SEALED ENERGY SYSTEMS
®
20
User Manual
3.4.3. Discharge Protection
Under-Voltage:
The primary protection circuit will prevent the battery from
being further discharged once any cell voltage reaches
<=2900mV. Then, once all cell voltages are >= 3150mV, it
will allow discharge again.
Over-temp:
The primary protection circuit also provides over-
temperature protection and will prevent the battery from
discharging at temperatures =>75ºC. Then, once the battery
temperature has cooled to <=65ºC, it will again allow
discharging.
If the battery reaches 85ºC for any reason the secondary
protection circuit will blow the in-line power path logic fuse.
The fuse is non-re-settable rendering the battery pack non-
functional.
Over-Current:
The primary protection circuit also provides continuous over-
current protection and will prevent the battery from
discharging at Current()<=6.0A. Then, Once the Average
Current() >= -200mA for 70sec, the battery will re-test the
over-current condition, and again allow discharging.
3.4.4. Short Circuit Protection
The primary protection circuit will prohibit the discharge of
the battery if a short-circuit is placed across the / -
terminals. Then, once the Average Current() >= -1mA for
70sec, the battery will re-test the short-circuit condition, and
again allow discharging.
The pack is design to withstand reasonable in-rush currents
without resetting the electronics and without interrupting
the discharge cycle. The following graph illustrates the short-
circuit/in-rush set points as implemented:
