Lithium ion battery thermal runaway modeling method

Abstract

The invention discloses a lithium ion battery thermal runaway modeling method which comprises the following steps: firstly, selecting a battery to be researched, measuring measurable thermophysical parameters of the battery, and acquiring other thermophysical parameters and chemical kinetic parameters; secondly, establishing a thermal runaway model of the lithium ion battery; thirdly, performing model verification and parameter correction through experiments; and finally, researching the thermal runaway mechanism of the battery, thermal runaway heat production, battery temperature distribution characteristics and the influence of a convective heat transfer coefficient on the thermal runaway of the battery through the corrected model. By modeling battery side reaction in the battery thermal runaway process, the battery thermal runaway process triggered by local heating is simulated, and the influence of a battery thermal runaway mechanism, thermal runaway heat production and a convective heat transfer coefficient on battery thermal runaway is analyzed.

Description

technical field [0001] The invention belongs to the field of batteries and relates to a modeling method for thermal runaway of lithium ion batteries. Background technique [0002] At present, lithium-ion batteries are widely used in important fields such as portable electronic devices, electric vehicles, and energy storage power stations. However, frequent accidents limit the application scenarios of lithium-ion batteries. [0003] At present, most studies use accelerating calorimeters to study the thermal runaway characteristics of lithium-ion batteries under adiabatic conditions, and there are few studies on other scenarios that trigger thermal runaway. Lithium batteries are subject to local heating in many application scenarios. For example, the utilization rate of internal active materials is inconsistent, resulting in local heating; the batteries in the battery module are locally heated due to different external heat dissipation conditions; the batteries are locally hea...

AI Technical Summary

Problems solved by technology

[0002] At present, lithium-ion batteries are widely used in important fields such as portable electronic devices, electric vehicles, and energy storage power stations. However, frequent accidents limit the application scenarios of lithium-ion batteries.

[0003] At present, most studies use accelerating calorimeters to study the thermal runaway characteristics of lithium-ion batteries under adiabatic conditions, and there are few studies on other scenarios that trigger thermal runaway.

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