Battery heat dissipation and fire extinguishing system and battery

The invention discloses a battery heat dissipation and fire extinguishing system which comprises a shell, a bifurcated pipe, a front heat dissipation device and a rear heat dissipation device. The bifurcated pipe is respectively communicated with the shell and the rear radiator, and a Tesla pipe, an accelerating pipe, a vortex pipe, a catalyst and a buzzer are sequentially arranged on a pipeline for communicating the bifurcated pipe and the rear radiator. A cooling fan is arranged below the front radiator, and branch pipelines are arranged on the two sides of an impeller installation part of the cooling fan. The rear radiator is installed on a bottom plate of the shell, and a heat insulation plate is further arranged between the rear radiator and the bottom plate. When the battery pack is subjected to thermal runaway, airflow flows to the front radiator through the pipeline and is subjected to primary heat dissipation through the heat dissipation fan; then the air passes through an air inlet pipeline of the v