A lithium-ion battery module (22, 322, 522) comprising: - a housing (26, 326, 326A, 426A, 426B, 426C, 826, 926) having a plurality of compartments (29, 829, 929) within the housing (26, 326, 326A, 426A, 426B, 426C, 826, 926); - a plurality of lithium-ion cell elements (24, 524, 624, 724, 824, 924) having a top side and a bottom side disposed opposite to the top side, one of the lithium-ion cell elements (24, 524, 624, 724, 824, 924) being provided in each of the compartments (29, 829, 929) of the housing (26, 326, 326A, 426A, 426B, 426C, 826, 926); and - a cover (30, 830, 930) coupled to the housing (26, 326, 326A, 426A, 426B, 426C, 826, 926), wherein the cover (30, 830, 930) is configured to seal the compartments (29, 829, 929) of the housing (26, 326, 326A, 426A, 426B, 426C, 826, 926) from each other; characterized in that the lithium-ion battery module (22, 322, 522) further comprises: - a permeability barrier (38, 836, 838) configured to block water from reaching the plurality of lithium-ion cell elements (24, 524, 624, 724, 824, 924), wherein the permeability barrier (38, 836, 838) comprises a plurality of metal foil pouches (25, 825), wherein each metal foil pouch (25, 825) is disposed about a respective lithium-ion cell element (24, 524, 624, 724, 824, 924), and wherein: - each metal foil pouch (25, 825) is open on the top side of the respective lithium-ion cell element (24, 524, 624, 724, 824, 924) and closed on the bottom side of the respective lithium-ion cell element (24, 524, 624, 724, 824, 924); and - each metal foil pouch (25, 825) preferably acts as a terminal of the respective lithium-ion cell element (24, 524, 624, 724, 824, 924), wherein the cover (30, 830, 930) is configured to route electrolyte into each of the compartments (29, 829, 929), and the open end of each metal foil pouch (25, 825) is configured to receive the electrolyte routed into the corresponding compartment (29, 829, 929). - a housing (26, 326, 326A, 426A, 426B, 426C, 826, 926) having a plurality of compartments (29, 829, 929) within the housing (26, 326, 326A, 426A, 426B, 426C, 826, 926); - a plurality of lithium-ion cell elements (24, 524, 624, 724, 824, 924) having a top side and a bottom side disposed opposite to the top side, one of the lithium-ion cell elements (24, 524, 624, 724, 824, 924) being provided in each of the compartments (29, 829, 929) of the housing (26, 326, 326A, 426A, 426B, 426C, 826, 926); and - a cover (30, 830, 930) coupled to the housing (26, 326, 326A, 426A, 426B, 426C, 826, 926), wherein the cover (30, 830, 930) is configured to seal the compartments (29, 829, 929) of the housing (26, 326, 326A, 426A, 426B, 426C, 826, 926) from each other; - a permeability barrier (38, 836, 838) configured to block water from reaching the plurality of lithium-ion cell elements (24, 524, 624, 724, 824, 924), wherein the permeability barrier (38, 836, 838) comprises a plurality of metal foil pouches (25, 825), wherein each metal foil pouch (25, 825) is disposed about a respective lithium-ion cell element (24, 524, 624, 724, 824, 924), and wherein: - each metal foil pouch (25, 825) is open on the top side of the respective lithium-ion cell element (24, 524, 624, 724, 824, 924) and closed on the bottom side of the respective lithium-ion cell element (24, 524, 624, 724, 824, 924); and - each metal foil pouch (25, 825) preferably acts as a terminal of the respective lithium-ion cell element (24, 524, 624, 724, 824, 924), - each metal foil pouch (25, 825) is open on the top side of the respective lithium-ion cell element (24, 524, 624, 724, 824, 924) and closed on the bottom side of the respective lithium-ion cell element (24, 524, 624, 724, 824, 924); and - each metal foil pouch (25, 825) preferably acts as a terminal of the respective lithium-ion cell element (24, 524, 624, 724, 824, 924),