Battery pack

1. A battery pack, comprising:

a battery cell;

a temperature sensor configured to measure the temperature of the battery cell; and

an inner cover substantially covering the battery cell,

wherein the inner cover comprises a sensor attachment configured to attach the temperature sensor to the battery cell,

wherein the sensor attachment comprises a cover body and a cantilever member,

wherein the cantilever member comprises a fixed end connected to the cover body and an opposite free end not connected to the cover body, the opposite free end being in direct contact with the temperature sensor, and

wherein the sensor attachment comprises a pair of guide walls configured to guide the temperature sensor while the temperature sensor is being attached to the battery cell, wherein the cantilever member is formed between the guide walls and wherein the cantilever member is configured to apply pressure to the temperature sensor.

2. The battery pack of claim 1 , wherein the sensor attachment pushes the temperature sensor against the battery cell.

3. The battery pack of claim 1 , wherein the sensor attachment is configured to receive the temperature sensor such that the temperature sensor pushes up the free end and slides toward the fixed end and wherein the cantilever member is configured to press the temperature sensor against the battery cell by resilience thereof.

4. The battery pack of claim 1 , wherein the cantilever member further comprises a pressure adjusting portion and wherein the distance from the pressure adjusting portion to the battery cell decreases in a direction from the fixed end to the free end.

5. The battery pack of claim 4 , wherein the pressure adjusting portion is sloped downwardly toward the battery cell.

6. The battery pack of claim 1 , wherein the cantilever member further comprises a catch jaw formed on a lower side of the free end and configured to substantially prevent separation of the temperature sensor from the sensor attachment.

7. The battery pack of claim 6 , wherein the sensor attachment is configured to receive the temperature sensor in an assembling direction and wherein the catch jaw has a wedge shape with a slope increasing in the assembling direction.

8. The battery pack of claim 1 , wherein the cantilever member further comprises a stopper formed between the fixed end and the free end so as to define the position of the temperature sensor.

9. The battery pack of claim 1 , wherein the temperature sensor is placed between the guide walls and under the cantilever member.

10. The battery pack of claim 1 , wherein sensor attachment is configured to receive the temperature sensor in an assembling direction and wherein each of the guide walls comprises an assembling position guide portion having a width which decreases in the assembling direction.

11. The battery pack of claim 1 , wherein the battery cell includes a plurality of battery cells, wherein the battery cells are electrically connected to each other through a plurality of bus bars, and wherein the inner cover comprises a bus bar assembling portion defining the positions of the bus bars.

12. The battery pack of claim 11 , wherein the bus bars are located above or below the bus bar assembling portion.

13. The battery pack of claim 11 , wherein the bus bar assembling portion has a pair of terminal holes exposing neighboring electrode terminals of the battery cells.

14. The battery pack of claim 11 , wherein the bus bar assembling portion comprises an assembling guide enclosing a corner of the bus bars to define the positions the bus bars.

15. The battery pack of claim 14 , wherein the bus bar assembling portion comprises four assembling guides corresponding to four corners of the bus bars.

16. The battery pack of claim 1 , wherein the inner cover is formed of an injection-molded electrical insulator.

17. The battery pack of claim 1 , wherein the battery cell comprises a plurality of battery cells and wherein the inner cover substantially covers the battery cells.