Buffer Plate With Deformable Section For Power Storage Device
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Solution Overview
Problem
Power storage devices face challenges in maintaining stability of secondary cells due to volume changes during charging and discharging, leading to increased pressure and degraded cycle characteristics.
Innovation Solution
The power storage device incorporates buffer plates with non-deformable and deformable sections, where the deformable section is thicker and fitted into a through hole or recessed portion of the non-deformable section, allowing for volume change absorption and maintaining constant inter-cell distance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the secondary cells are tightly bound to maintain stability, then the resistance against vibration is improved, but the reactive force generated by expansion during charging increases and degrades cycle characteristics
Solution Approach 1:
The buffer plate is divided into a non-deformable section and a deformable section with different mechanical properties. The non-deformable section provides rigid support to maintain cell stability and resist vibration, while the deformable section allows controlled deformation to absorb expansion forces during charging, thereby resolving the contradiction between stability and reactive force reduction
Solution Approach 2:
The buffer plate structure is segmented into distinct functional zones: a non-deformable section for structural support and a deformable section for volume change accommodation. This segmentation allows each section to perform its specific function independently, enabling the system to simultaneously achieve stability and reduce expansion stress
2Duration of action of stationary object
If the binding force is reduced to allow volume change, then the cycle characteristics are improved, but the resistance against vibration deteriorates
Solution Approach 1:
Different sections of the buffer plate have different deformation characteristics tailored to specific functions. The non-deformable section maintains rigid binding to prevent vibration and maintain structural integrity, while the deformable section provides compliant accommodation for volume changes during cycling, thus improving cycle characteristics without sacrificing vibration resistance
Solution Approach 2:
The buffer plate is segmented into rigid and compliant zones that work together to simultaneously achieve vibration resistance and cycle life improvement. The rigid non-deformable section prevents excessive movement and vibration, while the compliant deformable section allows necessary volume expansion and contraction during charging and discharging cycles
3Stability of the object's composition
If the buffer plate is made completely deformable to accommodate volume change, then the stability during charging is improved, but the inter-cell distance increases and device size enlarges
Solution Approach 1:
The buffer plate incorporates a deformable section specifically positioned and sized to accommodate volume changes during charging, while the non-deformable section maintains compact inter-cell spacing. This localized deformability provides necessary charging stability without requiring overall buffer plate expansion, thereby minimizing device size
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 resistance against vibration at low state of charge and suppresses reactive forces at high state of charge, enhancing stability and cycle characteristics while minimizing inter-cell distance and device size.
Implementation Method 1
a deformable section that allows a volume change in the secondary cell caused by charging and discharging is formed in a contact surface of the buffer plate
Data Source
AI summary
The power storage device is provided with a cell stack body formed by alternately arranging a plurality of secondary cells and a plurality of buffer plates. Each of the buffer plates has a non-deformable section and a deformable section that is elastically deformed according to a volume change in the secondary cell. The non-deformable section has a through hole in which the deformable section is fitted. The deformable section is formed thicker than the non-deformable section.