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Project presentation. Battery Swapping Reliability Wesley Lavender EMIS 7305. Presentation Outline. Overview Scope Problem Analysis Overview Industrial Robots Performing Swap Charging Stations Results Conclusions Questions. Overview.

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  1. Project presentation Battery Swapping Reliability Wesley Lavender EMIS 7305

  2. Presentation Outline • Overview • Scope • Problem • Analysis • Overview • Industrial Robots Performing Swap • Charging Stations • Results • Conclusions • Questions

  3. Overview Battery swapping stations have been proposed by Better Place as a solution to the problem of electric vehicle batteries’ limited range. The Better Place switch stations are currently in the demonstration phase and use a mix of mature and immature technology. Better Place Switch Station

  4. Scope • Original Scope: • Reliability, Maintainability, Supportability • Analyzing the battery identification process, battery swapping process, and the charging of depleted batteries • Refined Scope: • Reliability only • Analyze battery swapping process (including the clamping mechanism, the retrieving mechanism, and the moving tray) and charging stations

  5. Problem • Battery swapping is new and immature • Little testing completed on reliability of battery swapping systems • Complex system with a lot of moving parts

  6. Analysis Overview, Industrial Robots Performing Swap, and Charging Stations

  7. Overview • Selected Model: Exponential • commonly used for electronic equipment • constant failure rate model • used in analyzing the ‘useful life’ period of an item’s life • Failure rates and MTBFs used were measured during testing

  8. Industrial Robots Performing Swap • 3 Primary Components: • Clamping mechanism: holds vehicle in place while swapping battery • Retrieval mechanism: retrieves/inserts batteries • Moving tray: contains clamping and retrieval mechanisms and moves batteries to and from vehicle FIGURE 1: Industrial Robots failure rates and MTBFs

  9. Industrial Robots Performing Swap Reliability Function:

  10. Industrial Robots Performing Swap Components in a series configuration: Product Rule of System Reliability: RS(t) = (0.966)*(0.905)*(0.911) = 0.796 Failure rate: = 0.000213 MTBFS = 4,706 Clamping Mechanism Retrieval Mechanism Moving Tray

  11. Charging Stations S1 • 5 identical, independent charging stations • Need at least 3 in operation at all times • R-out-of-N configuration (n=5, r=3) S1 S1 S1 S1 3 out of 5

  12. Charging Stations

  13. Results FIGURE 4: Summary of reliabilities, failure rates, and MTBFs

  14. Conclusions • Technology too immature for widespread commercial implementation • Industrial robot system should use redundancy to improve reliability • Charging stations should improve reliability of individual stations to improve overall reliability

  15. Questions? References: "Better Place." Wikipedia. Wikipedia Foundation, Inc., 07APR2012. Better Place official website. www.betterplace.com. EMIS 7305 class notes.

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