VALVE FOR BATTERY

Valve for battery that, applicable to expel the air in case of overpressure generated in a battery because of its cells heating and being constituted from an external body (2) and a plunger (3) that travels inside it pushed by the battery pressure. The valve presents two opening positions, depending on the level of pressure generated, by means of coupling to the said plunger (3), at least: -a first O-ring (5) that closes the passage of the air when there is no pressure and opens it when the plunger (3) moves at a first position from a given degree of pressure, - a second O-ring (6) that prevents the direct exit outside of the air when there is only a first degree of pressure and allows it when the said degree of pressure is exceeded that opens the plunger (3) at second position, and -a ventilation element (4) that allows the passage of the air through it, but not the passage of the water.