Lithium ion battery thermal runaway spreading simulation method and device

Abstract

The invention discloses a lithium ion battery thermal runaway spreading simulation method and device. The invention relates to a lithium ion battery thermal runaway spreading simulation method and system. The method comprises the following steps: firstly, establishing a lithium ion battery normal heat generation prediction model and a lithium ion battery thermal runaway heat generation predictionmodel; setting a simulation monomer for simulating the lithium ion battery based on a wireless energy transmission principle of a primary side and a secondary side; then, heat generation estimation iscarried out on the lithium ion battery by utilizing the established heat generation model; calculating the heat generation power by utilizing heat generation estimation; the heat generation current is calculated by utilizing the heat generation power of the lithium ion battery; calculating expected values of corresponding parameters of a primary side by taking the calculated heat generation current of the lithium ion battery as a secondary side current demand value; corresponding parameters of the primary side are adjusted to simulate heat generation of the heat generation element; and judging thermal runaway spreading through the obtained surface or internal temperature distribution of the simulation monomer to complete lithium ion battery thermal runaway spreading simulation verification, thereby evaluating the safety of the lithium ion battery system and realizing lithium ion battery module thermal runaway management and control experiment verification.

Description

technical field [0001] The invention relates to the field of battery safety, in particular to a method and device for simulating thermal runaway spread of a lithium ion battery. Background technique [0002] The thermal runaway problem of lithium-ion batteries is a key problem restricting the industrialization of the electric vehicle industry. The thermal runaway of a single battery may lead to thermal spread, which will lead to the safety of the module, battery box and even the whole vehicle where the thermally runaway battery is located. The problem of heat spread caused by thermal runaway is studied and evaluated. [0003] At present, real lithium-ion battery cells and modules are mostly used to simulate the thermal spread process caused by thermal runaway, but this experimental method is a destructive experiment. The cells and modules used in the test cannot be reused, and during the experiment The resulting high temperature, flame and other processes may cause safety p...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the safety problem that the simulation of the existing thermal runaway propagation process mostly uses real lithium-ion battery cells and modules, which cannot be reused and is easily caused by the experimental process, the present invention provides a simulation method for the thermal runaway propagation of lithium-ion batteries, through The primary side and secondary side method of wireless energy transmission control simulates the thermal runaway of a single cell in the battery module of the lithium-ion battery. According to the actual temperature sampling results of the simulated single cell, it is determined whether the thermal runaway will lead to thermal spread, so as to evaluate the lithium-ion battery. The safety of the system, and the experimental verification of thermal runaway control of lithium-ion battery modules

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