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www.arrowhead.eu EBaM: an EDA tool for Battery Modeling 1 POLITO
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www.arrowhead.eu Outline …Energy efficiency is often centered around the “device” …But overall efficiency can be decided in other parts of the “energy path” DC-DC converter/ charger MPPT & control MPPT & control load Energy source I, V t DC-DC converter Energy storage device (ESD) (Optional)
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www.arrowhead.eu 3 Limitations: Costs & Time: calculation of model parameters is based on actual measurements Lack of generality: a given circuit/model cannot be used to represent another device, i.e., validation is carried out on the specific battery under measure Solution: Modeling from datasheet: resort to information available in the datasheets provided by the battery manufacturers; Variable accuracy model templates: since datasheets often provide limited info, adapt the model template (accuracy) to the amount of information. Automation for battery modeling Many battery models, with different complexities, are proposed in literature.
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www.arrowhead.eu EBaM Framework
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www.arrowhead.eu Battery Models should include...
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www.arrowhead.eu Model levels overview Level 1Level 2Level 3 I Order Effects RunTime SOC RunTime SOC Steady-State Response RunTime SOC Steady-State Response Transient Response II Order Effects Level 1 + Temperature Level 2 + Temperature Level 3 + Temperature Level 1 + Capacity Fading Level 2 + Capacity Fading Level 3 + Capacity Fading HIGHER ACCURACY
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www.arrowhead.eu Level 1 model battery runtime; temperature effects; possibility to further extend it for capacity fade.
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www.arrowhead.eu Level 2 model Equivalent electric circuit model battery runtime; SOC-OCV relation; temperature effects; possibility to extend it for capacity fade.
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www.arrowhead.eu Level 3 model battery runtime; SOC-OCV relation (transient); temperature effects; possibility to extend it for capacity fade.
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www.arrowhead.eu Accuracy Level 2 Level 3 Sony UP383562 Energizer CR2032 constant current @0.0008C 2s @0.1C
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