Cell Holder Disc Spring Mechanism for Solid-State Battery Pressure Control
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Solution Overview
Problem
All-solid-state batteries face challenges in finely controlling pressure due to physical pressurization and volume changes during charge or discharge reactions, leading to fluctuations in battery characteristics, especially in low pressurized areas.
Innovation Solution
A cell holder with a pressing portion incorporating disc springs that can finely control pressure by displacing to maintain a constant set pressure, combined with a spherical member and swingable plate member to ensure stable contact and prevent uneven pressure distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If physical pressurization is applied to reduce electric resistivity and improve battery performance, then battery performance is improved, but the contact state at the interface changes due to volume contraction or expansion during charge/discharge reactions, causing battery characteristics to fluctuate
Solution Approach 1:
The pressing portion is designed to be movable in the vertical direction, allowing it to dynamically adjust its position in response to volume changes of the battery cell during charge/discharge reactions. This dynamic adjustment maintains constant contact pressure at the interface between electrodes and electrolyte, preventing fluctuations in battery characteristics while preserving improved performance.
Solution Approach 2:
The system employs feedback control where the movable pressing portion responds to volume changes of the battery cell by adjusting its position accordingly. This feedback mechanism ensures that the contact state at the interface is continuously maintained at an optimal level, resolving the contradiction between maintaining improved performance and stabilizing the contact state.
2Stress or pressure
If pressure is applied to the battery cell, then electric resistivity is reduced, but it is difficult to finely control the pressure in low pressurized areas
Solution Approach 1:
The movable pressing portion enables fine control of pressure in low pressurized areas by dynamically adjusting its position. This dynamic adjustment allows for precise control of the contact pressure between electrodes and electrolyte, achieving the necessary pressure control precision that was previously difficult to obtain.
3Device complexity
If the pressing portion is fixed, then the structure is simple, but the followability with respect to volume change of the solid-state battery cell is poor
Solution Approach 1:
The pressing portion is designed to be movable in the vertical direction, allowing it to follow volume changes of the battery cell during operation. This dynamic capability significantly improves adaptability to volume changes while adding only minimal structural complexity, as the movable design can be implemented with straightforward mechanical guidance.
Solution Approach 2:
The cell holder is divided into a fixed lower portion and a movable pressing portion. This segmentation allows the pressing portion to independently move and adapt to volume changes, improving followability while keeping the overall structure relatively simple through clear functional separation.
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
The solution allows for stable and consistent battery characteristics by maintaining predetermined pressure despite volume changes, improving space efficiency and enabling the use of multiple battery cells in a compact module, suitable for both solid-state and liquid-based lithium ion batteries.
Implementation Method 1
a pressing portion (e.g., the pressing portion 10 described later) which is supported by the cell holder body and includes a disc spring (e.g., the disc spring 11 described later) being in contact with a first end face (e.g., the lower face 901 described later) of the secondary battery cell in a first direction and pressing the first end face of the secondary battery cell in a second direction opposite to the first direction
Data Source
AI summary
A cell holder (1) for holding a secondary battery cell (9) including a positive electrode active material, a negative electrode active material, and an electrolyte which is disposed between the positive electrode active material and the negative electrode active material and is in contact with both the positive electrode active material and the negative electrode active material, and for outputting power from the secondary battery cell (9), includes a cell holder body (30), and a pressing portion (10) which is supported by the cell holder body (30) and includes a disc spring (11) being in contact with a first end face of the secondary battery cell (9) in a first direction and pressing the first end face of the secondary battery cell (9) in a second direction opposite to the first direction.