The service life of aluminum electrolytic capacitor is related to the working environment of the capacitor. If a capacitance of - 40~105 ℃ and 5000 hours, the so-called 5000 hours means that the service life is 5000H under the working environment of 105 ℃. When the temperature of the working environment is reduced by 10 degrees, the service life is doubled. vice versa.

　　The service life of aluminum electrolytic capacitor varies with the change of service temperature. Generally, the service life of aluminum electrolytic capacitor increases by two times when the service life decreases by 10 ℃ under the maximum guaranteed temperature (above 40 ℃), which is determined by the difference in the speed of the electrolyte volatilizing outward through the sealing material as the temperature changes.

　　LT=L * 2 ^ (T-T0)/10 LT=actual service life L=guaranteed service life T=maximum service temperature T0=actual service temperature;

　　If the ambient temperature is too high, which exceeds the maximum rated temperature of the electrolytic capacitor, it will cause the electrolyte boiling in the electrolytic capacitor to produce overpressure, and the pressure relief components will produce irreversible pressure relief action to form electrolyte leakage, which will cause permanent damage to the electrolytic capacitor. Therefore, the storage and operation temperature of electrolytic capacitor must not exceed the rated temperature.

　　Other elements:

　　The service life of aluminum electrolytic capacitor is not only related to the ambient temperature, but also related to the ripple current.

　　Because thermal stress has a decisive impact on the service life of electrolytic capacitors, the heat loss caused by ripple current is an important factor affecting the service life of electrolytic capacitors.

　　Ripple current refers to the AC weight current flowing through the electrolytic capacitor. It is affected by the ambient temperature and AC frequency. The maximum allowable value of ripple current varies with the ambient temperature. When the ambient temperature is constant, within the allowable range, the larger the ripple current flowing, the shorter the service life of the electrolytic capacitor.