Cylindrical Battery Can Structure for Stable External Lead Connection
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Solution Overview
Problem
Conventional cylindrical batteries have poor workability in connecting external leads due to the short length of the opening end portion of the outer can, leading to issues with gasket compression and terminal flatness, making stable connections difficult.
Innovation Solution
The cylindrical battery design features an outer can with a radially outward extending opening end portion and a projection that crimps the sealing assembly inward, providing a larger connection area and allowing for a polarity-different external terminal that is easily connected to external leads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the opening end portion of the outer can is made longer to improve workability in connecting external leads, then the connection workability is improved, but the opening end portion cannot uniformly compress the gasket, causing wrinkles and corrugations that result in poor flatness
Solution Approach 1:
The opening end portion is divided into two functional zones: a first length portion that compresses the gasket to seal the battery, and a second length portion that extends radially outward to provide a flat connection surface for external leads. This segmentation allows each portion to perform its specific function without interfering with the other, resolving the contradiction between connection workability and flatness.
2Manufacturing precision
If the opening end portion is made shorter to maintain good flatness and gasket compression, then the manufacturing precision is improved, but the workability in connecting external leads deteriorates
Solution Approach 1:
The opening end portion is segmented into a first length portion for gasket compression and sealing, and a second length portion for external lead connection. This allows the battery to maintain good flatness and sealing while providing sufficient length for easy external lead connection, resolving the contradiction between manufacturing precision and ease of operation.
3Reliability
If the opening end portion is extended radially outward to provide a larger connection area, then the connection stability is improved, but the device complexity increases
Solution Approach 1:
The opening end portion serves multiple functions: it seals the battery by compressing the gasket and provides a flat connection surface for external leads. By making the opening end portion itself multi-functional, the invention avoids adding separate components, thus improving connection stability without significantly increasing device complexity.
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 design enables a flat and sufficiently large external terminal connection area, improving the stability and workability of connecting external leads, reducing connection distance, and enhancing the formation of a battery module with higher density.
Implementation Method 1
The sealing assembly is fixed by being crimped radially inward by the projection via a gasket
Data Source
AI summary
The present invention provides a cylindrical battery in which the opening end of an outer can has a different polarity from a sealing body and is 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 protrusion formed by the side surface thereof protruding radially inward, and an opening end extends radially outward. The sealing body is fixed by crimping radially inward of the protrusion with a gasket interposed therebetween.