Solid-State Battery Electrode Layout for Mounting and Gas Sealing
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Solution Overview
Problem
Solid-state batteries in the related art suffer from inferior mountability due to stress concentration at connection points between extraction wirings and are prone to gas leakage, which leads to connection failures and inadequate gas barrier properties.
Innovation Solution
The design includes lower surface electrodes connected to end surface electrodes on the lower surface of the battery, with a coating layer comprising barrier, buffer, and impact resistant layers to prevent gas infiltration and improve mountability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If linear extraction wirings are used to extract power from the solid-state battery, then the battery structure is simplified, but stress concentrates on the connection portions between the extraction wirings and the end surface electrodes, causing connection failure
Solution Approach 1:
The power extraction function is segmented into two separate components: end surface electrodes on the side surface and lower surface electrodes on the lower surface. This segmentation distributes the electrical connection points across different surfaces, eliminating stress concentration at single connection portions and preventing connection failure while maintaining structural simplicity.
2Device complexity
If extraction wirings are led out in a substantially horizontal direction, then the battery design is simplified, but the forming direction of the extraction wiring differs from the mounting direction, causing connection failure between the solid-state battery and the substrate
Solution Approach 1:
Instead of leading extraction wirings out horizontally from the side surface, the invention inverts the approach by placing electrodes directly on the lower surface. This directional inversion aligns the power extraction direction with the mounting direction, enabling reliable connection to substrates while simplifying the overall design.
3Object-affected harmful factors
If a waterproof layer is provided on the solid-state battery, then some protection is offered, but gas such as water vapor can still infiltrate through the extraction wirings that penetrate the waterproof layer
Solution Approach 1:
The invention transitions from a single-dimension waterproofing approach (waterproof layer on outer surface) to a multi-dimensional solution by placing electrodes on the lower surface. This dimensional change allows the electrodes to be positioned where they do not penetrate the waterproof layer, maintaining gas barrier properties while providing electrical connection.
Data Source
AI summary
A solid-state battery that includes: a solid-state battery main portion having a positive electrode layer and a negative electrode layer alternatively stacked with a solid electrolyte layer interposed therebetween; a first end surface electrode electrically connected to the positive electrode layer and disposed on a first side surface of the solid-state battery main portion; a second end surface electrode electrically connected to the negative electrode layer and disposed on a second side surface of the solid-state battery main portion; a first lower surface electrode electrically connected to the first end surface electrode and disposed on a lower surface side of the solid-state battery main portion; and a second lower surface electrode electrically connected to the second end surface electrode and disposed on the lower surface side of the solid-state battery main portion.