The document describes how to design a hybrid power management circuit for batteries and electric double-layer capacitors (EDLCs) using LTspice software. It presents models for lithium-ion batteries and EDLCs, and shows a circuit where the EDLC handles currents over 0.6A and the battery handles currents below 0.6A. The conclusion is that a hybrid battery-EDLC circuit performs better than a battery-only system for applications with high, quick current waveforms, as it maintains a higher battery state of charge.

1. 28APR2015
Bee Technologies
http://www.bee-tech.info/
How to Design of Power Management of
Hybrid Circuit(Battery and EDLC)
using LTspice Simple Model
LTspice Version
1Copyright (C) Siam Bee Technologies 2015

2. 1.Circuit Method
2.Battery System only
3.Battery and EDLC System
4.Conclusion
LTspice Version
SPICE Model using Simple Model by Bee Technologies
Lithium Ion Battery Model
http://www.bee-tech.info/simple-model-for-spice/lithium-ion-battery-model/
Electric Double-Layer Capacitor Model
http://www.bee-tech.info/simple-model-for-spice/edlc-model/
2Copyright (C) Siam Bee Technologies 2015

3. 1.Circuit Method
Battery System only Hybrid(Battery and EDLC) System
Lithium
Ion
Battery
Current
Load
Lithium
Ion
Battery
Current
Load
EDLC
Control
Current Load Profile
Hybrid(Battery and EDLC) System
If Current load >0.6[A], EDLC work
If Current load =<0.6[A], Lithium Ion Battery work
3Copyright (C) Siam Bee Technologies 2015

4. 1.Circuit Method
Current Load Profile
Hybrid(Battery and EDLC) System
If Current load >0.6[A], EDLC work
If Current load =<0.6[A], Lithium Ion Battery work
EDLC work
Lithium Ion Battery work
4Copyright (C) Siam Bee Technologies 2015

5. 2.Battery System only
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6. 2.Battery System only
Current Load
Battery Voltage
Battery SOC(%): 100->91.64
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7. 3.Battery and EDLC System
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8. Control
Battery Voltage
Battery SOC(%): 100->94.32
3.Battery and EDLC System
Current Load
EDLC Voltage
8Copyright (C) Siam Bee Technologies 2015

9. 4. Conclusion
Battery System only Hybrid(Battery and EDLC) System
Lithium
Ion
Battery
Current
Load
Lithium
Ion
Battery
Current
Load
EDLC
Control
SOC[%]
Start Stop
Lithium Ion
Battery
100 91.64
SOC[%]
Start Stop
Lithium Ion Battery 100 94.32
If high Current wave form quickly, Hybrid Circuit is better.
9Copyright (C) Siam Bee Technologies 2015