Soc power prediction method and device for lithium battery hybrid system and computer equipment
By acquiring the usage window limit and state of charge (SOC) information of the lithium battery hybrid system, and using the corrected usage window limit and remaining capacity, the problem of SOC estimation error in the lithium battery hybrid system is solved, and accurate prediction of the SOC capacity of the lithium iron phosphate battery system is achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- DR OCTOPUS INTELLIGENT TECH (SHANGHAI) CO LTD
- Filing Date
- 2022-12-05
- Publication Date
- 2026-07-24
AI Technical Summary
In existing lithium battery hybrid systems, especially ternary and lithium iron phosphate battery systems, there are errors in the estimation of the state of charge (SOC), particularly in the plateau region where it is difficult to accurately obtain the SOC value.
By acquiring the usage window limit of the lithium battery hybrid system, the state of charge information of the first and second battery systems, and using the corrected usage window limit and remaining capacity, the remaining capacity of the second battery system is predicted. This includes methods such as full charge correction, OCV correction, and pre-calibration of experiments to accurately correct the SOC estimation error.
It enables accurate prediction of the SOC (State of Charge) of lithium iron phosphate batteries within the platform region, improving the accuracy of SOC estimation.
Smart Images
Figure CN115754774B_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of power battery management technology, specifically to a method, device, and computer equipment for predicting the SOC (State of Charge) of a lithium battery hybrid system. Background Technology
[0002] With the promotion of new energy vehicles, power lithium-ion batteries have entered a stage of rapid development. In particular, ternary lithium batteries and lithium iron phosphate batteries have become two commonly used power batteries in new energy vehicles. Therefore, the state of charge (SOC) estimation of ternary and lithium iron phosphate battery hybrid systems is an indispensable part of ensuring the stable operation of vehicles.
[0003] However, existing SOC estimation methods for battery hybrid systems have certain errors. For example, the commonly used Kalman filter algorithm is based on the open-circuit voltage and (OCV-SOC) curve of the battery to query the SOC at a specific voltage and temperature. However, since the OCV-SOC of lithium iron phosphate batteries cannot be effectively obtained from the open-circuit voltage when it is in the plateau region, the SOC estimation error in the plateau region is large and it is difficult to reflect the true state of SOC.
[0004] Therefore, the existing SOC estimation methods for battery hybrid systems have low accuracy. Summary of the Invention
[0005] Therefore, it is necessary to provide a method, apparatus, and computer equipment for predicting the SOC of a lithium battery hybrid system to address the aforementioned technical problems and solve the SOC estimation error problem of the lithium iron phosphate system in the battery hybrid system.
[0006] In a first aspect, this application provides a method for predicting the state of charge (SOC) of a lithium battery hybrid system, the lithium battery hybrid system including a first battery system and a second battery system, the method comprising:
[0007] The system obtains the usage window limit of the lithium battery hybrid system, the first state of charge information of the first battery system, the second state of charge information of the second battery system, and the first remaining capacity of the first battery system.
[0008] Based on the first state of charge information and the second state of charge information, the usage window limit is corrected to obtain the corrected usage window limit.
[0009] Based on the revised usage window limit and the first remaining capacity, the second remaining capacity of the second battery system is predicted.
[0010] In some embodiments of this application, the usage window limit includes a first usage window upper limit corresponding to the first battery system and a second usage window upper limit corresponding to the second battery system. The usage window limit is modified based on the first state of charge (SOC) information and the second SOC information to obtain the modified usage window limit. This includes: if the first SOC information is in a first state and the second SOC information is in a second state, then the first usage window upper limit is modified to 100%, and the second usage window upper limit is modified to the maximum remaining charge in the first state; if the first SOC information is in a second state and the second SOC information is in a first state, then the first usage window upper limit is modified to the maximum remaining charge in the first state, and the second usage window upper limit is modified to 100%. The first state represents a state where the battery has been charged to a preset cutoff voltage, and the second state represents a state where the battery has not been charged to the preset cutoff voltage.
[0011] In some embodiments of this application, the first remaining power capacity includes a first minimum remaining power capacity; wherein, the usage window limit is corrected based on the first state of charge information and the second state of charge information to obtain a corrected usage window limit, including: if the second state of charge information is a second state and the second state of charge information satisfies a first preset condition, then the second minimum remaining power capacity of the second system battery, the first maximum available capacity of the first system battery, and the second maximum available capacity of the second system battery are obtained; the first available capacity of the first system battery is obtained based on the product of the first minimum remaining power capacity and the first maximum available capacity; and the second available capacity of the second system battery is obtained based on the product of the second minimum remaining power capacity and the second maximum available capacity; the first available capacity and the second available capacity are compared to correct the usage window limit to obtain a corrected usage window limit.
[0012] In some embodiments of this application, the usage window limit includes a first usage window lower limit corresponding to the first battery system and a second usage window lower limit corresponding to the second battery system. The comparison of the first available capacity and the second available capacity to correct the usage window limit and obtain a corrected usage window limit includes: if the first available capacity is greater than the second available capacity, obtaining a first difference between the first available capacity and the second available capacity, and obtaining a first ratio between the first difference and the first maximum available capacity, to correct the first usage window lower limit to the first ratio and correct the second usage window lower limit to zero percent; if the second available capacity is greater than the first available capacity, obtaining a second difference between the second available capacity and the first available capacity, and obtaining a second ratio between the second difference and the second maximum available capacity, to correct the first usage window lower limit to zero percent and correct the second usage window lower limit to the second ratio.
[0013] In some embodiments of this application, the first remaining power capacity includes a first maximum remaining power capacity; wherein, the usage window limit is corrected based on the first state of charge information and the second state of charge information to obtain a corrected usage window limit, including: if the second state of charge information is a second state and the second state of charge information meets a second preset condition, then the second maximum remaining power capacity of the second system battery, the first maximum usable capacity of the first system battery, and the second maximum usable capacity of the second system battery are obtained; the difference between the first maximum remaining power capacity and 100% of the first power capacity is obtained, and the first rechargeable capacity of the first system battery is obtained based on the product of the first power difference and the first maximum usable capacity; and the second rechargeable capacity of the second system battery is obtained based on the difference between the second maximum remaining power capacity and 100% of the second power capacity, and the second rechargeable capacity of the second system battery is obtained based on the product of the second power difference and the second maximum usable capacity; the first rechargeable capacity and the second rechargeable capacity are compared to correct the usage window limit to obtain a corrected usage window limit.
[0014] In some embodiments of this application, the usage window limit includes a first usage window upper limit corresponding to the first system battery and a second usage window upper limit corresponding to the second system battery; wherein, comparing the first rechargeable capacity and the second rechargeable capacity to correct the usage window limit to obtain a corrected usage window limit includes: if the first rechargeable capacity is greater than the second rechargeable capacity, then obtaining a third difference between the first rechargeable capacity and the second rechargeable capacity, and obtaining a third ratio between the third difference and the first maximum available capacity, so as to correct the first usage window upper limit to the third ratio and correct the second usage window upper limit to 100%; if the second rechargeable capacity is greater than the first rechargeable capacity, then obtaining a fourth difference between the second rechargeable capacity and the first rechargeable capacity, and obtaining a fourth ratio between the fourth difference and the second maximum available capacity, so as to correct the first usage window upper limit to 100% and correct the second usage window upper limit to the fourth ratio.
[0015] In some embodiments of this application, the first remaining power capacity includes a first maximum remaining power capacity and a first minimum remaining power capacity; wherein, predicting the second remaining power capacity of the second battery system based on the modified usage window limit and the first remaining power capacity includes: obtaining the first maximum available capacity of the first battery system and the second maximum available capacity of the second battery system; predicting the second maximum remaining power capacity and the second minimum remaining power capacity of the second battery system based on the first maximum available capacity, the second maximum available capacity, the first maximum remaining power capacity, the first minimum remaining power capacity, and the modified usage window limit; and determining the second maximum remaining power capacity and the second minimum remaining power capacity as the second remaining power capacity.
[0016] Secondly, this application provides a SOC (State of Charge) prediction device for a lithium battery hybrid system, the lithium battery hybrid system including a first battery system and a second battery system, the device comprising:
[0017] The information acquisition module is used to acquire the usage window limit of the lithium battery hybrid system, the first state of charge information of the first system battery, and the second state of charge information of the second system battery.
[0018] The numerical correction module is used to correct the usage window limit based on the first state of charge information and the second state of charge information to obtain the corrected usage window limit.
[0019] The power prediction module is used to obtain the first remaining power of the first battery system, and to predict the second remaining power of the second battery system based on the first remaining power and the corrected usage window limit.
[0020] Thirdly, this application also provides a computer device, comprising:
[0021] One or more processors;
[0022] The memory; and one or more application programs, wherein the one or more application programs are stored in the memory and configured to be executed by the processor to implement the SOC power prediction method of the above-described lithium battery hybrid system.
[0023] Fourthly, this application also provides a computer-readable storage medium having a computer program stored thereon, the computer program being loaded by a processor to execute the steps in the above-described SOC power prediction method for a lithium battery hybrid system.
[0024] Fifthly, embodiments of this application provide a computer program product or computer program that includes computer instructions stored in a computer-readable storage medium. A processor of a computer device reads the computer instructions from the computer-readable storage medium and executes the computer instructions, causing the computer device to perform the method provided in the first aspect described above.
[0025] The aforementioned method, apparatus, and computer equipment for predicting the SOC of a lithium-ion battery hybrid system mainly obtain the usage window limit of the lithium-ion battery hybrid system, the first state of charge information of the first battery system, the second state of charge information of the second battery system, and the first remaining capacity of the first battery system. Based on the first and second state of charge information, the usage window limit is corrected to obtain the corrected usage window limit. Then, based on the corrected usage window limit and the first remaining capacity, the second remaining capacity of the second battery system is predicted. This solves the SOC estimation error problem of the lithium iron phosphate system in the lithium-ion battery hybrid system, thereby accurately predicting the SOC of the lithium iron phosphate system battery in the plateau region. Attached Figure Description
[0026] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0027] Figure 1 This is an application scenario diagram of the SOC power prediction method provided in the embodiments of this application;
[0028] Figure 2 This is a flowchart illustrating the SOC power prediction method provided in the embodiments of this application;
[0029] Figure 3 This is a schematic diagram of the status interface of the lithium battery hybrid system provided in the embodiments of this application;
[0030] Figure 4 This is a schematic diagram of the SOC power prediction device provided in the embodiments of this application;
[0031] Figure 5 This is a schematic diagram of the structure of the computer device in the embodiments of this application. Detailed Implementation
[0032] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.
[0033] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.
[0034] In the description of this application, the term "for example" is used to mean "used as an example, illustration, or description." Any embodiment described as "for example" in this application is not necessarily to be construed as being more preferred or advantageous than other embodiments. The following description is provided to enable any person skilled in the art to make and use the invention. Details are set forth in the following description for purposes of explanation. It should be understood that those skilled in the art will recognize that the invention can be made without using these specific details. In other instances, well-known structures and processes will not be described in detail to avoid obscuring the description of the invention with unnecessary detail. Therefore, the invention is not intended to be limited to the embodiments shown, but is consistent with the broadest scope of the principles and features disclosed in this application.
[0035] In this application embodiment, the SOC power prediction method provided can be applied to, for example, Figure 1 The lithium battery hybrid system shown includes not only a first-cell battery and a second-cell battery, but also a terminal 102 and a server 104. Terminal 102 can be a device that includes both receiving and transmitting hardware, i.e., a device with receiving and transmitting hardware capable of performing bidirectional communication over a bidirectional communication link. Such a device can include cellular or other communication devices with single-line or multi-line displays. Terminal 102 can specifically be a desktop terminal or a mobile terminal; it can also be a mobile phone, tablet computer, or laptop computer. Server 104 can be a standalone server, or a server network or server cluster, including but not limited to computers, network hosts, single network servers, edge servers, multiple network server sets, or cloud servers composed of multiple servers. The cloud server consists of a large number of computers or network servers based on cloud computing.
[0036] Those skilled in the art will understand that Figure 1 The application environment shown is merely one applicable scenario for the solution in this application and does not constitute a limitation on the application scenario of the solution in this application. Other application environments may include more than one. Figure 1 The number of devices shown may be more or less. For example, Figure 1Only one server is shown. It is understood that this lithium-ion battery hybrid system may also include one or more other devices, which are not specifically limited here. Additionally, the lithium-ion battery hybrid system may also include a memory for storing data, such as OCV (Open Circuit Voltage)-SOC (Open Circuit Voltage) curve data.
[0037] It should be noted that, Figure 1 The schematic diagram of the lithium battery hybrid system shown is merely an example. The lithium battery hybrid system and scenario described in the embodiments of the present invention are for the purpose of more clearly illustrating the technical solutions of the embodiments of the present invention, and do not constitute a limitation on the technical solutions provided by the embodiments of the present invention. As those skilled in the art will know, with the evolution of lithium battery hybrid systems and the emergence of new business scenarios, the technical solutions provided by the embodiments of the present invention are also applicable to similar technical problems.
[0038] See Figure 2 This application provides a method for predicting the state of charge (SOC) of a lithium battery hybrid system. The lithium battery hybrid system includes a first battery system and a second battery system. This embodiment mainly applies this method to the above-mentioned system. Figure 1 Taking server 104 as an example, the method includes steps S201 to S203, as follows:
[0039] S201, obtain the usage window limit of the lithium battery hybrid system, the first state of charge information of the first system battery, the second state of charge information of the second system battery, and the first remaining capacity of the first system battery.
[0040] Among them, the first system battery can refer to the ternary lithium battery system, and the second system battery can refer to the lithium battery system of iron phosphate.
[0041] The usage window limit can include an upper limit and a lower limit. The upper limit refers to the state of the hybrid system when any cell in the lithium battery hybrid system reaches the upper limit charging condition. This state can be represented by the maximum SOC state of lithium iron phosphate and ternary lithium batteries. Here, the maximum SOC of ternary lithium batteries when the upper limit of the window is reached is defined as "SOC". NMX_H The maximum SOC of lithium iron phosphate when the upper limit of the window is reached is "SOC". LFP_H The lower limit of the discharge window refers to the state of the hybrid lithium battery system when any cell reaches the discharge lower limit cutoff condition. This state can be represented by the minimum SOC state of lithium iron phosphate and ternary lithium batteries. Here, the minimum SOC of ternary lithium batteries when the lower limit of the discharge window is reached is defined as "SOC". NMX_L The minimum SOC of lithium iron phosphate when the lower limit of the window is reached is "SOC". LFP_L ".
[0042] The first state of charge (SOC) information refers to the state of charge of the first battery system at the predicted SOC, typically expressed as a percentage, such as "100%" or "95%". The second state of charge (SOC) information, similar to the first, refers to the state of charge of the second battery system at the predicted SOC, also expressed as "100%" or "95%".
[0043] The first remaining power includes the first maximum remaining power and the first minimum remaining power, which can be analyzed and output by a preset filtering algorithm.
[0044] In practice, the first maximum and first minimum remaining battery capacity can be accurately calculated using various filtering algorithms based on the equivalent circuit model (such as extended Kalman filter, capacitive Kalman filter, etc.). Specifically, by selecting the Thevenin equivalent circuit model, and based on circuit-related knowledge, the expression between the battery terminal voltage "Ut" and the model parameters can be obtained:
[0045]
[0046] In the formula, "U p "I" represents the voltage across the RC circuit. t "This sets the battery output current, with discharge being positive and charging being negative." This represents the voltage across the capacitor portion of the corresponding equivalent circuit model; "C" P "R" represents the capacitance of the capacitor portion in the corresponding equivalent circuit model. P "U" indicates the battery's polarization voltage; OC "R0" represents the voltage of the corresponding battery SOC and OCV; "R0" represents the ohmic internal resistance of the corresponding equivalent circuit model.
[0047] Assuming the current remains constant within one sampling period, discretizing the system yields the expression for the polarization voltage:
[0048] U p，k =e (-Δt / τ) U p，k-1 -R p I t，k-1 (1-e (-Δt / τ) (2)
[0049] Among them, “U” P，K “k” represents the polarization voltage of the battery at time “k”; “Δt” is the sampling interval of the system; “τ” is the time constant of the RC element in the Thevenin model; “I ... t，k-1 "" represents the battery output current at time "k-1", where the discharge current is positive and the charging current is negative.
[0050] Therefore, the discretization equation of SOC is obtained by the ampere-hour integration method, and the expression is:
[0051] z k =z k-1 -I t，k-1 Δt / C n (3)
[0052] Among them, “Z” k “C” represents the SOC value at time “k”; n "This represents the actual capacity of the battery under current conditions. In the Kalman filter for estimating the SOC, the battery's polarization voltage "U" is used." p "and SOC value as system state value, i.e. x k =[U p，k z k ] T The system's state equation is expressed using the terminal voltage equation, and the observed quantity is the battery terminal voltage, i.e., y. k =U t，k Therefore, the system's state equation and observation equation are:
[0053]
[0054] Among them, “w 1，k-1 "This is the white noise in the Kalman filter algorithm;" 1，k "x" represents the acquisition error in the Kalman filter algorithm. This is obtained from the Kalman filter algorithm used for SOC estimation. k coefficient of and for:
[0055]
[0056] The Kalman filter method calculates the state value and error covariance at time "k=0" as follows:
[0057] Initial conditions:
[0058] State prediction:
[0059] Error covariance prediction:
[0060] Kalman filter gain:
[0061] Status correction:
[0062] Error covariance update: P k|k =(IKk H k )P k|k-1 (11)
[0063] Among them, “x” k " is the system's state vector at time "k" (i.e., the first remaining charge), "y" k " is the observation vector of the system at time "k", and the coefficient "B" is... k " is the state transition matrix, and the coefficients "B k "H" is the input control matrix for the state equation, with coefficients "H" k "Q" represents the observation matrix, and the covariance matrices corresponding to the system noise and observation noise are respectively "Q". k "and "R k " This represents the predicted value of the state at time "k" (also known as the prior estimate); Represents the estimated state value at time "k-1", and represents the corrected state estimate; "K" represents the estimated state value. k "P" represents the Kalman filter gain. k|k-1 "for The error covariance, "P" k|k "for The prediction error covariance.
[0064] S202, based on the first state of charge information and the second state of charge information, the usage window limit is corrected to obtain the corrected usage window limit.
[0065] In specific implementations, the window limit correction methods proposed in this application include: full charge correction, OCV correction, and pre-calibration of experiments. Among these, the full charge correction method and the OCV correction method need to be selected based on the first state of charge information and the second state of charge information in practical application scenarios. The following will explain in detail how to correct the usage window limit based on the first state of charge information and the second state of charge information to obtain a usage window limit that can be used as the basis for subsequent SOC power prediction analysis.
[0066] In one embodiment, the usage window limit includes a first usage window upper limit value corresponding to the first battery system and a second usage window upper limit value corresponding to the second battery system. Step S202 includes: if the first state of charge information is a first state and the second state of charge information is a second state, then the first usage window upper limit value is corrected to 100%, and the second usage window upper limit value is corrected to the maximum remaining charge in the first state; if the first state of charge information is a second state and the second state of charge information is a first state, then the first usage window upper limit value is corrected to the maximum remaining charge in the first state, and the second usage window upper limit value is corrected to 100%; wherein, the first state represents a state that has been charged to a preset cutoff voltage, and the second state represents a state that has not been charged to a preset cutoff voltage.
[0067] Among them, the upper limit of the first usage window corresponding to the first system battery can be expressed as "SOC". NMX_H The upper limit of the second usage window corresponding to the second system battery can be expressed as "SOC". LFP_H ".
[0068] In practical implementation, a typical battery hybrid system includes 120 cells, of which 98 are lithium iron phosphate (LFP) cells and 22 are ternary lithium-ion (LiFePO4) cells. However, this application does not limit the actual number; this is just an example. The hybrid system state refers to the overlap in the SOC (State of Charge) usage range between the ternary and LFP systems, and can be divided into four states, such as... Figure 3 As shown, the types include: ternary lithium-ion batteries, ternary lithium-ion batteries with cross-linked lithium-ion batteries (ternary batteries fully charged first), ternary lithium-ion batteries with cross-linked lithium-ion batteries (lithium-ion batteries fully charged first), and lithium-ion batteries containing ternary lithium-ion batteries. For hybrid battery systems, since the aging and degradation rate of ternary systems is generally faster than that of lithium-ion systems, the initial rated capacity of ternary systems will be higher than that of lithium-ion systems. Initially, it will be in a ternary lithium-ion battery containing lithium-ion battery state. However, as the battery ages or self-discharges, it may transform into one of the other three states.
[0069] Furthermore, when server 104 detects that any cell in the battery hybrid system has reached the upper limit of the charging cutoff voltage, it determines that the cell is fully charged. If the ternary lithium battery cell is fully charged first, that is, if the first state of charge information is in the first state and the second state of charge information is in the second state, then the first usage window upper limit value "SOC" of the ternary lithium battery cell is corrected. NMX_H The value was changed to "100%", and the upper limit of the second usage window for lithium iron phosphate cells, "SOC", was revised. LFP_H "This is the maximum SOC of lithium iron phosphate batteries when fully charged."
[0070] Furthermore, if the lithium iron phosphate cell is fully charged first, that is, if the first state of charge information is in the second state and the second state of charge information is in the first state, then the upper limit of the first usage window "SOC" of the ternary lithium cell is adjusted. NMX_H"The maximum SOC of ternary lithium batteries at full charge, and the upper limit of the second usage window for lithium iron phosphate cells is adjusted." LFP_H "100%" is used. This embodiment illustrates the full charge correction method described above.
[0071] In one embodiment, the first remaining power includes a first minimum remaining power. Step S202 includes: if the second state of charge information is a second state and the second state of charge information meets a first preset condition, then obtain the second minimum remaining power of the second system battery, the first maximum available capacity of the first system battery, and the second maximum available capacity of the second system battery; obtain the first available capacity of the first system battery based on the product of the first minimum remaining power and the first maximum available capacity; and obtain the second available capacity of the second system battery based on the product of the second minimum remaining power and the second maximum available capacity; compare the first available capacity and the second available capacity to correct the usage window limit and obtain the corrected usage window limit.
[0072] The first preset condition can be that the second state of charge information is in the non-platform region of the initial stage (below "30%", but not limited to the value of "30%). For example, if the current SOC of the second system battery is "25%" and "25% < 30%", it means that its second state of charge information meets the first preset condition.
[0073] In specific implementation, considering the SOC estimation error of the lithium iron phosphate (LFP) system (when the SOC of ternary lithium is in the "0%-100%" range, the corresponding OCV has no plateau region; as long as it is left to stand for a period of time, the SOC can be corrected using OCV, so there is no need to consider the SOC estimation error of ternary lithium), window limit correction is only used when the true SOC value of the LFP system can be obtained. The OCV correction refers to a sleep time that meets a certain threshold (e.g., ternary lithium is left to stand for 1 hour, LFP for 3 hours), and at this time, the OCV voltage of LFP is not in the plateau region (when the SOC of LFP is less than "30%" or greater than "95%", it indicates that the OCV voltage of LFP is not in the plateau region, and a relatively accurate LFP SOC value can be obtained from the OCV-SOC curve; however, when the SOC of LFP is in the "30% to 95%" range (excluding 30% and 95%), it indicates that the OCV voltage of LFP is in the plateau region, and an accurate LFP SOC value cannot be obtained from the OCV-SOC curve). Therefore, for lithium iron phosphate (LiFePO4) systems, it is necessary to use non-platform region data to correct platform region data in order to obtain accurate SOC (State of Charge) capacity. OCV correction can be divided into: correction for non-platform regions below 30% and correction for non-platform regions above 95%. This embodiment will focus on explaining the first correction method.
[0074] Specifically, when server 104 detects that the second state of charge information is in the second state (not fully charged), and the second state of charge information meets the first preset condition (such as the SOC of lithium iron phosphate being less than or equal to "30%), the lower limit of the usage window can be corrected based on the accurate minimum SOC of lithium iron phosphate (second minimum remaining capacity) and minimum SOC of ternary lithium phosphate (first minimum remaining capacity): the available capacity of the two systems is calculated based on the minimum SOC, the first available capacity = first minimum remaining capacity * first maximum available capacity, the second available capacity = second minimum remaining capacity * second maximum available capacity, and the current available capacity of lithium iron phosphate is compared with the available capacity of ternary lithium phosphate, that is, the size of the first available capacity and the second available capacity is analyzed, and it can be determined how to correct the usage window limit, which will be explained in detail below.
[0075] In one embodiment, the usage window limit includes a first usage window lower limit corresponding to the first battery system and a second usage window lower limit corresponding to the second battery system. The usage window limit is corrected by comparing the first available capacity and the second available capacity to obtain a corrected usage window limit. This includes: if the first available capacity is greater than the second available capacity, obtaining a first difference between the first and second available capacities, and obtaining a first ratio between the first difference and the first maximum available capacity, to correct the first usage window lower limit to the first ratio and correct the second usage window lower limit to zero; if the second available capacity is greater than the first available capacity, obtaining a second difference between the second and first available capacities, and obtaining a second ratio between the second difference and the second maximum available capacity, to correct the first usage window lower limit to zero and correct the second usage window lower limit to the second ratio.
[0076] In specific implementation, when the first available capacity of the ternary lithium battery is greater than the second available capacity of the lithium iron phosphate battery, it indicates that the lithium iron phosphate battery is fully discharged first, and the lower limit of the first usage window "SOC" is set. NMx_L "The revised ratio is: First Ratio = (First Available Capacity - Second Available Capacity) / First Maximum Available Capacity, and the second usage window lower limit 'SOC' is set." LFP_L "Corrected to "0%"; When the second available capacity of lithium iron phosphate is greater than the first available capacity of ternary lithium, it indicates that the ternary lithium is fully discharged first, so the lower limit of the first usage window "SOC" is set. NMX_L "Modified to "0%", and the second usage window lower limit value "SOC" was changed. LFP_L "The revised ratio is the second ratio, which is equal to (second available capacity - first available capacity) / second maximum available capacity."
[0077] In one embodiment, the first remaining power capacity includes the first maximum remaining power capacity. Step S202 includes: if the second state of charge information is in the second state and the second state of charge information meets the second preset condition, then obtain the second maximum remaining power capacity of the second system battery, the first maximum available capacity of the first system battery, and the second maximum available capacity of the second system battery; obtain the difference between the first maximum remaining power capacity and 100% of the first power capacity, and obtain the first rechargeable capacity of the first system battery based on the product of the first power difference and the first maximum available capacity; and obtain the second rechargeable capacity of the second system battery based on the difference between the second maximum remaining power capacity and 100% of the second power capacity, and obtain the second rechargeable capacity of the second system battery based on the product of the second power difference and the second maximum available capacity; compare the first rechargeable capacity and the second rechargeable capacity to correct the usage window limit and obtain the corrected usage window limit.
[0078] In this specific implementation, this embodiment will focus on explaining the second correction method for OCV correction. Specifically, when the server 104 detects that the second state of charge information is in the second state (not fully charged state), and the second state of charge information meets the second preset condition (such as the SOC of lithium iron phosphate being greater than or equal to "95%)", the upper limit of the usage window can be corrected based on the accurate maximum SOC of lithium iron phosphate (second maximum remaining capacity) and the maximum SOC of ternary lithium (first maximum remaining capacity): the rechargeable capacity of the two systems is calculated based on the maximum SOC, the first rechargeable capacity = (1 - first maximum remaining capacity) * first maximum usable capacity, and the second rechargeable capacity = (1 - second maximum remaining capacity) * first maximum usable capacity; by comparing the current rechargeable capacity of lithium iron phosphate and the rechargeable capacity of ternary lithium, that is, by analyzing the size of the first rechargeable capacity and the second rechargeable capacity, it is possible to determine how to correct the usage window limit, which will be explained in detail below.
[0079] In one embodiment, the usage window limit includes a first usage window upper limit corresponding to the first system battery and a second usage window upper limit corresponding to the second system battery. The usage window limit is corrected by comparing the first rechargeable capacity and the second rechargeable capacity to obtain a corrected usage window limit. This includes: if the first rechargeable capacity is greater than the second rechargeable capacity, obtaining a third difference between the first and second rechargeable capacities, and obtaining a third ratio between the third difference and the first maximum available capacity, so as to correct the first usage window upper limit to the third ratio and correct the second usage window upper limit to 100%; if the second rechargeable capacity is greater than the first rechargeable capacity, obtaining a fourth difference between the second and first rechargeable capacities, and obtaining a fourth ratio between the fourth difference and the second maximum available capacity, so as to correct the first usage window upper limit to 100% and correct the second usage window upper limit to the fourth ratio.
[0080] In specific implementation, when the first rechargeable capacity of the ternary lithium battery is greater than the second rechargeable capacity of the lithium iron phosphate battery, it indicates that the lithium iron phosphate battery is fully charged first, and the upper limit of the first usage window "SOC" is set. NMX_H "The revised ratio is the third ratio, which is calculated as (first rechargeable capacity - second rechargeable capacity) / first maximum available capacity, and the second usage window upper limit value is set to "SOC". LFP_H "Corrected to "100%"; When the second rechargeable capacity of lithium iron phosphate is greater than the first rechargeable capacity of ternary lithium, it means that the ternary lithium is fully charged first, and the upper limit of the first usage window "SOC" will be set. NMX_H "Revised to "100%", and the second window upper limit value "SOC" was changed. LFP_H "The revised ratio is the fourth ratio, which is equal to (second rechargeable capacity - first rechargeable capacity) / second maximum available capacity."
[0081] S203, based on the revised usage window limit and the first remaining charge, predicts the second remaining charge of the second system battery.
[0082] The first remaining power has been described in detail above, including the first maximum remaining power (maximum SOC of ternary lithium) and the first minimum remaining power (minimum SOC of ternary lithium). Similarly, the second remaining power includes the second maximum remaining power (maximum SOC of lithium iron phosphate) and the second minimum remaining power (minimum SOC of lithium iron phosphate).
[0083] In specific implementation, server 104 modifies the upper and lower limits of the usage window based on the scheme described in the above embodiment. After obtaining the modified usage window limits, the second maximum remaining power can be obtained by analyzing the modified upper limit of the usage window and the first maximum remaining power. At the same time, the second minimum remaining power can be obtained by analyzing the modified lower limit of the usage window and the first minimum remaining power. The specific analysis process will be described in detail below.
[0084] In one embodiment, the first remaining power includes a first maximum remaining power and a first minimum remaining power. Step S203 includes: obtaining the first maximum available capacity of the first battery system and the second maximum available capacity of the second battery system; predicting the second maximum remaining power and the second minimum remaining power of the second battery system based on the first maximum available capacity, the second maximum available capacity, the first maximum remaining power, the first minimum remaining power and the corrected usage window limit; and determining the second maximum remaining power and the second minimum remaining power as the second remaining power.
[0085] In practice, the second maximum remaining capacity (maximum SOC of lithium iron phosphate) = SOC LFP_H -(SOC NMX_H - (First maximum remaining power) * First maximum available capacity / Second maximum available capacity; where, "(SOC)"NMX_H "-First maximum remaining power)" indicates the ternary lithium battery's rechargeable SOC, "(SOC)" NMX_H "(First Maximum Remaining Capacity) * First Maximum Available Capacity" represents the total chargeable capacity from SOC to full. NMX_H "(First maximum remaining capacity) * First maximum usable capacity / Second maximum usable capacity" represents the state of charge (SOC) of a lithium iron phosphate battery when fully charged. Further, the second minimum remaining capacity (minimum SOC of lithium iron phosphate) = SOC LFP_L +(First minimum remaining power - SOC) NMX_L *First maximum available capacity / Second maximum available capacity.
[0086] The SOC (State of Charge) prediction method for the lithium-ion battery hybrid system in the above embodiments mainly obtains the usage window limit of the lithium-ion battery hybrid system, the first state of charge information of the first battery system, the second state of charge information of the second battery system, and the first remaining capacity of the first battery system. Based on the first and second state of charge information, the usage window limit is corrected to obtain the corrected usage window limit. Then, based on the corrected usage window limit and the first remaining capacity, the second remaining capacity of the second battery system is predicted. This solves the SOC estimation error problem of the lithium iron phosphate (LFP) system in the lithium-ion battery hybrid system, thereby accurately predicting the SOC of the LFP system battery in the plateau region.
[0087] It should be understood that, although Figure 2 The steps in the flowchart are shown sequentially as indicated by the arrows, but these steps are not necessarily executed in the order indicated by the arrows. Unless otherwise specified herein, there is no strict order in which these steps are executed, and they can be performed in other orders. Figure 2 At least some of the steps in the process may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these sub-steps or stages is not necessarily sequential, but can be executed in turn or alternately with other steps or at least some of the sub-steps or stages of other steps.
[0088] To better implement the SOC (State of Charge) prediction method for lithium battery hybrid systems provided in this application, this application also provides an SOC prediction device for lithium battery hybrid systems, based on the method proposed in this application. The lithium battery hybrid system includes a first battery system and a second battery system, such as... Figure 4 As shown, the SOC power prediction device 400 of the lithium battery hybrid system includes:
[0089] The information acquisition module 410 is used to acquire the usage window limit of the lithium battery hybrid system, the first state of charge information of the first system battery, and the second state of charge information of the second system battery.
[0090] The numerical correction module 420 is used to correct the usage window limit based on the first state of charge information and the second state of charge information to obtain the corrected usage window limit.
[0091] The power prediction module 430 is used to obtain the first remaining power of the first system battery, and to predict the second remaining power of the second system battery based on the first remaining power and the corrected usage window limit.
[0092] In one embodiment, the usage window limit includes a first usage window upper limit value corresponding to the first battery system and a second usage window upper limit value corresponding to the second battery system. The value correction module 420 is further configured to, if the first state of charge information is in the first state and the second state of charge information is in the second state, correct the first usage window upper limit value to 100% and correct the second usage window upper limit value to the maximum remaining charge in the first state; if the first state of charge information is in the second state and the second state of charge information is in the first state, correct the first usage window upper limit value to the maximum remaining charge in the first state and correct the second usage window upper limit value to 100%. Herein, the first state represents the state that has been charged to the preset cutoff voltage, and the second state represents the state that has not been charged to the preset cutoff voltage.
[0093] In one embodiment, the first remaining power includes a first minimum remaining power. The value correction module 420 is further configured to: if the second state of charge information is in the second state and the second state of charge information satisfies the first preset condition, then obtain the second minimum remaining power of the second system battery, the first maximum available capacity of the first system battery, and the second maximum available capacity of the second system battery; obtain the first available capacity of the first system battery based on the product of the first minimum remaining power and the first maximum available capacity; and obtain the second available capacity of the second system battery based on the product of the second minimum remaining power and the second maximum available capacity; compare the first available capacity and the second available capacity to correct the usage window limit and obtain the corrected usage window limit.
[0094] In one embodiment, the usage window limit includes a first usage window lower limit corresponding to the first system battery and a second usage window lower limit corresponding to the second system battery. The value correction module 420 is further configured to, if the first available capacity is greater than the second available capacity, obtain a first difference between the first available capacity and the second available capacity, and obtain a first ratio between the first difference and the first maximum available capacity, so as to correct the first usage window lower limit to the first ratio and correct the second usage window lower limit to zero percent; if the second available capacity is greater than the first available capacity, obtain a second difference between the second available capacity and the first available capacity, and obtain a second ratio between the second difference and the second maximum available capacity, so as to correct the first usage window lower limit to zero percent and correct the second usage window lower limit to the second ratio.
[0095] In one embodiment, the first remaining power includes a first maximum remaining power. The numerical correction module 420 is further configured to: if the second state of charge information is in a second state and the second state of charge information meets a second preset condition, then obtain the second maximum remaining power of the second system battery, the first maximum available capacity of the first system battery, and the second maximum available capacity of the second system battery; obtain the difference between the first maximum remaining power and 100% of the first power, and obtain the first rechargeable capacity of the first system battery based on the product of the first power difference and the first maximum available capacity; and obtain the second rechargeable capacity of the second system battery based on the difference between the second maximum remaining power and 100% of the second power, and obtain the second rechargeable capacity of the second system battery based on the product of the second power difference and the second maximum available capacity; compare the first rechargeable capacity and the second rechargeable capacity to correct the usage window limit and obtain the corrected usage window limit.
[0096] In one embodiment, the usage window limit includes a first usage window upper limit value corresponding to the first system battery and a second usage window upper limit value corresponding to the second system battery. The value correction module 420 is further configured to, if the first rechargeable capacity is greater than the second rechargeable capacity, obtain a third difference between the first rechargeable capacity and the second rechargeable capacity, and obtain a third ratio between the third difference and the first maximum available capacity, so as to correct the first usage window upper limit value to the third ratio and correct the second usage window upper limit value to 100%; if the second rechargeable capacity is greater than the first rechargeable capacity, obtain a fourth difference between the second rechargeable capacity and the first rechargeable capacity, and obtain a fourth ratio between the fourth difference and the second maximum available capacity, so as to correct the first usage window upper limit value to 100% and correct the second usage window upper limit value to the fourth ratio.
[0097] In one embodiment, the first remaining power includes a first maximum remaining power and a first minimum remaining power. The power prediction module 430 is further configured to obtain the first maximum available capacity of the first battery system and the second maximum available capacity of the second battery system; predict the second maximum remaining power and the second minimum remaining power of the second battery system based on the first maximum available capacity, the second maximum available capacity, the first maximum remaining power, the first minimum remaining power and the corrected usage window limit; and determine the second maximum remaining power and the second minimum remaining power as the second remaining power.
[0098] In the above embodiments, the usage window limit of the lithium battery hybrid system, the first state of charge information of the first system battery, the second state of charge information of the second system battery, and the first remaining capacity of the first system battery are mainly obtained. Based on the first and second state of charge information, the usage window limit is corrected to obtain the corrected usage window limit. Then, based on the corrected usage window limit and the first remaining capacity, the second remaining capacity of the second system battery is predicted. This solves the SOC estimation error problem of the lithium iron phosphate system in the lithium battery hybrid system, thereby accurately predicting the SOC capacity of the lithium iron phosphate system battery in the plateau region.
[0099] It should be noted that the specific limitations of the SOC power prediction device for lithium battery hybrid systems can be found in the limitations of the SOC power prediction method for lithium battery hybrid systems mentioned above, and will not be repeated here. Each module in the aforementioned SOC power prediction device for lithium battery hybrid systems can be implemented entirely or partially through software, hardware, or a combination thereof. These modules can be embedded in the processor of the electronic device in hardware form or independently of the processor, or they can be stored in the memory of the electronic device in software form, so that the processor can call and execute the corresponding operations of each module.
[0100] In some embodiments of this application, the SOC power prediction device 400 of the lithium battery hybrid system can be implemented as a computer program, which can be implemented in, for example... Figure 5 The computer device shown operates on this system. The computer device's memory can store the various program modules that make up the SOC power prediction device 400 of the lithium battery hybrid system, for example... Figure 4 The information acquisition module 410, numerical correction module 420, and power prediction module 430 shown; the computer program composed of each program module causes the processor to execute the steps in the SOC power prediction method of the lithium battery hybrid system of the various embodiments of this application described in this specification. For example, Figure 5 The computer equipment shown can be used as follows Figure 4The information acquisition module 410 of the SOC power prediction device 400 in the lithium battery hybrid system shown executes step S201. The computer device can execute step S202 via the numerical correction module 420. The computer device can execute step S203 via the power prediction module 430. The computer device includes a processor, memory, and network interface connected via a system bus. The processor provides computing and control capabilities. The memory includes a non-volatile storage medium and internal memory. The non-volatile storage medium stores the operating system and computer programs. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage medium. The network interface of the computer device is used for communication with external computer devices via a network connection. When the computer program is executed by the processor, it implements a method for predicting the SOC power of a lithium battery hybrid system.
[0101] As will be understood by those skilled in the art, Figure 5 The structure shown is merely a block diagram of a portion of the structure related to the present application and does not constitute a limitation on the computer device to which the present application is applied. Specific computer devices may include more or fewer components than those shown in the figure, or combine certain components, or have different component arrangements.
[0102] In some embodiments of this application, a computer device is provided, including one or more processors; a memory; and one or more application programs, wherein the one or more application programs are stored in the memory and configured to be executed by the processor as steps of the SOC power prediction method for the lithium-ion battery hybrid system described above. The steps of this SOC power prediction method for the lithium-ion battery hybrid system can be the steps in the SOC power prediction methods for the lithium-ion battery hybrid systems described in the various embodiments above.
[0103] In some embodiments of this application, a computer-readable storage medium is provided, storing a computer program. The computer program is loaded by a processor, causing the processor to execute the steps of the SOC power prediction method for the lithium-ion battery hybrid system described above. The steps of the SOC power prediction method for the lithium-ion battery hybrid system described here can be the steps in the SOC power prediction methods for the lithium-ion battery hybrid systems described in the various embodiments above.
[0104] Those skilled in the art will understand that all or part of the processes in the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium, and when executed, it can include the processes of the embodiments of the above methods. Any references to memory, storage, databases, or other media used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, or optical storage, etc. Volatile memory can include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM), etc.
[0105] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0106] The above provides a detailed description of a SOC power prediction method, apparatus, and computer device for a lithium battery hybrid system provided in the embodiments of this application. Specific examples have been used to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of the present invention. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.
Claims
1. A method for predicting the state of charge (SOC) of a lithium battery hybrid system, characterized in that, The lithium battery hybrid system includes a first battery system and a second battery system, and the method includes: The system obtains the usage window limit of the lithium battery hybrid system, the first state of charge information of the first system battery, the second state of charge information of the second system battery, and the first remaining capacity of the first system battery. Based on the first state of charge information and the second state of charge information, the usage window limit is corrected to obtain the corrected usage window limit; Based on the revised usage window limit and the first remaining charge, the second remaining charge of the second system battery is predicted. The usage window limit includes a first usage window upper limit value corresponding to the first system battery, a second usage window upper limit value corresponding to the second system battery, a first usage window lower limit value corresponding to the first system battery, and a second usage window lower limit value corresponding to the second system battery. The first remaining power includes a first maximum remaining power and a first minimum remaining power, and the second remaining power includes a second maximum remaining power and a second minimum remaining power; The prediction of the second remaining capacity of the second system battery includes: obtaining the first maximum available capacity of the first system battery and the second maximum available capacity of the second system battery; The second maximum remaining power is determined based on the modified second usage window upper limit, the difference between the modified first usage window upper limit and the first maximum remaining power, and the ratio between the first maximum available capacity and the second maximum available capacity. The second minimum remaining power is determined based on the modified second usage window lower limit, the difference between the first minimum remaining power and the modified first usage window lower limit, and the ratio between the first maximum available capacity and the second maximum available capacity.
2. The method as described in claim 1, characterized in that, The usage window limit includes a first usage window upper limit value corresponding to the first system battery and a second usage window upper limit value corresponding to the second system battery; The step of correcting the usage window limit based on the first state of charge information and the second state of charge information to obtain the corrected usage window limit includes: If the first state of charge information is in the first state and the second state of charge information is in the second state, then the upper limit of the first usage window is corrected to 100%, and the upper limit of the second usage window is corrected to the maximum remaining power in the first state. If the first state of charge information is in the second state and the second state of charge information is in the first state, then the upper limit of the first usage window is corrected to the maximum remaining power in the first state, and the upper limit of the second usage window is corrected to 100%. The first state indicates that the battery has been charged to the preset cutoff voltage, and the second state indicates that the battery has not been charged to the preset cutoff voltage.
3. The method as described in claim 1 or 2, characterized in that, The first remaining power includes the first minimum remaining power; The step of correcting the usage window limit based on the first state of charge information and the second state of charge information to obtain the corrected usage window limit includes: If the second state of charge information is in the second state and the second state of charge information meets the first preset condition, then obtain the second minimum remaining capacity of the second system battery, the first maximum available capacity of the first system battery, and the second maximum available capacity of the second system battery. The first usable capacity of the first battery system is obtained by multiplying the first minimum remaining charge by the first maximum usable capacity; and The second available capacity of the second battery system is obtained by multiplying the second minimum remaining charge by the second maximum available capacity. The first available capacity and the second available capacity are compared to adjust the usage window limit, resulting in a adjusted usage window limit.
4. The method as described in claim 3, characterized in that, The usage window limit includes a first usage window lower limit corresponding to the first system battery and a second usage window lower limit corresponding to the second system battery; The step of comparing the first available capacity and the second available capacity to correct the usage window limit and obtain the corrected usage window limit includes: If the first available capacity is greater than the second available capacity, then obtain the first difference between the first available capacity and the second available capacity, and obtain the first ratio between the first difference and the first maximum available capacity, so as to correct the first usage window lower limit to the first ratio and correct the second usage window lower limit to zero percent; If the second available capacity is greater than the first available capacity, then obtain the second difference between the second available capacity and the first available capacity, and obtain the second ratio between the second difference and the second maximum available capacity, so as to correct the first usage window lower limit to zero percent and correct the second usage window lower limit to the second ratio.
5. The method as described in claim 1 or 2, characterized in that, The first remaining power capacity includes the first maximum remaining power capacity; The step of correcting the usage window limit based on the first state of charge information and the second state of charge information to obtain the corrected usage window limit includes: If the second state of charge information is in the second state and the second state of charge information meets the second preset condition, then obtain the second maximum remaining capacity of the second system battery, the first maximum available capacity of the first system battery, and the second maximum available capacity of the second system battery. Obtain the difference between the first maximum remaining power and 100% of the first power level, and obtain the first rechargeable capacity of the first battery system based on the product of the first power difference and the first maximum usable capacity; and Based on the difference between the second maximum remaining power and the second 100% power, the second rechargeable capacity of the second system battery is obtained by multiplying the second power difference with the second maximum available capacity. The first rechargeable capacity and the second rechargeable capacity are compared to correct the usage window limit, resulting in a corrected usage window limit.
6. The method as described in claim 5, characterized in that, The usage window limit includes a first usage window upper limit value corresponding to the first system battery and a second usage window upper limit value corresponding to the second system battery; The step of comparing the first rechargeable capacity and the second rechargeable capacity to correct the usage window limit and obtain a corrected usage window limit includes: If the first rechargeable capacity is greater than the second rechargeable capacity, then obtain a third difference between the first rechargeable capacity and the second rechargeable capacity, and obtain a third ratio between the third difference and the first maximum available capacity, so as to correct the first usage window upper limit to the third ratio and correct the second usage window upper limit to 100%. If the second rechargeable capacity is greater than the first rechargeable capacity, then a fourth difference between the second rechargeable capacity and the first rechargeable capacity is obtained, and a fourth ratio between the fourth difference and the second maximum available capacity is obtained, so as to correct the first usage window upper limit to 100% and correct the second usage window upper limit to the fourth ratio.
7. A SOC (State of Charge) prediction device for a lithium battery hybrid system, characterized in that, The lithium battery hybrid system includes a first battery system and a second battery system, and the device includes: The information acquisition module is used to acquire the usage window limit of the lithium battery hybrid system, the first state of charge information of the first system battery, and the second state of charge information of the second system battery. The numerical correction module is used to correct the usage window limit based on the first state of charge information and the second state of charge information to obtain the corrected usage window limit. A power prediction module is used to obtain the first remaining power of the first system battery, and to predict the second remaining power of the second system battery based on the first remaining power and the corrected usage window limit. The usage window limit includes a first usage window upper limit value corresponding to the first system battery, a second usage window upper limit value corresponding to the second system battery, a first usage window lower limit value corresponding to the first system battery, and a second usage window lower limit value corresponding to the second system battery. The first remaining power includes a first maximum remaining power and a first minimum remaining power, and the second remaining power includes a second maximum remaining power and a second minimum remaining power; The power prediction module is also used to obtain the first maximum available capacity of the first system battery and the second maximum available capacity of the second system battery. The second maximum remaining power is determined based on the modified second usage window upper limit, the difference between the modified first usage window upper limit and the first maximum remaining power, and the ratio between the first maximum available capacity and the second maximum available capacity. The second minimum remaining power is determined based on the modified second usage window lower limit, the difference between the first minimum remaining power and the modified first usage window lower limit, and the ratio between the first maximum available capacity and the second maximum available capacity.
8. A computer device, characterized in that, include: One or more processors; Memory; And one or more applications, wherein the one or more applications are stored in the memory and configured to be executed by the processor to implement the SOC power prediction method for the lithium battery hybrid system according to any one of claims 1 to 6.
9. A computer-readable storage medium, characterized in that, It stores a computer program, which is loaded by a processor to execute the steps in the SOC power prediction method for the lithium battery hybrid system according to any one of claims 1 to 6.