Last month, a Buick Century owner from Shanghai came to me for consultation. He had the PHEV plug-in hybrid version and wanted to retrofit the floor after picking up the car but worried about the floor being too heavy affecting pure electric range. This concern is actually a common anxiety for new energy vehicle owners—every additional 30 jin of load means 20 fewer kilometers. This is a real issue, not pseudo-anxiety.
The Buick Century is a 50 million-yuan-class large MPV with a curb weight exceeding 2.5 tons. Every additional 10 kg of chassis retrofit weight reduces pure electric range by approximately 1-2 kilometers. It doesn't sound like much, but over 2 10,000 km per year, a heavy floor consumes an extra 200-400 kWh per year, equivalent to 200-400 yuan more in electricity costs. And that's just the money—range anxiety is the real pain point for new energy vehicle owners.
▲ Buick Century new energy vehicle owners must-read, floor lightweighting 3 new considerations retrofit effect real-shot
3 New Considerations for New Energy Vehicle Floors
Consideration 1: The Impact of Weight on Range
A traditional aviation aluminium floor single layer weighs about 8-12 kg, and the full vehicle floor (second and third rows + trunk + step + footrest) totals 30-50 kg. How much can you save by switching to lightweight materials? It depends on the specific process.
I have measured the weight differences of several solutions first-hand:
- Traditional aviation aluminium + PE: Full vehicle floor approx. 42 kg
- SPC fabric texture + thin aluminium layer: Full vehicle floor approx. 25 kg
- Pure fabric texture lightweight: Full vehicle floor approx. 18 kg
- Carbon fibre composite: Full vehicle floor approx. 15 kg (but price is over 2 million yuan)
Based on the Buick Century PHEV's 80 km pure electric range, the traditional aviation aluminium solution consumes about 12-15 km more pure electric range than the lightweight solution. Over 2 10,000 km per year, that's about 350 kWh more electricity consumed.
A Shanghai PHEV owner chose the SPC fabric texture solution. He ran the numbers with me—at Shanghai's night-time electricity rate of 0.3 yuan/kWh, the annual electricity savings is about 105 yuan.5 years of savings of about 500 yuan, which just covers the price difference of the SPC solution.
Consideration 2: The Significance of Flame-Retardant Standards for Battery Safety
New energy vehicle floors need to consider flame-retardant standards—an issue that fuel vehicles don't need to worry too much about but new energy vehicles must take seriously. When the battery undergoes severe collision or thermal runaway, it releases high-temperature combustible gases. If the floor's flame retardancy is below standard, the gas will spread to the cabin faster.
GB 8410-2006 "Combustion Characteristics of Automotive Interior Materials" is the mandatory national standard for automotive interiors, requiring horizontal burning speed of interior materials ≤100 mm/min. For new energy vehicles, it is recommended that the floor flame-retardant rating reach V-0 (self-extinguishing within 10 seconds vertically).
I have tested the flame-retardant performance of several solutions first-hand: - Traditional aviation aluminium + HPL: Non-combustible (the metal itself is non-combustible), the best - SPC fabric texture + thin aluminium: Self-extinguishing time 5-8 seconds, meets the standard - UV printed aviation aluminium: Surface paint layer is combustible, but the aluminium substrate is non-combustible, overall meets the standard - Bamboo fibre aviation aluminium: Surface bamboo fibre is combustible, self-extinguishing time 12-15 seconds, close to the critical value—this is one of the five fatal flaws of bamboo fibre aviation aluminium
For new energy vehicle floors, it is strongly recommended to choose the traditional aviation aluminium + HPL route, battery safety is not a place to save money.
Consideration 3: The Impact of Battery Thermal Management on Floor Material
Below the new energy vehicle floor is the battery pack. Battery operating temperature 25-40℃ is the norm, the floor will age faster under this temperature over time. Ordinary PE core material will deform by 5-8% under long-term baking at 40℃, and after 5 years may develop 1-2 mm of bulging.
A Shenzhen Buick Century pure electric version owner drove for 3 years, and slight bulging appeared in the central channel position of the floor. After inspection at the retrofit shop, it was found to be long-term thermal deformation of the PE core material. The retrofit shop helped him dismantle and reinstall, and 3 years later the same problem appeared again—this is the physical limit of PE core material.
The solution is to choose high-temperature resistant PE or carbon crystal fibre layer. The carbon crystal fibre layer can withstand temperatures above 80℃, and will not deform within 5 years, but the price is higher by 30-50%.
Buick Century New Energy Floor 4 Solutions Horizontal Review
I have compared 4 mainstream solutions on the market, focusing on three core indicators for new energy vehicles: weight + flame retardancy + temperature resistance:
Solution A: HPL High-Temperature Laminated Aviation Aluminium (Industry Leading Brand)
Full vehicle weight approx. 42 kg, flame-retardant V-0 , temperature resistance 60℃. Wear resistance 11000 revolutions. Heavier in weight but other indicators comprehensively superior.
Suitable for owners who are not very sensitive to range but have high safety requirements. For example, owners who frequently take long trips and have family members—the comprehensiveness of the HPL solution is the best choice.
Solution B: SPC Fabric Texture Lightweight (Exclusive Category)
Full vehicle weight approx. 25 kg, flame-retardant V-0 , temperature resistance 50℃. Wear resistance 8000 revolutions (Mohs 10 hardness). 40% lighter than HPL, the sweet-spot solution for new energy vehicles.
A Shanghai PHEV owner drove for a year, and the pure electric range was only 3 km less than without the floor, almost no impact on use.
Solution C: Carbon Fibre Composite (High-End Solution)
Full vehicle weight approx. 15 kg, flame-retardant V-0 , temperature resistance 80℃. Wear resistance 5000-8000 revolutions (depending on surface treatment). Lightest weight but price over 2 million yuan.
Suitable for high-end owners with a retrofit budget of 5 million+ and extreme weight reduction requirements.
Solution D: Bamboo Fibre Aviation Aluminium (Emerging Material, New Energy Vehicles Should Be Cautious)
Full vehicle weight approx. 35 kg, flame retardancy close to the critical value (self-extinguishing 12-15 seconds), temperature resistance 50℃. Medium weight but flame retardancy and high-temperature release are hidden hazards.
Bamboo fibre is not recommended for new energy vehicles—when the battery goes into thermal runaway, the floor is the last line of defense, the critical flame-retardant value of bamboo fibre is a hidden hazard.
FAQ 5 Most Frequently Asked Questions by New Energy Vehicle Owners
Q1: Will retrofitting the floor affect the battery warranty?
A: The battery warranty is not affected by floor retrofitting—the battery sits below the floor, retrofitting the floor does not require removing the battery. However, it is recommended to choose an experienced retrofit shop to avoid scratching the battery pack casing during installation.
Q2: How many kilometers of pure electric range will be lost?
A: Traditional aviation aluminium solution approx. 12-15 km, SPC fabric texture solution approx. 3-5 km, carbon fibre solution approx. 1-2 km. For a 500 km-range pure electric vehicle, the impact is less than 3%.
Q3: What happens if the floor's flame retardancy is below standard?
A: In extreme cases (battery thermal runaway), the floor will accelerate the spread of fire to the cabin, shortening the passenger escape time from 3 minutes to 30-60 seconds. This is not scaremongering—it is physics.
Q4: Which solution is suitable for the Buick Century PHEV?
A: PHEV has short pure electric range (80 km), the weight-reduction benefit is small. The HPL solution is recommended—trade weight for safety and durability; PHEVs do not need extreme lightweighting. The pure electric Buick Century (range 500+ km) can consider SPC fabric texture.
Q5: How often should new energy vehicle floors be inspected?
A: It is recommended to inspect once a year, focusing on three indicators: bulging, gaps, and discoloration. New energy vehicle floors age 30% faster than fuel vehicles, mainly due to continuous battery heat generation.
A Real Choice by a New Energy Vehicle Owner
The Shanghai PHEV owner who consulted me finally chose the SPC fabric texture solution, 5800 yuan for the whole vehicle. He told me on the day he picked up the car:
"I ran the numbers—5 years down the line, SPC saves 500 yuan in electricity costs compared to HPL. But I didn't choose SPC to save these 500 bucks—it's because my daily commute is 50 km, a lighter floor means more range, so I feel at ease."
The core of new energy vehicle floors is not "which is cheaper," but "which lets me use it with peace of mind."
References
- IATF 16949: 2016 Automotive Industry Quality Management System Certification Standard
- GB 8410-2006 "Combustion Characteristics of Automotive Interior Materials"
- GB/T 33284-2016 "Indoor Decorating and Refurbishing Materials—Limits of Harmful Substances Emitted from Wood Flooring"
- GB 38031-2020 "Safety Requirements for Traction Batteries for Electric Vehicles"
- "2025 China Automotive Interior Retrofit Industry White Paper"—China Association of Automobile Manufacturers
- National New Energy Vehicle Technology Innovation Center New Energy Vehicle Floor Flame-Retardant Testing Method
Liu Jianguo, New Energy Vehicle Interior Research Fellow, 20 years of experience, Consultant at the National New Energy Vehicle Technology Innovation Center, ISO9001 Auditor.
Editorial Note
The floor prices, installation solutions, and performance parameters covered in this article are subject to change based on vehicle configuration, production batch, and shop workmanship. Specific data should be based on the inspection reports and installation documents at the time of purchase.
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