Abstract: A thermally controllable battery pack includes a scalable number of battery modules. Each battery module includes a group of horizontally stacked battery cells. Thin metal plate housing surrounds the modules. A thermal fin is placed between some of the adjacent battery cells, so that each battery cell has contact to at least one thermal fin. The thermal fins extend and fold on top of a side edge of the battery cell with 90° angle, so that bent parts of the thermal fins form a substantially planar vertical outer surface. The thermal fins may similarly locate and be bent along the bottom surface. The battery pack includes a foil heater and a thermal pad. A cooling system may include heat exchangers and coolant pipes. A controller and temperature sensor provide thermal management control of the battery pack. The battery pack is used in on-road and off-road electric vehicles.

Abstract: A scalable battery pack includes at least one battery module, a housing around each battery module, and heat exchangers, which are plate-shaped, and which locate on XY-planes of the battery modules. The present scalable battery pack also includes end pieces, which locate on both YZ-planes of each battery module, where the end pieces of adjacent battery modules in the X-direction are connectable, lockable and releasable by connectors. Such a connection can be made manually. The connection in the Y-direction between the battery modules may be made by external fastening pieces attached on the end pieces.

Abstract: A battery module is for various applications requiring a high energy density battery, or where the space for the battery is constrained. The battery module includes one or more rows of battery cells (i.e. pouch cells). Terminal tabs of the cells can be folded 90 degrees on top of a fastening portion, before the terminal tab connections are made mutually and to the fastening portion as well. Fastening portions can be connected together from their ends or replaced by longer elements reaching across several rows of cells. Internal metal layers and compression pads are used between the pouch cells, and the battery module is placed within a metal-made outer housing. The battery module is scalable in its size.

Abstract: The present invention introduces an electrically driven snowmobile, i.e. an electric sled. The electric motor is applied along the primary driving axis so that its rotational force is applied directly or indirectly to the primary driving axis. The electric motor may locate either inside or outside the frame structure of the snowmobile, and either on the left-hand side or the right-hand side of the primary driving axis. One option of manufacturing the electrically driven snowmobile is to convert a traditional combustion engine driven snowmobile into an electrical one by removing some parts and adding the electric motor within the snowmobile. Another option of manufacturing the electrically driven snowmobile is to build a transmission chain from scratch, and by adding an electric motor along the primary driving axis.

Abstract: The present invention introduces an electrically driven snowmobile, i.e. an electric sled. The electric motor is applied along the primary driving axis so that its rotational force is applied directly or indirectly to the primary driving axis. The electric motor may locate either inside or outside the frame structure of the snowmobile, and either on the left-hand side or the right-hand side of the primary driving axis. One option of manufacturing the electrically driven snowmobile is to convert a traditional combustion engine driven snowmobile into an electrical one by removing some parts and adding the electric motor within the snowmobile. Another option of manufacturing the electrically driven snowmobile is to build a transmission chain from scratch, and by adding an electric motor along the primary driving axis.