1) The document describes using PSpice to model the power management of hybrid circuits combining batteries and electric double-layer capacitors (EDLCs). 2) It presents three circuit configurations - battery only, battery and EDLC, and compares the state of charge (SOC) of the lithium ion battery for each. 3) The battery and EDLC hybrid circuit uses the EDLC to handle currents above 0.6A while the battery manages currents below 0.6A, keeping the battery SOC higher than when used alone.

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

2. 1.Circuit Method
2.Battery System only
3.Battery and EDLC System
4.Conclusion
PSpice 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
ILOAD
T1 = 0
T2 = 2.5s
I1 = 0
I2 = {Max_Load}
I3 = {Min_Load}
I4 = {Min_Load}
I5 = {Max_Load}
I6 = {Min_Load}
T3 = 5s
T4 = 100s
T5 = 200s
T6 = 300s
0 0
Load
PARAMETERS:
Max_Load = 1.5
Min_Load = 0.5

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
5Copyright (C) Siam Bee Technologies 2015
ILOAD
T1 = 0
T2 = 2.5s
I1 = 0
I2 = {Max_Load}
I3 = {Min_Load}
I4 = {Min_Load}
I5 = {Max_Load}
I6 = {Min_Load}
T3 = 5s
T4 = 100s
T5 = 200s
T6 = 300s
0 0
Load
PARAMETERS:
Max_Load = 1.5
Min_Load = 0.5
IN-
OUT+
OUT-
IN+ G1
LIMIT(V(%IN+, %IN-)/10u, 0 , I(Load))
VBAT
0
0
DIS_BAT
+ -
U1
LI-ION_BATTERY
SOC = 1
NS = 1
TSCALE = 1
C = 2

6. 2.Battery System only
Current Load
Battery Voltage
Battery SOC(%): 100->91.64
6Copyright (C) Siam Bee Technologies 2015

7. 3.Battery and EDLC System
7Copyright (C) Siam Bee Technologies 2015
PARAMETERS:
Dis_SW = 0.6A
ILOAD
T1 = 0
T2 = 2.5s
I1 = 0
I2 = {Max_Load}
I3 = {Min_Load}
I4 = {Min_Load}
I5 = {Max_Load}
I6 = {Min_Load}
T3 = 5s
T4 = 100s
T5 = 200s
T6 = 300s
0 0
PARAMETERS:
Max_Load = 1.5
Min_Load = 0.5
Load
0
DIS_EDLC
IN+
IN-
OUT+
OUT-
E2
IF(I(Load)>Dis_SW, 1, 0)
00
IN-
OUT+
OUT-
IN+
G2
LIMIT(V(Ctrl_EDLC, 0)/10u, 0, I(Load))
+
-
+
-
S2
VON = 0.5
VOFF = 0.3
ROFF = 100e6
RON = 1u
0
0
Ctrl_EDLC
U2
EDLC_MODEL
VRATE = 4.2
VINT = 4.2
CAP = 50
ESR = 0.13
TSCALE = 1
0
VEDLC
0
0
DIS_BAT
IN+
IN-
OUT+
OUT-
E1
IF(I(Load)>Dis_SW, 0, 1)
0
Ctrl_BAT
0
IN-
OUT+
OUT-
IN+
G1
LIMIT(V(Ctrl_BAT, 0)/10u, 0, I(Load))
+
-
+
-
S1
VON = 0.5
VOFF = 0.3
ROFF = 100e6
RON = 1u
0
0
+ -
U1
LI-ION_BATTERY
SOC = 1
NS = 1
TSCALE = 1
C = 2
VBAT

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