| Energy crisis and air pollution make certain restrictions to the development of fuel car. People pay more and more attention to the clean and light transport. Electric bus is a good choice for a city trip. And the energy storage of lithium battery is widely used in electric cars, because of its characteristics, such as high energy, long life, high rated voltage, light weight and a low self-discharge rate. But when the lithium battery's management is poor, there could be a danger. Therefore, the bus lithium battery management system is designed to solve the preceding problem.A real-time online monitoring system is designed by using the information sensing and Internet technology, based on the analysis of the development status about monitoring technology for electric bus lithium battery, combined with the characteristics of lithium battery for electric bus. The system samples the parameters of monomer lithium battery through the DS2438. And communication between the modules and automotive main console by single bus is realized. The data is sent to single chip microcomputer MSP430G2553 for processing, using switched capacitor equalization to avoid the monomer battery over-charging or under-charging. The management of a bus lithium battery is completed with the single chip microcomputer MSP430G2553 as the core. The system can estimate the remaining battery capacity (SOC). And a real time monitoring and management system for single body lithium battery is realized. A real-time network monitoring terminal is designed, obtaining the historical data and operating conditions of online buses' lithium battery through the GPRS wireless network, which can provide basis of decision making for buses' unified scheduling, maintenance and replacement. The results of the test show that the intelligent monitoring system for the bus lithium battery can meet the design requirements. It can improve the service life and safety of the battery. Its engineering needs to be further studied. |
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