Series-Connected Solid-State Battery Cell Layout for High Voltage
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Solution Overview
Problem
Existing all-solid-state batteries face challenges in achieving high-voltage capabilities while maintaining stability and safety.
Innovation Solution
The all-solid-state battery design incorporates a series connection of unit cells, each comprising a positive electrode active material layer, a negative electrode active material layer, and a solid electrolyte layer, with margin layers and internal current collecting layers to manage ion conductivity and current distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a stacked oxide all-solid-state battery uses oxide electrolyte with lower ion conductivity, then stability is improved, but voltage capability deteriorates
Solution Approach 1:
The battery is divided into multiple unit cells connected in series, where each unit cell contains a positive electrode active material layer, negative electrode active material layer, and solid electrolyte layer. This segmentation allows the battery to achieve high voltage capability through series connection while maintaining the stability benefits of oxide electrolyte in each individual unit cell.
Solution Approach 2:
Margin layers are selectively formed at specific locations (edges of positive electrode active material layers and between adjacent unit cells) with different ionic conductivity characteristics. These local quality variations optimize ion transport paths while maintaining overall battery stability, resolving the contradiction between stability and voltage capability.
2Manufacturing precision
If margin layers with low ionic conductivity are formed at edges, then manufacturing precision is improved, but ion transport efficiency deteriorates
Solution Approach 1:
The margin layers are strategically placed only at critical edge locations where manufacturing precision is needed for alignment between unit cells, rather than throughout the entire electrode structure. This localized approach maintains manufacturing precision benefits while minimizing the impact on overall ion transport efficiency.
Solution Approach 2:
The margin layers act as intermediary elements that facilitate precise alignment between adjacent unit cells during manufacturing. By confining these low ionic conductivity regions to specific marginal areas, the patent enables accurate edge-to-edge alignment while preserving high ion transport efficiency in the main electrode regions.
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 configuration enables the implementation of high-voltage batteries by expanding material selection and improving stability and process margins, while reducing current concentration and enhancing overall battery performance.
Implementation Method 1
a solid electrolyte layer disposed between the first positive electrode active material layer and the second negative electrode active material layer in a stacking direction
Data Source
AI summary
An all-solid-state battery has opposing first and second side surfaces and includes: a first unit cell including a first positive electrode active material layer including a first margin layer in one side direction close to the first side surface, a second negative electrode active material layer including a second margin layer in the one side direction and the other side direction, and a solid electrolyte layer disposed between the active material layers; and a second unit cell including a second positive electrode active material layer including a second margin layer in the one side direction and the other side direction, a first negative electrode active material layer including a first margin layer in the other side direction close to the second side surface, and a solid electrolyte layer disposed between the active material layers. The first unit cell and the second unit cell are connected in series.