Hydrogen sensors for BMS thermal runaway detection

Hydrogen sensors for BMS thermal runaway detection

New Products |
By Jean-Pierre Joosting

Posifa Technologies has released a new sensor for detecting thermal runaway in battery management systems (BMS).The sensors are extremely small and available in many different form factors.

Built on the company’s MEMS hydrogen sensor technology, the new PGS4100 hydrogen sensors accurately detect hydrogen concentration in the air by measuring the change in thermal conductivity of the gas mixture within BMS compartments. This technology enables faster reaction times for triggering battery failure alarms in electric vehicles (EVs), ensuring compliance with safety standards.

PGS4100 hydrogen sensors are designed with a relative humidity sensor and a barometric pressure sensor. This strategic incorporation enables the sensor to counterbalance thermal conductivity changes influenced by humidity in air and elevation changes, enhancing the accuracy of hydrogen concentration measurement. This level of precision enables the PGS4100 to meet industry standards for flammable gas detection.

Built around Posifa’s second-generation thermal conductivity die and packaged in an SMD form factor, the PGS4100 operates using a pulsed waveform. This design approach ensures the sensor’s heater temperature aligns closely with the ambient temperature, thereby ensuring intrinsic safety.

The PGS4100 series supports analog voltage and I2C digital outputs, with future models slated to support MODBUS/UART and CAN bus. Encased in an IP6K9 compliant enclosure and equipped with a wire harness terminated with an automotive-grade connector, the PGS4100 hydrogen sensors exemplify durability.

Key features of the PGS4100 series hydrogen sensors include compensation for humidity and pressure, ensuring accurate functioning in harsh environments. Notably, the sensor remains non-reactive to “poisons” or contaminants, guaranteeing long-term stability and reliable performance.

“Because of the extremely small size of the sensor element and its straightforward principle of operation, Posifa’s hydrogen sensing technology can be offered in many different form factors and adapted to a very wide range of OEM requirements,” said Peng Tu, president and CEO of Posifa Technologies. “We have the manufacturing expertise and resources to deliver hydrogen sensing at various levels of modular integration. Our technology can thus, for example, be integrated into any type of battery pack irrespective of ventilation technology, communication protocol, and so forth.”


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