The battery is a very important component as a source of energy to drive an electric car. The capacity of using the battery adjusts to the load supplied. The use of batteries in addition to supplying loads is a storage of electrical energy. Methods of storing electrical energy in batteries can use a generator or power supply. This paper discusses the optimal charging system design for lead-acid-calcium batteries in the UNY 2020 electric car. The proposed charging system uses constant current (CC) and constant voltage (CV) based on the 3-stage charging process used. In the design, the characteristic curve of voltage, current, state of charge (SoC) is obtained. The design simulation results show the battery performance during the charge and discharger cycle process for 75 times with the bulk stage, absorption stage, and float stage.

At this time, there are many electric vehicle manufacturers in Indonesia. The main obstacle in building electric vehicles is the electric motor control system, usually electric vehicles use the BLDC motor type. However, this type of motor has more complex control than conventional DC motors, it requires an encoder sensor to read the rotation of the motor with high accuracy, and a motor controller that can accurately control the amount of current in the motor. Based on the problem, the purpose of this study is to analyze the BLDC motor current control system using odrive motor driver and PI regulation, so that PI parameter values can be obtained to obtain a stable motor current control system, which can also produce system stability with small errors when the system is running. The results of the study show that variations in the value of the PI constant and the load affect the stability parameters of the system under steady-state error, rise time, and overshoot. At the same time, a change in the PI constant does not have a significant effect on the stability parameters of the system.