Multi-channel charging and discharging power supply equipment calibration system and method

Abstract

The present invention relates to a multi-channel charging and discharging power supply equipment calibration system and method. The multi-channel charging and discharging power supply equipment calibration system comprises: a host computer, a main control unit, a power conversion unit connected to the main control unit, a positive pole matrix channel unit and a negative pole matrix channel unit connected to the power conversion unit, and a voltage and current measuring instrument input and output by the power conversion unit; there are communication interfaces between the main control unit and the host computer, the multi-channel charging and discharging power supply equipment, the voltage measuring instrument, and the current measuring instrument, respectively, and there are control interfaces between the main control unit and the positive pole matrix channel unit and the negative pole matrix channel unit respectively; there are power supply interfaces between the power conversion unit and the main control unit, the positive pole matrix channel unit, and the negative pole matrix channel unit respectively; the present invention adopts a matrix multiplexing method in design, which can perform calibration and measurement work of multiple different channels, can greatly improve work efficiency, and can greatly save test time and test costs.

Description

Technical field:

[0001] The present invention relates to the technical field of lithium ion battery production and manufacturing, and in particular to a multi-channel charging and discharging power supply equipment correction system and method. Background technology:

[0002] During the production and manufacturing of batteries, due to process requirements, the batteries need to be charged and discharged in multiple links. The various parameters of the batteries will be differentiated during the charging and discharging process, and then the battery can be sorted and the process can be identified. The charging and discharging of the battery is carried out through the power supply equipment. As the main equipment for charging and discharging the battery, the power supply equipment needs to realize the constant voltage and constant current charging and discharging of the battery. The equipment has high precision and is crucial to battery production and manufacturing. Therefore, it is necessary to ensure that its operation is stable and meets a certain parameter range during use. Therefore, the power supply equipment for battery charging and discharging needs to be calibrated according to the production cycle to ensure the accuracy of the power supply equipment in charging and discharging the battery.

[0003] However, in the production and testing of batteries, the battery itself is not charged and discharged individually. Often, during the production process, many batteries are placed in a tray for production, testing, circulation and other operations. Therefore, in the current production of various types of batteries, the tray carries a few or dozens of batteries, and as many as hundreds of batteries. Therefore, the matching charging and discharging power supply equipment are also multi-channel equipment. Therefore, for this kind of multi-channel power supply equipment, it is also necessary to conduct a comprehensive calibration. The traditional calibration method is often to manually calibrate the channels of the power supply equipment one by one, which has low work efficiency and the calibration is prone to introduce secondary errors. Summary of the invention:

[0004] The present invention provides a method for realizing the calibration of multiple channels of a power supply by using an automated matrix scanning method, which can automatically realize the calibration of multiple processes. The specific technical scheme is as follows:

[0005] A multi-channel charging and discharging power supply equipment calibration system, comprising: a host computer, a main control unit, a power conversion unit connected to the main control unit, a positive electrode matrix channel unit and a negative electrode matrix channel unit connected to the power conversion unit, and a voltage measuring instrument and a current measuring instrument for input and output of the power conversion unit;

[0006] There are communication interfaces between the main control unit and the host computer, the multi-channel charging and discharging power supply device, the voltage measuring instrument, and the current measuring instrument, and there are control interfaces between the main control unit and the positive electrode matrix channel unit and the negative electrode matrix channel unit;

[0007] There are power interfaces between the power conversion unit and the main control unit, the positive matrix channel unit, and the negative matrix channel unit respectively;

[0008] The accuracy of the voltage measuring instrument and the current measuring instrument is higher than the measurement accuracy of the voltage and current of the multi-channel charging and discharging power supply device itself;

[0009] The positive electrode matrix channel unit and the negative electrode matrix channel unit are both designed as M*N channel circuits, and the arrangement of the positive and negative electrodes of the simulated battery is realized through the contact sheet. The power conversion unit, the main control unit, the related logic circuit, and the instrument are arranged between the positive and negative electrode matrix channel units, which are designed to be a standard M*N battery tray size specification, placed on the battery charging and discharging power supply equipment, and the corresponding power multi-channels are calibrated and measured through the host computer instructions;

[0010] The power conversion unit is responsible for the power supply of the system and the simulation of various battery parameters, and can realize any one of the four simulation mode switching of calibration of small charging voltage, calibration of large charging voltage, calibration of large charging current, and calibration of large discharging current; the main control unit realizes the control of the instrument, the realization of measurement logic, the communication between the host computer and the calibrated power supply equipment, the voltage measuring instrument and the current measuring instrument realize the accurate measurement of voltage and current data, and the positive matrix channel unit and the negative matrix channel unit are responsible for realizing the switching of different positive and negative power supply channels.

[0011] The multi-channel charging and discharging power supply device calibration method implemented on the above system includes the following process:

[0012] Step 1: The host computer issues a work instruction to the power supply device and the main control unit for battery charging and discharging, wherein the instruction is limited to any one of the four instructions of calibration of charging small voltage, calibration of charging large voltage, calibration of charging large current, and calibration of discharging large current;

[0013] Step 2: The main control unit controls the corresponding channel to open, and provides a simulation of the instruction request mode through the power conversion unit;

[0014] Step 3: After the current is measured by the internal voltage measuring instrument and current measuring instrument, the measured value is recorded and then compared with the voltage and current data monitored by the power supply equipment used for battery charging and discharging;

[0015] Step 4: After calculating the difference between the data, if the calibration error is within the specified range, the calibration is passed; if the calibration difference does not meet the accuracy requirements, the power supply equipment used for battery charging and discharging performs calibration interpolation; then return to step 1 and perform calibration test again;

[0016] Step 5: After two rounds of the above test measurements, if the calibration error is within the specified range, the calibration is passed; if the calibration difference is still large, feedback is given that the calibration has failed and there is an abnormality in the calibration test of this channel;

[0017] Step 6: For other channels, repeat steps 1 to 5 until all battery channels of the entire tray have been calibrated.

[0018] Preferred solution one, the main control unit includes: a main control unit circuit, a communication interface circuit, and a logic relationship circuit; wherein the main control unit circuit serves as the core of the entire system and controls the operation of the entire correction tooling; the communication interface circuit serves as an interface for interacting with external information, and mainly includes an Ethernet communication module, an RS485 communication module, a USB communication module, and a CAN communication module; the Ethernet communication interface is used to communicate with instruments and meters, the RS485 communication module is used to communicate with a host computer and a charging and discharging power supply box, the USB communication module is used for system debugging and data storage, and the CAN communication module is a backup reserved communication.

[0019] Preferred solution 2, the power conversion unit includes:

[0020] The AC / DC conversion module converts 220 volts of alternating current into 24 volts of direct current, and the output end is divided into three paths, namely the first output end, the second output end, and the third output end;

[0021] The DC / DC conversion system power supply module connected to the first output terminal can output a voltage of 5 volts to provide power for the main control unit circuit;

[0022] The DC / DC conversion channel logic power supply module connected to the second output terminal converts 24V DC into 12V DC. The output terminal is connected to the matrix channel logic interface and is mainly used to drive the power MOS tube to turn on.

[0023] The DC / DC conversion simulation battery discharge module connected to the third output terminal converts 24 volts of direct current into 5 volts of direct current, and the output terminal is connected to the matrix channel power interface; the simulated battery system discharges and is used to provide power to the power supply equipment for battery charging and discharging. The rated output voltage is 5V, and the rated output current must be no less than 6A.

[0024] Preferred solution three, the positive electrode matrix channel unit is a TOP top-layer circuit board, and the positive electrode is turned on and off by driving the power MOS tube; the negative electrode matrix channel unit is a BOT bottom-layer circuit board, and the negative electrode is turned on and off by driving the power MOS tube; the conduction of the positive and negative electrodes is carried out synchronously.

[0025] The characteristics of the present invention relative to the prior art are as follows:

[0026] (a) The present invention can realize automated calibration and metering work. Its design simulates the entire tray battery. According to the different types of batteries, it is designed in the form of different types of battery trays. It can adapt well to the factory production automation line and carry out various tasks such as circulation, testing, and stacking in the automation line. Therefore, combined with the factory's automation device, it can achieve a good level of automation, which greatly facilitates the testing and calibration of battery charging and discharging equipment.

[0027] (II) The present invention can realize multi-channel calibration and measurement work. Its design adopts a matrix multiplexing method, for example, a 16*16 row and column control method can realize calibration and measurement work of 256 different channels. Therefore, this method can greatly improve work efficiency, realize multi-channel calibration work, and greatly save test time and test cost.

[0028] (III) The present invention can realize a variety of power supply calibration processes according to various battery standards or battery type requirements, such as pre-charging of battery processes, formation and capacity division of battery processes. In terms of specific implementation, it can complete large current constant current charging test calibration, large current constant current discharge test calibration, test calibration of standard charging voltage at each stage, etc. Description of the drawings:

[0029] Figure 1 It is a structural schematic diagram of a multi-channel charging and discharging power supply equipment correction system of the present invention.

[0030] Figure 2 It is a schematic diagram of the structure of the power conversion unit of the present invention.

[0031] Figure 3 Schematic diagram of the structure of a control unit in an embodiment of the present invention.

[0032] Figure 4 Schematic diagram of the contact point structure of the positive and negative electrode matrix channel unit matrix of the device in an embodiment of the present invention.

[0033] Figure 5 It is a schematic diagram of the structure of the positive and negative electrode matrix channel units of the device in an embodiment of the present invention.

[0034] Figure 6 yes Figure 5 The circuit schematic diagram; the positive electrode matrix unit is designed as the TOP top circuit board, and the negative electrode matrix unit is designed as the BOT bottom circuit board, only the related poles representing the positive and negative electrodes are different; its working principle is to realize the conduction and shutdown of the positive and negative electrodes by driving the power MOS tube; for the same battery channel, the conduction of the positive and negative electrodes is carried out synchronously, that is, the same battery channel is controlled simultaneously.

[0035] Figure 7It is the logic control interface circuit of the positive and negative matrix units and the main control unit in the embodiment of the present invention; the interfaces of the positive and negative matrix units are consistent, and the difference is only that they are connected to different interfaces of the control unit, so only one of them is described, which mainly includes 16 groups of X-axis control, 16 groups of Y-axis control, 12V gate circuit driving power supply POWER2 and power supply POWER3 interface for the main power supply channel; the control of X and Y just forms a matrix control design, 16-way X control circuit, 16-way Y control circuit, to achieve the control of 16*16 256-way battery channels, for example, when you want to control the first channel, you need to enable X1, and disable other X controls, enable Y1, and enable other Y controls, so that the first channel can be controlled alone, and the other channels are similar.

[0036] Figure 8 1 is a schematic diagram of the interface on one side of the main control unit in the embodiment of the present invention; wherein the TOP interface is used to connect the positive electrode matrix unit, the BOT interface is used to connect the negative electrode matrix unit, the X interface is used to connect the X control of the matrix unit, and the Y interface is used to connect the Y control of the matrix unit. Since the control of one channel requires the positive and negative channels to be linked to each other, the X control of the TOP interface and the X control of the BOT interface are connected together, and the Y control of the TOP interface and the Y control of the BOT interface are connected together to complete the control of 256 channels of the entire correction device system; wherein the TOP interface and the BOT interface of the 12V gate circuit driving power supply POWER2 are connected together, that is, the positive and negative electrodes. In the following description, TOP represents the positive electrode of the tooling simulation battery, and BOT represents the negative electrode of the tooling simulation battery; TOP-POWER3 of the TOP interface is used for the positive electrode of the main power channel, and BOT-POWER3 is used for the negative electrode of the main power channel. Here, it is connected to POWER-NEGATIVE and connected to the measurement interface of the control unit.

[0037] Fig. 9 It is a schematic diagram of the AC / DC conversion module of the power conversion unit in the embodiment of the present invention; its main function is to convert alternating current into a 24V direct current power supply, and its required rated power is above 100W.

[0038] Fig.10 It is a schematic diagram of a gate circuit control power supply circuit in an embodiment of the present invention; the gate circuit control power supply is mainly used to drive the power MOS tube to turn on, and its power supply is designed to be DC 12V.

[0039] Fig.11 It is a schematic diagram of the matrix channel power supply circuit in an embodiment of the present invention; it is mainly used to calibrate the tooling simulation battery system for discharge, and is used to provide power to the power supply equipment for battery charging and discharging. Taking 18650 battery as an example, its rated output voltage is 5V, and the rated output current requirement must be no less than 6A.

[0040] Fig.12 It is a schematic diagram of the VCC5V power supply circuit of the main control unit in an embodiment of the present invention; VCC5V is used to provide a low-voltage DC power supply to the entire control system and to provide power for TTL devices.

[0041] Fig.13 It is a schematic diagram of the VCC3.3V power supply circuit of the main control unit in an embodiment of the present invention; VCC3.3V is used to provide power to the entire control system controller and to COMS devices.

[0042] Fig.14 It is a schematic diagram of the VCC1.8V power supply circuit of the main control unit in an embodiment of the present invention; VCC1.8V is used to provide power to the PHY device.

[0043] Fig.15 It is a schematic diagram of the circuit of the main control unit in an embodiment of the present invention; wherein the communication interface circuit serves as an interface for interacting with external information, and mainly includes a variety of circuit communication interfaces, such as an Ethernet communication interface for communicating with instruments and meters, RS485 communication for communicating with a host computer and a charging and discharging power box, USB communication for system debugging and data storage, and CAN communication as a backup reserved communication.

[0044] Fig.16 It is a PHY functional principle diagram of Ethernet communication of the main control unit in the embodiment of the present invention, which mainly implements standard TCP / IP Ethernet communication and is used for data communication with instruments in the embodiment of the present invention.

[0045] Fig.17 It is a functional schematic diagram of the corresponding peripheral circuits of the PHY of the Ethernet communication of the main control unit in the embodiment of the present invention; it includes a mode selection circuit for controlling the selection of the PHY Ethernet working mode, an isolated power supply and filtering circuit of the corresponding power supply, and a standard RJ45 Ethernet interface.

[0046] Fig.18 It is a functional principle diagram of RS485 communication of the main control unit in an embodiment of the present invention; this embodiment includes two standard RS485 communications, one for communicating with the host computer PC, and the other for communicating with the power supply equipment for charging and discharging.

[0047] Fig.19 It is a functional principle diagram of USB communication of the main control unit in an embodiment of the present invention; it is mainly used for external debugging and local storage interface of data.

[0048] Fig. 20 It is a functional principle diagram of CAN communication of the main control unit in an embodiment of the present invention; it is mainly used as a backup communication interface of the device, and is used to access a test fixture or other extended external devices.

[0049] Fig.21 1 is a schematic diagram of the IO expansion function in an embodiment of the present invention; it mainly realizes multi-channel control by expanding the IO port and using fewer IOs to realize the control of matrix X and Y.

[0050] Fig. 22 It is a schematic diagram of the IO conversion function in an embodiment of the present invention; the level conversion part of the IO control port needs to perform bidirectional level conversion through a buffer because there are differences in the levels between the control logics, that is, the conversion from CMOS to TTL, and has a protective isolation function to protect the main control system; among them, IOCTL1-IOCTL16 is used to realize the matrix X control of TOP and BOT (i.e. positive and negative electrodes) (positive and negative electrodes are linked, and TOP and BOT are finally connected together).

[0051] Fig.23 It is a schematic diagram of the IO conversion function in an embodiment of the present invention; the level conversion part of the IO control port needs to perform bidirectional level conversion through a buffer because there are differences in the levels between the control logics, that is, the conversion from CMOS to TTL, and has a protective isolation function to protect the main control system; among them, IOCTL17-IOCTL32 is used to realize the matrix Y control of TOP and BOT (i.e. positive and negative poles), which will be connected to the logic gate circuit of Y control to realize the next level of control.

[0052] Fig.24 It is a schematic diagram of the gate switch control function in an embodiment of the present invention; it is mainly used to realize effective logical control of Y in the positive and negative pole matrix and realize the conduction of the return path. The main function of the relay function switching part is that for different functional relationships, it is necessary to realize the functions of simulating high-current charging, high-current discharging, low-voltage charging and high-voltage charging of the battery.

[0053] Fig.25 It is a functional switching control function schematic diagram in an embodiment of the present invention; wherein RE1 is used to switch whether the device simulates battery charging or battery discharging, RE2 is used to switch whether the device simulates high-current battery charging or high-current discharge using a channel, and RE3 is used to switch whether the device simulates battery current or charging voltage channels.

[0054] Fig.26 It is a functional schematic diagram of the sampling circuit in the embodiment of the present invention; wherein, the circuit of sampling 1 is used to simulate the power supply device charging the battery with a large current, where the current is sampled and the charging energy loss is measured by a load device; wherein the circuit of sampling 2 is used to simulate the discharge process of the battery with a large current, the power supply is taken from the main DC / DC power supply module, current sampling is performed here, and the accurate discharge current is determined by measuring with an instrument.

[0055] Fig. 27 It is a functional schematic diagram of the instrument access in the embodiment of the present invention; it mainly includes the TCP / IP Ethernet communication of the main control unit, the measurement of the sampling circuit for two sampling currents and the measurement of small voltage and large voltage charging. Specific implementation method:

[0056] Example:

[0057] This embodiment uses positive and negative pole matrix channel units to simulate multiple batteries in a tray, and implements channel logic control, data sampling, instrument measurement and calibration. The specific implementation method is: the positive and negative pole matrix channel units are designed as 16*16 channel circuits, and the arrangement of the positive and negative poles of the simulated battery is realized through contact sheets, and the power conversion unit, control unit and related logic circuits, instruments and meters are arranged between the positive and negative pole matrix channel units, and it is designed to be a standard 256 battery (such as 18650 battery) tray size specification, and it is placed under the battery charging and discharging power supply system through automated loading and unloading or stacking equipment, and the corresponding power multi-channel is calibrated and measured through the host computer instruction. The calibration and measurement method is determined according to the relevant process requirements in the battery production process. The calibration process of the power multi-channel device for the 18650 battery capacity division part is given as follows, which includes the calibration calibration of the 100mV charging small voltage, the calibration calibration of the 4500mV charging large voltage, the calibration calibration of the 5000mA charging current, and the calibration calibration of the 5000mV discharge current. The correction method is flexible and operable according to the actual needs such as battery type and process steps.

[0058] A multi-channel charging and discharging power supply equipment calibration system, comprising: a host computer, a main control unit, a power conversion unit connected to the main control unit, a positive electrode matrix channel unit and a negative electrode matrix channel unit connected to the power conversion unit, and a voltage measuring instrument and a current measuring instrument for input and output of the power conversion unit;

[0059] There are communication interfaces between the main control unit and the host computer, the multi-channel charging and discharging power supply device, the voltage measuring instrument, and the current measuring instrument, and there are control interfaces between the main control unit and the positive electrode matrix channel unit and the negative electrode matrix channel unit;

[0060] There are power interfaces between the power conversion unit and the main control unit, the positive matrix channel unit, and the negative matrix channel unit respectively;

[0061] The accuracy of the voltage measuring instrument and the current measuring instrument is higher than the measurement accuracy of the voltage and current of the multi-channel charging and discharging power supply device itself;

[0062] The positive electrode matrix channel unit and the negative electrode matrix channel unit are both designed as M*N channel circuits, and the arrangement of the positive and negative electrodes of the simulated battery is realized through the contact sheet. The power conversion unit, the main control unit, the related logic circuit, and the instrument are arranged between the positive and negative electrode matrix channel units, which are designed to be a standard 16*16 battery tray size specification, placed on the battery charging and discharging power supply equipment, and the corresponding power multi-channels are calibrated and measured through the host computer instructions;

[0063] The power conversion unit is responsible for the power supply of the system and the simulation of various battery parameters, and can realize any one of the four simulation mode switching of calibration of small charging voltage, calibration of large charging voltage, calibration of large charging current, and calibration of large discharging current; the main control unit realizes the control of the instrument, the realization of measurement logic, the communication between the host computer and the calibrated power supply equipment, the voltage measuring instrument and the current measuring instrument realize the accurate measurement of voltage and current data, and the positive matrix channel unit and the negative matrix channel unit are responsible for realizing the switching of different positive and negative power supply channels.

[0064] Digital power supply is required, including VCC5V, VCC3.3V, and VCC1.8V, of which VCC5V is used to provide low-voltage DC power to the entire control system and power to TTL devices;

[0065] The main control unit includes: a main control unit circuit, a communication interface circuit, and a logic relationship circuit; wherein the main control unit circuit serves as the core of the entire system and controls the work of the entire calibration tooling; the communication interface circuit serves as an interface for interacting with external information and mainly includes an Ethernet communication module, an RS485 communication module, a USB communication module, and a CAN communication module; the Ethernet communication interface is used to communicate with instruments and meters; the RS485 communication module is used to communicate with a host computer and a charging and discharging power supply box; the USB communication module is used for system debugging and data storage; and the CAN communication module is a standby reserved communication;

[0066] The power conversion unit includes: an AC / DC conversion module, which converts 220 volts of alternating current into 24 volts of direct current, and the output end is divided into three paths, namely, a first output end, a second output end, and a third output end; a DC / DC conversion system power supply module connected to the first output end, which can output a voltage of 5 volts to provide power for the main control unit circuit; a DC / DC conversion channel logic power supply module connected to the second output end, which converts 24 volts of direct current into 12 volts of direct current, and the output end is connected to the matrix channel logic interface, and is mainly used to drive the power MOS tube to turn on; a DC / DC conversion simulation battery discharge module connected to the third output end, which converts 24 volts of direct current into 5 volts of direct current, and the output end is connected to the matrix channel power supply interface; the simulated battery system discharges, and is used to provide power to the power supply equipment for battery charging and discharging, and its rated output voltage is 5V, and the rated output current requirement must be not less than 6A;

[0067] The positive electrode matrix channel unit is a TOP top-layer circuit board, which realizes the conduction and shutdown of the positive electrode by driving the power MOS tube; the negative electrode matrix channel unit is a BOT bottom-layer circuit board, which realizes the conduction and shutdown of the negative electrode by driving the power MOS tube; the conduction of the positive and negative electrodes is carried out synchronously.

[0068] The calibration method for the small charging voltage of the multi-channel charging and discharging power supply device implemented on the above system is as follows:

[0069] Step 101: The host computer sends a "calibration of charging low voltage" instruction to the power supply device and the main control unit for battery charging and discharging;

[0070] Step 102: The main control unit controls the corresponding channel to open, and provides a simulation of the instruction request mode through the power conversion unit;

[0071] Step 103: After the internal voltage measuring instrument measures, the measured value is recorded, and then compared with the voltage data monitored by the power supply equipment used for battery charging and discharging;

[0072] Step 104: After calculating the difference between the data, if the calibration error is within the specified range, the calibration is passed; if the calibration difference does not meet the requirements within the accuracy range, the power supply equipment for battery charging and discharging performs calibration interpolation; then return to step 1 to perform calibration test again;

[0073] Step 105: After two rounds of the above test measurements are performed again, if the calibration error is within the specified range, the calibration is passed; if the calibration difference is still large, feedback is given that the calibration has failed and the calibration test of this channel is abnormal;

[0074] Step 106: For other channels, repeat steps 1 to 5 until the calibration of the low-voltage charging process of the 256 battery channels of the entire tray is completed.

[0075] The calibration method for the large charging voltage of the multi-channel charging and discharging power supply device implemented on the above system is as follows:

[0076] Step 201: The host computer sends a "charging high voltage calibration" instruction to the power supply device and the main control unit for battery charging and discharging;

[0077] Step 202: The main control unit controls the corresponding channel to open, and provides a simulation of the instruction request mode through the power conversion unit;

[0078] Step 203: After the internal voltage measuring instrument measures, the measured value is recorded, and then compared with the voltage data monitored by the power supply equipment used for battery charging and discharging;

[0079] Step 204: After calculating the difference between the data, if the correction error is within the specified range, the correction is passed; if the correction difference does not meet the requirements within the accuracy range, the power supply equipment for battery charging and discharging performs correction interpolation; then return to step 1 to perform calibration test again;

[0080] Step 205: After two rounds of the above test measurements are performed again, if the calibration error is within the specified range, the calibration is passed; if the calibration difference is still large, feedback is given that the calibration has failed and there is an abnormality in the calibration test of this channel;

[0081] Step 206: For other channels, repeat steps 1 to 5 until the calibration of the high-voltage charging process of the 256 battery channels of the entire tray is completed.

[0082] The calibration method for the large charging current of the multi-channel charging and discharging power supply device implemented on the above system is as follows:

[0083] Step 301: The host computer sends a "calibration of large charging current" instruction to the power supply device and the main control unit for battery charging and discharging;

[0084] Step 302: The main control unit controls the corresponding channel to open, and provides a simulation of the instruction request mode through the power conversion unit;

[0085] Step 303: After the internal current measuring instrument measures, the measured value is recorded, and then compared with the current data monitored by the power supply device used for battery charging and discharging;

[0086] Step 304: After calculating the difference between the data, if the correction error is within the specified range, the correction is passed; if the correction difference does not meet the requirements within the accuracy range, the power supply equipment for battery charging and discharging performs correction interpolation; then return to step 1 to perform calibration test again;

[0087] Step 305: After two rounds of the above test measurements are performed again, if the calibration error is within the specified range, the calibration is passed; if the calibration difference is still large, feedback is given that the calibration has failed and there is an abnormality in the calibration test of this channel;

[0088] Step 306: For other channels, repeat steps 1 to 5 until the calibration of the high current charging process of the 256 battery channels of the entire tray is completed.

[0089] The calibration method for the large discharge current of the multi-channel charging and discharging power supply device implemented on the above system is as follows:

[0090] Step 401: The host computer sends a "discharge large current calibration" instruction to the power supply device and the main control unit for battery charging and discharging;

[0091] Step 402: The main control unit controls the corresponding channel to open, and provides a discharge current through the power conversion unit;

[0092] Step 403: After the internal current measuring instrument measures, the measured value is recorded, and then compared with the current data monitored by the power supply device used for charging and discharging the battery;

[0093] Step 404: After calculating the difference between the data, if the correction error is within the specified range, the correction is passed; if the correction difference does not meet the requirements within the accuracy range, the power supply equipment for battery charging and discharging performs correction interpolation; then return to step 1 to perform calibration test again;

[0094] Step 405: After two rounds of the above test measurements are performed again, if the calibration error is within the specified range, the calibration is passed; if the calibration difference is still large, feedback is given that the calibration has failed and there is an abnormality in the calibration test of this channel;

[0095] Step 406: For other channels, repeat steps 1 to 5 until the discharge current process calibration of the 256 battery channels of the entire tray is completed.

Claims

1. A multi-channel charging and discharging power supply equipment calibration system, characterized in that: include: Host computer, main control unit, power conversion unit connected to the main control unit, positive matrix channel unit and negative matrix channel unit connected to the power conversion unit, voltage measuring instrument and current measuring instrument for input and output of the power conversion unit; There are communication interfaces between the main control unit and the host computer, the multi-channel charging and discharging power supply device, the voltage measuring instrument, and the current measuring instrument, and there are control interfaces between the main control unit and the positive electrode matrix channel unit and the negative electrode matrix channel unit; There are power interfaces between the power conversion unit and the main control unit, the positive matrix channel unit, and the negative matrix channel unit respectively; The accuracy of the voltage measuring instrument and the current measuring instrument is higher than the measurement accuracy of the voltage and current of the multi-channel charging and discharging power supply device itself; The positive electrode matrix channel unit and the negative electrode matrix channel unit are both designed as M*N channel circuits, and the arrangement of the positive and negative electrodes of the simulated battery is realized through the contact sheet. The power conversion unit, the main control unit, the related logic circuit, and the instrument are arranged between the positive and negative electrode matrix channel units, which are designed to be a standard M*N battery tray size specification, placed on the battery charging and discharging power supply equipment, and the corresponding power multi-channels are calibrated and measured through the host computer instructions; The power conversion unit is responsible for the power supply of the system and the simulation of various battery parameters, and realizes the calibration of the small charging voltage, the calibration of the large charging voltage, the calibration of the large charging current, and the calibration of the large discharging current. The main control unit realizes the control of the instrument, the realization of the measurement logic, the communication between the host computer and the calibrated power supply equipment, the voltage measuring instrument and the current measuring instrument realize the accurate measurement of the voltage and current data, and the positive matrix channel unit and the negative matrix channel unit are responsible for realizing the switching of different positive and negative power supply channels; the power conversion unit includes: The AC / DC conversion module converts 220 volts of alternating current into 24 volts of direct current, and the output end is divided into three paths, namely the first output end, the second output end, and the third output end; The DC / DC conversion system power supply module connected to the first output terminal outputs a voltage of 5 volts to provide power to the main control unit circuit; The DC / DC conversion channel logic power supply module connected to the second output terminal converts 24V DC into 12V DC. The output terminal is connected to the matrix channel logic interface and is mainly used to drive the power MOS tube to turn on. The DC / DC conversion simulation battery discharge module connected to the third output terminal converts 24 volts of direct current into 5 volts of direct current, and the output terminal is connected to the matrix channel power interface; the simulated battery system discharges and is used to provide power to the power supply equipment for battery charging and discharging. The rated output voltage is 5V, and the rated output current must be no less than 6A.

2. The multi-channel charging and discharging power supply equipment calibration system according to claim 1, characterized in that: The main control unit includes: a main control unit circuit, a communication interface circuit, and a logic relationship circuit; wherein the main control unit circuit serves as the core of the entire system and controls the operation of the entire calibration tooling; the communication interface circuit serves as an interface for interacting with external information and mainly includes an Ethernet communication module, an RS485 communication module, a USB communication module, and a CAN communication module; the Ethernet communication interface is used for communicating with instruments and meters; the RS485 communication module is used for communicating with a host computer and a charging and discharging power supply box; the USB communication module is used for system debugging and data storage; and the CAN communication module is a standby reserved communication.

3. The multi-channel charging and discharging power supply equipment calibration system according to claim 1, characterized in that: The positive electrode matrix channel unit is a TOP top-layer circuit board, which realizes the conduction and shutdown of the positive electrode by driving the power MOS tube; the negative electrode matrix channel unit is a BOT bottom-layer circuit board, which realizes the conduction and shutdown of the negative electrode by driving the power MOS tube; the conduction of the positive and negative electrodes is carried out synchronously.

4. The multi-channel charge-discharge power supply device calibration method implemented on the multi-channel charge-discharge power supply device calibration system of claim 1, characterized in that: The process includes the following: Step 1: The host computer issues a work instruction to the power supply device and the main control unit for battery charging and discharging, wherein the instruction is limited to any one of the four instructions of calibration of charging small voltage, calibration of charging large voltage, calibration of charging large current, and calibration of discharging large current; Step 2: The main control unit controls the corresponding channel to open, and provides a simulation of the instruction request mode through the power conversion unit; Step 3: After the current is measured by the internal voltage measuring instrument and current measuring instrument, the measured value is recorded and then compared with the voltage and current data monitored by the power supply equipment used for battery charging and discharging; Step 4: After calculating the difference between the data, if the calibration error is within the specified range, the calibration is passed; if the calibration difference does not meet the accuracy requirements, the power supply equipment used for battery charging and discharging performs calibration interpolation; then return to step 1 and perform calibration test again; Step 5: After two rounds of test measurements between steps 1 to 4, if the calibration error is within the specified range, the calibration is passed; if the calibration difference is still large, feedback is given that the calibration has failed and there is an abnormality in the calibration test of this channel; Step 6: For other channels, repeat steps 1 to 5 until all battery channels of the entire tray have been calibrated.

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