Temperature-control device for a battery system

A temperature control device for a battery system, said temperature-control device comprising:

• a cuboid-shaped hollow body having a liquid space therein with at least one connection device configured to supply a separately temperature-controlled fluid to the liquid space and at least one connection device configured to discharge the separately temperature-controlled fluid,
• the body having therein a plurality of regularly arranged and identically formed openings extending from a first body surface to a second body surface,
• wherein each opening accommodates therein a respective cylindrical battery cell in a fluid-tight connection so that the fluid space in the hollow body is fluid-tight, and
• wherein the hollow body, excluding the cell head and the cell bottom, extends over a height h of >20 to <100% of the total height H of the battery system.