1 EBa M an EDA tool for Battery

1 EBa. M: an EDA tool for Battery Modeling POLITO 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” Energy source MPPT & control (Optional) www. arrowhead. eu DC-DC converter/ charger DC-DC converter Energy storage device (ESD) I, V load t

3 Automation for battery modeling Many battery models, with different complexities, are proposed in literature. 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. www. arrowhead. eu

EBa. M Framework www. arrowhead. eu

Battery Models should include. . . I-order effects: www. arrowhead. eu II-order effects: Battery runtime; Temperature effects on battery voltage; SOC-OCV relation; Temperature effects on capacity; SOC-transient response relation. Capacity fading due to cycling and storage (aging).

Model levels overview II Order Effects Level 1 Run. Time SOC Level 1 + Temperature Level 1 + Capacity Fading www. arrowhead. eu Level 2 Run. Time SOC Steady-State Response HIG HER ACC URA Level 2 CY + Temperature Level 2 + Capacity Fading Level 3 Run. Time SOC Steady-State Response Transient Response Level 3 + Temperature Level 3 + Capacity Fading

Level 1 model § battery runtime; § temperature effects; § possibility to further extend it for capacity fade. www. arrowhead. eu

Level 2 model Equivalent electric circuit model § battery runtime; § SOC-OCV relation; § temperature effects; § possibility to extend it for capacity fade. www. arrowhead. eu

Level 3 model § battery runtime; § SOC-OCV relation (transient); § temperature effects; § possibility to extend it for capacity fade. www. arrowhead. eu

Accuracy Level 2 Sony UP 383562 constant current @0. 0008 C www. arrowhead. eu 2 s @0. 1 C Level 3 Energizer CR 2032