DE-102025145977-A1 - MULTI-REDUNDANT POWER SUPPLY FOR BATTERY SAFETY SYSTEM

Abstract

A vehicle includes a high-voltage battery and a battery safety system configured to disconnect the high-voltage battery in response to an unsafe condition. The vehicle includes a first voltage domain with an appropriate voltage and ground plane, with the battery safety system located in the first voltage domain. The vehicle includes a second voltage domain that powers vehicle components such as actuators, lights, sensors, or control units. A first DC-DC converter supplies power to the first voltage domain from the high-voltage battery, and a second DC-DC converter supplies power to the second voltage domain from the high-voltage battery. A backup DC-DC converter supplies power to the first voltage domain from the second voltage domain in response to a failure of the first DC-DC converter. The first DC-DC converter can also supply power to the second voltage domain. A capacitor in the second voltage domain can also supply power to the battery safety system.

Inventors

• Shiju WANG
• Long Huynh
• Ajay Kumar

Assignees

• RIVIAN IP HOLDINGS, LLC

Dates

Publication Date

20260513

Application Date

20251107

Priority Date

20241108

Claims (20)

1. System comprising: a high-voltage battery with a voltage of at least 200 volts at full state of charge (SOC); a battery safety system configured to disconnect the high-voltage battery in response to an unsafe condition; a first voltage domain, with the battery safety system located in the first voltage domain; a first direct current-to-direct current (DC-DC) converter configured to supply power to the first voltage domain from the high-voltage battery; a second voltage domain; and a backup DC-DC converter configured to supply power to the first voltage domain from the second voltage domain in response to a failure of the first DC-DC converter.
2. System according to Claim 1 , wherein the battery safety system includes one or more pyrotechnic drivers, each pyrotechnic driver being configured to ignite a pyrotechnic device.
3. System according to Claim 1 , where the battery safety system includes a battery monitor.
4. System according to Claim 1 , wherein the first voltage domain and the second voltage domain have different nominal voltages.
5. System according Claim 1 , where a nominal voltage of the first voltage domain is greater than a nominal voltage of the second voltage domain.
6. System according to Claim 1 , where the first voltage domain and the second voltage domain have different ground planes.
7. System according to Claim 1 , where the first voltage domain and the second voltage domain have nominal voltages of less than 50 volts.
8. System according to Claim 1 , furthermore comprising a second DCDC converter configured to supply the second voltage domain with power from the high-voltage battery.
9. System according to Claim 8 , where the first DCDC is configured to power both the first voltage domain and the second voltage domain.
10. System according Claim 9 , wherein the maximum continuous output power capacity of the second DCDC is at least ten times the maximum continuous output power capacity of the first DCDC.
11. System according Claim 1 , further comprising a low-voltage battery configured to power the second voltage domain, wherein the low-voltage battery has a voltage of less than 50 volts at full SOC.
12. System according to Claim 1 , furthermore encompassing a large number of vehicle components that are coupled to the second voltage domain.
13. System according to Claim 12 , where the multitude of vehicle components includes at least one of actuators, lights, sensors or control units.
14. System according Claim 1 , further comprising a capacitor in the first voltage domain, wherein the capacitor is configured to supply power to the battery safety system in the event of a failure of the backup DCDC.
15. System according to Claim 14 , where the capacitor is connected to the second voltage domain and configured to power the battery safety system via the backup DC-DC converter.
16. Vehicle, comprising: a high-voltage battery with a voltage of at least 200 volts at full state of charge (SOC); one or more drive units configured to power the vehicle using current drawn from the high-voltage battery; a battery safety system configured to disconnect the high-voltage battery in response to an unsafe condition; a first voltage domain, wherein the battery safety system is located in the first voltage domain; a first direct current-to-direct current (DC-DC) converter configured to supply the first voltage domain with current from the high-voltage battery; a second voltage domain; a second DC-DC converter configured to supply the second voltage domain with current from the high-voltage battery; a plurality of vehicle components coupled to the second voltage domain, wherein the plurality of vehicle components includes at least one of the actuators, lights, sensors, or control units; and a backup DCDC configured to supply power to the first voltage domain from the second voltage domain in response to a failure of the first DCDC.
17. Vehicle after Claim 16 , wherein the battery safety system includes one or more pyrotechnic drivers, each configured to ignite a pyrotechnic device.
18. Vehicle after Claim 16 , wherein: the first DCDC is configured to power both the first voltage domain and the second voltage domain; and the maximum continuous output power capacity of the second DCDC is at least ten times the maximum continuous output power capacity of the first DCDC.
19. Vehicle after Claim 16 , further comprising a low-voltage battery configured to power the second voltage domain, wherein the low-voltage battery has a voltage of less than 50 volts at full SOC.
20. Vehicle after Claim 16 , further comprising a capacitor in the first voltage domain, wherein the capacitor is configured to supply power to the battery safety system in the event of a failure of the backup DCDC, wherein the capacitor is connected to the second voltage domain and configured to supply power to the battery safety system via the backup DCDC.

Description

RELATED REGISTRATION This application claims priority over the preliminary US application with serial number 63/718,479 , submitted on November 8, 2024 and entitled “MULTIPLE-REDUNDANT POWER SUPPLY FOR BATTERY SAFETY SYSTEM”, which is hereby incorporated herein by reference in its entirety. SUMMARY According to one aspect, a system includes a high-voltage battery with a voltage of at least 200 volts at full state of charge (SOC). The system includes a battery safety system configured to disconnect the high-voltage battery in response to an unsafe condition. The system includes a first voltage domain, with the battery safety system located in the first voltage domain. A first DC-DC converter is configured to supply power to the first voltage domain from the high-voltage battery. The system further includes a second voltage domain and a backup DC-DC converter configured to supply power to the first voltage domain from the second voltage domain in response to a failure of the first DC-DC converter. In some embodiments, the battery safety system includes one or more pyrotechnic drivers, each configured to ignite a pyrotechnic device. In some embodiments, the battery safety system includes a battery monitor. In some embodiments, the first voltage domain and the second voltage domain have different nominal voltages. In some embodiments, the nominal voltage of the first voltage domain is greater than the nominal voltage of the second voltage domain. In some embodiments, the first voltage domain and the second voltage domain have different ground planes. In some embodiments, the first voltage domain and the second voltage domain have nominal voltages of less than 50 volts. In some embodiments, the system further includes a second DCDC converter configured to supply the second voltage domain with power from the high-voltage battery. In some embodiments, the first DCDC is configured to power both the first voltage domain and the second voltage domain. In some embodiments, the maximum continuous output power capacity of the second DCDC is at least ten times the maximum continuous output power capacity of the first DCDC. In some embodiments, the system further includes a low-voltage battery configured to power the second voltage domain, with the low-voltage battery having a voltage of less than 50 volts at full SOC. In some embodiments, the system further includes a variety of vehicle components that are coupled to the second voltage domain. In some embodiments, the multitude of vehicle components includes at least one of actuators, lights, sensors or control units. In some embodiments, the system further includes a capacitor in the first voltage domain, the capacitor being configured to power the battery safety system in the event of a failure of the backup DC-DC converter. In some embodiments, the capacitor is connected to the second voltage domain and configured to power the battery safety system via the backup DC-DC converter. According to another aspect, a vehicle includes a high-voltage battery with a voltage of at least 200 volts at full state of charge (SOC). The vehicle includes one or more drive units configured to power the vehicle using current drawn from the high-voltage battery. A battery safety system is configured to disconnect the high-voltage battery in response to an unsafe condition. The vehicle includes a first voltage domain, in which the battery safety system resides. The vehicle includes a first direct current-to-direct current (DC-DC) converter configured to The vehicle includes a second voltage domain and a second DC-DC converter configured to supply power to the second voltage domain from the high-voltage battery. The vehicle includes a variety of vehicle components connected to the second voltage domain, including at least one actuator, light, sensor, or control unit. The vehicle includes a backup DC-DC converter configured to supply power to the first voltage domain from the second voltage domain in response to a failure of the first DC-DC converter. In some embodiments, the battery safety system includes one or more pyrotechnic drivers, each configured to ignite a pyrotechnic device. In some embodiments, the first DC-DC converter is configured to supply power to both the first and second voltage domains. The maximum continuous output power capacity of the second DC-DC converter can be at least ten times the maximum continuous output power capacity of the first DC-DC converter. In some embodiments, the vehicle includes a low-voltage battery configured to power the second voltage domain, with the low-voltage battery having a voltage of less than 50 volts at full SOC. In some embodiments, the vehicle includes a capacitor in the first voltage domain, wherein the capacitor is configured to supply power to the battery safety system in the event of a failure of the backup DC-DC, wherein the capacitor is connected to the second voltage domain and is configured to supply power to the battery safety