1. Typical Applications of Finned Tubes in Battery Cooling Systems
(1) Liquid-Cooled Battery Systems
Working Principle:
Coolant (e.g., water-glycol mixture or refrigerant) flows through finned tubes, which enhance heat transfer by increasing the contact area with battery modules or cold plates.
Design Configurations:
Integrated Cold Plates: Finned tubes are embedded into metal (typically aluminum) cold plates, directly contacting the battery base.
Independent Heat Exchange Modules: Finned tubes paired with fans form standalone air-liquid hybrid cooling units.
(2) Phase Change Material (PCM) Hybrid Cooling
Enhanced Heat Dissipation:
Finned tubes are embedded in PCM (e.g., paraffin) to combine latent heat absorption with liquid cooling (ideal for high-rate discharge scenarios).
(3) Heating Function (Low-Temperature Environments)
Integrated Thermal Management:
Hot fluid or electrically heated coolant circulates through finned tubes to warm batteries (e.g., preheating in winter).
2. Key Technical Considerations & Challenges
(1) Material Selection
| Requirement | Recommended Material | Rationale |
|---|---|---|
| Lightweight | Aluminum alloy (6063-T5) | Low density, cost-effective |
| High Thermal Conductivity | Copper-aluminum composite | Copper core for heat transfer, aluminum fins for weight reduction |
| Corrosion Resistance | Stainless steel (316L) + coating | Prevents electrolytic corrosion in liquid cooling |
(2) Fin Design Optimization
Fin Geometry:
Serrated/Wavy Fins: Increase turbulence, improving heat transfer efficiency by 15–30% vs. flat fins.
Ultra-Thin Fins (0.1–0.3mm): For compact battery packs (requires anti-deformation design).
Fin Spacing:
Typically 1.5–3mm; narrower spacing risks clogging (dust mitigation needed).
(3) Manufacturing Requirements
Leakproof Performance:
High-frequency welding or brazing ensures no leakage (burst pressure ≥3MPa).
Dimensional Consistency:
Fin height tolerance ≤±0.05mm to avoid uneven contact and localized overheating.
(4) Thermal Validation
Critical Tests:
CFD simulation for flow distribution.
Infrared thermography to verify temperature uniformity (ΔT ≤5°C ideal).
3. Market-Specific Requirements for Export
(1) Regional Standards
| Market | Certifications | Special Needs |
|---|---|---|
| Europe | ISO 6469 (EV safety) | Eco-friendly materials (e.g., lead-free solder) |
| North America | SAE J2340 | Vibration resistance (e.g., fin抗震测试) |
| China | GB/T 34015 (Battery cooling) | Cost sensitivity; copper-aluminum preferred |
(2) Client-Specific Demands
Battery Manufacturers (e.g., CATL, LG):
Require thermal resistance data and cycle life reports (e.g., ≤5% performance decay after 2,000 thermal cycles).
Automakers (e.g., Tesla, BYD):
Focus on lightweighting (e.g., 10% weight reduction improves range) and modular designs (multi-vehicle compatibility).
