Cooling methods for energy storage systems, energy storage systems and energy storage devices

Abstract

This application relates to the field of energy storage, and more particularly to a cooling method, energy storage system, and energy storage device for an energy storage system. A cooling method for an energy storage system includes: acquiring temperature information of each battery cluster using a data acquisition device, and determining the first battery cluster requiring cooling based on the temperature information; when at least two first battery clusters are included, calculating the cooling priority of each first battery cluster, and determining the first battery cluster with the highest cooling priority as the target battery cluster; opening a second valve connecting the target battery cluster to a second liquid cooling unit, and cooling the target battery cluster through the second liquid cooling unit; wherein the first valve connecting each first battery cluster to the first liquid cooling unit is always open, and each first battery cluster is cooled by the first liquid cooling unit. This embodiment of the invention, by setting two sets of liquid cooling units to regulate the temperature of the battery clusters, ensures that the temperature of each battery cluster does not change significantly, while also achieving efficient single-cluster regulation.

Description

Technical Field

[0001] This application relates to the field of energy storage, and more particularly to a cooling method for an energy storage system, an energy storage system, and an energy storage device. Background Technology

[0002] Existing energy storage systems typically consist of multiple battery packs. These battery packs are connected in series or parallel to a power conversion system (PCS) and other auxiliary facilities to form an independently operable assembly called a battery cluster. Each battery cluster is connected to a liquid cooling pipeline via a valve, enabling thermal management of the individual battery cluster.

[0003] The energy storage system is also equipped with a liquid cooler unit, which is connected to the liquid cooling pipeline. The liquid cooler unit cools the coolant through a refrigeration cycle and then guides the coolant into the liquid cooling pipeline to cool the battery cluster.

[0004] When cooling a single battery cluster, the flow rate of different clusters can be adjusted by regulating the opening of the valves on the liquid cooling pipeline connected to the corresponding cluster, thus controlling the temperature to remain at a basically uniform level. However, this method inevitably leads to changes in the flow rate of other battery clusters, causing problems such as temperature increases. Summary of the Invention

[0005] This invention provides a cooling method, energy storage system, and energy storage device for an energy storage system, in order to solve the problem of other cluster temperature changes that may occur when cooling battery clusters using liquid cooling units in the prior art.

[0006] In a first aspect, embodiments of the present invention provide a cooling method for an energy storage system. The energy storage system includes multiple battery clusters, each of which is connected to a first liquid-cooled unit and a second liquid-cooled unit via valves. The cooling method for the energy storage system includes:

[0007] Temperature information of each battery cluster is acquired by a data acquisition device, and the first battery cluster that needs to be cooled is determined based on the temperature information.

[0008] When at least two of the first battery clusters are included, the cooling priority of each first battery cluster is calculated, and the first battery cluster with the highest cooling priority is determined as the target battery cluster.

[0009] The second valve connecting the target battery cluster to the second liquid cooling unit is opened, and the second valves of other battery clusters are closed, so that the target battery cluster is cooled by the second liquid cooling unit;

[0010] The first valve connecting each of the first battery clusters to the first liquid cooling unit is always open, and the first liquid cooling unit cools each of the first battery clusters.

[0011] Secondly, embodiments of the present invention provide an energy storage system, the energy storage system comprising multiple battery clusters, each battery cluster being connected to a first liquid-cooled unit and a second liquid-cooled unit via valves, the system comprising:

[0012] The first determining module acquires temperature information of each battery cluster through a data acquisition device, and determines the first battery cluster that needs to be cooled based on the temperature information.

[0013] The second determining module, when containing at least two first battery clusters, calculates the cooling priority of each first battery cluster and determines the first battery cluster with the highest cooling priority as the target battery cluster;

[0014] The cooling module connects the target battery cluster to the second valve of the second liquid cooling unit and closes the second valves of other battery clusters, thereby cooling the target battery cluster through the second liquid cooling unit.

[0015] The first valve connecting each battery cluster to the first liquid cooling unit is always open, and the first liquid cooling unit cools each battery cluster.

[0016] Thirdly, embodiments of the present invention provide an energy storage device, including the energy storage system described in any one of the second aspects, for performing the cooling method of the energy storage system described in any one of the first aspects.

[0017] In this embodiment of the invention, based on the existing set of liquid cooling units in the energy storage system, an additional set of liquid cooling units is added to simultaneously cool the battery clusters using both sets of liquid cooling units. The first set of liquid cooling units simultaneously cools each of the first battery clusters requiring cooling, and remains continuously connected without changing the valve status. This avoids temperature variations in each battery cluster caused by changes in coolant flow rate when cooling different battery clusters using a single cooling unit, ensuring that the temperature of each battery cluster remains at the same level without significant fluctuations. Simultaneously, based on the acquired temperature information, the highest priority target battery cluster is determined, and the second set of liquid cooling units individually adjusts the temperature of this highest priority target battery cluster to quickly bring its temperature to a normal level, achieving single-cluster temperature management of the target battery cluster. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 The figure shown is a schematic diagram of an energy storage system provided in an embodiment of this application;

[0020] Figure 2 The diagram shows a flowchart of a cooling method for an energy storage system provided in an embodiment of the present invention;

[0021] Figure 3 The diagram shown is a structural schematic of another energy storage system provided in an embodiment of this application;

[0022] Figure 4 The diagram shown is a structural schematic of an energy storage device provided in an embodiment of this application. Detailed Implementation

[0023] To better understand the technical solution of this application, the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0024] It should be understood that the described embodiments are merely some, not all, of the embodiments in this application. All other embodiments obtained by those skilled in the art based on the embodiments in this application without inventive effort are within the scope of protection of this application.

[0025] like Figure 1 The diagram shown is a structural schematic of an energy storage system provided in an embodiment of the present invention. The energy storage system provided in this embodiment includes a first liquid-cooled unit, a second liquid-cooled unit, and several battery clusters. Each battery cluster is connected to the first and second liquid-cooled units via valves.

[0026] The specific connection relationship between the battery cluster and the first and second liquid cooling units is as follows: Figure 1 As shown. Since the connection relationships between each battery cluster and the first and second liquid cooling units are identical, and the number of battery clusters within the energy storage system is not limited, therefore... Figure 1 Only one set of battery clusters is shown to illustrate the connection relationship.

[0027] See Figure 1 The battery cluster includes two water inlets and one water outlet. The battery cluster is connected to two independent water inlet pipes and one water outlet pipe through the two water inlets. The two water inlet pipes are in turn connected to the first liquid cooling unit and the second liquid cooling unit, respectively, for circulating coolant from the liquid cooling units to cool the battery cluster.

[0028] The valves installed on the inlet pipe are used to control the flow of water in the inlet pipe, thereby controlling the cooling of the battery clusters by the liquid cooling unit through the opening and closing of the valves. A first valve is installed on the pipe connected to the first liquid cooling unit, and a second valve is installed on the pipe connected to the second liquid cooling unit. Generally, the first valve is a solenoid valve, and the second valve is a ball valve.

[0029] The energy storage system also includes a Battery Management System (BMS). The battery clusters within the energy storage system also contain data acquisition devices.

[0030] The data acquisition equipment is deployed inside the battery cluster to collect temperature information from the battery cluster.

[0031] The BMS (Battery Management System) is communicatively connected to the data acquisition devices within each battery cluster, as well as the first and second valves of each cluster. It determines whether cooling is needed based on the temperature information of each cluster, and then controls the opening and closing of the first and second valves to perform cooling. The BMS does not... Figure 1 As shown in the image.

[0032] In this embodiment of the invention, two sets of liquid cooling units are installed in the energy storage system and connected to the battery clusters via inlet pipes and valves, respectively, to cool the battery clusters. The valves connecting the two sets of liquid cooling units to the battery clusters are controlled by the BMS within the energy storage system to distribute the coolant flowing to each battery cluster.

[0033] One set of liquid cooling units is used to cool the highest priority battery cluster among all the battery clusters that need to be cooled, so as to quickly adjust its temperature to the normal temperature and prevent the battery cluster from malfunctioning.

[0034] Another set of liquid cooling units is used to keep all battery clusters that require temperature regulation constantly connected, so that the coolant flows through all battery clusters that need to be cooled. This avoids the temperature fluctuations caused by the change in the flow of coolant to other battery clusters when the first set of liquid cooling units is used to flow coolant to one battery cluster, thus ensuring that the temperature of all battery clusters remains at the same level.

[0035] like Figure 2 The image shows a cooling method for an energy storage system provided by an embodiment of the present invention. This method is applied to, for example... Figure 1 The energy storage system shown is described in the following document. Figure 2 The specific steps of this method include:

[0036] S201: The temperature information of each battery cluster is acquired through the acquisition device, and the first battery cluster that needs to be cooled is determined based on the temperature information.

[0037] Specifically, the data acquisition devices are deployed above the cell plates within each battery cluster to collect the temperature of each cell within the cluster. When deploying the acquisition devices, it is necessary to ensure that the temperature sensors are deployed evenly and regularly to accurately reflect the temperature distribution of all cells within the battery pack. The acquired temperature information is the overall temperature of the battery cluster determined based on the cell temperatures collected by the various acquisition devices within the cluster. The temperature information can be the highest temperature within the battery cluster, the average temperature within the battery cluster, or other feasible temperature formats. This embodiment of the invention uses the highest temperature as an example for illustration.

[0038] Typically, the data acquisition device is implemented as a temperature sensor.

[0039] Based on the highest temperatures of each battery cluster, the average temperature of the energy storage system is determined. Furthermore, based on the difference between the highest temperature of each battery cluster and the average temperature of the energy storage system, the maximum temperature difference of each battery cluster is determined. The maximum temperature difference of the battery clusters reflects the gap between the battery cluster temperature and the normal system temperature, and this is used to determine whether cooling of the battery clusters is necessary.

[0040] In one specific implementation, the maximum temperature difference is calculated as follows:

[0041] ;

[0042] in, The highest temperature, The average temperature. This represents the maximum temperature difference.

[0043] By comparing the maximum temperature difference of each battery cluster with a preset cooling temperature threshold, the battery cluster with a maximum temperature difference greater than the cooling temperature threshold is identified as the first battery cluster that needs to be cooled. Battery clusters with a maximum temperature difference not greater than the cooling temperature threshold do not require cooling.

[0044] S202, when there are at least two first battery clusters, calculate the cooling priority of each first battery cluster, and determine the first battery cluster with the highest cooling priority as the target battery cluster.

[0045] Specifically, when there are multiple first battery clusters that need to be cooled at the same time, a target battery cluster is determined from them according to the cooling priority.

[0046] In this embodiment of the invention, the cooling priority of each first battery cluster can be quantitatively calculated. The cooling priority of the battery cluster is determined by three parts: the cumulative value of abnormal temperature of the battery cluster over a period of time, the rate of change of abnormal temperature over a period of time, and the amount of temperature abnormality exceeding the standard temperature. These are then quantitatively calculated using a first priority contribution value, a second priority contribution value, and a third priority contribution value.

[0047] Depending on the specific scenario, the three components of the cooling priority have different levels of importance. Different weighting coefficients are set for each component and assigned to the first priority contribution value, the second priority contribution value, and the third priority contribution value to comprehensively determine the cooling priority of the battery cluster in the corresponding scenario.

[0048] In the specific quantitative calculation, a first priority contribution value based on the cumulative temperature deviation, a second priority contribution value based on the maximum temperature change rate, and a third priority contribution value based on the temperature deviation value are determined for each first battery. Based on the first, second, and third priority contribution values ​​of each battery cluster, the cooling priority of each battery cluster is determined.

[0049] Specifically, the first priority contribution value is determined by the maximum temperature difference of each first battery cluster, the time during which the highest temperature of each first battery cluster exceeds the average temperature, and the corresponding first coefficient; the second priority contribution value is determined by the maximum temperature difference of each first battery cluster over a certain time interval and the average temperature difference of the energy storage system, and the corresponding second coefficient; and the third priority contribution value is determined by the maximum temperature difference of each first battery cluster and the corresponding third coefficient.

[0050] In one specific implementation, the cooling priority is calculated as follows:

[0051] ;

[0052] in, , , These are the first coefficient, the second coefficient, and the third coefficient, respectively. To correspond to the highest temperature of the first battery cluster, The average temperature. To correspond to the time when the first battery cluster exceeds the average temperature, The change over a certain time interval. This represents the change in the highest temperature between two consecutive time points. It represents the average temperature change over a certain time interval.

[0053] The first part of the above formula is used to characterize the cumulative value of the abnormal temperature of the battery cluster within time T, the second part is used to characterize the rate of change of the abnormal temperature of the battery cluster within the time period from T-1 to T, and the third part is used to characterize the magnitude of the battery cluster temperature exceeding the standard temperature.

[0054] In an embodiment of the present invention, , , The value of is determined by the actual operating conditions of the system and the parameters of each component of the energy storage system.

[0055] For example, if an energy storage system needs to perform continuous, uninterrupted charging and discharging over a long period, the accumulated deviation value will be relatively large during long-term operation, thus reducing... The value of is chosen to maintain the robustness of the expression through a smaller first coefficient; however, under high-rate, short-duration charge-discharge conditions, the system's temperature rise rate is high, so the value is reduced. The value of is maintained by using a smaller third coefficient to maintain the robustness of the expression.

[0056] S203, the second valve connecting the target battery cluster to the second liquid cooling unit is turned on, and the second valves of other battery clusters are turned off, so that the target battery cluster is cooled by the second liquid cooling unit; wherein, the first valve connecting each first battery cluster to the first liquid cooling unit is always turned on, so that each first battery cluster is cooled by the first liquid cooling unit.

[0057] Specifically, once multiple battery clusters are identified as the first battery cluster, the first valves of all first battery clusters are opened, and the first liquid cooling unit cools all first battery clusters to ensure that the temperature of each first battery cluster does not fluctuate significantly. At the same time, the second valve of the target battery cluster is opened, and the second liquid cooling unit cools the target battery cluster to quickly cool its temperature to a normal level.

[0058] Since the first valve is always open and does not require multiple adjustments, a ball valve can be used as the first valve; while since the second valve will be opened and closed multiple times, a solenoid valve can be used as the second valve.

[0059] This invention utilizes a first liquid cooling unit to simultaneously cool a first battery cluster requiring cooling, while maintaining a continuously open and uncontrolled valve state. This avoids temperature variations in the battery clusters caused by changes in coolant flow rate when cooling different battery clusters. Simultaneously, a second battery cluster regulates the temperature of the target battery cluster, achieving single-cluster temperature management.

[0060] Furthermore, by using the temperature information of the target battery cluster, it is determined whether the target battery cluster has achieved the desired cooling effect. When it is determined that the target battery cluster has achieved the desired cooling effect, the second valve connecting the target battery cluster to the second liquid cooling unit is closed, stopping the cooling of the target battery cluster through the second liquid cooling unit. The first battery cluster, with the next highest priority, is then designated as the target battery cluster, and its second valve connected to the second liquid cooling unit is opened for cooling. If it is determined that the target battery cluster has not achieved the desired cooling effect, the second valve connecting the target battery cluster to the second liquid cooling unit remains open to cool the second battery cluster.

[0061] In this embodiment of the invention, after the valve of the target battery cluster is turned on, temperature information is used to promptly determine whether cooling has been completed. Upon completion of cooling, the second valve is promptly closed, and other battery clusters are cooled, achieving energy savings and improved cooling efficiency.

[0062] Specifically, when determining whether the target battery cluster has achieved the cooling effect, the maximum temperature difference of the target battery cluster is compared with the preset cooling temperature threshold. When the maximum temperature difference is lower than the cooling temperature threshold, it is determined that the target battery cluster has achieved the cooling effect.

[0063] Optionally, when determining whether the target battery cluster has achieved the cooling effect, the minimum operating time can be calculated based on the temperature information, and the time for the target battery cluster to activate the second valve for cooling can be timed. When the actual cooling time of the target battery cluster by the second liquid cooling unit reaches the minimum operating time, it is determined that the target battery cluster has achieved the cooling effect.

[0064] The shortest operating time is the time required for the target battery cluster to be cooled by the second liquid cooling unit to ensure that the target battery cluster can achieve the cooling effect.

[0065] In this embodiment, by estimating the time required to cool the target battery cluster and determining that cooling is complete at the corresponding time, the second valve is closed. This avoids situations where the valve is not closed due to the failure to recognize that cooling has been completed, caused by various faults. It also avoids continuously cooling the same battery cluster under fault conditions, thereby achieving the effects of saving energy and improving cooling efficiency.

[0066] When calculating the shortest operating time based on temperature information, the temperature difference to be adjusted is determined based on the maximum temperature difference of the target battery cluster and the cooling temperature threshold. Generally, the temperature difference to be adjusted is the difference between the maximum temperature difference of the target battery cluster and the cooling temperature threshold.

[0067] Based on the temperature difference to be adjusted, the total mass of the target battery cluster, and the specific heat capacity of the battery cluster, the first heat release required to achieve the cooling effect of the target battery cluster is determined. Based on the specific heat capacity of the coolant in the second liquid cooling unit, the mass flow rate of the coolant per cluster, the inlet and outlet temperature difference of the coolant per cluster, and the heat generation rate of the target battery cluster, the second heat absorption required by the second liquid cooling unit to achieve the cooling effect of the target battery cluster is determined. The shortest operating time is determined based on the first and second heat releases.

[0068] The specific heat capacity of the battery cluster is determined by the average specific heat capacity of the cells, and the total mass of the target battery cluster is determined by the mass of each cell within the target battery cluster.

[0069] In one specific implementation, the shortest running time is calculated as follows:

[0070] ;

[0071] in, For the specific heat capacity of the battery cluster, The total mass of the target battery cluster, The temperature difference to be adjusted is used to determine the first heat. This refers to the specific heat capacity of the coolant in the second liquid-cooled unit. This refers to the mass flow rate of a single cluster of coolant. The temperature difference between the inlet and outlet of the coolant in a single cluster. The heat generation rate of the target battery cluster is used to determine the second heat source; The shortest running time is obtained by calculating the ratio of the first heat to the second heat.

[0072] In the above formula, The heat that the target battery cluster needs to release to reduce its temperature to a normal level, i.e., the first heat; The second heat is the amount of heat that the coolant in the second liquid cooling unit needs to absorb to lower the temperature of the target battery cluster to a normal level. The time required to lower the temperature of the target battery cluster to a normal level is determined by calculating the ratio of the first heat to the second heat.

[0073] Optionally, in some embodiments, the number of times each battery cluster needs cooling is counted, specifically the number of times the maximum temperature difference of each battery cluster exceeds a cooling temperature threshold. When the number of times any battery cluster needs cooling reaches a preset threshold, the second valve of the target battery cluster is continuously activated, and an alarm message is reported. This allows for the determination of whether the long-term temperature status of the battery cluster requires immediate temperature regulation.

[0074] Optionally, in some embodiments, when determining the temperature difference to be adjusted, in addition to determining it based on the maximum temperature difference of the target battery cluster and the cooling temperature threshold, a temperature difference adjustment redundancy value can be introduced. This redundancy value can be used to correct and adjust the temperature difference to be adjusted based on the maximum temperature difference and the cooling temperature threshold, so as to change the adjustment method of the battery cluster according to the actual scenario and the actual situation of the battery cluster, thereby improving the accuracy of the battery cluster temperature adjustment and improving the adjustment efficiency.

[0075] When the number of cooling operations required has not reached the preset threshold, as the number of times the same battery cluster is targeted for cooling increases, the temperature difference to be adjusted is increased through the temperature difference adjustment redundancy value. This is to cool the target battery cluster to a lower temperature, avoiding multiple adjustments caused by a rapid temperature rebound. Specifically, the more times the same battery cluster is cooled, the larger the temperature difference to be adjusted needs to be through the temperature difference adjustment redundancy value to cool the target battery cluster to a lower temperature.

[0076] The above embodiments take into account the actual situation of the battery cluster, namely the number of times the battery cluster is cooled, and adjust its cooling strategy by setting a temperature difference adjustment redundancy value. This can cool it to a relatively low temperature and reduce the number of cooling cycles.

[0077] Corresponding to the cooling method of the energy storage system described above, this application also provides an energy storage system. See [link to relevant documentation]. Figure 3 This is a schematic diagram of an energy storage system provided in an embodiment of this application. The energy storage system may include: a first determining module 301, a second determining module 302, and a cooling module 303.

[0078] The first determining module 301 acquires temperature information of each battery cluster through a data acquisition device, and determines the first battery cluster that needs to be cooled based on the temperature information.

[0079] The second determining module 302, when containing at least two of the first battery clusters, calculates the cooling priority of each of the first battery clusters and determines the first battery cluster with the highest cooling priority as the target battery cluster.

[0080] The cooling module 303 opens the second valve connecting the target battery cluster to the second liquid cooling unit and closes the second valves of other battery clusters, thereby cooling the target battery cluster through the second liquid cooling unit.

[0081] The first valve connecting each battery cluster to the first liquid cooling unit is always open, and the first liquid cooling unit cools each battery cluster.

[0082] Figure 4This is a schematic diagram of the structure of one embodiment of the electrical equipment described in this specification. The electrical equipment includes, for example: Figure 1 The energy storage system shown. (As shown in the image) Figure 4 As shown, the above-mentioned electronic device may include at least one processor; and at least one memory communicatively connected to the processing unit, wherein: the memory stores program instructions executable by the processing unit, and the processor can execute the cooling method of the energy storage system provided in this embodiment by calling the program instructions.

[0083] Figure 4 A block diagram of an exemplary electronic device suitable for implementing embodiments of this specification is shown. Figure 4 The electronic device shown is merely an example and should not be construed as limiting the functionality and scope of use of the embodiments described in this specification.

[0084] like Figure 4 As shown, the electronic device is represented in the form of a general-purpose computing device. The components of the electronic device may include, but are not limited to: one or more processors 410, communication interface 420, memory 430, and communication bus 440 connecting different system components (including memory 430, communication interface 420 and processor 410).

[0085] Communication bus 440 represents one or more of several bus architectures, including a memory bus or memory controller, a peripheral bus, a graphics acceleration port, a processor, or a local bus using any of the various bus architectures. For example, these architectures include, but are not limited to, Industry Standard Architecture (ISA) buses, Micro Channel Architecture (MAC) buses, Enhanced ISA buses, Video Electronics Standards Association (VESA) local buses, and Peripheral Component Interconnect (PCI) buses.

[0086] Electronic devices typically include a variety of computer-readable media. These media can be any available media that can be accessed by the electronic device, including volatile and non-volatile media, and removable and non-removable media.

[0087] Memory 430 may include computer system readable media in the form of volatile memory, such as random access memory (RAM) and / or cache memory. The electronic device may further include other removable / non-removable, volatile / non-volatile computer system storage media. Memory 430 may include at least one program product having a set (e.g., at least one) of program modules configured to perform the functions of the embodiments described herein.

[0088] A program / utility having a set (at least one) of program modules may be stored in memory 430. Such program modules include, but are not limited to, an operating system, one or more application programs, other program modules, and program data. Each or some combination of these examples may include an implementation of a network environment. The program modules typically perform the functions and / or methods described in the embodiments of this specification.

[0089] The processor 410 executes various functional applications and data processing by running programs stored in the memory 430, such as implementing the cooling method of the energy storage system provided in the embodiments shown in this specification.

[0090] This specification provides a non-transitory computer-readable storage medium that stores computer instructions that cause the computer to execute a cooling method for an energy storage system provided in the embodiments shown in this specification.

[0091] The foregoing has described specific embodiments of this specification. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recited in the claims may be performed in a different order than that shown in the embodiments and may still achieve the desired result. Furthermore, the processes depicted in the drawings do not necessarily require the specific or sequential order shown to achieve the desired result. In some embodiments, multitasking and parallel processing are possible or may be advantageous.

[0092] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this specification, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0093] Any process or method described in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or more executable instructions for implementing custom logic functions or processes, and the scope of the preferred embodiments of this specification includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order depending on the functions involved, as will be understood by those skilled in the art to which the embodiments of this specification pertain.

[0094] Depending on the context, the word "if" as used here can be interpreted as "when," "when," "in response to determination," or "in response to detection." Similarly, depending on the context, the phrase "if determination" or "if detection (of the stated condition or event)" can be interpreted as "when determination," "in response to determination," "when detection (of the stated condition or event)," or "in response to detection (of the stated condition or event)."

[0095] In the embodiments provided in this specification, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between apparatuses or units may be electrical, mechanical, or other forms.

[0096] Furthermore, the functional units in the various embodiments of this specification can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or in a combination of hardware and software functional units.

[0097] The integrated units implemented as software functional units described above can be stored in a computer-readable storage medium. These software functional units, stored in a storage medium, include several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) or processor to execute some steps of the methods described in the various embodiments of this specification.

[0098] The above description is merely a preferred embodiment of this specification and is not intended to limit this specification. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this specification should be included within the scope of protection of this specification.

Claims

1. A cooling method for an energy storage system, characterized in that, The energy storage system comprises multiple battery clusters, each of which is connected to a first liquid-cooled unit and a second liquid-cooled unit via valves. The cooling method of the energy storage system includes: Temperature information of each battery cluster is acquired by a data acquisition device, and the first battery cluster that needs to be cooled is determined based on the temperature information. When at least two of the first battery clusters are included, the cooling priority of each first battery cluster is calculated, and the first battery cluster with the highest cooling priority is determined as the target battery cluster. The second valve connecting the target battery cluster to the second liquid cooling unit is opened, and the second valves of other battery clusters are closed, so that the target battery cluster is cooled by the second liquid cooling unit; The first valve connecting each of the first battery clusters to the first liquid cooling unit is always open, and the first liquid cooling unit cools each of the first battery clusters.

2. The cooling method for the energy storage system according to claim 1, characterized in that, The step of determining the first battery cluster requiring cooling based on the temperature information includes: By comparing the maximum temperature difference of each battery cluster with a preset cooling temperature threshold, the battery cluster with the maximum temperature difference greater than the cooling temperature threshold is determined as the first battery cluster.

3. The cooling method for the energy storage system according to claim 1, characterized in that, The calculation of the cooling priority for each of the first battery clusters includes: Determine the first priority contribution value, the second priority contribution value, and the third priority contribution value based on the temperature deviation value for each of the first battery clusters. The cooling priority of each first battery cluster is determined based on its first priority contribution value, second priority contribution value, and third priority contribution value.

4. The cooling method for the energy storage system according to claim 3, characterized in that, The method includes: The first priority contribution value is determined by the maximum temperature difference of each first battery cluster, the time when the highest temperature of each first battery cluster exceeds the average temperature, and the corresponding first coefficient. The second priority contribution value is determined by the highest temperature difference of each first battery cluster at a time interval and the average temperature difference of the energy storage system, as well as the corresponding second coefficient. The third priority contribution value is determined by the maximum temperature difference of each of the first battery clusters and the corresponding third coefficient.

5. The cooling method for the energy storage system according to claim 1, characterized in that, After cooling the target battery cluster using the second liquid cooling unit, the method further includes: By using the temperature information of the target battery cluster, it can be determined whether the target battery cluster has achieved a cooling effect; When it is determined that the target battery cluster has achieved the cooling effect, the second valve connecting the target battery cluster to the second liquid cooling unit is closed, the cooling of the target battery cluster through the second liquid cooling unit is stopped, and the first battery cluster with the next lower priority is re-determined as the target battery cluster, and its second valve connected to the second liquid cooling unit is opened to cool it.

6. The cooling method for the energy storage system according to claim 5, characterized in that, Determining whether the target battery cluster has achieved a cooling effect includes: The maximum temperature difference of the target battery cluster is compared with a preset cooling temperature threshold. When the maximum temperature difference is lower than the cooling temperature threshold, it is determined that the target battery cluster has achieved the cooling effect.

7. The cooling method for the energy storage system according to claim 5, characterized in that, The method for determining whether the target battery cluster has achieved a cooling effect further includes: The shortest operating time is calculated based on the temperature information. The shortest operating time is the time required for the target battery cluster to be cooled by the second liquid cooling unit to ensure that the target battery cluster achieves the cooling effect. The time for cooling is performed by turning on the second valve of the target battery cluster is timed. When the actual cooling time of the second liquid cooling unit on the target battery cluster reaches the minimum operating time, it is determined that the target battery cluster has achieved the cooling effect.

8. The cooling method for the energy storage system according to claim 7, characterized in that, The calculation of the shortest running time based on the temperature information includes: The temperature difference to be adjusted is determined based on the maximum temperature difference of the target battery cluster and the cooling temperature threshold. Based on the temperature difference to be adjusted, the total mass of the target battery cluster, and the specific heat capacity of the battery cluster, the first heat required to be released for the target battery cluster to achieve the cooling effect is determined. Based on the specific heat capacity of the coolant in the second liquid cooling unit, the mass flow rate of the coolant in a single cluster, the temperature difference between the inlet and outlet of the coolant in a single cluster, and the heat generation rate of the target battery cluster, the second heat required by the second liquid cooling unit to achieve the cooling effect of the target battery cluster is determined. The shortest running time is determined based on the first heat and the second heat.

9. The cooling method for the energy storage system according to claim 5, characterized in that, After determining that the target battery cluster has achieved a cooling effect, the method further includes: The number of times each battery cluster needs to be cooled is statistically analyzed; When any battery cluster needs to be cooled a certain number of times, the second valve of the battery cluster that has reached the preset number of cooling times will be continuously opened, and an alarm message will be reported.

10. The cooling method for the energy storage system according to claim 8, characterized in that, The method further includes determining the temperature difference to be adjusted based on the maximum temperature difference of the target battery cluster and a cooling temperature threshold. The temperature difference to be adjusted is determined based on the maximum temperature difference of the target battery cluster, the cooling temperature threshold, and the temperature difference adjustment redundancy value. The temperature difference adjustment redundancy value is used to correct and adjust the temperature difference to be adjusted determined by the maximum temperature difference and the cooling temperature threshold.

11. The cooling method for the energy storage system according to claim 10, characterized in that, Adjusting the temperature difference to be adjusted by adjusting the redundancy value of the temperature difference includes: As the number of times the same battery cluster is cooled as the target battery cluster increases, the temperature difference to be adjusted is increased by adjusting the redundancy value of the temperature difference adjustment. The more times the same battery cluster is cooled, the greater the temperature difference to be adjusted will be by adjusting the redundancy value of the temperature difference.

12. The cooling method for the energy storage system according to any one of claims 1-11, characterized in that, The method further includes: The average temperature and / or maximum temperature difference of the target battery cluster are determined based on the temperature information.

13. The cooling method for the energy storage system according to any one of claims 1-11, characterized in that, The method further includes: The average temperature of the energy storage system is determined based on the highest temperature of each of the battery clusters. The maximum temperature difference between each battery cluster is determined based on the highest temperature of each battery cluster and the average temperature of the energy storage system.

14. An energy storage system, characterized in that, The energy storage system includes multiple battery clusters, each of which is connected to a first liquid-cooled unit and a second liquid-cooled unit via valves. The system includes: The first determining module acquires temperature information of each battery cluster through a data acquisition device, and determines the first battery cluster that needs to be cooled based on the temperature information. The second determining module, when containing at least two first battery clusters, calculates the cooling priority of each first battery cluster and determines the first battery cluster with the highest cooling priority as the target battery cluster; The cooling module connects the target battery cluster to the second valve of the second liquid cooling unit and closes the second valves of other battery clusters, thereby cooling the target battery cluster through the second liquid cooling unit. The first valve connecting each battery cluster to the first liquid cooling unit is always open, and the first liquid cooling unit cools each battery cluster.

15. The energy storage system according to claim 14, characterized in that, The first determining module uses the temperature information to determine the first battery cluster that needs cooling, including: By comparing the maximum temperature difference of each battery cluster with a preset cooling temperature threshold, the battery cluster with the maximum temperature difference greater than the cooling temperature threshold is determined as the first battery cluster.

16. The energy storage system according to claim 14, characterized in that, The second determining module calculates the cooling priority of each of the first battery clusters, including: Determine the first priority contribution value, the second priority contribution value, and the third priority contribution value based on the temperature deviation value for each of the first battery clusters. The cooling priority of each first battery cluster is determined based on its first priority contribution value, second priority contribution value, and third priority contribution value.

17. The energy storage system according to claim 14, characterized in that, After the cooling module cools the target battery cluster using the second liquid cooling unit, it also includes: By using the temperature information of the target battery cluster, it can be determined whether the target battery cluster has achieved a cooling effect; When it is determined that the target battery cluster has achieved the cooling effect, the second valve connecting the target battery cluster to the second liquid cooling unit is closed, the cooling of the target battery cluster through the second liquid cooling unit is stopped, and the first battery cluster with the next lower priority is re-determined as the target battery cluster, and its second valve connected to the second liquid cooling unit is opened to cool it.

18. The energy storage system according to claim 17, characterized in that, Determining whether the target battery cluster has achieved a cooling effect includes: The maximum temperature difference of the target battery cluster is compared with a preset cooling temperature threshold. When the maximum temperature difference is lower than the cooling temperature threshold, it is determined that the target battery cluster has achieved the cooling effect.

19. The energy storage system according to claim 17, characterized in that, The step of determining whether the target battery cluster has achieved a cooling effect also includes: The shortest operating time is calculated based on the temperature information. The shortest operating time is the time required for the target battery cluster to be cooled by the second liquid cooling unit to ensure that the target battery cluster achieves the cooling effect. The time for cooling is performed by turning on the second valve of the target battery cluster is timed. When the actual cooling time of the second liquid cooling unit on the target battery cluster reaches the minimum operating time, it is determined that the target battery cluster has achieved the cooling effect.

20. An energy storage device comprising the energy storage system of any one of claims 14-19, for performing the cooling method of the energy storage system of any one of claims 1-13.

Images