Lead member and secondary battery module with the same

1. A secondary battery module, which comprises:

at least two cells stacked to a predetermined height;

at least one lead member at least partially bent to connect adjacent cells and form a single series circuit through electrode terminals of the cells and detachably connected with corresponding electrode terminals of the adjacent cells; and

at least one insulating mediator having a hole for guiding the bent portion of the lead member and cylindrical bosses at positions where at least two fasteners penetrate in order to prevent a short circuit caused by the lead member and the fasteners,

wherein each insulating mediator has cut portions and alignment projections at one end, while having interfitting recesses and interfitting projections at the other end, respectively on the bottom and top portions thereof in order to stack up and fix the plurality of cells to a predetermined height.

2. The secondary battery module as claimed in claim 1 , further comprising two auxiliary terminals disposed respectively on one electrode terminal of a top cell and on one electrode terminal of a bottom cell to be connected to corresponding electrode terminals of the two outmost cells.

3. The secondary battery module as claimed in claim 2 , further comprising two insulating supports for covering corresponding electrode terminals of the two outmost cells of the cells and having a shape that partially exposes corresponding auxiliary terminals.

4. The secondary battery module as claimed in claim 3 , wherein the two fasteners insulatedly fasten the insulating supports, the lead member, the insulating mediator, the electrode terminals and the auxiliary terminals together.

5. The secondary battery module as claimed in claim 1 , wherein each lead member has safety device peripheries bent at a predetermined angle with respect to the axial line of the lead member and the hole formed on the corresponding insulating mediator has a sloping surface forming a predetermined angle with respect to the axial line of the insulating mediator.

6. The secondary battery module as claimed in claim 1 , wherein at least one of the cylindrical bosses has a plurality of ribs formed in an outward radial direction so that heat transferred through the electrode terminals of the cells can be smoothly released out.

7. The secondary battery module as claimed in claim 3 , wherein each insulating support has cylindrical bosses at positions where the fasteners penetrate in order to prevent an accidental short circuit caused by the electrode terminals, auxiliary terminals and fasteners.

8. The secondary battery module as claimed in claim 3 , wherein each insulating support has an opening cut in a longitudinal direction at least one end thereof.

9. The secondary battery module as claimed in claim 4 , wherein said fasteners consist of pairs of bolts and nuts.

10. The secondary battery module as claimed in claim 1 , wherein said insulating mediators are made of at least one material selected from a group consisting of PBT (polybutylene terephthalate), ABS (acrylonitrile-butadiene-styrene) and PC (polycarbonate) resin.

11. The secondary battery module as claimed in claim 3 , wherein said insulating supports are made of at least one material selected from a group consisting of PBT (polybutylene terephthalate), ABS (acrylonitrile-butadiene-styrene) and PC (polycarbonate) resin.

12. The secondary battery module as claimed in claim 1 , wherein each cell includes a cell protection circuit for electrical protection from overcurrent, overcharge or overdischarge conditions.

13. The secondary battery module as claimed in claim 1 , wherein said lead member has a safety device on at least one portion thereof.

14. The secondary battery module as claimed in claim 13 , wherein said safety device is a PTC (Positive Temperature Coefficient) device.

15. The secondary battery module as claimed in claim 1 , wherein said lead member is made of at least one material selected from a group consisting of copper, aluminum, nickel-copper and copper-aluminum.

16. The secondary battery module as claimed in claim 13 , wherein said lead member is made of at least one material selected from a group consisting of copper, aluminum, nickel-copper and copper-aluminum.

17. The secondary battery module as claimed in claim 14 , wherein said lead member is made of at least one material selected from a group consisting of copper, aluminum, nickel-copper and copper-aluminum.