Battery Management System
The Battery Management System (BMS) is designed to monitor and manage Frazer-Nash battery packs and to interface with other systems which require information on the State-of-Charge (SoC) and condition of the battery pack. It is one of the most advanced systems of its kind in the world and is essential to ensure safety in use and a long life for the battery pack.
The BMS is offered with the Slaves in an industry standard half Eurocard format, which allows the user to quickly develop a prototype system to evaluate the performance and establish suitability of the system as a whole.
Experience has shown that by integrating the design of the BMS with the mechanical design of the battery pack as a whole then substantial savings in size, weight and cost can be achieved.
Battery DESIGN & SIMULATION
FNES has a full battery design, simulation and validity capability. From the customer specification, we are able to perform the electrical and mechanical design, electrical and thermal simulation, BMS integration, thermal validation using CFD, and manufacture prototypes that are ready to be installed in the customer’s vehicle.
Developed by Frazer-Nash Energy Systems, the DC-DC converter steps down the high voltage of an electric vehicle or hybrid-electric vehicle battery pack to the lower voltage required to power the majority of the ancillary systems on the vehicle such as lighting, wipers and fans/blowers.
To keep the system intrinsically safe, the low voltage circuits are isolated from the traction battery circuit so that there is no common conduction path. It uses high frequency switching techniques, minimising size of the module and provides excellent efficiency. The unit is water-cooled which further improves thermal efficiency.
Included in the DC-DC design is a control and monitoring unit. This allows the status of the auxiliary supply system to be assessed by the centralised controller.
Portable Electric Vehicle Supply Equipment
Portable Electric Vehicle Supply Equipment (EVSE) is also available to facilitate 'home' charging from a conventional mains socket.
This contains the necessary safety isolation and detection circuitry, together with industry standard vehicle connectors, to ensure compatibility with charging stations and other charge mains outlets.
Frazer-Nash Energy Systems has developed domestic and commercial vehicle chargers. The chargers are designed to have a typical output power of 3kW with efficiencies of 90% and are compatible with most domestic main supplies. They are available as air cooled stand alone off-board units or as fully J1772 compliant liquid cooled on-board units.
Higher output chargers are also available for specific applications.
Electrical Machine design
FNES has the capability to design and manufacture PMSAC electrical machines targeted at the automotive market. Throughout the design process the optimisation of performance, weight, cost and reliability are supported by an in depth understanding of automotive validation procedures and the selection of appropriate production technologies.
Analysis of the machines magnetic circuit would typically include the use of FEA whilst thermal performance is checked and simulated by an advanced CFD package. Mechanical design extends beyond casing, cooling and bearing selection to consider issues such as integration into the vehicle, NVH and where appropriate crash. Durability is also assessed using mechanical FEA and other related methods recognised by the automotive industry.