Energy-saving method of energy storage equipment, energy storage equipment and energy storage system

Abstract

The embodiment of the invention relates to the technical field of energy storage, and discloses an energy-saving method of energy storage equipment, the energy storage equipment comprises a battery pack and a power module, and the method comprises the following steps: acquiring an equipment state, a first duration and a second duration of the energy storage equipment; controlling the energy storage device to enter a first dormant state or a second dormant state based on the device state and the first duration so as to reduce the energy consumption of the energy storage device; or, controlling the energy storage equipment to enter a third dormant state based on the equipment state and a second duration, so as to reduce the energy consumption of the energy storage equipment, wherein the energy consumption of the energy storage equipment in the first dormant state, the second dormant state and the third dormant state is gradually reduced in sequence. According to the method, the energy storage equipment is controlled to enter different dormancy states in combination with the equipment state, the first duration and the second duration of the energy storage equipment, so that the energy storage equipment is more intelligent in the aspects of dormancy, energy conservation and consumption reduction, dormancy schemes can be flexibly configured through various ways according to different working conditions, and the working efficiency is improved. And the risk of over-discharge of the battery caused by long-time standby can be reduced.

Description

An energy-saving method for energy storage devices, an energy storage device, and an energy storage system. Technical Field

[0001] This application relates to the field of energy storage technology, and in particular to an energy-saving method, energy storage device, and energy storage system for energy storage devices. Background Technology

[0002] With the continuous development of technology, energy storage devices have a wide range of applications in daily life. During operation, energy storage devices are not in a constant charging and discharging state. When not receiving power dispatch commands, the energy storage device is in a dormant state. However, in this state, the energy storage device still needs to maintain a rapid response state to quickly respond to power dispatch commands. To maintain the basic operational status of the energy storage device in this state, each module remains powered on, which consumes a significant amount of electrical energy and affects the overall efficiency of the energy storage device.

[0003] Existing methods typically avoid energy loss caused by maintaining basic operational status by controlling the energy storage device to enter a deep sleep state after power-off. However, if there is a power response requirement at this time, the energy storage device needs to go through the power-on process again, which takes a long time and cannot respond to power in a timely manner. Summary of the Invention

[0004] The embodiments of this application mainly provide an energy-saving method for energy storage devices, which can reduce the energy loss of energy storage devices in non-working states while confirming the response speed of the energy storage devices.

[0005] To solve the above-mentioned technical problems, the embodiments of this application adopt the following technical solutions: In a first aspect, the embodiments of this application provide an energy-saving method for an energy storage device, the energy storage device including: a battery pack and a power module, the method including: acquiring the device status of the energy storage device, a first duration and a second duration; controlling the energy storage device to enter a first hibernation state or a second hibernation state based on the device status and the first duration, so as to reduce the energy consumption of the energy storage device; or, controlling the energy storage device to enter a third hibernation state based on the device status and the second duration, so as to reduce the energy consumption of the energy storage device; wherein, the energy consumption of the energy storage device decreases sequentially in the first hibernation state, the second hibernation state and the third hibernation state.

[0006] In some embodiments, the device state includes an operating state. Controlling the energy storage device to enter a first hibernation state or a second hibernation state based on the device state and a first duration includes: if the device state of the energy storage device is an operating state, determining whether the first duration is greater than a second time threshold; if so, controlling the energy storage device to enter a second hibernation state.

[0007] In some embodiments, controlling the energy storage device to enter a first hibernation state or a second hibernation state based on the device status and a first duration further includes: if the device status of the energy storage device is an operating state, determining whether the first duration is greater than a first time threshold; if so, controlling the energy storage device to enter the first hibernation state.

[0008] In some embodiments, controlling the energy storage device to enter a third sleep state based on the device status and a second duration includes: if the device status of the energy storage device is the second sleep state, determining whether the second duration is greater than a third time threshold; if so, controlling the energy storage device to enter the third sleep state.

[0009] In some embodiments, before determining whether the first duration is greater than the first time threshold, the method further includes: obtaining the scheduling power of the energy storage device; determining whether the energy storage device is in an idle state based on the scheduling power; if the energy storage device is in an idle state, controlling the energy storage device to enter a first hibernation state based on the first duration and the first time threshold.

[0010] In some embodiments, before determining whether the second duration is greater than the third time threshold, the method further includes: responding to a control signal sent by an external control device, controlling the power module to enter the power-on state, so as to adjust the device state of the energy storage device to the operating state.

[0011] In some embodiments, the device status includes a fault status; if the device status of the energy storage device is a fault status, the power module is controlled to enter a shutdown state, and the battery pack is controlled to power down.

[0012] Secondly, embodiments of this application provide an energy storage device, including: a battery pack, a control module, and a power module; the control module is communicatively connected to the power module and the battery pack respectively, and is configured to collect electrical signal data of the battery pack and send control signals to the power module and the battery pack according to the electrical signal data to control the energy consumption of the energy storage device; and the control module is further configured to perform the method provided in any of the first aspects.

[0013] In some embodiments, the battery pack includes a battery cell, a battery management module, and a battery control module; wherein the battery cell is electrically connected to one end of the battery management module and one end of the battery control module, and the other end of the battery management module is communicatively connected to the other end of the battery control module; the battery management module is configured to acquire electrical signal parameters of the battery cell in real time and transmit the electrical signal parameters to the battery control module; the battery control module is configured to send the electrical signal parameters to the control module and control the battery control module to adjust the power supply to the battery cell based on the control signals transmitted by the control module.

[0014] Thirdly, embodiments of this application provide an energy storage system, including: an external control device, and an energy storage device as provided in the second aspect.

[0015] The beneficial effects of this application's embodiments are as follows: Unlike existing technologies, this application provides an energy-saving method for an energy storage device. The energy storage device includes a battery pack and a power module. The method includes: acquiring the device status, a first duration, and a second duration of the energy storage device; controlling the energy storage device to enter a first sleep state or a second sleep state based on the device status and the first duration to reduce energy consumption; or, controlling the energy storage device to enter a third sleep state based on the device status and the second duration to reduce energy consumption; wherein the energy consumption of the energy storage device decreases sequentially in the first sleep state, the second sleep state, and the third sleep state. This method combines the device status, the first duration, and the second duration of the energy storage device to control it into different sleep states, making the energy storage device more intelligent in terms of sleep and energy saving. It can flexibly configure sleep schemes through various means according to different operating conditions and can reduce the risk of battery over-discharge caused by prolonged standby. Attached Figure Description

[0016] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0017] Figure 1 is a structural schematic diagram of an energy storage device provided in an embodiment of this application; Figure 2 is a flowchart of an energy-saving method for an energy storage device provided in an embodiment of this application; Figure 3 is a detailed flowchart of an energy-saving method for an energy storage device provided in an embodiment of this application; Figure 4 is a partial structural schematic diagram of an energy storage device provided in an embodiment of this application; Figure 5 is a structural schematic diagram of an energy storage system provided in an embodiment of this application. Detailed Implementation

[0018] The present application will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present application, but do not limit the present application in any way. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present application. These all fall within the protection scope of the present application.

[0019] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0020] It should be noted that, unless there is a conflict, the various features in the embodiments of this application can be combined with each other, all of which are within the protection scope of this application. Furthermore, although functional modules are divided in the device schematic diagram and a logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in a different order than the module division in the device or the order in the flowchart. In addition, the terms "first," "second," and "third" used herein do not limit the data or execution order, but only distinguish identical or similar items with essentially the same function and effect.

[0021] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of this application. The term "and / or" as used in this specification includes any and all combinations of one or more of the associated listed items.

[0022] Furthermore, the technical features involved in the various embodiments of this application described below can be combined with each other as long as they do not conflict with each other.

[0023] With the continuous development of technology, energy storage devices have a wide range of applications in daily life. During operation, energy storage devices are not in a constant charging and discharging state. When not receiving power dispatch commands, the energy storage device is in a dormant state. However, in this state, the energy storage device still needs to maintain a rapid response state to quickly respond to power dispatch commands. To maintain the basic operational status of the energy storage device in this state, each module remains powered on, which consumes a significant amount of electrical energy and affects the overall efficiency of the energy storage device.

[0024] Existing methods typically avoid energy loss caused by maintaining basic operational status by controlling the energy storage device to enter a deep sleep state after power-off. However, if there is a power response requirement at this time, the energy storage device needs to go through the power-on process again, which takes a long time and cannot respond to power in a timely manner.

[0025] In summary, existing energy storage device hibernation schemes lack intelligence and struggle to achieve a balance between hibernation and rapid power response. Based on this, this solution does indeed provide an energy-saving method for energy storage devices, reducing standby power consumption while mitigating the risk of battery over-discharge due to prolonged standby, provided that the energy storage device can respond quickly to power scheduling.

[0026] In view of this, this application provides an energy-saving method S100 for an energy storage device. As shown in FIG1, the energy storage device includes a battery pack, a power module, and a control module. The battery pack includes multiple batteries for storing or providing electrical energy. The power module is used to control the output or input power of the energy storage device, and the control module is used to control the input and output of the power module and the battery pack. As shown in FIG2, the method S100 includes: S10: acquiring the device status of the energy storage device, a first duration, and a second duration.

[0027] It is understandable that energy storage devices exist in various states during actual use, such as charging, discharging, or dormant states. Different states of energy storage devices represent their current working state. For example, if the energy storage device is in a discharging state, it means that the energy storage device is currently in a working state, that is, providing power to external devices. If the energy storage device is in a dormant or standby state, it means that the energy storage device is currently in a non-working state, that is, the energy storage device does not need to supply power to external devices, nor does it need to be charged for power recovery.

[0028] As can be seen from the foregoing, when an energy storage device is in a non-working state, it neither discharges to provide power to external devices nor recharges to restore its own energy reserves. In other words, when the energy storage device is in a non-working state, the corresponding charging and discharging power, which characterizes the output power of the energy storage device, is 0. At this time, the energy storage device is in an unloaded state. The duration of the energy storage device in an unloaded state is the unloaded duration of the energy storage device. In other words, the duration of the energy storage device's charging and discharging power being 0 is the unloaded duration of the energy storage device. The unloaded duration characterizes the duration of the energy storage device's non-working state. The aforementioned first duration is the unloaded duration.

[0029] Based on this, by combining the current equipment status of the energy storage device with the idle time of the energy storage device (first duration), the current working status of the energy storage device can be accurately judged, which facilitates subsequent judgment and control of the energy storage device's hibernation scheme, so as to reasonably reduce the energy loss of the energy storage device during hibernation.

[0030] S20: Based on the device status and the first duration, control the energy storage device to enter the first hibernation state or the second hibernation state to reduce the energy consumption of the energy storage device.

[0031] It is understandable that energy storage devices enter a sleep state to reduce energy loss when not in operation. In this embodiment, to balance low energy consumption and rapid power command response in the sleep state, three different sleep states are set: a first sleep state, a second sleep state, and a third sleep state. The energy consumption of the energy storage device differs in the first, second, and third sleep states. That is, the energy storage device controls the power-on and power-off status of each module according to the corresponding sleep state, thereby controlling the energy consumption of the energy storage device in the sleep state.

[0032] In this embodiment, if the energy storage device is in a first sleep state, the energy storage converter (PCS) in the power module of the energy storage device blocks the PWM pulse, that is, it shuts down all power devices, so that there is no energy exchange between the battery pack of the energy storage device and the load, reducing the standby power consumption of the energy storage device. At the same time, by blocking the PWM pulse, the energy storage device puts the power module into a sleep state, so that the power module will only switch to the working state after receiving a sleep exit or power command, avoiding false start-ups of the power module caused by grid voltage fluctuations, battery polarization rebound, or EMS false pulses. In this case, the energy storage device can reduce the energy loss of the power module, and can also respond quickly to power requests, which is suitable for scenarios that need to frequently enter sleep mode in a short period of time.

[0033] In this embodiment, if the energy storage device is in a second sleep state, it sends a shutdown command to the energy storage converter in the power module, thereby turning off the AC / DC relays on the energy storage converter side. The main positive and main auxiliary relays on the battery pack side remain closed, further reducing power loss on the AC side of the energy storage converter compared to the first sleep state. In this case, when responding to a power command, the energy storage device needs to first send a power-on command to the energy storage converter in the power module to control its power-on before it can respond to the received power command. In some embodiments, the second sleep state is a sleep state.

[0034] Because the energy storage device in the second sleep state directly controls the power module's energy storage converter to shut down, the power module's energy consumption in the second sleep state is lower than that in the first sleep state. However, when faced with a power command, the energy storage device in the second sleep state needs to first control the energy storage converter in the power module to turn on before responding to the power command. Therefore, the response time of the energy storage device in the second sleep state to a power command is longer than that of the energy storage device in the first sleep state. Based on this, the second sleep state is suitable for scenarios where the energy storage device has a long idle time and the power response time requirement is not high.

[0035] By setting different hibernation schemes, energy storage devices can select the appropriate hibernation state based on their own operating status and idle time when facing different usage scenarios. This allows the energy storage devices to reduce their own hibernation energy consumption while ensuring a rapid response to power commands.

[0036] In some embodiments, the aforementioned step S20 specifically includes: S21: If the device state of the energy storage device is the operating state, determine whether the first duration is greater than the second time threshold; if so, control the energy storage device to enter the second hibernation state.

[0037] As can be seen from the above, the device status of an energy storage device represents the working status of the energy storage device in the current scenario. When the device status of the energy storage device is in the running state, that is, when the energy storage device is in the working state or standby state, it means that all modules of the energy storage device are in a normal working state, that is, there is no module abnormality or device shutdown in the module. At this time, the energy storage device may be charging and discharging, or the energy storage device is not charging and discharging but is not in a dormant state either.

[0038] Therefore, when controlling an energy storage device to enter a second sleep state, it is first necessary to determine the state of the energy storage device, that is, to confirm whether the energy storage device can enter the second sleep state. In other words, the energy storage device determines whether the first time period is greater than the second time threshold. Here, the first time period is the idle time of the energy storage device, that is, the time during which the input and output power of the energy storage device is 0. During the first time period, the energy storage device does not respond to power commands. Therefore, the first time period can be used to determine whether the current scenario requires the energy storage device to frequently respond to power commands.

[0039] The second time threshold is used to determine whether the conditions for the energy storage device to enter the second sleep state have been met in the first time. It is set by the operator based on the actual application scenario. For example, if the interval between power commands issued to the energy storage device is long, and the device needs to respond frequently to these commands, the second time threshold is set to a longer duration. This prevents the energy storage device from entering the second sleep state within the interval between power commands and then needing to respond to commands again, thus avoiding frequent power module power-on / off cycles. In this case, if the first time duration exceeds the second time threshold, the energy storage device enters the second sleep state. The device sends a shutdown command to the energy storage converter in the power module, thereby turning off the AC / DC relays on the energy storage converter side and keeping the main positive and main auxiliary relays on the battery pack side closed, reducing the standby power consumption of the energy storage device.

[0040] Based on the current status of the energy storage device, the device is controlled to enter a second sleep state by combining a first duration and a preset second time threshold. This allows for the selection of a sleep state that is appropriate for the current usage scenario of the energy storage device, thereby balancing energy saving and power command response.

[0041] S22: If the energy storage device is in the running state, determine whether the first duration is greater than the first time threshold; if so, control the energy storage device to enter the first hibernation state.

[0042] As can be seen from the above, the device status of an energy storage device represents the working status of the energy storage device in the current scenario. When the device status of the energy storage device is in the running state, that is, when the energy storage device is in the working state or standby state, it means that all modules of the energy storage device are in a normal working state, that is, there is no module abnormality or device shutdown in the module. At this time, the energy storage device may be charging and discharging, or the energy storage device is not charging and discharging but is not in a dormant state either.

[0043] Therefore, when controlling an energy storage device to enter the first sleep state, it is first necessary to determine the state of the energy storage device, that is, to confirm whether the energy storage device can enter the first sleep state. In other words, the energy storage device determines whether the first duration is greater than the first time threshold. Here, the first duration is the idle time of the energy storage device, that is, the duration during which the input and output power (charging and discharging power) of the energy storage device is 0. During the first duration, the energy storage device does not perform any power input or output. Therefore, the first duration can be used to determine whether the current scenario requires the energy storage device to frequently respond to power commands.

[0044] The first time threshold is used to determine whether the conditions for the energy storage device to enter the first sleep state have been met at the first time. It is set by the operator based on the actual application scenario. For example, if the interval between power commands issued to the energy storage device is short, the first time threshold is set to a shorter time, allowing the energy storage device to successfully enter the first sleep state within the power command interval, thereby reducing energy consumption during this interval. In this case, if the first duration exceeds the first time threshold, the energy storage device enters the first sleep state, and the energy storage converter in the control power module blocks the PWM pulse, i.e., shuts down all power devices, preventing energy exchange between the energy storage device's battery pack and the load, thus reducing the standby power consumption of the energy storage device.

[0045] Based on the current status of the energy storage device, and combined with the first duration and the preset first time threshold, the energy storage device is controlled to enter the first sleep state. This allows for the selection of a sleep state that is appropriate for the current usage scenario of the energy storage device, thereby balancing energy saving and power command response.

[0046] S30: Based on the device status and the second duration, control the energy storage device to enter the third sleep state to reduce the energy consumption of the energy storage device.

[0047] The second duration is the duration during which the energy storage device is in the second sleep state. As mentioned above, if the energy storage device does not respond to power commands for a long time, it will enter the second sleep mode. If the duration of the second sleep state is long, it means that the energy storage device has not received and responded to power commands for a long time. At this time, the energy consumption of the energy storage device in the non-working state can be further reduced by controlling the energy storage device to enter the third sleep state.

[0048] Since the energy storage device enters the third sleep state from the second sleep state, upon entering the third sleep state, after shutting down the energy storage inverter in the power module, the energy storage device sends a power-down command to the battery management module in the battery pack, disconnecting the main positive and auxiliary relays on the DC side and the auxiliary relay on the DC side. At this time, the energy storage device only maintains power supply to necessary modules such as the control module, dynamic environment control system, and liquid cooling unit, significantly reducing energy consumption in the non-operating state. In this scenario, if the energy storage device receives a power command and needs to respond, it needs to control not only the energy storage inverter to start but also the battery pack to power on. Therefore, the response time of the energy storage device to the power command in the third sleep state is longer than that in the second sleep state. Thus, the third sleep state is only suitable for scenarios where the energy storage device has no power dispatch for an extended period (more than one day) and can accept an initial power response time of more than 30 seconds. In some embodiments, the third sleep state is a shutdown state.

[0049] By setting different hibernation schemes for different hibernation states, energy storage devices can enter a third hibernation state when facing different usage scenarios, based on their own operating status and second duration. This allows the energy storage devices to reasonably reduce energy consumption in the hibernation state according to the usage scenario.

[0050] In some embodiments, the aforementioned step S30 specifically includes: S31: if the device state of the energy storage device is a second hibernation state, determine whether the second duration is greater than a third time threshold; if so, control the energy storage device to enter a third hibernation state.

[0051] As can be seen from the above, the device status of an energy storage device represents the working status of the energy storage device in the current scenario. When the device status of the energy storage device is the second hibernation state, it means that the energy storage device has not received any power commands or responded to any power commands for a period of time, and the energy storage converter of the power module of the energy storage device is in a shutdown state.

[0052] Based on this, when controlling the energy storage device to enter the third sleep state, it is first necessary to determine the status of the energy storage device and confirm that it is currently in the second sleep state for a certain duration. That is, the energy storage device checks whether the second duration is greater than the third time threshold. The second duration is the duration during which the energy storage device is in the second sleep state, during which it does not receive any power commands. Therefore, the second duration can be used to determine whether the current scenario does not require the energy storage device to respond to power commands for an extended period. The third time threshold is used to determine whether the second time meets the conditions for the energy storage device to enter the third sleep state. It is set by the operator according to the actual application scenario. In this case, if the second duration is greater than the third time threshold, the energy storage device enters the third sleep state. After the energy storage device has already shut down the energy storage converter in the power module, it sends a power-down command to the battery management module in the battery pack, disconnecting the main positive and auxiliary relays on the DC side and the auxiliary relays on the DC side. At this time, the energy storage device only maintains power supply to necessary modules such as the control module, dynamic environment, and liquid cooling unit to reduce the standby energy consumption of the energy storage device.

[0053] Based on the current status of the energy storage device, the device is controlled to enter a third sleep state by combining a second duration and a preset third time threshold. This allows for the selection of a sleep state that is appropriate for the current usage scenario of the energy storage device, thereby balancing energy saving and power command response.

[0054] In some embodiments, before the aforementioned step S21, the method further includes: S23: obtaining the scheduling power and charging / discharging power of the energy storage device; determining whether the energy storage device is in an idle state based on the scheduling power and charging / discharging power; if the energy storage device is in an idle state, controlling the energy storage device to enter a first hibernation state based on a first duration and a first time threshold.

[0055] It is understandable that the dispatch power of an energy storage device is the power value that the energy storage device must output or absorb, as instructed by the external control equipment. The unit is usually MW or kW, and it can be positive or negative. If the dispatch power of the energy storage device is positive, it means that the energy storage device is in a discharging state, and the energy storage device outputs power to external equipment or the power grid according to the instructions. If the dispatch power of the energy storage device is negative, it means that the energy storage device is in a charging state, and the energy storage device absorbs power from the power grid according to the instructions. If the dispatch power of the energy storage device is 0, it means that the energy storage device is in a non-working state (standby state), and the energy storage device maintains grid connection but does not participate in power exchange.

[0056] Generally, the dispatch power is equal to the charging and discharging power of the energy storage device. However, since the charging and discharging power of the energy storage device can be zero even when it has dispatch power, meaning it can enter an unloaded state, it is necessary to determine whether the energy storage device is in an unloaded state based on its charging and discharging power. Specifically, when the charging and discharging power of the energy storage device is 0, it is in an unloaded state. For example, if the dispatch power of the energy storage device is positive, it should be in a discharging state. However, if the energy storage device responds to a discharging prohibition command sent by an external control device, it cannot output power, so its charging and discharging power is 0. Although the dispatch power is not zero, the energy storage device is in an unloaded state. Similarly, if the dispatch power of the energy storage device is negative, it should be in a charging state. However, if the energy storage device responds to a charging prohibition command sent by an external control device, it cannot absorb active power from any port (grid, photovoltaic, load) to the battery pack, so its charging and discharging power is 0. Although the dispatch power is not zero, the energy storage device is in an unloaded state.

[0057] Since the first duration is actually the length of time the energy storage device is in an idle state, it is impossible to control the energy storage device to enter the first hibernation state if it is not in an idle state. Therefore, before determining whether the energy storage device can enter the first hibernation state, it is necessary to first determine whether the energy storage device is in an idle state based on the dispatch power of the energy storage device, so as to accurately control the energy storage device to enter the corresponding hibernation state.

[0058] In some embodiments, prior to step S22, the method further includes: S25: in response to a control signal sent by an external control device, controlling the power module to enter the power-on state to adjust the device state of the energy storage device to the operating state.

[0059] As described above, after the energy storage device enters the second hibernation state, the energy storage converter in the power module of the energy storage device enters the shutdown state. Therefore, before determining whether the energy storage device can enter the third hibernation state, if the energy storage device receives a control signal from an external control device, such as a power command or power scheduling request, the energy storage device will respond to the received control signal first, switching the energy storage converter in the power module to the power-on state, thereby enabling the energy storage device to switch from the second hibernation state to the operating state. In some embodiments, the external control device is a host computer front-end display interface; in other embodiments, the external control device is an external EMS such as a cloud platform, used to send control signals to the energy storage device.

[0060] Before determining whether the energy storage device can enter the third sleep state, it is first determined whether the energy storage device has received power scheduling-related control signals. The energy storage device is then switched to the operating state to prioritize responding to power scheduling-related control signals. This avoids the increased response time caused by the energy storage device responding to control signals after entering the third sleep state, allowing the energy storage device to simultaneously take into account energy saving in the sleep state and response to function scheduling-related control signals.

[0061] In some embodiments, the method S100 further includes: S26: the device state includes a fault state; if the device state of the energy storage device is a fault state, then the power module is controlled to enter a shutdown state, and the battery pack is controlled to power off.

[0062] Understandably, the equipment status of energy storage devices also includes fault states, such as abnormal battery pack conditions or abnormal temperature of the energy storage device. In such cases, it is necessary to control the energy storage device to stop working and quickly enter a shutdown state. Therefore, if the energy storage device is in a fault state, the energy storage inverter in the energy storage device's control power module switches to the shutdown state to control the power module to enter the shutdown state. At the same time, the battery control module in the control battery pack controls the battery pack to power down, so as to completely disconnect the power to the energy storage device and enter a shutdown state.

[0063] When an energy storage device enters a fault state, it first controls the power module to shut down, and then controls the battery pack to power down, so that the energy flow, current and voltage of the energy storage device return to zero at the same time. This can prevent secondary disasters and provide maintenance personnel with a safe and maintainable channel.

[0064] As shown in Figure 3, in some embodiments, the energy storage device also stores corresponding setting parameters, including enabling parameters (enabling parameters for switching from no-load state to dormant state and enabling parameters for switching from dormant state to shutdown state) and preset time thresholds (first time threshold, second time threshold and third time threshold). The enabling parameter is 1 to indicate that it is enabled, and the enabling parameter is 0 to indicate that it is not enabled. The default value of the enabling parameter is 1.

[0065] The energy storage device first reads the storage settings parameters, then determines the current device status. If the current device status is running, it checks if the enable parameter for transitioning from idle to hibernation is 1. If it is 0, it returns directly. If it is 1, it checks if the current hibernation scheme is controlled by an external control device. If it is, it also returns directly. If it is not controlled by an external device, it further checks if the current energy storage device is in an idle state. If not, it returns directly. If it is, it checks if the first duration is greater than the second time threshold. If it is greater than the second time threshold, the energy storage device enters the second hibernation state. If it is less than the second time threshold, it checks if the first duration is greater than the first time threshold. If it is greater than the first time threshold, the energy storage device enters the first hibernation state. If it is less than the first time threshold, it returns directly.

[0066] If the current energy storage device is in the second sleep state, it sends a shutdown command to the energy storage converter in the power module, controlling the energy storage converter to shut down and disconnecting the AC / DC relay on the side of the energy storage converter. Then, it checks whether the current energy storage device has received a power dispatch control command. If it has, it controls the energy storage converter in the power module to start up, thereby switching the device's state from the second sleep state to the running state to respond to the power dispatch control command. If no control command is received, it checks whether the sleep state to shutdown state enable parameter is 1. If it is 0, it returns directly. If it is 1, it checks whether the second duration is greater than the third time threshold. If the second duration is greater than the third time threshold, the energy storage device powers down and enters the third sleep state. If the second duration is less than the third time threshold, it returns directly to re-evaluate.

[0067] If the current energy storage device is in the third hibernation state or a fault state, the energy storage device sends a shutdown command to the energy storage converter in the power module to control the power module to shut down; at the same time, the energy storage device sends a power-down command to the battery control module in the battery pack, disconnects the auxiliary relay, controls the battery pack to power down, so as to realize the power-down of the energy storage device.

[0068] Secondly, embodiments of this application also provide an energy storage device, as shown in FIG4, including: a battery pack, a control module, and a power module; the control module is communicatively connected to the power module and the battery pack respectively, and the control module is configured to collect electrical signal data of the battery pack and send control signals to the power module and the battery pack according to the electrical signal data to control the energy consumption of the energy storage device; and the control module is also configured to perform the method provided in any of the first aspects.

[0069] In some embodiments, as shown in FIG4, the battery pack includes a battery cell, a battery management module, and a battery control module; wherein, the battery cell is electrically connected to one end of the battery management module and one end of the battery control module, and the other end of the battery management module is communicatively connected to the other end of the battery control module; the battery management module is configured to collect electrical signal parameters of the battery cell in real time and transmit the electrical signal parameters to the battery control module; the battery control module is configured to send the electrical signal parameters to the control module and control the battery control module to adjust the power supply of the battery cell based on the control signals transmitted by the control module.

[0070] Thirdly, embodiments of this application also provide an energy storage system, as shown in FIG5, including: an external control device and an energy storage device as provided in the second aspect, wherein, in some embodiments, the external control device is a host computer front-end display interface; in other embodiments, the external control device is an external EMS such as a cloud platform.

[0071] In summary, this embodiment of the application sets up a first sleep state, a second sleep state, and a third sleep state with different energy consumption. By combining the device status, a first duration, and a second duration of the energy storage device, the energy storage device is controlled to enter different sleep states. This makes the energy storage device more intelligent in terms of sleep and energy saving, enabling flexible configuration of sleep schemes through various means according to different operating conditions, and reducing the risk of battery over-discharge due to prolonged standby. Furthermore, since the response time of the energy storage device to power commands differs in different sleep states, controlling the energy storage device to enter different sleep states by combining the device status, the first duration, and the second duration can reduce energy consumption in standby mode while also ensuring the energy storage device's responsiveness to power commands.

[0072] It should be noted that the device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs.

[0073] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented using software and a general-purpose hardware platform, or of course, using hardware. Those skilled in the art will understand that all or part of the processes in the above embodiments can be implemented by a computer program instructing related hardware. The program can be stored in a computer-readable storage medium, and when executed, it can include the processes of the embodiments of the above methods. The storage medium can be a magnetic disk, optical disk, read-only memory (ROM), or random access memory (RAM), etc.

[0074] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them; under the concept of this application, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of this application as described above, which are not provided in detail for the sake of brevity; although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. An energy-saving method for an energy storage device, characterized in that, The energy storage device includes a battery pack and a power module. The method includes: acquiring the device status of the energy storage device, a first duration, and a second duration; controlling the energy storage device to enter a first sleep state or a second sleep state based on the device status and the first duration to reduce the energy consumption of the energy storage device; or, controlling the energy storage device to enter a third sleep state based on the device status and the second duration to reduce the energy consumption of the energy storage device; wherein the energy consumption of the energy storage device decreases sequentially in the first sleep state, the second sleep state, and the third sleep state.

2. The method according to claim 1, characterized in that, The device status includes the operating status. The step of controlling the energy storage device to enter the first hibernation state or the second hibernation state based on the device status and the first duration includes: if the device status of the energy storage device is the operating state, determining whether the first duration is greater than a second time threshold; if so, controlling the energy storage device to enter the second hibernation state.

3. The method according to claim 2, characterized in that, The method of controlling the energy storage device to enter a first hibernation state or a second hibernation state based on the device status and the first duration further includes: if the device status of the energy storage device is the operating state, determining whether the first duration is greater than a first time threshold; if so, controlling the energy storage device to enter the first hibernation state.

4. The method according to claim 1, characterized in that, Controlling the energy storage device to enter a third hibernation state based on the device status and the second duration includes: if the device status of the energy storage device is the second hibernation state, determining whether the second duration is greater than a third time threshold; if so, controlling the energy storage device to enter the third hibernation state.

5. The method according to claim 2, characterized in that, Before determining whether the first duration is greater than the first time threshold, the method further includes: obtaining the scheduling power of the energy storage device; determining whether the energy storage device is in an idle state based on the scheduling power; if the energy storage device is in the idle state, controlling the energy storage device to enter the first hibernation state based on the first duration and the first time threshold.

6. The method according to claim 4, characterized in that, Before determining whether the second duration is greater than the third time threshold, the method further includes: responding to a control signal sent by an external control device, controlling the power module to enter the power-on state, so as to adjust the device state of the energy storage device to the operating state.

7. The method according to claim 4, characterized in that, The device status includes a fault status; if the energy storage device is in the fault status, then the power module is controlled to enter the shutdown state, and the battery pack is controlled to power off.

8. An energy storage device, characterized in that, include: The device comprises a battery pack, a control module, and a power module; the control module is communicatively connected to the power module and the battery pack, and is configured to acquire electrical signal data of the battery pack and send control signals to the power module and the battery pack based on the electrical signal data to control the energy consumption of the energy storage device; and the control module is further configured to perform the method as described in any one of claims 1-7.

9. The device according to claim 8, characterized in that, The battery pack includes a battery cell, a battery management module, and a battery control module. The battery cell is electrically connected to one end of the battery management module and one end of the battery control module, respectively, and the other end of the battery management module is communicatively connected to the other end of the battery control module. The battery management module is configured to acquire electrical signal parameters of the battery cell in real time and transmit these parameters to the battery control module. The battery control module is configured to send the electrical signal parameters to the control module and, based on the control signals transmitted by the control module, control the battery control module to adjust the power supply to the battery cell.

10. An energy storage system, characterized in that, include: External control equipment, and the energy storage device as described in claim 8.

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