A calibration device and method for a battery charge and discharge tester

Abstract

The application discloses a kind of calibration device and method for battery charge-discharge tester, including control module, and with the battery charge-discharge tester, current switching module, voltage switching module and project switching switch module of control module electricity connection, control module is closed or opened by controlling the switch tube in project switching control unit, so that electronic load or analog battery is connected with battery charge-discharge tester, realizes the quick flexible configuration of battery test condition under charge test scene and discharge test scene, and uses the current data, voltage data and power data of multiple channels collected by current switching module or voltage switching module, realizes the data of multiple channels parallel acquisition, so as to judge whether the channel needs to be calibrated according to the data collected, effectively improve the accuracy and efficiency of battery charge-discharge tester calibration.

Description

Technical Field

[0001] This invention relates to the field of battery charge and discharge testing technology, and in particular to a calibration device and method for a battery charge and discharge tester. Background Technology

[0002] A battery charge-discharge tester is a specialized device used to comprehensively test, analyze, and evaluate the charge-discharge performance of energy storage devices such as batteries and capacitors. It is widely used in battery research and development, production quality inspection, performance verification, and aging testing. However, existing calibration devices for charge-discharge testers still have many shortcomings. For example, manual wiring of each channel and switching of power supplies and electronic loads is required, which is not only time-consuming but also prone to introducing wiring errors. Conventional testing methods often rely on single-point or low-precision measurements, making it difficult to guarantee the accuracy and repeatability of multi-channel current and voltage data. Most existing systems use a single-channel, rotating measurement method, which, due to the need to wait for current and voltage stabilization, has significantly insufficient testing efficiency and introduces considerable uncertainty. In summary, existing charge-discharge tester calibration devices suffer from hardware resource redundancy and a single data acquisition method, making it difficult to meet the requirements for high-precision and high-efficiency testing. Summary of the Invention

[0003] To address the aforementioned technical problems, this invention provides a calibration device and method for a battery charge-discharge tester, thereby resolving the issues of low accuracy and low efficiency in existing charge-discharge tester calibration devices.

[0004] A first aspect of the present invention provides a calibration apparatus for a battery charge-discharge tester, the apparatus comprising: The control module, along with the battery charge / discharge tester, current switching module, voltage switching module, and project switching switch module connected to the control module, needs a brief explanation regarding its role in controlling the battery charge / discharge tester; this should not be too obvious. in, The battery charge and discharge tester includes multiple channel ports. The project switching module includes a project switching control unit, as well as an electronic load and a simulated battery connected to the project switching control unit. The current switching module, voltage switching module, and project switching control unit each include at least one switching transistor. The current switching module, voltage switching module, and project switching control unit are all connected to each channel port of the battery charge-discharge tester; The control module controls the closing or opening of the switching transistors in the project switching control unit. After the electronic load or simulated battery is connected to the battery charge / discharge tester, it controls the battery charge / discharge tester to charge the electronic load or receive the current output from the simulated battery. At the same time, it controls the current switching module and / or voltage switching module to collect the current data and / or voltage data of each channel. Based on the collected current or voltage data of each channel and the corresponding preset electrical parameter values, it determines whether each channel needs to be calibrated. Based on the collected current and voltage data of each channel, it calculates the power of each channel and determines whether each channel needs to be calibrated based on the power of each channel and the preset power threshold.

[0005] In one possible implementation of the first aspect, multiple digital multimeters are also included, wherein the current switching module and the voltage switching module are respectively connected to the corresponding digital multimeters. The digital multimeter is used to collect the current or voltage data of the corresponding channel of the switching transistor after the current switching module or voltage switching module closes the switching transistor according to the preset switching method, and to send the collected current and voltage data to the control module.

[0006] In one possible implementation of the first aspect, both the current switching module and the voltage switching module include a first preset number of switching units, wherein, The switching unit includes a main switching subunit and a second preset number of auxiliary switching subunits, wherein, The first end of the main switching subunit is directly connected to the digital multimeter, the second end of the main switching subunit is connected to the first end of each auxiliary switching subunit, and the second end of each auxiliary switching subunit is connected to the corresponding channel port. The second preset number is the ratio of the total number of channel ports of the charge-discharge tester to the first preset number.

[0007] In one possible implementation of the first aspect, the main switching subunit includes a first switching transistor, and the auxiliary switching subunit includes a second switching transistor and a third switching transistor, wherein, The first terminal of the first switch is connected to the digital multimeter, the second terminal of the first switch is connected to the first terminal of the second switch, the second terminal of the second switch is connected to the first terminal of the third switch, and the second terminal of the third switch is connected to the corresponding channel port.

[0008] In one possible implementation of the first aspect, the project switching control unit includes multiple gating switches; The output terminals of the electronic load and the analog battery are connected to the input terminals of each selector switch, and the output terminals of each selector switch are connected to the corresponding channel ports.

[0009] In one possible implementation of the first aspect, the gating switch includes a first position, a second position, and a third position; When the battery charge and discharge tester performs a charging test, close the first position of each selector switch to connect the electronic load to the battery charge and discharge tester. When the battery charge and discharge tester performs a discharge test, close the third position of each selector switch to connect the simulated battery to the battery charge and discharge tester. When the battery charge / discharge tester is not performing tests, close the second position of each selector switch to stop the test.

[0010] In one possible implementation of the first aspect, the preset electrical parameter values ​​include a preset current threshold and a preset voltage threshold, wherein, The preset current threshold is the current value displayed on the screen when the charge / discharge tester is charging an electronic load or receiving current output from a simulated battery; The preset voltage threshold is the voltage value displayed on the screen when the charge / discharge tester is charging an electronic load or receiving current from a simulated battery. The preset power threshold is calculated by the current and voltage values ​​displayed on the screen when the charge / discharge tester charges the electronic load or receives the current output from the simulated battery.

[0011] To address the same technical problem, a second aspect of the present invention provides a calibration method for a battery charge / discharge tester, comprising: In response to the generated charging test command, the control item switching control unit connects the electronic load to the charge / discharge tester; The switching units in the control current switching module or voltage switching module are closed sequentially, and the digital multimeter is controlled to collect the current data or voltage data of each channel. Receive current or voltage data collected by a digital multimeter, calculate the difference between the current or voltage data of each channel and the preset electrical parameter threshold, and determine whether the difference is less than the maximum permissible error of the electrical parameter. If it is less than, the channel is deemed qualified; if it is greater than or equal to the maximum permissible error of the electrical parameter, the channel is deemed unqualified and the channel is calibrated.

[0012] One possible implementation of the first aspect also includes: In response to the generated discharge test command, the control item switching control unit connects the simulated battery to the charge / discharge tester; The switching units in the control current switching module or voltage switching module are closed sequentially, and the digital multimeter is controlled to collect the current data or voltage data of each channel. Receive current or voltage data collected by a digital multimeter, calculate the difference between the current or voltage data of each channel and the preset electrical parameter threshold, and determine whether the difference is less than the maximum permissible error of the electrical parameter. If it is less than, the channel is deemed qualified; if it is greater than or equal to the maximum permissible error of the electrical parameter, the channel is deemed unqualified and the channel is calibrated.

[0013] One possible implementation of the first aspect also includes: In response to the generated power test command, the control item switching control unit connects the simulated battery to the charge / discharge tester; The switching units in the current switching module are closed sequentially, and the digital multimeter is controlled to collect the current data of each channel. The switching units in the control voltage switching module are closed sequentially, and the digital multimeter is controlled to collect voltage data from each channel. It receives current and voltage data collected by a digital multimeter and calculates the power of each channel based on the current and voltage data of each channel. Calculate the difference between the power of each channel and the preset power threshold to obtain the power difference value, and determine whether the power difference value is less than the maximum permissible power error. If it is less than the maximum permissible power error, the channel is deemed qualified. If it is greater than or equal to the maximum permissible power error, the channel is deemed unqualified and the channel is calibrated.

[0014] The technical solution of this invention has the following advantages: The calibration device for a battery charge / discharge tester provided in this invention includes a control module, a battery charge / discharge tester, a current switching module, a voltage switching module, and a project switching switch module electrically connected to the control module. Specifically, the battery charge / discharge tester includes multiple channel ports, the project switching module includes a project switching control unit, and an electronic load and a simulated battery connected to the project switching control unit. Each of the current switching module, voltage switching module, and project switching control unit includes at least one switching transistor. Each of the current switching module, voltage switching module, and project switching control unit is connected to each channel port of the battery charge / discharge tester. In this device, the control module controls the switching transistor in the project switching control unit to close or open, connecting the electronic load or simulated battery to the battery charge / discharge tester. This enables rapid and flexible configuration of battery test conditions in charging and discharging test scenarios. Furthermore, by using the current switching module or voltage switching module to collect current, voltage, and power data from multiple channels, parallel data acquisition across multiple channels is achieved. Based on the collected data, it is determined whether calibration of the battery charge / discharge tester is necessary, improving the accuracy and efficiency of the calibration. Attached Figure Description

[0015] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0016] Figure 1 This is a schematic flowchart of the device structure of the calibration apparatus for the battery charge-discharge tester in an embodiment of the present invention; Figure 2 This is a schematic diagram of the technical route for the specific structural connection of the calibration device for the battery charge-discharge tester in an embodiment of the present invention; Figure 3 This is a schematic diagram of the current switching module structure of the calibration device for the battery charge-discharge tester in an embodiment of the present invention; Figure 4 This is a schematic diagram of the voltage switching module structure of the calibration device for the battery charge-discharge tester in an embodiment of the present invention; Figure 5 This is a schematic diagram of the item switching control unit of the calibration device for the battery charge-discharge tester in an embodiment of the present invention; Figure 6 This is a flowchart of a calibration method for a battery charge / discharge tester in an embodiment of the present invention; Figure 7 This is a flowchart illustrating the current data acquisition process of the calibration method for a battery charge / discharge tester in an embodiment of the present invention. Figure 8 This is a flowchart illustrating the voltage data acquisition process of the calibration method for a battery charge / discharge tester in an embodiment of the present invention. Figure 9 This is a flowchart illustrating the power data acquisition process of the calibration method for a battery charge / discharge tester in an embodiment of the present invention. Reference numerals: 100, control module; 200, battery charge / discharge tester connected to the control module; 300, current switching module; 400, voltage switching module; 500, project switching switch module. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] In the description of this invention, it should be noted that the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0019] Figure 1 This invention provides a calibration device for a battery charge / discharge tester. The invention also provides a calibration device for a battery charge / discharge tester, such as... Figure 1 As shown, the device includes a control module 100, a battery charge / discharge tester 200, a current switching module 300, a voltage switching module 400, and a project switching switch module 500, all electrically connected to the control module.

[0020] Figure 2 This is a schematic diagram showing the specific structure and connection of the calibration device for a battery charge / discharge tester provided in an embodiment of the present invention. Figure 2The battery charge / discharge tester includes multiple channel ports. The project switching module includes a project switching control unit, an electronic load, and a simulated battery connected to the project switching control unit. The current switching module, voltage switching module, and project switching control unit each include at least one switching transistor. Each of these modules is connected to a channel port of the battery charge / discharge tester. The control module controls the switching transistor in the project switching control unit to close or open, allowing the electronic load or simulated battery to connect to the tester. It then controls the tester to charge the electronic load or receive current from the simulated battery. Simultaneously, it controls the current switching module and / or voltage switching module to collect current and / or voltage data from each channel. Based on the collected current or voltage data and corresponding preset electrical parameter values, it determines whether each channel requires calibration. Furthermore, based on the collected current and voltage data, it calculates the power of each channel and determines whether calibration is required based on the power of each channel and a preset power threshold. Specifically, the battery charge / discharge tester, the project switching control unit in the project switching module, the electronic load, and the simulated battery establish a communication link with the control module through a communication interface for data transmission and control signal transmission. The control module outputs control commands based on a predetermined strategy to control the working state of the battery charge / discharge tester, the project switching control unit, the electronic load, and the simulated battery. For example, when the control module outputs a control command to start charging test calibration, it controls the project switching control unit to connect the electronic load to the charge / discharge tester, and simultaneously controls the charge / discharge tester to act as a charger for the electronic load, charging it with the current output by the electronic load to complete the charging process. When the control module outputs a control command to start discharging test calibration, it controls the project switching control unit to connect the simulated battery to the charge / discharge tester, and simultaneously controls the charge / discharge tester to act as an external load, receiving the output current of the simulated battery to complete the discharging process. During the calibration process of the battery charge / discharge tester, the electronic load simulates the consumption of the battery or power supply by actual electrical equipment. It can accurately absorb electrical energy through constant current, constant voltage, constant power, or constant resistance operating modes to verify the accuracy and stability of the tester in discharge measurement, power control, and dynamic response, thereby ensuring the reliability of the test results under different load conditions. Simulated batteries provide stable, controllable, and repeatable battery characteristics to ensure calibration accuracy and safety. They can simulate the voltage, current, and internal resistance characteristics of different types of batteries during charging and discharging, avoiding the uncertainties caused by aging, temperature changes, or safety risks of real batteries. This allows the tester to have higher efficiency and accuracy during calibration, while ensuring the reliability and repeatability of the results.

[0021] The battery charge / discharge tester includes multiple channels, each with a channel port for connecting to a current switching module, a voltage switching module, and a project switch switching module. The current and voltage switching modules also establish a communication link with the control module via a communication interface for data transmission and control signal transmission. The control module outputs control commands based on a predetermined strategy to control the closing or opening of the switching transistor in any one of the current and voltage switching modules, thereby acquiring current or voltage data. By setting up multiple channels, multi-point testing can be completed simultaneously without relying on single-channel switching, thus achieving parallelization of the testing process. This significantly shortens the testing cycle and improves overall efficiency, overcoming the shortcomings of single-channel switching, which requires waiting for current and voltage stabilization and leads to low testing efficiency. Each channel of the battery charge / discharge tester is connected to the corresponding switching unit in the current or voltage switching module through a channel port, forming multiple channels. When performing discharge or charge test calibration, closing the switching transistor in each channel of the current and voltage switching modules allows for the acquisition of current and voltage data from that channel.

[0022] In some implementations, the preset electrical parameter values ​​include a preset current threshold and a preset voltage threshold, wherein, The preset current threshold is the current value displayed on the screen when the charge / discharge tester is charging an electronic load or receiving current output from a simulated battery; The preset voltage threshold is the voltage value displayed on the screen when the charge / discharge tester is charging an electronic load or receiving current from a simulated battery. The preset power threshold is calculated by the current and voltage values ​​displayed on the screen when the charge / discharge tester charges the electronic load or receives the current output from the simulated battery.

[0023] In this embodiment, the preset electrical parameter values ​​include a preset current threshold and a preset voltage threshold. Both the preset current threshold and the predicted voltage threshold refer to the current and voltage values ​​displayed on the device's screen during the charging and discharging tester's operation of charging an electronic load or receiving simulated battery output current; that is, the values ​​output by the charging and discharging tester during the aforementioned operation. The preset power threshold is calculated from the current and voltage values ​​displayed on the charging and discharging tester's screen during the aforementioned operation.

[0024] In some implementations, multiple digital multimeters are also included, wherein the current switching module and the voltage switching module are respectively connected to the corresponding digital multimeters; The digital multimeter is used to collect the current or voltage data of the corresponding channel of the switching transistor after the current switching module or voltage switching module closes the switching transistor according to the preset switching method, and to send the collected current and voltage data to the control module.

[0025] In this embodiment, the current switching module and the voltage switching module are respectively connected to the corresponding digital multimeters, specifically, as follows: Figure 3 As shown, Figure 3 The diagram shows the structure of the current switching module. The first end of the current switching module is connected to a digital multimeter, and the second end of the current switching module is connected to the channel port of the charge / discharge tester. When performing discharge test calibration or charge test calibration, the switching transistor in the current switching module is closed, and each channel is turned on. The multimeter collects the corresponding current data through each channel.

[0026] like Figure 4 As shown, Figure 4 The diagram shows the structure of the voltage switching module. The first end of the voltage switching module is connected to a digital multimeter, and the second end of the voltage switching module is connected to the channel port of the charge / discharge tester. When performing discharge test calibration or charge test calibration, the switching transistor in the voltage switching module is closed, and each channel is turned on. The multimeter collects the corresponding voltage data through each channel.

[0027] In some embodiments, both the current switching module and the voltage switching module include a first preset number of switching units, wherein, The switching unit includes a main switching subunit and a second preset number of auxiliary switching subunits, wherein, The first end of the main switching subunit is directly connected to the digital multimeter, the second end of the main switching subunit is connected to the first end of each auxiliary switching subunit, and the second end of each auxiliary switching subunit is connected to the corresponding channel port. The second preset number is the ratio of the total number of channel ports of the charge-discharge tester to the first preset number.

[0028] In this embodiment, as Figure 3 and Figure 4 As shown, both the current switching module and the voltage switching module include a first preset number of switching units. Each switching unit includes a main switching subunit and a second preset number of auxiliary switching subunits. For example, when the total number of channel ports of the battery charge / discharge tester is 120, both the current switching module and the voltage switching module include 5 switching units. Each switching unit includes a main switching subunit and 24 auxiliary switching subunits. The main switching subunit acts as a master control switch. One end of it is directly connected to the multimeter, which is responsible for controlling whether the multimeter is connected to a channel. The other end is connected to multiple auxiliary switching subunits, which are connected in parallel. Each auxiliary switching subunit is connected to a corresponding channel port of the charge / discharge tester. The auxiliary switching subunit is responsible for controlling whether the corresponding channel is connected to the main switching subunit, thus allowing the digital multimeter to flexibly select the channel for which data needs to be collected.

[0029] It should be noted that the first preset number can be determined according to the voltage and current measurement range and the number of channels of the battery charge and discharge tester. Generally, the value range is 4 to 12. The current range of existing battery charge and discharge testers commonly covers 1mA to 1kA, and the voltage range commonly covers 1V to 1kV. When the current or voltage to be tested is larger, the number of switching units in the current switching module and the voltage switching module will also be more. Accurate calibration under different ranges can be achieved through multi-level switching units.

[0030] In some embodiments, the main switching subunit includes a first switch, and the auxiliary switching subunit includes a second switch and a third switch, wherein... The first terminal of the first switch is connected to the digital multimeter, the second terminal of the first switch is connected to the first terminal of the second switch, the second terminal of the second switch is connected to the first terminal of the third switch, and the second terminal of the third switch is connected to the corresponding channel port.

[0031] In this embodiment, the main switching subunit is mainly composed of a first switching transistor, and the auxiliary switching subunit is mainly composed of a second switching transistor and a third switching transistor, such as... Figure 3 and Figure 4 As shown, the first end of the first switching transistor is connected to the digital multimeter, the second end of the second switching transistor is connected to the first end of the second switching transistor, the second end of the second switching transistor is connected to the first end of the third switching transistor, and the third switching transistor is connected to the channel port of the charge-discharge tester.

[0032] In some implementations, the project switching control unit includes multiple gating switches; The output terminals of the electronic load and the analog battery are connected to the input terminals of each selector switch, and the output terminals of each selector switch are connected to the corresponding channel ports.

[0033] In this embodiment, as Figure 5 As shown, Figure 5 This is a schematic diagram of the project switching control unit. The project switching control unit includes multiple selector switches. The input terminal of each selector switch is connected to the output terminal of the electronic load or the output terminal of the analog battery. The output terminal of the selector switch is connected to the corresponding channel port of the charge-discharge tester. This is used to connect the electronic load or analog battery to each channel port, thereby realizing the output current or input current to the charge-discharge tester.

[0034] In some implementations, the selector switch includes a first position, a second position, and a third position; When the battery charge and discharge tester performs a charging test, close the first position of each selector switch to connect the electronic load to the battery charge and discharge tester. When the battery charge and discharge tester performs a discharge test, close the third position of each selector switch to connect the simulated battery to the battery charge and discharge tester. When the battery charge / discharge tester is not performing tests, close the second position of each selector switch to stop the test.

[0035] In this embodiment, the selector switch for each channel is designed with a three-position switching structure, specifically including a first position, a second position, and a third position. When charging test calibration is required, the control module controls all channel selector switches to switch to the first position and close it. At this time, the path corresponding to this position connects the electronic load module to the channel port of the battery charge / discharge tester. The electronic load simulates the power receiving load during battery charging, receiving the current output by the battery charge / discharge tester to test the battery charging process. When the battery discharge performance needs to be tested, the selector switch switches to the third position and closes it. At this time, the path corresponding to this position connects the simulated battery module to the channel port of the battery charge / discharge tester. The simulated battery simulates the power supply during battery discharge, inputting current to the battery charge / discharge tester to test the performance of the simulated battery and perform calibration. When the battery charge / discharge tester does not need to perform charge / discharge tests, the selector switch switches to the second position and closes it. At this time, the circuit corresponding to this position is in an open circuit or no-load state, which disconnects the electronic load from the simulated battery and also puts the tester channel port in a state of no power connection, thereby pausing the charging and discharging test process and protecting the equipment in standby mode.

[0036] This invention provides a control module, and a battery charge / discharge tester, a current switching module, a voltage switching module, and a project switching switch module connected to the control module. The battery charge / discharge tester includes multiple channel ports. The project switching module includes a project switching control unit, an electronic load, and a simulated battery connected to the project switching control unit. Each of the current switching module, voltage switching module, and project switching control unit includes at least one switching transistor. Each of the current switching module, voltage switching module, and project switching control unit is connected to each channel port of the battery charge / discharge tester. The control module compares the current or voltage data collected by the current or voltage switching module for each channel with corresponding preset electrical parameter values ​​to determine whether the electronic load or simulated battery corresponding to the channel needs calibration. It also calculates the power of each channel based on the collected current and voltage data and compares the power of each channel with preset power values ​​to determine whether the electronic load or simulated battery corresponding to the channel needs calibration, thus achieving accurate charge / discharge testing and calibration of the battery or electronic load.

[0037] In one embodiment, such as Figure 6As shown, this embodiment of the invention provides a calibration method for a battery charge-discharge tester, applying the calibration method for a battery charge-discharge tester as described above. The method includes the following steps: S1. In response to the generated charging test command, the control item switching control unit connects the electronic load to the charge / discharge tester; S2. Control the switching units in the current switching module or voltage switching module to close sequentially, and control the digital multimeter to collect the current data or voltage data of each channel. S3. Receive current or voltage data collected by digital multimeter, calculate the difference between the current or voltage data of each channel and the preset electrical parameter threshold, and determine whether the difference is less than the maximum permissible error of the electrical parameter. If it is less than, the channel is deemed qualified; if it is greater than or equal to the maximum permissible error of the electrical parameter, the channel is deemed unqualified and the channel is calibrated.

[0038] In this embodiment, after the control module receives the test procedure to start charging, it will automatically execute the test and calibration process according to the following steps: First, it sends a charging control signal to the project switching control unit, driving its internal selector switch to the first position, connecting the electronic load to each channel port of the battery charge and discharge tester. At this time, the electronic load will simulate the power consumption scenario during battery charging, providing a load environment for subsequent charging tests. Figure 7 and Figure 8 As shown, Figure 7 This is a flowchart of the current data acquisition process. Figure 8The voltage data acquisition flowchart illustrates that after the test link is ready, the control module controls the switching units in the current switching module or voltage switching module to switch paths in turn according to a preset sequence. For example, when acquiring current data, the third switch is first switched to the third position, then all the first switches are closed. After waiting for the first preset time, the real-time current change area is stabilized or fluctuates within a preset allowable range. Then, the second switch in the first auxiliary switching unit of each switching unit is closed, allowing the digital multimeter to acquire current data according to a preset sampling frequency. After waiting for the second preset time, the second switch in the second auxiliary switching unit of each switching unit is closed, allowing the digital multimeter to acquire current data for each channel according to a preset sampling frequency. The above process is repeated until the current data for all channels has been acquired. When acquiring voltage data, the third switch is first switched to the second position, then all the first switches are closed. After waiting for a first preset time, the real-time voltage change area is stabilized or fluctuates within a preset allowable range. Then, the second switch in the first auxiliary switching unit of each switching unit is closed, allowing the digital multimeter to acquire voltage data at a preset sampling frequency. After waiting for a second preset time, the second switch in the second auxiliary switching unit of each switching unit is closed, allowing the digital multimeter to acquire voltage data at a preset sampling frequency. The above process is repeated until the voltage data of all channels is acquired. This method achieves full coverage acquisition of multi-channel current and voltage data.

[0039] It should be noted that when the digital multimeter collects current data from each channel at a preset sampling frequency, for example, if the preset sampling frequency is set to collect one data point every 0.2 seconds, then each channel will collect 5 data points. The average of these 5 data points is then taken as the final current data collected from each channel. The calculation method for the final voltage data is the same as that for the final current data, and will not be repeated in this embodiment.

[0040] After acquiring current or voltage data, the data is sent to the control module. The final current or voltage data from each channel is compared with preset electrical parameter thresholds. For example, after acquiring current data, the difference between the final current data for each channel and the preset current threshold is calculated. If this difference is greater than or equal to the maximum permissible current error, the channel is considered unqualified and requires calibration. If the difference is less than the maximum permissible current error, the channel is considered qualified and does not require calibration. Similarly, after acquiring voltage data, the difference between the final voltage data for each channel and the preset voltage threshold is calculated. If this difference is greater than or equal to the maximum permissible voltage error, the channel is considered unqualified and requires calibration. If the difference is less than the maximum permissible voltage error, the channel is considered qualified and does not require calibration.

[0041] It should be noted that when calibrating a channel, you can choose to repair the channel or use the device software to correct the channel's internal parameters based on the measured value of a standard (8.5-digit multimeter) so that its reading matches the measured value of the standard.

[0042] In one embodiment, the method further includes the following steps: In response to the generated discharge test command, the control item switching control unit connects the simulated battery to the charge / discharge tester; The switching units in the control current switching module or voltage switching module are closed sequentially, and the digital multimeter is controlled to collect the current data or voltage data of each channel. Receive current or voltage data collected by a digital multimeter, calculate the difference between the current or voltage data of each channel and the preset electrical parameter threshold, and determine whether the difference is less than the maximum permissible error of the electrical parameter. If it is less than, the channel is deemed qualified; if it is greater than or equal to the maximum permissible error of the electrical parameter, the channel is deemed unqualified and the channel is calibrated.

[0043] In this embodiment, after the control module generates a discharge test start command, it automatically executes the test and calibration process according to the following steps: First, it sends a discharge control signal to the project switching control unit, driving its internal selector switch to the third position, connecting the simulated battery to each channel port of the battery charge / discharge tester. At this time, the simulated battery will simulate the discharge scenario during battery discharge, providing a power environment for subsequent discharge tests. After the test link is ready, the process of the control module controlling the current switching module or voltage switching module to perform data acquisition is the same as the process during charging tests, and will not be described again in this embodiment.

[0044] In one embodiment, the method further includes the following steps: In response to the generated power test command, the control item switching control unit connects the simulated battery to the charge / discharge tester; The switching units in the current switching module are closed sequentially, and the digital multimeter is controlled to collect the current data of each channel. The switching units in the control voltage switching module are closed sequentially, and the digital multimeter is controlled to collect voltage data from each channel. It receives current and voltage data collected by a digital multimeter and calculates the power of each channel based on the current and voltage data of each channel. Calculate the difference between the power of each channel and the preset power threshold to obtain the power difference value, and determine whether the power difference value is less than the maximum permissible power error. If it is less than the maximum permissible power error, the channel is deemed qualified. If it is greater than or equal to the maximum permissible power error, the channel is deemed unqualified and the channel is calibrated.

[0045] In this embodiment, as Figure 9 As shown Figure 9 is the flow chart of power data acquisition. After the control module generates the start power test instruction, it sends a power test control signal to the project switching control unit. After receiving the power test control signal, the project switching control unit drives the internal strobe switch to switch to the third gear, stably connecting the simulated battery to each channel port of the battery charge and discharge tester. At this time, the simulated battery will simulate the power supply state during actual operation, providing a power supply environment that conforms to the real working conditions for power testing. After the link is ready, the control module starts data acquisition. First, it controls the current switching module to acquire current data. The acquisition method is the same as that of the current data during charging test, which will not be elaborated in this embodiment. Then it controls the voltage switching module to acquire voltage data. The acquisition method is the same as that of the voltage data during charging test, which will not be elaborated in this embodiment. Since the switching time of each switch in the current switching matrix and voltage switching matrix is at the ms level, the time difference can be approximately ignored, and the acquisition of current and voltage can be approximately considered as synchronous acquisition. The voltage data and current data of each channel obtained by acquisition are input into the control module for calculation to obtain the power data of each channel. The calculation formula for the power data is: In the formula, is the power data, U is the voltage data, is the current data.

[0046] Calculate the difference between the power data of each channel and the preset power threshold to obtain the power difference, and then determine whether the power difference is less than the maximum allowable power error. If it is less, the channel is determined to be qualified. If it is greater than or equal to the maximum allowable power error, the channel is determined to be unqualified, and the channel is calibrated. The specific process of calibration can calibrate the corresponding performance parameters of the simulated battery or electronic load based on the calibration specification of the battery charge and discharge tester, which will not be elaborated in this embodiment.

[0047] It should be noted that the maximum allowable error of electrical parameters includes the maximum allowable error of current and the maximum allowable error of voltage. The values can be referred to the calibration specification of the battery charge and discharge tester. Under different charging modes and measurement ranges, there are corresponding different maximum allowable errors. For example, under constant current charging current, the measurement range is 1 mA~3 kA, the maximum allowable error of current is ±(0.02%~2%), and the maximum allowable error of voltage and other current charging modes will not be elaborated here. The value of the maximum allowable power error can also be referred to the calibration specification of the battery charge and discharge tester. For example, for constant power discharge power, when the measurement range is 1 mW~30 kW, the maximum allowable error is ±(0.05%~5%).

[0048] In the above embodiments, implementation can be achieved entirely or partially through software, hardware, firmware, or any combination thereof. When implemented using software, it can be implemented entirely or partially in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, all or part of the processes or functions described in the embodiments of the present invention are generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, the computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, digital subscriber line) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium can be any available medium that a computer can access or a data storage device such as a server or data center that integrates one or more available media. The available medium can be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., SSD), etc.

[0049] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0050] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the scope of protection of the present invention. In particular, it should be noted that any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention for those skilled in the art.

Claims

1. A calibration device for a battery charge / discharge tester, characterized in that, It includes a control module, and a battery charge / discharge tester, a current switching module, a voltage switching module, and a project switching switch module connected to the control module, wherein... The battery charge and discharge tester includes multiple channel ports. The project switching module includes a project switching control unit, an electronic load and a simulated battery connected to the project switching control unit. The current switching module, the voltage switching module and the project switching control unit each include at least one switching transistor. The current switching module, the voltage switching module, and the project switching control unit are all connected to each of the channel ports of the battery charge and discharge tester; The control module is used to control the closing or opening of the switch tube in the project switching control unit, so that after the electronic load or simulated battery is connected to the battery charge-discharge tester, the control module controls the battery charge-discharge tester to charge the electronic load or receive the current output by the simulated battery. At the same time, the control module controls the current switching module and / or the voltage switching module to collect the current data and / or voltage data of each channel, and based on the collected current data or voltage data of each channel and the corresponding preset electrical parameter values, determines whether each channel needs to be calibrated; and calculates the power of each channel based on the collected current data and voltage data of each channel, and determines whether each channel needs to be calibrated based on the power of each channel and the preset power threshold.

2. The calibration device for a battery charge / discharge tester as described in claim 1, characterized in that, It also includes multiple digital multimeters, wherein the current switching module and the voltage switching module are respectively connected to the corresponding digital multimeters; The digital multimeter is used to collect the current data or voltage data of the channel corresponding to the switching transistor after the current switching module or the voltage switching module closes the switching transistor according to the preset switching method, and to send the collected current data and voltage data to the control module.

3. The calibration device for a battery charge / discharge tester as described in claim 2, characterized in that, Both the current switching module and the voltage switching module include a first preset number of switching units, wherein, The switching unit includes a main switching subunit and a second preset number of auxiliary switching subunits, wherein, The first end of the main switching subunit is directly connected to the digital multimeter, the second end of the main switching subunit is connected to the first end of each of the auxiliary switching subunits, and the second end of each of the auxiliary switching subunits is connected to the corresponding channel port. The second preset number is the ratio of the total number of channel ports of the charge-discharge tester to the first preset number.

4. The calibration device for a battery charge / discharge tester as described in claim 3, characterized in that, The main switching subunit includes a first switching transistor, and the auxiliary switching subunit includes a second switching transistor and a third switching transistor, wherein... The first end of the first switch is connected to the digital multimeter, the second end of the first switch is connected to the first end of the second switch, the second end of the second switch is connected to the first end of the third switch, and the second end of the third switch is connected to the corresponding channel port.

5. The calibration device for a battery charge / discharge tester as described in claim 1, characterized in that, The project switching control unit includes multiple gating switches; The output terminal of the electronic load and the output terminal of the analog battery are respectively connected to the input terminal of each of the gating switches, and the output terminal of each of the gating switches is connected to the corresponding channel port.

6. The calibration device for a battery charge / discharge tester as described in claim 5, characterized in that, The selector switch includes a first position, a second position, and a third position; When the battery charge and discharge tester performs a charging test, the first position of each of the selector switches is closed, so that the electronic load is connected to the battery charge and discharge tester. When the battery charge and discharge tester performs a discharge test, the third position of each of the selector switches is closed to connect the simulated battery to the battery charge and discharge tester. When the battery charge / discharge tester is not performing a test, the second position of each of the selector switches is closed to stop the test.

7. The calibration device for a battery charge / discharge tester as described in claim 1, characterized in that, The preset electrical parameter values ​​include a preset current threshold and a preset voltage threshold, wherein, The preset current threshold is the current value displayed on the screen when the charge / discharge tester charges the electronic load or receives the current output from the simulated battery; The preset voltage threshold is the voltage value displayed on the screen when the charge / discharge tester charges the electronic load or receives the current output from the simulated battery; The preset power threshold is calculated using the current and voltage values ​​displayed on the screen when the charge / discharge tester charges the electronic load or receives current from the simulated battery.

8. A calibration method for a battery charge / discharge tester, characterized in that, A calibration apparatus for a battery charge / discharge tester as described in any one of claims 1 to 7, comprising: In response to the generated charging test command, the control item switching control unit connects the electronic load to the charge / discharge tester; The switching units in the control current switching module or voltage switching module are closed sequentially, and the digital multimeter is controlled to collect the current data or voltage data of each channel. The system receives the current data or voltage data collected by the digital multimeter, calculates the difference between the current data or voltage data of each channel and a preset electrical parameter threshold, and determines whether the difference is less than the maximum permissible error of the electrical parameter. If it is less than the maximum permissible error of the electrical parameter, the channel is deemed qualified; if it is greater than or equal to the maximum permissible error of the electrical parameter, the channel is deemed unqualified, and the channel is calibrated.

9. The calibration method for a battery charge / discharge tester as described in claim 8, characterized in that, Also includes: In response to the generated discharge test command, the project switching control unit controls the connection of the simulated battery to the charge-discharge tester; The switching units in the current switching module or the voltage switching module are controlled to close sequentially, and the digital multimeter is controlled to collect current data or voltage data of each channel. The system receives the current data or voltage data collected by the digital multimeter, calculates the difference between the current data or voltage data of each channel and a preset electrical parameter threshold, and determines whether the difference is less than the maximum permissible error of the electrical parameter. If it is less than the maximum permissible error of the electrical parameter, the channel is deemed qualified; if it is greater than or equal to the maximum permissible error of the electrical parameter, the channel is deemed unqualified, and the channel is calibrated.

10. The calibration method for a battery charge / discharge tester as described in claim 8, characterized in that, Also includes: In response to the generated power test command, the project switching control unit is controlled to connect the simulated battery to the charge / discharge tester; The switching units in the current switching module are closed sequentially, and the digital multimeter is controlled to collect current data from each channel. The switching units in the voltage switching module are controlled to close sequentially, and the digital multimeter is controlled to collect voltage data from each channel. The system receives the current data and voltage data collected by the digital multimeter, and calculates the power of each channel based on the current data and voltage data of each channel. Calculate the difference between the power of each channel and the preset power threshold to obtain the power difference, and determine whether the power difference is less than the maximum permissible power error. If it is less than the maximum permissible power error, the channel is deemed qualified. If it is greater than or equal to the maximum permissible power error, the channel is deemed unqualified and the channel is calibrated.

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