Performance Analysis of Three Types of Single Cell Lithium Batteries

Battery Types

Overview

The aim of the assignment will be to characterise the performance of 3 different types of single cell lithium batteries. This will be achieved practically by using a constant current discharge (energy) and pulse capacity charge / discharge (power) test, as well as theoretically within a simulated model within Simulink. From the results you will then need to construct a comparative report looking at a range of battery performance indicators and explain the changes from the actual and simulated results.

1. Manufacturer: A123 Model: GTV1 Nominal Voltage: 3.23V

2. Manufacturer: YUASA Model: 25H Nominal Voltage: 3.6V

3. Manufacturer: JSR Model: 3300F Nominal Voltage: 3.0V

You have been given 3 data sheets for the batteries you are to test. You need to enter the batteries key data characteristics into the Simulink battery model block (located in the SimPower toolset) and discharge each battery at its 1C, 2C and 5C ratings using the constant current block (also located within the SimPower toolset) for a simulated period of 1hr (3600 seconds). A scope can be attached to the battery and key characteristics monitored from Simulink and exported to the MATLAB workspace using the output port block for further analysis within your 
final report. NOTE: Ensure your simulated data is fully recorded from its start point (0 seconds) to finish (3600 seconds).

You will now be taken to the battery research laboratory where with technical support you will firstly construct a programme within LCN software to perform the same constant current discharge with the actual lithium cells at 1C, 2C and 5C on the discharge, each time recharging the cells at 0.5C rate. Secondly you will construct a further programme which will discharge each cell to 50% state of charge and additional perform a 1C, 2C and 5C pulse discharge and charge from 50% state of charge.

You will now need to complete a technical write-up firstly giving a step by step account of what you achieved in parts 1 and 2 of the assignment. You should write up the experimental procedures as if you were the instructor so I can determine if you understand the various steps. Then finally with the actual, simulated and theoretical results (spec sheet details) you need to complete a critical analysis comparing the results for following quantities and comments on any discrepancies from what you expected.

1. Specific Power – Watts/Kg
2. Specific Energy – Watthr/Kg
3. Power Density – Watts/Ltr
4. Energy Density – Watthr/Ltr
5. Capacity – Amphr
6. Recharge Capacity efficiency – Percentage
7. Recharge Energy efficiency - Percentage

1. Students will have a detailed understanding of the drive systems and power sources used in Hybrid(EV) vehicles.

2. Students will be able to critically evaluate a hybrid (EV) system so that the maximum power output and fuel efficiencies can be achieved.