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.

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.