A growing safety concern in India • EVreporter

In the rapidly evolving landscape of electric vehicle infrastructure, the role of DC fast chargers is pivotal. However, a pressing issue is emerging within the Indian market: the widespread neglect of Electromagnetic Interference (EMI) and Electromagnetic Compatibility (EMC) filters in these DC Fast EV chargers.

As more Indian manufacturers bypass the installation of these crucial components, the potential for significant damage to EVs and the broader electrical ecosystem grows alarmingly, writes Mohit Singhal, Managing Director & CEO at BLA ETECH, in this opinion piece for EVreporter.

Understanding EMI/EMC filters

EMI/EMC filters are designed to suppress electromagnetic noise and ensure compatibility between electronic devices. In the context of DC fast chargers, these filters play a vital role in mitigating interference that can disrupt the proper functioning of both the charger and the EV. They help maintain the integrity of the electrical signals, ensuring that the charging process is efficient and safe.

The concerning trend in India

Despite their importance, a troubling trend has emerged among Indian manufacturers who produce DC fast chargers for electric vehicles. Once installed at charging stations, many of these chargers lack the necessary EMI/EMC filters. While this cost-cutting measure reduces initial expenses, it poses significant long-term risks.

Potential damage and safety hazards from EMI/EMC deficiencies

The absence of EMI/EMC filters can lead to various types of damage and operational issues for EVs, posing severe safety hazards:

• Electronic Component Damage: Without proper filtering, the electrical noise can cause malfunctions in the sensitive electronic components of EVs. This can lead to the premature failure of critical systems such as the Battery Management System (BMS), inverter, and onboard charger.

• Malfunctioning of BMS: The interference can cause the BMS to malfunction, leading to incorrect monitoring and management of the battery pack. This can result in overcharging, overheating, or deep discharging, significantly increasing the risk of thermal runaway and fires.

• Increased Fire Risk: The most alarming consequence is the potential for EVs to catch fire. Unfiltered electrical noise can lead to overheating and short circuits, creating a significant fire hazard that puts both the vehicle and its occupants at risk.

• Voided Warranties: Recognizing these risks, EV manufacturers stipulate that warranties are voided if the vehicle is charged with non-compatible DC fast chargers lacking EMI/EMC filters. This leaves EV owners unprotected against costly repairs or replacements if damage occurs due to using such chargers.

• Operational Disruptions: Continuous exposure to electromagnetic interference can lead to repeated disruptions in the charging process, causing inconvenience to EV owners and reducing the reliability of the charging network.

The need for regulatory intervention

To address this growing concern, it is imperative that regulatory bodies in India enforce stringent standards for DC fast charger manufacturing. Mandating the inclusion of EMI/EMC filters in all chargers can help mitigate the risks associated with electromagnetic interference. Such regulations would not only protect consumers but also enhance the overall reliability and safety of the EV infrastructure.

Conclusion

As India accelerates towards an electric future, the integrity of its charging infrastructure cannot be compromised. The neglect of EMI/EMC filters in DC fast chargers poses a significant threat to both the vehicles and their users, including the risk of fires and voided warranties. Manufacturers must prioritize the inclusion of these critical components to ensure a safe, reliable, and efficient charging experience. Regulatory authorities must also step in to enforce compliance, safeguarding the interests of EV owners and promoting sustainable growth in the EV sector.

Also read: Towards standardization of DC charging for light e-vehicle