Method for detecting short-circuit of cell roll core

The invention relates to the technical field of lithium ion battery detecetion, and particularly relates to a method for detecting short-circuit of a cell roll core. The method includes steps of heating step: heating a cell roll core to be tested to 85-100 DEG C; detecting step: connecting the heated cell roll core with a short-circuit tester, setting the testing voltage as being less than 200V, and detecting inner resistance of the cell roll core; judging step: if the detection shows that the inner resistance is more than or equal to the normal inner resistance of the cell roll core, judgingthat the cell roll core is not short-circuited; if the detection shows that the inner resistance is less than the normal inner resistance of the cell roll core, judging that the cell roll core is short-circuited or slight short-circuited. For the testing voltage in testing is less than the voltage in testing at room temperature, the voltage is low, and the risk that a diaphragm is easily puncturedby arc under high pressur