Battery Cooling Assembly Using Framework-Supported Phase Change Filler

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Solution Overview

Problem

Lyophilic polymer materials like hydrogels, despite their ability to absorb and retain large amounts of liquid, suffer from poor formability and mechanical properties, leading to deformation under gravity or inertia, which affects their heat dissipation effectiveness on batteries.

Innovation Solution

A cooling assembly comprising a framework with penetrating holes and a filler made of a lyophilic polymer matrix and liquid phase change medium, supported by the framework to prevent deformation, enhances heat dissipation through single-phase heat absorption and latent heat vaporization, with a flexible framework and encapsulation film to improve exhaust and structural integrity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Quantity of substance

If lyophilic polymer materials such as hydrogels are used as cooling fillers, then liquid absorption and retention capacity is improved, but formability and mechanical properties deteriorate leading to deformation under gravity or inertia

Engineering Contradiction:

Improveliquid absorption capacityVSAvoidmechanical properties

Core Design Contradiction:

Quantity of substanceVSStrength

Solution Approach 1:

The patent combines lyophilic polymer materials with a framework structure to create a composite cooling filler. The framework provides mechanical support and prevents deformation, while the polymer material maintains its liquid absorption capacity. This composite structure resolves the contradiction by allowing both high liquid retention and adequate mechanical strength to coexist.

Inventive Principle:

Principle #40Composite materials

2Quantity of substance

If lyophilic polymer materials are used as cooling fillers, then liquid retention is improved, but formability deteriorates causing deformation under gravity or inertia

Engineering Contradiction:

Improveliquid retention capacityVSAvoidformability

Core Design Contradiction:

Quantity of substanceVSShape

Solution Approach 1:

The framework-based composite structure provides the necessary shape stability and formability, while the lyophilic polymer filler retains its liquid retention properties. The framework acts as a structural skeleton that prevents deformation under gravity or inertia, solving the formability issue without compromising liquid retention.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The framework structure creates a porous architecture that allows the lyophilic polymer material to be held in a stable, deformable-resistant form while maintaining access to liquid phase change medium. The porous structure provides both shape stability and liquid absorption pathways.

Inventive Principle:

Principle #31Porous materials

3Loss of time

If the cooling assembly is placed closer to the battery surface to improve response speed, then heat dissipation response time is improved, but structural stability may deteriorate

Engineering Contradiction:

Improveheat dissipation response timeVSAvoidstructural stability

Core Design Contradiction:

Loss of timeVSStability of the object's composition

Solution Approach 1:

The framework-based composite structure enables the cooling assembly to be positioned close to the battery surface while maintaining structural stability. The framework provides the necessary mechanical strength to support the assembly in this close-proximity configuration without deforming, thus achieving both fast response time and structural stability.

Inventive Principle:

Principle #40Composite materials

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 cooling assembly provides high heat dissipation efficiency, fast response, and improved exhaust capabilities, maintaining structural integrity while enhancing the safety and crash resistance of battery packs.

Implementation Method 1

a process in which the liquid phase change medium absorbs heat includes two processes: single-phase heat absorption and latent heat of vaporization

Methodology Applied

Scientific EffectLatent heat: Latent Heat

Implementation Method 2

latent heat of vaporization

Methodology Applied

Scientific EffectEvaporation: Evaporation

Implementation Method 3

polymer materials with a lyophilic three-dimensional network structure, such as hydrogels, can absorb and retain a large amount of water (up to 99%) or other liquids due to a cross-linked network structure and a large quantity of lyophilic groups

Methodology Applied

Scientific EffectAbsorption: Absorption (physical)

Data Source

PatentEP4675755A1Cooling assembly, battery pack comprising same, and vehicle

Publication Date: 2026.01.07 BYD CO LTD

Figure 1~3
Figure 4~6

AI summary

This application provides a cooling assembly, a battery pack having the same, and a vehicle. The cooling assembly includes a framework and a filler. The framework includes a plurality of holes penetrating the framework in a thickness direction of the framework. The filler fills the holes, the filler includes a matrix and a liquid phase change medium, and the matrix includes a lyophilic polymer material.