Method and system for modeling and simulation of liquid-immersed battery thermal runaway

By constructing a three-stage cell heat generation model and a battery-working fluid coupled multiphase heat transfer model, the internal chemical reaction of the battery and the heat transfer process of the cooling working fluid are dynamically coupled, solving the problem of low simulation accuracy of thermal runaway under immersion liquid cooling environment, and realizing accurate thermal safety design.

CN122197736BActive Publication Date: 2026-07-24SHANDONG UNIV
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Patent Information

Application Number
CN202610659954.6
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2026-05-14
Publication Date
2026-07-24
Estimated Expiration
2046-05-14

AI Technical Summary

Technical Problem

Existing technologies cannot accurately describe the working fluid backflow effect and multiphase heat transfer process during battery thermal runaway under immersion liquid cooling environment, resulting in low simulation accuracy and inability to effectively guide thermal safety design.

Method used

A three-stage cell heat generation model and a battery-working fluid coupled multiphase heat transfer model were constructed. Combined with the fluid-solid conjugate heat transfer method, the three-dimensional and transient heat transfer process between the internal chemical reaction of the battery and the cooling working fluid was dynamically coupled to simulate the entire thermal runaway process.

Benefits of technology

The study quantified the blocking effect of working fluid backflow on the internal reaction of the battery cell, accurately simulated the complex heat transfer process under immersion environment, improved the accuracy of thermal runaway simulation, and guided thermal safety design.

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Abstract

The application discloses a method and system for modeling and simulating thermal runaway of an immersed liquid-cooled battery, and belongs to the technical field of battery thermal management. The method comprises the following steps: constructing a three-section battery cell heat generation model considering the backflow effect of the working medium; the three-section battery cell heat generation model divides the whole process of the battery thermal runaway into three stages, namely, the internal chain side reaction dominant heating period, the valve opening injection and backflow interference period, and the residual decay period after backflow, and the heat generation rate of each stage is calculated respectively; a battery-working medium coupled multiphase flow heat transfer model in an immersed environment is constructed to simulate the three-dimensional, transient and multiphase flow heat transfer process between the thermal runaway battery and the surrounding cooling medium; and the three-section battery cell heat generation model and the battery-working medium coupled multiphase flow heat transfer model are dynamically coupled through the fluid-solid conjugate heat transfer method to perform the thermal runaway simulation. The application can accurately describe the unique physical process of the thermal runaway in the immersed environment, and significantly improves the simulation accuracy.
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Citation Information

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