BMS introduction
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Questions / Open Points
8
Lithium Ion Battery Management System
BMS Product Overview Pro (BMU)
BMS controlled relays
BMS Product Overview 4 Main Features of the BMS System
Contactor control
Switching of Contactors to Disconnect/Connect the Battery and the Intermediate Circuit, resp. the Charge Circuit
HV-CS
LIN
LIN
(Sync.)
BMU: high voltage side
COM Supply
Relais Driver Contact Monitor
µC
(FUSA - SC)
CAN
CANs
µC (MC)
µC
(SC - FUSA)
Isolation Monitor
COM
COM and internal CAN 2 internal CANs: between main communication controller (MC) and safety controller (SC)
G: charges HV battery M: energy from HV battery consumes energy BMS system:
Responsible for controlling relays between G and HV battery AND between HV Battery and M
Hella management system
Lithium-Ion Battery Management System
BMS Product Overview Agenda
Hella Group Lithium-Ion Battery Management System
• Architecture Proposal / BMS overview • Lithium-Ion Battery Monitor Unit (BMU) • High Voltage Current Sensor (HVCS/IBS) • Lithium-Ion Cell Monitor Unit (CMU) • Isolation Measurement Device (IMD/IMOC)
BMU
HVCS
LxDxH: 230x155x30 Weight: 350 g
CMU
LxDxH: 95x35x20 Weight: 60 g
LxDxH: 140x85x20 Weight: 70 g
BMS Product Overview Agenda
Hella Group Lithium-Ion Battery Management System
11
Lithium Ion Battery Management System
BMS Product Overview Product - High Voltage Current Sensor (HVCS)
Product Function
Current Sensor (A) for Hybrid and Electric Vehicles Based on 12V IBS design Galvanic isolation between measurement path (HV) and communication interface (BMU) Integrated Ah balancing Accuracy Measure range +/-23A resolution 1mA Measure range +/-375A resolution 12mA Measure range +/-1500A resolution 50mA Sampling freq:1KHz Accuracy:±0.2 %
• Lithium-Ion Battery Monitoring Software (SW)
Questions / Open Points
2
Lithium Ion Battery Management System
BMS Product Overview Motivation – What for use a BMS system?
BMU: High Voltage Side BMU: Low Voltage Side
(differential bus)
CMU N CMU2 CMU1
CellController Down
Fault line DAISY CHAIN
Optional: SSV for monitoring fault line
2 external CANs: Vehicle CAN + MC measurement CAN
Galvanic Isolation
6
Lithium Ion Battery Management System
BMS Product Overview Mechanical - Interfaces to vehicle
9
Lithium Ion Battery Management System
BMS Product Overview Agenda
Hella Group Lithium-Ion Battery Management System
• Architecture Proposal / BMS overview • Lithium-Ion Battery Monitor Unit (BMU) • High Voltage Current Sensor (HVCS/IBS) • Lithium-Ion Cell Monitor Unit (CMU) • Isolation Measurement Device (IMD/IMOC)
Measures and controls the functionality of the HV-Battery Used in Hybrid and Electronic Vehicles Functional Safety Relevance • Injury of humans due to High Voltage
Picture
Status Hella B-sample Series development ongoing Production line: Shanghai
Product Characteristics + interfaces
Two µC (32bit Freescale Bolero), ASIL B classification Scalable to different battery sizes (Hybrid or EV) Integration into battery package possible Synchronisation of the U, I, T measurement Interfaces in total 5 High Speed CAN Interfaces 1 LIN Interface ( HV Current Sensor ) CMU Interface (daisy chain): Differential 2 wire communication for cell values (U, I, T, Balancing, Error)
• Lithium-Ion Battery Monitoring Software (SW)
Questions / Open Points
10
Lithium Ion Battery Management System
BMS Product Overview - High Voltage Current Sensor Scaling concept for high voltage applications
Measure battery values
Cell voltages/temperatures (CMUs) + HV on link/battery pack side (IMOC)+ current flow (HVCS)
IMOC: Isolation Resistance Measurement Resistant between HV+/- and GND with active + passive method supported
• Injury of humans due to uncontrollable fire of Lithium Cells
BMS Product Overview Normal electrical system of EV/PHEV cars
Electric system
Energy sources and consumers:
12V
Supply
Cell-Controller Up
VNX,TNY, Balancing
V2X,T2Y, Balancing
V1X,T1Y, Balancing 12V
BMS ECU
µC (MC) HW I/O
Battery Pack N
Battery Pack 2
Battery Pack 1