BEU8640-24 Datasheet, PDF (1/10 Pages) Aeroflex Circuit Technology – Dual Redundant Balancing for 24-Cell Battery Cell Voltage Monitoring and Telemetry Reconditioning Load Control Cell Bypass Relay Drivers

Cell Management Electronics for Lithium-Ion Battery
BEU8640-24
Dual Redundant Balancing for 24-Cell Battery
Cell Voltage Monitoring and Telemetry
Reconditioning Load Control
Cell Bypass Relay Drivers
www.aeroflex.com/BEU
October 5, 2007
Description
The Aeroflex 8640-24 is a Lithium-Ion cell
balancing system. It controls the balancing
of one battery 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 the 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 24 Lithium-Ion battery cells}
in series
● _{Battery Drain Current at Balance}
15mA Max for 24 cell stack
● _{Discrete output lines for critical signaling}
with user definable thresholds:
Overvoltage Protection 4.40V typ
Cell Voltage High
Cell Voltage Low
4.20V typ
3.20V typ
● _{MIL-STD-1553B telemetry for data logging}
and monitoring
● _{Dual redundant control and cell balancing}
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 8640-24 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.
SCD8640 Rev C 10/5/2007