Alliance Intelligent Battery Series
TM
User’s Guide
© 2020 American Battery Solutions Inc. All rights reserved. The data herein is intended as a guide and does not reflect the specification range for any particular property of this
product. Such data is based upon analysis of representative samples and not the actual product shipped. We based the information on data believed to be reliable on the date
compiled, but we do not represent, warrant, or otherwise guarantee, expressly or impliedly, the merchantability, fitness for a particular purpose, freedom from patent
infringement, suitability, accuracy, reliability, or completeness of this information or the products, materials or processes described.
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Discharge Performance
Compared to lead-acid batteries, the output voltage of the Alliance Intelligent Battery
Series™ remains relatively constant across its capacity range at any given discharge
rate. As the Alliance Intelligent Battery Series™ battery discharges, limited voltage
drop translates into superior (I x V) power delivery capability. Additionally, Alliance
Intelligent Battery Series™ battery delivered capacity is nearly independent of
discharge rate. Voltage drop in the Alliance Intelligent Battery Series™ is an inverse
function of the battery internal temperature. As the internal temperature of the Alliance
Intelligent Battery Series™ drops, the impedance rises leading to an increased voltage
drop. It is important to consider the resulting performance impacts when designing a
product for cold conditions. Please contact American Battery Solutions Technical
Support to understand rate and temperature performance of Alliance Intelligent
Battery Series
TM
batteries in your application.
The Alliance Intelligent Battery Series™ battery End of Discharge (EOD) terminal
voltage is a function of the core cells, any cell-to-cell variations, and series impedance
of the internal power pathway. These elements are impacted by discharge rate and
temperature. The battery’s protection circuitry will stop discharge when any cell
voltage drops below 2.0 volts.
Cell
‐
to
‐
cell variation has the largest impact on the expected EOD terminal voltage. Cells
vary in performance in a variety of ways based on normal manufacturing. Depending on
the discharge rate, temperature, and other factors in the application, a different voltage
trigger value based on the appropriate discharge curve may be needed compared to
lead-acid or other battery chemistries. Otherwise, undesired behavior of the battery may
occur such as the unexpected loss of voltage if the Alliance Intelligent Battery Series™
enters UVP state, or taking action too soon such as disconnecting the load while
significant energy still remains in the battery.
If the intent of the application is to maximize the amount of energy available from the
Alliance Intelligent Battery Series™ battery before charging, it may be advantageous
to disable external cutoff mechanisms based on the terminal voltage and instead use
the battery’s internal protection circuitry to determine when to interrupt the discharge
cycle. The battery protects itself from unsafe conditions and typically disconnects due
to low voltage when only 5-10% of full charge capacity remains.
Balancing
Over time, the Alliance Intelligent Battery Series™ cells diverge in both capacity and
SOC. All Alliance Intelligent Battery Series™ batteries perform cell balancing at high
SOC values, based on balancing-enable conditions, to maximize the available capacity
of the battery. The balancing circuit’s purpose is to drive all cells to a balanced state.