Sealed Cell Case with High Emissivity Coatings for Thermal Management
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Solution Overview
Problem
Cell cases with sealed structures face thermal degradation and capacity loss due to heat absorption during non-power generation, even when radiation performance is improved for power generation, as the cell temperature rises with high outside air temperatures.
Innovation Solution
A sealed cell case with a supporting mechanism forming a space between its outer and inner surfaces, featuring a first cover layer with higher thermal radiation emissivity on the outer surface of the battery module and a second cover layer with higher emissivity on the inner surface of the cell case, opposed through this space, to enhance heat dissipation during power generation and reduce heat absorption during non-use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the cell case is made with sealed structure to ensure insulating properties, then the sealing performance is improved, but thermal degradation and capacity loss occur due to heat accumulation inside the case
Solution Approach 1:
The cell case is divided into multiple functional layers: an outer case, an insulating layer, and an inner case. This segmentation allows the insulating layer to block external heat while the inner case accommodates the cell module, resolving the contradiction between sealing and thermal management by creating distinct functional zones.
Solution Approach 2:
The insulating layer is nested between the outer case and the inner case, forming a sandwich structure. This nested configuration allows the insulating layer to effectively trap heat within the sealed inner case during operation while blocking external heat during non-use, thus preventing thermal degradation without compromising sealing.
2Temperature
If fin structures or metal plates are added to improve radiation performance during power generation, then heat dissipation is improved, but the device complexity increases
Solution Approach 1:
The inner case serves multiple functions: it provides structural support for the cell module, acts as a heat dissipation component through its high emissivity coating, and maintains the sealed environment. This multi-functionality eliminates the need for separate fin structures or metal plates, reducing device complexity while improving heat dissipation.
Solution Approach 2:
The inner case is coated with a high emissivity material (such as black oxide or anodized coating) that enhances thermal radiation. This surface treatment improves heat dissipation performance during power generation without adding structural complexity, as the coating is applied directly to the existing case surface.
3Use of energy by moving object
If the cell case directly receives heat from outside air at high temperature, then the heat transfer efficiency is improved, but the cell temperature rises causing thermal degradation during non-power generation
Solution Approach 1:
The insulating layer, which would normally prevent heat transfer, is strategically positioned to block harmful external heat during non-power generation. Meanwhile, during power generation, the high emissivity inner case efficiently radiates internally generated heat. The insulating layer thus converts the potential harm of heat transfer into a benefit by selectively blocking external heat while allowing internal heat management.
Solution Approach 2:
Different parts of the cell case have different thermal properties: the insulating layer has low thermal conductivity to block external heat, while the inner case has high emissivity to radiate internal heat. This local differentiation of thermal properties allows the system to simultaneously prevent heat ingress during non-use and facilitate heat egress during operation, protecting cell capacity.
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 improves heat dissipation at high temperatures during power generation while minimizing heat absorption during non-use, maintaining low battery temperatures and preventing capacity loss from thermal degradation.
Implementation Method 1
a first cover layer disposed on the outer surface of the battery module and having a higher thermal radiation coefficient or emissivity than that of the outer surface of the battery module, and a second cover layer disposed on the inner surface of the battery case having a higher thermal radiation coefficient or emissivity than that of the inner surface of the battery case
Implementation Method 2
a supporting mechanism for supporting the battery module, thereby forming a space between the outer surface of the battery module and inner surface of the battery case
Data Source
AI summary
A cell case is provided which maintains cell temperature low by reducing heat reception during no power generation, while ensuring heat dissipation performance during generating power, and which is capable of suppressing reduction of cell capacity due to thermal degradation. A structure for attaching the cell case is also provided. The cell case has a sealed structure and houses a battery module. The cell case has a supporting mechanism which forms a space between the outer surface of the battery module and the inner surface of the case. A first cover layer has a radiation emissivity larger than that of the outer surface of the battery module and is disposed on the outer surface of the cell module. A second cover layer has a radiation emissivity larger than that of the inner surface of the case and is disposed on the inner surface of the case.