Unlock instant, AI-driven research and patent intelligence for your innovation.

Lithium ion battery aerogenesis dynamics experiment modeling and calculating method

A lithium-ion battery and aerodynamics technology, which is applied in the field of lithium-ion battery safety research, and can solve the problem that there is no quantitative calculation of battery gas production dynamics.

Pending Publication Date: 2021-02-02
UNIV OF SCI & TECH OF CHINA
View PDF2 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, in order to measure the gas production rate and volume of the battery, a pressure tank with good airtightness is often used to study the thermal runaway characteristics of the lithium-ion battery. The pressure increase inside the pressure tank is an intuitive manifestation of the gas generation of the lithium-ion battery, but there is no available A method for quantitatively calculating battery gas production kinetics is proposed

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Lithium ion battery aerogenesis dynamics experiment modeling and calculating method
  • Lithium ion battery aerogenesis dynamics experiment modeling and calculating method
  • Lithium ion battery aerogenesis dynamics experiment modeling and calculating method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0077] According to above-mentioned embodiment, utilize the standard battery test pressure pot of accelerated calorimeter and 400mL, to certain Li(Ni x co y mn z )O 2 / Graphite's 18650 battery has carried out a thermal runaway experiment, and measured the battery surface temperature, pressure tank temperature and tank internal pressure data. figure 1 It is an experimental design diagram, and Figure 2 (a) and (b) are the battery temperature, pressure tank surface temperature and pressure tank internal pressure curves under the conditions of 100% and 50% state of charge of the battery, respectively. After the experiment, weigh the mass loss m of the tank and the battery system a , the mass loss is considered to be the total gas production of the battery during thermal runaway, and is listed in column 4 of Table 1. The gas production of 100% and 50% SOC batteries are 6.629±0.525g and 6.329±0.612g respectively . The peak pressures of 100% and 50% SOC cells are 2.4MPa and 1.9M...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a lithium ion battery aerogenesis dynamics experiment modeling and calculating method. The method comprises the following steps: firstly, charging a battery to a to-be-studiedstate of charge; then carrying out a thermal runaway experiment on the lithium ion battery by using a pressure tank and an acceleration calorimeter; measuring the temperature change of the battery andthe pressure tank in the thermal runaway process and the gas pressure change condition in the pressure tank caused by the thermal runaway reaction of the lithium ion battery; and finally, based on the reactivity model and an Arrhenius formula, establishing a lithium ion battery aerogenesis kinetic model by utilizing the temperature and pressure data. The creation of heat insulation conditions ensures that the pressure tank and the battery system can be regarded as a lumped parameter model in the early stage of thermal runaway, a gas production kinetic model and kinetic parameters are solved,and the vacancy of a gas production rate test technology of the battery in the thermal runaway process is made up.

Description

technical field [0001] The present invention relates to the technical field of lithium-ion battery safety research, specifically relates to a lithium-ion battery gas production dynamics experimental modeling and calculation method, and proposes an experimental method and production method for studying the characteristics of gas production in the thermal runaway process of lithium-ion batteries. Gas measurement technology method. Background technique [0002] In recent years, lithium-ion batteries have become the most common secondary batteries in daily life, and are widely used in mobile phones, portable computers, aerospace and electric vehicles. However, due to its high energy density and flammable and explosive material composition, lithium-ion batteries still have certain safety problems, mainly manifested in the danger of thermal runaway or fire when the battery experiences overcharge, overdischarge, mechanical shock and overheating. During the thermal runaway process ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/28G01R31/367G06F113/08G06F119/14G06F119/08
CPCG06F30/28G01R31/367G06F2113/08G06F2119/14G06F2119/08Y02E60/10
Inventor 王青松毛斌斌秦鹏段强领孙金华
Owner UNIV OF SCI & TECH OF CHINA