An equalization control method for an electrochemical energy storage management system

Abstract

The present invention relates to the technical field of electrochemical energy storage, and particularly to a method for balanced control of an electrochemical energy storage management system. In the present invention, each battery is connected in parallel to form a battery module, and each battery module is connected in series to form a battery cluster. Heat dissipation treatment is performed on the battery cluster storing electric energy, and the stored electric energy is current-limited to stabilize the output. Each battery module is periodically detected to respectively obtain the remaining capacity of each battery module within a single cycle. Based on the change amount of the remaining capacity, it is determined whether the balance management of the energy storage system meets the standard. When it does not meet the standard, the reason is determined, a corresponding processing method is generated based on the determined reason, a corresponding instruction is generated based on the determined processing method, and the instruction is sent to the corresponding component so that the component adjusts the operating parameters to the corresponding values. The present invention realizes real-time monitoring and precise adjustment of the balance management of the energy storage system, and effectively improves the operating efficiency of the energy storage system.

Description

Technical Field

[0001] The present invention relates to the technical field of electrochemical energy storage, and in particular to an equalization control method for an electrochemical energy storage management system. Background Art

[0002] The electrochemical energy storage management system is an important part of the electrochemical energy storage system, mainly responsible for monitoring and managing the operating status of energy storage batteries to ensure the safe and efficient operation of the system. The electrochemical energy storage management system mainly includes a battery management system and an energy management system. The main functions of the battery management system include: monitoring the voltage, current, temperature, etc. of the battery, preventing the battery from overcharging and over-discharging, and extending the service life of the battery; calculating and analyzing the remaining capacity and health status of the battery, and reporting abnormal information in a timely manner. The main responsibilities of the energy management system include: collecting the battery status and grid status of the energy storage system; real-time monitoring the operating status of the energy storage system to ensure system safety; scheduling the charge and discharge process of the energy storage system according to system requirements and grid status to achieve optimal energy distribution. Therefore, studying the method of equalizing and controlling the charge and discharge of the electrochemical energy storage system by the electrochemical energy storage management system will be beneficial to improving the operating efficiency of the electrochemical energy storage system.

[0003] Chinese Patent Publication No.: CN118040837A, discloses an electrochemical energy storage system, a system control method and related equipment, relating to the technical field of electrochemical energy storage. The system includes a battery cell unit, a battery management unit and an inverter; wherein, the battery cell unit includes a first battery cell unit and a second battery cell unit; the battery management unit is used to detect the battery cell status information of the battery cell unit; the first battery cell unit and the second battery cell unit are connected in parallel to form a parallel battery pack, and multiple parallel battery packs are connected in series to form a battery cluster, and the inverter is connected in series with the battery cluster. It can be seen that the above solution ensures the charge and discharge balance of the energy storage battery cells. However, the above solution cannot achieve real-time monitoring and precise adjustment of the balance management of the energy storage system, thus unable to guarantee the operating efficiency of the energy storage system. Summary of the Invention

[0004] Therefore, the present invention provides an equalization control method for an electrochemical energy storage management system to overcome the problem that the operating efficiency of the energy storage system is low due to the inability to achieve real-time monitoring and precise adjustment of the balance management of the energy storage system in the prior art.

[0005] To achieve the above object, the present invention provides an equalization control method for an electrochemical energy storage management system, including:

[0006] Connecting each battery in parallel to form a battery module, and connecting each battery module in series to form a battery cluster;

[0007] Performing heat dissipation treatment on the battery cluster storing electric energy;

[0008] Limit the current of the stored electric energy to achieve stable output;

[0009] Periodically detect each battery module to obtain the remaining capacity of each battery module within a single cycle, and determine the change in the remaining capacity of each battery module relative to the previous cycle based on the obtained remaining capacity;

[0010] Determine whether the balance management of the energy storage system meets the standard based on the change in the remaining capacity, and determine the reason for non-compliance based on the change in the remaining capacity when it is determined that the balance management of the energy storage system does not meet the standard;

[0011] After determining the reason, generate a corresponding processing method based on the determined reason;

[0012] Generate a corresponding instruction based on the determined processing method, and send the instruction to the corresponding component so that the component adjusts the operating parameters to the corresponding values;

[0013] When it is determined that the balance management of the energy storage system meets the standard, complete the periodic detection of the energy storage system, and determine whether the balance management of the energy storage system meets the standard for the next cycle.

[0014] Further, the process of determining whether the balance management of the energy storage system meets the standard based on the change in the remaining capacity includes:

[0015] Calculate the absolute value of the average of the change in the remaining capacity, and record the obtained absolute value of the average as the average change in the remaining capacity;

[0016] Determine whether the balance management of the energy storage system meets the standard based on the average change in the remaining capacity, and when it is determined that the balance management of the energy storage system does not meet the standard, determine whether the balance management of the energy storage system meets the standard based on the historical average, or determine the reason for non-compliance of the balance management of the energy storage system based on the average difference;

[0017] Wherein, the historical average is the average change in the remaining capacity of the historical cycle, and the average difference is the difference between the average change in the remaining capacity and the pre-stored preset average change in the remaining capacity.

[0018] Further, the process of determining whether the balance management of the energy storage system meets the standard based on the historical average includes:

[0019] Establish a historical cycle - historical average curve based on the historical average;

[0020] Obtain the slope of the curve at the current cycle node, and record the absolute value of the obtained slope as the absolute value of the average quantity slope;

[0021] When the absolute value of the average quantity slope is greater than the preset absolute value of the average quantity slope, it is determined that the balance management for the energy storage system does not meet the standard, and the reason why the balance management of the energy storage system does not meet the standard is determined based on the absolute value of the average quantity slope;

[0022] When the absolute value of the average quantity slope is less than or equal to the preset absolute value of the average quantity slope, it is determined that the balance management for the energy storage system meets the standard, and the periodic detection of the energy storage system is completed.

[0023] Further, the process of determining the reason why the balance management for the energy storage system does not meet the standard based on the absolute value of the average quantity slope includes:

[0024] Calculate the difference between the absolute value of the average quantity slope and the preset absolute value of the average quantity slope, and record the obtained difference as the average quantity slope difference;

[0025] When the average quantity slope difference is less than or equal to the preset average quantity slope difference, it is determined that the reason current for the balance management of the energy storage system does not meet the standard, and the resistance value of the protection resistor for current limiting is increased based on the increase of the average quantity slope difference;

[0026] When the average quantity slope difference is greater than the preset average quantity slope difference, the reason why the balance management for the energy storage system does not meet the standard is determined based on the average value difference.

[0027] Further, the process of increasing the resistance value of the protection resistor based on the average quantity slope difference includes:

[0028] Calculate the ratio of the average quantity slope difference to the preset average quantity slope difference, and record the obtained ratio as the slope difference ratio;

[0029] Increase the resistance value based on the slope difference ratio, and the increase amplitude of the resistance value is proportional to the slope difference ratio.

[0030] Further, the process of determining the reason why the balance management for the energy storage system does not meet the standard based on the average value difference includes:

[0031] Compare the average value difference with the pre-stored preset average value difference;

[0032] When the average value difference is less than or equal to the first preset average value difference, it is determined that the reason for the unqualified balance management of the energy storage system is that the temperature inside the battery cluster does not meet the standard, and based on the average value difference ratio, the rotation speed of the heat dissipation device for heat dissipation treatment of the battery cluster is increased, where the average value difference ratio is the ratio of the average value difference to the first preset average value difference;

[0033] When the average value difference is greater than the first preset average value difference and less than or equal to the second preset average value difference, the reason for the unqualified balance management of the energy storage system is determined based on the variance of the average value difference;

[0034] When the average value difference is greater than the second preset average value difference, it is determined that the reason for the unqualified balance management of the energy storage system is that the matching degree between the power consumption end demand and the stably output electric energy does not meet the standard, and a notice for dispatching electric energy is issued.

[0035] Further, the process of increasing the rotation speed of the heat dissipation device during heat dissipation based on the average value difference ratio includes:

[0036] The rotation speed of the heat dissipation device is increased based on the average value difference ratio, and the increase amplitude of the rotation speed of the heat dissipation device is proportional to the average value difference ratio.

[0037] Further, the process of reducing the power of the heat dissipation device based on the average value difference after the rotation speed of the heat dissipation device is increased includes:

[0038] When the average value difference is less than or equal to the first preset average value difference, the average value difference is recorded as the average change amount;

[0039] The power of the heat dissipation device is reduced based on the average change amount, and the reduction amplitude of the power of the heat dissipation device is inversely proportional to the average change amount.

[0040] Further, the process of determining the reason for the unqualified balance management of the energy storage system based on the variance of the average value difference includes:

[0041] Calculate the variance of the average value difference, and record the obtained variance as the average value difference variance;

[0042] When the variance of the average value difference is less than or equal to the variance of the preset average value difference, it is determined that the reason for the unqualified balance management of the energy storage system is that the temperature inside the battery cluster does not meet the standard, and the rotation speed of the heat dissipation device during heat dissipation is increased based on the average value difference ratio;

[0043] When the variance of the average value difference is greater than the variance of the preset average value difference, it is determined that the reason for the unqualified balance management of the energy storage system is the self-discharge phenomenon of the battery. The abnormal battery modules are determined based on the voltage values of the battery modules, and the preset voltage is increased based on the remaining capacity of the abnormal battery modules.

[0044] Further, the process of increasing the preset voltage based on the remaining capacity of the abnormal battery module includes:

[0045] Calculate the difference between the pre-stored preset remaining capacity and the remaining capacity, and record the obtained difference as the capacity difference;

[0046] Calculate the ratio of the capacity difference to the preset remaining capacity, and record the obtained ratio as the proportion of the capacity difference;

[0047] Increase the preset voltage based on the proportion of the capacity difference, and the increase amplitude of the preset voltage is proportional to the proportion of the capacity difference.

[0048] Compared with the prior art, the beneficial effects of the present invention are as follows. By periodically detecting the remaining capacity and determining whether the balance management of the energy storage system meets the standard based on the change amount of the remaining capacity, the present invention can quickly and accurately complete the determination of the balance management of the energy storage system, effectively realizing the real-time monitoring of the balance management of the energy storage system. When it is determined that the balance management of the energy storage system does not meet the standard, the unqualified reason is determined based on the change amount of the remaining capacity. After determining the reason, a corresponding processing method is generated based on the determined reason, and a corresponding instruction is generated based on the determined processing method. The instruction is sent to the corresponding component so that the component adjusts the operating parameters to the corresponding values, effectively realizing the precise adjustment of the balance management of the energy storage system. Adjusting the operating parameters to the corresponding values ensures that the balance management of the energy storage system meets the standard, effectively improving the operating efficiency of the energy storage system.

[0049] Further, when the average value of the remaining capacity change amount is greater than the first preset average value of the remaining capacity change amount and less than or equal to the second preset average value of the remaining capacity change amount, determining whether the balance management of the energy storage system meets the standard based on the absolute value of the average slope can more accurately determine whether the balance management of the energy storage system meets the standard, avoiding misjudgment. While further realizing the real-time monitoring of the balance management of the energy storage system, the operating efficiency of the energy storage system is further improved.

[0050] Further, when the absolute value of the average quantity slope is greater than the preset absolute value of the average quantity slope, the reason for the unqualified balance management of the energy storage system is determined based on the average quantity slope difference, and whether the current meets the standard is accurately determined, which is beneficial to the subsequent effective generation of corresponding processing methods. While further realizing the real-time monitoring of the balance management of the energy storage system, the operation efficiency of the energy storage system is further improved.

[0051] Further, when the current does not meet the standard, the resistance value of the protection resistor is increased based on the slope difference ratio, which can avoid the occurrence of the situation where the balance management of the energy storage system does not meet the standard due to the unqualified resistance value of the protection resistor. While further realizing the precise adjustment of the balance management of the energy storage system, the operation efficiency of the energy storage system is further improved.

[0052] Further, when it is determined that the balance management of the energy storage system does not meet the standard, the reason for the unqualified balance management of the energy storage system is determined based on the average value difference, which can quickly and accurately determine the specific reason for the unqualified balance management of the energy storage system. While further realizing the real-time monitoring of the balance management of the energy storage system, the operation efficiency of the energy storage system is further improved.

[0053] Further, when it is determined that the temperature inside the energy storage system does not meet the standard, the rotation speed of the heat dissipation device is increased based on the average value ratio, effectively avoiding the occurrence of the situation where the temperature inside the battery cluster is caused by the unqualified rotation speed of the heat dissipation device, resulting in the situation where the balance management of the energy storage system does not meet the standard. While further realizing the precise adjustment of the balance management of the energy storage system, the operation efficiency of the energy storage system is further improved.

[0054] Further, after the rotation speed of the heat dissipation device is increased, the power of the heat dissipation device is reduced based on the average change amount, and the power of the heat dissipation device is adjusted according to the change amount of the remaining capacity of the energy storage system, effectively solving the occurrence of the situation where the power of the heat dissipation device does not match the energy that the energy storage system can allocate to the heat dissipation device. While further realizing the precise adjustment of the balance management of the energy storage system, the operation efficiency of the energy storage system is further improved.

[0055] Further, the reason for the unqualified balance management of the energy storage system is determined based on the variance of the average value difference, accurately and quickly completing the determination of the reason for the unqualified balance management of the energy storage system, avoiding the occurrence of misjudgment between the unqualified temperature inside the energy storage system and the self-discharge phenomenon of the battery. While further realizing the real-time monitoring of the balance management of the energy storage system, the operation efficiency of the energy storage system is further improved.

[0056] Furthermore, when it is determined that the battery has a self-discharge phenomenon, a preset voltage is increased based on the proportion of the capacity difference, effectively solving the problem that the battery voltage does not meet the standard due to the self-discharge phenomenon of the battery. While further realizing the precise adjustment of the balance management for the energy storage system, the operation efficiency of the energy storage system is further improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] Figure 1 FIG. is a structural block diagram of a system using the electrochemical energy storage management system balancing control method;

[0058] Figure 2 FIG. is a flowchart of the balancing control method for the electrochemical energy storage management system of the present invention;

[0059] Figure 3 FIG. is a flowchart for determining whether the balance management for the energy storage system meets the standard according to the present invention;

[0060] Figure 4 FIG. is a flowchart for determining the reason why the balance management for the energy storage system does not meet the standard according to the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0061] In order to make the objectives and advantages of the present invention clearer, the present invention will be further described below in conjunction with embodiments; it should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0062] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the present invention and do not limit the protection scope of the present invention.

[0063] It should be noted that in the description of the present invention, the terms indicating directions or positional relationships such as "upper", "lower", "left", "right", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings. This is only for convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention.

[0064] In addition, it should be noted that in the description of the present invention, unless otherwise clearly defined and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0065] Please refer to Figure 1As shown, it is a structural block diagram of a system using the equalization control method of an electrochemical energy storage management system. The structure of the embodiment of the present invention includes an energy storage unit, a heat dissipation unit, a protection unit, an output unit, a detection unit, an analysis unit, and a control unit; wherein:

[0066] The energy storage unit connects each battery in parallel to form a battery module, and connects each battery module in series to form a battery cluster;

[0067] The heat dissipation unit is connected to the energy storage unit to dissipate heat from the battery cluster storing electrical energy;

[0068] The protection unit is connected to the energy storage unit and the output unit, and the protection unit is used to limit the current of the stored electrical energy to stably output through the output unit;

[0069] The detection unit is connected to the output unit to periodically detect each battery module respectively to obtain the remaining capacity of each battery module in a single cycle, and determine the change amount of the remaining capacity of each battery module in a single cycle relative to the previous cycle according to the obtained remaining capacity;

[0070] The analysis unit is connected to the detection unit to determine whether the balance management of the energy storage system meets the standard based on the change amount of the remaining capacity. When it is determined that the balance management of the energy storage system meets the standard, the periodic detection of the energy storage system is completed, and it is determined whether the balance management of the energy storage system in the next cycle meets the standard. The analysis unit is also used to determine the reason for non-compliance based on the change amount of the remaining capacity when it is determined that the balance management of the energy storage system does not meet the standard. After determining the reason, a corresponding processing method is generated based on the determined reason;

[0071] The control unit is respectively connected to the energy storage unit, the heat dissipation unit, the protection unit, and the analysis unit to generate corresponding instructions based on the determined processing method, and send the instructions to the corresponding components so that the components adjust the operating parameters to the corresponding values.

[0072] Please refer to Figure 2 As shown, it is a flowchart of the equalization control method of the electrochemical energy storage management system of the present invention. The method of the embodiment of the present invention includes:

[0073] Connect each battery in parallel to form the battery module, and connect each battery module in series to form the battery cluster;

[0074] Perform the heat dissipation treatment on the battery cluster storing the electrical energy;

[0075] Limit the current of the stored electrical energy to stably output;

[0076] Periodically detect each of the battery modules to obtain the remaining capacity of each battery module within a single period Z, and determine the change in the remaining capacity of each battery module relative to the previous period in a single period based on the obtained remaining capacity. Here, in this embodiment, the period Z = 0.15h;

[0077] Determine whether the balance management for the energy storage system meets the standard based on the change in the remaining capacity, and determine the reason for non-compliance based on the change in the remaining capacity when it is determined that the balance management for the energy storage system does not meet the standard;

[0078] After determining the reason, generate a corresponding processing method based on the determined reason;

[0079] Generate a corresponding instruction based on the determined processing method, and send the instruction to the corresponding component so that the component adjusts the operating parameters to the corresponding values;

[0080] When it is determined that the balance management for the energy storage system meets the standard, complete the periodic detection of the energy storage system, and determine whether the balance management for the energy storage system in the next period meets the standard.

[0081] Please refer to Figure 3 as shown, which is a flowchart of the present invention for determining whether the balance management for the energy storage system meets the standard. The process of the embodiment of the present invention for determining whether the balance management for the energy storage system meets the standard based on the change in the remaining capacity includes:

[0082] Calculate the absolute value of the average value of the change in the remaining capacity, and record the obtained absolute value of the average value as the average value of the change in the remaining capacity;

[0083] When the average value of the change in the remaining capacity is less than or equal to the first preset average value of the change in the remaining capacity A1, it is determined that the balance management for the energy storage system meets the standard, and the periodic detection of the energy storage system is completed. Here, in this embodiment, the first preset average value of the change in the remaining capacity A1 = 5%;

[0084] When the average value of the change in the remaining capacity is greater than the first preset average value of the change in the remaining capacity A1 and less than or equal to the second preset average value of the change in the remaining capacity A2, determine whether the balance management for the energy storage system meets the standard based on the historical average. Here, in this embodiment, the second preset average value of the change in the remaining capacity A2 = 62%, and the historical average is the average value of the change in the remaining capacity in the historical period;

[0085] When the average value of the remaining capacity change amount is greater than the second preset average value of the remaining capacity change amount A2, it is determined that the balance management of the energy storage system does not meet the standard, and the reason for the non - compliance of the balance management of the energy storage system is determined based on the average value difference, where the average value difference is the difference between the average value of the remaining capacity change amount and the second preset average value of the remaining capacity change amount.

[0086] Please continue to refer to Figure 3 As shown, the process of determining whether the balance management of the energy storage system meets the standard based on the historical average value in the embodiment of the present invention includes:

[0087] Establish a historical cycle - historical average value curve based on the historical average value;

[0088] Obtain the slope of the curve at the current cycle node, and record the absolute value of the obtained slope as the absolute value of the average amount slope;

[0089] When the absolute value of the average amount slope is greater than the preset absolute value of the average amount slope S, it is determined that the balance management of the energy storage system does not meet the standard, and the reason for the non - compliance of the balance management of the energy storage system is determined based on the absolute value of the average amount slope. Here, in this embodiment, the preset absolute value of the average amount slope S = 1.25;

[0090] When the absolute value of the average amount slope is less than or equal to the preset absolute value of the average amount slope S, it is determined that the balance management of the energy storage system meets the standard, and the periodic detection of the energy storage system is completed.

[0091] Please continue to refer to Figure 3 As shown, the process of determining the reason for the non - compliance of the balance management of the energy storage system based on the absolute value of the average amount slope in the embodiment of the present invention includes:

[0092] Calculate the difference between the absolute value of the average amount slope and the preset absolute value of the average amount slope, and record the obtained difference as the average amount slope difference;

[0093] When the average amount slope difference is less than or equal to the preset average amount slope difference △E, it is determined that the current of the reason for the non - compliance of the balance management of the energy storage system does not meet the standard, and the resistance value of the protection resistor in the protection unit for current limiting is increased based on the increase of the average amount slope difference. Here, in this embodiment, the preset average amount slope difference △E = 0.35;

[0094] When the average amount slope difference is greater than the preset average amount slope difference △E, the reason for the non - compliance of the balance management of the energy storage system is determined based on the average value difference.

[0095] Please continue to refer to Figure 3As shown in the figure, the process of increasing the resistance value of the protection resistor based on the average quantity slope difference in the embodiments of the present invention includes:

[0096] Calculate the ratio of the average quantity slope difference to the preset average quantity slope difference, and denote the obtained ratio as the slope difference ratio;

[0097] Increase the resistance value based on the slope difference ratio;

[0098] When the slope difference ratio is greater than the second preset slope difference ratio P2, increase the resistance value to 1.38 times the initial resistance value. In this embodiment, the second preset slope difference ratio P2 = 62.9%;

[0099] When the slope difference ratio is less than or equal to the second preset slope difference ratio P2 and greater than the first preset slope difference ratio P1, increase the resistance value to 1.21 times the initial resistance value. In this embodiment, the first preset slope difference ratio P1 = 37.1%;

[0100] When the slope difference ratio is less than or equal to the first preset slope difference ratio P1, increase the resistance value to 1.16 times the initial resistance value.

[0101] Please refer to Figure 4 As shown in the figure, it is a flowchart for the present invention to determine the reasons why the balance management for the energy storage system does not meet the standards. The process of the embodiments of the present invention to determine the reasons why the balance management for the energy storage system does not meet the standards based on the average value difference includes:

[0102] Compare the average value difference with the pre-stored preset average value difference;

[0103] When the average value difference is less than or equal to the first preset average value difference △D1, determine that the reason why the balance management for the energy storage system does not meet the standards is that the temperature inside the battery cluster does not meet the standards, and increase the rotation speed of the heat dissipation device in the heat dissipation unit for heat dissipation treatment of the battery cluster based on the average value difference ratio. In this embodiment, the first preset average value difference △D1 = 9%, and the average value difference ratio is the ratio of the average value difference to the first preset average value difference;

[0104] When the average value difference is greater than the first preset average value difference △D1 and less than or equal to the second preset average value difference △D2, determine the reason why the balance management for the energy storage system does not meet the standards based on the variance of the average value difference. In this embodiment, the second preset average value difference △D2 = 21%;

[0105] When the difference between the average values is greater than the second preset average value difference △D2, it is determined that the reason for the unqualified balance management of the energy storage system is that the matching degree between the demand at the power consumption end and the stable output electric energy does not meet the standard, and a notice for dispatching electric energy is issued.

[0106] Please continue to refer to Figure 4 As shown, the process of increasing the rotation speed of the heat dissipation device based on the average value difference ratio in the embodiment of the present invention includes:

[0107] Increase the rotation speed of the heat dissipation device based on the average value difference ratio;

[0108] When the average value difference ratio is greater than the second preset average value difference ratio △B2, increase the rotation speed of the heat dissipation device to 1.56 times the rotation speed of the initial heat dissipation device, where the second preset average value difference ratio △B2 = 68.9% in this embodiment;

[0109] When the average value difference ratio is less than or equal to the second preset average value difference ratio △B2 and greater than the first preset average value difference ratio △B1, increase the rotation speed of the heat dissipation device to 1.35 times the rotation speed of the initial heat dissipation device, where the first preset average value difference ratio △B1 = 27.8% in this embodiment;

[0110] When the average value difference ratio is less than or equal to the first preset average value difference ratio △B1, increase the rotation speed of the heat dissipation device to 1.26 times the rotation speed of the initial heat dissipation device.

[0111] Please continue to refer to Figure 4 As shown, the process of reducing the power of the heat dissipation device based on the average value difference after the rotation speed of the heat dissipation device in the embodiment of the present invention increases includes:

[0112] When the average value difference is less than or equal to the first preset average value difference, record the average value difference as the average change amount;

[0113] Reduce the power of the heat dissipation device based on the average change amount;

[0114] When the average change amount is greater than the second preset average change amount △M2, reduce the power of the heat dissipation device to 0.96 times the power of the initial heat dissipation device, where the second preset average change amount △M2 = 62% in this embodiment;

[0115] When the average change amount is less than or equal to the second preset average change amount △M2 and greater than the first preset average change amount △M1, reduce the power of the heat dissipation device to 0.91 times the power of the initial heat dissipation device, where the first preset average change amount △M1 = 35% in this embodiment;

[0116] When the average change amount is less than or equal to the first preset average change amount △M1, reduce the power of the heat dissipation device to 0.88 times the power of the initial heat dissipation device;

[0117] Specifically, the premise for reducing the power of the heat dissipation device based on the average change amount in this embodiment is that the heat dissipation device uses the energy stored in the battery cluster.

[0118] Please continue to refer to Figure 4 As shown, the process of determining the reason why the balance management for the energy storage system does not meet the standard based on the variance of the average value difference in the embodiment of the present invention includes:

[0119] Calculate the variance of the average value difference, and record the obtained variance as the average value difference variance;

[0120] When the variance of the average value difference is less than or equal to the preset variance of the average value difference C, it is determined that the reason why the balance management for the energy storage system does not meet the standard is that the temperature inside the battery cluster does not meet the standard, and based on the average value difference ratio, increase the rotation speed of the heat dissipation device when increasing heat dissipation. Here, the preset variance of the average value difference C = 0.13 in this embodiment;

[0121] When the variance of the average value difference is greater than the preset variance of the average value difference C, it is determined that the reason why the balance management for the energy storage system does not meet the standard is that the battery has a self-discharge phenomenon. Determine the abnormal battery module based on the voltage values of each battery module, and increase the preset voltage based on the remaining capacity of the abnormal battery module.

[0122] Please continue to refer to Figure 4 As shown, the process of increasing the preset voltage based on the remaining capacity of the abnormal battery module in the embodiment of the present invention includes:

[0123] Calculate the difference between the pre-stored preset remaining capacity and the remaining capacity, and record the obtained difference as the capacity difference;

[0124] Calculate the ratio of the capacity difference to the preset remaining capacity, and record the obtained ratio as the capacity difference ratio;

[0125] Increase the preset voltage based on the capacity difference ratio;

[0126] When the capacity difference ratio is greater than the second preset capacity difference ratio △F2, increase the preset voltage to 1.26 times the initial preset voltage. Here, the second preset capacity difference △F2 = 72% in this embodiment;

[0127] When the proportion of the capacity difference is less than or equal to the second preset proportion of the capacity difference △F2 and greater than the first preset proportion of the capacity difference △F1, increase the preset voltage to 1.11 times the initial preset voltage, where the first preset capacity difference △F1 = 39% in this embodiment;

[0128] When the proportion of the capacity difference is less than or equal to the first preset proportion of the capacity difference △F1, increase the preset voltage to 1.05 times the initial preset voltage.

[0129] So far, the technical solution of the present invention has been described in conjunction with the preferred embodiments shown in the drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

[0130] The above are only the preferred embodiments of the present invention and are not used to limit the present invention; for those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An equalization control method for an electrochemical energy storage management system, characterized in that, Including: Connecting each battery in parallel to form a battery module, and connecting each battery module in series to form a battery cluster; Performing heat dissipation treatment on the battery cluster storing electrical energy; Limiting the current of the stored electrical energy to achieve stable output; Periodically detecting each battery module respectively to obtain the remaining capacity of each battery module within a single cycle, and determining the change amount of the remaining capacity of each battery module relative to the previous cycle based on the obtained remaining capacity; Judging whether the balance management for the energy storage system meets the standard based on the change amount of the remaining capacity, and determining the reason for non-compliance based on the change amount of the remaining capacity when it is determined that the balance management for the energy storage system does not meet the standard; After determining the reason, generating a corresponding processing method based on the determined reason; Generating a corresponding instruction based on the determined processing method, and sending the instruction to the corresponding component so that the component adjusts the operating parameter to the corresponding value; When it is determined that the balance management for the energy storage system meets the standard, completing the periodic detection of the energy storage system, and judging whether the balance management for the energy storage system in the next cycle meets the standard; Among them, the process of judging whether the balance management for the energy storage system meets the standard based on the change amount of the remaining capacity includes: Calculating the absolute value of the average value of the change amount of the remaining capacity, and recording the obtained absolute value of the average value as the average value of the change amount of the remaining capacity; Judging whether the balance management for the energy storage system meets the standard based on the average value of the change amount of the remaining capacity, and when it is determined that the balance management for the energy storage system does not meet the standard, judging whether the balance management for the energy storage system meets the standard based on the historical average amount, or determining the reason for non-compliance of the balance management for the energy storage system based on the average value difference; among them, the historical average amount is the average value of the change amount of the remaining capacity in the historical cycle, and the average value difference is the difference between the average value of the change amount of the remaining capacity and the pre-stored preset average value of the change amount of the remaining capacity; Among them, the process of judging whether the balance management for the energy storage system meets the standard based on the historical average amount includes: Establishing a historical cycle - historical average amount curve based on the historical average amount; Obtaining the slope of the curve at the current cycle node, and recording the obtained absolute value of the slope as the absolute value of the average amount slope; When the absolute value of the average amount slope is greater than the preset absolute value of the average amount slope, judging that the balance management for the energy storage system does not meet the standard, and determining the reason for non-compliance of the balance management of the energy storage system based on the absolute value of the average amount slope; When the absolute value of the average amount slope is less than or equal to the preset absolute value of the average amount slope, judging that the balance management for the energy storage system meets the standard, and completing the periodic detection of the energy storage system.

2. The equalization control method of the electrochemical energy storage management system according to claim 1, wherein The process of determining the reason for non-compliance of the balance management for the energy storage system based on the absolute value of the average amount slope includes: Calculating the difference between the absolute value of the average amount slope and the preset absolute value of the average amount slope, and recording the obtained difference as the average amount slope difference; When the average quantity slope difference is less than or equal to the preset average quantity slope difference, it is determined that the cause current for the balance management of the energy storage system does not meet the standard, and the resistance value of the protection resistor for current limitation is increased based on the increase in the average quantity slope difference; When the average quantity slope difference is greater than the preset average quantity slope difference, the reason for the unqualified balance management of the energy storage system is determined based on the average value difference.

3. The equalization control method of the electrochemical energy storage management system according to claim 2, characterized in that The process of increasing the resistance value of the protection resistor based on the average quantity slope difference includes: Calculating the ratio of the average quantity slope difference to the preset average quantity slope difference, and recording the obtained ratio as the slope difference ratio; Increasing the resistance value based on the slope difference ratio, and the increase amplitude of the resistance value is proportional to the slope difference ratio.

4. The equalization control method of the electrochemical energy storage management system according to claim 2, characterized in that The process of determining the reason for the unqualified balance management of the energy storage system based on the average value difference includes: Comparing the average value difference with the pre-stored preset average value difference; When the average value difference is less than or equal to the first preset average value difference, it is determined that the reason for the unqualified balance management of the energy storage system is that the temperature inside the battery cluster does not meet the standard, and the rotation speed of the heat dissipation device for heat dissipation treatment of the battery cluster is increased based on the average value difference ratio, where the average value difference ratio is the ratio of the average value difference to the first preset average value difference; When the average value difference is greater than the first preset average value difference and less than or equal to the second preset average value difference, the reason for the unqualified balance management of the energy storage system is determined based on the variance of the average value difference; When the average value difference is greater than the second preset average value difference, it is determined that the reason for the unqualified balance management of the energy storage system is that the matching degree between the power consumption end demand and the stable output electric energy does not meet the standard, and a notice for power scheduling is issued.

5. The equalization control method of the electrochemical energy storage management system according to claim 4, characterized in that The process of increasing the rotation speed of the heat dissipation device during heat dissipation based on the average value difference ratio includes: Increasing the rotation speed of the heat dissipation device based on the average value difference ratio, and the increase amplitude of the rotation speed of the heat dissipation device is proportional to the average value difference ratio.

6. The equalization control method of the electrochemical energy storage management system according to claim 5, characterized in that The process of reducing the power of the heat dissipation device based on the average value difference after the rotation speed of the heat dissipation device is increased includes: When the average value difference is less than or equal to the first preset average value difference, the average value difference is recorded as the average change amount; Reducing the power of the heat dissipation device based on the average change amount, and the reduction amplitude of the power of the heat dissipation device is inversely proportional to the average change amount.

7. The equalization control method for the electrochemical energy storage management system according to claim 4, characterized in that The process of determining the reason for the unqualified balance management of the energy storage system based on the variance of the average value difference includes: Calculating the variance of the average value difference, and recording the obtained variance as the average value difference variance; When the variance of the average value difference is less than or equal to the variance of the preset average value difference, it is determined that the reason for the unqualified balance management of the energy storage system is that the temperature inside the battery cluster does not meet the standard, and the rotation speed of the heat dissipation device during heat dissipation is increased based on the average value difference ratio; When the variance of the mean difference is greater than the variance of the preset mean difference, it is determined that the reason for the unqualified balance management of the energy storage system is the self-discharge phenomenon of the battery. The abnormal battery module is determined based on the voltage values of the battery modules, and the preset voltage is increased based on the remaining capacity of the abnormal battery module.

8. The equalization control method for an electrochemical energy storage management system according to claim 7, wherein The process of increasing the preset voltage based on the remaining capacity of the abnormal battery module includes: Calculating the difference between the pre-stored preset remaining capacity and the remaining capacity, and recording the obtained difference as the capacity difference; Calculating the ratio of the capacity difference to the preset remaining capacity, and recording the obtained ratio as the proportion of the capacity difference; Increasing the preset voltage based on the proportion of the capacity difference, and the increase amplitude of the preset voltage is proportional to the proportion of the capacity difference.

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