NISSAN 2009 Altima Hybrid - First Responder's Guide - Manual (Page 9)

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Battery Information
The Altima Hybrid utilizes two batteries in order to supply both high and low voltage.
Low Voltage Battery
The Altima Hybrid contains a lead-acid 12 volt DC low voltage battery.
The low voltage battery is located in the passenger rear quarter panel
well of the trunk and is concealed by a trim cover. The negative (-) 12
volt battery cable can be accessed through an access panel in the
trim cover.
The 12 volt battery powers the vehicle’s 12 volt electrical system,
similar to a conventional vehicle. As with conventional vehicles, the 12
volt battery is grounded to the metal chassis of the vehicle. However,
the 12 volt battery is charged by the high voltage battery through the
DC/DC converter.
High Voltage Battery
The Altima Hybrid contains a Ni-MH 245 volt DC high voltage battery.
The high voltage battery is enclosed in a metal case, which is isolated
from high voltage, and is securely mounted in the trunk area behind
the rear seat and is concealed by a trim cover. The service disconnect
can be accessed through an access panel in the trim cover.
The 245 volt battery powers the vehicle’s high voltage electrical
system. The high voltage battery consists of 34 low voltage (7.2 volt)
Ni-MH battery modules connected in series to produce approximately
245 volts DC. Each Ni-MH battery module is sealed in a non-spillable
plastic case. The electrolyte used in the Ni-MH battery module is an alkaline mixture of potassium and sodium
hydroxide. The electrolyte is absorbed into the battery cell plates and forms a gel that should not normally leak,
even in a collision. In the unlikely event that the high voltage battery is overcharged, the modules vent gases
directly outside the vehicle through a vent hose.
An air vent is located on the rear parcel shelf to cool the high voltage
battery. If the vent is covered, the battery will overheat, resulting in
reduced output performance of the hybrid system.
The high voltage battery supplies power to the following:
•
Power cables
•
EPS DC/DC converter
•
DC/DC converter
•
Inverter unit
•
Transaxle
•
Electric air conditioning compressor