We claim the ornamental design for a battery module, as shown and described.
FIG. 1 is a front elevational view of a battery module showing the present design;
FIG. 2 is a top plan view thereof;
FIG. 3 is a bottom plan view thereof;
FIG. 4 is a right side elevational view thereof;
FIG. 5 is a left side elevational view thereof;
FIG. 6 is a perspective view thereof;
FIG. 7 is an enlarged right side elevational view thereof;
FIG. 8 is an enlarged left side elevational view thereof;
FIG. 9 is a is a front elevational view of the battery module covered with outer transparency film;
FIG. 10 is a top plan view of the battery module covered with outer transparency film; and,
FIG. 11 is a bottom plan view of the battery module covered with outer transparency film.
Note that a rear elevational view is omitted since it is symmetrical to a front elevational view. The present application is indicated to a battery module which is covered its periphery with outer transparency film. Note that hatching in FIGS. 9-11 indicates the outer transparency film.