Battery pack including coolant leakage safety device

1. A battery pack comprising:

a cell module assembly comprising a plurality of cell modules arranged at a predetermined interval;

a pack structure surrounding and supporting the cell module assembly;

a coolant pipe contacting the plurality of cell modules; and

an absorbing body provided in the pack structure and configured to absorb a coolant when the coolant leaks in the coolant pipe,

wherein a water sensor for detecting that the coolant is absorbed is inserted into in the absorbing body, and

wherein receiving portions, each having a circular or elliptical cross-sectional shape due to sewing of portions adjacent to both edges of the absorbing body, extend in a longitudinal direction of the absorbing body.

2. The battery pack of claim 1 , wherein the absorbing body comprises a superabsorbent polymer that absorbs the coolant and maintains the coolant in a solid state.

3. The battery pack of claim 1 , wherein the coolant pipe is located between adjacent cell modules, and the absorbing body is located under each of the plurality of cell modules.

4. The battery pack of claim 3 , further comprising a heat dissipating plate located under the cell module assembly, wherein the absorbing body is located between the cell module and the heat dissipating plate.

5. The battery pack of claim 1 , wherein the water sensor has a wire or bar shape or a plate shape, and is horizontally located in the absorbing body.

6. The battery pack of claim 1 , wherein the absorbing body has a rectangular body capable of supporting a bottom surface of the cell module.

7. A safety device of a battery pack, the safety device provided in the battery pack comprising a cooling passage, the safety device comprising:

an absorbing body having a body located under a cell module; and

a water sensor inserted into the absorbing body and configured to detect that a leaking coolant is absorbed by the absorbing body,

wherein receiving portions, each having a circular or elliptical cross-sectional shape due to sewing of portions adjacent to both edges of the absorbing body, extend in a longitudinal direction of the absorbing body, and

wherein the water sensor is inserted into each of the receiving portions of the absorbing body.

8. The safety device of claim 7 , wherein the water sensor has a wire or bar shape or a plate shape, and is horizontally located in the absorbing body.

9. The safety device of claim 7 , wherein the absorbing body has a rectangular body capable of supporting a bottom surface of the cell module.

10. A battery pack comprising:

a cell module assembly comprising a plurality of cell modules arranged at a predetermined interval;

a pack structure surrounding and supporting the cell module assembly;

a coolant pipe contacting the plurality of cell modules;

a heat dissipating plate under the cell module assembly; and

an absorbing body provided in the pack structure between the cell module assembly and the heat dissipating plate, and configured to absorb a coolant when the coolant leaks in the coolant pipe,

wherein a portion of the heat dissipating plate between adjacent cell modules has an inclined surface such that the portion of the heat dissipating plate is narrow at an upper end and wide at a bottom end, and

wherein the coolant pipe is at the upper end of the portion of the heat dissipating plate, whereby when the coolant leaks in the coolant pipe, the coolant is guided to flow along the inclined surface toward the absorbing body.

11. The battery pack of claim 10 , wherein the absorbing body comprises a superabsorbent polymer that absorbs the coolant and maintains the coolant in a solid state.

12. The battery pack of claim 10 , wherein the coolant pipe is located between adjacent cell modules, and the absorbing body is located under each of the plurality of cell modules.

13. The battery pack of claim 12 , further comprising a heat dissipating plate located under the cell module assembly, wherein the absorbing body is located between the cell module and the heat dissipating plate.

14. The battery pack of claim 10 , wherein a water sensor for detecting that the coolant is absorbed is provided in the absorbing body.

15. The battery pack of claim 14 , wherein the water sensor is inserted into the absorbing body.

16. The battery pack of claim 15 , wherein the water sensor has a wire or bar shape or a plate shape, and is horizontally located in the absorbing body.

17. The battery pack of claim 15 , wherein receiving portions, each having a circular or elliptical cross-sectional shape due to sewing of portions adjacent to both edges of the absorbing body, extend in a longitudinal direction of the absorbing body.

18. The battery pack of claim 10 , wherein the absorbing body has a rectangular body capable of supporting a bottom surface of the cell module.