Abstract: The invention relates to a method for ascertaining an insulation resistance (2) of a test object (3) to be examined, wherein a decoupling capacitor (4) having a first capacity, and a measuring capacitor (5) having a second capacity are connected in series with the test object (3) in such a way that the decoupling capacitor (4) and the measuring capacitor (5) form a low-pass with the insulation resistance (2) of the test object (3), wherein a predetermined voltage (9) is applied to the series connection, the measuring capacitor voltage (8) declining on the measuring capacitor (5) is ascertained, and, by means of an evaluation unit (7), considering the first capacity, the second capacity and the ascertained measuring capacitor voltage (8), the insulation resistance (2) of the test object (3) is determined.

Abstract: The disclosure relates to a method for state of charge compensation of a battery having a plurality of battery units. The method comprises the steps of calculating a depth of discharge of each battery unit after the battery units have been charged, calculating an available charge of each battery unit before the battery units are charged, calculating a state of charge compensation requirement value on the basis of the calculated depth of discharge and the calculated available charge for each battery unit, and discharging each battery unit on the basis of the calculated state of charge compensation requirement value. The disclosure also relates to a method for charging a battery which has a plurality of battery units. Also specified are a computer program and a battery management system set up to perform the method, and a battery and a motor vehicle having a drive system connected to such a battery.

Abstract: The invention relates to a method for ascertaining an insulation resistance (2) of a test object (3) to be examined, wherein a decoupling capacitor (4) having a first capacity, and a measuring capacitor (5) having a second capacity are connected in series with the test object (3) in such a way that the decoupling capacitor (4) and the measuring capacitor (5) form a low-pass with the insulation resistance (2) of the test object (3), wherein a predetermined voltage (9) is applied to the series connection, the measuring capacitor voltage (8) declining on the measuring capacitor (5) is ascertained, and, by means of an evaluation unit (7), considering the first capacity, the second capacity and the ascertained measuring capacitor voltage (8), the insulation resistance (2) of the test object (3) is determined.

Abstract: A method for reducing a total charge loss of battery cells by equalizing states of charge includes making an initial check as to whether a temperature of at least one balancing unit lies below a preselectable temperature limit. Thereupon a check takes place as to whether a charging process of the battery cells has completed and the state of charge of the battery cells is >90%. A determination then follows as to whether a maximum state of charge difference between battery cells lies above an adjustable limit (DELTA_SoC).

Abstract: A method of use for an electric energy store includes defining a set of states of the electric energy store. The method further includes defining at least one separation surface which separates a first subspace of first states of the electric energy store from at least one second subspace of second states of the electric energy store and detecting at least one influencing factor from the predefinable influencing factors and determining third states of the electric energy store if the electric energy store is used. The method includes estimating at least one state by evaluating at least one influencing factor, checking whether the at least one state is in a predefined subspace for the predefined time and changing use of the electric energy store such that the at least one state is in the predefined subspace at the predefined time based on the check.

Abstract: The disclosure relates to a method for state of charge compensation of a battery having a plurality of battery units. The method comprises the steps of calculating a depth of discharge of each battery unit after the battery units have been charged, calculating an available charge of each battery unit before the battery units are charged, calculating a state of charge compensation requirement value on the basis of the calculated depth of discharge and the calculated available charge for each battery unit, and discharging each battery unit on the basis of the calculated state of charge compensation requirement value. The disclosure also relates to a method for charging a battery which has a plurality of battery units. Also specified are a computer program and a battery management system set up to perform the method, and a battery and a motor vehicle having a drive system connected to such a battery.

Abstract: A method for reducing a total charge loss of battery cells by equalizing states of charge includes making an initial check as to whether a temperature of at least one balancing unit lies below a preselectable temperature limit. Thereupon a check takes place as to whether a charging process of the battery cells has completed and the state of charge of the battery cells is >90%. A determination then follows as to whether a maximum state of charge difference between battery cells lies above an adjustable limit (DELTA_SoC).