Research on developing method of low-temperature resistant liquid aluminum electrolytic capacitor
Electronic components with broader operation temperature is an inevitable trend. To ensure the controllability of low-temperature performance of aluminum electrolytic capacitors, the correlation between capacitance ratio αxx and electrolyte's conductivity σxx at low temperature was established by meticulously scrutinizing the capacitor's equivalent circuit model. And the correlation was validated by a series of carefully designed experiments. The results show that when the capacitor materials are well matched with the working electrolyte, the calculation error between the actual conductivity (σmeasured value ) and the estimated conductivity (σcalculated value ) is ～5％ when the capacitor is required to meet a certain capacity ratio at low temperature, indicating that the correlation between αxx and σxx is of great value. Based on the results, the developing method of low-temperature aluminum electrolytic capacitors is as follows: ( 1) select the matched materials and working electrolyte to make a capacitor; ( 2) test and calculate the corresponding parameters; ( 3) the required conductivity (σcalculated value ) is estimated based on the above correlation; ( 4 ) a new electrolyte is obtained by improving the low-temperature conductivity to a certain value; ( 5 ) the capacitor can be made to meet low-temperature requirement by combining the matched materials with the new electrolyte.
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