Accelerating E-Mobility with Advanced Technologies

Charging an electric car
Despite the attractive incentives offered by governments around the world and the advantages of driving electric vehicles (EVs), adoption has been rather sluggish in recent years. Plus, the COVID-19 pandemic further aggravated the situation, leading to a higher-than-ever consumer demand for EVs without the stock to support it. While there are several causes contributing to this slump in supply, four major factors affecting the sale of EVs are high cost, range limitations, infrastructure unavailability, and high battery-charging time.

EV Barriers and Solutions

Traditionally, EVs have been 2 to 2.5 times more expensive than conventional internal combustion engine (ICE) vehicles, and this cost has recently further risen with base metal and rare earth prices going higher due to the crisis in Ukraine. However, this can be offset by increasing production, providing government incentives and tax credits to EV buyers, and improving battery technology.

Speaking of production, early in 2022, both General Motors Company (GM) and Ford Motor Company unveiled plans to boost EV production in the United States. To significantly expand battery cell manufacturing and electric truck production capacity, GM announced an investment of more than US $7 billion in four Michigan manufacturing sites. Meanwhile, Ford revealed plans to spend US $50 billion and build more than 2 million EVs in 2026, accounting for about one-third of its annual expected global production. Additionally, Tesla’s Gigactories in Texas and Berlin were readied for ramping up production in 2022.

Like the key auto manufacturers in the U.S., major auto players in Europe are also planning to boost EV production and transition to all-electric cars by 2030. As EV sales grow, electric cars are coming closer to achieving price parity with traditional ICE vehicles in Europe.

EV range is another deterrent. While a few years ago the driving range was limited, today’s models are flaunting 300+ miles per charge. A recent report from Edmunds shows that the 2022 model Mercedes-Benz EQS demonstrated a range of 450 miles, while the EPA estimate was rated at 350 miles. Similarly, the 2021 Tesla Model 3 placed second with a range of 345 miles and an EPA estimate at 353 miles.

In all, there are 32 EV models listed on Edmunds’ EV Range Leaderboard. The #32 model on this board is the 2022 Mazda MX-30, offering a range of 114 miles with an EPA rating of 100 miles. Efforts continue to improve the range per charge. Recently, Lucid Motors’ first EV, the Lucid Air, designed in Silicon Valley and produced in Arizona, delivered an industry-leading 500+ miles of range using a proprietary powertrain technology. For performance and range, the Lucid Air won the MotorTrend’s “2022 Car of the Year” award. Its built-in Wunderbox is an ultrafast battery charger that implements a 900V+ architecture to deliver up to 300 miles of charge in just 20 minutes. In addition to fast charging, it is compatible with nearly every public charging station in the country and is expected to offer bidirectional charging capabilities soon.

Ford has also taken the next step in bidirectional (two-way) charging with its new F-150 Lightning EV. At the 2022 CERAweek conference in Houston, TX, Ford and PG&E announced a collaboration to explore how Ford’s F-150 Lightning EV with bidirectional charging capability can interact with the electric grid and provide electric reliability benefits to PG&E customers. “Through collaborations with automakers like Ford, we are innovating together for a cleaner, safer, and brighter future for all,” said PG&E’s CEO Patti Poppe. Through such EV charging infrastructure programs, PG&E is helping reduce one of the biggest barriers to EV adoption: the limited availability of charging outlets.

For e-mobility to be practical and appealing to the majority of car users, a larger network of charging stations and outlets is essential. As of January 2022, according to research firm Statista, there were nearly 113,600 charging outlets in the U.S. for plug-in EVs, with 36% located in California. Additionally, President Biden announced a US $7.5 billion investment to expand the EV charging infrastructure nationwide. It’s no surprise that China remains a leading market for EV adoption, supported by a robust infrastructure with approximately 800,000 charging stations across the country.

Simultaneously, manufacturers are developing ultrafast chargers to reduce charging time to under 20 minutes. At the Future Propulsion Conference 2022 (FPC2022) in the U.K., McLaren Applied announced progress toward full production of its Inverter Platform Generation 5 (IPG5), an 800V silicon carbide (SiC) inverter designed for ultrafast charging, improved efficiency, and extended range. IPG5 is a next-generation architecture that supports modern EV platforms, enabling lighter electric cabling and faster charging while lowering drivetrain weight and cost.

In short, charging architecture is moving from a 400V to an 800V architecture in the near future. At this high voltage, battery management systems (BMS) need mechanically robust plug connections and must provide high levels of safety and reliability with constant communication with the charging station. All this translates into a need for very high-performance, high-voltage AC/DC converters and high-isolation DC/DC converters. For this monitoring task, RECOM has developed the RAC05-xxSK/480 family of AC/DC converters that can handle input voltages up to 528VAC. Additionally, RECOM has readied a series of 1W isolated DC/DC converters used in BMS applications in electric cars. Here, each battery module requires a separate DC/DC converter to isolate monitoring electronics equipment operating at several floating voltages delivered from the controller area network bus.

Furthermore, charging stations are using highly isolated DC/DC converters to control power semiconductors such as IGBTs, SiC or Si-MOSFETs, and GaN-FETs. This requires optimal gate drivers that can precisely provide positive and negative voltages to control the switching process and avcapable of precisely delivering positive and negative voltages to manage the switching process and prevent misfires. Since these power switches operate at high floating voltages, the gate driver’s voltage supply must provide robust electrical isolation. To address this, RECOM has developed asymmetric output reinforced isolation DC/DC converters with output voltages of +15V/-9V (IGBT), +15V/-3V and +20V/5V (SiC), and +6V (GaN). To ensure long system service life, these converters offer wide operating temperature ranges and low isolation capacitance.

Adopting Solid-State Batteries

As the race to improve e-mobility technologies across the world continues, many automobile original equipment manufacturers (OEMs) are now preparing to incorporate solid-state batteries (SSBs), an alternative to conventional lithium-ion (Li-ion) batteries. SSBs replace the liquid- or gel-form electrolyte found in popular Li-ion batteries with solid, conductive electrodes and electrolytes that offer lighter weight, greater energy density, and more range at a lower cost. Additionally, emerging SSBs offer improved safety, as they contain no flammable materials.

To accelerate the development of SSBs, automotive OEMs are investing significant resources in battery manufacturing technologies. The German automaker Volkswagen, for example, announced a USD $100 million investment in QuantumScape Corp., an SSB startup that spun out of Stanford University, California. In a recent press release, QuantumScape reported that its solid-state lithium-metal battery cells completed 400 consecutive 15-minute fast-charging (4C) cycles from 10% to 80% capacity, while retaining well above 80% of their initial energy. The company claims this is a first for this type of battery technology. QuantumScape conducted the tests on commercially relevant, single-layer prototype cells at multiple temperatures (25°C and 45°C), 3.4 atmospheres of pressure, and 100% depth of discharge. Last year, the company also demonstrated a 10-layer cell capable of at least 800 cycles with over 80% energy retention at a 1C–1C charge/discharge rate under the same test conditions.

Jagdeep Singh, co-founder and CEO of QuantumScape, said in a statement, "We are delighted to have met this technical milestone with Volkswagen, and we look forward to working jointly to bring solid-state lithium-metal battery technology into industrialized mass-production." Last December, in an interview with The Verge, the CEO said that QuantumScape will be ready to go into production in 2024.

Likewise, Mercedes-Benz has inked a cooperation deal with the Taiwanese SSB battery maker ProLogium Technology Co. to build test vehicles equipped with co-developed SSBs in the coming years. And the automaker Ford has invested US $20 million in the SSB developer Solid Power. The partnership is expected to capitalize on Solid Power’s fully automated, roll-to-roll production facility, which became operational only last year.

New technologies such as SSBs require high-performance, innovative voltage converters in both production and implementation, and RECOM is ready to deliver custom and semicustom AC/DC and DC/DC solutions for this constantly evolving e-mobility market.
Applications
  Series
1 AC/DC, 5 W, Single Output, THT RAC05-K/480 Series
Focus
  • Ultra-wide input range 85-528VAC
  • OVC III input rating without additional fuses
  • Operating temperature range: -40°C to +80°C
  • Overvoltage and overcurrent protected