Pouch Battery Lead Layout for Compact Tab-to-Lead Sealing
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Solution Overview
Problem
Pouch-type rechargeable batteries face a challenge in increasing energy density due to the large space required for coupling between electrode leads and tabs, which does not contribute to the battery's capacity and hinders size optimization.
Innovation Solution
The battery design includes a pouch case with a unique arrangement of electrode leads and tabs, where the leads are extended in directions perpendicular to the electrode assembly, intersecting each other, and partially exposed outside the pouch case, with a circular rod-shaped lead and a sealing portion formed by bonding sheet members around the lead, reducing the space needed for coupling and improving energy density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If electrode leads are extended in the same direction as electrode tabs and drawn out of the pouch, then the coupling between electrode tabs and leads can be achieved, but the overall battery size increases due to the large space required for coupling, welding, and sealing
Solution Approach 1:
The electrode lead is extended in a direction intersecting with the electrode tab extension direction, rather than parallel to it. This dimensional change allows the lead to pass through the pouch case in a different spatial orientation, reducing the space required for coupling and welding operations while maintaining effective electrical connection between tabs and leads
2Quantity of substance
If the electrode lead is made thin and plate-shaped to reduce material usage, then material cost is reduced, but the space required for coupling and welding increases
Solution Approach 1:
By changing the extension direction of the electrode lead to intersect with the electrode tab direction, the coupling and welding operations can be performed in a more compact spatial arrangement. This dimensional reconfiguration reduces the overall space required for these operations while maintaining the thin, material-efficient design of the electrode lead
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
This design reduces the overall size of the battery while maintaining or enhancing energy density by minimizing the space consumed by the electrode lead and tab coupling, thereby optimizing the battery's capacity and size ratio.
Implementation Method 1
The first sheet member and the second sheet member are bonded to each other with the electrode lead therebetween to form a sealing portion sealing the inner space
Implementation Method 2
the leads are extended in directions perpendicular to the electrode assembly, intersecting each other, and partially exposed outside the pouch case
Data Source
AI summary
A rechargeable battery includes an electrode assembly including a plurality of electrodes stacked in a first direction, a pouch case defining an inner space in which the electrode assembly is accommodated, and including a first sheet member surrounding an upper portion of the electrode assembly and a second sheet member surrounding a lower portion of the electrode assembly, a plurality of electrode tabs drawn from the plurality of electrodes in a second direction, perpendicular to the first direction, and an electrode lead combined with the plurality of electrode tabs, extending in a direction, perpendicular to the first direction, and intersecting the second direction, and partially exposed to an exterior of the pouch case. The first sheet member and the second sheet member are bonded to each other with the electrode lead therebetween to form a sealing portion sealing the inner space.