Battery Cell Thermal Conductive Sheet Sealing Part
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Solution Overview
Problem
Lithium secondary batteries face challenges in heat dissipation, 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-coated laminate battery cases.
Innovation Solution
A battery cell structure featuring a thermally conductive sheet extending to the sealing part of the battery case, which is thermally welded, and partially covering the cell to enhance heat dissipation without increasing the cell's thickness, using materials like metal or carbon plates with high heat conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a laminate battery case with polymer coating is used, then durability and protection are improved, but heat dissipation capability deteriorates
Solution Approach 1:
The battery case uses a composite structure combining polymer layers for durability and metal layers for thermal conductivity. Specifically, the laminate sheet includes an inner resin layer, isolation metal layer, outer resin layer, and heat dissipation metal layer, creating a composite material that simultaneously provides protection and heat dissipation.
Solution Approach 2:
The laminate battery case structure serves multiple functions: the polymer layers provide durability and protection while the metal layers provide thermal conductivity. This multi-functional design eliminates the need for separate heat dissipation components while maintaining case integrity.
2Quantity of substance
If battery cells are stacked to increase capacity, then energy density is improved, but heat accumulation worsens
Solution Approach 1:
The heat dissipation metal layer is extracted as a dedicated functional component within the laminate structure, specifically positioned to conduct heat away from the battery cells. This extracted thermal management function addresses heat accumulation issues in stacked configurations.
Solution Approach 2:
The laminate battery case acts as an intermediary thermal management component between the battery cells and the external environment. The metal layers within the laminate serve as thermal mediators, conducting heat from the cells through the case structure to external heat sinks.
3Ease of manufacture
If the battery case structure is simplified, then manufacturing complexity is reduced, but heat dissipation efficiency deteriorates
Solution Approach 1:
The heat dissipation function is merged into the battery case structure itself through the laminate construction. The case is not merely a protective shell but an integrated thermal management component, combining structural and thermal functions in a single manufactured part.
Solution Approach 2:
The laminate structure combines different materials (resin and metal layers) with distinct properties in a single composite component. This allows the battery case to simultaneously provide mechanical protection and thermal conduction without requiring separate components or complex assembly processes.
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 effectively maximizes heat dissipation efficiency, preventing heat accumulation and ensuring the safety and longevity of battery cells, even in compact, high-capacity modules, without requiring additional heat exchange members or complex manufacturing processes.
Implementation Method 1
a sheet-type member (a thermally conductive sheet) to accelerate the dissipation of heat from the battery cell
Implementation Method 2
a sealing part formed by thermally welding upper and lower parts of the laminate sheet
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 case is provided at an outer circumferential end thereof with a sealing part formed by thermally welding upper and lower parts of the laminate sheet, and a sheet-type member (‘a thermally conductive sheet’) to accelerate the dissipation of heat from the battery cell extends to the sealing part while the thermally conductive sheet partially covers the battery cell.