LIBAL S-BMS™SCALABLE BATTERY MANAGEMENT SYSTEM

Product Presentation

CONFIDENTIAL1

System overview

Local Monitoring Unit (LMU)• Monitors up to 8 cells in series• Two temperature sensors• Market leading balancing performance

(800mA/cell)• Automatic sleep mode• Autonomous balancing• Up to 32 LMU’s can be connected for a

total of 256 cells• Stand by current consumption > 1mA

Battery Management Control Unit (BMCU)• Pack voltage monitoring up to 1000V• Pack current measurement up to 2000A• Contactor control• CAN bus• Diagnostic interface• Isolation fault detection• Charger control

1. BMCU2 LMU 3. BATTRY PACK / Cells4. SHUNT5. HV+ MAIN CONTACTOR6. Charger7. SOC DISPLAY 8. DIAGNOSTIC TOOL

HV +HV –CELL MONITORINGTEMPERATURE MONITORING

RS 232RS 485INPUT SIGNALSOUTPUT SIGNALS

80%

SoC

80%

SoC

80%

SoC

80%

SoC

1

2

3

8

Basic System < 60V

Charger

Load

4

76

5

1. BMCU2.1 LMU 12.2 LMU 23. BATTRY PACK4. SHUNT5. CHARGE CONTACTOR6. HV- MAIN CONTACTOR7. HV+ MAIN CONTACTOR8. PRE CHARGE CONTACTOR9. CHARGER ( CAN or PWM or

ANG)10. CAN DISPLAY 11. DIAGNOSTIC TOOL

HV +HV –CELL MONITORINGTEMPERATURE MONITORINGCANRS 232RS 485INPUT SIGNALSOUTPUT SIGNALSKEY SWITCH

80%

SoC

80%

SoC

80%

SoC

80%

SoC

80%

SoC

80%

SoC

80%

SoC

80%

SoC

Resistor

VCU

1

2.1

34

5

9

6

7

8

1011

2.2 12 V

Basic System >60V

Electromagnetic immunity

CONFIDENTIAL5

Noise source Immunity

Radiated noise affectingboard directly

6 layer print with ground planes isolating all routing

Radiated noise on communication wires

Fully differential, optically isolated communications bus. Passive noise filtering on communications bus

Conducted noise on cell monitoring wires

Passive noise filtering on all inputs

Noise on 12V power supply

Passive noise filtering on input and output from all power supplies

Electrostatic shock Capacitive filtering to ground on all inputs

Vibration stability

CONFIDENTIAL6

• 6 mounting positions per board

• Tried and tested in the roughest possible operating conditions

• HALT tested to show high level of vibration stability

Temperature range

CONFIDENTIAL7

• All components have industrial specifications

• Real-life tested in 24/7 cold store application

• HALT tested to show stability between -90⁰C and 120 ⁰C

Functional safety

CONFIDENTIAL

• Risk assessment in accordance with 2006/42/EC Machinery directive

• Risk mitigation and contingency plans identified and implemented for all identified risks.

• Compliant with;– 2004/108/EC Electromagnetic Compatibility directive– 2006/95/EC Low Voltage Equipment directive– 2006/42/EC Machinery directive

• Monitoring of all safety parameters in real time including;– Cell voltages– Cell temperatures– Board temperatures– Current– Isolation between high voltage system and 12V system– Contactor status – 12V supply

• Galvanic isolation between high voltage and 12V on all boards

State-of-Charge (SOC) calculation

• Fudamental principle is Coloumb counting using the highprecision current measurement

• The Coloumb counter is reset every time the battery is fullycharged and balanced (SOC=100%)

• The Coloumb counter can be enhanced by the battery model to compensate for temperature and rate of discharge effects.

Charger control

Bulk charge phase

Balancing phase

Cell voltages rapidly

converging towards the

target voltage

Voltage monitoring

CONFIDENTIAL11

Cell voltage settings in Diagnostic Software

• High resolution cell voltage measurements (1mV resolution)

• Calibration of cell voltages to remove voltage drop in measurement wires (gives 1mV accuracy at room temperature)

• Measures each cell voltage in the pack every second

• Battery chemistry specific settings as configuration in Diagnostic Software.

Current monitoring

CONFIDENTIAL12

• High resolution current measurement (0.1A resolution)

• Calibrated measurement shunt (Class 1 or 0.5)• Auto calibrated measurement input circuit• Calibration for linearity faults and offset errors gives

0.1A accuracy at room temperature.

Max discharge current settings in Diagnostic Software

Temperature monitoring

CONFIDENTIAL13

• 4 temperature sensors per LMU board

• Noise robust passive sensors

• Auto calibrated inputs

Advance temperature settings in Diagnostic Software

System level temperature settings in Diagnostic Software

State-of-Health (SOH) monitoring

CONFIDENTIAL14

• Measures capacity based State of Health (SOH) each full discharge cycle

• Continuously measures pack resistance• Measures cell resistance each charge cycle

Cell resistances in Diagnostic Software

I/O ports

CONFIDENTIAL15

The BMCU supports 8 general purpose I/O ports

• 5 ports are pre-allocated to defined functions

• 3 ports can be configured on a per-project basis

I/O monitor in Diagnostic Software

I/O configuration in Diagnostic Software

CAN bus

CONFIDENTIAL16

• Interface to vehicle control units, chargers, displays etc.

• Configurable speed from 125kbit/s up to 1Mbit/s• Configurable to run 11 or 29 bit identifiers• Fully flexible CAN frames that can broadcast any

BMS parameters with bit level control of data alignment

• Post processing functions that allows dynamic re-scaling and arithmetic operations on BMS parameters

Robust and Reliablein real life operations

• Warehouse systems > 1000 units in 24/7 operation

• Street sweepers and Garbage trucks; IP69K rated in more than 700 systems since 2011

• Jammer systems 24V, that withstand telecom Jamming signals

• Coldstore Material handling in -23°C, 24/7 operation in more than 4 years, without any service issues

• Truck mounted forklifts on the road deliveries down to -5°C

• On the road vehicles in total >5.000.000 km

CONFIDENTIAL17

Features and benefits

Feature Benefits

Universal Standard, off-the-shelf product.

Can be applied with all types of Li-Ion

chemistries and cell types.

No need to redesign own system, i.e. cost

savings.

Possibility to have multiple battery options for

different customer type and usage

Flexible The system can be easily configured to

customer-specific application and

settings.

No need to reengineer hardware or

software to support new applications

Low risk of implementation and deployment.

Go safely to market.

Possibility to tailor the solution to specific

neeeds of the end-customer. Ensuring

right/desired performance.

Strong

balancing

capability

A high balancing performance (up to 1A

per cell, all cells can be balanced at the

same time) reduces time to charge the

battery.

Faster charge time.

Energy and cost savings.

Features and benefits

Feature Benefits

High

temperature

performance

Capable of operation in an extended

temperature range (-40°C to 85°C).

Prevents production stops due to

electromagnetic interference.

Reliable system performance.

Lower warranty exposure.

Savings due to simpler infrastructure

(charging possible even in cold-stores).

Excellent EMC

performance

Certified performance in the very

noisy electro-magnetic

environments.

Prevents production stops due to

electromagnetic interference.

Reliable system performance.

Lower warranty exposure.

Affordable Low cost of prototyping. Price in

production decreases rapidly with

volume.

Rapid ROI.

Allows economy of scale.