With increasing in the number and scale of lithium ion batteries（LIBs） in the application of electric vehicles and energy storage

the safety issues are becoming increasingly prominent.We classified domestic and foreign patents about LIB safe protection technology in accordance with the technology category and analyzed the application amount over the years

regional distribution

technology life cycle

technology classification

and applicant.In terms of the patent application amount over the years

the top three are China

Korea

and Japan.In terms of the technology life cycle

it is in a period of rapid development

and the patent applicant and number increase year by year.In the terms of technology classification

the patent number of LIB safe protection technology（internal protection

such as explosion proof valve） is the most

the second is about battery material（positive temperature element（PTC） and cemaricseperator）

the last is about battery safe state monitor technology.Based on the primary and secondary classification

patents about battery safe state monitor

explosion and fire protection are screened out and analyzed.Finally

the possible directions for future technological development are proposed.