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Method for controlling risks of lithium-ion battery thermal runaway

A lithium-ion battery and a control method technology are applied in the field of control of the risk of thermal runaway of lithium-ion batteries, and can solve the problem that the physical, chemical, and thermal properties of the battery cannot be comprehensively considered.

Active Publication Date: 2017-06-09
TIANJIN QINGYUAN ELECTRIC VEHICLE
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Problems solved by technology

However, the existing thermal runaway research methods often consider the macroscopic chemical reaction and temperature evolution after the thermal runaway of the battery, but cannot comprehensively consider the physical and chemical thermal properties of the battery and the microstructure characteristics of the electrode. By studying the emergence of internal local high temperature points, control The danger of battery thermal runaway

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  • Method for controlling risks of lithium-ion battery thermal runaway
  • Method for controlling risks of lithium-ion battery thermal runaway
  • Method for controlling risks of lithium-ion battery thermal runaway

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Embodiment Construction

[0055] In order to further understand the invention content, characteristics and effects of the present invention, the following examples are given, and detailed descriptions are as follows in conjunction with the accompanying drawings:

[0056] like figure 1 As shown, the present invention provides a method for controlling the risk of thermal runaway of a lithium-ion battery, which includes the following steps:

[0057] S1: Apply X-ray scanning method or FIB-SEM scanning method, and process the scanned image data to generate a three-dimensional microstructure of lithium-ion battery electrodes;

[0058] S2: Establish an electrochemical-thermal coupling model inside the three-dimensional microstructure of lithium-ion battery electrodes, which is used to simulate the material and charge transport process, chemical reaction process, and heat generation and heat transfer process; the electrochemical-thermal coupling model mainly includes The governing equation of lithium ion tran...

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Abstract

The invention relates to the technical field of batteries and discloses a method for controlling risks of lithium-ion battery thermal runaway. The method for controlling the risks of the lithium-ion battery thermal runaway includes the steps of firstly, using an X-ray scanning method or FIB-SEM scanning method, and processing image date obtained by scanning to generate a three-dimensional microstructure of an electrode of a lithium-ion battery; secondly, constructing an electrochemical-thermal coupling model in the microstructure for simulating a matter and charge transport process, a chemical reaction process and a thermal generation and transfer process; lastly, using the electrochemical-thermal coupling model to compute the highest local temperature in the microstructure under different discharging rates so as to obtain a risk result leading to the thermal runaway so as to control a lithium-ion battery correspondingly. The method for controlling the risks of the lithium-ion battery thermal runaway has the advantages that impacts of an electrode microstucture on matter transport, thermal generation and thermal transfer are taken into account, the risks of thermal runaway of lithium-ion batteries with different microstructures can be analyzed, compared and controlled, and the method plays an important guiding role in design of preventing the thermal runaway of the lithium-ion batteries.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a method for controlling the risk of thermal runaway of a lithium-ion battery. Background technique [0002] With the gradual development of new energy electric vehicles and hybrid vehicles, lithium-ion power batteries have been more and more widely used. Lithium-ion batteries have the advantages of high energy density and good voltage platform. However, due to the relatively active chemical properties of lithium elements, thermal runaway accidents are prone to occur when failures such as high temperature, short circuit, overcharge or mechanical impact occur. Battery thermal runaway refers to the loss of control of the internal chemical reaction of the battery, and the rapid conversion of chemical energy into internal energy, causing the temperature of the battery to rise rapidly in a short period of time, and even combustion and explosion, which will pose a great threat to the...

Claims

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Application Information

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IPC IPC(8): H01M10/42H01M10/0525B60L11/18
CPCB60L58/10B60L58/24H01M10/0525H01M10/425H01M2010/4271Y02E60/10Y02T10/70
Inventor 田瑞华窦汝振李顶根
Owner TIANJIN QINGYUAN ELECTRIC VEHICLE
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