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When the themal management system is installed and connected, the battery module fluid channels
are still full of air. For optimal performance the air must be removed from the battery module. In
order to remove the air, the it is best to rinse each battery module with 3 liters per minute for
approximately 5 minutes.
Make sure the fluid level in the thermal management system is sufficient and/or filled-up while
rinsing the battery modules. Each module requires about 2 liters of fluid. Excessive air must be bled
from the system if not done automatically.
8.7
PPS connection
Make sure the used tubing has an internal diameter of Ø 10 mm when connecting the PPS fluid. It is
recommended to connect 12 liters of PPS fluid, presurrised to 2 – 3 bar gauge pressure, for up to six
batteries modules in parallel. It is mandatory to use at least one PPS per battery string.
It is advisible to equip the PPS with a electronic pressure measurement device so an automatic alarm
can be raised if the pressure drops below a threshold.
An example setup is given in figure 21 below. It is wise to install a means to bleed air from the
system at the end of a parallel connection line.
Figure 21 - Example PPS connection scheme
The hose tail connection is of the same type as the thermal management connection. Instruction
stated in section 8.6 can be used as an example.
Once all connections are made, the system can be filled with the PPS fluid and pressurised to 2-3 bar
gauge pressure. The last step is to bleed air out of the system. This can be done by opening the air
beelding valve until the PPS fluid comes out. Check the pressure after bleeding the system and bring
it back to 2-3 bar gage pressure.
