Systems and methods for monitoring a state of health of a battery system of an electric vehicle

Patent metadata

Field	Value
Publication number	US-2025164569-A1
Application number	US-202318510770-A
Country	US
Kind code	A1
Filing date	Nov 16, 2023
Priority date	Nov 16, 2023
Publication date	May 22, 2025
Grant date	—

Abstract

Methods and systems are provided for monitoring a state of health (SOH) of a battery system of an electric vehicle (EV). A projected SOH value of the battery system at one of a future vehicle age and a future total EV mileage is generated. The projected SOH value is based in part on a current SOH value and historical SOH values associated with use of the battery system to supply power to at least one of an offboard vehicle load and an onboard accessory load. A determination is made regarding whether the projected SOH value is less than a SOH threshold at the one of the future vehicle age and the future total EV mileage. A customer SOH alert regarding use of the battery system to supply power to the at least one of the offboard vehicle load and the onboard accessory load is generated based on the determination.

First claim

What is claimed is:

1 . A battery system state of health (SOH) monitoring system for an electric vehicle (EV) comprising:
at least one processor; and at least one memory communicatively coupled to the at least one processor, the at least one memory comprising instructions that upon execution by the at least one processor, cause the at least one processor to:
generate a projected SOH value of a battery system of the EV at one of a future vehicle age and a future total EV mileage, wherein:
the projected SOH value of the battery system is based on a current SOH value of the battery system and historical SOH values of the battery system;
the current SOH value of the battery system and the historical SOH values of the battery system are based at least in part on use of the battery system to supply power to at least one of an offboard vehicle load and an onboard accessory load;

determine whether the projected SOH value of the battery system is less than a SOH threshold at the one of the future vehicle age and the future total EV mileage; and
generate a customer SOH alert associated with limitations in connection with the use of the battery system to supply power to the at least one of the offboard vehicle load and the onboard accessory load for display on a display device of the EV based on the determination.

2 . The system of claim 1 , wherein the SOH threshold is a first SOH threshold value and the at least one memory comprises further instructions that upon execution by the at least one processor, cause the at least one processor to:
based on a determination that the projected SOH value of the battery system is less than the first SOH threshold value:
disable an ability of the battery system to supply power to all of the at least one of the offboard vehicle load and the onboard accessory load; and
generate the customer SOH alert, the customer SOH alert comprising a first notification that the ability of battery system to supply power to all of the at least one of the offboard vehicle load and the onboard accessory load has been disabled.

3 . The system of claim 2 , wherein the SOH threshold comprises a first SOH threshold range between the first SOH threshold value and a second SOH threshold value, the second SOH threshold value being greater than the first SOH threshold value; and
based on a determination that the projected SOH value of the battery system falls within the first SOH threshold range, the at least one memory comprises further instructions that upon execution by the at least one processor, cause the at least one processor to:
limit an amount of power that can be supplied by the battery system to a first subset of the at least one of the offboard vehicle load and the onboard accessory load;
disable an ability of the battery system to supply power to a second subset of the at least one of the offboard vehicle load and the onboard accessory load; and
generate the customer SOH alert, the customer SOH alert comprising a second notification that the amount of power that can be supplied by the battery system to the first subset of the at least one of the offboard vehicle load and the onboard accessory load has been limited and that the ability of the battery system to supply power to a second subset of the at least one of the offboard vehicle load and the onboard accessory load has been disabled.

4 . The system of claim 3 , wherein:
the SOH threshold comprises a second SOH threshold range between the second SOH threshold value and a third SOH threshold value, the third SOH threshold value being greater than the second SOH threshold value; and based on a determination that the projected SOH value of the battery system falls within the second SOH threshold range, the at least one memory comprises further instructions that upon execution by the at least one processor, cause the at least one processor to
recommend limiting use of the battery system to supply power to the at least one of the offboard vehicle load and the onboard accessory load;
limit an amount of power that can be supplied by the battery system to a third subset of the at least one of the offboard vehicle load and the onboard accessory load; and
generate the customer SOH alert, the customer SOH alert comprising a third notification to recommend limiting use of the battery system to supply power to the at least one of the offboard vehicle load and the onboard accessory load and that the amount of power that can be supplied to the third subset of the at least one of the offboard vehicle load and the onboard accessory load has been limited.

5 . The system of claim 4 , wherein:
the SOH threshold comprises a third SOH threshold range between the third SOH threshold value and a fourth SOH threshold value, the fourth SOH threshold value being greater than the third SOH threshold value; and based on a determination that the projected SOH value of the battery system falls within the third SOH threshold range, the at least one memory comprises further instructions that upon execution by the at least one processor, cause the at least one processor to generate the customer SOH alert, the customer SOH alert comprising a fourth notification to recommend limiting use of the battery system to supply power to the at least one of the offboard vehicle load and the onboard accessory load.

6 . The system of claim 1 , wherein the at least one memory comprises further instructions that upon execution by the at least one processor, cause the at least one processor to:
generate the projected SOH value of the battery system at the future vehicle age, wherein the projected SOH value of the battery system is based on the current SOH value of the battery system and historical SOH values of the battery system during corresponding historical vehicle ages; and determine whether the projected SOH value of the battery system is less than the SOH threshold at the future vehicle age.

7 . The system of claim 6 , wherein the at least one memory comprises further instructions that upon execution by the at least one processor, cause the at least one processor to generate the projected SOH value of the battery system at the future vehicle age, wherein the projected SOH value of the battery system is based on the current SOH value of the battery system and the historical SOH values of the battery system during the corresponding historical vehicle ages within a pre-defined vehicle age window.

8 . The system of claim 1 , wherein the future vehicle age is a vehicle age warranty.

9 . The system of claim 1 , wherein the at least one memory comprises further instructions that upon execution by the at least one processor, cause the at least one processor to:
generate the projected SOH value of the battery system at the future total EV mileage, wherein:
the projected SOH value of the battery system is based on the current SOH value of the battery system at a current total EV mileage and historical SOH values of the battery system during corresponding historical total EV mileages;
each total EV mileage is a sum of a driven EV mileage and a virtual EV mileage; and
each virtual EV mileage is based on the use of the battery system to supply power to the at least one of the offboard vehicle load and the onboard accessory load; and
determine whether the projected SOH value of the battery system is less than the SOH threshold at the future total EV mileage.

10 . The system of claim 9 , wherein the at least one memory comprises further instructions that upon execution by the at least one processor, cause the at least one processor to generate the projected SOH value of the battery system at the future total EV mileage, wherein the projected SOH value of

Assignees

• Gm Global Tech Operations Llc

Inventors

• Bunnell Justin
• Zhang Yanyan
• Zettel Andrew M
• Shounia Ziad
• Peer Shanshan Li
• Nicholson James
• Moulliet Ryan B

Classifications

• B60K35/00

  Instruments specially adapted for vehicles; Arrangement of instruments in or on vehicles · CPC title

• B60L3/12

  Recording operating variables {; Monitoring of operating variables} · CPC title

• B60L3/0046 Primary

  relating to electric energy storage systems, e.g. batteries or capacitors · CPC title

• B60L2240/547

  Voltage · CPC title

• B60L2240/549

  Current · CPC title