How Tapes Enable Bi-directional Charging
Electric mobility has seen a big push recently, especially since many limiting factors can be remedied. However, one limiting factor is still unresolved: the widespread implementation of bi-directional charging. Although it offers various advantages in many ways, there are still challenges that need to be addressed before electric mobility can unveil its full potential.
Follow me through the power lines of electric vehicle charging to see where the current challenges and potentials of bi-directional charging are, and the role innovative foam and tape materials can play in the mobility of the future.
Today, EV (Electric Vehicle) charging is mostly a one-way process where the battery of a vehicle is electrically charged when connected to the grid through plugs, wall boxes or at special charging stations. Bi-directional charging, however, is a more advanced two-way process that allows to convert stored energy from the EV battery back into the grid for a variety of uses.
This vehicle-to-grid (V2G) technology enables electric vehicles to act as mobile energy storage, their batteries can be discharged to provide power to the grid during peak demand periods and helping to balance the electrical grid.
What seems logical and simple at first, however, presents engineers with many challenges, which is also reflected in the fact that only a small proportion of the electric vehicles available today support bidirectional charging.
Let us explore why every EV on the market today is not a rolling bi-directional power bank.
In theory, bi-directional charging of electric vehicles offers many advantages. The most obvious is of course its nature of storing energy from the grid during high-power periods — like when there is plenty of wind and sun for renewable energy production — and discharge it back to the grid during peak demand periods or when there is no sun or wind. This helps to avoid peaks, balance the electric grid and eases planning power supply in the entire grid.
For grid operators, an advantage of bi-directional charging can be to have decentralized emergency backup power during power outages. Therefore, the biggest interest of bi-directional charging seems to be for “peak shaving.” This means that it can return power from the battery to the Grid (V2G) or Home (V2H) when demand and cost are high. The benefit: it can help to “localize” power availability, so the electricity doesn’t need to be transmitted over long distances. EVs could help provide critical power to homes and businesses in critical times.
For EV owners, bi-directional charging could result in cost savings as it allows them to sell excess energy back to the grid, reducing their electricity bills and potentially generating income. As with smart charging, vehicles will charge overnight when demand and cost are lower.
If there are win-win situations, there must be challenges that cause avoidance of wide implementation of bi-directional charging. One challenge has to do with the battery technology of EVs as many of the currently used batteries are not optimized for efficient and durable bi-directional charging.
On the grid side, bi-directional charging infrastructure is not yet widely available, and it would require significant investments in infrastructure, capabilities and resources.
Like with all the different types of connectors these days, there is no current regulation as a foundation of widespread bi-directional charging.
Lastly, there are remaining safety concerns of overcharging or undercharging of batteries in bi-directional charging, which must be addressed to ensure safe implementation. While tape solutions have few influences on solving the above challenges, innovative foams and tape can help mitigate risks in fast and bi-directional charging. Let us take a deeper look at how.
Innovative foam and tape solutions like compression pads, thermal runaway protection materials or Thermal Interface Materials provide insulation and other unique properties that can make battery packs and EV charging stations safer, higher performing and last longer. These material properties can also help to solve current challenges in bi-directional EV charging.
Like in batteries and charging stations, foam and tape materials can be used to insulate and dissipate heat occurring during charging and discharging with high voltage and current. They help reduce thermal management issues and protect sensitive components and the entire system.
The electrical insulation properties of high-end materials combined with strong backings made of Kapton®, Nomex®, PTFE or Mica, make foams and tapes ideal insulation material to help regulate voltage and prevent overcharging or undercharging of the battery. In addition, their proven electrical insulation performance helps prevent electrical shock or fire.
But these applications only consider the actual charging or discharging process. The challenge will be to ensure that all components of the grid, from power generation and -transformation, transportation and storage to the vehicles and back to grid and battery energy storage systems seamlessly work together. In all these applications, special tapes are often unseen heroes that solve the bonding, gasketing and isolation challenges to allow the efficiency and performance needed for the entire energy supply system of the future and making it strong enough to handle bi-directional charging.
Even though only a few EVs support bi-directional charging and there are many open questions, the trend towards V2G technology is clear. The proportion of bidirectional vehicles will increase significantly in the coming years, bringing with it significant improvements and further developments in bidirectional charging.
Overall, innovative foam and tape solutions can play a critical role in ensuring the safety and efficiency of bi-directional charging of EV vehicles. Start talking to your tape expert today to be ready with effective insulation and thermal management solutions that can help you create pioneering bi-directional charging technologies.