Energy storage battery detection method and device, electronic equipment and storage medium

Abstract

The application discloses a kind of energy storage battery detection method, device, electronic equipment and storage medium.The method comprises: to battery management system BMS is carried out voltage output battery management system BMS is restarted and powered on;After battery management system BMS is restarted and powered on, whether battery module in energy storage battery is in reference power shortage state in current detection stage is detected, reference power shortage state is that the state that the power of battery module is consumed below preset battery power critical value after battery module is excessively discharged;If battery module in energy storage battery is in reference power shortage state in current detection stage, the battery performance of battery module in energy storage battery is detected to obtain target detection result, and target detection result is used to indicate whether battery module has appeared damage and battery damage positioning result when battery module has appeared damage.The application solves the problem that energy storage battery cannot be explored whether battery is damaged due to power shortage after power shortage.

Description

Technical Field

[0001] This invention relates to the field of new energy technology, and in particular to a method, apparatus, electronic device, and storage medium for testing energy storage batteries. Background Technology

[0002] Currently, energy storage systems typically consist of a power storage inverter (PCS), a battery system, photovoltaic panels, and loads. The battery itself includes cell modules, a battery management system (BMS), and protection circuits. The BMS is generally directly powered by the battery. When the battery is in a low-charge state and has not been charged for an extended period, its voltage gradually decreases until it falls below the BMS's minimum startup voltage, causing the BMS to completely shut down and preventing the PCS from charging the battery. Simultaneously, when the battery system is in a state of prolonged undercharge, the physical state of the electrolyte changes, leading to a series of battery performance and safety issues. In particular, it is difficult to accurately assess the battery's condition and performance for safe recharging, which can easily create safety hazards. Summary of the Invention

[0003] This invention provides a method, apparatus, electronic device, and storage medium for detecting energy storage batteries, in order to solve the problem that after an energy storage battery has been depleted for a long time, it is impossible to detect whether the battery is damaged due to depletion, and that charging it hastily may bring safety risks.

[0004] According to one aspect of the present invention, a method for testing an energy storage battery is provided, the energy storage battery including a battery module and a battery management system (BMS), the method comprising:

[0005] Output voltage to the Battery Management System (BMS) to power on and restart the BMS;

[0006] After the battery management system (BMS) restarts, it checks whether the battery module in the energy storage battery is in a reference depleted state during the current detection phase. The reference depleted state is the state in which the battery module's charge is consumed to a level below a preset battery charge threshold after excessive discharge.

[0007] If the battery module in the energy storage battery is in a reference depleted state during the current detection stage, the battery performance of the battery module in the energy storage battery is detected to obtain the target detection result. The target detection result is used to indicate whether the battery module has been damaged and the battery damage location result when the battery module has been damaged.

[0008] According to another aspect of the present invention, a battery storage testing device is provided, wherein the battery storage includes a battery module and a battery management system (BMS), the device comprising:

[0009] The power-on startup module is used to output voltage to the battery management system (BMS) to restart the BMS.

[0010] The low-power detection module is used to detect whether the battery module in the energy storage battery is in a reference low-power state during the current detection stage after the battery management system (BMS) is restarted. The reference low-power state is the state in which the battery module's power is consumed to a level lower than a preset battery power threshold after excessive discharge.

[0011] The performance detection module is used to detect the battery performance of the battery module in the energy storage battery if the battery module in the energy storage battery is in a reference depleted state during the current detection stage, and obtain the target detection result. The target detection result is used to indicate whether the battery module has been damaged and the battery damage location result when the battery module has been damaged.

[0012] According to another aspect of the present invention, an electronic device is provided, the electronic device comprising:

[0013] At least one processor; and

[0014] A memory communicatively connected to the at least one processor; wherein,

[0015] The memory stores a computer program that can be executed by the at least one processor, which enables the at least one processor to perform the energy storage battery detection method according to any embodiment of the present invention.

[0016] According to another aspect of the present invention, a computer-readable storage medium is provided, the computer-readable storage medium storing computer instructions for causing a processor to execute and implement the energy storage battery detection method according to any embodiment of the present invention.

[0017] The technical solution of this invention addresses the issue of a Battery Management System (BMS) failing to function properly due to unexpected power outages or malfunctions. By supplying voltage to the BMS via an energy storage inverter, the BMS is powered on and restarted. This increases the system's flexibility and operability, allowing for rapid and effective restart when a dedicated external power source is unavailable or traditional restart methods are not feasible, thus restoring battery management and monitoring functions. After the BMS restarts, it detects whether the battery modules in the energy storage battery are in a reference depleted state, quickly determining whether the battery modules have over-discharged to a dangerous state below a preset battery capacity threshold, thus providing a basis for subsequent battery performance testing. It can detect and provide clear preconditions; for battery modules in a reference depleted state, it can accurately indicate whether the battery module has been damaged, which helps to take timely repair or replacement measures and avoid affecting the normal operation of the entire energy storage system due to battery damage. Moreover, when the battery module is damaged, it can provide the battery damage location result, which can quickly and accurately find the damaged part, improve repair efficiency, and reduce repair costs. It solves the problem that after the energy storage battery has been depleted for a long time, it is impossible to know whether the battery is damaged due to depletion, and the safety risks will be brought about by charging rashly. It realizes the ability to judge the condition and performance of the battery without disassembly or external means.

[0018] 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

[0019] 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.

[0020] Figure 1 This is a flowchart of a method for testing an energy storage battery according to an embodiment of the present invention;

[0021] Figure 2 This is an architectural diagram of an energy storage battery system applicable to embodiments of the present invention;

[0022] Figure 3 This is a schematic diagram of the process for testing energy storage batteries in an energy storage battery system applicable to the present invention.

[0023] Figure 4 This is a flowchart of another energy storage battery testing method provided according to an embodiment of the present invention;

[0024] Figure 5This is a schematic diagram of the structure of an energy storage battery testing device according to an embodiment of the present invention;

[0025] Figure 6 This is a schematic diagram of the structure of an electronic device that implements the energy storage battery detection method of the present invention. Detailed Implementation

[0026] Embodiments of the present invention will now be described in more detail with reference to the accompanying drawings. While some embodiments of the invention are shown in the drawings, it should be understood that the invention can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the invention. It should be understood that the accompanying drawings and embodiments are for illustrative purposes only and are not intended to limit the scope of protection of the invention.

[0027] It should be understood that the various steps described in the method embodiments of the present invention may be performed in different orders and / or in parallel. Furthermore, the method embodiments may include additional steps and / or omit the steps shown. The scope of the present invention is not limited in this respect.

[0028] The term "comprising" and its variations as used herein are open-ended inclusion, meaning "including but not limited to". The term "based on" means "at least partially based on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments". Definitions of other terms will be given in the description below.

[0029] It should be noted that the concepts of "first" and "second" mentioned in this invention are only used to distinguish different devices, modules or units, and are not used to limit the order of functions performed by these devices, modules or units or their interdependencies.

[0030] It should be noted that the terms "a" and "a plurality of" used in this invention are illustrative rather than restrictive. Those skilled in the art should understand that, unless otherwise expressly indicated in the context, they should be understood as "one or more".

[0031] Figure 1 This is a flowchart illustrating a method for testing an energy storage battery according to an embodiment of the present invention. This embodiment is applicable to situations where it is possible to determine whether a battery is damaged due to depletion without disassembling the device or using external means. The method can be executed by an energy storage battery testing device, which can be implemented in hardware and / or software. The energy storage battery testing device can be configured in any electronic device with network communication capabilities.

[0032] like Figure 1As shown, the energy storage battery testing method provided in this embodiment may include the following process:

[0033] S110. Output voltage to the battery management system (BMS) to restart the BMS. The energy storage battery includes the battery module and the battery management system (BMS).

[0034] See Figure 2 An energy storage system can include energy storage batteries and a power storage inverter (PCS). The energy storage battery includes battery modules and a battery management system (BMS). The BMS is directly powered by the battery. If the battery module is in a low-charge state and has not been charged, its voltage will gradually decrease until it falls below the minimum startup voltage of the BMS, at which point the BMS will completely lose power. Even if the battery is recharged using the PCS after a period of time, the charging / discharging switch cannot be opened because the BMS cannot be powered on, resulting in a disconnected charging / discharging circuit and preventing the PCS from charging the battery module.

[0035] Furthermore, if batteries are left uncharged for extended periods, especially in cases of severe discharge, the free expansion and contraction of the electrolyte within the battery module can lead to bulging and leakage. Irreversible capacity loss may also occur due to a decline in the activity of the internal materials. Therefore, it is clear that directly charging energy storage batteries after prolonged periods of discharge carries certain risks.

[0036] It's clear that the Battery Management System (BMS) plays a crucial role in the safety and performance of battery modules. It monitors various parameters of the battery module, such as voltage, current, and temperature, and manages charge and discharge to ensure the battery module operates within safe limits. However, in actual use, the BMS may malfunction or experience unexpected power outages for various reasons, rendering it unable to function properly. Therefore, the concept of a power storage inverter (PCS) directly powering up and restarting the BMS has been introduced. Considering that the power storage inverter can not only convert the DC power from the storage battery to AC power for external devices but also provide voltage output to other components under certain conditions, it can directly output voltage to the BMS when it malfunctions or experiences a power outage.

[0037] Optionally, the dry contact of the energy storage inverter controls the closing of the backup switch in the energy storage battery, thereby forming a charging and discharging circuit between the energy storage inverter and the battery management system (BMS), so that the output port of the energy storage inverter is connected to the power input port of the BMS, and the circuit is used to power on and start the BMS again.

[0038] As an optional but not limited implementation, powering on and restarting the battery management system (BMS) by outputting voltage includes the following steps A1-A3:

[0039] Step A1: In response to the control command sent from the dry contact of the energy storage inverter to the backup switch in the energy storage battery, the backup switch in the energy storage battery is closed, forming a charging and discharging circuit between the energy storage inverter and the battery management system (BMS).

[0040] See Figure 2 When battery modules are left unused for an extended period, they may become depleted, and in some cases, even damaged. Once the voltage drops to a certain level, the battery module's voltage will gradually decrease. When it falls below the minimum operating voltage of the BMS (Battery Management System), the BMS will shut down due to insufficient power, and the charge / discharge switch will automatically disconnect. In this situation, even the PCS (Power Storage Inverter System) cannot directly charge the battery; however, the battery activation function can be activated using the PCS's corresponding app.

[0041] See Figure 2 Dry contacts in an energy storage inverter are a type of electrical connection. They refer to two electrical circuits that are not physically connected, but transmit signals solely through the closed or open state of a switch. In an energy storage inverter, dry contacts can transmit various status signals, such as operating status, fault status, charging status, and discharging status. These signals can be received by other devices and used for system monitoring and control.

[0042] See Figure 2 The dry contact on an energy storage inverter is an electrical connection point that can be triggered by external signals to perform specific operations. When a specific control command is received, this dry contact sends a signal to the backup switch in the energy storage battery. The backup switch may normally be in the open state; when a signal is received to the backup switch in the energy storage battery, the backup switch in the energy storage battery will adjust to the closed state, thereby establishing a connection between the energy storage inverter and the BMS to form a charging and discharging circuit. This charging and discharging circuit allows electrical energy to be transferred between the energy storage inverter and the BMS.

[0043] Step A2: By forming a charging and discharging circuit between the energy storage inverter and the battery management system (BMS), a reference voltage is received from the energy storage inverter and forcibly output to the battery management system (BMS). The reference voltage is the lower limit voltage that can support the battery management system (BMS) to enter the reference operating state.

[0044] Step A3: Based on the reference voltage output by the energy storage inverter to the battery management system (BMS), power on and restart the BMS.

[0045] See Figure 2 and Figure 3 The battery management system (BMS) receives a reference voltage forcibly output from the inverter to the BMS through a charging / discharging loop formed between the inverter and the BMS. In other words, once the loop is formed, the inverter can output a specific voltage to the BMS. This reference voltage is the lower limit voltage required for the BMS to enter a reference operating state; it is configurable and represents the minimum voltage required for the BMS to reach this state. The reference operating state can be either the BMS's initialization state or its normal rated operating state. In this state, the BMS can begin performing basic functional checks and preparations on the battery modules.

[0046] See Figure 2 and Figure 3 The reference voltage output from the energy storage inverter to the battery management system (BMS) serves as the startup signal. After inputting the reference voltage to the BMS, it can restart using this voltage, similar to powering on the BMS and restoring it from a shutdown state to an operating state. After restarting, the BMS can begin managing and monitoring the energy storage battery, ensuring its safety and normal operation. The backup switch within the energy storage battery should possess high quality and reliability, accurately closing and opening when needed, and capable of withstanding the current and voltage in the charging and discharging circuit. The reference voltage output from the energy storage inverter should remain stable to ensure the BMS can smoothly enter the reference operating state and restart. Significant fluctuations in the reference voltage may lead to BMS startup failure or malfunctions.

[0047] For example, when the energy storage battery activation function is enabled, the PCS will precisely control the closing of the backup switch inside the energy storage battery through dry contacts. Even if the BMS is not powered on at this time and there is no communication between the BMS and the PCS, the PCS will still force the output of a BMS operating lower limit voltage Vmin from the positive terminal (P+) and the negative terminal (P-). In this case, the BMS will power on and start up again. After starting up, the BMS will first detect the voltage of the battery module.

[0048] S120. After the battery management system (BMS) restarts, it checks whether the battery module in the energy storage battery is in a reference low-charge state during the current detection phase. The reference low-charge state is the state in which the battery module's charge is consumed to a level lower than the preset battery charge threshold after excessive discharge.

[0049] See Figure 2 and Figure 3When the Battery Management System (BMS) restarts after power-on, it needs to perform status checks on the battery modules within the energy storage battery to determine whether they are in a reference depleted state. The reference depleted state refers to the state where the battery module's charge has been depleted below a preset critical charge level after excessive discharge. Excessive discharge can occur due to factors such as prolonged use, failure to recharge in a timely manner, or abnormal discharge. The preset critical charge level is a pre-defined charge value; when the battery module's charge falls below this value, it is considered to be in a depleted state. This critical value is typically determined based on factors such as the battery module's characteristics, usage requirements, and safety considerations.

[0050] Optionally, the method for detecting whether a battery module in an energy storage battery is in a reference depleted state during the current detection phase may vary depending on the BMS and the battery module. The BMS can determine whether the battery module is in a depleted state by monitoring parameters such as voltage, current, and capacity. For example, if the battery module's voltage is lower than a certain value or its capacity is lower than a preset threshold, it can be determined to be in a depleted state.

[0051] By using the above method to detect whether the battery module is in a low-charge state, the current status of the battery can be understood in a timely manner so that appropriate measures can be taken. If the battery module is in a low-charge state, it may affect its performance and lifespan, and may even lead to battery damage or safety issues. Based on the detection results, the next steps can be determined. If the battery module is in a low-charge state, measures such as charging, maintenance, or replacement can be taken to ensure the normal use of the battery and the stable operation of the system.

[0052] As an optional but not limited implementation, detecting whether the battery module in the energy storage battery is in a reference depleted state during the current detection phase includes the following steps B1-B3:

[0053] Step B1: The battery management system (BMS) in the energy storage battery detects the current voltage of the battery modules included in the energy storage battery during the current detection phase. The current voltage is used to indicate the potential difference between the two ends of the battery module used to connect the positive and negative terminals of the energy storage inverter during the current detection phase.

[0054] See Figure 2 and Figure 3During the daily charging and discharging process of the battery, the Battery Management System (BMS) continuously collects key data such as real-time voltage, current, temperature, and module voltage. Furthermore, the BMS meticulously records the specific data and corresponding time for each charge-discharge cycle in a storage module such as Flash memory, which retains data even when power is lost. In this way, the BMS provides accurate and comprehensive historical data for subsequent analysis and diagnostics, enabling a better understanding of battery performance changes and usage patterns.

[0055] See Figure 2 and Figure 3 The battery management system (BMS) within the energy storage battery monitors various state parameters of the battery, including the voltage of the battery module. The current voltage of the battery module during the current monitoring phase refers to the potential difference between the positive and negative terminals of the battery module used to connect to the energy storage inverter. This voltage reflects the battery module's charge level and state. By measuring the potential difference across the battery module, the battery's charge status can be determined. A higher voltage generally indicates sufficient charge, while a lower voltage may mean the battery module is low on charge or in a depleted state.

[0056] Step B2: If the current voltage is less than the reference voltage, it is determined that the battery module in the energy storage battery is in a reference depleted state during the current detection stage. The reference voltage is the lower limit voltage that is forcibly output from the energy storage inverter to the battery management system (BMS) to support the BMS in entering the reference operating state.

[0057] Step B3: If the current voltage is not less than the reference voltage, then it is determined that the battery module in the energy storage battery is not in the reference depleted state during the current detection stage.

[0058] See Figure 2 and Figure 3 The reference voltage is the lower limit voltage that the energy storage inverter forces to output to the BMS, enabling the BMS to enter a reference operating state. The current voltage is compared with the reference voltage. If the current voltage is lower than the reference voltage, it indicates that the battery module's charge is very low, below the minimum voltage level required for normal BMS operation. In this case, the battery module is considered to be in a reference depleted state during the current detection phase. If the current voltage is greater than or equal to the reference voltage, it indicates that the battery module has sufficient charge to meet the normal operating requirements of the BMS. In this case, the battery module is not considered to be in a reference depleted state during the current detection phase.

[0059] S130. If the battery module in the energy storage battery is in a reference depleted state during the current detection stage, the battery performance of the battery module in the energy storage battery is detected to obtain the target detection result. The target detection result is used to indicate whether the battery module has been damaged and the battery damage location result when the battery module has been damaged.

[0060] See Figure 2 and Figure 3 If the current voltage of the battery module is detected to be lower than the reference voltage (the lower limit of the BMS's operating voltage, Vmin), the BMS will determine that the battery module is in a reference low-charge state. In this case, the BMS will immediately enter the battery performance detection process, using a series of detection methods to determine the specific condition of the battery, that is, to determine whether the battery module has been damaged and, if so, to locate the damage, so as to take appropriate measures to repair or treat the battery module of the energy storage battery. If the current voltage of the battery module is greater than or equal to the reference voltage (the lower limit of the BMS's operating voltage, Vmin), it means that the battery voltage meets the BMS's operating requirements. However, at this time, there may be other reasons in the charging and discharging circuit that cause the BMS to lose power. In this case, the BMS will report a charging and discharging circuit fault to the energy storage inverter PCS. The fault information of the charging and discharging circuit formed between the energy storage inverter and the battery module is transmitted to the APP associated with the energy storage inverter PCS via cloud technology for alert. At the same time, the PCS will control the backup switch to disconnect to ensure the safety and stability of the energy storage battery.

[0061] The technical solution of this invention addresses the issue of a Battery Management System (BMS) failing to function properly due to unexpected power outages or malfunctions. By supplying voltage to the BMS via an energy storage inverter, the BMS is powered on and restarted. This increases the system's flexibility and operability, allowing for rapid and effective restart when a dedicated external power source is unavailable or traditional restart methods are not feasible, thus restoring battery management and monitoring functions. After the BMS restarts, it detects whether the battery modules in the energy storage battery are in a reference depleted state, quickly determining whether the battery modules have over-discharged to a dangerous state below a preset battery capacity threshold, thus providing a basis for subsequent battery performance testing. It can detect and provide clear preconditions; for battery modules in a reference depleted state, it can accurately indicate whether the battery module has been damaged, which helps to take timely repair or replacement measures and avoid affecting the normal operation of the entire energy storage system due to battery damage. Moreover, when the battery module is damaged, it can provide the battery damage location result, which can quickly and accurately find the damaged part, improve repair efficiency, and reduce repair costs. It solves the problem that after the energy storage battery has been depleted for a long time, it is impossible to know whether the battery is damaged due to depletion, and the safety risks will be brought about by charging rashly. It realizes the ability to judge the condition and performance of the battery without disassembly or external means.

[0062] Figure 4 This is a flowchart illustrating another energy storage battery testing method provided by an embodiment of the present invention. The technical solution of this embodiment further optimizes the process of testing the battery performance of the battery module in the energy storage battery to obtain the target test result based on the technical solution of the above embodiment. This embodiment can be combined with various optional solutions in one or more of the above embodiments.

[0063] like Figure 4 As shown, the energy storage battery testing method of this invention may include the following process:

[0064] S410: Output voltage to the Battery Management System (BMS) to restart the BMS. The energy storage battery includes the battery module and the BMS.

[0065] S420. After the battery management system (BMS) restarts, it checks whether the battery module in the energy storage battery is in a reference depleted state during the current detection phase. The reference depleted state is the state in which the battery module's charge is consumed to a level lower than the preset battery charge threshold after excessive discharge.

[0066] S430. If the battery module in the energy storage battery is in a reference depleted state during the current detection stage, then determine the current pressure of the battery module in the energy storage battery during the current detection stage. The current pressure is the pressure of the battery module end plate collected by the pressure sensor during the current detection stage.

[0067] S440. If the difference between the current pressure and the reference pressure is not less than the preset pressure difference, it is determined that the battery module in the energy storage battery is not only in a reference depleted state in the current detection stage, but has also experienced the first type of battery damage. The reference pressure is the pressure of the battery module end plate collected by the pressure sensor in the reference detection stage. The reference detection stage is the process of charging the battery module when the battery module is not in a reference depleted state. The first type of battery damage is the battery structure damage caused by the change in the physical state of the electrolyte in the battery.

[0068] S450. If the difference between the current pressure and the reference pressure is less than the preset pressure difference, it is determined that the battery module in the energy storage battery is in a reference depleted state in the current detection stage but has not experienced the first type of battery damage.

[0069] See Figure 2 and Figure 3When it is determined that the battery module in the energy storage battery is in a reference depleted state, it is necessary to further determine the current pressure of the battery module in the current detection stage. This current pressure is the pressure of the battery module end plate during the current detection stage, collected by a pressure sensor. The function of the pressure sensor is to monitor the pressure changes inside the battery module in real time. The reference pressure is a specific pressure value obtained by the pressure sensor, and this pressure reflects the pressure situation of the battery module end plate under the reference detection stage. The reference detection stage refers to the process of charging the battery module when it is not in a reference depleted state. In other words, during this stage, the battery module has relatively sufficient power and has not reached the level of depletion.

[0070] By collecting pressure data at the battery module's endplate during the reference testing phase, a reference pressure value can be determined. This value serves as a crucial basis for subsequent assessment of the battery module's condition. When the battery module is in other testing phases, the current pressure can be compared with the reference pressure to determine if any abnormalities have occurred. If, during the current testing phase, the battery module's pressure differs significantly from the reference pressure, it may indicate a problem with the battery module. For example, internal physical or chemical changes may have occurred, leading to the pressure alteration. Such changes could be related to factors such as battery damage, aging, or changes in the electrolyte's state.

[0071] If the difference between the current pressure and the reference pressure is not less than the preset pressure difference, it can be determined that the battery module in the energy storage battery is not only in a depleted state at the current testing stage, but has also experienced Type I battery damage. Type I battery damage can refer to structural damage to the battery caused by changes in the physical state of the electrolyte. For example, the electrolyte may undergo physical state changes such as solidification, expansion, or leakage under certain conditions, resulting in damage to the internal structure of the battery and affecting its performance and safety. If the difference between the current pressure and the reference pressure is less than the preset pressure difference, it indicates that although the battery module in the energy storage battery is in a depleted state at the current testing stage, it has not experienced Type I battery damage.

[0072] For example, see Figure 2 and Figure 3The BMS reads the real-time reading p1 from the pressure sensor and compares it meticulously with the standby reference pressure p2 stored in the storage module. If the difference between p1 and p2 is greater than or equal to the preset pressure difference threshold pt, it means that the real-time pressure of the current battery module has changed significantly compared to the pressure during normal operation. In this case, it is very likely that the battery has swelled or leaked. At this time, the BMS will determine that the battery module is damaged. To promptly alert the user, the BMS will generate audible alerts and warning lights through the alarm module. The BMS will also report the battery damage information to the PCS. After receiving the information, the PCS will transmit the detailed information of the battery damage to the user's APP via the cloud for reminder. After completing these operations, it will exit the detection process and disconnect the backup switch to ensure the safety and stability of the system. If the difference between p1 and p2 is less than the preset pressure difference threshold pt, the BMS will determine that the battery is in a depleted state but not damaged. In this case, the BMS will enter the next detection stage to continue to comprehensively evaluate the battery performance to determine the specific condition of the battery and take appropriate measures.

[0073] By monitoring the pressure of the battery module, it is possible to determine whether the battery has suffered specific types of damage. This method provides a new approach to accurately diagnosing battery problems, helping to quickly determine the cause and severity of battery failures. In practical applications, if it can be determined in a timely manner that the battery's structural damage is caused by changes in the physical state of the electrolyte, targeted repair measures can be taken to prevent the problem from escalating. Timely detection of battery damage, especially damage related to changes in the physical state of the electrolyte, can reduce the risk of battery safety accidents.

[0074] As an optional but not limited implementation, after determining that the battery module in the energy storage battery is in a reference depleted state but has not experienced type I battery damage at the current detection stage, the following steps C1-C4 are also included:

[0075] Step C1: Control the closing and opening of the charge / discharge switch in the energy storage battery and the backup switch in the energy storage battery to form a charge / discharge circuit between the energy storage inverter battery modules and to disconnect the charge / discharge circuit between the energy storage inverter and the battery management system (BMS).

[0076] Step C2: Charge the battery module in the energy storage battery with a preset current through the energy storage inverter, and detect the replenished cell voltage of each cell in the battery module. The replenished cell voltage is the potential difference between the positive and negative terminals of the cell in the battery module after the preset charging time has been completed in the current detection stage.

[0077] Step C3: If at least one cell in the battery module has a replenished cell voltage that is lower than the cell over-discharge protection voltage of the battery module, then it is determined that the battery module in the energy storage battery is not only in a reference depleted state at the current detection stage, but has also experienced a second type of battery damage. The second type of battery damage is the damage caused by the degradation of battery charging and discharging performance due to the decay of the activity of the internal materials of the battery.

[0078] Step C4: If the replenished cell voltage of all cells in the battery module is not less than the cell over-discharge protection voltage of the battery module, then it is determined that although the battery module in the energy storage battery is in a reference low-charge state at the current detection stage, no second type of battery damage has occurred.

[0079] See Figure 2 and Figure 3 The system closes the charge / discharge switch in the energy storage battery and simultaneously disconnects the backup switch in the energy storage battery, thereby forming a charge / discharge circuit between the energy storage inverter and the battery module, and disconnecting the charge / discharge circuit between the energy storage inverter and the battery management system (BMS). This operation ensures that the energy storage inverter can directly charge the battery module without affecting the normal operation of the BMS or avoiding unnecessary interference.

[0080] See Figure 2 and Figure 3 The system uses an energy storage inverter to charge the battery modules in the energy storage battery with a preset current, while simultaneously detecting the replenished cell voltage of each cell in the battery module. The replenished cell voltage refers to the potential difference between the positive and negative terminals of the cells in the battery module after a preset charging time during the current detection phase.

[0081] See Figure 2 and Figure 3 The cell over-discharge protection voltage is the minimum voltage value set to prevent over-discharge of cells in the battery module. When the voltage of a cell in the battery module drops to the over-discharge protection voltage, the protection circuit will activate and cut off the discharge circuit to prevent irreversible damage to the cells due to over-discharge. If the replenished cell voltage of at least one cell in the battery module is lower than the cell over-discharge protection voltage of the battery module, it is determined that the battery module in the energy storage battery is not only in a reference low-charge state at the current detection stage, but has also experienced type II battery damage. Type II battery damage is damage caused by the degradation of battery charge and discharge performance due to the decay of the activity of internal battery materials. If the replenished cell voltage of all cells in the battery module is not lower than the cell over-discharge protection voltage of the battery module, it is determined that the battery module in the energy storage battery is in a reference low-charge state at the current detection stage, but has not experienced type II battery damage.

[0082] Among them, see Figure 3The second type of battery damage involves a decline in charge / discharge capacity due to the degradation of the activity of internal materials, meaning that even after recharging, the cell voltage cannot return to the normal operating voltage limit. Specifically, this manifests as a degradation of the activity of the internal materials of the battery module's cells, preventing the cell voltage from returning to the normal operating voltage limit after recharging. This type of battery module damage may be caused by factors such as long-term use, over-discharge, and high temperatures, which alter the structure and performance of the battery's internal chemical substances, thus affecting the battery's charge / discharge capacity and voltage performance. This type of damage is usually gradual, worsening over time and with changes in usage conditions. Once the BMS determines that the battery is damaged, it may be necessary to repair or replace the battery to ensure the normal operation and safety of the system.

[0083] For example, the BMS sends a request to the PCS for low-current charging (approximately 0.01C). Then, it closes the charge / discharge switch in the energy storage battery while simultaneously disconnecting the battery's backup switch, boosting the output voltage to the typical operating voltage of the BMS. The charging time is set to a preset charging time t. After this preset charging time t, the BMS compares the voltage of all cells with the cell over-discharge protection voltage. If any cell's voltage is lower than the cell over-discharge protection voltage, it indicates that even after a period of charging, the voltage of these cells in the current battery module has not recovered to the lower limit of the normal operating voltage. In this case, it is highly likely that the activity of the battery's internal materials has significantly decreased. The BMS determines that the battery is damaged. To issue a timely alarm, the BMS uses an alarm module to generate audible alerts and visual warning lights. Simultaneously, the BMS reports the corresponding battery damage information to the PCS. Upon receiving the information, the PCS transmits the battery damage information to the user's app via the cloud for notification. Then, it exits the detection process and disconnects the backup switch to ensure the system's safety and stability. If the voltage of all cells in the battery module is greater than or equal to the cell over-discharge protection voltage, the BMS will determine that the battery's voltage recovery performance is not problematic. In this case, the BMS will proceed to the next testing stage to further evaluate the battery's performance in order to fully understand the battery's condition and take appropriate measures.

[0084] By charging the battery module with a specific current and detecting the voltage of each cell after charging, it is possible to accurately determine whether the battery has suffered damage due to the degradation of its charge-discharge performance caused by the decline in the activity of internal materials. This method provides a specific and effective means for battery fault diagnosis, enabling timely detection of battery depletion and damage, preventing continued use of the battery in an unsafe state, and reducing the risk of battery failures such as overheating, fire, and explosion.

[0085] As an optional but not limited implementation, after determining that the battery module in the energy storage battery is in a reference depleted state but has not shown any second-type battery damage at the current detection stage, the following steps D1-D4 are also included:

[0086] Step D1: Detect the current charging characteristic data of the battery module in the energy storage battery during the current detection stage. The charging characteristic data is the change of voltage and temperature of the battery cells in the battery module with current during the charging process.

[0087] Step D2: Determine the reference charging characteristic data of the battery module in the energy storage battery during the reference detection phase of the charging process. The reference detection phase is the process of charging the battery module when the battery module is not in the reference depleted state.

[0088] Step D3: If the feature difference between the current charging feature data and the reference charging feature data is not less than the preset feature difference, then it is determined that the battery module in the energy storage battery is not only in the reference depleted state in the current detection stage, but also has experienced the third type of battery damage. The third type of battery damage is caused by a significant change in the internal electrochemical state of the battery, which leads to abnormal voltage and temperature changes.

[0089] Step D4: If the feature difference between the current charging feature data and the reference charging feature data is less than the preset feature difference, then it is determined that although the battery module in the energy storage battery is in a reference depleted state in the current detection stage, no third type of battery damage has occurred.

[0090] See Figure 2 and Figure 3 This involves detecting the current charging characteristic data of the battery module in the energy storage battery during the current testing phase. The charging characteristic data includes the voltage and temperature changes of the battery cells within the battery module as a function of current during a charge-discharge cycle. These data reflect the electrical and thermal characteristics of the battery during charging. A charge-discharge cycle refers to the complete process of the battery module going from a fully charged state to a fully discharged state and then back to a fully discharged state for recharging.

[0091] See Figure 2 and Figure 3The reference testing phase refers to the process of charging the battery module when it is not in a reference depleted state. The charging characteristic data during the reference testing phase can serve as a benchmark for comparison. If the characteristic difference between the current charging characteristic data and the reference charging characteristic data is not less than a preset characteristic difference, it is determined that the battery module in the energy storage battery is not only in a reference depleted state during the current testing phase, but has also exhibited type III battery damage. Type III battery damage is caused by a significant change in the internal electrochemical state of the battery, leading to abnormal voltage and temperature changes. If the characteristic difference between the current charging characteristic data and the reference charging characteristic data is less than a preset characteristic difference, it is determined that the battery module in the energy storage battery is in a reference depleted state during the current testing phase, but has not exhibited type III battery damage.

[0092] The third type of battery damage involves performance degradation and changes in internal structure. Specifically, it manifests as significant changes in electrical properties. A change in the OCV (open-circuit voltage) curve usually indicates a significant alteration in the battery's internal electrochemical state, potentially caused by electrode material aging, loss of active materials, or electrolyte decomposition. Significant changes in temperature rise may be due to increased internal resistance, generating more heat during charging and discharging, or internal faults such as partial short circuits leading to abnormal heat accumulation. This type of damage can affect battery safety, reliability, and lifespan. Once the BMS (Battery Management System) determines the battery is damaged, further testing and evaluation are usually required to determine the extent of the damage and whether it can be repaired. If the damage is severe, battery replacement may be necessary to ensure the system's normal operation.

[0093] For example, the BMS reads the charging characteristic data recorded during a charge-discharge cycle in the reference detection phase from the storage module. Then, it requests charging from the PCS according to the current data during the charging process in that charge-discharge cycle. During charging, the BMS monitors the voltage-current curve (VI) and temperature-current curve (TI) of each cell in real time. Furthermore, throughout the charging process, the BMS compares the current charging characteristic data corresponding to the voltage-current and temperature-current curves with the curves corresponding to the reference charging characteristic data. If, during the entire process, the characteristic difference between the voltage-current and temperature-current curves and the curves corresponding to the reference charging characteristic data is greater than or equal to the preset pressure characteristic difference threshold (Vt) and temperature characteristic difference threshold (Tt), it means that the electrical properties of this part of the cell in the current battery module have changed significantly. Compared with a normal cell, the open-circuit voltage (OCV) curve and temperature rise have changed significantly. In this case, the BMS determines that the battery is damaged. To promptly alert the user, the BMS will generate audible alerts and warning lights through the alarm module. Simultaneously, the BMS reports the corresponding battery damage information to the PCS. Upon receiving the information, the PCS transmits the battery damage information to the user's app via the cloud for notification. Then, it exits the testing process and disconnects the backup switch to ensure safety and stability. If, throughout the entire process, the voltage versus current curve and the temperature versus current curve are lower than the pressure characteristic difference threshold Vt and temperature characteristic difference threshold Tt, respectively, compared to the curves corresponding to the reference charging characteristic data, the BMS determines that the battery module's electrical performance is not problematic. In this case, the BMS will proceed to the next battery performance testing stage to further comprehensively evaluate the battery module's performance, determine the specific condition of the battery, and take appropriate measures.

[0094] By comparing current charging characteristic data with reference charging characteristic data, it is possible to accurately determine whether the battery has experienced Type III damage due to changes in its internal electrochemical state. This method allows for in-depth analysis of battery performance changes, providing a more precise basis for battery fault diagnosis. Monitoring voltage and temperature changes during battery charging can promptly detect abnormal changes in the battery's internal electrochemical state, providing early warnings of potential battery failures. This helps prevent sudden battery failure during use and improves system reliability and stability. Based on battery charging characteristic data, battery management strategies can be optimized. For example, for batteries that have already shown signs of damage, charging parameters can be adjusted to prevent further damage; for batteries that are not damaged but are in a depleted state, appropriate charging methods can be adopted to improve charging efficiency and battery life.

[0095] As an optional but not limited implementation, after determining that the battery module in the energy storage battery is in a reference depleted state but has not experienced any type III battery damage during the current detection phase, the following steps E1-E3 are also included:

[0096] Step E1: Detect the current full charge capacity of the battery module in the energy storage battery when it is fully charged during the current detection phase of charging, and determine the reference full charge capacity of the battery module in the energy storage battery when it is fully charged during the reference detection phase of charging.

[0097] Step E2: If the current full charge capacity is less than a preset percentage of the reference full charge capacity, it is determined that the battery module in the energy storage battery is not only in a reference depleted state in the current detection stage, but has also experienced a fourth type of battery damage. The fourth type of battery damage is caused by problems with the efficiency and stability of the chemical reaction occurring inside the battery module, which leads to a reduction in the energy storage performance of the battery module.

[0098] Step E3: If the current full charge capacity is not less than the preset percentage of the reference full charge capacity, it is determined that although the battery module in the energy storage battery is in a reference low charge state in the current detection stage, the battery module has not been damaged.

[0099] See Figure 2 and Figure 3 The system detects the current full-charge capacity of the battery module in the energy storage battery when it is fully charged during the current testing phase. Simultaneously, it determines the reference full-charge capacity of the battery module when it is fully charged during a reference testing phase. The reference testing phase typically refers to the charging phase when the battery module is under normal conditions (not in an abnormal state such as a reference depleted state), and its full-charge capacity serves as a benchmark.

[0100] See Figure 2 and Figure 3 If the current full charge capacity is less than a preset percentage of the reference full charge capacity, it is determined that the battery module in the energy storage battery is not only in a reference depleted state at the current testing stage, but has also experienced Type IV battery damage. If the current full charge capacity is not less than a preset percentage of the reference full charge capacity, it is determined that although the battery module in the energy storage battery is in a reference depleted state at the current testing stage, the battery module has not been damaged. Type IV battery damage is caused by problems with the efficiency and stability of the chemical reactions occurring inside the battery module, leading to a reduction in the battery module's energy storage performance.

[0101] Optionally, the fourth type of battery damage primarily occurs when the actual amount of electricity the battery module can store and release (usable capacity) decreases to below 60% of its initial state (new condition or state before performance degradation). This indicates a significant reduction in the battery module's ability to store energy as usage time increases or due to certain adverse factors. For example, a battery module that could previously provide 1000 watt-hours of power when fully charged may now only provide less than 600 watt-hours. A significant reduction in chemical performance signifies serious problems with the efficiency and stability of the chemical reactions occurring within the battery module.

[0102] By comparing the current full charge capacity with a preset percentage of a reference full charge capacity, it is possible to accurately determine whether the battery module has experienced Type IV damage due to internal chemical reaction efficiency and stability issues. This method provides specific quantitative indicators for battery fault diagnosis, helping to quickly determine the severity of battery problems. By monitoring changes in the full charge capacity of the battery module, it is possible to detect a decline in the battery module's energy storage performance in a timely manner, providing early warnings of potential battery failures. This helps to take measures in the early stages of battery performance degradation, extending battery life and preventing sudden battery failure during use. Based on the full charge capacity of the battery module, battery management strategies can be optimized. For example, for battery modules with a significant decrease in full charge capacity, their charging and discharging current or frequency can be reduced to slow down the aging process; for battery modules that are not damaged but are in a depleted state, appropriate charging methods can be adopted to improve charging efficiency and battery life.

[0103] For example, after the BMS completes a full charge in one charge-discharge cycle during the current detection phase, it calculates the current full charge capacity. Then, it compares the current full charge capacity with the reference full charge capacity after a full charge in one charge-discharge cycle during the reference detection phase. If the current full charge capacity is less than 60% of the reference full charge capacity, it indicates that the usable capacity of the battery module is less than 60% of its original capacity. In this case, it means that the battery's chemical performance has significantly decreased. At this point, the BMS will determine that the battery is damaged. To promptly alert the user, the BMS will generate audible alerts and warning lights through its alarm module. Simultaneously, the BMS will report the corresponding battery damage information to the PCS. Upon receiving the information, the PCS will transmit the battery damage information to the user's app via the cloud for notification. Then, it exits the detection process and disconnects the backup switch to ensure system safety and stability. If the current full charge capacity is greater than or equal to 60% of the reference full charge capacity throughout the entire process, the BMS will refresh the current battery health and determine that the battery is in a normal state. In this situation, the BMS will exit the battery performance testing process, indicating that the battery has not been found to have serious problems and can continue to be used normally.

[0104] The technical solution of this invention addresses the issue of a Battery Management System (BMS) failing to function properly due to unexpected power outages or malfunctions. By supplying voltage to the BMS via an energy storage inverter, the BMS is powered on and restarted. This increases the system's flexibility and operability, allowing for rapid and effective restart when a dedicated external power source is unavailable or traditional restart methods are not feasible, thus restoring battery management and monitoring functions. After the BMS restarts, it detects whether the battery modules in the energy storage battery are in a reference depleted state, quickly determining whether the battery modules have over-discharged to a dangerous state below a preset battery capacity threshold, thus providing a basis for subsequent battery performance testing. It can detect and provide clear preconditions; for battery modules in a reference depleted state, it can accurately indicate whether the battery module has been damaged, which helps to take timely repair or replacement measures and avoid affecting the normal operation of the entire energy storage system due to battery damage. Moreover, when the battery module is damaged, it can provide the battery damage location result, which can quickly and accurately find the damaged part, improve repair efficiency, and reduce repair costs. It solves the problem that after the energy storage battery has been depleted for a long time, it is impossible to know whether the battery is damaged due to depletion, and the safety risks will be brought about by charging rashly. It realizes the ability to judge the condition and performance of the battery without disassembly or external means.

[0105] Figure 5 This is a schematic diagram of the structure of an energy storage battery testing device provided in an embodiment of the present invention. This embodiment can be applied to situations where it is possible to determine whether a battery is damaged due to depletion without disassembly or external means. The energy storage battery testing device can be implemented in hardware and / or software and can be configured in any electronic device with network communication function.

[0106] like Figure 5 As shown, the energy storage battery testing device provided in this embodiment may include the following:

[0107] The power-on startup module 510 is used to output voltage to the battery management system (BMS) to restart the BMS.

[0108] The low-power detection module 520 is used to detect whether the battery module in the energy storage battery is in a reference low-power state during the current detection stage after the battery management system (BMS) is restarted. The reference low-power state is the state in which the battery module's power is consumed to a level lower than a preset battery power threshold after excessive discharge.

[0109] The performance detection module 530 is used to detect the battery performance of the battery module in the energy storage battery if the battery module in the energy storage battery is in a reference depleted state during the current detection stage, and obtain a target detection result. The target detection result is used to indicate whether the battery module has been damaged and the battery damage location result when the battery module has been damaged.

[0110] Based on the above embodiments, optionally, powering on and restarting the battery management system (BMS) by outputting voltage to the BMS includes:

[0111] In response to a control command sent to the backup switch in the energy storage battery via the dry contact of the energy storage inverter, the backup switch in the energy storage battery is closed, forming a charging and discharging circuit between the energy storage inverter and the battery management system (BMS).

[0112] By forming a charging and discharging circuit between the energy storage inverter and the battery management system (BMS), a reference voltage is received from the energy storage inverter to the battery management system (BMS). The reference voltage is a lower limit voltage that can support the battery management system (BMS) to enter a reference operating state.

[0113] Based on the reference voltage output by the energy storage inverter to the battery management system (BMS), the BMS is restarted by power-on.

[0114] Based on the above embodiments, optionally, detecting whether the battery module in the energy storage battery is in a reference depleted state during the current detection stage includes:

[0115] The battery management system (BMS) in the energy storage battery detects the current voltage of the battery module included in the energy storage battery during the current detection phase. The current voltage is used to indicate the potential difference between the two ends of the battery module used to connect the positive and negative terminals of the energy storage inverter during the current detection phase.

[0116] If the current voltage is less than the reference voltage, it is determined that the battery module in the energy storage battery is in a reference depleted state during the current detection stage. The reference voltage is the lower limit voltage that is forcibly output from the energy storage inverter to the battery management system (BMS) to support the BMS in entering the reference operating state.

[0117] If the current voltage is not less than the reference voltage, it is determined that the battery module in the energy storage battery is not in the reference depleted state during the current detection stage.

[0118] Based on the above embodiments, optionally, the battery performance of the battery module in the energy storage battery is tested to obtain the target test result, including:

[0119] Determine the current pressure of the battery module in the energy storage battery during the current detection stage. The current pressure is the pressure of the battery module end plate collected by the pressure sensor during the current detection stage.

[0120] If the difference between the current pressure and the reference pressure is not less than the preset pressure difference, it is determined that the battery module in the energy storage battery is not only in a reference depleted state in the current detection stage, but has also experienced the first type of battery damage. The reference pressure is the pressure of the battery module end plate collected by the pressure sensor in the reference detection stage. The reference detection stage is the process of charging the battery module when it is not in a reference depleted state. The first type of battery damage is battery structural damage caused by changes in the physical state of the electrolyte in the battery.

[0121] If the difference between the current pressure and the reference pressure is less than the preset pressure difference, it is determined that the battery module in the energy storage battery is in a reference depleted state at the current detection stage, but no first type of battery damage has occurred.

[0122] Based on the above embodiments, optionally, after determining that the battery module in the energy storage battery is in a reference depleted state but has not experienced the first type of battery damage at the current detection stage, the method further includes:

[0123] The control opens and closes the charge / discharge switch in the energy storage battery and opens the backup switch in the energy storage battery, forming a charge / discharge circuit between the energy storage inverter battery modules and disconnecting the charge / discharge circuit between the energy storage inverter and the battery management system (BMS).

[0124] The battery module in the energy storage battery is charged with a preset current by the energy storage inverter, and the replenished cell voltage of each cell in the battery module is detected. The replenished cell voltage is the potential difference between the positive and negative terminals of the cell in the battery module after a preset charging time in the current detection stage.

[0125] If at least one cell in the battery module has a replenished cell voltage that is lower than the cell over-discharge protection voltage of the battery module, then it is determined that the battery module in the energy storage battery is not only in a reference depleted state at the current detection stage, but has also experienced a second type of battery damage. The second type of battery damage is the damage caused by the degradation of battery charge and discharge performance due to the decay of the activity of internal battery materials.

[0126] If the replenished cell voltage of all cells in the battery module is not less than the cell over-discharge protection voltage of the battery module, then it is determined that although the battery module in the energy storage battery is in a reference depleted state at the current detection stage, no second type of battery damage has occurred.

[0127] Based on the above embodiments, optionally, after determining that the battery module in the energy storage battery is in a reference depleted state but has not experienced the second type of battery damage at the current detection stage, the method further includes:

[0128] The current charging characteristic data of the battery module in the energy storage battery during the current testing stage is detected. The charging characteristic data is the change of voltage and temperature of the battery cell in the battery module with current during the charging process.

[0129] Determine reference charging characteristic data of the battery module in the energy storage battery during the reference detection phase of the charging process, wherein the reference detection phase is the process of charging the battery module when the battery module is not in a reference depleted state;

[0130] If the feature difference between the current charging feature data and the reference charging feature data is not less than the preset feature difference, then it is determined that the battery module in the energy storage battery is not only in the reference depleted state in the current detection stage, but also has a third type of battery damage. The third type of battery damage is caused by a significant change in the electrochemical state inside the battery, which leads to abnormal voltage and temperature changes in the battery.

[0131] If the feature difference between the current charging feature data and the reference charging feature data is less than the preset feature difference, it is determined that although the battery module in the energy storage battery is in a reference depleted state at the current detection stage, no third type of battery damage has occurred.

[0132] Based on the above embodiments, optionally, after determining that the battery module in the energy storage battery is in a reference depleted state but has not experienced any third type of battery damage during the current detection stage, the method further includes:

[0133] The current full charge capacity of the battery module in the energy storage battery when it is fully charged during the current testing phase is detected, and the reference full charge capacity of the battery module in the energy storage battery when it is fully charged during the reference testing phase is determined.

[0134] If the current full charge capacity is less than a preset percentage of the reference full charge capacity, it is determined that the battery module in the energy storage battery is not only in a reference depleted state at the current detection stage, but has also experienced a fourth type of battery damage. The fourth type of battery damage is caused by problems with the efficiency and stability of the chemical reaction occurring inside the battery module, which leads to a reduction in the energy storage performance of the battery module.

[0135] If the current full charge capacity is not less than the preset percentage of the reference full charge capacity, it is determined that although the battery module in the energy storage battery is in a reference low charge state at the current detection stage, the battery module has not been damaged.

[0136] The technical solution of this invention addresses the issue of a Battery Management System (BMS) failing to function properly due to unexpected power outages or malfunctions. By supplying voltage to the BMS via an energy storage inverter, the BMS is powered on and restarted. This increases the system's flexibility and operability, allowing for rapid and effective restart when a dedicated external power source is unavailable or traditional restart methods are not feasible, thus restoring battery management and monitoring functions. After the BMS restarts, it detects whether the battery modules in the energy storage battery are in a reference depleted state, quickly determining whether the battery modules have over-discharged to a dangerous state below a preset battery capacity threshold, thus providing a basis for subsequent battery performance testing. It can detect and provide clear preconditions; for battery modules in a reference depleted state, it can accurately indicate whether the battery module has been damaged, which helps to take timely repair or replacement measures and avoid affecting the normal operation of the entire energy storage system due to battery damage. Moreover, when the battery module is damaged, it can provide the battery damage location result, which can quickly and accurately find the damaged part, improve repair efficiency, and reduce repair costs. It solves the problem that after the energy storage battery has been depleted for a long time, it is impossible to know whether the battery is damaged due to depletion, and the safety risks will be brought about by charging rashly. It realizes the ability to judge the condition and performance of the battery without disassembly or external means.

[0137] The energy storage battery testing device provided in this embodiment of the invention can execute the energy storage battery testing method provided in any embodiment of the invention, and has the corresponding functional modules and beneficial effects for executing the energy storage battery testing method.

[0138] It is worth noting that the various units and modules included in the above-mentioned device are only divided according to functional logic, but are not limited to the above division, as long as the corresponding functions can be realized; in addition, the specific names of each functional unit are only for easy differentiation and are not used to limit the protection scope of the embodiments of the present invention.

[0139] Figure 6 A schematic diagram of an electronic device that can be used to implement the energy storage battery detection method of embodiments of the present invention is shown. The electronic device is intended to represent various forms of digital computers, such as laptop computers, desktop computers, workbenches, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The electronic device can also represent various forms of mobile devices, such as personal digital processors, cellular phones, smartphones, wearable devices (e.g., helmets, glasses, watches, etc.), and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely illustrative and are not intended to limit the implementation of the invention described and / or claimed herein.

[0140] like Figure 6As shown, the electronic device 10 includes at least one processor 11 and a memory, such as a read-only memory (ROM) 12 or a random access memory (RAM) 13, communicatively connected to the at least one processor 11. The memory stores computer programs executable by the at least one processor. The processor 11 can perform various appropriate actions and processes based on the computer program stored in the ROM 12 or loaded from storage unit 18 into the RAM 13. The RAM 13 can also store various programs and data required for the operation of the electronic device 10. The processor 11, ROM 12, and RAM 13 are interconnected via a bus 14. An input / output (I / O) interface 15 is also connected to the bus 14.

[0141] Multiple components in electronic device 10 are connected to I / O interface 15, including: input unit 16, such as keyboard, mouse, etc.; output unit 17, such as various types of displays, speakers, etc.; storage unit 18, such as disk, optical disk, etc.; and communication unit 19, such as network card, modem, wireless transceiver, etc. Communication unit 19 allows electronic device 10 to exchange information / data with other devices through computer networks such as the Internet and / or various telecommunications networks.

[0142] Processor 11 can be a variety of general-purpose and / or special-purpose processing components with processing and computing capabilities. Some examples of processor 11 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various special-purpose artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, a digital signal processor (DSP), and any suitable processor, controller, microcontroller, etc. Processor 11 performs the various methods and processes described above, such as energy storage battery detection methods.

[0143] In some embodiments, the energy storage battery detection method may be implemented as a computer program tangibly contained in a computer-readable storage medium, such as storage unit 18. In some embodiments, part or all of the computer program may be loaded and / or installed on electronic device 10 via ROM 12 and / or communication unit 19. When the computer program is loaded into RAM 13 and executed by processor 11, one or more steps of the energy storage battery detection method described above may be performed. Alternatively, in other embodiments, processor 11 may be configured to perform the energy storage battery detection method by any other suitable means (e.g., by means of firmware).

[0144] Various embodiments of the systems and techniques described above herein can be implemented in digital electronic circuit systems, integrated circuit systems, field-programmable gate arrays (FPGAs), application-specific integrated circuits (ASICs), application-specific standard products (ASSPs), systems-on-a-chip (SoCs), payload-programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various embodiments may include implementations in one or more computer programs that can be executed and / or interpreted on a programmable system including at least one programmable processor, which may be a dedicated or general-purpose programmable processor, capable of receiving data and instructions from a storage system, at least one input device, and at least one output device, and transmitting data and instructions to the storage system, the at least one input device, and the at least one output device.

[0145] Computer programs used to implement the methods of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, such that when executed by the processor, the computer programs cause the functions / operations specified in the flowcharts and / or block diagrams to be performed. The computer programs may be executed entirely on a machine, partially on a machine, or as a standalone software package, partially on a machine and partially on a remote machine, or entirely on a remote machine or server.

[0146] In the context of this invention, a computer-readable storage medium can be a tangible medium that may contain or store a computer program for use by or in conjunction with an instruction execution system, apparatus, or device. A computer-readable storage medium may include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, apparatus, or devices, or any suitable combination thereof. Alternatively, a computer-readable storage medium may be a machine-readable signal medium. More specific examples of machine-readable storage media include electrical connections based on one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fibers, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof.

[0147] To provide interaction with a user, the systems and techniques described herein can be implemented on an electronic device having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to the user; and a keyboard and pointing device (e.g., a mouse or trackball) through which the user provides input to the electronic device. Other types of devices can also be used to provide interaction with the user; for example, feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user can be received in any form (including sound input, voice input, or tactile input).

[0148] The systems and technologies described herein can be implemented in computing systems that include backend components (e.g., as data servers), or computing systems that include middleware components (e.g., application servers), or computing systems that include frontend components (e.g., user computers with graphical user interfaces or web browsers through which users can interact with implementations of the systems and technologies described herein), or any combination of such backend, middleware, or frontend components. The components of the system can be interconnected via digital data communication of any form or medium (e.g., communication networks). Examples of communication networks include local area networks (LANs), wide area networks (WANs), blockchain networks, and the Internet.

[0149] A computing system can include clients and servers. Clients and servers are generally located far apart and typically interact through communication networks. The client-server relationship is created by computer programs running on the respective computers and having a client-server relationship with each other. The server can be a cloud server, also known as a cloud computing server or cloud host, which is a hosting product within the cloud computing service system to address the shortcomings of traditional physical hosts and VPS services, such as high management difficulty and weak business scalability.

[0150] It should be understood that the various forms of processes shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this invention can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this invention can be achieved, and this is not limited herein.

[0151] 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 method for testing an energy storage battery, wherein the energy storage battery includes a battery module and a battery management system (BMS), characterized in that, The method includes: Output voltage to the Battery Management System (BMS) to power on and restart the BMS; After the battery management system (BMS) restarts, it checks whether the battery module in the energy storage battery is in a reference depleted state during the current detection phase. The reference depleted state is the state in which the battery module's charge is consumed to a level below a preset battery charge threshold after excessive discharge. If the battery module in the energy storage battery is in a reference depleted state during the current detection stage, the battery performance of the battery module in the energy storage battery is detected to obtain the target detection result. The target detection result is used to indicate whether the battery module has been damaged and the battery damage location result when the battery module has been damaged.

2. The method according to claim 1, characterized in that, Sending voltage output to the Battery Management System (BMS) will power on and restart the BMS, including: In response to a control command sent to the backup switch in the energy storage battery via the dry contact of the energy storage inverter, the backup switch in the energy storage battery is closed, forming a charging and discharging circuit between the energy storage inverter and the battery management system (BMS). By forming a charging and discharging loop between the energy storage inverter and the battery management system (BMS), the reference voltage that is forcibly output from the energy storage inverter to the battery management system (BMS) is received. Based on the reference voltage output by the energy storage inverter to the battery management system (BMS), the BMS is restarted by power-on.

3. The method according to claim 1, characterized in that, The detection process includes determining whether the battery modules in the energy storage battery are in a reference depleted state during the current detection phase, including: The battery management system (BMS) in the energy storage battery detects the current voltage of the battery module included in the energy storage battery during the current detection phase. The current voltage is used to indicate the potential difference between the two ends of the battery module used to connect the positive and negative terminals of the energy storage inverter during the current detection phase. If the current voltage is less than the reference voltage, it is determined that the battery module in the energy storage battery is in a reference depleted state during the current detection stage. The reference voltage is the lower limit voltage that is forcibly output from the energy storage inverter to the battery management system (BMS) to support the BMS in entering the reference operating state. If the current voltage is not less than the reference voltage, it is determined that the battery module in the energy storage battery is not in the reference depleted state during the current detection stage.

4. The method according to claim 1, characterized in that, The target test results are obtained by testing the battery performance of the battery module in the energy storage battery, including: Determine the current pressure of the battery module in the energy storage battery during the current detection stage. The current pressure is the pressure of the battery module end plate collected by the pressure sensor during the current detection stage. If the difference between the current pressure and the reference pressure is not less than the preset pressure difference, it is determined that the battery module in the energy storage battery is not only in a reference depleted state in the current detection stage, but has also experienced the first type of battery damage. The reference pressure is the pressure of the battery module end plate collected by the pressure sensor in the reference detection stage. The reference detection stage is the process of charging the battery module when it is not in a reference depleted state. The first type of battery damage is battery structural damage caused by changes in the physical state of the electrolyte in the battery. If the difference between the current pressure and the reference pressure is less than the preset pressure difference, it is determined that the battery module in the energy storage battery is in a reference depleted state at the current detection stage, but no first type of battery damage has occurred.

5. The method according to claim 4, characterized in that, After determining that the battery module in the energy storage battery is in a reference depleted state but has not experienced type 1 battery damage at the current detection stage, the process further includes: The control opens and closes the charge / discharge switch in the energy storage battery and opens the backup switch in the energy storage battery, forming a charge / discharge circuit between the energy storage inverter battery modules and disconnecting the charge / discharge circuit between the energy storage inverter and the battery management system (BMS). The battery module in the energy storage battery is charged with a preset current by the energy storage inverter, and the replenished cell voltage of each cell in the battery module is detected. The replenished cell voltage is the potential difference between the positive and negative terminals of the cell in the battery module after a preset charging time in the current detection stage. If at least one cell in the battery module has a replenished cell voltage that is lower than the cell over-discharge protection voltage of the battery module, then it is determined that the battery module in the energy storage battery is not only in a reference depleted state at the current detection stage, but has also experienced a second type of battery damage. The second type of battery damage is the damage caused by the degradation of battery charge and discharge performance due to the decay of the activity of internal battery materials. If the replenished cell voltage of all cells in the battery module is not less than the cell over-discharge protection voltage of the battery module, then it is determined that although the battery module in the energy storage battery is in a reference depleted state at the current detection stage, no second type of battery damage has occurred.

6. The method according to claim 5, characterized in that, After determining that the battery module in the energy storage battery is in a reference depleted state but has not shown any type II battery damage at the current detection stage, the process further includes: The current charging characteristic data of the battery module in the energy storage battery during the current testing stage is detected. The charging characteristic data is the change of voltage and temperature of the battery cell in the battery module with current during the charging process. Determine reference charging characteristic data of the battery module in the energy storage battery during the reference detection phase of the charging process, wherein the reference detection phase is the process of charging the battery module when the battery module is not in a reference depleted state; If the feature difference between the current charging feature data and the reference charging feature data is not less than the preset feature difference, then it is determined that the battery module in the energy storage battery is not only in the reference depleted state in the current detection stage, but also has a third type of battery damage. The third type of battery damage is caused by a significant change in the electrochemical state inside the battery, which leads to abnormal voltage and temperature changes in the battery. If the feature difference between the current charging feature data and the reference charging feature data is less than the preset feature difference, it is determined that the battery module in the energy storage battery is in a reference depleted state at the current detection stage, but no third type of battery damage has occurred.

7. The method according to claim 6, characterized in that, After determining that the battery module in the energy storage battery is in a reference depleted state but has not shown any type III battery damage at the current detection stage, the process further includes: The current full charge capacity of the battery module in the energy storage battery when it is fully charged during the current testing phase is detected, and the reference full charge capacity of the battery module in the energy storage battery when it is fully charged during the reference testing phase is determined. If the current full charge capacity is less than a preset percentage of the reference full charge capacity, it is determined that the battery module in the energy storage battery is not only in a reference depleted state at the current detection stage, but has also experienced a fourth type of battery damage. The fourth type of battery damage is caused by problems with the efficiency and stability of the chemical reaction occurring inside the battery module, which leads to a reduction in the energy storage performance of the battery module. If the current full charge capacity is not less than the preset percentage of the reference full charge capacity, it is determined that although the battery module in the energy storage battery is in a reference low charge state at the current detection stage, the battery module has not been damaged.

8. A testing device for an energy storage battery, wherein the energy storage battery includes a battery module and a battery management system (BMS), characterized in that, The device includes: The power-on startup module is used to output voltage to the battery management system (BMS) to restart the BMS. The low-power detection module is used to detect whether the battery module in the energy storage battery is in a reference low-power state during the current detection stage after the battery management system (BMS) is restarted. The reference low-power state is the state in which the battery module's power is consumed to a level lower than a preset battery power threshold after excessive discharge. The performance detection module is used to detect the battery performance of the battery module in the energy storage battery if the battery module in the energy storage battery is in a reference depleted state during the current detection stage, and obtain the target detection result. The target detection result is used to indicate whether the battery module has been damaged and the battery damage location result when the battery module has been damaged.

9. An electronic device, characterized in that, The electronic device includes: At least one processor; and A memory communicatively connected to the at least one processor; wherein, The memory stores a computer program that can be executed by the at least one processor, the computer program being executed by the at least one processor to enable the at least one processor to perform the energy storage battery detection method according to any one of claims 1-7.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer instructions that, when executed by a processor, implement the energy storage battery detection method according to any one of claims 1-7.

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