Method for testing cohesive force of lithium ion battery pole piece

Abstract

The invention relates to a method for testing the cohesive force of a lithium ion battery pole piece, and belongs to the field of lithium batteries. The technical scheme adopted by the invention is asfollows: the method comprises the following steps: 1) taking a coated and dried single-sided pole piece, respectively punching small round pieces at the left, middle and right positions of the pole piece, weighing each round piece and recording the weight of each round piece; 2) putting the three groups of round pieces into a baking oven for baking, recording the mass after baking, respectively calculating the weight loss ratio of the small round pieces, and finally calculating the average value; (3) flatly placing the round pole pieces in the step (2) on a glass plate / steel plate, enabling acoating area to face upwards, and slowly scratching a square matrix on the pole pieces at a constant speed by using a special blade grid plotter; and 4) after the grids are drawn, lightly blowing offfloating powder on the surface by using a rubber pipette bulb, and calculating the falling area of the slurry. The method provided by the invention can conveniently and quickly reflect the advantagesand disadvantages of the adhesion stress of the pole piece, and through the quick detection method, the abnormity of the adhesion stress of the pole piece can be found in time, and the large loss caused by batch abnormity of the pole piece can be avoided.

Description

technical field [0001] The invention relates to a method for testing the adhesion force of lithium-ion battery pole pieces, belonging to the field of lithium batteries. Background technique [0002] The Nobel Chemistry Prize selection committee pointed out in the award speech that lightweight, rechargeable and powerful lithium-ion batteries have been used in various products such as mobile phones, laptop computers, and electric vehicles around the world, and can store energy from solar and wind energy. vast amounts of energy, thereby enabling a fossil fuel-free society. As the Royal Swedish Academy of Sciences said, today's lithium-ion battery is not just a high-tech research achievement, but a part of the world we take for granted, and even a huge industry. At present, the development of lithium battery technology has been focusing on cost control, improving the energy density and power density of lithium batteries, enhancing the safety of use, prolonging the service life ...

AI Technical Summary

Problems solved by technology

In the normal production process, the adhesion between the slurry and the current collector (foil) is good or bad. On the one hand, during the processing of the pole piece, the pole piece is dropped to produce Particles, which affects the self-discharge of the battery and poses a safety hazard; The quality of sheet adhesion will directly affect the cycle life of the battery and reduce the performance of the battery.

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