2020 KIA OPTIMA HEV battery

H2
HEV (HYBRID ELECTRIC VEHICLE) SYSTEM
The Kia Hybrid Electric Vehicle (HEV) uses both the gasoline engine and the electric motor for power. The electric
motor is run by a 270V high-voltage HEV battery.
Depending on the driving conditions, the HEV computer selectively operates between the engine and the electric
motor or even both at the same time.
Fuel efficiency increases when the engine is at idle, or when the vehicle is driven by the electric motor with the HEV
battery.
The HEV battery charge must be maintained because, at times, the engine may come on even at idle to act as a gen-
erator. Charging also occurs when decelerating or by regenerative braking.
OJFH055281L

H3
PHEV (PLUG-IN ELECTRIC VEHICLE) SYSTEM
The Kia Plug-in Hybrid Electric Vehicle (PHEV) shares the characteristics of both a conventional hybrid electric vehi-
cle and an all-electric vehicle.
When used as a conventional hybrid electric vehicle, the HEV computer selectively operates between the engine and
the electric motor or even both at the same time.
When it is operating in the electric vehicle mode, the vehicle is driven only using the electric motor over a certain dis-
tance until the hybrid battery becomes low. The driving distance in EV mode depends on customer driving style and road
conditions. Aggressive driving maneuvers may at times temporarily enable the engine to operate for maximum power.
The hybrid battery can be fully charged by connecting a plug to an external electric power source.
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Electric Vehicle ModeStart up/Low speedAcceleration High speedDecelerationExternal charging
Electric motor
CD (Charge Depleting) Mode
CS (Charge Sustaining) Mode
Charging
MotorEngine+MotorEngineChargingBattery charging
6

H12
How to Disconnect an ACCharger
1. The vehicle doors must be unlocked in order to be able to dis-
connect the charging connector. A
lock system prevents charger
cable disconnection when the
vehicle's doors are locked.
2. Press the door unlock button onthe smart key.
3. Hold the charging connector han- dle and pull it while pressing the
release button (1).
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Charging StatusIndicator
Charging in
progressIlluminates (green)
Fully chargedOff
Scheduled chargingBlinks (green) and then turns off
Auxiliary battery
saver+ or sched-
uled air conditioner is operatingQuickly blinks
(Green) and then turns off
MalfunctionBlinks (red)
CHARGING THE PLUG-IN HYBRID VEHICLE (CONT.)
CAUTION
In order to disconnect thecharging connector, unlock thedoors to unlatch the chargingconnector lock system. If not,the charging connector and thevehicle's charging inlet may bedamaged.
CAUTION
When disconnecting the charg-ing connector, do not try to dis-connect it by force while notpressing the release button.This may damage the chargingconnector and vehicle charginginlet.

H25
Changing plug-in hybrid mode
Pressing the HEV button changes
the plug-in hybrid system modes,
between Electric (Charge
Depleting/CD) mode and Hybrid
(Charge Sustaining/CS) mode.
Each time the mode is changed a
corresponding message is displayed
on the instrument cluster as follows.
Plug-in hybrid mode indicator
: The high-voltage(hybrid) battery is
used to drive the
vehicle.
: The high-voltage(hybrid) battery
and gasoline
engine is used to
drive the vehicle.
A corresponding message is displayed
to indicate the selected mode.
DRIVING THE HYBRID/PLUG-IN HYBRID VEHICLE
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OJFHP048420N
OJFHP048421N
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H28
✽ ✽NOTICE
Coasting guide is only a supplemen-
tal system to assist with fuel-efficient
driving in certain situations. Thus,
the operating conditions may be dif-
ferent in accordance with
traffic/road conditions (i.e. driving
in a traffic jam, driving on a slope,
driving on a curve). Thus, take the
actual driving conditions into con-
sideration, such as distances from
the vehicles ahead/ behind, while
referring to the coasting guide sys-
tem as guidance.
Unplug vehicle to start
(Plug-in hybrid)
This message is displayed when you
start the engine without unplugging
the charging cable. Unplug the
charging cable, and then start the
vehicle.
Remaining time (Plug-in hybrid)
This message is displayed to notify
the remaining time to fully charge the
battery.
Shift to P to charge(Plug-in hybrid)
This message is displayed when the
charging connector is plugged with
the shift lever in R (Reverse), N
(Neutral) or D (Drive). Move the shift
lever to P (Park) and re-start the
charging process.
Electric/Hybrid modes (Plug-in hybrid)
A corresponding message is dis-
played when a mode is selected by
pressing the HEV button.
Low battery. Maintaining Hybridmode (Plug-in hybrid)
This message is displayed when the
vehicle is unable to convert to EV
mode even when pressing the HEV
button during HEV mode driving due
to insufficient high-voltage (hybrid)
battery level.
Low battery temp. Maintainingcurrent (Plug-in hybrid)
This message is displayed when the
vehicle is unable to convert to EV
mode even when pressing the HEV
button during HEV mode driving due
to low battery temperature.
DRIVING THE HYBRID/PLUG-IN HYBRID VEHICLE (CONT.)

H39
ECONOMICAL and SAFE
OPERATION of Hybrid system
Drive smoothly. Accelerate at amoderate rate and maintain a
steady cruising speed. Don't make
“jack-rabbit” starts. Don't race
between stoplights.
Avoid heavy traffic whenever pos-
sible. Always maintain a safe dis-
tance from other vehicles so you
can avoid unnecessary braking.
This also reduces brake wear.
The regenerative brake generates energy when the vehicle deceler-
ates.
When the hybrid battery power is low, the hybrid system automatical-
ly recharges the hybrid battery.
When the engine runs in “N” posi- tion, the hybrid system cannot gen-
erate electricity. The hybrid battery
cannot recharge in “N” position.
Please refer to chapter 5.
✽ ✽ NOTICE
When the hybrid system is in
READY mode, the engine will auto-
matically start and stop as needed.
The “ ” symbol will illuminate in
the cluster when the system is oper-
ational.
CAUTION- Extended
cranking
Do not crank the engine for aprolonged period of time with-out the engine starting. Thiscould result in damage to theHEV battery and become totallydischarged.

H40
COMPONENTS OF THE HYBRID/PLUG-IN HYBRID VEHICLE
1. Engine : 2.0L
2. Motor : 38kW (Hybrid) / 50kW (Plug-in hybrid)
3. Transmission : 6AT
4. Hybrid starter generator (HSG)5. HPCU (Hybrid Power Control Unit)
6. High voltage battery system
7. Regenerative brake system
8. Virtual Engine Sound System (VESS)
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The actual shape may differ from the illustration.
- PHEV - HEV

H41
The Hybrid battery uses high-voltage
to operate the electric motor and
other components. High voltage is
dangerous if touched.
Your vehicle is equipped with orange
colored insulation which covers over
the high voltage components to pro-
tect people from electric shock.
High voltage warning labels are
attached to some system compo-
nents as additional warnings. Your
vehicle is recommended to be serv-
iced by an authorized Kia dealer.
WARNING - High voltage
components
Never touch orange or high-volt-
age labeled components includ-
ing wires, cables, and connec-
tors. If the insulators or covers
are damaged or removed, severe
injury or death from electrocu-
tion may occur.
WARNING- Touching HPCU
When replacing the fuses in the
engine compartment, never
touch the HPCU. The HPCU car-
ries high voltage. Touching the
HPCU could result in electrocu-
tion, serious injury, or death.
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OJFHQ015003
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HPCU
HEV Battery
PHEV Battery