A lithium-ion battery module, comprising: - a housing (26, 326, 826, 926) having external walls and a plurality of electrically insulative internal partitions (28, 328, 828, 928) defining a plurality of compartments (29, 829, 929); - a plurality of cylindrical lithium-ion cell elements (24, 824) corresponding in number to the plurality of compartments (29, 829, 929) and disposed within the plurality of compartments (29, 829, 929), wherein each compartment (29, 829, 929) of the plurality of compartments (29, 829, 929) is configured to receive one cylindrical lithium-ion cell element (24, 824) of the plurality of cylindrical lithium-ion cell elements (24, 824) and to receive electrolyte, and wherein connectors are provided above the plurality of cylindrical lithium-ion battery cell elements (24, 824) to electrically couple each of the plurality of cylindrical lithium-ion battery cell elements (24, 824) to one or more other of the plurality of cylindrical lithium-ion cell elements (24, 824); and - an electrically insulative cover (830, 930) configured to be coupled to the housing (26, 326, 826, 926), to route electrolyte into each of the compartments (29, 829, 929) and to seal the compartments (29, 829, 929) of the housing (26, 326, 826, 926) from each other, wherein the electrically insulative cover (830, 930) includes recesses to accommodate the connectors, characterized in that the housing (26, 326, 826, 926) is an electrically insulative housing, the plurality of electrically insulative internal partitions (28, 328, 828, 928) do not extend to the top of the electrically insulative housing (26, 326, 826, 926), and the electrically insulative cover (830, 930) further comprises a plurality of additional recesses (833, 933), each additional recess (833, 933) configured to distribute electrolyte to a corresponding one of the plurality of compartments (829, 929) through an opening (834, 934) disposed in each additional recess (833, 933) of the plurality of additional recesses (833, 933). - a housing (26, 326, 826, 926) having external walls and a plurality of electrically insulative internal partitions (28, 328, 828, 928) defining a plurality of compartments (29, 829, 929); - a plurality of cylindrical lithium-ion cell elements (24, 824) corresponding in number to the plurality of compartments (29, 829, 929) and disposed within the plurality of compartments (29, 829, 929), wherein each compartment (29, 829, 929) of the plurality of compartments (29, 829, 929) is configured to receive one cylindrical lithium-ion cell element (24, 824) of the plurality of cylindrical lithium-ion cell elements (24, 824) and to receive electrolyte, and wherein connectors are provided above the plurality of cylindrical lithium-ion battery cell elements (24, 824) to electrically couple each of the plurality of cylindrical lithium-ion battery cell elements (24, 824) to one or more other of the plurality of cylindrical lithium-ion cell elements (24, 824); and - an electrically insulative cover (830, 930) configured to be coupled to the housing (26, 326, 826, 926), to route electrolyte into each of the compartments (29, 829, 929) and to seal the compartments (29, 829, 929) of the housing (26, 326, 826, 926) from each other, wherein the electrically insulative cover (830, 930) includes recesses to accommodate the connectors,