Method, device and equipment for determining battery internal short circuit fault of energy storage power station and medium

Abstract

The application provides a battery internal short circuit fault determination method, device, equipment and medium of an energy storage power station. The method comprises the following steps: in response to determining that a plurality of battery monomers in the energy storage power station are in a charging state, acquiring a charging time length required for real-time charging voltages of the plurality of battery monomers to reach a charging cutoff voltage; obtaining a charging difference time length of each of the plurality of charging time lengths and a first target time length in each battery cluster according to the charging time length of each of the plurality of battery monomers in each battery cluster and the first target time length in each battery cluster; in response to determining that a maximum charging difference time length in the plurality of charging difference time lengths is greater than a predetermined difference threshold, determining that a battery monomer corresponding to the maximum charging difference time length is a battery monomer to be verified; in response to determining that the plurality of battery monomers in the energy storage power station are in a stationary state, and there is a continuous circulating current between a target battery cluster in which the battery monomer to be verified is located and the remaining battery clusters in the energy storage power station, it is determined that there is an internal short circuit fault in the battery monomer to be verified.

Description

Technical Field

[0001] This application relates to the field of safe operation and maintenance technology of energy storage power stations, and more specifically, to a method, apparatus, equipment and medium for determining internal short circuit faults in batteries of an energy storage power station. Background Technology

[0002] Lithium-ion battery electrochemical energy storage power stations offer technological advantages such as rapid response, high energy density, and long cycle life. However, during long-term operation, the performance degradation and potential faults of individual battery cells gradually become apparent, easily triggering internal short-circuit faults. Internal short-circuit faults in individual battery cells occur when damage to the internal structure creates abnormal conduction paths, posing an extremely high risk of thermal runaway. Failure to promptly isolate and replace battery cells with internal short-circuit faults can easily lead to heat propagation, cascading failures, and even fires.

[0003] However, related technologies rely solely on single voltage, current, and temperature thresholds for fault diagnosis, resulting in low accuracy of the findings. Summary of the Invention

[0004] In view of this, this application provides a method, apparatus, equipment and medium for determining short-circuit faults within batteries of an energy storage power station.

[0005] This application provides a method for determining internal short-circuit faults in batteries of an energy storage power station. The energy storage power station is configured with multiple battery clusters connected in parallel, and each battery cluster is configured with multiple battery cells connected in series. The method includes: in response to determining that multiple battery cells in the energy storage power station are in a charging state, acquiring the charging time required for each of the multiple battery cells to reach its real-time charging voltage to the charging cutoff voltage; obtaining charging difference durations between the multiple charging times in each battery cluster and the first target duration based on the charging times of the multiple battery cells in each battery cluster and a first target duration in each battery cluster; wherein the first target duration represents the time required for the real-time voltage of the target battery cell in each battery cluster that completes charging operation fastest to reach the charging cutoff voltage; in response to determining that the maximum charging difference duration among the multiple charging difference durations is greater than a predetermined difference threshold, determining the battery cell corresponding to the maximum charging difference duration as the battery cell to be checked; and in response to determining that multiple battery cells in the energy storage power station are in a static state, and that there is a continuous circulating current between the target battery cluster containing the battery cell to be checked and the other battery clusters in the energy storage power station, determining that an internal short-circuit fault exists in the battery cell to be checked.

[0006] According to an embodiment of this application, the method of determining an internal short-circuit fault in the battery cell to be tested in response to determining that multiple battery cells in the energy storage power station are in a static state and that there is a continuous circulating current between the target battery cluster containing the battery cell to be tested and the other battery clusters in the energy storage power station includes: in response to determining that multiple battery cells in the energy storage power station are in a static state, acquiring the port current between the target battery cluster and any other battery cluster in the multiple battery clusters within a predetermined time period; wherein the predetermined time period includes multiple testing moments within the alternating period of charging and discharging operations performed on the multiple battery cells; determining, from the multiple testing moments, a moment when the port current between the target battery cluster and any other battery cluster in the multiple battery clusters is greater than a predetermined current threshold as a first target moment; counting the number of the first target moments; and in response to determining that a first ratio between the number of the first target moments and the multiple testing moments is greater than a predetermined ratio threshold, determining that an internal short-circuit fault exists in the battery cell to be tested.

[0007] According to an embodiment of this application, the method further includes: in response to determining that a plurality of battery cells in the energy storage power station are in a static state, and that the real-time static voltage of the battery cell to be tested in the static state is less than that of the other battery cells in the target battery cluster, determining that there is an internal short circuit fault in the battery cell to be tested.

[0008] According to an embodiment of this application, the above-mentioned response to determining that multiple battery cells in the energy storage power station are in a static state, and that the real-time static voltage of the battery cell to be tested in the static state is less than that of the other battery cells in the target battery cluster, and determining that there is an internal short circuit fault in the battery cell to be tested, includes: in response to determining that multiple battery cells in the energy storage power station are in a static state, acquiring the real-time static voltage of multiple battery cells in the target battery cluster; wherein, the predetermined time period includes multiple test times between the time when the multiple battery cells complete charging and the time when the discharge operation is performed; from the multiple test times, determining the time when the real-time static voltage of the battery cell to be tested is less than that of the other battery cells in the target battery cluster as a second target time; counting the number of the second target times; and in response to determining that a second ratio between the number of the second target times and the multiple test times is greater than a predetermined ratio threshold, determining that there is an internal short circuit fault in the battery cell to be tested.

[0009] According to an embodiment of this application, the method further includes: in response to determining that multiple battery cells in the energy storage power station are in a static state, and that there is a continuous circulating current between the target battery cluster where the battery cell to be tested is located and the other battery clusters in the energy storage power station, and that the real-time static voltage of the battery cell to be tested in the static state is less than that of the other battery cells in the target battery cluster, determining that there is an internal short circuit fault in the battery cell to be tested, and determining that there is an internal short circuit fault in the battery cell to be tested.

[0010] According to an embodiment of this application, the above-mentioned response to determining that multiple battery cells in the energy storage power station are in a static state, and that there is a continuous circulating current between the target battery cluster containing the battery cell to be tested and the other battery clusters in the energy storage power station, and that the real-time static voltage of the battery cell to be tested in the static state is less than that of the other battery cells in the target battery cluster, and determining that there is an internal short circuit fault in the battery cell to be tested, includes: in response to determining that multiple battery cells in the energy storage power station are in a static state, acquiring the port current between the target battery cluster and any other battery cluster in the multiple battery clusters within a predetermined time period, and the multiple short circuit faults within the target battery cluster. The real-time static voltage of a single battery cell; wherein the predetermined time period includes multiple verification times within the alternating period of charging and discharging operations performed on the multiple battery cells; from the multiple verification times, the time when the port current between the target battery cluster and any other battery cluster in the multiple battery clusters is greater than a predetermined current threshold, and the real-time static voltage of the battery cell to be verified is less than the real-time static voltage of the other battery cells in the target battery cluster is determined as the third target time; the number of the third target times is counted; and in response to determining that the third ratio between the number of the third target times and the multiple verification times is greater than a predetermined ratio threshold, it is determined that there is an internal short circuit fault in the battery cell to be verified.

[0011] According to an embodiment of this application, the method further includes: in response to determining that multiple battery cells in the energy storage power station are in a discharge state, obtaining the discharge time required for each of the multiple battery cells to reach the discharge cutoff voltage; and determining the battery cell with the shortest discharge time from the multiple battery cells as the battery cell to be verified.

[0012] This application provides another embodiment of a battery short-circuit fault determination device for an energy storage power station. The energy storage power station is configured with multiple battery clusters connected in parallel, and each battery cluster is configured with multiple battery cells connected in series. The device includes: an acquisition module, configured to acquire, in response to determining that multiple battery cells in the energy storage power station are in a charging state, the charging time required for each of the multiple battery cells to reach its real-time charging cutoff voltage; and a difference module, configured to obtain the charging difference time between the charging time of each battery cell in each battery cluster and the first target time in each battery cluster, based on the charging time of each of the multiple battery cells in each battery cluster and the first target time in each battery cluster. In this context, the first target duration represents the time required for the real-time voltage of the target battery cell that completes the charging operation fastest in each battery cluster to reach the charging cutoff voltage; the first determining module is configured to determine, in response to determining that the maximum charging difference duration among the plurality of the aforementioned charging difference durations is greater than a predetermined difference threshold, that the battery cell corresponding to the maximum charging difference duration is the battery cell to be verified; and the second determining module is configured to determine, in response to determining that a plurality of battery cells in the aforementioned energy storage power station are in a static state, and that there is a continuous circulating current between the target battery cluster where the battery cell to be verified is located and the other battery clusters in the aforementioned energy storage power station, that there is an internal short-circuit fault in the aforementioned battery cell to be verified.

[0013] In another aspect, this application provides an electronic device, including: one or more processors; and a memory for storing one or more programs, wherein when the one or more programs are executed by the one or more processors, the one or more processors implement any of the methods described above.

[0014] In another aspect, embodiments of this application provide a computer-readable storage medium having executable instructions stored thereon, which, when executed by a processor, cause the processor to implement any of the methods described above.

[0015] According to embodiments of this application, a method for determining internal short-circuit faults in batteries of an energy storage power station is proposed. First, during the charging phase, suspected internal short-circuit fault cells are preliminarily screened by comparing the differences in the time taken for each cell within the same battery cluster to reach the charging cutoff voltage. Then, during the resting phase, the presence of a continuous circulating current between the battery cluster containing the suspected internal short-circuit fault cell and other parallel battery clusters is detected, ultimately confirming the existence of an internal short-circuit fault in the cell to be tested. Only comparing charging time and determining the presence of circulating current is required to determine the existence of an internal short-circuit fault, eliminating the need for complex modeling. By using both charging triggering and resting confirmation stages for short-circuit detection, the risk of misjudgment based on a single state is reduced. Attached Figure Description

[0016] The above and other objects, features and advantages of this application will become clearer from the following description of embodiments of this application with reference to the accompanying drawings, which will be explained in conjunction with the drawings.

[0017] Figure 1 An exemplary system architecture for a battery-based short-circuit fault determination method for an energy storage power station according to an embodiment of this application is shown.

[0018] Figure 2 A flowchart is shown for a method for determining an internal short-circuit fault in a battery of an energy storage power station according to an embodiment of this application.

[0019] Figure 3 A flowchart is shown illustrating a process, according to an embodiment of this application, to determine whether a single battery cell under test has an internal short-circuit fault based on the presence or absence of a continuous circulating current during a resting phase.

[0020] Figure 4 A flowchart is shown illustrating the process of determining the presence of an internal short-circuit fault in a battery cell under test based on the real-time static voltage during the static stage, according to an embodiment of this application.

[0021] Figure 5 A flowchart is shown illustrating a process according to an embodiment of this application for determining whether a single battery cell under test has an internal short-circuit fault based on the presence of a continuous circulating current and the real-time static voltage during the resting phase.

[0022] Figure 6 A flowchart illustrating the determination of a battery cell to be tested during the discharge phase according to yet another embodiment of this application is shown.

[0023] Figure 7 A block diagram of a battery short-circuit fault determination device for an energy storage power station according to an embodiment of this application is shown.

[0024] Figure 8 A block diagram of an electronic device suitable for determining internal short-circuit faults in a battery in an energy storage power station, according to an embodiment of this application, is shown. Detailed Implementation

[0025] The embodiments of this application will now be described with reference to the accompanying drawings. However, it should be understood that these descriptions are exemplary only and are not intended to limit the scope of this application. In the following detailed description, numerous specific details are set forth to provide a thorough understanding of the embodiments of this application for ease of explanation. However, it will be apparent that one or more embodiments may be implemented without these specific details. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concepts of this application.

[0026] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of this application. The terms “comprising,” “including,” etc., as used herein indicate the presence of the stated features, steps, operations, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, or components.

[0027] All terms used herein (including technical and scientific terms) have the meanings commonly understood by those skilled in the art, unless otherwise defined. It should be noted that the terms used herein should be interpreted in a manner consistent with the context of this specification, and not in an idealized or overly rigid way.

[0028] When using expressions such as "at least one of A, B, and C," it should generally be interpreted according to the meaning commonly understood by those skilled in the art (e.g., "a system having at least one of A, B, and C" should include, but is not limited to, systems having only A, only B, only C, A and B, A and C, B and C, and / or systems having A, B, and C, etc.). In related technologies, battery management systems are commonly used as battery fault identification devices on the DC side of energy storage power stations. However, this approach has limitations: firstly, the battery management system can only determine faults based on single voltage, current, and temperature thresholds, and cannot effectively identify the fault type; secondly, the thresholds of the battery management system only ensure that the lithium-ion battery operates within the normal voltage, circuit, and temperature range, while some faults occur even when the battery's voltage, current, and temperature are within the normal range, making it impossible for the battery management system to reliably identify the fault.

[0029] This application provides a method, apparatus, device, and medium for determining internal short-circuit faults in batteries of an energy storage power station. First, during the charging phase, suspected internal short-circuit fault cells are preliminarily screened by comparing the differences in the time taken for each cell within the same battery cluster to reach the charging cutoff voltage. Then, during the resting phase, the presence of a continuous circulating current between the suspected cell's battery cluster and other parallel battery clusters is detected to ultimately determine if an internal short-circuit fault exists within the cell to be tested. Only comparing charging time and determining the presence of circulating current is required to determine the existence of an internal short-circuit fault, eliminating the need for complex modeling. By using both charging triggering and resting confirmation stages for short-circuit detection, the risk of misjudgment based on a single state is reduced.

[0030] Figure 1 This paper illustrates an exemplary system architecture for a battery-based short-circuit fault determination method, apparatus, device, and medium, according to embodiments of this application, which can be used in an energy storage power station. It should be noted that... Figure 1The examples shown are merely examples of system architectures that can be applied to the embodiments of this application, in order to help those skilled in the art understand the technical content of this application, but do not mean that the embodiments of this application cannot be used in other devices, systems, environments or scenarios.

[0031] like Figure 1 As shown, the system architecture according to this embodiment may include an energy storage power station 110, a first terminal device 120, and a server 130.

[0032] The energy storage power station 110 includes an energy storage converter system 111 and a battery cluster topology 112. The energy storage converter system 111 is responsible for bidirectional conversion between direct current (DC) and alternating current (AC). Each battery cluster in the battery cluster topology 112 consists of N battery cells connected in series, where I is an integer greater than 1. Multiple battery clusters (cell cluster 1, 2, 3…cell cluster j) are connected in parallel and connected to the DC side of the converter system. Circuit 112a is included to handle internal short-circuit faults in individual battery cells. When an internal short-circuit fault occurs, the open-circuit voltage source U… ocv * An internal short-circuit resistor R will be connected in parallel with the ohmic internal resistance R0. ISC R ISC It will continuously divert and consume electrical energy. Circuit 112b when the battery cell is in normal condition.

[0033] Users can interact with server 130 using first terminal device 120 to receive or send messages, etc.

[0034] The first terminal device 120 can be any electronic device with a display screen and web browsing capability, including but not limited to smartphones, tablets, laptops, and desktop computers.

[0035] Server 130 can be a server that provides various services, such as a backend management server that supports websites browsed by users using the first terminal device 120 (for example only). The backend management server can analyze and process data such as received user requests, and feed back the processing results (such as web pages, information, or data obtained or generated according to user requests) to the first terminal device.

[0036] It should be noted that the method for determining internal short-circuit faults in the battery of the energy storage power station provided in this application embodiment can generally be executed by the server 130. Correspondingly, the device for determining internal short-circuit faults in the battery of the energy storage power station provided in this application embodiment can generally be located in the server 130. The method for determining internal short-circuit faults in the battery of the energy storage power station provided in this application embodiment can also be executed by a server or server cluster that is different from the server 130 and capable of communicating with the first terminal device 120 and / or the server 130. Correspondingly, the device for determining internal short-circuit faults in the battery of the energy storage power station provided in this application embodiment can also be located in a server or server cluster that is different from the server 130 and capable of communicating with the first terminal device 120 and / or the server 130.

[0037] It should be understood that Figure 1 The number of terminal devices 120 and servers 130 shown is merely illustrative. Depending on implementation needs, any number of terminal devices and servers can be used.

[0038] Figure 2 A flowchart of a method for determining internal short-circuit faults in a battery of an energy storage power station according to an embodiment of this application is shown.

[0039] like Figure 2 As shown, the method includes operations S210 to S280.

[0040] In operation S210, in response to determining that multiple battery cells in the energy storage power station are in a charging state, the charging time required for each of the multiple battery cells to reach the charging cutoff voltage in real time is obtained.

[0041] State of charge (SOC) refers to the process by which the Battery Management System (BMS) controls an external power source to charge individual battery cells, causing the cell voltage to rise from its current value to the charging cutoff voltage. The charging cutoff voltage is a preset upper limit voltage value that a battery cell can reach during charging. When the cell voltage reaches this value, the charging process automatically stops to prevent overcharging. Charging time refers to the time elapsed from the start of charging until the cell first reaches the charging cutoff voltage.

[0042] In operation S220, based on the charging time of each individual battery cell in each battery cluster and the first target time in each battery cluster, the charging difference time between the multiple charging times and the first target time in each battery cluster is obtained.

[0043] The charging time of the i-th individual cell in each battery cluster can be represented as t. iThe first target duration in each battery cluster represents the time required for the real-time voltage of the target battery cell that completes the charging operation fastest in each cluster to reach the charging cutoff voltage, which can be expressed as t. min Charging difference time represents the difference between the time it takes for a specific battery cell to reach its charging cutoff voltage and the time it takes for the first battery cell to reach its charging cutoff voltage within the same battery cluster. It can be expressed as: .

[0044] In operation S230, determine whether the maximum charging difference duration among multiple charging difference durations is greater than a predetermined difference threshold. If yes, proceed to S250; otherwise, proceed to S240.

[0045] The predetermined difference threshold refers to the upper limit of the pre-set charging difference duration, which can be expressed as: This threshold can be calibrated based on the battery cell model, aging level, etc., for example, 1 second, 2 seconds, 3 seconds.

[0046] During operation S240, it was determined that there was no internal short circuit fault within multiple battery cells.

[0047] In operation S250, the battery cell corresponding to the maximum charging difference time is identified as the battery cell to be verified.

[0048] Although a battery cluster may contain multiple battery cells to be tested simultaneously, the degree of internal short circuit varies among these cells. Therefore, the charging difference time of each battery cell increases with the degree of internal short circuit. In this embodiment, the battery cell with the maximum charging difference time exceeding a predetermined difference threshold is selected as the battery cell to be tested. For example, if the charging difference time of the i-th battery cell is 3 seconds and the charging difference time of the (i-1)-th battery cell is 2 seconds, then the charging difference time of the i-th battery cell is compared with the predetermined difference threshold of "2 seconds." It is determined that the charging difference time of the i-th battery cell exceeds the predetermined difference threshold; therefore, the i-th battery cell is selected as the battery cell to be tested.

[0049] In operation S260, determine whether there is a continuous circulating current between the target battery cluster containing the battery cell to be verified and the other battery clusters in the energy storage power station, given that multiple battery cells in the energy storage power station are in a static state. If yes, proceed to S280; otherwise, proceed to S270.

[0050] The quiescent state refers to a stable state in which a battery cell is neither charged nor discharged after charging stops, remaining open-circuited and without external current input. Continuous circulating current refers to a non-zero current that exists for an extended period between a battery cluster and other battery clusters in the quiescent state after charging stops. This current flows continuously without changing direction, indicating that the voltage of that battery cluster remains consistently low due to an internal short-circuit fault, thus being continuously charged by other clusters.

[0051] During operation S270, it was confirmed that there was no internal short circuit fault in the battery cell to be tested.

[0052] During operation S280, it was determined that an internal short circuit fault existed in the battery cell to be tested.

[0053] During the charging phase, when a normal battery cell is fully charged and reaches its upper limit cutoff voltage, the voltage of a battery cell with an internal short-circuit fault is lower than the upper limit cutoff voltage due to additional energy loss. In energy storage power stations, to ensure consistent state of charge among battery cells, once a single battery cell is fully charged and reaches its upper limit cutoff voltage, the BMS (Battery Management System) activates an energy balancing strategy. This maintains the voltage of normal battery cells while continuing to supply current to those with lower voltages until all battery cells reach their upper limit cutoff voltage. Therefore, the charging time for a battery cell with an internal short-circuit fault is longer than that for other normal battery cells.

[0054] The BMS collects data such as the voltage of each battery cell and the port current of each battery cluster in real time, and records the time it takes for a battery cell to reach the charging cutoff voltage for the first time when it is fully charged.

[0055] For the same battery cluster, find the shortest charging time among all the individual cells in that cluster, i.e., the time it takes to reach the charging cutoff voltage the fastest. Comparisons are only performed within the same cluster because the individual cells are connected in series and flow with the same current; therefore, differences in charging time best reflect differences in individual cell performance.

[0056] Then, the difference between the charging time of each individual cell in the battery cluster and the time required for the fastest charging cutoff voltage in the battery cluster is calculated, and the charging difference time is obtained based on equation (1).

[0057] (1);

[0058] in, This represents the charging time difference of the i-th battery cell within the battery cluster. This represents the charging time of the i-th battery cell within the battery cluster. This indicates the time required for the battery cluster to reach the charging cutoff voltage as quickly as possible.

[0059] When inequality (2) is satisfied, the fault identification process is triggered, and the battery cell is marked as a battery cell to be checked.

[0060] (2);

[0061] in, This represents a pre-set threshold for difference.

[0062] This step only triggers the identification process and does not directly determine an internal short circuit fault. Because differences in charging time may also be caused by other factors, such as battery cell capacity decay or inconsistent internal resistance, further verification is required in the next stage.

[0063] Once the energy storage power station stops charging and enters a static state, monitoring continues on the target battery cluster (i.e., the cluster containing the individual battery cells to be tested). Specifically, the monitoring focuses on the circulating current (i.e., the inter-cluster current difference) between the target battery cluster and any other battery cluster.

[0064] During the resting phase, due to the balancing effect, when there is no internal short-circuit fault in the individual cells within the target battery cluster, the voltage of the individual cells in the battery clusters is the same, and there is no circulating current between the battery clusters. That is, after charging stops, the current difference between the battery clusters is 0. When there is an internal short-circuit fault in the individual cells within the target battery cluster, the cell with the internal short-circuit fault will continuously consume internal energy, the voltage of the target battery cluster will be lower than the voltage of the other battery clusters, and there will be a continuous circulating current.

[0065] If a continuous circulating current exists within the battery cluster containing the battery cell to be tested, then an internal short-circuit fault is determined to exist within the battery cell to be tested corresponding to the maximum charging difference duration. If no continuous circulating current exists within the battery cluster containing the battery cell to be tested, then an internal short-circuit fault is determined to exist within the battery cell to be tested corresponding to the maximum charging difference duration.

[0066] For example, if there is a circulating current between the target battery cluster containing the i-th battery cell and any other battery cluster, it can be determined that there is an internal short circuit fault in the i-th battery cell.

[0067] First, during the charging phase, the time taken for individual cells within the same battery cluster to reach the charging cutoff voltage is compared to initially screen for suspected internal short-circuit faults. Then, during the resting phase, the presence of a continuous circulating current between the battery cluster containing the suspected internal short-circuit faulty cell and other parallel battery clusters is detected to ultimately confirm the existence of an internal short-circuit fault within the battery cell under test. This method only requires comparing charging time and determining the presence of circulating current to determine the existence of an internal short-circuit fault, eliminating the need for complex modeling. By using both charging triggering and resting confirmation stages for short-circuit detection, the risk of misjudgment based on a single state is avoided.

[0068] Figure 3 The diagram illustrates a flowchart of determining the presence of an internal short-circuit fault in a battery cell under test based on the presence of a continuous circulating current during a resting phase, according to an embodiment of this application.

[0069] like Figure 3 As shown, during the resting phase, determining whether the battery cell to be tested has an internal short circuit fault based on the presence or absence of a continuous circulating current includes operations S310 to S360.

[0070] In operation S310, in response to determining that multiple battery cells in the energy storage power station are in a static state, the port current between the target battery cluster and any other battery cluster in the multiple battery clusters is acquired within a predetermined time period, wherein the predetermined time period includes multiple verification moments within the alternating period of charging and discharging operations performed on the multiple battery cells.

[0071] Port current refers to the external current measured from the positive and negative terminals of a single battery cell or battery cluster. It is positive during charging and negative during discharging. In the resting state, this current reflects the exchange current with external circuits, such as equalization circuits or other parallel clusters, and can be denoted as I. circ (t). The scheduled time period can be denoted as [t]. stop ,t stop +Δt obs ], where t stop Δt is the moment when charging stops. obs The observation window length, such as 30 seconds or 60 seconds, is selected based on the characteristics of the individual battery cells and engineering conditions between the time of charging completion and the time of discharge operation initiation. Multiple verification times can be selected within this predetermined time period. The system selects multiple discrete verification times as needed, which are integers greater than 1, such as 100, 500, and 1000. The number of multiple verification times can be denoted as N1.

[0072] In operation S320, from multiple times to be verified, the time when the port current between the target battery cluster and any other battery cluster in the multiple battery clusters is greater than a predetermined current threshold is determined as the first target time.

[0073] The predetermined current threshold can be set slightly higher than the normal current fluctuation range, for example, considering measurement noise and balancing the current amplitude, set to 0.1A, 0.2A, 0.3A. This can be denoted as I. th .

[0074] When operating S330, count the number of times the first target moment occurs.

[0075] The number of time points at the first objective can be denoted as M1.

[0076] In operation S340, determine whether the first ratio between the number of first target times and the multiple times to be verified is greater than a predetermined ratio threshold. If yes, proceed to S360; otherwise, proceed to S350.

[0077] The first ratio represents the ratio of the number of first target moments to the number of multiple moments to be verified, which can be denoted as R1.

[0078] The predetermined percentage threshold is a pre-set percentage value that can be selected based on engineering experience; for example, it can be 90%, 91%, or 92%. It can be denoted as R. th1 .

[0079] During the S350 operation, it was confirmed that there was no internal short circuit fault in the battery cell to be tested.

[0080] During the operation of S360, it was determined that there was an internal short circuit fault in the battery cell to be tested.

[0081] For the target battery cluster containing the battery cell to be verified, the port current between the target battery cluster and any other battery cluster is monitored in real time. At each verification time, it is determined whether the port current at that time is greater than a predetermined current threshold, so that only significant and continuous circulating current can be counted. If an inequality (3) is satisfied at a certain time, then that time is recorded as the first target time and counted.

[0082] (3);

[0083] in, This represents the port current between the target battery cluster and any other battery cluster. Indicates the predetermined current threshold, t stop Δt is the moment when charging stops. obs This represents the length of the observation window.

[0084] After traversing all the time moments to be verified within the predetermined time period, the total number of the first target time moments is counted, and the first proportion is calculated according to formula (4).

[0085] (4);

[0086] Where R1 represents the first ratio, M1 represents the total number of the first target time moments, and N1 represents the number of time moments to be verified.

[0087] The first ratio R1 is compared with the predetermined ratio threshold R th1 Line comparison.

[0088] When R1>R th1 This indicates that for most of the time within the observation window, the port current between the target battery cluster and other battery clusters exceeded the noise level, meaning that there was a continuous circulating current between the target battery cluster and other battery clusters. This confirms that the battery cell under test corresponding to the maximum charging difference duration has an internal short circuit fault.

[0089] When R1≤R th1 This indicates that there is no continuous circulating current between the target battery cluster and other battery clusters, confirming that the battery cell under test does not have an internal short-circuit fault. In this case, even if a large current occasionally appears, it may be a transient disturbance or a brief balancing behavior, which is insufficient to confirm an internal short-circuit fault.

[0090] By acquiring port current data at multiple verification times within a predetermined time period, the number of times the port current exceeds a predetermined current threshold is counted, and the first proportion of this number to the total verification times is calculated. Only when this first proportion exceeds a predetermined proportion threshold is it determined that "continuous circulating current exists." This avoids misjudging continuous circulating current due to instantaneous current fluctuations or brief measurement errors, improving the robustness and anti-interference capability of fault determination results. The adjustable proportion threshold allows this method to adapt to different noise levels and equalization strategies of energy storage power stations, exhibiting good engineering adaptability. Furthermore, this judgment logic requires only simple comparison, counting, and proportion calculations, resulting in low computational burden and easy real-time implementation in battery management systems.

[0091] According to an embodiment of this application, the method for determining an internal short-circuit fault in a battery in an energy storage power station further includes: in response to determining that multiple battery cells in the energy storage power station are in a static state, and that the real-time static voltage of the battery cell to be tested in the static state is less than that of the other battery cells in the target battery cluster, determining that an internal short-circuit fault exists in the battery cell to be tested.

[0092] Real-time static voltage refers to the instantaneous value of the terminal voltage of a battery cell when the battery cell is in a static state at a specific moment.

[0093] For example, if a target battery cluster contains 3 battery cells, and the real-time static voltage of the battery cell to be tested is 0.1V, the real-time static voltage of battery cell 2 is 1V, and the real-time static voltage of battery cell 3 is 1V, then it is determined that there is an internal short circuit fault in the battery cell to be tested.

[0094] A target battery cluster contains 3 battery cells. The real-time static voltage of the battery cell to be tested is 0.1V, the real-time static voltage of battery cell 2 is 1V, and the real-time static voltage of battery cell 3 is 0.01V. Therefore, it is determined that there is no internal short circuit fault in battery cell 1 to be tested.

[0095] Because a battery cell with an internal short circuit fault continuously consumes energy, its state of charge and terminal voltage are lower than those of a normal battery cell when at rest. Therefore, by comparing the real-time resting voltage of the battery cell under test with that of other battery cells in the same battery cluster, if the voltage of the battery cell under test remains lower than that of other battery cells in the same battery cluster during the resting period, it is determined that the battery cell under test has an internal short circuit fault.

[0096] This method of determination can determine whether there is an internal short circuit fault in the individual battery cell under test by comparing the voltages within the battery cluster.

[0097] Figure 4 The diagram illustrates a flowchart of determining the presence of an internal short-circuit fault in a battery cell under test based on the real-time static voltage during the static stage, according to an embodiment of this application.

[0098] like Figure 4 As shown, during the resting phase, determining the presence of an internal short circuit fault in the battery cell to be tested based on the real-time voltage includes operations S410 to S460.

[0099] In operation S410, in response to determining that multiple battery cells in the energy storage power station are in a static state, the real-time static voltage of multiple battery cells in the target battery cluster is obtained within a predetermined time period, wherein the predetermined time period includes multiple verification times within the alternating period of charging and discharging operations performed on multiple battery cells.

[0100] The scheduled time period can be denoted as [t] stop ,t stop +Δt obs The number of multiple times to be verified can be denoted as N2.

[0101] In operation S420, from multiple times to be verified, the time when the real-time static voltage of the battery cell to be verified is less than the real-time static voltage of the other battery cells in the target battery cluster is determined as the second target time.

[0102] The real-time static voltage of the battery cell to be tested can be denoted as V. i (t), the real-time resting voltage of the remaining battery cells in the target cluster can be denoted as V. others (t).

[0103] When operating S430, count the number of times the second target is reached.

[0104] The number of time points for the second objective can be denoted as M2.

[0105] In operation S440, it is determined whether a second ratio between the number of the second target time points and the multiple time points to be verified is greater than a predetermined ratio threshold. If yes, proceed to S460; otherwise, proceed to S450. The second ratio can be denoted as R2. The predetermined ratio threshold can be denoted as R. th2 .

[0106] During the S450 operation, it was confirmed that there was no internal short circuit fault in the battery cell to be tested.

[0107] During the operation of S460, it was determined that an internal short circuit fault existed in the battery cell to be tested.

[0108] The scheduled time period is [t] stop ,t stop +Δt obs The time to be verified is N2, the second ratio is R2, and the predetermined ratio threshold is R. th2 The selection and calculation methods of the above parameters are as described in the embodiments of operations S310 to S360, and will not be repeated here.

[0109] For the target battery cluster containing the battery cell to be verified, the real-time static voltage of the battery cell to be verified is monitored in real time, and compared with the real-time static voltage of all other battery cells in the same battery cluster. At each verification time, it is determined whether the static voltage at that time is less than the static voltage of all other battery cells in the same battery cluster. If the inequality (5) is satisfied at a certain time, then that time is recorded as the second target time and counted.

[0110] (5);

[0111] Among them, V i (t) represents the real-time static voltage of the battery cell being tested. t represents the real-time resting voltage of the remaining individual cells within the same battery cluster. stop Δt is the moment when charging stops. obs This represents the length of the observation window.

[0112] When a battery cell with an internal short circuit fault is at rest, its voltage will consistently be lower than that of other normal battery cells in the same battery cluster. However, in actual engineering, the voltage measurement of a battery cell may be affected by factors such as sampling noise, communication interruptions, and analog-to-digital conversion accuracy, resulting in occasional voltage jumps or abnormal values. Therefore, a time percentage determination method is introduced.

[0113] If R2>R th2 If the static voltage of the cell to be tested is consistently lower than that of other cells in the same cluster within the observation window, it indicates that there is an internal short circuit fault in the cell to be tested.

[0114] If R2≤R th2 If the voltage of the battery cell to be tested is low, it is considered that the low voltage is not continuous and may be a random phenomenon caused by a brief measurement fluctuation or equalization process. It is determined that there is no internal short circuit fault in the battery cell to be tested.

[0115] By acquiring the resting voltage of the battery cell under test and other normal battery cells in the same cluster at multiple test times within a predetermined time period, and counting the number of times when the resting voltage of the battery cell under test is lower than the voltage of the other normal battery cells in the same cluster, and calculating the proportion of this number to the total test times, this method can effectively avoid occasional interference such as voltage sampling noise and communication interruptions, and avoid misjudgments caused by instantaneous voltage jumps, thus improving the reliability and robustness of internal short-circuit fault location. With an adjustable proportional threshold, this method can adapt to different noise levels and equalization strategies of energy storage power stations, exhibiting good engineering adaptability. Furthermore, the judgment logic only requires simple comparison, counting, and proportional operations, resulting in low computational burden and easy real-time implementation in battery management systems.

[0116] According to an embodiment of this application, the method further includes: in response to determining that multiple battery cells in the energy storage power station are in a static state, and that there is a continuous circulating current between the target battery cluster where the battery cell to be tested is located and the other battery clusters in the energy storage power station, and that the real-time static voltage of the battery cell to be tested in the static state is less than that of the other battery cells in the target battery cluster, determining that there is an internal short circuit fault in the battery cell to be tested.

[0117] For example, a target battery cluster contains 3 battery cells. The real-time static voltage of battery cell 1 to be tested is 0.1V, the real-time static voltage of battery cell 2 is 1V, the real-time static voltage of battery cell 3 is 1V, and there is a continuous circulating current between the target battery cluster and other battery clusters. Therefore, it is determined that battery cell 1 to be tested has an internal short circuit fault.

[0118] A target battery cluster contains 3 battery cells. The real-time static voltage of battery cell 1 to be tested is 0.1V, the real-time static voltage of battery cell 2 is 1V, the real-time static voltage of battery cell 3 is 1V, and there is no continuous circulating current between the target battery cluster and other battery clusters. Therefore, it is determined that battery cell 1 to be tested does not have an internal short circuit fault.

[0119] A target battery cluster contains 3 battery cells. The real-time static voltage of battery cell 1 to be tested is 0.1V, the real-time static voltage of battery cell 2 is 1V, and the real-time static voltage of battery cell 3 is 0.01V. Furthermore, there is a continuous circulating current between the target battery cluster and other battery clusters. Therefore, it is determined that battery cell 1 to be tested does not have an internal short circuit fault.

[0120] Inter-cluster circulating currents may also be caused by inconsistent states of charge between battery clusters; these circulating currents will disappear after equalization. Low individual cell voltages may also be caused by measurement errors or brief equalization processes, and are not necessarily indicative of a persistent internal short circuit. Therefore, this method combines the condition of persistent circulating current with the condition that the real-time static voltage is lower than that of the other battery cells, requiring both conditions to be met simultaneously for a definitive diagnosis of an internal short circuit fault.

[0121] The two conditions complement each other, thereby reducing the probability of misjudgment caused by unilateral anomalies due to non-internal short circuit factors such as inconsistent state of charge between battery clusters, measurement noise, and transient equalization.

[0122] Figure 5 The diagram illustrates a flowchart of determining the presence of an internal short-circuit fault in a battery cell under test based on the presence of a continuous circulating current and the real-time static voltage during the resting phase, according to an embodiment of this application.

[0123] like Figure 5 As shown, during the resting phase, the presence of an internal short circuit fault in the battery cell to be tested is determined based on the presence of a continuous circulating current and the real-time resting voltage, including operations S510 to S570.

[0124] In operation S510, in response to determining that multiple battery cells in the energy storage power station are in a static state, the port current between the target battery cluster and any other battery cluster in the multiple battery clusters and the real-time static voltage of multiple battery cells in the target battery cluster are obtained within a predetermined time period. The predetermined time period includes multiple times to be verified within the alternating time period of charging and discharging operations performed on the multiple battery cells.

[0125] The scheduled time period can be denoted as [t] stop ,t stop +Δt obs The number of multiple times to be verified can be denoted as N3.

[0126] In operation S520, from multiple times to be verified, the time when the port current between the target battery cluster and any other battery cluster in the multiple battery clusters is greater than a predetermined current threshold, and the real-time static voltage of the battery cell to be verified is less than the real-time static voltage of the other battery cells in the target battery cluster, is determined as the third target time.

[0127] In operation S530, the number of third target time points is counted. The number of third target time points can be denoted as M3.

[0128] In operation S540, determine whether the third ratio between the number of third target times and the multiple times to be verified is greater than a predetermined ratio threshold. If yes, proceed to operation S560; otherwise, proceed to operation S550. The third ratio can be denoted as R3. The predetermined ratio threshold can be denoted as R. th3 .

[0129] During the operation of S550, it was confirmed that there was no internal short circuit fault in the battery cell to be tested.

[0130] During the operation of S560, it was determined that there was an internal short circuit fault in the battery cell to be tested.

[0131] Scheduled time period [t] stop ,t stop +Δt obs [, The time to be verified is N3, the third ratio is R3, and the predetermined ratio threshold is R] th3 The selection and calculation methods of the above parameters are as described in the embodiments of operations S310 to S360, and will not be repeated here.

[0132] For the target battery cluster containing the individual battery cell to be verified, the port current I between this cluster and any other battery cluster is monitored in real time. circ (t), the resting voltage V of the battery cell to be tested. i (t), and real-time static voltage V othersIf at a certain moment both inequality (3) and inequality (5) are satisfied, then that moment is recorded as the third target moment and counted.

[0133] If R3>R th3 This indicates that for most of the observation window, there is a continuous circulating current between the target battery cluster and other battery clusters, and the voltage of the battery cell under test is consistently lower than that of other battery cells in the same cluster. In this case, it is determined that there is an internal short-circuit fault in the battery cell under test.

[0134] If R3≤R th3 If the condition is not met, it means that at least one of the above two conditions is not met. In this case, it is determined that there is no internal short circuit fault in the battery cell to be tested.

[0135] By further combining statistical analysis of two conditions—a persistent circulating current between the target battery cluster and other battery clusters, and a consistently lower resting voltage of the battery cell under test compared to other cells in the same cluster—a fault is diagnosed only when this combined ratio exceeds a predetermined threshold. This eliminates the possibility of a time-synchronous relationship between the circulating current and the low voltage.

[0136] Figure 6 The diagram illustrates a flowchart of determining the battery cell to be verified during the discharge phase according to yet another embodiment of this application.

[0137] like Figure 6 As shown, in another embodiment, determining the battery cell to be checked during the discharge stage includes operations S601 to S602.

[0138] In operation S601, in response to determining that multiple battery cells in the energy storage power station are in a discharging state, the discharge time required for each of the multiple battery cells to reach the discharge cutoff voltage in real time is obtained.

[0139] State of discharge refers to the process by which the BMS controls the output of electrical energy from individual battery cells, causing the cell voltage to drop from its full charge voltage or current voltage to the discharge cutoff voltage. The discharge cutoff voltage is the lowest voltage value that a battery cell is allowed to reach during discharge. When the cell voltage drops to this value, the discharge process automatically stops to prevent over-discharge damage to the battery cell.

[0140] In operation S602, the battery cell with the shortest discharge time is determined from multiple battery cells as the battery cell to be tested.

[0141] When the energy storage power station is in the discharge state, the BMS monitors the voltage of each battery cell in real time and records the time it takes for each battery cell to reach its first discharge cutoff voltage from the start of discharge, which is denoted as the discharge duration t of that battery cell. d,i .

[0142] Because some electrical energy is consumed through the internal short circuit during discharge of a battery cell with an internal short circuit, it cannot be output externally. Therefore, under the same discharge current and initial state of charge, the effective output of a battery cell with an internal short circuit is reduced, and its terminal voltage drops to the discharge cutoff voltage more quickly. Consequently, the discharge time t of a battery cell with an internal short circuit is longer. d,i It is the shortest discharge time t within the same battery cluster. d,min That is, it satisfies equation (6).

[0143] (6);

[0144] Among them, t d,i The duration of battery discharge due to internal short circuit is represented by t. d,min If a certain battery cell satisfies equation (6), then the battery cell is determined to be the battery cell to be tested.

[0145] After identifying the individual battery cells to be tested, in the above-mentioned resting phase execution steps, the predetermined time period [t]... stop ,t stop +Δt obs This includes multiple verification moments during the alternating periods from discharge to charging operations performed on multiple individual battery cells.

[0146] By providing an alternative method for determining the battery cell to be verified, namely, using the battery cell with the shortest discharge time in each battery cluster as the battery cell to be verified, preliminary screening can be performed based on this criterion, increasing the flexibility of the method, and it can also be used as a supplementary criterion when charging data is missing.

[0147] Figure 7 A block diagram of a battery short-circuit fault determination device for an energy storage power station according to an embodiment of this application is shown.

[0148] like Figure 7 As shown, the energy storage power station is equipped with multiple battery clusters connected in parallel, and each battery cluster is equipped with multiple battery cells connected in series. The battery internal short circuit fault determination device 700 of the energy storage power station includes an acquisition module 710, a difference module 720, a first determination module 730, and a second determination module 740.

[0149] The acquisition module 710 is used to acquire the charging time required for each of the multiple battery cells to reach the charging cutoff voltage in response to determining that multiple battery cells are in a charging state.

[0150] The difference module 720 is used to obtain the charging difference time between the multiple charging times and the first target time in each battery cluster based on the charging time of each individual battery cell in each battery cluster and the first target time in each battery cluster; wherein, the first target time represents the time required for the real-time voltage of the target battery cell that completes the charging operation the fastest in each battery cluster to reach the charging cutoff voltage.

[0151] The first determining module 730 is used to determine the battery cell corresponding to the maximum charging difference duration among a plurality of charging difference durations as the battery cell to be verified in response to determining that the maximum charging difference duration among a plurality of charging difference durations is greater than a predetermined difference threshold.

[0152] The second determination module 740 is used to determine, in response to determining that multiple battery cells in the energy storage power station are in a static state and that there is a continuous circulating current between the target battery cluster where the battery cell to be tested is located and the other battery clusters in the energy storage power station, that there is an internal short circuit fault in the battery cell to be tested.

[0153] According to embodiments of this disclosure, the second determining module 740 includes a first acquiring submodule, a first determining submodule, a first statistical submodule, and a second determining submodule.

[0154] The first acquisition submodule is used to acquire the port current between the target battery cluster and any other battery cluster in the multiple battery clusters within a predetermined time period in response to determining that multiple battery cells in the energy storage power station are in a static state; wherein, the predetermined time period includes multiple verification moments within the alternating period of charging and discharging operations performed on the multiple battery cells.

[0155] The first determining submodule is used to determine, from multiple times to be verified, the time when the port current between the target battery cluster and any other battery cluster in the multiple battery clusters is greater than a predetermined current threshold as the first target time.

[0156] The first statistics submodule is used to count the number of times the first target is reached.

[0157] The second determination submodule is used to determine that there is an internal short circuit fault in the battery cell to be verified in response to the first ratio between the number of the first target time and the multiple times to be verified being greater than a predetermined ratio threshold.

[0158] According to embodiments of this disclosure, the battery internal short-circuit fault determination device 700 of the energy storage power station may further include a third determination module.

[0159] According to an embodiment of this disclosure, the third determining module is used to determine that there is an internal short circuit fault in the battery cell to be tested in response to determining that multiple battery cells in the energy storage power station are in a static state and that the real-time static voltage of the battery cell to be tested in the static state is less than that of the other battery cells in the target battery cluster.

[0160] According to embodiments of this disclosure, the third determining module includes a second acquisition submodule, a third determining submodule, a second statistics submodule, and a fourth determining submodule.

[0161] According to an embodiment of this application, the second determining submodule is used to obtain the real-time static voltage of multiple battery cells in the target battery cluster within a predetermined time period in response to determining that multiple battery cells in the energy storage power station are in a static state; wherein, the predetermined time period includes multiple times to be verified between the time when multiple battery cells complete charging and the time when discharging operation is performed.

[0162] The third determination submodule is used to determine, from multiple times to be verified, the time when the real-time static voltage of the battery cell to be verified is less than the real-time static voltage of the other battery cells in the target battery cluster as the second target time.

[0163] The second statistics submodule is used to count the number of times the second target time is reached.

[0164] The fourth determination submodule is used to determine that there is an internal short circuit fault in the battery cell to be verified in response to the second ratio between the number of the second target time and the multiple time points to be verified being greater than a predetermined ratio threshold.

[0165] According to embodiments of this disclosure, the battery internal short-circuit fault determination device 700 of the energy storage power station may further include a fourth determination module.

[0166] According to an embodiment of this disclosure, the fourth determining module is configured to determine, in response to determining that multiple battery cells in the energy storage power station are in a static state, and that there is a continuous circulating current between the target battery cluster where the battery cell to be tested is located and the other battery clusters in the energy storage power station, and that the real-time static voltage of the battery cell to be tested in the static state is less than that of the other battery cells in the target battery cluster, that there is an internal short circuit fault in the battery cell to be tested.

[0167] According to embodiments of this disclosure, the fourth determining module includes a third obtaining submodule, a fifth determining submodule, a third statistics submodule, and a sixth determining submodule.

[0168] The third acquisition submodule is used to acquire, in response to determining that multiple battery cells in the energy storage power station are in a static state, the port current between the target battery cluster and any other battery cluster in the multiple battery clusters and the real-time static voltage of multiple battery cells in the target battery cluster within a predetermined time period; wherein, the predetermined time period includes multiple moments to be verified within the alternating period of charging and discharging operations performed on multiple battery cells.

[0169] The fifth determination submodule is used to determine, from multiple times to be verified, the time when the port current between the target battery cluster and any other battery cluster in the multiple battery clusters is greater than a predetermined current threshold, and the real-time static voltage of the battery cell to be verified is less than the real-time static voltage of the other battery cells in the target battery cluster, as the third target time.

[0170] The third statistics submodule is used to count the number of times the third target is reached.

[0171] The sixth determination submodule is used to determine that there is an internal short circuit fault in the battery cell to be verified in response to the third ratio between the number of the third target time and the multiple time to be verified being greater than a predetermined ratio threshold.

[0172] According to embodiments of this disclosure, the battery internal short-circuit fault determination device 700 of the energy storage power station may further include a fifth determination module.

[0173] According to embodiments of this disclosure, the fifth determining module includes a fourth obtaining submodule and a seventh determining submodule.

[0174] According to an embodiment of this disclosure, the fourth acquisition submodule is used to acquire the discharge time required for each of the multiple battery cells to reach the discharge cutoff voltage in response to determining that multiple battery cells are in a discharge state.

[0175] The seventh determination submodule is used to determine the battery cell with the shortest discharge time from multiple battery cells as the battery cell to be verified.

[0176] Any one or more of the modules, submodules, units, and subunits according to the embodiments of this application, or at least part of the functions of any one or more of them, can be implemented in one module. Any one or more of the modules, submodules, units, and subunits according to the embodiments of this application can be implemented by dividing them into multiple modules. Any one or more of the modules, submodules, units, and subunits according to the embodiments of this application can be at least partially implemented as hardware circuits, such as field-programmable gate arrays (FPGAs), programmable logic arrays (PLAs), systems-on-a-chip, systems-on-a-substrate, systems-on-package, application-specific integrated circuits (ASICs), or implemented by hardware or firmware in any other reasonable manner by integrating or packaging circuits, or implemented in any one of software, hardware, and firmware, or in a suitable combination of any of these. Alternatively, one or more of the modules, submodules, units, and subunits according to the embodiments of this application can be at least partially implemented as computer program modules, which, when run, can perform corresponding functions.

[0177] For example, any multiple of the acquisition module 710, difference module 720, first determination module 730, and second determination module 740 can be combined into one module / unit / subunit, or any one of these modules / units / subunits can be split into multiple modules / units / subunits. Alternatively, at least part of the functionality of one or more of these modules / units / subunits can be combined with at least part of the functionality of other modules / units / subunits and implemented in one module / unit / subunit. According to embodiments of this application, at least one of the acquisition module 710, difference module 720, first determination module 730, and second determination module 740 can be at least partially implemented as hardware circuitry, such as a field-programmable gate array (FPGA), a programmable logic array (PLA), a system-on-a-chip, a system-on-a-substrate, a system-on-package, an application-specific integrated circuit (ASIC), or any other reasonable means of integrating or packaging circuitry, or implemented in software, hardware, or firmware, or in any suitable combination of any of these three implementation methods. Alternatively, at least one of the acquisition module 710, the difference module 720, the first determination module 730, and the second determination module 740 may be implemented at least partially as a computer program module, which can perform corresponding functions when the computer program module is run.

[0178] Figure 8 A block diagram of an electronic device for determining a battery short-circuit fault in an energy storage power station according to an embodiment of this application is shown. Figure 8 The electronic device shown is merely an example and should not impose any limitation on the functionality and scope of use of the embodiments of this application.

[0179] like Figure 8 As shown, an electronic device 800 according to an embodiment of this application includes a processor 801, which can perform various appropriate actions and processes according to a program stored in a ROM 802 or a program loaded from a storage portion 808 into a RAM 803. The processor 801 may include, for example, a general-purpose microprocessor (e.g., a CPU), an instruction set processor and / or an associated chipset and / or a special-purpose microprocessor (e.g., an application-specific integrated circuit (ASIC)), etc. The processor 801 may also include onboard memory for caching purposes. The processor 801 may include a single processing unit or multiple processing units for performing different actions of the method flow according to an embodiment of this application. Wherein, ROM is a read-only memory, and RAM is a random access memory.

[0180] RAM 803 stores various programs and data required for the operation of electronic device 800. Processor 801, ROM 802, and RAM 803 are interconnected via bus 804. Processor 801 executes various operations of the method flow according to embodiments of this application by executing programs in ROM 802 and / or RAM 803. It should be noted that the programs may also be stored in one or more memories other than ROM 802 and RAM 803. Processor 801 may also execute various operations of the method flow according to embodiments of this application by executing programs stored in said one or more memories.

[0181] According to embodiments of this application, the electronic device 800 may further include an input / output (I / O) interface 805, which is also connected to a bus 804. The electronic device 800 may also include one or more of the following components connected to the input / output (I / O) interface 805: an input section 806 including a keyboard, mouse, etc.; an output section 807 including a cathode ray tube (CRT), liquid crystal display (LCD), etc., and a speaker, etc.; a storage section 808 including a hard disk, etc.; and a communication section 809 including a network interface card such as a LAN card, modem, etc. The communication section 809 performs communication processing via a network such as the Internet. A drive 810 is also connected to the input / output (I / O) interface 805 as needed. A removable medium 811, such as a disk, optical disk, magneto-optical disk, semiconductor memory, etc., is installed on the drive 810 as needed so that computer programs read from it can be installed into the storage section 808 as needed.

[0182] According to embodiments of this application, the method flow according to embodiments of this application can be implemented as a computer software program. For example, embodiments of this application include a computer program product comprising a computer program carried on a computer-readable storage medium, the computer program containing program code for performing the method shown in the flowchart. In such embodiments, the computer program can be downloaded and installed from a network via communication section 809, and / or installed from removable medium 811. When the computer program is executed by processor 801, it performs the functions defined in the system of embodiments of this application. According to embodiments of this application, the systems, devices, apparatuses, modules, units, etc., described above can be implemented by computer program modules.

[0183] This application also provides a computer-readable storage medium, which may be included in the device / apparatus / system described in the above embodiments; or it may exist independently and not assembled into the device / apparatus / system. The computer-readable storage medium carries one or more programs, which, when executed, implement the method according to the embodiments of this application.

[0184] According to embodiments of this application, the computer-readable storage medium can be a non-volatile computer-readable storage medium. Examples include, but are not limited to: portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof. In this application, the computer-readable storage medium can be any tangible medium containing or storing a program that can be used by or in conjunction with an instruction execution system, apparatus, or device.

[0185] For example, according to embodiments of this application, a computer-readable storage medium may include ROM 802 and / or RAM 803 and / or one or more memories other than ROM 802 and RAM 803 as described above.

[0186] The embodiments of this application also include a computer program product, which includes a computer program containing program code for executing the methods provided in the embodiments of this application. When the computer program product is run on an electronic device, the program code is used to enable the electronic device to implement the battery short-circuit fault diagnosis method for energy storage power stations provided in the embodiments of this application.

[0187] When the computer program is executed by the processor 801, it performs the functions defined in the system / apparatus of this application embodiment. According to the embodiments of this application, the systems, apparatuses, modules, units, etc., described above can be implemented by computer program modules.

[0188] In one embodiment, the computer program may rely on a tangible storage medium such as an optical storage device or a magnetic storage device. In another embodiment, the computer program may also be transmitted and distributed in the form of signals over a network medium, and downloaded and installed via the communication section 809, and / or installed from a removable medium 811. The program code contained in the computer program can be transmitted using any suitable network medium, including but not limited to: wireless, wired, etc., or any suitable combination thereof.

[0189] According to embodiments of this application, program code for executing the computer programs provided in the embodiments of this application can be written in any combination of one or more programming languages. Specifically, these computational programs can be implemented using high-level procedural and / or object-oriented programming languages, and / or assembly / machine languages. Programming languages ​​include, but are not limited to, languages ​​such as Java, C++, Python, "C", or similar programming languages. The program code can be executed entirely on the user's computing device, partially on the user's device, partially on a remote computing device, or entirely on a remote computing device or server. In cases involving remote computing devices, the remote computing device can be connected to the user's computing device via any type of network, including a local area network (LAN) or a wide area network (WAN), or it can be connected to an external computing device (e.g., via the Internet using an Internet service provider).

[0190] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of this application. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions indicated in the blocks may occur in a different order than those indicated in the drawings. For example, two consecutively indicated blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in a block diagram or flowchart, and combinations of blocks in a block diagram or flowchart, may be implemented using a dedicated hardware-based system that performs the specified function or operation, or using a combination of dedicated hardware and computer instructions. Those skilled in the art will understand that the features described in the various embodiments of this application can be combined and / or combined in various ways, even if such combinations are not explicitly described in this application. In particular, without departing from the spirit and teachings of this application, the features described in the various embodiments of this application can be combined and / or combined in various ways. All such combinations and / or combinations fall within the scope of this application.

[0191] The embodiments of this application have been described above. However, these embodiments are merely illustrative and not intended to limit the scope of this application. Although various embodiments have been described above, this does not mean that the measures in the various embodiments cannot be used advantageously in combination. Without departing from the scope of this application, those skilled in the art can make various substitutions and modifications, all of which should fall within the scope of this application.

Claims

1. A method for determining internal short-circuit faults in the batteries of an energy storage power station, wherein the energy storage power station is configured with multiple battery clusters connected in parallel, and each battery cluster is configured with multiple battery cells connected in series, characterized in that, The method for determining internal short-circuit faults in the battery includes: In response to determining that multiple battery cells in the energy storage power station are in a charging state, the charging time required for each of the multiple battery cells to reach the charging cutoff voltage in real time is obtained; wherein, the charging cutoff voltage is a preset upper limit voltage value reached by the battery cell during the charging process, and when the voltage of the battery cell reaches this value, the charging process will automatically stop to avoid overcharging; the charging time is the time elapsed from the start of charging to the first time the battery cell reaches the charging cutoff voltage; Based on the charging time of each individual battery cell in each battery cluster and the first target time in each battery cluster, the charging difference time between the multiple charging times and the first target time in each battery cluster is obtained; wherein, the first target time represents the time required for the real-time voltage of the target battery cell that completes the charging operation the fastest in each battery cluster to reach the charging cutoff voltage. In response to determining that the maximum charging difference duration among a plurality of said charging difference durations is greater than a predetermined difference threshold, the battery cell corresponding to the maximum charging difference duration is determined as the battery cell to be verified; and In response to determining that multiple battery cells in the energy storage power station are in a static state, and that there is a continuous circulating current between the target battery cluster where the battery cell to be tested is located and the other battery clusters in the energy storage power station, it is determined that there is an internal short circuit fault in the battery cell to be tested.

2. The method for determining internal short-circuit faults in a battery according to claim 1, characterized in that, The response to determining that multiple battery cells in the energy storage power station are in a static state, and that there is a continuous circulating current between the target battery cluster containing the battery cell to be tested and the other battery clusters in the energy storage power station, and determining that there is an internal short-circuit fault in the battery cell to be tested, includes: In response to determining that multiple battery cells in the energy storage power station are in a static state, the port current between the target battery cluster and any other battery cluster in the multiple battery clusters is obtained within a predetermined time period; wherein, the predetermined time period includes multiple verification moments within the alternating period of charging and discharging operations performed on the multiple battery cells; From multiple times to be verified, the first target time is determined as the time when the port current between the target battery cluster and any other battery cluster in the multiple battery clusters is greater than a predetermined current threshold. Count the number of times the first target time is reached; and In response to determining that the first ratio between the number of the first target time moments and the plurality of time moments to be verified is greater than a predetermined ratio threshold, it is determined that there is an internal short circuit fault in the battery cell to be verified.

3. The method for determining internal short-circuit faults in a battery according to claim 1, characterized in that, The method for determining internal short-circuit faults in the battery also includes: In response to determining that multiple battery cells in the energy storage power station are in a static state, and that the real-time static voltage of the battery cell to be tested in the static state is less than that of the other battery cells in the target battery cluster, it is determined that there is an internal short circuit fault in the battery cell to be tested.

4. The method for determining internal short-circuit faults in a battery according to claim 3, characterized in that, The response to determining that multiple battery cells in the energy storage power station are in a static state, and that the real-time static voltage of the battery cell to be tested in the static state is less than that of the other battery cells in the target battery cluster, and determining that there is an internal short-circuit fault in the battery cell to be tested, includes: In response to determining that multiple battery cells in the energy storage power station are in a static state, the real-time static voltage of multiple battery cells in the target battery cluster is obtained within a predetermined time period; wherein, the predetermined time period includes multiple verification times between the time when the multiple battery cells complete charging and the time when the discharge operation is performed; From multiple verification times, the moment when the real-time static voltage of the battery cell to be verified is less than the real-time static voltage of the other battery cells in the target battery cluster is determined as the second target time. Count the number of the second target time points; and In response to determining that the second ratio between the number of the second target time and the plurality of time to be verified is greater than a predetermined ratio threshold, it is determined that there is an internal short circuit fault in the battery cell to be verified.

5. The method for determining internal short-circuit faults in a battery according to claim 1, characterized in that, The method further includes: In response to determining that multiple battery cells in the energy storage power station are in a static state, and that there is a continuous circulating current between the target battery cluster where the battery cell to be tested is located and the other battery clusters in the energy storage power station, and that the real-time static voltage of the battery cell to be tested in the static state is less than that of the other battery cells in the target battery cluster, it is determined that there is an internal short circuit fault in the battery cell to be tested.

6. The method for determining internal short-circuit faults in a battery according to claim 5, characterized in that, The response to determining that multiple battery cells in the energy storage power station are in a static state, and that there is a continuous circulating current between the target battery cluster containing the battery cell to be tested and the other battery clusters in the energy storage power station, and that the real-time static voltage of the battery cell to be tested in the static state is less than that of the other battery cells in the target battery cluster, and determining that there is an internal short-circuit fault in the battery cell to be tested, includes: In response to determining that multiple battery cells in the energy storage power station are in a static state, the port current between the target battery cluster and any other battery cluster in the multiple battery clusters and the real-time static voltage of multiple battery cells in the target battery cluster are obtained within a predetermined time period; wherein, the predetermined time period includes multiple moments to be verified within the alternating time period of charging and discharging operations performed on the multiple battery cells. The third target time is determined from multiple test times when the port current between the target battery cluster and any other battery cluster in the multiple battery clusters is greater than a predetermined current threshold, and the real-time static voltage of the battery cell to be tested is less than the real-time static voltage of the other battery cells in the target battery cluster. Count the number of times the third target is reached; and In response to determining that the third ratio between the number of the third target time and the plurality of time to be verified is greater than a predetermined ratio threshold, it is determined that there is an internal short circuit fault in the battery cell to be verified.

7. The method for determining internal short-circuit faults in a battery according to claim 1, characterized in that, The method further includes: In response to determining that multiple battery cells in the energy storage power station are in a discharging state, the system acquires the discharge time required for each of the multiple battery cells to reach its real-time discharge cutoff voltage; and The battery cell with the shortest discharge time among the multiple battery cells is selected as the battery cell to be tested.

8. A device for determining internal short-circuit faults in a battery of an energy storage power station, wherein the energy storage power station is configured with multiple battery clusters connected in parallel, and each battery cluster is configured with multiple battery cells connected in series, characterized in that, The battery internal short circuit fault determination device includes: The acquisition module is used to, in response to determining that multiple battery cells in the energy storage power station are in a charging state, acquire the charging time required for each of the multiple battery cells to reach the charging cutoff voltage in real time; wherein, the charging cutoff voltage is a preset upper limit voltage value reached by the battery cell during the charging process, and when the voltage of the battery cell reaches this value, the charging process will automatically stop to avoid overcharging; the charging time is the time elapsed from the start of charging to the first time the battery cell reaches the charging cutoff voltage; The difference module is used to obtain the charging difference time between the multiple charging times and the first target time in each battery cluster based on the charging time of each of the multiple battery cells in each battery cluster and the first target time in each battery cluster; wherein, the first target time represents the time required for the real-time voltage of the target battery cell that completes the charging operation the fastest in each battery cluster to reach the charging cutoff voltage. A first determining module is configured to, in response to determining that the maximum charging difference duration among a plurality of said charging difference durations is greater than a predetermined difference threshold, determine the battery cell corresponding to the maximum charging difference duration as the battery cell to be verified; and The second determining module is used to determine, in response to determining that multiple battery cells in the energy storage power station are in a static state and that there is a continuous circulating current between the target battery cluster where the battery cell to be tested is located and the other battery clusters in the energy storage power station, that there is an internal short circuit fault in the battery cell to be tested.

9. An electronic device, characterized in that, include: One or more processors; Memory, used to store one or more programs. Wherein, when the one or more programs are executed by the one or more processors, the one or more processors implement the method of any one of claims 1 to 7.

10. A computer-readable storage medium having executable instructions stored thereon, characterized in that, When executed by the processor, this instruction causes the processor to implement the method of any one of claims 1 to 7.

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