Determination method of battery pack and manufacturing method of vehicle
A determination method for determining whether or not a battery pack is normal, the method comprising a step of measuring a time-dependent change in at least one of a temperature and an output voltage of the battery pack while heating the battery pack, and determining whether or not the battery pack is normal based on the measured time-dependent change. According to this determination method, it is possible to accurately determine whether or not the battery pack is normal.
1 . A determination method of determining whether a battery pack has a first characteristic that the battery pack is genuine, the determination method comprising a step of measuring both a temperature and an output voltage of the battery pack simultaneously while heating the battery pack, and determining whether the battery pack has the first characteristic based on the measured temperature and output voltage of the battery pack while heating the battery pack, wherein
in the step, a first determination is made based on whether a temperature increase amount of the battery pack with respect to an ambient temperature around the battery pack exceeds a reference value, a second determination is made based on whether a voltage decrease amount exceeds a threshold value, and the battery pack is determined to have a second characteristic, that the battery pack is non-genuine, when either the first determination or the second determination indicates that the battery pack has the second characteristic, the ambient temperature around the battery pack being a temperature in a furnace.
2 . The determination method according to claim 1 , wherein in the step, the ambient temperature around the battery pack is controlled to be a constant value.
3 . The determination method according to claim 2 , wherein in the step, the temperature in the furnace is increased to a predetermined temperature and thereafter maintained at the predetermined temperature for a predetermined time.
4 . A manufacturing method comprising:
a step of executing the determination method according to claim 1 ; and
a step of installing the battery pack determined to have the first characteristic in the determination method in a vehicle.
5 . The determination method according to claim 1 , wherein in the step, the temperature increase amount resulting from self-heating due to an internal abnormality in the battery pack is monitored.