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Lithium-ion battery internal non-destructive testing method and the battery health state testing method

A lithium-ion battery and non-destructive testing technology, applied in the field of energy storage, can solve the problems of impracticality and high cost of technical means, and achieve the effect of short test time, high reliability and simple operation

Active Publication Date: 2019-04-05
CHINA ELECTRIC POWER RES INST +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, with the large-scale promotion of lithium-ion batteries in electric vehicles and grid energy storage, the technical means used in these basic researches are too expensive to be practical. An online detection and monitoring technology to strengthen the monitoring and management of batteries, especially performance degradation and safety warning

Method used

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  • Lithium-ion battery internal non-destructive testing method and the battery health state testing method
  • Lithium-ion battery internal non-destructive testing method and the battery health state testing method
  • Lithium-ion battery internal non-destructive testing method and the battery health state testing method

Examples

Experimental program
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Effect test

Embodiment 1

[0033] Such as Figure 1-4 As shown, the invention of this example provides a method for non-destructive testing inside a lithium-ion battery and a method for testing the state of health of the battery; the non-destructive testing method includes:

[0034] With lithium-ion battery as the base, the ultrasonic time-domain transmitter is used to transmit ultrasonic pulse signals to the battery. When the signal encounters an interface or a new medium, a specific reflected wave will be reflected back and received by the receiver. At the same time, it will Appear on the oscilloscope with the corresponding specific waveform. Since each interface will have specific reflection signals in different time domains, the hierarchical area is divided according to the waveform signal; the hierarchical area includes electrodes, diaphragms, and SEI films, etc. How to divide the hierarchical area according to the waveform signal, according to what principle and basis? Carry out the change analys...

Embodiment 2

[0036] LiFePO 4 A CR2032 button battery with a positive electrode and graphite as a negative electrode is used as a substrate, and an ultrasonic probe with a frequency of 30MHz is used as an ultrasonic pulse transmitter. Or on the negative surface, turn on the oscilloscope and pulse reflector, adjust the parameters, such as what kind of parameters? , carry out the test, analyze the test result, and obtain the corresponding internal test result of the battery. The battery health status test includes, using batteries in different states, first using a fresh battery for non-destructive testing, and for the fresh battery after the non-destructive testing, perform an electrochemical performance test or a cycle performance test or a rate performance test. After a certain number of battery charge and discharge cycles, ultrasonic nondestructive testing is carried out, and then the battery charge and discharge cycles are tested again, and so on, and finally the corresponding data is o...

Embodiment 3

[0038] LiFePO 4 A soft-pack battery (different specifications) with graphite as the positive electrode and graphite as the negative electrode is used as the substrate, and the ultrasonic probe with a frequency of 5 MHz is used as the ultrasonic pulse transmitter. Turn on the oscilloscope and pulse reflector, and adjust the parameters, such as which type of parameters? , carry out the test, analyze the test result, and obtain the corresponding internal test result of the battery. The battery health status test includes, using batteries in different states, first using a fresh battery for non-destructive testing, and for the fresh battery after the non-destructive testing, perform an electrochemical performance test or a cycle performance test or a rate performance test. After a certain number of battery charge and discharge cycles, ultrasonic nondestructive testing is carried out, and then the battery charge and discharge cycles are tested again, and so on, and finally the cor...

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Abstract

The invention relates to a lithium ion battery internal nondestructive test method and a battery health state detection method. The test method comprises selecting a cell base, acquiring a layer grade area signal in the base, dividing the layer grade area and analyzing layer grade area change. The methods improve battery monitoring and management and realize performance attenuation and safety early warning.

Description

Technical field: [0001] The invention relates to the technical field of energy storage, and more specifically relates to a method for online non-destructive detection of the health state of a lithium-ion battery by ultrasonic time-domain reflection. Background technique: [0002] Lithium-ion batteries are currently the main power source for electronics and small appliances. In recent years, with the rapid development of electric vehicles and large-scale energy storage technology, the application scale and application occasions of lithium-ion batteries have become more expanded and diversified, and its performance and application effects have also attracted more attention, especially safety , life, input / output performance and other key indicators. Therefore, the detection and evaluation technologies and methods corresponding to these indicators are also an important technical direction for the large-scale promotion and application of lithium-ion batteries. At present, comm...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N29/14
Inventor 林跃生吴卫卫金翼王绥军傅凯刘曙光闫雪生褚永金
Owner CHINA ELECTRIC POWER RES INST
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