BPX standard

BPX builds on the Doyle Fuller Newman (DFN) models, validated and adopted by the Faraday Institution’s Multi-scale Modelling project.

The standard

Battery Parameter eXchange (BPX) is an open standard for physics-based Li-ion battery models that reports the model-specific values of battery parameters within a defined set of equations that use the parameters.

The BPX standard additionally supports inclusion of experimental data used to justify the reported parameter values. Within the standard, parameters are stored in a human-readable, extensible, and easily-shared JSON file format. To enable easy adoption, tools to parse and validate BPX formatted files are provided in the BPX GitHub repository.

Two cells, currently available on the open market and which have been professionally parameterised, have been made available by About: Energy as examples and are included with the standard download. The examples are:

  • NMC_Pouch_cell: Li-ion battery with lithium nickel manganese cobalt (NMC) cathode in equal proportions (NMC-111). This type of cell is widely used in the battery market with high energy density and this particular cell is a pouch configuration.
  • LFP_18650_cell: Li-ion battery with lithium iron phosphate (LFP) cathode in a cylindrical cell 18650 format. This type of cell is becoming much more widely used trading energy density for longer life and greater thermal stability than NMC.

Read more on the benefits of BPX

Using the standard

The Faraday Institution has made the BPX standard freely available to industrial users experienced in the field via this microsite and will continue to work with industry and the research community to improve and evolve the standard.  The Faraday Institution will not assist in, and does not accept any responsibility for, the actual selection and application of the BPX standard by users. All responsibility for selecting, applying, and assessing compliance with the BPX standard lies with the user.

 The BPX standard should only be used by those users who are appropriately experienced, qualified and equipped to do so. It should be applied conscientiously and, where necessary, advice should be taken from others qualified to provide it.

 The Faraday Institution is not liable for any loss or damage whatsoever arising from the misapplication or the use of the BPX Standard by a user.

Download the standard

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