DE102022112688B3 - Reconfigurable battery with additional voltage outputs - Google Patents

Abstract

The present invention proposes a reconfigurable battery for an electric traction system with complete control not only of AC voltage phases (101, 102, 109) for a multi-phase load (108), but also at least one further DC or AC voltage output (107), without the need for additional controlled switch required or the AC voltage phases (101, 102, 109) would be affected. A method for providing the at least one further DC or AC voltage output (107) is also explained.

Description

The present invention relates to a reconfigurable battery with multiple phases and at least one further or additional voltage output. A method for providing the at least one further voltage output at the reconfigurable battery is also claimed.

Modular or cascaded converters are becoming increasingly popular representatives of both AC and DC systems. Intelligently switched batteries with AC voltage output now meet a whole range of long-requested technical properties, such as improved flexibility, greater controllability facilitated by additional degrees of freedom, improved quality in the output voltage provided, and last but not least predictable scalability. Due to the latest advances in energy storage towards higher energy levels and performance, the systems are evolving towards higher voltages with reduced currents at the same time in order to achieve the same nominal performance, or even to provide even higher performance with the same currents. However, there are also disadvantages associated with higher voltage levels, such as higher nominal voltage specifications for loads, e.g. electric machines of electric vehicles, or semiconductors and/or additional power levels, which automatically result in higher maintenance effort, loss of performance, or higher costs. In addition, multiple outputs with different voltage levels are necessary for many applications, which leads to an increase in the number of converter stages required and thus to costs.

In many applications, e.g. electric vehicles, more than one (usually three-phase) AC voltage output is required in the energy supply system. A DC voltage output is also required for consumers who only need weak power. Reconfigurable batteries based on modular multilevel converters, possibly with serial and parallel connection options, which provide an alternating current by modulating the module connections (or their energy storage) and are referred to below as AC batteries, offer many advantages, but are still being provided multiple phases limited. Up until now, controlling the modules arranged in strings has only allowed an individual phase or a single DC voltage to be output per string. In addition, the possibility of charge exchange between different strands is extremely limited. In the prior art, for example, at least one phase or one power stage is required with previous methods for each phase/DC voltage to be provided.

The pamphlet WO 2014/145756 A1 discloses a reconfigurable energy storage system which has one or more energy modules, with a respective energy module comprising at least two input/output connections and having at least four switches, whereby an energy storage unit of the respective energy module can be connected in series with neighboring energy modules or can even be bypassed. The switches are connected to a controller which configures the energy modules to output a desired voltage.

In the US publication U.S. 2017/0217318 A1 describes a reconfigurable battery pack having multiple reconfigurable units, such as power cells, switches, or toggles coupled to the reconfigurable units within the reconfigurable battery pack. The switches or toggles can be controlled such that the reconfigurable units are reconfigured according to loads with different power or voltage specifications that are connected directly to the reconfigurable battery pack.

Although it is possible to supply a respective load through a respective tap between the modules arranged in the string, i.e. to assign respective groups of modules in the individual string to the respective loads, the control of the modules is severely restricted with such a procedure, since a respective provided Power is coupled through the modules connected to each other in the string. For example, an equalizing charge must flow from the other modules in the string to those modules that are temporarily exposed to a higher load. In addition, when controlling the individual strand, the respective control goals of the respective groups can contradict one another. The respectively output voltage can also have interference, or an arrangement of additional (controlled) semiconductor switches can become necessary. After all, an additional load within just one part of the strand always leads to unnecessary losses in addition to the charge balancing problems.

The pamphlet WO 2017/058253 A1 discusses a modular multilevel converter with multiple power modules arranged in upper and lower branches. A respective AC voltage for a multi-phase load is provided by a respective tap between the upper and lower branches.

The pamphlet DE 10 2018 003 642 A1 describes a three-phase inverter for supplying an electric motor. The three-phase inverter has two single-phase inverters, each with battery modules connected in series, the two single-phase inverters being connected to one another in series.

In general, for applications in the electric vehicle sector, it is desirable to be able to achieve the highest possible voltage levels in the battery pack in order to minimize the charging time, with a high-voltage battery leading to an increase in the nominal voltage specifications for other components installed in the electric vehicle, such as semiconductors or traction motors. This can prove disadvantageous since, for example, a high-voltage inverter for generating AC voltage is associated with higher costs in conventional battery packs that only output DC voltage.

Against this background, it is an object of the present invention to propose a battery system with a plurality of AC voltage phases provided for a load, at which additional AC or DC voltage connections are provided which are both galvanically isolated, i. H. are galvanically isolated and galvanically non-isolated. A respective additional AC or DC voltage connection, which is connected or is to be connected to an additional load, should not disturb the AC voltage phases that are also provided. Furthermore, a method for controlling the battery system is to be claimed.

A reconfigurable battery with a plurality of voltage outputs is proposed to solve the above-mentioned task, the reconfigurable battery comprising a controller and a number of K*M series-connected strings of N series-connected modules. where K, M>1, and N are positive integers. A respective module has at least one energy store and at least two semiconductor switches. The reconfigurable battery is designed to connect the at least one energy store of the respective module to the at least one energy store of another module. The controller is configured to control the switches of the modules using pulse width modulated control signals. A respective phase-shifted carrier signal is assigned to a respective strand. A respective voltage output for a respective phase for a K*M-phase load is provided by a respective tap directly before a first module of the respective string and directly after a last module of the respective string. At least one further voltage output is provided by at least one further tap around at least one strand of the K*M strands. A respective relay is arranged between the respective tap and the K*M-phase load, and between the respective further tap and the respective further voltage output. The reconfigurable battery is rechargeable via a charging port.

The reconfigurable battery according to the invention thus provides further voltage outputs without additional controllable semiconductors having to be arranged for this purpose.

The reconfigurable battery according to the invention has a total of K*M*N series-connected modules in a row, the minimum requirement for a microtopology of the respective module for the at least one energy store and the at least two semiconductor switches being that the respective module has a positive and negative Voltage +/- V _m is provided. A system with such modules is, for example, one by R. Marquardt in the publication U.S. 2018/0 109 202 A1 disclosed modular multilevel converter, also abbreviated as MMC or M2C.

In the case of multi-phase loads with individual phases that are isolated from one another, as is the case, for example, with electrical machines, the load can be supplied by tapping off the strands of modules, as described in the case of the reconfigurable battery according to the invention. Phase-shifted carrier signal modulation, referred to as "phase shifted carrier (PSC) modulation", is one of the most common techniques, which provides both scheduling and modulation of the modules with little effort. In general, however, other techniques for controlling the reconfigurable battery according to the invention can also be used.

In phase-shifted carrier signal modulation, optimal quantization is achieved with a voltage provided per phase by a uniform phase shift of the carrier signals. For a switching period with N modules, this is given by a phase shift of 2π/N. On the other hand, there are no special restrictions for phase shifts of carrier signals relating to different phases (here: different strands): a phase difference in this regard has no effect whatsoever on a quality of the voltage provided per phase. However, such a Pha difference, i.e. a different starting point of a "starting" of the respective carrier signals of different strands, very well effects on a total voltage V _total obtained when tapping around all strands, which corresponds to a terminal voltage between a first pole arranged in front of the first module of the first strand and a second pole arranged after the last module of the last string corresponds.

If the reconfigurable battery according to the invention is in a charging mode, for example all relays are open and the respective loads are thus disconnected from the reconfigurable battery. In this case, nominal voltages of the respective loads can advantageously be lower than a charging voltage, which may be in the high-voltage range, in order to carry out rapid charging. With the charging port connected to the entire row of K*M*N modules serially connected to each other, all energy stores of the modules are charged evenly, so that advantageously a need for subsequent charge equalization is reduced. Depending on the type of charging current connected, the reconfigurable battery according to the invention can be dynamically modulated (AC charging current) or expect a constant voltage value corresponding to a nominal charging voltage (DC charging current).

In an operating mode in which the reconfigurable battery according to the invention is discharged, for example by a traction motor as a multi-phase load, the controller can distribute the load evenly over the modules, which advantageously reduces the need for charge equalization here as well. A higher switching frequency is advantageously achieved by the overlapping control. Since the reconfigurable battery according to the invention is divided into a number of phases of the multi-phase load, a maximum voltage of the battery can be significantly higher than a nominal voltage of the multi-phase load or the other connected loads. Therefore, for example, in a three-phase motor with a nominal voltage of 400 V, a high-voltage battery pack with, for example, 1200 V can be used, the division of which according to the invention into three strands of 400 V each corresponds exactly to the needs of the three-phase motor.

In one embodiment of the reconfigurable battery according to the invention, the at least one further voltage output is provided by being tapped before a first module of the first string and after a last module of the last string.

In another embodiment of the reconfigurable battery according to the invention, the at least one further voltage output is provided by tapping around a group of M strings of the K*M strings lined up next to one another, whose respective phase shifts together result in 360 degrees. A voltage signal provided in this way can have a very high frequency of up to K*N*M times the switching frequency of an individual module, so that a filter or a transformer to galvanically isolate the further voltage output in relation to the modules can be correspondingly small.

In a further embodiment of the reconfigurable battery according to the invention, the controller is configured to regulate a voltage value at the at least one further voltage output by modifying the phase shift of the carrier signals between different strands of the K*M strands.

By controlling the phase shift between carrier signals of different phases, a voltage signal of the total voltage V _total is modified without adverse effects on a quality or a waveform of the voltage provided per phase. The voltage signal provided is an AC voltage with a frequency of up to K*M times a switching frequency of an individual module, wherein an amplitude can assume a magnitude value between 0 V and the number of phases times a module voltage value V _m . By means of suitable control, it is possible to limit a maximum total voltage that occurs to a range between +V _m and -V _m , which at such relatively low voltage values results in further advantages for a selection of inexpensive semiconductors.

In yet another embodiment of the reconfigurable battery according to the invention, the at least one further voltage output is galvanically isolated or not galvanically isolated from the at least one further tap.

In a still further refinement of the reconfigurable battery according to the invention, an output voltage provided at the at least one further voltage output is an AC voltage.

In an even further developed embodiment of the reconfigurable battery according to the invention, an output voltage provided at the at least one further voltage output is rectified.

In a continued further refinement of the reconfigurable battery according to the invention, K further voltage outputs of the at least one further voltage output are provided, with a respective tap being formed around M strings lined up in a row for the respective further voltage output.

In a further refinement of the reconfigurable battery according to the invention, the controller is configured to connect the at least one energy store of the respective module to at least one energy store of another module in series or in parallel or bypassing at least one energy store of an adjacent module. A system with this kind of modules is described, for example, in “Goetz, SM; Peterchev, A.V.; Weyh, T., "Modular Multilevel Converter With Series and Parallel Module Connectivity: Topology and Control," Power Electronics, IEEE Transactions on , vol.30, no.1, pp.203,215, 2015. doi: 10.1109/TPEL.2014.2310225.

Furthermore, a method for providing voltage outputs on a reconfigurable battery is claimed, the reconfigurable battery comprising a controller and a number of K*M series-connected strings of N series-connected modules. where K, M>1, and N are positive integers. A respective module has at least one energy store and at least two semiconductor switches. The reconfigurable battery is designed to connect the at least one energy store of the respective module to the at least one energy store of another module. The switches of the modules are controlled using pulse width modulated control signals. A respective phase-shifted carrier signal is assigned to a respective strand. A respective tap for a respective voltage output of a respective phase for a K*M-phase load is provided on the respective strand. At least one further voltage output is provided by at least one further tap around at least one strand of the K*M strands. A respective relay is arranged between the respective tap and the K*M-phase load and between the respective further tap and the respective further voltage output, and a charging connection is arranged on the reconfigurable battery.

In one embodiment of the method according to the invention, a reconfigurable battery according to the invention is provided.

Furthermore, a control method for a reconfigurable battery according to the invention is claimed, wherein the phase shifts of the carrier signals between different strands of the K*M strands are modified, whereby a voltage value at the at least one further voltage output is regulated.

Further advantages and refinements of the invention result from the description and the attached drawing.

It goes without saying that the features mentioned above and those still to be explained below can be used not only in the combination specified in each case, but also in other combinations or on their own, without departing from the scope of the present invention.

• 1 zeigt eine schematische Schaltung mit einer Multiphasenlast und einem weiteren Spannungsausgang in einer Ausgestaltung der erfindungsgemäßen rekonfigurierbaren Batterie.
• 2 zeigt eine schematische Schaltung mit einem Abgriff nur um eine Untermenge an Strängen für den weiteren Spannungsausgang in einer weiteren Ausgestaltung der erfindungsgemäßen rekonfigurierbaren Batterie.
• 3 zeigt eine schematische Schaltung mit einem galvanisch nicht-isolierten weiteren Spannungsausgang in einer noch weiteren Ausgestaltung der erfindungsgemäßen rekonfigurierbaren Batterie.
• 4 zeigt graphisch Spannungsverläufe zu einem weiteren Spannungsausgang mit Wechselspannung in einer fortgesetzt weiteren Ausgestaltung der erfindungsgemäßen rekonfigurierbaren Batterie.
• 5 zeigt eine schematische Schaltung mit dem weiteren Spannungsausgang mit Wechselspannung in der fortgesetzt weiteren Ausgestaltung der erfindungsgemäßen rekonfigurierbaren Batterie.
• 6 zeigt eine schematische Schaltung mit einer Multiphasenlast und zwei weiteren Spannungsausgängen in einer fortgesetzt noch weiteren Ausgestaltung der erfindungsgemäßen rekonfigurierbaren Batterie.
• 7 zeigt ein generisches Blockdiagramm zu einer Ausführungsform des erfindungsgemäßen Steuerungsverfahrens.

The figures are described in a coherent and comprehensive manner, and the same reference symbols are assigned to the same components.

• 1 shows a schematic circuit with a multi-phase load and a further voltage output in an embodiment of the reconfigurable battery according to the invention.
• 2 shows a schematic circuit with a tap for only a subset of strands for the further voltage output in a further embodiment of the reconfigurable battery according to the invention.
• 3 shows a schematic circuit with a galvanically non-insulated additional voltage output in yet another embodiment of the reconfigurable battery according to the invention.
• 4 shows graphically voltage curves for a further voltage output with AC voltage in a continued further embodiment of the reconfigurable battery according to the invention.
• 5 shows a schematic circuit with the further voltage output with AC voltage in the continued further embodiment of the reconfigurable battery according to the invention.
• 6 shows a schematic circuit with a multi-phase load and two further voltage outputs in a still further embodiment of the reconfigurable battery according to the invention.
• 7 shows a generic block diagram for an embodiment of the control method according to the invention.

In 1 1 shows a schematic circuit 100 with a multi-phase load 108 and a further voltage output 107 in an embodiment of the reconfigurable battery according to the invention. The reconfigurable battery shown for K=1 comprises a number of M series-connected strands 110, 120, 190, which each provide a phase 101, 102, 109 for the multi-phase load 108 via a multiple relay 104. The M strands 110, 120, 190 each have a row of N modules 111, 112, 119, 121, 122, 129, 191, 192, 199. Between the second strand 120 and the Mth strand 190 there can also be a series of (M−3)>0 further strands. According to the invention, the further voltage output 107 is provided by the reconfigurable battery and fed via a relay 105 from a tap 151, 152 around all M strands 110, 120, 190. A voltage value at the voltage output 107 is controlled via a modification of a phase shift of respective carrier signals of the M strands 110, 120, 190. The further voltage output 107 is electrically isolated from the relay 105 or the tap 151, 152 via a transformer. In addition, a rectifier is connected between the transformer and the further voltage output 107 so that a DC voltage is present at the further voltage output 107 . A charging connection 106 is also connected to the tap 151, 152 around all M strands 110, 120, 190. Charging of the M strands 110, 120, 290 by means of recuperation by the multiphase load 108 is also possible in the circuit 100.

In 2 shows a schematic circuit 200 with a tap 251, 252 only a subset of strands for the further voltage output 107 in a further embodiment of the reconfigurable battery according to the invention. The subset of strands is formed at least by the second strand 120 and a selection from among all (M-3) strands optionally arranged further ahead of the Mth strand 190 . The phases taken from this subset of strands advantageously form a complete multi-phase system with a sum of 360 degrees over all associated phase shifts. For example, in a six-phase system, tapping 251, 252 advantageously only needs to take place on three selected strands with phases whose associated phase shifts add up to 360 degrees. The complete multi-phase system meant here is accompanied by the fact that a sum over the respective voltages V _i of the phases of the multi-phase system is equal to zero (Σ V _i =0). This is particularly advantageous for diodes of the rectifier in front of the further voltage output 107 because their nominal voltage is reduced as a result. The maximum voltage difference V _max between two phases results, for example, in a three-phase system with M=3. $$V_{\text{Max}}=\left(\left[m\times \left(N\right)\right]\right)+1)V_m\times \left(\text{sin}\left(\omega t\right)-\text{sin}\left(\omega t+\frac{2\pi }{3}\right)\right)<\left(N+1\right)V_m$$

This is slightly higher than a third of the maximum possible terminal voltage.

In 3 a schematic circuit 300 with a galvanically non-insulated further voltage output 307 is shown in yet another embodiment of the reconfigurable battery according to the invention. As in 1 the tap 151, 152 for the further voltage output 307 takes place around all M strands 110, 120, 190. The connection of the further voltage output 307 to the relay 105 is not electrically isolated, which can advantageously increase the efficiency of the system.

In 4 voltage curves 400 are shown graphically for a further voltage output with alternating voltage 420 in a continued further embodiment of the reconfigurable battery according to the invention. The tap that takes place around all strands shows a voltage profile of a total voltage _Vtotal 410, plotted as a scaled voltage value 402 along a time axis 401. A scaled voltage value 402 of 1 means that all modules have switched on their energy stores with a positive voltage contribution +V _m : V _total = Σ V _m Correspondingly, a scaled voltage value 402 of −1 means that all modules have switched on their energy stores with a negative voltage contribution −V _m . The AC voltage 420 is provided as a filtered signal at the further voltage output. By controlling the phase shift 430 of the carrier signals between different strands, according to Plotted on the right with phase shift value 403 as the vertical axis, a voltage signal of the AC voltage 420 provided at the further voltage output, in particular its amplitude, is modified.

In 5 a schematic circuit 500 with the further voltage output 507 with AC voltage is shown in the continued further embodiment of the reconfigurable battery according to the invention. A three-phase motor 508 is powered by three phases 101, 102, 503 of the reconfigurable battery. The tap that takes place around all three strands 110, 120, 530 is electrically isolated from the further voltage output 507 by a high-frequency transformer 557. The frequency of the AC voltage is a switching frequency of modules 111, 112, 119, 121, 122, 129, 531, 532, 539 multiplied by a number N of modules.

In 6 a schematic circuit 600 with a multi-phase load 608 with six phases 101, 102, 109, 601, 602, 609 and two further voltage outputs 307, 607 is shown in a still further embodiment of the reconfigurable battery according to the invention. The reconfigurable battery shown for K=2 and M=3 comprises K=2 blocks each with M=3 strings, a first block with a number of M=3 strings 110, 120, 190 connected in series, and one in series with the first Block connected second block also with a number of M = 3 series-connected strands 610, 620, 690 on modules 611, 612, 619, 621, 622, 629, 691, 692, 699. By tapping around the first block, the Relay 105 provides the additional voltage output 307 , and the second additional voltage output 607 is provided via a relay 605 by tapping around the second block.

verteilt sind, an einen Komparator 708 weiter. Zum Abgleich erhält der Komparator 708 außerdem ein Einzelreferenzsignal 748 zur i-ten Phase aus einem Regler 704 der i-ten Phase, woraufhin multiple Schaltsignale 780 an die Module der rekonfigurierbaren Batterie übermittelt werden. Der (i+1)-te Zähler 707 gibt N Trägersignale, welche gleichmäßig auf $\left[{\varphi }_{\text{i}+1},{\varphi }_{\text{i}+1}+\frac{2\pi }{N},{\varphi }_{\text{i}+1}+2\frac{2\pi }{N},\dots \right]$

$$

verteilt sind, an einen Komparator 709 weiter. Zum Abgleich erhält der Komparator 709 außerdem ein Einzelreferenzsignal 769 zur (i+1)-ten Phase aus einem Regler 706 der (i+1)-ten Phase, woraufhin multiple Schaltsignale 790 an die Module der rekonfigurierbaren Batterie übermittelt werden.In 7 A block diagram 700 is shown for an embodiment of the control method according to the invention. By controlling the phase shift between carrier signals of different phases, a voltage signal of the total voltage _Vtotal is modified without adverse effects on a quality or a waveform of the voltage provided per phase. A feedback loop 701 continuously delivers an error 712 between the reference signal and the measured signal to a controller 702, for example a PI controller, which determines a degree of utilization 723 necessary for error correction. This degree of utilization 723 is transmitted to a controller 703 to determine the phase differences between adjacent strands, i.e. according to the invention to determine different starting points for the respective carrier signals of adjacent strands to "start running", which in turn transmits a starting phase ϕ _i 735 of a first module in each strand to an i th counter 705 and a start phase φ _i+1 737 of a first module in each strand to an (i+1) th counter 707. The i-th counter 705 outputs N carrier signals which are evenly distributed $\left[{\varphi }_{\text{i}},{\varphi }_{\text{i}}+\frac{2\pi }{N},{\varphi }_{\text{i}}+2\frac{2\pi }{N},...\right]$

are distributed, to a comparator 708 on. To adjust, the comparator 708 also receives a single i th phase reference signal 748 from an i th phase controller 704, whereupon multiple switching signals 780 are sent to the modules of the reconfigurable battery. The (i+1)th counter 707 outputs N carrier signals which are evenly distributed $\left[{\varphi }_{\text{i}+1},{\varphi }_{\text{i}+1}+\frac{2\pi }{N},{\varphi }_{\text{i}+1}+2\frac{2\pi }{N},...\right]$

$$

are distributed, to a comparator 709 on. For adjustment, the comparator 709 also receives a single reference signal 769 for the (i+1)th phase from a controller 706 for the (i+1)th phase, whereupon multiple switching signals 790 are transmitted to the modules of the reconfigurable battery.

Reference List

100

First schematic circuit

101

stage 1

102

stage 2

104

multiple relays

105

relay

106

charging port

107

DC output

108

Multiphase machine with M phases

109

Phase M

110

strand 1

111

module 1

112

module 2

119

Module N

120

strand 2

121

Module 1+N

122

Module 2+N

129

Module 2N

151

tap to the relay

152

tap to the relay

190

strand M

191

Module 1+(M-1)*N

192

Module 2+(M-1)*N

199

Module M*N

200

Second schematic circuit

251

First connection to the relay

252

Second connection to the relay

300

Third schematic circuit

307

Non-isolated DC output

400

voltage curves

401

timeline

402

tension axis

403

phase shift angle

410

total voltage Vt _total

420

Filtered AC voltage

430

phase shift

500

Fourth schematic circuit

503

third phase

504

multiple relays

507

AC output

508

three-phase motor

531

Module (1+2N)

532

Module (2+2N)

539

Module (3N)

557

Optionally galvanically isolated

600

Fifth schematic circuit

601

Phase M+1

602

Phase M+2

604

Sixfold relay

605

relay

607

Second DC output

608

Multiphase machine with 2M phases

609

Phase 2M

610

Module group 1, second block

611

module 1

612

module 2

619

Module N

620

Module group 2, second block

621

Module 1+N

622

Module 2+N

629

Module 2N

690

Module group M, second block

691

Module 1+(M-1)*N

692

Module 2+(M-1)*N

699

Module M*N

700

Block diagram of the procedure

701

feedback loop

702

controller

703

Determination of phase differences between adjacent strands

704

i-th phase controller

705

i-th counter

706

(i+1) phase controller

707

(i+1)th counter

708

First comparator

709

Second comparator

712

Error between reference signal and measured signal

723

Utilization level necessary for error correction

735

Start phase φ _i of a first module in each strand

737

Start phase ϕ _i+1 of a first module in each string

748

Single reference signal for i-th phase

758

N carrier signals

769

Single reference signal for (i+1)th phase

779

N carrier signals

780

Multiple switching signals

790

Multiple switching signals

Claims (12)

Reconfigurable battery with multiple voltage outputs, the reconfigurable battery having a controller and a number of K*M strings (110, 120, 190, 530, 610, 620, 690) serially connected to each other of N series-connected modules (111, 112, 119, 121, 122, 129, 191, 192, 199, 531, 532, 539, 611, 612, 619, 621, 622, 629, 691, 692, 699) where K, M>1, N positive integers are numbers, where a respective module (111, 112, 119, 121, 122, 129, 191, 192, 199, 531, 532, 539, 611, 612, 619, 621, 622, 629, 691, 692, 699) has at least one energy store and at least two semiconductor switches, wherein the reconfigurable battery is designed to the at least one Energy storage of the respective module (111, 112, 119, 121, 122, 129, 191, 192, 199, 531, 532, 539, 611, 612, 619, 621, 622, 629, 691, 692, 699) with the at least to interconnect an energy store of another module (111, 112, 119, 121, 122, 129, 191, 192, 199, 531, 532, 539, 611, 612, 619, 621, 622, 629, 691, 692, 699). , wherein the controller is configured to operate the switches of the modules (111, 112, 119, 121, 122, 129, 191, 192, 199, 531, 532, 539, 611, 612, 619, 621, 622, 629, 691 , 692, 699) by means of pulse width modulated control signals, with a respective set of N carrier signals being assigned to a respective strand (110, 120, 190, 530, 610, 620, 690) and the respective sets of carrier signals between different strands having a phase shift relative to one another have, with a respective tap immediately before a first module (111, 121, 191, 531, 611, 621, 691) of the respective strand (110, 120, 190, 530, 610, 620, 690) and immediately after a last Module (119, 129, 199, 539, 619, 629, 699) of the respective strand (110, 120, 190, 530, 610, 620, 690) a respective voltage output for a respective phase (101, 102, 109, 503, 601, 602, 609) for a K*M-phase load (108, 508, 608), with at least one further tap (151, 152, 251, 252) around at least one phase of the K*M phases (110 , 120, 190, 530, 610, 620, 690) at least one further voltage output (107, 307, 507, 607) is provided, wherein between the respective tap (151, 152, 251, 252) and the respective voltage output (107, 307, 507, 607) or the load (108, 508, 608) a respective relay (104, 105, 504, 604, 605) is arranged, and wherein the reconfigurable battery can be charged via a charging connection (106). Reconfigurable battery after claim 1 , wherein the at least one further voltage output (107, 507) is tapped (151, 152) before a first module (111) of the first line (110) and after a last module (199, 539) of the last line (190, 530 ) is provided. Reconfigurable battery after claim 1 , the at least one further voltage output (107, 307, 507, 607) being tapped (251, 252) around a group of M strings of the K*M strings (110, 120, 190, 530, 610, 620, 690) is provided, whose respective phase shifts add up to 360 degrees. The reconfigurable battery of any preceding claim, wherein the controller is configured to, by modifying the phase shift of the carrier signals between different strings of the K*M strings (110, 120, 190, 530, 610, 620, 690) a voltage value at the at least one to regulate another voltage output (107, 307, 507, 607). Reconfigurable battery according to one of the preceding claims, wherein the at least one further voltage output (107, 307, 507, 607) is galvanically isolated or galvanically non-isolated from the at least one further tap (151, 152, 251, 252). Reconfigurable battery according to one of the preceding claims, wherein an output voltage provided at the at least one further voltage output (507) is an AC voltage. Reconfigurable battery according to one of the Claims 1 until 5 , An output voltage provided at the at least one further voltage output (107, 307, 607) being rectified. Reconfigurable battery according to one of the preceding claims, wherein K further voltage outputs (307, 607) of the at least one further voltage output are provided, wherein for the respective (307, 607) further voltage output a respective tap around respectively M strands (110, 120, 190 , 530, 610, 620, 690). Reconfigurable battery according to one of the preceding claims, wherein the controller is configured to the at least one energy store of the respective module (111, 112, 119, 121, 122, 129, 191, 192, 199, 531, 532, 539, 611, 612 , 619, 621, 622, 629, 691, 692, 699) in series or parallel or bypassing at least one energy store of an adjacent module (111, 112, 119, 121, 122, 129, 191, 192, 199, 531, 532, 539, 611, 612, 619, 621, 622, 629, 691, 692, 699) with at least one energy store of another module (111, 112, 119, 121, 122, 129, 191, 192, 199, 531, 532, 539, 611, 612, 619, 621, 622, 629, 691, 692, 699). Method for providing voltage outputs on a reconfigurable battery, the reconfigurable battery having a controller and a number of K*M strings (110, 120, 190, 530, 610, 620, 690) serially connected to one another, each of N series-connected modules ( 111, 112, 119, 121, 122, 129, 191, 192, 199, 531, 532, 539, 611, 612, 619, 621, 622, 629, 691, 692, 699) where K, M>1, N are positive integers, where a respective module is (111, 112, 119, 121, 122, 129, 191, 192, 199, 531, 532, 539, 611, 612, 619, 621, 622, 629, 691, 692, 699) has at least one energy store and at least two semiconductor switches, the reconfigurable battery being designed to charge the at least one energy store of the respective module (111, 112, 119, 121, 122, 129, 191 , 192, 199, 531, 532, 539, 611, 612, 619, 621, 622, 629, 691, 692, 699) with the at least one energy store of another module (111, 112, 119, 121, 122, 129, 191, 192, 199, 531, 532, 539, 611, 612, 619, 621, 622, 629, 691, 692, 699), whereby the switches of the modules (111, 112, 119, 121, 122, 129 , 191, 192, 199, 531, 532, 539, 611, 612, 619, 621, 622, 629, 691, 692, 699) are controlled by means of pulse width modulated control signals, with a respective branch (110, 120, 190, 530, 610, 620, 690) a respective set of N carrier signals is assigned and the respective sets of carrier signals between different strands are phase-shifted with respect to one another, with immediately before a first module (111, 121, 191, 531, 611, 621, 691) of the respective strands (110, 120, 190, 530, 610, 620, 690) and immediately after a last module (119, 129, 199, 539, 619, 629, 699) of the respective strand (110, 120, 190, 530, 610 , 620, 690) a respective tap provides a respective voltage output for a respective phase (101, 102, 109, 503, 601, 602, 609) for a K*M-phase load (108, 508, 608), wherein by at least one further tap around at least one strand of the K*M strands (110, 120, 190, 530, 610, 620, 690) at least one further voltage output (107, 307, 507, 607) is provided, with between each tap (151 , 152, 251, 252) and respective voltage output (107, 307, 507, 607) or the load (108, 508, 608) a respective relay (104, 105, 504, 604, 605) is arranged, and wherein at the reconfigurable battery, a charging connection (106) is arranged. procedure after claim 10 , wherein a reconfigurable battery according to any one of claims 2 until 9 provided. Control method for a reconfigurable battery, wherein a reconfigurable battery according to any one of Claims 1 until 9 is provided, the phase shifts of the carrier signals between different strands of the K*M strands (110, 120, 190, 530, 610, 620, 690) being modified, whereby a voltage value at the at least one further voltage output (107, 307, 507, 607) is regulated.

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