Balanced control method for electrochemical energy storage management system

Abstract

The invention relates to the technical field of electrochemical energy storage, in particular to a balance control method for an electrochemical energy storage management system, which comprises the following steps of: connecting batteries in parallel to form battery modules, connecting the battery modules in series to form a battery cluster, performing heat dissipation treatment on the battery cluster for storing electric energy, and performing current limitation on the stored electric energy to stably output. Periodically detecting each battery module to obtain the residual capacity of each battery module in a single period, judging whether the balance management of the energy storage system meets the standard or not based on the variation of the residual capacity, determining a reason when the balance management does not meet the standard, generating a corresponding processing mode based on the determined reason, and sending the corresponding processing mode to the battery module. And generating a corresponding instruction based on the determined processing mode, and transmitting the instruction to the corresponding component to enable the component to adjust the operation parameter to a corresponding value. According to the invention, real-time monitoring and accurate adjustment for balance management of the energy storage system are realized, and the operation efficiency of the energy storage system is effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of electrochemical energy storage, and in particular to a balanced 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. It is mainly responsible for monitoring and managing the operating status of the energy storage battery to ensure the safe and efficient operation of the system. The electrochemical energy storage management system mainly includes the battery management system and the energy management system. The main functions of the battery management system include: monitoring the voltage, current, temperature, etc. of the battery to prevent the battery from overcharging and over-discharging, and extending the battery life; 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 of the operating status of the energy storage system to ensure system safety; scheduling the charging and discharging process of the energy storage system according to system requirements and grid status to achieve optimal energy distribution. Therefore, studying the method of balanced control of the charging and discharging of the electrochemical energy storage system by the electrochemical energy storage management system will help improve the operating efficiency of the electrochemical energy storage system.

[0003] Chinese Patent Publication No.: CN118040837A, discloses an electrochemical energy storage system, system control method and related equipment, and relates to the field of electrochemical energy storage technology. 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 group, and multiple parallel battery groups 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 scheme ensures the balance of charge and discharge of the energy storage cell. However, the above scheme cannot achieve real-time monitoring and precise adjustment of the balance management of the energy storage system, and thus cannot guarantee the operating efficiency of the energy storage system. Summary of the invention

[0004] To this end, the present invention provides an electrochemical energy storage management system balance control method to overcome the problem in the prior art that the real-time monitoring and precise adjustment of the balance management of the energy storage system cannot be achieved, resulting in low operating efficiency of the energy storage system.

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

[0006] The batteries are connected in parallel to form a battery module, and the battery modules are connected in series to form a battery cluster;

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

[0008] Limiting the current of the stored electric energy to stabilize the output;

[0009] Performing periodic detection on each of the battery modules to obtain the remaining capacity of each battery module in a single cycle, and determining the change of the remaining capacity of each battery module in a single cycle relative to the previous cycle according to the obtained remaining capacity;

[0010] Determining whether the balancing management of the energy storage system meets the standards based on the change in the remaining capacity, and determining the reason for not meeting the standards based on the change in the remaining capacity when it is determined that the balancing management of the energy storage system does not meet the standards;

[0011] After the cause is determined, a corresponding treatment method is generated based on the determined cause;

[0012] Generate corresponding instructions based on the determined processing method, and transmit the instructions to the corresponding components so that the components adjust the operating parameters to the corresponding values;

[0013] 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 whether the balance management of the energy storage system meets the standard in the next period is determined.

[0014] Furthermore, 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] Calculating an absolute value of an average value of the variation of the remaining capacity, and recording the obtained absolute value of the average value as an average value of the variation of the remaining capacity;

[0016] Determining whether the balancing management of the energy storage system meets the standard based on the average value of the remaining capacity change, and, when it is determined that the balancing management of the energy storage system does not meet the standard, determining whether the balancing management of the energy storage system meets the standard based on the historical average value, or determining the reason why the balancing management of the energy storage system does not meet the standard based on the average value difference;

[0017] The historical average is an average value of the remaining capacity changes in the historical period, and the average value difference is a difference between the remaining capacity change average and a pre-stored preset remaining capacity change average.

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

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

[0020] Obtaining the slope of the curve at the current period node, and recording the absolute value of the obtained slope as the absolute value of the average slope;

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

[0022] When the absolute value of the average slope is less than or equal to the preset absolute value of the average slope, 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.

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

[0024] Calculating the difference between the average quantity slope absolute value and the preset average quantity slope absolute value, and recording the obtained difference as the average quantity slope difference;

[0025] When the average quantity slope difference is less than or equal to a preset average quantity slope difference, determining that the current does not meet the standard for the reason why the balance management of the energy storage system does not meet the standard, and increasing the resistance value of the protection resistor for current limitation based on 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 of 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 slope difference includes:

[0028] Calculating the ratio of the average slope difference to the preset average slope difference, and recording the obtained ratio as the slope difference ratio;

[0029] The resistance value is increased 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 of the energy storage system does not meet the standard based on the average value difference includes:

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

[0032] When the average value difference is less than or equal to a first preset average value difference, it is determined that the reason why the balance management of the energy storage system does not meet the standard 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 of the battery cluster is increased based on the average value difference ratio, wherein the average value difference ratio is a 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, determining the reason why the balance management of the energy storage system does not meet the standard 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 why the balance management of the energy storage system does not meet the standard is that the matching degree between the power demand and the stable output of the electric energy does not meet the standard, and a notification of electric energy dispatching 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 sink is increased based on the average value difference ratio, and the increase amplitude of the rotation speed of the heat sink is proportional to the average value difference ratio.

[0037] Further, the process of reducing the power of the heat sink based on the average value difference after the rotation speed of the heat sink increases 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;

[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 why the balance management of the energy storage system does not meet the standard based on the variance of the mean value difference includes:

[0041] Calculating the variance of the mean value difference, and recording the obtained variance as the mean 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, determining that the reason why the balance management of the energy storage system does not meet the standard is that the temperature inside the battery cluster does not meet the standard, and increasing the rotation speed of the heat dissipation device during heat dissipation based on the average value difference ratio;

[0043] When the variance of the mean value difference is greater than the variance of the preset mean value difference, it is determined that the reason why the balance management of the energy storage system does not meet the standards is that the battery has self-discharge, the abnormal battery module is determined based on the voltage value of each battery module, and the preset voltage is increased based on the remaining capacity of the abnormal battery module.

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

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

[0046] Calculating a ratio of the capacity difference to the preset remaining capacity, and recording the obtained ratio as the capacity difference ratio;

[0047] The preset voltage is increased based on the capacity difference ratio, and the increase range of the preset voltage is proportional to the capacity difference ratio.

[0048] Compared with the prior art, the beneficial effect of the present invention lies in that the present invention can quickly and accurately complete the determination of the balance management of the energy storage system by periodically detecting the remaining capacity and determining whether the balance management of the energy storage system meets the standards based on the change in the remaining capacity, effectively realizing real-time monitoring of the balance management of the energy storage system, determining the cause of the failure 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 standards, generating a corresponding processing method based on the determined cause after the cause is determined, generating a corresponding instruction based on the determined processing method, transmitting the instruction to the corresponding component so that the component adjusts the operating parameters to the corresponding values, effectively realizing 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 standards, and effectively improving the operating efficiency of the energy storage system.

[0049] Furthermore, when the average value of the remaining capacity change is greater than the first preset average value of the remaining capacity change and less than or equal to the second preset average value of the remaining capacity change, whether the balance management of the energy storage system meets the standards is determined based on the absolute value of the average slope. This can more accurately determine whether the balance management of the energy storage system meets the standards and avoid misjudgment. While further realizing real-time monitoring of the balance management of the energy storage system, it further improves the operating efficiency of the energy storage system.

[0050] Furthermore, when the absolute value of the average quantity slope is greater than the preset absolute value of the average quantity slope, the reason why the balance management of the energy storage system does not meet the standards is determined based on the average quantity slope difference, and whether the current meets the standards is accurately determined, which is beneficial to the subsequent effective generation of corresponding processing methods. While further realizing real-time monitoring of the balance management of the energy storage system, it further improves the operating efficiency of the energy storage system.

[0051] Furthermore, increasing the resistance value of the protective resistor based on the slope difference ratio when the current does not meet the standard can avoid the situation where the balance management of the energy storage system does not meet the standard due to the resistance value of the protective resistor not meeting the standard. While further realizing precise adjustment of the balance management of the energy storage system, it further improves the operating efficiency of the energy storage system.

[0052] Furthermore, when it is determined that the balance management of the energy storage system does not meet the standards, the reason why the balance management of the energy storage system does not meet the standards is determined based on the mean value difference, which can quickly and accurately determine the reason why the balance management of the energy storage system does not meet the standards. While further realizing real-time monitoring of the balance management of the energy storage system, it further improves the operating efficiency of the energy storage system.

[0053] Furthermore, when it is determined that the temperature inside the energy storage system does not meet the standards, the rotation speed of the heat sink is increased based on the average value difference ratio, which effectively avoids the situation where the temperature inside the battery cluster does not meet the standards due to the rotation speed of the heat sink not meeting the standards, thereby causing the balance management of the energy storage system to not meet the standards. While further realizing precise adjustment of the balance management of the energy storage system, the operating efficiency of the energy storage system is further improved.

[0054] Furthermore, after the rotation speed of the heat sink increases, the power of the heat sink is reduced based on the average change, and the power of the heat sink is adjusted according to the change in the remaining capacity of the energy storage system, which effectively solves the problem of mismatch between the power of the heat sink and the energy that the energy storage system can allocate to the heat sink. While further realizing precise adjustment of the balance management of the energy storage system, it further improves the operating efficiency of the energy storage system.

[0055] Furthermore, the reason why the balance management of the energy storage system does not meet the standards is determined based on the variance of the mean value difference, and the reason why the balance management of the energy storage system does not meet the standards is determined accurately and quickly, avoiding the occurrence of misjudgment between the temperature inside the energy storage system not meeting the standards and the self-discharge of the battery. While further realizing real-time monitoring of the balance management of the energy storage system, the operating efficiency of the energy storage system is further improved.

[0056] Furthermore, when it is determined that the battery has self-discharge, the preset voltage is increased based on the capacity difference ratio, which effectively solves the situation where the battery voltage does not meet the standard due to the battery self-discharge phenomenon. While further realizing the precise adjustment of the balance management of the energy storage system, it further improves the operating efficiency of the energy storage system. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] Figure 1 A structural block diagram of a system using an electrochemical energy storage management system balance control method;

[0058] Figure 2 It is a flow chart of the balanced control method of the electrochemical energy storage management system of the present invention;

[0059] Figure 3 A flow chart for determining whether the balancing management of the energy storage system meets the standards according to the present invention;

[0060] Figure 4 A flow chart of the present invention for determining the reason why the balancing management of the energy storage system does not meet the standards. DETAILED DESCRIPTION

[0061] In order to make the objects and advantages of the present invention more clearly understood, the present invention is 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 are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0063] It should be noted that, in the description of the present invention, terms such as "up", "down", "left", "right", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is merely for the 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. Therefore, it cannot be understood as a limitation on the present invention.

[0064] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0065] See also Figure 1As shown, it is a structural block diagram of a system using an electrochemical energy storage management system balanced control method. 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 the batteries in parallel to form a battery module, and connects the battery modules in series to form a battery cluster;

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

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

[0069] The detection unit is connected to the output unit, and is used to periodically detect each of the battery modules to obtain the remaining capacity of each battery module in a single cycle, and determine the change 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, and is used to determine whether the balance management of the energy storage system meets the standard based on the change in the remaining capacity, complete the periodic detection of the energy storage system when it is determined that the balance management of the energy storage system meets the standard, and determine whether the balance management of the energy storage system meets the standard in the next period. The analysis unit is also used to determine the reason for non-compliance with the standard 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, and after completing the determination of the reason, generate a corresponding processing method 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, and is used to generate corresponding instructions based on the determined processing method, and transmit the instructions to the corresponding components so that the components adjust the operating parameters to the corresponding values.

[0072] See also Figure 2 As shown, it is a flow chart of the balanced control method of the electrochemical energy storage management system of the present invention. The method of the embodiment of the present invention includes:

[0073] Connecting the batteries in parallel to form the battery module, and connecting the battery modules in series to form the battery cluster;

[0074] performing the heat dissipation process on the battery cluster storing the electric energy;

[0075] Limiting the current of the stored electric energy to stabilize the output;

[0076] Perform periodic detection on each of the battery modules to obtain the remaining capacity of each battery module in a single cycle Z, and determine the change of the remaining capacity of each battery module in a single cycle relative to the previous cycle according to the obtained remaining capacity, wherein the cycle Z in this embodiment is 0.15h;

[0077] Determining whether the balancing management of the energy storage system meets the standards based on the change in the remaining capacity, and determining the reason for not meeting the standards based on the change in the remaining capacity when it is determined that the balancing management of the energy storage system does not meet the standards;

[0078] After the cause is determined, a corresponding treatment method is generated based on the determined cause;

[0079] Generate corresponding instructions based on the determined processing method, and transmit the instructions to the corresponding components so that the components adjust the operating parameters to the corresponding values;

[0080] 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 whether the balance management of the energy storage system meets the standard in the next period is determined.

[0081] See also Figure 3 As shown, it is a flow chart of the present invention for determining whether the balancing management of the energy storage system meets the standard. The process of determining whether the balancing management of the energy storage system meets the standard based on the change in the remaining capacity in the embodiment of the present invention includes:

[0082] Calculating an absolute value of an average value of the variation of the remaining capacity, and recording the obtained absolute value of the average value as an average value of the variation of the remaining capacity;

[0083] When the average value of the remaining capacity change is less than or equal to the first preset average value A1 of the remaining capacity change, 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, wherein the first preset average value A1 of the remaining capacity change in this embodiment is 5%;

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

[0085] When the average value of the remaining capacity change is greater than the second preset average value A2 of the remaining capacity change, it is determined that the balance management of the energy storage system does not meet the standards, and the reason why the balance management of the energy storage system does not meet the standards is determined based on the average value difference, wherein the average value difference is the difference between the average value of the remaining capacity change and the second preset average value of the remaining capacity change.

[0086] Please continue reading 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 amount in the embodiment of the present invention includes:

[0087] Establishing a historical cycle-historical average quantity curve based on the historical average quantity;

[0088] Obtaining the slope of the curve at the current period node, and recording the absolute value of the obtained slope as the absolute value of the average slope;

[0089] When the average quantity slope absolute value is greater than a preset average quantity slope absolute value S, it is determined that the balance management of 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 average quantity slope absolute value, wherein the preset average quantity slope absolute value S=1.25 in this embodiment;

[0090] When the average quantity slope absolute value is less than or equal to the preset average quantity slope absolute value 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 reading Figure 3 As shown, the process of determining the reason why the balance management of the energy storage system does not meet the standard based on the absolute value of the average slope in the embodiment of the present invention includes:

[0092] Calculating the difference between the average quantity slope absolute value and the preset average quantity slope absolute value, and recording the obtained difference as the average quantity slope difference;

[0093] When the average quantity slope difference is less than or equal to a preset average quantity slope difference ΔE, it is determined that the current that is the reason why the balance management of the energy storage system does not meet the standard does not meet the standard, and the resistance value of the protection resistor in the protection unit for current limitation is increased based on the average quantity slope difference, wherein the preset average quantity slope difference ΔE=0.35 in this embodiment;

[0094] When the average quantity slope difference is greater than the preset average quantity slope difference ΔE, the reason why the balance management of the energy storage system does not meet the standard is determined based on the average value difference.

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

[0096] Calculating the ratio of the average slope difference to the preset average slope difference, and recording the obtained ratio as the slope difference ratio;

[0097] increasing 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, the resistance value is increased to 1.38 times the initial resistance value, wherein the second preset slope difference ratio P2 in this embodiment is 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, the resistance value is increased to 1.21 times of the initial resistance value, wherein the first preset slope difference ratio P1 in this embodiment is 37.1%;

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

[0101] See also Figure 4 As shown, it is a flow chart of the present invention for determining the reason why the balance management of the energy storage system does not meet the standard. The process of the embodiment of the present invention for determining the reason why the balance management of the energy storage system does not meet the standard based on the average value difference includes:

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

[0103] When the average value difference is less than or equal to a first preset average value difference △D1, it is determined that the reason why the balance management of the energy storage system does not meet the standard is that the temperature inside the battery cluster does not meet the standard, and the rotation speed of the heat dissipation device in the heat dissipation unit for heat dissipation of the battery cluster is increased based on the average value difference ratio, wherein the first preset average value difference △D1 in this embodiment is 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, the reason why the balance management of the energy storage system does not meet the standard is determined based on the variance of the average value difference, wherein the second preset average value difference △D2 in this embodiment is 21%;

[0105] When the average value difference is greater than the second preset average value difference ΔD2, it is determined that the reason why the balance management of the energy storage system does not meet the standard is that the matching degree between the power demand and the stable output of the electric energy does not meet the standard, and a notification of electric energy dispatching is issued.

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

[0107] increasing a rotation speed of the heat sink 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, the rotation speed of the heat sink is increased to 1.56 times the initial rotation speed of the heat sink, wherein the second preset average value difference ratio △B2 in this embodiment is 68.9%;

[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, the rotation speed of the heat sink is increased to 1.35 times the rotation speed of the initial heat sink, wherein the first preset average value difference ratio △B1 in this embodiment is 27.8%;

[0110] When the average value difference ratio is less than or equal to the first preset average value difference ratio ΔB1, the rotation speed of the heat sink is increased to 1.26 times the initial rotation speed of the heat sink.

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

[0112] 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;

[0113] reducing the power of the heat sink based on the average change;

[0114] When the average change is greater than a second preset average change ΔM2, the power of the heat sink is reduced to 0.96 times the power of the initial heat sink, wherein the second preset average change ΔM2 in this embodiment is 62%;

[0115] When the average change is less than or equal to the second preset average change △M2 and greater than the first preset average change △M1, the power of the heat sink is reduced to 0.91 times the power of the initial heat sink, wherein the first preset average change △M1 in this embodiment is 35%;

[0116] When the average change is less than or equal to the first preset average change ΔM1, reducing the power of the heat dissipation device to 0.88 times the power of the initial heat dissipation device;

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

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

[0119] Calculating the variance of the mean value difference, and recording the obtained variance as the mean value difference variance;

[0120] When the variance of the mean value difference is less than or equal to the variance C of the preset mean value difference, it is determined that the reason why the balance management of the energy storage system does not meet the standard is that the temperature inside the battery cluster does not meet the standard, and the speed of the heat dissipation device during heat dissipation is increased based on the mean value difference ratio, wherein the variance C of the preset mean value difference in this embodiment is 0.13;

[0121] When the variance of the mean value difference is greater than the variance C of the preset mean value difference, it is determined that the reason why the balance management of the energy storage system does not meet the standards is that the battery has self-discharge, and the abnormal battery module is determined based on the voltage value of each battery module, and the preset voltage is increased based on the remaining capacity of the abnormal battery module.

[0122] Please continue reading 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] Calculating the difference between the pre-stored preset remaining capacity and the remaining capacity, and recording the obtained difference as the capacity difference;

[0124] Calculating a ratio of the capacity difference to the preset remaining capacity, and recording the obtained ratio as the capacity difference ratio;

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

[0126] When the capacity difference ratio is greater than the second preset capacity difference ratio ΔF2, the preset voltage is increased to 1.26 times of the initial preset voltage, wherein the second preset capacity difference ΔF2 in this embodiment is 72%;

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

[0128] When the capacity difference ratio is less than or equal to the first preset capacity difference ratio ΔF1, the preset voltage is increased to 1.05 times of the initial preset voltage.

[0129] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying 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 description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A balanced control method for an electrochemical energy storage management system, characterized in that: include: The batteries are connected in parallel to form a battery module, and the battery modules are connected in series to form a battery cluster; Performing heat dissipation treatment on the battery cluster storing electrical energy; Limiting the stored electrical energy to a current to stabilize the output; Performing periodic detection on each of the battery modules to obtain the remaining capacity of each battery module in a single cycle, and determining the change of the remaining capacity of each battery module in a single cycle relative to the previous cycle according to the obtained remaining capacity; Determining whether the balancing management of the energy storage system meets the standards based on the change in the remaining capacity, and determining the reason for not meeting the standards based on the change in the remaining capacity when it is determined that the balancing management of the energy storage system does not meet the standards; After the cause is determined, a corresponding treatment method is generated based on the determined cause; Generate corresponding instructions based on the determined processing method, and transmit the instructions to the corresponding components so that the components adjust the operating parameters to the corresponding values; 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 whether the balance management of the energy storage system meets the standard in the next period is determined.

2. The electrochemical energy storage management system balance control method according to claim 1, characterized in that: The process of determining whether the balancing management of the energy storage system meets the standard based on the change in the remaining capacity includes: Calculating an absolute value of an average value of the variation of the remaining capacity, and recording the obtained absolute value of the average value as an average value of the variation of the remaining capacity; Determining whether the balancing management of the energy storage system meets the standard based on the average value of the remaining capacity change, and, when it is determined that the balancing management of the energy storage system does not meet the standard, determining whether the balancing management of the energy storage system meets the standard based on the historical average value, or determining the reason why the balancing management of the energy storage system does not meet the standard based on the average value difference; The historical average is an average value of the remaining capacity changes in the historical period, and the average value difference is a difference between the remaining capacity change average and a pre-stored preset remaining capacity change average.

3. The electrochemical energy storage management system balance control method according to claim 2, characterized in that: The process of determining whether the balancing management of the energy storage system meets the standard based on the historical average quantity includes: Establishing a historical cycle-historical average quantity curve based on the historical average quantity; Obtaining the slope of the curve at the current period node, and recording the absolute value of the obtained slope as the absolute value of the average slope; When the average quantity slope absolute value is greater than a preset average quantity slope absolute value, determining that the balance management of the energy storage system does not meet the standard, and determining the reason why the balance management of the energy storage system does not meet the standard based on the average quantity slope absolute value; When the absolute value of the average slope is less than or equal to the preset absolute value of the average slope, 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.

4. The electrochemical energy storage management system balance control method according to claim 3 is characterized in that: The process of determining the reason why the balance management of the energy storage system does not meet the standard based on the absolute value of the average slope includes: Calculating the difference between the average quantity slope absolute value and the preset average quantity slope absolute value, and recording the obtained difference as the average quantity slope difference; When the average quantity slope difference is less than or equal to a preset average quantity slope difference, determining that the current does not meet the standard for the reason why the balance management of the energy storage system does not meet the standard, and increasing the resistance value of the protection resistor for current limitation based on the average quantity slope difference; When the average quantity slope difference is greater than the preset average quantity slope difference, the reason why the balance management of the energy storage system does not meet the standard is determined based on the average value difference.

5. The electrochemical energy storage management system balance control method according to claim 4, characterized in that: The process of increasing the resistance value of the protection resistor based on the average slope difference includes: Calculating the ratio of the average slope difference to the preset average slope difference, and recording the obtained ratio as the slope difference ratio; The resistance value is increased based on the slope difference ratio, and the increase amplitude of the resistance value is proportional to the slope difference ratio.

6. The electrochemical energy storage management system balance control method according to claim 4, characterized in that: The process of determining the reason why the balancing management of the energy storage system does not meet the standard based on the average value difference includes: Comparing the average value difference with a pre-stored preset average value difference; When the average value difference is less than or equal to a first preset average value difference, it is determined that the reason why the balance management of the energy storage system does not meet the standard 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 of the battery cluster is increased based on the average value difference ratio, wherein the average value difference ratio is a 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, determining the reason why the balance management of the energy storage system does not meet the standard 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 why the balance management of the energy storage system does not meet the standard is that the matching degree between the power demand and the stable output of the electric energy does not meet the standard, and a notification of electric energy dispatching is issued.

7. The electrochemical energy storage management system balance control method according to claim 6, 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: The rotation speed of the heat sink is increased based on the average value difference ratio, and the increase amplitude of the rotation speed of the heat sink is proportional to the average value difference ratio.

8. The electrochemical energy storage management system balance control method according to claim 7, characterized in that: The process of reducing the power of the heat sink based on the average value difference after the rotation speed of the heat sink increases 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; 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.

9. The electrochemical energy storage management system balance control method according to claim 6, characterized in that: The process of determining the reason why the balance management of the energy storage system does not meet the standard based on the variance of the mean value difference includes: Calculating the variance of the mean value difference, and recording the obtained variance as the mean 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, determining that the reason why the balance management of the energy storage system does not meet the standard is that the temperature inside the battery cluster does not meet the standard, and increasing the rotation speed of the heat dissipation device during heat dissipation based on the average value difference ratio; When the variance of the mean value difference is greater than the variance of the preset mean value difference, it is determined that the reason why the balance management of the energy storage system does not meet the standards is that the battery has self-discharge, the abnormal battery module is determined based on the voltage value of each battery module, and the preset voltage is increased based on the remaining capacity of the abnormal battery module.

10. The electrochemical energy storage management system balance control method according to claim 9, characterized in that: 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 a ratio of the capacity difference to the preset remaining capacity, and recording the obtained ratio as the capacity difference ratio; The preset voltage is increased based on the capacity difference ratio, and the increase range of the preset voltage is proportional to the capacity difference ratio.

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