Lubricating Oil Composition for Battery, Motor, and Gear Cooling
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Solution Overview
Problem
Existing lubricating oil compositions for electric motors and reduction gears in battery cooling systems fail to balance high cooling performance, safety, and insulation properties, necessitating separate compositions for each device, which complicates temperature control.
Innovation Solution
A lubricating oil composition that meets specific criteria for cooling performance, flash point, and volume resistivity, combined with a circulation system that includes parallel paths and control valves to manage temperature across secondary batteries, electric motors, and reduction gears.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single lubricating oil composition is used for multiple devices (secondary battery, electric motor, reduction gear), then device complexity and system cost are reduced, but it becomes difficult to simultaneously satisfy different temperature control requirements and performance specifications for each device
Solution Approach 1:
The patent develops a universal lubricating oil composition that can be used across multiple devices (secondary battery, electric motor, reduction gear) instead of requiring separate compositions for each device. This multi-functional oil satisfies the diverse performance requirements of different devices through careful selection of base oil and additive packages, thereby reducing system complexity while maintaining reliable temperature control for each specific application.
Solution Approach 2:
The patent optimizes specific physical and chemical parameters of the lubricating oil composition, including viscosity characteristics, flash point, and electrical properties, to ensure the oil can simultaneously meet the different operational requirements of multiple devices. By precisely controlling these parameters within specific ranges, the composition achieves broad applicability while maintaining device-specific performance.
2Temperature
If high cooling performance is achieved for secondary batteries, then battery temperature control is improved, but the oil may not provide sufficient insulation properties required for electric motors with semiconductors
Solution Approach 1:
The patent carefully balances and controls the physical and chemical parameters of the lubricating oil composition to achieve both high cooling performance and adequate insulation properties. By optimizing viscosity, thermal conductivity, and electrical resistance parameters within specific ranges, the oil can effectively cool secondary batteries while providing sufficient electrical insulation for electric motor semiconductors.
Solution Approach 2:
The patent employs a composite lubricating oil formulation combining specific base oils with carefully selected additive packages. This composite composition integrates materials with complementary properties - base oils providing thermal management capabilities and additives enhancing electrical insulation characteristics - thereby achieving both high cooling performance and adequate insulation properties simultaneously.
3Temperature
If the lubricating oil has high electrical conductivity for better heat dissipation, then cooling performance improves, but safety decreases due to lower flash point and reduced insulation for electrical components
Solution Approach 1:
The patent optimizes the electrical conductivity parameter of the lubricating oil within a specific range that balances heat dissipation capability with safety requirements. By controlling conductivity, flash point, and viscosity parameters simultaneously, the oil achieves adequate thermal management performance while maintaining sufficient electrical insulation and safety margins for use around electrical components and semiconductors.
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 composition and system effectively control temperatures of secondary batteries, electric motors, and reduction gears, ensuring safety and insulation while maintaining optimal operating conditions.
Implementation Method 1
a silver bar with an initial surface temperature T0 of 200°C is placed in a lubricating oil composition with a temperature of 80°C, and a surface temperature T12 (°C) of the silver bar is measured 12 seconds later, and a silver bar temperature change amount ΔT calculated from T0 - T12 is 70°C or higher
Implementation Method 2
a lubricating oil composition to be circulated in a circulation circuit connected to at least a secondary battery, an electric motor, and a reduction gear
Data Source
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AI summary
To obtain a lubricating oil composition capable of controlling temperatures of a secondary battery, an electric motor, and a reduction gear, and a circulation system using the lubricating oil composition. A lubricating oil composition to be circulated in a circulation circuit connected to at least a secondary battery, an electric motor, and a reduction gear, and to be used to control temperatures of at least the secondary battery, the electric motor, and the reduction gear, wherein: in accordance with a "cooling performance test method: method A" specified in JIS K2242:2012, a silver bar with an initial surface temperature T0 of 200°C is placed in a lubricating oil composition at 80°C, and a surface temperature T12 (°C) of the silver bar is measured 12 seconds later, and a silver bar temperature change amount ΔT calculated from T0 - T12 is 70°C or higher; a flash point measured by a Cleveland open cup method (C.O.C method) in accordance with JIS K2265-4:2007 is 100°C or higher; and a volume resistivity measured in accordance with JIS C2101:1999 is 1.0 × 107 Ω·cm or more.