Method and Device for Determining the State of an Electric Energy Storage Device

A device for determining state information with respect to a state of an electrical energy storage device, wherein the electrical energy storage device comprises a first substore and a second substore that, using a switch unit, can be configured in a parallel-connected arrangement, wherein the device is configured to:

• bring about an assumption of a first partial voltage by the first substore, and of a second partial voltage by the second substore, which partial voltages are mutually different;
• determine balancing information with respect to a balancing process between the first substore and the second substore, upon interconnection of the first substore and the second substore in the parallel-connected arrangement;
• and
• determine state information with respect to the state of the electrical energy storage device on a basis of the balancing information.

A device for determining state information with respect to a state of an electrical energy storage device, wherein the electrical energy storage device comprises a first substore and a second substore that, via a switch unit, can be configured in a parallel-connected arrangement, wherein the device is configured to:

• bring about an assumption of a first partial voltage by the first substore, and of a second partial voltage by the second substore, which partial voltages are mutually different;
• determine relaxation information with respect to a relaxation process between the first substore and/or the second substore, further to a separation of the first substore and the second substore;
• and
• determine state information with respect to a state of the electrical energy storage device on a basis of the relaxation information.

A method for determining state information with respect to a state of an electrical energy storage device, wherein the electrical energy storage device comprises a first substore and a second substore which, via a switch unit, can be configured in a parallel-connected arrangement, the method comprising:

• achieving a first partial voltage by the first substore, and a second partial voltage by the second substore, which partial voltages are mutually different;
• ascertaining balancing information with respect to a balancing operation between the first substore and the second substore upon an interconnection of the first substore and the second substore in the parallel-connected arrangement;
• and
• ascertaining state information with respect to a state of the electrical energy storage device on a basis of the balancing information.