A battery system, a method for estimating an SOC thereof, and a computer device and medium

Abstract

This disclosure provides a battery system, a method for estimating its SOC, and a computer device and medium. The method is characterized by: mapping an upper and lower limit of the state of charge (SOC) of a second battery system to a SOC range of the battery system to establish a mapping relationship between the upper and lower limits of the SOC of the second battery system and the SOC range of the battery system; and calculating the SOC of the second battery system and estimating the SOC of the battery system based on the mapping relationship.

Description

Technical Field

[0001] This invention relates to the field of vehicle battery technology, and more specifically to a battery system comprising a dual-battery system, a method for estimating the state of charge (SOC) of said battery system, and a computer device and medium. Background Technology

[0002] With the rapid development and widespread adoption of electric vehicles, users are placing increasingly higher demands on battery safety performance. Currently, the power batteries used in electric vehicles are mainly divided into lithium iron phosphate (LFP) batteries and ternary lithium batteries (NCM). Due to the superior safety performance of LFP batteries, more and more electric vehicles are adopting LFP batteries in recent years.

[0003] Estimating the state of charge (SOC) of a vehicle battery is a core issue in a battery management system (BMS). Accurate SOC estimation helps the vehicle formulate appropriate control strategies, thereby extending battery life and reducing range anxiety for users. Commonly used SOC estimation methods fall into two categories: those based on current integration plus open-circuit voltage (OCV) calibration, and those based on battery models. These methods all require determining the battery's open-circuit voltage and mapping it to the SOC based on offline experimental results. These methods require a steep slope in the battery's OCV-SOC curve to accurately map the open-circuit voltage to the SOC after acquisition.

[0004] like Figure 1 As shown, the OCV-SOC curve of lithium iron phosphate (LFP) batteries is unusually flat, meaning that a given open-circuit voltage (OCV) can typically be mapped to a wide range of SOC values. This makes it difficult to accurately estimate the SOC of LFP batteries. Estimating the SOC of LFP batteries remains a challenging problem in the industry. Summary of the Invention

[0005] This invention was made to solve one or more of the above-mentioned problems, or other problems, and the technical solution adopted is as follows.

[0006] According to one aspect of the present invention, a method for estimating the state of charge (SOC) of a battery system is provided, characterized in that the battery system includes a first battery system and a second battery system, and the method includes: mapping an upper limit and a lower limit of the SOC of the second battery system to a SOC range of the battery system to establish a mapping relationship between the upper limit and the lower limit of the SOC of the second battery system and the SOC range of the battery system; and calculating the SOC of the second battery system and estimating the SOC of the battery system based on the mapping relationship.

[0007] Furthermore, according to one aspect of the present invention, the method further includes: dynamically adjusting the state of charge range of the first battery system and the state of charge range of the second battery system, such that the state of charge of the second battery system always accurately reflects the state of charge of the battery system.

[0008] Furthermore, according to one aspect of the invention, the dynamic adjustment includes: setting the lower limit of the state of charge of the first system battery to be lower than the lower limit of the state of charge of the second system battery, and setting the upper limit of the state of charge of the second system battery to be higher than the upper limit of the state of charge of the first system battery.

[0009] Furthermore, according to one aspect of the invention, the dynamic adjustment further includes: opening the lower limit of the state of charge of the first system battery and supplementing the opened lower limit to the state of charge range of the second system battery.

[0010] Furthermore, according to one aspect of the invention, the dynamic adjustment further includes: reducing the upper limit of the state of charge of the second system battery and supplementing the reduced upper limit to the range of the first system battery.

[0011] Furthermore, according to one aspect of the invention, the dynamic adjustment further includes: opening the upper limit of the state of charge of the second system battery and supplementing the opened upper limit to the state of charge range of the second system battery.

[0012] Furthermore, in one aspect of the present invention, the first battery system is a lithium iron phosphate battery system, and the second battery system is a ternary battery system.

[0013] According to another aspect of the present invention, a battery system is provided, the battery system comprising a first battery cell and a second battery cell, wherein the state of charge (SOC) of the battery system is estimated by the following steps: mapping an upper limit and a lower limit of the SOC of the second battery cell to a SOC range of the battery system to establish a mapping relationship between the upper limit and the lower limit of the SOC of the second battery cell and the SOC range of the battery system; and calculating the SOC of the second battery cell and estimating the SOC of the battery system based on the mapping relationship.

[0014] Furthermore, according to one aspect of the present invention, the method further includes: dynamically adjusting the state of charge range of the first battery system and the state of charge range of the second battery system, such that the state of charge of the second battery system always accurately reflects the state of charge of the battery system.

[0015] Furthermore, according to one aspect of the invention, the dynamic adjustment includes: setting the lower limit of the state of charge of the first system battery to be lower than the lower limit of the state of charge of the second system battery, and setting the upper limit of the state of charge of the second system battery to be higher than the upper limit of the state of charge of the first system battery.

[0016] Furthermore, according to one aspect of the invention, the dynamic adjustment further includes: opening the lower limit of the state of charge of the first system battery and supplementing the opened lower limit to the state of charge range of the second system battery.

[0017] Furthermore, according to one aspect of the invention, the dynamic adjustment further includes: reducing the upper limit of the state of charge of the second system battery and supplementing the reduced upper limit to the range of the first system battery.

[0018] Furthermore, according to one aspect of the invention, the dynamic adjustment further includes: opening the upper limit of the state of charge of the second system battery and supplementing the opened upper limit to the state of charge range of the second system battery.

[0019] Furthermore, in another aspect of the invention, in the battery system, the first battery system is a lithium iron phosphate battery system, and the second battery system is a ternary battery system.

[0020] According to another aspect of the invention, a computer device is provided, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the steps of a method according to one aspect of the invention.

[0021] According to another aspect of the invention, a recording medium is provided having a computer program stored thereon, which is executed by a computer to implement the steps of a method according to one aspect of the invention.

[0022] Compared with the prior art, the present invention can achieve one or more of the following beneficial effects:

[0023] 1) According to the present invention, by using a dual-cell system to form a battery system, it is possible to use a second-cell system (such as a ternary cell system) that is easy to calculate the state of charge (SOC) to more accurately estimate the overall state of charge of the battery system.

[0024] 2) According to the present invention, when different battery systems in the battery system exhibit different decay rates, the state of charge range of the second battery system can be dynamically adjusted so that the state of charge of the second battery system can always accurately reflect the overall state of charge of the battery system. Attached Figure Description

[0025] Figure 1 The OCV-SOC curves of lithium iron phosphate batteries and ternary batteries are shown.

[0026] Figure 2 This is a flowchart of a SOC estimation method for a battery system according to an embodiment of the present invention.

[0027] Figure 3 A schematic diagram of a dynamically adjusted SOC range for a battery system according to an embodiment of the present invention is shown.

[0028] Figure 4 A schematic diagram of a dynamically adjusted SOC range for a battery system according to an embodiment of the present invention is shown.

[0029] Figure 5 The state of charge (SOC) range of a dynamically adjusted battery system according to an embodiment of the present invention is shown.

[0030] Figure 6 Another schematic diagram of a dynamically adjustable battery system SOC range according to an embodiment of the present invention is shown.

[0031] Figure 7 A schematic diagram of a dynamically adjusted SOC range for a battery system according to an embodiment of the present invention is shown.

[0032] Figure 8 This is an example block diagram of a computer device for the method described herein according to an embodiment of the present invention. Detailed Implementation

[0033] The following will provide a more detailed description of the battery system, the method for estimating the state of charge (SOC) of the battery system, the computer equipment, and the recording medium, in conjunction with the accompanying drawings. It should be noted that the specific embodiments described below are exemplary and not limiting, intended to provide a basic understanding of the invention, and not intended to identify key or decisive elements of the invention or to limit the scope of protection.

[0034] The invention is described below with reference to block diagrams, diagrams, and / or flowcharts illustrating methods and apparatus according to embodiments of the invention. It will be understood that each block of these block diagrams and / or diagrams, and combinations thereof, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing apparatus to form a machine, such that these instructions, executable by the processor of the computer or other programmable data processing apparatus, create components for implementing the functions / operations specified in these block diagrams and / or diagrams and / or one or more block diagrams.

[0035] These computer program instructions may be stored in a computer-readable storage medium, which may instruct a computer or other programmable processor to perform functions in a particular manner, such that the instructions stored in the computer-readable storage medium constitute an instruction set comprising one or more boxes of an implementation flowchart and / or block diagram that specify the functions / operations.

[0036] These computer program instructions can be loaded onto a computer or other programmable data processor to cause a series of operational steps to be executed on the computer or other programmable processor, thereby constituting a computer-implemented process, such that these instructions, which execute on the computer or other programmable data processor, provide steps for implementing the functions or operations specified in one or more boxes of this flowchart and / or block diagram. It should also be noted that in some alternative implementations, the functions / operations shown in the boxes may not occur in the order shown in the flowchart. For example, two boxes shown sequentially may actually be executed substantially simultaneously, or these boxes may sometimes be executed in reverse order, depending on the functions / operations involved.

[0037] As mentioned above, battery systems composed of a single-system battery may suffer from problems such as inaccurate charge state measurement and low energy efficiency. Therefore, this invention provides a battery system comprising multiple batteries of different systems, such as a first-system battery and a second-system battery. In one embodiment, the first-system battery is a lithium iron phosphate (LFP) battery, while the second-system battery is a ternary lithium (NCM) battery, thus forming a dual-system battery system. In the dual-system battery system, the LFP battery can be connected in series with the ternary lithium battery, wherein the ratio of the number of LFP batteries to ternary lithium batteries can be 5:1, 3:1, or 1:1, or other ratios.

[0038] Figure 2This is a flowchart of a battery system SOC estimation method according to an embodiment of the present invention. Since the OCV-SOC curve of a ternary lithium battery has a large slope, the acquired OCV can be accurately mapped to SOC. Therefore, to estimate the SOC of the battery system, the upper and lower limits of the SOC of the second battery system can be mapped to the SOC range of the battery system to establish a mapping relationship between the upper and lower limits of the SOC of the second battery system and the SOC range of the battery system (step S1). In an embodiment where the first battery system uses a lithium iron phosphate (LFP) battery and the second battery system uses a ternary lithium battery (NCM), the upper and lower limits of the NCM of the ternary lithium battery are mapped to the SOC range of the battery system to establish a mapping relationship between the upper and lower limits of the NCM of the ternary lithium battery and the SOC range of the battery system. In one embodiment, to account for potential battery degradation in the NCM of the ternary lithium battery, its lower and upper limits can be set to 0% and 90%, respectively, and mapped to the SOC range of the battery system from 0% to 100%. In this case, the mapping relationship between the lower and upper limits of the NCM of the ternary battery and the state of charge range of the battery system is [0%, 90%] → [0%, 100%].

[0039] After mapping the upper and lower limits of the second-system battery to the state of charge (SOC) range of the battery system, the SOC of the second-system battery can be calculated, and the SOC of the battery system can be estimated based on the mapping relationship (step S2). The calculation of SOC can be based on known SOC calculation methods in the art, including but not limited to current integration and open-circuit voltage (OCV) calibration, as well as SOC estimation methods based on battery models. After calculating the SOC of the second-system battery, i.e., the ternary battery NCM, the calculated SOC is mapped to the SOC of the battery system according to the mapping relationship in step S2, thereby obtaining the estimated SOC of the battery system. In one embodiment, if the lower and upper limits of the NCM of the ternary lithium battery are set to 0% and 90% respectively and mapped to the state of charge range of the battery system from 0% to 100%, then when the state of charge of the NCM of the ternary lithium battery is 0%, the state of charge of the battery system is 0%; when the state of charge of the NCM of the ternary lithium battery is 45%, the state of charge of the battery system is 50%; and when the state of charge of the NCM of the ternary lithium battery is 90%, the state of charge of the battery system is 100%.

[0040] By using a battery system that includes multiple battery cells, it becomes possible to more accurately estimate the overall state of charge of the battery system using a second-cell battery system (such as a ternary battery system) that is easy to calculate the state of charge (SOC).

[0041] However, since batteries may degrade during use, and the degradation rates of different battery systems in a multi-system battery system may differ, it is necessary to dynamically adjust the SOC range of different battery systems so that the SOC range of the second battery system can still accurately correspond to the actual performance of the battery under different degradation states.

[0042] Figure 3 A schematic diagram illustrating the dynamic adjustment of the SOC range of a battery system according to an embodiment of the present invention is shown. Specifically, the lower limit of the state of charge (SOC) of the first battery system is set lower than the lower limit of the SOC of the second battery system, and the upper limit of the SOC of the second battery system is set higher than the upper limit of the SOC of the first battery system. Figure 3 As shown, in one embodiment, the lower limit of the state of charge (SOC) of the first battery system (lithium iron phosphate battery LFP) is set lower than the lower limit of the SOC of the second battery system (ternary lithium battery NCM), while the upper limit of the SOC of the ternary lithium battery NCM is set higher than the upper limit of the SOC of the lithium iron phosphate battery LFP. In this embodiment, it is important to note that due to the electrical characteristics of the ternary lithium battery NCM and the lithium iron phosphate battery LFP, during charging and discharging, the series-connected ternary lithium battery NCM will be discharged first, while the lithium iron phosphate battery LFP will be fully charged first. Therefore, to ensure that the SOC of the ternary lithium battery NCM accurately reflects the SOC of the battery system, the lower limit of the SOC of the ternary lithium battery NCM must always be maintained at the discharged point (0%), while its upper limit of the SOC must always correspond to the fully charged point (100%) of the lithium iron phosphate battery LFP. Figure 3 This illustrates a SOC range design where, specifically, the lower limit of the ternary lithium battery NCM is maintained at the battery system's discharge point (0%), and the corresponding state of charge (SOC) of the lithium iron phosphate battery LFP is referred to as SOC_L. Simultaneously, the upper limit of the lithium iron phosphate battery LFP is maintained at the battery system's fully charged point (100%), and the corresponding SOC of the ternary lithium battery NCM is referred to as SOC_H. Through this design, the SOC range of the ternary lithium battery NCM is maintained from the battery system's discharge point (0%) to its fully charged point (SOC_H). Furthermore, to ensure the relative stability of the SOC range (0%-SOC_H), two SOC ranges (0-SOC_L) and (SOC_H-100%) are retained and used to dynamically adjust the SOC range of the ternary lithium battery NCM when battery system degradation occurs.

[0043] After setting the state of charge (SOC) range of the ternary system battery NCM from the discharge point to the full charge point of the battery system and setting the upper and lower limits of the SOC of the lithium iron phosphate system battery LFP and the ternary system battery NCM to a corresponding relationship, in different attenuation states, the SOC range of the lithium iron phosphate system battery LFP and the SOC range of the ternary system battery NCM are dynamically adjusted so that the SOC of the ternary system battery NCM can always accurately reflect the SOC of the battery system in different attenuation states.

[0044] As described above, a battery system including different battery systems may experience attenuation at different speeds. Therefore, in a battery system including two battery systems, it is possible that the attenuation of the first system battery is greater than that of the second system battery and the attenuation of the second system battery is greater than that of the first system battery.

[0045] Figure 4 FIG. shows a schematic diagram of dynamically adjusting the SOC range of a battery system according to an embodiment of the present invention. In Figure 4 In the illustrated embodiment, the attenuation of the first system battery is greater than that of the second system battery. Since the attenuation of the first system battery, the lithium iron phosphate system battery LFP, is greater than that of the second system battery, the ternary system battery NCM (the battery capacity of the lithium iron phosphate system battery LFP decays faster), the upper limit (100%) of the lithium iron phosphate system battery LFP shifts downward relative to the ternary system battery NCM. As Figure 4 shown, the upper limit of the lithium iron phosphate system battery LFP corresponds to SOC_H1 of the ternary system battery NCM and SOC_H1 < SOC_H, which makes the charge range of the ternary system battery NCM become 0 - SOC_H1, and this range is reduced compared to the original 0 - SOC_H. To keep the charge range of the ternary system battery NCM unchanged, the 0% - SOC_L charge capacity range of the lithium iron phosphate system battery LFP is gradually opened, and the opened charge capacity is (SOC_H - SOC_H1) × weight, where weight is an adjustment coefficient usually > 1 (such as 1.1, 1.3, 1.5), and this coefficient can be adjusted during the actual operation of the battery system and specifically depends on the capacity comparison relationship between the ternary system battery NCM and the lithium iron phosphate system battery LFP. In the 0% - SOC_L charge capacity range of the lithium iron phosphate system battery LFP, the charge capacity with a value of (SOC_H - SOC_H1) × weight is opened downward and the downward-opened part of the capacity is supplemented into the ternary system battery NCM, which makes the available charge capacity SOC range of the ternary system battery NCM still remain 0 - SOC_H. By using the dynamically adjusted SOC range of the ternary system battery NCM, the SOC of the ternary system battery NCM can always accurately reflect the overall SOC of the battery system.

[0046] Figure 5The state of charge (SOC) range of a dynamically adjusted battery system according to an embodiment of the present invention is shown. Figure 5 In the first system, the battery continues to degrade, and the degradation of the first system has exceeded the threshold of the second system. For example... Figure 4 As shown, the LFP (Lithium Iron Phosphate) battery system has a limited open state of charge range, that is, the maximum open state of charge range is (0%-SOC_L). Returning to... Figure 5 When the LFP (Lithium Iron Phosphate) capacity of a lithium iron phosphate (LFP) battery exceeds the threshold (0% - SOC_L), meaning the lower limit of the LFP capacity has been fully opened and replenished to the NCM (Non-Lithium Lithium Cell) of the ternary lithium battery, the lower limit of the SOC of the NCM and the LFP are the same, i.e., 0%. In this case, the LFP will be discharged first, causing the SOC of the NCM to not accurately reflect the discharge point of the battery system. To ensure that the SOC range of the NCM still accurately reflects the SOC range of the battery system (discharge point - full charge point), a portion of the SOC capacity of the NCM needs to be reversed and replenished to the lower limit of the LFP capacity of the LFP.

[0047] Figure 6 Another schematic diagram of a dynamically adjusted SOC range for a battery system according to an embodiment of the present invention is shown. Figure 6 In the illustrated embodiment, a portion of the State of Charge (SOC) of the ternary lithium battery NCM is reverse-compensated to the lower limit range of the lithium iron phosphate battery LFP. Specifically, the upper limit of the ternary lithium battery NCM is set to (SOC_H - SOC_L'), where SOC_L' is the SOC value representing the percentage of SOC_L converted from LFP capacity to NCM capacity. Simultaneously, the ternary lithium battery NCM capacity corresponding to SOC_L' is supplemented to the lithium iron phosphate battery LFP. Under this adjustment, the upper limit of the ternary lithium battery NCM still corresponds to the full charge point of the battery system (which is also the full charge point of the lithium iron phosphate battery LFP), and the lower limit still corresponds to the discharge point of the ternary lithium battery NCM (which is also the discharge point of the ternary lithium battery NCM). The adjusted capacity range of the ternary lithium battery NCM (0 - (SOC_H - SOC_L')) can still accurately reflect the SOC of the battery system. If the lithium iron phosphate battery LFP continues to decay more than the ternary lithium battery NCM, the process is repeated. Figure 6 The steps.

[0048] Figure 7 A schematic diagram illustrating the state of charge (SOC) range of a battery system dynamically adjusted according to an embodiment of the present invention is shown. Figure 6In the illustrated embodiment, the battery degradation of the second system is greater than that of the first system; that is, the battery degradation of the ternary lithium battery NCM is greater than that of the lithium iron phosphate battery LFP. The full charge point of the lithium iron phosphate battery LFP corresponds to an upward shift in the ternary lithium battery NCM. For example... Figure 6 As shown, the full charge point of the lithium iron phosphate (LFP) battery corresponds to the SOC_H1 of the ternary lithium battery (NCM). In this case, the (SOC_H-100%) range of the ternary lithium battery NCM is gradually opened upwards, aligning this range with the full charge point of the LFP. Thus, the available SOC range of the ternary lithium battery NCM remains (0%-SOC_H1), and the SOC of the battery system is estimated based on the adjusted (0%-SOC_H1). Since the adjusted SOC range of the ternary lithium battery NCM (0%-SOC_H1) still corresponds to the battery system's discharge point to full charge point, it accurately reflects the battery system's SOC.

[0049] As described above, when different types of degradation occur in battery systems comprising different battery systems, dynamically adjusting the state of charge (SOC) range of the second battery system (ternary lithium battery NCM) ensures that its SOC accurately reflects the SOC of the entire battery system. Therefore, even after different types of degradation occur in the battery system, dynamically adjusting the SOC range of the second battery system ensures that the calculated current SOC of the second battery system accurately reflects the current SOC of the entire battery system.

[0050] According to another aspect of the present invention, a battery system is also provided, the battery system comprising a first battery system and a second battery system. In one embodiment, the first battery system is a lithium iron phosphate (LFP) battery system and the second battery system is a ternary lithium (NCM) battery system, thereby constituting a dual-system battery system. In the dual-system battery system, the LFP battery system can be connected in series with the ternary lithium battery system, wherein the ratio of the number of LFP batteries to the number of ternary lithium batteries can be 5:1, 3:1, or 1:1, or other ratios. To estimate the state of charge (SOC) of the battery system, the upper and lower limits of the SOC of the second battery system can be mapped to the SOC range of the battery system to establish a mapping relationship between the upper and lower limits of the SOC of the second battery system and the SOC range of the battery system, that is, mapping the upper and lower limits of the ternary lithium NCM battery system to the SOC range of the battery system. In one embodiment, to account for possible battery degradation of the ternary lithium NCM battery system, its lower and upper limits can be set to 0% and 90%, respectively, which are mapped to the SOC range of the battery system system from 0% to 100%. In this case, the mapping relationship between the lower and upper limits of the NCM of the ternary battery and the state of charge range of the battery system is [0%, 90%] → [0%, 100%].

[0051] After mapping the upper and lower limits of the second-system battery to the state of charge (SOC) range of the battery system, the SOC of the second-system battery can be calculated, and the SOC of the battery system can be estimated based on the mapping relationship. The calculation of SOC can be based on known SOC calculation methods in the art, including but not limited to current integration and open-circuit voltage (OCV) calibration, as well as SOC estimation methods based on the battery model. After calculating the SOC of the second-system battery, i.e., the ternary battery NCM, the calculated SOC is mapped to the SOC of the battery system according to the mapping relationship in step S2, thereby obtaining the estimated SOC of the battery system. In one embodiment, if the lower and upper limits of the NCM of the ternary lithium battery are set to 0% and 90% respectively and mapped to the state of charge range of the battery system from 0% to 100%, then when the state of charge of the NCM of the ternary lithium battery is 0%, the state of charge of the battery system is 0%; when the state of charge of the NCM of the ternary lithium battery is 45%, the state of charge of the battery system is 50%; and when the state of charge of the NCM of the ternary lithium battery is 90%, the state of charge of the battery system is 100%.

[0052] In the event of battery degradation in the battery system, the State of Charge (SOC) range of the second battery system in the battery system can be dynamically adjusted. The specific method is the same as described above and will not be repeated here.

[0053] Although the present invention has been described previously with a focus on a method for estimating the state of charge (SOC) of a battery system and an embodiment of a battery system, the present invention is not limited to these embodiments. The present invention may also be implemented in the following ways: by a computer device for performing the above-described method, or by a computer program for performing the above-described method, or by a computer program for implementing the functions of the above-described device, or by a computer-readable recording medium on which the computer program is recorded.

[0054] exist Figure 8 The diagram illustrates a computer apparatus for estimating the state of charge (SOC) of a battery system as described above, according to an embodiment of the present invention. Figure 8 As shown, computer device 200 includes a memory 201 and a processor 202. Although not shown, computer device 200 also includes a computer program stored on the memory 201 and executable on the processor 202. When the processor executes the program, it implements... Figure 2 , Figure 3 , Figure 4 , Figure 6 and Figure 7 The steps are shown in the figure.

[0055] Additionally, as described above, the present invention can also be implemented as a recording medium storing a program for causing a computer to execute the state of charge (SOC) estimation method for a battery system as described above.

[0056] Here, various recording media can be used as recording media, such as disks (e.g., magnetic disks, optical disks, etc.), cards (e.g., memory cards, optical cards, etc.), semiconductor memory (e.g., ROM, non-volatile memory, etc.), and tapes (e.g., magnetic tape, cassette tape, etc.).

[0057] By recording and distributing computer programs that enable computers to perform the method for adjusting the distribution of battery swapping demand in the above embodiments or that enable computers to implement the function of the device for adjusting the distribution of battery swapping demand in the above embodiments on these recording media, it is possible to reduce costs and improve portability and versatility.

[0058] Furthermore, by loading the aforementioned recording medium onto a computer, the computer reads the computer program recorded on the recording medium and stores it in a memory. The computer's processor (CPU: Central Processing Unit, MPU: Micro Processing Unit) reads the computer program from the memory and executes it. Thus, the method for adjusting the distribution of battery swapping demand at a battery swapping station as described in the above embodiments can be executed, and the function of the device for adjusting the distribution of battery swapping demand at a battery swapping station as described in the above embodiments can be realized.

[0059] Those skilled in the art will understand that the present invention is not limited to the embodiments described above, and can be implemented in many other forms without departing from its spirit and scope. For example, although the embodiments of the present invention are all based on dual-cell battery systems, those skilled in the art will realize that similar battery systems can be composed using three or more different types of battery systems, and that similar state-of-charge estimation methods can be used to obtain the state of charge of the battery system. Therefore, the examples and embodiments shown are to be considered illustrative rather than restrictive, and the present invention may cover various modifications and substitutions without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. A method for estimating the state of charge (SOC) of a battery system, characterized in that, The battery system includes a first battery cell and a second battery cell, and the method includes: The upper and lower limits of the state of charge of the second system battery are mapped to the state of charge range of the battery system to establish a mapping relationship between the upper and lower limits of the state of charge of the second system battery and the state of charge range of the battery system. Calculate the state of charge (SOC) of the second battery system and estimate the SOC of the battery system based on the mapping relationship; and dynamically adjust the SOC range of the first battery system and the SOC range of the second battery system so that the SOC of the second battery system always accurately reflects the SOC of the battery system, wherein the dynamic adjustment includes: setting the lower limit of the SOC of the first battery system to be lower than the lower limit of the SOC of the second battery system, and setting the upper limit of the SOC of the second battery system to be higher than the upper limit of the SOC of the first battery system; Furthermore, when the degradation of the first system battery exceeds a threshold, the dynamic adjustment further includes: reversing the state-of-charge capacity of the second system battery to the lower limit range of the first system battery.

2. The method of claim 1, wherein, The dynamic adjustment further includes: opening the lower limit of the state of charge of the first system battery and supplementing the opened lower limit into the state of charge range of the second system battery.

3. The method of claim 1, wherein, The dynamic adjustment further includes: lowering the upper limit of the state of charge of the second system battery and supplementing the lowered upper limit into the range of the first system battery.

4. The method of claim 1, wherein, The dynamic adjustment further includes: opening up the upper limit of the state of charge of the second system battery and supplementing the opened upper limit into the state of charge range of the second system battery.

5. The method according to any one of claims 1-4, characterized in that, The first battery system is a lithium iron phosphate battery system, and the second battery system is a ternary battery system.

6. A battery system characterized by, The battery system includes a first battery cell and a second battery cell, and the state of charge (SOC) of the battery system is estimated through the following steps: The upper and lower limits of the state of charge of the second system battery are mapped to the state of charge range of the battery system to establish a mapping relationship between the upper and lower limits of the state of charge of the second system battery and the state of charge range of the battery system. Calculate the state of charge of the second battery system and estimate the state of charge of the battery system based on the mapping relationship; as well as The state of charge (SOC) range of the first battery system and the SOC range of the second battery system are dynamically adjusted so that the SOC of the second battery system always accurately reflects the SOC of the battery system. The dynamic adjustment includes setting the lower limit of the state of charge of the first system battery to be lower than the lower limit of the state of charge of the second system battery, and setting the upper limit of the state of charge of the second system battery to be higher than the upper limit of the state of charge of the first system battery. Furthermore, when the degradation of the first system battery exceeds a threshold, the dynamic adjustment further includes: reversing the state-of-charge capacity of the second system battery to the lower limit range of the first system battery.

7. The battery system of claim 6, wherein, The dynamic adjustment further includes: opening the lower limit of the state of charge of the first system battery and supplementing the opened lower limit into the state of charge range of the second system battery.

8. The battery system of claim 7, wherein, The dynamic adjustment further includes: lowering the upper limit of the state of charge of the second system battery and supplementing the lowered upper limit into the range of the first system battery.

9. The battery system of claim 6, wherein, The dynamic adjustment further includes: opening up the upper limit of the state of charge of the second system battery and supplementing the opened upper limit into the state of charge range of the second system battery.

10. The battery system according to any one of claims 6-9, wherein, The first battery system is a lithium iron phosphate battery system, and the second battery system is a ternary battery system.

11. A computer device comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, characterized in that, When the processor executes the program, it implements the steps of the method according to any one of claims 1 to 5.

12. A recording medium having stored thereon a computer program, characterized by The program is executed by a computer to perform the steps of the method according to any one of claims 1 to 5.

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