Multilayer Lead Tab Structure for Corrosion-Resistant Pouch Batteries
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Solution Overview
Problem
Pouch-type batteries face issues with electrolyte leakage and corrosion of lead tabs due to inadequate adhesive strength and corrosion resistance, leading to swelling and other problems.
Innovation Solution
A lead tab structure comprising a metal with multiple layers, including a first metal layer, a second metal layer plated with electroplating, a third metal layer plated with electroless plating, and an organic layer, which enhances adhesive strength and corrosion resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a pouch-type battery has a large capacity, then the battery pack size becomes large, but this makes it difficult to fit into devices with limited installation spaces
Solution Approach 1:
The patent implements nesting by placing the first pouch-type battery inside the second pouch-type battery. The inner battery is positioned within the outer battery's housing, with the terminal assembly extending through the outer battery's terminal opening. This nested configuration allows two batteries to occupy overlapping spatial volumes, effectively reducing the overall battery pack size while maintaining the total capacity of both batteries.
2Volume of moving object
If the battery pack size is reduced to fit limited spaces, then installation space requirements are met, but heat dissipation becomes insufficient
Solution Approach 1:
The patent utilizes three-dimensional spatial arrangement by nesting batteries in a radial configuration. The terminal assembly extends axially through the outer battery, creating a vertical heat dissipation path. The heat generating portions of both batteries are positioned to allow thermal energy to dissipate in multiple directions (radially and axially), effectively managing heat in the reduced volume through dimensional optimization.
3Volume of moving object
If the battery pack size is reduced, then device integration is improved, but manufacturing complexity increases
Solution Approach 1:
The patent merges multiple functional components into integrated assemblies. The terminal assembly combines the electrical connections of both batteries with the structural support elements into a single integrated component. The housing of the outer battery serves dual purposes as both the outer shell and the mounting structure for the inner battery. This merging reduces the number of separate manufacturing steps and assembly operations required.
Data Source
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AI summary
The present invention relates to a lead tab and a pouch type battery including the same. The lead tab according to an embodiment of the present disclosure includes a metal and a film disposed on at least one surface of the metal, in which the metal includes a first metal layer, a second metal layer disposed on the first metal layer, a third metal layer disposed on the second metal layer, and an organic layer disposed on the third metal layer; and at least a portion of the third metal layer is plated on the second metal layer by electroless plating. Accordingly, an adhesive strength of the film on the metal may be improved, and corrosion resistance to the electrode in the pouch type battery may be improved.