Battery Safety Valve Sheet Structure for Directed Pressure Relief
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Solution Overview
Problem
Existing pressure relief structures in lithium batteries do not specify the opening direction of the security apparatus, leading to potential damage to nearby components during the rupture of the valve sheet.
Innovation Solution
A security apparatus with score-lines of varying thicknesses, where the second score-line is thicker than the first, allowing the valve sheet to open orientationally without departing from the outer frame, preventing damage to other components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the security apparatus uses a uniform thickness design for score-lines, then the manufacturing process is simple, but the valve sheet may rupture in uncontrolled directions causing damage to nearby components
Solution Approach 1:
The patent applies local quality by varying the thickness of different score-lines within the same security apparatus. The first score-line has a first thickness while the second score-line has a second thickness greater than the first thickness. This localized differentiation in thickness enables controlled rupture direction while maintaining overall structural integrity, resolving the contradiction between reliability and device complexity.
2Object-affected harmful factors
If the security apparatus allows free opening of the valve sheet, then the pressure relief function is achieved, but the ruptured valve sheet may cause damage to other nearby components
Solution Approach 1:
By implementing different thicknesses at different locations (first thickness at the first score-line, second thickness at the second score-line), the patent directs the rupture to occur in a controlled manner that prevents the valve sheet from damaging nearby components, while the thickness variation design remains relatively simple.
3Reliability
If the second score-line has the same thickness as the first score-line, then the structure is simpler, but the valve sheet cannot maintain connection with the outer frame during opening
Solution Approach 1:
The patent makes the second score-line thicker than the first score-line, creating a localized strength difference that ensures the valve sheet maintains connection with the outer frame at the second score-line during the opening process, while keeping the overall design simple with only two distinct thickness regions.
Data Source
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AI summary
Provided are a security apparatus, a manufacturing method thereof, and a battery. A first score-line (1) and a second score-line (2) are disposed on the security apparatus. The first score-line (1) and the second score-line (2) are connected to form a closed line. The first score-line (1) and the second score-line (2) divide the security apparatus into an outer frame (100) and a valve sheet (200). A thickness of the security apparatus at the second score-line (2) is greater than a thickness of the security apparatus at the first score-line (1). The valve sheet (200) is capable of being separated from the outer frame (100) along the first score-line (1) and being kept in connection with the outer frame (100) at the second score-line (2).