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Custom liquid cold plates solutions

Context: From friction stir welding (fsw) to vacuum brazing. We engineer robust liquid cold plates that manage extreme heat loads for evs, igbts, and data centers.

  • Leak-proof guarantee: 100% air tightness tested.
  • Optimized thermal performance: Low pressure drop & high heat transfer efficiency.
  • Engineering expertise: Validated by thermal simulation & pressure analysis.
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What is a liquid cold plate?

At jindu, We specialize in “contact cooling.” Our cold plates utilize high-conductivity materials (copper/aluminum) and optimized internal flow paths to achieve heat dissipation efficiencies 5-10 times higher than air cooling. Whether for new energy vehicles (nevs) or 5g base stations, our solutions ensure your critical components stay within safe operating temperatures.

What is a liquid cold plate? As electronic devices shrink in size but grow in power, Traditional air cooling often hits its limit. A liquid cold plate is a high-efficiency heat exchanger that transfers heat from a heat source (like a battery or cpu) to a liquid coolant that flows through internal channels.

Our liquid cold plate manufacturing processes

At jindu, we specialize in high-performance liquid cooling solutions. We have invested in advanced manufacturing equipment—including friction stir welding (fsw) and brazing machines—to offer the optimal process for your specific thermal requirements, pressure limits, and budget.

Deep drilling process

This process involves drilling long, straight flow paths directly into a solid metal plate to create the cooling channels.

  • How It Works: We use specialized deep-hole drilling equipment to create precise channels within the plate, which are then sealed with plugs.
  • Key Advantage: It creates a robust, seamless structure with no bonding joints along the flow path, Minimizing the risk of leakage.
  • Best For: Applications requiring high reliability and structural strength with simple flow path geometries.

Brazing process (vacuum brazing)

Brazing is the premier choice for high-performance liquid cooling. We use a filler metal to join layers of the cold plate (and often internal fins) in a vacuum furnace.

  • How It Works: This process allows for complex internal structures, such as folded fins or skived fins inside the liquid channel, to maximize the heat transfer surface area.
  • Jindu Advantage:We have invested in specialized brazing technology to deliver compact, high-efficiency plates suitable for high-heat-flux components.
  • Best For: Military, Medical, and High-Performance Computing applications where thermal performance is critical.

Extrusion process

For cost-sensitive projects requiring mass production, we utilize extruded aluminum profiles to form the liquid channels..

  • How It Works: The cooling channels are formed directly during the extrusion of the aluminum profile. End caps or manifolds are then welded or brazed to direct the flow.
  • Key Advantage:  Extremely cost-effective for large volumes with consistent quality.
  • Best For:Standard industrial cooling and large-scale renewable energy applications.

FSW process (Friction stir welding)

Friction stir welding is a solid-state joining process that is critical for automotive and high-pressure applications.

  • How It Works:  A rotating tool mechanically mixes the metal of the base and the cover plate without melting them, creating a forged-quality joint.
  • Jindu Advantage: We are equipped with dedicated FSW machines and adhere to IATF 16949 standards. This ensures the mechanical strength and seal integrity required for EV battery packs and large inverters.
  • Best For: New Energy Vehicles (EV), large power electronics, and liquid cold plates requiring high structural integrity.

Copper tube process (tube embedded)

This is a reliable and cost-effective method that combines the thermal performance of copper with the lightweight properties of aluminum.

  • How It Works:  We machine precise channels into an aluminum base using our high-end CNC machines and press-fit copper tubes into them. The copper tube carries the coolant, while the aluminum acts as a mounting flange.
  • Key Advantage: The coolant only touches the copper tube, eliminating corrosion risks associated with aluminum. It offers a robust mechanical solution.
  • Best For: Power cabinets, rectifiers, and lasers where copper fluid paths are preferred.

Quality control in the manufacturing of liquid cooling plates

We strictly control every step from raw material selection to final delivery to ensure the highest thermal performance and reliability.

Material selection & preparation

Quality begins with the right materials. We rigorously select high-grade aluminum or copper alloys based on your thermal and mechanical requirements. This ensures an optimal balance between heat dissipation performance, weight, and cost. Once selected, materials undergo precision cutting to prepare for the machining phase.

Flow channel forming

Using advanced CNC machining, skiving, die-casting, or stamping technologies, we precisely shape the internal flow channels. For complex designs, we employ high-precision techniques to optimize the channel structure, ensuring maximum surface area for heat transfer and minimizing liquid flow resistance.

Pre-Bonding cleaning (Ultrasonic cleaning)

Before any joining process, parts undergo a rigorous multi-stage cleaning process. We remove all traces of oil, dust, and oxidation to ensure a pristine surface. This step is critical for achieving a flawless metallurgical bond during brazing or welding.



Surface treatment 

To enhance durability and aesthetics, we offer various surface treatments including anodizing, electroless nickel plating, and chromate passivation. These treatments significantly improve corrosion resistance and surface hardness, extending the product's lifespan even in harsh environments.

Air Leak testing & QC

Reliability is our priority. Every cold plate undergoes strict Air Tightness Testing,including hydrostatic proof pressure test (e.g., 1.5 MPa) . We test under high-pressure conditions to guarantee zero leakage and ensure stable operation in your liquid cooling system.

Final cleaning & inspection

After assembly and testing, a final rigorous cleaning process removes any residual particles or contaminants from the internal channels. We perform a final Flow Resistance & Particle Test to ensure the internal cleanliness meets the strictest industry standards before packaging and shipment.


Applications We Serve

Design Your Cold Plate

New energy vehicles (EV)

Battery pack cooling and on-board chargers (OBC).

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Power electronics

Cooling for IGBTs, Thyristors, and Inverters.

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Telecommunications

5G Remote Radio Units (RRU) and Base Station cooling.

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Medical devices

Precision temperature control for MRI and Laser equipment.

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Data centers

Liquid cooling for high-density Server Racks and AI Processors.


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How we design your liquid cold plate?

Engineering the perfect flow: Custom liquid cooling design designing a liquid cold plate requires balancing thermal performance with hydraulic pressure drop. Jindu’s technical team provides end-to-end design support.

Step 1: Flow path optimization

We design complex internal channels to ensure uniform temperature distribution across the contact surface. Our engineers calculate the optimal flow rate to minimize pressure drop while maximizing heat transfer.

Step 2: Thermal & hydraulic simulation

Using CFD (Computational Fluid Dynamics) software, we simulate the liquid flow and heat exchange process. This allows us to identify "hot spots" and "dead zones" in the design and correct them before prototyping.

Step 3: Structural integrity design

For FSW (Friction Stir Welding) plates, we design the joint geometry to withstand high internal pressures, ensuring the plate remains robust under the stress of EV battery packs or power electronics.

How we test liquid cold plates?

Zero leakage guarantee: Our testing protocol for liquid cooling, reliability is everything. Jindu performs comprehensive testing to prevent leakage and ensure safety.

Air tightness test

This is our most critical step. We perform 100% air tightness testing on every cold plate to detect even the microscopic leaks. We use high-pressure air or helium detection to guarantee the seal integrity of fsw and brazed joints.

Liquid pressure testing

We subject the plates to liquid pressure higher than the operating standard (burst pressure test) to ensure they can withstand system surges without failure.

hermal performance verification

We simulate the actual heat load and coolant flow rate in our lab to verify that the thermal resistance meets the design requirements.

Why trust Jindu with your liquid cooling?

Rigorous leak testing

Leakage is not an option. At Jindu, every single cold plate undergoes strict air tightness testing and pressure testing before shipment to guarantee reliability.

Thermal simulation & R&D

Don't guess your cooling performance. Our r&d team performs thermal simulation and flow analysis (cfd) to optimize channel geometry, minimizing pressure drop while maximizing heat transfer.

IATF 16949 certified

We adhere to the highest automotive quality standards, ensuring consistency from the first prototype to the 50,000th unit.

Advanced bonding tech

We utilize Friction Stir Welding (FSW) and Vacuum Brazing to create seamless, high-strength bonds. This ensures superior structural integrity and minimizes thermal resistance for optimal cooling.

High-precision CNC machining

Our CNC centers guarantee strict tolerances and exceptional surface flatness. This ensures perfect contact with heat sources, maximizing thermal conductivity and overall system stability.

End-to-End custom solutions

From DFM analysis and prototyping to mass production, we provide a full-cycle service. We streamline your supply chain to reduce time-to-market for your custom projects.

Faqs for liquid cold plates

FSW is typically more cost-effective for larger, simpler channels and offers superior mechanical strength. Brazing is better for compact plates requiring complex internal fins for maximum heat transfer. Contact our engineers for a recommendation.

Yes, we provide a complete assembly service, including installing connectors, fittings, and thermal interface materials (TIM).

With our extensive CNC and FSW equipment, we can handle large-format cold plates suitable for battery packs. Please send us your drawings for evaluation.

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