Method for monitoring performance of battery cell by pole piece symmetrical internal resistance

Abstract

This invention discloses a method for monitoring the symmetrical internal resistance of electrode sheets to assess battery cell performance, relating to the field of battery technology. The method is used to test the symmetrical internal resistance of electrode sheets after rolling. The process includes sequentially coating, drying, rolling, and die-cutting electrode sheets to prepare electrodes for stacked battery cells. Each electrode sheet includes tabs extending from a current collector. The electrode sheets and separator are placed in a preset dry environment and immersed in electrolyte for a preset time. The electrode sheets and separator are alternately stacked to form an electrode assembly. The electrode assembly is flattened. Probes are then used to contact the tabs of two adjacent electrode sheets to measure and obtain the resistance between the electrode sheets. The method provided by this invention can quickly and accurately detect the symmetrical internal resistance of electrode sheets after rolling and before cell assembly, enabling early identification of abnormal electrode impedance, effectively avoiding the risk of batch battery scrap, and reducing production costs. Simultaneously, it can provide data support for optimizing coating processes, improving cell consistency and product reliability.

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