Lithium-ion battery cell testing system

2017 ELE Engineering Design Project (DX01)

Faculty Lab Coordinator

David Xu

Topic Category

Power / Controls


Lithium-ion batteries are widely used for electrical and hybrid vehicles. The battery cells are connected together to form a battery module (pack). Then modules are connected in serial to form the battery system, which is used to power the EV. In order to better utilize the battery capacity, battery cells are tested and selected before packing together. The testing system will identify the cell capacity, cell voltage, cell internal resistance and other key parameters. Cells with similar parameters will be packed together. The purpose of this project is to develop a automatic testing system.


The objective of this project is to develop an automatic battery testing system. The system can automatically test the battery cell capacity, cell voltage, internal impedance and other key parameters.

Partial Specifications

The testing system include:
1) A programmable power supply, which can output 0-6V and 0-5A DC voltage/current to charge and discharge the battery. The voltage/current accuracy should be <=0.1% at full scale.
2) A micro-controller system, which control the programmable supply to performance the automatic testing.
3) A local display to show the testing results, include capacity, cell voltage and internal resistance.
4)Protection system, which can protect reverse connection, battery over charging, battery over heat.

Suggested Approach

It is suggested that project should contain following components:
1) A programmable supply hardware, either linear programmable DC supply or digital supply, which can satisfy the specification.
2) A micro-controller which can control the supply to performance the testing procedures.
3) A high resolution measurement system, which can be interfaced with the micro-controller.
4) Design a local LCD display. The LCD display is connected to the micro-controller

Group Responsibilities

The group should be responsible for the whole project including overall design of the system. The group also responsible for design the testing procedures of the battery parameters. Implement and test the entire system. Follow the project management. Project report and demo are the group responsibility

Student A Responsibilities

Student A should design the programmable power supply. The supply can accept the command from the micro-controller and perform the internal control of the output voltage and/or current. The programmable supply should be able to protect the battery from reverse connection.

Student B Responsibilities

Student B should design the high resolution measurement system for the micro-controller. To achieve 0.1% accuracy of the voltage/current measurement, external A/D converters are necessary. Sensors, analog circuit and digital interface are the main responsibilities of student B.

Student C Responsibilities

Student C should responsible for selecting the micro-controller with LCD display and program the micro-controller to perform the measurement of the battery. The micro-controller also need to protect he battery from over charging and over heating.

Course Co-requisites


DX01: Lithium-ion battery cell testing system | David Xu | Not yet submitted at No time