Battery Pack Accommodating Panel for Thermal Propagation Isolation
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Solution Overview
Problem
Existing battery packs face challenges in preventing thermal propagation from a fire in one battery module to adjacent modules, which can lead to unsafe conditions such as fires or explosions.
Innovation Solution
The battery pack incorporates a design with varying thermal conductivity or thermal resistance values depending on the position, featuring a heat resistance portion on the accommodating panel that prevents heat conduction between battery modules, and includes a mechanism to separate overheated modules to mitigate thermal runaway.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a uniform accommodating panel is used to support battery modules, then the structure is simple and easy to manufacture, but heat can conduct freely between adjacent battery modules causing thermal propagation
Solution Approach 1:
The accommodating panel is designed with non-uniform thermal conductivity by incorporating heat resistance portions at specific locations between battery modules. These portions have different thermal properties than the surrounding panel areas, creating local thermal barriers that prevent heat propagation while maintaining overall structural simplicity.
Solution Approach 2:
The accommodating panel is segmented into different functional regions: heat-conducting areas that provide structural support and heat dissipation, and heat resistance portions that act as thermal barriers. This segmentation allows the panel to perform multiple thermal functions simultaneously without requiring completely separate components.
2Reliability
If thermal barriers are added between all battery modules to prevent heat conduction, then thermal propagation is prevented, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
Instead of adding thermal barriers throughout the entire panel, heat resistance portions are strategically placed only at specific locations where thermal propagation risk is highest. This localized approach provides effective thermal protection while minimizing the complexity of panel fabrication.
Solution Approach 2:
The thermal conductivity parameter of the accommodating panel is varied spatially by incorporating heat resistance portions with different material properties or structural characteristics. This allows the panel to have high thermal conductivity in support areas and low thermal conductivity in barrier areas, achieving thermal protection without uniform complexity throughout.
3Temperature
If the accommodating panel has high thermal conductivity to dissipate heat, then cooling efficiency is improved, but thermal propagation between modules increases
Solution Approach 1:
The accommodating panel exhibits different thermal conductivity characteristics in different regions: areas in contact with battery modules have high thermal conductivity for efficient heat dissipation, while heat resistance portions between modules have low thermal conductivity to prevent thermal propagation. This local differentiation resolves the contradiction between cooling efficiency and thermal isolation.
Solution Approach 2:
The thermal management function is segmented into two distinct pathways: vertical heat dissipation paths through high-conductivity panel regions that conduct heat away from individual modules, and horizontal thermal barriers through low-conductivity heat resistance portions that block heat transfer between adjacent modules. This segmentation allows simultaneous achievement of both cooling efficiency and thermal isolation.
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 effectively reduces the risk of thermal propagation between battery modules, allowing for the safe isolation of overheated modules and preventing the spread of thermal runaway, thereby enhancing the safety and reliability of the battery pack.
Implementation Method 1
a heat resistance portion which is connected to at least a part of the first bottom surface and which prevents or mitigates conduction of heat generated from any one of the battery modules to another adjacent battery module
Data Source
Figure 1A~1C
Figure 2
Figure 3A~3B
AI summary
A battery pack is disclosed. In some embodiments of the disclosed technology, a battery pack including: one or more battery modules, each battery module including: one or more battery cells; and a module case accommodating the one or more battery cells therein and a base panel forming a lower surface of the module case; and an accommodating panel forming a bottom surface of a module accommodating space for accommodating the one or more battery modules, wherein the accommodating panel includes: a first bottom surface positioned to face each of the base panels; and a second bottom surface including a heat resistance portion which is connected to at least a part of the first bottom surface and configured to reduce conduction of heat generated from any one of the battery modules to another adjacent battery module through the first bottom surface.