锂电池内短路分析.pdf

Journal of Power Sources 191 (2009) 568–574 Contents lists available at ScienceDirect Journal of Power Sources j o u rn al h omepage: w w w. elsev /locate/jpow sour Internal short circuit in Li-ion cells Hossein Maleki ∗ , Jason N. Howard Motorola Inc Devices, 1700 Belle Meade Court, Lawrenceville, GA 30043, United States a r t i c l e i n f o a b s t r a c t Article history: Effects of internal short circuit (ISCr) on thermal stability of Li-ion cells of various sizes (130–1100 mAh) are Received 7 January 2009 investigated using a combination of experimental methods and thermal modeling. Three experimental Received in revised form 20 February 2009 methods were evaluated: small nail penetration, small indentation, and cell pinch test. The small nail Accepted 23 February 2009 penetration and indentation tests created significant heat sinking to the cell-can or to the nail. Only the Available online 6 March 2009 cell pinch test provided a reasonable approximation of a high risk ISCr event. ISCr location plays a critical role in the consequences of an ISCr event. ISCr at the edge of the electrode is the worst case because of Keywords: its limited heat conduction to the cell-can. The effects of cell capacity and state of charge on ISCr are also Li-ion cells Li-ion Batteries evaluated through tests and thermal modeling. Internal short circu