4.2.8. Connect Link Bus
The Link Bus connector provides power and communication to the Cell Interface modules. The
amount of current supplied by this connector is the sum of current consumed by all Cell Interface
modules in the system.
Typically, the Link Bus is connected to the Cell Interface module which is measuring the most
negative cell, with each subsequent Cell Interface module measuring increasingly positive cells.
Although any order of the Cell Interface modules in the Link Bus chain can be acceptable, the order of
the cells in the software registers and the Operator Interface may be not be as intuitive as the
aforementioned order (i.e. order of increasing potential).
If the Cell Interface modules are not already connected to the battery (e.g. battery cell connection,
temperature sensors, and Link Bus cables between the Cell Interface modules), this can be done now.
For instructions on connecting the Cell Interface modules to the battery, refer to
Install the Link Bus cable between the Stack Switchgear and the first Cell Interface in the Link Bus
chain.
4.2.9. Connect Battery Stack and DC Bus
Due to the nature of batteries, live voltages are always present; for this reason,
these connections should be completed last. In order to reduce the risk of a short,
only install one connection at a time.
The Stack Switchgear is configured for a specific battery topology based on the
details provided to Nuvation Energy during order fulfillment. Failure to use the same
number of Cell Interface modules and/or using a different battery topology will result
in undesirable Stack Switchgear behavior. Please contact
if there is a change in the system design that would
require a Stack Switchgear configuration update.
The front panel of the Stack Switchgear has four high power connectors, as illustrated by
.
Two of these are for the positive and negative terminals of the battery stack; the other two are for
the connection to the DC bus (or a power conversion system in a single stack system).
The colors are coordinated such that red is for the positive connections and black is for the negative
connections. The connectors use #M8 screws (included) and are intended for #M8 lugs (not included,
e.g. Panduit Corp LCMA50-8-L).
Flexible snap-on terminal covers are included. The maximum acceptable terminal lug tongue width is
1.1 inches and the the maximum wire size is 4/0.
The recommended tightening torque is 5.7 to 6.8 N-m [50 to 60 in-lbs].
Table 7. Battery Stack and DC Bus Connector Assignment
Nuvation Energy High-Voltage BMS - Product Manual
Document ID: NE-PM-003
23
Rev 1.2, 2021-03-03
Curie Update 1
