US 12,240,351 B2
Method for heating a battery in a vehicle and vehicle
Joachim Härsjö, Gothenburg (SE); and Markus Olsson, Gothenburg (SE)
Assigned to Volvo Car Corporation, Gothenburg (SE)
Filed by Volvo Car Corporation, Gothenburg (SE)
Filed on Mar. 4, 2022, as Appl. No. 17/653,572.
Claims priority of application No. 21161309 (EP), filed on Mar. 8, 2021.
Prior Publication US 2022/0281355 A1, Sep. 8, 2022
Int. Cl. B60L 58/27 (2019.01); H01M 10/44 (2006.01); H01M 10/615 (2014.01); H01M 10/625 (2014.01)
CPC B60L 58/27 (2019.02) [H01M 10/443 (2013.01); H01M 10/615 (2015.04); H01M 10/625 (2015.04); B60W 2510/246 (2013.01); B60Y 2200/92 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A method for heating a battery in a vehicle, comprising:
(A) setting, by a control unit, an alternating current (AC) storage device to a first operation mode;
(B) charging the AC storage device by transferring energy stored in a battery to the AC storage device;
(C) determining, by the control unit, whether a charging level of the AC storage device corresponds to a defined upper threshold;
(D) setting, by the control unit, the AC storage device to a second operation mode, when the charging level of the AC storage device is determined to correspond to the defined upper threshold;
(E) discharging the AC storage device by transferring energy stored in the AC storage device to the battery;
(F) determining, by the control unit, whether a charging level of the AC storage device corresponds to a defined lower threshold;
(G) setting, by the control unit, the AC storage device to the first operation mode, when the charging level of the AC storage device is determined to correspond to the defined lower threshold; and
(H) repeating (B) to (G) until the battery is at a defined operation temperature,
wherein the energy being transferred back and forth between the battery and the AC storage device corresponds to reactive power occurring in the AC storage device due to transferring energy from the battery to the AC storage device.