PCM-Integrated Casing for Electrochemical Cell Thermal Management
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Solution Overview
Problem
Existing electrochemical device thermal management systems face challenges in effectively managing temperature fluctuations, leading to performance degradation and safety hazards due to overheating, particularly in high-power applications like lithium-ion batteries, where existing materials lack impact resistance, tight fitting capabilities, and efficient thermal conductivity.
Innovation Solution
A casing or sleeve made from a polymer matrix containing phase change materials (PCMs) and elastomeric materials, which provides thermal management by reducing operating temperatures through latent heat absorption and maintaining close contact with the cell, even under size variations and impact, while being corrosion-resistant and fire-retardant.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If passive cooling systems are used to manage temperature fluctuations, then thermal management is achieved, but the systems are bulky, heavy, and expensive
Solution Approach 1:
The patent incorporates phase change materials (PCMs) that absorb and release thermal energy during phase transitions (solid-liquid changes). These PCMs are encapsulated in microcapsules and integrated into the battery electrode structures, enabling passive thermal management through the natural phase change process without requiring external cooling equipment, thereby eliminating the bulk and weight of traditional cooling systems
Solution Approach 2:
The patent embeds microencapsulated phase change materials within the internal structure of battery electrodes. The PCM microcapsules are nested within the electrode matrix at the microscopic level, creating a hierarchical structure where the thermal management functionality is integrated into the existing battery architecture rather than added as a separate external system, thus minimizing additional weight and space
2Temperature
If active cooling methods are used to shuttle heat away from the surface, then thermal management effectiveness is improved, but the size and complexity become prohibitive
Solution Approach 1:
The patent enables the battery to manage its own thermal conditions through self-regulating phase change materials embedded within the electrodes. The PCMs automatically absorb excess heat during charging/discharging operations and release it during cooling periods without requiring external control systems, pumps, or active cooling mechanisms, thereby achieving effective thermal management while eliminating system complexity
Solution Approach 2:
The phase change materials are pre-positioned within the electrode structures before battery assembly. The PCMs are already in place to absorb heat as it is generated during operation, providing proactive thermal management rather than reactive cooling. This preliminary integration of thermal management capability eliminates the need for complex active cooling systems that would be required to respond to thermal issues after they arise
3Temperature
If existing insulators are used to mitigate temperature escalation, then performance degradation is reduced, but impact resistance and tight fitting capabilities are insufficient
Solution Approach 1:
The patent creates a composite structure where microencapsulated phase change materials are integrated within the electrode matrix. This composite approach combines the thermal management properties of PCMs with the structural properties of electrode materials, achieving both temperature escalation mitigation and mechanical strength. The encapsulated PCMs are distributed throughout the electrode composite, providing thermal protection while maintaining or enhancing impact resistance compared to conventional insulators
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 PCM-TMM casing effectively reduces operating temperatures by up to 10°C, enhances safety by preventing thermal runaway, and extends the lifespan of electrochemical cells by minimizing heat-related degradation, while being scalable and easy to apply.
Implementation Method 1
the inner surface is substantially solid at room temperature. The polymer matrix may be substantially homogeneous, and, in an environment where the electrochemical cell and a second electrochemical cell operate under the same charging and discharging conditions, the casing may reduce a first operating temperature of the electrochemical cell by at least 10° C.
Implementation Method 2
at least one other of the two or more temperature management materials may comprise an elastomeric material
Data Source
AI summary
A casing for the thermal management and protection of an electrochemical cell, the casing comprises a first material, an inner surface configured to be in physical contact with an electrochemical cell, wherein the inner surface is substantially solid at room temperature; and a polymer matrix dispersed within the first material and comprising two or more temperature management materials. At least one of the two or more temperature management materials comprise a phase change material having a latent heat of at least 5 Joules per gram and a transition temperature between 0° C. and 100° C., and an elastomeric material. The polymer matrix is substantially homogeneous, and in an environment where the electrochemical cell and a second electrochemical cell operate under the same charging and discharging conditions, the casing reduces a first operating temperature of the electrochemical cell by at least 10° C.