Battery Pack Design for Electric Racecar Drive System

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Supervisor:
Dr. Balázs Gergely György
Department of Electric Power Engineering

Abstract

Since 1802, when Johann Wilhelm Ritter created the first rechargeable battery, there is a constantly growing demand for batteries with higher capacity, longer service life and shorter recharge time, to power our cell phones, laptops and now even our cars as well. Nowadays, many manufacturers are involved in development of lithium-ion batteries, among others in the LiFePO4 types. Because of its high capacity, small weight, low self-discharge, and its lower pollution, it is preferred to be used in small electronic devices, but these are cell types which also provide electric power to many electrical vehicles.

This paper explains the newest and most frequently used types of battery technologies as well. Some models are even providing energy to mass-produced electric vehicles, so development of these systems, their positioning in the car frame, and solutions used for increasing are also important elements of this thesis.

The core element of this paper is a battery module for the Formula Student Racing Team Hub Motor Group, so that an energy storage system, which consists of lithium iron phosphate cells. There are specific regulations for batteries in the Formula Student competition rules, which played a decisive role in the final development of the module. The main cell types are compared, with an emphasis on charging parameters of the lithium iron phosphate cells. The paper explains the whole assembling process of the module, including a number of methods for interconnecting the cells, wiring the module to the Battery Management System, and for fastening it to the vehicle frame.

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