CN116565998A - Charging and discharging control method of battery pack, energy storage system and storage medium - Google Patents
Charging and discharging control method of battery pack, energy storage system and storage medium Download PDFInfo
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- CN116565998A CN116565998A CN202310364740.2A CN202310364740A CN116565998A CN 116565998 A CN116565998 A CN 116565998A CN 202310364740 A CN202310364740 A CN 202310364740A CN 116565998 A CN116565998 A CN 116565998A
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- 238000007599 discharging Methods 0.000 title claims abstract description 49
- 238000000034 method Methods 0.000 title claims abstract description 39
- 238000004146 energy storage Methods 0.000 title claims abstract description 22
- 238000006243 chemical reaction Methods 0.000 claims abstract description 116
- 230000004224 protection Effects 0.000 claims abstract description 52
- 230000005764 inhibitory process Effects 0.000 claims abstract description 9
- 238000011084 recovery Methods 0.000 claims description 13
- 238000004590 computer program Methods 0.000 claims description 7
- 238000010586 diagram Methods 0.000 description 5
- 230000005611 electricity Effects 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003550 marker Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
- H01M10/441—Methods for charging or discharging for several batteries or cells simultaneously or sequentially
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
- H01M10/482—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for several batteries or cells simultaneously or sequentially
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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
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00306—Overdischarge protection
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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
- H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
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- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Power Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Secondary Cells (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The application discloses a charge and discharge control method of battery package, energy storage system and storage medium, the battery package is through the external discharge of power conversion equipment or accept the charge, charge and discharge control method includes: under the discharging state, when the battery voltage of the battery pack is detected to meet the under-voltage protection condition, accumulating the times of under-voltage protection in a first preset time period; setting a discharge inhibition zone bit if the undervoltage protection times reach preset times and the battery voltage is smaller than or equal to a first voltage threshold value; when the discharge prohibition flag bit is set, a first control signal is sent to the power conversion equipment; the first control signal is for disabling the power conversion device from drawing power from the battery pack. The power supply equipment can be prevented from taking power from the battery pack to supply power to the load when the battery pack is in an under-voltage state, and continuously consumes the battery pack power, so that the battery pack voltage is too low, the service life of the battery pack is influenced, and the use safety of the equipment is ensured.
Description
Technical Field
The application relates to the technical field of energy storage, in particular to a charge and discharge control method of a battery pack, the battery pack, an energy storage system and a storage medium.
Background
In some energy storage power systems, one or more battery packs may be connected to the same power conversion device to discharge or receive charge. For the power conversion device, when the load and the charging device, such as photovoltaic, are connected at the same time, if the load needs more electric energy than the charging device, the load can be powered by taking electric energy from the battery pack. At this time, the battery pack is in a discharging state, and in some cases, the charging and discharging loop is disconnected after the battery pack is discharged to an undervoltage, but due to the existence of the charging equipment, the battery pack detects that the equipment is connected to be considered to be about to be charged, then the charging and discharging loop is conducted again, and the discharging state is reentered, so that the battery pack is easily caused to be overdischarged repeatedly, the service life of the battery pack is influenced, and safety accidents are easily caused.
Disclosure of Invention
The application provides a charge and discharge control method of a battery pack, the battery pack, an energy storage system and a storage medium, and aims to solve the problem that the service life of the battery pack is reduced due to overdischarge of the existing battery pack.
In a first aspect, the present application provides a charge-discharge control method of a battery pack, where the battery pack discharges or receives charge to the outside through a power conversion device, the charge-discharge control method including:
under the discharging state, when the battery voltage of the battery pack is detected to meet the under-voltage protection condition, accumulating the times of under-voltage protection in a first preset time period;
setting a discharge inhibition zone bit if the undervoltage protection times reach preset times and the battery voltage is smaller than or equal to a first voltage threshold value;
when the discharge prohibition flag bit is set, a first control signal is sent to the power conversion equipment; the first control signal is for disabling the power conversion device from drawing power from the battery pack.
In a second aspect, the present application provides a battery pack, where the battery pack includes a battery, a charging switch, a discharging switch, a connection port, and a controller, where the battery is connected to the connection port through the charging switch and the discharging switch, the connection port is used to connect to a power conversion device, a control end of the charging switch and the discharging switch is connected to the controller, and the controller is used to execute the battery pack charging and discharging control method provided by the embodiments of the present application.
In a third aspect, the present application provides an energy storage system, where the energy storage system includes a battery pack and a power conversion device provided by an embodiment of the present application, and the power conversion device further includes a load interface and a charging interface, where the load interface is used to access a load to supply power to the load, and the charging interface is used to access a power supply to supply power to the load and/or charge the battery pack.
In a fourth aspect, the present application provides a storage medium having stored thereon a computer program which, when executed by a processor, implements the charge and discharge control method of a battery pack provided by the embodiments of the present application.
The application provides a charge-discharge control method, energy storage equipment, an energy storage system and a storage medium. Therefore, when the battery pack is continuously under-voltage and is not charged to be capable of discharging, the power conversion equipment is prohibited from taking power from the battery pack again to supply power to the load, the situation that the input power of the charging power supply of the power conversion equipment is unstable can be avoided, the battery pack electric energy is continuously consumed, the battery pack voltage is enabled to be too low, the service life of the battery pack is influenced, and the use safety of the equipment is ensured.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of an energy storage system according to an embodiment of the present disclosure;
FIG. 2 is a schematic diagram of another energy storage system according to an embodiment of the present disclosure;
fig. 3 is a schematic flow chart of a charge-discharge control method of a battery pack according to an embodiment of the present disclosure;
fig. 4 is a flowchart of still another embodiment implementation of a method for controlling charge and discharge of a battery pack according to an embodiment of the present application;
fig. 5 is a flowchart of still another implementation of a method for controlling charge and discharge of a battery pack according to an embodiment of the present application;
fig. 6 is a flowchart of another embodiment of a method for controlling charge and discharge of a battery pack according to an embodiment of the present application.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
The flow diagrams depicted in the figures are merely illustrative and not necessarily all of the elements and operations/steps are included or performed in the order described. For example, some operations/steps may be further divided, combined, or partially combined, so that the order of actual execution may be changed according to actual situations.
It is to be understood that the terminology used in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in this specification and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be understood that, in order to clearly describe the technical solutions of the embodiments of the present application, in the embodiments of the present application, the words "first", "second", etc. are used to distinguish the same item or similar items having substantially the same function and effect. For example, the first control signal and the second control signal are merely for distinguishing between different control signals, and are not limited in their sequence. It will be appreciated by those of skill in the art that the words "first," "second," and the like do not limit the amount and order of execution, and that the words "first," "second," and the like do not necessarily differ.
It should also be understood that the term "and/or" as used in this specification and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes such combinations.
Some embodiments of the present invention are described in detail below with reference to the accompanying drawings. The following embodiments and features of the embodiments may be combined with each other without conflict.
Referring to fig. 1, fig. 1 is a schematic structural diagram of an energy storage system according to an embodiment of the present application. As shown in fig. 1, the energy storage system 100 includes a battery pack 10 and a power conversion device 20.
The power conversion device 20 further includes a load interface for interfacing with the load 30 to power the load 30, and a charging interface for interfacing with the power supply 40 to power the load 30 and/or charge the battery pack 10. By way of example, the power conversion device 20 may also include a direct current conversion circuit and a bi-directional inverter circuit by which direct current (e.g., provided by a battery pack, photovoltaic panel) is converted to alternating current (typically 220v,50hz sine wave) or alternating current is converted to direct current. The dc conversion circuit is used for converting the dc voltage output from the dc input source or the inverter circuit into the voltage and outputting the voltage to the load or the battery pack 10. When the power conversion device 20 is connected to the battery pack 10, the power conversion device 20 may be used to charge the battery pack 10 or to draw power from the battery pack 10 to power the load 30.
With continued reference to fig. 1, the battery pack 10 includes a battery 11, a charge switch 12, a discharge switch 13, a connection port 14, and a controller 15. Wherein the battery 11 is connected with a connection port 14 through a charge switch 12 and a discharge switch 13, the connection port 14 being for connection with a power conversion device 20 to receive charge or discharge to the outside.
The battery 11 may be 1 single battery cell or a battery cell group formed by connecting a plurality of battery cells in series, and the number of battery cells in the battery 11 is related to the power consumption requirement of the use scene of the battery pack 10, which is not limited by the embodiment and the drawings of the present application.
The controller 15 is connected to the control terminals of the charge switch 12 and the discharge switch 13, and is used for controlling the charge switch 12 and the discharge switch 13 to be turned on or off. The controller 15 may also be used to perform the charge-discharge control method provided in the embodiments of the present application.
The power conversion device 20 voltage-converts the input voltage of the power supply 40 and simultaneously outputs the converted voltage to the load 30 to supply power and charge the battery pack 10. When the voltage converted by the power conversion apparatus 20 cannot meet the power supply requirement of the load 30, power needs to be taken from the battery pack 10 to supply power to the load 30. Therefore, when the input source connected to the power conversion device 20 is, for example, a photovoltaic input power source 40, the power conversion device 20 needs to draw power from the battery pack 10 to supply power to the load 30. At this time, the battery pack 10 triggers the under-voltage protection after discharging to the under-voltage, and the controller 15 turns off the charging switch 12 and the discharging switch 13 to stop discharging. However, since the battery pack 10 is still connected to the power conversion device 20 at this time, the power conversion device 20 will continuously send information to the controller 15 to inform the power supply 40 of the connection, and the controller 15 will consider that the charging is about to be performed and turn on the charging switch 12 and the discharging switch 13 again when confirming that the power supply 40 is connected. After the charge switch 12 and the discharge switch 13 are turned on, the power conversion device 20 continues to draw power from the battery pack 10 to supply power to the load 30 for the same reason, and the battery pack 10 is put into a discharge state again. In this way, after the battery pack 10 is discharged to the under-voltage controller 15 and the charging switch 12 and the discharging switch 13 are disconnected, the controller 15 turns on the charging switch 12 and the discharging switch 13 under the condition that the power supply 40 is connected, so that the battery pack 10 begins to discharge again, the charging switch 12 and the discharging switch 13 are disconnected again after discharging to the under-voltage, the charging switch 12 and the discharging switch 13 are again detected to be connected and turned on again after the power supply 40 is connected, the charging switch 12 and the discharging switch 13 are repeatedly turned on, the battery pack 10 is repeatedly and electrically taken by the power conversion device 20 to supply power to the load 30, the battery pack 10 is in an overdischarge state finally, the electric energy is completely consumed, and safety risks are easily caused.
Therefore, the embodiment of the application provides a charge-discharge control method of the battery pack, so as to avoid the safety risk caused by overdischarge of the battery pack 10 and ensure the safety of the device.
It will be appreciated that the energy storage system 100 shown in fig. 1 is merely exemplary and is not to be construed as limiting the embodiments of the present application. In some embodiments, the battery pack 10 and the power conversion device 20 may also be integrated into the same device, such as an energy storage device, which operates on the same principle as when used as the energy storage system 100. Here, the energy storage device refers broadly to a device for storing electric energy, and may specifically be a portable power source for storing electric energy only, or may be a power source device integrated with a power generation module, which is not limited herein.
For example, the controller 15 may integrate a battery management system (Battery Management System, BMS) for managing the operation of the battery 10, including, but not limited to, sampling and monitoring parameters related to the charge and discharge of the battery pack, and controlling the on and off of the charge switch 11. The controller 15 may be, for example, a micro control unit (Microcontroller Unit, MCU).
Illustratively, an MCU may also be integrated within the power conversion device 20 that may communicate with the controller 15 within the battery pack 10 to control the power conversion device 20 to provide a charging voltage to the battery pack 10, or to draw power from the battery pack 10, etc.
In some embodiments, as shown in fig. 2, fig. 2 is a schematic structural diagram of another energy storage system according to an embodiment of the present application. In fig. 2, the energy storage system 100 includes a battery pack 10 and a power conversion device 20.
The power conversion device 20 further includes a load interface for interfacing with the load 30 to power the load 30, and a charging interface for interfacing with the power supply 40 to power the load 30 and/or charge the battery pack 10.
The battery pack 10 includes a battery 11, a charge switch 12, a discharge switch 13, a connection port 14, and a controller 15. The charging switch 12 and the discharging switch 13 are respectively a charging MOS tube Q 1 And discharge MOS transistor Q 2 The connection terminal 14 includes a positive terminal p+ and a negative terminal P-. The positive electrode of the battery 11 is connected to the positive electrode terminal p+ of the connection terminal, and the negative electrode of the battery 11 is connected to the negative electrode terminal P-of the connection terminal. The connection port 14 is used for connection with the power conversion device 20, and the power conversion device 20 is also connected with the load 30 and the power supply 40, respectively. It will be appreciated that the load interface of the power conversion device 20 further includes a load switch K1, where the load switch K1 is configured to turn on the connection of the power conversion device 20 to the load 30 when closed, or to cut off the power supply loop of the power conversion device to the load 30 when open.
The power conversion device 20 is capable of charging the battery pack via the positive terminal P+ and the negative terminal P-, and charging/discharging the MOS transistor Q of the battery pack 10 1 And Q 2 When both are on, if the power demand of the load 30 is greater than the output power of the power conversion device 20, then the power conversion device 20 can draw power from the battery pack 10 to power the load 30. The switch K is turned off by the power conversion device 30 by the need to send a discharge prohibition instruction to the power conversion device 30 through the controller 15 when the battery pack 10 is discharged to the battery 11 in the under-voltage state 1 To disconnect the power conversion device 20 from the load 30The power conversion-free device 30 still draws power from the battery pack 10 to power the load 30.
When the power conversion device 20 is connected to the power supply 40, information is continuously sent to the controller 15 to inform the controller 15 of the connection of the power supply 40, and when the controller 15 detects that the power conversion device 20 is connected to the power supply 40, the controller 15 considers that the battery pack 10 is about to enter a charging state. The controller 15 simultaneously turns on the MOS transistor Q 1 And MOS tube Q 2 In preparation for entering a state of charge. At this time, if the power supply 40 connected to the power conversion device 20 is not or is not low in power supply, the load switch K is not turned off 1 The power conversion device 20 still draws power from the battery pack 10 to power the load 30, resulting in overdischarging the battery 11 and thus affecting the life of the battery pack 10 and easily leading to safety risks.
In the battery pack provided in the above embodiments, when the battery pack 10 is connected to the power conversion device 20, when the battery pack 10 is continuously under-voltage and is not yet charged to be able to discharge, the battery pack discharging switch 13 is turned off, and meanwhile, the connection between the power conversion device 20 and the load 30 is also cut off, so that the power conversion device 20 can be prevented from taking electricity from the battery pack 10 again to supply power to the load, the electric energy of the battery pack 10 is continuously consumed, the voltage of the battery pack 10 is excessively low, the service life of the battery pack 10 is affected, and meanwhile, the use safety of the device can be ensured. Referring to fig. 3, fig. 3 is a flow chart of a method for controlling charge and discharge of a battery pack according to an embodiment of the present application, where the method is applied to the battery pack according to any one of the embodiments of the present application, and may be implemented by a controller of the battery pack.
As shown in fig. 3, the charge and discharge control method of the battery pack includes steps S101 to S103. The following is a description with reference to fig. 1 and 2.
S101, under the discharging state, when the battery voltage of the battery pack is detected to meet the under-voltage protection condition, accumulating the times of under-voltage protection in a first preset time period.
Specifically, the controller 15 monitors in real time whether the battery voltage of the battery pack 10 satisfies the under-voltage protection condition when the power conversion apparatus 20 takes electricity from the battery pack 10 to supply power to the load 30, that is, when the battery pack 10 is in a discharge state. When the controller 15 monitors that the battery voltage of the battery pack 10 meets the under-voltage protection condition, the number of times of triggering the under-voltage protection of the battery pack 10 is accumulated within a first preset duration.
Illustratively, when the battery pack 10 is discharged to an under-voltage condition, the controller 15 turns off the charge switch 12 and the discharge switch 13 of the battery pack 10, and the battery pack 10 triggers an under-voltage protection. When the battery voltage of the battery pack 10 meets the under-voltage protection condition, by accumulating the times of triggering the under-voltage protection of the battery pack 10 within the first preset duration, it can be judged whether an overdischarge condition caused by repeated starting is possible at this time, if yes, the power conversion device 20 needs to be stopped immediately to take electricity from the battery pack 10 to supply power to the load 30, and the service life of the battery pack 10 is prevented from being influenced due to the overdischarge of the battery pack 10. Illustratively, the under-voltage protection condition is that the battery voltage is less than an under-voltage protection threshold, such as the under-voltage protection threshold of the battery pack 10 is 2.5V. When the controller 15 detects that the battery voltage of the battery pack 10 is 2.3V, the battery voltage of the battery pack 10 meets the under-voltage protection condition, and under-voltage protection is triggered, at this time, the controller 15 disconnects the discharge MOS Q 2 Stopping discharging and starting timing, and accumulating the times of under-voltage protection in a first preset time.
Illustratively, in some embodiments, the first predetermined time period is 5 minutes. The first preset time period is a safety time period set according to the type of the battery 11 in the battery pack 10.
It can be appreciated that if the number of times of under-voltage protection does not reach the preset number of times in the first preset time period, the accumulated number of times of under-voltage protection can be cleared after waiting for a certain time period. The waiting time may be a longer time period than the first preset time period, for example, 10 minutes.
S102, setting a discharge inhibition flag bit if the undervoltage protection times reach preset times and the battery voltage is smaller than or equal to a first voltage threshold value.
Specifically, the discharge prohibition flag bit is used to indicate whether the battery pack is permitted to discharge. For example, the discharge-prohibited flag bit may be an integer data representation of 1 bit, set when the flag bit is "1", representing that the battery pack is not permitted to discharge, and reset when the flag bit is "0", representing that the battery pack is permitted to discharge.
When the number of times the battery pack 10 triggers the under-voltage protection reaches the preset number of times and the battery voltage is less than or equal to the first voltage threshold value within the preset time, at this time, the controller 15 can determine that the battery pack 10 cannot discharge for the external load 30, and the controller 15 sets the discharge prohibition flag of the battery pack 10 to indicate that the battery pack 10 is not permitted to discharge, so as to avoid the life of the battery pack 10 from being damaged or even causing a safety accident.
For example, when the first preset time period is 5 minutes, the preset number of times may be 3 times. The specific number of the preset times is selected by combining with a first preset time length, and is a critical value of the safety times of triggering the under-voltage protection times of the battery pack in the first preset time length.
Illustratively, when the under-voltage protection threshold of the battery pack 10 is 2.5V, the first voltage threshold is 2.4V.
It will be appreciated that the first voltage threshold may be the discharge minimum operating voltage of the battery pack 10, which is generally less than the under-voltage protection threshold of the battery pack 10, such that the battery pack 10 is prevented from sustaining discharge at the under-voltage point. Meanwhile, the first voltage threshold is set to be smaller than the under-voltage protection threshold, and it is also possible to further detect that the battery pack 10 is already in an overdischarge state at present, and its voltage has been reduced to the lowest safe voltage. S103, when the discharge marker position is forbidden to be set, a first control signal is sent to the power conversion equipment; the first control signal is used to disable the power conversion device from drawing power from the battery pack.
Specifically, when the discharge prohibition flag is set, it is indicated that the battery pack 10 does not permit discharge, and at this time, only the discharge MOS transistor Q is turned off 2 It is not possible to completely inhibit the discharge of the battery pack 10, and it is also necessary to secure the discharge MOS transistor Q 2 After the various conditions are turned on, the power conversion device 20 again draws power from the battery pack 10. Accordingly, upon disabling the discharge flag position bit, the controller 15 sends a first control signal to the power conversion device 20 indicating that the power conversion device 20 is no longer taking power from the battery pack 10. At this time, the power conversion device 30 cuts off the connection of the load 30 and the power conversion device 20, even if the power supply 40 inputs powerIn this case, the power conversion device 30 is not able to draw power from the battery pack 10 to power the load 30.
Thus, the battery pack is prevented from continuously discharging at the undervoltage point, so that the service life of the battery pack 10 is damaged and even safety accidents are caused.
For example, please refer to fig. 2, when the controller 15 sends the first control signal to the power conversion device 20, the power conversion device 20 turns off the switch K 1 To disconnect the load 30 from the power conversion device 20, the power conversion device 20 cannot draw power from the battery pack 10 to power the load 30.
In the above embodiment, by accumulating the number of times of the under-voltage protection condition of the battery pack 10 within the first preset time period, the power conversion apparatus 20 is prohibited from taking the electricity from the battery pack 10 after the number of times of the under-voltage protection reaches the preset number of times. The continuous consumption of the electric energy of the battery pack 10 under the condition that the input power of the charging power supply 40 connected to the power conversion equipment 20 is unstable can be avoided, so that the voltage of the battery pack 10 is too low, the service life of the battery pack 10 is influenced, and the use safety of the equipment is ensured.
Fig. 4 is a flowchart of still another embodiment of a method for controlling charge and discharge of a battery pack according to an embodiment of the present application. As shown in fig. 4, as an embodiment, unlike the embodiment corresponding to fig. 3, steps S201 to S203 are further included in the embodiment corresponding to fig. 4.
S201, when the discharge prohibition flag is set, the charge state of the battery pack is acquired.
When the discharge prohibition flag is set, it indicates that the battery pack 10 does not permit discharge, and the power conversion device 20 needs to disconnect the load 30 to ensure that the discharge MOS transistor Q is discharged 2 Since the power conversion apparatus 20 does not take power from the battery pack 10 again after various conditions are turned on, and at this time, the power conversion apparatus 20 can charge the battery pack 10 after voltage-converting the input voltage of the power supply 40. In this way, when the battery pack 10 is charged to a certain extent, the battery pack 10 can be again allowed to discharge, and the controller 15 resets the discharge prohibition flag. Thus, the controller 15 acquires the SOC (State of Charge) of the battery 11 in real time, which may reflect the remaining amount of the battery 11The remaining power is used for further confirming whether the current remaining power of the battery 11 satisfies the recovery discharging condition.
S202, if the state of charge meets the discharge recovery condition, resetting the discharge inhibition flag bit and resetting the undervoltage protection times.
If the obtained SOC of the battery 11 meets the recovery discharge condition, which indicates that the remaining capacity of the battery 11 can be normally discharged at this time, the controller 15 resets the discharge prohibition flag bit and clears the under-voltage protection times. Subsequently, the power conversion device 20 may draw power from the battery pack 10 to power the load 30 when it is desired to draw power from the battery pack 10.
Illustratively, the recovery discharge condition may be: the state of charge of the battery 11 is equal to or greater than a preset state of charge, for example 5%. The preset state of charge is a critical value of the state of charge of the battery pack 10 that can be normally discharged, and may be set according to the full charge capacity of the battery pack 10, which is not limited in this application.
And S203, transmitting a second control signal to the power conversion device, and allowing the power conversion device to take power from the battery pack.
After resetting the discharge prohibition flag bit and clearing the under-voltage protection number, it is indicated that the power conversion device 20 can normally take power from the battery pack 10 to supply power to the load 30, but the power conversion device 20 has not confirmed the restoration. At this time, the controller 15 transmits a second control signal to the power conversion device 20, instructing the power conversion device 20 to conduct connection of the power conversion device 20 with the load to allow the power conversion device 20 to draw power from the battery pack 10.
For example, referring to fig. 2, when the controller 15 sends the second control signal to the power conversion device 20, the power conversion device 20 turns on the switch K 1 To restore the connection of the load 30 to the power conversion device 20, the power conversion device 20 can draw power from the battery pack 10 to power the load 30.
In the above embodiment, when the state of charge meets the recovery discharging condition, the discharge prohibition flag bit is reset and the recovery power conversion device 20 takes electricity from the battery pack 10, so that the battery pack 10 provided by the application can quickly recover the normal use of the device under the condition of ensuring safety.
Fig. 5 is a flowchart of still another embodiment of a method for controlling charge and discharge of a battery pack according to an embodiment of the present application. As shown in fig. 5, as an embodiment, unlike the embodiment corresponding to fig. 3, steps S301 to S303 are further included in the embodiment corresponding to fig. 5.
S301, when the discharge prohibition flag is set, the battery voltage of the battery pack is acquired.
When the discharge prohibition flag is set, it indicates that the battery pack 10 does not permit discharge, and the power conversion device 20 needs to disconnect the load 30 to ensure that the discharge MOS transistor Q is discharged 2 Since the power conversion apparatus 20 does not take power from the battery pack 10 again after various conditions are turned on, and at this time, the power conversion apparatus 20 can charge the battery pack 10 after voltage-converting the input voltage of the power supply 40. In this way, when the battery pack 10 is charged to a certain extent, the battery pack 10 can be again allowed to discharge, and the controller 15 resets the discharge prohibition flag. Therefore, the controller 15 acquires the battery voltage of the battery pack 10 in real time, which can reflect the capacity of the battery 11 to some extent, for further confirming whether the battery 11 currently satisfies the recovery discharge condition.
S302, if the battery voltage meets the discharge recovery condition, resetting the discharge inhibition flag bit and resetting the undervoltage protection times.
If the obtained battery voltage of the battery pack 10 meets the recovery discharging condition, which indicates that the battery voltage of the battery pack 10 can be normally discharged at this time, the controller 15 resets the discharge prohibition flag bit and clears the under-voltage protection times. Subsequently, the power conversion device 20 may draw power from the battery pack 10 to power the load 30 when it is desired to draw power from the battery pack 10.
Illustratively, the recovery discharge condition may be: the battery pack voltage is equal to or greater than a preset battery voltage, for example, 2.5V. The preset battery voltage is a threshold value of the battery voltage that the battery pack 10 can normally discharge, and may be set according to the full charge capacity of the battery pack 10, which is not limited in this application. And S303, sending a second control signal to the power conversion device, and allowing the power conversion device to take power from the battery pack.
After resetting the discharge prohibition flag bit and clearing the number of undervoltage protections, it is indicated at this time that the power conversion apparatus 20 can normally take power from the battery pack 10 to supply the load 30, but the power conversion apparatus 20 has not confirmed the situation yet. At this time, the controller 15 transmits a second control signal to the power conversion device 20, instructing the power conversion device 20 to conduct connection of the power conversion device 20 with the load to allow the power conversion device 20 to draw power from the battery pack 10.
In the above embodiment, when the battery voltage meets the discharge recovery condition, the discharge prohibition flag bit is reset and the power conversion device is recovered to take power from the battery pack, so that the battery pack provided by the application can quickly recover the normal use of the device under the condition of ensuring safety.
Fig. 6 is a flowchart of still another embodiment of a method for controlling charge and discharge of a battery pack according to an embodiment of the present application. As shown in fig. 6, as an embodiment, unlike the embodiment corresponding to fig. 4, step S401 is further included in the embodiment corresponding to fig. 6.
S401, when the discharge prohibition flag is set, if the battery voltage meets the preset shutdown condition, executing shutdown operation.
When the discharge prohibition flag is set, it indicates that the battery pack 10 does not permit discharge, and the power conversion device 20 needs to disconnect the load 30 to ensure that the discharge MOS transistor Q is discharged 2 Since the power conversion apparatus 20 does not take power from the battery pack 10 again after various conditions are turned on, and at this time, the power conversion apparatus 20 can charge the battery pack 10 after voltage-converting the input voltage of the power supply 40. At this time, if the battery voltage of the battery pack 10 meets the preset shutdown condition, the battery pack 10 is not allowed to be reused, and the battery pack 10 needs to be directly shutdown to avoid safety accidents.
Exemplary, the preset shutdown conditions include: the battery voltage of the battery pack is less than the second voltage threshold for a second preset period of time.
It will be appreciated that since the battery pack 10 has accumulated the number of undervoltage protections for the first preset period of time to reach the preset number, the continuous undervoltage may cause the battery capacity of the battery pack 10 to approach 0 infinitely, resulting in a battery voltage dip if the battery pack 10 outputs only a small discharge current. Therefore, when the controller 15 detects that the battery voltage of the battery pack 10 is less than the second voltage threshold value within the second preset time period, it indicates that the battery pack is severely under-voltage and cannot be used normally, and the battery pack 10 should not be allowed to perform any charge and discharge operation, so that shutdown operation of the battery pack 10 is required to ensure the safety of the battery pack 10 and the equipment.
It should be noted that the second voltage threshold is generally smaller than the first voltage threshold, for example, the second voltage threshold may be an over-discharge safety voltage of the battery pack. When the battery pack voltage is lower than the overdischarge safety voltage, the battery pack is not allowed to work (including charging or discharging), otherwise, safety accidents are easy to occur.
It should be noted that, in some embodiments, when the under-voltage protection threshold of the battery pack 10 is 2.5V, the second preset duration may be 20s, the second voltage threshold may be 2.0V, and the preset shutdown condition includes: the battery voltage of the battery pack 10 is less than 2.0V within 20 s.
It is understood that the specific values of the second preset duration and the second voltage threshold may be set according to actual needs, for example, according to the type and capacity of the battery pack, which is not limited in this application.
In some embodiments, when it is detected that the battery voltage of the battery pack 10 satisfies the under-voltage protection condition, the charge/discharge control method provided in the embodiments of the present application includes steps S501 to S502. The following is a description with reference to fig. 1 and 2.
S501, the discharging switch is controlled to be turned off and the charging switch is kept turned on.
When the controller 15 detects that the battery voltage of the battery pack 10 satisfies the under-voltage protection condition, it is necessary to charge the battery pack 10 at this time and prohibit the battery pack 10 from discharging outside. Thus, the controller 15 turns off the discharge MOS transistor Q 2 And keep the charging MOS tube Q 1 And is turned on, and the battery pack 10 cannot be discharged to the outside.
S502, when the charging current is detected and the discharging switch meets the preset charging condition, the discharging switch is controlled to be conducted.
The controller 15 prohibits the battery pack 10 from discharging to the outside to disconnect the discharge MOS tube Q of the battery pack 10 2 And keep the charging MOS tube Q 1 After conducting, when the controller 15 detects the charging current and discharges the MOS transistor Q 2 When the preset charging condition is satisfied, it is explained that the power conversion apparatus 20 can charge the battery pack 10 after voltage-converting the input voltage of the power supply 40. Then control discharge MOS tube Q 2 Conduction is performed to prevent the charging current output by the power conversion device 20 from being discharged into the MOS transistor Q 2 Flows through the discharge MOS tube Q when closed 2 The body diode in the capacitor is used for generating a countering current to influence the charging efficiency. Therefore, the MOS transistor Q is turned on and discharged 2 Thereafter, the power conversion device 20 may normally charge the battery pack 10.
For example, referring to fig. 2, the preset charging condition is that the charging current is greater than the preset current value for a third preset period of time. At this time, the battery pack 10 is in charge, and the charging current outputted from the power conversion device 20 passes through the discharging MOS transistor Q 2 The body diode in the MOS transistor can cause discharge of the MOS transistor Q if the charging current is too large 2 Is broken down. For example, the preset current value is 3A, and the third preset time period is 10s. Therefore, when the charge current is detected to be kept at 3.3A within 10s, the discharge MOS tube Q is turned on 2 Charging the battery pack 10.
Illustratively, in some embodiments, the preset charging condition is that the temperature of the discharge switch 13 is greater than a preset temperature, for example, the preset temperature is 40 ℃, and when the temperature of the discharge MOS transistor Q2 is detected to be 45 ℃, the discharge switch is turned on to charge the battery pack.
An embodiment of the present application further provides a computer readable storage medium, where the computer readable storage medium stores a computer program, where the computer program includes program instructions, and the processor executes the program instructions to implement the steps of the method for controlling charge and discharge of a battery pack provided in the foregoing embodiment. For example, the computer program is loaded by a processor, the following steps may be performed:
and in a discharging state, when the battery voltage of the battery pack is detected to meet the under-voltage protection condition, accumulating the times of under-voltage protection in a first preset time period.
And setting a discharge inhibition flag bit if the undervoltage protection times reach preset times and the battery voltage is smaller than or equal to a first voltage threshold value.
When the discharge prohibition flag bit is set, a first control signal is sent to the power conversion equipment; the first control signal is for disabling the power conversion device from drawing power from the battery pack.
The computer readable storage medium may be an internal storage unit of the computer device of the foregoing embodiment, for example, a hard disk or a memory of the computer device. The computer readable storage medium may also be an external storage device of a computer device, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), etc. provided on the computer device.
Because the computer program stored in the computer readable storage medium can execute any of the charge control methods provided in the embodiments of the present application, the beneficial effects that can be achieved by any of the charge/discharge control methods of the battery pack provided in the embodiments of the present application can be achieved, which are detailed in the previous embodiments and are not described herein.
The foregoing embodiment numbers of the present application are merely for describing, and do not represent advantages or disadvantages of the embodiments. While the invention has been described with reference to certain preferred embodiments, it will be understood by those skilled in the art that various changes and substitutions of equivalents may be made and equivalents will be apparent to those skilled in the art without departing from the scope of the invention. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (10)
1. A charge-discharge control method of a battery pack, wherein the battery pack is externally discharged or charged through a power conversion device, the charge-discharge control method comprising:
under the discharging state, when the battery voltage of the battery pack is detected to meet the under-voltage protection condition, accumulating the times of under-voltage protection in a first preset time period;
setting a discharge inhibition zone bit if the undervoltage protection times reach preset times and the battery voltage is smaller than or equal to a first voltage threshold value;
when the discharge prohibition flag bit is set, a first control signal is sent to the power conversion equipment; the first control signal is for disabling the power conversion device from drawing power from the battery pack.
2. The charge-discharge control method according to claim 1, characterized by further comprising, after setting the discharge-inhibit flag bit:
acquiring the charge state of the battery pack when the discharge prohibition flag bit is set;
resetting the discharge inhibition zone bit and resetting the undervoltage protection times if the state of charge meets the discharge recovery condition;
and sending a second control signal to the power conversion device, and allowing the power conversion device to draw power from the battery pack.
3. The charge-discharge control method according to claim 1, characterized by further comprising, after setting the discharge-inhibit flag bit:
when the discharge prohibition flag is set, acquiring the battery voltage of the battery pack;
resetting the discharge inhibition zone bit and resetting the undervoltage protection times if the battery voltage meets the discharge recovery condition;
and sending a second control signal to the power conversion device, and allowing the power conversion device to draw power from the battery pack.
4. The charge-discharge control method according to claim 1, characterized in that the charge-discharge control method further comprises:
and when the discharge prohibition flag is set, if the battery voltage meets a preset shutdown condition, executing shutdown operation.
5. The charge-discharge control method according to claim 4, wherein the preset shutdown condition includes: the battery voltages are all less than a second voltage threshold for a second preset period of time.
6. The charge-discharge control method according to any one of claims 1 to 5, wherein the battery pack includes a charge switch and a discharge switch, and the method further comprises, when it is detected that the battery voltage of the battery pack satisfies an under-voltage protection condition:
controlling the discharging switch to be disconnected and keeping the charging switch to be connected;
and when the charging current is detected and the discharging switch meets the preset charging condition, controlling the discharging switch to be conducted.
7. The charge-discharge control method according to claim 6, wherein the preset charge condition includes: the charging current is greater than a preset current value and lasts for a third preset time period, or the temperature of the discharging switch is greater than a preset temperature.
8. A battery pack, characterized in that the battery pack comprises a battery, a charging switch, a discharging switch, a connection port and a controller, the battery is connected to the connection port through the charging switch and the discharging switch, the connection port is used for being connected with a power conversion device, a control end of the charging switch and the discharging switch is connected with the controller, and the controller is used for executing the battery pack charging and discharging control method according to any one of claims 1-7.
9. An energy storage system comprising the battery pack of claim 8 and a power conversion device further comprising a load interface for accessing a load to power the load and a charging interface for accessing a power supply to power the load and/or to charge the battery pack.
10. A computer-readable storage medium, on which a computer program is stored, characterized in that the computer program, when executed by a processor, implements the charge-discharge control method of the battery pack according to any one of claims 1 to 7.
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CN117394497A (en) * | 2023-10-31 | 2024-01-12 | 苏州海鹏科技有限公司 | Battery charge and discharge control method based on double-active-bridge energy storage system |
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Cited By (1)
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CN117394497A (en) * | 2023-10-31 | 2024-01-12 | 苏州海鹏科技有限公司 | Battery charge and discharge control method based on double-active-bridge energy storage system |
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