Cylindrical Battery Crimp Structure for Flat Top-Side Wiring
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Solution Overview
Problem
Existing battery designs require a vertical space for wiring due to the irregular shape of the crimped portion, which limits the connectivity options and increases the complexity of the wiring process.
Innovation Solution
The battery design incorporates a tongue portion at the opening edge of the battery can, which extends inward in a radial direction to cover the upper surface of the gasket, allowing for a flatter and more even crimped portion that can function as an external terminal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the opening edge is crimped in an inverted L shape to form a ring-shaped extending portion, then the opening sealing member can be mounted and sealed, but the inner circumferential side develops irregularities and wrinkles due to the shorter inner circumferential length
Solution Approach 1:
The opening edge is divided into two distinct portions: a base portion that forms the ring-shaped extending structure, and a tongue portion that extends radially inward to cover the gasket. This segmentation allows the base portion to provide sealing functionality while the tongue portion maintains surface flatness and prevents wrinkles.
Solution Approach 2:
Different regions of the opening edge are given different structural characteristics. The base portion is designed to extend radially outward for sealing, while the tongue portion extends radially inward to lie flat over the gasket. This local differentiation resolves the contradiction between sealing requirements and surface flatness.
2Reliability
If lead wires are connected to external terminals with one led out from lower surface and other from upper surface, then electrical connection is achieved, but vertical wiring space is required increasing device complexity
Solution Approach 1:
Both lead wire connections are merged to occur from the upper surface of the battery. The tongue portion of the opening edge serves as a connection point for one lead wire, while the opening sealing plate serves as the connection point for the other lead wire, eliminating the need for lower surface connection and reducing vertical wiring space requirements.
3Reliability
If the opening edge is crimped to form an extending portion for mounting the opening sealing member, then sealing is achieved, but the irregular ring shape causes wrinkles and reduces manufacturing precision
Solution Approach 1:
The opening edge is segmented into a base portion for forming the ring-shaped extending structure and a tongue portion that extends radially inward. This segmentation enables the base portion to provide the necessary sealing structure while the tongue portion maintains a flat, wrinkle-free surface that improves manufacturing precision.
Solution Approach 2:
The tongue portion is specifically designed with different geometric properties compared to the base portion. It extends radially inward to cover the gasket surface, creating a locally optimized structure that ensures both sealing reliability and surface flatness for precise manufacturing.
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 enables both electrodes to be connected from the upper side of the battery, reducing the need for vertical wiring space and simplifying the connection process while minimizing the occurrence of wrinkles in the crimped portion.
Implementation Method 1
a gasket interposed between the terminal portion and the opening edge portion in a compressed state
Data Source
AI summary
A battery includes a battery can which includes a cylindrical portion having an opening edge portion at one end portion and a bottom portion closing the other end portion of the cylindrical portion, an electrode assembly which is housed in the cylindrical portion, and an opening sealing body which seals an opening formed in the opening edge portion. The opening sealing body includes a terminal portion and a gasket interposed in a compressed state between the terminal portion and the opening edge portion. The opening edge portion includes at least a base portion extending in an axial direction of the cylindrical portion and a tongue portion protruding from the base portion, and the tongue portion extends inward in a radial direction of the cylindrical portion so as to cover an upper surface of the gasket.