A method detects electrical fault states of a removable battery pack and/or an electrical device, in particular a charging device, a diagnostic device or an electrical consumer, that can be connected to the removable battery pack, using a first monitoring unit integrated in the removable battery pack. The method includes measuring a charging or discharge current using a first current measuring apparatus integrated in the electrical device and transmitting the measured current directly or as a converted voltage value to the first monitoring unit of the removable battery pack, and determining, using the first monitoring unit, based on the charging or discharge current and/or the voltage value calculated therefrom, whether the removable battery pack is operating in a permissible operating range.

A method detects electrical fault states of a removable battery pack and/or an electrical device, in particular a charging device, a diagnostic device or an electrical consumer, that can be connected to the removable battery pack, using a first monitoring unit integrated in the removable battery pack. The method includes measuring a charging or discharge current using a first current measuring apparatus integrated in the electrical device and transmitting the measured current directly or as a converted voltage value to the first monitoring unit of the removable battery pack, and determining, using the first monitoring unit, based on the charging or discharge current and/or the voltage value calculated therefrom, whether the removable battery pack is operating in a permissible operating range.

A method for determining an ageing function of an accumulator, the ageing function representing a variation in the capacity or resistance of the accumulator, as a function of variables representative of the operation of the accumulator, the method including carrying out a plurality of experimental cycles of charging and discharging a test accumulator, each cycle being parameterised by accumulator operating parameters that vary as a function of time during the various cycles; b) during experimental cycles, determining experimental data, including a value of each variable parameter, and determining the capacity or the resistance; c) on the basis of the experimental data resulting from b), determining the ageing function of the accumulator; wherein in step a), the variable parameters include the state of charge and a depth of discharge, such that, following step c), the variables of the ageing function with the state of charge and the depth of discharge.

A method for determining an ageing function of an accumulator, the ageing function representing a variation in the capacity or resistance of the accumulator, as a function of variables representative of the operation of the accumulator, the method including carrying out a plurality of experimental cycles of charging and discharging a test accumulator, each cycle being parameterised by accumulator operating parameters that vary as a function of time during the various cycles; b) during experimental cycles, determining experimental data, including a value of each variable parameter, and determining the capacity or the resistance; c) on the basis of the experimental data resulting from b), determining the ageing function of the accumulator; wherein in step a), the variable parameters include the state of charge and a depth of discharge, such that, following step c), the variables of the ageing function with the state of charge and the depth of discharge.

A method for monitoring an energy store in an on-board electrical system of a motor vehicle. At least one instantaneous parameter of the energy store is determined, and this at least one parameter is forwarded to a forecast model. The forecast model determines future values for the at least one parameter from the instantaneous value for the at least one parameter. The future value of the at least one parameter is provided to a voltage predictor which calculates a minimum voltage of the energy store to be expected for a selected function.

A method for monitoring an energy store in an on-board electrical system of a motor vehicle. At least one instantaneous parameter of the energy store is determined, and this at least one parameter is forwarded to a forecast model. The forecast model determines future values for the at least one parameter from the instantaneous value for the at least one parameter. The future value of the at least one parameter is provided to a voltage predictor which calculates a minimum voltage of the energy store to be expected for a selected function.

A method of predicting the lifetime of a battery and an apparatus for performing the method can include collecting, by a battery information collection unit, information on the battery, generating, by a first battery value determination unit, first battery value data, generating, by a second battery value determination unit, second battery value data and determining, by a battery value determination unit, a battery value based on the first battery value data and the second battery value data. The first battery value data is a value of the battery, which is determined based on a battery diagnostic test, and the second battery value data is a value of the battery, which is determined based on vehicle data.

A method of predicting the lifetime of a battery and an apparatus for performing the method can include collecting, by a battery information collection unit, information on the battery, generating, by a first battery value determination unit, first battery value data, generating, by a second battery value determination unit, second battery value data and determining, by a battery value determination unit, a battery value based on the first battery value data and the second battery value data. The first battery value data is a value of the battery, which is determined based on a battery diagnostic test, and the second battery value data is a value of the battery, which is determined based on vehicle data.

Provided are a battery management system (BMS) and a battery system capable of accurately measuring a voltage without using a precise resistance element and reducing an error even when operating in a wide temperature range. Since a correction amount for the resistor included in the voltage measurement module is generated using a diagnostic power source configured independently of the battery system, and a voltage of the circuit included in the battery system is measured by applying the generated correction amount, the voltage may be precisely measured without using a high-precision resistance element. Since a changeover switch operates periodically to generate and apply an updated correction amount according to a changing environment, the voltage may be precisely measured even if it is applied to a system in which the environment continuously changes, such as a driving electric vehicle.

Provided are a battery management system (BMS) and a battery system capable of accurately measuring a voltage without using a precise resistance element and reducing an error even when operating in a wide temperature range. Since a correction amount for the resistor included in the voltage measurement module is generated using a diagnostic power source configured independently of the battery system, and a voltage of the circuit included in the battery system is measured by applying the generated correction amount, the voltage may be precisely measured without using a high-precision resistance element. Since a changeover switch operates periodically to generate and apply an updated correction amount according to a changing environment, the voltage may be precisely measured even if it is applied to a system in which the environment continuously changes, such as a driving electric vehicle.