All-Solid-State Battery Lamination for Uniform Cell Pressurization
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Solution Overview
Problem
Existing manufacturing methods for all-solid-state batteries face challenges such as low mass productivity, asymmetric pressurization leading to cell lifespan degradation, non-uniform deformation causing short circuits, and lithium deposition issues resulting in capacity deterioration and safety risks.
Innovation Solution
A manufacturing method involving a mechanical structure sheet for uniaxial pressurization, using a reel-type solid electrolyte/negative electrode sheet and magazine-type positive electrode, with a hybrid reel-to-sheet and magazine combination, and multi-stage vacuum roll press to ensure uniform pressurization and insulation, enhancing stack processability and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If warm isostatic press (WIP) is used for pressurization, then pressurization effectiveness is improved, but mass productivity deteriorates due to packaging and unpackaging processes
Solution Approach 1:
The invention divides the pressurization process into separate stages: first pressing the electrode assembly, then pressing the solid electrolyte layer independently. This segmentation eliminates the need for packaging and unpackaging operations, allowing continuous production while maintaining effective pressurization of each component.
Solution Approach 2:
The electrode assembly is pressed before the solid electrolyte is introduced and pressed separately. This preliminary action allows the electrode structure to be stabilized first, then the solid electrolyte is added and pressed without requiring repackaging, thereby improving productivity while maintaining pressurization effectiveness.
2Stress or pressure
If warm isostatic press (WIP) is used for pressurization, then pressurization effectiveness is improved, but cell lifespan deteriorates due to asymmetric surface conditions
Solution Approach 1:
The pressurization is segmented into two independent pressing operations: one for the electrode assembly and another for the solid electrolyte layer. Each pressing operation applies uniform pressure to its respective component on both upper and lower surfaces, preventing asymmetric surface conditions and ensuring uniform contact, thereby extending cell lifespan.
Solution Approach 2:
The invention ensures that both the upper and lower surfaces of each component (electrode assembly and solid electrolyte) experience equal pressure conditions during pressing. This equipotential pressure distribution prevents asymmetric surface formation and ensures uniform stress distribution throughout the battery cell, improving longevity.
3Productivity
If uniaxial plate press (P/P) or roll press (R/P) is used for pressurization, then productivity is improved, but manufacturing precision deteriorates due to non-uniform pressurization and deformation
Solution Approach 1:
The invention transitions from uniaxial pressing to biaxial pressing by applying pressure from both upper and lower directions simultaneously. This dimensional change ensures uniform pressurization across the entire surface of each component, preventing non-uniform deformation and short circuits while maintaining high productivity through continuous processing.
4Ease of operation
If no pressure is applied to battery cell during charging, then ease of operation is improved, but reliability deteriorates due to non-uniform lithium deposition and solid electrolyte breakdown
Solution Approach 1:
The battery cell is pressed in advance before the charging process begins. This preliminary pressing action establishes uniform contact between the solid electrolyte and electrodes, ensuring that lithium ions are deposited uniformly during charging. This prevents localized stress concentration and solid electrolyte breakdown, maintaining reliability while keeping the charging operation simple.
Solution Approach 2:
The invention applies pressure beforehand to the battery cell to create a cushioning effect that prevents non-uniform lithium deposition during charging. This prior cushioning ensures uniform stress distribution and prevents localized breakdown of the solid electrolyte, thereby maintaining battery safety without complicating the charging operation.
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 improves productivity, ensures uniform pressurization, prevents short circuits, and enhances the safety and lifespan of all-solid-state batteries by providing a buffering function and insulation between electrodes.
Implementation Method 1
a multi-stage vacuum roll press to ensure uniform pressurization
Implementation Method 2
multi-stage vacuum roll press
Data Source
AI summary
The present disclosure relates to a manufacturing method of an all-solid-state battery, and the manufacturing method of the all-solid-state battery of an embodiment includes supplying a reel-type mechanical structure sheet by partitioning a corresponding member having a blank corresponding to a positive electrode of a battery cell and a buffering part corresponding to the outside of the battery cell by repetition of a cutting line and a non-cut part; placing a magazine-type positive electrode on the blank; supplying a first solid electrolyte/negative electrode sheet and a second solid electrolyte/negative electrode sheet in a reel type by attaching a solid electrolyte and a negative electrode to the lower and upper parts of the mechanical structure sheet on which the positive electrode is assembled; pre-laminating the first solid electrolyte/negative electrode sheet, the mechanical structure sheet on which the positive electrode is assembled, and the second solid electrolyte/negative electrode sheet; and separating bi-cells by cutting a pre-laminated first laminate under pressure.