CN116316935A - Power management method and vehicle auxiliary power supply - Google Patents

Power management method and vehicle auxiliary power supply Download PDF

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Publication number
CN116316935A
CN116316935A CN202211104994.2A CN202211104994A CN116316935A CN 116316935 A CN116316935 A CN 116316935A CN 202211104994 A CN202211104994 A CN 202211104994A CN 116316935 A CN116316935 A CN 116316935A
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China
Prior art keywords
battery
vehicle
management system
auxiliary
mounted lead
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Pending
Application number
CN202211104994.2A
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Chinese (zh)
Inventor
万亚坤
嵇雷
郑朝阳
赵忠远
刘双合
马浩天
钟兆鹏
武昆
宋昱科
牛琪玉
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Fengfan Co Ltd
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Fengfan Co Ltd
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Priority to CN202211104994.2A priority Critical patent/CN116316935A/en
Publication of CN116316935A publication Critical patent/CN116316935A/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
    • B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
    • B60R16/03—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for supply of electrical power to vehicle subsystems or for
    • B60R16/033—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for supply of electrical power to vehicle subsystems or for characterised by the use of electrical cells or batteries
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/00306—Overdischarge protection
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
    • 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

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Secondary Cells (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The application is applicable to the technical field of power supply, and provides a power management method and an auxiliary power supply for a vehicle. The method is applied to an auxiliary power supply of a vehicle, wherein the auxiliary power supply of the vehicle comprises a battery management system and an auxiliary battery; the method comprises the following steps: the battery management system collects bus voltage and bus current in real time; after the auxiliary battery and the vehicle-mounted lead-acid battery are started, the battery management system controls the charging states of the auxiliary battery and the vehicle-mounted lead-acid battery according to the magnitude of the bus voltage and the direction of the bus current; the battery management system controls the discharge state of the auxiliary battery according to the magnitude of the bus voltage and/or the direction and magnitude of the bus current. The power management method can avoid excessive use of the vehicle-mounted lead-acid battery, slow down the capacity attenuation speed of the vehicle-mounted lead-acid battery and prolong the service life of the vehicle-mounted lead-acid battery.

Description

Power management method and vehicle auxiliary power supply
Technical Field
The application relates to the technical field of power supply, in particular to a power management method and an auxiliary power supply for a vehicle.
Background
Drivers of coach/freight vehicles often rest and live in the middle or service areas, in order to improve comfort, the vehicles are additionally provided with electric appliances such as parking air conditioners, parking heaters and lighting equipment, and more electric loads and ever-increasing electricity requirements lead to frequent use of the vehicle-mounted lead-acid battery for feeding, so that the capacity of the vehicle-mounted lead-acid battery is fast in attenuation and low in charging efficiency, and meanwhile the vehicles cannot be started normally.
Therefore, a power management method and a vehicle auxiliary power supply are urgently needed to manage and control the charge and discharge states and the discharge depth of the vehicle-mounted lead-acid battery so as to slow down the capacity attenuation speed of the vehicle-mounted lead-acid battery and prolong the service life of the vehicle-mounted lead-acid battery.
Disclosure of Invention
In order to overcome the problems in the related art, the embodiment of the application provides a power management method and a vehicle auxiliary power supply, so as to solve the technical problems that the vehicle-mounted lead-acid battery is used for feeding due to the continuously increased power demand, and further the capacity of the vehicle-mounted lead-acid battery is fast in attenuation and low in charging efficiency, and the vehicle cannot be started normally.
The application is realized by the following technical scheme:
in a first aspect, an embodiment of the present application provides a power management method applied to a vehicle auxiliary power supply, where the vehicle auxiliary power supply includes: a battery management system and an auxiliary battery; the battery management system is used for controlling the auxiliary battery and the vehicle-mounted lead-acid battery; the method comprises the following steps: the battery management system collects bus voltage and bus current in real time; after the auxiliary battery and the vehicle-mounted lead-acid battery are started, the battery management system controls the charging states of the auxiliary battery and the vehicle-mounted lead-acid battery according to the magnitude of the bus voltage and the direction of the bus current; the battery management system controls the discharge state of the auxiliary battery according to the magnitude of the bus voltage and/or the direction and magnitude of the bus current.
In one possible implementation manner of the first aspect, the battery management system controls the charging states of the auxiliary battery and the vehicle-mounted lead-acid battery according to the magnitude of the bus voltage and the direction of the bus current, and includes: when the battery management system detects that the direction of the bus current is positive and the bus voltage is in a first voltage threshold range, controlling the discharging voltage of the auxiliary battery to change in real time along with the bus voltage, and controlling the vehicle generator to charge the vehicle-mounted lead-acid battery; when the battery management system detects that the charging voltage of the vehicle-mounted lead-acid battery is in the second voltage threshold range and the charging current of the vehicle-mounted lead-acid battery is smaller than the second current threshold, the vehicle generator is controlled to charge the auxiliary battery according to a preset auxiliary battery charging threshold table.
In a possible implementation manner of the first aspect, the battery management system controls a discharge state of the auxiliary battery according to a magnitude of a bus voltage and/or a direction and a magnitude of a bus current, including: and when the battery management system detects that the direction of the bus current is negative and the bus current is larger than a third current threshold and the bus voltage is smaller than or equal to the third voltage threshold, the auxiliary battery is controlled to discharge so as to enable the auxiliary battery to participate in the whole vehicle power supply.
In a possible implementation manner of the first aspect, the battery management system controls a discharge state of the auxiliary battery according to a magnitude of a bus voltage and/or a direction and a magnitude of a bus current, including: when the battery management system detects that the direction of the bus current is negative and the bus current is in the life electricity consumption current threshold range, the auxiliary battery is controlled to discharge, so that the auxiliary battery participates in power supply of life electric appliances.
In a possible implementation manner of the first aspect, the power management method further includes: when the battery management system detects that the state of charge of the auxiliary battery is smaller than a first state of charge threshold, controlling the auxiliary battery to stop discharging, and controlling the vehicle-mounted lead-acid battery to discharge; when the battery management system detects that the state of charge of the vehicle-mounted lead-acid battery is smaller than a second state of charge threshold, alarm information is sent out, and when the depth of discharge of the vehicle-mounted lead-acid battery reaches a preset depth of discharge threshold, the vehicle-mounted lead-acid battery is controlled to stop discharging; wherein the first state of charge threshold is equal to the second state of charge threshold.
In a possible implementation manner of the first aspect, when the battery management system controls the vehicle generator to charge the vehicle-mounted lead-acid battery, the power management method further includes: when the battery management system detects that the ambient temperature is smaller than a preset temperature threshold, the charging voltage of the vehicle generator to the vehicle-mounted lead-acid battery is controlled according to the ambient temperature.
In a possible implementation manner of the first aspect, the power management method further includes: when the battery management system detects that the bus current is larger than a first starting current threshold value or the bus voltage is in a first starting voltage threshold range, the auxiliary battery is controlled to be started; and when the battery management system detects that the direction of the bus current is negative and the bus current is larger than a second starting current threshold value and the bus voltage is in a second starting voltage threshold range, the vehicle-mounted lead-acid battery is controlled to start.
In a possible implementation manner of the first aspect, the power management method further includes: the battery management system detects the internal resistance of the vehicle-mounted lead-acid battery and the active matter vulcanization state of the vehicle-mounted lead-acid battery in real time; when the battery management system detects that the internal resistance of the vehicle-mounted lead-acid battery is smaller than a preset internal resistance threshold value and the vulcanization state of the active matters of the vehicle-mounted lead-acid battery reaches the preset state, the vehicle-mounted lead-acid battery is charged in a three-stage mode, and therefore vulcanization of the active matters of the vehicle-mounted lead-acid battery is eliminated.
In a second aspect, embodiments of the present application provide a vehicle auxiliary power supply for implementing the power management method according to any one of the first aspects; the vehicle auxiliary power supply includes: a battery management system and an auxiliary battery; the first end of the battery management system is connected with the anode of the auxiliary battery, the second end of the battery management system is connected with the cathode of the auxiliary battery, and the battery management system is used for controlling the charging state and the discharging state of the auxiliary battery; the first end of the battery management system is also connected with the anode of the vehicle-mounted lead-acid battery, the second end of the battery management system is also connected with the cathode of the vehicle-mounted lead-acid battery, and the battery management system is used for controlling the charging state and the discharging state of the vehicle-mounted lead-acid battery.
In one possible implementation manner of the second aspect, the vehicle auxiliary power supply further includes: a housing; the shell comprises a main shell and an end cover; the main shell is used for accommodating and fixing the battery management system and the auxiliary battery; an end cap is coupled to an end of the main housing.
It will be appreciated that the advantages of the second aspect may be found in the relevant description of the first aspect, and will not be described in detail herein.
The power management method and the vehicle auxiliary power supply provided by the embodiment of the application are applied to the vehicle auxiliary power supply, and the vehicle auxiliary power supply comprises the following steps: the method comprises the steps that bus voltage and bus current are collected in real time through the battery management system, after the auxiliary battery and the vehicle-mounted lead-acid battery are started, the battery management system controls the charging states of the auxiliary battery and the vehicle-mounted lead-acid battery according to the magnitude of the bus voltage and the direction of the bus current, and the battery management system controls the discharging states of the auxiliary battery according to the magnitude of the bus voltage and/or the direction and the magnitude of the bus current, the battery management system is utilized to control the charging and discharging states and the discharging depth of the vehicle-mounted lead-acid battery according to the bus voltage and the bus current, and meanwhile the auxiliary battery is utilized to assist the vehicle-mounted lead-acid battery, so that the excessive use of the vehicle-mounted lead-acid battery can be avoided, the capacity attenuation speed of the vehicle-mounted lead-acid battery is slowed down, and the service life of the vehicle-mounted lead-acid battery is prolonged.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required for the embodiments or the description of the prior art will be briefly described 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 is a schematic view of an application scenario provided in an embodiment of the present application;
FIG. 2 is a flow chart of a power management method according to an embodiment of the present disclosure;
FIG. 3 is a flow chart of a power management method according to an embodiment of the present disclosure;
fig. 4 is a schematic circuit connection diagram of an auxiliary power supply for a vehicle according to an embodiment of the present application.
Detailed Description
The present application will be more clearly described with reference to the following specific examples. The following examples will assist those skilled in the art in further understanding the function of the present application, but are not intended to limit the present application in any way. It should be noted that variations and modifications could be made by those skilled in the art without departing from the spirit of the present application. These are all within the scope of the present application.
It should 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.
In the description of this application and the claims that follow, the terms "first," "second," "third," etc. are used merely to distinguish between descriptions and should not be construed to indicate or imply relative importance.
Reference in the specification to "one embodiment" 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 application. Thus, appearances of the phrases "in one embodiment," "in some embodiments," "in other embodiments," and the like in the specification are not necessarily all referring to the same embodiment, but mean "one or more but not all embodiments" unless expressly specified otherwise. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless expressly specified otherwise.
Furthermore, references to "a plurality of" in the examples of this application should be interpreted as two or more.
Drivers of coach/freight vehicles often rest and live in the middle or service areas, in order to improve comfort, the vehicles are additionally provided with electric appliances such as parking air conditioners, parking heaters and lighting equipment, and more electric loads and ever-increasing electricity requirements lead to frequent use of the vehicle-mounted lead-acid battery for feeding, so that the capacity of the vehicle-mounted lead-acid battery is fast in attenuation and low in charging efficiency, and meanwhile the vehicles cannot be started normally.
Therefore, a power management method and a vehicle auxiliary power supply are urgently needed to manage and control the charge and discharge states and the discharge depth of the vehicle-mounted lead-acid battery so as to slow down the capacity attenuation speed of the vehicle-mounted lead-acid battery and prolong the service life of the vehicle-mounted lead-acid battery.
Based on the above-mentioned problems, an embodiment of the present application provides a power management method applied to a vehicle auxiliary power supply, including: the method comprises the steps that bus voltage and bus current are collected in real time through the battery management system, after the auxiliary battery and the vehicle-mounted lead-acid battery are started, the battery management system controls the charging states of the auxiliary battery and the vehicle-mounted lead-acid battery according to the magnitude of the bus voltage and the direction of the bus current, and the battery management system controls the discharging states of the auxiliary battery according to the magnitude of the bus voltage and/or the direction and the magnitude of the bus current, the battery management system is utilized to control the charging and discharging states and the discharging depth of the vehicle-mounted lead-acid battery according to the bus voltage and the bus current, and meanwhile the auxiliary battery is utilized to assist the vehicle-mounted lead-acid battery, so that the excessive use of the vehicle-mounted lead-acid battery can be avoided, the capacity attenuation speed of the vehicle-mounted lead-acid battery is slowed down, and the service life of the vehicle-mounted lead-acid battery is prolonged.
Fig. 1 is a schematic view of an application scenario provided in an embodiment of the present application. As shown in fig. 1, the vehicle auxiliary power supply includes: the battery management system 1 and the auxiliary battery 2, the battery management system 1 is used for controlling the charge and discharge states of the auxiliary battery 2 and the vehicle-mounted lead-acid battery 3.
Fig. 2 is a flowchart of a power management method according to an embodiment of the present application. As shown in fig. 2, the method in the embodiment of the present application is applied to a vehicle auxiliary power supply, and the method may include:
step 101, a battery management system collects bus voltage and bus current in real time.
Optionally, the bus is a vehicle-mounted bus, the battery management system (Battery Management System, abbreviated as BMS) is a hybrid battery management system, and the internal integrated bidirectional direct current converter (bidirectional DC/DC) has the characteristics of high integration, small volume and weight, and adjustable bidirectional current/voltage, can be set according to different current/voltage requirements, and can simultaneously perform information acquisition, charge and discharge management and fault diagnosis on batteries with more than two different voltage platforms, namely, support the mixed use of the batteries with different voltage platforms.
Illustratively, the battery management system collects the magnitude of the bus voltage in real time and the magnitude and direction of the bus current in real time, wherein the battery management system identifies the direction of the bus current through the current diverter.
And 102, after the auxiliary battery and the vehicle-mounted lead-acid battery are started, the battery management system controls the charging states of the auxiliary battery and the vehicle-mounted lead-acid battery according to the magnitude of the bus voltage and the direction of the bus current.
Alternatively, the auxiliary battery may be a lithium iron phosphate battery module, for example, a 24V lithium iron phosphate battery module composed of 8 lithium iron phosphate batteries.
In one possible implementation, referring to fig. 3, in step 102, specifically may include:
and 1021, after the auxiliary battery and the vehicle-mounted lead-acid battery are started, when the battery management system detects that the direction of the bus current is positive and the bus voltage is in a first voltage threshold range, controlling the discharging voltage of the auxiliary battery to change along with the bus voltage in real time, and controlling the vehicle generator to charge the vehicle-mounted lead-acid battery.
For example, when the battery management system detects that the direction of the bus current is positive and the bus voltage is in a first voltage threshold range, for example, the first voltage threshold range may be 27V to 28V, it is confirmed that the vehicle is successfully started at this time, and control is started to charge the vehicle-mounted lead-acid battery and the auxiliary battery. Because the charging efficiency of the vehicle-mounted lead-acid battery is low, the battery management system adjusts the discharging voltage of the auxiliary battery in real time to change along with the bus voltage in real time, and simultaneously controls the vehicle generator to charge the vehicle-mounted lead-acid battery so as to ensure that the vehicle-mounted lead-acid battery is charged with priority.
Step 1022, when the battery management system detects that the charging voltage of the vehicle-mounted lead-acid battery is in the second voltage threshold range and the charging current of the vehicle-mounted lead-acid battery is smaller than the second current threshold, the vehicle generator is controlled to charge the auxiliary battery according to a preset auxiliary battery charging threshold table.
When the battery management system detects that the charging voltage of the vehicle-mounted lead-acid battery is in the second voltage threshold range and the charging current of the vehicle-mounted lead-acid battery is smaller than the second current threshold, the vehicle-mounted lead-acid battery is confirmed to be charged, the battery management system adjusts the voltage of the auxiliary battery, and the vehicle generator is controlled to charge the auxiliary battery according to the auxiliary battery charging threshold table. Wherein the second voltage threshold range may be 28v±0.5V and the second current threshold may be 5A.
Step 103, the battery management system controls the discharging state of the auxiliary battery according to the magnitude of the bus voltage and/or the direction and magnitude of the bus current.
In a possible implementation manner, in step 103, the method specifically may include: and when the battery management system detects that the direction of the bus current is negative and the bus current is larger than a third current threshold and the bus voltage is smaller than or equal to the third voltage threshold, the auxiliary battery is controlled to discharge so as to enable the auxiliary battery to participate in the whole vehicle power supply.
Optionally, when the battery management system detects that the direction of the bus current is positive, and the bus current is greater than the third current threshold, and the bus voltage is less than or equal to the third voltage threshold, it is confirmed that the vehicle electricity demand exceeds the power supply capacity of the vehicle-mounted generator at this time, the battery management system controls to raise the internal voltage of the auxiliary battery to control the auxiliary battery to discharge, so that the auxiliary battery participates in the whole vehicle power supply preferentially, the vehicle-mounted lead-acid battery is prevented from participating in the discharge cycle, and the service life of the vehicle-mounted lead-acid battery is prolonged.
Wherein the third current threshold may be 100A and the third voltage threshold may be 23.5V.
In another possible implementation manner, in step 103, the method specifically may further include: when the battery management system detects that the direction of the bus current is negative and the bus current is in the life electricity consumption current threshold range, the auxiliary battery is controlled to discharge, so that the auxiliary battery participates in power supply of life electric appliances.
When the battery management system detects that the direction of the bus current is negative and the bus current is in the life electricity current threshold range, for example, the life electricity current threshold range can be 0-50A, it is confirmed that the vehicle electricity is the life electricity, the battery management system controls the auxiliary battery to discharge, so that the auxiliary battery is preferentially involved in power supply of the life electric appliance, the vehicle-mounted lead-acid battery is prevented from participating in discharge circulation, and therefore the service life of the vehicle-mounted lead-acid battery is prolonged.
Optionally, the above-mentioned household appliances are for example parking air conditioner, parking heater, lighting device, etc.
In one possible implementation manner, to prevent the auxiliary battery from overdischarging so as to prolong the service life of the auxiliary battery, the power management method provided in the embodiment of the application may further include:
and S1, when the battery management system detects that the charge state of the auxiliary battery is smaller than a first charge state threshold value, controlling the auxiliary battery to stop discharging, and controlling the vehicle-mounted lead-acid battery to discharge.
And S2, when the battery management system detects that the state of charge of the vehicle-mounted lead-acid battery is smaller than a second state of charge threshold, sending out alarm information, and when the depth of discharge of the vehicle-mounted lead-acid battery reaches a preset depth of discharge threshold, controlling the vehicle-mounted lead-acid battery to stop discharging.
Wherein the first state of charge threshold is equal to the second state of charge threshold.
Optionally, when the battery management system detects that the State of Charge (SOC) of the auxiliary battery is smaller than the first State of Charge threshold, it is confirmed that the auxiliary battery is in an overdischarge State at this time, and the battery management system controls the auxiliary battery to stop discharging and controls the vehicle-mounted lead-acid battery to discharge so as to avoid overdischarging the auxiliary battery, thereby prolonging the service life of the auxiliary battery, and simultaneously enabling the vehicle-mounted lead-acid battery to cut in seamlessly to continue to supply power, so as to maintain normal power consumption of the vehicle.
The state of charge may be used to indicate the current remaining charge of the battery, for example, the first state of charge may be 50%.
The battery management system controls the auxiliary battery to stop discharging, controls the vehicle-mounted lead-acid battery to discharge, and when detecting that the charge state of the vehicle-mounted lead-acid battery is smaller than the second charge state threshold value, controls the battery management system to send out alarm information to remind a user that the residual electric quantity of the vehicle-mounted lead-acid battery is lower at the moment, and simultaneously controls the vehicle-mounted lead-acid battery to stop discharging when the discharge depth of the vehicle-mounted lead-acid battery reaches a preset discharge depth threshold value, so that the residual electric quantity enough for starting the vehicle is reserved for the vehicle-mounted lead-acid battery, the next time the vehicle can be started successfully, and the influence of overdischarge of the vehicle-mounted lead-acid battery on the service life of the vehicle-mounted lead-acid battery is avoided.
Specifically, the battery management system detects the state of charge of the on-board lead-acid battery by detecting a change in the bus voltage. The alarm information may be a beep and an indication lamp for display, for example, the battery management system may control to send the alarm information specifically to send the beep for 1 minute, and synchronously control the flashing of a related indication lamp on a dashboard of the vehicle, or control a related Application (APP) installed on the electronic device to send a related alert tone or push message, so as to indicate that the remaining capacity of the vehicle-mounted lead-acid battery is low at this time.
The second state of charge threshold may be 50%, and the preset depth of discharge threshold may be 55%.
In one possible implementation manner, in order to avoid low charging efficiency of the vehicle-mounted lead-acid battery caused by too low temperature of the surrounding environment, the power management method provided by the embodiment of the application may further include:
when the battery management system detects that the ambient temperature is smaller than a preset temperature threshold, the charging voltage of the vehicle generator to the vehicle-mounted lead-acid battery is controlled according to the ambient temperature.
Optionally, when the ambient temperature is lower, the battery management system controls the vehicle generator to charge the vehicle-mounted lead-acid battery, the charging efficiency of the vehicle-mounted lead-acid battery is lower, and the battery management system can improve the charging voltage of the vehicle generator to the vehicle-mounted lead-acid battery according to the ambient temperature so as to improve the charging efficiency of the vehicle-mounted lead-acid battery, thereby avoiding the accelerated aging caused by the fact that the vehicle-mounted lead-acid battery is low in ambient temperature, for example, in winter, the long-time charging efficiency is low, and saturated charging cannot be obtained.
In another possible embodiment, the battery management system also controls the activation of the auxiliary battery and the on-board lead-acid battery. Specifically, the power management method provided in the embodiment of the present application may further include:
and S11, when the battery management system detects that the bus current is larger than a first starting current threshold value or the bus voltage is in a first starting voltage threshold range, controlling the auxiliary battery to start.
And S12, when the battery management system detects that the direction of the bus current is negative and the bus current is larger than a second starting current threshold value and the bus voltage is in a second starting voltage threshold range, the vehicle-mounted lead-acid battery is controlled to start.
Optionally, when the battery management system detects that the direction of the bus current is negative, and the bus current is greater than a preset starting current threshold, and the bus voltage is in a second starting voltage threshold range, it is confirmed that the vehicle is in an engine starting state at the moment, the battery management system adjusts the output voltage in real time to keep the bus voltage stable, and controls the vehicle-mounted lead-acid battery to start with large current.
The first starting current threshold may be 1A, the first starting voltage threshold may be 20V-29V, the second starting current threshold may be 100A, and the second starting voltage threshold may be 20V-29V.
In one possible implementation manner, to reduce the power consumption of the auxiliary battery, the battery management system may control the working state of the auxiliary battery according to the power consumption requirement of the vehicle, and specifically, the power management method provided in the embodiment of the present application may further include:
and when the battery management system detects that the bus current is smaller than the preset current dormancy threshold value, controlling the auxiliary battery to enter a deep dormancy state.
When the battery management system detects that the bus current is smaller than the preset current sleep threshold, for example, the preset current sleep threshold may be 50mA, it is confirmed that no load is on the vehicle at this time, the vehicle is in a locked sleep state, the battery management system controls the auxiliary battery to enter a deep sleep state, and meanwhile controls the self power consumption of the battery management system to be reduced below 1mA, so as to reduce the self power consumption.
Optionally, when the battery management system confirms that no load is on the vehicle to work and the vehicle is in a locked sleep state, the battery management system can also periodically detect the voltage of the vehicle-mounted lead-acid battery, and when the voltage of the vehicle-mounted lead-acid battery is detected to be smaller than a fourth voltage threshold, the auxiliary battery is controlled to be started and is controlled to charge the vehicle-mounted lead-acid battery, so that the situation that the vehicle cannot be started due to feeding is avoided.
In one possible implementation manner, the battery management system may further detect an internal state of the vehicle-mounted lead-acid battery in real time to determine a usage state of the vehicle-mounted lead-acid battery, and specifically, the power management method provided in the embodiment of the present application may further include:
s21, detecting the internal resistance of the vehicle-mounted lead-acid battery and the active matter vulcanization state of the vehicle-mounted lead-acid battery in real time by the battery management system.
S22, when the battery management system detects that the internal resistance of the vehicle-mounted lead-acid battery is smaller than a preset internal resistance threshold value and the vulcanization state of the active matters of the vehicle-mounted lead-acid battery reaches a preset state, the vehicle-mounted lead-acid battery is charged in a three-stage mode, so that the vulcanization of the active matters of the vehicle-mounted lead-acid battery is eliminated.
When the battery management system detects that the internal resistance of the vehicle-mounted lead-acid battery is smaller than a preset internal resistance threshold value and the vulcanization state of the active matters of the vehicle-mounted lead-acid battery reaches the preset state, the vulcanization state of the active matters of the vehicle-mounted lead-acid battery is confirmed, the vulcanization of the active matters of the battery can influence the full charge, the discharge capacity and the charging efficiency of the battery, and the battery management system performs three-section constant current-constant voltage-pulse charging on the vehicle-mounted lead-acid battery under the condition that the normal electricity consumption of the vehicle is not influenced, so that the vulcanization of the active matters of the vehicle-mounted lead-acid battery is eliminated, the active matters are activated, and the service life of the vehicle-mounted lead-acid battery is prolonged.
Optionally, when the battery management system detects that the charging time of the vehicle generator to the vehicle-mounted lead-acid battery is short, and the voltage of the vehicle-mounted lead-acid battery is in a low voltage threshold range within a preset time period, for example, when the battery management system detects that the voltage of the vehicle-mounted lead-acid battery is lower than 25V within 6 continuous hours, it is confirmed that the vehicle-mounted lead-acid battery cannot be fully charged for a long time, and the battery management system can control the auxiliary battery to fully charge the vehicle-mounted lead-acid battery so as to prolong the service life of the vehicle-mounted lead-acid battery.
For example, for a vehicle with braking force recovery on the bus, energy recovery can be performed through the vehicle generator during braking and decelerating of the vehicle, and the bus voltage is higher at the moment, when the battery management system detects that the bus voltage rises and is in a fifth voltage threshold range during braking and decelerating of the vehicle, for example, the fifth voltage threshold range can be 28.5V-30V, the discharging voltage of the auxiliary battery is controlled to change along with the bus voltage in real time, and the recovered energy of the vehicle generator is controlled to charge the vehicle-mounted lead-acid battery.
When the battery management system detects that the charging voltage of the vehicle-mounted lead-acid battery is in the second voltage threshold range and the charging current of the vehicle-mounted lead-acid battery is smaller than the second current threshold, the recovered energy of the vehicle generator is controlled to charge the auxiliary battery.
Optionally, the battery management system may further be provided with a fast-charging module to perform a fast-charging function, so that the vehicle-mounted lead-acid battery and/or the auxiliary battery is rapidly charged by the external motor of the fast-charging module.
For example, when the vehicle supports communication with the battery protocol, the battery management system sends the current battery information of the auxiliary battery and the vehicle-mounted lead-acid battery to the vehicle dashboard through the CAN bus for display, so that a user CAN know the battery information of the auxiliary battery and the vehicle-mounted lead-acid battery in real time. The battery information comprises information such as charge and discharge states of the auxiliary battery and the vehicle-mounted lead-acid battery, residual electric quantity and the like.
When the vehicle does not support communication with the battery protocol, the battery management system transmits current battery information of the auxiliary battery and the vehicle-mounted lead-acid battery to the relevant APP of the electronic equipment of the user through Bluetooth, so that the user can know the battery information of the auxiliary battery and the vehicle-mounted lead-acid battery in real time. The electronic device may be a smart phone of a user or the like.
According to the power management method, the bus voltage and the bus current are collected in real time through the battery management system, after the auxiliary battery and the vehicle-mounted lead-acid battery are started, the battery management system controls the charging states of the auxiliary battery and the vehicle-mounted lead-acid battery according to the magnitude of the bus voltage and the direction of the bus current, and controls the discharging states of the auxiliary battery according to the magnitude of the bus voltage and/or the direction and the magnitude of the bus current, the battery management system is utilized to control the charging and discharging states and the discharging depth of the vehicle-mounted lead-acid battery according to the bus voltage and the bus current, and meanwhile the auxiliary battery is utilized to assist the vehicle-mounted lead-acid battery, so that the excessive use of the vehicle-mounted lead-acid battery can be avoided, the capacity attenuation speed of the vehicle-mounted lead-acid battery is slowed down, and the service life of the vehicle-mounted lead-acid battery is prolonged.
It should be understood that the sequence number of each step in the foregoing embodiment does not mean that the execution sequence of each process should be determined by the function and the internal logic of each process, and should not limit the implementation process of the embodiment of the present application in any way.
Fig. 4 is a schematic circuit connection diagram of an auxiliary power supply for a vehicle according to an embodiment of the present application. As shown in fig. 4, a vehicle auxiliary power supply for implementing a power management method includes: a battery management system and an auxiliary battery.
The first end P1 of the battery management system is connected with the positive electrode of the auxiliary battery, the second end P2 of the battery management system is connected with the negative electrode of the auxiliary battery, and the battery management system is used for controlling the charging state and the discharging state of the auxiliary battery.
The first end P1 of the battery management system is also connected with the anode of the vehicle-mounted lead-acid battery, the second end P2 of the battery management system is also connected with the cathode of the vehicle-mounted lead-acid battery, and the battery management system is used for controlling the charging state and the discharging state of the vehicle-mounted lead-acid battery.
The power management method may be a power management method provided in any embodiment of the present application.
Illustratively, a third terminal P3 of the battery management system is connected to the first terminal Q1 of the auxiliary battery, and the battery management system collects real-time information of the auxiliary battery through the third terminal P3.
Optionally, the vehicle auxiliary power supply may further include a regulating circuit, a shunt, and first and second switches.
The first end D1 of the regulating circuit is connected with the first end P1 of the battery management system, the second end D2 of the regulating circuit is connected with the first end M1 of the vehicle generator, the third end D3 of the regulating circuit is connected with the second end P2 of the battery management system, and the fourth end D4 of the regulating circuit is connected with the fourth end P4 of the battery management system. The battery management system adjusts the output voltage of the battery management system in real time through the adjusting circuit, and the battery management system controls and adjusts the internal voltage of the auxiliary battery through the adjusting circuit.
The first switch is connected between the second end D2 of the adjusting circuit and the first end M1 of the vehicle generator, i.e. the first end of the first switch is connected to the second end D2 of the adjusting circuit, and the second end of the first switch is connected to the first end M1 of the vehicle generator. The first end of the second switch is connected between the second end of the first switch and the first end M1 of the vehicle generator, and the second end of the second switch is connected with the anode of the vehicle-mounted lead-acid battery. During the discharging process of the battery, the battery management system controls the auxiliary battery to be discharged preferentially by opening the second switch, closing the first switch, and controls the vehicle-mounted lead-acid battery to be discharged by opening the first switch. In the process of charging the battery by the vehicle generator, the battery management system controls the vehicle generator to charge the vehicle-mounted lead-acid battery by opening the first switch and closing the second switch, and controls the vehicle generator to charge the auxiliary battery by opening the second switch.
Optionally, the second end M2 of the vehicle generator is connected to the second end N2 of the current divider, and the first end N1 of the current divider is connected to the second end P2 of the battery management system. The battery management system detects the direction of the bus current through the shunt.
It should be noted that, in practical application, the battery management system collects the voltage at the first end N1 of the shunt and the voltage at the second end N2 of the shunt, and when detecting that the voltage at the first end N1 of the shunt is greater than the voltage at the second end N2 of the shunt, defines that the direction of the bus current is negative at this time; when it is detected that the voltage at the first end N1 of the shunt is smaller than the voltage at the second end N2 of the shunt, the direction of the bus current at this time is defined as positive.
In one possible embodiment, the vehicle auxiliary power supply further includes: a housing (not shown). The housing includes a main housing and an end cap. The main housing is used to house and secure the battery management system and auxiliary battery, and to house and secure the conditioning circuit, the current divider, and the first and second switches, with the end cap being coupled to an end of the main housing.
The above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention, and are intended to be included in the scope of the present invention.

Claims (10)

1. A power management method, applied to a vehicle auxiliary power supply, the vehicle auxiliary power supply comprising: a battery management system and an auxiliary battery; the battery management system is used for controlling the auxiliary battery and the vehicle-mounted lead-acid battery; the method comprises the following steps:
the battery management system collects bus voltage and bus current in real time;
after the auxiliary battery and the vehicle-mounted lead-acid battery are started, the battery management system controls the charging states of the auxiliary battery and the vehicle-mounted lead-acid battery according to the magnitude of the bus voltage and the direction of the bus current;
the battery management system controls the discharging state of the auxiliary battery according to the magnitude of the bus voltage and/or the direction and magnitude of the bus current.
2. The power management method according to claim 1, wherein the battery management system controls the states of charge of the auxiliary battery and the in-vehicle lead-acid battery according to the magnitude of the bus voltage and the direction of the bus current, comprising:
when the battery management system detects that the direction of the bus current is positive and the bus voltage is in a first voltage threshold range, controlling the discharging voltage of the auxiliary battery to change in real time along with the bus voltage, and controlling a vehicle generator to charge the vehicle-mounted lead-acid battery;
and when the battery management system detects that the charging voltage of the vehicle-mounted lead-acid battery is in a second voltage threshold range and the charging current of the vehicle-mounted lead-acid battery is smaller than a second current threshold, controlling the vehicle generator to charge the auxiliary battery according to a preset auxiliary battery charging threshold table.
3. The power management method according to claim 1, wherein the battery management system controls the discharge state of the auxiliary battery according to the magnitude of the bus voltage and/or the direction and magnitude of the bus current, comprising:
and when the battery management system detects that the direction of the bus current is negative, the bus current is larger than a third current threshold value, and the bus voltage is smaller than or equal to the third voltage threshold value, the auxiliary battery is controlled to discharge, so that the auxiliary battery participates in the whole vehicle power supply.
4. The power management method according to claim 1, wherein the battery management system controls the discharge state of the auxiliary battery according to the magnitude of the bus voltage and/or the direction and magnitude of the bus current, comprising:
and when the battery management system detects that the direction of the bus current is negative and the bus current is in the life electricity consumption current threshold range, the auxiliary battery is controlled to discharge so that the auxiliary battery participates in power supply of the life electric appliance.
5. The power management method according to claim 3 or 4, characterized in that the method further comprises:
when the battery management system detects that the state of charge of the auxiliary battery is smaller than a first state of charge threshold, the auxiliary battery is controlled to stop discharging, and the vehicle-mounted lead-acid battery is controlled to discharge;
when the battery management system detects that the state of charge of the vehicle-mounted lead-acid battery is smaller than a second state of charge threshold, sending alarm information, and controlling the vehicle-mounted lead-acid battery to stop discharging when the depth of discharge of the vehicle-mounted lead-acid battery reaches a preset depth of discharge threshold; wherein the first state of charge threshold is equal to a second state of charge threshold.
6. The power management method of claim 2, wherein when the battery management system controls a vehicle generator to charge the on-board lead-acid battery, the method further comprises:
and when the battery management system detects that the ambient temperature is smaller than a preset temperature threshold, controlling the charging voltage of the vehicle generator to the vehicle-mounted lead-acid battery according to the ambient temperature.
7. The method of power management according to claim 1, wherein the method further comprises:
the battery management system controls the auxiliary battery to start when detecting that the bus current is greater than a first starting current threshold value or the bus voltage is in a first starting voltage threshold range;
and when the battery management system detects that the direction of the bus current is negative, the bus current is larger than a second starting current threshold value, and the bus voltage is in a second starting voltage threshold range, the vehicle-mounted lead-acid battery is controlled to be started.
8. The method of power management according to claim 1, wherein the method further comprises:
the battery management system detects the internal resistance of the vehicle-mounted lead-acid battery and the active matter vulcanization state of the vehicle-mounted lead-acid battery in real time;
when the battery management system detects that the internal resistance of the vehicle-mounted lead-acid battery is smaller than a preset internal resistance threshold value and the vulcanization state of the active matters of the vehicle-mounted lead-acid battery reaches a preset state, the vehicle-mounted lead-acid battery is charged in a three-stage mode, so that the vulcanization of the active matters of the vehicle-mounted lead-acid battery is eliminated.
9. A vehicle auxiliary power supply for implementing the power management method according to any one of claims 1 to 8; the vehicle auxiliary power supply includes: a battery management system and an auxiliary battery;
the first end of the battery management system is connected with the positive electrode of the auxiliary battery, the second end of the battery management system is connected with the negative electrode of the auxiliary battery, and the battery management system is used for controlling the charging state and the discharging state of the auxiliary battery;
the first end of the battery management system is also connected with the anode of the vehicle-mounted lead-acid battery, the second end of the battery management system is also connected with the cathode of the vehicle-mounted lead-acid battery, and the battery management system is used for controlling the charging state and the discharging state of the vehicle-mounted lead-acid battery.
10. The vehicle auxiliary power supply according to claim 9, characterized by further comprising: a housing;
the housing comprises a main housing and an end cover; the main housing is used for accommodating and fixing the battery management system and the auxiliary battery; the end cap is coupled to an end of the main housing.
CN202211104994.2A 2022-09-09 2022-09-09 Power management method and vehicle auxiliary power supply Pending CN116316935A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202211104994.2A CN116316935A (en) 2022-09-09 2022-09-09 Power management method and vehicle auxiliary power supply

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202211104994.2A CN116316935A (en) 2022-09-09 2022-09-09 Power management method and vehicle auxiliary power supply

Publications (1)

Publication Number Publication Date
CN116316935A true CN116316935A (en) 2023-06-23

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Family Applications (1)

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CN202211104994.2A Pending CN116316935A (en) 2022-09-09 2022-09-09 Power management method and vehicle auxiliary power supply

Country Status (1)

Country Link
CN (1) CN116316935A (en)

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