An early verification method for accelerated lithium evolution failure of lithium ion batteries

Abstract

The invention relates to the field of batteries, and provides an early verification method for accelerated lithium analysis failure of lithium ion batteries. The method includes: performing multiple charging and discharging cycle treatments on the battery to be tested at different temperatures; detecting the first concentration of target ions precipitated in the battery to be tested; based on the first concentration and the second concentration, predicting the lithium separation characteristics of the battery to be tested , wherein the second concentration is the concentration of the target ion that is precipitated after the same battery as the battery to be tested is subjected to multiple charge-discharge cycle treatments at a preset constant temperature. By performing multiple charge-discharge cycle treatments on the battery to be tested at different temperatures, the precipitation of target ions in the battery to be tested can be accelerated, thus solving the problem that the target ion precipitation in the prior art is extremely difficult when a single temperature is used for charge-discharge cycles. Time-consuming problem, and makes the precipitation of target ions more obvious. In addition, by introducing the second concentration as a comparison, the prediction process of the battery lithium separation characteristics can be quantified and more referential and reasonable.

Description

technical field [0001] The invention relates to the field of power batteries, in particular to an early verification method for accelerating the failure of lithium-ion batteries to analyze lithium. Background technique [0002] Lithium-ion batteries have been widely used in consumer electronics and power energy industries due to their advantages such as high energy density, long cycle life, environmental protection and safety. When lithium ions are charged at low temperature, high rate charging or overcharging, the inside of the battery will cause a large polarization, which will easily cause the battery to precipitate lithium, and a vicious cycle will occur during the long-term charging and discharging process, forming lithium dendrites and piercing the diaphragm , resulting in micro-short circuit or short circuit of the winding core, causing great harm to the safety performance of the battery. [0003] At present, the most commonly used method to predict the possibility o...

AI Technical Summary

Problems solved by technology

[0005] In the embodiment of the first aspect of the present application, by performing multiple charge-discharge cycle treatments on the battery to be tested at different temperatures, the precipitation of target ions in the battery to be tested can be accelerated, thereby solving the problem of using a single battery in the prior art. It is very time-consuming to release the target ions when the temperature is charged and discharged, and it makes the precipitation of the target ions more obvious

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