Stacked Electrode Tape Rolling to Prevent Wrinkles and Bubbles
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Solution Overview
Problem
Conventional taping devices for stacked electrode assemblies face issues such as tape separation, wrinkles, and bubble generation during the taping process, which can lead to defects in battery cells.
Innovation Solution
A taping device comprising a support part, a vacuum adsorption part, a gripper part, and a taping mechanism part, which guides the movement of the tape, tensions it, and pressurizes it to adhere effectively to the stacked electrode assembly, preventing separation, wrinkles, and bubble formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the tape is pressed firmly to adhere to the electrode assembly, then adhesion strength improves, but wrinkles and bubbles may form
Solution Approach 1:
The pressing part uses a roller that rotates during the pressing operation. This dynamic rolling action gradually presses the tape onto the electrode assembly, allowing air to escape and preventing bubble formation while still achieving strong adhesion. The rotational motion distributes pressure dynamically, avoiding the static pressure concentration that causes wrinkles
Solution Approach 2:
The pressing mechanism uses a cylindrical roller with a curved surface instead of a flat pressing plate. This curvature allows the pressure to be distributed more evenly across the tape surface during rotation, preventing localized high-pressure spots that would cause wrinkles and bubbles while maintaining overall adhesion strength
2Ease of manufacture
If the tape is not tensioned during application, then the application process is simpler, but the tape may separate from the electrode assembly
Solution Approach 1:
The gripper part applies preliminary tension to the tape ends before and during the pressing operation. This pre-tensioning ensures the tape remains firmly attached to the electrode assembly throughout the process, preventing separation without requiring complex tensioning mechanisms, thus maintaining manufacturing simplicity while improving adhesion reliability
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The proposed taping device and method ensure effective fixation of the tape to the stacked electrode assembly, improving taping quality by preventing tape separation, wrinkles, and bubble generation, and ensuring a stable adhesive bond.
Implementation Method 1
a vacuum adsorption part adsorbing and fixing the non-pressure-sensitive adhesive side of the tape
Data Source
AI summary
A taping device for a stacked electrode assembly includes a support part, a vacuum adsorption part, a gripper part, and a taping mechanism part. The support part corresponds to the central portion of the tape to be attached to the stacked electrode assembly and the lateral side of the stacked electrode assembly. The vacuum adsorption part adsorbs and fixes the non-pressure-sensitive adhesive side of the tape. The gripper part further fixes the tape by operating to grip the end of the tape and the taping mechanism part attaches the tape to the upper surface and the lower surface of the stacked electrode assembly by moving along the upper surface and the lower surface of the stacked electrode assembly from the upper portion and the lower portion of the support part. A method including the same is also provided.