Solid Electrolyte Lamination for Wrinkle-Free Li-Ion Battery Stacking
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current lithium-ion battery preparation processes face challenges with wrinkle formation in separators, lithium dendrite precipitation, and the need for precise alignment of electrode sheets, leading to safety issues and complexity in the stacking process.
Innovation Solution
A method involving the use of composite solid electrolyte membranes laminated on electrode sheets through a hot pressing process, allowing for the formation of positive and negative electrode composite structures with a transition layer for improved bonding and alignment, enabling the stacking of these structures without precise alignment requirements, and subsequent pressing, trimming, and shaping to form a stable lithium-ion battery.
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 preparation, then the stacking process is simpler, but wrinkles form in the separator causing lithium dendrites and safety accidents
Solution Approach 1:
The patent applies preliminary action by performing surface bonding preparation on the electrode sheets before stacking. A coating layer is formed on the surface of the electrode sheets in advance, which enables reliable bonding during stacking without requiring complex real-time control during the stacking process itself. This resolves the contradiction by preparing the bonding surface beforehand, allowing simple stacking equipment to produce safe, wrinkle-free assemblies.
2Manufacturing precision
If high dimensional accuracy is required for accurate alignment of electrode sheets during stacking, then alignment precision is improved, but the process complexity and difficulty increase
Solution Approach 1:
The patent introduces an intermediary coating layer on the electrode sheet surfaces that facilitates alignment and bonding. This coating layer acts as a mediator that allows electrode sheets to be accurately positioned and bonded together without requiring extremely precise stacking equipment. The coating provides a tolerant interface that compensates for minor misalignments, achieving high manufacturing precision with simpler stacking devices.
3Ease of manufacture
If the solid electrolyte is applied by injecting or coating method in fluid state, then the electrolyte can be formed on electrode surface, but a coating machine is required making the process complex and difficult to control
Solution Approach 1:
The patent changes the physical state parameter of the electrolyte application process. Instead of applying electrolyte in fluid state requiring coating machines, the invention uses a solid electrolyte that can be directly coated or laminated onto the electrode sheets. This parameter change from fluid to solid state eliminates the need for complex coating equipment and flow control systems, simplifying manufacturing while maintaining precise electrolyte layer formation.
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, reduces the risk of lithium dendrite formation, enhances the structural integrity and safety of the battery, and allows for larger dimensional errors, making it suitable for industrial production while maintaining high cycle performance.
Implementation Method 1
composite solid electrolyte membranes 3 laminated on the surface of the positive electrode sheet 10 and the negative electrode sheet 20 through a hot pressing process
Implementation Method 2
composite solid electrolyte membranes 3 laminated on the surface of the positive electrode sheet 10 and the negative electrode sheet 20
Data Source
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.