Details

Autor(en) / Beteiligte

• Schmalstieg, Johannes
• Käbitz, Stefan
• Ecker, Madeleine
• Sauer, Dirk Uwe

Titel

A holistic aging model for Li(NiMnCo)O2 based 18650 lithium-ion batteries

Ist Teil von

• Journal of power sources, 2014-07, Vol.257, p.325-334

Ort / Verlag

Amsterdam: Elsevier B.V

Erscheinungsjahr

2014

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Knowledge on lithium-ion battery aging and lifetime estimation is a fundamental aspect for successful market introduction in high-priced goods like electric mobility. This paper illustrates the parameterization of a holistic aging model from accelerated aging tests. More than 60 cells of the same type are tested to analyze different impact factors. In calendar aging tests three temperatures and various SOC are applied to the batteries. For cycle aging tests especially different cycle depths and mean SOC are taken into account. Capacity loss and resistance increase are monitored as functions of time and charge throughput during the tests. From these data physical based functions are obtained, giving a mathematical description of aging. To calculate the stress factors like temperature or voltage, an impedance based electric-thermal model is coupled to the aging model. The model accepts power and current profiles as input, furthermore an ambient air temperature profile can be applied. Various drive cycles and battery management strategies can be tested and optimized using the lifetime prognosis of this tool. With the validation based on different realistic driving profiles and temperatures, a robust foundation is provided. •Extended accelerated aging tests on lithium-ion batteries including storage and cycling.•Detailed analysis of temperature and voltage dependencies of calendar cell aging.•Detailed analysis of influence of cycle depth and SOC range on cycle aging.•Lifetime prediction based on identified main aging phenomena.•Comprehensive verification measurements for aging model.