Ultrasonic method identifies faulty batteries before they fail operationally
In a groundbreaking development, researchers at Drexel University have developed a non-invasive ultrasound technique to monitor the electrochemical and mechanical functions of lithium-ion batteries. This innovative method, known as scanning acoustic microscopy, uses low-energy sound waves to identify potential defects within batteries, providing a faster, less expensive, and more user-friendly alternative to traditional X-ray scans [1][2][3][4].
The ultrasound technique offers several key advantages over traditional methods. It is faster, taking less time to generate results than X-ray scans, and it doesn't require damaging the battery. This non-invasive approach allows for real-time data without disrupting the battery's functionality [1].
The method is particularly good at detecting the presence of gas inside a battery, a critical defect that signals dry regions where cells may short-circuit during use, leading to potential failures. It can also identify internal cracks, dry areas, and misaligned components, all of which can affect the battery's performance and safety [1].
By identifying these flaws early, the technique helps prevent thermal runaway, a dangerous condition where the battery overheats uncontrollably. This is crucial in preventing fires and ensuring consumer safety, especially in the rapidly growing market for batteries powering a wide range of devices, from smartphones to electric vehicles [1].
The Drexel team's ultrasound tool is low-cost and accessible, making it suitable for integration into production lines. Chang, the lead researcher, aims to lower the barrier to entry for ultrasonic testing, making it a routine part of battery research and development [1].
The team has developed open-source software to run the ultrasound instrument and produce a rapid analysis of the resulting data. They also hope to improve the technology to more easily scan battery electrodes, cells, and produce more detailed three-dimensional images [1].
Current safety and quality control processes for manufactured batteries rely heavily on visual inspection and performance testing of select battery cells after they come off the line. The ultrasound technique could potentially become a regular tool for spotting bad batteries before they malfunction [1].
The method proposed by the Drexel team uses acoustic imaging-ultrasound, which is faster and less expensive than X-rays and can provide complementary information about the mechanical properties of the battery [1]. As the rush to supply batteries for these devices has created a market for products that can be produced cheaper and faster, this innovation is particularly timely [1].
The ultrasound testing method provides instantaneous access to data during the design and testing process, allowing for quick adjustments and corrections. However, there is a need to teach battery engineers how it works and why it is useful [1].
In collaboration with research partners at SES AI, a lithium metal battery startup company, the Drexel team has already deployed the ultrasound testing platform at their research and development site [1]. As individuals use three to four electronic devices powered by batteries each day, a number that has doubled in the last five years, this innovation is poised to significantly enhance the safety and quality control of lithium-ion batteries in various applications.
References: [1] Drexel University. (2021). Drexel researchers develop low-cost, non-invasive ultrasound technique to monitor lithium-ion batteries for defects. ScienceDaily. [2] Drexel University. (2021). Ultrasound imaging can help battery engineers spot bad batteries before they malfunction. Phys.org. [3] Drexel University. (2021). Ultrasound technique reveals damage and flaws in batteries that could lead to overheating and thermal runaway. EurekAlert!. [4] Drexel University. (2021). Drexel researchers develop open-source software for noninvasive ultrasound battery testing. PR Newswire.
The ultrasound technique could be revolutionizing not only the field of science but also technology, as it offers a faster, less expensive, and user-friendly alternative for monitoring the quality of lithium-ion batteries. This non-invasive approach can detect critical defects such as gas presence, internal cracks, and dry areas, hence preventing potential failures and ensuring the safety of various devices, ranging from smartphones to electric vehicles.
