US 12,455,321 B2
Method for determining a capacity of an HV battery
Moritz Eitler, Stuttgart (DE)
Assigned to Dr. Ing. h. c. F. Porsche AG, Stuttgart (DE)
Filed by Dr. Ing. h.c. F. Porsche Aktiengesellschaft, Stuttgart (DE)
Filed on Sep. 11, 2023, as Appl. No. 18/244,620.
Claims priority of application No. 10 2022 127 414.4 (DE), filed on Oct. 19, 2022.
Prior Publication US 2024/0133964 A1, Apr. 25, 2024
Prior Publication US 2024/0230774 A9, Jul. 11, 2024
Int. Cl. G01R 31/388 (2019.01); B60L 58/12 (2019.01); B60L 58/16 (2019.01); G01R 31/392 (2019.01); G01R 31/367 (2019.01)
CPC G01R 31/388 (2019.01) [B60L 58/12 (2019.02); B60L 58/16 (2019.02); G01R 31/392 (2019.01); G01R 31/367 (2019.01)] 8 Claims
OG exemplary drawing
 
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 (P1, P2, . . . Pn), wherein at least the first parameter (P1) describes a cell characteristic of battery cells used in the traction battery, and at least the second parameter (P2) 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.