SOC Estimation Method, Mobile Power Supply, and Readable Storage Medium

Abstract

This application discloses a SOC estimation method, a mobile power supply and a readable storage medium, which mainly calculates the fixed step size of the electric quantity of the mobile power supply, sequentially superimposes the unit electric quantity in a stepwise manner, calculates the cumulative electric quantity from the last time when the SOC of the mobile power supply changes, compares the absolute value of the cumulative electric quantity with the fixed step size of the electric quantity, and adds / subtracts the fixed step size to / from the SOC value according to the comparison result, or keeps the SOC value as it is, and obtains the starting value of the cumulative electric quantity at the next time point.By obtaining the SOC value of the mobile power supply in this way, in actual programming, only if judgment and addition / subtraction can be used instead of the division of the existing SOC estimation method, which greatly reduces the amount of calculation when estimating SOC, reduces the consumption of calculation resources and the occupation of memory space, greatly reduces the requirements for the computing power of the chip and the resources of peripheral devices, reduces the energy consumption of the equipment, improves the SOC estimation speed, and improves the stability of calculation.

Description

Technical Field

[0001] [Cross - reference to Related Applications] This application claims priority from a Chinese patent application with the application number 202210345240.X filed with the Chinese Patent Office on April 2, 2022 (application title: "SOC Estimation Method, Mobile Power Supply, and Readable Storage Medium"), and the entire content thereof is incorporated into this application by reference.

[0002] This application relates to the technical field of SOC estimation of mobile power supplies, and in particular, to an SOC estimation method, a mobile power supply, and a readable storage medium.

Background Art

[0003] Currently, in the market, for portable micro - sized energy storage products, due to the soaring cost of electronic products, each manufacturer has begun to continuously search for cheaper alternatives. When selecting an alternative, usually, a cheap chip with weak computing power is selected, or the resources and performance of the peripheral devices of the chip are continuously compressed. However, in micro - sized mobile power products, there are relatively many related operations such as SOC (State of Charge) estimation, and only chips with high performance, high computing power, and fast computing speed can be applied. Pursuing only cheap chips without simplifying the operations will inevitably make them inapplicable and incompatible.

[0004] In chip operations, the computing overhead required for SOC estimation is relatively large. In current technologies, the ampere - hour integration method is often adopted for SOC estimation, and its formula is as follows: JPEG0007708859000001.jpg13163 This algorithm uses operations such as addition, subtraction, multiplication, and division, but the computing overhead is extremely large, and cheap chips with weak computing power cannot meet its computing requirements. Therefore, a low - cost SOC estimation algorithm is urgently needed.

Summary of the Invention

[0005] To solve the above problems, embodiments of the present application provide a SOC estimation method, a mobile power source, and a readable storage medium.

[0006] To solve the above technical problems, the technical solutions adopted by the embodiments of the present application are as follows: A SOC estimation method applied to a mobile power source is provided, and the method includes: Step S1. Calculating the value of the amount of electricity of a fixed step size of the mobile power source; Step S2. Sequentially and stepwise superimposing unit amounts of electricity to calculate the cumulative amount of electricity from the time point of the previous change in SOC of the mobile power source; Step S3. Comparing the absolute value of the cumulative amount of electricity with the value of the amount of electricity of the fixed step size, and performing addition and subtraction based on the comparison result to obtain the current SOC value and the start value of the cumulative amount of electricity at the next time point; Step S4. After updating the SOC value, if the cumulative amount of electricity continues to change, repeating steps S2 - S3; if the cumulative amount of electricity does not change, retaining the previous SOC value and saving the current cumulative amount of electricity.

[0007] Optionally, step S1 includes: Obtaining the value of the amount of electricity of a fixed step size of the mobile power source from a first formula (where the first formula is as follows: JPEG0007708859000002.jpg46165

[0008] Optionally, step S2 includes calculating the unit amount of electricity from a second formula (where the second formula is as follows: JPEG0007708859000003.jpg38163

[0009] Optionally, step S2 includes: Calculating the cumulative amount of electricity from the time point of the previous change in SOC of the mobile power source from a third formula (where the third formula is as follows: JPEG0007708859000004.jpg26135

[0010] Optionally, step S3 is as follows: When the absolute value of the cumulative charge amount is greater than or equal to the charge amount value of the fixed step size, add or subtract the fixed step size to / from the SOC value at the previous time point according to the charge / discharge state of the mobile power supply to obtain the current SOC value, and subtract or add the charge amount value of the fixed step size to / from the cumulative charge amount to obtain the start value of the cumulative charge amount at the next time point; When the absolute value of the cumulative charge amount is less than the charge amount value of the fixed step size, hold the SOC value at the previous time point as the current SOC value, and save the cumulative charge amount as the start value of the cumulative charge amount at the next time point.

[0011] Optionally, the method further includes correcting the current SOC value obtained in step S3 at the charge / discharge terminal stage of the mobile power supply.

[0012] Optionally, correcting the SOC of the mobile power supply at the charge / discharge terminal stage of the mobile power supply described above is JPEG0007708859000005.jpg34164where SOC' is the corrected SOC value during charging, SOC is the SOC value before correction, and α is the charging correction parameter).

[0013] Optionally, correcting the SOC of the mobile power supply at the charge / discharge terminal stage of the mobile power supply described above is JPEG0007708859000006.jpg53162

[0014] To solve the above technical problem, another technical solution adopted by the embodiments of the present application is as follows: A mobile power supply is provided, and the mobile power supply includes at least one processor, and a memory communicatively connected to the at least one processor. The memory stores commands executable by the at least one processor, the commands are executed by the at least one processor, and the at least one processor can be caused to execute the method for calculating the state of charge.

[0015] To solve the above technical problems, another technical solution adopted by the embodiments of the present application is as follows: A readable storage medium is provided, and computer-executable commands are stored in the readable storage medium. The computer-executable commands are for causing a computer to execute the method for calculating the state of charge.

[0016] The beneficial effects are as follows: By adopting the SOC estimation method as described above, in actual programming, only if judgments and addition and subtraction can be used instead of division in the existing SOC estimation method, significantly reducing the calculation amount when estimating the SOC, reducing the consumption of calculation resources and the occupation of storage space, significantly reducing the requirements for the computing power of the chip and the resources of peripheral devices, reducing the energy consumption of the equipment, increasing the SOC estimation speed, and enhancing the stability of the calculation.

Brief Description of the Drawings

[0017] One or more embodiments are exemplarily illustrated by their corresponding drawings. These exemplary descriptions do not constitute a limitation on the embodiments. In the drawings, elements with the same reference numeral labels represent similar elements, and unless otherwise specified, the figures in the drawings do not limit the scale.

Figure 1

Figure 2

Figure 3

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Figure 5

Figure 6

Figure 7

Figure 8

Embodiments for Carrying Out the Invention

[0018] In order to more clearly illustrate the purpose, technical solution and advantages of the present application, the present application will be further described in detail below based on the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0019] It should be noted that each feature in the embodiments of the present application can be combined with each other as long as there is no conflict, and all are within the protection scope of the present application. In addition, in the schematic diagram of the device, the functional modules are divided and the logical procedures are shown in the flowchart. However, in some cases, different divisions or procedures of the modules in the schematic diagram of the device or the flowchart may be used, and the steps shown or described may also be executed.

[0020] Unless otherwise defined, all technical terms and scientific terms used in this specification have the same meaning as commonly understood by those skilled in the technical field to which the present application belongs. The terms used in the specification of the present application are only for the purpose of explaining specific embodiments and are not for the purpose of limiting the present application. The term "and / or" used in this specification includes any and all combinations of one or more of the related listed items.

[0021] The mobile power source in this application is a portable micro energy storage power source with a screen display unit (capable of displaying the SOC value) that can supply power to digital products and small household appliances, etc.

[0022] The SOC estimation method and device can be applied to the SOC estimation process of the mobile power source. As shown in FIG. 1, FIG. 1 is an application scenario provided by an embodiment of this application. This application scenario includes a power grid 10, a load 20, and a mobile power source 30. The mobile power source 30 is respectively connected to the power grid 10 and the load 20. The mobile power source 30 includes a controller 31 and a display 32, and the controller 31 is connected to the display 32. The mobile power source 30 is a portable charger that can store electrical energy by itself. The operating states of the mobile power source 30 include a charging state and a discharging state. The power grid 10 is for charging the mobile power source 30, and the mobile power source 30 is for discharging to the load 20. When the mobile power source 30 is charging and discharging, the controller 31 controls the display 32 to display the current SOC value of the mobile power source 30, that is, the current electrical quantity of the mobile power source 30. Here, the display of the display 32 includes, but is not limited to, the numbers 1 - 100. When the mobile power source 30 is charging, the numbers displayed on the display 32 gradually increase. When the mobile power source 30 is discharging, the numbers displayed on the display 32 gradually decrease. Further, the SOC value is the ratio of the remaining capacity of the mobile power source to the capacity in the fully charged state of the mobile power source. The range of values that the SOC can take is 0% - 100%. When the value of the SOC is equal to 0%, it indicates that the discharge of the mobile power source is completely performed. When the value of the SOC is 100%, it indicates that the mobile power source is in a fully charged state. By knowing the values that the SOC can take, the operation of the mobile power source can be controlled.

[0023] JPEG0007708859000007.jpg54165

[0024] Here, the power grid 10 may be a commercial power supply or any facility capable of charging the mobile power supply 30. The load 20 includes, but is not limited to, electronic products of portable mobile devices such as wireless phones and notebook computers.

[0025] In one embodiment of the present application, as shown in FIG. 2, the controller 31 includes at least one processor 311 (taking one processor 311 as an example in FIG. 2) and a memory 312 (taking the connection by a bus as an example in FIG. 2).

[0026] Here, the memory 312 stores commands executable by the at least one processor 311, and the commands are executed by the at least one processor 311, and the at least one processor 311 can be made to execute the following SOC estimation method.

[0027] Memory 312 can be used as a computer-readable non-volatile storage medium to store non-volatile software programs, computer-executable non-volatile programs, and modules such as program commands / modules corresponding to the SOC estimation method in the embodiments of the present application. The processor 311 executes the non-volatile software programs, commands, and modules stored in the memory 312 to execute various functional applications and data processing of the mobile power supply 30, that is, to implement the SOC estimation method in the embodiments of the following method.

[0028] Memory 312 may include a program storage area and a data storage area. Here, the program storage area can store application programs necessary for handling the system and at least one function. Also, the memory 312It may include a high-speed random access memory and may also include a non-volatile memory. For example, it includes at least one magnetic disk memory device, a flash memory device, or other non-volatile solid-state memory devices. In some embodiments, the memory 312 includes, as an option, a memory that is remotely installed with respect to the processor 311.

[0029] The one or more modules are stored in the memory 312 and, when executed by the one or more processors 311, execute the SOC estimation method in any of the following method embodiments, for example, execute the steps of the method in FIG. 3 described below.

[0030] Other devices are also connected to the mobile power supply 30 to better execute the method provided by the embodiments of the present application. For example, a display screen or other displays can be electrically connected, and the communication facilities of the target user can be connected by remote communication, etc., which will not be described one by one here.

[0031] The above mobile power supply 30 can execute the method provided by the embodiments of the present application and is equipped with functional modules corresponding to the execution of the method. For technical details not described in detail in this embodiment, reference can be made to the method provided by the embodiments of the present application.

[0032] Referring to FIGS. 3 and 4, FIG. 3 is a flowchart of the SOC estimation method provided by the embodiments of the present application, and FIG. 4 is a process schematic diagram of the SOC estimation provided by the embodiments of the present application. The method is applied to the above mobile power supply and includes the following steps as shown in FIG. 3.

[0033] S01. Calculate the value of the electrical quantity of the fixed step size of the mobile power supply. Considering the influence of temperature on the charge and discharge of the battery, a factor of ambient temperature is taken into account for the value of the fixed-step-size charge quantity, that is, temperature correction is performed. Specifically, the value of the fixed-step-size charge quantity of the mobile power supply is calculated from the following formula, where the formula is as follows: JPEG0007708859000008.jpg128163

[0034] S02, the unit charge quantity is sequentially and stepwise superimposed to calculate the cumulative charge quantity from the time point of the previous SOC change of the mobile power supply. Specifically, according to the unit time, the unit charge quantity is sequentially and stepwise superimposed to calculate the cumulative charge quantity Q from the time point of the previous SOC change of the mobile power supply.

[0035] As an option, in this embodiment, the unit time is the calculation period T2 of the SOC of the mobile power supply. However, when obtaining the unit charge quantity, it is necessary to first obtain the calculation period T2 of the SOC of the mobile power supply, the sampling period T1 of the current, and the sampling current I. Here, the smaller the sampling period T1 of the current, the more the actual change situation can be reflected. However, in actual applications, considering the performance and necessity of the chip in the mobile power supply (for example, when the temperature change is relatively slow), the sampling period T1 of the current may be at the level of hundreds / milliseconds or seconds. However, the sampling current I is at the level of milliseconds or microseconds. Preferably, the sampling period T1 of the current may be 10 ms. If the value of the calculation period T2 of the SOC is too small, the calculation amount will be excessive. If the value of the calculation period T2 of the SOC is too large, there may be a risk that the change of the SOC of the mobile power supply is not smooth enough. As an option, the value of the calculation period T2 of the SOC can take 100 ms. The sampling period T1 of the current and the calculation period T2 of the SOC can be adjusted and set according to the actual situation.

[0036] Specifically, since the calculation period T2 of the SOC of the mobile power supply is much larger than the sampling period T1 of the mobile power supply, within one calculation period T2 of the SOC, there are multiple sampling periods T1 of current, and since the sampling current within each sampling period T1 of current may be different, the unit amount of electricity ΔQ within each calculation period of the SOC n adopts an integration method and is expressed as follows: JPEG0007708859000009.jpg25141

[0037] Considering the actual programming implementation, it is necessary to discretize the above integration formula, that is, the average value of the currents sampled multiple times is used as a constant current within the time of the calculation period T2. JPEG0007708859000010.jpg38125

[0038] In the above formula, for the acquisition of the k value, it can be obtained only by one division, but after all, it is still a division. In order to reduce the operation overhead, the k value is further optimized as follows: JPEG0007708859000011.jpg642Here, j is a positive integer. k takes the power of 2. The advantages of setting it in this way are as follows: In the chip, binary arithmetic is adopted. When the divisor is the power of 2, the operation speed can be increased by using a left shift instead of division.

[0039] Since the sampling current I corresponding to each sampling period T1 is necessarily different, it should be understood that each unit amount of electricity is also different.

[0040] At a certain point in time, the cumulative amount of electricity is the sum of the cumulative amount of electricity at the previous point in time and the unit amount of electricity. Here, Q n =Q n-1 +ΔQ n ; Here, the time difference between the current point in time and the previous point in time is T2, Q n represents the cumulative amount of electricity at the current point in time, Q n-1 represents the cumulative amount of electricity at the previous point in time, and ΔQ nrepresents the unit electric quantity from the previous point in time to the current point in time.

[0041] When taking the change point of the previous SOC as the start point, the above formula is further converted into the following formula: JPEG0007708859000012.jpg29119

[0042] It should be understood that the above unit time can be set according to actual needs. For example, the unit time can be set to 2T2 or 3T2, and accordingly, the unit electric quantity also changes accordingly. The larger the unit time is set, the fewer times of comparison in the subsequent step S03, and the calculation overhead of the chip can be reduced to a certain extent.

[0043] S03. Compare the absolute value of the cumulative electric quantity with the value of the electric quantity of the fixed step size, perform addition and subtraction based on the comparison result, and obtain the SOC value at the current point in time and the start value of the cumulative electric quantity at the next point in time. Specifically, compare the absolute value of the cumulative electric quantity with the value of the electric quantity of the fixed step size. When the absolute value of the cumulative electric quantity is greater than or equal to the value of the electric quantity of the fixed step size, add or subtract the fixed step size to the SOC value at the previous point in time according to the charge and discharge state of the mobile power supply to obtain the current SOC value, and subtract or add the value of the electric quantity of the fixed step size to the cumulative electric quantity to obtain the start value of the cumulative electric quantity at the next point in time. When the absolute value of the cumulative electric quantity is smaller than the value of the electric quantity of the fixed step size, hold the SOC value at the previous point in time as the current SOC value, and save the cumulative electric quantity as the start value of the cumulative electric quantity at the next point in time.

[0044] As described above, when the absolute value of the cumulative electric quantity is smaller than the value of the electric quantity of the fixed step size, it also corresponds to performing addition and subtraction, but it should be understood that the additive or subtractive number is 0.

[0045] Here, when the mobile power supply operates, the mobile power supply acquires a charge-discharge state, and the processor periodically acquires the cumulative charge of the mobile power supply. When the mobile power supply is in a charging state, the input is greater than the output, and the cumulative charge is positive. When the mobile power supply is in a discharging state, the input is less than the output, and the cumulative charge is negative.

[0046] Specifically, after each calculation period T2 of the SOC, the cumulative charge Q is compared with the charge value ΔC of the fixed step size.

[0047] When |Q|≧ΔC and the mobile power supply is in a charging state, the fixed step size is added to the previous SOC value to obtain the current SOC value, and the charge value of the fixed step size is subtracted from the cumulative charge to obtain the start value of the cumulative charge at the next time point. When |Q|≧ΔC and the mobile power supply is in a discharging state, the fixed step size is subtracted from the previous SOC value to obtain the current SOC value, and the charge value of the fixed step size is added to the cumulative charge to obtain the start value of the cumulative charge at the next time point.

[0048] S04. After the SOC value is updated, if the cumulative charge continues to change, steps S02 - S03 are cycled. If the cumulative charge does not change, the previous SOC value is held, and the current cumulative charge is saved. Specifically, when the mobile power supply is being charged or discharged, the cumulative charge constantly changes. When the charging and discharging of the mobile power supply stops, the cumulative charge does not change. Here, each time a cycle is performed, the start time point for calculating the cumulative charge in step S02 changes. The start time point is updated at each change time point of the SOC, and the corresponding start value of the cumulative charge is also updated to Q - ΔC.

[0049] The following takes the charging of a mobile power supply at room temperature as an example to show a process schematic diagram of steps S02 - S04 in the SOC estimation process. Figure 5 is a schematic diagram of the cumulative amount of electricity from the start of charging to a certain point during the charging of the mobile power supply. Figure 6 is a schematic diagram of the total cumulative amount of electricity from the start of charging to the end of charging of the mobile power supply.

[0050] As shown in Figures 5 and 6, time t M-1 is the start time of a certain charging of the mobile power supply, time t N1 is a certain time during charging, and time t M is the time to stop charging. Assume that the SOC value at the start time of charging is 23.4% and the fixed step size P is 0.1%.

[0051] During charging, the current is sampled within each sampling period T1 of each current to obtain the real - time current. Within each calculation period T2 of each SOC, after calculating the unit amount of electricity within this period, the cumulative amount of electricity and the SOC are calculated.

[0052] Regarding the unit amount of electricity within each calculation period T2 of each SOC, its calculation formula is as follows: JPEG0007708859000013.jpg954Here, k = 8 and n = 1, 2,..., 8.

[0053] After each calculation period of each SOC, the cumulative amount of electricity is calculated, and the cumulative amount of electricity is compared with the value ΔC of the electricity amount of the fixed step size. In this example, assuming that the start value of the cumulative amount of electricity is 0, ΔQ1, ΔQ1 + ΔQ2, ΔQ1 + ΔQ2 + ΔQ3, ΔQ1 + ΔQ2 + ΔQ3 + ΔQ4,..., ΔQ1 + ΔQ2 +... + ΔQ8 are all compared with ΔC. Assuming in this example that ΔQ1 + ΔQ2 +... + ΔQ7 < ΔC and ΔQ1 + ΔQ2 +... + ΔQ7 + ΔQ8 ≧ ΔC, at time t N1 the SOC value at this time is the SOC value at time t M-1 plus the fixed step size P, that is, 23.5%. And the value of the electricity amount of the fixed step size is subtracted from the cumulative amount of electricity to obtain the start value of the cumulative amount of electricity at the next time point, that is, QtN1 -ΔC is obtained, where Q tN1 = ΔQ1 + ΔQ2 +... + ΔQ8.

[0054] As shown in FIG. 6, the mobile power supply continues to charge, the cumulative charge continues to change, and the above process continues to cycle. Additionally, for time t N2 at that time, the starting point for calculating the cumulative charge is updated to time t N1 and the starting value of the cumulative charge becomes Q tN1 -ΔC, and the cumulative charge becomes the charge accumulated from time t N1 to time t N2 . Similarly, for times t N3 , t N4 , t M , each time the SOC value changes, the starting point for calculating the cumulative charge is updated to the previous SOC change time point, the starting value of the cumulative charge is updated to the cumulative charge at the previous SOC change time point minus ΔC, and the cumulative charge becomes the charge accumulated from the previous SOC change time point to that time point.

[0055] t N2 t N3 t N4 until time t tN2 the cumulative charges Q tN3 Q tN4 are each greater than or equal to ΔC. Therefore, the SOC values at times t N2 t N3 t N4 are 23.6%, 23.7%, and 23.8% respectively, and at time t N4 the starting value of the cumulative charge for the next time point is Q tN4 -ΔC. Until time t M the cumulative charge Q tM < ΔC, so the SOC value at time t M is maintained at the SOC at the previous time t N4 i.e., 23.8%, and the current cumulative charge is saved as the starting value of the cumulative charge when the charge changes next time.

[0056] As for the chip, in terms of arithmetic overhead, it is remainder calculation > division > multiplication > subtraction > addition. For an inexpensive chip with weak arithmetic capabilities, especially a chip without a hardware divider, many divisions result in a large overhead, and this calculation method is also disadvantageous for calculation stability. By adopting the SOC estimation method as described above, in actual programming, only if judgments and addition / subtraction can be used instead of existing divisions, significantly reducing the calculation amount when estimating the SOC, reducing the consumption of calculation resources and the occupation of memory space (in actual applications, a chip with low levels of 8 bits and 5 - 16K Flash can be adopted), significantly reducing the requirements for the arithmetic capabilities of the chip and the resources of peripheral devices, reducing the energy consumption of the equipment, increasing the SOC estimation speed, and enhancing the stability of the calculation.

[0057] In some embodiments, it further includes correcting the SOC value obtained in step S04 at the charging and discharging end stage of the mobile power supply.

[0058] From the characteristics of the charging and discharging terminal voltage of lithium iron phosphate, it can be seen that for the voltage of the battery, at the full charge and full discharge stages, the voltage has a tendency to rise rapidly and a tendency to drop rapidly. Therefore, the SOC is corrected at the charging and discharging end stage.

[0059] For example, according to the characteristics of the battery, a voltage threshold U up corresponding to the charging end and a voltage threshold U de corresponding to the discharging end are each set to one, when the voltage U of the mobile power supply is between U up and U de and does not exceed the range, it is considered that the SOC of the mobile power supply will not become fully charged or empty, so there is no need to correct the SOC value obtained in step S04.

[0060] During charging, when the voltage U of the mobile power supply is greater than U up and the SOC does not become fully charged, a correction process is introduced: JPEG0007708859000014.jpg25161

[0061] During discharge, when the voltage U of the mobile power supply is less than U de and the SOC does not become empty, a correction process is introduced: JPEG0007708859000015.jpg25162

[0062] To further improve the accuracy, according to the characteristics of the battery, the voltage thresholds U up1 and U up2 corresponding to the end of charging and the voltage thresholds U de1 and U de2 corresponding to the end of discharge are each set to two, and it should be understood that the corresponding correction parameters α1, α2, β1, and β2 can also be obtained in actual tests.

[0063] According to the SOC estimation method as described above, experiments were conducted. Under normal temperature conditions, charging was carried out using a mobile power supply with a rated capacity of 5.4 Ah. SOC estimations were performed using the conventional ampere-hour integration method and the method as described above in this application respectively. A comparison diagram of the obtained SOC estimation curves is shown in FIG. 7. The cumulative charge amount / rated capacity in the figure represents the ampere-hour integration method used.

[0064] As can be seen from FIG. 7, during charging, the degree of coincidence of the SOC curves obtained by both methods is relatively high. Especially at the end of charging, the corrected SOC estimated value and the SOC estimation curve diagram obtained by the ampere-hour integration method also highly coincide, indicating that the estimation accuracy of the SOC estimation method of this application is high.

[0065] Referring to FIG. 8, FIG. 8 is a block diagram of the configuration of the SOC estimation device provided by an embodiment of this application. As shown in FIG. 8, the SOC estimation device 40 includes a first calculation module 41, a second calculation module 42, a comparison acquisition module 43, and a determination cycle module 44.

[0066] The first calculation module 41 is for calculating the value of the electrical quantity of the fixed step size of the mobile power supply. The second calculation module 42 is for calculating the cumulative charge amount from the time point of the previous change in the SOC of the mobile power supply by sequentially and stepwise superimposing unit charge amounts. The comparison and acquisition module 43 is for comparing the absolute value of the cumulative charge amount with the charge amount value of the fixed step size, performing addition and subtraction based on the comparison result, and acquiring the current SOC value and the start value of the cumulative charge amount at the next time point. The determination cycle module 44 determines whether the cumulative charge amount continues to change after the update of the SOC value. When the cumulative charge amount continues to change, the first calculation module 41, the second calculation module 42, and the comparison and acquisition module 43 are cycle-controlled so that the first calculation module 41 calculates the charge amount value of the fixed step size of the mobile power supply, the second calculation module 42 sequentially and stepwise superimposes unit charge amounts to calculate the cumulative charge amount from the time point of the previous change in the SOC of the mobile power supply, and the comparison and acquisition module 43 compares the absolute value of the cumulative charge amount with the charge amount value of the fixed step size, performs addition and subtraction based on the comparison result, and acquires the current SOC value and the start value of the cumulative charge amount at the next time point. When the cumulative charge amount does not change, it is for holding the previous SOC value and saving the current cumulative charge amount.

[0067] Note that the SOC estimation device can execute the SOC estimation method provided by the embodiments of the present application and has functional modules and beneficial effects corresponding to the execution of the method. For technical details not described in detail in the embodiments of the SOC estimation device, reference can be made to the SOC estimation method provided by the embodiments of the present application.

[0068] Embodiments of the present application further provide a computer-readable non-volatile storage medium. The computer-readable storage medium stores computer-executable commands, which are executed by one or more processors. For example, the steps of the methods in FIGS. 3 and 4 described above are executed, and the functions of each module in FIG. 8 are realized.

[0069] The device embodiments described above are only schematic. Among them, the units described as the above-mentioned discrete components may or may not be physically separated. The components represented as units may or may not be physical units, that is, they may be located in one place or distributed and located in multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the present embodiment solution.

[0070] From the description of the above embodiments, it is obvious to those skilled in the art that each embodiment may be realized by adding a general-purpose hardware platform to software, and of course, it may also be realized by hardware. It is understandable to those skilled in the art that the realization of all or part of the flow in the above method embodiments is achieved by a computer program giving instructions to related hardware. The above program may be stored in a computer-readable storage medium. When this program is executed, it may include a flow like the embodiments of the above methods. Among them, the above storage medium may be a magnetic disk, an optical disk, a read-only memory (ROM), or a random access memory (RAM), etc.

[0071] Finally, it is explained that the above embodiments are only for explaining the technical solutions of this application and do not limit it. Under the gist of this application, the technical features in the above embodiments or different embodiments can be combined with each other, and the steps can be realized by any procedure. Also, there are many other changes in different aspects of this application as described above, but for the sake of simplicity of description, they are not provided in detail. The present application has been described in detail with reference to the above embodiments. As should be understood by those skilled in the art, still, the technical solutions described in each of the above embodiments can be modified, or some of the technical features therein can be equivalently replaced, and these modifications or replacements do not substantially deviate the corresponding technical solutions from the scope of the technical solutions of each embodiment of this application.

Claims

1. An SOC estimation method applied to a mobile power supply, comprising: Step S1. Calculating a value of the amount of electricity of a fixed step size of the mobile power supply; Step S2. Sequentially and stepwise superimposing the unit amount of electricity to calculate the cumulative amount of electricity from the time point of the previous change in SOC of the mobile power supply; Step S3. Comparing the absolute value of the cumulative amount of electricity with the value of the amount of electricity of the fixed step size, and performing addition and subtraction based on the comparison result to obtain the current SOC value and the start value of the cumulative amount of electricity at the next time point; Step S4. After the SOC value is updated, if the cumulative amount of electricity continues to change, steps S2 - S3 are cycled, and if the cumulative amount of electricity does not change, the SOC value at the previous time point is retained, and the current cumulative amount of electricity is saved, including: The step S3 includes: When the absolute value of the cumulative amount of electricity is greater than or equal to the value of the amount of electricity of the fixed step size, when the mobile power supply is in a charging state, adding the fixed step size to the SOC value at the previous time point to obtain the current SOC value, and subtracting the value of the amount of electricity of the fixed step size from the cumulative amount of electricity to obtain the start value of the cumulative amount of electricity at the next time point; when the mobile power supply is in a discharging state, subtracting the fixed step size from the SOC value at the previous time point to obtain the current SOC value, and adding the value of the amount of electricity of the fixed step size to the cumulative amount of electricity to obtain the start value of the cumulative amount of electricity at the next time point; When the absolute value of the cumulative amount of electricity is less than the value of the amount of electricity of the fixed step size, retaining the SOC value at the previous time point as the current SOC value, and saving the cumulative amount of electricity as the start value of the cumulative amount of electricity at the next time point. An SOC estimation method is characterized by including the above.

2. The step S1 includes: Obtaining the value of the amount of electricity of the fixed step size of the mobile power supply from the first formula, where the first formula is as follows: Here, ΔC is the value of the amount of electricity with a fixed step size, C is the rated capacity of the battery of the mobile power supply, P is the fixed step size, λ is a proportional coefficient that varies with the ambient temperature, and I ｍａｘ is the maximum overcurrent value that the mobile power supply can withstand in an extreme case, and T ２ is the calculation period of the SOC of the mobile power supply, and the method according to claim 1 is characterized by this.

3. The step S2 includes: Calculating the unit amount of electricity from the second formula, and Calculating the cumulative amount of electricity from the time point of the previous change in SOC of the mobile power supply from the third formula, where the second formula is as follows: ； The third formula is as follows: Here, I ｎ１ , I ｎ２ ,..., I ｎｋ is the sampling current at the k-th sampling period within the calculation period of the n-th SOC, T １ is the sampling period, T ２ is the calculation period of the SOC, Q st represents the starting value of the cumulative charge amount, and N is a positive integer. The method according to claim 1, characterized in that.

4. The step S2 includes: Calculating the unit amount of electricity from the second formula, and calculating the cumulative charge amount from the time of change of the previous SOC of the mobile power supply from the third equation, wherein the second equation is as follows: The third equation is as follows: Here,[[]]END]] where j is a positive integer, and I ｎ１ , I ｎ２ ,..., I ｎｋ is the sampling current of the k-th sampling period within the calculation period of the n-th SOC respectively, T １ is the sampling period, T ２ is the calculation period of the SOC, Q st represents the starting value of the cumulative charge amount, and N is a positive integer. The method according to claim 1, characterized in that. [

5. ] The method according to claim 1, further comprising correcting the current SOC value obtained in step S3 at the charge and discharge end stage of the mobile power supply. [

6. ] Correcting the SOC of the mobile power supply at the charge and discharge end stage of the mobile power supply as described above includes introducing a correction process when the following two requirements are met during charging of the mobile power supply The voltage U of the mobile power source is greater than the threshold value U of the charging terminal voltage ｕｐ and the SOC value of the mobile power supply does not reach full charge The correction formula is as follows: Here, SOC' is the corrected SOC value during charging, SOC is the SOC value before correction, and α is the charging correction parameter. The method according to claim 5 is characterized in that. [

7. ] Correcting the SOC of the mobile power supply at the charge and discharge end stage of the mobile power supply as described above includes introducing a correction process when the following two requirements are met during discharging of the mobile power supply The voltage U of the mobile power supply is smaller than the threshold value U of the discharge end voltage ｄｅ than that, the SOC value of the mobile power supply does not become empty The correction formula is as follows: Here, SOC'' is the corrected SOC value during discharging, SOC is the SOC value before correction, and β is the discharging correction parameter. The method according to claim 5 is characterized in that. [

8. ] A mobile power supply comprising at least one processor and a memory communicatively connected to the at least one processor, wherein commands executable by the at least one processor are stored in the memory, the commands are executed by the at least one processor, and the at least one processor can execute the method according to any one of claims 1 to 7. A mobile power supply characterized by that. [

9. ] A readable storage medium storing computer-executable commands, wherein the computer-executable commands are used to cause a computer to execute the method according to any one of claims 1 to 7. A readable storage medium characterized by that.

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