Under-Skin Tech: Making EV Batteries Smaller and Cheaper
The world of electric vehicles (EVs) is constantly evolving, with new technologies and innovations being introduced to improve their efficiency and performance. One such innovation is the Intelligent Battery Integrated System (Ibis), a project developed by Stellantis in collaboration with battery manufacturer Saft. The Ibis project aims to reduce the number of components in an EV by approaching battery technology in a different way.
EV powertrains consist of several key components, including the battery, electric motors, and an on-board charger. The battery stores and must be charged by direct current (DC) electricity, while the electric motors are powered by alternating current (AC). To convert AC to DC and vice versa, an inverter is required for each motor. Additionally, an on-board charger is needed to convert AC current from the grid into DC to charge the battery.
Traditionally, EV batteries are made up of multiple small lithium-ion cells arranged into modules. These modules are then connected together to form a battery pack. Each module may have a low voltage, depending on the pack’s size and design. However, the Ibis project takes inspiration from photovoltaic systems to simplify the hardware in an EV.
Solar power generation systems use multiple microinverters to convert DC electricity to AC as it leaves each individual solar panel. Similarly, the Ibis project incorporates microinverters into each battery module, eliminating the need for an on-board charger and a high-voltage inverter. This means that each module can produce AC current, ready for the motor.
The integration of microinverters and chargers into each battery module offers several advantages. Firstly, it reduces the overall number of components in an EV, making it simpler and potentially more reliable. Secondly, it saves space, making it particularly beneficial for small EVs where space is at a premium. Lastly, it is expected to be more cost-effective, as multiple smaller charger and inverter electronics are likely to be cheaper than their high-voltage equivalents.
The Ibis project represents a significant step forward in EV technology. By reimagining the way batteries are designed and integrated, Stellantis aims to make EVs even more efficient and affordable. However, it is worth noting that the Ibis approach may not be compatible with other concepts, such as Volkswagen’s “Cell2Car” initiative, which aims to fit individual cells directly into the chassis of the car.
The development of the Ibis project highlights the continuous innovation happening in the EV industry. As the demand for electric vehicles grows, manufacturers are constantly striving to improve their performance, range, and affordability. By exploring new ideas and technologies, such as integrating microinverters into battery modules, the industry can overcome existing challenges and pave the way for a cleaner and more sustainable future.
In conclusion, the Ibis project is an exciting development in the world of EVs. By using package-friendly microinverters and chargers, Stellantis aims to simplify EV powertrains and reduce costs. This innovative approach has the potential to benefit small EVs where space is limited and make EVs more accessible to a wider range of consumers. As the EV industry continues to evolve, it is innovations like the Ibis project that will drive its growth and success.