Cold plate

Definition

A cold plate is a thermal management component used in liquid cooling systems to remove heat directly from electronic, electrical, or mechanical equipment. Heat generated by a component is conducted into the cold plate, where a circulating coolant absorbs the thermal energy and transports it away from the heat source.

Cold plates are commonly used in high-density applications where conventional air cooling cannot efficiently dissipate the required thermal load.

Context

As computing power, battery capacity, and power electronics continue to increase, many applications generate more heat than traditional air cooling systems can effectively manage.

Liquid cooling technologies use cold plates to transfer heat directly from high-power components into a circulating coolant. This approach reduces thermal resistance, improves temperature stability, and supports higher equipment densities.

Cold plates are widely used in data centers, battery energy storage systems (BESS), edge data centers, industrial automation, and electric power systems where efficient thermal management is essential.

Technical insight

A cold plate operates by creating a direct thermal interface between the heat-generating component and a liquid cooling circuit.

The cooling process generally follows four stages:

1. Heat is generated by the component.
2. The heat is conducted into the cold plate.
3. Coolant flowing through internal channels absorbs the thermal energy.
4. The heated coolant is transported to a heat exchanger where the heat is removed before the coolant is recirculated.

Because liquids transport heat more efficiently than air, cold plates can remove significantly higher thermal loads while maintaining stable component temperatures.

A typical cold plate assembly includes:

• Metal base plate
• Internal coolant channels
• Coolant inlet and outlet connections
• Mounting interface
• Thermal interface material (TIM)

Materials and construction

Cold plates are commonly manufactured from aluminum or copper due to their high thermal conductivity.

The choice of material depends on factors such as:

• Heat transfer requirements
• Weight
• Corrosion resistance
• Manufacturing method
• Cost

Internal channel designs vary depending on the required cooling performance and pressure drop.

Cooling performance

Cold plates provide localized cooling by removing heat directly from critical components.

Compared with air cooling, this approach can:

• Improve temperature uniformity
• Reduce hotspots
• Support higher power densities
• Lower airflow requirements

Integration with liquid cooling systems

Cold plates are commonly integrated into:

• Liquid-to-air cooling systems
• Liquid-to-liquid cooling systems
• Coolant Distribution Units (CDUs)
• Glycol cooling systems

Together, these components create a complete liquid cooling infrastructure capable of supporting demanding applications.

Key advantages

• High heat removal capability
• Direct cooling of heat-generating components
• Improved temperature stability
• Reduced dependence on airflow
• Supports high-density equipment
• Scalable liquid cooling architecture

Applications

Cold plates are commonly used in:

Data centers and AI infrastructure

High-performance computing equipment uses cold plates to remove heat from processors, accelerators, and other high-power components.

Battery energy storage systems (BESS)

Battery systems use cold plates to maintain consistent cell temperatures and improve safety, performance, and lifespan.

Edge data centers

Compact edge facilities benefit from cold plates where equipment density exceeds the practical limits of air cooling.

Industrial automation

Industrial control systems, drives, and power electronics frequently use cold plates for reliable thermal management.

Power electronics

Rectifiers, inverters, converters, and other high-power equipment commonly rely on cold plates to manage thermal loads.

FAQ