Battery Cell Housing Vent Groove Layout to Prevent Premature Cracking
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Solution Overview
Problem
The premature cracking of pressure relief grooves in battery cell housings due to creeping of weak portions reduces the service life of battery cells.
Innovation Solution
The housing design features at least three edge portions intersecting at a vertex with an indentation groove that intersects with at least two of these edge portions, enhancing deformation resistance and pressure relief efficiency by ensuring equal difficulty in bursting for each groove segment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the indentation groove is provided away from edge portions to facilitate pressure relief, then pressure relief efficiency is improved, but the housing structure becomes weaker and more prone to abnormal cracking
Solution Approach 1:
The patent positions the indentation groove asymmetrically close to the edge portions of the housing rather than centrally, utilizing the inherent structural strength of edge regions to prevent abnormal cracking while maintaining pressure relief functionality
Solution Approach 2:
The indentation groove is pre-positioned in a location that anticipates potential cracking issues, placing it near edge portions before operation to preemptively prevent abnormal cracking during pressure relief operations
2Strength
If the indentation groove is provided close to edge portions to prevent abnormal cracking, then housing strength is improved, but pressure relief efficiency may be reduced
Solution Approach 1:
The patent uses multiple groove segments (first, second, and third groove segments) distributed across different housing surfaces, providing excessive pressure relief pathways that ensure efficient pressure relief while maintaining the beneficial positioning near edge portions
3Speed
If the groove segments have unequal bursting difficulty, then pressure relief occurs more quickly, but the housing may crack abnormally due to stress concentration
Solution Approach 1:
The patent designs each groove segment with locally optimized characteristics, positioning them near edge portions where the housing has different structural properties, creating equal bursting difficulty across segments through localized structural adjustments
Solution Approach 2:
The patent ensures all groove segments have equal bursting difficulty by symmetric positioning and uniform design, creating homogeneous cracking behavior across different housing regions to prevent stress concentration and abnormal cracking
Data Source
AI summary
This application discloses a housing, a battery cell, a battery, and an electric device, and pertains to the field of battery technologies. The housing has at least three edge portions intersecting at a same vertex. An indentation groove is provided on the housing, and the indentation groove intersects with at least two of the edge portions. Because the region near the edge portion of the housing has strong deformation resistance, the probability of abnormal cracking of the indentation groove due to creeping of the region in which the indentation groove is provided on the housing is reduced, thereby prolonging service life of the battery cell.