Bigger Batteries Will Not Solve the Urban Electric Vehicle Challenge

By Adam Chase

Adam Chase is a Director of E4tech, a UK and Swiss-based strategic consultancy firm with a 20 year track record of advice to companies and governments on energy and vehicle futures.

Jan 22, 2018 | Mobility, Technology | 2 comments


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For those of us working on the future of vehicles and energy, this is a fascinating time. Cities are at the root of clean vehicle adoption, and city mayors can have more near term influence over automotive product offerings than national and international regulators. Original plans to ban diesel engine vehicles in Paris by 2030 have already given way to more stringent proposals. Rome, Madrid, Athens and Mexico City are also lining up to push out diesel vehicles by 2025. These cities do not constitute a dominant share of the global, European, or even national car markets; but they and cities following this trend are big enough to matter. Consumer uncertainty has set in and diesel car sales are in decline across all main markets; 17 percent down in the UK during 2017, for example. But clean air and greenhouse gas challenges mean that it is not just diesel that is under pressure, and the future of all fossil fuelled internal combustion engines is now blurry. Governments and vehicle manufacturers are signalling that new cars built from 2020 onwards into the future will be electric.

Current wisdom holds that the engine’s loss will be the battery’s gain. Manufacturers are knocking over barriers previously thought insurmountable, and consumers and operators are embracing plug-in vehicles in major cities worldwide. Job done? We think not yet. It is worth examining the overall picture, and cars separately from other vehicles to understand why.

 

For Cars, Battery Size Matters

For cars in major cities a battery electric vehicle with a modest range could meet the needs for most journeys, and so would be the logical choice for trips around town. However, we see potential drawbacks. First, private cars are not bought for average or even 90% of journeys; consumers desire a car to meet the extremes and for single car households that may include weekends out of town and holidays. Secondly, BEVs are most relevant in dense urban areas, yet this is also where recharging at home is most challenging. For example, 43% of UK households have no off street parking – a higher proportion inevitably applies in cities. Building genuinely cost-effective charging networks is proving tough, and the payment and maintenance business models have not yet matured.

Range and recharging drawbacks can be mitigated to some extent by larger capacity batteries, but this creates its own expensive knock-on. Even as battery costs tumble, a compact BEV with, say, a 100 mile range is still more expensive than its petrol engine equivalent. Subsidies mask this, for as long as governments can bear them. Total cost of ownership also tips the field back in the BEV’s favour somewhat, but for vehicles that do low mileages the case is weaker and depreciation is proving an Achilles heel for many BEVs.

Plug-in vehicles will have their day, but their success depends on something other than bigger batteries to deal with range and recharging challenges. A widespread functioning recharging infrastructure is important, particularly ‘fast’ (7-22kW) and ‘rapid’ (above 22kW) chargers which can provide useful range in minutes rather than hours. An alternative is some form of on-board range-extension device, whether an engine (optional in the BMW i3 for example) or potentially a fuel cell (a Mercedes GLC version will be launched this year). The latter’s obvious advantage is zero emissions in all modes, combined with an inbuilt insurance option against sparse hydrogen refuelling and electric recharging points.

 

Commercial Vehicles and Buses Are Challenged by High Utilisation

Rationally-minded fleet operators look for the lowest total cost to deliver an outcome. Battery EVs are part of the solution set for vans and buses that need guaranteed urban access in zero emission zones, high reliability and consumer acceptance. However, there are drawbacks here too. More range implies heavier and bulkier batteries which reduce vehicle carrying capacity, exceed weight limits for bridges, and even damage road surfaces. Also, most fleet vehicles are heavily utilised, meaning that the window for recharging (usually at night) is narrow. While this can be planned for, the combined load on the power network is huge. Uncontrolled charging of a 40 battery bus fleet amounts to over 2MW and even with smart charging a new connection of around 1MW is required. Such connections are often very hard to secure near congested depots, and larger fleets may require their own substation.

These problems can be alleviated by frequent top-ups (‘opportunity charging’) at bus stops and fast-charging points for commercial vehicles. Inductive charging pads in the road would make this even more convenient, but the upheaval and cost is not trivial. Another way to mitigate the charging challenge is on-board range extension, bringing engines and fuel cells into the picture, as for cars.

 

If Only There Was a Zero Emission Fuel

Battery vehicles will undoubtedly take a greater share of private car and commercial vehicle markets, but their rise will depend upon fast charging, opportunity charging, smart charging and ever-lower battery costs. Cities will help, with their push to eliminate fossil fuelled vehicles from their centres. In the meantime other options will continue to be developed, notably plug-in hybrids in the near term, and hydrogen.

Although plug-in vehicles can readily be deployed today using familiar infrastructure, the challenges set in as uptake increases, as described above. The inverse applies to hydrogen vehicles, whose infrastructure is costly to establish but easier and cheaper to scale up incrementally. Combined with hydrogen’s ability to fully refuel in minutes, provide zero emissions, act as a store for renewable electricity and even substitute natural gas for heating, the case for this fuel is strengthening. New research by KPMG reveals that a majority of senior global automotive executives believe that BEVs will struggle due to recharging, and that fuel cell vehicles will provide the real breakthrough for electric mobility.

Importantly, however, we do not see an either-or choice, and find the strident assertions of some protagonists both unhelpful and misleading. Hydrogen fuel cell range-extended battery cars and vans combine the benefits of both energy types. Fuel cell buses and trucks fit well where utilisation and range are paramount, batteries where there is more leeway. Battery cars are already proving attractive for customers who can live with a short range vehicle or seek performance with less regard to cost.

Ultimately, city authorities need not and should not pick a technology winner, so it is worth making sure that the push for low emissions does not focus solely on one type of ‘electric’ vehicle.

Discussion

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2 Comments

  1. Future cars will use far less energy than today’s brick shape with a gash for the windshield. Rolling battery swap will constantly exchange the battery mule greatly shrinking the battery size per vehicle. Solar panels under an elevated guideway will provide all of the transportation network with the energy so no power grid impact that everyone keeps chirping about. Shallow discharge greatly increases the number of charge/discharge cycles in a very non-linear fashion ending the need to EVER replace a battery in a vehicle. Hydrogen is dangerous and low energy density so not a good choice and its widespread use will kill people. Hybrids are unnecessary.

    Reply
  2. The author makes some good points about charging availability in the city, particularly for charging at night. City leadership needs to also focus on making sure there is charging where their residents like to go when they leave the city, be it trailhead, ski resort, petting zoo, state/national park etc. A factor in all instances is ensuring that charging facilities can be shared effectively, even when someone leaves their vehicle for hours on end and can’t reasonably be expected to return to their vehicle when charging has finished (e.g. while asleep, on a hike or on the slopes). I forsee a rise in the number of valet parking attendants. :-)

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