Performance evaluation method and system for flame-retardant material for secondary cell

A technology of flame retardant materials and secondary batteries, applied in the field of electrochemical power supply and energy storage, can solve the problems of large thickness and weight of flame retardant materials, waste of materials, and large space occupied by flame retardant materials, so as to reduce the volume fraction and Parts by mass, reducing the risk factor, and improving the effect of flame retardant performance

Active Publication Date: 2017-09-29
CHINA ELECTRIC POWER RES INST +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Most of the existing flame-retardant materials are placed directly around the secondary battery in the form of sheets. On the one hand, due to the lack of performance measurement of the thermal runaway state and consequences of the secondary battery, it is impossible to accurately obtain the maximum temperature generated near the battery surface after the thermal runaway of the battery. The heat cannot effectively prevent the flame and high temperature generated by thermal runaway; on the other hand, because the thickness and weight of the flame-retardant material are relatively large, it not only causes waste of materials, but also makes the flame-retardant material occupy a large space in the battery pack; therefore , the existing technology is difficult to realize the reliable selection of flame retardant materials for secondary batteries, and the risk factor of thermal runaway of secondary batteries is high

Method used

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  • Performance evaluation method and system for flame-retardant material for secondary cell
  • Performance evaluation method and system for flame-retardant material for secondary cell
  • Performance evaluation method and system for flame-retardant material for secondary cell

Examples

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Effect test

example 1

[0121] (1) Under the current rate of 1C, adjust the SOC state of charge of the secondary battery without flame retardant material to 100% with a battery charge and discharge meter, and weigh m 0 =234g;

[0122] (2) In the "mCp" mode, use an adiabatic acceleration calorimeter to measure the specific heat capacity Cp of the secondary battery without flame retardant materials 0 =1.0121J(g·k) -1 ;

[0123] (3) Set 5 temperature sensors on the surface of the secondary battery without flame retardant materials, corresponding to 5 points on the secondary battery: P1-P5; P1 is the center of one side (ab side) of the battery, P2 , P3, P4 and P5 are respectively located on the circle with P1 as the center and R=35mm as the radius, P2: (-20,22), P3: (20,22), P4: (-20,-22), P5: (20,-22); P1-P5 points correspond to the measured temperature as T1-T5, Tm=max(T1, T2, T3, T4, T5);

[0124]Overcharge the secondary battery at a current rate of 2C in an adiabatic environment, the temperature ...

example 2

[0144] (1) Under the current rate of 1C, adjust the SOC state of charge of the secondary battery without flame retardant material to 100% with a battery charge and discharge meter, and weigh m 0 =457g;

[0145] (2) In the "mCp" mode, use an adiabatic acceleration calorimeter to measure the specific heat capacity Cp of the secondary battery without flame retardant materials 0 =1.3827J(g·K) -1 ;

[0146] (3) Set 5 temperature sensors on the surface of the secondary battery without flame retardant materials, corresponding to 5 points on the secondary battery: P1-P5; P1 is the center of one side (ab side) of the battery, P2 , P3, P4 and P5 are respectively located on the circle with P1 as the center and R=40mm as the radius, P2: (-33,50), P3: (33,50), P4: (-33,50), P5 : (33,-50); P1-P5 points correspond to the measured temperature as T1-T5, Tm=max(T1, T2, T3, T4, T5);

[0147] Overcharge the secondary battery at a current rate of 2C in an adiabatic environment, the temperature...

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Abstract

The invention provides a performance evaluation method and system for a flame-retardant material for a secondary cell. The method comprises the following steps: determining heat Q generated by a secondary cell which is not provided with a flame-retardant material under a thermal runaway condition; determining the use amount of combustion gas when heat which is 1.1-2.0 times of the heat Q is generated; burning the flame-retardant material by virtue of gas according to the use amount; and constructing an equation for evaluating the flame retardance. The system comprises a heat calculation module, a spray gun, a storage and an evaluation module, wherein the heat calculation module is used for determining the heat Q generated by the secondary cell which is not provided with the flame-retardant material under a thermal runaway condition; the spray gun is filled with a gas fuel, and the heat generated by the combustion of the gas fuel is Q; the storage is used for recording the use amount of the gas fuel in the spray gun; and the evaluation module is used for constructing the equation for evaluating the flame retardance, so as to evaluate the performance of the flame-retardant material. According to the technical scheme provided by the invention, the optimization of the flame-retardant material for the secondary cell is guided, and the danger coefficient of thermal runaway of the secondary cell is further decreased.

Description

technical field [0001] The invention relates to the fields of electrochemical power sources and energy storage, in particular to a performance evaluation method and evaluation system for flame-retardant materials for secondary batteries. Background technique [0002] With the development of society, environmental issues have attracted more and more attention from human beings. It is imperative to develop clean energy to replace traditional fossil energy. Secondary batteries, as a new type of clean high-energy power source, are widely used in water power, fire power, wind power and solar power. Energy storage power systems such as power stations, as well as various fields of electric tools, military equipment and aerospace, have greatly promoted the improvement of the environment. [0003] However, during use, secondary batteries have potential safety hazards. Under certain extreme conditions or abuse (such as overcharging, high temperature, acupuncture, short circuit, drop, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N31/12
CPCG01N31/12
Inventor 高飞杨凯王康康陈晰范茂松刘皓尹秀娟张明杰耿萌萌刘超群
Owner CHINA ELECTRIC POWER RES INST
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