Automotive Thermal Management Architecture

Custom 2-Layer TPV Tube Extrusion Line For Battery Cooling Application

Industrial-grade precision co-extrusion technology engineered for EV battery thermal management, liquid-cooled pack manifolds, and high-integrity elastomer cooling ducts.

Product Catalog · Tier 1

Precision Extrusion Production Platforms

High-speed, multi-layer, and profile extrusion lines designed for demanding engineering polymers and tight tolerance industrial profiles.

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Custom Precise Traverse Displacement Auto-Spool Changing Coiling Machine Factories, Products

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China PA PE PP PVC High Speed Single Wall Corrugated Pipe Extrusion Line

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Engineering Whitepaper

Technological Shift: TPV Co-Extrusion in EV Thermal Management

Why Tier-1 automotive thermal systems are abandoning traditional EPDM vulcanization in favor of continuous 2-layer co-extruded Thermoplastic Vulcanizates (TPV).

In electric vehicles (EVs), hybrid platforms, and energy storage systems (ESS), the thermal management loop is critical not only for passenger cabin comfort, but for lithium-ion cell safety, operating longevity, and fast-charging capability. For decades, ethylene propylene diene monomer (EPDM) was the incumbent standard for coolant plumbing. However, the electric mobility revolution dictates an aggressive transformation driven by three critical technical imperatives: mass reduction (lightweighting), mechanical flexibility in compact pack spaces, and elimination of cure residues that pollute sensitive liquid-cooling channels.

Thermoplastic Vulcanizate (TPV) Functional Advantage

TPV combines the dynamic vulcanization of EPDM within a continuous polyolefin matrix (PP). A dedicated 2-Layer TPV Tube Extrusion Line enables the co-extrusion of differentiated functional layers: an inner liner optimized for water-glycol chemical inertness and low friction, combined with an outer protective shell compounded for exceptional mechanical pinch resistance, ozone degradation resistance, and flame retardancy.

The manufacturing process developed by Jiangsu Baodie Automation Equipment Co., Ltd. (BAOD EXTRUSION) resolves the historical challenges associated with multi-layer elastomer co-extrusion: laminar shear instability, interfacial delamination between structural layers, and longitudinal wall variations caused by pulsing melt pumps. Operating at high line velocities while preserving strict roundness tolerances (±0.05 mm) is now achievable through synchronized melt control algorithms.

Weight Reduction of 35%

TPV possesses a density near 0.90 to 0.97 g/cm³, whereas cured EPDM density generally reaches 1.2 to 1.3 g/cm³. The co-extruded thin-wall geometry trims kilograms off the vehicle chassis harness.

Zero Plasticizer Migration

Unlike vulcanized rubber hose systems, multi-layer TPV tubing does not require sulfur curing, oil-based plasticizers, or talcum anti-adhesion powders, avoiding cooling plate clogging.

100% Closed-Loop Recyclability

Scrap generated during changeovers or end-of-life battery recycling is completely melt-reprocessable, meeting the strictest EU End-of-Life Vehicle (ELV) directives.

Precision Hardware Stack

Engineered Co-Extrusion System Architecture

From plasticizing rheology to multi-axis ultrasonic monitoring: how BAOD builds turn-key process control for mission-critical automotive tubing.

System Module Engineering Specification Technological Functionality Quality Impact on Tubing
Primary & Satellite Extruders L/D 28:1 to 32:1 Nitrided Bimetallic Screws Dynamic shearing with minimal thermal degradation of elastomer phase Prevents elastomer gel aggregation; delivers steady output ±0.2%
Co-Extrusion Crosshead Spiral Mandrel or Radial Die Flow Design Equalized velocity vectors across both inner and outer annular melt pathways Eliminates knit lines; guarantees uniform layer bonding without adhesives
Vacuum Sizing & Cooling 304 Stainless Dual-Chamber Multi-Stage Tank Automated negative pressure regulation (±0.1 kPa) with fine jet spray cooling Controls thermal shrinkage, prevents out-of-round ovality under vacuum
Servo Haul-Off Puller TKB High-Speed Synchronous Timing Belt Zero-slip servo pull with micron-level digital line sync Eliminates wall stretching and surface marking on soft elastomer matrices
Online Metrology & QC Dual-Plane Laser OD + Multi-point Ultrasonic Gauges Continuous real-time sampling (1000 Hz) with closed-loop puller feedback Automated scrap rejection and 100% statistical process documentation

Interfacial Integrity

Optimized polymer melt temperature profiles promote genuine molecular entanglement at the two-layer interface, delivering peel strength exceeding parent material yield.

Hydrolytic Resistance

Inner layer formulations are customized to resist ethylene glycol degradation at sustained high temperatures (+125°C) without stress cracking or polymer erosion.

Low Permeation Barrier

Configurable for EV coolant loops to suppress moisture evaporation and ingress, ensuring coolant conductivity remains low for maximum electrical safety.

Dynamic Flex Longevity

Tubing maintains its dynamic elastomeric recovery without setting under sustained vibration and extreme low temperatures (-40°C vehicle testing).

Operational Superiority

China Factory Advantage: Engineering Heritage & Cost-Efficiency

Integrating 25 years of Taiwan precision tooling roots with high-volume smart manufacturing in Jiangsu.

In the procurement of high-performance extrusion equipment, global manufacturers are often forced to choose between premium European machinery with multi-month lead times and exorbitant price tags, or sub-standard local alternatives with erratic stability. BAOD EXTRUSION bridges this gap completely.

Beginning in Taiwan with Kingswel Group in 1981, transferring industrial fabrication to Shanghai in 1999, and centralizing high-end operations into a dedicated 16,000 m² campus in Haian, Jiangsu, BAOD provides an unmatched value equation. China's mature component ecosystem—combined with BAOD's internal CNC precision machining—delivers world-class extrusion lines with 40-50% operational cost savings and fast commissioning timelines.

25+
Years Industry Experience
16,000 m²
Modern Manufacturing Base
±0.02 mm
Tooling Machining Accuracy
100+
Precision Extrusion Engineers
Application Engineering

Application Scenarios & Macro Solutions

How BAOD 2-layer co-extrusion technology adapts across localized EV battery layouts and global manufacturing ecosystems.

Cell-to-Pack (CTP) Cooling Lines

Ultra-compact structural dimensions require flexible, tight-radius routing. 2-layer TPV tubes prevent kink-collapse when installed within high-density prismatic or blade battery enclosures.

Quick-Connector Interfacing Ducts

Automotive thermal manifolds utilize standardized push-fit or barbed connectors. The extrusion line maintains micron-level internal diameter concentricity, guaranteeing leak-free sealing under high pulse pressure.

Heavy Commercial & Megawatt BESS

Utility-scale Battery Energy Storage Systems (BESS) require decades of continuous cooling loop circulation. BAOD lines produce heavy-duty TPV cooling conduits with long-term thermo-oxidative stability.

Procurement Requirements of Global Tier-1 Suppliers

Multinational tier suppliers (serving OEMs such as Tesla, BYD, Volkswagen, BMW, and Hyundai) impose stringent production prerequisites during technical audits. BAOD lines are specifically structured around these procurement mandates:

Full Industry 4.0 SCADA Integration

Every extrusion parameter—melt temperature, screw torque, haul-off tension, vacuum levels, and wall thickness distributions—is logged over OPC-UA protocols for digital batch traceability.

Accelerated Mold & Die Swapping

Modular die head designs with pre-heated quick-clamping configurations allow operators to change between tube specifications (e.g., 8mm to 25mm OD) with minimal transition downtime.

Worldwide Remote Tele-Diagnostics

Embedded secure VPN routers allow Jiangsu Baodie’s core automation engineers to troubleshoot servo logic, PID calibration, and software routines remotely across Europe, North America, and Southeast Asia.

Product Catalog · Tier 2

Downstream & Specialized Extrusion Equipment

Autonomous pulling, precision calibration tanks, and compound profiles engineered to complete turnkey production facilities.

Knowledge Base

Frequently Asked Technical Questions

Key engineering inquiries from procurement specialists and extrusion plant managers.

What are the key technical advantages of 2-layer co-extruded TPV over single-layer TPV in cooling applications?
A single-layer TPV formulation must compromise between cost, chemical resistance to hot water-glycol, mechanical durability, and surface friction. A 2-layer co-extruded construction decouples these requirements. The inner layer is formulated with specialized crosslinked EPDM/PP compounds optimized for low permeation, superior hydrolysis resistance, and a smooth bore that minimizes fluid drag. The outer layer utilizes high-abrasion, flame-retardant, and UV-resistant compounding. This architecture delivers optimal operational lifespan while reducing overall raw material costs.
How does BAOD prevent delamination between the two TPV layers without external adhesives?
Interfacial adhesion depends on polymer rheological compatibility and thermal fusion inside our co-extrusion die crosshead. BAOD utilizes custom spiral mandrel geometry where both melt streams converge under tightly calculated compression zones while still in their molten state. By matching shear rates, viscosity curves, and melt contact points precisely before the calibration die orifice, co-crystallization and chain entanglement occur automatically across the interface, ensuring permanent structural bonding that easily passes automotive burst and pressure pulse testing.
What line speeds and tolerance controls are typically achieved on automotive cooling tubing?
Depending on tubing dimensions (commonly 12 mm to 22 mm OD for battery coolant manifolds), BAOD 2-Layer TPV Extrusion Lines operate reliably at production speeds ranging from 15 to 45 meters per minute. Dimensional tolerances are held consistently within ±0.05 mm on outer diameter and ±0.03 mm on wall thickness. This precision is maintained by integrating real-time ultrasonic wall thickness scanners with closed-loop feedback directly tied to servo puller speeds and melt pump volume controls.
Can this extrusion line handle other automotive polymers such as PA11, PA12, or TPU?
Yes. The platform is modular. While optimized for TPV/PP formulations, with dedicated screw geometry adjustments and barrel temperature parameter updates, the extrusion hardware can co-extrude multi-layer PA (polyamide) fuel and vapor lines, TPU/TPV composite lines, or single-wall corrugated protection conduit. Our engineering team supplies interchangeable screws and die bushings tailored specifically to the rheological melt behavior of target polymer grades.
What testing and factory acceptance trial (FAT) protocols does BAOD offer before global export?
Prior to shipping from our Haian, Jiangsu manufacturing facility, we conduct comprehensive 48-hour continuous running trials. Customers are encouraged to provide their proprietary resin pellets. We test under simulated factory loads, verifying wall thickness uniformity, ovality, layer distribution via micro-sectioning, surface quality, and synchronization of downstream automated fly-knife cutters or spoolers. Complete Cpk capability reports and mechanical inspection certificates are supplied alongside CE conformity documentation.