Composite Solid Electrolyte Lamination for Lithium-Ion Battery Assembly
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Solution Overview
Problem
The current lithium-ion battery preparation process is complex and prone to errors, such as wrinkles in the separator leading to lithium dendrite formation and safety issues, due to the lack of surface bonding between electrode sheets and the need for precise alignment, which complicates the stacking and packaging process.
Innovation Solution
A method involving the use of composite solid electrolyte membranes laminated onto electrode sheets through a hot pressing process, allowing for better bonding and alignment without precise alignment requirements, using a battery forming device for pressing, trimming, shaping, and fixing to create a stable lithium-ion battery structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If stacking equipment is used to stack electrode sheets and separator alternately without surface bonding, then the stacking process is simple, but wrinkles form in the separator causing lithium dendrite formation and safety issues
Solution Approach 1:
The patent applies preliminary action by performing surface bonding treatment on the electrode sheets before the stacking process. The composite solid electrolyte membrane is bonded to the electrode sheet surfaces in advance, creating a bonded structure that prevents separator wrinkles during stacking, thus eliminating lithium dendrite formation while maintaining manufacturing simplicity
Solution Approach 2:
The patent uses composite materials by introducing a composite solid electrolyte membrane that combines organic and inorganic materials. This composite membrane provides both bonding functionality to prevent wrinkles and electrochemical performance, resolving the contradiction between simple stacking and battery safety
2Manufacturing precision
If high dimensional accuracy is required for accurate alignment of electrode sheets and separator, then alignment precision is improved, but the packaging process becomes complicated and the battery is prone to interference with packaging aluminum foil
Solution Approach 1:
The patent applies preliminary action by pre-bonding the composite solid electrolyte membrane to the electrode sheets before stacking. This pre-bonding creates a unified structure with larger dimensional tolerances, eliminating the need for high alignment accuracy during stacking and simplifying the packaging process while avoiding interference with packaging aluminum foil
Solution Approach 2:
The patent changes the dimensional tolerance parameter by introducing the bonded composite structure. The bonding creates a more robust assembly that can accommodate larger dimensional variations, thereby reducing the required alignment precision and simplifying subsequent packaging operations
3Manufacturing precision
If coating machine is used for fluid state solid electrolyte formation by injecting or coating method, then the solid electrolyte can be formed on electrode sheet surface, but the preparation process becomes complex and difficult to control
Solution Approach 1:
The patent extracts the solid electrolyte formation process from the complex coating/injection methodology and replaces it with a simpler lamination approach using pre-formed composite solid electrolyte membranes. This extraction eliminates the need for coating machines and complex flow control while maintaining solid electrolyte quality
Solution Approach 2:
The patent replaces the mechanical coating/injection system with a thermal bonding system. Instead of using coating machines to deposit fluid electrolyte, the method uses hot pressing to laminate pre-formed composite solid electrolyte membranes onto electrode sheets, substituting a complex mechanical deposition process with a simpler thermal bonding process
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 method simplifies the battery preparation process, enhances bonding between electrode sheets, reduces the risk of lithium dendrite formation, and improves the structural integrity and safety of the lithium-ion battery, making it suitable for industrial production with larger dimensional tolerances.
Implementation Method 1
Composite solid electrolyte membranes 3 are hot pressed onto surfaces of the electrode sheets 10, 20
Data Source
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AI summary
A method for preparing a lithium-ion battery is provided. The method comprises: S1, providing a positive electrode sheet and two composite solid electrolyte membranes, and applying the positive electrode sheet between the two composite solid electrolyte membranes to form a positive electrode composite structure; S2, providing a negative electrode sheet and two composite solid electrolyte membranes, applying the negative electrode sheet between the two composite solid electrolyte membranes to form a negative electrode composite structure; S3, stacking at least one positive electrode composite structure and at least one negative electrode composite structure to form a battery preform; and, S4, pressing the battery preform, and the composite solid electrolyte membranes in the battery preform is trimmed, shaped and fixed to obtain the lithium-ion battery.