Battery module

1. A battery module comprising:

a plurality of battery cells aligned in one direction, each of the battery cells comprising electrode tabs protruding from one surface of the battery cell;

a temperature sensor having a first surface contacting the one surface of at least one battery cell of the plurality of battery cells to measure a temperature of the at least one battery cell; and

a case comprising a leaf spring configured to press against a second surface of the temperature sensor opposite to the first surface,

wherein contact between the first surface of the temperature sensor and the at least one battery cell is maintained by the leaf spring.

2. The battery module of claim 1 , wherein the case comprises:

end plates respectively positioned adjacent one or more outermost battery cells of the plurality of battery cells;

a connecting plate configured to connect the end plates; and

a cover configured to cover the surfaces of the plurality of battery cells from which the electrode tabs protrude.

3. The battery module of claim 2 , wherein the electrode tabs of the at least one battery cell protrude from the one surface of the at east one battery cell toward the cover.

4. The battery module of claim 1 , further comprising:

bus-bars configured to electrically connect the electrode tabs of the plurality of battery cells; and

a bus-bar holder positioned to cover surfaces of the electrode tabs of the plurality of battery cells, the bus-bar holder being positioned between the plurality of battery cells and the bus-bars,

wherein the cover covers the bus-bars and the bus-bar holder.

5. The battery module of claim 4 , wherein the temperature sensor is configured to be inserted through an opening in the bus-bar holder so as to contact the at least one battery cell of the plurality of battery cells.

6. The battery module of claim 1 , wherein the case comprises the leaf spring pressing the temperature sensor in the direction of the at least one battery cell.

7. The battery module of claim 6 , wherein the case comprises the leaf spring formed by cutting the case.

8. The battery module of claim 7 , wherein the leaf spring has a rib extended along a length of the leaf spring.

9. The battery module of claim 6 , wherein the second surface of the temperature sensor has a groove, and the leaf spring comprises a protruding portion configured to be mounted in the groove.

10. The battery module of claim 1 , wherein:

the first surface of the temperature sensor comprises a metal portion;

the second surface of the temperature sensor comprises a resin portion configured to cover an outer surface of the metal portion; and

wherein the temperature sensor further comprises:

a head in contact with an inner surface of the metal portion, the head being configured to measure a temperature of the at least one battery cell; and

a connecting portion configured to provide the temperature of the at least one battery cell as measured by the head to a protective circuit module or a battery control system.

11. The battery module of claim 10 , wherein at least portions of the head and the connecting portion are positioned inside a structure formed by the metal portion and the resin portion.

12. A battery module comprising:

a plurality of battery cells aligned in one direction;

a temperature sensor having a first surface contacting at least one of the battery cells and being configured to measure a temperature of the at least one battery cell; and

a case having a bent portion contacting a second surface of the temperature sensor opposite to the first surface, the bent portion comprising a leaf spring to press the first surface of the temperature sensor onto the at least one battery cell.