In-situ detection method for content of electrolyte inside lithium battery

Abstract

The invention discloses an in-situ detection method for the content of electrolyte inside a lithium battery. The in-situ detection method comprises the steps: respectively producing a reference battery and a plurality of standard batteries for a to-be-detected battery; simultaneously cooling the to-be-detected battery, the reference battery and the plurality of standard batteries with different electrolyte contents, and respectively detecting surface temperatures; establishing a standard curve of the plurality of standard batteries; establishing a scatter diagram of the plurality of standard batteries; carrying out linear fitting on the scatter diagram of the plurality of standard batteries to obtain a quantitative relation between peak areas corresponding to the standard batteries and theelectrolyte contents of the standard batteries; establishing a temperature curve of the to-be-detected battery, and obtaining a peak area corresponding to the to-be-detected battery; and calculatingthe electrolyte content of the to-be-detected battery. The residual mass of the electrolyte in a lithium ion battery used for a period of time can be reliably detected under the condition that the battery is not destructed, so that the in-situ detection method has great production practice significance.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to an in-situ detection method for electrolyte content inside a lithium battery. Background technique [0002] At present, lithium-ion batteries are widely used in various fields such as mobile phones, notebook computers, power tools, electric vehicles, and energy storage systems due to their unique performance advantages. Different fields have different emphasis on battery performance requirements, but in general, the market's requirements for energy density, safety performance and cycle life of lithium-ion batteries are constantly improving. [0003] For lithium-ion batteries, during the cycle aging process, the electrolyte will be consumed continuously, part of which is used for reforming and repairing reactions of the solid electrolyte interfacial film (SEI) film, and part of it may be consumed due to other side reactions . Among them, if the electrolyte is excessively consu...

AI Technical Summary

Problems solved by technology

The conventional analysis method is: after the battery is dissected, the electrolyte is directly taken for analysis. However, since the electrolyte has been immersed in the pores of the electrodes and the diaphragm, and the electrolyte has high volatility, it is difficult to collect, so it cannot be accurately measured. Residual mass of electrolyte in Li-ion batteries that have been used for some time

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