DC25_SLIDES_Drive_ResurrectingDeadTesla_O'Conner_REVISED.pdf

1、Information Classification:GeneralWelcome to ConferenceJanuary 2830,2025 Santa Clara Convention Center1ExpoJanuary 2930,2025 Information Classification:GeneralResurrecting“dead”Tesla batteries with advanced battery management technologyClint OConner,Co-founderTrue Balancing LLC2The worlds most advan

2、ced battery management technologyCreditsFunded by a grant from California Energy Commissions CalTestBed programTesting performed by Center for Energy Research(CER)at University of California San Diego(UCSD)Tesla battery modules provided by EV West1Test Plan1.Buy 8 used Tesla Model S modules2.Quantif

3、y SOH at CER at UC San Diego3.Connect True Balancing to the modules4.Quantify improvement to SOH after one charge/discharge cycle5.Continue cycling until we used up all of the grant money The worlds most advanced battery management technology2PicturesThe worlds most advanced battery management techn

4、ology2The worlds most advanced battery management technology5Key FindingsFive of eight modules were“dead”We think we found the most common failure mode in EV batteriesTrue Balancing was able to resurrect the dead modulesWe developed a new approach to balancing batteriesValidated the efficacy of our

5、technologyThe worlds most advanced battery management technology6Step 1:Analyze,then ResurrectModel S modules have a 6S/74P architecture;16 modules in seriesEach“dead”module had one cell group that was very low voltageOne leaky cell was pulling down the entire cell groupWe connected True Balancing t

6、o each of the bad modulesBrought them back into balance and into a safe range of operationThe“dead”modules were brought back to lifeBut they still had a leaky cellThe worlds most advanced battery management technology7Step 2:Failure Mode Analysis One leaky cell pulls down all of the cells in the 74P