Proper Operation of A123Racing Hypersonic Developer Kit
Summary usage and care guidelines
Handling Precautions
•
CAUTION - do not short circuit; these cells are capable very high discharge currents.
•
DO NOT rotate the negative tab (cap) relative to the can, this can cause internal damage to
the cell.
•
Note that the can is the positive terminal and the cap is the negative terminal (see diagram
at right).
Specification
Nominal voltage
3.3V
Nominal capacity
2.3Ah
Nominal dimensions
26mm ø x 66.5mm ht.
Nominal cell weight
70g
Cell charging parameters: CC-CV (constant current – constant voltage)
Recommended charge current (0°C to 60°C ambient temp):
3A
Recommended charge voltage:
3.6V
Recommended float charge voltage:
3.45V
Recommended cut-off current for CV hold (indicating 100% SOC):
0.05A
Maximum continuous charge current (20°C to 60°C ambient):
10A
Maximum allowable charge voltage:
4.2V MAX
Fast charge time:
15 minutes
Cell discharging parameters (-30°C to +60°C ambient temperature)
Recommended discharge cut-off voltage:
2.0V
Maximum continuous discharge current:
60A
Cell temperature parameters (skin temperature)
Maximum recommended cell temperature:
70°C
Maximum allowable cell temperature:
85°C
Allowable storage temperature range:
-50°C to +60°C
Recommended charge method: CC-CV
Recommended float charge method
If the voltage of the cell is to be held at the charge voltage (after reaching 100% state of charge) for prolonged periods of time,
the charge voltage should be lowered to the recommended float-charge voltage.
Recommended fast charge method
Charge the cell at the maximum continuous charge current untill the maximum recommended charge voltage is reached. Apply
a constant voltage hold at the maximum recommended cell voltage untill the total charge time reaches the fast charge time. The
cell will be charged to over 96% SOC. Fast charge should not be attempted outside the recommended temperature range and
should be stopped if the cell exceeds the maximum allowable cell temperature.
Recommended discharge method
For optimum life, the cell should not be continuously discharged faster than the maximum cell continuous discharge current or
allowed to self heat greater than the maximum recommended cell temperature. Operation above the max recommended cell
temperature will result in degraded cell performance and life. Discharge should be stopped when the cell reaches the maximum
allowable cell temperature. Operation above the maximum allowable cell temperature will result in physical damage to the cell.
At low temperatures the maximum available discharge current will decrease.
The cell can be discharged at greater than the maximum continuous discharge current in pulses, but the cell should not be allowed
to exceed the maximum allowable cell temperature. During pulse discharges the cell voltage can safely fall below 2V per cell.
Although it is safe to discharge the cell below the recommended discharge cut-off voltage, the cell should not be left at this level.
CAP
CAN
Before joining cells together please read the below instructions:
Cells are shipped at 50% state of charge (SOC). All cells that are being joined together within the same string must be at the
same SOC. If not, the string will be unbalanced and cell damage and/or reduced capacity may result. If the SOC of the cells are
not known, the best way to be sure a string is balanced is to individually charge each cell to 100% SOC before building them into
strings.
The cell should be charged at the recommended charge current until the normal charge voltage is reached. Apply a constant
voltage hold at the recommended charge voltage until the cut-off current for CV hold is reached (or 30 minutes, whichever
comes first). The cell will be charged to 100% SOC.
A123 Racing - 116 South St. Hopkinton, Ma 01748
The Racing Components Division of A123 Systems
