Abstract:

Effect of overload on the performance of power-type electric double-layered capacitors used for trams is studied via overcurrent, overvoltage, short-circuit discharge, and high- and low-temperature tests. The results show that the electrochemical properties of electric double-layered capacitor cells remain consistent after cycling at the same charging and discharging current. When average current is greater than rated current, a cell produces more heat than usual, which can easily cause electrolyte leakage. The cell can be discharged at a short-circuit current without damage while the instantaneous short-circuit discharge current is 6200 A. The cell shell bursts and burns after charging for 1000 s at the rated current, but the burning phenomenon is quickly extinguished after charging is stopped. Continuous combustion does not occur and the cell does not explode. The high withstand voltage of the cell is 3.0 V. The monomers can be used in the temperature range of -45 ℃ to approximately 65 ℃. As temperature decreases (≥-45 ℃), the performance of a cell improves.

Key words: electric double-layer capacitor, over voltage, over current, short circuit