Granted Patent B2

US 12,455,321 · App. 18/244,620 · Granted Oct 28, 2025

Inventor: Moritz Eitler (Stuttgart, DE)

Assignee: Dr. Ing. h. c. F. Porsche AG

G01R31/388B60L58/12B60L58/16G01R31/392G01R31/367

Abstract

Claims (24)

1. A method for determining a capacity of a traction battery, comprising the following steps:

initiating and/or waiting a predetermined time period during which a battery current is below a threshold amount;

selecting an OCV characteristic curve from a group of OCV characteristic curves ( 31 - 33 , 41 - 43 ) based on at least first and second parameters (P 1 , P 2 , . . . Pn), wherein at least the first parameter (P 1 ) describes a cell characteristic of battery cells used in the traction battery, and at least the second parameter (P 2 ) describes an operating parameter of the traction battery prior to the predetermined time period and/or during the predetermined time period and equals or is correlated to a charging power during a completed charging operation;

determining an open circuit voltage of the traction battery after the predetermined time period has elapsed; and

determining the capacity of the battery based on the selected OCV characteristic curve.

2. The method of claim 1 ,

wherein the threshold equals zero.

3. The method of claim 1 ,

wherein, during the time period, a direction of the current flow remains the same, provided it is different from zero.

4. The method of claim 1 ,

wherein the first parameter (P 1 ) equals or is correlated to a characteristic value indicative of an aging state of the traction battery.

5. The method of claim 1 wherein,

the group of OCV characteristic curves ( 31 - 33 , 41 - 43 ) comprises experimentally determined or simulated OCV characteristic curves.

6. A control device for a traction battery of a vehicle configured to determine the capacity of the traction battery according to the method of claim 1 .

7. A method for determining a capacity of a traction battery, comprising the following steps:

initiating and/or waiting a predetermined time period during which a battery current is below a threshold amount;

selecting an OCV characteristic curve from a group of OCV characteristic curves ( 31 - 33 , 41 - 43 ) based on at least first and second parameters (P 1 , P 2 . . . Pn), wherein at least the first parameter (P 1 ) describes a cell characteristic of battery cells used in the traction battery, and at least the second parameter (P 2 ) describes an operating parameter of the traction battery prior to the predetermined time period and/or during the predetermined time period, wherein the second parameter (P 2 ) has a value that is correlated to or equals an integral of the battery power flow;

determining an open circuit voltage of the traction battery after the predetermined time period has elapsed; and

determining the capacity of the battery based on the selected OCV characteristic curve.

8. A method for determining a capacity of a traction battery, comprising the following steps:

initiating and/or waiting a predetermined time period during which a battery current is below a threshold amount;

selecting an OCV characteristic curve from a group of OCV characteristic curves ( 31 - 33 , 41 - 43 ) based on at least first and second parameters (P 1 , P 2 , . . . Pn), wherein at least the first parameter (P 1 ) describes a cell characteristic of battery cells used in the traction battery, and at least the second parameter (P 2 ) describes an operating parameter of the traction battery prior to the predetermined time period and/or during the predetermined time period, wherein the second parameter (P 2 ) has a value that is correlated to or equals the predetermined time period;

determining an open circuit voltage of the traction battery after the predetermined time period has elapsed; and

determining the capacity of the battery based on the selected OCV characteristic curve.

Assignments (1)

Priority Claims (1)

Continuity (2)

References Cited (12)