Control methods, devices, systems, equipment, media and products for energy storage devices

Abstract

This application relates to a control method, apparatus, system, device, medium, and product for an energy storage device. The method includes: under a first low-power control condition, sending a first low-power command to each secondary controller in the energy storage device through each of a plurality of first optical transmission modules; the first low-power command instructing the secondary controller to shut down a second optical transmission module; identifying the secondary controller with its second optical transmission module shut down as a candidate secondary controller; and shutting down the first optical transmission module connected to the candidate secondary controller among the plurality of first optical transmission modules. This method can improve the operational reliability of the energy storage device by reducing the power consumption of the controllers in the energy storage device.

Description

Technical Field

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

[0002] With the rapid development of the new energy industry, energy storage devices are being used more and more widely. Energy storage devices are usually constructed by combining multiple battery devices, and large-scale energy storage and release are achieved through the coordinated work of the battery devices.

[0003] In related technologies, under high voltage conditions, in order to maintain the operation of the controller in the energy storage device, the battery device in the energy storage device needs to supply power to the controller in the energy storage device.

[0004] However, the controllers in related technologies have high power consumption. When the battery capacity in the energy storage device is low, the battery device still needs to supply power to the high-power controller, which can easily lead to over-discharge risk in the battery cells of the energy storage device, affecting the operational reliability of the energy storage device. Summary of the Invention

[0005] Based on this, this application provides a control method, apparatus, system, equipment, medium, and product for an energy storage device, which can improve the operational reliability of the energy storage device by reducing the power consumption of the controller in the energy storage device.

[0006] In a first aspect, this application provides a control method for an energy storage device, the method comprising: under the condition of satisfying a first low power control condition, sending a first low power command to each secondary controller in the energy storage device through each of a plurality of first optical transmission modules; the first low power command being used to instruct the second optical transmission module of the secondary controller to be turned off; determining the secondary controller whose second optical transmission module is turned off as a candidate secondary controller; and turning off the first optical transmission module among the plurality of first optical transmission modules that is connected to the candidate secondary controller.

[0007] In the technical solution provided in this application embodiment, when the primary controller meets the first low-power control condition, the second optical transmission module of the candidate secondary controller can be controlled to shut down, and the first optical transmission module connected to the candidate secondary controller in the primary controller can be controlled to shut down. This reduces the power consumption of the primary and secondary controllers of the energy storage device by controlling the shutdown of the high-power optical transmission modules in both the primary and secondary controllers. Furthermore, when a candidate secondary controller with a shut-down second optical transmission module is identified, the first optical transmission module connected to the candidate secondary controller in the primary controller is then controlled to shut down. This avoids a mismatch between the shut-down first optical transmission module of the primary controller and the shut-down second optical transmission module of the secondary controller, which could prevent communication between the shut-down primary optical transmission module and the open secondary optical transmission module, or vice versa. The optical transmission module still suffers from ineffective energy consumption. Therefore, by matching the first optical transmission module shut down by the primary controller with the second optical transmission module shut down by the secondary controller, the problem of ineffective energy consumption of the optical transmission module is avoided, further reducing the power consumption of the primary and secondary controllers of the energy storage device. This reduces the risk of over-discharge of the battery cells in the energy storage device and improves the operational reliability of the energy storage device. In addition, by reducing the power consumption of the primary controller, the power consumption of the target battery device supplying power to the primary controller is reduced, thereby reducing the power difference between the target battery device and other battery devices. This avoids the problem that the power difference between the target battery device and other battery devices is too large, which may prevent the target battery device from being connected to high voltage or require excessive charging before the target battery device is connected to high voltage, resulting in low efficiency of the energy storage device when connected to high voltage. Therefore, the embodiments of this application can improve the high voltage connection efficiency of the energy storage device.

[0008] In some embodiments, the method further includes at least one of the following: disconnecting the power supply path of at least one second power device when the first low-power instruction is further configured to instruct disconnecting the power supply path of at least one first power device under the secondary controller; the first power device and the second power device are included in an energy storage device; reducing the power supply power of at least one fourth power device when the first low-power instruction is further configured to instruct reducing the power supply power of at least one third power device under the secondary controller; the third power device and the fourth power device are included in an energy storage device; and entering a low-power mode when the first low-power instruction is further configured to instruct the secondary controller to enter a low-power mode.

[0009] The technical solution provided in this application embodiment controls at least one of the following: disconnecting the power supply path of at least one second electrical device under the primary controller; reducing the power supply power of at least one fourth electrical device under the primary controller; and the primary controller entering a low-power mode, thereby reducing the power consumption of the primary controller and / or the electrical devices under the primary controller. This not only reduces the risk of over-discharge of the cells in the battery device in the energy storage device and improves the operational reliability of the energy storage device, but also reduces the power consumption of the target battery device supplying power to the primary controller and / or the electrical devices under the primary controller, thereby reducing the power difference between the target battery device and other battery devices and improving the high-voltage efficiency of the energy storage device.

[0010] In some embodiments, the method further includes: obtaining a first number of secondary controllers among the candidate secondary controllers and a second number of secondary controllers among all secondary controllers in the energy storage device; and determining at least one of the following based on the first number and the second number: at least one second electrical device, at least one fourth electrical device, and the reduced power supply of each fourth electrical device.

[0011] In the technical solution provided in this application embodiment, the control information of at least one of the second electrical device, the third electrical device, and the reduced power supply is not based on a preset fixed threshold or human experience, but is calculated and judged in real time according to the quantitative relationship between the number of secondary controllers shut down by the second optical transmission module and the total number of secondary controllers, thereby significantly improving the accuracy and adaptability of the control of electrical devices under the primary controller.

[0012] In some embodiments, the method further includes: acquiring the remaining high-voltage duration of the energy storage device and the current operating status data of the target battery device in the energy storage device that supplies power to the primary controller; determining the maximum power supported by the target battery device based on the remaining high-voltage duration and the current operating status data of the target battery device; and determining at least one of the following based on the maximum power supported by the target battery device: at least one second electrical device, at least one fourth electrical device, and the reduced power supply of each fourth electrical device.

[0013] In the technical solution provided in this application embodiment, by obtaining the remaining high-voltage duration of the energy storage device and the current operating status data of the target battery device supplying power to the primary controller, the maximum power supported by the target battery device is determined. Based on this maximum power, at least one of the following can be reasonably and accurately controlled: at least one second electrical device, at least one fourth electrical device, and the power supply power of each fourth electrical device after the reduction. This effectively improves the rationality of power allocation of the target battery device while ensuring continuous power supply to critical electrical devices, and reduces the probability that the target battery device cannot supply power to the electrical devices under the primary controller for the remaining high-voltage duration, thereby improving the power supply reliability of the electrical devices under the primary controller.

[0014] In some embodiments, satisfying the first low-power control condition includes at least one of the following: when the energy storage device is under high voltage, no high-voltage command is received for the energy storage device; a second low-power command is received, which is used to instruct the first optical transmission module to be turned off; the cells in each battery device in the energy storage device are fault-free; the communication link with each secondary controller is fault-free; there is no insulation fault in the energy storage device; and the power module used to supply power to the primary controller is fault-free.

[0015] In the technical solution provided in this application embodiment, by limiting the first-level controller to meet the first low-power control condition, the low-power control of the first-level controller and the low-power control of the second-level controller can both be performed on the basis that the first-level controller meets the set first low-power control condition, thereby improving the reliability of low-power control.

[0016] In some embodiments, the method further includes: receiving low-power control failure information sent by a designated secondary controller; the designated secondary controller includes a secondary controller whose second optical transmission module failed to shut down; determining, based on the low-power control failure information, a target duration between the time when the first low-power instruction is sent to the designated secondary controller next and the current time; and sending the first low-power instruction to the designated secondary controller again at a time interval of the target duration starting from the current time.

[0017] In the technical solution provided in this application embodiment, if there is a secondary controller where the second optical transmission module fails to shut down, the secondary controller where the second optical transmission module fails to shut down is identified as a designated secondary controller. At a time interval of a target duration starting from the current moment, the first low-power instruction is sent again to the designated secondary controller. This not only avoids the problem of signaling resource waste caused by the primary controller immediately sending the first low-power instruction again to the secondary controller when it receives the low-power control failure information sent by the designated secondary controller, which would lead to multiple issuances of the first low-power instruction when the secondary controller has continuous low-power control failures, but also avoids the problem of the secondary controller being unable to enter low-power control and thus having high power consumption if the first low-power instruction is no longer sent to the secondary controller. Therefore, it can reduce the waste of signaling resources while reducing the power consumption of the secondary controller.

[0018] In some embodiments, the method further includes: obtaining periodic detection time windows of candidate secondary controllers; at the beginning of each detection time window, activating a first optical transmission module connected to the candidate secondary controller, and sending a low-power exit command to the candidate secondary controller through the first optical transmission module connected to the candidate secondary controller; obtaining the operating state of the candidate battery device corresponding to the candidate secondary controller within each detection time window; and controlling the state of the first optical transmission module connected to the candidate secondary controller according to the operating state of the candidate battery device.

[0019] In the technical solution provided in this application embodiment, after the first optical transmission module connected to the candidate secondary controller in the primary controller is turned off, a low-power exit command can be sent periodically to the candidate secondary controller so that the primary controller can periodically obtain the working status of the candidate battery device and thus control the state of the first optical transmission module in the primary controller. This avoids the information gap problem caused by the primary controller being unable to obtain the operating status of the candidate battery device due to the long-term shutdown of the first optical transmission module, and also prevents unnecessary power consumption waste caused by the continuous operation of the first optical transmission module. This achieves a balance between the low power consumption requirement and the operating status monitoring requirement.

[0020] In some embodiments, obtaining periodic detection time windows for candidate secondary controllers includes: obtaining the operating status data of candidate battery devices recently sent by the candidate secondary controller; determining the time interval of each detection time window and the time interval between two adjacent detection time windows based on the operating status data of the candidate battery devices; and determining periodic detection time windows based on the time interval of each detection time window and the time interval between two adjacent detection time windows.

[0021] In the technical solution provided in this application embodiment, the time interval of each detection time window and the time interval between two adjacent detection time windows are flexibly determined based on the operating status data of the candidate battery device. For example, when the operating status data of the battery device is stable and in a quasi-normal working state, the detection time interval is automatically extended and the time interval of the detection time window is reduced, thereby reducing the power consumption of the detection equipment under the secondary controller. For another example, when the operating status data of the battery device fluctuates greatly and is in a critical abnormal working state, the detection time interval is automatically reduced and the time interval of the detection time window is extended, which can improve the real-time performance of the operating status data of the battery device. This not only avoids the problem of high power consumption caused by excessive detection of the operating status data of the battery device, but also avoids the problem of insufficient detection leading to failure to detect the working abnormality of the battery device in time. Therefore, while reducing the power consumption of the battery device, the timeliness of abnormal detection is also improved.

[0022] In some embodiments, obtaining the operating status of the candidate battery device corresponding to the candidate secondary controller within each detection time window includes the following: when a low-power exit instruction is used to instruct the activation of the second optical transmission module in the secondary controller, receiving the operating status data of the candidate battery device sent by the candidate secondary controller within each detection time window; determining the operating status of the candidate battery device based on the operating status data of the candidate battery device; when a low-power exit instruction is used to instruct the candidate secondary controller to provide feedback on battery device operating abnormality indication information, if no battery device operating abnormality indication information is received within each detection time window, determining that the candidate battery device is in a normal operating state; if battery device operating abnormality indication information is received from the target controller in the candidate secondary controller within each detection time window, determining that the target battery device corresponding to the target controller in the candidate secondary controller is in an abnormal operating state.

[0023] In the technical solution provided in this application embodiment, when the low-power exit command is used to instruct the activation of the second optical transmission module in the secondary controller, the primary controller determines the operating status of the candidate battery device based on the operating status data of the candidate battery device sent by the candidate secondary controller, thereby improving the reliability of the determined operating status of the candidate battery device; when the low-power exit command is used to instruct the candidate secondary controller to provide feedback on the abnormal operation indication information of the battery device, the primary controller determines the operating status of the candidate battery device based on whether it receives the abnormal operation indication information of the battery device, thereby eliminating the need to activate the second optical transmission module when the candidate secondary controller itself determines that the candidate battery device is operating normally, thus reducing the power consumption of the candidate secondary controller.

[0024] In some embodiments, controlling the state of the first optical transmission module connected to the candidate secondary controller according to the operating state of the candidate battery device includes: when the candidate battery device is in normal operation, turning off the first optical transmission module connected to the candidate secondary controller again at the end of each detection time window; when the target battery device in the candidate battery device is in abnormal operation, starting from the end of each detection time window, keeping the target optical transmission module in the first optical transmission module connected to the candidate secondary controller on, and turning off the optical transmission modules other than the target optical transmission module in the first optical transmission module connected to the candidate secondary controller again; the target optical transmission module corresponds to the target battery device.

[0025] In the technical solution provided in this application embodiment, when the candidate battery device is in normal operation, the first optical transmission module is controlled to be turned off again at the end of each detection time window, thereby reducing the power consumption of the first-level controller; when the target battery device in the candidate battery device is in abnormal operation, the target optical transmission module corresponding to the target battery device is kept in the on state, so that the working status of the target battery device can be obtained in real time, thereby improving the operational reliability of the energy storage device.

[0026] Secondly, this application provides a control method for an energy storage device, the method comprising: receiving a first low-power instruction sent by a primary controller; the first low-power instruction being used to instruct a secondary controller to shut down a second optical transmission module; the primary controller and the secondary controller being included in the energy storage device; shutting down the second optical transmission module of the secondary controller when a second low-power control condition is met, so that the primary controller shuts down a first light-emitting module connected to the secondary controller; and continuing to keep the second optical transmission module of the secondary controller on when the second low-power control condition is not met.

[0027] In the technical solution provided in this application embodiment, when the secondary controller meets the second low power control condition, the second optical transmission module connected to the primary controller in the secondary controller is controlled to be turned off. In this way, by controlling the shutdown of the second optical transmission module with high power consumption in the secondary controller, the power consumption of the secondary controller is reduced, thereby reducing the risk of over-discharge of the battery cells in the energy storage device and improving the operational reliability of the energy storage device.

[0028] In some embodiments, the method further includes at least one of the following: disconnecting the power supply path of at least one first power device when the first low-power instruction is further configured to instruct disconnecting the power supply path of at least one first power device under the secondary controller; the first power device is included in an energy storage device; reducing the power supply power of at least one third power device when the first low-power instruction is further configured to instruct reduction of the power supply power of at least one third power device under the secondary controller; the third power device is included in an energy storage device; and entering a low-power mode when the first low-power instruction is further configured to instruct the secondary controller to enter a low-power mode.

[0029] In the technical solution provided in this application embodiment, the second controller performs corresponding control according to the instruction of the first low-power command, thereby improving the effectiveness of control.

[0030] In some embodiments, satisfying the second low-power control condition includes at least one of the following: when the energy storage device is under high voltage, no high-voltage command for the corresponding battery device is received from the primary controller; the cells in the corresponding battery device are fault-free; the communication link with the primary controller is fault-free; the corresponding high-voltage sampling module is fault-free; and the power supply module for supplying power to the secondary controller is fault-free.

[0031] In the technical solution provided in this application embodiment, by limiting the secondary controller to meet the second low-power control condition, the low-power control of the secondary controller can be carried out on the basis that the secondary controller meets the set second low-power control condition, thereby improving the reliability of low-power control.

[0032] Thirdly, this application provides a control device for an energy storage device, the device comprising: a transmission module, configured to send a first low-power command to each secondary controller in the energy storage device through each of a plurality of first optical transmission modules when a first low-power control condition is met; the first low-power command is used to instruct the second optical transmission module of the secondary controller to be turned off; a determination module, configured to determine the secondary controller whose second optical transmission module is turned off as a candidate secondary controller; and a control module, configured to turn off the first optical transmission module among the plurality of first optical transmission modules that is connected to the candidate secondary controller.

[0033] Fourthly, this application provides a control device for an energy storage device, the device comprising: a transmission module for receiving a first low-power command sent by a primary controller; the first low-power command being used to instruct the secondary controller to shut down a second optical transmission module; the primary controller and the secondary controller being included in the energy storage device; and a control module for shutting down the second optical transmission module of the secondary controller when a second low-power control condition is met, so that the primary controller shuts down a first light-emitting module connected to the secondary controller; and for continuing to keep the second optical transmission module of the secondary controller on when the second low-power control condition is not met.

[0034] Fifthly, this application provides an energy storage device, which includes a primary controller and multiple secondary controllers. The primary controller is used to send a first low-power command to each secondary controller in the energy storage device through each of the first optical transmission modules of the multiple first optical transmission modules when a first low-power control condition is met. The first low-power command is used to instruct the secondary controller to shut down the second optical transmission module of the secondary controller. The primary controller is also used to determine the secondary controller whose second optical transmission module is shut down as a candidate secondary controller. The primary controller is also used to shut down the first optical transmission module connected to the candidate secondary controller among the multiple first optical transmission modules.

[0035] Sixthly, this application provides an energy storage system, including a power conversion device and the aforementioned energy storage device, wherein the power conversion device is connected between a power generation device and an energy storage device.

[0036] In a seventh aspect, this application provides a control device, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to implement the steps of any of the above-described methods.

[0037] Eighthly, this application provides a computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the steps of any of the above methods.

[0038] Ninthly, this application provides a computer program product, including a computer program that, when executed by a processor, implements the steps of any one of the above methods. Attached Figure Description

[0039] To more clearly illustrate the technical solutions in the embodiments of this application or related technologies, the drawings used in the description of the embodiments of this application or related technologies will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0040] Figure 1This is a structural schematic diagram of an energy storage container for some embodiment systems;

[0041] Figure 2 A schematic diagram of the energy storage device provided in the first embodiment;

[0042] Figure 3 A flowchart illustrating the control method for the energy storage device provided in the first embodiment;

[0043] Figure 4 A flowchart illustrating the control method for the energy storage device provided in the second embodiment;

[0044] Figure 5 A flowchart illustrating the control method for the energy storage device provided in the third embodiment;

[0045] Figure 6 A flowchart illustrating the control method for the energy storage device provided in the fourth embodiment;

[0046] Figure 7 A schematic diagram of the communication architecture of an energy storage device provided for some embodiments;

[0047] Figure 8 A schematic diagram of the power supply architecture of an energy storage device provided for some embodiments;

[0048] Figure 9 A flowchart illustrating the control method for the energy storage device provided in the fifth embodiment;

[0049] Figure 10 A schematic diagram of the control device for an energy storage device provided in some embodiments;

[0050] Figure 11 Schematic diagram of the control device for an energy storage device provided in other embodiments;

[0051] Figure 12 A schematic diagram of the energy storage device provided in the second embodiment;

[0052] Figure 13 Schematic diagrams of the energy storage system provided for some embodiments;

[0053] Figure 14 A schematic diagram of the structure of a control device provided for some embodiments. Detailed Implementation

[0054] 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.

[0055] 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 terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0056] 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, "multiple groups" means two or more, and "each" means each of the multiple, unless otherwise explicitly defined.

[0057] 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.

[0058] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0059] Unless otherwise specified, the order of execution steps in the embodiments of this application is not limited. It should also be noted that any step in the embodiments of this application can be executed independently, that is, the execution of any step in the above embodiments does not depend on the execution of other steps.

[0060] Currently, judging from market trends, energy storage devices are being used more and more widely, bringing great convenience to daily production and life. Energy storage devices include multiple battery units, which can be connected in series, parallel, or a combination of series and parallel connections. For example, in the embodiments of this application, multiple battery units are connected in parallel. Each battery unit in the energy storage device can be charged and discharged. By controlling the charging and discharging of each battery unit, large-scale energy storage and release can be achieved. The battery unit is a whole formed by connecting multiple battery packs together. Exemplarily, a battery unit can be obtained by connecting multiple battery packs in series, parallel, or a combination of series and parallel connections.

[0061] The battery device in this application embodiment may also include battery clusters or battery cabinets. For example, a battery device includes multiple battery packs connected in series, each battery pack including multiple cells connected in series, parallel, or mixed series.

[0062] Energy storage devices may include energy storage containers, energy storage power sources, or other devices capable of storing energy. For example, Figure 1 Here are some schematic diagrams of the energy storage container structure of the embodiment system, such as Figure 1 As shown, an energy storage container can be, for example, a regular cuboid structure, where the six faces of the cuboid serve as the six outer walls of the energy storage device. Setting the energy storage device in a cuboid structure facilitates its fixed placement and transportation. Of course, the energy storage device can also have other shapes; for example, at least one wall of the energy storage device may be angled.

[0063] Figure 2 A schematic diagram of the energy storage device provided in the first embodiment is shown below. Figure 2 The energy storage device includes a current collector module and S groups of energy storage modules. Each group of energy storage modules includes a battery unit and a high-voltage box. The high-voltage box includes a pre-charge unit, a positive switch, a negative switch, and a secondary controller. The positive terminal of each battery unit is connected to the current collector module through a pre-charge unit, and the negative terminal of each battery unit is connected to the current collector module through a negative switch, forming a pre-charge circuit (i.e., a circuit where the positive terminal of the battery unit passes through the pre-charge unit, the current collector module, and the negative switch in sequence back to the negative terminal of the battery unit). The positive terminal of each battery unit is also connected to the current collector module through a positive switch, and the negative terminal of each battery unit is connected to the current collector module through a negative switch, forming a high-voltage circuit (i.e., a circuit where the positive terminal of the battery unit passes through the positive switch, the current collector module, and the negative switch in sequence back to the negative terminal of the battery unit). The control terminals of the pre-charge unit, the positive switch, and the negative switch in each group of energy storage modules are all connected to the secondary controller in that group of energy storage modules, so that the secondary controller can control the conduction, disconnection, conduction, and disconnection of the pre-charge circuit, the high-voltage circuit, and the high-voltage circuit in that group of energy storage modules.

[0064] The switches in the embodiments of this application may include relays / circuit breakers, disconnect switches, or metal-oxide-semiconductor field-effect transistor (MOSFET or MOS) switches.

[0065] It should be noted that, Figure 2 This is merely a schematic diagram of the circuit structure of an energy storage device. In other embodiments, the energy storage device may have other circuit structures. For example, a secondary controller can control the conduction state of the pre-charge unit, positive switch, and negative switch of each of the multiple battery devices. The embodiments of this application do not limit the implementation of the energy storage device.

[0066] When the energy storage device is under high voltage, that is, all the battery devices in the energy storage device are under high voltage, meaning that the pre-charge unit, positive switch, and negative switch corresponding to all the battery devices in the energy storage device are disconnected, the controller in the energy storage device (such as the primary controller and the secondary controller) still needs to operate. Therefore, the battery devices in the energy storage device still need to supply power to the high-power controller, which can easily lead to the risk of over-discharge of the battery cells in the energy storage device, affecting the operational reliability of the energy storage device.

[0067] For example, each battery device in the energy storage device can supply power to the secondary controller corresponding to each battery device, and can also supply power to the electrical devices under the secondary controller corresponding to each battery device; at least one battery device in the energy storage device (e.g., the first battery device, the last battery device, or an intermediate battery device) can supply power to the primary controller, and can also supply power to the electrical devices under the primary controller.

[0068] To alleviate the aforementioned problems, research revealed that the primary controller includes multiple first optical transmission modules, each connected to a corresponding secondary controller. This allows the primary controller to send information to a specific secondary controller via each first optical transmission module. Each secondary controller's second optical transmission module is connected to the primary controller, enabling the secondary controller to send information back to the primary controller via its second optical transmission module. However, the high power consumption of the optical transmission modules in both the primary and secondary controllers during information transmission leads to high power consumption in both systems. Disabling the optical transmission modules in the primary and secondary controllers would significantly reduce their power consumption, thereby mitigating the risk of over-discharge in the battery cells of the energy storage device and improving the operational reliability of the energy storage system.

[0069] Figure 3A schematic flowchart of the control method for the energy storage device provided in the first embodiment is shown below. Figure 3 As shown, exemplarily, this method can be applied to a primary controller or a data processing module / processor within a primary controller, and the method includes the following steps:

[0070] S301. Under the condition of satisfying the first low power control condition, the first low power command is sent by each of the multiple first optical transmission modules to each secondary controller in the energy storage device; the first low power command is used to instruct the second optical transmission module of the secondary controller to be turned off.

[0071] The primary controller and the secondary controller are included in the energy storage device.

[0072] The energy storage device in the embodiments of this application may include any of the energy storage devices listed in this application.

[0073] For example, the optical transmitting module of the primary controller and the optical receiving module of the secondary controller are connected by optical fiber, and the optical transmitting module of the secondary controller and the optical receiving module of the primary controller are connected by optical fiber.

[0074] The method in this application embodiment can be performed when the energy storage device is in a state of charging or discharging cutoff. The energy storage device's charging or discharging is cutoff when all battery devices in the energy storage device complete the high-voltage cutoff. For example, if an external device supplies power to the energy storage device before multiple battery devices in the energy storage device complete the high-voltage cutoff, then the completion of the high-voltage cutoff by all battery devices in the energy storage device corresponds to the energy storage device's charging being cut off. As another example, if the energy storage device supplies power to an external device before multiple battery devices in the energy storage device complete the high-voltage cutoff, then the completion of the high-voltage cutoff by all battery devices in the energy storage device corresponds to the energy storage device's discharging being cut off.

[0075] In some embodiments, the control method for the energy storage device may further include the following steps: if the first low-power control condition is not met, continue to turn on each of the first optical transmission modules corresponding to each of the secondary controllers in all the secondary controllers in the energy storage device.

[0076] In some embodiments, the first-level controller satisfying the first low-power control condition may include: the energy storage device being in a low-voltage state. In some embodiments, the first-level controller satisfying the first low-power control condition may include: the energy storage device being in a low-voltage state for a duration greater than or equal to a preset low-voltage duration. In the embodiments of this application, the energy storage device being in a low-voltage state may include all battery devices in the energy storage device being in a low-voltage state, that is, the pre-charge unit, positive switch, and negative switch corresponding to each battery device in the energy storage device are all disconnected.

[0077] In some embodiments, the failure of the primary controller to meet the first low-power control condition may include: the energy storage device being in a high-voltage state. For example, the failure of the primary controller to meet the first low-power control condition may include at least one of the following: the energy storage device being in a high-voltage state; not receiving a second low-power instruction, the second low-power instruction being used to instruct the first optical transmission module to be turned off; a cell in each battery device in the energy storage device being faulty; a communication link with each secondary controller being faulty; an insulation fault in the energy storage device; or a power module for supplying power to the primary controller being faulty. In the embodiments of this application, the energy storage device being in a high-voltage state may include all battery devices in the energy storage device being in a high-voltage state, that is, the positive and negative switches corresponding to each battery device in all battery devices of the energy storage device are closed.

[0078] In this embodiment of the application, the battery device being in a high-voltage state may include the battery device being in a low-voltage state, in which case the battery device cannot exchange energy with external devices; the battery device being in a high-voltage state may also include the battery device being in a high-voltage state, in which case the battery device can exchange energy with external devices.

[0079] For example, the N first optical transmitting modules of the primary controller are connected one-to-one with the N second optical receiving modules of the secondary controller, and the N second optical transmitting modules of the secondary controller are connected one-to-one with the N first optical receiving modules of the primary controller; N is an integer greater than or equal to 2, and N is the total number of secondary controllers in the energy storage device.

[0080] In this embodiment, each secondary controller receives a first low-power instruction. In some embodiments, upon receiving the first low-power instruction, each secondary controller can control the shutdown of the second optical transmission module within the secondary controller. In some embodiments, upon receiving the first low-power instruction, each secondary controller can control the shutdown of the second optical transmission module within the secondary controller if the secondary controller meets a second low-power control condition, and continue to control the startup of the second optical transmission module within the secondary controller if the secondary controller does not meet the second low-power control condition.

[0081] S302, The secondary controller that shuts down the second optical transmission module is identified as the candidate secondary controller.

[0082] The candidate secondary controller may include at least one secondary controller. For example, the candidate secondary controller may be all or some of the secondary controllers in the energy storage device.

[0083] For any secondary controller, upon receiving a first low-power command from the primary controller, when it determines that the secondary controller's second optical transmission module needs to be shut down, in some embodiments, the secondary controller can send an instruction to the primary controller to shut down the second optical transmission module, and then control the shutdown of the second optical transmission module. In this way, the primary controller, upon receiving the instruction from the second optical transmission module, determines that the secondary controller's second optical transmission module is shut down. In other embodiments, the secondary controller does not send any information to the primary controller; instead, the secondary controller directly controls the shutdown of the second optical transmission module. In this way, if the primary controller does not receive any information from the secondary controller within a preset time period, it determines that the secondary controller's second optical transmission module is shut down.

[0084] For any secondary controller, upon receiving a first low-power instruction from the primary controller, if it determines that the secondary controller's second optical transmission module cannot be shut down, the secondary controller can send an indication message indicating that the second optical transmission module has failed to shut down to the primary controller. The primary controller then determines that the secondary controller's second optical transmission module has failed to shut down based on this indication message.

[0085] S303. Shut down the first optical transmission module connected to the candidate secondary controller among multiple first optical transmission modules.

[0086] For example, when the candidate secondary controllers include M secondary controllers, M of the N first optical transmission modules of the primary controller can be shut down, with each of the M first optical transmission modules connected to one of the M secondary controllers. M is an integer greater than or equal to 1. If M is less than N, the primary controller can also keep the other first optical transmission modules (excluding the M first optical transmission modules) active to issue relevant control commands to the secondary optical transmission modules connected to these other first optical transmission modules.

[0087] The primary controller can shut down the first optical transmitting module connected to the candidate secondary controller, and can also control the shutdown / continuous startup of the first optical receiving module connected to the candidate secondary controller. The secondary controller cannot shut down the second optical receiving module connected to the primary controller.

[0088] In some embodiments, the primary controller can continuously control the activation of the third optical transmission module connected to the upper-level control device (e.g., a background monitoring device or a host computer). Thus, when all secondary controllers in the energy storage device are selected as secondary controllers, although the secondary controllers cannot transmit the battery device's operating status information to the primary controller, preventing the primary controller from sending this information to the upper-level control device, the primary controller can still send its own status information and / or the status information of the electrical equipment under its control to the upper-level control device. When only some secondary controllers in the energy storage device are selected as secondary controllers, the secondary controllers whose second optical transmission module fails to deactivate still transmit the battery device's operating status information to the primary controller, enabling the primary controller to send the battery device's operating status information and / or indications of whether the battery device is operating abnormally to the upper-level control device.

[0089] In the technical solution provided in this application embodiment, when the primary controller meets the first low-power control condition, the second optical transmission module of the candidate secondary controller can be controlled to shut down, and the first optical transmission module connected to the candidate secondary controller in the primary controller can be controlled to shut down. This reduces the power consumption of the primary and secondary controllers of the energy storage device by controlling the shutdown of the high-power optical transmission modules in both the primary and secondary controllers. Furthermore, when a candidate secondary controller with a shut-down second optical transmission module is identified, the first optical transmission module connected to the candidate secondary controller in the primary controller is then controlled to shut down. This avoids a mismatch between the shut-down first optical transmission module of the primary controller and the shut-down second optical transmission module of the secondary controller, which could prevent communication between the shut-down primary optical transmission module and the open secondary optical transmission module, or vice versa. The optical transmission module still suffers from ineffective energy consumption. Therefore, by matching the first optical transmission module shut down by the primary controller with the second optical transmission module shut down by the secondary controller, the problem of ineffective energy consumption of the optical transmission module is avoided, further reducing the power consumption of the primary and secondary controllers of the energy storage device. This reduces the risk of over-discharge of the battery cells in the energy storage device and improves the operational reliability of the energy storage device. In addition, by reducing the power consumption of the primary controller, the power consumption of the target battery device supplying power to the primary controller is reduced, thereby reducing the power difference between the target battery device and other battery devices. This avoids the problem that the power difference between the target battery device and other battery devices is too large, which may prevent the target battery device from being connected to high voltage or require excessive charging before the target battery device is connected to high voltage, resulting in low efficiency of the energy storage device when connected to high voltage. Therefore, the embodiments of this application can improve the high voltage connection efficiency of the energy storage device.

[0090] In some embodiments, the method may further include: disconnecting the power supply path of at least one second power device when the first low-power instruction is further used to instruct the disconnection of the power supply path of at least one first power device under the secondary controller; the first power device and the second power device are included in an energy storage device.

[0091] For example, the electrical equipment under each secondary controller can refer to electrical equipment that affects the battery devices controlled by each secondary controller in the energy storage device. For instance, the electrical equipment under a secondary controller can include electrical equipment controlled by the secondary controller and / or electrical equipment communicating with the secondary controller. For example, the electrical equipment under a secondary controller can include at least one of the following: battery device voltage detection equipment, battery device current detection equipment, battery device temperature detection equipment, battery cell voltage detection equipment, battery cell current detection equipment, battery cell temperature detection equipment, battery device insulation detection equipment, etc.

[0092] For example, each of the electrical devices under the aforementioned secondary controller can be connected to the secondary controller / its corresponding battery device via a control switch, so that the secondary controller / its corresponding battery device supplies power to each electrical device under the secondary controller. The control terminal of the control switch is connected to the secondary controller, and the secondary controller can turn the control switch on or off to connect or disconnect the power supply path for the electrical devices under the secondary controller. Alternatively, each electrical device under the secondary controller can be directly connected to the secondary controller, and the secondary controller can stop outputting voltage to the electrical devices under its own power supply, thus disconnecting the power supply path for the electrical devices under the secondary controller.

[0093] At least one first electrical device under the secondary controller can be some or all of the electrical devices listed above under the secondary controller.

[0094] If the energy storage device is under high voltage, that is, the energy storage device is in a state of charging cut-off or discharging cut-off, and the secondary controller meets the second low power consumption control condition, the battery device will not generate large fluctuations in operating status data (such as state of charge and temperature) because it is not under high voltage. Therefore, it is possible to consider controlling the disconnection of the power supply path of at least one first electrical device under the secondary controller to reduce the power consumption of the battery device in the energy storage device that supplies power to the secondary controller.

[0095] For example, the electrical equipment under the primary controller can refer to electrical equipment that affects all battery devices in the energy storage device. For instance, the electrical equipment under the primary controller can include electrical equipment controlled by the primary controller and / or electrical equipment communicating with the primary controller. For example, the electrical equipment under the primary controller can include at least one of the following: device insulation detection equipment, power module detection equipment, voltage detection equipment for the energy storage device output voltage, current detection equipment for the energy storage device output current, dehumidification equipment, fire-fighting equipment, electricity meters, etc. For example, the power module can include a voltage conversion module, and the power module detection equipment can include the power module's voltage detection equipment and / or current detection equipment.

[0096] For example, each of the electrical devices under the aforementioned primary controller can be connected to the primary controller / its corresponding battery device via a control switch, so that the primary controller / its corresponding battery device supplies power to each electrical device under the primary controller. The control terminal of the control switch is connected to the primary controller, and the primary controller can turn the control switch on or off to connect or disconnect the power supply path of the electrical device. Alternatively, each electrical device under the primary controller can be directly connected to the primary controller, and the primary controller can stop outputting voltage to the electrical devices under it, thus disconnecting the power supply path of the electrical devices under the primary controller.

[0097] At least one secondary electrical device under the primary controller can be some or all of the electrical devices listed above under the primary controller.

[0098] If the energy storage device is under high voltage, that is, the energy storage device is in a state of charging cut-off or discharging cut-off, and the first-level controller meets the first low power consumption control condition, the battery device will not generate large fluctuations in operating status data (such as state of charge and temperature) because it is not under high voltage. Therefore, it is possible to consider controlling the disconnection of the power supply path of at least one second electrical device under the first-level controller to reduce the power consumption of the battery device in the energy storage device that supplies power to the first-level controller.

[0099] In some embodiments, the method may further include: reducing the power supply power of at least one fourth device when the first low-power instruction is further configured to instruct a reduction in the power supply power of at least one third device under the secondary controller; the third and fourth devices are included in an energy storage device.

[0100] At least one third electrical device under the secondary controller can be some or all of the electrical devices listed above under the secondary controller. In some embodiments, at least one third electrical device under the secondary controller can be connected to the secondary controller so that the secondary controller can configure operating parameters to the third electrical device.

[0101] For example, when the third electrical device includes at least one detection device among the electrical devices listed above under the secondary controller, the secondary controller can control the reduction of the sampling frequency of the detection device to reduce the power supply power of at least one third electrical device under the secondary controller. For example, the secondary controller can determine the reduced sampling frequency of at least one third electrical device based on the power supply priority ranking of at least one third electrical device.

[0102] At least one fourth electrical device under a primary controller can be some or all of the electrical devices listed above under a primary controller. In some embodiments, at least one fourth electrical device under a primary controller can be connected to the primary controller so that the primary controller can configure operating parameters to the fourth electrical device.

[0103] For example, when the fourth electrical device includes at least one detection device among the electrical devices listed above under the primary controller, the primary controller can control the reduction of the sampling frequency of the detection device to reduce the power supply of the at least one fourth electrical device under the primary controller. For example, the primary controller can determine the reduced sampling frequency of the at least one fourth electrical device based on the power supply priority ranking of the at least one fourth electrical device.

[0104] For example, when the fourth electrical device includes at least one of the dehumidifier, fire-fighting device, electricity meter, etc. listed above, the primary controller can control the reduction of the operating power of these devices to reduce the power supply of at least one fourth electrical device under the primary controller.

[0105] In some embodiments, the method may further include: entering a low-power mode if the first low-power instruction is also used to instruct the secondary controller to enter a low-power mode.

[0106] Entering a low-power mode for a primary or secondary controller can include putting the primary or secondary controller into a sleep mode, thereby reducing the power consumption of the primary or secondary controller.

[0107] Specifically, when the primary controller enters low-power mode, it can enter normal operating mode upon receiving a low-power exit command from the upper-level control device. Similarly, when the secondary controller enters low-power mode, it can enter normal operating mode upon receiving a low-power exit command from the primary controller.

[0108] In some embodiments, the actions of controlling the disconnection of the power supply path to the second electrical device and / or controlling the reduction of the power supply power of the fourth electrical device are independent of the actions of controlling the shutdown of the first optical transmitting module. That is, the primary controller can control the disconnection of the power supply path to the second electrical device and / or control the reduction of the power supply power of the fourth electrical device regardless of whether the first optical transmitting module is shut down. In other embodiments, the primary controller can only control the disconnection of the power supply path to the second electrical device and / or control the reduction of the power supply power of the fourth electrical device after the first optical transmitting module has been disconnected.

[0109] The technical solution provided in this application embodiment controls at least one of the following: disconnecting the power supply path of at least one second electrical device under the primary controller; reducing the power supply power of at least one fourth electrical device under the primary controller; and the primary controller entering a low-power mode, thereby reducing the power consumption of the primary controller and / or the electrical devices under the primary controller. This not only reduces the risk of over-discharge of the cells in the battery device in the energy storage device and improves the operational reliability of the energy storage device, but also reduces the power consumption of the target battery device supplying power to the primary controller and / or the electrical devices under the primary controller, thereby reducing the power difference between the target battery device and other battery devices and improving the high-voltage efficiency of the energy storage device.

[0110] In some embodiments, the method may further include: obtaining a first number of secondary controllers among the candidate secondary controllers and a second number of secondary controllers among all secondary controllers in the energy storage device; and determining at least one of the following based on the first number and the second number: at least one second electrical device, at least one fourth electrical device, and the reduced power supply of each fourth electrical device.

[0111] In some implementations, at least one of the following can be determined based on the ratio of the first quantity to the second quantity, or based on the difference between the second quantity and the first quantity: at least one second electrical device, at least one fourth electrical device, and the reduced power supply of each fourth electrical device.

[0112] For example, when the first quantity is large, it indicates that the number of secondary controllers that the second optical transmission module is shut down is large. At this time, only a small number of secondary controllers and the electrical devices under these small number of secondary controllers need to operate. As a result, the number of secondary controllers that do not meet the low power consumption control conditions is low, and the operation reliability of the energy storage device is high. Thus, at least one of the following can be performed: controlling a large number of electrical devices under the primary controller to disconnect the power supply; controlling a large number of electrical devices under the primary controller to operate at a reduced operating power, with a large power reduction value.

[0113] For example, when the first number is small, it indicates that the number of secondary controllers that the second optical transmission module is turned off is small. At this time, there are more secondary controllers and the electrical devices under the more secondary controllers that need to operate. As a result, the number of secondary controllers that do not meet the low power consumption control conditions is high, and the operational reliability of the energy storage device is low. Therefore, at least one of the following can be performed: control the fewer electrical devices under the primary controller to disconnect the power supply; control the fewer electrical devices under the primary controller to operate at a reduced operating power, with a smaller power reduction value.

[0114] In the technical solution provided in this application embodiment, the control information of at least one of the second electrical device, the third electrical device, and the reduced power supply is not based on a preset fixed threshold or human experience, but is calculated and judged in real time according to the quantitative relationship between the number of secondary controllers shut down by the second optical transmission module and the total number of secondary controllers, thereby significantly improving the accuracy and adaptability of the control of electrical devices under the primary controller.

[0115] In some embodiments, the method may further include: acquiring the remaining high-voltage duration of the energy storage device and the current operating status data of the target battery device in the energy storage device that supplies power to the primary controller; determining the maximum power supported by the target battery device based on the remaining high-voltage duration and the current operating status data of the target battery device; and determining at least one of the following based on the maximum power supported by the target battery device: at least one second electrical device, at least one fourth electrical device, and the reduced power supply of each fourth electrical device.

[0116] For example, the current operating status data of the target battery device may include at least one of the following: the current remaining power of the target battery device, the current state of charge of the target battery device, the current temperature of the target battery device, etc.

[0117] In some embodiments, the maximum discharge capacity of the target battery device can be determined based on the current operating state data and the minimum operating state data of the target battery device; and the maximum power supported by the target battery device can be determined based on the maximum discharge capacity and the remaining high voltage duration.

[0118] In some embodiments, determining the maximum power supported by the target battery device based on the maximum dischargeable capacity and the remaining high-voltage duration may include: determining the total duration of the detection time windows and the total duration of the non-detection time windows within the remaining high-voltage duration based on the remaining high-voltage duration and the time interval between each detection time window in the periodic detection time windows of the candidate secondary controller and the time interval between two adjacent detection time windows; determining a first maximum power supported by the target battery device within the detection time windows based on the maximum dischargeable capacity, the total duration of the detection time windows within the remaining high-voltage duration, and the total duration of the non-detection time windows; and determining a second maximum power supported by the target battery device within the non-detection time windows; and determining the first maximum power supported by the target battery device and the second maximum power supported by the target battery device as the maximum power supported by the target battery device.

[0119] In some embodiments, at least one of the following can be determined based on the maximum power supported by the target battery device, the operating power (e.g., rated operating power and / or minimum operating power) of each electrical device under the primary controller, and the power supply priority of each electrical device under the primary controller: at least one second electrical device, at least one fourth electrical device, and the reduced power supply of each fourth electrical device.

[0120] In the technical solution provided in this application embodiment, by obtaining the remaining high-voltage duration of the energy storage device and the current operating status data of the target battery device supplying power to the primary controller, the maximum power supported by the target battery device is determined. Based on this maximum power, at least one of the following can be reasonably and accurately controlled: at least one second electrical device, at least one fourth electrical device, and the power supply power of each fourth electrical device after the reduction. This effectively improves the rationality of power allocation of the target battery device while ensuring continuous power supply to critical electrical devices, and reduces the probability that the target battery device cannot supply power to the electrical devices under the primary controller for the remaining high-voltage duration, thereby improving the power supply reliability of the electrical devices under the primary controller.

[0121] In some embodiments, the primary controller satisfies a first low-power control condition, including at least one of the following:

[0122] When the energy storage device is under high voltage, no high voltage command is received from the energy storage device.

[0123] The second low-power instruction is obtained, which is used to instruct the first optical transmission module to be turned off.

[0124] The cells in each battery unit of the energy storage device are fault-free;

[0125] The communication links between each secondary controller are fault-free;

[0126] The energy storage device has no insulation faults;

[0127] The power module used to supply power to the primary controller is fault-free.

[0128] During implementation, the first-level controller meeting the first low-power control condition may include meeting some of the above conditions, or may include meeting all of the above conditions.

[0129] For example, the high-voltage command for the energy storage device can be sent from the upper-level control device to the first-level controller. For example, the second low-power command can be sent from the upper-level control device to the first-level controller.

[0130] In some implementations, if a cell in a battery device is faulty / abnormal, it is necessary to continuously monitor the operating status data of the faulty cell. If the energy storage device is configured as a secondary controller that needs to report the operating status data of the cell to the primary controller so that the primary controller can send it to the upper-level control device, then the secondary controller corresponding to the battery device needs to continuously control the activation of the detection equipment of the battery device and the detection equipment of the cell, and send the detected data to the primary controller through the optical transmission module of the secondary controller.

[0131] In some implementations, if the communication link between the primary controller and a secondary controller fails, the primary controller will not be able to receive the indication information that the secondary controller has failed to shut down the second optical transmission module. Instead, the primary controller will mistakenly believe that the secondary controller's second optical transmission module is shut down, thereby avoiding the problem of misoperation by the primary controller.

[0132] In some embodiments, if the energy storage device has an insulation fault, and / or the power module used to supply power to the primary controller has a fault, it is necessary to continuously monitor the insulation status of the energy storage device and continuously monitor the status of the power module. Therefore, the primary controller cannot control the shutdown of the device insulation detection equipment and / or the power module detection equipment in the energy storage device.

[0133] In the technical solution provided in this application embodiment, by limiting the first-level controller to meet the first low-power control condition, the low-power control of the first-level controller and the low-power control of the second-level controller can both be performed on the basis that the first-level controller meets the set first low-power control condition, thereby improving the reliability of low-power control.

[0134] Figure 4 A flowchart illustrating the control method for the energy storage device provided in the second embodiment is shown below. Figure 4 As shown, exemplarily, this method can be applied to a primary controller or a data processing module / processor within a primary controller. Figure 4 Compared to the example Figure 3 The difference in the embodiments is that after S301, S304 to S306 may also be included.

[0135] S304. Receive low-power control failure information sent by a designated secondary controller; the designated secondary controller includes the secondary controller whose second optical transmission module failed to shut down.

[0136] The designated secondary controller can include one or more secondary controllers. For example, the designated secondary controller can be a secondary controller other than the candidate secondary controllers among all secondary controllers.

[0137] For example, the low-power control failure information may include the current reason for the low-power control failure of the secondary controller. For example, the current reason may include at least one of the following: the corresponding battery device's operating status data is faulty / abnormal, the corresponding battery device's cell's operating status data is faulty / abnormal, the communication link with the primary controller is faulty, the corresponding battery device has an insulation fault, or the power module supplying power to the secondary controller is faulty, etc.

[0138] S305. Based on the low-power control failure information, determine the target duration between the time when the first low-power command is sent to the designated secondary controller next and the current time.

[0139] In some embodiments, the target duration between the time when the first low-power command is sent to the designated secondary controller next and the current time can be determined based on the current reason for the low-power control failure.

[0140] In some implementations, a mapping relationship between each low-power control failure reason and its corresponding duration can be obtained among multiple low-power control failure reasons, and the target duration corresponding to the current low-power control failure reason can be determined based on the mapping relationship.

[0141] For example, the time when the first low-power command is sent to the specified secondary controller next can include the time when the specified secondary controller successfully achieves low-power control. For instance, the time when low-power control is successful can include: the earliest time when low-power control is successful, the intermediate time (the average of the earliest time and the latest time), and the latest time.

[0142] For example, the time when the first low-power instruction is sent to the specified secondary controller next may include the time when the high voltage of the battery device corresponding to the specified secondary controller is completed, or the time when the high voltage of the battery device corresponding to the specified secondary controller is completed and continues for a specified duration.

[0143] S306. At a time interval of the target duration starting from the current moment, send the first low-power instruction to the designated secondary controller again.

[0144] In the technical solution provided in this application embodiment, if there is a secondary controller where the second optical transmission module fails to shut down, the secondary controller where the second optical transmission module fails to shut down is identified as a designated secondary controller. At a time interval of a target duration starting from the current moment, the first low-power instruction is sent again to the designated secondary controller. This not only avoids the problem of signaling resource waste caused by the primary controller immediately sending the first low-power instruction again to the secondary controller when it receives the low-power control failure information sent by the designated secondary controller, which would lead to multiple issuances of the first low-power instruction when the secondary controller has continuous low-power control failures, but also avoids the problem of the secondary controller being unable to enter low-power control and thus having high power consumption if the first low-power instruction is no longer sent to the secondary controller. Therefore, it can reduce the waste of signaling resources while reducing the power consumption of the secondary controller.

[0145] Figure 5 A flowchart illustrating the control method for the energy storage device provided in the third embodiment is shown below. Figure 5 As shown, exemplarily, this method can be applied to a primary controller or a data processing module / processor within a primary controller. Figure 5 Compared to the example Figure 3 The difference in the embodiments is that after S303, S307 to S310 may also be included.

[0146] S307. Obtain the periodic detection time window of the candidate secondary controller.

[0147] For example, when the candidate secondary controller includes multiple secondary controllers, the periodic detection time windows of different secondary controllers may be the same or different. For instance, the time interval of each detection time window and the time interval between two adjacent detection time windows may be the same or at least different for different secondary controllers.

[0148] In some embodiments, the determined completion time of the candidate secondary controller can be obtained, and based on the determined completion time of the candidate secondary controller, combined with the time interval of each detection time window of the candidate secondary controller and the time interval between two adjacent detection time windows, the periodic detection time window of the candidate secondary controller can be determined.

[0149] S308. At the beginning of each detection time window, the first optical transmission module connected to the candidate secondary controller is turned on, and a low-power exit command is sent to the candidate secondary controller through the first optical transmission module connected to the candidate secondary controller.

[0150] When the candidate secondary controller receives a low-power exit command, the candidate secondary controller may perform at least one of the following: control the second optical transmission module connected to the primary controller in the candidate secondary controller to turn on; control the opening of the power supply path of at least one first power-consuming device under the secondary controller; control the switching of the power supply power of at least one third power-consuming device under the secondary controller to the rated power supply power; and control the secondary controller to exit the low-power mode.

[0151] S309. Obtain the working status of the candidate battery device corresponding to the candidate secondary controller within each detection time window.

[0152] For any given battery device, its operating state can include a normal operating state or an abnormal operating state. The normal operating state can include a quasi-normal operating state and a critical normal operating state.

[0153] For example, the operating status of the candidate battery device can be sent by the candidate secondary controller, or the operating status of the candidate battery device can be determined based on the operating status data of the candidate battery device sent by the secondary controller.

[0154] S310. Based on the operating status of the candidate battery device, control the status of the first optical transmission module connected to the candidate secondary controller.

[0155] In the technical solution provided in this application embodiment, after the first optical transmission module connected to the candidate secondary controller in the control primary controller is turned off, a low-power exit command can be periodically sent to the candidate secondary controller so that the primary controller can periodically obtain the working status of the candidate battery device, thereby controlling the state of the first optical transmission module in the primary controller. This avoids the information gap problem caused by the primary controller being unable to obtain the operating status of the candidate battery device due to the long-term shutdown of the first optical transmission module, and also prevents unnecessary power consumption waste caused by the continuous operation of the first optical transmission module, thus achieving a balance between low power consumption requirements and operating status monitoring requirements.

[0156] In some embodiments, obtaining periodic detection time windows for candidate secondary controllers includes: obtaining the operating status data of candidate battery devices recently sent by the candidate secondary controller; determining the time interval of each detection time window and the time interval between two adjacent detection time windows based on the operating status data of the candidate battery devices; and determining periodic detection time windows based on the time interval of each detection time window and the time interval between two adjacent detection time windows.

[0157] For example, when the energy storage device is configured to send the operating status data of the battery device to the primary controller as a candidate secondary controller, the most recently sent operating status data of the candidate battery device is: the operating status data sent by the candidate battery device acquired in the previous detection time window.

[0158] For example, the energy storage device is configured such that before the secondary controller successfully controls low power consumption, the secondary controller sends the battery device's operating status data to the primary controller. After the secondary controller successfully controls low power consumption, the candidate secondary controller sends the battery device's operating status to the primary controller (thereby reducing power consumption). The most recently sent candidate battery device's operating status data is the last time the secondary controller sent the battery device's operating status data to the primary controller before the secondary controller successfully controlled low power consumption.

[0159] The operating status data of the candidate battery device most recently sent by the candidate secondary controller can be the operating status data of the candidate battery device when it is working normally. An example is given below:

[0160] In some implementations, the operating status data of the candidate battery device during normal operation may include operating status data during quasi-normal operation and operating status data during critical normal operation. The range of operating status data during critical normal operation lies between the range of operating status data during quasi-normal operation and the range of operating status data during abnormal operation.

[0161] If the operating status data of the candidate battery device is within the range of its near-normal operating status, and the maximum change in the operating status data of the candidate battery device is lower than the preset change, then a shorter time interval for each detection time window and a larger time interval between two adjacent detection time windows can be set. If the operating status data of the candidate battery device is within the range of its critical normal operating status, and the maximum change in the operating status data of the candidate battery device is higher than or equal to the preset change, then a longer time interval for each detection time window and a smaller time interval between two adjacent detection time windows can be set.

[0162] If the operating status data of the candidate battery device is within the range of its near-normal operating status, and the highest change in the operating status data of the candidate battery device is higher than or equal to a preset change, then a longer time interval for each detection time window and a larger time interval between two adjacent detection time windows can be set. If the operating status data of the candidate battery device is within the range of its critical normal operating status, and the highest change in the operating status data of the candidate battery device is lower than a preset change, then a shorter time interval for each detection time window and a smaller time interval between two adjacent detection time windows can be set.

[0163] In the technical solution provided in this application embodiment, the time interval of each detection time window and the time interval between two adjacent detection time windows are flexibly determined based on the operating status data of the candidate battery device. For example, when the operating status data of the battery device is stable and in a quasi-normal working state, the detection time interval is automatically extended and the time interval of the detection time window is reduced, thereby reducing the power consumption of the detection equipment under the secondary controller. For another example, when the operating status data of the battery device fluctuates greatly and is in a critical abnormal working state, the detection time interval is automatically reduced and the time interval of the detection time window is extended, which can improve the real-time performance of the operating status data of the battery device. This not only avoids the problem of high power consumption caused by excessive detection of the operating status data of the battery device, but also avoids the problem of insufficient detection leading to failure to detect the working abnormality of the battery device in time. Therefore, while reducing the power consumption of the battery device, the timeliness of abnormal detection is also improved.

[0164] In some embodiments, obtaining the operating status of the candidate battery device corresponding to the candidate secondary controller within each detection time window includes: receiving the operating status data of the candidate battery device sent by the candidate secondary controller within each detection time window when a low-power exit instruction is used to instruct the activation of the second optical transmission module in the secondary controller; and determining the operating status of the candidate battery device based on the operating status data of the candidate battery device.

[0165] For example, when a low-power exit command is used to instruct the activation of the second optical transmission module in the secondary controller connected to the primary controller, the candidate secondary controller, upon receiving the low-power exit command, activates the second optical transmission module in the secondary controller connected to the primary controller and transmits the acquired operating status data of the candidate battery device to the primary controller through the second optical transmission module.

[0166] In this way, before and after the first optical transmission module is turned off, the secondary controller sends the battery device's operating status data to the primary controller, thereby improving the consistency of data processing.

[0167] In some embodiments, obtaining the operating status of the candidate battery device corresponding to the candidate secondary controller within each detection time window includes: when a low-power exit instruction is used to instruct the candidate secondary controller to provide feedback on battery device operation abnormality indication information, if no battery device operation abnormality indication information is received within each detection time window, it is determined that the candidate battery device is in normal operating state; if a battery device operation abnormality indication information is received from the target controller among the candidate secondary controllers within each detection time window, it is determined that the target battery device corresponding to the target controller among the candidate secondary controllers is in abnormal operating state.

[0168] For example, when a low-power exit command is used to instruct the candidate secondary controller to provide feedback on abnormal battery device operation, upon receiving the low-power exit command, the candidate secondary controller may not activate the second optical transmission module connected to the primary controller. However, it may perform at least one of the following: activate the power supply path of at least one first electrical device under the secondary controller; switch the power supply power of at least one third electrical device under the secondary controller to its rated power; exit the low-power mode; and, upon detecting abnormal operating status data of the candidate battery device, activate the second optical transmission module and transmit the abnormal battery device operation indication information through the second optical transmission module. Wherein, if the candidate secondary controller detects normal operating status data of the candidate battery device, it continues to monitor the operating status data of the candidate battery device without activating its second optical transmission module.

[0169] In this way, after the primary controller shuts down the first optical transmission module, it does not need to send the battery device's operating status data to the primary controller. Instead, the secondary controller determines whether the battery device's operating status is abnormal. Only when the target battery device's operating status is abnormal will the secondary controller activate the target controller's second optical transmission module, so that the target controller sends the target battery device's abnormal operation indication information to the primary controller. This avoids the secondary controller activating the second optical transmission module as much as possible, thereby reducing the power consumption of the secondary controller.

[0170] In the technical solution provided in this application embodiment, when the low-power exit command is used to instruct the activation of the second optical transmission module in the secondary controller, the primary controller determines the operating status of the candidate battery device based on the operating status data of the candidate battery device sent by the candidate secondary controller, thereby improving the reliability of the determined operating status of the candidate battery device; when the low-power exit command is used to instruct the candidate secondary controller to provide feedback on the abnormal operation indication information of the battery device, the primary controller determines the operating status of the candidate battery device based on whether it receives the abnormal operation indication information of the battery device, thereby eliminating the need to activate the second optical transmission module when the candidate secondary controller itself determines that the candidate battery device is operating normally, thus reducing the power consumption of the candidate secondary controller.

[0171] In some embodiments, controlling the state of the first optical transmission module connected to the candidate secondary controller according to the operating state of the candidate battery device includes: when the candidate battery device is in normal operation, turning off the first optical transmission module connected to the candidate secondary controller again at the end of each detection time window; when the target battery device in the candidate battery device is in abnormal operation, starting from the end of each detection time window, keeping the target optical transmission module in the first optical transmission module connected to the candidate secondary controller on, and turning off the optical transmission modules other than the target optical transmission module in the first optical transmission module connected to the candidate secondary controller again; the target optical transmission module corresponds to the target battery device.

[0172] In the technical solution provided in this application embodiment, when the candidate battery device is in normal operation, the first optical transmission module is controlled to be turned off again at the end of each detection time window, thereby reducing the power consumption of the first-level controller; when the target battery device in the candidate battery device is in abnormal operation, the target optical transmission module corresponding to the target battery device is kept in the on state, so that the working status of the target battery device can be obtained in real time, thereby improving the operational reliability of the energy storage device.

[0173] Figure 6 A flowchart illustrating the control method for the energy storage device provided in the fourth embodiment is shown below. Figure 6 As shown, exemplarily, this method can be applied to a secondary controller or a data processing module / processor within a secondary controller, and the method includes the following steps:

[0174] S601, Receive a first low-power instruction sent by the primary controller; the first low-power instruction is used to instruct the secondary controller to shut down the second optical transmission module.

[0175] The primary controller and the secondary controller are included in the energy storage device.

[0176] For example, the secondary controller can receive a first low-power command sent by the primary controller through the first optical transmitting module via the second optical receiving module.

[0177] S602. Under the condition of satisfying the second low power control condition, the second optical transmission module of the secondary controller is turned off, so that the primary controller turns off the first light-emitting module connected to the secondary controller.

[0178] In some embodiments, the second low-power control condition may include: the battery device corresponding to the second controller is in a low-voltage state, or the battery device corresponding to the second controller is in a low-voltage state for a duration greater than or equal to a preset low-voltage duration.

[0179] In some embodiments, the method may further include step A: if the secondary controller does not meet the second low-power control condition, continue to control the activation of the second optical transmission module connected to the primary controller in the secondary controller, and send a low-power control failure message to the primary controller. Subsequently, if the secondary controller receives a first low-power command sent again by the primary controller, it executes either S602 or step A.

[0180] S603. If the second low-power control condition is not met, continue to turn on the second optical transmission module of the secondary controller.

[0181] In some embodiments, the secondary controller not meeting the second low-power control condition may include: the battery device corresponding to the secondary controller being in a high-voltage state. For example, the secondary controller not meeting the second low-power control condition may include at least one of the following: the battery device corresponding to the secondary controller being in a high-voltage state; receiving a high-voltage command for the corresponding battery device sent by the primary controller; a cell fault in the corresponding battery device; a communication link fault with the primary controller; a fault in the corresponding high-voltage sampling module; a fault in the power supply module used to supply power to the secondary controller, etc.

[0182] In the technical solution provided in this application embodiment, when the secondary controller meets the second low power control condition, the second optical transmission module connected to the primary controller in the secondary controller is controlled to be turned off. In this way, by controlling the shutdown of the second optical transmission module with high power consumption in the secondary controller, the power consumption of the secondary controller is reduced, thereby reducing the risk of over-discharge of the battery cells in the energy storage device and improving the operational reliability of the energy storage device.

[0183] In some embodiments, the method may further include: disconnecting the power supply path of at least one first power device when the first low-power instruction is further configured to instruct the disconnection of the power supply path of at least one first power device under the secondary controller; the first power device is included in an energy storage device.

[0184] For example, at least one first electrical device that shuts off the power supply path as indicated by the first low-power instruction may be the same as at least one first electrical device that controls the disconnection of the power supply path, or at least one first electrical device that controls the disconnection of the power supply path may belong to at least one first electrical device that shuts off the power supply path as indicated by the first low-power instruction.

[0185] As another example, the first low-power instruction may not indicate the identifier of at least one first power-consuming device, and the second controller may determine the first power-consuming device that needs to have its power supply path disconnected based on pre-configuration information.

[0186] In some embodiments, the method may further include: reducing the power supply power of at least one third power device, wherein the first low-power instruction is further configured to instruct a reduction in the power supply power of at least one third power device under the secondary controller; the third power device is included in an energy storage device.

[0187] For example, the at least one third power device that reduces power supply as indicated by the first low power instruction may be the same as the at least one third power device that controls the reduction of power supply, or the at least one third power device that controls the reduction of power supply may belong to the at least one third power device that reduces power supply as indicated by the first low power instruction.

[0188] As another example, the first low-power instruction may not indicate the identifier of at least one third power device, and the second controller may determine the third power device whose power supply path needs to be disconnected based on the pre-configuration information.

[0189] In some embodiments, the method may further include: entering a low-power mode if the first low-power instruction is also used to instruct the secondary controller to enter a low-power mode.

[0190] In the technical solution provided in this application embodiment, the second controller performs corresponding control according to the instruction of the first low-power command, thereby improving the effectiveness of control.

[0191] In some embodiments, the secondary controller can acquire the remaining high-voltage duration of the energy storage device and the current operating status data of the battery device corresponding to the secondary controller; determine the maximum power supported by the battery device corresponding to the secondary controller based on the remaining high-voltage duration and the current operating status data of the battery device corresponding to the secondary controller; and determine at least one of the following based on the maximum power supported by the battery device corresponding to the secondary controller: at least one first electrical device, at least one third electrical device, and the reduced power supply of each third electrical device.

[0192] For example, when the battery device corresponding to the secondary controller does not supply power to the primary controller, at least one of the following is determined based on the maximum power supported by the battery device corresponding to the secondary controller: at least one first electrical device, at least one third electrical device, and the reduced power supply of each third electrical device. For example, when the battery device corresponding to the secondary controller needs to supply power to the primary controller, a second required power of the secondary controller and the electrical devices under the secondary controller is determined based on the maximum power supported by the battery device corresponding to the secondary controller, the primary controller, and the first required power of the electrical devices under the primary controller; based on the second required power, at least one of the following is determined: at least one first electrical device, at least one third electrical device, and the reduced power supply of each third electrical device.

[0193] In some embodiments, the secondary controller satisfies a second low-power control condition, including at least one of the following:

[0194] When the energy storage device is under high voltage, the corresponding high voltage command for the battery device sent by the primary controller is not received;

[0195] The battery cells in the corresponding battery device are fault-free;

[0196] The communication link with the primary controller is fault-free;

[0197] The corresponding high-voltage sampling module is fault-free;

[0198] The power module used to supply power to the secondary controller is fault-free.

[0199] During implementation, the secondary controller may satisfy some of the above conditions or all of the above conditions to meet the second low-power control conditions.

[0200] In the technical solution provided in this application embodiment, by limiting the secondary controller to meet the second low-power control condition, the low-power control of the secondary controller can be carried out on the basis that the secondary controller meets the set second low-power control condition, thereby improving the reliability of low-power control.

[0201] In some embodiments, a first low-power command is issued by a higher-level control device, and the primary controller determines whether a first low-power control condition is met. If met, the primary controller stops driving the optical transmission module of the transmit (TX) channel while maintaining signal detection of the receive (RX) channel; by shutting down all optical transmission modules of the primary controller, the power consumption of the low-voltage power supply to the primary controller is reduced. Additionally, since the energy storage device is in a low-voltage state, the insulation detection function can be disabled. By stopping the power supply to the insulation detection module under the primary controller and some peripherals unrelated to high voltage, the power supply load is reduced, thus lowering the low-voltage power consumption.

[0202] In some embodiments, the secondary controller receives a first low-power command from the primary controller and determines whether a second low-power control condition is met. If met, the secondary controller stops driving the optical transmission module of the transmit (TX) channel while maintaining signal detection of the receive (RX) channel; by shutting down all optical transmission modules of the secondary controller, the power consumption of low-voltage power supply to the secondary controller is reduced. Additionally, because the energy storage device is in a low-voltage state, the high-voltage detection function of the battery device is not enabled; by stopping the power supply to the high-voltage detection module under the secondary controller and some peripherals unrelated to high voltage, the power supply load is reduced, thus lowering the low-voltage power supply power consumption.

[0203] In some embodiments, by keeping the controller's optical receiver module on, low-power exit commands from external controllers can be received in a timely manner.

[0204] Figure 7 A schematic diagram of the communication architecture of an energy storage device provided in some embodiments, such as Figure 7 As shown, the energy storage device includes a primary controller and N secondary controllers. The primary controller communicates with each secondary controller via a communication module. Figure 7 In the illustrated embodiment, each secondary controller communicates redundantly with the primary controller. Figure 7 In other embodiments, each secondary controller communicates non-redundantly with the primary controller. Figure 7 The illustrated embodiment only allows each communication module to include an optical transmitting module (TX) and an optical receiving module (RX). Exemplarily, the communication module may include an optical communication module.

[0205] Each secondary controller is also connected to a detection device (including a high-voltage detection device) under that secondary controller. The detection device is used to detect the operating status data of the battery device corresponding to each secondary controller and send the detected operating status data to each corresponding secondary controller.

[0206] The primary controller may also include detection equipment (including insulation detection equipment) under the primary controller. The detection equipment is used to detect the operating status data of the energy storage device and send the detected operating status data of the energy storage device to the primary controller.

[0207] The primary controller is also connected to a power controller, which controls the operating power of the energy storage device. The primary controller is also connected to a higher-level control device, enabling the higher-level control device to send commands to the primary controller.

[0208] Figure 8 A schematic diagram of the power supply architecture of an energy storage device provided in some embodiments, such as Figure 8 As shown, the energy storage device includes battery units 1 to N. Each battery unit is connected to a voltage conversion module (e.g., a DC-DC module, such as a 1500V high-voltage DC-DC converter to a 24V low-voltage DC-DC converter, i.e., 1500-24 DC-DC) to enable voltage conversion. Each voltage conversion module is connected to a corresponding secondary controller. Thus, the N battery units are each connected to a corresponding N secondary controllers via their respective voltage conversion modules. Each secondary controller is also connected to a high-voltage sampling module, which acquires the operating status data of the corresponding battery unit and sends this data to the corresponding secondary controller. Each secondary controller is also connected to other electrical devices.

[0209] The voltage conversion module connected to battery device 1 is also connected to the primary controller, so that battery device 1 supplies power not only to secondary controller 1 but also to the primary controller. The primary controller is also connected to an insulation detection module, which detects the insulation status of the energy storage device and sends this status information to the primary controller. The primary controller is also connected to other electrical devices.

[0210] Figure 9 A flowchart illustrating the control method for the energy storage device provided in the fifth embodiment is shown below. Figure 9 As shown, the method includes:

[0211] S901, the primary controller receives the second low-power command sent by the upper-level control device.

[0212] S902. Does the primary controller meet the first low-power control condition?

[0213] The first low-power control condition for the primary controller may include at least one of the following: 1. No high-voltage command is received from the power module or the upper-level control device; 2. A second low-power command is received from the upper-level control device; 3. The system high-voltage state is the low-voltage state; 4. There are no cell-related faults sent by any secondary controller; 5. There are no communication loss faults of the secondary controller; 6. There are no insulation module-related faults; 7. There are no power supply-related faults of the primary controller.

[0214] If the condition is not met, execute S903 and then return to execute S902; if the condition is met, execute S904.

[0215] S903: The primary controller sends the status of the primary controller's low-power control failure and the reason for the low-power control failure to the higher-level control device.

[0216] S904, the primary controller sends the first low-power instruction to the secondary controller.

[0217] Does the S905 secondary controller meet the second low-power control condition?

[0218] The second low-power control condition for the secondary controller may include at least one of the following: 1. No high-voltage command received from the primary controller; 2. Received the first low-power command from the primary controller; 3. The battery device is in a low-voltage state; 4. No cell-related faults; 5. Communication loss fault of the primary controller; 6. No high-voltage sampling module-related faults; 7. No power supply-related faults of the secondary controller.

[0219] If the condition is not met, execute S906 and then return to execute S905; if the condition is met, execute S907.

[0220] S906: The secondary controller sends the status of the secondary controller's low-power control failure and the reason for the low-power control failure to the primary controller.

[0221] After S906, S908 is executed.

[0222] S907, the secondary controller controls the shutdown of the second optical transmission module connected to the primary controller, and controls the disconnection of the power supply path of the high-voltage detection module and some electrical equipment.

[0223] S908, the primary controller determines whether all secondary controllers have successfully implemented low-power control.

[0224] If all secondary controllers successfully implement low-power control, execute S909; if at least one secondary controller fails to implement low-power control, execute S910, and then continue executing S908.

[0225] S909, the primary controller controls the shutdown of the first optical transmission module connected to all secondary controllers, and controls the disconnection of the power supply path of the insulation detection module and some electrical equipment.

[0226] S910: The primary controller sends the status of the secondary controller's low-power control failure and the reason for the low-power control failure to the higher-level control device.

[0227] In some embodiments, the primary controller performs a low-power exit operation and sends a low-power exit command to the secondary controller when at least one of the following conditions is met, so that the secondary controller performs a low-power exit operation: 1. Receiving a high-voltage command sent by the power module or the upper-level control device; 2. Receiving a low-power exit command sent by the upper-level control device.

[0228] Based on the same inventive concept, this application also provides a control device for an energy storage device to implement the control method for the energy storage device described above. The solution provided by this device is similar to the solution described in the above method; therefore, the specific limitations in one or more control device embodiments of the energy storage device provided below can be found in the limitations of the control method for the energy storage device described above, and will not be repeated here.

[0229] In one exemplary embodiment, Figure 10 A schematic diagram of the structure of the control device for an energy storage device provided in some embodiments, such as Figure 10 As shown, the control device 1000 of the energy storage device includes:

[0230] Transmission module 1001 is used to send a first low-power command to each secondary controller in the energy storage device through each of the multiple first optical transmission modules when the first low-power control condition is met; the first low-power command is used to instruct the second optical transmission module of the secondary controller to be turned off.

[0231] The determination module 1002 is used to determine the secondary controller that shuts down the second optical transmission module as the candidate secondary controller;

[0232] Control module 1003 is used to shut down the first optical transmission module connected to the candidate secondary controller among multiple first optical transmission modules.

[0233] In some embodiments, the control module 1003 is further configured to disconnect the power supply path of at least one second electrical device when the first low-power instruction is further configured to instruct the disconnection of the power supply path of at least one first electrical device under the secondary controller; the first electrical device and the second electrical device are included in an energy storage device.

[0234] In some embodiments, the control module 1003 is further configured to reduce the power supply power of at least one fourth electrical device when the first low-power instruction is further configured to instruct the reduction of the power supply power of at least one third electrical device under the secondary controller; the third electrical device and the fourth electrical device are included in an energy storage device.

[0235] In some embodiments, the control module 1003 is further configured to enter a low-power mode when the first low-power instruction is further configured to instruct the secondary controller to enter a low-power mode.

[0236] In some embodiments, the determining module 1002 is further configured to obtain a first number of secondary controllers among the candidate secondary controllers and a second number of secondary controllers among all secondary controllers in the energy storage device; and based on the first number and the second number, determine at least one of the following: at least one second electrical device, at least one fourth electrical device, and the reduced power supply of each fourth electrical device.

[0237] In some embodiments, the determining module 1002 is further configured to acquire the remaining high-voltage duration of the energy storage device and the current operating status data of the target battery device in the energy storage device that supplies power to the primary controller; determine the maximum power supported by the target battery device based on the remaining high-voltage duration and the current operating status data of the target battery device; and determine at least one of the following based on the maximum power supported by the target battery device: at least one second electrical device, at least one fourth electrical device, and the power supply power of each fourth electrical device after the voltage drop.

[0238] In some embodiments, the primary controller satisfies a first low-power control condition, including at least one of the following: when the energy storage device is under high voltage, no high-voltage command is received from the energy storage device; a second low-power command is received, which is used to instruct the first optical transmission module to be turned off; the cells in each battery device in the energy storage device are fault-free; the communication link with each secondary controller is fault-free; there is no insulation fault in the energy storage device; and the power module used to supply power to the primary controller is fault-free.

[0239] In some embodiments, the transmission module 1001 is further configured to receive low-power control failure information sent by a designated secondary controller; the designated secondary controller includes a secondary controller whose second optical transmission module failed to shut down; the determination module 1002 is further configured to determine, based on the low-power control failure information, a target duration between the time when the first low-power instruction is sent to the designated secondary controller next and the current time; the transmission module 1001 is further configured to send the first low-power instruction to the designated secondary controller again at a time interval of the target duration starting from the current time.

[0240] In some embodiments, the control device 1000 of the energy storage device further includes an acquisition module; the acquisition module is used to acquire periodic detection time windows of the candidate secondary controller; the control module 1003 is also used to turn on the first optical transmission module connected to the candidate secondary controller at the beginning of each detection time window, and send a low-power exit command to the candidate secondary controller through the first optical transmission module connected to the candidate secondary controller; the acquisition module is also used to acquire the operating state of the candidate battery device corresponding to the candidate secondary controller in each detection time window; the control module 1003 is also used to control the state of the first optical transmission module connected to the candidate secondary controller according to the operating state of the candidate battery device.

[0241] In some embodiments, the acquisition module includes an acquisition unit and a determination unit. The acquisition unit is used to acquire the operating status data of the candidate battery device recently sent by the candidate secondary controller. The determination unit is used to determine the time interval of each detection time window and the time interval between two adjacent detection time windows based on the operating status data of the candidate battery device. Based on the time interval of each detection time window and the time interval between two adjacent detection time windows, a periodic detection time window is determined.

[0242] In some embodiments, the acquisition module is further configured to receive the operating status data of the candidate battery device sent by the candidate secondary controller within each detection time window when the low-power exit instruction is used to instruct the activation of the second optical transmission module in the secondary controller; and determine the operating status of the candidate battery device based on the operating status data of the candidate battery device.

[0243] In some embodiments, the acquisition module is further configured to, when the low-power exit instruction is used to instruct the candidate secondary controller to provide feedback on battery device operation abnormality indication information, determine that the candidate battery device is in normal operation if no battery device operation abnormality indication information is received within each detection time window; and determine that the target battery device corresponding to the target controller in the candidate secondary controller is in abnormal operation if battery device operation abnormality indication information is received from the target controller in the candidate secondary controller within each detection time window.

[0244] In some embodiments, the control module 1003 is further configured to, when the candidate battery device is in normal operation, shut down the first optical transmission module connected to the candidate secondary controller again at the end of each detection time window; when the target battery device in the candidate battery device is in abnormal operation, starting from the end of each detection time window, keep the target optical transmission module in the first optical transmission module connected to the candidate secondary controller on, and shut down the optical transmission modules other than the target optical transmission module in the first optical transmission module connected to the candidate secondary controller again; the target optical transmission module corresponds to the target battery device.

[0245] In one exemplary embodiment, Figure 11 A schematic diagram of the control device for an energy storage device provided in other embodiments, such as Figure 11 As shown, the control device 1100 of the energy storage device includes:

[0246] Transmission module 1101 is used to receive a first low-power command sent by the primary controller; the first low-power command is used to instruct the secondary controller to shut down the second optical transmission module; the primary controller and the secondary controller are included in the energy storage device;

[0247] The control module 1102 is used to turn off the second optical transmission module of the secondary controller when the second low-power control condition is met, so that the primary controller turns off the first light-emitting module connected to the secondary controller; and to continue to turn on the second optical transmission module of the secondary controller when the second low-power control condition is not met.

[0248] In some embodiments, the control module 1102 is further configured to disconnect the power supply path of at least one first electrical device when the first low-power instruction is further configured to instruct the disconnection of the power supply path of at least one first electrical device under the secondary controller; the first electrical device is included in an energy storage device.

[0249] In some embodiments, the control module 1102 is further configured to reduce the power supply power of at least one third electrical device when the first low-power instruction is further configured to instruct the reduction of the power supply power of at least one third electrical device under the secondary controller; the third electrical device is included in an energy storage device.

[0250] In some embodiments, the control module 1102 is further configured to enter a low-power mode when the first low-power instruction is further configured to instruct the secondary controller to enter a low-power mode.

[0251] In some embodiments, the secondary controller satisfies a second low-power control condition, including at least one of the following: when the energy storage device is under high voltage, it does not receive a high-voltage command sent by the primary controller for the corresponding battery device; the cells in the corresponding battery device are fault-free; the communication link with the primary controller is fault-free; the corresponding high-voltage sampling module is fault-free; and the power supply module for supplying power to the secondary controller is fault-free.

[0252] The descriptions of the above device embodiments are similar to those of the above method embodiments, and have similar beneficial effects. For technical details not disclosed in the device embodiments of this application, please refer to the descriptions of the method embodiments of this application for understanding.

[0253] Each module in the control device of the aforementioned energy storage device can be implemented entirely or partially through software, hardware, or a combination thereof. These modules can be embedded in the processor of the control device in hardware form or independent of it, or stored in the memory of the control device in software form, so that the processor can call and execute the operations corresponding to each module.

[0254] Figure 12 A schematic diagram of the energy storage device provided in the second embodiment is shown below. Figure 12 As shown, the energy storage device includes a primary controller and multiple secondary controllers (e.g., Figure 12 The N secondary controllers shown are N, where N is an integer greater than or equal to 2. The primary controller is used to send a first low-power command to each secondary controller in the energy storage device through each of the multiple first optical transmission modules when the first low-power control condition is met. The first low-power command is used to instruct the secondary controller to shut down the second optical transmission module. The primary controller is also used to determine the secondary controller whose second optical transmission module is shut down as the candidate secondary controller. The primary controller is also used to shut down the first optical transmission module connected to the candidate secondary controller among the multiple first optical transmission modules.

[0255] Figure 13 Schematic diagrams of the energy storage system provided for some embodiments, such as Figure 13 As shown, the energy storage system includes a power conversion device and an energy storage device as described in any of the above embodiments, with the power conversion device connected between the power generation device and the energy storage device.

[0256] In one exemplary embodiment, Figure 14This is a schematic diagram of a control device provided for some embodiments. The control device may include a first controller or a second controller as described in any of the above embodiments. The control device includes a processor, a memory, an input / output interface, a communication interface, a display unit, and an input device. The processor, memory, and input / output interface are connected via a system bus, and the communication interface, display unit, and input device are also connected to the system bus via the input / output interface. The processor of the control device provides computing and control capabilities. The memory of the control 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 input / output interface of the control device is used for exchanging information between the processor and external devices. The communication interface of the control device is used for wired or wireless communication with external terminals. Wireless communication can be implemented through Wireless Fidelity (WIFI), mobile cellular networks, Near Field Communication (NFC), or other technologies. When the computer program is executed by the processor, it implements a control method for an energy storage device. The display unit of the control device is used to form a visually visible image and can be a display screen, a projection device, or a virtual reality imaging device. The display screen can be an LCD screen or an e-ink screen. The input device of the control device can be a touch layer covering the display screen, or buttons, a trackball, or a touchpad set on the casing of the control device, or an external keyboard, touchpad, or mouse, etc.

[0257] Those skilled in the art will understand that Figure 14 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 control device to which the present application is applied. The specific control device may include more or fewer components than those shown in the figure, or combine certain components, or have different component arrangements.

[0258] For example, the control device includes a memory and a processor, the memory storing a computer program, and the processor executing the computer program to implement the steps of the method of any of the above embodiments.

[0259] In one embodiment, a computer-readable storage medium is provided, wherein a computer program, when executed by a processor, implements the steps of the method provided in any of the above embodiments.

[0260] In one embodiment, a computer program product is provided, including a computer program that, when executed by a processor, implements the steps of the method provided in any of the above embodiments.

[0261] 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. When the computer program is executed, it can include the processes of the embodiments of the methods described above.

[0262] The processor, functional modules, or functional units in any embodiment of this application may include an integration of one or more of the following: a general-purpose processor, an application-specific integrated circuit (ASIC), a digital signal processor (DSP), a digital signal processing device (DSPD), a programmable logic device (PLD), a field-programmable gate array (FPGA), a central processing unit (CPU), a graphics processing unit (GPU), an embedded neural network processing unit (NPU), a controller, a microcontroller, a microprocessor, a programmable logic device, a discrete gate or transistor logic device, a discrete hardware component, a quantum computing-based data processing logic unit, an artificial intelligence (AI) processor, etc. The general-purpose processor may be a microprocessor or any conventional processor.

[0263] The memory or computer-readable storage medium in any embodiment of this application may include at least one of non-volatile memory and volatile memory. Non-volatile memory includes integration of one or more of the following: Read Only Memory (ROM), Programmable Read-Only Memory (PROM), Erasable Programmable Read-Only Memory (EPROM), Electrically Erasable Programmable Read-Only Memory (EEPROM), Ferromagnetic Random Access Memory (FRAM), Flash Memory, Magnetic Surface Memory, Optical Disc, Compact Disc Read-Only Memory (CD-ROM), Magnetic Tape, Floppy Disk, Flash Memory, Optical Memory, High-Density Embedded Non-Volatile Memory, Resistive Random Access Memory (ReRAM), Magnetoresistive Random Access Memory (MRAM), Ferroelectric Random Access Memory (FRAM), Phase Change Memory (PCM), Graphene Memory, Volatile Memory, etc. Volatile memory includes one or more of the following: Random Access Memory (RAM) or external cache memory. 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).

[0264] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this application.

[0265] The above embodiments are merely illustrative of several implementation methods of this application, and their descriptions are relatively specific and detailed. However, they should not be construed as limiting the scope of this application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. A control method of an energy storage device, characterized by, The method comprises: In the case that a first low-power consumption control condition is met, sending a first low-power consumption instruction to each secondary controller in the energy storage device through each first light sending module of a plurality of first light sending modules; the first low-power consumption instruction is used to instruct to close the second light sending module of the secondary controller; Determine the secondary controller with the closed second light sending module as a standby secondary controller; Close the first light sending module connected with the standby secondary controller in the plurality of first light sending modules; The method further comprises at least one of the following: In the case that the first low-power consumption instruction is also used to instruct to disconnect the power supply path of at least one first power consumption device under the secondary controller, disconnect the power supply path of at least one second power consumption device; the first power consumption device and the second power consumption device are included in the energy storage device; In the case that the first low-power consumption instruction is also used to instruct to reduce the power supply power of at least one third power consumption device under the secondary controller, reduce the power supply power of at least one fourth power consumption device; the third power consumption device and the fourth power consumption device are included in the energy storage device; In the case that the first low-power consumption instruction is also used to instruct the secondary controller to enter a low-power consumption mode, enter a low-power consumption mode.

2. The method of claim 1, wherein, The method further comprises: In the case of closing the first light sending module connected with the standby secondary controller in the plurality of first light sending modules, close the first light receiving module connected with the standby secondary controller in a plurality of first light receiving modules.

3. The method of claim 1, wherein, The method further comprises: Obtain the first number of secondary controllers in the standby secondary controller and the second number of secondary controllers in all secondary controllers in the energy storage device; According to the first number and the second number, determine at least one of the following: the at least one second power consumption device, the at least one fourth power consumption device, the power supply power of each fourth power consumption device after falling.

4. The method of claim 1, wherein, The method further comprises: Obtain the remaining high-voltage duration of the energy storage device and the current running state data of the target battery device in the energy storage device which supplies power to the primary controller; According to the remaining high-voltage duration and the current running state data of the target battery device, determine the maximum power supported by the target battery device; According to the maximum power supported by the target battery device, determine at least one of the following: the at least one second power consumption device, the at least one fourth power consumption device, the power supply power of each fourth power consumption device after falling.

5. The method according to any one of claims 1 to 4, characterized in that, The first low-power consumption control condition is met, including at least one of the following: In the case that the energy storage device is under high voltage, no high-voltage instruction of the energy storage device is obtained; A second low-power consumption instruction is obtained, which is used to instruct to close the first light sending module; The battery cell in each battery device in the energy storage device is fault-free; The communication link between the each secondary controller is fault-free; The energy storage device has no insulation fault; The power supply module for supplying power to the primary controller is fault-free.

6. The method according to any one of claims 1 to 4, characterized in that, The method further comprises: receive low-power control failure information sent by a specified secondary controller; the specified secondary controller includes a secondary controller in which the second optical sending module fails to be closed; determine a target time length between a time when the first low-power instruction is next sent to the specified secondary controller and a current time according to the low-power control failure information; at a time that is the target time length away from the current time, send the first low-power instruction to the specified secondary controller again.

7. The method according to any one of claims 1 to 4, characterized in that, The method further comprises: acquire periodic detection time windows of the candidate secondary controller; at a start time of each detection time window, turn on a first optical sending module connected to the candidate secondary controller, and send a low-power exit instruction to the candidate secondary controller through the first optical sending module connected to the candidate secondary controller; acquire a working state of a candidate battery device corresponding to the candidate secondary controller in each detection time window; control a state of the first optical sending module connected to the candidate secondary controller according to the working state of the candidate battery device.

8. The method of claim 7, wherein, The acquisition of the periodic detection time windows of the candidate secondary controller comprises: acquire running state data of the candidate battery device sent by the candidate secondary controller most recently; determine a time interval of each detection time window and a time interval of adjacent two detection time windows according to the running state data of the candidate battery device; determine the periodic detection time windows according to the time interval of each detection time window and the time interval of adjacent two detection time windows.

9. The method of claim 7, wherein, The acquisition of the working state of the candidate battery device corresponding to the candidate secondary controller in each detection time window comprises one of the following: in a case where the low-power exit instruction is used to instruct to turn on a second optical sending module in the secondary controller, receive running state data of the candidate battery device sent by the candidate secondary controller in each detection time window; and determine the working state of the candidate battery device according to the running state data of the candidate battery device; in a case where the low-power exit instruction is used to instruct the candidate secondary controller to feed back battery device running abnormality indication information, if the battery device running abnormality indication information is not received in each detection time window, it is determined that the candidate battery device is in a normal running state; if the battery device running abnormality indication information fed back by a target controller in the candidate secondary controller is received in each detection time window, it is determined that a target battery device corresponding to the target controller is in an abnormal running state.

10. The method of claim 7, wherein, The control of the state of the first optical sending module connected to the candidate secondary controller according to the working state of the candidate battery device comprises: in a case where the candidate battery device is in a normal running state, turn off the first optical sending module connected to the candidate secondary controller again at an end time of each detection time window. In the case that the target battery device in the candidate battery device is in an abnormal operation state, starting the target optical transmitting module in the first optical transmitting module connected with the candidate secondary controller from the end time of each detection time window, and closing the optical transmitting module other than the target optical transmitting module in the first optical transmitting module connected with the candidate secondary controller again; the target optical transmitting module corresponds to the target battery device.

11. A control method of an energy storage device, characterized by, The method comprises: receiving a first low-power consumption instruction sent by a primary controller; the first low-power consumption instruction is used to instruct to close a second optical transmitting module of a secondary controller; the primary controller and the secondary controller are included in the energy storage device; in the case that a second low-power consumption control condition is met, closing the second optical transmitting module of the secondary controller to make the primary controller close a first light-emitting module connected with the secondary controller; in the case that the second low-power consumption control condition is not met, continuing to start the second optical transmitting module of the secondary controller; The method further comprises at least one of the following: in the case that the first low-power consumption instruction is also used to instruct to disconnect the power supply path of at least one first power-consuming equipment under the secondary controller, disconnecting the power supply path of the at least one first power-consuming equipment; the first power-consuming equipment is included in the energy storage device; in the case that the first low-power consumption instruction is also used to instruct to reduce the power supply power of at least one third power-consuming equipment under the secondary controller, reducing the power supply power of the at least one third power-consuming equipment; the third power-consuming equipment is included in the energy storage device; in the case that the first low-power consumption instruction is also used to instruct the secondary controller to enter a low-power consumption mode, entering the low-power consumption mode.

12. The method of claim 11, wherein, The method further comprises: continuously starting a second optical receiving module.

13. The method according to claim 11 or 12, characterized in that, The second low-power consumption control condition is met, comprising at least one of the following: in the case that the energy storage device is under high voltage, no high-voltage instruction corresponding to the battery device sent by the primary controller is acquired; there is no fault in the battery cell in the corresponding battery device; the communication link between the primary controller and the secondary controller is fault-free; the corresponding high-voltage sampling module is fault-free; the power supply module for supplying power to the secondary controller is fault-free.

14. A control device for an energy storage device, characterized by The device comprises: a transmission module, configured to send a first low-power consumption instruction to each secondary controller in the energy storage device through each first optical transmitting module of a plurality of first optical transmitting modules in the case that a first low-power consumption control condition is met; the first low-power consumption instruction is used to instruct to close a second optical transmitting module of the secondary controller; a determination module, configured to determine the secondary controller whose second optical transmitting module is closed as a candidate secondary controller; a control module, configured to close a first optical transmitting module connected with the candidate secondary controller in the plurality of first optical transmitting modules; The control module is further configured to at least one of the following: in the case that the first low-power consumption instruction is further used for instructing to disconnect the power supply path of at least one first power-consuming device under the secondary controller, disconnect the power supply path of at least one second power-consuming device; the first power-consuming device and the second power-consuming device are included in the energy storage device; in the case that the first low-power consumption instruction is further used for instructing to reduce the power supply power of at least one third power-consuming device under the secondary controller, reduce the power supply power of at least one fourth power-consuming device; the third power-consuming device and the fourth power-consuming device are included in the energy storage device; in the case that the first low-power consumption instruction is further used for instructing the secondary controller to enter a low-power consumption mode, enter the low-power consumption mode.

15. A control device for an energy storage device, characterized by The device comprises: a transmission module, configured to receive a first low-power consumption instruction sent by a primary controller; the first low-power consumption instruction is used for instructing to turn off a second light transmission module of a secondary controller; the primary controller and the secondary controller are included in the energy storage device; a control module, configured to turn off the second light transmission module of the secondary controller in the case that a second low-power consumption control condition is met, so that the primary controller turns off a first light-emitting module connected with the secondary controller; continue to turn on the second light transmission module of the secondary controller in the case that the second low-power consumption control condition is not met; the control module is further configured to at least one of: in the case that the first low-power consumption instruction is further used for instructing to disconnect the power supply path of at least one first power-consuming device under the secondary controller, disconnect the power supply path of the at least one first power-consuming device; the first power-consuming device is included in the energy storage device; in the case that the first low-power consumption instruction is further used for instructing to reduce the power supply power of at least one third power-consuming device under the secondary controller, reduce the power supply power of the at least one third power-consuming device; the third power-consuming device is included in the energy storage device; in the case that the first low-power consumption instruction is further used for instructing the secondary controller to enter a low-power consumption mode, enter the low-power consumption mode.

16. An energy storage device, characterized by The energy storage device comprises a primary controller and a plurality of secondary controllers; the primary controller is configured to send a first low-power consumption instruction to each of the secondary controllers in the energy storage device through each of a plurality of first light transmission modules in the case that a first low-power consumption control condition is met; the first low-power consumption instruction is used for instructing to turn off a second light transmission module of the secondary controller; the primary controller is further configured to determine the secondary controller whose second light transmission module is turned off as a standby secondary controller; the primary controller is further configured to turn off a first light transmission module connected with the standby secondary controller in the plurality of first light transmission modules; the primary controller is further configured to at least one of: in the case that the first low-power consumption instruction is further used for instructing to disconnect the power supply path of at least one first power-consuming device under the secondary controller, disconnect the power supply path of at least one second power-consuming device; the first power-consuming device and the second power-consuming device are included in the energy storage device; in the case that the first low-power instruction is further used for instructing to reduce the power supply of at least one third power-consuming device under the secondary controller, reduce the power supply of at least one fourth power-consuming device; the third power-consuming device and the fourth power-consuming device are included in the energy storage device; in the case that the first low-power instruction is further used for instructing the secondary controller to enter a low-power mode, enter a low-power mode.

17. An energy storage system characterized by, comprise a power conversion device connected between a power generation device and the energy storage device.

18. A control device characterized by comprising: comprise a memory storing a computer program and a processor, wherein the processor implements the steps of the method in any one of claims 1 to 10 or any one of claims 11 to 13 when executing the computer program.

19. 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 any one of claims 1 to 10 or any one of claims 11 to 13.

20. A computer program product, characterised in that, comprise a computer program, wherein the computer program is executed by the processor to implement the steps of the method in any one of claims 1 to 10 or any one of claims 11 to 13.

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