Energy storage module control method, apparatus, device, system and energy storage module

Abstract

The present application relates to the technical field of energy storage. Disclosed are an energy storage module control method, an apparatus, a device, a system and an energy storage module. The energy storage module control method comprises: acquiring a bus current of an energy storage module and available currents of a plurality of battery branches connected in parallel in the energy storage module; and, according to the bus current and the available currents of the battery branches, controlling a target number of battery branches, among the plurality of battery branches, to be put into use. In the embodiments of the present application, according to the bus current and the available currents of the battery branches, a target number of battery branches among the plurality of battery branches can be controlled to be put into use, so as to actively distribute the bus current to the target number of battery branches, thus implementing active distribution of the bus current and reducing the current ripple in the battery branches. Moreover, the present application can enable the battery branches that are put into use to operate under conditions close to the available currents, thus improving the utilization rate of the battery branches.

Description

Energy storage module control method, device, equipment, system and energy storage module

[0001] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office on July 28, 2023, with application number 202310948300.1 and invention name “Control method, device, equipment, system and energy storage module for energy storage module”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of energy storage technology, and in particular to a control method, device, equipment, system and energy storage module of an energy storage module. Background Art

[0003] Among various energy storage technologies, high-voltage direct-mount energy storage is gaining increasing attention and development due to its highly modular structure, which meets the requirements of high efficiency, high reliability, economy, and safety. To increase the power and capacity of high-voltage direct-mount energy storage systems, this can be achieved by increasing the number of cascaded energy storage modules. For a single energy storage module, multiple batteries are typically connected in parallel to meet capacity requirements.

[0004] However, the energy storage module provided by the related art has the problem of large battery current pulsation. Technical issues

[0005] In view of the above problems, the present application provides a control method, device, equipment, system and energy storage module for reducing battery current pulsation. Technical Solutions

[0006] To achieve the above objectives, this application adopts the following technical solutions:

[0007] In a first aspect, an embodiment of the present application provides a method for controlling an energy storage module, comprising:

[0008] Obtain the bus current of the energy storage module and the available current of multiple battery branches connected in parallel in the energy storage module; and control the target number of battery branches among the multiple battery branches to be put into use based on the bus current and the available current of each battery branch.

[0009] In the technical solution of the embodiments of the present application, a target number of battery branches among multiple battery branches are controlled to be put into use based on the bus current and the available current of each battery branch. This allows the bus current to be actively distributed to the target number of battery branches, achieving active distribution of the bus current to reduce current pulsation in the battery branches. Furthermore, each battery branch in use can be operated under conditions close to the available current, thereby improving battery branch utilization.

[0010] In some embodiments, controlling a target number of battery branches from a plurality of battery branches to be put into use based on the bus current and the available current of each battery branch includes: determining the total available current of the currently used battery branch based on the available current of each battery branch and the currently used battery branch; and increasing or decreasing the number of battery branches put into use based on the relationship between the bus current and the total available current. The target number is equal to the sum of the number of battery branches currently put into use and the number of battery branches to be added into use, or equal to the difference between the number of battery branches currently put into use and the number of battery branches to be reduced into use.

[0011] In an embodiment of the present application, increasing or decreasing the number of battery branches put into use according to the relationship between the bus current and the total available current can reduce the current pulsation of the battery branches and can also enable each battery branch put into use to operate under conditions close to the available current, thereby improving the utilization rate of the battery branches.

[0012] In some embodiments, controlling a target number of battery branches among a plurality of battery branches to be put into use based on a bus current and an available current of each battery branch includes: determining a target number of battery branches that need to be put into use among a plurality of battery branches based on the bus current and the available current of each battery branch; and controlling the target number of battery branches among the plurality of battery branches to be put into use based on the target number.

[0013] In the embodiment of the present application, a target number of battery branches to be put into use among multiple battery branches is first determined based on the bus current and the available current of each battery branch. Then, based on the target number, the target number of battery branches among the multiple battery branches is controlled to be put into use. The target number of battery branches can be dynamically controlled to be put into use in real time, and the bus current can be actively distributed to each battery branch in use in real time, thus achieving active distribution of the bus current, thereby reducing current pulsation in the battery branches and improving battery branch utilization.

[0014] In some embodiments, controlling a target number of battery branches among the plurality of battery branches to be put into use includes: selecting the target number of battery branches from the plurality of battery branches to be put into use according to a sequence in which the plurality of battery branches are put into use.

[0015] In the embodiment of the present application, the control device selects a target number of battery branches for use according to the order in which the multiple battery branches are put into use, which can meet the requirements of the order in which the battery branches are put into use and achieve corresponding beneficial effects.

[0016] In some embodiments, a method for determining the order in which multiple battery branches are put into use includes: obtaining first battery states of the multiple battery branches, where the first battery states include at least one of a state of charge, a state of health, and a state of remaining energy; and determining the order in which the multiple battery branches are put into use based on a size relationship between the first battery states of the respective battery branches.

[0017] In the embodiment of the present application, the control device determines the order in which multiple battery branches are put into use based on the magnitude relationship between the first battery states of the battery branches. Furthermore, based on the order in which the multiple battery branches are put into use, a target number of battery branches are selected for use, thereby achieving equalization of the first battery states of the battery branches.

[0018] In some embodiments, the first battery state includes at least two of a state of charge, a state of health, and a state of remaining energy. Determining the order in which the multiple battery branches are put into use based on the magnitude relationship between the first battery states of the respective battery branches includes: determining the first battery state of each battery branch based on the at least two states and the weights of the at least two states relative to the first battery state; and determining the order in which the multiple battery branches are put into use based on the magnitude relationship between the first battery states of the respective battery branches.

[0019] In the embodiment of the present application, the control device determines the first battery state of each battery branch based on the at least two states and the weights of the at least two states relative to the first battery state, and uses this to determine the order in which the multiple battery branches are put into use. This arrangement can achieve SOX balancing for each battery branch.

[0020] In some embodiments, a target number of battery branches among a plurality of battery branches is controlled to be put into use based on a bus current and the available current of each battery branch, including: determining an average available current of the plurality of battery branches based on the available current of each battery branch; determining a target number of battery branches that need to be put into use among the plurality of battery branches based on the bus current and the average available current; and controlling the target number of battery branches among the plurality of battery branches to be put into use based on the target number.

[0021] In an embodiment of the present application, the control device reflects the average charging capacity and / or discharging capacity between multiple battery branches through the average available current, and determines the target number of battery branches that need to be put into use among the multiple battery branches based on the bus current and the average available current. The bus current can be distributed to the target number of battery branches as a whole to reduce the current pulsation of the battery branches and improve the utilization rate of the battery branches.

[0022] In some embodiments, determining a target number of battery branches that need to be put into use among a plurality of battery branches based on the bus current and the average available current includes: rounding the quotient of the bus current and the average available current to obtain a first integer; and determining the target number of battery branches that need to be put into use among the plurality of battery branches based on the first integer.

[0023] In this embodiment of the present application, the control device determines the target number of battery branches to be put into use among multiple battery branches by dividing the bus current by the average available current. This arrangement has the advantages of simple implementation and accurate determination of the target number. This arrangement can reduce current pulsation in the battery branches and improve battery branch utilization.

[0024] In some embodiments, the available current of the battery branch is determined by a second battery state of the battery branch, the second battery state comprising at least one of a state of charge, a temperature, and an open circuit voltage.

[0025] In the embodiment of the present application, the control device determines the available current of the battery branch by using at least one of the state of charge, temperature and open circuit voltage, which has the advantage of simple implementation.

[0026] In some embodiments, the battery branch includes batteries and switches connected in series. Controlling a target number of battery branches from the plurality of battery branches to be put into use includes: controlling switches in the target number of battery branches from the plurality of battery branches to turn on, and controlling switches in battery branches other than the target number to turn off.

[0027] In the embodiments of the present application, the control device connects controllable switches in series with the battery branches to achieve controllable individual battery branches, thereby improving the reliability of the energy storage module. For example, if an abnormal fault occurs in any battery branch, it can be disconnected by a switch without affecting the normal operation of other battery branches, without shutting down the entire energy storage module, thereby improving the reliability of the energy storage module.

[0028] In a second aspect, an embodiment of the present application provides an energy storage module, which includes a plurality of battery branches connected in parallel. Each battery branch includes a switch, and the switch is used to control whether the battery branch is put into use.

[0029] In the embodiments of the present application, switches are provided in the battery branches to enable control of each battery branch, thereby improving the reliability of the energy storage module. For example, if an abnormal fault occurs in any battery branch, it can be disconnected by a switch without affecting the normal operation of other battery branches, without shutting down the entire energy storage module, thereby improving the reliability of the energy storage module.

[0030] In some embodiments, the energy storage module is connected to a first measurement module, the battery branch is connected to a second measurement module, and the switch is connected to a controller, which is further connected to the first and second measurement modules. The first measurement module is used to measure the bus current of the energy storage module. The second measurement module is used to measure the available current of multiple battery branches. The controller is used to control the operation of a target number of battery branches among the multiple battery branches by turning the switch on and off based on the bus current and the available current of each battery branch.

[0031] In the embodiments of the present application, the first and second measurement modules and the controller are used to actively distribute the bus current to a target number of battery branches. This active bus current distribution has the advantages of simple implementation and can reduce current pulsation in the battery branches. Furthermore, each battery branch in use can be operated at a condition close to the available current, thereby improving battery branch utilization.

[0032] In some embodiments, the controller includes a calculation module and a drive module, wherein the calculation module is connected to the first measurement module and the second measurement module, and the drive module is connected to the calculation module. The calculation module is configured to determine a target number of battery branches to be put into operation among the multiple battery branches based on the bus current and the available current of each battery branch. The drive module is configured to control the target number of battery branches to be put into operation among the multiple battery branches by controlling the on and off of switches based on the target number.

[0033] In an embodiment of the present application, a target number of battery branches that need to be put into use is first determined by a calculation module, and then the on and off of the switch is controlled by a driving module to control the target number of battery branches in multiple battery branches to be put into use, which has the advantages of simple implementation and high control efficiency.

[0034] In some embodiments, the second measurement module is further configured to determine a sequence of battery branches to be put into use, and the controller is further connected to the second measurement module. The controller is configured to select a target number of battery branches from the plurality of battery branches for use based on the sequence of battery branches to be put into use.

[0035] In the embodiment of the present application, a target number of battery branches are selected for use according to the order in which the multiple battery branches are put into use, which can meet the requirements of the order in which the battery branches are put into use and achieve corresponding beneficial effects.

[0036] In some embodiments, the second measurement module is used to determine the order in which multiple battery branches are put into use based on the size relationship between the first battery states of each battery branch, where the first battery state includes at least one of the state of charge, the state of health, and the state of remaining energy.

[0037] In the embodiment of the present application, the order in which the multiple battery branches are put into use is determined based on the magnitude relationship between the first battery states of the battery branches, and ultimately the first battery states of the battery branches can be balanced.

[0038] In a third aspect, an embodiment of the present application provides a control device for an energy storage module, including: an acquisition module for acquiring the bus current of the energy storage module and the available current of multiple battery branches connected in parallel in the energy storage module; and a control module for controlling a target number of battery branches among the multiple battery branches to be put into use based on the bus current and the available current of each battery branch.

[0039] In a fourth aspect, an embodiment of the present application provides a control device, comprising a memory, a processor, and a program stored in the memory and executable on the processor. When the processor executes the program, the control method provided in the first aspect above is implemented.

[0040] In a fifth aspect, an embodiment of the present application provides an energy storage control system, comprising an energy storage module and the control device provided in the fourth aspect.

[0041] In a sixth aspect, an embodiment of the present application provides a computer-readable storage medium, which stores a program. When the program is executed by a processor, the control method provided in the first aspect is implemented.

[0042] In a seventh aspect, embodiments of the present application provide a chip system, comprising a processor coupled to a memory, the processor executing a computer program stored in the memory to implement the control method described in any one of the first aspects. The chip system can be a single chip or a chip module composed of multiple chips.

[0043] In an eighth aspect, an embodiment of the present application provides a computer program product, which, when executed on a control device, enables the control device to execute the control method described in any one of the first aspects above.

[0044] It can be understood that the beneficial effects of the third to eighth aspects mentioned above can be found in the relevant description of the first aspect mentioned above, and will not be repeated here.

[0045] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present application. The same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0047] FIG1 is a schematic diagram of an application scenario of a control method for an energy storage module provided in some embodiments of the present application;

[0048] FIG2 is a flow chart of a control method for an energy storage module provided in some embodiments of the present application;

[0049] FIG3 is a schematic structural diagram of an energy storage module provided in some embodiments of the present application;

[0050] FIG4 is another schematic flow chart of a method for controlling an energy storage module according to some embodiments of the present application;

[0051] FIG5 is another flow chart of a method for controlling an energy storage module according to some embodiments of the present application;

[0052] FIG6 is another schematic flow chart of a method for controlling an energy storage module according to some embodiments of the present application;

[0053] FIG7 is another schematic flow chart of a method for controlling an energy storage module according to some embodiments of the present application;

[0054] FIG8 is another flow chart of a method for controlling an energy storage module according to some embodiments of the present application;

[0055] FIG9 is another schematic flow chart of a method for controlling an energy storage module according to some embodiments of the present application;

[0056] FIG10 is another schematic flow chart of a method for controlling an energy storage module according to some embodiments of the present application;

[0057] FIG11 is another schematic structural diagram of an energy storage module provided in some embodiments of the present application;

[0058] FIG12 is another flow chart of a method for controlling an energy storage module according to some embodiments of the present application;

[0059] FIG13 is a schematic structural diagram of a control device provided in some embodiments of the present application;

[0060] FIG14 is a schematic diagram of the structure of a control device provided in some embodiments of the present application;

[0061] FIG15 is another schematic diagram of the structure of a control device provided in some embodiments of the present application;

[0062] FIG16 is a schematic structural diagram of an MMC energy storage system provided in some embodiments of the present application;

[0063] FIG17 is a schematic structural diagram of a DC direct-mounted energy storage system provided in some embodiments of the present application;

[0064] FIG18 is a schematic structural diagram of an AC direct-mounted energy storage system provided in some embodiments of the present application;

[0065] FIG19 is a schematic structural diagram of a PSC energy storage system provided in some embodiments of the present application;

[0066] FIG20 is a schematic structural diagram of a full-bridge energy storage module provided in some embodiments of the present application;

[0067] FIG21 is a schematic structural diagram of a half-bridge energy storage module provided in some embodiments of the present application.

[0068] Modes for Carrying Out the Invention

[0069] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0070] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0071] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0072] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0073] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0074] In related technologies, energy storage modules typically include multiple batteries connected in parallel. These batteries can store and / or output electrical energy. This means the module has charging, storing, and / or discharging capabilities.

[0075] However, when the energy storage module is operating, as the bus current of the energy storage module changes, multiple batteries connected in parallel may experience large current pulsation. Current pulsation refers to the situation where the positive and negative polarity of the current remains unchanged, but the current magnitude fluctuates over time. The large current pulsation problem of multiple batteries connected in parallel means that the current magnitude of at least one battery fluctuates by more than a preset value. This large current pulsation problem can disrupt the consistency between batteries and shorten their service life.

[0076] In view of this, an embodiment of the present application provides a control method for an energy storage module, which is used to control the use of a target number of battery branches among multiple battery branches based on the bus current of the energy storage module and the available current of multiple parallel battery branches in the energy storage module. This can actively distribute the bus current to the target number of battery branches, achieving active distribution of the bus current to reduce current pulsation in the battery branches. The control method can also ensure that the target number of battery branches put into use operate under conditions close to the available current, thereby improving the utilization rate of the battery branches.

[0077] The battery in the embodiment of the present application may be a secondary battery. The energy storage module in the embodiment of the present application may be used in various energy storage systems that use energy storage modules for energy storage. The energy storage system may be, but is not limited to, a high-voltage direct-mounted energy storage system, a modular multilevel converter (MMC) energy storage system, or a power control system (PCS) energy storage system. The high-voltage direct-mounted energy storage system may include an AC direct-mounted energy storage system and a DC direct-mounted energy storage system, among others.

[0078] Please refer to Figure 1, which shows a schematic diagram of an application scenario of the control method of the energy storage module provided in this scenario example. The energy storage system 2000 can be a high-voltage direct-mounted energy storage system, an MMC energy storage system, or a PCS energy storage system having an energy storage module 100. The energy storage system 2000 can be used for charging and storing energy through a charging power supply 3000, and can also be used to provide electric energy to an electrical device 4000. The electrical device 4000 can be, but is not limited to, an electric toy, an electric tool, an electric vehicle, an electric car, a ship, a spacecraft, and the like. Electric toys can include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, and the like. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, and the like. The charging power supply 3000 can be a power transmission network of a power grid, or other charging power sources.

[0079] The energy storage module control method provided in the embodiment of the present application can be applied to the control device 1000 in Figure 1. For example, the control device 1000 is connected to the energy storage module 100 in the energy storage system 2000 to control the energy storage module 100 to implement the above control method.

[0080] In this example scenario, the control method for an energy storage module is applied to a control device 1000. Specifically, the control device 1000 obtains the bus current of the energy storage module 100 and the available current of multiple battery branches in the energy storage module 100. Based on the bus current and the available current of each battery branch, the control device 1000 controls a target number of battery branches to be put into use, thereby reducing current pulsation in the battery branches.

[0081] In the above scenario example, the bus current is actively distributed to a target number of battery branches based on the bus current of the energy storage module 100 and the available current of each battery branch. This allows for active bus current distribution, reducing current pulsation in the battery branches. Furthermore, each battery branch in use can operate at a condition close to the available current, thereby improving battery branch utilization.

[0082] In order to illustrate the technical solution described in this application, specific embodiments are provided below.

[0083] The following describes the control method of the energy storage module provided in the embodiment of the present application, taking the execution subject of the embodiment of the present application as the control device 1000 as an example.

[0084] Referring to FIG. 2 , some embodiments of the present application provide a method for controlling an energy storage module. The method may include the following steps:

[0085] S210: The control device obtains the bus current of the energy storage module and the available current of multiple battery branches connected in parallel in the energy storage module.

[0086] As shown in Figure 3, in this embodiment of the present application, the energy storage module includes m battery branches connected in parallel. m is an integer greater than or equal to 2. Each battery branch is equipped with a battery, which stores and / or outputs electrical energy. This means that the energy storage module can operate in both a charging and storage mode and a discharging mode.

[0087] The bus current is the sum of the currents of m parallel-connected battery branches, reflecting the total charging and / or discharging current required by the energy storage module. The available current is the discharge and / or charging current allowed by each battery branch, reflecting the discharge and / or charging capacity of each battery branch.

[0088] As an example, the control device may measure the bus current through a current transformer. As an example, the control device may also calculate or obtain the available current of the battery through a table lookup method based on the state of charge and temperature of the battery.

[0089] It should be noted that the available current of multiple battery branches connected in parallel refers to the available current of n battery branches, where n is an integer greater than 1 and is less than or equal to m.

[0090] It should be understood that since both the battery temperature and state of charge can be measured with the battery open circuit, when n is equal to m, step S210 obtains the available current of the m battery branches in the energy storage module, that is, the available current of all battery branches. At this point, all or some of the m battery branches in the energy storage module may be in use.

[0091] When n is less than m, step S210 obtains the available current of some of the m battery branches in the energy storage module, for example, the n battery branches are put into use, and mn battery branches are not put into use.

[0092] It should be understood that the total charging current and / or total discharging current required by the energy storage module may vary in different application scenarios. For example, if the power consumption of the power consumption device is large, or the charging power output of the charging power supply is large, the total charging current and / or total discharging current required by the energy storage module will be large. If the power consumption of the power consumption device is small, or the charging power output of the charging power supply is small, the total charging current and / or total discharging current required by the energy storage module will be small.

[0093] Similarly, in different application scenarios, the discharge current and / or charging current allowed by each battery branch are different. For example, due to the influence of at least one of the battery's state of charge (SOC), battery temperature, battery heat dissipation capability, battery stability, and battery life, the discharge current and / or charging current allowed by the battery branch are different under different states of charge, temperatures, heat dissipation capabilities, stability, or service life. For example, when the battery's state of charge is high, the discharge current allowed by the battery branch is large, while the charging current allowed is small. That is, when the battery's state of charge is high, the available current for the battery branch during discharge is large, while the available current for charging is small.

[0094] S220: The control device controls a target number of battery branches among the multiple battery branches to be put into use according to the bus current and the available current of each battery branch.

[0095] Based on the above description, the control device controls the commissioning of a target number of battery branches from a plurality of battery branches based on the bus current and the available current of each battery branch, that is, based on the total charging current and / or total discharging current required by the energy storage module, as well as the discharge current and / or charging current allowed by each battery branch. This setting can proactively distribute the bus current to the target number of battery branches, thereby reducing the current ripple of each battery branch in operation below a preset value, thereby reducing the current ripple of the battery branches. In this embodiment of the present application, the target number is less than or equal to m.

[0096] In the aforementioned energy storage module control method, the control device can actively distribute the bus current to each active battery branch, achieving active bus current distribution to reduce current pulsation in the battery branches. This also allows each active battery branch to operate at a current close to the available current, thereby improving battery branch utilization.

[0097] In some embodiments, the control device can monitor the bus current of the energy storage module and the available current of each battery branch in real time to control the use of a target number of battery branches in real time, thereby controlling the current ripple of the used battery branches to be lower than a preset value in real time to reduce the current ripple of the battery branches. In addition, the control device can control each used battery branch in real time to operate at a condition close to the available current to improve the utilization rate of the battery branches.

[0098] Referring to FIG. 4 , in some embodiments of the present application, step S220, i.e., controlling a target number of battery branches among the plurality of battery branches to be put into use based on the bus current and the available current of each battery branch, may include the following steps:

[0099] S410: The control device determines the total available current of the battery branch currently in use according to the available current of each battery branch and the battery branch currently in use.

[0100] Since the available current of each battery branch is known, the total available current of the battery branch currently in use can be determined in combination with the battery branch currently in use, that is, the charging capacity and / or discharging capacity of the battery branch currently in use can be determined.

[0101] For example, the number of battery branches currently in use is n, and their available currents are i1, i2, ..., in. Then the total available current of the battery branches currently in use is equal to i1+i2+...+in.

[0102] S420. The control device increases or decreases the number of battery branches put into use according to the relationship between the bus current and the total available current.

[0103] The target number in step S220 is equal to the sum of the number of battery branches currently in use and the number of battery branches added to use, or equal to the difference between the number of battery branches currently in use and the number of battery branches reduced to use.

[0104] It should be understood that, based on the relationship between the bus current and the total available current, it can be determined whether the bus current is too large, too small, or moderate.

[0105] For example, when the difference between the bus current and the total available current is greater than a first threshold, it indicates that the bus current is too high and the number of battery branches in use needs to be increased. In this case, the target number is equal to the sum of the number of battery branches currently in use and the number of battery branches to be increased.

[0106] For example, when the difference between the total available current and the bus current is greater than a second threshold, it indicates that the bus current is too low and the number of battery branches in use needs to be reduced. In this case, the target number is equal to the difference between the number of battery branches currently in use and the number of battery branches to be reduced.

[0107] For another example, when the absolute value of the difference between the bus current and the total available current is less than a third threshold, it indicates that the bus current is moderate and the number of battery branches in use needs to be maintained unchanged.

[0108] The above-mentioned energy storage module control method increases or decreases the number of battery branches put into use according to the relationship between the bus current and the total available current. This can reduce the current pulsation of the battery branches and enable each battery branch put into use to operate under conditions close to the available current, thereby improving the utilization rate of the battery branches.

[0109] In some embodiments, when the difference between the bus current and the total available current is greater than a first threshold, the control device adds a first preset number of battery branches to use, for example, the first preset number is 1, 2, 3, or other values.

[0110] In some embodiments, when the difference between the total available current and the bus current is greater than a second threshold, the control device reduces the number of battery branches put into use by a second preset number, for example, the second preset number is 1, 2, 3 or other values.

[0111] Referring to FIG. 5 , in some embodiments of the present application, step S220, i.e., controlling a target number of battery branches among the plurality of battery branches to be put into use based on the bus current and the available current of each battery branch, may include the following steps:

[0112] S510: The control device determines a target number of battery branches that need to be put into use among the multiple battery branches based on the bus current and the available current of each battery branch.

[0113] Because the bus current reflects the total charging and / or discharging current required by the energy storage modules, the available current reflects the discharge and / or charging capacity of each battery branch. Therefore, a target number of battery branches to be put into operation can be determined. For example, the target number of battery branches can be determined such that the sum of the available currents of the target number of battery branches is greater than or equal to the bus current.

[0114] For example, the available currents of m battery branches are i1, i2, ..., im. The control device selects a target number of battery branches so that the sum of the available currents of the target number of battery branches is greater than or equal to the bus current. This determines the target number of battery branches to be put into use.

[0115] S520: The control device controls a target number of battery branches among the multiple battery branches to be put into use according to the target number.

[0116] The above-described energy storage module control method first determines a target number of battery branches to be put into operation among multiple battery branches based on the bus current and the available current of each battery branch. Then, based on the target number, the target number of battery branches is controlled to be put into operation. This method can dynamically control the target number of battery branches to be put into operation in real time, proactively distributing the bus current to each battery branch in operation in real time. This proactive distribution of bus current reduces current pulsation in the battery branches and improves battery branch utilization.

[0117] It should be noted that in any of the embodiments shown in FIG. 2 , FIG. 4 , and FIG. 5 , a target number of battery branches can be arbitrarily selected from a plurality of battery branches for use to reduce current ripple in the battery branches and improve battery branch utilization. For example, the sum of the available currents of the arbitrarily selected target number of battery branches is greater than or equal to the bus current.

[0118] Referring to FIG. 6 , in some embodiments of the present application, controlling a target number of battery branches among the plurality of battery branches to be put into use in step S220 may include the following steps:

[0119] S610: The control device selects a target number of battery branches from the multiple battery branches and puts them into use according to the order in which the multiple battery branches are put into use.

[0120] It should be noted that the order in which multiple battery branches are put into use may be manually set or set according to a preset rule. For example, the preset rule may include, but is not limited to, the number of the battery branch, the state of charge, and health status of the batteries in the battery branch.

[0121] In the above-mentioned control method of the energy storage module, the control device selects a target number of battery branches for use according to the order in which the multiple battery branches are put into use, which can meet the requirements of the order in which the battery branches are put into use and achieve corresponding beneficial effects.

[0122] Referring to FIG. 7 , in some embodiments of the present application, a method for determining the order in which multiple battery branches are put into use may include the following steps:

[0123] S710: A control device obtains first battery states of multiple battery branches.

[0124] In the embodiment of the present application, the first battery state of the battery branch can be described by SOX (State of X). The SOX of the battery includes but is not limited to SOC (State of Charge), SOH (State of Health), and SOE (State of Energy).

[0125] In the embodiment of the present application, the first battery state includes at least one of the state of charge, the state of health, and the state of remaining energy. That is, SOX includes at least one of SOC, SOH, and SOE.

[0126] In the embodiment of the present application, the control device may adopt relevant technologies to obtain at least one of SOC, SOH and SOE.

[0127] S720: The control device determines a sequence for putting the multiple battery branches into use according to a magnitude relationship between the first battery states of the respective battery branches.

[0128] In the embodiment of the present application, the control device may determine the order in which the multiple battery branches are put into use according to the first battery state of the battery branch, that is, according to the SOX of the battery branch, thereby achieving SOX balancing of the multiple battery branches.

[0129] For example, when the energy storage module is in a charging state, the control device controls the battery branches with a larger target number of SOX to be put into use to achieve SOX balance of the battery branches.

[0130] As an example, the control device may determine the order in which the multiple battery branches are put into use according to one of the SOC, SOH, and SOE of each battery branch, thereby achieving SOC, SOH, or SOE balancing of the multiple battery branches.

[0131] Taking SOC as an example, when the energy storage module is in a discharging state, the battery branches with larger SOC are put into use first. That is, the control device controls the target number of battery branches with larger SOC to be put into use to achieve SOC balance among the battery branches.

[0132] Taking SOC as an example, when the energy storage module is in the charging state, the battery branches with smaller SOC are put into use first. That is, the control device controls the target number of battery branches with smaller SOC to be put into use to achieve SOC balance among the battery branches.

[0133] In the above energy storage module control method, the control device determines the order in which multiple battery branches are put into operation based on the relationship between the SOX levels of the battery branches. Based on the order in which the multiple battery branches are put into operation, a target number of battery branches are selected for operation, thereby achieving SOX balancing among the battery branches.

[0134] 8 , in some embodiments of the present application, the first battery state includes at least two of the state of charge, the state of health, and the state of remaining energy, that is, SOX includes at least two of the state of charge, the state of health, and the state of remaining energy.

[0135] The above-mentioned step S720, i.e., determining the order of putting the multiple battery branches into use according to the magnitude relationship between the first battery states of the respective battery branches, may include the following steps:

[0136] S810: The control device determines a first battery state of each battery branch according to at least two states and weights of the at least two states respectively accounted for in the first battery state.

[0137] Since the states such as SOC, SOH and SOE can be expressed as percentage values, the control device can determine the first battery state of each battery branch according to the at least two states and the weights of the at least two states in the first battery state.

[0138] For example, SOX includes SOC and SOH. The weight of SOC is a first weight x, the weight of SOH is a second weight y, and the sum of the first weight x and the second weight y is 1. Then SOX=x*SOC+y*SOH.

[0139] S820: The control device determines a sequence for putting the multiple battery branches into use according to a magnitude relationship between the first battery states of the respective battery branches.

[0140] For example, when the energy storage module is in a discharging state, the battery branch with a larger first battery state SOX is put into use earlier.

[0141] For another example, when the energy storage module is in a charging state, the battery branch with a smaller first battery state SOX is put into use earlier.

[0142] In the above-mentioned energy storage module control method, the control device determines the first battery state of each battery branch based on at least two states and the weights of the at least two states relative to the first battery state, and uses this to determine the order in which the multiple battery branches are put into use. This arrangement can achieve SOX balancing for each battery branch.

[0143] Referring to FIG. 9 , in some embodiments of the present application, step S220, i.e., controlling a target number of battery branches among the plurality of battery branches to be put into use based on the bus current and the available current of each battery branch, may include the following steps:

[0144] S910: The control device determines an average available current of the plurality of battery branches according to the available current of each battery branch.

[0145] Since the available current of each battery branch has been obtained, the control device can calculate and determine the average available current of the multiple battery branches. The average available current is used to reflect the average charging capacity and / or discharging capacity among the multiple battery branches.

[0146] In the embodiment of the present application, the average available current may be, but is not limited to, the arithmetic mean, geometric mean, square mean, harmonic mean, or weighted mean of the available currents of multiple battery branches.

[0147] S920: The control device determines a target number of battery branches that need to be put into use among the multiple battery branches based on the bus current and the average available current.

[0148] When the bus current and the average available current are known, the target number of battery branches that need to be put into use can be determined.

[0149] S930: The control device controls a target number of battery branches among the multiple battery branches to be put into use according to the target number.

[0150] In the control method of the above-mentioned energy storage module, the control device reflects the average charging capacity and / or discharging capacity between multiple battery branches through the average available current, and determines the target number of battery branches that need to be put into use among the multiple battery branches based on the bus current and the average available current. The bus current can be distributed to the target number of battery branches as a whole to reduce the current pulsation of the battery branches and improve the utilization rate of the battery branches.

[0151] Referring to FIG. 10 , in some embodiments of the present application, step S920, i.e., determining a target number of battery branches to be put into use among the multiple battery branches based on the bus current and the average available current, may include the following steps:

[0152] S1010: The control device rounds the quotient of the bus current and the average available current to obtain a first integer.

[0153] It should be noted that rounding can be divided into rounding up and rounding down, that is, the first integer can be determined by rounding up or rounding down.

[0154] For example, when the quotient of the bus current and the average available current is exactly an integer, the first integer is equal to the quotient.

[0155] For another example, when the quotient of the bus current and the average available current is not an integer, i.e., includes an integer part and a decimal part, the first integer obtained by rounding down is equal to the integer part of the quotient. The first integer obtained by rounding up is equal to the integer part of the quotient plus 1.

[0156] S1020: The control device determines, based on the first integer, a target number of battery branches that need to be put into use among the multiple battery branches.

[0157] It should be noted that the first integer can be used as the target number of battery branches that need to be put into use. Alternatively, the sum of the first integer and the pre-added value can be used as the target number of battery branches that need to be put into use. For example, the pre-added value can be 1, 2, 3, or other values.

[0158] In the aforementioned energy storage module control method, the control device determines the target number of battery branches to be put into use among multiple battery branches by calculating the quotient of the bus current and the average available current. This method offers the advantages of simple implementation and accurate target number determination. This arrangement can reduce current pulsation in the battery branches and improve battery branch utilization.

[0159] In some embodiments of the present application, the available current of the battery branch is determined by a second battery state of the battery branch, where the second battery state includes at least one of a state of charge, a temperature, and an open circuit voltage.

[0160] It should be noted that, for a battery, the state of charge, temperature, and open circuit voltage of the battery may affect the available current of the battery branch.

[0161] In the above-mentioned control method for the energy storage module, the control device determines the available current of the battery branch by using at least one of the state of charge, temperature and open circuit voltage, which has the advantage of being simple to implement.

[0162] In some embodiments, when the state of charge and temperature of the battery are known, the control device may determine the available current of the battery branch by looking up a table.

[0163] Referring to FIG. 11 , in some embodiments of the present application, a battery branch circuit includes a battery and a switch connected in series. When the switch is on, the battery is in use. When the switch is off, the battery is no longer in use.

[0164] Referring to FIG. 12 , in step S220 , controlling a target number of battery branches among the plurality of battery branches to be put into use may include the following steps:

[0165] S1210 : The control device controls switches in a target number of battery branches from among the multiple battery branches to be turned on, and controls switches in battery branches other than the target number to be turned off.

[0166] In the aforementioned energy storage module control method, the control device connects controllable switches in series with the battery branches to achieve controllable individual battery branches, thereby improving the reliability of the energy storage module. For example, if an abnormal fault occurs in any battery branch, it can be disconnected by a switch without affecting the operation of other normal battery branches, eliminating the need to shut down the entire energy storage module, thereby improving the reliability of the energy storage module.

[0167] In some embodiments, the switch shown in Figure 11 can be one or more of various types of switching devices such as a metal oxide semiconductor field effect transistor (MOSFET), a bipolar junction transistor (BJT), an insulated gate bipolar transistor (IGBT), a gallium nitride field effect transistor (GaN), a silicon carbide (SiC) power tube, etc., which are not listed one by one in the embodiments of the present application.

[0168] In some embodiments of the present application, an energy storage module is also disclosed. The energy storage module includes multiple battery branches connected in parallel, and each battery branch includes a switch. The switch is used to control whether the battery branch is put into use.

[0169] Optionally, the switch is connected to a control device, and the control device is used to control the switch to be turned on or off, so as to put the battery branch where the switch is located into use or cut off the use of the battery branch.

[0170] The energy storage module described above improves reliability by providing switches within the battery branches to enable control of each individual battery branch. For example, if a battery branch experiences an abnormal fault, it can be disconnected using a switch without affecting the operation of other normal battery branches, eliminating the need to shut down the entire energy storage module. This improves the reliability of the energy storage module.

[0171] In some embodiments of the present application, any battery branch further includes a battery. Optionally, the battery and the switch may be connected in parallel, in series, or in a combination of series and parallel.

[0172] As an example, any battery branch includes multiple batteries, and the multiple batteries and switches are connected in series and parallel. For example, the multiple batteries are connected in parallel, and then the switches are connected in series with the batteries. For another example, the multiple batteries are connected in series, and each battery is connected in parallel with a switch.

[0173] 13 , a specific structure of an energy storage module and a control device is disclosed in some embodiments of the present application. The present embodiment is described by taking an example of a battery branch including batteries and switches connected in series.

[0174] As shown in Figure 13, the energy storage module includes a battery module and a power module. The battery module comprises multiple parallel battery branches, each of which includes a battery cell BAT and a switch K connected in series. The power module includes a switch arm and a capacitor C. Both the switch arm and the capacitor are connected in parallel with the battery branch. The switch arm includes switch transistors Q1 and Q2.

[0175] As shown in FIG13 , the control device includes a first measurement module, a second measurement module and a controller.

[0176] The first measurement module is connected to the energy storage module and is used to measure the bus current of the energy storage module. For example, the first measurement module can obtain the bus current of the energy storage module in real time.

[0177] The second measurement module is connected to a battery branch, such as the battery BAT, and is configured to measure the available current of the multiple battery branches. For example, the second measurement module can obtain the open circuit voltage and temperature of the battery BAT in real time and use this information to calculate the state of charge and available current of the battery BAT.

[0178] The controller is used to control the target number of battery branches among the multiple battery branches to be put into use by controlling the on and off of the switch K according to the bus current and the available current of each battery branch.

[0179] As an example, the controller includes a computing module and a driving module.

[0180] The calculation module is connected to the first measurement module and the second measurement module, and is used to determine a target number of battery branches that need to be put into use among the multiple battery branches according to the bus current and the available current of each battery branch.

[0181] The driving module is configured to control the target number of battery branches among the multiple battery branches to be put into use by controlling the on / off switching of the switches K according to the target number. For example, the driving module is connected to each switch K and is configured to output a switching signal to control the on / off switching of each switch K to control the target number of battery branches among the multiple battery branches to be put into use.

[0182] As an example, the second measurement module is further configured to determine an average available current of the plurality of battery branches based on the available current of the battery BAT. Thus, in some examples, the calculation module is configured to determine a target number of battery branches to be put into use based on the quotient of the bus current and the average available current.

[0183] As an example, the second measurement module is further configured to determine the SOX ranking of multiple battery branches based on the state of charge (SOC) of the battery BAT. The driver module is further connected to the second measurement module. Thus, in some examples, the driver module is configured to control, based on the SOX ranking, the switching on of switches K in a target number of battery branches with higher SOX rankings, and to control the switching off of switches K in battery branches other than the target number.

[0184] As an example, the second measurement module is used to determine the order in which the multiple battery branches are put into use based on the magnitude relationship between the first battery states of the battery branches. The first battery state includes at least one of the state of charge, state of health, and remaining energy state.

[0185] Based on the above description, the control method of the energy storage module in the embodiment of the present application includes the following steps:

[0186] S11. The control device obtains the bus current of the energy storage module through the first measurement module.

[0187] S12: The control device obtains the average available current of the multiple battery branches and the SOX ranking through the second measurement module. The order of step S12 and step S11 is not important.

[0188] S13. The control device rounds the quotient of the bus current of the energy storage module and the average available current of the multiple battery branches through the calculation module, and uses this to determine the target number of battery branches that need to be put into use.

[0189] S14 . According to the SOX ranking, the control device controls, through the driving module, the switches K in the target number of battery branches with higher SOX rankings to be turned on, and controls the switches K in the battery branches other than the target number to be turned off.

[0190] In the aforementioned energy storage module control method, the control device can proactively distribute the bus current to a target number of battery branches, achieving proactive bus current distribution and reducing current pulsation in the battery branches. Furthermore, the control device can ensure that each battery branch in use operates at a current close to the available current, thereby improving battery branch utilization.

[0191] It should be understood that the size of the serial numbers of the steps in the above embodiments does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0192] In some embodiments of the present application, a control device for an energy storage module is provided, comprising a module for executing the method steps in any of the above method embodiments.

[0193] The process of each module in the control device of the energy storage module provided in the embodiment of the present application realizing its own function can be specifically referred to the description of the embodiment shown in Figure 2 and other related method embodiments, which will not be repeated here.

[0194] As shown in FIG. 14 , in some embodiments of the present application, the control device includes an acquisition module 141 and a control module 142 .

[0195] The acquisition module 141 is used to obtain the bus current of the energy storage module and the available current of multiple parallel battery branches in the energy storage module. The control module 142 is used to control the use of a target number of battery branches among the multiple battery branches based on the bus current and the available current of each battery branch.

[0196] The control device for the energy storage module described above also has the aforementioned beneficial effects, namely, it can actively distribute the bus current to each active battery branch, achieving active bus current distribution to reduce current pulsation in the battery branches. Furthermore, it can ensure that each active battery branch operates at a current close to the available current, thereby improving battery branch utilization.

[0197] Figure 15 is a schematic diagram of the structure of a control device provided in one embodiment of the present application. As shown in Figure 15 , the control device 1000 of this embodiment includes: at least one processor 150 (only one is shown in Figure 15 ) and a memory 151 , wherein the memory 151 stores a computer program 152 executable on the processor 150 . When the processor 150 executes the computer program 152, it implements the steps of the above-described energy storage module control method embodiment, such as steps S210 to S220 shown in Figure 2 .

[0198] The control device 1000 may be, but is not limited to, a battery management system, a mobile phone, a desktop computer, a notebook computer, a PDA, a cloud server, or other devices. The control device may include, but is not limited to, a processor 150 and a memory 151. Those skilled in the art will appreciate that FIG15 is merely an example of the control device 1000 and does not limit the control device 1000. The control device 1000 may include more or fewer components than shown, or may combine certain components or different components. For example, the control device may also include an input and transmission device, a network access device, a bus, and the like.

[0199] The processor 150 may be a central processing unit (CPU), other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA), other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor.

[0200] In some embodiments, the memory 151 may be an internal storage unit of the control device 1000, such as a hard disk or memory of the control device 1000. The memory 151 may also be an external storage device of the control device 1000, such as a plug-in hard disk, a smart media card (SMC), a secure digital (SD) card, a flash card, etc. equipped on the control device 1000. Furthermore, the memory 151 may also include both an internal storage unit of the control device 1000 and an external storage device. The memory 151 is used to store an operating system, an application program, a boot loader, data, and other programs, such as the program code of the computer program. The memory 151 may also be used to temporarily store data that has been sent or is about to be sent.

[0201] In some embodiments of the present application, an energy storage control system is further provided, including an energy storage module and a control device 1000 as shown in FIG15 .

[0202] In some embodiments, the energy storage control system includes an energy storage system 2000 having an energy storage module 100 and a control device 1000 as shown in FIG. 1 .

[0203] In some embodiments, the energy storage control system includes an MMC energy storage system having an energy storage module as shown in FIG16 .

[0204] Specifically, SM#1, SM#2, ..., SM#n in Figure 16 are all energy storage modules. Optionally, these energy storage modules are full-bridge energy storage modules or half-bridge energy storage modules.

[0205] As an example, the MMC energy storage system shown in Figure 16 has a three-phase AC busbar. Each phase of the AC busbar is connected to an energy storage module and a reactor that are symmetrically arranged in an upper and lower direction.

[0206] In some embodiments, the energy storage control system includes a DC direct-connect energy storage system having an energy storage module as shown in FIG17 .

[0207] Specifically, SM#1, SM#2, ..., SM#n in Figure 17 are all energy storage modules. Optionally, these energy storage modules are full-bridge energy storage modules or half-bridge energy storage modules.

[0208] As an example, the DC direct-mounted energy storage system shown in FIG17 further includes a reactor, a starting resistor, and an isolation switch connected in series with the energy storage module.

[0209] In some embodiments, the energy storage control system includes an AC direct-mounted energy storage system having an energy storage module as shown in FIG18 .

[0210] Specifically, SM#1, SM#2, ..., SM#n in Figure 18 are all energy storage modules. Optionally, these energy storage modules are full-bridge energy storage modules or half-bridge energy storage modules.

[0211] As an example, the AC direct-connected energy storage system shown in Figure 18 has a three-phase AC busbar. Each phase of the AC busbar is connected to an energy storage module and a reactor.

[0212] In some embodiments, the energy storage control system includes a PSC energy storage system having an energy storage module as shown in Figure 19. Optionally, the structure of the energy storage module is shown in Figure 11.

[0213] As an example, the structure of a full-bridge energy storage module is shown in Figure 20. For example, the full-bridge energy storage module includes a power module and a battery module. The battery module includes multiple battery branches connected in parallel. The power module includes two switching bridge arms and a capacitor C. Capacitor C is connected in parallel with the battery branch, and each of the two switching bridge arms is connected in parallel with capacitor C.

[0214] As an example, the structure of a half-bridge energy storage module is shown in Figure 21. For example, the half-bridge energy storage module includes a power module and a battery module. The battery module includes multiple battery branches connected in parallel. The power module includes a switch bridge arm and a capacitor C. Capacitor C is connected in parallel with the battery branch, and the switch bridge arm is connected in parallel with capacitor C.

[0215] In some embodiments of the present application, a computer-readable storage medium is further provided. The computer-readable storage medium stores a computer program. When the computer program is executed by a processor, the steps in the above-mentioned method embodiments can be implemented.

[0216] In some embodiments of the present application, a computer program product is further provided. When the computer program product is run on a control device, the control device can implement the steps of the above-mentioned various method embodiments when the computer program product is executed.

[0217] In some embodiments of the present application, a chip system is further provided, comprising a processor coupled to a memory, the processor executing a computer program stored in the memory to implement the steps of each of the above method embodiments. For example, the chip system may be a single chip or a chip module composed of multiple chips.

[0218] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant description of other embodiments.

[0219] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0220] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0221] The above-described embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present application, and should all be included in the scope of protection of the present application.

Claims

1. An energy storage module, comprising a plurality of battery branches connected in parallel, any of the battery branches comprising a switch, the switch being used to control whether the battery branch is put into use.

2. The energy storage module according to claim 1, wherein: The energy storage module is connected to a first measuring module, the battery branch is connected to a second measuring module, the switch is connected to a controller, and the controller is also connected to the first measuring module and the second measuring module; The first measuring module is used to measure the bus current of the energy storage module, and the second measuring module is used to measure the available current of the plurality of battery branches; The controller is used to control a target number of the battery branches among the plurality of battery branches to be put into use by controlling the on and off of the switches according to the bus current and the available current of each of the battery branches.

3. The energy storage module according to claim 2, wherein: The controller comprises a calculation module and a driving module, the calculation module is connected to the first measuring module and the second measuring module, and the driving module is connected to the calculation module; The calculation module is used to determine the target number of the battery branches that need to be put into use among the multiple battery branches according to the bus current and the available current of each of the battery branches; The driving module is used to control the target number of battery branches among the plurality of battery branches to be put into use by controlling the on and off of the switch according to the target number.

4. The energy storage module according to claim 2 or 3, wherein: The second measurement module is also used to determine the order in which the plurality of battery branches are put into use, and the controller is also connected to the second measurement module; The controller is used for selecting the target number of battery branches to be put into use from the plurality of battery branches according to the order in which the plurality of battery branches are put into use.

5. The energy storage module according to claim 4, wherein: The second measurement module is used to determine the order in which the multiple battery branches are put into use according to the size relationship between the first battery states of each battery branch, and the first battery state includes at least one of the state of charge, the state of health and the state of remaining energy.

6. A control method for an energy storage module, comprising: Obtaining a bus current of the energy storage module and available currents of a plurality of battery branches connected in parallel in the energy storage module; According to the bus current and the available current of each of the battery branches, a target number of the battery branches are controlled. The battery branch is put into use.

7. The control method according to claim 6, wherein: The step of controlling a target number of the battery branches among the plurality of battery branches to be put into use according to the bus current and the available current of each of the battery branches comprises: Determine the total available current of the battery branch currently in use according to the available current of each battery branch and the battery branch currently in use; The number of the battery branches put into use is increased or decreased according to the relationship between the bus current and the total available current, wherein the target number is equal to the sum of the number of the battery branches currently put into use and the number of the battery branches increased in use, or equal to the difference between the number of the battery branches currently put into use and the number of the battery branches decreased in use.

8. The control method according to claim 6 or 7, wherein: The step of controlling a target number of the battery branches among the plurality of battery branches to be put into use according to the bus current and the available current of each of the battery branches comprises: Determining the target number of the battery branches that need to be put into use among the plurality of battery branches according to the bus current and the available current of each of the battery branches; According to the target number, the target number of battery branches among the plurality of battery branches are controlled to be put into use.

9. The control method according to any one of claims 6 to 8, wherein: Controlling the target number of the battery branches among the plurality of the battery branches to be put into use comprises: According to the order in which the plurality of battery branches are put into use, the target number of battery branches are selected from the plurality of battery branches and put into use.

10. The control method according to claim 9, wherein: The method for determining the order in which the plurality of battery branches are put into use comprises: Acquire a first battery state of the plurality of battery branches, wherein the first battery state includes at least one of a state of charge, a state of health, and a state of remaining energy; The order in which the plurality of battery branches are put into use is determined according to the magnitude relationship between the first battery states of the respective battery branches.

11. The control method according to claim 10, wherein: The first battery state includes at least two states of a state of charge, a state of health, and a state of remaining energy; The determining of the battery states of the plurality of battery branches according to the magnitude relationship between the first battery states of the respective battery branches Order of commissioning, including: Determine the first battery state of each of the battery branches according to the at least two states and the weights of the at least two states respectively accounted for in the first battery state; The order in which the plurality of battery branches are put into use is determined according to the magnitude relationship between the first battery states of the respective battery branches.

12. The control method according to any one of claims 6 to 11, wherein: The step of controlling a target number of the battery branches among the plurality of battery branches to be put into use according to the bus current and the available current of each of the battery branches comprises: Determining an average available current of a plurality of the battery branches according to the available current of each of the battery branches; Determining the target number of the battery branches that need to be put into use among the plurality of battery branches according to the bus current and the average available current; According to the target number, the target number of battery branches among the plurality of battery branches are controlled to be put into use.

13. The control method according to claim 12, wherein: The step of determining the target number of the battery branches that need to be put into use among the plurality of battery branches according to the bus current and the average available current includes: rounding the quotient of the bus current and the average available current to obtain a first integer; The target number of the battery branches that need to be put into use among the plurality of battery branches is determined according to the first integer.

14. The control method according to any one of claims 6 to 13, wherein: The available current of the battery branch is determined by a second battery state of the battery branch, the second battery state comprising at least one of a state of charge, a temperature, and an open circuit voltage.

15. The control method according to any one of claims 6 to 14, wherein: The battery branch includes a battery and a switch connected in series; The controlling the target number of the battery branches among the plurality of the battery branches to be put into use comprises: From among the plurality of battery branches, the switches in the target number of battery branches are controlled to be turned on, and the switches in the battery branches other than the target number are controlled to be turned off.

16. A control device for an energy storage module, comprising: An acquisition module, used for acquiring the bus current of the energy storage module and the available current of a plurality of battery branches connected in parallel in the energy storage module; A control module is used to control a target number of the battery branches among the plurality of battery branches to be put into use according to the bus current and the available current of each of the battery branches.

17. A control device, comprising a memory, a processor, and a program stored in the memory and executable on the processor, wherein when the processor executes the program, the control method according to any one of claims 6 to 15 is implemented.

18. An energy storage control system, comprising an energy storage module and the control device according to claim 17.

19. A computer-readable storage medium, wherein: The computer-readable storage medium stores a program, and when the program is executed by a processor, the control method according to any one of claims 6 to 15 is implemented.

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