CellShield is a low voltage cutoff
device which provides cell-by-cell protection for lithium battery
packs. By monitoring each cell individually, CellShield prevents
individual cell overdischarge due to pack imbalance or cell variations.
CellShield provides a soft cutoff when the lowest voltage cell of the
pack reaches the set minimum voltage. The minimum voltage is adjustable
from 2.5v/cell to 3.5v/cell. This lets you set the proper cutoff
voltage for your specific pack. For example, 8-10C cells typically use
a 3.0v/cell cutoff, while 20C cells work better with a 3.2v/cell
cutoff. CellShield’s cutoff voltage is set with an easy-to-use
potentiometer. There are no programmers to buy or complicated
programming procedures. With CellShield, you turn the arrow to the
cutoff voltage you want and go fly.
CellShield also features optional thermal probes, which prevent pack
damage due to overheating. When using the thermal probe, if the battery
temperature rises above 150 degrees, CellShield will reduce the
throttle command sent to the ESC in an attempt to bring the battery
temperature back down. If the battery stays above 150 degrees,
CellShield will enter soft cutoff mode. When using the thermal probe,
CellShield alerts the user to temperature faults by flashing the red
Temp light. The thermal probes are extremely thin, and can often be
inserted between the innermost cells of the pack, where pack
temperature is highest.
CellShield installs easily between your receiver and ESC. Simply plug
the battery port on the CellShield into the tap connection on your
battery, and it will automatically detect the number and cell order for
any pack with .1” tap spacing. If you are running a battery with 2mm
tap spacing like Thunderpower, a 2mm to .1” adapter is all that is
required to use CellShield. Suitable
Thunderpower adapters can be found here. CellShield will then
light an LED corresponding to the detected cell. You can even
plug the battery tap in “backwards” and in any position, and CellShield
will operate correctly. No soldering is required to install CellShield.
CellShield works with any ESC and power system except some
opto-isolated ESCs when used with receiver batteries. For cell-shield
to operate, the battery ground and radio ground must be at the same
level. This is the case for all ESCs with a built in BEC (whether or
not the ESC’s BEC is being used) and all ESCs using external BECs.
For a solution that works with a wider voltage range, check out
CellShield is intended for aircraft with 0-100% style one
direction only throttle. A future product will be aimed at cars.