Energy storage system, control method, device, apparatus, storage medium, and program product

Abstract

The application relates to an energy storage system, a control method and device, equipment, a storage medium and a program product. The energy storage system comprises a plurality of energy storage branches and a control circuit. Each energy storage branch comprises a plurality of battery packs and a plurality of voltage output units. The voltage output by each voltage output unit is a preset value. The control circuit is used for controlling a target energy storage branch in the plurality of energy storage branches to access a target number of voltage output units according to the battery voltage of each energy storage branch. The energy storage system of the application can reduce the influence of the inconsistency of the energy storage branches on the energy storage system, thereby facilitating the improvement of the power of the energy storage system and the prolongation of the service life of the battery packs in the energy storage system.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to an energy storage system, control method, device, equipment, storage medium, and program product. Background Technology

[0002] As electrical equipment requires increasingly larger amounts of electrical energy, energy storage systems contain more and more battery string branches.

[0003] In traditional technologies, energy storage systems typically include multiple parallel battery string branches, each of which can contain multiple battery packs connected in series. As the operating time of the energy storage system increases, differences may gradually emerge among the multiple parallel battery string branches, potentially leading to significant voltage differences between some of them. When a large voltage difference occurs, circulating currents can easily develop between some of the battery string branches during charging and discharging, which not only reduces the power output of the energy storage system but also shortens its lifespan. Summary of the Invention

[0004] In view of the above problems, this application provides an energy storage system, control method, device, equipment, storage medium and program product that can solve the problems of reduced power and service life of energy storage systems in conventional technologies.

[0005] In a first aspect, this application provides an energy storage system, which includes multiple energy storage branches and a control circuit. Each energy storage branch includes multiple battery packs and multiple voltage output units, and the voltage output by each voltage output unit is a preset value.

[0006] The control circuit is used to control the target number of voltage output units to be connected to the target energy storage branch among multiple energy storage branches according to the battery voltage of each energy storage branch.

[0007] In the technical solution of this application embodiment, each energy storage branch may include multiple battery packs connected in series and multiple voltage output units with preset output voltages. The control circuit controls the target energy storage branch to connect to a target number of voltage output units based on the battery voltage of each energy storage branch. Therefore, in this application embodiment, the control circuit controls the target energy storage branch to connect to a target number of voltage output units based on the battery voltage of each energy storage branch, so that the output voltage of the target number of voltage output units can adjust the battery voltage of the target energy storage branch, thereby balancing the battery voltage of the target energy storage branch with that of other energy storage branches. Therefore, the energy storage system of this application embodiment can reduce the impact of inconsistencies in energy storage branches on the energy storage system, thereby improving the power of the energy storage system and extending the service life of the battery packs in the energy storage system.

[0008] In some embodiments, a bypass switch is respectively provided at the first terminal of each voltage output unit;

[0009] The control circuit is specifically used to: control the bypass switches corresponding to the target number of voltage output units in the target energy storage branch to be in the open state according to the battery voltage of each energy storage branch.

[0010] In the technical solution of this application embodiment, the control circuit controls the bypass switches corresponding to the target number of voltage output units in the target energy storage branch to be in the open state, so that the target number of voltage output units are connected to the target energy storage branch. This allows the battery voltage of the target energy storage branch to be adjusted by the output voltage of the target number of voltage output units, thereby balancing the battery voltage of the target energy storage branch with that of other energy storage branches. It is evident that the control method of the control circuit in this application embodiment is relatively simple, which helps to reduce the cost of the energy storage system.

[0011] In some embodiments, the energy storage branch includes a portion of voltage output units that output a positive voltage and another portion of voltage output units that output a negative voltage; or...

[0012] The energy storage branch includes voltage output units that output either a positive or a negative voltage; or,

[0013] Each voltage output unit in the energy storage branch outputs a positive voltage; or,

[0014] Each voltage output unit in the energy storage branch outputs a negative voltage.

[0015] In some embodiments, the voltage values ​​output by each voltage output unit included in the energy storage branch are different; or,

[0016] The voltage values ​​output by each voltage output unit in the energy storage branch are all the same.

[0017] In some embodiments, the second terminal of the voltage output unit is connected to the power supply terminal, and the voltage output unit is used to output a voltage corresponding to a preset value.

[0018] In some embodiments, the power supply terminal includes: a battery pack in the first energy storage branch, a battery pack in the second energy storage branch, a DC bus, or an external power supply, wherein the first energy storage branch is the energy storage branch to which the voltage output unit belongs, and the second energy storage branch is an energy storage branch other than the first energy storage branch among a plurality of energy storage branches.

[0019] In some embodiments, the control circuit is specifically used for:

[0020] Based on the difference between the battery voltages of each energy storage branch, the target energy storage branch and the target number of voltage output units are determined.

[0021] In the technical solution of this application embodiment, the control circuit determines the target energy storage branch and the target number of voltage output units based on the difference between the battery voltages of each energy storage branch, so as to control the target energy storage branch to connect to the target number of voltage output units, thereby balancing the battery voltages of each energy storage branch. Therefore, the energy storage system of this application embodiment can reduce the impact of inconsistencies in energy storage branches on the energy storage system, thereby improving the power of the energy storage system and extending the service life of the battery pack in the energy storage system.

[0022] In some embodiments, the control circuit is specifically used for:

[0023] If the first difference between the battery voltages of the third energy storage branch and the fourth energy storage branch is greater than the first preset threshold, then at least one of the third energy storage branch and the fourth energy storage branch will be identified as the target energy storage branch.

[0024] Based on the difference between the first difference and the first preset threshold, a target number of voltage output units are determined in the target energy storage branch.

[0025] In some embodiments, the control circuit is specifically used for:

[0026] Based on the battery voltage of each energy storage branch and the average battery voltage of each energy storage branch, determine the target energy storage branch and the target number of voltage output units.

[0027] In the technical solution of this application embodiment, the control circuit determines the target energy storage branch and the target number of voltage output units based on the battery voltage of each energy storage branch and the average battery voltage of each energy storage branch. This facilitates controlling the target energy storage branch to connect to the target number of voltage output units, thereby balancing the battery voltage of each energy storage branch. Therefore, the energy storage system of this application embodiment can reduce the impact of inconsistencies in energy storage branches on the energy storage system, thereby improving the power of the energy storage system and extending the service life of the battery pack in the energy storage system.

[0028] In some embodiments, the control circuit is specifically used for:

[0029] If the second difference between the battery voltage of the fifth energy storage branch and the average battery voltage is greater than the second preset threshold, then the fifth energy storage branch is determined as the target energy storage branch.

[0030] Based on the difference between the second difference and the second preset threshold, a target number of voltage output units are determined in the target energy storage branch.

[0031] Secondly, this application also provides a control method for an energy storage system, the method being applied to the energy storage system of any one of the first aspects above, the method comprising:

[0032] Based on the battery voltage of each energy storage branch, control the target energy storage branch among multiple energy storage branches to connect to the target number of voltage output units.

[0033] In some embodiments, based on the battery voltage of each energy storage branch, controlling a target energy storage branch among multiple energy storage branches to connect to a target number of voltage output units includes:

[0034] Based on the battery voltage of each energy storage branch, the bypass switches corresponding to the target number of voltage output units in the target energy storage branch are controlled to be in the open state.

[0035] In some embodiments, based on the battery voltage difference among the multiple energy storage branches, controlling a target energy storage branch among the multiple energy storage branches to connect to a target number of voltage output units includes:

[0036] Based on the difference between the battery voltages of each energy storage branch, the target energy storage branch and the target number of voltage output units are determined.

[0037] In some embodiments, determining a target energy storage branch and a target number of voltage output units based on the difference between the battery voltages of each energy storage branch includes:

[0038] If the first difference between the battery voltages of the third energy storage branch and the fourth energy storage branch is greater than the first preset threshold, then at least one of the third energy storage branch and the fourth energy storage branch will be identified as the target energy storage branch.

[0039] Based on the difference between the first difference and the first preset threshold, a target number of voltage output units are determined in the target energy storage branch.

[0040] In some embodiments, based on the battery voltage of each energy storage branch, controlling a target energy storage branch among multiple energy storage branches to connect to a target number of voltage output units includes:

[0041] Based on the battery voltage of each energy storage branch and the average battery voltage of each energy storage branch, determine the target energy storage branch and the target number of voltage output units.

[0042] In some embodiments, a target energy storage branch and a target number of voltage output units are determined based on the battery voltage of each energy storage branch and the average battery voltage of each energy storage branch, including:

[0043] If the second difference between the battery voltage of the fifth energy storage branch and the average battery voltage is greater than the second preset threshold, then the fifth energy storage branch is determined as the target energy storage branch.

[0044] Based on the difference between the second difference and the second preset threshold, a target number of voltage output units are determined in the target energy storage branch.

[0045] Thirdly, this application also provides a control device for an energy storage system, the device being applied to the energy storage system of any one of the first aspects above, the device comprising:

[0046] The control module is used to control the target number of voltage output units to be connected to the target energy storage branch among multiple energy storage branches according to the battery voltage of each energy storage branch.

[0047] Fourthly, this application also provides an electronic device, which includes a memory and a processor. The memory stores a computer program, and the processor executes the computer program to implement the steps of the method described in any of the second aspects above.

[0048] Fifthly, this application also provides a computer-readable storage medium storing a computer program, which, when executed by a processor, implements the steps of the method described in any of the second aspects above.

[0049] Sixthly, this application also provides a computer program product comprising a computer program that, when executed by a processor, implements the steps of the method described in any of the second aspects above.

[0050] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0051] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0052] Figure 1 This is a schematic diagram of the energy storage system in one embodiment of this application;

[0053] Figure 2 This is a schematic diagram of the energy storage system in another embodiment of this application;

[0054] Figure 3 This is a schematic diagram of the energy storage system in another embodiment of this application;

[0055] Figure 4 This is a schematic diagram of the energy storage system in another embodiment of this application;

[0056] Figure 5 This is a schematic diagram of the energy storage system in another embodiment of this application;

[0057] Figure 6 This is a schematic diagram of the energy storage system in another embodiment of this application;

[0058] Figure 7 This is a schematic diagram of the control logic of the control circuit provided in the embodiments of this application;

[0059] Figure 8 This is a schematic diagram of the structure of an electronic device in one embodiment of this application. Detailed Implementation

[0060] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0061] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the term "comprising" and any variations thereof in the specification, claims and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0062] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0063] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0064] As electrical equipment requires increasingly larger amounts of electrical energy, energy storage systems contain more and more battery string branches.

[0065] In traditional technologies, energy storage systems typically include multiple parallel battery string branches, each of which can contain multiple battery packs connected in series. As the operating time of the energy storage system increases, differences may gradually emerge among the multiple parallel battery string branches, potentially leading to significant voltage differences between some of them. When large voltage differences occur, uneven current phenomena such as circulating currents can easily occur between some battery string branches during charging and discharging, which not only reduces the power of the energy storage system but also shortens the lifespan of the battery packs within the system.

[0066] To address the issue of circulating current caused by significant voltage differences between some battery string branches, the applicant discovered that when a large difference in battery voltage is detected between any battery string branch and other battery string branches, the corresponding number of voltage output units can be connected to that battery string branch to balance the battery voltage of the connected battery string branch with that of other battery string branches.

[0067] It should be understood that the battery voltage balance of at least two energy storage branches involved in the embodiments of this application means that the battery voltage of the at least two energy storage branches is basically the same, that is, the battery voltage of the at least two energy storage branches is basically equal to the DC bus voltage, or the difference between the battery voltage of the at least two energy storage branches is less than a first preset threshold, or the difference between the battery voltage of the at least two energy storage branches and the average battery voltage is less than a second preset threshold.

[0068] Based on the above considerations, the applicant proposes an energy storage system. Each energy storage branch of the system may include multiple battery packs connected in series and multiple voltage output units with preset output voltages. The control circuit controls the target energy storage branch to be adjusted by connecting a target number of voltage output units according to the battery voltage of each energy storage branch. This allows the output voltage of the target number of voltage output units to adjust the battery voltage of the target energy storage branch, thereby balancing the battery voltage of the target energy storage branch with that of other energy storage branches.

[0069] Therefore, the embodiments of this application can avoid the problem of mutual circulating current between multiple energy storage branches during the charging and discharging process, thereby reducing the impact of the inconsistency of battery voltage of the energy storage branches on the energy storage system.

[0070] In one embodiment, Figure 1 This is a schematic diagram of the energy storage system in one embodiment of this application, as shown below. Figure 1 As shown, the energy storage system of this application embodiment may include: a control circuit 10 and a plurality of parallel energy storage branches 11, wherein each energy storage branch 11 may include a plurality of battery packs 110 connected in series and a plurality of voltage output units 111 (for ease of understanding, this is an example). Figure 1(The example shown is that the first energy storage branch is currently connected to two voltage output units 111, the second energy storage branch is currently connected to three voltage output units 111, ..., and the last energy storage branch is currently connected to two voltage output units 111.) The voltage output by each voltage output unit 111 can be a preset value. It should be understood that the battery pack 110 may include one or more battery cells.

[0071] For example, any voltage output unit 111 involved in the embodiments of this application may include a direct current converter (DC-DC); of course, it may also include other units with voltage conversion function, which are not limited in the embodiments of this application.

[0072] The voltage information output by the voltage output unit in the energy storage branch is described in the following embodiments of this application from the aspects of voltage direction and voltage value.

[0073] For example, in any energy storage branch of this application embodiment, each voltage output unit may output a positive voltage, or each voltage output unit may output a negative voltage.

[0074] As another example, in any energy storage branch of this application embodiment, a portion of the voltage output units can output a positive voltage, and another portion of the voltage output units can output a negative voltage, so that the battery voltage of the energy storage branch can be flexibly adjusted.

[0075] As another example, each voltage output unit included in any energy storage branch in the embodiments of this application can output a positive voltage or a negative voltage, so that the battery voltage of the energy storage branch can be flexibly adjusted.

[0076] Optionally, in the embodiments of this application, the voltage output unit can output a positive voltage when the positive voltage switch is in the on state; or the voltage output unit can output a negative voltage when the negative voltage switch is in the on state.

[0077] In the embodiments of this application, the voltage values ​​output by each voltage output unit 111 in any energy storage branch 11 can be the same, or the voltage values ​​output by each voltage output unit 111 in any energy storage branch 11 can be different.

[0078] For example, the voltage values ​​of each voltage output unit in each energy storage branch are the same, and the voltage values ​​of the voltage output units in different energy storage branches are all the same; or, the voltage values ​​of each voltage output unit in each energy storage branch are the same, but the voltage values ​​of the voltage output units in different energy storage branches are different.

[0079] For example, suppose the energy storage system includes three energy storage branches. The voltage value of each voltage output unit in the first energy storage branch is 1V, the voltage value of each voltage output unit in the second energy storage branch is 2V, and the voltage value of each voltage output unit in the third energy storage branch is 3V.

[0080] As another example, the voltage values ​​of each voltage output unit in each energy storage branch are different, but the voltage values ​​of the voltage output units in different energy storage branches are the same.

[0081] For example, suppose the energy storage system includes two energy storage branches. The voltage output unit 11 in the first energy storage branch has a voltage value of 1V, the voltage output unit 12 in the first energy storage branch has a voltage value of 2V, the voltage output unit 21 in the second energy storage branch has a voltage value of 1V, and the voltage output unit 22 in the second energy storage branch has a voltage value of 2V.

[0082] As another example, the voltage values ​​of each voltage output unit in each energy storage branch are different, and the voltage values ​​of the voltage output units in different energy storage branches are different.

[0083] In this embodiment, the control circuit 10 is used to control a target number of voltage output units 111 to be connected to a target energy storage branch among multiple energy storage branches 11, based on the battery voltage of each energy storage branch 11, so as to balance the battery voltage of each energy storage branch 11. It should be understood that the control circuit 10 in this embodiment can acquire the battery voltage of each energy storage branch 11 in real time. The specific acquisition method can refer to the acquisition method in related technologies, and is not limited in this embodiment.

[0084] It should be noted that the target number of voltage output units 111 connected to the target energy storage branch in the embodiments of this application can mean that the target number of voltage output units 111 are connected to the target energy storage branch in a preset connection method so that the battery voltage of the target energy storage branch can be adjusted by the output voltage of the target number of voltage output units 111. The preset connection method may include, but is not limited to, series connection.

[0085] It should be understood that the target number of voltage output units connected to the target energy storage branch in this embodiment refers to the new voltage output units that the target energy storage branch needs to connect to. For example, assuming that the target energy storage branch currently has 2 voltage output units connected, and the target number to be connected is 1, then the target energy storage branch will have a total of 3 voltage output units connected after connecting the target number of voltage output units. Exemplarily, when the control circuit 10 receives a charging request or a discharging request, it can determine the target energy storage branch to be adjusted from multiple energy storage branches 11 based on the acquired battery voltage of each energy storage branch 11, as well as the target number of voltage output units 111 to be connected to the target energy storage branch; furthermore, the control circuit 10 can control the target energy storage branch to connect to the target number of voltage output units 111, so that the battery voltage of the target energy storage branch can be adjusted by the output voltage of the target number of voltage output units 111, so that the battery voltage of the target energy storage branch is balanced with that of other energy storage branches. Therefore, the embodiments of this application can avoid the problem of mutual circulating current between multiple energy storage branches 11 during the charging and discharging process, thereby reducing the impact of inconsistency of energy storage branches on the energy storage system.

[0086] It should be understood that the target energy storage branch in the embodiments of this application refers to the energy storage branch among the multiple energy storage branches 11 whose battery voltage difference relative to other energy storage branches exceeds a difference threshold.

[0087] The following embodiments of this application describe the relevant content of the control circuit determining the target energy storage branch and the target number of voltage output units.

[0088] In one possible implementation, the control circuit 10 can determine the target energy storage branch and the target number of voltage output units based on the difference between the battery voltages of each energy storage branch 11.

[0089] In this implementation, the control circuit 10 can determine at least one energy storage branch among the multiple energy storage branches 11 whose battery voltage difference with other energy storage branches exceeds a first preset threshold as the target energy storage branch to be adjusted, based on the difference between the battery voltages of each energy storage branch 11 and other energy storage branches. The control circuit 10 can also determine the target number of voltage output units based on the degree to which the battery voltage difference between the target energy storage branch and other energy storage branches exceeds the first preset threshold.

[0090] For example, if the first difference between the battery voltages of the third and fourth energy storage branches in the plurality of energy storage branches 11 is greater than a first preset threshold, the control circuit 10 can determine at least one of the third and fourth energy storage branches as a target energy storage branch, and determine a target number of voltage output units in the target energy storage branch according to the difference between the first difference and the first preset threshold.

[0091] For example, assuming the output voltage of each voltage output unit in the energy storage branch is 1V, the first preset threshold is 2V, and the multiple energy storage branches 11 include: energy storage branch A, energy storage branch B, and energy storage branch C, the difference in battery voltage between energy storage branch A and energy storage branch B is 3V, the difference in battery voltage between energy storage branch A and energy storage branch C is 1V, and the difference in battery voltage between energy storage branch C and energy storage branch B is 2V, that is, the difference in battery voltage between energy storage branch A and energy storage branch B is greater than the first preset threshold, then the control circuit 10 can determine energy storage branch B as the target energy storage branch. Furthermore, since the difference in battery voltage between energy storage branch A and energy storage branch B is 1V greater than the first preset threshold, the control circuit 10 can determine that energy storage branch B only needs to be connected to one voltage output unit (i.e., the target number is 1) to balance the battery voltage of energy storage branch B with that of other energy storage branches.

[0092] For example, assuming the output voltage of each voltage output unit in the energy storage branch is -1V, the first preset threshold is 2V, and the multiple energy storage branches 11 include: energy storage branch A, energy storage branch B, and energy storage branch C, the difference in battery voltage between energy storage branch A and energy storage branch B is 3V, the difference in battery voltage between energy storage branch A and energy storage branch C is 1V, and the difference in battery voltage between energy storage branch C and energy storage branch B is 2V, that is, the difference in battery voltage between energy storage branch A and energy storage branch B is greater than the first preset threshold, then the control circuit 10 can determine energy storage branch A as the target energy storage branch. Furthermore, since the difference in battery voltage between energy storage branch A and energy storage branch B is 1V greater than the first preset threshold, the control circuit 10 can determine that energy storage branch A only needs to be connected to one voltage output unit (i.e., the target quantity is 1) to balance the battery voltage of energy storage branch A with other energy storage branches.

[0093] For example, suppose that the multiple energy storage branches 11 include: energy storage branch A, energy storage branch B and energy storage branch C, each energy storage branch includes multiple voltage output units 1 with an output voltage of -0.5V and multiple voltage output units 2 with an output voltage of 0.5V, the first preset threshold is 2V, the difference between the battery voltage of energy storage branch A and energy storage branch B is 3V, the difference between the battery voltage of energy storage branch A and energy storage branch C is 1V, and the difference between the battery voltage of energy storage branch C and energy storage branch B is 2V. That is, the difference between the battery voltage of energy storage branch A and energy storage branch B is greater than the first preset threshold, then the control circuit 10 can determine energy storage branch A as target energy storage branch 1 and energy storage branch B as target energy storage branch 2. Furthermore, since the difference in battery voltage between energy storage branch A and energy storage branch B is 1V greater than the first preset threshold, the control circuit 10 can determine that energy storage branch A only needs to be connected to one voltage output unit 1 (i.e., the target quantity corresponding to target energy storage branch 1 is 1) and energy storage branch B only needs to be connected to one voltage output unit 2 (i.e., the target quantity corresponding to target energy storage branch 2 is 1) to make the battery voltage of energy storage branch A balanced with other energy storage branches.

[0094] It should be understood that any energy storage branch involved in the embodiments of this application (e.g., the third energy storage branch, the fourth energy storage branch, or the target energy storage branch) may represent one energy storage branch or multiple energy storage branches.

[0095] For example, when the target energy storage branch includes multiple energy storage branches, the control circuit 10 can control the multiple energy storage branches to boost or deboost, or boost the voltage of some of the multiple energy storage branches and deboost the voltage of another part of the energy storage branches, based on the difference between the battery voltages of each energy storage branch and a first preset threshold.

[0096] In another possible implementation, the control circuit 10 can determine the target energy storage branch and the target number of voltage output units based on the battery voltage of each energy storage branch 11 and the average battery voltage of each energy storage branch 11.

[0097] In this implementation, the control circuit can determine at least one energy storage branch among the multiple energy storage branches 11 whose difference from the average battery voltage exceeds a second preset threshold as the target energy storage branch to be adjusted, based on the battery voltage of each energy storage branch 11 and the average battery voltage of each energy storage branch 11. The control circuit can also determine the target number of voltage output units based on the degree to which the difference between the target energy storage branch and the average battery voltage exceeds the second preset threshold.

[0098] For example, if the second difference between the fifth energy storage branch and the average battery voltage in the plurality of energy storage branches 11 is greater than the second preset threshold, the control circuit 10 can determine the fifth energy storage branch as the target energy storage branch, and determine the target number of voltage output units in the target energy storage branch according to the difference between the second difference and the second preset threshold.

[0099] For example, assuming the output voltage of each voltage output unit in the energy storage branch is -1V, the second preset threshold is 2V, the average battery voltage is 6V, and the multiple energy storage branches 11 include: energy storage branch A, energy storage branch B, and energy storage branch C, the voltage difference between energy storage branch A and the average battery voltage is 3V, the voltage difference between energy storage branch B and the average battery voltage is -1V, and the voltage difference between energy storage branch C and the average battery voltage is -2V, that is, the voltage difference between energy storage branch A and the average battery voltage is greater than the second preset threshold, then the control circuit 10 can determine electromagnetic cluster branch A as the target energy storage branch. Furthermore, since the voltage difference between energy storage branch A and the average battery voltage is 1V greater than the second preset threshold, the control circuit 10 can determine that energy storage branch A only needs to be connected to one voltage output unit (i.e., the target quantity is 1) to balance the battery voltage of electromagnetic cluster branch A with other energy storage branches.

[0100] It should be noted that other examples of this implementation can be found in the relevant content of the previous implementation method in this application, and will not be repeated here.

[0101] It should be understood that any energy storage branch involved in the embodiments of this application (e.g., the fifth energy storage branch or the target energy storage branch) may represent one energy storage branch or multiple energy storage branches.

[0102] For example, when the target energy storage branch includes multiple energy storage branches, the control circuit 10 can control the multiple energy storage branches to boost or buck the voltage, or boost the voltage of some of the multiple energy storage branches and buck the voltage of others, based on the second difference between the battery voltage of each energy storage branch and the average battery voltage.

[0103] Of course, the control circuit can also determine the target energy storage branch and the target number of voltage output units in other ways, which is not limited in this embodiment.

[0104] It should be noted that the control circuit 10 in this embodiment may include a main controller, or the control circuit 10 may include a main controller and slave controllers corresponding to each energy storage branch 11. The main controller and each slave controller can communicate via a preset communication protocol.

[0105] It should be understood that if the control circuit 10 includes a main controller and slave controllers corresponding to each energy storage branch 11, then after the main controller determines the target energy storage branch and the target number of voltage output units, it can control the slave controllers corresponding to the target energy storage branch to connect to the target number of voltage output units.

[0106] In the aforementioned energy storage system, each energy storage branch may include multiple battery packs connected in series and multiple voltage output units with preset output voltages. The control circuit, based on the battery voltage of each energy storage branch, controls a target energy storage branch to connect to a target number of voltage output units, thereby balancing the battery voltages of each energy storage branch. Therefore, in this embodiment, the control circuit controls the target energy storage branch to connect to a target number of voltage output units based on the battery voltage of each energy storage branch. This allows the output voltage of the target number of voltage output units to adjust the battery voltage of the target energy storage branch, thus balancing the battery voltage of the target energy storage branch with that of other energy storage branches. Therefore, the energy storage system of this embodiment can reduce the impact of inconsistencies in energy storage branches on the energy storage system, thereby improving the power of the energy storage system and extending the lifespan of the battery packs in the energy storage system.

[0107] Furthermore, in this embodiment, the target energy storage branch can be connected to any one or more voltage output units. When one voltage output unit fails, the target energy storage branch can still connect to other voltage output units to adjust the battery voltage of the target energy storage branch, without affecting the battery voltage balance of each energy storage branch in the energy storage system. Therefore, the energy storage system in this embodiment has high system reliability.

[0108] Furthermore, the voltage output by each voltage output unit in the embodiments of this application is a preset value, which not only makes the control method relatively simple, but also facilitates mass production, thereby helping to reduce the cost of the energy storage system.

[0109] In one embodiment, Figure 2 This is a schematic diagram of the energy storage system in another embodiment of this application. Based on the above embodiments, this application describes the method by which the control circuit controls the target energy storage branch to connect to the target number of voltage output units. For example... Figure 2 As shown, each voltage output unit 111 in this embodiment of the application is provided with a bypass switch 112 at its first terminal.

[0110] It should be noted that when the bypass switch 112 corresponding to any voltage output unit 111 is in the ON state, the bypass switch 112 short-circuits the corresponding voltage output unit 111, making the voltage output unit 111 in a bypass state, that is, the voltage output unit 111 is not connected to its corresponding energy storage branch. When the bypass switch 112 corresponding to any voltage output unit 111 is in the OFF state, the voltage output unit 111 is connected in series to its corresponding energy storage branch, that is, the voltage output unit 111 is connected to its corresponding energy storage branch. It should be understood that the default state of the bypass switch 112 in this embodiment can be in the ON state.

[0111] For example, the bypass switch 112 in this embodiment can be a controllable switch. For example, the bypass switch 112 may include, but is not limited to, a relay or a metal-oxide-semiconductor field-effect transistor (MOS transistor).

[0112] In this embodiment, the control circuit 10 can control the bypass switch corresponding to the target number of voltage output units in the target energy storage branch to be in the open state according to the battery voltage of each energy storage branch 11.

[0113] For example, the control circuit 10 can determine the target energy storage branch and the target number of voltage output units based on the battery voltage of each energy storage branch 11, and control the bypass switch 112 corresponding to the target number of voltage output units in the target energy storage branch to be in the open state, so that the target number of voltage output units are connected to the target energy storage branch, so that the battery voltage of the target energy storage branch can be adjusted by the output voltage of the target number of voltage output units.

[0114] It should be understood that any voltage output unit in the embodiments of this application can be in a working state by default. After the bypass switch corresponding to the voltage output unit switches from the on state to the off state, the voltage output unit is connected to the target energy storage branch, thereby adjusting the battery voltage of the target energy storage branch. Alternatively, any voltage output unit in the embodiments of this application can be in a non-working state by default (e.g., idle state or dormant state). When the control circuit controls the bypass switch corresponding to the voltage output unit to switch from the on state to the off state, it also needs to control the voltage output unit to switch from the non-working state to the working state, so that the voltage output unit can be connected to the target energy storage branch to adjust the battery voltage of the target energy storage branch.

[0115] In this embodiment, the control circuit controls the bypass switches corresponding to the target number of voltage output units in the target energy storage branch to be in the open state, thereby connecting the target number of voltage output units to the target energy storage branch. This allows the battery voltage of the target energy storage branch to be adjusted by the output voltage of the target number of voltage output units, thus balancing the battery voltage of the target energy storage branch with that of other energy storage branches. Therefore, the control method of the control circuit in this embodiment is relatively simple, which helps to reduce the cost of the energy storage system.

[0116] In one embodiment, based on the above embodiments, this application describes the power supply method of the arbitrary voltage output unit. The second terminal of the arbitrary voltage output unit 111 in this application embodiment can be connected to the power supply terminal. The voltage output unit is used to output a voltage corresponding to a preset value, so that when the voltage output unit is connected to its corresponding energy storage branch, the battery voltage of the corresponding energy storage branch can be adjusted through the output voltage of the voltage output unit.

[0117] For example, the power supply terminal of any voltage output unit in the embodiments of this application may include, but is not limited to: a battery pack in the first energy storage branch, a battery pack in the second energy storage branch, a DC bus or an external power supply, wherein the first energy storage branch may be the energy storage branch to which the voltage output unit belongs, and the second energy storage branch may be an energy storage branch other than the first energy storage branch among a plurality of energy storage branches.

[0118] Figure 3 This is a schematic diagram of the energy storage system in another embodiment of this application, as shown below. Figure 3 As shown, the second end of any voltage output unit 111 in this embodiment can be connected to both ends of the energy storage branch to which the voltage output unit belongs, that is, the power supply end of the voltage output unit 111 can be the battery pack in the energy storage branch to which the voltage output unit belongs.

[0119] It should be understood that the multiple energy storage branches 10 in the embodiments of this application can be connected in parallel to the load or the power source. If the energy storage system is in a charging state, the multiple energy storage branches 10 can be connected in parallel to the power source; if the energy storage system is in a discharging state, the multiple energy storage branches 10 can be connected in parallel to the load.

[0120] Figure 4 This is a schematic diagram of the energy storage system in another embodiment of this application, as shown below. Figure 4 As shown, in the embodiments of this application, the second end of any voltage output unit 111 can be connected to both ends of an energy storage branch adjacent to the energy storage branch to which the voltage output unit belongs, that is, the power supply end of the voltage output unit 111 can be the battery pack in the energy storage branch adjacent to the energy storage branch to which the voltage output unit belongs.

[0121] Figure 5This is a schematic diagram of the energy storage system in another embodiment of this application, as shown below. Figure 5 As shown, the second end of any voltage output unit 111 in this embodiment can be connected to a DC bus, that is, the power supply end of the voltage output unit 111 can be a DC bus.

[0122] Figure 6 This is a schematic diagram of the energy storage system in another embodiment of this application, as shown below. Figure 6 As shown, the second end of any voltage output unit 111 in this embodiment can be connected to an external power supply, that is, the power supply end of the voltage output unit 111 can be an external power supply.

[0123] Based on the above embodiments, Figure 7 This is a schematic diagram of the control logic of the control circuit provided in the embodiments of this application, such as... Figure 7 As shown, the control logic in this application embodiment may include:

[0124] Step S701: The control circuit obtains the battery voltage of each energy storage branch.

[0125] Step S702: The control circuit determines whether the difference in battery voltage of each energy storage branch exceeds the difference threshold.

[0126] If the battery voltage difference of each energy storage branch does not exceed the difference threshold, then proceed to step S703; if the battery voltage difference of some energy storage branches exceeds the difference threshold, then proceed to step S704.

[0127] Step S703: The control circuit controls the bypass switch corresponding to each voltage output unit to be in the conducting state.

[0128] Step S704: The control circuit determines the target energy storage branch and the target number of voltage output units.

[0129] The voltage output by each voltage output unit in the embodiments of this application is a preset value.

[0130] Step S705: The control circuit controls the bypass switch corresponding to the target number of voltage output units in the target energy storage branch to be in the open state, so that the target number of voltage output units are connected to the target energy storage branch.

[0131] It should be understood that the above steps S701-S705 are a cyclic process until the control circuit detects a stop charging command or a stop discharging command.

[0132] It should be noted that the specific implementation of each step in the embodiments of this application can be referred to the relevant content in the above embodiments of this application, and will not be repeated here.

[0133] In this embodiment, the control circuit determines the target energy storage branch and the target number of voltage output units based on the battery voltage of each energy storage branch. By controlling the bypass switches corresponding to the target number of voltage output units in the target energy storage branch to be in the open state, the target number of voltage output units are connected to the target energy storage branch. This allows the battery voltage of the target energy storage branch to be adjusted through the output voltage of the target number of voltage output units, thus balancing the battery voltage of the target energy storage branch with that of other energy storage branches. Therefore, the energy storage system of this embodiment not only improves the power of the energy storage system and extends the service life of the battery pack, but also, due to the relatively simple control method of the control circuit, reduces the cost of the energy storage system.

[0134] In some embodiments, based on the above embodiments, this application describes a control method for the energy storage system. The control method of the energy storage system in this application can be applied to the energy storage system provided in the above embodiments. The method in this application may include:

[0135] Based on the battery voltage of each energy storage branch, control the target energy storage branch among multiple energy storage branches to connect to the target number of voltage output units.

[0136] In one embodiment, based on the battery voltage of each energy storage branch, controlling a target number of voltage output units to be connected to a target energy storage branch among multiple energy storage branches includes:

[0137] Based on the battery voltage of each energy storage branch, the bypass switches corresponding to the target number of voltage output units in the target energy storage branch are controlled to be in the open state.

[0138] In one embodiment, based on the battery voltage of each energy storage branch, controlling a target number of voltage output units to be connected to a target energy storage branch among multiple energy storage branches includes:

[0139] Based on the difference between the battery voltages of each energy storage branch, the target energy storage branch and the target number of voltage output units are determined.

[0140] In one embodiment, determining the target energy storage branch and the target number of voltage output units based on the difference between the battery voltages of each energy storage branch includes:

[0141] If the first difference between the battery voltages of the third energy storage branch and the fourth energy storage branch is greater than the first preset threshold, then at least one of the third energy storage branch and the fourth energy storage branch will be identified as the target energy storage branch.

[0142] Based on the difference between the first difference and the first preset threshold, a target number of voltage output units are determined in the target energy storage branch.

[0143] In one embodiment, based on the battery voltage of each energy storage branch, controlling a target number of voltage output units to be connected to a target energy storage branch among multiple energy storage branches includes:

[0144] Based on the battery voltage of each energy storage branch and the average battery voltage of each energy storage branch, determine the target energy storage branch and the target number of voltage output units.

[0145] In one embodiment, determining the target energy storage branch and the target number of voltage output units based on the battery voltage of each energy storage branch and the average battery voltage of each energy storage branch includes:

[0146] If the second difference between the battery voltage of the fifth energy storage branch and the average battery voltage is greater than the second preset threshold, then the fifth energy storage branch is determined as the target energy storage branch.

[0147] Based on the difference between the second difference and the second preset threshold, a target number of voltage output units are determined in the target energy storage branch.

[0148] The control method for the energy storage system provided in this application can be applied to the energy storage system provided in the above-mentioned embodiments of this application. The implementation principle and technical effect are similar, and will not be repeated here.

[0149] Based on the same inventive concept, this application also provides a control device for implementing the control method of the energy storage system described above. The solution provided by this device is similar to the solution described in the above method; therefore, the specific limitations in the one or more control device embodiments of the energy storage system provided below can be found in the limitations of the control method for the energy storage system described above, and will not be repeated here.

[0150] In one embodiment, the control device for the energy storage system provided in this application can be applied to the energy storage system in the above embodiments. The control device for the energy storage system in this application embodiment may include:

[0151] The control module is used to control the target number of voltage output units to be connected to the target energy storage branch among multiple energy storage branches according to the battery voltage of each energy storage branch.

[0152] In one embodiment, the control module is specifically used for:

[0153] Based on the battery voltage of each energy storage branch, the bypass switches corresponding to the target number of voltage output units in the target energy storage branch are controlled to be in the open state.

[0154] In one embodiment, the control module includes:

[0155] The first determining unit is used to determine the target energy storage branch and the target number of voltage output units based on the difference between the battery voltages of each energy storage branch.

[0156] In one embodiment, the first determining unit is specifically used for:

[0157] If the first difference between the battery voltages of the third energy storage branch and the fourth energy storage branch is greater than the first preset threshold, then at least one of the third energy storage branch and the fourth energy storage branch will be identified as the target energy storage branch.

[0158] Based on the difference between the first difference and the first preset threshold, a target number of voltage output units are determined in the target energy storage branch.

[0159] In one embodiment, the control module includes:

[0160] The second determining unit is used to determine the target energy storage branch and the target number of voltage output units based on the battery voltage of each energy storage branch and the average battery voltage of each energy storage branch.

[0161] In one embodiment, the second determining unit is specifically used for:

[0162] If the second difference between the battery voltage of the fifth energy storage branch and the average battery voltage is greater than the second preset threshold, then the fifth energy storage branch is determined as the target energy storage branch.

[0163] Based on the difference between the second difference and the second preset threshold, a target number of voltage output units are determined in the target energy storage branch.

[0164] The control device for the energy storage system provided in this application embodiment can be applied to the energy storage system provided in the above embodiments of this application. Its implementation principle and technical effect are similar, and will not be described again here.

[0165] Each module in the control device of the aforementioned energy storage system can be implemented entirely or partially through software, hardware, or a combination thereof. These modules can be embedded in the processor of the electronic device in hardware form or independent of it, or stored in the memory of the electronic device in software form, so that the processor can call and execute the operations corresponding to each module.

[0166] In one embodiment, Figure 8 This is a schematic diagram of the structure of an electronic device in one embodiment of this application, such as... Figure 8As shown, the electronic device provided in this application embodiment may include a processor, a memory, and a communication interface connected via a system bus. The processor of the electronic device provides computing and control capabilities. The memory of the electronic device includes a non-volatile storage medium and internal memory. The non-volatile storage medium stores an operating system and computer programs. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage medium. The communication interface of the electronic device is used for wired or wireless communication with external devices. When the computer program is executed by the processor, it implements the technical solutions in the control method embodiments of the energy storage system described above. Its implementation principle and technical effects are similar and will not be repeated here.

[0167] Those skilled in the art will understand that Figure 8 The structure shown is merely a block diagram of a portion of the structure related to the present application and does not constitute a limitation on the electronic device to which the present application is applied. The specific electronic device may include more or fewer components than shown in the figure, or combine certain components, or have different component arrangements.

[0168] In one embodiment, an electronic device is also provided, including a memory and a processor. The memory stores a computer program, and the processor executes the computer program to implement the technical solution in the control method embodiment of the energy storage system described above. The implementation principle and technical effect are similar, and will not be repeated here.

[0169] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, it implements the technical solution of the control method of the energy storage system described above in this application. Its implementation principle and technical effect are similar, and will not be repeated here.

[0170] In one embodiment, a computer program product is provided, including a computer program that, when executed by a processor, implements the technical solution of the control method of the energy storage system described above in this application. The implementation principle and technical effects are similar and will not be repeated here.

[0171] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium, and when executed, it can include the processes of the embodiments of the above methods. Any references to memory, databases, or other media used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM). The processors involved in the embodiments provided in this application can be general-purpose processors, central processing units, graphics processing units, digital signal processors, programmable logic devices, quantum computing-based data processing logic devices, etc., and are not limited thereto.

[0172] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. An energy storage system, characterized by, The energy storage system comprises a plurality of energy storage branches and a control circuit, each of the energy storage branches comprises a plurality of battery packs and a plurality of voltage output units, each of the voltage output units outputs a voltage of a preset value; a bypass switch is correspondingly arranged at a first end of each of the voltage output units; The control circuit is configured to control a target energy storage branch in the plurality of energy storage branches to access a target number of voltage output units according to battery voltages of the energy storage branches. The control circuit is specifically configured to: determine the target energy storage branch and the target number of voltage output units according to differences between the battery voltages of the energy storage branches; if a first difference between the battery voltages of the third energy storage branch and the fourth energy storage branch is greater than a first preset threshold, at least one of the third energy storage branch and the fourth energy storage branch is determined as the target energy storage branch; determine the target number of voltage output units in the target energy storage branch according to a difference between the first difference and the first preset threshold.

2. The energy storage system of claim 1, wherein, The control circuit is specifically configured to control the bypass switch corresponding to the target number of voltage output units in the target energy storage branch to be in an off state according to the battery voltages of the energy storage branches.

3. The energy storage system of claim 1 or 2, wherein, Part of the voltage output units included in the energy storage branch output positive voltages, and the other part of the voltage output units output negative voltages; or, Each of the voltage output units included in the energy storage branch outputs a positive voltage or a negative voltage; or, Each of the voltage output units included in the energy storage branch outputs a positive voltage; or, Each of the voltage output units included in the energy storage branch outputs a negative voltage.

4. The energy storage system of claim 3, wherein, The voltage values output by each of the voltage output units included in the energy storage branch are different; or, The voltage values output by each of the voltage output units included in the energy storage branch are the same.

5. The energy storage system of claim 1 or 2, wherein, A second end of the voltage output unit is connected with a power supply end, and the voltage output unit is configured to output a voltage corresponding to the preset value.

6. The energy storage system of claim 5, wherein, The power supply end comprises the battery pack in the first energy storage branch, the battery pack in the second energy storage branch, a direct current bus or an external power supply, wherein the first energy storage branch is the energy storage branch to which the voltage output unit belongs, and the second energy storage branch is an energy storage branch other than the first energy storage branch in the plurality of energy storage branches.

7. An energy storage system characterized by, The energy storage system comprises a plurality of energy storage branches and a control circuit, each of the energy storage branches comprises a plurality of battery packs and a plurality of voltage output units, each of the voltage output units outputs a voltage of a preset value; a bypass switch is correspondingly arranged at a first end of each of the voltage output units; The control circuit is configured to control a target energy storage branch in the plurality of energy storage branches to access a target number of voltage output units according to battery voltages of the energy storage branches. The control circuit is specifically configured to: determine the target energy storage branch and the target number of voltage output units according to the battery voltages of the energy storage branches and average battery voltages of the energy storage branches; if a second difference between the battery voltage of the fifth energy storage branch and the average battery voltage is greater than a second preset threshold, the fifth energy storage branch is determined as the target energy storage branch. According to a difference between the second difference value and the second preset threshold value, a target number of voltage output units in the target energy storage branch is determined.

8. The energy storage system of claim 7, wherein, The control circuit is specifically configured to: control, according to the battery voltage of each energy storage branch, a bypass switch corresponding to the target number of voltage output units in the target energy storage branch to be in an open state.

9. An energy storage system according to claim 7 or 8, characterised in that, The energy storage branch includes a part of the voltage output units outputting positive voltages and another part of the voltage output units outputting negative voltages; or The energy storage branch includes each of the voltage output units outputting positive voltages or negative voltages; or The energy storage branch includes each of the voltage output units outputting positive voltages; or The energy storage branch includes each of the voltage output units outputting negative voltages.

10. The energy storage system of claim 9, wherein, The energy storage branch includes each of the voltage output units outputting voltages of different values; or The energy storage branch includes each of the voltage output units outputting voltages of the same value.

11. The energy storage system of claim 7 or 8, wherein, The second end of the voltage output unit is connected with a power supply end, and the voltage output unit is configured to output a voltage corresponding to a preset value.

12. The energy storage system of claim 11, wherein, The power supply end includes: a battery pack in a first energy storage branch, a battery pack in a second energy storage branch, a direct current bus, or an external power supply, where the first energy storage branch is an energy storage branch to which the voltage output unit belongs, and the second energy storage branch is an energy storage branch other than the first energy storage branch among the plurality of energy storage branches.

13. A control method of an energy storage system, characterized by, The method is applied to the energy storage system according to any one of claims 1-12, and the method comprises: According to the battery voltage of each energy storage branch, the target energy storage branch among the plurality of energy storage branches is controlled to access the target number of voltage output units.

14. A control device for an energy storage system, characterized by The device is applied to the energy storage system according to any one of claims 1-12, and the device comprises: A control module is configured to: according to the battery voltage of each energy storage branch, control the target energy storage branch among the plurality of energy storage branches to access the target number of voltage output units.

15. An electronic device, comprising a memory and a processor, the memory storing a computer program, characterized in that, The processor executes the computer program to implement the steps of the method in claim 13.

16. A computer readable storage medium having stored thereon a computer program, characterized in that, The computer program is executed by the processor to implement the steps of the method in claim 13.

17. A computer program product comprising a computer program, characterized in that, The computer program is executed by the processor to implement the steps of the method in claim 13.

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