NASA报告-软包电池设计：车用电池性能和问题.pdf

Li-ion Pouch Cell Designs; Performance and Issues for Crewed Vehicle Applications by Eric Darcy NASA-JSC For Electric Aircraft Symposium 29 April 2011 Santa Rosa, CA Outline Li-ion Pouch Cells • Purpose and Motivation • Cell designs evaluate • Cell lot uniformity, why that’s important • Forward plans – High rate performance – Cycle life durability – Seals – Corrosion susceptibility – Manufacturing quality • Conclusions Purpose Motivation • Compelling Advantages – Li-ion pouch cell designs provide the highest specific energy ( 220 Wh/kg), energy density ( 450 Wh/L) of all commercially available designs – Many high power designs also exist with very impressive performance ( 2000 W/kg and 4000 W/L) – Numerous designs are being produced world wide in high volumes for the emerging EV/HEV/PHEV market • As such, calendar life, cycle life, and durability has been improved over the last 5 years • Many designs have extensive field testing and therefore, maturity • Our purpose: Are there any performance show stoppers for spinning them into spacecraft applications? – Are the seals compatible with extended vacuum operations? – How uniformly and cleanly are they made? – How durable are they? • Why now? – Electric vehicle market has driven significant improvements – Many of our applications (VASIMR, R2, etc) could benefit right now – We have access to several high volume cell suppliers which will soon have US production lines up and running Maturity of Pouch Cell/Module Des