The invention provides a battery on-line monitoring method, device, equipment and
system. The method comprises the steps: acquiring, in real time, first operation parameter data corresponding to at least one battery in a one-to-one mode and second operation parameter data corresponding to a
battery pack comprising at least one battery; monitoring whether the first operation parameter data and thesecond operation parameter data are abnormal or not, and sending a first-stage
alarm signal to an upper computer if the first operation parameter data and the second operation parameter data are abnormal; monitoring the variable quantities of the first operation parameter data and the second operation parameter data, and comparing the variable quantities with a first threshold value and a second threshold value respectively; and when the variable quantity of the first operation parameter data is greater than a first threshold value and the variable quantity of the second operation parameter data is greater than a second threshold value, sending a second-stage
alarm signal to the upper computer, and meanwhile,
cutting off battery power supply to realize fault protection. Compared with the prior art, the method has the advantages that the battery operation state can be monitored in real time, an
alarm signal is sent in time to remind a user, battery power supply is
cut off when a seriousfault occurs, and serious safety accidents are avoided. Besides, the battery temperature threshold value is monitored in real time, and the battery over-temperature protection is realized by monitoring the
abnormality of the temperature variation of the battery in real time, so that the reaction is sensitive, the accuracy is high, and the misjudgment risk is greatly reduced.