# US 11,451,073 B2 · Control arrangement for a high-voltage battery and method for operating such a control arrangement > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,451,073 B2 - Document ID: US11451073B2 - Status: Granted - Kind: B2 - Application number: 17/083,739 - Filed: 2020-10-29 - Published: 2021-04-29 - Granted: 2022-09-20 - Earliest claimed: 2019-10-29 - Assignees: Volkswagen Aktiengesellschaft - Applicants: Volkswagen Aktiengesellschaft - Inventors: Florian Quantmeyer; Florian Kühnlenz - Web page: https://patentgrep.com/patent/US11451073B2 ## CPC - H02J 7/663: {using battery or load disconnect circuits (H02J9/002 takes precedence)} - B60R 16/033: characterised by the use of electrical cells or batteries (for propulsion puposes B60K1/04; supplying batteries to, or removing batteries from, vehicles B60S5/06; testing of charge state G01R31/36) - H02J 7/63: against overdischarge - H02J 7/82: Control of state of charge [SOC] - H02J 7/855: {with circuits adapted for supplying loads from the battery} - H02J 2207/10: Control circuit supply, e.g. means for supplying power to the control circuit - H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY - B60R: VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR ## Abstract A control arrangement for a high-voltage battery in a motor vehicle, encompasses at least a high-voltage battery having an electric first connection in order to provide a first supply voltage for a motor vehicle as well as a control unit for the high-voltage battery which, in the control arrangement of the motor vehicle, is connected exclusively to the high-voltage battery via an electric second connection in order to provide a second supply voltage for the control unit, whereby the second connection comprises a switching element that can be switched by the control unit in order to establish and disconnect the second connection. Moreover, a method for operating a control arrangement for a high-voltage battery in a motor vehicle is also described. ## Claims ### Claim 1 A control arrangement for a high-voltage battery in a motor vehicle, comprising: a high-voltage battery having an electric first connection in order to provide a first supply voltage for the motor vehicle, and a control unit for the high-voltage battery which, in the control arrangement of the motor vehicle, is connected exclusively to the high-voltage battery via an electric second connection in order to provide a second supply voltage for the control unit, whereby the second connection comprises a switching element that can be switched by the control unit in order to establish and disconnect the second connection. ### Claim 2 (depends on 1) The control arrangement according to claim 1, whereby the control unit is connected to the high-voltage battery via a voltage converter arranged in the second connection, whereby the second supply voltage generated by the voltage converter is lower than the first supply voltage. ### Claim 3 (depends on 1) The control arrangement according to claim 1, further comprising a connector for connecting a vehicle-external service plug and by which the control unit can be operated with the second supply voltage. ### Claim 4 A method for operating a control arrangement for a high-voltage battery in a motor vehicle, whereby the control arrangement comprises at least a high-voltage battery having an electric first connection in order to provide a first supply voltage for the motor vehicle as well as a control unit for the high-voltage battery which, in the control arrangement of the motor vehicle, is connected exclusively to the high-voltage battery via an electric second connection in order to provide a second supply voltage for the control unit, whereby the second connection comprises a switching element that can be switched by the control unit in order to establish and disconnect the second connection, the method comprising the following steps: a) determining a momentary state of charge of the high-voltage battery by means of the control unit; and b) if the momentary state of charge has fallen below a limit value, disconnecting the second connection. ### Claim 5 (depends on 4) The method according to claim 4, whereby the first connection has a switching element that can be switched by the control unit (at least to disconnect the first connection; whereby, prior to step b), the following steps are carried out: i. carrying out step a), and, ii. only if/not until the momentary state of charge has fallen below a first limit value, disconnecting the first connection, and iii. carrying out step a), and, iv. only if/not until the momentary state of charge has fallen below a second limit value, carrying out step b). ### Claim 6 (depends on 4) The method according to claim 4, further comprising immediately before step b), storing a status signal in a non-volatile storage medium of the control unit. ### Claim 7 (depends on 4) The method according to claim 4, whereby the control arrangement has a connector for connecting a vehicle-external service plug via which the control unit can be operated with the second supply voltage, further comprising, after step b), establishing the first connection via a control command transmitted via the service plug. ### Claim 8 (depends on 7) The method according to claim 7, further comprising, once the first connection has been established, charging the high-voltage battery via a vehicle-external charger. ### Claim 9 (depends on 7) The method according to claim 7, further comprising: ascertaining a momentary state of charge of the high-voltage battery by a service device that is connected to the control unit via the service plug, and if it is ascertained by means of the service device that the state of charge has fallen below a third limit value, preventing the establishment of the first connection. ### Claim 10 (depends on 4) The method according to claim 4, whereby, after step b), the second connection is re-established only when the high-voltage battery has reached a state of charge that exceeds a fourth limit value.