Virtual battery voltage and current calibration device

Abstract

The utility model relates to the technical field, and discloses a virtual battery voltage and current calibration device, which comprises a PC end, a main control board, a channel switching board, a 485 expansion board, a 6019 reference source and a virtual battery cell PACK board, the main control board, the 485 expansion board and the 6019 reference source are all connected to the output end of the PC end, the output end of the 485 expansion board is connected to the input end of the virtual battery cell PACK board, and the output end of the channel switching board is connected to the input end of the virtual battery cell PACK board. The virtual cells can be calibrated at the same time at a time through a PC, real-time calibration in a working environment can be achieved by starting the calibration device when the whole BMS test system runs, compared with traditional single-board calibration, precision errors caused by contact resistance and line resistance generated when a single board is connected into the system are reduced, and the accuracy of the whole BMS test system is improved. The difficulty that the test system needs to be disassembled for secondary calibration when the precision of the single board is abnormal is avoided, the time cost and the labor cost are reduced through one-key calibration, and high-precision calibration and disassembly-free calibration are realized through calibration in the system.

Description

Technical Field

[0001] The utility model relates to the technical field of voltage and current calibration, in particular to voltage and current calibration of a virtual battery, and specifically to a virtual battery voltage and current calibration device. Background Art

[0002] BMS, or battery management system, is rapidly developing in the energy storage industry, and BMS is constantly evolving. This has led to an increasing demand for BMS debugging. To meet this demand, a safe and reliable energy storage system simulation device has been built, with virtual cells being the key to this system. Voltage and current accuracy are key parameters of virtual cells.

[0003] Calibration of the virtual cell's voltage and current is a process that ensures the accuracy of the virtual cell model or simulation system output. Accurate calibration of the virtual cell's voltage and current can be achieved through the correct calibration method, standard calibration equipment, and precise operating procedures.

[0004] Traditional calibration schemes require manual single-cell calibration of virtual batteries, which is time-consuming and labor-intensive. In addition, the calibration accuracy is affected by manual operation, and the calibration environment is inconsistent with the actual operating environment. Therefore, we need to propose a virtual battery voltage and current calibration device to solve the above-mentioned problems. Utility Model Content

[0005] The purpose of the utility model is to provide a virtual battery voltage and current calibration device, which can realize one-time simultaneous calibration of virtual battery cells through a PC, and when the BMS test system is running, real-time calibration can be realized in a working environment by starting the calibration device. Compared with traditional single-board calibration, the accuracy error caused by the contact resistance and line resistance generated when the single board is connected to the system is reduced, and the difficulty of disassembling the test system for secondary calibration when the single board accuracy is abnormal is avoided. The time cost and labor cost are reduced through one-click calibration, and high-precision calibration and disassembly-free calibration are achieved through in-system calibration, so as to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a virtual battery voltage and current calibration device, comprising a PC end, a main control board, a channel switching board, a 485 expansion board, a 6019 reference source and a virtual battery cell PACK board, wherein the main control board, the 485 expansion board and the 6019 reference source are all connected to the output end of the PC end, the output end of the 485 expansion board is connected to the input end of the virtual battery cell PACK board, the output ends of the main control board and the 6019 reference source are both connected to the input end of the channel switching board, and the output end of the channel switching board is connected to the input end of the virtual battery cell PACK board, a plurality of virtual battery cells are installed on the virtual battery cell PACK board, and the output end of the 485 expansion board and the output end of the channel switching board are both connected to a plurality of virtual battery cells.

[0007] Preferably, a 485 communication module is installed inside each of the virtual batteries, and the 485 communication module is electrically connected to the 485 expansion board.

[0008] Preferably, each of the virtual batteries is also equipped with a memory for receiving data sent by the 485 expansion board.

[0009] Preferably, the 485 expansion board is integrated with standard terminals and mini RS485 interfaces for connecting RS485 devices, and the 485 expansion board is provided with a dual-channel data transceiver indicator light for users to monitor the communication status.

[0010] Preferably, the input end of the channel switching board includes a plurality of input channels, and the output end of the channel switching board includes a plurality of output channels, and any one of the input channels can be connected to any one of the output channels.

[0011] Preferably, the 485 expansion board includes a terminal JP1, a chip U1, and a chip U2. Pin 4 of the terminal JP1 is connected to a resistor R1, and pin 6 of the terminal JP1 is connected to a resistor R5. A diode D1 and a diode D3 are connected in series between the resistor R1 and the resistor R5. A diode D2 and a resistor R3 are connected in parallel to the diode D1 and the diode D3.

[0012] Pin 3 of the connection terminal JP1 is connected to a resistor R6, and pin 5 of the connection terminal JP1 is connected to a resistor R11. Diodes D4 and D6 are connected in series between the resistors R6 and R11. A diode D5 and a resistor R8 are connected in parallel to the diodes D4 and D6.

[0013] Preferably, pin 8 of the chip U1 is connected to a grounded capacitor C1 and a resistor R2 connected to one end of the resistor R3, pin 5 of the chip U1 is connected to a resistor R4 connected to the other end of the resistor R3, pin 8 of the chip U2 is connected to a grounded capacitor C2 and a resistor R7 connected to one end of the resistor R8, and pin 5 of the chip U2 is connected to a resistor R10 connected to the other end of the resistor R8.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] The utility model can realize one-time simultaneous calibration of virtual batteries through a PC, and when the BMS test system is running, real-time calibration can be realized in a working environment by starting the calibration device. Compared with traditional single-board calibration, the accuracy error caused by the contact resistance and line resistance generated when the single board is connected to the system is reduced, and the difficulty of disassembling the test system for secondary calibration when the single board accuracy is abnormal is avoided. The time cost and labor cost are reduced through one-key calibration, and high-precision calibration and disassembly-free calibration are achieved through in-system calibration. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a system block diagram of the utility model;

[0017] Figure 2 This is the circuit diagram of the 485 expansion board of this utility model. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0019] See also Figure 1-2 The utility model provides a technical solution: a virtual battery voltage and current calibration device, including a PC end, a main control board, a channel switching board, a 485 expansion board, a 6019 reference source and a virtual battery pack board, the main control board, the 485 expansion board, and the 6019 reference source are all connected to the output end of the PC end, the output end of the 485 expansion board is connected to the input end of the virtual battery pack board, the output ends of the main control board and the 6019 reference source are both connected to the input end of the channel switching board, and the output end of the channel switching board is connected to the input end of the virtual battery pack board, a plurality of virtual batteries are installed on the virtual battery pack board, and the output end of the 485 expansion board and the output end of the channel switching board are both connected to a plurality of virtual batteries.

[0020] The PC side controls the output of the reference voltage and current of the 6019 reference source, and at the same time controls the main control board through the PC side. The main control board then controls the channel switching board to complete the channel switching, and transmits the reference signal generated by the 6019 reference source to the corresponding multiple virtual battery cell positions. The PC side gives the reference signal value to multiple virtual battery cells through the 485 expansion board. Each virtual battery cell then feeds back the actual voltage and current value collected by itself to the PC side based on the obtained reference signal value. The PC side completes the calibration calculation and finally sends the calculated calibration coefficient to each virtual battery cell through the 485 expansion board. It is stored in the virtual battery cell memory (each virtual battery cell corresponds to a memory) to complete the calibration action. This technical solution can realize the simultaneous calibration of multiple virtual batteries at one time through the PC side.

[0021] When the BMS test system is running, real-time calibration can be achieved in the working environment by starting the calibration system. Compared with traditional single-board calibration, it reduces the contact resistance generated when the single board is connected to the system and the accuracy error caused by the line resistance, avoiding the difficulty of disassembling the test system for secondary calibration when the single board accuracy is abnormal.

[0022] A 485 communication module is installed inside each of the virtual batteries, and the 485 communication module is electrically connected to the 485 expansion board.

[0023] The channel switching board supports switching between multiple input and output channels, facilitating user-defined signal selection, conversion, and control. Controlled by a single-chip microcomputer, the board features a variety of configurable dual-channel switching modes, as well as serial conversion between input and output channels, such as RS232 / 485 / 422. It offers fast switching, minimal noise, high transmission efficiency, adjustable delay, and zero data loss, providing users with a completely transparent, full-duplex channel.

[0024] Optionally, the 485 expansion board uses an isolated transceiver module to isolate 485 signals, enhancing the reliability and anti-interference performance of single-channel 485 data transmission. The 485 expansion board features circuit design features for lightning and surge protection, transient voltage shock resistance, and power supply isolation, effectively protecting the main control board.

[0025] Each of the virtual batteries is also equipped with a memory for receiving data sent by the 485 expansion board.

[0026] The 485 expansion board is integrated with standard terminals and mini RS485 interfaces for connecting RS485 devices. The 485 expansion board is provided with a dual-channel data receiving and transmitting indicator light for users to monitor the communication status.

[0027] The 485 communication module is responsible for transmitting data between various components in the virtual battery system, including information such as power level, status, and control instructions. The RS485 communication protocol has the characteristic of long transmission distance, with the maximum communication distance reaching 1,200 meters, meeting the long-distance communication requirements between different devices in the virtual battery system. The use of differential signal transmission technology enhances the anti-interference capability of the 485 communication module, ensuring reliable data transmission in complex electromagnetic environments. It supports multi-node connection and can easily connect devices in multiple virtual battery systems to achieve centralized monitoring and management.

[0028] The input end of the channel switching board includes a plurality of input channels, and the output end of the channel switching board includes a plurality of output channels. Any one of the input channels can be connected to any one of the output channels.

[0029] The 485 expansion board includes a terminal JP1, a chip U1, and a chip U2. Pin 4 of the terminal JP1 is connected to a resistor R1, and pin 6 of the terminal JP1 is connected to a resistor R5. A diode D1 and a diode D3 are connected in series between the resistors R1 and R5. A diode D2 and a resistor R3 are connected in parallel to the diodes D1 and D3.

[0030] Pin 3 of the connection terminal JP1 is connected to a resistor R6, and pin 5 of the connection terminal JP1 is connected to a resistor R11. Diodes D4 and D6 are connected in series between the resistors R6 and R11. A diode D5 and a resistor R8 are connected in parallel to the diodes D4 and D6.

[0031] Pin 8 of the chip U1 is connected to a grounded capacitor C1 and a resistor R2 connected to one end of the resistor R3, pin 5 of the chip U1 is connected to a resistor R4 connected to the other end of the resistor R3, pin 8 of the chip U2 is connected to a grounded capacitor C2 and a resistor R7 connected to one end of the resistor R8, and pin 5 of the chip U2 is connected to a resistor R10 connected to the other end of the resistor R8.

[0032] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A virtual battery voltage and current calibration device, characterized by: It includes a PC end, a main control board, a channel switching board, a 485 expansion board, a 6019 reference source and a virtual battery PACK board. The main control board, 485 expansion board and 6019 reference source are all connected to the output end of the PC end, the output end of the 485 expansion board is connected to the input end of the virtual battery PACK board, the output ends of the main control board and 6019 reference source are both connected to the input end of the channel switching board, and the output end of the channel switching board is connected to the input end of the virtual battery PACK board. Multiple virtual battery cells are installed on the virtual battery PACK board, and the output end of the 485 expansion board and the output end of the channel switching board are both connected to multiple virtual battery cells.

2. The virtual battery voltage and current calibration device according to claim 1, characterized in that: A 485 communication module is installed inside each of the virtual batteries, and the 485 communication module is electrically connected to the 485 expansion board.

3. The virtual battery voltage and current calibration device according to claim 1, characterized in that: Each of the virtual batteries is also equipped with a memory for receiving data sent by the 485 expansion board.

4. The virtual battery voltage and current calibration device according to claim 1, characterized in that: The 485 expansion board is integrated with standard binding posts and a mini RS485 interface for connecting RS485 devices.

5. The virtual battery voltage and current calibration device according to claim 4, characterized in that: The 485 expansion board is provided with a dual-channel data receiving and sending indicator light for users to monitor the communication status.

6. The virtual battery voltage and current calibration device according to claim 1, characterized in that: The input end of the channel switching board includes a plurality of input channels, and the output end of the channel switching board includes a plurality of output channels. Any one of the input channels can be connected to any one of the output channels.

7. The virtual battery voltage and current calibration device according to claim 1, characterized in that: The 485 expansion board includes a terminal JP1 and a chip U1. Pin 4 of the terminal JP1 is connected to a resistor R1. Pin 6 of the terminal JP1 is connected to a resistor R5. Diodes D1 and D3 are connected in series between the resistors R1 and R5. A diode D2 and a resistor R3 are connected in parallel to the diodes D1 and D3.

8. The virtual battery voltage and current calibration device according to claim 7, characterized in that: Pin 3 of the connection terminal JP1 is connected to a resistor R6, and pin 5 of the connection terminal JP1 is connected to a resistor R11. Diodes D4 and D6 are connected in series between the resistors R6 and R11. A diode D5 and a resistor R8 are connected in parallel to the diodes D4 and D6.

9. The virtual battery voltage and current calibration device according to claim 8, characterized in that: Pin 8 of the chip U1 is connected to a grounded capacitor C1 and a resistor R2 connected to one end of the resistor R3 , and pin 5 of the chip U1 is connected to a resistor R4 connected to the other end of the resistor R3 .

10. The virtual battery voltage and current calibration device according to claim 9, characterized in that: The 485 expansion board includes a chip U2; pin 8 of the chip U2 is connected to a grounded capacitor C2 and a resistor R7 connected to one end of the resistor R8, and pin 5 of the chip U2 is connected to a resistor R10 connected to the other end of the resistor R8.

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