Battery mass spectrometry sampling system and battery testing device

Abstract

The invention discloses a battery mass spectrometry sampling system and a battery testing device. The battery mass spectrometry sampling system includes: a battery testing device for placing a battery, a battery testing system for providing working parameters required for the battery, and a battery testing system for testing The mass spectrometer for the mass spectrometry analysis of the gas produced by the battery can bring the gas produced by the battery to the carrier gas sampling system of the mass spectrometer through the joint action of the pressure difference and the carrier gas; among them, the battery test device only passes its outlet gas and carrier gas The sampling system is connected, and the carrier gas and product gas are mixed in the carrier gas sampling system. The above battery testing device is only connected to the carrier gas sampling system through its gas outlet, and the carrier gas and produced gas are mixed in the carrier gas sampling system. to the mass spectrometer. The above-mentioned battery mass spectrometry sampling system can directly perform qualitative and quantitative in-situ analysis of differential electrochemical mass spectrometry on large-capacity batteries such as commercial soft packs and cylindrical batteries, and ensures the accuracy of test results.

Description

technical field [0001] The invention relates to the technical field of battery testing, and more particularly, to a battery mass spectrometry sampling system and a battery testing device. Background technique [0002] During the working process of the battery, the electrode interface is prone to irreversible reactions, releasing flammable gases, such as methane, ethylene, hydrogen, etc., resulting in battery failure or even fire and explosion, posing safety problems. In order to solve the safety problems caused by battery failure, it is necessary to study the gas production at the battery electrode interface online and analyze the root cause of gas release. [0003] Differential electrochemical mass spectrometry, as an on-line electrochemical analysis technique, can qualitatively and quantitatively study the consumption and release of gaseous products at the battery electrode interface in situ. Differential electrochemical mass spectrometry mainly has two injection modes: m...

AI Technical Summary

Problems solved by technology

However, the carrier gas tends to generate eddy currents in the battery testing device, causing some of the produced gas to not be completely carried into the mass spectrometer by the carrier gas, especially for battery testing devices with a large dead volume, which easily leads to low accuracy of test results

[0005] In addition, if the fluctuation of the gas production per unit time of the battery is greater than the fluctuation of the carrier gas flow rate, especially for large-capacity batteries such as commercial pouch batteries and cylindrical batteries, the gas calibration coefficient cannot be regarded as a constant at this time, resulting in large differences in test results. In addition, the amount of electrolyte used in large-capacity batteries such as commercial pouch batteries and cylindrical batteries is large, and the volatile electrolyte is more likely to enter and contaminate the mass spectrometer, affecting the service life of the mass spectrometer

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