Wound Battery Separator Protrusion for Drop Resistance and Impregnation
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Solution Overview
Problem
Existing batteries face issues with dropping resistance and inadequate electrolyte impregnation, particularly when the bottom side of the electrode body faces downward, leading to potential leakage and reduced performance.
Innovation Solution
The battery design includes a specific configuration where the separator protrudes from the electrode body's end face, with defined ratios of protrusion and width, ensuring stable impregnation and improved dropping resistance by using a molded separator part and insulating tape to secure the electrode leads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the separator protrudes significantly from the electrode body end face, then the dropping resistance is improved, but the electrolyte impregnation becomes inadequate
Solution Approach 1:
The patent optimizes the protrusion amount of the separator as a specific parameter, defining it as 0.005 to 0.02 times the width of the electrode body. This parameter optimization ensures that the separator protrudes enough to provide dropping resistance while maintaining adequate electrolyte impregnation, resolving the contradiction between reliability and manufacturing precision.
2Manufacturing precision
If the separator protrusion is minimized, then the electrolyte impregnation is improved, but the dropping resistance deteriorates
Solution Approach 1:
The patent establishes a minimum protrusion threshold of 0.005 times the electrode body width to ensure adequate dropping resistance. This parameter setting prevents the separator from being too close to the electrode body, which would cause short circuits, while also avoiding excessive protrusion that would hinder electrolyte impregnation.
3Reliability
If the separator protrusion is excessive, then the dropping resistance is improved, but the risk of short circuit increases
Solution Approach 1:
The patent sets the maximum protrusion amount at 0.02 times the electrode body width. This parameter control ensures the separator maintains sufficient distance from the electrode body to prevent short circuits while providing adequate dropping resistance, thus resolving the contradiction between reliability and harmful factors.
Data Source
AI summary
A battery includes an electrode body having a winding structure, and an electrolyte solution. The electrode body and the electrolyte solution are accommodated in a case. The electrode body includes: a positive electrode that includes a positive electrode lead, and has a belt shape; a negative electrode that includes a negative electrode lead, and has the belt shape; and a separator that is provided between the positive electrode and the negative electrode, and has the belt shape. The positive electrode lead and the negative electrode lead are led out from a first end face of the electrode body. The electrode body includes a molded part of the separator, and the molded part protrudes from a second end face.