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Lithium ion battery hazard assessment method

A lithium-ion battery and dangerous technology, applied in the field of quantitative assessment of the safety of the working environment in which the battery is located, can solve problems such as difficulty in giving battery safety specifications, and achieve the effect of scientific fuzzy evaluation methods and accurate safety boundaries.

Active Publication Date: 2018-05-15
UNIV OF SCI & TECH OF CHINA
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  • Abstract
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Problems solved by technology

However, this classification is too broad and it is difficult to give proper safety regulations to the battery industry

Method used

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  • Lithium ion battery hazard assessment method

Examples

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Embodiment example 1

[0059] Implementation case 1: During the storage and transportation of lithium-ion batteries, the risk index of battery failure (S 1 , S 2 ) is assumed to be 5, in the failure mode, the thermal mode weight (W 1 ) accounted for 40%, while the mechanical mode (W 2 ) accounted for 60%. The degree of possibility of occurrence of thermal failure mode (L 1 ) is assumed to be 6, the degree of possibility of occurrence of mechanical failure mode (L 2 ) is assumed to be 5. At this time, the risk index of battery storage and transportation is:

[0060] HRN=L 1 ×S 1 ×W 1 +L 2 ×S 2 ×W 2 =27 (9)

[0061] If a temperature sensor is added to the protection system to detect the temperature, and a thermal management system is used to prevent the battery from overheating due to external heat, the risk control index (HCN 1 ) is assumed to be 0.6, and then a series of shock absorbing devices are used to reduce the impact of mechanical failure during battery storage and transportation...

Embodiment example 2

[0063] Implementation case 2: During the operation of pure electric vehicle batteries, the main failure modes that lead to battery failure are thermal mode (high temperature, flame), electrical mode (overcharge, overdischarge, internal short circuit), mechanical mode (acupuncture, extrusion, collision). These three modes cause the risk index of battery failure to be S1=7, S2=6, S3=5 respectively, and the corresponding weights are W 1 =30%, W 2 =60%, W 3 = 10%. The degree of possibility of occurrence of thermal failure mode (L 1 ) is assumed to be 4, the degree of possibility of occurrence of electrical failure mode (L 2 ) is assumed to be 6, the degree of possibility of occurrence of mechanical failure mode (L 3 ) is assumed to be 5. At this time, the risk index when the electric vehicle is running is:

[0064] HRN=L 1 ×S 1 ×W 1 +L 2 ×S 2 ×W 2 +L 3 ×S 3 ×W 3 =32.5 (11)

[0065] In the electric vehicle system, it is often necessary to install many protective de...

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Abstract

The invention provides a lithium ion battery hazard assessment method. The method comprises the following steps: obtaining a possible failure mode of the battery and a corresponding weight thereof byvirtue of an event tree analysis method, calculating the probability and hazard degree of each failure mode or basic event incidence to calculate a hazard value of a battery accident, and providing quantitative description for the lithium ion battery hazard. According to the method disclosed by the invention, the influence caused to the hazard value due to a control effect of a hazard control coefficient on the failure mode is also considered. According to the method, the hazards of the battery can be scientifically and accurately assessed, and the safety range of the battery is divided by virtue of a quantitative safety threshold.

Description

technical field [0001] The invention relates to the technical field of battery risk assessment, in particular to a method for quantitatively assessing the safety of the working environment where the battery is located. Background technique [0002] With the improvement of people's living requirements, lithium-ion batteries need faster charge and discharge rates and larger capacities in large-scale applications. The increase of these factors will greatly affect the safety of the battery itself. For example, the battery will generate a lot of heat during the charging and discharging cycle, coupled with the effects of limited space and time accumulation, it is easy to cause the temperature of the single battery to rise. When the normal operating temperature range of the battery is exceeded, the internal materials of the single battery will be damaged break down, increasing the pressure inside the battery. If the temperature cannot be controlled in time, it will cause thermal ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06Q10/06G06Q50/26
CPCG06Q10/0635G06Q50/265
Inventor 王青松黄沛丰陈昊东孙金华
Owner UNIV OF SCI & TECH OF CHINA
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