BMU Lithium Ion Batteries, LiFePO4 Battery Management System / Units

Feature

Comments

RS-485?Communication

RS-485?Communications?is?used?to?communicate?with?the?battery?modules.?

CAN?interface

CAN?interface?will?be?used?to?communicate?with?the?host?or?the?charger.

Charge?Disconnect

When?the?battery?modules?are?fully?charged,?they?will?communicate?with?the?

BMU?and?the?BMU?has?the?ability?to?turn?off?the?charger?or?open?the?charger?

main?contactor,?interrupting?current?flow.?

Analog/Digital?

Communications

In?case?the?host?controller?doesn’t?have?a?CAN?interface,?the?BMU?

communicates?with?the?host?via?analog/digital?signals.?These?signals?include:?

Outputs?–?SOC?(A),?disable?regen(D),?early?warning(D),?BMU?fault(D)

Inputs-?12V?ignition?(D),?vehicle?fault?(D),?

Discharge?Interrupt

When?the?batteries?are?discharged?to?the?under-voltage?protection?point,?

BMU?will?attempt?to?alert?the?host?to?inhibit?discharge.?If?discharge?continues?

beyond?this?warning,?the?BMU?will?request?that?the?main?contactor?open?or?

can?open?it?itself.

Insulation?measurement

The?BMU?will?check?to?make?sure?the?battery?module?is?sufficiently?isolated?

from?the?chassis?before?and?after?the?main?contactor?is?closed.

Pre-charge?circuit

To?limit?the?inrush?current?into?the?systems?capacitors,?a?pre-charge?resistor?

is?connected?to?B+?before?the?main?contactor?is?closed.??This?also?prevents?

arcing?and?pitting?across?the?contact?tips.??The?BMU?will?close?an?auxiliary?

contactor?to?place?a?resistor?in?line?with?B+.??After?2?seconds,?the?main?line?

contactor?will?close.

Inter-module?Balancing

Compensates?slight?capacity?imbalance?between?different?batteries?when?

charging.

Intra-module?Balancing

Compensates?slight?capa