Battery Stack Restraining Member with Segmented Elastic Bodies
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Solution Overview
Problem
Battery modules with lithium ion secondary batteries face challenges in managing volume expansion and shrinkage, which can lead to dimensional errors and excessive material alteration, requiring a restraining structure that balances large and small dimensional displacements.
Innovation Solution
A battery module with a displacement adjustment member comprising first and second elastic bodies, allowing controlled elastic deformation to manage volume expansion and shrinkage, featuring a high displacement region for initial expansion and a low displacement region to prevent material alteration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the restraining member exhibits large dimensional displacement to offset volume expansion/shrinkage and thickness error, then the adaptability to dimensional variations is improved, but the risk of excessive expansion/shrinkage causing material alteration increases
Solution Approach 1:
The displacement adjustment member is divided into multiple elastic bodies (first elastic body, second elastic body, and third elastic body) with different stiffness characteristics. Each elastic body segment handles a specific range of displacement, allowing the system to adapt to various dimensional variations while preventing excessive displacement that could cause material alteration.
Solution Approach 2:
Different regions of the displacement adjustment member have different elastic properties. The first elastic body has larger elastic deformation extent for initial expansion, while the second and third elastic bodies have smaller elastic deformation extents for controlling excessive expansion. This local differentiation in elastic properties allows the system to provide appropriate restraint at different displacement stages.
2Device complexity
If a single elastic body is used in the displacement adjustment member, then the device complexity is reduced, but the ability to control restraining load across different expansion stages is insufficient
Solution Approach 1:
The displacement adjustment member is segmented into multiple elastic bodies with different stiffness characteristics. The first elastic body handles initial expansion with larger deformation, while the second and third elastic bodies control subsequent expansion stages with smaller deformation. This segmentation enables precise restraining load control across different expansion stages while maintaining a relatively simple overall structure.
Solution Approach 2:
The displacement adjustment member uses a composite structure of multiple elastic bodies made from materials or configurations with different elastic moduli. This composite approach allows the system to exhibit non-linear elastic characteristics, providing appropriate restraining load at different displacement stages without requiring complex active control mechanisms.
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 effectively balances large and small dimensional displacements, ensuring stable battery performance by controlling the restraining load through elastic deformation of different elastic bodies, thereby preventing material alteration and maintaining battery integrity.
Implementation Method 1
the restraining load on the stack in the stacking direction is controlled through elastic deformation of the first elastic body when the stack expands from the reference length X0 up to a first length X1
Implementation Method 2
the restraining load on the stack in the stacking direction is controlled through elastic deformation of the second elastic body when the stack further expands from X1 up to a second length X2
Data Source
AI summary
A displacement adjustment member provided in a battery module disclosed herein has at least a first elastic body and a second elastic body capable of undergoing elastic deformation in the stacking direction of unit cells. The first elastic body is made of an elastic body in which an elastic deformation extent, with respect to a predetermined load, is relatively larger than that of the second elastic body.