Transcript LithiumIon Battery Char

For Electric Vehicle
Team Members
•Pramit Tamrakar- Electrical Engineering
•Jimmy Skadal- Electrical Engineering
•Hao Wang- Electrical Engineering
•Matthew Schulte- Electrical Engineering
Advisor
•Ayman Fayed
Client
•Adan Cervantes- Element One Systems
Team-id- SdMay11-04
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.

Successfully build a small scale 18 cell charger that is capable of
monitoring and balancing the scaled down system.
MSP430 Launch Pad
Buck Circuit
Bq76pl536EVM-3
Evaluation module
For battery
management
Functional Decomposition (Hardware)
Functional Decomposition (Software)
UCC28019AEVM Boost Circuit

Will supply the needed maximum 324
volts to the buck circuit for the large
scale charger

350 W Power Factor Correction (PFC)
boost converter

390 VDC regulated output

0.9 A of load current

Advanced fault protection
Buck circuit and Feedback Loop

The buck circuit will take the
voltage generated by the
boost buck down to cells

The negative feedback loop
Scaled down buck circuit

Negative feedback tends to
compare actual voltage with desired
voltage and seeks to reduce the
difference
Inductor
100uH
Capacitor
330uF
Value of components
Battery Management System

Texas Instruments bq76PL536EVM-3 and
MSP430 microcontroller to monitor and
regulate the Li-Ion batteries and send
information packet to the processor.
Battery Management System
Programming using C and WinGUI
 Use SPI with an MSP430 to gather the
data and make decisions based on
battery status


Implementation of the bq76pl536 with 6 series
cells in each
Test Plan

Subsystem test:
• Boost Converter
• System DC supply
• Buck Converter
• All necessary voltages and currents
• Battery Management System communication
• USB-SPI Processing GUI

Integration Test (scaled down):
• 18 cell charge/discharge
• 32.4V-72V CC, 72V CV until 0.3A to batteries
Schedule Progress
Cost Breakdown
Item
W/O Labor
With Labor
Parts and Materials:
a. Previous school sessions
$402.51
$402.51
b. Printed Circuit Boards
$50.00
$50.00
c. Discrete components
$100.00
$100.00
$0
$0
$50.00
$50.00
$150.00
$150.00
$752.51
$752.51
a. oscilloscope, function generator, digital multimeter, PSU
$0
$0
b. soldering equipment
$0
$0
$0
$0
d. Texas Instruments ICs
e. TI PFC boost converter
f. MSP430 programming board
Subtotal:
Test and Build equipment
Subtotal:
Labor at $20.00/hour:
a. Previous school sessions
$28,000
b. Hao Wang
$4,000
c. Pramit Tamrakar
$4,000
d. Matt Schulte
$4,000
e. Jimmy Skadal
$4,000
Subtotal:
$0
$44,000
Texas Instruments endowment:
($200)
($200)
Total:
$552.51
$88,752.51
Questions ?