Electrical
Design
Li-ion or Li-Po cells cannot be used
directly in electronic device. They have to be and assembled with
a PCM (protection circuit module) and other components of different
devices. Sometimes the more complex designs such as smart battery
pack may use integrated PCM and BMS (battery management system)
which provides the advanced functions such as fuel gauge calculations,
protection, cell balancing, thermal sensing, statues indicating
lights and serial communications buses.
PCM works as safety devices and it protects
the cells against over charging/ discharging, over current, short
circuit, over heat and etc. Li-ion/li-po batteries must be used
within the operation ranges of 2.75V min. to 4.2V max. Otherwise
they should be damaged permanently and can’t be used again.
It has following functions:
1) Overcharge voltage protection.
2) Over discharge voltage protection.
3) Over-current protection.
4) Short circuit protection.
5) Battery high temperature protection.
6) Battery's internal pressure increase protection.
BMS is a protection, control and management
system to monitor the battery status in order to protect the cells
from damage, generate alarms, keep the application work normally
and prolong the battery’s service life. It has the major
function as follows.
1) All PCM protection functions
2) Measurement of voltage, current, capacity, temperature
3) Charging control
4) Cell monitoring and balancing
5) Communication interface with application
At Creup no matter what your application
requirements, from basic PCM design to advanced smart battery
management system, we are able to deliver. |
