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For Electric Vehicle. Team Members Pramit Tamrakar - EE Jimmy Skadal - EE Hao Wang - EE Matthew Schulte - EE William Zimmerman - EE Advisor Ayman Fayed Client Adan Cervantes- Element One Systems Team-id - SdMay11-04. Multi-Cell Lithium-Ion Battery Management System. - PowerPoint PPT Presentation
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MULTI-CELL LITHIUM-ION BATTERY MANAGEMENT SYSTEM
For Electric VehicleTeam Members• Pramit Tamrakar - EE• Jimmy Skadal - EE• Hao Wang - EE• Matthew Schulte - EE• William Zimmerman - EE
Advisor• Ayman Fayed
Client• Adan Cervantes- Element One Systems
Team-id- SdMay11-04
Problem Statement
To develop an efficient and safe system for charging and monitoring of multi-cell series batteries in Electric Vehicles by using AC to DC converters.
System Specifications
CCCV Charging sequence forLithium-Ion Batteries
Charging Goal
18 Series Batteries, 2.3 Ah each 45 minute CCCV charge
Project Goals and System Diagram Design a Lithium Ion Battery Charger that is capable of safely charging 16
parallel packs of 90 cells in series (Large Scale System). Successfully build an 18 cell charger that is capable of monitoring and balancing
the cells. (Small Scale System)
Full Scale System Diagram
Project Plan Acquire boards/parts from TI
Use built in capabilities to daisy chain the boards
Close the feedback loopConnect the boost converter, buck
converter, test board, current sensing resistor, amplifier, and aardvark software to ensure proper charging
Test & Prototype the small scales design Hardware Cost
$2120.00
Project Design
Small Scaled System Diagram
BQ76PL536EVM-3• Battery management
system
• Track the voltage and temp. for all batteries
MSP430 with buck circuit• Generate All necessary
voltages and currents with PWM
• Negative feed-back loop
Aardvark Interface• To display the status of the
charging system
Project Design Issue Daisy-chained EVMs
Proved the ability to hook together multiple EVMs.
System Signal Components Ordered MOSFET drivers and power resistor to operate our buck
converter
Ordered components to amplify small signals produced by the micro-controller
SPI Communication Programming MSP 430 in order to build SPI communication between
micro-controller and EVMs
Buck Circuit Implementation and Testing The buck circuit will take a voltage given by
some supply and decrease the value as needed.
There will be a negative feedback loop in the system so the Buck can accurately output the desired current or voltage.
Inductor 100uHCapacitor 330uF
Value of components for scaled down buck
circuitTested Buck Circuit with PSpice by changing the input PWM and observing the output.
Buck Testing Variac wall transformer (rectified) to DC Input DC from Variac at 65V Buck output expectations:
32.4V-64.6VMax 3APower Resistor Test Load
Buck Testing Schematic
EVM- Testing Plan TI’s processor bq76PL536EVM-3 and
Aardvark USB-SPI adaptor
Aardvark driver will be installed in a laptop before installing the TI evaluation software
Tested the EVM board with 12-26 VDC Power Supply
Plan to configure the EVM with cells
Use the TI’s WinGUI user interface software to monitor the status of the cell
EVM- Safety The battery connections should be made secure, a loose
connection may result in device destruction. The ideal connection sequence is from pin P1.1 to pin 3.7 in
order to avoid the any connection error The Absolute Maximum voltage per IC is 36V Caution must be taken when using the EVM as part of a
stack , where lethal voltages may be present
MSP430 Programming Code Composer Studio v4 Tested modules:
High frequency clockADCTimer/PWMBasic feedbackLow Power Mode
Unfinished:SPI communication
Semester Schedule
Questions ?
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