Battery Cell Partition Structure for High-Temperature Heat Control
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Solution Overview
Problem
Existing partition members for battery assemblies lack stability at high temperatures and have a short 'plateau time' for water vaporization, leading to potential chain reactions and damage to adjacent battery cells.
Innovation Solution
Incorporating a composition part containing inorganic particles, inorganic fibers, and a binder within an inner enclosure body of the partition member to enhance shape stability and thermal resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a heat transfer control layer with water-containing paste material is used in the partition member, then thermal management function is improved, but shape stability deteriorates at high temperature
Solution Approach 1:
The paste material is formulated as a composite containing inorganic particles (5-50 wt%), inorganic fibers (5-50 wt%), binder (10-40 wt%), and water (20-60 wt%). This composite structure provides both thermal management capability through water vaporization and shape stability through the reinforcing inorganic components that prevent deformation at high temperatures.
Solution Approach 2:
The paste material undergoes controlled parameter changes during thermal management - water evaporates at controlled rates, and the material transitions from liquid-containing to more solid-like state. The inorganic particles and fibers maintain structural integrity throughout these parameter changes, ensuring shape stability is preserved even as thermal management functions are activated.
2Temperature
If water is used as the liquid in the heat transfer control layer, then heat transfer efficiency is improved, but plateau time is shortened
Solution Approach 1:
The paste material contains inorganic particles and fibers that create a porous structure, allowing water to be retained and evaporate gradually. This porous network provides capillary action that maintains water availability for extended periods, lengthening the plateau time while preserving efficient heat transfer through the water-containing structure.
Solution Approach 2:
The inorganic particles and fibers are distributed throughout the paste material to create localized regions with different properties. Some regions provide water reservoirs for extended vaporization, while other regions maintain thermal conductivity pathways, achieving both extended plateau time and sustained heat transfer efficiency.
3Stability of the object's composition
If the partition member is made more rigid to maintain shape stability, then shape stability is improved, but compressibility deteriorates
Solution Approach 1:
The partition member exhibits dynamic mechanical properties - at normal temperatures it maintains rigid shape stability through the inorganic particle-fiber-binder matrix, but under compression or at elevated temperatures it becomes more compliant. The water content and its phase changes provide dynamic adjustment of mechanical properties, allowing the member to be rigid when needed and compliant when compressed.
Solution Approach 2:
The mechanical parameters of the partition member change with temperature and moisture content. The inorganic composite structure provides baseline rigidity, while the water-containing binder matrix allows for parameter adjustment - becoming more compliant under compression through water redistribution and phase changes, thus achieving both shape stability and compressibility.
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 partition member maintains shape stability at high temperatures and reduces thermal conductivity and deformation under pressure, effectively controlling heat transfer and preventing damage to adjacent battery cells.
Implementation Method 1
the composition part contains at least one of inorganic particles and inorganic fibers, and a binder
Implementation Method 2
reduces thermal conductivity and deformation under pressure, effectively controlling heat transfer
Data Source
AI summary
What is provided is a partition member that partitions battery cells, the partition member having excellent shape stability even at a high temperature, and a battery assembly that uses the partition member. A layer for controlling heat transfer is retained in a retaining part having compressibility to form an inner enclosure body, and the inner enclosure body is encapsulated in an outer casing body to form a partition member. The retaining part is preferably formed in a tray shape, is provided to have a thickness larger than that of the layer for controlling heat transfer, and is configured such that an area of the outer casing body coming into contact with the inner enclosure body increases with an increase in an external pressure applied to the partition member.