Abstract: A battery pack includes a first housing, a second housing, a cell module, and a plurality of connecting components. The first housing includes a first top wall. The second housing is accommodated in the first housing and connected to the first housing. The second housing and the first top wall are spaced apart along a first direction. The cell module is accommodated in the second housing. The connecting component is connected to the first top wall and the second housing. A structural strength of the connecting component is greater than structural a strength of the second housing.

Abstract: Various embodiments identify some constraints for multiple mask designs of multi-patterning lithography processes for manufacturing an electronic design and colors multiple routing tracks in a layer of the electronic design with certain colors. These embodiments color fixed object(s) in the design with one or more of these certain colors based on coloring of the multiple routing tracks. Some embodiments further color movable object(s) based on results of coloring the fixed object(s) or coloring routing track(s). Some embodiments route the physical design with coloring of fixed object(s), coloring of movable object(s), or routing connectivity. Multiple-patterning conflicts may be detected based on the coloring of fixed object(s), coloring of movable object(s), or routing connectivity. Some embodiments route with search-and-repair strategy(ies) to improve or resolve conflict(s). Some embodiments color objects upon their creation, and the layout is thus multiple-patterning design rule clean as constructed.