Lithium ion battery thermal runaway early warning method based on ultrasonic guided wave sensor

A lithium-ion battery and ultrasonic guided wave technology, applied in secondary batteries, instruments, circuits, etc., can solve problems such as inability to diagnose thermal runaway in time, achieve good timeliness and reliability, light weight, and easy integration

Active Publication Date: 2021-10-22
BEIJING INSTITUTE OF TECHNOLOGYGY
View PDF7 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the application of temperature sensors cannot diagnose the occurrence of thermal runaway in time

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
  • Lithium ion battery thermal runaway early warning method based on ultrasonic guided wave sensor
  • Lithium ion battery thermal runaway early warning method based on ultrasonic guided wave sensor
  • Lithium ion battery thermal runaway early warning method based on ultrasonic guided wave sensor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0040] The technical solution of the present invention will be described in further detail below in conjunction with the accompanying drawings, but the protection scope of the present invention is not limited to the following description.

[0041] like figure 1 As shown, a lithium-ion battery thermal runaway warning method based on an ultrasonic guided wave sensor includes the following steps:

[0042] S1. Select several lithium-ion batteries, fix the ultrasonic guided wave sensor on the surface of the same side of the lithium-ion batteries, and connect the microcontroller chip;

[0043] like Figure 2a and Figure 2b As shown, an ultrasonic guided wave sensor includes: a pair of ultrasonic pulse transmitting pieces 2, ultrasonic pulse receiving pieces 3;

[0044] Fix the ultrasonic pulse transmitting sheet 2 and the ultrasonic pulse receiving sheet 3 on the two ends of the same surface of the lithium ion battery 1 respectively, and perform curing treatment; epoxy resin can...

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

PropertyMeasurementUnit
diameteraaaaaaaaaa
thicknessaaaaaaaaaa
Login to view more

Abstract

The invention discloses a lithium ion battery thermal runaway early warning method based on an ultrasonic guided wave sensor, which comprises the following steps: fixing the ultrasonic guided wave sensor on the surface of the same side of a lithium ion battery, and connecting the sensor with a microcontroller chip; performing a plurality of complete charging and discharging cycles, during the period, enabling the ultrasonic guided wave sensor to excite and receive ultrasonic signals penetrating through the lithium ion battery in a timed mode, and collecting the ultrasonic guided wave signals on line through the microcontroller chip; calculating the difference quotient of the TOF and the SA measured in two adjacent times, and selecting the difference quotient with the maximum absolute value as the threshold value of the thermal runaway early warning of the lithium ion battery; and in the actual working process of the lithium ion battery, enabling the ultrasonic guided wave sensor to excite and receive an ultrasonic signal penetrating through the lithium ion battery in a timed mode, enabling the microcontroller chip to calculate the difference quotient of TOF and SA measured in two adjacent times, and if the difference quotient repeatedly exceeds a threshold value, sending out a thermal runaway early warning signal. According to the method, the basis for judging thermal runaway is sufficient, and good timeliness and reliability are achieved.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to an early warning method for thermal runaway of a lithium-ion battery based on an ultrasonic guided wave sensor. Background technique [0002] Lithium-ion batteries are widely used in electric vehicle power systems due to their many advantages such as high energy density, high power density, long life and no memory effect. However, battery safety accidents represented by thermal runaway occur from time to time, causing casualties and property losses, and affecting the vigorous development of the entire electric vehicle market. [0003] In the actual use of lithium-ion batteries, the occurrence of thermal runaway is very rapid and unpredictable. Abuse is the main source of battery thermal runaway, which can be divided into mechanical abuse (extrusion, drop, immersion, etc.), electrical abuse (forced overcharge, overdischarge, short circuit, etc.) and thermal abuse (fire, thermal...

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
Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/392G01R31/385H01M10/48
CPCG01R31/392G01R31/385H01M10/48H01M10/486Y02E60/10
Inventor 魏中宝刘春霞何洪文李建威曹万科
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap