HIGH COST AND COMPLEXITY OF ULTRA-FAST CHARGING HARDWARE
The cost and technical complexity of implementing ultra-fast charging hardware are one of the most important limitations in the Automotive CCS EV charging system market. Chargers based on CCS with the power range of 150 kW 350 kW demand an engineering advanced solution, such as liquid cooling systems, high-power electronics, and powerful thermal management components. Such systems are much more costly than smaller capacity AC or even simple DC chargers, and can cost tens of thousands of dollars per unit prior to installation.
In addition to the hardware, ultra-fast CCS stations imply considerable investment in infrastructure. These are high-voltage transformers, grid interconnections, energy storage integration, and protective switchgear which further increases capital expenditure. The overall expense of installing one ultra-fast CCS charging station, in particular, in remote or undeveloped areas, can go into the tens of thousands of dollars, which is also a problem to independent operators, small towns, and developing nations.
Moreover, ultra-fast chargers impose large grid loads, which require grid reinforcement or upgrades in most locations. Not only are these upgrades costly, but they also necessitate liaison with utility companies and long permitting procedures that slow down the project schedule and limit scalability. Additionally, the long-term costs of operation are increased by the fact that high-power CCS chargers require specialized skillsets and components to maintain and service.
Some investors are reluctant to invest in EVs, particularly, in areas where the EV penetration rates remain low due to the high cost-to-benefit ratio at the initial phases of the EV market development. Consequently, the complexity and cost of ultra-fast CCS hardware remains a major barrier to wide-spread use.
LIMITED GRID CAPACITY AND ENERGY SUPPLY CONSTRAINTS
Demand in CCS ultra-fast charging is growing explosively which presents an unprecedented challenge to the current electrical grids, as grid capacity is a severe limiting factor in market growth. Over three-quarters of the charging infrastructure developers say that they are experiencing difficulties in getting sufficient grid capacity to install new EV charging stations. Also, it has been estimated that 80 percent of prospective fast-charging locations in the world have limited or no grid connections, and their upgrade can be costly (between 150,000 and 3 million per site) and slow (1 to 3 years).
The power grids in areas with obsolete power systems, mainly the residential sectors, are usually not in a position to accommodate surges of power caused by several CCS chargers at the same time. Localized transformer overloads, voltage instability and peak demand during the evening hours when EV charging peaks are reported in studies carried out in the state of Arizona and India.
In addition, the problem does not concern only hardware. Current grids often do not have the smart infrastructure that is required to manage loads, offer dynamic prices and integrate renewable sources. Unless high-tech systems, such as V2G, or some form of coordinated charging is in place, the fast rate of EV adoption can increase peak load pressures and transmission congestion.
That is because the scale of EV growth is enormous, and grid reinforcement can cost trillions to implement, with some estimates indicating that more than $1 trillion worldwide by 2035 will be necessary to facilitate the wide adoption of electrified transportation. To most operators of charging networks, constrained energy capacity and lack of grid preparedness translate to slower rollouts, increased front-end investment, and reliance on expensive workaround solutions such as onsite energy storage or fossil-fuel generators.
BATTERY TECHNOLOGY LIMITATIONS AFFECTING CHARGING SPEED EFFICIENCY
Although the EV charging infrastructure has been developing at a very fast pace, the battery technology is the bottleneck in utilizing all the potential of CCS ultra-fast charging systems. CCS chargers are capable of providing up to 350 kW power but most electric vehicle batteries of the current generation are not configured to accept this level of power consistently without degrading performance or life expectancy.
The most common battery chemistry in the current EVs, lithium-ion batteries, are thermally and chemically stressed by rapid charging. Fast charging causes a higher rate of lithium plating, degradation, and can shorten battery life with time. Consequently, most automakers purposefully limit the highest charging rate that their vehicles can support (and sometimes far below the technically possible CCS systems). As an example, certain mainstream EVs continue to charge at peak rates of 100 150 kW, even on 350 kW CCS chargers.
Furthermore, fast charging operation is very sensitive to battery state-of-charge (SoC), ambient temperature, and battery management system (BMS) calibration. Charging speed is slower at low temperatures or when the battery is nearly full, so charging in practice is usually slower than in theory. This lack of synergy between the infrastructure capacity and the battery availability may result in customer dissatisfaction and the failure to use costly CCS equipment.
Although new-generation technologies such as solid-state batteries and enhanced thermal management systems will help address these problems, their commercial implementation is not expected to be achieved in the nearest years. To this end, the charging infrastructure potential and the battery constraints will remain a barrier to the performance and economic feasibility of CCS ultra-fast charging implementations until that point.
The Automotive CCS EV charging system market has a big opportunity of developing Vehicle-to-Grid (V2G) technology. V2G will not only allow the charging of electric vehicles, but will also allow the electric vehicles to supply the grid with stored energy, turning EVs into distributed energy resources. This two-way energy movement will promote grid stability, enable renewable energy access, and enable new monetization opportunities to EV users and fleet operators.
With the growth of V2G, CCS systems will be well placed to succeed because of their ability to maintain high-power, two-way charging. A number of nations are already investing and researching on V2G infrastructure. In the Netherlands, MyWheels, a car-sharing company is launching 500 Renault EVs with bidirectional charging to supply local energy needs - one of the largest V2G projects in Europe. In the UK, another instance of V2G being utilised to balance grid during intermittent renewable supply is the Oxford Energy Superhub.
China is also facilitating the integration of V2G by piloting the technology in some of its major cities such as Beijing and Shanghai. These projects are aimed at stabilizing the grid through EVs during peak demand hours and identifying commercial opportunities of grid interactive mobility.
Carmakers such as Nissan, Ford and BMW are working with utilities to install V2G in cars with CCS, such as ChargeScape. With the technology rapidly maturing, V2G will provide a potentially lucrative route by which CCS systems can transition beyond being a static charging platform into an active part of the smart energy future.
PARTNERSHIP WITH FLEET OPERATORS
The partnership between CCS charging systems providers and fleet operators is an opportunity with high impact to speed up the market. With commercial fleets such as delivery vans, taxis, buses and corporate vehicles starting to switch to electric power, they need a reliable, scalable and fast-charging infrastructure to ensure operational up-time.
