Pouch Battery Immersion Cooling Using Porous Evaporative Media
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Solution Overview
Problem
Conventional battery cooling methods, such as water-cooling and air-cooling, are not suitable for high-performance batteries with replaceable batteries, as they require replacing the battery and cooling fluid lines, and liquid immersion cooling increases battery weight due to dense cooling fluids and restricted fluid movement.
Innovation Solution
A pouch type battery liquid immersion cooling system using a porous absorbent material with a cooling fluid that evaporates and condenses, providing higher cooling performance with a limited amount of fluid, and includes a cooling unit with glass fiber, polypropylene, or amorphous silica fiber, and a fixed cartridge for efficient heat exchange.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If liquid immersion cooling is used to cool the battery, then cooling performance is improved, but battery weight increases due to dense cooling fluids
Solution Approach 1:
The patent uses porous absorbent material (such as porous polymer foam) to hold and distribute the cooling fluid throughout the battery pack. The porous structure allows the fluid to be retained in specific locations while enabling capillary action and evaporation, achieving effective heat dissipation without requiring large amounts of dense cooling fluid, thus improving cooling performance while controlling weight.
Solution Approach 2:
The patent utilizes the phase transition (evaporation and condensation) of the cooling fluid within the porous absorbent material. The fluid evaporates to absorb heat from the battery cells, then condenses and cycles back, creating a continuous passive cooling system that leverages latent heat of vaporization for highly efficient cooling without requiring pump-driven fluid circulation, thereby reducing both weight and complexity.
2Temperature
If insulating fluid is used for liquid immersion cooling, then cooling performance is improved, but battery weight increases due to high density of the fluid
Solution Approach 1:
The porous absorbent material acts as a lightweight scaffold that holds the insulating cooling fluid in place throughout the battery pack. This structure allows the use of insulating fluids (which have lower thermal conductivity and can be lighter than water-based coolants) without sacrificing cooling effectiveness, as the porous network ensures uniform fluid distribution and maintains contact with heat-generating components.
Solution Approach 2:
The system employs passive evaporation and condensation cycles within the porous material, eliminating the need for external pumps, fans, or active fluid circulation systems. The cooling fluid automatically cycles through evaporation (absorbing heat) and condensation (releasing heat) phases, providing self-sustaining cooling that reduces mechanical components and overall system weight.
3Weight of moving object
If only a portion of the battery is filled with cooling fluid, then weight is reduced, but fluid movement is restricted making it difficult to uniformly cool all battery cells
Solution Approach 1:
The porous absorbent material is distributed throughout the entire battery pack structure, providing a continuous network that holds and conducts the cooling fluid to all battery cells uniformly. This ensures that even with limited fluid volume, heat is efficiently transferred from all cells to the fluid through the porous matrix, achieving uniform cooling across the entire pack without requiring large amounts of fluid or complex circulation systems.
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 achieves lighter weight and higher cooling performance by utilizing latent heat of evaporation, maintaining battery temperature effectively with a reduced amount of cooling fluid, and does not require continuous fluid supply, enhancing gravimetric energy density.
Implementation Method 1
a pouch type battery liquid immersion cooling system which may be continuously cooled with a limited amount of the fluid by evaporating and condensing the cooling fluid included in the absorbent material, and may achieve the higher cooling performance by using latent heat of the evaporation
Implementation Method 2
achieve the higher cooling performance by using latent heat of the evaporation
Implementation Method 3
evaporating and condensing the cooling fluid included in the absorbent material
Implementation Method 4
a cooling unit which includes a porous absorbent member, and includes a cooling fluid flowing the inside and outside thereof
Data Source
AI summary
Provided is a battery pack cooling system. A pouch type battery liquid immersion cooling system of the present disclosure having the above configuration may have a lighter weight and higher cooling performance than a conventional liquid immersion cooling system by using an absorbent material including a cooling fluid inside, may be continuously cooled with a limited amount of the fluid by evaporating and condensing the cooling fluid included in the absorbent material, and may achieve the higher cooling performance by using latent heat of the evaporation.