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

Patent metadata

Field	Value
Publication number	US-12481004-B2
Application number	US-202318510770-A
Country	US
Kind code	B2
Filing date	Nov 16, 2023
Priority date	Nov 16, 2023
Publication date	Nov 25, 2025
Grant date	Nov 25, 2025

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; and
the current SOH value of the battery system and the historical SOH values of the battery system are based on use of the battery system to supply power to at least one of an offboard vehicle load and an onboard accessory load; and

based on a determination that the projected SOH value of the battery system is less than a first SOH threshold at the one of the future vehicle age and the future total EV mileage:
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;
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
wherein the customer SOH alert comprises 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.

2 . The system of claim 1 , wherein based on a determination that the projected SOH value of the battery system falls within a first SOH threshold range between the first SOH threshold value and a second SOH threshold value, wherein the second SOH threshold value is greater than the first SOH threshold value, 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 the second subset 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 based on a determination that the projected SOH value of the battery system falls within a second SOH threshold range between the second SOH threshold value and a third SOH threshold value, wherein the third SOH threshold value is greater than the second SOH threshold value, 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.

4 . The system of claim 3 , wherein based on a determination that the projected SOH value of the battery system falls within a third SOH threshold range between the third SOH threshold value and a fourth SOH threshold value, wherein the fourth SOH threshold value is greater than the third SOH threshold value, 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.

5 . 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 first SOH threshold at the future vehicle age.

6 . The system of claim 5 , 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.

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

8 . 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 first SOH threshold at the future total EV mileage.

9 . The system of claim 8 , 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 and the historical SOH values of the battery system during the corresponding historical total EV mileages within a pre-defined total EV mileage window.

10 . The system of claim 1 , wherein the future total EV mileage is a vehicle warranty mileage.

11 . 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:
determine the current battery SOH value of the batte

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

• G01R31/367

  Software therefor, e.g. for battery testing using modelling or look-up tables · CPC title

• G01R31/371

  with remote indication, e.g. on external chargers · CPC title

• B60L58/16

  responding to battery ageing, e.g. to the number of charging cycles or the state of health [SoH] · CPC title

• B60L2240/547

  Voltage · CPC title

• B60L2240/549

  Current · CPC title