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7.2 Battery Management System
7.2.1 Battery Management System Protections
The Battery Management System's (BMS) primary function is to monitor cell
module voltage, temperature, and battery current. The BMS uses this information to
maintain cell operation within operating specifications. If a parameter falls outside
of operating specifications, the BMS will disconnect and protect the battery from:
1. Overvoltage: Charge voltages that are too high.
2. Undervoltage: Discharged voltage that is too low.
3. Overcurrent: Current is too high when powering up a load (high inrush current)
or from a sustained charging or discharging current above the specified limit.
4. Over-temperature: Cell temperature that is too high during charge and discharge.
5. Under-temperature: Cell temperature that is too low during charge and
discharge.
For trigger and recovery values, refer to Table 3-4, AES LiFePO
Specifications.
The BMS reconnects when it hits recovery thresholds. Manually switch the battery
ON if the BMS disconnects due to low voltage protection. A physical disconnect
switch is recommended to reconnect the battery if the system has a constant
parasitic draw.
• Charge and discharge have different operating temperature limits.
• If the BMS disconnects in response to temperature or current limits, wait for the
temperature or current to reach normal operating limits before switching the battery
ON.
7.2.2 Battery Management System Pre-Charge System
The battery has a Pre-Charge System to energize external capacitive loads before
switching the main relay ON. The maximum input capacitance for a single battery
should not exceed the values in Table 3-1, AES LiFePO
• When switching ON batteries, the inrush current may cause the batteries to fault as
they energize external capacitive loads. To resolve this, switch the batteries ON again.
7.2.3 Battery Charge and Discharge Settings
In an open-loop configuration, use the specifications provided in this manual to set
up the charge and discharge settings manually at the time of installation through
the controller of the Power Conversion device. This system contrasts with a closed-
loop configuration where the BMS specifies charging and safety settings through a
connection with the Power Conversion device.
NOTE
4
NOTICE
12
Protection
4
Electrical Specifications.
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