What is the role of Combined Charging System in EV Charging?

What is the Combined Charging System (CCS) and Its Role in EV Charging?

Last Updated: 14/06/2024

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What is the Combined Charging System (CCS) and Its Role in EV Charging?

The Combined Charging System (CCS) has become a global standard in electric vehicle (EV) charging as the popularity of EVs soars. As more drivers switch to electric, the demand for more efficient and universally compatible charging solutions grows. CCS meets this need by offering a flexible, scalable, and future-proof charging infrastructure that supports everything from residential charging stations to high-speed public charging hubs. Now, let’s dive deep!

combined charging system for electric vehicles

The Evolution of EV Charging

Before delving into the specifics of CCS, it’s essential to understand the evolution of EV charging systems. Early EVs primarily used proprietary charging connectors and standards, which created a fragmented landscape. Different manufacturers had their own charging solutions, leading to compatibility issues and inconvenience for EV owners. This fragmentation also hindered the development of a robust charging infrastructure.

To overcome these challenges, several organizations and industry consortia began working on standardized charging solutions. One of the most significant outcomes of these efforts is the Combined Charging System.

What is the Combined Charging System (CCS)?

The Combined Charging System (CCS) is a charging standard for electric vehicles (EVs) that merges two distinct connector types into a unified system. Its main objective is to offer a universal charging interface that accommodates both AC (alternating current) and DC (direct current) charging. This versatility makes CCS suitable for a wide range of charging situations.

There are two principal versions of CCS connectors: Type 1 and Type 2. Type 1 is primarily used in North America, whereas Type 2 is more prevalent in Europe and other parts of the world. Despite these regional variations, both types adhere to the same essential design features and functionalities.

CCS connectors

Components of the Combined Charging System

The Combined Charging System integrates several essential components to ensure a smooth and efficient charging process:

  • AC Charging Connector: This connector is used for slower to moderate-speed charging, commonly found at home or workplace charging setups. It supports both single-phase and three-phase AC charging, accommodating a diverse range of power outputs.
  • DC Charging Connector: Designed for rapid and ultra-rapid charging, the DC charging connector is ideal for public stations and highway rest stops. It delivers high power directly to the vehicle’s battery, drastically cutting down on charging times.
  • Communication Protocol: CCS employs the ISO 15118 communication protocol, which enables seamless interaction between the EV and the charging station. This protocol facilitates advanced features like Plug & Charge, streamlining the billing and authentication process to enhance the user experience.
  • Vehicle Inlet: The inlet on the vehicle is crafted to accept both AC and DC connectors, making it versatile across various charging infrastructures. This dual-functionality inlet is a distinctive attribute that distinguishes CCS from other charging standards.

How Does CCS Work?

When an electric vehicle is connected to a charging station, CCS determines the appropriate charging mode — AC or DC — based on the type of connector used and the capabilities of the charging station.

In AC charging, the process involves the EV’s onboard charger, which converts the AC power from the station into DC power that charges the vehicle’s battery. The speed of charging in this case depends on the onboard charger’s capacity and the power output of the AC charging station.

Conversely, DC charging circumvents the onboard charger, supplying DC power directly to the vehicle’s battery. This approach supports much higher power levels, facilitating quicker charging times. The conversion from AC to DC is managed by the charging station’s power electronics, which allows for this swift charge delivery.

Advantages of the Combined Charging System

The Combined Charging System offers several advantages that contribute to its growing popularity:

  • Versatility: CCS supports both AC and DC charging, making it suitable for various use cases. Whether you need a slow overnight charge at home or a quick top-up at a highway rest stop, CCS has you covered.
  • Scalability: The system is designed to accommodate different power levels, from low-power AC charging to high-power DC fast charging. This scalability ensures that CCS can meet the needs of current and future EVs with larger batteries and higher power demands.
  • Standardization: By providing a universal charging standard, CCS reduces fragmentation in the EV charging market. This standardization simplifies infrastructure development and ensures compatibility between different EV models and charging stations.
  • User Convenience: Features like Plug & Charge streamline the charging process, allowing for automatic authentication and billing. This convenience enhances the overall user experience and encourages EV adoption.
  • Future-Proof: CCS is designed with future advancements in mind. As battery technology and charging infrastructure evolve, CCS can adapt to support higher power levels and new features, ensuring long-term viability.

EN Plus solutions of combined charging system

Challenges and Considerations

While the Combined Charging System offers numerous benefits, it also faces some challenges and considerations:

  • Infrastructure Development: Expanding the CCS charging infrastructure requires significant investment and coordination between various stakeholders, including governments, automakers, and charging network operators.
  • Interoperability: Ensuring seamless interoperability between different EV models and charging stations can be complex. Ongoing efforts to improve compatibility and address technical issues are crucial for the system’s success.
  • Cost: High-power DC fast charging stations can be expensive to install and maintain. Balancing the cost of infrastructure development with the benefits of rapid charging is a key consideration for stakeholders.
  • Global Adoption: While CCS is gaining traction globally, there are regional differences in charging standards and preferences. Harmonizing these standards and promoting CCS adoption worldwide is an ongoing effort.

CHAdeMO vs CCS: Exploring the Main Differences

In addition to the Combined Charging System, CHAdeMO stands as another prominent EV charging standard. In this section, we’ll delve into a comparison between CCS and CHAdeMO, examining several crucial aspects of each system.

CHAdeMO EV charging standard

What is CHAdeMO?

CHAdeMO is a fast-charging standard for electric vehicles (EVs), developed by a consortium including Nissan, Mitsubishi, and Tokyo Electric Power Company. Launched in 2010, it uses a dedicated DC connector separate from the AC charging port, enabling high-speed charging directly to the vehicle’s battery. Originally supporting up to 62.5 kW, the latest CHAdeMO version 2.0 can handle up to 400 kW.

CHAdeMO is known for its bi-directional charging capability, allowing for Vehicle-to-Grid (V2G) applications where EVs can both draw power from and supply power back to the grid. This feature supports grid stability and efficient energy management.

While CHAdeMO is widely used in Japan and Asia, its adoption in Europe and North America is more limited due to competition from the Combined Charging System, which offers a unified AC/DC charging solution in a single connector.

Comparing CHAdeMO and CCS

Aspect CCS CHAdeMO
Connector Design Combines AC and DC in one connector Separate DC connector, requires AC inlet
Power Levels AC: 3.7-22 kW<br>DC: up to 350 kW+ Initially 62.5 kW<br>CHAdeMO 2.0: up to 400 kW
Protocol ISO 15118, Plug & Charge Proprietary, supports V2G
Adoption Europe, North America; regulatory support Japan, Asia; limited elsewhere
Charging Stations Rapid growth, significant investments Extensive in Japan and Asia
Accessibility Single connector for AC/DC, user-friendly Separate connectors, less convenient

The Future of CCS and EV Charging

As the EV market continues to grow, the Combined Charging System is poised to play a central role in the development of a robust and reliable charging infrastructure. Several trends and advancements are expected to shape the future of CCS and EV charging:

  • Higher Power Levels: Ongoing research and development are focused on increasing the power levels supported by CCS. Future iterations of the system may enable ultra-fast charging with power levels exceeding 350 kW, further reducing charging times.
  • Wireless Charging: Inductive charging, which allows for wireless power transfer between the charging station and the vehicle, is an emerging technology that could complement CCS. Combining wired and wireless charging solutions could offer even greater convenience and flexibility for EV owners.
  • Expansion of Charging Networks: Efforts to expand and enhance charging networks are underway worldwide. Increased investment in charging infrastructure, combined with supportive policies and incentives, will drive the growth of CCS-compatible charging stations.
  • Integration with Smart Grid: The integration of CCS with smart grid technologies can optimize charging patterns, reduce peak demand, and enhance grid efficiency. Smart charging solutions can leverage real-time data and predictive analytics to manage energy resources effectively.


The Combined Charging System marks a significant leap forward in EV charging technology. Offering a versatile, scalable, and standardized approach, CCS tackles many of the hurdles currently facing EV charging infrastructure. As technologies advance, CCS is poised to support the increasing adoption of electric vehicles, playing a critical role in fostering a sustainable and fully electrified future.

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