Stacked All-Solid-State Battery Antecedent Short Circuit Layer
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Solution Overview
Problem
Stacked all-solid-state batteries face issues with increased resistance and output degradation due to small cross-sectional areas of fuse portions, leading to excessive Joule heat during short circuits, which existing technologies fail to adequately address.
Innovation Solution
Incorporating an antecedent short circuit layer with a first metal layer, a second metal layer, and an aluminum layer having an oxide film between them, electrically connected to the cathode and anode current collectors, allows for a large sneak current to fuse the fuse portion without reducing the cross-sectional area, thereby inhibiting Joule heat and maintaining battery output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the cross sectional area of the fuse portion is made small to enable fusion by overcurrent, then the fuse portion can fuse by overcurrent, but the resistance of the current collector increases and the output of the battery degrades
Solution Approach 1:
The current collector is divided into two distinct functional segments: a normal section with sufficient cross-sectional area to maintain low resistance and high power output, and a fuse portion with reduced cross-sectional area designed to fuse under overcurrent conditions. This segmentation allows each part to fulfill its specific function without compromising the other.
Solution Approach 2:
The fuse portion is created by locally changing the shape of the current collector (reducing thickness or width) only in the specific area where fusion is needed, while the rest of the current collector maintains its original dimensions and properties. This localized modification ensures that the fuse function is achieved without increasing the resistance of the entire current collector.
2Quantity of substance
If the number of stacked power generation elements is increased to improve battery capacity, then the battery capacity increases, but the Joule heat when a short circuit occurs increases due to increased electron flow from multiple elements
Solution Approach 1:
The fuse portion is pre-configured in the current collector before operation, serving as a predetermined safety mechanism. When a short circuit occurs in any power generation element, the fuse portion is designed to rapidly fuse and interrupt the current flow from all stacked elements, preventing the cumulative Joule heat that would otherwise result from multiple elements continuing to supply electrons to the shorted element.
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 solution effectively reduces resistance during short circuits, allowing for immediate fusion of the fuse portion and minimizing Joule heat, thus preventing output degradation and heat buildup in stacked all-solid-state batteries.
Implementation Method 1
an aluminum layer provided between the first metal layer and the second metal layer, the aluminum layer including an oxide film on its surface
Implementation Method 2
a fuse portion that fuses by overcurrent
Data Source
AI summary
A stacked all-solid-state battery includes: a stacked body including stacked power generation elements each having a cathode current collector layer and so on; and an antecedent short circuit layer arranged outside the stacked body. In the battery, at least one of the cathode current collector layer and the anode current collector layer includes a fuse portion that fuses by overcurrent, the antecedent short circuit layer includes a first metal layer, a second metal layer and an aluminum layer provided between the first and second metal layers and including an oxide film on its surface; the elements have a parallel connection to each other, and the first and second metal layers are respectively and electrically connected with the cathode and anode current collector layers.