Abstract: A battery pack for an electric bicycle is disclosed. In one embodiment, the battery pack includes i) a lower case having a top, a bottom and an interior space formed between the top and bottom and ii) a battery cell placed in the interior space of the lower case, wherein the battery cell has first and second surfaces opposing each other, and wherein the first surface of the battery cell is closer to the bottom of the lower case than the second surface of the battery cell. The battery pack may further include i) a protection circuit board mounted on the second surface of the battery cell and placed in the interior space of the lower case, ii) an upper case formed over the top of the lower case and iii) a separator case formed between the protection circuit board and the upper case.

Abstract: A power supply apparatus for an electric bicycle is disclosed. The apparatus may include i) a battery pack and ii) a keybox connected to the battery pack and controlling on/off operations of the power supply apparatus. The keybox may further include i) a key set configured to receive a key cylinder that is moveable according to the rotation of a key inserted into the key box, ii) a contact terminal that includes a first plurality of sub-terminals, iii) a terminal base including at least one second sub-terminal connectable to and detachable from at least one of the first sub-terminals and iv) a keybox case configured to receive the key set, the contact terminal, and the terminal base. The terminal base may have a plate shape with a polygonal periphery surface at least part of which contacts an inner portion of the keybox case.

Abstract: A power supply apparatus for an electric bicycle is disclosed. The apparatus may include i) a battery pack and ii) a keybox connected to the battery pack and controlling on/off operations of the power supply apparatus. The keybox may further include i) a key set configured to receive a key cylinder that is moveable according to the rotation of a key inserted into the key box, ii) a contact terminal that includes a first plurality of sub-terminals, iii) a terminal base including at least one second sub-terminal connectable to and detachable from at least one of the first sub-terminals and iv) a keybox case configured to receive the key set, the contact terminal, and the terminal base. The terminal base may have a plate shape with a polygonal periphery surface at least part of which contacts an inner portion of the keybox case.

Abstract: A battery pack for an electric bicycle is disclosed. In one embodiment, the battery pack includes i) a lower case having a top, a bottom and an interior space formed between the top and bottom and ii) a battery cell placed in the interior space of the lower case, wherein the battery cell has first and second surfaces opposing each other, and wherein the first surface of the battery cell is closer to the bottom of the lower case than the second surface of the battery cell. The battery pack may further include i) a protection circuit board mounted on the second surface of the battery cell and placed in the interior space of the lower case, ii) an upper case formed over the top of the lower case and iii) a separator case formed between the protection circuit board and the upper case.