WO2016050403A1 - Battery management system and method for calibrating a sensor of a battery management system - Google Patents

Battery management system and method for calibrating a sensor of a battery management system Download PDF

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Publication number
WO2016050403A1
WO2016050403A1 PCT/EP2015/068266 EP2015068266W WO2016050403A1 WO 2016050403 A1 WO2016050403 A1 WO 2016050403A1 EP 2015068266 W EP2015068266 W EP 2015068266W WO 2016050403 A1 WO2016050403 A1 WO 2016050403A1
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WO
WIPO (PCT)
Prior art keywords
charging
current
sensor
battery
voltage
Prior art date
Application number
PCT/EP2015/068266
Other languages
German (de)
French (fr)
Inventor
Jens Becker
Jan Salziger
Michael Rueger
Triantafyllos Zafiridis
Andre Boehm
Marcus BOEGE
Original Assignee
Robert Bosch Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Priority to CN201580053623.8A priority Critical patent/CN106716168B/en
Publication of WO2016050403A1 publication Critical patent/WO2016050403A1/en

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
    • G01R35/005—Calibrating; Standards or reference devices, e.g. voltage or resistance standards, "golden" references
    • 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
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B60L53/10—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles characterised by the energy transfer between the charging station and the vehicle
    • B60L53/14—Conductive energy transfer
    • 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
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B60L53/30—Constructional details of charging stations
    • 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
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B60L53/60—Monitoring or controlling charging stations
    • B60L53/66—Data transfer between charging stations and vehicles
    • B60L53/665—Methods related to measuring, billing or payment
    • 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
    • H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
    • H02J7/0048—Detection of remaining charge capacity or state of charge [SOC]
    • 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
    • H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
    • H02J7/005—Detection of state of health [SOH]
    • 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
    • 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
    • B60L2240/549—Current
    • 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
    • B60L2260/00—Operating Modes
    • B60L2260/40—Control modes
    • B60L2260/44—Control modes by parameter estimation
    • 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]
    • G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
    • 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
    • H02J2310/00—The network for supplying or distributing electric power characterised by its spatial reach or by the load
    • H02J2310/40—The network being an on-board power network, i.e. within a vehicle
    • H02J2310/48—The network being an on-board power network, i.e. within a vehicle for electric vehicles [EV] or hybrid vehicles [HEV]
    • 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
    • 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
    • Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
    • 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
    • Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/10—Technologies relating to charging of electric vehicles
    • Y02T90/12—Electric charging stations
    • 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
    • Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/10—Technologies relating to charging of electric vehicles
    • Y02T90/14—Plug-in electric vehicles
    • 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
    • Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/10—Technologies relating to charging of electric vehicles
    • Y02T90/16—Information or communication technologies improving the operation of electric vehicles
    • Y02T90/167—Systems integrating technologies related to power network operation and communication or information technologies for supporting the interoperability of electric or hybrid vehicles, i.e. smartgrids as interface for battery charging of electric vehicles [EV] or hybrid vehicles [HEV]
    • 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
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S30/00—Systems supporting specific end-user applications in the sector of transportation
    • Y04S30/10—Systems supporting the interoperability of electric or hybrid vehicles
    • Y04S30/14—Details associated with the interoperability, e.g. vehicle recognition, authentication, identification or billing

Definitions

  • the invention relates to a method for calibrating a sensor of a battery management system during a charge of an associated battery at a charging station.
  • the invention further relates to a battery management system for a battery system having a battery, wherein the battery management system has a sensor which is suitable for detecting a charging parameter when charging the battery at a charging station.
  • Hybrid and electric vehicles use battery packs, often in Li-Ion technology, which consist of a large number of series-connected electrochemical cells.
  • a battery management system is used to monitor the battery pack, also referred to below as the battery, and in addition to a safety monitoring to ensure the longest possible life.
  • the battery management has various sensors for measuring, for example, current, voltage and temperature.
  • a current sensor for measuring a current flowing through the battery is of great importance, since a current value determined by it is generally used for determining the state of charge (SOC). In this case, the state of charge of the battery can be determined more precisely the more precisely an actually flowing current can be determined by the current sensor.
  • the monitoring of a continuous current emitted by the battery and of a peak current is often carried out by means of a current sensor.
  • the monitoring of which is relevant to safety and the amount of which can be decisive for the guarantee of the guarantee.
  • battery packs often have a voltage sensor for determining a pack voltage, which can be used to make the sum of the voltages of the series-connected electrochemical cells plausible.
  • the battery may have a voltage sensor for detecting a link voltage, which is the mains connection side behind a contactor, via which a
  • Network is connectable to the battery, can be measured. Based on a possible difference between a pack voltage and a link voltage, a diagnosis of the contactor can be made.
  • Such voltage sensors are usually calibrated installed in the battery during their production. Following this, usually no further calibration takes place, which compensates for possible age-related sensor value deviations.
  • From JP2013090473 an energy storage device and a method is known to detect abnormalities of a current sensor of a vehicle. For this purpose, a controller compares the detection values of first current sensors in the energy storage device and second current sensors in a charging device located on the vehicle, which is supplied via a charging cable from an external energy source.
  • JP 2012-080712 describes an in-vehicle vehicle charging device that allows charging of a vehicle battery even when a sensor provides an abnormal value.
  • the vehicle charging device has on the input side as on the output side sensors whose values of a
  • Error detection means are compared, so as to detect the detection error.
  • the charge transferred from a power source when charging a battery is determined by a product of time integrated with nem charging current and an associated charging voltage. Charging current and charging voltage are therefore also collectively referred to as charging parameters. Furthermore, in the following, currents and voltages which are detected by a sensor of the battery management system, referred to as I B MS and UBMS, as well as currents and voltages, which are determined by a stationary charging station, referred to as Istation or Ustation.
  • a method for calibrating a sensor of a battery management system wherein the sensor is suitable for detecting a charging parameter when charging an associated battery at a charging station.
  • the charging station detects the charge current Istation and / or the charging voltage Ustation, (ii) the charging parameter through the sensor of the battery management system in the form of a charging current I B MS or a charging measurement voltage U B MS detects, (iii) a measurement difference between the charge measurement current I B MS and the charge current Istation or the charge measurement voltage U B MS and the charge voltage Ustation determined and (iv) the determined measurement difference as a sensor correction value for calibration of the sensor used.
  • a first advantage is that a sensor of a battery management is verifiable.
  • a precisely determined amount of charge is delivered, not least for billing purposes.
  • the sensors for determining the amount of charge ie the sensors for determining the output charging current and the existing charging voltage Ustation must be calibrated.
  • Such a calibration is usually to be ensured by an operator of a charging station, for example by regular checks.
  • a measurement difference is determined from a charge measurement current I BM s determined by the battery management system and the charge current Istation or a charge measurement voltage U B MS and the charge voltage Ustation determined by the battery management system.
  • the method allows a comparison with a battery management not associated, and in the case of a vehicle battery not on board the vehicle and also usually calibrated current or voltage reference.
  • Another advantage of the method is that sensor errors are reliably detectable, whereby a check of the sensors is vorappelbar with each charge of the battery.
  • the inventive method thus offers the advantage of a regular sensor diagnosis without the need for time-consuming additional work.
  • the inventive method offers the advantage that a sensor of a battery management system regularly, i. at every charge, not only verifiable, but also calibratable.
  • the calibration also takes place without additional time, i. in the case of a vehicle battery, for example, without a workshop visit.
  • From a frequent implementation of the method i. On the basis of a frequently checked, possibly recalibrated and thus reliably detecting sensor of a battery management system, there are a number of further advantages.
  • the state of charge of the battery SOC state of charge
  • the aging state SOH State of Health
  • precise measurements allow the reduction of safety tolerances.
  • the implementation of the method advantageously takes place such that the value of the charging parameter from the charging station to the battery management system of the Battery is transmitted and the battery management system performs the calculation of the measurement difference.
  • Such an embodiment allows an efficient implementation of the method, since the method requires only a unidirectional data transmission method for transmitting the data from the station to the battery.
  • a determined measurement difference or a sensor correction value would have to be transmitted to the battery in a further transmission with a bidirectional data transmission method ,
  • the transmission is secured by a handshake protocol.
  • Handshake is generally understood as a receipt operation.
  • two subscribers participating in a data transmission synchronize themselves after each transmission process by means of immediate acknowledgment signals. Since the method intervenes in the determination of sensitive battery parameters, a faulty transmission of a charging parameter, which could lead to incorrect calibrations, can cause serious consequences.
  • a transmission of the charging parameter is therefore advantageously acknowledged by the battery.
  • the transfer advantageously takes place in a method which transmits the received value back to the sender or which contains information, e.g. a check digit used to verify the accuracy of the received data.
  • the method is advantageously carried out such that the value of the charging parameter changes over time and the sensor correction value is determined for different values of the charging parameter. Since a sensor error does not have to be constant over a range of values of the variable detected by the sensor, such an embodiment allows the creation of a value table (also called a lookuptable) or a correction characteristic curve, by means of which a corrected sensor value can be assigned to each sensor value determined.
  • a value table also called a lookuptable
  • a correction characteristic curve by means of which a corrected sensor value can be assigned to each sensor value determined.
  • a continuous or stepwise change in the value of the charging parameter allows at each step, first, a transmission of the value of the loading parameter, which in the following Time interval is set by the charging station. By repeating this procedure, a correction characteristic can be determined step by step.
  • there is a continuous change in the charging parameter in which a value of a charging parameter detected in the charging station is quasi continuously transmitted to the battery management system as a result of the transmission.
  • a constant charging current Istation requires a continuously increasing charging voltage Ustation.
  • a continuous transmission of the charging voltage Ustation allows a determination in the battery management system of an associated continuous charging measuring voltage U BM s.
  • a step-by-step change of a charging parameter takes place only after a successful handshake, since a faulty assignment of a supposed, optionally previously set charging parameter to a charging parameter actually set by the charging station can lead to incorrect calibrations.
  • the method is carried out in such a way that the measurement difference is compared with a threshold value above which error signaling takes place.
  • a threshold value above which error signaling takes place Such an implementation of the method makes it possible to detect both errors in the calibration and sensor defects and to signal.
  • a driver can be signaled the presence of an error.
  • the method is carried out with a charging voltage Ustation as a charging parameter.
  • the charging voltage Ustation is transmitted to the battery, for example.
  • the battery management system of the battery determines the charging measurement voltage U B MS via a voltage sensor to be calibrated and calculates the associated measurement difference AU. This is stored and used as sensor correction value UA. This is done, for example, by adding the sensor correction value UA to the value of a voltage U BM determined by the sensor.
  • the sensor correction value UA is not determined for a single voltage value U BM s but for at least a portion of its value range.
  • a respectively associated measuring difference AU is determined for the respective charging voltage Ustation.
  • This is stored in the form of a sensor correction characteristic UA (UBMS), so that an associated sensor correction value UA is available for a value UBMS determined by the voltage sensor.
  • UBMS sensor correction characteristic UA
  • the implementation of the method with a charging current Istation takes place as a charging parameter.
  • the charging current Istation is transmitted, for example, to the battery.
  • the battery management system of the battery determines the charging current I B Ms via a current sensor to be calibrated and calculates the associated measurement difference ⁇ . This is stored and used as sensor correction value ⁇ . This is done, for example, by adding the sensor correction value ⁇ to the value of a current l BM s determined by the sensor.
  • the sensor correction value ⁇ is not determined for a single current value l BM s but for at least a portion of its value range.
  • the charging current Istation is incrementally increased by the charging station, for example, by increasing or decreasing the charging voltage Ustation until an associated charging current Istation is established, a respectively associated measurement difference ⁇ is determined for the respective charging current.
  • This is stored in the form of a sensor correction characteristic IA (l BM s), so that an associated sensor correction value ⁇ is available for a value l BM s determined by the current sensor.
  • the method is carried out with a negative charging current Istation or a discharge current as a charging parameter.
  • a negative charging current Istation or a discharge current as a charging parameter.
  • a lowering of the charging voltage Ustation below the pack voltage or below the link voltage a reversal of the charging current Istation into a discharge current can be achieved, via the change of which a sensor correction characteristic IA (IBMS) can be determined in the same way.
  • IBMS sensor correction characteristic
  • the method is carried out to calibrate a sensor of a battery management system, which is used to determine the capacity the battery is used.
  • a determination of the capacitance based on a calibrated by this method sensor allows an accurate determination of their height, which allows, for example, a precise calculation of an available range or remaining range of a hybrid or electric vehicle.
  • the battery management system for a battery system having a battery, which has a sensor which is suitable to detect a charging parameter when the battery is charged at a charging station, it is provided that it is set up (i) the size of a battery when charging (ii) via the sensor to detect a charging current I B MS or a charging voltage U B MS as a charging parameter, (iii) a measuring difference from the charging current IBMS and the Charging current Istation or the charging voltage U B MS and the charging voltage Ustation to determine and (iv) to use the determined measurement difference as a sensor correction value for the calibration of the sensor.
  • the battery management system is in particular a battery management system for carrying out the above-mentioned method.
  • FIG. 1 shows an example of an arrangement of a battery system at a charging station for carrying out the method according to the invention
  • FIG. 2 shows an example of a time profile of a charging current Istation and a charging current I B MS in carrying out an embodiment of the method according to the invention
  • 3 shows an example of a function of a sensor correction value ⁇ as a function of a load measuring current I B MS;
  • FIG. 4 shows an example of a time profile of a charging voltage Ustation and a charging measuring voltage U B MS when carrying out an embodiment of the method according to the invention
  • FIG. 1 shows an example of an arrangement of a battery system 10 at a charging station 3 for performing an embodiment of the method according to the invention.
  • the battery system 10 has a battery 2, which is managed by a battery management system 1.
  • the battery management system 1 has a plurality of sensors, not shown here, for detecting voltages, for example the pack voltage as a voltage across the battery pack or, for example, the link voltage as a voltage at a consumer output of the battery 2.
  • the battery system 10 is charged by a charging station 3 via a charging cable 12.
  • a charging current Istation 4 at a charging voltage Ustation 5.
  • the charging current Istation 4 and the charging voltage Ustation 5 are adjustable by a control device 1 1 in the charging station 3.
  • Charging voltage Ustation 5 and charging current Istation 4 are detected in the charging station 3 by calibrated measuring instruments I and U.
  • a data connection 13 This can be performed both cordless and as a line.
  • Via the data connection 13 is a value of a charging parameter, for example the charging current Istation 4 or the charging voltage Ustation 5 from the charging station 3 to the battery management system 1 of the battery
  • the transmission may be through a handshake protocol between the battery management system 1 and the control device 1 1 are hedged.
  • the control device 1 1 is configured to change the value of the charging parameter, ie the charging current Istation 4 or the charging voltage Ustation 5 in time and to transmit the changed value to the battery management system 1 via the data connection 13.
  • the battery management system 1 is set up to determine the sensor correction value for different values of the charging parameter and to use it to calibrate the sensor.
  • charging current Istation 4 is changed or reset as a loading parameter by the control device 1 1.
  • the charging current I B MS 6 which is likewise shown in FIG. 2, is then determined by a current sensor to be calibrated.
  • the charging voltage Ustation 5 shown in FIG. 4 is changed or reset as a charging parameter.
  • the voltage measurement voltage UBMS 7 likewise shown in FIG. 4 is determined by a voltage sensor to be calibrated.
  • the battery management system 1 determines a measurement difference 8, 9 from the charge measurement current IBMS 6 and the charging current Istation 4 or the charging measurement voltage UBMS 7 and the charging voltage Ustation 5, which is used as sensor correction value ⁇ for calibrating the current sensor to be calibrated or sensor correction value UA for calibrating the voltage sensor to be calibrated becomes.
  • FIG. 2 shows an example of a time profile of a charging current Istation 4 and a charging current I B MS 6 when carrying out an embodiment of the invention. inventive method in which the charging current Istation 4 was gradually increased, here at intervals of 20A.
  • FIG. 3 shows an example of a function of a sensor correction value ⁇ as a function of a charge measurement current I B MS 6.
  • a charge current Istation 4 was increased in steps of 20A as shown in FIG. 2 and a respective charge measurement current I B MS 6 was determined. The difference between charging current iSTATION 4 and a charge measurement current I B MS 6 was applied on the charge measurement current I B MS. 6 With a charging current Istation 4 of 60A, the battery management system 1 determined a charging current l BM s 6 of 65A. The difference between charging current and charging iSTATION 4 measurement current I B MS 6 is for a load measuring current l s BM 6 at 65A, therefore, -5A.
  • the battery management system 1 detects a current value of 65A, it is necessary to add -5A as the sensor correction value. Since there was no continuous determination of the value pairs of charge current Istation 4 and charge measurement current I B MS 6, the sensor correction values IA (IBMS) were interpolated between the given values for the charge measurement current I BM s 6.
  • FIG. 4 shows an example of a time profile of a charging voltage Ustation 5 and a charging measurement voltage U BM s 7.
  • the curves show a continuous course, since charging voltage Ustation 5 and charging measurement voltage U BM s 7 increase continuously with increasing charging state SOC.
  • charging voltage Ustation 5 and charging measurement voltage U BM s 7 have been determined quasi synchronously by a frequent transmission of the charging voltage Ustation 5 to the battery management system 1. This, too, corresponds to a gradual change of the loading parameter, the step size being selected to be small.
  • FIG. 5 shows an example of a function of a sensor correction value UA as a function of a load measurement voltage U BM s 7.
  • the sensor correction value UA (U BM s) was determined analogously to the determination of the sensor correction value ⁇ (IBMS) in FIG. 3.
  • the charging voltage Ustation 5 has been changed continuously or in small steps, so that an associated sensor correction value UA (U BM s) is available for each charging measuring voltage U BM s 7.

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Abstract

The invention relates to a battery management system (1) and to a method for calibrating a sensor of a battery management system (1). The sensor is suitable for detecting a charge parameter when charging a corresponding battery (2) at a charging station (3). According to the invention, when the battery (2) is being charged with a charging current IStation (4), which is dispensed by the charging station (3) at a charging current UStation, the charging current IStation (4) and/or the charging voltage UStation (5) is/are detected by the charging station (3). The charging parameter is detected by the sensor of the battery management system (1) in the form of a charging measurement current IBMS or a charging measurement voltage UBMS, a measurement difference between the charging measurement current IBMS and the charging current IStation or the charging measurement voltage UBMS and the charging voltage UStation is ascertained, and the ascertained measurement difference is used as a sensor correction value in order to calibrate the sensor.

Description

Beschreibung Titel  Description title
BATTERIEMANAGEMENTSYSTEM UND VERFAHREN ZUR KALIBRIERUNG EINES SENSORS EINES BATTERIEMANAGEMENTSYSTEMS Battery management system and method for calibrating a sensor of a battery management system
Die Erfindung betrifft ein Verfahren zur Kalibrierung eines Sensors eines Batteriemanagementsystems während einer Ladung einer zugehörigen Batterie an einer Ladestation. Die Erfindung betrifft weiterhin ein Batteriemanagementsystem für ein eine Batterie aufweisendes Batteriesystem, wobei das Batteriemanagementsystem einen Sensor aufweist, der geeignet ist, bei einer Ladung der Batterie an einer Ladestation einen Ladeparameter zu erfassen. The invention relates to a method for calibrating a sensor of a battery management system during a charge of an associated battery at a charging station. The invention further relates to a battery management system for a battery system having a battery, wherein the battery management system has a sensor which is suitable for detecting a charging parameter when charging the battery at a charging station.
Stand der Technik State of the art
In Hybrid- und Elektrofahrzeugen werden Batteriepacks, oftmals in Li-Ionen- Technologie, eingesetzt, die aus einer großen Anzahl in Serie geschalteter elektrochemischer Zellen bestehen. Ein Batteriemanagementsystem dient zur Überwachung des Batteriepacks, im Folgenden auch Batterie genannt, und soll neben einer Sicherheitsüberwachung eine möglichst hohe Lebensdauer gewährleisten. Hybrid and electric vehicles use battery packs, often in Li-Ion technology, which consist of a large number of series-connected electrochemical cells. A battery management system is used to monitor the battery pack, also referred to below as the battery, and in addition to a safety monitoring to ensure the longest possible life.
Das Batteriemanagement weist verschiedene Sensoren zur Messung von beispielsweise Strom, Spannung und Temperatur auf. Einem Stromsensor zur Messung eines durch die Batterie fließenden Stromes kommt eine große Bedeutung zu, da ein durch ihn ermittelter Stromwert in der Regel für die Bestimmung des Ladezustands (SOC, State of Charge) verwendet wird. Dabei kann der Ladezustand der Batterie umso präziser ermittelt werden, je präziser ein tatsächlich fließender Strom durch den Stromsensor ermittelbar ist. The battery management has various sensors for measuring, for example, current, voltage and temperature. A current sensor for measuring a current flowing through the battery is of great importance, since a current value determined by it is generally used for determining the state of charge (SOC). In this case, the state of charge of the battery can be determined more precisely the more precisely an actually flowing current can be determined by the current sensor.
Des Weiteren erfolgt anhand eines Stromsensors oftmals die Überwachung eines von der Batterie abgegebenen Dauerstromes sowie eines Spitzenstromes, deren Überwachung sicherheitsrelevant ist und deren Höhe ausschlagegebend für die Gewähr von Garantieleistungen sein kann. Je präziser ein von der Batterie abgebbarer Strom ermittelt werden kann, umso kleiner können Sicherheitspuffer zum Ausgleich möglicher Messungenauigkeiten gewählt werden. Furthermore, the monitoring of a continuous current emitted by the battery and of a peak current is often carried out by means of a current sensor. the monitoring of which is relevant to safety and the amount of which can be decisive for the guarantee of the guarantee. The more precisely a current that can be delivered by the battery can be determined, the smaller the safety buffer can be chosen to compensate for possible measurement inaccuracies.
Weiterhin weisen Batteriepacks vielfach einen Spannungssensor zur Ermittlung einer Packspannung auf, welche verwendbar ist, die Summe der Spannungen der in Reihe geschalteten elektrochemischen Zellen zu plausibilisieren. Ferner kann die Batterie einen Spannungssensor zur Ermittlung einer Linkspannung aufweisen, welche netzsanschlussseitig hinter einem Schütz, über welches einIn addition, battery packs often have a voltage sensor for determining a pack voltage, which can be used to make the sum of the voltages of the series-connected electrochemical cells plausible. Furthermore, the battery may have a voltage sensor for detecting a link voltage, which is the mains connection side behind a contactor, via which a
Netz mit der Batterie verbindbar ist, gemessen werden kann. Auf Basis einer möglichen Differenz zwischen einer Packspannung und einer Linkspannung kann eine Diagnose des Schützes erfolgen. Derartige Spannungssensoren werden in der Regel kalibriert in der Batterie bei deren Fertigung verbaut. Im Anschluss findet üblicherweise keine weitere Kalibrierung statt, die mögliche alterungsbedingte Sensorwertabweichungen ausgleicht. Aus der JP2013090473 ist eine Energiespeichervorrichtung und eine Methode bekannt, Abnormalitäten eines Stromsensors eines Fahrzeugs zu erkennen. Dazu vergleicht ein Regler die Erfassungswerte von ersten Stromsensoren in der Energiespeichervorrichtung und zweiten Stromsensoren in einer an Bord des Fahrzeugs befindlichen Ladevorrichtung, die über ein Ladekabel von einer exter- nen Energiequelle versorgt wird. Network is connectable to the battery, can be measured. Based on a possible difference between a pack voltage and a link voltage, a diagnosis of the contactor can be made. Such voltage sensors are usually calibrated installed in the battery during their production. Following this, usually no further calibration takes place, which compensates for possible age-related sensor value deviations. From JP2013090473 an energy storage device and a method is known to detect abnormalities of a current sensor of a vehicle. For this purpose, a controller compares the detection values of first current sensors in the energy storage device and second current sensors in a charging device located on the vehicle, which is supplied via a charging cable from an external energy source.
Die JP 2012-080712 beschreibt eine an Bord eines Fahrzeugs betriebene Fahrzeugladevorrichtung, die eine Ladung einer Fahrzeugbatterie ermöglicht, auch wenn ein Sensor einen abnormalen Wert liefert. Die Fahrzeugladevorrichtung weist eingangsseitig wie ausgangsseitig Sensoren auf, deren Werte von einerJP 2012-080712 describes an in-vehicle vehicle charging device that allows charging of a vehicle battery even when a sensor provides an abnormal value. The vehicle charging device has on the input side as on the output side sensors whose values of a
Fehlererkennungseinrichtung verglichen werden, um so den Erfassungsfehler zu detektieren. Error detection means are compared, so as to detect the detection error.
Die bei einer Ladung einer Batterie von einer Energiequelle übertragene La- dungsmenge bestimmt sich aus einem über die Zeit integrierten Produkt von ei- nem Ladestrom und einer zugehörigen Ladespannung. Ladestrom und Ladespannung werden im Folgenden daher auch gemeinschaftlich als Ladeparameter bezeichnet. Desweiteren werden im Folgenden Ströme und Spannungen, die von einem Sensor des Batteriemanagementsystems erfasst werden, als IBMS und UBMS, sowie Ströme und Spannungen, die von einer stationären Ladestation ermittelt werden, als Istation oder Ustation bezeichnet. The charge transferred from a power source when charging a battery is determined by a product of time integrated with nem charging current and an associated charging voltage. Charging current and charging voltage are therefore also collectively referred to as charging parameters. Furthermore, in the following, currents and voltages which are detected by a sensor of the battery management system, referred to as I B MS and UBMS, as well as currents and voltages, which are determined by a stationary charging station, referred to as Istation or Ustation.
Offenbarung der Erfindung Disclosure of the invention
Erfindungsgemäß vorgesehen ist ein Verfahren zur Kalibrierung eines Sensors eines Batteriemanagementsystems, wobei der Sensor geeignet ist, bei einer Ladung einer zugehörigen Batterie an einer Ladestation einen Ladeparameter zu erfassen. Dabei wird bei einer Ladung der Batterie mit einem von der Ladestation bei einer Ladespannung Ustation abgegebenen Ladestrom Istation (i) durch die Ladestation der Ladestrom Istation und/oder die Ladespannung Ustation erfasst, (ii) der Ladeparameter durch den Sensor des Batteriemanagementsystems in Form eines Lademessstroms IBMS oder einer Lademessspannung UBMS erfasst, (iii) eine Messdifferenz aus dem Lademessstrom IBMS und dem Ladestrom Istation oder der Lademessspannung UBMS und der Ladespannung Ustation ermittelt und (iv) die ermittelte Messdifferenz als Sensorkorrekturwert zur Kalibrierung des Sensors verwendet. Provided according to the invention is a method for calibrating a sensor of a battery management system, wherein the sensor is suitable for detecting a charging parameter when charging an associated battery at a charging station. In this case, when the battery is charged with a charge current Istation (i) delivered by the charging station at a charging voltage Ustation, the charging station detects the charge current Istation and / or the charging voltage Ustation, (ii) the charging parameter through the sensor of the battery management system in the form of a charging current I B MS or a charging measurement voltage U B MS detects, (iii) a measurement difference between the charge measurement current I B MS and the charge current Istation or the charge measurement voltage U B MS and the charge voltage Ustation determined and (iv) the determined measurement difference as a sensor correction value for calibration of the sensor used.
Ein derartiges Verfahren bietet mehrere Vorteile. Ein erster Vorteil besteht darin, dass ein Sensor eines Batteriemanagements überprüfbar ist. An einer Ladestation, insbesondere für ein Hybrid- oder Elektrofahrzeug, wird, nicht zuletzt zu Abrechnungszwecken, eine genau bestimmte Ladungsmenge abgegeben. Dazu müssen die Sensoren zur Bestimmung der Ladungsmenge, d.h. die Sensoren zur Ermittlung des abgegeben Ladestroms und der dabei bestehenden Lade- Spannung Ustation geeicht sein. Eine derartige Eichung ist in der Regel seitens eines Betreibers einer Ladestation, beispielsweise durch regelmäßige Überprüfungen, zu gewährleisten. Bei dem erfindungsgemäßen Verfahren wird eine Messdifferenz aus einem vom Batteriemanagementsystem ermittelten Lademessstrom lBMs und dem Ladestrom Istation oder einer vom Batteriemanagementsystem ermit- telten Lademessspannung UBMS und der Ladespannung Ustation ermittelt. Die Er- mittlung dieser Differenz erlaubt somit einen Vergleich eines von einem Sensor des Batteriemanagementsystems ermittelten Wertes mit einem von der Ladestation ermittelten Wert, wobei letzterer aufgrund einer Eichung der Ladestation eine hohe Zuverlässigkeit aufweisen sollte. So sind zum Beispiel sämtliche Sensoren einer Fahrzeugbatterie gemeinsam Umwelteinflüssen ausgesetzt, welche auf dasSuch a method offers several advantages. A first advantage is that a sensor of a battery management is verifiable. At a charging station, in particular for a hybrid or electric vehicle, a precisely determined amount of charge is delivered, not least for billing purposes. For this purpose, the sensors for determining the amount of charge, ie the sensors for determining the output charging current and the existing charging voltage Ustation must be calibrated. Such a calibration is usually to be ensured by an operator of a charging station, for example by regular checks. In the method according to the invention, a measurement difference is determined from a charge measurement current I BM s determined by the battery management system and the charge current Istation or a charge measurement voltage U B MS and the charge voltage Ustation determined by the battery management system. Which he- Averaging this difference thus allows a comparison of a value determined by a sensor of the battery management system with a value determined by the charging station, the latter should have a high reliability due to a calibration of the charging station. For example, all sensors of a vehicle battery are exposed together to environmental influences, which on the
Fahrzeug einwirken. Vorteilhaft erlaubt das Verfahren einen Vergleich mit einer dem Batteriemanagement nicht zugehörigen, und im Falle einer Fahrzeugbatterie nicht an Bord des Fahrzeugs befindlichen und darüber hinaus in der Regel geeichten Strom- bzw. Spannungsreferenz. Vehicle interact. Advantageously, the method allows a comparison with a battery management not associated, and in the case of a vehicle battery not on board the vehicle and also usually calibrated current or voltage reference.
Ein weiterer Vorteil des Verfahrens besteht darin, dass Sensorfehler zuverlässig erkennbar sind, wobei eine Überprüfung der Sensoren bei jeder Ladung der Batterie vornehmbar ist. Das erfinderische Verfahren bietet somit den Vorteil einer regelmäßigen Sensor-Diagnose ohne dass dazu zeitliche Mehraufwände erfor- derlich sind. Another advantage of the method is that sensor errors are reliably detectable, whereby a check of the sensors is vornehmbar with each charge of the battery. The inventive method thus offers the advantage of a regular sensor diagnosis without the need for time-consuming additional work.
Desweiteren bietet das erfindungsgemäße Verfahren den Vorteil, dass ein Sensor eines Batteriemanagementsystems regelmäßig, d.h. bei jeder Ladung, nicht nur überprüfbar, sondern auch kalibrierbar ist. Auch die Kalibrierung erfolgt ohne zeitliche Mehraufwände, d.h. im Falle einer Fahrzeugbatterie beispielsweise ohne einen Werkstattbesuch. Aus einer häufigen Durchführung des Verfahrens, d.h. auf Grund eines häufig überprüften, gegebenenfalls nachkalibrierten und somit zuverlässig ermittelnden Sensors eines Batteriemanagementsystems ergeben sich eine Reihe weiterer Vorteile. So sind die Ladezustände der Batterie SOC (State of Charge) präzise zu ermitteln, was eine genaue Aussage über eine zur Verfügung stehende Restladung bzw. mögliche Restleistung erlaubt. Weiterhin ist der Alterungszustand SOH (State of Health) der Batterie exakter zu bestimmen. Und ferner erlauben präzise Messwerte die Reduzierung von Sicherheitstoleranzen. Darüber hinaus sind feine Unterschiede zwischen vom Batterie- managementsystem ermittelten Spannungen, beispielsweise zwischen Link- undFurthermore, the inventive method offers the advantage that a sensor of a battery management system regularly, i. at every charge, not only verifiable, but also calibratable. The calibration also takes place without additional time, i. in the case of a vehicle battery, for example, without a workshop visit. From a frequent implementation of the method, i. On the basis of a frequently checked, possibly recalibrated and thus reliably detecting sensor of a battery management system, there are a number of further advantages. Thus, the state of charge of the battery SOC (state of charge) are precisely determined, which allows an accurate statement about an available residual charge or possible residual power. Furthermore, the aging state SOH (State of Health) of the battery can be determined more precisely. Furthermore, precise measurements allow the reduction of safety tolerances. In addition, there are subtle differences between voltages determined by the battery management system, for example, between link and
Packspannung, präziser zu ermitteln, wodurch batterie-interne Diagnosen, wie beispielsweise zur Schützdiagnose präziser erfolgen können. Pack voltage to determine more precisely, which battery-internal diagnoses, such as for contactor diagnosis can be made more precise.
Vorteilhaft erfolgt die Durchführung des Verfahrens derart, dass der Wert des Ladeparameters von der Ladestation an das Batteriemanagementsystem der Batterie übermittelt wird und das Batteriemanagementsystem die Berechnung der Messdifferenz vornimmt. Eine derartige Ausgestaltung erlaubt eine effiziente Durchführung des Verfahrens, da für das Verfahren nur ein unidirektionales Datenübertragungsverfahren, zur Übertragung der Daten von der Station zur Batte- rie, erforderlich ist. Bei einer alternativen Ausgestaltung, bei welcher Lademessstrom IBMS oder Lademessspannung UBMS von der Batterie an die Ladestation übermittelt werden, um dort die Differenz zu berechnen, müsste eine ermittelte Messdifferenz oder ein Sensorkorrekturwert mit einem bidirektionalen Datenübertragungsverfahren in einer weiteren Übertragung an die Batterie übermittelt werden. The implementation of the method advantageously takes place such that the value of the charging parameter from the charging station to the battery management system of the Battery is transmitted and the battery management system performs the calculation of the measurement difference. Such an embodiment allows an efficient implementation of the method, since the method requires only a unidirectional data transmission method for transmitting the data from the station to the battery. In an alternative embodiment, in which charging current IBMS or charging voltage U B MS are transmitted from the battery to the charging station in order to calculate the difference there, a determined measurement difference or a sensor correction value would have to be transmitted to the battery in a further transmission with a bidirectional data transmission method ,
Vorteilhaft wird die Übermittlung durch ein Handshake-Protokoll abgesichert. Unter Handshake wird im Allgemeinen ein Quittungsbetrieb verstanden. Bei einem entsprechenden Handshake-Verfahren synchronisieren sich zwei an einer Da- tenübertragung beteiligte Teilnehmer nach jedem Übertragungsvorgang durch unmittelbare Quittungssignale. Da durch das Verfahren in die Ermittlung sensibler Batteriekenngrößen eingegriffen wird, kann eine fehlerhafte Übermittlung eines Ladeparameters, welche zu Fehlkalibrierungen führen könnte, schwerwiegende Folgen verursachen. Eine Übermittlung des Ladeparameters wird daher vorteilhaft von der Batterie quittiert. Darüber hinaus erfolgt die die Übertragung vorteilhaft in einem Verfahren, welches den empfangenen Wert an den Absender zurück überträgt oder welches eine Information, z.B. eine Prüfziffer, verwendet, um die Richtigkeit der empfangenen Daten verifizieren zu können. Vorteilhaft erfolgt die Durchführung des Verfahrens derart, dass sich der Wert des Ladeparameters zeitlich ändert und der Sensorkorrekturwert für verschiedene Werte des Ladeparameters ermittelt wird. Da ein Sensorfehler über einen Wertebereich der von dem Sensor erfassten Größe nicht konstant sein muss, erlaubt eine derartige Ausgestaltung die Erstellung einer Wertetabelle (auch Lookuptable genannt) oder einer Korrekturkennlinie, anhand derer sich jedem ermittelten Sensorwert ein korrigierter Sensorwert zuordnen lässt. Advantageously, the transmission is secured by a handshake protocol. Handshake is generally understood as a receipt operation. In a corresponding handshake method, two subscribers participating in a data transmission synchronize themselves after each transmission process by means of immediate acknowledgment signals. Since the method intervenes in the determination of sensitive battery parameters, a faulty transmission of a charging parameter, which could lead to incorrect calibrations, can cause serious consequences. A transmission of the charging parameter is therefore advantageously acknowledged by the battery. Moreover, the transfer advantageously takes place in a method which transmits the received value back to the sender or which contains information, e.g. a check digit used to verify the accuracy of the received data. The method is advantageously carried out such that the value of the charging parameter changes over time and the sensor correction value is determined for different values of the charging parameter. Since a sensor error does not have to be constant over a range of values of the variable detected by the sensor, such an embodiment allows the creation of a value table (also called a lookuptable) or a correction characteristic curve, by means of which a corrected sensor value can be assigned to each sensor value determined.
Vorteilhaft erfolgt eine kontinuierliche oder schrittweise Änderung des Wertes des Ladeparameters. Eine derartige Durchführung erlaubt mit jedem Schritt zunächst eine Übertragung des Wertes des Ladeparameters, der in dem darauf folgenden Zeitintervall durch die Ladestation eingestellt wird. Durch eine Wiederholung dieser Vorgehensweise ist schrittweise eine Korrekturkennlinie ermittelbar. Alternativ oder ergänzend erfolgt eine kontinuierliche Änderung des Ladeparameters, bei welchem durch die Übertragung quasi kontinuierlich ein in der Ladestation er- fasster Wert eines Ladeparameters an das Batteriemanagementsystem übermittelt wird. So bedingt beispielsweise ein konstanter Ladestrom Istation eine kontinuierlich steigende Ladespannung Ustation- Eine kontinuierliche Übermittlung der Ladespannung Ustation erlaubt im Batteriemanagementsystem eine Ermittlung einer zugehörigen kontinuierlichen Lademessspannung UBMs- Advantageously, there is a continuous or stepwise change in the value of the charging parameter. Such a procedure allows at each step, first, a transmission of the value of the loading parameter, which in the following Time interval is set by the charging station. By repeating this procedure, a correction characteristic can be determined step by step. Alternatively or additionally, there is a continuous change in the charging parameter, in which a value of a charging parameter detected in the charging station is quasi continuously transmitted to the battery management system as a result of the transmission. For example, a constant charging current Istation requires a continuously increasing charging voltage Ustation. A continuous transmission of the charging voltage Ustation allows a determination in the battery management system of an associated continuous charging measuring voltage U BM s.
Vorteilhaft erfolgt eine schrittweise Änderung eines Ladeparameters nur nach einem erfolgreichen Handshake, da eine fehlerhafte Zuordnung von einem vermeintlichen, gegebenenfalls zuvor eingestellten Ladeparameter zu einem von der Ladestation tatsächlich eingestellten Ladeparameter zu Fehlkalibrierungen führen kann. Advantageously, a step-by-step change of a charging parameter takes place only after a successful handshake, since a faulty assignment of a supposed, optionally previously set charging parameter to a charging parameter actually set by the charging station can lead to incorrect calibrations.
Vorteilhaft erfolgt die Durchführung des Verfahrens derart, dass die Messdifferenz mit einem Schwellenwert verglichen wird, bei dessen Überschreiten eine Fehlersignalisierung erfolgt. Eine derartige Durchführung des Verfahrens erlaubt es, sowohl Fehler bei der Kalibrierung als auch Sensordefekte zu ermitteln und zu signalisieren. Im Falle der Durchführung des Verfahrens in einer Fahrzeugbatterie ist einem Fahrer/einer Fahrerin das Vorliegen eines Fehlers signalisierbar. Advantageously, the method is carried out in such a way that the measurement difference is compared with a threshold value above which error signaling takes place. Such an implementation of the method makes it possible to detect both errors in the calibration and sensor defects and to signal. In the case of carrying out the method in a vehicle battery, a driver can be signaled the presence of an error.
Vorteilhaft erfolgt die Durchführung des Verfahrens mit einer Ladespannung Ustation als Ladeparameter. Bei einer derartigen Durchführung des Verfahrens wird die Ladespannung Ustation beispielsweise an die Batterie übermittelt. Das Batteriemanagementsystem der Batterie ermittelt über einen zu kalibrierenden Spannungssensor die Lademessspannung UBMS und berechnet die zugehörige Messdifferenz AU . Diese wird gespeichert und als Sensorkorrekturwert UA verwendet. Dies erfolgt beispielsweise durch eine Addition des Sensorkorrekturwertes UA zu dem von dem Sensor ermittelten Wert einer Spannung UBMs- Vorteilhaft erfolgt die Bestimmung des Sensorkorrekturwertes UA nicht für einen einzigen Spannungswert UBMs, sondern für zumindest einen Abschnitt seines Wertebereichs. Wird die Ladespannung Ustation durch die Ladestation beispielsweise schrittweise erhöht, wobei sich für jede Ladespannung Ustation ein zugehöriger Ladestrom Istation einstellt, wird für die jeweilige Ladespannung Ustation eine jeweils zugehörige Messdifferenz AU ermittelt. Diese wird in Form einer Sensorkorrekturkennlinie UA(UBMS) abgespeichert, so dass für einen von dem Spannungssensor ermittelten Wert UBMS ein zugehöriger Sensorkorrekturwert UA zur Verfügung steht. Advantageously, the method is carried out with a charging voltage Ustation as a charging parameter. In such an implementation of the method, the charging voltage Ustation is transmitted to the battery, for example. The battery management system of the battery determines the charging measurement voltage U B MS via a voltage sensor to be calibrated and calculates the associated measurement difference AU. This is stored and used as sensor correction value UA. This is done, for example, by adding the sensor correction value UA to the value of a voltage U BM determined by the sensor. Advantageously, the sensor correction value UA is not determined for a single voltage value U BM s but for at least a portion of its value range. If, for example, the charging voltage Ustation is incrementally increased by the charging station, with an associated charging current actualization setting for each charging voltage Ustation, a respectively associated measuring difference AU is determined for the respective charging voltage Ustation. This is stored in the form of a sensor correction characteristic UA (UBMS), so that an associated sensor correction value UA is available for a value UBMS determined by the voltage sensor.
Vorteilhaft erfolgt die Durchführung des Verfahrens mit einem Ladestrom Istation als Ladeparameter. Bei einer derartigen Durchführung des Verfahrens wird der Ladestrom Istation beispielsweise an die Batterie übermittelt. Das Batteriemanagementsystem der Batterie ermittelt über einen zu kalibrierenden Stromsensor den Lademessstrom lBMs und berechnet die zugehörige Messdifferenz ΔΙ . Diese wird gespeichert und als Sensorkorrekturwert ΙΔ verwendet. Dies erfolgt beispielsweise durch eine Addition des Sensorkorrekturwertes ΙΔ zu dem von dem Sensor ermittelten Wert eines Stromes lBMs- Vorteilhaft erfolgt die Bestimmung des Sensorkorrekturwertes ΙΔ nicht für einen einzigen Stromwert lBMs, sondern für zumindest einen Abschnitt seines Wertebereichs. Advantageously, the implementation of the method with a charging current Istation takes place as a charging parameter. In such an implementation of the method, the charging current Istation is transmitted, for example, to the battery. The battery management system of the battery determines the charging current I B Ms via a current sensor to be calibrated and calculates the associated measurement difference ΔΙ. This is stored and used as sensor correction value ΙΔ. This is done, for example, by adding the sensor correction value ΙΔ to the value of a current l BM s determined by the sensor. Advantageously, the sensor correction value ΙΔ is not determined for a single current value l BM s but for at least a portion of its value range.
Wird der Ladestrom Istation durch die Ladestation beispielsweise schrittweise erhöht, indem beispielsweise die Ladespannung Ustation erhöht oder gesenkt wird, bis sich ein zugehöriger Ladestrom Istation einstellt, wird für den jeweiligen Ladestrom Istation eine jeweils zugehörige Messdifferenz ΔΙ ermittelt. Diese wird in Form einer Sensorkorrekturkennlinie IA(lBMs) abgespeichert, so dass für einen von dem Stromsensor ermittelten Wert lBMs ein zugehöriger Sensorkorrekturwert ΙΔ zur Verfügung steht. If the charging current Istation is incrementally increased by the charging station, for example, by increasing or decreasing the charging voltage Ustation until an associated charging current Istation is established, a respectively associated measurement difference ΔΙ is determined for the respective charging current. This is stored in the form of a sensor correction characteristic IA (l BM s), so that an associated sensor correction value ΙΔ is available for a value l BM s determined by the current sensor.
Vorteilhaft erfolgt die Durchführung des Verfahrens mit einem negativen Ladestrom Istation bzw. einem Entladestrom als Ladeparameter. Durch beispielsweise eine Senkung der Ladespannung Ustation unter die Packspannung bzw. unter die Linkspannung ist eine Umkehr des Ladestroms Istation in einen Entladestrom erzielbar, über dessen Veränderung in gleicher Weise eine Sensorkorrekturkennlinie IA(IBMS) ermittelbar ist. Advantageously, the method is carried out with a negative charging current Istation or a discharge current as a charging parameter. By, for example, a lowering of the charging voltage Ustation below the pack voltage or below the link voltage, a reversal of the charging current Istation into a discharge current can be achieved, via the change of which a sensor correction characteristic IA (IBMS) can be determined in the same way.
Vorteilhaft erfolgt die Durchführung des Verfahrens zu einer Kalibrierung eines Sensors eines Batteriemanagementsystems, der zur Bestimmung der Kapazität der Batterie verwendet wird. Eine Bestimmung der Kapazität auf Basis eines über dieses Verfahren kalibrierten Sensors erlaubt eine genaue Bestimmung deren Höhe, die Beispielsweise eine präzise Berechnung einer zur Verfügung stehenden Reichweite oder Restreichweite eines Hybrid- oder Elektrofahrzeugs erlaubt. Advantageously, the method is carried out to calibrate a sensor of a battery management system, which is used to determine the capacity the battery is used. A determination of the capacitance based on a calibrated by this method sensor allows an accurate determination of their height, which allows, for example, a precise calculation of an available range or remaining range of a hybrid or electric vehicle.
Bei dem erfindungsgemäßen Batteriemanagementsystem für ein eine Batterie aufweisendes Batteriesystem, welches einen Sensor aufweist, der geeignet ist, bei einer Ladung der Batterie an einer Ladestation einen Ladeparameter zu erfassen ist vorgesehen, dass es eingerichtet ist, (i) die Größe einer beim Laden der Batterie mittels einer Ladestation systemextern erfassten Ladespannung Ustation und/oder eines systemextern erfassten Ladestroms Istation einzulesen, (ii) über den Sensor einen Lademessstrom IBMS oder eine Lademessspannung UBMS als Ladeparameter zu erfassen, (iii) eine Messdifferenz aus dem Lademessstrom IBMS und dem Ladestrom Istation oder der Lademessspannung UBMS und der Ladespannung Ustation zu ermitteln und (iv) die ermittelte Messdifferenz als Sensorkorrekturwert zur Kalibrierung des Sensors zu verwenden. Das Batteriemanagementsystem ist insbesondere ein Batteriemanagementsystem zur Durchführung des vorstehend genannten Verfahrens. In the battery management system according to the invention for a battery system having a battery, which has a sensor which is suitable to detect a charging parameter when the battery is charged at a charging station, it is provided that it is set up (i) the size of a battery when charging (ii) via the sensor to detect a charging current I B MS or a charging voltage U B MS as a charging parameter, (iii) a measuring difference from the charging current IBMS and the Charging current Istation or the charging voltage U B MS and the charging voltage Ustation to determine and (iv) to use the determined measurement difference as a sensor correction value for the calibration of the sensor. The battery management system is in particular a battery management system for carrying out the above-mentioned method.
Zeichnungen drawings
Nachfolgend wird die Erfindung unter Bezugnahme auf die anliegenden Zeichnungen anhand bevorzugter Ausführungsformen näher erläutert. The invention will be explained in more detail with reference to the accompanying drawings with reference to preferred embodiments.
Es zeigen Show it
Fig. 1 ein Beispiel einer Anordnung eines Batteriesystems an einer Ladestation zur Durchführung des erfindungsgemäßen Verfahrens; 1 shows an example of an arrangement of a battery system at a charging station for carrying out the method according to the invention;
Fig. 2 ein Beispiel eines zeitlichen Verlaufs eines Ladestroms Istation und eines Lademessstroms IBMS bei einer Durchführung einer Ausführung des erfindungsgemäßen Verfahrens; Fig. 3 ein Beispiel einer Funktion eines Sensorkorrekturwertes ΙΔ in Abhängigkeit von einem Lademessstrom IBMS; 2 shows an example of a time profile of a charging current Istation and a charging current I B MS in carrying out an embodiment of the method according to the invention; 3 shows an example of a function of a sensor correction value ΙΔ as a function of a load measuring current I B MS;
Fig. 4 ein Beispiel eines zeitlichen Verlaufs einer Ladespannung Ustation und eines Lademessspannung UBMS bei einer Durchführung einer Ausführung des erfindungsgemäßen Verfahrens; 4 shows an example of a time profile of a charging voltage Ustation and a charging measuring voltage U B MS when carrying out an embodiment of the method according to the invention;
Fig. 5 ein Beispiel einer Funktion eines Sensorkorrekturwertes DA in 5 shows an example of a function of a sensor correction value DA in
Abhängigkeit von einer Lademessspannung UBMS. Dependence on a charging voltage U B MS.
Fig. 1 zeigt ein Beispiel einer Anordnung eines Batteriesystems 10 an einer Ladestation 3 zur Durchführung einer Ausführung des erfindungsgemäßen Verfahrens. 1 shows an example of an arrangement of a battery system 10 at a charging station 3 for performing an embodiment of the method according to the invention.
Das Batteriesystem 10 weist eine Batterie 2 auf, welche von einem Batteriemanagementsystem 1 verwaltet wird. Dazu weist das Batteriemanagementsystem 1 mehrere, hier nicht gezeigt Sensoren zur Erfassung von Spannungen, beispielsweise der Packspannung als Spannung über den Batteriepack oder beispielsweise der Linkspannung als Spannung an einem Verbraucherausgang der Batterie 2 auf. The battery system 10 has a battery 2, which is managed by a battery management system 1. For this purpose, the battery management system 1 has a plurality of sensors, not shown here, for detecting voltages, for example the pack voltage as a voltage across the battery pack or, for example, the link voltage as a voltage at a consumer output of the battery 2.
Das Batteriesystem 10 wird von einer Ladestation 3 über ein Ladekabel 12 geladen. Dabei fließt in dem Ladekabel 12 ein von der Ladestation 3 abgegebener Ladestrom Istation 4 bei einer Ladespannung Ustation 5. Der Ladestrom Istation 4 und die Ladespannung Ustation 5 sind von einer Regelvorrichtung 1 1 in der Ladestation 3 einstellbar. Ladespannung Ustation 5 und Ladestrom Istation 4 werden in der Ladestation 3 von geeichten Messgeräten I und U erfasst. The battery system 10 is charged by a charging station 3 via a charging cable 12. In this case, in the charging cable 12 a discharged from the charging station 3 charging current Istation 4 at a charging voltage Ustation 5. The charging current Istation 4 and the charging voltage Ustation 5 are adjustable by a control device 1 1 in the charging station 3. Charging voltage Ustation 5 and charging current Istation 4 are detected in the charging station 3 by calibrated measuring instruments I and U.
Desweiteren besteht zwischen der Ladestation 3 und dem Batteriesystem 10, insbesondere zwischen der Ladestation 3 und dem BatteriemanagementsystemFurthermore, there is between the charging station 3 and the battery system 10, in particular between the charging station 3 and the battery management system
1 der Batterie 2 eine Datenverbindung 13. Diese kann sowohl schnurlos als auch als Leitung ausgeführt sein. Über die Datenverbindung 13 ist ein Wert eines Ladeparameters, zum Beispiel der Ladestrom Istation 4 oder die Ladespannung Ustation 5 von der Ladestation 3 an das Batteriemanagementsystem 1 der Batterie1 of the battery 2, a data connection 13. This can be performed both cordless and as a line. Via the data connection 13 is a value of a charging parameter, for example the charging current Istation 4 or the charging voltage Ustation 5 from the charging station 3 to the battery management system 1 of the battery
2 übermittelbar. Die Übermittlung kann durch ein Handshake-Protokoll zwischen dem Batteriemanagementsystem 1 und der Regelvorrichtung 1 1 abgesichert werden. Die Regeleinrichtung 1 1 ist eingerichtet, den Wert des Ladeparameters, d.h. den Ladestrom Istation 4 oder die Ladespannung Ustation 5 zeitlich zu ändern und den geänderten Wert an das Batteriemanagementsystem 1 über die Daten- Verbindung 13 zu übermitteln. Das Batteriemanagementsystem 1 ist eingerichtet, den Sensorkorrekturwert für verschiedene Werte des Ladeparameters zu ermitteln und zur Kalibrierung des Sensors zu verwenden. 2 transmitted. The transmission may be through a handshake protocol between the battery management system 1 and the control device 1 1 are hedged. The control device 1 1 is configured to change the value of the charging parameter, ie the charging current Istation 4 or the charging voltage Ustation 5 in time and to transmit the changed value to the battery management system 1 via the data connection 13. The battery management system 1 is set up to determine the sensor correction value for different values of the charging parameter and to use it to calibrate the sensor.
Mit der Anordnung erfolgt eine Durchführung Verfahrens in einer derartigen Aus- gestaltung, dass durch die Regeleinrichtung 1 1 eine kontinuierliche oder schrittweise Änderung des Wertes des Ladeparameters erfolgt. Dabei erfolgt eine jeweilige Änderung eines Ladeparameters nur nach einem erfolgreichen Handshake. With the arrangement, a procedure is carried out in such a configuration that a continuous or stepwise change of the value of the charging parameter takes place by the control device 11. In this case, a respective change of a loading parameter takes place only after a successful handshake.
Nach einem erfolgreichen Handshake wird durch die Regeleinrichtung 1 1 der Ladestation 3 der in Fig. 2 gezeigte Ladestrom Istation 4 als Ladeparameter verändert bzw. neu eingestellt. Seitens des Batteriemanagementsystems 1 erfolgt daraufhin durch einen zu kalibrierenden Stromsensor die Ermittlung des ebenfalls in Fig. 2 gezeigten Lademessstroms IBMS 6. After a successful handshake the loading station 3 shown in Fig. 2 charging current Istation 4 is changed or reset as a loading parameter by the control device 1 1. On the part of the battery management system 1, the charging current I B MS 6, which is likewise shown in FIG. 2, is then determined by a current sensor to be calibrated.
Alternativ wird durch die Regeleinrichtung 1 1 der Ladestation 3 die in Fig. 4 gezeigte Ladespannung Ustation 5 als Ladeparameter verändert bzw. neu eingestellt. Seitens des Batteriemanagementsystems 1 erfolgt durch einen zu kalibrierenden Spannungssensor die Ermittlung der ebenfalls in Fig. 4 gezeigten Lademessspannung UBMS 7. Alternatively, by the control device 1 1 of the charging station 3, the charging voltage Ustation 5 shown in FIG. 4 is changed or reset as a charging parameter. On the part of the battery management system 1, the voltage measurement voltage UBMS 7 likewise shown in FIG. 4 is determined by a voltage sensor to be calibrated.
Das Batteriemanagementsystem 1 ermittelt eine Messdifferenz 8, 9 aus dem Lademessstrom IBMS 6 und dem Ladestrom Istation 4 oder der Lademessspannung UBMS 7 und der Ladespannung Ustation 5, welche als Sensorkorrekturwert ΙΔ zur Kalibrierung des zu kalibrierenden Stromsensors oder Sensorkorrekturwert UA zur Kalibrierung des zu kalibrierenden Spannungssensors verwendet wird. The battery management system 1 determines a measurement difference 8, 9 from the charge measurement current IBMS 6 and the charging current Istation 4 or the charging measurement voltage UBMS 7 and the charging voltage Ustation 5, which is used as sensor correction value ΙΔ for calibrating the current sensor to be calibrated or sensor correction value UA for calibrating the voltage sensor to be calibrated becomes.
Fig. 2 zeigt ein Beispiel eines zeitlichen Verlaufs eines Ladestroms Istation 4 und eines Lademessstroms IBMS 6 bei einer Durchführung einer Ausführung des er- findungsgemäßen Verfahrens, bei welchem der Ladestroms Istation 4 schrittweise, hier in Intervallen von 20A, erhöht wurde. 2 shows an example of a time profile of a charging current Istation 4 and a charging current I B MS 6 when carrying out an embodiment of the invention. inventive method in which the charging current Istation 4 was gradually increased, here at intervals of 20A.
Fig. 3 zeigt ein Beispiel einer Funktion eines Sensorkorrekturwertes ΙΔ in Abhängigkeit von einem Lademessstrom IBMS 6. Zur Erstellung der Funktion wurde ein Ladestrom Istation 4 wie in Figur 2 gezeigt in Schritten von 20A erhöht und ein jeweiliger Lademessstrom IBMS 6 ermittelt. Die Differenz zwischen Ladestrom Istation 4 und eines Lademessstroms IBMS 6 wurde über den Lademessstroms IBMS 6 aufgetragen. Bei einem Ladestrom Istation 4 von 60A wurde vom Batteriemanagementsystem 1 ein Lademessstrom lBMs 6 in Höhe von 65A ermittelt. Die Differenz zwischen Ladestrom Istation 4 und Lademessstrom IBMS 6 beträgt für einen Lademessstroms lBMs 6 bei 65A demnach -5A. Wird vom Batteriemanagementsystem 1 ein Stromwert von 65A erfasst, so sind zu diesem -5A als Sensorkorrekturwert hinzuzufügen. Da keine kontinuierliche Ermittlung der Wertepaare aus Ladestrom Istation 4 und Lademessstrom IBMS 6 erfolgte, wurde die Sensorkorrekturwerte IA(IBMS) zwischen den gegebenen Werten für den Lademessstrom lBMs 6 interpoliert. FIG. 3 shows an example of a function of a sensor correction value ΙΔ as a function of a charge measurement current I B MS 6. To establish the function, a charge current Istation 4 was increased in steps of 20A as shown in FIG. 2 and a respective charge measurement current I B MS 6 was determined. The difference between charging current iSTATION 4 and a charge measurement current I B MS 6 was applied on the charge measurement current I B MS. 6 With a charging current Istation 4 of 60A, the battery management system 1 determined a charging current l BM s 6 of 65A. The difference between charging current and charging iSTATION 4 measurement current I B MS 6 is for a load measuring current l s BM 6 at 65A, therefore, -5A. If the battery management system 1 detects a current value of 65A, it is necessary to add -5A as the sensor correction value. Since there was no continuous determination of the value pairs of charge current Istation 4 and charge measurement current I B MS 6, the sensor correction values IA (IBMS) were interpolated between the given values for the charge measurement current I BM s 6.
Fig.4 zeigt ein Beispiel eines zeitlichen Verlaufs einer Ladespannung Ustation 5 und einer Lademessspannung UBMs 7. Die Kurven zeigen einen kontinuierlichen Verlauf, da Ladespannung Ustation 5 und Lademessspannung UBMs 7 mit zunehmenden Ladeszustand SOC kontinuierlich steigen. Dabei sind Ladespannung Ustation 5 und Lademessspannung UBMs 7 durch eine häufige Übermittlung der Ladespannung Ustation 5 an das Batteriemanagementsystem 1 quasi synchron ermittelt worden. Auch dies entspricht einer schrittweisen Änderung des Ladeparameters, wobei die Schrittweite klein gewählt wurde. 4 shows an example of a time profile of a charging voltage Ustation 5 and a charging measurement voltage U BM s 7. The curves show a continuous course, since charging voltage Ustation 5 and charging measurement voltage U BM s 7 increase continuously with increasing charging state SOC. In this case, charging voltage Ustation 5 and charging measurement voltage U BM s 7 have been determined quasi synchronously by a frequent transmission of the charging voltage Ustation 5 to the battery management system 1. This, too, corresponds to a gradual change of the loading parameter, the step size being selected to be small.
Fig. 5 zeigt ein Beispiel einer Funktion eines Sensorkorrekturwertes UA in Abhängigkeit von einer Lademessspannung UBMs 7. Dabei erfolgte die Ermittlung eines Sensorkorrekturwertes UA( UBMs) analog zur Ermittlung des Sensorkorrekturwertes ΙΔ (IBMS) in Figur 3. Im Unterschied zur Vorgehensweise in Figur 3 wurde die Ladespannung Ustation 5 kontinuierlich bzw. in kleinen Schritten geändert, so dass für jede Lademessspannung UBMs 7 ein zugehöriger Sensorkorrekturwert UA( UBMs) verfügbar ist. FIG. 5 shows an example of a function of a sensor correction value UA as a function of a load measurement voltage U BM s 7. The sensor correction value UA (U BM s) was determined analogously to the determination of the sensor correction value ΙΔ (IBMS) in FIG. 3. In contrast to the procedure In FIG. 3, the charging voltage Ustation 5 has been changed continuously or in small steps, so that an associated sensor correction value UA (U BM s) is available for each charging measuring voltage U BM s 7.

Claims

Ansprüche Expectations
Verfahren zur Kalibrierung eines Sensors eines Batteriemanagementsystems (1 ), wobei der Sensor geeignet ist, bei einer Ladung einer zugehörigen Batterie (2) an einer Ladestation (3) einen Ladeparameter zu erfassen, dadurch gekennzeichnet, dass bei einer Ladung der Batterie Method for calibrating a sensor of a battery management system (1), wherein the sensor is suitable for detecting a charging parameter when an associated battery (2) is charged at a charging station (3), characterized in that when the battery is charged
(2) mit einem von der Ladestation (3) bei einer Ladespannung Ustation (5) abgegebenen Ladestrom(2) with a charging current delivered by the charging station (3) at a charging voltage Ustation (5).
I Station (4) I station (4)
- durch die Ladestation (3) der Ladestrom Istation (4) und/oder die Ladespannung Ustation (5) erfasst wird, - the charging current Istation (4) and/or the charging voltage Ustation (5) is detected by the charging station (3),
- der Ladeparameter durch den Sensor des Batteriemanagementsystems (1 ) in Form eines Lademessstroms (6) oder einer Lademessspannung UBMS (7) erfasst wird - The charging parameter is detected by the sensor of the battery management system (1) in the form of a charging measurement current (6) or a charging measurement voltage UBMS (7).
- eine Messdifferenz (8), (9) aus dem Lademessstrom IBMS (6) und dem Ladestrom Station (4) oder der Lademessspannung UBMS (7) und der Ladespannung Ustation (5) ermittelt wird und - a measurement difference (8), (9) is determined from the charging measurement current I B MS (6) and the charging current station (4) or the charging measurement voltage U B MS (7) and the charging voltage Ustation (5) and
- die ermittelte Messdifferenz (8), (9) als Sensorkorrekturwert zur Kalibrierung des Sensors verwendet wird. - the determined measurement difference (8), (9) is used as a sensor correction value to calibrate the sensor.
Verfahren nach Anspruch 1 , dass der Wert des Ladeparameters von der Ladestation Method according to claim 1, that the value of the charging parameter from the charging station
(3) an das Batteriemanagementsystem (1 ) der Batterie (2) übermittelt wird und das Batteriemanagementsystem (1 ) die Berechnung der Messdifferenz (8), (9) vornimmt. (3) is transmitted to the battery management system (1) of the battery (2) and the battery management system (1) calculates the measurement difference (8), (9).
Verfahren nach Anspruch 2, dass die Übermittlung durch ein Handshake- Protokoll abgesichert wird. Method according to claim 2, that the transmission is secured by a handshake protocol.
4. Verfahren nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass sich der Wert des Ladeparameters zeitlich ändert und der Sensorkorrekturwert für verschiedene Werte des Ladeparameters ermittelt wird. 4. Method according to one of the preceding claims, characterized in that the value of the charging parameter changes over time and the sensor correction value is determined for different values of the charging parameter.
5. Verfahren nach Anspruch 4, dadurch gekennzeichnet, dass eine kontinuierliche oder schrittweise Änderung des Wertes des Ladeparameters erfolgt. 5. The method according to claim 4, characterized in that a continuous or stepwise change in the value of the charging parameter takes place.
6. Verfahren nach Anspruch 5, dadurch gekennzeichnet, dass eine schrittweise Änderung eines Ladeparameters nur nach einem erfolgreichen Handshake gemäß Anspruch 3 erfolgt. 6. The method according to claim 5, characterized in that a gradual change of a loading parameter only takes place after a successful handshake according to claim 3.
7. Verfahren nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass die Messdifferenz (8), (9) mit einem Schwellenwert verglichen wird, bei dessen Überschreiten eine Fehlersignalisierung erfolgt. 7. Method according to one of the preceding claims, characterized in that the measurement difference (8), (9) is compared with a threshold value, which, if exceeded, causes an error signal.
8. Verfahren nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass die Durchführung des Verfahrens mit einer Ladespannung Ustation (5) als Ladeparameter erfolgt. 8. Method according to one of the preceding claims, characterized in that the method is carried out with a charging voltage Ustation (5) as a charging parameter.
9. Verfahren nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass die Durchführung des Verfahrens mit einem Ladestrom Istation (4) als Ladeparameter erfolgt. 9. Method according to one of the preceding claims, characterized in that the method is carried out with a charging current Istation (4) as a charging parameter.
10. Verfahren nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass die Durchführung des Verfahrens mit einem negativen Ladestrom Istation (4) bzw. einem Entladestrom als Ladeparameter erfolgt. 10. The method according to one of the preceding claims, characterized in that the method is carried out with a negative charging current Istation (4) or a discharge current as the charging parameter.
1 1 . Batteriemanagementsystem (1 ) für ein eine Batterie (2) aufweisendes Batteriesystem (10), wobei das Batteriemanagementsystem (1 ) einen Sensor aufweist, der geeignet ist, bei einer Ladung der Batterie (2) an einer Ladestation (3) einen Ladeparameter zu erfassen, dadurch gekennzeichnet, dass das Batteriemanagementsystem (1 ) eingerichtet ist, 1 1 . Battery management system (1) for a battery system (10) having a battery (2), the battery management system (1) having a sensor which is suitable for detecting a charging parameter when the battery (2) is being charged at a charging station (3), characterized in that the battery management system (1) is set up,
die Größe einer beim Laden der Batterie (2) mittels einer Ladestation (3) systemextern erfassten Ladespannung Ustation (5) und/oder eines systemextern erfassten Ladestroms Istation (4) einzulesen, - über den Sensor einen Lademessstrom IBMS (6) oder eine Lademessspannung UBMS (7) als Ladeparameter zu erfassen, to read in the size of a charging voltage Ustation (5) recorded externally to the system when charging the battery (2) using a charging station (3) and/or a charging current Istation (4) recorded externally to the system, - to record a charging measurement current I B MS (6) or a charging measurement voltage UBMS (7) as a charging parameter via the sensor,
- eine Messdifferenz (8), (9) aus dem Lademessstrom IBMS (6) und dem Ladestrom Istation (4) oder der Lademessspannung UBMS (7) und der Lade- Spannung Ustation (5) zu ermitteln und - to determine a measurement difference (8), (9) from the charging measurement current I B MS (6) and the charging current Istation (4) or the charging measurement voltage U B MS (7) and the charging voltage Ustation (5) and
- die ermittelte Messdifferenz (8), (9) als Sensorkorrekturwert zur Kalibrierung des Sensors zu verwenden. - use the determined measurement difference (8), (9) as a sensor correction value to calibrate the sensor.
PCT/EP2015/068266 2014-10-02 2015-08-07 Battery management system and method for calibrating a sensor of a battery management system WO2016050403A1 (en)

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