Battery Pack Heat Absorber Using Leak-Resistant Paraffin Composite
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Solution Overview
Problem
Existing battery packs face challenges with heat management due to phase-change materials prone to leakage, which affects heat absorption efficiency and contaminates the battery pack, complicating and costing more in manufacturing.
Innovation Solution
A battery pack design incorporating a heat absorber made of a paraffin wax mixture, including a hydrophilically treated paraffin wax and a colloidal material, which is mixed and dehydrated to form a stable, insoluble-in-water phase-change material, preventing leakage and enhancing heat absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If phase-change material is used to absorb heat, then heat absorption effect is improved, but the material is prone to leakage during phase change
Solution Approach 1:
The patent uses a water-soluble polymer coating film to encapsulate the paraffin wax phase-change material. This thin film shell prevents leakage during phase change while allowing the material to maintain its heat absorption functionality. The flexible polymer matrix accommodates volume changes during melting and solidification without rupturing.
Solution Approach 2:
The patent creates a composite material system where paraffin wax (phase-change component) is combined with water-soluble polymer (binding and encapsulating component). This composite structure provides both the heat absorption capability of paraffin and the leakage prevention properties of the polymer matrix, resolving the contradiction between heat absorption and leakage resistance.
2Temperature
If phase-change material is used to absorb heat, then heat absorption effect is improved, but it contaminates the battery pack
Solution Approach 1:
The water-soluble polymer coating acts as a containment shell that prevents the paraffin wax from leaking and contaminating surrounding battery components. The film maintains integrity during phase transitions, isolating the phase-change material within the heat absorber structure.
Solution Approach 2:
The patent uses a water-soluble polymer that can be applied as a coating layer over the phase-change material. This polymer shell serves as a protective barrier that replicates the containment function needed to prevent contamination while allowing the underlying paraffin to perform its heat absorption function.
3Reliability
If phase-change material is sealed to prevent leakage, then leakage resistance is improved, but manufacturing process becomes complicated and costly
Solution Approach 1:
The patent combines the phase-change material and the encapsulating shell into a single integrated heat absorber component. The water-soluble polymer is mixed with or coated onto the paraffin wax, creating a unified structure that prevents leakage without requiring separate sealing steps or complex assembly processes.
Solution Approach 2:
By creating a composite material where the water-soluble polymer and paraffin wax are combined at the material level rather than as separate components, the patent eliminates the need for complex sealing processes. The composite structure inherently provides leakage prevention through its material composition rather than through additional manufacturing steps.
4Temperature
If traditional phase-change material is used, then heat absorption is achieved, but service life is reduced due to leakage and contamination
Solution Approach 1:
The water-soluble polymer coating provides long-term containment of the phase-change material throughout the battery's service life. This protective shell prevents degradation from leakage and contamination, maintaining the heat absorption functionality over extended periods and thereby extending service life.
Solution Approach 2:
The patent employs a water-soluble polymer that provides sufficient durability for the battery's operational lifespan. The polymer coating is designed to maintain its protective function throughout the intended service life, preventing material degradation and ensuring consistent heat absorption performance without requiring replacement or maintenance.
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 proposed solution effectively absorbs heat generated during charging and discharging, preventing leakage and contamination, thus extending the service life of the battery pack and maintaining stable output performance.
Implementation Method 1
the heat absorber is capable of undergoing a phase change reaction when absorbing the heat generated by the cell assembly
Implementation Method 2
the heat absorber is capable of undergoing a phase change reaction when absorbing the heat generated by the cell assembly
Implementation Method 3
a paraffin wax mixture, including a hydrophilically treated paraffin wax and a colloidal material, which is mixed and dehydrated to form a stable, insoluble-in-water phase-change material
Data Source
AI summary
A battery pack includes a housing; a cell assembly disposed in the housing and including multiple cell units; and a heat absorber in thermal contact with at least one cell unit to absorb the heat generated by the cell assembly during a charging and discharging process of the battery pack. The heat absorber contains at least paraffin wax, and the mass of the paraffin wax accounts for 70% to 90% of the mass of the heat absorber.