Method, device, equipment and medium for correcting battery state of charge

Abstract

The present application discloses a method, device, equipment and medium for correcting the state of charge of a battery, wherein the method for correcting the state of charge of a battery in series comprises: obtaining the initial display value of the state of charge of a battery in series at the current moment and the true value of the state of charge at the current moment; calculating the error power according to the true value of the state of charge and the initial display value of the state of charge; determining the remaining compensation time according to the true value of the state of charge and the working mode of the battery in series; during the remaining compensation time, correcting the initial display value of the state of charge according to the working mode of the battery in series and the error power, and obtaining the corrected modified display value of the state of charge at the current moment. During the remaining compensation time, the present application uniformly corrects the initial display value of the state of charge according to the working mode of the battery in series and the error power, and obtains a high-precision modified display value of the state of charge.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a method, device, equipment and medium for correcting a battery state of charge. Background Art

[0002] The battery state of charge (SOC) is an important basis for the vehicle control system to formulate the optimal energy management strategy. Accurately estimating the battery state of charge SOC value is particularly important for extending battery life.

[0003] Common calculation methods for battery state of charge are ampere-hour integration, voltage correction, neural network, etc.; among them, neural network calculation of SOC is more accurate, but it requires a large number of stable operating conditions to calculate and correct, which occupies a lot of resources; and voltage correction has many restrictions on use because the battery electromotive force and internal resistance characteristics are affected by factors such as temperature and current; ampere-hour integration will continuously accumulate errors due to the current sampling accuracy.

[0004] In the related art, for a series battery system, the ampere-hour integral is often used as the basic calculation of SOC, and then combined with voltage correction. However, the above method has the problem of low accuracy of battery state of charge. Summary of the invention

[0005] Therefore, the present invention provides a method, device, apparatus and medium for correcting the state of charge of a battery, which at least partially solve the above-mentioned problems.

[0006] The present invention provides a method for correcting a battery state of charge, the method for correcting a battery state of charge comprising:

[0007] Obtain the initial displayed value of the state of charge of the series battery pack at the current moment and the actual value of the state of charge at the current moment;

[0008] Calculating the error power according to the actual value of the state of charge and the initial display value of the state of charge;

[0009] Determine the remaining compensation time according to the actual value of the state of charge and the working mode of the series battery pack;

[0010] During the remaining compensation time, the initial state of charge display value is uniformly corrected according to the working mode of the series battery pack and the error quantity to obtain a corrected state of charge modified display value at the current moment.

[0011] As an optimal method that can be realized, the initial display value of the state of charge is uniformly corrected according to the working mode of the series battery pack and the error quantity, including:

[0012] Determine the compensation ratio relationship according to the battery power display interval time and the remaining compensation time;

[0013] Determining the compensation power according to the relationship between the error power and the compensation ratio;

[0014] The initial display value of the state of charge is corrected according to the working mode of the series battery pack and the compensation quantity.

[0015] As an optimal method that can be realized, the initial display value of the state of charge is corrected according to the working mode of the series battery pack and the compensation power, including:

[0016] When the working mode of the series battery pack is the charging mode and the error power is a positive number, the compensation power is added to the initial display value of the state of charge;

[0017] When the working mode of the series battery pack is the charging mode and the error power is a negative number, the compensation power is subtracted from the initial display value of the state of charge;

[0018] When the working mode of the series battery pack is the discharge mode and the error power is a positive number, the compensation power is added to the initial display value of the state of charge;

[0019] When the working mode of the series battery pack is the discharge mode and the error power is a negative number, the compensation power will be subtracted from the initial display value of the state of charge.

[0020] As an optimal achievable manner, within the remaining compensation time, before the charge state modification initial value is corrected according to the compensation quantity, the method further includes:

[0021] When the initial display value of the state of charge is greater than or equal to a first threshold, the initial value of the state of charge is modified according to the compensation power, and the first threshold is a threshold set by the series battery pack in the charging mode for triggering the correction; or

[0022] When the initial state of charge display value is less than or equal to a second threshold, the initial state of charge display value is corrected according to the compensation power, and the second threshold is a threshold set by the series battery pack in the discharge mode for triggering correction.

[0023] As an optimal method that can be realized, determining the remaining compensation time according to the initial display value of the state of charge and the working mode of the series battery pack includes:

[0024] When the operation mode of the series battery group is the charging mode, determining the time required for the series battery group to be charged from the initial display value of the state of charge to the full state of the series battery group as the remaining compensation time;

[0025] When the operation mode of the series-connected battery group is the discharge mode, the time required for the series-connected battery group to discharge from the initial display value of the state of charge to the empty state of the series-connected battery group is determined as the remaining compensation time.

[0026] As an optimal method that can be realized, obtaining the true value of the battery state of charge includes:

[0027] Obtain a voltage-battery capacity mapping curve established based on temperature;

[0028] According to the current temperature of the series-connected battery pack, a voltage-battery capacity mapping curve corresponding to the current temperature is selected;

[0029] Acquire the open circuit voltage of the series-connected battery group at the current temperature according to the working mode of the series-connected battery group;

[0030] Based on the open circuit voltage at the current temperature and the voltage-battery capacity mapping curve corresponding to the current temperature, the true value of the state of charge of the series battery pack at the current temperature is obtained.

[0031] As an optimal method that can be realized, the method of obtaining the true value of the state of charge of the battery further includes:

[0032] Obtain a voltage-battery capacity mapping curve established based on temperature and charge and discharge rate;

[0033] According to the current temperature and the current charge and discharge rate of the series battery pack, a voltage-battery capacity mapping curve corresponding to the current temperature and the current charge and discharge rate is selected;

[0034] Acquire the open circuit voltage of the series-connected battery group at the current temperature according to the working mode of the series-connected battery group;

[0035] Based on the open circuit voltage at the current temperature and the voltage-battery capacity mapping curve corresponding to the current temperature and the current charge and discharge rate, the true value of the state of charge of the series battery pack at the current temperature is obtained.

[0036] The present invention provides a device for correcting the state of charge of a battery, comprising:

[0037] An acquisition unit, used to acquire an initial display value of the state of charge of the series-connected battery pack at the current moment and a real value of the state of charge at the current moment;

[0038] A calculation unit, configured to calculate an error electric quantity according to the true value of the state of charge and the initial display value of the state of charge;

[0039] A determination unit, configured to determine a remaining compensation time according to the actual value of the state of charge and an operation mode of the series battery pack;

[0040] The correction unit is used to uniformly correct the initial display value of the state of charge by using the error electric quantity within the remaining compensation time to obtain a corrected modified display value of the state of charge at the current moment.

[0041] The present invention provides a terminal device, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor is used to implement the method for correcting the battery charge state as described when executing the program.

[0042] The present invention provides a computer-readable storage medium on which a computer program is stored. The computer program is used to implement the method for correcting the battery state of charge as described above.

[0043] In the remaining compensation time, the application uniformly corrects the initial display value of the state of charge according to the working mode of the series battery pack and the error power, and obtains a high-precision modified display value of the state of charge; the established voltage-battery capacity mapping curve simultaneously considers the two factors of temperature and charge and discharge rate to establish a binary mapping relationship, which has a higher fit with the actual state of charge; under charging conditions and discharging conditions, the initial display value SOC of the state of charge is n Less than or equal to 20%, the initial display value of the state of charge SOC n Greater than or equal to 80%, the initial display value SOC of the state of charge n Wide correction range; initial display value SOC of the state of charge under charging and discharging conditions n Greater than the actual value of the state of charge SOC m , or the initial display value of the state of charge SOC n Less than the actual value of the state of charge SOC m All of them can be smoothed by compensating the power before reaching the cut-off voltage to avoid SOC step jumps, and the SOC smoothing effect is good. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings:

[0045] Figure 1 is a flow chart of a method for correcting a battery state of charge according to an embodiment of the present application;

[0046] Figure 2 It is a voltage-battery capacity mapping curve according to an embodiment of the present application.

[0047] Figure 3 A topological diagram of a method for correcting a battery state of charge according to an embodiment of the present application;

[0048] Figure 4 The correction effect of the battery state of charge value under charging conditions according to the implementation of the present application Figure 1 ;

[0049] Figure 5 The correction effect of the battery state of charge value under charging conditions according to the implementation of the present application Figure 2 ;

[0050] Figure 6 The correction effect of the battery state of charge value under discharge conditions according to the implementation of the present application is Figure 1 ;

[0051] Figure 7 The correction effect of the battery state of charge value under discharge conditions according to the implementation of the present application is Figure 2 .

[0052] Figure 8 A schematic diagram of the structure of a computer system of a terminal device or server according to an embodiment of the present application. DETAILED DESCRIPTION

[0053] The present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the relevant application, rather than to limit the application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present application. It should also be noted that, for ease of description, only the parts related to the application are shown in the accompanying drawings.

[0054] In the field of new energy electric vehicles, the power battery pack is composed of a series of battery packs. The state of charge of a series battery pack is an important indicator, that is, the ratio of the actual amount of power that can be provided in the current state to the amount of power that can be provided by a full charge, expressed as SOC (state of charge). The state of charge (SOC) is an important basis for the vehicle control system to formulate the optimal energy management strategy. Accurately estimating the state of charge (SOC) is of great significance for extending the life of the series battery pack, improving the safety and reliability of the series battery pack, and improving the performance of new energy electric vehicles.

[0055] The state of charge value is displayed on the client's display screen, which is convenient for users to view in real time. The state of charge value indicates the current remaining power of the series battery pack. The actual state of charge value is defined based on the rated capacity of the series battery pack and is used to indicate the actual remaining power of the series battery pack.

[0056] After the battery management system (BMS) of new energy electric vehicles is powered on, it will generally make a certain correspondence between the actual state of charge value and the state of charge display value, referred to as the mapping function. The use range of the SOC of automotive power batteries is generally 15%-95%. The state of charge display value is mapped with the actual state of charge value, and the use range of 80% of the automotive power battery SOC is stretched to 100% display. That is, 15% corresponds to 0, and 95% corresponds to 100%.

[0057] In order to improve the accuracy of the state of charge display value, the present invention provides a method for correcting the state of charge of a battery, which is used to correct the state of charge display value and improve the precision and accuracy of the state of charge display value, which is beneficial to prolonging the life of the series battery pack and improving the safety and reliability of the series battery pack.

[0058] Figure 1 A method for correcting the state of charge of a battery is shown, which comprises the following steps:

[0059] Step S10, obtaining the initial display value SOC of the state of charge of the series battery pack at the current moment n And the actual value of the state of charge SOC at the current moment m ;

[0060] S11, obtain the actual value of the state of charge SOC m .

[0061] The open circuit voltage method is used to obtain the true value of the battery state of charge SOC m The open circuit voltage method is only applicable to the parking state of new energy electric vehicles and cannot be estimated online and dynamically, that is, the open circuit voltage method cannot be used when new energy electric vehicles are in charging and discharging conditions. The open circuit voltage is the terminal voltage of the battery in the open circuit state, expressed as OCV (open circuit voltage). It is generally believed that after a long period of static standing (1h~3h) after charging or discharging, the battery has eliminated the polarization effect and reached a stable state. At this time, the voltage across the battery is the open circuit voltage.

[0062] Get the actual value of the state of charge SOC m The steps include:

[0063] Ⅰ. Obtain the voltage-battery capacity mapping curve established based on temperature and charge and discharge rate;

[0064] The battery cells of the series battery pack are used as the test counterparts, and the cut-off voltage is 3.0V~3.8V. The temperature is -10℃, 0℃, 10℃, 20℃, 30℃, 40℃, and 50℃, and the charge rate (discharge rate) is 0.1C, 0.2C, 0.3C, 0.4C, 0.5C, 0.6C, 0.7C, 0.8C, 0.9C and 1.0C. Select one of -10℃~50℃ and one of 0.1C~1.0C to obtain the corresponding voltage-battery capacity mapping curve.

[0065] refer to Figure 2 , obtain the voltage-battery capacity mapping curve corresponding to the discharge rate of 0.5C and the temperature of -10 ℃, the steps are as follows:

[0066] S111: Charge the battery to its upper voltage limit of 3.8V at -10°C.

[0067] S112: Place the fully charged battery in S111 in a -10 ℃ environment for 3 hours and record the current OCV value V 111 Then, discharge at a discharge rate of 0.5C to 3.7V, let it stand for 2 hours, and record the current OCV value V 112 and the current discharge capacity C 112 .

[0068] S113: Continue to discharge the battery treated in S112 at a discharge rate of 0.5C to 3.6V at the current temperature. After standing for 2 hours, record the current OCV value V 113 and the current discharge capacity C 113 .

[0069] S114: Continue to discharge the battery treated in S113 at a discharge rate of 0.5C to 3.5V at the current temperature. After standing for 2 hours, record the current OCV value V 114 and the current discharge capacity C 114 .

[0070] S115: Continue to discharge the battery treated in S114 at a discharge rate of 0.5C to 3.4V at the current temperature. After standing for 2 hours, record the current OCV value V 115 and the current discharge capacity C 115 .

[0071] S116: Continue to discharge the battery treated in S115 at a discharge rate of 0.5C to 3.3V at the current temperature. After standing for 2 hours, record the current OCV value V 116 and the current discharge capacity C 116 .

[0072] S117: Continue to discharge the battery treated in S116 at a discharge rate of 0.5C to 3.2V at the current temperature. After standing for 2 hours, record the current OCV value V 117 and the current discharge capacity C 117 .

[0073] S118: Continue to discharge the battery treated in S117 at a discharge rate of 0.5C to 3.1V at the current temperature. After standing for 2 hours, record the current OCV value V 118 and the current discharge capacity C 118 .

[0074] S119: Continue to discharge the battery treated in S118 at a discharge rate of 0.5C to 3.0V at the current temperature. After standing for 2 hours, record the current OCV value V 119 and the current discharge capacity C 119 .

[0075] According to the OCV value V recorded in the above steps 111 ~V 119 , discharge capacity C 112 ~C 119 , the SOC value can be converted, one SOC value corresponds to one OCV value, and then the voltage-battery capacity mapping curve is obtained.

[0076] II. According to the current temperature and current charge and discharge rate of the series-connected battery pack, a voltage-battery capacity mapping curve corresponding to the current temperature and the current charge and discharge rate is selected;

[0077] III. Obtain the open circuit voltage of the series-connected battery pack at the current temperature according to the working mode of the series-connected battery pack.

[0078] The open circuit voltage of the series battery group is obtained based on whether the discharge rate or charge rate of the series battery group changes by less than 0.1C within 1 minute. If the discharge rate or charge rate of the series battery group changes by less than 0.1C within 1 minute, the voltage across the series battery group is considered to be stable, and the voltage across the series battery group is the open circuit voltage of the series battery group. If the discharge rate or charge rate of the series battery group changes by more than 0.1C within 1 minute, the voltage across the series battery group is considered to be unstable, and the series battery group needs to remain stationary for a certain period of time until the voltage across the series battery group is stable.

[0079] IV. Based on the open circuit voltage at the current temperature and the voltage-battery capacity mapping curve corresponding to the current temperature and the current charge and discharge rate, the actual value of the state of charge SOC of the series battery pack at the current temperature is obtained m .

[0080] It should be noted that, considering the balance differences between the batteries in the series battery pack, the highest battery voltage that is first fully charged to the cut-off voltage is selected as the open circuit voltage under charging conditions, and the lowest battery voltage that is first discharged to the cut-off voltage is selected as the open circuit voltage under discharging conditions.

[0081] S12, obtain the initial display value SOC of the state of charge n .

[0082] The initial display value SOC of the state of charge is obtained by using the ampere-hour integration method n The ampere-hour integration method estimates the state of charge. During the charging process (discharging process), the charge change value is obtained by integrating the discharge rate (charging rate) over time.

[0083] ,

[0084] Among them, SOC o is the initial value of the state of charge; is the battery capacity; Is the charge or discharge rate.

[0085] However, the estimation accuracy of the ampere-hour integration method depends largely on the initial value of the state of charge SOC o For the initial value of the state of charge SOC o ,Due to the inaccurate current value collection, the error will continue to accumulate, resulting in inaccurate battery SOC value estimation.

[0086] Step S20: according to the actual value of the state of charge SOC m And the initial display value of the state of charge SOC n Calculate the error power;

[0087] According to step S10, the initial display value SOC of the state of charge of the series battery pack at the current moment is obtained. n And the actual value of the state of charge SOC at the current moment m , the initial display value of the current state of charge SOC n The actual value of the state of charge SOC at the current moment m The difference is multiplied by the battery capacity C of the series battery pack to obtain the error power.

[0088] Step S30: according to the actual value of the state of charge SOC m and the working mode of the series battery pack to determine the remaining compensation time;

[0089] The working mode of the series battery pack includes charging condition and discharging condition.

[0090] Under charging conditions, the series battery pack does not reach the maximum voltage, that is, the initial display value of the state of charge SOCn <100%, the initial display value of the state of charge SOC n The first remaining compensation time from full charge to 100% is T1,

[0091]

[0092] Among them, C is the battery capacity and I is the charging rate.

[0093] Under discharge conditions, the series battery pack does not reach the minimum discharge voltage, that is, the initial display value of the state of charge SOC n >0%, the initial display value of the state of charge SOC n The second remaining compensation time T2 from emptying to 0%,

[0094]

[0095] Among them, C is the battery capacity and I is the discharge rate.

[0096] It should be noted that during the remaining compensation time, the initial value SOC of the state of charge is adjusted according to the compensation power. n Before making corrections, the initial display value of the state of charge SOC n Greater than or equal to the first threshold, or the initial display value of the state of charge SOC n is less than or equal to the second threshold.

[0097] Initial display value SOC n When the value is greater than or equal to the first threshold, the initial display value SOC of the state of charge is adjusted according to the compensation power n The first threshold is the threshold for correction set by the series battery pack in charging mode, and the first threshold is 80%. n ≥80%, the initial display value of the state of charge SOC n Correction.

[0098] Initial display value SOC n When the charge level is less than or equal to the second threshold, the initial display value SOC of the state of charge is adjusted according to the compensation power. n The second threshold is a threshold for correction set when the series battery pack is in discharge mode. The second threshold is 20%. n When ≤20%, the initial display value SOC of the state of charge n Correction.

[0099] refer to Figure 3 Step S40: During the remaining compensation time, the initial display value SOC of the state of charge is uniformly displayed according to the working mode of the series battery pack and the error power. nCorrection is performed to obtain the corrected current state of charge display value SOC k .

[0100] The initial display value SOC of the state of charge is determined based on the working mode and error power of the series battery pack n The correction includes the following steps:

[0101] S41, determining a compensation ratio relationship according to the battery power display interval and the remaining compensation time;

[0102] △t is the time interval from the state of charge display value at the next moment to the state of charge display value at the current moment.

[0103] S42, determining the compensation power Q according to the relationship between the error power and the compensation ratio. Under the charging or discharging condition, the compensation power Q is:

[0104]

[0105] Where, T is T1 or T2, C is the battery capacity, The initial display value SOC of the current state of charge n The actual value of the state of charge SOC at the current moment m The difference.

[0106] S43, the initial display value SOC of the state of charge according to the working mode and compensation power of the series battery pack n Make corrections.

[0107] S431, calculating the percentage of the compensation power Q to the battery capacity C;

[0108] S432, the percentage is compared with the initial display value SOC of the state of charge n The sum of the state of charge is used to modify the displayed value SOC k ;

[0109]

[0110] like Figure 4 As shown, under charging conditions, the actual value of the state of charge SOC m <Initial display value of state of charge SOC n ; if △SOC is negative, the compensation power Q is negative, then the initial display value SOC will be n Subtract the compensation power from the upper limit to slow down the initial display value SOC of the state of charge n Increases, thus forming a charge state modification display value SOC k .

[0111] like Figure 5 As shown, under charging conditions, the actual value of the state of charge SOCm >Initial display value of state of charge SOC n ; if △SOC is positive, the compensation power Q is positive, then the compensation power Q will be added to the initial display value of the state of charge, accelerating the initial display value SOC n Increases, thus forming a charge state modification display value SOC k .

[0112] like Figure 6 As shown, under discharge conditions, the actual value of the state of charge SOC m <Initial display value of state of charge SOC n ; if △SOC is negative, the compensation power Q is negative, then the compensation power Q will be subtracted from the initial display value of the state of charge, accelerating the initial display value of the state of charge SOC n Decreases, thus forming a charge state modification display value SOC k .

[0113] like Figure 7 As shown, under discharge conditions, the actual value of the state of charge SOC m >Initial display value of state of charge SOC n ; if △SOC is positive, the compensation power Q is positive, then the compensation power Q will be added to the initial display value of the state of charge to slow down the initial display value SOC n Decreases, thus forming a charge state modification display value SOC k decline.

[0114] Compared with the related art, the method for correcting the battery state of charge of the present invention has the following advantages:

[0115] 1. The voltage-battery capacity mapping curve established in this scheme takes into account the two factors of temperature and charge and discharge rate to establish a binary mapping relationship, which has a higher fit with the actual state of charge.

[0116] 2. This solution can display the initial value of the state of charge SOC under charging and discharging conditions. n ≤20%, initial display value of state of charge SOC n ≥80%, initial display value SOC for state of charge n The scope of correction is wide.

[0117] 3. The initial display value SOC of the state of charge under charging and discharging conditions of this solution n Greater than the actual value of the state of charge SOC m , or the initial display value of the state of charge SOC n Less than the actual value of the state of charge SOC m All of them can be smoothed by compensating the power before reaching the cut-off voltage to avoid SOC step jumps, and the SOC smoothing effect is good.

[0118] The present invention also provides a device for correcting the battery state of charge, the device for correcting the battery state of charge comprising:

[0119] An acquisition unit, used to acquire an initial display value of the state of charge of the series-connected battery pack at the current moment and a real value of the state of charge at the current moment;

[0120] A calculation unit, used for calculating the error power according to the actual value of the state of charge and the initial display value of the state of charge;

[0121] A determination unit, used to determine the remaining compensation time according to the actual value of the state of charge and the working mode of the series battery pack;

[0122] The correction unit is used to correct the initial display value of the state of charge by using the error power within the remaining compensation time to obtain the corrected modified display value of the state of charge at the current moment.

[0123] The device provided in the embodiment of the present application includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the program, the method for determining the estimated arrival time as described above is implemented. Figure 8 , Figure 8 A schematic diagram of the structure of a computer system of a terminal device or server according to an embodiment of the present application.

[0124] like Figure 8 As shown, the computer system 1300 includes a central processing unit (CPU) 1301, which can perform various appropriate actions and processes according to a program stored in a read-only memory (ROM) 1302 or a program loaded from a storage part 1303 to a random access memory (RAM) 1303. In the RAM 1303, various programs and data required for the operation of the system 1300 are also stored. The CPU 1301, the ROM 1302, and the RAM 1303 are connected to each other through a bus 1304. An input / output (I / O) interface 1305 is also connected to the bus 1304.

[0125] The following components are connected to the I / O interface 1305: an input section 1306 including a keyboard, a mouse, etc.; an output section 1307 including a cathode ray tube (CRT), a liquid crystal display (LCD), etc., and a speaker, etc.; a storage section 1308 including a hard disk, etc.; and a communication section 1309 including a network interface card such as a LAN card, a modem, etc. The communication section 1309 performs communication processing via a network such as the Internet. A drive 1310 is also connected to the I / O interface 1305 as needed. A removable medium 1311, such as a magnetic disk, an optical disk, a magneto-optical disk, a semiconductor memory, etc., is installed on the drive 1310 as needed, so that a computer program read therefrom is installed into the storage section 1308 as needed.

[0126] In particular, according to an embodiment of the present application, the process described above with reference to the flowchart can be implemented as a computer software program. For example, an embodiment of the present application includes a computer program product, which includes a computer program carried on a machine-readable medium, and the computer program includes a program code for executing the method shown in the flowchart. In such an embodiment, the computer program can be downloaded and installed from the network through the communication part 1303, and / or installed from the removable medium 1311. When the computer program is executed by the central processing unit (CPU) 1301, the above-mentioned functions defined in the system of the present application are executed.

[0127] It should be noted that the computer-readable medium shown in the present application may be a computer-readable signal medium or a computer-readable storage medium or any combination of the above two. The computer-readable storage medium may be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device or device, or any combination of the above. More specific examples of computer-readable storage media may include, but are not limited to: an electrical connection with one or more wires, 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 above. In the present application, a computer-readable storage medium may be any tangible medium containing or storing a program that can be used by or in combination with an instruction execution system, device or device. In the present application, a computer-readable signal medium may include a data signal propagated in a baseband or as part of a carrier wave, which carries a computer-readable program code. This propagated data signal may take a variety of forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the above. Computer-readable signal media may also be any computer-readable medium other than computer-readable storage media, which may send, propagate or transmit a program for use by or in conjunction with an instruction execution system, apparatus or device. The program code contained on the computer-readable medium may be transmitted using any appropriate medium, including but not limited to: wireless, wire, optical cable, RF, etc., or any suitable combination of the above.

[0128] The flow chart and block diagram in the accompanying drawings illustrate the possible architecture, function and operation of the system, method and computer program product according to various embodiments of the present application. In this regard, each box in the flow chart or block diagram can represent a module, a program segment or a part of the code, and the aforementioned module, program segment or a part of the code contains one or more executable instructions for realizing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in a different order from the order marked in the accompanying drawings. For example, two boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram and / or flow chart, and the combination of the boxes in the block diagram and / or flow chart can be implemented with a dedicated hardware-based system that performs the specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions.

[0129] The units or modules involved in the embodiments described in the present application may be implemented by software or by hardware. The described units or modules may also be set in a processor, for example, may be described as: a processor comprising: an acquisition unit, a calculation unit, a determination unit, and a correction unit. Among them, the names of these units or modules do not constitute a limitation on the unit or module itself under certain circumstances. For example, the acquisition unit may also be described as a unit "for obtaining the initial display value of the state of charge of the series battery pack at the current moment and the actual value of the state of charge at the current moment".

[0130] As another aspect, the present application also provides a computer-readable storage medium, which may be included in the electronic device described in the above embodiment; or it may exist independently and not be assembled into the electronic device. The above computer-readable storage medium stores one or more programs, and when the above programs are used by one or more processors to execute the method for determining the estimated arrival time described in the present application: obtaining the section features of each section in the route to be estimated; allocating attention weights to the section features of each section to obtain the route features of the route to be estimated; and using the route features to predict the estimated arrival time corresponding to the route to be estimated.

[0131] In summary, the method, device, equipment and medium for correcting the battery state of charge provided in this embodiment obtains the initial display value of the state of charge of the series battery pack at the current moment and the actual value of the state of charge at the current moment; calculates the error power according to the actual value of the state of charge and the initial display value of the state of charge; determines the remaining compensation time according to the actual value of the state of charge and the working mode of the series battery pack; during the remaining compensation time, the initial display value of the state of charge is corrected according to the working mode of the series battery pack and the error power, and the corrected state of charge display value at the current moment is obtained. The initial display value SOC of the state of charge that appears under charging and discharging conditions in this scheme n Greater than the actual value of the state of charge SOC m , or the initial display value of the state of charge SOC n Less than the actual value of the state of charge SOC m All of them can be smoothed by compensating the power before reaching the cut-off voltage to avoid SOC step jumps, and the SOC smoothing effect is good.

[0132] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the above features are replaced with the technical features with similar functions disclosed in this application (but not limited to) by each other.

Claims

1. A method for correcting a battery state of charge, characterized in that: include: Obtain the initial displayed value of the state of charge of the series battery pack at the current moment and the actual value of the state of charge at the current moment; Calculating the error power according to the actual value of the state of charge and the initial display value of the state of charge; Determining the remaining compensation time according to the initial display value of the state of charge and the working mode of the series battery pack; During the remaining compensation time, the initial display value of the state of charge is corrected according to the working mode of the series battery pack and the error power, so as to obtain a corrected modified display value of the state of charge at the current moment; wherein, the correcting the initial display value of the state of charge according to the working mode of the series battery pack and the error power includes: Determine the compensation ratio relationship according to the battery power display interval and the remaining compensation time; determine the compensation power according to the error power and the compensation ratio relationship, and the compensation power is Q: Among them, △t is the battery power display interval time, T is the remaining compensation time, is the difference between the initial displayed value of the state of charge at the current moment and the actual value of the state of charge at the current moment, and C is the battery capacity; The initial state of charge display value is corrected according to the working mode of the series battery pack and the compensation power to obtain a modified state of charge display value SOC k for: Among them, SOC n It is the initial display value of the state of charge.

2. The method for correcting the battery state of charge according to claim 1, characterized in that: The initial display value of the state of charge is corrected according to the working mode of the series battery pack and the compensation power, including: When the working mode of the series battery pack is the charging mode and the error power is a positive number, the ratio of the compensation power to the battery capacity is added to the initial display value of the state of charge; When the working mode of the series battery pack is the charging mode and the error power is a negative number, the ratio of the compensation power to the battery capacity is subtracted from the initial display value of the state of charge; When the working mode of the series battery pack is the discharge mode and the error power is a positive number, the ratio of the compensation power to the battery capacity is added to the initial display value of the state of charge; When the working mode of the series battery pack is the discharge mode and the error power is a negative number, the ratio of the compensation power to the battery capacity is subtracted from the initial display value of the state of charge.

3. The method for correcting the battery state of charge according to claim 1, characterized in that: During the remaining compensation time, before correcting the initial display value of the state of charge according to the compensation quantity, the method further includes: When the initial display value of the state of charge is greater than or equal to a first threshold, the initial display value of the state of charge is corrected according to the compensation power, and the first threshold is a threshold set by the series battery pack in the charging mode for triggering correction; or When the initial state of charge display value is less than or equal to a second threshold, the initial state of charge display value is corrected according to the compensation power, and the second threshold is a threshold set by the series battery pack in the discharge mode for triggering correction.

4. The method for correcting the battery state of charge according to claim 1, characterized in that: Determining the remaining compensation time according to the initial display value of the state of charge and the working mode of the series battery pack includes: When the operation mode of the series battery group is the charging mode, determining the time required for the series battery group to be charged from the initial display value of the state of charge to the full state of the series battery group as the remaining compensation time; When the operation mode of the series-connected battery group is the discharge mode, the time required for the series-connected battery group to discharge from the initial display value of the state of charge to the empty state of the series-connected battery group is determined as the remaining compensation time.

5. The method for correcting the battery state of charge according to claim 1, characterized in that: The obtaining of the true value of the state of charge of the series-connected battery pack at the current moment includes: Obtain a voltage-battery capacity mapping curve established based on temperature; According to the current temperature of the series-connected battery pack, a voltage-battery capacity mapping curve corresponding to the current temperature is selected; Acquire the open circuit voltage of the series-connected battery group at the current temperature according to the working mode of the series-connected battery group; Based on the open circuit voltage at the current temperature and the voltage-battery capacity mapping curve corresponding to the current temperature, the true value of the state of charge of the series battery pack at the current temperature is obtained.

6. The method for correcting the battery state of charge according to claim 1, characterized in that: The obtaining of the true value of the state of charge of the series-connected battery pack at the current moment also includes: Obtain a voltage-battery capacity mapping curve established based on temperature and charge and discharge rate; According to the current temperature and the current charge and discharge rate of the series battery pack, a voltage-battery capacity mapping curve corresponding to the current temperature and the current charge and discharge rate is selected; Acquire the open circuit voltage of the series-connected battery group at the current temperature according to the working mode of the series-connected battery group; Based on the open circuit voltage at the current temperature and the voltage-battery capacity mapping curve corresponding to the current temperature and the current charge and discharge rate, the true value of the state of charge of the series battery pack at the current temperature is obtained.

7. A device for correcting battery state of charge, characterized in that: The device is used to execute the method for correcting the battery state of charge according to any one of claims 1 to 6, and the device comprises: An acquisition unit, used to acquire an initial display value of the state of charge of the series-connected battery pack at the current moment and a real value of the state of charge at the current moment; A calculation unit, configured to calculate an error electric quantity according to the true value of the state of charge and the initial display value of the state of charge; a determination unit, configured to determine a remaining compensation time according to the initial display value of the state of charge and an operation mode of the series battery pack; The correction unit is used to uniformly correct the initial display value of the state of charge by using the error electric quantity within the remaining compensation time to obtain a corrected modified display value of the state of charge at the current moment.

8. A terminal device, characterized in that: The terminal device includes a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor is configured to implement the method for correcting the battery state of charge as described in any one of claims 1 to 6 when executing the program.

9. A computer-readable storage medium having a computer program stored thereon, wherein the computer program is used to implement the method for correcting the battery state of charge as claimed in any one of claims 1 to 6.

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