CN113619446B - Output control method, control unit and computer readable storage medium - Google Patents

Output control method, control unit and computer readable storage medium Download PDF

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Publication number
CN113619446B
CN113619446B CN202111190386.3A CN202111190386A CN113619446B CN 113619446 B CN113619446 B CN 113619446B CN 202111190386 A CN202111190386 A CN 202111190386A CN 113619446 B CN113619446 B CN 113619446B
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battery
output
model
battery pack
control unit
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CN113619446A (en
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陈勇
熊勇
杨锐
王章磊
刘志娟
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ZTE Corp
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ZTE Corp
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L2240/00—Control parameters of input or output; Target parameters
    • B60L2240/40—Drive Train control parameters
    • B60L2240/54—Drive Train control parameters related to batteries
    • B60L2240/549—Current
    • 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)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Power Engineering (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Secondary Cells (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The invention relates to the technical field of control, and provides an output control method, a control unit and a computer readable storage medium. The method is applied to a control unit, the output end of the control unit is connected to the control end of a switch circuit, the switch circuit is arranged on a power supply output circuit of a battery pack, and the state detection end of the battery pack is connected to the first input end of the control unit. Compared with the method for redesigning and manufacturing the battery suitable for each application scene aiming at different application scenes, the embodiment of the application only needs to set or modify the model of the virtual battery, and then the switch circuit is controlled through software, so that the target output voltage or current meeting the expectation of a user can be output according to the current state parameter of the real battery pack, the limitation of the battery internal battery core characteristic on the use of the battery is eliminated, a new battery does not need to be redesigned and manufactured to adapt to a new application scene, and the cost is effectively reduced.

Description

Output control method, control unit and computer readable storage medium
Technical Field
The present invention relates to the field of control technologies, and in particular, to an output control method, a control unit, and a computer-readable storage medium.
Background
With the development of the electric automobile and the energy storage battery industry, the battery can be applied to various scenes, different requirements are made on the output characteristics of the battery under different scenes, and the output characteristics of the battery are highly related to the physical and chemical characteristics of a battery core adopted in the battery.
Because the output characteristics of the battery are basically fixed after the battery is designed and manufactured, the output characteristics cannot be changed by a user at will, and the universality of the battery is poor, so that the user has to redesign and manufacture batteries with different chemical system types, different voltage levels or different capacities according to different application scenes when facing different application scenes, thereby causing serious resource waste, and greatly increasing the cost for redesigning and manufacturing the batteries.
Disclosure of Invention
It is a primary object of embodiments of the present application to provide an output control method, a control unit, and a computer-readable storage medium that provide a method by which battery output characteristics that meet user expectations can be output.
In order to achieve the above object, an embodiment of the present application provides an output control method, which is applied to a control unit, an output terminal of the control unit is connected to a control terminal of a switch circuit, the switch circuit is disposed on a power supply output line of a battery pack, and a state detection terminal of the battery pack is connected to a first input terminal of the control unit; the method comprises the following steps: acquiring current state parameters of the battery pack; inputting the current state parameters into a preset virtual battery model, calculating to obtain control parameters for controlling a switching circuit, and sending the control parameters to the switching circuit; the switching circuit outputs a target output voltage or a target output current under the control of the control parameter.
In order to achieve the above object, an embodiment of the present application further provides a control unit, including: the device comprises an acquisition module and a calculation module; the control unit is connected to the output end of the switch circuit, the switch circuit is arranged on a power supply output circuit of the battery pack, and the control unit is also connected to the state detection end of the battery pack; the acquisition module is used for acquiring the current state parameters of the battery pack; the calculation module is used for inputting the current state parameters into a preset virtual battery model, calculating to obtain control parameters for controlling the switch circuit, and sending the control parameters to the switch circuit; the switching circuit outputs a target output voltage or a target output current under the control of the control parameter.
To achieve the above object, an embodiment of the present application further provides a computer-readable storage medium storing a computer program, and the computer program is executed by a processor to implement the above output control method.
In the embodiment of the invention, the control unit acquires the current state parameter of the battery pack, inputs the current state parameter into a preset virtual battery model to calculate the control parameter for controlling the switch circuit, and sends the control parameter to the switch circuit, and the switch circuit can output the target output voltage or the target output current of the virtual battery under the control of the control parameter. Compared with the method for redesigning and manufacturing the battery suitable for each application scene aiming at different application scenes, the embodiment of the application only needs to set or modify the model or the parameters of the model of the virtual battery to calculate the control parameters of the control switch circuit, and then the control parameters are used for controlling the switch circuit, so that the target output voltage or current meeting the expectation of a user can be output according to the current state parameters of the real battery pack, the limitation of the battery internal electric core characteristics on the use of the battery is eliminated, the new battery does not need to be redesigned and manufactured to adapt to the new application scene, and the cost is effectively reduced.
Drawings
FIG. 1 is a block schematic diagram of a circuit to which an output control method according to one embodiment of the present invention is applied;
FIG. 2 is a flow diagram of an output control method according to one embodiment of the invention;
FIG. 3 is a graphical illustration of an ideal battery model output characteristic of an output control method according to one embodiment of the invention;
FIG. 4 is a schematic diagram of a Rint cell model in an output control method according to one embodiment of the present invention;
fig. 5 is a schematic diagram of a Thevenin model of first order RC in an output control method according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of a PNGV model in an output control method according to one embodiment of the present invention;
FIG. 7 is a schematic diagram of a second order RC model in an output control method according to one embodiment of the present invention;
FIG. 8 is a diagram of a GNL model in an output control method according to one embodiment of the present invention;
FIG. 9 is a block schematic diagram of a control unit according to one embodiment of the invention.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present application clearer, the embodiments of the present application will be described in detail below with reference to the accompanying drawings. However, it will be appreciated by those of ordinary skill in the art that in the examples of the present application, numerous technical details are set forth in order to provide a better understanding of the present application. However, the technical solution claimed in the present application can be implemented without these technical details and various changes and modifications based on the following embodiments. The following embodiments are divided for convenience of description, and should not constitute any limitation to the specific implementation manner of the present application, and the embodiments may be mutually incorporated and referred to without contradiction.
With the development of the electric automobile and energy storage battery industry, batteries are required to be applied to various scenes and are also required to have various output characteristics suitable for the scenes, the batteries belong to analog energy storage devices, the external charge and discharge characteristics of the batteries are highly related to the physical and chemical characteristics of electric cores adopted in the batteries, the output characteristics of the batteries are basically fixed after the batteries are designed and manufactured, and users cannot change the output characteristics at will, so that the users can only redesign and manufacture the batteries with different chemical systems, different voltage grades and different capacities according to different application scenes, and when the batteries are designed, the limitations on the types of the electric cores, the serial-parallel connection mode and the like are generally strict, the universality of design and development is poor, the design period is long, and the cost can be greatly increased.
In addition, the inventor finds that due to the fact that the charging and discharging characteristics of batteries of different manufacturers, different models or different old and new degrees are different, if a plurality of batteries with different performances are connected in parallel to be discharged together, the phenomena that some batteries are completely discharged and some batteries are not completely discharged can occur, the batteries which are completely discharged can enter an over-discharge protection state and cannot be used continuously, the problems that the batteries with different performances are connected in parallel to be charged and discharged together can cause bias current and the like can occur, the service life and the safety of the batteries can be seriously influenced, and the problems of fire explosion and the like can be even caused in serious cases. These severe restrictions make batteries of different manufacturers, different types, or different degrees of old and new incompatible during replacement or capacity expansion, and can only be replaced with batteries of the same manufacturer, the same type, and the same degree of old and new, which causes huge economic losses.
In view of the above problems in the background art, an embodiment of the present invention relates to an output control method, and the general idea is: the output characteristics of the battery are virtualized in a software-defined mode, and then the output characteristics of the internal real battery can be converted into the output characteristics of the required virtual battery by controlling a switch circuit on a battery output line according to requirements.
Referring to fig. 1, an output end of the control unit 1 is connected to a control end of a switch circuit 2, the switch circuit 2 is disposed on a power supply output line of a battery pack 3, and a state detection end of the battery pack 3 is connected to a first input end of the control unit 1. In one embodiment, the output of the switching unit 2 is used to connect to a load, other battery pack or a power source.
Please refer to fig. 2 for a detailed flowchart of the output control method of the present embodiment.
Step 101, obtaining the current state parameter of the battery pack.
And 102, inputting the current state parameters into a preset virtual battery model, and calculating to obtain control parameters for controlling the switch circuit.
And 103, sending the control parameters to the switching circuit to control the switching circuit to output the target output voltage or the target output current.
In this embodiment, the control unit may obtain a current state parameter of the battery pack, input the current state parameter into a preset model of the virtual battery to calculate a control parameter for controlling the switching circuit, and send the control parameter to the switching circuit, and the switching circuit may output a target output voltage or a target output current of the virtual battery under the control of the control parameter. Compared with the method for redesigning and manufacturing the battery suitable for each application scene aiming at different application scenes, the embodiment of the application only needs to set or modify the model or the parameters of the model of the virtual battery to calculate the control parameters of the control switch circuit, and then the control parameters are used for controlling the switch circuit, so that the target output voltage or current meeting the expectation of a user can be output according to the current state parameters of the real battery pack, the limitation of the battery internal electric core characteristics on the use of the battery is eliminated, the new battery does not need to be redesigned and manufactured to adapt to the new application scene, and the cost is effectively reduced.
The following describes the implementation details of the output control method of the present embodiment in detail, and the following is only provided for the convenience of understanding and is not necessary for implementing the present embodiment.
Specifically, the control unit may first obtain a current state parameter of the battery pack, and in an embodiment, the current state parameter at least includes any one or any combination of the following: output voltage U of battery packoutOutput current IoutTemperature ToutSOC of the batteryoutAnd capacity CoutAnd then inputting the current state parameters of the battery pack into a preset virtual battery model.
In one embodiment, the model of the virtual battery may be understood as a mapping relationship between an input amount of the virtual battery and an output amount of the virtual battery, at this time, the control unit may input the current state parameter of the battery pack as the input amount of the virtual battery into a preset model of the virtual battery, so as to obtain a target output voltage or a target output current desired by a user, at this time, the control unit may obtain an output voltage or an output current of the switching circuit, and control the output voltage or the output current of the switching circuit to reach the target output voltage or the target output current of the virtual battery in a feedback manner, so as to meet an output characteristic desired by the user.
In another embodiment, the model of the virtual battery may be understood as a mapping relationship between an input amount of the virtual battery and a control parameter of the switch circuit, at this time, the control unit may obtain the control parameter for controlling the switch circuit by inputting the current state parameter of the battery pack into a preset model of the virtual battery as the input amount of the virtual battery, the control unit may send the obtained control parameter to the switch unit, and the switch unit outputs the target output voltage or the target output current of the virtual battery under the control of the control parameter so as to meet the output characteristic desired by the user.
In one embodiment, the user may directly input the type of the target battery and the parameters of the target battery through a setting unit integrated in the control unit 1, and the control unit 1 may determine the model of the virtual battery according to the type of the target battery and/or the parameters of the target battery input by the user.
In another embodiment, referring to fig. 1, the setting unit 4 may not be integrated in the control unit 1, the output end of the switch unit 2 is connected to the third input end of the control unit 1 through the setting unit 4, and the user inputs the type of the target battery and the parameter of the target battery through the setting unit.
In one embodiment, the switching circuit may be specifically a dc conversion circuit, where the dc conversion circuit includes at least one of the following conversion circuits: the circuit comprises a bidirectional H-bridge conversion circuit, a BUCK conversion circuit and a BOOST conversion circuit.
In an embodiment, referring to fig. 1, an output terminal of the switch circuit 2 is connected to a third input terminal of the control unit 1, and the control unit 1 may continuously adjust the voltage or the current output by the switch circuit 2 to output the voltage or the current according to the target output voltage or the target output current.
In one embodiment, the model of the virtual battery comprises an ideal battery model and an equivalent circuit model, wherein the ideal battery model is used for representing the output static characteristics of the virtual battery, the output voltage of the ideal battery model is equal to the open-circuit voltage of the ideal battery model, and the equivalent circuit model is used for representing the output dynamic characteristics of the virtual battery.
For example, the ideal battery model may be represented by a data mapping table or a function formula, and the output characteristic curve of a part of the ideal battery model using the data mapping table is shown in fig. 3, where curve 1 is a relation curve between the SOC (state of charge) of the lithium iron battery and the OCV (Open circuit voltage) of a real battery pack, curve 2 is a relation curve between the SOC of the lead-acid battery and the OCV of a real battery pack, curve 3 is a simulated linear output curve, and curve 4 is a simulated linear output curve, and it is obvious that curves 3 and 4 are not a relation curve between the SOC and the OCV of a real battery pack, and may be understood as an abstract battery, which represents an output characteristic required by a user.
The ideal battery model can be modeled by using a function formulaType is represented as E (SOC)out,Tout,...)，E(SOCout,Tout,..) similar to the real relationship between the OCV of the battery pack and the SOC of the battery pack, there is a difference between the mapping relationships corresponding to different types of ideal battery models, and E (SOC) can be obtained by testing the data of the OCV and SOC of the battery desired by the userout,Tout,..), or directly defined by the user as other linear or non-linear mapping relationships, and then the ideal battery model is used as the model of the virtual battery, i.e., Uout(SOCout,Tout,Iout...)=E(SOCout,Tout,...)。
In one embodiment, the control unit may input the current state parameters of the battery pack as input parameters of the virtual battery into a model of the virtual battery.
For example, due to the SOC of the virtual batteryoutSOC with real battery packinOften varying synchronously, i.e. SOCout=SOCinSo that the obtained SOC can be obtainedinInput to the ideal battery model, which is Eout(SOCin,Tout,..), then the model of the virtual battery at this time is: u shapeout(SOCout,Tout,Iout...)=Eout(SOCin,Tout,...). Note that U isoutOnly the dominant target, which may also include the temperature ToutCurrent IoutAnd the like. Thereafter, the control unit will output the target output voltage U of the virtual batteryout(SOCout,Tout,Iout...) as an adjustment target, control parameters are output to the switching circuit to continuously control the output of the switching circuit so that the external output of the virtual battery exhibits the characteristics of the virtual battery defined by the battery model.
In one embodiment, the equivalent circuit model may be understood as one or more resistors and capacitors connected in series and parallel to the ideal battery model, the connection modes and parameters of the resistors and capacitors of different equivalent circuit models are usually different, and the corresponding dynamic characteristics are also different, and after the equivalent circuit model is added on the basis of the ideal battery model, the dynamic characteristics of the output of the virtual battery can be better improved.
In one embodiment, the control unit may obtain, through the setting unit, a type of a target battery and parameters of the target battery, where the type of the target battery is desired by a user, where the type of the target battery includes, but is not limited to, a lithium battery, a lead-acid battery, and the like, and the parameters of the target battery include, but are not limited to, capacity, voltage, internal resistance, or a series-parallel connection manner of the battery, a model of the target battery, and information that can be converted into a battery type and basic parameters, and may also obtain other types different from general battery characteristics, such as a constant voltage mode, a linear drop, a piecewise linear or other non-linear input-output characteristics, and then obtain a model of the virtual battery according to the above information.
In one embodiment, the equivalent circuit model includes at least any one of: a zero-order Rint model, a Thevenin model of a first-order RC, a PNGV model, a second-order RC model, and a GNL model. Fig. 4 is an equivalent circuit diagram of a zero-order Rint model, fig. 5 is an equivalent circuit diagram of a first-order RC Thevenin model, fig. 6 is an equivalent circuit diagram of a PNGV model, fig. 7 is an equivalent circuit diagram of a second-order RC model, and fig. 8 is an equivalent circuit diagram of a GNL model.
For example, according to the zero-order Rint model, the following expression can be obtained: u = E-I R0(ii) a Wherein E is an input parameter of a model of the virtual battery, and U is a target output voltage; from Thevenin model of first order RC, the following expression can be obtained: u = E-I R0-U1And dU1/dt=I/C1-U1/(R1*C1) The same applies to the other models, and the relationship between U and E can be obtained.
The following description will be made by taking as an example a Thevenin battery model in which an equivalent circuit model is a first-order RC, R in the model1Representing the equivalent internal polarization resistance of the battery, C, desired by the user1Representing the equivalent polarization capacitance, R, of the battery desired by the user0Representing the equivalent internal resistance of the battery desired by the user.
The above parameter values can be obtained by testing the battery expected by the userThe dynamic characteristics are obtained by calculation or are obtained by off-line on-line parameter identification, and can also be directly defined according to the requirement. The relationship between the input and output of the Thevenin battery model of the first order RC can be expressed specifically as: u = E-I R0-U1And dU1/dt=I/C1-U1/(R1*C1) Therefore, it can be seen that the difference between U and E is mapped to other parameters. Generalizing from this example, it can be seen that when other parameters exist in the equivalent circuit model, the difference between U and E can be denoted as Ud(R0,R1,...,C1,C2,...,Iout,Tout,...). At this time, the model of the virtual battery may be Uout(SOCout,Tout,Iout...)=Eout(SOCout,Tout,...)+Ud(R0,R1,...,C1,C2,...,Iout,Tout,..) because of the usual SOCout=SOCinTherefore, the current state parameters of the battery pack are input into the model of the virtual battery, and the following can be obtained: u shapeout(SOCout,Tout,Iout...)=Eout(SOCin,Tout,...)+Ud(R0,R1,...,C1,C2,...,Iout,Tout,..), the control unit will output the target output voltage U of the virtual batteryout(SOCout,Tout,Iout...) as an adjustment target, control parameters are output to the switching circuit to continuously control the output of the switching circuit so that the external output of the virtual battery exhibits the characteristics of the virtual battery defined by the battery model.
R in FIG. 6e、RsR in FIG. 72And R in FIG. 8sThe individual resistances are distinguished only by different indices, C in FIG. 6s、CpC in FIG. 72And C in FIG. 8QThe different subscripts are also used to distinguish the capacitors, and the detailed description thereof is omitted here.
In the above-described embodiment of the present invention,the output voltage of the virtual battery is taken as a main controlled object, and the current I can be used according to a similar principleoutAnd ToutAnd the like, as controlled objects, are controlled by a similar output control method so that the external output of the virtual battery appears to the characteristics of the virtual battery defined by the battery model.
In the above embodiment, only the SOC is usedout=SOCinThis condition is that the current state parameter of the battery pack is inputted into the model of the virtual battery to establish the correspondence between the battery pack and the target output voltage or the target output current, and the SOC alone is generally incapable of expressing the relevant output characteristics of the real battery pack, and therefore, only the SOC is usedout=SOCinThis condition may enable a sufficient decoupling between the real battery pack and the target output voltage or target output current, but in addition, embodiments of the present application may select other current state parameters of the battery pack, such as the voltage UinCurrent IinTemperature TinAnd capacity CinAnd the like, establishing the corresponding relation between the current state parameters and the target output voltage or the target output current.
In one embodiment, the type of the target battery and the parameter of the target battery desired by the user may be acquired through the setting unit and mapped to the quantized voltage U of the virtual batteryoutCurrent Iout、SOCoutAnd capacity CoutThe functional relation or the data table of the equal parameters and the states is used for obtaining the real current state parameter voltage U of the battery packinCurrent IinTemperature Tin、SOCinAnd capacity CinEtc., the following expression can be derived from the above information: f. ofout(Uout,SOCout,Tout,Iout,t...)=f(Uin,SOCin,Tin,IinT.)) to be a transfer function relationship or mapping table, it is apparent that the expression is time t or U of the internal batteryin、SOCin、TinAnd IinEtc., the expression being, for example, Uout(SOCout,Tout...)=a*UinAnd a is a constant, a user can enlarge or reduce the ratio of the target output voltage of the virtual battery to the voltage actually output by the battery pack by adjusting a, and the adjustment coefficient a can simulate batteries with any number of strings.
In one embodiment, the second input terminal of the control unit is connected to the state detection terminal of the battery pack connected in parallel with the battery pack, and before the current state parameter is input into the preset model of the virtual battery, the model of the virtual battery needs to be determined according to the acquired voltage or current output by the battery pack connected in parallel with the battery pack.
If the battery is required to be applied to a scene in which the battery is used in parallel with other batteries, the control unit can monitor the change rule of parameters such as voltage and current of other external batteries, power supplies or loads, and control the switch units arranged on the power supply output lines of the battery packs by using the output control method, so that the battery types and basic parameters expected by a user can be obtained through conversion according to the current state parameters of the battery packs, and thus, the external output characteristics of the virtual battery can be controlled to simulate other batteries in parallel connection, the intelligent parallel connection use with other batteries is realized, or the output of the virtual battery adapts to the characteristics of the loads and the power supplies.
In the embodiment, according to the output control method, the external output characteristics of the battery can present the characteristics of the batteries similar to the types of the lithium battery, the lead-acid battery and the like, without the need of considering the actual internal battery types, and without the need of distinguishing whether the batteries are the same in manufacturer, model and old-new degree. The problem of different producers, different model batteries, the different new and old degree battery of current are difficult to the parallelly connected use is solved, very big the expansion of the good past of battery of having made things convenient for.
Moreover, according to the output control method, the output characteristics of the battery can be changed only by setting or adjusting the model of the virtual battery without redesigning hardware. Not limited to the battery-like characteristics, other nonlinear, linear output characteristics may also be defined, such as constant voltage output, linearly decreasing output, piecewise linear output, and the like. The method can adapt to various new application scenes such as loads with different voltage grades, different powers and dynamic changes.
Further, according to the output control method, the output characteristics of the battery can be effectively improved. For example, a general battery may have a lower discharge voltage due to low-temperature activity, and when a large current is discharged at low temperature, the voltage of the battery may drop below a load operable voltage range to end the discharge in advance.
An embodiment of the present invention relates to a control unit, please refer to fig. 9, which includes: an acquisition module 201 and a calculation module 202; the control unit is connected to the output end of the switch circuit, the switch circuit is arranged on a power supply output circuit of the battery pack, and the control unit is further connected to the state detection end of the battery pack.
The obtaining module 201 obtains the current state parameters of the battery pack, and the calculating module 202 inputs the current state parameters into a preset virtual battery model, calculates control parameters for controlling the switch circuit, and sends the control parameters to the switch circuit.
Specifically, the switching circuit outputs a target output voltage or a target output current under the control of the control parameter.
In one embodiment, the switching circuit is a dc conversion circuit, wherein the dc conversion circuit includes any one of the following conversion circuits: the circuit comprises a bidirectional H-bridge conversion circuit, a BUCK conversion circuit and a BOOST conversion circuit.
In an embodiment, referring to fig. 9, the control unit further includes a determining module 203, the determining module 203 is connected to the calculating unit 202, the determining module 203 obtains the type of the target battery and the parameters of the target battery input by the user, and determines a model of the virtual battery, where the model of the virtual battery includes an ideal battery model and an equivalent circuit model, and the calculating unit 202 inputs the current state parameters into the model of the virtual battery as the input parameters of the virtual battery.
The ideal battery model is used for representing the output static characteristic of the virtual battery, the output voltage of the ideal battery model is equal to the open-circuit voltage of the ideal battery model, and the equivalent circuit model is used for representing the output dynamic characteristic of the virtual battery. The equivalent circuit model may include any one of the following models: a zero-order Rint model, a Thevenin model of a first-order RC, a PNGV model, a second-order RC model, and a GNL model.
In one embodiment, the second input terminal of the control unit is connected to the state detection terminal of the battery pack connected in parallel with the battery pack, the control unit further includes a determination module 203, the determination module 203 is connected to the calculation unit 202, and the determination module 203 determines the model of the virtual battery according to the acquired voltage or current output by the battery pack connected in parallel with the battery pack.
It should be understood that this embodiment is a system embodiment corresponding to the embodiment corresponding to fig. 2, and this embodiment can be implemented in cooperation with the embodiment corresponding to fig. 2. The related technical details mentioned in the embodiment corresponding to fig. 2 are still valid in this embodiment, and are not described herein again in order to reduce repetition. Accordingly, the related art details mentioned in the present embodiment can also be applied to the embodiment corresponding to fig. 2.
It should be noted that, all the modules involved in this embodiment are logic modules, and in practical application, one logic unit may be one physical unit, may also be a part of one physical unit, and may also be implemented by a combination of multiple physical units. In addition, in order to highlight the innovative part of the present invention, a unit which is not so closely related to solve the technical problem proposed by the present invention is not introduced in the present embodiment, but this does not indicate that there is no other unit in the present embodiment.
One embodiment of the present invention relates to a computer-readable storage medium storing a computer program. The computer program realizes the above-described method embodiments when executed by a processor.
That is, as can be understood by those skilled in the art, all or part of the steps in the method for implementing the embodiments described above may be implemented by a program instructing related hardware, where the program is stored in a storage medium and includes several instructions to enable a device (which may be a single chip, a chip, or the like) or a processor (processor) to execute all or part of the steps of the method described in the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
It will be understood by those of ordinary skill in the art that the foregoing embodiments are specific examples for carrying out the invention, and that various changes in form and details may be made therein without departing from the spirit and scope of the invention in practice.

Claims (7)

1. An output control method is characterized in that the output control method is applied to a control unit, the output end of the control unit is connected with the control end of a switch circuit, the switch circuit is arranged on a power supply output line of a battery pack, and a state detection end of the battery pack is connected with a first input end of the control unit;
the method comprises the following steps:
acquiring current state parameters of the battery pack;
the second input end of the control unit is connected to the state detection end of the reference battery pack, and a model of the virtual battery is determined according to the acquired voltage or current output by the reference battery pack; the reference battery pack is connected with the battery pack in parallel, and the output characteristics of the reference battery pack and the battery pack are different;
inputting the current state parameters into a determined virtual battery model, calculating to obtain control parameters for controlling the switch circuit, and sending the control parameters to the switch circuit;
the switching circuit outputs a target output voltage or a target output current under the control of the control parameter;
the output characteristic of the virtual battery is defined by software as one of the following characteristics: output characteristics of a real battery type, output characteristics other than a real battery type.
2. The output control method according to claim 1, characterized in that the model of the virtual battery includes an ideal battery model and an equivalent circuit model;
the ideal battery model is used for representing the output static characteristics of the virtual battery, the output voltage of the ideal battery model is equal to the open-circuit voltage of the ideal battery model, and the equivalent circuit model is used for representing the output dynamic characteristics of the virtual battery.
3. The output control method according to claim 2, wherein the equivalent circuit model includes at least any one of: a zero-order Rint model, a Thevenin model of a first-order RC, a PNGV model, a second-order RC model, and a GNL model.
4. The output control method according to any one of claims 1 to 3, wherein the current state parameter includes at least any one or any combination of: the output voltage, output current, temperature, state of charge and capacity of the battery pack.
5. A control unit, comprising: the device comprises an acquisition module, a calculation module and a determination module; the control unit is connected to the output end of the switch circuit, the switch circuit is arranged on a power supply output circuit of the battery pack, and the control unit is also connected to the state detection end of the battery pack;
the acquisition module is used for acquiring the current state parameters of the battery pack;
the second input end of the control unit is connected to the state detection end of the reference battery pack, and the determination module is used for determining a model of the virtual battery according to the acquired voltage or current output by the reference battery pack; the reference battery pack is connected with the battery pack in parallel, and the output characteristics of the reference battery pack and the battery pack are different;
the calculation module is used for inputting the current state parameters into the determined model of the virtual battery, calculating to obtain control parameters for controlling the switch circuit, and sending the control parameters to the switch circuit;
the switching circuit outputs a target output voltage or a target output current under the control of the control parameter; the output characteristic of the virtual battery is defined by software as one of the following characteristics: output characteristics of a real battery type, output characteristics other than a real battery type.
6. The control unit of claim 5, wherein the model of the virtual battery comprises an ideal battery model and an equivalent circuit model;
the ideal battery model is used for representing the output static characteristics of the virtual battery, the output voltage of the ideal battery model is equal to the open-circuit voltage of the ideal battery model, the equivalent circuit model is used for representing the output dynamic characteristics of the virtual battery, and the equivalent circuit model at least comprises any one of the following models: a zero-order Rint model, a Thevenin model of a first-order RC, a PNGV model, a second-order RC model, and a GNL model.
7. A computer-readable storage medium storing a computer program, wherein the computer program is executed by a processor to implement the output control method of any one of claims 1 to 4.
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