Patent ID: 8852769
Filing Date: 2014-10-07
Classification: H01M,Y02E,Y02P,Y02T,Y10T

Abstract:
1. A nonaqueous electrolyte secondary battery comprising: an electrode assembly including a positive electrode plate, a negative electrode plate, and a separator interposed between the positive electrode plate and the negative electrode plate; an outer body housing the electrode assembly and a nonaqueous electrolyte; and a current cutoff mechanism that cuts off a current in response to a rise in pressure inside the outer body in at least one of a conductive path through which a current is taken out from the positive electrode plate to outside of the battery and a conductive path through which a current is taken out from the negative electrode plate to outside of the battery, at least one type selected from an oligomer of a compound containing a cyclohexyl group and a phenyl group, a polymer of a compound containing a cyclohexyl group and a phenyl group, a modified product of the oligomer of the compound containing a cyclohexyl group and a phenyl group, and a modified product of the polymer of the compound containing a cyclohexyl group and a phenyl group being present on the surface of the positive electrode plate; wherein the battery is able to work as a secondary battery; and wherein the current cutoff mechanism operates at a pressure of 0.4 MPa to 1.5 MPa, and the time required for the operation of the current cutoff mechanism is within 1000 seconds from a start of a constant current charge of 4 C that is performed under an environment of −10° C. after a battery voltage is set to 4.1 V and a battery temperature is set to −10° C.