foxBMS 2 version 1.12.0 available

We are happy to announce that you can now get the minor release of foxBMS 2 version 1.12.0 on GitHub.

Highlights

Simplified Configuration System

The new BMS configuration system organizes settings under conf/bms in JSON files, including the SOC and SOE lookup tables. During the build, foxBMS generates the battery-cell, battery-system and diagnosis C configuration files from those JSON definitions. In addition, validation catches incorrectly typed values early.

Separated Measurement Processing

This release separates measurement validation from BMS control logic. To support that change, the new BMS Values module prepares cell and pack measurements and calculates cell-voltage and temperature statistics using valid measurements only. Additionally, dedicated plausibility checks cover current, power, voltage and temperature measurements, including freshness where applicable. Redundant cell-voltage and temperature measurements are optional; by default, the system does not require them.

Build Toolchain and Unit Testing

This release also improves the build toolchain. With Waf, developers can now build embedded unit tests directly, which significantly speeds up the process.

New Features and Diagnostics

The ADI AFE driver now supports temperature-sensor multiplexing. Furthermore, this release adds FRAM-backed tuning values and offset/gain calibration via CAN, support for the TDK B57334V5103F360 NTC thermistor, and a GUI for editing diagnosis-array settings in JSON configuration files. It also expands the documentation with topics such as BMS measurement processing, CAN communication and multi-string SPI configuration.

Dependency Updates

As usual, this release includes the quarterly update of internal and external tools.

For details on updating dependencies, see the installation documentation.

Condensed Changelog

This release

• separates measurement validation from BMS control logic and adds dedicated plausibility checks; redundant cell-voltage and temperature measurements are now optional and disabled by default,
• introduces JSON-based BMS configuration under conf/bms, including SOC and SOE lookup tables; the build generates the corresponding C configuration files,
• adds temperature-sensor multiplexing for the ADI AFE driver, FRAM-backed tuning values, offset/gain calibration via CAN and support for a new NTC thermistor,
• adds a GUI for editing diagnosis-array settings, new CAN and FTASK embedded unit tests, and improved unit-test build support with GCC,
• refactors the build toolchain, including improved compiler detection, TI ARM CGT support and renamed build commands,
• expands documentation for measurement processing, CAN communication and multi-string SPI configuration,
• improves BMS behavior and reliability, including fixes for state-of-charge and state-of-energy calculations, FRAM initialization, CAN message handling and Windows test-variant builds,
• updates internal and external dependencies.

For a detailed list of changes in foxBMS 2 version 1.11.0, please refer to our changelog.

We publish major software releases for our open source BMS platform every 3 to 6 months and interim bug fixes when solved in the News section. By subscribing to the foxBMS Newsletter, you will be informed when the new releases are available. Further, the foxBMS Roadmap and the Documentation are also updated regularly.

Warning: The foxBMS 2 platform including the foxBMS 2 hardware and the foxBMS 2 software are under permanent development. The free and open research and development platform foxBMS 2 as presented in the documentation hereafter is not provided to be used without any adaptions (e.g., to fulfill mandatory regulations) in consumer products, electric vehicles, production environments or any similar usages: the open source version of the foxBMS 2 platform is only intended to be used by skilled professionals trained in designing battery system prototypes.

In case you encounter problems, please contact us.

The Fraunhofer IISB foxBMS Team