Research On Regenerating Energy Storage System Of Pure Electric Vehicle

The road condition in China is characterized by numerousness as well as steepness of slope because the mountainous area in China accounts for 69% of China's total territory and some of the city's landforms are also boasting special features.Regarding the problems of insufficient braking energy recovery when going downhill and poor auxiliary acceleration performance of energy storage device at the time of upslope,energy storage programs and corresponding regeneration control strategy are employed to work out a regenerative braking storage program of a pure electric vehicle.It can reserve as much energy as possible so as to advance the rate of energy recovery when taking a long downhill and maintain its climbing performance when taking a long upslope,thus finding a solution to the problem of slope driving of PEV.This paper,based on the researches on the regenerative braking energy storage system of pure electric vehicle,tremendous effort of analysis and comparison along with simulation experiment was made to verify both advantages and disadvantages of various energy storage program.Energy storage program of the lithium-ion battery,hydraulic accumulator and super-capacitor with its corresponding controlling strategy of regenerative breaking was worked out.Thus,the acceleration performance of the regenerative braking energy storage system on the PEV will be upgraded,and the energy consumption will be diminished,the endurance mileage Per Charge and the battery life will be prolonged when experiencing a long downhill or uphill driving.In this paper,based on vehicle dynamics analysis and the analysis of the dynamic performance,the author completes the parameter design of the energy storing device of the lithium-ion battery pack,super capacitor pack,hydraulic accumulator as well as the secondary component.As a result,three significant modes of the power transmission system,accumulation system and controlling strategy of regenerative braking are built.Finally,simulation testing is made based on ADVISOR2002.The test results show that the energy storage scheme of lithium-ion battery – hydraulic accumulator – super capacitor energy storage is superior to the mainstream composite energy storage in terms of climbing performance,acceleration performance,braking recovery efficiency,driving range and other aspects,meeting the design requirements.