Temperature control method of energy storage system, controller and energy storage system

Abstract

The invention discloses a temperature control method of an energy storage system, a controller and the energy storage system.The energy storage system comprises at least two battery clusters, cooling pipelines corresponding to the battery clusters, connecting pipelines, valve assemblies and a liquid cooling unit, the cooling pipelines and the connecting pipelines form a pipeline network and are connected to the liquid cooling unit, and the valve assemblies are arranged in the pipeline network; the method comprises the following steps: acquiring temperature values of battery clusters, and determining the battery cluster with the highest temperature value as a target battery cluster; and controlling the on-off state of the valve assembly to switch the liquid cooling loop of the pipeline network, so that the cooling liquid conveyed by the liquid cooling unit through the liquid cooling loop firstly enters the cooling pipeline corresponding to the target battery cluster. The circulation path of the cooling liquid is changed by controlling the on-off state of the valve assembly, so that the cooling liquid can preferentially flow through the cooling pipeline corresponding to the target battery cluster, the energy utilization rate of the cooling liquid is improved, and the auxiliary power consumption of the system is reduced.

Description

Technical Field

[0001] This application relates to the technical field of energy storage control, and particularly relates to a temperature control method, a controller and an energy storage system for an energy storage system. Background Art

[0002] Currently, for existing liquid-cooled energy storage systems with two or more clusters, the liquid-cooled pipelines are divided into first, second, and third levels. Due to the complex pipeline layout, especially the switching ball valves at the transfer of the first-level pipelines or diode pipelines, liquid leakage often occurs after transportation, resulting in equipment downtime for repair. Such a pipeline layout structure is complex, with high processing costs, many interfaces, high liquid leakage risks, and high installation space requirements. Moreover, the coolant circuit solution of this pipeline layout structure is fixed, causing the first battery pack and the last battery pack that the coolant flows through to have long-term over-thermal management or insufficient thermal management, resulting in low thermal management efficiency, large auxiliary power consumption during system operation, and resource waste. Summary of the Invention

[0003] Embodiments of this application provide a temperature control method, a controller and an energy storage system for an energy storage system, which can make the coolant flow through the working battery cluster first and improve the efficiency of the temperature control system.

[0004] In a first aspect, embodiments of this application provide a temperature control method for an energy storage system. The energy storage system includes at least two battery clusters, cooling pipelines corresponding to the battery clusters, connecting pipelines, valve assemblies and a liquid-cooled unit. The cooling pipelines and the connecting pipelines form a pipeline network and are connected to the liquid-cooled unit, and the valve assemblies are arranged in the pipeline network. The method includes:

[0005] Obtain the temperature values of the battery clusters, and determine the battery cluster with the highest temperature value as the target battery cluster;

[0006] Control the on-off state of the valve assemblies to switch the liquid-cooled circuit of the pipeline network, so that the coolant transported by the liquid-cooled unit through the liquid-cooled circuit first enters the cooling pipeline corresponding to the target battery cluster.

[0007] In some embodiments, the energy storage system includes a first battery cluster and a second battery cluster. The cooling pipelines include a first cooling pipeline corresponding to the first battery cluster and a second cooling pipeline corresponding to the second battery cluster. The connecting pipelines include a first connecting pipeline, a second connecting pipeline and a third connecting pipeline. One end of the first cooling pipeline is connected to the liquid-cooled unit through the first connecting pipeline, the other end of the first cooling pipeline is connected to one end of the second cooling pipeline through the third connecting pipeline, and the other end of the second cooling pipeline is connected to the liquid-cooled unit through the second connecting pipeline.

[0008] In some embodiments, the valve assembly includes a first solenoid valve and a second solenoid valve. The first solenoid valve includes a first port, a second port, and a third port. The second solenoid valve includes a fourth port, a fifth port, and a sixth port. The first port and the fifth port are connected to the first cooling pipe through the first connecting pipe. The second port and the fourth port are connected to the second cooling pipe through the second connecting pipe. The third port is connected to the return pipe of the liquid cooling unit, and the sixth port is connected to the outlet pipe of the liquid cooling unit.

[0009] In some embodiments, controlling the on-off state of the valve assembly to switch the liquid cooling circuit of the pipeline network includes:

[0010] When the target battery cluster is the first battery cluster, open the second port, the third port, the fifth port, and the sixth port, and close the first port and the fourth port to switch the liquid cooling circuit of the pipeline network.

[0011] In some embodiments, controlling the on-off state of the valve assembly to switch the liquid cooling circuit of the pipeline network includes:

[0012] When the target battery cluster is the second battery cluster, open the first port, the third port, the fourth port, and the sixth port, and close the second port and the fifth port to switch the liquid cooling circuit of the pipeline network.

[0013] In some embodiments, the energy storage system includes a first battery cluster and a second battery cluster; obtaining the temperature values of the battery clusters and determining the battery cluster with the highest temperature value as the target battery cluster includes:

[0014] Obtain the first temperature value of the first battery cluster and the second temperature value of the second battery cluster;

[0015] When the first temperature value is greater than the second temperature value, determine the first battery cluster as the target battery cluster;

[0016] When the first temperature value is less than the second temperature value, determine the second battery cluster as the target battery cluster.

[0017] In some embodiments, the first battery cluster includes at least one first battery, and the second battery cluster includes at least one second battery; obtaining the first temperature value of the first battery cluster and the second temperature value of the second battery cluster includes:

[0018] Record the temperature of each first battery in the first battery cluster to obtain a first temperature set, and record the temperature of each second battery in the second battery cluster to obtain a second temperature set;

[0019] Determine a first temperature value according to the first temperature set, and determine a second temperature value according to the second temperature set.

[0020] In some embodiments, for obtaining the temperature value of the battery cluster and determining the battery cluster with the highest temperature value as the target battery cluster, the method further includes:

[0021] Determine the working state of each battery cluster;

[0022] For the battery clusters that are working, determine the battery cluster with the highest temperature among the working battery clusters as the target battery cluster. In a second aspect, an embodiment of the present application provides a controller, including at least one processor and a memory communicatively connected to the at least one processor; the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to execute the temperature control method of the energy storage system as described in the first aspect.

[0023] In a third aspect, an embodiment of the present application provides an energy storage system, including the controller described in the second aspect.

[0024] The temperature control method, controller and energy storage system of the energy storage system according to the embodiments of the present application have at least the following beneficial effects: The energy storage system in the embodiments of the present application includes at least two battery clusters, cooling pipelines corresponding to the battery clusters, connecting pipelines, valve assemblies and liquid cooling units, and the valve assemblies are arranged in the pipeline network to change the liquid flow direction in the pipeline network. Specifically, during the temperature control process, the embodiments of the present application first obtain the temperature value of the battery cluster and determine the battery cluster with the highest temperature as the target battery cluster, that is, the battery cluster that needs to be temperature-controlled preferentially, to realize the identification of the battery cluster that urgently needs temperature control, and then control the on-off state of the valve assembly to switch the liquid cooling circuit of the pipeline network, further changing the circulation path of the coolant, so that the coolant transported by the liquid cooling unit through the liquid cooling circuit first enters the cooling pipeline corresponding to the target battery cluster, realizing the cooling of the target battery cluster and improving the energy utilization rate of the energy storage system. The embodiments of the present application control the on-off state of the valve assembly to change the circulation path of the coolant, so that the coolant can preferentially flow through the cooling pipeline corresponding to the target battery cluster, improving the energy utilization rate of the coolant, thereby reducing the auxiliary power consumption of the system.

[0025] Other features and advantages of the present application will be described in the subsequent specification, and part of them will become obvious from the specification or be understood by implementing the present application. The objectives and other advantages of the present application can be achieved and obtained through the structures specifically pointed out in the specification and the drawings. Description of the Drawings

[0026] Figure 1Schematic diagram of the energy storage system provided by an embodiment of the present application;

[0027] Figure 2 Schematic diagram of the valve assembly provided by an embodiment of the present application;

[0028] Figure 3 Specific flowchart of the temperature control method for the energy storage system provided by an embodiment of the present application;

[0029] Figure 4 Specific flowchart of controlling the on / off state of the valve assembly to switch the liquid cooling circuit of the pipeline network;

[0030] Figure 5 Specific flowchart of controlling the on / off state of the valve assembly to switch the liquid cooling circuit of the pipeline network provided by another embodiment of the present application;

[0031] Figure 6 Specific flowchart of determining the battery cluster with the highest temperature value as the target battery cluster provided by an embodiment of the present application;

[0032] Figure 7 Specific flowchart of obtaining the first temperature value of the first battery cluster and the second temperature value of the second battery cluster provided by an embodiment of the present application;

[0033] Figure 8 Specific flowchart of determining the battery cluster with the highest temperature value as the target battery cluster provided by another embodiment of the present application;

[0034] Figure 9 Schematic diagram of the controller provided by an embodiment of the present application. Detailed Description of the Invention

[0035] In order to make the objectives, technical solutions and advantages of the present application more clear and understandable, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application. Additionally, the features, operations or characteristics described in the specification can be combined in any suitable manner to form various embodiments. Meanwhile, the steps or actions in the method description can also be reordered or adjusted in a manner that is obvious to those skilled in the art. Therefore, the various sequences in the specification and drawings are only for clearly describing a certain embodiment and do not mean that they are the necessary sequences, unless it is stated that a certain sequence must be followed.

[0036] In the description of the present application, the meaning of "several" is one or more, the meaning of "multiple" is more than two, and understandings such as "greater than", "less than", and "exceeding" do not include the base number, while understandings such as "above", "below", and "within" include the base number. If there is a description of "first" and "second", it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0037] The serial numbers assigned to components herein, such as "first", "second", etc., are only used to distinguish the described objects and do not have any sequential or technical meanings. And the "connection" and "coupling" mentioned in the present application, unless otherwise specified, both include direct and indirect connection (coupling).

[0038] Currently, for existing liquid-cooled energy storage systems with two or more clusters, the liquid-cooled pipelines are divided into first, second, and third levels. Due to the complex pipeline layout, especially the switching ball valves for the transfer of the first-level pipelines or diode pipelines, liquid leakage often occurs after transportation, resulting in equipment downtime for repair. Such a pipeline layout structure is complex, with high processing costs, many interfaces, high liquid leakage risks, and high installation space requirements. Moreover, the coolant circuit scheme of this pipeline layout structure is fixed, causing the first battery pack and the last battery pack that the coolant flows through to have long-term excessive or insufficient thermal management, resulting in low thermal management efficiency, large auxiliary power consumption during system operation, and resource waste.

[0039] Based on this, the embodiments of the present application provide a temperature control method, a controller, and an energy storage system for an energy storage system. The energy storage system in the embodiments of the present application includes at least two battery clusters, cooling pipelines corresponding to the battery clusters, connecting pipelines, valve assemblies, and a liquid-cooled unit. And the valve assemblies are arranged in the pipeline network to change the liquid flow direction in the pipeline network. Specifically, during the temperature control process, the embodiments of the present application first obtain the temperature values of the battery clusters, and determine the battery cluster with the highest temperature as the target battery cluster, that is, the battery cluster that needs to be temperature-controlled preferentially, to realize the identification of the battery cluster that urgently needs temperature control. Then, control the on-off state of the valve assemblies to switch the liquid-cooled circuit of the pipeline network, further changing the circulation path of the coolant, so that the coolant transported by the liquid-cooled unit through the liquid-cooled circuit first enters the cooling pipeline corresponding to the target battery cluster, realizing the cooling of the target battery cluster and improving the energy utilization rate of the energy storage system. The embodiments of the present application control the on-off state of the valve assemblies to change the circulation path of the coolant, enabling the coolant to preferentially flow through the cooling pipeline corresponding to the target battery cluster, improving the energy utilization rate of the coolant, and reducing the auxiliary power consumption of the system.

[0040] The following will describe the temperature control method, controller, and energy storage system for the energy storage system in conjunction with the accompanying drawings.

[0041] Refer to Figure 1 as shown Figure 1Schematic structural diagram of the energy storage system provided by the embodiment of the present application.

[0042] In some embodiments, the energy storage system includes at least two battery clusters, cooling pipelines corresponding to the battery clusters, connecting pipelines, a valve assembly, and a liquid cooling unit 300. The cooling pipelines and the connecting pipelines form a pipeline network and are connected to the liquid cooling unit 300. The valve assembly is arranged in the pipeline network to change the flow direction of the coolant in the pipeline network through the valve assembly.

[0043] It should be noted that each battery cluster in the embodiment of the present application includes at least one battery.

[0044] In some embodiments, the energy storage system further includes an energy storage cabinet. The battery clusters, cooling pipelines, connecting pipelines, valve assembly, and liquid cooling unit 300 are respectively arranged on the energy storage cabinet to reduce the occupied area of the energy storage system.

[0045] In some embodiments, the energy storage system includes a first battery cluster 110 and a second battery cluster 120. The cooling pipelines include a first cooling pipeline (not shown in the figure) corresponding to the first battery cluster 110 and a second cooling pipeline (not shown in the figure) corresponding to the second battery cluster 120. The connecting pipelines include a first connecting pipeline 210, a second connecting pipeline 220, and a third connecting pipeline 230. One end of the first cooling pipeline is connected to the liquid cooling unit 300 through the first connecting pipeline 210, the other end of the first cooling pipeline is connected to one end of the second cooling pipeline through the third connecting pipeline 230, and the other end of the second cooling pipeline is connected to the liquid cooling unit 300 through the second connecting pipeline 220 to form a pipeline network, so that the coolant transported by the liquid cooling unit 300 can flow through the first battery cluster 110 and the second battery cluster 120 to achieve temperature control of the battery clusters.

[0046] It should be noted that the third connecting pipeline 230 in the embodiment of the present application is arranged between the first battery cluster 110 and the second battery cluster 120 to form a series pipeline between the first battery cluster 110 and the second battery cluster 120. The liquid cooling pipelines of the two battery clusters adopt the series connection mode of the pipelines of the two battery clusters. The pipeline system only requires two - stage pipelines, saving pipeline costs, having fewer interfaces, fewer liquid leakage risk points, and saving installation space in the cabinet.

[0047] In some embodiments, the first cooling pipeline in the embodiment of the present application can be arranged around the first battery cluster 110 or looped around the first battery cluster 110. Similarly, the second cooling pipeline can be arranged around the second battery cluster 120 or looped around the second battery cluster 120. The embodiment of the present application does not make specific limitations.

[0048] Refer to Figure 2 as shown in Figure 2 Schematic structural diagram of the valve assembly provided by the embodiment of the present application.

[0049] In some embodiments, the valve assembly includes a first solenoid valve 410 and a second solenoid valve 420, the first solenoid valve 410 includes a first port a, a second port b and a third port c, the second solenoid valve 420 includes a fourth port d, a fifth port e and a sixth port f, the first port a and the fifth port e are connected to the first cooling pipe through the first connecting pipe 210, and the coolant can be delivered to the first battery cluster 110 or flow back to the liquid cooling unit 300 through the first battery cluster 110 by changing the state of the first port a and the fifth port e, the second port b and the fourth port d are connected to the second cooling pipe through the second connecting pipe 220, and the coolant can be delivered to the second battery cluster 120 or flow back to the liquid cooling unit 300 by changing the state of the second port b and the fourth port d, the third port c is connected to the return pipe of the liquid cooling unit 300, and the sixth port f is connected to the outlet pipe of the liquid cooling unit 300, so as to change the circulation path of the coolant by controlling the switch state of each port in the solenoid valve.

[0050] It should be noted that the liquid cooling unit 300 in the embodiment of the present application includes a water pump 310, the third port c of the first solenoid valve 410 is connected to the return pipe of the water pump 310, and the sixth port f of the second solenoid valve 420 is connected to the outlet pipe of the water pump 310. The first solenoid valve 410 and the second solenoid valve 420 may be T-type or Y-type three-way solenoid valves to form different circulation paths in the pipeline network.

[0051] It is understandable that when the first solenoid valve 410 and the second solenoid valve 420 are T-type three-way valves, the three channels of the T-type three-way solenoid valve are distributed in a T shape, which can realize multiple functions such as diversion, confluence, and reversing. The first solenoid valve 410 and the second solenoid valve 420 can be connected to three pipelines at the same time, so that the fluid can be flexibly switched between three directions to meet complex pipeline control requirements. Through the power-on and power-off operations of the solenoid valve, the flow direction of the fluid between different pipelines can be accurately controlled to ensure that the fluid flows along a preset path, thereby improving the control accuracy and reliability of the system. When the first solenoid valve 410 and the second solenoid valve 420 are Y-type three-way valves, the flow channel of the Y-type three-way solenoid valve is Y-shaped. When the fluid flows through the valve, its flow path is relatively smooth and the fluid resistance is relatively small, which helps to reduce energy loss and improve the energy efficiency of the system.

[0052] It can be understood by those skilled in the art that Figure 1 The schematic diagram shown in does not constitute a limitation on the embodiments of the present application, and may include more or fewer components than shown in the figure, or a combination of certain components, or a different arrangement of components. The temperature control method in the embodiments of the present application is specifically described below.

[0053] Reference Figure 3 ,Figure 3 This is a specific flowchart of the temperature control method for the energy storage system provided by the embodiments of the present application. The temperature control method is applicable to, but not limited to, Figure 1 the energy storage system in

[0054] Step S101: Obtain the temperature values of the battery clusters, and determine the battery cluster with the highest temperature value as the target battery cluster.

[0055] Step S102: Control the on-off state of the valve assembly to switch the liquid cooling circuit of the pipeline network, so that the coolant transported by the liquid cooling unit 300 through the liquid cooling circuit first enters the cooling pipeline corresponding to the target battery cluster.

[0056] In steps S101 to S102 of some embodiments, the embodiments of the present application first obtain the temperature values of all battery clusters, compare the temperature values of all battery clusters, and determine the battery cluster with the highest temperature value as the target battery cluster, so as to identify and distinguish the battery clusters in urgent need of temperature control, realize the accurate selection of the target battery cluster, and then control the on-off state of the valve assembly to switch the liquid cooling circuit of the pipeline network, so as to be able to formulate the circulation path of the coolant according to the actual working conditions, so that the coolant transported by the liquid cooling unit 300 through the liquid cooling circuit first enters the cooling pipeline corresponding to the target battery cluster, so that the coolant first flows through the battery cluster with a higher temperature during operation, improving the energy utilization rate of the coolant and reducing the auxiliary power consumption of the system.

[0057] It can be understood that the battery cluster with a higher temperature generates more heat. When the coolant first flows through here, it can quickly absorb a large amount of heat, rapidly reduce the battery temperature, thereby more effectively controlling the temperature of the battery. Moreover, cooling the high-temperature battery cluster first can avoid excessive heat transfer and accumulation between battery clusters, make the temperature distribution of the entire battery pack more uniform, and improve the utilization efficiency of the coolant.

[0058] Refer to Figure 4 , Figure 4 This is a specific flowchart of controlling the on-off state of the valve assembly to switch the liquid cooling circuit of the pipeline network provided by the embodiments of the present application. The method includes, but is not limited to, step S201.

[0059] It should be noted that the energy storage system includes a first battery cluster 110 and a second battery cluster 120.

[0060] Step S201: When the target battery cluster is the first battery cluster 110, open the second port b, the third port c, the fifth port e, and the sixth port f, and close the first port a and the fourth port d to switch the liquid cooling circuit of the pipeline network.

[0061] In step S201 of some embodiments, when the target battery cluster is the first battery cluster 110, it indicates that the temperature of the first battery cluster 110 is relatively high and temperature adjustment needs to be prioritized. The second port b and the third opening of the first solenoid valve 410, and the fifth port e and the sixth port f of the second solenoid valve 420 are opened, while the first port a of the first solenoid valve 410 and the fourth port d of the second solenoid valve 420 are closed to switch the liquid cooling circuit of the pipeline network. At this time, the coolant of the liquid cooling unit 300 flows out from the water outlet pipe, enters the first cooling pipeline corresponding to the first battery cluster 110 through the fifth port e and the sixth port f of the second solenoid valve 420 first, realizes the temperature control of the first battery cluster 110. After the coolant flows through the first battery cluster 110, it then flows to the second cooling pipeline corresponding to the second battery cluster 120, and then returns to the water return pipe of the liquid cooling unit 300 through the second port b and the third port c of the first solenoid valve 410, forming a circulating path of water outlet pipe - second solenoid valve 420 - first battery cluster 110 - second battery cluster 120 - first solenoid valve 410 - water return pipe, so as to realize the temperature control of the first battery cluster 110 and the second battery cluster 120 in sequence, improve the thermal management efficiency of the energy storage system, and save resources.

[0062] Refer to Figure 5 , Figure 5 is a specific flowchart for controlling the on / off state of the control valve assembly to switch the liquid cooling circuit of the pipeline network provided by another embodiment of the present application. The method includes but is not limited to step S301.

[0063] Step S301, when the target battery cluster is the second battery cluster 120, open the first port a, the third port c, the fourth port d, and the sixth port f, and close the second port b and the fifth port e to switch the liquid cooling circuit of the pipeline network.

[0064] In step S301 of some embodiments, when the target battery cluster is the second battery cluster 120, it indicates that the temperature of the second battery cluster 120 is relatively high and temperature adjustment needs to be prioritized. Open the first port a and the third port c of the first solenoid valve 410, as well as the fourth port d and the sixth port f of the second solenoid valve 420, and at the same time close the second port b of the first solenoid valve 410 and the fifth port e of the second solenoid valve 420 to switch the liquid cooling circuit of the pipeline network. At this time, the coolant of the liquid cooling unit 300 flows out from the water outlet pipe, enters the second cooling pipe corresponding to the second battery cluster 120 through the fourth port d and the sixth port f of the second solenoid valve 420 first, to achieve temperature control of the second battery cluster 120. After the coolant flows through the second battery cluster 120, it then flows to the first cooling pipe corresponding to the first battery cluster 110, and then returns to the water return pipe of the liquid cooling unit 300 through the first port a and the third port c of the first solenoid valve 410, forming a circulation path of water outlet pipe - second solenoid valve 420 - second battery cluster 120 - first battery cluster 110 - first solenoid valve 410 - water return pipe, so as to achieve temperature control of the second battery cluster 120 and the first battery cluster 110 in sequence, improve the thermal management efficiency of the energy storage system, and save resources.

[0065] Refer to Figure 6 , Figure 6 is a specific flowchart for determining the battery cluster with the highest temperature value as the target battery cluster provided by the embodiments of the present application. The method includes but is not limited to steps S401 to S403.

[0066] Step S401, obtain the first temperature value of the first battery cluster 110 and the second temperature value of the second battery cluster 120.

[0067] Step S402, when the first temperature value is greater than the second temperature value, determine the first battery cluster 110 as the target battery cluster.

[0068] Step S403, when the first temperature value is less than the second temperature value, determine the second battery cluster 120 as the target battery cluster.

[0069] In steps S401 to S403 of some embodiments, in the process of obtaining the temperature values of the battery clusters and determining the battery cluster with the highest temperature value as the target battery cluster, the embodiment of the present application first obtains the first temperature value of the first battery cluster 110 and the second temperature value of the second battery cluster 120, and then compares the first temperature value and the second temperature value. When the first temperature value is greater than the second temperature value, it indicates that the operating temperature of the current first battery cluster 110 is higher. At this time, the first battery cluster 110 is determined as the target battery cluster; when the first temperature value is less than the second temperature value, it indicates that the operating temperature of the second battery cluster 120 is higher. At this time, the second battery cluster 120 is determined as the target battery cluster, realizing the accurate selection of the target battery cluster, being able to preferentially adjust the temperature of the battery cluster with a higher temperature, allowing the coolant to flow through the working battery cluster first, and improving the efficiency of the temperature control system.

[0070] It can be understood that when the first temperature value of the first battery cluster 110 is equal to the temperature of the second battery cluster 120, at this time, either the first battery cluster 110 or the second battery cluster 120 can be directly determined as the target battery cluster, which is convenient for controlling the on-off state of the valve assembly in the subsequent process. The embodiment of the present application does not make specific limitations.

[0071] Refer to Figure 7 , Figure 7 is a specific flowchart for the embodiment of the present application to obtain the first temperature value of the first battery cluster 110 and the second temperature value of the second battery cluster 120. The method includes but is not limited to steps S501 to S502.

[0072] It should be noted that the first battery cluster 110 includes at least one first battery, and the second battery cluster 120 includes at least one second battery.

[0073] Step S501, record the temperature of each first battery in the first battery cluster 110 to obtain a first temperature set, and record the temperature of each second battery in the second battery cluster 120 to obtain a second temperature set.

[0074] Step S502, determine the first temperature value according to the first temperature set, and determine the second temperature value according to the second temperature set.

[0075] In steps S501 to S502 of some embodiments, in the process of obtaining the first temperature value of the first battery cluster 110 and the second temperature value of the second battery cluster 120, the embodiments of the present application first record the temperatures of each first battery in the first battery cluster 110 to obtain a first temperature set, and record the temperatures of each second battery in the second battery cluster 120 to obtain a second temperature set, so as to record the temperatures of all the first batteries in the first battery cluster 110 and the temperatures of all the second batteries in the second battery cluster 120. At the same time, the number of first batteries can be determined through the first temperature set, and the number of second batteries can also be determined through the second temperature set. Then, the temperatures of all the first batteries in the first temperature set are added up and divided by the number of first batteries to obtain the first average temperature of the first battery cluster 110, and this first average temperature is used as the first temperature value. Similarly, the temperatures of all the second batteries in the second temperature set are added up and divided by the number of second batteries to obtain the second average temperature of the second battery cluster 120, and this second average temperature is used as the second temperature value, thereby improving the stability of the energy storage system, facilitating subsequent comparison of the first temperature value and the second temperature value, and improving the comparison accuracy.

[0076] Refer to Figure 8 , Figure 8 FIG. is a specific flowchart for determining the battery cluster with the highest temperature value as the target battery cluster provided by another embodiment of the present application. The method includes but is not limited to steps S601 to S602.

[0077] Step S601, determine the working state of each battery cluster.

[0078] Step S602, for the battery clusters that are working, determine the battery cluster with the highest temperature among the working battery clusters as the target battery cluster.

[0079] In steps S601 to S602 of some embodiments, in the process of obtaining the temperature value of the battery cluster and determining the battery cluster with the highest temperature value as the target battery cluster, the embodiments of the present application can also determine the working state of each battery cluster, that is, whether the battery cluster is in a working state or a non-working state. For the battery clusters that are working, obtain the temperature values of all the working battery clusters, and take the battery cluster with the highest temperature among the working battery clusters as the target battery cluster, so as to be able to identify and distinguish the battery clusters in urgent need of temperature control and achieve accurate selection of the target battery cluster.

[0080] It should be noted that, taking the energy storage system including the first battery cluster 110 and the second battery cluster 120 as an example, in the embodiment of the present application, the working states of the first battery cluster 110 and the second battery cluster 120 are first determined. When the first battery cluster 110 is working and the second battery cluster 120 is not working, the embodiment of the present application directly determines the first battery cluster 110 as the target battery cluster, and controls the on-off state of the valve assembly to switch the liquid cooling circuit of the pipeline network, so that the coolant transported by the liquid cooling unit 300 through the liquid cooling circuit first enters the cooling pipeline corresponding to the first battery cluster 110, and then enters the cooling pipeline corresponding to the second battery cluster 120.

[0081] Taking the energy storage system including the fourth battery cluster, the fifth battery cluster and the sixth battery cluster as an example, in the embodiment of the present application, the working states of the fourth battery cluster, the fifth battery cluster and the sixth battery cluster are first determined. When the fourth battery cluster and the fifth battery cluster are working and the sixth battery cluster is not working, the embodiment of the present application first obtains the temperature values of the fourth battery cluster and the fifth battery cluster. When the temperature value of the fourth battery cluster is greater than the temperature value of the fifth battery cluster, the fourth battery cluster is determined as the target battery cluster. At this time, the on-off state of the valve assembly is controlled to switch the liquid cooling circuit of the pipeline network, so that the coolant transported by the liquid cooling unit 300 through the liquid cooling circuit first enters the cooling pipeline corresponding to the fourth battery cluster, then enters the cooling pipeline corresponding to the fifth battery cluster, and finally enters the cooling pipeline corresponding to the sixth battery cluster. When the temperature value of the fifth battery cluster is greater than the temperature value of the fourth battery cluster, the fifth battery cluster is determined as the target battery cluster. At this time, the on-off state of the valve assembly is controlled to switch the liquid cooling circuit of the pipeline network, so that the coolant transported by the liquid cooling unit 300 through the liquid cooling circuit first enters the cooling pipeline corresponding to the fifth battery cluster, then enters the cooling pipeline corresponding to the fourth battery cluster, and finally enters the cooling pipeline corresponding to the sixth battery cluster, thereby avoiding the situation that the battery cluster where the coolant first flows through and the last battery cluster where the coolant flows through are overheated or insufficiently managed for a long time, improving the thermal management efficiency of the energy storage system, and saving resources.

[0082] As Figure 9 shown, Figure 9 is a schematic diagram of the controller 1000 provided by an embodiment of the present application.

[0083] The controller 1000 of the embodiment of the present application includes one or more processors 1001 and a memory 1002. Figure 9 Taking one processor 1001 and one memory 1002 as an example.

[0084] The processor 1001 and the memory 1002 can be connected through a bus or other means. Figure 9 Taking the connection through the bus as an example.

[0085] The memory 1002, as a non-transitory computer-readable storage medium, can be used to store non-transitory software programs and non-transitory computer-executable programs. In addition, the memory 1002 may include high-speed random access memory, and may also include non-transitory memory, such as at least one magnetic disk storage device, a flash memory device, or other non-transitory solid-state storage devices. In some embodiments, the memory 1002 optionally includes a memory 1002 that is remotely disposed relative to the processor 1001, and these remote memories can be connected to the controller 1000 through a network. Examples of the above network include but are not limited to the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0086] Those skilled in the art can understand that Figure 9 the device structure shown in does not constitute a limitation on the controller 1000, and may include more or fewer components than shown, or combine certain components, or have different component arrangements.

[0087] The memory, as a non-transitory computer-readable storage medium, can be used to store non-transitory software programs and non-transitory computer-executable programs. In addition, the memory may include high-speed random access memory, and may also include non-transitory memory, such as at least one magnetic disk storage device, a flash memory device, or other non-transitory solid-state storage devices. In some embodiments, the memory optionally includes a memory that is remotely disposed relative to the processor, and these remote memories can be connected to the processor through a network. Examples of the above network include but are not limited to the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0088] The non-transitory software programs and instructions required to implement the temperature control method of the energy storage system in the above embodiments are stored in the memory, and when executed by the processor, the above embodiments are executed.

[0089] In some embodiments, the embodiments of the present application further provide an energy storage system, including Figure 9 the controller in, and the controller 1000 is used to execute the foregoing temperature control method.

[0090] It should be noted that since the energy storage system of the embodiments of the present application includes the controller of the above embodiments, therefore, the specific implementation manners and technical effects of the energy storage system of the embodiments of the present application can refer to the specific implementation manners and technical effects of the temperature control method of any one of the above embodiments, and will not be elaborated herein.

[0091] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separated, that is, they may be located in one place or distributed to multiple network nodes. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of the embodiments of the present application.

[0092] Those of ordinary skill in the art will understand that all or some of the steps and systems disclosed above can be implemented as software, firmware, hardware, and appropriate combinations thereof. Some physical components or all physical components can be implemented as software executed by a processor, such as a central processing unit, a digital signal processor, or a microprocessor, or as hardware, or as an integrated circuit, such as an application-specific integrated circuit. Such software can be distributed on a computer-readable medium, which can include a computer storage medium (or non-transitory medium) and a communication medium (or transitory medium). As is well known to those of ordinary skill in the art, the term computer storage medium includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information, such as computer-readable instructions, data structures, program modules, or other data. Computer storage media include, but are not limited to, RAM, ROM, EEPROM, flash memory or other memory technologies, CD-ROM, digital versatile disk (DVD) or other optical disk storage, magnetic cassettes, tapes, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to store the desired information and can be accessed by a computer. In addition, as is well known to those of ordinary skill in the art, a communication medium typically includes computer-readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transmission mechanism, and can include any information delivery medium.

[0093] It should be understood that in this application, "at least one (item)" means one or more, and "a plurality" means two or more. "And / or" is used to describe the association relationship of associated objects, indicating that there can be three relationships. For example, "A and / or B" can mean: only A exists, only B exists, and both A and B exist at the same time. Among them, A and B can be singular or plural. The character " / " generally means that the associated objects before and after are in an "or" relationship. "At least one (one) of the following" or a similar expression means any combination of these items, including any combination of single items (ones) or plural items (ones). For example, at least one (one) of a, b, or c can mean: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, c can be single or multiple.

[0094] In several embodiments provided by the present application, 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 example, the division of units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed couplings or direct couplings or communication connections between each other can be through some interfaces, indirect couplings or communication connections of apparatuses or units, and can be in electrical, mechanical, or other forms. The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they can be located in one place or distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiments of the present application.

[0095] It should also be understood that the various embodiments provided by the embodiments of the present application can be combined arbitrarily to achieve different technical effects.

[0096] The above is a specific description of the preferred embodiments of the present application, but the present application is not limited to the above embodiments. Those skilled in the art can also make various equivalent deformations or substitutions without departing from the spirit of the present application, and these equivalent deformations or substitutions are all included within the scope defined by the claims of the present application.

Claims

1. A temperature control method for an energy storage system, characterized in that: The energy storage system comprises at least two battery clusters, cooling pipes corresponding to the battery clusters, connecting pipes, valve assemblies and a liquid cooling unit, wherein the cooling pipes and the connecting pipes form a pipeline network and are connected to the liquid cooling unit, and the valve assembly is arranged in the pipeline network; the method comprises: Acquiring temperature values ​​of the battery clusters, and determining the battery cluster with the highest temperature value as a target battery cluster; The on / off state of the valve assembly is controlled to switch the liquid cooling circuit of the pipeline network, so that the coolant transported by the liquid cooling unit through the liquid cooling circuit first enters the cooling pipe corresponding to the target battery cluster.

2. The temperature control method according to claim 1, characterized in that: The energy storage system includes a first battery cluster and a second battery cluster, the cooling pipe includes a first cooling pipe corresponding to the first battery cluster and a second cooling pipe corresponding to the second battery cluster, the connecting pipe includes a first connecting pipe, a second connecting pipe and a third connecting pipe, one end of the first cooling pipe is connected to the liquid cooling unit through the first connecting pipe, the other end of the first cooling pipe is connected to one end of the second cooling pipe through the third connecting pipe, and the other end of the second cooling pipe is connected to the liquid cooling unit through the second connecting pipe.

3. The temperature control method according to claim 2, characterized in that: The valve assembly includes a first solenoid valve and a second solenoid valve, the first solenoid valve includes a first port, a second port and a third port, the second solenoid valve includes a fourth port, a fifth port and a sixth port, the first port and the fifth port are connected to the first cooling pipe through the first connecting pipe, the second port and the fourth port are connected to the second cooling pipe through the second connecting pipe, the third port is connected to the return pipe of the liquid cooling unit, and the sixth port is connected to the outlet pipe of the liquid cooling unit.

4. The temperature control method according to claim 3, characterized in that: The controlling the on / off state of the valve assembly to switch the liquid cooling circuit of the pipeline network includes: When the target battery cluster is the first battery cluster, the second port, the third port, the fifth port and the sixth port are opened, and the first port and the fourth port are closed to switch the liquid cooling circuit of the pipeline network.

5. The temperature control method according to claim 3, characterized in that: The controlling the on / off state of the valve assembly to switch the liquid cooling circuit of the pipeline network includes: When the target battery cluster is the second battery cluster, the first port, the third port, the fourth port and the sixth port are opened, and the second port and the fifth port are closed to switch the liquid cooling circuit of the pipeline network.

6. The temperature control method according to claim 1, characterized in that: The energy storage system includes a first battery cluster and a second battery cluster; the step of obtaining the temperature values ​​of the battery clusters and determining the battery cluster with the highest temperature value as the target battery cluster includes: acquiring a first temperature value of the first battery cluster and a second temperature value of the second battery cluster; When the first temperature value is greater than the second temperature value, determining the first battery cluster as a target battery cluster; When the first temperature value is less than the second temperature value, the second battery cluster is determined as a target battery cluster.

7. The temperature control method according to claim 6, characterized in that: The first battery cluster includes at least one first battery, and the second battery cluster includes at least one second battery; The obtaining a first temperature value of the first battery cluster and a second temperature value of the second battery cluster includes: Recording the temperature of each of the first batteries in the first battery cluster to obtain a first temperature set, and recording the temperature of each of the second batteries in the second battery cluster to obtain a second temperature set; A first temperature value is determined based on the first temperature set, and a second temperature value is determined based on the second temperature set.

8. The temperature control method according to claim 1, characterized in that: The acquiring the temperature values ​​of the battery clusters and determining the battery cluster with the highest temperature value as the target battery cluster includes: determining an operating status of each of the battery clusters; For the operating battery clusters, a battery cluster with the highest temperature among the operating battery clusters is determined as a target battery cluster.

9. A controller, characterized in that: comprising at least one processor and a memory for communicatively connecting to the at least one processor; The memory stores instructions that can be executed by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the temperature control method of the energy storage system as described in any one of claims 1 to 8.

10. An energy storage system, characterized in that: Comprising a controller as claimed in claim 9.

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