A method, device, vehicle and medium for calibrating SOC of a power battery

Abstract

The present invention discloses a SOC calibration method, device, vehicle and medium for a power battery. The SOC calibration method for a power battery includes: starting charging; obtaining the last charging state; obtaining the battery charging integral factor according to the last charging state; completing the SOC calibration of the power battery according to the battery charging integral factor to reduce the SOC error accumulation and improve the SOC accuracy.

Description

Technical Field

[0001] The present invention relates to the technical field of power batteries, and in particular to a SOC calibration method, device, vehicle and medium for a power battery. Background Art

[0002] SOC (State-of-Charge) reflects the remaining power of the battery and is a key parameter for measuring the battery discharge capacity, battery balancing control, and charge and discharge cut-off conditions. The SOC of the power battery describes the actual available state of the remaining power of the battery. Accurate and reasonable estimation of SOC can not only extend the service life of the battery and prevent the battery from being overcharged or over-discharged, but also improve the performance of the battery and reduce the cost of the battery. Therefore, improving the accuracy of SOC estimation has become an important direction of current SOC research, which is crucial to the development of the new energy vehicle industry and battery management system (BMS). Summary of the invention

[0003] The present invention provides a SOC calibration method, device, vehicle and medium for a power battery to reduce SOC error accumulation and improve SOC accuracy.

[0004] According to one aspect of the present invention, a method for calibrating the SOC of a power battery is provided, comprising:

[0005] Start charging;

[0006] Get the last charging status;

[0007] Acquire a battery charging integral factor according to the last charging state;

[0008] The SOC calibration of the power battery is completed according to the battery charging integration factor.

[0009] Optionally, the battery charging integration factor includes a first battery charging integration factor;

[0010] Obtaining a battery charging integral factor according to the last charging state, including:

[0011] Determining whether the last charging state is a fully charged state;

[0012] If yes, then obtain the charging time interval;

[0013] If not, then obtain the first battery charging integration factor.

[0014] Optionally, obtaining a first battery charging integral factor includes:

[0015] Get the preset value of the battery charging integral factor;

[0016] Get the battery's last discharge SOC error correction coefficient and the battery's last charge SOC error correction coefficient;

[0017] A first battery charging integration factor is obtained according to the preset value of the battery charging integration factor, the battery last discharge SOC error correction coefficient, and the battery last charge SOC error correction coefficient.

[0018] Optionally, the SOC error correction coefficient of the last discharge of the battery and the SOC error correction coefficient of the last charge of the battery are obtained, including:

[0019] Acquire self-discharge information, first current zero drift information and first sampling information of the battery during the last discharge process;

[0020] Acquire a last discharge SOC error correction coefficient of the battery according to the self-discharge information, the first current zero drift information and the first sampling information;

[0021] Acquire the second current zero drift information and the second sampling information during the last charging process of the battery;

[0022] The last charging SOC error correction coefficient of the battery is obtained according to the second current zero drift information and the second sampling information.

[0023] Optionally, the battery charging integration factor includes a second battery charging integration factor and a third battery charging integration factor; the first battery charging integration factor is greater than the second battery charging integration factor, and the second battery charging integration factor is greater than the third battery charging integration factor;

[0024] After obtaining the charging time interval, it also includes:

[0025] Get the preset charging time interval;

[0026] Determining whether the charging time interval is greater than or equal to the preset charging time interval;

[0027] If yes, obtaining a second battery charging integral factor;

[0028] If not, then obtain the third battery charging integration factor.

[0029] Optionally, obtaining a second battery charging integral factor includes:

[0030] Get the preset value of the battery charging integral factor;

[0031] Get the SOC error correction coefficient of the last discharge of the battery;

[0032] Obtaining a second battery charging integration factor according to the preset value of the battery charging integration factor and the battery last discharge SOC error correction coefficient;

[0033] Obtaining the third battery charging integration factor includes:

[0034] Obtaining a preset value of the battery charging integral factor;

[0035] A third battery charging integration factor is obtained according to the preset value of the battery charging integration factor.

[0036] Optionally, after completing the SOC calibration of the power battery according to the battery charging integral factor, the method further includes:

[0037] Stop charging;

[0038] Determine whether the current charging state is fully charged;

[0039] If so, the SOC of the calibrated power battery is considered to be 100%;

[0040] If not, the current SOC of the power battery is maintained.

[0041] According to another aspect of the present invention, a SOC calibration device for a power battery is provided, wherein the SOC calibration method for a power battery according to any one of the above aspects is performed by the SOC calibration device for the power battery, and the SOC calibration device for the power battery comprises:

[0042] A charging start module, used to start charging;

[0043] The last charging status acquisition module is used to obtain the last charging status;

[0044] A battery charging integral factor acquisition module, used to acquire the battery charging integral factor according to the last charging state;

[0045] The SOC charging calibration module is used to complete the SOC calibration of the power battery according to the battery charging integration factor.

[0046] According to another aspect of the present invention, a vehicle is provided, the vehicle comprising:

[0047] At least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores a computer program executable by the at least one processor, and the computer program is executed by the at least one processor so that the at least one processor can execute the SOC calibration method of the power battery described in any one of the above aspects.

[0048] According to another aspect of the present invention, a computer-readable storage medium is provided, characterized in that the computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a processor to implement the SOC calibration method of a power battery described in any one of the above aspects when executed.

[0049] The technical solution of the embodiment of the present invention provides a SOC calibration method for a power battery, including: starting charging; obtaining the last charging state; obtaining a battery charging integral factor according to the last charging state; and completing SOC calibration of the power battery according to the battery charging integral factor to reduce SOC error accumulation and improve SOC accuracy.

[0050] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] 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.

[0052] Figure 1 A flow chart of a SOC calibration method for a power battery provided by an embodiment of the present invention;

[0053] Figure 2 A flow chart of another SOC calibration method for a power battery provided by an embodiment of the present invention;

[0054] Figure 3 A flow chart of another SOC calibration method for a power battery provided by an embodiment of the present invention;

[0055] Figure 4 A flow chart of another SOC calibration method for a power battery provided by an embodiment of the present invention;

[0056] Figure 5 A flow chart of another SOC calibration method for a power battery provided by an embodiment of the present invention;

[0057] Figure 6 A flow chart of another SOC calibration method for a power battery provided by an embodiment of the present invention;

[0058] Figure 7 A flow chart of another SOC calibration method for a power battery provided by an embodiment of the present invention;

[0059] Figure 8 A schematic diagram of the structure of a SOC calibration device for a power battery provided by the present invention;

[0060] Fig. 9 A schematic structural diagram of a vehicle provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0061] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme 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 described embodiments 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 creative work should fall within the scope of protection of the present invention.

[0062] It should be noted that the terms "first", "second", etc. in the specification 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 data 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 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.

[0063] Figure 1 A flow chart of a power battery SOC calibration method provided in an embodiment of the present invention. This embodiment is applicable to the SOC calibration of a power battery. The method can be executed by a power battery SOC calibration device. The power battery SOC calibration device can be implemented in the form of hardware and / or software. The power battery SOC calibration device can be configured in a vehicle. In actual application of power batteries, due to usage habits and other reasons, the power battery is in a non-full charge state for a long time or is in a non-full charge state for many times. As time goes by, the accumulated error of the power battery SOC will become larger and larger, which will seriously affect the accuracy of the SOC and needs to be corrected in time to improve the accuracy. Figure 1 As shown, the method includes:

[0064] S101, start charging.

[0065] S102, obtaining the last charging status.

[0066] Among them, after starting charging, the last charging status is obtained, and then it is determined whether the last charging status is fully charged or not fully charged, so as to facilitate more accurate calibration.

[0067] S103, obtaining a battery charging integral factor according to the last charging state.

[0068] Among them, the original battery charging integration factor in the power battery is corrected according to the last charging state to obtain the adjusted battery charging integration factor. When the power battery is charged with current, the power battery is 200mAh when it is fully charged. If it is charged at 100mA for one hour, and the battery charging integration factor at this time is 1, then the SOC of the power battery at this time is 50%; if it is charged at 100mA for one hour, and the battery charging integration factor at this time is 0.8, then the SOC of the power battery at this time is 40%. The battery charging integration factor can reflect the adjustment degree of the power battery SOC. According to the change of the battery charging integration factor, the SOC of the power battery can be calibrated to improve the SOC accuracy of the power battery.

[0069] S104, completing SOC calibration of the power battery according to the battery charging integral factor.

[0070] Among them, the corrected battery charging integral factor can improve the calibration of the power battery SOC and improve the accuracy of the SOC after the current charging is completed.

[0071] The embodiment of the present invention obtains the last charging state after starting charging; obtains the battery charging integral factor according to the last charging state; and completes the SOC calibration of the power battery according to the battery charging integral factor to reduce the SOC error accumulation and improve the SOC accuracy.

[0072] Optional, Figure 2 A flow chart of another SOC calibration method for a power battery provided in an embodiment of the present invention, such as Figure 2 As shown, the battery charging integration factor includes a first battery charging integration factor; the method includes:

[0073] S201, start charging.

[0074] S202, obtaining the last charging status.

[0075] S203, determine whether the last charging state is a full charging state; if so, execute step S204; if not, execute step S205.

[0076] S204, obtaining a charging time interval.

[0077] S205: Obtain a first battery charging integral factor.

[0078] Among them, when the last charging state is a non-full charging state, it is considered that the current power battery is in a non-fully charged state for many times. Therefore, at this time, the battery discharge SOC error and the battery charging SOC error have accumulated to a large extent, and it is necessary to obtain the first battery integral factor to complete the SOC correction. The first battery integral factor needs to perform SOC correction according to the battery discharge SOC error correction coefficient and the battery charging SOC error correction coefficient to ensure SOC accuracy; when the last charging state is a fully charged state, the charging time interval between the last charging time and the current charging time is required to determine whether the current power battery is in a long-term non-full state, so as to perform corresponding SOC correction of the power battery.

[0079] S206 , completing SOC calibration of the power battery according to the charging time interval or the first battery charging integration factor.

[0080] The embodiment of the present invention obtains the last charging status after starting charging; determines whether it is in a fully charged state according to the last charging status, and correspondingly obtains a first battery charging integral factor or a charging time interval; completes SOC calibration of the power battery according to the charging time interval or the first battery charging integral factor to reduce SOC error accumulation and improve SOC accuracy.

[0081] Optional, Figure 3 A flow chart of another SOC calibration method for a power battery provided in an embodiment of the present invention, such as Figure 3 As shown, the method includes:

[0082] S301, start charging.

[0083] S302, obtaining the last charging status.

[0084] S303, determine whether the last charging state is a full charging state; if so, execute step S304; if not, execute step S305.

[0085] S304, obtaining a charging time interval.

[0086] S305, obtaining a preset value of a battery charging integral factor.

[0087] Exemplarily, the preset value of the battery charging integral factor may be 1, and the preset value of the battery charging integral factor may be set accordingly according to the type and state of the power battery, which is not specifically limited in the embodiment of the present invention.

[0088] S306, obtaining the SOC error correction coefficient of the last discharge of the battery and the SOC error correction coefficient of the last charge of the battery.

[0089] S307 , obtaining a first battery charging integration factor according to a preset value of the battery charging integration factor, a battery last discharge SOC error correction coefficient, and a battery last charge SOC error correction coefficient.

[0090] Among them, when the last charging state is in a non-full charging state, the power battery has been in a non-full charging state for many times. At this time, there is a large accumulation of battery discharge SOC error and battery charging SOC error. Therefore, it is necessary to obtain the battery's last discharge SOC error correction coefficient according to the battery discharge SOC error, and obtain the battery's last charging SOC error correction coefficient according to the battery charging SOC error. Then, according to the preset value of the battery charging integral factor, the battery's last discharge SOC error correction coefficient and the battery's last charging SOC error correction coefficient, multiply the first battery charging integral factor, and obtain the corrected first battery charging integral factor to realize charging correction, thereby improving the battery SOC accuracy after the battery is fully charged.

[0091] S308 , completing SOC calibration of the power battery according to the charging time interval or the first battery charging integration factor.

[0092] After charging is started in the embodiment of the present invention, the last charging status is obtained; whether the battery is in a fully charged state is determined according to the last charging status, and a preset value of the battery charging integral factor is correspondingly obtained, and the SOC error correction coefficient of the last discharge of the battery and the SOC error correction coefficient of the last charge of the battery are obtained; a first battery charging integral factor is obtained according to the preset value of the battery charging integral factor, the SOC error correction coefficient of the last discharge of the battery, and the SOC error correction coefficient of the last charge of the battery; and the SOC calibration of the power battery is completed according to the first battery charging integral factor to reduce the SOC error accumulation and improve the SOC accuracy.

[0093] Optional, Figure 4 A flow chart of another SOC calibration method for a power battery provided in an embodiment of the present invention, such as Figure 4 As shown, the method includes:

[0094] S401, start charging.

[0095] S402, obtaining the last charging status.

[0096] S403, determine whether the last charging state is a full charging state; if so, execute step S404; if not, execute step S405.

[0097] S404, obtaining a charging time interval.

[0098] S405, obtaining a preset value of a battery charging integral factor.

[0099] S406, obtaining self-discharge information, first current zero drift information and first sampling information of the battery in the last discharge process.

[0100] S407, obtaining a last discharge SOC error correction coefficient of the battery according to the self-discharge information, the first current zero drift information and the first sampling information.

[0101] Among them, by obtaining the error factors in the last discharge process, specifically including self-discharge information, first current zero drift information and first sampling information, in the battery discharge process, there is a self-discharge phenomenon, which affects the SOC of the battery, so the self-discharge information is obtained; there is also a phenomenon that when there is no current output, due to the influence of temperature, environment and other factors, the static operating point changes, and is amplified and transmitted step by step, causing the current at the output end of the circuit to deviate from the original fixed value and drift up and down, so the first current zero drift information is obtained, because the sampling sensor has a sampling error, it is necessary to obtain the first sampling information, and the self-discharge information, the first current zero drift information and the first sampling information reflecting the error in the last discharge process are calculated in real time to obtain the battery's last discharge SOC error correction coefficient.

[0102] S408, obtaining second current zero drift information and second sampling information during the last charging process of the battery.

[0103] S409, obtaining a battery last charging SOC error correction coefficient according to the second current zero drift information and the second sampling information.

[0104] Among them, by obtaining the error factors in the last charging process of the battery, specifically including the second current zero drift information and the second sampling information, there will also be current zero drift phenomenon and sensor sampling error in the battery charging process. Therefore, the second current zero drift information and the second sampling information in the last charging process of the battery are obtained, and the last charging SOC error correction coefficient of the battery is obtained through real-time calculation.

[0105] S410, obtaining a first battery charging integration factor according to a preset value of the battery charging integration factor, a battery last discharge SOC error correction coefficient, and a battery last charge SOC error correction coefficient.

[0106] S411, completing SOC calibration of the power battery according to the charging time interval or the first battery charging integration factor.

[0107] After charging is started in the embodiment of the present invention, the last charging status is obtained; whether the battery is in a fully charged state is determined according to the last charging status, and a preset value of a battery charging integral factor is correspondingly obtained; an error correction coefficient of the last discharge SOC of the battery is obtained according to self-discharge information, first current zero drift information, and first sampling information; an error correction coefficient of the last charge SOC of the battery is obtained according to second current zero drift information and second sampling information; a first battery charging integral factor is obtained according to the preset value of the battery charging integral factor, the error correction coefficient of the last discharge SOC of the battery, and the error correction coefficient of the last charge SOC of the battery; and SOC calibration of the power battery is completed according to the first battery charging integral factor to reduce SOC error accumulation and improve SOC accuracy.

[0108] Optional, Figure 5 A flow chart of another SOC calibration method for a power battery provided in an embodiment of the present invention, such as Figure 5 As shown, the battery charging integral factor includes a second battery charging integral factor and a third battery charging integral factor; the first battery charging integral factor is greater than the second battery charging integral factor, and the second battery charging integral factor is greater than the third battery charging integral factor;

[0109] The method includes:

[0110] S501, start charging.

[0111] S502, obtaining the last charging status.

[0112] S503, determine whether the last charging state is a full charging state; if so, execute step S504; if not, execute step S510.

[0113] S504, obtaining a preset value of a battery charging integral factor.

[0114] S505, obtaining self-discharge information, first current zero drift information and first sampling information of the battery in the last discharge process.

[0115] S506, obtaining a last discharge SOC error correction coefficient of the battery according to the self-discharge information, the first current zero drift information and the first sampling information.

[0116] S507, obtaining second current zero drift information and second sampling information during the last charging process of the battery;

[0117] S508, obtaining a battery last charging SOC error correction coefficient according to the second current zero drift information and the second sampling information.

[0118] S509 , obtaining a first battery charging integration factor according to a preset value of the battery charging integration factor, a battery last discharge SOC error correction coefficient, and a battery last charge SOC error correction coefficient.

[0119] S510, obtaining a charging time interval.

[0120] S511, obtaining a preset charging time interval.

[0121] S512, determining whether the charging time interval is greater than or equal to a preset charging time interval; if so, executing step S513; if not, executing step S514.

[0122] S513: Obtain a second battery charging integral factor.

[0123] S514: Obtain a third battery charging integral factor.

[0124] Among them, when the last charging state is in a fully charged state, a preset charging time interval is obtained. The preset charging time interval can be set according to actual design requirements. The embodiment of the present invention does not make specific limitations. The preset charging time interval is compared with the charging time interval between the current charging and the last charging. When the charging time interval is greater than the preset charging time interval, it is considered that the battery is in a non-full charging state for a long time. At this time, the battery discharge SOC error accumulates an angle. Therefore, it is necessary to introduce a second battery charging factor related to the battery discharge SOC error for charging correction.

[0125] S515 , completing SOC calibration of the power battery according to the first battery charging integration factor, the second battery charging integration factor, or the third battery charging integration factor.

[0126] The embodiment of the present invention obtains the last charging status after starting charging; determines whether it is in a fully charged state according to the last charging status, and correspondingly obtains the charging time interval; obtains the preset charging time interval, obtains the second battery charging integral factor or the third battery charging integral factor according to the charging time interval and the preset charging time interval, and completes the SOC calibration of the power battery to reduce the SOC error accumulation and improve the SOC accuracy.

[0127] Optional, Figure 6 A flow chart of another SOC calibration method for a power battery provided in an embodiment of the present invention, such as Figure 6 As shown, the method includes:

[0128] S601, start charging.

[0129] S602, obtaining the last charging status.

[0130] S603, determine whether the last charging state is a full charging state; if so, execute step S604; if not, execute step S610.

[0131] S604, obtaining a preset value of a battery charging integral factor.

[0132] S605, obtaining self-discharge information, first current zero drift information and first sampling information of the battery in the last discharge process.

[0133] S606, obtaining a last discharge SOC error correction coefficient of the battery according to the self-discharge information, the first current zero drift information and the first sampling information.

[0134] S607, obtaining second current zero drift information and second sampling information during the last charging process of the battery.

[0135] S608, obtaining a battery last charging SOC error correction coefficient according to the second current zero drift information and the second sampling information.

[0136] S609, obtaining a first battery charging integration factor according to a preset value of the battery charging integration factor, a battery last discharge SOC error correction coefficient, and a battery last charge SOC error correction coefficient.

[0137] S610, obtaining a charging time interval.

[0138] S611, obtaining a preset charging time interval.

[0139] S612, determine whether the charging time interval is greater than or equal to the preset charging time interval; if so, execute step S613; if not, execute step S616.

[0140] S613, obtaining a preset value of a battery charging integral factor.

[0141] S614, obtaining the SOC error correction coefficient of the last discharge of the battery.

[0142] S615, obtaining a second battery charging integration factor according to a preset battery charging integration factor value and a battery last discharge SOC error correction coefficient.

[0143] Among them, when the charging time interval is greater than or equal to the preset time interval, it is considered that the battery is in a non-fully charged state for a long time. At this time, the battery SOC error accumulation angle needs to obtain the battery's last discharge SOC error correction coefficient, and at the same time obtain the battery charging integral factor preset value. According to the battery charging integral factor preset value and the battery's last discharge SOC error correction coefficient, the second battery charging integral factor is obtained to perform charging correction to ensure the accuracy of the SOC of the power battery for this charging.

[0144] S616, obtaining a preset value of the battery charging integral factor.

[0145] S617: Obtain a third battery charging integral factor according to a preset value of the battery charging integral factor.

[0146] Among them, when the charging time interval is less than the preset time interval, it is considered that the battery is in a non-fully charged state in a short time. At this time, the accumulated discharge error is small. Therefore, it is only necessary to obtain the preset value of the battery charging integral factor, and obtain the third battery charging integral factor according to the preset value of the battery charging integral factor, that is, to obtain the third battery charging integral factor equal to the preset value of the battery charging integral factor, and perform charging correction to ensure the accuracy of the SOC of the power battery for this charging.

[0147] S618 , completing SOC calibration of the power battery according to the first battery charging integration factor, the second battery charging integration factor, or the third battery charging integration factor.

[0148] The embodiment of the present invention obtains the last charging status after starting charging; determines whether the battery is in a fully charged state according to the last charging status, and correspondingly obtains a charging time interval; obtains a preset charging time interval, obtains a second battery charging integral factor according to a preset value of the battery charging integral factor and a correction coefficient of the SOC error of the last discharge of the battery, obtains a third battery charging integral factor according to the preset value of the battery charging integral factor, and completes SOC calibration of the power battery according to the second battery charging integral factor or the third battery charging integral factor, so as to reduce SOC error accumulation and improve SOC accuracy.

[0149] Optional, Figure 7 A flow chart of another SOC calibration method for a power battery provided in an embodiment of the present invention, such as Figure 7 As shown, the method includes:

[0150] S701, start charging.

[0151] S702, obtaining the last charging status.

[0152] S703, determine whether the last charging state is a full charging state; if so, execute step S704; if not, execute step S710.

[0153] S704, obtaining a preset value of a battery charging integral factor.

[0154] S705, obtaining self-discharge information, first current zero drift information and first sampling information of the battery in the last discharge process.

[0155] S706, obtaining a last discharge SOC error correction coefficient of the battery according to the self-discharge information, the first current zero drift information and the first sampling information.

[0156] S707, obtaining second current zero drift information and second sampling information during the last charging process of the battery.

[0157] S708, obtaining a battery last charging SOC error correction coefficient according to the second current zero drift information and the second sampling information.

[0158] S709, obtaining a first battery charging integration factor according to a preset value of the battery charging integration factor, a battery last discharge SOC error correction coefficient, and a battery last charge SOC error correction coefficient.

[0159] S710, obtaining a charging time interval.

[0160] S711, obtaining a preset charging time interval.

[0161] S712, determine whether the charging time interval is greater than or equal to the preset charging time interval; if so, execute step S713; if not, execute step S716.

[0162] S713, obtaining a preset value of the battery charging integral factor.

[0163] S714, obtaining the SOC error correction coefficient of the last discharge of the battery.

[0164] S715 , obtaining a second battery charging integration factor according to a preset battery charging integration factor value and a battery last discharge SOC error correction coefficient.

[0165] S716, obtaining a preset value of the battery charging integral factor.

[0166] S717: Obtain a third battery charging integral factor according to a preset value of the battery charging integral factor.

[0167] S718 , completing SOC calibration of the power battery according to the first battery charging integration factor, the second battery charging integration factor, or the third battery charging integration factor.

[0168] S719, stop charging.

[0169] S720, determine whether the current charging state is a full charging state; if so, execute step S721; if not, execute step S722.

[0170] S721, it is considered that the SOC of the calibrated power battery is 100%.

[0171] S722, maintain the current SOC of the power battery.

[0172] Among them, after stopping charging, the charging can be stopped by artificial power off or automatically stopped after full charging. When the current charging state is fully charged, the calibrated current power battery SOC is considered to be 100%; when the current charging state is not fully charged, the current power battery SOC is maintained, reflecting the actual SOC after the current charging is completed, that is, a value less than 100%.

[0173] The embodiment of the present invention completes the SOC calibration of the power battery according to the first battery charging integral factor, the second battery charging integral factor or the first battery charging integral factor; after stopping charging, the full charge state of the current charging state is judged, and then the SOC of the power battery is determined to reduce the SOC error accumulation and improve the SOC accuracy.

[0174] Figure 8 A schematic diagram of the structure of a SOC calibration device for a power battery provided by the present invention, such as Figure 8 As shown, the SOC calibration method of the power battery including any one of the above embodiments is performed by the SOC calibration device of the power battery, and the SOC calibration device of the power battery includes:

[0175] A charging start module 201 is used to start charging;

[0176] The last charging status acquisition module 202 is used to acquire the last charging status;

[0177] A battery charging integral factor acquisition module 203, used to acquire a battery charging integral factor according to the last charging state;

[0178] The SOC charging calibration module 204 is used to complete the SOC calibration of the power battery according to the battery charging integral factor.

[0179] It should be noted that, since the SOC calibration device for a power battery provided in this embodiment includes any of the SOC calibration methods for a power battery provided in the embodiments of the present invention, it has the same or corresponding beneficial effects as the SOC calibration method for a power battery, which will not be described in detail here.

[0180] Fig. 9 A schematic diagram of the structure of a vehicle provided by an embodiment of the present invention, Fig. 9 A schematic diagram of a vehicle 10 that can be used to implement an embodiment of the present invention is shown. The vehicle 10 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 vehicle 10 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 claimed herein.

[0181] like Fig. 9As shown, the vehicle 10 includes at least one processor 11, and a memory connected to the at least one processor 11, such as a read-only memory (ROM) 12, a random access memory (RAM) 13, etc., wherein the memory stores a computer program that can be executed by at least one processor, and 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 to the random access memory (RAM) 13. Various programs and data required for the operation of the vehicle 10 can also be stored in the random access memory (RAM) 13. The processor 11, the read-only memory (ROM) 12, and the random access memory (RAM) 13 are connected to each other through a bus 14. An input / output (I / O) interface 15 is also connected to the bus 14.

[0182] A number of components in the vehicle 10 are connected to an input / output (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 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 vehicle 10 to exchange information / data with other devices through a computer network such as the Internet and / or various telecommunication networks.

[0183] The processor 11 may be a variety of general and / or special processing components 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 dedicated artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, a digital signal processor (DSP), and any appropriate processor, controller, microcontroller, etc. The processor 11 performs the various methods and processes described above, such as the SOC calibration method of the power battery.

[0184] In some embodiments, the SOC calibration method of the power battery 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 vehicle 10 via a read-only memory (ROM) 12 and / or a communication unit 19. When the computer program is loaded into a random access memory (RAM) 13 and executed by the processor 11, one or more steps of the SOC calibration method of the power battery described above may be performed. Alternatively, in other embodiments, the processor 11 may be configured to execute the SOC calibration method of the power battery in any other appropriate manner (e.g., by means of firmware).

[0185] Various implementations of the systems and techniques described above 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), systems on chips (SOCs), load programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various implementations can include: being implemented in one or more computer programs that can be executed and / or interpreted on a programmable system including 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.

[0186] 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, so that when the computer program is executed by the processor, the functions / operations specified in the flow chart and / or block diagram are implemented. The computer program may be executed entirely on the machine, partially on the machine, partially on the machine and partially on a remote machine as a stand-alone software package, or entirely on a remote machine or server.

[0187] In the context of the present invention, a computer-readable storage medium may be a tangible medium that may contain or store a computer program for use by or in combination with an instruction execution system, device or equipment. A computer-readable storage medium may include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices or equipment, or any suitable combination of the foregoing. Alternatively, a computer-readable storage medium may be a machine-readable signal medium. A more specific example of a machine-readable storage medium may include an electrical connection based on one or more lines, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0188] To provide interaction with a user, the systems and techniques described herein can be implemented on a vehicle 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 vehicle. 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).

[0189] The systems and techniques described herein may be implemented in a computing system that includes backend 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 frontend components (e.g., a user computer with a graphical user interface or a 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 backend components, middleware components, or frontend components. The components of the system may 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.

[0190] A computing system may include a client and a server. The client and the server are generally remote from each other and usually interact through a communication network. The client and server relationship is generated by computer programs running on the corresponding computers and having a client-server relationship with each other. The server may be a cloud server, also known as a cloud computing server or cloud host, which is a host product in the cloud computing service system to solve the defects of difficult management and weak business scalability in traditional physical hosts and VPS services.

[0191] An embodiment of the present invention further provides a computer program product, which includes a computer program. When the computer program is executed by a processor, the method for calibrating the SOC of a power battery according to any one of the above embodiments is implemented.

[0192] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0193] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for calibrating the SOC of a power battery, characterized in that: include: Start charging; Get the last charging status; Acquire a battery charging integral factor according to the last charging state; Completing SOC calibration of the power battery according to the battery charging integral factor; The battery charging integration factor includes a first battery charging integration factor; Obtaining a battery charging integral factor according to the last charging state, including: determining whether the last charging state is a full charging state; if so, obtaining a charging time interval; if not, obtaining a first battery charging integral factor; Obtaining a first battery charging integral factor includes: obtaining a preset value of the battery charging integral factor; obtaining a battery last discharge SOC error correction coefficient and a battery last charge SOC error correction coefficient; obtaining the first battery charging integral factor according to the preset value of the battery charging integral factor, the battery last discharge SOC error correction coefficient and the battery last charge SOC error correction coefficient.

2. The SOC calibration method of a power battery according to claim 1, characterized in that: Get the battery's last discharge SOC error correction factor and the battery's last charge SOC error correction factor, including: Acquire self-discharge information, first current zero drift information and first sampling information of the battery during the last discharge process; Acquire a last discharge SOC error correction coefficient of the battery according to the self-discharge information, the first current zero drift information and the first sampling information; Acquire the second current zero drift information and the second sampling information during the last charging process of the battery; The last charging SOC error correction coefficient of the battery is obtained according to the second current zero drift information and the second sampling information.

3. The SOC calibration method of a power battery according to claim 1, characterized in that: The battery charging integration factor includes a second battery charging integration factor and a third battery charging integration factor; the first battery charging integration factor is greater than the second battery charging integration factor, and the second battery charging integration factor is greater than the third battery charging integration factor; After obtaining the charging time interval, it also includes: Get the preset charging time interval; Determining whether the charging time interval is greater than or equal to the preset charging time interval; If yes, obtaining a second battery charging integral factor; If not, then obtain the third battery charging integration factor.

4. The SOC calibration method of a power battery according to claim 3, characterized in that: Get the second battery charging integration factor, including: Get the preset value of the battery charging integral factor; Get the SOC error correction coefficient of the last discharge of the battery; Obtaining a second battery charging integration factor according to the preset value of the battery charging integration factor and the battery last discharge SOC error correction coefficient; Obtaining the third battery charging integration factor includes: Obtaining a preset value of the battery charging integral factor; A third battery charging integration factor is obtained according to the preset value of the battery charging integration factor.

5. The SOC calibration method of a power battery according to claim 1, characterized in that: After completing the SOC calibration of the power battery according to the battery charging integral factor, the method further includes: Stop charging; Determine whether the current charging state is fully charged; If yes, the SOC of the calibrated power battery is considered to be 100%; If not, the current SOC of the power battery is maintained.

6. A SOC calibration device for a power battery, characterized in that: The SOC calibration method of the power battery according to any one of claims 1 to 5 is performed by the SOC calibration device of the power battery, and the SOC calibration device of the power battery comprises: A charging start module, used to start charging; The last charging status acquisition module is used to obtain the last charging status; A battery charging integral factor acquisition module, used to acquire the battery charging integral factor according to the last charging state; The SOC charging calibration module is used to complete the SOC calibration of the power battery according to the battery charging integration factor.

7. A vehicle, characterized in that: The vehicle comprises: At least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores a computer program executable by the at least one processor, and the computer program is executed by the at least one processor so that the at least one processor can execute the SOC calibration method for the power battery according to any one of claims 1 to 5.

8. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a processor to implement the SOC calibration method for a power battery according to any one of claims 1 to 5 when executed.

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