Composite Copy Cell Structure for Anisotropic Battery Heat Simulation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional copy cells made of a single material fail to accurately simulate the anisotropic thermal characteristics of real battery cells, particularly in the thermal conductivity direction, due to uniform thermal conductivity in all directions, which is not representative of real battery cells.
Innovation Solution
A copy cell design featuring a cylindrical shape with a central metal region (stainless steel) surrounded by an insulating material region (plastic or urethane foam/gel) and an outer metal region, allowing for controlled thermal conductivity in the thickness direction by adjusting the thickness ratios of these regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a copy cell is made of a single material, then the manufacturing process is simple, but the thermal conductivity is uniform in all directions and cannot simulate anisotropic thermal characteristics of real battery cells
Solution Approach 1:
The copy cell employs a composite structure consisting of an inner core made of first material (e.g., aluminum alloy with high thermal conductivity) and an outer layer made of second material (e.g., plastic or urethane with low thermal conductivity). This composite construction enables the copy cell to simulate the anisotropic thermal characteristics of real battery cells, where heat conduction differs between radial and axial directions, while maintaining manufacturability through established composite manufacturing processes.
Solution Approach 2:
Different regions of the copy cell are assigned different material properties to match the local thermal characteristics of real battery cells. The inner core region uses material with high thermal conductivity to simulate the thermal behavior of battery components, while the outer layer uses material with low thermal conductivity to represent insulation layers or housing. This local differentiation of material quality enables accurate thermal simulation without requiring the entire structure to be complex.
2Temperature
If a copy cell uses metal material, then thermal conductivity is high, but the thermal conductivity in thickness direction does not match real battery cell characteristics
Solution Approach 1:
The copy cell employs a composite structure consisting of an inner core made of first material (e.g., aluminum alloy with high thermal conductivity) and an outer layer made of second material (e.g., plastic or urethane with low thermal conductivity). This composite construction enables the copy cell to simulate the anisotropic thermal characteristics of real battery cells, where heat conduction differs between radial and axial directions, while maintaining manufacturability through established composite manufacturing processes.
Solution Approach 2:
The thermal conductivity parameters of the copy cell are adjusted by changing material composition and layer thickness ratios. By controlling the thickness ratio between the inner core and outer layer, and selecting materials with appropriate thermal conductivity values, the overall thermal conductivity in the thickness direction is tuned to match real battery cell characteristics. This parameter optimization ensures accurate thermal simulation without requiring pure metal construction.
3Measurement precision
If thermal tests are conducted on real battery cells at high temperatures, then accurate thermal data can be obtained, but there is danger of ignition and safety risks
Solution Approach 1:
Instead of conducting thermal tests directly on real battery cells, a copy cell is created that replicates the thermal characteristics of the battery cell. The copy cell includes an inner core and outer layer with materials selected to match the thermal conductivity and heat capacity of actual battery components. This copying approach allows researchers to obtain accurate thermal data through high-temperature testing while eliminating the ignition risk associated with testing real battery cells.
Solution Approach 2:
The copy cell serves as an intermediary object between the researcher and the real battery cell. It mediates the thermal testing process by absorbing and conducting heat in a manner similar to the battery cell, but without the hazardous chemicals and ignition risks. The intermediary copy cell allows safe exploration of thermal behavior at extreme temperatures that would be dangerous to apply to actual battery cells.
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 design achieves thermal conductivity in the thickness direction similar to real battery cells, reducing the risk of ignition during high-temperature tests and providing a safer alternative for simulating thermal behavior.
Implementation Method 1
the first region may have a thermal conductivity of about 13 W/mK to about 18 W/mK. the second region may have a thermal conductivity of about 0.3 W/mK. a thermal conductivity in the thickness direction of the copy cell may be about 1.3 W/mK
Data Source
AI summary
A copy cell having a first region made of a first material, a second region outside the first region and made of a second material, and a third region outside the second region and made of the first material, for simulating thermal characteristics of a real battery cell.