Thus far, the global electrification of transportation has been conducted mainly by the use of battery-powered vehicles. Over the years, the number of electric vehicles (EV) has grown substantially in number, the batteries have become larger in size providing vehicles with longer ranges, the efficiency of batteries has improved, and the prices have decreased substantially, etc. However, all batteries need to be charged with electricity. Several solutions to battery charging have been introduced, static and dynamic conductive and inductive technologies as well as cable charging. The most common, almost the dominant global solution, is stationary charging using cables, whether normal or fast charging.
There is, however, another battery charging tech- nology, that of battery-swapping, i.e. replacement of the discharged battery in the vehicle with a charged battery from outside the vehicle. This modern battery-swapping technology was used by the German company Mercedes-Benz in the 1970s, the Israeli company Better Place in 2007 and also by US company Tesla in 2013. Tesla originally designed their car in a modular way that embraced battery- swapping but then opted for their own proprietary cable-based charging system and a business model that integrates cars and charging.
During the 2010s, when the country started the substantial development of new energy vehicles, Chinese grid operators and entrepreneurial OEMs tried to put the swapping technology into practice in collaboration with Better Place. However, the early exploitation of battery-swapping failed due to the high cost of battery-swapping systems and batteries, lack of standards, lack of openness and diver- gent technical and economic interests among key stakeholders and objections from car manufacturers to opening up their vehicle structure. Additionally, one fire accident on a pilot project car raised safety questions that needed to be solved. Lastly, political support was lacking because the Chinese government did not promote battery-swapping technology in the countries’ first strategic development plan for a new energy vehicle 2012 to 2020.From 2012 to 2016, battery-swapping charging stations underwent large-scale development as the major complementary energy solution in China. BAIC, Lifan, NIO and some other Chinese OEM brands together with third-party battery-swap station opera- tors, such as Aulton, insisted on exploring the battery-swapping option and made substantial progress. Market scale reached a certain volume and the technology became more mature. When cable-based charging solutions became insufficient, forming the bottleneck of the rapidly growing EV market, Lifan again proposed battery-swapping as a complementary solution to the national congress in 2016. This time, the attitude of the various players was more positive. In 2020, after a discussion meeting with delegations from major stakeholders related to EV development, Chinese central government included battery-swapping technology in the National New Energy Vehicle Development Strategy 2021 to 2035 and included battery-swapping in the list of the New Infrastructure Construction campaign.
Since 2020, there has been fast growth in battery- swapping infrastructure in Chinese cities and along the main highways. Modularly designed cars with fully integrated automated fast battery-swapping system solutions are available. There are also other emerging application areas for battery-swapping such as buses, trucks, heavy-duty vehicles etc.
The new emerging business model for commercialization of battery-swapping is based on the idea of separating the price of the electric car from its cost liest part, the battery. Batteries can be chosen flexibly based on their size and can either be purchased or rented on a monthly basis to reduce anxiety and uncertainty among customers. Also, the charging of batteries can be cable-based or based on a monthly subscription according to the required amount of energy, resulting in great flexibility for the customer.
Thus, the investment cost for customers is based on their purchasing power, risk taking attitude, level of uncertainty and driving habits. The swapping time is reduced down to 1 minute. This system enables great flexibility because the customer can choose and, if necessary, subsequently change the battery size depending on their needs as well as choosing the charging system and payment methods.
At the end of January 2021, there were 562 battery-swap stations operative in China, providinga service to taxis, online car-hailing vehicles, private passenger vehicles and business operation vehicles. More than 100,000 cars have been sold with battery-swapping systems. Battery-swapping’s status asan important complementary solution to EV energy supply has been recognized by various parties. The feasibility of developing battery-swapping for taxis, online car-hailing vehicles, logistic vehicles and other business operation vehicles has been preliminarily verified.
The major challenges faced by players include the large investment required for battery-swapping station construction, operation and maintenance requests, the high financial cost of batteries in the swapping stations, and battery depreciation, difficulty in achieving unified standards, overlap of the division of responsibilities, limited space for station construc- tion and safety issues. Accordingly, solutions are being intensely worked on by various players.
A multi-player, new ecosystem is investing jointly in battery-swap stations and battery asset companies are also starting up. Third-party operator Aulton is initiating the exploration of battery standardization by unifying the interfaces of the battery outer package and the vehicles, leaving the content of the battery to OEMs. Government agencies are also driving a discussion on the standardization issue. Innovative collaborations on space sharing is providing space for battery-swap stations. Active and passive safety technologies are being developed that address the safety issue.
A combination of local provincial governments, the automotive industry, IT-developers, entrepreneurs, state grid system operators, swapping system operators, electricity suppliers, institutes and univer- sities are developing a new ecosystem and placing large-scale systems in operation.We call this the Chinese approach, the Symbiotic Business Model, the collective exploration and experimenting of industrial, institutional and political players, leading all the way from technology devel- opment through to the establishment of local market solutions for the development and commercialization of battery-swapping systems, and the simultaneous construction and reshaping of a new ecosystem.
The placement of battery-swapping on the national strategic list demonstrates the systematic approach to the electrification of transportation that needs to be seen and understood starting from energy production, distribution, charging, and the creation of a balancing component in overall energy sourcing and energy storage. Thus, the new ecosystem comprises the major part of the main players in the energy and electrification system. Battery-swapping must not be seen as just one technology that is only a business target for some players, but rather as strategic solution to the entire energy system transformation and part of the ongoing energy and transportation transformation.
The battery-swapping system when operated ona large-scale has significant strategic importanceas decentralized, distributed and localized energy storage helping to balance energy production and distribution in the national grid system. Substantial rapid developmental growth in battery-swapping is expected in China from 2021. It is still not possible to predict the long-term development of this technology approach, but it is only in trying it, that it will be possible to discover the outcome.
Implementation of the battery-swapping system can only be successful when all the main players in the energy-transportation system and along the value chain collaborate in the development and commercialization, implementation and large-scale diffusion.