Dissimilar-Metal Interconnection Joint Sealing Against Galvanic Corrosion
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Solution Overview
Problem
Galvanic corrosion occurs at the joint portions of device interconnection members made of dissimilar metals, leading to potential failure and reduced reliability in power storage devices.
Innovation Solution
A device interconnection member with a resin seal member hermetically sealing the joint portion of dissimilar metals, combined with nano-level roughened surfaces and plastic deformation for integral joining, preventing exposure to air and moisture, and eliminating the need for additional parts like rivets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If dissimilar metals are joined to connect electrode terminals, then electrical connection between different metal terminals is achieved, but galvanic corrosion occurs at the joint portion
Solution Approach 1:
The patent introduces a resin seal member as an intermediary substance that hermetically seals the joint portion between dissimilar metals. This resin layer acts as a barrier preventing direct contact between the dissimilar metals and the external environment, thereby eliminating the galvanic corrosion pathway while maintaining the electrical connection function through the conductive members
Solution Approach 2:
The resin seal member creates an inert, corrosion-free environment around the joint portion by hermetically sealing it. This sealed environment isolates the dissimilar metal interface from moisture and oxygen, preventing galvanic corrosion while allowing the electrical connection to function within the protected zone
2Ease of manufacture
If joint portion is exposed to air and moisture, then manufacturing and assembly is simplified, but corrosion occurs between dissimilar metals
Solution Approach 1:
The resin seal member functions as a flexible sealing film that hermetically covers the joint portion. This thin film barrier effectively prevents air and moisture from reaching the dissimilar metal interface, eliminating corrosion exposure while adding minimal complexity to the manufacturing process
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 effectively prevents corrosion and ensures reliable, durable connections between dissimilar metal terminals in power storage devices, enhancing the longevity and performance of the interconnection.
Implementation Method 1
when the first conductive member and the second conductive member, which constitute the device interconnection member as above, are made of dissimilar metals, galvanic corrosion can occur in a joint portion where a first joined portion of the first conductive member and the second joined portion of the second conductive member are joined to each other
Data Source
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AI summary
A device interconnection member (1) for connecting a first electrode terminal (120) made of first metal in one power storage device (100) and a second electrode terminal (130) made of second metal in another power storage device (100) includes a first conductive member (10) made of the first metal and to be connected to the first electrode terminal (120), a second conductive member (20) made of the second metal and to be connected to the second electrode terminal (130), a joint portion (5) where a first joined portion (14) of the first conductive member (10) and a second joined portion (24) of the second conductive member (20) are joined, and a resin seal member (30) hermetically sealing the joint portion (5).