Design of a 72 V 40 Ah Electrical System Battery Pack for Electric Motorcycle

In Indonesia, there are many industrial electric motorcycle battery packs on the market with different voltages and different charging communication systems. This is because there is no standard used in Indonesia. However, currently many batteries circulating in Indonesia uses a voltage of 72 V with a capacity of 20 Ah. Therefore, this study aims to design a battery pack with a specification of 72 volts with a capacity of 40 Ah. The advantage of the results of the battery pack design in this study is that it has the same dimensions and weight as battery packs on the market but has twice the capacity of 40 Ah so that electric motorbikes can travel farther than those in circulation. Based on the research results of BMS monitoring, it is estimated that charging 100^% at a voltage of 70.7 Volts. The difference in voltage in the battery management system and the results of the analysis calculations is caused by variations in the voltage in each battery cell. Technically the difference between each battery cell under 2 Volts will not be a problem as long as the BMS used has an active battery cell voltage balancing feature. In the dyno test results for each additional speed the battery can function properly at any given torque variation. In the next stage this battery pack can be used for electric motor vehicles to measure the maximum mileage.

I. Introduction

Currently, there are electric vehicle companies and assembly workshops in Indonesia that are capable of assembling electric vehicle batteries, but none have been tested or certified for safety. Standardization is very important, because conditions that do not meet the standard have potential to cause problems. The potential hazard of electric motor batteries is very important, statistics show that battery packs account for the highest percentage of explosions. These battery packs are used in electric motors [1].