FIREFIGHTING DEVICE, BATTERY PACK, ENERGY STORAGE SYSTEM, AND ELECTRIC VEHICLE

Embodiments of this application relate to the energy field, and provide fire extinguishing equipment, a battery pack, an energy storage system, and an electric vehicle, to resolve low applicability of a fire extinguisher and low precision in extinguishing a fire of a battery pack. The fire extinguishing equipment is alternatively understood as a fire extinguisher. The fire extinguishing equipment includes a first chamber, a second chamber, and an activation line. The first chamber stores a fire extinguishing chemical agent, the second chamber stores a gas-generating chemical agent, and the activation line extends into the second chamber to be in contact with the gas-generating chemical agent. The second chamber includes a pressure relief opening, and the pressure relief opening is in communication with the first chamber, and is configured to spray the gas in the second chamber to the first chamber. In other words, the second chamber sprays the gas inside the second chamber into the first chamber through the pressure relief opening. The first chamber includes a discharge opening, and the discharge opening is configured to discharge the fire extinguishing chemical agent in the first chamber after the gas generated after the gas-generating chemical agent is ignited enters the first chamber. In other words, the first chamber discharges the fire extinguishing chemical agent inside the first chamber through the discharge opening.