A hybrid battery SOC adjustment method, device, equipment and medium

Abstract

This application provides a method, apparatus, device, and medium for adjusting the SOC of a hybrid battery, which are applied to adjusting the SOC window of a hybrid battery. The hybrid battery includes a first battery and a second battery, wherein the initial capacity of the first battery is greater than the initial capacity of the second battery, and the self-discharge rate of the first battery is greater than the self-discharge rate of the second battery. The adjustment method includes the following steps: obtaining the current capacity of the first battery; if the difference between the initial capacity of the first battery and the current capacity of the first battery is less than or equal to a first capacity threshold, determining the first SOC capacity of the hybrid battery based on the capacity of the second battery. This application can address the capacity shortcoming caused by differences in battery aging and self-discharge rates across different systems, and improve the charge and discharge performance of the hybrid battery system.

Description

Technical Field

[0001] The present application relates to the technical field of hybrid battery system management, and in particular to a method, device, equipment and storage medium for adjusting the SOC of a hybrid battery. Background Art

[0002] Hybrid battery systems use two or more different battery systems, such as ternary lithium batteries and lithium iron phosphate batteries. Ternary lithium batteries have high energy density and are the main choice in the industry. However, with the improvement of battery group technology, the energy density of lithium iron phosphate battery groups is gradually narrowing compared with ternary lithium batteries. Moreover, due to the higher safety and lower price of lithium iron phosphate batteries, they are being used by more and more car companies. However, lithium iron phosphate has the disadvantages of greater difficulty and poor accuracy in SOC estimation. Therefore, the industry currently uses ternary-lithium iron phosphate hybrid battery systems to make up for these shortcomings. The capacity loss caused by aging and self-discharge rate differences of batteries of different systems is completely different. During the charging and discharging process, one of the batteries will be overcharged or the other will be over-discharged. Therefore, batteries of different systems will cause capacity shortcomings in the hybrid battery system, limiting the charging and discharging performance of the hybrid battery system. Summary of the Invention

[0003] In view of this, the embodiments of the present application provide a hybrid battery SOC adjustment method, device, equipment and storage medium, which can solve the capacity shortcoming caused by battery aging and self-discharge rate differences in different systems, and improve the charge and discharge performance of the hybrid battery system.

[0004] In a first aspect, embodiments of the present application provide a method for adjusting the SOC of a hybrid battery, which is applied to adjusting the SOC window of the hybrid battery. The hybrid battery includes a first battery and a second battery, the initial capacity of the first battery is greater than the initial capacity of the second battery, and the self-discharge rate of the first battery is greater than the self-discharge rate of the second battery. The adjustment method includes the following steps:

[0005] Obtaining the current capacity of the first battery;

[0006] If the difference between the initial capacity of the first battery and the current capacity of the first battery is less than or equal to a first capacity threshold, determining a first SOC capacity of the hybrid battery based on the capacity of the second battery, and generating charging prompt information or discharging prompt information based on the first SOC capacity; the first capacity threshold is determined based on the initial capacity of the first battery and the initial capacity of the second battery;

[0007] If the difference between the initial capacity of the first battery and the current capacity of the first battery is greater than a first capacity threshold and less than or equal to a second capacity threshold, a second SOC capacity of the hybrid battery is determined based on the current capacity of the first battery, and charging prompt information or discharging prompt information is generated according to the second SOC capacity.

[0008] In a possible implementation, the first capacity threshold is determined based on the initial capacity of the first battery and the initial capacity of the second battery, including:

[0009] Obtaining an initial capacity difference according to the initial capacity of the first battery and the initial capacity of the second battery;

[0010] Based on the initial capacity difference, a first capacity threshold is determined; the first capacity threshold is less than or equal to the initial capacity difference.

[0011] In one possible implementation, the method further includes:

[0012] If the difference between the initial capacity of the first battery and the current capacity of the first battery is greater than a first capacity threshold and less than or equal to a second capacity threshold, the SOC window of the second battery is adjusted in real time until the percentage of the capacity represented by the SOC window of the second battery to the initial capacity of the second battery reaches a preset value.

[0013] In a possible implementation, the real-time adjustment of the SOC window of the second battery until a percentage of a capacity represented by the SOC window of the second battery to an initial capacity of the second battery reaches a preset value includes:

[0014] acquiring the real-time capacity of the first battery in real time and determining the capacity decay rate of the first battery;

[0015] Based on the capacity decay rate of the first battery, the SOC window of the second battery is adjusted so that the capacity represented by the SOC window of the second battery gradually decreases; the adjustment rate of the SOC window of the second battery is less than the capacity decay rate of the first battery.

[0016] In a possible implementation, determining the first SOC capacity of the hybrid battery based on the capacity of the second battery includes:

[0017] The initial capacity of the second battery is determined to be the SOC capacity of the hybrid battery.

[0018] In a possible implementation, determining the first SOC capacity of the hybrid battery based on the capacity of the second battery includes:

[0019] obtaining the real-time capacity of the second battery in real time;

[0020] Based on the real-time capacity of the second battery acquired in real time, the SOC capacity of the hybrid battery is updated in real time.

[0021] In one possible implementation, determining the second SOC capacity of the hybrid battery based on the current capacity of the first battery includes:

[0022] obtaining the real-time capacity of the first battery in real time;

[0023] Based on the real-time capacity of the first battery acquired in real time, the SOC capacity of the hybrid battery is updated in real time.

[0024] In a second aspect, an embodiment of the present application provides a hybrid battery SOC adjustment device, comprising:

[0025] an acquisition module, configured to acquire the current capacity of the first battery;

[0026] a first determining module, configured to determine a first SOC capacity of the hybrid battery based on the capacity of the second battery if a difference between the initial capacity of the first battery and the current capacity of the first battery is less than or equal to a first capacity threshold, and generate charging prompt information or discharging prompt information based on the first SOC capacity; the first capacity threshold being determined based on the initial capacity of the first battery and the initial capacity of the second battery;

[0027] a second determination module, configured to determine a second SOC capacity of the hybrid battery based on the current capacity of the first battery if a difference between the initial capacity of the first battery and the current capacity of the first battery is greater than a first capacity threshold and less than or equal to a second capacity threshold, and to generate charging prompt information or discharging prompt information according to the second SOC capacity.

[0028] In a third aspect, an embodiment of the present application provides a computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the steps of the hybrid battery SOC adjustment method described in any one of the first aspects are implemented.

[0029] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the steps of the hybrid battery SOC adjustment method described in any one of the first aspects are executed.

[0030] The technical solution provided in the embodiments of the present application has the following beneficial effects:

[0031] The method for adjusting the SOC of a hybrid battery provided in the present application first obtains the current capacity of the first battery having a larger initial capacity, and during use, monitors the capacity of the first battery in real time; if the difference between the initial capacity of the first battery and the current capacity of the first battery is less than or equal to a first capacity threshold, then at this stage, the capacity of the second battery is used as the first SOC capacity of the hybrid battery, and the charging prompt information or discharging prompt information of the hybrid battery during use at this stage is generated based on the first SOC capacity; if the difference between the initial capacity of the first battery and the current capacity of the first battery is greater than the first capacity threshold and less than or equal to the second capacity threshold, then at this stage, the capacity of the second battery is used as the first SOC capacity of the hybrid battery. The current capacity of the first battery is used as the second SOC capacity of the hybrid battery. The charging prompt information or discharging prompt information of the hybrid battery in this stage is generated based on the second SOC capacity until the end of the life cycle of the hybrid battery. In the initial stage of the hybrid battery, the SOC of the method is determined based on the capacity of the second battery with a smaller initial capacity, which can prevent overcharging and over-discharging of the second battery. The SOC in the mid-term stage is determined based on the capacity of the first battery with a faster decaying speed until the end of the life cycle of the hybrid battery, preventing overcharging and over-discharging of the first battery, solving the capacity shortcoming problem caused by the aging and self-discharge rate differences of batteries in different systems, improving the charging and discharging performance of the hybrid battery system, and extending the service life of the hybrid battery system.

[0032] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0034] Figure 1 A flow chart of a method for adjusting the SOC of a hybrid battery provided in an embodiment of the present application;

[0035] Figure 2 A flowchart of a method for determining a first capacity threshold provided in an embodiment of the present application;

[0036] Figure 3 A schematic diagram of a first capacity threshold provided in an embodiment of the present application;

[0037] Figure 4 A schematic diagram of the SOC window adjustment of the ternary lithium battery provided in an embodiment of the present application;

[0038] Figure 5 A schematic diagram of adjusting the SOC window of a lithium iron phosphate battery provided in an embodiment of the present application;

[0039] Figure 6 A schematic structural diagram of a hybrid battery SOC adjustment device provided in an embodiment of the present application;

[0040] Figure 7 A schematic diagram of the structure of a computer device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application for protection, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of this application.

[0042] In the following description, reference is made to “some embodiments”, which describes a subset of all possible embodiments, but it will be understood that “some embodiments” may be the same subset or different subsets of all possible embodiments and may be combined with each other without conflict.

[0043] In the prior art, when using a hybrid battery system, the following problems may occur:

[0044] Hybrid battery systems use two or more different battery systems, such as ternary lithium batteries and lithium iron phosphate batteries. Ternary lithium batteries have high energy density, while lithium iron phosphate batteries are safer and cheaper. However, lithium iron phosphate has the disadvantages of greater difficulty and poor accuracy in SOC estimation. Therefore, the industry currently uses ternary-lithium iron phosphate hybrid battery systems to make up for these shortcomings. However, the capacity loss caused by aging and self-discharge rate differences in batteries of different systems is completely different. During the charging and discharging process, one of the batteries will be overcharged or the other will be over-discharged. Therefore, hybrid batteries of different systems will cause capacity shortcomings in the hybrid battery system, limiting the charging and discharging performance of the hybrid battery system.

[0045] Based on the above-mentioned defects, an embodiment of the present application provides a hybrid battery SOC adjustment method, which is applied to the adjustment of the hybrid battery SOC window, wherein the hybrid battery includes a first battery and a second battery, the initial capacity of the first battery is greater than the initial capacity of the second battery, and the self-discharge rate of the first battery is greater than the self-discharge rate of the second battery, such as Figure 1 As shown, the following steps are included:

[0046] S101, obtaining the current capacity of the first battery;

[0047] S102, if the difference between the initial capacity of the first battery and the current capacity of the first battery is less than or equal to a first capacity threshold, determining a first state of charge (SOC) capacity of the hybrid battery based on the capacity of the second battery, and generating charging prompt information or discharging prompt information based on the first SOC capacity; the first capacity threshold is determined based on the initial capacity of the first battery and the initial capacity of the second battery;

[0048] S103, if the difference between the initial capacity of the first battery and the current capacity of the first battery is greater than a first capacity threshold and less than or equal to a second capacity threshold, determine a second SOC capacity of the hybrid battery based on the current capacity of the first battery, and generate charging prompt information or discharging prompt information according to the second SOC capacity.

[0049] The above exemplary steps of the embodiment of the present application are described below respectively; in this embodiment, the first battery is a ternary lithium battery as an example, and the second battery is a lithium iron phosphate battery as an example.

[0050] In step S101, the current capacity of the first battery is obtained;

[0051] Specifically, the current capacity of the first battery is the capacity of the first battery corresponding to the acquisition moment when the first battery capacity is acquired during use of the first battery, that is, in this embodiment, the current capacity of the ternary lithium battery is acquired.

[0052] In step S102, if the difference between the initial capacity of the first battery and the current capacity of the first battery is less than or equal to a first capacity threshold, a first state of charge (SOC) capacity of the hybrid battery is determined based on the capacity of the second battery, and charging prompt information or discharging prompt information is generated based on the first SOC capacity; the first capacity threshold is determined based on the initial capacity of the first battery and the initial capacity of the second battery;

[0053] Specifically, after obtaining the current capacity of the first battery, it is determined whether the difference between the initial capacity and the current capacity of the first battery is less than or equal to the first capacity threshold in the first battery. If it is less than or equal to the first capacity threshold, it indicates that the attenuation capacity of the first battery is less than or equal to the first capacity threshold. Before the attenuation capacity reaches the first capacity threshold, the capacity of the first battery is always greater than the capacity of the second battery. The capacity of the second battery is used as the first SOC capacity of the hybrid battery to prevent over-discharge of the second battery.

[0054] In step S103, if the difference between the initial capacity of the first battery and the current capacity of the first battery is greater than a first capacity threshold and less than or equal to a second capacity threshold, determining a second SOC capacity of the hybrid battery based on the current capacity of the first battery, and generating charging prompt information or discharging prompt information according to the second SOC capacity;

[0055] Specifically, the second capacity threshold may be the total capacity of the first battery at the end of its life cycle, that is, the difference between the initial capacity of the first battery and the current capacity of the first battery is less than or equal to the second capacity threshold, indicating that the first battery is still in use and its life cycle has not ended; if the difference between the initial capacity and the current capacity of the first battery is greater than the first capacity threshold and less than or equal to the second capacity threshold, it indicates that the attenuated capacity of the first battery is greater than the first capacity threshold. After the attenuated capacity reaches the first capacity threshold, the capacity of the first battery is used as the first SOC capacity of the hybrid battery to prevent over-discharge of the first battery.

[0056] In another embodiment, if the difference between the initial capacity of the first battery and the current capacity of the first battery is greater than a second capacity threshold, the life cycle of the hybrid battery ends and a battery replacement prompt message is generated.

[0057] Specifically, when the difference between the initial capacity of the first battery and the current capacity of the first battery is greater than a second capacity threshold, it indicates that the capacity of the first battery no longer meets the usage requirements, its life cycle has ended, and the first battery needs to be replaced.

[0058] The above-mentioned method for adjusting the SOC of the hybrid battery first obtains the current capacity of the first battery with a larger initial capacity. During use, the capacity of the first battery is monitored in real time. If the difference between the initial capacity of the first battery and the current capacity of the first battery is less than or equal to a first capacity threshold, then at this stage, the capacity of the second battery is used as the first SOC capacity of the hybrid battery. The charging prompt information or discharging prompt information of the hybrid battery during use at this stage is generated based on the first SOC capacity. If the difference between the initial capacity of the first battery and the current capacity of the first battery is greater than the first capacity threshold and less than or equal to the second capacity threshold, then at this stage, the first battery is used as the first SOC capacity of the hybrid battery. The current capacity of the battery is used as the second SOC capacity of the hybrid battery. The charging prompt information or discharging prompt information of the hybrid battery in this stage is generated based on the second SOC capacity until the end of the life cycle of the hybrid battery. The SOC of the hybrid battery in the initial stage is determined based on the capacity of the second battery with a smaller initial capacity, which can prevent overcharging and over-discharging of the second battery. The SOC in the mid-term stage is determined based on the capacity of the first battery with a faster decay until the end of the life cycle of the hybrid battery, preventing overcharging and over-discharging of the first battery, solving the capacity shortcoming problem caused by the aging and self-discharge rate differences of batteries in different systems, improving the charging and discharging performance of the hybrid battery system, and extending the service life of the hybrid battery system.

[0059] In some embodiments, when determining the size of the first capacity threshold, it is necessary to determine it based on the initial capacity of the first battery and the initial capacity of the second battery. Specifically, Figure 2 As shown, step S102 includes the following steps:

[0060] S201, obtaining an initial capacity difference based on the initial capacity of the first battery and the initial capacity of the second battery;

[0061] S202: Determine a first capacity threshold based on the initial capacity difference; the first capacity threshold is less than or equal to the initial capacity difference;

[0062] Specifically, since the initial capacity of the first battery is greater than the initial capacity of the second battery, it is necessary to set a first capacity threshold as a standard. When the attenuation capacity of the first battery is less than or equal to the first capacity threshold, the capacity of the second battery is used as the SOC capacity of the hybrid battery. When the attenuation capacity of the first battery is greater than the first capacity threshold, the capacity of the first battery is used as the SOC capacity of the hybrid battery, thereby preventing overcharging or over-discharging of the battery with smaller capacity.

[0063] In some embodiments, since the initial capacity of the ternary lithium battery is greater than the initial capacity of the lithium iron phosphate battery, a first capacity threshold is set within the initial capacity of the ternary lithium battery. For example, the first capacity threshold may be 5% of the initial capacity of the ternary lithium battery. Figure 3 As shown in the figure, the SOC window of the lithium iron phosphate battery completely overlaps with the PACK window, that is, the first SOC capacity of the hybrid battery is based on the capacity of the lithium iron phosphate battery, the measured capacity of the lithium iron phosphate battery is used as the capacity of the hybrid battery, and the initial capacity of the lithium iron phosphate is fed back to the SOC capacity of the hybrid battery. Since the actual capacity of the ternary lithium battery is greater than the actual capacity of the lithium iron phosphate at the beginning, in order to prevent overcharging or over-discharging, a part of the capacity needs to be reserved. Figure 3 For example, when discharging, the remaining capacity of the ternary lithium battery is controlled to be more than 5% of the current total capacity. When charging, the capacity of the ternary lithium battery is controlled to be less than 95% of the current total capacity. The capacity of the ternary lithium battery except for this reserved part is used as the capacity of the ternary lithium battery, and after proportional conversion, it is fed back to the SOC capacity of the ternary lithium battery. This not only improves the service life of the ternary lithium battery, but also improves the safety of the hybrid battery.

[0064] When the hybrid battery enters the use stage, since the capacity attenuation of the lithium iron phosphate battery is very small, the initial capacity of the lithium iron phosphate can be fed back to the SOC capacity of the hybrid battery, or the capacity of the lithium iron phosphate detected in real time can be proportionally converted and fed back to the SOC capacity of the hybrid battery until the attenuation capacity of the ternary lithium battery reaches the first capacity threshold. At this stage, due to the continuous attenuation of the ternary lithium battery, the actual capacity will gradually decrease, and the reserved charge and discharge capacity of the ternary lithium battery needs to be gradually adjusted, such as Figure 4 As shown in the figure, the blank part of the left dashed line is the attenuated capacity. At this time, the remaining capacity ( Figure 4 0%-100%) is used as the total capacity of the ternary lithium battery. At this time, it is still greater than the actual capacity of the lithium iron phosphate. Therefore, in order to prevent overcharge or over-discharge of the hybrid battery, a part of the capacity needs to be reserved. At this time, the reserved capacity is 5% of the current total capacity. The capacity of the ternary lithium battery other than this part of the reserved capacity is used as the real-time capacity of the ternary lithium battery, that is, Figure 4 The 0%-95% capacity of the ternary lithium battery, at this time, the attenuation capacity of the ternary lithium battery reaches the first capacity threshold, and the real-time capacity (0%-95%) of the ternary lithium battery is proportionally converted and fed back to the SOC capacity of the hybrid battery; in the subsequent continuous attenuation of the ternary lithium battery, in order to prevent overcharge and over-discharge, the reserved capacity is adjusted in real time according to the real-time capacity of the ternary lithium battery, and the reserved capacity is controlled at 5% of the real-time capacity (in other embodiments, it can also be other values), and the remaining 95% of the real-time capacity is converted into the SOC capacity of the hybrid battery until the end of the life cycle of the hybrid battery.

[0065] During the charging and discharging process, the ternary lithium battery should not be emptied or fully charged. Figure 4 As shown, discharging will control the SOC of the ternary lithium battery to above 5%, and charging will be controlled below 95%, because charging over 95% has a greater impact on the life of the ternary lithium battery and also poses a safety risk.

[0066] In some embodiments, the adjustment method further includes:

[0067] If the difference between the initial capacity of the first battery and the current capacity of the first battery is greater than a first capacity threshold and less than or equal to a second capacity threshold, the SOC window of the second battery is adjusted in real time until the percentage of the capacity represented by the SOC window of the second battery to the initial capacity of the second battery reaches a preset value.

[0068] Specifically, when the difference between the initial capacity of the first battery and the current capacity of the first battery is greater than the first capacity threshold, the capacity of the ternary lithium battery will continue to decay. At this time, the SOC window of the ternary lithium battery will no longer be adjusted. In order to prevent the ternary lithium battery from being scrapped due to over-discharge, the SOC window of the lithium iron phosphate battery is adjusted in real time, such as Figure 5 As shown, until the percentage of the capacity represented by the SOC window of the second battery to the initial capacity of the second battery reaches a preset value, the preset value can be set to 90%.

[0069] In some embodiments, the real-time adjustment of the SOC window of the second battery until the percentage of the capacity represented by the SOC window of the second battery to the initial capacity of the second battery reaches a preset value includes:

[0070] acquiring the real-time capacity of the first battery in real time and determining the capacity decay rate of the first battery;

[0071] Based on the capacity decay rate of the first battery, the SOC window of the second battery is adjusted so that the capacity represented by the SOC window of the second battery gradually decreases; the adjustment rate of the SOC window of the second battery is less than the capacity decay rate of the first battery.

[0072] Specifically, when the capacity of the first battery, i.e., the ternary lithium battery in this embodiment, continues to decay, the hybrid battery has a short board capacity, so it is necessary to adjust the SOC window of the lithium iron phosphate battery so that the capacity represented by the window gradually decreases, such as Figure 5 As shown, the blank dotted portion on the left side of the ternary lithium battery is the capacity that has decayed at this time, and the dotted portion on the left side of the lithium iron phosphate battery is the default decayed capacity, that is, the remaining capacity of the lithium iron phosphate ( Figure 510%-100%) as the real-time capacity of lithium iron phosphate and proportionally converted into the SOC capacity of lithium iron phosphate, by Figure 5 It can also be seen that the ternary lithium battery continues to decay (the SOC window of the ternary lithium battery is no longer adjusted during this process), and the remaining capacity is still greater than the capacity of the lithium iron phosphate battery. In order to achieve a better capacity balance between the two batteries, the rate of adjusting the SOC window of the lithium iron phosphate is less than the capacity decay rate of the ternary lithium battery.

[0073] In some embodiments, determining the first SOC capacity of the hybrid battery based on the capacity of the second battery includes:

[0074] The initial capacity of the second battery is determined to be the SOC capacity of the hybrid battery.

[0075] In this embodiment, since the attenuation rate of the lithium iron phosphate battery is very slow, for the convenience of calculation, the attenuation of the lithium iron phosphate is ignored. When the attenuation capacity of the ternary lithium battery is less than or equal to the first capacity threshold, the initial capacity of the lithium iron phosphate is used as the SOC capacity of the hybrid battery.

[0076] In some embodiments, determining the first SOC capacity of the hybrid battery based on the capacity of the second battery includes:

[0077] obtaining the real-time capacity of the second battery in real time;

[0078] Based on the real-time capacity of the second battery acquired in real time, the SOC capacity of the hybrid battery is updated in real time.

[0079] In this embodiment, when the real-time capacity of the second battery is obtained, the capacity obtained in real time is used as the real-time capacity of the hybrid battery, and a proportional conversion is performed to obtain the real-time SOC capacity of the hybrid battery. The real-time capacity of the second battery is used as the real-time capacity of the hybrid battery, and the real-time capacity of the second battery is used as the standard during charging and discharging, so that the SOC capacity of the hybrid battery is more accurate.

[0080] In some embodiments, determining the second SOC capacity of the hybrid battery based on the current capacity of the first battery includes:

[0081] obtaining the real-time capacity of the first battery in real time;

[0082] Based on the real-time capacity of the first battery acquired in real time, the SOC capacity of the hybrid battery is updated in real time.

[0083] Specifically, when the real-time capacity of the first battery is obtained, the real-time capacity obtained is used as the real-time capacity of the hybrid battery, and a proportional conversion is performed to obtain the real-time SOC capacity of the hybrid battery.

[0084] In summary, the embodiments of the present application have the following beneficial effects:

[0085] First, the current capacity of the first battery with a larger initial capacity is obtained. During use, the capacity of the first battery is monitored in real time. If the difference between the initial capacity of the first battery and the current capacity of the first battery is less than or equal to a first capacity threshold, then at this stage, the capacity of the second battery is used as the first SOC capacity of the hybrid battery. The charging prompt information or discharging prompt information of the hybrid battery during use at this stage is generated based on the first SOC capacity. If the difference between the initial capacity of the first battery and the current capacity of the first battery is greater than the first capacity threshold and less than or equal to the second capacity threshold, then at this stage, the current capacity of the first battery is used as is the second SOC capacity of the hybrid battery. The charging prompt information or discharging prompt information of the hybrid battery in this stage is generated according to the second SOC capacity until the end of the life cycle of the hybrid battery. The SOC of the hybrid battery in the initial stage of this method is determined according to the capacity of the second battery with a smaller initial capacity, which can prevent overcharging and over-discharging of the second battery. The SOC in the mid-term stage is determined according to the capacity of the first battery with a faster decay until the end of the life cycle of the hybrid battery, preventing overcharging and over-discharging of the first battery, solving the capacity shortcoming problem caused by aging and self-discharge rate differences of batteries in different systems, improving the charging and discharging performance of the hybrid battery system, and extending the service life of the hybrid battery system.

[0086] Based on the same inventive concept, an embodiment of the present application also provides a hybrid battery SOC adjustment device corresponding to the hybrid battery SOC adjustment method in the first embodiment. Since the principle of solving the problem by the device in the embodiment of the present application is similar to the above-mentioned hybrid battery SOC adjustment method, the implementation of the device can refer to the implementation of the method, and the repeated parts will not be repeated.

[0087] like Figure 6 As shown, Figure 6 This is a schematic diagram of the structure of a hybrid battery SOC adjustment device provided in this application. The hybrid battery SOC adjustment device is applied to adjust the hybrid battery SOC window. The hybrid battery includes a first battery and a second battery. The initial capacity of the first battery is greater than the initial capacity of the second battery. The self-discharge rate of the first battery is greater than the self-discharge rate of the second battery. The adjustment device includes:

[0088] An acquisition module 601 is configured to acquire the current capacity of the first battery;

[0089] a first determining module 602 configured to determine a first SOC capacity of the hybrid battery based on the capacity of the second battery if a difference between the initial capacity of the first battery and the current capacity of the first battery is less than or equal to a first capacity threshold, and generate charging prompt information or discharging prompt information based on the first SOC capacity; the first capacity threshold being determined based on the initial capacity of the first battery and the initial capacity of the second battery;

[0090] The second determination module 603 is configured to determine a second SOC capacity of the hybrid battery based on the current capacity of the first battery if the difference between the initial capacity of the first battery and the current capacity of the first battery is greater than a first capacity threshold and less than or equal to a second capacity threshold, and generate charging prompt information or discharging prompt information according to the second SOC capacity.

[0091] In another embodiment, the adjustment device further includes a generation module 604 for generating a battery replacement prompt message if the difference between the initial capacity of the first battery and the current capacity of the first battery is greater than a second capacity threshold, indicating that the life cycle of the hybrid battery ends.

[0092] It should be understood by those skilled in the art that Figure 6 The functions implemented by each module in the hybrid battery SOC adjustment device shown can be understood by referring to the related description of the hybrid battery SOC adjustment method described above. Figure 6 The functions of the various units in the hybrid battery SOC adjustment device shown may be implemented by a program running on a processor, or may be implemented by a specific logic circuit.

[0093] In a possible implementation, the first determining module 602 includes:

[0094] a calculation unit, configured to obtain an initial capacity difference according to the initial capacity of the first battery and the initial capacity of the second battery;

[0095] A determining unit is configured to determine the first capacity threshold based on the initial capacity difference; the first capacity threshold is less than or equal to the initial capacity difference.

[0096] In a possible implementation, the device further includes:

[0097] an adjustment module, configured to adjust the SOC window of the second battery in real time if the difference between the initial capacity of the first battery and the current capacity of the first battery is greater than a first capacity threshold and less than or equal to a second capacity threshold, until the percentage of the capacity represented by the SOC window of the second battery to the initial capacity of the second battery reaches a preset value.

[0098] In a possible implementation, the adjustment module is further configured to:

[0099] acquiring the real-time capacity of the first battery in real time and determining the capacity decay rate of the first battery;

[0100] Based on the capacity decay rate of the first battery, the SOC window of the second battery is adjusted so that the capacity represented by the SOC window of the second battery gradually decreases; the adjustment rate of the SOC window of the second battery is less than the capacity decay rate of the first battery.

[0101] In a possible implementation, the first determining module 602 includes:

[0102] Used to determine the initial capacity of the second battery as the SOC capacity of the hybrid battery.

[0103] In a possible implementation, the first determining module 602 includes:

[0104] Used to obtain the real-time capacity of the second battery in real time;

[0105] Used to update the SOC capacity of the hybrid battery in real time based on the real-time capacity of the second battery obtained in real time.

[0106] In a possible implementation, the second determining module 603 includes:

[0107] obtaining the real-time capacity of the first battery in real time;

[0108] Based on the real-time capacity of the first battery acquired in real time, the SOC capacity of the hybrid battery is updated in real time.

[0109] The above-mentioned hybrid battery SOC adjustment device first obtains the current capacity of the first battery with a larger initial capacity through the acquisition module 601. During use, the capacity of the first battery is monitored in real time. If the difference between the initial capacity of the first battery and the current capacity of the first battery is less than or equal to the first capacity threshold, then at this stage, the capacity of the second battery is used as the first SOC capacity of the hybrid battery through the first determination module 602. The charging prompt information or discharging prompt information of the hybrid battery during use at this stage is generated based on the first SOC capacity. If the difference between the initial capacity of the first battery and the current capacity of the first battery is greater than the first capacity threshold and less than or equal to the second capacity threshold, then at this stage, the second determination module 603 is used to determine the first battery capacity. , the current capacity of the first battery is used as the second SOC capacity of the hybrid battery, and the charging prompt information or discharging prompt information of the hybrid battery in this stage is generated based on the second SOC capacity until the life cycle of the hybrid battery ends, and the battery replacement prompt information is generated through the generation module 604. In the initial stage of the hybrid battery, the SOC of the hybrid battery is determined based on the capacity of the second battery with a smaller initial capacity, which can prevent overcharging and over-discharging of the second battery. In the middle stage, the SOC is determined based on the capacity of the first battery with a faster attenuation until the life cycle of the hybrid battery ends, preventing overcharging and over-discharging of the first battery, solving the capacity shortcoming caused by the aging and self-discharge rate differences of batteries in different systems, improving the charging and discharging performance of the hybrid battery system, and extending the service life of the hybrid battery system.

[0110] Corresponding to Figure 1 The embodiment of the present application further provides a computer device 700, such as Figure 7 As shown, the device includes a memory 701, a processor 702, and a computer program stored in the memory 701 and executable on the processor 702, wherein the processor 702 implements the hybrid battery SOC adjustment method when executing the computer program.

[0111] Specifically, the above-mentioned memory 701 and processor 702 can be general-purpose memories and processors, which are not specifically limited here. When the processor 702 runs the computer program stored in the memory 701, it can execute the above-mentioned hybrid battery SOC adjustment method, which solves the capacity shortage problem caused by the aging and self-discharge rate differences of batteries of different systems in the prior art.

[0112] Corresponding to Figure 1 The embodiment of the present application further provides a computer-readable storage medium having a computer program stored thereon, which executes the steps of the hybrid battery SOC adjustment method when the computer program is executed by a processor.

[0113] Specifically, the storage medium can be a general storage medium, such as a mobile disk, hard disk, etc. When the computer program on the storage medium is run, it can execute the above-mentioned hybrid battery SOC adjustment method, solving the capacity shortage problem caused by aging and self-discharge rate differences of batteries of different systems in the prior art.

[0114] The computer-readable storage medium first obtains the current capacity of the first battery having a larger initial capacity, and monitors the capacity of the first battery in real time during use. If the difference between the initial capacity of the first battery and the current capacity of the first battery is less than or equal to a first capacity threshold, then at this stage, the capacity of the second battery is used as the first SOC capacity of the hybrid battery, and the charging prompt information or discharging prompt information of the hybrid battery during use at this stage is generated based on the first SOC capacity. If the difference between the initial capacity of the first battery and the current capacity of the first battery is greater than the first capacity threshold and less than or equal to the second capacity threshold, then at this stage, the capacity of the first battery is used as the first SOC capacity of the hybrid battery. The current capacity is used as the second SOC capacity of the hybrid battery. The charging prompt information or discharge prompt information of the hybrid battery in this stage is generated according to the second SOC capacity until the end of the life cycle of the hybrid battery. The SOC of the hybrid battery in the initial stage of this method is determined according to the capacity of the second battery with a smaller initial capacity, which can prevent overcharging and over-discharging of the second battery. The SOC in the mid-term stage is determined according to the capacity of the first battery with a faster decay until the end of the life cycle of the hybrid battery, preventing overcharging and over-discharging of the first battery, solving the capacity shortcoming problem caused by aging and self-discharge rate differences of batteries in different systems, improving the charging and discharging performance of the hybrid battery system, and extending the service life of the hybrid battery system.

[0115] In the embodiments provided in this application, it should be understood that the disclosed methods and devices can be implemented in other ways. The device embodiments described above are merely schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some communication interface, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0116] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0117] In addition, each functional unit in the embodiments provided in the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0118] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0119] It should be noted that similar numbers and letters represent similar items in the following figures. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description and are not to be understood as indicating or implying relative importance.

[0120] It should be noted that the term "comprising" used in the embodiments of the present application is used to indicate the existence of the features declared thereafter, but does not exclude the addition of other features.

[0121] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs. The terms used herein are for the purpose of describing the embodiments of this application and are not intended to limit this application.

[0122] Finally, it should be noted that the above-described embodiments are only specific implementation methods of the present application, which are used to illustrate the technical solutions of the present application, rather than to limit them. The scope of protection of the present application is not limited thereto. Although the present application has been described in detail with reference to the above-described embodiments, those skilled in the art should understand that any person skilled in the art can modify or easily conceive of changes to the technical solutions described in the above-described embodiments within the technical scope disclosed in the present application, or perform equivalent replacements for some of the technical features thereof. However, these modifications, changes, or replacements do not deviate from the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application. They should all be included in the scope of protection of the present application. Therefore, the scope of protection of the present application shall be subject to the scope of protection of the claims.

Claims

1. A method for adjusting the SOC of a hybrid battery, applied to adjusting the SOC window of a hybrid battery, wherein the hybrid battery comprises a first battery and a second battery, characterized in that: The initial capacity of the first battery is greater than the initial capacity of the second battery, the self-discharge rate of the first battery is greater than the self-discharge rate of the second battery, and the adjustment method includes the following steps: Obtaining the current capacity of the first battery; If the difference between the initial capacity of the first battery and the current capacity of the first battery is less than or equal to a first capacity threshold, the first SOC capacity of the hybrid battery is determined based on the capacity of the second battery, and charging prompt information or discharging prompt information is generated according to the first SOC capacity; the first capacity threshold is determined based on the initial capacity of the first battery and the initial capacity of the second battery; the first capacity threshold is determined based on the initial capacity of the first battery and the initial capacity of the second battery, including: obtaining an initial capacity difference according to the initial capacity of the first battery and the initial capacity of the second battery; determining the first capacity threshold based on the initial capacity difference; the first capacity threshold is less than or equal to the initial capacity difference; the second capacity threshold is a total capacity decay of the first battery at the end of its life cycle; If the difference between the initial capacity of the first battery and the current capacity of the first battery is greater than a first capacity threshold and less than or equal to a second capacity threshold, a second SOC capacity of the hybrid battery is determined based on the current capacity of the first battery, and charging prompt information or discharging prompt information is generated according to the second SOC capacity.

2. The method for adjusting the SOC of a hybrid battery according to claim 1, characterized in that: The method further comprises: If the difference between the initial capacity of the first battery and the current capacity of the first battery is greater than a first capacity threshold and less than or equal to a second capacity threshold, the SOC window of the second battery is adjusted in real time until the percentage of the capacity represented by the SOC window of the second battery to the initial capacity of the second battery reaches a preset value.

3. The method for adjusting the SOC of a hybrid battery according to claim 2, characterized in that: The real-time adjustment of the SOC window of the second battery until a percentage of a capacity represented by the SOC window of the second battery to an initial capacity of the second battery reaches a preset value includes: acquiring the real-time capacity of the first battery in real time and determining the capacity decay rate of the first battery; Based on the capacity decay rate of the first battery, the SOC window of the second battery is adjusted so that the capacity represented by the SOC window of the second battery gradually decreases; the adjustment rate of the SOC window of the second battery is less than the capacity decay rate of the first battery.

4. The method for adjusting the SOC of a hybrid battery according to claim 1, characterized in that: The determining the first SOC capacity of the hybrid battery based on the capacity of the second battery includes: The initial capacity of the second battery is determined to be the SOC capacity of the hybrid battery.

5. The method for adjusting the SOC of a hybrid battery according to claim 1, characterized in that: The determining the first SOC capacity of the hybrid battery based on the capacity of the second battery includes: obtaining the real-time capacity of the second battery in real time; Based on the real-time capacity of the second battery acquired in real time, the SOC capacity of the hybrid battery is updated in real time.

6. The method for adjusting the SOC of a hybrid battery according to claim 1, characterized in that: The determining the second SOC capacity of the hybrid battery based on the current capacity of the first battery includes: obtaining the real-time capacity of the first battery in real time; Based on the real-time capacity of the first battery acquired in real time, the SOC capacity of the hybrid battery is updated in real time.

7. A hybrid battery SOC adjustment device, used for adjusting the SOC window of a hybrid battery, wherein the hybrid battery comprises a first battery and a second battery, characterized in that: The initial capacity of the first battery is greater than the initial capacity of the second battery, the self-discharge rate of the first battery is greater than the self-discharge rate of the second battery, and the adjustment device includes: an acquisition module, configured to acquire the current capacity of the first battery; a first determination module configured to determine a first SOC capacity of the hybrid battery based on the capacity of the second battery, and generate charging prompt information or discharging prompt information based on the first SOC capacity, if a difference between the initial capacity of the first battery and the current capacity of the first battery is less than or equal to a first capacity threshold; the first capacity threshold being determined based on the initial capacity of the first battery and the initial capacity of the second battery; the first determination module comprising: obtaining an initial capacity difference based on the initial capacity of the first battery and the initial capacity of the second battery; determining the first capacity threshold based on the initial capacity difference; the first capacity threshold being less than or equal to the initial capacity difference; and the second capacity threshold being a total capacity decay of the first battery at the end of its life cycle; a second determination module, configured to determine a second SOC capacity of the hybrid battery based on the current capacity of the first battery if a difference between the initial capacity of the first battery and the current capacity of the first battery is greater than a first capacity threshold and less than or equal to a second capacity threshold, and to generate charging prompt information or discharging prompt information according to the second SOC capacity.

8. A computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, 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 executed.

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