Aluminum alloy die casting for energy storage liquid cooling enclosure: Grade selection + matching p
Time：2026-05-20 16:51:24 / Popularity： / Source：
Core requirements for energy storage liquid cooling enclosure: lightweight + high thermal conductivity + high airtightness + structural strength + corrosion resistance. Die casting route has core advantages of integrated molding, fewer parts, high production efficiency, is suitable for CTP/CTC/CTB and large-scale energy storage pack solutions. Following is a reference guide for grade selection, process compatibility, and corresponding images, balancing authoritative performance with mass production considerations.
I. Comparison of Core Die-Casting Aluminum Alloy Grades (For Energy Storage Liquid Cooling Housings)
| Grade | Core Components | Key Performance | Suitable Scenarios |
| ADC12 (YL113/A383) | Al-10-13Si-1.5-3.5Cu | Tensile strength ≥240MPa, thermal conductivity ≈150W/m·K, excellent fluidity | General-purpose energy storage housings, thin-walled complex structures, mass production |
| A380 (AlSi9Cu3) | Al-7.5-9.5Si-3-4Cu | Tensile strength ≥260MPa, high temperature resistance ≈150℃, excellent impact resistance | Medium to large-sized housings, load-bearing structural components, liquid cooling heat dissipation integrated components |
| A356 (AlSi7Mg0.3) | Al-6.5-7.5Si-0.25-0.45Mg | Tensile strength ≥250MPa after T6, elongation ≥10%, excellent corrosion resistance/weldability/thermal conductivity | High-tightness liquid-cooled enclosures, outdoor energy storage, parts requiring welding/heat treatment |
| 6061-T6 (Die-casting Modified) | Al-0.8-1.2Mg-0.4-0.8Si | Tensile strength ≥310MPa, top-tier weldability/corrosion resistance/strength | Ultra-large/high-strength enclosures, requiring friction stir welding/laser welding integration |
Core Selection Conclusions
Cost-effectiveness/Mass Production Priority: ADC12 (General Energy Storage, Indoor/Semi-Outdoor)
Strength/Heat Resistance Priority: A380 (Medium-to-Large Enclosures, Liquid Cooling Integration)
Airtightness/Corrosion Resistance/Outdoor Priority: A356 (T5/T6) (Liquid Cooling Channel Integration, Outdoor Energy Storage)
Ultra-Strength/Welding Priority: 6061-T6 (Die-casting Modified) (Large Energy Storage, CTC Integration)
Cost-effectiveness/Mass Production Priority: ADC12 (General Energy Storage, Indoor/Semi-Outdoor)
Strength/Heat Resistance Priority: A380 (Medium-to-Large Enclosures, Liquid Cooling Integration)
Airtightness/Corrosion Resistance/Outdoor Priority: A356 (T5/T6) (Liquid Cooling Channel Integration, Outdoor Energy Storage)
Ultra-Strength/Welding Priority: 6061-T6 (Die-casting Modified) (Large Energy Storage, CTC Integration)
II. Adaptable to the Entire Die-casting Process (Exclusively for Liquid Cooling Enclosures for Energy Storage)
1. Design and Simulation Pre-Design (Crucial! Determines Airtightness and Strength)
Wall Thickness Design: Uniform wall thickness 2.0-3.5mm, with gradual transition of local reinforcing ribs; minimum wall thickness ≥1.2mm (avoids insufficient filling); runner wall thickness ≥1.5mm (airtight core).
Structural Optimization: Topology optimization + MAGMA/ProCAST simulation; optimize gate/overflow/venting to avoid air entrapment and shrinkage cavities; integrated liquid-cooled runner, mounting bosses, and sealing grooves to reduce subsequent welding.
Mold Design: H13 hot work die steel (HRC48-52), multi-slider core pulling (adapts to complex runners), point cooling + thermal temperature control; mold temperature difference ±5℃.
2. Melting and Degassing (Porosity = Airtightness Killer)
Melting Temperature: 680-720℃ (closed-loop temperature control ±5℃), slightly higher for A356/6061 (700-720℃)
Degassing and Refining: Rotary jet argon/nitrogen, hydrogen content ≤0.1ml/100g; addition of Al-Ti-B refining agent to refine grains to below 15μm, improving elongation and airtightness
Alloy Control: ADC12/A380 strictly control Fe ≤1.3% (avoiding hard and brittle phases); A356 strictly control Fe ≤0.2% (ensuring toughness)
3. Die Casting Core Parameters (Grade-Specific Optimization)
Wall Thickness Design: Uniform wall thickness 2.0-3.5mm, with gradual transition of local reinforcing ribs; minimum wall thickness ≥1.2mm (avoids insufficient filling); runner wall thickness ≥1.5mm (airtight core).
Structural Optimization: Topology optimization + MAGMA/ProCAST simulation; optimize gate/overflow/venting to avoid air entrapment and shrinkage cavities; integrated liquid-cooled runner, mounting bosses, and sealing grooves to reduce subsequent welding.
Mold Design: H13 hot work die steel (HRC48-52), multi-slider core pulling (adapts to complex runners), point cooling + thermal temperature control; mold temperature difference ±5℃.
2. Melting and Degassing (Porosity = Airtightness Killer)
Melting Temperature: 680-720℃ (closed-loop temperature control ±5℃), slightly higher for A356/6061 (700-720℃)
Degassing and Refining: Rotary jet argon/nitrogen, hydrogen content ≤0.1ml/100g; addition of Al-Ti-B refining agent to refine grains to below 15μm, improving elongation and airtightness
Alloy Control: ADC12/A380 strictly control Fe ≤1.3% (avoiding hard and brittle phases); A356 strictly control Fe ≤0.2% (ensuring toughness)
3. Die Casting Core Parameters (Grade-Specific Optimization)
| Process Stage | ADC12/A380 | A356/6061 | Core Objectives |
| Mold Temperature | 180-220℃ | 220-250℃ | Reduce cold shuts/film sticking, improve mold filling |
| Slow Injection Speed | 0.1-0.3m/s | 0.2-0.5m/s | Smooth material ejection, avoid air entrapment |
| Fast Injection Speed | 3- 5 m/s | 2-4 m/s | Rapid filling, reducing turbulence |
| Pressure boosting | 80-120 MPa | 100-150 MPa | Compacting and densifying, improving airtightness |
| Pressure holding time | Wall thickness * 3-5 s | Wall thickness * 5-8 s | Eliminating shrinkage cavities, ensuring strength |
| Vacuum degree | ≤100 mbar | ≤50 mbar | Porosity <1%, airtightness meets standards |
4. Post-processing (Airtightness + Corrosion Resistance + Strength)
Finishing and rough machining: Gate/flash removal, shot peening (residual compressive stress ≥150MPa), CNC precision finishing of sealing grooves/mounting surfaces (accuracy CT4-6 grade)
Heat treatment (by grade)
ADC12/A380: T5 (artificial aging 150-170℃*4-6h), improving hardness and dimensional stability, avoiding full T6 (prone to deformation)
A356: T5 (170℃*6h) or Localized T6 treatment (solution treatment at 535℃ for 8 hours + water cooling + aging at 165℃ for 4.5 hours) to avoid overall T6 bubbling; 6061-T6: Standard T6 treatment for maximum strength.
Air tightness testing (core quality control):
Hydraulic pressure test: 1.5 times working pressure (≥1.6MPa) for 30 minutes, no leakage.
Air tightness test: SF6 tracer, leakage rate ≤6*10⁻⁵Pa·m³/s; or helium detection. Leakage rate ≤1*10⁻⁹Pa·m³/s (for liquid cooling channels)
Surface treatment (corrosion resistance + protection)
Outdoor/liquid-cooled environment: Micro-arc oxidation (MAO) (20-50μm ceramic layer, 5-8 times improvement in corrosion/wear resistance)
General environment: Anodizing + sealing (10-20μm), or powder coating (IP65 protection)
Welding surface: Retain original surface to avoid oxide layer affecting welding quality
5. Welding and Integration (Liquid Cooling Channels/Cover Plates)
Airtight Welding: Laser welding/CMT welding/Friction stir welding (6061/A356 preferred), welds free of porosity/cracks, secondary airtightness testing after welding.
Channel Integration: Die-cast integrated flow channels (preferred), or die-cast housing + brazed liquid cooling plate (3003/6061 liquid cooling plate), brazing temperature ≤590℃ (avoid A356 softening).
Finishing and rough machining: Gate/flash removal, shot peening (residual compressive stress ≥150MPa), CNC precision finishing of sealing grooves/mounting surfaces (accuracy CT4-6 grade)
Heat treatment (by grade)
ADC12/A380: T5 (artificial aging 150-170℃*4-6h), improving hardness and dimensional stability, avoiding full T6 (prone to deformation)
A356: T5 (170℃*6h) or Localized T6 treatment (solution treatment at 535℃ for 8 hours + water cooling + aging at 165℃ for 4.5 hours) to avoid overall T6 bubbling; 6061-T6: Standard T6 treatment for maximum strength.
Air tightness testing (core quality control):
Hydraulic pressure test: 1.5 times working pressure (≥1.6MPa) for 30 minutes, no leakage.
Air tightness test: SF6 tracer, leakage rate ≤6*10⁻⁵Pa·m³/s; or helium detection. Leakage rate ≤1*10⁻⁹Pa·m³/s (for liquid cooling channels)
Surface treatment (corrosion resistance + protection)
Outdoor/liquid-cooled environment: Micro-arc oxidation (MAO) (20-50μm ceramic layer, 5-8 times improvement in corrosion/wear resistance)
General environment: Anodizing + sealing (10-20μm), or powder coating (IP65 protection)
Welding surface: Retain original surface to avoid oxide layer affecting welding quality
5. Welding and Integration (Liquid Cooling Channels/Cover Plates)
Airtight Welding: Laser welding/CMT welding/Friction stir welding (6061/A356 preferred), welds free of porosity/cracks, secondary airtightness testing after welding.
Channel Integration: Die-cast integrated flow channels (preferred), or die-cast housing + brazed liquid cooling plate (3003/6061 liquid cooling plate), brazing temperature ≤590℃ (avoid A356 softening).
III. Summary and Selection Recommendations
Priority for Mass Production Cost-Effectiveness: ADC12 + Vacuum Die Casting + T5 + Anodizing (Indoor Energy Storage)
Priority for Strength/Heat Resistance: A380 + Pressure Die Casting + T5 + Powder Coating (Commercial and Industrial Energy Storage)
Priority for Airtightness/Corrosion Resistance: A356 + Vacuum Die Casting + T5 + MAO (Outdoor Energy Storage)
Priority for High Strength/Welding: 6061-T6 + Dedicated Die Casting + T6 + Friction Stir Welding (CTC Integrated)
Priority for Strength/Heat Resistance: A380 + Pressure Die Casting + T5 + Powder Coating (Commercial and Industrial Energy Storage)
Priority for Airtightness/Corrosion Resistance: A356 + Vacuum Die Casting + T5 + MAO (Outdoor Energy Storage)
Priority for High Strength/Welding: 6061-T6 + Dedicated Die Casting + T6 + Friction Stir Welding (CTC Integrated)
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