Thermal runaway early warning method based on lithium battery safety valve opening soundacoustic signal detection

A safety valve opening and acoustic signal technology, which is applied in the field of thermal runaway warning based on lithium battery safety valve opening acoustic signal detection, can solve the problem of not being able to provide effective warning of thermal runaway in the battery compartment, and achieve easy implementation, low price, and convenient installation Effect

Active Publication Date: 2019-08-30
ZHENGZHOU UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is: the present invention provides a thermal runaway early warning method based on the detection of the sound signal of the lithium battery safety valve opening, which solves the technical problem that the existing detection technology cannot provide effective early warning for the thermal runaway of the battery compartment

Method used

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  • Thermal runaway early warning method based on lithium battery safety valve opening soundacoustic signal detection
  • Thermal runaway early warning method based on lithium battery safety valve opening soundacoustic signal detection
  • Thermal runaway early warning method based on lithium battery safety valve opening soundacoustic signal detection

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Embodiment 1

[0083] This embodiment is used to illustrate the method for constructing a recognition classifier.

[0084] Step 11: Build a test platform for simulating thermal runaway, and collect the safety valve opening sound signal and noise signal in the test platform. Acoustic signal acquisition of lithium-ion battery safety valve opening is the main purpose of this test platform. In the laboratory simulation test, the lithium-ion battery is overcharged in a one-to-one designed battery compartment to cause thermal runaway of the lithium-ion battery. , the safety valve is opened to send out a sound signal, and the sound signal is collected on the top of the battery compartment by a microphone with a high sampling rate. When collecting on-site environmental noise inside the existing operating battery compartment, the high-sampling-rate microphone sample is also placed on the top. The on-site environmental noise includes cooling air-conditioning noise inside the battery compartment, BMS o...

Embodiment 2

[0110] The examples are for explaining the denoising process.

[0111] Step 2: Denoise the actually collected acoustic signal in the battery compartment;

[0112] Based on the built lithium-ion battery thermal runaway simulation test platform and acoustic signal acquisition system, the typical safety valve opening acoustic signal can be successfully collected. However, in the actual work on site, the environmental noise with complex components will be collected by the acoustic signal acquisition system together. In addition, due to factors such as sensor quality, the signal detected from the measured object may also be mixed with other white noise interference. Therefore, before identifying the safety valve opening sound signal, it is necessary to denoise the discharge sound signal, such as Figure 7 shown.

[0113] Step 21: Using wavelet transform to change the acoustic signal from a time-domain signal to a frequency-domain signal;

[0114] Wavelet analysis is an outstand...

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Abstract

The invention discloses a thermal runaway early warning method based on lithium battery safety valve opening sound signal detection, and belongs to the technical field of energy storage battery safety. The method includes constructing identification classifier for identifying safety valve opening sound signal; cCollecting an acoustic signal in the battery compartment, and carrying out denoising processing on the acoustic signal; inputting the de-noised sound signal into the identification classifier; the lithium battery safety valve opening sound signal serves as a thermal runaway early warning signal, thermal runaway early warning is sent earlier compared with an existing smoke detector and an infrared detector, sufficient time is reserved for follow-up fire fighting measures, and then spreading of thermal runaway is effectively avoided.

Description

technical field [0001] The invention relates to the technical field of energy storage battery safety, in particular to a thermal runaway early warning method based on detection of an acoustic signal of a lithium battery safety valve opening. Background technique [0002] With the development of grid technology, large-scale energy storage power stations have been developed in recent years. Lithium-ion batteries have good energy density and charge-discharge times, and are high-quality carriers for the development of large-scale energy storage power stations. However, since the first commercial application of lithium-ion batteries in 1991, the characteristics of prone to thermal runaway and the abuse of the charging and discharging process have brought certain dangers to the application, and have also hindered the application of lithium-ion batteries in large-scale energy storage power stations. For example, in July 2018, a fire accident occurred in the energy storage equipmen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/00
CPCG06F2218/06G06F2218/08G06F2218/12Y02E60/10
Inventor 金阳苏同伦姜欣高金峰吕娜伟
Owner ZHENGZHOU UNIV
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