HVIL Harness

HVIL Harness

High Voltage Inter-lock (HVIL), also called Hazardous Voltage Interlock Loop.

HVIL, or High Voltage Interlock Loop, is a safety feature in hybrid and fully electric vehicles that protects personnel during vehicle assembly, repair, maintenance and operation.

HVIL systems are designed to protect anyone who may come into contact with high-voltage components at any stage of an electric vehicle’s life cycle.

Gas-powered vehicles do not require HVIL because their electrical systems operate at low voltages, posing no risk to operators and service technicians. But hybrid and electric vehicles include subsystems of batteries, wiring, adapters and controllers that operate at higher power levels and therefore require additional safety features.

The HVIL acts as a circuit breaker and sends an alert or fault code to the driver if a high-voltage connection becomes loose, disconnected, or damaged while the vehicle is operating. HVIL also helps protect the driver and passengers of a vehicle in the event of an accident.

High-voltage interlocking refers to a safety design method that uses low-voltage signals to monitor the integrity of high-voltage circuits. By using low-voltage signals to check all components connected to the high-voltage wiring harness on the electric vehicle, the integrity and continuity of the electrical connections of each high-voltage system loop are detected.

The role of HVIL Harness

1.Before the vehicle is powered on, if it is detected that the circuit is incomplete, the system cannot be powered on to avoid accidents caused by problems such as virtual connections.

2. Prevent safety accidents caused by human error. During the operation of the high-voltage system, if there is no high-voltage interlock design, the high-voltage connection point is manually disconnected. At the moment of disconnection, the entire circuit voltage will be applied to both ends of the breakpoint. The voltage breaks through the air and draws an arc between the two devices. Although the time is short, the energy is very high, which may cause harm to people and equipment around the breakpoint. cause some damages.

3.Detect the looseness of the high-voltage circuit (which will cause high-voltage power outage and the vehicle to lose power, affecting ride safety) and provide alarm information to the vehicle controller before the high-voltage power outage, allowing time for the vehicle system to take countermeasures.

Product Description

The Benefits of Using a Power Battery Wiring Harness in an Electric Vehicle Include

Safety:The power battery wiring harness is designed to meet the strict safety standards for electric vehicles.

Performance:The power battery wiring harness is designed to withstand the high voltage and current demands of the vehicle's electrical components.

Range:The power battery wiring harness helps to improve the range of the electric vehicle by reducing the amount of energy lost in the electrical system.

Application fields of HVIL harness: new energy vehicles, industrial energy storage, home energy storage, aircraft, ships and other fields.

How is the HVIL Harness Implemented in Electric Vehicles?

The implementation of the HVIL harness involves careful integration into the electric vehicle's architecture. The harness is strategically connected to key high-voltage components, forming a closed loop. The inclusion of sensors and interlock devices within the harness enables real-time monitoring and control of the high-voltage system.

What Happens During a Fault in the HVIL System?

In the event of a fault detected in the HVIL system, the interlock loop is opened automatically. This swift response isolates the high-voltage components, preventing potential hazards. Understanding the fault detection mechanism is essential for maintaining the overall reliability and safety of electric vehicles.

How Does the HVIL Harness Contribute to Technicians' Safety?

The HVIL harness significantly contributes to technicians' safety by ensuring that high-voltage systems are in a de-energized state before they commence maintenance or service work. This proactive approach minimizes the risk of electric shock and related injuries, fostering a secure working environment.

HVIL in Electric Vehicle Standards: What are the Regulations?

Electric vehicle standards often mandate the inclusion of safety features like the HVIL harness. Understanding the specific regulations and standards ensures compliance and reinforces the commitment to high safety standards in the electric vehicle industry.

Future Developments in HVIL Technology for Electric Vehicles?

As electric vehicle technology advances, ongoing research and development focus on enhancing HVIL technology. Exploring innovations such as smarter interlock systems and improved fault detection mechanisms will further elevate the safety standards of high-voltage systems in electric vehicles.

This comprehensive exploration of HVIL harnesses in electric vehicles provides insights into their significance, functionality, and ongoing advancements in ensuring the safety of high-voltage systems.