High-precision SOC detection device for all-vanadium redox flow battery

Abstract

The utility model relates to a high-precision SOC detection device for an all-vanadium redox flow battery. The high-precision SOC detection device comprises an acquisition module, an isolation module, a single-chip microcomputer module and a communication module, the output end of the acquisition module is connected with the input end of the isolation module; the output end of the isolation module is connected with the input end of the single-chip microcomputer module. The output end of the single-chip microcomputer module is connected with the input end of the communication module. By adopting a high-precision ADC chip and an isolation design, the voltage measurement precision and the anti-interference capability of the system are improved, and SOC data can be accurately acquired in a complex environment. The device supports a user-defined SOC calculation equation, flexibly adapts to different battery characteristics, and meets diversified application requirements. SOC data is output through an RS485 interface, remote monitoring and data interaction are achieved, system integration is simplified, the system is suitable for the fields of new energy storage, electric power peak regulation and the like, and the reliability and management efficiency of the system are improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to all vanadium flow battery SOC detection device is widely used in new energy energy storage, power peak shaving, microgrid and renewable energy power generation etc. field, relate to a kind of all vanadium flow battery high-precision SOC detection device. BACKGROUND

[0002] In prior art, the SOC detection of all vanadium flow battery can only be measured by open-circuit voltage (OCV), and the accurate SOC result cannot be directly obtained. Usually, the measured OCV value is only a parameter of battery state, and cannot directly provide the required SOC data. In order to obtain SOC, OCV data needs to be transmitted to PLC (programmable logic controller) or other external processors, and then the SOC value is derived through complex calculation and algorithm.

[0003] This method has significant disadvantages. First, additional calculation steps are required after measuring OCV, which results in that the entire SOC detection process cannot be completed in real time and there is a certain delay. Secondly, the relationship between OCV and SOC is affected by factors such as temperature, historical charging and discharging state, which makes the operation on PLC may produce error, and cannot accurately reflect the real state of charge of the battery. In addition, this technology relies on external control system for calculation, which increases the complexity and cost of the system. Therefore, the existing technology can only measure OCV voltage, and cannot directly obtain SOC result, which is low in efficiency and limited in accuracy. UTILITY MODEL CONTENT

[0004] In order to solve the above problems, the utility model adopts the technical scheme: a kind of all vanadium flow battery high-precision SOC detection device, comprising: acquisition module, isolation module, single-chip microcomputer module and communication module;

[0005] The output end of the acquisition module is connected with the input end of the isolation module;

[0006] The output end of the isolation module is connected with the input end of the single-chip microcomputer module;

[0007] The output end of the single-chip microcomputer module is connected with the input end of the communication module.

[0008] Further, the model of the acquisition module is ADS1115 chip.

[0009] Furthermore: the 4th pin AIN0 of the ADS1115 chip is connected to an open-circuit voltage signal, the 1st pin ADDR and the 3rd pin GND of the ADS1115 are grounded, the 8th pin VDD of the ADS1115 chip is grounded in parallel with capacitor C1, the 9th pin SDA of the ADS1115 chip is connected to VDD through a 4.7K pull-up resistor, and the 10th pin SCL of the ADS1115 chip is connected to VDD through a 4.7K pull-up resistor.

[0010] Furthermore, the isolation module uses the ISO1541D chip.

[0011] Furthermore: Pin 1 VCC1 of the ISO1541D chip is connected to VDD_MCU, Pin 2 SDA1 and Pin 3 SCL1 are connected to VDD_MCU through 4.7K resistors respectively, Pin 4 GND1 is connected to GND_MCU, Pin 5 GND2 is connected to GND, Pin 6 SCL2 is connected to the SCL pin of ADS1115, Pin 7 SDA is connected to the SDA pin of ADS1115, and Pin 8 VCC2 is connected to ground in parallel with capacitor C1.

[0012] Furthermore, the microcontroller module uses an STM32F103VET6 chip.

[0013] Furthermore: Pin 38 (VCC) of the STM32F103VET6 is connected to VCC_MCU; Pin 29 (P4.6) is connected to VCC_MCU with a 4.7K resistor; Pin 4 (RST) is connected to GND with a 10K resistor; Pin 14 (XTAL2) and Pin 15 (XTAL1) are connected to an external crystal oscillator; Pin 25 (P2.7) is connected to SCL_MCU; Pin 23 (P2.5) is connected to SDA_MCU; and the RXD and TXD pins are brought out for connection to an RS485 chip.

[0014] Furthermore, the communication module uses the MAX13487 chip.

[0015] Furthermore: the first pin RO of the MAX13487 chip is connected to the UART_RX pin of the microcontroller; the second pin RE# and the third pin DE are connected to VCC_MCU; the fourth pin DI is connected to the UART_TX pin of the microcontroller module; the fifth pin DI is connected to PGND; the sixth pin A is pulled up by a 5V voltage using resistor R2; the seventh pin B is pulled down by a PGND voltage using resistor R3; and the eighth pin VCC is connected to a 5V voltage.

[0016] This invention provides a high-precision SOC detection device for vanadium redox flow batteries. By employing a high-precision ADC chip and isolation design, it improves voltage measurement accuracy and system anti-interference capability, ensuring accurate acquisition of SOC data even in complex environments. The device supports user-defined SOC calculation equations, flexibly adapting to different battery characteristics and meeting diverse application needs. SOC data is output via an RS485 interface, enabling remote monitoring and data interaction, simplifying system integration, and is suitable for fields such as new energy storage and power peak shaving, improving system reliability and management efficiency.

[0017] The high-precision, real-time SOC monitoring function of this application can ensure the safe operation of the battery under different operating conditions, optimize energy management, and improve the efficiency of the battery system.

[0018] The vanadium redox flow battery SOC detection device of the present invention has important practical application value. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a block diagram of the device in this application;

[0021] Figure 2 This is the circuit diagram of the data acquisition module;

[0022] Figure 3 This is the circuit diagram of the isolation module;

[0023] Figure 4 This is the circuit diagram of a microcontroller module;

[0024] Figure 5 This is the circuit diagram of the communication module.

[0025] Reference numerals: 1. Acquisition module, 2. Isolation module, 3. Microcontroller module, 4. Communication module. Detailed Implementation

[0026] It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of the present invention can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and embodiments.

[0027] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, 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. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. 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.

[0028] Figure 1 This is a block diagram of the device in this application;

[0029] A high-precision SOC detection device for vanadium redox flow batteries includes: a data acquisition module 1, an isolation module 2, a microcontroller module 3, and a communication module 4;

[0030] The output terminal of the acquisition module 1 is connected to the input terminal of the isolation module 2;

[0031] The output terminal of the isolation module 2 is connected to the input terminal of the microcontroller module 3;

[0032] The output terminal of the microcontroller module 3 is connected to the input terminal of the communication module 4.

[0033] This device employs advanced hardware design, and through high-precision OCV voltage measurement and flexible SOC calculation, it solves the problems of insufficient SOC calculation accuracy and complex SOC calculation in traditional technologies, and has high accuracy and real-time performance.

[0034] The OCV module voltage from the outside first enters the acquisition module 1. The 0-2V OCV analog signal is converted into a digital signal by the acquisition module 1. The converted digital signal is transmitted to the microcontroller module 3 through the isolation circuit. The IIC bus is isolated to avoid the influence of electromagnetic interference. In the microcontroller module 3, the OCV signal is converted into a SOC signal according to the user-defined conversion equation and output through the RS485 circuit of the communication module 4. External logic processing units such as PLC or DSP can read the signal for logic control.

[0035] Figure 2 This is the circuit diagram of acquisition module 1;

[0036] First, the device's acquisition module 1 uses the high-precision ADC chip ADS1115, which can accurately measure the open-circuit voltage (OCV) within the 0-2V range. Open-circuit voltage is a crucial parameter for estimating the state of charge (SOC) of a vanadium redox flow battery. Traditional technologies rely on external equipment and complex algorithms to indirectly calculate SOC using OCV values. This patent, however, avoids errors and delays caused by external calculations by directly acquiring high-precision OCV data. The high resolution and low noise characteristics of the ADS1115 chip ensure accurate battery voltage acquisition and enable stable operation over a wide current variation range.

[0037] The ADS1115 acquisition circuit is designed as follows: the external OCV signal is connected to pin 4 AIN0 of the ADS1115 chip; pins 1 ADDR and 3 GND of the ADS1115 are grounded; pin 8 VDD is connected and a capacitor C1 (100nF) is connected in parallel to ground for filtering to remove power supply interference; pin 9 SDA is connected to VDD through a 4.7K pull-up resistor; and pin 10 SCL is connected to VDD through a 4.7K pull-up resistor.

[0038] To further improve the system's reliability and anti-interference capability, the detection circuit of this device adopts an isolation design. This isolation design effectively avoids the influence of electromagnetic interference, ensuring the stability and accuracy of voltage measurement. Especially in complex power system environments, electromagnetic interference is often the main factor affecting measurement accuracy. Through electrical isolation technology, the device can maintain high-precision voltage acquisition even in various electromagnetic noise environments, ensuring the reliability of SOC detection data.

[0039] Figure 3 This is the circuit diagram of isolation module 2;

[0040] Isolation module 2 uses the ISO1541D chip as its core chip design. Pin 1 (VCC1) of the ISO1541D chip is connected to VDD_MCU. Pins 2 (SDA1) and 3 (SCL1) are connected to VDD_MCU through 4.7K resistors. Pin 4 is connected to GND_MCU. Pin 5 is connected to GND. Pin 6 (SCL) is connected to the SCL pin of ADS1115. Pin 7 (SDA) is connected to the SDA pin of ADS1115. Pin 8 is connected to VDD and connected in parallel with capacitor C1 (100nF) to ground for filtering to remove power supply interference.

[0041] In terms of SOC calculation, the device provides programmable functionality within the microcontroller, allowing users to define their own SOC calculation equations based on different battery characteristics and operating environments. Traditional SOC estimation methods are often fixed and cannot be adjusted according to the battery characteristics in actual applications, leading to significant errors under certain operating conditions. However, through the microcontroller's programmable functionality, users can adjust the SOC calculation algorithm according to the actual battery model and operating environment to obtain more accurate SOC estimation results. Furthermore, the device supports multiple calculation methods, such as the combined use of coulombic measurement, open-circuit voltage, and battery internal resistance methods, enhancing the system's flexibility and adaptability.

[0042] Figure 4 This is the circuit diagram of microcontroller module 3;

[0043] The microcontroller (MCU) circuit is shown below. The microcontroller module uses an STM32F103VET6 chip. Pin 38 (VCC) of the STM32F103VET6 is connected to VCC_MCU (microcontroller power supply). Pin 29 (EA# / P4.6) is connected to VCC_MCU using a 4.7K resistor. Pin 4 (RST) is connected to GND using a 10K resistor. Pins 14 (XTAL2) and 15 (XTAL1) are connected to an external crystal oscillator at 11.0592MHz for clocking. Pin 25 (P2.7) is connected to SCL_MCU, and pin 23 (P2.5) is connected to SDA_MCU. The RXD and TXD pins are brought out for connecting to an RS485 chip.

[0044] Finally, the SOC data is output via an RS485 communication interface, facilitating data exchange and remote monitoring with other devices. RS485 is a commonly used industrial communication protocol with strong anti-interference capabilities and a long communication distance, making it suitable for complex industrial environments. Through the RS485 interface, the monitoring system can transmit real-time SOC data to a host computer or other devices, enabling centralized management and monitoring. This helps users understand the battery's operating status in a timely manner and perform fine-grained control over battery operation. This function not only enhances the practicality of the device but also provides more comprehensive data support for the battery management system.

[0045] Figure 5 This is the circuit diagram of communication module 4.

[0046] The RS485 circuit design is as follows: The RS485 communication module 4 uses the MAX13487 chip. The first pin RO of the chip is connected to the UART_RX pin of the microcontroller. The second pin RE# and the third pin DE are connected to VCC_MCU for automatic transmit / receive switching. The fourth pin DI is connected to the UART_TX pin of the microcontroller. The fifth pin GND is connected to PGND. The sixth pin A is pulled up by a 5V resistor R2 with a resistance of 5.1K. The seventh pin B is pulled down by a 5.1K resistor R3 connected to PGND. The eighth pin VCC is connected to a 5V voltage. D1, D2, and D3 are three bidirectional transient suppression diodes used for input line protection to prevent the MAX13487 chip from being damaged by voltage spikes introduced by the wires.

[0047] In summary, this patent solves the problems of insufficient measurement accuracy and computational complexity in traditional technologies by using a high-precision ADC chip, isolation circuit design, programmable SOC computing function, and a reliable RS485 data output interface. This device not only boasts high real-time performance and accuracy but also possesses excellent anti-interference capabilities and flexible adaptability, making it suitable for various complex battery management and monitoring scenarios, and providing strong support for the efficient operation of vanadium redox flow batteries.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A high-precision SOC detection device for a vanadium redox flow battery, characterized in that: The utility model relates to a kind of remote monitoring system of temperature and humidity, including: acquisition module, isolation module, single-chip module and communication module. The output end of the acquisition module is connected with the input end of the isolation module. The output end of the isolation module is connected with the input end of the single-chip module. The output end of the single-chip module is connected with the input end of the communication module. The model of the acquisition module is ADS1115 chip. 2.The high-precision SOC detection device for a vanadium redox flow battery according to claim 1, characterized in that: The fourth pin AIN0 of the ADS1115 chip is connected with open-circuit voltage signal, the first pin ADDR and the third pin GND of ADS1115 are grounded, the eighth pin VDD of ADS1115 chip is connected with C1 capacitor in parallel, the ninth pin SDA of ADS1115 chip is connected with VDD through pull-up 4.7K resistor, and the tenth pin SCL of ADS1115 chip is connected with VDD through pull-up 4.7K resistor. 3.The high-precision SOC detection device for a vanadium redox flow battery according to claim 2, characterized in that: The chip model of the isolation module is ISO1541D chip. 4.The high-precision SOC detection device for a vanadium redox flow battery according to claim 2, characterized in that: The first pin VCC1 of the ISO1541D chip is connected with VDD_MCU, the second pin SDA1 and the third pin SCL1 are connected with VDD_MCU through 4.7K resistor respectively, the fourth pin GND1 is connected with GND_MCU, the fifth pin GND2 is connected with GND, the sixth pin SCL2 is connected with the SCL pin of ADS1115, the seventh pin SDA is connected with the SDA pin of ADS1115, and the eighth pin VCC2 is connected with C1 capacitor in parallel.

5. The high-precision SOC detection device for a vanadium redox flow battery according to claim 4, characterized in that: The chip model of the single-chip module is STM32F103VET6. 6.The high-precision SOC detection device for a vanadium redox flow battery according to claim 1, characterized in that: The thirty-eighth pin VCC of the STM32F103VET6 is connected with VCC_MCU, the twenty-ninth pin P4.6 is connected with VCC_MCU using 4.7K resistor, the fourth pin RST is connected with GND using 10K resistor, the fourteenth pin XTAL2 and the fifteenth pin XTAL1 are connected with external crystal oscillator, the twenty-fifth pin P2.7 is connected with SCL_MCU, the twenty-third pin P2.5 is connected with SDA_MCU, the RXD pin and the TXD pin are led out and used for connecting RS485 chip.

7. The high-precision SOC detection device for a vanadium redox flow battery according to claim 6, characterized in that: The chip model of the communication module is MAX13487 chip. 8.The high-precision SOC detection device for a vanadium redox flow battery according to claim 1, characterized in that: The first pin RO of the MAX13487 chip is connected with the UART_RX pin of single-chip, the second pin RE#, the third pin DE is connected with VCC_MCU, the fourth pin DI is connected with the UART_TX pin of single-chip module, the fifth pin DI is connected with PGND, the sixth pin A is connected with 5V voltage for pull-up using R2 resistor, the seventh pin B is connected with PGND voltage for pull-down using R3 resistor, and the eighth pin VCC is connected with 5V voltage. 9.The high-precision SOC detection device for a vanadium redox flow battery according to claim 8, characterized in that: ​

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