State of charge calibration method, device, computer equipment and storage medium

Abstract

The present application relates to a state of charge calibration method, device, computer equipment and storage medium. The method includes: when the energy storage component of the hybrid device meets the charge calibration conditions, determining the usable state of charge of the energy storage component during the charging and discharging process; obtaining the external use range of the state of charge of the energy storage component and the internal true range of the state of charge; mapping the usable state of charge in the external use range of the state of charge with the high-end calibration value in the internal true range of the state of charge to obtain the internal and external mapping relationship of the energy storage component; controlling the energy storage component to charge and discharge according to the internal and external mapping relationship, and performing high-end state of charge calibration on the energy storage component. The use of this method can improve the accuracy of the state of charge calibration while meeting the state of charge calibration requirements in a wide range of usage scenarios.

Description

Technical Field

[0001] The present application relates to the field of battery management technology, and in particular to a state of charge calibration method, device, computer equipment, storage medium and computer program product. Background Art

[0002] Hybrid equipment refers to equipment that uses two or more power sources as driving force. For example, hybrid vehicles usually use fuel cells and power batteries as power sources. For hybrid vehicles, the power battery's state of charge SOC (State Of Charge) is an important parameter for battery management and is also the basic control parameter for each control unit of the vehicle.

[0003] At present, hybrid vehicles usually calibrate the battery's state of charge by using low-end static correction and external plug-in charging full-charge correction. As the name suggests, low-end static correction requires the hybrid vehicle to be in a static state to be accurately calibrated, and low-end static correction requires a large amount of experimental test data for data support. The workload is large and the actual use effect is difficult to guarantee. The external plug-in charging full-charge correction depends on the driving conditions of the hybrid vehicle. If the external plug-in charging is not performed for a long time, the probability of triggering the battery full-charge correction is low.

[0004] Therefore, for hybrid vehicles, the currently commonly used SOC calibration method is too dependent on the overall vehicle operating conditions of the hybrid vehicle, and it is difficult to meet the SOC calibration needs of hybrid vehicles in a wide range of usage scenarios. Summary of the invention

[0005] Based on this, it is necessary to provide a state of charge calibration method, device, computer equipment, computer readable storage medium and computer program product to address the above technical problems, which can improve the accuracy of state of charge calibration while meeting the state of charge calibration requirements in a wide range of usage scenarios.

[0006] In a first aspect, the present application provides a method for calibrating a state of charge. The method comprises:

[0007] When the energy storage component of the hybrid device meets the charge calibration condition, determining the usable charge state of the energy storage component during the charging and discharging process;

[0008] Obtaining an external usage range of the state of charge of the energy storage component and an internal real range of the state of charge;

[0009] Mapping the usable state of charge in the state of charge external usage interval with the high-end calibration value in the state of charge internal real interval to obtain the internal and external mapping relationship of the energy storage component;

[0010] The energy storage component is controlled to charge and discharge according to the internal and external mapping relationship, and a high-end calibration of the state of charge of the energy storage component is performed.

[0011] In the above embodiment, when the energy storage component of the hybrid device meets the charge calibration condition, the usable state of charge of the energy storage component during the charging and discharging process can be determined. The usable state of charge can characterize the upper limit of the state of charge that the energy storage component can reach in the current usage scenario. By mapping the usable state of charge in the external use interval of the state of charge with the high-end calibration value in the internal real interval of the state of charge, the interval mapping between the external use interval of the state of charge and the internal real interval of the state of charge can be completed, so that when the energy storage component is subsequently controlled to charge and discharge according to the internal and external mapping relationship, the upper limit of the state of charge of the energy storage component can reach the high-end calibration condition. Even in the case of non-external plug-in charging, the high-end state of charge calibration of the energy storage component can also be triggered, thereby improving the accuracy of the state of charge calibration while reducing the dependence of the high-end state of charge calibration on the operating conditions of the entire vehicle, thereby improving the universality of the state of charge calibration method.

[0012] In some embodiments, the method further comprises:

[0013] Determining the cumulative number of charge and discharge cycles performed by the energy storage component since the last state of charge calibration;

[0014] When the accumulated number of cycles reaches a preset number threshold, it is determined that the energy storage component meets the state of charge calibration condition.

[0015] In the above embodiment, by recording the cumulative number of charge and discharge cycles performed by the energy storage component since the last state of charge calibration, and comparing the accumulated number of cycles with a preset number threshold, it is determined whether the energy storage component meets the state of charge calibration condition, thereby effectively improving the accuracy and efficiency of the state of charge calibration condition judgment.

[0016] In some embodiments, determining the usable state of charge of the energy storage component during the charging and discharging process includes:

[0017] Obtaining charge and discharge cycle information of the energy storage component;

[0018] Determine, according to the charge-discharge cycle information, upper limits of each state of charge obtained by the energy storage component when executing each charge-discharge cycle within the cumulative number of cycles;

[0019] The minimum state of charge upper limit value among the state of charge upper limit values ​​is determined as the usable state of charge of the energy storage component during the charging and discharging process.

[0020] In the above embodiment, by determining the minimum state of charge upper limit value from each charge and discharge cycle corresponding to the cumulative number of cycles, and determining the minimum state of charge upper limit value as the usable state of charge of the energy storage component, the probability of the energy storage component triggering the high-end state of charge calibration during the charge and discharge process can be effectively increased.

[0021] In some embodiments, controlling the energy storage component to charge and discharge according to the internal and external mapping relationship and performing high-end calibration of the state of charge of the energy storage component includes:

[0022] Controlling the energy storage component to charge and discharge according to the internal and external mapping relationship;

[0023] Acquiring charging and discharging information of the energy storage component during the charging and discharging process, wherein the charging and discharging information includes a real-time state of charge of the energy storage component;

[0024] When it is determined that the energy storage component meets the high-end calibration condition based on the charge and discharge information, the real-time state of charge of the energy storage component is corrected to the high-end calibration value.

[0025] In the above embodiment, whether the energy storage component meets the high-end calibration condition is determined through the charge and discharge information of the energy storage component during the charge and discharge process, and only when the energy storage component meets the high-end calibration condition is the real-time state of charge of the energy storage component corrected at the high end, which can effectively reduce the probability of the energy storage component mistakenly triggering the high-end correction, resulting in the low accuracy of the charge state after calibration, and improve the accuracy of the high-end calibration of the charge state of the energy storage component.

[0026] In some embodiments, the charge and discharge information also includes the charge and discharge state and the cell voltage of the energy storage component; the method also includes:

[0027] When the charge-discharge state of the energy storage component is a recharging state, obtaining a voltage threshold of the energy storage component, wherein the voltage threshold is determined according to the high-end calibration value;

[0028] When the cell voltage of the energy storage component is greater than the voltage threshold, it is determined that the energy storage component meets the high-end calibration condition.

[0029] In the above embodiment, by acquiring the charge and discharge state and the cell voltage of the energy storage component during the charging process, it is determined that the energy storage component meets the high-end calibration condition when the charge and discharge state is the recharging state and the cell voltage is greater than the voltage threshold, thereby improving the accuracy of determining whether the charge state of the energy storage component has entered the high-end area, thereby improving the accuracy of the high-end calibration of the charge state of the energy storage component.

[0030] In some embodiments, the charge and discharge information further includes a recharge current and a temperature of the energy storage component; and when the cell voltage of the energy storage component is greater than the voltage threshold, determining that the energy storage component meets the high-end calibration condition includes:

[0031] When the cell voltage of the energy storage component is greater than the voltage threshold, determining the current threshold of the energy storage component according to the temperature of the energy storage component;

[0032] When the recharge current of the energy storage component is less than the current threshold, it is determined that the energy storage component meets the high-end calibration condition.

[0033] In the above embodiment, when the battery cell voltage is greater than the voltage threshold, by further acquiring the recharge current and temperature of the energy storage component, it is possible to accurately determine whether the charge state of the energy storage component is in the high-end region based on the comparison result of the recharge current and the current threshold determined based on the temperature, thereby effectively improving the accuracy of the judgment of the high-end calibration condition, and further improving the accuracy of the charge state obtained after the subsequent high-end calibration.

[0034] In some embodiments, the method further comprises:

[0035] Acquire the charge and discharge parameter types corresponding to each information data contained in the charge and discharge information, and the valid conditions corresponding to each charge and discharge parameter type;

[0036] Performing validity check on each of the information data included in the charge and discharge information based on each of the validity conditions;

[0037] In the case that each of the information data satisfies the corresponding validity conditions, it is determined whether the energy storage component meets the high-end calibration conditions based on the charge and discharge information.

[0038] In the above embodiment, before using the charge and discharge information to judge the high-end calibration condition, the validity of the charge and discharge information is checked, so that the charge and discharge information used for the subsequent high-end calibration condition judgment can be valid information, thereby improving the accuracy of the high-end calibration condition judgment.

[0039] In a second aspect, the present application also provides a state of charge calibration device. The device comprises:

[0040] A charge calibration condition judgment module, used to determine the usable charge state of the energy storage component during the charging and discharging process when the energy storage component of the hybrid device meets the charge calibration condition;

[0041] A relationship mapping module is used to obtain the external usage interval of the state of charge of the energy storage component and the internal real interval of the state of charge; the usable state of charge in the external usage interval of the state of charge is mapped with the high-end calibration value in the internal real interval of the state of charge to obtain the internal and external mapping relationship of the energy storage component;

[0042] The high-end calibration module is used to control the energy storage component to charge and discharge according to the internal and external mapping relationship, and to perform high-end calibration of the state of charge of the energy storage component.

[0043] In a third aspect, the present application further provides a computer device, wherein the computer device comprises a memory and a processor, wherein the memory stores a computer program, and when the processor executes the computer program, the steps of the above-mentioned state of charge calibration method are implemented.

[0044] In a fourth aspect, the present application further provides a computer-readable storage medium having a computer program stored thereon, and when the computer program is executed by a processor, the steps of the above-mentioned state of charge calibration method are implemented.

[0045] In a fifth aspect, the present application further provides a computer program product, wherein the computer program product comprises a computer program, and when the computer program is executed by a processor, the steps of the above-mentioned state of charge calibration method are implemented.

[0046] The above-mentioned state of charge calibration method, device, computer equipment, storage medium and computer program product can determine the usable state of charge of the energy storage component during the charging and discharging process when the energy storage component of the hybrid device meets the charge calibration conditions. The usable state of charge can characterize the upper limit of the state of charge that the energy storage component can reach in the current usage scenario. By mapping the usable state of charge in the external use range of the state of charge with the high-end calibration value in the internal real range of the state of charge, the interval mapping between the external use range of the state of charge and the internal real range of the state of charge can be completed, so that when the energy storage component is subsequently controlled to charge and discharge according to the internal and external mapping relationship, the upper limit of the state of charge of the energy storage component can reach the high-end calibration condition. Even in the case of non-external plug-in charging, it can also trigger the high-end state of charge calibration of the energy storage component, thereby improving the accuracy of the state of charge calibration while reducing the dependence of the high-end state of charge calibration on the operating conditions of the whole vehicle, thereby improving the universality of the state of charge calibration method. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] FIG1 is a block diagram of a hybrid device in some embodiments;

[0048] FIG2 is a schematic flow chart of a state of charge calibration method in some embodiments;

[0049] FIG3 is a schematic flow chart of a state of charge calibration method in some other embodiments;

[0050] FIG4 is a schematic diagram of a flow chart of determining a usable state of charge of an energy storage component during a charging and discharging process in some embodiments;

[0051] 5 is a schematic diagram of a process of controlling the energy storage component to charge and discharge according to the internal and external mapping relationship and performing high-end calibration of the state of charge of the energy storage component in some embodiments;

[0052] FIG6 is a schematic flow chart of a state of charge calibration method in some other embodiments;

[0053] FIG7 is a schematic flow chart of a state of charge calibration method in some other embodiments;

[0054] FIG8 is a schematic diagram showing the change of the SOC internal and external mapping relationship before and after calibration in some embodiments;

[0055] FIG9 is a block diagram of a state of charge calibration device in some embodiments;

[0056] FIG. 10 is a diagram of the internal structure of a computer device in some embodiments. DETAILED DESCRIPTION

[0057] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0058] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0059] Reference to "embodiments" herein means that the specific features, structures, or characteristics described in conjunction with the embodiments may be included in at least some embodiments of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0060] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0061] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0062] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0063] Calibration of the state of charge of hybrid equipment, such as the power battery of hybrid vehicles, is a key step to improve the accuracy of battery management and vehicle control accuracy. During the use of hybrid vehicles, if an external plug is not used for charging, the state of charge of the power battery is relatively narrow, basically between 30% and 80%. At this time, the hybrid vehicle can only calibrate the state of charge of the power battery by low-end static correction. The low-end static correction process requires the hybrid vehicle to be in a static state to be realized, and the low-end static correction requires a large amount of experimental test data for data support, which is labor-intensive and the actual use effect is difficult to guarantee.

[0064] The high-accuracy full charge correction of external plug charging depends on the driving conditions of the hybrid vehicle, that is, it can only be realized under the condition of external plug charging. If the external plug charging is not performed for a long time, the probability of triggering the full charge correction of the battery is low. Therefore, for hybrid vehicles, the currently commonly used SOC calibration method is too dependent on the vehicle's operating conditions, and it is difficult to meet the SOC calibration needs of hybrid vehicles in a wide range of usage scenarios.

[0065] In order to improve the accuracy of the state of charge calibration of the hybrid device while meeting the state of charge calibration requirements in a wide range of usage scenarios, the usable state of charge of the energy storage component during the charging and discharging process can be determined when the energy storage component of the hybrid device meets the charge calibration conditions. The usable state of charge can characterize the upper limit of the state of charge that the energy storage component can achieve in the current usage scenario. By mapping the high-end calibration value of the energy storage component with the usable state of charge of the energy storage component, when the energy storage component is subsequently controlled to charge and discharge according to the internal and external mapping relationship, the upper limit of the state of charge of the energy storage component can meet the high-end calibration conditions. Even in the case of non-external plug-in charging, the high-end state of charge calibration of the energy storage component can also be triggered. While improving the accuracy of the state of charge calibration, the dependence of the high-end state of charge calibration on the operating conditions of the entire vehicle is reduced, thereby improving the universality of the state of charge calibration method.

[0066] The state of charge calibration method provided in the embodiment of the present application can be applied to the hybrid device 100 as shown in FIG1 . The hybrid device 100 includes an energy storage component 101 and an energy storage management system 102 for performing energy storage management on the energy storage component 101. The data storage system can store data that the energy storage management system 102 needs to process. The data storage system can be integrated on the energy storage management system 102, or it can be placed on a cloud or other network server. The energy storage management system 102 can determine the usable state of charge of the energy storage component 101 during the charging and discharging process when the energy storage component 101 of the hybrid device 100 meets the charge calibration condition, map the high-end calibration value of the energy storage component 101 with the usable state of charge of the energy storage component 101, obtain the internal and external mapping relationship of the energy storage component 101, control the energy storage component 101 to charge and discharge according to the internal and external mapping relationship, and perform high-end calibration of the state of charge on the energy storage component 101.

[0067] The hybrid device 100 may be any device that uses two or more power sources as driving force and has high-end modification requirements, such as a hybrid vehicle.

[0068] The energy storage component 101 is a power source that uses electricity as a driving force source to provide driving force for the hybrid device 100, such as a power battery in a hybrid vehicle.

[0069] The energy storage management system 102 is a management system for performing energy storage management on the energy storage component 101. It is responsible for monitoring and controlling the energy storage component 101, and at the same time feeding back the relevant information of the energy storage component 101 to the whole machine control system of the hybrid device 100, so that the whole machine control system can control the hybrid device 100 based on the relevant information of the energy storage component 101.

[0070] In some of the embodiments, the energy storage management system 102 may be a battery management system BMS (Battery Management System) in a hybrid vehicle. In addition to monitoring and controlling the power battery in the hybrid vehicle, such as battery status detection, charge and discharge control, battery balancing, battery health prediction, fault protection and diagnosis, etc., the BMS may also communicate with other systems of the hybrid vehicle, such as the vehicle control system, to transmit battery status information, and receive control instructions when necessary, and coordinate with the vehicle control system to control the operation of the power battery.

[0071] In some embodiments, as shown in FIG. 2 , a state of charge calibration method is provided, and the method is applied to the energy storage management system 102 in FIG. 1 as an example for description, including the following steps:

[0072] S202, when the energy storage component of the hybrid device meets the charge calibration condition, determine the usable charge state of the energy storage component during the charging and discharging process.

[0073] Among them, the charge calibration condition is a preset judgment condition used to determine whether the energy storage component needs to perform a high-end calibration of the charge state. When the energy storage component of the hybrid device meets the charge calibration condition, it means that there may be deviations in the charge state of the energy storage component, and a high-end calibration is required to improve the accuracy of the charge state.

[0074] In some of the embodiments, time events may be pre-set in the energy storage management system, for example, periodic high-end state of charge calibration of the energy storage component at preset time intervals. When the duration of the high-end state of charge calibration interval of the energy storage component of the hybrid device reaches the preset time interval, it can be determined that the energy storage component meets the charge calibration condition.

[0075] Among them, the charging and discharging process of the energy storage component refers to the charging and discharging cycle process of the energy storage component, that is, the process of the energy storage component completing a complete charging and discharging process. This process is crucial for evaluating the performance and service life of the energy storage component and determining when the energy storage component needs to be replaced.

[0076] The usable state of charge of the energy storage component during the charging and discharging process refers to the upper limit of the state of charge that the energy storage component can reach during the charging process under the current usage conditions. It can also be considered as the maximum percentage of charge allowed for the energy storage component during the charging process.

[0077] In some of the embodiments, the usable state of charge of the energy storage component during the charging and discharging process can be determined in advance by the designer according to the use requirements of the hybrid device and stored in the energy storage management system. For example, in order to improve the service life, use safety and charging and discharging efficiency of the battery in the hybrid device, the designer will pre-set the SOC use range for the hybrid vehicle, where the upper limit of the range can be considered as the usable state of charge of the battery during the charging and discharging process. For example, the SOC use range of the hybrid vehicle can be designed to be 30%~80%, at which time 80% can be considered as the usable state of charge of the power battery. The whole vehicle control system of the hybrid vehicle will stop charging when the SOC of the power battery reaches 80%, so as to improve the service life, use safety and charging and discharging efficiency of the battery in the hybrid device.

[0078] In other embodiments, since the performance of the energy storage component will gradually decline with the increase in the number of charge and discharge cycles, in order to improve the accuracy of determining the usable state of charge, the energy storage management system may also determine the usable state of charge of the energy storage component during the charge and discharge process by detecting the actual state of charge obtained during the actual charge and discharge process of the energy storage component. For example, the highest percentage of charge reached by the energy storage component in the most recent charge and discharge cycle is determined as the usable state of charge, or the highest percentage of charge reached by the energy storage component the most times is determined as the usable state of charge.

[0079] In some embodiments, the energy storage management system may determine a usable state of charge of the energy storage component during the charging and discharging process when the energy storage component of the hybrid device meets the charge calibration condition.

[0080] S204, mapping the high-end calibration value of the energy storage component with the usable state of charge of the energy storage component to obtain an internal and external mapping relationship of the energy storage component.

[0081] Among them, the high-end calibration value of the energy storage component refers to the state value that the state of charge needs to reach when the energy storage component performs high-end calibration of the state of charge. It can be understood that the high-end calibration value can be determined in advance by the designer based on the performance parameters of the energy storage component.

[0082] In some of the embodiments, the designer may calibrate the state of charge of the energy storage component according to the high-end voltage of the battery cell of the energy storage component to determine the high-end calibration value of the energy storage component.

[0083] The internal and external mapping relationship of the energy storage component refers to the mapping relationship between the actual charge state of the energy storage component in the energy storage management system and the displayed charge state of the energy storage component in the overall control system of the hybrid device.

[0084] It can be understood that after detecting the actual state of charge of the energy storage component, the energy storage management system can determine the displayed state of charge that needs to be fed back to the whole machine control system based on the mapping relationship between the actual state of charge and the displayed state of charge, that is, the internal and external mapping relationship. The whole machine control system of the hybrid device will control the charging and discharging of the energy storage component according to the displayed state of charge. For example, if the designer pre-sets the use range of the energy storage component to 30%~80%, then during the charging process of the energy storage component, the whole machine control system will stop charging the energy storage component when it determines that the state of charge of the energy storage component reaches 80% based on the displayed state of charge. Similarly, during the discharging process of the energy storage component, the whole machine control system will stop discharging the energy storage component when it determines that the state of charge of the energy storage component reaches 30% based on the displayed state of charge.

[0085] During normal use, the original internal and external mapping relationship of the energy storage component is an equal mapping, that is, the actual state of charge is equal to the displayed state of charge. Therefore, when the energy storage component is charged and discharged based on the equal mapping relationship, due to the limitation of the use range, the usable state of charge that the energy storage component can reach will not trigger the energy storage component to perform high-end calibration of the state of charge. By mapping the high-end calibration value of the energy storage component with the usable state of charge of the energy storage component to obtain the internal and external mapping relationship of the energy storage component, the original internal and external mapping relationship can be changed to an equal mapping, so that when the energy storage component is charged and discharged based on the internal and external mapping relationship, it can trigger the high-end calibration of the state of charge of the energy storage component.

[0086] Taking the high-end calibration value of 95% and the usable state of charge of 80% as an example, by mapping the high-end calibration value of 95% to the usable state of charge of 80%, an internal and external mapping relationship is obtained. In the relationship between internal and external factors, the actual state of charge of 95% in the energy storage management system is equivalent to the usable state of charge of 80%. That is, during the charging process of the energy storage component, when the actual state of charge of the energy storage component reaches 95%, the energy storage management system, based on the internal and external mapping relationship, feeds back a displayed state of charge of 80% to the whole machine management system. Even if the usage range of the energy storage component is 30%~80%, the actual state of charge of the energy storage component can still reach the high-end calibration value, providing an opportunity for subsequent high-end calibration of the state of charge of the energy storage component.

[0087] In some embodiments, after determining the usable state of charge of the energy storage component, the energy storage management system may map the high-end calibration value of the energy storage component with the usable state of charge of the energy storage component to obtain an internal and external mapping relationship of the energy storage component.

[0088] S206, controlling the energy storage component to charge and discharge according to the internal and external mapping relationship, and performing a high-end calibration of the state of charge of the energy storage component.

[0089] Among them, the high-end calibration of the state of charge refers to the calibration operation of calibrating the state of charge of the energy storage component when the charge and discharge voltage of the energy storage component is in the high-end voltage range. The open circuit voltage (OCV) curve of the energy storage component is a curve that describes the relationship between the voltage and capacity of the energy storage component in the open state. The curve can usually be divided into three areas, namely the high-end area, the low-end area and the platform area. Among them, the high-end area refers to the part with higher voltage in the OCV curve of the energy storage component, which usually corresponds to the area where the energy storage component is close to the full charge state. Therefore, the high-end calibration of the state of charge can also be considered as an operation to calibrate the state of charge of the energy storage component when the energy storage component is charged and discharged to a nearly full charge state. It can be understood that the high-end voltage range of the energy storage component can be determined according to the actual situation of the energy storage component battery cell. For example, in some lithium iron phosphate batteries, the high-end voltage range can be a voltage>3.45V. When the charge and discharge voltage of the energy storage component is in the high-end range, the state of charge of the energy storage component is close to the full charge state, such as 90%~100%, or 95%~100%.

[0090] In some embodiments, the energy storage management system may control the energy storage component to charge and discharge according to the internal and external mapping relationship, and perform high-end state of charge calibration on the energy storage component when the energy storage component meets the high-end calibration conditions.

[0091] In the above-mentioned state of charge calibration method, when the energy storage component of the hybrid device meets the charge calibration conditions, the usable state of charge of the energy storage component during the charging and discharging process can be determined. The usable state of charge can characterize the upper limit of the state of charge that the energy storage component can reach in the current usage scenario. By mapping the high-end calibration value of the energy storage component with the usable state of charge of the energy storage component, when the energy storage component is subsequently controlled to charge and discharge according to the internal and external mapping relationship, the upper limit of the state of charge of the energy storage component can reach the high-end calibration condition. Even in the case of non-external plug-in charging, it can also trigger the high-end state of charge calibration of the energy storage component, thereby improving the accuracy of the state of charge calibration while reducing the dependence of the high-end state of charge calibration on the operating conditions of the entire vehicle, thereby improving the universality of the state of charge calibration method.

[0092] In the state of charge calibration method, in addition to setting a time event trigger in the energy storage management system, in other embodiments, as shown in FIG. 3 , the state of charge calibration method further includes:

[0093] S302, determining the cumulative number of charge and discharge cycles performed by the energy storage component since the last state of charge calibration according to the charge and discharge cycle information.

[0094] The number of charge and discharge cycles refers to the count after the energy storage component completes a complete charge and discharge process, and the cumulative cycle count of the charge and discharge cycle refers to the cumulative count of the energy storage component performing a complete charge and discharge process from the last state of charge calibration to the current charge and discharge cycle. For example, if the energy storage component has performed 10 complete charge and discharge processes from the last state of charge calibration to the current charge and discharge cycle, the cumulative cycle count is 10 times.

[0095] In some embodiments, the energy storage management system may record the cumulative number of charge and discharge cycles of the energy storage component after the last state of charge calibration.

[0096] In other embodiments, the energy storage management system may obtain the charge and discharge cycle information of the energy storage component, and determine the cumulative number of charge and discharge cycles performed by the energy storage component since the last state of charge calibration based on the charge and discharge cycle information.

[0097] S304: When the accumulated number of cycles reaches a preset number threshold, determine that the energy storage component meets the state of charge calibration condition.

[0098] Among them, the preset number threshold is a preset threshold parameter used to determine whether the energy storage component needs to be calibrated for the state of charge again. The preset number threshold can be determined by the designer based on the accuracy requirements of the state of charge. When the cumulative number of cycles reaches the preset number threshold, it means that a long time has passed since the last state of charge calibration of the energy storage component, and the state of charge detection may have deviated, and it needs to be calibrated again.

[0099] In some embodiments, after obtaining the cumulative number of cycles of the energy storage component, the energy storage management system can call a preset number threshold, compare the cumulative number of cycles with the preset number threshold, and determine that the energy storage component meets the charge state calibration condition when the cumulative number of cycles reaches the preset number threshold.

[0100] In other embodiments, when the accumulated number of cycles does not reach a preset number threshold, it can be determined that the energy storage component temporarily does not meet the state of charge calibration condition, and the energy storage component can be controlled to charge and discharge according to the original internal and external mapping relationship.

[0101] In the above embodiment, by recording the cumulative number of charge and discharge cycles performed by the energy storage component since the last state of charge calibration, and comparing the accumulated number of cycles with a preset number threshold, it is determined whether the energy storage component meets the state of charge calibration condition, thereby effectively improving the accuracy and efficiency of the state of charge calibration condition judgment.

[0102] Determination of the usable state of charge of the energy storage component is one of the key steps that will affect whether the energy storage component can successfully trigger the high-end calibration of the state of charge. In addition to determining the upper limit of the usage range preset by the designer as the usable state of charge of the energy storage component, in some embodiments, as shown in FIG. 4 , determining the usable state of charge of the energy storage component during the charging and discharging process includes:

[0103] S402, obtaining charging and discharging cycle information of the energy storage component.

[0104] Among them, the charge and discharge cycle information is information data obtained by recording relevant information when the energy storage component is charged and discharged. The charge and discharge cycle information can record the number of charge and discharge cycles of the energy storage component, the charge state calibration of the energy storage component, and the operation of the energy storage component during each charge and discharge cycle. For example, when the energy storage management system charges and discharges the energy storage component, it will record the maximum power percentage that the energy storage component can reach during the charging process, which is the upper limit of the charge state of the charge and discharge cycle.

[0105] In some embodiments, the energy storage management system may obtain the charge and discharge cycle information of the energy storage component when determining that the energy storage component meets the charge calibration condition.

[0106] S404, determining, based on the charge-discharge cycle information, upper limits of various states of charge obtained by the energy storage component when executing various charge-discharge cycles within the accumulated number of cycles.

[0107] The upper limit of each state of charge refers to the maximum percentage of charge reached by the energy storage component during each charge and discharge cycle.

[0108] In some embodiments, after obtaining the charge and discharge cycle information of the energy storage component, the energy storage management system can extract the charge and discharge cycle information to determine the upper limit values ​​of each state of charge obtained when the energy storage component performs each charge and discharge cycle within the accumulated number of cycles.

[0109] S406: Determine the minimum state of charge upper limit value among the state of charge upper limit values ​​as the usable state of charge of the energy storage component during the charging and discharging process.

[0110] In some embodiments, after obtaining the upper limit values ​​of each state of charge, the energy storage relationship system can sort the upper limit values ​​of each state of charge according to the numerical value, determine the minimum upper limit value of the state of charge from each state of charge upper limit value, and determine the minimum upper limit value of the state of charge as the usable state of charge of the energy storage component during the charging and discharging process.

[0111] In the above embodiment, by determining the minimum state of charge upper limit value from each charge and discharge cycle corresponding to the cumulative number of cycles, and determining the minimum state of charge upper limit value as the usable state of charge of the energy storage component, the probability of the energy storage component triggering the high-end state of charge calibration during the charge and discharge process can be effectively increased.

[0112] In some embodiments, S204, mapping the high-end calibration value of the energy storage component with the usable state of charge of the energy storage component to obtain an internal and external mapping relationship of the energy storage component includes:

[0113] The external usage range of the state of charge of the energy storage component and the internal real range of the state of charge are obtained. The usable state of charge in the external usage range of the state of charge is mapped with the high-end calibration value in the internal real range of the state of charge to obtain the internal and external mapping relationship of the energy storage component.

[0114] Among them, the external usage range of the state of charge refers to the usage range of the energy storage component fed back by the energy storage management system to the whole machine control system of the hybrid equipment. For example, in a hybrid vehicle, the displayed SOC range is fed back by the BMS to the vehicle controller.

[0115] The real range of the state of charge refers to the range composed of the real state of charge of the energy storage component obtained by the energy storage management system through detection of the energy storage component, such as the real SOC range inside the BMS in a hybrid vehicle.

[0116] In some embodiments, after obtaining the usable state of charge of the energy storage component during the charging and discharging process, the energy storage management system can obtain the external usage interval of the state of charge of the energy storage component and the internal real interval of the state of charge, determine the position of the usable state of charge in the external usage interval of the state of charge, and the position of the high-end calibration value in the internal real interval of the state of charge, map the usable state of charge in the external usage interval of the state of charge with the high-end calibration value in the internal real interval of the state of charge, and obtain the internal and external mapping relationship of the energy storage component.

[0117] For example, by mapping the usable state of charge in the external usage interval of the state of charge with the high-end calibration value in the internal real interval of the state of charge, the (0-high-end calibration value) in the internal real interval of the state of charge can be mapped to the (0-usable state of charge) in the external usage interval of the state of charge, and the (high-end calibration value-100) in the internal real interval of the state of charge can be mapped to the (usable state of charge-100) in the external usage interval of the state of charge, thereby obtaining the internal and external mapping relationship of the energy storage component.

[0118] In some embodiments, after performing high-end SOC calibration on the energy storage component, the energy storage management system can map the internal real range of SOC (0-100) to the external usage range of SOC (0-100), and use this as the calibrated internal and external mapping relationship to control and manage the energy storage component.

[0119] In the above embodiment, by mapping the usable state of charge in the external use interval of the state of charge with the high-end calibration value in the internal real interval of the state of charge, the interval mapping between the external use interval of the state of charge and the internal real interval of the state of charge can be completed. When the energy storage component is subsequently controlled to be charged and discharged based on the internal and external mapping relationship of the energy storage component, the probability of triggering the high-end calibration of the state of charge of the energy storage component can be increased, and the accuracy of the charging and discharging control of the energy storage component can be improved.

[0120] Performing high-end calibration of the state of charge on the energy storage component can effectively improve the accuracy of the state of charge calibration. In some embodiments, as shown in FIG. 5 , S206, controlling the energy storage component to charge and discharge according to the internal and external mapping relationship, and performing high-end calibration of the state of charge on the energy storage component includes:

[0121] S502, controlling the energy storage component to charge and discharge according to the internal and external mapping relationship.

[0122] In some embodiments, the energy storage management system will coordinate with the whole machine control system to control the energy storage component to charge and discharge according to the obtained internal and external mapping relationship. During the charging and discharging process, the energy storage management system will monitor the charge state of the energy storage component, and after obtaining the real-time charge state of the energy storage component, determine the use charge state corresponding to the real-time charge state based on the internal and external mapping relationship, which needs to be fed back to the whole machine control system.

[0123] In some of the embodiments, the energy storage management system can determine the usage state of charge corresponding to the real-time state of charge of the energy storage component from the external usage interval of the state of charge based on the internal and external mapping relationship between the external usage interval of the state of charge and the internal real interval of the state of charge, and feed back the usage state of charge to the whole machine control system.

[0124] S504, acquiring charging and discharging information of the energy storage component during the charging and discharging process, where the charging and discharging information includes a real-time charge state of the energy storage component.

[0125] Among them, the charging and discharging information is information data used to indicate the operating status of the energy storage component during the charging and discharging process, and may include, for example, the charging and discharging status of the energy storage component, the real-time state of charge, the cell voltage, etc.

[0126] In some embodiments, when the energy storage management system controls the charging and discharging of the energy storage component, it will record the charging and discharging information of the energy storage component in real time, and the charging and discharging information includes the real-time charge state of the energy storage component.

[0127] S506, when it is determined based on the charge and discharge information that the energy storage component meets the high-end calibration condition, the real-time state of charge of the energy storage component is corrected to a high-end calibration value.

[0128] Among them, the high-end calibration condition is a preset condition for determining whether the energy storage component can be calibrated at the high end. The high-end calibration refers to a calibration method in which the state of charge of the energy storage component is calibrated when the energy storage component is close to or reaches a fully charged state, so that the calibrated state of charge can reflect the actual remaining power of the energy storage component. Therefore, when performing high-end calibration on the energy storage component, it is necessary to determine whether the energy storage component meets the high-end calibration conditions, for example, whether the energy storage component is close to or reaches a fully charged state.

[0129] In some embodiments, the energy storage management system can determine whether the energy storage component meets the high-end calibration conditions based on the charging and discharging information of the energy storage component during the charging and discharging process. If the energy storage component meets the high-end calibration conditions, the real-time charge state of the energy storage component is corrected to the high-end calibration value to achieve high-end correction of the charge state of the energy storage component.

[0130] In the above embodiment, whether the energy storage component meets the high-end calibration condition is determined through the charge and discharge information of the energy storage component during the charge and discharge process, and only when the energy storage component meets the high-end calibration condition is the real-time state of charge of the energy storage component corrected at the high end, which can effectively reduce the probability of the energy storage component mistakenly triggering the high-end correction, resulting in the low accuracy of the charge state after calibration, and improve the accuracy of the high-end calibration of the charge state of the energy storage component.

[0131] Determining whether the energy storage component meets the high-end calibration condition is a key step in triggering the high-end calibration of the charge state of the energy storage component. The following will illustrate how to determine whether the energy storage component meets the high-end calibration condition through several embodiments.

[0132] In some embodiments, the charge and discharge information may include not only the real-time charge state of the energy storage component, but also the charge and discharge state and cell voltage of the energy storage component. The charge state calibration method may also include:

[0133] When the charge and discharge state of the energy storage component is the recharge state, the voltage threshold of the energy storage component is obtained, and the voltage threshold is determined according to the high-end calibration value. When the cell voltage of the energy storage component is greater than the voltage threshold, it is determined that the energy storage component meets the high-end calibration condition.

[0134] Among them, the charge and discharge state of the energy storage component can be a parameter that characterizes the direction and degree of the chemical reaction inside the energy storage component. For example, the charge and discharge state can include the discharge state, the recharge state, etc. The charge state of the energy storage component is the recharge state, which means that the energy storage component is currently receiving electrical energy to restore the internal power, and the energy storage component is gradually changing from a low power state to a high power state. The high-end calibration of the state of charge of the energy storage component can only occur in the recharge state.

[0135] The voltage threshold of the energy storage component is a threshold parameter used to characterize whether the state of charge of the energy storage component enters a high-end region under the current operating condition.

[0136] In some of the embodiments, the voltage threshold can be determined based on the high-end calibration value of the energy storage component. The energy storage management system is pre-set with the correspondence between the high-end calibration value, the energy storage component temperature and the voltage threshold. The energy storage management system can find the pre-set correspondence between the high-end calibration value, the energy storage component temperature and the voltage threshold according to the high-end calibration value and the current temperature of the energy storage component, and determine the voltage threshold that matches the high-end calibration value and the current temperature of the energy storage component. For example, when the charging terminal temperature is 25°C, if the voltage threshold is determined to be 3420mV according to the high-end calibration value, then when the cell voltage is greater than 3420mV, it is determined that the energy storage component meets the high-end calibration condition. It can be understood that when the high-end calibration value is determined, the voltage threshold is inversely correlated with the dimension of the energy storage component, that is, as the temperature rises, the voltage threshold calibrated based on the high-end calibration value will decrease accordingly, wherein the change of the voltage threshold with temperature can be a linear change process, for example, the voltage threshold changes with temperature based on a preset voltage change ratio, or it can be a nonlinear change process.

[0137] In some embodiments, after the energy storage management system obtains the charging and discharging information of the energy storage component during the charging and discharging process, it reads the charging and discharging state and the battery cell voltage of the energy storage component from the charging and discharging information, first determines whether the charging and discharging state is a recharging state, and when the charging and discharging state is a recharging state, obtains the voltage threshold of the energy storage component, and compares the voltage threshold with the read battery cell voltage. When the battery cell voltage of the energy storage component is greater than the voltage threshold, it indicates that the charge state of the energy storage component has entered the high-end area at this time. The energy storage management system can determine that the energy storage component meets the high-end calibration conditions, and perform a high-end calibration operation on the charge state of the energy storage component.

[0138] In other embodiments, when the energy storage management system determines that the charge and discharge state of the energy storage component is not a recharging state, or the cell voltage of the energy storage component is less than or equal to the voltage threshold, it indicates that the charge state of the energy storage component has not entered the high-end area at this time. The energy storage management system can determine that the energy storage component does not meet the high-end calibration conditions and will temporarily not perform a high-end charge state calibration operation on the energy storage component.

[0139] In the above embodiment, by acquiring the charge and discharge state and the cell voltage of the energy storage component during the charging process, it is determined that the energy storage component meets the high-end calibration condition when the charge and discharge state is the recharging state and the cell voltage is greater than the voltage threshold, thereby improving the accuracy of determining whether the charge state of the energy storage component has entered the high-end area, thereby improving the accuracy of the high-end calibration of the charge state of the energy storage component.

[0140] In other embodiments, the charge and discharge information further includes the recharge current and temperature of the energy storage component. When the cell voltage of the energy storage component is greater than the voltage threshold, determining that the energy storage component meets the high-end calibration condition includes:

[0141] When the cell voltage of the energy storage component is greater than the voltage threshold, the current threshold of the energy storage component is determined according to the temperature of the energy storage component. When the recharge current of the energy storage component is less than the current threshold, it is determined that the energy storage component meets the high-end calibration condition.

[0142] Among them, the current threshold is also one of the threshold parameters used to characterize whether the state of charge of the energy storage component enters the high-end area under the current operating conditions. Whether the state of charge enters the high-end area can be determined by the cell voltage and recharge current of the energy storage component during the charging and discharging process.

[0143] In some of the embodiments, the current threshold can be determined based on the temperature of the energy storage component, and the temperature of the energy storage component is inversely correlated with the current threshold, that is, as the temperature rises, the corresponding current threshold will decrease accordingly, wherein the change of the current threshold with temperature can be a linear change process, for example, the current threshold changes with temperature based on a preset current change ratio, or it can be a nonlinear change process.

[0144] In some embodiments, the energy storage management system is pre-set with a corresponding relationship or functional relationship between the temperature of the energy storage component and the current threshold, and the current threshold corresponding to the temperature of the energy storage component can be determined according to the temperature of the energy storage component during the charging and discharging process, and the pre-set corresponding relationship or functional relationship between the temperature of the energy storage component and the current threshold. For example, when the charging terminal temperature is 25°C, the corresponding current threshold is determined to be 0.2C, and when the recharge current is less than 0.2C, it is determined that the energy storage component meets the high-end calibration condition.

[0145] In some embodiments, when the cell voltage of the energy storage component is greater than the voltage threshold, the energy storage management system may continue to read the recharge current and temperature of the energy storage component from the charge and discharge information, determine the current threshold of the energy storage component according to the temperature of the energy storage component, and compare the recharge current with the current threshold. When the recharge current of the energy storage component is less than the current threshold, it can be determined that the state of charge of the energy storage component has entered the high-end area and the energy storage component meets the high-end calibration conditions. The energy storage management system can perform a high-end state of charge calibration operation on the energy storage component.

[0146] In other embodiments, when the energy storage management system determines that the recharge current of the energy storage component is greater than or equal to the current threshold, it means that the charge state of the energy storage component has not actually entered the high-end area at this time. The energy storage management system can determine that the energy storage component does not meet the high-end calibration conditions and will temporarily not perform a high-end charge state calibration operation on the energy storage component.

[0147] In the above embodiment, when the battery cell voltage is greater than the voltage threshold, by further acquiring the recharge current and temperature of the energy storage component, it is possible to accurately determine whether the charge state of the energy storage component is in the high-end region based on the comparison result of the recharge current and the current threshold determined based on the temperature, thereby effectively improving the accuracy of the judgment of the high-end calibration condition, and further improving the accuracy of the charge state obtained after the subsequent high-end calibration.

[0148] In the process of detecting and collecting the charge and discharge information, the acquired charge and discharge information may be invalid due to the collection conditions or other factors. Based on this, in some embodiments, as shown in FIG6 , the charge state calibration method may further include the following steps:

[0149] S602, acquiring the charge and discharge parameter types corresponding to each piece of information data included in the charge and discharge information, and the validity conditions corresponding to each charge and discharge parameter type.

[0150] Among them, the charging and discharging parameter type is type information used to classify the information data contained in the charging and discharging information. For example, the charging and discharging parameter type may include charging and discharging status, battery cell voltage, recharge current, temperature, real-time charge status, etc.

[0151] Among them, the valid condition corresponding to the charge and discharge parameter type is a preset judgment condition for judging whether the information data corresponding to the charge and discharge parameter type is valid data. Each charge and discharge parameter type has its corresponding valid condition. Taking the charge and discharge parameter type including the cell voltage as an example, the valid condition of the cell voltage may be that the voltage value corresponding to the cell voltage belongs to a preset voltage range. When the energy storage management system obtains the cell voltage of the energy storage component, it can judge whether the voltage value of the cell voltage belongs to the preset voltage range. When the voltage value belongs to the preset voltage range, the energy storage management system can determine that the obtained cell voltage is a valid value.

[0152] In some of the embodiments, after acquiring the charging and discharging information of the energy storage component during the charging and discharging process, the energy storage management system may perform a type extraction operation on the parameter type of the charging and discharging information to determine the charging and discharging parameter type corresponding to each information data contained in the charging and discharging information.

[0153] In some of the embodiments, the energy storage management system is pre-set with charge and discharge parameter types corresponding to the respective information data included in the charge and discharge information.

[0154] In some embodiments, the energy storage management system may first obtain the charging and discharging parameter types corresponding to each information data contained in the charging and discharging information, and then determine the valid conditions that match each charging and discharging parameter type from the preset valid conditions according to each charging and discharging parameter type.

[0155] S604: Perform validity check on each information data included in the charge and discharge information based on each validity condition.

[0156] In some embodiments, the energy storage management system may determine the corresponding validity conditions for each information data contained in the charging and discharging information, and perform validity verification on each information data based on the valid conditions corresponding to each information data.

[0157] S606: When all information data satisfy corresponding validity conditions, determine whether the energy storage component meets the high-end calibration conditions based on the charge and discharge information.

[0158] In some embodiments, when it is determined that each information data satisfies the corresponding validity conditions, the energy storage management system may continue to determine whether the energy storage component meets the high-end calibration conditions based on the charge and discharge information.

[0159] In the above embodiment, before using the charge and discharge information to judge the high-end calibration condition, the validity of the charge and discharge information is checked, so that the charge and discharge information used for the subsequent high-end calibration condition judgment can be valid information, thereby improving the accuracy of the high-end calibration condition judgment.

[0160] In some embodiments, a state of charge calibration method is provided, which is applied to a high-end state of charge calibration scenario of a power battery of a hybrid vehicle. In the hybrid vehicle, a battery management system BMS of the power battery communicates with a vehicle control system.

[0161] As shown in FIG. 7 , the method may include the following steps:

[0162] S701, obtaining the cumulative number of cycles of the charge and discharge capacity cycle recorded by the BMS.

[0163] The BMS will record the cumulative number of charge and discharge cycles of the power battery since the last state of charge calibration.

[0164] S702, determining whether the accumulated number of cycles reaches a preset number threshold.

[0165] S703, when the accumulated number of cycles is less than the preset number threshold, return to execute S701.

[0166] S704: When the accumulated number of cycles reaches a preset number threshold, determine the minimum displayed SOC upper limit of the power battery during the charging and discharging process.

[0167] Taking the cumulative number of cycles as 10 as an example, the BMS will obtain the displayed SOC upper limit during each power battery charging and discharging process in the 10 cycles, and select the minimum displayed SOC upper limit.

[0168] S705 , changing the mapping relationship between the displayed SOC and the real SOC to the real SOC (0-calibration value) and mapping to the displayed SOC (0-minimum displayed SOC upper limit).

[0169] It is understandable that since the cumulative charge and discharge capacity cycle has been exceeded and the SOC calibration has not been completed, the BMS will automatically process the displayed SOC towards a virtual low, that is, mapping the actual SOC (0-calibration value) to the displayed SOC (0-minimum displayed SOC upper limit).

[0170] S706, the BMS controls the charging and discharging of the power battery according to the changed mapping relationship.

[0171] S707, obtaining charging and discharging information of the power battery during the charging and discharging process.

[0172] Among them, the charging and discharging information includes the charging and discharging status, voltage, current, temperature and real-time SOC of the power battery.

[0173] S708: Determine whether the power battery meets the high-end calibration condition according to the charge and discharge information.

[0174] After collecting information such as the charge and discharge status, voltage, current, temperature, and real-time SOC of the power battery, the BMS can determine whether high-end calibration of the power battery can be performed based on the following conditions.

[0175] First, the charging and discharging state of the power battery is the recharging state.

[0176] Second, basic information such as voltage, current, and temperature of the power battery is valid.

[0177] Third, the voltage of the power battery, that is, the cell voltage exceeds the voltage threshold corresponding to the calibration value, where the voltage threshold is calibrated based on temperature. As the temperature rises, the calibrated voltage threshold decreases. For example, when the charging terminal temperature is 25°C, the voltage threshold is 3420mV, and the cell voltage of the power battery needs to be greater than 3420mV.

[0178] Fourth, the current of the power battery, that is, the recharge current is less than the current threshold corresponding to the temperature. Similarly, as the temperature rises, the corresponding current threshold decreases. For example, when the charging terminal temperature is 25°C, the current threshold is 0.2C, and the recharge current of the power battery needs to be less than 0.2C.

[0179] S709: When the power battery does not meet the high-end calibration condition, execute step S711.

[0180] S710: When the power battery meets the high-end correction requirement, the real-time SOC of the power battery is corrected to a calibration value.

[0181] When the BMS determines that the power battery meets the above four high-end calibration conditions, it performs the power battery SOC high-end calibration according to the following scheme: correcting the real-time SOC to the calibration value, where the calibration value is a calibrated value based on the high-end voltage of the battery cell.

[0182] S711, restore / maintain the mapping relationship between the displayed SOC and the real SOC such that the real SOC (0-100) is mapped to the displayed SOC (0-100), and clear the accumulated number of cycles.

[0183] It can be understood that the mapping relationship between the power battery SOC before and after high-end calibration is shown in Figure 8. Before calibration, the real SOC (0-calibration value) is mapped to the displayed SOC (0-BMS recorded minimum displayed SOC upper limit), and the real SOC (calibration value-100) is mapped to the displayed SOC (BMS recorded minimum displayed SOC upper limit-100), where the BMS recorded minimum displayed SOC upper limit is less than or equal to the calibration value. After calibration, the real SOC (0-100) is mapped to the displayed SOC (0-100), that is, full-range linear mapping.

[0184] In the above embodiment, the upper limit of SOC usage can be recorded and displayed according to the user's usage habits of the hybrid vehicle, and the SOC mapping relationship can be adjusted to allow the real SOC to obtain a high-end calibration opportunity. During the high-end calibration process, the SOC can be dynamically calibrated at the high end according to information such as voltage, current and temperature during the recharging process. While improving the accuracy of the state of charge calibration, it meets the state of charge calibration requirements in a wide range of usage scenarios.

[0185] It should be understood that, although the various steps in the flowcharts involved in the above-mentioned embodiments are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in sequence according to the order indicated by the arrows. Unless there is a clear explanation in this article, the execution of these steps does not have a strict order restriction, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above-mentioned embodiments can include multiple steps or multiple stages, and these steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a part of the steps or stages in other steps.

[0186] Based on the same inventive concept, the embodiment of the present application also provides a state of charge calibration device for implementing the state of charge calibration method involved above. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme recorded in the above method, so the specific limitations in one or more state of charge calibration device embodiments provided below can refer to the limitations of the state of charge calibration method above, and will not be repeated here.

[0187] In some embodiments, as shown in FIG. 9 , a state of charge calibration device 900 is provided, including: a charge calibration condition judgment module 901 , a relationship mapping module 902 and a high-end calibration module 903 , wherein:

[0188] The charge calibration condition determination module 901 is used to determine the usable charge state of the energy storage component during the charging and discharging process when the energy storage component of the hybrid device meets the charge calibration condition.

[0189] The relationship mapping module 902 is used to map the high-end calibration value of the energy storage component with the usable state of charge of the energy storage component to obtain the internal and external mapping relationship of the energy storage component.

[0190] The high-end calibration module 903 is used to control the energy storage component to charge and discharge according to the internal and external mapping relationship, and perform high-end calibration of the state of charge of the energy storage component.

[0191] In some embodiments, the state of charge calibration device further comprises:

[0192] The cumulative cycle number determination module is used to determine the cumulative cycle number of charge and discharge cycles performed by the energy storage component since the last charge state calibration.

[0193] The condition judgment module is used to determine whether the energy storage component meets the charge state calibration condition when the cumulative number of cycles reaches a preset number threshold.

[0194] In some embodiments, the charge calibration condition judgment module 901 is used to: obtain the charge and discharge cycle information of the energy storage component; determine, based on the charge and discharge cycle information, the upper limit values ​​of each state of charge obtained by the energy storage component when executing each charge and discharge cycle within the cumulative number of cycles; and determine the minimum upper limit value of each state of charge as the usable state of charge of the energy storage component during the charge and discharge process.

[0195] In some embodiments, the relationship mapping module 902 is used to: obtain the external usage range of the state of charge of the energy storage component, and the internal real range of the state of charge; map the usable state of charge in the external usage range of the state of charge with the high-end calibration value in the internal real range of the state of charge to obtain the internal and external mapping relationship of the energy storage component.

[0196] In some embodiments, the high-end calibration module 903 is used to: control the charging and discharging of the energy storage component according to the internal and external mapping relationship; obtain the charging and discharging information of the energy storage component during the charging and discharging process, and the charging and discharging information includes the real-time charge state of the energy storage component; when it is determined based on the charging and discharging information that the energy storage component meets the high-end calibration conditions, the real-time charge state of the energy storage component is corrected to the high-end calibration value.

[0197] In some embodiments, the charge and discharge information also includes the charge and discharge state of the energy storage component and the cell voltage. The charge state calibration device also includes:

[0198] The voltage threshold acquisition module is used to acquire the voltage threshold of the energy storage component when the charge and discharge state of the energy storage component is a recharge state, and the voltage threshold is determined according to the high-end calibration value.

[0199] The condition judgment module is used to determine whether the energy storage component meets the high-end calibration condition when the cell voltage of the energy storage component is greater than the voltage threshold.

[0200] In some embodiments, the charge and discharge information also includes the recharge current and temperature of the energy storage component. The condition judgment module is also used to: when the cell voltage of the energy storage component is greater than the voltage threshold, determine the current threshold of the energy storage component according to the temperature of the energy storage component; when the recharge current of the energy storage component is less than the current threshold, determine that the energy storage component meets the high-end calibration condition.

[0201] In some embodiments, the state of charge calibration device further comprises:

[0202] The effective condition acquisition module is used to acquire the charge and discharge parameter types corresponding to each information data contained in the charge and discharge information, and the effective conditions corresponding to each charge and discharge parameter type.

[0203] The validity check module is used to check the validity of each information data contained in the charge and discharge information based on each valid condition.

[0204] The condition judgment module is used to determine whether the energy storage component meets the high-end calibration condition based on the charge and discharge information when all information data meet the corresponding valid conditions.

[0205] Each module in the above-mentioned state of charge calibration device can be implemented in whole or in part by software, hardware, or a combination thereof. Each of the above-mentioned modules can be embedded in or independent of a processor in a computer device in the form of hardware, or can be stored in a memory in a computer device in the form of software, so that the processor can call and execute the operations corresponding to each of the above modules.

[0206] In some embodiments, a computer device is provided, which may be an energy storage management system, and its internal structure diagram may be as shown in FIG10. The computer device includes a processor, a memory, and a network interface connected via a system bus. Among them, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program, and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The database of the computer device is used to store data such as charge calibration conditions, usable charge states, high-end calibration values, and internal and external mapping relationships. The network interface of the computer device is used to communicate with an external terminal via a network connection. When the computer program is executed by the processor, a charge state calibration method is implemented.

[0207] Those skilled in the art will understand that the structure shown in FIG. 10 is merely a block diagram of a partial structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than shown in the figure, or combine certain components, or have a different arrangement of components.

[0208] In some embodiments, a computer device is provided, including a memory and a processor, wherein a computer program is stored in the memory, and when the processor executes the computer program, the specific steps of the above-mentioned state of charge calibration method embodiment are implemented.

[0209] In some embodiments, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the specific steps of the above-mentioned state of charge calibration method embodiment are implemented.

[0210] In some embodiments, a computer program product is provided, including a computer program, which implements the specific steps of the above-mentioned state of charge calibration method embodiment when executed by a processor.

[0211] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties. In addition, the acquisition, storage, processing, and transmission of data are in compliance with relevant laws and regulations.

[0212] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and 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-mentioned methods. Among them, any reference to the memory, database or other medium 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, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetoresistive random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The database involved in each embodiment provided in this application may include at least one of a relational database and a non-relational database. Non-relational databases may include distributed databases based on blockchains, etc., but are not limited to this. The processor involved in each embodiment provided in this application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., but are not limited to this.

[0213] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, 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.

[0214] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A method for calibrating a state of charge, characterized in that: The method comprises: When the energy storage component of the hybrid device meets the charge calibration condition, determining the usable charge state of the energy storage component during the charging and discharging process; Obtaining the external usage interval of the state of charge of the energy storage component and the internal real interval of the state of charge; the external usage interval of the state of charge refers to the usage interval of the energy storage component fed back by the energy storage management system to the whole machine control system of the hybrid device; the internal real interval of the state of charge refers to the interval composed of the real state of charge obtained by the energy storage management system when detecting the energy storage component; Mapping the usable state of charge in the state of charge external usage interval with the high-end calibration value in the state of charge internal real interval to obtain the internal and external mapping relationship of the energy storage component; Controlling the energy storage component to charge and discharge according to the internal and external mapping relationship; Acquiring charging and discharging information of the energy storage component during the charging and discharging process, wherein the charging and discharging information includes a real-time state of charge of the energy storage component; When it is determined based on the charge and discharge information that the energy storage component meets the high-end calibration conditions, the real-time state of charge of the energy storage component is corrected to the high-end calibration value; the high-end calibration value is obtained by calibrating the state of charge of the battery based on the high-end voltage of the battery cell of the energy storage component, and refers to the state value that the state of charge of the energy storage component needs to reach when the energy storage component performs high-end calibration of the state of charge; the high-end calibration of the state of charge refers to a calibration operation for calibrating the state of charge of the energy storage component when the charge and discharge voltage of the energy storage component is in the high-end voltage range.

2. The method according to claim 1, characterized in that: The method further comprises: Determining the cumulative number of charge and discharge cycles performed by the energy storage component since the last state of charge calibration; When the accumulated number of cycles reaches a preset number threshold, it is determined that the energy storage component meets the state of charge calibration condition.

3. The method according to claim 2, characterized in that Determining the usable state of charge of the energy storage component during the charging and discharging process includes: Obtaining charge and discharge cycle information of the energy storage component; Determine, according to the charge-discharge cycle information, upper limits of each state of charge obtained by the energy storage component when executing each charge-discharge cycle within the cumulative number of cycles; The minimum state of charge upper limit value among the state of charge upper limit values ​​is determined as the usable state of charge of the energy storage component during the charging and discharging process.

4. The method according to claim 1, characterized in that: The charging and discharging information also includes the charging and discharging state of the energy storage component and the cell voltage; the method also includes: When the charge-discharge state of the energy storage component is a recharging state, obtaining a voltage threshold of the energy storage component, wherein the voltage threshold is determined according to the high-end calibration value; When the cell voltage of the energy storage component is greater than the voltage threshold, it is determined that the energy storage component meets the high-end calibration condition.

5. The method according to claim 4, characterized in that The charge and discharge information also includes the recharge current and temperature of the energy storage component; when the cell voltage of the energy storage component is greater than the voltage threshold, determining that the energy storage component meets the high-end calibration condition includes: When the cell voltage of the energy storage component is greater than the voltage threshold, determining the current threshold of the energy storage component according to the temperature of the energy storage component; When the recharge current of the energy storage component is less than the current threshold, it is determined that the energy storage component meets the high-end calibration condition.

6. The method according to claim 1, characterized in that The method further comprises: Acquire the charge and discharge parameter types corresponding to each information data contained in the charge and discharge information, and the valid conditions corresponding to each charge and discharge parameter type; Performing validity check on each of the information data included in the charge and discharge information based on each of the validity conditions; In the case that each of the information data satisfies the corresponding validity conditions, it is determined whether the energy storage component meets the high-end calibration conditions based on the charge and discharge information.

7. A state of charge calibration device, characterized in that: The device comprises: A charge calibration condition judgment module, used to determine the usable charge state of the energy storage component during the charging and discharging process when the energy storage component of the hybrid device meets the charge calibration condition; A relationship mapping module is used to obtain the external usage interval of the state of charge of the energy storage component and the internal real interval of the state of charge; the external usage interval of the state of charge refers to the usage interval of the energy storage component fed back by the energy storage management system to the whole machine control system of the hybrid device; the internal real interval of the state of charge refers to the interval composed of the real state of charge obtained by the energy storage management system through detection of the energy storage component; the usable state of charge in the external usage interval of the state of charge is mapped with the high-end calibration value in the internal real interval of the state of charge to obtain the internal and external mapping relationship of the energy storage component; A high-end calibration module is used to control the energy storage component to charge and discharge according to the internal and external mapping relationship; obtain the charging and discharging information of the energy storage component during the charging and discharging process, and the charging and discharging information includes the real-time state of charge of the energy storage component; when it is determined that the energy storage component meets the high-end calibration conditions based on the charging and discharging information, the real-time state of charge of the energy storage component is corrected to the high-end calibration value; the high-end calibration value is obtained by calibrating the state of charge of the battery based on the high-end voltage of the battery cell of the energy storage component, and refers to the state value that the state of charge of the energy storage component needs to reach when the energy storage component performs high-end calibration of the state of charge; the high-end calibration of the state of charge refers to the calibration operation of calibrating the state of charge of the energy storage component when the charging and discharging voltage of the energy storage component is in the high-end voltage range.

8. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 6 are implemented.

9. 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.

10. A computer program product, comprising a computer program, 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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