Battery safety assessment method

Abstract

The invention relates to a battery safety assessment method, which is used for assessing the safety level of a to-be-tested battery in a non-destructive mode, and comprises the following steps: 1) carrying out constant-current discharge test on the to-be-tested battery under different aging degrees under an adiabatic condition to obtain corresponding battery voltage, temperature and capacity data; 2) processing the obtained battery voltage and temperature data to obtain a differential thermal volt-ampere curve; 3) processing the acquired battery voltage and capacity data to obtain a capacity increment curve; 4) respectively extracting the characteristics of the differential thermal volt-ampere curve and the capacity increment curve; and 5) calculating the extracted features to realize battery safety evaluation. Compared with the prior art, the method has the advantages of being non-destructive, simple, reliable and the like.

Description

technical field [0001] The invention relates to the technical field of battery state monitoring, in particular to a battery safety evaluation method. Background technique [0002] In the context of carbon neutrality, the energy structure is constantly upgrading and transforming towards green and sustainable energy. New energy vehicles stand out with their unique advantages. Lithium-ion batteries are widely used in electric vehicles due to their high energy density and long cycle life. However, in recent years, with the explosive growth of the number of electric vehicles, Electric vehicle accidents are also on the rise. Among them, battery safety issues are the main factors leading to electric vehicle safety accidents. The new battery will undergo a series of strict tests before leaving the factory to ensure its safety performance, but with continuous use in practice, side reactions inside the battery will continue to occur, which will not only lead to battery capacity deca...

AI Technical Summary

Problems solved by technology

The new battery will undergo a series of strict tests before leaving the factory to ensure its safety performance, but with continuous use in practice, side reactions inside the battery will continue to occur, which will not only lead to battery capacity decay, shorten The mileage will also reduce the safety of the battery and cause more serious safety accidents

[0003] At present, there are few methods for evaluating the safety of lithium-ion batteries, and they are basically destructive. The current main way to measure battery safety is to perform thermal runaway tests in calorimeters to evaluate the safety of batteries, but this is destructive to batteries. However, in order to realize the safe management of batteries in practical applications, it is necessary to use non-destructive methods for evaluation. However, it is very difficult to evaluate battery safety non-destructively at present.

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