Pouch Battery Cell Corner Lead Layout for Fast Charging
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Solution Overview
Problem
Pouch-type battery cells have a high ratio of non-electrode plate area, leading to capacity loss and limitations in increasing energy density per unit volume and responding to rapid charging due to restricted electrode lead height and space requirements for bus bar connections.
Innovation Solution
The design includes an electrode assembly with chamfered corners and inclined portions, allowing electrode leads to be exposed through a corner sealing portion, increasing the width of the electrode leads and optimizing their connection to bus bars, which reduces capacity loss and enhances rapid charging capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electrode leads are disposed on both sides of the pouch in the longitudinal direction, then electrical connection is achieved, but the ratio of non-electrode plate area increases leading to capacity loss
Solution Approach 1:
The patent changes the symmetric disposition of electrode leads (one on each side) to an asymmetric configuration where both electrode leads are disposed on one side of the pouch. This asymmetric arrangement reduces the non-electrode plate area ratio while maintaining electrical connection functionality.
Solution Approach 2:
The patent repositions electrode leads from the longitudinal direction (both sides) to the width direction (one side), utilizing a different spatial dimension. This dimensional change allows electrode leads to be exposed through sealing portions in the width direction, reducing capacity loss.
2Power
If height of electrode lead is increased for rapid charging, then resistance is lowered, but space requirements conflict with battery cell structure
Solution Approach 1:
The patent increases electrode lead height in the width direction rather than the longitudinal direction, utilizing an alternative spatial dimension. This allows the electrode lead height to exceed the battery cell height without conflicting with the longitudinal structure, enabling rapid charging while maintaining compact cell volume.
3Productivity
If electrode leads are exposed through corner sealing portion, then width of electrode leads increases improving current flow, but sealing structure becomes more complex
Solution Approach 1:
The patent employs asymmetric sealing where only one corner sealing portion (first corner) is configured to expose electrode leads, while other corner sealing portions maintain standard sealing. This selective asymmetric design increases electrode lead width for better current flow while minimizing additional sealing complexity.
Data Source
AI summary
A pouch-type battery cell includes an electrode assembly formed by stacking a plurality of electrode plates, a pouch having an electrode accommodating portion accommodating the electrode assembly therein and a sealing portion sealing at least a portion of a circumference of the electrode accommodating portion, and electrode leads electrically connected to the electrode assembly and exposed to an outside of the pouch through the sealing portion. The electrode leads are exposed to the outside of the pouch through a first sealing portion formed at a corner of the pouch among the sealing portion.