A thermal runaway warning method for a power battery

A power battery, thermal runaway technology, applied in the direction of measuring electricity, measuring electrical variables, instruments, etc., can solve problems such as difficulty in adapting to the real vehicle environment, incomplete battery operating conditions, and difficulty in applying the full life cycle of the battery to avoid The effect of a bad accident

Inactive Publication Date: 2021-01-19
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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  • A thermal runaway warning method for a power battery

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Embodiment Construction

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

[0023] The flow chart of the power battery thermal runaway early warning method provided by the present invention is as follows figure 1 shown. In the five-dimensional data security model of the power battery, five parameters of SOH (battery state of health), T (temperature), SOC (battery state of charge), I (current) and V (voltage) of the power battery are stored. Data, the SOH value of the power battery stored in the model is averaged to take 11 within the range of 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 at 15 within the normal temperature range [-20°C, 50°C], and the corresponding T point is T 1 =-20℃, T 2 =-15℃,...,T 14 =45℃, T 15 = 50°C; take an average of 17 power battery SOC values ​​stored in the model within...

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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 of new energy vehicles, and relates to a method for early warning of 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 of the automobile industry. Due to the advantages of high specific energy, high specific power, high charge and discharge rate, and long cycle life, lithium-ion power batteries have become the most commonly used energy source in new energy vehicles. [0003] However, with the increasing mileage 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 caused by thermal runaway. Accidents happen all the time. Thermal runaway accidents of lithium-ion po...

Claims

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Application Information

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Patent Type & Authority Patents(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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