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7 Technical description
The advanced LiFePO4 battery offers the desired features like charging below freez-
ing, series connected batteries as well as BLE and CANBUS connectivity. The battery is
equipped with a Battery Management System (BMS) that is built in the battery housing.
The battery management system is a non-power consuming, passive electronic device
that protects the battery against deep discharging, overcharging, over-temperature,
and ensures cellbalancing of all serial switched blocks during charging. The battery has
the following features:
Communication ports
The two connectors are for inter-battery communication for parallel and series connect-
ing batteries.
Reserve capacity
Reserve capacity of 5 % is provided to allow users to perform emergency actions with
the battery even when it is completely discharged. This is accomplished by disconnect-
ing the battery before the battery is completely discharged.
Power button
Button with LED for indicating and controlling the power mode of the battery.
This button allows transition between the following modes:
Mode
LED Function
ON
LED is lit
OFF
LED is off
Sleep
LED is slowly flashing
Re-
LED is slowly flashing
serve
Heater
There is a heater inside the battery on the bottom side of the cells. This heater is con-
trolled by the BMS and allows the battery to be charged at ambient temperatures as
low as -20 °C. The BMS implement three modes for heater control.
Mode
Heater function
Auto
The heater is always on when battery is in sleep mode and always off when
battery is in OFF mode. When battery is in ON mode the heater will on-
ly turn on when a charging source, that is capable of fully powering the
heater, is available.
ON
The heater always turns on when the battery's internal temperature is below
2 °C and it stays on until the battery internal temperature is above 7 °C.
OFF
The heater is always off.
Capacitor pre-charge
The pre-charge and pre-discharge circuit in the BMS allows large capacity banks to be
charged prior to connecting the cells. This avoids damaging inrush currents.
Fault recovery
If the BMS disconnects the battery due to a fault, it will reset automatically when the
conditions return to normal.
For low voltage disconnect, the BMS shall allow up to 10 A of current to be drawn from
the battery.
Battery Function
Battery charge and discharge paths are both
enabled and BMS power is on (BLE and CAN-
BUS both active)
Battery charge and discharge paths are both
disabled and BMS power is off (BLE and CAN-
BUS both inactive)
Battery charge path is enabled but discharge
path is disabled and BMS power is on (BLE
and CANBUS both active)
Battery charge path is enabled but discharge
path is disabled and BMS power is on (BLE
and CANBUS both active)
Components
The 100 Ah battery has the following components:
1
Battery Connections
2
Slanted sides prevent batteries from being installed without an air gap between them
for cooling
3
Integrated screw holes for easy mounting. This works well for width limited enclosures
4
Communications ports (CANBUS)
5
Power button with status LED
6
Staggered terminals allow parallel/series connections without much wire interference
The 300 Ah battery has the following components:
1
Battery Connections
2
Handle clips in to keep it from flopping around
3
Power button with status LED
3
Integrated screw holes for easy mounting
Easy mounting works well for width limited enclosures.
4
Communication ports (CANBUS)
5
Power button with status LED
6
Staggered terminals allow parallel/series connections without much wire interference
7
Optional brackets for easy mounting to a wall
EN
5
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