  Pursuing optimal power distribution in hybrid energy storage systems has
always been the goal of researchers. Here, HESS is a combination of lithium
battery and supercapacitor; this combination has been proven to effectively
compensate for some of the deficiencies of lithium batteries as an energy
system for electric vehicles. For example, the energy storage system with only
lithium batteries cannot provide high power in a short time to meet the high
acceleration performance of electric vehicles, and the excessive discharge
current will cause the temperature of the battery pack to be too high, which
will cause safety problems for the car. This paper proposes an intelligent
energy management strategy combining fuzzy controller and improved
Savitzky-Golay filter for real-time control. The simulation results show that
compared with single ESS, the maximum current of the battery proposed by the
strategy is reduced by 14.60%, and the usable cycle life of the battery is
increased by 57.31% during the test driving cycle. Meanwhile, it explores
various changes brought supercapacitor monomers in the same HESS, and predict
the next supercapacitor will bring about 31.58% reduction of volume and mass.
