Cooling circuit with cooling fluid for lithium batteries, and a vehicle comprising said cooling circuit

A cooling circuit with cooling fluid for lithium ion batteries comprising:

• a battery pack comprising a plurality of cells electrically connected to each other, suitable for powering an electric machine for traction,
• said cells being perimetrally delimited by outer walls,
• at least one bag containing cooling fluid associated with contact with said outer walls of the cells,
• wherein said at least one bag is made of electrically insulating and deformable material so as to be counter-shaped to said outer walls to adhere perimetrally to said outer walls,
• forced circulation means of the cooling fluid through said at least one bag,
• wherein between the cells adjacent to each other spacers are arranged which have the function of creating abutments for the packing of the cells composing the battery pack, wherein the bag interposed between adjacent cells has a thickness/shape less than that of an interspace between the adjacent cells, so that is not compressed between adjacent cells.