All-solid-state battery laminate with resin side fixing
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Solution Overview
Problem
Laminate-type all-solid-state batteries face issues with short circuits due to cracks in electrode layers and solid electrolyte layers caused by bundling current collector layers, which can lead to defects and performance degradation over time, especially under vehicle vibrations.
Innovation Solution
The battery design incorporates side surface fixing portions made of resin at specific positions around current collector layer protrusions, and optionally current collector layer reinforcing or attaching portions with reinforcing materials, to prevent stress and bending on the electrode and electrolyte layers, thereby suppressing the formation of cracks and short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If current collector layers are bundled to form laminate-type battery, then productivity and energy density are improved, but cracks occur in electrode layers and solid electrolyte layers causing short circuits
Solution Approach 1:
The current collector layer is divided into multiple protrusions instead of a single continuous structure. Each protrusion is independently positioned and can be separately managed during bundling, reducing stress concentration and preventing cracks in the electrode and electrolyte layers while maintaining productivity.
Solution Approach 2:
The protrusions are strategically positioned at specific locations where they provide structural support and stress distribution exactly where needed during bundling. This localized structural enhancement prevents cracks at critical points without requiring additional materials throughout the entire battery structure.
2Quantity of substance
If current collector layers are bundled tightly, then energy density is improved, but stress and bending occur causing cracks and short circuits
Solution Approach 1:
Segmenting the current collector into multiple protrusions allows the structure to accommodate bending and stress during tight bundling. The segmented design distributes mechanical stress across multiple points rather than concentrating it, preventing cracks while enabling high energy density through efficient space utilization.
Solution Approach 2:
The protrusion structure is designed in advance to provide cushioning and stress distribution capability before bundling occurs. This pre-configured structure absorbs and distributes the stress of tight bundling, preventing cracks in the electrode and electrolyte layers while maintaining high energy density.
3Reliability
If current collector protrusions are added, then short circuit prevention is improved, but device complexity increases
Solution Approach 1:
The current collector is segmented into protrusions that, while adding structural complexity, actually simplify the overall battery design by eliminating the need for additional protective layers or complex bonding structures. The protrusions inherently provide stress distribution and short circuit prevention functions.
Solution Approach 2:
The protrusion structure serves multiple functions simultaneously: it provides structural support during bundling, distributes stress to prevent cracks, maintains spacing to prevent short circuits, and enables efficient space utilization. This multi-functionality reduces the need for separate components, ultimately simplifying the overall device.
Data Source
AI summary
Provided is a laminate-type all-solid state battery configured to suppress the occurrence of short circuits. Disclosed is an all-solid-state battery, wherein a width of the anode layer is larger than a width of the cathode layer; wherein the anode current collector layer comprises an anode current collector layer protrusion protruding in plane direction at any one side of the battery laminate; wherein the cathode current collector layer comprises a cathode current collector layer protrusion protruding in plane direction at any one side of the battery laminate; and wherein the battery laminate comprises side surface fixing portions composed of a resin.