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Battery Management System
Dual Battery System
Challenges -
- Different battery sizes requires different terminal current
- Cross charging
- Balancing
- Peak power handling
Big Ideas -
- VSYS voltage monitor comparetor should be inside PMIC or inside the GreenPak
- Data based DoU characterization method - benefits
- Direct comparable among different products/models
- Standardized characterization procedure
- Indisputable marketing DoU claim
- Easy translation to what-if DoU
- User oriented (vs engineering oriented) DoU communications
Modeling from Advanced BMS Work Shop AAC 2025
- Battery swells (some reversable, some permanent). It is found to be very beneficial to reduce aging by applying 5 psi pressure to physically limiting the swelling. Too much pressure can also be problematic. This information was provided by professor Anna G. Stefanopoulou from U. Michigan.
- P2D physical model
- PCA correlation analysis
- Parallel R*C benefits
- SOC physical model not temperature, c-rate dependent
- Symbolic regression.
- DFN (doyle fuller newman) model
- Single particle model (simple model has limitations)
- POD - reduced order model ROM
- ESPM
- Adaptive Ensemble Sparse Identification (AESI)
- SPCI method
- SYNDy approach
- SPM → ESPM