The ornamental design for a bipolarelectrode, as shown and described.
FIG. 1 is a top perspective view of a bipolar electrode in accordance with the new design;
FIG. 2 is a top plan view thereof;
FIG. 3 is a bottom plan view thereof;
FIG. 4 is a right side perspective view thereof, the left side perspective view being a mirror image thereof;
FIG. 5 is a rear perspective view thereof; and,
FIG. 6 is a front perspective view thereof.
The broken lines immediately adjacent to the claimed areas in the views represent the boundaries of the design. The broken lines showing portions of a bipolar electrode are included for the purpose of illustrating environmental structure and form no part of the claimed design. None of the broken lines form any part of the claimed design.