WO2014023441A1 - Battery with a plurality of battery strings connected in parallel and method for operating the battery - Google Patents

Battery with a plurality of battery strings connected in parallel and method for operating the battery Download PDF

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Publication number
WO2014023441A1
WO2014023441A1 PCT/EP2013/055393 EP2013055393W WO2014023441A1 WO 2014023441 A1 WO2014023441 A1 WO 2014023441A1 EP 2013055393 W EP2013055393 W EP 2013055393W WO 2014023441 A1 WO2014023441 A1 WO 2014023441A1
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WO
WIPO (PCT)
Prior art keywords
battery
converter
parallel
strings
cells
Prior art date
Application number
PCT/EP2013/055393
Other languages
German (de)
French (fr)
Inventor
Stefan Butzmann
Original Assignee
Robert Bosch Gmbh
Samsung Sdi Co., Ltd.
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Filing date
Publication date
Application filed by Robert Bosch Gmbh, Samsung Sdi Co., Ltd. filed Critical Robert Bosch Gmbh
Publication of WO2014023441A1 publication Critical patent/WO2014023441A1/en

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L50/00—Electric propulsion with power supplied within the vehicle
    • B60L50/50—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells
    • B60L50/60—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells using power supplied by batteries
    • B60L50/64—Constructional details of batteries specially adapted for electric vehicles
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/0034—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using reverse polarity correcting or protecting circuits
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries

Definitions

  • the present invention relates to a battery having a plurality of battery strings connected in parallel and a circuit through which the battery cells of the battery can be charged. Moreover, the invention relates to a method for operating the battery and a motor vehicle that is equipped with the battery.
  • the battery cells can be connected in series and / or in parallel, often using a combination of a series connection and a parallel connection.
  • the configurations either comprise a plurality of parallel connected battery cells or multiple parallel battery strings.
  • Parallel circuit 10 of battery strings 1 1 shown in the first many battery cells 13 are connected in series and the resulting battery strings 1 1 are then connected in parallel.
  • a parallel connection 21 of battery cells can be made, and subsequently a series circuit 22 of the parallel-connected battery cells, so that a circuit topology 20 as shown in Figure 2 results.
  • mixed configurations are also conceivable.
  • the battery voltage is provided at the terminals 14, 15.
  • the terminals 14, 15 may further serve to connect a charging voltage for charging the battery.
  • Battery cells or battery modules when a consumer is connected, due to the tolerances of the internal resistance differently loaded and thus different levels of discharge. When the load is changed, unwanted equalization currents thus arise between the cells. This results in losses and the life of the cells is reduced.
  • the battery cells of a battery system or a battery generally behave differently over the life of the battery system or battery, such as described above, especially older batteries or battery systems, there will be equalization currents between the individual battery strings or battery modules, which will generate additional losses and additionally accelerate battery cell aging.
  • a battery system is known from the document DE 10 2009 028 977 A1, in which a multiplicity of battery modules are coupled to one another via an electrical connection for the purpose of charge equalization.
  • the document DE 10 2009 028 977 A1 in which a multiplicity of battery modules are coupled to one another via an electrical connection for the purpose of charge equalization.
  • Output voltage is enabled. With unequal voltage between the battery modules through the electrical connections equalizing currents flow, which align the voltage between the battery modules together.
  • a special battery is provided with a plurality of battery strings connected in parallel, each of which has at least one battery cell.
  • the battery has a circuit through which the
  • Battery cells of the battery can be charged when a charging voltage is provided to the terminals of the battery. Further, in each of the battery strings connected in parallel, at least one of them is one
  • An advantage of the invention is that decoupling of the battery strings from one another is achieved in a simple and favorable manner. This prevents unwanted equalizing currents. Because of the blocking effect of the diodes in the reverse direction, no current flows into the cells.
  • the series-connected battery cells are connected via the diodes according to the invention with a load, so that the energy is taken from the individual strands decoupled from each other via the diodes.
  • the battery has at least one DC / DC converter, via which battery cells can be charged.
  • This provides a particularly advantageous and flexible possibility for charging the battery cells of the battery according to the invention.
  • the at least one DC / DC converter is connected in parallel with the input terminals of the battery on the input side.
  • an input of the DC / DC converter and an output of the DC / DC converter can be connected to one another.
  • an output of the DC / DC converter is further coupled to the anode of at least one of the diodes.
  • DC / DC converters can be connected to a positive terminal of the battery.
  • the DC / DC converter can be designed as a down converter or as a step-up converter.
  • the battery has a plurality of DC / DC converters according to the invention, which are connected in parallel on the input side.
  • one DC / DC converter can be provided per battery string.
  • the invention can advantageously be applied in particular to a battery which has a series connection of battery modules, of which at least one parallel circuit consists of battery strings or battery cells.
  • the battery system may comprise a lithium-ion battery.
  • Powertrain of the motor vehicle is arranged.
  • the invention is also particularly in stationary
  • FIG. 2 shows a battery system with several series connected
  • FIG. 3 shows a parallel connection of battery strings of a battery circuit according to a first embodiment of the invention
  • FIG. 4 shows a basic circuit diagram of a battery according to a second embodiment of the invention
  • FIG. 3 shows a parallel connection of battery strings of a battery circuit according to a first embodiment of the invention
  • FIG. 4 shows a basic circuit diagram of a battery according to a second embodiment of the invention
  • FIG. 3 shows a parallel connection of battery strings of a battery circuit according to a first embodiment of the invention
  • FIG. 4 shows a basic circuit diagram of a battery according to a second embodiment of the invention
  • Figure 5 shows a DC / DC converter unit according to a third embodiment of the invention.
  • a parallel connection of battery strings 21 is one
  • Battery circuit 30 shown according to a first embodiment of the invention The battery strings 21 each have a multiplicity of battery cells 13. Due to the diodes 31 equalizing currents between the battery strings 21 are prevented, so that the battery strings 21 are thus decoupled from each other.
  • FIG. 4 shows a basic circuit diagram of a battery 40 according to a second embodiment of the invention. For the sake of clarity, only one battery cell 13 is shown per battery string 21. However, in practical applications, a battery string 21 may include a plurality of battery cells
  • the diodes 31 prevent the flow of balancing currents between the battery strings 21. As is also sketched schematically in FIG. 4, the battery strings 21 are over one
  • the DC / DC converter unit 41 can be supplied, with the charging of the battery cells 13 is made possible.
  • the DC / DC converter unit 41 has means suitable
  • FIG. 5 shows an exemplary DC / DC converter unit 50 according to a third embodiment of the invention.
  • the DC / DC converter unit 50 here has a plurality of DC / DC converters 54, but may according to another
  • Embodiment alternatively be implemented with only one DC / DC converter 54.
  • the DC / DC converter unit 50 has two inputs 58, 59, with which the DC / DC converters 54 are connected in parallel at the beginning. Furthermore, the DC / DC converters 54 have outputs 55, 56. One of the outputs 55 of each DC / DC converter 54 is each connected to an output 57 of FIG. 5
  • DC / DC converter unit 50 are connected to the battery strings (not shown in Figure 5) of the battery.
  • the DC / DC converters 54 can each be connected via control inputs 53 to a control unit (not shown).
  • the DC / DC converter 54 via the control unit (not shown) selectively controlled.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Dc-Dc Converters (AREA)

Abstract

A battery is disclosed with a plurality of battery strings (21) connected in parallel, each of which has at least one battery cell (13). The battery has a circuit via which the battery cells (13) of the battery can be charged if a charge voltage is provided to the connections (14, 15) of the battery. At least one diode (31), connected in a forward direction with respect to a discharge current direction of the battery, is arranged on each of the battery strings (21) connected in parallel.

Description

Beschreibung Titel  Description title
Batterie mit einer Mehrzahl von parallel geschalteten Batteriesträngen und Verfahren zum Betreiben der Batterie  Battery with a plurality of battery strings connected in parallel and method for operating the battery
Die vorliegende Erfindung betrifft Batterie, die eine Mehrzahl von parallel geschalteten Batteriesträngen und eine Schaltung, über die die Batteriezellen der Batterie geladen werden können, aufweist. Außerdem betrifft die Erfindung ein Verfahren zum Betreiben der Batterie und ein Kraftfahrzeug, das mit der Batterie ausgestattet ist. The present invention relates to a battery having a plurality of battery strings connected in parallel and a circuit through which the battery cells of the battery can be charged. Moreover, the invention relates to a method for operating the battery and a motor vehicle that is equipped with the battery.
Stand der Technik State of the art
In stationären Energiespeichern wird typischerweise eine große Anzahl von In stationary energy storage is typically a large number of
Batteriezellen benötigt. Dabei werden für eine Batterie mit mehreren MWh Battery cells needed. This will be for a battery with several MWh
Energieinhalt beispielsweise mehrere Tausend Batteriezellen miteinander verschaltet, wobei die Anzahl der Zellen mit kleiner werdender Zellenkapazität ansteigt. Ferner ist es für Anwendungen, die einen großen Energiespeicher erfordern, häufig insbesondere auch erforderlich, mehr Zellen als zur Erreichung der geforderten Ausgangsspannung eigentlich notwendig sind, zu verbauen. Die Batteriezellen können seriell und/oder parallel verschaltet sein, wobei oft eine Kombination aus einer Reihenschaltung und einer Parallelschaltung angewendet wird. Typischerweise weisen die Konfigurationen entweder mehrere parallel verschaltete Batteriezellen oder mehrere parallele Batteriestränge auf. Energy content, for example, several thousand battery cells connected together, the number of cells increases with decreasing cell capacity. Furthermore, for applications which require a large energy storage, it is often necessary in particular also to install more cells than are actually necessary for achieving the required output voltage. The battery cells can be connected in series and / or in parallel, often using a combination of a series connection and a parallel connection. Typically, the configurations either comprise a plurality of parallel connected battery cells or multiple parallel battery strings.
So findet man bei der Verwendung vieler Zellen meist eine der in den Figuren 1 und 2 gezeigten Konfigurationen. Dabei wird gemäß Figur 1 eine Thus, when using many cells, one usually finds one of the configurations shown in FIGS. 1 and 2. In this case, according to Figure 1 a
Parallelschaltung 10 von Batteriesträngen 1 1 gezeigt, bei der zunächst viele Batteriezellen 13 in Serie verschaltet werden und die sich daraus ergebenden Batteriestränge 1 1 anschließend parallel geschaltet werden. Alternativ kann eine Parallelschaltung 21 von Batteriezellen vorgenommen werden, und anschließend eine Serienschaltung 22 der parallel geschalteten Batteriezellen, so dass sich eine Schaltungstopologie 20 wie in Figur 2 gezeigt ergibt. Wie bereits erwähnt, sind auch Mischkonfigurationen denkbar. Die Batteriespannung wird an den Anschlüssen 14, 15 zur Verfügung gestellt. Die Anschlüsse 14, 15 können ferner dazu dienen, eine Ladespannung zum Laden der Batterie anzuschließen. Parallel circuit 10 of battery strings 1 1 shown in the first many battery cells 13 are connected in series and the resulting battery strings 1 1 are then connected in parallel. Alternatively, a parallel connection 21 of battery cells can be made, and subsequently a series circuit 22 of the parallel-connected battery cells, so that a circuit topology 20 as shown in Figure 2 results. As already mentioned, mixed configurations are also conceivable. The battery voltage is provided at the terminals 14, 15. The terminals 14, 15 may further serve to connect a charging voltage for charging the battery.
Nachteilig an den bekannten Topologien ist jedoch, dass die einzelnen A disadvantage of the known topologies, however, is that the individual
Batteriezellen oder Batteriemodule, wenn ein Verbraucher angeschlossen wird, aufgrund der Toleranzen des Innenwiderstandes unterschiedlich stark belastet und damit unterschiedlich stark entladen werden. Bei einer Änderung der Belastung entstehen somit unerwünschte Ausgleichsströme zwischen den Zellen. Dadurch ergeben sich Verluste und die Lebensdauer der Zellen verringert sich. Battery cells or battery modules, when a consumer is connected, due to the tolerances of the internal resistance differently loaded and thus different levels of discharge. When the load is changed, unwanted equalization currents thus arise between the cells. This results in losses and the life of the cells is reduced.
Da sich ferner die Batteriezellen eines Batteriesystems oder einer Batterie über die Lebensdauer des Batteriesystems oder der Batterie im Allgemeinen unterschiedlich verhalten, kommt es bei solchen, wie oben beschriebenen insbesondere älteren Batterien oder Batteriesystemen zu Ausgleichsströmen zwischen den einzelnen Batteriesträngen oder Batteriemodulen, die noch zusätzliche Verluste erzeugen und darüber hinaus die Batteriezellenalterung noch zusätzlich beschleunigen. Further, since the battery cells of a battery system or a battery generally behave differently over the life of the battery system or battery, such as described above, especially older batteries or battery systems, there will be equalization currents between the individual battery strings or battery modules, which will generate additional losses and additionally accelerate battery cell aging.
Aus dem Dokument DE 10 2009 028 977 A1 ist ein Batteriesystem bekannt, bei dem eine Vielzahl von Batteriemodulen zwecks Ladungsausgleich über eine elektrische Verbindung miteinander gekoppelt ist. Zusätzlich sind die A battery system is known from the document DE 10 2009 028 977 A1, in which a multiplicity of battery modules are coupled to one another via an electrical connection for the purpose of charge equalization. In addition, the
Batteriemodule über jeweils dazwischengeschaltete DC/DC-Wandler parallel oder in Reihe geschaltet, so dass eine Einstellung einer gewünschten Battery modules via each interposed DC / DC converter connected in parallel or in series, so that a setting of a desired
Ausgangsspannung ermöglicht wird. Bei ungleicher Spannung zwischen den Batteriemodulen fließen durch die elektrische Verbindungen Ausgleichsströme, die die Spannung zwischen den Batteriemodulen aneinander angleichen. Output voltage is enabled. With unequal voltage between the battery modules through the electrical connections equalizing currents flow, which align the voltage between the battery modules together.
Lediglich bei gleicher Spannung aller Batteriemodule, das heißt im Only at the same voltage of all battery modules, that is in the
ausgeglichenen Ladungszustand, fließen keine Ausgleichsströme. Offenbarung der Erfindung balanced charge state, no compensation currents flow. Disclosure of the invention
Erfindungsgemäß wird eine spezielle Batterie mit einer Mehrzahl von parallel geschalteten Batteriesträngen, von denen jeder mindestens eine Batteriezelle aufweist, geschaffen. Die Batterie weist eine Schaltung auf, über die die According to the invention, a special battery is provided with a plurality of battery strings connected in parallel, each of which has at least one battery cell. The battery has a circuit through which the
Batteriezellen der Batterie geladen werden können, wenn eine Ladespannung an den Anschlüssen der Batterie bereitgestellt wird. Ferner ist in jedem der parallel geschalteten Batteriestränge mindestens eine bezüglich einer Battery cells of the battery can be charged when a charging voltage is provided to the terminals of the battery. Further, in each of the battery strings connected in parallel, at least one of them is one
Entladestromrichtung der Batterie in Durchlassrichtung geschaltete Diode angeordnet. Discharge current direction of the battery arranged in the forward direction diode arranged.
Ferner wird ein dazugehöriges Verfahren zum Betreiben der Batterie zur Verfügung gestellt. Furthermore, an associated method for operating the battery is provided.
Vorteile der Erfindung Advantages of the invention
Ein Vorteil der Erfindung ist, dass auf eine einfache und günstige Weise eine Entkopplung der Batteriestränge voneinander erreicht wird. So werden unerwünschte Ausgleichsströme verhindert. Denn wegen der Sperrwirkung der Dioden in Rückwärtsrichtung fließt kein Strom in die Zellen hinein. Es werden die in Serie geschalteten Batteriezellen über die erfindungsgemäßen Dioden mit einer Last verbunden, so dass über die Dioden die Energie den einzelnen Strängen entkoppelt voneinander entnommen wird. An advantage of the invention is that decoupling of the battery strings from one another is achieved in a simple and favorable manner. This prevents unwanted equalizing currents. Because of the blocking effect of the diodes in the reverse direction, no current flows into the cells. The series-connected battery cells are connected via the diodes according to the invention with a load, so that the energy is taken from the individual strands decoupled from each other via the diodes.
Gemäß einer Weiterbildung der Erfindung weist die Batterie mindestens einen DC/DC-Wandler auf, über den Batteriezellen geladen werden können. According to one embodiment of the invention, the battery has at least one DC / DC converter, via which battery cells can be charged.
Damit wird eine besonders vorteilhafte und flexible Möglichkeit zum Laden der Batteriezellen der erfindungsgemäßen Batterie bereitgestellt. This provides a particularly advantageous and flexible possibility for charging the battery cells of the battery according to the invention.
Bevorzugt wird der mindestens eine DC/DC-Wandler eingangsseitig mit den Eingangsterminals der Batterie parallel geschaltet. Dabei können ein Eingang des DC/DC-Wandlers und ein Ausgang des DC/DC-Wandlers miteinander verbunden sein. Gemäß einer Ausführungsform ist ferner ein Ausgang des DC/DC-Wandlers mit der Anode von mindestens einer der Dioden gekoppelt. Die Dioden der Preferably, the at least one DC / DC converter is connected in parallel with the input terminals of the battery on the input side. In this case, an input of the DC / DC converter and an output of the DC / DC converter can be connected to one another. According to one embodiment, an output of the DC / DC converter is further coupled to the anode of at least one of the diodes. The diodes of
DC/DC-Wandler können mit einem positiven Terminal der Batterie verbunden sein. DC / DC converters can be connected to a positive terminal of the battery.
Ferner kann der DC/DC-Wandler als Abwärtswandler oder als Aufwärtswandler ausgebildet sein. Furthermore, the DC / DC converter can be designed as a down converter or as a step-up converter.
Gemäß einer besonders bevorzugten Ausführungsform der Erfindung weist die Batterie eine Mehrzahl der erfindungsgemäßen DC/DC-Wandler auf, die eingangsseitig parallel geschaltet sind. So kann beispielsweise pro Batteriestrang ein DC/DC-Wandler vorgesehen sein. According to a particularly preferred embodiment of the invention, the battery has a plurality of DC / DC converters according to the invention, which are connected in parallel on the input side. Thus, for example, one DC / DC converter can be provided per battery string.
Die Erfindung kann vorteilhaft insbesondere bei einer Batterie angewandt werden, die eine Reihenschaltung von Batteriemodulen aufweist, von denen mindestens eine Parallelschaltung aus Batteriesträngen oder Batteriezellen besteht. The invention can advantageously be applied in particular to a battery which has a series connection of battery modules, of which at least one parallel circuit consists of battery strings or battery cells.
Erfindungsgemäß kann das Batteriesystem eine Lithium-Ionen-Batterie aufweisen. According to the invention, the battery system may comprise a lithium-ion battery.
Gemäß noch einem Aspekt der Erfindung wird außerdem ein Kraftfahrzeug bereitgestellt, das die erfindungsgemäße Batterie aufweist, die in einem According to yet another aspect of the invention, there is also provided a motor vehicle having the battery of the present invention which is incorporated in a vehicle
Antriebsstrang des Kraftfahrzeugs angeordnet ist. Powertrain of the motor vehicle is arranged.
Die Erfindung ist aber auch insbesondere bei stationären The invention is also particularly in stationary
Energiespeichereinrichtungen vorteilhaft einsetzbar. Energy storage devices advantageously used.
Vorteilhafte Weiterbildungen der Erfindung sind in den Unteransprüchen angegeben und in der Beschreibung beschrieben. Advantageous developments of the invention are specified in the subclaims and described in the description.
Zeichnungen drawings
Ausführungsbeispiele der Erfindung werden anhand der Zeichnungen und der nachfolgenden Beschreibung näher erläutert. Es zeigen: Figur 1 eine Batterie mit mehreren parallel geschalteten Batteriesträngen nach dem Stand der Technik, Embodiments of the invention will be explained in more detail with reference to the drawings and the description below. Show it: 1 shows a battery with several parallel-connected battery strings according to the prior art,
Figur 2 ein Batteriesystem mit mehreren in Reihe geschalteten Figure 2 shows a battery system with several series connected
Parallelschaltungen von Batteriemodulen nach dem Stand der Technik, Parallel circuits of battery modules according to the prior art,
Figur 3 eine Parallelschaltung von Batteriesträngen einer Batterieschaltung nach einer ersten Ausführungsform der Erfindung, Figur 4 ein Prinzipschaltbild einer Batterie nach einer zweiten Ausführungsform der Erfindung, und FIG. 3 shows a parallel connection of battery strings of a battery circuit according to a first embodiment of the invention, FIG. 4 shows a basic circuit diagram of a battery according to a second embodiment of the invention, and FIG
Figur 5 eine DC/DC-Wandler-Einheit nach einer dritten Ausführungsform der Erfindung. Figure 5 shows a DC / DC converter unit according to a third embodiment of the invention.
In der Figur 3 ist eine Parallelschaltung von Batteriesträngen 21 einer In FIG. 3, a parallel connection of battery strings 21 is one
Batterieschaltung 30 nach einer ersten Ausführungsform der Erfindung gezeigt. Die Batteriestränge 21 weisen jeweils eine Vielzahl von Batteriezellen 13 auf. Aufgrund der Dioden 31 werden Ausgleichströme zwischen den Batteriesträngen 21 verhindert, so dass die Batteriestränge 21 also voneinander entkoppelt sind. Battery circuit 30 shown according to a first embodiment of the invention. The battery strings 21 each have a multiplicity of battery cells 13. Due to the diodes 31 equalizing currents between the battery strings 21 are prevented, so that the battery strings 21 are thus decoupled from each other.
In der Figur 4 ist ein Prinzipschaltbild einer Batterie 40 nach einer zweiten Ausführungsform der Erfindung gezeigt. Dabei ist der Übersicht halber pro Batteriestrang 21 nur eine Batteriezelle 13 dargestellt. Jedoch kann in praktischen Anwendungen ein Batteriestrang 21 eine Vielzahl von BatteriezellenFIG. 4 shows a basic circuit diagram of a battery 40 according to a second embodiment of the invention. For the sake of clarity, only one battery cell 13 is shown per battery string 21. However, in practical applications, a battery string 21 may include a plurality of battery cells
13 oder Batteriemodulen enthalten. Die Dioden 31 verhindern das Fließen von Ausgleichströmen zwischen den Batteriesträngen 21. Wie in der Figur 4 ferner schematisch skizziert ist, sind die Batteriestränge 21 über eine 13 or battery modules included. The diodes 31 prevent the flow of balancing currents between the battery strings 21. As is also sketched schematically in FIG. 4, the battery strings 21 are over one
DC/DC-Wandler-Einheit 41 versorgbar, mit der das Laden der Batteriezellen 13 ermöglicht wird. Die DC/DC-Wandler-Einheit 41 weist Mittel auf, geeigneteDC / DC converter unit 41 can be supplied, with the charging of the battery cells 13 is made possible. The DC / DC converter unit 41 has means suitable
Ladespannungen an den Eingängen und Ausgängen von den Batteriezellen 13 bereitzustellen. Gemäß Figur 4 ist die DC/DC-Wandler-Einheit 41 eingangsseitig mit den Anschlüssen 14, 15 der Batterie 40 parallel geschaltet und wird mit einer an den Anschlüssen 14, 15 bereitgestellten Spannung versorgt. In der Figur 5 ist eine beispielhafte DC/DC-Wandler-Einheit 50 nach einer dritten Ausführungsform der Erfindung gezeigt. Die DC/DC-Wandler-Einheit 50 weist hier mehrere DC/DC-Wandler 54 auf, kann aber gemäß einer anderen Charging voltages at the inputs and outputs of the battery cells 13 provide. According to FIG. 4, the DC / DC converter unit 41 is connected in parallel with the terminals 14, 15 of the battery 40 on the input side and is supplied with a voltage provided at the terminals 14, 15. FIG. 5 shows an exemplary DC / DC converter unit 50 according to a third embodiment of the invention. The DC / DC converter unit 50 here has a plurality of DC / DC converters 54, but may according to another
Ausführungsform alternativ auch mit nur einem DC/DC-Wandler 54 implementiert sein. Gemäß Figur 5 hat die DC/DC-Wandler-Einheit 50 zwei Eingänge 58, 59, mit denen die DC/DC-Wandler 54 eingangs parallel geschaltet sind. Ferner weisen die DC/DC-Wandler 54 Ausgänge 55, 56 auf. Einer von den Ausgängen 55 jedes DC/DC-Wandlers 54 ist jeweils mit einem Ausgang 57 der Embodiment alternatively be implemented with only one DC / DC converter 54. According to FIG. 5, the DC / DC converter unit 50 has two inputs 58, 59, with which the DC / DC converters 54 are connected in parallel at the beginning. Furthermore, the DC / DC converters 54 have outputs 55, 56. One of the outputs 55 of each DC / DC converter 54 is each connected to an output 57 of FIG
DC/DC-Wandler-Einheit 50 verbunden. Die Ausgänge der DC / DC converter unit 50 connected. The outputs of the
DC/DC-Wandler-Einheit 50 sind mit den Batteriesträngen (in Figur 5 nicht dargestellt) der Batterie verbunden. Die DC/DC-Wandler 54 können über Steuereingänge 53 jeweils mit einer Steuereinheit (nicht dargestellt) verbunden sein. Bevorzugt sind die DC/DC-Wandler 54 über die Steuereinheit (nicht dargestellt) selektiv ansteuerbar. DC / DC converter unit 50 are connected to the battery strings (not shown in Figure 5) of the battery. The DC / DC converters 54 can each be connected via control inputs 53 to a control unit (not shown). Preferably, the DC / DC converter 54 via the control unit (not shown) selectively controlled.

Claims

Ansprüche claims
Batterie mit einer Mehrzahl von parallel geschalteten Batteriesträngen (21 ), von denen jeder mindestens eine Batteriezelle (13) aufweist, und einer Schaltung, über die die Batteriezellen (13) der Batterie geladen werden können, wenn eine Ladespannung an den Anschlüssen (14, 15) der Batterie bereitgestellt wird, gekennzeichnet dadurch, dass in jedem der parallel geschalteten Batteriestränge (21 ) mindestens eine bezüglich einer Battery having a plurality of battery strings (21) connected in parallel, each having at least one battery cell (13), and a circuit through which the battery cells (13) of the battery can be charged when a charging voltage at the terminals (14, 15 ) of the battery is provided, characterized in that in each of the parallel connected battery strings (21) at least one with respect to a
Entladestromrichtung der Batterie in Durchlassrichtung geschaltete Diode (31 ) angeordnet ist.  Discharge current direction of the battery in the forward direction switched diode (31) is arranged.
Batterie nach Anspruch 1 , aufweisend mindestens einen DC/DC-Wandler (54), über den Batteriezellen (13) der Batterie geladen werden können. A battery according to claim 1, comprising at least one DC / DC converter (54) via which battery cells (13) of the battery can be charged.
Batterie nach Anspruch 1 oder 2, wobei der mindestens eine A battery according to claim 1 or 2, wherein the at least one
DC/DC-Wandler (54) eingangsseitig mit den Anschlüssen (14, 15) der Batterie parallel geschaltet ist.  DC / DC converter (54) on the input side with the terminals (14, 15) of the battery is connected in parallel.
Batterie nach einem der vorhergehenden Ansprüche, wobei ein Ausgang (56) des DC/DC-Wandlers (54) mit der Anode von mindestens einer der Dioden (31 ) gekoppelt ist. A battery according to any one of the preceding claims, wherein an output (56) of the DC / DC converter (54) is coupled to the anode of at least one of the diodes (31).
Batterie nach einem der vorhergehenden Ansprüche, wobei ein Eingang (51 ) des DC/DC-Wandlers (54) und ein Ausgang (56) des DC/DC-Wandlers (54) miteinander verbunden sind. A battery according to any one of the preceding claims, wherein an input (51) of the DC / DC converter (54) and an output (56) of the DC / DC converter (54) are interconnected.
Batterie nach einem der vorhergehenden Ansprüche, wobei der A battery according to any one of the preceding claims, wherein the
DC/DC-Wandler (54) als Abwärtswandler oder als Aufwärtswandler ausgebildet ist. DC / DC converter (54) is designed as a down converter or as a step-up converter.
7. Batterie nach einem der vorhergehenden Ansprüche, aufweisend eine Mehrzahl von DC/DC-Wandlern (54), über die Batteriezellen (13) der Batterie geladen werden können und die eingangsseitig parallel geschaltet sind. 7. Battery according to one of the preceding claims, comprising a plurality of DC / DC converters (54) via which battery cells (13) of the battery can be charged and the input side are connected in parallel.
8. Batterie nach einem der vorhergehenden Ansprüche, wobei der 8. Battery according to one of the preceding claims, wherein the
DC/DC-Wandler (54) in einer DC/DC-Wandler-Einheit (41 ) angeordnet ist.  DC / DC converter (54) is arranged in a DC / DC converter unit (41).
9. Verfahren zum Betreiben einer Batterie, die mehrere parallel geschaltete Batteriestränge (21 ) mit jeweils mindestens einer Batteriezelle (13) aufweist, wobei beim Entladen der Batterie die Batteriestränge (21 ) jeweils mittels von einer bezüglich einer Entladestromrichtung in Durchlassrichtung 9. A method for operating a battery having a plurality of parallel connected battery strings (21) each having at least one battery cell (13), wherein when discharging the battery, the battery strings (21) each by means of a respect to a discharge in the forward direction
geschalteten Diode (31 ) entkoppelt werden und wobei zum Laden der Batterie mindestens ein DC/DC-Wandler (54) angesteuert wird, eine Ladespannung an mindestens einen zu ladenden Batteriezellenstrang (21 ) bereitzustellen.  switched diode (31) are decoupled and wherein for charging the battery at least one DC / DC converter (54) is driven to provide a charging voltage to at least one to be charged battery cell strand (21).
10. Kraftfahrzeug, aufweisend die Batterie nach einem der Ansprüche 1 bis 8, die in einem Antriebsstrang des Kraftfahrzeugs angeordnet ist. 10. Motor vehicle, comprising the battery according to one of claims 1 to 8, which is arranged in a drive train of the motor vehicle.
PCT/EP2013/055393 2012-03-28 2013-03-15 Battery with a plurality of battery strings connected in parallel and method for operating the battery WO2014023441A1 (en)

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