Battery impedance is the resistance when the current follow through an operating cell, in general the internal resistance is included both d.c and a.c resistance. For the rechargeable battery resistance is small and electrode is easy to be polarized along with producing a resistance can avoid the inflection of polarization, so accurate value will be gained more easily.
A cell is equivalent to a resourceful resistance, thus characteristic can be used as the measurement approach. If a cell is connected with a 1000Hz and 50Ma constant current while series actions are taken such as sampling its voltage, commutating and filtering wave, its impedance value can be gained accurately. |
