Lithium plating is one of the most critical safety issues in lithium-ion batteries, as it not only leads to a sharp decline in battery capacity but also significantly increases the risk of thermal runaway. Most existing detection methods are designed for post-event analysis and cannot provide rapid real-time detection. This paper introduces a novel pre-detection method for lithium plating based on the time-of-flight (ToF) offset of ultrasound. By studying the intrinsic relationship between ultrasound ToF and lithium plating, the paper validates the accuracy of this detection method using ultrasonic scanning technology with ToF offset. When lithium plating reaches 1% of the graphite anode's capacity, dynamic impedance changes of the battery during low-temperature charging are measured in real-time using a self-designed dynamic impedance measurement system. Experimental results indicate that lithium plating accelerates the decay of dynamic impedance. Future work will explore non-destructive detection of lithium plating in lithium-ion batteries using electro-acoustic impedance and multi-source information.