Table Of ContentLithium-Ion Batteries and Applications
A Practical and Comprehensive Guide
to Lithium-Ion Batteries and Arrays,
from Toys to Towns
Volume 1
Batteries
For the Artech House Power Engineering Library
go to the back of this book.
Lithium-Ion Batteries and Applications
A Practical and Comprehensive Guide
to Lithium-Ion Batteries and Arrays,
from Toys to Towns
Volume 1
Batteries
Davide Andrea
Library of Congress Cataloging-in-Publication Data
A catalog record for this book is available from the U.S. Library of Congress.
British Library Cataloguing in Publication Data
A catalog record for this book is available from the British Library.
ISBN-13: 978-1-63081-767-1
Cover design by John Gomes
© 2020 Artech House
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10 9 8 7 6 5 4 3 2 1
To Ann
CONTENTS
PREFACE XIX
What This Book Is . . . . . . . . . . . . . . . . . . . . . . . xix
What This Book Is Not . . . . . . . . . . . . . . . . . . . . . xix
Intended Audience . . . . . . . . . . . . . . . . . . . . . . . xix
Motivation . . . . . . . . . . . . . . . . . . . . . . . . . . xix
Beyond This Book . . . . . . . . . . . . . . . . . . . . . . . .xx
The Most Important Takeaway . . . . . . . . . . . . . . . . . . .xx
Orientation . . . . . . . . . . . . . . . . . . . . . . . . . .xx
About This Book . . . . . . . . . . . . . . . . . . . . . . . xxi
About Me . . . . . . . . . . . . . . . . . . . . . . . . . . xxii
About My Company . . . . . . . . . . . . . . . . . . . . . . xxii
About the Contributors . . . . . . . . . . . . . . . . . . . . . xxii
Reference . . . . . . . . . . . . . . . . . . . . . . . xxii
CHAPTER 1
FUNDAMENTAL CONCEPTS 1
1.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . 1
1.1.1 Tidbits . . . . . . . . . . . . . . . . . . . . . . . 1
1.1.2 Orientation . . . . . . . . . . . . . . . . . . . . . 1
1.2 Symbols and Terms . . . . . . . . . . . . . . . . . . . . . . 2
1.2.1 Symbols . . . . . . . . . . . . . . . . . . . . . . 2
1.2.2 Terms . . . . . . . . . . . . . . . . . . . . . . . 3
1.3 Common Misunderstandings . . . . . . . . . . . . . . . . . .12
1.3.1 Charging While Discharging . . . . . . . . . . . . . . .13
1.3.2 The Load Sets the Current . . . . . . . . . . . . . . .14
1.3.3 No Voltage Across a Switch . . . . . . . . . . . . . . .14
1.3.4 Power Supply Versus Charger . . . . . . . . . . . . . . .15
1.3.5 Ohm’s Law . . . . . . . . . . . . . . . . . . . . .15
1.4 Measures . . . . . . . . . . . . . . . . . . . . . . . . .16
1.4.1 Charge and Coulombic Efficiency . . . . . . . . . . . . .17
1.4.2 Capacity [Ah] . . . . . . . . . . . . . . . . . . . .19
1.4.3 Current and Specific Current . . . . . . . . . . . . . . .23
vii
viii CONTENTS
1.4.4 Energy, Energy Density, Specific Energy, Efficiency . . . . . . .26
1.4.5 Power, Power Density, Specific Power, Efficiency . . . . . . . .29
1.4.6 Resistance and Impedance [Ω] . . . . . . . . . . . . . .31
1.4.7 Capacitance [F] . . . . . . . . . . . . . . . . . . . .32
1.5 Maximum Power Point and Maximum Power Time . . . . . . . . . .32
1.5.1 Maximum Power Point . . . . . . . . . . . . . . . . .32
1.5.2 Maximum Power Time . . . . . . . . . . . . . . . . .34
1.5.3 MPT Definition . . . . . . . . . . . . . . . . . . .34
1.5.4 MPT Empirical Characterization . . . . . . . . . . . . .35
1.5.5 MPT Derivation from Specs . . . . . . . . . . . . . . .36
1.5.6 Typical Values of MPT . . . . . . . . . . . . . . . . .37
1.5.7 MPT Conversions . . . . . . . . . . . . . . . . . . .38
1.5.8 Using the MPT . . . . . . . . . . . . . . . . . . .40
1.6 States . . . . . . . . . . . . . . . . . . . . . . . . . .41
1.6.1 States of Alphabet Soup . . . . . . . . . . . . . . . . .41
1.6.2 State of Charge . . . . . . . . . . . . . . . . . . . .41
1.6.3 State of Energy . . . . . . . . . . . . . . . . . . . .43
1.6.4 State of Health . . . . . . . . . . . . . . . . . . . .44
1.6.5 Other “State of” . . . . . . . . . . . . . . . . . . .45
1.6.6 Depth of Discharge . . . . . . . . . . . . . . . . . .46
1.6.7 Charge Acceptance, Discharge Availability . . . . . . . . . .46
1.7 Charts . . . . . . . . . . . . . . . . . . . . . . . . . .47
1.7.1 Radar Chart . . . . . . . . . . . . . . . . . . . . .47
1.7.2 Ragone Plot . . . . . . . . . . . . . . . . . . . . .50
1.7.3 MPT-Based Plots . . . . . . . . . . . . . . . . . . .53
1.8 Devices Used with Batteries . . . . . . . . . . . . . . . . . .56
1.8.1 Power Converters . . . . . . . . . . . . . . . . . . .56
1.8.2 AC to DC: Chargers and Power Supplies . . . . . . . . . . .59
1.8.3 DC to DC: DC Chargers and DC-DC Converters . . . . . . .60
1.8.4 DC to AC: Inverters, Invergers, and AC Motor Drivers . . . . . .60
1.8.5 AC to AC: Transformers and Variable Frequency Drives . . . . .62
1.8.6 Any Direction: Transverters . . . . . . . . . . . . . . .62
References . . . . . . . . . . . . . . . . . . . . . . . .63
CHAPTER 2
LI-ION CELL 65
2.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . .65
2.1.1 Tidbits . . . . . . . . . . . . . . . . . . . . . . .65
2.1.2 Orientation . . . . . . . . . . . . . . . . . . . . .65
2.1.3 Li-Ion Cell Definition . . . . . . . . . . . . . . . . .66
2.2 Types of Cells . . . . . . . . . . . . . . . . . . . . . . . .68
2.2.1 Cell Chemistry . . . . . . . . . . . . . . . . . . . .68
2.2.2 Cell Formats . . . . . . . . . . . . . . . . . . . . .71
2.2.3 Energy Versus Power Cells . . . . . . . . . . . . . . . .75
2.2.4 Cell Modules . . . . . . . . . . . . . . . . . . . .76
2.3 Cell Characterization . . . . . . . . . . . . . . . . . . . . .76
CONTENTS ix
2.3.1 Perspectives for Characterization . . . . . . . . . . . . .77
2.3.2 Safe Operating Area . . . . . . . . . . . . . . . . . .77
2.3.3 Abuse . . . . . . . . . . . . . . . . . . . . . . .79
2.3.4 Equivalent Model . . . . . . . . . . . . . . . . . . .79
2.3.5 Cell Life . . . . . . . . . . . . . . . . . . . . . .80
2.4 Voltage and State of Charge . . . . . . . . . . . . . . . . . . .81
2.4.1 Voltage Ranges . . . . . . . . . . . . . . . . . . . .81
2.4.2 Terminal Voltage and Open-Circuit Voltage . . . . . . . . . .83
2.4.3 Cell SoC . . . . . . . . . . . . . . . . . . . . . .87
2.4.4 Voltage vs. SoC . . . . . . . . . . . . . . . . . . . .87
2.4.5 Differential OCV versus SoC . . . . . . . . . . . . . . .95
2.4.6 Expansion and Contraction . . . . . . . . . . . . . . .98
2.5 Capacity, Coulombic Efficiency, and Energy . . . . . . . . . . . . .99
2.5.1 Capacity . . . . . . . . . . . . . . . . . . . . . 100
2.5.2 Capacity Fade over Time: Calendar Life . . . . . . . . . . 100
2.5.3 Capacity Fade During Use: Cycle Life . . . . . . . . . . 100
2.5.4 Coulombic Efficiency . . . . . . . . . . . . . . . . 107
2.5.5 Energy . . . . . . . . . . . . . . . . . . . . . . 111
2.5.6 Energy Density and Specific Energy . . . . . . . . . . . 112
2.5.7 Energy Efficiency . . . . . . . . . . . . . . . . . . 112
2.6 Resistance, Impedance, Maximum Power Time . . . . . . . . . . . 112
2.6.1 Resistance . . . . . . . . . . . . . . . . . . . . 112
2.6.2 Maximum Power Time . . . . . . . . . . . . . . . . 114
2.6.3 Impedance . . . . . . . . . . . . . . . . . . . . 117
2.7 Current, Power, and Self-Discharge . . . . . . . . . . . . . . . 118
2.7.1 Current . . . . . . . . . . . . . . . . . . . . . 118
2.7.2 Power . . . . . . . . . . . . . . . . . . . . . . 120
2.7.3 Self-Discharge Current . . . . . . . . . . . . . . . . 122
2.8 Cell Selection and Procurement . . . . . . . . . . . . . . . . 124
2.8.1 Liars, Damn Liars, and “Battery Suppliars” . . . . . . . . . 124
2.8.2 Types of Specification Sheets . . . . . . . . . . . . . . 125
2.8.3 Reading Specification Sheets . . . . . . . . . . . . . . 126
2.8.4 Cell Sourcing . . . . . . . . . . . . . . . . . . . 133
2.8.5 Second Use . . . . . . . . . . . . . . . . . . . . 133
2.9 Cell Testing . . . . . . . . . . . . . . . . . . . . . . . 135
2.9.1 OCV versus SoC curves and Table . . . . . . . . . . . . 135
2.9.2 Charge and Discharge Curves . . . . . . . . . . . . . 138
2.9.3 Electrochemical Impedance Spectroscopy . . . . . . . . . 138
2.9.4 Mechanical Test . . . . . . . . . . . . . . . . . . 138
2.9.5 Calendar Life . . . . . . . . . . . . . . . . . . . 139
2.9.6 Cycle Life . . . . . . . . . . . . . . . . . . . . 140
References . . . . . . . . . . . . . . . . . . . . . . . 141
CHAPTER 3
CELL ARRANGEMENT 143
3.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . 143