When the capacitor is working, its internal dielectric will inevitably generate heat. The sources of this heat mainly include the charging and discharging process of the capacitor's internal charge, dielectric loss, and the heating of the equivalent resistance. As the temperature of the internal dielectric of the capacitor increases, its physical and chemical properties may change, thereby affecting the electrical performance of the capacitor. For example, excessively high temperatures may cause thermal breakdown of the dielectric material, causing the capacitor to lose its original energy storage function; or cause the capacitor shell to bulge, affecting its structural stability.

As an important component of the capacitor, the capacitor cover not only plays a role in protecting the internal dielectric, but also bears the heavy responsibility of heat dissipation. When the temperature of the internal dielectric of the capacitor rises, the temperature of the capacitor cover will also rise. This is because there is a certain heat conduction relationship between the capacitor cover and the internal dielectric. The material selection, thickness, and heat dissipation design of the capacitor cover will affect its heat dissipation effect, and then affect the temperature control of the internal dielectric of the capacitor.

In order to ensure the normal operation of the capacitor, the temperature of its internal dielectric must be controlled within a certain range. This usually requires reasonable heat dissipation design, selection of suitable capacitor cover materials, and optimization of the working environment of the capacitor to achieve. At the same time, for capacitors that work under high load for a long time, it is also necessary to regularly detect their temperature changes to promptly discover and deal with potential thermal problems.

The temperature change of the capacitor cover is closely related to the temperature of the medium inside the capacitor. In order to ensure the performance and safety of the capacitor, it is necessary to pay attention to the temperature change of the capacitor cover and take corresponding measures to control the temperature of the internal medium. Only in this way can the capacitor be ensured to play a stable energy storage role in the complex electronic equipment environment.