Battery Module Multilayer Barrier for Cell-to-Cell Heat Isolation
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Solution Overview
Problem
Heat transfer and sequential explosions between secondary battery cells pose significant challenges, with one cell's explosion potentially causing a chain reaction in neighboring cells due to heat and flame propagation.
Innovation Solution
A battery module design featuring a multilayer member with a fireproof portion and a heat transfer prevention portion, where the fireproof portion is formed of a material with high thermal conductivity and the heat transfer prevention portion has lower thermal conductivity, strategically positioned to prevent heat and flame propagation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a single-layer member with high thermal conductivity is used between battery cells, then heat dissipation is improved, but heat transfer between cells increases causing safety hazards
Solution Approach 1:
The insulating member is divided into multiple layers with different thermal conductivities. The first layer (facing the battery cell) has high thermal conductivity for heat dissipation, while the second layer (facing adjacent cells) has low thermal conductivity to prevent heat transfer. This segmentation allows each layer to perform its specific function independently.
Solution Approach 2:
Different portions of the insulating member have different thermal conductivity properties tailored to their specific functions. The first layer has high thermal conductivity locally optimized for heat dissipation from the battery cell, while the second layer has low thermal conductivity locally optimized for preventing heat transfer to adjacent cells.
2Object-affected harmful factors
If a multilayer member with different thermal conductivities is used, then heat transfer prevention is improved, but device complexity increases
Solution Approach 1:
The heat transfer prevention function is extracted from a single homogeneous layer and separated into distinct layers with specialized properties. The first layer handles heat dissipation while the second layer handles heat transfer prevention, allowing each to be optimized independently without compromising the other.
Solution Approach 2:
The insulating member uses composite structure with multiple layers having different thermal conductivity characteristics. This composite approach combines the advantages of high thermal conductivity materials (for heat dissipation) and low thermal conductivity materials (for heat transfer prevention) into a single integrated component.
3Object-affected harmful factors
If the insulating member thickness is increased, then heat transfer prevention is improved, but space for battery cells is reduced
Solution Approach 1:
The thermal conductivity parameter is changed across different layers rather than uniformly increasing thickness. By using materials with different thermal conductivity values, effective heat transfer prevention is achieved with thinner overall structure, preserving more space for 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
Effectively prevents heat transfer and subsequent explosions by maintaining structural integrity and reducing thermal conductivity, thereby safeguarding adjacent cells from heat and flame damage.
Implementation Method 1
a heat transfer prevention portion provided to be in contact with the fireproof portion on both sides thereof to form an inner layer, and formed of a material having thermal conductivity lower than thermal conductivity of the fireproof portion
Implementation Method 2
the fireproof portion of the battery module according to an embodiment of the present disclosure may be formed of a material having a degree of fire resistance higher than fire resistance of the heat transfer prevention portion
Data Source
AI summary
A battery module according to an embodiment of the present disclosure includes a plurality of secondary battery cells, a housing member in which the plurality of secondary battery cells are accommodated, and a multilayer member provided between the plurality of secondary battery cells, at least a portion of the multilayer member in a first direction being formed of a material having a thermal conductivity lower than that of other portions thereof.