WO2020013745A1 - Method and arrangement for heating a high voltage battery for a vehicle - Google Patents

Method and arrangement for heating a high voltage battery for a vehicle Download PDF

Info

Publication number
WO2020013745A1
WO2020013745A1 PCT/SE2019/050605 SE2019050605W WO2020013745A1 WO 2020013745 A1 WO2020013745 A1 WO 2020013745A1 SE 2019050605 W SE2019050605 W SE 2019050605W WO 2020013745 A1 WO2020013745 A1 WO 2020013745A1
Authority
WO
WIPO (PCT)
Prior art keywords
battery
high voltage
heater
electrical circuit
sli
Prior art date
Application number
PCT/SE2019/050605
Other languages
French (fr)
Inventor
Robert Jadeborg
Mårten ECKERDAL
Gunnar Ledfelt
Original Assignee
Scania Cv Ab
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.)
Filing date
Publication date
Application filed by Scania Cv Ab filed Critical Scania Cv Ab
Publication of WO2020013745A1 publication Critical patent/WO2020013745A1/en

Links

Classifications

    • 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
    • H01M10/486—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for measuring temperature
    • 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
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/62—Heating or cooling; Temperature control specially adapted for specific applications
    • H01M10/625—Vehicles
    • 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
    • B60L58/24—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries
    • B60L58/27—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries by heating
    • 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]
    • B60L58/13—Maintaining the SoC within a determined range
    • 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
    • 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
    • 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
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/61—Types of temperature control
    • H01M10/615—Heating or keeping warm
    • 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
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/63—Control systems
    • H01M10/633—Control systems characterised by algorithms, flow charts, software details or the like
    • 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
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/657—Means for temperature control structurally associated with the cells by electric or electromagnetic means
    • 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
    • B60L2240/545—Temperature
    • 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
    • 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
    • H01M10/46—Accumulators structurally combined with charging apparatus
    • 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
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries

Definitions

  • the present invention relates to a method for heating a high voltage battery for a vehicle.
  • the invention also relates to an arrangement for heating a high voltage battery for a vehicle.
  • the invention also relates to a vehicle.
  • the invention relates to a computer program and a computer program product adapted to implement the method.
  • Electrically powered vehicles and hybrid vehicles powered by electricity in combination with some form of fuel are equipped with at least one high voltage battery for storage of electrical energy.
  • batteries performs poorly at cold temperatures. Specially, cold
  • Cold temperatures affect battery chemistry and increase electrical resistance within the battery. As a result the capacity of a battery to store energy and the maximum value of discharge current which can be drawn from a battery decreases substantially. Cold temperatures may also decrease the life of a battery and therefore increase its replacement frequency.
  • An object of the present invention is to address and at least alleviate the above mentioned problems.
  • a further object is to make it possible to activate the heater when the vehicle is not in operation, i.e. when the ignition is switch off.
  • a further object is to preheat a high voltage battery to a more battery-friendly temperature.
  • a further object is to retard high voltage battery ageing at cold temperatures.
  • a method for heating a high voltage battery for a vehicle comprising an electrical circuit, a battery heater adapted to heat the high voltage battery, a SLI (Starter Lightning Ignition) battery and a heater switch arranged for connecting and disconnecting the battery heater to/from power received from the battery charger.
  • SLI Startter Lightning Ignition
  • the method comprises the steps of connecting the electrical circuit to an external source of electric energy, detecting an establishment of the connection of the electrical circuit to the external source of electric energy, emitting an activating signal, determining if a value for the charging status of the SLI battery is equal to or above a predetermined value, determining if a temperature of the high voltage battery is equal to or below a predetermined value and activating the battery heater when the value for the charging status of the SLI battery is equal to or above the predetermined value and the temperature of the high voltage battery is equal to or below the predetermined value.
  • the method comprises the step of stopping the battery heater if the temperature of the high voltage battery is above the predetermined value.
  • the method comprises the step of the driver/operator of the vehicle being able to enforce starting or stopping high voltage battery heating.
  • the driver/operator of the vehicle it is possible for the driver/operator of the vehicle to take over the control of the heating of the high voltage battery.
  • the method comprises the step of controlling the heater switch based on information from a detecting device.
  • the arrangement comprises an electrical circuit, a battery heater adapted to heat the high voltage battery, a SLI (Starter Lightning Ignition) battery and a heater switch arranged for connecting and disconnecting the battery heater to/from power received from the SLI battery.
  • the arrangement comprises a detecting device connected to the electrical circuit, which detecting device comprises means adapted to detect an establishment of a connection of the electrical circuit to an external source of electric energy and adapted to activate the battery heater when the electrical circuit is connected to the external source of electric energy.
  • the detecting device may be adapted to emit information when connected to the external source of electric energy.
  • the information may comprise a signal, such as a wake up signal or a trigger signal, which may be adapted to activate the battery heater despite of the vehicle being not in operation i.e. when the ignition is switched off. This makes it possible to preheat the high voltage battery to a more battery-friendly temperature before starting the vehicle, causing the high voltage battery to run more efficiently when started and thereby retard battery aging at cold temperatures.
  • a signal such as a wake up signal or a trigger signal
  • the detecting device is connected to the heater switch.
  • the heater switch is adapted to be controlled by information from the detecting device. Thanks to these provisions it is possible to detect, in a simple and reliable way, an external source of electric energy and activate the heater despite of the vehicle being not in operation.
  • control unit arranged between the detecting device and the heater switch and the control unit is adapted to control the heater switch based on information from the detecting device. Thanks to these provisions it is possible to process inputs to determine whether the high voltage battery should be heated or not. These inputs may for example include high voltage battery temperature and /or SLI battery voltage.
  • At least one temperature sensor is connected to the control unit to provide high voltage battery temperature to the control unit. Hereby it is possible to start the battery heater only when heating is necessary.
  • at least one voltage sensor may be connected to the control unit to provide SLI battery voltage to the control unit. Hereby it is possible to determine the charging status of the SLI battery and to determine if there is enough energy available in the SLI battery or if the SLI battery needs to be charged.
  • the means adapted to detect the connection comprises a relay adapted to close a contact switch, in which the relay is arranged in the detecting device, upon a connection of the electrical circuit to the external source of electric energy.
  • the electrical circuit comprises a charging unit adapted to charge the SLI battery.
  • a charging unit adapted to charge the SLI battery.
  • Using a charging unit makes it possible to charge the SLI battery before the battery heater is activated or to heat the high voltage battery simultaneously as charging the SLI battery, when the vehicle is not in operation. But it is also possible to heat the high voltage battery only by the use of the invention.
  • a vehicle comprising an arrangement for heating a high voltage battery according to what is mentioned above.
  • a computer program comprising program code, which program, when the program code is executed in a computer, causes the computer to effect the methods mentioned above.
  • the invention also relates to a computer program product comprising a data storage medium which can be read by the computer and on which the program code of a computer program is stored.
  • Fig. 1 is a schematic view of a hybrid vehicle.
  • Fig. 2 is a schematic view of a control unit shown in fig.1.
  • Fig. 3 is a flowchart of an embodiment of the invention.
  • Fig.1 shows schematically a hybrid vehicle 1 comprising a hybrid controller 2, an electrical machine 3 and an internal combustion engine 4.
  • the hybrid vehicle 1 further comprises a high voltage battery 5 and a SLI (Starting, Lighting, Ignition-battery) battery 6.
  • the high voltage battery 5 is arranged for providing power for the propulsion of the hybrid vehicle 1.
  • the high voltage battery 5 is connected to the electrical machine 3.
  • the SLI battery 6 is arranged to provide power for a low voltage DC system of the hybrid vehicle 1, including providing power to loads 28, including accessories 7 and a start motor 8 for the internal combustion engine 4.
  • the accessories 7 may for example be electrical controllers, windshield wipers, lamps, air conditioners etc..
  • the high voltage battery 5 has a high DC level voltage, such as for example 400 V or 800 V, higher than the SLI battery 6, which supplies DC at a low voltage e.g. 12 or 24 V. Further, the high voltage battery 5 and/or the SLI battery 6 may be a single battery or a battery pack comprising multiple batteries that are electrically connected to each other. At some embodiments the high voltage battery 5 may be a battery of an electrically powered vehicle.
  • the hybrid vehicle 1 shown in Fig .1 also comprises traction wheels 11, a gearbox 9 and a differential gear 10.
  • the high voltage battery 5 may have an optimal operating temperature. At higher and lower temperatures the efficiency of the high voltage battery 5 may be reduced. The high voltage battery 5 may therefore need to be heated at times when it is at too low a temperature and cooled when it is at too high a temperature. When the high voltage battery 5 needs heating this can be effected by means of a battery heater 12 which may be an electrical component or coolant from the cooling system which cools the internal combustion engine 4.
  • the hybrid controller 2 which may be an Electronic Control Unit (ECU), may be adapted to monitor and control various aspects of the hybrid vehicle 1.
  • the hybrid controller 2 may be connected to the internal combustion engine 4 and the electrical machine 3 to monitor and control their operation and performance.
  • the hybrid controller 2 may also be connected to the high voltage battery 5 or to a regulating equipment (not shown) connected to the high voltage battery 5 to regulate the flow of electrical energy between the high voltage battery 5 and the electrical machine 3 and to control the charging of the high voltage battery 5 when the electrical machine 3 serves as a generator.
  • the hybrid controller 2 may, which is not shown in the figure, be connected to the battery heater 12 and adapted to start or stop the battery heater 12 depending on the temperature of the high voltage battery 5 when the hybrid vehicle 1 is in operation.
  • the hybrid vehicle 1 comprises an arrangement for heating the high voltage battery 5 when the hybrid vehicle 1 is not in operation.
  • the arrangement may comprise a control unit 13 adapted to start or stop the battery heater 12 when the hybrid vehicle 1 is not in operation, e.g. when parked.
  • the control unit 13 may be adapted to process inputs to determine whether the high voltage battery 5 should be heated or not. These inputs may include high voltage battery temperature and/or SLI battery voltage.
  • Battery temperature may be provided by a battery temperature sensor 14 located on the high voltage battery 5.
  • multiple temperature sensors 14 may be usedv
  • Battery voltage may be provided by a voltage sensor 17 located on the SLI battery 6.
  • the control unit 13 may contain an internal voltage sensor accurate enough to approximate the SLI battery voltage to this internal voltage in the control unit 13.
  • a heater switch 15 may be arranged between the SLI battery 6 and the battery heater 12, which heater switch 15 is arranged for connecting and disconnecting the battery heater 12 to/from power received from the charging unit 22, i.e. to start or stop the battery heater 12.
  • the heater switch 15 is connected to the control unit 13 and is adapted to be controlled by information from the control unit 13.
  • Fig. 1 further shows that the hybrid vehicle 1 may be provided with a charging socket 18 for plugging in a cable 19 and connecting it to an electrical circuit 20 in the vehicle 1 for feeding electric energy there through from an external source of electric energy 21, e.g. at a charging station, to the electrical circuit 20.
  • the electrical circuit 20 comprises a charging unit 22 connected to the SLI battery 6 and adapted to charge the SLI battery 6.
  • the electrical circuit 20 may comprise an interior heating unit 49 adapted to heat the interior of the vehicle 1, i.e. its driver and passenger compartment and/or its cargo space.
  • the electrical circuit 20 may comprise an engine heating unit 50 adapted to heat the internal combustion engine of the vehicle 1.
  • the socket 18 may be arranged at the front 23 of the vehicle 1 and the external source of electric energy 21 may be a 230 V supply network.
  • control unit 13 may be adapted to monitor the SLI battery 6 and/or the charging unit 22 during a charging process and to determine how the energy from the charging unit 22 may be used, e.g. if the energy may be used to charge the SLI battery 6 and provide power to some crucial accessories 29 only, while the start of the battery heater 12 is delayed until the voltage of the SLI battery 6 is equal to or above a threshold voltage value, or if the energy may be used to start the battery heater 12 as soon as the electrical circuit 20 is connected to the external source of energy 21.
  • the crucial accessories 29 may for example be security systems, key fob sensors and memories in control units.
  • control unit 13 may be adapted to monitor the SLI battery 6 and/or the charging unit 22 and to, when the charging process has been interrupted but the hybrid vehicle 1 is still not in operation, determine how the energy from the SLI battery 6 may be used.
  • the charging process may for example have been interrupted by a timer after a predetermined charging time has elapsed or after a fuse has blown in the charging station or in the vehicle.
  • the control unit 13 may be adapted to for example allow accessories 7 in general or crucial accessories 29 in particular to discharge the SLI battery 6 and/or allow the battery heater 12 to discharge the SLI battery 6.
  • the discharge may be allowed if the voltage of the SLI battery 6 is equal to or above the threshold voltage value.
  • the arrangement for heating the hybrid battery 5 comprises a detecting device 24 connected to the electrical circuit 20.
  • the detecting device 24 comprises means 27 adapted to detect an establishment of a connection of the electrical circuit 20 to the external source of electric energy 21, by the cable 19, and adapted to activate the battery heater 12 when the electrical circuit 20 is connected to the external source of electric energy 21.
  • the detecting device may be adapted to emit information 47 when connected to the external source of electric energy 21.
  • the information 47 may comprise a signal, such as a wake up signal or a trigger signal, which may be adapted to activate, wake or trigger the battery heater despite of the vehicle being not in operation i.e. when the ignition is switched off.
  • the detecting device 24 can detect the connection. E.g. by using an optical transmitter.
  • Fig. 2 shows schematically the control unit 13 in fig. 1.
  • the control unit 13 is adapted to control the heater switch 15 based upon information 47 from the detecting device 24.
  • the control unit 13 comprises a calculation unit 40 which may take the form of substantially any suitable type of processor or microcomputer, e.g. a circuit for digital signal processing (digital signal processor, DSP) or a circuit with a predetermined specific function (application specific integrated circuit, ASIC).
  • the calculation unit 40 is connected to a memory unit 41 which may be incorporated in the control unit 13 and which provides the calculation unit 40 with, for example, the stored program code and/or the stored data which the calculation unit 40 needs in order to be able to perform calculations.
  • the calculation unit 40 is also adapted to store partial or final results of calculations in the memory unit 41.
  • the control unit 13 is provided with devices 42, 43, 44 for receiving input signals and a device 46 for sending an output signal.
  • These input and output signals may comprise waveforms, pulses or other attributes which the signal receiving devices 42, 43, 44 can detect as information and which can be converted to signals processable by the calculation unit 40.
  • the calculation unit 40 is adapted to receive the input signals and the signal sending device 46 is adapted to convert the signals received from the calculation unit 40 in order to create, e.g. by modulating the signals, an output signal which can be transmitted to the heater switch 15.
  • Each of the connections to the devices 42, 43, 44 for receiving input signals and the device 46 for sending output signals may take the form of one or more from among the following: cable, data bus, e.g. a CAN (controller area network) bus, a MOST (media orientated systems transport) bus or some other bus configuration, or a wireless connection.
  • control unit 13 may depend on signals from various sensors or signals from one or more additional control units.
  • Information 47 concerning the establishment of a connection of the electrical circuit 20 to the external source of energy 21 may for example be provided by the detecting device 24.
  • High voltage battery temperature may for example be provided by the temperature sensor 14 and SLI battery voltage may for example be provided by the voltage sensor 17.
  • the monitoring and/or control of different functions in the vehicle may be implemented in a computer program comprising program code, which program, when the program code is executed in a computer, causes the computer to effect the monitoring and/or control.
  • the computer program is contained in a computer program product’s computer-readable data storage medium which takes the form of a suitable memory, e.g. ROM (read-only memory), PROM (programmable read-only memory), EPROM (erasable PROM), flash memory, EEPROM (electrically erasable PROM), hard disc unit, etc.
  • the suitable memory may be the memory unit 41 which may be incorporated in the control unit 13.
  • Fig. 3 shows a flow chart of a method according to an embodiment of the invention carried out for heating a high voltage battery 5 for a vehicle 1.
  • the method includes a step 55 of connecting the electrical circuit 20 to the external source of electric energy 21.
  • a step 56 it is detected an establishment of the connection of the electrical circuit 20 to the external source of electric energy 21, when such a connection occurs.
  • information 47 is emitted as a confirmation that the electrical circuit 20 is connected to the external source of electric energy 21.
  • a value for the charging status of the SLI battery 6 is determined. The value for the charging status may be detected by sensing if a voltage of the SLI battery 6 is equal to or above a predetermined threshold value.
  • the threshold voltage value may be a predetermined constant based on battery specifications that is programed into the memory unit 41 (fig. 2) of the control unit 13. If the voltage of the SLI battery 6 is equal to or above the predetermined threshold voltage value i.e. high there may be enough energy in the SLI battery 6 to power the battery heater 12. If the voltage of the SLI battery 6 is below the predetermined threshold voltage value i.e. low the SLI battery 6 may be charged by the charging unit 22 in a step 59. In a step 60 a temperature is determined. The temperature may be detected by sensing if the temperature of the high voltage battery 5 is equal to or below a predetermined threshold value. The threshold temperature value may be a predetermined constant that is programed into the memory unit 41 (fig.2) of the control unit 13. If the value for the charging status of the SLI battery 6 is equal to or above the
  • the predetermined value and the temperature of the high voltage battery 5- is equal to or below the threshold temperature value i.e. low, heating is desired and the method continues at step 61 by activating the battery heater 12. If the temperature is above the threshold value i.e. high, efforts to increase the temperature of the high voltage battery 5 may be unnecessary.
  • the battery heater 12 may by stopped after a predetermined time period, for example by a timer or by a predetermined time value that is programed into the memory unit 41 (fig.2).
  • the method may comprise a step 62 in which a temperature may be detected. The temperature may be detected by sensing if the temperature of the high voltage battery 5 is equal to or below a predetermined threshold value.
  • the threshold temperature value may be a predetermined constant that is programed into the memory unit 41 (fig.2) of the control unit 13. If the temperature is equal to or below the threshold temperature value i.e. low, additional heating is desired and the method continues at step 63 by maintaining the heating. If the temperature is above the predetermined threshold value i.e. high, efforts to increase the temperature of the high voltage battery 5 may be unnecessary and the battery heater 12 is stopped in a step 54.
  • the method described can of course be extended to comprise over ride functions by the driver/operator to enforce starting or stopping high voltage battery heating, namely in that the driver/operator of the vehicle being able to enforce starting or stopping high voltage battery heating by the use of e.g. a push button (not shown in figure).
  • the method makes it possible to start the battery heater only when additional heating is necessary and despite of the vehicle being not in operation i.e. when the ignition is switched off. This makes it is possible to preheat the battery to a more battery-friendly temperature before starting the vehicle, causing the battery to run more efficiently when started and thereby retard battery aging at cold temperatures.
  • the present invention is not limited to the embodiments described above, but relates to and comprises all embodiments within the scope of protection of the attached independent claims.
  • the vehicle is described as a hybrid vehicle but it may be an electrical vehicle.
  • the vehicle may for example be a truck, a bus or a passenger car. Further, the vehicle may be a commercial vehicle or a constructional vehicle or the like.
  • the hybrid vehicle 1 comprises a control system that may consist of a communication bus system (not shown) consisting of one or more communication buses that serves as
  • a control system of this kind may comprise a large number of controllers and control units, and the responsibility for a specific function may be divided amongst two or more controllers or control units.
  • fig. 1 only shows two
  • controllers/control units 2, 13 but in reality the control of a specific function may depend on information which may be received from one or more further controllers or control units.
  • the term“comprising” or“comprises” does not exclude other features, elements, steps, components, functions or groups thereof. Further, the indefinite article “a” or “an” does not exclude a plurality.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Sustainable Energy (AREA)
  • Sustainable Development (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Power Engineering (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Automation & Control Theory (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Secondary Cells (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)

Abstract

A method and an arrangement for heating a high voltage battery (5) for a vehicle (1). The arrangement comprises an electrical circuit (20), a battery heater (12) adapted to heat the high voltage battery (5), a SLI (Starter Lightning Ignition) battery (6) and a heater switch (15) arranged for connecting and disconnecting the battery heater (12) to/from power received from the SLI battery (6). A detecting device (24) is adapted to detect an establishment of a connection of the electrical circuit (20) to an external source of electric energy (21) and adapted to activate the battery heater (12) when the electrical circuit (20) is connected to the external source of electric energy (21).

Description

Method and arrangement for heating a high voltage battery for a vehicle
TECHNICAL FIELD
The present invention relates to a method for heating a high voltage battery for a vehicle. The invention also relates to an arrangement for heating a high voltage battery for a vehicle. The invention also relates to a vehicle. Further, the invention relates to a computer program and a computer program product adapted to implement the method.
BACKGROUND
Electrically powered vehicles and hybrid vehicles powered by electricity in combination with some form of fuel are equipped with at least one high voltage battery for storage of electrical energy. In general, batteries performs poorly at cold temperatures. Specially, cold
temperatures affect battery chemistry and increase electrical resistance within the battery. As a result the capacity of a battery to store energy and the maximum value of discharge current which can be drawn from a battery decreases substantially. Cold temperatures may also decrease the life of a battery and therefore increase its replacement frequency.
Current methods of operating high voltage batteries at low temperatures employ means for heating the high voltage battery by a heater adapted to be activated by the vehicle’s low voltage electrical system. A problem with such a method is that it is only possible to run the heater when the vehicle is in operation, i.e. when the ignition is switched on. When the vehicle is not in operation and the ignition is switched off the electrical system is normally shut off and the heater is therefore disconnected. When such a vehicle is started the high voltage battery may be at a temperature below its optimal operating temperature and it may take some time for the high voltage battery to reach its optimal operating temperature, causing the high voltage battery to run less efficiently. Improvements in the field of heating high voltage batteries are therefore desirable. SUMMARY
An object of the present invention is to address and at least alleviate the above mentioned problems. A further object is to make it possible to activate the heater when the vehicle is not in operation, i.e. when the ignition is switch off. A further object is to preheat a high voltage battery to a more battery-friendly temperature. A further object is to retard high voltage battery ageing at cold temperatures.
In accordance with the present invention there is provided a method for heating a high voltage battery for a vehicle comprising an electrical circuit, a battery heater adapted to heat the high voltage battery, a SLI (Starter Lightning Ignition) battery and a heater switch arranged for connecting and disconnecting the battery heater to/from power received from the battery charger. The method comprises the steps of connecting the electrical circuit to an external source of electric energy, detecting an establishment of the connection of the electrical circuit to the external source of electric energy, emitting an activating signal, determining if a value for the charging status of the SLI battery is equal to or above a predetermined value, determining if a temperature of the high voltage battery is equal to or below a predetermined value and activating the battery heater when the value for the charging status of the SLI battery is equal to or above the predetermined value and the temperature of the high voltage battery is equal to or below the predetermined value. This makes it possible to determine whether the high voltage battery should be heated or not and thereby only heating the high voltage battery when needed.
According to an optional aspect of the invention the method comprises the step of stopping the battery heater if the temperature of the high voltage battery is above the predetermined value. Hereby it is possible to only heat the high voltage battery when heating is necessary and that the heating is stopped when no longer needed.
According to an optional aspect of the invention the method comprises the step of the driver/operator of the vehicle being able to enforce starting or stopping high voltage battery heating. Hereby it is possible for the driver/operator of the vehicle to take over the control of the heating of the high voltage battery.
According to an optional aspect of the invention the method comprises the step of controlling the heater switch based on information from a detecting device. The advantages of the method appears from the above discussion of the arrangement according to the invention and different embodiments thereof.
In accordance with the present invention there is also an arrangement provided for heating a high voltage battery for a vehicle. The arrangement comprises an electrical circuit, a battery heater adapted to heat the high voltage battery, a SLI (Starter Lightning Ignition) battery and a heater switch arranged for connecting and disconnecting the battery heater to/from power received from the SLI battery. Further the arrangement comprises a detecting device connected to the electrical circuit, which detecting device comprises means adapted to detect an establishment of a connection of the electrical circuit to an external source of electric energy and adapted to activate the battery heater when the electrical circuit is connected to the external source of electric energy. The detecting device may be adapted to emit information when connected to the external source of electric energy. The information may comprise a signal, such as a wake up signal or a trigger signal, which may be adapted to activate the battery heater despite of the vehicle being not in operation i.e. when the ignition is switched off. This makes it possible to preheat the high voltage battery to a more battery-friendly temperature before starting the vehicle, causing the high voltage battery to run more efficiently when started and thereby retard battery aging at cold temperatures.
According to an optional aspect of the invention the detecting device is connected to the heater switch. The heater switch is adapted to be controlled by information from the detecting device. Thanks to these provisions it is possible to detect, in a simple and reliable way, an external source of electric energy and activate the heater despite of the vehicle being not in operation.
According to an optional aspect of the invention there is a control unit arranged between the detecting device and the heater switch and the control unit is adapted to control the heater switch based on information from the detecting device. Thanks to these provisions it is possible to process inputs to determine whether the high voltage battery should be heated or not. These inputs may for example include high voltage battery temperature and /or SLI battery voltage.
At some embodiments at least one temperature sensor is connected to the control unit to provide high voltage battery temperature to the control unit. Hereby it is possible to start the battery heater only when heating is necessary. At some embodiments at least one voltage sensor may be connected to the control unit to provide SLI battery voltage to the control unit. Hereby it is possible to determine the charging status of the SLI battery and to determine if there is enough energy available in the SLI battery or if the SLI battery needs to be charged.
According to an optional aspect of the invention the means adapted to detect the connection comprises a relay adapted to close a contact switch, in which the relay is arranged in the detecting device, upon a connection of the electrical circuit to the external source of electric energy. This constitutes a simple and reliable way for detecting the connection of electric energy to the electrical circuit.
According to an optional aspect of the invention the electrical circuit comprises a charging unit adapted to charge the SLI battery. Using a charging unit makes it possible to charge the SLI battery before the battery heater is activated or to heat the high voltage battery simultaneously as charging the SLI battery, when the vehicle is not in operation. But it is also possible to heat the high voltage battery only by the use of the invention.
In accordance with the present invention there is also provided a vehicle comprising an arrangement for heating a high voltage battery according to what is mentioned above.
In accordance with the present invention there is also provided a computer program comprising program code, which program, when the program code is executed in a computer, causes the computer to effect the methods mentioned above. The invention also relates to a computer program product comprising a data storage medium which can be read by the computer and on which the program code of a computer program is stored. It is to be understood that both the foregoing general description and the following detailed description are exemplary and are intended to provide further explanation of the invention as claimed. Further features of, and advantages with, the present invention will become apparent when studying the appended claims and the following detailed description.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will now be described in greater detail with reference to the accompanying drawings in which:
Fig. 1 is a schematic view of a hybrid vehicle.
Fig. 2 is a schematic view of a control unit shown in fig.1.
Fig. 3 is a flowchart of an embodiment of the invention.
DETAILED DESCRIPTION
The invention will now be described with reference to the drawings in which some exemplary embodiment are shown. Well-known functions or constructions will not necessarily be described in detail for brevity and/or clarity.
Fig.1 shows schematically a hybrid vehicle 1 comprising a hybrid controller 2, an electrical machine 3 and an internal combustion engine 4. The hybrid vehicle 1 further comprises a high voltage battery 5 and a SLI (Starting, Lighting, Ignition-battery) battery 6. The high voltage battery 5 is arranged for providing power for the propulsion of the hybrid vehicle 1. The high voltage battery 5 is connected to the electrical machine 3. The SLI battery 6 is arranged to provide power for a low voltage DC system of the hybrid vehicle 1, including providing power to loads 28, including accessories 7 and a start motor 8 for the internal combustion engine 4. The accessories 7 may for example be electrical controllers, windshield wipers, lamps, air conditioners etc.. The high voltage battery 5 has a high DC level voltage, such as for example 400 V or 800 V, higher than the SLI battery 6, which supplies DC at a low voltage e.g. 12 or 24 V. Further, the high voltage battery 5 and/or the SLI battery 6 may be a single battery or a battery pack comprising multiple batteries that are electrically connected to each other. At some embodiments the high voltage battery 5 may be a battery of an electrically powered vehicle. The hybrid vehicle 1 shown in Fig .1 also comprises traction wheels 11, a gearbox 9 and a differential gear 10.
The high voltage battery 5 may have an optimal operating temperature. At higher and lower temperatures the efficiency of the high voltage battery 5 may be reduced. The high voltage battery 5 may therefore need to be heated at times when it is at too low a temperature and cooled when it is at too high a temperature. When the high voltage battery 5 needs heating this can be effected by means of a battery heater 12 which may be an electrical component or coolant from the cooling system which cools the internal combustion engine 4.
The hybrid controller 2, which may be an Electronic Control Unit (ECU), may be adapted to monitor and control various aspects of the hybrid vehicle 1. For example, the hybrid controller 2 may be connected to the internal combustion engine 4 and the electrical machine 3 to monitor and control their operation and performance. The hybrid controller 2 may also be connected to the high voltage battery 5 or to a regulating equipment (not shown) connected to the high voltage battery 5 to regulate the flow of electrical energy between the high voltage battery 5 and the electrical machine 3 and to control the charging of the high voltage battery 5 when the electrical machine 3 serves as a generator. Further, the hybrid controller 2 may, which is not shown in the figure, be connected to the battery heater 12 and adapted to start or stop the battery heater 12 depending on the temperature of the high voltage battery 5 when the hybrid vehicle 1 is in operation.
Further, the hybrid vehicle 1 comprises an arrangement for heating the high voltage battery 5 when the hybrid vehicle 1 is not in operation. The arrangement may comprise a control unit 13 adapted to start or stop the battery heater 12 when the hybrid vehicle 1 is not in operation, e.g. when parked. The control unit 13 may be adapted to process inputs to determine whether the high voltage battery 5 should be heated or not. These inputs may include high voltage battery temperature and/or SLI battery voltage. Battery temperature may be provided by a battery temperature sensor 14 located on the high voltage battery 5. Alternatively, multiple temperature sensors 14 may be usedv Battery voltage may be provided by a voltage sensor 17 located on the SLI battery 6. Alternatively the control unit 13 may contain an internal voltage sensor accurate enough to approximate the SLI battery voltage to this internal voltage in the control unit 13. Further, a heater switch 15 may be arranged between the SLI battery 6 and the battery heater 12, which heater switch 15 is arranged for connecting and disconnecting the battery heater 12 to/from power received from the charging unit 22, i.e. to start or stop the battery heater 12. The heater switch 15 is connected to the control unit 13 and is adapted to be controlled by information from the control unit 13.
Fig. 1 further shows that the hybrid vehicle 1 may be provided with a charging socket 18 for plugging in a cable 19 and connecting it to an electrical circuit 20 in the vehicle 1 for feeding electric energy there through from an external source of electric energy 21, e.g. at a charging station, to the electrical circuit 20. The electrical circuit 20 comprises a charging unit 22 connected to the SLI battery 6 and adapted to charge the SLI battery 6. At some embodiments the electrical circuit 20 may comprise an interior heating unit 49 adapted to heat the interior of the vehicle 1, i.e. its driver and passenger compartment and/or its cargo space. At some embodiments the electrical circuit 20 may comprise an engine heating unit 50 adapted to heat the internal combustion engine of the vehicle 1. Further, the socket 18 may be arranged at the front 23 of the vehicle 1 and the external source of electric energy 21 may be a 230 V supply network.
At some embodiments the control unit 13 may be adapted to monitor the SLI battery 6 and/or the charging unit 22 during a charging process and to determine how the energy from the charging unit 22 may be used, e.g. if the energy may be used to charge the SLI battery 6 and provide power to some crucial accessories 29 only, while the start of the battery heater 12 is delayed until the voltage of the SLI battery 6 is equal to or above a threshold voltage value, or if the energy may be used to start the battery heater 12 as soon as the electrical circuit 20 is connected to the external source of energy 21. The crucial accessories 29 may for example be security systems, key fob sensors and memories in control units.
At some embodiments the control unit 13 may be adapted to monitor the SLI battery 6 and/or the charging unit 22 and to, when the charging process has been interrupted but the hybrid vehicle 1 is still not in operation, determine how the energy from the SLI battery 6 may be used. The charging process may for example have been interrupted by a timer after a predetermined charging time has elapsed or after a fuse has blown in the charging station or in the vehicle. At such an interruption the control unit 13 may be adapted to for example allow accessories 7 in general or crucial accessories 29 in particular to discharge the SLI battery 6 and/or allow the battery heater 12 to discharge the SLI battery 6. At some embodiments the discharge may be allowed if the voltage of the SLI battery 6 is equal to or above the threshold voltage value.
The arrangement for heating the hybrid battery 5 comprises a detecting device 24 connected to the electrical circuit 20. The detecting device 24 comprises means 27 adapted to detect an establishment of a connection of the electrical circuit 20 to the external source of electric energy 21, by the cable 19, and adapted to activate the battery heater 12 when the electrical circuit 20 is connected to the external source of electric energy 21. The detecting device may be adapted to emit information 47 when connected to the external source of electric energy 21. The information 47 may comprise a signal, such as a wake up signal or a trigger signal, which may be adapted to activate, wake or trigger the battery heater despite of the vehicle being not in operation i.e. when the ignition is switched off.
There are several ways for the detecting device 24 to detect the connection. E.g. by using an optical transmitter.
Fig. 2 shows schematically the control unit 13 in fig. 1. The control unit 13 is adapted to control the heater switch 15 based upon information 47 from the detecting device 24. The control unit 13 comprises a calculation unit 40 which may take the form of substantially any suitable type of processor or microcomputer, e.g. a circuit for digital signal processing (digital signal processor, DSP) or a circuit with a predetermined specific function (application specific integrated circuit, ASIC). The calculation unit 40 is connected to a memory unit 41 which may be incorporated in the control unit 13 and which provides the calculation unit 40 with, for example, the stored program code and/or the stored data which the calculation unit 40 needs in order to be able to perform calculations. The calculation unit 40 is also adapted to store partial or final results of calculations in the memory unit 41.
The control unit 13 is provided with devices 42, 43, 44 for receiving input signals and a device 46 for sending an output signal. These input and output signals may comprise waveforms, pulses or other attributes which the signal receiving devices 42, 43, 44 can detect as information and which can be converted to signals processable by the calculation unit 40. The calculation unit 40 is adapted to receive the input signals and the signal sending device 46 is adapted to convert the signals received from the calculation unit 40 in order to create, e.g. by modulating the signals, an output signal which can be transmitted to the heater switch 15. Each of the connections to the devices 42, 43, 44 for receiving input signals and the device 46 for sending output signals may take the form of one or more from among the following: cable, data bus, e.g. a CAN (controller area network) bus, a MOST (media orientated systems transport) bus or some other bus configuration, or a wireless connection.
The function of the control unit 13 may depend on signals from various sensors or signals from one or more additional control units. Information 47 concerning the establishment of a connection of the electrical circuit 20 to the external source of energy 21 (fig.1) may for example be provided by the detecting device 24. High voltage battery temperature may for example be provided by the temperature sensor 14 and SLI battery voltage may for example be provided by the voltage sensor 17.
The monitoring and/or control of different functions in the vehicle, such as for example the monitoring and/or control of the heater switch 15, may be implemented in a computer program comprising program code, which program, when the program code is executed in a computer, causes the computer to effect the monitoring and/or control. The computer program is contained in a computer program product’s computer-readable data storage medium which takes the form of a suitable memory, e.g. ROM (read-only memory), PROM (programmable read-only memory), EPROM (erasable PROM), flash memory, EEPROM (electrically erasable PROM), hard disc unit, etc. The suitable memory may be the memory unit 41 which may be incorporated in the control unit 13.
The text below refers to figs.l and 3. Fig. 3 shows a flow chart of a method according to an embodiment of the invention carried out for heating a high voltage battery 5 for a vehicle 1. The method includes a step 55 of connecting the electrical circuit 20 to the external source of electric energy 21. In a step 56 it is detected an establishment of the connection of the electrical circuit 20 to the external source of electric energy 21, when such a connection occurs. In a step 57 information 47 is emitted as a confirmation that the electrical circuit 20 is connected to the external source of electric energy 21. In a step 58 a value for the charging status of the SLI battery 6 is determined. The value for the charging status may be detected by sensing if a voltage of the SLI battery 6 is equal to or above a predetermined threshold value. The threshold voltage value may be a predetermined constant based on battery specifications that is programed into the memory unit 41 (fig. 2) of the control unit 13. If the voltage of the SLI battery 6 is equal to or above the predetermined threshold voltage value i.e. high there may be enough energy in the SLI battery 6 to power the battery heater 12. If the voltage of the SLI battery 6 is below the predetermined threshold voltage value i.e. low the SLI battery 6 may be charged by the charging unit 22 in a step 59. In a step 60 a temperature is determined. The temperature may be detected by sensing if the temperature of the high voltage battery 5 is equal to or below a predetermined threshold value. The threshold temperature value may be a predetermined constant that is programed into the memory unit 41 (fig.2) of the control unit 13. If the value for the charging status of the SLI battery 6 is equal to or above the
predetermined value and the temperature of the high voltage battery 5-is equal to or below the threshold temperature value i.e. low, heating is desired and the method continues at step 61 by activating the battery heater 12. If the temperature is above the threshold value i.e. high, efforts to increase the temperature of the high voltage battery 5 may be unnecessary.
At some embodiments the battery heater 12 may by stopped after a predetermined time period, for example by a timer or by a predetermined time value that is programed into the memory unit 41 (fig.2). At some embodiments the method may comprise a step 62 in which a temperature may be detected. The temperature may be detected by sensing if the temperature of the high voltage battery 5 is equal to or below a predetermined threshold value. The threshold temperature value may be a predetermined constant that is programed into the memory unit 41 (fig.2) of the control unit 13. If the temperature is equal to or below the threshold temperature value i.e. low, additional heating is desired and the method continues at step 63 by maintaining the heating. If the temperature is above the predetermined threshold value i.e. high, efforts to increase the temperature of the high voltage battery 5 may be unnecessary and the battery heater 12 is stopped in a step 54.
The method described can of course be extended to comprise over ride functions by the driver/operator to enforce starting or stopping high voltage battery heating, namely in that the driver/operator of the vehicle being able to enforce starting or stopping high voltage battery heating by the use of e.g. a push button (not shown in figure).
The method makes it possible to start the battery heater only when additional heating is necessary and despite of the vehicle being not in operation i.e. when the ignition is switched off. This makes it is possible to preheat the battery to a more battery-friendly temperature before starting the vehicle, causing the battery to run more efficiently when started and thereby retard battery aging at cold temperatures.
The present invention is not limited to the embodiments described above, but relates to and comprises all embodiments within the scope of protection of the attached independent claims. The vehicle is described as a hybrid vehicle but it may be an electrical vehicle. The vehicle may for example be a truck, a bus or a passenger car. Further, the vehicle may be a commercial vehicle or a constructional vehicle or the like.
The hybrid vehicle 1 comprises a control system that may consist of a communication bus system (not shown) consisting of one or more communication buses that serves as
connections between electronic control units, controllers, and components located on the vehicle. A control system of this kind may comprise a large number of controllers and control units, and the responsibility for a specific function may be divided amongst two or more controllers or control units. For the sake of simplicity, fig. 1 only shows two
controllers/control units 2, 13 but in reality the control of a specific function may depend on information which may be received from one or more further controllers or control units. As used herein, the term“comprising” or“comprises” does not exclude other features, elements, steps, components, functions or groups thereof. Further, the indefinite article "a" or "an" does not exclude a plurality.

Claims

1. A method for heating a high voltage battery (5) for a vehicle (1) comprising an
electrical circuit (20), a battery heater (12) adapted to heat the high voltage battery (5), a SLI battery (6) and a heater switch (15) arranged for connecting and disconnecting the battery heater (12) to/from power received from the SLI battery (6), characterized in that the method comprises the steps of:
- connecting the electrical circuit (20) to an external source of electric energy (21),
- detecting an establishment of the connection of the electrical circuit (20) to the external source of electric energy (21),
- emitting information (47),
- determining if a value for the charging status of the SLI battery (6) is equal to or above a predetermined value,
- determining if a temperature of the high voltage battery (5) is equal to or below a predetermined value and
- activating the battery heater (12) when the value for the charging status of the SLI battery (6) is equal to or above the predetermined value and the temperature of the high voltage battery (5) is equal to or below the predetermined value.
2. A method according to claim 1, characterized in that the method comprises the step of:
- stopping the battery heater (12) if the temperature of the high voltage battery (5) is above the predetermined value.
3. A method according to claim 1 or 2, characterized in that the method comprises the step of:
- controlling the heater switch (15) based on information from a detecting device (24).
4. An arrangement for heating a high voltage battery (5) for a vehicle (1) comprising an electrical circuit (20), a battery heater (12) adapted to heat the high voltage battery (5), a SLI battery (6) and a heater switch (15) arranged for connecting and disconnecting the battery heater (12) to/from power received from the SLI battery (6), characterized in that the arrangement comprises a detecting device (24) connected to the electrical circuit (20), which detecting device (24) comprises means (27) adapted to detect an establishment of a connection of the electrical circuit (20) to an external source of electric energy (21) and adapted to activate the battery heater (12) when the electrical circuit (20) is connected to the external source of electric energy (21).
5. An arrangement according to claim 4, characterized in that the detecting device (24) is connected to the heater switch (15), wherein the heater switch (15) is adapted to be controlled by information from the detecting device (24).
6. An arrangement according to claim 5, characterized in that a control unit (13) is
arranged between the detecting device (24) and the heater switch (15) and that the control unit (13) is adapted to control the heater switch (15) based on information from the detecting device (24).
7. An arrangement according to claim 6, characterized in that at least one battery
temperature sensor (14) is connected to the control unit (13) to provide high voltage battery temperature to the control unit (13).
8. An arrangement according to claim 6, characterized in that at least one voltage sensor (17) is connected to the control unit (13) to provide SLI battery voltage to the control unit (13).
9. An arrangement according to claim 4, characterized in that the means (27) adapted to detect the connection comprises a relay (30) adapted to close a contact switch, in which the relay (30) is arranged in the detecting device (24), upon a connection of the electrical circuit (20) to the external source of electric energy (21).
10. An arrangement according to any one of claims 4-9 characterized in that the electrical circuit (20) comprises a charging unit (22) adapted to charge the SLI battery (6).
11. A vehicle comprising an arrangement for heating a high voltage battery (5) according to any one of claims 4-9.
12. A computer program comprising program code, which program, when the program code is executed in a computer, causes the computer to effect the method according to any one of claims 1-3.
13. A computer program product comprising a data storage medium which can be read by a computer and on which the program code of a computer program according to claim 12 is stored.
PCT/SE2019/050605 2018-07-11 2019-06-25 Method and arrangement for heating a high voltage battery for a vehicle WO2020013745A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE1850887-9 2018-07-11
SE1850887A SE543020C2 (en) 2018-07-11 2018-07-11 Method and arrangement for heating a high voltage battery for a vehicle

Publications (1)

Publication Number Publication Date
WO2020013745A1 true WO2020013745A1 (en) 2020-01-16

Family

ID=69143155

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE2019/050605 WO2020013745A1 (en) 2018-07-11 2019-06-25 Method and arrangement for heating a high voltage battery for a vehicle

Country Status (2)

Country Link
SE (1) SE543020C2 (en)
WO (1) WO2020013745A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022121905A1 (en) * 2020-12-07 2022-06-16 北京车和家信息技术有限公司 Charging and heating control method and apparatus for traction battery, and medium, device and vehicle

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110288704A1 (en) * 2010-05-21 2011-11-24 GM Global Technology Operations LLC Method for heating a high voltage vehicle battery
US20120249284A1 (en) * 2011-03-28 2012-10-04 Continental Automotive Systems, Inc. System for controlling battery conditions
EP2853434A1 (en) * 2013-08-29 2015-04-01 Mitsubishi Jidosha Kogyo Kabushiki Kaisha Electric vehicle charging system
US20150239405A1 (en) * 2014-02-27 2015-08-27 Mitsubishi Jidosha Kogyo Kabushiki Kaisha Vehicle electric battery controlling apparatus
EP3170693A1 (en) * 2015-11-18 2017-05-24 Toyota Jidosha Kabushiki Kaisha Battery system with temperature raising
US20170274783A1 (en) * 2016-03-22 2017-09-28 Toyota Jidosha Kabushiki Kaisha Vehicle

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110288704A1 (en) * 2010-05-21 2011-11-24 GM Global Technology Operations LLC Method for heating a high voltage vehicle battery
US20120249284A1 (en) * 2011-03-28 2012-10-04 Continental Automotive Systems, Inc. System for controlling battery conditions
EP2853434A1 (en) * 2013-08-29 2015-04-01 Mitsubishi Jidosha Kogyo Kabushiki Kaisha Electric vehicle charging system
US20150239405A1 (en) * 2014-02-27 2015-08-27 Mitsubishi Jidosha Kogyo Kabushiki Kaisha Vehicle electric battery controlling apparatus
EP3170693A1 (en) * 2015-11-18 2017-05-24 Toyota Jidosha Kabushiki Kaisha Battery system with temperature raising
US20170274783A1 (en) * 2016-03-22 2017-09-28 Toyota Jidosha Kabushiki Kaisha Vehicle

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022121905A1 (en) * 2020-12-07 2022-06-16 北京车和家信息技术有限公司 Charging and heating control method and apparatus for traction battery, and medium, device and vehicle

Also Published As

Publication number Publication date
SE1850887A1 (en) 2020-01-12
SE543020C2 (en) 2020-09-29

Similar Documents

Publication Publication Date Title
US9919710B2 (en) Power storage system
CN107985229B (en) Battery management system and control method thereof
JP5060026B2 (en) Method and system for controlling vehicle battery temperature
EP2392487B1 (en) Apparatus and method for controlling a relay of a hybrid electric vehicle
US20160298589A1 (en) System and method for improved starting of combustion engine
CN110077278B (en) Discharge management method and system for plug-in hybrid electric vehicle
US20200130535A1 (en) Method for Preheating a Battery of an Electrically Operated Motor Vehicle, and Charging Device
CN104228717A (en) Method and system for distributing a recuperation for a vehicle
EP0784800B1 (en) Motor vehicle battery circuit comprising monitoring of discharge and recharge current
US11005110B2 (en) Energy supply system for a consumer unit and method for supplying energy to a consumer unit
CN105730258A (en) Ignition control system for automobile and automobile
JP6520633B2 (en) Vehicle control system
EP3805035A1 (en) Power battery heating system and method using solar sunroof energy
WO2020013745A1 (en) Method and arrangement for heating a high voltage battery for a vehicle
US8179085B2 (en) Method and apparatus for charging an energy store
CN107492696B (en) Control method and system of high-voltage battery and electric automobile
JP6402687B2 (en) Vehicle battery system
CN112895980B (en) New energy automobile low-temperature charging method and device
US9145057B2 (en) Control method for shortening start time of electric vehicle
JP4696933B2 (en) Defrosting device for vehicles
CN110872967B (en) System and method for providing heat to an exhaust aftertreatment system of a plug-in hybrid electric vehicle
CN111483287A (en) Method and device for controlling recovered energy of HVH (high voltage direct current) of electric vehicle
JP2019108871A (en) External heater operation determination system, and control system for vehicle
JP2019088110A (en) Power supply controller and power supply system
US11764575B2 (en) Low voltage electrical load shedding system

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 19834322

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 19834322

Country of ref document: EP

Kind code of ref document: A1