Lube-Tech
Figure 5: A battery test rig incorporating dummy battery cells immersed in dielectric fluid.
This test bench was conceived to demonstrate the performance of this type of solution and the results have been published in an SAE paper [12]. The solution’s potential is confirmed by Figure 6 which extrapolates the temperature of the electrochemical cells during a rapid charge of a 50kWh battery pack.
PUBLISHED BY LUBE: THE EUROPEAN LUBRICANTS INDUSTRY MAGAZINE
No.139 page 5
and integrate it in their vehicles in a technically and economically viable way, while the work of TotalEnergies is to enhance the solution’s techno- economic trade-off.
In parallel to these tests, the development process also included a significant amount of simulation with a view to obtaining a correlation between the digital and experimental data so as to be able to extrapolate the results of the simulations and apply them to real cases, using the automobile manufactures’ CAD systems. Figure 7, for example, shows the digital simulation of the experimental test rig described in Figure 5.
Figure 7: Digital simulation of the experimental test rig described in Figure 5.
Figure 6: Cell temperature during the rapid charge of a 50kWh battery pack. The colours represent different levels of charging power.
The results show how this technology makes it possible to achieve particularly efficient cooling performance (target temperature: <30°C), even in the case of chargers not yet available on the market (>300kW). The flow and quantity of fluid required to achieve this level of performance is important. Above all, it is necessary to understand the solution’s potential as revealed by this graph. The work of the automobile manufacturers is to optimise it
30 LUBE MAGAZINE NO.168 APRIL 2022
Thanks to the global results of this test work, it was possible to optimise the fluids employed for battery thermal management. Work was also carried out on the fluids’ environmental impact thanks to an eco-design taking into account their life cycle as presented in Table 2.
Table 2: Characteristics of Quartz EV Battery Fluid – Eco-Friendly.
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