Energy-saving liquid-cooled energy storage method and system

Abstract

The present invention discloses an energy-saving liquid-cooled energy storage method and system. By real-time monitoring of individual liquid-cooled energy storage cabinets, stability index determination is performed on the liquid-cooled energy storage cabinets connected to the main line, and liquid-cooled energy storage cabinets with stability indexes greater than a preset first stability index threshold are removed from connection. The stability of the entire liquid-cooled energy storage cabinet is further balanced using the fluctuation rate. Each liquid-cooled energy storage cabinet is treated as an independent unit with the capabilities of energy storage and AC / DC power conversion. A liquid cooling system is configured to ensure safe, stable, and reliable long-term operation. While improving the energy storage effect of the liquid-cooled energy storage cabinet, energy loss during the conversion process is reduced by controlling the stable output of the liquid-cooled energy storage cabinet.

Description

Technical Field

[0001] The present invention relates to the field of liquid-cooled energy storage technology, and more specifically, to an energy-saving liquid-cooled energy storage method and system. Background Art

[0002] With the increasing penetration of renewable energy and the growing demand for power system flexibility, electrochemical energy storage technology has become a key support for building new power systems. Among them, energy storage systems based on lithium iron phosphate batteries occupy the mainstream market due to their advantages such as high energy density and long cycle life. However, in engineering applications, existing energy storage systems still have problems such as insufficient thermal management efficiency, limited balancing control accuracy, and passive lag in safety protection, which reduce the utilization rate of energy in the conversion process. Summary of the Invention

[0003] In order to solve at least one of the above technical problems, the purpose of the present invention is to provide an energy-saving liquid-cooled energy storage method and system, which reduces energy loss during the conversion process by controlling the stable output of the liquid-cooled energy storage cabinet.

[0004] A first aspect of the present invention provides an energy-saving liquid-cooled energy storage method, comprising:

[0005] Obtain monitoring data information of a single liquid-cooled energy storage cabinet;

[0006] According to the monitoring data information of the liquid-cooled energy storage cabinet, the stability index of the corresponding liquid-cooled energy storage cabinet is obtained;

[0007] If the stability index of the liquid-cooled energy storage cabinet is greater than the preset first stability index threshold, the corresponding liquid-cooled energy storage cabinet is abnormal, and the corresponding liquid-cooled energy storage cabinet is disconnected from the main line;

[0008] If the stability index of the liquid-cooled energy storage cabinet is less than or equal to the preset first stability index threshold, the corresponding liquid-cooled energy storage cabinet is normal;

[0009] After traversing all liquid-cooled energy storage cabinets, the stability index set of the liquid-cooled energy storage cabinets is obtained;

[0010] Extract the volatility of the stability index of a single liquid-cooled energy storage cabinet. If the volatility is less than the preset volatility threshold, the current liquid-cooled energy storage cabinet is normal.

[0011] The information that the current liquid-cooled energy storage cabinet is normal is sent to the preset management terminal for display.

[0012] In this solution, the step of obtaining the stability index of the corresponding liquid-cooled energy storage cabinet based on the monitoring data information of the liquid-cooled energy storage cabinet specifically includes:

[0013] Extract the temperature, voltage, and capacity values ​​from the monitoring data of a single liquid-cooled energy storage cabinet;

[0014] The temperature value, voltage value and capacity value are marked according to the corresponding collection time, and the temperature value, voltage value and capacity value of each time node are obtained;

[0015] The stability index of a single liquid-cooled energy storage cabinet is set to A, and its formula is:

[0016] ;in 、 and are the corresponding weight coefficients, 、 and Respectively represent the temperature value, voltage value and capacity value at the time node t+1, 、 and Represent the temperature value, voltage value and capacity value at time node t respectively, Represents the stability index of liquid-cooled energy storage cabinet i between time nodes t and t+1.

[0017] This plan also includes:

[0018] When the stability index of a single liquid-cooled energy storage cabinet is greater than the preset second stability index threshold, 、 and For comparative analysis, if is the largest, then judge Is it greater than zero? If If it is greater than zero, the cooling prompt message of the corresponding liquid-cooled energy storage cabinet will be triggered; if If it is less than zero, the heating prompt message of the corresponding liquid-cooled energy storage cabinet will be triggered;

[0019] The preset second stability index threshold is smaller than the preset first stability index threshold.

[0020] In this solution, after triggering the cooling prompt information of the corresponding liquid-cooled energy storage cabinet, the following steps are also included:

[0021] The preset coolant control valve is used to control the coolant to dissipate heat for the liquid-cooled energy storage cabinet. The coolant velocity is set to V, and the formula is: ,in is the heat loss power of a single liquid-cooled energy storage cabinet, is the contact resistance between the battery cell and the cold plate of a single liquid-cooled energy storage cabinet. Thermal conductivity of cold zone liquid, Coolant density, is the specific heat capacity of the coolant, S represents the cross-sectional area of ​​the cooling pipe, represents the time difference between time node t+1 and time node t, is the temperature difference between the liquid-cooled energy storage cabinet and the coolant at the current time node.

[0022] This plan also includes:

[0023] When the liquid-cooled energy storage cabinet is in the charging state, if If the value is less than or equal to zero, the corresponding liquid-cooled energy storage cabinet will be disconnected from the main line;

[0024] When the liquid-cooled energy storage cabinet is in the discharging state, if If it is greater than or equal to zero, the corresponding liquid-cooled energy storage cabinet will be disconnected from the main line.

[0025] In this solution, the step of extracting the volatility of the stability index concentration of the liquid-cooled energy storage cabinet specifically includes:

[0026] The stability index set of the liquid-cooled energy storage cabinet is averaged to obtain the average stability index;

[0027] Set the volatility of the stability index concentration of the liquid-cooled energy storage cabinet to , the formula is: , where n represents the total number of stability indices of the stability index concentration of a single liquid cooling energy storage cabinet, represents the stability index of a single liquid-cooled energy storage cabinet i, It represents the average stability index, m represents the stability index set of liquid cooling energy storage cabinets.

[0028] This plan also includes:

[0029] Get the output power of a single liquid-cooled energy storage cabinet;

[0030] The output power of a single liquid-cooled energy storage cabinet is marked according to the corresponding acquisition time to obtain the output power at different time nodes;

[0031] Based on the same time node, the output power of different liquid-cooled energy storage cabinets is averaged to obtain the average output power;

[0032] The output power of a single liquid-cooled energy storage cabinet is set to P, and its formula is: ,in represents the output power of liquid-cooled energy storage cabinet i at time node (t+1), represents the output power of liquid-cooled energy storage cabinet i at time node t, is the equalization coefficient, Represents the average output power of the current parallel liquid-cooled energy storage cabinet. When t is zero, is the initial output power of liquid-cooled energy storage cabinet i.

[0033] A second aspect of the present invention provides an energy-saving liquid-cooled energy storage system, including a memory and a processor. The memory stores an energy-saving liquid-cooled energy storage method program, and when the energy-saving liquid-cooled energy storage method program is executed by the processor, the following steps are implemented:

[0034] Obtain monitoring data information of a single liquid-cooled energy storage cabinet;

[0035] According to the monitoring data information of the liquid-cooled energy storage cabinet, the stability index of the corresponding liquid-cooled energy storage cabinet is obtained;

[0036] If the stability index of the liquid-cooled energy storage cabinet is greater than the preset first stability index threshold, the corresponding liquid-cooled energy storage cabinet is abnormal, and the corresponding liquid-cooled energy storage cabinet is disconnected from the main line;

[0037] If the stability index of the liquid-cooled energy storage cabinet is less than or equal to the preset first stability index threshold, the corresponding liquid-cooled energy storage cabinet is normal;

[0038] After traversing all liquid-cooled energy storage cabinets, the stability index set of the liquid-cooled energy storage cabinets is obtained;

[0039] Extract the volatility of the stability index of a single liquid-cooled energy storage cabinet. If the volatility is less than the preset volatility threshold, the current liquid-cooled energy storage cabinet is normal.

[0040] The information that the current liquid-cooled energy storage cabinet is normal is sent to the preset management terminal for display.

[0041] In this solution, the step of obtaining the stability index of the corresponding liquid-cooled energy storage cabinet based on the monitoring data information of the liquid-cooled energy storage cabinet specifically includes:

[0042] Extract the temperature, voltage, and capacity values ​​from the monitoring data of a single liquid-cooled energy storage cabinet;

[0043] The temperature value, voltage value and capacity value are marked according to the corresponding collection time, and the temperature value, voltage value and capacity value of each time node are obtained;

[0044] The stability index of a single liquid-cooled energy storage cabinet is set to A, and its formula is:

[0045] ;in 、 and are the corresponding weight coefficients, 、 and Respectively represent the temperature value, voltage value and capacity value at the time node t+1, 、 and Represent the temperature value, voltage value and capacity value at time node t respectively, Represents the stability index of liquid-cooled energy storage cabinet i between time nodes t and t+1.

[0046] This plan also includes:

[0047] When the stability index of a single liquid-cooled energy storage cabinet is greater than the preset second stability index threshold, 、 and For comparative analysis, if is the largest, then judge Is it greater than zero? If If it is greater than zero, the cooling prompt message of the corresponding liquid-cooled energy storage cabinet will be triggered; if If it is less than zero, the heating prompt message of the corresponding liquid-cooled energy storage cabinet will be triggered;

[0048] The preset second stability index threshold is smaller than the preset first stability index threshold.

[0049] The present invention discloses an energy-saving liquid-cooled energy storage method and system. By real-time monitoring of individual liquid-cooled energy storage cabinets, stability index determination is performed on the liquid-cooled energy storage cabinets connected to the main line, and liquid-cooled energy storage cabinets with stability indexes greater than a preset first stability index threshold are removed from connection. The stability of the entire liquid-cooled energy storage cabinet is further balanced using the fluctuation rate. Each liquid-cooled energy storage cabinet is treated as an independent unit with the capabilities of energy storage and AC / DC power conversion. A liquid cooling system is configured to ensure safe, stable, and reliable long-term operation. While improving the energy storage effect of the liquid-cooled energy storage cabinet, energy loss during the conversion process is reduced by controlling the stable output of the liquid-cooled energy storage cabinet. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 A flow chart of an energy-saving liquid-cooled energy storage method according to the present invention is shown;

[0051] Figure 2 A block diagram of an energy-saving liquid-cooled energy storage system of the present invention is shown. DETAILED DESCRIPTION

[0052] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, in the absence of conflict, the embodiments of the present application and the features therein can be combined with each other.

[0053] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0054] Figure 1A flow chart of an energy-saving liquid-cooled energy storage method of the present invention is shown.

[0055] S101, obtaining monitoring data information of a single liquid-cooled energy storage cabinet;

[0056] S102: Obtaining a stability index of the corresponding liquid-cooled energy storage cabinet based on monitoring data of the liquid-cooled energy storage cabinet;

[0057] S103: If the stability index of the liquid-cooled energy storage cabinet is greater than a preset first stability index threshold, the corresponding liquid-cooled energy storage cabinet is abnormal, and the corresponding liquid-cooled energy storage cabinet is disconnected from the main line;

[0058] S104: If the stability index of the liquid-cooled energy storage cabinet is less than or equal to a preset first stability index threshold, the corresponding liquid-cooled energy storage cabinet is normal;

[0059] S105, after traversing all liquid-cooled energy storage cabinets, obtain a stability index set of the liquid-cooled energy storage cabinets;

[0060] S106, extracting the volatility of the stability index concentration of the liquid-cooled energy storage cabinet. If the volatility is less than a preset volatility threshold, the current liquid-cooled energy storage cabinet is normal.

[0061] S107: Send the information that the current liquid-cooled energy storage cabinet is normal to a preset management terminal for display.

[0062] According to an embodiment of the present invention, a liquid-cooled energy storage cabinet is composed of multiple liquid-cooled energy storage cabinets connected in parallel, and each liquid-cooled energy storage cabinet is independently configured. A switch is provided in the parallel route of the liquid-cooled energy storage cabinet. When the stability index of a corresponding liquid-cooled energy storage cabinet is greater than a preset first stability index threshold, the corresponding switch disconnects the liquid-cooled energy storage cabinet in the parallel connection, thereby maintaining the stable output of the entire liquid-cooled energy storage cabinet. By controlling the stable output of the liquid-cooled energy storage cabinet, energy loss during the conversion process is reduced.

[0063] According to an embodiment of the present invention, the step of obtaining the stability index of the corresponding liquid-cooled energy storage cabinet based on the monitoring data information of the liquid-cooled energy storage cabinet specifically includes:

[0064] Extract the temperature, voltage, and capacity values ​​from the monitoring data of a single liquid-cooled energy storage cabinet;

[0065] The temperature value, voltage value and capacity value are marked according to the corresponding collection time, and the temperature value, voltage value and capacity value of each time node are obtained;

[0066] The stability index of a single liquid-cooled energy storage cabinet is set to A, and its formula is:

[0067] ;in 、 and are the corresponding weight coefficients, 、 and Respectively represent the temperature value, voltage value and capacity value at the time node t+1, 、 and Represent the temperature value, voltage value and capacity value at time node t respectively, Represents the stability index of liquid-cooled energy storage cabinet i between time nodes t and t+1.

[0068] It should be noted that during the operation of a liquid-cooled energy storage cabinet, if the temperature difference, voltage difference or capacity difference between two different time points is larger, it means that there are unstable factors between the corresponding liquid-cooled energy storage cabinet at the two different time nodes, and the larger the stability index of the corresponding liquid-cooled energy storage cabinet at the two different time nodes, the smaller the stability index, the more stable the corresponding liquid-cooled energy storage cabinet.

[0069] According to an embodiment of the present invention, the further embodiment includes:

[0070] When the stability index of a single liquid-cooled energy storage cabinet is greater than the preset second stability index threshold, 、 and For comparative analysis, if is the largest, then judge Is it greater than zero? If If it is greater than zero, the cooling prompt message of the corresponding liquid-cooled energy storage cabinet will be triggered; if If it is less than zero, the heating prompt message of the corresponding liquid-cooled energy storage cabinet will be triggered;

[0071] The preset second stability index threshold is smaller than the preset first stability index threshold.

[0072] It should be noted that when When it is the maximum, it means that the factor causing the current stability index to be greater than the preset second stability index threshold is the temperature difference. When it is greater than zero, it means that the temperature of the current liquid-cooled energy storage cabinet is rising too fast, so the cooling effect is triggered through the cooling prompt; when When it is less than zero, it means that the temperature of the current liquid-cooled energy storage cabinet is dropping too fast, so the heating effect is triggered through the heating prompt message.

[0073] Furthermore, when the liquid-cooled energy storage cabinet is cooled by the coolant, the corresponding liquid-cooled energy storage cabinet When the stability index is greater than the preset second stability index threshold, Revise the current coolant flow rate. The revised flow rate , where V represents the flow rate of the coolant when the liquid-cooled energy storage cabinet is cooled by the coolant. The allowable temperature difference set for a single liquid-cooled energy storage cabinet.

[0074] According to an embodiment of the present invention, after triggering the cooling prompt information corresponding to the liquid-cooled energy storage cabinet, the method further includes:

[0075] The preset coolant control valve is used to control the coolant to dissipate heat for the liquid-cooled energy storage cabinet. The coolant velocity is set to V, and the formula is: ,in is the heat loss power of a single liquid-cooled energy storage cabinet, is the contact resistance between the battery cell and the cold plate of a single liquid-cooled energy storage cabinet. Thermal conductivity of cold zone liquid, Coolant density, is the specific heat capacity of the coolant, S represents the cross-sectional area of ​​the cooling pipe, represents the time difference between time node t+1 and time node t, is the temperature difference between the liquid-cooled energy storage cabinet and the coolant at the current time node.

[0076] It should be noted that the greater the temperature difference between the liquid-cooled energy storage cabinet and the coolant at the current time node, the smaller the corresponding coolant speed.

[0077] According to an embodiment of the present invention, the further embodiment includes:

[0078] When the liquid-cooled energy storage cabinet is in the charging state, if If the value is less than or equal to zero, the corresponding liquid-cooled energy storage cabinet will be disconnected from the main line;

[0079] When the liquid-cooled energy storage cabinet is in the discharging state, if If it is greater than or equal to zero, the corresponding liquid-cooled energy storage cabinet will be disconnected from the main line.

[0080] It should be noted that when the liquid-cooled energy storage cabinet is in the charging state, if If the value is less than or equal to zero, it means that the current liquid cooling energy storage cabinet is discharging, so the corresponding liquid cooling energy storage cabinet will be disconnected; when the liquid cooling energy storage cabinet is in the discharging state, if If it is greater than or equal to zero, it means that the current liquid-cooled energy storage cabinet is charging, so the corresponding liquid-cooled energy storage cabinet will be disconnected.

[0081] According to an embodiment of the present invention, the step of extracting the volatility of the stability index concentration of the liquid-cooled energy storage cabinet specifically includes:

[0082] The stability index set of the liquid-cooled energy storage cabinet is averaged to obtain the average stability index;

[0083] Set the volatility of the stability index concentration of the liquid-cooled energy storage cabinet to , the formula is: , where n represents the total number of stability indices of the stability index concentration of a single liquid cooling energy storage cabinet, represents the stability index of a single liquid-cooled energy storage cabinet i, It represents the average stability index, m represents the stability index set of liquid cooling energy storage cabinets.

[0084] It should be noted that by controlling the fluctuation rate of the entire liquid-cooled energy storage cabinet, the stable output or energy storage of the entire liquid-cooled energy storage cabinet is improved, and the energy consumption between energy conversions is reduced.

[0085] According to an embodiment of the present invention, the further embodiment includes:

[0086] Get the output power of a single liquid-cooled energy storage cabinet;

[0087] The output power of a single liquid-cooled energy storage cabinet is marked according to the corresponding acquisition time to obtain the output power at different time nodes;

[0088] Based on the same time node, the output power of different liquid-cooled energy storage cabinets is averaged to obtain the average output power;

[0089] The output power of a single liquid-cooled energy storage cabinet is set to P, and its formula is: ,in represents the output power of liquid-cooled energy storage cabinet i at time node (t+1), represents the output power of liquid-cooled energy storage cabinet i at time node t, is the equalization coefficient, Represents the average output power of the current parallel liquid-cooled energy storage cabinet. When t is zero, is the initial output power of liquid-cooled energy storage cabinet i.

[0090] It should be noted that after obtaining the average output power, the output power of the liquid-cooled energy storage cabinet and the average output power are calculated to obtain the output power difference of the corresponding liquid-cooled energy storage cabinet. If the output power difference of the corresponding liquid-cooled energy storage cabinet is greater than the preset output power difference threshold, the output power of the corresponding liquid-cooled energy storage cabinet needs to be adjusted. If the output power difference of the corresponding liquid-cooled energy storage cabinet is less than or equal to the preset output power difference threshold, the output power of the corresponding liquid-cooled energy storage cabinet does not need to be adjusted. The initial output power of the liquid-cooled energy storage cabinet is determined based on the total output power of the entire liquid-cooled energy storage cabinet. The total output power of the entire liquid-cooled energy storage cabinet is divided by the number of liquid-cooled energy storage cabinets in parallel to obtain the initial output power of the liquid-cooled energy storage cabinet in parallel. The output power of the liquid-cooled energy storage cabinet is less than or equal to the maximum output power of the corresponding liquid-cooled energy storage cabinet.

[0091] Furthermore, when there is an output power adjustment of a liquid-cooled energy storage cabinet, the corresponding liquid-cooled energy storage cabinet is set to actively adjust the liquid-cooled energy storage cabinet, and the power adjustment value is , Indicates the output power after active adjustment of the liquid-cooled energy storage cabinet. Indicates the output power of the liquid-cooled energy storage cabinet before active adjustment, and then compares and analyzes the absolute value of the corresponding power adjustment value with the preset output power difference threshold. If the absolute value of the power adjustment value is less than or equal to the preset output power difference threshold, a passively adjusted liquid-cooled energy storage cabinet is extracted; if the absolute value of the power adjustment value is greater than the preset output power difference threshold, the preset output power difference threshold is subtracted from the absolute value of the power adjustment value to obtain a first difference, and then compared with the preset output power difference threshold. If the first difference is less than or equal to the preset output power difference threshold, two passively adjusted liquid-cooled energy storage cabinets are extracted. If the first difference is greater than the preset output power difference threshold, the comparison is continued, and so on, until the Nth difference is less than or equal to the preset output power difference threshold, and N+1 passively adjusted liquid-cooled energy storage cabinets are extracted; when the output power of the actively adjusted liquid-cooled energy storage cabinet increases, the average output power is subtracted from the output power of the remaining liquid-cooled energy storage cabinets in sequence, and the liquid-cooled energy storage cabinets are The cabinets are arranged in order of power difference from small to large, and N+1 liquid-cooled energy storage cabinets are extracted and set as passively adjusted liquid-cooled energy storage cabinets. Except for the power adjustment value of the last passively adjusted liquid-cooled energy storage cabinet in the sorting, which is the Nth difference, the power adjustment values ​​of the other passively adjusted liquid-cooled energy storage cabinets are the preset output power difference threshold. The output power of the dynamically adjusted liquid-cooled energy storage cabinet after adjustment is the current output power minus the power adjustment value. When the output power of the actively adjusted liquid-cooled energy storage cabinet is adjusted down, the output power of the remaining liquid-cooled energy storage cabinets is subtracted from the average output power in sequence. The liquid-cooled energy storage cabinets are arranged in order of power difference from large to small, and N+1 liquid-cooled energy storage cabinets are extracted and set as passively adjusted liquid-cooled energy storage cabinets. Except for the power adjustment value of the last passively adjusted liquid-cooled energy storage cabinet in the sorting, which is the Nth difference, the power adjustment values ​​of the other passively adjusted liquid-cooled energy storage cabinets are the preset output power difference threshold. The output power of the dynamically adjusted liquid-cooled energy storage cabinet after adjustment is the current output power plus the power adjustment value.

[0092] Furthermore, when a liquid-cooled energy storage cabinet is disconnected, the output power of the disconnected liquid-cooled energy storage cabinet is evenly distributed to the parallel liquid-cooled energy storage cabinets, and the output power of each liquid-cooled energy storage cabinet is re-obtained. If the output power of the liquid-cooled energy storage cabinet is greater than the maximum output power of the corresponding liquid-cooled energy storage cabinet, the output power of the corresponding liquid-cooled energy storage cabinet is the maximum output power. When the output power of all liquid-cooled energy storage cabinets is the maximum output power and the total output power of the entire liquid-cooled energy storage cabinet is less than the set total output power, the corresponding liquid-cooled energy storage cabinet is disconnected and a warning message is triggered to prompt the preset management terminal to perform detection.

[0093] Furthermore, when there is a backup liquid-cooled energy storage cabinet, when one liquid-cooled energy storage cabinet is disconnected, the corresponding backup liquid-cooled energy storage cabinet is connected in parallel to the liquid-cooled energy storage cabinet, and the output power of the backup liquid-cooled energy storage cabinet replaces the output power of the disconnected liquid-cooled energy storage cabinet. The output power of other liquid-cooled energy storage cabinets does not need to be shared with the output power of the disconnected liquid-cooled energy storage cabinet; when the disconnected liquid-cooled energy storage cabinet is set to normal, the corresponding disconnected liquid-cooled energy storage cabinet is set as a backup liquid-cooled energy storage cabinet.

[0094] Figure 2 A block diagram of an energy-saving liquid-cooled energy storage system of the present invention is shown.

[0095] like Figure 2 As shown, the second aspect of the present invention provides an energy-saving liquid-cooled energy storage system 2, including a memory 21 and a processor 22, wherein the memory stores an energy-saving liquid-cooled energy storage method program, and when the energy-saving liquid-cooled energy storage method program is executed by the processor, the following steps are implemented:

[0096] Obtain monitoring data information of a single liquid-cooled energy storage cabinet;

[0097] According to the monitoring data information of the liquid-cooled energy storage cabinet, the stability index of the corresponding liquid-cooled energy storage cabinet is obtained;

[0098] If the stability index of the liquid-cooled energy storage cabinet is greater than the preset first stability index threshold, the corresponding liquid-cooled energy storage cabinet is abnormal, and the corresponding liquid-cooled energy storage cabinet is disconnected from the main line;

[0099] If the stability index of the liquid-cooled energy storage cabinet is less than or equal to the preset first stability index threshold, the corresponding liquid-cooled energy storage cabinet is normal;

[0100] After traversing all liquid-cooled energy storage cabinets, the stability index set of the liquid-cooled energy storage cabinets is obtained;

[0101] Extract the volatility of the stability index of a single liquid-cooled energy storage cabinet. If the volatility is less than the preset volatility threshold, the current liquid-cooled energy storage cabinet is normal.

[0102] The information that the current liquid-cooled energy storage cabinet is normal is sent to the preset management terminal for display.

[0103] In this solution, the step of obtaining the stability index of the corresponding liquid-cooled energy storage cabinet based on the monitoring data information of the liquid-cooled energy storage cabinet specifically includes:

[0104] Extract the temperature, voltage, and capacity values ​​from the monitoring data of a single liquid-cooled energy storage cabinet;

[0105] The temperature value, voltage value and capacity value are marked according to the corresponding collection time, and the temperature value, voltage value and capacity value of each time node are obtained;

[0106] The stability index of a single liquid-cooled energy storage cabinet is set to A, and its formula is:

[0107] ;in 、 and are the corresponding weight coefficients, 、 and Respectively represent the temperature value, voltage value and capacity value at the time node t+1, 、 and Represent the temperature value, voltage value and capacity value at time node t respectively, Represents the stability index of liquid-cooled energy storage cabinet i between time nodes t and t+1.

[0108] This plan also includes:

[0109] When the stability index of a single liquid-cooled energy storage cabinet is greater than the preset second stability index threshold, 、 and For comparative analysis, if is the largest, then judge Is it greater than zero? If If it is greater than zero, the cooling prompt message of the corresponding liquid-cooled energy storage cabinet will be triggered; if If it is less than zero, the heating prompt message of the corresponding liquid-cooled energy storage cabinet will be triggered;

[0110] The preset second stability index threshold is smaller than the preset first stability index threshold.

[0111] The present invention discloses an energy-saving liquid-cooled energy storage method and system. By real-time monitoring of individual liquid-cooled energy storage cabinets, stability index determination is performed on the liquid-cooled energy storage cabinets connected to the main line, and liquid-cooled energy storage cabinets with stability indexes greater than a preset first stability index threshold are removed from connection. The stability of the entire liquid-cooled energy storage cabinet is further balanced using the fluctuation rate. Each liquid-cooled energy storage cabinet is treated as an independent unit with the capabilities of energy storage and AC / DC power conversion. A liquid cooling system is configured to ensure safe, stable, and reliable long-term operation. While improving the energy storage effect of the liquid-cooled energy storage cabinet, energy loss during the conversion process is reduced by controlling the stable output of the liquid-cooled energy storage cabinet.

[0112] In the several embodiments provided in this application, it should be understood that the disclosed devices and methods can be implemented in other ways. The device embodiments described above are merely schematic. For example, the division of the units is merely a logical function division. In actual implementation, there may be other division methods, such as: multiple units or components can be combined, or can be integrated into another system, or some features can be ignored or not executed. In addition, the coupling, direct coupling, or communication connection between the components shown or discussed can be through some interfaces, and the indirect coupling or communication connection of the devices or units can be electrical, mechanical or other forms.

[0113] The units described above as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units; they may be located in one place or distributed across multiple network units; some or all of the units may be selected according to actual needs to achieve the purpose of the scheme of this embodiment.

[0114] In addition, all functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may be separately used as a unit, or two or more units may be integrated into one unit; the above-mentioned integrated units may be implemented in the form of hardware or in the form of hardware plus software functional units.

[0115] Those skilled in the art will appreciate that all or part of the steps of the above-mentioned method embodiments may be implemented by hardware associated with program instructions, and the aforementioned program may be stored in a computer-readable storage medium. When the program is executed, the program executes the steps of the above-mentioned method embodiments. The aforementioned storage medium includes various media that can store program codes, such as mobile storage devices, read-only memories (ROMs), random access memories (RAMs), magnetic disks, or optical disks.

[0116] Alternatively, if the integrated units described above are implemented as software modules and sold or used as standalone products, they can also be stored on a computer-readable storage medium. Based on this understanding, the technical solutions of the embodiments of the present invention, or the portion that contributes to the prior art, can be embodied in the form of a software product. This computer software product, stored on a storage medium, includes instructions for enabling a computer device (such as a personal computer, server, or network device) to execute all or part of the methods described in various embodiments of the present invention. The aforementioned storage media include various media capable of storing program code, such as removable storage devices, ROM, RAM, magnetic disks, or optical disks.

Claims

1. An energy-saving liquid cooling energy storage method, characterized in that: include: Obtain monitoring data information of a single liquid-cooled energy storage cabinet; According to the monitoring data information of the liquid-cooled energy storage cabinet, the stability index of the corresponding liquid-cooled energy storage cabinet is obtained; If the stability index of the liquid-cooled energy storage cabinet is greater than the preset first stability index threshold, the corresponding liquid-cooled energy storage cabinet is abnormal, and the corresponding liquid-cooled energy storage cabinet is disconnected from the main line; If the stability index of the liquid-cooled energy storage cabinet is less than or equal to the preset first stability index threshold, the corresponding liquid-cooled energy storage cabinet is normal; After traversing all liquid-cooled energy storage cabinets, the stability index set of the liquid-cooled energy storage cabinets is obtained; Extract the volatility of the stability index of a single liquid-cooled energy storage cabinet. If the volatility is less than the preset volatility threshold, the current liquid-cooled energy storage cabinet is normal. Send the information that the current liquid-cooled energy storage cabinet is normal to the preset management terminal for display; The step of obtaining the stability index of the corresponding liquid-cooled energy storage cabinet based on the monitoring data information of the liquid-cooled energy storage cabinet specifically includes: Extract the temperature, voltage, and capacity values ​​from the monitoring data of a single liquid-cooled energy storage cabinet; The temperature value, voltage value and capacity value are marked according to the corresponding collection time, and the temperature value, voltage value and capacity value of each time node are obtained; The stability index of a single liquid-cooled energy storage cabinet is set to A, and its formula is: A i (t+1)=k1*|T t+1 -T t |+k2*|V t+1 -V t |+k3*|Q t+1 -Q t |; Where k1, k2 and k3 are the corresponding weight coefficients, T t+1 、V t+1 and Q t+1 Represent the temperature value, voltage value and capacity value at the time node t+1, T t 、V t and Q t Represent the temperature value, voltage value and capacity value at time node t respectively, A i (t+1) represents the stability index of the liquid-cooled energy storage cabinet i between time nodes t and t+1; The step of extracting the volatility of the stability index concentration of the liquid-cooled energy storage cabinet specifically includes: The stability index set of the liquid-cooled energy storage cabinet is averaged to obtain the average stability index; The volatility of the stability index concentration of a single liquid-cooled energy storage cabinet is set to η, and its formula is: Where n represents the total number of stability indexes of the liquid cooling energy storage cabinet, A i represents the stability index of a single liquid-cooled energy storage cabinet i, represents the average stability index, and m represents the set of stability indices of a single liquid-cooled energy storage cabinet.

2. An energy-saving liquid-cooled energy storage method according to claim 1, characterized in that: Also includes: When the stability index of the liquid-cooled energy storage cabinet is greater than the preset second stability index threshold, k1*|T t+1 -T t |、k2*|V t+1 -V t | and k3*|Q t+1 -Q t |For comparative analysis, if k1*|T t+1 -T t | is the largest, then judge T t+1 -T t Is it greater than zero? If T t+1 -T t If T is greater than zero, the cooling prompt message of the corresponding liquid-cooled energy storage cabinet will be triggered; if T t+1 -T t If it is less than zero, the heating prompt message of the corresponding liquid-cooled energy storage cabinet will be triggered; The preset second stability index threshold is smaller than the preset first stability index threshold.

3. The energy-saving liquid-cooled energy storage method according to claim 2, characterized in that: After triggering the cooling prompt information of the corresponding liquid-cooled energy storage cabinet, the method further includes: The preset coolant control valve is used to control the coolant to dissipate heat for the liquid-cooled energy storage cabinet. The coolant velocity is set to V, and the formula is: Where P is the heat loss power of a single liquid-cooled energy storage cabinet, R z k is the contact resistance between the cell and the cold plate of a single liquid-cooled energy storage cabinet, c Coolant thermal conductivity, ρ Coolant density, C p is the specific heat capacity of the coolant, S represents the cross-sectional area of ​​the cooling pipe, Δt represents the time difference between time node t+1 and time node t, and ΔT is the temperature difference between the liquid-cooled energy storage cabinet and the coolant at the current time node.

4. An energy-saving liquid cooling energy storage method according to claim 1, characterized in that: Also includes: When the liquid-cooled energy storage cabinet is in the charging state, if Q t+1 -Q t If the value is less than or equal to zero, the corresponding liquid-cooled energy storage cabinet will be disconnected from the main line; When the liquid-cooled energy storage cabinet is in the discharge state, if Q t+1 -Q t If it is greater than or equal to zero, the corresponding liquid-cooled energy storage cabinet will be disconnected from the main line.

5. The energy-saving liquid-cooled energy storage method according to claim 1, characterized in that: Also includes: Get the output power of a single liquid-cooled energy storage cabinet; The output power of a single liquid-cooled energy storage cabinet is marked according to the corresponding acquisition time to obtain the output power at different time nodes; Based on the same time node, the output power of different liquid-cooled energy storage cabinets is averaged to obtain the average output power; The output power of a single liquid-cooled energy storage cabinet is set to P, and its formula is: Among them, P i (t+1) represents the output power of liquid-cooled energy storage cabinet i at time node t+1, P i (t) represents the output power of liquid-cooled energy storage cabinet i at time node t, w is the balancing coefficient, Represents the average output power of the current parallel liquid-cooled energy storage cabinet. When t is zero, P i (t) is the initial output power of liquid-cooled energy storage cabinet i.

6. An energy-saving liquid-cooled energy storage system, characterized in that: The system comprises a memory and a processor, wherein the memory stores an energy-saving liquid-cooled energy storage method program, and when the energy-saving liquid-cooled energy storage method program is executed by the processor, the following steps are implemented: Obtain monitoring data information of a single liquid-cooled energy storage cabinet; According to the monitoring data information of the liquid-cooled energy storage cabinet, the stability index of the corresponding liquid-cooled energy storage cabinet is obtained; If the stability index of the liquid-cooled energy storage cabinet is greater than the preset first stability index threshold, the corresponding liquid-cooled energy storage cabinet is abnormal, and the corresponding liquid-cooled energy storage cabinet is disconnected from the main line; If the stability index of the liquid-cooled energy storage cabinet is less than or equal to the preset first stability index threshold, the corresponding liquid-cooled energy storage cabinet is normal; After traversing all liquid-cooled energy storage cabinets, the stability index set of the liquid-cooled energy storage cabinets is obtained; Extract the volatility of the stability index of a single liquid-cooled energy storage cabinet. If the volatility is less than the preset volatility threshold, the current liquid-cooled energy storage cabinet is normal. Send the information that the current liquid-cooled energy storage cabinet is normal to the preset management terminal for display; The step of obtaining the stability index of the corresponding liquid-cooled energy storage cabinet based on the monitoring data information of the liquid-cooled energy storage cabinet specifically includes: Extract the temperature, voltage, and capacity values ​​from the monitoring data of a single liquid-cooled energy storage cabinet; The temperature value, voltage value and capacity value are marked according to the corresponding collection time, and the temperature value, voltage value and capacity value of each time node are obtained; The stability index of a single liquid-cooled energy storage cabinet is set to A, and its formula is: A i (t+1)=k1*|T t+1 -T t |+k2*|V t+1 -V t |+k3*|Q t+1 -Q t |; Where k1, k2 and k3 are the corresponding weight coefficients, T t+1 、V t+1 and Q t+1 Represent the temperature value, voltage value and capacity value at the time node t+1, T t 、V t and Q t Represent the temperature value, voltage value and capacity value at time node t respectively, A i (t+1) represents the stability index of the liquid-cooled energy storage cabinet i between time nodes t and t+1; The step of extracting the volatility of the stability index concentration of the liquid-cooled energy storage cabinet specifically includes: The stability index set of the liquid-cooled energy storage cabinet is averaged to obtain the average stability index; The volatility of the stability index concentration of a single liquid-cooled energy storage cabinet is set to η, and its formula is: Where n represents the total number of stability indexes of the liquid cooling energy storage cabinet, A i represents the stability index of a single liquid-cooled energy storage cabinet i, represents the average stability index, and m represents the set of stability indices of a single liquid-cooled energy storage cabinet.

7. An energy-saving liquid-cooled energy storage system according to claim 6, characterized in that: Also includes: When the stability index of the liquid-cooled energy storage cabinet is greater than the preset second stability index threshold, k1*|T t+1 -T t |、k2*|V t+1 -V t | and k3*|Q t+1 -Q t |For comparative analysis, if k1*|T t+1 -T t | is the largest, then judge T t+1 -T t Is it greater than zero? If T t+1 -T t If T is greater than zero, the cooling prompt message of the corresponding liquid-cooled energy storage cabinet will be triggered; if T t+1 -T t If it is less than zero, the heating prompt message of the corresponding liquid-cooled energy storage cabinet will be triggered; The preset second stability index threshold is smaller than the preset first stability index threshold.

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