The Battery
The Smart electric drive has a liquid cooled traction battery pack. It consists of 93 li-ion cells and has a maximum voltage of 390V. Within the battery pack are three modules with 31 cells. Each cell is kept in a lightweight aluminum frame for stacking.
On top of the module are two cooling plates for heat dissipation by the coolant. Each module has it's own supervisory electronics for voltage measurement and balancing control of the cells. It will also monitor the temperature with three sensors (Theta 1..3)
Here you find an overview of the battery system and the technical data:
Thanks to Sonny Dahunsi, I can show some of the insights into a Smart ED3 battery module he opened from a salvage car. His findings will be documented here.
Cover removed and some first measurements:
pictures of the battery: (c) 2017 by my brave friend Sonny Dahunsi
| manufacturer | Deutsche ACCUmotive GmbH & Co. KG |
|---|---|
| type | E18-1 EV Batterie |
| number of cells | 93 |
| manufacturer of cells | LiTec Battery GmbH |
| type of cells | HEA-50 |
| nominal voltage | 339 V |
| rated capacity | 52 Ah |
| watt-hour rating | 18000 Wh |
| calculated watt-hour rating | 17628 Wh |
| nominal power | 70/110 kW |
| mass | 179 kg |
| size | (1105 x 587 x 195) mm |
source: BAM Federal Institute for Materials Research and Testing, page 4.