1) Heat in a litium ion battery

posted Jul 1, 2011, 3:11 AM by Ecmi Milano   [ updated Jul 8, 2011, 12:02 AM ]

Instructor: Raoul Borsche

Nowadays many electrical items are supplied by lithium ion batteries. These are used in sizes ranging from relatively small, e.g. in mobile phones, over medium, e.g. laptops, up to large batteries as in electrical cars. As a side effect all lithium ion batteries produce heat, if their electrical power is consumed. In daily use this is mostly tolerable. But in case of an electrical bypass this might cause a large increase in the temperature. This might cause a burning of the battery and in a worse case an explosion, due to the gas generated by the liquid electrolyte. This is a serious problem, for this reason e.g. on flights batteries are onl yallowed in the hand luggage or have to be securred sufficently. Therefore the following questions arise: Can the evolution of heat in a lithium ion battery be modeled properly? Which amount of current is critical for a common lithium ion battery? Can this side effect be overcome by some modification, e.g. in the design?

Preferred mathematical background: Basic Physics, Matlab.