Method for setting up a vehicle battery and battery management system for a vehicle battery of a motor vehicle

Abstract

The invention relates to a method for setting up a vehicle battery with a plurality of battery cells, a cell contacting system by means of which the battery cells are interconnected to form a battery cell complex comprising a plurality of battery cell assemblies connected in series and / or in parallel, and a battery management system configured to control energy input into and energy withdrawal from the battery cells by means of at least one control command, wherein in the method at least one battery cell measurement value is determined for each battery cell before assembly of the battery cell complex and the battery cell measurement values ​​are stored in the battery management system (V1), and at least one battery cell assembly measurement value is determined for each battery cell assembly and stored in the battery management system (V2).at least one battery cell complex measurement value is determined and stored in the battery management system (V3), and at least one control rule of the battery management system is adapted depending on the determined battery cell measurements, the determined battery cell composite measurements and the at least one determined battery cell complex measurement value (V4).

Description

[0001] The invention relates to a method for setting up a vehicle battery and a battery management system for a vehicle battery of a motor vehicle.

[0002] From EP 3 127 208 B1, a battery management system for monitoring the battery functionality of a battery system comprising a battery with multiple battery cells is known. The battery cells are grouped into battery modules, and each battery module has a state-of-charge balancing system. The battery management system includes several sensor control units assigned to the battery modules, as well as a main control unit. The sensor control units and the main control unit communicate with each other via a communication channel. The state-of-charge balancing system has a number of state-of-charge balancing resistors, which are activated by the sensor control units to balance the state of charge of the battery cells. Furthermore, DE 10 2024 106 123 B3 discloses a method for assembling a plurality of cells into a battery module, which uses a controller with a processor and tangible, non-volatile memory.Furthermore, DE 10 2023 121 818 A1 discloses an example of a method for manufacturing a battery pack for a vehicle. US 11 575 160 B1 shows a battery storage system consisting of a master battery management system, three or more battery blocks, three or more local battery management systems, three or more optically or magnetically isolated communication systems, and a wire arrangement. Another example of a method for managing a battery is disclosed in EP 3 127 208 B1.The battery has several battery cells and is equipped with a battery management system for monitoring battery functionality and with a state-of-charge balancing system, wherein the battery management system comprises several sensor control units and a main control unit which are interconnected via a communication channel, and wherein the state-of-charge balancing system has a number of state-of-charge balancing resistors which are activated via the sensor control units for state-of-charge balancing of the battery cells.

[0003] The object of the present invention is to provide a solution which enables particularly efficient use of a vehicle battery in a motor vehicle.

[0004] This problem is solved according to the invention by the subject matter of the independent claims. Further possible embodiments of the invention are disclosed in the dependent claims, the description, and the figures. Features, advantages, and possible embodiments set forth in the description for one of the subject matter of the independent claims are to be regarded, at least analogously, as features, advantages, and possible embodiments of the respective subject matter of the other independent claims, as well as of any possible combination of the subject matter of the independent claims, optionally in conjunction with one or more of the dependent claims.

[0005] The invention relates to a method for setting up a vehicle battery. The vehicle battery is designed for use in a motor vehicle. In particular, the vehicle battery is designed to provide electrical energy for an electric powertrain of the motor vehicle, enabling the motor vehicle to be electrically driven by means of electrical energy from the vehicle battery. The vehicle battery can, in particular, be a so-called high-voltage battery. The vehicle battery comprises a plurality of battery cells, which can, in particular, be designed as individual cylindrical cells. Additionally, the vehicle battery includes a cell contacting system by means of which the battery cells are interconnected to form a battery cell complex.The battery cell complex comprises a multitude of battery cell assemblies connected in series, in which the individual battery cells are connected in parallel. For example, the battery cells in the battery cell complex can be connected in a so-called 5p configuration using the cell contacting system. This means that five battery cells are connected in parallel to form a battery cell assembly. These battery cell assemblies, each consisting of five parallel-connected battery cells, can in turn be connected in series and / or parallel. Any two interconnected battery cell assemblies are either connected in parallel or in series. In the battery cell complex, at least two battery cell assemblies can be connected in parallel, and at least two battery cell assemblies can be connected in series.The vehicle battery also includes a battery management system, which is designed to control energy input into and output from the battery cells by means of at least one control command. Specifically, the battery management system is a control unit designed to monitor and regulate the battery cells and to implement protective functions for them.

[0006] The method provides that for each battery cell, at least one characteristic battery cell measurement is determined before the battery cell complex is assembled, and that these measurement values ​​are stored in the battery management system and assigned to the corresponding battery cells. The battery cell measurement values ​​characterize the state of the respective battery cells before they are connected to form the battery cell complex. This means that the battery cell measurement values ​​characterize the battery cells before they are connected to the cell contacting system. Furthermore, the method provides that for each battery cell assembly, at least one characteristic battery cell assembly measurement value is determined and stored in the battery management system and assigned to the corresponding battery cell assembly.For example, at least one sensor can be arranged on each pair of battery cell assemblies connected in series or parallel by cell connectors of the cell contacting system. In particular, a sensor is arranged on each pair of cell connectors connecting two battery cell assemblies, enabling the battery cell assembly measurements to be acquired with particularly high precision using the sensors.

[0007] The process further stipulates that at least one battery cell complex value, which characterizes the battery cell complex produced from the battery cells, is determined and stored in the battery management system. Determining the respective measured values ​​does not necessarily mean that the measured values ​​are actually measured within the process. It is possible that the respective measured values, in particular the battery cell values, are determined simply by reading from a memory in which the measured values ​​are stored. The measured values ​​may therefore have already been measured and stored in the memory at an earlier time.The procedure further provides that at least one control rule of the battery management system is adapted based on the determined battery cell measurements, the determined battery cell array measurements, and at least one determined battery cell complex measurement. This control rule is intended to determine how the vehicle battery is controlled during operation. Thus, the procedure provides that the control rule used to control the vehicle battery during operation can be adapted to the battery cells actually installed in the vehicle battery and the respective actual properties of the battery cell arrays of the entire battery cell complex.The vehicle battery is therefore not controlled based on estimated or predetermined nominal values ​​of the battery cells, but rather based on the actual values ​​of the battery cells both before and after their assembly into the battery cell complex. Consequently, this control method allows the vehicle battery to be operated with exceptional efficiency, particularly enabling the delivery of a very high power output, while simultaneously minimizing the risk of damage to the battery cells.

[0008] In a possible further development of the invention, it is provided that, depending on the determined battery cell measurements, the determined battery cell assembly measurements, and the at least one determined battery cell complex measurement, a nominal capacity of the battery cell complex and / or a power output of the battery cell complex are determined and stored in the control code. This means that the vehicle battery can, in turn, be controlled by the control code depending on the particularly precisely determined nominal capacity of the battery cell complex or the particularly precisely determined power output of the battery cell complex. The vehicle battery can thus be controlled particularly well adapted to the individual characteristics of the battery cells or the battery cell complex. The nominal capacity of the battery cell complex indicates the maximum amount of energy that can be stored in the vehicle battery during charging.The nominal capacity can be specified, for example, in ampere-hours or watt-hours. The power output of the battery cell complex is the electrical energy that can be drawn from the battery cell complex within a given time period. Power output is typically expressed in watts and is calculated as the product of discharge current and discharge voltage. Both the nominal capacity and the maximum power output of the battery cell complex can be determined with high precision using the measured values ​​of the individual battery cells, the measured values ​​of the battery cell assembly, and at least one measured value from the battery cell complex. By incorporating these precisely determined nominal capacity and power output values ​​into the control regulations, the battery management system can optimally utilize the nominal capacity and the power output of the battery cell complex when controlling the vehicle battery.

[0009] In a further possible embodiment of the invention, it is provided that a fast-charging characteristic curve and / or charging and / or discharging control parameters for the battery cells, stored in the control rule, are adapted depending on the determined battery cell measurements, the determined battery cell assembly measurements, and the at least one determined battery cell complex measurement. The fast-charging characteristic curve or the charging or discharging control parameters are thus particularly well adapted to the respective properties and conditions of the vehicle battery. Consequently, it is possible to exploit the fast-charging potential of the vehicle battery particularly well when controlling a charging process by means of the control rule.Furthermore, the charging and discharging processes of the vehicle battery cells can be controlled by the control regulation in such a way that, due to the adapted charging or discharging control parameters, the risk of damage to the battery cells, especially to the entire battery cell complex, can be kept particularly low during the respective charging or discharging process.

[0010] In a further possible embodiment of the invention, a power forecast for the battery cell complex, stored in the control regulation, is adapted based on the determined battery cell measurements, the determined battery cell array measurements, and at least one determined battery cell complex measurement. The power forecast can thus predict the power of the battery cell complex with particular precision and accuracy, since it is based not on general nominal values ​​for the battery cells, the battery cell arrays, or the battery cell complex, but on the actual measured values. This enables particularly precise control of the vehicle battery by means of the control regulation, as the power forecast is especially well adapted to the actual characteristics of the vehicle battery.

[0011] In a further possible embodiment of the invention, it is provided that a relationship between an internal resistance or impedance behavior of respective battery cell assemblies and a current and / or state of charge of the respective battery cell assembly and / or a temperature of the respective battery cell assembly is determined and stored in the control regulation. In other words, it is determined how the determined internal resistance or the determined impedance behavior of the respective investigated battery cell assemblies depends on a current applied to the respective battery cell assembly and / or a state of charge prevailing in the respective battery cell assembly and / or a temperature of the respective battery cell assembly.The determined relationships are stored in the control instructions, enabling the battery cell arrays, and consequently the battery cell complex, to be controlled with exceptional precision even under varying temperatures, currents, or charge states. Impedance is the alternating current resistance of electrochemical systems. In other words, to determine the impedance behavior, alternating current is applied to the respective battery cell complex under investigation to ascertain its resistance. This resistance is a function of the frequency of the alternating voltage or current.Based on the determined impedance behavior of the respective battery cell assembly under investigation, further information about the battery cell assembly can be determined, such as its internal resistance and / or its state of charge and / or its state of aging.

[0012] In a further possible embodiment of the invention, a contact resistance is determined for each current-carrying component of the cell contacting system. The cell contacting system comprises, as current-carrying components, at least the cell connectors and terminals that connect the battery cells to one another. At least two terminals are connected to the battery cell complex, through which electrical energy can be supplied to or drawn from the battery cell complex. Depending on the determined contact resistances of the current-carrying components of the cell contacting system, at least one protective function defined in the control rules is adjusted.For example, upon receipt of goods, the respective contact resistance of the current-carrying components of the cell contacting system can be determined, in particular measured, and these determined contact resistances can be stored in the control instructions. Furthermore, the respective contact resistances of the current-carrying components of the cell contacting system can be determined in the installed state of the current-carrying components in the battery cell complex. For this purpose, the sensors arranged on the cell connectors that connect the respective two battery cell assemblies can be used, for example.When measuring the contact resistance of the current-carrying components in the battery cell complex, additional resistances caused by connectors or welded connections, which link the respective cell connectors to the corresponding battery cells, can be determined and stored in the control system. This allows for adjustments to the protective function defined in the control system. For example, the protective function can be adjusted by modifying the current flowing through the battery cell complex during operation. This prevents current-carrying components of the cell contacting system from overheating during operation due to the respective contact resistances or resistances of the welded connections or connectors.

[0013] In a further possible embodiment of the invention, it is provided that an initial state of charge of the battery cell arrays and / or an initial aging state of the capacity of the battery cell arrays and / or an initial aging state of the resistance of the battery cell arrays, as defined in the control regulation, is adjusted at least as a function of the battery cell array measurements. The initial state of charge or the initial aging state of the capacity or the initial aging state of the resistance of the respective battery cell arrays can initially be determined as a function of the battery cell measurements of the respective battery cells belonging to the battery cell array under investigation.Between the time the battery cell measurements are recorded and the installation of the battery cells or the time the battery cell array measurements are recorded, the initial state of charge, the initial state of capacity, or the initial state of resistance of the respective battery cell arrays may have changed. To enable particularly precise control of the vehicle battery based on the actual conditions of the vehicle battery, especially the actual conditions of the battery cell arrays, the initial state of charge and / or the initial state of capacity or resistance stored in the control rules are adjusted for each battery cell array depending on the respective battery cell array measurements that characterize that array.

[0014] In a further possible embodiment of the invention, it is provided that battery cell assemblies for which battery cell assembly measurement values ​​have been determined which lie outside a predetermined standard range and within a predetermined tolerance range are marked in the battery management system, thereby enabling these marked battery cell assemblies to be monitored during operation.In other words, battery cell assemblies or other system components exhibiting conspicuous measured values, whose measured values ​​deviate from predefined, assigned target values ​​or lie outside the assigned predefined standard range, but are still within their allowed variation and thus within the predefined tolerance range, are marked in the battery management system in order to monitor these battery cell assemblies or system components during operation over the lifetime of the vehicle battery using observer structures and data acquisition.

[0015] In a further possible embodiment of the invention, the impedance behavior, voltage behavior, resistance, and / or inductance are determined as measured values. As already explained, the impedance behavior characterizes the AC resistance of electrochemical systems, and thus of battery cells, battery cell arrays, or battery cell complexes, as a function of the frequency of an alternating voltage or alternating current. Based on the determined impedance behavior, characteristic properties of the electrochemical system, and thus of the battery cells, battery cell arrays, or battery cell complexes, can be determined. For example, the open-circuit voltage of the individual battery cells, battery cell arrays, or battery cell complexes can be determined within the context of the voltage behavior.Resistance characterizes, in particular, the internal resistance of the individual battery cells, battery cell groups, or battery cell complex. Based on the determined internal resistance, the usable power of each individual battery cell, battery cell group, or battery cell complex can be calculated. Inductance is a property of electrical components and is based on an interaction between magnetism and electricity. The initial state of charge of the battery cells, battery cell groups, or battery cell complex can be determined from the open-circuit voltage. It is possible for the control instructions to specify the minimum and / or maximum open-circuit voltage values, or the average open-circuit voltage, for all battery cell groups.A difference in the open-circuit voltage between the initial measurement and the measurement after installation in the battery cell complex indicates aging of the battery cells, battery cell arrays, or battery cell complex. This aging can, in turn, be determined by measuring the self-discharge of the battery cells, battery cell arrays, or battery cell complex via the open-circuit voltage. Based on the measured resistance and / or inductance, a performance forecast and / or the performance capacity for the respective battery cell, battery cell array, or battery cell complex can be generated. Furthermore, the age of the respective battery cell, battery cell array, or battery cell complex can be determined from the resistance, as resistance increases with age.The tax regulations may include an estimation function for the aging development of the battery cells, battery cell assemblies, or battery cell complex. This estimation function may incorporate an initial age of the battery cells and / or an initial resistance of the battery cell assemblies and / or a resistance of the battery cell assemblies after their installation in the battery cell complex.

[0016] The more of the described measured values ​​are determined for the battery cells and / or the battery cell arrays and / or the battery cell complex, the better the control regulation can be individually adapted to the vehicle battery.

[0017] The invention further relates to a battery management system for a vehicle battery of a motor vehicle, comprising a plurality of battery cells and a cell contacting system by means of which the battery cells are interconnected to form a battery cell complex. This battery cell complex comprises a plurality of series-connected battery cell assemblies, in which the battery cells are each interconnected in parallel. A control command is stored in the battery management system. The battery management system is configured to control energy input into and output from the battery cells by means of this control command.The control rule is based on determined battery cell measurements characterizing the battery cells before assembly of the battery cell complex, battery cell assembly measurements characterizing the individual battery cell assemblies, and at least one battery cell complex measurement characterizing the battery cell complex. In particular, the control rule has been adapted using a method already described within the framework of the inventive method for setting up a vehicle battery. The control rule is thus particularly well adapted to the individual characteristics of the vehicle battery.

[0018] Further features of the invention may become apparent from the claims, the figures, and the description of the figures. The features and combinations of features mentioned above in the description, as well as the features and combinations of features shown below in the description of the figures and / or in the figures themselves, can be used not only in the combinations specified, but also in other combinations or on their own, without departing from the scope of the invention.

[0019] The drawing shows in the single figure ( Fig. 1) a procedural diagram for a procedure for setting up a vehicle battery.

[0020] In Fig.Figure 1 shows a process diagram for a method for setting up a vehicle battery. The vehicle battery comprises a plurality of battery cells and a cell contacting system by means of which the battery cells are interconnected to form a battery cell complex. The battery cell complex comprises a plurality of series-connected battery cell assemblies, in which the battery cells are connected in parallel. The vehicle battery further comprises a battery management system, which is configured to control energy input into and output from the battery cells by means of at least one control rule.

[0021] The method provides that, in a first process step V1, at least one battery cell measurement value characterizing the respective battery cell is determined, in particular measured, for each battery cell before the battery cell complex is assembled, and the battery cell measurement values ​​are stored in the battery management system and assigned to the corresponding battery cells. In a second process step V2, at least one battery cell assembly measurement value characterizing the battery cell assembly is determined for each battery cell assembly and stored in the battery management system and assigned to the corresponding battery cell assembly. In a third process step V3, at least one battery cell complex measurement value, which characterizes the battery cell complex produced from the battery cells, is determined and stored in the battery management system.Measured values ​​can include, in particular, the impedance behavior and / or the voltage behavior and / or the resistance and / or the inductance of the battery cells or the battery cell arrays or the battery cell complex.

[0022] In a fourth process step V4 of the procedure, it is provided that at least one control rule of the battery management system is adapted depending on the determined battery cell measurements, the determined battery cell assembly measurements, and the at least one battery cell complex measurement. In this way, a nominal capacity of the battery cell complex and / or a power of the battery cell complex can be determined and stored in the control rule, depending on the determined battery cell measurements, the determined battery cell assembly measurements, and the at least one determined battery cell complex measurement.Alternatively or additionally, a fast-charging characteristic curve and / or charging or discharging control parameters for the battery cells, as defined in the control regulations, can be adjusted based on the individual battery cell measurements, the battery cell assembly measurements, and at least one determined battery cell complex measurement. Furthermore, it may be possible to adjust a power forecast for the battery cell complex, as defined in the control regulations, based on the determined individual battery cell measurements, the determined battery cell assembly measurements, and at least one determined battery cell complex measurement.An initial state of charge of the battery cell arrays and / or an initial state of aging of the capacity of the battery cell arrays and / or an initial state of aging of the resistance of the battery cell arrays, as specified in the control regulations, can be adjusted at least depending on the battery cell array measurement values.

[0023] Furthermore, it is possible that for the respective battery cell assemblies a relationship between current or state of charge or temperature and determined internal resistance or determined impedance behavior is determined and stored in the control regulation.

[0024] It may further be provided that a contact resistance is determined for each current-carrying component of the cell contacting system, wherein the cell contacting system comprises, as current-carrying components, at least the cell connectors and terminals connecting the battery cells to one another. At least two terminals may be connected to the battery cell complex, through which electrical energy can be supplied to or drawn from the battery cell complex. Depending on the determined contact resistances of the current-carrying components of the cell contacting system, at least one protective function defined in the control regulations can be adjusted.

[0025] Battery cell assemblies for which battery cell assembly measurements have been determined that lie outside a specified standard range and within a specified tolerance range can be marked in the battery management system, allowing these marked battery cell assemblies to be monitored during operation.

[0026] The control rule is thus stored in the battery management system. The battery management system is configured to control energy input into and output from the battery cells using the control rule, whereby the control rule is based on the battery cell measurements characterizing the battery cells before the assembly of the battery cell complex, the battery cell complex measurements characterizing the individual battery cell assemblies, and at least one battery cell complex measurement characterizing the battery cell complex.

[0027] The described invention is based on the understanding that batteries, in particular lithium-ion batteries, can be used to power a motor vehicle that is at least partially electrically driven. To achieve the necessary voltage, individual battery cells are interconnected via a cell contacting system in a combination of multiple parallel and series connections. In this way, individual battery cells form an entire energy cluster, which can also be referred to as a battery cell complex, and which can be connected in modules or directly into a high-voltage storage system.The external battery management system allows for the monitoring of individual battery cells, which are interconnected via the cell contacting system and cell sensors for voltage and temperature monitoring. Specifically, the sensors are located on the respective cell connectors that link the battery cell assemblies. Software functions on a battery control unit within the battery management system can use sensor data provided by the cell sensors to calculate the current state of all battery cell assemblies and their operating characteristics at any given time. To meet ever-increasing demands regarding energy, performance, cost, and installation space, there is a trend toward highly integrated storage concepts. In their integrated state, no or only very limited rework or serviceability is required at the end of production or at the customer's site.Consequently, particularly high quality requirements apply, which must be verified through suitable testing methods throughout the entire manufacturing process. An important example of this is the correct connection and interconnection of the battery cell assemblies via the cell contacting system and comprehensive testing of the individual battery cells before installation. Due to the ambitious energy and performance targets, a thorough understanding of the individual battery cell and system behavior during operation is crucial.

[0028] Due to their manufacturing process, battery cells exhibit variations in their specific properties such as energy, impedance, capacity, fast-charging capability, performance, and aging. A vehicle battery can consist of hundreds to thousands of individual battery cells, each with corresponding variations in its individual properties. It is known to perform cell-specific data assignment based on an expected nominal value or the average value of the individual battery cells. This can lead to overloading if, for example, the statistical distribution of the properties of the individual battery cells is smaller than the nominal value. Similarly, if the expected values ​​exceed the nominal value, any additional potential remains untapped.

[0029] The basic principle of the described method is the use of highly accurate battery cell-specific values ​​as calibration of a respective hardware combination for status monitoring of respective battery cell arrays and the entire battery cell complex.

[0030] In other words, during the vehicle battery setup process, each individual battery cell is electrically characterized upon receipt, specifically by measuring its impedance and voltage characteristics and assigning them to the specific battery cell group to which it belongs within the battery cell complex in the battery management system. After measuring the individual battery cells, the battery cell complex is manufactured, consisting of numerous battery cell groups connected in series and parallel. Once the battery cell complex is mechanically assembled, its individual cells are electrically contacted via the cell contacting system, thus connecting each individual cell.The battery cell complex can be electrically loaded via a current-carrying path without software or electronic units, and its impedance behavior, including all individual voltages of the series-connected battery cell arrays, can be measured. From this, a virtual model of all measured individual battery cells, their resulting properties after parallel connection, and the contact resistances of all other system components can be created, thus generating a model of all electrically relevant individual parts of the battery cell complex. This virtual model of the individual battery cell complex is transferred to the battery control unit of the battery management system during its quality control check before completion in the so-called "End of Line Test," thereby correcting any existing data from an expected nominal value to the measured specific data of the battery cell complex.Specifically, the capacity, particularly the electrical charge in ampere-hours that the battery cells can hold, and / or the energy of the resulting battery cell complex are corrected based on the measured values. The energy is a value in watt-hours, including battery losses, which can be utilized. Furthermore, the internal resistance and impedance behavior of the resulting battery cell complex are corrected based on current, state of charge, and temperature. Additionally, the performance of the battery cells, as defined in the control code, is corrected. Furthermore, a fast-charging characteristic curve and control parameters for the battery cells can be corrected in the control code. Protective functions for monitoring current-carrying components can be corrected in the control code using the measured contact resistances.Furthermore, it may be stipulated that an initial state of charge (SOC) and / or an initial state of capacity aging (SOHc) and / or an initial state of resistance aging (SOHc) of the resulting battery cell complex from the battery cell arrays are corrected depending on the respective measured values. Additionally, the control regulation may include a calibration correction for the power forecast of the battery cell complex. The power of a battery cell or battery cell complex is the electrical energy extracted within a given time period, relative to that time period. It is specified in watts and is the product of discharge current and discharge voltage. The worst-performing battery cell determines the maximum power output of the battery cell complex.Therefore, the more precisely the properties of the worst-performing battery cell are known, the more accurately the performance of the battery cell complex can be predicted.

[0031] Unusual readings from battery cell arrays or system components that deviate from the specified standard range, but are still within their permissible tolerance, can be flagged in the battery control unit of the battery management system. This allows for monitoring of these components over their operation and lifespan using additional monitoring structures and data acquisition. This enables the overall system limits of the battery cell complex to be adjusted based on the monitored battery cell arrays or system components. Alternatively or additionally, individual control of the flagged battery cell array is possible. Furthermore, a service message can be triggered depending on the monitoring results.

[0032] Overall, the invention demonstrates how the calibration of individual HVS core properties can be implemented using manufacturing quality control data. Reference symbol list V1 to V4 respective process steps

Claims

[1] A method for setting up a vehicle battery, comprising a plurality of battery cells, a cell contacting system by means of which the battery cells are interconnected to form a battery cell complex, comprising a plurality of battery cell assemblies connected in series and / or in parallel, in which the battery cells are each connected in parallel, and a battery management system configured to control energy input into and energy withdrawal from the battery cells by means of at least one control rule, wherein the method - for each battery cell, at least one battery cell measurement value characterizing the respective battery cell is determined before the battery cell complex is assembled, and the battery cell measurement values ​​are assigned to the corresponding battery cells and stored in the battery management system (V1), - for each battery cell group, at least one battery cell group measurement value characterizing the battery cell group is determined and assigned to the associated battery cell group and stored in the battery management system (V2), - at least one battery cell complex measurement value, which characterizes the battery cell complex produced from the battery cells, is determined and stored in the battery management system (V3), - at least one control rule of the battery management system is adapted depending on the determined battery cell measurements, the determined battery cell composite measurements and the at least one determined battery cell complex measurement (V4). [2] Method according to claim 1, characterized by, that depending on the determined battery cell measurements, the determined battery cell assembly measurements and at least one determined battery cell complex measurement, a nominal capacity of the battery cell complex and / or a power of the battery cell complex is determined and stored in the tax regulation (V4). [3] Method according to claim 1 or 2, characterized by , that a fast charging characteristic curve and / or charging or discharging control parameters for the battery cells stored in the control regulation are adapted depending on the battery cell measurements, the determined battery cell composite measurements and the at least one determined battery cell complex measurement (V4). [4] Method according to any one of the preceding claims, characterized by, that a performance forecast for the battery cell complex stored in the tax regulation is adjusted depending on the determined battery cell measurements, the determined battery cell assembly measurements and the at least one determined battery cell complex measurement (V4). [5] Method according to any one of the preceding claims, characterized by , that a relationship between an internal resistance or impedance behavior of respective battery cell assemblies with a current and / or a state of charge of the respective battery cell assemblies and / or a temperature of the respective battery cell assemblies is determined and stored in the control regulation (V4). [6] Method according to any one of the preceding claims, characterized by, that a contact resistance is determined for each current-carrying component of the cell contacting system, wherein the cell contacting system comprises as current-carrying components at least the cell connectors and terminals connecting the battery cells to each other, wherein at least two terminals are connected to the battery cell complex, through which electrical energy can be supplied to or taken from the battery cell complex, and depending on the determined contact resistances of the current-carrying components of the cell contacting system, at least one protective function specified in the control regulation is adapted (V4). [7] Method according to any one of the preceding claims, characterized by, that an initial charge state of the battery cell assemblies and / or an initial aging state of the capacity of the battery cell assemblies and / or an initial aging state of the resistance of the battery cell assemblies stored in the tax regulation is adjusted at least as a function of the battery cell assembly measurement values ​​(V4). [8] Method according to any one of the preceding claims, characterized by , that battery cell assemblies for which battery cell assembly measurements have been determined which lie outside a specified standard range and within a specified tolerance range, are marked in the battery management system, thereby enabling these marked battery cell assemblies to be monitored during operation. [9] Method according to any one of the preceding claims, characterized by , that the measured values ​​are the impedance behavior and / or the voltage behavior and / or the resistance and / or an inductance.[10] Battery management system for a vehicle battery of a motor vehicle, comprising a plurality of battery cells and a cell contacting system by means of which the battery cells are interconnected to form a battery cell complex, which comprises a plurality of serially interconnected battery cell assemblies in which the battery cells are each interconnected in parallel, wherein a control rule is stored in the battery management system and the battery management system is configured to control an energy input into the battery cells and an energy withdrawal from the battery cells by means of the control rule, wherein the control rule is based on battery cell measurement values ​​determined before the assembly of the battery cell complex that characterize the battery cells,The battery cell arrays are based on the battery cell array measurement values ​​that characterize each battery cell array and at least one battery cell complex measurement value that characterizes the battery cell complex.

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