EP3463967A1 - Electric vehicle battery management apparatus and method - Google Patents
Electric vehicle battery management apparatus and methodInfo
- Publication number
- EP3463967A1 EP3463967A1 EP17728608.5A EP17728608A EP3463967A1 EP 3463967 A1 EP3463967 A1 EP 3463967A1 EP 17728608 A EP17728608 A EP 17728608A EP 3463967 A1 EP3463967 A1 EP 3463967A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- battery
- charge
- state
- replacement
- electric vehicle
- Prior art date
- Legal status (The legal status 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 status listed.)
- Withdrawn
Links
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- 238000007726 management method Methods 0.000 claims abstract description 52
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- 239000013589 supplement Substances 0.000 description 1
Classifications
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- 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
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/72—Electric energy management in electromobility
-
- 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
Definitions
- the present invention relates to a battery management apparatus and method for an electric vehicle.
- the present invention relates to an apparatus and method for managing the state of charge of an onboard battery and/ or a replacement battery.
- Such vehicles include not only passenger vehicles for personal transport, but also commercial vehicles such as buses and trucks.
- electric vehicles include pure battery electric vehicles (BEVs) powered by batteries alone, and range extender electric vehicles (REEVs) which also include a small internal combustion engine (ICE) to generate electricity to supplement the battery power source.
- All such EVs include battery packs for supplying electrical power to the electric drive motor(s).
- Battery packs typically comprise a number of battery cells connected in series.
- multiple battery packs are electrically connected in parallel to provide power to the electric drive motor(s).
- problems can arise when battery packs with different output voltages are connected in parallel, making it difficult to replace individual battery packs.
- connecting batteries with different output voltages in parallel can result in a current surge from one battery to the other.
- a battery management apparatus for an electric vehicle, the electric vehicle comprising an electric drivetrain comprising one or more electric motors, a first battery configured to supply electrical power to the electric drivetrain, and an alternate power source configured to supply electrical power to the first battery and/ or the electric drivetrain, the alternate power source configured to be swappable with a replacement battery
- the battery management apparatus comprising: battery control means for monitoring a state of charge of the first battery, and controlling the state of charge of the first battery and/ or a state of charge of the replacement battery before the replacement battery is installed in the electric vehicle, so that an output voltage of the first battery and an output voltage of the replacement battery are within an acceptable range.
- the battery management apparatus further comprises a power distribution unit configured to control a flow of electrical power between the first battery, the alternate power source and the electric drivetrain , wherein the battery control means is configured to control the power distribution unit to transfer electrical power from the first battery to the electric drivetrain and/ or the alternate power source to decrease the state of charge of the first battery, and to control the power distribution unit to transfer electrical power from the alternate power source to the first battery to increase the state of charge of the first battery.
- the battery control means is configured to predict a state of charge of the first battery at a time when the
- Examples of types of information relating to the planned route that can be obtained include, but are not limited to: a distance to be travelled on the planned route; an expected speed of the electric vehicle during the journey; traffic conditions on the planned route; weather conditions on the planned route; an elevation change over the planned route; and a predicted time required to complete the journey.
- the battery control means is configured to control the replacement battery to be at a predefined state of charge within a range for which the output voltage is substantially constant, at a time when the replacement battery is due to be swapped with the alternate power source.
- the battery control means is configured to monitor the state of charge of the first battery by receiving state of charge information from the first battery, the state of charge information comprising information indicative of the state of charge of the first battery.
- an electric vehicle comprising: an electric drivetrain comprising one or more electric motors ; a first battery configured to supply electrical power to the electric drivetrain ; an alternate power source configured to supply electrical power to the first battery and/ or the electric drivetrain ; and battery management apparatu s according to the first aspect.
- the alternate power source is a removable range extender unit configured to generate electrical power.
- the alternate power source comprises a second battery and the electric vehicle further comprises a regenerative braking system configured to generate electrical power under braking of the electric vehicle, the regenerative braking system being configured to generate electrical power for charging the first battery from a first pair of wheels of the electric vehicle, and to generate electrical power for charging the second battery from a second pair of wheels of the electric vehicle, wherein the battery control means is configured to increase the state of charge of the first battery relative to the state of charge of the second battery by changing a relative amount of electrical power generated from the first and second pairs of wheels by the regenerative braking system so as to supply more electrical power to the first battery than to the second battery, while keeping the total amount of electrical power generated under braking substantially constant.
- a non-volatile computer readable storage medium adapted to store computer program instructions which , when executed, perform a method according to the third aspect.
- Figure 1 schematically illu strates an electric vehicle and battery management apparatus, according to an embodiment of the present invention
- Figure 2 schematically illustrates a battery management apparatus, according to an embodiment of the present invention
- an electric vehicle 100 comprises an electric drivetrain 101, 102 for converting electrical power into mechanical power to drive the electric vehicle 100.
- the electric vehicle 100 further comprises a master battery 103 configured to supply electrical power to the electric drivetrain, and two alternate power sources in the form of a swappable second battery 104 and a range extender unit 105.
- the electric vehicle 100 further comprises a control unit 106 and power distribution unit 107.
- the electric vehicle 100 is provided with separate front 102 and rear 101 electric drivetrains, each of which includes two electric motors.
- each electric motor is arranged to drive one wheel of the electric vehicle 100.
- the front and/ or rear drivetrains may each only include a single electric motor, or may include more than two electric motors.
- the front or rear drivetrain may be omitted, with only the front wheels or the rear wheels being driven.
- the control unit 106 can control the power distribution unit 107 to manage the flow of electrical power between the master battery 103 , the alternate power sources 104, 105, and the electric drivetrain 101, 102.
- the power distribution unit 107 includes an arrangement of electrical switches that can be configured to electrically connect each of the master battery 103, second battery 104, and range extender unit 105 to one or both of the front and rear drivetrains 101, 102. This allows each of the front and rear drivetrains 101, 102 to be driven by one or more of the available power sources 103, 104, 105, in any combination.
- both batteries 103, 104 are electrically connected in parallel.
- the battery management apparatu s may control the state of charge of the second battery 104 so that all three batteries provide substantially the same output voltage.
- the battery management apparatus may manage the states of charge of a plurality of replacement batteries, for example, when both the second battery 104 and the range extender unit 105 are to be replaced by separate replacement batteries.
- the battery management apparatus is schematically illustrated in Fig. 2.
- the memory 201 can be any suitable storage medium, and the processing unit 202 can include one or more processing cores.
- the control unit 106 further comprises a communication unit 203 for communicating wirelessly with the remote charging control unit 111.
- the communication unit 203 may be configured to connect to a mobile telecommunication network so that the control unit 106 and remote charging control unit 111 can communicate over the Internet.
- the control unit 106 is configured to monitor the state of charge of the master battery 103.
- the battery control means is configured to monitor the state of charge of the master battery 103 by receiving state of charge information from a state of charge (SOC) monitoring unit 204 included in the master battery 103.
- the state of charge information comprises information indicative of the state of charge of the master battery 103.
- the master battery 103 includes equipment for measuring the output voltage and/ or current of the first battery, and the SOC monitoring unit 204 is configured to estimate the current state of charge based on the measured voltage and/ or current and a known relationship between the voltage, current, and the state of charge.
- the SOC monitoring unit 204 can then transmit state of charge information indicative of the estimated state of charge to the control unit 106.
- the secondary battery 104 may also include a SOC monitoring unit for transmitting state of charge information of the secondary battery 104 to the control unit 106, allowing the control unit 106 to also monitor the state of charge of the secondary battery 104.
- the battery management apparatus itself may include a voltage and/ or current measuring unit configured to measure the output voltage and/ or current of the master battery 103.
- the control unit 106 could then estimate the state of charge of the master battery 103 from the measured output voltage and/ or current.
- Such embodiments can enable the control unit 106 to monitor the state of charge of the master battery 103 even when the master battery 103 is not capable of reporting state of charge information, for example, if the master battery 103 does not include the necessary hardware or is otherwise unable to report the state of charge due to an internal fault.
- the remote charging control unit 111 of the present embodiment comprises a charging unit 211 which can be controlled to electrically charge or discharge the replacement battery 112.
- active SOC management it is meant that the SOC of a battery is changed by either discharging or charging the battery as required. This process can be referred to as active SOC management. Depending on the embodiment, active SOC management may only be performed at either the electric vehicle 100 or the remote charging station , or may be performed at both locations.
- the onboard control unit 106 may simply communicate the SOC of the master battery 103 to the remote charging unit 111 without performing active SOC management at the electric vehicle. In this case only the remote charging unit 111 performs active SOC management by controlling the SOC of the replacement battery 112 according to the information received from the onboard control unit 106.
- step S303 the step of physically replacing the battery in step S303 may not be performed by the battery management apparatu s, but in practice may be performed by a human operator.
- the onboard control unit 106 controls the power distribution unit 107 to electrically connect the replacement battery 112 in parallel with the master battery 103.
- the replacement battery 112 and the master battery 103 can then supply electrical power to the electric drivetrain in an efficient manner, since power losses are minimised by connecting the batteries in parallel.
- the battery management apparatu s can be further configured to predict a state of charge of the master battery 103 at a time when the replacement battery 112 is due to be swapped with the alternate power source. For example, this may be a fixed time of day, or may be predicted based on the remaining journey time.
- the remote charging control unit 111 can be configured to control the state of charge of the replacement battery 112 to provide substantially the same output voltage as the master battery 103 in the predicted state of charge.
- the onboard control unit 106 is further configured to communicate with a route planning unit 205 in order to obtain information relating to a planned route to be followed by the electric vehicle during a journey.
- the route planning unit 205 can be any suitable device capable of providing information about the planned route, for example, a satellite navigation ('Satnav') unit.
- the obtained route information can be used in predicting the state of charge of the master battery 103 at the end of the journey.
- the information may include, for example, a distance to be travelled on the planned route, the expected speed of the electric vehicle during the journey, traffic conditions on the planned route, weather conditions on the planned route, an elevation change over the planned route, and the predicted time required to complete the journey.
- a graph plotting the output voltage of a battery as a function of the state of charge (SOC) is illustrated, according to an embodiment of the present invention.
- the output voltage remains substantially constant for a range of SOC values.
- the SOC curve includes a central region with a relatively shallow gradient. Within this region, a relatively large change in the SOC of the battery only produces a relatively small change in the output voltage. Outside of this range, the output voltage decreases at low SOC values, and increases at high SOC values.
- the battery management apparatus can be configured to control the SOC of the first battery and/ or the replacement battery to be within a SOC range for which the output voltage is substantially constant.
- This SOC range may be referred to as an acceptable SOC range. It may be possible for two batteries with output voltages within this acceptable SOC range to be safely connected in parallel, provided that the variation in output voltage is sufficiently small within this SOC range.
- the acceptable SOC range can be defined in terms of upper and lower limits that are programmed in advance into the battery control means. In such cases, the onboard control unit 106 and remote charging control unit 111 could independently manage the SOC of the master battery 103 and the replacement battery 112, respectively, without communicating with one another, by controlling the batteries to have SOCs in this range.
- the electric vehicle 100 further comprise a regenerative braking system 108 configured to generate electrical power for charging the master battery 103 and/ or the slave battery 104 under braking of the electric vehicle 100.
- the regenerative braking system 108 is configured to generate electrical power for charging the master battery 103 from one pair of wheels of the electric vehicle 100 , and to generate electrical power for charging the slave battery 104 from the other pair of wheels of the electric vehicle 100.
- the master battery 103 may be charged using power generated from the front wheels and the slave battery 104 may be charged using power generated from the rear wheels, or vice versa.
- embodiments of the invention are not limited to charging individual batteries from a single pair of wheels via regenerative braking, and in some embodiments a given battery may be charged using energy recovered from multiple pairs of wheels, for example when a vehicle comprises more axles than there are batteries.
- control unit 106 may determine that it is necessary to increase the SOC of the master battery 103 relative to the SOC of the second battery 104. For example, this may occur when the SOC of the master battery 103 needs to be increased to ensure that the output voltage matches that of the replacement battery 112, and when the secondary battery 104 does not need to be charged as it is about to be replaced.
- the control unit 106 is configured to control the regenerative braking system 108 to change a relative amount of electrical power generated from the first and second pairs of wheels so as to supply more electrical power to the master battery 103 than to the slave battery 104, while keeping the total amount of electrical power generated under braking substantially constant.
- the regenerative braking system can influence the braking performance of the electric vehicle. By keeping the total amount of electrical power substantially constant, as described above, the control unit 106 can ensure that the vehicle 100 continues to provide consistent braking performance in line with the driver's expectations. If the total output of the regenerative braking system was reduced instead, the braking performance would be altered, potentially causing the driver to lose control of the vehicle.
- the state of charge of both the master battery 103 and the replacement battery 112 are actively controlled by a distributed battery management apparatus.
- the battery management apparatus of the present embodiment includes the onboard control unit 106 in the electric vehicle 100 , and the charging control unit 111 which is situated at a remote charging station , for example, a service depot.
- a remote charging station for example, a service depot.
- the battery management apparatu s may be solely located in the electric vehicle 100 or solely located at the remote charging station , as appropriate.
- the replacement battery 112 may always be charged to a specific predefined output voltage, knowledge of which is pre-programmed into the onboard control unit 106.
- the control unit 106 can then actively manage the state of charge of the master battery 103 so that the output voltage of the master battery 103 matches that of the replacement battery 112 at a time when the replacement battery is due to be installed in the electric vehicle 100.
- the state of charge of the master battery 103 may not be actively managed, but instead may be passively monitored by a SOC monitoring unit 20 1 which reports back to the remote charging control unit 111.
- the remote charging control unit 111 can then discharge or charge the replacement battery 112 as required, in a dynamic fashion , so that the output voltage of the replacement battery 112 matches that of the master battery 103.
- the acceptable range may be defined in terms of an acceptable voltage difference between the output voltage of the master battery 103 and the replacement battery 112, which may be defined in absolute or relative terms.
- an acceptable voltage difference may be defined as 2 V, or as a certain percentage of the output voltage, for example 1%, 2% or 3 %.
- the acceptable range may be defined as a finite range of voltages by setting upper and lower voltage thresholds, and the states of charge of the master battery 103 and the replacement battery 112 can be controlled so that both batteries have output voltages within the range of acceptable voltages.
- the battery management apparatus may cease actively managing the states of charge of the batteries as long as the difference between the output voltages remains within the defined acceptable range. If the difference between the output voltages subsequently becomes larger than the defined acceptable range, the battery management apparatus may resume active management of the state of charge of one or both batteries until the output voltage difference moves back within the acceptable range.
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Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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GB1609680.2A GB2550954B (en) | 2016-06-02 | 2016-06-02 | Electric vehicle battery management apparatus and method |
PCT/GB2017/051564 WO2017207996A1 (en) | 2016-06-02 | 2017-06-01 | Electric vehicle battery management apparatus and method |
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EP3463967A1 true EP3463967A1 (en) | 2019-04-10 |
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EP17728608.5A Withdrawn EP3463967A1 (en) | 2016-06-02 | 2017-06-01 | Electric vehicle battery management apparatus and method |
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GB (1) | GB2550954B (en) |
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CN113246792A (en) * | 2021-07-02 | 2021-08-13 | 上海中科深江电动车辆有限公司 | Range-extending type multifunctional movable battery supplementing mining vehicle device |
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ES2754042B2 (en) * | 2018-10-09 | 2020-08-24 | Rodríguez Daniel Remón | Power control device and procedure for electric vehicles |
CN111137170A (en) * | 2018-11-05 | 2020-05-12 | 重庆峘能电动车科技有限公司 | Power battery pack balancing system, battery replacing system and battery pack |
EP3994023B1 (en) * | 2019-07-04 | 2024-01-17 | Volvo Truck Corporation | A method for controlling electrical connection of battery packs |
CN110231045B (en) * | 2019-08-08 | 2019-11-12 | 宁波洁程汽车科技有限公司 | A kind of intelligence continuation of the journey matching method based on extended-range slag-soil truck |
DE102019129170A1 (en) * | 2019-10-29 | 2021-04-29 | Volkswagen Aktiengesellschaft | Control arrangement for a high-voltage battery and method for operating a control arrangement |
CN111942366B (en) * | 2020-07-27 | 2021-12-21 | 广州汽车集团股份有限公司 | Energy distribution method and system for high-voltage battery of hybrid vehicle |
CN114103727A (en) * | 2020-08-31 | 2022-03-01 | 帝亚一维新能源汽车有限公司 | Replacement detection method for battery pack of power battery system and power battery system |
US11654793B2 (en) | 2020-11-19 | 2023-05-23 | Ford Global Technologies, Llc | Cell capacity based battery pack balancing |
CN112721660B (en) * | 2021-01-26 | 2022-07-19 | 南昌智能新能源汽车研究院 | Energy supply management method and device for double-battery range-extending type electric automobile |
JP2023543090A (en) * | 2021-08-31 | 2023-10-13 | 寧徳時代新能源科技股▲分▼有限公司 | Charging management method for battery exchange station, battery exchange cabinet and system |
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US20120207620A1 (en) * | 2007-07-12 | 2012-08-16 | Odyne Systems, LLC. | Hybrid vehicle drive system and method and idle reduction system and method |
CN103640556A (en) * | 2008-10-15 | 2014-03-19 | 格特拉克·福特传动系统有限公司 | Vehicle having drive train |
US8314587B2 (en) * | 2009-10-09 | 2012-11-20 | Alcatel Lucent | Method and apparatus of stored energy management in battery powered vehicles |
US20110226539A1 (en) * | 2010-03-16 | 2011-09-22 | Huss Michael A | Vehicle with removable auxiliary power system |
DK2372864T3 (en) * | 2010-03-29 | 2017-09-18 | Florian Gardes | Autonomous motorization system |
JP2012113856A (en) * | 2010-11-22 | 2012-06-14 | Toyota Motor Corp | Method of replacing power supply stack, control device, and control program |
US10217160B2 (en) * | 2012-04-22 | 2019-02-26 | Emerging Automotive, Llc | Methods and systems for processing charge availability and route paths for obtaining charge for electric vehicles |
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- 2016-06-02 GB GB1609680.2A patent/GB2550954B/en active Active
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2017
- 2017-06-01 WO PCT/GB2017/051564 patent/WO2017207996A1/en unknown
- 2017-06-01 EP EP17728608.5A patent/EP3463967A1/en not_active Withdrawn
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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CN113246792A (en) * | 2021-07-02 | 2021-08-13 | 上海中科深江电动车辆有限公司 | Range-extending type multifunctional movable battery supplementing mining vehicle device |
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Publication number | Publication date |
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GB2550954A (en) | 2017-12-06 |
GB2550954B (en) | 2022-02-23 |
GB201609680D0 (en) | 2016-07-20 |
WO2017207996A1 (en) | 2017-12-07 |
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