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A thermal runaway warning method for lithium-ion batteries based on ultrasonic guided wave sensors

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, and achieve good timeliness and reliability, small size, and wide detection range.

Active Publication Date: 2022-04-08
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

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

Method used

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  • A thermal runaway warning method for lithium-ion batteries based on ultrasonic guided wave sensors
  • A thermal runaway warning method for lithium-ion batteries based on ultrasonic guided wave sensors
  • A thermal runaway warning method for lithium-ion batteries based on ultrasonic guided wave sensors

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Embodiment Construction

[0040] The technical solutions of the present invention are described in further detail below with reference to the accompanying drawings, but the protection scope of the present invention is not limited to the following.

[0041] like figure 1 As shown, a method for early warning of thermal runaway of lithium-ion battery based on 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 battery, 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 sheets 2 and ultrasonic pulse receiving sheets 3;

[0044] The ultrasonic pulse emitting sheet 2 and the ultrasonic pulse receiving sheet 3 are respectively fixed on both ends of the same surface of the lithium ion battery 1 and cured; epoxy resin can be used for fixing, and...

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Abstract

The invention discloses a lithium-ion battery thermal runaway warning method based on an ultrasonic guided wave sensor. The ultrasonic guided wave sensor is fixed on the surface of the same side of the lithium-ion battery, and the sensor is connected to a microcontroller chip; several complete charging and discharging are performed. During the cycle, the ultrasonic guided wave sensor is regularly excited and receives the ultrasonic signal passing through the lithium-ion battery, and the ultrasonic guided wave signal is collected online through the microcontroller chip; the difference quotient between the TOF and SA of two adjacent measurements is calculated, and the absolute value is selected to be the largest The difference quotient is used as the threshold value of the thermal runaway warning of the lithium-ion battery; in the actual working process of the lithium-ion battery, the ultrasonic guided wave sensor is regularly excited and receives the ultrasonic signal passing through the lithium-ion battery, and the microcontroller chip calculates the The TOF and SA difference quotient of the second measurement, if the value repeatedly exceeds the threshold, a thermal runaway warning signal will be issued. The invention has sufficient basis for judging thermal runaway, and has good timeliness and reliability.

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 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, affecting the vigorous development of the entire electric vehicle market. [0003] During the actual use of Li-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 (squeeze, drop, immersion, etc.), electrical abuse (forced overcharge, overdischarge and short circuit, etc.) and thermal abuse (fire, thermal shock and overheating, et...

Claims

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Application Information

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Patent Type & Authority Patents(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
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