Fire suppression apparatus for a battery pack

1. A fire suppression apparatus for a battery pack, comprising:

a fire detection sensor for detecting a probability of fire occurrence in a battery pack;

a fire-extinguishing chemical tank containing a fire-extinguishing chemical, wherein the fire-extinguishing chemical tank includes an outlet connected to the inside of the battery pack to discharge the fire-extinguishing chemical, a piston to discharge the fire-extinguishing chemical through the outlet by means of movement, and an explosive to move the piston by explosion;

a first outlet valve to open or close the outlet of the fire-extinguishing chemical tank; and

a control unit programmed to allow the fire-extinguishing chemical of the fire-extinguishing chemical tank into the battery pack when fire occurrence is detected by the fire detection sensor,

wherein when fire occurrence is detected, the first outlet valve is opened under the control of the control unit, and the control unit subsequently explodes the explosive of the fire-extinguishing chemical tank to move the piston so that the fire-extinguishing chemical is injected into the battery pack.

2. The fire suppression apparatus for a battery pack according to claim 1 ,

wherein the first outlet valve is a check valve.

3. The fire suppression apparatus for a battery pack according to claim 1 ,

wherein the fire-extinguishing chemical tank further includes a cap provided at the outlet to close the outlet, the cap opening the outlet when the pressure in the fire-extinguishing chemical tank is over a predetermined level.

4. The fire suppression apparatus for a battery pack according to claim 1 ,

wherein the fire detection sensor includes at least one of a temperature sensor, an impact sensor and a pressure sensor.

5. The fire suppression apparatus for a battery pack according to claim 1 , further comprising a gas discharge unit provided to at least a part of the battery pack to discharge an internal gas of the battery pack.

6. The fire suppression apparatus for a battery pack according to claim 5 ,

wherein the gas discharge unit includes a gas discharge hole formed from the inside of the battery pack to the outside and a gas valve for opening or closing the gas discharge hole.

7. The fire suppression apparatus for a battery pack according to claim 1 , wherein the fire-extinguishing chemical is injected into the battery pack in a liquid or gas state.

8. The fire suppression apparatus for a battery pack according to claim 1 ,

wherein the control unit is implemented by a battery management system (BMS) of the battery pack.

9. A battery pack, which includes the fire suppression apparatus defined in the claim 1 .

10. A vehicle, which includes the fire suppression apparatus defined in the claim 1 .

11. A method for detecting and suppressing fire in a battery pack, comprising:

detecting a fire in a battery pack;

opening a first outlet valve of an outlet of a fire-extinguishing chemical tank, wherein the outlet connects to the inside of the battery pack and wherein the fire-extinguishing chemical tank contains a fire-extinguishing chemical;

subsequent to opening the first outlet valve, exploding an explosive contained within the fire-extinguishing chemical tank to move a piston contained within the fire-extinguishing chemical tank; and

injecting the fire-extinguishing chemical through the outlet and into the battery pack by the movement of the piston.

12. The method of claim 11 , wherein detecting the fire further comprises:

detecting at least one of temperature, pressure, or impact to determine an occurrence of the fire in the battery pack.

13. The method of claim 11 , wherein the fire-extinguishing chemical is injected into the battery pack in a liquid or gas state.

14. The method of claim 11 , further comprising:

discharging an internal gas of the battery pack.

15. The method of claim 14 , wherein the internal gas is generated by the fire in the battery pack.