BPX has been developed to reduce costs and time-to-market through a common definition of physics-based battery models that can be used widely across industry.

BPX aims to reduce fragmentation and support interoperability and data exchange. The standard makes it easier for established manufacturers, startups and innovators to access and leverage the insight provided by physics-based models across a broad range of development scenarios.

An open modelling standard

BPX reports the model-specific values of battery parameters within a defined set of equations that use the parameters. The standard defines:

• equations for standard physics-based battery models
• a data format to express all core battery parameters appearing in those equations (including properties of the cell, electrodes, electrolyte, and separator)
• a data format to express user-defined extensions to the core parameter set, for sector- or user-specific tasks
• the reporting of experimental measurements used to validate the reported parameters.

The standard sets out a human-readable, extensible, and easily-shared JSON file format describing the parameters that can be used for Doyle-Fuller-Newman (DFN), single particle models (SPM) and single particle models with electrolyte (SPMe) and is designed to be portable between different simulators.

BPX is based on the DFN model and the specific form of that model expressed by the standard is the outcome of a comprehensive review of the state-of-the-art delivered by the Faraday Institution Multi-Scale Modelling research programme.

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