Ultrasonic scanning device and an application and method thereof

A lithium-ion battery testing method,

• wherein the method is performed by an ultrasonic scanning device with the lithium-ion battery as a test subject,
• wherein the ultrasonic scanning device comprises:
• at least one pair of ultrasonic transducers, each pair comprising a first ultrasonic transducer and a second ultrasonic transducer;
• and
• at least one pair of cylindrical rollers, each pair comprising a first cylindrical roller and a second cylindrical roller;
• wherein,
• an axis of the first cylindrical roller is parallel to an axis of the second cylindrical roller;
• a first liquid is contained in the first cylindrical roller and the second cylindrical roller, and the first liquid is configured to couple an ultrasound to the test subject;
• the first ultrasonic transducer and the second ultrasonic transducer employ a flat ultrasonic transducer or a focused ultrasonic transducer;
• each pair of ultrasonic transducers is provided in a corresponding pair of cylindrical rollers;
• the first ultrasonic transducer of each pair of the ultrasonic transducers is arranged in the first cylindrical roller of the corresponding pair of cylindrical rollers;
• the second ultrasonic transducer of each pair of ultrasonic transducers is arranged in the second cylindrical roller of the corresponding pair of cylindrical rollers;
• the at least one pair of ultrasonic transducers are configured to both emit and receive the ultrasound;
• the first ultrasonic transducer of each pair of ultrasonic transducers is arranged opposite to the second ultrasonic transducer of the same pair of ultrasonic transducers;
• a line between an ultrasonic signal receiving center point and an ultrasonic signal emitting center point of each pair of ultrasonic transducers is to be coplanar with a plane of axes of the corresponding pair of cylindrical rollers;
• and
• a size of a gap between each pair of cylindrical rollers is fixed;
• wherein, the method comprises:
• operating the first cylindrical roller of each pair of cylindrical rollers by rotating the first cylindrical roller around the axis of the first cylindrical roller clockwise, and operating the second cylindrical roller of each pair of cylindrical rollers by rotating the second cylindrical roller around the axis of the second cylindrical roller counterclockwise, passing the test subject between the at least one pair of cylindrical rollers, and testing the test subject by way of the ultrasound, wherein passing of the test subject between the at least one pair of cylindrical rollers causes an elastic deformation to occur on the at least one pair of cylindrical rollers or the test subject,
• ensuring propagation of the ultrasound with the test subject in surface-to-surface contiguous contact with the at least one pair of cylindrical rollers;
• reciprocating the at least one pair of ultrasonic transducers in an axial direction of the at least one pair of cylindrical rollers;
• passing the test subject through the gap with the test subject simultaneously contacting cylinder walls of the first cylindrical roller and the second cylindrical roller;
• rotating the first cylindrical roller, which is provided with an actuating device, at a predetermined angular velocity;
• rotating the second cylindrical roller, which is not provided with the actuating device, under an action of friction;
• forming an ultrasonic image of the test subject, and
• detecting an internal flaw and a health status of the lithium-ion battery.

A method for obtaining an ultrasonic image,

• wherein the method is performed by an ultrasonic scanning device,
• wherein the ultrasonic scanning device comprises:
• at least one pair of ultrasonic transducers, each pair comprising a first ultrasonic transducer and a second ultrasonic transducer;
• and
• at least one pair of cylindrical rollers, each pair comprising a first cylindrical roller and a second cylindrical roller;
• wherein
• an axis of each first cylindrical roller is parallel to an axis of the corresponding second cylindrical roller;
• a first liquid is contained in each first cylindrical roller and each second cylindrical roller, and the first liquid is configured to couple an ultrasound to a test subject;
• wherein the method comprises:
• operating the first cylindrical roller of each pair of cylindrical rollers by rotating the first cylindrical roller around the axis of the first cylindrical roller clockwise, and operating the second cylindrical roller of each pair of cylindrical rollers by rotating the second cylindrical roller around the axis of the second cylindrical roller counterclockwise, passing the test subject between the at least one pair of cylindrical rollers, and testing the test subject by way of the ultrasound;
• defining a normal direction of a plane of axes of the at least one pair of cylindrical rollers as x, defining an angular velocity of the at least one pair of cylindrical rollers as ω1, defining a minimum distance between the axes of the at least one pair of cylindrical rollers and the test subject during a working process as R, and defining a scanning time as t;
• wherein a displacement X of at least one pair of ultrasonic transducers relative to the test subject in an x-direction is ω1Rt;
• defining a direction parallel to the axial direction of the at least one pair of cylindrical rollers as y, wherein the at least one pair of ultrasonic transducers reciprocate in a y-direction with a frequency of p, and a relationship between a displacement Y of the at least one pair of ultrasonic transducers and t is Y=f(t);
• defining a signal strength detected by the at least one pair of ultrasonic transducers at the scanning time t as S, establishing a relationship between S, X and Y according to t, X, Y and S at the scanning time t, and adding a false color on S and preparing an image according to the relationship between S, X and Y, wherein the image is the ultrasonic image of the test subject, and the ultrasonic image reflects ultrasonic transmission characteristics at different positions of the test subject, wherein passing of the test subject between the at least one pair of cylindrical rollers causes an elastic deformation to occur on the at least one pair of cylindrical rollers or the test subject;
• and
• ensuring propagation of the ultrasound with the test subject in surface-to-surface contiguous contact with the at least one pair of cylindrical rollers.