SOC correction method, device and vehicle terminal

Abstract

The application discloses a SOC correction method, device and vehicle-mounted terminal. In the process of charging a target vehicle, the charging parameters and the current SOC of the target vehicle are acquired, the charging parameters including the single battery voltage of the battery pack of the target vehicle, the average module temperature, the actual charging current and the charging request current. In the case that the charging request current meets the target condition, the dynamic correction SOC and the SOC correction weight are determined based on the charging parameters, and finally the target SOC is determined based on the current SOC, the dynamic correction SOC and the SOC correction weight. The target SOC is the SOC after the current SOC is corrected, and the authenticity of the target SOC is higher.

Description

Technical Field

[0001] This application belongs to the field of vehicle technology, and particularly relates to a method, apparatus and vehicle terminal for correcting a System-on-Chip (SOC). Background Technology

[0002] With the development of new energy vehicle technology, power batteries provide power for vehicle drive components and smart cockpits. The accuracy of residual energy assessment plays an important role in user experience, vehicle performance, and battery maintenance.

[0003] Regarding SOC (State of Charge), there exists a true SOC value for the battery and a SOC value displayed on the instrument panel. When a vehicle is charging via DC or AC, the instrument panel will force the displayed SOC to reach 100% when full charge is achieved. Without window mapping, the true SOC value should be equal to or close to the displayed SOC value. Current SOC correction schemes typically force the displayed SOC to 100% at the end of a full charge. If the displayed SOC is lower than the true SOC, a jump in SOC will occur during full charge; if the displayed SOC is higher, there may be a prolonged period where the displayed SOC equals 100% without the charging process stopping.

[0004] The above phenomenon can easily lead users to believe that the battery pack is not fully charged or is overcharged, affecting the user's driving experience. Summary of the Invention

[0005] This application discloses a method, apparatus, and vehicle terminal for correcting SOC, which can improve the authenticity of the displayed SOC.

[0006] On one hand, embodiments of this application provide a method for correcting a System of Costs (SOC), the method comprising:

[0007] During the charging process of the target vehicle, the charging parameters and current SOC of the target vehicle are obtained. The charging parameters include the individual cell voltage, average module temperature, actual charging current and charging request current of the target vehicle's battery pack.

[0008] If the charging request current meets the target current condition, the dynamically corrected SOC of the battery pack of the target vehicle is determined based on the average module temperature and the individual cell voltage.

[0009] Based on the charging parameters and the charging correction time of the target vehicle's battery pack, the SOC correction weight is determined.

[0010] Based on the current SOC, the dynamically corrected SOC, and the SOC correction weight, a target SOC is determined after correcting the current SOC.

[0011] In one possible implementation, determining the dynamically corrected SOC of the target vehicle's battery pack based on the average module temperature and the individual cell voltage includes:

[0012] The average module temperature and the individual cell voltage are substituted into the first relational data to obtain the dynamically corrected SOC of the battery pack of the target vehicle. The first relational data is obtained based on the first dynamic correction table, which records the correspondence between module temperature, individual cell voltage and dynamically corrected SOC.

[0013] In one possible implementation, determining the SOC correction weight based on the charging parameters and the charging correction time of the target vehicle's battery pack includes:

[0014] The voltage correction weight is determined based on the individual cell voltage and the average module temperature;

[0015] Based on the average module temperature, determine the temperature correction weight;

[0016] The polarization correction weight is determined based on the charging correction time and the charging request current.

[0017] Based on the actual charging current and the charging request current, determine the current correction weight;

[0018] The SOC correction weight is determined based on the voltage correction weight, the temperature correction weight, the polarization correction weight, and the current correction weight.

[0019] In one possible implementation, determining the voltage correction weight based on the individual cell voltage and the average module temperature includes:

[0020] Based on the individual cell voltage and the average module temperature, a corrected reference voltage is determined;

[0021] The voltage correction weight is determined based on the individual cell voltage and the correction reference voltage.

[0022] In one possible implementation, determining the corrected reference voltage based on the individual cell voltage and the average module temperature includes:

[0023] Substituting the individual cell voltage and the average module temperature into the second relationship data, the corrected reference voltage is obtained. The second relationship data is obtained based on the second dynamic correction table, which records the correspondence between the module temperature, the individual cell voltage, and the corrected reference voltage.

[0024] The process of determining the voltage correction weight based on the individual cell voltage and the corrected reference voltage includes:

[0025] The voltage correction weight is determined based on the difference between the individual cell voltage and the corrected reference voltage.

[0026] In one possible implementation, determining the temperature correction weight based on the average module temperature includes:

[0027] Based on the average module temperature, determine the module reference temperature;

[0028] The temperature correction weight is determined based on the difference between the average module temperature and the module reference temperature.

[0029] In one possible implementation, determining the polarization correction weight based on the charging correction time and the charging request current includes:

[0030] The polarization correction weight is obtained by substituting the charging correction time and the charging request current into the third relational data. The third relational data is obtained based on the third dynamic correction table, which records the correspondence between the charging correction time, the charging request current, and the polarization weight.

[0031] In one possible implementation, determining the current correction weight based on the actual charging current and the charging request current includes:

[0032] The current correction weight is determined based on the difference between the actual charging current and the charging request current.

[0033] In one possible implementation, determining the target SOC after correcting the current SOC based on the current SOC, the dynamically corrected SOC, and the SOC correction weight includes:

[0034] Subtract the dynamically corrected SOC from the current SOC to obtain the difference SOC;

[0035] Multiply the difference SOC by the SOC correction weight to obtain the target corrected SOC;

[0036] The current SOC is added to the target modified SOC to obtain the target SOC.

[0037] On one hand, embodiments of this application provide a SOC correction apparatus, the apparatus comprising:

[0038] The charging parameter acquisition module is used to acquire the charging parameters and current SOC of the target vehicle during the charging process. The charging parameters include the individual cell voltage, average module temperature, actual charging current, and charging request current of the target vehicle's battery pack.

[0039] The dynamic correction SOC determination module is used to determine the dynamic correction SOC of the battery pack of the target vehicle based on the average module temperature and the individual cell voltage, provided that the charging request current meets the target current condition.

[0040] The SOC correction weight determination module is used to determine the SOC correction weight based on the charging parameters and the charging correction time of the battery pack of the target vehicle.

[0041] The target SOC determination module is used to determine the target SOC after correcting the current SOC based on the current SOC, the dynamically corrected SOC, and the SOC correction weight.

[0042] In one possible implementation, the dynamic correction SOC determination module is used to substitute the average module temperature and the individual cell voltage into first relational data to obtain the dynamic correction SOC of the battery pack of the target vehicle. The first relational data is obtained based on a first dynamic correction table, which records the correspondence between module temperature, individual cell voltage, and dynamic correction SOC.

[0043] In one possible implementation, the SOC correction weight determination module is configured to determine a voltage correction weight based on the individual battery voltage and the average module temperature; determine a temperature correction weight based on the average module temperature; determine a polarization correction weight based on the charging correction time and the charging request current; determine a current correction weight based on the actual charging current and the charging request current; and determine the SOC correction weight based on the voltage correction weight, the temperature correction weight, the polarization correction weight, and the current correction weight.

[0044] In one possible implementation, the SOC correction weight determination module is used to determine a correction reference voltage based on the individual cell voltage and the average module temperature; and to determine the voltage correction weight based on the individual cell voltage and the correction reference voltage.

[0045] In one possible implementation, the SOC correction weight determination module is used to substitute the individual cell voltage and the average module temperature into second relational data to obtain the correction reference voltage. The second relational data is obtained based on a second dynamic correction table, which records the correspondence between module temperature, individual cell voltage, and correction reference voltage. Determining the voltage correction weight based on the individual cell voltage and the correction reference voltage includes determining the voltage correction weight based on the difference between the individual cell voltage and the correction reference voltage.

[0046] In one possible implementation, the SOC correction weight determination module is used to determine a module reference temperature based on the average module temperature; and to determine the temperature correction weight based on the difference between the average module temperature and the module reference temperature.

[0047] In one possible implementation, the SOC correction weight determination module is used to substitute the charging correction time and the charging request current into the third relational data to obtain the polarization correction weight. The third relational data is obtained based on a third dynamic correction table, which records the correspondence between the charging correction time, the charging request current, and the polarization weight.

[0048] In one possible implementation, the SOC correction weight determination module is used to determine the current correction weight based on the difference between the actual charging current and the charging request current.

[0049] In one possible implementation, the target SOC determination module is configured to subtract the dynamically corrected SOC from the current SOC to obtain a difference SOC; multiply the difference SOC by the SOC correction weight to obtain a target corrected SOC; and add the current SOC to the target corrected SOC to obtain the target SOC.

[0050] On the one hand, a vehicle-mounted terminal is provided, the vehicle-mounted terminal comprising:

[0051] At least one processor and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, the instructions being executed by the at least one processor to enable the at least one processor to perform the aforementioned SOC correction method.

[0052] On the one hand, there is a non-transitory computer-readable storage medium that stores computer instructions for causing the computer to perform the aforementioned SOC correction method.

[0053] On the one hand, embodiments of this application also provide a computer program product, which includes a computing program stored on a non-transitory computer-readable storage medium. The computer program includes program instructions that, when executed by an in-vehicle terminal, cause the in-vehicle terminal to perform the aforementioned SOC correction method.

[0054] The technical solution provided in this application acquires the charging parameters and current State of Charge (SOC) of a target vehicle during the charging process. These charging parameters include the individual cell voltages, average module temperature, actual charging current, and requested charging current of the target vehicle's battery pack. If the requested charging current meets the target conditions, a dynamically corrected SOC and a SOC correction weight are determined based on these charging parameters. Finally, a target SOC is determined based on the current SOC, the dynamically corrected SOC, and the SOC correction weight. This target SOC is the corrected SOC from the current SOC, and its accuracy is high. Attached Figure Description

[0055] To more clearly illustrate the technical solution of this application and to facilitate a further understanding of the technical effects, technical features and objectives of this application, the application will be described in detail below with reference to the accompanying drawings. The drawings constitute an essential part of the specification and are used together with the first embodiment of this application to illustrate the technical solution of this application, but do not constitute a limitation on this application.

[0056] Figure 1 A schematic diagram of an implementation environment provided for an embodiment of this application;

[0057] Figure 2 A flowchart illustrating a method for correcting a State of Charge (SOC) provided in an embodiment of this application;

[0058] Figure 3 A flowchart illustrating another SOC correction method provided in this application embodiment;

[0059] Figure 4 A flowchart illustrating yet another SOC correction method provided in this application embodiment;

[0060] Figure 5 A schematic diagram of a SOC correction device provided in an embodiment of this application;

[0061] Figure 6 This is a schematic diagram of the structure of a vehicle-mounted terminal provided in an embodiment of this application. Detailed Implementation

[0062] The following specific examples illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. This application can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this application. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0063] It should be noted that various aspects of embodiments within the scope of the appended claims are described below. It will be apparent that the aspects described herein can be embodied in a wide variety of forms, and any particular structure and / or function described herein is merely illustrative. Based on this application, those skilled in the art will understand that one aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number of aspects set forth herein can be used to implement an apparatus and / or a method of practice.

[0064] It should also be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of this application. The drawings only show the components related to this application and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the shape, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0065] Furthermore, specific details are provided in the following description to facilitate a thorough understanding of the examples. However, those skilled in the art will understand that the aspects described can be practiced without these specific details.

[0066] CAN (Controller Area Network): CAN is designed for microcontroller communication in a vehicle environment, exchanging information between various electronic control units (ECUs) to form a vehicle electronic control network. For example, CAN control devices are embedded in engine management systems, transmission controllers, instrument clusters, and electronic backbone systems. Theoretically, an unlimited number of nodes can be connected to a single CAN bus network. In practical applications, the number of nodes is limited by the electrical characteristics of the network hardware. For example, when using a Philips P82C250 as a CAN transceiver, 110 nodes are allowed to be connected to the same network. CAN can provide data transmission rates up to 1 Mbit / s, making real-time control very easy. Furthermore, the hardware's error detection features enhance CAN's immunity to electromagnetic interference.

[0067] SOC: Battery SOC (State of Charge) reflects the remaining capacity of a battery. It is numerically defined as the ratio of remaining capacity to the battery's total capacity, usually expressed as a percentage. Its value ranges from 0 to 1. When SOC = 0, the battery is fully discharged; when SOC = 1, the battery is fully charged.

[0068] Battery module: When multiple battery cells are packaged together in the same housing frame and connected to the outside through a unified boundary, this forms a module.

[0069] Battery cell: also known as a battery cell, is the basic unit that realizes the interconversion of chemical energy and electrical energy. It consists of positive electrode, negative electrode, separator, electrolyte, battery case, battery cover and terminals.

[0070] Figure 1 This is a schematic diagram illustrating the implementation environment of the SOC modification method provided in this application embodiment. See also... Figure 1 The implementation environment includes an on-board terminal 110 and a sensor set 140.

[0071] The vehicle-mounted terminal 110 is used to control the target vehicle. In this embodiment, the vehicle-mounted terminal 110 is also referred to as the vehicle controller (VCU), engine controller (EMS), or transmission controller (TCU), etc., and is used to correct the SOC. This embodiment does not limit the specific application to this type of terminal.

[0072] Sensor set 140 is used to acquire vehicle information of the target vehicle, and sensor set 140 includes a variety of sensors.

[0073] The vehicle terminal 110 is connected to the sensor set 140 via wired or wireless means.

[0074] After introducing the implementation environment of the embodiments of this application, the application scenarios of the embodiments of this application will be described below.

[0075] The technical solution provided in this application can be applied to any electric or hybrid vehicle, particularly a vehicle that combines an electric motor and an engine. After using the technical solution provided in this application, during the charging process of the target vehicle, the charging parameters and current State of Charge (SOC) of the target vehicle can be obtained. These charging parameters include the individual cell voltages, average module temperature, actual charging current, and requested charging current of the target vehicle's battery pack. If the requested charging current meets the target conditions, the dynamically corrected SOC of the target vehicle's battery pack is determined based on the average module temperature and the individual cell voltage. Based on the charging parameters and the charging correction time, a SOC correction weight is determined. Finally, based on the current SOC, the dynamically corrected SOC, and the SOC correction weight, the current SOC is corrected to obtain the target SOC, which accurately reflects the remaining charge of the battery module.

[0076] After introducing the implementation environment and application scenarios of the embodiments of this application, the following describes the SOC modification method provided by the embodiments of this application. See [link to relevant documentation]. Figure 2 Taking the vehicle-mounted terminal as the executing entity as an example, the method includes:

[0077] 201. During the charging process of the target vehicle, the vehicle terminal obtains the charging parameters and current SOC of the target vehicle. The charging parameters include the individual cell voltage, average module temperature, actual charging current and charging request current of the target vehicle's battery pack.

[0078] The target vehicle is the vehicle whose State of Charge (SOC) needs to be corrected. Charging the target vehicle refers to charging it using a charging station or adapter. The current SOC is the estimated SOC, representing the remaining charge of the target vehicle's battery pack. The individual cell voltage of the battery pack refers to the voltage of a single cell within a battery module of the battery pack. A battery pack comprises multiple battery modules, and a battery module comprises multiple individual cells. The average module temperature refers to the average temperature of the multiple battery modules within the battery pack. The actual charging current refers to the actual current used when charging the target vehicle. The charging request current refers to the charging current requested by the onboard terminal from the charging station.

[0079] 202. When the charging request current meets the target current condition, the vehicle terminal determines the dynamic corrected SOC of the battery pack of the target vehicle based on the average module temperature and the individual battery voltage.

[0080] The requirement that the requested charging current meets the target current condition means that the requested charging current is either a first multiplier current or a second multiplier current, where the first multiplier current and the second multiplier current are different. In some embodiments, the first multiplier current is 0.33C, and the second multiplier current is 0.5C. The dynamic SOC correction is used to correct the current SOC.

[0081] 203. The vehicle terminal determines the SOC correction weight based on the charging parameters and the charging correction time of the target vehicle's battery pack.

[0082] The charging correction time of the battery pack is used to correct the remaining charging time of the battery pack, and the SOC correction weight is used to correct the current SOC.

[0083] 204. The vehicle terminal determines the target SOC after correcting the current SOC based on the current SOC, the dynamically corrected SOC, and the SOC correction weight.

[0084] The target SOC is the corrected SOC, which is more accurate than the current SOC.

[0085] The technical solution provided in this application acquires the charging parameters and current State of Charge (SOC) of a target vehicle during the charging process. These charging parameters include the individual cell voltages, average module temperature, actual charging current, and requested charging current of the target vehicle's battery pack. If the requested charging current meets the target conditions, a dynamically corrected SOC and a SOC correction weight are determined based on these charging parameters. Finally, a target SOC is determined based on the current SOC, the dynamically corrected SOC, and the SOC correction weight. This target SOC is the corrected SOC from the current SOC, and its accuracy is high.

[0086] Steps 201-204 above are a simplified description of the SOC correction method provided in the embodiments of this application. The following will provide a detailed description of the SOC correction method provided in the embodiments of this application, using some examples. See [link to relevant documentation]. Figure 3 The methods include:

[0087] 301. During the charging process of the target vehicle, the vehicle terminal acquires the charging parameters and current SOC of the target vehicle. The charging parameters include the individual cell voltage, average module temperature, actual charging current and charging request current of the target vehicle's battery pack.

[0088] The target vehicle is the vehicle whose State of Charge (SOC) needs to be corrected. Charging the target vehicle refers to charging it using a charging station or adapter. The current SOC is the estimated SOC, representing the remaining charge of the target vehicle's battery pack. The individual cell voltage of the battery pack refers to the voltage of a single cell within a battery module of the battery pack. A battery pack includes multiple battery modules, and a battery module includes multiple individual cells. The average module temperature refers to the average temperature of the multiple battery modules in the battery pack. The actual charging current refers to the actual current used when charging the target vehicle. The charging request current refers to the charging current requested by the on-board terminal from the charging station. In some embodiments, the battery pack material of the target vehicle is lithium iron phosphate.

[0089] In one possible implementation, during the charging process of the target vehicle, the on-board terminal acquires the individual cell voltages, average module temperature, actual charging current, charging request current, and current SOC of the target vehicle's battery pack through various sensors. These sensors include voltage sensors, temperature sensors, and current sensors, among others. The current SOC of the target vehicle is estimated by the on-board terminal based on the vehicle's charging parameters; this is the SOC to be displayed. The SOC correction method provided in this application aims to correct this current SOC, making the corrected SOC closer to the actual SOC of the battery pack. The method for estimating the current SOC based on charging parameters can be any of the related technologies, and this application does not limit this approach.

[0090] In this implementation, during the charging process of the target vehicle, the on-board terminal can acquire the charging parameters and current SOC of the target vehicle through a variety of sensors, and the acquisition efficiency of charging parameters and current SOC is high.

[0091] 302. When the charging request current meets the target current condition, the vehicle terminal determines the dynamic corrected SOC of the battery pack of the target vehicle based on the average module temperature and the individual battery voltage.

[0092] The requirement that the requested charging current meets the target current condition means that the requested charging current is either a first multiplier current or a second multiplier current, where the first multiplier current and the second multiplier current are different. In some embodiments, the first multiplier current is 0.33C, and the second multiplier current is 0.5C. The dynamic SOC correction is used to correct the current SOC.

[0093] In one possible implementation, when the charging request current meets the target current condition, the vehicle terminal substitutes the average module temperature and the individual battery voltage into the first relational data to obtain the dynamically corrected SOC of the battery pack of the target vehicle. The first relational data is obtained based on the first dynamic correction table, which records the correspondence between module temperature, individual battery voltage and dynamically corrected SOC.

[0094] In this implementation, when the charging request current meets the target conditions, the vehicle terminal can directly substitute the average module temperature and the single cell voltage into the first relational data. The dynamically corrected SOC can be directly obtained through the first relational data, and the efficiency of obtaining the dynamically corrected SOC is relatively high.

[0095] The first dynamic correction table was obtained through multiple rounds of implementation, and the experimental process is described below.

[0096] Data on the full-charge cutoff voltage (3.650V) of individual cells were obtained under different temperatures and currents. Five individual cells from the same batch as the battery pack were selected. The experimental steps are described below.

[0097] Step 1: Full charge at room temperature (25 degrees Celsius), using 0.33C to charge to 3.650V.

[0098] Step 2: Discharge at 0.33C until the cutoff voltage is 2.5V.

[0099] Step 3: Set the temperature of the constant temperature chamber to the specified temperature (the temperatures to be tested are 0℃, 10℃, 25℃, and 55℃ respectively), let it stand for 6 hours, and ensure that the temperature difference between the module and the set temperature of the constant temperature chamber is less than 2℃.

[0100] Step 4: Charge the batteries to the specified current (currents need to be tested separately: 0.5C and 0.33C) until the cutoff voltage is 3.650V, and then let them stand at room temperature for 2 hours.

[0101] Step 5: Return to Step 1 and adjust the temperature of the constant temperature chamber or the charging current.

[0102] Data processing:

[0103] 1. For vehicle use, a vehicle is considered fully charged when the charging cutoff voltage of 3.65V is reached, with a State of Charge (SOC) of 100%.

[0104] 2. Based on the current I, time t, and voltage U in the test data, the following relationship can be constructed:

[0105]

[0106] This allows for the construction of voltage (single cell voltage) and SOC. t(Dynamically correct the SOC correspondence)

[0107] U t =f(SOC) t ) Formula (2)

[0108] A dynamic correction table is drawn by integrating data from different currents and temperatures, which is the first dynamic correction table mentioned above. The following example, Table 1, illustrates the relationship between voltage, SOC, and temperature at different temperatures for 0.33C and 0.5C charging currents.

[0109] Table 1

[0110]

[0111] Based on the above Table 1, the first relation data can be constructed. For example, the data provided in the above Table 1 can be linearly fitted to obtain the first relation data. The first relation data is also called the first relation function. The form of the first relation data is shown in the following formula (3).

[0112] SOC 动态修正 =f(T) 模组 V 单体电压 ) Formula (3)

[0113] Among them, SOC 动态修正 To dynamically adjust SOC, T 模组 V represents the average module temperature. 单体电压 This refers to the voltage of a single cell.

[0114] 303. The vehicle terminal determines the SOC correction weight based on the charging parameters and the charging correction time of the target vehicle's battery pack.

[0115] The charging correction time of the battery pack is used to correct the remaining charging time of the battery pack, and the SOC correction weight is used to correct the current SOC.

[0116] In one possible implementation, the vehicle terminal determines a voltage correction weight based on the individual battery voltage and the average module temperature. The vehicle terminal determines a temperature correction weight based on the average module temperature. The vehicle terminal determines a polarization correction weight based on the charging correction time and the charging request current. The vehicle terminal determines a current correction weight based on the actual charging current and the charging request current. The vehicle terminal determines the SOC correction weight based on the voltage correction weight, the temperature correction weight, the polarization correction weight, and the current correction weight.

[0117] In this implementation, the vehicle terminal can determine the SOC correction weight based on the charging parameters and the charging correction time. Subsequently, the SOC can be corrected based on the SOC correction weight, thereby improving the accuracy of SOC.

[0118] To provide a clearer explanation of the above embodiments, the following description will be divided into several parts.

[0119] Part 1: The vehicle terminal determines the voltage correction weight based on the voltage of the individual battery cell and the average module temperature.

[0120] In one possible implementation, the vehicle terminal determines a corrected reference voltage based on the individual battery voltage and the average module temperature. The vehicle terminal then determines a voltage correction weight based on the individual battery voltage and the corrected reference voltage.

[0121] The correction reference voltage is used as a reference voltage when correcting the voltage of a single cell, and the voltage correction weight is used to correct the voltage of a single cell.

[0122] In this implementation, a corrected reference voltage can be determined based on the individual cell voltage and the average module temperature. A voltage correction weight can be determined based on the individual cell voltage and the corrected reference voltage. This voltage correction weight can correct the individual cell voltage. Since the state of charge (SOC) is related to the individual cell voltage, correcting the individual cell voltage can also correct the SOC.

[0123] For example, the vehicle terminal substitutes the individual battery voltage and the average module temperature into the second relational data to obtain the corrected reference voltage. This second relational data is based on a second dynamic correction table, which records the correspondence between module temperature, individual battery voltage, and the corrected reference voltage. The vehicle terminal determines the voltage correction weight based on the difference between the individual battery voltage and the corrected reference voltage.

[0124] The second dynamic correction table was also obtained through experiments. The second relationship data was obtained by linearly fitting the data in the second dynamic correction table. The correction reference voltage can be directly determined through the second relationship data, which is also called the second relationship function.

[0125] For example, the vehicle terminal substitutes the individual battery voltage and the average module temperature into the second relational data to obtain the corrected reference voltage. If the difference between the individual battery voltage and the corrected reference voltage is less than a voltage difference threshold, the vehicle terminal determines the voltage correction weight as a first voltage correction weight, which is associated with the difference between the individual battery voltage and the corrected reference voltage. If the difference between the individual battery voltage and the corrected reference voltage is greater than or equal to the voltage difference threshold, the vehicle terminal determines the voltage correction weight as a second voltage correction weight. The second voltage correction weight is a preset value, and the voltage difference threshold is set by a technician according to actual conditions, such as 2mV. This embodiment does not limit this setting.

[0126] The second relationship data is in the form of the following formula (4), and the vehicle terminal will record the single battery voltage V. 单体电压 and the average module temperature T 模组 Substituting into the following formula (4), the corrected reference voltage V is obtained. 修正参考电压 .

[0127] V 修正参考电压 = f(T) 模组 V 单体电压 ) Formula (4)

[0128] The vehicle terminal uses the following formula (5) to determine the voltage V of the single battery cell. 单体电压 and the corrected reference voltage V 修正参考电压 The difference between them determines the voltage correction weight q. 电压修正权重 .

[0129]

[0130] Part Two: The vehicle terminal determines the temperature correction weight based on the average module temperature.

[0131] In one possible implementation, the vehicle terminal determines a module reference temperature based on the average module temperature. The vehicle terminal then determines a temperature correction weight based on the difference between the average module temperature and the module reference temperature.

[0132] The module reference temperature is the reference temperature used when correcting the average module temperature, and the temperature correction weight is used to correct the average module temperature.

[0133] In this implementation, the vehicle terminal can first determine the module reference temperature based on the average module temperature, and then determine the temperature correction weight based on the difference between the average module temperature and the module reference temperature. The temperature correction weight is used to correct the average module temperature. Since temperature affects SOC, correcting the temperature can also correct the SOC.

[0134] For example, the vehicle terminal substitutes the average module temperature into the fourth relational data to obtain the module reference temperature. This fourth relational data is based on a fourth dynamic correction table, which records the average module temperature measured by the vehicle terminal and the corresponding actual module temperature, which is also the module reference temperature. If the difference between the average module temperature and the module reference temperature is less than a temperature difference threshold, the vehicle terminal determines the temperature correction weight as a first temperature correction weight, which is associated with the difference between the average module temperature and the module reference temperature. If the difference between the average module temperature and the module reference temperature is greater than or equal to the temperature difference threshold, the vehicle terminal determines the temperature correction weight as a second temperature correction weight. This second temperature correction weight is a preset value, and the temperature difference threshold is set by technicians according to actual conditions, such as 5°C. This embodiment does not limit this setting.

[0135] For example, the form of the fourth relational data can be seen in the following formula (6), and the vehicle terminal will use the average module temperature T 模组 Substituting into the following formula (6), the module reference temperature T is obtained. 模组参考温度 .

[0136] T 模组参考温度 = f(T) 模组 ) Formula (6)

[0137] The vehicle terminal uses the following formula (7) to determine the average module temperature T. 模组 and the module reference temperature T 模组参考温度 The difference between them determines the temperature correction weight q. 温度修正权重 .

[0138]

[0139] Part Three: The vehicle terminal determines the polarization correction weight based on the charging correction time and the charging request current.

[0140] In one possible implementation, the vehicle terminal substitutes the charging correction time and the charging request current into third relational data to obtain the polarization correction weight. This third relational data is obtained based on a third dynamic correction table, which records the correspondence between the charging correction time, the charging request current, and the polarization weight. When the charging request current is small and the charging correction time is long, the polarization correction weight is large; that is, the polarization correction weight is negatively correlated with the charging request current and positively correlated with the charging correction time.

[0141] In this implementation, the polarization correction weight can be obtained by directly substituting the charging correction time and the charging request current into the third relation data, and the determination efficiency of the polarization correction weight is relatively high.

[0142] For example, the vehicle terminal uses the following formula (8) to adjust the charging correction time t. 充电修正时间 and the charging request current I 请求 Determine the polarization weight q 极化权重 .

[0143] q 极化权重 =f(t) 充电修正时间 I 请求 ) Formula (8)

[0144] Part Four: The vehicle terminal determines the current correction weight based on the actual charging current and the charging request current.

[0145] In one possible implementation, the vehicle terminal determines the current correction weight based on the difference between the actual charging current and the charging request current.

[0146] In this implementation, the vehicle terminal can determine the current correction weight based on the difference between the actual charging current and the charging request current, and use the current correction weight to correct the SOC.

[0147] For example, if the difference between the actual charging current and the requested charging current is less than a current difference threshold, the vehicle terminal determines the current correction weight as a first current correction weight, which is associated with the difference between the actual charging current and the requested charging current. If the difference between the actual charging current and the requested charging current is greater than or equal to the current difference threshold, the vehicle terminal determines the current correction weight as a second current correction weight, which is a preset value. The current difference threshold is set by technicians according to the actual situation, such as 5A. This application embodiment does not limit this setting.

[0148] For example, the vehicle terminal uses the following formula (9) to calculate the actual charging current I. 实际 and the charging request current I 请求 The difference between them determines the current correction weight q. 电流修正权重 .

[0149]

[0150] Part 5: The vehicle terminal determines the SOC correction weight based on the voltage correction weight, the temperature correction weight, the polarization correction weight, and the current correction weight.

[0151] In one possible implementation, the vehicle terminal multiplies the voltage correction weight, the temperature correction weight, the polarization correction weight, and the current correction weight to obtain the SOC correction weight.

[0152] 304. The vehicle terminal determines the target SOC after correcting the current SOC based on the current SOC, the dynamically corrected SOC, and the SOC correction weight.

[0153] The target SOC is the corrected SOC, which is more accurate than the current SOC.

[0154] In one possible implementation, the vehicle terminal subtracts the dynamic SOC from the current SOC to obtain a difference SOC. The vehicle terminal multiplies the difference SOC by the SOC correction weight to obtain a target corrected SOC. The vehicle terminal adds the current SOC to the target corrected SOC to obtain the target SOC.

[0155] For example, the vehicle terminal implements the above process through the following formulas (10) and (11).

[0156] SOC 更新 =SOC 当前 +(SOC 动态修正 -SOC 当前 )×q soc修正 Formula (10)

[0157] q soc修正 =q 电流修正权重 ×q 极化修正权重 ×q 温度修正权重 ×q 电压修正权重 Formula (11)

[0158] Among them, SOC 更新 For the target SOC, q soc修正 Adjust the weights for SOC, (SOC) 动态修正 -SOC 当前 ) represents the difference SOC.

[0159] The following will combine Figure 4 The above steps 301-304 will be explained.

[0160] See Figure 4The system begins charging the target vehicle. The onboard terminal acquires charging parameters and the current State of Charge (SOC). These parameters include the individual cell voltages, average module temperature, actual charging current, and requested charging current of the target vehicle's battery pack. If the requested charging current is at a first or second current rate (e.g., 0.33C or 0.5C), the onboard terminal determines a dynamically corrected SOC based on the average module temperature and individual cell voltages. Based on these charging parameters and the charging correction time of the target vehicle's battery pack, the onboard terminal determines voltage correction weights, temperature correction weights, polarization correction weights, and current correction weights. Finally, based on these weights, the dynamically corrected SOC, and the current SOC, the onboard terminal determines the target SOC, which is the updated SOC.

[0161] It should be noted that the above steps 301-304 are illustrated using the example of a single round of SOC correction performed by the vehicle terminal. During the charging process of the target vehicle, multiple rounds of SOC correction are required. The method of each round of SOC correction belongs to the same inventive concept as the above steps 301-304, and the implementation process will not be described in detail.

[0162] 305. The vehicle terminal displays the target SOC.

[0163] The target SOC is the corrected SOC, which allows for accurate understanding of the charging progress.

[0164] The technical solution provided in this application acquires the charging parameters and current State of Charge (SOC) of a target vehicle during the charging process. These charging parameters include the individual cell voltages, average module temperature, actual charging current, and requested charging current of the target vehicle's battery pack. If the requested charging current meets the target conditions, a dynamically corrected SOC and a SOC correction weight are determined based on these charging parameters. Finally, a target SOC is determined based on the current SOC, the dynamically corrected SOC, and the SOC correction weight. This target SOC is the corrected SOC from the current SOC, and its accuracy is high.

[0165] For a corresponding method embodiment, see [link to relevant documentation]. Figure 5 This application also provides a SOC correction device 500, including: a charging parameter acquisition module 501, a dynamic correction SOC determination module 502, a SOC correction weight determination module 503, and a target SOC determination module 504.

[0166] The charging parameter acquisition module 501 is used to acquire the charging parameters and current SOC of the target vehicle during the charging process. The charging parameters include the individual cell voltage, average module temperature, actual charging current and charging request current of the target vehicle's battery pack.

[0167] The dynamic correction SOC determination module 502 is used to determine the dynamic correction SOC of the battery pack of the target vehicle based on the average module temperature and the individual cell voltage, provided that the charging request current meets the target current condition.

[0168] The SOC correction weight determination module 503 is used to determine the SOC correction weight based on the charging parameters and the charging correction time of the battery pack of the target vehicle.

[0169] The target SOC determination module 504 is used to determine the target SOC after correcting the current SOC based on the current SOC, the dynamically corrected SOC, and the SOC correction weight.

[0170] In one possible implementation, the dynamic correction SOC determination module 502 is used to substitute the average module temperature and the individual cell voltage into the first relational data to obtain the dynamic correction SOC of the battery pack of the target vehicle. The first relational data is obtained based on the first dynamic correction table, which records the correspondence between module temperature, individual cell voltage and dynamic correction SOC.

[0171] In one possible implementation, the SOC correction weight determination module 503 is configured to determine a voltage correction weight based on the individual battery voltage and the average module temperature; determine a temperature correction weight based on the average module temperature; determine a polarization correction weight based on the charging correction time and the charging request current; determine a current correction weight based on the actual charging current and the charging request current; and determine the SOC correction weight based on the voltage correction weight, the temperature correction weight, the polarization correction weight, and the current correction weight.

[0172] In one possible implementation, the SOC correction weight determination module 503 is used to determine a correction reference voltage based on the individual cell voltage and the average module temperature. The voltage correction weight is then determined based on the individual cell voltage and the correction reference voltage.

[0173] In one possible implementation, the SOC correction weight determination module 503 is used to substitute the individual cell voltage and the average module temperature into second relational data to obtain the corrected reference voltage. The second relational data is obtained based on a second dynamic correction table, which records the correspondence between module temperature, individual cell voltage, and corrected reference voltage. Determining the voltage correction weight based on the individual cell voltage and the corrected reference voltage includes: determining the voltage correction weight based on the difference between the individual cell voltage and the corrected reference voltage.

[0174] In one possible implementation, the SOC correction weight determination module 503 is used to determine a module reference temperature based on the average module temperature. The temperature correction weight is then determined based on the difference between the average module temperature and the module reference temperature.

[0175] In one possible implementation, the SOC correction weight determination module 503 is used to substitute the charging correction time and the charging request current into the third relational data to obtain the polarization correction weight. The third relational data is obtained based on a third dynamic correction table, which records the correspondence between the charging correction time, the charging request current, and the polarization weight.

[0176] In one possible implementation, the SOC correction weight determination module 503 is used to determine the current correction weight based on the difference between the actual charging current and the charging request current.

[0177] In one possible implementation, the target SOC determination module 504 is used to subtract the dynamically corrected SOC from the current SOC to obtain a difference SOC. The difference SOC is then multiplied by the SOC correction weight to obtain the target corrected SOC. Finally, the current SOC is added to the target corrected SOC to obtain the target SOC.

[0178] The technical solution provided in this application acquires the charging parameters and current State of Charge (SOC) of a target vehicle during the charging process. These charging parameters include the individual cell voltages, average module temperature, actual charging current, and requested charging current of the target vehicle's battery pack. If the requested charging current meets the target conditions, a dynamically corrected SOC and a SOC correction weight are determined based on these charging parameters. Finally, a target SOC is determined based on the current SOC, the dynamically corrected SOC, and the SOC correction weight. This target SOC is the corrected SOC from the current SOC, and its accuracy is high.

[0179] See Figure 6 This application also provides an in-vehicle terminal 600, which includes:

[0180] At least one processor; and,

[0181] The memory is communicatively connected to the at least one processor; wherein,

[0182] The memory stores instructions that may be executed by the at least one processor to enable the at least one processor to perform the SOC modification method in the foregoing method embodiments.

[0183] This application also provides a non-transitory computer-readable storage medium that stores computer instructions for causing the computer to execute the SOC correction method in the foregoing method embodiments.

[0184] This application also provides a computer program product, which includes a computing program stored on a non-transitory computer-readable storage medium. The computer program includes program instructions that, when executed by a computer, cause the computer to perform the SOC correction method in the aforementioned method embodiments.

[0185] The following is for reference. Figure 6 The diagram illustrates a structural schematic suitable for implementing the vehicle-mounted terminal 600 of the embodiments of this application. The vehicle-mounted terminal 600 in the embodiments of this application may include, but is not limited to, mobile vehicle-mounted terminals such as laptops, digital broadcast receivers, PDAs (personal digital assistants), PADs (tablet computers), PMPs (portable multimedia players), etc., as well as fixed vehicle-mounted terminals such as digital TVs, desktop computers, etc. Figure 6 The vehicle terminal 600 shown is merely an example and should not impose any limitations on the functionality and scope of application of the embodiments of this application.

[0186] like Figure 6 As shown, the vehicle terminal 600 may include a processing device (e.g., a central processing unit, a graphics processor, etc.) 601, which can perform various appropriate actions and processes according to a program stored in a read-only memory (ROM) 602 or a program loaded from a storage device 608 into a random access memory (RAM) 603. The RAM 603 also stores various programs and data required for the operation of the vehicle terminal 600. The processing device 601, ROM 602, and RAM 603 are interconnected via a bus 604. An input / output (I / O) interface 605 is also connected to the bus 604.

[0187] Typically, the following devices can be connected to I / O interface 605: input devices 606 including, for example, a touchscreen, touchpad, keyboard, mouse, image sensor, microphone, accelerometer, gyroscope, etc.; output devices 607 including, for example, a liquid crystal display (LCD), speaker, vibrator, etc.; storage devices 608 including, for example, magnetic tape, hard disk, etc.; and communication devices 609. Communication device 609 allows the vehicle terminal 600 to communicate wirelessly or wiredly with other devices to exchange data. Although a vehicle terminal 600 with various devices is shown in the figure, it should be understood that it is not required to implement or possess all of the devices shown. More or fewer devices may be implemented or possessed alternatively.

[0188] In particular, according to embodiments of this disclosure, the processes described above with reference to the flowcharts can be implemented as computer software programs. For example, embodiments of this disclosure include a computer program product comprising a computer program carried on a computer-readable medium, the computer program containing program code for performing the methods shown in the flowcharts. In such embodiments, the computer program can be downloaded and installed from a network via a communication device 609, or installed from a storage device 608, or installed from a ROM 602. When the computer program is executed by the processing device 601, it performs the functions defined in the methods of the embodiments of this application.

[0189] It should be noted that the computer-readable medium described in this disclosure can be a computer-readable signal medium or a computer-readable storage medium, or any combination thereof. A computer-readable storage medium can be, for example,—but not limited to—an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination thereof. More specific examples of a computer-readable storage medium may include, but are not limited to: an electrical connection having one or more wires, a portable computer disk, a hard disk, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage device, magnetic storage device, or any suitable combination thereof. In this disclosure, a computer-readable storage medium can be any tangible medium containing or storing a program that can be used by or in conjunction with an instruction execution system, apparatus, or device. In this disclosure, a computer-readable signal medium can include a data signal propagated in baseband or as part of a carrier wave, carrying computer-readable program code. Such propagated data signals can take various forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination thereof. A computer-readable signal medium can be any computer-readable medium other than a computer-readable storage medium, which can send, propagate, or transmit a program for use by or in connection with an instruction execution system, apparatus, or device. The program code contained on the computer-readable medium can be transmitted using any suitable medium, including but not limited to: wires, optical fibers, RF (radio frequency), etc., or any suitable combination thereof.

[0190] The aforementioned computer-readable medium may be included in the aforementioned vehicle-mounted terminal; or it may exist independently and not be installed in the vehicle-mounted terminal.

[0191] The aforementioned computer-readable medium carries one or more programs that, when executed by the vehicle-mounted terminal, cause the vehicle-mounted terminal to: acquire at least two Internet Protocol (IP) addresses; send a node evaluation request including the at least two IP addresses to a node evaluation device, wherein the node evaluation device selects an IP address from the at least two IP addresses and returns it; and receive the IP address returned by the node evaluation device; wherein the acquired IP address indicates an edge node in a content delivery network.

[0192] Alternatively, the aforementioned computer-readable medium carries one or more programs that, when executed by the vehicle-mounted terminal, cause the vehicle-mounted terminal to: receive a node evaluation request including at least two Internet Protocol (IP) addresses; select an IP address from the at least two IP addresses; and return the selected IP address; wherein the received IP address indicates an edge node in the content delivery network.

[0193] Computer program code for performing the operations of this disclosure can be written in one or more programming languages ​​or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, and C++, and conventional procedural programming languages ​​such as the "C" language or similar programming languages. The program code can be executed entirely on the user's computer, partially on the user's computer, as a standalone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving remote computers, the remote computer can be connected to the user's computer via any type of network—including a local area network (LAN) or a wide area network (WAN)—or can be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0194] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of this disclosure. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions indicated in the blocks may occur in a different order than those indicated in the drawings. For example, two consecutively indicated blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, may be implemented using a dedicated hardware-based system that performs the specified function or operation, or using a combination of dedicated hardware and computer instructions.

[0195] The units described in the embodiments of this application can be implemented in software or in hardware. The name of a unit does not necessarily limit the unit itself; for example, the first acquisition unit can also be described as "a unit that acquires at least two Internet Protocol addresses".

Claims

1. A method for correcting SOC, characterized in that, include: During the charging process of the target vehicle, the charging parameters and current SOC of the target vehicle are acquired. The charging parameters include the individual cell voltage, average module temperature, actual charging current and charging request current of the target vehicle's battery pack. If the charging request current meets the target current condition, the dynamically corrected SOC of the battery pack of the target vehicle is determined based on the average module temperature and the individual cell voltage. Based on the charging parameters and the charging correction time of the target vehicle's battery pack, the SOC correction weight is determined. Based on the current SOC, the dynamically corrected SOC, and the SOC correction weight, determine the target SOC after correcting the current SOC; The step of determining the target SOC after correcting the current SOC based on the current SOC, the dynamically corrected SOC, and the SOC correction weight includes: Subtract the dynamically corrected SOC from the current SOC to obtain the difference SOC; Multiply the difference SOC by the SOC correction weight to obtain the target corrected SOC; The current SOC is added to the target modified SOC to obtain the target SOC.

2. The SOC correction method as described in claim 1, characterized in that, The step of determining the dynamically corrected SOC of the battery pack of the target vehicle based on the average module temperature and the individual cell voltage includes: The average module temperature and the individual cell voltage are substituted into the first relational data to obtain the dynamic corrected SOC of the battery pack of the target vehicle. The first relational data is obtained based on the first dynamic correction table, which records the correspondence between module temperature, individual cell voltage and dynamic corrected SOC.

3. The SOC correction method as described in claim 1, characterized in that, The determination of the SOC correction weight based on the charging parameters and the charging correction time of the target vehicle's battery pack includes: The voltage correction weight is determined based on the individual cell voltage and the average module temperature; Based on the average module temperature, determine the temperature correction weight; The polarization correction weight is determined based on the charging correction time and the charging request current. Based on the actual charging current and the charging request current, determine the current correction weight; The SOC correction weight is determined based on the voltage correction weight, the temperature correction weight, the polarization correction weight, and the current correction weight.

4. The SOC correction method as described in claim 3, characterized in that, The determination of the voltage correction weight based on the individual cell voltage and the average module temperature includes: Based on the individual cell voltage and the average module temperature, a corrected reference voltage is determined; The voltage correction weight is determined based on the individual cell voltage and the correction reference voltage.

5. The SOC correction method as described in claim 4, characterized in that, The determination of the corrected reference voltage based on the individual cell voltage and the average module temperature includes: Substituting the individual cell voltage and the average module temperature into the second relationship data, the corrected reference voltage is obtained. The second relationship data is obtained based on the second dynamic correction table, which records the correspondence between the module temperature, the individual cell voltage, and the corrected reference voltage. The process of determining the voltage correction weight based on the individual cell voltage and the corrected reference voltage includes: The voltage correction weight is determined based on the difference between the individual cell voltage and the corrected reference voltage.

6. The SOC correction method as described in claim 3, characterized in that, The determination of the temperature correction weight based on the average module temperature includes: Based on the average module temperature, determine the module reference temperature; The temperature correction weight is determined based on the difference between the average module temperature and the module reference temperature.

7. The SOC correction method as described in claim 3, characterized in that, The determination of the polarization correction weight based on the charging correction time and the charging request current includes: The polarization correction weight is obtained by substituting the charging correction time and the charging request current into the third relational data. The third relational data is obtained based on the third dynamic correction table, which records the correspondence between the charging correction time, the charging request current, and the polarization weight.

8. The SOC correction method as described in claim 3, characterized in that, The determination of the current correction weight based on the actual charging current and the charging request current includes: The current correction weight is determined based on the difference between the actual charging current and the charging request current.

9. A SOC correction device, characterized in that, include: The charging parameter acquisition module is used to acquire the charging parameters and current SOC of the target vehicle during the charging process. The charging parameters include the individual cell voltage, average module temperature, actual charging current, and charging request current of the target vehicle's battery pack. The dynamic correction SOC determination module is used to determine the dynamic correction SOC of the battery pack of the target vehicle based on the average module temperature and the individual cell voltage, provided that the charging request current meets the target current condition. The SOC correction weight determination module is used to determine the SOC correction weight based on the charging parameters and the charging correction time of the battery pack of the target vehicle. The target SOC determination module is used to determine the target SOC after correcting the current SOC based on the current SOC, the dynamically corrected SOC, and the SOC correction weight. The step of determining the target SOC after correcting the current SOC based on the current SOC, the dynamically corrected SOC, and the SOC correction weight includes: subtracting the dynamically corrected SOC from the current SOC to obtain the difference SOC; multiplying the difference SOC by the SOC correction weight to obtain the target corrected SOC; and adding the current SOC to the target corrected SOC to obtain the target SOC.

10. A vehicle-mounted terminal, characterized in that, The vehicle-mounted terminal includes: At least one processor; and, A memory communicatively connected to the at least one processor; wherein, The memory stores instructions executable by the at least one processor, which, when executed by the at least one processor, enables the at least one processor to perform the SOC modification method according to any one of claims 1-8.

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