WO2024045371A1

WO2024045371A1 - Energy-storage battery system and control method therefor, and controller and storage medium

Info

Publication number: WO2024045371A1
Application number: PCT/CN2022/134385
Authority: WO
Inventors: 朱佰盛; 黄招彬; 江海昊; 闫大富; 翟伟刚
Original assignee: 广东美的制冷设备有限公司
Priority date: 2022-08-30
Filing date: 2022-11-25
Publication date: 2024-03-07
Also published as: CN117674331A

Abstract

Disclosed in the present invention are an energy-storage battery system and a control method therefor, and a controller and a storage medium. The energy-storage battery system comprises a conversion unit (1) and a plurality of battery units (2), wherein the conversion unit (1) is in strong-current connection with the plurality of battery units (2), respectively; a first controller of the conversion unit (1) is in weak-current connection with second controllers of the plurality of battery units (2), respectively; and the controllers of two adjacent battery units (2) are in weak-current connection with each other. The control method comprises: according to a first signal sent by a first controller, acquiring a turn-on/off state signal sent by a second controller of another battery unit (S310); and according to the turn-on/off state signal, controlling the battery unit corresponding to the second controller (S320).

Description

Energy storage battery system and control method, controller and storage medium thereof

Cross-references to related applications

This application claims priority to the Chinese patent application with application number 202211049734. incorporated in this application.

Technical field

This application relates to the field of power electronics, and specifically relates to an energy storage battery system and its control method, controller, and storage medium.

Background technique

In current energy storage battery systems composed of multiple battery units connected in parallel with conversion units, the switches of each battery unit are independent of each other. When the energy storage battery system charges and discharges the battery units, the user needs to press each battery individually. The unit switch controls each battery unit on and off;

During the installation or use of the energy storage battery system, since the switches of each battery unit are independent of each other, when some switches are accidentally touched or the on/off control times are inconsistent, the charged status of some battery units and the energy storage battery system may change. The charged state is not synchronized, causing the energy storage battery system to be unable to switch on and off normally and the inrush current in the energy storage battery system circuit to be too large, affecting the reliability and safety of the energy storage battery system.

Contents of the invention

This application proposes an energy storage battery system and its control method, controller, and storage medium. During the installation or use of the energy storage battery system of this application, multiple battery units of the energy storage battery system can be synchronously controlled. , to avoid excessive impact current in the energy storage battery system circuit, thereby improving the reliability and safety of the energy storage battery system.

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. The conversion unit is strongly electrically connected to a plurality of battery units respectively. The first end of the conversion unit The controller is weakly connected to the second controllers of the plurality of battery units respectively, and the controllers of two adjacent battery units are weakly connected between each other;

The second controller is configured to obtain the power-on status signal sent by the second controller of the other battery unit according to the first signal sent by the first controller, and to control the second power-on status signal according to the power-on status signal. The battery unit corresponding to the controller is controlled.

The energy storage battery system according to the embodiment of the first aspect of the present invention at least has the following beneficial effects: by obtaining the on-off status signal sent by the second controller of other battery units according to the first signal sent by the first controller. , control the battery unit corresponding to the second controller according to the power-off status signal, wherein, since the energy storage battery system includes a conversion unit and a plurality of battery units, the conversion unit is connected to a plurality of the battery units respectively. Strong electric connection, the first controller of the conversion unit is weakly connected to the second controllers of multiple battery units, and the controllers of two adjacent battery units are weakly connected, so that the energy storage battery system It can synchronously control multiple battery units to avoid excessive impact current in the energy storage battery system circuit, thereby improving the reliability and safety of the energy storage battery system.

In some embodiments, when the on/off status signal indicates that there is a battery unit in a powered-on state among the plurality of battery units, the second controller is configured to obtain the current of the battery unit in the powered-on state. value, and controls the battery unit in the powered-on state to shut down according to the current value.

In some embodiments, when the current value is greater than zero, the second controller is configured to send a second signal to the first controller, so that the first controller responds to the second signal The output power of the conversion unit is controlled to be zero, and the second controller is also used to control the battery unit in the powered-on state to shut down when the output power of the conversion unit is zero.

In some embodiments, when the on/off status signal indicates that a plurality of the battery units are all in a shutdown state, the second controller is configured to obtain the difference between any two of the plurality of battery units. voltage difference, and controls the battery unit to be powered on according to the voltage difference.

In some embodiments, when the voltage difference is greater than a voltage difference threshold, the second controller is configured to adjust the current value of the battery unit when the voltage difference is greater than the voltage difference threshold, So that the voltage difference is less than or equal to the voltage difference threshold.

In some embodiments, the second controller is configured to determine the voltage difference threshold based on an overcurrent threshold of the battery unit and a corresponding current loop resistance value, and the overcurrent threshold represents the overcurrent threshold of the battery unit. Maximum inrush current.

An embodiment of the second aspect of the present invention provides a control method for an energy storage battery system. The energy storage battery system includes a conversion unit and a plurality of battery units. The conversion unit is strongly electrically connected to a plurality of the battery units. , the first controller of the conversion unit is weakly connected to the second controllers of a plurality of battery units, and the controllers of two adjacent battery units are weakly connected. The method includes:

Obtain the power-on/off status signals sent by the second controllers of other battery units according to the first signals sent by the first controller;

The battery unit corresponding to the second controller is controlled according to the on/off status signal.

In some embodiments, controlling the battery unit corresponding to the second controller according to the on/off status signal includes:

When the on/off status signal indicates that there is a battery unit in a powered-on state among the plurality of battery units, obtaining the current value of the battery unit in the powered-on state;

Control the battery unit in the powered-on state to shut down according to the current value.

In some embodiments, controlling the shutdown of the battery unit in the powered-on state according to the current value includes:

When the current value is greater than zero, sending a second signal to the first controller so that the first controller controls the output power of the conversion unit to zero according to the second signal;

Control the powered-on battery unit to shut down.

When the on/off status signal indicates that a plurality of the battery units are all in a shutdown state, obtain the voltage difference between any two of the plurality of battery units;

The battery unit is controlled to be powered on according to the voltage difference.

In some embodiments, controlling the power-on of the battery unit according to the voltage difference includes:

When the voltage difference is greater than the voltage difference threshold, the current value of the battery unit is adjusted so that the voltage difference is less than or equal to the voltage difference threshold.

In some embodiments, the method for determining the voltage difference threshold includes:

The voltage difference threshold is determined according to the overcurrent threshold of the battery unit and the corresponding current loop resistance value. The overcurrent threshold represents the maximum inrush current of the battery unit.

A third embodiment 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. When the processor executes the computer program Implement the control method of the energy storage battery system as described in any one of the above second aspects.

An embodiment of the fourth aspect of the present invention provides a computer-readable storage medium that stores computer-executable instructions, and the computer-executable instructions are used to implement the energy storage described in any one of the embodiments of the second aspect. Battery system control methods.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention may be realized and obtained by the structure particularly pointed out in the specification and drawings.

Description of drawings

Figure 1 is a schematic diagram of an energy storage battery system provided by an embodiment of the present invention;

Figure 2 is a schematic diagram of a communication port in the energy storage battery system provided by an embodiment of the present invention;

Figure 3 is a flow chart of a control method for an energy storage battery system provided by an embodiment of the present invention;

Figure 4 is a flow chart of controlling the battery unit corresponding to the second controller according to the on/off status signal in the control method of the energy storage battery system provided by the embodiment of the present invention;

Figure 5 is a flow chart for controlling the shutdown of the battery unit in the powered-on state according to the current value in the control method of the energy storage battery system provided by the embodiment of the present invention;

Figure 6 is a flow chart of controlling the battery unit corresponding to the second controller according to the on/off status signal in the control method of the energy storage battery system provided by the embodiment of the present invention;

Figure 7 is a flow chart for controlling the power-on of the battery unit according to the voltage difference in the control method of the energy storage battery system provided by the embodiment of the present invention;

Figure 8 is an example diagram of a control method for an energy storage battery system when the start switch is a reset switch provided by an embodiment of the present invention;

Figure 9 is an example diagram of the control method of the energy storage battery system when the start switch is a self-locking switch provided by an embodiment of the present invention;

Figure 10 is a schematic structural diagram of a controller provided by an embodiment of the present invention.

Reference signs: 1. Transformation unit; 2. Battery unit; 3. Communication port; 4. Start switch.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention and are not intended to limit the present invention. Additionally, the features, operations, or characteristics described in the specification may be combined in any suitable manner to form various embodiments. At the same time, each step or action in the method description can also be sequentially exchanged or adjusted in a manner that is obvious to those skilled in the art. Therefore, the various sequences in the description and drawings are only for clearly describing a certain embodiment, and do not imply a necessary sequence, unless otherwise stated that a certain sequence must be followed.

In the description of the present invention, several means one or more, plural means two or more, greater than, less than, more than, etc. are understood to exclude the original number, and above, below, within, etc. are understood to include the original number. If there is a description of first and second, it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the order of indicated technical features. relation.

The serial numbers assigned to components in this article, such as "first", "second", etc., are only used to distinguish the described objects and do not have any sequential or technical meaning. The terms "connection" and "connection" mentioned in this application include direct and indirect connections (connections) unless otherwise specified.

In the description of the present invention, unless otherwise explicitly limited, words such as setting, installation, and connection should be understood in a broad sense. Those skilled in the art can reasonably determine the specific meaning of the above words in the present invention in combination with the specific content of the technical solution.

In the related technology, in the solution of multiple batteries connected in parallel and a DC converter-shaped energy storage system, each battery will have its own switch and a set of status displays (such as SOC, alarm). When the system needs to be started, each battery needs to press the switch separately to start up. After the startup is completed, it will be charged with strong power for parallel operation. When the system is shut down, you also need to press the switch of each battery one by one, making the system more complicated. Since each battery has a switch, when multiple batteries are connected in parallel, there is a possibility of accidentally pressing the switch during the installation process, causing some batteries to be installed in a live state, with the risk of large current impact, resulting in sparks, and The battery will have short circuit protection issues. At the same time, during the power on and off process, when the response time of each switch is inconsistent, the current impact between multiple batteries is unpredictable, and logic confusion is prone to occur, affecting the normal use of the energy storage battery system.

Based on the above situation, embodiments of the present invention provide an energy storage battery system and its control method, controller, and storage medium, which can obtain the information sent by the second controller of other battery units according to the first signal sent by the first controller. The on/off status signal controls the battery unit corresponding to the second controller according to the on/off status signal. Since the energy storage battery system includes a conversion unit and multiple battery units, the conversion unit is connected to multiple battery units with strong power, The first controller of the conversion unit is weakly connected to the second controllers of multiple battery units respectively, and the controllers of two adjacent battery units are weakly connected so that the energy storage battery system can synchronously control multiple battery units. This avoids excessive impact current in the energy storage battery system circuit, thereby improving the reliability and safety of the energy storage battery system.

The embodiments of the present invention will be further described below with reference to the accompanying drawings.

As shown in Figure 1, Figure 1 is a schematic diagram of an energy storage battery system provided by 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 and Multiple battery units 2 are connected with strong current, the first controller of the conversion unit 1 is connected with the second controller of multiple battery units 2 with weak current, and the controllers of two adjacent battery units 2 are connected with weak current; the second controller The controller is used to obtain the on/off status signal sent by the second controller of 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 on/off status signal.

In some embodiments, referring to Figure 1, the conversion unit 1 in Figure 1 is a DC converter. The DC converter is a power electronic device that converts DC power into voltage or current controllable DC power required by the load. , can realize the adjustment of the average value of the output voltage, and then filter it through the output filter to obtain DC power with controllable current or voltage on the controlled load to provide current values for multiple battery units 2.

In some embodiments, the positive and negative electrodes of the DC converter are connected to the positive and negative electrodes of multiple batteries, the communication port 3 of the DC converter is connected to the communication ports 3 of multiple batteries, and the communication port 3 of the DC converter is connected to the DC converter. The start switch 4 of the device is connected, each of the multiple batteries is equipped with a battery management system, the communication ports 3 of the multiple batteries are connected to the battery management system, the positive and negative electrodes of the multiple batteries are connected in parallel, and multiple batteries send and receive through the communication port 3 Start the start signal of switch 4. When the battery management system receives the start signal, the battery management system is used to obtain the voltage difference between multiple batteries based on the voltage values of the multiple batteries. When the multiple voltage differences are less than or equal to In the case of voltage difference threshold, the battery management system is used to control multiple batteries for power-on processing. Alternatively, when there is a voltage difference greater than the voltage difference threshold, that is, when the maximum voltage difference among the multiple voltage differences between the batteries is greater than the voltage difference threshold, the battery management system is used to control the multiple batteries to be at the charging limit. flow status and perform startup processing, and control the DC converter to perform startup processing. In the charging current limiting state, the current values of multiple batteries are less than the preset current threshold, which can avoid excessive impact current in the energy storage battery system circuit, thereby improving the reliability and safety of the energy storage battery system.

In some embodiments, the first controller is used to control the DC converter to send control signals to multiple battery units 2 and provide power to the multiple battery units 2 , and the second controller is a battery management system, used to control the corresponding battery. Unit 2 performs power-on/off processing and controls the charging and discharging current of the corresponding battery unit 2, and communicates with the battery management systems of other battery units 2 through weak current connections, thereby obtaining the current value of the battery unit 2 in the powered-on state, and based on the current value Control the battery unit 2 in the powered-on state to shut down to avoid excessive impact current in the energy storage battery system circuit. The current value can be either a charging current value or a discharging current value.

In some embodiments, the communication port 3 of the DC converter is connected to the communication ports 3 of multiple batteries through communication lines, and the communication ports 3 between the communication ports 3 of multiple batteries are connected through communication lines. The communication lines are used for Transmit weak signals such as control signals, that is, the first controller of the DC converter is connected to the second controllers of multiple battery units 2 through weak current communication lines, and the controllers of two adjacent battery units 2 are weakly connected through communication lines. connection, and at the same time, strong electric connections are made between the DC converter and the positive and negative poles of the multi-group battery unit 2 through high-voltage lines. After the DC converter is connected to the high-voltage bus, the DC converter controls the current, voltage and power through the high-voltage lines. Multiple battery units 2 connected in parallel perform power supply or discharge to realize the charging and discharging application of multiple battery units 2 .

In some embodiments, multiple groups of battery units 2 and DC converters are physically connected through communication lines and high-voltage lines, and then connected to the high-voltage bus. In the normal state, the high-voltage bus has high-voltage electricity, which can drive the DC converter auxiliary power supply to work, thereby making the DC converter work. The DC converter then provides output voltage to charge the battery, causing the battery to be activated, or the DC converter charges the battery. Send a power-on command to make the battery start working normally. When an abnormal state occurs: For example, the high-voltage bus has no power and the battery is currently in sleep or shutdown state. Obviously, at this time, the DC converter cannot charge the battery to activate it, nor can it send a communication signal to turn it on, which will cause the system to can not work. In this solution, adding a switch button can activate the battery with hardware. This switch signal can reach all batteries at the same time. After receiving the switch signal, the batteries judge each other's status (SOC, voltage, temperature, etc.). When the battery status When the gap is large, mutual current impact is avoided, so that the power-on operation can be carried out in an orderly manner.

Figure 2 is a schematic diagram of the communication port in the energy storage battery system provided by the embodiment of the present invention, where the communication port is the serial communication port COM, which is used to transmit the activation signal of the activation switch between multiple groups of battery units and the DC converter. Communication signals with the DC converter, and communication signals used to obtain current parameters, voltage parameters, and on/off status between multiple battery units. The communication port includes N pins (PIN1 to PINn), PIN1 to The specific definition of PINn is as shown in the following table (1):

Table 1)

In some examples, refer to Table (1), in the communication port, two pins are connected to the switch signal. These two pins of the DC converter are respectively connected to the control port on the switch and control motherboard. , these two pins on the battery side are connected to the hardware wake-up port on the battery management system. This set of switch pins can also be set independently and does not need to be multiplexed with the communication port. Those skilled in the relevant field can set it according to the actual situation. The communication protocols used by the pins used for data communication in the communication port include but are not limited to CAN, RS485, URAT, or a combination of multiple communication methods, technicians in the relevant field can also set it according to the actual situation.

In some embodiments, when the current value is greater than zero, the second controller is used to send a second signal to the first controller, so that the first controller controls the output power of the conversion unit to zero according to the second signal, The second controller is also used to control the battery unit in the powered-on state to shut down when the output power of the conversion unit is zero.

In some embodiments, when the on/off status signal indicates that there is a battery unit in the powered-on state among the plurality of battery units, the second controller is configured to obtain the current value of the battery unit in the powered-on state, and control the powered-on state according to the current value. status of the battery unit is shut down.

In some embodiments, when the current value is greater than zero, the second controller is used to send a second signal to the first controller, and when the first controller controls the output power of the conversion unit to zero according to the second signal Next, the second controller is used to control the battery unit in the powered-on state to shut down.

In some embodiments, the startup switch includes a reset switch and a self-locking switch. When the startup switch is a reset switch, when the button is pressed for more than 3 seconds, the battery BMS confirms that there is a need to start or shut down, and each battery first communicates with each other. Confirm what state the other party is in. When one battery is in the powered-on state, all batteries perform the shutdown operation; when all batteries are in the powered-off state, the power-on operation is performed; when performing the power-on operation, first read each other's status and compare the corresponding voltages. If the voltage difference between batteries is greater than the voltage difference threshold, first turn on the charging current limiting function for the corresponding battery, and then perform power-on. At the same time, when the voltages are finally equal, the charging current limiting function for the corresponding battery can be turned off to enable energy storage. The battery system can synchronously control multiple battery units and unify the power on and off times of multiple battery units to avoid safety issues caused by the inability to turn on or off due to inconsistent power on and off times of multiple battery units and excessive inrush current. , thereby improving the reliability and safety of the energy storage battery system.

In some embodiments, the second controller is used to obtain the voltage difference between any two battery units among the plurality of battery units, and when the voltage difference is greater than the voltage difference threshold, enable the charging current limiting function according to the voltage difference. , the charging current limiting function means that when the voltage difference between multiple battery units is greater than the voltage difference threshold, the second controller is used to control the battery unit to start running with a current value less than the preset current threshold, and adjust the battery unit current value, so that the voltage difference is less than or equal to the voltage difference threshold, to avoid excessive impact current in the energy storage battery system circuit, to protect the energy storage battery system, and to limit the unlimited flow of current to prevent damage to the energy storage battery system. , thereby improving the reliability and safety of the energy storage battery system.

In some embodiments, the startup switch includes a reset switch and a self-locking switch. When the startup switch is a self-locking switch, when the switch is closed, the battery management system of the battery unit confirms the startup, performs the startup operation, and first reads the status of each other. , compare the corresponding voltages, if there is a voltage difference between batteries greater than the voltage difference threshold, first enable the charging current limiting function for the corresponding battery, and then perform power-on. The charging current limiting function can be turned off when the voltages are finally equal. When the switch is disconnected, the battery management system reads the current status of the battery. If the current is not 0, the battery control unit issues a stop command to the DC converter. When the battery current reaches 0, it performs a shutdown operation, allowing the storage The energy battery system can synchronously control multiple battery units, unify the power on and off times of multiple battery units, and avoid the problem of being unable to power on or off due to inconsistent power on and off times of multiple battery units, thereby improving energy storage batteries. System reliability and security.

In some embodiments, the second controller is used to determine the voltage difference threshold based on the overcurrent threshold of the battery unit and the corresponding current loop resistance value. The overcurrent threshold represents the maximum inrush current that the battery unit can withstand, and the voltage difference Threshold Uset=overcurrent threshold I*current loop resistance Rt, I is the overcurrent threshold that the battery unit can accept (less than the maximum overcurrent protection value of the battery unit), Rt is the current loop corresponding to the battery unit The sum of the internal resistance of the battery and the connecting cable.

In some embodiments, the calculation formula for the voltage difference threshold Uset of each battery when the circulation is turned on is △U=conversion coefficient k*overcurrent threshold I*U, where I is the acceptable overcurrent threshold of the battery, and I is less than the battery The minimum value of the continuous current resistance of the management system, the continuous current of the battery and the sustainable mature current of the corresponding cable, Rt is the total resistance value of the equivalent internal resistance of the battery + the resistance of the battery management system + the cable resistance + the contact resistance, k is the conversion coefficient corresponding to the conversion technology used.

As shown in Figure 3, Figure 3 is a flow chart of the control method of the energy storage battery system provided by this embodiment. The control method of the energy storage battery system of this embodiment of the present invention includes but is not limited to step S310 and step S320.

Step S310: Obtain the on/off status signals sent by the second controller of other battery units according to the first signal sent by the first controller;

Step S320: Control the battery unit corresponding to the second controller according to the on/off status signal.

In some embodiments, the energy storage battery system includes a conversion unit and a plurality of battery units. The conversion unit is respectively connected with a strong current of the plurality of battery units. The first controller of the conversion unit is respectively connected with a weak current of the second controller of the plurality of battery units. Connection, a weak current connection between the controllers of two adjacent battery units. Acquire the on/off status signals sent by the second controller of other battery units according to the first signal sent by the first controller, and control the battery units corresponding to the second controller according to the on/off status signals, which can enable the operation of multiple battery units. Power on and off status synchronization. Therefore, during the installation or use of the energy storage battery system, it is possible to prevent the user experience and safety issues caused by the battery system being unable to switch on and off normally due to the out-of-synchronization of the charged state of some battery units and the charged state of the energy storage battery system. Thereby improving the reliability and security of the system.

In some embodiments, referring to Figure 1, multiple battery units are connected in parallel, so that the second controller can synchronously receive the first signal of the conversion unit through the communication port, where the first signal is after the start switch on the conversion unit is triggered. , the energy storage battery system power-on signal sent by In the case of resetting the switch, it is necessary to obtain the power-on status signal sent by the second controller of other battery units based on the first signal sent by the first controller. In the case where there is a battery unit running in the power-on state in each battery unit, First, shut down the battery units that are running in a powered-on state, synchronize each battery unit, and then start each battery unit, so that the energy storage battery system can operate normally and realize corresponding charging and discharging applications.

In some embodiments, since in the energy storage battery system, the existing battery activation methods are only charging activation and communication activation, when the battery is in a shutdown state and the converter is also in a state of being unable to provide power (the auxiliary battery is also unable to provide power), It is impossible to simply start the battery from the converter. Therefore, the control method of the energy storage battery system of this application obtains the switches sent by the second controller of other battery units based on the first signal sent by the first controller. The battery unit corresponding to the second controller is controlled according to the power on and off status signal, so that the energy storage battery system can synchronously control multiple battery units, unify the power on and off times of multiple battery units, and avoid multiple battery units being switched on and off. Inconsistent power-on and off times of battery units lead to safety problems caused by inability to turn on or off and excessive inrush current, thereby improving the reliability and safety of the energy storage battery system.

In some embodiments, since multiple battery units are synchronously controlled in the energy storage battery system of the present application, that is, multiple groups of batteries use a single common switch, the energy storage battery system is controlled before shipment. Shutdown operation, and the energy storage battery system has been turned on for more than 5 hours with no load and no communication, so that the energy storage battery system of this application will not be damaged due to errors during the installation process. Touching the independent switch on the battery will turn on the battery, which will lead to a live installation, which poses a safety hazard and improves the safety of the energy storage battery system.

In some embodiments, referring to Figure 1, since there is only one start switch in the entire system, multiple sets of batteries are started at the same time, which facilitates the DC converter to calculate the combined parameters, thereby having a unified state, and the power-on action is only performed once. It can effectively avoid missing battery starts, and there are no switches on multiple battery units. The waterproof treatment is simpler and the surface of the battery unit box can be more beautiful. At the same time, there is no switch on the battery, so there is no need for status identification, and the overall cost will be reduced. Reduce, and there will be no problem of light pollution.

As shown in Figure 4, Figure 4 is a flow chart of controlling the battery unit corresponding to the second controller according to the on/off status signal in the control method of the energy storage battery system provided by the embodiment of the present invention. The embodiment of the present invention The control method of the energy storage battery system includes but is not limited to step S410 and step S420.

Step S410, when the on/off status signal indicates that there is a battery unit in the powered-on state among the plurality of battery units, obtain the current value of the battery unit in the powered-on state;

Step S420: Control the battery unit in the powered-on state to shut down according to the current value.

In some embodiments, when the power-on status signal indicates that there is a battery unit in the power-on state among the plurality of battery units, obtaining the current value of the battery unit in the power-on state represents that the current battery unit needs to be powered off first; the battery When the management unit receives the start signal, it obtains the operating status of multiple batteries. When the operating status of multiple batteries is in the shutdown state, it obtains the voltage difference between the multiple batteries, and calculates the voltage difference between the multiple batteries according to the The voltage difference between the two batteries controls the power-on battery to perform power-on processing; or, when there is a power-on battery in the power-on state among multiple batteries, the power-on battery is controlled to perform power-off processing. This can avoid the problem that the charged state of some battery units and the charged state of the energy storage battery system are out of sync, causing the energy storage battery system to be unable to switch on and off normally, and improve the reliability and safety of the energy storage battery system.

As shown in Figure 5, Figure 5 is a flow chart of controlling the battery unit corresponding to the second controller according to the on/off status signal in the control method of the energy storage battery system provided by the embodiment of the present invention. The embodiment of the present invention The control method of the energy storage battery system includes but is not limited to step S510 and step S520.

Step S510, when the current value is greater than zero, send a second signal to the first controller, so that the first controller controls the output power of the conversion unit to zero according to the second signal;

Step S520: Control the battery unit in the powered-on state to shut down.

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 the first controller controls the output power of the conversion unit to zero according to the second signal. In this case, the battery unit in the powered-on state is controlled to be shut down, where the second signal is the communication signal used by the first controller to control the output power of the conversion unit to zero. The battery management system operates when the current value of the battery unit is equal to zero. when the current value is greater than zero, send a communication signal to the converter device so that the converter device controls the power to zero according to the communication signal; control the startup battery to perform shutdown processing, by The power of the converter device is controlled to zero, and the current value of the battery unit is controlled to zero and the battery unit is shut down to synchronize the status of each battery unit to avoid safety hazards caused by inconsistent power and operating status of each battery unit. question.

As shown in Figure 6, Figure 6 is a flow chart for controlling the shutdown of a battery unit in a powered-on state according to the current value in the control method of the energy storage battery system provided by the embodiment of the present invention. The energy storage battery system of the embodiment of the present invention The control method includes but is not limited to step S610 and step S620.

Step S610, when the on/off status signal indicates that multiple battery units are in a shutdown state, obtain the voltage difference between any two battery units among the multiple battery units;

Step S620: Control the battery unit to be powered on based on the voltage difference.

In some embodiments, when the power-on status signal indicates that multiple battery units are in the power-off state, obtaining the voltage difference between the multiple battery units represents determining that the current battery unit needs to perform a power-on operation. In battery management When the system receives the start signal, if multiple voltage differences are less than or equal to the voltage difference threshold, it controls multiple batteries to start the process, or, if the voltage difference is greater than the voltage difference threshold, it controls multiple batteries. It is in the charging current limiting state and starts up, and controls the converter device to start up. The charging current limiting state means that the current values of multiple batteries are less than the preset current threshold. Among them, using the charging current limiting function to control the starting of the battery unit can avoid Solve the problem of excessive impact current in the energy storage battery system circuit and improve the reliability and safety of the energy storage battery system.

In some embodiments, when the voltages of multiple battery cells are equal, multiple batteries are controlled to exit the charging current limiting state, so that the battery cells return to normal current values, increase the charging speed, and improve the reliability of the energy storage battery system.

As shown in Figure 7, Figure 7 is a flow chart for controlling the startup of a battery unit according to a voltage difference in the control method of the energy storage battery system provided by the embodiment of the present invention. The control method of the energy storage battery system of the embodiment of the present invention , including but not limited to step S710.

Step S710: Determine the voltage difference threshold based on the overcurrent threshold of the battery unit and the corresponding current loop resistance value. The overcurrent threshold represents the maximum inrush current of the battery unit.

In some embodiments, when the voltage difference is greater than the voltage difference threshold, the battery unit is controlled to start running with a current value less than the preset current threshold. That is, when the voltage difference is greater than the voltage difference threshold, the battery management system is turned on. The battery's charging current limiting function prevents large circulation currents between battery units from affecting the normal operation of the energy storage battery system.

In some embodiments, the method for determining the voltage difference threshold includes obtaining the maximum circulating current value based on the overcurrent protection current values of multiple batteries, and determining the voltage based on the maximum circulating current value and the resistance value of the current loop corresponding to the maximum circulating current value. difference threshold.

As shown in Figure 8, Figure 8 is an example diagram of the control method of the energy storage battery system when the start switch is a reset switch provided by the embodiment of the present invention. The control method of the energy storage battery system of the embodiment of the present invention , including but not limited to step S801 and step S814.

Step S801, the control method starts;

Step S802, press the reset switch;

Step S803, if the duration of pressing the reset switch is >3S, jump to step S804;

Step S804, the BMS (battery management system) between the batteries reads each other's status;

Step S805, determine whether all batteries are in a shutdown state. If not all batteries are in a shutdown state, jump to step S806. If all batteries are in a shutdown state, jump to step S809;

Step S806, determine whether the battery current is 0. If the battery current is 0, jump to step S807. If the battery current is not 0, jump to step S808;

Step S807, the battery is shut down;

Step S808: The conversion power of the DC converter drops to 0, stops working, and the battery is shut down;

Step S809: The battery starts self-test and reads the status of the other party;

Step S810, determine whether the voltage difference △U between the batteries is less than Uset (voltage difference threshold). If the voltage difference △U between the batteries is less than Uset, jump to step S811. If the voltage difference △U between the batteries is greater than or equal to Uset , then jump to step S812;

Step S811, the battery is turned on and the DC converter is turned on;

Step S812, turn on charging current limiting;

Step S813, the battery is turned on and the DC converter is turned on;

Step S814, the control method stops.

Figure 9 is an example diagram of a control method of an energy storage battery system when the start switch is a self-locking switch provided by an embodiment of the present invention. 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, the switch is closed;

Step S903, the battery starts self-test and reads the status of the other party;

Step S904, determine whether the voltage difference △U between the batteries is less than Uset (voltage difference threshold). If the voltage difference △U between the batteries is less than Uset, jump to step S905. If the voltage difference △U between the batteries is greater than or equal to Uset , then jump to step S906;

Step S905, the battery is turned on and the DC converter is turned on;

Step S906, turn on charging current limiting;

Step S907, the battery is turned on and the DC converter is turned on;

Step S908, the control method stops.

As shown in Figure 10, Figure 10 is a schematic structural diagram of a controller provided by an embodiment of the present invention.

Some embodiments of the present invention provide a controller. The controller includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, any one of the above embodiments is implemented. The control method of the energy storage battery system, for example, performs the above-described method steps S310 to S320 in Figure 3, method steps S410 to S420 in Figure 4, method steps S510 to S520 in Figure 5, and Figure 6. method steps S610 to step S620, method step S710 in Figure 7 , method steps S801 to step S814 in Figure 8 , and method steps S901 to step S908 in Figure 9 .

The controller 1000 in the embodiment of the present invention includes one or more processors 1001 and a memory 1002. In FIG. 10, one processor 1001 and one memory 1002 are taken as an example.

The processor 1001 and the memory 1002 may be connected through a bus or other means. In FIG. 10 , the connection through a bus is taken as an example.

As a non-transitory computer-readable storage medium, the memory 1002 can be used to store non-transitory software programs and non-transitory computer executable programs. In addition, 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 includes a memory 1002 that is remotely located relative to the processor 1001. These remote memories can be connected to the controller 1000 through a network. At the same time, examples of the above-mentioned network include but are not limited to the Internet, an intranet, a local area network, Mobile communication networks and combinations thereof.

In some embodiments, when the processor executes the computer program, the control method of the energy storage battery system of any of the above embodiments is executed according to a preset interval.

Those skilled in the art can understand that the device structure shown in FIG. 10 does not limit the controller 1000, and may include more or fewer components than shown, or combine certain components, or arrange different components.

In the controller 1000 shown in Figure 10, the processor 1001 can be used to call the control program of the energy storage battery system stored in the memory 1002, thereby implementing the 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 proposed.

Embodiments of the present invention also provide a computer-readable storage medium, which stores computer-executable instructions. The computer-executable instructions are used to implement the above control method of the energy storage battery system. For example, the computer-readable storage medium stores computer-executable instructions. The above-mentioned one or more processors execute the control method of the energy storage battery system in the above-mentioned method embodiment, for example, execute the above-described method steps S310 to step S320 in Figure 3, method steps S410 to step S420 in Figure 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, the method steps S901 to S901 in Fig. 9 S908.

The device embodiments described above are only illustrative, and the units described as separate components may or may not be physically separated, that is, they may be located in one place, or they may be distributed to multiple network nodes. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

Those of ordinary skill in the art can understand that all or some steps and systems in the methods disclosed above can be implemented as software, firmware, hardware, and appropriate combinations thereof. Some or all of the physical components may be implemented as software executed by a processor, such as a central processing unit, a digital signal processor, or a 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). As is known to those of ordinary skill in the art, the term computer-readable storage medium includes volatile and non-volatile storage media implemented in any method or technology for storage of information such as computer-readable instructions, data structures, program modules or other data. Volatile, removable and non-removable media. Computer-readable storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, Digital Versatile Disk (DVD) or other optical disk storage, magnetic cassettes, tapes, disk storage or other magnetic storage devices, Or any other medium that can be used to store the desired information and can be accessed by a computer. Additionally, it is known to those of ordinary skill in the art that 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 may include any information delivery media .

The above is a detailed description of the preferred implementation of the present application, but the present application is not limited to the above-mentioned embodiments. Those skilled in the art can also make various equivalent modifications or substitutions without violating the spirit of the present application. Equivalent modifications or substitutions are included within the scope defined by the claims of this application.

Claims

An energy storage battery system including:

multiple battery cells;

A conversion unit is strongly electrically connected to a plurality of battery units respectively;

Second controllers of a plurality of battery units, wherein the second controllers of two adjacent battery units are weakly connected; and

The first controller of the conversion unit is weakly connected to the second controllers of the plurality of battery units respectively;

Wherein, the second controller is configured to obtain the power on and off status signals sent by the second controllers of other battery units according to the first signal sent by the first controller, and adjust the power on and off status signals of the battery units according to the power on and off status signals. The battery unit corresponding to the second controller controls.
The energy storage battery system according to claim 1, wherein when the on/off status signal indicates that there is a battery unit in a powered-on state among the plurality of battery units, the second controller is configured to obtain the The current value of the battery unit in the powered-on state is used to control the shutdown of the battery unit in the powered-on state according to the current value.
The energy storage battery system according to claim 2, wherein when the current value is greater than zero, the second controller is configured to send a second signal to the first controller, so that the first controller The controller controls the output power of the conversion unit to zero according to the second signal. The second controller is also used to control the power-on state when the output power of the conversion unit is zero. The battery unit shuts down.
The energy storage battery system according to claim 1, wherein when the on/off status signal indicates that a plurality of the battery units are in a shutdown state, the second controller is configured to obtain a plurality of the battery units. The voltage difference between any two battery units in the battery is controlled, and the battery unit is controlled to be powered on according to the voltage difference.
The energy storage battery system according to claim 4, wherein the second controller is configured to adjust the current value of the battery unit when the voltage difference is greater than a voltage difference threshold, so that the voltage difference The value is less than or equal to the voltage difference threshold.
The energy storage battery system according to claim 5, wherein the second controller is configured to determine the voltage difference threshold according to an overcurrent current threshold of the battery unit and a corresponding current loop resistance value, and the overcurrent The current threshold represents the maximum inrush current of the battery cell.
A control method for an energy storage battery system, wherein the energy storage battery system includes a conversion unit and a plurality of battery units, the conversion unit is strongly electrically connected to a plurality of the battery units, and the first of the conversion unit The controller is weakly connected to the second controllers of multiple battery units respectively, and the controllers of two adjacent battery units are weakly connected to each other. The method includes:

Acquire the on/off status signals sent by the second controllers of other battery units according to the first signals sent by the first controller;

The battery unit corresponding to the second controller is controlled according to the on/off status signal.
The control method of 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 status signal includes:

When the on/off status signal indicates that there is a battery unit in a powered-on state among the plurality of battery units, obtain the current value of the battery unit in the powered-on state;

Control the battery unit in the powered-on state to shut down according to the current value.
The control method of an energy storage battery system according to claim 8, wherein the controlling the shutdown of the battery unit in the powered-on state according to the current value includes:

When the current value is greater than zero, sending a second signal to the first controller so that the first controller controls the output power of the conversion unit to zero according to the second signal;

Control the powered-on battery unit to shut down.
The control method of 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 status signal includes:

When the on/off status signal indicates that a plurality of the battery units are all in a shutdown state, obtain the voltage difference between any two battery units among the plurality of battery units;

The battery unit is controlled to be powered on according to the voltage difference.
The control method of an energy storage battery system according to claim 10, wherein the controlling the power-on of the battery unit according to the voltage difference includes:

When the voltage difference is greater than the voltage difference threshold, the current value of the battery unit is adjusted so that the voltage difference is less than or equal to the voltage difference threshold.
The control method of an energy storage battery system according to claim 11, wherein the method for determining the voltage difference threshold includes:

The voltage difference threshold is determined according to the overcurrent threshold of the battery unit and the corresponding current loop resistance value. The overcurrent threshold represents the maximum inrush current of the battery unit.
A controller, including a memory, a processor and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, any one of claims 7 to 12 is implemented. The control method of the energy storage battery system described in the item.
A computer-readable storage medium stores computer-executable instructions, and the computer-executable instructions are used to implement the control method of the energy storage battery system according to any one of claims 7 to 12.