Battery pack SOC correction control method and device

Abstract

The present invention discloses a battery pack SOC correction control method and device. The method includes: obtaining a first capacity threshold, a second capacity threshold, the battery pack SOC at power-off, the range of the platform area, and the operating throughput of the battery pack; if the operating throughput is greater than or equal to the first capacity threshold and less than the second capacity threshold, correcting the battery pack SOC when the battery pack is fully charged; if the operating throughput is greater than or equal to the second capacity threshold, determining whether the battery pack SOC at power-off is within the range of the platform area; if the battery pack SOC at power-off is within the range of the platform area, discharging the battery pack to the non-platform area and correcting the battery pack SOC; if the battery pack SOC at power-off is outside the range of the platform area, correcting the battery pack SOC. The above method is conducive to eliminating battery pack SOC estimation errors and improving the estimation accuracy of battery pack SOC.

Description

Technical Field

[0001] The present invention relates to the technical field of battery packs, and in particular to a battery pack SOC correction control method and device. Background Art

[0002] Lithium iron phosphate batteries (LiFePO4) are widely used in electric vehicles due to their high safety, long lifespan, and relatively low cost. However, accurately estimating the state of charge (SOC) of LiFePO4 batteries has always been a challenge, especially within a specific charge range.

[0003] The SOC estimation method based on OCV (Open Circuit Voltage) is a commonly used battery SOC estimation technique. The OCV is the voltage measured after the battery current returns to zero and the battery voltage fully rebounds after continuous charge and discharge.

[0004] There is an inherent relationship between OCV and SOC (State of charge), which can be calibrated through experimental data and plotted as an OCV-SOC curve. For different types of batteries, the characteristics of their OCV-SOC curves are different. The OCV-SOC curve of the lithium iron phosphate battery varies greatly in the two end areas (such as SOC <25% and SOC>95%), but is relatively flat in the middle area (such as SOC between 30% and 90%). This means that the middle area of ​​SOC is the platform area of ​​the lithium iron phosphate battery. Even if the SOC changes significantly in the platform area, the change in OCV may be very small, resulting in a large error in the battery's SOC estimation and low accuracy in the battery's SOC estimation. Summary of the Invention

[0005] The present invention provides a battery pack SOC correction control method and device to eliminate battery pack SOC estimation errors and improve battery pack SOC estimation accuracy.

[0006] According to one aspect of the present invention, a battery pack SOC correction control method is provided, wherein the battery pack includes a plurality of lithium-ion batteries; the battery pack SOC correction control method includes:

[0007] Obtain a first capacity threshold, a second capacity threshold, the battery pack SOC at the time of power-off, a platform area range, and an operating throughput of the battery pack; wherein the first capacity threshold and the second capacity threshold are both preset operating throughput threshold values, the first capacity threshold is less than the second capacity threshold, and the operating throughput is the sum of the accumulated charging and discharging amounts of the battery pack when operating in the platform area from the last battery pack SOC correction to the current power-off of the power-consuming device; the platform area range is the SOC range of the battery pack in the platform area; and the battery pack SOC at the time of power-off is the battery pack SOC of the power-consuming device at the time of the current power-off.

[0008] If the operating throughput is greater than or equal to the first capacity threshold and less than the second capacity threshold, correcting the battery pack SOC when the battery pack is in a fully charged state;

[0009] If the operating throughput is greater than or equal to the second capacity threshold, determining whether the battery pack SOC at the power-off moment is within the platform range;

[0010] If the battery pack SOC at the power-off moment is within the platform range, discharging the battery pack to the non-platform range and correcting the battery pack SOC;

[0011] If the battery pack SOC at the power-off moment is outside the platform range, the battery pack SOC is corrected.

[0012] Optionally, the plateau region range includes: an interval close to a non-plateau region, the interval close to the non-plateau region being an SOC interval with a minimum boundary value of the plateau region range as an interval minimum value, and a maximum value of the interval close to the non-plateau region being less than a maximum boundary value of the plateau region range; before discharging the battery pack to the non-plateau region and correcting the battery pack SOC, the method further includes:

[0013] Determining whether the battery pack SOC at the power-off moment is within the close-to-non-platform range;

[0014] If the battery pack SOC at the power-off time is within the range close to the non-platform region, discharging the battery pack to the non-platform region and correcting the battery pack SOC;

[0015] If the SOC of the battery pack at the power-off moment is outside the near-non-platform range, the battery pack is controlled to hibernate.

[0016] Optionally, the platform area range includes: a common platform area interval, wherein the common platform area interval is an SOC interval with a maximum boundary value of the platform area range as an interval maximum value, and a minimum value of the common platform area interval is greater than a minimum boundary value of the platform area range; before determining whether the battery pack SOC at the power-off moment is within the platform area range, the method further includes:

[0017] Determining whether the battery pack SOC at the power-off moment is within the normal platform range;

[0018] If the battery pack SOC at the power-off moment is within the normal platform range, controlling the battery pack to hibernate;

[0019] If the battery pack SOC at the power-off time is outside the normal platform range, it is determined whether the battery pack SOC at the power-off time is within the platform range.

[0020] Optionally, the specific method of discharging the battery pack includes:

[0021] Obtaining the current temperature of the battery pack and the optimal temperature range of the battery pack;

[0022] If the current temperature is lower than a minimum value of the optimal temperature range of the battery pack, heating the battery pack to consume the electric energy of the battery pack;

[0023] If the current temperature is greater than a maximum value of the optimal temperature range of the battery pack, cooling the battery pack to consume electrical energy of the battery pack;

[0024] If the current temperature is greater than or equal to a minimum value of the optimal temperature range of the battery pack and less than or equal to a maximum value of the optimal temperature range of the battery pack, a heating and cooling cycle is performed on the battery pack to consume electrical energy of the battery pack.

[0025] Optionally, the specific method for correcting the battery pack SOC includes:

[0026] Obtaining an open circuit voltage of the battery pack and an OCV-SOC curve of the battery pack;

[0027] Determining the actual SOC of the battery pack at a current moment according to the open circuit voltage of the battery pack and the OCV-SOC curve of the battery pack;

[0028] The actual SOC of the battery pack at the current moment is used as the battery pack SOC of the battery pack at the current moment.

[0029] Optionally, the specific method for correcting the SOC of the battery pack when the battery pack is in a fully charged state includes:

[0030] Prompting the user to fully charge the battery pack;

[0031] If the user fully charges the battery pack, the SOC of the battery pack when it is in a fully charged state is assigned to 100% to correct the SOC of the battery pack when it is in a fully charged state;

[0032] If the user has not fully charged the battery pack, the user is continuously prompted to fully charge the battery pack.

[0033] Optionally, the specific method of discharging the battery pack to a non-platform region and correcting the SOC of the battery pack includes:

[0034] The battery pack is discharged within a preset time, and the battery pack SOC is corrected when the battery pack SOC is less than or equal to a minimum boundary value of the platform range.

[0035] Optionally, the specific method of discharging the battery pack within a preset time includes:

[0036] Get the current time and the preset time;

[0037] Calculate the timing duration according to the current time and the preset time and perform a countdown;

[0038] After the countdown of the timing duration ends, the battery pack is discharged.

[0039] Optionally, after correcting the battery pack SOC, the method further includes:

[0040] Clear the throughput of the run to zero.

[0041] According to another aspect of the present invention, a battery pack SOC correction control device is provided, the battery pack SOC correction control device comprising:

[0042] An acquisition module is configured to acquire a first capacity threshold, a second capacity threshold, the battery pack SOC at the time of power-off, a platform area range, and an operating throughput of the battery pack; wherein the first capacity threshold and the second capacity threshold are both preset operating throughput threshold values, the first capacity threshold is less than the second capacity threshold, and the operating throughput is the sum of the accumulated charging and discharging amounts of the battery pack during operation in the platform area from the last battery pack SOC correction to the current power-off of the power-consuming device; the platform area range is the SOC range of the battery pack in the platform area; and the battery pack SOC at the time of power-off is the battery pack SOC of the power-consuming device at the time of the current power-off.

[0043] a full-charge correction module, configured to correct the battery pack SOC when the battery pack is in a fully-charged state if the operating throughput is greater than or equal to the first capacity threshold and less than the second capacity threshold;

[0044] a modified judgment module, configured to judge whether the battery pack SOC at the power-off moment is within the platform range if the operating throughput is greater than or equal to the second capacity threshold;

[0045] a first correction module, configured to discharge the battery pack to a non-platform area and correct the battery pack SOC if the battery pack SOC at the power-off moment is within the platform area;

[0046] The second correction module is configured to correct the battery pack SOC if the battery pack SOC at the power-off moment is outside the platform range.

[0047] According to yet another aspect of the present invention, there is provided an electronic device, comprising:

[0048] at least one processor; and

[0049] a memory communicatively connected to the at least one processor; wherein,

[0050] The memory stores a computer program that can be executed by the at least one processor. The computer program is executed by the at least one processor to enable the at least one processor to execute the battery pack SOC correction control method described in any of the above embodiments.

[0051] According to another aspect of the present invention, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a processor to implement the battery pack SOC correction control method described in any of the above embodiments when executed.

[0052] The embodiment of the present invention determines whether the battery pack SOC needs to be corrected based on the operating throughput, first capacity threshold, and second capacity threshold of the battery pack; when the operating throughput is greater than or equal to the first capacity threshold and less than the second capacity threshold, the battery pack SOC is corrected when the battery pack is in a fully charged state; when the operating throughput is greater than or equal to the second capacity threshold, whether the battery pack is in the platform area is determined based on the battery pack SOC at the time of power-off and the platform area range; when the battery pack is in the platform area, the battery pack is discharged to place the battery pack in the non-platform area, thereby correcting the battery pack SOC. The embodiment of the present invention determines whether the battery pack SOC needs to be corrected based on the accumulated operating throughput of the battery pack, and controls the battery pack SOC to be in the non-platform area when the battery pack SOC needs to be corrected to achieve correction of the battery pack SOC, which is beneficial for eliminating battery pack SOC estimation errors and improving the estimation accuracy of the battery pack SOC.

[0053] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present invention, nor is it intended to limit the scope of the present invention. Other features of the present invention will become readily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0055] Figure 1 This is a flow chart of a battery pack SOC correction control method provided by the first embodiment of the present invention;

[0056] Figure 2 is a graph of an open circuit voltage-state of charge curve provided by an embodiment of the present invention;

[0057] Figure 3 This is a flow chart of a battery pack SOC correction control method provided by the second embodiment of the present invention;

[0058] Figure 4 This is a flow chart of a battery pack SOC correction control method provided by the third embodiment of the present invention;

[0059] Figure 5 This is a flow chart of a battery pack SOC correction control method provided by the fourth embodiment of the present invention;

[0060] Figure 6 This is a flow chart of a battery pack SOC correction control method provided by the fifth embodiment of the present invention;

[0061] Figure 7 This is a flow chart of a battery pack SOC correction control method provided by Example 6 of the present invention;

[0062] Figure 8 1 is a schematic diagram of a battery pack SOC correction control device provided by a seventh embodiment of the present invention;

[0063] Figure 9 This is a structural diagram of an electronic device provided in Example 8 of the present invention. DETAILED DESCRIPTION

[0064] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0065] It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0066] Example 1

[0067] Figure 1 This is a flow chart of a battery pack SOC correction control method provided by the first embodiment of the present invention. The battery pack SOC correction control method determines whether the battery pack SOC needs to be corrected based on the accumulated operating throughput of the battery pack, and controls the battery pack SOC to be in a non-platform area when the battery pack SOC needs to be corrected, so as to achieve the correction of the battery pack SOC, which is conducive to eliminating the battery pack SOC estimation error and improving the estimation accuracy of the battery pack SOC. The battery pack includes multiple lithium-ion batteries. Figure 1 , the battery pack SOC correction control method includes:

[0068] S110. Obtain the first capacity threshold, the second capacity threshold, the battery pack SOC (State of Charge) at the time of power-off, the platform area range, and the operating throughput of the battery pack; wherein the first capacity threshold and the second capacity threshold are both preset operating throughput thresholds, the first capacity threshold is less than the second capacity threshold, and the operating throughput is the sum of the accumulated charging and discharging power of the battery pack during operation in the platform area from the last time the battery pack SOC was corrected to the current power-off of the power-consuming device; the platform area range is the SOC range of the battery pack in the platform area; the battery pack SOC at the time of power-off is the battery pack SOC of the power-consuming device at the time of power-off. It should be noted that the power-off time refers to the moment when the connection between the battery pack and the power-consuming device is cut off. At this time, the battery pack does not discharge externally, the battery management system in the battery pack is in an active state, and the battery pack is not in hibernation.

[0069] Specifically, operating throughput represents the sum of the accumulated charge and discharge energy of the battery pack during operation in the platform zone, from the last battery pack SOC correction to the current power-off of the powered device. It reflects the actual usage and energy flow of the battery pack during the period from the last battery pack SOC correction to the current power-off of the powered device. The platform zone is the area where the battery pack exhibits relatively stable performance within a specific operating range. The platform zone range is used to distinguish different operating states of the battery pack. The battery pack SOC at the time of power-off is the battery pack SOC of the powered device at the time of power-off, reflecting the remaining charge state of the battery pack when the device stops operating. It should be noted that the first capacity threshold and the second capacity threshold are related to the characteristics of the battery pack itself. The first capacity threshold and the second capacity threshold may be different for the same battery pack. In actual applications, the first capacity threshold and the second capacity threshold can be set according to actual needs, and this embodiment does not impose any restrictions on this. For example, the first capacity threshold can be five times the nominal capacity of the battery pack, and the second capacity threshold can be ten times the nominal capacity of the battery pack.

[0070] S120. Determine the relationship between the first capacity threshold, the second capacity threshold, and the operating throughput; if the operating throughput is less than the first capacity threshold, execute S130; if the operating throughput is greater than or equal to the first capacity threshold and less than the second capacity threshold, execute S140; if the operating throughput is greater than or equal to the second capacity threshold, execute S150.

[0071] Specifically, when the operating throughput is greater than or equal to the first capacity threshold and less than the second capacity threshold, it is considered that the cumulative error of the battery pack SOC collection has affected the collection accuracy of the battery pack SOC. At this time, the cumulative error of the battery pack SOC needs to be eliminated, but the error between the collected battery pack SOC and the actual battery pack SOC is relatively small at this time. The cumulative error of the battery pack SOC can be eliminated when the battery pack is fully charged or the battery pack is in a non-platform area due to daily use; when the operating throughput is less than the first capacity threshold, it is considered that the cumulative error of the battery pack SOC collection has little effect on the collection accuracy of the battery pack SOC and can be ignored, or even no error; when the operating throughput is greater than or equal to the second capacity threshold, it is considered that the cumulative error of the battery pack SOC collection has a greater impact on the collection accuracy of the battery pack SOC. At this time, the battery pack needs to be discharged to put the battery pack in a non-platform area, and then the battery pack SOC is corrected to eliminate the cumulative error of the battery pack SOC.

[0072] S130 , controlling the battery pack to sleep.

[0073] S140 , correcting the battery pack SOC when the battery pack is in a fully charged state.

[0074] S150 , determining whether the battery pack SOC at the time of power-off is within the platform range; if not, executing S160 ; if so, executing S170 .

[0075] Specifically, when the battery pack SOC at power-off is within the plateau range, it indicates that the battery pack is in the plateau region; when the battery pack SOC at power-off is outside the plateau range, it indicates that the battery pack is in the non-plateau region. It should be noted that the plateau ranges of different types of battery packs vary. In actual applications, the plateau range of the battery pack can be determined based on the characteristics of the battery pack itself, and this embodiment does not impose any restrictions on this.

[0076] Figure 2 This is a graph of an open circuit voltage-state of charge curve provided by an embodiment of the present invention. Figure 2It can be seen from the curve shown that there is a flat area in the change of the SOC of the battery pack (the area shown by point B-point C), and the flat area is the platform area of ​​the battery pack. In the platform area, the state of charge of the battery pack changes less with the open circuit voltage. At this time, the accuracy of the state of charge estimated by the battery pack based on the open circuit voltage is low. In addition, there are two steep areas in the change of the SOC of the battery pack, namely (the area shown by point A-point B) and (the area shown by point C-point D). The steep areas at both ends are the two non-platform areas of the battery pack. In the non-platform area, the state of charge of the battery pack changes more with the open circuit voltage. At this time, the accuracy of the state of charge estimated by the battery pack based on the open circuit voltage is high. Therefore, when correcting the battery pack SOC, it is necessary to ensure that the battery pack is in the non-platform area. Among them, refer to Figure 2 The platform area range is the interval between the SOC corresponding to point B and the SOC corresponding to point C.

[0077] S160: Correct the battery pack SOC.

[0078] Specifically, when the battery pack SOC at the moment of power-off is outside the platform area, it indicates that the battery pack is in the non-platform area. At this time, the open circuit voltage of the battery pack changes greatly. Therefore, the battery pack SOC can be directly corrected according to the open circuit voltage of the battery pack.

[0079] S170: Discharge the battery pack to a non-platform area and correct the battery pack SOC.

[0080] Specifically, when the battery pack SOC at the moment of power-off is within the plateau range, it indicates that the battery pack is in the plateau range. At this time, the open-circuit voltage of the battery pack is relatively stable. Therefore, when correcting the battery pack SOC, the battery pack needs to be discharged to the non-plateau range to significantly change the open-circuit voltage of the battery pack, thereby correcting the battery pack SOC. A specific method for discharging the battery pack may be to discharge the battery pack at a preset time, where the preset time is a pre-set battery pack discharge time. In actual applications, the preset time can be set according to actual needs and is not limited in this embodiment. For example, the preset time may be 1:00 AM. When discharging the battery pack, the current time and the preset time are obtained. For example, the current time may be obtained from the network. A timer duration is calculated based on the current time and the preset time, and a countdown is performed. The time difference between the current time and the preset time is the timer duration. After the countdown for the timer duration ends, the battery pack is discharged until the battery pack SOC is less than or equal to the minimum boundary value of the plateau range.

[0081] The embodiment of the present invention determines whether the battery pack SOC needs to be corrected based on the operating throughput, first capacity threshold, and second capacity threshold of the battery pack; when the operating throughput is greater than or equal to the first capacity threshold and less than the second capacity threshold, the battery pack SOC is corrected when the battery pack is in a fully charged state; when the operating throughput is greater than or equal to the second capacity threshold, whether the battery pack is in the platform area is determined based on the battery pack SOC at the time of power-off and the platform area range; when the battery pack is in the platform area, the battery pack is discharged to place the battery pack in the non-platform area, thereby correcting the battery pack SOC. The embodiment of the present invention determines whether the battery pack SOC needs to be corrected based on the accumulated operating throughput of the battery pack, and controls the battery pack SOC to be in the non-platform area when the battery pack SOC needs to be corrected to achieve correction of the battery pack SOC, which is beneficial for eliminating battery pack SOC estimation errors and improving the estimation accuracy of the battery pack SOC.

[0082] Example 2

[0083] Figure 3 This is a flow chart of a battery pack SOC correction control method provided in Example 2 of the present invention. The platform area range includes: an interval close to the non-platform area, an SOC interval with the minimum boundary value of the platform area range as the interval minimum value, and an interval maximum value of the interval close to the non-platform area less than the maximum boundary value of the platform area range; before discharging the battery pack to the non-platform area and correcting the battery pack SOC, the battery pack SOC at the time the electrical device is powered off is determined based on the interval close to the non-platform area to determine whether it is close to the non-platform area of ​​the battery pack.

[0084] In this embodiment, before discharging the battery pack to the non-platform area and correcting the battery pack SOC, it is further determined whether the battery pack should be discharged and corrected based on the battery pack SOC to avoid wasting the battery pack power. Specifically, if the battery pack SOC at the time the electric device is powered off is within the range close to the non-platform area, the battery pack is discharged to the non-platform area and the battery pack SOC is corrected; if the battery pack SOC at the time the electric device is powered off is outside the range close to the non-platform area, the battery pack is controlled to sleep. The range close to the non-platform area is a pre-set judgment range for determining whether the battery pack SOC is close to the non-platform area. The range close to the non-platform area can be set with reference to the minimum boundary value of the platform area range. The range size close to the non-platform area can be set according to the actual application situation. This embodiment does not limit this. For example, continue to refer to Figure 2The interval close to the non-plateau region is the interval between the SOC corresponding to point B and the SOC corresponding to point E. The minimum boundary value of the plateau region is the SOC corresponding to point B. It should be noted that when the battery pack SOC is greater than the minimum value of the interval close to the non-plateau region (i.e., the SOC corresponding to point B) and less than the maximum value of the interval close to the non-plateau region (i.e., the SOC corresponding to point E), the battery pack is considered to be in the interval close to the non-plateau region.

[0085] On the basis of the above embodiment, optionally, referring to Figure 3 Before discharging the battery pack to the non-platform area and correcting the battery pack SOC, the process also includes: S171, determining whether the battery pack SOC at the time of power-off is within a range close to the non-platform area; if so, executing S170; if not, executing S172.

[0086] Specifically, the SOC of the battery pack at the time when the electric device is powered off represents the amount of electricity in the battery pack of the electric device at the time when the electric device is powered off. When the battery pack SOC at the moment the electric device is powered off is within a range close to the non-platform area (the battery pack SOC at the moment the electric device is powered off is greater than the SOC corresponding to point B and less than the SOC corresponding to point E), it indicates that the battery pack power is relatively low at the moment the electric device is powered off. At this time, the battery pack power is close to the minimum boundary value of the platform area (the SOC corresponding to point B), that is, close to the non-platform area of ​​the battery pack; when the battery pack SOC at the moment the electric device is powered off is outside the range close to the non-platform area (the battery pack SOC at the moment the electric device is powered off is greater than or equal to the SOC corresponding to point E and less than or equal to the SOC corresponding to point C), it indicates that the battery pack power is high at the moment the electric device is powered off, and the battery pack power is sufficient. If the battery pack is discharged to the non-platform area when the battery pack power is sufficient, a large amount of power will be consumed. Therefore, when the battery pack SOC at the moment the electric device is powered off is within the platform area but not within a range close to the non-platform area, the battery pack is not discharged and corrected to avoid wasting the battery pack power.

[0087] S170: Discharge the battery pack to a non-platform area and correct the battery pack SOC.

[0088] Specifically, the battery pack is discharged at a preset time, and the battery pack SOC is corrected when the battery pack SOC is less than or equal to the minimum boundary value of the plateau range (the SOC corresponding to point B). When the battery pack SOC at the time the electrical device is powered off is close to the non-plateau range (between the SOC corresponding to point B and the SOC corresponding to point E), the battery pack's charge level is low and near the minimum boundary value of the plateau range (the SOC corresponding to point B). Discharging the battery pack can reduce the battery pack's charge level to bring it into the non-plateau range. The preset time is a pre-set battery pack discharge time. In practical applications, the preset time can be set based on actual needs, and this embodiment does not impose any restrictions. For example, the preset time can be 1:00 AM. When the battery pack SOC of the electrical device is close to the non-plateau range at the time the electrical device is powered off, the current time and the preset time are obtained. For example, the current time can be obtained from the network. A countdown is calculated based on the current time and the preset time, and a countdown is performed. The time difference between the current time and the preset time is the countdown. After the countdown ends, the battery pack is discharged until the battery pack SOC is less than or equal to the minimum boundary value of the platform area.

[0089] The battery pack can be discharged by heating or cooling the battery pack. During discharge, the current battery pack temperature and the optimal temperature range of the battery pack can be obtained. The optimal temperature range represents the optimal operating temperature range for the battery pack. The discharge method is determined based on the current battery pack temperature and the optimal temperature range. When the current temperature is less than the minimum value of the optimal temperature range, the battery pack is heated to raise the temperature to within the optimal temperature range, thereby consuming the battery pack's energy and discharging the battery pack. When the current temperature is greater than the maximum value of the optimal temperature range, the battery pack is cooled to lower the temperature to within the optimal temperature range, thereby consuming the battery pack's energy and discharging the battery pack. If the battery pack temperature rises or falls within the optimal temperature range and remains in the plateau region, a heating and cooling cycle is repeated to continue discharging the battery pack, ensuring that the battery pack can be discharged into the non-plateau region.

[0090] When the current temperature is greater than or equal to the minimum value of the optimal temperature range of the battery pack and less than or equal to the maximum value of the optimal temperature range of the battery pack, the battery pack is heated and cooled in a cycle to consume the electrical energy of the battery pack. When the battery pack is heated or cooled, the temperature of the battery pack is always maintained within the optimal temperature range of the battery pack, that is, the highest temperature of the battery pack when heated is always less than or equal to the maximum value of the optimal temperature range of the battery pack, and the lowest temperature of the battery pack when cooled is always less than or equal to the minimum value of the optimal temperature range of the battery pack. For example, the discharge mode of the battery pack when the cycle starts can be determined based on the current temperature of the battery pack and the median value of the optimal temperature range of the battery pack. When the current temperature of the battery pack is less than the median value of the optimal temperature range of the battery pack, the cycle starts by heating the battery pack; when the current temperature of the battery pack is greater than or equal to the median value of the optimal temperature range of the battery pack, the cycle starts by cooling the battery pack.

[0091] S172: Control the battery pack to sleep.

[0092] For example, in actual application, the battery pack can be put into a dormant state by disconnecting the battery pack from the electrical device.

[0093] Example 3

[0094] Figure 4 This is a flow chart of a battery pack SOC correction control method provided by Example 3 of the present invention. The platform range includes: a normal platform range interval, which is an SOC range with the maximum boundary value of the platform range as the interval maximum value, and the minimum value of the normal platform range interval is greater than the minimum boundary value of the platform range.

[0095] In this embodiment, before determining whether the battery pack SOC at the time of power-off is within the platform area, it is also determined whether the battery pack is within the ordinary platform area based on the battery pack SOC at the time of power-off of the power-consuming device. Specifically, if the battery pack SOC at the time of power-off of the power-consuming device is within the ordinary platform area, the battery pack is controlled to hibernate; if the battery pack SOC at the time of power-off of the power-consuming device is outside the ordinary platform area, it is determined whether the battery pack SOC at the time of power-off is within the platform area. It should be noted that the ordinary platform area can be set with reference to the maximum boundary value of the platform area range, and the size of the ordinary platform area can be set according to the actual application situation. This embodiment does not limit this. For example, continue to refer to Figure 2The normal plateau range is the interval between the SOC corresponding to point E and the SOC corresponding to point C, and the maximum boundary value of the plateau range is the SOC corresponding to point C. It should be noted that when the battery pack SOC is greater than the minimum value of the normal plateau range (i.e., the SOC corresponding to point E) and less than the maximum value of the normal plateau range (i.e., the SOC corresponding to point C), the battery pack is considered to be in the normal plateau range.

[0096] On the basis of the above embodiments, optionally, referring to Figure 4 Before determining whether the battery pack SOC at the time of power-off is within the platform range, the following steps are also included:

[0097] S151. Determine whether the battery pack SOC at the time of power-off is within the normal platform range; if so, execute S152; if not, execute S150.

[0098] Specifically, the battery pack SOC at the moment the power-consuming device is powered off represents the charge level of the battery pack at that moment. When the battery pack SOC at that moment is greater than the SOC corresponding to point E and less than the SOC corresponding to point C, it indicates that the battery pack SOC at that moment is within the normal platform range, indicating that the battery pack has a high charge level and sufficient charge. Discharging the battery pack to a non-platform range when the battery pack has sufficient charge consumes a significant amount of power. Therefore, when the battery pack SOC at that moment is within the normal platform range, the battery pack is not discharged to avoid wasting the battery pack's charge.

[0099] S151. Control the battery pack to sleep.

[0100] S150: Determine whether the battery pack SOC at the time of power-off is within the platform range.

[0101] Specifically, since the normal platform area is an SOC area with the maximum boundary value of the platform area as the maximum value of the area, when the battery pack SOC at the time of power-off is outside the normal platform area, the battery pack SOC at this time may be within the platform area or outside the platform area. Figure 2When the battery pack SOC at this time is less than the SOC corresponding to point B or the battery pack SOC at this time is greater than the SOC corresponding to point C, it indicates that the battery pack is outside the platform area and is in the non-platform area. The open circuit voltage of the battery pack changes significantly, and the battery pack SOC can be directly corrected. When the battery pack SOC at this time is greater than the SOC corresponding to point B and the battery pack SOC at this time is less than the SOC corresponding to point E, it indicates that the battery pack is within the platform area and is in the platform area. The open circuit voltage of the battery pack changes relatively insignificantly, and the battery pack needs to be discharged to put the battery pack in the non-platform area, so as to correct the battery pack SOC.

[0102] It should be noted that, in combination with Example 2, in actual application, the platform area range can be composed of an interval close to the non-platform area and an ordinary platform area interval. The interval close to the non-platform area is an SOC interval with the minimum boundary value of the platform area range as the interval minimum value. The ordinary platform area interval is an SOC interval in the platform area range except the area close to the non-platform area. The maximum value of the interval close to the non-platform area is the minimum value of the ordinary platform area interval, and the maximum boundary value of the platform area range is the maximum value of the ordinary platform area interval. Before discharging the battery pack to the non-platform area and correcting the battery pack SOC, determine whether the battery pack SOC at the time of power-off of the electrical equipment is close to the non-platform area of ​​the battery pack based on the interval close to the non-platform area.

[0103] Example 4

[0104] Figure 5 This is a flow chart of a battery pack SOC correction control method provided in Example 4 of the present invention. In this embodiment, the steps for correcting the battery pack SOC are further specified as follows: obtaining the open circuit voltage of the battery pack and the OCV-SOC curve (open circuit voltage-state of charge curve) of the battery pack; determining the actual SOC of the battery pack at the current moment based on the open circuit voltage and the OCV-SOC curve; and using the actual SOC of the battery pack at the current moment as the battery pack SOC at the current moment.

[0105] On the basis of the above embodiments, optionally, referring to Figure 5 , the specific methods for correcting the battery pack SOC include:

[0106] S161. Obtain the open circuit voltage of the battery pack and the OCV-SOC curve of the battery pack.

[0107] Specifically, the open circuit voltage of a battery pack refers to the potential difference between the positive and negative electrodes when the battery pack is in the open circuit state. The open circuit voltage of a battery pack can intuitively reflect the current state of the battery pack. The battery pack's OCV-SOC curve characterizes the changes in the battery pack's state of charge at different open circuit voltages. Different open circuit voltages of the battery pack correspond to different states of charge.

[0108] S162: Determine the actual SOC of the battery pack at the current moment according to the open circuit voltage of the battery pack and the OCV-SOC curve of the battery pack.

[0109] Specifically, the open-circuit voltage of a battery pack in the OCV-SOC curve corresponds to the state of charge. Therefore, when determining the open-circuit voltage of a battery pack, the point corresponding to that open-circuit voltage on the OCV-SOC curve can be used to obtain the battery pack's SOC. Based on the open-circuit voltage of the battery pack, the SOC corresponding to that open-circuit voltage is determined on the OCV-SOC curve. This SOC corresponding to the open-circuit voltage of the battery pack is the actual SOC of the battery pack at that moment.

[0110] S163: Use the actual SOC of the battery pack at the current moment as the battery pack SOC of the battery pack at the current moment.

[0111] Specifically, since the battery pack is in the non-platform area at this time, the OCV-SOC curve of the battery pack changes significantly in the non-platform area, and the SOC corresponding to the open circuit voltage of the battery pack in the non-platform area is more accurate. Therefore, the actual SOC of the battery pack determined according to the open circuit voltage is also more accurate. The actual SOC of the battery pack at the current moment is used as the battery pack SOC of the battery pack at the current moment to realize the correction of the battery pack SOC.

[0112] It should be noted that the above method can also be used to correct the battery pack SOC after the battery pack is discharged to the non-platform area. In the process of correcting the battery pack SOC, the battery pack is discharged to the non-platform area, which is essentially no different from the battery pack being in the non-platform area at the moment of power-off. As long as the SCO of the battery pack is in the non-platform area when the correction is performed, the correction can be achieved by the above method.

[0113] Example 5

[0114] Figure 6 This is a flow chart of a battery pack SOC correction control method provided in Example 5 of the present invention. In this embodiment, the correction of the battery pack SOC when the battery pack is fully charged is further specified as follows: prompting the user to fully charge the battery pack; if the user fully charges the battery pack, assigning the battery pack SOC at full charge to 100% to correct the battery pack SOC at full charge; if the user does not fully charge the battery pack, then continuing to prompt the user to fully charge the battery pack.

[0115] On the basis of the above embodiments, optionally, referring to Figure 6 , the specific method of correcting the battery pack SOC when the battery pack is in a fully charged state includes:

[0116] S141. Prompt the user to fully charge the battery pack.

[0117] For example, the user may be prompted through an electrical device or through a terminal, wherein the terminal may be a mobile phone.

[0118] S142. Determine whether the user has fully charged the battery pack; if so, execute S143; if not, execute S141.

[0119] Specifically, the battery pack's full charge status is detected. When the battery pack is fully charged, it indicates that the user has fully charged the battery pack, and the battery pack SOC is corrected. When the battery pack is not fully charged, it indicates that the user has not fully charged the battery pack, and the user is prompted to fully charge the battery pack. It should be noted that in actual applications, different policies can be set for situations where the battery pack is not fully charged, such as controlling the battery pack to sleep, based on application needs. This embodiment does not limit this.

[0120] S143 . Assign the SOC of the battery pack when it is in a fully charged state to 100% to correct the SOC of the battery pack when it is in a fully charged state.

[0121] Specifically, the state of charge is the ratio of the remaining capacity of the battery to its capacity in a fully charged state. When the battery pack is fully charged, the ratio of the remaining capacity of the battery pack to its capacity in a fully charged state is 1, that is, the battery pack SOC is 100%.

[0122] Example 6

[0123] Figure 7 This is a flow chart of a battery pack SOC correction control method provided in the sixth embodiment of the present invention. In this embodiment, after the battery pack SOC is corrected, the operating throughput is also cleared. Based on the above embodiments, optionally, refer to Figure 7 , after correcting the battery pack SOC, it also includes:

[0124] S180: Clear the running throughput to zero.

[0125] Specifically, after the battery pack SOC correction is completed, the accumulated operating throughput of the battery pack is cleared and the operating throughput of the battery pack is re-accumulated to improve the judgment accuracy of the accumulated error of the battery pack SOC collection, thereby avoiding the deterioration of the battery pack SOC collection accuracy.

[0126] Example 7

[0127] Figure 8 Schematic diagram of a battery pack SOC correction control device provided by embodiment 7 of the present invention. This embodiment provides a battery pack SOC correction control device. Figure 8 The battery pack SOC correction control device 100 includes: an acquisition module 110, a full-charge correction module 120, a correction judgment module 130, a first correction module 140 and a second correction module 150.

[0128] The acquisition module 110 is configured to obtain a first capacity threshold, a second capacity threshold, the battery pack SOC at the time of power-off, the plateau range, and the battery pack's operating throughput. The first capacity threshold and the second capacity threshold are both preset operating throughput thresholds, with the first capacity threshold being less than the second capacity threshold. The operating throughput is the sum of the accumulated charge and discharge energy during the battery pack's operation in the plateau range from the last battery pack SOC correction to the current power-off of the power-consuming device. The plateau range is the SOC range within which the battery pack is in the plateau range. The battery pack SOC at the time of power-off is the battery pack SOC of the power-consuming device at the time of power-off. The full-charge correction module 120 is configured to correct the battery pack SOC when the battery pack is fully charged if the operating throughput is greater than or equal to the first capacity threshold and less than the second capacity threshold. The correction determination module 130 is configured to determine whether the battery pack SOC at the time of power-off is within the plateau range if the operating throughput is greater than or equal to the second capacity threshold. The first correction module 140 is configured to discharge the battery pack to the non-plateau range and correct the battery pack SOC if the battery pack SOC at the time of power-off is within the plateau range. The second correction module 150 is configured to correct the battery pack SOC if the battery pack SOC at the power-off moment is outside the platform range.

[0129] It should be noted that the battery pack SOC correction control device 100 provided in this embodiment has the beneficial effects of the battery pack SOC correction control method provided in any of the above embodiments, which will not be described in detail here.

[0130] Example 8

[0131] Figure 9: is a structural diagram of an electronic device provided by embodiment eight of the present invention. The electronic device is intended to represent various forms of digital computers, such as laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The electronic device may also represent various forms of mobile devices, such as personal digital processing, cellular phones, smart phones, wearable devices (such as helmets, glasses, watches, etc.) and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely examples and are not intended to limit the implementation of the present invention described and / or required herein.

[0132] like Figure 9 As shown, the electronic device 10 includes at least one processor 11 and a memory, such as a read-only memory (ROM) 12, a random access memory (RAM) 13, etc., which is communicatively connected to the at least one processor 11. The memory stores a computer program that can be executed by the at least one processor. The processor 11 can perform various appropriate actions and processes according to the computer program stored in the read-only memory (ROM) 12 or the computer program loaded from the storage unit 18 into the random access memory (RAM) 13. Various programs and data required for the operation of the electronic device 10 can also be stored in the RAM 13. The processor 11, ROM 12, and RAM 13 are connected to each other via a bus 14. An input / output (I / O) interface 15 is also connected to the bus 14.

[0133] Multiple components in the electronic device 10 are connected to the I / O interface 15, including an input unit 16, such as a keyboard, a mouse, etc.; an output unit 17, such as various types of displays, speakers, etc.; a storage unit 18, such as a magnetic disk, an optical disk, etc.; and a communication unit 19, such as a network card, a modem, a wireless communication transceiver, etc. The communication unit 19 allows the electronic device 10 to exchange information / data with other devices via a computer network such as the Internet and / or various telecommunication networks.

[0134] The processor 11 can be any general-purpose and / or specialized processing component with processing and computing capabilities. Some examples of the processor 11 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various specialized artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, a digital signal processor (DSP), and any other suitable processor, controller, microcontroller, etc. The processor 11 executes the various methods and processes described above, such as the battery pack SOC correction control method.

[0135] In some embodiments, the battery pack SOC correction control method may be implemented as a computer program, which is tangibly contained in a computer-readable storage medium, such as a storage unit 18. In some embodiments, part or all of the computer program may be loaded and / or installed on the electronic device 10 via the ROM 12 and / or the communication unit 19. When the computer program is loaded into the RAM 13 and executed by the processor 11, one or more steps of the battery pack SOC correction control method described above may be performed. Alternatively, in other embodiments, the processor 11 may be configured to execute the battery pack SOC correction control method in any other appropriate manner (e.g., by means of firmware).

[0136] Various embodiments of the systems and techniques described herein can be implemented in digital electronic circuit systems, integrated circuit systems, field programmable gate arrays (FPGAs), application specific integrated circuits (ASICs), application specific standard products (ASSPs), system-on-chip systems (SOCs), programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various embodiments can include being implemented in one or more computer programs that are executable and / or interpreted on a programmable system that includes at least one programmable processor, which can be a special purpose or general purpose programmable processor that can receive data and instructions from a storage system, at least one input device, and at least one output device, and transmit data and instructions to the storage system, the at least one input device, and the at least one output device.

[0137] Computer programs for implementing the methods of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, such that when the computer program is executed by the processor, the functions / operations specified in the flowcharts and / or block diagrams are implemented. The computer program may be executed entirely on the machine, partially on the machine, as a stand-alone software package, partially on the machine and partially on a remote machine, or entirely on a remote machine or server.

[0138] In the context of the present invention, computer-readable storage media can be tangible media that can contain or store a computer program for use with an instruction execution system, device or equipment or used in combination with an instruction execution system, device or equipment. Computer-readable storage media can include but are not limited to electronic, magnetic, optical, electromagnetic, infrared or semiconductor systems, devices or equipment, or any suitable combination of the foregoing. Alternatively, computer-readable storage media can be machine-readable signal media. More specific examples of machine-readable storage media can include electrical connections based on one or more lines, portable computer disks, hard disks, random access memories (RAM), read-only memories (ROM), erasable programmable read-only memories (EPROM or flash memory), optical fibers, portable compact disk read-only memories (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination of the foregoing.

[0139] To provide interaction with a user, the systems and techniques described herein can be implemented on an electronic device having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to the user; and a keyboard and pointing device (e.g., a mouse or trackball) through which the user can provide input to the electronic device. Other types of devices can also be used to provide interaction with the user; for example, the feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user can be received in any form (including acoustic input, voice input, or tactile input).

[0140] The systems and techniques described herein can be implemented in a computing system that includes back-end components (e.g., as a data server), or a computing system that includes middleware components (e.g., an application server), or a computing system that includes front-end components (e.g., a user computer with a graphical user interface or web browser through which a user can interact with implementations of the systems and techniques described herein), or a computing system that includes any combination of such back-end components, middleware components, or front-end components. The components of the system can be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: a local area network (LAN), a wide area network (WAN), a blockchain network, and the Internet.

[0141] A computing system may include clients and servers. The clients and servers are typically remote from each other and typically interact via a communication network. This client-server relationship arises through computer programs running on the respective computers, creating a client-server relationship. The server may be a cloud server, also known as a cloud computing server or cloud host. This server is a hosting product within the cloud computing service ecosystem that addresses the management difficulties and limited scalability of traditional physical hosting and VPS services.

[0142] It should be understood that the various forms of the processes shown above can be used to reorder, add, or delete steps. For example, the steps described in the present invention can be performed in parallel, sequentially, or in a different order, as long as the desired results of the technical solution of the present invention can be achieved. This is not limited herein.

[0143] The above specific embodiments do not limit the scope of protection of the present invention. Those skilled in the art will appreciate that various modifications, combinations, sub-combinations, and substitutions may be made based on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention are intended to be included within the scope of protection of the present invention.

Claims

1. A battery pack SOC correction control method, characterized in that: The battery pack includes multiple lithium-ion batteries; The battery pack SOC correction control method includes: Obtain a first capacity threshold, a second capacity threshold, the battery pack SOC at the time of power-off, a platform area range, and an operating throughput of the battery pack; wherein the first capacity threshold and the second capacity threshold are both preset operating throughput threshold values, the first capacity threshold is less than the second capacity threshold, and the operating throughput is the sum of the accumulated charging and discharging amounts of the battery pack when operating in the platform area from the last battery pack SOC correction to the current power-off of the power-consuming device; the platform area range is the SOC range of the battery pack in the platform area; and the battery pack SOC at the time of power-off is the battery pack SOC of the power-consuming device at the time of the current power-off. If the operating throughput is greater than or equal to the first capacity threshold and less than the second capacity threshold, correcting the battery pack SOC when the battery pack is in a fully charged state; If the operating throughput is greater than or equal to the second capacity threshold, determining whether the battery pack SOC at the power-off moment is within the platform range; If the battery pack SOC at the power-off moment is within the platform range, discharging the battery pack to the non-platform range and correcting the battery pack SOC; If the battery pack SOC at the power-off moment is outside the platform range, correcting the battery pack SOC; The plateau region includes an interval close to a non-plateau region, wherein the interval close to the non-plateau region is an SOC interval with a minimum boundary value of the plateau region as an interval minimum value, and a maximum value of the interval close to the non-plateau region is less than a maximum boundary value of the plateau region; before discharging the battery pack to the non-plateau region and correcting the battery pack SOC, the method further includes: Determining whether the battery pack SOC at the power-off moment is within the close-to-non-platform range; If the battery pack SOC at the power-off time is within the range close to the non-platform region, discharging the battery pack to the non-platform region and correcting the battery pack SOC; If the SOC of the battery pack at the power-off moment is outside the near-non-platform range, the battery pack is controlled to hibernate.

2. The battery pack SOC correction control method according to claim 1, characterized in that: The platform area range includes: a common platform area interval, wherein the common platform area interval is an SOC interval with a maximum boundary value of the platform area range as an interval maximum value, and a minimum interval value of the common platform area interval is greater than a minimum boundary value of the platform area range; before determining whether the battery pack SOC at the power-off moment is within the platform area range, the method further includes: Determining whether the battery pack SOC at the power-off moment is within the normal platform range; If the battery pack SOC at the power-off moment is within the normal platform range, controlling the battery pack to hibernate; If the battery pack SOC at the power-off time is outside the normal platform range, it is determined whether the battery pack SOC at the power-off time is within the platform range.

3. The battery pack SOC correction control method according to claim 1, characterized in that: The specific method of discharging the battery pack includes: Obtaining the current temperature of the battery pack and the optimal temperature range of the battery pack; If the current temperature is lower than a minimum value of the optimal temperature range of the battery pack, heating the battery pack to consume the electric energy of the battery pack; If the current temperature is greater than a maximum value of the optimal temperature range of the battery pack, cooling the battery pack to consume electrical energy of the battery pack; If the current temperature is greater than or equal to a minimum value of the optimal temperature range of the battery pack and less than or equal to a maximum value of the optimal temperature range of the battery pack, a heating and cooling cycle is performed on the battery pack to consume electrical energy of the battery pack.

4. The battery pack SOC correction control method according to claim 1, characterized in that: The specific method for correcting the battery pack SOC includes: Obtaining an open circuit voltage of the battery pack and an OCV-SOC curve of the battery pack; Determining the actual SOC of the battery pack at a current moment according to the open circuit voltage of the battery pack and the OCV-SOC curve of the battery pack; The actual SOC of the battery pack at the current moment is used as the battery pack SOC of the battery pack at the current moment.

5. The battery pack SOC correction control method according to claim 1, characterized in that: The specific method for correcting the SOC of the battery pack when the battery pack is in a fully charged state includes: Prompting the user to fully charge the battery pack; If the user fully charges the battery pack, the SOC of the battery pack when it is in a fully charged state is assigned to 100% to correct the SOC of the battery pack when it is in a fully charged state; If the user has not fully charged the battery pack, the user is continuously prompted to fully charge the battery pack.

6. The battery pack SOC correction control method according to any one of claims 1 to 5, characterized in that: The specific method of discharging the battery pack to a non-platform region and correcting the SOC of the battery pack includes: The battery pack is discharged within a preset time, and the battery pack SOC is corrected when the battery pack SOC is less than or equal to a minimum boundary value of the platform range.

7. The battery pack SOC correction control method according to claim 6, characterized in that: The specific method of discharging the battery pack within the preset time includes: Get the current time and the preset time; Calculate the timing duration according to the current time and the preset time and perform a countdown; After the countdown of the timing duration ends, the battery pack is discharged.

8. The battery pack SOC correction control method according to claim 1, characterized in that: After the battery pack SOC is corrected, the method further includes: Clear the throughput of the run to zero.

9. A battery pack SOC correction control device, characterized in that: Used to execute the battery pack SOC correction control method according to any one of claims 1 to 8, the battery pack SOC correction control device comprises: An acquisition module is configured to acquire a first capacity threshold, a second capacity threshold, the battery pack SOC at the time of power-off, a platform area range, and an operating throughput of the battery pack; wherein the first capacity threshold and the second capacity threshold are both preset operating throughput threshold values, the first capacity threshold is less than the second capacity threshold, and the operating throughput is the sum of the accumulated charging and discharging amounts of the battery pack during operation in the platform area from the last battery pack SOC correction to the current power-off of the power-consuming device; the platform area range is the SOC range of the battery pack in the platform area; and the battery pack SOC at the time of power-off is the battery pack SOC of the power-consuming device at the time of the current power-off. a full-charge correction module, configured to correct the battery pack SOC when the battery pack is in a fully-charged state if the operating throughput is greater than or equal to the first capacity threshold and less than the second capacity threshold; a modified judgment module, configured to judge whether the battery pack SOC at the power-off moment is within the platform range if the operating throughput is greater than or equal to the second capacity threshold; a first correction module, configured to discharge the battery pack to a non-platform area and correct the battery pack SOC if the battery pack SOC at the power-off moment is within the platform area; a second correction module, configured to correct the battery pack SOC if the battery pack SOC at the power-off moment is outside the platform range; The plateau region includes an interval close to a non-plateau region, wherein the interval close to the non-plateau region is an SOC interval with a minimum boundary value of the plateau region as an interval minimum value, and a maximum value of the interval close to the non-plateau region is less than a maximum boundary value of the plateau region; before discharging the battery pack to the non-plateau region and correcting the battery pack SOC, the method further includes: Determining whether the battery pack SOC at the power-off moment is within the close-to-non-platform range; If the battery pack SOC at the power-off time is within the range close to the non-platform region, discharging the battery pack to the non-platform region and correcting the battery pack SOC; If the SOC of the battery pack at the power-off moment is outside the near-non-platform range, the battery pack is controlled to hibernate.

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