US 12,394,997 B2
High-voltage battery disconnect method and motor vehicle using the same
Shifang Li, Shelby Township, MI (US); Seungwoo Paik, Wixom, MI (US); Li-Pen John Ho, Farmington Hills, MI (US); and Andrew K. Chandler, Plymouth, MI (US)
Assigned to GM Global Technology Operations LLC, Detroit, MI (US)
Filed by GM GLOBAL TECHNOLOGY OPERATIONS LLC, Detroit, MI (US)
Filed on Aug. 12, 2022, as Appl. No. 17/887,011.
Prior Publication US 2024/0055876 A1, Feb. 15, 2024
Int. Cl. H02J 7/00 (2006.01); H01M 10/42 (2006.01)
CPC H02J 7/0031 (2013.01) [H01M 10/425 (2013.01); H02J 7/00309 (2020.01); H01M 2010/4271 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method for controlling a battery electric system of a motor vehicle, the battery electric system including a direct current (DC) voltage bus having a positive bus rail and a negative bus rail, at least one battery pack connected to the DC voltage bus and having a positive battery terminal and a negative battery terminal, and a battery disconnect unit (BDU), the method comprising:
disconnecting the at least one battery pack from the DC voltage bus by performing, via the BDU, a first battery disconnect process upon detecting an event condition, the first battery disconnect process utilizing a main pyro fuse;
disconnecting the at least one battery pack from the DC voltage bus by performing, via the BDU, a second battery disconnect process upon detecting a high overcurrent condition, the second battery disconnect process utilizing one or more of thermal fuses, solid-state relays (SSRs) and current sensors; and
disconnecting the at least one battery pack from the DC voltage bus by performing, via the BDU, a third battery disconnect process upon detecting a low overcurrent condition, the third battery disconnect process utilizing one or more contactors or one or more SSRs, wherein the low overcurrent condition is related to an accessory load, a power inverter module (PIM), or a DC fast-charging (DCFC) event.