A battery module, comprising: several cell laminations laminated together along a laminating direction, which comprises at least a first cell lamination and a second cell lamination, each cell lamination (11, 12) comprises multiple cells laminated together and a busbar, each busbar corresponds to and contacts with one of the first cell lamination and the second cell lamination, the busbar comprises a connection portion and a current-flow portion, the connection portion electrically connects and contacts with lugs of the cells, and connects with the current-flow portion, the current-flow portion comprises a first current-flow portion and a second current-flow portion, the first current-flow portion and the second current-flow portion are located at opposite sides of the busbar, and the connection portion is sandwiched between the first current-flow portion and the second current-flow portion; lug-holes mounted in the connection portion, the lugs of the cells electrically connect and contact with the connection portion through the lug-holes; and one conductive plate located beside the cell laminations, a first end of the conductive plate at least electrically connects and contacts with the current-flow portion of the busbar in the first cell lamination, and a second end of the conductive plate at least electrically connects and contacts with the current-flow portion of the busbar in the second cell lamination, the first end and the second end thereof are opposite to each other along the laminating directions; the conductive plate comprises a third end and a fourth end opposite to each other and parallel to the laminating direction; the third end of the conductive plate electrically connects and contacts with the first current-flow portion of one busbar corresponding to the first cell lamination and the first current-flow portion of another busbar corresponding to the second cell lamination, and the fourth end of the conductive plate electrically connects and contacts with the second current-flow portion of one busbar corresponding to the first cell lamination and the second current-flow portion of another busbar corresponding to the second cell lamination. several cell laminations laminated together along a laminating direction, which comprises at least a first cell lamination and a second cell lamination, each cell lamination (11, 12) comprises multiple cells laminated together and a busbar, each busbar corresponds to and contacts with one of the first cell lamination and the second cell lamination, the busbar comprises a connection portion and a current-flow portion, the connection portion electrically connects and contacts with lugs of the cells, and connects with the current-flow portion, the current-flow portion comprises a first current-flow portion and a second current-flow portion, the first current-flow portion and the second current-flow portion are located at opposite sides of the busbar, and the connection portion is sandwiched between the first current-flow portion and the second current-flow portion; lug-holes mounted in the connection portion, the lugs of the cells electrically connect and contact with the connection portion through the lug-holes; and one conductive plate located beside the cell laminations, a first end of the conductive plate at least electrically connects and contacts with the current-flow portion of the busbar in the first cell lamination, and a second end of the conductive plate at least electrically connects and contacts with the current-flow portion of the busbar in the second cell lamination, the first end and the second end thereof are opposite to each other along the laminating directions; the conductive plate comprises a third end and a fourth end opposite to each other and parallel to the laminating direction; the third end of the conductive plate electrically connects and contacts with the first current-flow portion of one busbar corresponding to the first cell lamination and the first current-flow portion of another busbar corresponding to the second cell lamination, and the fourth end of the conductive plate electrically connects and contacts with the second current-flow portion of one busbar corresponding to the first cell lamination and the second current-flow portion of another busbar corresponding to the second cell lamination.