Battery Terminal Sealing With Thin Rising Part
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Solution Overview
Problem
Existing battery designs face challenges in achieving high sealing performance, particularly with terminal structures on container members with small thicknesses, which are difficult to manufacture and maintain effective sealing due to limitations in deep drawing processes.
Innovation Solution
A battery design incorporating a terminal-connecting part with a thickness of 0.3 mm or less, featuring a through hole and a rising part with a diameter-reduction part, a hollow gasket shaft, and a terminal shaft with a diameter-reduction part, where the inclination angle of the rising part is greater than that of the terminal shaft, allowing for high sealing performance through pressure transmission and compression of the gasket.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If a terminal-connecting part with thickness of 0.3 mm or less is used to reduce battery weight and increase energy density, then the battery weight decreases and energy density increases, but the manufacturing difficulty increases and sealing performance becomes hard to achieve
Solution Approach 1:
The terminal-connecting part is divided into multiple functional segments: a base portion for embedding in the container member, a rising part extending upward, and torque resisting features. This segmentation allows each part to be optimized independently - the thin base portion (0.3mm or less) for weight reduction, while the rising part and embedded features provide the necessary structural support and sealing capability without requiring thick material throughout.
Solution Approach 2:
The base portion is pre-formed with embedded torque resisting features and gripping features before the final assembly. These features are created in advance during the forming process, allowing the thin terminal-connecting part to inherently possess the necessary structural integrity and sealing capability without requiring additional thickening or complex post-processing steps.
2Weight of moving object
If a terminal-connecting part with thickness of 0.3 mm or less is used, then the battery weight decreases and energy density increases, but the sealing performance deteriorates
Solution Approach 1:
The sealing function is separated from the structural support function. The thin base portion (0.3mm or less) provides structural support through its embedded torque resisting features, while the rising part extends upward to create a sealing interface with the battery part. This segmentation allows the thin section to maintain both weight advantage and sealing capability.
Solution Approach 2:
The sealing capability is achieved by extending in the vertical dimension rather than relying on thickness in the horizontal dimension. The rising part extends upward from the thin base portion, creating a sealing interface that compensates for the reduced thickness. This dimensional transition allows thin material to achieve sealing performance traditionally requiring greater thickness.
3Reliability
If deep drawing process is used to form the terminal structure, then the sealing performance can be improved, but the manufacturing complexity and difficulty increase for thin materials
Solution Approach 1:
The torque resisting features and gripping features are preliminarily formed in the base portion during the initial shaping process, before the deep drawing operation. This preliminary formation of structural features simplifies the subsequent deep drawing process by providing a pre-prepared geometry that requires less complex forming operations while still achieving the necessary sealing performance.
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
The design achieves high tightness of contact between the terminal and gasket, and between the rising part and gasket, effectively preventing moisture infiltration and electrolyte leakage, thus maintaining battery performance and integrity.
Implementation Method 1
The inclination angle of the diameter-reduction part of the rising part to the axial direction of the terminal shaft is larger than the inclination angle of the diameter-reduction part of the terminal shaft to the axial direction of the terminal shaft
Implementation Method 2
The restraining member restrains at least a part of the diameter-reduction part of the terminal shaft via the diameter-reduction part of the rising part and the shaft of the gasket
Implementation Method 3
effectively preventing moisture infiltration and electrolyte leakage, thus maintaining battery performance and integrity
Data Source
Figure 1
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Figure 3~4
AI summary
A battery disclosed herein includes a container member housing an electrode body and a lead, a gasket, an external terminal, and a restraining member. The container member includes a terminal-connecting part having a thickness of 0.3 mm or less. The terminal-connecting part includes a through hole including a rising part. The gasket includes a hollow shaft inserted into the rising part. The external terminal includes a terminal shaft. The terminal shaft includes a diameter-reduction part. The restraining member restrains at least a part of the diameter-reduction part of the terminal shaft via the diameter-reduction part of the rising part and the shaft of the gasket. The inclination angle of the rising part is larger than the inclination angle of the terminal shaft.