A method for detecting the remaining quality of electrolyte

Abstract

The invention discloses a method for detecting the remaining mass of electrolyte. A standard sample with known specific heat capacity is taken as the first sample, and a control sample with the same proportion as the electrolyte of the battery to be tested is taken as the second sample. The sample and the second sample are heated to obtain the specific heat capacity of the second sample, so that the phase change of the second sample reaches its latent heat of phase change; the battery to be tested and the second sample are cooled to the same first temperature until they are frozen into a solid state, and then heated to the same temperature. The second temperature until it becomes liquid, according to the difference in heat capacity absorbed by the battery to be tested and the second sample, as well as the specific heat capacity and the latent heat of phase change, the mass difference Δm between the battery to be tested and the second sample is calculated; finally, the battery to be tested is obtained. Electrolyte remaining mass. The method can detect the remaining quality of the electrolyte of the lithium-ion battery instead of a certain substance, and can detect the remaining quality of the electrolyte of the battery without dismantling the original structure of the battery, and can monitor the battery life. In-situ testing of the process.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a method for detecting the residual mass of an electrolyte. Background technique [0002] A lithium-ion battery is a rechargeable battery that primarily relies on the movement of lithium ions between the positive and negative electrodes to function. Electrolyte is the "blood" of lithium-ion batteries. It plays the role of conducting ions between the positive and negative electrodes in the battery. It is the guarantee for lithium-ion batteries to obtain excellent performance such as high voltage and high power. The electrolyte is generally composed of organic solvents, electrolyte lithium salts, and additives, and is prepared in a certain proportion under certain conditions. [0003] Drying out of the electrolyte of lithium-ion batteries is a common aging mode. As the amount of electrolyte decreases, the available lithium ions in the electrolyte decrease, resulting ...

AI Technical Summary

Problems solved by technology

[0004] Currently commonly used electrolyte detection methods are generally very limited, for example: the detection of free acid, the detection of lithium element content is limited to a certain substance in the electrolyte and the detection at a certain stage, and in the traditional way due to The battery needs to be disassembled for detection, so it is very difficult to quantitatively measure the amount of remaining electrolyte without disassembling the battery

However, in situ testing of batteries throughout their lifetime is not possible due to the need to disassemble the batteries resulting in irrecoverable battery failure

Images