Nondestructive defect detection method of lithium ion battery

Abstract

The invention discloses a nondestructive defect detection method of a lithium ion battery. The nondestructive defect detection method comprises the following steps that: (1) a signal transmitting end transmits ultrasonic signals to the lithium ion battery to be detected, wherein the signal intensity is I0; (2) the signal receiving end receives ultrasonic signals in the ultrasonic signals, which pass through the lithium ion battery to be detected, wherein the signal intensity I1 of the ultrasonic waves is a group of signal intensity data corresponding to various scanning points of the lithium ion battery to be detected; and (3) comparing the I1 with the I0 to generate a group of transmissivity t1 corresponding to various scanning points of the lithium ion battery to be detected, and then outputting t1. The nondestructive defect detection method is used for carrying out nondestructive detection on the internal state of the lithium ion battery by adopting the ultrasonic waves, so that the waste on the time caused by repeated charging and discharging detection is avoided; and higher detection speed and precision can be acquired by using air as a coupling medium and analyzing the transmissivity of different areas, and the position in which the defect is located can be accurately acquired, which cannot be achieved by repeated charging and discharging either.

Description

technical field [0001] The invention relates to the technical field of battery preparation, in particular to a nondestructive testing method for lithium ion batteries. Background technique [0002] Lithium-ion batteries (lithium batteries) have the advantages of high voltage, high specific energy, many cycle times, and long storage time. They are not only widely used in portable electronic devices such as mobile phones, digital cameras, and laptops, but also widely used in In terms of large and medium-sized electric equipment such as electric vehicles, electric bicycles, and electric tools, the performance requirements for lithium-ion batteries are getting higher and higher. [0003] When manufacturing lithium-ion batteries, restricted by the manufacturing process, the distribution of the electrolyte may not be uniform, causing defects such as air layers or foreign objects. The cost of the method is high and the cycle is long, so there is a need for a detection method that ...

AI Technical Summary

Problems solved by technology

[0003] When manufacturing lithium-ion batteries, restricted by the manufacturing process, the distribution of the electrolyte may not be uniform, resulting in defects such as air layers or foreign objects. The cost of the method is high and the cycle is long, so there is a need for a detection method that can implement convenient detection with a short cycle

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