Thermal management method, device and energy storage system for energy storage system

Abstract

The present application relates to a thermal management method, device and energy storage system for an energy storage system. The method comprises: obtaining temperature information and operating status information of each battery cluster in the energy storage system; determining the first candidate management mode of the thermal management component in the energy storage system relative to all battery clusters based on the temperature information, and determining the second candidate management mode of all online battery clusters based on the temperature information and operating status information; when the first candidate management mode is the same as the second candidate management mode, determining the first candidate management mode as the target thermal management mode; controlling the operation of the thermal management component according to the target thermal management mode, performing thermal management on the energy storage system, and obtaining the newly added request management mode of the newly added battery cluster when there is a newly added battery cluster in the energy storage system; determining the target thermal management mode of the energy storage system based on the newly added request management mode and the current thermal management mode of the energy storage system. The use of this method can improve the operational stability and safety of the energy storage system.

Description

Technical Field

[0001] The present application relates to the field of energy storage technology, and in particular to a thermal management method, device, computer equipment, storage medium, computer program product and energy storage system for an energy storage system. Background Art

[0002] With the large-scale development and utilization of renewable energy and the transformation of power structure, energy storage systems play an increasingly important role in power systems. Energy storage systems, such as string energy storage systems, as an efficient and flexible energy storage solution, can meet the energy storage needs in different application scenarios, such as grid peak regulation, new energy grid connection, microgrids, electric vehicle charging piles, home energy storage, etc.

[0003] The energy storage system will generate a large amount of heat during the charging and discharging process. If this heat cannot be effectively dissipated, it may cause the internal temperature of the battery to rise sharply, and then cause thermal runaway, affecting the safe and stable operation of the energy storage system. Since the performance and operating stability of the energy storage system are closely related to the thermal management method of the energy storage system, how to reasonably manage the thermal management of the energy storage system is an issue that needs to be urgently resolved in order to improve the operating stability and safety of the energy storage system. Summary of the invention

[0004] Based on this, it is necessary to provide a thermal management method, device, computer equipment, computer-readable storage medium, computer program product and energy storage system for the energy storage system, which can improve the operating stability and safety of the energy storage system in response to the above technical problems.

[0005] In a first aspect, the present application provides a thermal management method for an energy storage system, the method comprising:

[0006] Obtain temperature information and operating status information of each battery cluster in the energy storage system;

[0007] determining a first candidate management mode of the thermal management component in the energy storage system relative to all battery clusters based on the temperature information, and determining a second candidate management mode of the thermal management component relative to all online battery clusters based on the temperature information and the operating status information;

[0008] In a case where the first candidate management mode is the same as the second candidate management mode, determining the first candidate management mode as a target thermal management mode;

[0009] Controlling the operation of the thermal management component according to the target thermal management mode to perform thermal management on the energy storage system;

[0010] In the case where a new battery cluster exists in the energy storage system, obtaining a new request management mode of the new battery cluster;

[0011] Based on the newly added requested management mode and the current thermal management mode of the energy storage system, a target thermal management mode of the energy storage system is determined.

[0012] In the above embodiment, the controller can obtain the temperature information and operating status information of each battery cluster in the energy storage system, and determine the first candidate management mode of the thermal management component in the energy storage system equivalent to all battery clusters and the second candidate management mode of the thermal management component relative to all online battery clusters through the current temperature conditions of each battery cluster reflected by the temperature information and the current operating status of each battery cluster reflected by the operating status information. When the first candidate management mode is the same as the second candidate management mode, the first candidate management mode is determined as the target thermal management mode, so that the target thermal management mode finally determined fully considers the operating conditions of each battery cluster in the energy storage system, especially the operating conditions of the online battery clusters, and is more in line with the actual operating conditions of the current energy storage system. Subsequently, the operation of the thermal management component in the energy storage system is controlled according to the target thermal management mode, and the energy storage system is thermally managed, which can effectively improve the operating stability and safety of the energy storage system. At the same time, when there is a new battery cluster in the energy storage system, by determining whether there is a large temperature difference between the new battery cluster and other online battery clusters based on the new request management mode of the new battery cluster and the current thermal management mode of the energy storage system, and then determining the target thermal management mode of the energy storage system, it can effectively reduce the probability of confirmation errors in the target thermal management mode due to the large temperature difference between the new battery cluster and other online battery clusters, thereby improving the confirmation accuracy of the target thermal management mode.

[0013] In some embodiments, determining a first candidate management mode of the thermal management component in the energy storage system relative to all battery clusters based on the temperature information, and determining a second candidate management mode of the thermal management component relative to all online battery clusters based on the temperature information and the operating status information, includes:

[0014] extracting the temperature information and the operating status information respectively to determine the battery cluster temperature and operating status of each of the battery clusters;

[0015] Determining, according to the temperatures of all battery clusters, a first candidate management mode of the thermal management component in the energy storage system relative to all battery clusters;

[0016] A second candidate management mode of the thermal management component relative to all online battery clusters is determined based on the battery cluster temperature and the operating state of each of the battery clusters.

[0017] In the above embodiment, by extracting temperature information and operating status information, the battery cluster temperature and operating status of each battery cluster can be accurately obtained from the information data, and then based on all battery cluster temperatures, a first candidate management mode that takes into account the operating conditions of all battery clusters in the energy storage system and a second candidate management mode that takes into account the operating conditions of all online battery clusters in the energy storage system can be determined, thereby improving the accuracy of determining the first candidate management mode and the second candidate management mode, and providing a data basis for the subsequent determination of an accurate target thermal management mode.

[0018] In some embodiments, determining the first candidate management mode of the thermal management component in the energy storage system relative to all battery clusters according to the temperatures of all battery clusters includes:

[0019] Sort all battery cluster temperatures to determine the overall highest battery cluster temperature and the overall lowest battery cluster temperature;

[0020] Invoke the mode activation conditions of each preset thermal management mode to match the conditions with the overall maximum battery cluster temperature and the overall minimum battery cluster temperature respectively;

[0021] The preset thermal management mode corresponding to the successfully matched mode activation condition is determined as the first candidate management mode of the thermal management component in the energy storage system relative to all battery clusters.

[0022] In the above embodiment, the overall maximum battery cluster temperature and the overall minimum battery cluster temperature are determined from all battery cluster temperatures, and the overall maximum battery cluster temperature and the overall minimum battery cluster temperature are conditionally matched with the mode activation conditions of each preset thermal management mode to determine the first candidate management mode. When determining the first candidate management mode, the judgment error that may be caused by the battery temperature difference can be effectively reduced, the accuracy of the first candidate management mode can be improved, and a data basis can be provided for the subsequent determination of the final target thermal management mode.

[0023] In some embodiments, determining the second candidate management mode of the thermal management component relative to all online battery clusters based on the battery cluster temperature and the operating state of each of the battery clusters includes:

[0024] Determining at least two online battery clusters among the battery clusters based on respective operating states of the battery clusters;

[0025] Sorting the online battery cluster temperatures of the online battery clusters to determine the highest online battery cluster temperature and the lowest online battery cluster temperature;

[0026] Calling respective mode start conditions of each preset thermal management mode to match the conditions with the online maximum battery cluster temperature and the online minimum battery cluster temperature respectively;

[0027] The preset thermal management mode corresponding to the successfully matched mode start condition is determined as the second candidate management mode of the thermal management component relative to all online battery clusters.

[0028] In the above embodiment, the highest online battery cluster temperature and the lowest online battery cluster temperature are determined from all online battery cluster temperatures, and the highest online battery cluster temperature and the lowest online battery cluster temperature are conditionally matched with the mode start-up conditions of each preset thermal management mode to determine the second candidate management mode. When determining the second candidate management mode, the judgment error that may be caused by the battery temperature difference can be effectively reduced, the accuracy of the second candidate management mode can be improved, and a data basis can be provided for the subsequent determination of the final target thermal management mode.

[0029] In some embodiments, the method further comprises:

[0030] In a case where the first candidate management mode is different from the second candidate management mode, determining at least two online battery clusters in each of the battery clusters;

[0031] For each of the online battery clusters, obtaining cell temperature information of each battery cell in the online battery cluster;

[0032] determining a requested management mode of the thermal management component relative to the online battery cluster based on the cell temperature information;

[0033] When the requested management modes corresponding to the online battery clusters are the same, the requested management mode is determined as the target thermal management mode.

[0034] In the above embodiment, when the first candidate management mode does not conform to the actual operation of the current energy storage system, the controller can further determine the request management mode corresponding to each online battery cluster, and when the request management modes corresponding to each online battery cluster are consistent, the request management mode is determined as the target thermal management mode, so that the finally determined target thermal management mode is more in line with the overall operation of the online battery clusters of the energy storage system, providing a data basis for the subsequent safe and stable operation of the energy storage system.

[0035] In some embodiments, the method further comprises:

[0036] In the case that the request management modes are different, determining the target request management mode with the largest number from among the request management modes;

[0037] The target requested management mode is determined as the target thermal management mode.

[0038] In the above embodiment, when the request management modes are different, by determining the request management mode with the largest number as the target thermal management mode, the target thermal management mode finally determined can be most closely aligned with the overall operation of the online battery cluster in the energy storage system, thereby providing a data basis for the subsequent safe and stable operation of the energy storage system.

[0039] In some embodiments, determining a target thermal management mode of the energy storage system based on the newly added management mode and the current thermal management mode of the energy storage system includes:

[0040] In a case where the newly added requested management mode matches the current thermal management mode of the energy storage system, the current thermal management mode is determined as the target thermal management mode of the energy storage system.

[0041] In the above embodiment, by matching the newly added request management mode with the current thermal management mode of the energy storage system, it is possible to quickly determine whether the current thermal management mode conforms to the actual operation of the energy storage system after the addition of the battery cluster. When it is determined that the current thermal management mode is still an accurate thermal management mode, the controller can directly determine the current thermal management mode as the target thermal management mode of the energy storage system, thereby reducing the probability of confirmation errors in the target thermal management mode due to the large temperature difference between the newly added battery cluster and other online battery clusters, and also improving the confirmation efficiency of the target thermal management mode.

[0042] In some embodiments, the method further comprises:

[0043] When the newly added request management mode does not match the current thermal management mode of the energy storage system, controlling the operation of the thermal management component according to the temperature difference adjustment thermal management mode;

[0044] When the operation time of the thermal management component reaches a preset time, the newly added battery cluster is determined as an online battery cluster, and the process returns to the step of obtaining temperature information and operation status information of each battery cluster in the energy storage system.

[0045] In the above embodiment, when the newly added requested management mode does not match the current thermal management mode of the energy storage system, by adjusting the temperature difference of the newly added battery cluster and re-determining the target thermal management mode for the energy storage system that meets the actual operation of the current energy storage system after the adjustment is completed, the probability of confirmation error of the target thermal management mode due to the temperature difference can be reduced, thereby improving the confirmation accuracy of the target thermal management mode.

[0046] In a second aspect, the present application further provides a thermal management device for an energy storage system, the device comprising:

[0047] An information acquisition module is used to obtain temperature information and operating status information of each battery cluster in the energy storage system;

[0048] a candidate management mode determination module, configured to determine a first candidate management mode of the thermal management component in the energy storage system relative to all battery clusters based on the temperature information, and to determine a second candidate management mode of the thermal management component relative to all online battery clusters based on the temperature information and the operating state information;

[0049] a target thermal management mode determining module, configured to determine the first candidate management mode as a target thermal management mode when the first candidate management mode is the same as the second candidate management mode;

[0050] A thermal management control module, used to control the operation of the thermal management component according to the target thermal management mode, and perform thermal management on the energy storage system;

[0051] A new request management mode determination module, used for obtaining a new request management mode of a new battery cluster when a new battery cluster exists in the energy storage system;

[0052] The target thermal management mode determination module is further configured to determine a target thermal management mode of the energy storage system based on the newly added requested management mode and the current thermal management mode of the energy storage system.

[0053] In a third aspect, the present application further provides a computer device, including a memory and a processor, wherein the memory stores a computer program, and the processor implements the steps of the above method when executing the computer program.

[0054] In a fourth aspect, the present application further provides a computer-readable storage medium having a computer program stored thereon, wherein the computer program implements the steps of the above method when executed by a processor.

[0055] In a fifth aspect, the present application also provides a computer program product, including a computer program, which implements the steps of the above method when executed by a processor.

[0056] In a sixth aspect, the present application further provides an energy storage system, the energy storage system comprising a plurality of battery clusters, a thermal management component and a controller, the controller being used to implement the thermal management method of the energy storage system as described above.

[0057] The thermal management method, device, computer equipment, storage medium, computer program product and energy storage system of the energy storage system can obtain the temperature information and operating status information of each battery cluster in the energy storage system, and determine the first candidate management mode of the thermal management component in the energy storage system equivalent to all battery clusters and the second candidate management mode of the thermal management component relative to all online battery clusters through the current temperature of each battery cluster reflected by the temperature information and the current operating status of each battery cluster reflected by the operating status information. When the first candidate management mode is the same as the second candidate management mode, the first candidate management mode is determined as the target thermal management mode, so that the target thermal management mode finally determined fully considers the operating conditions of each battery cluster in the energy storage system, especially the operating conditions of the online battery clusters, and is more in line with the actual operating conditions of the current energy storage system. Subsequently, the operation of the thermal management component in the energy storage system is controlled according to the target thermal management mode, and the energy storage system is thermally managed, which can effectively improve the operating stability and safety of the energy storage system. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] Figure 1 A structural block diagram of an energy storage system in some embodiments;

[0059] Figure 2 A schematic diagram of a process flow of a thermal management method for an energy storage system in some embodiments;

[0060] Figure 3 A schematic diagram of a process for determining a first candidate management mode of a thermal management component relative to all battery clusters and a second candidate management mode of the thermal management component relative to all online battery clusters in an energy storage system based on temperature information and operating status information in some embodiments;

[0061] Figure 4 A schematic diagram of a process of determining a first candidate management mode of a thermal management component in an energy storage system relative to all battery clusters according to the temperatures of all battery clusters in some embodiments;

[0062] Figure 5 A schematic diagram of a flow chart of determining a second candidate management mode of a thermal management component relative to all online battery clusters based on a battery cluster temperature and an operating state of each battery cluster in some embodiments;

[0063] Figure 6 Schematic diagram of a flow chart of a thermal management method for an energy storage system in some other embodiments;

[0064] Figure 7 It is a schematic diagram of the structure of the energy storage battery container system in some embodiments;

[0065] Figure 8 Schematic diagram of a flow chart of a thermal management method for an energy storage system in some other embodiments;

[0066] Fig. 9 is a structural block diagram of a thermal management device of an energy storage system in some embodiments;

[0067] Fig.10 1 is a diagram of the internal structure of a computer device in some embodiments. DETAILED DESCRIPTION

[0068] The following embodiments of the technical solution of the present application will be described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0069] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0070] Reference to "embodiments" herein means that the specific features, structures, or characteristics described in conjunction with the embodiments may be included in at least some embodiments of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0071] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0072] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0073] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0074] The energy storage system, namely the string energy storage system, is a comprehensive energy storage solution based on power electronic conversion technology, energy management system and battery management system. It combines multiple independent battery modules in series and parallel through intelligent power electronic devices to achieve efficient management and application of batteries.

[0075] During the charging and discharging process, the energy storage system will generate a large amount of heat. If this heat cannot be effectively dissipated, it may cause the internal temperature of the battery to rise sharply, thereby causing thermal runaway and affecting the safe and stable operation of the energy storage system.

[0076] Energy storage systems usually use a centralized thermal management architecture, that is, there is only one cooling system in the entire energy storage system, and the water channels between the parallel battery clusters are interconnected and affect each other. Currently, the commonly used thermal management solutions all use a unified thermal design method to manage the thermal performance of the energy storage system. However, based on the string architecture of the energy storage system, when the energy storage system is running, some battery clusters may be charging and discharging, while others are stationary. If the currently commonly used thermal management solutions are used, it is easy to cause deviations in the thermal design, reduce the accuracy of the thermal management control of the energy storage system, and thus reduce the operational stability and safety of the energy storage system.

[0077] In order to improve the accuracy of thermal management control of the energy storage system, the temperature information and operating status information of each battery cluster in the energy storage system can be obtained. The current temperature of each battery cluster reflected by the temperature information and the current operating status of each battery cluster reflected by the operating status information can be used to determine the first candidate management mode of the thermal management component in the energy storage system equivalent to all battery clusters, and the second candidate management mode of the thermal management component relative to all online battery clusters. When the first candidate management mode is the same as the second candidate management mode, the first candidate management mode is determined as the target thermal management mode, so that the target thermal management mode finally determined can fully consider the operating conditions of each battery cluster in the energy storage system, especially the operating conditions of the online battery clusters, and be more in line with the actual operating conditions of the current energy storage system. Subsequently, the operation of the thermal management component in the energy storage system is controlled according to the target thermal management mode, and the energy storage system is thermally managed, which can effectively improve the operating stability and safety of the energy storage system.

[0078] The thermal management method of the energy storage system provided in the embodiment of the present application can be applied to Figure 1 In the energy storage system 100 shown, the energy storage system 100 includes a plurality of battery clusters 101 , a thermal management component 102 and a controller 103 .

[0079] like Figure 1 As shown, the battery cluster 101 may include battery cluster 1 to battery cluster n, wherein the specific value of n may be determined according to the actual application scenario. For example, the designer may flexibly adjust the number of battery clusters 101 in the energy storage system 100 according to the energy storage capacity actually required by the energy storage system 100. In the case of a large energy storage capacity, the number of battery clusters may be appropriately increased, and in the case of a small energy storage capacity, the number of battery clusters may be appropriately reduced. It is understandable that n may be a natural number greater than 1.

[0080] In some of the embodiments, each battery cluster 101 may include at least two battery energy storage systems (ESS). The battery energy storage module can be considered as the smallest energy storage and management unit in the energy storage system, which is composed of a number of energy storage elements connected in series or in parallel, and multiple battery energy storage modules can be connected in series to form a battery cluster.

[0081] It is understandable that when the energy storage system 100 is in operation, based on its string architecture, it can allow some battery clusters to be charged and discharged, and some battery clusters to be stationary, that is, the energy storage system 100 can simultaneously include battery clusters in a charging and discharging state and battery clusters in a stationary state.

[0082] The thermal management component 102 is a system component that can be used to perform thermal management on each battery cluster 101 in the energy storage system 100. It can cool down the battery cluster 101 when the temperature is too high, and heat up the battery cluster 101 when the temperature is too low, so that the battery cluster in the energy storage system 100 is at a suitable temperature, thereby improving the operating stability of the battery cluster 101.

[0083] In some of the embodiments, the thermal management component 102 may be a water cooling unit in the energy storage system 100. When the battery cluster 101 needs to be cooled, the water cooling unit may be controlled to operate in a cooling mode. Conversely, when the battery cluster 101 needs to be heated, the water cooling unit may be controlled to operate in a heating mode.

[0084] Among them, the controller 103 is a control component for managing and controlling the energy storage system 100. It can monitor battery information such as the charge state, temperature, current, voltage, etc. of the batteries in the energy storage system 100. At the same time, it can also interact with the upper system, such as the Energy Management System (EMS) or the Power Convert System (PCS), to achieve accurate management and control of the energy storage system 100.

[0085] In some of the embodiments, the controller 103 may be a battery management system (BMS) in the energy storage system.

[0086] In some optional embodiments, the controller 103 may obtain temperature information and operating status information of each battery cluster 101 in the energy storage system 100, and determine the first candidate management mode of the thermal management component 102 in the energy storage system 100 relative to all battery clusters, and the second candidate management mode of the thermal management component 102 relative to all online battery clusters based on the temperature information and the operating status information. When the first candidate management mode and the second candidate management mode are the same, the first candidate management mode is determined as the target thermal management mode, and the thermal management component 102 is controlled to operate according to the target thermal management mode to perform thermal management on the energy storage system 100.

[0087] In some embodiments, Figure 2 As shown, a thermal management method for an energy storage system is provided, and the method is applied to Figure 1 The controller 103 in the embodiment is taken as an example to illustrate, and the following steps are included:

[0088] S202, obtaining temperature information and operating status information of each battery cluster in the energy storage system.

[0089] Among them, temperature information is information data used to characterize the temperature conditions of each battery cluster in the energy storage system. For example, the temperature information may include the battery cluster temperature of each battery cluster in the energy storage system. In the energy storage system, the temperature of the battery cluster is one of the key parameters used to reflect the operation of the battery cluster. For example, the temperature of the battery cluster can reflect whether the battery cluster has the risk of local overheating or thermal runaway, and to a certain extent, it can also indirectly reflect the charge and discharge status of the battery cluster.

[0090] The operating status information is information data used to characterize the operating status of each battery cluster in the energy storage system. Based on the string architecture of the energy storage system, the operating status of the battery cluster in the energy storage system can include two states, one is the charging and discharging state, and the other is the static state. Among them, when the battery cluster is in the charging and discharging state, it means that the battery cluster is currently in the process of storing or releasing energy. When the battery cluster is in the static state, it means that the current plate of the battery cluster is zero without considering the self-discharge factor, and the battery terminal voltage remains at the open circuit voltage. The static state generally occurs within a period of time after the battery cluster completes the charging and discharging process. It can be understood that the operating status information can include the operating status of each battery cluster in the energy storage system.

[0091] In some optional embodiments, the controller may obtain temperature information and operating status information of each battery cluster in the energy storage system.

[0092] In some of the embodiments, the temperature information can be collected by a temperature detection component provided in the energy storage system after performing temperature detection on each battery cluster. It can be understood that the temperature detection component can be a temperature sensor. The temperature detection component can be independently provided. The specific number of settings can be determined according to actual collection requirements. For example, a corresponding temperature detection component can be provided for each battery cluster separately, or the settings can be integrated, for example, the temperature detection component and the controller are integrated into one setting.

[0093] In some of the embodiments, the operating status information may be determined by the energy storage system according to the operating parameter information of each battery cluster. For example, the operating status information of each battery cluster may be determined according to the real-time current information and real-time voltage information of each battery cluster.

[0094] In other embodiments, designers may set a switch component for each battery cluster in the energy storage system, for example, a relay may be set for each battery cluster, and the controller may determine the operating status information of each battery cluster according to the component status of the switch component.

[0095] S204, determining a first candidate management mode of the thermal management component in the energy storage system relative to all battery clusters based on the temperature information, and determining a second candidate management mode of the thermal management component relative to all online battery clusters based on the temperature information and the operating status information.

[0096] The thermal management component may correspond to a plurality of thermal management modes, and different thermal management modes correspond to different working states of the thermal management component. For example, the thermal management modes of the thermal management component may include cooling mode, heating mode, self-circulation mode, shutdown mode, etc.

[0097] Taking the water cooling unit in the energy storage system in which the thermal management mode is an example, in some embodiments, when the thermal management mode is the shutdown mode, the working state of the water cooling unit can be that the unit maintains communication and is in standby state. When the thermal management mode is the cooling mode, the working state of the water cooling unit can be that the compressor, condensing fan, and water pump are in working state. When the thermal management mode is the heating mode, the working state of the water cooling unit can be that the water pump and PTC are in working state. When the thermal management mode is the self-circulation mode, the working state of the water cooling unit can be that the water pump is in working state.

[0098] The first candidate management mode is the candidate thermal management mode of the thermal management component in the energy storage system relative to all battery clusters, that is, after considering the operating conditions of all battery clusters in the energy storage system, the controller believes that the thermal management mode executed by the thermal management component should be controlled. The second candidate management mode is the candidate management mode of the thermal management component in the energy storage system relative to all online battery clusters, that is, after considering the operating conditions of all online battery clusters in the energy storage system, the controller believes that the thermal management mode executed by the thermal management component should be controlled. It can be understood that an online battery cluster refers to a battery cluster whose operating state is a charging and discharging state.

[0099] In some optional embodiments, after obtaining the temperature information and operating status information of each battery cluster in the energy storage system, the controller can determine the temperature condition of each battery cluster based on the temperature information of each battery cluster, and determine the operating status of each battery cluster based on the operating status information of each battery cluster, and then determine the first candidate management mode of the thermal management component in the energy storage system relative to all battery clusters based on the temperature condition of each battery cluster, and determine the second candidate management mode of the thermal management component relative to all online battery clusters according to the temperature condition and operating status of each battery cluster.

[0100] In some of the embodiments, a thermal management mode determination model may be pre-set in the controller. After obtaining the temperature information and operating status information of each battery cluster, the thermal management mode determination model may be directly called to perform information analysis on the temperature information and operating status information, thereby determining a first candidate management mode of the thermal management component in the energy storage system relative to all battery clusters based on the temperature information of each battery cluster, and determining a second candidate management mode of the thermal management component relative to all online battery clusters based on the temperature information and operating status of each battery cluster.

[0101] S206 , when the first candidate management mode is the same as the second candidate management mode, determining the first candidate management mode as the target thermal management mode.

[0102] In some optional embodiments, when the controller determines the first candidate management mode and the second candidate management mode, it can match the first candidate management mode with the second candidate management mode. If the first candidate management mode is the same as the second candidate management mode, it can be considered that no matter whether the operation of the entire battery cluster in the energy storage system or the operation of all online battery clusters in the energy storage system is considered, the obtained candidate management mode is the same candidate management mode, and the controller can directly determine the first candidate management mode as the target thermal management mode.

[0103] S208, controlling the operation of the thermal management component according to the target thermal management mode to perform thermal management on the energy storage system.

[0104] In some optional embodiments, after determining the target thermal management mode, the controller may control the operation of the thermal management component according to the target thermal management mode to perform thermal management on the energy storage system.

[0105] Taking the controller as a BMS as an example, in some embodiments, after determining the target thermal management mode corresponding to the thermal management component, the BMS can generate a mode request based on the target thermal management mode and send the mode request to the thermal management system (TMS). The TMS will control the operation of the thermal management component according to the target thermal management mode based on the received mode request.

[0106] In the thermal management method of the above energy storage system, the controller can obtain the temperature information and operating status information of each battery cluster in the energy storage system, and determine the first candidate management mode of the thermal management component in the energy storage system equivalent to all battery clusters and the second candidate management mode of the thermal management component relative to all online battery clusters through the current temperature conditions of each battery cluster reflected by the temperature information and the current operating status of each battery cluster reflected by the operating status information. When the first candidate management mode is the same as the second candidate management mode, the first candidate management mode is determined as the target thermal management mode, so that the target thermal management mode finally determined fully considers the operating conditions of each battery cluster in the energy storage system, especially the operating conditions of the online battery clusters, and is more in line with the actual operating conditions of the current energy storage system. Subsequently, the operation of the thermal management component in the energy storage system is controlled according to the target thermal management mode, and the energy storage system is thermally managed, which can effectively improve the operating stability and safety of the energy storage system.

[0107] Since the first candidate management mode and the second candidate management mode will directly affect the target thermal management mode that is finally determined, the accuracy of the first candidate management mode and the second candidate management mode has a great influence on the accuracy of the target thermal management mode.

[0108] In some embodiments, Figure 3As shown, S204, based on the temperature information, determining a first candidate management mode of the thermal management component in the energy storage system relative to all battery clusters, and based on the temperature information and the operating status information, determining a second candidate management mode of the thermal management component relative to all online battery clusters, including:

[0109] S302 , extracting temperature information and operating status information respectively to determine the battery cluster temperature and operating status of each battery cluster.

[0110] In some optional embodiments, after obtaining the temperature information and operating status information of each battery cluster in the energy storage system, the controller may extract the temperature information and the operating status information respectively to determine the battery cluster temperature and operating status of each battery cluster.

[0111] In some of the embodiments, the temperature information and the operating status information may include other information such as detection time in addition to the battery cluster temperature and operating status of each battery cluster. Information extraction rules are pre-set in the controller, and the temperature information and the operating status information are extracted separately based on the preset information extraction rules, so that the battery cluster temperature and operating status of each battery cluster can be extracted from a large amount of information.

[0112] S304: Determine, according to the temperatures of all battery clusters, a first candidate management mode of a thermal management component in the energy storage system relative to all battery clusters.

[0113] In some optional embodiments, the controller may determine the first candidate management mode of the thermal management component in the energy storage system with respect to all battery clusters according to the obtained battery cluster temperatures of all battery clusters.

[0114] In some embodiments, the controller is pre-set with a method for determining the temperature and thermal management mode, and the controller can determine the first candidate management mode of the thermal management component in the energy storage system relative to all battery clusters according to the battery cluster temperatures of all battery clusters and the preset method for determining the temperature and thermal management mode. It can be understood that the method for determining the temperature and thermal management mode can be determined by the designer according to the actual thermal management requirements.

[0115] S306 : Determine a second candidate management mode of the thermal management component relative to all online battery clusters based on the battery cluster temperature and the operating state of each battery cluster.

[0116] In some optional embodiments, in order to determine the second candidate management mode of the thermal management component relative to all online battery clusters, the controller needs to first determine all online battery clusters in the energy storage system based on the operating status of each battery cluster, and then determine the second candidate management mode of the thermal management component relative to all online battery clusters based on the battery cluster temperature of each online battery cluster.

[0117] In some of the embodiments, similarly, after determining the battery cluster temperature of each online battery cluster, the controller can treat all online battery clusters as a whole and use a preset temperature and thermal management mode determination method to determine a second candidate management mode of the thermal management component relative to all online battery clusters.

[0118] In the above embodiment, by extracting temperature information and operating status information, the battery cluster temperature and operating status of each battery cluster can be accurately obtained from the information data, and then based on all battery cluster temperatures, a first candidate management mode that takes into account the operating conditions of all battery clusters in the energy storage system and a second candidate management mode that takes into account the operating conditions of all online battery clusters in the energy storage system can be determined, thereby improving the accuracy of determining the first candidate management mode and the second candidate management mode, and providing a data basis for the subsequent determination of an accurate target thermal management mode.

[0119] The following will describe how to determine the first candidate thermal management mode and the second candidate thermal management mode through several embodiments.

[0120] In some embodiments, Figure 4 As shown, S304, according to the temperatures of all battery clusters, determining a first candidate management mode of the thermal management component in the energy storage system relative to all battery clusters, including:

[0121] S402 , sorting all battery cluster temperatures to determine an overall maximum battery cluster temperature and an overall minimum battery cluster temperature.

[0122] The overall highest battery cluster temperature refers to the battery cluster temperature with the highest temperature value among all battery cluster temperatures, and the overall lowest battery cluster temperature refers to the battery cluster temperature with the lowest temperature value among all battery cluster temperatures.

[0123] In some optional embodiments, in order to reduce the judgment deviation caused by the battery temperature difference, the controller can make a judgment based on the overall minimum battery cluster temperature and the overall maximum battery cluster temperature when determining the first candidate thermal management mode that matches the overall operation of all battery clusters in the energy storage system. Therefore, after obtaining the battery cluster temperatures of all battery clusters in the energy storage system, the controller can sort all battery cluster temperatures to determine the highest temperature value from all battery cluster temperatures as the overall highest battery cluster temperature, and determine the lowest temperature value from all battery cluster temperatures as the overall lowest battery cluster temperature.

[0124] In some of these embodiments, the controller may sort all battery cluster temperatures in descending order, determine the first battery cluster temperature in the sequence as the overall highest battery cluster temperature, and determine the last battery cluster temperature in the sequence as the overall lowest battery cluster temperature.

[0125] S404 , calling respective mode activation conditions of respective preset thermal management modes, and matching the conditions with the overall highest battery cluster temperature and the overall lowest battery cluster temperature respectively.

[0126] The preset thermal management mode refers to the management mode that can be realized when controlling the operation of the thermal management component. The preset thermal management mode can be determined by the designer according to the actual operation of the thermal management component, and each management mode that can be realized by the thermal management component can be determined as the preset thermal management mode. For example, when the thermal management component is a water cooling unit, the corresponding preset thermal management mode may include cooling mode, heating mode, self-circulation mode, shutdown mode, etc.

[0127] It can be understood that each preset thermal management mode has a corresponding mode activation condition. By matching the conditions with the mode activation conditions of each preset thermal management mode, it can be determined whether the operation of the corresponding battery cluster in the energy storage system meets the requirements for activating a preset thermal management mode. The mode activation condition corresponding to the preset thermal management mode can also be determined by the designer according to the actual management effect of the preset thermal management mode and pre-configured in the controller.

[0128] In some optional embodiments, after obtaining the overall maximum battery cluster temperature and the overall minimum battery cluster temperature, the controller can match the conditions for starting each mode based on the overall maximum battery cluster temperature and the overall minimum battery cluster temperature to determine the thermal management mode satisfied by the overall battery cluster operation of the energy storage system.

[0129] S406: Determine the preset thermal management mode corresponding to the successfully matched mode activation condition as the first candidate management mode of the thermal management component in the energy storage system relative to all battery clusters.

[0130] In some optional embodiments, the controller may determine the preset thermal management mode corresponding to the mode-on condition with successful condition matching as the first candidate management mode of the thermal management component in the energy storage system with respect to all battery clusters.

[0131] In the above embodiment, the overall maximum battery cluster temperature and the overall minimum battery cluster temperature are determined from all battery cluster temperatures, and the overall maximum battery cluster temperature and the overall minimum battery cluster temperature are conditionally matched with the mode activation conditions of each preset thermal management mode to determine the first candidate management mode. When determining the first candidate management mode, the judgment error that may be caused by the battery temperature difference can be effectively reduced, the accuracy of the first candidate management mode can be improved, and a data basis can be provided for the subsequent determination of the final target thermal management mode.

[0132] In addition to the first candidate management mode, in some embodiments, such as Figure 5As shown, S306, based on the battery cluster temperature and operating state of each battery cluster, determining a second candidate management mode of the thermal management component relative to all online battery clusters, includes:

[0133] S502 : Determine at least two online battery clusters in each battery cluster based on the operating status of each battery cluster.

[0134] In some optional embodiments, after acquiring the operating status of each battery cluster, the controller may determine the battery clusters in the charging and discharging operating status among the battery clusters as online battery clusters, thereby determining at least two online battery clusters among the battery clusters.

[0135] S504 , sorting the online battery cluster temperatures of the online battery clusters to determine the highest online battery cluster temperature and the lowest online battery cluster temperature.

[0136] The online maximum battery cluster temperature refers to the battery cluster temperature with the highest temperature value among all online battery cluster temperatures, and the online minimum battery cluster temperature refers to the battery cluster temperature with the lowest temperature value among all online battery cluster temperatures.

[0137] In some optional embodiments, similarly, in order to reduce the judgment deviation caused by the battery temperature difference, the controller can make a judgment based on the online minimum battery cluster temperature and the online maximum battery cluster temperature when determining the second candidate thermal management mode that matches the overall operation of all online battery clusters in the energy storage system. Therefore, after obtaining the online battery cluster temperatures of all online battery clusters in the energy storage system, the controller can sort all the online battery cluster temperatures to determine the highest temperature value from all the online battery cluster temperatures as the online maximum battery cluster temperature, and determine the lowest temperature value from all the online battery cluster temperatures as the online minimum battery cluster temperature.

[0138] In some of these embodiments, the controller may sort all online battery cluster temperatures in descending order, determine the first online battery cluster temperature in the sequence as the online highest battery cluster temperature, and determine the last online battery cluster temperature in the sequence as the online lowest battery cluster temperature.

[0139] S506 , calling respective mode start conditions of respective preset thermal management modes, and matching them with the online highest battery cluster temperature and the online lowest battery cluster temperature respectively.

[0140] In some optional embodiments, after obtaining the maximum online battery cluster temperature and the minimum online battery cluster temperature, the controller can match the conditions for starting each mode based on the maximum online battery cluster temperature and the minimum online battery cluster temperature to determine the thermal management mode satisfied by the overall operation of the online battery cluster of the energy storage system.

[0141] S508: Determine the preset thermal management mode corresponding to the successfully matched mode activation condition as the second candidate management mode of the thermal management component relative to all online battery clusters.

[0142] In some optional embodiments, the controller may determine the preset thermal management mode corresponding to the mode-on condition with successful condition matching as the second candidate management mode of the thermal management component in the energy storage system relative to all online battery clusters.

[0143] In the above embodiment, the highest online battery cluster temperature and the lowest online battery cluster temperature are determined from all online battery cluster temperatures, and the highest online battery cluster temperature and the lowest online battery cluster temperature are conditionally matched with the mode start-up conditions of each preset thermal management mode to determine the second candidate management mode. When determining the second candidate management mode, the judgment error that may be caused by the battery temperature difference can be effectively reduced, the accuracy of the second candidate management mode can be improved, and a data basis can be provided for the subsequent determination of the final target thermal management mode.

[0144] In addition to the case where the first candidate management mode and the second candidate management mode are the same, in other embodiments, such as Figure 6 As shown, the thermal management method of the energy storage system also includes:

[0145] S602 : When the first candidate management mode is different from the second candidate management mode, determine at least two online battery clusters in each battery cluster.

[0146] In some optional embodiments, if the controller determines that the first candidate management mode is different from the second candidate management mode, it can be considered that since there are some battery clusters in the energy storage system that are charging and discharging, and some battery clusters that are stationary, the first candidate management mode determined based on the overall operation of all battery clusters in the energy storage system does not conform to the actual operation of the current energy storage system. At this time, the controller needs to determine a target thermal management mode that is more in line with the actual operation of the energy storage system based on the overall operation of all online battery clusters in the energy storage system. The controller can first determine at least two online battery clusters in each battery cluster. It can be understood that the specific steps for the controller to determine at least two online battery clusters in each battery cluster are roughly the same as those described above and will not be repeated here.

[0147] S604 , for each online battery cluster, obtaining cell temperature information of each battery cell in the online battery cluster.

[0148] Among them, the battery cell can also be called a battery energy storage module, which is a component unit of each battery cluster in the energy storage system, that is, the smallest energy storage and management unit in the energy storage system. Each battery cluster can contain at least two battery cells. When the battery cluster is running, each battery cell will have its corresponding cell temperature. The cell temperature information of each battery cell is information data used to reflect the cell temperature of each battery cell in the battery cluster. For example, the cell temperature information may include the cell temperature of each battery cell in the battery cluster.

[0149] In some optional embodiments, for each online battery cluster, the controller may obtain cell temperature information of each battery cell in the online battery cluster.

[0150] In some of the embodiments, the cell temperature information can be collected by a cell temperature detection component provided in the energy storage system after performing temperature detection on the battery cells in the battery cluster. It can be understood that the cell temperature detection component can be a temperature sensor, and the cell temperature detection component can be independently provided. The specific number of settings can be determined according to actual collection requirements. For example, a corresponding cell temperature detection component can be provided for each battery cell separately, or the settings can be integrated, for example, the cell temperature detection component and the controller are integrated into one setting.

[0151] S606 , determining a requested management mode of the thermal management component relative to the online battery cluster according to the unit temperature information.

[0152] The request management mode of the online battery cluster refers to the thermal management mode that the corresponding thermal management component should execute based on the operation of the online battery cluster. For example, if it is determined that the thermal management component should execute the cooling mode based on the operation of the online battery cluster, the request management mode of the online battery cluster can be considered to be the cooling mode.

[0153] In some optional embodiments, the controller may determine the requested management mode of the thermal management component relative to the online battery cluster including each battery cell according to the acquired cell temperature information of each battery cell.

[0154] In some of the embodiments, determining the request management mode of the thermal management component relative to the online battery cluster based on the cell temperature information includes: extracting information from the cell temperature information, determining the cell temperature of each battery cell, sorting the cell temperatures, determining the cell maximum battery cluster temperature and the cell minimum battery cluster temperature, calling the mode activation conditions of each preset thermal management mode, matching the conditions with the cell maximum battery cluster temperature and the cell minimum battery cluster temperature respectively, and determining the preset thermal management mode corresponding to the successfully matched mode activation condition as the request management mode of the thermal management component relative to the online battery cluster.

[0155] S608 : When the requested management modes corresponding to the online battery clusters are the same, determine the requested management mode as the target thermal management mode.

[0156] In some optional embodiments, after the controller obtains the request management mode corresponding to each online battery cluster based on the above method, it can perform pattern matching on each request management mode to determine whether the request management mode corresponding to each online battery cluster is the same. When the request management mode corresponding to each online battery cluster is the same, it means that the operation of each online battery cluster is relatively stable at this time, and the same request management mode can be determined as the target thermal management mode.

[0157] In the above embodiment, when the first candidate management mode does not conform to the actual operation of the current energy storage system, the controller can further determine the request management mode corresponding to each online battery cluster, and when the request management modes corresponding to each online battery cluster are consistent, the request management mode is determined as the target thermal management mode, so that the finally determined target thermal management mode is more in line with the overall operation of the online battery clusters of the energy storage system, providing a data basis for the subsequent safe and stable operation of the energy storage system.

[0158] In other embodiments, the thermal management method of the energy storage system further includes: when the request management modes are different, determining a target request management mode with the largest number from among the request management modes, and determining the target request management mode as the target thermal management mode.

[0159] In some optional embodiments, the controller performs pattern matching on each request management mode. When it is determined that the request management modes are different, the number of the request management modes can be counted, and the request management mode with the largest number among the request management modes can be determined as the target request management mode, and the target request management mode can be determined as the final target thermal management mode.

[0160] For example, the energy storage system contains 5 online battery clusters, and the request management modes corresponding to the 5 online battery clusters include cooling mode, self-circulation mode, cooling mode, cooling mode, and self-circulation mode. The cooling mode with the largest number can be determined as the final target thermal management mode.

[0161] In the above embodiment, when the request management modes are different, by determining the request management mode with the largest number as the target thermal management mode, the target thermal management mode finally determined can be most closely aligned with the overall operation of the online battery cluster in the energy storage system, thereby providing a data basis for the subsequent safe and stable operation of the energy storage system.

[0162] The above embodiments are examples of thermal management methods for energy storage systems when the number of available battery clusters in the energy storage system is fixed. In some special cases, new battery clusters may appear in the energy storage system. For example, after a battery cluster is repaired, it is reconnected in parallel to the energy storage system. At this time, how to effectively manage the thermal state of the energy storage system to improve the operational stability and safety of the energy storage system is also one of the problems that researchers are currently trying to solve.

[0163] In some embodiments, the thermal management method of the energy storage system further includes: when a new battery cluster exists in the energy storage system, obtaining a new request management mode of the new battery cluster, and determining a target thermal management mode of the energy storage system based on the new request management mode and the current thermal management mode of the energy storage system.

[0164] Among them, the newly added battery cluster refers to a battery cluster that is connected in parallel to the energy storage system when the energy storage system is running and has not been subjected to temperature difference adjustment processing. For example, a battery cluster is re-connected in parallel to the energy storage system after a fault repair. This battery cluster is a newly added battery cluster.

[0165] The newly added request management mode of the newly added battery cluster refers to the thermal management mode that the corresponding thermal management component should execute based on the operation of the newly added battery cluster. For example, based on the operation of the newly added battery cluster, it is determined that the thermal management component should execute the cooling mode, then the newly added request management mode of the newly added battery cluster can be considered to be the cooling mode.

[0166] The current thermal management mode of the energy storage system refers to the thermal management mode that the energy storage system is using when no new battery cluster is connected.

[0167] In some optional embodiments, when there is a new battery cluster in the energy storage system, there may be a large difference between the battery cluster temperature of the new battery cluster and the battery cluster temperature of other online battery clusters. If the temperature difference is large, there is a certain probability that a state conflict requiring a water cooling unit will occur. Therefore, when the controller determines that there is a new battery cluster in the energy storage system, it can obtain the new request management mode of the new battery cluster, and based on the new request management mode and the current thermal management mode of the energy storage system, determine whether there is a large temperature difference between the new battery cluster and other online battery clusters, and then determine the target thermal management mode of the energy storage system.

[0168] In some of the embodiments, the new request management mode of the new battery cluster can be directly determined by the staff when the new battery cluster is connected to the energy storage system, and the controller obtains the request management mode set by the staff as the new request management mode corresponding to the new battery cluster.

[0169] In some of the embodiments, the controller may obtain the newly added cell temperature information of each newly added battery cell in the newly added battery cluster, and determine the newly added request management mode corresponding to the newly added battery cluster based on the newly added cell temperature information.

[0170] In some of the embodiments, determining a new request management mode corresponding to a new battery cluster based on the new cell temperature information includes: extracting information from the new cell temperature information, determining the new cell temperature of each new battery cell, sorting the new cell temperatures, determining the maximum battery cluster temperature of the new cells and the minimum battery cluster temperature of the new cells, calling each preset thermal management mode's respective mode start-up condition, matching the conditions with the maximum battery cluster temperature of the new cells and the minimum battery cluster temperature of the new cells, and determining the preset thermal management mode corresponding to the successfully matched mode start-up condition as the new request management mode corresponding to the new battery cluster.

[0171] In the above embodiment, when there is a newly added battery cluster in the energy storage system, by determining whether there is a large temperature difference between the newly added battery cluster and other online battery clusters based on the newly added request management mode of the newly added battery cluster and the current thermal management mode of the energy storage system, and then determining the target thermal management mode of the energy storage system, the probability of confirmation error in the target thermal management mode due to the large temperature difference between the newly added battery cluster and other online battery clusters can be effectively reduced, thereby improving the confirmation accuracy of the target thermal management mode.

[0172] Furthermore, in some embodiments, based on the newly added management mode and the current thermal management mode of the energy storage system, a target thermal management mode of the energy storage system is determined, including: when the newly added requested management mode matches the current thermal management mode of the energy storage system, determining the current thermal management mode as the target thermal management mode of the energy storage system.

[0173] In some optional embodiments, when the controller determines that the newly requested management mode matches the current thermal management mode of the energy storage system, it can be considered that there is no large temperature difference between the newly added battery cluster and other online battery clusters, and the energy storage system can continue to operate based on the current thermal management mode. At this time, the controller can continue to determine the current thermal management mode as the target thermal management mode of the energy storage system.

[0174] In the above embodiment, by matching the newly added request management mode with the current thermal management mode of the energy storage system, it is possible to quickly determine whether the current thermal management mode conforms to the actual operation of the energy storage system after the addition of the battery cluster. When it is determined that the current thermal management mode is still an accurate thermal management mode, the controller can directly determine the current thermal management mode as the target thermal management mode of the energy storage system, thereby reducing the probability of confirmation errors in the target thermal management mode due to the large temperature difference between the newly added battery cluster and other online battery clusters, and also improving the confirmation efficiency of the target thermal management mode.

[0175] In other embodiments, the thermal management method of the energy storage system further includes: when the newly requested management mode does not match the current thermal management mode of the energy storage system, controlling the operation of the thermal management component according to the temperature difference adjustment thermal management mode, and when the operating time of the thermal management component reaches a preset time, determining the newly added battery cluster as an online battery cluster, and returning to execute the step of obtaining the temperature information and operating status information of each battery cluster in the energy storage system.

[0176] Among them, the temperature difference adjustment management mode is a thermal management mode that can adjust the temperature difference between the newly added battery cluster and other online battery clusters. The controller can make the battery cluster temperature of the newly added battery cluster gradually tend to be consistent with the battery cluster temperature of other online battery clusters, or stabilize within a preset temperature difference range by controlling the thermal management component to run the temperature difference adjustment management mode.

[0177] In some of the embodiments, the temperature difference regulation management mode may be a self-circulation mode, which refers to a thermal management mode in which only a water pump in the thermal management component is in working condition. The thermal management component drives the cooling liquid to circulate in the cooling pipe through the water pump to regulate the temperature difference between each battery cluster.

[0178] Among them, the preset duration is a preset judgment parameter used to determine whether the temperature difference between the newly added battery cluster and other online battery clusters has been adjusted. When the operating time of the thermal management component reaches the preset time, it can be considered that the temperature difference adjustment process for the newly added battery cluster has been completed, and the corresponding steps for determining the target thermal management mode can be executed.

[0179] In some optional embodiments, when the controller determines that the newly added request management mode does not match the current thermal management mode of the energy storage system, the controller may first control the operation of the thermal management component according to the preset temperature difference adjustment thermal management mode, and monitor in real time the operating time of the thermal management component in the temperature difference adjustment thermal management mode, and compare the operating time with the preset time. When the operating time reaches the preset time, it can be considered that the temperature difference adjustment process for the newly added battery cluster has been completed. The controller determines the newly added battery cluster as an online battery cluster, and returns to execute the step of obtaining the temperature information and operating status information of each battery cluster in the energy storage system, and re-determines the target thermal management mode for the energy storage system that meets the actual operating conditions of the current energy storage system.

[0180] In the above embodiment, when the newly added requested management mode does not match the current thermal management mode of the energy storage system, by adjusting the temperature difference of the newly added battery cluster and re-determining the target thermal management mode for the energy storage system that meets the actual operation of the current energy storage system after the adjustment is completed, the probability of confirmation error of the target thermal management mode due to the temperature difference can be reduced, thereby improving the confirmation accuracy of the target thermal management mode.

[0181] In some embodiments, a thermal management method for an energy storage system is provided, wherein the method is applied to Figure 7 The energy storage battery container system shown in the figure is used as an example for explanation. The energy storage battery container system mainly includes a battery compartment, a water cooling unit, an electrical compartment, a main control box and a high-voltage connection part. Among them, the electrical compartment includes a distribution compartment, a main control box and a fire control. There are multiple battery clusters stored in the battery compartment. Each battery cluster adopts a centralized thermal management architecture, that is, there is only one cooling system. The parallel battery clusters are interconnected through water cooling pipes and affect each other. The control components in the energy storage battery container system include a battery management system BMS and a water cooling unit control system TMS.

[0182] The thermal management modes and the working status of the thermal management components corresponding to the thermal management modes are shown in the following table:

[0183]

[0184] The current problems with energy storage battery container systems include: First, the string-type architecture allows some battery clusters in a battery container to be charged and discharged, while others are stationary. The current thermal management method cannot accurately manage the thermal performance of the energy storage battery container system, which can easily lead to thermal runaway and reduce the operational stability and safety of the energy storage battery container system. Second, when the repaired battery cluster is reconnected to the system in parallel, its temperature difference is quite different from that of other online charging and discharging battery clusters, and there may be a conflict in the required water cooling unit status.

[0185] In order to solve the above problems, Figure 8 As shown, the thermal management method of the energy storage system may include the following steps:

[0186] S801, BMS and TMS conduct mutual inspection.

[0187] Among them, the BMS and TMS conduct mutual inspection to determine whether there is a fault inside the control system.

[0188] S802: In case of internal fault, the BMS or TMS reports the fault for inspection and repair.

[0189] S803, when there is no internal fault, the BMS obtains the battery cluster temperature and operating status of each battery cluster in the system.

[0190] S804: Determine a first candidate management mode of the water cooling unit with respect to all battery clusters according to the battery cluster temperature of each battery cluster.

[0191] In some optional embodiments, the BMS can determine the overall maximum battery cluster temperature T from all battery cluster temperatures. max1and the overall minimum battery cluster temperature T min1 , based on T max1 and T min1 , determine the first candidate management mode for the water-cooling unit.

[0192] S805 , determining the online battery cluster temperature of each online battery cluster according to the state of each battery cluster relay.

[0193] S806 , determining a second candidate management mode of the water cooling unit with respect to all online battery clusters according to the online battery cluster temperature of each online battery cluster.

[0194] In some optional embodiments, the BMS can determine the online maximum battery cluster temperature T from all online battery cluster temperatures. max2 and the online minimum battery cluster temperature T min2 , based on T max2 and T min2 , determine the second candidate management mode of the water-cooling unit.

[0195] S807: Match the first candidate management mode with the second candidate management mode to determine whether the first candidate management mode is the same as the second candidate management mode.

[0196] S808: When the first candidate management mode and the second candidate management mode are the same, the TMS performs thermal management control according to the working state of the water cooling unit corresponding to the first candidate management mode.

[0197] S809 , when the first candidate management mode is different from the second candidate management mode, the BMS obtains the cell temperature of each battery cell in each online battery cluster.

[0198] S810, determining a request management mode of the water cooling unit for each online battery cluster according to the cell temperature of each battery cell.

[0199] In some optional embodiments, the BMS can determine the maximum unit temperature T from all unit temperatures. max3 and the unit minimum temperature T min3 , based on T max3 and T min3 , determine the request management mode of the water cooling unit relative to each online battery cluster.

[0200] S811, determining whether the management modes of the requests are the same.

[0201] S812: When all request management modes are the same, the TMS performs thermal management control according to the working state of the water cooling unit corresponding to the request management mode.

[0202] It can be understood that the requested management mode at this time is the second candidate management mode.

[0203] S813: When different request management modes exist, the BMS counts the number of online battery clusters corresponding to each request management mode.

[0204] S814, determining the requested management mode with the largest number of online battery clusters as the target thermal management mode, and requesting the target thermal management mode from the TMS.

[0205] S815, determining whether there is a new battery cluster in the energy storage system.

[0206] S816: In the absence of an additional battery cluster, continue to operate in the current thermal management mode.

[0207] S817 , in the case where there is a newly added battery cluster, determining whether the newly added thermal management mode of the newly added battery cluster is the same as the current thermal management mode.

[0208] S818: When the newly added thermal management mode is the same as the current thermal management mode, continue to operate according to the current thermal management mode.

[0209] S819: When the newly added thermal management mode is different from the current thermal management mode, the TMS executes the self-circulation mode.

[0210] S820, when the running time of the self-circulation mode reaches a preset time, the newly added battery cluster is updated to an online battery cluster, and the process returns to step S804.

[0211] S821, when the running time of the self-circulation mode does not reach the preset time, return to execute step S819.

[0212] It should be understood that, although the various steps in the flowcharts involved in the above-mentioned embodiments are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in sequence according to the order indicated by the arrows. Unless there is a clear explanation in this article, the execution of these steps does not have a strict order restriction, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above-mentioned embodiments can include multiple steps or multiple stages, and these steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a part of the steps or stages in other steps.

[0213] Based on the same inventive concept, the embodiment of the present application also provides a thermal management device for an energy storage system for implementing the thermal management method for an energy storage system involved above. The implementation solution provided by the device to solve the problem is similar to the implementation solution recorded in the above method, so the specific limitations in the embodiments of the thermal management device for one or more energy storage systems provided below can refer to the limitations of the thermal management method for an energy storage system above, and will not be repeated here.

[0214] In some embodiments, Fig. 9 As shown, a thermal management device 900 for an energy storage system is provided, comprising: an information acquisition module 901, a candidate management mode determination module 902, a target thermal management mode determination module 903 and a thermal management control module 904, wherein:

[0215] The information acquisition module 901 is used to acquire the temperature information and operation status information of each battery cluster in the energy storage system.

[0216] The candidate management mode determination module 902 is used to determine a first candidate management mode of the thermal management component in the energy storage system relative to all battery clusters based on the temperature information, and to determine a second candidate management mode of the thermal management component relative to all online battery clusters based on the temperature information and the operating status information.

[0217] The target thermal management mode determining module 903 is configured to determine the first candidate management mode as the target thermal management mode when the first candidate management mode is the same as the second candidate management mode.

[0218] The thermal management control module 904 is used to control the operation of the thermal management component according to the target thermal management mode to perform thermal management on the energy storage system.

[0219] In some embodiments, the candidate management mode determination module is used to: extract temperature information and operating status information respectively to determine the battery cluster temperature and operating status of each battery cluster; determine a first candidate management mode of the thermal management component in the energy storage system relative to all battery clusters based on the temperatures of all battery clusters; and determine a second candidate management mode of the thermal management component relative to all online battery clusters based on the battery cluster temperature and operating status of each battery cluster.

[0220] In some embodiments, the candidate management mode determination module is used to: sort all battery cluster temperatures to determine the overall maximum battery cluster temperature and the overall minimum battery cluster temperature; call each preset thermal management mode's respective mode activation conditions to match the conditions with the overall maximum battery cluster temperature and the overall minimum battery cluster temperature respectively; and determine the preset thermal management mode corresponding to the successfully matched mode activation condition as the first candidate management mode of the thermal management component in the energy storage system relative to all battery clusters.

[0221] In some embodiments, the candidate management mode determination module is used to: determine at least two online battery clusters in each battery cluster based on the respective operating status of each battery cluster; sort the online battery cluster temperatures of each online battery cluster to determine the highest online battery cluster temperature and the lowest online battery cluster temperature; call the mode start-up conditions of each preset thermal management mode to match the conditions with the highest online battery cluster temperature and the lowest online battery cluster temperature respectively; and determine the preset thermal management mode corresponding to the successfully matched mode start-up condition as the second candidate management mode of the thermal management component relative to all online battery clusters.

[0222] In some embodiments, the thermal management device of the energy storage system further includes:

[0223] The online battery cluster determination module is used to determine at least two online battery clusters in each battery cluster when the first candidate management mode is different from the second candidate management mode.

[0224] The cell temperature information acquisition module is used to acquire the cell temperature information of each battery cell in the online battery cluster for each online battery cluster.

[0225] The request management mode determination module is used to determine the request management mode of the thermal management component relative to the online battery cluster according to the unit temperature information.

[0226] The target thermal management mode determination module is further configured to, when the request management modes corresponding to the online battery clusters are the same, determine the request management mode as the target thermal management mode.

[0227] In some embodiments, the target thermal management mode determination module is further used to: determine the target request management mode with the largest number from among the request management modes when the request management modes are different; and determine the target request management mode as the target thermal management mode.

[0228] In some embodiments, the thermal management device of the energy storage system further includes:

[0229] The newly added request management mode determination module is used to obtain the newly added request management mode of the newly added battery cluster when there is a newly added battery cluster in the energy storage system.

[0230] The target thermal management mode determination module is further used to determine a target thermal management mode of the energy storage system based on the newly added requested management mode and the current thermal management mode of the energy storage system.

[0231] In some embodiments, the target thermal management mode determination module is further used to: when the newly added requested management mode matches the current thermal management mode of the energy storage system, determine the current thermal management mode as the target thermal management mode of the energy storage system.

[0232] In some embodiments, the thermal management device of the energy storage system further includes:

[0233] The temperature difference adjustment module is used to control the operation of the thermal management component according to the temperature difference adjustment thermal management mode when the newly added request management mode does not match the current thermal management mode of the energy storage system.

[0234] The circulation module is used to determine the newly added battery cluster as an online battery cluster when the operating time of the thermal management component reaches a preset time, and return to the information acquisition module to execute the step of acquiring temperature information and operating status information of each battery cluster in the energy storage system.

[0235] Each module in the thermal management device of the energy storage system can be implemented in whole or in part by software, hardware, or a combination thereof. Each module can be embedded in or independent of a processor in a computer device in the form of hardware, or can be stored in a memory in a computer device in the form of software, so that the processor can call and execute operations corresponding to each module.

[0236] In some embodiments, a computer device is provided. The computer device may be a controller, and its internal structure diagram may be as follows: Fig.10 As shown. The computer device includes a processor, a memory and a network interface connected through a system bus. Among them, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The database of the computer device is used to store data such as temperature information and operating status information of each battery cluster, a first candidate management mode, a second candidate management mode, and a target thermal management mode. The network interface of the computer device is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, a thermal management method for an energy storage system is implemented.

[0237] Those skilled in the art will understand that Fig.10 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0238] In some embodiments, a computer device is provided, including a memory and a processor, wherein a computer program is stored in the memory, and when the processor executes the computer program, specific implementation steps of the thermal management method of the energy storage system are implemented.

[0239] In some embodiments, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, specific implementation steps of the thermal management method of the energy storage system are implemented.

[0240] In some embodiments, a computer program product is provided, including a computer program, which, when executed by a processor, implements the specific implementation steps of the thermal management method of the energy storage system.

[0241] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties. In addition, the acquisition, storage, processing, and transmission of data are in compliance with relevant laws and regulations.

[0242] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to the memory, database or other medium used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetoresistive random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The database involved in each embodiment provided in this application may include at least one of a relational database and a non-relational database. Non-relational databases may include distributed databases based on blockchains, etc., but are not limited to this. The processor involved in each embodiment provided in this application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., but are not limited to this.

[0243] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0244] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A thermal management method for an energy storage system, characterized in that: The method comprises: Obtain temperature information and operating status information of each battery cluster in the energy storage system; determining a first candidate management mode of the thermal management component in the energy storage system relative to all battery clusters based on the temperature information, and determining a second candidate management mode of the thermal management component relative to all online battery clusters based on the temperature information and the operating state information; In a case where the first candidate management mode is the same as the second candidate management mode, determining the first candidate management mode as a target thermal management mode; Controlling the operation of the thermal management component according to the target thermal management mode to perform thermal management on the energy storage system; In the case where a new battery cluster exists in the energy storage system, obtaining a new request management mode of the new battery cluster; Based on the newly added requested management mode and the current thermal management mode of the energy storage system, a target thermal management mode of the energy storage system is determined.

2. The method according to claim 1, characterized in that The determining of a first candidate management mode of the thermal management component in the energy storage system relative to all battery clusters based on the temperature information, and determining a second candidate management mode of the thermal management component relative to all online battery clusters according to the temperature information and the operating status information, comprises: extracting the temperature information and the operating status information respectively to determine the battery cluster temperature and operating status of each of the battery clusters; Determining, according to the temperatures of all battery clusters, a first candidate management mode of the thermal management component in the energy storage system relative to all battery clusters; A second candidate management mode of the thermal management component relative to all online battery clusters is determined based on the battery cluster temperature and the operating state of each of the battery clusters.

3. The method according to claim 2, characterized in that The step of determining a first candidate management mode of the thermal management component in the energy storage system relative to all battery clusters according to the temperatures of all battery clusters includes: Sort all battery cluster temperatures to determine the overall highest battery cluster temperature and the overall lowest battery cluster temperature; Calling respective mode start conditions of each preset thermal management mode to match the conditions with the overall maximum battery cluster temperature and the overall minimum battery cluster temperature respectively; The preset thermal management mode corresponding to the successfully matched mode activation condition is determined as the first candidate management mode of the thermal management component in the energy storage system relative to all battery clusters.

4. The method according to claim 2, characterized in that: The determining, based on the battery cluster temperature and the operating state of each of the battery clusters, a second candidate management mode of the thermal management component relative to all online battery clusters comprises: Determining at least two online battery clusters among the battery clusters based on respective operating states of the battery clusters; Sorting the online battery cluster temperatures of the online battery clusters to determine the highest online battery cluster temperature and the lowest online battery cluster temperature; Calling respective mode start conditions of each preset thermal management mode to match the conditions with the online maximum battery cluster temperature and the online minimum battery cluster temperature respectively; The preset thermal management mode corresponding to the successfully matched mode start condition is determined as the second candidate management mode of the thermal management component relative to all online battery clusters.

5. The method according to any one of claims 1 to 4, characterized in that: The method further comprises: In a case where the first candidate management mode is different from the second candidate management mode, determining at least two online battery clusters in each of the battery clusters; For each of the online battery clusters, obtaining cell temperature information of each battery cell in the online battery cluster; determining a requested management mode of the thermal management component relative to the online battery cluster based on the cell temperature information; When the requested management modes corresponding to the online battery clusters are the same, the requested management mode is determined as the target thermal management mode.

6. The method according to claim 5, characterized in that The method further comprises: In the case that the request management modes are different, determining the target request management mode with the largest number from among the request management modes; The target requested management mode is determined as the target thermal management mode.

7. The method according to claim 1, characterized in that The determining a target thermal management mode of the energy storage system based on the newly added request management mode and the current thermal management mode of the energy storage system includes: In a case where the newly added requested management mode matches the current thermal management mode of the energy storage system, the current thermal management mode is determined as the target thermal management mode of the energy storage system.

8. The method according to claim 7, characterized in that The method further comprises: When the newly added request management mode does not match the current thermal management mode of the energy storage system, controlling the operation of the thermal management component according to the temperature difference adjustment thermal management mode; When the operation time of the thermal management component reaches a preset time, the newly added battery cluster is determined as an online battery cluster, and the process returns to the step of obtaining temperature information and operation status information of each battery cluster in the energy storage system.

9. A thermal management device for an energy storage system, characterized in that: The device comprises: An information acquisition module is used to obtain temperature information and operating status information of each battery cluster in the energy storage system; a candidate management mode determination module, configured to determine a first candidate management mode of the thermal management component in the energy storage system relative to all battery clusters based on the temperature information, and to determine a second candidate management mode of the thermal management component relative to all online battery clusters based on the temperature information and the operating state information; a target thermal management mode determining module, configured to determine the first candidate management mode as a target thermal management mode when the first candidate management mode is the same as the second candidate management mode; A thermal management control module, used to control the operation of the thermal management component according to the target thermal management mode, and perform thermal management on the energy storage system; A new request management mode determination module, used for obtaining a new request management mode of a new battery cluster when a new battery cluster exists in the energy storage system; The target thermal management mode determination module is further configured to determine a target thermal management mode of the energy storage system based on the newly added requested management mode and the current thermal management mode of the energy storage system.

10. A computer device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 8 are implemented.

11. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 8 are implemented.

12. A computer program product, comprising a computer program, characterized in that When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 8 are implemented.

13. An energy storage system, characterized in that: The energy storage system comprises a plurality of battery clusters, a thermal management component and a controller, wherein the controller is used to implement the thermal management method for the energy storage system according to any one of claims 1 to 8.

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