Sheet-Laminated Battery Self-Adhering Separator
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Solution Overview
Problem
Sheet-laminated lithium ion secondary batteries face performance deterioration due to non-uniform electrode distances when bent, leading to gaps between electrodes and separators, which hinders electron transfer and increases manufacturing costs and complexity.
Innovation Solution
Incorporating a sheet thermoplastic resin layer with polar groups and ion permeability between the cathode and anode sheets and the separator, and between the sheets and the outer casing, which allows for uniform electrode spacing through expansion and contraction, maintaining flexibility and omitting drying steps in the manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a solvent-type adhesive is used to bond electrode sheets and separator, then the flexibility and contact stability are improved, but the manufacturing steps increase and productivity decreases
Solution Approach 1:
The invention extracts and eliminates the solvent-type adhesive from the battery structure, replacing it with a self-adhering separator that inherently provides bonding function through its material properties rather than requiring additional adhesive layers and drying processes
Solution Approach 2:
The separator is designed to perform its own bonding function through self-adhesion properties, eliminating the need for separate adhesive materials and the drying steps associated with solvent-based adhesives, thereby improving productivity while maintaining contact stability
2Reliability
If a solvent-type adhesive is used to bond electrode sheets and separator, then the flexibility and contact stability are improved, but the manufacturing cost increases
Solution Approach 1:
The invention removes the solvent-type adhesive component from the battery assembly, replacing it with a separator that possesses inherent self-adhering properties, thereby eliminating the need for separate adhesive materials and associated manufacturing costs
Solution Approach 2:
The self-adhering separator serves as a cost-effective solution by integrating bonding functionality into the separator itself, eliminating the need for expensive solvent-type adhesives and the additional processing steps they require
3Manufacturing precision
If electrode sheets and separator are laminated tightly, then the distance uniformity is improved, but the flexibility and bendability decrease
Solution Approach 1:
The invention employs a self-adhering separator that provides dynamic bonding - maintaining tight contact and uniform distance during normal operation while allowing the battery to flex and bend when needed, achieving both precision and adaptability through the separator's material properties
Solution Approach 2:
The separator's adhesion parameters are optimized to provide sufficient bonding force for maintaining uniform electrode distance while allowing controlled flexibility, enabling the battery to maintain precision during operation and adaptability during bending through parameter optimization
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
This solution maintains high battery performance by preventing electrode separation, improving capacity retention, and reducing manufacturing costs and complexity by eliminating the need for additional drying steps.
Implementation Method 1
the sheet thermoplastic resin layer comprises a thermoplastic resin having introduced therein a polar group derived from a carboxylic acid
Implementation Method 2
a sheet thermoplastic resin layer which comprises a thermoplastic resin having introduced therein a polar group derived from a carboxylic acid
Implementation Method 3
the sheet thermoplastic resin layer has through-holes in a plan view
Data Source
Figure 1A~1B
Figure 2~3
Figure 4~5
AI summary
A sheet-laminated lithium ion secondary battery comprising: a membrane electrode assembly which comprises a cathode sheet comprising a cathode current collector having formed thereon a cathode active material layer, and an anode sheet comprising an anode current collector having formed thereon an anode active material layer, the cathode sheet and the anode sheet being laminated through a separator; and a sheet outer casing having accommodated therein the membrane electrode assembly, wherein, in the membrane electrode assembly, a sheet thermoplastic resin layer is inserted as at least one of an interlayer between the cathode sheet and the separator, and an interlayer between the anode sheet and the separator.