NOVELTY - An electrical connection unit comprises outer circumferential contact part contacting anode of battery cell located below connection unit (i.e. lower battery cell) along outer circumferential region of anode of lower battery cell, and central contact part contacting cathode of battery cell located above connection unit (i.e. upper battery cell) or central region of sidewall of battery pack for providing elastic contact force to entire connection unit mounted between anode and cathode of respective battery cells or between anode and cathode of battery cells and sidewall of battery pack.    USE - An electrical connection unit is used for secondary batteries to achieve electrical connection in battery pack including greater than or equal to 2 cylindrical secondary batteries in physical contact manner, for laptop computer (claimed). The secondary battery pack can also be used in portable DVD players, small-sized personal computers, electric vehicles and hybrid electric vehicles.    ADVANTAGE - The connection unit is capable of stably achieving electrical connection between greater than or equal to 2 secondary battery cells without performing soldering or welding process which requires complicated working process; is constructed in specific structure in which electrical connection is possible and assembly process is easily performed; is freely attached and detached as needed; does not cause the increase in size of battery pack; and is capable of stably maintaining connection between battery cells even when in use for a long period of time and securing safety of batteries against external force.    DETAILED DESCRIPTION - An electrical connection unit comprises outer circumferential contact part contacting anode of battery cell located below connection unit (i.e. lower battery cell) along outer circumferential region of anode of lower battery cell, and central contact part contacting cathode of battery cell located above connection unit (i.e. upper battery cell) or central region of sidewall of battery pack for providing elastic contact force to entire connection unit mounted between anode and cathode of respective battery cells or between anode and cathode of battery cells and sidewall of battery pack. The outer circumferential contact part can be electrically connected to anode of lower battery cell in surface contact manner, for minimizing change of resistance at contact region against external force and restraining possibility that anode is depressed.    DESCRIPTION OF DRAWING(S) - The drawing shows an x-ray fluoroscopic view illustrating change of battery pack constructed in structure where cathode and anode terminals are electrically connected to each other by connection unit in physical contact manner after dropping battery pack.