I+ME ACTIA BMS Master 4 - Connection of External Balance Resistors

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Hardware Manual

BMS Master 4 / 4.5

Ref.: IR14417 A 15.01.2018 Page 66/76

Modul

Balance current

cell type

Slave 6 A 2X

20,5 Ohm

U [mV]: 1500 … 2800

I [mA]: 73 … 137

Cell type: LTO cell

Slave 6 A 3X

27,5 Ohm

U [mV]: 2500 … 3600

I [mA]: 91 … 131

Cell type: LFP cell

Slave 6 A 4X

37,5 Ohm

U [mV]: 2800 … 4200

I [mA]: 75 … 112

Cell type: NCA cell

The resistor values are adapted on the voltage range of the cell voltages. Thus an

optimum between maximum balance current and maximum board temperature is reached.

View of a Balance module to connect on the ANA module:

3.6.9.1 CONNECTION OF EXTERNAL BALANCE RESISTORS

All resistor respective cell connections are connected to a 24 pole MicroFit connector. At

this connector it is possible to connect external balance resistors to use higher balance

current max. 600mA. External resistors can be connected of 2 ways.

 One connection direct at the cell, one connection with a separate wire at the 24

pole connector.

 With 2 wires at the 24 pole connector

The cell voltage connections of the 12 pole connector must not use for the external

balance resistors. Wire gauge should be minimum 0.5 mm².

Resistor value is set depending to cell type, so that the balance current lower than