First, the resistance of the pin and capacitor electrode plates is negligible because they are very small.
Two common factors that contribute to high ESR are:
1 bad electrical connection;
2 Drying of the electrolytic solution.
For 1 , both new and old electrolytic capacitors may appear;
For 2, most of them happen on old electrolytic capacitors.
The problem of poor electrical connection is mainly due to the fact that the pin leads connected inside the capacitor are not aluminum metal materials, and aluminum has always been a non-weldable material.
For the aluminum electrode plate material and the copper pin material, the electrical connection is mainly by the so-called "welding" and mechanical crimping. But both methods produce a higher ESR.
As the electrolyte moisture evaporates, the ESR also increases.
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