Battery pack including battery cells connected to a printed circuit board substrate via first and second electrode tabs

1. A battery pack comprising:

a plurality of battery cells;

a printed circuit board (PCB) substrate electrically connected to the plurality of battery cells and comprising first and second surfaces opposite each other; and

first and second electrode tabs electrically connecting a respective battery cell of the plurality of battery cells to the PCB substrate, the first and second electrode tabs being respectively connected to conductive pads having different polarities and located on the first surface of the PCB substrate,

wherein the first and second electrode tabs respectively comprise:

first and second coupling portions respectively coupled to first and second electrodes of the respective battery cell;

first and second conductive portions extending from the first and second coupling portions toward the PCB substrate and respectively connected to the conductive pads having different polarities; and

first and second fixing portions extending from the first and second coupling portions and respectively coupled to different isolated pads of the PCB substrate.

2. The battery pack of claim 1 , wherein the conductive pads form portions of conductive patterns of the PCB substrate forming a charge-discharge current path of the respective battery cell.

3. The battery pack of claim 2 , wherein the conductive patterns of the PCB substrate comprise the conductive pads located on the first surface, a conductive section located on the second surface, and vias penetrating the PCB substrate to connect at least one of the conductive pads on the first surface to the conductive section on the second surface.

4. The battery pack of claim 3 , wherein the PCB substrate comprises a rigid insulative substrate supporting the conductive patterns located on the first and second surfaces.

5. The battery pack of claim 1 , wherein the isolated pads are located on the first surface of the PCB substrate.

6. The battery pack of claim 5 , wherein the isolated pads do not form a charge-discharge current path of the respective battery cell.

7. The battery pack of claim 5 , wherein the first conductive portion and the first fixing portion radially extend from mutually-facing positions of the first coupling portion toward the PCB substrate.

8. The battery pack of claim 7 , wherein the first conductive portion and the first fixing portion extend from opposite positions of the first coupling portion and extend toward the PCB substrate in opposite directions.

9. The battery pack of claim 5 , wherein the first electrode tab further comprises a deformation portion comprising one or more bent portions on at least one of the first conductive portion and the first fixing portion.

10. The battery pack of claim 5 , wherein the first conductive portion and the first fixing portion extend to and are coupled to the first surface of the PCB substrate through an opening of the PCB substrate through which the first and second electrodes of the respective battery cell are exposed.

11. The battery pack of claim 5 , wherein the second conductive portion and the second fixing portion extend from mutually-facing positions of the second coupling portion toward the PCB substrate.

12. The battery pack of claim 5 , wherein the second electrode tab further comprises a third fixing portion extending from the second coupling portion and coupled to the first surface of the PCB substrate, the third fixing portion being between the second conductive portion and the second fixing portion.

13. The battery pack of claim 12 , wherein an additional isolated pad is located on the first surface of the PCB substrate between the conductive pad to which the second conductive portion is connected and the isolated pad to which the second fixing portion is coupled, and

the third fixing portion is coupled to the additional isolated pad of the PCB substrate.

14. The battery pack of claim 13 , wherein the additional isolated pad does not form a charge-discharge current path of the respective battery cell.

15. The battery pack of claim 12 , wherein the second conductive portion, the second fixing portion, and the third fixing portion extend from different positions of the second coupling portion toward the PCB substrate.

16. The battery pack of claim 12 , wherein the second electrode tab further comprises a deformation portion comprising one or more bent portions on at least one of the second conductive portion, the second fixing portion, and the third fixing portion.

17. The battery pack of claim 12 , wherein the second conductive portion, the second fixing portion, and the third fixing portion extend to and are coupled to the first surface of the PCB substrate through an opening of the PCB substrate through which the first and second electrodes of the respective battery cell are exposed.

18. The battery pack of claim 1 , wherein the first surface of the first and second surfaces of the PCB substrate which are opposite each other in a thickness direction of the PCB substrate is more distant relative to the second surface from upper end portions of the battery cells on which first and second electrodes are located.

19. The battery pack of claim 1 , wherein the battery cells comprise upper and lower end portions opposite each other,

the PCB substrate faces the upper end portions of the battery cells on which first and second electrodes are located, and

the battery pack further comprises a cooling member at a position facing the lower end portions of the battery cells.