Magnetic Field‐Based Non‐Destructive Testing Techniques for Battery Diagnostics

With the widespread application of batteries in modern society, ensuring their safety and performance has become crucial. Traditional diagnostic methods, while providing valuable insights into battery performance, often require destructive sampling, making it difficult to achieve non‐destructive and real‐time monitoring. As a result, magnetic field‐based non‐destructive testing techniques, such as nuclear magnetic resonance (NMR), magnetic resonance imaging (MRI), and magnetic field imaging (MFI), have emerged as powerful tools for battery diagnostics. These techniques have garnered significant attention due to their non‐invasive nature and real‐time detection capabilities, allowing for the identification of defects and malfunctions under normal operating conditions without disassembling the battery or interrupting its use. This paper reviews recent advancements in the application of magnetic field‐based non‐destructive testing technologies for battery diagnostics, analyzing both their strengths and limitations. Through a comprehensive assessment of current research findings, this work provides researchers and engineers with a systematic reference to promote the application and development of magnetic field technologies in the battery field. Additionally, this review discusses the challenges and limitations encountered by magnetic field technologies in battery diagnostics and provides recommendations for their future development. The objective is to offer insights and foster continued innovation and advancement in this field.