Charging control method and related device

Abstract

The invention provides a charging control method and a related device, and relates to the field of automobiles. In the application, after a charging instruction is responded and a reference voltage value of a power battery pack and a voltage sampling value of a high-voltage side of a charger are obtained, in order to avoid the problem that the voltage sampling value of the high-voltage side of the charger is inaccurate due to the influence of environmental factors, the reference voltage value is utilized to correct the voltage sampling value to obtain a target voltage value; the sampling voltage of the high-voltage side of the charger is matched with the reference voltage of the current power battery pack, so that the accuracy of the voltage value output by the charger is improved, the charging accuracy is improved, and the problem that charging is ended in advance due to the fact that an automobile is not fully charged due to inaccurate voltage sampling of the high-voltage side of the charger is avoided.

Description

Technical Field

[0001] The present application relates to the automotive field, and more specifically, to a charging control method and related devices. Background Art

[0002] As new energy vehicles gain more and more market share, it is increasingly important to ensure stable and reliable charging of new energy vehicles.

[0003] Currently, when charging a car, the car often stops charging before it is fully charged, and the charging reliability is low. Summary of the invention

[0004] In view of this, the present application provides a charging control method and related devices to solve the problem of stopping charging when the car is not fully charged.

[0005] In order to solve the above technical problems, this application adopts the following technical solutions:

[0006] A charging control method, comprising:

[0007] Respond to the charging instruction and obtain the reference voltage value of the power battery pack and the voltage sampling value of the high-voltage side of the charger;

[0008] Using the reference voltage value to perform a correction operation on the voltage sampling value to obtain a target voltage value;

[0009] A charging control operation is performed based on the magnitude relationship between the target voltage value and the reference voltage value.

[0010] Optionally, responding to a charging instruction includes:

[0011] If a voltage request instruction output by the battery management system and an enable charging instruction sent by the controller are received, the voltage request instruction and the enable charging instruction are responded to; the voltage request instruction includes a reference voltage value of the power battery pack; the charging instruction includes the voltage request instruction and the enable charging instruction.

[0012] Optionally, obtaining a reference voltage value of the power battery pack and a voltage sampling value of the high-voltage side of the charger includes:

[0013] Extracting a reference voltage value of the power battery pack from the voltage request instruction;

[0014] Obtaining voltage sampling data on the high-voltage side of the charger collected by the voltage sampling module inside the on-board charger;

[0015] The voltage sampling value corresponding to the voltage sampling data is calculated using the gain coefficient and the offset coefficient.

[0016] Optionally, using the reference voltage value to perform a correction operation on the voltage sampling value to obtain a target voltage value includes:

[0017] When it is determined that the voltage sampling value and the reference voltage value satisfy the correction rule, calculating the ratio of the reference voltage value to the voltage sampling value;

[0018] The voltage sampling value is corrected based on the ratio to obtain a target voltage value.

[0019] Optionally, determining that the voltage sampling value and the reference voltage value satisfy a correction rule includes:

[0020] When the value of the reference voltage value is not empty, the difference or ratio between the voltage sampling value and the reference voltage value is within a set range, and among a plurality of consecutive reference voltage values, the difference between two adjacent reference voltage values ​​is within a preset voltage range, it is determined that the voltage sampling value and the reference voltage value satisfy the correction rule.

[0021] Optionally, the voltage sampling value is corrected based on the ratio to obtain a target voltage value, including:

[0022] The product of the ratio and the voltage sampling value is used as the target voltage value.

[0023] Optionally, the target voltage value is calculated as follows:

[0024] OBC_Vout1=(AD*Slope+Offset)*Coefficient;

[0025] OBC_Vout=(AD*Slopt+Offset);

[0026]

[0027] Among them, OBC_Vout1 is the target voltage value, OBC_Vout is the voltage sampling value, AD is the value collected by the voltage sampling module, SLope is the gain coefficient, Offset is the bias coefficient, and the gain coefficient Coefficient is a ratio; BMS_Vin is the reference voltage value.

[0028] Optionally, performing a charging control operation based on a magnitude relationship between the target voltage value and the reference voltage value includes:

[0029] When the target voltage value is less than the reference voltage value, the power battery pack is charged by using the voltage outputted by the high-voltage side of the charger;

[0030] In a case where the target voltage value is not less than the reference voltage value, the charging operation is stopped.

[0031] A charging control device, comprising:

[0032] A data acquisition module is used to respond to charging instructions and obtain a reference voltage value of the power battery pack and a voltage sampling value on the high-voltage side of the charger;

[0033] A correction module, used for performing a correction operation on the voltage sampling value using the reference voltage value to obtain a target voltage value;

[0034] The charging control module is used to perform a charging control operation based on the magnitude relationship between the target voltage value and the reference voltage value.

[0035] A vehicle, comprising an on-board charger, wherein the on-board charger is connected to a power grid via an AC slow charging pile;

[0036] The on-board charger is used to charge the power battery pack using the above-mentioned charging control method.

[0037] The present application provides a charging control method and related devices. In the present application, after responding to a charging instruction and obtaining a reference voltage value of a power battery pack and a voltage sampling value on the high-voltage side of a charger, in order to avoid the problem that the voltage sampling value on the high-voltage side of the charger is inaccurate due to environmental factors, the reference voltage value is used to perform a correction operation on the voltage sampling value to obtain a target voltage value, so that the sampling voltage on the high-voltage side of the charger matches the reference voltage of the current power battery pack, thereby improving the accuracy of the voltage value output by the charger, improving the charging accuracy, and avoiding the problem that the vehicle is not fully charged and charging is terminated prematurely due to inaccurate voltage sampling on the high-voltage side of the charger. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the related technologies, the drawings required for use in the embodiments or the related technical descriptions are briefly introduced below. Obviously, the drawings described below are merely embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0039] Figure 1 A charging schematic diagram provided by an embodiment of the present invention;

[0040] Figure 2 A schematic diagram of the structure of a voltage sampling module provided by an embodiment of the present invention;

[0041] Figure 3 A flow chart of a charging control method provided by an embodiment of the present invention;

[0042] Figure 4A flow chart of a method for determining a voltage value provided by an embodiment of the present invention;

[0043] Figure 5 A flowchart of another charging control method provided by an embodiment of the present invention;

[0044] Figure 6 A schematic diagram of the structure of a charging control device provided by an embodiment of the present invention;

[0045] Figure 7 A schematic diagram of the structure of an electronic device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0046] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0047] As new energy vehicles gain more and more market share, it is becoming increasingly important to ensure stable and reliable charging of new energy vehicles.

[0048] Common AC charging methods include using a vehicle-mounted gun for AC slow charging and using an AC slow charging pile for AC slow charging. The former is reliable, but the charging current is small, resulting in a long charging time. Most users will choose the latter for charging. When using the latter for charging, the actual charging environment is relatively complex. For example, if you encounter some harsh power grids or some special environments, the charging process often ends when the car is not fully charged, resulting in premature charging termination. In addition, there are other problems such as slow charging speed.

[0049] To this end, an embodiment of the present invention provides a charging control method, and the execution subject may be a vehicle charger. In the charging control method, the problem of charging interruption and slow charging speed when the vehicle is not fully charged is analyzed, and a targeted solution is proposed.

[0050] Specifically, the charging circuit diagram for AC slow charging using an AC slow charging pile is shown in Figure 1As shown. This charging system consists of at least one of the vehicle controller and the battery management system, a power grid, an AC slow charging pile, an OBC (On-Board Charger), a power battery pack, etc. Among them, the vehicle controller and the battery management system are used to issue control instructions. When sending control instructions, at least one of the vehicle controller or the battery management system (BMS, BATTERY MANAGEMENT SYSTEM) can issue them, that is, after receiving the control instructions sent by the vehicle controller or the battery management system, the charging operation can be performed. It is also possible to receive the control instructions of the vehicle controller and the battery management system at the same time before the charging operation is performed.

[0051] The principle of slow charging of electric vehicles is:

[0052] After the AC slow charging pile is connected to the power grid, the vehicle controller and / or battery management system can issue control instructions (such as charging instructions) to control the on-board charger to charge the power battery pack. During the charging process, the on-board charger obtains AC power from the power grid through the AC slow charging pile, converts the AC power into DC power, and charges the power battery pack. If the on-board charger fails, the power battery pack will not be able to charge or will fail to charge.

[0053] In actual scenarios, the environmental conditions of the on-board chargers used by users may vary, such as high temperature, low temperature, high cold, plateau, high humidity, etc. The on-board charger is an electronic component that integrates structure, hardware, and software, and includes circuit boards, electronic components, structural parts, etc. Circuit boards and electronic components are greatly affected by environmental factors. Among them, environmental factors include internal environmental factors and external environmental factors. External environmental factors include temperature, humidity, etc., and internal environmental factors include hot and cold shocks, etc. Affected by internal environmental factors or external environmental factors, electrical gaps will appear. The electrical gap will cause the voltage value collected by the voltage sampling module inside the on-board charger to be inaccurate. For example, the sampling voltage is too large, which affects the sampling accuracy and output accuracy of the on-board charger, thereby affecting the charging control strategy of the on-board charger, resulting in problems such as charging interruption and slow charging speed due to insufficient power.

[0054] Taking high temperature and high humidity areas as an example, when electronic components work in this environment for a long time, moisture will enter the on-board charger, resulting in inaccurate voltage sampling in the OBC, which can easily lead to the above problems.

[0055] Therefore, the voltage sampling module of the on-board charger is further analyzed to analyze the cause of the above problem. The structure of the voltage sampling module used to collect the voltage value output by the on-board charger to the battery pack is as follows: Figure 2As shown, the voltage sampling module is a resistor voltage-dividing sampling circuit constructed by sampling resistors R1-R5, capacitors, control chips and other components. The sampling resistors R1-R5 will form a "water film" on the surface of the resistors when affected by moisture. The "water film" is equivalent to a resistor connected in parallel to the sampling resistor, which will cause the voltage sampling value to be too large, thereby causing the on-board charger to believe that the battery pack is fully charged and exit the charging process.

[0056] For example, the power battery pack requires a voltage of 120V, and the current output voltage of the high-voltage side of the on-board charger is about 100V. Due to the influence of temperature and humidity, the voltage value collected by the voltage sampling module is deviated, specifically 130V. Since 130V is greater than the 120V required by the power battery pack, the on-board charger believes that the power battery pack is full and charging can be terminated. However, the on-board charger actually only outputs a voltage of about 100V, which does not reach the 120V voltage required by the power battery pack. At this time, the power battery pack is not full, that is, the above-mentioned problem of charging interruption due to insufficient power occurs.

[0057] In addition, since the voltage value output by the high-voltage side of the on-board charger gradually increases, the closer it is to the voltage required by the power battery pack, the slower the rising speed. Since the detected voltage value is too large, the rising speed of the voltage value output by the on-board charger will slow down, which will lead to the problem of slow charging speed.

[0058] To this end, in an embodiment of the present invention, the voltage value of the power battery pack is used as a reference to correct the voltage sampling value on the high-voltage side of the charger, so that the voltage sampling value of the on-board charger is more accurate, thereby being able to accurately provide power to the power battery pack and avoiding the problem of charging interruption and slow charging speed due to incomplete charging.

[0059] Based on the above content, the execution subject of a charging control method in an embodiment of the present invention may be an on-board charger, that is, the on-board charger performs charging control operations on the power battery pack. Figure 3 , the charging control method in the embodiment of the present invention may include:

[0060] S11, responding to the charging instruction, obtaining the reference voltage value of the power battery pack and the voltage sampling value of the high-voltage side of the charger.

[0061] In actual scenarios, in order to improve the reliability and accuracy of charging, in the embodiment of the present invention, the vehicle controller and the battery management system are used simultaneously to perform charging control operations. The battery management system BMS is the control unit of the power battery pack. The BMS calculates the required voltage of the power battery pack by analyzing the remaining power of the battery pack and other information, and then outputs a voltage request instruction, which includes a reference voltage value of the power battery pack. The reference voltage value refers to the required voltage of the power battery pack.

[0062] In addition, a controller, such as a VCU (vehicle control unit), can also send a charging enable instruction when the power battery pack needs to be charged, wherein the charging enable instruction is an instruction that indicates that the on-board charger is allowed to charge the power battery pack. The on-board charger can only perform the charging operation after receiving the instruction.

[0063] During specific use, the on-board charger needs to receive the voltage request instruction output by the battery management system and the enable charging instruction sent by the controller at the same time before it can respond to the voltage request instruction and the enable charging instruction to charge the power battery pack. The voltage request instruction and the enable charging instruction are the charging instructions or control instructions in the embodiment of the present invention. During the charging process, the voltage value output by the on-board charger should continue to approach the required voltage of the power battery pack, that is, the reference voltage value. In actual scenarios, the reference voltage value can be variable, such as 120V at first, and then adjusted to 180V based on demand, and the on-board charger adjusts the output voltage accordingly.

[0064] When the on-board charger outputs electric energy through the high-voltage side of the charger, the voltage sampling module built into the high-voltage side is used to collect the output voltage value of the high-voltage side of the charger. This value is an AD (Analog-to-Digital, which converts electrical signals into discrete digital quantities) value, which can be called voltage sampling data. The voltage sampling value is calculated using this AD value.

[0065] Specifically, the voltage sampling value is represented by OBC_Vout, and the calculation formula of OBC_Vout is:

[0066] OBC_Vout=(AD*Slope+Offset) Wherein, AD is the value collected by the voltage sampling module, which is a digital signal, Slope is the gain coefficient, and Offset is the bias coefficient. These two coefficients are the calibration coefficients of the on-board charger when it leaves the factory.

[0067] In this embodiment, when obtaining the voltage sampling value on the high-voltage side of the charger, the voltage sampling data on the high-voltage side of the charger collected by the voltage sampling module inside the on-board charger is obtained, and the voltage sampling value corresponding to the voltage sampling data is calculated using the gain coefficient and the bias coefficient.

[0068] With respect to the reference voltage value of the power battery pack, the reference voltage value of the power battery pack can be directly extracted from the above-mentioned voltage request instruction as a reference for subsequent calculations.

[0069] It should be noted that the reference voltage value of the power battery pack is the battery voltage issued by the BMS. The signal name is "BMS_BattVolt". BMS_BattVolt is the battery pack voltage of the power battery collected by the BMS. The value of BMS_BattVolt can be the battery pack voltage BMS_Vin of the power battery collected by the on-board charger, or the actual detection value. In theory, BMS_BattVolt and BMS_Vin should be the same.

[0070] S12: using the reference voltage value to perform a correction operation on the voltage sampling value to obtain a target voltage value.

[0071] Specifically, when a water film is formed on the surface of the sampling resistor, OBC_Vout will be too large, resulting in the above-mentioned problems of charging interruption and slow charging speed due to incomplete charging. Therefore, OBC_Vout needs to be corrected.

[0072] When correcting it, since the power battery pack is less affected by environmental factors than the voltage sampling module, the reference voltage value of the power battery pack is more accurate, and the reference voltage value of the power battery pack can be used to correct the voltage sampling value collected by the voltage sampling module to obtain the target voltage value, which is closer to the actual voltage value output on the high-voltage side of the charger than the voltage sampling value.

[0073] S13. Perform a charging control operation based on the magnitude relationship between the target voltage value and the reference voltage value.

[0074] In this embodiment, if the target voltage value is less than the reference voltage value, it means that the voltage provided by the current on-board charger has not yet reached the voltage value required by the power battery pack. At this time, the charging operation will continue, and the output voltage of the high-voltage side of the charger will be used to charge the power battery pack. During the charging process, the output voltage of the high-voltage side of the charger can be continuously adjusted so that the output voltage gradually approaches the voltage required by the battery pack, that is, the reference voltage value.

[0075] If the target voltage value is not less than the reference voltage value, it means that the current on-board charger provides sufficient voltage value for the power battery pack, and it also means that the power battery pack is currently fully charged and charging can be stopped. Then the charging link can be disconnected to stop charging the vehicle.

[0076] In this embodiment, after responding to the charging instruction and obtaining the reference voltage value of the power battery pack and the voltage sampling value on the high-voltage side of the charger, in order to avoid the problem of inaccuracy caused by the voltage sampling value on the high-voltage side of the charger being affected by environmental factors, the reference voltage value is used to correct the voltage sampling value to obtain the target voltage value, so that the sampling voltage on the high-voltage side of the charger matches the reference voltage of the current power battery pack, thereby improving the accuracy of the voltage value output by the charger, improving the charging accuracy, and avoiding the problem of premature charging due to inaccurate voltage sampling on the high-voltage side of the charger causing the vehicle to be not fully charged.

[0077] In addition, since the accuracy of the sampling value of the charger output voltage is improved, the on-board charger can also charge the vehicle according to the correct control strategy, thereby improving the charging efficiency and shortening the charging time.

[0078] The above embodiment mentions that the voltage sampling value is corrected by using the reference voltage value to obtain the target voltage value. The embodiment of the present invention introduces the specific correction process. Figure 4 , which may include:

[0079] S21. When it is determined that the voltage sampling value and the reference voltage value satisfy a correction rule, calculate a ratio of the reference voltage value to the voltage sampling value.

[0080] Specifically, in order to ensure the reliability of the voltage sampling value of the on-board charger and the reference voltage value of the power battery pack, it is limited that the two voltages should be within a reasonable voltage range, such as the voltage sampling value and the reference voltage value of the power battery pack are both greater than the undervoltage protection point, and the voltage value of the undervoltage protection point can be defined, such as the reference value of 190V. In addition, the two voltages should also be less than an upper voltage limit, such as less than 500V, to ensure that the output voltage of the on-board charger and the voltage required by the battery pack are within a reasonable range to avoid abnormal charging.

[0081] In addition, in order to further improve the charging reliability, a correction rule is set, which includes a mutual verification requirement between the voltage sampling value and the reference voltage value. The charging operation is allowed only when the two meet the mutual verification requirement.

[0082] Specifically, the voltage sampling value and the reference voltage value satisfy a correction rule, including:

[0083] The value of the reference voltage value is not empty, the difference or ratio between the voltage sampling value and the reference voltage value is within a set range, and among multiple consecutive reference voltage values, the difference between two adjacent reference voltage values ​​is within a preset voltage range.

[0084] Specifically, if the reference voltage value is not empty, it means that the BMS outputs a reference voltage value with a specific value. If no specific reference voltage value is output, it means that the voltage requested by the BMS is not currently obtained. If the reference voltage value signal is lost, the charging operation cannot be performed.

[0085] The difference or ratio between the voltage sampling value and the reference voltage value is within the set range, which means that the difference between the voltage sampling value and the reference voltage value cannot be too large. In actual scenarios, although the voltage sampling value and the reference voltage value have a numerical difference due to environmental factors, the difference between the two should not be very large in theory. If it is very large, it means that the voltage sampling module in the on-board charger is abnormal or the sampling module of the power battery pack is abnormal, resulting in a large voltage difference in sampling. Taking the difference as an example, the setting range can be 5V to 40V. If it is less than 5V, it means that the voltage difference between the two is very small, and the voltage difference does not affect charging, so no correction operation can be performed. If it is greater than 40V, it means that the voltage difference between the two is very large, which is an abnormal phenomenon, indicating that a certain sampling module is abnormal. At this time, in order to improve charging reliability, the charging operation can be stopped. Only when the difference is within 5V to 40V, it can be considered that the voltage sampling value and the reference voltage have deviations and the deviations are within a reasonable range. Taking the ratio as an example, the preset range can be 0.8 to 1.0. Taking 0.8 as an example, if the reference voltage value < 0.8 times the voltage sampling value or the reference voltage value > 0.8 times the voltage sampling value, it means that the difference between the two is too large and there is an abnormality in the sampling module. No correction or calibration is performed. At this time, an abnormal prompt message can be output to determine whether to stop the charging operation.

[0086] In addition, the BMS can periodically send voltage request instructions, and will receive multiple continuous reference voltage values. In this embodiment, the difference between two adjacent reference voltage values ​​in the continuous multiple reference voltage values ​​is set to be within the preset voltage range in order to determine whether the required voltage of the power battery pack is stable. In theory, the required voltage of the power battery pack should vary less, so the preset voltage range can be set to 3V. If the difference between the previous and next reference voltage values ​​exceeds 3V in the reference voltage values ​​of 50 consecutive frames (500ms), it means that the voltage fluctuation range of the current power battery pack is large, and no correction operation is performed.

[0087] When the value of the reference voltage value is not empty, the difference or ratio between the voltage sampling value and the reference voltage value is within the set range, and the difference between two adjacent reference voltage values ​​among the continuous multiple reference voltage values ​​is within the preset voltage range, it is determined that the voltage sampling value and the reference voltage value meet the correction rule and the correction operation can be performed. At this time, the ratio of the reference voltage value to the voltage sampling value can be calculated. The ratio can be expressed by the gain coefficient Coefficient. Then:

[0088]

[0089] Among them, BMS_Vin is the battery pack voltage of the power battery collected by the on-board charger, which is used to represent BMS_BattVolt. OBC_Vout is the voltage sampling value of the high-voltage side output voltage of the charger collected by the voltage sampling module, AD is the value collected by the voltage sampling module, which is a digital signal, Slope is the gain coefficient, and Offset is the offset coefficient.

[0090] S22. Correct the voltage sampling value based on the ratio to obtain a target voltage value.

[0091] Since the gain coefficient Coefficient is the ratio of the reference voltage value to the voltage sampling value, the difference between the two voltage values ​​can be guaranteed, and the voltage sampling value can be corrected by using the difference subsequently.

[0092] In this embodiment, the product of the ratio and the voltage sampling value can be directly used as the target voltage value. That is:

[0093] OBC_Vout1=(AD*Slope+Offset)*Coefficient

[0094] Among them, OBC_Vout1 is the target voltage value, AD is the value collected by the voltage sampling module, which is a digital signal, Slope is the gain coefficient, Offset is the bias coefficient, and Coefficient is the gain coefficient.

[0095] For example, if the ratio is 0.9, it means that the reference voltage value is 0.9 times the voltage sampling value, which means that 0.9 times the voltage sampling value is the actual high-voltage side output value.

[0096] From the above, it can be seen that the calculation formula of the target voltage value is:

[0097] OBC_Vout1=(AD*Slope+Offset)*Coefficient;

[0098] OBC_Vout=(AD*Slopt+Offset);

[0099]

[0100] Among them, OBC_Vout1 is the target voltage value, OBC_Vout is the voltage sampling value, AD is the value collected by the voltage sampling module, Slope is the gain coefficient, Offset is the bias coefficient, and the gain coefficient Coefficient is a ratio; BMS_Vin is the reference voltage value.

[0101] After obtaining the target voltage value, when the target voltage value is less than the reference voltage value, the high voltage side output voltage of the charger can be used to charge the power battery pack. When the target voltage value is not less than the reference voltage value, the charging operation is stopped. For the specific implementation process, refer to the corresponding description above.

[0102] In order for those skilled in the art to understand the present invention more clearly, Figure 5 Provide an explanation of the overall plan.

[0103] After the on-board charger OBC is connected to the vehicle's power battery pack, it can be put into working state. At this time, OBC can receive the voltage request instruction including the reference voltage value of the power battery pack sent by BMS, and can also receive the enable charging instruction of the controller, such as VCU. After both instructions are successfully received, the charging operation begins. At this time, the output voltage on the high-voltage side is collected through the built-in voltage sampling module to obtain the voltage sampling value, which is compared with the reference voltage value sent by BMS. If the voltage sampling value is less than the BMS requested voltage value, that is, the above-mentioned reference voltage value, charging continues. During the charging process, it is continuously judged whether the voltage sampling value is less than the BMS requested voltage value, and the corresponding operation is performed until the charging is completed. If the voltage sampling value is ≥ the BMS requested voltage value, that is, the above-mentioned reference voltage value, it means that the voltage output by the on-board charger at this time meets the voltage requirement of the power battery pack, which means that the power battery pack is fully charged and the charging operation can be stopped.

[0104] In this embodiment, when the on-board charger is charging the power battery pack, corresponding correction rules are set for the voltage sampling value and the reference voltage value to ensure that the two voltage values ​​are within a reasonable numerical range in terms of data stability and validity, thereby improving the reliability of subsequent corrections.

[0105] In addition, the present invention uses the reference voltage value of the power battery pack to correct the voltage sampling value inside the on-board charger, thereby ensuring the reliability and stability of the voltage sampling value of the on-board charger, being able to adapt to different environments more and avoiding the influence of environmental factors on voltage sampling.

[0106] Based on the above embodiment of the charging control method, another embodiment of the present invention provides a charging control device, referring to Figure 6 , which may include:

[0107] The data acquisition module 11 is used to respond to the charging instruction and obtain the reference voltage value of the power battery pack and the voltage sampling value of the high-voltage side of the charger;

[0108] A correction module 12, configured to perform a correction operation on the voltage sampling value using the reference voltage value to obtain a target voltage value;

[0109] The charging control module 13 is used to perform a charging control operation based on the magnitude relationship between the target voltage value and the reference voltage value.

[0110] In one implementation, the data acquisition module 11 includes:

[0111] A response submodule is used to respond to the voltage request instruction output by the battery management system and the enable charging instruction sent by the controller if the voltage request instruction is received; the voltage request instruction includes a reference voltage value of the power battery pack; the charging instruction includes the voltage request instruction and the enable charging instruction.

[0112] In one implementation, the data acquisition module 11 includes:

[0113] A first acquisition submodule, used to extract a reference voltage value of the power battery pack from the voltage request instruction;

[0114] The second acquisition submodule is used to obtain the voltage sampling data of the high-voltage side of the charger collected by the voltage sampling module inside the on-board charger, and calculate the voltage sampling value corresponding to the voltage sampling data using the gain coefficient and the bias coefficient.

[0115] In one implementation, the correction module 12 includes:

[0116] a ratio calculation submodule, for calculating a ratio of the reference voltage value to the voltage sampling value when it is determined that the voltage sampling value and the reference voltage value satisfy a correction rule;

[0117] The correction submodule is used to correct the voltage sampling value based on the ratio to obtain a target voltage value.

[0118] In one implementation, the ratio calculation submodule includes:

[0119] A rule judgment unit is used to determine that the voltage sampling value and the reference voltage value meet the correction rule when the value of the reference voltage value is not empty, the difference or ratio between the voltage sampling value and the reference voltage value is within a set range, and the difference between two adjacent reference voltage values ​​among a plurality of consecutive reference voltage values ​​is within a preset voltage range.

[0120] In one implementation, the correction submodule is specifically used for:

[0121] The product of the ratio and the voltage sampling value is used as the target voltage value.

[0122] In one implementation, the target voltage value is calculated as follows:

[0123] OBC_Vout1=(AD*Slope+Offset)*Coefficient;

[0124] OBC_Vout=(AD*Slope+Offset);

[0125]

[0126] Among them, OBC_Vout1 is the target voltage value, OBC_Vout is the voltage sampling value, AD is the value collected by the voltage sampling module, Slope is the gain coefficient, Offset is the bias coefficient, and the gain coefficient Coeffcient is used as a ratio; BMS_Vin is the reference voltage value.

[0127] In one implementation, the charging control module 13 includes:

[0128] A first control submodule, configured to use the high-voltage side output voltage of the charger to charge the power battery pack when the target voltage value is less than the reference voltage value;

[0129] The second control submodule is used to stop the charging operation when the target voltage value is not less than the reference voltage value.

[0130] In this embodiment, after responding to the charging instruction and obtaining the reference voltage value of the power battery pack and the voltage sampling value on the high-voltage side of the charger, in order to avoid the problem of inaccuracy caused by the voltage sampling value on the high-voltage side of the charger being affected by environmental factors, the reference voltage value is used to correct the voltage sampling value to obtain the target voltage value, so that the sampling voltage on the high-voltage side of the charger matches the reference voltage of the current power battery pack, thereby improving the accuracy of the voltage value output by the charger, improving the charging accuracy, and avoiding the problem of premature charging due to inaccurate voltage sampling on the high-voltage side of the charger causing the vehicle to be not fully charged.

[0131] It should be noted that, for the working process of each module and sub-module in this embodiment, please refer to the corresponding description in the above embodiment, which will not be repeated here.

[0132] An embodiment of the present application also provides an electronic device, including at least one processor and a memory connected to the processor, wherein:

[0133] The memory is used to store computer programs;

[0134] The processor is used to execute the computer program so that the electronic device can implement the above-mentioned charging control method, so as to charge the power battery pack using the charging control method.

[0135] refer to Figure 7As shown, it shows a schematic diagram of the structure of an electronic device suitable for implementing the embodiment of the present application. The electronic device in the embodiment of the present application may include but is not limited to fixed terminals such as a vehicle charger, a mobile phone, a notebook computer, a PDA (personal digital assistant), a PAD (tablet computer), a desktop computer, etc. Figure 7 The electronic device shown is merely an example and should not bring any limitation to the functions and scope of use of the embodiments of the present application.

[0136] like Figure 7 As shown, the electronic device may include a processing device (e.g., a central processing unit, a graphics processing unit, 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. When the electronic device is powered on, various programs and data required for the operation of the electronic device are also stored in the RAM 603. The processing device 601, the ROM 602, and the RAM 603 are connected to each other via a bus 604. An input / output (I / O) interface 605 is also connected to the bus 604.

[0137] Typically, the following devices may be connected to the I / O interface 605: an input device 606 including, for example, a touch screen, a touch pad, a keyboard, a mouse, a camera, a microphone, an accelerometer, a gyroscope, etc.; an output device 607 including, for example, a liquid crystal display (LCD), a speaker, a vibrator, etc.; a storage device 608 including, for example, a memory card, a hard disk, etc.; and a communication device 609. The communication device 609 may allow the electronic device to communicate with other devices wirelessly or by wire to exchange data. Although Figure 7 An electronic device having various devices is shown, but it should be understood that it is not required to implement or possess all the devices shown. More or fewer devices may be implemented or possessed instead.

[0138] The present application also provides a vehicle, including an on-board charger, which is connected to the power grid via an AC slow charging pile. The specific connection structure is as follows: Figure 1 described.

[0139] The on-board charger is used to charge the power battery pack using the above-mentioned charging control method.

[0140] An embodiment of the present application also provides a computer program product including computer-readable instructions. When the computer-readable instructions are executed on an electronic device, the electronic device implements any charging control method provided in the embodiment of the present application.

[0141] A computer-readable storage medium is also provided in an embodiment of the present application. The storage medium carries one or more computer programs. When the one or more computer programs are executed by an electronic device, the electronic device can implement any charging control method provided in the embodiment of the present application.

[0142] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A charging control method, characterized in that: include: Respond to the charging instruction and obtain the reference voltage value of the power battery pack and the voltage sampling value of the high-voltage side of the charger; Using the reference voltage value to perform a correction operation on the voltage sampling value to obtain a target voltage value; A charging control operation is performed based on the magnitude relationship between the target voltage value and the reference voltage value.

2. The charging control method according to claim 1, characterized in that: Respond to charging instructions, including: If a voltage request instruction output by the battery management system and a charging enable instruction sent by the controller are received, the voltage request instruction and the charging enable instruction are responded to; the voltage request instruction includes a reference voltage value of the power battery pack; the charging instruction includes the voltage request instruction and the charging enable instruction.

3. The charging control method according to claim 2, characterized in that: Obtain the reference voltage value of the power battery pack and the voltage sampling value of the high-voltage side of the charger, including: Extracting a reference voltage value of the power battery pack from the voltage request instruction; Obtaining voltage sampling data on the high-voltage side of the charger collected by the voltage sampling module inside the on-board charger; The voltage sampling value corresponding to the voltage sampling data is calculated using the gain coefficient and the offset coefficient.

4. The charging control method according to claim 1, characterized in that: The voltage sampling value is corrected by using the reference voltage value to obtain a target voltage value, including: When it is determined that the voltage sampling value and the reference voltage value satisfy the correction rule, calculating the ratio of the reference voltage value to the voltage sampling value; The voltage sampling value is corrected based on the ratio to obtain a target voltage value.

5. The charging control method according to claim 4, characterized in that: Determining that the voltage sampling value and the reference voltage value satisfy a correction rule includes: When the value of the reference voltage value is not empty, the difference or ratio between the voltage sampling value and the reference voltage value is within a set range, and among a plurality of consecutive reference voltage values, the difference between two adjacent reference voltage values ​​is within a preset voltage range, it is determined that the voltage sampling value and the reference voltage value satisfy the correction rule.

6. The charging control method according to claim 4, characterized in that: Correcting the voltage sampling value based on the ratio to obtain a target voltage value includes: The product of the ratio and the voltage sampling value is used as the target voltage value.

7. The charging control method according to claim 6, characterized in that: The target voltage value is calculated as follows: OBC_Vout1=(AD*Slope+Offset)*Coefficient; OBC_Vout=(AD*Slope+Offset); Among them, OBC_Vout1 is the target voltage value, OBC_Vout is the voltage sampling value, AD is the value collected by the voltage sampling module, Slope is the gain coefficient, Offset is the bias coefficient, and the gain coefficient Coefficient is a ratio; BMS_Vin is the reference voltage value.

8. The charging control method according to claim 1, characterized in that: Based on the magnitude relationship between the target voltage value and the reference voltage value, a charging control operation is performed, including: When the target voltage value is less than the reference voltage value, the power battery pack is charged by using the voltage outputted by the high-voltage side of the charger; In a case where the target voltage value is not less than the reference voltage value, the charging operation is stopped.

9. A charging control device, characterized in that: include: A data acquisition module is used to respond to charging instructions and obtain a reference voltage value of the power battery pack and a voltage sampling value on the high-voltage side of the charger; A correction module, used for performing a correction operation on the voltage sampling value using the reference voltage value to obtain a target voltage value; The charging control module is used to perform a charging control operation based on the magnitude relationship between the target voltage value and the reference voltage value.

10. A vehicle, characterized in that: It includes an on-board charger, which is connected to the power grid via an AC slow charging pile; The on-board charger is used to charge the power battery pack using the charging control method according to any one of claims 1 to 7.

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