Cylindrical Battery Metal Layer Heat Dissipation
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Solution Overview
Problem
Cylindrical secondary batteries face issues with heat generation and stability due to high current discharge rates and external short circuits, leading to potential damage and reduced lifespan.
Innovation Solution
A cylindrical secondary battery design featuring a metal layer with an adhesive material between the electrode tab and separator, which includes a copper or aluminum foil, effectively reduces resistance and enhances heat dissipation, while maintaining the structural integrity of the jelly roll type electrode assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the resistance is lowered and the capacity is increased to achieve high output and high capacity model, then the productivity and energy density are improved, but the heat generation problem worsens due to larger current applied for longer time
Solution Approach 1:
A metal layer is introduced as an intermediary component between the electrode tab and the separator. This metal layer acts as a heat dissipation pathway, conducting away heat generated during high-rate discharge before it can affect the separator and cause thermal runaway, thus enabling high productivity without compromising safety
Solution Approach 2:
The harmful heat is extracted from the critical region by providing a dedicated heat dissipation pathway through the metal layer. This separates the heat management function from the electrical connection function, allowing the battery to operate at high discharge rates without the heat accumulating in the electrode tab region
2Temperature
If a metal layer with adhesive material is added between the electrode tab and separator to reduce resistance and enhance heat dissipation, then the heat radiation function is improved, but the device complexity increases
Solution Approach 1:
The metal layer serves multiple functions simultaneously: it provides electrical connection (low resistance), heat dissipation (thermal conduction), and structural support. By combining these functions into a single component, the design achieves improved heat radiation without proportionally increasing complexity
Solution Approach 2:
The metal layer is formed as a composite structure combining metal particles with adhesive material. This composite approach allows the layer to adhere to both the electrode tab and separator while maintaining excellent electrical and thermal conductivity, achieving multiple performance goals without requiring separate components
3Volume of stationary object
If the components are made thinner to achieve high capacity model, then the volume and weight are reduced, but the stability and resistance worsen
Solution Approach 1:
Instead of uniformly thickening all components, the metal layer is strategically placed only at the electrode tab region where heat accumulation and electrical resistance are most critical. This localized approach maintains the overall thin design for high energy density while providing enhanced stability and heat management where needed
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 reduces heat concentration and improves the stability and lifespan of the battery by effectively diffusing heat generated during high current applications and preventing internal stress-induced structural release.
Implementation Method 1
a metal layer disposed between the electrode tab and the separator may include an adhesive material... effectively diffusing heat generated during high current applications
Implementation Method 2
a metal layer disposed between the electrode tab and the separator may include an adhesive material... The tab body and the metal layer are combined by the adhesive material
Data Source
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AI summary
A cylindrical type secondary battery according to an embodiment of the present invention includes an electrode assembly including a negative electrode sheet, a positive electrode sheet, and a separator, wherein the separator may be disposed at an outermost side of the electrode assembly, an electrode tab disposed further inside than the separator may be attached to one of the negative electrode sheet and the positive electrode sheet, and a metal layer disposed between the electrode tab and the separator may include an adhesive material.