration fixture can be calibrated in parallel, and the current calibration of the first and second test channels can be completed simultaneously, greatly improving calibration efficiency."

[0014] However, the technical solutions described in the aforementioned technical documents, as well as the existing publicly available technical solutions, have not been able to solve the problems and defects in the existing technology, such as "inaccurate voltage and current testing" and "complex operation". Utility Model Content

[0015] This utility model provides a calibration fixture for a button battery test cabinet, the purpose of which is to improve the accuracy and convenience of testing.

[0016] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0017] This utility model discloses a button cell test cabinet calibration fixture, including a high-precision multimeter for testing an integrated charge-discharge device. The calibration fixture is equipped with a bakelite board, on which are mounted a negative deformable copper sheet and a positive deformable copper sheet. The negative and positive deformable copper sheets are connected to the negative and positive terminals of the integrated charge-discharge device via copper connecting wires, respectively. The negative and positive deformable copper sheets are also connected to the high-precision multimeter via test leads.

[0018] The test leads are connected to the positive voltage and resistance input terminals and the negative voltage and resistance input terminals on a high-precision multimeter, respectively.

[0019] The dimensions of the deformable copper sheet for the negative electrode and the deformable copper sheet for the positive electrode are 20×20×2mm.

[0020] The thickness of the bakelite board is 3mm.

[0021] The copper connecting wire connected to the positive terminal of the device has a red insulating outer layer; the copper connecting wire connected to the negative terminal of the device has a black insulating outer layer.

[0022] The test lead connected to the positive voltage resistor input terminal has a red insulating outer layer; the test lead connected to the negative voltage resistor input terminal has a black insulating outer layer.

[0023] The negative voltage resistor input terminal is the common input terminal of a high-precision multimeter.

[0024] The high-precision multimeter mentioned is model DT9205A.

[0025] The calibration fixture is equipped with button battery test cabinet calibration software.

[0026] This utility model adopts the above-mentioned technical solution, which ensures the accuracy of test data; simplifies the calibration process, makes operation convenient and quick, and can quickly and accurately calibrate button batteries of different specifications; improves calibration efficiency and makes calibration more convenient and timely; the tooling manufacturing cost is low, it can realize diversified testing, and simultaneous use does not affect normal operation. Attached Figure Description

[0027] The following is a brief explanation of the contents shown in the attached figure and the markings therein:

[0028] Figure 1 This is a schematic diagram of the structure of this utility model.

[0029] The diagram is marked as follows:

[0030] 1. High-precision multimeter (DT9205A), 2. Positive voltage and resistance input terminal, 3. Negative voltage and resistance input terminal (COM terminal, i.e., common input terminal), 4. Bakelite board, 5. Negative deformable copper sheet, 6. Positive deformable copper sheet, 7. Negative terminal of the device, 8. Positive terminal of the device, 9. Integrated charging and discharging device, 10. LCD button, 11. High-definition LCD display, 12. Power switch, 13. Data hold switch, 14. Function knob, 15. Transistor input socket, 16. Current and capacitor terminal, 17. 20A terminal, 18. Protective sleeve. Detailed Implementation

[0031] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings, so as to help those skilled in the art to have a more complete, accurate and in-depth understanding of the inventive concept and technical solution of the present invention.

[0032] like Figure 1 The structure shown in this utility model is a button battery test cabinet calibration fixture, including a high-precision multimeter 1, used to test the integrated charging and discharging equipment 9.

[0033] In order to solve the problems and overcome the defects of the existing technology, and to achieve the invention objective of improving testing accuracy and convenience, the technical solution adopted by this utility model is as follows:

[0034] like Figure 1 As shown, the button battery test cabinet calibration fixture of this utility model is equipped with a bakelite board 4, on which a deformable negative electrode copper sheet 5 and a deformable positive electrode copper sheet 6 are arranged. The deformable negative electrode copper sheet 5 and the deformable positive electrode copper sheet 6 are respectively connected to the negative terminal 7 and the positive terminal 8 of the integrated charging and discharging equipment 9 through copper connecting wires. The deformable negative electrode copper sheet 5 and the deformable positive electrode copper sheet 6 are also respectively connected to a high-precision multimeter 1 through test leads.

[0035] The high-precision multimeter 1 is model DT9205A. The high-precision multimeter 1 is equipped with an LCD jack 10, a high-definition LCD display 11, a power switch 12, a data hold switch 13, a function knob 14, a transistor input socket 15, a current / capacitor terminal 16, and a 20A terminal 17.

[0036] The high-precision multimeter 1 uses a protective sleeve 18 to protect the outer casing.

[0037] The button battery test cabinet calibration fixture of this utility model has the following characteristics:

[0038] 1. It can realize the effect of the total resistance of the module and fixture on the voltage signal;

[0039] 2. The tooling allows for quick installation, increasing calibration speed (by approximately 50%);

[0040] 3. The tooling has a large contact area, which effectively reduces contact impedance and ensures the accuracy and reliability of calibration;

[0041] 4. The tooling has a wider range of applications, and can be used for both pin-type and alligator clip types.

[0042] The beneficial effects achieved by this utility model are:

[0043] 1. Deformable copper sheets (5 for negative electrode and 6 for positive electrode) have wide applicability and strong calibration compatibility;

[0044] 2. Easy and quick to operate;

[0045] 3. Because the module is associated with multiple channels and there are many lines between channels, there is a risk of channel connection errors. Traditional methods are slow, error-prone, and relatively inefficient. Using the tooling of this utility model to directly connect to the channel for calibration can avoid this.

[0046] 4. The improved copper tooling has a larger cross-sectional area, which can effectively reduce the contact resistance and effectively identify the effects of aging caused by long-term use of equipment fixtures and circuits.

[0047] 5. The tooling has low production cost, can be diversified, and can be used simultaneously without affecting normal operation.

[0048] Specific production methods and operating steps:

[0049] 1. The dimensions of the deformable copper sheet 5 (negative electrode) and 6 (positive electrode) are 20×20×2mm. 20×20×2 (mm) soft copper sheets are used as the positive and negative electrodes.

[0050] 2. The thickness of the bakelite board 4 is 3mm. The positive and negative electrode sheets (the deformable copper sheet 5 for the negative electrode and the deformable copper sheet 6 for the positive electrode) are respectively installed on both sides of the 3mm thick bakelite board 4 (the bakelite board 4 serves as insulation) and fixed.

[0051] 3. The copper connecting wire connected to the positive terminal 8 of the device has a red insulating outer layer; the copper connecting wire connected to the negative terminal 7 of the device has a black insulating outer layer. Copper connecting wires are used on the metal sheets (negative deformable copper sheet 5 and positive deformable copper sheet 6) to connect to the positive and negative terminals (negative terminal 7 and positive terminal 8 of the charging and discharging equipment 9). The positive wire is red and the negative wire is black for distinction.

[0052] 4. The test leads are connected to the positive voltage / resistance input terminal 2 and the negative voltage / resistance input terminal 3 of the high-precision multimeter 1, respectively. The test lead connected to the positive voltage / resistance input terminal 2 has a red insulating outer layer; the test lead connected to the negative voltage / resistance input terminal 3 has a black insulating outer layer. The negative voltage / resistance input terminal 3 is the common input terminal of the high-precision multimeter 1. The positive and negative connecting wires are then connected to the high-precision multimeter 1, with the COM terminal (negative voltage / resistance input terminal 3, i.e., the common input terminal) being black and the other end (positive voltage / resistance input terminal 2) being red for distinction.

[0053] 5. Place the calibration fixture into the fixture in the test cabinet, ensuring that the positive and negative terminals correspond to each other;

[0054] 6. Select the DC voltage or DC current range of the high-precision multimeter 1 according to the actual calibration requirements;

[0055] 7. The calibration fixture is equipped with calibration software for the button cell battery test cabinet. Open the calibration software for the test cabinet, click "calibrate," and a high-precision multimeter can be used to obtain the actual voltage or current output by the test cabinet.

[0056] 8. At this point, the voltage or current displayed on the test cabinet software can be compared. If it is inaccurate, the voltage or current value can be read from a high-precision multimeter in the calibration software to complete the calibration.

[0057] This invention not only improves the calibration efficiency of button cell battery charging and discharging devices but also significantly enhances the accuracy and reliability of the calibration process. In practical applications, operators can quickly and accurately calibrate button cells of different specifications without changing the fixture. The tooling design allows calibration to be performed without removing the battery, thereby improving operational convenience and safety.

[0058] The fixture of this invention can be directly placed into the test cabinet fixture and can be connected to multiple channels. It can then be connected to a high-precision multimeter 1, allowing for direct reading during calibration. This improves calibration efficiency and makes calibration more convenient and timely. The multi-channel connection function of the fixture makes it possible to calibrate multiple battery channels simultaneously, which is particularly important for improving work efficiency in large-scale production environments. The selection of materials and surface treatment processes for the fixture have also been carefully designed to ensure stability and durability under long-term use and reduce calibration errors caused by wear.

[0059] Furthermore, the tooling design of this invention takes into account the size differences of different button cell battery models, and ensures compatibility with various battery models through an adjustable clamp structure. The tooling structure design also considers anti-static and electromagnetic interference characteristics, ensuring accurate calibration results can be obtained in various electromagnetic environments.

[0060] In summary, the tooling of this utility model not only simplifies the calibration process, but also brings innovation and improvement to the calibration of button battery charging and discharging devices.

[0061] The following is a comparison between this utility model and the prior art:

[0062] I. Comparative examples of existing technologies, calibration using traditional methods:

[0063] 1. Remove the test cells from the calibration module and prepare for calibration;

[0064] 2. Connect the appropriate terminals to the output terminals in the module;

[0065] 3. After powering on, perform current and voltage calibration sequentially according to the module startup procedure;

[0066] 4. Through the metering calibration option in the system management menu, enter the password to perform voltage and current calibration.

[0067] II. An embodiment of this utility model, with its improved calibration method:

[0068] 1. Remove the test cells from the calibration channel and prepare for calibration;

[0069] 2. Connect the calibration fixture directly to the fixture for testing the single-channel battery of the module;

[0070] 3. After powering on, perform current and voltage calibration sequentially for each channel using a fixed startup procedure;

[0071] 4. Through the metering calibration option in the system management menu, enter the password to perform voltage and current calibration.

[0072] Test results and efficiency comparison:

[0073] External calibration institution voltage calibration:

[0074] Equipment Channel Set value (V) Display value (V) Error (V) Maximum permissible error (V) in conclusion CH1-1 1.50000 1.4999 -0.0001 ±0.0025 qualified CH1-1 2.00000 1.9999 -0.0001 ±0.0025 qualified CH1-1 2.50000 2.4998 -0.0002 ±0.0025 qualified CH1-1 3.75000 3.7498 -0.0002 ±0.0025 qualified CH1-1 4.35000 4.3498 -0.0002 ±0.0025 qualified CH1-1 5.00000 4.9998 -0.0002 ±0.0025 qualified

[0075] External calibration of current:

[0076]

[0077]

[0078] Calibration fixture voltage calibration:

[0079] Equipment Channel Set value (V) Display value (V) Error (V) Maximum permissible error (V) in conclusion CH1-1 1.50000 1.4998 -0.0002 ±0.0025 qualified CH1-1 2.00000 1.9998 -0.0002 ±0.0025 qualified CH1-1 2.50000 2.4998 -0.0002 ±0.0025 qualified CH1-1 3.75000 3.7498 -0.0002 ±0.0025 qualified CH1-1 4.35000 4.3498 -0.0002 ±0.0025 qualified CH1-1 5.00000 4.9998 -0.0002 ±0.0025 qualified CH1-2 1.50000 1.4999 -0.0001 ±0.0025 qualified CH1-2 2.00000 1.9998 -0.0002 ±0.0025 qualified CH1-2 2.50000 2.4998 -0.0002 ±0.0025 qualified CH1-2 3.75000 3.7498 -0.0002 ±0.0025 qualified CH1-2 4.35000 4.3498 -0.0002 ±0.0025 qualified CH1-2 5.00000 4.9998 -0.0002 ±0.0025 qualified

[0080] Calibration fixture current calibration:

[0081] Equipment Channel Set value (mA) Display value (mA) Error (mA) Maximum permissible error (mA) in conclusion CH1-1 2.000 2.0012 0.0012 ±0.0050 qualified CH1-1 5.000 5.0015 0.0015 ±0.0050 qualified CH1-1 7.000 7.0018 0.0018 ±0.0050 qualified CH1-1 10.000 10.0011 0.0011 ±0.0050 qualified CH1-2 2.000 2.0008 0.0008 ±0.0050 qualified CH1-2 5.000 5.0009 0.0009 ±0.0050 qualified CH1-2 7.000 7.0005 0.0005 ±0.0050 qualified CH1-2 10.000 10.0014 0.0014 ±0.0050 qualified

[0082] The present invention has been described above with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the inventive concept and technical solution of the present invention, or the direct application of the inventive concept and technical solution to other situations without modification, are all within the protection scope of the present invention.

Claims

1. A button cell battery test cabinet calibration fixture, comprising a high-precision multimeter (1) for testing an integrated charging and discharging device (9); characterized in that: The calibration fixture is equipped with a bakelite board (4), on which a negative deformable copper sheet (5) and a positive deformable copper sheet (6) are provided. The negative deformable copper sheet (5) and the positive deformable copper sheet (6) are respectively connected to the negative terminal (7) and the positive terminal (8) of the integrated charging and discharging equipment (9) through copper connecting wires. The negative deformable copper sheet (5) and the positive deformable copper sheet (6) are also respectively connected to a high-precision multimeter (1) through test leads.

2. The button cell test cabinet calibration fixture according to claim 1, characterized in that: The test leads are connected to the positive voltage resistance input terminal (2) and the negative voltage resistance input terminal (3) of the high-precision multimeter (1), respectively.

3. The button cell test cabinet calibration fixture according to claim 1, characterized in that: The dimensions of the deformable copper sheet (5) for the negative electrode and the deformable copper sheet (6) for the positive electrode are 20×20×2 (mm).

4. The button cell test cabinet calibration fixture according to claim 1, characterized in that: The thickness of the bakelite board (4) is 3 mm.

5. The button cell test cabinet calibration fixture according to claim 1, characterized in that: The copper connecting wire connected to the positive terminal (8) of the device end has a red insulating outer layer; the copper connecting wire connected to the negative terminal (7) of the device end has a black insulating outer layer.

6. The button cell test cabinet calibration fixture according to claim 2, characterized in that: The test lead connected to the positive voltage resistor input terminal (2) has a red insulating outer layer; the test lead connected to the negative voltage resistor input terminal (3) has a black insulating outer layer.

7. The button cell test cabinet calibration fixture according to claim 2, characterized in that: The negative voltage resistor input terminal (3) is the common input terminal of the high-precision multimeter (1).

8. The button cell test cabinet calibration fixture according to claim 1, characterized in that: The high-precision multimeter (1) is model DT9205A.

9. The button cell test cabinet calibration fixture according to claim 1, characterized in that: The calibration fixture is equipped with button battery test cabinet calibration software.

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