Battery Current Collector Rivet Joint With Tapered Boundary Alignment
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Solution Overview
Problem
Conventional battery manufacturing methods face challenges in reliably connecting constituent members due to unclear boundary identification between members, leading to unstable connections.
Innovation Solution
Incorporating a plate-shaped portion with a tapered surface on either the first or second current collecting member, allowing for precise identification and joining of the boundary between members through image capture, ensuring accurate alignment and stable electrical connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional joining methods are used without boundary identification features, then the manufacturing process is simple, but the joining precision and connection reliability are poor
Solution Approach 1:
The patent applies a tapered surface treatment to the peripheral end portion of the contact part, creating a visual boundary feature that appears as a distinct line in captured images. This tapered surface acts as a visual marker that enables precise identification of the joining target site through image processing, thereby improving joining precision without significantly complicating the manufacturing process.
Solution Approach 2:
The tapered surface is formed in advance on the peripheral end portion of the contact part before the joining process. This preliminary preparation of the boundary identification feature allows the image processing system to accurately locate the joining position, ensuring precise alignment between the contact part and the plate-shaped portion before actual joining occurs.
2Reliability
If the peripheral end portion is completely joined to the plate-shaped portion, then the electrical connection is maximized, but the boundary becomes invisible in images making precise alignment difficult
Solution Approach 1:
The patent applies different properties to different parts of the contact part: the peripheral end portion has a tapered surface that creates a visible gap for boundary identification, while the main body maintains full contact with the plate-shaped portion for reliable electrical connection. This local differentiation allows both functions to coexist - the tapered region provides visual feedback for alignment while the joined region ensures electrical connectivity.
Solution Approach 2:
The tapered surface creates an optical contrast (visual gap) that makes the boundary visible in images. This optical feature allows the image processing system to detect the boundary position with high precision, enabling accurate alignment while the actual joining process ensures reliable electrical connection between the contact part and plate-shaped portion.
Data Source
AI summary
A battery includes a current collecting member connected to a power generating element housed in an outer casing with a lid, and a rivet placed outside the outer casing. The current collecting member includes a plate-shaped portion placed along the lid. The rivet includes a through part extending through the lid, and a contact part contacting a first surface of the plate-shaped portion. A part of a peripheral end portion of the contact part is joined to the first surface. An edge portion of a non-joined portion of the peripheral end portion, facing the first surface, includes a tapered surface generating a gap smaller at a position closer to the through part. The tapered surface has a maximum size of 0.1 mm or more in a direction from the peripheral end portion to the through part and 0.03 mm or more in a thickness direction of the peripheral end portion.