Energy-saving liquid cooling energy storage method and system

Abstract

According to the energy-saving liquid-cooling energy storage method and system disclosed by the invention, the liquid-cooling energy storage single cabinets are monitored in real time, the stability indexes of the liquid-cooling energy storage single cabinets connected to the main line are judged, and the liquid-cooling energy storage single cabinets with the stability indexes larger than the preset first stability index threshold value are taken out and connected; the stability of the whole liquid-cooled energy storage cabinet is further balanced through the volatility, each liquid-cooled energy storage single cabinet is an independent single body and has the capacity of energy storage and alternating-current and direct-current power conversion, a liquid-cooled system is configured, safe, stable and reliable long-term operation can be achieved, and the energy storage effect of the liquid-cooled energy storage cabinet is improved; by controlling the stable output of the liquid cooling energy storage cabinet, the loss of energy in the conversion process is reduced.

Description

Technical Field

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

[0002] With the improvement of the penetration rate of renewable energy and the increasing demand for the flexibility of the power system, electrochemical energy storage technology has become a key support for building a new power system; among them, energy storage systems based on lithium iron phosphate batteries occupy the mainstream market due to 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 accuracy of equalization control, and passive and lagging safety protection, reducing the utilization rate of energy during the conversion process. Summary of the Invention

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

[0004] The first aspect of the present invention provides an energy-saving liquid-cooled energy storage method, including: Obtaining the monitoring data information of a single liquid-cooled energy storage cabinet; According to the monitoring data information of the single liquid-cooled energy storage cabinet, obtaining the stability index of the corresponding single liquid-cooled energy storage cabinet; If the stability index of the single liquid-cooled energy storage cabinet is greater than a preset first stability index threshold, the corresponding single liquid-cooled energy storage cabinet is abnormal, and the corresponding single liquid-cooled energy storage cabinet is disconnected from the main line; If the stability index of the single liquid-cooled energy storage cabinet is less than or equal to the preset first stability index threshold, the corresponding single liquid-cooled energy storage cabinet is normal; After traversing all single liquid-cooled energy storage cabinets, obtaining the stability index set of the single liquid-cooled energy storage cabinets; Extracting the volatility in the stability index set of the single liquid-cooled energy storage cabinets, if the volatility is less than a preset volatility threshold, the current liquid-cooled energy storage cabinet is normal information; Sending the information that the current liquid-cooled energy storage cabinet is normal to a preset management terminal for display.

[0005] In this solution, the step of obtaining the stability index of the corresponding single liquid-cooled energy storage cabinet according to the monitoring data information of the single liquid-cooled energy storage cabinet specifically includes: Extracting the temperature value, voltage value and capacity value in the monitoring data information of the single liquid-cooled energy storage cabinet; Identifying the temperature value, voltage value and capacity value according to the corresponding acquisition time respectively, to obtain the temperature value, voltage value and capacity value at each time node; Setting the stability index of the single liquid-cooled energy storage cabinet as A, and its formula is: ; among which 、 and are the corresponding weight coefficients respectively, 、 and represent the temperature value, voltage value and capacity value at time node t + 1 respectively, 、 and represent the temperature value, voltage value and capacity value at time node t respectively, represents the stability index of the liquid-cooled energy storage single cabinet i between time nodes t and t + 1.

[0006] In this solution, it also includes: When the stability index of the liquid-cooled energy storage single cabinet is greater than the preset second stability index threshold, compare 、 and analytically. If is the largest, then determine whether is greater than zero. If is greater than zero, then trigger the cooling prompt information for the corresponding liquid-cooled energy storage single cabinet; if is less than zero, then trigger the heating prompt information for the corresponding liquid-cooled energy storage single cabinet; The preset second stability index threshold is less than the preset first stability index threshold.

[0007] In this solution, after triggering the cooling prompt information for the corresponding liquid-cooled energy storage single cabinet, it also includes: Control the coolant to dissipate heat from the liquid-cooled energy storage single cabinet through the preset coolant control valve. The speed of the coolant is set to V, and the formula is , among which is the heat loss power of the liquid-cooled energy storage single cabinet, is the contact resistance between the battery cell and the cold plate of the liquid-cooled energy storage single cabinet, is the thermal conductivity of the liquid in the cold area, is the density of the coolant, is the specific heat capacity of the coolant. S represents the cross-sectional area of the cooling pipe, represents the time difference between time nodes t + 1 and t, is the temperature difference between the liquid-cooled energy storage single cabinet and the coolant at the current time node.

[0008] In this solution, it also includes: When the liquid-cooled energy storage single cabinet is in the charging state, if is less than or equal to zero, then disconnect the corresponding liquid-cooled energy storage single cabinet from the main line; When the liquid-cooled energy storage single cabinet is in the discharging state, if is greater than or equal to zero, then disconnect the corresponding liquid-cooled energy storage single cabinet from the main line.

[0009] In this solution, the steps of extracting the volatility of the stability index set of a single liquid-cooled energy storage cabinet specifically include: Calculate the mean of the stability index set of the single liquid-cooled energy storage cabinet to obtain the average stability index; Set the volatility in the stability index set of the single liquid-cooled energy storage cabinet as , and its formula is: , where n represents the total number of stability indices in the stability index set of the single liquid-cooled energy storage cabinet, represents the stability index of the i-th single liquid-cooled energy storage cabinet, represents the average stability index, and m is the stability index set of the single liquid-cooled energy storage cabinet.

[0010] In this solution, it also includes: Obtain the output power of the single liquid-cooled energy storage cabinet; Identify the output power of the single liquid-cooled energy storage cabinet according to the corresponding collected time to obtain the output power at different time nodes; Based on the same time node, calculate the mean of the output powers of different single liquid-cooled energy storage cabinets to obtain the average output power; Set the output power of the single liquid-cooled energy storage cabinet as P, and its formula is , where represents the output power of the i-th single liquid-cooled energy storage cabinet at the time node (t + 1), represents the output power of the i-th single liquid-cooled energy storage cabinet at the time node t, is the balance coefficient, represents the average output power of the currently paralleled single liquid-cooled energy storage cabinets. When t is zero, is the initial output power of the i-th single liquid-cooled energy storage cabinet.

[0011] The second aspect of the present invention provides an energy-saving liquid-cooled energy storage system, including a memory and a processor. An energy-saving liquid-cooled energy storage method program is stored in the memory. When the energy-saving liquid-cooled energy storage method program is executed by the processor, the following steps are implemented: Obtain the monitoring data information of the single liquid-cooled energy storage cabinet; According to the monitoring data information of the single liquid-cooled energy storage cabinet, obtain the corresponding stability index of the single liquid-cooled energy storage cabinet; If the stability index of the single liquid-cooled energy storage cabinet is greater than the preset first stability index threshold, the corresponding single liquid-cooled energy storage cabinet is abnormal, and the corresponding single liquid-cooled energy storage cabinet is disconnected from the main line; If the stability index of the single liquid-cooled energy storage cabinet is less than or equal to the preset first stability index threshold, the corresponding single liquid-cooled energy storage cabinet is normal; After traversing all single liquid-cooled energy storage cabinets, obtain the stability index set of the single liquid-cooled energy storage cabinets; Extract the volatility in the concentration 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 has normal information; Send the information that the current liquid-cooled energy storage cabinet has normal information to a preset management terminal for display.

[0012] In this solution, the step of obtaining the stability index of the corresponding liquid-cooled energy storage single cabinet according to the monitoring data information of the liquid-cooled energy storage single cabinet specifically includes: Extract the temperature value, voltage value, and capacity value from the monitoring data information of the liquid-cooled energy storage single cabinet; Identify the temperature value, voltage value, and capacity value according to the corresponding acquisition time respectively, and obtain the temperature value, voltage value, and capacity value at each time node; Set the stability index of the liquid-cooled energy storage single cabinet as A, and its formula is: ; where 、 and are the corresponding weight coefficients respectively, 、 and represent the temperature value, voltage value, and capacity value at time node t + 1 respectively, 、 and represent the temperature value, voltage value, and capacity value at time node t respectively, represents the stability index of the liquid-cooled energy storage single cabinet i between time nodes t and t + 1.

[0013] In this solution, it also includes: When the stability index of the liquid-cooled energy storage single cabinet is greater than the preset second stability index threshold, compare 、 and If is the largest, then judge whether is greater than zero. If is greater than zero, then trigger the cooling prompt information for the corresponding liquid-cooled energy storage single cabinet; if is less than zero, then trigger the heating prompt information for the corresponding liquid-cooled energy storage single cabinet; The preset second stability index threshold is less than the preset first stability index threshold.

[0014] An energy-saving liquid-cooled energy storage method and system disclosed by the present invention monitors the liquid-cooled energy storage single cabinet in real time, determines the stability index of the liquid-cooled energy storage single cabinet connected to the main line, and removes the liquid-cooled energy storage single cabinet with a stability index greater than the preset first stability index threshold from the connection. Then, the stability of the entire liquid-cooled energy storage cabinet is further balanced through the volatility. Each liquid-cooled energy storage single cabinet is an independent monomer, with the ability of energy storage and AC / DC power conversion, and is equipped with a liquid-cooling system, which can operate safely, stably and reliably for a long time. While improving the energy storage effect of the liquid-cooled energy storage cabinet, by controlling the stable output of the liquid-cooled energy storage cabinet, the loss of energy during the conversion process is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 The flowchart of an energy-saving liquid-cooled energy storage method of the present invention is shown; Figure 2 The block diagram of an energy-saving liquid-cooled energy storage system of the present invention is shown. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0016] In order to more clearly understand the above objects, features and advantages of the present invention, the present invention will be further described in detail below with reference to the drawings and specific embodiments. It should be noted that, without conflict, the embodiments of the present application and the features in the embodiments can be combined with each other.

[0017] In the following description, many specific details are set forth in order to fully understand the present invention. However, the present invention can also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited by the specific embodiments disclosed below.

[0018] Figure 1 The flowchart of an energy-saving liquid-cooled energy storage method of the present invention is shown.

[0019] S101, Obtain the monitoring data information of the liquid-cooled energy storage single cabinet; S102, Obtain the stability index of the corresponding liquid-cooled energy storage single cabinet according to the monitoring data information of the liquid-cooled energy storage single cabinet; S103, If the stability index of the liquid-cooled energy storage single cabinet is greater than the preset first stability index threshold, the corresponding liquid-cooled energy storage single cabinet is abnormal, and the corresponding liquid-cooled energy storage single cabinet is disconnected from the main line; S104, If the stability index of the liquid-cooled energy storage single cabinet is less than or equal to the preset first stability index threshold, the corresponding liquid-cooled energy storage single cabinet is normal; S105, After traversing all the liquid-cooled energy storage single cabinets, obtain the stability index set of the liquid-cooled energy storage single cabinets; S106, Extract the volatility in the stability index set of the liquid-cooled energy storage single cabinets. If the volatility is less than the preset volatility threshold, the current liquid-cooled energy storage cabinet is normal information; S107, Send the current normal information of the liquid-cooled energy storage cabinet to a preset management terminal for display.

[0020] According to an embodiment of the present invention, the liquid-cooled energy storage cabinet is composed of a plurality of liquid-cooled energy storage single cabinets connected in parallel, and each liquid-cooled energy storage single cabinet is independently set. A switch is provided in the parallel circuit of the liquid-cooled energy storage single cabinets. When the stability index of the corresponding liquid-cooled energy storage single cabinet is greater than a preset first stability index threshold, the corresponding switch disconnects the liquid-cooled energy storage single cabinet in the parallel connection, so as to maintain the stable output of the entire liquid-cooled energy storage cabinet; by controlling the stable output of the liquid-cooled energy storage cabinet, the loss of energy during the conversion process is reduced.

[0021] According to an embodiment of the present invention, the step of obtaining the stability index of the corresponding liquid-cooled energy storage single cabinet according to the monitoring data information of the liquid-cooled energy storage single cabinet specifically includes: Extract the temperature value, voltage value and capacity value from the monitoring data information of the liquid-cooled energy storage single cabinet; Identify the temperature value, voltage value and capacity value according to the corresponding acquisition time respectively, and obtain the temperature value, voltage value and capacity value at each time node; Set the stability index of the liquid-cooled energy storage single cabinet as A, and its formula is: ; where 、 and are the corresponding weight coefficients respectively, 、 and represent the temperature value, voltage value and capacity value at time node t + 1 respectively, 、 and represent the temperature value, voltage value and capacity value at time node t respectively, represents the stability index of the liquid-cooled energy storage single cabinet i between time nodes t and t + 1.

[0022] It should be noted that during the operation of the liquid-cooled energy storage single cabinet, if the temperature difference, voltage difference or capacity difference between two different time points is larger, it indicates that there are unstable factors in the corresponding liquid-cooled energy storage single cabinet between the two different time nodes, and the stability index of the corresponding liquid-cooled energy storage single cabinet between the two different time nodes is larger. When the stability index is smaller, it indicates that the corresponding liquid-cooled energy storage single cabinet is more stable.

[0023] According to an embodiment of the present invention, it further includes: When the stability index of the liquid-cooled energy storage single cabinet is greater than a preset second stability index threshold, compare and analyze 、 and If is the largest, then judge Is it greater than zero? If it is greater than zero, a cooling prompt message for the corresponding liquid-cooled energy storage single cabinet is triggered; if it is less than zero, a heating prompt message for the corresponding liquid-cooled energy storage single cabinet is triggered; The preset second stability index threshold is less than the preset first stability index threshold.

[0024] It should be noted that when is the maximum, it indicates that the factor causing the stability index to be greater than the preset second stability index threshold is the temperature difference at present. When is greater than zero, it indicates that the current liquid-cooled energy storage single cabinet is heating up too fast, so the heat dissipation effect is triggered through the cooling prompt; when is less than zero, it indicates that the current liquid-cooled energy storage single cabinet is cooling down too fast, so the heating effect is triggered through the heating prompt message.

[0025] Furthermore, when the liquid-cooled energy storage single cabinet is cooling down through the coolant and makes the maximum and the stability index is greater than the preset second stability index threshold, according to the flow rate of the current coolant is revised, and the revised flow rate , where V represents the flow rate of the corresponding coolant when the liquid-cooled energy storage single cabinet is cooling down through the coolant, is the allowable temperature difference set for the liquid-cooled energy storage single cabinet.

[0026] According to the embodiment of the present invention, after triggering the cooling prompt message for the corresponding liquid-cooled energy storage single cabinet, it further includes: Controlling the coolant to dissipate heat from the liquid-cooled energy storage single cabinet through a preset coolant control valve, and the speed of the coolant is set to V, and the formula is , where is the heat loss power of the liquid-cooled energy storage single cabinet, is the contact resistance between the battery cells and the cold plate of the liquid-cooled energy storage single cabinet, is the thermal conductivity of the cold area liquid, is the density of the coolant, 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 single cabinet and the coolant at the current time node.

[0027] It should be noted that the greater the temperature difference between the liquid-cooled energy storage single cabinet and the coolant at the current time node, the smaller the corresponding coolant speed.

[0028] According to the embodiment of the present invention, it further includes: When the liquid-cooled energy storage single cabinet is in the charging state, if If it is less than or equal to zero, disconnect the corresponding liquid-cooled energy storage single cabinet from the main line; When the liquid-cooled energy storage single cabinet is in the discharging state, if is greater than or equal to zero, disconnect the corresponding liquid-cooled energy storage single cabinet from the main line.

[0029] It should be noted that when the liquid-cooled energy storage single cabinet is in the charging state, if is less than or equal to zero, it indicates that the current liquid-cooled energy storage single cabinet is discharging, so disconnect the corresponding liquid-cooled energy storage single cabinet; when the liquid-cooled energy storage single cabinet is in the discharging state, if is greater than or equal to zero, it indicates that the current liquid-cooled energy storage single cabinet is charging, so disconnect the corresponding liquid-cooled energy storage single cabinet.

[0030] According to the embodiment of the present invention, the step of extracting the volatility in the stable index set of the liquid-cooled energy storage single cabinet specifically includes: Calculate the mean value of the stable index set of the liquid-cooled energy storage single cabinet to obtain the average stable index; Set the volatility in the stable index set of the liquid-cooled energy storage single cabinet as , and its formula is: , where n represents the total number of stable indexes in the stable index set of the liquid-cooled energy storage single cabinet, represents the stable index of the i-th liquid-cooled energy storage single cabinet, represents the average stable index, and m is the stable index set of the liquid-cooled energy storage single cabinet.

[0031] It should be noted that by controlling the volatility 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 during energy conversion is reduced.

[0032] According to the embodiment of the present invention, it further includes: Obtain the output power of the liquid-cooled energy storage single cabinet; Identify the output power of the liquid-cooled energy storage single cabinet according to the corresponding collected time to obtain the output power at different time nodes; Based on the same time node, calculate the mean value of the output powers of different liquid-cooled energy storage single cabinets to obtain the average output power; Set the output power of the liquid-cooled energy storage single cabinet as P, and its formula is , where represents the output power of the i-th liquid-cooled energy storage single cabinet at the time node (t + 1), represents the output power of the i-th liquid-cooled energy storage single cabinet at the time node t, is the balance coefficient, represents the average output power of the currently paralleled liquid-cooled energy storage single cabinets. When t is zero, is the initial output power of the i-th liquid-cooled energy storage single cabinet.

[0033] It should be noted that after obtaining the average output power, the difference between the output power of the liquid-cooled energy storage single cabinet and the average output power is calculated to obtain the output power difference of the corresponding liquid-cooled energy storage single cabinet. If the output power difference of the corresponding liquid-cooled energy storage single cabinet is greater than the preset output power difference threshold, the output power of the corresponding liquid-cooled energy storage single cabinet needs to be adjusted. If the output power difference of the corresponding liquid-cooled energy storage single cabinet is less than or equal to the preset output power difference threshold, the output power of the corresponding liquid-cooled energy storage single cabinet does not need to be adjusted. The initial output power of the liquid-cooled energy storage single cabinet is determined according to 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 parallel liquid-cooled energy storage single cabinets to obtain the initial output power of the parallel liquid-cooled energy storage single cabinets; the output power of the liquid-cooled energy storage single cabinet is less than or equal to the maximum output power of the corresponding liquid-cooled energy storage single cabinet.

[0034] Furthermore, when there is an adjustment to the output power of a liquid-cooled energy storage single cabinet, the corresponding liquid-cooled energy storage single cabinet is set as the actively adjusted liquid-cooled energy storage single cabinet, and the power adjustment value is , represents the output power after adjustment of the actively adjusted liquid-cooled energy storage single cabinet, It represents the output power before the active adjustment of the liquid-cooled energy storage single cabinet. Then, the absolute value of the corresponding power adjustment value is compared 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, one passive adjustment liquid-cooled energy storage single 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 minus the absolute value of the power adjustment value is used to obtain the first difference, which is 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 passive adjustment liquid-cooled energy storage single cabinets are extracted. If the first difference is greater than the preset output power difference threshold, the comparison continues, and so on, until the Nth difference is less than or equal to the preset output power difference threshold, and N + 1 passive adjustment liquid-cooled energy storage single cabinets are extracted. When the output power of the active adjustment liquid-cooled energy storage single cabinet increases, the average output power is successively subtracted by the output powers of the remaining liquid-cooled energy storage single cabinets. The liquid-cooled energy storage single cabinets are arranged in ascending order of power difference, and N + 1 liquid-cooled energy storage single cabinets are extracted and set as passive adjustment liquid-cooled energy storage single cabinets. Except for the power adjustment value of the last passive adjustment liquid-cooled energy storage single cabinet in the sorting being the Nth difference, the power adjustment values of the other passive adjustment liquid-cooled energy storage single cabinets are the preset output power difference threshold. The output power after the adjustment of the active adjustment liquid-cooled energy storage single cabinet is the current output power minus the power adjustment value. When the output power of the active adjustment liquid-cooled energy storage single cabinet decreases, the average output power is successively subtracted by the output powers of the remaining liquid-cooled energy storage single cabinets. The liquid-cooled energy storage single cabinets are arranged in descending order of power difference, and N + 1 liquid-cooled energy storage single cabinets are extracted and set as passive adjustment liquid-cooled energy storage single cabinets. Except for the power adjustment value of the last passive adjustment liquid-cooled energy storage single cabinet in the sorting being the Nth difference, the power adjustment values of the other passive adjustment liquid-cooled energy storage single cabinets are the preset output power difference threshold. The output power after the adjustment of the active adjustment liquid-cooled energy storage single cabinet is the current output power plus the power adjustment value.

[0035] Further, when a liquid-cooled energy storage single cabinet is disconnected, the output power of the disconnected liquid-cooled energy storage single cabinet is evenly distributed to the parallel-connected liquid-cooled energy storage single cabinets, and the output power of each liquid-cooled energy storage single cabinet is re-obtained. If the output power of a liquid-cooled energy storage single cabinet is greater than the maximum output power of the corresponding liquid-cooled energy storage single cabinet, the output power of the corresponding liquid-cooled energy storage single cabinet is the maximum output power. When the output powers of all liquid-cooled energy storage single cabinets are the maximum output power and the total output power of the entire liquid-cooled energy storage single 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 for detection.

[0036] Further, when there is a spare liquid-cooled energy storage single cabinet, when one liquid-cooled energy storage single cabinet is disconnected, one corresponding spare liquid-cooled energy storage single cabinet is paralleled to the liquid-cooled energy storage cabinet, and the output power of the spare liquid-cooled energy storage single cabinet replaces the output power of the disconnected liquid-cooled energy storage single cabinet, so that the output powers of other liquid-cooled energy storage single cabinets do not need to share the output power of the disconnected liquid-cooled energy storage single cabinet; when the disconnected liquid-cooled energy storage single cabinet is set to normal, the corresponding disconnected liquid-cooled energy storage single cabinet is set as a spare liquid-cooled energy storage single cabinet.

[0037] Figure 2 The block diagram of an energy-saving liquid-cooled energy storage system according to the present invention is shown.

[0038] As Figure 2 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. An energy-saving liquid-cooled energy storage method program is stored in the memory. When the energy-saving liquid-cooled energy storage method program is executed by the processor, the following steps are implemented: Obtain the monitoring data information of the liquid-cooled energy storage single cabinet; According to the monitoring data information of the liquid-cooled energy storage single cabinet, obtain the stability index of the corresponding liquid-cooled energy storage single cabinet; If the stability index of the liquid-cooled energy storage single cabinet is greater than a preset first stability index threshold, the corresponding liquid-cooled energy storage single cabinet is abnormal, and the corresponding liquid-cooled energy storage single cabinet is disconnected from the main line; If the stability index of the liquid-cooled energy storage single cabinet is less than or equal to the preset first stability index threshold, the corresponding liquid-cooled energy storage single cabinet is normal; After traversing all the liquid-cooled energy storage single cabinets, obtain the stability index set of the liquid-cooled energy storage single cabinets; Extract the volatility in the stability index set of the liquid-cooled energy storage single cabinets. If the volatility is less than the preset volatility threshold, the current liquid-cooled energy storage cabinet is normal information; Send the information that the current liquid-cooled energy storage cabinet is normal to a preset management terminal for display.

[0039] In this solution, the step of obtaining the stability index of the corresponding liquid-cooled energy storage single cabinet according to the monitoring data information of the liquid-cooled energy storage single cabinet specifically includes: Extract the temperature value, voltage value and capacity value in the monitoring data information of the liquid-cooled energy storage single cabinet; Identify the temperature value, voltage value and capacity value according to the corresponding acquisition time respectively, and obtain the temperature value, voltage value and capacity value at each time node; Set the stability index of the liquid-cooled energy storage single cabinet as A, and its formula is: ; where 、 and are the corresponding weight coefficients respectively, , and respectively represent the temperature value, voltage value and capacity value at time node t+1. , and respectively represent the temperature value, voltage value and capacity value at time node t. represents the stability index of the liquid-cooled energy storage single cabinet i between time nodes t and t+1.

[0040] In this solution, it also includes: When the stability index of the liquid-cooled energy storage single cabinet is greater than the preset second stability index threshold, , and are compared and analyzed. If is the largest, then it is judged whether is greater than zero. If is greater than zero, then the cooling prompt information of the corresponding liquid-cooled energy storage single cabinet is triggered; if is less than zero, then the heating prompt information of the corresponding liquid-cooled energy storage single cabinet is triggered; The preset second stability index threshold is less than the preset first stability index threshold.

[0041] An energy-saving liquid-cooled energy storage method and system disclosed by the present invention, through real-time monitoring of the liquid-cooled energy storage single cabinet, determining the stability index of the liquid-cooled energy storage single cabinet connected to the main line, and removing the liquid-cooled energy storage single cabinet with a stability index greater than the preset first stability index threshold from the connection, further balancing the stability of the entire liquid-cooled energy storage cabinet through the volatility. Each liquid-cooled energy storage single cabinet is an independent monomer, with the ability of energy storage and AC / DC power conversion, and is equipped with a liquid-cooling system, which can operate safely, stably and reliably for a long time. While improving the energy storage effect of the liquid-cooled energy storage cabinet; by controlling the stable output of the liquid-cooled energy storage cabinet, the loss of energy in the conversion process is reduced.

[0042] In several embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. The device embodiments described above are only illustrative. For example, the division of the units is only 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 with each other can be through some interfaces, and the indirect coupling or communication connection of the devices or units can be electrical, mechanical or other forms.

[0043] The units described above as separate components may or may not be physically separated, and the components shown 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 can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0044] In addition, in each embodiment of the present invention, each functional unit may be fully integrated in a processing unit, or each unit may be separately regarded as a unit alone, or two or more units may be integrated in one unit; the above-mentioned integrated unit may be implemented in the form of hardware, or in the form of a combination of hardware and software functional units.

[0045] Those of ordinary skill in the art can understand that all or part of the steps of implementing the above method embodiments can be completed by hardware related to program instructions. The foregoing program can be stored in a computer-readable storage medium. When the program is executed, it performs the steps including the above method embodiments; and the foregoing storage medium includes: removable storage devices, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), magnetic disks or optical disks and other various media that can store program codes.

[0046] Alternatively, if the above-mentioned integrated unit of the present invention is implemented in the form of a software functional module and sold or used as an independent product, it can also be stored in a computer-readable storage medium. Based on such an understanding, the technical solution of the embodiments of the present invention, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the methods described in the embodiments of the present invention. And the foregoing storage medium includes: removable storage devices, ROM, RAM, magnetic disks or optical disks and other various media that can store program codes.

Claims

1. An energy-saving liquid cooling energy storage method, characterized in that, Including: Obtain the monitoring data information of a single liquid-cooled energy storage cabinet; Based on the monitoring data information of the single liquid-cooled energy storage cabinet, obtain the stability index of the corresponding single liquid-cooled energy storage cabinet; If the stability index of the single liquid-cooled energy storage cabinet is greater than a preset first stability index threshold, the corresponding single liquid-cooled energy storage cabinet is abnormal, and disconnect the corresponding single liquid-cooled energy storage cabinet from the main line; If the stability index of the single liquid-cooled energy storage cabinet is less than or equal to the preset first stability index threshold, the corresponding single liquid-cooled energy storage cabinet is normal; After traversing all single liquid-cooled energy storage cabinets, obtain the stability index set of the single liquid-cooled energy storage cabinets; Extract the volatility in the stability index set of the single liquid-cooled energy storage cabinet. If the volatility is less than the preset volatility threshold, the current single liquid-cooled energy storage cabinet is normal information; Send the information that the current single liquid-cooled energy storage cabinet is normal to a preset management terminal for display; The step of obtaining the stability index of the corresponding single liquid-cooled energy storage cabinet according to the monitoring data information of the single liquid-cooled energy storage cabinet specifically includes: Extract the temperature value, voltage value, and capacity value from the monitoring data information of the single liquid-cooled energy storage cabinet; Identify the temperature value, voltage value, and capacity value according to the corresponding acquisition time respectively, and obtain the temperature value, voltage value, and capacity value at each time node; Set the stability index of the single liquid-cooled energy storage cabinet as A, and its formula is: ; among them , and are the corresponding weight coefficients respectively, , and represent the temperature value, voltage value and capacity value at time node t + 1 respectively, , and represent the temperature value, voltage value and capacity value at time node t respectively, represents the stability index of the liquid-cooled energy storage single cabinet i between time nodes t and t + 1.

2. The method for energy-saving liquid-cooled energy storage according to claim 1, wherein Also including: When the stability index of the liquid-cooled energy storage single cabinet is greater than the preset second stability index threshold, , and are compared and analyzed. If is the largest, then it is judged whether is greater than zero. If is greater than zero, then the cooling prompt information for the corresponding liquid-cooled energy storage single cabinet is triggered; if is less than zero, then the heating prompt information for the corresponding liquid-cooled energy storage single cabinet is triggered; The preset second stability index threshold is less than the preset first stability index threshold.

3. An energy-saving liquid cooling energy storage method according to claim 2, characterized in that, After triggering the cooling prompt information of the corresponding single liquid-cooled energy storage cabinet, it also includes: Cool the liquid-cooled energy storage single cabinet with coolant controlled by a preset coolant control valve. The speed of the coolant is set to V, and the formula is , where is the heat loss power of the liquid-cooled energy storage single cabinet, is the contact resistance between the battery cells and the cold plate of the liquid-cooled energy storage single cabinet, is the thermal conductivity of the liquid in the cold area, is the density of the coolant, 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 single cabinet and the coolant at the current time node.

4. A method for energy-saving liquid-cooled energy storage according to claim 1, characterized in that, Also including: When the liquid-cooled energy storage single cabinet is in the charging state, if is less than or equal to zero, disconnect the corresponding liquid-cooled energy storage single cabinet from the main line; When the liquid-cooled energy storage single cabinet is in the discharging state, if is greater than or equal to zero, disconnect the corresponding liquid-cooled energy storage single cabinet from the main line.

5. A method for energy-saving liquid-cooled energy storage according to claim 1, characterized in that The step of extracting the volatility in the stability index set of the single liquid-cooled energy storage cabinet specifically includes: Perform a mean calculation on the stability index set of the single liquid-cooled energy storage cabinet to obtain the average stability index; Set the volatility of the stability index concentration of a single liquid-cooled energy storage cabinet to , and its formula is: , where n represents the total number of stability indices in the stability index concentration of a single liquid-cooled energy storage cabinet, represents the stability index of the i-th single liquid-cooled energy storage cabinet, represents the average value of the stability index, and m is the set of stability indices of the single liquid-cooled energy storage cabinet.

6. The energy-saving liquid cooling energy storage method according to claim 1, characterized in that Also including: Obtain the output power of the single liquid-cooled energy storage cabinet; Identify the output power of the single liquid-cooled energy storage cabinet according to the corresponding acquisition time, and obtain the output power at different time nodes; Based on the same time node, perform a mean calculation on the output powers of different single liquid-cooled energy storage cabinets to obtain the average output power; Set the output power of a single liquid-cooled energy storage cabinet as P, and its formula is , where represents the output power of the i-th single liquid-cooled energy storage cabinet at the time node (t + 1), represents the output power of the i-th single liquid-cooled energy storage cabinet at the time node t, is the balancing coefficient, represents the average output power of the currently paralleled single liquid-cooled energy storage cabinets. When t is zero, is the initial output power of the i-th single liquid-cooled energy storage cabinet.

7. An energy-saving liquid-cooled energy storage system, characterized in that, Including a memory and a processor, and a program for an energy-saving liquid-cooled energy storage method is stored in the memory. When the program for the energy-saving liquid-cooled energy storage method is executed by the processor, the following steps are implemented: Obtain the monitoring data information of the single liquid-cooled energy storage cabinet; Based on the monitoring data information of the single liquid-cooled energy storage cabinet, obtain the stability index of the corresponding single liquid-cooled energy storage cabinet; If the stability index of the single liquid-cooled energy storage cabinet is greater than the preset first stability index threshold, the corresponding single liquid-cooled energy storage cabinet is abnormal, and disconnect the corresponding single liquid-cooled energy storage cabinet from the main line; If the stability index of the single liquid-cooled energy storage cabinet is less than or equal to the preset first stability index threshold, the corresponding single liquid-cooled energy storage cabinet is normal; After traversing all single liquid-cooled energy storage cabinets, obtain the stability index set of the single liquid-cooled energy storage cabinets; Extract the volatility in the stability index set of the single liquid-cooled energy storage cabinet. If the volatility is less than the preset volatility threshold, the current single liquid-cooled energy storage cabinet is normal information; Send the information that the current single liquid-cooled energy storage cabinet is normal to a preset management terminal for display; The step of obtaining the stability index of the corresponding single liquid-cooled energy storage cabinet according to the monitoring data information of the single liquid-cooled energy storage cabinet specifically includes: Extract the temperature value, voltage value, and capacity value from the monitoring data information of the single liquid-cooled energy storage cabinet; Identify the temperature value, voltage value, and capacity value according to the corresponding acquisition time respectively, so as to obtain the temperature value, voltage value, and capacity value at each time node; Set the stability index of the single liquid-cooled energy storage cabinet as A, and its formula is: ; among them , and are the corresponding weight coefficients respectively, , and represent the temperature value, voltage value and capacity value at time node t + 1 respectively, , and represent the temperature value, voltage value and capacity value at time node t respectively, represents the stability index of the liquid-cooled energy storage single cabinet i between time nodes t and t + 1.

8. An energy-saving liquid-cooled energy storage system according to claim 7, characterized in that, It also includes: When the stability index of a single liquid-cooled energy storage cabinet is greater than a preset second stability index threshold, , and are compared and analyzed. If is the largest, then it is judged whether is greater than zero. If is greater than zero, a cooling prompt message for the corresponding single liquid-cooled energy storage cabinet is triggered; if is less than zero, a heating prompt message for the corresponding single liquid-cooled energy storage cabinet is triggered. The preset second stability index threshold is less than the preset first stability index threshold.

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