Battery Housing Sidewall Layout for Higher Energy Density
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Solution Overview
Problem
Conventional all-solid-state batteries face issues with reliability and reduced volumetric energy density due to insufficient protection from external forces and overlapping side walls that create non-power generating spaces, leading to potential defects and decreased capacity.
Innovation Solution
A battery design featuring a housing with non-overlapping, projecting side wall portions that protect the power generation element and prevent protrusion, reducing stress concentration and misalignment, while enhancing energy density through optimized particle packing and material contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If side wall portions of the housing overlap each other, then the power generation element is protected from external forces, but non-power generating spaces are created that reduce volumetric energy density
Solution Approach 1:
The side wall portions are designed with projecting regions that extend in the thickness direction (first direction) of the power generation element. When viewed from the side direction (second direction), the side wall portions do not overlap, but when viewed from the thickness direction (third direction), the projecting regions overlap. This dimensional approach allows the side walls to provide protective overlap without creating non-power generating spaces that would reduce volumetric energy density.
Solution Approach 2:
The side wall portions are divided into multiple regions, including a projecting region that extends in the thickness direction and a non-projecting region. This segmentation allows different portions of the side wall to serve different functions: the projecting region provides protection when viewed from the thickness direction, while the non-projecting region minimizes volume occupation when viewed from the side direction, thereby maintaining high volumetric energy density.
2Ease of manufacture
If the housing structure is simplified without projecting regions, then manufacturing is easier, but the power generation element is not adequately protected from external forces
Solution Approach 1:
The housing is designed with projecting regions that extend in the thickness direction before any external force is applied. This preliminary structural configuration ensures that when external forces act on the power generation element, the projecting regions are already in position to provide protection, preventing direct impact on the power generation element while maintaining a relatively simple manufacturing process.
3Reliability
If side wall portions extend further to provide better protection, then reliability improves, but the housing occupies more space reducing energy density
Solution Approach 1:
The side wall portions are designed with localized projecting regions that extend in the thickness direction only where needed for protection. The projecting regions are positioned specifically to provide protection when viewed from the thickness direction, while the rest of the side wall structure remains compact. This local quality approach ensures adequate protection capability without unnecessarily increasing the overall housing volume, thereby maintaining high energy density.
Data Source
AI summary
The disclosed battery includes a laminated body and a housing. The laminated body includes first and second main surfaces, and a side surface parallel to a first direction which is the laminating direction. The housing includes a first housing portion including a first plate-shaped portion facing the first main surface, and a first side wall portion facing the side surface, and a second housing portion including a second plate-shaped portion facing the second main surface, and a second side wall portion facing the side surface. The first and second side wall portions include first and second projecting regions, respectively. The first and second side wall portions do not overlap each other when viewed from a second direction perpendicular to the side surface. The first and second projecting regions at least partially overlap each other when viewed from a third direction perpendicular to the first direction and along the side surface.