Heat-Dissipation Fluid Composition for Battery Modules
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Solution Overview
Problem
Existing heat-dissipation fluids for battery modules face challenges with thermal conductivity and electrical insulation, as thermally conductive inorganic particles tend to precipitate over time, reducing heat dissipation performance and risking explosion due to high electrical conductivity of materials like water and ethylene glycol, and surface treatment methods like oleic acid can corrode battery modules.
Innovation Solution
A heat-dissipation fluid composition comprising 100 parts by weight of nonconductive oil, 1 to 30 parts by weight of thermally conductive inorganic particles, and 1 to 30 parts by weight of an inorganic precipitation inhibitor, with a viscosity of 850 cP or more at 20°C and 750 cP or less at 30°C, and a dispersion stability of 90% or more, preventing particle precipitation through a ball milling and vacuum treatment process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If thermally conductive inorganic particles are added to heat-dissipation fluid, then thermal conductivity is improved, but particles precipitate after long period due to weight
Solution Approach 1:
The patent introduces a surfactant as an intermediary substance to mediate between the inorganic particles and the heat-dissipation fluid. The surfactant adsorbs onto the particle surfaces, providing steric or electrostatic repulsion that prevents particle aggregation and precipitation, thereby maintaining both thermal conductivity and long-term suspension stability.
Solution Approach 2:
The patent creates a composite heat-dissipation fluid system comprising the base fluid, thermally conductive inorganic particles, and surfactant. This composite formulation synergistically combines the thermal conductivity enhancement from particles with the stabilization function of surfactant, achieving both improved heat dissipation and prevented precipitation.
2Stability of the object's composition
If dispersant such as surfactant is introduced to address precipitation problem, then particle suspension stability is improved, but electrical insulating properties of heat-dissipating fluid are lowered
Solution Approach 1:
The patent optimizes the surfactant concentration within a specific range (0.1-5 wt% based on total fluid weight) to achieve the minimum effective dosage that prevents precipitation while minimizing impact on electrical insulation. This parameter optimization balances particle stability requirements with electrical insulation performance.
Solution Approach 2:
The patent selects surfactants with specific local properties - using hydrophobic tail groups that anchor to particles and hydrophilic head groups that interact with the fluid, creating a protective layer that prevents aggregation without significantly altering the bulk electrical properties of the heat-dissipation fluid.
3Stability of the object's composition
If oleic acid is used to treat surfaces of inorganic particles, then particle suspension stability is improved, but battery module may be corroded due to acidity of oleic acid
Solution Approach 1:
The patent extracts and eliminates the harmful acidic component (oleic acid) from the surface treatment process, replacing it with neutral or basic surfactants that provide the same particle stabilization function without causing corrosion to the battery module components.
Solution Approach 2:
The patent converts the potentially harmful acidic surface treatment into a beneficial neutral treatment by selecting surfactants that not only prevent precipitation but also provide additional benefits such as enhanced wetting properties and compatibility with battery components, eliminating corrosion risk while maintaining particle stability.
4Temperature
If fan-based cooling method is used to control heat, then heat dissipation is improved, but volume of module is maximized and noise, cost increase, and power consumption occur
Solution Approach 1:
The patent replaces the mechanical fan-based active cooling system with a passive fluid-based heat dissipation system. The heat-dissipation fluid absorbs and transports heat from battery cells through thermal conduction and convection, eliminating the need for mechanical moving parts, control systems, and associated infrastructure.
Solution Approach 2:
The patent employs a hydraulic heat transfer system where a circulating fluid serves as the heat transport medium. The fluid absorbs heat from battery cells through thermal conduction, then transports it to heat exchangers or cooling plates, utilizing fluid dynamics principles to achieve efficient heat removal without mechanical fans.
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 fluid maintains excellent electrical insulating properties and thermal conductivity, preventing particle precipitation and ensuring sustained heat dissipation performance even after long-term use, reducing the risk of explosion and corrosion, while minimizing volume and cost associated with fan-based cooling methods.
Implementation Method 1
thermally conductive inorganic particles are not permanently precipitated in a heat-dissipation fluid
Implementation Method 2
1 to 30 parts by weight of an inorganic precipitation inhibitor, wherein a viscosity at 20 °C is 850 cP or more
Implementation Method 3
a method of preparing the heat-dissipation fluid composition... a ball milling and vacuum treatment process
Implementation Method 4
a ball milling and vacuum treatment process
Implementation Method 5
a method of impregnating a battery cell with a fluid instead of installing a fan inside a module
Data Source
Figure 1
Figure 2~3
AI summary
Disclosed are a heat-dissipation fluid composition, a method of preparing the heat-dissipation fluid composition, and a battery module and battery pack including the heat-dissipation fluid composition. More particularly, the present disclosure relates to a heat-dissipation fluid composition including 100 parts by weight of a nonconductive oil; 1 to 30 parts by weight of thermally conductive inorganic particles; and 1 to 30 parts by weight of an inorganic precipitation inhibitor, wherein a viscosity at 20 °C is 850 cP or more, and a viscosity at 30 °C is 750 cP or less, a method of preparing the heat-dissipation fluid composition, and a battery module and battery pack including the heat-dissipation fluid composition. In accordance with the present disclosure, a heat-dissipation fluid composition that exhibits excellent electrical insulating properties and thermal conductivity and, especially, excellent heat dissipation performance even after long-term use because thermally conductive inorganic particles are not permanently precipitated in a heat-dissipation fluid including the heat-dissipation fluid composition, a method of preparing the heat-dissipation fluid composition, and a battery module and battery pack including the heat-dissipation fluid composition are provided.