Battery thermal runaway detection methods and devices

Abstract

The invention relates to battery thermal runaway detection methods and devices. The method comprises the steps of obtaining voltage detection data of a plurality of voltage detection points in a battery, and a plurality of pieces of temperature detection data of a plurality of temperature detection points in the battery; computing a temperature rising rate of the battery according to the pluralityof pieces of temperature detection data; and judging whether thermal runaway occurs in the battery or not according to the plurality of pieces of voltage detection data, the plurality of pieces of temperature detection data and the temperature rising rate. Through utilization of the technical scheme, the plurality of pieces of voltage detection data and the plurality of pieces of temperature detection data can be obtained according to the plurality of voltage detection points and temperature detection points set in the battery, the temperature rising rate of the battery is computed accordingto the temperature detection data, and whether the thermal runaway occurs in the battery or not is predicted through judgment of three aspects of the voltage detection data, the temperature detectiondata and the temperature rising rate. Through utilization of a multi-condition coupled method, battery thermal runaway and diffusion can be detected relatively timely and precisely under a plurality of working conditions.

Description

technical field [0001] The present disclosure relates to the field of battery safety, and in particular, to a method and device for detecting battery thermal runaway. Background technique [0002] With the increasing energy crisis and environmental pollution problems, energy-saving and environmentally friendly new energy vehicles have been rapidly developed. The power source of new energy vehicles is a large number of power batteries grouped together. The battery pack has a compact structure. During the high-rate charge and discharge process of the battery, the heat generated is large, and the heat is easy to accumulate and difficult to dissipate. Decrease and capacity attenuation can easily lead to battery thermal runaway accidents. As the energy storage unit of new energy vehicles, batteries are extremely powerful if their energy is released through combustion or explosion, which can easily cause casualties. At present, the method of improving the safety of new energy ve...

AI Technical Summary

Problems solved by technology

The power source of new energy vehicles is a large number of power batteries grouped together. The battery pack has a compact structure. During the high-rate charge and discharge process of the battery, the heat generated is large, and the heat is easy to accumulate and difficult to dissipate. Decrease, capacity attenuation, easy to cause battery thermal runaway accidents

As the energy storage unit of new energy vehicles, the battery is extremely powerful if its energy is released through combustion or explosion, which can easily cause casualties

At present, the method to improve the safety of new energy vehicles is to strengthen the protection of the battery pack, and there is no substantial technology to avoid the occurrence of thermal runaway of the battery.

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