Solid-State Battery Cell Stacking for Stress-Resistant Series Layout
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Solution Overview
Problem
Lithium secondary batteries with liquid electrolytes face challenges in achieving high voltage, stability, and mechanical strength due to internal stress from sintering shrinkage and repeated charging/discharging cycles, which can lead to electrolyte leakage, fire, and explosion risks.
Innovation Solution
An all-solid-state battery design with a specific stacking configuration of negative and positive electrode layers and solid electrolyte layers, along with connection electrodes, to enhance structural stability and mechanical strength, and improve long-term reliability by reducing the number of stacked layers and minimizing poor contact between dissimilar materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a ceramic-based solid electrolyte is used to improve stability, then high stability is achieved, but internal stress remains due to sintering shrinkage difference and mechanical strength is lowered due to repeated contraction and expansion
Solution Approach 1:
The patent applies parameter changes by controlling the sintering temperature (900°C to 1100°C) and composition ratios (Li content 0.9-1.1, Al content 0.1-0.3) of the ceramic-based solid electrolyte to optimize both stability and mechanical strength, reducing internal stress while maintaining structural integrity during repeated charging and discharging cycles
Solution Approach 2:
The patent uses composite materials by combining ceramic-based solid electrolyte with specific electrode materials (positive electrode containing LiCoO2, LiMn2O4, or LiFePO4 and negative electrode containing Li metal or Li alloy) to create a structured composite that distributes stress and maintains mechanical strength while preserving the high stability of the ceramic electrolyte
2Quantity of substance
If the number of stacked layers is increased to improve capacitance, then discharge capacitance increases, but structural stability decreases and mechanical strength is lowered
Solution Approach 1:
The patent applies dimensionality change by arranging battery cells in a three-dimensional stacked configuration where multiple cells are positioned at different heights and connected through lateral connection electrodes, increasing discharge capacitance through spatial optimization rather than simply increasing the number of layers in a single stack
Solution Approach 2:
The patent uses segmentation by dividing the battery into multiple independent battery cells (first, second, and third battery cells) that are stacked and connected through connection electrodes, allowing each cell to maintain structural integrity while collectively providing higher discharge capacitance
3Productivity
If battery cells are closely stacked to improve energy density, then space utilization increases, but internal stress accumulates and long-term reliability decreases
Solution Approach 1:
The patent applies segmentation by dividing the battery into separate battery cells with connection electrodes between them, which isolates internal stress to individual cells while maintaining high energy density through compact three-dimensional stacking, preventing stress accumulation that would compromise long-term reliability
Solution Approach 2:
The patent uses connection electrodes as intermediary elements between battery cells that facilitate electrical connection while providing mechanical separation and stress isolation, enabling closely stacked configuration for high energy density without compromising long-term reliability through stress accumulation
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 design provides structural stability, improved mechanical strength, and enhanced long-term reliability for all-solid-state batteries, reducing the risk of mechanical stress and improving capacitance without increasing the number of stacked layers.
Implementation Method 1
a first solid electrolyte layer... a second solid electrolyte layer... a third solid electrolyte layer
Implementation Method 2
electricity is generated or consumed by an oxidation reduction reaction according to the insertion and desorption of lithium ions
Data Source
AI summary
A all-solid-state battery includes a first battery cell in which a negative electrode current collector including a negative electrode lead portion, a first negative electrode layer, a first solid electrolyte layer and a first positive electrode layer are sequentially stacked, a second battery cell in which a second positive electrode layer, a second solid electrolyte layer and a second negative electrode layer are sequentially stacked, a third battery cell in which a third negative electrode layer, a third solid electrolyte layer, a third positive electrode layer, and a positive electrode current collector including a positive electrode lead portion are sequentially stacked, a first connection electrode connected to the first positive electrode layer and the second negative electrode layer, and a second connection electrode connected to the second positive electrode layer and the third negative electrode layer. The first to third battery cells are connected in series.