| Battery is playing a vital role in the automotive,communications,electricity,railways,electric vehicles and other fields as a backup power supply.During battery service,making a real-time monitoring and maintenance is of essence crucial.The characteristic parameters such as voltage,resistance,and temperature of the battery and the relationship between them can reflect the complex internal changes of battery.Through detecting changes for voltage,resistance and temperature of the battery can provide a certain reference for battery management.This paper takes lead-acid batteries as the research object,makes a survey,analysis and comparison for the battery parameters test equipment and instruments,which are widely used by people.In view of their shortcomings,the paper designed a set of battery parameters on-line monitoring system.The system can measure parameters such as charge or discharge current,total voltage of the battery pack,and parameters such as voltage,internal resistance,and temperature of the single battery accurately.At present,substation makes use of the method to determine the remaining capacity of the battery by checking the discharge capacity,which will result in a great waste of manpower,material resources and energy.In order to overcome these shortcomings,under the guidance of normalization and finite element method,the SOC estimation method of lead-acid battery based on Kalman filter algorithm is proposed.As a digital,information on-line monitoring system,battery online system is to save time,operate more conveniently and monitor the entire life cycle of the battery.The paper takes the master-slave model study the battery on-line monitoring experimental system.This paper,the centralized control unit as a host,and the acquisition unit as a slave,the centralized control unit is responsible for sending commands to each slave unit and receiving the message from the slave unit.Meanwhile the centralized control unit deals with the received message,and finally shows the results on the LCD screen.In terms of communication,the centralized control unit communicates with each slave unit through the RS485 protocol,makes use of button to send the message to each acquisition module,also for data viewing and some simple settings.The host computer software communicates with the centralized master unit through the network.The monitoring system can make detection of the battery voltage,battery operating temperature,battery resistance,the battery voltage and the battery pack charge and discharge current timely and accurately.The innovative parts of the monitoring system have the following points:1?Taking advantage of PSoC series chip to collect battery resistance,avoiding the traditional complex circuit design.The PSoC series chip integrates the processing technology of weak signal in a single chip,through the software programming to deal with weak signal,increasing anti-jamming capability of the resistance measurement,reducing the difficulty of the development,enhancing the measurement stability and data accuracy;2?In order to solve the shortcomings of the small current measurement error of the Hall sensor on the market,the proportional operation circuit is built by using the high precision operational amplifier device.In the precision calibration,the segmentation algorithm is used to improve the accuracy of data measurement.3?For the SOC estimation,the system draws on the finite element and normalized thinking,basing on the Kalman filter algorithm to estimate the battery SOC real time,which reducing the material,human and energy waste greatly.The results of the practice show that the monitoring modules are of high precision and good stability.The system achieves a high processing speed and a good real-time performance by the combination of hardware and software to meet the design requirements. |
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