ISO 6469 Electrically Powered Road Vehicles - Safety Specifications

The “ISO 6469 Electrically powered road vehicles - Safety features” standard, published by the International Organization for Standardization (ISO), consists of the following sub-sections published under the same title:

• The standard “ISO 6469-1 Part 1: Rechargeable energy storage system (RESS)” describes the safety requirements for rechargeable energy storage systems (RESS) in electrically powered road vehicles for the protection of persons. This standard does not provide comprehensive safety information for manufacturing, maintenance, and repair personnel. Requirements for motorcycles and mopeds are set out in ISO 13063 and ISO 18243 standards. Additional safety requirements may apply to RESSs that can be charged in ways other than supplying electrical energy (e.g., redox flow batteries).

In an era where electric vehicles are revolutionizing transportation, rechargeable energy storage systems (RESS) that power them are at the heart of this transformation. These high-capacity batteries not only store enormous amounts of energy but also create unique safety challenges, from thermal runaway to electrical hazards. This is where the ISO 6469-1 standard comes into play, providing critical protection for electric vehicle owners, passengers, and the environment. This standard contains essential requirements to mitigate the risks associated with RESS in battery-electric vehicles, fuel cell vehicles, and hybrid electric vehicles.

ISO 6469-1 compliance involves a series of tests that blend simulation and real-world scenarios:

• Environmental testing: Exposure to extreme temperatures, humidity, and salt spray to simulate global driving conditions.
• Abuse tests: Simulated overvoltage, short circuits, and projectile impacts to evaluate failure modes.
• Functional verification: Ensuring the flawless operation of contactors, fuses, and monitoring systems.

Manufacturers often surpass requirements for a competitive advantage by integrating these into their development processes.

• The ISO 6469-2 Part 2: Vehicle operational safety standard describes the operational safety requirements specific to electrically powered road vehicles to protect persons inside and outside the vehicle. Relevant requirements for motorcycles and mopeds are described in the ISO 13063 standard. This standard does not provide comprehensive safety information for production, maintenance, and repair personnel. Furthermore, it does not address specific aspects of driving automation features.

The requirements specified in this standard must be met across the entire range of environmental and operating conditions for which the electrically powered vehicle is designed to operate, as specified by the vehicle manufacturer.

As electric vehicles dominate the automotive world, ensuring their safe operation is of paramount importance. While batteries are in the spotlight, it is the vehicle's daily functions that keep drivers, passengers, pedestrians, and the environment safe. The ISO 6469-2 standard is crucial in this respect.

The ISO 6469-2 standard mandates fail-to-safe designs for drive systems:

• Driving mode protections:
• Single-point fail-safe: No single fault (e.g., sensor/cable) will disable the drive system or braking.
• Drive system: Redundant controls ensure safe shutdown or emergency recovery in the event of a malfunction.
• Service brake integration: Electric vehicles must maintain braking even in the event of a high-voltage fault.
• External power security:
• Clear rules for connecting to chargers: Automatic disconnection in case of malfunction, feedback protection.
• Hazard reduction:
• Overcurrent / short circuit: Fuses / contactors instantly isolate faults.
• Warning systems: Audible/visual warnings for propulsion abnormalities.
• Post-malfunction status: The vehicle enters safe mode (e.g., low speed, no restart).
• The standard “ISO 6469-3 Part 3: Electrical safety” describes the electrical safety requirements for Class B voltage electrical circuits and conductive auxiliary electrical systems in electrically powered road vehicles. This standard specifies electrical safety requirements for the protection of persons against electric shock and thermal events. It does not provide comprehensive safety information for production, maintenance, and repair personnel. Electrical safety requirements after a collision are described in the ISO 6469-4 standard. Electrical safety requirements for conductive connections of electrically powered road vehicles to an external electrical power source are described in the ISO 17409 standard. Specific electrical safety requirements for magnetic field-free power transfer between an external electrical power source and an electrically powered vehicle are described in the ISO 19363 standard. Electrical safety requirements for motorcycles and mopeds are described in the ISO 13063 series of standards.

Electric vehicles possess immense power under the hood, or more precisely, in their high-voltage batteries and drive systems. However, great power comes with great risks: electric shock and thermal hazards that can endanger drivers, passengers, first responders, and bystanders. The ISO 6469-3 standard provides the necessary protections for Class B voltage circuits (up to 1.000 Volts AC or 1.500 Volts DC). This standard protects people inside and outside the vehicle during normal operation.

The ISO 6469-3 standard mandates double-layer protection: primary (direct contact) + fault (single fault). Targets are drive systems and conductively connected auxiliary systems.

• The standard “ISO 6469-4 Part 4: Electrical safety after an accident” describes the safety requirements for electrical drive systems and conductive auxiliary electrical systems of electrically powered road vehicles to protect persons inside and outside the vehicle. This standard specifies the electrical safety requirements for the post-collision conditions of the vehicle. It applies to electrically powered road vehicles with Class B voltage electrical circuits. It does not apply to motorcycles and mopeds. It does not specify any crash test procedures. The safety requirements of this standard apply to vehicles that comply with the published crash test procedures of each country or region. Applicable vehicles are those explicitly specified in these crash test procedures. It does not provide comprehensive safety information for first responders, emergency services, maintenance and repair personnel.

A collision at 96 km/h generates forces equivalent to a car falling from a five-story building. For internal combustion engine vehicles, the greatest post-accident fear is a fire resulting from exploding fuel lines. For electric vehicles, the threat is far more complex: high-voltage batteries, toxic electrolyte leaks, thermal runaways, and electric shocks to first responders and passengers.

The ISO 6469-4 standard ensures that an electric vehicle remains electrically safe for occupants, emergency crews, and the environment even after a severe collision. Since electric vehicle accident data shows a 25 times lower fire risk compared to internal combustion vehicles, this standard is a cornerstone of this safety record and a legal requirement in most global markets.

For many years, our organization, with its competent and experienced staff, has been understanding the needs of its clients, providing the advanced testing services they require, and assisting them in the establishment, implementation, and improvement of management systems. Within this framework, we also provide testing services to businesses in accordance with the "ISO 6469 Electrically powered road vehicles - Safety features" standard.