Battery Pack Heat Dissipation Plate for Dense Cylindrical Cells
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Solution Overview
Problem
High-density secondary battery packs with multiple cylindrical cells face rapid temperature increases during high-rate discharge, leading to thermal accumulation and reduced lifespan due to ineffective heat dissipation.
Innovation Solution
A secondary battery pack design featuring a heat dissipation plate exposed through a pack case perforation, combined with a thermally conductive heat transfer pad interposed between the battery cells and the heat dissipation plate, enhances cooling efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple cylindrical battery cells are densely mounted in a small secondary battery pack, then the energy density and output are improved, but the heat dissipation efficiency deteriorates due to limited space and high cell density
Solution Approach 1:
The patent introduces a heat dissipation plate that extends in the radial direction (another dimension) of the cylindrical battery cells. Instead of only considering axial heat dissipation, the plate captures heat from the radial surface of the cells through thermal conduction, adding a new dimension to the heat dissipation pathway and effectively cooling the cells without increasing pack volume.
Solution Approach 2:
The heat dissipation plate acts as an intermediary thermal conductor between the battery cells and the external environment. It captures heat from the radial surfaces of multiple cells and transfers it to heat dissipation fins or external cooling structures, serving as a mediator that improves overall heat dissipation efficiency without requiring direct contact between all cells and external cooling systems.
2Power
If the secondary battery pack is designed with high capacity and large output, then the energy storage and power delivery are improved, but the temperature increase during high-rate discharge becomes more severe
Solution Approach 1:
The heat dissipation plate is strategically positioned to contact or approach the radial surfaces of battery cells that generate the most heat during high-rate discharge. The plate may have varying thickness, thermal conductivity distribution, or fin density to provide enhanced cooling precisely where heat generation is highest, rather than uniform cooling across all cells.
3Ease of manufacture
If conventional cooling structures are used without radial heat dissipation, then the manufacturing complexity is low, but the cooling efficiency is insufficient for high-density battery packs
Solution Approach 1:
The heat dissipation plate serves multiple functions simultaneously: it acts as a thermal conductor to capture heat from cell radial surfaces, provides structural support within the pack, and may serve as a mounting surface for electrical connections or other components. This multi-functionality improves cooling efficiency without proportionally increasing manufacturing complexity.
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 design effectively transfers heat from the battery cells to the heat dissipation plate, maximizing cooling efficiency, preventing overheating, and extending the battery pack's lifespan while reducing material costs and improving durability.
Implementation Method 1
a heat transfer pad having a thermally conductive material in a solid state and interposed between the plurality of cylindrical battery cells and the heat dissipation plate
Data Source
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AI summary
Disclosed is a secondary battery pack including a plurality of cylindrical battery cells with improved cooling efficiency. The secondary battery pack includes a plurality of cylindrical battery cells having electrode terminals formed at both ends thereof; a pack case having an accommodation portion formed to accommodate the plurality of cylindrical battery cells therein and at least one exposing portion perforated from an inside to an outside thereof; at least one heat dissipation plate configured in the form of a metal plate and located at the exposing portion of the pack case so that at least a portion thereof is exposed out through the exposing portion of the pack case; and a heat transfer pad having a thermally conductive material in a solid state and interposed between the plurality of cylindrical battery cells and the heat dissipation plate.