CN116317008A - Charge and discharge control method, energy storage device, energy storage system and storage medium - Google Patents
Charge and discharge control method, energy storage device, energy storage system and storage medium Download PDFInfo
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- 238000004146 energy storage Methods 0.000 title claims abstract description 497
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- 238000007599 discharging Methods 0.000 claims abstract description 96
- 238000004590 computer program Methods 0.000 claims description 4
- 230000002159 abnormal effect Effects 0.000 description 9
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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
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
- H02J7/0048—Detection of remaining charge capacity or state of charge [SOC]
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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
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
- H02J7/0014—Circuits for equalisation of charge between batteries
- H02J7/0016—Circuits for equalisation of charge between batteries using shunting, discharge or bypass circuits
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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
- H02J7/0063—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with circuits adapted for supplying loads from the battery
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
- H02J7/00714—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery charging or discharging current
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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
Abstract
The application provides a charge and discharge control method and related equipment, relates to the technical field of energy storage systems, and aims to solve the problem of how to switch energy storage equipment when the energy storage system is charged and discharged. The charge and discharge control method is applied to an energy storage system, the energy storage system comprises a plurality of energy storage devices, and the charge and discharge control method comprises the following steps: when the energy storage system is electrically connected with a power supply, detecting the output current of the energy storage system. And acquiring the charge states of all the energy storage devices in the energy storage system. And determining the working state of the energy storage system according to the output current, wherein the working state comprises a charging state or a discharging state. When the energy storage system is in a discharging state and the energy storage system is connected to a load, at least one target discharging device is determined from the energy storage system according to the charge states of the energy storage devices. And controlling the target discharging equipment to discharge.
Description
Technical Field
The application relates to the technical field of energy storage, in particular to a charge and discharge control method, energy storage equipment, an energy storage system and a storage medium.
Background
An energy storage system typically includes a plurality of energy storage devices connected in parallel. When the energy storage system is externally connected with a power supply for charging, the energy storage equipment with lower electric quantity can be switched to charge due to the fact that the charger is detected to be in place. When the energy storage system is connected to the load for discharging, the energy storage system can be switched to the energy storage equipment with higher electric quantity for discharging, so that the charging and discharging efficiency of the energy storage system is ensured.
However, if the energy storage system is connected to the load in the charging process, when the output power of the power supply is unstable or is connected to a high-power load, the energy storage system can discharge by using the energy storage device with lower electric quantity being charged due to the fact that the charger is detected to be in place, and the energy storage system cannot be switched to the energy storage device with higher electric quantity to discharge, so that the charging and discharging efficiency is lower.
Disclosure of Invention
In view of this, the present application provides a charge and discharge control method and related devices, which aim to solve the problem of how to switch energy storage devices when an energy storage system is charged and discharged.
The first aspect of the present application provides a charge-discharge control method, applied to an energy storage system, where the energy storage system includes a plurality of energy storage devices, the charge-discharge control method includes: when the energy storage system is electrically connected with a power supply, detecting the output current of the energy storage system. And acquiring the charge states of all the energy storage devices in the energy storage system. And determining the working state of the energy storage system according to the output current, wherein the working state comprises a charging state or a discharging state. When the energy storage system is in a discharging state and the energy storage system is connected to a load, at least one target discharging device is determined from the energy storage system according to the charge states of the energy storage devices. And controlling the target discharging equipment to discharge.
By adopting the charge and discharge control method of the embodiment, when the energy storage system is electrically connected with the power supply, the working state of the energy storage system is determined according to the output current of the energy storage system, so that the working state of the energy storage system can be accurately judged, and the energy storage system is considered to be in a charging state only because the charger is in place. When the energy storage system is in a discharging state according to the output current and the energy storage system is connected to a load, the situation that the energy storage system needs to discharge the load at the moment is described, so that at least one target discharging device can be determined from the energy storage system according to the charge states of all the energy storage devices, the target discharging device is controlled to discharge, and accordingly the corresponding target discharging device can be switched to discharge according to the working state of the energy storage system instead of using the charging energy storage device to discharge by default, the situation that the low-power energy storage device discharges and the high-power energy storage device is idle instead is avoided, and the charging and discharging efficiency of the energy storage system can be improved.
The second aspect of the application provides an energy storage device, which comprises a parallel port, a battery module and a controller, wherein the parallel port is used for being electrically connected with other energy storage devices to form an energy storage system; the controller performs the following operations: when the energy storage system is electrically connected with a power supply, detecting the output current of the energy storage system; acquiring the charge states of all energy storage devices in an energy storage system; determining the working state of the energy storage system according to the output current, wherein the working state comprises a charging state or a discharging state; when the energy storage system is in a discharging state and the energy storage system is connected to a load, determining at least one target discharging device from the energy storage system according to the charge states of the energy storage devices; and controlling the target discharging equipment to discharge.
A third aspect of the present application provides an energy storage system comprising a controller and a plurality of energy storage devices; the controller performs the following operations: when the energy storage system is electrically connected with a power supply, detecting the output current of the energy storage system; acquiring the charge states of all energy storage devices in an energy storage system; determining the working state of the energy storage system according to the output current, wherein the working state comprises a charging state or a discharging state; when the energy storage system is in a discharging state and the energy storage system is connected to a load, determining at least one target discharging device from the energy storage system according to the charge states of the energy storage devices; and controlling the target discharging equipment to discharge.
A fourth aspect of the present application provides a computer-readable storage medium storing a computer program or code that, when executed by a processor, implements the charge and discharge control method of the embodiments of the present application.
The fifth aspect of the present application provides a charge-discharge control apparatus, which is applied to an energy storage system, wherein the energy storage system includes a plurality of energy storage devices, and the charge-discharge control apparatus includes a current detection module, a state of charge detection module, a working state confirmation module, a target device confirmation module, and a charge-discharge module. The current detection module is used for detecting the output current of the energy storage system when the energy storage system is electrically connected with the power supply. The state of charge detection module is used for obtaining the state of charge of each energy storage device in the energy storage system. The working state confirmation module is used for determining the working state of the energy storage system according to the output current, wherein the working state comprises a charging state or a discharging state. The target device confirmation module is used for determining at least one target discharging device from the energy storage system according to the charge states of the energy storage devices when the energy storage system is in a discharging state and the energy storage system is connected to a load. The charging and discharging module is used for controlling the target discharging equipment to discharge.
It will be appreciated that the advantages of the second to fifth aspects described above may be found in the relevant description of the first aspect and are not repeated here.
Drawings
Fig. 1 is a schematic diagram of an application scenario of an energy storage system according to an embodiment of the present application.
Fig. 2 is a flowchart of a charge and discharge control method according to an embodiment of the present application.
Fig. 3 is a flowchart of a charge and discharge control method according to another embodiment of the present application.
Fig. 4 is a schematic structural diagram of a charge-discharge control device according to an embodiment of the present application.
Fig. 5 is a schematic structural diagram of an energy storage system according to an embodiment of the present application.
Detailed Description
It should be noted that the terms "first" and "second" in the specification, claims and drawings of this application are used for distinguishing between similar objects and not for describing a particular sequential or chronological order.
It should be further noted that the method disclosed in the embodiments of the present application or the method shown in the flowchart, including one or more steps for implementing the method, may be performed in an order that the steps may be interchanged with one another, and some steps may be deleted without departing from the scope of the claims.
Some embodiments will be described below with reference to the accompanying drawings. The following embodiments and features of the embodiments may be combined with each other without conflict.
Fig. 1 is a schematic diagram of an application scenario of an energy storage system according to an embodiment of the present application.
As shown in fig. 1, the energy storage system 10 is electrically connected to a power supply 20 and a load 30, the power supply 20 is used for charging the energy storage system 10, and the load 30 is used for receiving power from the energy storage system 10. The energy storage system 10 comprises at least a first energy storage device 1001 and a second energy storage device 1002, the first energy storage device 1001 and the second energy storage device 1002 being connected to each other by a parallel connection line or a parallel port (not shown). In an embodiment of the present application, it is assumed that the remaining power of the first energy storage device 1001 is higher than the remaining power of the second energy storage device 1002.
When the first energy storage device 1001 or the second energy storage device 1002 is electrically connected to the power supply 20, the energy storage system 10 detects that the charger is in place, and recognizes the working state as the charging state, and then switches to the second energy storage device 1002 with lower electric quantity by default for charging. When the power supply 20 charges the second energy storage device 1002, if the energy storage system 10 is connected to the load 30, the charging loop is closed after the output power of the power supply 20 is unstable, or the energy storage system 10 is fully charged, or the energy storage system 10 is set to have a charging input power (e.g. 100W) smaller than the discharging output power (e.g. 117W) required by the load 30, the energy storage system 10 actually enters a discharging state or a standby state, but the energy storage system 10 still can detect that the charger is in place, and then always considers that the current state is a charging state, and the second energy storage device 1002 with lower electric quantity is used for discharging, but cannot be switched to the first energy storage device 1001 with higher electric quantity for discharging, so that the charging and discharging efficiency is lower.
Based on the above, the application provides a charge and discharge control method and related equipment, so as to improve the charge and discharge efficiency of an energy storage system.
The charge and discharge control method according to the embodiment of the present application will be described below.
Fig. 2 is a flowchart of a charge and discharge control method according to an embodiment of the present application.
The charge and discharge control method is applied to an energy storage system that includes a plurality of energy storage devices, such as the energy storage system 10 shown in fig. 1. As shown in fig. 2, the charge and discharge control method may include the steps of:
s201, when the energy storage system is electrically connected with a power supply, detecting the output current of the energy storage system.
The output current of the energy storage system refers to the total output current of all energy storage devices in the energy storage system.
It will be appreciated that the output current of each energy storage device may be positive or negative depending on the specified current reference direction, which may be the direction of the charging current or the direction of the discharging current, the direction of the discharging current and the charging current being opposite. For example, assuming that the specified current reference direction is the direction of the charging current, the output current of the energy storage device is positive when the energy storage device is being charged; when the energy storage device is discharging, the output current of the energy storage device is negative. For another example, assuming that the specified current reference direction is the direction of the discharge current, the output current of the energy storage device is negative when the energy storage device is being charged; when the energy storage device is discharging, the output current of the energy storage device is positive. Generally, the current flowing into the energy storage device is defined as positive, i.e. the charging current; the current flowing out of the energy storage device is negative, i.e. the discharge current. The embodiments of the present application are exemplified with the charge current being positive and the discharge current being negative.
In this embodiment, when the energy storage system is electrically connected to the power supply, the energy storage system detects that the charger is in place, and further detects the output current of each energy storage device in the energy storage system, and calculates the total output current of all the energy storage devices, thereby obtaining the output current of the energy storage system.
S202, acquiring the charge states of all energy storage devices in the energy storage system.
The state of charge (StateofCharge, SOC) is used to represent the remaining capacity of the battery, i.e. the percentage of the remaining capacity to the rated capacity, and is usually in the range of 0 to 100%. In the embodiments of the present application, the terms "state of charge", "charge", or "remaining charge" are used interchangeably.
In this embodiment, the energy storage system may acquire the state of charge of each energy storage device in real time or periodically. Specifically, the SOC of the battery may be obtained by detecting electrical parameters of the battery, such as current, voltage, resistance, temperature, and the like. The method for calculating the state of charge is not limited, for example, an ampere-hour integration method, a kalman filter method, etc. in the related art can be adopted, and details are not described here.
S203, determining the working state of the energy storage system according to the output current, wherein the working state comprises a charging state or a discharging state.
In this embodiment, the energy storage system may determine whether the energy storage system is charging or discharging according to the detected output current, that is, the total output current of all the energy storage devices, so as to determine the working state of the energy storage system, so that the working state of the energy storage system can be accurately determined when the charger is detected to be in place, rather than default that the energy storage system is always in a charging state when the charger is in place.
Taking the direction of the specified current reference as the direction of the charging current as an example. When the discharging current of the energy storage system is smaller than the charging current, the output current of the energy storage system is a positive value, and the energy storage system is judged to be in a charging state at the moment. When the discharging current of the energy storage system is larger than the charging current, the output current of the energy storage system is negative, and the energy storage system is judged to be in a discharging state.
S204, when the energy storage system is in a discharging state and the energy storage system is connected to a load, determining at least one target discharging device from the energy storage system according to the charge states of the energy storage devices.
In this embodiment, when the energy storage system is in a discharging state, whether a load is connected is detected, and if the load is connected, at least one energy storage device is selected according to the charge state of each energy storage device, and the selected energy storage device is used as a target discharging device.
It will be appreciated that when any discharge interface in the energy storage system is electrically connected to a load, it may be detected whether the load is connected by in-situ detection of the discharge interface. In practical applications, the discharge interface may be provided on the energy storage device or on a power conversion device connected to the energy storage device.
In one embodiment, the state of charge of the target discharge device is greater than a preset threshold. The preset threshold is greater than the minimum state of charge in all of the energy storage devices and less than the maximum state of charge in all of the energy storage devices.
For example, assume an energy storage system includes a first energy storage device having a state of charge of 30%, a second energy storage device having a state of charge of 70%, and a third energy storage device having a state of charge of 90%, and a preset threshold of 50%. Because the state of charge of the first energy storage device is less than the preset threshold, the states of charge of the second energy storage device and the third energy storage device are both greater than the preset threshold, and therefore the energy storage system can take the second energy storage device or the third energy storage device as a target discharging device.
It can be understood that at this time, it may further be determined whether the voltage difference between the first energy storage device and the second energy storage device is within a preset voltage threshold, and if the voltage difference is within a preset range, the first energy storage device and the second energy storage device may be controlled to discharge simultaneously.
In another embodiment, the target discharge device is the most charged state energy storage device.
For example, assume an energy storage system includes a first energy storage device having a state of charge of 30%, a second energy storage device having a state of charge of 70%, and a third energy storage device having a state of charge of 90%. The energy storage system compares the charge states of the energy storage devices, and takes the third energy storage device with the largest charge state as the target discharging device.
S205, the target discharge device is controlled to perform discharge.
In this embodiment, after determining at least one target discharging device, the energy storage system cuts off the discharging loops of the other energy storage devices except the target discharging device and controls the target discharging device to discharge, so that the energy storage system can switch to the corresponding target discharging device to discharge according to the current working state of the energy storage system, instead of using the charging energy storage device to discharge by default, thereby improving the charging and discharging efficiency of the energy storage system.
It can be understood that in the process of controlling the target discharging device to discharge, the energy storage system can detect the output current of the energy storage system again, obtain the charge states of all the energy storage devices in the energy storage system, and determine the working state of the energy storage system according to the output current. When the energy storage system is in a discharging state and the energy storage system is connected to a load, at least one target discharging device is determined again from the energy storage system according to the charge states of the energy storage devices, and the target discharging device is controlled to discharge, so that the target discharging device can be updated instead of always using the target discharging device selected for the first time to discharge, the electric quantity of the energy storage devices is approximately balanced in the discharging process, and meanwhile, the discharging efficiency can be guaranteed to the greatest extent.
By adopting the charge and discharge control method of the embodiment, when the energy storage system is electrically connected with the power supply, the working state of the energy storage system is determined according to the output current of the energy storage system, so that the working state of the energy storage system can be accurately judged, and the energy storage system is considered to be in a charging state only because the charger is in place. When the energy storage system is in a discharging state according to the output current and the energy storage system is connected to a load, the situation that the energy storage system needs to discharge the load at the moment is described, so that at least one target discharging device can be determined from the energy storage system according to the charge states of all the energy storage devices, the target discharging device is controlled to discharge, and accordingly the corresponding target discharging device can be switched to discharge according to the working state of the energy storage system instead of using the charging energy storage device to discharge by default, the situation that the low-power energy storage device discharges and the high-power energy storage device is idle instead is avoided, and the charging and discharging efficiency of the energy storage system can be improved.
In some embodiments, the charge-discharge control method may further include: when the energy storage system is in a discharging state and the energy storage system is not connected to a load, the energy storage system outputs alarm prompt information.
The alarm prompt information is used for prompting the energy storage system to be abnormal. The alarm prompt information can be voice broadcast prompt information, sound and light flashing prompt information or be uploaded to a terminal device or a server which is in communication connection with the energy storage system so as to prompt a user that the energy storage system is in an abnormal state.
It can be understood that the energy storage system is in a discharging state and the energy storage system is not connected to a load, and the output current at the moment is a negative value, which indicates that a larger leakage current may exist, and the energy storage system is abnormal.
In the above embodiment, when the energy storage system is in a discharging state, whether the load is connected is detected, if the load is not connected, an alarm prompt message is output to prompt the energy storage system to be abnormal, so that a user can be timely reminded of carrying out abnormal processing, and the safety of the energy storage system is improved.
In other embodiments, an energy storage system determines an operating state of the energy storage system based on an output current, comprising: when the output current is less than the first current threshold, it is determined that the energy storage system is in a discharge state. And when the output current is greater than or equal to the second current threshold, determining that the energy storage system is in a charging state. Wherein the first current threshold is less than the second current threshold.
Assuming that the first current threshold is-1 ampere (a), the second current threshold is 0A. When the output current detected by the energy storage system is-2A, the energy storage system confirms that the discharge current is larger than the charging current because the output current is smaller than the first current threshold, so that the energy storage system judges that the energy storage system is discharging, and determines that the working state of the energy storage system is a discharging state. When the output current detected by the energy storage system is 1A, the energy storage system confirms that the discharge current is smaller than the charging current because the output current is larger than the second current threshold, so that the energy storage system determines that the energy storage system is in charging and determines that the working state of the energy storage system is in charging.
It is understood that the first current threshold may be determined by the maximum power consumption of the whole machine when the energy storage system is not loaded, and the second current threshold may be determined by the present power consumption of the energy storage system. In an embodiment, in order to ensure that the energy storage system can stably operate, the first current threshold may be set to a value lower than the output current corresponding to the maximum power consumption of the complete machine, for example, -1A, and the second current threshold may be set to 0A, that is, the charging state is determined when the output current is a positive value. The absolute value of the output current of the energy storage system is in positive correlation with the power consumption, and when the output power of the energy storage system is larger than the input power, the energy storage system is in a discharge state; when the input power of the energy storage system is greater than the output power, the energy storage system is in a charged state. For example, when the present power consumption of the energy storage system is 10 watts (W), the output current is about-200 milliamperes (mA); the current output of the energy storage system is about-400 mA when the current power consumption of the energy storage system is 20W. When the current power consumption of the energy storage system changes, the output current of the energy storage system also changes correspondingly, the output current needs to be detected again, and the working state of the energy storage system is judged again according to the output current. Therefore, when the power consumption of the energy storage system changes, the current threshold value is not changed according to the corresponding output current, and misjudgment is avoided.
In one embodiment, the charge and discharge control method may further include: when the output current is greater than or equal to the first current threshold and smaller than the second current threshold, the energy storage system is determined to be in a standby state, and the energy storage device with the charge state smaller than the preset threshold is closed.
The standby state refers to a state that the energy storage system is not charged or discharged, and the power consumption of the whole machine is small at the moment.
It can be understood that the output current is greater than or equal to the first current threshold and less than the second current threshold, which indicates that the output current is smaller, and if the load is connected, the problem that the load cannot be carried or the overload protection cannot be caused due to insufficient output capability occurs.
In the above embodiment, when the output current is greater than or equal to the first current threshold and less than the second current threshold, the energy storage system determines that the energy storage system is in the standby state and turns off the energy storage device with the charge state less than the preset threshold, so that the energy storage device with a lower electric quantity can be prevented from being used for discharging, and the stability of the energy storage device is improved.
In other embodiments, after determining the operating state of the energy storage system according to the output current, the charge-discharge control method may further include: when the energy storage system is in a charged state, at least one target charging device is determined from the energy storage system according to the charged state of each energy storage device. The target charging device is controlled to perform charging.
In the above embodiment, when the energy storage system is in a charging state, the energy storage system may select at least one of the energy storage devices according to the charging states of the energy storage devices, take the selected energy storage device as a target charging device, and then control the target charging device to charge, so that charging of the default discharging energy storage device can be avoided, and charging and discharging efficiency is improved.
In one embodiment, the state of charge of the target charging device is less than a preset threshold.
For example, assume an energy storage system includes a first energy storage device having a state of charge of 45%, a second energy storage device having a state of charge of 50%, and a third energy storage device having a state of charge of 70%, a preset threshold of 60%. Because the states of charge of the first energy storage device and the second energy storage device are smaller than the preset threshold, the state of charge of the third energy storage device is larger than the preset threshold, whether the voltage difference value of the first energy storage device and the second energy storage device is within the preset voltage threshold or not needs to be further judged at the moment, and if the voltage difference value is within the preset range, the first energy storage device and the second energy storage device are controlled to be charged simultaneously.
In another embodiment, the target charging device is an energy storage device having a minimum state of charge.
For example, assume an energy storage system includes a first energy storage device having a state of charge of 30%, a second energy storage device having a state of charge of 50%, and a third energy storage device having a state of charge of 70%, a preset threshold of 60%. The energy storage system compares the charge states of the energy storage devices, and takes the first energy storage device with the minimum charge state as the target charging device. And controlling the energy storage equipment with the electric quantity in the preset deviation threshold to charge until the electric quantity of the energy storage equipment and the electric quantity of other energy storage equipment are in the certain preset deviation threshold, so that the charging efficiency of the energy storage system can be improved.
It can be understood that in the process of controlling the target charging equipment to charge, the energy storage system can detect the output current of the energy storage system again, obtain the charge states of all the energy storage equipment in the energy storage system, and determine the working state of the energy storage system according to the output current. When the energy storage system is in a charging state, at least one target charging device is determined again from the energy storage system according to the charging states of the energy storage devices, and the target charging device is controlled to charge, so that the target charging device can be updated instead of always charging by using the target charging device selected for the first time, and the electric quantity balance of the energy storage devices is maintained in the charging process.
In other embodiments, the energy storage system calculates a deviation between the state of charge of the target charging device and the states of charge of the other energy storage devices when controlling the target charging device to charge. When the deviation is smaller than a preset deviation threshold, the energy storage system controls the target charging equipment and other energy storage equipment to charge until the electric quantity of all the energy storage equipment is full, so that the electric quantity balance of each energy storage equipment can be maintained in the charging process, and the charging efficiency of the energy storage system is improved. The preset deviation threshold may be set according to needs, for example, the preset deviation threshold may be set to 2%, 3% or 5%.
In other embodiments, the charge and discharge control method may further include: and acquiring load in-place states of a plurality of discharging interfaces of the energy storage system, wherein the discharging interfaces are used for being electrically connected with the load. And when the load of any discharge interface is in place, confirming that the energy storage system is connected to the load.
In this embodiment, when the energy storage system includes a plurality of energy storage devices, the energy storage devices may include discharge interfaces, and the obtaining of the load on-site states of the plurality of discharge interfaces of the energy storage system is the obtaining of the on-site states of the discharge interfaces of the energy storage devices. In another embodiment, a master device may be selected from a plurality of energy storage devices, and only the in-place status of a plurality of discharge interfaces of the master device may be acquired. In practical application, the energy storage system may include a plurality of battery packs and a power conversion device connected with the battery packs, where the power conversion device includes a plurality of discharge interfaces, and at this time, whether the energy storage system is connected to the load may be confirmed by acquiring an in-place state of the discharge interfaces on the power conversion device. .
In this embodiment, taking the in-place state of the discharge interface of the energy storage device as an example. The in-place state of the discharge interface of the energy storage device may be in-place or out-of-place. When the discharge interface of the energy storage device is electrically connected with the load, the energy storage device sets the in-place state of the discharge interface to in-place. When the discharge interface of the energy storage device is not electrically connected with the load, the energy storage device sets the in-place state of the discharge interface to be out of place.
In the above embodiment, the energy storage device may determine the on-site state of the discharge interface by detecting the voltage and current of the discharge interface or whether the corresponding pins are shorted, and then send the on-site state information of the discharge interface to the energy storage system. The energy storage system receives the in-place state information of the discharge interfaces of all the energy storage devices, and when the in-place state of the discharge interface of any energy storage device is in-place, the energy storage system can confirm that the discharge interface of any energy storage device is connected to the load.
For example, if the voltage of the discharge interface of the energy storage device is less than the preset voltage threshold, that is, the low level, the in-place state of the discharge interface is set to be out of place; when the voltage of the discharge interface of the energy storage device is greater than a preset voltage threshold, namely, a high level, the in-place state of the discharge interface is set to be in-place. When the energy storage device is connected to the load, the voltage of the discharge interface is converted from low level to high level, and the bit state of the discharge interface is set to be bit. The energy storage device may confirm whether the in-place state of the discharge interface is in place by detecting whether the voltage of the discharge interface is high. It will be appreciated that the high and low levels may be provided as desired. In other embodiments, it may be detected by other means whether the discharge interface of the energy storage device is in place, which is not limited herein.
For another example, when the energy storage device detects that the current of the discharge interface exceeds a preset current value, the in-place state of the discharge interface is set to in-place; when the energy storage device detects that the current of the discharge interface does not exceed the preset current value, the in-place state of the discharge interface is set to be out of place. When the energy storage device is connected to the load, the current of the discharge interface exceeds a preset current value, and the in-place state of the discharge interface is set to be in-place. It is understood that the preset current value may be set as desired.
In other embodiments, the energy storage system may confirm the in-place status of the discharge interfaces of the respective energy storage devices by detecting the voltage or current of the discharge interfaces of the respective energy storage devices. When the in-place state of the discharge interface of any energy storage device is in place, the energy storage system can confirm that the energy storage system is connected to the load.
In one embodiment, the charge and discharge control method may further include: and determining the working state of the energy storage system according to the in-place state of the discharge interface. And outputting alarm prompt information when the working state determined according to the in-place state of the discharge interface is inconsistent with the working state determined according to the output current.
The alarm prompt information is used for prompting the energy storage system to be abnormal.
In the above embodiment, the energy storage system determines its operating state according to the detected output current, and determines its operating state according to the in-place state of the discharge interface of each energy storage device. For example, when the output current is detected to be smaller than the first current threshold, the working state of the energy storage system is determined to be a discharge state at this time, but the in-place state of the discharge interface detected at this time is not in place, which means that the load is not connected at this time, and the energy storage system may have a larger leakage current. Therefore, when the working states determined in the two modes are inconsistent, the fact that the in-place state of the output current or the discharge interface of each energy storage device in the energy storage system is abnormal is indicated, and alarm prompt information is output at the moment to prompt the energy storage system to be abnormal, so that a user can be timely reminded of carrying out abnormal processing, and the safety of the energy storage system is improved.
Fig. 3 is a flowchart of a charge and discharge control method according to another embodiment of the present application.
As shown in fig. 3, the charge and discharge control method may include the steps of:
s301, detecting output current of the energy storage system when the energy storage system is electrically connected with a power supply.
S302, determining whether the output current is less than a first current threshold.
If the output current is less than the first current threshold, steps S303 to S305 are performed; if not, step S311 is performed.
S303, determining that the energy storage system is in a discharge state.
S304, acquiring the in-place state of the discharge interface of each energy storage device.
Wherein the discharge interface is used for being electrically connected with a load.
S305, determining whether an energy storage device with the in-place state of the discharge interface in place exists.
If there is an energy storage device with the in-place state of the discharge interface in place, executing steps S306 to S309; if not, step S310 is performed.
S306, confirming that the energy storage system is connected to the load.
S307, the charge states of all the energy storage devices in the energy storage system are obtained.
S308, determining at least one target discharging device from the energy storage system according to the charge states of the energy storage devices.
S309, the target discharge device is controlled to discharge.
S310, outputting alarm prompt information.
S311, it is determined whether the output current is greater than or equal to the second current threshold.
Wherein the first current threshold is less than the second current threshold.
If the output current is greater than or equal to the second current threshold, steps S312 to S315 are performed; if not, steps S316 to S317 are performed.
S312, it is determined that the energy storage system is in a charged state.
S313, acquiring the charge states of all the energy storage devices in the energy storage system.
S314, determining at least one target charging device from the energy storage system according to the charge states of the energy storage devices.
S315, the control target charging device performs charging.
S316, determining that the energy storage system is in a standby state.
And S317, closing the energy storage device with the charge state smaller than a preset threshold value.
In the above embodiment, when the energy storage system is electrically connected to the power supply, the working state of the energy storage system is determined according to the output current of the energy storage system, so that the working state of the energy storage system can be accurately determined, and the energy storage system is considered to be in a charging state only when the charger is in place. When the energy storage system is in a discharging state according to the output current and the energy storage system is connected to a load, the situation that the energy storage system needs to discharge the load at the moment is described, so that at least one target discharging device can be determined from the energy storage system according to the charge states of all the energy storage devices, the target discharging device is controlled to discharge, and accordingly the corresponding target discharging device can be switched to discharge according to the working state of the energy storage system instead of using the charging energy storage device to discharge by default, the situation that the low-power energy storage device discharges and the high-power energy storage device is idle instead is avoided, and the charging and discharging efficiency of the energy storage system can be improved.
Fig. 4 is a schematic structural diagram of a charge-discharge control device according to an embodiment of the present application.
As shown in fig. 4, the charge and discharge control apparatus 400 is applied to an energy storage system, the energy storage system includes a plurality of energy storage devices, and the charge and discharge control apparatus 400 includes a current detection module 401, a state of charge detection module 402, an operation state confirmation module 403, a target device confirmation module 404, and a charge and discharge module 405. The current detection module 401 is configured to detect an output current of the energy storage system when the energy storage system is electrically connected to the power supply. The state of charge detection module 402 is configured to obtain states of charge of the energy storage devices in the energy storage system. The operation state confirmation module 403 is configured to determine an operation state of the energy storage system according to the output current, where the operation state includes a charging state or a discharging state. The target device identification module 404 is configured to determine at least one target discharge device from the energy storage system based on the state of charge of each energy storage device when the energy storage system is in a discharge state and the energy storage system is connected to a load. The charge and discharge module 405 is used to control the target discharge device to perform discharge.
It will be appreciated that the above-described division of modules into a logical function division may be implemented in other ways. In addition, each functional module in each embodiment of the present application may be integrated in the same processing unit, or each module may exist alone physically, or two or more modules may be integrated in the same unit. The integrated modules may be implemented in hardware or in hardware plus software functional modules.
One embodiment of the present application also provides an energy storage device, as shown in fig. 5, an exemplary energy storage device 100 comprising: parallel port 110, controller 120, memory 130, and at least one battery module 140.
The parallel port 110 is used to provide a parallel function of the energy storage device 100, such as to connect with other energy storage devices or devices. Illustratively, as shown in fig. 5, the energy storage device 100 may be connected in parallel with the remaining energy storage devices 100 through a parallel port 110. The scene of charge and discharge control when a plurality of energy storage devices are connected in parallel is realized.
The controller 120 establishes a connection with each battery pack. It should be noted that the controller 120 may be in the energy storage device 100, or may be other than the energy storage device 100, for example, the controller 120 is disposed in the rest of the devices that are incorporated through the parallel port 110. When the controller 120 is disposed in the storage device 100, the controller 120 is not only connected to each battery pack 140 in the energy storage device 100, but also connected to the incorporated energy storage device or other incorporated devices through the parallel port 110. When the controller 120 is disposed outside the energy storage devices 100, the controller 120 is connected to each energy storage device 100 through the parallel port 110.
The controller 120 may be a central processing unit (central processing unit, CPU), but may also be other general purpose processors, digital signal processors (digital signal processor, DSP), application specific integrated circuits (application specific integrated circuit, ASIC), field programmable gate arrays (field programmable gate array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or the like. A general purpose processor may be a microprocessor or any conventional processor or the like.
The memory 130 stores computer readable instructions, and is connected to the controller 120, where the computer readable instructions, when executed by the controller 120, cause the energy storage device to implement the charge and discharge control method provided in the foregoing embodiments, so as to ensure that the problem of battery pack overcurrent does not occur in the parallel charging process.
It is understood that the Memory is, for example, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-Only Memory (ROM), an erasable programmable read-Only Memory (Erasable Programmable Read Only Memory, EPROM), a flash Memory, an optical fiber, a portable compact disc read-Only Memory (CD-ROM), an optical storage device, a magnetic storage device, etc., and the present embodiment is not limited herein.
Fig. 5 is a schematic structural diagram of an energy storage system according to an embodiment of the present application.
Some embodiments of the present application also provide an energy storage system comprising at least two energy storage devices connected through a parallel port, at least one of the energy storage devices being an energy storage device as described above. Still referring to fig. 5, two energy storage devices 100 are connected through respective parallel ports 110, and the two energy storage devices are connected in parallel to form an energy storage system. At this time, the controller 120 of any one of the energy storage devices 100 may be selected as a main controller, performing the charge and discharge control method as described above.
It will be appreciated that the configuration illustrated in fig. 5 does not constitute a particular limitation on the energy storage system and the energy storage device. In other embodiments, the energy storage system and energy storage device may include more or less components than illustrated, or certain components may be combined, or certain components may be split, or different arrangements of components.
The present application also provides a computer readable storage medium storing a computer program or code which, when executed by a processor, implements the steps of the above-described method embodiments, such as fig. 2 and 3.
Computer-readable storage media include volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer-readable instructions, data structures, program modules or other data. Computer-readable storage media includes, but is not limited to, random access Memory (Random Access Memory, RAM), read-Only Memory (ROM), electrically-charged erasable programmable Read-Only Memory (EEPROM), flash Memory or other Memory, compact disk Read-Only Memory (CD-ROM), digital versatile disks (Digital Versatile Disc, DVD) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can be accessed by a computer.
Finally, it should be noted that the above embodiments are merely for illustrating the technical solution of the present application and not for limiting, and although the present application has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solution of the present application may be modified or substituted without departing from the spirit and scope of the technical solution of the present application.
Claims (10)
1. A charge-discharge control method applied to an energy storage system including a plurality of energy storage devices, the method comprising:
when the energy storage system is electrically connected with a power supply, detecting the output current of the energy storage system;
acquiring the charge states of all the energy storage devices in the energy storage system;
determining the working state of the energy storage system according to the output current, wherein the working state comprises a charging state or a discharging state;
when the energy storage system is in a discharging state and the energy storage system is connected to a load, determining at least one target discharging device from the energy storage system according to the charge states of the energy storage devices;
and controlling the target discharge equipment to discharge.
2. The charge-discharge control method according to claim 1, characterized in that the method further comprises:
and when the energy storage system is in a discharging state and the energy storage system is not connected to a load, outputting alarm prompt information.
3. The charge-discharge control method of claim 1, wherein the determining the operating state of the energy storage system from the output current comprises:
when the output current is smaller than a first current threshold value, determining that the energy storage system is in a discharge state;
when the output current is greater than or equal to a second current threshold, determining that the energy storage system is in a charged state;
wherein the first current threshold is less than the second current threshold.
4. The charge-discharge control method according to claim 3, characterized in that the method further comprises:
and when the output current is greater than or equal to the first current threshold and smaller than the second current threshold, determining that the energy storage system is in a standby state, and closing the energy storage device with the charge state smaller than a preset threshold.
5. The charge-discharge control method according to claim 1, wherein after determining the operating state of the energy storage system from the output current, the method further comprises:
determining at least one target charging device from the energy storage system according to the state of charge of each energy storage device when the energy storage system is in a state of charge;
and controlling the target charging equipment to charge.
6. The charge-discharge control method according to claim 1, characterized in that the method further comprises:
acquiring load on-site states of a plurality of discharge interfaces of the energy storage system; the discharge interface is used for being electrically connected with the load;
and when the load of any discharge interface is in place, confirming that the energy storage system is connected to the load.
7. The charge-discharge control method according to claim 6, characterized in that the method further comprises:
determining the working state of the energy storage system according to the in-place state of the discharge interface;
and outputting alarm prompt information when the working state determined according to the in-place state of the discharge interface is inconsistent with the working state determined according to the output current.
8. The energy storage device is characterized by comprising a parallel connection port, a battery module and a controller, wherein the parallel connection port is used for being electrically connected with other energy storage devices to form an energy storage system; the controller performs the following operations:
detecting an output current of the energy storage system;
acquiring the charge states of all the energy storage devices in the energy storage system;
determining the working state of the energy storage system according to the output current, wherein the working state comprises a charging state or a discharging state;
when the energy storage system is in a discharging state and the energy storage system is connected to a load, determining at least one target discharging device from the energy storage system according to the charge states of the energy storage devices;
and controlling the target discharge equipment to discharge.
9. An energy storage system, the energy storage system comprising a controller and a plurality of energy storage devices; the controller performs the following operations:
detecting an output current of the energy storage system;
acquiring the charge states of all the energy storage devices in the energy storage system;
determining the working state of the energy storage system according to the output current, wherein the working state comprises a charging state or a discharging state;
when the energy storage system is in a discharging state and the energy storage system is connected to a load, determining at least one target discharging device from the energy storage system according to the charge states of the energy storage devices;
and controlling the target discharge equipment to discharge.
10. A computer-readable storage medium storing a computer program or code, wherein the computer program or code, when executed by a processor, implements the charge-discharge control method according to any one of claims 1 to 7.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116846047A (en) * | 2023-09-01 | 2023-10-03 | 杭州协能科技股份有限公司 | Battery cluster parallel system and control method and device for charging and discharging processes of battery cluster parallel system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116846047A (en) * | 2023-09-01 | 2023-10-03 | 杭州协能科技股份有限公司 | Battery cluster parallel system and control method and device for charging and discharging processes of battery cluster parallel system |
| CN116846047B (en) * | 2023-09-01 | 2023-11-14 | 杭州协能科技股份有限公司 | Battery cluster parallel system and control method and device for charging and discharging processes of battery cluster parallel system |
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