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LIBAL S-BMS™SCALABLE BATTERY MANAGEMENT SYSTEM
Product Presentation
CONFIDENTIAL1
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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
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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
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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
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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
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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
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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
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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
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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.
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Charger control
Bulk charge phase
Balancing phase
Cell voltages rapidly
converging towards the
target voltage
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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.
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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
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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
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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
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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
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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
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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
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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.
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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.