What Is Plug & Charge? How It Works, Compatible EVs, Benefits, and More
Scanning QR codes or swiping cards to charge an EV can be cumbersome. Plug & Charge automatically authenticates the vehicle, authorizes charging, and processes payment when the connector is plugged in. This article explains how it works, its benefits, limitations, and FAQs.
What Is Plug & Charge?
Plug & Charge is an electric vehicle charging feature that complies with the ISO 15118 standard. Electric vehicle owners simply need to connect the charging connector to the vehicle, and charging can start automatically after authentication—without the need to scan a QR code, swipe a card, or confirm via an app.
How Does Plug & Charge Work?
Here is a brief overview of how the plug-and-charge feature works:
- Digital Certificate: The vehicle uses a digital certificate to identify and authenticate itself with compatible charging stations and charging services.
- Establishing a Communication Connection: When the charging connector is inserted into the vehicle’s charging port, the vehicle and the charging station establish a communication link via power line communication.
- Two-Way Identity Authentication: The vehicle and charging station exchange digital certificates, verify each other’s credentials, and complete secure identity confirmation.
- Backend Authorization Verification: The charging station uploads the vehicle’s identity to the operational backend to verify account status, usage permissions, and billing information.
- Automatic Charging Start: Once all verifications are passed, the charging station supplies power and automatically initiates the charging process.
- Data Recording and Settlement: The backend collects charging data, processes billing, and deducts fees—all without the need to scan a QR code, swipe a card, or use an app.
What Are the Benefits of Plug & Charge?
Convenience
With traditional public charging, drivers must scan a QR code, swipe a card, or open an app to complete authorization after plugging in the charging connector. With plug-and-charge, simply plug in the charging connector, and the entire authentication process is completed automatically.
In rainy or snowy weather, or during cold winter months, you don’t have to take your phone outdoors to operate it, avoiding the hassles of unresponsive screens and poor network connections, removing extra manual steps for drivers.
High Level of Security
It relies on digital certificates under the ISO 15118 protocol for secure two-way authentication; power isn’t supplied simply by plugging in the charging connector. Only authorized vehicles linked to the corresponding account can initiate charging, effectively preventing unauthorized charging and power theft, and ensuring the security of the owner’s account and funds.
Reduced Pre‑Charging Wait Time
High-speed service areas and urban public charging stations experience heavy traffic, and manually scanning codes to log in often takes a significant amount of time. Plug-and-charge eliminates the need for manual confirmation, shortens the preparation time before each vehicle begins charging, and reduces queuing pressure at charging stations—making it particularly suitable for EV owners on long-distance trips.
Supports Cross-Operator Roaming Charging
Once a vehicle has completed the certificate-to-account binding process, it can be used at compliant plug-and-charge stations from different brands and operators. There is no need to install multiple charging apps or repeatedly register and switch accounts.
Enabling Future Bidirectional Energy Applications
ISO 15118 also provides communication capabilities used by bidirectional charging and V2G applications. However, Plug & Charge itself is primarily an authentication, authorization, and payment feature. As supporting infrastructure gradually improves, vehicles will eventually be able to charge and discharge bidirectionally, participate in grid peak shaving, and offer owners the potential to earn additional energy revenue.
Which EVs Support Plug & Charge?
| Brand | Model |
|---|---|
| Ford | Mustang Mach‑E, F‑150 Lightning |
| BMW | i4, i5, i7, iX, XM |
| Porsche | Taycan, Macan EV, Cayenne EV |
| Audi | Q8 e-tron, Q6 e-tron, e-tron GT, Q4 e-tron |
| Volkswagen | ID.4, ID.5, ID.7 |
| Lucid | Air, Gravity |
| Mercedes-Benz | EQE, EQS, EQE SUV, EQS SUV |
| Hyundai | Ioniq 5, Ioniq 6 |
| Kia | EV6, EV9, Niro EV |
Plug & Charge Limitations and Compatibility
- Limited technological maturity. Plug & Charge is still a relatively new technology. Automaker and charger‑manufacturer implementations remain incompletely standardized, creating cross‑brand compatibility risks. Thorough compatibility testing is required for deployment.
- Limitations of Older Vehicles. Many older electric vehicles lack the hardware required to support ISO 15118. Software updates alone cannot compensate for this deficiency, so these models cannot use standard Plug & Charge.
- Vehicle-Side Compatibility. Vehicle hardware must support the ISO 15118 protocol. Some models require over-the-air (OTA) firmware updates and the completion of digital certificate and account binding; even if the hardware meets the standards but the certificate has not been configured, the feature cannot be used.
- Legislation and Compliance Requirements. Different regions have varying regulations regarding data privacy and payments. The U.S. government does not mandate that automakers equip vehicles with plug-and-charge capabilities; the decision to include this feature on the vehicle side is left to the automakers’ discretion, and implementation must comply with local regulatory policies.
How to Set Up Plug & Charge
Confirm Hardware Compatibility
The vehicle natively supports ISO 15118; some models require a firmware update. Select a charging station compatible with this protocol. Older models do not support this protocol and cannot be retrofitted to enable this feature.
Register a Charging Account
Register an account on the service provider’s platform and set up automatic payments.
Activate the Charging Certificate
Follow the vehicle manufacturer’s instructions to activate Plug & Charge and link the vehicle’s digital certificate to a compatible charging account. Some vehicles or charging networks may require a PCID or similar identifier during setup.
Test Plug & Charge
Connect to an ISO 15118-compatible charging station; inserting the charging cable automatically authenticates and starts charging, and unplugging the cable triggers automatic billing. If authentication fails, check the PCID binding status, account balance, and network connection.
What Is the ISO 15118 Standard? How Is It Related to Plug & Charge?
ISO 15118 is an international communication standard that specifies the communication rules for data exchange, security authentication, authorization, and payment between electric vehicles and charging stations.
In summary:
ISO 15118: Underlying technical communication standard
Plug & Charge: An EV charging feature implemented based on this standard
Plug & Charge vs. Autocharge: What’s the Difference?
| Features | Plug & Charge | Autocharge |
|---|---|---|
| Primary Standard | ISO 15118 | Network-Specific |
| Authentication | Encrypted digital certificates | Typically vehicle/network identification |
| Automatic Activation | Yes | Yes |
| Payment | Automatic billing | Automatic billing |
| Cross-Network Potential | High | More network-specific |
| Level of Standardization | High | Implementation varies by specific circumstances |
| Security Level | High | Lower |
Plug & Charge vs. RFID and Mobile Apps
| Features | Plug & Charge | RFID | Mobile Apps |
|---|---|---|---|
| Starts upon insertion | Yes | No | No |
| Physical card | No | Yes | No |
| Requires a smartphone | Usually not required | Not required | Usually required |
| Automatic authentication | Yes | No | Partially supported |
| Automatic billing | Yes | Yes | Yes |
| Encrypted secure authentication | Yes | No | No |
Conclusion: Plug & Charge offers a convenient, seamless charging experience, but it is subject to compatibility limitations between devices and vehicle models; card swiping and QR code scanning can still be used as alternative authentication methods. When setting up residential or commercial EV charging infrastructure, ZENCAR charging stations support multiple authentication methods, balancing practicality and security.
FAQ
Are there any additional fees for using Plug & Charge?
Generally, there are no additional service fees for using Plug & Charge; only standard charging fees apply. Standard station fees, such as parking and overtime charges, still apply as usual.
Do I need a credit card to use Plug & Charge?
To use Plug & Charge, you generally need to have a credit card or automatic payment method linked to your account in advance; charges are automatically deducted once charging is complete.
Does Plug & Charge support public DC fast charging?
Yes. Plug & Charge is particularly well-suited for public charging, including compatible DC fast-charging networks, as it automatically handles vehicle identification and charging authorization.
Can Plug & Charge be used without a cell phone signal?
Plug & Charge can still start charging by plugging in the charging cable even without a cell phone signal, but the charging station requires an internet connection to complete background account verification and payment processing.
How does the charger know which electric vehicle is connected?
The charging system uses the vehicle’s ISO 15118 certificate and related identifiers to authenticate the vehicle and associate it with the appropriate charging account.
Can I disable the Plug & Charge feature?
Users can disable Plug & Charge in the vehicle’s infotainment system settings and switch back to the traditional charging mode—scanning a QR code or swiping a card—at any time.
Does Plug & Charge Affect the EV’s Charging Speed?
Plug & Charge is solely responsible for authorization and authentication; it does not affect the EV’s actual charging speed.
Is Plug & Charge safe?
Plug & Charge relies on ISO 15118 encrypted digital certificate authentication, offering a high level of overall security; however, it is still necessary to ensure timely firmware updates for both the vehicle and the backend system.
Is Plug & Charge suitable for electric vehicle fleets?
Plug & Charge can be used for electric vehicle fleets. It simplifies charging through automatic certificate authentication and matches vehicles with their corresponding charging contracts.
What Happens if Plug & Charge Fails During Charging?
If Plug & Charge fails during charging, it typically does not interrupt an ongoing charging session. However, if automatic authentication fails during the startup phase, the charging station will be unable to begin charging. In this case, you can use alternative authorization methods such as the app, an RFID card, a QR code, or contactless payment.
