SOH detection methods and devices, energy storage systems

Abstract

This disclosure provides a method and apparatus for detecting State of Harm (SOH) and an energy storage system. The main controller in this method can adjust the output power of the power generation module according to the allowable charging and discharging power of the battery pack, so that the output power of the power generation module can charge and discharge the battery pack while meeting the system's power requirements. This allows the battery pack to complete a full charge or discharge cycle, thereby obtaining the current accurate usable capacity of the battery pack and achieving precise calculation of SOH.

Description

Technical Field

[0001] This application relates to the field of batteries, specifically to a method and apparatus for detecting SOH and an energy storage system. Background Technology

[0002] Energy storage systems typically require battery packs to store excess electricity. However, these battery packs age over time, resulting in reduced usable capacity and consequently, a decline in their state of health (SOH). To ensure the safe and stable operation of the energy storage system, it is necessary to monitor the SOH values ​​of the battery packs.

[0003] However, the SOH detection schemes in related technologies have the problem of detection error and low detection accuracy. Summary of the Invention

[0004] In view of the above problems, this application provides a method and apparatus for SOH detection and an energy storage system, which can solve the problem of low SOH detection accuracy in related technologies.

[0005] In a first aspect, this application provides a method for detecting SOH (State of Health) applied to the main controller of an energy storage system, the method comprising:

[0006] Send a SOH detection command to the battery manager of the battery pack in the energy storage system. The SOH detection command is used to instruct the battery manager to determine the charge and discharge allowable power of the battery pack.

[0007] It receives the allowable charge and discharge power sent by the battery manager and adjusts the output power of the power generation module in the energy storage system according to the allowable charge and discharge power, so that the output power of the power generation module can charge and discharge the battery pack while meeting the system's power requirements.

[0008] Receive the SOH value of the battery pack sent by the battery manager, where the SOH value of the battery pack is determined after the battery pack has been charged and discharged.

[0009] This disclosure provides a State of Health (SOH) detection method. In this method, the main controller adjusts the output power of the power generation module based on the battery pack's allowable charge / discharge power, ensuring that the power generation module's output power meets the system's power requirements while charging and discharging the battery pack. This allows the battery pack to complete a full charge or discharge cycle, thereby obtaining the battery pack's accurate current usable capacity and enabling precise calculation of SOH.

[0010] In some embodiments, adjusting the output power of the power generation module in the energy storage system according to the allowable charge and discharge power includes:

[0011] The first charging power of the battery pack, determined according to the allowable charging and discharging power, is sent to the battery manager to instruct the battery manager to control the battery pack to charge according to the first charging power, wherein the first charging power is equal to the difference between the output power of the power generation module and the system demand power;

[0012] Upon receiving the first charging stop request from the battery manager, the generator module is controlled to stop charging the battery pack.

[0013] The first discharge power of the battery pack, determined based on the allowable charge and discharge power, is sent to the battery manager to instruct the battery manager to control the battery pack to discharge according to the first discharge power. The first discharge power is equal to the difference between the system demand power and the output power of the power generation module.

[0014] Upon receiving the first discharge stop request from the battery manager, the system controls the battery pack to stop discharging.

[0015] The output power of the power generation module in the energy storage system is adjusted according to the allowable charging and discharging power, so that the output power of the power generation module can meet the system's power requirements while charging and discharging the battery pack once.

[0016] In some embodiments, adjusting the output power of the power generation module in the energy storage system according to the allowable charge and discharge power further includes:

[0017] After the power generation module stops charging the battery pack, the output power of the power generation module is equal to the system's power demand, allowing the battery pack to rest. This eliminates the polarization phenomenon caused by battery pack charging, thus obtaining the accurate current usable capacity of the battery pack.

[0018] In some embodiments, adjusting the output power of the power generation module in the energy storage system according to the allowable charge and discharge power further includes:

[0019] After the battery pack stops discharging, the output power of the power generation module is equal to the system's power demand, allowing the battery pack to rest. This eliminates the polarization caused by battery pack discharge, thus obtaining the accurate current usable capacity of the battery pack.

[0020] In some embodiments, adjusting the output power of the power generation module in the energy storage system according to the allowable charge and discharge power includes:

[0021] The second discharge power of the battery pack, determined based on the allowable charge and discharge power, is sent to the battery manager to instruct the battery manager to control the battery pack to discharge according to the second discharge power, wherein the second discharge power is equal to the difference between the system demand power and the output power of the power generation module;

[0022] Upon receiving a second discharge stop request from the battery manager, control the battery pack to stop discharging;

[0023] The second charging power of the battery pack, determined based on the allowable charging and discharging power, is sent to the battery manager to instruct the battery manager to control the battery pack to charge according to the second charging power, wherein the second charging power is equal to the difference between the output power of the power generation module and the system demand power;

[0024] Upon receiving a second charging stop request from the battery manager, the control unit stops charging the battery pack.

[0025] The output power of the power generation module in the energy storage system is adjusted according to the allowable charging and discharging power, so that the output power of the power generation module can meet the system's power requirements while discharging and then charging the battery pack.

[0026] In some embodiments, adjusting the output power of the power generation module in the energy storage system according to the allowable charge and discharge power further includes:

[0027] After the battery pack stops discharging, the output power of the power generation module is equal to the system's power demand, allowing the battery pack to rest. This eliminates the polarization caused by battery pack discharge, thus obtaining the accurate current usable capacity of the battery pack.

[0028] In some embodiments, adjusting the output power of the power generation module in the energy storage system according to the allowable charge and discharge power further includes:

[0029] After the power generation module stops charging the battery pack, the output power of the power generation module is equal to the system's power demand, allowing the battery pack to rest. This eliminates the polarization phenomenon caused by battery pack charging, thus obtaining the accurate current usable capacity of the battery pack.

[0030] In some embodiments, sending an SOH detection command to the battery manager of the battery pack in the energy storage system includes:

[0031] When the output power of the power generation module exceeds the system's required power and the duration is greater than or equal to the preset SOH detection time, an SOH detection command is sent to the battery manager of the battery pack in the energy storage system. This enables automatic SOH detection.

[0032] Secondly, a State of Health (SOH) detection method is provided, applied to the battery manager of a battery pack in an energy storage system. The method includes:

[0033] In response to the SOH detection command sent by the main controller of the energy storage system, the allowable charging and discharging power of the battery pack is determined;

[0034] The allowable charging and discharging power is sent to the main controller, so that the main controller can adjust the output power of the power generation module in the energy storage system according to the allowable charging and discharging power, thereby enabling the output power of the power generation module to charge and discharge the battery pack while meeting the system's power requirements.

[0035] After the battery pack has been charged and discharged, determine the available capacity of the battery pack and calculate the SOH value of the battery pack based on the available capacity.

[0036] This disclosure provides a State of Health (SOH) detection method. In this method, after the battery manager sends the allowable charge / discharge power to the main controller, it can instruct the main controller to adjust the output power of the power generation module based on this allowable power. This ensures that the output power of the power generation module meets the system's power requirements while charging and discharging the battery pack, thereby enabling the battery pack to complete a full charge or discharge cycle. Consequently, the battery manager can obtain the accurate current usable capacity of the battery pack, achieving precise calculation of the SOH value.

[0037] In some embodiments, charging and discharging the battery pack includes:

[0038] The battery pack is charged according to the first charging power sent by the main controller, wherein the first charging power is equal to the difference between the output power of the power generation module and the power required by the system.

[0039] After confirming that the battery pack is fully charged, a first charging stop request is sent to the main controller, instructing the main controller to control the power generation module to stop charging the battery pack;

[0040] The battery pack is controlled to discharge according to the first discharge power sent by the main controller, wherein the first discharge power is equal to the difference between the system's required power and the output power of the power generation module;

[0041] After determining that the battery pack is fully discharged, a first discharge stop request is sent to the main controller, instructing the main controller to control the battery pack to stop discharging.

[0042] In some embodiments, the first charging stop request is further used to instruct the main controller, after controlling the power generation module to stop charging the battery pack, to control the output power of the power generation module to be equal to the system demand power, so as to allow the battery pack to rest.

[0043] In some embodiments, the first discharge stop request is further used to instruct the main controller to control the output power of the power generation module to be equal to the system demand power after controlling the battery pack to stop discharging, so as to allow the battery pack to rest.

[0044] In some embodiments, charging and discharging the battery pack includes:

[0045] The battery pack is controlled to discharge according to the second discharge power sent by the main controller;

[0046] After determining that the battery pack is fully discharged, a second discharge stop request is sent to the main controller, instructing the main controller to control the battery pack to stop discharging;

[0047] The battery pack is charged according to the second charging power sent by the main controller;

[0048] After confirming that the battery pack is fully charged, a second charging stop request is sent to the main controller, instructing the main controller to control the power generation module to stop charging the battery pack.

[0049] In some embodiments, the second charging stop request is further used to instruct the main controller, after controlling the power generation module to stop charging the battery pack, to control the output power of the power generation module to be equal to the system demand power, so as to allow the battery pack to rest.

[0050] In some embodiments, the second discharge stop request is further used to instruct the main controller to control the output power of the power generation module to be equal to the system demand power after controlling the battery pack to stop discharging, so as to allow the battery pack to rest.

[0051] In some embodiments, the SOH detection command is sent by the main controller when it determines that the output power of the power generation module is greater than the system demand power and the duration is greater than or equal to a preset SOH detection duration.

[0052] Thirdly, a computer-readable storage medium is provided, on which a computer program is stored, and when the computer program is executed by a computer device, the computer device performs the SOH detection method described above.

[0053] Fourthly, a main controller for an energy storage system is provided, including a memory and a processor. The memory stores a computer program, and when the computer program is executed by the processor, the main controller enables the SOH detection method described above.

[0054] Fifthly, a battery manager for a battery pack in an energy storage system is provided, including a memory and a processor. The memory stores a computer program, and when the computer program is executed by the processor, the battery manager implements the SOH detection method described above.

[0055] Sixthly, an energy storage system is provided, including a power generation module, an energy conversion module, a battery pack, and a main controller. The energy conversion module is used to convert the electrical energy generated by the power generation module to charge the battery pack and / or supply power to external systems, or to convert the electrical energy supplied by the battery pack to supply power to external systems.

[0056] The main controller is used to send SOH detection commands to the battery manager in the battery pack;

[0057] The battery manager is used to determine the allowable charge and discharge power of the battery pack when it receives the SOH detection command, and send the allowable charge and discharge power to the main controller;

[0058] The main controller is also used to adjust the output power of the power generation module according to the allowable charging and discharging power, so that the output power of the power generation module meets the system power requirements for external power supply and the charging and discharging power for charging and discharging the battery pack when it is converted by the energy conversion module.

[0059] The battery manager is also used to determine the available capacity of the battery pack after the battery pack has been charged and discharged, calculate the SOH value of the battery pack based on the available capacity, and send the SOH value of the battery pack to the main controller.

[0060] Additional aspects and advantages of this disclosure 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 disclosure. Attached Figure Description

[0061] Figure 1 This is a schematic diagram of the structure of an energy storage system provided in an embodiment of this disclosure;

[0062] Figure 2 This is a flowchart of an SOH detection method provided in an embodiment of this disclosure;

[0063] Figure 3 This is a flowchart of another SOH detection method provided in this embodiment of the disclosure;

[0064] Figure 4 This is a flowchart of another SOH detection method provided in the embodiments of this disclosure;

[0065] Figure 5 This is a flowchart of another SOH detection method provided in the embodiments of this disclosure;

[0066] Figure 6 This is a schematic diagram of the structure of a main controller provided in an embodiment of this disclosure;

[0067] Figure 7 This is a schematic diagram of the structure of a battery manager provided in an embodiment of this disclosure;

[0068] Figure 8 This is a block diagram of an SOH detection device provided in an embodiment of this disclosure;

[0069] Figure 9 This is a block diagram of another SOH detection device provided in an embodiment of this disclosure;

[0070] Figure 10 This is a block diagram of another SOH detection device provided in the embodiments of this disclosure. Detailed Implementation

[0071] Embodiments of this disclosure are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this disclosure, and should not be construed as limiting this disclosure.

[0072] Currently, energy storage systems typically require battery packs, often lithium-ion batteries, to store excess electricity. These battery packs are generally required to have a lifespan of 20 to 25 years. However, after prolonged use, these battery packs age, resulting in reduced usable capacity and consequently, a decline in their overall health. To ensure the safe and stable operation of the energy storage system, it is necessary to monitor the state of equilibrium (SOH) value of the battery packs.

[0073] In related technologies, State of Charge (SOH) detection is typically performed during battery pack use. Specifically, when the battery pack is in a low-current or quiescent state, the open circuit voltage (OCV) of the cells in the battery pack is obtained by looking up a table, and the SOC value corresponding to the open circuit voltage of the cell is obtained according to a pre-calibrated OCV-state of charge (SOC) value relationship curve. Then, the accumulated charging or discharging capacity during this period is calculated based on the obtained SOC value, and the actual usable capacity of the battery pack is estimated based on the charging or discharging capacity. Finally, the SOH value is determined based on the actual usable capacity.

[0074] However, after long-term use, the OCV-SOC relationship curve changes as the battery pack ages. Therefore, the SOC value determined based on this curve differs from the actual SOC value, resulting in lower accuracy of the determined SOC value and consequently, lower accuracy of the determined SOH value. Furthermore, charging and discharging with the same current poses an overcurrent risk. Additionally, since SOH detection requires the battery pack to be in a low-current or quiescent state, and the charging and discharging current of the battery pack is controlled according to its operating conditions, this cannot fully meet the requirements for SOH detection.

[0075] This disclosure provides a State of Health (SOH) detection method. The main controller in this method can allocate energy based on the output power of the power generation module, the allowable charging and discharging power of the battery pack, and the system's power requirements. This ensures that the output power of the power generation module meets the system's power requirements while simultaneously charging and discharging the battery pack, allowing the battery pack to complete a full charge or discharge cycle. This results in an accurate determination of the battery pack's current usable capacity and precise calculation of the SOH value. This solution addresses the issue of reduced SOH detection accuracy caused by aging OCV-SOC relationship curves.

[0076] Figure 1 This is a schematic diagram of the structure of an energy storage system provided in an embodiment of this disclosure, as shown below. Figure 1 As shown, the energy storage system may include a power generation module 10, an energy conversion module 20, a battery pack 30, and a main controller 40.

[0077] Optionally, the power generation module 10 may include a photovoltaic power generation module, a wind power generation module, a hydropower generation module, or a thermal power generation module, etc. For example, the power generation module 10 may include a photovoltaic power generation module, which may include photovoltaic modules and a photovoltaic inverter with a maximum power point tracking (MPPT) unit. The photovoltaic modules are used to convert solar energy into electrical energy. The photovoltaic inverter is used to monitor the voltage generated by the photovoltaic modules and track the highest voltage and current values ​​to transfer maximum power to the energy conversion module 20.

[0078] The energy conversion module 20 is connected to both the power generation module 10 and the battery pack 30. The energy conversion module 20 converts the electrical energy generated by the power generation module 10 to charge the battery pack 30 and / or supply power to external systems, or converts the electrical energy supplied by the battery pack 30 to supply power to external systems. This external power supply can refer to supplying power to an external power grid 01 or to an external load. The power grid 01 can also serve as a power supplement and absorption device.

[0079] The energy conversion module 20 may include a first conversion component 21 and a plurality of second conversion components 22. One end of the first conversion component 21 is connected to the power generation module 10, and the other end of the first conversion component 21 is connected to the power grid 01. The first conversion component 21 may be a bidirectional DC / AC component, and the bidirectional AC / DC component needs to support fast charge and discharge switching function.

[0080] refer to Figure 1 The energy storage system may include multiple battery packs connected in parallel 30 ( Figure 1Three battery packs 30 are shown, each of which may include a battery manager 31. One end of each of the plurality of second conversion components 22 is connected to one of the plurality of battery packs 30, and the other end of each of the plurality of second conversion components 22 is connected to one end of a first conversion component 21.

[0081] The second conversion component 22 can be a bidirectional DC-DC component. The bidirectional DC-DC component needs to support fast charge and discharge switching function and needs to meet the charge and discharge power required by the battery pack 30. The bidirectional DC-DC component can be an isolated component or a non-isolated component.

[0082] The first conversion component 21 is used to convert the electrical energy generated by the power generation module 10 into the power required by the power grid 01, thereby enabling the power generation module 10 to supply power to the power grid 01. The first conversion component 21 and a plurality of second conversion components 22 are also used to convert the electrical energy provided by the battery pack 30 into the power required by the power grid 01, so as to enable the battery pack 20 to supply power to the power grid 01. Each second conversion component 22 is also used to convert the electrical energy generated by the power generation module 10 into the charging power required by a corresponding battery pack 20, thereby enabling the power generation module 10 to charge the battery pack 30.

[0083] The main controller 40 is used to send a State of Health (SOH) detection command to the battery manager 31 in the battery pack 30. Upon receiving the SOH detection command, the battery manager 31 determines the allowable charge / discharge power of the battery pack 30 and sends the allowable charge / discharge power to the main controller.

[0084] The main controller 40 is also used to adjust the current output power of the power generation module 10 according to the allowable charge and discharge power, so that the current output power of the power generation module 10 meets the system power requirements for external power supply and the allowable charge and discharge power for charging and discharging the battery pack 30 when it is converted by the energy conversion module 20. The battery manager 31 is also used to determine the available capacity of the battery pack 30 after the battery pack 30 has been charged and discharged, calculate the SOH value of the battery pack based on the available capacity, and send the SOH value of the battery pack to the main controller 40.

[0085] Figure 2 This is a flowchart of a SOH detection method provided in an embodiment of this disclosure. This method can be applied to... Figure 1 The main controller 40 of the energy storage system is shown. (For example...) Figure 2 As shown, the method includes:

[0086] Step 201: Send an SOH detection command to the battery manager of the battery pack.

[0087] The main controller can send a State of Health (SOH) detection command to the battery manager of the battery pack. This SOH detection command instructs the battery manager to determine the allowable charge / discharge power of the battery pack. Upon receiving the SOH detection command, the battery manager can determine the allowable charge / discharge power of the battery pack and then send this allowable power to the main controller.

[0088] Step 202: Receive the charge / discharge allowable power sent by the battery manager, and adjust the output power of the power generation module according to the charge / discharge allowable power, so that the output power of the power generation module can charge and discharge the battery pack while meeting the system's power requirements.

[0089] After receiving the charge / discharge allowable power from the battery manager, the main controller can adjust the output power of the power generation module according to the charge / discharge allowable power, so that the output power of the power generation module can charge and discharge the battery pack while meeting the system's power requirements.

[0090] Step 203: Receive the SOH value of the battery pack sent by the battery manager.

[0091] After the battery pack has finished charging and discharging, the battery manager can determine the available capacity of the battery pack and calculate the SOH value of the battery pack based on the available capacity. Then, it can send the SOH value of the battery pack to the main controller, which can receive the SOH value of the battery pack.

[0092] In summary, this disclosure provides a State of Health (SOH) detection method. In this method, the main controller adjusts the output power of the power generation module based on the allowable charging and discharging power of the battery pack, ensuring that the output power of the power generation module meets the system's power requirements while charging and discharging the battery pack. This allows the battery pack to complete a full charge or discharge cycle, thereby obtaining the accurate current usable capacity of the battery pack and achieving precise calculation of the SOH value.

[0093] Figure 3 This is a flowchart of another SOH detection method provided in this disclosure embodiment, which can be applied to... Figure 1 The battery manager 31 of the battery pack 30 in the energy storage system shown. For example... Figure 3 As shown, the method includes:

[0094] Step 301: In response to the SOH detection command sent by the main controller, determine the allowable charging and discharging power of the battery pack.

[0095] The battery manager can determine the allowable charge and discharge power of the battery pack in response to the State of Health (SOH) detection command sent by the main controller. This SOH detection command is generated by the main controller when it determines that the energy storage system meets the SOH detection conditions.

[0096] Step 302: Send the charge / discharge allowable power to the main controller.

[0097] After determining the allowable charge and discharge power, the battery manager can send the allowable charge and discharge power to the main controller, instructing the main controller to adjust the output power of the power generation module in the energy storage system according to the allowable charge and discharge power, so that the output power of the power generation module can charge and discharge the battery pack while meeting the system's power requirements.

[0098] Step 303: After the battery pack is fully charged and discharged, determine the available capacity of the battery pack and calculate the SOH value of the battery pack based on the available capacity.

[0099] After the battery pack has finished charging and discharging, the battery manager determines the available capacity of the battery pack and calculates the SOH value of the battery pack based on the available capacity.

[0100] In summary, this disclosure provides a State of Health (SOH) detection method. In this method, after the battery manager sends the allowable charge / discharge power to the main controller, it can instruct the main controller to adjust the output power of the power generation module based on this allowable power. This ensures that the output power of the power generation module meets the system's power requirements while charging and discharging the battery pack. This allows the battery pack to complete a full charge or discharge cycle, enabling the battery manager to obtain the accurate current usable capacity of the battery pack and achieve precise calculation of the SOH value.

[0101] Figure 4 This is a flowchart of another SOH detection method provided in this disclosure embodiment, which can be applied to... Figure 1 The energy storage system shown includes a main controller 40 and a battery manager 31 for the battery pack 30. (As shown...) Figure 4 As shown, the method may include:

[0102] Step 401: When the main controller determines that the energy storage system meets the SOH detection conditions, it sends an SOH detection command to the battery manager.

[0103] The main controller can check whether the energy storage system meets the SOH (State of Health) detection conditions at regular intervals. When it determines that the energy storage system meets the SOH detection conditions, it sends an SOH detection command to the battery manager. When it determines that the energy storage system does not meet the SOH detection conditions, it does not need to send an SOH detection command to the battery manager. This detection interval can be a fixed interval pre-stored in the main controller.

[0104] In this embodiment, if the main controller determines that the output power of the power generation module is greater than the system's required power, and the duration for which the output power of the power generation module is greater than the system's required power is greater than or equal to a preset SOH detection duration, then the energy storage system can be determined to meet the SOH detection conditions. Here, the system's required power refers to the power currently required by the external power grid or load. The preset SOH detection duration can be a fixed duration pre-stored in the main controller, and this preset SOH detection duration refers to the time required to perform SOH detection on the battery pack. The output power of the power generation module refers to the current output power of the power generation module, and the system's required power refers to the current required power of the system.

[0105] If the output power of the power generation module is less than or equal to the system demand power, or if the output power of the power generation module is greater than the system demand power, but the duration for which the output power of the power generation module is greater than the system demand power is less than the preset SOH detection time, then it can be determined that the energy storage system does not meet the SOH detection conditions.

[0106] Understandably, since the power generation module needs to supply power to both the grid and the battery pack simultaneously during the SOH detection process, the SOH detection is performed when the output power of the power generation module is greater than the system's required power and the duration is greater than or equal to the preset SOH detection duration. This ensures that the power generation module can supply power to the grid normally while reliably detecting the SOH.

[0107] In this embodiment, the main controller can predict whether the output power of the power generation module is greater than the system demand power in the second time period, and whether the duration of such prediction is greater than or equal to a preset SOH detection duration, based on the output power of the power generation module in the first time period, the system demand power in the first time period, the actual meteorological data of the area where the energy storage system is located in the first time period, the predicted meteorological data of the area in the second time period predicted by the meteorological source, and the grid dispatch parameters in the second time period. If the output power of the power generation module is greater than the system demand power in the second time period, and the duration of such prediction is greater than or equal to the preset SOH detection duration, the main controller can determine that SOH detection can be performed in the second time period. Therefore, the main controller can send an SOH detection command to the battery manager when the second time period arrives, thereby ensuring the feasibility of SOH detection.

[0108] The actual and predicted meteorological data may include at least one of the following: irradiance, temperature, rainfall, light intensity, sunshine duration, cloud cover, clear sky index, and weather type. The power grid dispatch parameters may include power grid dispatch power and dispatch duration. This second time period follows the first time period.

[0109] Step 402: The battery manager responds to the SOH detection command and determines the allowable charging and discharging power of the battery pack.

[0110] After receiving the SOH detection command from the main controller, the battery manager can respond to the SOH detection command to determine the allowable charging and discharging power of the battery pack.

[0111] The battery manager can determine the allowable charge and discharge power of the battery pack based on the SOC value of the battery pack. This allowable charge and discharge power may, for example, refer to the maximum charging power that the battery pack can receive when charging, and / or the maximum discharge power of the battery pack when discharging.

[0112] Step 403: The battery manager sends the charge / discharge allowable power to the main controller.

[0113] After determining the allowable charge and discharge power of the battery pack, the battery manager can send the allowable charge and discharge power to the main controller, and the main controller can receive the allowable charge and discharge power sent by the battery manager.

[0114] Step 404: The main controller determines the first charging power of the battery pack based on the allowable charging and discharging power, and sends the first charging power to the battery manager.

[0115] After receiving the charge / discharge allowable power from the battery manager, the main controller can adjust the output power of the power generation module according to the allowable power, thereby enabling the output power of the power generation module to charge and discharge the battery pack while meeting the system's power requirements.

[0116] In this embodiment, the main controller can determine the first charging power of the battery pack based on the allowable charging and discharging power, and send the first charging power to the battery manager. The first charging power is equal to the difference between the output power of the power generation module and the system's required power, and is less than or equal to the maximum charging power within the allowable charging and discharging power.

[0117] Optionally, the main controller can adjust the output power of the power generation module to make the output power of the power generation module greater than the system's required power, thereby enabling the battery pack to be charged according to the first charging power.

[0118] For example, if the output power of the power generation module is less than or equal to the system's required power, the main controller can increase the output power of the power generation module so that its output power is greater than the system's required power.

[0119] Step 405: The battery manager controls the battery pack to charge according to the first charging power.

[0120] After receiving the first charging power from the main controller, the battery manager can control the battery pack to charge according to the first charging power, thereby enabling the power generation module to charge the battery pack.

[0121] Step 406: After determining that the battery pack is fully charged, the battery manager sends a first charging stop request to the main controller.

[0122] During the charging process of the battery pack according to the first charging power, the battery manager can periodically check whether the battery pack is fully charged. After determining that the battery pack is fully charged, it sends a first charging stop request to the main controller. The first charging stop request is used to instruct the main controller to control the power generation module to stop charging the battery pack and to control the output power of the power generation module to be equal to the system's required power, so that the battery pack can be left idle.

[0123] Optionally, during the charging process of the battery pack according to the first charging power, the battery manager can detect whether the battery pack voltage has reached the full charge cutoff voltage. If the battery pack voltage reaches the full charge cutoff voltage, it can be determined that the battery pack is fully charged. If the battery pack voltage does not reach the full charge cutoff voltage, it can be determined that the battery pack is not fully charged. The full charge cutoff voltage of the battery pack can be pre-stored in the battery manager.

[0124] Step 407: When the main controller receives the first charging stop request, it controls the power generation module to stop charging the battery pack and controls the output power of the power generation module to be equal to the system's required power, so that the battery pack can be left idle.

[0125] Upon receiving the first charging stop request from the battery manager, the main controller can determine that the battery pack is fully charged and therefore can control the power generation module to stop charging the battery pack. After controlling the power generation module to stop charging the battery pack, the main controller can adjust the output power of the power generation module to equal the system's power requirement, thereby allowing the battery pack to rest.

[0126] Optionally, if the output power of the power generation module is greater than the system's required power, the main controller can reduce the output power of the power generation module so that its output power equals the system's required power.

[0127] During the battery pack's resting period, it is not charged or discharged, thus eliminating the polarization phenomenon caused by charging and ensuring the accuracy of the battery manager's determination of the battery pack's available capacity. Therefore, during this resting period, the main controller can control the power generation module to discard sunlight, ensuring that its output power meets the system's power requirements; in other words, the output power of the power generation module can be controlled to equal the system's power demand.

[0128] Step 408: When the main controller determines the first discharge power of the battery pack based on the allowable charge and discharge power, it sends the first discharge power to the battery manager.

[0129] After controlling the power generation module to complete a full charge of the battery pack, the main controller can also control the battery pack to complete a full discharge. Therefore, after controlling the output power of the power generation module to equal the system's required power, the main controller can also determine the first discharge power of the battery pack based on the allowable charge and discharge power, and send this first discharge power to the battery manager. This first discharge power is equal to the difference between the system's required power and the power generation module's output power, and is less than or equal to the maximum discharge power within the allowable charge and discharge power.

[0130] Optionally, the main controller can adjust the output power of the power generation module so that the system's power demand is greater than the output power of the power generation module. This allows the battery manager to control the battery pack to discharge based on the first discharge power, so that the battery pack can supply power to the grid.

[0131] Step 409: The battery manager controls the battery pack to discharge according to the first discharge power.

[0132] After receiving the first discharge power from the main controller, the battery manager can control the battery pack to discharge according to the first discharge power, thereby enabling the battery pack to supply power to the grid.

[0133] Step 410: After determining that the battery pack is fully discharged, the battery manager sends a first discharge stop request to the main controller.

[0134] During the process of discharging the battery pack according to the first discharge power, the battery manager can periodically detect when the battery pack is fully discharged. After determining that the battery pack is fully discharged, it sends a first discharge stop request to the main controller. This first discharge stop request instructs the main controller to stop the battery pack from discharging and to control the output power of the power generation module to equal the system's required power, so that the battery pack can be allowed to rest.

[0135] Optionally, during the process of discharging the battery pack according to the first discharge power, the battery manager can detect whether the battery pack voltage has reached the full discharge cutoff voltage. If the battery pack voltage reaches the full discharge cutoff voltage, it can be determined that the battery pack is fully discharged. If the battery pack voltage does not reach the full discharge cutoff voltage, it can be determined that the battery pack is not fully discharged. The full discharge cutoff voltage of the battery pack can be pre-stored in the battery manager.

[0136] Step 411: When the main controller receives the first discharge stop request, it controls the battery pack to stop discharging and controls the output power of the power generation module to be equal to the system demand power, so that the battery pack can be left to stand still.

[0137] Upon receiving the first discharge stop request from the battery manager, the main controller can control the battery pack to stop discharging. After controlling the battery pack to stop discharging, the main controller can adjust the output power of the power generation module so that the output power of the power generation module equals the system's power requirement, thereby allowing the battery pack to rest.

[0138] Optionally, if the output power of the power generation module is less than the system's required power, the main controller can increase the output power of the power generation module so that the output power of the power generation module equals the system's required power.

[0139] During the battery pack's resting period, it does not undergo charging or discharging, thus eliminating the polarization caused by battery pack discharge and ensuring the accuracy of the battery manager's determination of the battery pack's available capacity. Therefore, during the battery pack's resting period, the main controller only needs to control the output power of the power generation module to meet the system's power requirements.

[0140] Step 412: After the battery pack has finished charging and discharging, the battery manager determines the available capacity of the battery pack and calculates the SOH value of the battery pack based on the available capacity.

[0141] The battery manager can determine the available capacity of the battery pack after the battery pack has completed a full charge and discharge cycle, and can calculate the SOH value of the battery pack based on the available capacity.

[0142] Optionally, the battery manager can determine the SOH value of the battery pack based on the available capacity and the nominal capacity. This nominal capacity is pre-stored in the battery manager. For example, the battery manager can determine the SOH value of the battery pack as the ratio of the available capacity to the nominal capacity.

[0143] Step 413: The battery manager sends the SOH value of the battery pack to the main controller.

[0144] After determining the SOH value of the battery pack, the battery manager can send the SOH value to the main controller, which in turn can receive the SOH value. Based on this received SOH value, the main controller can accurately determine the degree of aging of the battery pack.

[0145] In summary, this disclosure provides a State of Health (SOH) detection method. In this method, the main controller adjusts the output power of the power generation module based on the allowable charge / discharge power of the battery pack, ensuring that the output power of the power generation module meets the system's power requirements while charging and discharging the battery pack. This allows the battery pack to complete a full charge or discharge cycle, thereby obtaining the accurate current usable capacity of the battery pack and achieving precise SOH calculation.

[0146] Furthermore, by allowing the battery pack to rest after both charging and discharging, the polarization caused by charging and discharging can be eliminated, thus obtaining the accurate current usable capacity of the battery pack and enabling precise SOH calculation. This effectively solves the problem of reduced SOH detection accuracy caused by the OCV-SOC relationship curve after battery pack aging, providing accurate data for the 20 to 25 years of use of energy storage batteries, and playing a significant role in battery management system algorithms and strategies.

[0147] Figure 5 This is a flowchart of another SOH detection method provided in this disclosure embodiment, which can be applied to... Figure 1 The energy storage system shown includes a main controller 40 and a battery manager 31 for the battery pack 30. (As shown...) Figure 5 As shown, the method may include:

[0148] Step 501: When the main controller determines that the energy storage system meets the SOH detection conditions, it sends an SOH detection command to the battery manager.

[0149] The specific implementation process of step 501 can be referred to step 401 above, and will not be repeated here in this embodiment.

[0150] Step 502: The battery manager responds to the SOH detection command and determines the allowable charging and discharging power of the battery pack.

[0151] The specific implementation process of step 502 can be referred to step 402 above, and will not be repeated here in this embodiment.

[0152] Step 503: The battery manager sends the charge / discharge allowable power to the main controller.

[0153] The specific implementation process of step 503 can be referred to step 403 above, and will not be repeated here in this embodiment.

[0154] Step 504: The main controller determines the second discharge power of the battery pack based on the allowable charge and discharge power, and sends the second discharge power to the battery manager.

[0155] After receiving the charge / discharge allowable power from the battery manager, the main controller can adjust the output power of the power generation module according to the allowable power, thereby enabling the output power of the power generation module to charge and discharge the battery pack while meeting the system's power requirements.

[0156] In this embodiment, the main controller can determine the second discharge power of the battery pack based on the allowable charge / discharge power, and send the second discharge power to the battery manager. The second discharge power is equal to the difference between the system's required power and the output power of the power generation module, and the second discharge power is less than or equal to the maximum discharge power within the allowable charge / discharge power.

[0157] Optionally, the main controller can adjust the output power of the power generation module so that the output power of the power generation module is less than the system's required power. This allows the battery manager to control the battery pack to discharge according to the second discharge power, thereby controlling the battery pack to supply power to the grid.

[0158] For example, if the output power of the power generation module is greater than or equal to the system's required power, the main controller can reduce the output power of the power generation module so that its output power is less than the system's required power.

[0159] Step 505: The battery manager controls the battery pack to discharge according to the second discharge power.

[0160] After receiving the second discharge power from the main controller, the battery manager can control the battery pack to discharge according to the second discharge power, thereby enabling the battery pack to supply power to the grid.

[0161] Step 506: After determining that the battery pack is fully discharged, the battery manager sends a second discharge stop request to the main controller.

[0162] During the process of discharging the battery pack according to the second discharge power, the battery manager can periodically detect whether the battery pack is fully discharged. After determining that the battery pack is fully discharged, it sends a second discharge stop request to the main controller. This second discharge stop request instructs the main controller to stop the battery pack from discharging and to control the output power of the power generation module to equal the system's required power, so that the battery pack can be allowed to rest.

[0163] Optionally, during the process of discharging the battery pack according to the second discharge power, the battery manager can detect whether the battery pack voltage has reached the full discharge cutoff voltage. If the battery pack voltage reaches the full discharge cutoff voltage, it can be determined that the battery pack is fully discharged. If the battery pack voltage does not reach the full discharge cutoff voltage, it can be determined that the battery pack is not fully discharged. The full discharge cutoff voltage of the battery pack can be pre-stored in the battery manager.

[0164] Step 507: When the main controller receives the second discharge stop request, it controls the battery pack to stop discharging and controls the output power of the power generation module to be equal to the system's required power, so that the battery pack can be left to stand still.

[0165] When the main controller receives the second discharge stop request, it can control the battery pack to stop discharging. After controlling the battery pack to stop discharging, the main controller can adjust the output power of the power generation module so that the output power of the power generation module is equal to the system demand power, so that the battery pack can be left idle.

[0166] Optionally, if the output power of the power generation module is less than the system's required power, the main controller can increase the output power of the power generation module so that the output power of the power generation module equals the system's required power.

[0167] During the battery pack's resting period, it is neither charged nor discharged, thus eliminating the polarization phenomenon caused by battery pack discharge and ensuring the accuracy of battery pack capacity determination. Therefore, during the battery pack's resting period, the main controller only needs to control the output power of the power generation module to meet the system's power requirements.

[0168] Step 508: When the main controller determines the second charging power of the battery pack based on the allowable charging and discharging power, it sends the second charging power to the battery manager.

[0169] After controlling the power generation module to complete one full discharge cycle of the battery pack, the main controller can also control the battery pack to complete one full charge cycle. Therefore, after controlling the output power of the power generation module to equal the power required by the system, the main controller can also determine the second charging power of the battery pack based on the allowable charging and discharging power, and send the second charging power to the battery manager.

[0170] The second charging power is equal to the difference between the output power of the power generation module and the system demand power, and the second charging power is less than or equal to the maximum charging power in the allowable charging and discharging power.

[0171] Optionally, the main controller can adjust the output power of the power generation module to make the output power of the power generation module greater than the system's required power, thereby enabling the battery pack to be charged according to the second charging power.

[0172] For example, if the output power of the power generation module is less than or equal to the system's required power, the main controller can increase the output power of the power generation module so that its output power is greater than the system's required power.

[0173] Step 509: The battery manager controls the battery pack to charge according to the second charging power.

[0174] After receiving the second charging power from the main controller, the battery manager can control the battery pack to charge according to the second charging power, thereby enabling the power generation module to charge the battery pack.

[0175] Step 510: After determining that the battery pack is fully charged, the battery manager sends a second charging stop request to the main controller.

[0176] During the charging process of the battery pack according to the second charging power, the battery manager can periodically check whether the battery pack is fully charged. After determining that the battery pack is fully charged, it sends a second charging stop request to the main controller. This second charging stop request instructs the main controller to control the power generation module to stop charging the battery pack and to control the output power of the power generation module to equal the system's required power, thereby allowing the battery pack to rest.

[0177] Optionally, during the charging process controlled by the second charging power, the battery manager can detect whether the battery pack voltage has reached the full charge cutoff voltage. If the battery pack voltage reaches the full charge cutoff voltage, it can be determined that the battery pack is fully charged. If the battery pack voltage does not reach the full charge cutoff voltage, it can be determined that the battery pack is not fully charged. The full charge cutoff voltage of the battery pack can be pre-stored in the battery manager.

[0178] Step 511: When the main controller receives the second charging stop request, it controls the power generation module to stop charging the battery pack and controls the output power of the power generation module to be equal to the system's required power, so that the battery pack can be left idle.

[0179] Upon receiving the second charging stop request from the battery manager, the main controller can determine that the battery pack is fully charged and therefore can control the power generation module to stop charging the battery pack. After controlling the power generation module to stop charging the battery pack, the main controller can adjust the output power of the power generation module to equal the system's power requirement, thereby allowing the battery pack to rest.

[0180] Optionally, if the output power of the power generation module is greater than the system's required power, the main controller can reduce the output power of the power generation module so that its output power equals the system's required power.

[0181] During the battery pack's resting period, it is not charged or discharged, thus eliminating the polarization phenomenon caused by charging and ensuring the accuracy of the battery manager's determination of the battery pack's available capacity. Therefore, during this resting period, the main controller can control the power generation module to discard sunlight, ensuring that its output power meets the system's power requirements; in other words, the output power of the power generation module can be controlled to equal the system's power demand.

[0182] Step 512: After the battery pack has finished charging and discharging, the battery manager determines the available capacity of the battery pack and calculates the SOH value of the battery pack based on the available capacity.

[0183] The specific implementation of step 512 can be referred to step 412 above, and will not be repeated here in this embodiment.

[0184] Step 513: The battery manager sends the SOH value of the battery pack to the main controller.

[0185] The specific implementation of step 513 can be referred to step 413 above, and will not be repeated here in this embodiment.

[0186] In summary, this disclosure provides a State of Health (SOH) detection method. In this method, the main controller adjusts the output power of the power generation module based on the allowable charge / discharge power of the battery pack, ensuring that the output power of the power generation module meets the system's power requirements while charging and discharging the battery pack. This allows the battery pack to complete a full charge or discharge cycle, thereby obtaining the accurate current usable capacity of the battery pack and achieving precise SOH calculation.

[0187] Furthermore, by allowing the battery pack to rest after both charging and discharging, the polarization caused by charging and discharging can be eliminated, thus obtaining the accurate current usable capacity of the battery pack and enabling precise SOH calculation. This effectively solves the problem of reduced SOH detection accuracy caused by the OCV-SOC relationship curve after battery pack aging, providing accurate data for the 20 to 25 years of use of energy storage batteries, and playing a significant role in battery management system algorithms and strategies.

[0188] This disclosure provides a computer-readable storage medium storing a computer program. When executed by a computer device, the computer program causes the computer device to perform the aforementioned functions. Figures 2 to 5 Any of the SOH detection methods shown.

[0189] Figure 6 This is a schematic diagram of the structure of the main controller 40 in an energy storage system provided in this disclosure embodiment, as shown below. Figure 6 As shown, the main controller 40 includes a memory 41 and a processor 42. The memory 41 stores a computer program, which, when executed by the processor 42, causes the main controller 40 to perform the aforementioned functions. Figure 2 , Figure 4 and Figure 5 The SOH detection method shown is illustrated.

[0190] Figure 7 This is a schematic diagram of the structure of a battery manager 31 in an energy storage system according to an embodiment of the present disclosure. It includes a memory 311 and a processor 312. The memory 311 stores a computer program, which, when executed by the processor 312, causes the battery manager 31 to perform the aforementioned functions. Figures 3 to 4 The SOH detection method shown is illustrated.

[0191] Figure 8 This is a block diagram of an SOH detection device provided in an embodiment of this disclosure, applied to... Figure 1 The main controller 40 of the energy storage system shown is, for example Figure 8 As shown, the device includes:

[0192] The first determining module 801 is used to send a SOH detection command to the battery manager of the battery pack in the energy storage system, wherein the SOH detection command is used to instruct the battery manager to determine the allowable charging and discharging power of the battery pack.

[0193] The first receiving module 802 is used to receive the charge / discharge allowable power sent by the battery manager.

[0194] The first charge / discharge control module 803 is used to adjust the output power of the power generation module in the energy storage system according to the allowable charge / discharge power, so that the output power of the power generation module can charge and discharge the battery pack while meeting the system's power requirements.

[0195] The second receiving module 804 is also used to receive the SOH value of the battery pack sent by the battery manager, wherein the SOH value of the battery pack is determined after the battery pack has been charged and discharged.

[0196] Optionally, the first charge / discharge control module 803 is used to send the first charging power of the battery pack, determined according to the allowable charging / discharging power, to the battery manager to instruct the battery manager to control the battery pack to charge according to the first charging power, wherein the first charging power is equal to the difference between the output power of the power generation module and the system demand power.

[0197] Upon receiving the first charging stop request from the battery manager, the generator module is controlled to stop charging the battery pack.

[0198] The first discharge power of the battery pack, determined based on the allowable charge and discharge power, is sent to the battery manager to instruct the battery manager to control the battery pack to discharge according to the first discharge power, wherein the first discharge power is equal to the difference between the system demand power and the output power of the power generation module.

[0199] Upon receiving the first discharge stop request from the battery manager, the system controls the battery pack to stop discharging.

[0200] Optionally, the first charge / discharge control module 803 is also used to control the output power of the power generation module to be equal to the system demand power after the power generation module stops charging the battery pack, so that the battery pack can be left idle.

[0201] Optionally, the first charge / discharge control module 803 is also used to control the output power of the power generation module to be equal to the system's required power after the battery pack stops discharging, so that the battery pack can be left to stand still.

[0202] Optionally, the first charge / discharge control module 803 is used for:

[0203] The second discharge power of the battery pack, determined based on the allowable charge and discharge power, is sent to the battery manager to instruct the battery manager to control the battery pack to discharge according to the second discharge power, wherein the second discharge power is equal to the difference between the system demand power and the output power of the power generation module.

[0204] Upon receiving a second discharge stop request from the battery manager, control the battery pack to stop discharging;

[0205] The second charging power of the battery pack, determined based on the allowable charging and discharging power, is sent to the battery manager to instruct the battery manager to control the battery pack to charge according to the second charging power, wherein the second charging power is equal to the difference between the output power of the power generation module and the system demand power.

[0206] Upon receiving a second charging stop request from the battery manager, the control unit stops charging the battery pack.

[0207] Optionally, the first charge / discharge control module 803 is also used to control the output power of the power generation module to be equal to the system's required power after the battery pack stops discharging, so that the battery pack can be left to stand still.

[0208] Optionally, the first charge / discharge control module 803 is also used to control the output power of the power generation module to be equal to the system demand power after the power generation module stops charging the battery pack, so that the battery pack can be left idle.

[0209] The first determining module 801 is used to send an SOH detection command to the battery manager of the battery pack in the energy storage system when it is determined that the output power of the power generation module is greater than the system demand power and the duration is greater than or equal to the preset SOH detection time.

[0210] In summary, the present disclosure provides a State of Health (SOH) detection device. In this device, the main controller can adjust the output power of the power generation module according to the allowable charging and discharging power of the battery pack, so that the output power of the power generation module can charge and discharge the battery pack while meeting the system's power requirements. This allows the battery pack to complete a full charging or discharging cycle, thereby obtaining the current accurate usable capacity of the battery pack and achieving precise calculation of SOH.

[0211] Figure 9 This is a block diagram of another SOH detection device provided in this disclosure embodiment, applied to... Figure 1 The battery manager 31 of the battery pack in the energy storage system shown is as follows: Figure 9 As shown, the device includes:

[0212] The second determining module 901 is used to determine the allowable charging and discharging power of the battery pack in response to the SOH detection command sent by the main controller of the energy storage system.

[0213] The transmitting module 902 is used to send the allowable charging and discharging power to the main controller, so that the main controller can adjust the output power of the power generation module in the energy storage system according to the allowable charging and discharging power, thereby enabling the output power of the power generation module to charge and discharge the battery pack while meeting the system's power requirements.

[0214] The detection module 903 is used to determine the available capacity of the battery pack after the battery pack has been charged and discharged, and to calculate the SOH value of the battery pack based on the available capacity.

[0215] Optional, such as Figure 10 As shown, the device may further include a second charge / discharge control module 904, used for:

[0216] The battery pack is charged according to the first charging power sent by the main controller, where the first charging power is equal to the difference between the output power of the power generation module and the power required by the system.

[0217] After confirming that the battery pack is fully charged, a first charging stop request is sent to the main controller, instructing the main controller to control the power generation module to stop charging the battery pack.

[0218] The battery pack is controlled to discharge according to the first discharge power sent by the main controller, wherein the first discharge power is equal to the difference between the system's required power and the output power of the power generation module.

[0219] After determining that the battery pack is fully discharged, a first discharge stop request is sent to the main controller, instructing the main controller to control the battery pack to stop discharging.

[0220] Optionally, the first charging stop request is also used to instruct the main controller, after controlling the power generation module to stop charging the battery pack, to control the output power of the power generation module to be equal to the system demand power, so that the battery pack can be left idle.

[0221] Optionally, the first discharge stop request is also used to instruct the main controller to control the output power of the power generation module to be equal to the system demand power after controlling the battery pack to stop discharging, so as to allow the battery pack to rest.

[0222] Optional, such as Figure 10 As shown, the second charge / discharge control module 904 is used for:

[0223] The battery pack will be controlled to discharge according to the second discharge power sent by the main controller, where the second discharge power is equal to the difference between the system's required power and the output power of the power generation module.

[0224] After determining that the battery pack is fully discharged, a second discharge stop request is sent to the main controller, instructing the main controller to control the battery pack to stop discharging.

[0225] The battery pack is charged according to the second charging power sent by the main controller, where the second charging power is equal to the difference between the output power of the power generation module and the power required by the system.

[0226] After confirming that the battery pack is fully charged, a second charging stop request is sent to the main controller, instructing the main controller to control the power generation module to stop charging the battery pack.

[0227] Optionally, the second charging stop request is also used to instruct the main controller to control the output power of the power generation module to be equal to the system demand power after controlling the power generation module to stop charging the battery pack, so as to allow the battery pack to rest.

[0228] Optionally, the second discharge stop request is also used to instruct the main controller to control the output power of the power generation module to be equal to the system demand power after controlling the battery pack to stop discharging, so as to allow the battery pack to rest.

[0229] Optionally, the SOH detection command is sent by the main controller when it determines that the output power of the power generation module is greater than the system's required power and the duration is greater than or equal to the preset SOH detection duration.

[0230] In summary, this disclosure provides a State of Health (SOH) detection device. In this device, after the battery manager sends the allowable charge / discharge power to the main controller, it can instruct the main controller to adjust the output power of the power generation module based on this allowable power. This ensures that the output power of the power generation module meets the system's power requirements while charging and discharging the battery pack, thereby enabling the battery pack to complete a full charge or discharge cycle. Consequently, the battery manager can obtain the accurate current usable capacity of the battery pack, achieving precise calculation of the SOH value.

[0231] refer to Figure 1 In the energy storage system provided in this embodiment, the main controller 40 is also used to send the charge and discharge allowable power to the battery manager 31, wherein the first charging power is equal to the difference between the output power of the power generation module and the system demand power.

[0232] The battery manager 31 is also used to control the battery pack to charge according to the first charging power, and to send a first charging stop request to the main controller 40 when it is determined that the battery pack is fully charged.

[0233] The main controller 40 is also configured to control the power generation module to stop charging the battery pack when it receives a first charging stop request sent by the battery manager 31, and to send the first discharge power to the battery manager 31 when it determines the first discharge power of the battery pack according to the allowable charging and discharging power, wherein the first discharge power is equal to the difference between the system demand power and the output power of the power generation module.

[0234] The battery manager 31 is also used to control the battery pack to discharge according to the first discharge power, and to send a first discharge stop request to the main controller 40 after determining that the battery pack has been discharged.

[0235] The main controller 40 is also used to control the battery pack to stop discharging when it receives a first discharge stop request sent by the battery manager 31.

[0236] refer to Figure 1 The main controller 40 is also used to control the output power of the power generation module to be equal to the system demand power after the power generation module stops charging the battery pack, so that the battery pack can be left idle.

[0237] refer to Figure 1 The main controller 40 is also used to control the output power of the power generation module to be equal to the system demand power after the battery pack stops discharging, so that the battery pack can be allowed to rest.

[0238] refer to Figure 1 The main controller 40 is also used to determine the second discharge power of the battery pack based on the allowable charge and discharge power, and send the second discharge power to the battery manager 31, wherein the second discharge power is equal to the difference between the system demand power and the output power of the power generation module.

[0239] Battery manager 31 is also used to control the battery pack to discharge according to the second discharge power, and to send a second discharge stop request to main controller 40 after determining that the battery pack has been discharged.

[0240] The main controller 40 is also used to control the battery pack to stop discharging when it receives a second discharge stop request sent by the battery manager 31, and to send the second charging power to the battery manager 31 when it determines the second charging power of the battery pack according to the allowable charging and discharging power, wherein the second charging power is equal to the difference between the output power of the power generation module and the system demand power.

[0241] Battery manager 31 is also used to control the battery pack to charge according to the second charging power, and to send a second charging stop request to main controller 40 after determining that the battery pack is fully charged.

[0242] The main controller 40 is also used to control the power generation module to stop charging the battery pack when it receives a second charging stop request sent by the battery manager 31.

[0243] refer to Figure 1 The main controller 40 is also used to control the output power of the power generation module to be equal to the system demand power after the battery pack stops discharging, so that the battery pack can be allowed to rest.

[0244] refer to Figure 1The main controller 40 is also used to control the output power of the power generation module to be equal to the system demand power after the power generation module stops charging the battery pack, so that the battery pack can be left idle.

[0245] refer to Figure 1 The main controller 40 is also used to send an SOH detection command to the battery manager of the battery pack in the energy storage system when it is determined that the output power of the power generation module is greater than the system demand power and the duration is greater than or equal to the preset SOH detection time.

[0246] In summary, the embodiments of this disclosure provide an energy storage system in which the main controller can adjust the output power of the power generation module according to the allowable charging and discharging power of the battery pack, so that the output power of the power generation module can charge and discharge the battery pack while meeting the system's power requirements. This allows the battery pack to complete a full charge or discharge cycle, thereby obtaining the accurate current usable capacity of the battery pack and achieving precise calculation of State of Emergency (SOH).

[0247] It should be noted that the logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be specifically implemented in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a processor-included system, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this specification, "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transmit programs for use by, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of computer-readable media include: an electrical connection having one or more wires (electronic device), a portable computer disk drive (magnetic device), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Alternatively, the computer-readable medium may be paper or other suitable media on which the program can be printed, since the program can be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, interpreting, or otherwise processing as necessary, and then stored in a computer memory.

[0248] It should be understood that various parts of this disclosure can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented using software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0249] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "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 disclosure. 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.

[0250] In the description of this disclosure, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this disclosure and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this disclosure.

[0251] Furthermore, the terms "first," "second," etc., used in the embodiments of this disclosure are for descriptive purposes only and should not be construed as indicating or implying relative importance, or implicitly specifying the number of technical features indicated in this embodiment. Therefore, features defined with terms such as "first" and "second" in the embodiments of this disclosure can explicitly or implicitly indicate that the embodiment includes at least one of those features. In the description of this disclosure, the word "multiple" means at least two or more, such as two, three, four, etc., unless otherwise explicitly specified in the embodiments.

[0252] In this disclosure, unless otherwise explicitly specified or limited in the embodiments, the terms "installation," "connection," "joining," and "fixing," etc., appearing in the embodiments should be interpreted broadly. For example, a connection can be a fixed connection, a detachable connection, or an integral part; it can also be a mechanical connection, an electrical connection, etc. Of course, it can also be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication between two components, or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure based on the specific implementation.

[0253] In this disclosure, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0254] Although embodiments of the present disclosure have been shown and described above, it is to be understood that the above embodiments are exemplary and should not be construed as limiting the present disclosure. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present disclosure.

Claims

1. A method for detecting SO₂, characterized in that, The method, applied to the main controller of an energy storage system, includes: Sending a SOH detection command to the battery manager of the battery pack in the energy storage system, wherein the SOH detection command is used to instruct the battery manager to determine the charge and discharge allowable power of the battery pack; The system receives the allowable charge / discharge power sent by the battery manager and adjusts the output power of the power generation module in the energy storage system according to the allowable charge / discharge power, so that the output power of the power generation module can charge and discharge the battery pack while meeting the system's power requirements. Receive the SOH value of the battery pack sent by the battery manager, wherein the SOH value of the battery pack is determined after the battery pack has been charged and discharged; Adjusting the output power of the power generation module in the energy storage system according to the allowable charging and discharging power includes: The battery pack's first charging power, determined based on the allowed charging and discharging power, is sent to the battery manager to instruct the battery manager to control the battery pack to charge according to the first charging power, wherein the first charging power is equal to the difference between the output power of the power generation module and the system's required power. Upon receiving a first charging stop request from the battery manager, the battery manager controls the power generation module to stop charging the battery pack. The battery pack's first discharging power, determined based on the allowed charging and discharging power, is also sent to the battery manager to instruct the battery manager to control the battery pack to discharge according to the first discharging power, wherein the first discharging power is equal to the difference between the system's required power and the output power of the power generation module. Upon receiving a first discharging stop request from the battery manager, the battery manager controls the battery pack to stop discharging. or, The second discharge power of the battery pack, determined based on the allowable charge / discharge power, is sent to the battery manager to instruct the battery manager to control the battery pack to discharge according to the second discharge power, wherein the second discharge power is equal to the difference between the system required power and the output power of the power generation module. Upon receiving a second discharge stop request from the battery manager, the battery pack is controlled to stop discharging. The second charging power of the battery pack, determined based on the allowable charge / discharge power, is sent to the battery manager to instruct the battery manager to control the battery pack to charge according to the second charging power, wherein the second charging power is equal to the difference between the output power of the power generation module and the system required power. Upon receiving a second charging stop request from the battery manager, the power generation module is controlled to stop charging the battery pack.

2. The SOH detection method according to claim 1, characterized in that, Adjusting the output power of the power generation module in the energy storage system according to the allowable charging and discharging power also includes: After controlling the power generation module to stop charging the battery pack, the output power of the power generation module is controlled to be equal to the power required by the system, so that the battery pack is left idle.

3. The SOH detection method according to claim 1, characterized in that, Adjusting the output power of the power generation module in the energy storage system according to the allowable charging and discharging power also includes: After controlling the battery pack to stop discharging, the output power of the power generation module is controlled to be equal to the power required by the system, so that the battery pack is allowed to rest.

4. The SOH detection method according to any one of claims 1-3, characterized in that, Sending an SOH detection command to the battery manager of the battery pack in the energy storage system, including: When it is determined that the output power of the power generation module is greater than the power required by the system and the duration is greater than or equal to the preset SOH detection time, an SOH detection command is sent to the battery manager of the battery pack in the energy storage system.

5. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program, which, when executed by a computer device, causes the computer device to implement the SOH detection method according to any one of claims 1-4.

6. A main controller for an energy storage system, characterized in that, It includes a memory and a processor, the memory storing a computer program, which, when executed by the processor, causes the main controller to implement the SOH detection method according to any one of claims 1-4.

7. An energy storage system, characterized in that, The system includes a power generation module, an energy conversion module, a battery pack, and a main controller. The energy conversion module converts the electrical energy generated by the power generation module to charge the battery pack and / or supply power to external systems, or converts the electrical energy supplied by the battery pack to supply power to external systems. The main controller is used to send an SOH detection command to the battery manager in the battery pack; The battery manager is used to determine the allowable charge and discharge power of the battery pack when it receives the SOH detection command, and send the allowable charge and discharge power to the main controller; The main controller is also used to adjust the output power of the power generation module according to the allowable charging and discharging power, so that the output power of the power generation module meets the system power requirements for external power supply and the charging and discharging power for charging and discharging the battery pack when it is converted by the energy conversion module. The battery manager is also configured to determine the available capacity of the battery pack after the battery pack has been charged and discharged, calculate the SOH value of the battery pack based on the available capacity, and send the SOH value of the battery pack to the main controller. The main controller is also used for: The battery pack's first charging power, determined based on the allowed charging and discharging power, is sent to the battery manager to instruct the battery manager to control the battery pack to charge according to the first charging power, wherein the first charging power is equal to the difference between the output power of the power generation module and the system's required power. Upon receiving a first charging stop request from the battery manager, the battery manager controls the power generation module to stop charging the battery pack. The battery pack's first discharging power, determined based on the allowed charging and discharging power, is also sent to the battery manager to instruct the battery manager to control the battery pack to discharge according to the first discharging power, wherein the first discharging power is equal to the difference between the system's required power and the output power of the power generation module. Upon receiving a first discharging stop request from the battery manager, the battery manager controls the battery pack to stop discharging. or, The second discharge power of the battery pack, determined based on the allowable charge / discharge power, is sent to the battery manager to instruct the battery manager to control the battery pack to discharge according to the second discharge power, wherein the second discharge power is equal to the difference between the system required power and the output power of the power generation module. Upon receiving a second discharge stop request from the battery manager, the battery pack is controlled to stop discharging. The second charging power of the battery pack, determined based on the allowable charge / discharge power, is sent to the battery manager to instruct the battery manager to control the battery pack to charge according to the second charging power, wherein the second charging power is equal to the difference between the output power of the power generation module and the system required power. Upon receiving a second charging stop request from the battery manager, the power generation module is controlled to stop charging the battery pack.

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