Solid-State Battery Current Collection for Thickness Variation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing all-solid-state batteries face challenges in achieving high reliability in electrical connection due to variations in thickness and height of the power generation element, which affect internal resistance and overall performance.
Innovation Solution
The battery design incorporates a porous metal layer embedded in the electrode mixture layers and an elastic conductive member to press the power generation element, combined with a conductive plate to restrain movement, ensuring stable electrical connection and reduced internal resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a power generation element is sealed in a case without additional current-collecting structures, then the device complexity is reduced, but the reliability of electrical connection deteriorates due to variations in thickness and height of the power generation element
Solution Approach 1:
The current-collecting structure is merged with the case by forming a conductive path that integrates the bottom and side wall of the case into a unified current-collecting component. This eliminates the need for separate current-collecting structures while maintaining reliable electrical connection, thus resolving the contradiction between reliability and device complexity.
Solution Approach 2:
The case serves multiple functions: it provides mechanical housing for the power generation element and simultaneously acts as a current-collecting structure through the integrated conductive path. This multi-functionality reduces the number of additional components needed while ensuring reliable electrical connection despite variations in power generation element dimensions.
2Reliability
If the power generation element thickness and height are tightly controlled to maintain consistent contact area, then the electrical connection reliability is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The conductive path is designed to accommodate dimensional variations in the power generation element through its configuration along the inner surface of the case. The path can adapt to different thickness and height values while maintaining continuous electrical contact, thus improving reliability without imposing stringent manufacturing precision requirements.
Solution Approach 2:
Instead of controlling the power generation element dimensions within tight tolerances, the invention changes the approach by designing the conductive path geometry to accommodate a range of dimensional parameters. This allows manufacturing with relaxed precision while maintaining reliable electrical connection.
3Reliability
If elastic conductive members are added to press the power generation element, then the electrical connection reliability is improved, but the device complexity and number of components increase
Solution Approach 1:
The pressing function and current-collecting function are merged into the case structure itself. The conductive path formed along the inner surface of the bottom and side wall provides both mechanical contact pressure and electrical conduction, eliminating the need for separate elastic conductive members while achieving reliable electrical connection.
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
This configuration enhances the reliability of electrical connections by minimizing internal resistance variations and maintaining consistent contact areas, thereby improving the overall performance and capacity of the all-solid-state battery.
Implementation Method 1
an elastic conductive member to press the power generation element
Implementation Method 2
a first porous metal layer... electrically connected to a first conductive path
Data Source
AI summary
The all-solid-state battery includes: a case including a recessed container and a cap covering the opening of the recessed container; a power generation element contained in the case and including an electrode layer, an electrode layer and a solid electrolyte layer stacked upon one another; and an elastic conductive member located between the power generation element and the inner bottom surface of the recessed container. The elastic conductive member, together with the power generation element, is pushed into the recessed container to be contained therein. The electrode layer includes an electrode mixture layer and a porous metal layer. The elastic conductive member contacts the porous metal layer and, by means of its elastic force, presses the power generation element toward the cap. The all-solid-state battery of the present invention is relevant to Goals and of the SDGs.