Cylindrical Battery Opening-End Structure for Stable Lead Joining
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Solution Overview
Problem
Conventional cylindrical batteries have a short opening end portion, making it difficult to connect external leads effectively, leading to poor workability and instability due to wrinkles and corrugations when attempting to extend the length for better connection.
Innovation Solution
The cylindrical battery design features an opening end portion extending radially outward with a pressing member that functions as an external terminal with a different polarity, allowing for easy connection of external leads, improving flatness and area for stable terminal formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the opening end portion of the outer can is extended to improve workability for connecting external leads, then the connection area is increased, but wrinkles and corrugations occur resulting in poor flatness
Solution Approach 1:
The opening end portion is divided into a first opening end portion (integrated with the outer can) and a second opening end portion (pressing member with different material properties). This segmentation allows each part to have optimized characteristics: the first portion maintains structural integrity while the second portion provides enhanced flatness and connection area without causing wrinkles.
Solution Approach 2:
The pressing member is formed from a material with different properties than the outer can material. This composite structure allows the pressing member to provide superior flatness and dimensional stability for lead connection, while the outer can maintains its structural function. The material difference prevents the wrinkling issue that occurs when simply extending the original can material.
2Area of stationary object
If the opening end portion is extended radially outward to provide larger connection area, then external lead connection is facilitated, but the area for uniform compression of the gasket is reduced
Solution Approach 1:
The functional areas are segmented: the first opening end portion (shorter, integrated with outer can) provides the gasket compression area, while the second opening end portion (extended, pressing member) provides the external lead connection area. This segmentation ensures both functions have sufficient area without competing for the same space.
Solution Approach 2:
The pressing member acts as an intermediary between the outer can and the external lead. It transfers the compression force uniformly to the gasket through its first opening end portion, while its extended second opening end portion provides a stable, wrinkle-free surface for lead connection, mediating between the structural can and the connection requirement.
3Manufacturing precision
If the opening end portion is made shorter to maintain good flatness, then gasket compression is uniform, but workability for connecting external leads deteriorates
Solution Approach 1:
The opening end portion is segmented into two functional zones: a first zone integrated with the outer can that maintains short length for good flatness and gasket compression, and a second zone in the form of a pressing member that extends radially to provide sufficient connection area for external leads.
Solution Approach 2:
The pressing member serves multiple functions: it provides the extended connection area for external leads, maintains uniform gasket compression through its first opening end portion, and ensures stable electrical connection. This multi-functionality resolves the contradiction by making a single component that addresses both flatness and workability requirements.
Data Source
AI summary
The present invention provides a cylindrical battery in which the opening end of an outer can has an external terminal of a different polarity from a sealing body and easily connectable to an external lead. A cylindrical battery that is one embodiment described in the present disclosure comprises: an electrode body that includes a positive electrode and a negative electrode; a bottomed cylindrical outer can that houses the electrode body and is connected to one of the positive electrode and the negative electrode; and a sealing body that is connected to the other of the positive electrode and the negative electrode. The outer can has a groove, and an opening end that extends radially outward. The sealing body is fixed by crimping between the groove and a pressing member with a gasket interposed therebetween, said pressing member being joined to the opening end.