Reaction temperature sensing (RTS)-based control for Li-ion battery safety

Area of Science:

• Materials Science
• Electrochemistry
• Battery Technology

Background:

• Lithium-ion batteries are critical for modern electronics and electric vehicles.
• Ensuring the safety of lithium-ion batteries, particularly preventing thermal runaway, remains a significant challenge.
• Current safety mechanisms often rely on external temperature monitoring, which has limitations in early detection.

Purpose of the Study:

• To introduce and evaluate reaction temperature sensing (RTS) as a novel method for enhancing lithium-ion battery safety.
• To compare the efficacy of RTS-based control with traditional surface temperature-based control in mitigating hazardous events.
• To demonstrate the ability of RTS to provide faster and more accurate temperature detection within the battery cell.

Main Methods:

• Implementing RTS directly at the electrochemical interface within a lithium-ion battery cell.
• Conducting controlled short-circuit experiments to trigger thermal events.
• Comparing the response time and effectiveness of RTS-based shutdown with surface temperature-based control systems.
• Quantifying the temperature reduction and damage prevention achieved by RTS.

Main Results:

• RTS detected internal temperature increases significantly faster and more accurately than external cell surface measurements.
• RTS-based control initiated shutdown of a short-circuit event three times earlier compared to surface temperature-based control.
• The RTS system successfully prevented cell overheating by 50°C, thereby avoiding cell damage.

Conclusions:

• Reaction temperature sensing offers a fundamentally improved approach to lithium-ion battery safety.
• Internal sensing via RTS provides superior early detection and mitigation of thermal runaway events.
• RTS-based control is a promising technology for preventing battery damage and enhancing overall safety in lithium-ion cells.