Battery Sealing Plate Vent Structure for Stable Gas Release
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Solution Overview
Problem
Conventional gas discharge valves in secondary batteries face issues with high processing loads and work hardening during molding, leading to reduced mass production stability and limited design freedom due to the formation of thin-film portions that are difficult to break at a predetermined pressure.
Innovation Solution
A sealing plate with a gas discharge valve design featuring a flat base portion and a protruding portion, surrounded by an annular thin-walled portion, where the thin-walled portion is limited to the periphery of the protruding portion, reducing the amount of metal deformation during molding and work hardening, and incorporating specific groove and recess configurations to enhance operational stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a thin-film portion is formed by plastically deforming a large amount of metal in the conventional gas discharge valve, then the valve structure is achieved, but the processing load is very large and mass production stability is lowered
Solution Approach 1:
The invention divides the deformed metal into two distinct regions: a thin-walled portion with small thickness and a protruding portion with large thickness. This segmentation allows the thin-walled portion to break at predetermined pressure while the protruding portion absorbs and stores the deformed metal, reducing overall processing load and improving mass production stability.
Solution Approach 2:
The invention applies different thickness characteristics to different regions of the gas discharge valve. The thin-walled portion has small thickness to facilitate breaking at predetermined pressure, while the protruding portion has large thickness to store deformed metal and reduce processing load. This local differentiation resolves the contradiction between operational requirements and manufacturing stability.
2Reliability
If a thin-film portion is formed by plastically deforming a large amount of metal, then the valve structure is achieved, but work hardening occurs and the thin-film portion may not break at predetermined internal pressure
Solution Approach 1:
The invention creates a local thin-walled portion with controlled, small thickness that experiences minimal work hardening during molding. This localized approach ensures the thin-walled portion can break at predetermined pressure, while the thicker protruding portion handles the bulk of the deformation and work hardening, resolving the contradiction between operational reliability and material strength.
Solution Approach 2:
By segmenting the valve structure into thin-walled and protruding portions, the invention isolates the breaking function to the thin-walled portion. This segmentation ensures that work hardening in the protruding portion does not prevent the thin-walled portion from breaking at the desired pressure, thereby maintaining operational stability.
3Adaptability or versatility
If the conventional gas discharge valve design is used, then a complete valve structure is achieved, but the degree of freedom of design is very limited due to consideration of work hardening
Solution Approach 1:
The invention enables independent design of the thin-walled portion's thickness and geometry without being constrained by work hardening considerations. Since the thin-walled portion is separated from the protruding portion, designers can freely adjust its dimensions to achieve desired breaking pressure and operational characteristics, significantly increasing design freedom.
Solution Approach 2:
By separating the valve into thin-walled and protruding portions, the invention allows independent optimization of each region. The thin-walled portion can be designed purely for breaking at predetermined pressure, while the protruding portion handles structural requirements, thereby expanding the overall degree of freedom in valve design.
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 significantly reduces processing loads, improves mass production stability, and enhances the freedom of design by ensuring the thin-walled portion breaks at a desired pressure, thereby improving the operational stability of the gas discharge valve.
Implementation Method 1
a thin-walled portion (16) having a thickness smaller than the thickness of the protruding portion (14) is provided around the protruding portion (14)... ensuring the thin-walled portion breaks at a desired pressure
Implementation Method 2
a large amount of metal is plastically deformed and the processing load is very large... the formation region of the thin-walled portion where a large amount of metal needs to be plastically deformed
Implementation Method 3
since the thin-film portion formed by plastically deforming a large amount of metal is subjected to a large work hardening
Data Source
AI summary
According to the present disclosure, there is provided a sealing plate equipped with a gas discharge valve that reduces processing load and work hardening during molding. A gas discharge valve of a sealing plate 1 disclosed herein has a flat plate-shaped base portion and a protruding portion protruding from a first surface of the base portion in a first direction, an annular thin-walled portion having a thickness smaller than the thickness of the protruding portion is provided around the protruding portion, and a first surface of the thin-walled portion is substantially on the same surface as the first surface of the base portion. In the gas discharge valve having the above configuration, the total amount of metal that is plastically deformed is reduced by limiting the formation region of the thin-walled portion to the periphery of the protruding portion.