A current collector system (5, 15, 25, 35) for a battery module (4, 10, 20, 30) comprising a plurality of battery cells, the current collector system (5, 15, 25a, 25b, 35a, 35b) comprising: a first current collector plate (3a, 13a, 23a, 33a) and a second current collector plate (3b, 13b, 23b, 33b) stacked on each other and thermally insulated from each other; wherein the first current collector plate (3a, 13a, 23a, 33a) comprises a plurality of first connection sites (17a, 17a', 27a, 37a) connectable to a first group (1a, 11a, 21a, 31a) of battery cells of the battery module (4, 10, 20, 30) and the second current collector plate (3b, 13b, 23b, 33b) comprises a plurality of second connection sites (17b, 17b', 27b, 37b) connectable to a second group (1b, 11b, 21b, 31b) of battery cells of the battery module (4, 10, 20, 30), and characterized in that the second current collector plate (3b, 13b) comprises a plurality of perforations corresponding to the first connection sites (17a, 17a') of the first current collector plate (3a, 13a) for exposing the first connection sites (17a, 17a'), wherein the second connection sites (17b, 17b', 27b, 37b) are away from the plurality of perforations, and a first thermal insulating layer made of thermally insulating material is provided between the first current collector plate (3a, 13a) and the second current collector plate (3b, 13b) the first thermal insulating layer being provided with the same perforations as the second current collector plate wherein a minimum distance (S, S') between two first connection sites (17a, 17a', 27a, 37a) in the first current collector plate (3a, 13a, 23a, 33a) and between two second connection sites (17b, 17b', 27b, 37b) in the second current collector plate (3b, 13b,23b, 33b) is greater than the distance between two adjacent connection sites of the current collector system (5, 15, 25a, 25b, 35a, 35b). a first current collector plate (3a, 13a, 23a, 33a) and a second current collector plate (3b, 13b, 23b, 33b) stacked on each other and thermally insulated from each other; wherein the first current collector plate (3a, 13a, 23a, 33a) comprises a plurality of first connection sites (17a, 17a', 27a, 37a) connectable to a first group (1a, 11a, 21a, 31a) of battery cells of the battery module (4, 10, 20, 30) and the second current collector plate (3b, 13b, 23b, 33b) comprises a plurality of second connection sites (17b, 17b', 27b, 37b) connectable to a second group (1b, 11b, 21b, 31b) of battery cells of the battery module (4, 10, 20, 30), and characterized in that the second current collector plate (3b, 13b) comprises a plurality of perforations corresponding to the first connection sites (17a, 17a') of the first current collector plate (3a, 13a) for exposing the first connection sites (17a, 17a'), wherein the second connection sites (17b, 17b', 27b, 37b) are away from the plurality of perforations, and a first thermal insulating layer made of thermally insulating material is provided between the first current collector plate (3a, 13a) and the second current collector plate (3b, 13b) the first thermal insulating layer being provided with the same perforations as the second current collector plate wherein a minimum distance (S, S') between two first connection sites (17a, 17a', 27a, 37a) in the first current collector plate (3a, 13a, 23a, 33a) and between two second connection sites (17b, 17b', 27b, 37b) in the second current collector plate (3b, 13b,23b, 33b) is greater than the distance between two adjacent connection sites of the current collector system (5, 15, 25a, 25b, 35a, 35b).