Solid-State Battery Case Layout for Vibration-Stable High Energy Density
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Solution Overview
Problem
Conventional lithium ion secondary batteries suffer from reduced energy density due to residual spaces for gas storage and module components outside the battery case, leading to electrode displacement during vibration.
Innovation Solution
A solid-state battery design with a battery case that matches the outer dimension of the battery cell, eliminating residual space and integrating module components within the case, and using a pressing portion to apply surface pressure, thereby suppressing electrode displacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a battery case with residual space is used to accommodate gas or electrolyte introduction, then the battery can function properly with liquid electrolyte, but the energy density is reduced
Solution Approach 1:
The patent extracts and eliminates the residual space from the battery case design. By removing the unnecessary space that was previously required for gas storage or electrolyte introduction, the battery cell can fully utilize the available volume, thereby increasing energy density while maintaining proper battery functionality through alternative sealing and pressure management mechanisms.
Solution Approach 2:
The patent changes the parameter of battery case volume by eliminating residual space. This parameter change allows the battery to achieve higher energy density by maximizing the active material volume while incorporating features like pressing portions to maintain necessary internal pressure without requiring excess space.
2Ease of manufacture
If module components are arranged outside the battery case, then the battery module can be assembled, but the overall volume increases reducing energy density
Solution Approach 1:
The patent merges the module components with the battery case structure by integrating them within the case boundaries. This combining approach allows components to be positioned in the eliminated residual space or incorporated into the case walls, reducing overall module volume and increasing energy density while maintaining ease of assembly through unified structure design.
Solution Approach 2:
The patent applies nesting by placing module components within the battery case structure itself. By nesting components inside the case rather than arranging them externally, the design maximizes space utilization and reduces the overall footprint of the battery module, thereby improving energy density without compromising assembly feasibility.
3Reliability
If residual space is maintained in the battery case, then gas can be stored or electrolyte introduced, but electrode displacement occurs during vibration
Solution Approach 1:
The patent applies preliminary action by incorporating pressing portions that pre-applied pressure to the battery cell before vibration occurs. This preliminary compression stabilizes the electrode positions and prevents displacement during vibration, while the sealed case design ensures electrolyte management is maintained without requiring residual space for gas storage.
Data Source
AI summary
Provided is a solid-state battery having a high energy density and exhibiting suppressed electrode displacement or peeling during vibration. In the present invention, a residual space in a battery cell, which is necessary for the lithium ion secondary batteries employing the liquid electrolyte is eliminated.