CN114604130A - Charging method and system for vehicle, electronic device and readable storage medium - Google Patents

Charging method and system for vehicle, electronic device and readable storage medium Download PDF

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Publication number
CN114604130A
CN114604130A CN202210275916.2A CN202210275916A CN114604130A CN 114604130 A CN114604130 A CN 114604130A CN 202210275916 A CN202210275916 A CN 202210275916A CN 114604130 A CN114604130 A CN 114604130A
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China
Prior art keywords
battery
charging
charge
charging mode
state
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Granted
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CN202210275916.2A
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Chinese (zh)
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CN114604130B (en
Inventor
张丽娟
沈得贵
宁丁
张良钰
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Xi'an Telingchong New Energy Technology Co ltd
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Xi'an Telingchong New Energy 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
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B60L58/12—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to state of charge [SoC]
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L2240/00—Control parameters of input or output; Target parameters
    • B60L2240/40—Drive Train control parameters
    • B60L2240/54—Drive Train control parameters related to batteries
    • B60L2240/547—Voltage
    • 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 present application relates to a vehicle charging method, a vehicle charging system, an electronic device and a readable storage medium. The method comprises the following steps: acquiring an initial state of charge of the battery; if the initial state of charge is in a first numerical range, charging and discharging the battery in an online charging mode; the method comprises the steps that when a battery is charged and discharged in an online charging mode, the actually measured charge state of the battery is obtained; and if the actually measured charge state is in the second numerical value range, stopping charging and discharging the battery in an online charging mode. The method and the device have the advantages that the actually measured state of charge of the battery is obtained, if the actually measured state of charge is in the second numerical value range, the battery is stopped to be charged and discharged in the online charging mode, the state of charge is always kept in the first numerical value range when the battery is charged and discharged in the online charging mode, the battery is charged safely, the phenomenon that the battery is overcharged or overdischarged when the battery is charged in the online charging mode is avoided, and therefore the safety of the online charging mode for charging the battery is improved.

Description

Charging method and system for vehicle, electronic device and readable storage medium
Technical Field
The present application relates to a vehicle charging method, a vehicle charging system, an electronic device and a readable storage medium.
Background
Most of the existing technologies for charging a battery in an online charging mode are technologies for efficiently charging the battery, and the safety of charging the battery in the online charging mode cannot be guaranteed.
The current safe charging technology is not suitable for the charging mode of online charging, so that the safety of the current online charging mode for charging the battery is low.
Disclosure of Invention
The embodiment of the application provides a vehicle charging method, a vehicle charging system, electronic equipment and a readable storage medium, and aims to solve the problem that the safety of battery charging in the existing online charging mode is low.
In a first aspect, an embodiment of the present application provides a charging method for a vehicle, where the method includes:
acquiring an initial state of charge of the battery;
if the initial state of charge is in a first numerical range, charging and discharging the battery in an online charging mode, wherein the first numerical range is the range of the state of charge when the battery is safely charged, and the online charging mode is that the battery discharges when the battery is charged;
acquiring an actually measured charge state of the battery when the battery is charged and discharged in an online charging mode;
and if the actually measured charge state is in a second numerical range, stopping charging and discharging the battery in an online charging mode, wherein the second numerical range is the range of the charge state when the battery is overcharged or overdischarged.
In a possible implementation manner of the first aspect, if the initial state of charge is within a first value range, the charging and discharging the battery in an online charging mode includes:
and if the initial state of charge is greater than or equal to a first threshold and less than or equal to a second threshold, charging and discharging the battery in an online charging mode.
Wherein, when charging and discharging the battery in an online charging mode, the method further comprises:
acquiring the measured voltage, the preset limit voltage and the target voltage of the battery, wherein the target voltage of the battery is the voltage corresponding to the second threshold;
when the preset limit voltage is set to be not less than the target voltage, if the fact that the actually measured voltage of the battery rises to the preset limit voltage is detected, the battery is stopped to be charged.
Wherein said charging and discharging said battery in an online charging mode comprises:
acquiring the measured voltage, the preset limit voltage and the target voltage of the battery, wherein the target voltage of the battery is the voltage corresponding to a second threshold value of the initial state of charge, and the second threshold value is the upper limit value of the first numerical range;
when the preset limit voltage is set to be smaller than the target voltage, if the actual measurement voltage of the battery is detected to rise to the preset limit voltage, the battery is stopped to be charged, and after the actual measurement voltage of the battery is detected to rise to the preset limit voltage, the actual measurement voltage of the battery is detected to fall to be smaller than the preset limit voltage, and the battery is charged again.
Wherein the charging and discharging the battery in an online charging mode further comprises:
and if the measured voltage of the battery is detected to be greater than the preset limit voltage, stopping charging the battery until the measured voltage is greater than the target voltage.
Wherein if the measured state of charge is within a second value range, stopping charging and discharging the battery in an online charging mode, comprising:
and if the actual measurement state of charge is smaller than a first threshold value, charging the battery in a normal charging mode, and charging the battery in an online charging mode when the actual measurement state of charge is equal to the first threshold value, wherein the normal charging mode is that a vehicle-mounted charger charges the battery, and the battery does not discharge.
Wherein if the measured state of charge is within a second numerical range, stopping charging and discharging the battery in an online charging mode, further comprising:
and if the actually measured charge state is larger than a second threshold value, stopping charging and discharging the battery in an online charging mode.
Wherein the first range of values includes a range of values greater than or equal to a first threshold and less than or equal to a second threshold, and the second range of values includes a range of values less than the first threshold or greater than the second threshold, the method further comprising:
acquiring a preset return difference of the state of charge;
and decreasing or increasing the preset back difference between the first threshold and the second threshold to adjust the first numerical range and the second numerical range.
In a second aspect, an embodiment of the present application provides a charging apparatus for a vehicle, the apparatus including:
the first acquisition module is used for acquiring the initial charge state of the battery;
the first charging and discharging module is used for charging and discharging the battery in an online charging mode if the initial charge state is in a first numerical range, wherein the first numerical range is the range of the charge state when the battery is safely charged, and the online charging mode is that the battery discharges when the battery is charged;
the second acquisition module is used for acquiring the actually measured charge state of the battery when the battery is charged and discharged in an online charging mode;
and the second charging and discharging module is used for stopping charging and discharging the battery in an online charging mode if the actually measured charge state is in a second numerical range, wherein the second numerical range is the charge state range when the battery is overcharged or overdischarged.
In a third aspect, an embodiment of the present application provides an electronic device, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, and the processor implements the charging method for a vehicle according to the first aspect when executing the computer program.
In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium storing a computer program, which when executed by a processor implements the charging method for a vehicle according to the first aspect.
Compared with the prior art, the embodiment of the application has the advantages that: the method comprises the steps of obtaining an initial charge state of a battery; if the initial state of charge is in a first numerical range, the battery is charged and discharged in an online charging mode, the first numerical range is the range of the state of charge when the battery is safely charged, and the online charging mode is that the battery is discharged while the battery is charged; the method comprises the steps that when a battery is charged and discharged in an online charging mode, the actually measured charge state of the battery is obtained; and if the actually measured charge state is in a second numerical range, stopping charging and discharging the battery in an online charging mode, wherein the second numerical range is the range of the charge state when the battery is overcharged or overdischarged. The method and the device have the advantages that the actually measured state of charge of the battery is obtained, if the actually measured state of charge is in the second numerical value range, the battery is stopped to be charged and discharged in the online charging mode, the state of charge is always kept in the first numerical value range when the battery is charged and discharged in the online charging mode, the battery is charged safely, the phenomenon that the battery is overcharged or overdischarged when the battery is charged in the online charging mode is avoided, and therefore the safety of the online charging mode for charging the battery is improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic view of an application scenario of a charging method for a vehicle according to an embodiment of the present application;
FIG. 2 is a schematic flow chart diagram of a charging method for a vehicle provided by an embodiment of the application;
fig. 3a is a specific schematic flowchart of S202 in a charging method of a vehicle according to an embodiment of the present application;
fig. 3b is a schematic flowchart of another method for charging a battery to be charged in an online charging mode according to an embodiment of the present application;
fig. 4 is a specific schematic flowchart of S204 in a charging method for a vehicle according to an embodiment of the present application;
fig. 5 is another specific schematic flowchart of S204 in a charging method of a vehicle according to an embodiment of the present application;
FIG. 6 is a schematic flow chart of a method for preventing battery SOC from jumping back and forth according to an embodiment of the present disclosure;
fig. 7 is a schematic structural diagram of a charging device of a vehicle according to an embodiment of the present disclosure;
fig. 8 is a schematic structural diagram of a terminal device according to an embodiment of the present application.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the present application. It will be apparent, however, to one skilled in the art that the present application may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present application with unnecessary detail, and in other instances, specific technical details may be mutually referenced in various embodiments, and a specific system not described in one embodiment may be referenced in other embodiments.
It will be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It should also be understood that the term "and/or" as used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.
Reference throughout this specification to "one embodiment of the present application" or "some embodiments" or the like means that a particular feature, structure, or characteristic described in connection with the embodiment is included in one or more embodiments of the present application. Thus, appearances of the phrases "in other embodiments," "an embodiment of the present application," "other embodiments of the present application," or the like, in various places throughout this specification are not necessarily all referring to the same embodiment, but rather mean "one or more but not all embodiments" unless specifically stated otherwise. The terms "comprising," "including," "having," and variations thereof mean "including, but not limited to," unless expressly specified otherwise.
Furthermore, in the description of the present application and the appended claims, the terms "first," "second," and the like are used for distinguishing between descriptions and not necessarily for describing or implying relative importance.
Most of the existing technologies for charging a battery in an online charging mode are technologies for efficiently charging the battery, and the safety of charging the battery in the online charging mode cannot be guaranteed.
The current safe charging technology is not suitable for the charging mode of online charging, so that the safety of the current online charging mode for charging the battery is low, and the current safe charging technology only sets a safety protection mechanism on a battery management system and does not set a safety protection mechanism on a vehicle-mounted charger.
In order to solve the above defects, the inventive concept of the present application is:
in order to avoid overcharging or overdischarging of a battery when the battery is charged in an online charging mode, two safety lines are arranged on a vehicle-mounted charger, one safety line is used for acquiring the initial charge state of the battery by the vehicle-mounted charger, whether the initial charge state belongs to the numerical range for charging in the online charging mode is judged, if the initial charge state belongs to the numerical range, the battery is charged in the online charging mode, then the actual measurement charge state in the charging process of the battery is acquired by the vehicle-mounted charger, whether the actual measurement charge state belongs to the numerical range for stopping charging in the online charging mode is judged, and if the actual measurement charge state belongs to the numerical range for stopping charging in the online charging mode, the charging in the online charging mode is stopped.
And the other way is that the vehicle-mounted charger sets a preset limit voltage, and when the battery cannot be charged in an online charging mode through a first defense line, the battery is stopped to be charged when the actually measured voltage rises to the preset limit voltage.
In order to explain the technical means of the present application, the following description will be given by way of specific examples.
Referring to fig. 1, fig. 1 is a schematic view of an application scenario of a charging method for a vehicle according to an embodiment of the present disclosure, and for convenience of description, only a portion related to the present disclosure is shown. The application scenario includes: charging pile 100, vehicle-mounted charger 200, battery 300 and load 400.
In this application scenario, the charging pile 100 refers to a charging device for providing a charging service for an electric vehicle, and the charging pile 100 includes an ac charging pile.
The vehicle-mounted charger 200 is a charger fixedly installed on a vehicle. The Controller Area Network (CAN) is provided, and the CAN communicates with a Battery Management System (BMS) to acquire parameter data such as voltage, current, and State of Charge (SOC) of the Battery. Through the parameter data, the safety protection mechanism in the embodiment of the application is executed, and the function of safely charging the battery is realized.
The battery 300 in this application scenario may be a lithium ion battery or a sodium ion battery, and the embodiment of the present application does not limit the type of the battery 300. The battery 300 is used to supply power to the load 400.
The load 400 is also called an electric drive system, and the electric drive system drives the vehicle to operate according to the amount of power provided by the battery 300.
Referring to fig. 2, fig. 2 is a schematic flowchart of a charging method for a vehicle according to an embodiment of the present disclosure. The execution subject of the method in fig. 2 may be the vehicle-mounted charger 200 in fig. 1. As shown in fig. 2, the method includes: s201 to S205.
S201, monitoring a charging instruction in an online charging mode.
In the embodiment of the application, when the vehicle-mounted charger charges the battery, it is required to determine which charging mode to charge the battery.
The charging mode in the embodiment of the application has two types, one is an online charging mode, and the other is a normal charging mode. In the online charging mode, the vehicle-mounted charger charges the battery, and the battery discharges to provide electric quantity for the load, so that the charging and discharging of the battery are realized. In the normal charging mode, the vehicle-mounted charger charges the battery, the battery does not discharge, and the electric quantity supplied to the load is stopped.
In the embodiment of the application, the Vehicle-mounted charger determines the charging mode to charge the battery by monitoring whether a Vehicle Control Unit (VCU) of the Vehicle issues a command for charging in the online charging mode.
S202, determining whether the state of the battery to be charged meets the condition of charging in an online charging mode.
Specifically, the state of the battery to be charged refers to a state of charge SOC of the battery to be charged, and the SOC is used for reflecting the remaining capacity of the battery. In the embodiment of the present application, the preset conditions for entering the online charging mode to charge the battery are as follows: the initial state of charge is within a first range of values.
In the embodiment of the application, if an instruction for charging in the online charging mode is monitored within a preset time, it is further required to determine whether the state of the battery to be charged meets a condition for charging in the online charging mode, and if the condition is met, the battery can be charged in the online charging mode.
Referring to fig. 3a, fig. 3a is a specific schematic flowchart of S202 in the charging method for a vehicle according to the embodiment of the present application. The execution subject of the method in fig. 3a may be the vehicle-mounted charger 200 in fig. 1. As shown in fig. 3a, the method comprises: s301 to S304.
S301, acquiring the initial charge state of the battery.
Specifically, in the embodiment of the present application, after monitoring an instruction to perform charging in an online charging mode, the vehicle-mounted charger needs to acquire an initial state of charge SOC of the battery before charging, where the initial state of charge in the embodiment of the present application is a state of charge before charging.
The BMS monitors the SOC of the battery in real time, the BMS transmits the monitored state of charge of the battery before charging to the vehicle-mounted charger through the CAN, and the vehicle-mounted charger CAN acquire the initial state of charge of the battery.
And S302, determining the numerical range of the initial state of charge of the battery.
In the embodiment of the application, after the initial state of charge of the battery is obtained, the numerical range to which the initial state of charge of the battery belongs needs to be judged, and whether the state of the battery meets the condition of charging in the online charging mode or not can be determined according to the numerical range to which the initial state of charge of the battery belongs.
And S303, if the initial charge state is in the first numerical range, charging and discharging the battery in an online charging mode.
Specifically, when the first numerical range is preset, as long as the safe charging of the battery can be ensured, the range of the state of charge which does not cause the overcharge or the overdischarge of the battery can be set as the first numerical range, and therefore, the first numerical range is the range of the state of charge when the battery is safely charged. In the embodiment of the present application, the first numerical range may be expressed as:
the first threshold is less than or equal to the initial state of charge and less than or equal to the second threshold.
In the embodiment of the application, after the initial state of charge of the battery is obtained, if the first threshold is not more than the initial state of charge and not more than the second threshold, the condition of charging in the online charging mode is met, and the battery is charged and discharged in the online charging mode.
In some embodiments, the first range of values may be:
the initial charge state is more than or equal to 20 percent and less than or equal to 90 percent.
In some embodiments, if the initial state of charge is determined to be 20% or more and 90% or less, the charging condition in the online charging mode is satisfied, and the battery is charged and discharged in the online charging mode.
It should be noted that the first threshold and the second threshold in the embodiment of the present application may also be other values, and the embodiment of the present application is explained with the first threshold being 20% and the second threshold being 90%.
And S304, if the initial state of charge is in the second numerical range, charging and discharging the battery in a normal charging mode.
Specifically, in the embodiment of the present application, the second numerical range may be: initial state of charge < first threshold, e.g. initial state of charge < 20%. The second range of values may also be: initial state of charge > a second threshold, e.g. initial state of charge > 90%.
In the embodiment of the application, after the vehicle-mounted charger acquires the initial state of charge of the battery, if the initial state of charge is less than a first threshold (20%), the condition for charging in the online charging mode is not met, an alarm for low battery power is reported to the VCU, the alarm aims to prompt that the load should be disconnected, the battery is charged in the normal charging mode, the service life of the battery is prolonged, and when the state of charge of the battery meets the condition for charging in the online charging mode, the battery is charged in the online charging mode.
In the embodiment of the application, after the vehicle-mounted charger acquires the initial state of charge of the battery, if the initial state of charge is greater than a second threshold (90%), and the condition that the charging is performed in the online charging mode is not met, the battery is charged in the normal charging mode until the battery is fully charged.
And S203, charging the battery to be charged in an online charging mode.
Specifically, in the embodiment of the present application, if it is determined that the state of the battery to be charged satisfies the condition for charging in the online charging mode according to S202, the battery to be charged is charged in the online charging mode.
In other embodiments, another method for charging a battery to be charged in an online charging mode is provided, please refer to fig. 3b, and fig. 3b is a schematic flowchart of another method for charging a battery to be charged in an online charging mode according to an embodiment of the present application. The main execution body of the method in fig. 3b may be the vehicle-mounted charger 200 in fig. 1. As shown in fig. 3b, the method comprises: s305 to S306.
S305, acquiring the measured voltage, the preset limit voltage and the target voltage of the battery.
Specifically, the target voltage of the battery is a voltage corresponding to the second threshold value as the initial state of charge, and the second threshold value is an upper limit value of the first numerical range.
Illustratively, the first range of values is: when the initial state of charge is more than or equal to 20% and less than or equal to 90%, the second threshold value is 90%, and the target voltage of the battery is the corresponding battery voltage when the SOC of the battery is 90%. For example: the voltage at which the battery SOC is 100% is 700V, and the target voltage is 630V.
S306, when the preset limit voltage is set to be smaller than the target voltage, if the measured voltage of the battery is detected to rise to the preset limit voltage, the battery is stopped to be charged, and after the measured voltage of the battery is detected to rise to the preset limit voltage, the battery is charged again when the measured voltage of the battery is detected to fall to be smaller than the preset limit voltage.
Specifically, in the embodiment of the present application, the preset limit voltage is set to be smaller than the target voltage.
For example, in this embodiment of the application, the preset limit voltage is set to a battery voltage (e.g., 595V) corresponding to 85% of the SOC of the battery, and during the charging in the online charging mode, the battery voltage is always maintained at the SOC of 20% to 85%, and if it is detected that the measured voltage of the battery rises to the preset limit voltage 595V, the voltage of the vehicle-mounted charger is the same as the battery voltage, the output current of the vehicle-mounted charger is 0, the vehicle-mounted charger stops providing energy to the battery, and when the battery supplies energy to the load, the battery voltage drops, and the vehicle-mounted charger restarts providing energy to the battery. In this way, the SOC of the normal battery reaches 85% at most, and the vehicle-mounted charger cannot exit the online charging mode and stop.
When the SOC of the battery is increased due to repeated reverse flow of the battery under load, the vehicle-mounted charger exits the online charging mode and stops outputting energy when the SOC is larger than 90%.
And S204, determining whether the battery state in the charging process meets the condition of stopping charging in the online charging mode.
Specifically, the battery state during charging refers to the state of charge SOC of the battery during charging. In the embodiment of the present application, the conditions for stopping charging the battery in the online charging mode are multiple, and the first condition is: the measured state of charge is within a second range of values. In the embodiment of the present application, the first condition is a condition that the online charging mode exits in a normal state. Namely, the result of calculating the SOC of the battery by the BMS is correct, the communication between the BMS and the vehicle-mounted charger is normal, and the vehicle-mounted charger can normally exit from the condition of the online charging mode.
Referring to fig. 4, fig. 4 is a specific schematic flowchart of S204 in the charging method for a vehicle according to the embodiment of the present application. The execution subject of the method in fig. 4 may be the vehicle-mounted charger 200 in fig. 1. As shown in fig. 4, the method includes: s401 to S404.
S401, when the battery is charged and discharged in an online charging mode, the actually measured charge state of the battery is obtained.
Specifically, in the embodiment of the application, when the battery is charged and discharged in an online charging mode, the BMS monitors the SOC in the charging process of the battery in real time, the BMS transmits the SOC of the battery monitored in real time to the vehicle-mounted charger through the CAN, and the vehicle-mounted charger CAN acquire the actually measured state of charge of the battery.
Illustratively, the BMS transmits the measured SOC to the vehicle-mounted charger in a periodic transmission manner (e.g., once every 1 minute) via the CAN, and the vehicle-mounted charger CAN obtain the measured SOC during the charging process of the battery in real time.
S402, determining a numerical range of the measured state of charge of the battery.
In the embodiment of the application, after the actual measurement state of charge of the battery is obtained, the numerical range to which the actual measurement state of charge of the battery belongs needs to be judged, and whether the state of the battery meets the condition of exiting to charge the battery in the online charging mode or not can be determined according to the numerical range to which the actual measurement state of charge of the battery belongs.
And S403, if the actually measured state of charge is in the second numerical range, stopping charging and discharging the battery in an online charging mode.
In the embodiment of the present application, the second numerical range is a range of a state of charge when the battery is overcharged or overdischarged. In some embodiments, after obtaining the measured state of charge, if the measured state of charge of the battery is within the second range of values, it is proved that if the charging of the battery in the online charging mode is continued, there is a risk of causing overcharge or overdischarge of the battery, and the charging and discharging of the battery in the online charging mode should be stopped immediately.
In this embodiment of the application, the preset second value range is the same as the second value range set in S304, and details thereof are not repeated here.
In the embodiment of the application, if the measured state of charge is smaller than the first threshold, the charging and discharging of the battery in the online charging mode are stopped, the battery is charged in the normal charging mode, and the battery is charged in the online charging mode until the measured state of charge is equal to the first threshold.
In the embodiment of the application, if the measured state of charge is greater than the second threshold, the charging and discharging of the battery in the online charging mode are stopped, and the battery is charged in the normal charging mode until the measured state of charge is equal to 100%.
And S404, if the actually measured charge state is in the first numerical range, continuously charging and discharging the battery in an online charging mode.
In the embodiment of the application, if the measured state of charge of the battery is in the first numerical range, the measured state of charge of the battery is proved to be not in accordance with the condition of stopping charging and discharging the battery in the online charging mode, and the battery is continuously charged and discharged in the online charging mode.
The preset first numerical range is the same as the first numerical range set in S303, and is not described herein again.
In the embodiment of the present application, the second condition for stopping charging the battery in the online charging mode is: the measured voltage of the battery rises to a preset limit voltage. In the embodiment of the application, the second condition is a condition that the result of calculating the SOC of the battery by the BMS is wrong, the communication between the BMS and the vehicle-mounted charger is abnormal, and the vehicle-mounted charger cannot normally exit the online charging mode.
Referring to fig. 5, fig. 5 is another specific schematic flowchart of S204 in the charging method for a vehicle according to the embodiment of the present application. The execution subject of the method in fig. 5 may be the vehicle-mounted charger 200 in fig. 1. As shown in fig. 5, the method includes: s501 to S502.
S501, acquiring the actual measurement voltage, the preset limit voltage and the target voltage of the battery.
Specifically, the target voltage of the battery is a voltage corresponding to the second threshold.
And S502, when the preset limit voltage is not less than the target voltage, if the measured voltage of the battery is detected to be increased to the preset limit voltage, the battery is stopped to be charged.
Specifically, in the embodiment of the present application, the preset limit voltage is set to be not less than the target voltage, but less than the corresponding battery voltage (700V) when the battery SOC is 100%. For example, in the embodiment of the present application, the preset limit voltage is set to a battery voltage (e.g. 665V) corresponding to a battery SOC of 95%, and when the online charging mode cannot be exited under the first condition, and when it is detected that the measured voltage of the battery rises to the battery voltage corresponding to the battery SOC of 95%, the output current of the vehicle-mounted charger is 0, and the energy supply to the battery is stopped, so as to prevent the battery from being overcharged.
In other embodiments, the method of stopping charging the battery in the online charging mode under the second condition further comprises:
and if the detected actual measurement voltage of the battery is greater than the preset limit voltage, stopping charging the battery until the detected actual measurement voltage is greater than the target voltage.
Specifically, when the load reversely charges the battery for many times to increase the SOC of the battery, the actual measurement voltage is greater than the preset limit voltage.
Illustratively, the measured voltage of the battery is detected at regular time, and after the measured voltage of the battery is detected to be larger than the voltage corresponding to the situation that the SOC is equal to 85%, the measured voltage continuously rises until the measured voltage is larger than the target voltage when the SOC is equal to 90%, the battery is stopped being charged, and the battery is prevented from being overcharged.
In summary, the reason why the conditions for charging in the online charging mode in S202 and the conditions for stopping charging in the online charging mode in S204 are set in the present application is to ensure that the SOC of the battery is maintained within the first numerical range when the battery is charged in the online charging mode, and to prevent the battery from being overcharged or overdischarged due to charging of the battery in the online charging mode. And even when the online charging mode is used for charging the battery, the SOC of the battery exceeds the first numerical range, the charging of the battery can be stopped when the actually measured voltage of the battery rises to the preset limit voltage or the SOC of the battery does not exceed the first numerical range but exceeds the preset limit voltage, and the condition of over-charging or over-discharging of the battery cannot be caused, so that the safety of the online charging mode for charging the battery is improved.
In the embodiment of the application, in order to prevent the SOC of the battery from jumping back and forth, the vehicle-mounted charger is caused to jump back and forth in two states of charging the battery in an online charging mode and charging the battery in a normal charging mode, a return difference is preset, and the SOC is prevented from jumping back and forth through the return difference.
Referring to fig. 6, fig. 6 is a schematic flowchart of a method for preventing a battery SOC from jumping back and forth according to an embodiment of the present disclosure. The execution subject of the method in fig. 6 may be the vehicle-mounted charger 200 in fig. 1. As shown in fig. 6, the method includes: s601 to 602.
S601, acquiring a preset return difference of the charge state.
In the embodiment of the application, the BMS is provided with the preset return difference delta, the BMS transmits the delta to the vehicle-mounted charger through the CAN, and the vehicle-mounted charger CAN acquire the preset return difference of the charge state.
The preset return difference is set according to the specification of the battery. Illustratively, Δ is set to 2% to 5%, for example: Δ in the embodiment of the present application may be set to 5%.
S602, reducing or increasing the preset back difference between the first threshold and the second threshold to adjust the first numerical range and the second numerical range.
Specifically, when the first threshold and the second threshold are increased by the preset back difference, the adjusted first numerical range is as follows: first threshold + Δ < SOC < second threshold. The adjusted second value range is: SOC > second threshold + delta and SOC < first threshold.
Illustratively, the adjusted first range of values is: 25% < SOC < 90%. The adjusted second value range is: SOC > 95% and SOC < 20%.
In this embodiment of the present application, when the first threshold and the second threshold are reduced by the preset back difference, the adjusted first numerical range is: first threshold < SOC < second threshold- Δ. The adjusted second value range is: SOC > second threshold and SOC < first threshold-Delta.
Illustratively, the adjusted first range of values is: 20% < SOC < 85%. The adjusted second value range is: SOC > 90% and SOC < 15%.
In the embodiment of the present application, the first threshold is decreased by the preset back difference, the second threshold is increased by the preset back difference, and the adjusted second value range is: SOC < first threshold- Δ and SOC > second threshold + Δ.
Illustratively, the adjusted second value range is: SOC < 15% and SOC > 95%.
Of course, other ways of adjusting the first numerical range and the second numerical range by using the preset back difference exist in the embodiments of the present application, and the embodiments of the present application are not listed here.
It should be noted that, the adjusted first numerical range and the adjusted second numerical range may be applied to the above embodiments, and are used to determine whether the state of the battery to be charged satisfies the condition for charging in the online charging mode, and determine whether the state of the battery during the charging process satisfies the condition for stopping charging in the online charging mode.
And S205, charging the battery in a normal charging mode.
Specifically, in this embodiment of the application, if the instruction for charging in the online charging mode is not monitored within the preset time, the to-be-charged battery is charged in the normal charging mode in S201.
In the embodiment of the present application, when the rechargeable battery is charged in the normal charging mode, the battery is charged by the normal charging current according to the normal charging voltage (the voltage when the battery SOC is 100%) issued by the BMS. The normal charging current is obtained by reducing the maximum allowable current (the maximum current allowed by the battery issued by the BMS through the CAN) issued by the BMS, the maximum current (the CC signal of the charging pile CAN be judged by the accessible) borne by the gun head of the charging pile, and the maximum current (the CP signal of the charging pile CAN be judged by the accessible) borne by the gun head of the charging pile, so that the charging is started, the SOC of the battery is 100%, and when the SOC of the battery is 100%, the charging is stopped after the BMS issues a shutdown command.
In the embodiment of the present application, if it is determined according to S202 that the state of the battery to be charged is not sufficient for the charging condition in the online charging mode, the battery to be charged is charged in the normal charging mode. The method for charging the battery to be charged in the normal charging mode may refer to S304, and details thereof are not repeated here.
In summary, the present application obtains the initial state of charge of the battery; if the initial state of charge is in a first numerical range, the battery is charged and discharged in an online charging mode, the first numerical range is the range of the state of charge when the battery is safely charged, and the online charging mode is that the battery is discharged while the battery is charged; the method comprises the steps that when a battery is charged and discharged in an online charging mode, the actually measured charge state of the battery is obtained; and if the actually measured charge state is in a second numerical range, stopping charging and discharging the battery in an online charging mode, wherein the second numerical range is the range of the charge state when the battery is overcharged or overdischarged. The method and the device have the advantages that the actually measured state of charge of the battery is obtained, if the actually measured state of charge is in the second numerical value range, the battery is stopped to be charged and discharged in the online charging mode, the state of charge is always kept in the first numerical value range when the battery is charged and discharged in the online charging mode, the battery is charged safely, the phenomenon that the battery is overcharged or overdischarged when the battery is charged in the online charging mode is avoided, and therefore the safety of the online charging mode for charging the battery is improved.
It should be understood that, the sequence numbers of the steps in the foregoing embodiments do not imply an execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.
Referring to fig. 7, fig. 7 is a schematic structural diagram of a charging device for a vehicle according to an embodiment of the present application, where the charging device includes:
the first obtaining module 71 is configured to obtain an initial state of charge of the battery.
The first charging and discharging module 72 is configured to charge and discharge the battery in an online charging mode if the initial state of charge is within a first numerical range, where the first numerical range is a range of a state of charge when the battery is safely charged, and the online charging mode is a mode in which the battery is discharged while the battery is charged.
The second obtaining module 73 is configured to obtain an actually measured state of charge of the battery when the battery is charged and discharged in an online charging mode.
The second charge-discharge module 74 is configured to stop charging and discharging the battery in the online charge mode if the measured state of charge is within a second value range, where the second value range is a range of the state of charge when the battery is overcharged or overdischarged.
The first charge-discharge module 72 is further configured to charge and discharge the battery in an online charge mode if the initial state of charge is greater than or equal to a first threshold and less than or equal to a second threshold.
The first charge-discharge module 72 is further configured to obtain a measured voltage, a preset limit voltage, and a target voltage of the battery, where the target voltage of the battery is a voltage corresponding to the second threshold; when the preset limit voltage is set to be not less than the target voltage, if the measured voltage of the battery is detected to rise to the preset limit voltage, the battery is stopped to be charged.
The first charge-discharge module 72 is further configured to obtain a measured voltage, a preset limit voltage, and a target voltage of the battery, where the target voltage of the battery is a voltage corresponding to a second threshold at the initial state of charge, and the second threshold is an upper limit of the first numerical range; when the preset limit voltage is set to be smaller than the target voltage, if the actual measurement voltage of the battery is detected to rise to the preset limit voltage, the battery is stopped to be charged, and after the actual measurement voltage of the battery is detected to rise to the preset limit voltage, the battery is charged again when the actual measurement voltage of the battery is detected to fall to be smaller than the preset limit voltage.
The first charge-discharge module 72 is further configured to stop charging the battery if the measured voltage of the battery is detected to be greater than the preset limit voltage until the measured voltage is greater than the target voltage.
The second charge-discharge module 74 is further configured to charge the battery in a normal charge mode if the measured state of charge is smaller than the first threshold, and charge the battery in an online charge mode until the measured state of charge is equal to the first threshold, where the normal charge mode is a mode in which a vehicle-mounted charger charges the battery, and the battery does not discharge.
The second charge-discharge module 74 is further configured to stop charging and discharging the battery in the online charge mode if the measured state of charge is greater than the second threshold.
The device further comprises a third obtaining module 75, configured to obtain a preset return difference of the state of charge; and reducing or increasing the first threshold value and the second threshold value by a preset back difference so as to adjust the first numerical range and the second numerical range.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-mentioned division of the functional units and modules is illustrated, and in practical applications, the above-mentioned function distribution may be performed by different functional units and modules according to needs, that is, the internal structure of the apparatus is divided into different functional units or modules, so as to perform all or part of the functions described above. Each functional unit and module in the embodiments may be integrated in one processing unit, or each unit may exist alone physically, or two or more units are integrated in one unit, and the integrated unit may be implemented in a form of hardware, or in a form of software functional unit. In addition, specific names of the functional units and modules are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working processes of the units and modules in the system may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
As shown in fig. 8, the present embodiment further provides a terminal device 200, which includes a memory 21, a processor 22, and a computer program 23 stored in the memory 21 and operable on the processor 22, and when the processor 22 executes the computer program 23, the charging method of the vehicle of the foregoing embodiments is implemented.
The Processor 22 may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic device, discrete hardware component, etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The memory 21 may be an internal storage unit of the terminal device 200. The memory 21 may also be an external storage device of the terminal device 200, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card) and the like provided on the terminal device 200. Further, the memory 21 may also include both an internal storage unit of the terminal device 200 and an external storage device. The memory 21 is used to store computer programs and other programs and data required by the terminal device 200. The memory 21 may also be used to temporarily store data that has been output or is to be output.
The embodiment of the application also provides a computer readable storage medium, which stores a computer program, and the computer program is executed by a processor to realize the charging method of the vehicle of the above embodiments.
The embodiment of the application provides a computer program product, and when the computer program product runs on a mobile terminal, the mobile terminal is enabled to execute the computer program product to realize the charging method of the vehicle of the above embodiments.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, all or part of the flow in the method of the embodiments described above can be implemented by a computer program, which can be stored in a computer readable storage medium and can implement the steps of the embodiments of the methods described above when the computer program is executed by a processor. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer-readable storage medium may include at least: any entity or device capable of carrying computer program code to a photographing apparatus/terminal apparatus, a recording medium, computer memory, read-only memory (ROM), Random Access Memory (RAM), electrical carrier wave signals, telecommunication signals, and software distribution medium. Such as a usb-disk, a removable hard disk, a magnetic or optical disk, etc. In certain jurisdictions, computer-readable storage media may not be an electrical carrier signal or a telecommunications signal in accordance with legislative and proprietary practices.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to the related descriptions of other embodiments for parts that are not described or illustrated in a certain embodiment.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
Units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiments of the present application.
The above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.

Claims (10)

1. A method of charging a vehicle, the method comprising:
acquiring an initial state of charge of the battery;
if the initial state of charge is in a first numerical range, charging and discharging the battery in an online charging mode, wherein the first numerical range is the range of the state of charge when the battery is safely charged, and the online charging mode is that the battery discharges when the battery is charged;
acquiring an actually measured charge state of the battery when the battery is charged and discharged in an online charging mode;
and if the actually measured charge state is in a second numerical range, stopping charging and discharging the battery in an online charging mode, wherein the second numerical range is the range of the charge state when the battery is overcharged or overdischarged.
2. The charging method of claim 1, wherein said charging and discharging said battery in an online charging mode if said initial state of charge is within a first range of values comprises:
and if the initial state of charge is greater than or equal to a first threshold and less than or equal to a second threshold, charging and discharging the battery in an online charging mode.
3. The charging method according to claim 2, wherein the charging and discharging the battery in an online charging mode further comprises:
acquiring the measured voltage, the preset limit voltage and the target voltage of the battery, wherein the target voltage of the battery is the voltage corresponding to the second threshold;
and when the preset limit voltage is not less than the target voltage, if the measured voltage of the battery is detected to rise to the preset limit voltage, the battery is stopped to be charged.
4. The charging method according to claim 1, wherein the charging and discharging the battery in an online charging mode comprises:
acquiring the measured voltage, the preset limit voltage and the target voltage of the battery, wherein the target voltage of the battery is the voltage corresponding to a second threshold value of the initial state of charge, and the second threshold value is the upper limit value of the first numerical range;
when the preset limit voltage is set to be smaller than the target voltage, if the actual measurement voltage of the battery is detected to rise to the preset limit voltage, the battery is stopped to be charged, and after the actual measurement voltage of the battery is detected to rise to the preset limit voltage, the actual measurement voltage of the battery is detected to fall to be smaller than the preset limit voltage, and the battery is charged again.
5. The charging method of claim 4, wherein charging and discharging the battery in an online charging mode further comprises:
and if the measured voltage of the battery is detected to be greater than the preset limit voltage, stopping charging the battery until the measured voltage is greater than the target voltage.
6. The charging method of claim 1, wherein stopping charging and discharging the battery in an online charging mode if the measured state of charge is within a second range of values comprises:
and if the actual measurement state of charge is smaller than a first threshold value, charging the battery in a normal charging mode, and charging the battery in an online charging mode when the actual measurement state of charge is equal to the first threshold value, wherein the normal charging mode is that a vehicle-mounted charger charges the battery, and the battery does not discharge.
7. The method of charging of claim 1, wherein if the measured state of charge is within a second range of values, stopping charging and discharging the battery in an online charging mode, further comprising:
and if the actually measured charge state is larger than a second threshold value, stopping charging and discharging the battery in an online charging mode.
8. The charging method according to claim 1, wherein the first range of values includes a range of values greater than or equal to a first threshold and less than or equal to a second threshold, and the second range of values includes a range of values less than the first threshold or greater than the second threshold, and the method further includes:
acquiring a preset return difference of the state of charge;
and decreasing or increasing the preset back difference between the first threshold and the second threshold to adjust the first numerical range and the second numerical range.
9. A charging device for a vehicle, characterized in that the device comprises:
the first acquisition module is used for acquiring the initial charge state of the battery;
the first charging and discharging module is used for charging and discharging the battery in an online charging mode if the initial charge state is in a first numerical range, wherein the first numerical range is the range of the charge state when the battery is safely charged, and the online charging mode is that the battery discharges when the battery is charged;
the second acquisition module is used for acquiring the actually measured charge state of the battery when the battery is charged and discharged in an online charging mode;
and the second charging and discharging module is used for stopping charging and discharging the battery in an online charging mode if the actually measured charge state is in a second numerical range, wherein the second numerical range is the charge state range when the battery is overcharged or overdischarged.
10. An electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, the processor implementing a charging method of a vehicle according to any one of claims 1 to 8 when executing the computer program.
CN202210275916.2A 2022-03-21 2022-03-21 Vehicle charging method, system, electronic device and readable storage medium Active CN114604130B (en)

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