Solid-State Battery Convex Electrode Structure for Dense Mounting
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Solution Overview
Problem
Conventional solid state batteries face issues with short-circuiting and require a large solder printing amount due to their size, making high-density mounting with minimal components challenging.
Innovation Solution
A laminated solid state battery design with external electrodes covering end surfaces and convex parts on principal surfaces, reducing solder printing needs and enhancing mechanical strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the solid state battery is made larger to secure battery capacity, then the battery capacity is improved, but the solder printing amount increases causing short-circuiting with adjacent components
Solution Approach 1:
The patent introduces convex parts that protrude from the principal surfaces of the battery, utilizing the third dimension (height) to provide mechanical support and stress distribution. This allows the battery to maintain adequate capacity in the planar dimensions while using vertical protrusions to prevent short-circuiting and reduce solder printing requirements.
Solution Approach 2:
The convex parts are strategically positioned at specific locations on the battery surface where mechanical stress concentrates. These localized structural features provide targeted reinforcement and stress distribution without requiring the entire battery structure to be larger or use more solder, thus preventing short-circuiting while maintaining compact size.
2Reliability
If the solder layer thickness is increased to ensure electrical connection, then the electrical connection reliability is improved, but the solder printing amount increases causing short-circuiting with adjacent components
Solution Approach 1:
The convex parts extend in the vertical dimension from the battery's principal surfaces, providing mechanical support and stress distribution that reduces the reliance on thick solder layers. This three-dimensional structure allows for thinner solder printing while maintaining reliable electrical connections and preventing short-circuiting with adjacent components.
3Volume of moving object
If the battery is mounted on a board with minimal components, then the device miniaturization is improved, but the mechanical stress concentration increases causing cracking
Solution Approach 1:
The convex parts protruding from the battery surfaces utilize the vertical dimension to provide mechanical reinforcement. These three-dimensional features distribute mechanical stress that would otherwise concentrate on the flat battery surfaces, preventing cracking while allowing the overall device to maintain a miniaturized form factor.
Solution Approach 2:
The convex parts are pre-formed structural features that provide stress distribution and mechanical protection before any external stress is applied during mounting or operation. This beforehand cushioning prevents stress concentration and potential cracking in the miniaturized device structure.
4Reliability
If the battery element body is covered with a protective layer, then the protection against dust and damage is improved, but the manufacturing complexity increases
Solution Approach 1:
The protective layer is integrated with the battery element body structure, forming a unified component rather than a separate assembly step. This merging of the protective function into the existing battery structure provides dust and damage protection while minimizing additional manufacturing complexity.
Data Source
AI summary
A solid state battery that includes: a battery element body; a first external electrode on a first end surface of the battery element body; a second external electrode on a second end surface of the battery element body; and a protective layer covering a peripheral surface of the battery element body that connects the first and second end surfaces. The first external electrode covers a first end surface of the solid state battery, and the second external electrode covers a second end surface of the solid state battery. The first principal surface and the second principal surface have a pair of a first convex part and second convex part extending from the first external electrode to the second external electrode along a longitudinal direction and located at opposed end parts in a transverse direction.