Deformation Prevention Strap for Lithium Battery Electrode Assembly
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Solution Overview
Problem
Lithium secondary battery electrode assemblies tend to unwind due to the elasticity of metal electrode collectors and can swell during erroneous operations like overcharging, leading to short circuits and reduced thermal stability.
Innovation Solution
A deformation prevention strap, typically an adhesive tape made of materials like polyethylene, polypropylene, or polyphenylene sulfide, is wound around the electrode assembly in a direction perpendicular to its winding direction to prevent unwinding and swelling, ensuring the assembly remains stable during charging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If winding fixation tapes are used to prevent unwinding, then the electrode assembly remains wound, but the tapes cannot prevent swelling during overcharging
Solution Approach 1:
The deformation prevention means is divided into multiple segments positioned at different locations around the electrode assembly. Each segment independently restricts deformation in its local area, collectively providing comprehensive prevention against both unwinding and swelling while maintaining structural stability
Solution Approach 2:
The deformation prevention means is pre-installed on the electrode assembly before battery operation. This preliminary protective structure proactively counteracts potential unwinding and swelling forces that may occur during charging, particularly during overcharging conditions, before deformation can occur
2Reliability
If multiple deformation prevention means are added to the battery, then thermal stability improves, but device complexity increases
Solution Approach 1:
The deformation prevention means is designed to perform multiple functions simultaneously: preventing unwinding of the wound structure, preventing swelling during overcharging, and maintaining thermal stability. This multi-functional design avoids the need for separate components for each protective function, thereby reducing overall structural complexity
Solution Approach 2:
Multiple deformation prevention means are strategically positioned and integrated into a unified protective system around the electrode assembly. Rather than adding independent, separate protective mechanisms, they are merged into a coordinated structure that works together to provide comprehensive protection while minimizing added complexity
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 deformation prevention strap effectively prevents the electrode assembly from unwinding and swelling, thereby preventing short circuits and enhancing the thermal stability and safety of the lithium secondary battery.
Implementation Method 1
these wound electrode assemblies may become unwound due the elasticity of the metal electrode collectors
Data Source
AI summary
Lithium secondary batteries having deformation prevention straps for preventing the electrode assemblies of the lithium secondary batteries from deforming and methods for manufacturing the same are disclosed. A lithium secondary battery comprises an electrode assembly comprising a first electrode plate having a first electrode tab attached thereto, a second electrode plate having a second electrode tab attached thereto, and a separator between the first and second electrode plates. The electrode assembly is formed by winding the first and second electrode plates and the separator. A deformation prevention strap is attached to at least a portion of the electrode assembly and is wound in a direction substantially perpendicular to the direction in which the electrode assembly is wound. The electrode assembly, including the deformation prevention strap, is enclosed within a battery case. A cap assembly seals the case and comprises an electrode terminal electrically connected to the electrode assembly.