Immersion-Cooled Battery Pack Using Dual Fluorinated Refrigerants
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Solution Overview
Problem
Lithium-ion battery packs face significant heat dissipation challenges, leading to safety concerns due to increased integration, necessitating an efficient heat dissipation solution with improved safety performance.
Innovation Solution
A battery pack design incorporating a non-azeotropic refrigerant mixture of fluorine-containing cooling media, including fluorinated ethers and fluorinated hydrocarbons or perfluoroketones, with a circulating pipeline and heat exchanger system, along with a temperature monitoring device and pressure measuring module, to enhance heat dissipation and flame retardancy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If lithium-ion batteries are integrated into battery packs for practical applications, then the battery pack provides usable energy storage, but heat dissipation problems become more serious leading to safety issues
Solution Approach 1:
The patent changes the chemical composition parameters of the cooling medium by using a non-azeotropic mixture of fluorinated ether and fluorinated hydrocarbon/perfluoroketone/florinated alcohol, rather than conventional cooling media. This parameter change enables the cooling system to achieve both efficient heat dissipation and flame retardancy, resolving the contradiction between heat dissipation performance and safety
Solution Approach 2:
The patent employs a composite cooling medium consisting of two different fluorine-containing substances mixed together. The first fluorine-containing cooling medium (fluorinated ether) provides excellent heat dissipation properties, while the second fluorine-containing cooling medium (fluorinated hydrocarbon, perfluoroketone, or fluorinated alcohol) contributes flame retardant properties. This composite approach allows the battery pack to simultaneously achieve good heat dissipation and safety performance
2Reliability
If a single cooling medium is used, then the system is simple to operate, but it cannot achieve both efficient heat dissipation and flame retardancy
Solution Approach 1:
The patent modifies the composition parameters of the refrigerant by introducing a non-azeotropic mixture of two fluorine-containing cooling media. This parameter change enables the system to achieve complementary advantages: the first fluorine-containing cooling medium provides heat dissipation efficiency while the second provides flame retardancy, without requiring complex system modifications
Solution Approach 2:
The non-azeotropic refrigerant mixture serves multiple functions simultaneously: it acts as both a heat dissipation medium and a flame retardant. The two fluorine-containing cooling media work together to provide both cooling efficiency and safety protection, eliminating the need for separate systems for these functions
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 solution achieves efficient heat dissipation and improved safety performance by leveraging the complementary advantages of the refrigerant mixture, ensuring smoother cooling system operation and enhanced flame retardant properties, thereby addressing the heat dissipation and safety issues in lithium-ion battery packs.
Implementation Method 1
a battery cell at least partially immersed in a refrigerant... efficient heat dissipation function
Implementation Method 2
a circulating pipeline located outside the case, connecting the outlet and the inlet for the refrigerant... heat exchanger and a condenser located on the circulating pipeline
Implementation Method 3
the first fluorine-containing cooling medium is selected from a fluorinated ether, and the second fluorine-containing cooling medium is selected from one or more of a fluorinated hydrocarbon, a perfluoroketone or a fluorinated alcohol... good flame retardant properties
Data Source
AI summary
A battery pack and an electrical device including the same are described. The battery pack includes a battery cell at least partially immersed in a refrigerant; a case for accommodating the battery cell and the refrigerant and provided with an outlet and an inlet for the refrigerant; a circulating pipeline located outside the case, connecting the outlet and the inlet for the refrigerant to form a closed system; a heat exchanger and a condenser located on the circulating pipeline; a pressure measuring module provided with one end arranged inside the case and configured for detecting an internal pressure of the case; a temperature monitoring device for detecting a temperature of the battery cell and a fluorine-containing cooling medium in real time; and a battery control module for managing the battery cell; where the refrigerant includes at least a first fluorine-containing cooling medium and a second fluorine-containing cooling medium.