Asymmetric Inversion Plate for Secondary Battery Shock Resistance
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Solution Overview
Problem
Secondary batteries face operational failures due to external vibrations or shocks, which can cause internal damage and reliability issues, as existing designs lack effective mechanisms to dampen these external factors.
Innovation Solution
A secondary battery design featuring an inversion plate with an asymmetrical elliptical shape that increases contact area with the terminal plate, allowing a short-circuit current to flow for a longer period until a fuse operation is performed, thereby enhancing operational reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional membrane design is used, then the structure is simple, but the membrane cannot maintain short-circuit state long enough for reliable fuse operation under vibration or shock
Solution Approach 1:
The inversion plate is designed with an asymmetrical planar shape where the first dimension (length) is greater than the second dimension (width). This asymmetry causes the plate to make contact with the terminal plate along a line extended in the lengthwise direction during inversion, maximizing the contact area and ensuring the short-circuit current flows for a sufficient duration to trigger reliable fuse operation
Solution Approach 2:
The invention transitions from point or line contact to area contact by designing the inversion plate with specific dimensional proportions. The plate's first dimension is made larger than its second dimension, causing contact to occur along a line extended in the lengthwise direction, thereby increasing the contact area and duration of short-circuit current flow
2Area of stationary object
If the inversion plate has a symmetrical shape, then manufacturing is easier, but the contact area with terminal plate during inversion is insufficient
Solution Approach 1:
The inversion plate is designed with an asymmetrical planar shape where the first dimension (length) is greater than the second dimension (width). This asymmetry causes the plate to make contact with the terminal plate along a line extended in the lengthwise direction during inversion, maximizing the contact area and ensuring the short-circuit current flows for a sufficient duration to trigger reliable fuse operation
Solution Approach 2:
The invention specifies particular parameter ranges for the inversion plate, including the ratio of width to length being 1:1.5 to 1:2.5, and the protrusion part having specific dimensional relationships (first dimension 1:1.5 to 1:2.5 times the second dimension). These parameter changes optimize the contact area while maintaining manufacturability
3Duration of action of moving object
If the contact area between inversion plate and terminal plate is small, then the inversion operation is quick, but the short-circuit current flows for insufficient time
Solution Approach 1:
The inversion plate is designed with an asymmetrical planar shape where the first dimension (length) is greater than the second dimension (width). This asymmetry causes the plate to make contact with the terminal plate along a line extended in the lengthwise direction during inversion, maximizing the contact area and ensuring the short-circuit current flows for a sufficient duration to trigger reliable fuse operation
Solution Approach 2:
The protrusion part is designed with specific dimensional parameters (first dimension being 1:1.5 to 1:2.5 times the second dimension) to ensure that during inversion, the plate makes contact along an optimized line. This preliminary design of the contact geometry ensures the short-circuit current flows for the required duration without excessive inversion time
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 secures operational reliability by maintaining a short-circuited state until a preset current level is reached, ensuring the short-circuit current flows for a longer duration and facilitating a successful fuse operation, thus improving the battery's resistance to external shocks and vibrations.
Implementation Method 1
allowing a short-circuit current derived from an inversion operation of the inversion plate to flow for longer than a constant period of time until a fuse operation is performed
Data Source
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AI summary
Disclosed is a secondary battery (100), which can improve the reliability by allowing a membrane to be maintained at a short-circuited state until a preset current level is reached. In one embodiment, the secondary battery (100) includes an electrode assembly (110) including a first electrode plate and a second electrode plate, a case (140) accommodating the electrode assembly (110), a cap plate (151) coupled to an opening of the case (140) and electrically connected to the first electrode plate, an electrode terminal including a terminal plate (156) passing through the cap plate (151) and electrically connected to the second electrode plate, and an asymmetrically shaped inversion plate (159) coupled to the cap plate (151) and performing an inversion operation when an internal pressure of the case (140) exceeds a reference pressure.