Abstract: The present invention relates to a method for operating a battery, which includes determining the cell voltage of at least one battery cell, determining the associated cell pack voltage of the at least one battery cell, and evaluating the cell voltage and the cell pack voltage by means of an analysis program on a microprocessor in a main control unit, where an overheating warning message is triggered if, within a defined measurement period, the cell voltage decreases by a defined cell error value and the cell pack voltage decreases by a defined pack error value.

Abstract: The present invention relates to a battery, in the form of a high-voltage battery (HV battery), comprising at least the following battery elements: a cell compartment with a plurality of cell modules and associated cell measurement boards, a main control unit with a main board, a main microprocessor and a plurality of microelectronic/electronic elements, a switch box comprising two contactors for a positive HV line and a negative HV line, where a pressure sensor is provided for measuring pressure in the battery interior, and this pressure sensor is arranged outside the main board at one of the following locations: in the switch box, on a central secondary board, and/or on at least one cell measurement board.

Abstract: The present invention relates to a method for determining a proportion of defective battery cells in a group of battery cells connected electrically in parallel in a battery, where a voltage state of a terminal voltage of the group is determined in relation to a charging process and/or in relation to a relaxation of the battery under an environmental condition and a deviation of the determined voltage state of the terminal voltage from the voltage state of the terminal voltage of the same group from a previous charging process and/or a previous relaxation under the same environmental condition is calculated, where the proportion of defective battery cells in the group is determined from the calculated deviation.