BEU8637-08 Datasheet, PDF (1/9 Pages) Aeroflex Circuit Technology – Independent Balancing for Two 8-Cell Batteries Cell Voltage Monitoring and Telemetry

Cell Management Electronics for Lithium-Ion Battery
BEU8637-08
Independent Balancing for Two 8-Cell Batteries
Cell Voltage Monitoring and Telemetry
www.aeroflex.com/BEU
March 21, 2008
Description
The Aeroflex 8637-08 is a Lithium-Ion cell
balancing system. It controls the balancing
of one or two batteries, each consisting of
a series stack of Lithium-Ion cells to ensure
that each cell is precisely charged to its
proper level of energy and to monitor each
cell's operational voltage.
The cell balancing circuitry uses a set of
bilateral DC-DC converters which tie each
cell of a battery to a common share bus.
Cell charge is distributed among the
multiple cells so that the charge of each
cell is automatically matched to the
average charge of the other cells.
Features
● _{Cell Balancing to within ±5.0mV}
● _{Cell Voltage Monitoring Accuracy}
±10.0mV (±20.0mV Space Mission Life)
● _{Total Battery Voltage Monitoring}
Accuracy ±0.3% of Full Scale
● _{Supports up to 8 Lithium-Ion battery cells}
in series per stack
● _{Battery Drain Current at Balance}
15mA Max for each 8 cell stack
● _{Discrete output lines for critical signaling}
with user definable thresholds:
Overvoltage Protection 4.40V typ
Cell Voltage High
4.20V typ
Cell Voltage Low
3.20V typ
● _{MIL-STD-1553B telemetry for data}
logging and monitoring
SCD8637-08 Rev A
Safety
The safety of Lithium-Ion battery
technology requires that extreme care be
taken in the provisions made for cell
charging and cell monitoring.
Precision measurements of each of the
individual cell voltages in the battery stack
and precise charge balancing to each
individual cell are critical.
The Aeroflex 8637-08 provides the
necessary precision of control and
monitoring to ensure that safety.
Discrete logic outputs are provided for
critical signaling, enabling the user to
initiate load shedding and/or to halt
charging.
Low operating losses enable continuous
operation. Continuous balancing provides
maximum protection against any one cell
becoming overcharged.