Nondestructive defect detection method of lithium ion battery

A lithium-ion battery, non-destructive testing technology, applied in the direction of using sound wave/ultrasonic wave/infrasonic wave to analyze fluids, etc., can solve the problems of high cost, air layer or foreign matter, long cycle, etc., achieve high detection speed and accuracy, and avoid time delays wasteful effect

Active Publication Date: 2013-02-13
LISHEN (QINGDAO) NEW ENERGY CO LTD +1
View PDF5 Cites 18 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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 l

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Nondestructive defect detection method of lithium ion battery
  • Nondestructive defect detection method of lithium ion battery
  • Nondestructive defect detection method of lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0019] The present invention will be further described in detail below in conjunction with the drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.

[0020] theoretical analysis

[0021] Such as figure 1 Shown is a schematic diagram of the ultrasonic incident principle. Set the acoustic impedance of the air and the measured object as Z 1 With Z 2 ; T 12 Is the ultrasonic transmittance from the air to the measured object, T 21 Is the ultrasonic transmittance of the measured object to the air; T 121 Indicates the ultrasonic transmittance from the air to the measured object and then to the air, T 12121 Indicates the ultrasonic transmittance from air to the measured object, then to the air, then to the measured object, and finally to the air, R 12 Is the reflectivity between the air and the measured object, R 21 Is the reflectivity of the measured...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

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 ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): G01N29/02
Inventor 刁志中高飞李杨张娜
Owner LISHEN (QINGDAO) NEW ENERGY CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products