# Latest **URL:** https://pybamm.discourse.group/latest.md [Latest](https://pybamm.discourse.group/latest.md) · [Categories](https://pybamm.discourse.group/categories.md) · [Tags](https://pybamm.discourse.group/tags.md) --- ## [Welcome to PyBaMM! 👋](https://pybamm.discourse.group/t/welcome-to-pybamm/5)
**Author:** [@system](https://pybamm.discourse.group/u/system)\ **Replies:** 0\ **Last updated:** [6 September 2024 03:06 UTC](https://pybamm.discourse.group/t/welcome-to-pybamm/5 "2024-09-06T03:06:32Z")
We are so glad you joined us. PyBaMM A place to discuss and ask questions about PyBaMM and its ecosystem. Here are some things you can do to get started: :speaking\_head: Introduce yourself by adding your picture and… --- ## [Starting times between cycles](https://pybamm.discourse.group/t/starting-times-between-cycles/484)
**Author:** [@geri](https://pybamm.discourse.group/u/geri)\ **Replies:** 5\ **Last updated:** [24 September 2026 18:40 UTC](https://pybamm.discourse.group/t/starting-times-between-cycles/484 "2026-09-24T18:40:01Z")
Hello, everyone! I’m relative new to Pybamm. I’m working on a parallel-in-time methods. I’ve noticed some differences in the starting times in the solution of an experiment with more than 1 cycle. Here is a small examp… --- ## [How can I pause a PyBaMM experiment at fixed simulated-time intervals, update ECM parameters, and resume from the same point in the experiment?](https://pybamm.discourse.group/t/how-can-i-pause-a-pybamm-experiment-at-fixed-simulated-time-intervals-update-ecm-parameters-and-resume-from-the-same-point-in-the-experiment/482)
**Author:** [@Ivan](https://pybamm.discourse.group/u/Ivan)\ **Replies:** 1\ **Last updated:** [24 September 2026 11:59 UTC](https://pybamm.discourse.group/t/how-can-i-pause-a-pybamm-experiment-at-fixed-simulated-time-intervals-update-ecm-parameters-and-resume-from-the-same-point-in-the-experiment/482 "2026-09-24T11:59:54Z")
I am simulating a Thevenin equivalent circuit model using pybamm.Experiment. I want to update some model parameters periodically during the simulation—for example, every 100 simulated seconds. The intended workflow is: … --- ## [Core Temperature data?](https://pybamm.discourse.group/t/core-temperature-data/481)
**Author:** [@Sanchi](https://pybamm.discourse.group/u/Sanchi)\ **Replies:** 0\ **Last updated:** [26 August 2026 19:19 UTC](https://pybamm.discourse.group/t/core-temperature-data/481 "2026-08-26T19:19:05Z")
Hi everyone. I am trying to generate core temperature data. Is there any way to extract core temperature data from DFN/SPM models? --- ## [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… --- ## [Oxygen Diffusion submodel](https://pybamm.discourse.group/t/oxygen-diffusion-submodel/216)
**Author:** [@Salah](https://pybamm.discourse.group/u/Salah)\ **Replies:** 3\ **Last updated:** [10 July 2026 11:07 UTC](https://pybamm.discourse.group/t/oxygen-diffusion-submodel/216 "2026-07-10T11:07:17Z")
hello, can someone help me with my code i tried several ways to plot the Oxygen concentration but have’nt succed \`import pybamm model = pybamm.lithium\_ion.DFN() Set up the oxygen diffusion submodel oxygen\_diffusion … --- ## [Possible Bug or just my usecase? Memory growth out of bounds](https://pybamm.discourse.group/t/possible-bug-or-just-my-usecase-memory-growth-out-of-bounds/473)
**Author:** [@Xamroh](https://pybamm.discourse.group/u/Xamroh)\ **Replies:** 0\ **Last updated:** [4 July 2026 13:33 UTC](https://pybamm.discourse.group/t/possible-bug-or-just-my-usecase-memory-growth-out-of-bounds/473 "2026-07-04T13:33:56Z")
Hello! I found this rapid memory growth in my simulation but i am not quite sure if its a bug of missing garbage collection or just my usecase that calculates unused results. Recreation and diagnostic in small a exampl… --- ## [Is CV Event trigger event necessary for drive cycle data?](https://pybamm.discourse.group/t/is-cv-event-trigger-event-necessary-for-drive-cycle-data/472)
**Author:** [@ShubhamB](https://pybamm.discourse.group/u/ShubhamB)\ **Replies:** 0\ **Last updated:** [1 July 2026 13:47 UTC](https://pybamm.discourse.group/t/is-cv-event-trigger-event-necessary-for-drive-cycle-data/472 "2026-07-01T13:47:03Z")
Suppose i have done parameter optimization for LFP A123M1B cell using prada2013 set using global search optimsers PSO, DE. So my question is if a drive cycle experimental data has CV stages in middle do I need to trigger… --- ## [Interactive Plot Not Updating](https://pybamm.discourse.group/t/interactive-plot-not-updating/471)
**Author:** [@ropaul](https://pybamm.discourse.group/u/ropaul)\ **Replies:** 0\ **Last updated:** [22 June 2026 01:13 UTC](https://pybamm.discourse.group/t/interactive-plot-not-updating/471 "2026-06-22T01:13:29Z")
I just started using PyBamm and was following a tutorial, but my graphs don’t update when I move the slider as in the tutorial. The code I ran is below. I’m running this using Juptyer Notebook with Python 3.13.11 on Cond… --- ## [Simulations with O’Regan 2022 parameter set not working at 2C 0°C, 2C 10°C and WLTP 0°C](https://pybamm.discourse.group/t/simulations-with-o-regan-2022-parameter-set-not-working-at-2c-0-c-2c-10-c-and-wltp-0-c/456)
**Author:** [@ashkal](https://pybamm.discourse.group/u/ashkal)\ **Replies:** 2\ **Last updated:** [17 April 2026 15:32 UTC](https://pybamm.discourse.group/t/simulations-with-o-regan-2022-parameter-set-not-working-at-2c-0-c-2c-10-c-and-wltp-0-c/456 "2026-04-17T15:32:44Z")
Hello, I am working with the O’Regan parameter set to get temperature prediction for LGM50 to compare the predictions with the model that I have developed. I am using this code as the reference: https://docs.pybamm.org… --- ## [How to extract parameter values from a battery?](https://pybamm.discourse.group/t/how-to-extract-parameter-values-from-a-battery/462)
**Author:** [@Jordan354](https://pybamm.discourse.group/u/Jordan354)\ **Replies:** 1\ **Last updated:** [16 April 2026 16:47 UTC](https://pybamm.discourse.group/t/how-to-extract-parameter-values-from-a-battery/462 "2026-04-16T16:47:10Z")
Good Afternoon all, I want to replicate the charge, discharge, and cycle characteristics of a known cell, the Molicel P45B, in PyBaMM. I have their data sheet here. INR21700P45B\_1.2\_Product-Data-Sheet-of-INR-21700-P45B… --- ## [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… --- ## [How to precompute and supply a parameter-dependent 2D boundary lifting field (Robin BCs) in PyBaMM? ](https://pybamm.discourse.group/t/how-to-precompute-and-supply-a-parameter-dependent-2d-boundary-lifting-field-robin-bcs-in-pybamm/464)
**Author:** [@himanshu](https://pybamm.discourse.group/u/himanshu)\ **Replies:** 0\ **Last updated:** [11 April 2026 14:13 UTC](https://pybamm.discourse.group/t/how-to-precompute-and-supply-a-parameter-dependent-2d-boundary-lifting-field-robin-bcs-in-pybamm/464 "2026-04-11T14:13:31Z")
Hi PyBaMM team, I’m working on a custom x-lumped (y–z) thermal submodel for a pouch cell based on a Chebyshev–Galerkin reduced formulation (DOI: doi.org/10.1109/TPEL.2020.3027561). The approach introduces a boundary “li… --- ## [Lithium plating during calendar aging in pybamm model](https://pybamm.discourse.group/t/lithium-plating-during-calendar-aging-in-pybamm-model/453)
**Author:** [@Thiyaga](https://pybamm.discourse.group/u/Thiyaga)\ **Replies:** 2\ **Last updated:** [3 April 2026 13:02 UTC](https://pybamm.discourse.group/t/lithium-plating-during-calendar-aging-in-pybamm-model/453 "2026-04-03T13:02:04Z")
team pybamm, I am simulating calendar aging in PyBaMM for a cell stored at 95% SOC and 40 °C. my model setup is as follows, model = pybamm.lithium\_ion.DFN( { “cell geometry”: “arbitrary”, “thermal”: “lumped”, “SEI… --- ## [Effect of State of Charge on aging](https://pybamm.discourse.group/t/effect-of-state-of-charge-on-aging/98)
**Author:** [@Thiyaga](https://pybamm.discourse.group/u/Thiyaga)\ **Replies:** 4\ **Last updated:** [3 April 2026 13:00 UTC](https://pybamm.discourse.group/t/effect-of-state-of-charge-on-aging/98 "2026-04-03T13:00:20Z")
I am trying to study the effect of SOC on aging. I did a simulation with two SOC limits, 10-50% and 50-90% model = pybamm.lithium\_ion.SPM( { “cell geometry”: “arbitrary”, “thermal”: “lumped”, “SEI”: “solvent-diffus… --- ## [Pybamm discourse group activity](https://pybamm.discourse.group/t/pybamm-discourse-group-activity/455)
**Author:** [@Thiyaga](https://pybamm.discourse.group/u/Thiyaga)\ **Replies:** 0\ **Last updated:** [14 March 2026 07:13 UTC](https://pybamm.discourse.group/t/pybamm-discourse-group-activity/455 "2026-03-14T07:13:28Z")
Hi All, I see there are many questions/queries remain unanswered in the discourse group. Humble request to all members, can anything be done about this so that the group becomes more active and helpful. thanks and rega… --- ## [Discrepancies in OCV-SOC Curves: Comparing Full-Cell Discharge Method vs. Electrode OCP Reconstruction](https://pybamm.discourse.group/t/discrepancies-in-ocv-soc-curves-comparing-full-cell-discharge-method-vs-electrode-ocp-reconstruction/325)
**Author:** [@pkalbhor](https://pybamm.discourse.group/u/pkalbhor)\ **Replies:** 4\ **Last updated:** [5 March 2026 13:31 UTC](https://pybamm.discourse.group/t/discrepancies-in-ocv-soc-curves-comparing-full-cell-discharge-method-vs-electrode-ocp-reconstruction/325 "2026-03-05T13:31:40Z")
I am calculating OCV-SOV curve for full cell from two different methods Using slow discharge expriment Using OCP curves of each electrodes Both are very different as shown in below image. What am I missing here? --- ## [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… --- ## [Size mismatch between variables](https://pybamm.discourse.group/t/size-mismatch-between-variables/448)
**Author:** [@oarcelus](https://pybamm.discourse.group/u/oarcelus)\ **Replies:** 0\ **Last updated:** [5 February 2026 15:56 UTC](https://pybamm.discourse.group/t/size-mismatch-between-variables/448 "2026-02-05T15:56:40Z")
I have a rather basic question about how PyBAMM handles discretizations. From what I understand the gradient of a variable pybamm.grad(c), has shape N-1. Now, if this gradient is to be multiplied by a function parameter… --- ## [Question about grouped parameter models](https://pybamm.discourse.group/t/question-about-grouped-parameter-models/446)
**Author:** [@oarcelus](https://pybamm.discourse.group/u/oarcelus)\ **Replies:** 0\ **Last updated:** [29 January 2026 16:12 UTC](https://pybamm.discourse.group/t/question-about-grouped-parameter-models/446 "2026-01-29T16:12:29Z")
Hello, I am lookin at the grouped parameter model examples provided in PyBOB (PyBOP/pybop/models/lithium\_ion/grouped\_spme.py at develop · pybop-team/PyBOP · GitHub), for both SPM and SPMe models. I have a question about … --- ## [Simulating voltage recovery after discharge](https://pybamm.discourse.group/t/simulating-voltage-recovery-after-discharge/416)
**Author:** [@Thiyaga](https://pybamm.discourse.group/u/Thiyaga)\ **Replies:** 3\ **Last updated:** [29 January 2026 08:30 UTC](https://pybamm.discourse.group/t/simulating-voltage-recovery-after-discharge/416 "2026-01-29T08:30:24Z")
team pybamm, I am modeling discharge/charge behavior of an NMC cell and have issues with modeling voltage recovery. In the test, after discharging at C/5(constant current), there is a rest period of 60 minutes and the v… --- ## [Modifying DFN model to add convection term](https://pybamm.discourse.group/t/modifying-dfn-model-to-add-convection-term/445)
**Author:** [@kate2525](https://pybamm.discourse.group/u/kate2525)\ **Replies:** 0\ **Last updated:** [28 January 2026 21:59 UTC](https://pybamm.discourse.group/t/modifying-dfn-model-to-add-convection-term/445 "2026-01-28T21:59:42Z")
For a cell with electrolyte flow through (axial flow) and connected to a well mixed external tank is it even possible to modify the existing DFN model to introduce the species balance for the external tank and modify th… --- ## [Transient response during low-temperature discharge](https://pybamm.discourse.group/t/transient-response-during-low-temperature-discharge/437)
**Author:** [@MASAKI](https://pybamm.discourse.group/u/MASAKI)\ **Replies:** 2\ **Last updated:** [26 January 2026 08:51 UTC](https://pybamm.discourse.group/t/transient-response-during-low-temperature-discharge/437 "2026-01-26T08:51:52Z")
Hi, Everyone I am currently trying to reproduce the transient response behavior during low-temperature discharge using the DFN model. However, even after adjusting the thermal conductivity and heat capacity parameters,… --- ## [Initial temperature input does not work](https://pybamm.discourse.group/t/initial-temperature-input-does-not-work/435)
**Author:** [@oarcelus](https://pybamm.discourse.group/u/oarcelus)\ **Replies:** 1\ **Last updated:** [23 January 2026 18:42 UTC](https://pybamm.discourse.group/t/initial-temperature-input-does-not-work/435 "2026-01-23T18:42:59Z")
Hi, I have seen this entry on GitHub where PyBamm is used to solve the electrical problem, while the thermal problem is handled in Simulink (GitHub - FaradayInstitution/pybamm\_simulink\_example: An example of how to run p… --- ## [Discrepancy Between “Total heating \[W\]” by PyBaMM and Bernardi Formula in Lumped Thermal Models](https://pybamm.discourse.group/t/discrepancy-between-total-heating-w-by-pybamm-and-bernardi-formula-in-lumped-thermal-models/316)
**Author:** [@kazuma](https://pybamm.discourse.group/u/kazuma)\ **Replies:** 1\ **Last updated:** [23 January 2026 16:45 UTC](https://pybamm.discourse.group/t/discrepancy-between-total-heating-w-by-pybamm-and-bernardi-formula-in-lumped-thermal-models/316 "2026-01-23T16:45:05Z")
Hello, I have some questions regarding the calculation of heat generation in the lumped thermal model. In PyBaMM, the heat generation is calculated using information such as the exchange current density and electrode po… --- ## [How do we use the hysteresis for LFP cathode with single phase Negative electrode](https://pybamm.discourse.group/t/how-do-we-use-the-hysteresis-for-lfp-cathode-with-single-phase-negative-electrode/431)
**Author:** [@Masood](https://pybamm.discourse.group/u/Masood)\ **Replies:** 1\ **Last updated:** [23 January 2026 15:46 UTC](https://pybamm.discourse.group/t/how-do-we-use-the-hysteresis-for-lfp-cathode-with-single-phase-negative-electrode/431 "2026-01-23T15:46:27Z")
Help to implement the hysteresis by telling what needs to be changed specifically with respect to pybamm. where i can find the hysteresis raw code? --- ## [Using pixi as an option to build PyBaMM](https://pybamm.discourse.group/t/using-pixi-as-an-option-to-build-pybamm/443)
**Author:** [@prady0t](https://pybamm.discourse.group/u/prady0t)\ **Replies:** 0\ **Last updated:** [20 January 2026 12:33 UTC](https://pybamm.discourse.group/t/using-pixi-as-an-option-to-build-pybamm/443 "2026-01-20T12:33:28Z")
Are there any ongoing efforts to adopt Pixi for infra (tests, builds, CI, etc)? It might be worth the effort. See: https://pixi.sh/latest/ --- ## [Feasibility of Thermal Calculation Using the Jelly Roll Model](https://pybamm.discourse.group/t/feasibility-of-thermal-calculation-using-the-jelly-roll-model/441)
**Author:** [@Jooo](https://pybamm.discourse.group/u/Jooo)\ **Replies:** 0\ **Last updated:** [20 January 2026 12:33 UTC](https://pybamm.discourse.group/t/feasibility-of-thermal-calculation-using-the-jelly-roll-model/441 "2026-01-20T12:33:20Z")
Hi all I am interested in thermal simulations using PyBaMM and have started by performing thermal calculations with the existing parameter sets. However, based on the results, I realized that these calculations do not c… --- ## [Half-cell model with SEI growth](https://pybamm.discourse.group/t/half-cell-model-with-sei-growth/432)
**Author:** [@oarcelus](https://pybamm.discourse.group/u/oarcelus)\ **Replies:** 0\ **Last updated:** [8 January 2026 14:43 UTC](https://pybamm.discourse.group/t/half-cell-model-with-sei-growth/432 "2026-01-08T14:43:22Z")
Hi, I am wondering how could I implement a SEI growth model in the Li-metal side in a PyBAMM half-cell model. I am not finding a direct way of doing it. Maybe I need to resort to building a custom model? --- ## [DFN model variables](https://pybamm.discourse.group/t/dfn-model-variables/430)
**Author:** [@Fark](https://pybamm.discourse.group/u/Fark)\ **Replies:** 0\ **Last updated:** [6 January 2026 13:34 UTC](https://pybamm.discourse.group/t/dfn-model-variables/430 "2026-01-06T13:34:09Z")
Hi, I would like to understand the difference between “Environment total cooling \[W\]” and “Surface total cooling \[W\]”. Which one is suitable to opt for in case of a lumped thermal model? I am obtaining a flat line when … [Next page](https://pybamm.discourse.group/latest.md?page=1)