Pouch Cell Tab Connection Layout With Stepped Top-Wall Sealing
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Solution Overview
Problem
The existing cell design is bulky due to the space occupied by the inner electrode tab and its connection to the outer electrode tab, limiting its adaptability to smaller electrical devices.
Innovation Solution
The cell design incorporates a packaging bag with a main body and an edge sealing portion, where the inner electrode tab is connected to the electrode assembly and the outer electrode tab extends out, utilizing a top wall with distinct height portions to minimize overall size by positioning the connection corresponding to the taller portion, allowing external devices to utilize the space between these portions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the inner electrode tab and outer electrode tab connection structure is used, then the cell can function properly, but the cell size becomes large due to occupied receiving space
Solution Approach 1:
The patent utilizes the thickness direction (Z-axis) of the packaging bag to arrange the inner electrode tab and connection structures. By making the top wall extend in the thickness direction with different heights at different positions, the connection structures are arranged in the thickness dimension rather than occupying planar space, thereby reducing the cell's overall footprint while maintaining functionality.
Solution Approach 2:
The top wall of the packaging bag is designed with different heights at different positions: a first height at the first position and a second height at the second position, where the second height is greater than the first height. This local variation in wall height allows optimized arrangement of connection structures at specific locations without increasing overall cell size, as the taller portion only exists where needed for connections.
2Reliability
If the inner electrode tab occupies receiving space for connection, then electrical connection is achieved, but the application range to electrical devices is limited
Solution Approach 1:
By arranging the inner electrode tab and outer electrode tab connection structures in the thickness direction of the packaging bag rather than in the planar receiving space, the patent reduces the footprint occupied by connection components. This dimensional reorganization allows the cell to fit into smaller electrical devices while maintaining proper electrical connections, thereby expanding adaptability to various device applications.
Solution Approach 2:
The top wall is designed with asymmetric height distribution: a first height at the first position and a greater second height at the second position. This asymmetric structure optimizes the arrangement of connection components at specific locations, allowing the cell to maintain proper electrical connections while minimizing overall space occupation, thus improving adaptability to different electrical device form factors.
Data Source
AI summary
A cell including an electrode assembly, a packaging bag, an inner electrode tab, and an outer electrode tab. The packaging bag includes a main body and an edge sealing portion, the electrode assembly and the inner electrode tab being received in the main body. The edge sealing portion is connected to a top wall of the main body, the other end of the outer electrode tab extends out of the packaging bag from the edge sealing portion. The top wall includes a first portion and a second portion disposed on both sides of the edge sealing portion in the thickness direction of the cell. A height from the first portion to a bottom wall of the main body is less than a height from the second portion to the bottom wall.