Terminal connecting device for energy storage module

1. A terminal connecting device for an energy storage module to connect a plurality of cells for a high voltage capacitor or battery assembly, the device comprising:

a busbar having a body portion formed of a plate having a predetermined length stepped at both ends, and a cell terminal mounting portion having an insert hole at each end of the body portion into which a corresponding cell terminal is inserted; and

a fastening member to secure the busbar by a screw connection with the cell terminal through the insert hole at each end of the body portion of the busbar, the fastening member having a nut body portion formed of a plate having a hollow at the center and the outer periphery processed in the shape of a nut, and a nut screw portion having a screw thread formed along the inner periphery of the hollow of the nut body portion for screw connection with the cell terminal,

wherein the height of the step of the body portion of the busbar is equal to the height of the nut body portion of the fastening member.

2. The terminal connecting device for an energy storage module according to claim 1 ,

wherein the fastening member further includes a circular protrusion having a cylindrical shape protruding downward from the nut body portion along the hollow.

3. The terminal connecting device for an energy storage module according to claim 2 ,

wherein the circular protrusion has an outer diameter corresponding to the diameter of the insert hole of the body portion of the busbar.

4. The terminal connecting device for an energy storage module according to claim 2 ,

wherein the circular protrusion has an outer diameter smaller than the diameter of the insert hole of the body portion of the busbar.

5. The terminal connecting device for an energy storage module according to claim 2 ,

wherein the circular protrusion has a protruding length smaller than the height of the body portion of the busbar.

6. The terminal connecting device for an energy storage module according to claim 1 ,

wherein the body portion of the busbar is stepped over the length including the cell terminal mounting portions at both ends thereof.

7. The terminal connecting device for an energy storage module according to claim 6 ,

wherein the body portion of the busbar is stepped at boundaries in the shape of a semicircle.

8. The terminal connecting device for an energy storage module according to claim 1 ,

wherein the body portion of the busbar has a bent portion at the lower surface in the middle thereof to avoid the interference with a sleeve provided to provide insulation between the cells.

9. The terminal connecting device for an energy storage module according to claim 1 ,

wherein the body portion of the busbar has a hole to receive a voltage measuring terminal of a balancing circuit for protecting the cells.

10. The terminal connecting device for an energy storage module according to claim 1 ,

wherein the nut body portion is shaped of a standard nut corresponding to a standard fastening tool.

11. A terminal connecting device for an energy storage module to connect a plurality of cells for a high voltage capacitor or battery assembly, the device comprising:

a busbar having a body portion formed of a plate with a predetermined length, and a cell terminal coupling portion having an insert hole at each end of the body portion into which a corresponding cell terminal is inserted, the insert hole at one end of the body portion having a screw thread along the inner periphery; and

a fastening member formed of a circular plate having a hollow to secure the busbar by screw connection with the cell terminal through the insert hole at the other end of the body portion of the busbar.

12. The terminal connecting device for an energy storage module according to claim 11 ,

wherein the body portion of the busbar is stepped such that the other end has a smaller thickness than one end.

13. The terminal connecting device for an energy storage module according to claim 11 ,

wherein the body portion of the busbar has a stopper corresponding to a cell terminal post of the cell terminal at the other end.

14. The terminal connecting device for an energy storage module according to claim 11 ,

wherein the body portion of the busbar has a step portion at the lower surface between one end and the other end to avoid the interference with a sleeve provided for insulation of the cells.

15. The terminal connecting device for an energy storage module according to claim 11 ,

wherein the body portion of the busbar has a hole at the side to receive a voltage measuring terminal of a balancing circuit for protecting the cells.

16. The terminal connecting device for an energy storage module according to claim 11 ,

wherein the fastening member is stepped such that portions have different diameters.

17. The terminal connecting device for an energy storage module according to claim 16 ,

wherein the fastening member has a lower portion, where the cell terminal is coupled, having a smaller diameter than an upper portion.

18. The terminal connecting device for an energy storage module according to claim 11 ,

wherein the fastening member has a screw thread along the inner periphery of the hollow to establish a screw connection with the cell terminal.

19. The terminal connecting device for an energy storage module according to claim 11 ,

wherein the fastening member has a groove into a fastening tool is inserted.