Battery formation gas detection device and method

Abstract

The invention relates to the technical field of battery testing, and discloses a battery formation gas detection device and method. The battery formation gas detection device comprises a liquid storage device, a transparent bent pipe and a gas chromatography-mass spectrometer, wherein the transparent bent pipe is filled with liquid, one end of the transparent bent pipe is selectively communicatedwith an air outlet of a to-be-formed battery, the other end of the transparent bent pipe is communicated with the liquid storage device communicated with the atmosphere, and a pipe body between two ends of the transparent bent pipe is lower than any end of the transparent bent pipe; the gas chromatography-mass spectrometer is selectively communicated with one end, communicated with the air outletof the to-be-formed battery, of the transparent bent pipe; when the transparent bent pipe is communicated with the to-be-formed battery, the forming gas in the to-be-formed battery is conveyed into the transparent bent pipe, and part of liquid is pressed into the liquid storage device; when the gas chromatograph-mass spectrometer is communicated with the transparent bent pipe, liquid in the liquidstorage device flows back to the transparent bent pipe, so that the formed gas in the transparent bent pipe is pressed into the gas chromatograph-mass spectrometer, and the volume, the components andthe content of each component of the formed gas can be conveniently and quickly detected.

Description

technical field [0001] The invention relates to the technical field of battery testing, in particular to a battery formation gas detection device and method. Background technique [0002] Battery formation mainly refers to the formation of an SEI film (solid electrolyte cross-sectional film) on the surface of the negative electrode when the lithium battery is charged for the first time, accompanied by the generation of formation gas (CO 2 、H 2 etc.) process. The quality of the SEI film has an important impact on the cycle life, stability, self-discharge and safety of lithium batteries. [0003] During the formation process of the battery, the volume, composition and content of each composition of the formation gas can reflect the quality of the SEI film. Therefore, the research on the volume, composition and content of each component of the formed gas can be used as a guiding basis for optimizing the materials of each component of the lithium battery, thereby providing an...

AI Technical Summary

Problems solved by technology

However, in the actual detection and analysis of battery formation gas, the existing battery formation gas detection devices can only realize the detection of the volume of the formation gas, but cannot quickly detect the composition of the formation gas and the content of each component. Gas detection and analysis is a big inconvenience

Moreover, in order to detect the components and the content of each component of the formed gas, the existing battery formed gas detection device generally uses an airbag to collect the gas, and then transfers the airbag to a gas phase analysis device for analysis and detection, and the operation is complicated.

In addition, in the existing pouch battery formation process, when the pouch battery is squeezed by the existing battery pressing device to discharge the formation gas in the pouch battery, there is a problem that the formation gas is not completely discharged, which makes the final measurement The volume of the formed gas obtained is smaller than the actual value, which affects the detection and analysis accuracy of the formed gas, which is extremely unfavorable for the development of optimized lithium battery components and materials

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