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Version 1.1.1 of the Battery Parameter eXchange (BPX) open standard has been released

Posted on 09/06/2026

Download the latest version today

The Battery Parameter eXchange (BPX) Standard has released a new version, introducing a range of updates designed to make physics-based lithium-ion battery model definition and exchange even clearer and more efficient.

The latest release includes several important enhancements:

  • New Section 5: Summary Model Content Matrix providing a concise overview of model requirements and content.
  • Clarified JSON syntax in Section 6 for multi-material electrodes, helping users implement models with greater consistency.
  • Updated Table 3 to reflect corrected syntax examples.
  • Updated Table 2 to identify parameters that are only required when a thermal model is included.
  • A series of minor clarifications and corrections throughout the document.

BPX is an open standard for physics-based lithium-ion battery models, developed to reduce costs and streamline battery model supply chains by providing a common definition of battery modelling parameters that can be used across the industry.

As battery technologies continue to evolve, the need for efficient data exchange and model interoperability has never been greater. BPX provides a common language that enables battery developers, researchers, software providers and end users to collaborate more effectively, reducing duplication of effort and accelerating innovation.

Organisations adopting BPX can benefit from:

  • Improved information flow across the battery industry
  • Reduced development costs and faster time to market
  • Greater interoperability between modelling tools and organisations
  • Enhanced innovation through open and consistent model definitions

Whether you are a researcher, battery engineer, modelling specialist or research manager working within an industrial organisation, BPX can help simplify the management and exchange of battery model information.

Download the latest version today and learn more about the benefits of BPX

Accelerating EV Battery Innovation at JLR with the Battery Parameter eXchange Standard

Posted on 27/05/2026

Version 1.1 of the Battery Parameter eXchange (BPX) open standard has been released

Posted on 26/02/2026

Download it today

Check out the new features:

  • Model extensions: BPX 1.1 adds explicit support for the SPMe, a one-state hysteresis model, and support for composite electrodes, such as graphite/silicon blends.
  • Degradation: Users of BPX can now specify a degradation state – loss of (accessible) active material (LAM) and loss of (cyclable) lithium inventory (LLI) – enabling the communication of aged cell parameters.
  • Cell state: a new “cell state” has been added to specify the initial state-of-charge, state-of-health, and thermal environment for a specific experiment, improving clarity on how properties relate to a cell or experiment.

BPX is an open standard for physics-based lithium-ion battery models that has been developed to reduce costs and streamline battery model supply chains through a common definition of battery modelling parameters that can be used widely across industry.

So if you’re a researcher or research manager developing batteries for an industry organisation and don’t yet know about BPX, check how it can benefit companies large and small www.bpxstandard.com:

🔋 enabling information flow across the battery industry
📉 reducing cost and time to market, and
💡 stimulating innovation

LF Energy Battery Data Alliance Announces the Battery Data Format (BDF): A New Open Standard for Battery Data Interoperability

Posted on 22/12/2025

Leading automakers and battery development organisations form Steering Group for Battery Parameter eXchange battery modelling standard

Posted on 03/07/2025

BPX version 1.0 available for download

HARWELL, UK (3 July 2025) Representatives from five leading European organisations: AVL, BMW Group, Fortescue ZERO, SINTEF and TNO, will form the Battery Parameter eXchange (BPX) Steering Group, which will also include UK battery start-ups and Faraday Institution researchers.

The Battery Parameter eXchange (BPX) is an open standard for physics-based lithium-ion battery models that has been developed to reduce costs and streamline battery model supply chains through a common definition of physics-based battery modelling parameters that can be used widely across industry.

The Steering Group comprises experienced battery modellers from a wide range of leading companies and research institutions that will advise the Faraday Institution on strategy for the future evolution of the BPX standard, including review of the feature roadmap. In doing so they will ensure the needs of industrial users will continue to be met as battery modelling technologies advance and industrial needs evolve. They will encourage the use of the BPX standard within their own organisations and across the wider industry.

Edwin Knobbe, BMW Group commented: “BMW Group is pleased to be supporting the development of battery modelling standards to mature industry’s use of modelling tools towards cost and efficiency gains.

Tom Maull, Fortescue ZERO commented: “To increase the speed of innovation in the battery modelling community, industry and academia need to speak the same language. We’re pleased to play a leading role in this endeavour.”

The Steering Group comprises:

  • Dr Simon Clark, Senior Research Scientist, SINTEF (Norway) one of Europe’s leading independent research organisations, and lead developer of the BattINFO ontology.
  • Dr Edmund Dickinson, Head of Electrochemistry, About:Energy, a battery technology company accelerating electrification with precise cell data and advanced simulation tools.
  • Professor David Howey, Department of Engineering Science, University of Oxford and Co-investigator on the Faraday Institution’s Multi-Scale Modelling project.
  • Dr Edwin Knobbe, BMW Group (Germany).
  • Dr Ivan Korotkin, Southampton University, Lead Developer of DandeLiion.
  • Tom Maull, Technical Strategy Manager, Elysia – Battery Intelligence from Fortescue (formerly WAE), a leading battery intelligence software offering based in the UK.
  • Dr Robert Timms, Co-founder & CTO, Ionworks, a start-up battery simulation software platform from the creators of PyBaMM.
  • Dr Robert Triebl, Simulation Software Development Engineer, AVL (Austria) – a leading mobility technology company for development, simulation and testing in the automotive industry.
  • Dr Steven Wilkins, Senior Research Scientist, TNO, The Netherlands Organisation for Applied Scientific Research.

A new version of BPX has just been released that includes updates to:

  • Definition of a specific supported equation set for single particle models with electrolyte.
  • Support for a general single-state hysteresis model.
  • Support for thermodynamic degradation modes.
  • Dedicated section for “initial state” parameters.
  • More flexibility in user defined parameters.
  • Use of partial BPX files.
  • Larger set of allowed operations.

Download BPX version 1.0

BPX v0.4 has been available since December 2023, with 330+ people downloading the standard to date. In October 2024, following detailed industry engagement, an accompanying parameter descriptions document containing detailed and practical descriptions of how to measure the parameters defined in the standard was published.

The standard has been conceived and developed by the Faraday Institution and developed by a small team largely drawn from the PyBaMM and DandeLiion modelling communities, supported as part of the Faraday Institution’s Multi-Scale Modelling project. Two members of the Steering Group – Ionworks and About:Energy – are closely aligned with modelling project and were both Faraday Institution Entrepreneurial Fellows.

In the short and medium term, the Faraday Institution will continue to fund the development of the BPX standard as part of its commercialisation activities from its research programmes. In the longer term it is anticipated that BPX will evolve to become a membership-funded standards development organisation, led by an executive board of fee-paying members with the steering group evolving to become a technical advisory board.

The Faraday Institution is a delivery partner for the Battery Innovation Programme, supporting the UK’s advancement in batteries—designated as a ‘frontier industry’ within the Advanced Manufacturing Sector Plan of the UK’s Industrial Strategy.

Get involved

The Faraday Institution welcomes approaches from industry organisations wishing to get involved with the BPX development process. To do so please contact Pete Keevill.

All battery modellers are invited to request additional features to be included in BPX via discussions boards in GitHub. The Steering Group will consider these requests and decide which to include in future versions to drive the standard forward.

Notes to Editors

About the Faraday Institution

The Faraday Institution is the UK’s independent institute for electrochemical energy storage research, skills development, market analysis, and early-stage commercialisation. Bringing together expertise from universities and industry, the Faraday Institution endeavours to make the UK the go-to place for the research and development of new electrical storage technologies for both the automotive and wider relevant sectors. Headquartered at the Harwell Science and Innovation Campus, the Faraday Institution is a registered charity with an independent board of trustees, and a delivery partner for the Battery Innovation Programme (formerly the Faraday Battery Challenge).

For more information on the Faraday Institution, visit www.faraday.ac.uk and follow Faraday Institution on LinkedIn.

The Battery Innovation Programme is supported by Innovate UK. The Programme is making the UK a science and innovation superpower for batteries, supporting the UK’s world-class battery facilities along with growing innovative businesses that are developing the battery supply chain for our future prosperity. Its aim is to build a high-tech, high-value, high-skill battery industry in the UK. Find out more.

 

Watch the technical deep-dive webinar held on 11th January 2023

Posted on 11/01/2023

Watch the technical deep-dive webinar held on 11th January 2023 as the authors of BPX describe the details of the battery modelling standard and how to use it to unlock the benefits of physics-based modelling for your organisation.

The presenting team:

Dr Robert Timms – University of Oxford / Faraday MSM project
Dr Edmund Dickinson – About:Energy
Dr Jamie Foster – University of Portsmouth / Faraday MSM project
Dr Ivan Korotkin – University of Southampton / Faraday MSM project

Topics covered include:

  • What is a physics-based model?
  • Measuring physical cells to extract model parameters
  • The value of JSON file format for BPX
  • Using BPX with PyBaMM and DandeLiion battery modelling simulators
  • Panel Discussion: What next for BPX?
  • Q&A

Watch now

Faraday Institution launches first physics-based battery modelling standard

Posted on 07/12/2022

Battery Parameter eXchange (BPX) standard – an initiative to provide a common language to enable accurate battery modelling and reduce costs and time-to-market for industry

HARWELL, UK (7 December 2022) The Faraday Institution has today launched the Battery Parameter eXchange (BPX), an open standard for physics-based lithium-ion battery models. The standard defines the battery parameters, the equations that use the parameters, and the reporting of experimental measurements used to validate the reported parameters.

Physics-based battery models can deliver accuracy and insight into long-term performance in a wide range of scenarios. However, the complexity of physics-based models and lack of a common definition has limited their use to specialist teams within large companies, each creating their own modelling schemes that are difficult to compare with those of other companies.

The purpose of BPX is to reduce costs and time-to-market through a common definition of physics-based battery models that can be used widely across industry. BPX will make it easier for manufacturers and developers of all sizes to leverage the accuracy of physics-based models in a broad range of scenarios, which will reduce costs and stimulate innovation.

Professor Pam Thomas, Chief Executive Officer, Faraday Institution said: “To meet the growing speed of change and demand from industry and society, improvements need to be made to battery performance, longevity, sustainability and safety. Years of advanced model development, a five-year investment in our Multi-scale Modelling Project, and the spin out of About:Energy sit behind the BPX standard. Its introduction will both speed up design and development cycles and reduce the need for expensive physical prototyping.

Rob Millar, Head of Electrical, WAE, said: “Cutting-edge automotive consulting and design is a heritage UK strength that is currently undergoing transformation with the global switch to electrification. We believe physics-based battery modelling has a valuable role to play in accelerating this change and the BPX initiative supports the industry drive for improved battery performance, longevity, sustainability and safety.”

Professor Gregory Offer, Imperial College London, said: “Design of an optimal battery system for a particular application demands a deep understanding of battery performance under a wide range of conditions. The physics-based model codified in the BPX standard makes that knowledge and understanding more available for engineers to solve real world problems. Making that knowledge widely available is a powerful enabler for the optimisation of lithium-ion technology and its successors.”

Industry standards require maintenance and a clear technical, commercially informed roadmap. To this end the Faraday Institution is exploring the development of a Faraday Standards Forum, an industry/research partnership that could be launched in 2023 and that could own the roadmap for the maintenance and development of BPX.

Want to know more / get involved?

· Attend the high-level webinar, Delivering “Industrial Strength” Physics-based Battery Modelling, 2 pm, 7th December 2022. To register email: bpx@faraday.ac.uk

· Attend a “deep-dive” follow up briefing for industry organisations: 2pm, 11th January 2023. Interested? Email: bpx@faraday.ac.uk · Visit the BPX website and download the standard. · Download Faraday Insight 15: The Value of Modelling for Battery Development and Use

-Ends-

 

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About the Faraday Institution

The Faraday Institution is the UK’s independent institute for electrochemical energy storage research, skills development, market analysis, and early-stage commercialisation. Bringing together expertise from universities and industry, the Faraday Institution endeavours to make the UK the go-to place for the research and development of new electrical storage technologies for both the automotive and wider relevant sectors. Headquartered at the Harwell Science and Innovation Campus, the Faraday Institution is a registered charity with an independent board of trustees.

 

The Faraday Battery Challenge at UK Research and Innovation (UKRI) is delivered by Innovate UK. It is making the UK a science and innovation superpower for batteries, supporting the UK’s world-class battery facilities along with growing innovative businesses that are developing the battery supply chain for our future prosperity. Its aim is to build a high-tech, high-value, high-skill battery industry in the UK.

UK Research and Innovation (UKRI) is the largest public funder of research and innovation in the UK, with a budget of around £8bn. It is composed of seven disciplinary research councils, Innovate UK and Research England.

We operate across the whole country and work with our many partners in higher education, research organisations businesses, government, and charities.

Our vision is for an outstanding research and innovation system in the UK that gives everyone the opportunity to contribute and to benefit, enriching lives locally, nationally and internationally.

Our mission is to convene, catalyse and invest in close collaboration with others to build a thriving, inclusive research and innovation system that connects discovery to prosperity and public good. www.ukri.org

 

About the Faraday Institution Multi-scale Modelling Project

The Faraday Institution’s Multi-scale Modelling Project is a £17.9 million project led by Imperial College London, and involving eight other universities and 30+ industry partners. Through the project, world-leading battery experts with a broad set of skills are building a critical bridge between science and engineering. The project is delivering a portfolio of world-leading research, methodology development and modelling tools (including PyBaMM and DandeLiion) that are of strategic importance for the UK.

About About:Energy

About:Energy was founded in 2021 with a mission to accelerate the electrification transition. We equip organisations with the tools needed to streamline the development of new battery technologies, reducing time to market and R&D spend. Our proprietary characterisation and modelling capabilities provide industry access to leading research in the UK to enhance battery design and operation. Headquartered in London, About:Energy has partnered with organisations across the automotive, manufacturing and aerospace industries to solve challenges in battery selection, engineering, charging, lifetime prediction, and recyclability. About:Energy has provided two cell parameterisation examples to demonstrate the use of the BPX standard.
https://www.aboutenergy.io/