Wound Electrode Assembly Layout to Prevent Impact Short Circuits
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Solution Overview
Problem
Wound batteries face safety issues due to the breakage of the battery core, which can lead to short-circuits and fire explosions when impacted by heavy objects, primarily caused by the breakage of the plain aluminum foil at the outer electrode plate.
Innovation Solution
An electrode assembly design without an outer plain aluminum foil, featuring a first adhesive member on its surface to bond with the package, and a winding terminating end without active material coating on one surface, reducing the risk of short circuits and enhancing safety by eliminating aluminum chips and preventing relative displacement during impacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If an outer plain aluminum foil is used in the battery core, then the structural integrity and sealing are improved, but the risk of short circuits and fire explosions increases due to aluminum chip generation during impact
Solution Approach 1:
The patent removes the outer plain aluminum foil from the battery core structure. By extracting this component that causes aluminum chip generation during impact, the invention eliminates the source of short circuit hazards while maintaining structural integrity through alternative design configurations of the electrode plates and sealing mechanisms.
Solution Approach 2:
The invention converts the potential harm of aluminum foil breakage into a benefit by eliminating the plain aluminum foil entirely and replacing it with a design where the active material coating extends to the edges. This prevents chip generation while maintaining the necessary structural and sealing functions, turning a hazardous material configuration into a safe one.
2Ease of manufacture
If the battery core is packaged with clearance between the core and housing, then the packaging ease and manufacturing flexibility are improved, but the safety is worsened due to relative displacement during impact causing short circuits
Solution Approach 1:
The patent applies adhesive members to the outer surface of the battery core before final packaging. This preliminary action ensures that when the battery core is placed in the housing, the adhesive automatically prevents relative displacement during impact, eliminating short circuit risks without requiring precise clearance control or complex packaging structures.
Solution Approach 2:
The adhesive member acts as an intermediary between the battery core and the housing. It fills the clearance space and provides a bonding interface that prevents relative displacement during impact, thereby maintaining safety while allowing flexible packaging design with appropriate clearances for manufacturing and assembly.
3Reliability
If the first active material layer covers both surfaces of the first current collector at the winding terminating end, then the electrochemical performance is improved, but the manufacturing complexity increases due to precise coating requirements
Solution Approach 1:
The patent applies local quality by covering only the surface of the first current collector that faces toward the second electrode plate with the first active material layer at the winding terminating end. The other surface facing away from the second electrode plate is left without coating. This localized approach maintains necessary electrochemical functionality while simplifying manufacturing by eliminating the need for precise double-sided coating at the terminating end.
Data Source
AI summary
An electrode assembly formed by winding a first electrode plate, a separator and a second electrode plate. The first electrode plate comprises a first current collector and a first active material layer arranged on a surface of the first current collector. A winding terminating end of the first electrode plate is positioned on an outer side of a winding terminating end of the second electrode plate facing away from a winding core. The first active material layer on the winding terminating end of the first electrode plate covers one surface of the first current collector facing toward the second electrode plate. The electrode assembly further comprises a first adhesive member arranged on an outer surface of the electrode assembly. The electrode assembly takes the winding terminating end of the first electrode plate as the tail end. The application further provides a battery having the same.