UDS-KPM-094-01B-2
11
2.2.3 Wiring
Incorrect or incomplete battery wiring may cause the battery to heat up, ignite and/or explode.
Wire correctly by following the precautions and procedures below.
Main Circuit Wiring Precautions
● When wiring, wear safety glasses, rubber gloves, and rubber sole shoes.
● To prevent accidental short-circuits to the battery, all metal tools and jigs shall be
insulated. Also, remove all metallic items (watch, metal ruler, etc.) before beginning
work.
● Only one person should install a wiring cable to each battery terminal; do not wire
multiple locations with two or more people at a time (Battery terminal tightening may be
forgotten.)
● Do not apply a torque larger than the specified value (10 Nm). Otherwise, the battery may
be damaged.
● Do not short-circuit the (+) terminal and the (─) terminal, the (+) terminal and the battery
rack, or the (─) terminal and the battery rack. Wiring and cable insulation should be
selected so that normal degradation of the insulation will not cause short-circuits as
described above.
● Limit the thickness of the cable connected to the battery terminal to 60 mm
2
or less and
use a wire gauge appropriate to the conduction current. The crimp terminal size is M8. In
lieu of a cable, a copper bar may be used to connect to the battery terminal. The copper
bar maximum dimensions are 20 to 25 mm Width × 2 to 4 mm Thickness.
● For tightening the nuts of the battery module terminals, use the enclosed nut.
Main Circuit Wiring Procedure
Step 1: Verify the following battery module voltages prior to connection.
[A] When connecting two (2) or more battery modules in series:
Do not mix* old and new batteries together.
The voltage of the battery modules in series must be the same.
(The difference of the module voltage is within 0.7 V.)
* Do not mix new batteries with old batteries or do not connect batteries with different type of
voltage in series. Battery performance may be degraded.
[B] When connecting two (2) or more battery modules in parallel:
The voltage of the battery modules in parallel must be the same.
(The difference in the module voltage should be within 0.7 V.)
WARNING: Connecting modules with different voltages in parallel will cause a cross current
between modules and is extremely dangerous.
* Contact us for series/parallel connection.