Battery Cell Group Thermal Layout for Local Heat Suppression
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Solution Overview
Problem
Conventional power storage devices experience local heat generation in battery cell groups despite the presence of heat transfer members, which can lead to temperature imbalances and potential overheating.
Innovation Solution
A power storage device design featuring a battery cell group with specific thermal resistance configurations, including heat insulating members and heat transfer members with varying thermal conductivities, along with a cooling portion and temperature sensors to manage heat distribution and detect early signs of overheating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If heat transfer members are provided between battery modules, then heat dissipation is improved, but local heat generation still occurs due to uniform heat transfer design
Solution Approach 1:
The patent applies local quality by setting different thermal resistance values for different heat transfer members. Specifically, the heat transfer member adjacent to the first battery module (which generates more heat) has lower thermal resistance to facilitate faster heat removal, while other heat transfer members have higher thermal resistance. This non-uniform thermal resistance distribution addresses local heat generation by optimizing heat transfer pathways according to the actual heat generation characteristics of different battery modules.
2Temperature
If heat insulating member is provided on one side of battery cell group, then heat transfer to cooling portion is improved, but temperature imbalance among cells increases
Solution Approach 1:
The patent applies asymmetry by providing the heat insulating member only on one side of the battery cell group (the side with the first battery module), rather than symmetrically on both sides. This asymmetric configuration allows the first battery module to efficiently transfer heat to the cooling portion while the heat insulating member prevents excessive heat transfer from the opposite side, thereby maintaining temperature balance across all cells.
Solution Approach 2:
The heat insulating member is strategically placed only where needed - on the side opposite to the cooling portion - to create localized thermal management. This allows different regions of the battery cell group to have different thermal characteristics, with the insulated side protecting cells from excessive heat loss while the non-insulated side enables efficient heat transfer to the cooling portion.
3Stability of the object's composition
If thermal insulation is enhanced between battery modules, then thermal isolation is improved, but heat dissipation capability deteriorates
Solution Approach 1:
The patent applies segmentation by dividing the thermal management approach into different zones: heat insulating members are placed between certain battery modules to provide thermal isolation, while heat transfer members with optimized thermal resistance are placed in other locations to ensure heat dissipation. This segmented thermal management strategy allows simultaneous achievement of thermal insulation where needed and heat dissipation where required.
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 design effectively suppresses local heat generation by optimizing heat transfer and detection, ensuring balanced temperature distribution and early detection of potential overheating issues.
Implementation Method 1
The heat insulating member is made of a material having a thermal conductivity lower than that of each of the first heat transfer member and the second heat transfer member. The heat insulating member is located on a first direction side of the battery cell group.
Implementation Method 2
In the third direction, a thermal resistance of the first heat transfer member is lower than a thermal resistance of the second heat transfer member. heat generated in the first cell can be more efficiently transmitted to the cooling portion
Data Source
AI summary
In a power storage device, a first heat transfer member is adjacent to a first cell on a second direction side opposite to a first direction side of the first cell. A second heat transfer member is adjacent to a second cell on a second direction side of the second cell. A heat insulating member is made of a material having a thermal conductivity lower than that of each of the first heat transfer member and the second heat transfer member. The heat insulating member is located on a first direction side of the battery cell group. A cooling portion is in contact with the first heat transfer member and the second heat transfer member. In a third direction, a thermal resistance of the first heat transfer member is lower than a thermal resistance of the second heat transfer member.