Immersed Battery Cooling via Liquid Refrigerant
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Solution Overview
Problem
Existing thermal management technologies for power batteries in electric vehicles, such as air-cooling and liquid-cooling methods, face challenges in efficiently controlling battery temperature, leading to uneven heat distribution and potential safety issues like thermal runaway or explosion, due to low heat transfer efficiency and ambient temperature control difficulties.
Innovation Solution
An immersed heat dissipation device for power batteries, comprising a sealed battery heat dissipation module with a liquid refrigerant, where multiple modules are connected in parallel, each containing a battery unit immersed in the refrigerant, allowing for efficient heat exchange and temperature control through a main inlet and outlet pipe system, with optional expansion relief valves and temperature sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If air-cooling technology is used, then the device complexity is reduced, but the heat dissipation efficiency is low and temperature control is difficult
Solution Approach 1:
The patent transitions from air-cooling to liquid-cooling technology, using coolant circulation through pipes to achieve efficient heat dissipation. The liquid cooling system includes coolant channels that directly contact battery surfaces, enabling effective heat transfer while maintaining manageable system complexity through standardized pipe and pump components.
Solution Approach 2:
The patent introduces a coolant as an intermediary substance between the battery and the cooling system. The coolant absorbs heat from the battery through thermal conduction and transports it to external heat exchangers, solving the problem of direct heat removal while maintaining system modularity and control capability.
2Productivity
If liquid-cooling pipes are interposed between batteries, then the heat transfer path is extended, but the heat dissipation effect is not ideal
Solution Approach 1:
The patent implements localized cooling by positioning cooling pipes in direct contact with or adjacent to specific battery cells that generate the most heat. The cooling system is designed with targeted heat exchange areas at battery terminals and surfaces, providing enhanced cooling where needed most rather than uniform cooling throughout the entire battery pack.
Solution Approach 2:
The patent integrates cooling pipes and heat exchange structures within the existing battery pack architecture. The cooling channels are nested between battery cells or integrated into battery terminals, allowing the cooling system to occupy minimal additional space while maximizing heat transfer efficiency through direct thermal contact.
3Use of energy by moving object
If natural cooling is used, then the energy consumption is reduced, but the temperature control precision is poor
Solution Approach 1:
The patent employs dynamically adjustable cooling through electronically controlled pumps and variable speed fans that can modulate coolant flow rates and air circulation based on real-time battery temperature conditions. This dynamic control enables precise temperature management while optimizing energy consumption by adjusting cooling intensity to match actual thermal demands.
Solution Approach 2:
The patent incorporates temperature sensors and control systems that continuously monitor battery temperature and adjust cooling system operation accordingly. The feedback control mechanism modulates pump speed, fan rotation, and coolant flow to maintain optimal battery temperature ranges, achieving precise temperature control while minimizing unnecessary energy consumption during low-thermal-load conditions.
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 immersed heat dissipation device effectively cools the battery, maintains uniform temperature, and enhances the performance and lifespan of power batteries by addressing inefficiencies in existing cooling methods, particularly during fast charging and normal driving processes.
Implementation Method 1
the liquid refrigerant exchanges heat with the battery unit at the battery heat dissipation module
Implementation Method 2
the liquid refrigerant is branched by the main inlet pipe through the liquid inlet to enter the battery heat dissipation module; the liquid refrigerant exchanges heat with the battery unit
Implementation Method 3
each of the battery units is immersed in the liquid refrigerant in the battery heat dissipation module
Data Source
AI summary
The present invention relates to an immersed heat dissipation device for power battery, comprising a battery heat dissipation module, a battery unit, a liquid refrigerant, a main inlet pipe and a main outlet pipe, wherein the battery heat dissipation module is a structure of sealed box that contains the liquid refrigerant, and a plurality of the battery heat dissipation modules are connected to each other and arranged in the heat dissipation device for power battery. The battery can be effectively cooled and the temperature of the battery can be effectively controlled, and ensure a uniform temperature for the battery unit, thereby improving the performance and life of the power battery of new energy vehicle.