US 11,658,503 B2
Charging time computation method and charge control device
Hidetoshi Arizono, Kanagawa (JP)
Assigned to Nissan Motor Co., Ltd., Yokohama (JP)
Appl. No. 16/635,207
Filed by Nissan Motor Co., Ltd., Yokohama (JP)
PCT Filed Jul. 31, 2017, PCT No. PCT/JP2017/027750
§ 371(c)(1), (2) Date Jan. 30, 2020,
PCT Pub. No. WO2019/026143, PCT Pub. Date Feb. 7, 2019.
Prior Publication US 2020/0373779 A1, Nov. 26, 2020
Int. Cl. H02J 7/00 (2006.01); H01M 10/48 (2006.01); H01M 10/44 (2006.01)
CPC H02J 7/007194 (2020.01) [H01M 10/48 (2013.01); H02J 7/0048 (2020.01); H02J 7/007182 (2020.01); H02J 7/007192 (2020.01); H01M 10/443 (2013.01); H01M 10/488 (2013.01)] 4 Claims
OG exemplary drawing
 
1. A charge-time calculation method for calculating a total charge time for charging a battery to a predetermined target state of charge by a charge power from a charger comprising:
detecting:
a battery temperature showing a temperature of the battery using a temperature sensor; and
a battery surrounding temperature showing a surrounding temperature of the battery by using another temperature sensor;
detecting a voltage of the battery by using a voltage sensor;
calculating a state of charge of the battery based on the voltage of the battery;
calculating a chargeable power of the battery based on the voltage of the battery and a charge upper-limit voltage of the battery;
comparing the chargeable power and an outputtable power of the charger to set a lower power as a first charge power;
calculating a timing that the battery temperature reaches a predetermined limit temperature as a first timing, based on the battery temperature, the battery surrounding temperature, and a charge current when charging with the first charge power, the predetermined limit temperature being a temperature at which the charge current is limited to a current that does not raise the battery temperature;
calculating a second charge power that is reduced according to the battery temperature to a power below the first charge power;
calculating a second charge time based on the state of charge when the first timing is reached and the second charge power, wherein the second charge time is a charge time after the first timing and is calculated by referencing a map showing correspondence between the charge power, the state of charge, the battery temperature, and the charge time of the battery;
calculating a second timing where the chargeable power becomes below the outputtable power after start of the battery charge; and
when the second timing comes earlier than the first timing, calculating a total charge time based on the state of charge of the battery at the start of battery charging, the first charge power, and the second charge time while referencing the map, wherein the first charge time is a charge time calculated from a starting time of charging the battery to the first timing.