For lithium-breed batteries, the
fragility and sensitivity upon terminal voltage,
high-temperature environment or too high current
are all harmful. Consequently, versatile protecting
circuits are requisites for lithium batteries.
Furthermore, for high voltage applications, seriesconnected
battery string is a normally adopted as
the power source. In a lithium-battery string,
every single battery unit should be protected as
fore-mentioned. This paper is aimed to carry out a
protection system for ten series-connected lithium
batteries. This power system is kernelled with a
Microchip-based dsPIC controller. Together with
associated detecting circuit, the controller can
perform protection functions for preventing
hazards such as over-voltage, under-voltage, overtemperature
and over-current.