China Best Battery Liquid Cooling Pipe Supplier?

Evaluation Dimension	Common Material or Process	Relevant Technical Characteristics	Typical Manufacturing and Inspection Requirements	Application Considerations
Tube Material	Aluminum alloys, such as 3003 or 6063	Low density, good thermal conductivity, and good formability. Aluminum is widely used where low mass and efficient heat transfer are priorities.	Tube dimensional control, surface cleanliness, alloy verification, and leak testing should be established for each production lot.	Suitable for lightweight battery packs. Internal corrosion protection and coolant compatibility must be evaluated when the coolant contains water or glycol.
Tube Material	Austenitic stainless steel, such as 304L or 316L	High corrosion resistance, good mechanical strength, and good resistance to elevated temperature. Stainless steel generally has lower thermal conductivity than aluminum or copper.	Tube welding, annealing where required, weld-bead inspection, dimensional inspection, and pressure or helium leak testing are commonly used.	Appropriate for demanding corrosion environments or applications requiring higher mechanical robustness. The additional mass and lower thermal conductivity should be considered.
Tube Material	Copper, such as C11000 or C12200	Very high thermal conductivity and good formability. Copper is heavier and can require careful galvanic-corrosion control when joined to aluminum components.	Material certification, tube-wall inspection, brazed-joint quality control, cleanliness testing, and leak testing are important.	Useful where heat transfer is the primary requirement. Isolation coatings or compatible joining methods may be needed in mixed-metal assemblies.
Tube Material	Engineering polymers or multilayer polymer tubes	Low weight, electrical insulation, and good chemical resistance can be achieved with suitable polymer systems. Thermal conductivity is usually lower than that of metals.	Material batch control, dimensional stability, burst testing, permeation testing, coolant compatibility testing, and connector retention testing are required.	Suitable for electrically isolated routing and flexible connections. Temperature, pressure, permeation, aging, and flame-performance requirements must be defined.
Tube Geometry	Round, flattened, serpentine, or formed tube	Geometry influences coolant velocity, pressure drop, contact area, packaging efficiency, and local heat-transfer performance.	CNC bending, roll forming, hydroforming, or dedicated forming tools may be used. Final parts require checks for bend radius, flattening, twist, and deformation.	A flattened or serpentine tube can improve module contact and packaging efficiency, while a round tube may simplify joining and pressure management.
Manufacturing Process	Extrusion and drawing	Extrusion creates the basic aluminum or copper tube profile; drawing can improve dimensional accuracy, wall uniformity, and surface finish.	Process controls normally include die condition, drawing reduction, wall-thickness measurement, straightness, and surface-defect inspection.	Appropriate for repeatable tube profiles and higher-volume production. Tooling design should account for the required cross-section and bendability.
Manufacturing Process	Bending and three-dimensional forming	Produces routing paths that match battery-pack geometry and can reduce the number of joints and fittings.	Typical checks include bend angle, centerline radius, end position, ovality, wrinkling, cracking, and blockage of the coolant passage.	Proper tooling and bend-radius selection help prevent wall thinning and flow restriction, especially with thin-wall tubing.
Manufacturing Process	Laser welding, TIG welding, brazing, or controlled soldering	The joining method affects joint strength, heat-affected zones, cleanliness, corrosion resistance, and leak performance.	Weld parameters, joint preparation, shielding gas, filler material, and inspection criteria should be documented. Cross-section analysis may be used for process validation.	Laser welding supports precise, automated joints; brazing can join compatible dissimilar components but requires careful flux and residue control.
Connection Design	Quick connectors, bead-lock fittings, flared joints, or welded ports	Connections must maintain sealing performance under vibration, thermal cycling, pressure variation, and coolant exposure.	Recommended checks include insertion force, pull-out force, seal compression, dimensional fit, pressure cycling, and leak testing.	Connector material, elastomer selection, and electrical isolation should be compatible with the coolant, operating temperature, and service life.
Sealing System	EPDM, FKM, HNBR, or other coolant-compatible elastomers	Seal performance depends on temperature range, glycol concentration, additives, compression set, and exposure time.	Seal validation commonly includes immersion aging, compression-set testing, thermal cycling, pressure cycling, and post-aging leakage inspection.	The elastomer should be selected from coolant compatibility data rather than from temperature rating alone.
Surface Treatment	Cleaning, anodizing, conversion coating, or protective coating	Surface treatment can improve corrosion resistance, bonding performance, electrical isolation, or resistance to handling damage.	Cleanliness, coating thickness, adhesion, appearance, chemical resistance, and electrical insulation should be verified where applicable.	Internal surfaces must remain free from loose particles, oil, flux, and coating debris that could contaminate the coolant circuit.
Thermal Performance	Coolant flow rate, channel layout, and contact area	Cooling performance is governed by coolant properties, flow distribution, tube-wall resistance, contact resistance, and heat-source temperature.	Thermal testing should measure inlet and outlet temperatures, flow rate, pressure drop, and temperature uniformity under representative heat loads.	A design with high nominal heat-transfer capability may still perform poorly if flow is uneven or contact with the battery module is inconsistent.
Hydraulic Performance	Pressure drop and flow distribution	Pressure drop increases with tube length, bends, fittings, roughness, and flow rate. Parallel channels require balanced hydraulic resistance.	Flow-versus-pressure-drop curves should be established using the intended coolant and temperature range. Blockage and partial-flow conditions should also be assessed.	Lower pressure drop reduces pump power, while adequate flow velocity helps maintain heat-transfer performance and temperature uniformity.
Leak and Pressure Testing	Air-under-water, pressure decay, or helium leak testing	Leak testing verifies the integrity of tubes, welds, brazed joints, fittings, and seals. Test sensitivity depends on the selected method and equipment.	Test pressure, hold time, allowable leakage, test medium, and acceptance criteria must be defined in the product specification and production control plan.	The test method should represent the actual service risk and should not damage seals or deform thin-wall tubing.
Cleanliness Control	Flushing, filtered drying, and sealed packaging	Residual particles, oil, moisture, flux, and metal debris can restrict flow, contaminate coolant, or damage pumps and valves.	Controls may include particulate inspection, gravimetric residue testing, filtered flushing, moisture control, capped ports, and controlled packaging.	Cleanliness requirements should be defined by particle size, particle count, ionic residue, moisture level, and packaging duration where relevant.
Durability Validation	Thermal cycling, vibration, pressure cycling, and corrosion testing	Battery cooling pipes experience temperature changes, vibration, assembly loads, coolant exposure, and pressure fluctuations throughout their service life.	Validation plans commonly combine thermal cycling, vibration, pressure cycling, coolant aging, salt or environmental exposure, and post-test leak inspection.	Test limits should be based on the actual vehicle or energy-storage-system environment rather than on material properties alone.
Supplier Selection Criteria	Material traceability, process capability, and quality documentation	A capable supplier should demonstrate repeatable dimensions, stable joining processes, documented inspection, and controlled change management.	Important records include material certificates, process-control plans, inspection reports, leak-test records, capability studies, and corrective-action procedures.	The best supplier is not determined by material choice alone; design support, validation capacity, production consistency, and long-term serviceability are equally important.