This chapter investigates the advanced application of non-destructive technique like ultrasonic techniques for detecting defects in lithium-ion batteries, with a focus on state of health (SOH) estimation, state of charge (SOC) estimation, and battery temperature detection. Through a comprehensive analysis, we demonstrate that ultrasonic methods offer noninvasive, precise, and reliable monitoring solutions that are essential for ensuring the integrity and performance of lithium-ion batteries. Ultrasonic SOH estimation enables early detection of internal structural changes and degradation, ensuring timely preventive maintenance and enhancing battery safety and long-lasting nature. For SOC estimation, ultrasonic techniques provide accurate real-time measurements by analyzing changes in acoustic properties, improving charge management, and extending battery life. Additionally, ultrasonic temperature detection offers detailed assessments of internal temperature variations, preventing overheating and optimizing thermal management systems. The integration of these ultrasonic methods significantly advances battery management systems, supporting the increasing demand for dependable energy storage solutions that spans over different applications viz electric vehicles, portable electronics, and large-scale energy storage systems.