Energy storage system overload control method and device and energy storage system

Abstract

The invention discloses an energy storage system overload control method and device and an energy storage system, and belongs to the technical field of energy storage control, the energy storage system comprises a battery and an inverter, the battery supplies power to a load through the inverter, and the method comprises the following steps: determining a set value of a maximum allowable discharge current of the battery; when the battery meets the allowable overload condition, increasing the maximum allowable discharge current of the battery from a set value to an overload value; the maximum allowable discharge current of the battery is transmitted to the inverter such that the battery-side current of the inverter does not exceed the overload value. When the battery meets the allowable overload condition, the set value of the maximum allowable discharge current of the battery is increased to the overload value, and the maximum allowable discharge current of the battery is transmitted to the inverter, so that the battery can support short-time overload, and the possibility of successful instant starting when the inverter is connected to a high-power load is increased.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of energy storage control, and particularly relates to an energy storage system overload control method and device and an energy storage system. BACKGROUND

[0002] In the related art, when an inverter of an energy storage system is connected to a load for starting, large power support may be required. When the rated power of a battery cannot meet the load starting power, load starting failure may occur. The existing energy storage system cannot support short-time overload, and the inverter is prone to starting failure when connected to a large-power load, which brings many inconveniences to the actual application of energy storage control. SUMMARY

[0003] The application provides an energy storage system overload control method, device and energy storage system to solve the problem that the related art cannot support short-time overload and the inverter is prone to starting failure when connected to a large-power load.

[0004] In a first aspect, the application provides an energy storage system overload control method, wherein the energy storage system includes a battery and an inverter, the battery supplies power to a load through the inverter, and the method includes the following steps.

[0005] determining a set value of a maximum allowable discharge current of the battery;

[0006] when the battery meets an allowable overload condition, increasing the maximum allowable discharge current of the battery from the set value to an overload value;

[0007] transmitting the maximum allowable discharge current of the battery to the inverter, so that the battery-side current of the inverter does not exceed the overload value.

[0008] In the above technical solution, when the battery of the energy storage system meets the allowable overload condition, the set value of the maximum allowable discharge current of the battery is increased to the overload value, and the maximum allowable discharge current of the battery is transmitted to the inverter. Without the need for additional information interaction about overload, the current in the process of taking power from the battery side of the inverter is controlled to not exceed the maximum allowable discharge current of the battery, the logical decoupling of the battery and the inverter is achieved, the short-time overload of the battery is realized only by limiting the maximum allowable discharge current, and the possibility of instantaneous starting success of the inverter when connected to a large-power load is improved.

[0009] According to an embodiment of the application, the method further includes adjusting the maximum allowable discharge current of the battery to the set value when the battery is overloaded and the overload duration reaches a first preset time length.

[0010] In the technical solution, when the battery is overloaded and the overload duration reaches the first preset time length, the maximum allowable discharge current of the battery is adjusted to a set value, which can reduce the damage of the battery caused by the continuous overload, and improve the service life and safety of the battery.

[0011] According to an embodiment of the present application, the method further comprises:

[0012] The set value of the maximum allowable discharge current of the battery is determined according to the current limiting matrix of the battery or the rated current of the battery.

[0013] In the technical solution, the set value of the maximum allowable discharge current of the battery is determined according to the current limiting matrix of the battery or the rated current of the battery, which can reduce the damage of the battery and improve the service life and safety of the battery.

[0014] According to an embodiment of the present application, the battery satisfies the allowable overload condition, which includes that the average voltage of the battery corresponding to the battery cell is greater than or equal to a first threshold value, the state of charge of the battery is greater than or equal to a second threshold value, the minimum temperature of the battery corresponding to the battery cell is greater than or equal to a third threshold value, and the maximum temperature of the battery corresponding to the battery cell is less than or equal to a fourth threshold value.

[0015] In the technical solution, the allowable overload condition is determined by detecting the average voltage of the battery corresponding to the battery cell, the state of charge of the battery, and the temperature of the battery corresponding to the battery cell, which can reduce the situation of over-discharge and over-temperature of the battery, enable the battery to realize short-time overload, improve the possibility of instantaneous startup success when the inverter accesses a high-power load, and improve the service life and safety of the battery.

[0016] According to an embodiment of the present application, the battery overload includes that the absolute value of the difference between the real-time current of the battery and the rated current of the battery or the set value of the maximum allowable discharge current is greater than or equal to a fifth threshold value.

[0017] In the technical solution, whether the battery is overloaded is determined by the absolute value of the difference between the real-time current of the battery and the rated current of the battery or the set value of the maximum allowable discharge current being greater than or equal to a fifth threshold value, which can improve the accuracy and practicality of the battery overload determination, enable the battery to realize short-time overload, and improve the possibility of instantaneous startup success when the inverter accesses a high-power load.

[0018] According to an embodiment of the present application, the method further comprises:

[0019] When the battery does not satisfy the allowable overload condition and does not satisfy the non-allowable overload condition, the maximum allowable discharge current of the battery is controlled to remain unchanged.

[0020] In the technical solution, when the battery does not meet the allowable overload condition and does not meet the unallowable overload condition, the maximum allowable discharge current of the battery is kept unchanged, the fluctuation of the current is reduced, and the stability of the energy storage system is improved.

[0021] According to an embodiment of the present application, the method further comprises:

[0022] When the battery meets the unallowable overload condition, the maximum allowable discharge current of the battery is controlled to be the set value.

[0023] In the technical solution, when the battery meets the unallowable overload condition, the maximum allowable discharge current of the battery is controlled to be the set value, the battery works in a normal range, and the safety and reliability of the battery are improved.

[0024] According to an embodiment of the present application, the unallowable overload condition comprises at least one of the following:

[0025] The average voltage of the battery corresponding to the battery cell is less than or equal to a sixth threshold value;

[0026] The state of charge of the battery is less than or equal to a seventh threshold value;

[0027] The minimum temperature of the battery corresponding to the battery cell is less than or equal to an eighth threshold value;

[0028] The maximum temperature of the battery corresponding to the battery cell is greater than or equal to a ninth threshold value.

[0029] In the technical solution, by setting the unallowable overload condition of the battery, when at least one of the average voltage of the battery corresponding to the battery cell is less than or equal to the sixth threshold value, the state of charge of the battery is less than or equal to the seventh threshold value, the minimum temperature of the battery corresponding to the battery cell is less than or equal to the eighth threshold value, and the maximum temperature of the battery corresponding to the battery cell is greater than or equal to the ninth threshold value, the battery is not allowed to be overloaded, the over-discharge and over-temperature of the battery are reduced, and the service life and safety of the battery are improved.

[0030] According to an embodiment of the present application, the method further comprises:

[0031] When the interval duration between the current time when the battery is overloaded and the last time when the battery is overloaded is less than a second preset duration, the maximum allowable discharge current of the battery is set to the set value.

[0032] In the technical solution, when the interval duration between the current time when the battery is overloaded and the last time when the battery is overloaded is less than a second preset duration, the maximum allowable discharge current of the battery is set to the set value, the damage of the battery caused by frequent overloading is reduced, and the service life and safety of the battery are improved.

[0033] According to one embodiment of this application, the overload value is determined based on the cell capacity and overload power requirement.

[0034] In the above technical solution, determining the overload value based on the cell capacity and overload power requirements can improve the stability of the energy storage system.

[0035] According to one embodiment of this application, the method further includes:

[0036] When the battery is overloaded and the overload duration reaches a first preset duration, the inverter is controlled to ensure that the battery-side current of the inverter does not exceed the set value of the maximum allowable discharge current.

[0037] In the above technical solution, when the battery experiences overload and the overload duration reaches a first preset time, the inverter is controlled to ensure that the battery-side current of the inverter does not exceed the set value of the maximum allowable discharge current. This adds independent protection logic to both the battery and the inverter, providing dual protection for the energy storage system. Even if either the battery or the inverter fails, it will not cause excessive damage to the energy storage system, thus improving the safety and reliability of the energy storage system.

[0038] Secondly, this application provides an overload control device for an energy storage system, the energy storage system including a battery and an inverter, the battery supplying power to a load through the inverter, the device comprising:

[0039] The battery management module is used to determine a set value for the maximum allowable discharge current of the battery; when the battery meets the allowable overload conditions, the maximum allowable discharge current of the battery is increased from the set value to the overload value; and the maximum allowable discharge current of the battery is transmitted to the inverter so that the battery-side current of the inverter does not exceed the overload value.

[0040] In the above technical solution, by raising the set value of the maximum allowable discharge current of the battery to the overload value when the battery of the energy storage system meets the allowable overload conditions, and transmitting the maximum allowable discharge current of the battery to the inverter, the inverter can control the current during the process of drawing power from the battery side to not exceed the maximum allowable discharge current of the battery without adding additional information interaction about overload. This achieves logical decoupling between the battery and the inverter, and achieves short-term overload of the battery by limiting the maximum allowable discharge current, thereby increasing the possibility of instantaneous successful start-up of the inverter when connected to a high-power load.

[0041] According to one embodiment of this application, the battery management module is further configured to:

[0042] When the battery experiences overload and the overload duration reaches a first preset duration, the maximum allowable discharge current of the battery is adjusted to the set value.

[0043] In the above technical solution, when the battery is overloaded and the overload duration reaches the first preset time, the maximum allowable discharge current of the battery is adjusted to the set value, which can reduce the damage to the battery caused by continuous overload and improve the battery's service life and safety.

[0044] According to one embodiment of this application, the battery management module is further configured to:

[0045] The maximum allowable discharge current of the battery is set based on the current limiting matrix of the battery or the rated current of the battery.

[0046] In the above technical solution, determining the maximum allowable discharge current setting of the battery based on the battery's current limiting matrix or the battery's rated current can reduce battery damage and improve battery life and safety.

[0047] According to one embodiment of this application, the battery satisfies the permissible overload conditions, including: the average cell voltage of the battery is greater than or equal to a first threshold, the state of charge of the battery is greater than or equal to a second threshold, the lowest cell temperature of the battery is greater than or equal to a third threshold, and the highest cell temperature of the battery is less than or equal to a fourth threshold.

[0048] In the above technical solution, by detecting the average cell voltage, state of charge, and cell temperature of the battery, it is determined whether the allowable overload conditions are met. This can reduce the occurrence of over-discharge and overheating of the battery, enabling the battery to achieve short-term overload, increasing the possibility of instantaneous successful start-up of the inverter when connected to a high-power load, and improving the battery's service life and safety.

[0049] According to one embodiment of this application, the battery overload includes: the absolute value of the difference between the real-time current of the battery and the set value of the rated current of the battery or the maximum allowable discharge current is greater than or equal to a fifth threshold.

[0050] In the above technical solution, the absolute value of the difference between the real-time current of the battery and the set value of the rated current or the maximum allowable discharge current of the battery is greater than or equal to the fifth threshold to determine whether the battery is overloaded. This can improve the accuracy and practicality of battery overload judgment, enable the battery to achieve short-term overload, and increase the possibility of instantaneous successful start-up of the inverter when connected to a high-power load.

[0051] According to one embodiment of this application, the battery management module is further configured to:

[0052] When the battery does not meet the permissible overload condition and does not meet the non-permissible overload condition, the maximum permissible discharge current of the battery is controlled to remain unchanged.

[0053] In the above technical solution, when the battery does not meet the allowable overload conditions and does not meet the non-allowable overload conditions, the maximum allowable discharge current of the battery is kept constant, which reduces the fluctuation of the current and can improve the stability of the energy storage system.

[0054] According to one embodiment of this application, the battery management module is further configured to:

[0055] When the battery meets the condition that it is not allowed to overload, the maximum allowable discharge current of the battery is controlled to the set value.

[0056] In the above technical solution, when the battery meets the conditions that do not allow overload, the maximum allowable discharge current of the battery is controlled to a set value, so that the battery works within the normal range, thereby improving the safety and reliability of the battery.

[0057] According to one embodiment of this application, the unacceptable overload condition includes at least one of the following:

[0058] The average cell voltage of the battery is less than or equal to the sixth threshold.

[0059] The state of charge of the battery is less than or equal to the seventh threshold.

[0060] The lowest temperature of the battery cell is less than or equal to the eighth threshold.

[0061] The highest temperature of the battery cell is greater than or equal to the ninth threshold.

[0062] In the above technical solution, by setting the battery overload condition, when the battery meets at least one of the following conditions: the average cell voltage of the battery is less than or equal to the sixth threshold, the state of charge of the battery is less than or equal to the seventh threshold, the minimum cell temperature of the battery is less than or equal to the eighth threshold, and the maximum cell temperature of the battery is greater than or equal to the ninth threshold, the battery is not allowed to be overloaded. This can reduce the occurrence of over-discharge and overheating of the battery, and improve the battery's service life and safety.

[0063] According to one embodiment of this application, the battery management module is further configured to:

[0064] When the interval between the current time of battery overload and the last time of battery overload is less than a second preset time, the maximum allowable discharge current of the battery is set to the preset value.

[0065] In the above technical solution, if the interval between the current time of battery overload and the time of the last time of battery overload is less than the second preset time, the maximum allowable discharge current of the battery is set to a set value, or the maximum allowable discharge current of the battery is prohibited from being increased to the overload value. This can reduce the damage to the battery caused by frequent battery overload and improve the battery's service life and safety.

[0066] According to one embodiment of this application, the overload value is determined based on the cell capacity and overload power requirement.

[0067] In the above technical solution, determining the overload value based on the cell capacity and overload power requirements can improve the stability of the energy storage system.

[0068] According to one embodiment of this application, the energy storage system overload control device further includes: an inverter control module, configured to control the inverter when the battery is overloaded and the overload duration reaches a first preset duration, so that the battery-side current of the inverter does not exceed the set value of the maximum allowable discharge current.

[0069] In the above technical solution, when the battery experiences overload and the overload duration reaches a first preset time, the inverter is controlled to ensure that the battery-side current of the inverter does not exceed the set value of the maximum allowable discharge current. This adds independent protection logic to both the battery and the inverter, providing dual protection for the energy storage system. Even if either the battery or the inverter fails, it will not cause excessive damage to the energy storage system, thus improving the safety and reliability of the energy storage system.

[0070] Thirdly, this application provides an energy storage system, including: a battery and an inverter, wherein the battery supplies power to a load through the inverter, and the energy storage system further includes an energy storage system overload control device as described in the second aspect above.

[0071] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0072] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0073] Figure 1 This is one of the structural schematic diagrams of an energy storage system provided in some embodiments of this application;

[0074] Figure 2 This is one of the flowcharts of an energy storage system overload control method provided in some embodiments of this application;

[0075] Figure 3 This is the second flowchart of an energy storage system overload control method provided in some embodiments of this application;

[0076] Figure 4 This is a schematic diagram of the structure of an energy storage system overload control device provided in some embodiments of this application;

[0077] Figure 5 This is a schematic diagram illustrating the interaction between the battery management module and the inverter control module provided in some embodiments of this application;

[0078] Figure 6 This is a second schematic diagram of the energy storage system provided in some embodiments of this application;

[0079] Figure 7 These are schematic diagrams of the structure of electronic devices provided in some embodiments of this application.

[0080] Explanation of reference numerals in the attached figures:

[0081] 100: Energy storage system; 101: Battery; 102: Inverter;

[0082] 103: Power grid; 104: Load; 401: Battery management module;

[0083] 402: Inverter control module; 40: Energy storage system overload control device; 700: Electronic equipment;

[0084] 701: Processor; 702: Memory. Detailed Implementation

[0085] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0086] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0087] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0088] The energy storage system overload control method provided in this application embodiment can be executed by an electronic device or a functional module or entity in an electronic device that can implement the energy storage system overload control method. The electronic devices mentioned in this application embodiment include, but are not limited to, controllers, processors, edge servers, backend servers, cloud servers, etc. in the energy storage system. The energy storage system overload control method provided in this application embodiment is described below using an electronic device as the execution subject as an example.

[0089] The overload control method, device, and energy storage system provided in this application will be described in detail below with reference to the accompanying drawings and through specific embodiments and application scenarios.

[0090] Figure 1 This is one of the structural schematic diagrams of an energy storage system provided in some embodiments of this application, such as... Figure 1 As shown, the energy storage system 100 includes a battery 101 and an inverter 102. The battery 101 is connected to the load 104 and the power grid 103 through the inverter 102.

[0091] Energy storage system 100 is a household electricity storage device that can be used in conjunction with a solar photovoltaic system. It stores electrical energy to provide power to the household. The inverter 102 of energy storage system 100 converts direct current (DC) to alternating current (AC). The battery 101 of energy storage system 100 is used for charging and discharging. When the voltage of battery 101 cannot directly meet the household's usage requirements, the inverter 102 is used to charge and discharge battery 101, thereby managing the battery's power capacity.

[0092] In related technologies, when the inverter 102 of the energy storage system 100 is connected to the load 104 at the moment of startup, it may require high power support. If the rated power of the battery 101 cannot meet the startup power of the load 104, the load 104 may fail to start. The existing energy storage system 100 has the problem of not being able to support short-term overload and the inverter 102 being prone to startup failure when connected to a high-power load 104, which brings many inconveniences to the actual application of energy storage control.

[0093] Figure 2This is one of the flowcharts illustrating an overload control method for an energy storage system provided in some embodiments of this application. The energy storage system includes a battery and an inverter. The battery supplies power to the load through the inverter, such as... Figure 2 As shown, the overload control method for the energy storage system includes steps 210, 220 and 230.

[0094] It should be noted that the energy storage system overload control method provided in this application embodiment can be implemented by an energy storage system overload control device. The energy storage system overload control device includes a battery management module and an inverter control module. The battery management module communicates with the inverter control module. The battery management module is used to monitor and manage the battery, and the inverter control module is used to control the inverter.

[0095] Step 210: Determine the set value of the maximum allowable discharge current of the battery;

[0096] It is easy to understand that the maximum allowable discharge current of a battery is set to the maximum allowable discharge current when the battery is working normally.

[0097] Step 220: When the battery meets the allowable overload conditions, increase the maximum allowable discharge current of the battery from the set value to the overload value;

[0098] If the battery meets the allowable overload conditions, the battery management module will increase the battery's maximum allowable discharge current from the set value to the overload value.

[0099] Optionally, the permissible overload condition can be that the cell voltage, battery capacity, minimum cell temperature, and maximum cell temperature all meet preset conditions simultaneously, thereby determining that the battery meets the permissible overload condition.

[0100] Step 230: Transmit the maximum allowable discharge current of the battery to the inverter so that the battery-side current of the inverter does not exceed the overload value.

[0101] The transmission of the maximum allowable discharge current of the battery to the inverter can be understood as follows: the battery management module communicates with the inverter's control module in real time, the battery management module transmits the maximum allowable discharge current of the battery to the inverter's control module, and the inverter's control module transmits the maximum allowable discharge current of the battery to the inverter, so that the inverter can obtain the maximum allowable discharge current of the battery.

[0102] It should be noted that during the process of the inverter drawing power from the battery side, it will control the battery side current to not exceed the maximum allowable discharge current transmitted by the battery management module. When the battery is allowed to overload, the maximum allowable discharge current will be increased. At this time, when the load is connected to the inverter load port and the inverter is started, if a large power is required, it can be directly drawn from the battery side without any other additional communication.

[0103] In the above technical solution, by raising the set value of the maximum allowable discharge current of the battery to the overload value when the battery of the energy storage system meets the allowable overload conditions, and transmitting the maximum allowable discharge current of the battery to the inverter, the inverter can control the current during the process of drawing power from the battery side to not exceed the maximum allowable discharge current of the battery without adding additional information interaction about overload. This achieves logical decoupling between the battery and the inverter, and achieves short-term overload of the battery by limiting the maximum allowable discharge current, thereby increasing the possibility of instantaneous successful start-up of the inverter when connected to a high-power load.

[0104] In one embodiment of this application, the method further includes: when the battery is overloaded and the overload duration reaches a first preset duration, adjusting the maximum allowable discharge current of the battery to the set value.

[0105] It is easy to understand that when the battery meets the allowable overload conditions, the battery management module raises the set value of the battery's maximum allowable discharge current to the overload value. In order to prevent the battery from being damaged by continuous overload, the timing starts when the battery is overloaded. When the battery's overload duration reaches the first preset duration, the battery management module adjusts the battery's maximum allowable discharge current to the set value, that is, the duration of a single overload does not exceed the first preset duration.

[0106] For example, the first preset duration is 10 seconds, starting from when the battery becomes overloaded. When the battery overload duration reaches 10 seconds, the battery management module adjusts the battery's maximum allowable discharge current to the battery's set value.

[0107] In the above technical solution, when the battery is overloaded and the overload duration reaches the first preset time, the maximum allowable discharge current of the battery is adjusted to the set value, which can reduce the damage to the battery caused by continuous overload and improve the battery's service life and safety.

[0108] In one embodiment of this application, determining the set value of the maximum permissible discharge current of the battery includes:

[0109] The maximum allowable discharge current of the battery is set based on the current limiting matrix of the battery or the rated current of the battery.

[0110] It is easy to understand that the maximum allowable discharge current setting of the battery can be obtained by looking up the table according to the battery's current limiting matrix. The maximum allowable discharge current setting of the battery indicates the maximum current value that the battery can safely withstand during discharge. Exceeding this value may damage the battery and affect its lifespan and safety.

[0111] It should be noted that in energy storage systems, the current limiting matrix can determine the battery's operating safety and efficiency under different load conditions. The battery's current limiting matrix is ​​a table or chart used to describe the battery's maximum discharge current and charging current under different operating conditions. Based on the current limiting matrix, the battery's safety and performance limitations under various operating states can be determined.

[0112] Optionally, the maximum allowable discharge current of the battery can be set according to the battery's rated current. For example, the maximum allowable discharge current of the battery can be set to the value of the rated current.

[0113] In the above technical solution, determining the maximum allowable discharge current setting of the battery based on the battery's current limiting matrix or the battery's rated current can reduce battery damage and improve battery life and safety.

[0114] In one embodiment of this application, the battery satisfies the permissible overload conditions, including: the average cell voltage of the battery is greater than or equal to a first threshold, the state of charge of the battery is greater than or equal to a second threshold, the lowest cell temperature of the battery is greater than or equal to a third threshold, and the highest cell temperature of the battery is less than or equal to a fourth threshold.

[0115] It is easy to understand that in order to reduce the occurrence of over-discharge and overheating of the battery, the battery must meet the following overload conditions: the average voltage of the corresponding cell is greater than or equal to the first threshold, the state of charge of the battery is greater than or equal to the second threshold, the minimum temperature of the corresponding cell is greater than or equal to the third threshold, and the maximum temperature of the corresponding cell is less than or equal to the fourth threshold.

[0116] It should be noted that a battery includes a battery pack, which consists of multiple cells. The average cell voltage represents the average voltage of all cells, the lowest cell temperature represents the lowest temperature of all cells, and the highest cell temperature represents the highest temperature of all cells.

[0117] For example, the first threshold is 3.1V, the second threshold is 30%, the third threshold is 20 degrees Celsius, and the fourth threshold is 40 degrees Celsius. When the average cell voltage of the battery is greater than or equal to 3.1V, the state of charge of the battery is greater than or equal to 30%, the lowest cell temperature of the battery is greater than or equal to 20 degrees Celsius, and the highest cell temperature of the battery is less than or equal to 40 degrees Celsius, the battery is determined to meet the allowable overload conditions, and the maximum allowable discharge current of the battery is increased from the set value to the overload value.

[0118] It should be noted that the first threshold, the second threshold, the third threshold, and the fourth threshold can be set according to the characteristics of the battery cell or product requirements, and this application embodiment does not impose any restrictions.

[0119] In the above technical solution, by detecting the average cell voltage, state of charge, and cell temperature of the battery, it is determined whether the allowable overload conditions are met. This can reduce the occurrence of over-discharge and overheating of the battery, enabling the battery to achieve short-term overload, increasing the possibility of instantaneous successful start-up of the inverter when connected to a high-power load, and improving the battery's service life and safety.

[0120] In one embodiment of this application, the battery overload includes: the absolute value of the difference between the real-time current of the battery and the set value of the rated current of the battery or the maximum allowable discharge current is greater than or equal to a fifth threshold.

[0121] It should be noted that the battery can determine whether it is overloaded by its own current value. When the absolute value of the difference between the real-time current of the battery and the set value of the rated current or the maximum allowable discharge current of the battery is greater than or equal to the fifth threshold, the battery is determined to be overloaded.

[0122] For example, the rated current of a battery is Cmax. The rated current is the optimal current for the battery under normal operating conditions. Working at this current for a long time can ensure the performance and lifespan of the battery. The fifth threshold is 2A. When the absolute value of the difference between the real-time current of the battery and the rated current of the battery is greater than or equal to 2A, it is determined that the battery is overloaded.

[0123] It is worth noting that the fifth threshold can be set with reference to the current sampling accuracy and current fluctuation, and this application embodiment does not impose any restrictions.

[0124] In the above technical solution, the absolute value of the difference between the real-time current of the battery and the set value of the rated current or the maximum allowable discharge current of the battery is greater than or equal to the fifth threshold to determine whether the battery is overloaded. This can improve the accuracy and practicality of battery overload judgment, enable the battery to achieve short-term overload, and increase the possibility of instantaneous successful start-up of the inverter when connected to a high-power load.

[0125] In one embodiment of this application, the method further includes:

[0126] When the battery does not meet the permissible overload condition and does not meet the non-permissible overload condition, the maximum permissible discharge current of the battery is controlled to remain unchanged.

[0127] It is easy to understand that if the battery does not meet the allowable overload conditions or the non-allowable overload conditions, keeping the maximum allowable discharge current of the battery constant can reduce the fluctuation of the battery.

[0128] In the above technical solution, when the battery does not meet the allowable overload conditions and does not meet the non-allowable overload conditions, the maximum allowable discharge current of the battery is kept constant, which reduces the fluctuation of the current and can improve the stability of the energy storage system.

[0129] In one embodiment of this application, the method further includes:

[0130] When the battery meets the condition that it is not allowed to overload, the maximum allowable discharge current of the battery is controlled to the set value.

[0131] Optionally, when the battery meets the allowable overload conditions, the maximum allowable discharge current of the battery is increased from the set value to the overload value; when the battery does not meet the allowable overload conditions, the maximum allowable discharge current of the battery is reduced from the overload value to the set value.

[0132] Optionally, if the battery consistently meets the overload-prohibited conditions, the maximum allowable discharge current of the battery can be controlled to a set value.

[0133] In the above technical solution, when the battery meets the conditions that do not allow overload, the maximum allowable discharge current of the battery is controlled to a set value, so that the battery works within the normal range, thereby improving the safety and reliability of the battery.

[0134] In one embodiment of this application, the overload-prohibited condition includes at least one of the following:

[0135] The average cell voltage of the battery is less than or equal to the sixth threshold.

[0136] The state of charge of the battery is less than or equal to the seventh threshold.

[0137] The lowest temperature of the battery cell is less than or equal to the eighth threshold.

[0138] The highest temperature of the battery cell is greater than or equal to the ninth threshold.

[0139] It is easy to understand that the conditions under which overload is not allowed include at least one of the following: the average cell voltage of the battery is less than or equal to the sixth threshold; the state of charge of the battery is less than or equal to the seventh threshold; the lowest cell temperature of the battery is less than or equal to the eighth threshold; and the highest cell temperature of the battery is greater than or equal to the ninth threshold.

[0140] For example, the sixth threshold is 3V, the seventh threshold is 19%, the eighth threshold is 19 degrees Celsius, and the ninth threshold is 41 degrees Celsius. When the detected battery meets at least one of the following conditions: the average cell voltage of the battery is less than or equal to 3V, the state of charge of the battery is less than or equal to 29%, the lowest cell temperature of the battery is less than or equal to 19°C, and the highest cell temperature of the battery is greater than or equal to 41°C, the battery is not allowed to be overloaded.

[0141] Figure 3 This is a second schematic flowchart of an energy storage system overload control method provided in some embodiments of this application, such as... Figure 3As shown, MDCV is the maximum allowable discharge current, Coverload is the overload value of the maximum allowable discharge current, SOC is the state of charge of the battery, Tmin is the lowest temperature of the corresponding cell, and Tmax is the highest temperature of the corresponding cell. Taking the first threshold as 3.1V, the second threshold as 30%, the third threshold as 20 degrees Celsius, the fourth threshold as 40 degrees Celsius, the sixth threshold as 3V, the seventh threshold as 29%, the eighth threshold as 19 degrees Celsius, and the ninth threshold as 41 degrees Celsius as an example, when the average cell voltage of the corresponding battery is greater than or equal to 3.1V, the state of charge of the battery is greater than or equal to 30%, the lowest temperature of the corresponding cell Tmin is greater than or equal to 20 degrees Celsius, and the highest temperature of the corresponding cell Tmax is less than or equal to 40 degrees Celsius, it is determined that the battery of the energy storage system meets the allowable overload conditions, and the maximum allowable discharge current of the battery is set as the overload value. At this time, MDCV = Coverload.

[0142] When at least one of the following is detected: the average cell voltage of the battery is less than or equal to 3V, the state of charge (SOC) of the battery is less than or equal to 29%, the minimum cell temperature of the battery is less than or equal to 19°C, or the maximum cell temperature of the battery is equal to or equal to 41°C, the battery is not allowed to be overloaded. In this case, the maximum allowable discharge current setting value of the battery is determined according to the battery's current limiting matrix or the battery's rated current.

[0143] When a battery is detected to not meet at least one of the following conditions: the average cell voltage is less than or equal to 3V, the state of charge (SOC) is less than or equal to 29%, the minimum cell temperature is less than or equal to 19°C, or the maximum cell temperature is greater than or equal to 41°C, the MDCV state is kept unchanged, thereby reducing the fluctuation of the maximum allowable discharge current.

[0144] In the above technical solution, by setting the battery overload condition, when the battery meets at least one of the following conditions: the average cell voltage of the battery is less than or equal to the sixth threshold, the state of charge of the battery is less than or equal to the seventh threshold, the minimum cell temperature of the battery is less than or equal to the eighth threshold, and the maximum cell temperature of the battery is greater than or equal to the ninth threshold, the battery is not allowed to be overloaded. This can reduce the occurrence of over-discharge and overheating of the battery, and improve the battery's service life and safety.

[0145] In one embodiment of this application, the method further includes:

[0146] When the interval between the current time of battery overload and the last time of battery overload is less than a second preset time, the maximum allowable discharge current of the battery is set to the preset value.

[0147] It is easy to understand that frequent battery overload can affect battery performance and reduce battery life. If the interval between the current overload and the last overload is less than the second preset time, the battery is not allowed to be overloaded, and the maximum allowable discharge current of the battery is set to the set value.

[0148] If the time interval between the current time of battery overload and the time of the last time of overload is greater than or equal to the second preset time, battery overload is allowed, and the energy storage system increases the battery's maximum allowable discharge current from the set value to the overload value.

[0149] For example, the second preset duration is 30 minutes. If the interval between the current time of battery overload and the last time of battery overload is less than 30 minutes, battery overload is not allowed, and the maximum allowable discharge current of the battery is set to the set value.

[0150] In the above technical solution, when the interval between the current time of battery overload and the last time of battery overload is less than the second preset time, setting the maximum allowable discharge current of the battery to a set value can reduce the damage to the battery caused by frequent battery overload and improve the battery's service life and safety.

[0151] In one embodiment of this application, the overload value is determined based on the cell capacity and overload power requirement.

[0152] It is easy to understand that the overload value of the battery's maximum allowable discharge current can be determined based on the cell's capacity and overload power requirements.

[0153] In the above technical solution, determining the overload value based on the cell capacity and overload power requirements can improve the stability of the energy storage system.

[0154] In one embodiment of this application, the method further includes:

[0155] When the battery is overloaded and the overload duration reaches a first preset duration, the inverter is controlled to ensure that the battery-side current of the inverter does not exceed the set value of the maximum allowable discharge current.

[0156] It's easy to understand that the inverter's control module communicates with the battery management module in real time during operation, obtaining the battery's maximum allowable discharge current from the battery management module. Furthermore, during the inverter's power intake from the battery, the control module ensures that the battery-side current does not exceed the maximum allowable discharge current transmitted by the battery management module. When the battery is allowed to overload, the maximum allowable discharge current increases from the set value to the overload value. Therefore, if a high power is needed at the moment of inverter startup with a load connected to the load port, it can be directly drawn from the battery without any additional communication.

[0157] To prevent damage to the inverter from prolonged high current, the inverter's control module obtains the time when the battery is overloaded from the energy storage system's battery management module. When the overload duration reaches the first preset duration, the control module controls the inverter to ensure that the inverter's battery-side current does not exceed the set value of the maximum allowable discharge current.

[0158] For example, if the first preset duration is 10 seconds, when the battery overload duration is detected to reach 10 seconds, even if the battery is allowed to overload, the inverter controls the battery current to not exceed the set value of the maximum allowable discharge current, thereby realizing overload protection logic on the inverter side.

[0159] In the above technical solution, when the battery is overloaded and the overload duration reaches a first preset time, the inverter is controlled so that the battery side current of the inverter does not exceed the set value of the maximum allowable discharge current. This adds protection logic and overload protection logic to the battery and the inverter respectively, and they are independent of each other, thus achieving dual protection for the energy storage system. Even if one of the battery or the inverter fails, it will not cause excessive damage to the energy storage system, thereby improving the safety and reliability of the energy storage system.

[0160] Figure 4 This is a schematic diagram of the structure of an overload control device for an energy storage system provided in some embodiments of this application. The energy storage system 100 includes a battery 101 and an inverter 102. The battery 101 supplies power to the load 104 through the inverter 102, such as... Figure 4 As shown, the energy storage system overload control device 40 includes: a battery management module 401,

[0161] The battery management module 401 is used to determine the set value of the maximum allowable discharge current of the battery; when the battery meets the allowable overload conditions, the maximum allowable discharge current of the battery is increased from the set value to the overload value; and the maximum allowable discharge current of the battery is transmitted to the inverter so that the battery-side current of the inverter does not exceed the overload value.

[0162] In the above technical solution, by raising the set value of the maximum allowable discharge current of the battery to the overload value when the battery of the energy storage system meets the allowable overload conditions, and transmitting the maximum allowable discharge current of the battery to the inverter, the inverter can control the current during the process of drawing power from the battery side to not exceed the maximum allowable discharge current of the battery without adding additional information interaction about overload. This achieves logical decoupling between the battery and the inverter, and achieves short-term overload of the battery by limiting the maximum allowable discharge current, thereby increasing the possibility of instantaneous successful start-up of the inverter when connected to a high-power load.

[0163] In one embodiment of this application, the battery management module is further configured to:

[0164] When the battery experiences overload and the overload duration reaches a first preset duration, the maximum allowable discharge current of the battery is adjusted to the set value.

[0165] In the above technical solution, when the battery is overloaded and the overload duration reaches the first preset time, the maximum allowable discharge current of the battery is adjusted to the set value, which can reduce the damage to the battery caused by continuous overload and improve the battery's service life and safety.

[0166] In one embodiment of this application, the battery management module is further configured to:

[0167] The maximum allowable discharge current of the battery is set based on the current limiting matrix of the battery or the rated current of the battery.

[0168] In the above technical solution, determining the maximum allowable discharge current setting of the battery based on the battery's current limiting matrix or the battery's rated current can reduce battery damage and improve battery life and safety.

[0169] In one embodiment of this application, the battery satisfies the permissible overload conditions, including: the average cell voltage of the battery is greater than or equal to a first threshold, the state of charge of the battery is greater than or equal to a second threshold, the lowest cell temperature of the battery is greater than or equal to a third threshold, and the highest cell temperature of the battery is less than or equal to a fourth threshold.

[0170] In the above technical solution, by detecting the average cell voltage, state of charge, and cell temperature of the battery, it is determined whether the allowable overload conditions are met. This can reduce the occurrence of over-discharge and overheating of the battery, enabling the battery to achieve short-term overload, increasing the possibility of instantaneous successful start-up of the inverter when connected to a high-power load, and improving the battery's service life and safety.

[0171] In one embodiment of this application, the battery overload includes: the absolute value of the difference between the real-time current of the battery and the set value of the rated current of the battery or the maximum allowable discharge current is greater than or equal to a fifth threshold.

[0172] In the above technical solution, the absolute value of the difference between the real-time current of the battery and the set value of the rated current or the maximum allowable discharge current of the battery is greater than or equal to the fifth threshold to determine whether the battery is overloaded. This can improve the accuracy and practicality of battery overload judgment, enable the battery to achieve short-term overload, and increase the possibility of instantaneous successful start-up of the inverter when connected to a high-power load.

[0173] In one embodiment of this application, the battery management module is further configured to:

[0174] When the battery does not meet the permissible overload condition and does not meet the non-permissible overload condition, the maximum permissible discharge current of the battery is controlled to remain unchanged.

[0175] In the above technical solution, when the battery does not meet the allowable overload conditions and does not meet the non-allowable overload conditions, the maximum allowable discharge current of the battery is kept constant, which reduces the fluctuation of the current and can improve the stability of the energy storage system.

[0176] In one embodiment of this application, the battery management module is further configured to:

[0177] When the battery meets the condition that it is not allowed to overload, the maximum allowable discharge current of the battery is controlled to the set value.

[0178] In the above technical solution, when the battery meets the conditions that do not allow overload, the maximum allowable discharge current of the battery is controlled to a set value, so that the battery works within the normal range, thereby improving the safety and reliability of the battery.

[0179] In one embodiment of this application, the overload-prohibited condition includes at least one of the following:

[0180] The average cell voltage of the battery is less than or equal to the sixth threshold.

[0181] The state of charge of the battery is less than or equal to the seventh threshold.

[0182] The lowest temperature of the battery cell is less than or equal to the eighth threshold.

[0183] The highest temperature of the battery cell is greater than or equal to the ninth threshold.

[0184] In the above technical solution, by setting the battery overload condition, when the battery meets at least one of the following conditions: the average cell voltage of the battery is less than or equal to the sixth threshold, the state of charge of the battery is less than or equal to the seventh threshold, the minimum cell temperature of the battery is less than or equal to the eighth threshold, and the maximum cell temperature of the battery is greater than or equal to the ninth threshold, the battery is not allowed to be overloaded. This can reduce the occurrence of over-discharge and overheating of the battery, and improve the battery's service life and safety.

[0185] In one embodiment of this application, the battery management module is further configured to:

[0186] When the interval between the current time of battery overload and the time of the last time of overload is less than a second preset time, the maximum allowable discharge current of the battery is set to the set value, or the maximum allowable discharge current of the battery is prohibited from being increased to the overload value.

[0187] In the above technical solution, if the interval between the current time of battery overload and the time of the last time of battery overload is less than the second preset time, the maximum allowable discharge current of the battery is set to a set value, or the maximum allowable discharge current of the battery is prohibited from being increased to the overload value. This can reduce the damage to the battery caused by frequent battery overload and improve the battery's service life and safety.

[0188] In one embodiment of this application, the overload value is determined based on the cell capacity and overload power requirement.

[0189] In the above technical solution, determining the overload value based on the cell capacity and overload power requirements can improve the stability of the energy storage system.

[0190] In one embodiment of this application, the energy storage system overload control device further includes: an inverter control module, configured to control the inverter when the battery is overloaded and the overload duration reaches a first preset duration, so that the battery-side current of the inverter does not exceed the set value of the maximum allowable discharge current.

[0191] When the battery is overloaded and the overload duration reaches a first preset duration, the inverter is controlled to ensure that the battery-side current of the inverter does not exceed the set value of the maximum allowable discharge current.

[0192] Figure 5 This is a schematic diagram illustrating the interaction between the battery management module and the control module provided in some embodiments of this application, such as... Figure 5 As shown, the battery management module 401 is connected to the inverter control module 402, and the battery management module 401 transmits the maximum allowable discharge current of the battery to the inverter control module 402 in real time.

[0193] When the battery meets the allowable overload conditions, the battery management module 401 increases the maximum allowable discharge current of the battery from the set value to the overload value, and transmits the maximum allowable discharge current of the battery to the control module 402 of the inverter. The control module 402 of the inverter controls the inverter so that the battery side current of the inverter does not exceed the overload value.

[0194] When the battery is overloaded and the overload duration reaches a first preset duration, the battery management module 401 adjusts the maximum allowable discharge current of the battery to the set value and transmits the maximum allowable discharge current of the battery to the inverter control module 402. The inverter control module 402 controls the inverter so that the battery side current of the inverter does not exceed the set value.

[0195] In the above technical solution, when the battery experiences overload and the overload duration reaches a first preset time, the inverter is controlled to ensure that the battery-side current of the inverter does not exceed the set value of the maximum allowable discharge current. This adds independent protection logic to both the battery and the inverter, providing dual protection for the energy storage system. Even if either the battery or the inverter fails, it will not cause excessive damage to the energy storage system, thus improving the safety and reliability of the energy storage system.

[0196] The energy storage system overload control device 40 in this application embodiment can be an electronic device or a component within an electronic device, such as an integrated circuit or a chip. The electronic device can be a terminal or other devices besides a terminal. For example, the electronic device can be a mobile phone, tablet computer, laptop computer, PDA, in-vehicle electronic device, mobile internet device (MID), augmented reality (AR) / virtual reality (VR) device, robot, wearable device, ultra-mobile personal computer (UMPC), netbook, or personal digital assistant (PDA), etc. It can also be a server, network attached storage (NAS), personal computer (PC), television set, etc., and this application embodiment does not specifically limit the scope.

[0197] The energy storage system overload control device 40 in this embodiment can be a device with an operating system. This operating system can be a Microsoft (Windows) operating system, an Android operating system, an iOS operating system, or other possible operating systems; this embodiment does not specifically limit the specific operating system.

[0198] The energy storage system overload control device 40 provided in this application embodiment can achieve... Figures 1 to 3 The various processes implemented in the method implementation examples will not be described again here to avoid repetition.

[0199] Figure 6 This is a second schematic diagram of the energy storage system provided in some embodiments of this application, such as... Figure 6 As shown, the energy storage system 100 includes a battery 101 and an inverter 102. The battery 101 supplies power to the load through the inverter 102. The energy storage system 100 also includes the energy storage system overload control device 40 described in the aforementioned embodiments.

[0200] Optional, see reference Figure 6 The energy storage system overload control device 40 is composed of a battery management module 401 as described in the previous embodiment and an inverter control module 402 as described in the previous embodiment. The battery management module 401 can be housed in the battery 101, and the inverter control module 402 can be housed in the inverter 102. It should be noted that this application does not limit the relationship between the battery management module 401 and the battery, or the relationship between the inverter control module 402 and the inverter 102.

[0201] The energy storage system provided in this application embodiment can achieve the same technical effect as the aforementioned energy storage system overload control method embodiment or the aforementioned energy storage system overload control device embodiment. To avoid repetition, it will not be described again here.

[0202] In some embodiments, such as Figure 7 As shown, this application embodiment also provides an electronic device 700, including a processor 701, a memory 702, and a computer program stored in the memory 702 and executable on the processor 701. When the program is executed by the processor 701, it implements the various processes of the above-described energy storage system overload control method embodiment and can achieve the same technical effect. To avoid repetition, it will not be described again here.

[0203] It should be noted that the electronic devices in the embodiments of this application include the mobile electronic devices and non-mobile electronic devices described above.

[0204] This application also provides a non-transitory computer-readable storage medium storing a computer program. When the computer program is executed by a processor, it implements the various processes of the above-described energy storage system overload control method embodiments and achieves the same technical effect. To avoid repetition, it will not be described again here.

[0205] The processor is the processor in the electronic device described in the above embodiments. The readable storage medium includes computer-readable storage media, such as computer read-only memory (ROM), random access memory (RAM), magnetic disk, or optical disk.

[0206] This application also provides a computer program product, including a computer program that, when executed by a processor, implements the above-described energy storage system overload control method.

[0207] The processor is the processor in the electronic device described in the above embodiments. The readable storage medium includes computer-readable storage media, such as computer read-only memory (ROM), random access memory (RAM), magnetic disk, or optical disk.

[0208] This application embodiment also provides a chip, which includes a processor and a communication interface. The communication interface is coupled to the processor. The processor is used to run programs or instructions to implement the various processes of the above-described energy storage system overload control method embodiment, and can achieve the same technical effect. To avoid repetition, it will not be described again here.

[0209] It should be understood that the chip mentioned in the embodiments of this application may also be referred to as a system-on-a-chip, system chip, chip system, or system-on-a-chip, etc.

[0210] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, it should be noted that the scope of the methods and apparatuses in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

[0211] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, can be embodied in the form of a computer software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) and includes several instructions to cause a terminal (which may be a mobile phone, computer, server, or network device, etc.) to execute the methods described in the various embodiments of this application.

[0212] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

[0213] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0214] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. An overload control method for an energy storage system, characterized in that, The energy storage system includes a battery and an inverter, wherein the battery supplies power to a load via the inverter, and the method includes: Determine the set value of the maximum allowable discharge current of the battery; When the battery meets the allowable overload conditions, the maximum allowable discharge current of the battery is increased from the set value to the overload value; The maximum permissible discharge current of the battery is transmitted to the inverter so that the battery-side current of the inverter does not exceed the overload value.

2. The overload control method for an energy storage system according to claim 1, characterized in that, The method further includes: when the battery is overloaded and the overload duration reaches a first preset duration, adjusting the maximum allowable discharge current of the battery to the set value.

3. The overload control method for an energy storage system according to claim 1, characterized in that, Determining the set value of the maximum permissible discharge current of the battery includes: The maximum allowable discharge current of the battery is set based on the current limiting matrix of the battery or the rated current of the battery.

4. The overload control method for an energy storage system according to claim 1, characterized in that, The battery meets the permissible overload conditions, including: the average cell voltage of the battery is greater than or equal to a first threshold, the state of charge of the battery is greater than or equal to a second threshold, the lowest cell temperature of the battery is greater than or equal to a third threshold, and the highest cell temperature of the battery is less than or equal to a fourth threshold.

5. The overload control method for an energy storage system according to claim 2, characterized in that, The battery overload includes situations where the absolute value of the difference between the real-time current of the battery and the rated current of the battery or the set value of the maximum allowable discharge current is greater than or equal to a fifth threshold.

6. The overload control method for an energy storage system according to claim 1, characterized in that, The method further includes: When the battery does not meet the permissible overload condition and does not meet the non-permissible overload condition, the maximum permissible discharge current of the battery is controlled to remain unchanged.

7. The overload control method for an energy storage system according to claim 6, characterized in that, The method further includes: When the battery meets the overload condition, the maximum allowable discharge current of the battery is controlled to the set value.

8. The overload control method for an energy storage system according to claim 7, characterized in that, The conditions under which overload is not permitted include at least one of the following: The average cell voltage of the battery is less than or equal to the sixth threshold. The state of charge of the battery is less than or equal to the seventh threshold. The lowest temperature of the battery cell is less than or equal to the eighth threshold. The highest temperature of the battery cell is greater than or equal to the ninth threshold.

9. The overload control method for an energy storage system according to any one of claims 1-8, characterized in that, The method further includes: When the interval between the current time of battery overload and the last time of battery overload is less than a second preset time, the maximum allowable discharge current of the battery is set to the preset value.

10. The overload control method for an energy storage system according to any one of claims 1-8, characterized in that, The overload value is determined based on the cell capacity and overload power requirements.

11. The overload control method for an energy storage system according to claim 2, characterized in that, The method further includes: When the battery is overloaded and the overload duration reaches a first preset duration, the inverter is controlled to ensure that the battery-side current of the inverter does not exceed the set value of the maximum allowable discharge current.

12. An overload control device for an energy storage system, characterized in that, The energy storage system includes a battery and an inverter, the battery supplies power to the load through the inverter, and the energy storage system overload control device includes: The battery management module is used to determine a set value for the maximum allowable discharge current of the battery; when the battery meets the allowable overload conditions, the maximum allowable discharge current of the battery is increased from the set value to the overload value; and the maximum allowable discharge current of the battery is transmitted to the inverter so that the battery-side current of the inverter does not exceed the overload value.

13. The energy storage system overload control device according to claim 12, characterized in that, The battery management module is also used for: When the battery experiences overload and the overload duration reaches a first preset duration, the maximum allowable discharge current of the battery is adjusted to the set value.

14. The energy storage system overload control device according to claim 12, characterized in that, The battery management module is also used for: The maximum allowable discharge current of the battery is set based on the current limiting matrix of the battery or the rated current of the battery.

15. The energy storage system overload control device according to claim 12, characterized in that, The battery meets the permissible overload conditions, including: the average cell voltage of the battery is greater than or equal to a first threshold, the state of charge of the battery is greater than or equal to a second threshold, the lowest cell temperature of the battery is greater than or equal to a third threshold, and the highest cell temperature of the battery is less than or equal to a fourth threshold.

16. The energy storage system overload control device according to claim 13, characterized in that, The battery overload includes situations where the absolute value of the difference between the real-time current of the battery and the rated current of the battery or the set value of the maximum allowable discharge current is greater than or equal to a fifth threshold.

17. The energy storage system overload control device according to claim 12, characterized in that, The battery management module is also used for: When the battery does not meet the permissible overload condition and does not meet the non-permissible overload condition, the maximum permissible discharge current of the battery is controlled to remain unchanged.

18. The energy storage system overload control device according to claim 17, characterized in that, The battery management module is also used for: When the battery meets the condition that it is not allowed to overload, the maximum allowable discharge current of the battery is controlled to the set value.

19. The energy storage system overload control device according to claim 18, characterized in that, The conditions under which overload is not permitted include at least one of the following: The average cell voltage of the battery is less than or equal to the sixth threshold. The state of charge of the battery is less than or equal to the seventh threshold. The lowest temperature of the battery cell is less than or equal to the eighth threshold. The highest temperature of the battery cell is greater than or equal to the ninth threshold.

20. The energy storage system overload control device according to any one of claims 12-19, characterized in that, The battery management module is also used for: When the interval between the current time of battery overload and the last time of battery overload is less than a second preset time, the maximum allowable discharge current of the battery is set to the preset value.

21. The energy storage system overload control device according to any one of claims 12-19, characterized in that, The overload value is determined based on the cell capacity and overload power requirements.

22. The energy storage system overload control device according to claim 13, characterized in that, The energy storage system overload control device further includes: an inverter control module, used to control the inverter when the battery is overloaded and the overload duration reaches a first preset time, so that the battery-side current of the inverter does not exceed the set value of the maximum allowable discharge current.

23. An energy storage system, characterized in that, include: The energy storage system includes a battery and an inverter, wherein the battery supplies power to a load via the inverter, and the energy storage system further includes an energy storage system overload control device as claimed in any one of claims 12-22.

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