Energy storage device management method and energy storage device

Abstract

The application discloses an energy storage device management method and an energy storage device. The energy storage device management method comprises the following steps: when the current operation mode of the energy storage device is a network construction mode, judging whether the current power of the energy storage device is in a preset power interval; when the current power of the energy storage device is greater than the maximum value of the preset power interval, determining the power interval in which the current power of the energy storage device is located; when the duration that the current power of the energy storage device is in the current power interval reaches the maximum duration of the current power interval, limiting the power of the energy storage device to a preset power and determining whether to control the energy storage device to stop according to the comparison between the power of the energy storage device after a preset delay and the preset power; when the duration that the current power of the energy storage device is in the current power interval does not reach the maximum duration of the current power interval, re-determining whether the current power of the energy storage device is in the preset power interval. By using the above method, the operation life of the energy storage device in the network construction mode can be improved.

Description

Technical Field

[0001] This invention relates to the field of energy storage technology, and in particular to an energy storage device management method and an energy storage device. Background Technology

[0002] Grid-based energy storage is a core cornerstone supporting the stable operation of power grids with a high proportion of renewable energy sources. Its necessity stems from its ability to proactively construct the voltage and frequency framework of the power grid, replacing the stabilization function of traditional synchronous generators. In power systems dominated by renewable energy, it addresses key challenges such as lack of inertia, weak grid instability, and insufficient fault recovery capabilities. It provides grid-connected "anchor points" for fluctuating power sources such as wind and solar power, and achieves key capabilities such as millisecond-level frequency regulation, black start, and islanded operation. Currently, grid-based energy storage has evolved from a technological option to an indispensable stable infrastructure for new power systems, ensuring the safety and resilience of the power grid during the energy transition.

[0003] However, in the existing technology, the management and control strategy of grid-based energy storage is the same as that of grid-connected energy storage. It cannot be applied to the protection of energy storage devices that experience large current fluctuations in grid-based mode, which also results in a shorter operating life of energy storage devices in grid-based mode. Summary of the Invention

[0004] This invention provides an energy storage device management method and an energy storage device to solve the problem of short operating life of energy storage devices in grid-connected mode.

[0005] According to one aspect of the present invention, an energy storage device management method is provided, applied to an energy storage device, the energy storage device management method comprising:

[0006] Obtain the current operating mode of the energy storage device;

[0007] When the current operating mode of the energy storage device is grid-connected mode, it is determined whether the current power of the energy storage device is within a preset power range;

[0008] When the current power of the energy storage device is greater than the maximum value of the preset power range, the power range in which the current power of the energy storage device is located is determined;

[0009] When the duration during which the current power of the energy storage device is within the current power range reaches the maximum duration of the current power range, the power of the energy storage device is limited to a preset power, and a comparison between the power of the energy storage device after a preset delay and the preset power is used to determine whether to control the energy storage device to shut down.

[0010] If the duration during which the current power of the energy storage device is within the current power range does not reach the maximum duration of the current power range, the current power of the energy storage device is re-determined to determine whether it is within the preset power range.

[0011] Optionally, the specific method for determining whether to control the energy storage device to shut down based on the comparison between the power of the energy storage device after a preset delay and the preset power includes:

[0012] When the power of the energy storage device after a preset delay is less than or equal to the preset power, the energy storage device is controlled to operate in grid-connected mode.

[0013] When the power of the energy storage device after a preset delay exceeds the preset power, the energy storage device is controlled to shut down.

[0014] Optionally, the energy storage device includes an output switching unit and multiple energy storage units; the specific method for controlling the shutdown of the energy storage device includes:

[0015] When the first delay is reached, the output switch is turned off;

[0016] When the second delay is reached, the circuit breaker of the energy storage unit is turned off;

[0017] When the third delay is reached, the contactor of the energy storage unit is turned off; wherein the first delay is greater than the second delay, and the second delay is greater than the third delay.

[0018] Optionally, after determining whether the current power of the energy storage device is within a preset power range, the method further includes:

[0019] When the current power of the energy storage device is within the preset power range, the energy storage device is maintained in grid-connected mode.

[0020] Optionally, after determining whether the current power of the energy storage device is within a preset power range, the method further includes:

[0021] When the current power of the energy storage device is less than the minimum value of the preset power range, it is determined whether to switch to grid-connected mode based on the duration for which the current power of the energy storage device is less than the minimum value of the preset power range.

[0022] Optionally, the specific method for determining whether to switch to grid-connected mode based on the duration for which the current power of the energy storage device is less than the minimum value of the preset power range includes:

[0023] When the duration for which the current power of the energy storage device is less than the minimum value of the preset power range is greater than a first preset duration, the energy storage device switches to grid-connected mode.

[0024] When the duration for which the current power of the energy storage device is less than the minimum value of the preset power range is less than or equal to the first preset duration, the energy storage device is maintained in grid-connected mode.

[0025] Optionally, the specific method for obtaining the current operating mode of the energy storage device includes:

[0026] Upon receiving the network signal, determine whether the energy storage device has any alarm information;

[0027] When there is no alarm information from the energy storage device, the energy storage device operates in grid-connected mode;

[0028] When an alarm is detected in the energy storage device, the energy storage device operates in grid-connected mode.

[0029] Optionally, the specific method for obtaining the current operating mode of the energy storage device includes:

[0030] Obtain the current of the energy storage device;

[0031] When the current of the energy storage device is greater than or equal to a preset multiple of the rated current and the duration of the current of the energy storage device being greater than or equal to a preset multiple of the rated current is greater than a second preset duration, it is determined whether the energy storage device has an alarm message.

[0032] When there is no alarm information from the energy storage device, the energy storage device operates in grid-connected mode;

[0033] When an alarm is detected in the energy storage device, the energy storage device operates in grid-connected mode.

[0034] According to another aspect of the present invention, an energy storage device is also provided for performing the energy storage device management method described in any of the above embodiments, the energy storage device comprising: an energy storage converter unit, an output switch unit, and a plurality of energy storage units;

[0035] The energy storage unit includes a circuit breaker, a contactor, and an energy storage component. The positive terminal of the energy storage component is coupled to the first terminal of the output switching unit through the contactor and the circuit breaker. The negative terminal of the energy storage component is coupled to the second terminal of the output switching unit through the contactor and the circuit breaker. The third and fourth terminals of the output switching unit are coupled to the DC side of the energy storage converter unit, and the AC side of the energy storage converter unit is coupled to the power grid.

[0036] Optionally, the energy storage device further includes: a battery array management unit, a battery cluster management unit, and multiple battery cell management units;

[0037] Each battery cell management unit is connected to a battery cell in the energy storage module in a one-to-one correspondence. Each battery cell management unit is coupled to the battery cluster management unit in a daisy chain. The battery cluster management unit is coupled to the circuit breaker, the contactor and the battery array management unit respectively. The battery array management unit is also coupled to the output switch unit and the host computer.

[0038] This invention determines whether the energy storage device is shut down based on its current power, thereby protecting the energy storage device under high current fluctuation conditions in grid-connected mode and improving the lifespan of the energy storage device in grid-connected mode.

[0039] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0040] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0041] Figure 1 This is a flowchart of an energy storage device management method provided in an embodiment of the present invention;

[0042] Figure 2 This is a flowchart of another energy storage device management method provided in an embodiment of the present invention;

[0043] Figure 3 This is a flowchart of another energy storage device management method provided in an embodiment of the present invention;

[0044] Figure 4 This is a schematic diagram of an energy storage device provided in an embodiment of the present invention. Detailed Implementation

[0045] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0046] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0047] This invention provides a method for managing energy storage devices. This method is applicable to energy storage devices and manages their operation in grid-connected mode. Figure 1 This is a flowchart of an energy storage device management method provided in an embodiment of the present invention. (Refer to...) Figure 1 The energy storage device management method includes:

[0048] S110, Obtain the current operating mode of the energy storage device.

[0049] Specifically, energy storage devices operate in two modes: grid-connected mode and grid-following mode. Grid-connected mode can be triggered by an external signal or self-triggered based on the device's current. It's important to note that entering grid-connected mode requires the energy storage device to be operating normally, i.e., without faults. Even if the energy storage device receives a grid-connected signal or its current meets the grid-connected mode operating conditions, it will still operate in grid-following mode if a fault exists. The current in the energy storage device can be either input or output current, depending on its operating conditions.

[0050] When the grid connection mode of the energy storage device is triggered by a grid connection signal, upon receiving the grid connection signal, the system checks for alarm information from the energy storage device to determine if a fault exists. If there is no alarm information, it indicates that the energy storage device is fault-free, and it operates in grid connection mode. If there is an alarm information, it indicates that the energy storage device is faulty, and it operates in grid-following mode.

[0051] When the energy storage device self-triggers based on its current, the system acquires the device's current. If the current is greater than or equal to a preset multiple of the rated current, and the duration of this current's presence exceeds a second preset duration, the system determines if an alarm is detected. If no alarm is detected, the device is fault-free and operates in grid-connected mode. If an alarm is detected, the device is faulty and operates in grid-following mode. It should be noted that the second preset duration is the minimum time required for the current to be greater than or equal to a preset multiple of the rated current to trigger grid-connected mode. Due to varying operating conditions, the current in grid-following mode may exceed a preset multiple of the rated current for short periods. Therefore, a specific timeframe must be set as the trigger condition for grid-connected mode, i.e., the second preset duration must be defined.

[0052] The current in the energy storage device can be either the input current or the output current, depending on the operating conditions of the energy storage device.

[0053] S120. When the current operating mode of the energy storage device is grid-connected mode, determine whether the current power of the energy storage device is within the preset power range.

[0054] Specifically, the grid-connected mode of the energy storage device can operate within multiple power ranges. The preset power range is a pre-defined power range within which the energy storage device can operate in grid-connected mode for an extended period. In practical applications, this range can be set according to the performance of the energy storage device itself. For example, the preset power range can be set from the rated power to 1.1 times the rated power. When the current power of the energy storage device exceeds the maximum value of the preset power range, the energy storage device can still operate in grid-connected mode, but the duration of operation in this mode is limited; that is, the energy storage device cannot operate in grid-connected mode for an extended period. Furthermore, it should be noted that when the current power of the energy storage device exceeds the minimum value of the preset power range, the energy storage device cannot operate in grid-connected mode and will operate in grid-following mode.

[0055] S130. When the current power of the energy storage device is greater than the maximum value of the preset power range, determine the power range in which the current power of the energy storage device is located.

[0056] Specifically, when the current power of the energy storage device exceeds the maximum value of a preset power range, the operating time of the energy storage device in grid-connected mode is limited. In this case, the maximum operating time of the energy storage device in grid-connected mode is related to its current power. The maximum operating time varies depending on the power range in which the current power falls. Different power ranges correspond to different maximum operating times. When the current power of the energy storage device exceeds the maximum value of the preset power range, the maximum operating time of the energy storage device in grid-connected mode can be determined by the power range in which the current power falls.

[0057] For example, the energy storage device has five power ranges in addition to the preset power range. The preset power range is from the rated power to 1.1 times the rated power. The first power range is from 1.1 times the rated power to 1.2 times the rated power, with a maximum operating time of 120 seconds; the second power range is from 1.2 times the rated power to 1.5 times the rated power, with a maximum operating time of 60 seconds; the third power range is from 1.5 times the rated power to 3.0 times the rated power, with a maximum operating time of 15 seconds; the fourth power range is from 3.0 times the rated power to 3.1 times the rated power, with a maximum operating time of 10 seconds; and the fifth power range is 3.1 times the rated power and above, with a maximum operating time of 3 seconds. The boundaries of each power range, i.e., whether the maximum and minimum values ​​are included within the range, can be set according to actual needs.

[0058] S140. When the duration of the current power of the energy storage device within the current power range reaches the maximum duration of the current power range, the power of the energy storage device is limited to a preset power, and the power of the energy storage device after the preset delay is compared with the preset power to determine whether to control the energy storage device to shut down.

[0059] Specifically, the maximum operating time of an energy storage device at its current power can be determined based on the power range in which the current power of the energy storage device is located.

[0060] For example, when the current power of the energy storage device is within the first power range, that is, within the range of 1.1 times the rated power to 1.2 times the rated power, if the duration of the energy storage device within this power range reaches 120 seconds, the power of the energy storage device will be limited, that is, the power of the energy storage device will be limited to a preset power.

[0061] Because the power of an energy storage device requires a certain amount of time to change, after limiting the power of the energy storage device, a certain delay is needed before its power changes to or below the preset power. Therefore, whether the energy storage device should be shut down depends on comparing the power of the energy storage device after the delay with the preset power. When the power of the energy storage device after the preset delay is less than or equal to the preset power, the energy storage device is controlled to exit the grid-connected mode and operate in grid-following mode; when the power of the energy storage device after the preset delay is greater than the preset power, the energy storage device is controlled to shut down. Specifically, when the energy storage device exits the grid-connected mode, the time for its next entry into grid-connected mode can be limited. That is, when the energy storage device exits the grid-connected mode, it is prohibited from re-entering the grid-connected mode for a certain period of time to avoid insufficient thermal protection of the energy storage device due to excessively short time intervals between two grid-connected mode operations.

[0062] In practical applications, the time during which energy storage devices are prohibited from entering grid-connected mode can be related to the power range at which they exit grid-connected mode. The prohibition times for different power ranges can be the same or different, and can be set according to actual needs. For example, in the first power range (1.1 to 1.2 times the rated power), the prohibition time for energy storage devices to enter grid-connected mode is 2 hours; in the second range (1.2 to 1.5 times the rated power), it is 2 hours; in the third range (1.5 to 3.0 times the rated power), it is 2 hours; in the fourth range (3.0 to 3.1 times the rated power), it is 1 hour; and in the fifth range (3.1 times the rated power and above), it is 0.5 hours.

[0063] It should be noted that while the energy storage device is shut down, an overcurrent protection alarm can also be issued to the user to alert them that an overcurrent has occurred in the energy storage device. Depending on the operating conditions of the energy storage device, the overcurrent warning includes charging overcurrent warning and discharging overcurrent warning.

[0064] For example, the shutdown method of an energy storage device can be set according to the device's own architecture. Taking an energy storage device with an output switch and multiple energy storage units as an example, the specific shutdown method can be as follows: upon reaching a first delay, the output switch is turned off; upon reaching a second delay, the circuit breaker of the energy storage unit is turned off; and upon reaching a third delay, the contactor of the energy storage unit is turned off. The first delay is longer than the second delay, the second delay is longer than the third delay, and the durations of the first, second, and third delays can be determined according to actual conditions.

[0065] S150. If the duration during which the current power of the energy storage device is within the current power range does not reach the maximum duration of the current power range, re-determine whether the current power of the energy storage device is within the preset power range.

[0066] Specifically, the power of an energy storage device varies depending on its operating conditions. When the current power of the energy storage device changes to outside the power range before reaching its maximum duration—that is, when it changes from one power range to another, but the duration in the previous power range does not reach its maximum duration—it is necessary to determine whether the changed power of the energy storage device is within the preset power range in order to determine whether the energy storage device can operate in grid-connected mode for an extended period.

[0067] When the power of the energy storage device after the change is within the preset power range, the energy storage device can operate in grid mode for a long time; when the power of the energy storage device after the change is greater than the maximum value of the preset power range, the power range in which the current power of the energy storage device is located is determined in order to determine the maximum operating time of the energy storage device in grid mode under the new power.

[0068] In this embodiment of the invention, when the current operating mode of the energy storage device is grid-connected, it determines whether the current power of the energy storage device is within a preset power range. If the current power of the energy storage device is greater than the maximum value of the preset power range, the power range in which the current power of the energy storage device falls is determined. If the duration for which the current power of the energy storage device remains within the current power range reaches the maximum duration of the current power range, the power of the energy storage device is limited to a preset power, and a comparison is made between the power of the energy storage device after a preset delay and the preset power to determine whether to control the energy storage device to shut down. This embodiment of the invention determines whether the energy storage device should shut down based on its current power, thereby protecting the energy storage device under high current fluctuation conditions in grid-connected mode and improving the operating life of the energy storage device in grid-connected mode.

[0069] It should be noted that in practical applications, the shutdown of an energy storage device requires the coordinated operation of the output switch, the circuit breaker of the energy storage unit, and the contactor of the energy storage unit. Each operation of the output switch, circuit breaker, and contactor incurs certain losses, and their lifespan decreases as these losses increase. Therefore, for the energy storage device to operate normally, it is necessary to statistically analyze the lifespan of the operating devices within the device, specifically the output switch, circuit breaker, and contactor, to provide early warnings. The lifespan of these operating devices can be calculated using equivalent operating cycles.

[0070] Specifically, operating devices such as output switches, circuit breakers, and contactors can have a weight of 100,000 (100%). The lifespan weight consumed in each operation is determined by looking up the lifespan weight in the operating device's lifespan table (including current, voltage, and lifespan weight). When the lifespan weight reaches 100,000 (100%), the operating device is considered to have reached the end of its service life. Table 1 is a lifespan weight consumption table for operating devices provided in an embodiment of the present invention. Exemplarily, the lifespan weight consumed in each operation of the operating device can be determined using current and voltage.

[0071] Table 1

[0072]

[0073] In practical applications, the lifespan of the motion device can be graded and alarmed based on its current consumed lifespan weight. For example, a level 3 alarm is triggered when the current consumed lifespan weight reaches 0.8 times the total lifespan weight; a level 2 alarm is triggered when the current consumed lifespan weight reaches 0.9 times the total lifespan weight, prompting the user to pay attention to the device's lifespan; and a level 1 alarm is triggered when the current consumed lifespan weight reaches 0.95 times the total lifespan weight, prompting the user to replace the device.

[0074] Figure 2 This is a flowchart of another energy storage device management method provided by an embodiment of the present invention. Optionally, based on the above embodiments, after determining whether the current power of the energy storage device is within a preset power range, the method further includes:

[0075] S160. When the current power of the energy storage device is within the preset power range, maintain the energy storage device in grid-connected mode.

[0076] Specifically, the preset power range is a pre-defined power range within which the energy storage device can operate in grid-connected mode for an extended period. When the current power of the energy storage device is within the preset power range, it is not necessary to determine the maximum duration of operation of the energy storage device in grid-connected mode; in this case, it is sufficient to maintain the operation of the energy storage device in grid-connected mode.

[0077] Figure 3 This is a flowchart of another energy storage device management method provided by an embodiment of the present invention. Optionally, based on the above embodiments, after determining whether the current power of the energy storage device is within a preset power range, the method further includes:

[0078] S170. When the current power of the energy storage device is less than the minimum value of the preset power range, determine whether to switch to grid-connected mode based on the duration for which the current power of the energy storage device is less than the minimum value of the preset power range.

[0079] Specifically, in practical applications, due to different operating conditions of energy storage devices, the power of an energy storage device operating in grid-connected mode may be lower than the minimum value of a preset power range in the short term. Therefore, in application, a first preset duration can be set as the criterion for determining whether the energy storage device should switch to grid-connected mode. The first preset duration is the maximum duration for which the power of the energy storage device is lower than the minimum value of the preset power range when operating in grid-connected mode.

[0080] When the duration for which the current power of the energy storage device is less than the minimum value of the preset power range is greater than the first preset duration, the energy storage device switches to grid-connected mode; when the duration for which the current power of the energy storage device is less than the minimum value of the preset power range is less than or equal to the first preset duration, the energy storage device remains in grid-connected mode.

[0081] This invention also provides an energy storage device. This energy storage device is used to execute the energy storage device management method provided in any of the above embodiments. Figure 4 This is a schematic diagram of an energy storage device provided in an embodiment of the present invention. (Refer to...) Figure 4 The energy storage device includes: an energy storage converter unit 110, an output switch unit 120, and multiple energy storage units 130.

[0082] The energy storage unit 130 includes a circuit breaker 131, a contactor 132, and an energy storage component 133. The positive terminal of the energy storage component 130 is coupled to the first terminal of the output switching unit 120 through the contactor 132 and the circuit breaker 131. The negative terminal of the energy storage component 130 is coupled to the second terminal of the output switching unit 120 through the contactor 132 and the circuit breaker 131. The third and fourth terminals of the output switching unit 120 are coupled to the DC side of the energy storage converter unit 110. The AC side of the energy storage converter unit 110 is coupled to the power grid 10.

[0083] The energy storage device provided in this embodiment has the beneficial effects of the energy storage device management method provided in any of the above embodiments, which will not be repeated here.

[0084] Based on the above embodiments, optionally, refer to... Figure 4 The energy storage device also includes a battery array management unit 140, a battery cluster management unit 150, and multiple battery cell management units 160.

[0085] Each battery cell management unit 160 is connected to a battery cell in the energy storage component 133. Each battery cell management unit 160 is daisy-chained to a battery cluster management unit 150. The battery cluster management unit 150 is coupled to a circuit breaker 131, a contactor 132 and a battery array management unit 140. The battery array management unit 140 is also coupled to an output switch unit 120 and a host computer 20.

[0086] It should be understood that the various forms of processes shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this invention can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this invention can be achieved, and no limitation is imposed herein.

[0087] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. An energy storage device management method, characterized by, The application is applied to an energy storage device, and the energy storage device management method comprises: acquiring a current operation mode of the energy storage device; when the current operation mode of the energy storage device is a network building mode, judging whether the current power of the energy storage device is in a preset power interval; when the current power of the energy storage device is greater than the maximum value of the preset power interval, determining a power interval in which the current power of the energy storage device is located; when the duration that the current power of the energy storage device is in the current power interval reaches the maximum duration of the current power interval, limiting the power of the energy storage device to a preset power, when the power of the energy storage device after a preset delay is less than or equal to the preset power, controlling the energy storage device to operate in a network following mode, and when the power of the energy storage device after a preset delay is greater than the preset power, controlling the energy storage device to stop; wherein, after controlling the energy storage device to exit the network building mode, a delay time for prohibiting the energy storage device from entering the network building mode again is set according to the power interval in which the energy storage device is located when the energy storage device exits the network building mode; when the duration that the current power of the energy storage device is in the current power interval does not reach the maximum duration of the current power interval, re-determining whether the current power of the energy storage device is in the preset power interval.

2. The energy storage device management method according to claim 1, wherein The energy storage device comprises an output switch unit and a plurality of energy storage units; and the specific method for controlling the energy storage device to stop comprises: when a first delay is reached, turning off the output switch; when a second delay is reached, turning off the circuit breaker of the energy storage unit; when a third delay is reached, turning off the contactor of the energy storage unit; wherein, the first delay is greater than the second delay, and the second delay is greater than the third delay.

3. The energy storage device management method according to claim 1, wherein After judging whether the current power of the energy storage device is in the preset power interval, the method further comprises: when the current power of the energy storage device is in the preset power interval, maintaining the energy storage device in the network building mode.

4. The energy storage device management method according to claim 1, wherein After judging whether the current power of the energy storage device is in the preset power interval, the method further comprises: when the current power of the energy storage device is less than the minimum value of the preset power interval, determining whether to switch to the network following mode according to the duration that the current power of the energy storage device is less than the minimum value of the preset power interval.

5. The energy storage device management method according to claim 4, wherein The specific method for determining whether to switch to the network following mode according to the duration that the current power of the energy storage device is less than the minimum value of the preset power interval comprises: when the duration that the current power of the energy storage device is less than the minimum value of the preset power interval is greater than a first preset duration, the energy storage device is switched to operate in the network following mode; when the duration that the current power of the energy storage device is less than the minimum value of the preset power interval is less than or equal to the first preset duration, the energy storage device is maintained in the network building mode.

6. The energy storage device management method according to any one of claims 1 to 5, wherein The specific method for acquiring the current operation mode of the energy storage device comprises: when a network building signal is acquired, judging whether the energy storage device has alarm information; when the energy storage device has no alarm information, the energy storage device operates in the network building mode; when the energy storage device has alarm information, the energy storage device operates in the network following mode.

7. The energy storage device management method according to any one of claims 1 to 5, wherein The specific method for obtaining the current operation mode of the energy storage device includes: Obtaining the current of the energy storage device; When the current of the energy storage device is greater than or equal to a preset multiple of the rated current, and the duration of the current of the energy storage device being greater than or equal to a preset multiple of the rated current is greater than a second preset duration, determining whether the energy storage device has alarm information; When the energy storage device has no alarm information, the energy storage device operates in a network construction mode; When the energy storage device has alarm information, the energy storage device operates in a network following mode.

8. An energy storage device, characterized by, The energy storage device includes an energy storage converter unit, an output switch unit, and a plurality of energy storage units. The energy storage unit includes a circuit breaker, a contactor, and an energy storage assembly, the positive electrode of the energy storage assembly is coupled to the first end of the output switch unit through the contactor and the circuit breaker, the negative electrode of the energy storage assembly is coupled to the second end of the output switch unit through the contactor and the circuit breaker, the third end and the fourth end of the output switch unit are coupled to the DC side of the energy storage converter unit, and the AC side of the energy storage converter unit is coupled to the power grid.

9. The energy storage device of claim 8, wherein, Further comprising: a battery array management unit, a battery cluster management unit, and a plurality of battery cell management units; The battery cell management unit is connected one-to-one with the battery cell in the energy storage assembly, each battery cell management unit is coupled to the battery cluster management unit in a daisy chain form, the battery cluster management unit is coupled to the circuit breaker, the contactor, and the battery array management unit, respectively, and the battery array management unit is further coupled to the output switch unit and the upper computer.

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