CN207457464U - A kind of accumulator wireless monitor system based on technology of Internet of things - Google Patents

Abstract

The utility model is related to a kind of accumulator wireless monitor systems based on technology of Internet of things, including power module, controller, data acquisition module, wireless sending module, wireless receiving module, host computer, wherein, controller is connected respectively with power module, data acquisition module, wireless sending module；Data acquisition module includes voltage acquisition module, current acquisition module, internal resistance acquisition module, temperature collecting module, is respectively used to voltage, electric current, internal resistance and the battery surface temperature data of acquisition accumulator, and is transferred to controller；Wireless sending module is used to send voltage, electric current, internal resistance and the battery surface temperature data in controller；Wireless receiving module is used to receive the data of wireless sending module transmission and is transferred to host computer, real-time radio monitoring is carried out so as to fulfill to performance parameters such as the charging/discharging voltage of accumulator, electric current, temperature, internal resistances, be conducive to find and replace fail battery in time, to improve the stability of accumulator group power supply.

Description

A wireless battery monitoring system based on Internet of Things technology

technical field

The utility model relates to the technical field of storage battery state monitoring, in particular to a storage battery wireless monitoring system based on the Internet of Things technology.

Background technique

Nowadays, people are more and more dependent on electric energy, which puts forward higher requirements for the stability of power supply. As a backup power supply for a set of equipment or systems, batteries play a very important role in mobile communication base stations, new energy power generation systems, or other occasions where batteries are used. The stability of batteries is directly related to equipment or systems. Whether it can run normally, it is particularly important to monitor the performance parameters and health status of the battery. Lead-acid batteries, as the power supply equipment with the largest flow in the market, are widely used in some large-scale equipment, and the number of batteries involved ranges from hundreds to thousands. Therefore, the monitoring of battery performance parameters and The evaluation of battery health status has always been an important topic of research by experts from various countries.

In the energy storage system, the battery pack is usually in a state of floating charge, and only when the mains power is interrupted or the conditions for new energy generation are insufficient, the battery pack starts to discharge to provide reliable power for the equipment. It is precisely because of this characteristic of the battery pack that even if the battery occasionally discharges, it is difficult for the user to notice it. If the faulty battery is not replaced in time, the power supply stability of the system will be poor, and the system may be paralyzed in severe cases. Therefore, in the operation of the battery During the process, how to monitor the health status of the battery has become the most concerned issue for users.

In recent years, with the maturity of wireless communication technology, wireless communication technology has been applied to various occasions; the most representative wireless communication technologies are Bluetooth technology, WIFI technology, Zig-Bee wireless communication technology, among them, Bluetooth technology and WIFI technology has the disadvantages of complex technology, high power consumption, short wireless communication distance, and small networking scale; compared with Bluetooth technology and WIFI technology, Zig-Bee is a low-power, low-cost, and high-security technology. , The communication distance is long, and a wireless communication technology that works in the 2.4GHZ and 868/928MHZ global frequency bands, Zig-Bee, as a representative of the Internet of Things technology, has been widely used in various fields.

However, most of the traditional battery monitoring methods use manual detection or wired detection. They all have disadvantages such as difficult wiring, no real-time performance, and low efficiency. It is difficult to realize real-time online monitoring of battery performance parameters.

Utility model content

The purpose of this utility model is to improve the existing deficiencies in the prior art, and to provide a battery wireless monitoring system based on the Internet of Things technology, which can perform real-time wireless monitoring of battery charging and discharging voltage, current, temperature, internal resistance and other performance parameters , so as to find and replace the faulty battery in time to improve the stability of the battery power supply.

The technical solution adopted by the utility model to solve the technical problem is: a battery wireless monitoring system based on Internet of Things technology, including a power supply module, a controller, a data acquisition module, a wireless transmission module, a wireless reception module, and a host computer, wherein,

The controller is respectively connected with the power supply module, the data acquisition module and the wireless transmission module;

The data acquisition module includes a voltage acquisition module, a current acquisition module, an internal resistance acquisition module, and a temperature acquisition module, which are respectively used to collect the voltage, current, internal resistance and battery surface temperature data of the storage battery, and transmit them to the controller through the serial communication interface. device;

The wireless sending module is used to send voltage, current, internal resistance and battery surface temperature data in the controller;

The wireless receiving module is used to receive the data sent by the wireless sending module and transmit it to the upper computer.

Preferably, the controller adopts STM32F10x series single-chip microcomputer. The STM32F10x series single-chip microcomputer is used as the MCU of this system, because of its high integration, it is superior to the traditional 80C51 single-chip microcomputer in terms of precision and operating speed, so that the STM32F10x series single-chip microcomputer can effectively control each module in the system. work.

Preferably, both the wireless sending module and the wireless receiving module use Zig-Bee radio frequency transceiver chip CC2650. The wireless radio frequency transceiver chip CC2650 is a small Zig-Bee wireless communication chip of "MCU+RF chip", and the power consumption of the CC2650 is very low, and a 48MHZ Cortex-M3 processor is embedded inside, and it exchanges data with the MCU through the SPI interface , so that the data receiving/sending function can be completed quickly, efficiently and with low power consumption.

Preferably, the power supply module includes an LM2596S DC-DC adjustable step-down module, and the LM2596SDC-DC adjustable step-down module is used to convert the 12V voltage signal output by the battery into a 3.3V voltage signal. Since the reference operating voltage of the STM32F10x series single-chip microcomputer is 3.3V, and the reference operating voltage of the Zig-Bee radio frequency chip CC2650 is 1.8-3.8V, the LM2596SDC-DC adjustable step-down module is used in the power supply module, and the 12V of the battery The voltage signal is converted into a 3.3V voltage signal to ensure that both the STM32F10x series microcontroller and the Zig-Bee radio frequency chip CC2650 can work normally.

Preferably, the voltage acquisition module includes a voltage divider module and an optocoupler isolation module, and the optocoupler isolation module is used to prevent field interference signals from entering the controller. The voltage divider module includes two precision resistors, which are respectively connected to the two ends of the battery, and then the divided signal is taken out from between the two resistors, and the resistance value of the two precision voltage divider resistors is changed , you can measure the battery terminal voltage with a specification of 6V or 12V.

Further, an HCN201 optocoupler is used in the optocoupler isolation module. HCN201 optocoupler has high-precision linear characteristics, which can well isolate the interference signal from the controller.

Preferably, the current acquisition module is connected in series in the battery pack, and the current acquisition module includes a Hall current sensor module, a current conversion module, and an A/D conversion module; the Hall current sensor module is used to sample the current signal of the battery pack, and the sampled The current signal is converted into a voltage signal by the current conversion module, and the voltage signal is transmitted to the controller after being converted by the A/D conversion module. Because in order to ensure that the battery can work normally, the charging current and discharging current of the battery must be maintained within a specific range. Usually the storage battery pack is formed by a number of storage batteries connected in series, so each storage battery pack must be equipped with a current acquisition module.

Preferably, the internal resistance acquisition module includes an analog multiplier module, a low-pass filter module, a DC amplification module, an A/D conversion module, an AC differential circuit module connected in parallel to the battery, and a constant current source module; the voltage response at both ends of the battery After the signal passes through the AC differential circuit module, it is multiplied by the sinusoidal signal that generates a constant AC source in the analog multiplier module. After the output voltage signal of the analog multiplier module passes through the low-pass filter module, the AC signal is converted into a DC signal. The DC signal After being amplified by the DC amplifier module, it is transmitted to the A/D conversion module for analog-to-digital conversion, and the converted value is transmitted to the controller.

Preferably, the temperature acquisition module uses a DS18B20 temperature sensor. The DS18B20 temperature sensor uses an advanced single bus for data communication, full digital temperature conversion and output, and can monitor the temperature of the battery surface in real time.

Preferably, the host computer is a PC, and the PC is used for online monitoring and evaluation of the storage battery. The PC is provided with a battery real-time monitoring interface designed with LabVIEW software, and the performance parameter data of the battery transmitted through the wireless receiving module can be presented on the PC in real time, thereby realizing online monitoring and evaluation of the battery.

Compared with the existing system, the beneficial effect of using a battery wireless monitoring system based on the Internet of Things technology provided by the utility model is that it can monitor the performance parameters of the battery in real time, and adopt advanced Internet of Things wireless communication technology to The collected performance parameter data such as charging and discharging voltage, current, temperature, and internal resistance of the battery are transmitted to the host computer, so as to realize real-time wireless monitoring and evaluation of the battery, and facilitate timely detection and replacement of faulty batteries, thus effectively improving the efficiency of the battery pack. The stability of power supply also saves manpower and material resources, further guarantees the safety of users' lives, and avoids losses caused by chain reactions of failures.

Description of drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following drawings will be briefly introduced in the embodiments. It should be understood that the following drawings only show some embodiments of the present invention. Therefore, it should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained according to these drawings without creative work.

Fig. 1 is an overall block diagram of a battery wireless monitoring system based on the Internet of Things technology provided by an embodiment of the present invention.

Fig. 2 is a schematic circuit diagram of a voltage acquisition module in a battery wireless monitoring system based on the Internet of Things technology provided by an embodiment of the present invention.

Fig. 3 is a schematic circuit diagram of a current acquisition module in a battery wireless monitoring system based on the Internet of Things technology provided by an embodiment of the present invention.

FIG. 4 is a schematic circuit diagram of an internal resistance acquisition module in a battery wireless monitoring system based on the Internet of Things technology provided by an embodiment of the present invention.

Fig. 5 is a schematic circuit diagram of a temperature acquisition module in a battery wireless monitoring system based on the Internet of Things technology provided by an embodiment of the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. . The components of the embodiments of the invention generally described and illustrated in the figures herein may be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without making creative efforts belong to the scope of protection of the present utility model.

Example 1

Please refer to Figure 1. This embodiment provides a battery wireless monitoring system based on the Internet of Things technology. The battery in the wind-solar hybrid power generation system is used as the monitoring object of the wireless monitoring system. The wireless monitoring system mainly includes a power module, a control Device, data acquisition module, wireless sending module, wireless receiving module, host computer.

The controller is respectively connected with the power supply module, the data acquisition module, and the wireless transmission module; in this embodiment, the controller adopts a STM32F10x series single-chip microcomputer. The STM32F10x series single-chip microcomputer is used as the MCU of this system, because of its high integration, it is superior to the traditional 80C51 single-chip microcomputer in terms of precision and operating speed, so that the STM32F10x series single-chip microcomputer can effectively control each module in the system. Specifically, the STM32F10x series single-chip microcomputer in this system is also connected with the battery charging and discharging module in the wind-solar hybrid power generation system, which is convenient for controlling each sub-module in the data acquisition module to collect the voltage, current, and battery surface when the battery is charging and discharging. Temperature and battery internal resistance and other parameters, and control the wireless sending module to send the monitored parameters to the host computer.

The wireless sending module is used to send the voltage, current, internal resistance and battery surface temperature data in the controller; in this embodiment, the wireless sending module uses the Zig-Bee radio frequency transceiver chip CC2650. The wireless radio frequency transceiver chip CC2650 is a small Zig-Bee wireless communication chip of "MCU+RF chip", and the power consumption of the CC2650 is very low, and a 48MHZ Cortex-M3 processor is embedded inside, and it exchanges data with the MCU through the SPI interface , so that the data receiving/sending function can be completed quickly, efficiently and with low power consumption.

The wireless receiving module is used to receive the data sent by the wireless sending module and transmit it to the host computer for online evaluation; the wireless receiving module also uses the Zig-Bee wireless radio frequency transceiver chip CC2650.

In this embodiment, the power supply module includes an LM2596S DC-DC adjustable step-down module; since the reference operating voltage of the STM32F10x series single-chip microcomputer is 3.3V, and the reference operating voltage of the Zig-Bee radio frequency chip CC2650 is 1.8-3.8V, so The LM2596S DC-DC adjustable step-down module is used in the power module to convert the 12V voltage signal of the battery into a 3.3V voltage signal to ensure that the STM32F10x series single-chip microcomputer and the Zig-Bee radio frequency chip CC2650 can work normally.

The data acquisition module includes a voltage acquisition module, a current acquisition module, an internal resistance acquisition module, and a temperature acquisition module, which are respectively used to collect the voltage, current, internal resistance and battery surface temperature data of the battery, and transmit them to the controller through the serial communication interface. in:

As shown in Figure 2, the voltage acquisition module includes a voltage divider module and an optocoupler isolation module. The voltage divider module includes two precision resistors (R1 and R2). Take out the signal after voltage division between two resistors, by changing the resistance value of these two precision voltage divider resistors, you can measure the battery terminal voltage with a specification of 6V or 12V; the optocoupler isolation module is connected in parallel to one of the resistors (in parallel with R2), and connected in series with the controller, to avoid field interference signal from entering the controller;

In one solution, the optocoupler isolation module uses the HCN201 optocoupler; the HCN201 optocoupler has high-precision linear characteristics, and can well isolate the interference signal from the controller.

In order to ensure the normal operation of the battery, the charging current and discharging current of the battery must be maintained within a specific range. Usually, the battery pack is composed of several batteries connected in series, so each battery pack must be equipped with a Current acquisition module; as shown in Figure 3, in the present embodiment, the current acquisition module is connected in series in the battery pack, and the current acquisition module includes a Hall current sensor module, a current conversion module, and an A/D conversion module; the Hall current The sensor module is used to sample the current signal of the battery pack. The sampled current signal is converted into a voltage signal by the current conversion module. The voltage signal is converted by the A/D conversion module and transmitted to the controller for processing. After obtaining the value of the measured voltage , the current data of the battery can be obtained after conversion.

As shown in Figure 4, the internal resistance acquisition module includes an analog multiplier module, a low-pass filter module, a DC amplifier module, an A/D conversion module, an AC differential circuit module connected in parallel to the battery, and a constant current source module; the voltage at both ends of the battery After the response signal passes through the AC differential circuit module, it is multiplied by the sinusoidal signal that generates a constant AC source in the analog multiplier module. After the output voltage signal of the analog multiplier module passes through the low-pass filter module, the AC signal is converted into a DC signal, and the DC signal is converted into a DC signal. The signal is amplified by the DC amplifier module and then transmitted to the A/D conversion module for analog-to-digital conversion, and the converted value is transmitted to the controller for processing to obtain the internal resistance data of the battery.

The temperature acquisition module includes a DS18B20 temperature sensor. In this embodiment, as shown in Figure 5, the VDD pin of the DS18B20 is connected to a working voltage of 5.0V, the GND pin is grounded, and the DQ pin is connected to the I/O port of the controller. , There is a pull-up resistor R connected in parallel between the VDD pin and the DQ pin; since the DS18B20 temperature sensor uses an advanced single bus for data communication, full digital temperature conversion and output, it can effectively monitor the temperature of the battery surface in real time.

In this embodiment, the upper computer is a PC; the PC is used for online monitoring and evaluation of the storage battery. The PC in this embodiment is provided with a battery real-time monitoring interface designed with LabVIEW software, and the battery performance parameter data transmitted through the wireless receiving module can be presented on the PC in real time, thereby realizing online monitoring and evaluation of the battery.

The above is only a specific embodiment of the present utility model, but the scope of protection of the present utility model is not limited thereto. Anyone familiar with the technical field can easily think of changes or changes within the technical scope disclosed by the utility model Replacement should be covered within the protection scope of the present utility model.

Claims (10)

1. A storage battery wireless monitoring system based on the Internet of Things technology, characterized in that it comprises a power supply module, a controller, a data acquisition module, a wireless sending module, a wireless receiving module, and a host computer, wherein, The controller is respectively connected with the power supply module, the data acquisition module and the wireless transmission module; The data acquisition module includes a voltage acquisition module, a current acquisition module, an internal resistance acquisition module, and a temperature acquisition module, which are respectively used to collect the voltage, current, internal resistance and battery surface temperature data of the storage battery, and transmit them to the controller through the serial communication interface. device; The wireless sending module is used to send voltage, current, internal resistance and battery surface temperature data in the controller; The wireless receiving module is used to receive the data sent by the wireless sending module and transmit it to the upper computer. 2. The storage battery wireless monitoring system based on the Internet of Things technology according to claim 1, wherein the controller adopts a STM32F10x series single-chip microcomputer. 3. The storage battery wireless monitoring system based on the Internet of Things technology according to claim 1, characterized in that, both the wireless sending module and the wireless receiving module adopt Zig-Bee wireless radio frequency transceiver chip CC2650. 4. The battery wireless monitoring system based on the Internet of Things technology according to claim 1, wherein the power supply module includes an LM2596S DC-DC adjustable step-down module, and the LM2596S DC-DC adjustable step-down module is used for It is used to convert the 12V voltage signal output by the battery into a 3.3V voltage signal. 5. The battery wireless monitoring system based on the Internet of Things technology according to claim 1, wherein the voltage acquisition module includes a voltage divider module and an optocoupler isolation module, and the optocoupler isolation module is used to avoid on-site interference signals into the controller. 6. The battery wireless monitoring system based on the Internet of Things technology according to claim 5, characterized in that, the optocoupler isolation module adopts HCN201 optocoupler. 7. The storage battery wireless monitoring system based on the Internet of Things technology according to claim 1, wherein the current collection module is connected in series in the battery pack, and the current collection module includes a Hall current sensor module, a current conversion module, an A/ D conversion module; the Hall current sensor module is used for sampling the current signal of the battery pack, the sampled current signal is converted into a voltage signal by the current conversion module, and the voltage signal is transmitted to the controller after being converted by the A/D conversion module. 8. The storage battery wireless monitoring system based on the Internet of Things technology according to claim 1, wherein the internal resistance acquisition module includes an analog multiplier module, a low-pass filter module, a DC amplification module, an A/D conversion module, The AC differential circuit module and constant current source module connected in parallel on the battery; the voltage response signal at both ends of the battery passes through the AC differential circuit module and is multiplied by the sinusoidal signal that generates a constant AC source in the analog multiplier module, and the output of the analog multiplier module After the voltage signal passes through the low-pass filter module, the AC signal is converted into a DC signal, and the DC signal is amplified by the DC amplification module and then transmitted to the A/D conversion module for analog-to-digital conversion, and the converted value is transmitted to the controller. 9. The battery wireless monitoring system based on the Internet of Things technology according to claim 1, wherein the temperature acquisition module uses a DS18B20 temperature sensor. 10. The battery wireless monitoring system based on the Internet of Things technology according to claim 1, wherein the upper computer is a PC.