Solid-State Battery Terminal Structure for Deformation Reliability
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Solution Overview
Problem
Conventional surface-mount batteries face reliability issues due to deformation caused by charge and discharge cycles or temperature changes, which affects their long-term use and ability to achieve high-rate charge/discharge characteristics and increased capacity.
Innovation Solution
A battery design featuring a complex joint structure between the battery element, first terminal, and second terminal, where the second terminal covers part of the first terminal and directly covers the battery element's end portion, providing a strong electrical connection and reducing volume changes, thereby enhancing reliability and capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional surface-mount battery structure is used, then manufacturing is simple, but reliability deteriorates due to deformation from charge/discharge cycles and temperature changes
Solution Approach 1:
The second terminal is disposed to cover at least part of the first terminal, creating a nested terminal structure where one terminal is embedded within or overlaps another terminal. This nested configuration strengthens the electrical connection between terminals and the battery element, reducing deformation during charge/discharge cycles and temperature changes, thereby improving reliability without requiring completely separate terminal components
Solution Approach 2:
The terminal structure merges the first terminal (in contact with first electrode) and second terminal (covering first terminal and battery element corner) into an integrated assembly. This merging creates a unified terminal system that provides both electrical connection and structural support, reducing overall deformation while maintaining manufacturing feasibility through combined terminal formation
2Power
If battery structure is optimized for high-rate charge/discharge, then power increases, but deformation and reliability issues worsen
Solution Approach 1:
The nested terminal configuration where the second terminal covers the first terminal provides enhanced structural support at the terminal-battery element interface. This strengthened connection accommodates the volume changes and mechanical stress generated during high-rate charge/discharge operations, preventing deformation while enabling high power delivery
Solution Approach 2:
The terminal structure utilizes different conductive materials for the first and second terminals, creating a composite terminal system. This composite construction allows optimization of each terminal's properties for both high-rate charge/discharge performance and structural stability, reducing deformation while maintaining high power capability
3Reliability
If terminal coverage is increased to reduce deformation, then reliability improves, but manufacturing complexity increases
Solution Approach 1:
The nested terminal structure allows the second terminal to be formed over the first terminal in a sequential manufacturing process. This nesting approach enables reliable connection through extended coverage while maintaining ease of manufacture by following standard layer-by-layer fabrication techniques used in conventional battery manufacturing
Solution Approach 2:
The second terminal serves multiple functions: it provides electrical connection to the battery element, structurally reinforces the terminal assembly, and covers the corner of the battery element for enhanced protection. This multi-functionality achieves improved reliability through increased coverage without proportionally increasing manufacturing complexity, as the same terminal formation process accomplishes multiple objectives
Data Source
AI summary
A battery according to a first embodiment includes: a battery element including a first electrode, a solid electrolyte layer, and a second electrode; a first terminal containing a first conductive material; and a second terminal containing a second conductive material. The first terminal is in contact with the first electrode. The second terminal covers at least part of a surface of the first terminal to be electrically connected to the first terminal and directly covers at least part of a corner of the battery element.