pyprobe.analysis.base.degradation_mode_analysis_functions module#

A module containing functions for degradation mode analysis.

ocv_curve_fit(SOC, fitting_target_data, x_pe, ocp_pe, x_ne, ocp_ne, fitting_target, optimizer, x_guess)#

Fit half cell open circuit potential curves to full cell OCV data.

Parameters:

  • SOC (NDArray[np.float64]) – The full cell SOC.

  • fitting_target_data (NDArray[np.float64]) – The full cell OCV data.

  • x_pe (NDArray[np.float64]) – The cathode stoichiometry data.

  • ocp_pe (NDArray[np.float64]) – The cathode OCP data.

  • x_ne (NDArray[np.float64]) – The anode stoichiometry data.

  • ocp_ne (NDArray[np.float64]) – The anode OCP data.

  • fitting_target (str) – The target for the curve fitting.

  • optimizer (str) – The optimization algorithm to use.

  • x_guess (NDArray[np.float64]) – The initial guess for the fitting parameters.

Returns:

The optimized fitting parameters.

Return type:

NDArray

calc_electrode_capacities(x_pe_lo, x_pe_hi, x_ne_lo, x_ne_hi, cell_capacity)#

Calculate the electrode capacities.

Parameters:

  • x_pe_lo (float) – The cathode stoichiometry at lowest cell SOC.

  • x_pe_hi (float) – The cathode stoichiometry at highest cell SOC.

  • x_ne_lo (float) – The anode stoichiometry at lowest cell SOC.

  • x_ne_hi (float) – The anode stoichiometry at highest cell SOC.

  • cell_capacity (float)

Returns:

  • NDArray: The cathode capacity.

  • NDArray: The anode capacity.

  • NDArray: The lithium inventory.

Return type:

Tuple[float, float, float]

calc_full_cell_OCV(SOC, x_pe_lo, x_pe_hi, x_ne_lo, x_ne_hi, x_pe, ocp_pe, x_ne, ocp_ne)#

Calculate the full cell OCV.

Parameters:

  • SOC (NDArray[np.float64]) – The full cell SOC.

  • x_pe_lo (float) – The cathode stoichiometry at lowest cell SOC.

  • x_pe_hi (float) – The cathode stoichiometry at highest cell SOC.

  • x_ne_lo (float) – The cathode stoichiometry at lowest cell SOC.

  • x_ne_hi (float) – The anode stoichiometry at highest cell SOC.

  • x_pe (NDArray[np.float64]) – The cathode stoichiometry data.

  • ocp_pe (NDArray[np.float64]) – The cathode OCP data.

  • x_ne (NDArray[np.float64]) – The anode stoichiometry data.

  • ocp_ne (NDArray[np.float64]) – The anode OCP data.

Returns:

The full cell OCV.

Return type:

NDArray

calc_full_cell_OCV_composite(SOC, z_pe_lo, z_pe_hi, z_ne_lo, z_ne_hi, x_pe, ocp_pe, x_c1, ocp_c1, x_c2, ocp_c2, comp1_frac)#

Calculate the full cell OCV.

Parameters:

  • SOC (NDArray[np.float64]) – The full cell SOC.

  • z_pe_lo (float) – The cathode stoichiometry at the lowest cell SOC.

  • z_pe_hi (float) – The cathode stoichiometry at the highest cell SOC.

  • z_ne_lo (float) – The anode stoichiometry at the lowest cell SOC.

  • z_ne_hi (float) – The anode stoichiometry at the highest cell SOC.

  • x_pe (NDArray[np.float64]) – The cathode stoichiometry data.

  • ocp_pe (NDArray[np.float64]) – The cathode OCP data.

  • x_c1 (NDArray[np.float64]) – The anode component 1 stoichiometry data.

  • ocp_c1 (NDArray[np.float64]) – The anode component 1 OCP data.

  • x_c2 (NDArray[np.float64]) – The anode component 2 stoichiometry data.

  • ocp_c2 (NDArray[np.float64]) – The anode component 2 OCP data.

  • comp1_frac (float) – The fraction of the first anode component.

Returns:

The full cell OCV.

Return type:

NDArray[np.float64]

calculate_dma_parameters(cell_capacity, pe_capacity, ne_capacity, li_inventory)#

Calculate the DMA parameters.

Parameters:

  • pe_stoich_limits (NDArray[np.float64]) – The cathode stoichiometry limits.

  • ne_stoich_limits (NDArray[np.float64]) – The anode stoichiometry limits.

  • pe_capacity (NDArray[np.float64]) – The cathode capacity.

  • ne_capacity (NDArray[np.float64]) – The anode capacity.

  • li_inventory (NDArray[np.float64]) – The lithium inventory.

  • cell_capacity (ndarray[Any, dtype[float64]])

Returns:

The SOH, LAM_pe, LAM_ne, and LLI.

Return type:

Tuple[float, float, float, float]

average_OCV_curves(charge_SOC, charge_OCV, charge_current, discharge_SOC, discharge_OCV, discharge_current)#

Average the charge and discharge OCV curves.

Parameters:

  • charge_capacity (NDArray[np.float64]) – The charge capacity data.

  • charge_OCV (NDArray[np.float64]) – The charge OCV data.

  • discharge_capacity (NDArray[np.float64]) – The discharge capacity data.

  • discharge_OCV (NDArray[np.float64]) – The discharge OCV data.

  • charge_SOC (ndarray[Any, dtype[float64]])

  • charge_current (ndarray[Any, dtype[float64]])

  • discharge_SOC (ndarray[Any, dtype[float64]])

  • discharge_current (ndarray[Any, dtype[float64]])

Returns:

An average between the charge and discharge OCV curves.

Return type:

Tuple[NDArray[np.float64], NDArray[np.float64]]

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