Implement the Features from Paulson et al.

[WardLT]

We need public implementations of the features from Paulson et al., Table 1

Implement the following features

• [ ] Median current, charge and discharge
• [ ] Average voltage, charge and discharge
• [x] Cumulative capacity, charge and discharge
• [x] Cumulative energy, charge and discharge
• [ ] Coulombic efficiency
• [ ] Energy efficiency
• [ ] Median current normalized by the lifetime median current, charge and discharge
• [ ] Capacity as a fraction of initial capacity
• [ ] Time charging and time discharging
• [ ] Time at constant current, charge and discharge
• [ ] Time at constant voltage, charge and discharge
• [ ] Ratio between time at constant current and constant voltage, charge and discharge
• [ ] Time interval during equal voltage change (3.5-4.0V), charge [Need @npaulson clarification]
• [ ] Voltage at start and end of charge and discharge
• [ ] Voltage at a certain state of charge, charge and discharge
• [ ] Derivative of voltage wrt time at a certain state of charge, charge and discharge
• [ ] Voltage change between start of cycle and certain time, charge and discharge
• [ ] Open circuit voltage at a certain state of charge [Requires ECM fitter]
• [ ] Resistance at a specific state of charge [Requires ECM fitter]
• [ ] SOC at a specified voltage
• [ ] Location of each peak in the dQdV curve, charge and discharge [Requires peak detection]
• [ ] Magnitude of each peak in the dQdV curve, charge and discharge [Requires peak detection]
• [ ] Area under each peak in the dQdV curve, charge and discharge [Requires peak detection]
• [ ] Location of each valley in the dQdV curve, charge and discharge [Requires peak detection]
• [ ] Magnitude of each valley in the dQdV curve, charge and discharge [Requires peak detection]
• [ ] Location of each peak in the dVdQ curve, charge and discharge [Requires peak detection]
• [ ] Magnitude of each peak in the dVdQ curve, charge and discharge [Requires peak detection]
• [ ] Location of each valley in the dVdQ curve, charge and discharge [Requires peak detection]
• [ ] Magnitude of each valley in the dVdq curve, charge and discharge [Requires peak detection]
• [ ] Statistics of the different in rate of SOC vs voltage distribution between changes, charge and discharge
• [ ] Change in SOH at a function of cycle

then

• [ ] Create an example on how to compute the features

[WardLT]

Added capacity-related features in #55 , though we can improve them #58