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System and method for detecting health state acoustic emission of lithium ion battery

A lithium-ion battery and acoustic emission detection technology, which is applied in the direction of material analysis, measurement of electricity, and measurement devices using acoustic emission technology, which can solve the problem of high cost and achieve the effect of improving safety.

Pending Publication Date: 2019-11-12
SHENZHEN POLYTECHNIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the cost of these detection methods is relatively high, and active excitation will have a certain impact on the battery itself

Method used

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  • System and method for detecting health state acoustic emission of lithium ion battery
  • System and method for detecting health state acoustic emission of lithium ion battery
  • System and method for detecting health state acoustic emission of lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] A kind of lithium-ion battery state of health acoustic emission detection system, see figure 1 ,include:

[0051] Charging and discharging equipment 1: electrically connected to the lithium-ion battery 5 to charge or discharge the lithium-ion battery 5;

[0052] Acoustic emission sensor 3: used to receive the acoustic emission signal inside the lithium-ion battery 5 and convert it into an electrical signal;

[0053] Processing terminal 6 : electrically connected to the acoustic emission sensor 3 ; the processing terminal 6 is used to receive the electrical signal output by the acoustic emission sensor 3 .

[0054]Specifically, due to the different internal material properties or structural properties of healthy, aged or damaged batteries, batteries in different health states will change due to their internal material properties or structural properties, which will cause rapid release of strain energy and produce The stress wave, thus forming the acoustic emission sign...

Embodiment 2

[0066] An acoustic emission detection method for a lithium-ion battery state of health, which is run on the processing terminal in the system of Embodiment 1, see figure 2 , including the following steps:

[0067] S1: Collect the digital signal output by the acoustic emission preamplifier when the lithium-ion battery sample is not charged or discharged, and record it as environmental noise;

[0068] Specifically, the environmental noise is the acoustic emission signal collected when the lithium-ion battery is not in use, and also includes the noise of the surrounding environment.

[0069] S2: Set the filter threshold according to the environmental noise, and control the charging and discharging equipment to charge or discharge the lithium ion battery sample; specifically, control the charging and discharging equipment to perform constant current charging or constant voltage charging on the lithium ion battery sample.

[0070] Specifically, the filtering threshold is set acco...

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Abstract

The invention provides a system for detecting the health state acoustic emission of a lithium ion battery. The charging and discharging equipment is electrically connected with the lithium ion batteryand is used for charging or discharging the lithium ion battery; an acoustic emission sensor is used for receiving an acoustic emission signal inside the lithium ion battery and converting the acoustic emission signal into an electric signal; a processing terminal is electrically connected with the acoustic emission sensor; and the processing terminal is used for receiving the electric signal output by the acoustic emission sensor. The system belongs to non-embedded detection, does not change the internal structure of the lithium ion battery, and improves the safety of the detection of the lithium ion battery.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to an acoustic emission detection system and method for the health status of lithium ion batteries. Background technique [0002] With the development of society, energy issues have gradually attracted the attention of various countries. The limitation of fossil energy has made various countries start to look for healthier and more environmentally friendly renewable energy. As a clean and efficient new energy battery, lithium-ion batteries have obvious advantages compared with other secondary batteries, and are used and promoted by various electronic industries. Under the premise of such a large number of uses, the safety and health of lithium-ion batteries have received more attention. [0003] There are many existing lithium-ion battery detection technologies, which mainly include three parts: 1. Electrical parameter detection: the most common EIS impeda...

Claims

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Application Information

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IPC IPC(8): G01R31/392G01N29/14
CPCG01R31/392G01N29/14
Inventor 张凯何赟泽董铸荣朱亮红于湛
Owner SHENZHEN POLYTECHNIC
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