Battery pack with high structural reliability

A battery pack comprising:

• (a) a battery module array having battery modules arranged in two or more rows, each of the battery modules having a structure in which battery cells or unit modules, each having two or more battery cells mounted therein, are stacked in a state in which the battery cells or the unit modules are erected in an upside-down fashion;
• (b) a pair of side support members (a front support member and a rear support member) that support the front and rear of the battery module array, respectively, in a state in which the pair of side support members are in close contact with outermost unit modules in the battery modules in the battery module array;
• (c) lower end support members coupled to lower ends of the side support members to support a lower end of the battery module array;
• (d) two or more first upper mounting members coupled to upper ends of the side support members and lower ends of the battery modules erected in an upside-down fashion, each of the first upper mounting members being fastened at one end thereof to an external device and having the shape of an angular pipe that is angular in vertical section;
• (e) a second upper mounting member coupled to upper ends of the first upper mounting members such that the second upper mounting member intersects the first upper mounting members at right angles, the second upper mounting member being fastened at opposite ends thereof to the external device and having the shape of an angular pipe that is angular in vertical section;
• and
• (f) a rear mounting member disposed at the rear of the battery module array, the rear mounting member being fastened at opposite ends thereof to the external device and having the shape of an angular pipe that is angular in vertical section.