Control method, device, equipment and system of energy storage module and energy storage module

Abstract

The invention discloses a control method, device, equipment and system of an energy storage module and the energy storage module, and relates to the technical field of energy storage. The control method of the energy storage module comprises the following steps: acquiring bus current of the energy storage module and available current of a plurality of battery branches which are connected in parallel in the energy storage module; and controlling the target number of battery branches in the plurality of battery branches to be put into use according to the bus current and the available current of each battery branch. In the embodiment of the invention, the target number of battery branches in the plurality of battery branches are controlled to be put into use according to the bus current and the available current of each battery branch. In this way, the bus current can be actively distributed to the target number of battery branches, active distribution of the bus current is achieved, and the current pulsation of the battery branches is reduced. Moreover, each battery branch circuit put into use can work under the working condition close to the available current, and the utilization rate of the battery branch circuits can be improved.

Description

Technical Field

[0001] The present application belongs to the field of energy storage technology, and in particular, relates to a control method, device, equipment, system and energy storage module of an energy storage module. Background Art

[0002] Among various energy storage technologies, high-voltage direct-mounted energy storage has attracted more and more attention and development due to its highly modular structure and ability to meet the requirements of high efficiency, high reliability, economy and safety. In order to increase the power and capacity of high-voltage direct-mounted 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 usually required in parallel to meet capacity requirements.

[0003] However, the energy storage module provided by the related art has the problem of large battery current pulsation. Summary of the invention

[0004] In view of the above problems, the present application provides a control method, device, equipment, system and energy storage module of an energy storage module, which are used to reduce the current pulsation of a battery.

[0005] In a first aspect, an embodiment of the present application provides a control method for an energy storage module, comprising:

[0006] 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 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.

[0007] In the technical solution of the embodiment of the present application, a target number of battery branches among multiple battery branches are controlled to be put into use according to the bus current and the available current of each battery branch. In this way, the bus current can be actively distributed to the target number of battery branches, and the active distribution of the bus current can be realized to reduce the current pulsation of the battery branch. In addition, each battery branch put into use can be made to work under the condition close to the available current, which can improve the utilization rate of the battery branch.

[0008] In some embodiments, according to the bus current and the available current of each battery branch, controlling the target number of battery branches in multiple battery branches to be put into use includes: determining 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; increasing or decreasing the number of battery branches put into use according to the magnitude relationship between the bus current and the total available current. Wherein, 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 or increased, or equal to the difference between the number of battery branches currently in use and the number of battery branches to be decreased.

[0009] In the embodiment of the present application, the number of battery branches put into use can be increased or decreased according to the relationship between the bus current and the total available current, so as to 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, so as to improve the utilization rate of the battery branches.

[0010] In some embodiments, a target number of battery branches among multiple battery branches are controlled to be put into use based on a bus current and the available current of each battery branch, including: determining a target number of battery branches that need to be put into use among multiple battery branches based on the bus current and the available current of each battery branch; and controlling a target number of battery branches among multiple battery branches to be put into use based on the target number.

[0011] In the embodiment of the present application, the target number of battery branches that need 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, and then the target number of battery branches among multiple battery branches are controlled to be put into use based on the target number. The target number of battery branches can be controlled to be put into use in real time and dynamically, and the bus current can be actively distributed to each battery branch put into use in real time, so as to realize the active distribution of the bus current, reduce the current pulsation of the battery branch, and improve the utilization rate of the battery branch.

[0012] In some embodiments, controlling a target number of battery branches among a 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.

[0013] In the embodiment of the present application, the control device selects a target number of battery branches to be put into 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 to achieve corresponding beneficial effects.

[0014] In some embodiments, a method for determining the order in which multiple battery branches are put into use includes: obtaining a first battery status of the multiple battery branches, the first battery status including at least one of a charge status, a health status, and a remaining energy status; and determining the order in which the multiple battery branches are put into use based on a size relationship between the first battery statuses of the respective battery branches.

[0015] In the embodiment of the present application, the control device determines the order of putting multiple battery branches into use according to the magnitude relationship between the first battery states of each battery branch, and selects a target number of battery branches for use according to the order of putting multiple battery branches into use, so as to achieve the balance of the first battery state of each battery branch.

[0016] In some embodiments, the first battery state includes at least two states of a state of charge, a state of health, and a state of remaining energy. According to the magnitude relationship between the first battery states of the battery branches, the order in which the multiple battery branches are put into use is determined, including: determining the first battery state of each battery branch according to the at least two states and the weights of the at least two states respectively occupying the first battery state; determining the order in which the multiple battery branches are put into use according to the magnitude relationship between the first battery states of the battery branches.

[0017] In the embodiment of the present application, the control device determines the first battery state of each battery branch according to at least two states and the weights of the at least two states respectively in the first battery state, and thereby determines the order in which the multiple battery branches are put into use. This arrangement can achieve SOX balancing of each battery branch.

[0018] In some embodiments, a target number of battery branches among multiple battery branches are 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 multiple 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 multiple battery branches based on the bus current and the average available current; and controlling a target number of battery branches among multiple battery branches to be put into use based on the target number.

[0019] 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.

[0020] In some embodiments, a target number of battery branches that need to be put into use among multiple battery branches is determined based on the bus current and the average available current, including: 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 multiple battery branches based on the first integer.

[0021] In the embodiment of the present application, the control device determines the target number of battery branches that need to be put into use among multiple battery branches by the quotient of the bus current and the average available current, which has the advantages of simple implementation and accurate determination of the target number. Such a setting can reduce the current pulsation of the battery branch and improve the utilization rate of the battery branch.

[0022] 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.

[0023] In the embodiment of the present application, the control device determines the available current of the battery branch through at least one of the state of charge, temperature and open circuit voltage, which has the advantage of simple implementation.

[0024] 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 be turned on, and controlling switches in battery branches other than the target number to be turned off.

[0025] In the embodiment of the present application, the control device can improve the reliability of the energy storage module by connecting a controllable switch in series in the battery branch to achieve controllability of each battery branch. For example, when an abnormal fault occurs in any battery branch, it can be cut off by the switch without affecting the operation of other normal battery branches, without shutting down the entire energy storage module, thereby improving the reliability of the energy storage module.

[0026] 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, and any battery branch includes a switch, and the switch is used to control whether the battery branch is put into use.

[0027] In the embodiment of the present application, by setting a switch in the battery branch to realize the controllability of each battery branch, the reliability of the energy storage module can be improved. For example, when an abnormal fault occurs in any battery branch, it can be cut off by the switch without affecting the normal operation of other battery branches, and there is no need to shut down the entire energy storage module, thereby improving the reliability of the energy storage module.

[0028] In some embodiments, the energy storage module is connected to a first measurement module, the battery branch is connected to a second measurement module, the switch is connected to a controller, and the controller is further connected to the first measurement module and the second measurement module. 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 target number of battery branches in the multiple battery branches to be put into use by controlling the on and off of the switch according to the bus current and the available current of each battery branch.

[0029] In the embodiment of the present application, the bus current is actively distributed to the target number of battery branches through the first measurement module, the second measurement module and the controller, and the active distribution of the bus current is realized, which has the advantages of simple implementation and can reduce the current pulsation of the battery branch. In addition, each battery branch put into use can work under the condition close to the available current, which can improve the utilization rate of the battery branch.

[0030] In some embodiments, the controller includes a calculation module and a driving module, the calculation module is connected to the first measurement module and the second measurement module, and the driving module is connected to the calculation module. The calculation module is used to determine the 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. The driving module 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 according to the target number.

[0031] In the embodiment of the present application, the target number of battery branches that need to be put into use is first determined by the calculation module, and then the on and off of the switch is controlled by the 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.

[0032] In some embodiments, the second measurement module is further used to determine the order in which the multiple battery branches are put into use, and the controller is further connected to the second measurement module. The controller is used to select a target number of battery branches from the multiple battery branches for use according to the order in which the multiple battery branches are put into use.

[0033] In the embodiment of the present application, according to the order in which multiple battery branches are put into use, a target number of battery branches are selected to be put into use, which can meet the requirements of the order in which they are put into use to achieve corresponding beneficial effects.

[0034] 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, and the first battery state includes at least one of the state of charge, the state of health, and the remaining energy state.

[0035] In the embodiment of the present application, the order of putting multiple battery branches into use is determined according to 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.

[0036] 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 a bus current of the energy storage module and an 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 multiple battery branches to be put into use based on the bus current and the available current of each battery branch.

[0037] In a fourth aspect, an embodiment of the present application provides a control device, including 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 is implemented.

[0038] In a fifth aspect, an embodiment of the present application provides an energy storage control system, including an energy storage module and the control device provided in the fourth aspect.

[0039] In a sixth aspect, an embodiment of the present application provides a computer-readable storage medium, which stores a program, and when the program is executed by a processor, the control method provided in the first aspect is implemented.

[0040] In a seventh aspect, an embodiment of the present application provides a chip system, the chip system includes a processor, the processor is coupled to a memory, and the processor executes a computer program stored in the memory to implement the control method as described in any one of the first aspects above. The chip system can be a single chip, or a chip module composed of multiple chips.

[0041] In an eighth aspect, an embodiment of the present application provides a computer program product. When the computer program product runs on a control device, the control device executes the control method described in any one of the first aspects above.

[0042] 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.

[0043] 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

[0044] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only used for the purpose of illustrating the preferred embodiments and are not to be considered as limitations of the present application. In addition, the same reference numerals are used throughout the drawings to represent the same components.

[0045] Figure 1 A schematic diagram of an application scenario of a control method for an energy storage module provided in some embodiments of the present application;

[0046] Figure 2 A schematic flow chart of a control method for an energy storage module provided in some embodiments of the present application;

[0047] Figure 3 A schematic diagram of the structure of an energy storage module provided in some embodiments of the present application;

[0048] Figure 4 Another schematic flow chart of a control method for an energy storage module provided in some embodiments of the present application;

[0049] Figure 5 Another schematic flow chart of a control method for an energy storage module provided in some embodiments of the present application;

[0050] Figure 6 Another schematic flow chart of a control method for an energy storage module provided in some embodiments of the present application;

[0051] Figure 7 Another schematic flow chart of a control method for an energy storage module provided in some embodiments of the present application;

[0052] Figure 8 Another schematic flow chart of a control method for an energy storage module provided in some embodiments of the present application;

[0053] Fig. 9 Another schematic flow chart of a control method for an energy storage module provided in some embodiments of the present application;

[0054] Fig.10 Another schematic flow chart of a control method for an energy storage module provided in some embodiments of the present application;

[0055] Fig.11 Another structural schematic diagram of an energy storage module provided in some embodiments of the present application;

[0056] Fig.12 Another schematic flow chart of a control method for an energy storage module provided in some embodiments of the present application;

[0057] Fig.13 A schematic diagram of a structure of a control device provided in some embodiments of the present application;

[0058] Fig.14 A schematic diagram of the structure of a control device provided in some embodiments of the present application;

[0059] Fig.15 Another structural schematic diagram of a control device provided in some embodiments of the present application;

[0060] Fig.16 A schematic diagram of the structure of an MMC energy storage system provided in some embodiments of the present application;

[0061] Fig.17 A schematic diagram of the structure of a DC direct-mounted energy storage system provided in some embodiments of the present application;

[0062] Fig.18 A schematic diagram of the structure of an AC direct-mounted energy storage system provided in some embodiments of the present application;

[0063] Fig.19 A schematic diagram of the structure of a PSC energy storage system provided in some embodiments of the present application;

[0064] Fig. 20 A schematic diagram of the structure of a full-bridge energy storage module provided in some embodiments of the present application;

[0065] Fig.21 A schematic diagram of the structure of a half-bridge energy storage module provided in some embodiments of the present application. DETAILED DESCRIPTION

[0066] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0067] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field 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" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0068] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0069] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0070] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0071] In the related art, the energy storage module usually includes a plurality of batteries connected in parallel. The batteries can realize the function of storing electric energy and / or outputting electric energy. That is, the energy storage module has the function of charging, storing energy and / or discharging energy.

[0072] However, when the energy storage module is working, as the bus current of the energy storage module changes, multiple batteries connected in parallel have a problem of large current pulsation. Among them, current pulsation means that the positive and negative polarities of the current remain unchanged, but the magnitude of the current fluctuates over time. The problem of large current pulsation in multiple batteries connected in parallel means that the current magnitude fluctuation of at least one battery is greater than the preset value. This problem of large current pulsation can destroy the consistency between batteries and shorten the service life of the batteries.

[0073] In view of this, an embodiment of the present application provides a control method for an energy storage module, which is used to control a target number of battery branches in multiple battery branches to be put into use according to the bus current of the energy storage module and the available current of multiple battery branches connected in parallel in the energy storage module. In this way, the bus current can be actively distributed to the target number of battery branches, and the active distribution of the bus current can be achieved to reduce the current pulsation of the battery branches. The control method can also make the target number of battery branches put into use work under conditions close to the available current, so as to improve the utilization rate of the battery branches.

[0074] 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, and a power control system (PCS) energy storage system. Among them, 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, and the like.

[0075] See also Figure 1 , Figure 1 A schematic diagram of an application scenario of the control method of the energy storage module provided in this scenario example is shown. The energy storage system 2000 may 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 may be used for charging and energy storage through a charging power supply 3000, and may also be used to provide electrical energy to an electrical device 4000. The electrical device 4000 may be, but is not limited to, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, and the like. Electric toys may include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, and the like. Spacecraft may include airplanes, rockets, space shuttles, and spacecraft, and the like. The charging power supply 3000 may be a power transmission network of a power grid, or other charging power sources.

[0076] The control method of the energy storage module provided in the embodiment of the present application can be applied to Figure 1In the control device 1000 in the energy storage system 2000. For example, the control device 1000 is connected to the energy storage module 100 in the energy storage system 2000, and is used to control the energy storage module 100 to implement the above control method.

[0077] In this scenario example, the control method of the energy storage module is applied to the control device 1000 as an example for explanation. 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. The control device 1000 controls the target number of battery branches in the multiple battery branches to be put into use according to the bus current and the available current of each battery branch, so as to reduce the current pulsation of the battery branch.

[0078] In the above scenario example, based on the bus current of the energy storage module 100 and the available current of each battery branch, the bus current is actively distributed to the target number of battery branches, which can realize the active distribution of the bus current to reduce the current pulsation of the battery branch. In addition, each battery branch put into use can work under the condition close to the available current, which can improve the utilization rate of the battery branch.

[0079] In order to illustrate the technical solution described in this application, a specific embodiment is provided below for illustration.

[0080] The following describes the control method of the energy storage module provided in the embodiment of the present application by taking the execution subject of the embodiment of the present application as the control device 1000 as an example.

[0081] See also Figure 2 Some embodiments of the present application provide a control method for an energy storage module, and the control method may include the following steps:

[0082] 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.

[0083] like Figure 3 As shown, in the 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 provided with a battery, and the battery is used to store and / or output electrical energy. That is, the energy storage module can work in both a charging energy storage mode and a discharging mode.

[0084] The bus current refers to the sum of the currents of m battery branches connected in parallel, which is used to reflect the total charging current and / or total discharging current required by the energy storage module. The available current refers to the discharge current and / or charging current allowed by each battery branch, which is used to reflect the discharge capacity and / or charging capacity of each battery branch.

[0085] 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.

[0086] 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 n is less than or equal to m.

[0087] It should be understood that since the temperature and state of charge of the battery can be measured when the battery is 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 time, all or part of the m battery branches in the energy storage module can be put into use.

[0088] When n is less than m, step S210 acquires the available current of some battery branches among 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.

[0089] It should be understood that in different application scenarios, the total charging current and / or total discharging current required by the energy storage module are different. For example, when the power consumption of the electrical device is large, or the charging power output by the charging power supply is large, the total charging current and / or total discharging current required by the energy storage module will be large. When the power consumption of the electrical device is small, or the charging power output by the charging power supply is small, the total charging current and / or total discharging current required by the energy storage module will be small.

[0090] Similarly, in different application scenarios, the discharge current and / or charging current allowed by each battery branch is different. For example, limited by 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 is different under different states of charge, temperatures, heat dissipation capabilities, stability, or service life. For example, when the battery's state of charge is large, 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 large, the available current for the battery branch during discharge is large, while the available current for charging is small.

[0091] 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.

[0092] Based on the above description, the control device controls the target number of battery branches in multiple battery branches to be put into use according to the bus current and the available current of each battery branch, that is, according to the total charging current and / or total discharging current required by the energy storage module, and the discharge current and / or charging current allowed by each battery branch. This setting can actively distribute the bus current to the target number of battery branches, so that the current pulsation of each battery branch put into use is lower than the preset value, that is, the current pulsation of the battery branch is reduced. In the embodiment of the present application, the target number is less than or equal to m.

[0093] In the control method of the energy storage module, the control device can actively distribute the bus current to each battery branch in use, realize active distribution of the bus current, and reduce the current pulsation of the battery branch. It can also make each battery branch in use work under conditions close to the available current, which can improve the utilization rate of the battery branch.

[0094] 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 target number of battery branches to be put into use in real time, thereby controlling the current pulsation of the battery branches put into use to be lower than a preset value in real time to reduce the current pulsation of the battery branches. And the control device can control each battery branch put into use to work under a condition close to the available current in real time to improve the utilization rate of the battery branch.

[0095] See also Figure 4 In some embodiments of the present application, the above step S220, i.e., controlling a target number of battery branches among multiple battery branches to be put into use according to the bus current and the available current of each battery branch, may include the following steps:

[0096] 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.

[0097] 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.

[0098] For example, the number of battery branches currently in use is n, and their available currents are respectively i1, i2, ..., in. Then the total available current of the battery branches currently in use is equal to i1+i2+...+in.

[0099] 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.

[0100] 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 to be added, or equal to the difference between the number of battery branches currently in use and the number of battery branches to be reduced.

[0101] 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.

[0102] For example, when the difference between the bus current and the total available current is greater than the first threshold, it indicates that the bus current is too large and the number of battery branches put into use needs to be increased. At this time, the target number is equal to the sum of the number of battery branches currently put into use and the number of battery branches added to be put into use.

[0103] For example, when the difference between the total available current and the bus current is greater than the second threshold, it means that the bus current is too small and the number of battery branches in use needs to be reduced. At this time, 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.

[0104] For another example, when the absolute value of the difference between the bus current and the total available current is less than the third threshold, it indicates that the bus current is moderate and the number of battery branches in use needs to be maintained unchanged.

[0105] The control method of the energy storage module described above can reduce the current pulsation of the battery branches by increasing or decreasing the number of battery branches put into use according to the relationship between the bus current and the total available current, and can also make each battery branch put into use operate under conditions close to the available current to improve the utilization rate of the battery branches.

[0106] 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 be used. For example, the first preset number is 1, 2, 3 or other values.

[0107] 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 second preset number of battery branches to be used. For example, the second preset number is 1, 2, 3 or other values.

[0108] See also Figure 5 In some embodiments of the present application, the above step S220, i.e., controlling a target number of battery branches among multiple battery branches to be put into use according to the bus current and the available current of each battery branch, may include the following steps:

[0109] S510: The control device determines 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.

[0110] Since the bus current reflects the total charging current and / or total discharging current required by the energy storage module, the available current reflects the discharge capacity and / or charging capacity of each battery branch. Therefore, the target number of battery branches that need to be put into use can be determined. For example, the target number of battery branches can be determined so that the sum of the available currents of the target number of battery branches is greater than or equal to the bus current.

[0111] For example, the available currents of m battery branches are i1, i2, ..., im respectively. The control device selects a target number of battery branches from them so that the sum of the available currents of the target number of battery branches is greater than or equal to the bus current. In this way, the target number of battery branches that need to be put into use is determined.

[0112] 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.

[0113] The control method of the energy storage module first determines the target number of battery branches that need to be put into use among multiple battery branches according to the bus current and the available current of each battery branch, and then controls the target number of battery branches among multiple battery branches to be put into use according to the target number. The target number of battery branches can be put into use in real time and dynamically, and the bus current can be actively distributed to each battery branch put into use in real time, so as to realize the active distribution of the bus current, reduce the current pulsation of the battery branch, and improve the utilization rate of the battery branch.

[0114] It should be noted that Figure 2 , Figure 4 and Figure 5 In any of the illustrated embodiments, a target number of battery branches may be arbitrarily selected from a plurality of battery branches to be put into use, so as to reduce the current pulsation of the battery branches and improve the utilization of the battery branches. 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.

[0115] See also Figure 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:

[0116] S610: The control device selects a target number of battery branches from a plurality of battery branches and puts them into use according to the order in which the plurality of battery branches are put into use.

[0117] It should be noted that the order in which the multiple battery branches are put into use may be manually set or set in sequence according to a preset rule. For example, the preset rule is but not limited to the number of the battery branch, the state of charge and health status of the batteries in the battery branch, etc.

[0118] In the 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 to achieve corresponding beneficial effects.

[0119] See also Figure 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:

[0120] S710: A control device obtains a first battery status of multiple battery branches.

[0121] 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 (Stete of Energy).

[0122] 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.

[0123] In the embodiment of the present application, the control device may adopt relevant technologies to obtain at least one of SOC, SOH and SOE.

[0124] S720: The control device determines a sequence of putting the multiple battery branches into use according to a magnitude relationship between the first battery states of the respective battery branches.

[0125] 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, so as to achieve SOX balancing of the multiple battery branches.

[0126] 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.

[0127] 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 balance of the multiple battery branches.

[0128] 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 in the first order. That is, the control device controls the target number of battery branches with larger SOC to be put into use to achieve SOC balance of the battery branches.

[0129] Taking SOC as an example, when the energy storage module is in a charging state, the battery branches with smaller SOC are put into use in the first order. That is, the control device controls the target number of battery branches with smaller SOC to be put into use to achieve SOC balance of the battery branches.

[0130] In the control method of the energy storage module, the control device determines the order of putting multiple battery branches into use according to the size relationship between the SOX of each battery branch, and selects a target number of battery branches for use according to the order of putting multiple battery branches into use, so as to achieve SOX balance of each battery branch.

[0131] See also Figure 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 SOC, SOH, and SOE.

[0132] The above 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:

[0133] 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 accounting for the first battery state.

[0134] Since the states such as SOC, SOH and SOE can be expressed by 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 respectively in the first battery state.

[0135] 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.

[0136] S820: The control device determines a sequence of putting the multiple battery branches into use according to a magnitude relationship between the first battery states of the respective battery branches.

[0137] 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.

[0138] 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.

[0139] In the control method of the energy storage module, the control device determines the first battery state of each battery branch according to at least two states and the weights of the at least two states respectively occupying the first battery state, and thereby determines the order in which the multiple battery branches are put into use. Such a setting can achieve SOX balance of each battery branch.

[0140] See also Fig. 9 In some embodiments of the present application, the above step S220, i.e., controlling a target number of battery branches among multiple battery branches to be put into use according to the bus current and the available current of each battery branch, may include the following steps:

[0141] S910: The control device determines an average available current of multiple battery branches according to the available current of each battery branch.

[0142] 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.

[0143] 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.

[0144] 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.

[0145] 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.

[0146] 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.

[0147] In the control method of the above 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.

[0148] See also Fig.10In some embodiments of the present application, the above step S920, i.e., determining the target number of battery branches that need to be put into use among the multiple battery branches according to the bus current and the average available current, may include the following steps:

[0149] S1010. The control device rounds the quotient of the bus current and the average available current to obtain a first integer.

[0150] 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.

[0151] 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.

[0152] For another example, when the quotient of the bus current and the average available current is not an integer, that is, it includes an integer part and a decimal part. Then 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.

[0153] S1020: The control device determines, according to the first integer, a target number of battery branches that need to be put into use among the multiple battery branches.

[0154] 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. The sum of the first integer and the pre-added value can also be used as the target number of battery branches that need to be put into use. For example, the pre-added value is 1, 2, 3 or other values.

[0155] The control method of the energy storage module described above, in which the control device determines the target number of battery branches that need to be put into use among multiple battery branches by the quotient of the bus current and the average available current, has the advantages of simple implementation and accurate determination of the target number. Such a setting can reduce the current pulsation of the battery branch and improve the utilization rate of the battery branch.

[0156] 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, and the second battery state includes at least one of a state of charge, a temperature, and an open circuit voltage.

[0157] 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.

[0158] In the above-mentioned control method of the energy storage module, the control device determines the available current of the battery branch through at least one of the state of charge, temperature and open circuit voltage, which has the advantage of simple implementation.

[0159] 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 using a table lookup method.

[0160] See also Fig.11 In some embodiments of the present application, the battery branch includes a battery and a switch connected in series. When the switch is turned on, it indicates that the battery is put into use. When the switch is turned off, it indicates that the battery is no longer put into use.

[0161] See also Fig.12 In the above 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:

[0162] S1210: The control device controls switches in a target number of battery branches from among a plurality of battery branches to be turned on, and controls switches in battery branches other than the target number to be turned off.

[0163] In the control method of the energy storage module, the control device connects a controllable switch in series in the battery branch to achieve controllability of each battery branch, which can improve the reliability of the energy storage module. For example, when an abnormal fault occurs in any battery branch, it can be cut off by the switch without affecting the operation of other normal battery branches, without shutting down the entire energy storage module, thereby improving the reliability of the energy storage module.

[0164] In some embodiments, Fig.11 The switch shown 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.

[0165] In some embodiments of the present application, an energy storage module is also disclosed. The energy storage module includes a plurality of battery branches connected in parallel, and any battery branch includes a switch. The switch is used to control whether the battery branch is put into use.

[0166] Optionally, the switch is used to be 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.

[0167] The energy storage module can improve the reliability of the energy storage module by setting switches in the battery branches to achieve controllable control of each battery branch. For example, when an abnormal fault occurs in any battery branch, it can be cut off by the 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.

[0168] 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.

[0169] As an example, any battery branch includes multiple batteries, and multiple batteries and switches are connected in series and parallel. For example, multiple batteries are connected in parallel, and then the switch is connected in series with the battery. For another example, multiple batteries are connected in series, and each battery is connected in parallel with a switch.

[0170] See also Fig.13 In some embodiments of the present application, a specific structure of an energy storage module and a control device is disclosed. The present application embodiment is described by taking a battery branch including batteries and switches connected in series as an example.

[0171] like Fig.13 As shown, the energy storage module includes a battery module and a power module. The battery module includes a plurality of battery branches connected in parallel, and each battery branch includes a battery BAT and a switch K connected in series. The power module includes a switch bridge arm and a capacitor C. The switch bridge arm and the capacitor are both connected in parallel with the battery branch. The switch bridge arm includes a switch tube Q1 and a switch tube Q2.

[0172] like Fig.13 As shown, the control device includes a first measurement module, a second measurement module and a controller.

[0173] 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.

[0174] The second measurement module is connected to the battery branch, such as the battery BAT, and is used to measure the available current of 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 to calculate the charge state and available current of the battery BAT.

[0175] 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.

[0176] As an example, the controller includes a computing module and a driving module.

[0177] The calculation module is connected to the first measurement module and the second measurement module, and is used to determine the 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.

[0178] The driving module is used to control the target number of battery branches in the multiple battery branches to be put into use by controlling the on and off of the switch K according to the target number. For example, the driving module is connected to each switch K and is used to output a switch signal to control the on and off of each switch K to control the target number of battery branches in the multiple battery branches to be put into use.

[0179] As an example, the second measurement module is further used to determine the average available current of multiple battery branches according to the available current of the battery BAT. Thus, in some examples, the calculation module is used to determine the target number of battery branches that need to be put into use according to the quotient of the bus current and the average available current.

[0180] As an example, the second measurement module is also used to determine the SOX ranking of multiple battery branches according to the state of charge of the battery BAT. The driving module is also connected to the second measurement module. Thus, in some examples, the driving module is used to control the switch K in the target number of battery branches with a higher SOX ranking to turn on, and control the switch K in the battery branches other than the target number to turn off according to the SOX ranking.

[0181] As an example, the second measurement module is used to determine the order in which the multiple battery branches are put into use according to 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, the state of health, and the state of remaining energy.

[0182] Based on the above description, the control method of the energy storage module in the embodiment of the present application includes the following steps:

[0183] S11. The control device obtains the bus current of the energy storage module through the first measurement module.

[0184] S12: The control device obtains the average available current of the plurality of battery branches and the SOX ranking through the second measurement module. The order of step S12 and step S11 is not specific.

[0185] 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.

[0186] S14. According to the SOX ranking, the control device controls the switches K in the target number of battery branches with higher SOX rankings to turn on through the driving module, and controls the switches K in the battery branches other than the target number to turn off.

[0187] In the control method of the energy storage module, the control device can actively distribute the bus current to the target number of battery branches, realize active distribution of the bus current, and reduce the current pulsation of the battery branches. In addition, the control device can make each battery branch put into use work under the condition close to the available current, which can improve the utilization rate of the battery branch.

[0188] 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 the present application.

[0189] 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.

[0190] 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 aforementioned Figure 2 The description of the illustrated embodiment and other related method embodiments will not be repeated here.

[0191] like Fig.14 As shown, in some embodiments of the present application, the control device includes an acquisition module 141 and a control module 142 .

[0192] The acquisition module 141 is used to acquire the bus current of the energy storage module and the available current of multiple battery branches connected in parallel in the energy storage module. The control module 142 is used to control the target number of battery branches in the multiple battery branches to be put into use according to the bus current and the available current of each battery branch.

[0193] The control device of the energy storage module also has the above beneficial effects, that is, it can actively distribute the bus current to each battery branch in use, realize active distribution of the bus current, and reduce the current pulsation of the battery branch. In addition, it can make each battery branch in use work under the condition close to the available current, and improve the utilization rate of the battery branch.

[0194] Fig.15 Schematic diagram of the structure of a control device provided by an embodiment of the present application. Fig.15 As shown, the control device 1000 of this embodiment includes: at least one processor 150 ( Fig.15 Only one is shown), a memory 151, wherein the memory 151 stores a computer program 152 that can be run on the processor 150. When the processor 150 executes the computer program 152, the steps in the control method embodiment of the energy storage module are implemented, such as Figure 2 Steps S210 to S220 are shown.

[0195] The control device 1000 may be, but is not limited to, a battery management system, a mobile phone, a desktop computer, a notebook, a PDA, a cloud server, etc. 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 Fig.15 It is only an example of the control device 1000 and does not constitute a limitation of the control device 1000. It may include more or fewer components than shown in the figure, or a combination of certain components, or different components. For example, the control device may also include an input sending device, a network access device, a bus, etc.

[0196] The processor 150 may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA), or 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, etc.

[0197] 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 memory card (Smart Media Card, SMC), a secure digital (Secure Digital, SD) card, a flash card (Flash Card), etc. equipped on the control device 1000. Further, 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 (BootLoader), data and other programs, such as the program code of the computer program, etc. The memory 151 may also be used to temporarily store data that has been sent or is to be sent.

[0198] In some embodiments of the present application, an energy storage control system is also provided, including an energy storage module and Fig.15 A control device 1000 is shown.

[0199] In some embodiments, the energy storage control system includes Figure 1The energy storage system 2000 shown has an energy storage module 100 and a control device 1000 .

[0200] In some embodiments, the energy storage control system includes Fig.16 The MMC energy storage system shown has energy storage modules.

[0201] Specifically, Fig.16 SM#1, SM#2, ..., SM#n are all energy storage modules. Optionally, these energy storage modules are full-bridge energy storage modules or half-bridge energy storage modules.

[0202] As an example, Fig.16 The MMC energy storage system shown has a three-phase AC busbar, and each phase of the AC busbar is connected to an energy storage module and a reactor that are symmetrically arranged up and down.

[0203] In some embodiments, the energy storage control system includes Fig.17 The DC direct-hung energy storage system with energy storage modules is shown.

[0204] Specifically, Fig.17 SM#1, SM#2, ..., SM#n 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, Fig.17 The DC direct-mounted energy storage system shown also includes a reactor, a starting resistor and an isolating switch connected in series with the energy storage module.

[0206] In some embodiments, the energy storage control system includes Fig.18 The AC direct-mounted energy storage system with energy storage modules is shown.

[0207] Specifically, Fig.18 SM#1, SM#2, ..., SM#n 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, Fig.18 The AC direct-mounted energy storage system shown has a three-phase AC bus, and each phase of the AC bus is connected to an energy storage module and a reactor.

[0209] In some embodiments, the energy storage control system includes Fig.19 The PSC energy storage system with energy storage module shown in FIG. Optionally, the structure of the energy storage module is as follows: Fig.11 shown.

[0210] As an example, the structure of a full-bridge energy storage module is as follows Fig. 20As shown. For example, the full-bridge energy storage module includes a power module and a battery module. The battery module includes a plurality of battery branches connected in parallel. The power module includes two switch bridge arms and a capacitor C. The capacitor C is connected in parallel with the battery branch, and the two switch bridge arms are connected in parallel with the capacitor C respectively.

[0211] As an example, the structure of a half-bridge energy storage module is as follows Fig.21 As shown. For example, the half-bridge energy storage module includes a power module and a battery module. The battery module includes a plurality of battery branches connected in parallel. The power module includes a switch bridge arm and a capacitor C. The capacitor C is connected in parallel with the battery branch, and the switch bridge arm is connected in parallel with the capacitor C.

[0212] 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.

[0213] 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 in the above-mentioned various method embodiments when the computer program product is executed.

[0214] In some embodiments of the present application, a chip system is further provided, the chip system includes a processor, the processor is coupled to a memory, and the processor executes a computer program stored in the memory to implement the steps in the above-mentioned various method embodiments. For example, the chip system can be a single chip, or a chip module composed of multiple chips.

[0215] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0216] Those of ordinary skill 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 to be beyond the scope of this application.

[0217] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0218] The embodiments described above 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, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. An energy storage module, characterized in that: The energy storage module includes a plurality of battery branches connected in parallel with each other, and any of the battery branches includes a switch, and the switch is used to control whether the battery branch is put into use.

2. The energy storage module according to claim 1, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: include: 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; A target number of the battery branches among the plurality of battery branches are controlled to be put into use according to the bus current and the available current of each of the battery branches.

7. The control method according to claim 6, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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 step of determining the order of putting the plurality of battery branches into use according to the magnitude relationship between the first battery states of the respective battery branches comprises: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: include: 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, characterized in that: The invention comprises 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, characterized in that: It comprises an energy storage module and a control device as claimed in claim 17.

19. A computer-readable storage medium, characterized in that: 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.

Images