Immersion Battery Cooling Structure Using Passive Liquid Circulation
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Solution Overview
Problem
Conventional battery cooling systems are inefficient in preventing fires due to thermal runaway and consume continuous energy, lacking a structure that can effectively manage battery temperature and reduce energy consumption.
Innovation Solution
A battery fire safety structure utilizing a non-powered liquid immersion circulation system with two cooling solutions of different specific gravities, where the battery is immersed in a first and second solution, allowing for power-free circulation and enhanced cooling without chemical reaction, and a heat radiation part for efficient heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a conventional battery cooling device is used to manage battery temperature, then the battery temperature can be controlled, but continuous energy consumption is required for circulating the cooling fluid
Solution Approach 1:
The cooling system utilizes natural convection currents generated by temperature differences within the battery pack itself to circulate the cooling fluid, eliminating the need for external power sources. The heated cooling fluid naturally rises and cooler fluid sinks, creating a self-sustaining circulation pattern that cools the battery without continuous energy input
Solution Approach 2:
The patent replaces the mechanical pumping system with a passive thermal convection system. Instead of using powered pumps to force circulation of the cooling fluid, the system relies on natural buoyancy-driven flow patterns created by temperature gradients, substituting mechanical energy input with thermal physics-based passive cooling
2Reliability
If a battery cooling device is arranged in a battery case to lower battery temperature, then battery fire can be prevented, but the structure cannot ultimately prevent fire and requires continuous energy
Solution Approach 1:
The cooling system is designed to automatically activate and sustain itself through the thermal conditions naturally present during battery operation. When batteries generate heat during charging or discharging, this heat creates convection currents that automatically circulate the cooling fluid, providing continuous fire prevention capability without requiring external power
Solution Approach 2:
The system changes the operational parameters from active powered circulation to passive thermal-driven circulation. By designing the cooling channels and fluid properties to maximize natural convection effects, the system achieves reliable fire prevention through parameter changes that eliminate the need for continuous energy input while maintaining effective temperature control
3Reliability
If a cooling device is used to manage battery temperature, then thermal runaway can be prevented, but the device adds weight and complexity to the battery system
Solution Approach 1:
The cooling function is merged directly into the battery pack structure itself. The cooling channels are integrated within the battery case or module housing, and the cooling fluid serves dual purposes as both thermal management medium and fire suppression agent. This integration eliminates separate cooling system components, reducing overall complexity while maintaining effective thermal runaway prevention
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 system effectively manages battery temperature, prevents fires, and reduces energy consumption by enabling smooth circulation of cooling solutions without power, providing improved cooling efficiency compared to conventional methods.
Implementation Method 1
a first solution and a second solution formed of liquids having electrical insulation properties that absorb heat generated in the battery
Implementation Method 2
a non-powered liquid immersion circulation system... enabling smooth circulation of cooling solutions
Implementation Method 3
the second solution is formed to have a specific gravity greater than a specific gravity of the first solution
Implementation Method 4
non-powered liquid immersion circulation system... smooth circulation of cooling solutions without power
Implementation Method 5
a heat radiation part for efficient heat dissipation
Data Source
AI summary
A battery fire safety structure to which a non-powered liquid immersion circulation system is applied is provided. A battery fire safety structure including a case having an inner space, a battery disposed in the case, and a first solution and a second solution formed of liquids having electrical insulation properties that absorb heat generated in the battery and disposed in the case so that the battery is immersed in the first solution and the second solution may be provided, wherein the second solution is formed to have a specific gravity greater than a specific gravity of the first solution, and when the battery is not used, the first solution is disposed above the second solution.