A Flexible 8-in-1 Microsensor Embedded in Proton Battery Stack for Real-Time Microscopic Measurements

Area of Science:

• Materials Science and Engineering
• Sensor Technology
• Electrochemistry

Background:

• Simultaneous, accurate measurement of multiple physical parameters within proton battery stacks is challenging due to limitations of external or single-point sensors.
• Interrelated parameters such as oxygen, clamping pressure, hydrogen, voltage, current, temperature, flow, and humidity significantly impact proton battery performance, lifespan, and safety.

Purpose of the Study:

• To develop an integrated microsensor capable of real-time, in-situ measurement of multiple critical physical parameters within a proton battery stack.
• To overcome the limitations of current monitoring techniques and enhance the understanding of proton battery operational dynamics.

Main Methods:

• Utilized micro-electro-mechanical systems (MEMS) technology to develop micro oxygen and clamping pressure sensors.
• Integrated these sensors into a 6-in-1 microsensor, subsequently redesigned with flexible printed circuits to create a flexible 8-in-1 microsensor.
• Employed fabrication techniques including physical vapor deposition (PVD), lithography, lift-off, and wet etching on a 50 μm polyimide (PI) substrate with Au/Ti electrodes.

Main Results:

• Successfully developed and embedded a flexible 8-in-1 microsensor (measuring oxygen, clamping pressure, hydrogen, voltage, current, temperature, flow, and humidity) into a proton battery stack.
• Demonstrated the capability for real-time, microscopic measurement of multiple interrelated parameters.
• The polyimide substrate provided excellent mechanical, thermal, and chemical resistance for sensor operation.

Conclusions:

• The developed flexible 8-in-1 microsensor enables unprecedented simultaneous and accurate monitoring of key parameters within proton battery stacks.
• This technology offers a significant advancement for optimizing proton battery performance, extending lifespan, and ensuring safety.
• The integration of MEMS technology and flexible electronics provides a robust platform for future battery monitoring systems.