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Lithium ion battery thermal runaway early warning system and early warning method

A thermal runaway, master control unit technology, applied in secondary batteries, secondary battery repair/maintenance, circuits, etc., can solve problems such as difficulty in obtaining temperature characteristics, and the timeliness of early warning mechanisms cannot be guaranteed, and achieve dynamic Tracking and responding, improving timeliness, and good timeliness

Active Publication Date: 2019-05-21
BEIHANG UNIV
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Problems solved by technology

However, when the battery has a risk of thermal runaway in the early stage, internal characteristics such as temperature characteristics are difficult to obtain, so the timeliness of the early warning mechanism cannot be guaranteed at present.

Method used

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  • Lithium ion battery thermal runaway early warning system and early warning method
  • Lithium ion battery thermal runaway early warning system and early warning method

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Embodiment Construction

[0030] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0031] The lithium-ion battery thermal runaway early warning system of the present invention includes a battery management system 1, a sensor part 2, an alarm device 3 and an automatic emergency fire extinguishing device 4, such as figure 1 shown. Wherein, the battery management system 1 includes a detection unit 101 and a main control unit 102 . The sensor part 2 includes an ultrasonic sensor 201 , a temperature sensor 202 , a voltage sensor 203 and a smoke sensor 204 . The ultrasonic sensor 201 is used to detect the gas release inside the lithium battery; the temperature sensor 202 is used to detect the temperature of the battery surface; the voltage sensor 203 is used to detect the voltage of the battery; the smoke sensor 204 is used to detect the concentration of smoke particles in the battery box.

[0032] The input end of the detection unit 101 is con...

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Abstract

The invention designs a lithium ion battery thermal runaway early warning system and an early warning method. The early warning system comprises various sensors, a battery management system, a warningdevice and an automatic emergency fire extinguishing device. The sensors comprise an ultrasonic sensor, a temperature sensor, a voltage sensor and a smoke sensor. The ultrasonic sensor can reflect abattery internal gas state characteristic, so prejudgment and diagnosis are carried out on battery thermal safety in a thermal runaway risk emerging early phase timely and early warning is rapid and efficient. The battery management system carries out data analysis based on various sensor combined detection, compares a plurality of parameters with set thresholds, sends out different levels of early warning signals and takes different control policies. A safety accident risk resulting from thermal runaway is reduced, and personnel injury is reduced.

Description

technical field [0001] The invention belongs to the field of power batteries for new energy vehicles, and in particular relates to a thermal runaway early warning system and method for new energy vehicles. Background technique [0002] Lithium-ion batteries are currently widely used as power sources in electric vehicles. In order to meet the requirements of driving range, the energy density of lithium-ion batteries continues to increase, which brings significant thermal safety issues. There have been many electric vehicle fires in recent years, most of which are related to the thermal safety of lithium-ion batteries. The main thermal safety issue of Li-ion batteries comes from thermal runaway. Thermal runaway refers to an overheating phenomenon in which the battery temperature rises sharply due to a series of exothermic chain reactions inside the battery, and the temperature is no longer controllable, which can lead to dangerous situations such as fire, explosion, and combu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/42H01M10/48
CPCY02E60/10
Inventor 杨世春华旸张祚铭潘宇巍闫啸宇
Owner BEIHANG UNIV
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