Nylon Finishing Tape for Wound Battery Expansion Relief
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Solution Overview
Problem
Existing secondary battery finishing tapes made of materials like PP, PET, or OPS do not chemically react with electrolytes, leading to stress and potential deformation or cracking of the electrode assembly due to expansion, and are difficult to manufacture thinly, limiting battery capacity.
Innovation Solution
A finishing tape made of nylon material that chemically reacts with electrolytes to partially melt and form pores, allowing the electrode assembly to expand freely, and can be manufactured thinner than conventional materials, thereby preventing deformation and enhancing capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional finishing tape materials (PP, PET, OPS) are used, then the finishing tape maintains structural stability, but the electrode assembly experiences stress and deformation due to expansion, and the finishing tape cannot be manufactured thinly
Solution Approach 1:
The patent changes the material composition parameter of the finishing tape from conventional materials (PP, PET, OPS) to nylon material, which fundamentally alters its interaction with electrolytes. This parameter change enables the finishing tape to chemically react with electrolytes, allowing it to partially melt and form pores, thereby resolving the contradiction between maintaining structural stability and enabling thin manufacturing.
Solution Approach 2:
The patent utilizes phase transition by designing the finishing tape to partially melt upon chemical reaction with electrolytes. This phase transition from solid to partially molten state allows the finishing tape to form pores and accommodate electrode assembly expansion, preventing stress and deformation while maintaining integrity. The controlled phase transition resolves the contradiction between structural stability and thickness reduction.
2Quantity of substance
If the finishing tape is made thinner to increase battery capacity, then the battery capacity improves, but the finishing tape becomes more difficult to manufacture and may compromise structural support
Solution Approach 1:
By changing the material parameter to nylon, the patent enables manufacturing of thinner finishing tapes that maintain sufficient mechanical properties. The nylon material's unique characteristic of chemical reaction with electrolytes provides self-adjusting structural support, allowing thinner designs without compromising manufacturing feasibility or structural integrity.
Solution Approach 2:
The finishing tape performs self-service by chemically reacting with electrolytes to automatically adjust its structure. This self-adjusting mechanism eliminates the need for complex manufacturing processes required for conventional thin materials, as the nylon finishing tape self-regulates its properties through chemical reaction, simplifying manufacturing while enabling thinner designs for increased battery capacity.
3Stability of the object's composition
If the finishing tape does not chemically react with electrolytes, then the finishing tape maintains dimensional stability, but stress accumulates causing electrode assembly deformation or cracking
Solution Approach 1:
The patent employs phase transition by designing the finishing tape to partially melt through chemical reaction with electrolytes. This controlled melting allows the finishing tape to transition from a rigid dimensional structure to a more compliant state that can accommodate electrode expansion, preventing stress accumulation and deformation while maintaining overall integrity through the adhesive layer.
Solution Approach 2:
The patent uses composite material structure combining nylon film layer with adhesive layer. The nylon layer provides chemical reactivity and pore formation, while the adhesive layer maintains dimensional stability and bonding. This composite approach resolves the contradiction between dimensional stability and prevention of electrode assembly deformation through synergistic material properties.
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 nylon finishing tape allows the electrode assembly to expand without restraint, preventing deformation and cracking, while enabling a thinner design that increases battery capacity.
Implementation Method 1
the film layer may chemically react with the electrolyte to be at least partially melted and/or to form pores
Implementation Method 2
the film layer may chemically react with the electrolyte to be at least partially melted and/or to form pores
Data Source
AI summary
A secondary battery, includes an electrode assembly including a first electrode plate, a second electrode plate, and a separator wherein the electrode assembly is wound; a can for accommodating the electrode assembly and an electrolyte; a finishing tape including a film layer comprising a nylon material and an adhesive layer for attaching the film layer to the electrode assembly, wherein the finishing tape at least partially surrounds the electrode assembly; and a cap assembly that seals the can.