Calibration method and calibration system for battery charging and discharging test device

Abstract

A calibration method and calibration system for a battery charging and discharging test device. The calibration method comprises: providing a standard power source, which is used for simulating a load of a battery charging and discharging test device, and a control terminal (S101), wherein the control terminal is in communication connection with the standard power source and the test device by means of a communication network; the control terminal reading a standard electrical parameter output by the standard power source and a test electrical parameter output by the test device, and comparing the standard electrical parameter with the test electrical parameter, so as to obtain a calibration coefficient (S102); and transmitting the calibration coefficient to the test device, such that the test device performs calibration on the basis of the calibration coefficient (S103). On the basis of the calibration method, automatic calibration of the battery charging and discharging test device is realized, and the calibration efficiency of the test device is effectively improved, thereby saving on the operation costs and improving the production capacity of a battery.

Description

Calibration method and calibration system for battery charge and discharge test equipment

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent application number 202311573612.5, filed with the Chinese Patent Office on November 23, 2023, and entitled “Calibration Method and Calibration System for Battery Charging and Discharging Test Equipment,” the entire contents of which are incorporated by reference into this application. Technical Field

[0003] The present disclosure relates to the technical field of calibration of battery charge and discharge test equipment, and in particular to a calibration method and a calibration system for battery charge and discharge test equipment. Background Art

[0004] With the development of the new energy and energy storage industries, the demand for lithium batteries in real-world production and life has increased significantly due to their high energy density, long lifespan, and environmental friendliness. Before shipping, batteries often need to be tested to see if they meet shipping standards. This is done by charging and discharging the batteries using battery charge and discharge testing equipment and analyzing the test data generated during the process to determine if the batteries meet shipping standards.

[0005] In this regard, the accuracy of battery charging and discharging test equipment directly affects the standards of batteries leaving the factory.

[0006] Therefore, in order to ensure the accuracy of the test data of the battery charge and discharge test equipment and make the voltage accuracy and current accuracy of the battery charge and discharge test equipment meet the battery shipment standards, it is necessary to frequently calibrate the voltage accuracy and current accuracy of the battery charge and discharge test equipment.

[0007] The calibration process for battery charge and discharge test equipment is complex, involving multiple calibration points. The charge voltage, charge current, and discharge current must be calibrated separately. Currently, calibration of charge and discharge test equipment is mostly done manually. This is inefficient and prone to operational errors when faced with the large number of test equipment calibrations required. This impacts the calibration efficiency of the test equipment, and consequently, the production capacity of lithium batteries. Summary of the Invention

[0008] The present disclosure aims to provide a calibration method for battery charge and discharge test equipment that can automatically calibrate the battery charge and discharge test equipment to improve calibration efficiency and thereby increase battery production capacity.

[0009] To achieve the above objectives, the present disclosure discloses a battery charge and discharge test equipment calibration method, which is characterized by comprising:

[0010] Providing a standard power supply and a control terminal for simulating the load of a battery charge and discharge test device, wherein the control terminal is communicatively connected to the standard power supply and the test device via a communication network;

[0011] The control terminal reads the standard electrical parameters output by the standard power supply and the test electrical parameters output by the test device, and compares the standard electrical parameters with the test electrical parameters to obtain a calibration coefficient;

[0012] The calibration coefficients are transmitted to the test device so that the test device is calibrated based on the calibration coefficients.

[0013] Preferably, the standard power supply includes a standard voltage source electrically connected to each channel of the test equipment, and the control terminal compares the standard voltage output by the standard voltage source with the test voltage output by the test equipment to obtain a first calibration coefficient, and calibrates the voltage accuracy of the test equipment based on the first calibration coefficient.

[0014] Preferably, the standard voltage source is a precision-adjustable voltage source, which can output standard voltages under different standards to calibrate test equipment according to test requirements of batteries at different voltage levels.

[0015] Preferably, the standard power supply also includes an AC / DC bidirectional adjustable power supply electrically connected to each channel of the test device. When the test device is in a charging test state, the control terminal reads the charging current output by the test device to the AC / DC bidirectional adjustable power supply to obtain a second calibration coefficient. When the test device is in a discharging test state, the control terminal reads the discharging current output by the AC / DC bidirectional adjustable power supply to the test device to obtain a third calibration coefficient. The charging current accuracy of the test device is calibrated based on the second calibration coefficient, and the discharge current accuracy of the test device is calibrated based on the third calibration coefficient.

[0016] Furthermore, the standard current source also includes a current measuring device, which is used to detect the current value output or received by the AC / DC bidirectional adjustable power supply, and the control terminal is electrically connected to the current measuring device through a communication network to read the current value detected by the current measuring device.

[0017] Furthermore, the current measuring device includes a Hall sensor and a multimeter, the Hall sensor is connected in series in the current path between the AC / DC bidirectional adjustable power supply and the testing device, the multimeter is electrically connected to the Hall sensor, and the multimeter is communicatively connected to the control terminal. The multimeter converts the analog current value output by the Hall sensor into a digital value and transmits it to the control terminal.

[0018] Preferably, the control terminal includes a host computer and a switch, and the host computer is communicatively connected to the test equipment and the standard power supply respectively through the switch.

[0019] The present disclosure also discloses a calibration system for battery charge and discharge testing equipment, characterized in that the calibration system operates based on the above-mentioned calibration method.

[0020] The present disclosure also discloses a calibration system for battery charge and discharge test equipment, which is characterized by comprising:

[0021] one or more processors;

[0022] Memory; and

[0023] One or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, the programs comprising instructions for executing the calibration method as described above.

[0024] The present disclosure also discloses a computer-readable storage medium, characterized in that it includes a computer program, and the computer program can be executed by a processor to complete the calibration method as described above.

[0025] Compared with the prior art, the calibration method disclosed in the above technical solution of the present disclosure has the following beneficial technical effects:

[0026] 1. It realizes automatic calibration of charge and discharge test equipment with standardized operation process, high calibration stability and accuracy, and avoids calibration accidents caused by operational and calculation errors that may occur during manual calibration;

[0027] 2. It can realize unattended operation, which reduces the calibration cost of charge and discharge test equipment and improves the calibration efficiency. The battery testing and final shipment output and expectations become controllable, and fast and orderly production is achieved while ensuring product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] FIG1 is a flow chart of a calibration method in an embodiment of the present disclosure.

[0029] FIG2 is a flow chart of the re-inspection method in an embodiment of the present disclosure.

[0030] FIG3 is a schematic diagram of the calibration system structure in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0031] To illustrate the technical content, structural features, achieved objectives and effects of the present disclosure in detail, the following is a detailed description in conjunction with the embodiments and accompanying drawings.

[0032] This embodiment discloses a calibration method for a battery charge and discharge test device to automatically calibrate its charging voltage, charging current, and discharging current. As shown in FIG1 and FIG3 , the calibration method in this embodiment includes the following steps:

[0033] S101: Provide a standard power supply PS and a control terminal CT for simulating the load of a battery charge and discharge test equipment TE. The control terminal CT is connected to the standard power supply PS and the test equipment TE via a communication network. The control terminal CT is used to control the calibration process of the standard power supply PS and the test equipment TE.

[0034] S102: During the test, the control terminal CT reads the standard electrical parameters output by the standard power supply PS and the test electrical parameters output by the test equipment TE, and compares the standard electrical parameters with the test electrical parameters to obtain a calibration coefficient.

[0035] S103: The control terminal CT transmits the calibration coefficient to the test equipment TE via the communication network, so that the test equipment TE performs calibration based on the calibration coefficient.

[0036] In the calibration method provided in the above embodiment, a standard power supply PS is provided as the load for the test equipment TE. The control terminal CT reads the test electrical parameters of the test equipment TE and compares them with the standard electrical parameters to derive calibration coefficients. The test equipment TE is then calibrated based on these calibration coefficients. This calibration method automatically calibrates the electrical parameter accuracy of the test equipment TE, ensuring calibration accuracy while reducing calibration costs.

[0037] It should also be noted that after each calibration of the test equipment TE, it is often necessary to recheck the accuracy of the test equipment TE, that is, to check whether the accuracy of the calibrated test equipment TE meets the shipping standard. If the test equipment TE does not meet the shipping standard, the test equipment TE is controlled to be recalibrated until the error value between the test electrical parameters it outputs and the standard electrical parameters generated by the standard power supply PS is within the preset error range. As shown in Figure 2, the specific steps of the recheck method are as follows:

[0038] S201: The control terminal CT calculates the error value between the test electrical parameters output by the current test equipment TE and the standard electrical parameters.

[0039] S202: Determine whether the error value calculated in step S201 is within a preset error range. If so, proceed to step S2021; if not, proceed to step S2022.

[0040] S2021: End calibration of the test equipment TE.

[0041] S2022: Calibrate the test equipment TE again.

[0042] Specifically, the calibration method can also be divided into a voltage accuracy calibration method and a current accuracy calibration method of the test equipment TE, so as to calibrate the voltage accuracy or current accuracy of the test equipment TE separately. That is, when one of the voltage accuracy and current accuracy of the test equipment TE has met the shipment standard, only the side that does not meet the shipment standard is calibrated to simplify the calibration steps and improve the calibration efficiency of the test equipment TE.

[0043] On one hand, the standard power supply PS includes a standard voltage source electrically connected to each channel of the test equipment TE. The standard voltage source can act as a battery load for the test equipment TE and output a standard voltage. When the standard voltage source is connected to the test equipment TE, the test equipment TE outputs a test voltage. In the voltage calibration method, the test equipment TE is connected to the standard voltage source, and the control terminal CT reads the standard voltage output by the standard voltage source and the test voltage output by the test equipment TE. The obtained standard voltage and test voltage are compared to obtain a first calibration coefficient. The control terminal CT sends the first calibration coefficient to the test equipment TE, which receives the first calibration coefficient and calibrates the voltage accuracy based on the first calibration coefficient.

[0044] Furthermore, in this embodiment, the standard voltage source is a precision-adjustable voltage source PS1 , which can output standard voltages under different standards to calibrate the test equipment TE according to the test requirements of the battery at different voltage levels.

[0045] On the other hand, the standard power supply PS further includes an AC / DC bidirectional adjustable power supply PS2 electrically connected to each channel of the test equipment TE to calibrate the current accuracy of the test equipment TE.

[0046] The calibration of the TE current accuracy of the test equipment includes the calibration of the charging current accuracy and the calibration of the discharge current accuracy.

[0047] When the test equipment TE is in a charging test state, the AC / DC bidirectional adjustable power supply PS2 acts as a load for the test equipment TE and receives the charging current output by the test equipment TE. The control terminal CT reads the standard charging current at the input end of the AC / DC bidirectional adjustable power supply PS2 and the charging test current output by the test equipment TE, and compares the two to obtain a second calibration coefficient. The control terminal CT sends the second calibration coefficient to the test equipment TE, and the test equipment TE completes calibration of the charging current accuracy based on the second calibration coefficient.

[0048] When the test equipment TE is in the discharge test state, the AC / DC bidirectional adjustable power supply PS2 simulates the battery discharging to the test equipment. The control terminal CT reads the standard discharge current at the output end of the AC / DC bidirectional adjustable power supply PS2 and the discharge test current output by the test equipment TE, and compares the two to obtain a third calibration coefficient. The control terminal CT sends the third calibration coefficient to the test equipment TE, and the test equipment TE completes the calibration of the discharge current accuracy based on the third calibration coefficient.

[0049] Furthermore, the AC / DC bidirectional adjustable power supply PS2 is also connected to a current measuring device ME, which is used to detect the current value output or received by the AC / DC bidirectional adjustable power supply PS2. When the test device TE is in the charging test state, the current measuring device ME is responsible for measuring the standard charging current value. When the test device TE is in the discharging test state, the current measuring device ME is responsible for measuring the standard discharging current value.

[0050] In this embodiment, the battery measuring device includes a Hall sensor HS and a multimeter M. The Hall sensor HS is connected in series in the current path between the AC / DC bidirectional adjustable power supply PS2 and the test equipment TE. The multimeter M is electrically connected to the Hall sensor HS and communicatively connected to the control terminal CT. When the test equipment TE is in a charging test state, the Hall sensor HS outputs the measured analog current value of the standard charging current. The multimeter M converts the received analog current value of the standard charging current into a digital value and transmits it to the control terminal CT. When the test equipment TE is in a discharging test state, the Hall sensor HS outputs the measured analog current value of the standard discharging current. The multimeter M converts the received analog current value of the standard discharging current into a digital value and transmits it to the control terminal CT.

[0051] It's worth noting that a switching device S exists between the test equipment TE and the standard power supply PS. This switching device S includes a first switch S1, a second switch S2, a third switch S3, and a fourth switch S4, all of which are normally open. The positive electrode of each channel in the test equipment TE is electrically connected to the Hall sensor HS via the first switch S1 and to the precision-adjustable voltage source PS1 via the third switch S3. The negative electrode of each channel in the test equipment TE is electrically connected to the AC / DC bidirectional adjustable power supply PS2 via the second switch S2 and to the precision-adjustable voltage source PS1 via the fourth switch S4.

[0052] When the test equipment TE performs voltage accuracy calibration, the first switch S1 and the second switch S2 are opened, the third switch S3 and the fourth switch S4 are closed, and each channel in the test equipment TE is electrically connected to the precision adjustable voltage source PS1 to output the test voltage.

[0053] When the test equipment TE is in the charging test state, the first switch S1 and the second switch S2 are closed, the third switch S3 and the fourth switch S4 are opened, and the AC / DC bidirectional adjustable power supply PS2 receives the charging current output by the test equipment TE through the path between each channel in the test equipment TE and the AC / DC bidirectional adjustable power supply PS2.

[0054] When the test equipment TE is in a discharge test state, the first switch S1 and the second switch S2 are closed, the third switch S3 and the fourth switch S4 are opened, and the AC / DC bidirectional adjustable power supply PS2 simulates a battery and discharges to the test equipment TE through the paths between each channel in the test equipment TE and the AC / DC bidirectional adjustable power supply PS2 to obtain a discharge test current.

[0055] On the other hand, the control terminal CT includes a host computer UC and a switch S. In this embodiment, the host computer UC is connected to the standard power supply PS through the switch S to read the standard electrical parameters, and is also connected to the test equipment TE through the switch S to control the test equipment TE to enter different calibration states, and send sampling instructions to the test equipment TE to read the test electrical parameters. During the calibration process of the test equipment TE, the host computer UC compares the standard electrical parameters and the test electrical parameters and calculates the calibration coefficient, and then sends the calibration coefficient to the test equipment TE so that the test equipment TE performs self-calibration based on the calibration system. In addition, when re-inspecting the test equipment TE, the host computer UC is responsible for calculating the error value between the test electrical parameters output by the test equipment TE and the standard electrical parameters after each calibration to verify whether the test equipment TE has met the shipping standards. If not, the test equipment TE is controlled to enter the calibration state again.

[0056] In addition, it also includes a serial port server SPS. The host computer UC and the test equipment TE are connected through the switch S and the serial port server SPS. The serial port server SPS is used to transmit the test electrical parameters generated by each channel of the test equipment TE to the host computer UC.

[0057] In another preferred embodiment of the present disclosure, a calibration system for battery charge and discharge testing equipment is also disclosed. The calibration system operates based on the above calibration method.

[0058] The present disclosure also discloses another calibration system for battery charge and discharge test equipment, which includes one or more processors, a memory, and one or more programs, wherein the one or more programs are stored in the memory and are configured to be executed by the one or more processors, and the programs include instructions for executing the calibration method described above. The processor can adopt a general central processing unit (CPU), a microprocessor, an application-specific integrated circuit (ASIC), or one or more integrated circuits to execute relevant programs to implement the functions required to be performed by the modules in the calibration system of the embodiment of the present application, or to execute the calibration method of the method embodiment of the present application.

[0059] The present disclosure also discloses a computer-readable storage medium, which includes a computer program, and the computer program can be executed by a processor to perform the calibration method described above. The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server or data center that includes one or more available media. The available medium can be a read-only memory (ROM), or a random access memory (RAM), or a magnetic medium, such as a floppy disk, a hard disk, a tape, a magnetic disk, or an optical medium, such as a digital versatile disc (DVD), or a semiconductor medium, such as a solid state disk (SSD).

[0060] The present application also discloses a computer program product or computer program, which includes computer instructions stored in a computer-readable storage medium. A processor of an electronic device reads the computer instructions from the computer-readable storage medium and executes the computer instructions, causing the electronic device to perform the calibration method described above.

[0061] The above disclosure is merely a preferred embodiment of the present disclosure, and certainly cannot be used to limit the scope of rights of the present disclosure. Therefore, equivalent changes made according to the scope of the patent application of the present disclosure are still within the scope covered by the present disclosure.

Claims

1. A calibration method for battery charge and discharge test equipment, characterized in that: include: Provide a standard power supply and a control terminal for simulating the load of a battery charge and discharge test device, wherein the control terminal is connected to the standard power supply and the test device through a communication network; The control terminal reads the standard electrical parameters output by the standard power supply and the test electrical parameters output by the test device, and compares the standard electrical parameters with the test electrical parameters to obtain a calibration coefficient; The calibration coefficients are transmitted to the test device so that the test device is calibrated based on the calibration coefficients.

2. The calibration method of battery charge and discharge test equipment according to claim 1, characterized in that: The standard power supply includes a standard voltage source electrically connected to each channel of the test equipment. The control terminal compares the standard voltage output by the standard voltage source with the test voltage output by the test equipment to obtain a first calibration coefficient, and calibrates the voltage accuracy of the test equipment based on the first calibration coefficient.

3. The calibration method of the battery charge and discharge test equipment according to claim 2, characterized in that: The standard voltage source is a precision adjustable voltage source.

4. The calibration method of battery charge and discharge test equipment according to claim 1, characterized in that: The standard power supply also includes an AC / DC bidirectional adjustable power supply electrically connected to each channel of the test device. When the test device is in a charging test state, the control terminal reads the charging current output by the test device to the AC / DC bidirectional adjustable power supply to obtain a second calibration coefficient. When the test device is in a discharging test state, the control terminal reads the discharging current output by the AC / DC bidirectional adjustable power supply to the test device to obtain a third calibration coefficient. The charging current accuracy of the test device is calibrated based on the second calibration coefficient, and the discharge current accuracy of the test device is calibrated based on the third calibration coefficient.

5. The calibration method of the battery charge and discharge test equipment according to claim 4, characterized in that: It also includes a current measuring device, which is used to detect the current value output or received by the AC / DC bidirectional adjustable power supply. The control terminal is electrically connected to the current measuring device through a communication network to read the current value detected by the current measuring device.

6. The calibration method of battery charge and discharge test equipment according to claim 5, characterized in that: The current measuring device includes a Hall sensor and a multimeter. The Hall sensor is connected in series in the current path between the AC / DC bidirectional adjustable power supply and the test device. The multimeter is electrically connected to the Hall sensor. The multimeter is communicatively connected to the control terminal. The multimeter converts the analog current value output by the Hall sensor into a digital value and transmits it to the control terminal.

7. The calibration method of battery charge and discharge test equipment according to claim 1, characterized in that: The control terminal includes a host computer and a switch, and the host computer is respectively connected to the test equipment and the standard power supply through the switch.

8. A calibration system for battery charge and discharge test equipment, characterized in that: The calibration system works based on the calibration method according to any one of claims 1 to 7.

9. A calibration system for battery charge and discharge test equipment, characterized in that: include: one or more processors; Memory; as well as One or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, the programs comprising instructions for executing the calibration method according to any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that: The method comprises a computer program which can be executed by a processor to implement the calibration method according to any one of claims 1 to 7.

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