Secondary Battery Plate Terminal Stepped Cap Structure
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Solution Overview
Problem
Conventional secondary batteries face challenges in increasing the height of the plate terminal connected to the cap plate without compromising the structural integrity and assembly process.
Innovation Solution
The secondary battery design incorporates a cap plate with a stepped portion that protrudes upward, featuring a recessed groove and protrusion parts to securely fix the plate terminal, allowing for a greater height and integrating the terminal with the cap plate, which can be formed using a mold with limited volume in a single unit terminal forming process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the plate terminal height is increased to improve electrical connection, then the terminal height is improved, but the structural stability deteriorates
Solution Approach 1:
The invention transitions from a simple planar terminal structure to a three-dimensional stepped structure with multiple levels. The stepped portion creates vertical dimensionality with different height levels, allowing the terminal to achieve greater height while maintaining structural stability through the distributed mass and geometric configuration of the steps.
Solution Approach 2:
The plate terminal is divided into multiple stepped portions at different height levels rather than being a single uniform structure. This segmentation allows each step to provide structural support while collectively achieving the desired terminal height, resolving the contradiction between height and stability.
2Length of moving object
If a separate plate terminal component is used to achieve desired height, then the terminal height is improved, but the device complexity increases
Solution Approach 1:
The invention merges the plate terminal with the cap plate into a single integrated component. The stepped portion is formed as part of the cap plate structure itself, eliminating the need for separate terminal components and reducing assembly complexity while achieving the desired terminal height.
Solution Approach 2:
The cap plate is given multiple functions: it serves as both the sealing cover and the terminal structure. The stepped portion of the cap plate directly functions as the plate terminal, combining what were previously separate components into one multi-functional element, thereby reducing device complexity.
Data Source
AI summary
The present invention comprises: an electrode assembly in which a separator is interposed in between a first electrode and a second electrode; a case for accommodating the electrode assembly; a cap plate for sealing an opening at the upper end of the case, wherein a first terminal electrically connected to the first electrode of the electrode assembly is integrally formed with the cap plate; at least one stepped portion protruding upward from the cap plate; and a plate terminal arranged on the exterior of the cap plate, wherein the plate terminal is provided with, on a bottom part thereof, a recessed groove having a size and a depth corresponding to the size and the height of the stepped portion. A secondary battery, according to one embodiment of the present invention, is provided with the protruding stepped portion on the cap plate so that the terminal can be fixed so as to prevent shifting to the left or to the right.