Resin Collector Tab Stacking for Through-Plane Battery Conduction
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Solution Overview
Problem
Conventional pouch-type battery cells with resin collectors experience poor electron conduction in the through-plane direction due to non-conductive polymer layers, leading to resistance differences between electrodes and poor battery performance during high-rate charging and discharging.
Innovation Solution
An electrode assembly with A-type and B-type electrode tabs of different shapes alternately stacked and partially overlapped, forming a conduction structure with metal layers on polymer layers, facilitating electron conduction in the electrode stacking direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a resin collector with metal layers deposited on polymer layers is used to increase energy density and improve stability, then energy density and stability are improved, but electron conduction in the through-plane direction deteriorates due to non-conductive polymer layers
Solution Approach 1:
The patent uses a composite structure consisting of a polymer layer with metal layers deposited on both surfaces. The polymer layer provides stability and lightweight properties, while the metal layers provide electrical conductivity. This composite material approach resolves the contradiction by combining materials with complementary properties to achieve both stability and conduction.
Solution Approach 2:
The patent addresses the through-plane conduction issue by creating a multi-layer structure where metal layers are positioned on both surfaces of the polymer layer. This dimensional arrangement allows electron conduction paths to bypass the non-conductive polymer interior by traveling through the conductive metal layers, effectively solving the conduction problem in the through-plane direction.
2Ease of manufacture
If electrode tabs are simply stacked and bonded in a conventional manner, then assembly simplicity is maintained, but resistance difference between electrodes increases leading to poor battery performance
Solution Approach 1:
The patent segments the electrode tabs into multiple functional layers: polymer layers for structural support, metal layers for electrical conduction, and active material layers for electrochemical function. This segmentation allows each layer to perform its specific function optimally, with metal layers strategically positioned to ensure uniform electron conduction across all electrodes, thereby improving battery performance while maintaining manufacturability.
Solution Approach 2:
The patent applies local quality by positioning metal layers specifically at critical conduction points and interfaces where electrical connectivity is most needed. The metal layers are deposited on the polymer layers at electrode tab locations to create localized high-conductivity zones, ensuring uniform resistance across all electrodes without requiring complete metalization of the entire structure.
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 solution enhances electron conduction in the electrode assembly, minimizing resistance differences and improving battery performance and stability.
Implementation Method 1
conduction of electrons is facilitated by the metal layers 10 of the resin collector in the planar direction of the electrode, but since the polymer layers 20 of the resin collector is non-conductive, conduction of electrons is inevitably poor in the direction of the electrode stacking through-plane
Data Source
AI summary
The present disclosure relates to an electrode assembly having an electrode tab bonding structure and a secondary battery including the same, and more particularly, to an electrode assembly including a resin collector having metal layers deposited on a polymer layer, in which electrode tabs of different shapes are alternately stacked so that a conduction structure is formed, and in which conduction of electrons is facilitated in the direction of the electrode stacking even in the presence of the polymer layer, and a secondary battery including the electrode assembly.