Multi-stage power storage battery charging control method and system based on intelligent dynamic adjustment

Abstract

The invention relates to the technical field of storage battery charging, in particular to a multi-stage power storage battery charging control method and system based on intelligent dynamic adjustment. According to the invention, the pre-charging current is determined through the battery health state value and the initial SOC of each single battery, so that the single batteries are pre-charged through the pre-charging current which is individually designed, and after the pre-charging stage is finished, the constant-current charging current is determined according to the first SOC so as to carry out constant-current charging. The constant-current charging current is made to be matched with the current state of each single battery, then a second SOC of each single battery after constant-current charging is finished is obtained, after it is indicated that the single battery is charged to be close to the full-charge state through the second SOC, a constant-voltage charging voltage is obtained for the second SOC of the single battery to conduct constant-voltage charging, and meanwhile electric quantity transferring is conducted on the single battery; finally, whether the electric quantity of the battery pack is balanced or not is judged, and if the electric quantity is not balanced, the SOC difference between the single batteries is gradually eliminated by continuously optimizing the charging process.

Description

Technical Field

[0001] The present invention relates to the technical field of battery charging, and in particular to a multi-stage power battery charging control method and system based on intelligent dynamic regulation. Background Art

[0002] Multi-stage charging of batteries is a more advanced charging method. It divides the charging process into multiple stages according to the different states and requirements of the battery during the charging process. It mainly includes the pre-charging stage, constant current charging stage and constant voltage charging stage. Each stage uses different charging parameters (such as current, voltage, etc.) to achieve a more efficient, safer and more beneficial charging effect for the battery life.

[0003] However, since the power battery is composed of multiple single cells, the initial state of charge (SOC) of each single cell is different. Although the traditional charging process is divided into multiple stages, each stage uses different charging parameters. However, these parameters are uniformly set for the entire battery pack, and the differences between the single cells are not considered. When the battery is charged, the entire battery pack will be charged at a preset fixed current or voltage value, and the charging parameters cannot be dynamically adjusted according to the actual SOC of each single cell, the battery health status and other individual characteristics. In this way, although the charging stages are divided, for each single cell in the battery pack, there is no personalized charging control for the differences between the single cells, which is a "one-size-fits-all" charging method. In the charging process, the battery with a lower SOC needs to absorb more electrical energy to increase its power, so it will be subjected to a higher charging voltage during the charging process, while the battery with a higher SOC may quickly reach a state close to full charge, and its charging voltage rises slowly. Therefore, during the charging process of the entire battery pack, there will be differences in charging voltage and charging current between different single cells. This difference will lead to unbalanced energy transfer between the single cells, resulting in additional losses, and thus greatly reducing the charging efficiency of the entire battery pack. Summary of the invention

[0004] The main purpose of the present invention is to provide a multi-stage power battery charging control method and system based on intelligent dynamic regulation, aiming to solve the technical problems in the prior art.

[0005] The present invention proposes a multi-stage power battery charging control method based on intelligent dynamic regulation, wherein the power battery comprises a plurality of electrically connected single cells, including:

[0006] Obtaining battery health status values and initial SOCs of a plurality of single cells, and obtaining a pre-charging current according to the battery health status values and the initial SOCs to pre-charge the single cells;

[0007] Obtain the first SOC of multiple single cells after the battery pre-charging is completed, and obtain the constant current charging current according to the first SOC to perform constant current charging on the single cells;

[0008] Obtain the second SOC corresponding to the single cells after the battery constant current charging is completed, and obtain the constant voltage charging voltage according to the second SOC to perform constant voltage charging on the single cells;

[0009] After the single cells complete constant voltage charging, construct a charge transfer matching group according to the second SOC of each single cell, where the charge transfer matching group includes multiple pairwise-matched single cells, and obtain the charge transfer time according to the charge transfer matching group;

[0010] Perform charge transfer on the pairwise-matched single cells during the charge transfer time, and obtain the real-time SOC of each single cell after the charge transfer;

[0011] Obtain the target SOC, and calculate the SOC difference value of each single cell according to the real-time SOC and the target SOC;

[0012] Determine whether the SOC difference value is greater than the difference threshold;

[0013] If all the SOC difference values are not greater than the difference threshold, it is determined that the battery charge is balanced;

[0014] If there is any one of the SOC difference values greater than the difference threshold, it is determined that the battery charge is unbalanced, and then return the real-time SOC as the second SOC to the step of obtaining the constant voltage charging voltage according to the second SOC until the battery charge is balanced.

[0015] Preferably, the step of obtaining the battery health state value and the initial SOC of multiple single cells, and obtaining the pre-charging current according to the battery health state value and the initial SOC to perform pre-charging on the single cells includes:

[0016] Obtain the key parameter information and battery state information of each single cell, where the battery state information includes the initial SOC and historical charge and discharge data;

[0017] Obtain the number of charge and discharge cycles, the single charge and discharge capacity, and the single charge and discharge efficiency according to the historical charge and discharge data, and obtain the actual average capacity according to the number of charge and discharge cycles and the single charge and discharge capacity;

[0018] Obtain the battery rated capacity and battery performance influence coefficient according to the key parameter information, where the battery performance influence coefficient includes the battery capacity attenuation coefficient, the charging efficiency influence coefficient, and the battery characteristic adjustment coefficient;

[0019] Obtain the average charge-discharge efficiency based on the number of charge-discharge cycles and the single charge-discharge efficiency, and obtain the battery health state value based on the average charge-discharge efficiency, the actual average capacity, the battery rated capacity, the number of charge-discharge cycles, the battery capacity attenuation coefficient, and the charging efficiency influence coefficient;

[0020] Obtain the pre-charge current based on the initial SOC, the battery characteristic adjustment coefficient, and the battery health state value of each single battery, and perform pre-charging on the single battery according to the pre-charge current.

[0021] Preferably, the step of obtaining the first SOC of multiple single batteries after the end of battery pre-charging and obtaining the constant current charging current according to the first SOC to perform constant current charging on the single battery includes:

[0022] Obtain the pre-charge state data of the single battery in the pre-charge stage according to the power sensor, wherein the pre-charge state data includes multiple real-time voltage change rates, real-time current values, real-time temperature values, pre-charge open circuit voltage, and pre-charge time;

[0023] Obtain the voltage change rate threshold, and divide the pre-charge time according to the voltage change rate threshold and the real-time voltage change rate to obtain multiple pre-charge time intervals;

[0024] Obtain the pre-charge constant current according to the pre-charge time interval and the corresponding multiple real-time current values, and obtain the total charged amount of each single battery in the pre-charge stage according to the pre-charge constant current and the pre-charge time interval;

[0025] Obtain the maximum output current and the rated resistance of each single battery according to the key parameter information, and obtain the first SOC of each single battery according to the initial SOC, the battery rated capacity, and the total charged amount;

[0026] Obtain the constant current charging current according to the pre-charge open circuit voltage, the maximum output current, the rated resistance, and the average charge-discharge efficiency, and perform constant current charging on the single battery according to the constant current charging current.

[0027] Preferably, the step of obtaining the second SOC corresponding to the single battery after the end of battery constant current charging and obtaining the constant voltage charging voltage according to the second SOC to perform constant voltage charging on the single battery includes:

[0028] Obtain the constant current charging time, and obtain the second SOC according to the constant current charging current, the constant current charging time, and the first SOC;

[0029] Judge whether the second SOC is greater than the preset value;

[0030] If the second SOC is not greater than the preset value, continue with constant current charging;

[0031] If the second SOC is greater than a preset value, constant current charging is stopped, and the constant current open circuit voltage of each single battery is obtained according to the power sensor.

[0032] Obtain the battery characteristic information and the number of charging times of the storage battery, wherein the battery characteristic information includes the basic charging voltage increment, the influence coefficient and the aging coefficient.

[0033] Obtain the constant voltage charging voltage according to the constant current open circuit voltage, the second SOC, the charging voltage increment and the aging coefficient, and perform constant voltage charging on the single battery according to the constant voltage charging voltage.

[0034] Preferably, the step of constructing a power transfer matching group according to the second SOC of each single battery, wherein the power transfer matching group includes a plurality of pairwise-matched single batteries, and obtaining the power transfer time according to the power transfer matching group, includes:

[0035] Obtain the average SOC according to the second SOC of a plurality of single batteries, and obtain the corresponding target difference value according to the second SOC and the average SOC of each single battery.

[0036] Sort the plurality of single batteries in the order of the magnitude of the target difference value to obtain a battery sorting table, and pairwise match the plurality of single batteries according to the battery sorting table to obtain a power transfer matching group.

[0037] Obtain the corresponding constant voltage initial resistance according to the constant current open circuit voltage and the constant current charging current of each single battery, and obtain the corresponding constant voltage initial charging current according to the constant voltage charging voltage and the constant voltage initial resistance of each single battery.

[0038] Obtain the power transfer amount according to the power transfer matching group, and obtain the power transfer time according to the power transfer amount, the charging current decay coefficient and the constant voltage initial charging current, wherein the power transfer time includes the capacitor charging time and the capacitor discharging time.

[0039] Preferably, the step of performing power transfer on the pairwise-matched single batteries during the power transfer time and obtaining the real-time SOC of each single battery after the power transfer includes:

[0040] Control the opening and closing of the corresponding capacitor conduction switch according to the capacitor charging time and the capacitor discharging time respectively to perform power transfer.

[0041] After the power transfer stops, use the larger value of the capacitor charging time and the capacitor discharging time as the constant voltage charging time.

[0042] Obtain a third SOC based on the constant-voltage charging time, the second SOC, and the initial constant-voltage charging current, and obtain the real-time SOC based on the third SOC and the charge transfer amount.

[0043] This application also provides a multi-stage power battery charging control system based on intelligent dynamic regulation, including:

[0044] A first acquisition module, configured to acquire the battery health state values and the initial SOC of multiple single cells, and obtain a pre-charging current according to the battery health state values and the initial SOC to pre-charge the single cells;

[0045] A second acquisition module, configured to acquire the first SOC of multiple single cells after the battery pre-charging ends, and obtain a constant-current charging current according to the first SOC to perform constant-current charging on the single cells;

[0046] A third acquisition module, configured to acquire the second SOC corresponding to the single cell after the battery constant-current charging ends, and obtain a constant-voltage charging voltage according to the second SOC to perform constant-voltage charging on the single cell;

[0047] A matching module, configured to, after the constant-voltage charging of the single cell ends, construct a charge transfer matching group according to the second SOC of each single cell, where the charge transfer matching group includes multiple pairwise-matched single cells, and obtain a charge transfer time according to the charge transfer matching group;

[0048] A fourth acquisition module, configured to perform charge transfer on the pairwise-matched single cells during the charge transfer time, and acquire the real-time SOC of each single cell after the charge transfer;

[0049] A calculation module, configured to acquire a target SOC, and calculate the SOC difference value of each single cell according to the real-time SOC and the target SOC;

[0050] A judgment module, configured to judge whether the SOC difference value is greater than a difference threshold;

[0051] If all the SOC difference values are not greater than the difference threshold, it is determined that the battery power is balanced;

[0052] If there is any one of the SOC difference values greater than the difference threshold, it is determined that the battery power is unbalanced, and the real-time SOC is returned to the step of obtaining the constant-voltage charging voltage according to the second SOC until the battery power is balanced.

[0053] Preferably, the third acquisition module includes:

[0054] A first acquisition unit, configured to acquire the constant-current charging time, and acquire a second SOC according to the constant-current charging current, the constant-current charging time, and the first SOC;

[0055] A judgment unit, configured to judge whether the second SOC is greater than a preset value;

[0056] If the second SOC is not greater than the preset value, continue with constant-current charging;

[0057] If the second SOC is greater than the preset value, stop constant-current charging, and acquire the constant-current open-circuit voltage of each single battery according to a power sensor;

[0058] A second acquisition unit, which acquires battery characteristic information and the number of charging times of a storage battery, wherein the battery characteristic information includes a basic charging voltage increment, an influence coefficient, and an aging coefficient;

[0059] A third acquisition unit, configured to acquire a constant-voltage charging voltage according to the constant-current open-circuit voltage, the second SOC, the charging voltage increment, and the aging coefficient, and perform constant-voltage charging on the single battery according to the constant-voltage charging voltage.

[0060] The present invention also provides a computer device, including a memory and a processor, where the memory stores a computer program, and when the processor executes the computer program, the steps of the above-mentioned multi-stage power battery charging control method based on intelligent dynamic adjustment are implemented.

[0061] The present invention also provides a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, the steps of the above-mentioned multi-stage power battery charging control method based on intelligent dynamic adjustment are implemented.

[0062] The beneficial effects of the present invention are as follows: in the present invention, the pre-charging current is determined by obtaining the battery health status value and the initial SOC of each single cell, so as to pre-charge the single cell. Since the pre-charging current is designed for the single cell, the accurate pre-charging current can not only ensure that each single cell can be charged at an appropriate rate in the initial stage, but also reduce the accumulation of subsequent charging differences caused by different initial states, and alleviate the problem of unbalanced energy transfer. Immediately after the pre-charging stage, the charge state of each single cell after the pre-charging stage is determined by calculating the first SOC, and then the constant current charging current is determined according to the first SOC, so that the charging current in the constant current charging stage is adapted to the current state of each single cell. Then, the second SOC of the single cell after the constant current charging stage is calculated, and the second SOC of the single cell can be judged by the second SOC whether the single cell has been charged to a state close to full charge. If it has been charged to a state close to full charge, the constant current charging can be stopped, and then the charging current can be stopped for the uncharged cells. The second SOC of the same single cell obtains the constant voltage charging voltage, and the single cell is charged at a constant voltage according to the constant voltage charging voltage. At the same time, in the constant voltage charging stage, the power between the single cells is transferred to realize the redistribution of energy in the battery pack. The power transfer process can transfer the energy of the single cell with a fast charging progress to the single cell with a slow charging progress. When the power transfer is completed, the real-time SOC of each single cell is obtained respectively, and the SOC difference value is obtained in combination with the target SOC. Finally, the SOC difference value is compared with the difference threshold to determine whether the battery pack power is balanced. If the power is unbalanced, the real-time SOC is used as the new second SOC to return to the step of adjusting the constant voltage charging voltage. The cycle is repeated until the power is balanced. By continuously optimizing the charging process, the SOC difference between the single cells is gradually eliminated to ensure that each single cell in the battery pack eventually reaches a similar SOC, thereby solving the problem of unbalanced energy transfer caused by different initial SOCs and improving the charging efficiency of the entire battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0063] Figure 1 The figure is a schematic diagram of a method flow of an embodiment of the present application.

[0064] Figure 2 Schematic diagram of the system structure of an embodiment of the present application.

[0065] Figure 3 A schematic diagram of the internal structure of a computer device according to an embodiment of the present application.

[0066] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0067] 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.

[0068] As Figures 1 - 3 shown, this application provides a multi-stage power battery charging control method based on intelligent dynamic adjustment. The power battery includes a plurality of monomer batteries connected electrically, including:

[0069] S1. Obtain the battery health state values and initial SOCs of the plurality of monomer batteries, and obtain a pre-charging current according to the battery health state values and initial SOCs to pre-charge the monomer batteries;

[0070] S2. Obtain the first SOCs of the plurality of monomer batteries after the battery pre-charging ends, and obtain a constant current charging current according to the first SOCs to perform constant current charging on the monomer batteries;

[0071] S3. Obtain the second SOCs corresponding to the monomer batteries after the battery constant current charging ends, and obtain a constant voltage charging voltage according to the second SOCs to perform constant voltage charging on the monomer batteries;

[0072] S4. After the monomer batteries perform constant voltage charging: construct a power transfer matching group according to the second SOCs of each monomer battery, where the power transfer matching group includes a plurality of pairwise-matched monomer batteries, and obtain a power transfer time according to the power transfer matching group;

[0073] S5. Perform power transfer on the pairwise-matched monomer batteries within the power transfer time, and obtain the real-time SOC of each monomer battery after the power transfer;

[0074] S6. Obtain a target SOC, and calculate the SOC difference value of each monomer battery according to the real-time SOC and the target SOC;

[0075] S7. Determine whether the SOC difference value is greater than a difference threshold;

[0076] If all the SOC difference values are not greater than the difference threshold, it is determined that the battery power is balanced;

[0077] If there exists any one of the SOC difference values greater than the difference threshold, it is determined that the battery power is unbalanced, and then the real-time SOC is returned as the second SOC to the step of obtaining the constant voltage charging voltage according to the second SOC until the battery power is balanced.

[0078] As described in the above steps S1-S6, multi-stage charging of the battery is a relatively advanced charging method. It divides the charging process into multiple stages according to the different states and requirements of the battery during the charging process, mainly including a pre-charging stage, a constant current charging stage and a constant voltage charging stage. Different charging parameters (such as current, voltage, etc.) are used in each stage to achieve a more efficient, safer and more conducive to the charging effect of the battery life. However, since the power battery is composed of multiple single cells, the initial state of charge (SOC) of each single cell is different. During the charging process, the battery with a lower SOC needs to absorb more electrical energy to increase its power, so it will be subjected to a higher charging voltage during the charging process, while the battery with a higher SOC may quickly reach a state close to full charge, and its charging voltage rises slowly. Therefore, during the charging process of the entire battery pack, there will be differences in charging voltage and charging current between different single cells. This difference will lead to unbalanced energy transfer between the single cells, resulting in additional losses, and thus greatly reducing the charging efficiency of the entire battery pack.

[0079] In the present invention, by obtaining the battery health state value and the initial SOC of the single battery, the pre-charge current can be designed individually for the single battery. Among them, the initial SOC refers to the state of charge of the single battery before charging, and the battery health state value refers to the value calculated by a specific algorithm and used to quantitatively represent the health degree of the power battery. The battery health state value comprehensively considers factors such as the aging degree and performance degradation of the battery, and can help the charging control system understand the actual condition of the battery. The pre-charge current refers to the current flowing through the single battery during the pre-charge stage. The differences in the charging current and charging voltage caused by the traditional multi-stage charging method are uncontrollable. However, designing the pre-charge current individually according to the actual condition of the single battery can enable the subsequent charging control to be adjusted based on the actual situation, improve the accuracy and pertinence of the charging control, avoid "one-size-fits-all" charging, and can gently activate the single battery at the initial stage of charging. The accurate setting of the pre-charge current can ensure that each single battery can receive charging at an appropriate rate in the initial stage, reduce the influence of the initial difference on the subsequent charging, not only can avoid damage to the single battery with low SOC or large performance differences caused by large current, but also can avoid the problem that the single battery with high SOC receives small current and the pre-charge time is extended, and reduce the accumulation of subsequent charging differences caused by different initial states. Then, after the pre-charge stage ends, obtain the first SOC of each single battery. Among them, the first SOC refers to the state of charge of each single battery calculated at the end of the pre-charge stage. Then, determine the constant current charging current according to the first SOC. Among them, the constant current charging current refers to the current flowing through the single battery during the constant current charging stage, and perform constant current charging on the single battery according to the constant current charging current, so that the charging current in the constant current charging stage adapts to the current state of each single battery. Immediately after that, obtain the second SOC corresponding to the single battery after the constant current charging of the battery ends. Among them, the second SOC refers to the state of charge of the battery at the end of the constant current charging stage. Then, judge whether the single battery has been charged to a state close to full charge through the second SOC. If it has been charged to a state close to full charge, the constant current charging can be stopped. Then, obtain the constant voltage charging voltage for different single batteries according to the second SOC. Among them, the constant voltage charging voltage refers to the constant voltage value applied to the single battery during the constant voltage charging stage, and perform constant voltage charging on the single battery according to the constant voltage charging voltage. This method of determining the constant voltage charging voltage can enable the single batteries with different states of charge to still maintain a reasonable charging state during the constant voltage charging stage when entering the constant voltage charging stage. At the same time, when the constant current charging ends and the constant voltage charging is about to start, determine the charge transfer matching group according to the second SOC of each single battery. Among them, the charge transfer matching group refers to the combination of single batteries for charge transfer determined according to the battery sorting table, including a single battery with high SOC and a single battery with low SOC. A capacitor is connected between the single battery with high SOC and the single battery with low SOC in the charge transfer matching group.As a component capable of storing and releasing electrical energy, a capacitor can act as a bridge for charge transfer between single cells in different charged states. By controlling the opening and closing states of the conduction switches connecting the capacitor and the single cells, the direction of the current can be determined, thereby realizing the transfer of charge from the single cell with a high SOC to the single cell with a low SOC. Therefore, after obtaining the charge transfer time according to the charge transfer matching group, the opening and closing times of the capacitor conduction switches are controlled according to the charge transfer time, so as to realize charge transfer. Among them, the charge transfer time refers to the time required for the paired single cells to complete charge transfer. Through charge transfer, the energy of the single cell with a fast charging progress can be transferred to the single cell with a slow charging progress, so as to balance the energy between the single cells and realize the redistribution of the energy in the battery pack, thereby reducing the uneven energy transfer caused by the SOC difference. When the charge transfer is completed, the constant voltage charging is stopped at the same time, and then the real-time SOC of each single cell is obtained. Among them, the real-time SOC refers to the charged state of the single cell after constant voltage charging and charge transfer. Finally, the SOC difference value is obtained according to the difference between the real-time SOC and the target SOC. Among them, the target SOC refers to the charged state expected to be reached at the end of the charging process, and the SOC difference value refers to the value reflecting the deviation degree between the current battery charge state and the target charge state. Then, the SOC difference value is compared with the difference threshold to judge whether the battery pack charge is balanced. If the charge is not balanced, the real-time SOC is returned as the new second SOC to the step of adjusting the constant voltage charging voltage, and the cycle continues until the charge is balanced. Through the closed-loop feedback control mechanism, the charging process can be continuously optimized, the SOC difference between single cells can be gradually eliminated, and it is ensured that the single cells in the battery pack finally reach similar SOCs, so as to solve the problem of uneven energy transfer caused by different initial SOCs and improve the charging efficiency of the entire battery pack.

[0080] In one embodiment, step S1 of obtaining the battery health state values and the initial SOCs of multiple single cells and obtaining a pre-charge current according to the battery health state values and the initial SOCs to pre-charge the single cells includes:

[0081] S11. Obtain the key parameter information and battery state information of each single cell, where the battery state information includes the initial SOC and historical charge and discharge data;

[0082] S12. Obtain the number of charge and discharge cycles, the single charge and discharge capacity, and the single charge and discharge efficiency according to the historical charge and discharge data, and obtain the actual average capacity according to the number of charge and discharge cycles and the single charge and discharge capacity;

[0083] S13. Obtain the battery rated capacity and the battery performance influence coefficients according to the key parameter information, where the battery performance influence coefficients include a battery capacity attenuation coefficient, a charging efficiency influence coefficient, a battery characteristic adjustment coefficient, and a charging current attenuation coefficient;

[0084] S14. Obtain the average charge-discharge efficiency according to the number of charge-discharge cycles and the single charge-discharge efficiency, and calculate the state of health (SOH) value of the battery according to the average charge-discharge efficiency, the actual average capacity, the battery rated capacity, the number of charge-discharge cycles, the battery capacity attenuation coefficient, and the charging efficiency influence coefficient, where the calculation formula is:

[0085]

[0086] where SOH represents the state of health value of the battery, C rated represents the battery rated capacity, C avg represents the actual average capacity, N represents the number of charge-discharge cycles, E avg represents the average charge-discharge efficiency, α represents the battery capacity attenuation coefficient, and β represents the charging efficiency influence coefficient;

[0087] S15. Calculate the pre-charge current according to the initial SOC, the battery characteristic adjustment coefficient, and the state of health value of each single battery, and pre-charge the single battery according to the pre-charge current, where the calculation formula is:

[0088] I pre = k1 * (1 - SOC initial ) * SOH;

[0089] where I pre represents the pre-charge current, k1 represents the battery characteristic adjustment coefficient, SOC initial represents the initial SOC, and SOH represents the state of health value of the battery.

[0090] As described in the above steps S11 - S15, in the present invention, by obtaining the key parameter information and battery state information of each single battery, the battery energy storage system can be comprehensively understood. Among them, the key parameter information refers to some important characteristic parameters of the single battery, such as the internal resistance, capacitance, inductance, rated capacity, maximum output current, charging efficiency, and rated resistance of the single battery. These parameters reflect the electrical characteristics of the single battery during the charging and discharging process and are crucial for accurately describing the performance of the single battery. The battery state information refers to a set of various data reflecting the current and historical conditions of the single battery, including the initial SOC and historical charge - discharge data of multiple single batteries. Among them, the initial SOC refers to the state of charge of the single battery before charging, and the historical charge - discharge data refers to the relevant records of each charge - discharge process of the single battery in the past, including parameters such as charge - discharge time, charge - discharge cycle times, single - charge - discharge capacity, and single - charge - discharge efficiency. By comprehensively understanding the initial conditions and historical performance of the single battery, the subsequent charging control can be adjusted based on the actual situation, improving the accuracy and pertinence of the charging control. Then, based on the historical charge - discharge data, the charge - discharge cycle times, single - charge - discharge capacity, and single - charge - discharge efficiency are obtained. Among them, the charge - discharge cycle times refer to the number of complete processes from a fully charged state to a fully discharged state and then back to a fully charged state of the single battery. This parameter reflects the number of charge - discharge cycles experienced by the single battery and has an important impact on the life and performance of the single battery. Generally speaking, the more cycles, the more obvious the performance degradation of the single battery. The single - charge - discharge capacity refers to the amount of electric charge that the single battery can charge or discharge during a complete charge - discharge process, reflecting the actual capacity change of the single battery during each charge - discharge process. The single - charge - discharge efficiency refers to the ratio of the actual amount of electric charge charged or discharged to the theoretically chargeable or dischargeable amount of electric charge during a single charge - discharge process of the single battery. It reflects the energy conversion efficiency of the single battery during the charge - discharge process. The higher the efficiency, the smaller the energy loss of the battery during the charge - discharge process. And based on the single - charge - discharge capacity and charge - discharge cycle times, the actual average capacity is obtained. Among them, the actual average capacity refers to the value obtained by statistically averaging the single - charge - discharge capacities in multiple charge - discharge cycles. Based on the single - charge - discharge efficiency and charge - discharge cycle times, the average charge - discharge efficiency is obtained. Among them, the average charge - discharge efficiency refers to the value obtained by statistically averaging the single - charge - discharge efficiencies in multiple charge - discharge cycles. Immediately afterwards, based on the key parameter information, the battery rated capacity and the battery performance influence coefficient are obtained. Among them, the battery rated capacity refers to the standard capacity specified during the design and manufacture of the battery, and the battery performance influence coefficient refers to a parameter used to comprehensively consider the influence of various factors on the battery performance, including the battery capacity attenuation coefficient, charging efficiency influence coefficient, battery characteristic adjustment coefficient, and charging current attenuation coefficient, etc. These coefficients are used to quantify the influence degree of different factors on the battery performance in order to more accurately evaluate the battery state during the charging control.The capacity of a single battery usually decays gradually with the increase of the number of charge and discharge cycles, and this decay often takes an exponential form. This item reflects the exponential decay characteristics of battery capacity with the number of cycles N. α determines the rate at which battery capacity decays. This part indicates the ratio of the current average actual capacity of the battery to the rated capacity. As the battery uses this ratio, it will gradually decrease, which intuitively reflects the degree of battery capacity attenuation. As the battery ages, its internal resistance increases, and the charging and discharging efficiency will gradually decrease. This item takes into account the impact of charge and discharge efficiency on battery health status. Through these three parts, the attenuation of battery capacity with the number of cycles, the relationship between actual capacity and rated capacity, and the impact of charge and discharge efficiency on battery health status are comprehensively considered, which can more comprehensively reflect the health status of the battery. Then, according to the initial SOC of each single cell, the battery characteristic adjustment coefficient and the battery health status value, the pre-charge current is calculated using the given formula, and the single cell is pre-charged according to the calculated pre-charge current. Among them, k1 is a proportional coefficient related to the battery type, which is a quantitative reflection of the differentiation of different batteries. (1-SOC initial ) reflects the relationship between the initial state of charge of the battery and the charging demand. SOH reflects the aging degree and performance degradation of the single cell. Different single cells require different pre-charging currents due to differences in initial SOC, battery characteristics and health status. Through this personalized setting, it can ensure that each single cell can be charged at an appropriate rate in the initial stage, avoiding large currents from damaging single cells with low SOC or large performance differences, and also preventing high SOC single cells from receiving small currents, which prolongs the pre-charging time.

[0091] In one embodiment, the step S2 of obtaining a first SOC of a plurality of single cells after the battery pre-charging is completed, and obtaining a constant current charging current according to the first SOC to perform constant current charging on the single cells, includes:

[0092] S21, obtaining pre-charging state data of the single battery in the pre-charging stage according to the power sensor, wherein the pre-charging state data includes a plurality of real-time voltage change rates, real-time current values, real-time temperature values, pre-charging open circuit voltages and pre-charging time;

[0093] S22, obtaining a voltage change rate threshold, and dividing the pre-charging time according to the voltage change rate threshold and the real-time voltage change rate to obtain a plurality of pre-charging time intervals;

[0094] S23, obtaining a pre-charging constant current according to the pre-charging time interval and the corresponding multiple real-time current values, and obtaining a total amount of electricity charged into each single cell during the pre-charging stage according to the pre-charging constant current and the pre-charging time interval;

[0095] S24. Obtain the maximum output current and rated resistance of each single battery according to the key parameter information, and obtain the first SOC of each single battery according to the initial SOC, battery rated capacity, and total charged power.

[0096] S25. Obtain the constant current charging current according to the pre-charging open circuit voltage, maximum output current, rated resistance, and average charge and discharge efficiency, and perform constant current charging on the single battery according to the constant current charging current.

[0097] As described in the above steps S21 - S25, in the present invention, the pre - charge status data in the pre - charge stage is obtained through a power sensor. Among them, the pre - charge status data refers to various relevant data recorded during the pre - charge process of a single battery, including multiple real - time voltage change rates, real - time current values, real - time temperature values, pre - charge open - circuit voltage, and pre - charge time. These data can reflect the actual situation of the pre - charge process and provide a reference for the subsequent charge stage. Among them, the real - time voltage change rate refers to the rate at which the voltage of a single battery changes with time during the charge process. The real - time current value refers to the magnitude of the current flowing through a single battery at a certain moment during the charge process. The real - time temperature value refers to the actual temperature of a single battery at a certain moment during the charge process. The pre - charge open - circuit voltage refers to the potential difference between the positive and negative electrodes of the battery when the single battery is in an open - circuit state after the pre - charge ends and before the constant - current charge starts. The pre - charge time refers to the duration of the pre - charge process of a single battery. These data can reflect the dynamic characteristics of a single battery in the pre - charge stage and provide a basis for subsequent analysis and control of the charge process. Then, the real - time voltage change rate is compared with a pre - determined voltage change rate threshold. Among them, the voltage change rate threshold is a value used to measure whether the real - time voltage change rate of a single battery exceeds the normal range. When the real - time voltage change rate first exceeds the voltage change rate threshold, it is considered that a stage change has occurred in the pre - charge process, and this moment is taken as the end point of a time interval and the starting point of the next time interval. Then continue to monitor. When the real - time voltage change rate changes significantly again (for example, exceeds the threshold again), a new time interval is determined. In this way, the entire pre - charge time is divided into multiple different pre - charge time intervals. Among them, the pre - charge time interval refers to several time periods obtained by dividing the entire pre - charge time. Through this division method, the charge process can be dynamically divided into different stages according to the actual voltage change of the battery during the charge process, so as to more precisely control the charge process. Then, the pre - charge constant current is obtained according to the pre - charge time interval and the corresponding multiple real - time current values. Among them, the pre - charge constant current refers to the average current value within a specific time interval. Then, according to the pre - charge constant current and the pre - charge time interval, the total charge input for each single battery in the pre - charge stage is calculated. Among them, the total charge input refers to the total charge input for each single battery in the pre - charge stage. The calculation formula for the total charge input is: Where, Q charge represents the total charge input of a single battery, n represents the number of pre - charge time intervals, k represents the serial number of the pre - charge time interval, i k represents the pre - charge constant current of the k - th pre - charge time interval, Δt kDenote the k-th pre-charging time interval. The total charge input is directly related to the change in the battery's SOC. By accurately calculating the charge input, the energy accumulation of the battery during the pre-charging stage can be understood. Then, based on the key parameter information, the maximum output current and rated resistance of each single battery are obtained. Among them, the maximum output current refers to the maximum current value that a single battery can provide under safe operating conditions, and the rated resistance refers to the inherent resistance value inside a single battery. And the first SOC of each single battery is obtained based on the initial SOC, rated capacity, and total charge input. The calculation formula for the first SOC is as follows: Among them, SOC1 represents the first SOC, SOC0 represents the initial SOC, Q charge represents the total charge input of the single battery, Q rated represents the rated capacity. By comprehensively considering multiple key parameters, the calculated first SOC can accurately reflect the actual charging state of each single battery after the pre-charging stage. Then, based on the pre-charging open-circuit voltage, maximum output current, rated resistance, and average charge-discharge efficiency, the constant-current charging current is calculated. The calculation formula for the constant-current charging current is as follows: Among them, I max represents the maximum output current, U represents the pre-charging open-circuit voltage, η represents the average charge-discharge efficiency, and R represents the rated resistance. Through the comprehensive calculation of these parameters, the constant-current charging current suitable for the current state of the single battery can be determined, providing appropriate charging parameters for the constant-current charging stage.

[0098] In one embodiment, the step S3 of obtaining the second SOC corresponding to the single battery after the constant-current charging of the battery and obtaining the constant-voltage charging voltage based on the second SOC to perform constant-voltage charging on the single battery includes:

[0099] S31. Obtain the constant-current charging time, and obtain the second SOC based on the constant-current charging current, constant-current charging time, and first SOC;

[0100] S32. Determine whether the second SOC is greater than a preset value;

[0101] If the second SOC is not greater than the preset value, continue with the constant-current charging;

[0102] If the second SOC is greater than the preset value, stop the constant-current charging, and obtain the constant-current open-circuit voltage of each single battery according to the battery charge sensor;

[0103] S33. Obtain the battery characteristic information and the number of charging times of the storage battery. Among them, the battery characteristic information includes the basic charging voltage increment, influence coefficient, and aging coefficient;

[0104] S34. Obtain the constant-voltage charging voltage based on the constant-current open-circuit voltage, the second SOC, the charging voltage increment, and the aging coefficient, and perform constant-voltage charging on the single battery according to the constant-voltage charging voltage.

[0105] As described in the above steps S31 - S34, in the present invention, the constant-current charging time is obtained, where the constant-current charging time refers to the duration during which the single battery is charged in a constant-current charging mode. Combining the constant-current charging current and the first SOC, the SOC of each single battery at the end of the constant-current charging stage, that is, the second SOC, is calculated using the ampere-hour integration method. The formula for the second SOC is: where SOC2 represents the second SOC, SOC1 represents the first SOC, t represents the constant-current charging time, I(τ) is the function of the constant-current charging current with respect to time, and Q rated is the rated capacity of the single battery. By tracking the change in the state of charge of the single battery during the constant-current charging process, the charging progress of the single battery can be accurately grasped, providing an accurate data basis for subsequent judgment of the charging state and taking corresponding measures. Then, the calculated second SOC is compared with a preset value to determine whether the termination condition of the constant-current charging stage is reached. The preset value is the state of charge set in advance for determining when the single battery stops constant-current charging and enters constant-voltage charging. If the second SOC is not greater than the preset value, it indicates that the battery has not been charged to a sufficient amount of electricity and needs to continue constant-current charging. If the second SOC is greater than the preset value, the constant-current charging is stopped and the constant-voltage charging stage is entered. By setting clear judgment conditions, the charging method can be flexibly adjusted according to the charging state of the battery. This adaptive charging control strategy can avoid overcharging or undercharging, improving the safety and efficiency of charging. Then, the constant-current open-circuit voltage of each single battery is obtained through the power sensor. The constant-current open-circuit voltage refers to the open-circuit voltage of the single battery after the constant-current charging stage. The battery characteristic information of the storage battery and the number of charging times are also obtained. The battery characteristic information refers to various parameters related to the performance and characteristics of the battery, such as the basic charging voltage increment, the influence coefficient, and the aging coefficient, etc. The basic charging voltage increment refers to the increase in voltage during the charging process relative to the initial voltage of the battery or a certain reference voltage under specific charging conditions. The influence coefficient is a value used to measure the degree of influence of the SOC change on the charging voltage. The aging coefficient is a parameter reflecting the influence of the battery aging degree on the charging voltage. The number of charging times refers to the number of times a single battery undergoes a complete charging process starting from any state of charge. By obtaining these parameters, the influence of the individual differences and aging factors of the single battery on the charging voltage can be considered, making the charging process more in line with the actual situation of the battery and enabling a more personalized charging plan to be formulated for each single battery. Then, the constant-voltage charging voltage is calculated based on the constant-current open-circuit voltage, the second SOC, the charging voltage increment, and the aging coefficient. The calculation formula is: Vcv = V oc + k * SOC2 + ΔV * α, where V cv refers to the constant voltage charging voltage, V oc refers to the constant current open - circuit voltage, k refers to the influence coefficient, SOC2 refers to the second SOC, ΔV refers to the charging voltage increment, and α refers to the aging coefficient. Through this calculation method that comprehensively considers multiple factors, the constant voltage charging voltage can be accurately determined according to the real - time state and characteristics of the battery, ensuring that the battery can be fully charged during the constant voltage charging stage without being damaged due to excessive voltage.

[0106] In one embodiment, the step S4 of constructing a power transfer matching group according to the second SOC of each single - cell battery, where the power transfer matching group includes multiple pairwise - matched single - cell batteries, and obtaining the power transfer time according to the power transfer matching group, includes:

[0107] S41. Obtain the average SOC according to the second SOC of multiple single - cell batteries, and obtain the corresponding target difference value according to the second SOC and the average SOC of each single - cell battery;

[0108] S42. Sort the multiple single - cell batteries in the order of the size of the target difference value to obtain a battery sorting table, and pairwise - match the multiple single - cell batteries according to the battery sorting table to obtain a power transfer matching group;

[0109] S43. Obtain the corresponding constant - voltage initial resistance according to the constant - current open - circuit voltage and the constant - current charging current of each single - cell battery, and obtain the corresponding constant - voltage initial charging current according to the constant - voltage charging voltage and the constant - voltage initial resistance of each single - cell battery;

[0110] S44. Obtain the power transfer amount according to the power transfer matching group, and obtain the power transfer time according to the power transfer amount, the charging current decay coefficient, and the constant - voltage initial charging current, where the power transfer time includes the capacitor charging time and the capacitor discharging time.

[0111] As described in the above steps S41 - S44, in the present invention, the average SOC of multiple single - cell batteries is calculated to reflect the current state of charge of the storage battery. Among them, the average SOC is the value obtained by averaging the second SOC of multiple single - cell batteries. Then, the target difference value is obtained according to the difference between the second SOC of each single - cell battery and the average SOC. Among them, the target difference value is the difference between the third SOC of each single - cell battery and the average SOC. The target difference value can intuitively reflect the degree of deviation of each single - cell battery from the average state of charge of the battery pack, and the multiple single - cell batteries are sorted according to the magnitude order of the target difference value to obtain a battery sorting table. Among them, the battery sorting table is a table obtained by sorting multiple single - cell batteries according to the magnitude order of the target difference value. This method of sorting based on the difference value helps to optimize the power transfer process, improve the efficiency and accuracy of power balance, make the power transfer more targeted, reduce unnecessary power adjustment, and then determine the power transfer matching group according to the battery sorting table. Among them, the power transfer matching group is a combination of single - cell batteries for power transfer determined according to the battery sorting table, so as to transfer power from single - cell batteries with high SOC to single - cell batteries with low SOC in the subsequent process, thereby narrowing the power difference between single - cell batteries in the battery pack. Considering that the internal resistance of the battery will change with the charging process and the usage state of the battery, first calculate the constant - voltage initial resistance according to the constant - current open - circuit voltage and the constant - current charging current. Among them, the constant - voltage initial resistance is the resistance that a single - cell battery has when the constant - current charging stage ends and is about to enter the constant - voltage charging stage. Then, combine the constant - voltage charging voltage to obtain the constant - voltage initial charging current. Among them, the constant - voltage initial charging current is the charging current flowing through each single - cell battery at the beginning of the constant - voltage charging stage, and obtain the power transfer amount according to half of the power difference between two single - cell batteries in the power transfer matching group. Then, calculate the capacitor charging time and the capacitor discharging time. The calculation formula for the capacitor charging time is: Where t represents the capacitor charging time, Q represents the power transfer amount, k represents the charging current decay coefficient, and I0 represents the constant - voltage initial charging current of the single - cell battery with high SOC. Similarly, the capacitor discharging time can be calculated. By accurately calculating the power transfer time, the charging and discharging processes of the capacitor can be reasonably arranged to ensure the accuracy and stability of the power transfer.

[0112] In one embodiment, step S5 of performing power transfer on pairwise - matched single - cell batteries during the power transfer time and obtaining the real - time SOC of each single - cell battery after the power transfer includes:

[0113] S51. Control the opening and closing of the corresponding capacitor conduction switch according to the capacitor charging time and the capacitor discharging time respectively to perform power transfer;

[0114] S52. After the power transfer stops, use the larger value of the capacitor charging time and the capacitor discharging time as the constant voltage charging time;

[0115] S53. Obtain a third SOC based on the constant voltage charging time, the second SOC, and the initial constant voltage charging current, and obtain the real-time SOC based on the third SOC and the power transfer amount.

[0116] As described in the above steps S51 - S53, the present invention precisely controls the opening and closing of the capacitor conduction switch according to the calculated capacitor charging time and capacitor discharging time to achieve power transfer between single-cell battery groups. By transferring power from the single-cell with a higher power in the power transfer matching group to the single-cell with a lower power, the power distribution of the entire battery group can be made more uniform. Since constant voltage charging and power transfer are carried out simultaneously, and when the power transfer is completed, the constant voltage charging stops simultaneously. Therefore, the larger value of the capacitor charging time and the capacitor discharging time is used as the constant voltage charging time, and the third SOC is obtained by using the ampere-hour integration method in combination with the constant voltage charging time, the second SOC, and the initial constant voltage charging current. Here, the third SOC refers to the state of charge of the single-cell battery after constant voltage charging. Then, the real-time SOC is obtained based on the sum of the third SOC and the power transfer amount. The real-time SOC can dynamically display the state of charge of the single-cell battery after the power transfer and constant voltage charging are completed, providing accurate data support for subsequent analysis and control.

[0117] This application also provides a multi-stage power battery charging control system based on intelligent dynamic regulation, including:

[0118] A first acquisition module, configured to acquire the battery health state values and the initial SOC of multiple single-cell batteries, and obtain a pre-charging current based on the battery health state values and the initial SOC to pre-charge the single-cell batteries;

[0119] A second acquisition module, configured to acquire the first SOC of multiple single-cell batteries after the battery pre-charging is completed, and obtain a constant current charging current based on the first SOC to perform constant current charging on the single-cell batteries;

[0120] A third acquisition module, configured to acquire the second SOC corresponding to the single-cell battery after the battery constant current charging is completed, and obtain a constant voltage charging voltage based on the second SOC to perform constant voltage charging on the single-cell batteries;

[0121] A matching module, configured to, after the constant voltage charging of the single-cell battery is completed, construct a power transfer matching group according to the second SOC of each single-cell battery, where the power transfer matching group includes multiple pairwise-matched single-cell batteries, and obtain a power transfer time according to the power transfer matching group;

[0122] A fourth acquisition module, configured to perform power transfer on pairwise-matched single cells during the power transfer time, and acquire the real-time SOC of each single cell after the power transfer;

[0123] A calculation module, configured to acquire a target SOC, and calculate the SOC difference value of each single cell according to the real-time SOC and the target SOC;

[0124] A judgment module, configured to judge whether the SOC difference value is greater than a difference threshold;

[0125] If all the SOC difference values are not greater than the difference threshold, it is determined that the battery power is balanced;

[0126] If there exists any one of the SOC difference values greater than the difference threshold, it is determined that the battery power is unbalanced, and then the real-time SOC is returned as the second SOC to the step of obtaining the constant voltage charging voltage according to the second SOC until the battery power is balanced.

[0127] In one embodiment, the third acquisition module includes:

[0128] A first acquisition unit, configured to acquire the constant current charging time, and acquire the second SOC according to the constant current charging current, the constant current charging time, and the first SOC;

[0129] A judgment unit, configured to judge whether the second SOC is greater than a preset value;

[0130] If the second SOC is not greater than the preset value, continue with the constant current charging;

[0131] If the second SOC is greater than the preset value, stop the constant current charging, and acquire the constant current open-circuit voltage of each single cell according to the power sensor;

[0132] A second acquisition unit, which acquires the battery characteristic information and the number of charging times of the battery, wherein the battery characteristic information includes the basic charging voltage increment, the influence coefficient, and the aging coefficient;

[0133] A third acquisition unit, configured to acquire the constant voltage charging voltage according to the constant current open-circuit voltage, the second SOC, the charging voltage increment, and the aging coefficient, and perform constant voltage charging on the single cell according to the constant voltage charging voltage.

[0134] The present invention also provides a computer device, including a memory and a processor, where the memory stores a computer program, and when the processor executes the computer program, the steps of the above-mentioned multi-stage power battery charging control method based on intelligent dynamic adjustment are implemented.

[0135] The present invention also provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps of the above-mentioned multi-stage power battery charging control method based on intelligent dynamic adjustment are implemented.

[0136] Those of ordinary skill in the art can understand that all or part of the processes in the methods of the above embodiments can be completed by instructing relevant hardware through a computer program. The computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above methods. Among them, any reference to a memory, storage, database, or other medium provided in this application and used in the embodiments can include non-volatile and / or volatile memories. Non-volatile memories can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), or flash memory. Volatile memories can include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in various forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (SSRSDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM), etc.

[0137] It should be noted that in this article, the terms "including", "comprising", or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, device, article, or method including a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, device, article, or method. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of additional identical elements in the process, device, article, or method including that element.

[0138] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structure or equivalent process transformation made by using the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, shall be equally included in the patent protection scope of the present invention.

Claims

1. A multi-stage power battery charging control method based on intelligent dynamic regulation, wherein the power battery comprises a plurality of electrically connected single cells, characterized in that, Including: Obtain the battery health state values and initial SOCs of multiple single cells, and obtain a pre-charge current according to the battery health state values and initial SOCs to pre-charge the single cells; Obtain the first SOCs of multiple single cells after the battery pre-charge ends, and obtain a constant current charge current according to the first SOCs to perform constant current charging on the single cells; Obtain the second SOCs corresponding to the single cells after the battery constant current charging ends, and obtain a constant voltage charge voltage according to the second SOCs to perform constant voltage charging on the single cells; After the constant voltage charging of the single cells ends, construct a charge transfer matching group according to the second SOCs of each single cell, where the charge transfer matching group includes multiple pairwise-matched single cells, and obtain a charge transfer time according to the charge transfer matching group; Perform charge transfer on the pairwise-matched single cells within the charge transfer time, and obtain the real-time SOC of each single cell after the charge transfer; Obtain a target SOC, and calculate the SOC difference value of each single cell according to the real-time SOC and the target SOC; Judge whether the SOC difference value is greater than a difference threshold; If all the SOC difference values are not greater than the difference threshold, it is determined that the battery charge is balanced; If there is any one of the SOC difference values greater than the difference threshold, it is determined that the battery charge is unbalanced, and then the real-time SOC is returned as the second SOC to the step of obtaining the constant voltage charge voltage according to the second SOC until the battery charge is balanced.

2. The multi-stage power battery charging control method based on intelligent dynamic adjustment according to claim 1, wherein, The step of obtaining the battery health state values and initial SOCs of multiple single cells, and obtaining a pre-charge current according to the battery health state values and initial SOCs to pre-charge the single cells includes: Obtain the key parameter information and battery state information of each single cell, where the battery state information includes the initial SOC and historical charge and discharge data; Obtain the number of charge and discharge cycles, single charge and discharge capacity, and single charge and discharge efficiency according to the historical charge and discharge data, and obtain the actual average capacity according to the number of charge and discharge cycles and the single charge and discharge capacity; Obtain the battery rated capacity and battery performance influence coefficients according to the key parameter information, where the battery performance influence coefficients include a battery capacity attenuation coefficient, a charge efficiency influence coefficient, and a battery characteristic adjustment coefficient; Obtain the average charge and discharge efficiency according to the number of charge and discharge cycles and the single charge and discharge efficiency, and obtain the battery health state value according to the average charge and discharge efficiency, the actual average capacity, the battery rated capacity, the number of charge and discharge cycles, the battery capacity attenuation coefficient, and the charge efficiency influence coefficient; Obtain a pre-charge current according to the initial SOC, the battery characteristic adjustment coefficient, and the battery health state value of each single cell, and pre-charge the single cell according to the pre-charge current.

3. The multi-stage power battery charging control method based on intelligent dynamic adjustment according to claim 2, wherein, The step of obtaining the first SOCs of multiple single cells after the battery pre-charge ends, and obtaining a constant current charge current according to the first SOCs to perform constant current charging on the single cells includes: Obtain the pre-charging state data of a single cell during the pre-charging stage according to a power sensor, wherein the pre-charging state data includes a plurality of real-time voltage change rates, real-time current values, real-time temperature values, pre-charging open-circuit voltage, and pre-charging time; Obtain a voltage change rate threshold, and divide the pre-charging time according to the voltage change rate threshold and the real-time voltage change rate to obtain a plurality of pre-charging time intervals; Obtain a pre-charging constant current according to the pre-charging time interval and the corresponding plurality of real-time current values, and obtain the total charged power of each single cell during the pre-charging stage according to the pre-charging constant current and the pre-charging time interval; Obtain the maximum output current and rated resistance of each single cell according to the key parameter information, and obtain the first SOC of each single cell according to the initial SOC, battery rated capacity, and total charged power; Obtain a constant-current charging current according to the pre-charging open-circuit voltage, maximum output current, rated resistance, and average charge-discharge efficiency, and perform constant-current charging on the single cell according to the constant-current charging current.

4. A multi-stage power battery charging control method based on intelligent dynamic adjustment according to claim 3, characterized in that, The step of obtaining the second SOC corresponding to each single cell after the constant-current charging of the battery and obtaining a constant-voltage charging voltage according to the second SOC to perform constant-voltage charging on the single cell includes: Obtain the constant-current charging time, and obtain the second SOC according to the constant-current charging current, constant-current charging time, and first SOC; Judge whether the second SOC is greater than a preset value; If the second SOC is not greater than the preset value, continue with constant-current charging; If the second SOC is greater than the preset value, stop constant-current charging, and obtain the constant-current open-circuit voltage of each single cell according to a power sensor; Obtain the battery characteristic information and charging times of the storage battery, wherein the battery characteristic information includes a basic charging voltage increment, influence coefficient, and aging coefficient; Obtain a constant-voltage charging voltage according to the constant-current open-circuit voltage, second SOC, charging voltage increment, and aging coefficient, and perform constant-voltage charging on the single cell according to the constant-voltage charging voltage.

5. A multi-stage power battery charging control method based on intelligent dynamic adjustment according to claim 4, characterized in that, The step of constructing a power transfer matching group according to the second SOC of each single cell, wherein the power transfer matching group includes a plurality of pairwise-matched single cells, and obtaining a power transfer time according to the power transfer matching group includes: Obtain an average SOC according to the second SOC of a plurality of single cells, and obtain a corresponding target difference value according to the second SOC and the average SOC of each single cell; Sort a plurality of single cells in the order of the magnitude of the target difference value to obtain a battery sorting table, and pairwise match the plurality of single cells according to the battery sorting table to obtain a power transfer matching group; Obtain a corresponding constant-voltage initial resistance according to the constant-current open-circuit voltage and constant-current charging current of each single cell, and obtain a corresponding constant-voltage initial charging current according to the constant-voltage charging voltage and constant-voltage initial resistance of each single cell; Obtain a power transfer amount according to the power transfer matching group, and obtain a power transfer time according to the power transfer amount, charging current decay coefficient, and constant-voltage initial charging current, wherein the power transfer time includes a capacitor charging time and a capacitor discharging time.

6. The multi-stage power battery charging control method based on intelligent dynamic adjustment according to claim 5, wherein, The step of performing charge transfer on pairwise-matched single cells during the charge transfer time and obtaining the real-time SOC of each single cell after the charge transfer includes: Controlling the opening and closing of the corresponding capacitor conduction switches according to the capacitor charging time and the capacitor discharging time respectively to perform charge transfer; After the charge transfer stops, using the larger value of the capacitor charging time and the capacitor discharging time as the constant voltage charging time; Obtaining the third SOC according to the constant voltage charging time, the second SOC, and the constant voltage initial charging current, and obtaining the real-time SOC according to the third SOC and the charge transfer amount.

7. A multi-stage power battery charging control system based on intelligent dynamic regulation, characterized in that, Including: A first acquisition module, configured to acquire the battery health state values and the initial SOC of multiple single cells, and obtain a pre-charging current according to the battery health state values and the initial SOC to pre-charge the single cells; A second acquisition module, configured to acquire the first SOC of multiple single cells after the battery pre-charging ends, and obtain a constant current charging current according to the first SOC to perform constant current charging on the single cells; A third acquisition module, configured to acquire the second SOC corresponding to the single cells after the battery constant current charging ends, and obtain a constant voltage charging voltage according to the second SOC to perform constant voltage charging on the single cells; A matching module, configured to, after the constant voltage charging of the single cells ends, construct a charge transfer matching group according to the second SOC of each single cell, where the charge transfer matching group includes multiple pairwise-matched single cells, and obtain the charge transfer time according to the charge transfer matching group; A fourth acquisition module, configured to perform charge transfer on pairwise-matched single cells during the charge transfer time and obtain the real-time SOC of each single cell after the charge transfer; A calculation module, configured to obtain a target SOC and calculate the SOC difference value of each single cell according to the real-time SOC and the target SOC; A judgment module, configured to judge whether the SOC difference value is greater than a difference threshold; If all the SOC difference values are not greater than the difference threshold, it is determined that the battery charge is balanced; If there is any one of the SOC difference values greater than the difference threshold, it is determined that the battery charge is unbalanced, and the real-time SOC is returned to the step of obtaining the constant voltage charging voltage according to the second SOC until the battery charge is balanced.

8. A multi-stage power battery charging control system based on intelligent dynamic adjustment according to claim 7, characterized in that, The third acquisition module includes: A first acquisition unit, configured to acquire the constant current charging time, and obtain the second SOC according to the constant current charging current, the constant current charging time, and the first SOC; A judgment unit, configured to judge whether the second SOC is greater than a preset value; If the second SOC is not greater than the preset value, continue with the constant current charging; If the second SOC is greater than the preset value, stop the constant current charging, and acquire the constant current open-circuit voltage of each single cell according to a charge sensor; A second acquisition unit, which acquires the battery characteristic information and the number of charging times of the storage battery, where the battery characteristic information includes a basic charging voltage increment, an influence coefficient, and an aging coefficient; A third acquisition unit, configured to obtain a constant-voltage charging voltage according to the constant-current open-circuit voltage, the second SOC, the charging voltage increment, and the aging coefficient, and perform constant-voltage charging on the single battery according to the constant-voltage charging voltage.

9. A computer device, comprising a memory and a processor, the memory storing a computer program, characterized in that, When the processor executes the computer program, the steps of the method according to any one of claims 1 to 6 are implemented.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 6 are implemented.

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