An open standard for physics-based lithium-ion (Li-ion) battery models has been launched by The Faraday Institution. The Battery Parameter eXchange (BPX) defines the battery parameters, the equations that use the parameters, and the reporting of experimental measurements used to validate the reported parameters.

The BPX standard additionally supports inclusion of experimental data used to justify the reported parameter values. Parameters are stored in an easily readable and shareable JSON file format. To enable rapid adoption, tools to parse and validate BPX formatted files are provided in the BPX GitHub repository.Source: The Faraday InstitutionSource: The Faraday Institution

BPX is designed to reduce costs and time-to-market through a common definition of physics-based battery models that can be used widely across industry. The standard 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.

Two Li-ion cells, currently available on the open market and that have been professionally parameterized, 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.
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