Thermal runaway simulation method and device based on lithium ion battery thermal runaway prediction model

Abstract

The invention relates to a thermal runaway simulation method and device based on a lithium ion battery thermal runaway prediction model. According to the method, a lithium ion battery thermal runawayprediction model is established by using lithium ion battery SOC (residual electric quantity) and lithium ion battery SOH (health degree) and based on a lithium ion battery heat generation mechanism;the instantaneous heat generation power of the corresponding lithium ion battery is calculated by using the lithium ion battery thermal runaway prediction model; the control unit electrically controlsthe heat generation element to simulate heat generation so as to collect the temperature, the resistance value of the heat generation element and the output current value of the control unit, so thatthe instantaneous heat generation power of simulated heat generation is calculated; and the calculated instantaneous heat generation power of the simulated heat generation is compared with the instantaneous heat generation power of the lithium ion battery calculated by the thermal runaway prediction model of the lithium ion battery to complete accurate simulation of the thermal runaway process ofthe lithium ion battery. The method provides an experimental platform for mechanism research such as thermal runaway diffusion and can also provide an experimental environment for devices such as thermal runaway management and control.

Description

technical field [0001] The invention relates to the field of lithium-ion battery safety, in particular to a thermal runaway simulation method and device based on a lithium-ion battery thermal runaway prediction model. Background technique [0002] Electric vehicle thermal management technology has become one of the important factors restricting the development of electric vehicle technology and improving safety. With the continuous improvement of the performance requirements of electric vehicles, factors such as high-current charging, high-capacity lithium-ion batteries, and complex working conditions will cause lithium-ion batteries to encounter thermal problems during use, and there is a possibility of thermal runaway. When the loss of control occurs, it will cause the lithium-ion battery pack to burn, endangering the safety of the vehicle. [0003] Thermal runaway refers to the phenomenon that the internal diaphragm of the lithium-ion battery melts due to factors such as...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem that the existing lithium-ion battery thermal runaway simulation devices are mostly established based on the surface temperature conditions or temperature rise rate of lithium-ion batteries, it is impossible to accurately simulate the heat generation during the thermal runaway process of lithium-ion batteries, and it is also impossible to simulate the heat generation of lithium-ion batteries. For the problem of non-uniform heat generation in the process of runaway, the present invention provides a thermal runaway simulation method based on a lithium-ion battery thermal runaway prediction model, combined with an accurate prediction model of thermal runaway, based on the heat generation and heat transfer process of lithium-ion batteries, analysis The heat generation power of the lithium-ion battery during the thermal runaway process uses electronically controlled heat generating elements to simulate thermal runaway heat generation, and then performs comparison and adjustment processing to provide an experimental platform for the study of thermal runaway diffusion and other mechanisms, as well as for thermal runaway control. and other devices provide experimental environment

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