Battery Cell Pressure Relief Grooves to Reduce Vent Cracking
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional pressure relief apparatuses in battery cells often fail due to cracking when forming indented grooves, leading to poor long-term reliability, even when internal pressure is within normal ranges.
Innovation Solution
A pressure relief apparatus with multiple stages of indented grooves arranged sequentially from one surface to another, where each stage has reduced forming depth, and an opening area configured with indented grooves along its edge, allowing for reduced forming force and increased pressure relief area, thereby minimizing cracking risks and enhancing reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single deep indented groove is formed in the pressure relief portion, then the pressure relief function can be achieved, but the forming force is large which causes cracking and reduces reliability
Solution Approach 1:
The patent divides a single deep indented groove into multiple shallower indented grooves arranged in sequence from the first surface to the second surface. This segmentation reduces the forming depth and forming force required for each individual groove, thereby minimizing cracking risks and improving the long-term reliability of the pressure relief apparatus.
Solution Approach 2:
The patent transitions from a single-dimension deep groove approach to a multi-dimensional arrangement of multiple shallower grooves distributed through the thickness direction. This dimensional redistribution allows the total pressure relief function to be achieved while reducing the forming force at any single location.
2Reliability
If the forming depth of indented grooves is reduced to minimize cracking, then the risk of cracking decreases, but the pressure relief area may be insufficient
Solution Approach 1:
The patent compensates for the reduced area of individual shallower grooves by segmenting the total pressure relief function across multiple grooves. The cumulative pressure relief area of all grooves together is sufficient to achieve effective pressure relief, while each individual groove maintains a shallow depth to avoid cracking.
Solution Approach 2:
The patent combines multiple indented grooves to work together as a unified pressure relief system. The cumulative effect of multiple shallower grooves achieves the same or greater pressure relief capability as a single deep groove, while maintaining higher reliability through reduced forming forces.
3Reliability
If multiple stages of indented grooves are formed, then the forming force is reduced and reliability is improved, but the device complexity increases
Solution Approach 1:
The patent segments the pressure relief function into multiple stages corresponding to multiple indented grooves. While this increases the number of components, each groove follows the same structural pattern and works together in a systematic arrangement, making the complexity manageable and the manufacturing process standardized.
Data Source
AI summary
A pressure relief apparatus may include a pressure relief portion and a plurality of stages of indented grooves. The pressure relief portion may be provided with a first surface and a second surface arranged opposite to each other in a thickness direction thereof. The plurality of stages of indented grooves may be formed in the pressure relief portion in sequence in a direction from the first surface to the second surface, and among two adjacent stages of indented grooves, the stage of indented groove away from the first surface may be formed in a bottom surface of the stage of indented groove close to the first surface. The pressure relief portion may be provided with an opening area, and the indented grooves may be formed along an edge of the opening area.