DE102019127179A1 - Method for determining the state of charge of a low-voltage battery of a motor vehicle - Google Patents
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- 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
- B60L1/00—Supplying electric power to auxiliary equipment of vehicles
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- 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
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
-
- 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
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
- B60L58/12—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to state of charge [SoC]
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- 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
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
- B60L58/18—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries of two or more battery modules
- B60L58/20—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries of two or more battery modules having different nominal voltages
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/385—Arrangements for measuring battery or accumulator variables
- G01R31/387—Determining ampere-hour charge capacity or SoC
- G01R31/388—Determining ampere-hour charge capacity or SoC involving voltage measurements
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
- H01M10/482—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for several batteries or cells simultaneously or sequentially
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- 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
- B60L2210/00—Converter types
- B60L2210/10—DC to DC converters
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- 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
- B60L2240/00—Control parameters of input or output; Target parameters
- B60L2240/40—Drive Train control parameters
- B60L2240/54—Drive Train control parameters related to batteries
- B60L2240/547—Voltage
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
- H01M2010/4271—Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2220/00—Batteries for particular applications
- H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
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- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- 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
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- 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
- Y02T10/72—Electric energy management in electromobility
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Abstract
Die Erfindung betrifft ein Verfahren zur Ladezustandsbestimmung einer Batterie, insbesondere einer Niederspannungsbatterie (14), eines Kraftfahrzeugs (2), mit den Schritten:(S100) Erfassen einer Inbetriebnahme (IB) des Kraftfahrzeugs (2),(S300) auf das Erfassen der Inbetriebnahme (IB) des Kraftfahrzeugs (2) hin Erzeugen eines Messsignals (MS) für eine elektrochemische Impedanzspektroskopie mit einem Gleichspannungswandler (10) des Kraftfahrzeugs (2), und(S400) Auswerten der von dem Gleichspannungswandler (10) bereitgestellten elektrischen Ausgangsspannung und der elektrischen Klemmenspannung der Batterie um den Ladezustand (LZ) der Batterie zu bestimmen.The invention relates to a method for determining the state of charge of a battery, in particular a low-voltage battery (14), of a motor vehicle (2), with the following steps: (S100) detection of a start-up (IB) of the motor vehicle (2), (S300) on the detection of start-up (IB) of the motor vehicle (2) generating a measurement signal (MS) for electrochemical impedance spectroscopy with a DC voltage converter (10) of the motor vehicle (2), and (S400) evaluating the electrical output voltage provided by the DC voltage converter (10) and the electrical terminal voltage of the battery to determine the state of charge (LZ) of the battery.
Description
Die Erfindung betrifft ein Verfahren zur Ladezustandsbestimmung einer Niederspannungsbatterie eines Kraftfahrzeugs.The invention relates to a method for determining the state of charge of a low-voltage battery of a motor vehicle.
Die Niederspannungsbatterie (auch Starterbatterie, Autobatterie oder Fahrzeugbatterie), ist ein Akkumulator, der unter anderem elektrische Energie für einen Anlasser einer Brennkraftmaschine des Kraftfahrzeugs liefert oder Ruheströme versorgt. Die Niederspannungsbatterie kann als Pufferspeicher für ein Bordnetz, z.B. ein 12-Volt-Bordnetz, des Kraftfahrzeugs dienen. Die Niederspannungsbatterie kann auch für Spannungslagen bis 60 V ausgelegt sein, z.B. mit 24 V oder 48 V Nennspannung.The low-voltage battery (also starter battery, car battery or vehicle battery) is an accumulator which, among other things, supplies electrical energy for a starter of an internal combustion engine of the motor vehicle or supplies quiescent currents. The low-voltage battery can serve as a buffer store for an on-board network, e.g. a 12-volt on-board network, of the motor vehicle. The low-voltage battery can also be designed for voltage levels up to 60 V, e.g. with 24 V or 48 V nominal voltage.
Eine Niederspannungsbatterie ist ein Energiespeicher, der aus mehreren zusammengeschalteten Elementen (daher „Batterie“) besteht. Sie besteht aus parallel und seriell zusammengeschalteten Akkumulator-Zellen oder ZellblöckenA low-voltage battery is an energy storage device that consists of several interconnected elements (hence “battery”). It consists of accumulator cells or cell blocks connected in parallel and in series
Die Niederspannungsbatterie kann eine Lithium-Ionen-Batterie sein, d.h. eine Batterie auf der Basis von Lithium-Verbindungen in allen drei Phasen einer elektrochemischen Zelle. Die Batterie kann aber auch eine Bleibatterie, NiMH-Batterie oder eine Feststoffbatterie sein.The low-voltage battery can be a lithium-ion battery, i.e. a battery based on lithium compounds in all three phases of an electrochemical cell. However, the battery can also be a lead-acid battery, NiMH battery or a solid-state battery.
Insbesondere bei einer Anwendung in hochautomatisierten Kraftfahrzeugen, sogenannten Roboterautos, ist eine genaue Bestimmung des Ladezustands der Niederspannungsbatterie aus Sicherheitsgründen und zur Sicherstellung eines zuverlässigen Betriebs erforderlich.Particularly when used in highly automated motor vehicles, so-called robot cars, an exact determination of the charge state of the low-voltage battery is necessary for safety reasons and to ensure reliable operation.
Batteriemanagementsysteme (BMS) werten zur Bestimmung des Ladezustands unter anderem die Leerlaufspannung der Batterie, die in die Batterie hineinfließenden und herausfließenden elektrischen Ströme sowie die Spannung unter Last aus. Bei einigen Batterietypen ist die Steigung der Leerlaufspannung gegenüber dem Ladezustand sehr flach, was eine genaue Ladezustandsbestimmung der Niederspannungsbatterie erschwert.To determine the state of charge, battery management systems (BMS) evaluate, among other things, the open-circuit voltage of the battery, the electrical currents flowing into and out of the battery and the voltage under load. With some battery types, the slope of the open circuit voltage is very flat compared to the state of charge, which makes it difficult to determine the exact state of charge of the low-voltage battery.
Systeme zur Bestimmung eines Ladezustands sind z.B. aus der
Es besteht also Bedarf daran, Wege aufzuzeigen, wie die Ladezustandserfassung von Niederspannungsbatterien eines Kraftfahrzeugs verbessert werden kann.There is therefore a need to show ways in which the detection of the state of charge of low-voltage batteries in a motor vehicle can be improved.
Die Aufgabe wird gelöst durch die Erfindung eines Verfahrens zur Ladezustandsbestimmung einer Niederspannungsbatterie eines Kraftfahrzeugs mit den Schritten:
- Erfassen einer Inbetriebnahme des Kraftfahrzeugs,
- auf das Erfassen der Inbetriebnahme des Kraftfahrzeugs hin Erzeugen eines Messsignals für eine elektrochemische Impedanzspektroskopie mit einem Gleichspannungswandler des Kraftfahrzeugs, und
- Auswerten der von dem Gleichspannungswandler bereitgestellten elektrischen Ausgangsspannung und der elektrischen Klemmenspannung der Batterie um den Ladezustand der Niederspannungsbatterie zu bestimmen.
- Recording the start-up of the motor vehicle,
- in response to the detection of the start-up of the motor vehicle, generating a measurement signal for electrochemical impedance spectroscopy with a DC voltage converter of the motor vehicle, and
- Evaluation of the electrical output voltage provided by the DC / DC converter and the electrical terminal voltage of the battery in order to determine the state of charge of the low-voltage battery.
Das Verfahren startet also mit der Inbetriebnahme des Kraftfahrzeugs, die einen Selbsttest diverser Komponenten des Kraftfahrzeugs auf ihre Funktionsfähigkeit umfasst. Derartige Selbst- oder Funktionstests können zusätzlich oder alternativ auch während kurzer Stopps, wie z.B. an einer Ampel, durchgeführt werden. Zu diesem Selbsttest gehört auch die Ladezustandsbestimmung der Batterie, z.B. der Niederspannungsbatterie des Kraftfahrzeugs mittels elektrochemischer Impedanzspektroskopie.The method therefore starts with the commissioning of the motor vehicle, which includes a self-test of various components of the motor vehicle for their functionality. Such self-tests or function tests can additionally or alternatively also be carried out during short stops, e.g. at a traffic light. This self-test also includes determining the state of charge of the battery, e.g. the low-voltage battery of the motor vehicle, using electrochemical impedance spectroscopy.
Es wird also ein Gleichspannungswandler, der im Normalbetrieb, d.h. nach der Inbetriebnahme, die elektrische Gleichspannung ,z.B. einer Traktionsbatterie eines elektrisch angetriebenen Fahrzeugs (BEV) oder Hybridfahrzeugs (HEV), auf einen anderen, niedrigeren Wert wandelt, verwendet, um das Messsignal für die elektrochemische Impedanzspektroskopie bereitzustellen. Hierzu kann ausgenutzt werden, dass der Gleichspannungswandler die elektrische Gleichspannung, z.B. einer Traktionsbatterie, in einem Zwischenkreis in Wechselspannung wandelt, diese dabei hoch- oder runter transformiert und anschließend wieder gleichrichtet. Auf die Gleichspannung wird dann eine elektrische Wechselspannung aufmoduliert, die zur Impedanzspektroskopie verwendet wird. So kann auf einen zusätzlichen Wechselrichter zur Messsignalerzeugung verzichtet und zugleich die Ladezustandserfassung der Niederspannungsbatterie des Kraftfahrzeugs verbessert werden.So there is a DC voltage converter, which in normal operation, i.e. after commissioning, the electrical DC voltage, e.g. a traction battery of an electrically powered vehicle (BEV) or hybrid vehicle (HEV), converts to a different, lower value, used to provide the measurement signal for the electrochemical impedance spectroscopy. For this purpose, it can be used that the DC voltage converter converts the electrical DC voltage, e.g. a traction battery, in an intermediate circuit into AC voltage, transforms it up or down and then rectifies it again. An electrical alternating voltage, which is used for impedance spectroscopy, is then modulated onto the direct voltage. An additional inverter for generating the measurement signal can thus be dispensed with and, at the same time, the detection of the state of charge of the low-voltage battery of the motor vehicle can be improved.
Gemäß einer Ausführungsform werden zusätzlich elektrische Eingangs- und Ausgangsströme des Gleichspannungswandlers und der Batterie erfasst und ausgewertet um den Ladezustand der Batterie zu bestimmen. Mit anderen Worten, es erfolgt eine Ladezustandsbestimmung durch eine Amperestundenbilanzierung. Es wird also vorzeichenbehaftet die in der Batterie gespeicherte und entnommene elektrische Ladungsmenge erfasst. So kann die Genauigkeit der Bestimmung des Ladezustands der Niederspannungsbatterie gesteigert werden.According to one embodiment, electrical input and output currents of the DC / DC converter and the battery are additionally recorded and evaluated in order to determine the state of charge of the battery. In other words, the state of charge is determined using an ampere-hour balance. The amount of electrical charge stored and withdrawn in the battery is thus recorded with a signed sign. So can the Accuracy of determining the state of charge of the low-voltage battery can be increased.
Gemäß einer weiteren Ausführungsform wird zusätzlich eine Leerlaufspannung der Batterie erfasst und ausgewertet um den Ladezustand der Batterie zu bestimmen. Hierzu kann eine elektrische Ruhespannungskennlinie vorab aufgenommen und z.B. in Form einer Lookup Tabelle im Batteriemanagementsystem hinterlegt werden. Dabei wird der Umstand ausgenutzt, dass ein injektiver bzw. streng monotoner Zusammenhang zwischen der elektrischen Ruhespannung und dem Ladezustand der Batterie besteht. Unter der elektrischen Ruhespannung wird der Spannungswert verstanden, der sich nach einer vorbestimmten Wartezeit einstellt. Nach Ablauf dieser Wartezeit befindet sich das elektrochemische System der Niederspannungsbatterie in einem dynamischen Gleichgewicht bzw. in einem relaxierten Zustand, bei dem sich in diesem stromlosen Zustand alle auf vorhergehende Ladungen bzw. Entladungen beruhenden Überspannungen abgebaut sind. So kann die Genauigkeit der Bestimmung des Ladezustands der Niederspannungsbatterie nochmals gesteigert werden.According to a further embodiment, an open circuit voltage of the battery is additionally recorded and evaluated in order to determine the state of charge of the battery. For this purpose, an electrical open-circuit voltage characteristic can be recorded in advance and stored in the battery management system, for example in the form of a lookup table. This takes advantage of the fact that there is an injective or strictly monotonic relationship between the electrical open-circuit voltage and the state of charge of the battery. The electrical no-load voltage is understood to be the voltage value that occurs after a predetermined waiting time. After this waiting time has elapsed, the electrochemical system of the low-voltage battery is in a dynamic equilibrium or in a relaxed state, in which, in this currentless state, all overvoltages based on previous charges or discharges are reduced. In this way, the accuracy of determining the state of charge of the low-voltage battery can be increased again.
Gemäß einer weiteren Ausführungsform werden zur Bestimmung des Ladezustandes der Niederspannungsbatterie der Gleichspannungswandler und die Niederspannungsbatterie galvanisch von einer elektrischen Last des Kraftfahrzeugs getrennt. Hierzu kann ein ansteuerbarer Trennschalter geöffnet werden. So wird sichergestellt, dass die Last nicht die Bestimmung des Ladezustands der Niederspannungsbatterie verfälscht oder beeinflusst.According to a further embodiment, to determine the state of charge of the low-voltage battery, the DC-DC converter and the low-voltage battery are galvanically separated from an electrical load of the motor vehicle. A controllable isolating switch can be opened for this purpose. This ensures that the load does not falsify or influence the determination of the state of charge of the low-voltage battery.
Ferner gehören zur Erfindung ein Computerprogrammprodukt, ein Batteriemanagementsystem und ein Gleichspannungswandler sowie ein Kraftfahrzeug mit einem derartigen Batteriemanagementsystem und einem derartigen Gleichspannungswandler.The invention also includes a computer program product, a battery management system and a DC voltage converter, as well as a motor vehicle with such a battery management system and such a DC voltage converter.
Es wird nun die Erfindung anhand einer Zeichnung erläutert. Es zeigen:
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1 in schematischer Darstellung Komponenten eines Kraftfahrzeugs mit einer Niederspannungsbatterie, einem Gleichspannungswandler und einer Traktionsbatterie. -
2 in schematischer Darstellung einen Verfahrensablauf zum Betrieb der in1 gezeigten Komponenten.
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1 a schematic representation of components of a motor vehicle with a low-voltage battery, a DC voltage converter and a traction battery. -
2 a schematic representation of a process sequence for operating the in1 components shown.
Es wird zunächst auf
Dargestellt sind Komponenten eines Kraftfahrzeugs
Das Kraftfahrzeug
Weitere, dargestellte Komponenten sind ein Batteriemanagementsystem
Das Batteriemanagementsystem
Um eine Ladezustandsbestimmung durchzuführen ist das Batteriemanagementsystem
Dabei wird unter einer elektrochemischen Impedanzspektroskopie (oft mit EIS abgekürzt) die Bestimmung einer Impedanz, d.h. eines Wechselstromwiderstands, elektrochemischer Systeme als Funktion der Frequenz einer Wechselspannung bzw. des Wechselstroms verstanden. Das elektrochemische System sind im vorliegenden Ausführungsbeispiel die Zellen der Niederspannungsbatterie
Das Batteriemanagementsystem
Der Gleichspannungswandler
Die grundlegende Funktionsweise von dem Gleichspannungswandler
Der Gleichspannungswandler
Hierzu erfolgt ein Abgriff einer elektrischen Wechselspannung vor einem ausgangsseitigen Gleichrichter des Gleichspannungswandlers
Ferner ist das Batteriemanagementsystem
Des Weiteren ist das Batteriemanagementsystem
Die Last
Der Trennschalter
Es wird nun unter zusätzlicher Bezugnahme auf
In einem ersten Schritt S100 erfasst das Batteriemanagementsystem
Wenn eine Inbetriebnahme
In einem weiteren Schritt S300 erzeugt das Batteriemanagementsystem
In einem weiteren Schritt S400 wertet das Batteriemanagementsystem
Zusätzlich kann vorgesehen sein, dass das Batteriemanagementsystem
Abweichend vom vorliegenden Ausführungsbeispiel kann die Reihenfolge der Schritte auch eine andere sein. Ferner können mehrere Schritte auch zeitgleich bzw. simultan ausgeführt werden. Des Weiteren können auch einzelne Schritte ausgelassen bzw. übersprungen werden.In a departure from the present exemplary embodiment, the sequence of the steps can also be different. Furthermore, several steps can also be carried out at the same time or simultaneously. Furthermore, individual steps can also be omitted or skipped.
So kann auf einen Wechselrichter zur Messsignalerzeugung verzichtet und zugleich die Ladezustandserfassung einer Niederspannungsbatterie
BezugszeichenlisteList of reference symbols
- 22
- KraftfahrzeugMotor vehicle
- 44th
- BatteriemanagementsystemBattery management system
- 66th
- TraktionsbatterieTraction battery
- 88th
- Lastload
- 1010
- GleichspannungswandlerDC-DC converter
- 1212th
- TrennschalterDisconnector
- 1414th
- Niederspannungsbatterie Low voltage battery
- ASAS
- AnsteuersignalControl signal
- IBIB
- InbetriebnahmeInstallation
- LZLZ
- LadezustandState of charge
- MSMS
- MesssignalMeasurement signal
ZITATE ENTHALTEN IN DER BESCHREIBUNGQUOTES INCLUDED IN THE DESCRIPTION
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Zitierte PatentliteraturPatent literature cited
- US 20180203073 A1 [0007]US 20180203073 A1 [0007]
- US 20160003917 A1 [0007]US 20160003917 A1 [0007]
- US 9428071 B2 [0007]US 9428071 B2 [0007]
- US 20180364311 A1 [0007]US 20180364311 A1 [0007]
- US 9368841 B2 [0007]US 9368841 B2 [0007]
Claims (11)
Priority Applications (2)
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DE102019127179.7A DE102019127179A1 (en) | 2019-10-09 | 2019-10-09 | Method for determining the state of charge of a low-voltage battery of a motor vehicle |
CN202011057328.9A CN112649748A (en) | 2019-10-09 | 2020-09-29 | Method for determining the state of charge of a low-voltage battery of a motor vehicle |
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DE102019127179.7A DE102019127179A1 (en) | 2019-10-09 | 2019-10-09 | Method for determining the state of charge of a low-voltage battery of a motor vehicle |
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DE102019127179A1 true DE102019127179A1 (en) | 2021-04-15 |
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DE102019127179.7A Pending DE102019127179A1 (en) | 2019-10-09 | 2019-10-09 | Method for determining the state of charge of a low-voltage battery of a motor vehicle |
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CN (1) | CN112649748A (en) |
DE (1) | DE102019127179A1 (en) |
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CN113696781B (en) * | 2021-08-10 | 2023-07-25 | 岚图汽车科技有限公司 | New energy automobile OTA (over the air) upgrading storage battery capacity detection method and system |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20140125284A1 (en) * | 2012-10-30 | 2014-05-08 | Board Of Trustees Of The University Of Alabama | Distributed battery power electronics architecture and control |
DE102017201485A1 (en) * | 2017-01-31 | 2018-08-02 | Siemens Aktiengesellschaft | A method and arrangement for determining the charge capacity and health of an electrical energy store |
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2019
- 2019-10-09 DE DE102019127179.7A patent/DE102019127179A1/en active Pending
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2020
- 2020-09-29 CN CN202011057328.9A patent/CN112649748A/en active Pending
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20140125284A1 (en) * | 2012-10-30 | 2014-05-08 | Board Of Trustees Of The University Of Alabama | Distributed battery power electronics architecture and control |
DE102017201485A1 (en) * | 2017-01-31 | 2018-08-02 | Siemens Aktiengesellschaft | A method and arrangement for determining the charge capacity and health of an electrical energy store |
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