Patent ID: 11967842
Assignee: THE BOEING COMPANY
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  B  Y | IPC H

Claim 9:
10. A battery system comprising:
positive and negative busbars;
a battery pack comprising a first battery string that includes first and second half-strings;
a first string contactor connected to the positive busbar and to the first half-string;
a mid-point disconnect circuit connected to the first and second half-strings, wherein the mid-point disconnect circuit comprises a semiconductor switch;
a mid-point current sensor configured to measure current flowing through the mid-point disconnect circuit, wherein;
a smart mid-point disconnect unit configured to open the mid-point disconnect circuit following receipt of an output from the mid-point current sensor indicating over-current flowing through the mid-point disconnect circuit; and
a pyro fuse connected in series with the mid-point disconnect circuit, wherein the smart mid-point disconnect unit is further configured to activate the pyro fuse in response to failure of the semiconductor switch to open.