Railway vehicle lithium battery safety protection system

The invention discloses a railway vehicle lithium battery safety protection system. Compared with the prior art, redundancy setting is carried out on the whole monitoring line, and the reliability and safety of fault alarm are improved. And on the other hand, the second battery state monitoring unit performs fault judgment and identification through a pure hardware circuit, so that the reliability of fault alarm is further improved. When the lithium battery works, the first fire detector and the second fire detector work at the same time and are mutually redundant. When the lithium battery does not work, the second fire detector can still extinguish fire through the temperature sensing magnetic power generation device when the battery is overheated. According to the invention, adhesion fault detection can be carried out, main contact fault detection can also be carried out, and fault early warning can be carried out when a fault is detected, so that maintenance and replacement can be carried out in time, and