Humidity monitoring is the basic function of Li-ion power battery pack protection system.Considering the low precision humidity measurements problem existed in portection system

a new humidity monitoring design is presented to improve the presicision of humidity measurements.Based on humidity linear measurements of humidity sensor HS1101

the design technology of frequency acquisition and corrected method of scale coefficient is presented.Experimental results show that the design is capable of passing the humidity monitoring test of large-capacity Li-ion power battery pack protection system.