Battery Pressure Relief Part With Nested Score Grooves
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Solution Overview
Problem
Conventional pressure relief apparatuses in batteries can fail prematurely due to cracks caused by deep score grooves, leading to unintended pressure relief even within normal internal pressure ranges, compromising long-term reliability.
Innovation Solution
A pressure relief apparatus with multi-stage score grooves arranged from the first surface to the second surface, where each stage's groove is formed with reduced depth to minimize forming force and risk of cracking, and the structure includes intersecting groove segments to concentrate stress and facilitate rapid pressure relief.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If deep score grooves are used in the pressure relief apparatus, then the pressure relief function is enhanced, but the risk of cracks and long-term reliability deteriorates
Solution Approach 1:
The single deep score groove is segmented into multiple shallow score grooves arranged in stages. Each stage contains one or more score grooves with reduced depth compared to conventional single deep grooves. This segmentation achieves the pressure relief function through cumulative effect of multiple grooves while reducing the forming force on each individual groove, thereby minimizing crack risk and improving long-term reliability.
2Reliability
If multi-stage score grooves are arranged sequentially from first surface to second surface, then the forming force and crack risk are reduced, but the device complexity increases
Solution Approach 1:
The multi-stage score grooves are arranged in a nested configuration where subsequent stages are positioned on the bottom surface of previous stages. This nesting approach systematically organizes multiple grooves within the thickness direction of the pressure relief part, achieving reduced forming force per groove while maintaining a compact and orderly structure that minimizes unnecessary complexity.
Solution Approach 2:
Instead of increasing groove depth in a single dimension, the solution transitions to arranging multiple grooves in the thickness direction (another dimension). This dimensional change allows the pressure relief function to be achieved through multiple shallow grooves rather than one deep groove, reducing crack risk while organizing the structure systematically along the thickness axis.
3Speed
If multiple groove segments intersect to concentrate stress, then the pressure relief speed is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The score grooves are designed with varying local characteristics: earlier stages have grooves with larger spacing to accommodate forming processes, while later stages have grooves with smaller spacing to enhance stress concentration and accelerate pressure relief. This local quality variation optimizes both the pressure relief speed and the manufacturability at different positions within the multi-stage structure.
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 solution enhances the long-term reliability and impact resistance of the pressure relief apparatus by reducing the risk of cracks and improving the pressure relief rate, ensuring reliable operation even under external force impacts.
Implementation Method 1
the stress of the pressure relief part at the position of intersection of the third groove segment with the fourth groove segment is more concentrated, and it is easier to break
Data Source
AI summary
A pressure relief apparatus includes a pressure relief part having a first surface and a second surface opposite to each other in a thickness direction of the pressure relief part, and a plurality of stages of score grooves sequentially arranged on the pressure relief part in a direction from the first surface to the second surface. Of two adjacent stages of score grooves in the thickness direction, one stage of score groove that is farther from the first surface is arranged on a bottom surface of another stage of score groove that is closer to the first surface.