Battery Cell Insulating Member Roughness to Prevent Electrode Sliding
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Solution Overview
Problem
Battery cells are prone to failure due to the low frictional resistance between the separator and other components, leading to electrode assembly sliding and potential damage during external impacts, which affects their reliability.
Innovation Solution
An insulating member with increased surface roughness is attached to the electrode assembly, enhancing frictional resistance and reducing sliding, thereby improving the battery cell's reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the separator has a smooth surface, then the manufacturing process is simple, but the frictional resistance is low causing electrode assembly sliding during external impacts
Solution Approach 1:
The patent changes the surface roughness parameter of the insulating member from smooth to rough (Ra≥10μm) to increase frictional resistance. This parameter modification prevents electrode assembly sliding during external impacts while maintaining manufacturing feasibility through standard surface treatment processes.
Solution Approach 2:
The patent applies roughening treatment to specific regions of the insulating member rather than the entire surface. The outer surface facing away from the electrode assembly has Ra≥10μm, while other regions may have different surface characteristics, optimizing both reliability and manufacturing efficiency.
2Reliability
If the surface roughness of the insulating member is increased, then the frictional resistance increases reducing electrode assembly sliding, but the space occupied by the insulating member increases
Solution Approach 1:
The patent modifies the surface roughness parameter (Ra≥10μm) of the insulating member to enhance frictional resistance without significantly increasing the component's volume. This allows the insulating member to prevent electrode assembly sliding while minimizing space occupation and energy density loss.
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 increased frictional resistance of the insulating member reduces the risk of electrode assembly sliding and failure, enhancing the battery cell's reliability and energy density while minimizing the need for roughening treatment areas.
Implementation Method 1
the surface roughness of at least some regions of an outer surface of the insulating member that faces away from the electrode assembly is greater than the surface roughness of the separator... the frictional resistance experienced by the insulating member is relatively great, thereby reducing the sliding of the electrode assembly in the shell
Data Source
AI summary
The present application discloses a battery cell, a battery, and an electrical device. The battery cell includes a shell, an electrode assembly, and an insulating member. The electrode assembly is accommodated in the shell and includes electrode plates and a separator, which are arranged in a stacked manner. The insulating member is attached to an outer side of the electrode assembly, and the surface roughness of at least some regions of an outer surface of the insulating member away from the electrode assembly is greater than the surface roughness of the separator.