Battery thermal runaway early warning method and device

An early warning device and thermal runaway technology, which is applied in the direction of testing and transportation of electrical devices, measuring devices, measuring electricity, etc., can solve problems such as inability to distinguish between battery thermal runaway faults, sensor electrical faults, and sampling line burnout, so as to reduce errors. Probability of false positives and false negatives, improved applicability, and improved reliability

Pending Publication Date: 2021-02-23
GAC AION NEW ENERGY AUTOMOBILE CO LTD
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has the following defects: 1) It relies on the reliability of BMS for battery temperature and voltage data collection, and in some cases it is impossible to distinguish between battery thermal runaway faults and sensor electrical faults (such as sampling line disconnection fault, and the sampling line will also be blown when thermal runaway occurs); 2

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  • Battery thermal runaway early warning method and device
  • Battery thermal runaway early warning method and device
  • Battery thermal runaway early warning method and device

Examples

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Embodiment Construction

[0046] The following descriptions of various embodiments refer to the accompanying drawings to illustrate specific embodiments in which the present invention can be implemented.

[0047] Please refer to figure 1 As shown, Embodiment 1 of the present invention provides a battery thermal runaway early warning method, including:

[0048] Step S1, calculating the leakage current of each single battery according to statistical data within a preset time range;

[0049] Step S2, collecting battery thermal runaway characteristic data in real time through the battery management system BMS, and obtaining a real-time diagnosis result of whether thermal runaway occurs according to the battery thermal runaway characteristic data;

[0050] Step S3, according to the relationship between the leakage current of each single battery and the diagnosis threshold, or according to the real-time diagnosis result, determine whether thermal runaway occurs, and give an early warning when it is determin...

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Abstract

The invention discloses a battery thermal runaway early warning method and device. The battery thermal runaway early warning method comprises the steps of: S1, calculating the leakage current of eachsingle battery according to the statistical data in a preset time range; S2, collecting battery thermal runaway characteristic data in real time through a battery management system BMS, and acquiringa real-time diagnosis result indicating whether thermal runaway occurs or not according to the battery thermal runaway characteristic data; and S3, judging whether thermal runaway occurs or not according to the size relationship between the leakage current of each single battery and a diagnosis threshold or according to the real-time diagnosis result, and carrying out early warning when it is judged that thermal runaway occurs. The battery thermal runaway early warning method is close to the actual demand for the thermal runaway early warning function at present, reduces the false alarm and missing alarm probability of thermal runaway early warning, reserves as much time as possible for user escape and after-sales rescue, and greatly improves the reliability of battery thermal runaway early warning.

Description

technical field [0001] The invention belongs to the technical field of new energy vehicles, and in particular relates to a battery thermal runaway early warning method and device. Background technique [0002] The sudden combustion and explosion of the power battery is the result of the thermal runaway of the battery. Battery thermal runaway refers to the overheating phenomenon in which the exothermic chain reaction inside the battery causes a sharp change in the temperature rise rate of the battery. Thermal runaway is the result of battery safety problems, not the cause of battery safety problems. After an internal short circuit occurs in the battery, the Joule heat generated by the short circuit current in the battery will cause the temperature of the battery to rise, and the heat cannot be dissipated in time. Continued temperature rise will trigger an uncontrolled chain reaction of the battery, which will lead to thermal runaway of the battery. [0003] At present, the ...

Claims

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Application Information

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IPC IPC(8): G01R31/392G01R31/396G01R31/367G01R31/382G01R31/36G01R31/00
CPCG01R31/006G01R31/3648G01R31/367G01R31/382G01R31/392G01R31/396
Inventor 黄伟平贺辉蔡亚辉李志彭永川陈承鹤
Owner GAC AION NEW ENERGY AUTOMOBILE CO LTD
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