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1© 2015 The MathWorks, Inc.
Developing Battery Management
System using Simulink
Chirag PatelApplication Engineer
MathWorks
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Agenda
▪ What is BMS and what engineers worry about?
▪ Start with single battery cell and build a pack
▪ Design BMS algorithms
▪ Generate code and deploy
▪ Model V&V
▪ Hardware-in-Loop testing
▪ Summary
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What is BMS?
Electronics Battery PackSoftware
Supervisory tasks
SOC estimation
Contactor management
Isolation monitoring
Fault detection and recovery
Thermal Management
Current & Power Limits Block Voltage,
Temperature Measurement
Cell Diagnostic
Cell Balancing
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Motivation
Long Iteration Cycles Safety Critical SystemCollaboration Gap
Simulations and Code
Generation
Model V&V and Hardware-In-
Loop Testing
Multi-Domain Modeling
Environment
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Where do we start?
Gain insight into cell behavior and model it
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Equivalent Circuit Model
E
+
I I
C 1 C n
R n n 1 R 1
V
R 0
m
I m
+
Ip
Ep
Zp
[Ex Rx Cx] = f(SOC, Temperature…)
Transient
Dynamics
Parasitic
Losses
Terminal
Resistance
Open-Circuit
Voltage
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Battery Cell Blocks in Simscape
▪ Chose block for fidelity and simulation speed
▪ Parameterize as function of SOC &
Temperature
▪ Add thermal and fade effects
▪ Create custom battery blocks using
Simscape language or Simulink
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R0
R1
C1Em
model (Em,R1,R0,C1)
experiment=
inout
out ☺
Parameter Estimation
Goal:
Model should match real data as closely as possible
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Parameter Estimation
Before
After
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Look-up Tables
Em
(Volts)
SOC
1
SOC
0.9
SOC
0.8…
SOC
0
5°C
20°C
40°C
Repeat parameter estimation for each
Temperature break-point in LUT
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Start with Simulation
Battery Cell → Large Battery Pack
System
Cell Dynamics
Pack
Thermal Model
Demo
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Evaluate System Behavior
Demo
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Discharge + Charge
Cell Voltages
Pack Current SOC
Temperatures
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Discharge Only
Cell Voltages
Pack Current SOC
Temperatures
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Charge Only
Cell Voltages
Pack Current SOC
Temperatures
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true
Coulomb counting EKF
UKF
Evaluate SOC Estimation
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Generate C/C++ Code From BMS Algorithm Models
Demo
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Did we generate code too early?
Is this ready to ship?
What if there are bugs?
Where are they? How do we find them?
Let’s
Find
Out
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Why Testing, Verification and Validation
Safety Critical System Functional Safety Certification
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Requirements
Typical Development Workflow
Specification C/C++/HDL
Most errors introducedUnit test finds some
errors
Errors found during
integration or in field
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Requirements
Challenge: Errors introduced early but found late
Specification C/C++/HDL
Most errors introducedUnit test finds some
errors
Errors found during
integration or in field
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Validate Design via Desktop Simulation
Requirements C/C++/HDLDesign
Model
Unit test finds some
errors
Errors found during
integration or in field
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Model-Based Design Workflow
RequirementsDesign
Model
Model used for
production code
generation
Simulink Models
C/C++/HDL
Generated code
Code
Generation
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Model VerificationDiscover design errors at design time
RequirementsDesign
Model
Model used for
production code
generation
Simulink Models
C/C++/HDL
Generated code
Model-Based Design Verification Workflow
Component
and system
testing
Equivalence
testing
Equivalence
checking
Review and
static analysis
Code VerificationGain confidence in the code
Code
Generation
✓ Faster development
✓ Less hassle
✓ Reduced cost
✓ More Engineering
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How do we test?
RequirementsDesign
Model
Model used for
production code
generation
Simulink Models
C/C++/HDL
Generated code
Is it functioning
correctly?
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Test Case
Main Model
Systematic Functional Testing with Simulink Test
AssessmentsInputs
Test Sequence
MAT file (input) MAT file (baseline)
Assessments
MATLAB Unit Test
Excel file (input) Excel file (baseline)
Test Harness
Model Sim through SIL, PIL and HIL
Scale with PCT and CI
and more! and more!
Signal Editor
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Create Test Harnesses
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Systematic Functional Testing with Simulink Test
Use Test Manager to:
• Author, execute, manage test cases
• Review, export, report
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Manage and Organize TestCases
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How do we know we have enough test?
RequirementsDesign
Model
Model used for
production code
generation
Simulink Models
C/C++/HDL
Generated code
Does the
design meet all
requirements?
Is it functioning
correctly?
Is it
completely
tested?
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How do we know we have enough test?
RequirementsDesign
Model
Model used for
production code
generation
Simulink Models
C/C++/HDL
Generated code
Does the
design meet all
requirements?
Is it functioning
correctly?
Is it
completely
tested?
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Integrate with requirements tools and author requirements
Simulink Requirements
Authored Requirements
External Requirements
External
Requirements
Requirements
Managements
Tools
• Import from:
• Word / Excel
• IBM® Rational® DOORS®
• ReqIF™ standard
• Update synchronizes
changes from source
• Edit and add further details to
import
• Author requirements
• Export ReqIF
• Enables roundtrip with
external tools
Import
Update
Export
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Import External Requirements & Author New Requirements
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SW Requirements - Implementation Status
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Track Implementation and Verification
Implementation Status
Implemented
Justified
Missing
Verification Status
Passed
Failed
Unexecuted
Missing
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Simulink / Stateflow
Test Case
Requirements Verification with Simulink
Implemented
By
Test Harness
Inputs
Test Sequence
Signal Editor
Assessments
Test
Assessments
MATLAB Unit Test
Verified
By
Simulink Test
MAT / Excel
file (input)
MAT / Excel
File (baseline)
Requirements
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Link Tests to Requirements
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How do we know we have enough test?
RequirementsExecutable
Specification
Model used for
production code
generation
Simulink Models
C/C++/HDL
Generated code
Does the
design meet all
requirements?
Is it functioning
correctly?
Is it
completely
tested?
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Coverage Analysis to Measure Testing
Simulink• Identify testing gaps
• Missing requirements
• Unintended Functionality
• Design Errors
Stateflow
Generated Code
Coverage Reports
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Measure Model Coverage
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Addressing Missing Coverage
Test Cases from
Functional Requirements
Partial Coverage
Test
Generator
Simulink Design Verifier
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Addressing Missing Coverage
Test Cases
New Test CasesFull Coverage
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Automatic Test Generation
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Systematic Simulation Testing
RequirementsDesign
Model
Model used for
production code
generation
Simulink Models
C/C++/HDL
Generated code
Does the
design meet all
requirements?
Is it functioning
correctly?
Is it
completely
tested?
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Real-Time Testing of Battery Management System
Main ControllerMeasurement &
DiagnosticsBattery Pack
Testing BMS with Battery Cells
– Longer test cycles
– Difficult to reproduce results
– Difficult to test fault conditions
– Limited test automation
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Hardware-In-Loop Testing of Battery Management System
Wiring and Signal Conditioning
Automatic
Code Generation
Main ControllerMeasurement &
DiagnosticsBattery Emulation
Testing BMS with Emulated Battery Cells
– Reduce testing time
– Test fault conditions safely
– Automate testing
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Execute Large Battery Models in Real-time
– Cell Voltages: ~100Hz
– Current: ~1kHz (Accurate Coulomb Counting & current derating
calculations)
– Cell / Pack Temperatures: ~1 to 10Hz (Large time constant for
thermal system)
Sensor and Fault Emulation
– Produce Isolated Voltages
– Sink and Source Current
– Support Series and Parallel Configuration
– Temperature simulation
Challenges in setting up HIL testing for BMS
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Execute Large Battery Models in Real-time
Prepare Model for Real-time Simulation (if using
Simscape)
– Use Simscape Local Solver
– Configure fixed-cost simulations
– Try “Partitioning” option for non-linear systems*
Webinar on “Real-Time Simulation of
Physical Systems Using Simscape”
Reducing model complexity
– Select right variant of battery block to match
desired model fidelity
– Reduce order of charge dynamics by
selecting fewer number of time-constants
2-3x
5x
2-3x
5x
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Sensor and Fault Emulation
Battery Emulation (IO991-06)
– 6 independent isolated channels
– Architecture allows series and parallel stack combinations
– Voltage range of 0-7 V with 14-bit resolution
– Source 300mA and sink 100 mA
Temperature Sensor Emulation
– RTD (PT100, PT1000) – low resolution 6 channel module
– Thermocouple – accurate 32 channels
– High precision resistor simulation modules
Fault Insertion
– 1A to 40A current handling; Up to 4 fault buses
– Electromechanical or MOSFET switches
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Conclusion
Leverage models to
communicate technical
specifications, design
implementation, results
and maintain traceability
Test your design iterations
every step of the way
through simulations and
Hardware-In-Loop testing
Gain confidence in design
and work towards safety
certification
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Learn More about Battery Management System
Download Link to
File Exchange
For more info:
Chirag Patel
THANK YOU