关键词: 超级电容器, 循环工况, 仿真, 热管理

Abstract:

During charging and discharging, a supercapacitor used for energy storage generates heat owing to internal resistance, which increases the internal temperature of the capacitor. If temperature inside a supercapacitor is very high, the capacitor's performance deteriorates, cycle life reduces, and electrolyte evaporates and damages the capacitor. This study simulates the charging and discharging processes of a supercapacitor module (single series 40 A charge/519.5 A discharge) and obtains temperature distribution inside the capacitor and the welding point between the supercapacitor terminal and aluminum bar and between the aluminum bar and whole module under natural cooling at 25 °C using Fluent. A heat generation model of the supercapacitor module is established to simulate its heat generation and heat generation rate under cycle conditions, which provides a basis for research on thermal management systems of supercapacitor modules.

Key words: supercapacitor, cyclic conditions, simulation, heat dissipation