Battery Cell Vent Groove Structure for Shell Flatness Control
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Solution Overview
Problem
Existing battery cells face issues with inconsistent overall dimensions due to poor consistency in the outer shells after fabricating pressure relief structures, affecting production quality, reliability, and service life.
Innovation Solution
A battery cell design featuring a shell with a first wall and a second wall connected by a first groove that can rupture for pressure relief, accompanied by a second groove to absorb excess material during fabrication and deformations, improving size consistency and planeness, and a multi-stage groove structure for enhanced energy absorption and deformation protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pressure relief structure is integrated on the battery cell shell, then the safety of the battery cell is improved, but the consistency of overall dimensions of the outer shell deteriorates
Solution Approach 1:
The first groove is divided into multiple groove segments (first groove segment, second groove segment, third groove segment) that are distributed at different positions on the first wall. This segmentation allows the pressure relief function to be distributed across multiple locations, reducing the impact of material extrusion at any single location on the overall dimensional consistency of the shell.
Solution Approach 2:
The groove segments are designed with different depths and configurations at different locations on the first wall. The first groove segment has a first depth, the second groove segment has a second depth greater than the first depth, and the third groove segment has a third depth greater than the first depth. This local variation in groove quality allows for optimized pressure relief at different locations while minimizing impact on dimensional consistency.
2Reliability
If the first groove is fabricated on the first wall for pressure relief, then the pressure relief function is improved, but local size increase and planeness reduction occur
Solution Approach 1:
The first groove is segmented into multiple groove segments distributed at different positions on the first wall. This segmentation distributes the material extrusion effect across multiple locations rather than concentrating it at one location, thereby reducing the impact on local planeness and shape of the first wall.
Solution Approach 2:
The groove segments are designed with varying depths in the thickness direction of the first wall. By introducing depth variation as an additional dimension, the pressure relief function is enhanced while the extrusion effect is confined to specific depth ranges, minimizing the impact on the external planeness of the first wall.
3Reliability
If the first groove segment is formed by extrusion, then the pressure relief capability is improved, but material extrusion causes arching and deformation
Solution Approach 1:
The first groove is divided into multiple groove segments (first, second, and third groove segments) with different depths and positions. This segmentation allows the extrusion process to be distributed across multiple locations, preventing excessive material accumulation at any single location and thereby reducing arching and deformation while maintaining pressure relief capability.
Solution Approach 2:
The groove segments are designed with different depths (first depth, second depth greater than first depth, third depth greater than first depth) and different positions on the first wall. By changing the depth parameter at different locations, the pressure relief capability is optimized while controlling the extent of material extrusion to maintain size consistency.
Data Source
AI summary
A battery cell, a battery, and an electrical apparatus are disclosed. The battery cell includes a shell having a first wall and a second wall joined together. The first wall is formed with a groove that ruptures during pressure relief to release internal pressure. The second wall is located adjacent to the first wall in a first direction, and the groove includes a segment aligned with the second wall in that direction. The first wall also has a second groove, and in the thickness direction of the first wall, the projection of the second groove lies between the projection of the groove segment and the outer surface of the second wall. This structure allows the second groove to absorb excess material produced during formation of the first groove segment, thereby reducing arching or loss of flatness in the first wall and improving stability of the battery cell.