Team Shock Therapy Team members: Tim BlakeEE Senior Travis McMillenEE Senior David BankheadEE Senior Advisors: Greg Donohoe Herb Hess Jim Klein

Opportunity Statement NAVY has electric submarines and ships Batteries for these are replaced every 4 years Costs NAVY a lot of money to replace batteries Looking for a way to extend battery life

Sponsor

Understand project Define paramet ers Begin Testing Order parts and implement into project Shock Therapy Timeline MayAprilMarchFebDecNovOctSepJan 9 months projected plan Visit Bayview site Implement Ideas and schematics Engineering Expo Final Testing Draw conclusions / complete project Fabricate project

Project Needs Compare pulse charging vs. standard (constant- current, constant-voltage) charging Develop an algorithm and test setup to characterize battery rejuvenators Find the best charging methods (types of rejuvenators) for the Navy – Current charging system will be replaced in the near future and they want to implement the best charging methods possible. – Increase battery life – Develop a way to rejuvenate “dead” batteries

Project Learning Different charging methods are used to rejuvenate batteries – CCVT(Constant Current Constant Voltage) – Pulse Mostly dealing with pulse chargers – Renaissance – BatteryMinder Types of batteries: – 12 & 2 Volt, dry cell, lead acid batteries

How do you know when a battery’s life is done? Currently batteries are known to be unusable if they cannot be charged to a certain voltage. Our batteries are dry cell batteries so they cannot be checked by pH or sulfate levels. One of the primary goals of this project is to determine if there are any parameters other than voltage drop that exist which would indicate a “dead” or “dying” battery.

Preliminary concepts Design a battery rejuvenator of our own based on analysis – Compare with commercial product Create test set up that will characterize pulse chargers – Software algorithm – Manual testing procedure