Secondary Battery Explosion-Proof Sheet for Controlled Pressure Cracking
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Solution Overview
Problem
Existing explosion-proof sheets in secondary batteries deform frequently due to varying environmental pressures, leading to premature aging and damage, reducing the battery's service life.
Innovation Solution
The explosion-proof sheet features a main body portion with a strengthening region and a cracking portion, where the thickness and material density of the strengthening region are greater than the main body portion, allowing controlled cracking when pressure exceeds a threshold, while the main body portion maintains structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the explosion-proof sheet is made thinner to reduce weight and minimize volume, then the battery size is reduced, but the structural strength decreases causing frequent deformation and premature aging
Solution Approach 1:
The patent applies local quality by creating a strengthening region with increased thickness (h2) and material density in specific areas of the explosion-proof sheet, while other regions maintain thinner thickness (h1). This localized reinforcement provides the necessary structural strength to resist deformation under varying pressures without increasing the overall volume of the battery.
2Loss of substance
If the explosion-proof sheet is made thinner to reduce material usage, then manufacturing cost is reduced, but the sheet becomes prone to aging and damage under frequent deformations
Solution Approach 1:
The patent uses local quality by concentrating additional material (increased thickness h2 and density) only in the strengthening region where structural support is most needed, rather than uniformly thickening the entire sheet. This approach minimizes overall material usage while maximizing reliability in critical areas, extending the service life of the explosion-proof sheet.
3Ease of manufacture
If the explosion-proof sheet structure is simplified, then manufacturing is easier, but the sheet cannot withstand pressure threshold and cracks prematurely
Solution Approach 1:
The patent applies local quality by creating a strengthening region with modified thickness and density characteristics in specific areas of the explosion-proof sheet. This localized structural modification enhances pressure resistance in critical regions without significantly complicating the overall manufacturing process, as the strengthening region can be integrated into the existing sheet formation process.
4Strength
If the main body portion thickness is increased to prevent deformation, then structural strength is improved, but the sheet cannot crack timely when pressure exceeds threshold
Solution Approach 1:
The patent resolves this contradiction by applying local quality - the strengthening region provides enhanced structural support (thickness h2) to prevent premature deformation during normal operation, while the controlled cracking portion maintains the ability to crack timely when pressure exceeds the safety threshold. The strengthening is localized rather than universal, preserving the explosion-proof function.
Data Source
AI summary
An explosion-proof sheet of a secondary battery and a secondary battery are provided. The explosion-proof sheet has a main body portion, a fixing portion, and a cracking portion. The main body portion is opposite to the explosion-proof hole. A strengthening region is formed on the main body portion. The fixing portion is disposed around the main body portion, and the fixing portion is connected to a periphery of the explosion-proof hole. The cracking portion is located between the fixing portion and the main body portion and connected to the fixing portion and the main body portion.