How to Optimize Cold Plates for EV Battery Cooling
APR 22, 20269 MIN READ
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EV Battery Thermal Management Background and Objectives
Electric vehicle battery thermal management has emerged as one of the most critical engineering challenges in the automotive industry's transition toward electrification. As EV adoption accelerates globally, the demand for high-performance, long-lasting battery systems has intensified the focus on effective thermal control solutions. Battery cells generate substantial heat during charging and discharging cycles, and maintaining optimal operating temperatures between 15-35°C is essential for preserving battery life, ensuring safety, and maximizing performance efficiency.
The evolution of EV battery thermal management began with simple air-cooling systems in early electric vehicles but quickly progressed to more sophisticated liquid cooling approaches as battery energy densities increased. Cold plate technology represents a significant advancement in this progression, offering direct thermal contact with battery cells through conductive heat transfer mechanisms. This approach has become increasingly prevalent in high-performance EVs and commercial applications where thermal management requirements are most demanding.
Current market drivers for optimized cold plate solutions include the automotive industry's push toward faster charging capabilities, higher energy density battery packs, and extended vehicle range requirements. These factors collectively create thermal challenges that exceed the capabilities of traditional cooling methods. The growing prevalence of 800V battery architectures and ultra-fast charging infrastructure further amplifies the need for advanced thermal management solutions capable of handling peak heat generation rates.
The primary objective of cold plate optimization centers on achieving maximum heat dissipation efficiency while minimizing system complexity, weight, and cost. This involves developing innovative channel geometries, advanced materials, and manufacturing processes that enhance heat transfer coefficients and reduce thermal resistance between battery cells and cooling medium. Secondary objectives include improving coolant flow distribution uniformity, reducing pressure drop penalties, and ensuring long-term reliability under automotive operating conditions.
Technical goals encompass achieving thermal uniformity across battery modules, preventing hot spot formation, and maintaining consistent cell temperatures during various operating scenarios including fast charging, high-power discharge, and extreme ambient conditions. The optimization process must also address manufacturing scalability, cost-effectiveness, and integration compatibility with existing battery pack designs while meeting stringent automotive safety and durability standards.
The evolution of EV battery thermal management began with simple air-cooling systems in early electric vehicles but quickly progressed to more sophisticated liquid cooling approaches as battery energy densities increased. Cold plate technology represents a significant advancement in this progression, offering direct thermal contact with battery cells through conductive heat transfer mechanisms. This approach has become increasingly prevalent in high-performance EVs and commercial applications where thermal management requirements are most demanding.
Current market drivers for optimized cold plate solutions include the automotive industry's push toward faster charging capabilities, higher energy density battery packs, and extended vehicle range requirements. These factors collectively create thermal challenges that exceed the capabilities of traditional cooling methods. The growing prevalence of 800V battery architectures and ultra-fast charging infrastructure further amplifies the need for advanced thermal management solutions capable of handling peak heat generation rates.
The primary objective of cold plate optimization centers on achieving maximum heat dissipation efficiency while minimizing system complexity, weight, and cost. This involves developing innovative channel geometries, advanced materials, and manufacturing processes that enhance heat transfer coefficients and reduce thermal resistance between battery cells and cooling medium. Secondary objectives include improving coolant flow distribution uniformity, reducing pressure drop penalties, and ensuring long-term reliability under automotive operating conditions.
Technical goals encompass achieving thermal uniformity across battery modules, preventing hot spot formation, and maintaining consistent cell temperatures during various operating scenarios including fast charging, high-power discharge, and extreme ambient conditions. The optimization process must also address manufacturing scalability, cost-effectiveness, and integration compatibility with existing battery pack designs while meeting stringent automotive safety and durability standards.
Market Demand for Advanced EV Battery Cooling Systems
The global electric vehicle market has experienced unprecedented growth, driving substantial demand for advanced battery thermal management systems. As EV adoption accelerates across major automotive markets, manufacturers face increasing pressure to develop more efficient cooling solutions that can handle higher energy densities while maintaining battery performance and longevity. The transition from air-cooled to liquid-cooled systems has become a critical requirement for next-generation EVs, particularly those targeting fast-charging capabilities and extended range performance.
Battery thermal management represents one of the most critical engineering challenges in modern EV development. Effective cooling systems directly impact battery life, charging speed, vehicle range, and overall safety performance. As battery pack energy densities continue to increase, traditional cooling methods prove insufficient for managing heat generation during high-power operations such as rapid acceleration and DC fast charging. This technological gap has created substantial market opportunities for advanced cooling solutions.
The automotive industry's shift toward higher-capacity battery packs and faster charging infrastructure has intensified requirements for sophisticated thermal management systems. Premium EV manufacturers increasingly specify liquid cooling systems as standard equipment, while mass-market producers evaluate cost-effective implementations. The growing prevalence of silicon carbide power electronics and high-voltage architectures further amplifies cooling system complexity and performance requirements.
Commercial vehicle electrification presents additional market expansion opportunities, as fleet operators prioritize battery longevity and operational efficiency. Heavy-duty applications generate significantly higher thermal loads compared to passenger vehicles, necessitating more robust cooling architectures. The emerging electric truck and bus segments demand proven thermal management solutions capable of supporting intensive duty cycles and extended operational periods.
Regional market dynamics vary considerably, with European and Chinese manufacturers leading adoption of advanced cooling technologies. Stringent emissions regulations and government incentives continue driving EV market penetration, while battery cost reductions make sophisticated thermal management systems more economically viable. The competitive landscape increasingly favors manufacturers capable of delivering integrated cooling solutions that optimize both performance and manufacturing efficiency.
Supply chain considerations have become increasingly important as automotive manufacturers seek reliable thermal management partners. The complexity of modern battery cooling systems requires specialized expertise in fluid dynamics, heat transfer optimization, and automotive-grade manufacturing processes. Market demand continues shifting toward suppliers capable of providing complete system integration rather than individual components.
Battery thermal management represents one of the most critical engineering challenges in modern EV development. Effective cooling systems directly impact battery life, charging speed, vehicle range, and overall safety performance. As battery pack energy densities continue to increase, traditional cooling methods prove insufficient for managing heat generation during high-power operations such as rapid acceleration and DC fast charging. This technological gap has created substantial market opportunities for advanced cooling solutions.
The automotive industry's shift toward higher-capacity battery packs and faster charging infrastructure has intensified requirements for sophisticated thermal management systems. Premium EV manufacturers increasingly specify liquid cooling systems as standard equipment, while mass-market producers evaluate cost-effective implementations. The growing prevalence of silicon carbide power electronics and high-voltage architectures further amplifies cooling system complexity and performance requirements.
Commercial vehicle electrification presents additional market expansion opportunities, as fleet operators prioritize battery longevity and operational efficiency. Heavy-duty applications generate significantly higher thermal loads compared to passenger vehicles, necessitating more robust cooling architectures. The emerging electric truck and bus segments demand proven thermal management solutions capable of supporting intensive duty cycles and extended operational periods.
Regional market dynamics vary considerably, with European and Chinese manufacturers leading adoption of advanced cooling technologies. Stringent emissions regulations and government incentives continue driving EV market penetration, while battery cost reductions make sophisticated thermal management systems more economically viable. The competitive landscape increasingly favors manufacturers capable of delivering integrated cooling solutions that optimize both performance and manufacturing efficiency.
Supply chain considerations have become increasingly important as automotive manufacturers seek reliable thermal management partners. The complexity of modern battery cooling systems requires specialized expertise in fluid dynamics, heat transfer optimization, and automotive-grade manufacturing processes. Market demand continues shifting toward suppliers capable of providing complete system integration rather than individual components.
Current Cold Plate Technology Status and Thermal Challenges
Cold plate technology for EV battery cooling has evolved significantly over the past decade, driven by the increasing demand for higher energy density batteries and more efficient thermal management systems. Current cold plate designs primarily utilize aluminum or copper substrates with integrated cooling channels that circulate coolant to extract heat from battery cells. The technology has progressed from simple serpentine channel designs to more sophisticated configurations including parallel channels, pin-fin structures, and micro-channel arrays.
The predominant cooling approach in today's market involves liquid cooling systems where cold plates are positioned beneath or between battery modules. These systems typically operate with water-glycol mixtures or specialized dielectric fluids, maintaining battery temperatures within the optimal range of 15-35°C during operation. Leading manufacturers have adopted standardized cold plate thicknesses ranging from 3-8mm to balance thermal performance with weight constraints.
Despite technological advances, several critical thermal challenges persist in current cold plate implementations. Temperature uniformity across the battery pack remains a significant concern, with temperature variations often exceeding 5°C between different cells. This non-uniformity leads to uneven aging, reduced capacity, and potential safety risks. The challenge is particularly pronounced in large format battery packs where thermal gradients can develop due to varying heat generation rates and coolant temperature rise along the flow path.
Heat flux density management presents another major challenge, especially during fast charging scenarios where battery cells can generate heat fluxes exceeding 5000 W/m². Current cold plate designs struggle to efficiently remove such high heat loads while maintaining acceptable pressure drops and pumping power requirements. The thermal interface between battery cells and cold plates also introduces significant thermal resistance, typically ranging from 0.1-0.5 K·cm²/W, which limits overall cooling effectiveness.
Manufacturing scalability and cost optimization remain persistent challenges for widespread cold plate adoption. Current production methods involving machined channels or brazed assemblies result in high manufacturing costs and limited design flexibility. Additionally, the integration of sensors and smart thermal management capabilities into cold plate structures presents ongoing technical hurdles that manufacturers are actively addressing through advanced materials and manufacturing processes.
The predominant cooling approach in today's market involves liquid cooling systems where cold plates are positioned beneath or between battery modules. These systems typically operate with water-glycol mixtures or specialized dielectric fluids, maintaining battery temperatures within the optimal range of 15-35°C during operation. Leading manufacturers have adopted standardized cold plate thicknesses ranging from 3-8mm to balance thermal performance with weight constraints.
Despite technological advances, several critical thermal challenges persist in current cold plate implementations. Temperature uniformity across the battery pack remains a significant concern, with temperature variations often exceeding 5°C between different cells. This non-uniformity leads to uneven aging, reduced capacity, and potential safety risks. The challenge is particularly pronounced in large format battery packs where thermal gradients can develop due to varying heat generation rates and coolant temperature rise along the flow path.
Heat flux density management presents another major challenge, especially during fast charging scenarios where battery cells can generate heat fluxes exceeding 5000 W/m². Current cold plate designs struggle to efficiently remove such high heat loads while maintaining acceptable pressure drops and pumping power requirements. The thermal interface between battery cells and cold plates also introduces significant thermal resistance, typically ranging from 0.1-0.5 K·cm²/W, which limits overall cooling effectiveness.
Manufacturing scalability and cost optimization remain persistent challenges for widespread cold plate adoption. Current production methods involving machined channels or brazed assemblies result in high manufacturing costs and limited design flexibility. Additionally, the integration of sensors and smart thermal management capabilities into cold plate structures presents ongoing technical hurdles that manufacturers are actively addressing through advanced materials and manufacturing processes.
Existing Cold Plate Design Solutions
01 Cold plate structural design optimization
Optimizing the structural design of cold plates can significantly enhance cooling performance. This includes modifications to the internal channel geometry, flow path configuration, and plate thickness to improve heat transfer efficiency. Design improvements may involve creating specific flow patterns, optimizing channel dimensions, and incorporating features that increase surface area contact. Advanced structural configurations can reduce thermal resistance and improve overall heat dissipation capabilities.- Cold plate structural design optimization: Optimizing the structural design of cold plates can significantly enhance cooling performance. This includes modifications to the internal channel geometry, flow path configurations, and plate thickness to improve heat transfer efficiency. Design improvements focus on maximizing surface area contact, reducing thermal resistance, and ensuring uniform temperature distribution across the cooling surface. Advanced structural features such as micro-channels, fin arrays, and optimized flow distributors contribute to enhanced thermal management capabilities.
- Enhanced heat transfer through surface modifications: Surface treatment and modification techniques can improve the heat transfer characteristics of cold plates. These methods include surface roughening, coating applications, and the integration of enhanced heat transfer surfaces. Such modifications increase the effective heat transfer area and promote turbulent flow conditions, leading to improved convective heat transfer coefficients. The implementation of these techniques results in more efficient thermal energy dissipation from heat-generating components.
- Coolant flow optimization and distribution: Proper coolant flow management is critical for maximizing cold plate cooling performance. This involves optimizing flow rates, pressure drops, and flow distribution patterns to ensure uniform cooling across the entire plate surface. Advanced flow distribution systems, including manifold designs and flow control mechanisms, help eliminate hot spots and improve overall thermal uniformity. Computational fluid dynamics analysis and experimental validation are used to determine optimal flow parameters for specific applications.
- Material selection for thermal conductivity enhancement: The choice of materials for cold plate construction directly impacts cooling performance. High thermal conductivity materials such as copper, aluminum alloys, and composite materials are selected to facilitate rapid heat transfer from the heat source to the coolant. Material properties including thermal conductivity, specific heat capacity, and corrosion resistance are considered in the selection process. Advanced materials and manufacturing techniques enable the production of cold plates with superior thermal performance characteristics.
- Integration of phase change and advanced cooling technologies: Advanced cooling technologies, including phase change cooling and hybrid cooling systems, can be integrated into cold plate designs to enhance performance. These systems leverage the latent heat of vaporization or utilize multiple cooling mechanisms simultaneously to achieve higher heat dissipation rates. The integration of such technologies allows cold plates to handle higher heat fluxes and maintain lower operating temperatures. These approaches are particularly beneficial for high-power density applications requiring exceptional thermal management capabilities.
02 Enhanced heat transfer through surface modifications
Surface modifications and treatments applied to cold plates can improve heat transfer characteristics. These modifications may include surface texturing, coating applications, or the integration of enhanced heat transfer features. Such treatments can increase the effective heat transfer area and improve thermal contact between the cold plate and the heat source. The modifications help to reduce thermal interface resistance and promote more efficient heat dissipation.Expand Specific Solutions03 Coolant flow management and distribution
Effective coolant flow management within cold plates is critical for optimal cooling performance. This involves designing inlet and outlet configurations, flow distribution manifolds, and internal flow channels that ensure uniform coolant distribution across the cooling surface. Proper flow management prevents hot spots, reduces pressure drops, and maximizes heat transfer efficiency. Advanced flow control mechanisms can adapt to varying thermal loads and operating conditions.Expand Specific Solutions04 Material selection and thermal conductivity enhancement
The selection of materials with high thermal conductivity is essential for improving cold plate cooling performance. This includes the use of advanced metals, alloys, or composite materials that offer superior heat transfer properties. Material choices may also consider factors such as weight, corrosion resistance, and manufacturing feasibility. Some designs incorporate multiple materials or thermal interface materials to optimize heat conduction from the source to the coolant.Expand Specific Solutions05 Integration with thermal management systems
Cold plates can be integrated into comprehensive thermal management systems to enhance overall cooling performance. This integration involves coordinating cold plate operation with other cooling components, control systems, and monitoring devices. System-level optimization considers factors such as coolant temperature regulation, flow rate control, and thermal load balancing. Advanced integration approaches may include smart control algorithms and real-time performance monitoring to maintain optimal cooling efficiency under varying operational conditions.Expand Specific Solutions
Key Players in EV Thermal Management Industry
The EV battery cooling cold plate optimization market represents a rapidly evolving competitive landscape driven by the accelerating electric vehicle adoption. The industry is in a growth phase with substantial market expansion as automakers like BYD, Great Wall Motor, BMW, and Rivian intensify their EV production. Technology maturity varies significantly across players, with established thermal management specialists like MAHLE International, Hanon Systems, and Valeo demonstrating advanced cooling solutions, while battery manufacturers such as Samsung SDI, LG Energy Solution, and CATL-affiliated companies integrate cooling technologies into their systems. Traditional automotive suppliers including Magna International, Lear Corp, and Gentherm leverage their manufacturing expertise to develop sophisticated thermal management systems. The competitive dynamics show a convergence of automotive OEMs, specialized thermal system providers, and battery manufacturers, indicating a maturing but still rapidly innovating market segment essential for EV performance optimization.
MAHLE International GmbH
Technical Solution: MAHLE's cold plate optimization approach focuses on integrated thermal management systems combining active and passive cooling elements. Their solutions feature modular cold plate designs with variable flow channel geometries that can be customized for different battery pack configurations. The company employs advanced CFD simulation and thermal modeling to optimize coolant flow distribution and heat transfer coefficients, incorporating phase change materials and enhanced surface area designs to improve cooling efficiency while reducing system complexity and weight.
Strengths: Comprehensive thermal management portfolio, advanced simulation capabilities, modular design flexibility. Weaknesses: Higher system complexity, potential cost implications for advanced materials.
Hanon Systems
Technical Solution: Hanon Systems develops advanced liquid cooling systems for EV batteries featuring optimized cold plate designs with enhanced heat transfer surfaces and integrated coolant distribution networks. Their cold plates utilize micro-channel technology with precisely engineered flow patterns to maximize heat dissipation efficiency while minimizing pressure drop. The company's thermal management solutions incorporate lightweight aluminum construction with specialized surface treatments to improve thermal conductivity and corrosion resistance for long-term reliability in automotive applications.
Strengths: Specialized automotive thermal management expertise, proven micro-channel technology, lightweight design optimization. Weaknesses: Limited integration with battery cell design, dependency on traditional cooling methods.
Core Innovations in Cold Plate Optimization Technologies
Thermal analysis on battery system for electric vehicle (battery cooling)
PatentInactiveIN202121056763A
Innovation
- Optimized cooling plate geometry with 7 channels, increased channel width, and turbulent flow analysis to enhance heat transfer efficiency, reducing pressure drop and maximizing coolant circulation, thereby improving temperature distribution within the battery module.
EV Safety Standards and Thermal Regulations
The regulatory landscape for electric vehicle battery thermal management is governed by a comprehensive framework of international and regional safety standards that directly impact cold plate design and optimization strategies. These standards establish critical thermal performance requirements, safety thresholds, and testing protocols that manufacturers must adhere to when developing battery cooling systems.
ISO 26262 serves as the foundational functional safety standard for automotive systems, requiring thermal management components to demonstrate fail-safe operation under various temperature scenarios. This standard mandates that cold plate systems incorporate redundant cooling pathways and temperature monitoring capabilities to prevent thermal runaway events. The standard also requires comprehensive hazard analysis and risk assessment for thermal management failures.
The UN ECE R100 regulation specifically addresses electric vehicle safety requirements, establishing maximum allowable battery cell temperatures and thermal gradient limits that cold plates must maintain. These regulations specify that battery pack temperatures should not exceed 60°C during normal operation, with temperature variations between cells limited to 5°C. Cold plate designs must demonstrate compliance through standardized thermal cycling tests and abuse scenario evaluations.
Regional regulations add additional complexity to cold plate optimization requirements. The European Union's UNECE-WP.29 framework emphasizes thermal propagation prevention, requiring cold plate systems to contain thermal events within individual battery modules. Similarly, the Chinese GB/T 31485 standard mandates specific thermal shock resistance capabilities for cooling components operating in extreme climate conditions.
Safety standards also dictate material selection and manufacturing processes for cold plate optimization. UL 2580 certification requires that all thermal interface materials and coolant fluids meet strict flammability and toxicity requirements. The standard prohibits certain refrigerants and mandates leak detection systems for liquid cooling circuits, directly influencing cold plate design parameters such as channel geometry and connection methods.
Testing protocols established by these regulations significantly impact optimization strategies. The SAE J2929 standard requires thermal management systems to undergo accelerated aging tests, vibration testing, and thermal shock evaluations. These requirements drive cold plate designs toward robust construction methods and conservative thermal performance margins, balancing optimization goals with regulatory compliance demands.
ISO 26262 serves as the foundational functional safety standard for automotive systems, requiring thermal management components to demonstrate fail-safe operation under various temperature scenarios. This standard mandates that cold plate systems incorporate redundant cooling pathways and temperature monitoring capabilities to prevent thermal runaway events. The standard also requires comprehensive hazard analysis and risk assessment for thermal management failures.
The UN ECE R100 regulation specifically addresses electric vehicle safety requirements, establishing maximum allowable battery cell temperatures and thermal gradient limits that cold plates must maintain. These regulations specify that battery pack temperatures should not exceed 60°C during normal operation, with temperature variations between cells limited to 5°C. Cold plate designs must demonstrate compliance through standardized thermal cycling tests and abuse scenario evaluations.
Regional regulations add additional complexity to cold plate optimization requirements. The European Union's UNECE-WP.29 framework emphasizes thermal propagation prevention, requiring cold plate systems to contain thermal events within individual battery modules. Similarly, the Chinese GB/T 31485 standard mandates specific thermal shock resistance capabilities for cooling components operating in extreme climate conditions.
Safety standards also dictate material selection and manufacturing processes for cold plate optimization. UL 2580 certification requires that all thermal interface materials and coolant fluids meet strict flammability and toxicity requirements. The standard prohibits certain refrigerants and mandates leak detection systems for liquid cooling circuits, directly influencing cold plate design parameters such as channel geometry and connection methods.
Testing protocols established by these regulations significantly impact optimization strategies. The SAE J2929 standard requires thermal management systems to undergo accelerated aging tests, vibration testing, and thermal shock evaluations. These requirements drive cold plate designs toward robust construction methods and conservative thermal performance margins, balancing optimization goals with regulatory compliance demands.
Sustainability Impact of Cold Plate Materials
The sustainability impact of cold plate materials in EV battery cooling systems has become a critical consideration as the automotive industry transitions toward environmental responsibility. Material selection directly influences the entire lifecycle environmental footprint, from raw material extraction through manufacturing, operation, and end-of-life disposal. Traditional aluminum cold plates, while offering excellent thermal conductivity and lightweight properties, present significant environmental challenges due to energy-intensive primary aluminum production processes that generate substantial carbon emissions.
Copper-based cold plates demonstrate superior thermal performance but carry even higher environmental costs during extraction and refining phases. The mining processes for copper ore typically involve extensive land disruption and water consumption, while the smelting operations require considerable energy input. However, copper's exceptional recyclability partially offsets these initial impacts, as recycled copper maintains nearly identical thermal properties while requiring only 15% of the energy needed for primary production.
Emerging composite materials and advanced alloys are reshaping the sustainability landscape for cold plate applications. Carbon fiber reinforced polymers offer reduced weight and manufacturing energy requirements, though their recyclability remains limited. Aluminum-silicon carbide composites provide enhanced thermal management capabilities while potentially reducing overall material usage through improved efficiency designs.
The manufacturing processes significantly influence environmental impact beyond raw material considerations. Additive manufacturing techniques for cold plate production can minimize material waste compared to traditional machining methods, though energy consumption during 3D printing processes varies considerably based on technology selection. Friction stir welding and other advanced joining techniques reduce the need for additional materials while improving thermal interface performance.
End-of-life considerations are increasingly driving material selection decisions. Aluminum cold plates demonstrate excellent recyclability with established recovery infrastructure, maintaining material value through multiple lifecycle iterations. Design for disassembly principles enable efficient separation of cold plate components from battery systems, facilitating material recovery and reducing landfill burden.
Lifecycle assessment methodologies reveal that material selection optimization can reduce cold plate environmental impact by 30-40% through strategic choices. The integration of recycled content, particularly in aluminum applications, substantially decreases carbon footprint while maintaining thermal performance requirements essential for effective battery cooling system operation.
Copper-based cold plates demonstrate superior thermal performance but carry even higher environmental costs during extraction and refining phases. The mining processes for copper ore typically involve extensive land disruption and water consumption, while the smelting operations require considerable energy input. However, copper's exceptional recyclability partially offsets these initial impacts, as recycled copper maintains nearly identical thermal properties while requiring only 15% of the energy needed for primary production.
Emerging composite materials and advanced alloys are reshaping the sustainability landscape for cold plate applications. Carbon fiber reinforced polymers offer reduced weight and manufacturing energy requirements, though their recyclability remains limited. Aluminum-silicon carbide composites provide enhanced thermal management capabilities while potentially reducing overall material usage through improved efficiency designs.
The manufacturing processes significantly influence environmental impact beyond raw material considerations. Additive manufacturing techniques for cold plate production can minimize material waste compared to traditional machining methods, though energy consumption during 3D printing processes varies considerably based on technology selection. Friction stir welding and other advanced joining techniques reduce the need for additional materials while improving thermal interface performance.
End-of-life considerations are increasingly driving material selection decisions. Aluminum cold plates demonstrate excellent recyclability with established recovery infrastructure, maintaining material value through multiple lifecycle iterations. Design for disassembly principles enable efficient separation of cold plate components from battery systems, facilitating material recovery and reducing landfill burden.
Lifecycle assessment methodologies reveal that material selection optimization can reduce cold plate environmental impact by 30-40% through strategic choices. The integration of recycled content, particularly in aluminum applications, substantially decreases carbon footprint while maintaining thermal performance requirements essential for effective battery cooling system operation.
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