CN114030384B - Battery pack charging control method, battery management system, device and vehicle - Google Patents

Battery pack charging control method, battery management system, device and vehicle Download PDF

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Publication number
CN114030384B
CN114030384B CN202111376617.XA CN202111376617A CN114030384B CN 114030384 B CN114030384 B CN 114030384B CN 202111376617 A CN202111376617 A CN 202111376617A CN 114030384 B CN114030384 B CN 114030384B
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charging
battery pack
current
battery
determining
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CN114030384A (en
Inventor
陈起武
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Guangzhou Xiaopeng Motors Technology Co Ltd
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Guangzhou Xiaopeng Motors Technology Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B60L53/60—Monitoring or controlling charging stations
    • B60L53/62—Monitoring or controlling charging stations in response to charging parameters, e.g. current, voltage or electrical charge
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B60L53/30—Constructional details of charging stations
    • B60L53/31—Charging columns specially adapted for electric 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
    • B60L58/18—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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/10—Technologies relating to charging of electric vehicles
    • Y02T90/12—Electric charging stations

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

Abstract

The application discloses a battery pack charging control method, a battery pack charging control device, a battery management system and a vehicle. The method comprises the following steps: acquiring an open-circuit voltage of a charging pile; determining a target charging mode of the battery pack among preset charging modes based on the open circuit voltage; the preset charging modes comprise a serial charging mode and a parallel charging mode; determining a plurality of reference currents corresponding to the battery packs respectively, wherein the reference currents represent maximum charging currents allowed by the battery packs in a target charging mode; determining a total charge current of the battery pack based on the plurality of reference currents and the target charge mode; the charging total current is requested to the charging post to charge the battery pack. The battery pack in the application can adaptively adjust the target charging mode based on the value of the open-circuit voltage of the charging pile, so that the battery pack can be compatible with charging piles of different charging standards. And further calculating the total charging current in the corresponding target charging mode based on the target charging mode, so that the battery pack can be ensured to be smoothly charged by the charging pile.

Description

Battery pack charging control method, battery management system, device and vehicle
Technical Field
The present disclosure relates to the field of electric vehicles, and more particularly, to a method and an apparatus for controlling charging of a battery pack, a battery management system, and a vehicle.
Background
With the popularization of electric vehicles, the charging problem of the electric vehicles gradually becomes a great difficulty for the owners of the electric vehicles. Because the charging standards of charging piles of electric vehicles in the market are different, the electric vehicles can only be charged by using the charging piles which are matched with the voltages of the battery packs in the vehicles, and great inconvenience is brought to daily charging of the electric vehicles.
Disclosure of Invention
The embodiment of the application provides a battery pack charging control method, a battery management system, a device and a vehicle.
In a first aspect, some embodiments of the present application provide a method for controlling charge of a battery pack including a plurality of battery packs, the method comprising: acquiring an open-circuit voltage of a charging pile, and determining a target charging mode of the battery pack in a preset charging mode based on the open-circuit voltage; the preset charging modes comprise a serial charging mode and a parallel charging mode, wherein the serial charging mode represents that a plurality of battery packs are in a serial state in the charging process, and the parallel charging mode represents that the plurality of battery packs are in a parallel state in the charging process. And further determining a plurality of reference currents corresponding to the battery packs respectively, wherein the reference currents represent the maximum charging current allowed by the battery packs in the target charging mode. Determining a total charge current of the battery pack based on the plurality of reference currents and the target charge mode; and requests a charging total current from the charging post to charge the battery pack.
In a second aspect, some embodiments of the present application further provide a battery management system, including: including a battery pack, a charging circuit, and a controller. The battery pack comprises a plurality of battery packs, and the charging circuit comprises a parallel control module and a serial control module which are respectively connected with the battery pack. The controller is electrically connected with the charging circuit, and further, the controller is configured to: acquiring an open circuit voltage of a charging pile, and determining a target charging mode of the battery pack in a preset charging mode based on the open circuit voltage; the preset charging modes comprise a serial charging mode or a parallel charging mode, wherein the serial charging mode represents that a plurality of battery packs are in a serial state in the charging process, and the parallel charging mode represents that the plurality of battery packs are in a parallel state in the charging process. And determining a plurality of reference currents corresponding to the battery packs respectively, wherein the reference currents represent the maximum charging current allowed by the battery packs in the target charging mode. And determining a total charge current of the battery pack based on the plurality of reference currents and the target charge mode. And if the target charging mode is the parallel charging mode, controlling the parallel control module to be conducted so that the parallel control module and the plurality of battery packs form a parallel charging loop, and requesting the charging pile for the total charging current so as to charge the battery pack. And if the target charging mode is a serial charging mode, controlling the serial control module to be conducted so that the serial control module and the plurality of battery packs form a serial charging loop, and requesting the charging pile for the total charging current so as to charge the battery pack.
In a third aspect, some embodiments of the present application further provide a charge control device of a battery pack, the battery pack including a plurality of battery packs, the device including: the device comprises an open circuit voltage acquisition module, a target charging mode determination module, a reference current determination module, a total charging current determination module and a current request module. The open circuit voltage acquisition module is used for acquiring the open circuit voltage of the charging pile. The target charging mode determining module is used for determining a target charging mode of the battery pack in a preset charging mode based on the open circuit voltage; the preset charging modes comprise a serial charging mode and a parallel charging mode, wherein the serial charging mode represents that a plurality of battery packs are in a serial state in the charging process, and the parallel charging mode represents that the plurality of battery packs are in a parallel state in the charging process. The reference current determining module is used for determining a plurality of reference currents corresponding to the battery packs respectively, wherein the reference currents represent maximum charging currents allowed by the battery packs in a target charging mode. The total charge current determination module is used for determining total charge current of the battery pack based on the plurality of reference currents and the target charge mode. The current request module is used for requesting the charging total current to the charging pile.
In a fourth aspect, some embodiments of the present application further provide a vehicle, including: one or more processors, memory, and one or more applications, wherein the one or more applications are stored in the memory and configured to be executed by the one or more processors, the one or more programs configured to perform the battery pack charge control method described above.
In a fifth aspect, embodiments of the present application further provide a computer readable storage medium storing program code, wherein the program code, when executed by a processor, performs the above-described method of controlling charging of a battery pack.
In a sixth aspect, embodiments of the present application further provide a computer program product, which when executed, implements the above-described method for controlling charging of a battery pack.
The application provides a battery pack charging control method, a battery management system, a device and a vehicle, and a plurality of battery packs are arranged in the battery pack. The method further comprises the step of determining a target charging mode of the battery pack in a preset charging mode based on the value of the open-circuit voltage after the open-circuit voltage of the charging pile is obtained, wherein the preset charging mode comprises a series charging mode and a parallel charging mode. And further determining the total charging current of the battery pack based on the determined target charging mode under the condition that the reference current corresponding to the battery pack is determined. The battery pack in the application can adaptively adjust the target charging mode based on the value of the open-circuit voltage of the charging pile, so that the battery pack can be compatible with charging piles of different charging standards. And further calculating the total charging current in the corresponding target charging mode based on the target charging mode, so that the battery pack can be ensured to be smoothly charged by the charging pile.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 shows an application environment schematic diagram of a method for detecting a heat generation amount of a battery pack according to an embodiment of the present application.
Fig. 2 shows a block diagram of a battery management system according to an embodiment of the present application.
Fig. 3 shows a schematic diagram of a battery pack structure in a parallel charging mode according to an embodiment of the present application.
Fig. 4 shows a schematic diagram of a battery pack structure in a serial charging mode according to an embodiment of the present application.
Fig. 5 shows a connection structure diagram of a charging circuit and a battery pack according to an embodiment of the present application.
Fig. 6 shows a connection structure diagram of another charging circuit and a battery pack according to an embodiment of the present application.
Fig. 7 is a flowchart illustrating a method for controlling charging of a battery pack according to a first embodiment of the present application.
Fig. 8 is a schematic flow chart of a method for controlling charging of a battery pack according to a second embodiment of the present application.
Fig. 9 is a schematic flow chart of a method for controlling charging of a battery pack according to a third embodiment of the present application.
Fig. 10 shows a connection structure diagram of a charging circuit and a battery pack according to an embodiment of the present application.
Fig. 11 shows a block diagram of a battery pack charge control device according to an embodiment of the present application.
Fig. 12 shows a block diagram of a vehicle according to an embodiment of the present application.
Fig. 13 shows a block diagram of a computer readable storage medium according to an embodiment of the present application.
Detailed Description
Embodiments of the present application are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only for the purpose of explaining the present application and are not to be construed as limiting the present application.
In order to better understand the solution of the present application, the following description will make clear and complete descriptions of the technical solution of the embodiment of the present application with reference to the accompanying drawings in the embodiment of the present application. It will be apparent that the described embodiments are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.
The application provides a battery pack charging control method, a battery management system, a device and a vehicle, and a plurality of battery packs are arranged in the battery pack. The method further comprises the step of determining a target charging mode of the battery pack in a preset charging mode based on the value of the open-circuit voltage after the open-circuit voltage of the charging pile is obtained, wherein the preset charging mode comprises a series charging mode and a parallel charging mode. And further determining the total charging current of the battery pack based on the determined target charging mode under the condition that the reference current corresponding to the battery pack is determined. The battery pack in the application can adaptively adjust the target charging mode based on the value of the open-circuit voltage of the charging pile, so that the battery pack can be compatible with charging piles of different charging standards. And further calculating the total charging current in the corresponding target charging mode based on the target charging mode, so that the battery pack can be ensured to be smoothly charged by the charging pile.
For the purpose of facilitating a detailed description of the present application, the application environment in the examples of the present application will be described with reference to the accompanying drawings. Referring to fig. 1, the method for detecting the heat generation amount of the battery pack provided in the example of the present application may be applied to a vehicle 100, and the vehicle 100 may include a vehicle body 10 and a battery management system (Battery Management System, BMS) 20.
The vehicle 100 is a vehicle 100 that runs on wheels driven by a motor using a battery pack (on-vehicle power supply), and includes, but is not limited to, a car, a bus, and the like.
The battery management system (Battery Management System, BMS) 20 is used for intelligently managing and maintaining each battery cell, preventing the battery from being overcharged and overdischarged, prolonging the service life of the battery, and monitoring the state of the battery. Referring to fig. 2, a block diagram of a battery management system 20 according to an embodiment of the present application is shown. In the present embodiment, the battery management system 20 includes a battery pack 210, a charging circuit 220, and a controller 230. The charging circuit 220 includes a parallel control module 2201 and a serial control module 2203 respectively connected to the battery packs 210.
The battery pack 210 supplies electric power to a driving motor of the vehicle 100, which converts the electric power of the battery pack 210 into mechanical energy. The battery pack 210 may include one or more battery cells and a protective plate, and common battery packs 210 include a sodium-sulfur battery pack 210, a nickel-cadmium battery pack 210, a lithium battery pack 210, a fuel cell pack 210, and the like. In the embodiment of the present application, the battery pack 210 includes a plurality of battery packs 2101, and the plurality of battery packs 2101 form the battery pack 210 by being connected in series or in parallel with each other. When the plurality of battery packs 2101 are in a series state during charging, this indicates that the battery pack 210 is in a series charging mode; when the plurality of battery packs 2101 are in a parallel state during charging, this indicates that the battery pack 210 is in a parallel charging mode. The battery pack 2101 includes a plurality of battery cells 2103, and the plurality of battery cells 2103 form the battery pack 2101 in a manner of being connected in series or in parallel with each other. Referring to fig. 3 and fig. 4, fig. 3 is a schematic structural diagram of a battery pack 210 in a parallel charging mode according to an embodiment of the present application, and fig. 4 is a schematic structural diagram of a battery pack 210 in a serial charging mode according to an embodiment of the present application. In fig. 3 and 4, the battery pack 210 includes two battery packs 2101, and the battery packs 2101 include a plurality of cells 2103 connected in series in sequence.
The controller 230 is electrically connected to the charging circuit 220, and the controller 230 is configured to: an open circuit voltage of the charging stake is obtained and a target charging mode of the battery pack 210 is determined among preset charging modes based on the open circuit voltage. The preset charging modes include a series charging mode or a parallel charging mode, the series charging mode representing that the plurality of battery packs 2101 are in a series state during charging, and the parallel charging mode representing that the plurality of battery packs 2101 are in a parallel state during charging. Further, a plurality of reference currents corresponding to the plurality of battery packs 2101, respectively, are determined, the reference currents characterizing a maximum charging current allowed by the battery packs 2101 in the target charging mode. Based on the plurality of reference currents and the target charging mode, a total charge current of the battery pack 210 is determined. If the target charging mode is the parallel charging mode, the parallel control module 2201 is controlled to be turned on to enable the parallel control module 2201 and the plurality of battery packs 2101 to form a parallel charging loop, and the charging pile is requested to charge the battery pack 210 with the total charging current. If the target charging mode is the serial charging mode, the serial control module 2203 is controlled to be turned on to enable the serial control module 2203 and the plurality of battery packs 2101 to form a serial charging loop, and the charging pile is requested to charge the battery pack 210 with the total charging current.
In some embodiments, the charging circuit 220 further includes a plurality of current sensors 2205, the plurality of current sensors 2205 being connected in series with the plurality of battery packs 2101 in a one-to-one correspondence to form a plurality of charging branches 240. Referring to fig. 5, fig. 5 shows a connection structure of a charging circuit and a battery pack composed of two battery packs 2101. The two current sensors 2205 and the two battery packs 2101 are connected in series in a one-to-one correspondence to form a first charging leg 2401 and a second charging leg 2403. Specifically, the current sensor 2205 may be a current transformer, a hall current sensor, a fluxgate current sensor, or the like. The first charging leg 2401 and the second charging leg 2403 have an output and an input, respectively. The parallel control module 2201 includes two parallel control units 2202. Two ends of one parallel control unit 2202 are respectively connected to the output ends of the adjacent first charging branch 2401 and second charging branch 2403, and two ends of the other parallel control unit 2202 are respectively connected to the input ends of the first charging branch 2401 and the second charging branch 2403. The serial control module 2203 includes a serial control unit 2204, and two ends of the serial control unit 2204 are respectively connected to the output end of the first charging branch 2401 and the input end of the second charging branch 2403. Further, the connection node of the serial control unit 2204 and the input terminal of the second charging branch 2403 is located: the second charging branch 2403 and the parallel control unit 2202 are between the connection nodes of the inputs of the second charging branch 2403. The connection node of the serial control unit 2204 to the output of the first charging branch 2401 is located: the first charging branch 2401 and the parallel control unit 2202 are between the connection nodes of the outputs of the first charging branch 2401. Referring to fig. 5 again, in some embodiments, the charging circuit 220 further includes a conduction control module 2207, the conduction control module 2207 includes two conduction control units 2208, and the two conduction control units 2208 are respectively connected to an input terminal and an output terminal of the battery pack 210.
Specifically, the parallel control unit 2202, the series control unit 2204, and the on control unit 2208 are components having a function of turning on and off a circuit branch, or a circuit constituted by a plurality of components. For example, the components having the function of turning on and off the circuit branch may be a thyristor, a Power transistor (GTR), a gate turn-off thyristor (GTO), a Power field effect transistor (Power MOSFET), an Insulated Gate Bipolar Transistor (IGBT), and the like. Specifically, when the two parallel control units 2202 are in the closed state and the serial control unit 2204 is in the open state, the two charging branches 240 are connected in parallel; when the two parallel control units 2202 are in an open state and the series control unit 2204 is in a closed state, the two charging branches 240 are connected in series.
Referring to fig. 6, a connection structure diagram of another charging circuit and a battery pack according to an embodiment of the present application is shown. In fig. 6, the battery pack 210 is formed of at least two battery packs 2101, and the specific structure between the charging circuit and the battery pack can refer to the structure in fig. 5, and will not be described in detail herein.
The battery management system 20 is not limited to the one provided in the vehicle 100, and the battery management system 20 may be provided in any electronic device or mechanical device provided with the battery pack 210 having the above-described structure.
Referring to fig. 7, fig. 7 shows a method for controlling charging of a battery pack according to a first embodiment of the present application, where the battery pack includes a plurality of battery packs. The method comprises the steps of selecting a target charging mode of the battery pack based on the open-circuit voltage of the charging pile, further calculating a reference current corresponding to the battery pack, further determining the total charging current of the battery pack based on the reference current and the target charging mode, and finally requesting the total charging current from the charging pile. Specifically, the method may include steps S710 to S750.
Step S710: and obtaining the open circuit voltage of the charging pile.
The open circuit voltage of the charging pile represents the maximum value of the output voltage of the charging output circuit of the charging pile in the open circuit state. In the event that the vehicle and the charging device (e.g., a charging gun) of the charging post are connected, a battery management system in the vehicle detects the open circuit voltage of the charging post. As an implementation mode, after the vehicle and the charging device corresponding to the charging pile are connected, the vehicle enters an insulation detection stage of the charging pile, and in the insulation detection stage, the battery management system acquires the open-circuit voltage of the charging pile from the message information by receiving the message information sent by the charging pile.
Step S720: the target charging mode of the battery pack is determined among preset charging modes based on the open circuit voltage.
The preset charging modes include a serial charging mode and a parallel charging mode, the serial charging mode represents that a plurality of battery packs are in a serial state in the charging process, the parallel charging mode represents that a plurality of battery packs are in a parallel state in the charging process, and schematic diagrams of the parallel charging mode and the serial charging mode can be specifically referred to fig. 2 and 3, and are not described in detail herein.
As one embodiment, the target charging mode of the battery pack may be determined by judging a magnitude relation between the open circuit voltage and a preset voltage threshold. The preset voltage threshold represents the maximum total charging voltage of the battery pack in the series charging mode. Taking the structure of the battery pack in the series charging mode as an example, as shown in fig. 3, in the battery pack, a plurality of battery cells are connected in series to each other to form a battery pack, and two battery packs are connected in series to form the battery pack. Therefore, the maximum total charging voltage of the battery pack is the sum of the maximum total charging voltages of each battery cell in the battery pack, and the maximum total charging voltage of each battery cell can be obtained by searching the corresponding usage manual of the battery cell. For example, if the battery pack is formed by 200 battery cells with the same model, and the maximum total charging voltage corresponding to the battery cells with the same model is 4.3V, the maximum total charging voltage of the battery pack in the series charging mode is 860V, that is, the preset voltage threshold is 860V. Further, step S720 may include step S721 and step S723.
In step S721, if the open circuit voltage is greater than or equal to the preset voltage threshold, the target charging mode is determined to be the series charging mode.
If the open-circuit voltage of the charging pile is greater than or equal to the preset voltage threshold, the battery pack can be charged in the series charging mode, and the total charging voltage of the battery pack can be further determined to be the preset voltage threshold, namely the maximum total charging voltage of the battery pack in the series charging mode. For example, if the open circuit voltage of the current charging pile is 900V and the preset voltage threshold is 860V, the target charging mode is determined to be the series charging mode, and further it may be determined that the total charging voltage of the battery pack is 860V, that is, in the subsequent charging process, the battery management system sends a charging request with the total charging voltage of 860V to the charging pile.
Step S723 is to determine that the target charging mode is the parallel charging mode if the open circuit voltage is less than the preset voltage threshold.
If the open-circuit voltage of the charging pile is smaller than the preset voltage threshold, the open-circuit voltage of the charging pile is indicated to be incapable of meeting the requirement of the total charging voltage of the battery pack in the series charging mode, and the target charging mode is determined to be the parallel charging mode. For example, if the open circuit voltage of the current charging pile is 600V and the preset voltage threshold is 860V, the target charging mode is determined to be the parallel charging mode, and a method for determining the total charging voltage of the battery pack in the parallel charging mode is further provided. Taking the structure of the battery pack in the parallel charging mode as an example, in the battery pack shown in fig. 2, a plurality of battery cells are connected in series to each other to form a battery pack, and two battery packs are connected in parallel to form the battery pack. Firstly, calculating the maximum charging total voltage corresponding to each battery pack, wherein the maximum charging total voltage corresponding to the battery pack is the sum of the maximum charging total voltages of the battery cells in the battery pack because the battery cells in the battery pack are connected in series. For example, if the first battery pack is formed by connecting 100 battery cells with the same model in series, the maximum total charging voltage corresponding to the battery cells with the same model is 4.3V, and then the maximum total charging voltage corresponding to the first battery pack is 430V; if the second battery pack is formed by connecting 120 battery cells with the same model in series, the maximum total charging voltage corresponding to the battery cells with the same model is 4.3V, and the maximum total charging voltage corresponding to the second battery pack is 516V. Next, the minimum value of the maximum total charge voltages corresponding to the plurality of battery packs is determined as the total charge voltage of the battery pack in the parallel charge mode, specifically, the total charge voltage corresponding to the battery pack in the parallel charge mode in the above example is 430. In the subsequent charging process, the battery management system transmits a charging request for charging the charging pile with a total voltage of 430V.
In this case, the number of cells connected in series in the battery pack may be reduced, and the battery pack may be further switched into a state in which a plurality of sub-battery packs are connected in parallel, if the open circuit voltage of the charging stake is smaller than the total charge voltage corresponding to the battery pack in the parallel charge mode. Specifically, if the first battery pack is formed by connecting 100 battery cells with the same model in series, the first battery pack can be further switched into a state that two sub-battery packs are connected in parallel. The sub-battery pack is formed by connecting 50 battery cells with the same model in series, so that the corresponding total charging voltage of the battery pack in a parallel charging mode is reduced, and the charging pile can smoothly charge the battery pack.
In this embodiment, the target charging mode of the battery pack corresponding to the open-circuit voltage is determined by setting the preset voltage threshold, so that the battery pack can adjust the target charging mode in a targeted manner, thereby ensuring the safety of the battery pack in the charging process.
Step S730: and determining a plurality of reference currents corresponding to the battery packs respectively.
The reference current characterizes a maximum charge current allowed by the battery pack in the target charge mode. The battery pack comprises a plurality of battery cells, and a plurality of reference currents corresponding to the battery packs can be determined by sequentially determining the reference currents corresponding to the battery packs. In this embodiment, the reference current corresponding to the corresponding battery pack may be determined by determining a plurality of cell reference currents corresponding to a plurality of cells in the battery pack, respectively. Specifically, a specific calculation manner of the reference current corresponding to the single battery pack is described in the following examples.
Step S740: based on the plurality of reference currents and the target charging mode, a total charging current of the battery pack is determined.
In this embodiment, first, a first target reference current is determined based on a plurality of reference currents, the first target reference current characterizing a minimum value of the plurality of reference currents.
Illustratively, the battery pack includes three battery packs, and the reference currents corresponding to the three battery packs are 4A, 4.2A and 3.9A, respectively, and the first target reference current corresponding to the battery pack is 3.9A.
Further, a total charge current of the battery pack is determined based on the first target reference current and the target charge mode. Specifically, if the target charging mode is the parallel charging mode, the number of parallel battery packs is obtained, and the product of the first target reference current and the number is determined as the total charging current of the battery pack. If the target charging mode is a series charging mode, the first target reference current is determined as the total charging current of the battery pack.
For example, if the target charging mode is the parallel charging mode, the number of parallel battery packs is obtained by the battery management system, and if the first target reference current corresponding to the battery pack is 3.9A and the number of parallel battery packs is 3, the total charging current of the battery pack is 11.7A in this case. If the target charging mode is the series charging mode and the first target reference current corresponding to the battery pack is 3.9A, the total charging current of the battery pack is 3.9A in this case.
In this embodiment, a method for determining a total charging current of a battery pack based on a first target reference current and a target charging mode is provided, which is helpful for the battery pack to be able to adaptively adjust the total charging current according to different target charging modes.
Step S750: the charging total current is requested to the charging post to charge the battery pack.
In the case of determining the total current charged by the battery pack, the battery management system transmits request information to the charging pile, and the request information includes the total current charged information. Alternatively, the request information may further include information of the total charge voltage of the battery pack, and the determination process of the total charge voltage of the battery pack is described in detail with reference to step S720.
The application provides a charging control method of a battery pack. The method further comprises the step of determining a target charging mode of the battery pack in a preset charging mode based on the value of the open-circuit voltage after the open-circuit voltage of the charging pile is obtained, wherein the preset charging mode comprises a series charging mode and a parallel charging mode. And further determining a total charge current of the battery pack based on the determined target charge mode in the case that the reference current corresponding to each battery pack is determined. The battery pack in the application can adaptively adjust the target charging mode based on the value of the open-circuit voltage of the charging pile, so that the battery pack can be compatible with charging piles of different charging standards. And further calculating the total charging current in the corresponding target charging mode based on the target charging mode, so that the battery pack can be ensured to be smoothly charged by the charging pile.
Referring to fig. 8, fig. 8 shows a method for controlling charging of a battery pack according to a second embodiment of the present application, where the battery pack includes a plurality of battery packs, and the plurality of battery packs are in a parallel charging mode during charging. After the battery pack is charged for a preset period of time, the actual charging currents corresponding to the battery packs are further obtained, if the actual charging currents of the battery packs are larger than the reference current, the fact that the battery table is overcharged is indicated, and the total charging current is corrected based on the overcharged current. By the method, the phenomenon that the heating value of the battery pack is increased due to current overcharging can be reduced, and further the problem that the battery pack is not out of control due to current overcharging is solved. Specifically, the method may include steps S810 to S855.
Step S810: and obtaining the open circuit voltage of the charging pile.
Step S815: based on the open circuit voltage, a target charging mode of the battery pack is determined to be a parallel charging mode.
The specific embodiments of step S810 to step S815 can be described in detail with reference to step S710 to step S720, and will not be described in detail herein.
Step S820: and determining a plurality of reference currents corresponding to the battery packs respectively.
And determining the reference current corresponding to each battery pack in sequence, so that a plurality of reference currents corresponding to a plurality of battery packs respectively can be determined. Specifically, the reference current corresponding to each battery pack can be determined through steps a01 to a 05.
Step A01: and determining the working temperature and the working voltage respectively corresponding to the multiple electric cores in the battery pack.
The operating temperature characterizes the temperature value of the cell when temperature detection is performed. In the battery pack provided by the application, a plurality of temperature sensors are arranged to detect the working temperature value of the battery cell. The temperature sensor and the battery cell can be in one-to-one correspondence, namely, the temperature value detected by the temperature sensor is the working temperature value of the battery cell corresponding to the temperature sensor; the temperature sensor and the battery cells can be in one-to-many relation, namely, the temperature value detected by one temperature sensor is the working temperature value of a plurality of battery cells of the temperature sensor within a certain distance range, and the corresponding working temperatures of the battery cells can be determined by reading the temperature values in the temperature sensor through the battery management system. Specifically, the temperature sensor may be a platinum-hot resistance temperature sensor, a thermocouple temperature sensor, a thermistor temperature sensor, or the like.
The operating voltage characterizes the voltage value of the battery cell when voltage detection is performed. Further, a plurality of voltage sensors are provided in the battery pack to detect the operating voltage values of the battery cells. The voltage sensors and the battery cells are in one-to-one correspondence, namely, the voltage value detected by the voltage sensors is the working voltage value of the battery cells corresponding to the voltage sensors. And the battery management system reads the voltage value in the voltage sensor to determine the working voltages corresponding to the multiple battery cells. Specifically, the voltage sensor may be a hall voltage sensor, an optical fiber voltage sensor, or the like.
Step A03: based on a preset current model, determining a plurality of battery cell reference currents corresponding to the battery cells respectively according to the working temperature and the working voltage.
The current model is used for representing a three-dimensional model of the corresponding relation among the working temperature, the working voltage and the reference current of the battery cell. The three-dimensional model may be a mapping table of the corresponding relationship among the working temperature, the working voltage and the reference current of the battery cells, and the battery management system may determine the current corresponding reference current values of the battery cells by querying the mapping table when determining the current working temperature and the current working voltage of the battery cells. The mapping table may be stored in the battery management system in advance, or may be stored in a cloud server that establishes a communication connection with the vehicle.
Step A05: a reference current of the battery pack is determined based on the plurality of cell reference currents.
As an embodiment, if a plurality of cells are connected in series to form a battery pack, the reference current of the battery pack is the minimum value of the plurality of cell reference currents corresponding to the plurality of cells in the battery pack. For example, if the battery pack is formed by connecting three battery cells in series, the reference currents of the battery cells corresponding to the three battery cells are respectively 4A, 4.2A and 3.9A, and then the reference current of the battery pack is 3.9A. If the plurality of battery cells are connected in parallel to form a battery pack, the reference current of the battery pack is the product of the minimum value of the plurality of battery cell reference currents corresponding to the plurality of battery cells in the battery pack and the number of the battery cells. For example, if the battery pack is formed by connecting three battery cells in parallel, and the reference currents of the battery cells corresponding to the three battery cells are respectively 4A, 4.2A and 3.9A, the reference current of the battery pack is 11.7A.
Further, repeating the steps a01 to a05 to obtain a plurality of reference currents corresponding to the plurality of battery packs respectively.
In this embodiment, a method for determining a reference current corresponding to a battery pack is provided, which is helpful for further determining a total charging current of a battery pack in different target charging modes based on a plurality of reference currents corresponding to a plurality of battery packs in a subsequent step.
Step S825: based on the plurality of reference currents and the parallel charging mode, a total charge current of the battery pack is determined.
Step S830: the charging total current is requested to the charging post to charge the battery pack.
The specific embodiments of step S825 to step S830 may refer to the detailed descriptions of step S740 to step S750, and are not described in detail herein.
Step S835: and after the battery pack is charged for a preset time period based on the total charging current, acquiring a plurality of actual charging currents corresponding to the battery packs respectively.
After the battery pack is charged for a certain time, the battery packs are in different charging states in the charging process due to the inconsistency of the battery cells, so that the corresponding actual charging current value of part of the battery packs is larger than the reference current value (namely the maximum safe current value) of the battery packs. In this case, the heat generation amount of the battery pack increases, and in severe cases, a thermal runaway failure of the battery pack occurs. Therefore, it is necessary to detect the actual charge current value of the battery pack after a preset period of time. The preset duration can be set by default in the battery management system, and can be dynamically adjusted by a researcher based on the test condition of the battery pack. As an embodiment, as shown in fig. 4, a corresponding current sensor is connected in series to a branch corresponding to a battery pack, and the battery management system can obtain a plurality of actual charging currents corresponding to a plurality of battery packs respectively by reading current values of the current sensors.
Step S840: if the actual charging current corresponding to at least one battery pack is larger than the reference current corresponding to the battery pack, determining at least one battery pack as an abnormal battery pack, and determining the rest battery packs as non-abnormal battery packs.
The method for obtaining the reference current corresponding to the battery pack is described with reference to step S730. For example, if the reference current corresponding to the battery pack is 4A and the actual charging current value read by the current sensor is 4.3A, the battery pack is determined to be an abnormal battery pack; if the actual charging current value read by the current sensor is 3.8A, the battery pack is determined to be a non-abnormal battery pack.
Step S845: and determining the current overcharge of the abnormal battery pack.
The current-over-charge is the difference between the actual charge current of the abnormal battery pack and the reference current corresponding to the abnormal battery pack. For example, if the reference current corresponding to the battery pack is 4A and the actual charging current value read by the current sensor is 4.3A, the battery pack is an abnormal battery pack, and the current overcharge corresponding to the abnormal battery pack is 4.3A-4 a=0.3A.
Step S850: based on the current over-charge, a corrected total charge current is obtained.
The corrected charge total current is determined based on the current flow recharge. In some embodiments, the difference between the present total charge current and the current overcharge is calculated to determine a corrected total charge current. In other embodiments, the ratio between the current-through-charge and the present total charge current is calculated and the present total charge current is corrected based on the ratio. In still other embodiments, the reference current of the abnormal battery pack is adjusted based on the current over-charge, thereby determining a corrected total charge current. As an embodiment, step S850 may include steps S8501 to S8505.
Step S8501: based on the current flow recharge, a correction current for the abnormal battery pack is determined.
The correction current is the difference between the reference current corresponding to the abnormal battery pack and the current overcharge value. For example, if the reference current corresponding to the battery pack is 4A and the actual charging current value read by the current sensor is 4.3A, the battery pack is an abnormal battery pack, and the current overcharge corresponding to the abnormal battery pack is 0.3A. It is further possible to calculate the correction current of the abnormal battery pack, which is 3.7A in this example.
Step S8503: a second target reference current is determined based on the corrected current of the abnormal battery pack and the reference current corresponding to the non-abnormal battery pack.
The second target reference current is the minimum value of the correction current and the reference current corresponding to the non-abnormal battery pack. Illustratively, the number of abnormal battery packs is 1, and the corresponding correction current is 3.7A; the number of non-abnormal battery packs was 2, and the corresponding reference currents were 4A and 4.2A, respectively. At this time, the second target reference current is 3.7A.
Step S8505: the product of the second target reference current and the number of parallel battery packs is determined as the corrected total charge current.
For example, if the second target reference current is 3.7A and the number of parallel battery packs is 3, the corresponding corrected total charge current is 11.1A.
In the embodiment of the application, a calculation method corresponding to correction current of an abnormal battery pack is provided, specifically, current overcharge of the abnormal battery pack is calculated, and the current overcharge is further subtracted on the basis of a reference current value corresponding to the abnormal battery pack, so that in a subsequent charging process, when the battery pack is overcharged again, actual charging current is smaller than the reference current, and safety of the battery pack charging process is guaranteed.
Step S855: the correction of the total charging current is requested to the charging pile.
The specific embodiment of step S855 may refer to the detailed description of step S750, and will not be described in detail herein.
In the embodiment of the application, the method for detecting whether the battery pack has the current overcharge problem in the parallel charging mode is provided, the current overcharge problem caused by the inconsistency problem of the battery cells in the battery pack in each charging branch is solved, the probability of thermal runaway of the battery pack caused by the current overcharge is reduced, and the charging safety of the battery pack is ensured.
Referring to fig. 9, fig. 9 shows a method for controlling charging of a battery pack according to a third embodiment of the present application, where the battery pack includes a plurality of battery packs, and the plurality of battery packs are in a parallel charging mode during charging. After the set duration of the charging process of the battery pack is set, the actual states of charge corresponding to the plurality of battery packs are further obtained, and if the actual states of charge of the battery packs represent the battery packs and are in a charging completion state, the charging branch where the battery packs are located is cut off. By the method, the battery pack in the charged state is disconnected in time, so that the problem that the battery pack cannot be out of control due to over-charging of current is solved. Specifically, the method may include steps S910 to S945.
Step S910: and obtaining the open circuit voltage of the charging pile.
Step S915: based on the open circuit voltage, a target charging mode of the battery pack is determined to be a parallel charging mode.
Step S920: and determining a plurality of reference currents corresponding to the battery packs respectively.
Step S925: based on the plurality of reference currents and the parallel charging mode, a total charge current of the battery pack is determined.
Step S930: the charging total current is requested to the charging post to charge the battery pack.
The specific embodiments of step S910 to step S930 may refer to the detailed descriptions of step S710 to step S750, and will not be described in detail herein.
Step S935: and after the set time period for charging the battery pack based on the total charging current, acquiring a plurality of actual charge states corresponding to the battery packs respectively.
After the battery pack is charged for a certain time, the battery packs are in different charging states in the charging process due to the inconsistency of the battery cells, so that the battery cells corresponding to part of the battery packs are in full charge states. In this case, if the battery pack is continuously charged, the battery cell overcharge problem occurs, which causes an increase in the amount of heat generated by the corresponding battery pack, and in severe cases, a thermal runaway failure of the battery pack occurs. Therefore, it is necessary to detect the actual state of charge of the battery pack after a set period of time. The setting time length can be set by default in the battery management system, and can be dynamically adjusted by a researcher based on the test condition of the battery pack.
As an embodiment, the actual state of charge corresponding to the corresponding battery pack may be determined by the states of charge of the plurality of cells in the battery pack. In particular, the actual state of charge of a battery pack may be characterized as the ratio between the number of cells in the battery pack that are in a full state of charge and the total number of cells in the battery pack. Illustratively, if the number of cells in the battery pack in a full charge state is 80 and the total number of cells in the battery pack is 100, the actual state of charge of the battery pack is 80%.
Further, by detecting the operating voltages of the plurality of battery cells in the battery pack to determine the corresponding battery cell state of charge, a specific embodiment of the detection manner corresponding to the operating voltage may be described in detail in step a 01. And then, based on a preset state-of-charge model, determining a plurality of actual cell state-of-charge values corresponding to the plurality of cells respectively according to the working voltage. Wherein the state of charge model characterizes a two-dimensional model between the operating voltage of the cell and the state of charge of the cell. The two-dimensional model may be a mapping table of the corresponding relationship between the working voltages and the states of charge of the battery cells, and the battery management system may determine the state of charge values of the battery cells corresponding to the current battery cells by querying the mapping table when determining the current working voltages of the battery cells. The mapping table may be stored in the battery management system in advance, or may be stored in a cloud server that establishes a communication connection with the vehicle.
Step S940: if the actual state of charge corresponding to the battery pack meets the state of charge preset condition, the charging branch where the battery pack is located is cut off.
The state of charge preset condition is used for representing that the corresponding battery pack is in a charge completion state. As an embodiment, the charging branch where the battery pack is located is cut off when the actual state of charge corresponding to the battery pack is greater than a preset value. Specifically, the preset value may be any ratio of greater than or equal to 90% and less than or equal to 100%, taking the preset value of 95% as an example, if the actual state of charge corresponding to the battery pack is greater than 95%, it is indicated that more than 95% of the battery cells in the battery pack are in a full state of charge, and at this time, the charging branch where the battery pack is located is cut off.
Referring to fig. 10, a branch control unit 2209 is connected in series to each charging branch in fig. 10. The branch control unit 2209 is a component having a function of turning on and off a circuit branch or a circuit constituted by a plurality of components. For example, the components having the function of turning on and off the circuit branch may be a thyristor, a Power transistor (GTR), a gate turn-off thyristor (GTO), a Power field effect transistor (Power MOSFET), an Insulated Gate Bipolar Transistor (IGBT), and the like. In the normal charging process, the branch control units 2209 are all in a closed state, and if the actual state of charge corresponding to the battery pack meets the state of charge preset condition, the battery control system controls the branch control units 2209 corresponding to the battery pack to be in an open state.
Step S945: the total charge current of the battery pack is re-determined.
The number of charging branches of the branch control unit in the closed state is detected by the battery management system, and the reference current of the battery pack on the corresponding charging branch is further obtained, and the reference current obtaining manner may be described in detail in step S730. And further determining a first reference current from the plurality of reference currents, multiplying the first reference current by the number of charging branches in a closed state of the branch control unit, and re-determining the product result as the total charging current of the battery pack. Specific embodiments of the first reference current may be described in detail with reference to step S740. For example, if the first reference current is 4A and the number of charging branches in which the branch control unit is in the closed state is 2, the total charging current of the battery pack is re-determined to be 8A.
Step S950: and requesting the re-determined charging total current from the charging pile.
The specific embodiment of step S950 may refer to the detailed description of step S750, and will not be described in detail herein.
In the embodiment of the application, the actual state of charge of the battery pack is detected after the set time length, so that the charging branch where the battery pack is located is cut off under the condition that the actual state of charge of the battery pack meets the state of charge preset condition, the battery pack can be stopped in time under the full state of charge, the probability of thermal runaway of the battery pack caused by overcharging of the battery cell is reduced, and the charging safety of the battery pack is ensured.
Referring to fig. 11, a charging control device 1100 of a battery pack according to an embodiment of the present application is shown, the battery pack includes a plurality of battery packs, and the device 1100 includes: an open circuit voltage acquisition module 1110, a target charging mode determination module 1120, a reference current determination module 1130, a total charge current determination module 1140, and a current request module 1150. The open circuit voltage acquisition module 1110 is configured to acquire an open circuit voltage of the charging pile. The target charging mode determining module 1120 is configured to determine a target charging mode of the battery pack in a preset charging mode based on the open circuit voltage; the preset charging modes comprise a serial charging mode and a parallel charging mode, wherein the serial charging mode represents that a plurality of battery packs are in a serial state in the charging process, and the parallel charging mode represents that the plurality of battery packs are in a parallel state in the charging process. The reference current determining module 1130 is configured to determine a plurality of reference currents corresponding to the plurality of battery packs, respectively, where the reference currents characterize a maximum charging current allowed by the battery packs in the target charging mode. The total charge current determination module 1140 is configured to determine a total charge current of the battery pack based on the plurality of reference currents and the target charging mode. The current request module 1150 is used for requesting the charging total current from the charging post to charge the battery pack.
In some embodiments, the battery pack includes a plurality of battery cells, and the reference current determination module 1130 is configured to determine an operating temperature and an operating voltage of each of the plurality of battery cells in the battery pack. And further determining a plurality of battery cell reference currents corresponding to the battery cells according to the working temperature and the working voltage based on a preset current model, wherein the current model is used for representing a three-dimensional model of the corresponding relation among the working temperature, the working voltage and the battery cell reference currents of the battery cells. Finally, a reference current of the battery pack is determined based on the plurality of cell reference currents. And obtaining a plurality of reference currents corresponding to the battery packs respectively according to the steps A01, A03 and A05.
In some embodiments, the charge total current determination module 1140 is configured to determine a first target reference current based on a plurality of reference currents, the first target reference current characterizing a minimum value of the plurality of reference currents. If the target charging mode is a parallel charging mode, the number of the parallel battery packs is obtained, and the product of the first target reference current and the number is determined as the total charging current of the battery pack; if the target charging mode is a series charging mode, the first target reference current is determined as the total charging current of the battery pack.
In some embodiments, the target charging mode determining module 1120 is configured to determine that the target charging mode is a serial charging mode if the open circuit voltage is greater than or equal to a preset voltage threshold, where the preset voltage threshold characterizes a maximum total charging voltage of the battery pack in the serial charging mode; and if the open-circuit voltage is smaller than the preset voltage threshold value, determining that the target charging mode is a parallel charging mode.
In some embodiments, the target charging mode is a parallel charging mode, the apparatus 1100 further comprising: an actual charging current acquisition module (not shown in the figure), an abnormal battery pack determination module (not shown in the figure), a current overcharge determination module (not shown in the figure), and a corrected charging total current determination module (not shown in the figure). The actual charging current obtaining module (not shown in the figure) is configured to obtain a plurality of actual charging currents corresponding to the plurality of battery packs respectively after a preset duration of charging the battery pack based on the total charging current. The abnormal battery pack determining module (not shown in the figure) is configured to determine at least one battery pack as an abnormal battery pack if there is at least one battery pack corresponding to an actual charging current greater than a reference current corresponding to the battery pack, and determine the remaining battery packs as non-abnormal battery packs. The current overcharge determination module (not shown in the figure) is configured to determine a current overcharge of the abnormal battery pack, where the current overcharge is a difference between an actual charging current of the abnormal battery pack and a reference current corresponding to the abnormal battery pack. The corrected charging total current determination module (not shown in the figure) is configured to obtain a corrected charging total current based on the current flowing through the recharging. The current request module 1150 is used for requesting correction of the total charging current from the charging pile.
In some embodiments, a correction charging total current determining module (not shown in the figure) is configured to determine a correction current of the abnormal battery pack based on the current flowing through the charging, where the correction current is a difference between a reference current corresponding to the abnormal battery pack and the current overcharge. And determining a second target reference current based on the correction current of the abnormal battery pack and the reference current corresponding to the non-abnormal battery pack, wherein the second target reference current is the minimum value of the correction current and the reference current corresponding to the non-abnormal battery pack. The product of the second target reference current and the number of parallel battery packs is determined as the corrected total charge current.
It will be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working process of the apparatus and modules described above may refer to the corresponding process in the foregoing method embodiment, which is not repeated herein.
In several embodiments provided herein, the coupling of the modules to each other may be electrical, mechanical, or other.
In addition, each functional module in each embodiment of the present application may be integrated into one processing module, or each module may exist alone physically, or two or more modules may be integrated into one module. The integrated modules may be implemented in hardware or in software functional modules.
According to the scheme, after the open-circuit voltage of the charging pile is obtained, the target charging mode of the battery pack is further determined in the preset charging mode based on the value of the open-circuit voltage, wherein the preset charging mode comprises a series charging mode and a parallel charging mode. And further determining the total charging current of the battery pack based on the determined target charging mode under the condition that the reference currents corresponding to the plurality of battery packs are determined. The battery pack in the application can adaptively adjust the target charging mode based on the value of the open-circuit voltage of the charging pile, so that the battery pack can be compatible with charging piles of different charging standards. And further calculating the total charging current in the corresponding target charging mode based on the target charging mode, so that the battery pack can be ensured to be smoothly charged by the charging pile.
Referring to fig. 12, there is shown a vehicle 1200 according to an embodiment of the present application, where the smart device 1200 includes: one or more processors 1210, memory 1220, and one or more application programs. Wherein one or more application programs are stored in the memory and configured to be executed by the one or more processors, the one or more program configured to perform the battery pack charge control method described above.
Processor 1210 may include one or more processing cores. The processor 1210 connects various parts within the overall battery management system using various interfaces and lines, performs various functions of the battery management system and processes data by executing or executing instructions, programs, code sets, or instruction sets stored in the memory 1220, and invoking data stored in the memory 1220. Alternatively, the processor 1210 may be implemented in hardware in at least one of digital signal processing (Digital Signal Processing, DSP), field programmable gate array (Field-Programmable Gate Array, FPGA), programmable logic array (Programmable Logic Array, PLA). The processor 1210 may integrate one or a combination of several of a central processor 1210 (Central Processing Unit, CPU), an image processor 1210 (Graphics Processing Unit, GPU), a modem, etc. The CPU mainly processes an operating system, a user interface, an application program and the like; the GPU is used for being responsible for rendering and drawing of display content; the modem is used to handle wireless communications. It will be appreciated that the modem may not be integrated into the processor 1210 and may be implemented solely by a single communication chip.
The Memory 1220 may include a random access Memory 1220 (Random Access Memory, RAM) or a Read-Only Memory 1220 (Read-Only Memory). Memory 1220 may be used to store instructions, programs, code, sets of codes, or sets of instructions. The memory 1220 may include a stored program area and a stored data area, wherein the stored program area may store instructions for implementing an operating system, instructions for implementing at least one function (such as a touch function, a sound playing function, an image playing function, etc.), instructions for implementing various method embodiments described below, etc. The storage data area may also store data created by the electronic device map in use (e.g., phonebook, audiovisual data, chat log data), and the like.
Referring to fig. 13, an embodiment of the present application further provides a computer readable storage medium 1300, where computer program instructions 1310 are stored in the computer readable storage medium 1300, and the computer program instructions 1310 may be called by a processor to perform the method described in the above embodiment.
The computer readable storage medium may be an electronic memory such as a flash memory, an EEPROM (electrically erasable programmable read only memory), an EPROM, a hard disk, or a ROM. Optionally, the computer readable storage medium comprises a non-volatile computer readable storage medium (non-transitory computer-readable storage medium). The computer readable storage medium 1300 has storage space for program code to perform any of the method steps described above. The program code can be read from or written to one or more computer program products. The program code may be compressed, for example, in a suitable form.
The foregoing description is not intended to limit the preferred embodiments of the present application, but is not intended to limit the scope of the present application, and any such modifications, equivalents and adaptations of the embodiments described above in accordance with the principles of the present application should and are intended to be within the scope of the present application, as long as they do not depart from the scope of the present application.

Claims (8)

1. A method of controlling charge of a battery pack, the battery pack comprising a plurality of battery packs, the method comprising:
acquiring an open-circuit voltage of a charging pile;
determining a target charging mode of the battery pack in a preset charging mode based on the open circuit voltage; the preset charging modes comprise a serial charging mode and a parallel charging mode, wherein the serial charging mode represents that a plurality of battery packs are in a serial state in the charging process, and the parallel charging mode represents that the plurality of battery packs are in a parallel state in the charging process;
Determining a plurality of reference currents respectively corresponding to a plurality of battery packs, wherein the reference currents represent maximum charging currents allowed by the battery packs in the target charging mode;
determining a total charge current of the battery pack based on a plurality of the reference currents and the target charge mode;
requesting the charging total current from the charging post to charge the battery pack;
wherein if the target charging mode is a parallel charging mode, after the requesting the charging pile for the total charging current to charge the battery pack, the method further comprises:
acquiring a plurality of actual charging currents corresponding to the battery packs respectively after charging the battery packs for a preset time period based on the total charging current;
if at least one battery pack corresponding to the actual charging current is larger than the reference current corresponding to the battery pack, determining at least one battery pack as an abnormal battery pack, and determining the rest battery packs as non-abnormal battery packs;
determining the current overcharge of the abnormal battery pack, wherein the current overcharge is the difference value between the actual charging current of the abnormal battery pack and the reference current corresponding to the abnormal battery pack;
Determining a correction current of the abnormal battery pack based on the current overcharge, wherein the correction current is a difference value between a reference current corresponding to the abnormal battery pack and the current overcharge;
determining a second target reference current based on the correction current of the abnormal battery pack and the reference current corresponding to the non-abnormal battery pack, wherein the second target reference current is the minimum value of the correction current and the reference current corresponding to the non-abnormal battery pack;
determining a product of the second target reference current and the number of the battery packs connected in parallel as a corrected total charging current;
and requesting the corrected charging total current from the charging pile.
2. The method of claim 1, wherein the battery pack includes a plurality of cells, and wherein the determining a plurality of reference currents respectively corresponding to a plurality of the battery packs includes:
a01, determining the working temperature and the working voltage respectively corresponding to a plurality of electric cores in the battery pack;
step A03, determining a plurality of battery cell reference currents corresponding to a plurality of battery cells respectively according to the working temperature and the working voltage based on a preset current model, wherein the current model is used for representing a three-dimensional model of the corresponding relation among the working temperature, the working voltage and the battery cell reference currents of the battery cells;
Step A05, determining the reference current of the battery pack based on a plurality of the battery cell reference currents;
and (3) according to the steps A01, A03 and A05, obtaining a plurality of reference currents corresponding to the battery packs respectively.
3. The method of claim 2, wherein the determining the total charge current of the battery pack based on the plurality of reference currents and the target charge mode comprises:
determining a first target reference current based on a plurality of the reference currents, the first target reference current characterizing a minimum value of the plurality of the reference currents;
if the target charging mode is a parallel charging mode, acquiring the number of the battery packs connected in parallel, and determining the product of the first target reference current and the number as the total charging current of the battery pack;
and if the target charging mode is a series charging mode, determining the first target reference current as the total charging current of the battery pack.
4. The method of claim 1, wherein determining a target charging mode of the battery pack among preset charging modes based on the open circuit voltage comprises:
if the open-circuit voltage is greater than or equal to a preset voltage threshold, determining that the target charging mode is a series charging mode, wherein the preset voltage threshold represents the maximum total charging voltage of the battery pack in the series charging mode;
And if the open-circuit voltage is smaller than the preset voltage threshold value, determining that the target charging mode is a parallel charging mode.
5. A battery management system, the battery management system including a battery pack, a charging circuit and a controller, the battery pack including a plurality of battery packs, the charging circuit including a parallel control module and a series control module respectively connected with the battery pack, the controller being electrically connected with the charging circuit, the controller being configured to:
acquiring an open-circuit voltage of a charging pile and determining a target charging mode of the battery pack in a preset charging mode based on the open-circuit voltage; the preset charging mode comprises a serial charging mode or a parallel charging mode, the serial charging mode represents that a plurality of battery packs are in a serial state in the charging process, and the parallel charging mode represents that the plurality of battery packs are in a parallel state in the charging process;
determining a plurality of reference currents respectively corresponding to a plurality of battery packs, wherein the reference currents represent maximum charging currents allowed by the battery packs in the target charging mode;
determining a total charge current of the battery pack based on a plurality of the reference currents and the target charge mode;
If the target charging mode is the parallel charging mode, controlling the parallel control module to be conducted so that the parallel control module and a plurality of battery packs form a parallel charging loop, and requesting the charging pile for the total charging current so as to charge the battery pack;
acquiring a plurality of actual charging currents corresponding to the battery packs respectively after charging the battery packs for a preset time period based on the total charging current;
if at least one battery pack corresponding to the actual charging current is larger than the reference current corresponding to the battery pack, determining at least one battery pack as an abnormal battery pack, and determining the rest battery packs as non-abnormal battery packs;
determining the current overcharge of the abnormal battery pack, wherein the current overcharge is the difference value between the actual charging current of the abnormal battery pack and the reference current corresponding to the abnormal battery pack;
determining a correction current of the abnormal battery pack based on the current overcharge, wherein the correction current is a difference value between a reference current corresponding to the abnormal battery pack and the current overcharge;
determining a second target reference current based on the correction current of the abnormal battery pack and the reference current corresponding to the non-abnormal battery pack, wherein the second target reference current is the minimum value of the correction current and the reference current corresponding to the non-abnormal battery pack;
Determining a product of the second target reference current and the number of the battery packs connected in parallel as a corrected total charging current;
requesting the corrected charging total current from the charging pile;
and if the target charging mode is the series charging mode, controlling the series control module to be conducted so that the series control module and a plurality of battery packs form a series charging loop, and requesting the charging total current to the charging pile so as to charge the battery pack.
6. The battery management system of claim 5 wherein the charging circuit further comprises a plurality of current sensors in series with a plurality of the battery packs in a one-to-one correspondence forming a plurality of charging branches, the charging branches having an output and an input;
the plurality of parallel control modules comprise two parallel control units; two ends of one parallel control unit are respectively connected with the output ends of the adjacent first charging branch and second charging branch, and two ends of the other parallel control unit are respectively connected with the input ends of the first charging branch and the second charging branch;
the plurality of series control modules are arranged, and two ends of each series control module are respectively connected with the output end of the first charging branch and the input end of the second charging branch.
7. A charge control device of a battery pack, the battery pack comprising a plurality of battery packs, the device comprising:
the open circuit voltage acquisition module is used for acquiring the open circuit voltage of the charging pile;
a target charging mode determining module for determining a target charging mode of the battery pack in a preset charging mode based on the open circuit voltage; the preset charging modes comprise a serial charging mode and a parallel charging mode, wherein the serial charging mode represents that a plurality of battery packs are in a serial state in the charging process, and the parallel charging mode represents that the plurality of battery packs are in a parallel state in the charging process;
the reference current determining module is used for determining a plurality of reference currents corresponding to the battery packs respectively, and the reference currents represent the maximum charging current allowed by the battery packs in the target charging mode;
a total charge current determination module configured to determine a total charge current of the battery pack based on a plurality of the reference currents and the target charge mode;
the current request module is used for requesting the charging total current to the charging pile;
if the target charging mode is a parallel charging mode, the device further includes:
The actual charging current acquisition module is used for acquiring a plurality of actual charging currents corresponding to the battery packs respectively after a preset duration of charging the battery pack based on the total charging current;
the abnormal battery pack determining module is used for determining at least one battery pack as an abnormal battery pack if the actual charging current corresponding to the at least one battery pack is larger than the reference current corresponding to the battery pack, and determining the rest battery packs as non-abnormal battery packs;
the current overcharge determining module is used for determining the current overcharge of the abnormal battery pack, wherein the current overcharge is the difference value between the actual charging current of the abnormal battery pack and the reference current corresponding to the abnormal battery pack;
the correction charging total current determining module is used for determining correction current of the abnormal battery pack based on the current overcharge, wherein the correction current is a difference value between a reference current corresponding to the abnormal battery pack and the current overcharge; determining a second target reference current based on the correction current of the abnormal battery pack and the reference current corresponding to the non-abnormal battery pack, wherein the second target reference current is the minimum value of the correction current and the reference current corresponding to the non-abnormal battery pack; determining a product of the second target reference current and the number of the battery packs connected in parallel as the corrected charging total current;
The current request module is also used for requesting the corrected charging total current from the charging pile.
8. A vehicle, characterized by comprising:
one or more processors;
a memory;
one or more applications, wherein the one or more applications are stored in the memory and configured to be executed by the one or more processors, the one or more applications configured to perform the method of any of claims 1-4.
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Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114884175A (en) * 2022-06-10 2022-08-09 上海派智能源有限公司 Charging control method of battery pack, power supply system and charger
CN116826209A (en) * 2023-07-04 2023-09-29 深圳市龙星辰电源有限公司 Method, system, storage medium and device for obtaining battery connection in battery pack

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0984274A (en) * 1995-09-14 1997-03-28 Nissan Motor Co Ltd Charge controller for battery pack
CN106364348A (en) * 2016-09-26 2017-02-01 华为技术有限公司 Charging pile
CN108583340A (en) * 2018-05-11 2018-09-28 江铃汽车股份有限公司 A kind of electric automobile power battery system fast charge method
CN112874327A (en) * 2021-01-11 2021-06-01 广州橙行智动汽车科技有限公司 Vehicle charging circuit, vehicle charging method, vehicle charging device, and storage medium
CN113437778A (en) * 2021-07-22 2021-09-24 深圳市正浩创新科技股份有限公司 Multi-battery pack charging management method and device, energy storage equipment and readable storage medium
WO2021190196A1 (en) * 2020-03-27 2021-09-30 东莞新能安科技有限公司 Charging and discharging management method for parallel battery packs, electronic device, and electrical system

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011135657A (en) * 2009-12-22 2011-07-07 Sanyo Electric Co Ltd Battery system and vehicle with the same, and method for detecting current limit state of the battery system

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0984274A (en) * 1995-09-14 1997-03-28 Nissan Motor Co Ltd Charge controller for battery pack
CN106364348A (en) * 2016-09-26 2017-02-01 华为技术有限公司 Charging pile
CN108583340A (en) * 2018-05-11 2018-09-28 江铃汽车股份有限公司 A kind of electric automobile power battery system fast charge method
WO2021190196A1 (en) * 2020-03-27 2021-09-30 东莞新能安科技有限公司 Charging and discharging management method for parallel battery packs, electronic device, and electrical system
CN112874327A (en) * 2021-01-11 2021-06-01 广州橙行智动汽车科技有限公司 Vehicle charging circuit, vehicle charging method, vehicle charging device, and storage medium
CN113437778A (en) * 2021-07-22 2021-09-24 深圳市正浩创新科技股份有限公司 Multi-battery pack charging management method and device, energy storage equipment and readable storage medium

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