SOH detection method and device and energy storage system

Abstract

The invention discloses an SOH (state of health) detection method and device and an energy storage system, and a main controller in the method can adjust the output power of a power generation module according to the charge and discharge allowable power of a battery pack, so that the output power of the power generation module can charge and discharge the battery pack while meeting the power required by the system. Therefore, the battery pack can complete a complete charging or discharging working condition, so that the current accurate available capacity of the battery pack is obtained, and accurate calculation of the SOH is realized.

Description

SOH detection method and device, energy storage system Technical Field

[0001] The present application relates to the field of batteries, and specifically to a SOH detection method and device, and an energy storage system. Background Art

[0002] Energy storage systems typically require battery packs to store excess power. However, these packs age over time, reducing their available capacity and, in turn, their state of health (SOH). To ensure the safe and stable operation of energy storage systems, it is necessary to monitor the battery pack's state of health (SOH).

[0003] However, the SOH detection solution in the related art has detection errors and low detection accuracy.

[0004] Summary of the Invention

[0005] In view of the above problems, the present application provides a SOH detection method and device, and an energy storage system, which can solve the problem of low SOH detection accuracy in related technologies.

[0006] In a first aspect, the present application provides a SOH detection method, which is applied to a main controller of an energy storage system. The method includes:

[0007] Sending a SOH detection instruction to a battery manager of a battery pack in the energy storage system, wherein the SOH detection instruction is used to instruct the battery manager to determine the allowable charge and discharge power of the battery pack;

[0008] Receive the allowed charge and discharge power sent by the battery manager and adjust the output power of the power generation module in the energy storage system according to the allowed 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 required power;

[0009] 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 is charged and discharged.

[0010] The disclosed embodiments provide a method for detecting state of health (SOH). In this method, a main controller adjusts the output power of a power generation module based on the battery pack's allowable charge and discharge power, ensuring that the module's output power meets the system's required power while simultaneously charging and discharging the battery pack. This allows the battery pack to complete a complete charge or discharge cycle, accurately determining the battery pack's current available capacity and enabling precise calculation of the SOH.

[0011] In some embodiments, adjusting the output power of a power generation module in an energy storage system according to the allowed charge and discharge power includes:

[0012] Sending a first charging power of the battery pack determined according to the allowed charge and discharge power to the battery manager to instruct the battery manager to control charging of the battery pack 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 required power;

[0013] Upon receiving the first charge stop request sent by the battery manager, controlling the power generation module to stop charging the battery pack;

[0014] Sending a first discharge power of the battery pack determined according to the allowed charge and discharge power to the battery manager to instruct the battery manager to control the discharge of the battery pack according to the first discharge power, where the first discharge power is equal to the difference between the system required power and the output power of the power generation module;

[0015] When the first discharge stop request sent by the battery manager is received, the battery pack is controlled to stop discharging.

[0016] The output power of the power generation module in the energy storage system is adjusted according to the allowed 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 required power.

[0017] In some embodiments, adjusting the output power of the power generation module in the energy storage system according to the allowed charge and discharge power further includes:

[0018] After the power generation module stops charging the battery pack, the output power of the power generation module is controlled to be equal to the system power requirement, so that the battery pack can rest. This eliminates the polarization caused by charging the battery pack, and thus accurately determines the current available capacity of the battery pack.

[0019] In some embodiments, adjusting the output power of the power generation module in the energy storage system according to the allowed charge and discharge power further includes:

[0020] After stopping the battery pack from discharging, the power generation module's output power is controlled to be equal to the system's required power, allowing the battery pack to rest. This eliminates polarization caused by battery pack discharge and accurately determines the battery pack's current available capacity.

[0021] In some embodiments, adjusting the output power of a power generation module in an energy storage system according to the allowed charge and discharge power includes:

[0022] Sending a second discharge power of the battery pack determined according to the allowed charge and discharge power to the battery manager to instruct the battery manager to control the discharge of the battery pack 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;

[0023] upon receiving a second discharge stop request sent by the battery manager, controlling the battery pack to stop discharging;

[0024] Sending a second charging power of the battery pack determined according to the allowed charge and discharge power to the battery manager to instruct the battery manager to control charging of the battery pack 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;

[0025] When the second charging stop request sent by the battery manager is received, the power generation module is controlled to stop charging the battery pack.

[0026] The output power of the power generation module in the energy storage system is adjusted according to the allowed charge and discharge power, so that the output power of the power generation module can discharge and then charge the battery pack while meeting the system's required power.

[0027] In some embodiments, adjusting the output power of the power generation module in the energy storage system according to the allowed charge and discharge power further includes:

[0028] After stopping the battery pack from discharging, the power generation module's output power is controlled to be equal to the system's required power, allowing the battery pack to rest. This eliminates polarization caused by battery pack discharge and accurately determines the battery pack's current available capacity.

[0029] In some embodiments, adjusting the output power of the power generation module in the energy storage system according to the allowed charge and discharge power further includes:

[0030] After the power generation module stops charging the battery pack, the output power of the power generation module is controlled to be equal to the system power requirement, so that the battery pack can rest. This eliminates the polarization caused by charging the battery pack, and thus accurately determines the current available capacity of the battery pack.

[0031] In some embodiments, sending an SOH detection instruction to a battery manager of a battery pack in an energy storage system includes:

[0032] 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, an SOH detection instruction is sent to the battery manager of the battery pack in the energy storage system, thereby realizing automatic SOH detection.

[0033] In a second aspect, a SOH detection method is provided, which is applied to a battery manager of a battery pack in an energy storage system. The method includes:

[0034] In response to a SOH detection instruction sent by a main controller of the energy storage system, determining the allowable charge and discharge power of the battery pack;

[0035] Sending the allowed charge and discharge 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 allowed charge and discharge power, thereby ensuring that the output power of the power generation module meets the system power requirements while charging and discharging the battery pack;

[0036] After the battery pack is charged and discharged, the available capacity of the battery pack is determined, and the SOH value of the battery pack is calculated based on the available capacity.

[0037] The disclosed embodiments provide a method for detecting SOH. In this method, after a battery manager sends the allowed charge and discharge power to a main controller, it can instruct the main controller to adjust the output power of the power generation module based on the allowed charge and discharge power. This allows the output power of the power generation module to charge and discharge the battery pack while meeting the system's required power, thereby enabling the battery pack to complete a complete charge or discharge cycle. This allows the battery manager to obtain the battery pack's current and accurate available capacity, enabling precise calculation of the SOH value.

[0038] In some embodiments, charging and discharging the battery pack includes:

[0039] Controlling charging of the battery pack according to a 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 system required power;

[0040] After determining that the battery pack is fully charged, sending a first charge stop request to the main controller, instructing the main controller to control the power generation module to stop charging the battery pack;

[0041] Controlling the battery pack to discharge according to a first discharge power sent by the main controller, wherein the first discharge power is equal to the difference between the system demand power and the output power of the power generation module;

[0042] After determining that the battery pack is fully discharged, a first discharge stop request is sent to the main controller to instruct the main controller to control the battery pack to stop discharging.

[0043] In some embodiments, the first charge 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 required power after controlling the power generation module to stop charging the battery pack, so as to allow the battery pack to be stationary.

[0044] 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 required power after controlling the battery pack to stop discharging, so as to allow the battery pack to be stationary.

[0045] In some embodiments, charging and discharging the battery pack includes:

[0046] Controlling the battery pack to discharge according to the second discharge power sent by the main controller;

[0047] After determining that the battery pack is fully discharged, sending a second discharge stop request to the main controller to instruct the main controller to control the battery pack to stop discharging;

[0048] Controlling charging of the battery pack according to the second charging power sent by the main controller;

[0049] After determining 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.

[0050] In some embodiments, the second charge 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 required power after controlling the power generation module to stop charging the battery pack, so as to allow the battery pack to be stationary.

[0051] 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 required power after controlling the battery pack to stop discharging, so as to allow the battery pack to be stationary.

[0052] In some embodiments, the SOH detection instruction is sent by the main controller when it determines that the output power of the power generation module is greater than the system required power and the duration is greater than or equal to the preset SOH detection duration.

[0053] In a third aspect, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a computer device, the computer device implements the SOH detection method of the above aspect.

[0054] In a fourth aspect, a main controller of an energy storage system is provided, comprising a memory and a processor, wherein the memory stores a computer program, and when the computer program is executed by the processor, the main controller implements the SOH detection method of the above aspect.

[0055] In a fifth aspect, a battery manager for a battery pack in an energy storage system is provided, comprising a memory and a processor, wherein the memory stores a computer program, and when the computer program is executed by the processor, the battery manager implements the SOH detection method in the above aspect.

[0056] In a sixth aspect, an energy storage system is provided, comprising a power generation module, an energy conversion module, a battery pack, and a main controller, wherein the energy conversion module is used to convert the power generated by the power generation module to charge the battery pack and / or supply power to the outside, or to convert the power provided by the battery pack to supply power to the outside, wherein:

[0057] The main controller is used to send SOH detection instructions to the battery manager in the battery pack;

[0058] The battery manager is used to determine the allowable charge and discharge power of the battery pack upon receiving the SOH detection instruction, and send the allowable charge and discharge power to the main controller;

[0059] The main controller is further used to adjust the output power of the power generation module according to the allowed charge and discharge power, so that the output power of the power generation module meets the system power requirements for external power supply and the charge and discharge power for charging and discharging the battery pack when converted by the energy conversion module;

[0060] The battery manager is also used to determine the available capacity of the battery pack after the battery pack is 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.

[0061] Additional aspects and advantages of the present disclosure will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0062] FIG1 is a schematic structural diagram of an energy storage system provided by an embodiment of the present disclosure;

[0063] FIG2 is a flow chart of a SOH detection method provided by an embodiment of the present disclosure;

[0064] FIG3 is a flow chart of another SOH detection method provided by an embodiment of the present disclosure;

[0065] FIG4 is a flow chart of another SOH detection method provided by an embodiment of the present disclosure;

[0066] FIG5 is a flow chart of another SOH detection method provided by an embodiment of the present disclosure;

[0067] FIG6 is a schematic structural diagram of a main controller provided by an embodiment of the present disclosure;

[0068] FIG7 is a schematic structural diagram of a battery manager provided by an embodiment of the present disclosure;

[0069] FIG8 is a block diagram of an SOH detection device provided by an embodiment of the present disclosure;

[0070] FIG9 is a block diagram of another SOH detection device provided by an embodiment of the present disclosure;

[0071] FIG10 is a block diagram of another SOH detection device provided by an embodiment of the present disclosure. DETAILED DESCRIPTION

[0072] The following describes in detail embodiments of the present disclosure, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present disclosure, and should not be construed as limiting the present disclosure.

[0073] Currently, energy storage systems typically require battery packs, typically lithium batteries, to store excess power. The lifespan of a battery pack is generally expected to be 20 to 25 years. However, over time, these packs age, reducing their available capacity and, consequently, their health. To ensure the safe and stable operation of energy storage systems, the battery pack's SOH value must be tested.

[0074] In the related art, SOH detection is usually performed during the use of the battery pack. Specifically, when the battery pack is in a low current state or a static state, the open circuit voltage (OCV) of the battery cell in the battery pack is obtained by looking up the table, and the SOC value corresponding to the open circuit voltage of the battery cell is obtained according to the pre-calibrated OCV-state of charge (SOC) value relationship curve. Then, the accumulated charging capacity or discharging capacity during this period is calculated based on the obtained SOC value, and the actual available capacity of the battery pack is estimated based on the charging capacity or discharging capacity, and finally the SOH value is determined based on the actual available capacity.

[0075] However, after long-term use of the battery pack, the OCV-SOC value relationship curve will change as the battery pack ages. Therefore, the SOC value determined based on the relationship curve is different from the actual SOC value, resulting in a lower accuracy of the determined SOC value, which in turn leads to a lower accuracy of the determined SOH value. Moreover, if the same charge and discharge current is used for charging and discharging, there will be an overcurrent risk. In addition, since the SOH test requires the battery pack to be in a low current state or a static state, and the charge and discharge current of the battery pack is controlled according to the operating conditions of the battery pack, it cannot fully meet the SOH test requirements.

[0076] The disclosed embodiments provide a method for detecting SOH. In this method, a main controller allocates energy based on the output power of the power generation module, the battery pack's allowable charge and discharge power, and the system's required power. This allows the power generation module's output power to charge and discharge the battery pack while meeting the system's required power. This allows the battery pack to complete a full charge or discharge cycle, accurately determining the battery pack's current available capacity and enabling precise calculation of the SOH value. This solution can address the issue of reduced SOH detection accuracy caused by an aged OCV-SOC relationship curve.

[0077] FIG1 is a schematic structural diagram of an energy storage system provided in an embodiment of the present disclosure. As shown in FIG1 , 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 .

[0078] 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. For example, the power generation module 10 may include a photovoltaic power generation module, which may include a photovoltaic module and a photovoltaic inverter with a maximum power point tracking (MPPT) unit. The photovoltaic module is used to convert solar energy into electrical energy. The photovoltaic inverter is used to monitor the power generation voltage of the photovoltaic module and track the highest voltage and current values ​​to transmit the maximum power to the energy conversion module 20.

[0079] The energy conversion module 20 is connected to the power generation module 10 and the battery pack 30, respectively. The energy conversion module 20 is used to convert the power generated by the power generation module 10 to charge the battery pack 30 and / or provide external power, or to convert the power provided by the battery pack 30 to provide external power. The external power supply can refer to powering an external power grid 01 or an external load. The power grid 01 can also serve as a power supply and absorption device.

[0080] The energy conversion module 20 may include a first conversion component 21 and multiple 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 direct current / alternating current (DC / AC) component that supports fast charge and discharge switching.

[0081] Referring to Figure 1 , the energy storage system may include multiple parallel-connected battery packs 30 (Figure 1 shows three battery packs 30 ), each of which may include a battery manager 31 . One end of each of the multiple second conversion assemblies 22 is connected to each of the multiple battery packs 30 in a one-to-one correspondence, and the other end of each of the multiple second conversion assemblies 22 is connected to one end of the first conversion assembly 21 .

[0082] The second conversion component 22 may be a bidirectional DCDC component, which needs to support a fast charge and discharge switching function and meet the charge and discharge power required by the battery pack 30 . The bidirectional DCDC component may be an isolated component or a non-isolated component.

[0083] The first conversion assembly 21 is used to convert the generated electrical energy of 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 assembly 21 and multiple second conversion assemblies 22 are also used to convert the electrical energy provided by the battery pack 30 into the power required by the power grid 01, thereby enabling the battery pack 20 to supply power to the power grid 01. Each second conversion assembly 22 is also used to convert the generated electrical energy of 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.

[0084] The main controller 40 is configured to send an SOH detection instruction to the battery manager 31 in the battery pack 30. The battery manager 31 is configured to determine the charge and discharge allowable power of the battery pack 30 upon receiving the SOH detection instruction and send the charge and discharge allowable power to the main controller.

[0085] The main controller 40 is further configured to adjust the current output power of the power generation module 10 based on the allowable charge and discharge power, so that the current output power of the power generation module 10, when converted by the energy conversion module 20, meets the system power requirement for external power supply and the allowable charge and discharge power for charging and discharging the battery pack 30. The battery manager 31 is further configured to determine the available capacity of the battery pack 30 after charging and discharging of the battery pack 30 is completed, calculate the state of health (SOH) value of the battery pack based on the available capacity, and transmit the SOH value of the battery pack to the main controller 40.

[0086] FIG2 is a flow chart of a SOH detection method provided by an embodiment of the present disclosure, which can be applied to the main controller 40 of the energy storage system shown in FIG1 . As shown in FIG2 , the method includes:

[0087] Step 201: Send a SOH detection instruction to the battery manager of the battery pack.

[0088] The main controller can send a SOH detection instruction to the battery manager of the battery pack. The SOH detection instruction is used to instruct the battery manager to determine the allowable charge and discharge power of the battery pack. After receiving the SOH detection instruction, the battery manager can determine the allowable charge and discharge power of the battery pack and send the allowable charge and discharge power to the main controller.

[0089] Step 202: Receive the charge and discharge allowable power sent by the battery manager, and adjust the output power of the power generation module according to the charge and discharge allowable power, so that the output power of the power generation module can charge and discharge the battery pack while meeting the system power requirement.

[0090] After receiving the charge and discharge allowable power sent by the battery manager, the main controller can adjust the output power of the power generation module according to the charge and 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 required power.

[0091] Step 203: Receive the SOH value of the battery pack sent by the battery manager.

[0092] After the battery pack is charged and discharged, 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. The SOH value of the battery pack can then be sent to the main controller, and the corresponding main controller can receive the SOH value of the battery pack.

[0093] In summary, the disclosed embodiments provide a method for detecting SOH (State of Health) (SOH) in which a main controller adjusts the output power of a power generation module based on the battery pack's allowable charge and discharge power, ensuring that the module's output power meets the system's required power while simultaneously charging and discharging the battery pack. This allows the battery pack to complete a complete charge or discharge cycle, accurately determining the battery pack's current available capacity and enabling precise calculation of the SOH value.

[0094] FIG3 is a flow chart of another SOH detection method provided by an embodiment of the present disclosure, which can be applied to the battery manager 31 of the battery pack 30 in the energy storage system shown in FIG1 . As shown in FIG3 , the method includes:

[0095] Step 301: In response to the SOH detection instruction sent by the main controller, determine the allowable charge and discharge power of the battery pack.

[0096] The battery manager can determine the allowable charge and discharge power of the battery pack in response to the SOH detection instruction sent by the main controller. The SOH detection instruction is generated by the main controller when it determines that the energy storage system meets the SOH detection condition.

[0097] Step 302: Send the charge and discharge permission power to the main controller.

[0098] After determining the allowed charge and discharge power, the battery manager can send the allowed charge and discharge power to the main controller to instruct the main controller to adjust the output power of the power generation module in the energy storage system according to the allowed 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 required power.

[0099] Step 303: After the battery pack is charged and discharged, the available capacity of the battery pack is determined, and the SOH value of the battery pack is calculated based on the available capacity.

[0100] After the battery pack is charged and discharged, 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.

[0101] In summary, the disclosed embodiments provide a method for detecting SOH. In this method, after the battery manager sends the allowed charge and discharge power to the main controller, it can instruct the main controller to adjust the output power of the power generation module based on the allowed 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 required power. This allows the battery pack to complete a complete charge or discharge cycle, allowing the battery manager to obtain the battery pack's current and accurate available capacity, thereby accurately calculating the SOH value.

[0102] FIG4 is a flow chart of another SOH detection method provided by an embodiment of the present disclosure, which can be applied to the main controller 40 and the battery manager 31 of the battery pack 30 in the energy storage system shown in FIG1 . As shown in FIG4 , the method may include:

[0103] Step 401: When the main controller determines that the energy storage system meets the SOH detection conditions, it sends an SOH detection instruction to the battery manager.

[0104] The main controller can detect whether the energy storage system meets the SOH detection conditions at intervals of a detection time. If the energy storage system is determined to meet the SOH detection conditions, the main controller sends an SOH detection instruction to the battery manager. If the energy storage system is determined not to meet the SOH detection conditions, there is no need to send an SOH detection instruction to the battery manager. The detection time can be a fixed time pre-stored in the main controller.

[0105] In an embodiment of the present disclosure, if the main controller determines that the output power of the power generation module is greater than the system demand power, and the duration for which the output power of the power generation module is greater than the system demand power is greater than or equal to the preset SOH detection duration, it can be determined that the energy storage system meets the SOH detection conditions. The system demand 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 the preset SOH detection duration refers to the duration required for SOH detection of 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 demand power refers to the current demand power of the system.

[0106] If the output power of the power generation module is less than or equal to the system required power, or the output power of the power generation module is greater than the system required power, but the duration of the output power of the power generation module being greater than the system required power is less than the preset SOH detection duration, it can be determined that the energy storage system does not meet the SOH detection conditions.

[0107] It can be understood that since the power generation module needs to supply power to the power grid and the battery pack at the same time during the SOH detection process, the SOH detection is performed when 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. This ensures that the SOH can be reliably detected while the power generation module can supply power to the power grid normally.

[0108] In an embodiment of the present disclosure, the main controller can predict whether the output power of the power generation module in the second time period is greater than the system demand power in the second time period, and whether the duration is greater than or equal to the 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 in the second time period is greater than the system demand power in the second time period, and the duration is greater than or equal to the preset SOH detection duration, the main controller can determine that the SOH detection can be performed in the second time period. Therefore, the main controller can send an SOH detection instruction to the battery manager when the second time period is reached, thereby ensuring the feasibility of the SOH detection.

[0109] The actual meteorological data and the predicted meteorological data may each include at least one of irradiance, temperature, rainfall, light intensity, light duration, cloud cover, clear sky index, and weather type. The power grid dispatch parameters may include power grid dispatch power and power grid dispatch duration. The second time period is located after the first time period.

[0110] Step 402: The battery manager determines the allowable charge and discharge power of the battery pack in response to the SOH detection instruction.

[0111] After receiving the SOH detection instruction sent by the main controller, the battery manager can determine the charge and discharge allowable power of the battery pack in response to the SOH detection instruction.

[0112] The battery manager may determine the allowable charge and discharge power of the battery pack based on the SOC value of the battery pack. The allowable charge and discharge power may, for example, refer to the maximum charge power that the battery pack can receive when charging the battery pack and / or the maximum discharge power of the battery pack when discharging the battery pack.

[0113] Step 403: The battery manager sends the charge and discharge allowed power to the main controller.

[0114] After determining the allowed charge and discharge power of the battery pack, the battery manager may send the allowed charge and discharge power to the main controller. Correspondingly, the main controller may receive the allowed charge and discharge power sent by the battery manager.

[0115] Step 404: The main controller determines a first charging power of the battery pack according to the allowed charging and discharging power, and sends the first charging power to the battery manager.

[0116] After receiving the charge and discharge permission power sent by the battery manager, the main controller can adjust the output power of the power generation module according to the charge and discharge permission power, so that the output power of the power generation module can charge and discharge the battery pack while meeting the system power requirements.

[0117] In an embodiment of the present disclosure, the main controller can determine a first charging power for the battery pack based on the allowed charge and discharge 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 power requirement, and the first charging power is less than or equal to the maximum charging power among the allowed charge and discharge powers.

[0118] 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 greater than the power required by the system, thereby charging the battery pack according to the first charging power.

[0119] For example, if the output power of the power generation module is less than or equal to the system required power, the main controller may increase the output power of the power generation module so that the output power of the power generation module is greater than the system required power.

[0120] Step 405: The battery manager controls the battery pack to charge according to the first charging power.

[0121] After receiving the first charging power sent by 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.

[0122] Step 406: After determining that the battery pack is fully charged, the battery manager sends a first charge stop request to the main controller.

[0123] While controlling the charging of the battery pack according to the first charging power, the battery manager may periodically detect whether the battery pack is fully charged. Upon determining that the battery pack is fully charged, the battery manager may send a first charge stop request to the main controller. The first charge stop request instructs the main controller to control the power generation module to stop charging the battery pack and to control the power output of the power generation module to be equal to the system power requirement, so that the battery pack is at rest.

[0124] Optionally, while controlling the charging of the battery pack according to the first charging power, the battery manager may detect whether the voltage of the battery pack has reached a full-charge cutoff voltage. If the voltage of the battery pack has reached the full-charge cutoff voltage, the battery pack may be determined to be fully charged. If the voltage of the battery pack has not reached the full-charge cutoff voltage, the battery pack may be determined to be not fully charged. The battery manager may pre-store the full-charge cutoff voltage of the battery pack.

[0125] Step 407 : When receiving the first charge stop request, the main controller 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 required power, so that the battery pack is at rest.

[0126] After receiving the first charge stop request from the battery manager, the main controller can determine that the battery pack is fully charged and 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 ensure that the output power of the power generation module is equal to the system power demand, thereby allowing the battery pack to rest.

[0127] Optionally, if the output power of the power generation module is greater than the system required power, the main controller may reduce the output power of the power generation module so that the output power of the power generation module is equal to the system required power.

[0128] While the battery pack is at rest, it doesn't charge or discharge. This eliminates the polarization caused by charging, ensuring the battery manager's accurate determination of the battery pack's available capacity. Therefore, while the battery pack is at rest, the main controller can control the power generation module to curtail power, ensuring that the module's output power meets the system's required power. In other words, the module's output power can be controlled to equal the system's required power.

[0129] Step 408 : When the main controller determines the first discharge power of the battery pack according to the charge and discharge allowable power, the main controller sends the first discharge power to the battery manager.

[0130] After controlling the power generation module to fully charge the battery pack, the main controller can also control the battery pack to fully discharge. Therefore, after controlling the power generation module's output power to equal the system's required power, the main controller can also determine the battery pack's first discharge power based on the allowed 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 allowed charge and discharge power ranges.

[0131] Optionally, the main controller can adjust the output power of the power generation module so that the system demand power is greater than the output power of the power generation module, thereby enabling the battery manager to control the battery pack to discharge according to the first discharge power to enable the battery pack to supply power to the grid.

[0132] Step 409: The battery manager controls the battery pack to discharge according to the first discharge power.

[0133] After receiving the first discharge power sent by 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.

[0134] Step 410: After determining that the battery pack is fully discharged, the battery manager sends a first discharge stop request to the main controller.

[0135] While controlling the battery pack to discharge according to the first discharge power, the battery manager may periodically detect when the battery pack is fully discharged. Upon determining that the battery pack is fully discharged, the battery manager may send a first discharge stop request to the main controller. The first discharge stop request instructs the main controller to stop discharging the battery pack and control the output power of the power generation module to be equal to the system required power, thereby allowing the battery pack to rest.

[0136] Optionally, while controlling the discharge of the battery pack according to the first discharge power, the battery manager may detect whether the voltage of the battery pack has reached a full-discharge cutoff voltage. If the voltage of the battery pack has reached the full-discharge cutoff voltage, it may be determined that the battery pack is fully discharged. If the voltage of the battery pack has not reached the full-discharge cutoff voltage, it may be determined that the battery pack is not fully discharged. The battery manager may pre-store the full-discharge cutoff voltage of the battery pack.

[0137] Step 411 : When receiving the first discharge stop request, the main controller controls the battery pack to stop discharging and controls the output power of the power generation module to be equal to the system required power, so that the battery pack is at rest.

[0138] Upon receiving the first discharge stop request from the battery manager, the main controller may control the battery pack to stop discharging. After controlling the battery pack to stop discharging, the main controller may adjust the output power of the power generation module so that the output power of the power generation module equals the system power requirement, thereby allowing the battery pack to rest.

[0139] Optionally, if the output power of the power generation module is less than the system required power, the main controller may increase the output power of the power generation module so that the output power of the power generation module is equal to the system required power.

[0140] During the rest period, the battery pack does not charge or discharge, eliminating polarization caused by discharge. This ensures the battery manager's accurate determination of the available capacity. Therefore, during the rest period, the main controller controls the power output of the power generation module to meet the system's power requirements.

[0141] Step 412: After the battery pack is charged and discharged, 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.

[0142] The battery manager can determine the available capacity of the battery pack after the battery pack is charged and discharged, that is, after the battery pack completes a full charge and discharge, and can calculate the SOH value of the battery pack based on the available capacity.

[0143] Optionally, the battery manager may determine the SOH value of the battery pack based on the available capacity and the nominal capacity. The battery manager pre-stores the nominal capacity. For example, the battery manager may determine the ratio of the available capacity to the nominal capacity as the SOH value of the battery pack.

[0144] Step 413: The battery manager sends the SOH value of the battery pack to the main controller.

[0145] After determining the SOH value of the battery pack, the battery manager can send the SOH value of the battery pack to the main controller, and the main controller can receive the SOH value of the battery pack. The main controller can then accurately determine the degree of aging of the battery pack based on the received SOH value.

[0146] In summary, the disclosed embodiments provide a method for detecting SOH, in which a main controller adjusts the output power of the power generation module based on the battery pack's allowable charge and discharge power, ensuring that the module's output power meets the system's required power while simultaneously charging and discharging the battery pack. This allows the battery pack to complete a complete charge or discharge cycle, accurately determining the battery pack's current available capacity and enabling precise calculation of the SOH.

[0147] Furthermore, by allowing the battery pack to rest after charging and discharging, polarization caused by discharging and charging is eliminated, thereby accurately determining the battery pack's current available capacity and enabling precise SOH calculation. This effectively addresses the issue of reduced SOH detection accuracy caused by the OCV-SOC relationship curve after battery pack aging, providing accurate data for energy storage batteries over a 20-25 year lifespan, significantly impacting battery management system algorithms and strategies.

[0148] FIG5 is a flow chart of another SOH detection method provided by an embodiment of the present disclosure, which can be applied to the main controller 40 and the battery manager 31 of the battery pack 30 in the energy storage system shown in FIG1 . As shown in FIG5 , the method may include:

[0149] Step 501: When the main controller determines that the energy storage system meets the SOH detection condition, it sends an SOH detection instruction to the battery manager.

[0150] The specific implementation process of step 501 can refer to the above step 401, and will not be repeated here in this embodiment of the present disclosure.

[0151] Step 502: The battery manager determines the allowable charge and discharge power of the battery pack in response to the SOH detection instruction.

[0152] The specific implementation process of step 502 can refer to the above step 402, and will not be repeated here in this embodiment of the present disclosure.

[0153] Step 503: The battery manager sends the charge and discharge allowed power to the main controller.

[0154] The specific implementation process of step 503 can refer to the above step 403, and will not be repeated here in this embodiment of the present disclosure.

[0155] Step 504: The main controller determines a second discharge power of the battery pack according to the allowed charge and discharge power, and sends the second discharge power to the battery manager.

[0156] After receiving the charge and discharge permission power sent by the battery manager, the main controller can adjust the output power of the power generation module according to the charge and discharge permission power, so that the output power of the power generation module can charge and discharge the battery pack while meeting the system power requirements.

[0157] In an embodiment of the present disclosure, the main controller can determine a second discharge power for the battery pack based on the allowed charge and discharge power, and send the second discharge power to the battery manager. The second discharge power is equal to the difference between the system required power and the output power of the power generation module, and is less than or equal to the maximum discharge power among the allowed charge and discharge powers.

[0158] 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 required power, so that the battery manager can control the battery pack to discharge according to the second discharge power to control the battery pack to supply power to the grid.

[0159] For example, if the output power of the power generation module is greater than or equal to the system required power, the main controller may reduce the output power of the power generation module so that the output power of the power generation module is less than the system required power.

[0160] Step 505: The battery manager controls the battery pack to discharge according to the second discharge power.

[0161] After receiving the second discharge power sent by 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.

[0162] Step 506: After determining that the battery pack is fully discharged, the battery manager sends a second discharge stop request to the main controller.

[0163] While controlling the battery pack to discharge according to the second discharge power, the battery manager may periodically detect whether the battery pack is fully discharged. Upon determining that the battery pack is fully discharged, the battery manager may send a second discharge stop request to the main controller. The second discharge stop request instructs the main controller to stop discharging the battery pack and control the output power of the power generation module to be equal to the system power requirement, thereby allowing the battery pack to rest.

[0164] Optionally, while controlling the discharge of the battery pack according to the second discharge power, the battery manager may detect whether the voltage of the battery pack has reached a full-discharge cutoff voltage. If the voltage of the battery pack has reached the full-discharge cutoff voltage, it may be determined that the battery pack is fully discharged. If the voltage of the battery pack has not reached the full-discharge cutoff voltage, it may be determined that the battery pack is not fully discharged. The battery manager may pre-store the full-discharge cutoff voltage of the battery pack.

[0165] Step 507 : When receiving the second discharge stop request, the main controller controls the battery pack to stop discharging and controls the output power of the power generation module to be equal to the system required power, so that the battery pack is at rest.

[0166] 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 required power, so that the battery pack can be stationary.

[0167] Optionally, if the output power of the power generation module is less than the system required power, the main controller may increase the output power of the power generation module so that the output power of the power generation module is equal to the system required power.

[0168] During the rest period, the battery pack does not charge or discharge, thus eliminating the polarization phenomenon caused by discharge and ensuring the accuracy of the battery pack capacity determination. Therefore, during the rest period, the main controller controls the output power of the power generation module to meet the system power requirements.

[0169] Step 508 : When the main controller determines the second charging power of the battery pack according to the allowed charging and discharging power, the main controller sends the second charging power to the battery manager.

[0170] After controlling the power generation module to fully discharge the battery pack, the main controller can also control the battery pack to fully charge. Therefore, after controlling the power generation module's output power to equal the system's required power, the main controller can also determine a second charging power for the battery pack based on the allowed charge and discharge power, and send this second charging power to the battery manager.

[0171] The second charging power is equal to the difference between the output power of the power generation module and the system required power, and the second charging power is less than or equal to the maximum charging power among the allowed charging and discharging powers.

[0172] 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 greater than the system demand power, thereby charging the battery pack according to the second charging power.

[0173] For example, if the output power of the power generation module is less than or equal to the system required power, the main controller may increase the output power of the power generation module so that the output power of the power generation module is greater than the system required power.

[0174] Step 509: The battery manager controls the battery pack to charge according to the second charging power.

[0175] After receiving the second charging power sent by 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.

[0176] Step 510: After determining that the battery pack is fully charged, the battery manager sends a second charge stop request to the main controller.

[0177] While controlling the charging of the battery pack according to the second charging power, the battery manager may periodically detect whether the battery pack is fully charged. Upon determining that the battery pack is fully charged, the battery manager may send a second charge stop request to the main controller. The second charge stop request instructs the main controller to control the power generation module to stop charging the battery pack and to control the power output of the power generation module to be equal to the system power requirement, thereby allowing the battery pack to rest.

[0178] Optionally, while controlling the charging of the battery pack according to the second charging power, the battery manager may detect whether the voltage of the battery pack has reached a full-charge cutoff voltage. If the voltage of the battery pack has reached the full-charge cutoff voltage, the battery pack may be determined to be fully charged. If the voltage of the battery pack has not reached the full-charge cutoff voltage, the battery pack may be determined to be incompletely charged. The battery manager may pre-store the full-charge cutoff voltage of the battery pack.

[0179] Step 511 : When receiving the second charge stop request, the main controller 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 required power so that the battery pack is at rest.

[0180] After receiving the second charge stop request from the battery manager, the main controller can determine that the battery pack is fully charged and 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 power output of the power generation module to ensure that the power output of the power generation module is equal to the system power requirement, thereby allowing the battery pack to rest.

[0181] Optionally, if the output power of the power generation module is greater than the system required power, the main controller may reduce the output power of the power generation module so that the output power of the power generation module is equal to the system required power.

[0182] While the battery pack is at rest, it doesn't charge or discharge. This eliminates the polarization caused by charging, ensuring the battery manager's accurate determination of the battery pack's available capacity. Therefore, while the battery pack is at rest, the main controller can control the power generation module to curtail power, ensuring that the module's output power meets the system's required power. In other words, the module's output power can be controlled to equal the system's required power.

[0183] Step 512: After the battery pack is charged and discharged, 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.

[0184] The specific implementation of step 512 can refer to the above step 412, and will not be repeated here in this embodiment of the present disclosure.

[0185] Step 513: The battery manager sends the SOH value of the battery pack to the main controller.

[0186] The specific implementation of step 513 can refer to the above step 413, and will not be repeated here in this embodiment of the present disclosure.

[0187] In summary, the disclosed embodiments provide a method for detecting SOH, in which a main controller adjusts the output power of the power generation module based on the battery pack's allowable charge and discharge power, ensuring that the module's output power meets the system's required power while simultaneously charging and discharging the battery pack. This allows the battery pack to complete a complete charge or discharge cycle, accurately determining the battery pack's current available capacity and enabling precise calculation of the SOH.

[0188] Furthermore, by allowing the battery pack to rest after charging and discharging, polarization caused by discharging and charging is eliminated, thereby accurately determining the battery pack's current available capacity and enabling precise SOH calculation. This effectively addresses the issue of reduced SOH detection accuracy caused by the OCV-SOC relationship curve after battery pack aging, providing accurate data for energy storage batteries over a 20-25 year lifespan, significantly impacting battery management system algorithms and strategies.

[0189] An embodiment of the present disclosure provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a computer device, the computer device implements the SOH detection method shown in any one of FIG. 2 to FIG. 5 .

[0190] FIG6 is a schematic structural diagram of a main controller 40 in an energy storage system provided by an embodiment of the present disclosure. As shown in FIG6 , the main controller 40 includes a memory 41 and a processor 42. The memory 41 stores a computer program. When the computer program is executed by the processor 42, the main controller 40 implements the SOH detection method shown in FIG2 , FIG4 and FIG5 .

[0191] Figure 7 is a structural diagram of a battery manager 31 of a battery pack in an energy storage system provided by an embodiment of the present disclosure, which includes a memory 311 and a processor 312. The memory 311 stores a computer program. When the computer program is executed by the processor 312, the battery manager 31 implements the SOH detection method shown in Figures 3 to 4 above.

[0192] FIG8 is a block diagram of an SOH detection device provided by an embodiment of the present disclosure, which is applied to the main controller 40 of the energy storage system shown in FIG1 . As shown in FIG8 , the device includes:

[0193] The first determination module 801 is configured to send an SOH detection instruction to a battery manager of a battery pack in an energy storage system, wherein the SOH detection instruction is configured to instruct the battery manager to determine the allowable charge and discharge power of the battery pack.

[0194] The first receiving module 802 is configured to receive the allowed charge and discharge power sent by the battery manager.

[0195] The first charge and discharge control module 803 is used to adjust the output power of the power generation module in the energy storage system according to the charge and discharge allowed power, so that the output power of the power generation module can charge and discharge the battery pack while meeting the system demand power.

[0196] The second receiving module 804 is further configured 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 is charged and discharged.

[0197] Optionally, the first charge and discharge control module 803 is used to send the first charging power of the battery pack determined according to the allowed charge and discharge power to the battery manager to instruct the battery manager to control the charging of the battery pack 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 required power.

[0198] Upon receiving the first charge stop request sent by the battery manager, controlling the power generation module to stop charging the battery pack;

[0199] The first discharge power of the battery pack determined according to the allowed charge and discharge power is sent to the battery manager to instruct the battery manager to control the discharge of the battery pack 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.

[0200] When the first discharge stop request sent by the battery manager is received, the battery pack is controlled to stop discharging.

[0201] Optionally, the first charge and discharge control module 803 is further configured to control the output power of the power generation module to be equal to the system required power after controlling the power generation module to stop charging the battery pack, so as to allow the battery pack to rest.

[0202] Optionally, the first charge and discharge control module 803 is further configured to control the output power of the power generation module to be equal to the system required power after controlling the battery pack to stop discharging, so as to allow the battery pack to rest.

[0203] Optionally, the first charge and discharge control module 803 is configured to:

[0204] The second discharge power of the battery pack determined according to the charge and discharge allowed power is sent to the battery manager to instruct the battery manager to control the discharge of the battery pack 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.

[0205] upon receiving a second discharge stop request sent by the battery manager, controlling the battery pack to stop discharging;

[0206] The second charging power of the battery pack determined according to the allowed charge and discharge power is sent to the battery manager to instruct the battery manager to control the charging of the battery pack 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.

[0207] When the second charging stop request sent by the battery manager is received, the power generation module is controlled to stop charging the battery pack.

[0208] Optionally, the first charge and discharge control module 803 is further configured to control the output power of the power generation module to be equal to the system required power after controlling the battery pack to stop discharging, so as to allow the battery pack to rest.

[0209] Optionally, the first charge and discharge control module 803 is further configured to control the output power of the power generation module to be equal to the system required power after controlling the power generation module to stop charging the battery pack, so as to allow the battery pack to rest.

[0210] The first determining module 801 is configured to send an SOH detection instruction to a battery manager of a battery pack in an energy storage system when it is determined that the output power of the power generation module is greater than the system required power and the duration is greater than or equal to a preset SOH detection duration.

[0211] In summary, the embodiments of the present disclosure provide an SOH detection device, 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 power requirements of the system, thereby enabling the battery pack to complete a complete charging or discharging condition, thereby obtaining the current accurate available capacity of the battery pack and realizing accurate calculation of the SOH.

[0212] FIG9 is a block diagram of another SOH detection device provided by an embodiment of the present disclosure, which is applied to the battery manager 31 of the battery pack in the energy storage system shown in FIG1 . As shown in FIG9 , the device includes:

[0213] The second determination module 901 is configured to determine the allowable charge and discharge power of the battery pack in response to an SOH detection instruction sent by a main controller of the energy storage system.

[0214] The sending module 902 is used to send the allowed charge and discharge 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 allowed charge and discharge power, thereby making the output power of the power generation module charge and discharge the battery pack while meeting the system's required power.

[0215] The detection module 903 is used to determine the available capacity of the battery pack after the battery pack is charged and discharged, and calculate the SOH value of the battery pack based on the available capacity.

[0216] Optionally, as shown in FIG10 , the device may further include a second charge and discharge control module 904 for:

[0217] The battery pack is charged according to a 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 system demand power.

[0218] After determining 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.

[0219] The battery pack is controlled to discharge according to a first discharge power sent by the main controller, wherein the first discharge power is equal to the difference between the system demand power and the output power of the power generation module.

[0220] After determining that the battery pack is fully discharged, a first discharge stop request is sent to the main controller to instruct the main controller to control the battery pack to stop discharging.

[0221] Optionally, the first charge 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 required power after controlling the power generation module to stop charging the battery pack, so as to allow the battery pack to be stationary.

[0222] Optionally, 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 required power after controlling the battery pack to stop discharging, so that the battery pack can be put into rest.

[0223] Optionally, as shown in FIG10 , the second charge and discharge control module 904 is configured to:

[0224] The battery pack will be controlled to discharge according to the second discharge power sent by the main controller, wherein the second discharge power is equal to the difference between the system demand power and the output power of the power generation module.

[0225] After determining that the battery pack is fully discharged, a second discharge stop request is sent to the main controller to instruct the main controller to control the battery pack to stop discharging.

[0226] The battery pack is charged according to the second charging power sent by the main controller, wherein the second charging power is equal to the difference between the output power of the power generation module and the system demand power.

[0227] After determining 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.

[0228] Optionally, the second charge 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 required power after controlling the power generation module to stop charging the battery pack, so as to allow the battery pack to be stationary.

[0229] Optionally, 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 required power after controlling the battery pack to stop discharging, so that the battery pack can be put into rest.

[0230] Optionally, the SOH detection instruction 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 time.

[0231] In summary, the disclosed embodiments provide a state of health (SOH) detection device. In this device, after a battery manager sends the allowed charge and discharge power to a main controller, it can instruct the main controller to adjust the output power of the power generation module based on the allowed charge and discharge power. This ensures that the output power of the power generation module meets the system's required power while simultaneously charging and discharging the battery pack, thereby enabling the battery pack to complete a complete charge or discharge cycle. This allows the battery manager to obtain the battery pack's current and accurate available capacity, enabling precise calculation of the SOH value.

[0232] 1 , the main controller 40 in the energy storage system provided by the embodiment of the present disclosure is further configured to send the allowed charge and discharge 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 required power.

[0233] The battery manager 31 is further configured to control the charging of the battery pack according to the first charging power, and send a first charging stop request to the main controller 40 when it is determined that the battery pack is fully charged.

[0234] The main controller 40 is also used to control the power generation module to stop charging the battery pack when receiving the first charging stop request sent by the battery manager 31, and to send the first discharge power to the battery manager 31 when determining the first discharge power of the battery pack based on the allowed charge and 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.

[0235] The battery manager 31 is further configured 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 is fully discharged.

[0236] The main controller 40 is further configured to control the battery pack to stop discharging upon receiving the first discharge stop request sent by the battery manager 31 .

[0237] 1 , the main controller 40 is further configured to control the output power of the power generation module to be equal to the system required power after controlling the power generation module to stop charging the battery pack, so as to allow the battery pack to rest.

[0238] 1 , the main controller 40 is further configured to, after controlling the battery pack to stop discharging, control the output power of the power generation module to be equal to the system required power, so that the battery pack can be at rest.

[0239] 1 , the main controller 40 is further configured to determine a second discharge power of the battery pack based on the allowed 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 required power and the output power of the power generation module.

[0240] The battery manager 31 is further configured to control the battery pack to discharge according to the second discharge power, and send a second discharge stop request to the main controller 40 after determining that the battery pack is fully discharged.

[0241] The main controller 40 is also used to control the battery pack to stop discharging when receiving a second discharge stop request sent by the battery manager 31, and when determining the second charging power of the battery pack based on the allowed charging and discharging power, send the second charging power to the battery manager 31, wherein the second charging power is equal to the difference between the output power of the power generation module and the system required power.

[0242] The battery manager 31 is further configured to control the battery pack to be charged according to the second charging power, and to send a second charge stop request to the main controller 40 after determining that the battery pack is fully charged.

[0243] The main controller 40 is further configured to control the power generation module to stop charging the battery pack upon receiving a second charge stop request sent by the battery manager 31 .

[0244] 1 , the main controller 40 is further configured to, after controlling the battery pack to stop discharging, control the output power of the power generation module to be equal to the system required power, so that the battery pack can be at rest.

[0245] 1 , the main controller 40 is further used to, after controlling the power generation module to stop charging the battery pack, control the output power of the power generation module to be equal to the system required power so that the battery pack can be at rest.

[0246] 1 , the main controller 40 is further configured to send an SOH detection instruction to the battery manager of the battery pack in the energy storage system when it determines that the output power of the power generation module is greater than the system required power and the duration is greater than or equal to the preset SOH detection duration.

[0247] In summary, the disclosed embodiments provide an energy storage system in which a main controller adjusts the output power of the power generation module based on the battery pack's allowable charge and discharge power, ensuring that the module's output power meets the system's power requirements while simultaneously charging and discharging the battery pack. This allows the battery pack to complete a complete charge or discharge cycle, accurately determining the battery pack's current available capacity and enabling precise calculation of the SOH.

[0248] It should be noted that the logic and / or steps represented in the flowcharts or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing the logical functions, and can be embodied in any computer-readable medium for use by an instruction execution system, apparatus, or device (such as a computer-based system, a system including a processor, or other system that can fetch and execute instructions from an instruction execution system, apparatus, or device), or in conjunction with such instruction execution system, apparatus, or device. For the purposes of this specification, a "computer-readable medium" can be any device that can contain, store, communicate, propagate, or transmit a program for use by an instruction execution system, apparatus, or device, or in conjunction with such instruction execution system, apparatus, or device. More specific examples (non-exhaustive list) of computer-readable media include the following: an electrical connection portion having one or more wires (electronic device), a portable computer disk cartridge (magnetic device), random access memory (RAM), read-only memory (ROM), erasable and programmable read-only memory (EPROM or flash memory), fiber optic devices, and portable compact disc read-only memory (CDROM). Furthermore, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium and then editing, interpreting or processing it in another suitable manner if necessary, and then storing it in a computer memory.

[0249] It should be understood that various parts of the present 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 a memory and executed by a suitable instruction execution system. For example, if implemented using hardware, as in another embodiment, any one of the following technologies known in the art or a combination thereof can be used to implement: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application-specific integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0250] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, schematic representations 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 any one or more embodiments or examples.

[0251] In the description of the present disclosure, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation to the present disclosure.

[0252] In addition, the terms "first" and "second" used in the embodiments of the present disclosure are only used for descriptive purposes and should not be understood as indicating or implying relative importance, or implicitly indicating the number of technical features indicated in the embodiments. Therefore, the features defined in the embodiments of the present disclosure with terms such as "first" and "second" can explicitly or implicitly indicate that the embodiment includes at least one such feature. In the description of the present disclosure, the word "plurality" means at least two or two or more, such as two, three, four, etc., unless otherwise clearly and specifically defined in the embodiments.

[0253] In this disclosure, unless otherwise clearly specified or limited in the embodiments, the terms "installed," "connected," "connect," and "fixed" appearing in the embodiments should be understood in a broad sense. For example, the connection can be a fixed connection, a detachable connection, or an integral connection. 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 elements, or the interaction between two elements. For those skilled in the art, the specific meanings of the above terms in this disclosure can be understood based on the specific implementation.

[0254] In the present disclosure, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0255] Although the embodiments of the present disclosure have been shown and described above, it is understood that the above embodiments are illustrative and are not to be construed as limitations on the present disclosure. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present disclosure.

Claims

1. A SOH detection method, characterized in that: Applied to a main controller of an energy storage system, the method comprises: Sending a SOH detection instruction to a battery manager of a battery pack in the energy storage system, wherein the SOH detection instruction is used to instruct the battery manager to determine the allowable charge and discharge power of the battery pack; receiving the charge and discharge allowable power sent by the battery manager, and adjusting the output power of the power generation module in the energy storage system according to the charge and discharge allowable power, so that the output power of the power generation module can charge and discharge the battery pack while meeting the system power requirement; 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 is charged and discharged.

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 charge and discharge allowable power includes: sending a first charging power of the battery pack determined according to the allowed charge and discharge power to the battery manager, to instruct the battery manager to control charging of the battery pack 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 required power; Upon receiving a first charge stop request sent by the battery manager, controlling the power generation module to stop charging the battery pack; sending a first discharge power of the battery pack determined according to the charge and discharge allowed power to the battery manager, to instruct the battery manager to control the battery pack to discharge according to the first discharge power, where the first discharge power is equal to the difference between the system required power and the output power of the power generation module; Upon receiving the first discharge stop request sent by the battery manager, the battery pack is controlled to stop discharging.

3. The SOH detection method according to claim 2, characterized in that: The output power of the power generation module in the energy storage system is adjusted according to the charge and discharge allowed power, further comprising: 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 system required power, so that the battery pack is at rest.

4. The SOH detection method according to claim 2, characterized in that: The output power of the power generation module in the energy storage system is adjusted according to the charge and discharge allowed power, further comprising: After controlling the battery pack to stop discharging, the output power of the power generation module is controlled to be equal to the system required power, so that the battery pack is at rest.

5. 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 charge and discharge allowable power includes: sending a second discharge power of the battery pack determined according to the charge and discharge allowed power 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 sent by the battery manager, controlling the battery pack to stop discharging; sending a second charging power of the battery pack determined according to the allowed charge and discharge power to the battery manager, to instruct the battery manager to control charging of the battery pack 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; When receiving the second charging stop request sent by the battery manager, the power generation module is controlled to stop charging the battery pack.

6. The SOH detection method according to claim 5, characterized in that: The output power of the power generation module in the energy storage system is adjusted according to the charge and discharge allowed power, further comprising: After controlling the battery pack to stop discharging, the output power of the power generation module is controlled to be equal to the system required power, so that the battery pack is at rest.

7. The SOH detection method according to claim 5, characterized in that: The output power of the power generation module in the energy storage system is adjusted according to the charge and discharge allowed power, further comprising: 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 system required power, so that the battery pack is at rest.

8. The SOH detection method according to any one of claims 1 to 7, characterized in that: Sending a SOH detection instruction to a battery manager of a battery pack in the energy storage system includes: When it is determined that the output power of the power generation module is greater than the system required power and the duration is greater than or equal to the preset SOH detection time, an SOH detection instruction is sent to the battery manager of the battery pack in the energy storage system.

9. A SOH detection method, characterized in that: A battery manager for a battery pack in an energy storage system, the method comprising: In response to a SOH detection instruction sent by a main controller of the energy storage system, determining the allowable charge and discharge power of the battery pack; Sending the charge and discharge allowable power to the main controller, so that the main controller adjusts the output power of the power generation module in the energy storage system according to the charge and discharge allowable power, thereby making the output power of the power generation module charge and discharge the battery pack while meeting the system power requirement; After the battery pack is charged and discharged, the available capacity of the battery pack is determined, and the SOH value of the battery pack is calculated based on the available capacity.

10. The SOH detection method according to claim 9, characterized in that: Charging and discharging the battery pack, comprising: Controlling the battery pack to charge according to a 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 system required power; After determining that the battery pack is fully charged, sending a first charge stop request to the main controller, instructing the main controller to control the power generation module to stop charging the battery pack; controlling the battery pack to discharge according to a first discharge power sent by the main controller, wherein the first discharge power is equal to the difference between the system demand power and the output power of the power generation module; After determining that the battery pack is fully discharged, a first discharge stop request is sent to the main controller to instruct the main controller to control the battery pack to stop discharging.

11. The SOH detection method according to claim 10, characterized in that: The first charge 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 required power after controlling the power generation module to stop charging the battery pack, so as to allow the battery pack to be stationary.

12. The SOH detection method according to claim 10, characterized in that: 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 required power after controlling the battery pack to stop discharging, so as to allow the battery pack to be stationary.

13. The SOH detection method according to claim 9, characterized in that: Charging and discharging the battery pack, comprising: controlling the battery pack to discharge according to a second discharge power sent by the main controller, wherein the second discharge power is equal to the difference between the system demand power and the output power of the power generation module; After determining that the battery pack is fully discharged, sending a second discharge stop request to the main controller to instruct the main controller to control the battery pack to stop discharging; Controlling the battery pack to charge according to a second charging power sent by the main controller, wherein the second charging power is equal to the difference between the output power of the power generation module and the system required power; After determining that the battery pack is fully charged, a second charge stop request is sent to the main controller, instructing the main controller to control the power generation module to stop charging the battery pack.

14. The SOH detection method according to claim 13, characterized in that: The second charge 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 required power after controlling the power generation module to stop charging the battery pack, so as to allow the battery pack to be stationary.

15. The SOH detection method according to claim 13, characterized in that: 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 required power after controlling the battery pack to stop discharging, so as to allow the battery pack to be stationary.

16. The SOH detection method according to any one of claims 9 to 15, characterized in that: The SOH detection instruction is sent by the main controller when it determines that the output power of the power generation module is greater than the system required power and the duration is greater than or equal to the preset SOH detection duration.

17. A computer-readable storage medium, characterized in that The computer-readable storage medium stores a computer program, and when the computer program is executed by a computer device, the computer device implements the SOH detection method according to any one of claims 1 to 8 or the SOH detection method according to any one of claims 9 to 16.

18. A main controller of an energy storage system, characterized in that: The main controller comprises a memory and a processor, wherein the memory stores a computer program, and when the computer program is executed by the processor, the main controller implements the SOH detection method according to any one of claims 1 to 8.

19. A battery manager for a battery pack in an energy storage system, characterized in that: The battery manager comprises a memory and a processor, wherein the memory stores a computer program, and when the computer program is executed by the processor, the battery manager implements the SOH detection method according to any one of claims 9 to 16.

20. An energy storage system, characterized in that: The system comprises a power generation module, an energy conversion module, a battery pack and a main controller. The energy conversion module is used to convert the electric energy generated by the power generation module to charge the battery pack and / or supply power to the outside, or to convert the electric energy provided by the battery pack to supply power to the outside, wherein: The main controller is configured to send an SOH detection instruction to the battery manager in the battery pack; The battery manager is configured to determine the allowable charge and discharge power of the battery pack upon receiving the SOH detection instruction, and send the allowable charge and discharge power to the main controller; The main controller is further configured to adjust the output power of the power generation module according to the charge and discharge allowed power, so that the output power of the power generation module, when converted by the energy conversion module, meets the system power requirement for external power supply and the charge and discharge power for charging and discharging the battery pack; The battery manager is further configured to determine the available capacity of the battery pack after the battery pack is 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.

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