Abstract: The present disclosure relates to a method for ascertaining the open circuit voltage (OCV) of a battery, to a battery with a module configured to ascertain the open circuit voltage and to a motor vehicle having a corresponding battery, which is configured to ascertain the ageing-dependent open circuit voltage of battery packs installed in a vehicle. To this end it is proposed to determine the open circuit voltage during the charging operation of the battery. Furthermore proposed are a battery having a module for ascertaining the open circuit voltage of a battery, and a vehicle having a battery of this type.

Abstract: A BMS and driving method, the BMS including a sensing unit sensing voltages and currents of battery cells and an MCU determining an SOC of the battery cells and controlling charging and discharging based on cell voltages and currents of the battery cells, wherein the MCU includes an SOC measurer measuring first SOCs and, after a predetermined duration, second SOCs of the battery cells; and a controller determining whether a first difference value between a maximum second SOC value and the second SOCs of each battery cell is greater than a first reference value or determining whether a second difference value between the first and second SOCs of respective battery cells is greater than a second reference value, and determining which battery cell is shorted when the first difference value is greater than the first reference value or when the second difference value is greater than the second reference value.

Abstract: A device comprises a battery having a multiplicity of battery cells and a sensor system for the redundant determination of a battery current flowing through the poles of the battery. The sensor system comprises a current measuring device for detecting the battery current and providing a current measurement value. Furthermore, the device comprises a voltage measuring device for separately detecting a variation with time of the single-cell voltage of at least one battery cell and providing at least one variation with time of a voltage measurement value. Furthermore, the device comprises an evaluating unit which is configured for determining the battery current from the at least one variation with time of the voltage measurement value, providing a corresponding current value and comparing the current value with the current measurement value.

Abstract: A method for determining the life expectancy of at least one battery cell, according to which a value of at least one physical variable acting on the battery cell and/or a number of executions of at least one process taking place in the battery cell is determined, and the value of the physical variable and/or the number of executions of processes is used as a basis for determining the life expectancy. The physical variable and/or the number of executions of processes taking place in the battery cell is determined for a plurality of operating cycles, and the frequency of the occurrence of defined values of the physical variable and/or the frequency of the number of executions of at least one defined process is stored.

Abstract: A method for monitoring the conditions of driving systems can be used in particular to control driving systems in hybrid vehicles with particular consideration given to the exhaust emission. The method monitors the conditions of driving systems that comprise an internal combustion engine and an electric motor with an energy source. A first power value for operating the internal combustion engine and a second power value for describing the power that can be provided by the energy source are ascertained, and the first and second power values are compared with each other to monitor the conditions of the driving system. The driving system is controlled dependent on the result of the comparison.

Abstract: The disclosure relates to a method for determining at least one state of a plurality of spatially combined battery cells connected to each other by circuitry. The state is determined by observing battery cells by means of at least one observer structure. A subset of a plurality of battery cells is observed and the state derived from the observation is determined for more battery cells than for the observed battery cells. The disclosure further relates to a battery comprising a battery management system, which is configured such that the method according to the disclosure can be carried out thereby. The disclosure also relates to a motor vehicle comprising a battery according to the disclosure.

Abstract: A method for determining the power that can be provided or absorbed by a battery includes determining a state variable of the battery. A power that can be provided or absorbed by the battery during a specified load period is determined using a table of power values and the state variable of the battery. The state variable of the battery is used as an access parameter for the table. A load of the battery is measured using an operating parameter of the battery. A load period in which the load of the battery is given is measured. The measured load period is compared with a comparison range that contains the specified load period. A correction routine is carried out if the load period lies in the comparison range. A battery system includes a controller for carrying out the method. A motor vehicle includes the battery system.

Abstract: A method for balancing states of charge of battery cells of a battery includes determining the individual cell capacities of the cells. A k-th cell having the smallest cell capacity, the individual states of charge, the depth of discharge, a target depth of discharge, and a target state of charge are determined. The deviation of the state of charge of a cell from the target state of charge (?SOCtarget,n) and the minimum deviation of the state of charge of a cell from the target state of charge (?SOCmin) are determined. At least one of the cells, to which ?SOCtarget,n??SOCmin>X applies, where X?0, is discharged. If ?SOCtarget,n??SOCmin?X applies to all cells, the method ends. If this condition does not apply to all cells, the individual states of charge are determined again and the method is repeated.

Abstract: A battery management system and a driving method thereof are disclosed, which may detect a short battery cell capable of causing short among a plurality of battery cells during a parking period of a vehicle. The battery management system includes a sensing unit for measuring a cell voltage and a cell current of each of a plurality of battery cells and an MCU for measuring an SOC of each of the battery cells to control charge and discharge by utilizing the cell voltage and the cell current of each of the battery cells. The MCU measures a first SOC of each of the battery cells in a key-off state and a second SOC of each of the battery cells in a key-on state after the key-off state. The MCU utilizes the first SOC, the second SOC, and a time period between the first and second SOCs to determine a short battery cell among the plurality of battery cells.

Abstract: A method for determining the charge state of a battery pack consisting of a number “N” of individual battery cells, includes determining the charge state of each individual battery cell SOCi for all i=1,N. The mean value of the charge states of the individual battery cells, mean (SOCi), is also determined. The method further includes determining a weighting “w” from the equation where w=gw(mean(SOCi)). The following applies for the function gw(SOC): the function value tends towards a minimum value of wmin when the argument tends toward the minimum charge state of a complete discharge SOCmin. The function value tends toward a maximum value of wmax when the argument tends towards the maximum charge state of a complete charge SOCmax; and the function gw( )is continuous.

Abstract: A method for error-compensated current measurement of an electrical accumulator, including: providing a time window-related estimated charge ascertained by a model-based estimator from operating variables of the accumulator and reflecting the estimated charge that has been withdrawn from the accumulator and supplied to the accumulator within the time window; and detecting the accumulator current supplied to the accumulator and withdrawn from the accumulator during the time window, with a current detection sensor. A zero crossing point in time (estimated charge is essentially zero) and a maximum point in time (the absolute value of the estimated charge essentially has a relative maximum or has a value which is greater than a minimum charge difference) are detected. A current measurement offset error is ascertained at the zero crossing point in time by comparing the estimated charge to the detected accumulator current.

Abstract: A method for initializing and operating a battery management system is disclosed. The method comprises the following steps. First, start the battery management system. Next, read battery variables which are stored in a nonvolatile memory of the battery and comprise the last state of charge of the battery. Then measure the open-circuit voltage of the battery. Next, determine an instantaneous state of charge value on the basis of the measured open-circuit voltage. Then determine an estimated value of the state of charge of the battery as a function of both the stored last state of charge of the battery and the instantaneous state of charge value. Then initialize the state of charge in the battery management system using the determined estimated value of the state of charge. Finally, operate the battery management system with the initialized values.

Abstract: A method for ascertaining the maximum power obtainable from a traction storage-battery system that includes a plurality of storage-battery elements connected in series. The method provides for: determining at least one power indicator for each storage-battery element, as well as ascertaining a quantity of the smallest power indicators of all determined power indicators of all storage-battery elements. The quantity includes the smallest power indicator or a subgroup of the smallest power indicators of all power indicators of the storage-battery elements. A power-output limit for the quantity is provided, starting from the power indicators of the quantity.

Abstract: A battery management system and a driving method thereof are provided for detecting a short battery cell. The battery management system includes a main control unit (MCU) and a cell balancing unit. The MCU transmits a battery cell control signal for controlling charge and discharge of the battery cells. The cell balancing unit balances the battery cells according to the battery cell control signal. The MCU includes a cell balancing discharge amount measurement unit and a controller. The cell balancing discharge amount measurement unit measures a cell balancing discharge amount of each of the battery cells. The controller compares a difference value between a maximum value among the cell balancing discharge amounts of the battery cells and each of the cell balancing discharge amounts to determine a short battery cell.

Abstract: In a method for determining the state of charge of an electrical accumulator, individual cell voltages are recorded, and the highest and/or the lowest individual cell voltage is ascertained. A present maximum charge and/or a present minimum charge of the appertaining accumulator cell is determined using a characteristic curve and the highest and/or the lowest individual cell voltage.

Abstract: A battery management system and a driving method thereof are disclosed, which may detect a short battery cell capable of causing short among a plurality of battery cells during a parking period of a vehicle. The battery management system includes a sensing unit for measuring a cell voltage and a cell current of each of a plurality of battery cells and an MCU for measuring an SOC of each of the battery cells to control charge and discharge by utilizing the cell voltage and the cell current of each of the battery cells. The MCU measures a first SOC of each of the battery cells in a key-off state and a second SOC of each of the battery cells in a key-on state after the key-off state. The MCU utilizes the first SOC, the second SOC, and a time period between the first and second SOCs to determine a short battery cell among the plurality of battery cells.

Abstract: A battery management system and a driving method thereof are provided for detecting a short battery cell. The battery management system includes a main control unit (MCU) and a cell balancing unit. The MCU transmits a battery cell control signal for controlling charge and discharge of the battery cells. The cell balancing unit balances the battery cells according to the battery cell control signal. The MCU includes a cell balancing discharge amount measurement unit and a controller. The cell balancing discharge amount measurement unit measures a cell balancing discharge amount of each of the battery cells. The controller compares a difference value between a maximum value among the cell balancing discharge amounts of the battery cells and each of the cell balancing discharge amounts to determine a short battery cell.

Abstract: A BMS and driving method, the BMS including a sensing unit sensing voltages and currents of battery cells and an MCU determining an SOC of the battery cells and controlling charging and discharging based on cell voltages and currents of the battery cells, wherein the MCU includes an SOC measurer measuring first SOCs and, after a predetermined duration, second SOCs of the battery cells; and a controller determining whether a first difference value between a maximum second SOC value and the second SOCs of each battery cell is greater than a first reference value or determining whether a second difference value between the first and second SOCs of respective battery cells is greater than a second reference value, and determining which battery cell is shorted when the first difference value is greater than the first reference value or when the second difference value is greater than the second reference value.