| Ship pollution has become the third largest source of air pollution in our country,after the vehicle exhaust and industrial emissions.So in recent years,people have been committed to study the green ships,to replace the traditional diesel engine ships.The island electric boat with the power of lithium-ion battery pack has no noise and emissions during sailing,it gets great concern of many ship manufacturers.However,the ship load and it's work voltage fluctuation is large,in order to ensure the safe operation of the ship's power battery,it must be managed when it works.So the study of battery management system(BMS)is meaningful to promote the development of electric ships.By comparing the application status and technical points of electric car BMS and ship BMS,pointed out that ship BMS has put forward higher requirements in the two key technologies of SOC estimation and balanced management.By consulting a large number of documents,based on the existing theory,a composite SOC estimation method based on open circuit voltage method and an integral method is proposed.Also an inductive and capacitance combined active equalization scheme is proposed.And the simulation experiments were carried out respectively.Then on this basis,design the hardware and software of the ship BMS.On the hardware,use STM32F103ZET6 as the main control chip,designed the power circuit,data acquisition circuit,CAN communication circuit and information storage circuit.On the software,use modular programming,write the main and each subroutine program flow in the development environment of Keil MDK.Upon all these works,BMS prototype production were completed and the test result shows that the designed BMS fulfill the requirements. |
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