CN111812537A - Online real-time monitoring system for internal resistance of storage battery - Google Patents
Online real-time monitoring system for internal resistance of storage battery Download PDFInfo
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- CN111812537A CN111812537A CN202010477135.2A CN202010477135A CN111812537A CN 111812537 A CN111812537 A CN 111812537A CN 202010477135 A CN202010477135 A CN 202010477135A CN 111812537 A CN111812537 A CN 111812537A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/371—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC] with remote indication, e.g. on external chargers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/389—Measuring internal impedance, internal conductance or related variables
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/392—Determining battery ageing or deterioration, e.g. state of health
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- G—PHYSICS
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C19/00—Electric signal transmission systems
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Abstract
The invention discloses an online real-time monitoring system for internal resistance of a storage battery, which relates to the technical field of storage battery monitoring and comprises a storage battery internal resistance data acquisition terminal, a data concentrator and a server management platform, wherein the storage battery internal resistance data acquisition terminal measures the internal resistance of the storage battery through hardware, processes the internal resistance of the storage battery through MCU data and communicates interactive data with the data concentrator through a 485 bus; the data concentrator uploads the data acquired by the multi-path storage battery internal resistance data acquisition terminal to the server through the network switch and the router, the storage battery running state is monitored on line through the management computer, and the data uploaded by the data concentrator interacts with the server management platform; and the server management platform inquires and displays the internal resistance measurement data of the data management center. The method can be effectively used for measuring the internal resistance of the lead-acid storage battery, the measurement result is stable, reliable and effective, and a user can monitor and know the health state of the storage battery in real time through multiple platforms.
Description
Technical Field
The invention relates to the technical field of storage battery monitoring, in particular to an online real-time monitoring system for internal resistance of a storage battery.
Background
In modern society, it is difficult to imagine economic and socio-political damage to governments when the power grid is broken down. There is an UPS (universal Power System/universal Power Supply), which is an Uninterruptible Power Supply, and the application of the Uninterruptible Power Supply is now wide, such as server rooms, network devices, data storage devices, hospitals, national defense, substations, Power stations, nuclear Power stations, and so on. The precise network equipment and communication equipment do not allow power interruption, so the reliability of the storage battery is related to the safety and stability of the whole system. The failure or insufficient capacity of the storage battery may cause a serious accident. Therefore, online detection and monitoring of the storage battery are always hot problems of domestic and foreign research.
For a long time, the detection of battery pack parameters has been limited to voltage, specific gravity, temperature, etc., but these parameters are not sufficient to reflect the performance of the battery. Another important parameter of the state of the storage battery pack is the internal resistance of the storage battery pack, and the internal resistance of the storage battery pack can be reflected from the internal resistance change of the storage battery pack no matter the storage battery pack is about to lose efficacy, has insufficient capacity or is not properly charged and discharged. The internal resistance of the storage battery is closely related to the chemical reaction inside the storage battery, the charge-discharge characteristics of the storage battery are influenced, and the internal resistance of the storage battery is inevitably increased when the performance of the storage battery is degraded. Because there is a good correlation between the capacity and the internal resistance of the battery, generally speaking, the larger the capacity of the storage battery is, the smaller the internal resistance thereof is, and the capacity of the battery can be evaluated on line by measuring the internal resistance of the storage battery.
Disclosure of Invention
The invention aims to solve the defects in the prior art and provides an online real-time monitoring system for internal resistance of a storage battery.
In order to achieve the purpose, the invention adopts the following technical scheme:
an on-line real-time monitoring system for internal resistance of a storage battery comprises a storage battery internal resistance data acquisition terminal, a data concentrator and a server management platform, wherein,
the storage battery internal resistance data acquisition terminal measures the internal resistance of the storage battery through hardware, processes the storage battery internal resistance through MCU data, and communicates and interacts data with the data concentrator through a 485 bus;
the data concentrator uploads data acquired by a plurality of paths of storage battery internal resistance data acquisition terminals to a server through a network switch and a router, the storage battery running state is monitored on line through a management computer, and the data uploaded by the data concentrator interacts with the server management platform;
and the server management platform inquires and displays the internal resistance measurement data of the data management center.
Preferably, the storage battery internal resistance data acquisition terminal comprises a microcontroller, an alternating current constant current signal generation circuit, a storage battery measurement circuit, a differential amplification circuit, an ADC signal acquisition circuit, a power supply circuit and a 485 communication circuit, wherein an alternating current signal generated by the alternating current constant current signal generation circuit passes through a current sampling resistor and then is injected into the storage battery through a voltage sampling signal, the storage battery measurement circuit measures voltages at two ends of the storage battery through a voltage sampling resistor and the voltage at two ends of the storage battery, the voltages are filtered by the differential amplification circuit and then are sent to the microcontroller, and the microcontroller sends data to the data concentrator through the 485 communication circuit.
Preferably, the data concentrator includes a central processing unit, and the central processing unit is connected with an sdcad module, a USB module, and a network module.
Preferably, the network module includes a wired module and a wireless module.
Preferably, the central server platform comprises a user home page display module, a user management and login module, a storage battery internal resistance monitoring and alarming module, a storage battery internal resistance historical data derivation module and a storage battery internal resistance data curve module.
According to the invention, an alternating current constant current signal is injected into the storage battery, the internal resistance of the storage battery is calculated through the voltage ratio measured by the microcontroller according to the monitoring resistance and the voltage at two ends of the storage battery, the measured data is uploaded to the server database by using the 485 bus, and the server platform analyzes the measured data according to the uploaded internal resistance data of the storage battery to draw a curve diagram, so that the internal resistance change condition of the storage battery is conveniently known. The method can be effectively used for measuring the internal resistance of the lead-acid storage battery, the measurement result is stable, reliable and effective, and a user can monitor and know the health state of the storage battery in real time through multiple platforms.
Drawings
Fig. 1 is a schematic structural diagram of an online real-time monitoring system for internal resistance of a storage battery according to the present invention;
FIG. 2 is a schematic circuit diagram of a storage battery internal resistance data acquisition terminal in the storage battery internal resistance online real-time monitoring system provided by the invention;
FIG. 3 is a schematic circuit diagram of a microcontroller in the on-line real-time monitoring system for the internal resistance of the storage battery according to the present invention;
FIG. 4 is a schematic circuit diagram of a battery measurement circuit in the online real-time battery internal resistance monitoring system according to the present invention;
FIG. 5 is an ADC signal acquisition circuit in the on-line real-time monitoring system for the internal resistance of the storage battery provided by the invention;
fig. 6 is a schematic circuit diagram of a 485 communication circuit in the online real-time monitoring system for the internal resistance of the storage battery provided by the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Referring to fig. 1, the online real-time monitoring system for the internal resistance of the storage battery comprises a storage battery internal resistance data acquisition terminal, a data concentrator and a server management platform, wherein the storage battery internal resistance data acquisition terminal measures the internal resistance of the storage battery through hardware, processes MCU data and communicates and interacts data with the data concentrator through a 485 bus; the data concentrator uploads the data acquired by the plurality of paths of storage battery internal resistance data acquisition terminals to a server through a network switch and a router, the storage battery running state is monitored on line through a management computer, and the data uploaded by the data concentrator interacts with the server management platform; and the server management platform inquires and displays the internal resistance measurement data of the data management center.
As shown in fig. 2, the storage battery internal resistance data acquisition terminal includes a microcontroller, an alternating current constant current signal generation circuit, a storage battery measurement circuit, a differential amplification circuit, an ADC signal acquisition circuit, a power supply circuit, and a 485 communication circuit. An alternating current signal generated by an alternating current constant current source with hundreds of milliamperes passes through a current sampling resistor and a voltage sampling signal and is injected into the storage battery, a small-signal alternating current signal is excited at two ends of the storage battery due to impedance inside the storage battery, and the small-signal alternating current signal is transmitted to the embedded Cortex-M4 after differential amplification and filtering by measuring the voltage at the voltage sampling resistor and the two ends of the storage battery. The embedded and Cortex-M4 calculates the internal resistance of the battery by calculating the voltage sampling resistance, since the voltage sampling resistance is known. The data is sent to the data concentrator via the 485 circuit.
The microcontroller of the embodiment is based on an STM32F405RGT6 of an ST core of 32-bit Cortex-M4 of ARM company, and the principle diagram is shown in FIG. 3, the STM32F405RGT6 has a large capacity of 1M Flash and 192KbytesSRAM, the main frequency is 168MHz, and the microcontroller has rich peripheral interfaces. In the figure, R2 and C19 are power-on reset circuits, C17, C18 and Y1 are external clock circuits, C22-C26 are power supply filter capacitors, R3 and R5 are pull-down resistors, MCU is started from Flash by default, P2 is an ST-Link download debugging interface, and P3 is a serial port debugging interface. DAC _ SINE and DAC _ OFFSET are DAC output, DAC _ SINE generates a SINE wave with a peak value of 2V, DAC _ OFFSE generates a voltage signal of 1V, pins of ADC7606 are all control pins and data pins of AD7606, RS485_ Tx and RS485_ Rx are respectively transmitting and receiving pins of RS485, and RS485_ EN is an RS485 transmitting and receiving enabling pin.
The schematic diagram of the battery measurement circuit of this embodiment is shown in fig. 4, where U9B is OPA2227, OPA2227 is a high-gain, low-noise dual-channel operational amplifier, and U9A is a subtraction operational circuit, and is used for dc bias, when R9 is used as a dc bias12＝R16,R13＝R14,
Since the ac constant current source needs to input a sine wave with positive and negative voltages, but sine waves generated by the STM32DAC are all positive and negative, the sine waves are biased half way down, and are generated as 2V peak-to-peak, so that the sine waves are biased 1V down. U10 is OPA548, and OPA548 is a big voltage, heavy current operational amplifier, can output 0-3A electric current continuously and can output 5A at most, can limit the output maximum current through setting up 3 pin Im. Because the current measuring circuit needs to generate a current of 100mA, most of the commonly used operational amplifiers only have dozens of mA, and a large-current operational amplifier is needed. Here OPA548 is a sinusoidal ac constant current source with U9B and OPA2227U9B is primarily a voltage follower to eliminate the effect of resistors R28 and R29 on R27.
So the output current of the circuit is 200 mA. U8 and U11 are AD620, and AD620 is a single-chip instrument amplifier of ADI company, and adopts a classic three-operational amplifier improved design.
The schematic diagram of the ADC signal acquisition circuit of this embodiment is shown in fig. 5, and it adopts AD7606-8 channel synchronous sampling input of ADI corporation, true bipolar input voltage range is ± 10V and ± 5V, 5V single analog power input, driving voltage is 2.3V-5V, AD7606 also has analog input clamp protection circuit, has 1M Ω analog input impedance buffer, has second order anti-aliasing filter inside, integrates precision reference voltage and buffering in chip, all channels have 16 bits, 200KPS ADC. The data interface provides a flexible parallel/serial interface. This time by turning D15 low and
the/SER/BYTE _ SEL pin is connected with a high level to select a serial interface mode. The RANGE pin is a voltage RANGE selection pin, and the RANGE pin is connected with a high level to select the RANGE of the analog input voltage to be +/-10V.
The pin is set to standby mode
Set high not to enter standby mode. The REF _ SELECT pin is used as an internal/external reference voltage selection input, and the circuit is connected with a high level to SELECT an internal reference voltage.
The pin is chip selection, the low level is effective, CONVSTA and CONVSTB enable the conversion of analog input channels, D7/DOUTA and D8/DOUTB are data output pins, DOUTA is used for data output of channels V1-V4 in a serial mode, and DOUTB is used for data output of channels V5-V8. OS2-OS1 are oversampling mode pins used to select an oversampling multiplier. BUSY is a pin with BUSY output, when the conversion process is carried out, the secondary pin outputs high level, when the conversion is completed, low level is output, SCLK is a clock pin in a serial mode, and control input is read in parallel. The capacitors in the figure are all decoupling capacitors. AD7606 measured voltage calculation formula:
The schematic diagram of the 485 communication circuit of the embodiment is shown in fig. 6, in the diagram, B0505 is a DC-DC isolation non-stabilized power supply and provides a power supply for ADM2483, the ADM2483 is an isolated serial port to RS485 chip of the AD company, two power supply inputs are required, the serial port input is provided by a 3.3V power supply, the 485 output side is provided by a 5V power supply through the B0505 chip, and thus the isolation function can be completely achieved. In the figure, D5, D6 and D7 are transient diodes, and F2 and F3 self-recovery fuses play the role of input protection and prevent the mistaken high voltage from being connected into the AB terminal.
In the data concentrator of this embodiment, Raspberry Pi 3Model B is used, the central processing unit adopts a BCM2837 chip of Broadcom corporation, the BCM2837 chip uses a Cortex-a53(ARMv8) 64-bit quad-core cluster of ARM corporation, and the ARM core operates at 1.2 GHZ. The concentrator comprises an SDCrad module, a USB module and a network module. The SDcard in SDcard module circuit will store Linux file system, USB and network module used LAN9512, LAN9512 integrates high speed 2.0 hub and high performance 10/100 Ethernet controller, providing a low cost, high power, small size USB to Ethernet port and multi-port USB connection solution specially for system architecture.
The server management platform of this embodiment can log in and manage through user name and password, data that upload to the server through the data concentrator carry out battery internal resistance monitoring and show in real time, it leads to the internal resistance grow or the internal resistance grow that leads to that the battery is ageing to appear unusually to lead to the battery, this platform also can show alarm data and show, this platform also provides historical derivation module, the user can very conveniently derive and carry out analytical study to historical data, for convenience of customers directly perceived understanding battery running state, the platform can be drawn data with the mode of curve chart, very clear show the recent battery internal resistance situation of change.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (5)
1. An on-line real-time monitoring system for internal resistance of a storage battery is characterized by comprising a storage battery internal resistance data acquisition terminal, a data concentrator and a server management platform, wherein,
the storage battery internal resistance data acquisition terminal measures the internal resistance of the storage battery through hardware, processes the storage battery internal resistance through MCU data, and communicates and interacts data with the data concentrator through a 485 bus;
the data concentrator uploads data acquired by a plurality of paths of storage battery internal resistance data acquisition terminals to a server through a network switch and a router, the storage battery running state is monitored on line through a management computer, and the data uploaded by the data concentrator interacts with the server management platform;
and the server management platform inquires and displays the internal resistance measurement data of the data management center.
2. The system of claim 1, wherein the terminal for collecting the internal resistance data of the storage battery comprises a microcontroller, an alternating current constant current signal generating circuit, a storage battery measuring circuit, a differential amplifying circuit, an ADC signal collecting circuit, a power supply circuit and a 485 communication circuit, wherein the alternating current constant current signal generating circuit generates an alternating current signal, the alternating current signal passes through a current sampling resistor and a voltage sampling signal and is injected into the storage battery, the storage battery measuring circuit measures the voltage at the two ends of the storage battery through the voltage sampling resistor and the voltage at the two ends of the storage battery, the voltage sampling resistor and the voltage are filtered by the differential amplifying circuit and then are sent to the microcontroller, and the microcontroller sends data to the data concentrator through the 485 communication circuit.
3. The system for on-line real-time monitoring of internal resistance of storage batteries according to claim 1, wherein the data concentrator comprises a central processing unit, and the central processing unit is connected with a SDCrad module, a USB module and a network module.
4. The online real-time monitoring system for the internal resistance of the storage battery as claimed in claim 3, wherein the network module comprises a wired module and a wireless module.
5. The system for on-line real-time monitoring of the internal resistance of the storage battery according to claim 1, wherein the central server platform comprises a user home page display module, a user management and login module, a storage battery internal resistance monitoring and alarming module, a storage battery internal resistance historical data derivation module and a storage battery internal resistance data curve module.
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| CN202010477135.2A CN111812537A (en) | 2020-05-29 | 2020-05-29 | Online real-time monitoring system for internal resistance of storage battery |
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| CN202010477135.2A CN111812537A (en) | 2020-05-29 | 2020-05-29 | Online real-time monitoring system for internal resistance of storage battery |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112903164A (en) * | 2021-03-09 | 2021-06-04 | 武汉三江航天远方科技有限公司 | Detection device for simultaneously monitoring internal resistance load pressure and elastic deformation on line |
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2020
- 2020-05-29 CN CN202010477135.2A patent/CN111812537A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112903164A (en) * | 2021-03-09 | 2021-06-04 | 武汉三江航天远方科技有限公司 | Detection device for simultaneously monitoring internal resistance load pressure and elastic deformation on line |
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