Modelling

The modelling of any battery pack will cover the electrical-thermal performance attributes of the cells. This mathematical modelling is likely to initially be a simple spreadsheet based model, then over time as the data and requirements mature so will the model.

This page is ordered as:

Materials => Cell Assembly => Cells => Modules => Pack => In Use => Recycling

Cell Manufacturing Models

Impact of Formulation and Slurry Properties on Lithium-ion Electrode Manufacturing
Impact of Formulation and Slurry Properties on Lithium-ion Electrode Manufacturing

The combination of materials in the electrodes, including the active material, conductive additive, and binders, plays a crucial role in determining the characteristics and performance of LIBs.

Cell Design Models

Cell Analysis and Modelling System (CAMS)

CAMS was designed to rapidly assess the potential energy density of different cell chemistries and cell formats. The model could also be used as an educational tool to demonstrate how different cell components affect the energy density of the cell, and how the energy density of low TRL level electrode active materials would translate at an applicable scale. Case studies gives examples of how this tool could be used.

Cell Electro-Thermal Models

Battery Cell Modelling

By conducting experiments to measure the battery voltage at various SoCs and temperatures it is possible to develop phenomenological models that relate the applied current and the voltage. An equivalent circuit model (ECM) is one such phenomenological model most widely used in industry to simulate the voltage response for subsequent Battery Management System control and state estimation.

Modelling Thermal Runaway

A complex model that needs to take into account: thermal, electrical, chemical reaction, gas flow, particle ejection, mechanical failure and combustion.

thermal runaway model
Thermal Runaway Modeling and Calibration of an LFP Battery Cell

Build up of a thermal runaway model of an LFP cell and comparison to an ARC test.

Modelling Groups of Cells

digital twin poster
Digital Twin of a Battery Module

The capacity and resistance differences of cells amplify the inhomogeneity at a system level and results in accelerated aging and degradation.

For the module design, where many cells are in parallel, the BMS typically does not have access to individual cell currents and temperatures.

We aim to predict current, state of health and temperature of each cell in the module (or pack) via modelling the interaction between cell and busbar and weld quality.

Modelling Software

There are lots of packages available to model the electrochemistry, cell, module and pack level at electrical, thermal, mechanical, safety, control and even at the atomistic electrochemical level. We have listed the different packages available in a table so that you can search, sort and download it.

Battery Calculations Workbook

The Battery Calculations Workbook is a Microsoft Excel based download that has a number of sheets of calculations around the theme of batteries.

The Pack Sizing sheet gives you a simple way to estimate the nominal power capability of a battery pack.

Simple to use with estimates that get you into the right ballpark.

Pack Models

Tesla fast charge thermal model building on open source data and a siemens model
Tesla Model 3 Fast Charge Model

Building on the Tesla fast charge thermal model that was discussed in the Siemens post: Race to the clouds: Battery thermal behavior simulation of a Tesla Model 3.

This article looks at the cooling system and impact of a change in cooling direction. Starting with the model and the original Fast Charge Scenario.