Slit Elliptical Battery Holder for Cylindrical Cell Contact
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Solution Overview
Problem
Cylindrical batteries with minimum dimensional tolerance may not be appropriately accommodated in battery holders due to reduced close contact property, leading to potential misalignment and reduced heat transfer efficiency.
Innovation Solution
The battery pack design includes elliptical cylindrical accommodating portions with slits parallel to the central axis, allowing elastic deformation to ensure the wall portions closely contact the battery cells, maintaining alignment and improving heat transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the battery storage portion is made rigid to maintain structural stability, then the structural stability is improved, but the close contact property with cylindrical batteries of minimum dimensional tolerance is reduced
Solution Approach 1:
The battery storage portion is divided into a rigid outer frame structure and a flexible inner wall portion. The rigid frame maintains overall structural stability, while the flexible inner wall can deform to accommodate dimensional variations in cylindrical batteries, ensuring reliable close contact.
Solution Approach 2:
Different parts of the battery storage portion have different rigidity properties. The outer frame is made rigid for structural support, while the inner wall portion is made flexible to adapt to battery dimensional tolerances. This local differentiation of mechanical properties resolves the contradiction between structural stability and close contact reliability.
2Adaptability or versatility
If the battery storage portion deforms to expand diameter for maximum tolerance batteries, then the adaptability is improved, but the structural stability deteriorates
Solution Approach 1:
The battery storage portion is segmented into a rigid outer frame and a flexible inner wall. The flexible inner wall can deform to accommodate batteries with maximum dimensional tolerance, while the rigid outer frame maintains structural stability during this deformation process.
Solution Approach 2:
The inner wall of the battery storage portion is designed as a flexible component that can elastically deform to expand its diameter. This flexible shell allows the storage portion to adapt to cylindrical batteries with maximum dimensional tolerance while the rigid outer frame prevents excessive deformation that would compromise structural stability.
3Ease of manufacture
If the wall portion is made thin to allow elastic deformation, then the ease of manufacture is improved, but the strength deteriorates
Solution Approach 1:
The wall portion is segmented into thin, flexible segments that can easily deform. These thin segments are arranged in a configuration where their collective strength is sufficient while individually they remain flexible enough for easy manufacturing and deformation.
Solution Approach 2:
The thickness parameter of the wall portion is optimized to balance flexibility and strength. The wall is made thin enough to allow elastic deformation during battery insertion but maintains sufficient strength through material selection and structural design to prevent failure during normal operation.
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
Enhances close contact and alignment of cylindrical batteries, facilitating efficient heat dissipation and electrical connection while preventing deformation of the battery case.
Implementation Method 1
each of the accommodating portions has a wall portion defining a space for accommodating the cylindrical battery cell, the wall portion in a state before accommodating the cylindrical battery cell defines an elliptical cylindrical space
Data Source
AI summary
A battery pack is provided and including a battery case including a plurality of accommodating portions each accommodating one cylindrical battery cell, the accommodating portions being arranged side by side in one direction, in which each of the accommodating portions has a wall portion defining a space for accommodating the cylindrical battery cell, the wall portion in a state before accommodating the cylindrical battery cell defines an elliptical cylindrical space, a slit is provided in the wall portion in parallel with a central axis of the elliptical cylindrical space, a direction in which the accommodating portions are arranged in one direction is defined as a long axis direction of the elliptical cylindrical space, a direction perpendicular to the long axis direction is defined as a short axis direction, and a direction perpendicular to the long axis direction and the short axis direction and parallel to the central axis of the elliptical cylindrical space is defined as a depth direction, and a longest short axis diameter in the short axis direction of the elliptical cylindrical space in each of the accommodating portions is equal to or smaller than a diameter of the cylindrical battery cell.