Electric Vehicle Maintenance

1. Product Definition

Electric vehicle (EV) maintenance refers to the systematic inspection, servicing, and component replacement carried out on battery electric vehicles (BEVs) according to stipulated schedules and service items. Although EVs do not feature traditional internal combustion engines and do not require engine oil or filter replacements, their core "three-electric system" (battery, electric motor, and electronic control) as well as the chassis, braking, and auxiliary systems still require periodic professional inspection and servicing to ensure vehicle performance, safety, and longevity. Proper maintenance can effectively improve driving range and lower breakdown rates.

2. Service Intervals

Compared to conventional petrol and diesel vehicles, EV service intervals are longer, and the required checklist items are far more streamlined.

• First Service: Usually performed within 5,000 km or 6 months of ownership, whichever comes first. The primary objective of the first service is a comprehensive inspection of the three-electric system and underbody chassis to ensure all components remain in optimal factory condition.

• Periodic Maintenance: Following the first service, BEVs are generally recommended to undergo scheduled servicing every 10,000 km or 1 year. Certain marques may alternate routine maintenance between Service A and Service B schedules. Service A (around every 5,000 km) focuses on general inspections covering the exterior, lighting, and tyres; Service B (around every 10,000 km) builds on this with comprehensive diagnostics on core components, including the three-electric system.

3. Core Maintenance Items

EV maintenance primarily revolves around two key areas: the "three-electric system" and routine wear-and-tear items.

(1) Three-Electric System Diagnostics (Maintenance Core)

• High-Voltage Battery System: The traction battery is the "heart" of an EV. During servicing, technicians use dedicated diagnostic tools to check the battery pack's State of Health (SOH), individual cell voltage balance, charging/discharging efficiency, and thermal management modules. The physical battery casing seal and mounting bolt torque are also inspected.

• Drive Motor System: Technicians inspect the drive motor casing for damage, check for abnormal noise or vibration during operation, and measure its electrical insulation resistance.

• Electronic Control System: Technicians run diagnostics on the Vehicle Control Unit (VCU), Battery Management System (BMS), and related software modules, applying essential firmware and software updates to optimise performance and rectify potential bugs.

• High-Voltage Wiring System: Periodic inspections of high-voltage wiring harnesses and orange connectors are carried out to detect ageing or wear and prevent short-circuit risks.

(2) Routine Service Items (Similar to ICE Vehicles but with Longer Intervals)

• Braking System: Thanks to regenerative braking, brake pad wear is significantly slower than on ICE vehicles. However, regular checks on brake pad thickness and brake fluid quality (typically recommended for replacement every 2 years) remain essential.

• Cooling System: An EV's battery pack, drive motor, and power electronics each rely on dedicated coolant circuits for heat dissipation. Regular checks on coolant levels and pipe sealing are necessary, with a full coolant replacement generally recommended every 40,000–60,000 km or 2–3 years.

• Single-Speed Reduction Gearbox: Given the instant torque and high rotational speeds of electric motors, the reduction gearbox handles substantial load. Replacing the reduction gear oil is recommended every 40,000 km or 2 years.

• Tyres and Chassis: Due to the heavier kerb weight of EVs, tyre wear can occur more rapidly. Periodic checks on tyre pressures, tread wear, and rubber ageing are necessary, alongside inspections of the chassis suspension, bushings, and steering linkages.

• Air Conditioning System: Regularly clean or replace the cabin air filter, and check refrigerant pressure levels and electric compressor operation.

• Other Fluids: Replace the brake fluid and reduction gear oil according to manufacturer intervals, and regularly inspect and top up the windscreen washer fluid.

4. Daily Usage and Maintenance Tips

• Smart Charging is Key: It is advisable to recharge promptly when the battery level drops to 20%–30% ; for daily use, prioritising AC slow charging helps preserve battery longevity. When leaving the vehicle parked for extended periods, keep the state of charge between 50% and 70% .

• Driving and Parking Habits: Avoid aggressive driving styles such as sudden hard acceleration and harsh braking. Park in shaded areas where possible, avoiding prolonged exposure to direct sunlight or DC fast charging in scorching weather.

• Choose Certified Workshops: As EVs feature high-voltage electrical architecture requiring specialised tools and expertise, it is strongly recommended to rely on authorised 3S/4S centres or certified EV service providers for maintenance.

• Do Not Jet-Wash the Front Compartment: When washing your car, avoid spraying high-pressure water directly into the front bonnet bay or charging port to prevent water ingress into high-voltage components, which could cause short circuits.

5. Summary

EV maintenance is far from complicated; its foundation lies in the systematic upkeep of the core three-electric system. Compared to conventional ICE vehicles, servicing involves fewer replacement parts, extended intervals, and typically lower ongoing running costs. However, it requires stricter technical compliance and professional expertise. Adhering to the owner's manual, cultivating healthy charging habits, and choosing authorised service centres are vital to ensuring your EV stays safe, reliable, and efficient over the long run.