Energy storage system and charging and discharging control method and device thereof

Abstract

The invention discloses an energy storage system and a charging and discharging control method and device thereof, and relates to the technical field of energy storage batteries. The energy storage system comprises a battery module, a photovoltaic charging module and an inverter module, a battery management module is configured in the battery module, and the battery module is electrically connected with the photovoltaic charging module and the inverter module; the charging and discharging control method comprises the following steps: acquiring the operating temperature, the residual electric quantity and the charging and discharging current of the battery module, the photovoltaic power supply voltage of the photovoltaic charging module and the alternating current power supply voltage of the inverter module in real time; determining the current charging condition type of the battery module according to the current operation conditions of the battery module, the photovoltaic charging module and the inverter module; when the battery module is in the recoverable abnormal charging working condition, the battery management module controls the battery module to stop charging and discharging, and when it is detected that the battery module recovers to the normal charging working condition, the battery management module controls the battery module to start charging and discharging. According to the invention, the safety and control flexibility of the energy storage system are improved.

Description

Technical Field

[0001] This invention relates to the field of energy storage battery technology, and in particular to an energy storage system and its charging and discharging control method and device. Background Technology

[0002] With the development of new energy technologies, energy storage systems, as an important link connecting the power generation side and the power consumption side, are widely used in scenarios such as home backup power and photovoltaic energy storage, playing an important role in improving energy use flexibility and promoting the utilization of renewable energy.

[0003] Current energy storage systems typically use lithium-ion battery modules as energy carriers and employ a Battery Management System (BMS) to monitor and control the charging and discharging process to prevent overcharging and over-discharging. A common over-discharge protection method involves the BMS automatically cutting off the discharge path when the battery voltage drops to a set threshold, thereby extending battery life.

[0004] However, under certain special operating conditions, such as when the battery has zero remaining power and the energy storage system detects that the charger is connected, but the battery cannot be truly charged due to reasons such as low ambient temperature, insufficient photovoltaic light, or system hardware failure, the BMS will keep the battery's charging and discharging path open, causing the battery to continuously discharge with a small current, which may eventually lead to severe battery depletion and premature scrapping. Summary of the Invention

[0005] This invention provides an energy storage system and its charging and discharging control method and device. Based on the abnormal charging conditions of the battery module, the control strategy is dynamically adjusted to realize the timely stopping or resumption of the charging and discharging of the battery module, thereby improving the safety and control flexibility of the energy storage system.

[0006] The first aspect of this invention provides a charging and discharging control method for an energy storage system. The energy storage system includes a battery module, a photovoltaic charging module, and an inverter module. The battery module is equipped with a battery management module for controlling the charging and discharging state of the battery module. The battery module is electrically connected to both the photovoltaic charging module and the inverter module. The charging and discharging control method for the energy storage system includes:

[0007] The operating conditions of the battery module, the photovoltaic charging module, and the inverter module are acquired in real time. The operating conditions of the battery module include operating temperature, remaining power, and charging / discharging current. The operating conditions of the photovoltaic charging module include photovoltaic power supply voltage. The operating conditions of the inverter module include AC power supply voltage.

[0008] Based on the current operating conditions of the battery module, the photovoltaic charging module, and the inverter module, determine the current charging condition type of the battery module;

[0009] When the current charging condition of the battery module is a recoverable abnormal charging condition, the battery management module controls the battery module to stop charging and discharging. When the current charging condition of the battery module is detected to have recovered to a normal charging condition, the battery management module controls the battery module to start charging and discharging.

[0010] Optionally, the recoverable abnormal charging conditions include abnormal temperature conditions;

[0011] Based on the current operating conditions of the battery module, the photovoltaic charging module, and the inverter module, the current charging condition type of the battery module is determined, including:

[0012] When the current operating conditions of the battery module, the photovoltaic charging module, and the inverter module meet the first preset conditions, the current charging condition type of the battery module is determined to be the abnormal temperature condition; the first preset conditions include at least one of the current photovoltaic charging voltage of the photovoltaic charging module and the current AC power supply voltage of the inverter module being greater than zero, the current operating temperature of the battery module exceeding the normal charging temperature threshold range, and the current remaining power of the battery module being zero.

[0013] Optionally, if the current charging condition of the battery module is under the abnormal temperature condition, before controlling the battery module to start charging and discharging through the battery management module when the current charging condition of the battery module is detected to have returned to the normal charging condition, the method further includes:

[0014] The ambient temperature of the environment in which the battery module is located is obtained in real time;

[0015] When the current ambient temperature of the environment where the battery module is located is within the normal charging temperature threshold range, the current charging condition of the battery module is determined to be restored to the normal charging condition.

[0016] Optionally, if the current charging condition of the battery module is under the abnormal temperature condition, after detecting that the current charging condition of the battery module has returned to the normal charging condition, and after controlling the battery module to start charging and discharging through the battery management module, the method further includes:

[0017] The operating temperature of the battery module is acquired in real time.

[0018] When the current operating temperature of the battery module exceeds the normal charging temperature threshold range, the battery management module controls the battery module to stop charging and discharging.

[0019] Optionally, the recoverable abnormal charging conditions include abnormal photovoltaic charging conditions;

[0020] Determining the current charging condition type of the battery module based on the current operating conditions of the battery module, the photovoltaic charging module, and the inverter module further includes:

[0021] When the battery module is in a charging state, the current integrated value of the charging current of the battery module is determined based on the charging current of the battery module.

[0022] When the battery module is in a discharging state, the current integral value of the battery module's discharge current is determined based on the battery module's discharge current.

[0023] When the current remaining power of the battery module, the current photovoltaic charging voltage of the photovoltaic charging module, the current AC supply voltage of the inverter module, the current charging current integral, and the current discharging current integral satisfy a second preset condition, the current charging condition of the battery module is determined to be the abnormal photovoltaic charging condition. The second preset condition includes the current remaining power of the battery module being zero, the current photovoltaic charging voltage of the photovoltaic charging module being greater than zero, the current AC supply voltage of the inverter module being zero, and the current charging current integral being zero, and / or the current discharging current integral being greater than the current charging current integral.

[0024] Optionally, if the current charging condition of the battery module is under the abnormal photovoltaic charging condition, before controlling the battery module to start charging and discharging through the battery management module when the current charging condition of the battery module is detected to have returned to the normal charging condition, the following steps are also included:

[0025] When the battery module stops charging and discharging under the control of the battery management module, the current photovoltaic power supply voltage of the photovoltaic charging module is determined as the first photovoltaic power supply voltage;

[0026] The photovoltaic power supply voltage of the photovoltaic charging module and the AC power supply voltage of the inverter module are acquired in real time.

[0027] When the current photovoltaic power supply voltage of the photovoltaic charging module and the current AC power supply voltage of the inverter module meet the third preset condition, the current charging condition of the battery module is determined to be restored to the normal charging condition; the third preset condition includes the voltage difference between the current photovoltaic power supply voltage and the first photovoltaic power supply voltage being greater than a preset voltage difference threshold, and / or the current AC power supply voltage being greater than zero.

[0028] Optionally, if the current charging condition of the battery module is under abnormal photovoltaic charging conditions, after detecting that the current charging condition of the battery module has returned to normal charging conditions, and the battery management module controls the battery module to start charging and discharging, the method further includes:

[0029] When the battery module is in a charging state, the current integrated value of the charging current of the battery module is determined based on the charging current of the battery module.

[0030] When the battery module is in a discharging state, the current integral value of the battery module's discharge current is determined based on the battery module's discharge current.

[0031] When the integral of the current discharge current is greater than the integral of the current charging current, the battery management module controls the battery module to stop charging and discharging.

[0032] Optionally, the charging and discharging control method for the energy storage system further includes:

[0033] When the current charging condition of the battery module is an unrecoverable charging abnormal condition, the battery management module controls the battery module to stop charging and discharging.

[0034] Optionally, determining the current charging condition type of the battery module based on the current operating conditions of the battery module, the photovoltaic charging module, and the inverter module further includes:

[0035] When it is determined that at least one of the battery module, the photovoltaic charging module, and the inverter module has an operational fault based on the current operating conditions of the battery module, the photovoltaic charging module, and the inverter module, the current charging condition type of the battery module is determined to be the unrecoverable charging abnormal condition.

[0036] Optionally, the energy storage system further includes an alarm module; the charging and discharging control method of the energy storage system further includes:

[0037] When the current charging condition of the battery module is the unrecoverable charging abnormal condition, it is determined whether the current photovoltaic power supply voltage of the photovoltaic charging module and the current AC power supply voltage of the inverter module meet the fourth preset condition; the fourth preset condition includes that at least one of the current photovoltaic power supply voltage and the current AC power supply voltage is greater than zero.

[0038] If so, the battery management module controls the battery module to stop charging and discharging, and controls the alarm module to display fault information;

[0039] If not, the alarm module will continue to display fault information for a preset time, and then the battery management module will control the battery module to stop charging and discharging.

[0040] A second aspect of the present invention provides a charging and discharging control device, wherein the energy storage system includes a battery module, a photovoltaic charging module, and an inverter module, wherein the battery module is equipped with a battery management module for controlling the charging and discharging state of the battery module, and the battery module is electrically connected to the photovoltaic charging module and the inverter module respectively; the charging and discharging control device of the energy storage system includes:

[0041] The operating condition acquisition module is used to acquire the operating conditions of the battery module, the photovoltaic charging module, and the inverter module in real time. The operating conditions of the battery module include operating temperature, remaining power, and charging / discharging current. The operating conditions of the photovoltaic charging module include photovoltaic power supply voltage. The operating conditions of the inverter module include AC power supply voltage.

[0042] The charging condition type determination module is used to determine the current charging condition type of the battery module based on the current operating conditions of the battery module, the photovoltaic charging module, and the inverter module.

[0043] The battery module control module is used to control the battery module to stop charging and discharging when the current charging condition of the battery module is a recoverable charging abnormal condition, and to control the battery module to start charging and discharging when the current charging condition of the battery module is detected to be restored to the normal charging condition.

[0044] A third aspect of the present invention provides an energy storage system, the energy storage system comprising: a battery module, a photovoltaic charging module, an inverter module, and a controller;

[0045] The battery module is equipped with a battery management module for controlling the charging and discharging state of the battery module. The battery module is electrically connected to the photovoltaic charging module and the inverter module respectively.

[0046] The controller is connected to the battery module, the photovoltaic charging module, and the inverter module respectively, and is used to execute the charging and discharging control method of the energy storage system as described above.

[0047] The technical solution of this invention acquires the operating conditions of the battery module, photovoltaic charging module, and inverter module in real time. Based on the battery module's current operating temperature, remaining charge, and current charging / discharging current, the current photovoltaic supply voltage of the photovoltaic charging module, and the current AC supply voltage of the inverter module, the current charging condition type of the battery module can be determined. When the current charging condition type of the battery module is a recoverable charging anomaly, the battery management module controls the battery module to stop charging and discharging. This prevents the battery module from continuously discharging with a small current, avoiding over-discharge faults, extending the battery module's lifespan, and improving the safety and control flexibility of the energy storage system. Furthermore, when the current charging condition type of the battery module is detected to have recovered to a normal charging condition, the battery management module controls the battery module to start charging and discharging, enhancing the energy storage system's adaptability in complex environments, reducing downtime, and improving energy utilization efficiency.

[0048] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0049] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0050] Figure 1 This is a schematic diagram of the structure of an energy storage system provided in Embodiment 1 of the present invention;

[0051] Figure 2 This is a schematic flowchart of a charging and discharging control method for an energy storage system provided in Embodiment 2 of the present invention;

[0052] Figure 3 This is a schematic flowchart of a charging and discharging control method for an energy storage system provided in Embodiment 3 of the present invention;

[0053] Figure 4 This is a schematic flowchart of a charging and discharging control method for an energy storage system provided in Embodiment 4 of the present invention;

[0054] Figure 5 This is a schematic flowchart of a charging and discharging control method for an energy storage system provided in Embodiment 5 of the present invention;

[0055] Figure 6This is a schematic diagram of the structure of a charging and discharging control device for an energy storage system provided in Embodiment Six of the present invention. Detailed Implementation

[0056] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0057] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0058] Example 1

[0059] Figure 1 This is a schematic diagram of an energy storage system provided in Embodiment 1 of the present invention. Figure 1 As shown, the energy storage system includes a battery module 1, a photovoltaic charging module 2, an inverter module 3, and a controller 4. The battery module 1 is equipped with a battery management module 01 for controlling the charging and discharging state of the battery module. The battery module 1 is electrically connected to the photovoltaic charging module 2 and the inverter module 3 respectively. The controller 4 is connected to the battery module 1, the photovoltaic charging module 2, and the inverter module 3 respectively.

[0060] Specifically, battery module 1 is used to store electrical energy and release it when the load needs power. Battery module 1 can be understood as a battery pack composed of multiple individual batteries, such as lithium-ion batteries, lead-acid batteries, or nickel-metal hydride batteries, connected in series. Battery module 1 is equipped with a battery management module 01 for controlling the charging and discharging state of the battery module. Battery management module 01 may include a BMS, which can monitor the operating voltage, operating current, state of charge (SOC), and temperature of battery module 1 to achieve safety protection and real-time data acquisition and calculation for battery module 1.

[0061] Specifically, battery module 1 is electrically connected to photovoltaic charging module 2 and inverter module 3. Photovoltaic charging module 2 can be connected to a photovoltaic power generation terminal, enabling it to adjust the photovoltaic power supply voltage provided by the photovoltaic power generation terminal to a voltage suitable for charging battery module 1, thus providing photovoltaic power to battery module 1. Inverter module 3 is used to convert DC power to AC power, or vice versa, so that it can charge battery module 1 through an external AC power supply terminal, or supply power to an external load through battery module 1. For example, inverter module 3 can be connected to an external AC power supply terminal, such as a mains power supply terminal, so that it can adjust the AC power supply voltage provided by the mains power supply terminal to a voltage suitable for charging battery module 1, thus providing AC power to battery module 1. Inverter module 3 can also be connected to an electrical load, so that it can also convert the DC power from battery module 1 to AC power, thereby enabling battery module 1 to supply power to an external load. The photovoltaic charging module 2 and inverter module 3 enable bidirectional power flow, making the energy storage system suitable for different application scenarios and improving energy utilization efficiency.

[0062] In addition, battery module 1 is equipped with independent charging power transistors 51 and discharging power transistors 52, which are electrically connected to photovoltaic charging module 2 and inverter module 3 respectively. This allows battery management module 01 to control the charging and discharging paths of battery module 1 by controlling the on / off states of charging power transistors 51 and discharging power transistors 52, thereby enabling charge and discharge management of battery module 1 in the energy storage system. For example, both charging power transistors 51 and discharging power transistors 52 can be N-type MOSFETs. The source of charging power transistor 51 can be electrically connected to battery module 1, and the drain of charging power transistor 51 can be electrically connected to the drain of discharging power transistor 52. The source of discharging power transistor 52 can be electrically connected to photovoltaic charging module 2 and inverter module 3 respectively, thus forming a unidirectional conduction path. When the charging power transistor 51 is turned on, the energy storage system allows the external power supply to charge the battery module 1 through the photovoltaic charging module 2 and / or the inverter module 3; when the discharging power transistor 52 is turned on, the energy storage system allows the battery module 1 to supply power to the external load through the inverter 2; when both the charging power transistor 51 and the discharging power transistor 52 are turned off, the battery module 1 can neither be charged nor discharged. The charging power transistor 51 and the discharging power transistor 52 can independently control the charging and discharging paths of the battery module 1 to avoid reverse current and enhance the safety of the energy storage system.

[0063] It is understandable that when battery module 1 has been discharged to a SOC value of 0, if battery management module 01 determines that there is photovoltaic power supply voltage and / or AC power supply voltage, even if these input power supply voltages are insufficient to allow battery module 1 to complete actual charging, battery management module 01 may still default to maintaining the charging and discharging path of battery module 1 in a conductive state. This will cause battery module 1 to continue discharging with a small current, which may eventually lead to severe depletion and premature failure of battery module 1. Therefore, it is necessary to connect controller 4 to battery module 1, photovoltaic charging module 2, and inverter module 3 respectively, so that controller 4 can obtain the operating conditions of battery module 1, photovoltaic charging module 2, and inverter module 3 in real time. This allows controller 4 to promptly control battery management module 01 to cut off the charging and discharging path of battery module 1 when it identifies the current charging condition of battery module 1 as an abnormal charging condition, thereby avoiding over-discharge faults of battery module 1 and extending the service life of battery module 1.

[0064] Optional, continue to refer to Figure 1 The energy storage system also includes an alarm module 6. When the controller 4 determines that the current charging condition of the battery module 1 is an unrecoverable charging abnormal condition, the alarm module 6 can be controlled to display fault information. For example, the alarm module 6 can display a fault in the energy storage system on a screen, or the alarm module 6 can send the fault information of the energy storage system to a remote terminal, such as a mobile phone or tablet, via a wireless communication module for text or voice prompts and warnings.

[0065] It is also understood that the controller 4 in the energy storage system can execute the charging and discharging control method of the energy storage system provided in the embodiments of the present invention, and has the corresponding functional modules and beneficial effects of the method. For technical details not described in detail in this embodiment, please refer to the charging and discharging control method of the energy storage system described in the following embodiments.

[0066] Example 2

[0067] Figure 2 This is a flowchart illustrating a charging and discharging control method for an energy storage system according to Embodiment 2 of the present invention. This method can be executed by a controller within the energy storage system to prevent over-discharge faults in the battery module. Correspondingly, as... Figure 2 As shown, the charging and discharging control method of this energy storage system may include:

[0068] S101: Real-time acquisition of the operating status of the battery module, photovoltaic charging module, and inverter module.

[0069] The operating conditions of the battery module include operating temperature, remaining power, and charging / discharging current; the operating conditions of the photovoltaic charging module include photovoltaic power supply voltage; and the operating conditions of the inverter module include AC power supply voltage.

[0070] Specifically, to determine the current charging condition of the battery module, the controller can acquire the real-time operating conditions of the battery module, photovoltaic charging module, and inverter module. For example, the battery management module configured in the battery module can detect the operating temperature of the battery module in real time using a temperature sensor, obtain the remaining battery capacity using a real-time SOC calculation module, and acquire the charging and discharging current of the battery module using a current sampling circuit. This data can be provided to the controller, enabling the controller to acquire the real-time operating conditions of the battery module. The controller can also acquire the real-time photovoltaic supply voltage received by the photovoltaic charging module using a voltage sampling circuit in the photovoltaic charging module, and the real-time AC supply voltage received by the inverter module using an AC detection circuit in the inverter module.

[0071] S102. Determine the current charging condition type of the battery module based on the current operating conditions of the battery module, photovoltaic charging module, and inverter module.

[0072] Specifically, after the controller obtains the current operating conditions of the battery module, photovoltaic charging module, and inverter module, it can determine the current charging condition type of the battery module based on these conditions. The current operating condition type includes normal charging condition and abnormal charging condition, and abnormal charging condition includes recoverable abnormal charging condition and unrecoverable abnormal charging condition.

[0073] Specifically, recoverable charging anomalies refer to charging anomalies caused by temporary unmet environmental or operational conditions. When the battery module's current charging condition is a recoverable anomaly, it can automatically revert to normal charging as the environment changes or operating conditions improve, without requiring manual intervention or hardware replacement. For example, recoverable charging anomalies can include temperature anomalies and photovoltaic charging anomalies. Temperature anomalies specifically refer to charging anomalies caused by the battery module's current operating temperature exceeding the normal charging temperature threshold. Photovoltaic charging anomalies specifically refer to charging anomalies caused by excessively low photovoltaic power supply voltage from the photovoltaic charging module, such as charging anomalies in application scenarios like cloudy days or nighttime. The controller can determine whether the battery module's current charging condition is a temperature anomaly based on its current operating temperature and remaining charge, and can also determine whether it is a photovoltaic charging anomaly based on its remaining charge and current charging / discharging current.

[0074] An unrecoverable charging anomaly can be understood as a charging anomaly caused by hardware damage or malfunction within the energy storage system. Manual repair or hardware replacement is required to restore the battery module's current charging condition to normal. For example, the controller can determine whether there are operational faults in the battery module, photovoltaic charging module, and inverter module based on their current operating conditions, thus determining whether the battery module's current charging condition is an unrecoverable charging anomaly. Determining the battery module's current charging condition lays the foundation for subsequently dynamically adjusting the battery management module's control strategy for the battery module's charging and discharging state.

[0075] S103. When the current charging condition of the battery module is a recoverable abnormal charging condition, the battery management module controls the battery module to stop charging and discharging. When the current charging condition of the battery module is detected to be restored to the normal charging condition, the battery management module controls the battery module to start charging and discharging.

[0076] Specifically, when the controller determines that the current charging condition of the battery module is a recoverable abnormal charging condition, that is, when the controller determines that the current charging condition of the battery module is an abnormal temperature condition or an abnormal photovoltaic charging condition, the controller will control the charging power transistor and the discharging power transistor to disconnect through the battery management module. This will enable the controller to control the battery module to stop charging and discharging, thereby preventing the battery module from continuously discharging with a small current, avoiding over-discharge faults of the battery module, extending the service life of the battery module, and improving the safety and control flexibility of the energy storage system.

[0077] Furthermore, after the controller stops charging and discharging the battery module through the battery management module, it will continuously monitor in real time whether the current charging condition of the battery module has returned to normal charging conditions. For example, when the controller detects that the ambient temperature of the battery module's environment is within the normal charging temperature threshold range, or when the controller detects an increase in the photovoltaic power supply voltage of the photovoltaic charging module, it can determine that the current charging condition of the battery module has returned to normal charging conditions. The controller will then control the charging power transistor and the discharging power transistor to conduct through the battery management module, enabling the battery module to re-enter normal charging and discharging states. By promptly restoring the battery module's operating state after the current charging condition returns to normal charging conditions, the adaptability of the energy storage system in complex environments is enhanced, the downtime of the energy storage system is reduced, and the energy utilization efficiency of the energy storage system is improved.

[0078] In this embodiment, by acquiring the real-time operating conditions of the battery module, photovoltaic charging module, and inverter module, the current charging condition type of the battery module can be determined based on its current operating temperature, remaining charge, and current charging / discharging current; the current photovoltaic supply voltage of the photovoltaic charging module; and the current AC supply voltage of the inverter module. When the current charging condition type of the battery module is a recoverable charging anomaly, the battery management module controls the battery module to stop charging and discharging. This prevents the battery module from continuously discharging with a small current, avoiding over-discharge faults, extending the battery module's lifespan, and improving the safety and control flexibility of the energy storage system. Furthermore, by controlling the battery module to start charging and discharging when the current charging condition type of the battery module is detected to have returned to a normal charging condition, the battery management module enhances the adaptive capability of the energy storage system in complex environments, reduces downtime, and improves the energy utilization efficiency of the energy storage system.

[0079] Example 3

[0080] Figure 3 This is a flowchart illustrating a charging and discharging control method for an energy storage system according to Embodiment 3 of the present invention. Based on the above embodiments, this embodiment provides a detailed description of the charging and discharging control method for the energy storage system when the current charging condition of the battery module is an abnormal temperature condition. Accordingly, as shown... Figure 3 As shown, the charging and discharging control method of the energy storage system in this embodiment may include:

[0081] S201: Real-time acquisition of the operating status of battery modules, photovoltaic charging modules, and inverter modules.

[0082] The operating conditions of the battery module include operating temperature, remaining power, and charging / discharging current; the operating conditions of the photovoltaic charging module include photovoltaic power supply voltage; and the operating conditions of the inverter module include AC power supply voltage.

[0083] S202. When the current operating conditions of the battery module, photovoltaic charging module, and inverter module meet the first preset condition, the current charging condition type of the battery module is determined to be an abnormal temperature condition.

[0084] The first preset condition includes at least one of the current photovoltaic charging voltage of the photovoltaic charging module and the current AC power supply voltage of the inverter module being greater than zero, the current operating temperature of the battery module exceeding the normal charging temperature threshold range, and the current remaining power of the battery module being zero.

[0085] Specifically, when the controller determines that the current operating conditions of the battery module, photovoltaic charging module, and inverter module meet the first preset condition, the current charging condition of the battery module will be classified as an abnormal temperature condition. This means that if at least one of the current photovoltaic charging voltage of the photovoltaic charging module and the current AC supply voltage of the inverter module is greater than zero, it indicates that the energy storage system is currently connected to a valid power source, meaning the energy storage system has a photovoltaic power supply terminal or a mains power terminal connected, and the battery module has the prerequisite for charging startup. When the current operating temperature of the battery module exceeds the normal charging temperature threshold range, it indicates that the current ambient temperature of the environment in which the battery module is located is not suitable for charging the battery module. When the current remaining charge of the battery module is zero, it indicates that the battery module is completely discharged. If the battery module continues to discharge with a small current at this time, it will lead to deep discharge or even failure.

[0086] Therefore, when the controller determines that the current operating conditions of the battery module, photovoltaic charging module, and inverter module meet the first preset condition, it indicates that the current charging condition of the battery module is an abnormal temperature condition. The battery management module needs to control the battery module to stop charging and discharging, thereby preventing the battery module from continuously discharging with a small current, avoiding over-discharge faults of the battery module, extending the service life of the battery module, and improving the safety and control flexibility of the energy storage system.

[0087] S203. When the current charging condition of the battery module is an abnormal temperature condition, the battery management module controls the battery module to stop charging and discharging.

[0088] S204. Real-time acquisition of the ambient temperature of the environment where the battery module is located.

[0089] Specifically, after the controller stops charging and discharging the battery module through the battery management module, in order to continuously detect whether the current charging condition of the battery module has returned to the normal charging condition, the controller can obtain the ambient temperature of the environment where the battery module is located in real time through the temperature sensor, which provides data support for subsequent judgment on whether the current charging condition of the battery module has returned to the normal charging condition.

[0090] S205. When the current ambient temperature of the environment where the battery module is located is within the normal charging temperature threshold range, determine that the current charging condition of the battery module is restored to the normal charging condition.

[0091] Specifically, when the controller determines that the current ambient temperature of the battery module's environment is within the normal charging temperature threshold range, it can be determined that the current ambient temperature is suitable for charging the battery module. Therefore, the controller will restore the current charging condition of the battery module to the normal charging condition. The controller will control the conduction of the charging power transistor and the discharging power transistor through the battery management module to control the battery module to re-enter the normal charging and discharging state, thereby reducing the downtime of the energy storage system and improving the energy utilization efficiency of the energy storage system.

[0092] S206. When the current charging condition of the battery module is detected to return to the normal charging condition, the battery management module controls the battery module to start charging and discharging.

[0093] S207: Real-time acquisition of the operating temperature of the battery module.

[0094] Specifically, after the controller starts charging and discharging the battery module through the battery management module, it will again obtain the operating temperature of the battery module in real time through the battery management module to further verify whether the current charging condition of the battery module is under normal charging conditions.

[0095] S208. When the current operating temperature of the battery module exceeds the normal charging temperature threshold range, the battery management module controls the battery module to stop charging and discharging.

[0096] Specifically, if the controller, after initiating charging and discharging of the battery module through the battery management module, detects that the current operating temperature of the battery module still exceeds the normal charging temperature threshold, the controller will control the battery module to stop charging and discharging, thereby cutting off the energy interaction between the battery module and the external circuit. This avoids the risk of thermal runaway and over-discharge caused by blindly resuming the charging and discharging state of the battery module when the current ambient temperature of the battery module is within the normal charging temperature threshold, but the current operating temperature of the battery module still exceeds the normal charging temperature threshold due to self-heating, local anomalies, or thermal hysteresis. This further improves the stability and safety of the energy storage system.

[0097] In this embodiment, by determining that the current charging condition of the battery module is an abnormal temperature condition when at least one of the current photovoltaic charging voltage of the photovoltaic charging module and the current AC supply voltage of the inverter module is greater than zero, the current operating temperature of the battery module exceeds the normal charging temperature threshold range, and the current remaining charge of the battery module is zero, the battery module's current charging condition is determined to be an abnormal temperature condition. This allows the battery management module to promptly control the battery module to stop charging and discharging, avoiding over-discharge faults, extending the battery module's lifespan, and improving the safety and control flexibility of the energy storage system. After the battery module stops charging and discharging through the battery management module, the ambient temperature of the environment where the battery module is located is acquired in real time. This allows the battery module's current charging condition to be restored to a normal charging condition when the current ambient temperature is within the normal charging temperature threshold range. This enables the battery module to promptly re-enter a normal charging and discharging state, reducing the downtime of the energy storage system and improving its energy utilization efficiency. Furthermore, by acquiring the operating temperature of the battery module in real time after controlling the battery module to start charging and discharging through the battery management module, the battery module can stop charging and discharging when the current operating temperature of the battery module exceeds the normal charging temperature threshold range, thereby further improving the stability and safety of the energy storage system.

[0098] Example 4

[0099] Figure 4 This is a flowchart illustrating a charging and discharging control method for an energy storage system according to Embodiment 4 of the present invention. Based on the above embodiments, this embodiment provides a detailed description of the charging and discharging control method for the energy storage system when the current charging condition of the battery module is an abnormal photovoltaic charging condition. Accordingly, as shown... Figure 4 As shown, the charging and discharging control method of the energy storage system in this embodiment may include:

[0100] S301: Real-time acquisition of the operating status of battery modules, photovoltaic charging modules, and inverter modules.

[0101] The operating conditions of the battery module include operating temperature, remaining power, and charging / discharging current; the operating conditions of the photovoltaic charging module include photovoltaic power supply voltage; and the operating conditions of the inverter module include AC power supply voltage.

[0102] S302. When the battery module is in a charging state, determine the current integrated value of the charging current of the battery module based on the charging current of the battery module; when the battery module is in a discharging state, determine the current integrated value of the discharging current of the battery module based on the discharging current of the battery module.

[0103] Specifically, to determine whether the current charging condition of the battery module is an abnormal photovoltaic charging condition, the controller can first calculate the integral value of the current charging current of the battery module based on the charging current when the battery management module determines that the battery module is in a charging state, and then calculate the integral value of the current discharging current of the battery module based on the discharging current when the battery management module determines that the battery module is in a discharging state. It can be understood that the integral value of the charging current reflects the accumulated charging capacity of the battery module, and the integral value of the discharging current reflects the accumulated discharging capacity of the battery module. By obtaining the integral values ​​of the current charging current and the current discharging current, a data foundation is provided for subsequently determining whether the current charging condition of the battery module is an abnormal photovoltaic charging condition.

[0104] S303. When the current remaining power of the battery module, the current photovoltaic charging voltage of the photovoltaic charging module, the current AC power supply voltage of the inverter module, the current charging current integral, and the current discharging current integral meet the second preset condition, the current charging condition of the battery module is determined to be an abnormal photovoltaic charging condition.

[0105] The second preset condition includes the battery module's current remaining power being zero, the photovoltaic charging module's current photovoltaic charging voltage being greater than zero, the inverter module's current AC power supply voltage being zero, and the current charging current integral being zero, and / or the current discharging current integral being greater than the current charging current integral.

[0106] Specifically, when the controller determines that the current remaining battery capacity, the current photovoltaic charging voltage of the photovoltaic charging module, the current AC supply voltage of the inverter module, the integral of the current charging current, and the integral of the current discharging current all meet the second preset condition, the current charging condition of the battery module will be determined as an abnormal photovoltaic charging condition. It can be understood that when the current remaining battery capacity is zero, it indicates that the battery module is completely discharged. If the battery module continues to discharge with a small current at this time, it will lead to deep discharge or even failure. When the current photovoltaic charging voltage of the photovoltaic charging module is greater than zero, and the current AC supply voltage of the inverter module is zero, it indicates that the photovoltaic charging module is connected to the photovoltaic power supply terminal and has the prerequisite for providing photovoltaic power to the battery, while the inverter module is not connected to the mains power terminal. At this time, the battery module can only rely on the photovoltaic charging module for charging. When the integral of the current charging current is zero, it indicates that the current supply voltage of the photovoltaic charging module is insufficient to support the charging of the battery module. Alternatively, when the integral of the current discharging current is greater than the integral of the current charging current, it indicates that the accumulated discharge capacity of the battery module is greater than the accumulated charging capacity, meaning that the battery module is undercharged.

[0107] Therefore, when the controller determines that the current remaining power of the battery module, the current photovoltaic charging voltage of the photovoltaic charging module, the current AC power supply voltage of the inverter module, the current integrated charging current, and the current integrated discharging current meet the second preset condition, it indicates that the current charging condition of the battery module is an abnormal photovoltaic charging condition. The battery management module needs to control the battery module to stop charging and discharging, thereby preventing the battery module from continuously discharging with a small current, avoiding over-discharge faults of the battery module, extending the service life of the battery module, and improving the safety and control flexibility of the energy storage system.

[0108] S304. When the current charging condition of the battery module is an abnormal photovoltaic charging condition, the battery management module controls the battery module to stop charging and discharging.

[0109] S305. When the battery module stops charging and discharging under the control of the battery management module, the current photovoltaic power supply voltage of the photovoltaic charging module is determined as the first photovoltaic power supply voltage.

[0110] Specifically, in order to continuously monitor whether the current charging condition of the battery module has returned to normal charging conditions, the controller can determine the current photovoltaic supply voltage of the photovoltaic charging module as the first photovoltaic supply voltage when the battery module stops charging and discharging through the battery management module. The first photovoltaic supply voltage reflects the basic power supply capacity of the photovoltaic charging module, so that it can be used as a reference to determine whether the photovoltaic charging module has returned to normal power supply capacity.

[0111] S306. Real-time acquisition of the photovoltaic power supply voltage of the photovoltaic charging module and the AC power supply voltage of the inverter module.

[0112] Specifically, after the battery module stops charging and discharging through the battery management module, the controller can also obtain the photovoltaic power supply voltage of the photovoltaic charging module and the AC power supply voltage of the inverter module in real time, thus providing a data basis for determining whether the current charging condition of the battery module has been restored to the normal charging condition.

[0113] S307. When the current photovoltaic power supply voltage of the photovoltaic charging module and the current AC power supply voltage of the inverter module meet the third preset condition, determine that the current charging condition of the battery module is restored to the normal charging condition.

[0114] The third preset condition includes the voltage difference between the current photovoltaic power supply voltage and the first photovoltaic power supply voltage being greater than a preset voltage difference threshold, and / or the current AC power supply voltage being greater than zero.

[0115] Specifically, when the controller determines that the current photovoltaic supply voltage of the photovoltaic charging module and the current AC supply voltage of the inverter module meet the third preset condition, the current charging condition of the battery module will be restored to the normal charging condition. It can be understood that when the voltage difference between the current photovoltaic supply voltage of the photovoltaic charging module and the first photovoltaic supply voltage is greater than a preset voltage difference threshold, it indicates that the power generation capacity of the photovoltaic power supply terminal connected to the photovoltaic charging module is enhanced, and the photovoltaic power supply module has the ability to normally supply power to the energy storage battery. Alternatively, when the current AC supply voltage of the inverter module is greater than zero, it indicates that the inverter module is connected to the mains power supply, and the battery module can also be charged using the AC supply voltage provided by the mains power supply. The preset voltage difference threshold can be set according to actual needs; this invention does not impose specific limitations on it. For example, the preset voltage difference threshold can be 2V.

[0116] Therefore, when the controller determines that the current photovoltaic power supply voltage of the photovoltaic charging module and the current AC power supply voltage of the inverter module meet the third preset condition, it will control the charging power transistor and the discharging power transistor to be turned on through the battery management module, so as to control the battery module to re-enter the normal charging and discharging state, thereby reducing the downtime of the energy storage system and improving the energy utilization efficiency of the energy storage system.

[0117] S308. When the current charging condition of the battery module is detected to return to the normal charging condition, the battery management module controls the battery module to start charging and discharging.

[0118] S309. When the battery module is in a charging state, determine the current integrated value of the charging current of the battery module based on the charging current of the battery module; when the battery module is in a discharging state, determine the current integrated value of the discharging current of the battery module based on the discharging current of the battery module.

[0119] Specifically, after the controller starts charging and discharging the battery module through the battery management module, it will calculate the current integral value of the charging current of the battery module based on the charging current when the battery management module determines that the battery module is in a charging state, and calculate the current integral value of the discharging current of the battery module based on the discharging current when the battery management module determines that the battery module is in a discharging state. This is to further verify whether the current charging condition of the battery module is in a normal charging condition.

[0120] S3010: When the integral of the current discharge current is greater than the integral of the current charging current, the battery management module controls the battery module to stop charging and discharging.

[0121] Specifically, if the controller detects that the integral of the current discharge current of the battery module is greater than the integral of the current charging current after controlling the battery module to start charging and discharging via the battery management module, it indicates that the judgment of the current photovoltaic power supply voltage of the photovoltaic charging module and the current AC power supply voltage of the inverter module in the previous steps is transient, and the battery module still has an abnormal charging condition. Therefore, the controller will control the battery module to stop charging and discharging through the battery management module to cut off the energy interaction between the battery module and the external circuit again, avoiding the risk of thermal runaway and over-discharge caused by blindly restoring the charging and discharging state of the battery module, and further improving the stability and safety of the energy storage system.

[0122] In this embodiment, by determining the current charging condition of the battery module as an abnormal photovoltaic charging condition when the current remaining charge of the battery module is zero, the current photovoltaic charging voltage of the photovoltaic charging module is greater than zero, the current AC supply voltage of the inverter module is zero, and the current integrated charging current is zero, and / or the current integrated discharging current is greater than the current integrated charging current, the battery module's current charging condition is determined to be an abnormal photovoltaic charging condition. This allows for timely control of the battery module to stop charging and discharging, avoiding over-discharge faults, extending the battery module's lifespan, and improving the safety and control flexibility of the energy storage system. By determining the current photovoltaic supply voltage of the photovoltaic charging module as the first photovoltaic supply voltage when the battery management module controls the battery module to stop charging and discharging, and by acquiring the photovoltaic supply voltage of the photovoltaic charging module and the AC supply voltage of the inverter module in real time, the battery module can be promptly controlled to re-enter normal charging and discharging when the voltage difference between the current photovoltaic supply voltage and the first photovoltaic supply voltage exceeds a preset voltage difference threshold, and / or the current AC supply voltage is greater than zero. This reduces the downtime of the energy storage system and improves its energy utilization efficiency. Furthermore, by controlling the battery module to start charging and discharging after the battery management module detects that the integral of the current discharge current is greater than the integral of the current charging current, the battery management module controls the battery module to stop charging and discharging, thus avoiding the risk of thermal runaway and over-discharge caused by blindly restoring the charging and discharging state of the battery module, and further improving the stability and safety of the energy storage system.

[0123] Example 5

[0124] Figure 5 This is a flowchart illustrating a charging and discharging control method for an energy storage system according to Embodiment 5 of the present invention. Based on the above embodiments, this embodiment provides a detailed description of the charging and discharging control method for the energy storage system when the current charging condition of the battery module is an unrecoverable charging abnormal condition. Accordingly, as shown... Figure 5 As shown, the charging and discharging control method of the energy storage system in this embodiment may include:

[0125] S401: Real-time acquisition of the operating status of battery modules, photovoltaic charging modules, and inverter modules.

[0126] The operating conditions of the battery module include operating temperature, remaining power, and charging / discharging current; the operating conditions of the photovoltaic charging module include photovoltaic power supply voltage; and the operating conditions of the inverter module include AC power supply voltage.

[0127] S402. When it is determined that at least one of the battery module, photovoltaic charging module, and inverter module has an operational fault based on the current operating conditions of the battery module, photovoltaic charging module, and inverter module, the current charging condition of the battery module is determined to be an unrecoverable charging abnormal condition.

[0128] Specifically, when the controller determines that at least one of the battery module, photovoltaic charging module, and inverter module has an operational fault based on the current operating conditions of the battery module, photovoltaic charging module, and inverter module, such as when the controller determines that the battery module has abnormal temperature or voltage, a short circuit or open circuit fault in the photovoltaic charging module, or an inverter module has zero inverter efficiency or communication interruption, the current charging condition of the battery module will be determined as an unrecoverable abnormal charging condition.

[0129] S403. When the current charging condition of the battery module is an unrecoverable charging abnormal condition, the battery management module controls the battery module to stop charging and discharging.

[0130] Specifically, when the controller determines that the current charging condition of the battery module is an unrecoverable charging abnormal condition, it will control the battery module to stop charging and discharging through the battery management module. This will prevent the battery module from continuously discharging with a small current, avoid over-discharge faults of the battery module, extend the service life of the battery module, and ensure that the battery module has more remaining power to wait for the fault in the energy storage system to be eliminated, thereby improving the safety and control flexibility of the energy storage system.

[0131] It is understandable that an unrecoverable charging abnormal condition can be specifically understood as a charging abnormal condition caused by damage or failure of internal hardware in the energy storage system. Manual repair and hardware replacement are required to restore the current charging condition of the battery module to the normal charging condition. Therefore, there is no need to detect in real time whether the current charging condition of the battery module has been restored to the normal charging condition, thus avoiding the waste of computing resources of the energy storage system.

[0132] Optionally, the charging and discharging control method of the energy storage system further includes: when the current charging condition of the battery module is an unrecoverable charging abnormal condition, determining whether the current photovoltaic power supply voltage of the photovoltaic charging module and the current AC power supply voltage of the inverter module meet a fourth preset condition; the fourth preset condition includes that at least one of the current photovoltaic power supply voltage and the current AC power supply voltage is greater than zero; if yes, the battery management module controls the battery module to stop charging and discharging, and controls the alarm module to display fault information; if no, the alarm module is controlled to continuously display fault information until a preset time, and then the battery management module controls the battery module to stop charging and discharging.

[0133] Specifically, when the controller determines that the current charging condition of the battery module is an unrecoverable charging abnormal condition, it will continue to determine whether the current photovoltaic power supply voltage of the photovoltaic charging module and the current AC power supply voltage of the inverter module meet the fourth preset condition, so as to dynamically adjust the alarm duration of the fault information displayed through the alarm module.

[0134] It is understandable that when at least one of the current photovoltaic power supply voltage and the current AC power supply voltage is greater than zero, it indicates that the energy storage system is receiving charging, and the photovoltaic power supply end and / or the mains power end can continuously supply power to the controller and alarm module. Therefore, after the controller controls the battery module to stop charging and discharging through the battery management module, it can control the alarm module to continuously display fault information, such as keeping the display screen constantly lit to show the fault code, or controlling the wireless communication module to continuously send alarm notifications to the remote terminal until manual intervention is required. It is also understandable that when both the current photovoltaic power supply voltage and the current AC power supply voltage are zero, it indicates that the energy storage system is not receiving charging, and the controller and alarm module can only rely on the remaining power of the battery module for power. Therefore, the controller will first control the alarm module to continuously display fault information for a preset time, and then control the battery module to stop charging and discharging through the battery management module. The preset time can be, for example, 1 minute, to ensure that operators have sufficient time to detect faults in the energy storage system while avoiding over-discharge faults caused by the battery module continuously supplying power to the alarm module, thereby improving the safety, maintainability, and stability of the energy storage system in fault conditions.

[0135] In this embodiment, by determining that at least one of the battery module, photovoltaic charging module, and inverter module is experiencing an operational fault based on their current operating conditions, the current charging condition of the battery module is identified as an unrecoverable charging anomaly. This allows the battery management module to promptly stop charging and discharging the battery module, preventing over-discharge faults, extending the battery module's lifespan, and ensuring that the battery module retains more charge to await fault resolution in the energy storage system, thus improving the system's safety and control flexibility. Furthermore, by controlling the battery management module to stop charging and discharging when at least one of the current photovoltaic supply voltage and current AC supply voltage is greater than zero, and controlling the alarm module to display fault information, and by controlling the alarm module to continuously display fault information for a preset time when both the current photovoltaic supply voltage and current AC supply voltage are zero, before controlling the battery management module to stop charging and discharging, the safety, maintainability, and stability of the energy storage system under fault conditions are improved.

[0136] Example 6

[0137] Figure 6 This is a schematic diagram of the structure of a charge / discharge control device for an energy storage system provided in Embodiment Six of the present invention. This device can implement the charge / discharge control method for the energy storage system provided in this embodiment of the invention. The device can be implemented in software and / or hardware, and is generally integrated into the controller of the energy storage system. Figure 6 As shown, the device includes: an operating condition acquisition module 501, a charging condition type determination module 502, and a battery module control module 503. The specific structure of the device is as follows:

[0138] The operating condition acquisition module 501 is used to acquire the operating conditions of the battery module, photovoltaic charging module, and inverter module in real time. The operating conditions of the battery module include operating temperature, remaining power, and charging and discharging current. The operating conditions of the photovoltaic charging module include photovoltaic power supply voltage, and the operating conditions of the inverter module include AC power supply voltage.

[0139] The charging condition type determination module 502 is used to determine the current charging condition type of the battery module based on the current operating conditions of the battery module, the photovoltaic charging module, and the inverter module.

[0140] The battery module control module 503 is used to control the battery module to stop charging and discharging when the current charging condition of the battery module is a recoverable charging abnormal condition, and to control the battery module to start charging and discharging when the current charging condition of the battery module is detected to be restored to the normal charging condition.

[0141] In an optional embodiment of the present invention, the charging condition type determination module 502 may further be used to: determine the current charging condition type of the battery module as an abnormal temperature condition when the current operating conditions of the battery module, the photovoltaic charging module, and the inverter module meet the first preset condition; the first preset condition includes at least one of the current photovoltaic charging voltage of the photovoltaic charging module and the current AC power supply voltage of the inverter module being greater than zero, the current operating temperature of the battery module exceeding the normal charging temperature threshold range, and the current remaining power of the battery module being zero.

[0142] In an optional embodiment of the present invention, the battery module control module 503 may also be used to: when the current charging condition of the battery module is an abnormal temperature condition, and when it is detected that the current charging condition of the battery module has recovered to the normal charging condition, obtain the ambient temperature of the environment where the battery module is located in real time before controlling the battery module to start charging and discharging through the battery management module; and determine that the current charging condition of the battery module has recovered to the normal charging condition when the current ambient temperature of the environment where the battery module is located is within the normal charging temperature threshold range.

[0143] In an optional embodiment of the present invention, the battery module control module 503 may also be used to: when the current charging condition of the battery module is an abnormal temperature condition, and the current charging condition of the battery module is detected to be restored to a normal charging condition, the battery module starts charging and discharging through the battery management module, and then obtains the operating temperature of the battery module in real time; when the current operating temperature of the battery module exceeds the normal charging temperature threshold range, the battery module stops charging and discharging through the battery management module.

[0144] In an optional embodiment of the present invention, the charging condition type determination module 502 may further be used to: determine the current charging current integral value of the battery module based on the charging current of the battery module when the battery module is in a charging state; determine the current discharging current integral value of the battery module based on the discharging current of the battery module when the battery module is in a discharging state; and determine the current charging condition type of the battery module as a photovoltaic charging abnormal condition when the current remaining power of the battery module, the current photovoltaic charging voltage of the photovoltaic charging module, the current AC supply voltage of the inverter module, the current charging current integral, and the current discharging current integral satisfy a second preset condition; the second preset condition includes the current remaining power of the battery module being zero, the current photovoltaic charging voltage of the photovoltaic charging module being greater than zero, the current AC supply voltage of the inverter module being zero, and the current charging current integral being zero, and / or the current discharging current integral being greater than the current charging current integral.

[0145] In an optional embodiment of the present invention, the battery module control module 503 may further be used to: when the current charging condition of the battery module is an abnormal photovoltaic charging condition, before controlling the battery module to start charging and discharging through the battery management module when the current charging condition of the battery module is detected to have recovered to the normal charging condition, further include: when controlling the battery module to stop charging and discharging through the battery management module, determining the current photovoltaic power supply voltage of the photovoltaic charging module as the first photovoltaic power supply voltage; acquiring the photovoltaic power supply voltage of the photovoltaic charging module and the AC power supply voltage of the inverter module in real time; when the current photovoltaic power supply voltage of the photovoltaic charging module and the current AC power supply voltage of the inverter module meet a third preset condition, determining that the current charging condition of the battery module has recovered to the normal charging condition; the third preset condition includes the voltage difference between the current photovoltaic power supply voltage and the first photovoltaic power supply voltage being greater than a preset voltage difference threshold, and / or the current AC power supply voltage being greater than zero.

[0146] In an optional embodiment of the present invention, the battery module control module 503 may further be used to: when the current charging condition of the battery module is an abnormal photovoltaic charging condition, and upon detecting that the current charging condition of the battery module has recovered to a normal charging condition, control the battery module to start charging and discharging through the battery management module; when the battery module is in a charging state, determine the integral value of the current charging current of the battery module based on the charging current of the battery module; when the battery module is in a discharging state, determine the integral value of the current discharging current of the battery module based on the discharging current of the battery module; and when the integral value of the current discharging current is greater than the integral value of the current charging current, control the battery module to stop charging and discharging through the battery management module.

[0147] In an optional embodiment of the present invention, the battery module control module 503 may also be used to: control the battery module to stop charging and discharging when the current charging condition of the battery module is an unrecoverable charging abnormal condition.

[0148] In an optional embodiment of the present invention, the charging condition type determination module 502 may also be used to: determine that the current charging condition type of the battery module is an unrecoverable charging abnormal condition when it is determined that at least one of the battery module, photovoltaic charging module, and inverter module has an operational fault based on the current operating conditions of the battery module, photovoltaic charging module, and inverter module.

[0149] In an optional embodiment of the present invention, the battery module control module 503 may further be used to: when the current charging condition of the battery module is an unrecoverable charging abnormal condition, determine whether the current photovoltaic power supply voltage of the photovoltaic charging module and the current AC power supply voltage of the inverter module meet a fourth preset condition; the fourth preset condition includes that at least one of the current photovoltaic power supply voltage and the current AC power supply voltage is greater than zero; if yes, then control the battery module to stop charging and discharging through the battery management module, and control the alarm module to display fault information; if no, then control the alarm module to continuously display fault information until a preset time, and then control the battery module to stop charging and discharging through the battery management module.

[0150] The charging and discharging control device of the above-described energy storage system can execute the charging and discharging control method of the energy storage system provided in any embodiment of the present invention, and has the corresponding functional modules and beneficial effects of the method. Technical details not described in detail in this embodiment can be found in the charging and discharging control method based on the energy storage system provided in any embodiment of the present invention.

[0151] Since the charging and discharging control device of the energy storage system described above is a device capable of executing the charging and discharging control method of the energy storage system in the embodiments of the present invention, those skilled in the art can understand the specific implementation and various variations of the charging and discharging control device of the energy storage system in this embodiment based on the charging and discharging control method of the energy storage system described in the embodiments of the present invention. Therefore, how the charging and discharging control device of the energy storage system implements the charging and discharging control method of the energy storage system in the embodiments of the present invention will not be described in detail here. Any device used by those skilled in the art to implement the charging and discharging control method of the energy storage system in the embodiments of the present invention falls within the scope of protection of this application.

[0152] It should be understood that the various forms of processes shown above can be used to reorder, add, or delete steps. For example, the steps described in this invention can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution disclosed in this invention can be achieved, and this is not limited herein.

[0153] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A charging and discharging control method for an energy storage system, characterized in that, The energy storage system includes a battery module, a photovoltaic charging module, and an inverter module. The battery module is equipped with a battery management module for controlling the charging and discharging state of the battery module. The battery module is electrically connected to both the photovoltaic charging module and the inverter module. The charging and discharging control method of the energy storage system includes: The operating conditions of the battery module, the photovoltaic charging module, and the inverter module are acquired in real time. The operating conditions of the battery module include operating temperature, remaining power, and charging / discharging current. The operating conditions of the photovoltaic charging module include photovoltaic power supply voltage. The operating conditions of the inverter module include AC power supply voltage. Based on the current operating conditions of the battery module, the photovoltaic charging module, and the inverter module, determine the current charging condition type of the battery module; When the current charging condition of the battery module is a recoverable abnormal charging condition, the battery management module controls the battery module to stop charging and discharging. When the current charging condition of the battery module is detected to have recovered to a normal charging condition, the battery management module controls the battery module to start charging and discharging.

2. The charging and discharging control method for an energy storage system according to claim 1, characterized in that, The recoverable charging abnormal conditions include abnormal temperature conditions; Based on the current operating conditions of the battery module, the photovoltaic charging module, and the inverter module, the current charging condition type of the battery module is determined, including: When the current operating conditions of the battery module, the photovoltaic charging module, and the inverter module meet the first preset conditions, the current charging condition type of the battery module is determined to be the abnormal temperature condition; the first preset conditions include at least one of the current photovoltaic charging voltage of the photovoltaic charging module and the current AC power supply voltage of the inverter module being greater than zero, the current operating temperature of the battery module exceeding the normal charging temperature threshold range, and the current remaining power of the battery module being zero.

3. The charging and discharging control method for an energy storage system according to claim 2, characterized in that, The current charging condition of the battery module is under the abnormal temperature condition. Before the battery module starts charging and discharging through the battery management module when the current charging condition of the battery module is detected to have returned to the normal charging condition, the following steps are also included: The ambient temperature of the environment in which the battery module is located is obtained in real time; When the current ambient temperature of the environment where the battery module is located is within the normal charging temperature threshold range, the current charging condition of the battery module is determined to be restored to the normal charging condition.

4. The charging and discharging control method for the energy storage system according to claim 3, characterized in that, The current charging condition of the battery module is under the abnormal temperature condition. After detecting that the current charging condition of the battery module has returned to the normal charging condition, and controlling the battery module to start charging and discharging via the battery management module, the following steps are also included: The operating temperature of the battery module is acquired in real time. When the current operating temperature of the battery module exceeds the normal charging temperature threshold range, the battery management module controls the battery module to stop charging and discharging.

5. The charging and discharging control method for an energy storage system according to claim 1, characterized in that, The recoverable charging abnormal conditions include photovoltaic charging abnormal conditions; Determining the current charging condition type of the battery module based on the current operating conditions of the battery module, the photovoltaic charging module, and the inverter module further includes: When the battery module is in a charging state, the current integrated value of the charging current of the battery module is determined based on the charging current of the battery module. When the battery module is in a discharging state, the current integral value of the battery module's discharge current is determined based on the battery module's discharge current. When the current remaining power of the battery module, the current photovoltaic charging voltage of the photovoltaic charging module, the current AC supply voltage of the inverter module, the current charging current integral, and the current discharging current integral satisfy a second preset condition, the current charging condition of the battery module is determined to be the abnormal photovoltaic charging condition. The second preset condition includes the current remaining power of the battery module being zero, the current photovoltaic charging voltage of the photovoltaic charging module being greater than zero, the current AC supply voltage of the inverter module being zero, and the current charging current integral being zero, and / or the current discharging current integral being greater than the current charging current integral.

6. The charging and discharging control method for an energy storage system according to claim 5, characterized in that, The current charging condition of the battery module is under the abnormal photovoltaic charging condition. Before the battery module starts charging and discharging through the battery management module after detecting that the current charging condition of the battery module has recovered to the normal charging condition, the following steps are also included: When the battery module stops charging and discharging under the control of the battery management module, the current photovoltaic power supply voltage of the photovoltaic charging module is determined as the first photovoltaic power supply voltage; The photovoltaic power supply voltage of the photovoltaic charging module and the AC power supply voltage of the inverter module are acquired in real time. When the current photovoltaic power supply voltage of the photovoltaic charging module and the current AC power supply voltage of the inverter module meet the third preset condition, the current charging condition of the battery module is determined to be restored to the normal charging condition; the third preset condition includes the voltage difference between the current photovoltaic power supply voltage and the first photovoltaic power supply voltage being greater than a preset voltage difference threshold, and / or the current AC power supply voltage being greater than zero.

7. The charging and discharging control method for an energy storage system according to claim 6, characterized in that, The current charging condition of the battery module is under the abnormal photovoltaic charging condition. After detecting that the current charging condition of the battery module has returned to the normal charging condition, and controlling the battery module to start charging and discharging via the battery management module, the following steps are also included: When the battery module is in a charging state, the current integrated value of the charging current of the battery module is determined based on the charging current of the battery module. When the battery module is in a discharging state, the current integral value of the battery module's discharge current is determined based on the battery module's discharge current. When the integral of the current discharge current is greater than the integral of the current charging current, the battery management module controls the battery module to stop charging and discharging.

8. The charging and discharging control method for an energy storage system according to claim 1, characterized in that, Also includes: When the current charging condition of the battery module is an unrecoverable charging abnormal condition, the battery management module controls the battery module to stop charging and discharging.

9. The charging and discharging control method for an energy storage system according to claim 8, characterized in that, Determining the current charging condition type of the battery module based on the current operating conditions of the battery module, the photovoltaic charging module, and the inverter module further includes: When it is determined that at least one of the battery module, the photovoltaic charging module, and the inverter module has an operational fault based on the current operating conditions of the battery module, the photovoltaic charging module, and the inverter module, the current charging condition type of the battery module is determined to be the unrecoverable charging abnormal condition.

10. The charging and discharging control method for an energy storage system according to claim 8, characterized in that, The energy storage system further includes an alarm module; the charging and discharging control method of the energy storage system further includes: When the current charging condition of the battery module is the unrecoverable charging abnormal condition, it is determined whether the current photovoltaic power supply voltage of the photovoltaic charging module and the current AC power supply voltage of the inverter module meet the fourth preset condition; the fourth preset condition includes that at least one of the current photovoltaic power supply voltage and the current AC power supply voltage is greater than zero. If so, the battery management module controls the battery module to stop charging and discharging, and controls the alarm module to display fault information; If not, the alarm module will continue to display fault information for a preset time, and then the battery management module will control the battery module to stop charging and discharging.

11. A charging and discharging control device for an energy storage system, characterized in that, The energy storage system includes a battery module, a photovoltaic charging module, and an inverter module. The battery module is equipped with a battery management module for controlling the charging and discharging state of the battery module. The battery module is electrically connected to both the photovoltaic charging module and the inverter module. The charging and discharging control device of the energy storage system includes: The operating condition acquisition module is used to acquire the operating conditions of the battery module, the photovoltaic charging module, and the inverter module in real time. The operating conditions of the battery module include operating temperature, remaining power, and charging / discharging current. The operating conditions of the photovoltaic charging module include photovoltaic power supply voltage. The operating conditions of the inverter module include AC power supply voltage. The charging condition type determination module is used to determine the current charging condition type of the battery module based on the current operating conditions of the battery module, the photovoltaic charging module, and the inverter module. The battery module control module is used to control the battery module to stop charging and discharging when the current charging condition of the battery module is a recoverable charging abnormal condition, and to control the battery module to start charging and discharging when the current charging condition of the battery module is detected to be restored to the normal charging condition.

12. An energy storage system, characterized in that, include: Battery modules, photovoltaic charging modules, inverter modules, and controllers; The battery module is equipped with a battery management module for controlling the charging and discharging state of the battery module. The battery module is electrically connected to the photovoltaic charging module and the inverter module respectively. The controller is connected to the battery module, the photovoltaic charging module, and the inverter module respectively, and is used to execute the charging and discharging control method of the energy storage system as described in any one of claims 1-10.

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