Q. Has anyone heard of NiMH cell discharge source impedance increasing when trickle charge is extended past 100% capacity?
A. When 100% charge, lots of gassing takes place in NiMH active mass pores. This gas is adsorbed on the surface inside the pores, and as the results the real active surface of the electrode mass is decreased temporary (until this gas is recombinated during several hours after charging is stopped). Additionally the electrolyte is "pushed away" - pores are "temporary dried". Both these events increase the impedance.
Unlike NiMH, in Ni-Co gassing does not appear until 93% of the battery capacity when charging by > then 2C (takes less than 30 minutes). If the rest 7% to full capacity is charged by 0.1C, then no gassing is released.
Q. What is the thermal behavior of your cell in the end of charge phase?
A. There is no thermal behavior even at the end of charging cycle, since the internal resistance is very low.
Q. How the cell react to an overcharging situation?
A. There is no need for overcharging. Our max charge input is 101-102% if charging is conducted in two stages (93% +7% in low charge current)
Q.
A. When 100% charge, lots of gassing takes place in NiMH active mass pores. This gas is adsorbed on the surface inside the pores, and as the results the real active surface of the electrode mass is decreased temporary (until this gas is recombinated during several hours after charging is stopped). Additionally the electrolyte is "pushed away" - pores are "temporary dried". Both these events increase the impedance.
Unlike NiMH, in Ni-Co gassing does not appear until 93% of the battery capacity when charging by > then 2C (takes less than 30 minutes). If the rest 7% to full capacity is charged by 0.1C, then no gassing is released.
Q. What is the thermal behavior of your cell in the end of charge phase?
A. There is no thermal behavior even at the end of charging cycle, since the internal resistance is very low.
Q. How the cell react to an overcharging situation?
A. There is no need for overcharging. Our max charge input is 101-102% if charging is conducted in two stages (93% +7% in low charge current)
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