# US 2014/0152318 A1 · High voltage service disconnect assembly and method for determining an isolation resistance fault of a battery pack > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0152318 A1 - Document ID: US20140152318A1 - Status: Published application - Kind: A1 - Application number: 13/692,705 - Filed: 2012-12-03 - Published: 2014-06-05 - Earliest claimed: 2012-12-03 - Assignees: LG Chem, Ltd. - Inventors: Joseph Bertrand; Daniel K. McNeill - Web page: https://patentgrep.com/patent/US20140152318A1 ## CPC - G01R 31/52: Testing for short-circuits, leakage current or ground faults - G01R 31/3835: involving only voltage measurements - G01R 31/006: {on road vehicles, e.g. automobiles or trucks (testing of ignition installations peculiar to internal combustion engines F02P17/00)} - G01R: MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES (indicating correct tuning of resonant circuits H03J3/12) ## Abstract A high voltage service disconnect assembly is provided. The battery pack has an enclosure, first and second battery modules, and positive and negative pack voltage terminals. The assembly includes a housing securing first and second conductive pins thereon. The first conductive pin is coupled to a negative voltage terminal of the first battery module. The second conductive pin is coupled to a positive voltage terminal of the second battery module. The assembly further includes a detection circuit electrically coupled to the first and second conductive pins. The detection circuit outputs a first isolation resistance fault signal when a first isolation resistance fault is detected between the negative pack voltage terminal and the enclosure. ## Claims ### Claim 1 A high voltage service disconnect assembly for determining an isolation resistance fault of a battery pack, the battery pack having an enclosure, a first battery module, a second battery module, a positive pack voltage terminal, a negative pack voltage terminal, comprising: a housing configured to secure first and second conductive pins thereon, the first conductive pin configured to be removably electrically coupled to a negative voltage terminal of the first battery module, the second conductive pin configured to be removably electrically coupled to a positive voltage terminal of the second battery module; a detection circuit disposed in the housing and electrically coupled to the first and second conductive pins, the detection circuit configured to output a first isolation resistance fault signal when a first isolation resistance fault is detected between the negative pack voltage terminal and the enclosure; and a first light emitting device electrically coupled to the detection circuit, the first light emitting device configured to emit light in response to the first isolation resistance fault signal. ### Claim 2 (depends on 1) The high voltage service disconnect assembly of claim 1, wherein the detection circuit includes a first comparator circuit having a first comparator, a first voltage divider circuit, and a first resistor; the first comparator having a first non-inverting input terminal, a first inverting input terminal, and a first output terminal; the first non-inverting input terminal being electrically coupled through the first voltage divider circuit to the negative voltage terminal of the first battery module, the first inverting input terminal being electrically coupled to the enclosure, the first inverting input terminal being further electrically coupled through the first resistor to the negative voltage terminal of the first battery module, the first comparator configured to output the first isolation resistance fault signal on the first output terminal when a first voltage on the first non-inverting input terminal is greater than a second voltage on the first inverting input terminal indicating that the first isolation resistance fault has been detected between the negative pack voltage terminal and the enclosure; and the first light emitting device being electrically coupled to the first output terminal. ### Claim 3 (depends on 2) The high voltage service disconnect assembly of claim 2, wherein the first voltage divider circuit includes second and third resistors and a first electrical node electrically coupled between the second and third resistors, the second and third resistors being electrically coupled in series between the negative voltage terminal of the first battery module and a second electrical node, the first electrical node being electrically coupled to the first non-inverting input terminal such that the first non-inverting input terminal is electrically coupled through the first voltage divider circuit to the negative voltage terminal of the first battery module. ### Claim 4 (depends on 1) The high voltage service disconnect assembly of claim 1, wherein the detection circuit is further configured to output a second isolation resistance fault signal when a second isolation resistance fault has been detected between the positive pack voltage terminal and the enclosure. ### Claim 5 (depends on 4) The high voltage service disconnect assembly of claim 4, wherein the detection circuit further comprises a second comparator circuit having a second comparator, a second voltage divider circuit, and a second resistor; the second comparator having a second non-inverting input terminal, a second inverting input terminal, and a second output terminal; the second inverting input terminal being electrically coupled through the second voltage divider circuit to the positive voltage terminal of the second battery module, the second non-inverting input terminal being electrically coupled to the enclosure, the second non-inverting input terminal being further electrically coupled through the second resistor to a first electrical node, the second comparator configured to output the second isolation resistance fault signal on the second output terminal when a first voltage on the second non-inverting input terminal is greater than a second voltage on the second inverting input terminal indicating that the second isolation resistance fault has been detected between the positive pack voltage terminal and the enclosure. ### Claim 6 (depends on 5) The high voltage service disconnect assembly of claim 5, wherein the second voltage divider circuit further includes second and third resistors and a second electrical node electrically coupled between the second and third resistors, the second and third resistors being electrically coupled in series between the positive voltage terminal of the second battery module and the first electrical node, the second electrical node being further electrically coupled to the second inverting input terminal such that the second inverting input terminal is electrically coupled through the second voltage divider circuit to the positive voltage terminal of the second battery module. ### Claim 7 (depends on 5) The high voltage service disconnect assembly of claim 5, wherein the first light emitting device being further electrically coupled to the second output terminal, the first light emitting device further configured to emit light in response to the second isolation resistance fault signal. ### Claim 8 (depends on 5) The high voltage service disconnect assembly of claim 5, further comprising a second light emitting device electrically coupled to the second output terminal, the second light emitting device further configured to emit light in response to the second isolation resistance fault signal. ### Claim 9 (depends on 1) The high voltage service disconnect assembly of claim 1, wherein the first light emitting device is disposed on an exterior surface of the enclosure. ### Claim 10 (depends on 1) The high voltage service disconnect assembly of claim 1, further comprising a fuse being electrically coupled in series between the first and second conductive pins. ### Claim 11 (depends on 1) The high voltage service disconnect assembly of claim 1, wherein an electrical short circuit is present between the first and second conductive pins. ### Claim 12 A method for determining an isolation resistance fault of a battery pack utilizing a high voltage service disconnect assembly, the battery pack having an enclosure, a first battery module, a second battery module, a positive pack voltage terminal, a negative pack voltage terminal; the high voltage service disconnect assembly having a housing, a detection circuit, and a first light emitting device; the housing configured to secure first and second conductive pins thereon, the first conductive pin configured to be removably electrically coupled to a negative voltage terminal of the first battery module, the second conductive pin configured to be removably electrically coupled to a positive voltage terminal of the second battery module; the method comprising: outputting a first isolation resistance fault signal from the detection circuit when a first isolation resistance fault is detected between the negative pack voltage terminal and the enclosure, the detection circuit being electrically coupled to the first and second conductive pins; and emitting light from the first light emitting device electrically coupled to the detection circuit in response to the first isolation resistance fault signal. ### Claim 13 (depends on 12) The method of claim 12, further comprising outputting a second isolation resistance fault signal from the detection circuit when a second isolation resistance fault has been detected between the positive pack voltage terminal and the enclosure. ### Claim 14 (depends on 13) The method of claim 13, further comprising emitting light from the first light emitting device in response to the second isolation resistance fault signal. ### Claim 15 (depends on 13) The method of claim 13, further comprising emitting light from a second light emitting device in response to the second isolation resistance fault signal.