I. 2026 Driving Forces: Dual Pressurefrom Safety and Range
As one of the heaviest non-sprung masses, the battery tray’s lightweighting is criticalfor reducing power consumption and extending range. The 2026 landscape is defined by two key shifts:
Stricter Regulations: The GB 38031-2025 standard elevates battery system safetyto a mandatory requirement, significantly raising the barfor heat resistance and bottom impact strength.
Integration Trend: The proliferationof CTC (Cell-to-Chassis) and CTB (Cell-to-Body) technologies transforms the battery tray from a mere “Protective Shell” into a structural body component. This poses new challengesfor stiffness and joining processes.
Against this backdrop, “Multi-material Hybridization” and “Monolithic Forming” have become the main themesof 2026 battery lightweighting.
II. Deep Dive: Four Mainstream Technology Roadmaps
Route 1: Aluminum Alloy — The “Kingof Cost-Effectiveness”
Market Status: Holds a 55%-60% share in the 2026 passenger car market; remains the absolute mainstream.
Core Advantages:
Mature Process: Extruded profiles combined with Friction Stir Welding (FSW) offer controlled costs and high yield rates, suitable for mass production.
Balanced Performance: Density is 1/3 that of steel, with excellent thermal conductivity aiding battery cooling.
Recyclability: Established scrap aluminum recycling systems align with OEM carbon footprint goals.
2026 Trend:
High-Strength Al Applications: Increased adoptionof 6xxx and 7xxx series high-strength alloys allowsfor thinner wall thickness while meeting crash requirements.
Gigacasting: Leading OEMs like Tesla and BYD utilize 6000T+ Die Casting Machines for monolithic tray forming, reducing part count by dozens and offering significant weight savings.
Applicable Scenarios: Mainstream A/B-Segment EVs, Plug-in Hybrids (PHEVs).
Route 2: Composites (SMC/CFRP) — The “Weight-Saving Artillery”
Market Status: Rapidly growing penetration, projectedto reach 15%-20% by 2030.
Core Advantages:
Extreme Lightweighting: 20%-30% lighter than aluminum, with superior specific strength.
Design Freedom: Enables monolithic integrationof burst valves and wire harness channels, reducing sealing interfaces.
Corrosion & Insulation: Eliminates electrochemical corrosion risks inherentto metal trays.
2026 Trend:
Thermoplastic Composites (TPC) Rise: TPC based on PP/PA matrices solves the recyclability issueof thermoset composites, with cycle times shortened to 3-5 minutes, enabling economic mass production.
Enhanced Flame Retardancy: V0-rated SMC becomes standardto meet new thermal runaway protection requirements.
Applicable Scenarios: Premium performance cars, weight-sensitive logistics vehicles, specialty vehicles.
Route 3: Magnesium Alloy — The “Underestimated Dark Horse”
Market Status: In a critical transition phasefrom interior parts to structural components, with per-vehicle usage exceeding 20kg.
Core Advantages:
Lowest Density (1.74g/cm³): 30% lighter than aluminum, making it theoretically the best metalfor weight reduction.
Superior Damping: Excellent damping capacity effectively buffers road vibrations.
2026 Trend:
Anti-Corrosion Breakthrough: New Micro-arc Oxidation (MAO) and composite coating technologies solve magnesium’s Achilles’ heel—corrosion.
Application Expansion: Extending from battery coversto the entire tray structure.
Challenges: Raw material price volatility, high-speed machining costs, and high-temp performance require further validation.
Applicable Scenarios: Battery covers and brackets for premium models (non-load bearing or semi-structural).
Route 4: Steel-Aluminum Hybrid — The “Conservative” Choice
Market Status: Still holds a niche in commercial vehicles, low-cost A0-Segment cars, and battery-swap models.
Core Advantages:
Lowest Cost: Material and stamping/welding costs are highly competitive.
Peak Strength: Ultra-high-strength steel (>1500MPa) offers natural advantagesin crash safety.
Weakness: Heaviest weight, severely restricting driving range.
2026 Trend: Adopting “High-Strength Steel Frame + Aluminum Bottom Plate” hybrid structures, retaining cost-effectivenessfor critical load paths while shedding weight elsewhere.
| Dimension | Aluminum Alloy | Composites | Magnesium Alloy | Steel-Al Hybrid |
| Weight Saving | ★★★★☆ (Good) | ★★★★★ (Excellent) | ★★★★★ (Optimal) | ★★☆☆☆ (Poor) |
| System Cost | ★★★★★ (Best) | ★★★☆☆ (Medium) | ★★☆☆☆ (High) | ★★★★★ (Best) |
| Maturity | ★★★★★ (Mature) | ★★★☆☆ (Growing) | ★★☆☆☆ (Low) | ★★★★★ (Mature) |
| Safety/Fire | ★★★★☆ (Good) | ★★★★☆ (Good) | ★★★☆☆ (Medium) | ★★★★★ (Excellent) |
| CTC Adaptability | ★★★★★ (Excellent) | ★★★★☆ (Good) | ★★★☆☆ (Medium) | ★★☆☆☆ (Poor) |
Selection Guide:
For Extreme Range & Performance (Premium EVs >€40k): Prioritize Composites or Magnesium Alloys (for covers).
For Mainstream Market (¥150k-250k Segment): Aluminum Alloy (including Gigacasting) remains the most cost-effective choice.
For Commercial/Battery-Swap: Steel-Aluminum Hybrid structures retain cost advantages.
I. Future Outlook: The “Vanishing” Tray in CTC Era
By 2026, lightweighting is not merely material substitution but structural dissolution. With the maturationof CTC/CTB:
Functional Integration: The battery cover merges with the vehicle floor, eliminating redundant “Tray-within-a-tray” structures for system-level weight reduction.
Process Revolution: Monolithic Die Casting integrates hundreds of parts into one, cutting weight by >20% and drastically reducing joining costs (welding/riveting).
Material Hybridization: A single material dominating the future is unlikely. “Aluminum Frames + Composite Base + Magnesium Cover” hybrid models will become m
ainstreamfor premium vehicles, achieving the optimal balanceof performance and cost.
V. Conclusion
The EV battery tray industry has entered the “Deep Water Zone” by 2026. Aluminum Alloy, backed by mature supply chains and balanced economics, remains the industry backbone. Composites and Magnesium Alloys, serving as differentiation weapons, will accelerate penetration in the premium segment. For OEMs, selecting a roadmap is no longer purely technical—it is a Strategic Decision based on brand positioning, cost modeling, and supply chain resilience. With the commercializationof solid-state batteries, requirements for casing pressure resistance and sealing will rewrite the rules again; the race for lightweighting is endless.
Data Source:China Societyof Automotive Engineers (SAE-China) “Energy Saving and New Energy Vehicle Lightweight Technology Roadmap 2.0”, 2026 Industry Research Reports.
Disclaimer:Data is based on 2026 industry forecasts. Specific technology selection requires engineering assessment based on platform architecture and supply chain realities.