Mock Presentation

Description

Similar to the Design Doc Check and the Mock Demo, the Mock Presentation is an informal, mandatory event designed to better prepare you for your Final Presentation. In these sessions, you will present a few of your slides (about 10-15 minutes), and get feedback from the course staff as well as a few invited Department of Communication TAs. You will also be able to see a few of your peers' Mock Presentations, as there are up to 3 teams per time slot.

Requirements and Grading

The Mock Presentation is meant to be an opportunity for you to get feedback on a subset of your final presentation. It is recommended that you choose some aspect of your project, and present the design, results, and conclusions from that aspect. In order to get relevant feedback on your presentation skills, your Mock Presentation should also have an introduction and conclusion. You will receive feedback on your delivery, the format of your slides, and the organization of your presentation. Your slides should generally include:

  1. Title slide: Names, group #, title.
  2. Introduction slide: What is the project?
  3. Objective slide: What problem does this solve?
  4. Design Slides: A few slides on design, requirements and verification (should include block diagram, math, graphs, figures, tables).
  5. Conclusion: Wrap things up, future work.

Mock presentation is graded credit/no credit based on attendance and apparent effort; showing up completely unprepared will earn no credit.

Submission and Deadlines

Sign-up is handled through PACE. Time slots are 1 hour long, and multiple groups will share a time slot. This will give you an opportunity to give and receive feedback from your peers. You will be required to stay until all groups have presented and received feedback.

Active Cell Balancing for Solar Vehicle Battery Pack

Tara D'Souza, John Han, Rohan Kamatar

Featured Project

# Problem

Illini Solar Car (ISC) utilizes lithium ion battery packs with 28 series modules of 15 parallel cells each. In order to ensure safe operation, each battery cell must remain in its safe voltage operating range (2.5 - 4.2 V). Currently, all modules charge and discharge simultaneously. If any single module reaches 4.2V while charging, or 2.5V while discharging, the car must stop charging or discharging, respectively. During normal use, it is natural for the modules to become unbalanced. As the pack grows more unbalanced, the capacity of the entire battery pack decreases as it can only charge and discharge to the range of the lowest capacity module. An actively balanced battery box would ensure that we utilize all possible charge during the race, up to 5% more charge based on previous calculations.

# Solution Overview

We will implement active balancing which will redistribute charge in order to fully utilize the capacity of every module. This system will be verified within a test battery box so that it can be incorporated into future solar vehicles.

Solution Components:

- Test Battery Box (Hardware): The test battery box provides an interface to test new battery management circuitry and active balancing.

- Battery Sensors (Hardware): The current battery sensors for ISC do not include hardware necessary for active balancing. The revised PCB will include the active balancing components proposed below while also including voltage and temperature sensing for each cell.

- Active Balancing Circuit (Hardware): The active balancing circuit includes a switching regulator IC, transformers, and the cell voltage monitors.

- BMS Test firmware (Software): The Battery Management System requires new firmware to control and test active balancing.

# Criterion for Success

- Charge can be redistributed from one module to another during discharge and charge, to be demonstrated by collected data of cell voltages over time.

- BMS can control balancing.

- The battery pack should always be kept within safe operating conditions.

- Test battery box provides a safe and usable platform for future tests.