Electrochemical capacitor thermal management issues at high-rate cycling

摘要: Abstract Electrochemical capacitors have attractive performance features for gas-electric hybrid vehicle applications, namely high-power density and essentially unlimited cycle life. A capacitor system can efficiently capture store the 5–10 s of braking energy generated during stopping then release it subsequent acceleration. Even with their exceptional power performance, these types less than 100% efficiency—some is always lost as heat. Thus, high-rate cycling electrochemical may create thermal management problems, magnitude increasing rate. This paper examines loss undergoing periodic constant-current charge/discharge from one-half rated voltage to voltage. Cycle efficiencies five commercial, large-cell are reported a function rate compared series- RC equivalent circuit model results. Three were well represented by such simple good correlation over span covering almost two orders times. The other not this model, which was due substantially greater porous electrode behavior. Consequently, appears adequate investigating issues some, but all large ECs demonstrates that caution needed when selecting electrical models perform engineering.