Abstract: A method for managing a lithium-ion battery including stacked cells each of which is provided with an electrolyte solution, includes: measuring first voltages of the stacked cells, respectively, in a highly charged state; calculating first deviation in the first voltages; measuring second voltages of the stacked cells, respectively, in a less charged state after the highly charged state; calculating second deviation in the second voltages; and comparing the first deviation and the second deviation to determine whether a micro short circuit due to a dendrite occurs.

Abstract: A method for decreasing a dendrite generated in a lithium-ion battery includes: charging the lithium-ion battery so that the dendrite is generated due to precipitation of a foreign metal other than a cathode active material mixture and an anode active material mixture in an electrolyte solution filling the lithium-ion battery; and charging the lithium-ion battery to maintain an SOC of the lithium-ion battery at a predetermined value for more than a predetermined time to decrease the dendrite.

Abstract: In a prior-art nail puncture test, it has been difficult to measure the temperature at a short-circuiting portion, which is closely related to the scale of an accident which occurs. As a solution, A nail puncture test device having a temperature measurement function, a sheath thermocouple, and a fixing portion 6 of the sheath thermocouple, wherein a bottomed hole through which the sheath thermocouple is inserted is bored in the axial direction from a head portion to the vicinity of the distal end at the center part of the outer frame, and the sheath thermocouple is fixed to the outer frame by the fixing portion 6 in a state where the sheath thermocouple is inserted into the bottomed hole and the distal end thereof having a temperature measurement point is in contact with the bottom of the hole is provided.

Abstract: In a prior-art nail puncture test, it has been difficult to measure the temperature at a short-circuiting portion, which is closely related to the scale of an accident which occurs. As a solution, A nail puncture test device having a temperature measurement function, a sheath thermocouple, and a fixing portion 6 of the sheath thermocouple, wherein a bottomed hole through which the sheath thermocouple is inserted is bored in the axial direction from a head portion to the vicinity of the distal end at the center part of the outer frame, and the sheath thermocouple is fixed to the outer frame by the fixing portion 6 in a state where the sheath thermocouple is inserted into the bottomed hole and the distal end thereof having a temperature measurement point is in contact with the bottom of the hole is provided.