Traction battery concept makes electronic intermediate converter redundant
In order to improve the aforementioned factors, the development partners want to design and build a modularized hybrid energy storage system. Various high-energy and high-performance cells are combined to form a traction battery for vehicles of all categories. In contrast to previous projects, the hybrid battery is directly coupled to the vehicle, i. e. operated without an electronic intermediate converter – despite its high voltage of about 400 volts, a BMZ spokesperson said.
In addition to direct coupling, the project will also apply additional measures to extend the driving range. The energy storage system is integrated into a superordinate energy and thermal management system in the vehicle. In this context, the use of heat pumps in the vehicle and battery and vehicle temperature control with thermal pre-conditioning from the electrical network, optimized in terms of range, are planned.
Participating in the project are the Fraunhofer Institute IWES as consortium leader, vehicle tuning company ABT, development services provider Bertrandt, battery manufacturer BMZ Group, as well as the university of Kempten and the thermosystem specialist Konvekta AG.
BMZ is responsible for the battery design and production as well as the optimization of BMS algorithms for the simultaneous operation of different cell technologies. In the development of the hybrid energy storage unit, BMZ focuses on the design of the active cooling system. In order to ensure safe operation, constant performance and a long service life, a homogeneous temperature distribution of all cells within the “comfort range” must be ensured when high-power and high-energy cells are connected directly.
Bertrandt is responsible for the development of an intelligent energy management system to optimize the range of the vehicle. The functions also include recommendations for action for the driver to encourage reduced energy consumption.
The hyPowerRange research project is expected to be completed by the end of 2019. The new modular and flexible battery concept will be integrated as an example into an electric vehicle and will be tested and demonstrated in both driving and charging operation on the electrical grid from 2019 onwards.
The project is funded by the Federal Ministry of Economics and Energy (BMWi).