Ray Minich
From:
Bradford, Pa. Frozen Tundra
|
Posted 5 Jun 2008 6:37 am |
|
Here's some notes I stumbled upon regarding the peculiarities of this battery chemistry...
Complex Charge Requirements:
By virtue of the battery they are designed to charge, Li-ion battery chargers are more complex and accurate electronic power systems than chargers used for other battery types. A Li-ion battery needs a different type of charging process than other battery technologies, the CC in a first phase transitioning to the CV in the second phase.
A Li-ion battery also has unique requirements for charge process termination, which involves sensing that the battery has reached its full charge and that the charger must be disconnected or shut down. This is done by detecting, while in the CV phase, the point where the charge current is reduced to a small fraction (usually <10%) of the so-called fast-charge or maximum charge current.
Li-ion is also more delicate than other battery chemistries, with little tolerance for abuse. In addition, this chemistry demands high accuracy for the battery-charger current and voltage settings. Failure to provide the required accuracy can result in a severe reduction in battery life, failure to reach a complete charge and other degradations in battery performance.
The full text can be read at:
http://powerelectronics.com/portable_power_management/battery_charger_ics/power_battery_emulation_circuit/ |
|
