Fluid Pressurization Chamber for Stable All-Solid-State Battery Cells
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Solution Overview
Problem
All-solid-state batteries face challenges in maintaining constant pressure across cells due to volume changes during charging and discharging, leading to performance deterioration and uneven pressure distribution, especially in anodeless-type batteries where volume differences are significant.
Innovation Solution
An all-solid-state battery system with a pressurization chamber filled with a pressurizing fluid, controlled by a state detector and controller to maintain pressure within a set range, ensuring uniform pressure application across cells through the supply and discharge of the fluid based on charging and discharging states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a fixed pressure is applied to the cell stack using a conventional pressing jig, then the structure is simple and easy to manufacture, but the pressure applied to the cell changes greatly during charging and discharging due to volume changes, leading to performance deterioration
Solution Approach 1:
The pressing jig is designed with movable pressing plates that can dynamically adjust their position along the pressing direction. The pressing plates are guided by guide rails and can move independently to accommodate volume changes of cells during charging and discharging, while maintaining constant pressure through elastic pressing members
Solution Approach 2:
The elastic pressing members (springs or elastomers) change their elastic deformation parameters in response to cell volume changes. When cells expand during charging, the pressing plates move, compressing the elastic members further; when cells contract during discharging, the pressing plates retract, allowing elastic members to expand. This parameter change maintains constant pressing force throughout the cycle
2Device complexity
If a fixed pressure is applied to the cell stack, then the device complexity is low, but the pressure distribution across cells becomes uneven during charging and discharging, causing performance deterioration
Solution Approach 1:
The pressing system is segmented into multiple independent pressing plates (first and second pressing plates) that can move independently along guide rails. Each pressing plate applies pressure to opposite sides of the cell stack, ensuring uniform pressure distribution across all cells. The segmentation allows each plate to independently accommodate local volume changes while maintaining overall pressure uniformity
Solution Approach 2:
Elastic pressing members act as intermediaries between the movable pressing plates and the cell stack. These elastic members distribute the pressing force uniformly across the cell surfaces and accommodate volume changes through elastic deformation, ensuring that pressure remains uniform across all cells during charging and discharging cycles
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 solution maintains constant and uniform pressure across all-solid-state battery cells, improving performance by stabilizing pressure despite volume changes during charging and discharging, particularly beneficial for anodeless-type batteries.
Implementation Method 1
a pressurizing device configured to control the pressure applied to the plurality of cells by the pressurizing fluid according to the control signal outputted by the controller
Data Source
AI summary
An all-solid-state battery system is disclosed, the system comprising an all-solid-state battery comprising a plurality of cells arranged in a closed inner space of a pressurization chamber and a pressurizing fluid filled in the closed inner space of the pressurization chamber, a state detector configured to detect state information of the all-solid-state battery, a controller configured to output a control signal configured for controlling a pressure applied to the plurality of cells by the pressurizing fluid in the inner space of the pressurization chamber based on the state information of the all-solid-state battery detected by the state detector, and a pressurizing device configured to control the pressure applied to the plurality of cells by the pressurizing fluid according to the control signal outputted by the controller.