Split battery for autonomous driving

Patent metadata

Field	Value
Publication number	US-11705749-B2
Application number	US-202117231543-A
Country	US
Kind code	B2
Filing date	Apr 15, 2021
Priority date	Sep 11, 2017
Publication date	Jul 18, 2023
Grant date	Jul 18, 2023

Abstract

Methods and systems are provided for managing multi-battery systems, such as those utilized in an electric vehicle. Multi-battery systems comprise batteries providing power in parallel, thereby making each battery available to the vehicle and avoiding the weight of transporting a backup battery. The methods and systems provided allow for a fault in one battery, in a parallel configuration with at least one other battery, to be detected and managed.

First claim

What is claimed is:

1. A system, comprising:
a main controller that generates and sends, upon determining that first sensor data from a first battery sensor monitoring an attribute of a first battery indicates a fault with the first battery, a first control signal to a first battery switch to isolate the first battery from a load while maintaining uninterrupted power to the load with a second battery during a period of time in which the first battery switch is switched to isolate the first battery from the load, the second battery being connected in parallel with the first battery.

2. The system of claim 1 , further comprising:
the first battery;
the second battery;
the first battery sensor;
the first battery switch;
a second battery sensor that monitors an attribute of the second battery to output second sensor data; and
a second battery switch,
wherein the main controller generates and sends, upon determining the second sensor data indicates a fault with the second battery, a second control signal to the second battery switch to isolate the second battery from the load while maintaining uninterrupted power to the load with the first battery during a period of time in which the second battery switch is switched to isolate the second battery from the load.

3. The system of claim 1 , wherein the first battery switch is coupled to positive and negative terminals of the first battery.

4. The system of claim 1 , wherein the first battery switch comprises a relay.

5. The system of claim 1 , further comprising a first control unit that monitors at least one cell of the first battery to determine the fault with the first battery.

6. The system of claim 1 , wherein the attribute of the first battery comprises one or more of voltage, temperature, current, isolation resistance, vibration, flex, detachment, internal pressure, or arcing.

7. The system of claim 1 , wherein the main controller is physically isolated from the first battery.

8. The system of claim 2 , wherein the first battery sensor comprises one or more mirrors on the first battery, a light source, and a photosensor.

9. The system of claim 1 , wherein the main controller further comprises a data output and, thereon, provides a data signal based on the indicated fault.

10. The system of claim 1 , wherein the load comprises:
a motor that provides locomotion to a vehicle; and
a computer that provides operational signals for operation of the vehicle.

11. A system, comprising:
a main controller that:
generates and sends, upon determining that first sensor data from a first battery sensor monitoring a first attribute of a first battery indicates a fault with the first battery, a first control signal to a first battery switch to isolate the first battery from a load while maintaining interrupted power to the load with a second battery during a period of time in which the first battery switch is switched to isolate the first battery from the load, the second battery being connected in parallel with the first battery; and
generates and sends, upon determining that second sensor data from a second battery sensor monitoring a second attribute of a second battery indicates a fault with the second battery, a second control signal to a second battery switch to isolate the second battery from the load while maintaining uninterrupted power to the load with the first battery during a period of time in which the second battery switch is switched to isolate the second battery from the load.

12. The system of claim 11 , further comprising:
a first control unit that monitors a third attribute of the first battery; and
a second control unit that monitors a fourth attribute of the second battery.

13. The system of claim 12 , wherein the third attribute is a different type of attribute than the first attribute, and wherein the fourth attribute is a different type of attribute than the second attribute.

14. The system of claim 12 , wherein the third attribute is an internal attribute of the first battery, and wherein the fourth attribute is an internal attribute of the second battery.

15. The system of claim 14 , wherein the third attribute and the fourth attribute are a same type of attribute.

16. The system of claim 14 , wherein the first attribute is an external attribute of the first battery, and wherein the second attribute is an external attribute of the second battery.

17. The system of claim 14 , wherein the third attribute is an attribute of at least one cell of the first battery, and the fourth attribute is an attribute of at least one cell of the second battery.

18. A method, comprising:
monitoring an attribute of a first battery coupled to a load; and
generating and sending, upon determining that the monitored attribute of the first battery indicates a fault with the first battery, a first control signal to a first battery switch to isolate the first battery from the load while maintaining uninterrupted power to the load with a second battery during a period of time in which the first battery switch is switched to isolate the first battery from the load, the second battery being connected in parallel with the first battery.

19. The method of claim 18 , further comprising:
monitoring an attribute of a second battery coupled to the load; and
generating and sending, upon determining that the monitored attribute of the second battery indicates a fault with the second battery, a second control signal to a second battery switch to isolate the second battery from the load while maintaining uninterrupted power to the load with the first battery during a period of time in which the second battery switch is switched to isolate the second battery from the load.

20. The method of claim 18 , wherein the attribute of the first battery comprises one or more of voltage, temperature, current, isolation resistance, vibration, flex, detachment, internal pressure, or arcing.

Assignees

• Nio Technology Anhui Co Ltd

Inventors

• Newman Austin L
• Smith Alexander J
• Ing Adam H
• Rajaie Rick

Classifications

• H02J2105/37

  exchanging power with electric vehicles [EV] or with hybrid electric vehicles [HEV] · CPC title

• H02J7/585

  Sequential battery discharge in systems with a plurality of batteries · CPC title

• H02J7/933

  the cycle being controlled or terminated in response to electric parameters · CPC title

• H02J7/865

  Battery or charger load switching, e.g. concurrent charging and load supply (H02J7/50 takes precedence) · CPC title

• H02J7/50

  acting upon multiple batteries simultaneously or sequentially · CPC title