Lithium ion battery thermal runaway early warning method

A lithium-ion battery, early warning technology, used in secondary batteries, secondary battery testing, secondary battery repair/maintenance, etc., can solve problems such as fire hazards in energy storage systems, achieve high accuracy, avoid hysteresis, The effect of preventing thermal runaway

Inactive Publication Date: 2019-12-03
CHINA ELECTRIC POWER RES INST +3
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  • Application Information

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Problems solved by technology

[0005] In view of this, the present invention proposes a method for early warning of thermal runaway of lithium-ion batteries, aiming to solve the problem of how to effectively carry out early warning of thermal runaway of lithium-ion batteries to prevent fire hazards to energy storage systems after thermal runaway of batteries

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  • Lithium ion battery thermal runaway early warning method

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Embodiment Construction

[0052] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided for more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art. It should be noted that, in the case of no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0053] refer to figure 1 As shown, this embodiment provides a method for early warning of thermal runaway of lithium-ion batteries, including the following s...

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Abstract

The invention provides a lithium ion battery thermal runaway early warning method. The lithium ion battery thermal runaway early warning method comprises the following steps of: the step 1: performinganalog simulation on a lithium ion battery, obtaining shell surface temperature data and deformation data of the lithium ion battery at the normal charging and discharging moment and the overchargingthermal runaway moment of the lithium ion battery, and establishing a battery temperature distribution model; the step 2, in the battery temperature distribution model, determining the positions of asurface temperature highest point P1 and a surface temperature lowest point P2 when the lithium ion battery is normally used; the step 3, monitoring the temperature difference [delta]T and the deformation difference [delta]d between P1 and P2 of the lithium ion battery in the use process in real time by a monitoring device; and the step 4, determining the running state of the lithium ion batteryaccording to a preset condition. Through the combined use of the maximum temperature difference of the battery body and the shell deformation, the early monitoring of the battery thermal runaway can be effectively performed. Through condition logic determination, the possibility of thermal runaway of the battery is determined, and the accuracy is high.

Description

technical field [0001] The invention relates to the technical field of lithium battery safety monitoring, in particular to an early warning method for thermal runaway of a lithium ion battery. Background technique [0002] Lithium-ion batteries have the advantages of high working voltage, high energy density, and long cycle life. They are used more and more as energy storage carriers. They are not only widely used in various electronic consumer goods, but also widely used in electric vehicles, electric vehicles, etc. Chemical energy storage and other fields. [0003] However, lithium-ion batteries not only have safety problems due to factors such as abuse (such as overcharging, overheating), manufacturing defects (such as internal short circuit, package damage), but also uneven temperature distribution of the battery itself due to heat dissipation problems during normal use. , The local temperature is too high, etc., causing a short circuit in the battery, and then thermal ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/42H01M10/48G06F17/50
CPCH01M10/425H01M10/4285H01M10/486Y02E60/10
Inventor 杨凯王康康高飞刘伟张明杰郑浩惠娜刘皓范茂松宋玉梅王凯丰耿萌萌
Owner CHINA ELECTRIC POWER RES INST
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