Energy storage system current determination method, device, apparatus and storage medium

Abstract

The application provides a kind of energy storage system current determination method, device, equipment and storage medium, wherein the method comprises: obtaining the system information of energy storage system, the maximum preset temperature of energy storage system and the ambient temperature of energy storage system;Obtain the abnormal information of temperature abnormal point at temperature rise abnormal moment;After temperature rise abnormal moment, the temperature of temperature abnormal point of energy storage system is collected according to preset time length, and the abnormal point temperature rise rate of energy storage system is determined according to the collected temperature;According to the system information of energy storage system, abnormal information, abnormal point temperature rise rate and the ambient temperature of energy storage system, the contact resistance value corresponding to abnormal battery cluster in energy storage system is determined;According to the contact resistance value, firmware parameter, ambient temperature and maximum preset temperature, the maximum allowable current corresponding to abnormal battery cluster in energy storage system is calculated.The application can realize the temperature control of abnormal battery cluster, improve the stability, reliability and safety of energy storage system.

Description

Technical Field

[0001] This application relates to the field of energy storage system anomaly handling technology, and more specifically, to a method, apparatus, device and storage medium for determining the current of an energy storage system. Background Technology

[0002] An energy storage system is a system that stores energy, such as electrical energy, through various media and releases it when needed.

[0003] In existing technologies, when an electrical connection point of an energy storage system is abnormal, causing the system to overheat, the usual solution is to directly shut down the energy storage system.

[0004] However, this approach can significantly reduce the stability of energy storage systems, leading to unstable and unreliable power supply. Summary of the Invention

[0005] The purpose of this application is to address the shortcomings of the prior art by providing a method, apparatus, device, and storage medium for determining the current of an energy storage system, thereby solving the problem of unstable and unreliable power supply when an energy storage system experiences an overheating fault.

[0006] To achieve the above objectives, the technical solutions adopted in the embodiments of this application are as follows:

[0007] In a first aspect, one embodiment of this application provides a method for determining the current of an energy storage system, the method comprising:

[0008] The system information of the energy storage system, the maximum preset temperature of the energy storage system, and the ambient temperature of the energy storage system are obtained. The system information includes the operating information of the energy storage system and the firmware parameters of the energy storage system.

[0009] Obtain abnormal information of the temperature anomaly point at the time of abnormal temperature rise, the abnormal information including: abnormal temperature current and abnormal temperature;

[0010] After the abnormal temperature rise time, the temperature of the abnormal point of the energy storage system is collected for a preset time period, and the temperature rise rate of the abnormal point of the energy storage system is determined based on the collected temperature.

[0011] Based on the system information of the energy storage system, the anomaly information, the temperature rise rate of the anomaly point, and the ambient temperature of the energy storage system, determine the contact resistance value corresponding to the abnormal battery cluster in the energy storage system.

[0012] Based on the contact resistance value, the firmware parameters, the ambient temperature, and the maximum preset temperature, the maximum allowable current corresponding to the abnormal battery cluster in the energy storage system is calculated.

[0013] In one possible implementation, determining the contact resistance value corresponding to the abnormal battery cluster in the energy storage system based on the system information of the energy storage system, the anomaly information, the rate of change of temperature rise at the anomaly point, and the ambient temperature of the energy storage system includes:

[0014] Based on the operating information of the energy storage system and the abnormal temperature current, determine the target abnormal temperature current corresponding to the abnormal battery cluster in the energy storage system.

[0015] The contact resistance value is calculated based on the abnormal current at the target temperature, the rate of change of temperature rise at the abnormal point, the firmware parameters of the energy storage system, the abnormal temperature, and the ambient temperature of the energy storage system.

[0016] In one possible implementation, the operating information of the energy storage system includes: the series-parallel connection mode of each cell in the energy storage system, whether each battery cluster in the energy storage system is connected in series with a DC-DC converter, and the number of cells connected in parallel in each battery cluster in the energy storage system.

[0017] The step of determining the target abnormal temperature current corresponding to the abnormal battery cluster in the energy storage system based on the operating information of the energy storage system and the abnormal temperature current includes:

[0018] If the cells in the energy storage system are connected in series, then the abnormal temperature current is taken as the target abnormal temperature current corresponding to the abnormal battery cluster in the energy storage system.

[0019] If the cells in the energy storage system are connected in parallel, the abnormal temperature point corresponding to the abnormal temperature current is obtained, and the target abnormal temperature current corresponding to the abnormal battery cluster in the energy storage system is determined based on the abnormal temperature point and the abnormal temperature current.

[0020] In one possible implementation, determining the target abnormal temperature current corresponding to the abnormal battery cluster in the energy storage system based on the abnormal temperature location and the abnormal temperature current includes:

[0021] Determine whether the temperature anomaly point is within the first preset location range; if so, then use the temperature anomaly current as the target temperature anomaly current.

[0022] If not, the abnormal temperature current is multiplied by the number of cells connected in parallel in the abnormal battery cluster to obtain the target abnormal temperature current.

[0023] In one possible implementation, calculating the contact resistance value based on the target temperature anomaly current, the rate of change of temperature rise at the anomaly point, the firmware parameters of the energy storage system, the anomaly temperature, and the ambient temperature of the energy storage system includes:

[0024] The contact resistance value is obtained by inputting the target temperature abnormal current, the abnormal point temperature rise rate, the firmware parameters of the energy storage system, the abnormal temperature, and the ambient temperature of the energy storage system into a pre-constructed temperature change rate equation.

[0025] In one possible implementation, calculating the maximum allowable current corresponding to the abnormal battery cluster in the energy storage system based on the contact resistance value, the firmware parameters, the ambient temperature, and the maximum preset temperature includes:

[0026] The contact resistance value, firmware parameters, ambient temperature, and maximum preset temperature are input into a pre-constructed current equation to solve for the maximum allowable current corresponding to the abnormal battery cluster in the energy storage system.

[0027] In one possible implementation, the method further includes:

[0028] The maximum allowable current of the energy storage system is determined based on the operating information of the energy storage system and the maximum allowable current corresponding to the abnormal battery clusters in the energy storage system.

[0029] In one possible implementation, determining the maximum allowable current of the energy storage system based on the operating information of the energy storage system and the maximum allowable current corresponding to the abnormal battery cluster in the energy storage system includes:

[0030] Determine the maximum allowable current for other battery clusters in the energy storage system;

[0031] The maximum allowable current of the energy storage system is determined based on the operating information of the energy storage system, the maximum allowable current of other battery clusters in the energy storage system, and the maximum allowable current corresponding to the abnormal battery clusters in the energy storage system.

[0032] In one possible implementation, determining the maximum allowable current of the energy storage system based on the operating information of the energy storage system, the maximum allowable current of other battery clusters in the energy storage system, and the maximum allowable current corresponding to the abnormal battery clusters in the energy storage system includes:

[0033] If each battery cluster in the energy storage system contains a series DC-DC converter, the maximum allowable current of other battery clusters in the energy storage system and the sum of the maximum allowable current of the abnormal battery cluster in the energy storage system are calculated, and the result is taken as the maximum allowable current of the energy storage system.

[0034] In one possible implementation, determining the maximum allowable current of the energy storage system based on the operating information of the energy storage system, the maximum allowable current of other battery clusters in the energy storage system, and the maximum allowable current corresponding to the abnormal battery clusters in the energy storage system includes:

[0035] If there is no series DC-DC converter in each battery cluster of the energy storage system, then determine the minimum value of the maximum allowable current of the other battery clusters in the energy storage system and the minimum value of the maximum allowable current of the abnormal battery cluster in the energy storage system, and calculate the product of the minimum value and the number of parallel battery clusters in the energy storage system. The result is taken as the maximum allowable current of the energy storage system.

[0036] Secondly, another embodiment of this application provides an energy storage system current determination device, the device comprising:

[0037] The first acquisition module is used to acquire system information of the energy storage system, the maximum preset temperature of the energy storage system, and the ambient temperature of the energy storage system. The system information includes the operating information of the energy storage system and the firmware parameters of the energy storage system.

[0038] The second acquisition module is used to acquire abnormal information of the temperature abnormal point at the time of abnormal temperature rise. The abnormal information includes: abnormal temperature current and abnormal temperature.

[0039] The data acquisition module is used to acquire the temperature of the abnormal temperature point of the energy storage system after the abnormal temperature rise time, according to a preset time interval, and to determine the rate of change of the abnormal temperature point of the energy storage system based on the acquired temperature.

[0040] The first determining module is used to determine the contact resistance value corresponding to the abnormal battery cluster in the energy storage system based on the system information of the energy storage system, the abnormal information, the temperature rise change rate of the abnormal point, and the ambient temperature of the energy storage system.

[0041] The second determining module is used to calculate the maximum allowable current corresponding to the abnormal battery cluster in the energy storage system based on the contact resistance value, the firmware parameters, the ambient temperature, and the maximum preset temperature.

[0042] In one possible implementation, the first determining module is specifically used for:

[0043] Based on the operating information of the energy storage system and the abnormal temperature current, determine the target abnormal temperature current corresponding to the abnormal battery cluster in the energy storage system.

[0044] The contact resistance value is calculated based on the abnormal current at the target temperature, the rate of change of temperature rise at the abnormal point, the firmware parameters of the energy storage system, the abnormal temperature, and the ambient temperature of the energy storage system.

[0045] In one possible implementation, the operating information of the energy storage system includes: the series-parallel connection mode of each cell in the energy storage system, whether each battery cluster in the energy storage system has a series DC-DC converter, and the number of cells connected in parallel in each battery cluster in the energy storage system; the first determining module is specifically used for:

[0046] If the cells in the energy storage system are connected in series, then the abnormal temperature current is taken as the target abnormal temperature current corresponding to the abnormal battery cluster in the energy storage system.

[0047] If the cells in the energy storage system are connected in parallel, the abnormal temperature point corresponding to the abnormal temperature current is obtained, and the target abnormal temperature current corresponding to the abnormal battery cluster in the energy storage system is determined based on the abnormal temperature point and the abnormal temperature current.

[0048] In one possible implementation, the first determining module is specifically used for:

[0049] Determine whether the temperature anomaly point is within the first preset location range; if so, then use the temperature anomaly current as the target temperature anomaly current.

[0050] If not, the abnormal temperature current is multiplied by the number of cells connected in parallel in the abnormal battery cluster to obtain the target abnormal temperature current.

[0051] In one possible implementation, the first determining module is specifically used for:

[0052] The contact resistance value is obtained by inputting the target temperature abnormal current, the abnormal point temperature rise rate, the firmware parameters of the energy storage system, the abnormal temperature, and the ambient temperature of the energy storage system into a pre-constructed temperature change rate equation.

[0053] In one possible implementation, the second determining module is specifically used for:

[0054] The contact resistance value, firmware parameters, ambient temperature, and maximum preset temperature are input into a pre-constructed current equation to solve for the maximum allowable current corresponding to the abnormal battery cluster in the energy storage system.

[0055] In one possible implementation, the apparatus further includes: a third determining module, configured to:

[0056] The maximum allowable current of the energy storage system is determined based on the operating information of the energy storage system and the maximum allowable current corresponding to the abnormal battery clusters in the energy storage system.

[0057] In one possible implementation, the third determining module is specifically used for:

[0058] Determine the maximum allowable current for other battery clusters in the energy storage system;

[0059] The maximum allowable current of the energy storage system is determined based on the operating information of the energy storage system, the maximum allowable current of other battery clusters in the energy storage system, and the maximum allowable current corresponding to the abnormal battery clusters in the energy storage system.

[0060] In one possible implementation, the third determining module is specifically used for:

[0061] If each battery cluster in the energy storage system contains a series DC-DC converter, the maximum allowable current of other battery clusters in the energy storage system and the sum of the maximum allowable current of the abnormal battery cluster in the energy storage system are calculated, and the result is taken as the maximum allowable current of the energy storage system.

[0062] In one possible implementation, the third determining module is specifically used for:

[0063] If there is no series DC-DC converter in each battery cluster of the energy storage system, then determine the minimum value of the maximum allowable current of the other battery clusters in the energy storage system and the minimum value of the maximum allowable current of the abnormal battery cluster in the energy storage system, and calculate the product of the minimum value and the number of parallel battery clusters in the energy storage system. The result is taken as the maximum allowable current of the energy storage system.

[0064] Thirdly, another embodiment of this application provides an electronic device, including: a processor, a storage medium, and a bus, wherein the storage medium stores machine-readable instructions executable by the processor, and when the electronic device is running, the processor communicates with the storage medium via the bus, and the processor executes the machine-readable instructions to perform the steps of any of the methods described in the first aspect above.

[0065] Fourthly, another embodiment of this application provides a storage medium storing a computer program, which, when executed by a processor, performs the steps of any of the methods described in the first aspect above.

[0066] The beneficial effects of this application are as follows: By acquiring system information, maximum preset temperature, and ambient temperature of the energy storage system, and when an electrical connection point contact anomaly occurs in the energy storage system, abnormal information of the temperature anomaly point at the moment of abnormal temperature rise is obtained. Simultaneously, after the moment of abnormal temperature rise, the temperature of the abnormal point in the energy storage system is collected for a preset duration, and the temperature rise rate of the abnormal point is determined based on the collected temperature. This allows the contact resistance value corresponding to the abnormal battery cluster in the energy storage system to be determined based on the system information, abnormal information, temperature rise rate of the abnormal point, and ambient temperature. Then, based on the contact resistance value, firmware parameters, ambient temperature, and maximum preset temperature, the maximum allowable current corresponding to the abnormal battery cluster in the energy storage system can be calculated. This allows for adjustment of the current of the abnormal battery cluster using the maximum allowable current, enabling temperature control of the abnormal battery cluster without stopping the operation of the energy storage system, thus improving the stability, reliability, and safety of the energy storage system operation. Attached Figure Description

[0067] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0068] Figure 1 A schematic diagram of the structure of an energy storage system provided in an embodiment of this application;

[0069] Figure 2 This is a schematic diagram of a battery pack in an energy storage system provided in an embodiment of this application;

[0070] Figure 3 This is a schematic diagram of another structure of the battery pack in the energy storage system provided in the embodiments of this application;

[0071] Figure 4 A schematic flowchart of a method for determining the current of an energy storage system provided in an embodiment of this application;

[0072] Figure 5 This is a schematic flowchart illustrating the process of determining the contact resistance value of an energy storage system in the energy storage system current determination method provided in this application embodiment.

[0073] Figure 6 This is a schematic flowchart illustrating the process of determining the target temperature anomaly current of an energy storage system in the energy storage system current determination method provided in this application embodiment.

[0074] Figure 7Another flowchart illustrating the determination of the target temperature anomaly current of the energy storage system in the energy storage system current determination method provided in the embodiments of this application;

[0075] Figure 8 A flowchart illustrating the determination of the maximum allowable current of an energy storage system in the energy storage system current determination method provided in this application embodiment;

[0076] Figure 9 A schematic diagram of an energy storage system current determination device provided in an embodiment of this application;

[0077] Figure 10 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application. Detailed Implementation

[0078] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. It should be understood that the accompanying drawings in this application are for illustrative and descriptive purposes only and are not intended to limit the scope of protection of this application. Furthermore, it should be understood that the schematic drawings are not drawn to scale. The flowcharts used in this application illustrate operations implemented according to some embodiments of this application. It should be understood that the operations in the flowcharts may not be implemented in sequence, and steps without logical contextual relationships may be reversed or implemented simultaneously. In addition, those skilled in the art, guided by the content of this application, may add one or more other operations to the flowcharts, or remove one or more operations from the flowcharts.

[0079] Furthermore, the described embodiments are merely some, not all, of the embodiments of this application. The components of the embodiments of this application described and illustrated herein can typically be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0080] It should be noted that the term "comprising" will be used in the embodiments of this application to indicate the presence of the features declared thereafter, but does not exclude the addition of other features.

[0081] In existing technologies, the requirements for charge / discharge rates of energy storage systems are becoming increasingly stringent, especially in the fields of vehicle power batteries and energy storage systems involved in peak shaving and frequency regulation, where the current flowing through a single cell is very large. Lithium-ion battery system architecture includes numerous cells and electrical connectors, resulting in a large number of electrical connection points. During production, transportation, and operation, these connections are prone to loosening due to vibration or other factors, causing abnormally high contact resistance. Under high current flow, this generates significant Joule heat, leading to abnormally high temperatures at the electrical connection points. When abnormal contact occurs at these electrical connection points, causing overheating faults in the energy storage system, it typically triggers a complete shutdown of the system.

[0082] However, the approach of directly stopping the energy storage system when an electrical connection point becomes abnormal will significantly reduce the stability of the energy storage system, leading to unstable and unreliable power supply.

[0083] Based on the aforementioned problems, this application proposes a method for determining the current of an energy storage system. This method acquires system information, the maximum preset temperature, and the ambient temperature of the energy storage system. When an electrical connection point in the energy storage system experiences an abnormal contact, it acquires the abnormal information of the temperature anomaly point at the moment of abnormal temperature rise. Simultaneously, after the abnormal temperature rise moment, it collects the temperature of the abnormal point of the energy storage system for a preset duration and determines the rate of temperature change at the abnormal point based on the collected temperatures. This allows the contact resistance value corresponding to the abnormal battery cluster in the energy storage system to be determined based on the system information, abnormal information, the rate of temperature change at the abnormal point, and the ambient temperature. Then, based on the contact resistance value, firmware parameters, ambient temperature, and the maximum preset temperature, the maximum allowable current corresponding to the abnormal battery cluster in the energy storage system can be calculated. This enables temperature control of the abnormal battery cluster through the maximum allowable current without stopping the operation of the energy storage system, improving the stability, reliability, and safety of the energy storage system operation.

[0084] First, an exemplary description will be given of the energy storage system involved in the energy storage system current determination method provided in the embodiments of this application.

[0085] Figure 1 A schematic diagram of an energy storage system provided in an embodiment of this application is shown below. Figure 1 As shown, the energy storage system can be a containerized energy storage system, which includes at least: multiple parallel-connected battery clusters, a battery management system (BMS), a power conversion system (PCS), and multiple firmware (not shown in the figure).

[0086] Each battery cluster comprises multiple battery packs connected in series, and each battery pack comprises multiple battery cells. The Battery Management System (BMS) includes a main BMS located outside each battery cluster, cluster BMS located within each battery cluster but outside each battery pack, and package BMS located within each battery pack. The main BMS is communicatively connected to each cluster BMS and each package BMS. The Process Control System (PCS) is electrically connected to each battery cluster.

[0087] Optionally, each battery cluster may also include a DC-DC converter (not shown in the figure). The DC-DC converter can be connected in series with the battery pack in each battery cluster or in parallel with the battery pack in each battery cluster.

[0088] Optionally, each battery pack includes multiple battery cells and at least one temperature sensor (NTC) (not shown in the figure). Figure 2 This is a schematic diagram of a battery pack structure in an energy storage system provided in an embodiment of this application, with reference to... Figure 2 As shown, individual battery cells can be directly connected in series, or they can be connected in series to form a module, and then connected in series again. Figure 3 This is another structural schematic diagram of the battery pack in the energy storage system provided in the embodiments of this application, referred to... Figure 3 As shown, the individual cells can be connected in series to form a module, and then connected in parallel.

[0089] The firmware can be a connector, specifically a copper busbar connector, used to connect the battery modules, battery management system and positive and negative terminals in the energy storage system. The firmware can be set between and around the battery modules, between the battery modules and the battery management system, or between the battery modules and the positive and negative terminals.

[0090] It should be understood that before the energy storage system provided in this application embodiment is put into operation, the battery management system can configure relevant parameters for the operation of the energy storage system. For example, the maximum allowable current of each battery cluster in the energy storage system can be configured so that the energy storage system operates according to the maximum allowable current of each battery cluster in the energy storage system. During the operation of the energy storage system, the battery management system can monitor the operating temperature of the energy storage system through a temperature sensor. When an abnormal temperature occurs, the steps of the energy storage system current determination method provided in this application embodiment are executed to determine the maximum allowable current corresponding to the abnormal battery cluster and update the maximum allowable current corresponding to the abnormal battery cluster. In this way, the temperature of the abnormal battery cluster can be adjusted by adjusting the current of the abnormal battery cluster, so that the energy storage system can control the temperature of the abnormal battery cluster without stopping the operation of the energy storage system, thereby improving the stability, reliability and safety of the energy storage system operation process.

[0091] The method for determining the current of an energy storage system provided in this application will be described in detail below with reference to several embodiments.

[0092] Figure 4 This is a flowchart illustrating a method for determining the current of an energy storage system provided in an embodiment of this application, with reference to... Figure 4 As shown, the execution entity of this method can be the aforementioned BMS, and the method includes:

[0093] S401. Obtain system information of the energy storage system, the maximum preset temperature of the energy storage system, and the ambient temperature of the energy storage system.

[0094] Optionally, the BMS can pre-store the system information of the energy storage system. The BMS can first read the system information, the maximum preset temperature of the energy storage system, and the ambient temperature of the energy storage system.

[0095] The system information of the energy storage system includes its operational information and firmware parameters. Specifically, the operational information refers to basic parameters related to the operation of the energy storage system, including the number of battery clusters, the number of battery packs within each cluster, the number of cells within each pack, the series or parallel connection method between cells, whether each cluster is connected in series with a DC-DC converter, and the maximum allowable current for each cluster. The firmware parameters indicate the parameter information of each component in the system, specifically the heat dissipation power factor, rated current, and rated voltage of each copper busbar connector.

[0096] The maximum preset temperature of the energy storage system refers to the highest temperature limit that the energy storage system is allowed to reach during normal operation.

[0097] The ambient temperature of an energy storage system refers to the temperature of the surrounding environment in which the energy storage system is located, such as the temperature of the surrounding air.

[0098] Optionally, the heat dissipation power coefficient of the copper busbar connector in the energy storage system can be calculated through prior testing. For example, the heat dissipation power of the connector can be calculated based on the temperature drop curve of the abnormal temperature point after the energy storage system's over-temperature protection. Specifically, the energy storage system can be switched from an operating state to a static state at the moment of temperature anomaly. At this time, the temperature at the abnormal point dissipates heat from a higher temperature, i.e., cooling occurs. The temperature drop data can be fitted using a preset function to obtain a temperature drop curve, and the slope of the temperature drop curve can be determined, which is the heat dissipation power coefficient of the copper busbar connector.

[0099] For example, the preset function can be shown in the following formula (1):

[0100] T = Ae Bt +C (1)

[0101] For example, the heat dissipation power coefficient λ of the copper busbar connector can be represented by the following formula (2):

[0102]

[0103] Where T is the temperature of the temperature anomaly point, T amb For ambient temperature, C p ρ is the specific heat capacity of the copper conductor, and m is the mass of the copper.

[0104] S402. Obtain abnormal information of temperature anomaly points at the time of abnormal temperature rise.

[0105] Optionally, the BMS can monitor the temperature at each collection point in the energy storage system through temperature sensors during the operation of the energy storage system, identify abnormal temperature points and the time of abnormal temperature rise, and obtain abnormal information after identifying the abnormal temperature rise time and abnormal temperature points.

[0106] For example, the BMS can continuously acquire the temperature of each acquisition point in the energy storage system. When the temperature of a certain acquisition point is significantly different from the historical temperature of that acquisition point, the acquisition point is identified as a temperature anomaly point, and the moment when this temperature occurs is taken as the temperature rise anomaly moment.

[0107] The abnormal information includes: abnormal temperature current and abnormal temperature. Specifically, abnormal temperature current refers to the current value collected by the BMS from the abnormal temperature point at the time of abnormal temperature rise, and abnormal temperature refers to the temperature value collected by the BMS from the abnormal temperature point at the time of abnormal temperature rise.

[0108] S403. After the abnormal temperature rise time, collect the temperature of the abnormal point of the energy storage system according to the preset time, and determine the temperature rise change rate of the abnormal point of the energy storage system based on the collected temperature.

[0109] Optionally, after determining the time and point of temperature anomaly, the BMS can collect the temperature of the anomaly point of the energy storage system for a preset duration, and calculate the rate of temperature change at the anomaly point of the energy storage system based on the collected temperature T within the preset duration.

[0110] S404. Based on the system information, anomaly information, temperature rise rate at anomaly points, and ambient temperature of the energy storage system, determine the contact resistance value corresponding to the abnormal battery cluster in the energy storage system.

[0111] It is understandable that after an abnormal temperature occurs in an energy storage system, the contact resistance value corresponding to the abnormal battery cluster can be determined by using the system information, abnormal information, temperature rise rate at the abnormal point, and ambient temperature of the energy storage system. Then, the maximum current that can flow through the abnormal battery cluster at this time can be determined by the contact resistance value, i.e., the maximum allowable current. The temperature at the abnormal point of the energy storage system can then be adjusted by using the maximum allowable current.

[0112] Optionally, after determining the abnormal temperature rise rate of the energy storage system, the contact resistance value corresponding to the abnormal battery cluster in the energy storage system can be calculated based on the system information, abnormal information, abnormal temperature rise rate, and ambient temperature of the energy storage system.

[0113] In this context, an abnormal battery cluster in an energy storage system can be understood as a battery cluster that has become abnormal due to an abnormal temperature point. The contact resistance value corresponding to the abnormal battery cluster can be the contact resistance value of the temperature anomaly point. The contact resistance value characterizes the resistance value of the electrical connection point where the firmware is located at the moment of abnormal temperature rise. For example, the battery cluster where the temperature anomaly point is located, or the closest battery cluster, is considered the abnormal battery cluster.

[0114] S405. Based on the contact resistance value, firmware parameters, ambient temperature, and maximum preset temperature, calculate the maximum allowable current corresponding to the abnormal battery cluster in the energy storage system.

[0115] It is understandable that when an energy storage system experiences a temperature anomaly, adjusting the system's temperature requires meeting the power balance point, i.e., the temperature change rate is 0 and the heat generation power is 0. Therefore, the thermal balance current curve can be used to characterize this condition, and the maximum allowable current corresponding to the abnormal battery cluster can be represented by this curve. Furthermore, the maximum allowable current corresponding to the abnormal battery cluster can be calculated based on the contact resistance value, firmware parameters, ambient temperature, and the maximum preset temperature, thus obtaining the maximum allowable current for the abnormal battery cluster in the energy storage system. The thermal balance current curve refers to the relationship between current and temperature when the temperature anomaly point reaches thermal equilibrium.

[0116] Optionally, after obtaining the contact resistance value, the maximum allowable current corresponding to the abnormal battery cluster in the energy storage system can be calculated based on the contact resistance value, firmware parameters, ambient temperature, and maximum preset temperature.

[0117] Optionally, after obtaining the maximum allowable current corresponding to the abnormal battery cluster, the BMS can control the operation of the abnormal battery cluster with the maximum allowable current corresponding to the abnormal battery cluster, thereby achieving temperature control of the abnormal battery cluster.

[0118] Among them, the maximum allowable current corresponding to the abnormal battery cluster in the energy storage system refers to the maximum current value that the abnormal battery cluster can safely withstand without causing damage or performance degradation to the energy storage system after being affected by the temperature anomaly point.

[0119] In this embodiment, by acquiring the system information, maximum preset temperature, and ambient temperature of the energy storage system, and when an electrical connection point in the energy storage system experiences an abnormal temperature rise, abnormal information of the abnormal temperature point is acquired at the moment of the abnormal temperature rise. Simultaneously, after the abnormal temperature rise moment, the temperature of the abnormal temperature point in the energy storage system is collected for a preset duration, and the rate of temperature change at the abnormal point is determined based on the collected temperature. This allows the contact resistance value corresponding to the abnormal battery cluster in the energy storage system to be determined based on the system information, abnormal information, rate of temperature change at the abnormal point, and ambient temperature. Then, based on the contact resistance value, firmware parameters, ambient temperature, and maximum preset temperature, the maximum allowable current corresponding to the abnormal battery cluster in the energy storage system is calculated. This allows for adjustment of the current of the abnormal battery cluster using the maximum allowable current, enabling temperature control of the abnormal battery cluster without stopping the operation of the energy storage system, thus improving the stability, reliability, and safety of the energy storage system operation.

[0120] Figure 5 This is a flowchart illustrating the process of determining the contact resistance value of an energy storage system in the energy storage system current determination method provided in this application embodiment.

[0121] In one possible implementation, refer to Figure 5 As shown, in step S404 above, when determining the contact resistance value corresponding to the abnormal battery cluster in the energy storage system based on the system information, anomaly information, abnormal point temperature rise rate, and ambient temperature of the energy storage system, the process includes:

[0122] S501. Based on the operating information of the energy storage system and the abnormal temperature current, determine the target abnormal temperature current corresponding to the abnormal battery cluster in the energy storage system.

[0123] It is understandable that since the abnormal temperature current in the energy storage system is affected by the connection method of each cell, the target abnormal temperature current corresponding to the abnormal battery cluster in the energy storage system can be determined based on the operating information of the energy storage system and the abnormal temperature current.

[0124] Optionally, the target temperature anomaly current of the energy storage system can be determined from the connection method of each cell and the temperature anomaly current in the operation information of the energy storage system. The target temperature anomaly current refers to the actual temperature value at the time of the temperature anomaly point in the energy storage system at which the temperature rise is abnormal.

[0125] S502. The contact resistance value is calculated based on the abnormal current at the target temperature, the rate of change of temperature rise at the abnormal point, the firmware parameters of the energy storage system, the abnormal temperature, and the ambient temperature of the energy storage system.

[0126] Optionally, after determining the abnormal current at the target temperature, the contact resistance value corresponding to the abnormal battery cluster in the energy storage system can be calculated based on the abnormal current at the target temperature, the rate of change of temperature rise at the abnormal point, the firmware parameters of the energy storage system, the abnormal temperature, and the ambient temperature of the energy storage system.

[0127] By analyzing the operating information and abnormal temperature current of the energy storage system, the target abnormal temperature current of the energy storage system is determined. Then, by analyzing the target abnormal temperature current, the rate of change of temperature rise at the abnormal point, the firmware parameters of the energy storage system, the abnormal temperature, and the ambient temperature of the energy storage system, the contact resistance value is calculated. This ensures the accuracy of the obtained contact resistance value, thereby improving the stability, reliability, and safety of the energy storage system during operation.

[0128] In one possible implementation, the operating information of the energy storage system includes: the series and parallel connection mode of each cell in the energy storage system, whether each battery cluster in the energy storage system is connected in series with a DC-DC converter, and the number of cells connected in parallel in each battery cluster in the energy storage system.

[0129] Optionally, the series-parallel connection mode of each cell in the energy storage system refers to whether the cells are connected in series or in parallel; whether each battery cluster in the energy storage system is connected in series with DC-DC refers to whether each battery cluster in the energy storage system is connected in series with DC-DC; and the number of cells connected in parallel in each battery cluster in the energy storage system refers to the number of cells connected in parallel when the cells in the energy storage system are in parallel mode.

[0130] Figure 6 This is a flowchart illustrating the process of determining the target temperature anomaly current of an energy storage system in the energy storage system current determination method provided in the embodiments of this application.

[0131] In one possible implementation, refer to Figure 6 As shown, in step S501 above, the target temperature anomaly current corresponding to the abnormal battery cluster in the energy storage system is determined based on the operating information of the energy storage system and the abnormal temperature current, including:

[0132] S601. If the cells in the energy storage system are connected in series, the abnormal temperature current will be used as the target abnormal temperature current corresponding to the abnormal battery cluster in the energy storage system.

[0133] It is understandable that if the cells in the energy storage system are not connected in parallel, then the cells are connected in series, and the abnormal temperature current is numerically the same as the target abnormal temperature current of the energy storage system.

[0134] Optionally, the BMS determines the series and parallel connection mode of each cell in the energy storage system. If each cell in the energy storage system is in series mode, the abnormal temperature current is taken as the target abnormal temperature current corresponding to the abnormal battery cluster in the energy storage system.

[0135] S602. If the cells in the energy storage system are connected in parallel, obtain the temperature anomaly point corresponding to the temperature anomaly current, and determine the target temperature anomaly current corresponding to the abnormal battery cluster in the energy storage system based on the temperature anomaly point and the temperature anomaly current.

[0136] Optionally, if the cells in the energy storage system are connected in parallel, then it can be determined that the cells in the energy storage system are connected in parallel. In this case, it is necessary to obtain the temperature anomaly point corresponding to the temperature anomaly current, and after processing the temperature anomaly point and the temperature anomaly current, obtain the target temperature anomaly current corresponding to the abnormal battery cluster in the energy storage system.

[0137] Among them, the temperature anomaly point is the location where an abnormal temperature current occurs, that is, the location of the temperature sensor that collects the abnormal temperature. In other words, when deploying temperature sensors, the BMS can pre-store the identifier of the temperature sensor and the deployment location of the temperature sensor, so that the temperature anomaly point can be obtained by the temperature sensor that collects the abnormal temperature.

[0138] By judging the operating mode of each cell in the energy storage system, the abnormal current at the target temperature can be determined, ensuring the accuracy of the obtained abnormal current at the target temperature, thereby ensuring the accuracy of the obtained contact resistance value, thus improving the stability, reliability and safety of the energy storage system during operation.

[0139] Figure 7 This is another flowchart illustrating the determination of the target temperature anomaly current of the energy storage system in the energy storage system current determination method provided in the embodiments of this application.

[0140] In one possible implementation, refer to Figure 7 As shown, in step S602 above, when determining the target abnormal temperature current corresponding to the abnormal battery cluster in the energy storage system based on the abnormal temperature location and abnormal temperature current, the following steps are included:

[0141] S701. Determine whether the abnormal temperature point is within the first preset location range. If so, use the abnormal temperature current as the target abnormal temperature current.

[0142] It is understandable that the battery cluster in the energy storage system is composed of multiple battery packs connected in series, each battery pack is composed of multiple modules connected in parallel, each module is composed of multiple cells connected in series, and the temperature sensor is located inside the battery pack. Therefore, the abnormal temperature point may be located at the position corresponding to the total current of the battery cluster, or it may not be located at the position corresponding to the total current of the battery cluster. Therefore, it is necessary to determine the location of the abnormal temperature point.

[0143] Optionally, if the temperature anomaly point is within a first preset location range, the temperature anomaly current can be determined as the total current of the abnormal battery cluster, and the temperature anomaly current can be used as the target temperature anomaly current. The first preset location range includes: outside the parallel module of the battery pack or at the positive and negative terminals of the battery pack.

[0144] S702. If not, multiply the abnormal temperature current by the number of cells connected in parallel in the abnormal battery cluster to obtain the target abnormal temperature current.

[0145] Optionally, if the abnormal temperature point is not within the first preset location range, it can be determined that the abnormal temperature current is not the total current of the abnormal battery cluster, but the current of a certain cell. Then, the abnormal temperature current is multiplied by the number of cells in parallel in the abnormal battery cluster to obtain the target abnormal temperature current.

[0146] By determining whether the abnormal temperature point is within the first preset location range, the target abnormal temperature current can be determined, thus ensuring the accuracy of the obtained target abnormal temperature current.

[0147] In one possible implementation, S502 calculates the contact resistance value based on the target temperature abnormal current, the abnormal point temperature rise rate, the firmware parameters of the energy storage system, the abnormal temperature, and the ambient temperature of the energy storage system, including:

[0148] The contact resistance value is obtained by inputting the target temperature abnormal current, the abnormal point temperature rise rate, the firmware parameters of the energy storage system, the abnormal temperature, and the ambient temperature of the energy storage system into a pre-constructed temperature change rate equation.

[0149] Optionally, a pre-constructed temperature change rate equation, i.e., the rate of temperature rise at the anomaly point of the energy storage system. It can be represented by the following formula (3):

[0150]

[0151] Where T is the abnormal temperature, T amb Where is the ambient temperature, I is the abnormal temperature current, λ is the heat dissipation power coefficient, R is the contact resistance value, and C is the temperature. p ρ is the specific heat capacity of the copper conductor, and m is the mass of the copper.

[0152] Alternatively, based on the above formula (3), the contact resistance value R can be obtained as shown in the following formula (4):

[0153]

[0154] Where T is the abnormal temperature, T amb Let I be the ambient temperature, λ be the abnormal temperature current, and C be the heat dissipation power coefficient. p ρ is the specific heat capacity of the copper conductor, and m is the mass of the copper.

[0155] Optionally, the abnormal current at the target temperature, the rate of change of temperature rise at the abnormal point, the firmware parameters of the energy storage system, the abnormal temperature, and the ambient temperature of the energy storage system are input into the above formula (3) or (4) to solve for the contact resistance value R.

[0156] In one possible implementation, S405 above calculates the maximum allowable current corresponding to the abnormal battery cluster in the energy storage system based on the contact resistance value, firmware parameters, ambient temperature, and maximum preset temperature, including:

[0157] By inputting the contact resistance value, firmware parameters, ambient temperature, and maximum preset temperature into a pre-constructed current equation, the maximum allowable current corresponding to the abnormal battery cluster in the energy storage system can be obtained by solving the equation.

[0158] It is understandable that when the temperature of the energy storage system is abnormal, the temperature adjustment of the energy storage system needs to meet the power balance point, that is, the temperature change rate is 0 and the heat generation power is 0, that is, it needs to meet the following formula (5):

[0159] I 2 R-λ(TT amb )=0 (5)

[0160] Where T is the abnormal temperature, T amb Where is the ambient temperature, I is the abnormal temperature current, λ is the heat dissipation power coefficient, and R is the contact resistance value.

[0161] Therefore, the thermal equilibrium current value curve can be obtained as shown in the following formula (6):

[0162]

[0163] Where T is the abnormal temperature, T amb Where is the ambient temperature, I is the abnormal temperature current, λ is the heat dissipation power coefficient, and R is the contact resistance value.

[0164] Therefore, the current equation can be obtained as shown in formula (7):

[0165]

[0166] Where T is the abnormal temperature, T amb Where is the ambient temperature, I is the abnormal temperature current, λ is the heat dissipation power coefficient, and R is the contact resistance value.

[0167] Optionally, the contact resistance value R, heat dissipation power coefficient λ, and ambient temperature T are included. amb and the maximum preset temperature T set By inputting a pre-constructed current equation, the maximum allowable current corresponding to the abnormal battery cluster in the energy storage system can be obtained by solving the equation.

[0168] The above provides an exemplary description of the process for determining the maximum allowable current corresponding to an abnormal battery cluster in an energy storage system. It can be understood that after determining the maximum allowable current corresponding to an abnormal battery cluster in the energy storage system, the maximum allowable current of the energy storage system at this time can also be determined. The following provides an exemplary description.

[0169] In one possible implementation, the energy storage system current determination method provided in this application embodiment further includes:

[0170] The maximum allowable current of the energy storage system is determined based on the operating information of the energy storage system and the maximum allowable current corresponding to the abnormal battery clusters in the energy storage system.

[0171] Optionally, the maximum allowable current of the energy storage system can be calculated based on the maximum allowable current of each battery cluster (excluding abnormal battery clusters) in the energy storage system's operating information and the maximum allowable current corresponding to the abnormal battery clusters in the energy storage system.

[0172] The maximum allowable current of the energy storage system refers to the maximum current value that each battery cluster in the energy storage system can safely withstand without causing damage or performance degradation after the occurrence of this temperature anomaly.

[0173] By using the operating information of the energy storage system and the maximum allowable current corresponding to abnormal battery clusters in the energy storage system, the maximum allowable current of the energy storage system can be determined. This ensures the comprehensiveness of the obtained maximum allowable current of the energy storage system, thereby improving the stability and reliability of the energy storage system.

[0174] Figure 8 This is a flowchart illustrating the process of determining the maximum allowable current of an energy storage system in the energy storage system current determination method provided in this application embodiment.

[0175] In one possible implementation, refer to Figure 8 As shown, the above steps, when determining the maximum allowable current of the energy storage system based on the operating information of the energy storage system and the maximum allowable current corresponding to the abnormal battery clusters in the energy storage system, include:

[0176] S801. Determine the maximum allowable current for other battery clusters in the energy storage system.

[0177] Optionally, the BMS can determine the maximum allowable current of all battery clusters in the energy storage system, excluding the abnormal battery clusters, from the acquired operating information of the energy storage system. Here, "other battery clusters" refers to all battery clusters in the energy storage system other than the abnormal battery clusters.

[0178] S802. Determine the maximum allowable current of the energy storage system based on the operating information of the energy storage system, the maximum allowable current of other battery clusters in the energy storage system, and the maximum allowable current corresponding to the abnormal battery clusters in the energy storage system.

[0179] Optionally, after obtaining the maximum allowable current of each battery cluster in the energy storage system, since whether each battery cluster in the energy storage system is connected in series with a DC-DC converter will affect the maximum allowable current of the energy storage system, the maximum allowable current of the energy storage system can be calculated based on whether each battery cluster is connected in series with a DC-DC converter in the energy storage system's operation information, and based on the maximum allowable current of other battery clusters in the energy storage system and the maximum allowable current corresponding to abnormal battery clusters in the energy storage system.

[0180] By determining the maximum allowable current of other battery clusters in the energy storage system, and using the operating information of the energy storage system, the maximum allowable current of other battery clusters in the energy storage system, and the maximum allowable current corresponding to abnormal battery clusters in the energy storage system, the maximum allowable current of the energy storage system is determined. This ensures that the obtained maximum allowable current of the energy storage system not only considers the maximum allowable current corresponding to abnormal battery clusters in the energy storage system, but also considers the maximum allowable current of other battery clusters in the energy storage system, thus guaranteeing the comprehensiveness and reliability of the obtained maximum allowable current of the energy storage system.

[0181] In one possible implementation, the determination of the maximum allowable current of the energy storage system in step S802, based on the operating information of the energy storage system, the maximum allowable current of other battery clusters in the energy storage system, and the maximum allowable current corresponding to the abnormal battery clusters in the energy storage system, includes:

[0182] If there are series-connected DC-DC converters in each battery cluster of the energy storage system, the sum of the maximum allowable current of other battery clusters in the energy storage system and the maximum allowable current of the abnormal battery cluster in the energy storage system is calculated, and the result is taken as the maximum allowable current of the energy storage system.

[0183] Optionally, the BMS determines whether each battery cluster in the energy storage system is connected in series with a DC-DC converter based on the operating information of the energy storage system. If each battery cluster in the energy storage system is connected in series with a DC-DC converter, the maximum allowable current of other battery clusters in the energy storage system and the maximum allowable current corresponding to the abnormal battery cluster in the energy storage system are summed, and the result is used as the maximum allowable current of the energy storage system.

[0184] When there are series DC-DC converters in each battery cluster of an energy storage system, the maximum allowable current of other battery clusters in the energy storage system and the sum of the maximum allowable current of the abnormal battery clusters in the energy storage system are calculated. The result is used as the maximum allowable current of the energy storage system. This can ensure that the energy storage system will not overload due to excessive current during operation, thus improving the stability and reliability of the energy storage system.

[0185] In one possible implementation, the determination of the maximum allowable current of the energy storage system in step S802, based on the operating information of the energy storage system, the maximum allowable current of other battery clusters in the energy storage system, and the maximum allowable current corresponding to the abnormal battery clusters in the energy storage system, includes:

[0186] If there is no series-connected DC-DC converter in each battery cluster of the energy storage system, then determine the minimum value of the maximum allowable current of the other battery clusters in the energy storage system and the minimum value of the maximum allowable current of the abnormal battery cluster in the energy storage system. Calculate the product of the minimum value and the number of battery clusters in the energy storage system, and use the result as the maximum allowable current of the energy storage system.

[0187] Optionally, the BMS determines whether each battery cluster in the energy storage system is connected in series with a DC-DC converter based on the operating information of the energy storage system. If there is no DC-DC converter connected in series in each battery cluster of the energy storage system, the maximum allowable current of other battery clusters in the energy storage system and the maximum allowable current of the abnormal battery cluster in the energy storage system are sorted, and the minimum value of the maximum allowable current of other battery clusters in the energy storage system and the maximum allowable current of the abnormal battery cluster in the energy storage system is determined. The product of the minimum value and the number of battery clusters in the energy storage system is calculated, and the result is taken as the maximum allowable current of the energy storage system.

[0188] When there is no series DC-DC converter in each battery cluster of the energy storage system, the minimum value of the maximum allowable current of the other battery clusters in the energy storage system and the minimum value of the maximum allowable current of the abnormal battery cluster in the energy storage system is determined, and the product of the minimum value and the number of battery clusters in the energy storage system is calculated as the maximum allowable current of the energy storage system. This can ensure that the energy storage system will not overload due to excessive current during operation, thus improving the stability and reliability of the energy storage system.

[0189] Based on the same inventive concept, this application also provides an energy storage system current determination device corresponding to the energy storage system current determination method. Since the principle of the device in this application is similar to the energy storage system current determination method described above in this application, the implementation of the device can refer to the implementation of the method, and the repeated parts will not be described again.

[0190] Figure 9A schematic diagram of an energy storage system current determination device provided in an embodiment of this application is shown below. Figure 9 As shown, the device includes: a first acquisition module 901, a second acquisition module 902, a collection module 903, a first determination module 904, and a second determination module 905; wherein,

[0191] The first acquisition module 901 is used to acquire the system information of the energy storage system, the maximum preset temperature of the energy storage system, and the ambient temperature of the energy storage system. The system information includes the operating information of the energy storage system and the firmware parameters of the energy storage system.

[0192] The second acquisition module 902 is used to acquire the abnormal information of the temperature abnormal point at the time of abnormal temperature rise. The abnormal information includes: abnormal temperature current and abnormal temperature.

[0193] The data acquisition module 903 is used to acquire the temperature of the abnormal point of the energy storage system after the abnormal temperature rise time according to a preset time, and to determine the temperature rise change rate of the abnormal point of the energy storage system based on the acquired temperature.

[0194] The first determining module 904 is used to determine the contact resistance value corresponding to the abnormal battery cluster in the energy storage system based on the system information, abnormal information, abnormal point temperature rise rate and ambient temperature of the energy storage system.

[0195] The second determining module 905 is used to calculate the maximum allowable current corresponding to the abnormal battery cluster in the energy storage system based on the contact resistance value, firmware parameters, ambient temperature and maximum preset temperature.

[0196] In one possible implementation, the first determining module 904 is specifically used for:

[0197] Based on the operating information of the energy storage system and the abnormal temperature current, determine the target abnormal temperature current corresponding to the abnormal battery cluster in the energy storage system.

[0198] The contact resistance value is calculated based on the abnormal current at the target temperature, the rate of change of temperature rise at the abnormal point, the firmware parameters of the energy storage system, the abnormal temperature, and the ambient temperature of the energy storage system.

[0199] In one possible implementation, the operating information of the energy storage system includes: the series-parallel connection mode of each cell in the energy storage system, whether each battery cluster in the energy storage system has a series DC-DC converter, and the number of cells connected in parallel in each battery cluster in the energy storage system; the first determining module 904 is specifically used for:

[0200] If the cells in the energy storage system are connected in series, then the abnormal temperature current will be used as the target abnormal temperature current corresponding to the abnormal battery cluster in the energy storage system.

[0201] If the cells in the energy storage system are connected in parallel, the abnormal temperature point corresponding to the abnormal temperature current is obtained, and the target abnormal temperature current corresponding to the abnormal battery cluster in the energy storage system is determined based on the abnormal temperature point and the abnormal temperature current.

[0202] In one possible implementation, the first determining module 904 is specifically used for:

[0203] Determine whether the temperature anomaly point is within the first preset location range. If so, use the temperature anomaly current as the target temperature anomaly current.

[0204] If not, multiply the abnormal temperature current by the number of cells connected in parallel in the abnormal battery cluster to obtain the target abnormal temperature current.

[0205] In one possible implementation, the first determining module 904 is specifically used for:

[0206] The contact resistance value is obtained by inputting the target temperature abnormal current, the abnormal point temperature rise rate, the firmware parameters of the energy storage system, the abnormal temperature, and the ambient temperature of the energy storage system into a pre-constructed temperature change rate equation.

[0207] In one possible implementation, the second determining module 905 is specifically used for:

[0208] By inputting the contact resistance value, firmware parameters, ambient temperature, and maximum preset temperature into a pre-constructed current equation, the maximum allowable current corresponding to the abnormal battery cluster in the energy storage system can be obtained by solving the equation.

[0209] In one possible implementation, the apparatus further includes: a third determining module, configured to:

[0210] The maximum allowable current of the energy storage system is determined based on the operating information of the energy storage system and the maximum allowable current corresponding to the abnormal battery clusters in the energy storage system.

[0211] In one possible implementation, the third determining module is specifically used for:

[0212] Determine the maximum allowable current for other battery clusters in the energy storage system;

[0213] The maximum allowable current of the energy storage system is determined based on the operating information of the energy storage system, the maximum allowable current of other battery clusters in the energy storage system, and the maximum allowable current of abnormal battery clusters in the energy storage system.

[0214] In one possible implementation, the third determining module is specifically used for:

[0215] If each battery cluster in the energy storage system contains a series DC-DC converter, then calculate the sum of the maximum allowable current of other battery clusters in the energy storage system and the maximum allowable current of the abnormal battery cluster in the energy storage system, and use the result as the maximum allowable current of the energy storage system.

[0216] In one possible implementation, the third determining module is specifically used for:

[0217] If there is no series DC-DC converter in each battery cluster of the energy storage system, then determine the minimum value of the maximum allowable current of the other battery clusters in the energy storage system and the minimum value of the maximum allowable current of the abnormal battery cluster in the energy storage system. Calculate the product of the minimum value and the number of parallel battery clusters in the energy storage system, and use the result as the maximum allowable current of the energy storage system.

[0218] The processing flow of each module in the device and the interaction flow between each module can be referred to the relevant descriptions in the above method embodiments, and will not be detailed here.

[0219] This application also provides an electronic device 1000, such as... Figure 10 As shown, Figure 10 A schematic diagram of the structure of an electronic device provided in this application embodiment includes: a processor 1001, a memory 1002, and optionally, a bus 1003. The memory 1002 stores machine-readable instructions executable by the processor 1001 (e.g., ...). Figure 9 The device includes the execution instructions corresponding to the first acquisition module 901, the second acquisition module 902, the acquisition module 903, the first determination module 904, and the second determination module 905. When the electronic device 1000 is running, the processor 1001 and the memory 1002 communicate through the bus 1003. When the machine-readable instructions are executed by the processor 1001, the steps of the above-mentioned energy storage system current determination method are performed.

[0220] This application also provides a computer-readable storage medium storing a computer program, which, when executed by a processor, performs the steps of the above-described energy storage system current determination method.

[0221] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems and devices described above can be referred to the corresponding processes in the method embodiments, and will not be repeated here. In the several embodiments provided in this application, it should be understood that the disclosed systems, devices, and methods can be implemented in other ways. The device embodiments described above are merely illustrative. For example, the division of modules is only a logical functional division, and in actual implementation, there may be other division methods. Furthermore, multiple modules or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed mutual coupling or direct coupling or communication connection can be through some communication interfaces; the indirect coupling or communication connection of devices or modules can be electrical, mechanical, or other forms.

[0222] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. If the functions are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this invention, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0223] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application.

Claims

1. A method for determining the current of an energy storage system, characterized in that, include: The system information of the energy storage system, the maximum preset temperature of the energy storage system, and the ambient temperature of the energy storage system are obtained. The system information includes the operating information of the energy storage system and the firmware parameters of the energy storage system. Obtain abnormal information of the temperature anomaly point at the time of abnormal temperature rise, the abnormal information including: abnormal temperature current and abnormal temperature; After the abnormal temperature rise time, the temperature of the abnormal point of the energy storage system is collected for a preset time period, and the temperature rise rate of the abnormal point of the energy storage system is determined based on the collected temperature. Based on the system information of the energy storage system, the anomaly information, the temperature rise rate of the anomaly point, and the ambient temperature of the energy storage system, determine the contact resistance value corresponding to the abnormal battery cluster in the energy storage system. Based on the contact resistance value, the firmware parameters, the ambient temperature, and the maximum preset temperature, the maximum allowable current corresponding to the abnormal battery cluster in the energy storage system is calculated.

2. The method for determining the current of an energy storage system according to claim 1, characterized in that, The step of determining the contact resistance value corresponding to the abnormal battery cluster in the energy storage system based on the system information of the energy storage system, the anomaly information, the rate of temperature rise change at the anomaly point, and the ambient temperature of the energy storage system includes: Based on the operating information of the energy storage system and the abnormal temperature current, determine the target abnormal temperature current corresponding to the abnormal battery cluster in the energy storage system. The contact resistance value is calculated based on the abnormal current at the target temperature, the rate of change of temperature rise at the abnormal point, the firmware parameters of the energy storage system, the abnormal temperature, and the ambient temperature of the energy storage system.

3. The method for determining the current of an energy storage system according to claim 2, characterized in that, The operating information of the energy storage system includes: the series and parallel connection mode of each cell in the energy storage system, whether each battery cluster in the energy storage system is connected in series with a DC-DC converter, and the number of cells connected in parallel in each battery cluster in the energy storage system. The step of determining the target abnormal temperature current corresponding to the abnormal battery cluster in the energy storage system based on the operating information of the energy storage system and the abnormal temperature current includes: If the cells in the energy storage system are connected in series, then the abnormal temperature current is taken as the target abnormal temperature current corresponding to the abnormal battery cluster in the energy storage system. If the cells in the energy storage system are connected in parallel, the abnormal temperature point corresponding to the abnormal temperature current is obtained, and the target abnormal temperature current corresponding to the abnormal battery cluster in the energy storage system is determined based on the abnormal temperature point and the abnormal temperature current.

4. The method for determining the current of an energy storage system according to claim 3, characterized in that, The step of determining the target abnormal temperature current corresponding to the abnormal battery cluster in the energy storage system based on the abnormal temperature location and the abnormal temperature current includes: Determine whether the temperature anomaly point is within the first preset location range; if so, then use the temperature anomaly current as the target temperature anomaly current. If not, the abnormal temperature current is multiplied by the number of cells connected in parallel in the abnormal battery cluster to obtain the target abnormal temperature current.

5. The method for determining the current of an energy storage system according to claim 2, characterized in that, The step of calculating the contact resistance value based on the abnormal current at the target temperature, the rate of change of temperature rise at the abnormal point, the firmware parameters of the energy storage system, the abnormal temperature, and the ambient temperature of the energy storage system includes: The contact resistance value is obtained by inputting the target temperature abnormal current, the abnormal point temperature rise rate, the firmware parameters of the energy storage system, the abnormal temperature, and the ambient temperature of the energy storage system into a pre-constructed temperature change rate equation.

6. The method for determining the current of an energy storage system according to claim 1, characterized in that, The step of calculating the maximum allowable current corresponding to the abnormal battery cluster in the energy storage system based on the contact resistance value, the firmware parameters, the ambient temperature, and the maximum preset temperature includes: The contact resistance value, firmware parameters, ambient temperature, and maximum preset temperature are input into a pre-constructed current equation to solve for the maximum allowable current corresponding to the abnormal battery cluster in the energy storage system.

7. The method for determining the current of an energy storage system according to claim 3, characterized in that, The method further includes: The maximum allowable current of the energy storage system is determined based on the operating information of the energy storage system and the maximum allowable current corresponding to the abnormal battery clusters in the energy storage system.

8. The method for determining the current of an energy storage system according to claim 7, characterized in that, The step of determining the maximum allowable current of the energy storage system based on the operating information of the energy storage system and the maximum allowable current corresponding to the abnormal battery clusters in the energy storage system includes: Determine the maximum allowable current for other battery clusters in the energy storage system; The maximum allowable current of the energy storage system is determined based on the operating information of the energy storage system, the maximum allowable current of other battery clusters in the energy storage system, and the maximum allowable current corresponding to the abnormal battery clusters in the energy storage system.

9. The method for determining the current of an energy storage system according to claim 8, characterized in that, The step of determining the maximum allowable current of the energy storage system based on the operating information of the energy storage system, the maximum allowable current of other battery clusters in the energy storage system, and the maximum allowable current corresponding to the abnormal battery clusters in the energy storage system includes: If each battery cluster in the energy storage system contains a series DC-DC converter, the maximum allowable current of other battery clusters in the energy storage system and the sum of the maximum allowable current of the abnormal battery cluster in the energy storage system are calculated, and the result is taken as the maximum allowable current of the energy storage system.

10. The method for determining the current of an energy storage system according to claim 8, characterized in that, The step of determining the maximum allowable current of the energy storage system based on the operating information of the energy storage system, the maximum allowable current of other battery clusters in the energy storage system, and the maximum allowable current corresponding to the abnormal battery clusters in the energy storage system includes: If there is no series DC-DC converter in each battery cluster of the energy storage system, then determine the minimum value of the maximum allowable current of the other battery clusters in the energy storage system and the minimum value of the maximum allowable current of the abnormal battery cluster in the energy storage system, and calculate the product of the minimum value and the number of parallel battery clusters in the energy storage system. The result is taken as the maximum allowable current of the energy storage system.

11. A current determination device for an energy storage system, characterized in that, include: The first acquisition module is used to acquire system information of the energy storage system, the maximum preset temperature of the energy storage system, and the ambient temperature of the energy storage system. The system information includes the operating information of the energy storage system and the firmware parameters of the energy storage system. The second acquisition module is used to acquire abnormal information of the temperature abnormal point at the time of abnormal temperature rise. The abnormal information includes: abnormal temperature current and abnormal temperature. The data acquisition module is used to acquire the temperature of the abnormal temperature point of the energy storage system after the abnormal temperature rise time, according to a preset time interval, and to determine the rate of change of the abnormal temperature point of the energy storage system based on the acquired temperature. The first determining module is used to determine the contact resistance value corresponding to the abnormal battery cluster in the energy storage system based on the system information of the energy storage system, the abnormal information, the temperature rise change rate of the abnormal point, and the ambient temperature of the energy storage system. The second determining module is used to calculate the maximum allowable current corresponding to the abnormal battery cluster in the energy storage system based on the contact resistance value, the firmware parameters, the ambient temperature, and the maximum preset temperature.

12. An electronic device, characterized in that, include: The device includes a processor and a memory, the memory storing machine-readable instructions executable by the processor, which, when the electronic device is in operation, are executed by the processor to perform the steps of the energy storage system current determination method as described in any one of claims 1 to 10.

13. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program that, when executed by a processor, performs the steps of the energy storage system current determination method as described in any one of claims 1 to 10.

Images