Anodized Aluminum Terminals in Electric Double Layer Devices
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Solution Overview
Problem
The existing electric double layer devices face issues with positive ion leakage, corrosion of aluminum terminals, and a need for improved workability and external appearance, which affect their lifespan and performance.
Innovation Solution
The electric double layer device incorporates a wound electrode unit with separated current collection sheets, terminals connected to these sheets, a case covered by a rubber cap with through holes, and a urethane potting unit that fills gaps between terminals and holes, featuring a urethane resin hardened in recesses defined by a volume protrusion on the rubber cap, and anodized aluminum terminals to prevent corrosion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If terminals are exposed through holes in the rubber cap, then electrical connection is enabled, but positive ions leak and corrode the aluminum terminals
Solution Approach 1:
The patent introduces an intermediary substance (potting compound or sealant) to fill the gap between the terminal and the through hole in the rubber cap. This mediator prevents positive ions from reaching the aluminum terminal while maintaining the electrical connection functionality, thus resolving the contradiction between ease of operation and reliability.
2Ease of manufacture
If the device structure is simplified for easier manufacturing, then workability improves, but external appearance and sealing effectiveness deteriorate
Solution Approach 1:
The patent applies preliminary action by pre-forming the rubber cap with integrated volume protrusions that define pot recesses before assembly. This allows the potting compound to be easily injected into predefined cavities, simplifying the manufacturing process while ensuring consistent sealing quality and neat external appearance without requiring complex post-assembly operations.
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 configuration effectively prevents positive ion leakage, increases the device's lifespan, enhances workability, and ensures stable terminal connection on a circuit board, while maintaining a neat appearance and improving adherence between urethane resin and pot recesses.
Implementation Method 1
a urethane resin filling and hardened in the first pot recess and the second pot recess
Implementation Method 2
anodized aluminum terminals to prevent corrosion
Implementation Method 3
an electrostatic layer is formed at the interface between an activated carbon electrode and an organic electrolyte, and the state of an electric double layer functions as a dielectric in order to accumulate electricity
Data Source
AI summary
Disclosed herein is an electric double layer device including a urethane potting unit (50) for filling the gap between a portion of a first terminal (21) that is exposed out of a rubber cap (40) and a first through hole (41) and the gap between a portion of a second terminal (22) that is exposed out of the rubber cap and a second through hole (42), wherein an aluminum terminal (A) constituting each of the first terminal (21) and the second terminal (22) is anodized such that an aluminum oxide film (Al) is formed on the aluminum terminal, whereby the lifespan of the electric double layer device is relatively increased.