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A performance evaluation method and evaluation system for flame-retardant materials for secondary batteries

A technology of flame-retardant materials and secondary batteries, which is applied in the field of electrochemical power sources 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: 2021-02-26
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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  • A performance evaluation method and evaluation system for flame-retardant materials for secondary batteries
  • A performance evaluation method and evaluation system for flame-retardant materials for secondary batteries
  • A performance evaluation method and evaluation system for flame-retardant materials for secondary batteries

Examples

Experimental program
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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 respectively: 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...

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 an evaluation system for a flame retardant material for a secondary battery, the method comprising: determining the heat Q generated by the secondary battery without the flame retardant material under thermal runaway conditions; determining the generation of 1.1 ‑2.0 times the amount of combustion gas used for the amount of heat Q; the flame retardant material is burned with the amount of gas; an equation for evaluating the flame retardant performance is constructed; the system includes: a heat calculation module for determining that the flame retardant material is not installed The heat Q generated by the secondary battery under thermal runaway conditions; the spray gun, which is equipped with gas fuel, and the heat generated when the gas fuel is burned is Q; the memory is used to record the amount of gas fuel in the spray gun; evaluation The module is used to construct a flame retardant performance evaluation equation, so as to evaluate the performance of the flame retardant material; the technical solution provided by the present invention guides the selection of the flame retardant material for the secondary battery, and further reduces the thermal runaway of the secondary battery. risk factor.

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 Patents(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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