Button Cell Curved Groove Venting for Internal Gas Pressure
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Solution Overview
Problem
Conventional button cells face safety and performance issues due to the accumulation of gas, which can lead to increased internal pressure and potential explosions if not effectively vented.
Innovation Solution
A button cell design featuring a housing with a groove on its first wall, where the groove includes at least two continuously connected curves, allowing for timely venting of internal gas and reducing the risk of excessive pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a groove is provided on the first wall to enable gas venting, then the safety of the button cell is improved, but the structural complexity of the housing increases
Solution Approach 1:
The groove is divided into multiple continuously connected curve segments instead of a single straight line, creating multiple stress concentration points that facilitate controlled breaking for gas venting while maintaining overall structural integrity
Solution Approach 2:
The groove creates localized thinning of the first wall at specific positions, concentrating the venting function in discrete locations rather than requiring comprehensive structural modifications throughout the housing
2Stress or pressure
If the groove includes at least two continuously connected curves to increase stress concentration points, then the pressure required for gas to break through is reduced, but the manufacturing precision requirements increase
Solution Approach 1:
The groove is designed with continuously connected curves instead of straight lines, creating multiple stress concentration points at the curve junctions. This curvature-based design reduces the pressure required for gas breakthrough while the continuous nature of the curves provides manufacturing tolerance
3Reliability
If the first projection occupies a relatively large proportion of the first wall to enhance connection reliability, then the electrical performance is improved, but the risk of gas being blocked by the first electrode tab increases
Solution Approach 1:
The groove extends beyond the projection boundary in the planar dimension, creating a spatial relationship where the groove path is not completely covered by the electrode tab projection. This dimensional arrangement allows gas to access the groove from directions not blocked by the tab
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 groove design effectively reduces the risk of explosions by allowing gas to escape before pressure becomes excessive, thereby enhancing the safety and performance of the button cell.
Implementation Method 1
When the internal pressure of the housing increases, the groove will first be broken through by the gas inside the housing
Implementation Method 2
the broken groove may vent the gas inside the housing, which helps reduce the risk of excessive internal pressure
Implementation Method 3
the groove includes at least two continuously connected curves, which may increase the stress concentration points of the groove, which helps reduce the pressure required for the gas inside the housing to break through the groove
Data Source
AI summary
A button cell includes an electrode assembly, a first electrode tab, and a housing provided with an accommodating cavity. The housing includes a first wall, a first end of the first electrode tab is connected to the electrode assembly, and a second end of the first electrode tab is connected to the first wall. The housing is provided with a groove including at least two continuously connected curves. Viewed from a direction perpendicular to the first wall, a projection of the first electrode tab on the first wall is a first projection, at least a portion of the at least two continuously connected curves is located outside the first projection, and a quantity of intersection points between a contour of the first projection and the at least two continuously connected curves is less than or equal to 2.