Non-pressure-storage type lithium ion battery fire extinguisher

The non-pressure-storage type lithium ion battery fire extinguisher comprises a cylinder body, an end cover A, an end cover B, a piston and a gas generator, the piston is arranged in the cylinder body, can slide along the cylinder body and is used for isolating different media on the two sides of the piston. The ratio of the diameter to the width of the piston is not greater than 4: 1; the gas generator is fixed on the inner side of the end cover A through a fixing device and is used for generating gas to push the piston to move; a fire extinguishing agent outlet is formed in the end cover B, and a safety mechanism which is used for blocking the fire extinguishing agent and can be automatically conducted when the internal pressure of the fire extinguishing agent is increased is mounted at the fire extinguishing agent outlet; according to the fire extinguisher, by limiting the ratio of the diameter to the width of the piston, the stability of the piston is better, the probability of failure in the piston movem