Pouch Battery Electrode Assembly Taping for Thickness Balance
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Solution Overview
Problem
Existing secondary battery manufacturing processes face challenges in ensuring uniform thickness and adhesion of electrode active material layers, leading to issues with insertability and heat exposure characteristics, particularly in pouch-type batteries.
Innovation Solution
A method involving the sequential attachment of top, body, and side tapes around the electrode assembly to compensate for reduced thickness in the sliding area, improving adhesion and thickness balance, and enhancing insertability and heat exposure characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If electrode active material layers are coated on current collectors, then battery capacity is improved, but thickness uniformity deteriorates due to reduced thickness in sliding areas
Solution Approach 1:
The patent applies different treatments to different regions of the electrode assembly. Specifically, tapes are selectively attached to local regions (sliding areas) where thickness reduction occurs, rather than treating the entire electrode uniformly. This localized approach compensates for thickness variations in specific areas while preserving the high capacity active material layers in other regions.
Solution Approach 2:
The patent performs tape attachment as a preliminary action before final battery assembly and testing. By pre-compensating for thickness reduction in sliding areas through tape attachment, the electrode assembly is prepared in advance to achieve uniform thickness characteristics, preventing potential issues during subsequent manufacturing steps.
2Ease of manufacture
If electrode assembly is inserted into pouch, then battery packaging is completed, but insertability deteriorates due to non-uniform thickness causing deformation
Solution Approach 1:
The patent addresses insertability issues by applying tapes locally to sliding areas where thickness reduction causes deformation. This localized compensation ensures that the electrode assembly maintains uniform thickness characteristics in critical regions, enabling smooth insertion into the pouch without deformation or sticking.
3Reliability
If electrode assembly undergoes heat exposure, then battery testing is performed, but heat exposure characteristics deteriorate due to non-uniform thickness causing uneven heating
Solution Approach 1:
The patent improves heat exposure characteristics by applying tapes to local regions with thickness reduction. This localized thickness compensation ensures uniform heat distribution during thermal testing, preventing hot spots in sliding areas and enabling valid reliability assessment under controlled temperature conditions.
Data Source
AI summary
A method of manufacturing a secondary battery includes preparing an electrode assembly including a first electrode plate, a second electrode plate, and a separator, attaching a top tape to an upper end portion of the electrode assembly, attaching a bottom tape to surround a lower end portion of the electrode assembly, attaching a body tape to surround the upper end portion of the electrode assembly, and inserting the electrode assembly into a pouch, wherein each of the first and second electrode plates includes a current collector, an active material layer on the current collector, an uncoated portion at an end of the current collector adjacent to the electrode active material layer, and an electrode tab at an end portion of the uncoated portion.