US 12,444,957 B2
Battery disconnect mechanization for direct current fast charging
Rashmi Prasad, Troy, MI (US); and Chandra S. Namudur, Troy, MI (US)
Assigned to GM GLOBAL TECHNOLOGY OPERATIONS LLC, Detroit, MI (US)
Filed by GM GLOBAL TECHNOLOGY OPERATIONS LLC, Detroit, MI (US)
Filed on May 20, 2022, as Appl. No. 17/749,215.
Prior Publication US 2023/0378776 A1, Nov. 23, 2023
Int. Cl. H02J 7/00 (2006.01); B60L 53/10 (2019.01); H01H 71/12 (2006.01)
CPC H02J 7/0031 (2013.01) [B60L 53/11 (2019.02); H01H 71/12 (2013.01); H02J 7/0068 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A battery system, comprising:
a first battery pack including first and second terminals and configured to be selectively connected to (i) an output terminal of the battery system and (ii) a direct current fast charging (DCFC) receptacle;
a first contactor connected between the DCFC receptacle and the first terminal of the first battery pack, wherein the first contactor has an open state where current from the DCFC receptacle to the first battery pack is interrupted and a closed state where current flows from the DCFC receptacle to the first battery pack; and
a first solid state relay (SSR) connected in series with the first contactor between the DCFC receptacle and the first terminal of the first battery pack, wherein the first SSR has an open state where current from the DCFC receptacle to the first battery pack is interrupted and a closed state where current flows from the DCFC receptacle to the first battery pack,
wherein the first SSR is configured to transition from the closed state to the open state prior to the first contactor, and
wherein current only flows from the DCFC receptacle to the first battery pack when both the first contactor and the first SSR are in the closed state.