Laminate Battery Case Heat Dissipation via Sealing Part
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Solution Overview
Problem
Lithium battery cells face significant heat dissipation challenges, particularly in stacked battery modules, where heat accumulation leads to deterioration and safety issues, especially in high-power applications like electric vehicles, due to the low heat conductivity of polymer materials used in pouch-shaped battery cases.
Innovation Solution
A battery cell structure is developed with a laminate sheet battery case that includes a resin layer and a metal layer, featuring an extending sealing part or a thermally conductive member coupled to the sealing part, allowing for efficient heat conduction and dissipation outside the cell, even when electrode terminals are not present, thereby maximizing heat dissipation efficiency without increasing thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a pouch-shaped battery case made of polymer material is used, then the battery cell achieves a compact form factor and ease of manufacture, but the heat dissipation performance deteriorates due to low heat conductivity
Solution Approach 1:
The battery case is constructed as a laminate structure combining a polymer layer and a metal layer. The polymer layer provides flexibility and ease of manufacture, while the metal layer provides high heat conductivity for effective heat dissipation. This composite material approach resolves the contradiction between ease of manufacture and heat dissipation performance.
2Temperature
If the battery case is made thicker to improve heat dissipation, then the heat conduction capability is enhanced, but the compact form factor is compromised
Solution Approach 1:
By using a metal layer with high heat conductivity in the laminate structure, effective heat dissipation is achieved without increasing the overall thickness of the battery case. The metal layer provides superior thermal conduction properties in a thin configuration, resolving the contradiction between heat conduction capability and thickness.
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 structure effectively dissipates heat generated during charge and discharge, enhancing the safety and lifespan of lithium battery cells while maintaining a compact form factor, suitable for both small-sized devices and large-scale battery modules.
Implementation Method 1
a battery cell constructed in a structure to accelerate heat dissipation by heat conduction through at least some of a sealing part of the battery case where the electrode terminals are not located
Data Source
AI summary
Disclosed herein is a battery cell constructed in a structure in which an electrode assembly of a cathode/separator/anode structure is mounted in a battery case formed of a laminate sheet including a resin layer and a metal layer while the electrode assembly is connected to electrode terminals extruding out of the battery case, wherein the battery cell is constructed in a structure to accelerate heat dissipation by the heat conduction through at least some of a sealing part of the battery case where the electrode terminals are not located.