Roughened Patch Friction for Battery Cell Stability
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Solution Overview
Problem
Battery cells face reliability issues due to metal particles puncturing the electrode assembly, leading to short circuits and increased risk of failure during external impacts, as smooth insulating members provide low friction resistance, allowing electrode assemblies to slide and vibrate within the housing.
Innovation Solution
A patch with increased surface roughness is attached to the insulating member on the outer side of the electrode assembly, providing higher friction resistance and reducing sliding, thereby enhancing the battery's reliability by minimizing the risk of short circuits and failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a smooth insulating member is used, then the manufacturing process is simple, but the electrode assembly slides and vibrates during external impacts, reducing reliability
Solution Approach 1:
The insulating member has different surface roughness in different regions: the first surface in contact with the electrode assembly remains smooth for easy manufacturing, while the second outer surface has increased roughness (through protrusions or roughening treatment) to provide friction resistance during external impacts. This local differentiation resolves the contradiction between manufacturing simplicity and impact resistance.
Solution Approach 2:
The insulating member is constructed as a composite structure with a base insulating material and an additional roughened layer or surface treatment. This composite approach maintains the insulating properties while adding friction resistance, thereby improving reliability without significantly complicating the manufacturing process.
2Reliability
If the insulating member has high friction resistance, then sliding of the electrode assembly is reduced, but the insulating member structure becomes more complex
Solution Approach 1:
The insulating member has different surface roughness in different regions: the first surface in contact with the electrode assembly remains smooth for easy manufacturing, while the second outer surface has increased roughness (through protrusions or roughening treatment) to provide friction resistance during external impacts. This local differentiation resolves the contradiction between manufacturing simplicity and impact resistance.
Solution Approach 2:
Instead of making the entire insulating member rough, only a partial region (the second outer surface) is roughened to provide sufficient friction resistance. This partial action achieves the reliability improvement without requiring complete structural complexity throughout the entire insulating member.
3Reliability
If the patch covers a large area, then friction resistance is increased, but the space for electrolyte is reduced
Solution Approach 1:
The insulating member has different surface roughness in different regions: the first surface in contact with the electrode assembly remains smooth for easy manufacturing, while the second outer surface has increased roughness (through protrusions or roughening treatment) to provide friction resistance during external impacts. This local differentiation resolves the contradiction between manufacturing simplicity and impact resistance.
Solution Approach 2:
Instead of making the entire insulating member rough, only a partial region (the second outer surface) is roughened to provide sufficient friction resistance. This partial action achieves the reliability improvement without requiring complete structural complexity throughout the entire insulating member.
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 roughened patch reduces sliding and misalignment of the electrode assembly, improving the battery's reliability and energy density by increasing friction resistance and protecting against external impacts.
Implementation Method 1
the adhesive layer is arranged between the first outer surface and the base layer and adheres the first outer surface and the base layer
Implementation Method 2
surface roughness of at least a partial region of the second outer surface is greater than surface roughness of the first outer surface... the patch encounters relatively large friction resistance, so that sliding of the electrode assembly in the housing is reduced
Data Source
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AI summary
The present application discloses a battery cell, a battery, and a power consuming device. The battery cell includes a housing, an electrode assembly, an insulating member, and a patch. The electrode assembly is accommodated in the housing. The insulating member is arranged on an outer side of the electrode assembly, and the insulating member has a first outer surface on a side facing away from the electrode assembly. The patch is attached to the first outer surface and covers a part of the first outer surface, the patch has a second outer surface on a side facing away from the insulating member, and surface roughness of at least a partial region of the second outer surface is greater than surface roughness of the first outer surface.