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CN114448053A - Charging control method and device for battery system, electronic equipment and storage medium - Google Patents

Charging control method and device for battery system, electronic equipment and storage medium Download PDF

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Publication number
CN114448053A
CN114448053A CN202210121628.1A CN202210121628A CN114448053A CN 114448053 A CN114448053 A CN 114448053A CN 202210121628 A CN202210121628 A CN 202210121628A CN 114448053 A CN114448053 A CN 114448053A
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voltage
cut
charge
value
target
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Inventor
何佳星
何志超
王垒
吕喆
钱昊
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Beijing Hyperstrong Technology Co Ltd
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Beijing Hyperstrong Technology Co Ltd
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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
    • H02J7/00032—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by data exchange
    • H02J7/00036—Charger exchanging data with battery
    • 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
    • H02J7/0014—Circuits for equalisation of charge between 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
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/00302—Overcharge 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
    • 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
    • H02J7/007182—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery voltage
    • 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
    • H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
    • H02J7/04—Regulation of charging current or voltage

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

Abstract

The application provides a charging control method and device of a battery system, an electronic device and a storage medium. The method comprises the steps of acquiring a plurality of single voltages in the battery system in real time in the process of charging the battery system, acquiring a parameter value of the battery system when a target voltage is larger than or equal to a preset charge cut-off voltage minimum value, determining a target charge cut-off voltage according to the parameter value, the preset charge cut-off voltage maximum value and the charge cut-off voltage minimum value, and controlling the battery system to charge according to the target charge cut-off voltage. In the method, when the target voltage is greater than or equal to the preset minimum value of the charge cut-off voltage, the parameter value of the battery system is obtained in real time, and at the moment, the target charge cut-off voltage is dynamically determined by utilizing the parameter value and combining the preset maximum value and the preset minimum value of the charge cut-off voltage, so that the difference among the battery cores in the battery system can be reduced, the consistency among the battery cores is improved, and the system capacity can be improved to the maximum extent.

Description

Charging control method and device for battery system, electronic equipment and storage medium
Technical Field
The present disclosure relates to the field of battery systems, and in particular, to a charging control method and apparatus for a battery system, an electronic device, and a storage medium.
Background
At present, a power battery system of a vehicle is generally formed by connecting a plurality of batteries in series and in parallel, and the whole power system cannot fully exert the capacity of the power system due to the consistency difference between battery cores or modules of the batteries. Therefore, the effective charging control strategy is applied to the charging process of the power system, and has important significance for improving the capacity of the system and increasing the mileage of the whole vehicle.
In a conventional charge control method, charge control is generally performed using current control. For example, when the voltage of the battery system reaches the charge cut-off voltage and the current charging current is greater than the preset current threshold, the current charging current is reduced according to the current adjustment parameter to obtain the target current, and the battery system is charged according to the target current. In the method, when the battery is charged and is not fully charged, the power is limited for a plurality of times, the charging current is controlled, and the battery is charged to the charging cut-off voltage for a plurality of times so as to achieve the state of full charge as much as possible.
However, the existing charging control method cannot reduce the difference between the voltages of the battery cells, does not consider the problem of the balance between different charging cut-off voltages and the battery cells, and cannot improve the capacity of the battery system to the maximum extent.
Disclosure of Invention
The application provides a charging control method and device of a battery system, electronic equipment and a storage medium, which are used for solving the problems that in the existing charging control method of the battery system, the difference between the voltages of battery monomers cannot be reduced, and the capacity of a power system cannot be improved to the greatest extent.
In a first aspect, the present application provides a charging control method for a battery system, including:
and acquiring a plurality of cell voltages in the battery system in real time.
And when the target voltage is greater than or equal to the preset minimum value of the charge cut-off voltage, acquiring a parameter value of the battery system. The target voltage includes a maximum cell voltage, a minimum cell voltage, or an average voltage of the plurality of cell voltages.
And determining the target charge cut-off voltage according to the parameter value, the preset maximum charge cut-off voltage value and the minimum charge cut-off voltage value.
And controlling the battery system to charge according to the target charge cut-off voltage.
Optionally, determining the target charge cut-off voltage according to the parameter value, the preset maximum charge cut-off voltage value and the minimum charge cut-off voltage value includes:
and determining the target charging cut-off voltage according to the parameter value, the preset threshold corresponding to the parameter, the maximum value of the charging cut-off voltage and the minimum value of the charging cut-off voltage.
Optionally, the parameter comprises a system pressure differential.
Determining a target charge cut-off voltage according to the parameter value, a preset threshold value corresponding to the parameter, a maximum charge cut-off voltage value and a minimum charge cut-off voltage value, and the method comprises the following steps:
determining a target charge cutoff voltage according to equation (1):
vcut＝Vmin+(Vmax-Vmin)*Δv/ΔVth (1)
wherein v iscutIndicates a target charge cut-off voltage, VmaxRepresents the maximum value of charge cut-off voltage, VminRepresents the minimum value of charge cut-off voltage, Δ V represents the system voltage difference, Δ VthRepresenting a preset threshold value corresponding to the system pressure difference.
Optionally, the parameter comprises a system pressure differential.
Determining a target charge cut-off voltage according to the parameter value, a preset threshold value corresponding to the parameter, a maximum charge cut-off voltage value and a minimum charge cut-off voltage value, and the method comprises the following steps:
determining a target charge cutoff voltage according to equation (2):
Figure BDA0003498750260000024
wherein v iscutIndicates a target charge cut-off voltage, VmaxRepresents the maximum value of charge cut-off voltage, VminRepresents the minimum value of charge cut-off voltage, Δ V represents the system voltage difference, Δ VthRepresenting a preset threshold value corresponding to the system pressure difference.
Optionally, the parameter comprises a system average voltage.
Determining a target charge cut-off voltage according to the parameter value, a preset threshold value corresponding to the parameter, a maximum charge cut-off voltage value and a minimum charge cut-off voltage value, and the method comprises the following steps:
determining a target charge cutoff voltage according to equation (3):
Figure BDA0003498750260000021
wherein v iscutIndicates a target charge cut-off voltage, VmaxRepresents the maximum value of charge cut-off voltage, VminIndicates the minimum value of the charge cut-off voltage,
Figure BDA0003498750260000022
which represents the average voltage of the system,
Figure BDA0003498750260000023
and the preset threshold value corresponding to the average voltage of the system is represented.
Optionally, the parameter comprises a system average voltage.
Determining a target charge cut-off voltage according to the parameter value, a preset threshold value corresponding to the parameter, a maximum charge cut-off voltage value and a minimum charge cut-off voltage value, and the method comprises the following steps:
determining a target charge cutoff voltage according to equation (4):
Figure BDA0003498750260000031
wherein v iscutIndicates a target charge cut-off voltage, VmaxRepresents the maximum value of charge cut-off voltage, VminRepresents the minimum value of the charge cut-off voltage,
Figure BDA0003498750260000032
which represents the average voltage of the system,
Figure BDA0003498750260000033
and the preset threshold value corresponding to the average voltage of the system is represented.
In a second aspect, the present application provides a charge control device of a battery system, comprising:
the acquisition module is used for acquiring a plurality of cell voltages in the battery system in real time.
The obtaining module is further used for obtaining a parameter value of the battery system when the target voltage is larger than or equal to a preset minimum value of the charge cut-off voltage. The target voltage includes a maximum cell voltage, a minimum cell voltage, or an average voltage of the plurality of cell voltages.
And the determining module is used for determining the target charging cut-off voltage according to the parameter value, the preset maximum value of the charging cut-off voltage and the preset minimum value of the charging cut-off voltage.
And the control module is used for controlling the battery system to charge according to the target charge cut-off voltage.
Optionally, the determining module is specifically configured to:
and determining the target charging cut-off voltage according to the parameter value, the preset threshold corresponding to the parameter, the maximum value of the charging cut-off voltage and the minimum value of the charging cut-off voltage.
Optionally, the parameter comprises a system pressure differential.
The determining module is specifically configured to:
determining a target charge cutoff voltage according to equation (1):
vcut＝Vmin+(Vmax-Vmin)*Δv/ΔVth (1)
wherein v iscutIndicates a target charge cut-off voltage, VmaxRepresents the maximum value of charge cut-off voltage, VminRepresents the minimum value of charge cut-off voltage, Δ V represents the system voltage difference, Δ VthRepresenting a preset threshold value corresponding to the system pressure difference.
Optionally, the parameter comprises a system pressure differential.
The determining module is specifically configured to:
determining a target charge cutoff voltage according to equation (2):
Figure BDA0003498750260000034
wherein v iscutIndicates a target charge cut-off voltage, VmaxRepresents the maximum value of charge cut-off voltage, VminRepresents the minimum value of charge cut-off voltage, Δ V represents the system voltage difference, Δ VthRepresenting a preset threshold value corresponding to the system pressure difference.
Optionally, the parameter comprises a system average voltage.
The determining module is specifically configured to:
determining a target charge cutoff voltage according to equation (3):
Figure BDA0003498750260000041
wherein v iscutIndicates a target charge cut-off voltage, VmaxRepresents the maximum value of charge cut-off voltage, VminRepresents the minimum value of the charge cut-off voltage,
Figure BDA0003498750260000042
which represents the average voltage of the system,
Figure BDA0003498750260000043
and the preset threshold value corresponding to the average voltage of the system is represented.
Optionally, the parameter comprises a system average voltage.
The determining module is specifically configured to:
determining a target charge cutoff voltage according to equation (4):
Figure BDA0003498750260000044
wherein v iscutIndicates a target charge cut-off voltage, VmaxRepresents the maximum value of charge cut-off voltage, VminIndicating charge cutoffThe minimum value of the stop voltage is set,
Figure BDA0003498750260000045
which represents the average voltage of the system,
Figure BDA0003498750260000046
and the preset threshold value corresponding to the average voltage of the system is represented.
In a third aspect, the present application provides an electronic device, comprising: a memory and a processor;
a memory for storing a computer program.
And a processor configured to read the computer program stored in the memory, and execute the charging control method of the battery system according to the first aspect.
In a fourth aspect, the present application provides a readable storage medium, on which a computer program is stored, wherein the computer program stores computer executable instructions, and the computer executable instructions are executed by a processor to implement the charging control method of the battery system as described in the first aspect.
In a fifth aspect, an embodiment of the present application further provides a computer program product, which includes a computer program, and when the computer program is executed by a processor, the charging control method of the battery system of the first aspect is implemented.
According to the charging control method and device of the battery system, the electronic equipment and the storage medium, in the charging process, a plurality of single voltages in the battery system are obtained in real time, when the target voltage is larger than or equal to the minimum value of the preset charging cut-off voltage, the parameter value of the battery system is obtained, the target charging cut-off voltage is determined according to the parameter value, the maximum value of the preset charging cut-off voltage and the minimum value of the charging cut-off voltage, and the battery system is controlled to be charged according to the target charging cut-off voltage. In the method, when the target voltage is greater than or equal to the preset minimum value of the charge cut-off voltage, the parameter value of the battery system is obtained in real time, and at the moment, the target charge cut-off voltage is dynamically determined by utilizing the parameter value and combining the preset maximum value and the preset minimum value of the charge cut-off voltage, so that the difference among the battery cores in the battery system can be reduced, the consistency among the battery cores is improved, and the system capacity can be improved to the maximum extent.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application.
Fig. 1 is a schematic flowchart of a charging control method of a battery system according to an embodiment of the present disclosure;
FIG. 2 is a graph of a system voltage difference versus a target charge cutoff voltage according to an embodiment of the present disclosure;
FIG. 3 is a graph of another system voltage differential versus a target charge cutoff voltage provided by an embodiment of the present application;
fig. 4 is a schematic structural diagram of a charging control device of a battery system according to an embodiment of the present disclosure;
fig. 5 is a schematic structural diagram of an electronic device according to an embodiment of the present application.
With the above figures, there are shown specific embodiments of the present application, which will be described in more detail below. These drawings and written description are not intended to limit the scope of the inventive concepts in any manner, but rather to illustrate the inventive concepts to those skilled in the art by reference to specific embodiments.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.
The technical scheme provided by the embodiment of the application can be used in a charging process of a Battery Management System (BMS) of an electric vehicle, especially in a scene of performing real-time charging control on the Battery system at a charging end. Because the State of Charge (SoC) change rate of the charging start and end is fast in the charging process of the battery system, the charging control is performed on the battery system at the moment, and the effect is more obvious.
Currently, in a battery system of a vehicle, charge control is generally performed using current control. For example, when the current battery voltage reaches the charge cut-off voltage and the current charge current is greater than the preset current threshold, the current charge current is reduced according to the current adjustment parameter to obtain the target current, and the battery is charged according to the target current. However, the charging control method of this method is directed to the entire battery system, and does not consider the consistency difference between each cell or module of the battery system, and the charging cut-off voltage of this method is a certain fixed preset value, and does not consider the problem of the equalization between different charging cut-off voltages and cells, whereas the battery system usually consists of many batteries, and due to the wooden barrel short plate effect, some batteries cannot be fully charged, and one battery may affect the capacity of the entire battery system.
In order to solve the above problems, the present application proposes a charge control method of a battery system. In the charging process, a plurality of monomer voltages in the battery system are obtained in real time, when the target voltage is larger than or equal to the minimum value of the preset charging cut-off voltage, the parameter value of the battery system is obtained, the target charging cut-off voltage is determined according to the parameter value, the maximum value of the preset charging cut-off voltage and the minimum value of the charging cut-off voltage, and the battery system is controlled to be charged according to the target charging cut-off voltage. In the method, when the target voltage is greater than or equal to the minimum value of the preset charge cut-off voltage, the parameter value of the battery system is obtained in real time, and at the moment, the target charge cut-off voltage is dynamically determined by using the parameter value and combining the maximum value and the minimum value of the preset charge cut-off voltage, so that the difference between battery cores in the battery system can be reduced, the consistency between the battery cores is improved, and the system capacity can be further improved to the maximum extent.
The following describes the technical solutions of the present application and how to solve the above technical problems with specific examples. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments. Embodiments of the present application will be described below with reference to the accompanying drawings.
Fig. 1 is a flowchart illustrating a charging control method of a battery system according to an embodiment of the present disclosure, where the charging control method of the battery system may be executed by software and/or a hardware device, for example, the hardware device may be an electronic device, such as a terminal or a server. For example, referring to fig. 1, the charging control method of the battery system may include:
s101, acquiring a plurality of cell voltages in the battery system in real time.
In this step, a plurality of cells may be included in the battery system, and the cell voltage may be understood as a voltage of each cell.
And S102, when the target voltage is larger than or equal to the minimum value of the preset charge cut-off voltage, acquiring a parameter value of the battery system. Wherein the target voltage may include a maximum cell voltage, a minimum cell voltage, or an average voltage of the plurality of cell voltages.
In this step, the target voltage may be any one of the maximum cell voltage, the minimum cell voltage, or the average cell voltage in the battery system. The parameter may be one or more of the combination of system cell voltage difference, system average cell voltage, system cell voltage median, system cell voltage standard deviation, and other variables reflecting voltage consistency between the cells in the battery system, and the specific combination form is not limited herein.
Specifically, the system voltage difference obtained in real time can be adjusted by adjusting a preset minimum value of the charge cut-off voltage. Different charging cut-off voltage minimum values are set, and different real-time system voltage differences can be obtained. For example, when the preset minimum value of the charge cut-off voltage is 3.6V, and when the target voltage is greater than or equal to 3.6V, the system differential pressure obtained in real time is 0.2V; when the preset minimum value of the charge cut-off voltage is 3.65V, and when the target voltage is greater than or equal to 3.65V, the system differential pressure acquired in real time is 0.15V.
S103, determining a target charging cut-off voltage according to the parameter value, the preset maximum charging cut-off voltage value and the preset minimum charging cut-off voltage value.
In this step, the preset maximum charge cut-off voltage value and the preset minimum charge cut-off voltage value may be understood as upper and lower limits of a charge cut-off voltage interval set in the battery system, and may be set according to battery capability, module capability, system capability, characteristics, and the like.
Specifically, the target charge cut-off voltage can be dynamically obtained by adjusting a preset threshold corresponding to the system voltage difference, a preset maximum value of the charge cut-off voltage, and a preset minimum value of the charge cut-off voltage.
Illustratively, the target charge cutoff voltage is determined according to the parameter value, a preset threshold value corresponding to the parameter, a maximum charge cutoff voltage value, and a minimum charge cutoff voltage value.
The preset threshold corresponding to the parameter may be a preset threshold corresponding to one or more variables, that is, a combination of one or more of thresholds such as an extreme voltage difference of a system cell voltage, a system limit average cell voltage, a system limit median of a cell voltage, and a system cell voltage limit standard deviation, and the preset threshold may be set according to a battery cell characteristic. For example, if the selected parameter is the system differential pressure, the preset threshold corresponding to the parameter is the system limit differential pressure; and if the selected parameter is the combination of the system voltage difference and the system monomer voltage standard deviation, the preset threshold corresponding to the parameter is the combination of the system limit voltage difference and the system monomer voltage limit standard deviation.
Specifically, when the target voltage is greater than or equal to the preset minimum charge cut-off voltage, the parameter value of the battery system is acquired in real time, and at this time, the target charge cut-off voltage is dynamically determined by using the parameter value and the preset threshold corresponding to the parameter in combination with the preset maximum value and the preset minimum charge cut-off voltage.
In the scheme, the target charging cut-off voltage is dynamically acquired according to the parameter value, the preset threshold value corresponding to the parameter, the maximum charging cut-off voltage value and the minimum charging cut-off voltage value, wherein the parameter value can reflect the voltage consistency among the single batteries in the battery system, the preset threshold value corresponding to the parameter can be set according to the characteristics of the battery core, the maximum charging cut-off voltage value and the minimum charging cut-off voltage value can be preset according to the battery capacity, the module capacity, the system capacity, the characteristics and the like, the target charging cut-off voltage is dynamically acquired, the difference among the battery cores in the battery system can be reduced, and conditions are created for balancing under the condition that the battery is not abused.
In one possible implementation, the parameter includes a system voltage differential, and the target charge cutoff voltage may be determined according to equation (1):
vcut＝Vmin+(Vmax-Vmin)*Δv/ΔVth (1)
in another possible implementation, when the parameter includes a system differential pressure, the target charge cutoff voltage may also be determined according to equation (2):
Figure BDA0003498750260000081
wherein v iscutIndicates a target charge cut-off voltage, VmaxRepresents the maximum value of charge cut-off voltage, VminRepresents the minimum value of charge cut-off voltage, Δ V represents the system voltage difference, Δ VthRepresenting a preset threshold value corresponding to the system pressure difference.
Specifically, when the parameter is a variable and is the system pressure difference, it can be known from the formula (1) and the formula (2) that the system pressure difference Δ V obtained in real time and the preset threshold Δ V corresponding to the system pressure difference can be usedthA preset maximum value V of the charge cut-off voltagemaxAnd a preset minimum value V of the charge cut-off voltageminTo obtain a target charge cut-off voltage vcut。
For example, in a battery system of a new energy automobile, a preset maximum value V of charge cut-off voltagemax3.65V, preset minimum value V of charge cut-off voltagemin3.6V, and system pressureThreshold value DeltaV corresponding to differencethWhen the battery is charged to the maximum cell voltage of more than or equal to 3.65V, the real-time acquired differential pressure Δ V is 0.2V, and is calculated according to the formula (1) or the formula (2):
vcut＝3.6+(3.65-3.6)*0.2/0.5＝3.62
or vcut＝3.6+(3.65-3.6)*log(0.5+1)(0.2+1)＝3.6225
Wherein, FIG. 2 shows the maximum value V of the preset charge cut-off voltagemax3.65V, preset minimum value V of charge cut-off voltageminThreshold Δ V corresponding to system differential pressure of 3.6VthWhen the voltage is 0.5V, the system voltage difference delta V and the target charging cut-off voltage VcutA graph of the relationship (c).
When the preset threshold value delta V is corresponding to the system pressure differencethA preset maximum value V of the charge cut-off voltagemaxAnd a preset minimum value V of the charge cut-off voltageminWhen the voltage changes, the system voltage difference delta v and the target charging cut-off voltage vcutAnd will vary accordingly. FIG. 3 shows the maximum value V of the charge cut-off voltagemax3.8V, preset minimum value V of charge cut-off voltageminThreshold Δ V corresponding to system differential pressure of 3.65VthAnd when the voltage is 0.5V, the system differential pressure is in a relation graph with the target charge cut-off voltage.
As can be seen from fig. 2 and 3, when the preset threshold Δ V corresponds to the system pressure differencethA preset maximum value V of the charge cut-off voltagemaxAnd a preset minimum value V of the charge cut-off voltageminGiven, different system differential voltages correspond to different target charge cutoff voltages.
In the scheme, the target charging cut-off voltage is a preset threshold value delta V corresponding to the system pressure difference according to the system pressure difference delta V acquired in real timeth、Preset maximum value V of charge cut-off voltagemaxAnd a preset minimum value V of the charge cut-off voltageminThe target charge cutoff voltage at the charging end can thus be dynamically adjusted according to one or several variables. The difference between the battery cores in the battery system can be reduced by the target charging cut-off voltage obtained by the method, so that the system capacity is improved to the maximum extent.
In yet another possible implementation, if the parameter includes a system average voltage, the target charge cutoff voltage may be determined according to equation (3):
Figure BDA0003498750260000091
in yet another possible implementation, if the parameter includes a system average voltage, the target charge cutoff voltage may also be determined according to equation (4):
Figure BDA0003498750260000092
wherein v iscutIndicates a target charge cut-off voltage, VmaxRepresents the maximum value of charge cut-off voltage, VminRepresents the minimum value of the charge cut-off voltage,
Figure BDA0003498750260000093
which represents the average voltage of the system,
Figure BDA0003498750260000094
and the preset threshold value corresponding to the average voltage of the system is represented.
Specifically, when the parameter is a variable and is the system average voltage, it can be known from the formula (3) and the formula (4) that the system average voltage can be obtained in real time
Figure BDA0003498750260000095
Preset threshold corresponding to system average voltage
Figure BDA0003498750260000096
Preset maximum value V of charge cut-off voltagemaxAnd a preset minimum value V of the charge cut-off voltageminTo obtain a target charge cut-off voltage vcut。
In the scheme, the target charging cut-off voltage is obtained according to the average voltage of the system obtained in real time
Figure BDA0003498750260000097
Preset threshold corresponding to system average voltage
Figure BDA0003498750260000098
Preset maximum value V of charge cut-off voltagemaxAnd a preset minimum value V of the charge cut-off voltageminThe target charging cut-off voltage obtained by the method can reduce the difference between the battery cores in the battery system, and further improve the system capacity to the maximum extent.
And S104, controlling the battery system to charge according to the target charge cut-off voltage.
In this step, since the electrical core characteristic, that is, the SoC change rate at the charging start and end is relatively fast, the charging control is performed on the battery system at this time, and the effect is more obvious. Therefore, the charging control of the battery system at the charging end can be realized according to the target charge cutoff voltage.
According to the charging control method of the battery system, the plurality of cell voltages in the battery system are obtained in real time, when the target voltage is larger than or equal to the preset charging cut-off voltage minimum value, the parameter value of the battery system is obtained, the target charging cut-off voltage is determined according to the parameter value, the preset charging cut-off voltage maximum value and the charging cut-off voltage minimum value, and the battery system is controlled to be charged according to the target charging cut-off voltage. In the method, when the target voltage is greater than or equal to the preset minimum value of the charge cut-off voltage, the parameter value of the battery system is obtained in real time, and at the moment, the target charge cut-off voltage is dynamically determined by utilizing the parameter value and combining the preset maximum value and the preset minimum value of the charge cut-off voltage, so that the difference among the battery cores in the battery system can be reduced, the consistency among the battery cores is improved, and the system capacity can be improved to the maximum extent.
Fig. 4 is a schematic structural diagram of a charge control device 40 of a battery system according to an embodiment of the present application, and for example, please refer to fig. 4, the charge control device 40 of the battery system includes:
the obtaining module 401 is configured to obtain a plurality of cell voltages in the battery system in real time.
The obtaining module 401 is further configured to obtain a parameter value of the battery system when the target voltage is greater than or equal to a preset minimum charge cut-off voltage value. The target voltage includes a maximum cell voltage, a minimum cell voltage, or an average voltage of the plurality of cell voltages.
A determining module 402, configured to determine a target charge cut-off voltage according to the parameter value, a preset maximum charge cut-off voltage value, and a preset minimum charge cut-off voltage value.
And a control module 403, configured to control the battery system to charge according to the target charge cut-off voltage.
Optionally, the determining module 402 is specifically configured to:
and determining the target charging cut-off voltage according to the parameter value, the preset threshold corresponding to the parameter, the maximum value of the charging cut-off voltage and the minimum value of the charging cut-off voltage.
Optionally, the parameter comprises a system pressure differential.
The determining module 402 is specifically configured to:
determining a target charge cutoff voltage according to equation (1):
vcut＝Vmin+(Vmax-Vmin)*Δv/ΔVth (1)
wherein v iscutIndicates a target charge cut-off voltage, VmaxRepresents the maximum value of charge cut-off voltage, VminRepresents the minimum value of charge cut-off voltage, Δ V represents the system voltage difference, Δ VthRepresenting a preset threshold value corresponding to the system pressure difference.
Optionally, the parameter comprises a system pressure differential.
The determining module 402 is specifically configured to:
determining a target charge cutoff voltage according to equation (2):
Figure BDA0003498750260000111
wherein v iscutIndicates a target charge cut-off voltage, VmaxRepresents the maximum value of charge cut-off voltage, VminRepresents the minimum value of charge cut-off voltage, Δ V represents the system voltage difference, Δ VthRepresenting a preset threshold value corresponding to the system pressure difference.
Optionally, the parameter comprises a system average voltage.
The determining module 402 is specifically configured to:
determining a target charge cutoff voltage according to equation (3):
Figure BDA0003498750260000112
wherein v iscutIndicates a target charge cut-off voltage, VmaxRepresents the maximum value of charge cut-off voltage, VminRepresents the minimum value of the charge cut-off voltage,
Figure BDA0003498750260000113
which represents the average voltage of the system,
Figure BDA0003498750260000114
and the preset threshold value corresponding to the average voltage of the system is represented.
Optionally, the parameter comprises a system average voltage.
The determining module 402 is specifically configured to:
determining a target charge cutoff voltage according to equation (4):
Figure BDA0003498750260000115
wherein v iscutIndicates a target charge cut-off voltage, VmaxRepresents the maximum value of charge cut-off voltage, VminRepresents the minimum value of the charge cut-off voltage,
Figure BDA0003498750260000116
which represents the average voltage of the system,
Figure BDA0003498750260000117
and the preset threshold value corresponding to the average voltage of the system is represented.
The charge control device 40 of the battery system shown in the embodiment of the present application can execute the technical solution of the charge control method of the battery system in the above embodiment, and its implementation principle and beneficial effect are similar to those of the charge control method of the battery system, and reference may be made to the implementation principle and beneficial effect of the charge control method of the battery system, which are not described herein again.
Fig. 5 is a schematic structural diagram of an electronic device 50 according to an embodiment of the present application, for example, please refer to fig. 5, where the electronic device 50 may include a processor 501 and a memory 502; wherein,
a memory 502 for storing a computer program.
And a processor 501 for reading the computer program stored in the memory 502 and executing the charging control method of the battery system in the above-described embodiment according to the computer program in the memory 502.
Alternatively, the memory 502 may be separate or integrated with the processor 501. When the memory 502 is a separate device from the processor 501, the electronic device 50 may further include: a bus for connecting the memory 502 and the processor 501.
Optionally, this embodiment further includes: a communication interface that may be connected to the processor 501 through a bus. The processor 501 may control the communication interface to implement the above-described functions of acquisition and transmission of the electronic device 50.
For example, in the embodiment of the present application, the electronic device 50 may be a terminal, or may also be a server, and may be specifically configured according to actual needs.
The electronic device 50 shown in the embodiment of the present application can execute the technical solution of the charging control method of the battery system in the above embodiment, and the implementation principle and the beneficial effect of the electronic device are similar to those of the charging control method of the battery system, and reference may be made to the implementation principle and the beneficial effect of the charging control method of the battery system, which are not described herein again.
An embodiment of the present application further provides a computer-readable storage medium, where a computer execution instruction is stored in the computer-readable storage medium, and when a processor executes the computer execution instruction, the technical solution of the charging control method for a battery system in the foregoing embodiment is implemented, and an implementation principle and beneficial effects of the technical solution are similar to an implementation principle and beneficial effects of the charging control method for a battery system, which can be referred to as the implementation principle and beneficial effects of the charging control method for a battery system, and are not described herein again.
The embodiment of the present application further provides a computer program product, which includes a computer program, and when the computer program is executed by a processor, the technical solution of the charging control method for a battery system in the foregoing embodiments is implemented, and the implementation principle and the beneficial effects of the computer program are similar to those of the charging control method for a battery system, which can be referred to as the implementation principle and the beneficial effects of the charging control method for a battery system, and are not described herein again.
In the several embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the modules is merely a logical division, and in actual implementation, there may be other divisions, for example, multiple modules or components may be combined or integrated into another system, or some features may be omitted, or not implemented. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts shown as units may or may not be physical units, may be located in one position, 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 embodiment. In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, or in a form of hardware plus a software functional unit.
The integrated module implemented in the form of a software functional module may be stored in a computer-readable storage medium. The software functional module is stored in a storage medium and includes several instructions to enable a computer device (which may be a personal computer, a server, or a network device) or a processor (processor) to execute some steps of the methods according to the embodiments of the present application.
It should be understood that the Processor may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of a method disclosed in connection with the present invention may be embodied directly in a hardware processor, or in a combination of the hardware and software modules within the processor.
The Memory may include a Random Access Memory (RAM), a Non-Volatile Memory (NVM), for example, at least one disk Memory, and may also be a usb disk, a removable hard disk, a read-only Memory, a magnetic disk or an optical disk.
The bus may be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, an Extended ISA (EISA) bus, or the like. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, the buses in the figures of the present application are not limited to only one bus or one type of bus.
The computer readable storage medium may be any type of volatile or non-volatile Memory device or combination thereof, such as Static Random Access Memory (SRAM), Electrically Erasable Programmable Read-Only Memory (EEPROM), Erasable Programmable Read-Only Memory (EPROM), Programmable Read-Only Memory (PROM), Read-Only Memory (ROM), magnetic Memory, flash Memory, magnetic disk or optical disk. A storage media may be any available media that can be accessed by a general purpose or special purpose computer.
Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting 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 or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.

Claims (10)

1. A charge control method of a battery system, comprising:
acquiring a plurality of cell voltages in a battery system in real time;
when the target voltage is greater than or equal to the preset minimum value of the charge cut-off voltage, acquiring a parameter value of the battery system; the target voltage comprises a maximum cell voltage, a minimum cell voltage, or an average voltage of the plurality of cell voltages;
determining a target charge cut-off voltage according to the parameter value, a preset maximum charge cut-off voltage value and the minimum charge cut-off voltage value;
and controlling the battery system to charge according to the target charge cut-off voltage.
2. The method of claim 1, wherein determining a target charge cutoff voltage based on the parameter value, a preset charge cutoff voltage maximum value, and the charge cutoff voltage minimum value comprises:
and determining the target charging cut-off voltage according to the parameter value, a preset threshold corresponding to the parameter, the maximum charging cut-off voltage value and the minimum charging cut-off voltage value.
3. The method of claim 2, wherein the parameter comprises a system pressure differential;
determining the target charge cut-off voltage according to the parameter value, a preset threshold corresponding to the parameter, the maximum charge cut-off voltage value and the minimum charge cut-off voltage value includes:
determining the target charge cutoff voltage according to equation (1):
vcut＝Vmin+(Vmax-Vmin)*Δv/ΔVth (1)
wherein, v iscutRepresents the target charge cutoff voltage, the VmaxRepresents the maximum value of the charge cut-off voltage, VminRepresents the charge cutoff voltage minimum, the Δ V represents the system differential pressure, the Δ VthAnd the preset threshold value corresponding to the system pressure difference is represented.
4. The method of claim 2, wherein the parameter comprises a system pressure differential;
determining the target charge cut-off voltage according to the parameter value, a preset threshold corresponding to the parameter, the maximum charge cut-off voltage value and the minimum charge cut-off voltage value includes:
determining the target charge cutoff voltage according to equation (2):
Figure FDA0003498750250000011
wherein, v iscutRepresents the target charge cutoff voltage, the VmaxPresentation instrumentMaximum value of charge cut-off voltage, VminRepresents the charge cutoff voltage minimum, the Δ V represents the system differential pressure, the Δ VthAnd the preset threshold value corresponding to the system pressure difference is represented.
5. The method of claim 2, wherein the parameter comprises a system average voltage;
determining the target charge cut-off voltage according to the parameter value, a preset threshold corresponding to the parameter, the maximum charge cut-off voltage value and the minimum charge cut-off voltage value includes:
determining the target charge cutoff voltage according to equation (3):
Figure FDA0003498750250000021
wherein, v iscutRepresents the target charge cutoff voltage, the VmaxRepresents the maximum value of the charge cut-off voltage, VminRepresents the minimum value of the charge cut-off voltage, the
Figure FDA0003498750250000022
Represents the average voltage of the system, the
Figure FDA0003498750250000023
And representing a preset threshold corresponding to the average voltage of the system.
6. The method of claim 2, wherein the parameter comprises a system average voltage;
determining the target charge cut-off voltage according to the parameter value, a preset threshold corresponding to the parameter, the maximum charge cut-off voltage value and the minimum charge cut-off voltage value includes:
determining the target charge cutoff voltage according to equation (4):
Figure FDA0003498750250000024
wherein, v iscutRepresents the target charge cutoff voltage, the VmaxRepresents the maximum value of the charge cut-off voltage, VminRepresents the minimum value of the charge cut-off voltage, the
Figure FDA0003498750250000025
Represents the average voltage of the system, the
Figure FDA0003498750250000026
And the preset threshold value corresponding to the average voltage of the system is represented.
7. A charge control device of a battery system, characterized by comprising:
the acquisition module is used for acquiring a plurality of single voltages in the battery system in real time;
the acquisition module is further used for acquiring a parameter value of the battery system when the target voltage is greater than or equal to a preset minimum value of the charge cut-off voltage; the target voltage comprises a maximum cell voltage, a minimum cell voltage, or an average voltage of the plurality of cell voltages;
the determining module is used for determining a target charging cut-off voltage according to the parameter value, a preset charging cut-off voltage maximum value and the charging cut-off voltage minimum value;
and the control module is used for controlling the battery system to charge according to the target charging cut-off voltage.
8. An electronic device, comprising: a memory and a processor;
the memory for storing a computer program;
the processor is configured to read the computer program stored in the memory, and execute the charging control method of the battery system according to any one of claims 1 to 6 according to the computer program in the memory.
9. A readable storage medium having stored thereon a computer program, characterized in that the computer program has stored therein computer-executable instructions for implementing the charge control method of the battery system according to any one of claims 1 to 6 when executed by a processor.
10. A computer program product comprising a computer program for implementing a charge control method of a battery system according to any one of the preceding claims 1 to 6 when executed by a processor.
CN202210121628.1A 2022-02-09 2022-02-09 Charging control method and device for battery system, electronic equipment and storage medium Pending CN114448053A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115508723A (en) * 2022-10-19 2022-12-23 四川新能源汽车创新中心有限公司 Battery cell charging and discharging cut-off voltage determination method and related device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115508723A (en) * 2022-10-19 2022-12-23 四川新能源汽车创新中心有限公司 Battery cell charging and discharging cut-off voltage determination method and related device
CN115508723B (en) * 2022-10-19 2024-04-16 四川新能源汽车创新中心有限公司 Method and related device for determining charge and discharge cut-off voltage of battery cell

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