Dual Battery Hybrid Energy Management System Of Pure Electric Vehicle

With the energy shortage and environmental pollution problems have becomeincreasingly prominent, pure electric vehicle with energy saving, low noise, zero emissionsand other advantages in recent years has been the rapid development. The real differencebetween electric vehicles and traditional fuel vehicles in power system. Electric cars aredriven by electric vehicles, powered by the battery, the motor and its controller convertselectrical energy into mechanical energy to drive the vehicle. In the development of electricvehicles, the key technology mainly includes the battery module, motor module, controller, aswell as the lightweight car body. Among them, the development of the battery module is themost important, because it directly affects the performance of electric vehicles, cost, andsafety.As the power source, electric vehicle batteries, are key components of electric vehicles,determines the various performance of electric vehicle. Many battery types are currently inuse, such as lead-acid batteries, nickel cadmium batteries,nickel metal hydride battery. Thelead-acid battery is universal, mature technology, cheap, than the moderate energy, high ratedischarge performance is good, high and low temperature performance, so it has been widelyapplied.This paper selects the lithium ion battery and zinc air fuel cell battery hybrid powermodule parallel. According to the analysis of lithium ion battery, zinc air fuel cellcharacteristics, the superiority in performance, construct a satisfy the vehicle power, economyrequirements "zinc air fuel cell and lithium ion battery"parallel composite energy module.Through various topological structures of composite energy module of power system,propose and design a hybrid scheme of fuel cell and lithium ion battery in parallel connected.Lithium battery powered electric vehicle battery with common characteristics ofcapacitance, output power, have high low, can meet the power demand of the vehicle, but cannot meet the requirements for vehicle mileage; capacitance characteristics, zinc air fuel cellhas a higher so, these two kinds of cells can be combined, so as to improve vehicle mileage.This study focuses on the lithium battery and zinc air fuel cell combined energy module as the object, discusses the energy management strategy. Combined energy module adopts aparallel mode, the energy management strategy of lithium battery and zinc air fuel cell outputpower control, work in high efficiency area remains lithium battery and zinc air fuel cell,reduce the overall energy consumption. Research, establish management strategies using theonline optimization method, was simulated using the MATLAB software, the effective energymanagement strategy for verification of online optimization. Simulation results show that, inthe ECE40driving mode, the zinc air battery of lithium batteries to charge to the initial SOCvalue, the use of online optimal energy management strategy, zinc air fuel cell energyconsumption for331.31wh. Display the online optimal energy management strategy,efficiency can make the energy module to obtain higher,effectively reduce energyconsumption.