All-Solid Battery Stack Pressure Control With Metal Wave Springs
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Solution Overview
Problem
The development of all-solid rechargeable batteries is necessary due to the risk of explosions associated with batteries using liquid electrolytes.
Innovation Solution
The design includes an all-solid cell stack with a plurality of all-solid unit cells, a case, and metal wave springs to ensure uniform pressure and stability over a wide temperature range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If metal wave springs are added to the battery structure, then impact resistance is improved, but device complexity increases
Solution Approach 1:
The battery structure is segmented by dividing the pressing mechanism into multiple independent metal wave springs distributed across the end plate, rather than using a single complex pressing structure. This segmentation allows each spring to independently absorb impact forces while maintaining overall structural simplicity.
Solution Approach 2:
The metal wave springs utilize elastic deformation parameter changes to absorb impact energy. The springs are designed with specific wave patterns that allow controlled deformation under impact loads, transforming mechanical impact energy into elastic potential energy and thereby improving impact resistance without adding complex active control mechanisms.
2Reliability
If multiple end plates and wave springs are used to maintain uniform pressure, then reliability is improved, but device complexity increases
Solution Approach 1:
The end plates serve multiple functions: they provide structural support, distribute pressure uniformly across the cell stack, and act as mounting surfaces for the metal wave springs. This multi-functionality reduces the need for additional dedicated components, maintaining reliability while limiting complexity increase.
Solution Approach 2:
The metal wave springs automatically adjust and maintain uniform pressure distribution across the battery cells through their elastic properties. The springs self-regulate pressure based on cell expansion/contraction during charge-discharge cycles, eliminating the need for external control mechanisms and maintaining reliability with minimal added complexity.
3Reliability
If solid electrolyte is used instead of liquid electrolyte, then safety is improved, but ionic conductivity decreases
Solution Approach 1:
The solid electrolyte is designed as a composite material combining ceramic particles (for high ionic conductivity and safety) with a polymer binder (for flexibility and processability). This composite structure achieves both improved safety from the solid state and maintained ionic conductivity through optimized particle distribution and binder selection.
Solution Approach 2:
The solid electrolyte composition parameters are optimized by adjusting the ratio of ceramic to polymer components, controlling particle size distribution, and modifying sintering conditions. These parameter changes enable the solid electrolyte to achieve ionic conductivity levels comparable to liquid electrolytes while maintaining the safety advantages of the solid state.
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 improves impact resistance, reduces overall thickness, and enhances energy density compared to traditional batteries, while maintaining safety by eliminating liquid electrolytes.
Implementation Method 1
a plurality of first metal wave springs between the first end plate and the case
Data Source
AI summary
An all-solid rechargeable battery includes an all-solid cell stack including a plurality of all-solid unit cells stacked in a first direction; a case accommodating the all-solid cell stack therein; a first end plate between the first end portion of the all-solid cell stack in the first direction and the case; and a plurality of first metal wave springs between the first end plate and the case.