Design of a Test Platform for the Determination of Lithium-Ion Batteries State of Health

Jules-Adrien Capitaine,Qing Wang

doi:10.1115/1.4041855

Abstract

This paper presents a novel design for a test platform to determine the state of health (SOH) of lithium-ion batteries (LIBs). The SOH is a key parameter of a battery energy storage system and its estimation remains a challenging issue. The batteries that have been tested are 18,650 Li-ion cells as they are the most commonly used batteries on the market. The test platform design is detailed from the building of the charging and discharging circuitry to the software. Data acquired from the testing circuitry are stored and displayed in LabVIEW to obtain the charging and discharging curves. The resulting graphs are compared to the outcome predicted by the battery datasheets, to verify that the platform delivers coherent values. The SOH of the battery is then calculated using a Coulomb counting method in LabVIEW. The batteries will be discharged through various types of resistive circuits, and the differences in the resulting curves will be discussed. A single battery cell will also be tested over 30 cycles and the decrease in the SOH will be clearly identified.

Highlights

Lithium-Ion batteries (LIB) have become a power source of choice in the electronics market and are currently produced at a rate of billions of units per year [1]
This paper focuses on this determination via the designing of a test platform for Lithium-ion batteries
It has been verified that it calculated coherent values of State of Health (SOH)

Summary

Introduction

Lithium-Ion batteries (LIB) have become a power source of choice in the electronics market and are currently produced at a rate of billions of units per year [1]. This growing interest in LIBs is due to their portability, their use in devices such as laptops, tablets and phones, as well as their high specific energy. Their specific energy is situated between 100 and 200Wh/kg, whereas lead acid, NiCd and NiMH batteries obtain approximately 10-50Wh/kg, 25-70Wh/kg and 70-100Wh/kg respectively [2]. As a matter of fact, in 2015, more than 3,000 million hybrid electric vehicles were sold worldwide, and more than 15% of the batteries were LIBs [1]

Methods

Results

Conclusion