Robert Boschgmbh

Samsung Sdi Co., Inc.

Sb Limotive Company Ltd.

Andre Boehm

Stefan Wickert

Jens Becker

Yongjun Tae

Stefan Butzmann

Ralf Angerbauer

Christoph Brochhaus

Christian Korn

Sven Bergmann

Alfons Doerr

Jochen Weber

Michael Rueger

Frank Schindler

Olivier Cois

Armin Steck

Anne Heubner

Thomas Dufaux

Stefan Soboll

Ralf Liedtke

Rainer Kern

Sven Gaebler

Marianne Heizmann

Joachim Rischen

Andres Lemke

A method determines a potential of an anode and/or a potential of a cathode in a battery cell. The method measures a current flowing through the battery cell, determines a charge transfer resistance of the battery cell, ascertains a charge transfer resistance of the anode and a charge transfer resistance of the cathode, ascertains a depth of discharge, ascertains an anode residual voltage and a cathode residual voltage from the depth of discharge from an idle voltage, ascertains an anode excess potential from the charge transfer resistance of the anode and the current and ascertains a cathode excess potential from the charge transfer resistance of the cathode and the current. The method ascertains the potential of the anode from the anode residual voltage and the anode excess potential and ascertains the potential of the cathode from the cathode residual potential and the cathode excess potential.

Method for determining a potential of an anode and/or a potential of a cathode in a battery cell

The present invention relates to a method for minimizing cell aging of a battery () and/or a battery () comprising an apparatus for minimizing cell aging of the battery (). For this the following is performed: detection of battery parameters which describe the present state of the battery (); checking, on the basis of a preset aging model and the battery parameters, whether the state of the battery () is an aging state in which the cell aging of the battery () is less pronounced in the case of cyclic charging or discharging than in a quiescent state in which there is no charging or discharging of the battery (); and cyclic partial discharging and partial charging of the battery () if the battery () is in such an aging state. The method according to the invention and/or the battery () according to the invention are characterized by reduced cell aging. This means that such a battery () and/or a battery () to which the method is applied has an extended life. This results in particular in cost advantages, ecological advantages and improved user friendliness.

Method for minimizing cell aging of a battery and/or battery comprising an apparatus for minimizing cell aging of the battery

The invention relates to a method for operating a battery unit comprising at least two series-connected battery cells, wherein a discharge process of at least one battery cell is carried out via a connectable discharge resistor in order to equalize states of charge of the battery cells. According to the invention, the value of the discharge resistance is ascertained during the discharge process of the at least one battery cell, and the previously ascertained value of the discharge resistance is taken into account during a subsequent discharge process of the battery cell.

Method for operating a battery unit

The present invention relates to a method and to a battery management system which are suitable for determining an open-circuit voltage profile () of a vehicle battery, dependent on a state of charge, in a vehicle. In this context, the following occur: complete discharging (S) of the vehicle battery by vehicle-internal loads of the vehicle, sensing (S) of a first sensed, state-of-charge-dependent voltage profile () during the discharging (S) of the vehicle battery, complete charging (S) of the vehicle battery by a charging device, sensing (S) of a second sensed state-of-charge-dependent voltage profile () during the charging (S) of the vehicle battery, and determination (S) of the state-of-charge-dependent open-circuit voltage profile () by means of a weighted interpolation of the first sensed voltage profile () and of the second sensed voltage profile ().

Method and device for determining an open-circuit voltage profile of a vehicle battery, dependent on a state of charge

The disclosure relates to a method for balancing out states of charge of a battery which has a number of N battery cells. In order to balance out the individual states of charge (SOCn) of the n=1 to N cells, the state of charge of at least one cell is changed to a target state of charge (SOCtarget,n) which depends on the discharge depth (DODk) of the cell having the lowest capacity (Capk) according to the equation SOCtarget,n=1&#x2212;DODk/Capn, Capn being the capacity of the nth cell to be changed. Advantageously, the method is suitable for optimizing the voltage or the energy content of a battery that is constituted of a plurality of cells.

Method for balancing out states of charge of a battery having a plurality of battery cells, and a corresponding battery management system and battery

A method for cell balancing for a plurality of battery cells. Such a method involves the cell balancing being performed on the basis of a need that can be ascertained comparatively accurately. The method described above allows equalization of the states of charge, or cell balancing, based on the state of charge of the battery cells to be made possible, even without knowledge of the capacities of the in particular series-connected battery cells, such that the loss of charge as a result of the cell balancing is particularly low. Hence, a loss of charge as a result of unnecessary equalization of the charge can be prevented or at least significantly reduced.

Method for cell balancing for a plurality of battery cells, and battery system for performing such a method

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.

Method for determining at least one state of a plurality of battery cells, computer program, battery and motor vehicle

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.

Method for estimating an accurate state of charge for initializing a battery management system

The invention relates to a method for determining the capacity of a battery cell. A battery cell current I is measured during a measurement period, and an open terminal voltage U,Uof the battery cell is measured at the beginning and end of the measuring period. The method has the steps of ascertaining a total battery cell current Ifrom the measured battery cell current I, ascertaining charge states SOC, SOCat the beginning and end of the measurement period using the measured open terminal voltage U,U, ascertaining an estimated value of the capacity Qusing the total battery cell current Iand a difference between the charge states SOC, SOC, ascertaining a total measurement error of the estimated value of the capacity Qfrom measurement errors of the total battery cell current Iand the charge states SOC, SOC, and ascertaining a new value of the capacity Qusing a known value of the capacity Q, the estimated value of the capacity Q, and the total measurement error. The new value of the capacity Qis in a monotonic relationship with the known value of the capacity Qand the estimated value of the capacity Qsuch that the new value of the capacity Qis determined more strongly from the estimated value of the capacity Qin the case of at least one first value of the total measurement error than in the case of at least one second value of the total measurement error, said second value lying above the at least one first value, and the new value of the capacity Qis determined less strongly from the known value of the capacity Qin the case of the first value of the value of the total measurement error than in the case of the second value of the total measurement error. The invention further relates to a computer program, a battery management system (), and a motor vehicle which are designed to carry out the method.

Method for determining the capacity of a battery cell

The disclosure relates to a method for ascertaining permissible operating parameters of a battery. For this purpose, operating parameters of the battery are measured, and further relevant operating parameters of the battery are determined from the measured operating parameters. Furthermore, at least one of the determined operating parameters is compared with a predefined comparison range. If the at least one operating parameter lies within the predefined comparison range, the permissible operating range of the at least one operating parameter is determined using a mathematical model of the battery. However, if the at least one battery parameter lies outside the predefined comparison range, the permissible operating range of the at least one operating parameter is determined using previously stored battery data.

Method for ascertaining operating parameters of a battery, battery management system, and battery

A method for enhancing a battery management system for determining at least one limit value for a first characteristic variable of a battery. The method includes measuring different values of a further characteristic variable for predetermined values of the first characteristic variable in order to determine limit values of the further characteristic variable for charging and/or discharging the battery for the predetermined values of the first characteristic variable, with the result that battery discharging or charging corresponding to the limit values does not result in a battery voltage outside a permissible battery voltage range if the battery has that predetermined value of the characteristic variable which is associated with the respective limit value. The method further includes determining charging and/or discharging limit values of the characteristic variable for predetermined values of the further characteristic variable using the determined charging and/or discharging limit values.

Method for enhancing a battery management system, battery management system, battery system and motor vehicle

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.

Device and method for the redundant determination of a battery current flowing through the poles of a battery

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.

State of charge determination for an electrical accumulator

The disclosure describes a method for checking the proper method of operation of a current sensor which is designed to measure a battery current. During a precharge phase which begins at a time at which at least one electrical component is connected to a battery and during which the electrical component is precharged by a precharge current, at least one measured value provided by the current sensor is compared with an expected current value determined from an expected temporal profile of the precharge current. The disclosure also describes a computation unit and a battery which are designed to carry out the method according to the disclosure.

Method for checking the proper method of operating of a current sensor

A method for reducing a total loss of charge of battery cells by balancing states of charge includes checking boundary conditions as to whether a vehicle is in the park mode, whether a previous balancing step occurred in the past by at least a defined time period, whether a temperature of a balancing unit lies below an adjustable temperature limit and whether states of charge of all battery cells exceed a minimum state of charge. Additionally, the method includes determining a need for balancing such that a check is made as to whether a maximum difference of all states of charge of all battery cells is greater than an adjustable limit state of charge. Also the method includes, balancing by the balancing units if the first two steps of the method are affirmed. The balancing resistances are connected to respective battery cells for a predetermined time.

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Kornwestheim, Germany

Andre Boehm