Battery Cell Housing Transition Wall Structure Against Deformation
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Solution Overview
Problem
The deformation of battery cell housings due to stress concentration and gas production during the production and use of battery cells is a significant issue that affects the structural integrity and performance of the battery.
Innovation Solution
The introduction of a transition region between adjacent second walls in the housing, where the maximum thickness of the transition region is greater than the maximum thickness of the second walls, reduces stress concentration and enhances structural strength, while maintaining a balanced manufacturing difficulty.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the housing wall thickness is increased to enhance structural strength, then the resistance to deformation improves, but the manufacturing difficulty and material usage increase
Solution Approach 1:
The patent applies local quality by varying the wall thickness of the housing according to the stress distribution pattern. The transition region between adjacent second walls has increased thickness to handle stress concentration, while other regions maintain optimal thickness for manufacturing. This localized thickening approach enhances structural strength precisely where needed without uniformly increasing manufacturing complexity throughout the entire housing.
2Reliability
If the transition region thickness is increased to reduce stress concentration, then the structural reliability improves, but the manufacturing precision requirements increase
Solution Approach 1:
The patent employs spheroidality by designing the transition region with a curved, rounded profile between adjacent second walls instead of sharp corners or abrupt thickness changes. This curved transition distributes stress more evenly and reduces stress concentration points. The gradual thickness variation achieved through curvature is more tolerant to manufacturing variations compared to sharp geometric transitions, thereby improving reliability without excessively demanding manufacturing precision.
3Strength
If the housing structure is optimized for strength, then the resistance to gas expansion pressure improves, but the internal volume available for battery components decreases
Solution Approach 1:
The patent applies local quality by strategically thickening only the transition regions between adjacent second walls where stress concentration occurs during gas expansion. The majority of the housing walls maintain their standard thickness, preserving maximum internal volume for battery components. This localized reinforcement approach provides sufficient resistance to gas expansion pressure while minimizing the volume penalty compared to uniform thickening of the entire housing structure.
Data Source
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AI summary
Embodiments of the present application provides a housing, a battery cell, a battery, and an electrical apparatus. The housing is provided with an opening, and comprises a first wall arranged opposite to the opening and at least two second walls, wherein the first wall and the second walls are arranged to intersect each other. A transition area is arranged between every two adjacent second walls among the at least two second walls, and the maximum thickness T1 of the transition area and the maximum thickness TO of the second wall with the maximum thickness among the second walls meet: T1>T0. The housing, the battery cell, the battery and the electrical apparatus in the embodiments of the present application are conducive to solving the problem of housing deformation of battery cells in production and assembly process, and the problem of deformation of housings caused by gas generation and expansion during use.