An endplate arrangement for a battery module (100; 415A; 420A; 425A; 430A) configured for insertion into a battery module compartment of an energy storage system, comprising: an endplate configured to secure the battery module inside the energy storage system as a wall of the battery module compartment; a cooling tube (715A; 810B) including a cooling tube inlet (810A; 815A) and a cooling tube outlet (810A; 815A) that extend outside the battery module via first and second holes, respectively, in the endplate, the cooling tube configured to receive liquid coolant via a first cooling interface (300D; 305D; 310D; 315D; 320D; 325D) of a cooling manifold (340C, 345C, 405A, 410A) coupled to the cooling tube inlet and to output the liquid coolant via a second cooling interface (330D; 335D; 340D; 345D; 350D; 355D) of the cooling manifold coupled to the cooling tube outlet; characterized by: a first sealing component arranged around the cooling tube inside a given hole among the first and second holes so as to seal the battery module compartment, the first sealing component defining a first sealing area between the first sealing component and the cooling tube in the given hole and a second sealing area between the first sealing component and the endplate in the given hole, wherein the first and second sealing areas are arranged as ring-shaped gaps around the cooling tube and the first sealing component, respectively, inside the given hole; a first sealing element arranged in the first sealing area; and a second sealing element arranged in the second sealing area. an endplate configured to secure the battery module inside the energy storage system as a wall of the battery module compartment; a cooling tube (715A; 810B) including a cooling tube inlet (810A; 815A) and a cooling tube outlet (810A; 815A) that extend outside the battery module via first and second holes, respectively, in the endplate, the cooling tube configured to receive liquid coolant via a first cooling interface (300D; 305D; 310D; 315D; 320D; 325D) of a cooling manifold (340C, 345C, 405A, 410A) coupled to the cooling tube inlet and to output the liquid coolant via a second cooling interface (330D; 335D; 340D; 345D; 350D; 355D) of the cooling manifold coupled to the cooling tube outlet; characterized by: a first sealing component arranged around the cooling tube inside a given hole among the first and second holes so as to seal the battery module compartment, the first sealing component defining a first sealing area between the first sealing component and the cooling tube in the given hole and a second sealing area between the first sealing component and the endplate in the given hole, wherein the first and second sealing areas are arranged as ring-shaped gaps around the cooling tube and the first sealing component, respectively, inside the given hole; a first sealing element arranged in the first sealing area; and a second sealing element arranged in the second sealing area. a first sealing component arranged around the cooling tube inside a given hole among the first and second holes so as to seal the battery module compartment, the first sealing component defining a first sealing area between the first sealing component and the cooling tube in the given hole and a second sealing area between the first sealing component and the endplate in the given hole, wherein the first and second sealing areas are arranged as ring-shaped gaps around the cooling tube and the first sealing component, respectively, inside the given hole; a first sealing element arranged in the first sealing area; and a second sealing element arranged in the second sealing area.