Spraying system of a battery pack, comprising: a spraying pipeline configured to circulate a fire-fighting fluid, the spraying pipeline being capable of forming an opening after being heated; and a first gas storage portion configured to store a compressed gas, wherein the compressed gas in the first gas storage portion is capable of driving the fire-fighting fluid in the spraying pipeline to be discharged under the action of gas pressure; the spraying system of a battery pack further comprising a liquid storage portion, wherein the compressed gas in the first gas storage portion is further capable of driving the fire-fighting fluid in the liquid storage portion to enter the spraying pipeline under the action of gas pressure; wherein the first gas storage portion and the liquid storage portion are arranged separately but are in communication with each other, and the compressed gas in the first gas storage portion is capable of entering the liquid storage portion; the spraying system of a battery pack comprising two liquid storage portions, wherein the two liquid storage portions are respectively in communication with two ends of the spraying pipeline; and the first gas storage portion is in communication with the two liquid storage portions; or the spraying system of a battery pack comprising two liquid storage portions and two first gas storage portions, wherein one end of each of the two liquid storage portions is respectively in communication with either end of the spraying pipeline, and the other end of each of the two liquid storage portions is respectively in communication with either of the two first gas storage portions; or the spraying system of a battery pack comprising one liquid storage portion and one first gas storage portion, and further comprising one second gas storage portion, wherein one end of the spraying pipeline is in communication with the liquid storage portion, and the other end thereof is in communication with the second gas storage portion. a spraying pipeline configured to circulate a fire-fighting fluid, the spraying pipeline being capable of forming an opening after being heated; and a first gas storage portion configured to store a compressed gas, wherein the compressed gas in the first gas storage portion is capable of driving the fire-fighting fluid in the spraying pipeline to be discharged under the action of gas pressure; the spraying system of a battery pack further comprising a liquid storage portion, wherein the compressed gas in the first gas storage portion is further capable of driving the fire-fighting fluid in the liquid storage portion to enter the spraying pipeline under the action of gas pressure; wherein the first gas storage portion and the liquid storage portion are arranged separately but are in communication with each other, and the compressed gas in the first gas storage portion is capable of entering the liquid storage portion; the spraying system of a battery pack comprising two liquid storage portions, wherein the two liquid storage portions are respectively in communication with two ends of the spraying pipeline; and the first gas storage portion is in communication with the two liquid storage portions; or the spraying system of a battery pack comprising two liquid storage portions and two first gas storage portions, wherein one end of each of the two liquid storage portions is respectively in communication with either end of the spraying pipeline, and the other end of each of the two liquid storage portions is respectively in communication with either of the two first gas storage portions; or the spraying system of a battery pack comprising one liquid storage portion and one first gas storage portion, and further comprising one second gas storage portion, wherein one end of the spraying pipeline is in communication with the liquid storage portion, and the other end thereof is in communication with the second gas storage portion.