A fixture and method for measuring the lithium-embedded impedance of the negative pole piece of a high-precision lithium-ion battery

Abstract

The invention provides a high-precision fixture and method for measuring the lithium-embedded impedance of the negative pole piece of a lithium-ion battery, including a sealed cabin device, a lithium piece interface leveling and fixing device, an electrode spacing adjustment device, and a pole piece fixing device to be tested; The sealed cabin device is used to ensure that the measurement environment is in an anhydrous and oxygen-free environment; the lithium sheet interface is flat and the fixing device is used to install the lithium sheet reference electrode, and through the upper flat thread, the lithium sheet surface is flat to ensure the electrode spacing Keep consistent and smooth the surface while using high pressure to ensure good contact between the lithium sheet and the electrode fixing device; the electrode spacing adjustment device adjusts the interface spacing between the reference electrode and the tested electrode according to the interface flatness of the tested electrode, Ensure that the pole spacing between different groups remains consistent; the pole piece fixing device to be tested uses microporous negative pressure to fix the pole piece to be tested to ensure good contact between the current collector of the pole piece and the lead wire. The method for measuring the high-precision impedance of the lithium battery negative pole piece according to the present invention can quickly evaluate the impedance of the negative electrode formula between different groups, can significantly reduce the group screening time and evaluation costs, improve the economic benefits of the enterprise, and is beneficial to a wide range of applications. The application in production has great practical significance in production.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, and in particular relates to a fixture and method for measuring the impedance of lithium-embedded lithium-ion battery negative electrodes with high precision. Background technique [0002] After more than 20 years of development, lithium-ion batteries have a rich industrial chain and a diversified development trend of battery models. The performance of batteries can meet the needs of many industries for power supplies. At present, they have been widely used in electric vehicle power supplies, communication base station power supplies, communication tools and In the field of electric tools and other fields, the electrochemical performance of lithium-ion batteries directly affects its application fields, especially the impedance of lithium-ion batteries, which seriously affects the ambient temperature and heat preservation measures of battery applications. The impedance of lithium-ion bat...

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Problems solved by technology

[0004] In view of this, the present invention aims to propose a fixture and method for measuring the lithium-intercalation impedance of the negative pole piece of a high-precision lithium-ion battery, so as to solve the problem of inaccurate measurement and isolation caused by the fluctuation of the reference electrode between different groups. Technical difficulties that cannot be eliminated due to membrane effects

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