Battery pack and method for assembling a battery pack

A battery pack, comprising:

• at least two battery cells (11), wherein each battery cell (11) has an electrically positive and an electrically negative connection contact (33, 34), which are arranged on opposite sides of the battery cell (11),
• wherein all electrically positive connection contacts (33) of the at least two battery cells (11) are connected to a first connection structure (14), and all electrically negative connection contacts (34) of the at least two battery cells (11) are connected to a second connection structure (14),
• wherein the first connection structure (14) has a positive potential and represents a positive connection terminal of the battery pack and the second connection structure (14) has a negative potential and represents a negative connection terminal of the battery pack;
• wherein the first connection structure (14) and the second connection structure (14) have a similar flat shape and are arranged on opposite sides of the battery pack (10), and each of the first and second connection structures (14) is formed to have a flat surface so as to allow a uniform current distribution to all connected battery cells (11) and has a current capacity corresponding to the sum of the individual currents of each connected battery cell (11),
• wherein each electrically positive connection contact (33) of the at least two battery cells (11) is connected to the first connection structure (14) via at least one connection element (15, 51) and
• wherein each electrically negative connection contact (34) of the at least two battery cells (11) is connected to the second connection structure (14) via at least one further connection element (15, 51),
• wherein the connection elements (15, 51) have a flat strip shape and a cross section of the respective connection element (15, 51) is dimensioned to support a predetermined maximum current of one battery cell (11);
• wherein the connection elements (15, 51) are connected to a side of the first and second connection structure (14) correspondingly facing the battery cells (11),
• wherein an electrically non-conducting first support structure (12) is arranged on the side of the positive electrical connection contacts (33), and an electrically non-conducting second support structure (13) is arranged on the side of the negative electrical connection contacts (34), wherein the first support structure (12) and the second support structure (13) are formed in a similar shape and respectively comprise receiving openings (21) for respectively receiving opposite end portions of the outer shape of each battery cell (11) of the battery pack,
• wherein outer dimensions of said first and second connection structures (14) substantially corresponds to outer dimensions of the first and second support structures (12, 13),
• wherein the first connection structure (14) covers the first support structure (12) and the second connection structure (14) covers the second support structure (13) such that the first and second connection structures (14) constitute outermost opposing surfaces of the battery pack, without any parts protruding perpendicular to said opposing surfaces,
• wherein the first and second connection structures (14) each comprise connecting pads (52) for respective attachment of the flat strip shaped connection elements (15, 51), each of the connecting pads (52) being dimensioned to correspond to at least a square area of a width of the flat strip shape of the connection element (15, 51) associated therewith,
• wherein the first connection structure (14) includes a first connection region (17) defining the positive connection terminal at an upper side of the battery pack (10) and the second connection structure (14) includes a second connection region (18) defining the negative connection terminal at an opposing lower side of the battery pack (10), the first and second connection regions (17, 18) being diagonally opposed relative to each other such that the first connection region (17) is located on a left side of the first connection structure (14) at the upper side of the battery pack (10) and the second connection region (18) is located on an opposing right side of the second connection structure (14) at the opposing lower side of the battery pack (10).