CN117674331A - Energy storage battery system, control method thereof, controller and storage medium - Google Patents
Energy storage battery system, control method thereof, controller and storage medium Download PDFInfo
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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
Abstract
The invention discloses an energy storage battery system, a control method, a controller and a storage medium thereof, wherein the energy storage battery system comprises a conversion unit and a plurality of battery units, the conversion unit is respectively connected with the plurality of battery units in strong electricity, a first controller of the conversion unit is respectively connected with a second controller of the plurality of battery units in weak electricity, and controllers of two adjacent battery units are connected in weak electricity.
Description
Technical Field
The application relates to the field of power electronics, in particular to an energy storage battery system, a control method thereof, a controller and a storage medium.
Background
In the current energy storage battery system formed by a plurality of battery units in parallel connection and matching with a conversion unit, the switches of the battery units are mutually independent, and when the energy storage battery system performs charge and discharge application on the battery units, a user is required to independently press the switches of the battery units to perform on-off control on the battery units;
in the process of installing or using the energy storage battery system, as the switches of all the battery units are mutually independent, when partial switches are touched by mistake or the time for on-off control is inconsistent, the charging states of the partial battery units and the charging states of the energy storage battery system are asynchronous, so that the problems that the energy storage battery system cannot be normally opened and shut down and the impact current in the circuit of the energy storage battery system is overlarge are solved, and the reliability and the safety of the energy storage battery system are affected.
Disclosure of Invention
The application provides an energy storage battery system and a control method, a controller and a storage medium thereof, which can at least ensure that in the installation or use process of the energy storage battery system, a plurality of battery units of the energy storage battery system can be synchronously controlled, the occurrence of the condition of overlarge impact current in a circuit of the energy storage battery system is avoided, and the reliability and the safety of the energy storage battery system are further improved.
An embodiment of the first aspect of the present invention provides an energy storage battery system, including a conversion unit and a plurality of battery units, where the conversion unit is respectively connected with the plurality of battery units in strong current, a first controller of the conversion unit is respectively connected with a second controller of the plurality of battery units in weak current, and controllers of two adjacent battery units are connected in weak current;
the second controller is used for acquiring on-off state signals sent by the second controllers of other battery units according to the first signals sent by the first controller, and controlling the battery units corresponding to the second controller according to the on-off state signals.
The energy storage battery system according to the embodiment of the first aspect of the invention has at least the following beneficial effects: the method comprises the steps that on-off state signals sent by other second controllers of battery units are obtained according to first signals sent by a first controller, and battery units corresponding to the second controllers are controlled according to the on-off state signals, wherein the energy storage battery system comprises a conversion unit and a plurality of battery units, the conversion unit is respectively connected with the plurality of battery units in a strong electric mode, the first controllers of the conversion unit are respectively connected with the plurality of second controllers of the battery units in a weak electric mode, and the controllers of the two adjacent battery units are connected in a weak electric mode, so that the energy storage battery system can synchronously control the plurality of battery units, the occurrence of overlarge impact current in a circuit of the energy storage battery system is avoided, and the reliability and the safety of the energy storage battery system are improved.
In some embodiments, when the on-off state signal indicates that a plurality of battery cells in an on state exist in the plurality of battery cells, the second controller is configured to obtain a current value of the battery cells in the on state, and control the battery cells in the on state to be turned off according to the current value.
In some embodiments, the second controller is configured to send a second signal to the first controller when the current value is greater than zero, so that the first controller controls the output power of the conversion unit to be zero according to the second signal, and the second controller is further configured to control the battery unit in the on state to be turned off when the output power of the conversion unit is zero.
In some embodiments, when the on-off state signal indicates that the plurality of battery units are in the off state, the second controller is configured to obtain a voltage difference value between any two battery units in the plurality of battery units, and control the battery units to be turned on according to the voltage difference value.
In some embodiments, the second controller is configured to adjust the current value of the battery cell such that the voltage difference is less than or equal to the voltage difference threshold if the voltage difference is greater than the voltage difference threshold.
In some embodiments, the second controller is configured to determine the voltage difference threshold from an over-current threshold of the battery cell and a corresponding current loop resistance value, the over-current threshold being indicative of a maximum rush current of the battery cell.
An embodiment of the second aspect of the present invention provides a control method of an energy storage battery system, where the energy storage battery system includes a conversion unit and a plurality of battery units, the conversion unit is respectively connected with the plurality of battery units in strong current, a first controller of the conversion unit is respectively connected with a second controller of the plurality of battery units in weak current, and controllers of two adjacent battery units are connected in weak current, and the method includes:
acquiring on-off state signals sent by the second controllers of other battery units according to the first signals sent by the first controllers;
and controlling the battery unit corresponding to the second controller according to the on-off state signal.
In some embodiments, the controlling the battery unit corresponding to the second controller according to the on-off state signal includes:
under the condition that the on-off state signal represents that a plurality of battery units in an on-state exist in the battery units, acquiring a current value of the battery units in the on-state;
And controlling the battery unit in the starting state to be shut down according to the current value.
In some embodiments, the controlling the battery unit in the on state according to the current value includes:
transmitting a second signal to the first controller to cause the first controller to control the output power of the conversion unit to zero according to the second signal when the current value is greater than zero;
and controlling the battery unit in the starting-up state to be shut down.
In some embodiments, the controlling the battery unit corresponding to the second controller according to the on-off state signal includes:
under the condition that the on-off state signal represents that the plurality of battery units are in an off state, acquiring a voltage difference value between any two battery units in the plurality of battery units;
and controlling the battery unit to start according to the voltage difference value.
In some embodiments, the controlling the battery unit to start up according to the voltage difference value includes:
and when the voltage difference value is larger than a voltage difference threshold value, adjusting the current value of the battery unit so that the voltage difference value is smaller than or equal to the voltage difference threshold value.
In some embodiments, the method for determining the voltage difference threshold includes:
and determining the voltage difference threshold according to the over-current threshold and the corresponding current loop resistance value of the battery unit, wherein the over-current threshold represents the maximum impact current of the battery unit.
An embodiment of a third aspect of the present invention provides a controller, including a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the method for controlling the energy storage battery system according to any one of the second aspects when the processor executes the computer program.
An embodiment of the fourth aspect of the present invention provides a computer-readable storage medium storing computer-executable instructions for performing the method for controlling the energy storage battery system according to any one of the embodiments of the second aspect.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description and drawings.
Drawings
Fig. 1 is a schematic diagram of an energy storage battery system according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a communication port in an energy storage battery system according to an embodiment of the present invention;
fig. 3 is a flowchart of a control method of an energy storage battery system according to an embodiment of the present invention;
fig. 4 is a flowchart of a control method of the energy storage battery system according to the embodiment of the present invention, where the control method controls a battery unit corresponding to the second controller according to the on-off state signal;
fig. 5 is a flowchart of a control method of an energy storage battery system according to an embodiment of the present invention, wherein the control method controls a battery unit in a power-on state to be powered off according to the current value;
fig. 6 is a flowchart of a control method of the energy storage battery system according to the embodiment of the present invention, where the control method controls a battery unit corresponding to the second controller according to the on-off state signal;
fig. 7 is a flowchart of controlling the battery unit to start according to the voltage difference in the control method of the energy storage battery system according to the embodiment of the present invention;
FIG. 8 is a diagram illustrating an example of a control method of an energy storage battery system in the case where the start switch is a reset switch according to an embodiment of the present invention;
FIG. 9 is a diagram illustrating an example of a control method of an energy storage battery system in the case where the start switch is a self-locking switch according to an embodiment of the present invention;
fig. 10 is a schematic structural diagram of a controller according to an embodiment of the present invention.
Reference numerals: 1. a conversion unit; 2. a battery unit; 3. a communication port; 4. the switch is activated.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention. Furthermore, the described features, operations, or characteristics of the description may be combined in any suitable manner in various embodiments. Also, various steps or acts in the method descriptions may be interchanged or modified in a manner apparent to those of ordinary skill in the art. Thus, the various orders in the description and drawings are for clarity of description of only certain embodiments, and are not meant to be required orders unless otherwise indicated.
In the description of the present invention, a number means one or more, a number means two or more, and greater than, less than, exceeding, etc. are understood to not include the present number, and above, below, within, etc. are understood to include the present number. The description of the first and second is for the purpose of distinguishing between technical features only and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
The numbering of the components itself, e.g. "first", "second", etc., is used herein merely to distinguish between the described objects and does not have any sequential or technical meaning. The terms "coupled" and "connected," as used herein, are intended to encompass both direct and indirect coupling (coupling), unless otherwise indicated.
In the description of the present invention, unless explicitly defined otherwise, terms such as arrangement, installation, connection, etc. should be construed broadly and the specific meaning of the terms in the present invention can be reasonably determined by a person skilled in the art in combination with the specific contents of the technical scheme.
In the related art, in the scheme of connecting a plurality of batteries in parallel and adding a direct current converter-shaped energy storage system, each battery is provided with a switch and a group of state displays (such as an SOC and an alarm), when the system is to be started, each battery needs to be started by pressing the switch independently, after the startup is completed, the system is connected in parallel, when the system is shut down, each battery needs to be pressed down, the system is more complicated, because each battery is provided with the switch, when the plurality of batteries are connected in parallel, the switch is possibly pressed down by mistake in the installation process, so that part of the batteries are in an electrified installation state, and high-current impact risks occur, thereby the phenomenon of spark emission occurs, and the problem of short-circuit protection occurs to the batteries.
Based on the above situation, the embodiment of the invention provides an energy storage battery system, a control method, a controller and a storage medium thereof, which can acquire a switching on/off state signal sent by a second controller of other battery units according to a first signal sent by a first controller, and control the battery unit corresponding to the second controller according to the switching on/off state signal.
Embodiments of the present invention will be further described below with reference to the accompanying drawings.
As shown in fig. 1, fig. 1 is a schematic diagram of an energy storage battery system provided in an embodiment of the present invention, in some embodiments, the energy storage battery system includes a conversion unit 1 and a plurality of battery units 2, the conversion unit 1 is connected with the plurality of battery units 2 in strong electricity, a first controller of the conversion unit 1 is connected with a second controller of the plurality of battery units 2 in weak electricity, and controllers of two adjacent battery units 2 are connected in weak electricity; the second controller is configured to obtain a power-on/off state signal sent by the second controller of the other battery units 2 according to the first signal sent by the first controller, and control the battery unit 2 corresponding to the second controller according to the power-on/off state signal.
In some embodiments, referring to fig. 1, the conversion unit 1 in fig. 1 is a dc converter, which is a power electronic device that converts dc power into voltage or current-controllable dc power required by a load, and can implement adjustment of an average value of output voltage, and then obtain current or voltage-controllable dc power on the controlled load through filtering of an output filter, so as to provide current values for a plurality of battery units 2.
In some embodiments, the positive and negative electrodes of the dc converter are connected to the positive and negative electrodes of the plurality of batteries, the communication port 3 of the dc converter is connected to the communication port 3 of the plurality of batteries, the communication port 3 of the dc converter is connected to the start switch 4 of the dc converter, the plurality of batteries are respectively provided with a battery management system, the communication port 3 of the plurality of batteries is connected to the battery management system, the positive and negative electrodes of the plurality of batteries are connected in parallel, the plurality of batteries receive and send start signals of the start switch 4 through the communication port 3, the battery management system is used for obtaining a voltage difference between the plurality of batteries according to a voltage value of the plurality of batteries when the battery management system receives the start signals, the battery management system is used for controlling the plurality of batteries to start up when the voltage difference is smaller than or equal to a voltage difference threshold, or the battery management system is used for controlling the plurality of batteries to be in a current limiting state and to process when a maximum voltage difference among the plurality of voltage differences between the batteries is larger than the voltage difference threshold, the battery management system is used for controlling the plurality of batteries to be in a current limiting state and controlling the dc converter to process, the current limiting state is controlled to be in a state that the preset value is smaller than the voltage difference threshold, and the energy storage system is prevented from being in a state that the energy storage system is large, and the reliability of the system is improved.
In some embodiments, the first controller is configured to control the dc converter to send control signals to the plurality of battery units 2 and supply power to the plurality of battery units 2, and the second controller is a battery management system, and is configured to control the corresponding battery units 2 to perform switching on/off processing and control charging/discharging currents of the corresponding battery units 2, and communicate with the battery management system of other battery units 2 through weak electrical connection, so as to obtain a current value of the battery unit 2 in a power-on state, and control the battery unit 2 in the power-on state according to the current value to power off, so as to avoid occurrence of an excessive impact current in a circuit of the energy storage battery system, where the current value may be either a charging current value or a discharging current value.
In some embodiments, the communication ports 3 of the dc converters are connected to the communication ports 3 of the plurality of batteries through a communication line, the communication ports 3 between the communication ports 3 of the plurality of batteries are connected through a communication line, the communication line is used for transmitting weak signals such as control signals, that is, a first controller of the dc converter is respectively connected with a second controller of the plurality of battery units 2 through weak electricity of the communication line, the controllers of two adjacent battery units 2 are connected through weak electricity of the communication line, meanwhile, the dc converters are connected with the positive poles and the negative poles of the plurality of battery units 2 through high voltage lines in a strong electricity manner, after the dc converters are connected to the high voltage bus, the dc converters supply or discharge power to the plurality of battery units 2 connected in parallel through the high voltage lines while controlling current and voltage power, and charge and discharge applications of the plurality of battery units 2 are achieved.
In some embodiments, the plurality of groups of battery units 2 and the direct current converter are connected to the high-voltage bus after being physically connected to the high-voltage line through a communication line. In a normal state, the high-voltage bus is provided with high-voltage electricity, and can drive the auxiliary power supply of the direct-current converter to work, so that the direct-current converter works, the direct-current converter provides output voltage to charge the battery, the battery is activated, or the direct-current converter sends a starting instruction to the battery, and the battery starts to work normally. When an abnormal state occurs: if the high-voltage bus is not powered, and the battery is in a dormant or shutdown state at present, the system is required to work, and obviously, the direct-current converter cannot charge the battery to activate the battery, and cannot send a communication signal to start the battery. In the scheme, a switch key is added to play a role of activating the battery by hardware, the switch signal can reach all the batteries at the same time, the batteries mutually judge respective states (SOC, voltage, temperature and the like) after receiving the switch signal, and when the state differences of the batteries are large, the mutual current impact is avoided, and the starting action is orderly carried out.
Fig. 2 is a schematic diagram of a communication port in an energy storage battery system according to an embodiment of the present invention, where the communication port is a serial communication port COM, and is used for transmitting a start signal for starting a switch and a communication signal for the dc converter between a plurality of groups of battery units and the dc converter, and transmitting communication signals for obtaining current parameters, voltage parameters, and on-off states between the plurality of groups of battery units, and the communication port includes N PINs (PIN 1 to PINn), and PINs 1 to PINn are specifically defined as shown in the following table (1):
Watch (1)
In some examples, referring to table (1), two pins of the communication port are connected to the switch signal, the two pins of the dc converter are respectively connected to the switch and the control port on the control motherboard, and the two pins of the battery terminal are connected to the hardware wake-up port on the battery management system. The switch pins CAN also be independently arranged without multiplexing with the communication ports, and the related art CAN be arranged according to actual conditions, and the communication protocols used by the pins for data communication in the communication ports include but are not limited to CAN, RS485, URAT or a plurality of communication modes combined use communication modes, and the related art CAN also be arranged according to actual conditions.
In some embodiments, the second controller is configured to send a second signal to the first controller when the current value is greater than zero, so that the first controller controls the output power of the conversion unit to be zero according to the second signal, and is further configured to control the battery unit in the on state to be turned off when the output power of the conversion unit is zero.
In some embodiments, in a case that the on-off state signal indicates that a battery unit in an on-state exists in the plurality of battery units, the second controller is configured to obtain a current value of the battery unit in the on-state, and control the battery unit in the on-state to be turned off according to the current value.
In some embodiments, the second controller is configured to send a second signal to the first controller when the current value is greater than zero, and the second controller is configured to control the battery unit in the on state to be turned off when the first controller controls the output power of the conversion unit to be zero according to the second signal.
In some embodiments, the start switch includes a reset switch and a self-locking switch, when the start switch is the reset switch, after the button is pressed for more than 3S, the battery BMS confirms that there is a start-up or shutdown requirement, each battery first confirms what state the other side is in, and when the battery is in the start-up state, all batteries execute shutdown operation; when all the batteries are in a shutdown state, executing startup operation; when the starting operation is executed, the states are read from each other, corresponding voltages are compared, if the voltage difference between the batteries is larger than a voltage difference threshold value, the battery starts a charging current limiting function, then starting is executed, and meanwhile, when the voltages are finally equal, the charging current limiting function can be closed, so that the energy storage battery system can synchronously control a plurality of battery units, the starting and shutting times of the battery units are unified, the safety problems caused by incapability of starting or shutting down and overlarge impact current due to inconsistent starting and shutting times of the battery units are avoided, and the reliability and safety of the energy storage battery system are further improved.
In some embodiments, the second controller is configured to obtain a voltage difference between any two battery units in the plurality of battery units, and when the voltage difference is greater than a voltage difference threshold, the charging current limiting function is started according to the voltage difference, where the charging current limiting function is that when the voltage difference between the plurality of battery units is greater than the voltage difference threshold, the second controller is configured to control the battery units to start up and operate with a current value smaller than a preset current threshold, and adjust the current value of the battery units so that the voltage difference is smaller than or equal to the voltage difference threshold, thereby avoiding occurrence of an excessive impact current in a circuit of the energy storage battery system, protecting the energy storage battery system, and limiting current from flowing out infinitely so as to prevent the energy storage battery system from being damaged, and further improving reliability and safety of the energy storage battery system.
In some embodiments, the starting switch includes a reset switch and a self-locking switch, and when the starting switch is the self-locking switch, after the switch is closed, the battery management system of the battery unit confirms the starting, executes the starting operation, reads the states from each other, compares the corresponding voltages, if the voltage difference between the batteries is larger than the voltage difference threshold, the battery starts the charging current limiting function, and then executes the starting. The final equality of the voltages is a charge current limiting function that can be turned off. When the switch is turned off, the battery reads the current state, when the current is not 0, the battery control unit issues a stop work instruction to the direct current converter, and when the battery current is 0, the power-off operation is executed, so that the energy storage battery system can synchronously control a plurality of battery units, the on-off time of the plurality of battery units is unified, the problem that the power-on or the power-off cannot be performed due to the fact that the on-off time of the plurality of battery units is inconsistent is avoided, and the reliability and the safety of the energy storage battery system are further improved.
In some embodiments, the second controller is configured to determine a voltage difference threshold according to an overcurrent threshold of the battery unit and a corresponding current loop resistance value, where the overcurrent threshold represents a maximum impact current that can be tolerated by the battery unit, the voltage difference threshold uset=the overcurrent threshold i×the current loop resistance Rt, I is an overcurrent threshold (less than a maximum value of an overcurrent protection value of the battery unit) that can be accepted by the battery unit, and Rt is a sum of internal resistances of a battery and a connection line in a current loop corresponding to the battery unit.
In some embodiments, the calculation formula of the differential pressure threshold Uset of each battery when the circulation is started is Δu=the conversion coefficient k×the overcurrent threshold i×u, and the acceptable overcurrent threshold I of the battery, where I is smaller than the minimum value of the sustainable current of the battery management system, the sustainable current of the battery and the sustainable mature current of the corresponding cable, rt is the equivalent internal resistance of the battery+the resistance value of the battery management system+the total resistance value of the cable resistance+the contact resistance, and k is the conversion coefficient corresponding to the conversion technology adopted.
As shown in fig. 3, fig. 3 is a flowchart of a control method of an energy storage battery system according to the present embodiment, where the control method of the energy storage battery system according to the embodiment of the present invention includes, but is not limited to, step S310 and step S320.
Step S310, acquiring on-off state signals sent by second controllers of other battery units according to first signals sent by the first controllers;
step S320, the battery unit corresponding to the second controller is controlled according to the on-off state signal.
In some embodiments, the energy storage battery system includes a conversion unit and a plurality of battery units, the conversion unit is connected with the plurality of battery units in a strong current manner, a first controller of the conversion unit is connected with a second controller of the plurality of battery units in a weak current manner, controllers of two adjacent battery units are connected in a weak current manner, a switching-on/off state signal sent by a second controller of other battery units is obtained according to a first signal sent by the first controller, the battery units corresponding to the second controller are controlled according to the switching-on/off state signal, the switching-on/off states of the plurality of battery units can be synchronous, and the problem that the user experience and the safety problem cannot be influenced due to the fact that part of the charging states of the battery units are not synchronous with the charging states of the energy storage battery system in the installation or use process of the energy storage battery system is prevented, and the reliability and the safety of the system are improved.
In some embodiments, referring to fig. 1, a plurality of battery units are connected in parallel, so that a second controller can synchronously receive a first signal of a conversion unit through a communication port, wherein the first signal is a power-on signal of an energy storage battery system sent after a start switch on the conversion unit is triggered, and the second controller is a battery management system, and the start switch comprises a reset switch and a self-locking switch.
In some embodiments, in the energy storage battery system, the existing battery activation mode only has charging activation and communication activation, when the battery is in a shutdown state and the converter is in a state that power cannot be supplied (the auxiliary battery cannot supply power), the battery cannot be simply started from the upper surface of the converter, so that the control method of the energy storage battery system of the application obtains the on-off state signals sent by the second controllers of other battery units according to the first signals sent by the first controllers, and controls the battery units corresponding to the second controllers according to the on-off state signals, so that the energy storage battery system can synchronously control a plurality of battery units, the on-off time of the battery units is unified, and the safety problems caused by incapability of starting up or shutting down and overlarge impact current due to inconsistent on-off time of the battery units are avoided, thereby improving the reliability and safety of the energy storage battery system.
In some embodiments, because the energy storage battery system of the application synchronously controls the plurality of battery units, namely, the plurality of groups of batteries adopt a single-way general switch, shutdown operation is performed on the energy storage battery system before shipment of the energy storage battery system, and shutdown processing is performed on the energy storage battery system under the condition that the startup state of the energy storage battery system exceeds 5 hours without liability and communication, the energy storage battery system of the application can not touch an independent switch on the battery by mistake in the installation process, so that the battery is started, electrified installation occurs, the problem of potential safety hazards exists, and the safety of the energy storage battery system is improved.
In some examples, referring to fig. 1, since only one starting switch is provided in the whole system, a plurality of groups of batteries are started simultaneously, so that the direct current converter is convenient to calculate the combination parameters, and therefore a unified state is provided, the starting action is performed only once, the battery starting omission can be effectively avoided, the plurality of battery units are not provided with the switches, the waterproof treatment is simpler, the surface of the battery unit box body is more attractive, meanwhile, the state identification is not required due to the fact that the batteries are provided with the switches, the overall cost is reduced, and the problem of light pollution is avoided.
As shown in fig. 4, fig. 4 is a flowchart of controlling a battery unit corresponding to a second controller according to a power-on/off state signal in the control method of the energy storage battery system according to the embodiment of the present invention, where the control method of the energy storage battery system of the embodiment of the present invention includes, but is not limited to, step S410 and step S420.
Step S410, under the condition that the on-off state signal represents that the battery units in the on-state exist in the plurality of battery units, acquiring the current value of the battery units in the on-state;
step S420, the battery unit in the on state is controlled to be turned off according to the current value.
In some embodiments, under the condition that the on-off state signals represent that the battery units in the on-state exist in the plurality of battery units, the current value of the battery units in the on-state is obtained, which represents that the current battery units need to be powered off first, the battery management unit obtains the running states of the plurality of batteries under the condition that the starting signals are received, and obtains the voltage difference between the plurality of batteries under the condition that the running states of the plurality of batteries are all in the off-state, or controls the on-state battery to carry out the off-state processing under the condition that the on-state battery in the plurality of batteries exists and the running state is in the on-state, so that the problem that the energy storage battery system cannot be normally powered off due to the fact that the charging states of part of the battery units are not synchronous with the charging state of the energy storage battery system can be avoided, and the reliability and safety of the energy storage battery system are improved.
As shown in fig. 5, fig. 5 is a flowchart of controlling a battery unit corresponding to a second controller according to a power-on/off state signal in the control method of the energy storage battery system according to the embodiment of the present invention, where the control method of the energy storage battery system of the embodiment of the present invention includes, but is not limited to, step S510 and step S520.
Step S510, under the condition that the current value is larger than zero, a second signal is sent to the first controller, so that the first controller controls the output power of the conversion unit to be zero according to the second signal;
in step S520, the battery unit in the on state is controlled to be turned off.
In some embodiments, when the current value is greater than zero, a second signal is sent to the first controller to obtain the current value of the power-on battery, and when the first controller controls the output power of the conversion unit to be zero according to the second signal, the battery unit in the power-on state is controlled to be powered off, wherein the second signal is a communication signal for the first controller to control the output power of the conversion unit to be zero, and the battery management system controls the power-on battery to perform power-off processing when the current value of the battery unit is equal to zero; or under the condition that the current value is larger than zero, sending a communication signal to the converter device so that the converter device controls the power to be zero according to the communication signal; the power-on battery is controlled to carry out shutdown treatment, and the current value of the battery unit is controlled to be zero by controlling the power of the converter device to be zero and the battery unit is shut down, so that the states of the battery units are synchronous, and the safety problem caused by inconsistent electric quantity and running state of the battery units is avoided.
As shown in fig. 6, fig. 6 is a flowchart of controlling a battery unit in a power-on state to be turned off according to a current value in the control method of the energy storage battery system according to the embodiment of the present invention, where the control method of the energy storage battery system of the embodiment of the present invention includes, but is not limited to, step S610 and step S620.
Step S610, under the condition that the on-off state signal represents that the plurality of battery units are in the off state, acquiring a voltage difference value between any two battery units in the plurality of battery units;
step S620, the battery unit is controlled to start according to the voltage difference.
In some embodiments, under the condition that the on-off state signals represent that the plurality of battery units are in the off state, voltage difference values among the plurality of battery units are obtained, which represents that the current battery unit needs to be started up, under the condition that the battery management system receives a starting signal, under the condition that the plurality of voltage differences are smaller than or equal to a voltage difference threshold value, the plurality of batteries are controlled to perform starting up processing, or under the condition that the voltage differences are larger than the voltage difference threshold value, the plurality of batteries are controlled to be in a charging current limiting state and perform starting up processing, and the charging current limiting state is that the current value of the plurality of batteries is smaller than a preset current threshold value, wherein the charging current limiting function is used for controlling the starting up of the battery units, the problem that the impact current in a circuit of the energy storage battery system is overlarge can be avoided, and the reliability and the safety of the energy storage battery system are improved.
In some embodiments, under the condition that voltages of the plurality of battery units are equal, the plurality of batteries are controlled to exit the charging current limiting state, so that the battery units recover to normal current values, the charging speed is improved, and the reliability of the energy storage battery system is improved.
As shown in fig. 7, fig. 7 is a flowchart of controlling the power on of the battery unit according to the voltage difference in the control method of the energy storage battery system according to the embodiment of the invention, wherein the control method of the energy storage battery system of the embodiment of the invention includes, but is not limited to, step S710.
Step S710, determining a voltage difference threshold according to the over-current threshold of the battery cell and the corresponding current loop resistance value, wherein the over-current threshold characterizes the maximum rush current of the battery cell.
In some embodiments, when the voltage difference is greater than the voltage difference threshold, the battery unit is controlled to start up and run at a current value smaller than the preset current threshold, that is, when the voltage difference is greater than the voltage difference threshold, the battery management system starts up the charging current limiting function of the battery, so that the circulation among the battery units is prevented from being greater, and the normal running of the energy storage battery system is prevented from being influenced.
In some embodiments, the method for determining the voltage difference threshold includes obtaining a maximum circulating current value according to the overcurrent protection current values of the plurality of batteries, and determining the voltage difference threshold according to the maximum circulating current value and the resistance value of the current loop corresponding to the maximum circulating current value.
As shown in fig. 8, fig. 8 is an example diagram of a control method of an energy storage battery system in the case where the start switch is a reset switch, where the control method of the energy storage battery system in the embodiment of the invention includes, but is not limited to, step S801 and step S814.
Step S801, control method starts;
step S802, a reset switch is pressed;
step S803, pressing the reset switch for a duration > 3S, and jumping to step S804;
step S804, BMS (Battery management System) reads the state of each other between each battery;
step S805, judging whether all batteries are in a shutdown state, if not, jumping to step S806, and if all batteries are in a shutdown state, jumping to step S809;
step S806, judging whether the current of the battery is 0, if the current of the battery is 0, jumping to step S807, and if the current of the battery is not 0, jumping to step S808;
step S807, the battery is turned off;
step S808, the conversion power of the direct current converter is reduced to 0, the operation is stopped, and the battery is shut down;
step S809, the battery starts self-checking and reads the state of the other side;
step S810, judging whether the pressure difference DeltaU between the batteries is smaller than Uset (voltage difference threshold), if so, jumping to step S811, and if so, jumping to step S812;
Step S811, starting up the battery and starting up the direct current converter;
step S812, starting charging current limiting;
step S813, the battery is started, and the direct current converter is started;
in step S814, control stops.
Fig. 9 is a diagram of an example of a control method of an energy storage battery system in the case where the start switch is a self-locking switch according to an embodiment of the present invention, where the control method of the energy storage battery system of the embodiment of the present invention includes, but is not limited to, step S901 and step S908.
Step S901, the control method starts;
step S902, a switch is closed;
step S903, the battery starts self-checking and reads the state of the other side;
step S904, determining whether the voltage difference Δu between the batteries is smaller than Uset (voltage difference threshold), if the voltage difference Δu between the batteries is smaller than Uset, jumping to step S905, if the voltage difference Δu between the batteries is greater than or equal to Uset, jumping to step S906;
step S905, starting a battery and starting a direct current converter;
step S906, starting charging current limiting;
step S907, starting the battery and starting the DC converter;
in step S908, control stops.
As shown in fig. 10, fig. 10 is a schematic structural diagram of a controller according to an embodiment of the present invention.
Some embodiments of the present invention provide a controller including a memory, a processor, and a computer program stored on the memory and executable on the processor, the processor implementing the control method of the energy storage battery system of any of the above embodiments when executing the computer program, for example, performing the method steps S310 to S320 in fig. 3, the method steps S410 to S420 in fig. 4, the method steps S510 to S520 in fig. 5, the method steps S610 to S620 in fig. 6, the method step S710 in fig. 7, the method steps S801 to S814 in fig. 8, and the method steps S901 to S908 in fig. 9 described above.
The controller 1000 of the embodiment of the present invention includes one or more processors 1001 and a memory 1002, and one processor 1001 and one memory 1002 are exemplified in fig. 10.
The processor 1001 and the memory 1002 may be connected by a bus or otherwise, for example in fig. 10.
Memory 1002 is a non-transitory computer-readable storage medium that may be used to store non-transitory software programs as well as non-transitory computer-executable programs. In addition, the memory 1002 may include high-speed random access memory, and may also include non-transitory memory, such as at least one magnetic disk storage device, flash memory device, or other non-transitory solid state storage device. In some embodiments, the memory 1002 optionally includes memory 1002 remotely located relative to the processor 1001, which may be connected to the controller 1000 through a network, examples of which include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
In some embodiments, the processor executes the computer program to perform the method for controlling the energy storage battery system according to any one of the above embodiments at preset intervals.
Those skilled in the art will appreciate that the device structure shown in fig. 10 is not limiting of the controller 1000 and may include more or fewer components than shown, or may combine certain components, or a different arrangement of components.
In the controller 1000 shown in fig. 10, the processor 1001 may be used to invoke a control program of the energy storage battery system stored in the memory 1002, thereby implementing a control method of the energy storage battery system.
Based on the hardware structure of the controller 1000 described above, various embodiments of the energy storage battery system of the present invention are presented.
The embodiment of the present invention also provides a computer-readable storage medium storing computer-executable instructions for performing the control method of the energy storage battery system described above, for example, the one or more processors may be caused to perform the control method of the energy storage battery system in the method embodiment described above, for example, perform the method steps S310 to S320 in fig. 3, the method steps S410 to S420 in fig. 4, the method steps S510 to S520 in fig. 5, the method steps S610 to S620 in fig. 6, the method step S710 in fig. 7, the method steps S801 to S814 in fig. 8, and the method steps S901 to S908 in fig. 9 described above.
The above described apparatus embodiments are merely illustrative, wherein the units illustrated as separate components may or may not be physically separate, i.e. may be located in one place, or may be distributed over a plurality of network nodes. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
Those of ordinary skill in the art will appreciate that all or some of the steps, systems, and methods disclosed above may be implemented as software, firmware, hardware, and suitable combinations thereof. Some or all of the physical components may be implemented as software executed by a processor, such as a central processing unit, digital signal processor, or microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on computer readable media, which may include computer readable storage media (or non-transitory media) and communication media (or transitory media). The term computer-readable storage medium includes 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, as known to those skilled in the art. Computer-readable storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital Versatile Disks (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. Furthermore, as is well known to those of ordinary skill in the art, communication media typically embodies computer readable instructions, data structures, program modules or other data in a modulated data signal such as a carrier wave or other transport mechanism and includes any information delivery media.
While the preferred embodiments of the present application have been described in detail, the present application is not limited to the above embodiments, and various equivalent modifications and substitutions can be made by those skilled in the art without departing from the spirit of the present application, and these equivalent modifications and substitutions are intended to be included in the scope of the present application as defined in the appended claims.
Claims (14)
1. The energy storage battery system is characterized by comprising a conversion unit and a plurality of battery units, wherein the conversion unit is respectively connected with the battery units in a strong electric mode, a first controller of the conversion unit is respectively connected with a second controller of the battery units in a weak electric mode, and controllers of two adjacent battery units are connected in a weak electric mode;
the second controller is used for acquiring on-off state signals sent by the second controllers of other battery units according to the first signals sent by the first controller, and controlling the battery units corresponding to the second controller according to the on-off state signals.
2. The energy storage battery system of claim 1, wherein, in the case where the on-off state signal indicates that a battery cell in an on-state exists among the plurality of battery cells, the second controller is configured to obtain a current value of the battery cell in the on-state, and control the battery cell in the on-state to be turned off according to the current value.
3. The energy storage battery system according to claim 2, wherein the second controller is configured to send a second signal to the first controller to cause the first controller to control the output power of the conversion unit to be zero according to the second signal, and is further configured to control the battery unit in the on state to be off when the output power of the conversion unit is zero.
4. The energy storage battery system of claim 1, wherein, in a case where the on-off state signal indicates that the plurality of battery cells are in an off state, the second controller is configured to obtain a voltage difference between any two battery cells of the plurality of battery cells, and control the battery cells to be turned on according to the voltage difference.
5. The energy storage battery system of claim 4, wherein the second controller is configured to adjust the current value of the battery cell such that the voltage difference is less than or equal to the voltage difference threshold if the voltage difference is greater than the voltage difference threshold.
6. The energy storage battery system of claim 5, wherein the second controller is configured to determine the voltage difference threshold based on an over-current threshold of the battery cell and a corresponding current loop resistance value, the over-current threshold being indicative of a maximum rush current of the battery cell.
7. The control method of the energy storage battery system is characterized in that the energy storage battery system comprises a conversion unit and a plurality of battery units, the conversion unit is respectively connected with the battery units in a strong electric mode, a first controller of the conversion unit is respectively connected with a second controller of the battery units in a weak electric mode, and controllers of two adjacent battery units are connected in a weak electric mode, and the method comprises the following steps:
acquiring on-off state signals sent by the second controllers of other battery units according to the first signals sent by the first controllers;
and controlling the battery unit corresponding to the second controller according to the on-off state signal.
8. The method for controlling an energy storage battery system according to claim 7, wherein the controlling the battery unit corresponding to the second controller according to the on-off state signal includes:
under the condition that the on-off state signal represents that a plurality of battery units in an on-state exist in the battery units, acquiring a current value of the battery units in the on-state;
and controlling the battery unit in the starting state to be shut down according to the current value.
9. The method of claim 8, wherein controlling the battery cell in the on state to be turned off according to the current value comprises:
transmitting a second signal to the first controller to cause the first controller to control the output power of the conversion unit to zero according to the second signal when the current value is greater than zero;
and controlling the battery unit in the starting-up state to be shut down.
10. The method for controlling an energy storage battery system according to claim 7, wherein the controlling the battery unit corresponding to the second controller according to the on-off state signal includes:
under the condition that the on-off state signal represents that the plurality of battery units are in an off state, acquiring a voltage difference value between any two battery units in the plurality of battery units;
and controlling the battery unit to start according to the voltage difference value.
11. The method of claim 10, wherein controlling the battery unit to be turned on according to the voltage difference comprises:
and when the voltage difference value is larger than a voltage difference threshold value, adjusting the current value of the battery unit so that the voltage difference value is smaller than or equal to the voltage difference threshold value.
12. The energy storage battery system of claim 11, wherein the method of determining the voltage difference threshold comprises:
and determining the voltage difference threshold according to the over-current threshold and the corresponding current loop resistance value of the battery unit, wherein the over-current threshold represents the maximum impact current of the battery unit.
13. A controller comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing a method of controlling an energy storage battery system according to any one of claims 7 to 12 when the computer program is executed by the processor.
14. A computer-readable storage medium storing computer-executable instructions for performing the method of controlling the energy storage battery system according to any one of claims 7 to 12.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211049734.XA CN117674331A (en) | 2022-08-30 | 2022-08-30 | Energy storage battery system, control method thereof, controller and storage medium |
| PCT/CN2022/134385 WO2024045371A1 (en) | 2022-08-30 | 2022-11-25 | Energy-storage battery system and control method therefor, and controller and storage medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202211049734.XA CN117674331A (en) | 2022-08-30 | 2022-08-30 | Energy storage battery system, control method thereof, controller and storage medium |
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| WO (1) | WO2024045371A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10374444B2 (en) * | 2014-08-26 | 2019-08-06 | Elite Power Innovations, Llc. | Method and system for battery management |
| JP6309129B1 (en) * | 2017-03-24 | 2018-04-11 | 本田技研工業株式会社 | Charge control device and control program |
| CN112531828B (en) * | 2020-11-26 | 2023-02-10 | 许继集团有限公司 | Electrochemical energy storage power station BMS cooperative control system and method |
| CN112968502A (en) * | 2021-03-31 | 2021-06-15 | 东莞新能安科技有限公司 | Equalizing module, battery management system and series module energy storage system |
| CN114598008A (en) * | 2022-03-25 | 2022-06-07 | 清华大学 | Energy storage power supply device, energy storage power supply control method and device and single chip microcomputer |
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