# Parameters **URL:** https://pybamm.discourse.group/c/pybamm-qa/parameters/9.md [Latest](https://pybamm.discourse.group/latest.md) · [Categories](https://pybamm.discourse.group/categories.md) · [Tags](https://pybamm.discourse.group/tags.md) --- ## [About the Parameters category](https://pybamm.discourse.group/t/about-the-parameters-category/17)
**Author:** [@pybamm](https://pybamm.discourse.group/u/pybamm)\ **Replies:** 0\ **Last updated:** [7 November 2024 09:55 UTC](https://pybamm.discourse.group/t/about-the-parameters-category/17 "2024-11-07T09:55:34Z")
Subcategory to ask questions about PyBaMM parameters. --- ## [Does this BYD Blade Battery PyBaMM parameter set look physically reasonable?](https://pybamm.discourse.group/t/does-this-byd-blade-battery-pybamm-parameter-set-look-physically-reasonable/474)
**Author:** [@Pengie](https://pybamm.discourse.group/u/Pengie)\ **Replies:** 0\ **Last updated:** [10 July 2026 12:44 UTC](https://pybamm.discourse.group/t/does-this-byd-blade-battery-pybamm-parameter-set-look-physically-reasonable/474 "2026-07-10T12:44:22Z")
I’m creating a custom PyBaMM parameter set for a BYD Blade LFP cell by combining Chen2020, O’Kane lithium plating, Prada2013 LFP chemistry, and published Blade teardown geometry. Does this approach and parameter set look… --- ## [Particle radius from microstructure data using total volume and total surface area](https://pybamm.discourse.group/t/particle-radius-from-microstructure-data-using-total-volume-and-total-surface-area/466)
**Author:** [@amir](https://pybamm.discourse.group/u/amir)\ **Replies:** 0\ **Last updated:** [11 April 2026 14:13 UTC](https://pybamm.discourse.group/t/particle-radius-from-microstructure-data-using-total-volume-and-total-surface-area/466 "2026-04-11T14:13:38Z")
Hello, I am parameterising a DFN model in PyBaMM using microstructure data. From the segmented image I can compute the positive electrode active material volume fraction (\\epsilon\_s = V\_{AM} / V\_{electrode}) and the act… --- ## [Implementing fitted stoichiometry windows from half-cell OCPs for a multilayer 65 Ah pouch cell in PyBaMM](https://pybamm.discourse.group/t/implementing-fitted-stoichiometry-windows-from-half-cell-ocps-for-a-multilayer-65-ah-pouch-cell-in-pybamm/449)
**Author:** [@Notslytherin](https://pybamm.discourse.group/u/Notslytherin)\ **Replies:** 0\ **Last updated:** [5 March 2026 12:39 UTC](https://pybamm.discourse.group/t/implementing-fitted-stoichiometry-windows-from-half-cell-ocps-for-a-multilayer-65-ah-pouch-cell-in-pybamm/449 "2026-03-05T12:39:24Z")
Dear pybamm users, I performed a cell teardown on a 65 Ah NMC–graphite pouch cell in order to obtain the half-cell OCP curves of the electrodes. The pouch cell consists of 62 double-coated layers (31 anodes and 31 catho… --- ## [Investigating Parameter Adjustments for Observing Degradation Effects in PyBaMM](https://pybamm.discourse.group/t/investigating-parameter-adjustments-for-observing-degradation-effects-in-pybamm/425)
**Author:** [@squirrel](https://pybamm.discourse.group/u/squirrel)\ **Replies:** 1\ **Last updated:** [19 December 2025 07:36 UTC](https://pybamm.discourse.group/t/investigating-parameter-adjustments-for-observing-degradation-effects-in-pybamm/425 "2025-12-19T07:36:49Z")
Hi everyone! I’m using PyBaMM to study the impact of a fixed charging strategy under long-term degradation. From my understanding, degradation increases the interfacial resistance, which should lead to higher voltage an… --- ## [Time-dependent parameter functions (e.g. diffusivity and reaction rate from measurement data)](https://pybamm.discourse.group/t/time-dependent-parameter-functions-e-g-diffusivity-and-reaction-rate-from-measurement-data/426)
**Author:** [@thegialeo](https://pybamm.discourse.group/u/thegialeo)\ **Replies:** 3\ **Last updated:** [17 December 2025 18:11 UTC](https://pybamm.discourse.group/t/time-dependent-parameter-functions-e-g-diffusivity-and-reaction-rate-from-measurement-data/426 "2025-12-17T18:11:00Z")
Hi PyBaMM team and community :waving\_hand:, I’m new to PyBaMM, but I’m very interested in the framework and am considering switching to PyBaMM for my modeling work if it can support my use case. In my application, cert… --- ## [Where to obtain parameter for the x-full thermal model](https://pybamm.discourse.group/t/where-to-obtain-parameter-for-the-x-full-thermal-model/375)
**Author:** [@alighato](https://pybamm.discourse.group/u/alighato)\ **Replies:** 0\ **Last updated:** [6 August 2025 18:33 UTC](https://pybamm.discourse.group/t/where-to-obtain-parameter-for-the-x-full-thermal-model/375 "2025-08-06T18:33:39Z")
I am struggling to understand how I would go about getting parameters for this model. I haven’t found a parameter example set in the repo, and also could not map these parameters: 'Negative current collector surface hea… --- ## [Discrepancy in Discharge Capacity Between Chen2020 and Mohtat2020 Parameter Sets Despite Aligned Key Parameters](https://pybamm.discourse.group/t/discrepancy-in-discharge-capacity-between-chen2020-and-mohtat2020-parameter-sets-despite-aligned-key-parameters/320)
**Author:** [@vipulnovo](https://pybamm.discourse.group/u/vipulnovo)\ **Replies:** 1\ **Last updated:** [8 May 2025 10:05 UTC](https://pybamm.discourse.group/t/discrepancy-in-discharge-capacity-between-chen2020-and-mohtat2020-parameter-sets-despite-aligned-key-parameters/320 "2025-05-08T10:05:51Z")
Hello PyBaMM community, I’ve been conducting simulations using both the Chen2020 and Mohtat2020 parameter sets. To ensure consistency, I’ve aligned several key parameters across both sets, including: Maximum and initi… --- ## [Changing Stoichiometry of Individual Electrodes](https://pybamm.discourse.group/t/changing-stoichiometry-of-individual-electrodes/192)
**Author:** [@vipulnovo](https://pybamm.discourse.group/u/vipulnovo)\ **Replies:** 3\ **Last updated:** [15 April 2025 13:18 UTC](https://pybamm.discourse.group/t/changing-stoichiometry-of-individual-electrodes/192 "2025-04-15T13:18:08Z")
Hi everyone, I was wondering if it’s possible to change the stoichiometry of individual electrodes in PyBaMM. Specifically, I’m looking to adjust the stoichiometry for the anode and cathode independently. Is there a way… --- ## [Change parameter function inputs](https://pybamm.discourse.group/t/change-parameter-function-inputs/133)
**Author:** [@derek](https://pybamm.discourse.group/u/derek)\ **Replies:** 5\ **Last updated:** [19 February 2025 14:43 UTC](https://pybamm.discourse.group/t/change-parameter-function-inputs/133 "2025-02-19T14:43:01Z")
I am currently creating a routine for parameter estimation based on experimental data. It would be helpful for me if it was possible to customize the inputs in parameter functions to align with the inputs to my parameter… --- ## [More efficient way to update simulation parameters between runs; Make individual runs faster](https://pybamm.discourse.group/t/more-efficient-way-to-update-simulation-parameters-between-runs-make-individual-runs-faster/180)
**Author:** [@derek](https://pybamm.discourse.group/u/derek)\ **Replies:** 1\ **Last updated:** [19 February 2025 14:30 UTC](https://pybamm.discourse.group/t/more-efficient-way-to-update-simulation-parameters-between-runs-make-individual-runs-faster/180 "2025-02-19T14:30:05Z")
Hi I am using pybamm in a parameter estimation format. In the code below model.full\_routine will call the following equation 1000s of times. current\_interpolant = pybamm.Interpolant(t, I, pybamm.t) param1\["Current funct… --- ## [Domain-sepcific electrolyte parameters](https://pybamm.discourse.group/t/domain-sepcific-electrolyte-parameters/167)
**Author:** [@fmaletic](https://pybamm.discourse.group/u/fmaletic)\ **Replies:** 0\ **Last updated:** [10 February 2025 16:29 UTC](https://pybamm.discourse.group/t/domain-sepcific-electrolyte-parameters/167 "2025-02-10T16:29:06Z")
Hi Everyone! I’d like to have separate electrolyte parameters – mostly diffusivity and conductivity – for each electrode. Is there an easy way to achieve that? --- ## [Current dependent particle radius](https://pybamm.discourse.group/t/current-dependent-particle-radius/62)
**Author:** [@algo-eng](https://pybamm.discourse.group/u/algo-eng)\ **Replies:** 2\ **Last updated:** [9 February 2025 16:50 UTC](https://pybamm.discourse.group/t/current-dependent-particle-radius/62 "2025-02-09T16:50:40Z")
Is there any example python function for current dependent particle radius? What will be the input to the function? --- ## [Is the project pybamm-param still active?](https://pybamm.discourse.group/t/is-the-project-pybamm-param-still-active/144)
**Author:** [@Cade](https://pybamm.discourse.group/u/Cade)\ **Replies:** 2\ **Last updated:** [7 February 2025 21:24 UTC](https://pybamm.discourse.group/t/is-the-project-pybamm-param-still-active/144 "2025-02-07T21:24:45Z")
Hello all, I have been experimenting with the pybamm-param package (GitHub - paramm-team/pybamm-param: Parameter optimisation for PyBaMM.) in hopes of fitting a parameter set to experimental data and am encountering iss… --- ## [What is meaning of electrode density parameter](https://pybamm.discourse.group/t/what-is-meaning-of-electrode-density-parameter/61)
**Author:** [@algo-eng](https://pybamm.discourse.group/u/algo-eng)\ **Replies:** 1\ **Last updated:** [7 February 2025 14:43 UTC](https://pybamm.discourse.group/t/what-is-meaning-of-electrode-density-parameter/61 "2025-02-07T14:43:16Z")
What is the correct way: Total electrode material (active material+conductive+binder) divided by electrode volume ??? Just active material density?? --- ## [Getting cycle number from summary variables](https://pybamm.discourse.group/t/getting-cycle-number-from-summary-variables/108)
**Author:** [@Guri](https://pybamm.discourse.group/u/Guri)\ **Replies:** 1\ **Last updated:** [1 February 2025 23:11 UTC](https://pybamm.discourse.group/t/getting-cycle-number-from-summary-variables/108 "2025-02-01T23:11:22Z")
Hi, Before I was doing sim = pybamm.Simulation(spm, experiment=experiment, parameter\_values=parameter\_values) Solve the model sol = sim.solve() Extract cycle number and discharge capacity cycle\_number = sol.summary\_v… --- ## [Inquiry About Parameters Influencing Negative Electrode Thickness Change in PyBaMM](https://pybamm.discourse.group/t/inquiry-about-parameters-influencing-negative-electrode-thickness-change-in-pybamm/96)
**Author:** [@YULL](https://pybamm.discourse.group/u/YULL)\ **Replies:** 0\ **Last updated:** [8 January 2025 12:32 UTC](https://pybamm.discourse.group/t/inquiry-about-parameters-influencing-negative-electrode-thickness-change-in-pybamm/96 "2025-01-08T12:32:40Z")
Hi PyBaMM Team, I am currently using PyBaMM to simulate a battery with silicon-carbon as the negative electrode material. In my experiment, when the battery charges from 0% SOC to 100% SOC, the thickness of the negative… --- ## [Discrepancy between nominal cell capacity and simulated capacity fade starting point](https://pybamm.discourse.group/t/discrepancy-between-nominal-cell-capacity-and-simulated-capacity-fade-starting-point/83)
**Author:** [@Notslytherin1](https://pybamm.discourse.group/u/Notslytherin1)\ **Replies:** 5\ **Last updated:** [7 January 2025 05:46 UTC](https://pybamm.discourse.group/t/discrepancy-between-nominal-cell-capacity-and-simulated-capacity-fade-starting-point/83 "2025-01-07T05:46:37Z")
I’m encountering an issue with capacity fade simulation in PyBaMM. While my nominal cell capacity is set to 45 Ah, the capacity fade curve starts at approximately 1.8 Ah. Additionally, I’d like to know if it’s possible … --- ## [Defining Diffusion Coefficient as a function of SOC](https://pybamm.discourse.group/t/defining-diffusion-coefficient-as-a-function-of-soc/27)
**Author:** [@brosaplanella](https://pybamm.discourse.group/u/brosaplanella)\ **Replies:** 1\ **Last updated:** [13 November 2024 14:34 UTC](https://pybamm.discourse.group/t/defining-diffusion-coefficient-as-a-function-of-soc/27 "2024-11-13T14:34:56Z")
This topic has been transferred from Github discussions. I have a relation between diffusion coefficient of electrodes wrt SOC. Can we provide it as an input in pybamm model? --- ## [How can I change the exchange current density?](https://pybamm.discourse.group/t/how-can-i-change-the-exchange-current-density/18)
**Author:** [@brosaplanella](https://pybamm.discourse.group/u/brosaplanella)\ **Replies:** 1\ **Last updated:** [7 November 2024 10:00 UTC](https://pybamm.discourse.group/t/how-can-i-change-the-exchange-current-density/18 "2024-11-07T10:00:23Z")
This topic has been transferred from Github discussions. How can I change the reaction exchange current density in my parameter set?