Li-Ion battery Model Octavio Salazar Octavio Salazar Energy Storage- Lithium Ion Batteries C-PCS: Control and Power Conditioning System Energy Storage- Lithium Ion Batteries Octavio Salazar Nature [0028-0836] Tarascon (2001) volume: 414 issue: 6861 page: 359-367, Issues and challenges facing rechargeable lithium batteries, J.-M. Tarascon* & M. Armand? Battery Capacity and C-rate Battery Capacity A batterys capacity is measured in Amp-hours, called "C". This is the theoretical amount of current a battery delivers when discharged in one hour to the point of 100% depth of discharge C-Rate (a.k.a. Charge rate, Hourly Rate) The C rate is often used to describe battery loads or battery charging. 1C is the capacity rating (Amp-hour) of the battery. C-Rate C-Rate Hours of Discharge Example: Battery capacity= 1500mAh 1C=1500mA 2C=3000mA 0.5C=750mA 1C (1 hour rate) 1C 1 hour C/4 (4 hour rate) 0.25C 0.1C 4 hours C/10 (10 hour rate) 10 hours BMS = Battery Monitoring System SoC=State of Charge CC = Coulomb Counter (Accumulated Charge) UUC = Unusable Charge FCC = Full Charge Capacity of Battery OCV = open-circuit voltage PC = Battery Percentage Charge RUC = Remaining Usable Charge RC = Remaining Charge Page 4 Battery basics- lithium-ion batteries Intercalation process Lithium Ion batteries take advantage of the structure of graphite to intercalate Li Ions without drastically changing its initial structure Cathode materials [2] ?Layered oxides (LiCoO2) ?Transition metal phosphates(LiFePO4) ?Spinels (LiMn2O4) Basic Li-Ion battery lithiation Principle Current commercial Battery performance LiCoO2, C680mAh [1] Octavio Salazar