Pouch Storage Cell Tab Assembly to Prevent Foil Breakage
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing electrode foils in storage cells are prone to breakage and wrinkling, and the presence of foreign matter on the end faces can lead to short circuits, which are not effectively addressed by current technologies.
Innovation Solution
The storage cell design incorporates strip-shaped electrode tabs, a laminate film that accommodates the electrode body with exposed tabs, and an insulating coating on the end surface where tabs are formed, along with optional bending of the tabs to intersect the winding direction, and the use of rough surface processing on contact points to prevent foil damage and short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If electrode tabs are pressed down from both ends to gather them, then electrode tabs can be collected at the center, but electrode foil is pulled and broken or wrinkled
Solution Approach 1:
A pressing member is introduced as an intermediary tool to gather electrode tabs. The pressing member has a pressing surface that contacts the electrode tabs and applies force to move them toward the center without directly pulling the electrode foil, thus avoiding breakage and wrinkling while achieving tab gathering.
2Ease of manufacture
If electrode foil is located on the end face of the electrode body, then electrode tabs can be formed, but foreign matter may adhere and cause short-circuit
Solution Approach 1:
The electrode foil is extracted or removed from the end face of the electrode body. By taking out the electrode foil from the end face position, the surface is cleared of conductive material that could attract foreign matter and cause short-circuits, while electrode tabs can still be formed through other means.
3Productivity
If electrode foil is pulled from both ends to center portion, then electrode tabs are gathered, but electrode foil breakage occurs
Solution Approach 1:
The pressing member serves as a mediator that enables tab gathering without direct foil manipulation. Instead of pulling the electrode foil from both ends, the pressing member presses the tabs from both ends toward the center, achieving the same gathering effect while preserving foil integrity and manufacturing precision.
Data Source
AI summary
A storage cell includes an electrode body having a strip-shaped electrode tab, a laminate film that accommodates the electrode body such that a part of the electrode tab is exposed, and an insulating coating portion that is provided on an end face of the electrode body on which the electrode tab is formed and covers a portion of the end face on which the electrode tab is not formed.