Power battery thermal runaway early warning method

A power battery, thermal runaway technology, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve problems such as difficult to adapt to the real vehicle environment, difficult to apply to the full life cycle of the battery, and narrow battery life cycle.

Inactive Publication Date: 2020-07-07
DALIAN UNIV OF TECH
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Problems solved by technology

However, the existing battery thermal runaway early warning methods have the following problems: (1) The applicable battery working conditions are not comprehensive, and many thermal runaway early warning methods are to study the early warning methods of battery thermal runaway under specific working conditions in the laboratory, which is difficult to adapt (2) The battery life cycle covered is narrow, and many thermal runaway warning methods only work within the fixed life cycle of the battery, which is difficult to apply to the entire life cycle of the battery

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  • Power battery thermal runaway early warning method

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Embodiment Construction

[0022] The present invention will be further described below in conjunction with specific embodiments.

[0023] The flow chart of the power battery thermal runaway early warning method provided by the present invention is as follows figure 1 Shown. The five-dimensional data security model of the power battery stores the five parameters of the power battery's SOH (battery state of health), T (temperature), SOC (battery state of charge), I (current), and V (voltage) According to the data, the SOH value of the power battery stored in the model is averaged as 11 in the normal SOH interval [80%, 100%], and the corresponding SOH point is: SOH 1 =80%, SOH 2 =82%,...,SOH 10 =98%, SOH 11 =100%; the T value of the power battery stored in the model is averaged as 15 in the normal temperature range [-20℃, 50℃], and the corresponding T point is T 1 =-20℃,T 2 =-15℃,...,T 14 =45℃,T 15 =50℃; The average SOC value of the power battery stored in the model is taken as 17 in the normal SOC interval...

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Abstract

The invention belongs to the technical field of new energy automobile power batteries, and relates to a power battery thermal runaway early warning method. The method comprises the steps: establishingan initial power battery five-dimensional data security model; collecting five-dimensional data of the power battery in real time, comparing the difference degree between the real-time five-dimensional data and the five-dimensional data in the safety model, judging the number and the deviation degree of thermal runaway points of the battery, and updating the five-dimensional data safety model ofthe power battery in real time; and finally, performing comprehensive analyzing to obtain the thermal runaway grade of the power battery according to the number and the deviation degree of the thermalrunaway points. The power battery thermal runaway early warning method provided by the invention is suitable for all working conditions of the vehicle and the whole life cycle of the battery, can effectively detect the battery thermal runaway phenomenon in advance, and avoids malignant accidents.

Description

Technical field [0001] The application belongs to the technical field of power batteries for new energy vehicles, and relates to an early warning method for thermal runaway of power batteries. Background technique [0002] In order to alleviate the huge problems of energy crisis and environmental pollution, vigorously developing new energy vehicles has become an inevitable trend in the automotive industry. Lithium-ion power batteries have become the most commonly used energy source in new energy vehicles because of their high specific energy, high specific power, high charge and discharge rate, and long cycle life. [0003] However, with the increasing driving range of new energy vehicles, the energy density of lithium-ion power batteries is increasing, which reduces the safety of lithium-ion power batteries and leads to the safety of lithium-ion power batteries mainly due to thermal runaway Accidents often happen. Thermal runaway accidents of lithium-ion power batteries are mani...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/367G01R31/382G01R31/385
CPCG01R31/367G01R31/382G01R31/385
Inventor 周雅夫孙宵宵马建刚仪坤连静李琳辉
Owner DALIAN UNIV OF TECH
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