Charging control method and system for electric vehicle

Abstract

A charging control method and system for an electric vehicle, relating to the technical field of intelligent vehicles. The method comprises: receiving a first charging cut-off SOC (S1); on the basis of the first charging cut-off SOC, acquiring indication information, the indication information indicating whether the first charging cut-off SOC is valid (S2); on the basis of the first charging cut-off SOC, the indication information, and a charging threshold, acquiring a second charging cut-off SOC (S3); comparing the second charging cut-off SOC and the SOC of a battery in the process of charging the battery by means of a whole-vehicle controller, and, on the basis of a comparison result, controlling a charging operation performed by the whole-vehicle controller on the battery (S4); when the whole-vehicle controller stops charging the battery, controlling the battery to enter a continuous discharging state; and determining whether the battery satisfies a recharging condition after discharging, and if the battery satisfies the recharging condition after discharging, charging the battery by means of the whole-vehicle controller (S5).

Description

Charging control method and system of electric vehicle

[0001] The present application claims priority to the Chinese patent application No. 202411108587.8, filed on August 13, 2024, and entitled "Charging control method and system of electric vehicle", the whole content of which is incorporated herein by reference. TECHNICAL FIELD

[0002] The present application belongs to the technical field of intelligent vehicles, and relates to a charging control method and system of electric vehicle. BACKGROUND

[0003] With the change of the times, electric vehicles gradually approach the public's vision. Electric vehicles will become the mainstream of future transportation tools due to their advantages of cleanliness, environmental protection and low noise. At the same time, the battery storage of electric vehicles has become the focus of discussion. Therefore, when driving electric vehicles, how to manage the charging of electric vehicles and improve the battery life has become an important research topic. The state of charge (SOC) is an important parameter to represent the remaining power of the battery pack. Whether the SOC estimation is accurate directly affects the performance of electric tools. SUMMARY

[0004] The purpose of the present application is to solve the problem that the SOC displayed by the instrument drops quickly, and the electric vehicle frequently prompts to charge, without displaying the actual power. The present application provides a charging control method and system of electric vehicle.

[0005] To achieve the above purpose, the present application adopts the following technical solutions:

[0006] The charging control method of electric vehicle proposed by the present application is executed by a vehicle, which includes a vehicle controller and a battery. The method comprises:

[0007] Receiving a first charging cutoff SOC, which is the SOC of the battery at the time of charging cutoff, set by the instrument;

[0008] Based on the first charging cutoff SOC, obtaining indication information indicating whether the first charging cutoff SOC is valid;

[0009] Based on the first charging cutoff SOC, the indication information and the charging threshold, obtaining a second charging cutoff SOC, which is the SOC of the battery at the time of charging cutoff, used by the vehicle controller;

[0010] In the process of charging the battery by the vehicle controller, the second charge cut-off SOC is compared with the SOC of the battery, and based on the comparison result, the charging operation of the vehicle controller to the battery is controlled;

[0011] When the vehicle controller stops charging the battery, the battery is controlled to enter a continuous discharge state; it is judged whether the battery meets the recharging condition after discharging, and if so, the battery is charged by the vehicle controller.

[0012] Preferably, the second charge cut-off SOC is obtained based on the first charge cut-off SOC, the indication information and a charging threshold, comprising:

[0013] If the indication information indicates that the first charge cut-off SOC is invalid, the second charge cut-off SOC under the condition that the first charge cut-off SOC is invalid is obtained; or,

[0014] If the indication information indicates that the first charge cut-off SOC is valid, it is judged whether the first charge cut-off SOC is greater than the charging threshold; if the first charge cut-off SOC is less than the charging threshold, the second charge cut-off SOC under the condition that the first charge cut-off SOC is less than the charging threshold is obtained; if the first charge cut-off SOC is greater than the charging threshold, the second charge cut-off SOC under the condition that the first charge cut-off SOC is greater than the charging threshold is obtained based on the first charge cut-off SOC.

[0015] Preferably, the indication information includes first indication information and second indication information, the first indication information indicates that the first charge cut-off SOC is invalid, and the second indication information indicates that the first charge cut-off SOC is valid; the indication information is obtained based on the first charge cut-off SOC, comprising:

[0016] If the signal of the first charge cut-off SOC is 0x0:Not_Active, 0xFE:Abnormal or 0xFF:Invalid, the first indication information is obtained;

[0017] If the indication information indicates that the first charge cut-off SOC is invalid, the second charge cut-off SOC under the condition that the first charge cut-off SOC is invalid is obtained, comprising:

[0018] If the first indication information is obtained, a memory value is determined as the second charge cut-off SOC, and the memory value is the charge cut-off SOC received by the vehicle controller in the previous ignition cycle.

[0019] Preferably, if the first charge cut-off SOC is less than the charge threshold, obtaining the second charge cut-off SOC under the condition that the first charge cut-off SOC is less than the charge threshold comprises:

[0020] If the first charge cut-off SOC is less than the charge threshold, determining a default value or a memory value as the second charge cut-off SOC; the default value is the charge cut-off SOC set when the vehicle is manufactured, and the memory value is the charge cut-off SOC received by the vehicle controller in the previous ignition cycle.

[0021] Preferably, the second charge cut-off SOC under the condition that the first charge cut-off SOC is greater than the charge threshold comprises:

[0022] When the first charge cut-off SOC is less than 99, the sum of the first charge cut-off SOC and 0.9 is determined as the second charge cut-off SOC;

[0023] When the first charge cut-off SOC is 99, the sum of the first charge cut-off SOC and 0.4 is determined as the second charge cut-off SOC;

[0024] When the first charge cut-off SOC is 100, the first charge cut-off SOC is determined as the second charge cut-off SOC.

[0025] Preferably, the control of the charging operation of the vehicle controller on the battery based on the comparison result comprises:

[0026] When the second charge cut-off SOC is greater than the SOC of the battery, the vehicle controller continues to charge the battery; or,

[0027] When the second charge cut-off SOC is not greater than the SOC of the battery, the vehicle controller stops charging the battery.

[0028] Preferably, the judgment of whether the battery satisfies the recharging condition after discharging comprises:

[0029] If the charging gun is not unplugged and the vehicle controller is not in sleep mode, when the SOC of the battery is not greater than the difference between the first charge cut-off SOC and 0.9, the vehicle controller judges whether the battery satisfies the recharging condition; when the SOC of the battery is greater than the difference between the first charge cut-off SOC and 0.9, the vehicle controller does not respond to the charging request.

[0030] If the charging gun is re-plugged or the vehicle controller is hibernated and then woken up, when the SOC of the battery is less than the first charging cut-off SOC, the vehicle controller is used to determine whether the battery meets the re-charging condition.

[0031] Preferably, the vehicle controller is used to determine whether the battery meets the re-charging condition, including:

[0032] Based on the first charging cut-off SOC, the indication information is obtained.

[0033] Based on the first charging cut-off SOC, the indication information and the charging threshold, the second charging cut-off SOC is obtained.

[0034] The second charging cut-off SOC is compared with the SOC of the battery, and based on the comparison result, the charging operation of the vehicle controller on the battery is controlled.

[0035] The application provides an electric vehicle charging control system, including:

[0036] An information receiving module is used to receive a first charging cut-off SOC, the first charging cut-off SOC being a SOC set by an instrument when the battery is charged and cut off;

[0037] A first judging module is used to obtain indication information based on the first charging cut-off SOC, the indication information indicating whether the first charging cut-off SOC is valid; based on the first charging cut-off SOC, the indication information and a charging threshold, a second charging cut-off SOC is obtained, the second charging cut-off SOC being a SOC used by the vehicle controller and when the battery is charged and cut off;

[0038] A second judging module is used to compare the second charging cut-off SOC with the SOC of the battery during the charging process of the battery by the vehicle controller, and based on the comparison result, the charging operation of the vehicle controller on the battery is controlled.

[0039] A third judging module is used to control the battery to enter a continuous discharging state after the vehicle controller stops charging the battery; whether the battery meets a re-charging condition after discharging is determined, and if yes, the battery is charged by the vehicle controller.

[0040] A terminal device includes a memory, a processor and a computer program stored in the memory and executable on the processor, and the processor implements the steps of the electric vehicle charging control method when executing the computer program.

[0041] The application provides a charging control method of an electric vehicle, which realizes accurate control of battery charging by setting a charging cut-off SOC through an instrument and performing a series of judgments and comparisons, avoids overcharging or undercharging, prolongs the service life of the battery, effectively judges the charging cut-off SOC and the relationship with the charging threshold, stops charging at a suitable time, avoids unnecessary energy waste, and improves charging efficiency; the charging cut-off SOC corresponding to the vehicle controller is obtained according to different situations, and compared with the actual SOC of the battery, which helps to fully utilize the capacity of the battery and optimize the performance of the battery. The scheme effectively avoids the charging cycle of repeatedly entering charging / charging end due to the rapid power failure of the instrument, is easy to implement, does not require complex program design, can effectively improve the service life and health of the battery, makes the charging safer, and can reduce the cost of using the vehicle, ensure the stability of the electric vehicle, and enhance the driving experience and safety of the electric vehicle. BRIEF DESCRIPTION OF DRAWINGS

[0042] In order to more clearly illustrate the technical solutions of the embodiments of the application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the application, and therefore should not be regarded as a limitation to the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0043] Fig. 1 is a flowchart of the charging control method of the electric vehicle of the application.

[0044] Fig. 2 is a structural schematic diagram of the charging control system of the electric vehicle of the application.

[0045] Fig. 3 is a structural schematic diagram of an electronic device of the application. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical solutions and advantages of the embodiments of the application more clear, the following will combine the drawings in the embodiments of the application to clearly and completely describe the technical solutions in the embodiments of the application. Obviously, the described embodiments are some of the embodiments of the application, but not all the embodiments. The components of the embodiments of the application described and shown in the drawings can be arranged and designed in various different configurations.

[0047] Therefore, the following detailed description of the embodiments of the application provided in the drawings is not intended to limit the scope of the claimed application, but only represents selected embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of the protection of the application.

[0048] It should be noted that similar reference numerals and letters refer to similar items throughout the accompanying drawings, and therefore, once an item is defined in one drawing, it is not necessary to further define and explain it in subsequent drawings.

[0049] In the description of the embodiments of the present application, it should be noted that if the terms such as "upper", "lower", "horizontal", "inner" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the present application is usually placed, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", and the like are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0050] In addition, if the term "horizontal" appears, it does not mean that the component must be absolutely horizontal, but can be slightly inclined. For example, "horizontal" only means that its direction is relatively more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0051] In the description of the embodiments of the present application, it should also be noted that unless otherwise explicitly specified and limited, if the terms "arrangement", "installation", "connection", "connection" appear, they should be understood in a broad sense. For example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0052] The existing electric vehicle stops charging when the charging reaches the set cut-off SOC, but the instrument shows that the SOC drops quickly, and the electric vehicle frequently charges, affecting the customer charging experience.

[0053] The present application will be described in further detail below with reference to the accompanying drawings:

[0054] The present application proposes a charging control method for an electric vehicle, as shown in FIG. 1, the method is executed by a vehicle, the vehicle includes a vehicle controller and a battery, and the method includes:

[0055] S1, receiving a first charging cut-off SOC, the first charging cut-off SOC is the SOC of the battery when the charging is cut off, which is set based on the instrument.

[0056] In the embodiment of the present application, the user can set the SOC at which the battery charging is stopped through the instrument on the car, that is, set how much the battery charging stops when the battery charging reaches. The first charging cutoff SOC corresponds to the amount of electricity at which the user sets the battery charging to stop through the car instrument, that is, when the battery is subsequently charged, if the amount of electricity of the battery reaches the first charging cutoff SOC, the charging of the battery will be stopped. The above step S1 corresponds to receiving the instruction information based on the charging cutoff SOC set by the instrument.

[0057] S2, based on the first charging cutoff SOC, obtain indication information indicating whether the first charging cutoff SOC is valid.

[0058] S3, based on the first charging cutoff SOC, the indication information and the charging threshold, obtain the second charging cutoff SOC, the second charging cutoff SOC is the SOC at which the battery charging is stopped for the vehicle controller.

[0059] In the embodiment of the present application, after the car receives the first charging cutoff SOC set by the user through the instrument, it needs to judge whether the first charging cutoff SOC is valid, and also considers the size relationship between the first charging cutoff SOC and the charging threshold. Whether the first charging cutoff SOC is valid and the size relationship between the first charging cutoff SOC and the charging threshold will determine different second charging cutoff SOCs. Among them, the second charging cutoff SOC is the charging cutoff SOC used by the vehicle controller, and when the battery is subsequently charged by the vehicle controller, it will be based on the second charging cutoff SOC to judge whether to continue charging the battery or stop charging the battery. The charging threshold is any value, for example, the charging threshold is 80, that is, 80% of the battery capacity. And when charging the battery of the car, the user needs to insert the charging gun into the charging port of the car, and then the car controls how to charge the battery through the vehicle controller in the car under the condition that the charging gun has been inserted. For example, the vehicle controller can control when to ensure the charging circuit of the battery to be on, so that the battery can be charged under the condition that the charging circuit is on; the vehicle controller can also control when to make the charging circuit of the battery to be off, so that the charging of the battery can be stopped under the condition that the charging circuit is off; the vehicle controller can also detect the SOC of the battery in real time to determine the current amount of electricity of the battery.

[0060] In the embodiment of the present application, the above steps S2 and S3 correspond to judging whether the instruction information of the charging cutoff SOC is valid and the relationship with the charging threshold based on the instruction information of the set charging cutoff SOC, and obtaining the vehicle controller charging cutoff SOC under different conditions.

[0061] In some embodiments, the instruction information of the charging cut-off SOC is judged to be valid or not and the relationship with the charging threshold value, specifically: if the instruction information of the set charging cut-off SOC is judged to be invalid, the charging cut-off SOC of the vehicle controller in the case of invalid charging cut-off SOC is obtained; if it is valid, it is further judged whether the charging cut-off SOC is greater than the charging threshold value; if it is less than, the charging cut-off SOC of the vehicle controller in the case of charging cut-off SOC less than the charging threshold value is obtained; if it is greater than, the charging cut-off SOC of the vehicle controller in the case of charging cut-off SOC greater than the charging threshold value is obtained according to the set charging cut-off SOC. That is, based on the first charging cut-off SOC, the instruction information and the charging threshold value, the second charging cut-off SOC is obtained, including: if the instruction information indicates that the first charging cut-off SOC is invalid, the second charging cut-off SOC in the case of invalid first charging cut-off SOC is obtained; or, if the instruction information indicates that the first charging cut-off SOC is valid, it is judged whether the first charging cut-off SOC is greater than the charging threshold value; if the first charging cut-off SOC is less than the charging threshold value, the second charging cut-off SOC in the case of first charging cut-off SOC less than the charging threshold value is obtained; if the first charging cut-off SOC is greater than the charging threshold value, the second charging cut-off SOC in the case of first charging cut-off SOC greater than the charging threshold value is obtained based on the first charging cut-off SOC.

[0062] In the embodiments of the present application, in the case of invalid first charging cut-off SOC, it is not necessary to judge the size relationship between the first charging cut-off SOC and the charging threshold value, and the second charging cut-off SOC in the invalid case can be directly obtained; in the case of valid first charging cut-off SOC, it is necessary to judge the size relationship between the first charging cut-off SOC and the charging threshold value, and different second charging cut-off SOCs are obtained according to the size relationship, so that the strategies for obtaining the corresponding charging cut-off SOC of the vehicle controller are set for various different cases, to ensure that the finally obtained charging cut-off SOC matches the current situation of the automobile, to ensure the accuracy of the obtained charging cut-off SOC, so as to realize accurate control of battery charging subsequently.

[0063] Optionally, if it is judged that the instruction information of the set charging cut-off SOC is invalid, the charging cut-off SOC of the vehicle controller in the case of invalid charging cut-off SOC is obtained, specifically: if the signal of the charging cut-off SOC is 0x0:Not_Active or 0xFE:Abnormal or 0xFF:Invalid, it is considered that the charging cut-off SOC is invalid, and it is determined that the value of the charging cut-off SOC of the vehicle controller in the current case is equal to the memory value, and the memory value is the power-off storage value received by the vehicle controller in the previous ignition cycle, ranging from 80 to 100. That is, the instruction information includes first instruction information and second instruction information, the first instruction information indicates that the first charging cut-off SOC is invalid, and the second instruction information indicates that the first charging cut-off SOC is valid; based on the first charging cut-off SOC, the instruction information is obtained, including: if the signal of the first charging cut-off SOC is 0x0:Not_Active, 0xFE:Abnormal or 0xFF:Invalid, the first instruction information is obtained; if the instruction information indicates that the first charging cut-off SOC is invalid, the second charging cut-off SOC in the case of invalid first charging cut-off SOC is obtained, including: if the first instruction information is obtained, the memory value is determined as the second charging cut-off SOC, and the memory value is the charging cut-off SOC received by the vehicle controller in the previous ignition cycle.

[0064] In the embodiment of the application, after the user sets the first charging cut-off SOC through the instrument of the automobile, if the first charging cut-off SOC received by the automobile is 0x0:Not_Active, 0xFE:Abnormal or 0xFF:Invalid, it indicates that the first charging cut-off SOC set by the user through the instrument is invalid, and in the case of invalid first charging cut-off SOC, the charging cut-off SOC used by the vehicle controller in the previous ignition cycle is taken as the charging cut-off SOC in the current cycle, which ensures that the vehicle controller can accurately control the charging process of the battery in the subsequent period, and at the same time, ensures that the power of the battery when stopping charging can reach the satisfaction of the user, thereby ensuring the user experience.

[0065] Optionally, the charging cut-off SOC of the vehicle controller in the case of charging cut-off SOC less than the charging threshold is obtained, specifically: when the value of the charging cut-off SOC satisfies 0<charging cut-off SOC<80, the value of the charging cut-off SOC of the vehicle controller in the current case is a default value or a memory value; the default value is 100, which is the value set when the vehicle is manufactured. That is, if the first charging cut-off SOC is less than the charging threshold, the second charging cut-off SOC in the case of first charging cut-off SOC less than the charging threshold is obtained, including: if the first charging cut-off SOC is less than the charging threshold, the default value or the memory value is determined as the second charging cut-off SOC; the default value is the charging cut-off SOC set when the automobile is manufactured, and the memory value is the charging cut-off SOC received by the vehicle controller in the previous ignition cycle.

[0066] In the embodiment of the present application, the charging threshold corresponds to the minimum amount of electricity required to be reached when charging the battery. In the case where the first charging cut-off SOC is valid, the size relationship between the first charging cut-off SOC and the charging threshold needs to be considered. If the first charging cut-off SOC is less than the charging threshold, it means that the charging cut-off SOC set by the user is less than the minimum amount of electricity required to be reached when charging the battery. If the battery is charged according to the first charging cut-off SOC, the situation of frequent charging due to the low amount of electricity of the battery will occur. Therefore, the default value or the memory value is taken as the second charging cut-off SOC, so that the vehicle controller controls the process of charging the battery according to the default value or the memory value in the subsequent process, which can realize accurate control of the battery charging, avoid overcharging or insufficient charging, and thus prolong the service life of the battery.

[0067] Alternatively, according to the set charging cut-off SOC, the vehicle controller charging cut-off SOC in the case where the charging cut-off SOC is greater than the charging threshold is obtained, specifically: when the value of the charging cut-off SOC satisfies 80≤charging cut-off SOC≤100, the value of the vehicle controller charging cut-off SOC in the current case is: when the set charging cut-off SOC is less than 99, the vehicle controller charging cut-off SOC is equal to the sum of the set charging cut-off SOC and 0.9; when the set charging cut-off SOC is 99, the vehicle controller charging cut-off SOC is equal to the sum of the set charging cut-off SOC and 0.4; when the set charging cut-off SOC is 100, the vehicle controller charging cut-off SOC is equal to the set charging cut-off SOC; when the vehicle controller charging cut-off SOC is not less than the actual SOC of the battery, the vehicle controller stops charging. That is, based on the first charging cut-off SOC, the second charging cut-off SOC in the case where the first charging cut-off SOC is greater than the charging threshold is obtained, including: when the first charging cut-off SOC is less than 99, the sum of the first charging cut-off SOC and 0.9 is determined as the second charging cut-off SOC; when the first charging cut-off SOC is 99, the sum of the first charging cut-off SOC and 0.4 is determined as the second charging cut-off SOC; when the first charging cut-off SOC is 100, the first charging cut-off SOC is determined as the second charging cut-off SOC. Wherein, 99 refers to 99% of the battery capacity, 0.9 refers to 0.9% of the battery capacity, 0.4 refers to 0.4% of the battery capacity, and 100 refers to 100% of the battery capacity.

[0068] In the embodiment of the present application, the charging threshold corresponds to the minimum amount of electricity required to charge the battery. In the case where the first charging cut-off SOC is valid, the size relationship between the first charging cut-off SOC and the charging threshold needs to be considered. If the first charging cut-off SOC is greater than the charging threshold, the second charging cut-off SOC is determined by fine-tuning the first charging cut-off SOC. The first charging cut-off SOC is fine-tuned in combination with the set reference charging SOC (i.e. 99) to ensure that the final second charging cut-off SOC matches the current situation of the vehicle, ensuring the accuracy of the obtained charging cut-off SOC, so as to subsequently achieve accurate control of the battery charging.

[0069] S4, in the process of charging the battery by the vehicle controller, comparing the second charging cut-off SOC with the SOC of the battery, and based on the comparison result, controlling the charging operation of the vehicle controller to the battery.

[0070] In the embodiment of the present application, in the process of charging the battery by the vehicle controller, the actual SOC of the battery is obtained by the vehicle controller, so as to compare the second charging cut-off SOC with the actual SOC of the battery, to determine whether the amount of electricity of the battery reaches the set charging cut-off amount (i.e. the second charging cut-off SOC). If the actual amount of electricity of the battery reaches the second charging cut-off SOC, the charging of the battery is controlled to stop. If the actual amount of electricity of the battery does not reach the second charging cut-off SOC, the charging of the battery is continued, so as to ensure accurate control of the battery charging.

[0071] In the embodiment of the present application, the above step S4 is equivalent to comparing the vehicle controller charging cut-off SOC under different conditions with the actual SOC of the battery, to determine whether the vehicle controller charging cut-off SOC continues to charge.

[0072] In some embodiments, the SOC at which the vehicle controller stops charging is compared with the actual SOC of the battery to determine whether the vehicle controller continues to charge, specifically: when the instruction information of the set SOC at which the vehicle controller stops charging is invalid, the SOC at which the vehicle controller stops charging is a memory value; when the memory value is not less than the actual SOC of the battery, the vehicle controller stops charging the battery; when the memory value is less than the actual SOC of the battery, the vehicle controller continues to charge; when the value of the SOC at which the vehicle controller stops charging satisfies 0 < SOC at which the vehicle controller stops charging < 80, the SOC at which the vehicle controller stops charging is a memory value or a default value, and when the memory value or the default value is not less than the actual SOC of the battery, the vehicle controller stops charging. That is, based on the comparison result, the charging operation of the vehicle controller on the battery is controlled, including: when the second SOC at which the vehicle controller stops charging is greater than the SOC of the battery, the vehicle controller continues to charge the battery; or when the second SOC at which the vehicle controller stops charging is not greater than the SOC of the battery, the vehicle controller stops charging the battery.

[0073] In the embodiments of the present application, the second SOC at which the vehicle controller stops charging is determined based on the first SOC at which the vehicle controller stops charging, the instruction information and the charging threshold, so the second SOC at which the vehicle controller stops charging determined in different situations may be different, for example, the second SOC at which the vehicle controller stops charging may be a default value, a memory value or a value after fine adjustment of the first SOC at which the vehicle controller stops charging. Regardless of the second SOC at which the vehicle controller stops charging determined in any situation, the actual power of the battery is detected in real time during the charging of the battery by the vehicle controller, and the detected actual power of the battery is compared with the second SOC at which the vehicle controller stops charging, so as to determine whether the power of the battery is sufficient and whether the battery continues to be charged, so as to ensure accurate control of the charging of the battery.

[0074] S5, after the vehicle controller stops charging the battery, the battery enters a continuous discharge state; it is determined whether the battery satisfies a recharging condition after discharging, and if so, the battery is charged by the vehicle controller.

[0075] In the embodiments of the present application, the recharging condition refers to a condition required by the battery when the battery is charged again after the battery stops being charged by the vehicle controller. After the vehicle controller stops charging the battery, it indicates that the charging of the battery is completed, and then the battery enters a continuous discharge state, that is, the battery continuously discharges without being charged, so the power of the battery gradually decreases. If the battery satisfies the recharging condition after discharging, the battery is charged again by the vehicle controller, so as to ensure that the battery always has sufficient power and reduce the frequency of charging the battery.

[0076] In the embodiment of the present application, the step S5 corresponds to that when the SOC of the vehicle controller reaches the cut-off SOC, the battery continues to discharge, and it is determined whether the battery meets the charging condition again after discharging. If yes, the vehicle controller starts to charge; if not, the vehicle controller does not charge.

[0077] In some embodiments, it is determined whether the battery meets the charging condition again after discharging, specifically: when the actual SOC of the battery is not greater than the difference between the set cut-off SOC and 0.9, and the charging gun is not unplugged and the vehicle controller is not in sleep mode, the vehicle controller determines the charging condition and decides whether to allow charging; when the actual SOC of the battery is greater than the difference between the set cut-off SOC and 0.9, the vehicle controller does not respond to the charging request; when the actual SOC of the battery is less than the set cut-off SOC after the charging gun is plugged in again or the vehicle controller is in sleep mode and then wakes up, the vehicle controller determines the charging condition and decides whether to allow charging. That is, it is determined whether the battery meets the charging condition again after discharging, including: when the SOC of the battery is not greater than the difference between the first cut-off SOC and 0.9, and the charging gun is not unplugged and the vehicle controller is not in sleep mode, it is determined by the vehicle controller whether the battery meets the charging condition again; when the SOC of the battery is greater than the difference between the first cut-off SOC and 0.9, the vehicle controller does not respond to the charging request; when the SOC of the battery is less than the first cut-off SOC after the charging gun is plugged in again or the vehicle controller is in sleep mode and then wakes up, it is determined by the vehicle controller whether the battery meets the charging condition again. Wherein, 0.9 is 0.9% of the capacity of the battery.

[0078] In the embodiment of the present application, the user can insert the charging gun into the vehicle to charge the battery of the vehicle through the charging gun. After the charging gun is inserted into the vehicle, the battery is charged by the vehicle controller according to the above steps S1-S4, and when the battery reaches the second cut-off SOC, the charging of the battery is stopped. At this time, the user may not have unplugged the charging gun. In this way, after the battery is fully charged and enters a continuous discharge state, the vehicle controller does not detect in real time whether the battery meets the charging condition again, but determines whether the battery meets the charging condition again when the remaining capacity of the battery meets a certain condition, which can save the consumption of the battery by the vehicle controller.

[0079] In the embodiment of the present application, after the charging gun is inserted into the car, the battery is charged by the vehicle controller according to the above steps S1-S4, and after the battery reaches the second charging cut-off SOC, the charging of the battery is stopped, and then the user may pull out the charging gun. After that, the user may insert the charging gun into the car, indicating that the user still wants to charge the car. Or, after the car is parked, the vehicle controller may enter a sleep state, and if the vehicle controller enters the sleep state, the car cannot be controlled again, and when the vehicle controller enters the wake-up state from the sleep state, that is, the vehicle controller is woken up, the vehicle controller can control the battery of the car. In this case, after the battery charging is completed and enters the continuous discharging state, the vehicle controller does not detect whether the battery meets the recharging condition in real time, but judges whether the battery meets the recharging condition when the remaining power of the battery meets certain conditions, which can save the power consumption of the vehicle controller to the battery.

[0080] In the embodiment of the present application, after the battery is charged, the relationship between the charging gun and the car and the state of the vehicle controller also need to be considered, and the timing of the vehicle controller judging whether the battery meets the recharging condition is different in different situations. The influence of the relationship between the charging gun and the car and the state of the vehicle controller on the car charging is fully considered to realize accurate control of the battery charging, and at the same time, the power consumption of the battery can be reduced as much as possible in the uncharged state, thereby reducing the power consumption speed of the battery and reducing the charging frequency of the battery.

[0081] Alternatively, the charging condition is judged, specifically: based on the set charging cut-off SOC instruction information, judging whether the charging cut-off SOC instruction information is valid and the relationship with the charging threshold, and obtaining the vehicle controller charging cut-off SOC in different situations; comparing the vehicle controller charging cut-off SOC in different situations with the actual SOC of the battery, and judging whether the vehicle controller charging cut-off SOC continues to charge. That is, whether the battery meets the recharging condition is judged by the vehicle controller, including: based on the first charging cut-off SOC, obtaining the indication information; based on the first charging cut-off SOC, the indication information and the charging threshold, obtaining the second charging cut-off SOC; comparing the second charging cut-off SOC with the SOC of the battery, and based on the comparison result, controlling the charging operation of the vehicle controller to the battery.

[0082] In the embodiment of the present application, the process of judging whether the battery meets the recharging condition by the vehicle controller is the same as the above steps S2-S4, and will not be repeated here.

[0083] In the embodiment of the present application, the accurate control of battery charging can be realized by setting the charging cut-off SOC through the instrument and a series of judgments and comparisons, so as to avoid overcharging or undercharging, thereby prolonging the service life of the battery; the effective judgment of the charging cut-off SOC and the relationship with the charging threshold can stop charging at the appropriate time, avoid unnecessary energy waste, and improve the charging efficiency; the charging cut-off SOC corresponding to the vehicle controller is obtained according to different conditions, and compared with the actual SOC of the battery, which is helpful to fully utilize the capacity of the battery and optimize the performance of the battery. The scheme effectively avoids the charging cycle of the vehicle system repeatedly entering charging / charging end due to the apparent power-off fast, and the present application is easy to implement without complex program design, which can effectively improve the service life and health of the battery, make the charging more safe, and further reduce the cost of using the vehicle, ensure the stability of the electric vehicle, and enhance the driving experience and safety of the electric vehicle.

[0084] The method will be described in detail as follows:

[0085] The present application relates to 3 input signals and 1 input signal, a is an input signal, and the instrument displays SOC (integer type); the a signal is only used for displaying to the user; b is an input signal, and the instrument sets the charging cut-off SOC (integer type); c is an input signal, and the actual SOC of the battery (the precision is two digits after the decimal point); d is an output signal, and the charging cut-off SOC of the vehicle controller. When the user adjusts the charging cut-off SOC set by the instrument, b is sent to the vehicle controller, when the vehicle controller receives b, if 0 < b < 80, the set value is not responded this time, the original default value or the memory value is executed, if b is 0x0:Not_Active or 0xFE:Abnormal or 0xFF:Invalid, the memory value is executed, and the initial default value of the VCU is 100. If 80 ≤ b ≤ 100, according to the following logic, different d is judged according to c (the actual SOC of the battery);

[0086] Wherein, when b < 99, d = b + 0.9; when b = 99, d = b + 0.4; when b = 100, d = b; when d ≥ c, the vehicle controller stops charging.

[0087] When the charging cut-off SOC of the vehicle controller is met, the battery continues to discharge, and whether the battery meets the charging condition again after discharging is judged, if yes, the vehicle controller starts charging; if not, the vehicle controller does not charge.

[0088] If the charging gun is not unplugged and the vehicle controller is not in sleep mode, when the actual SOC of the battery is not greater than the difference between the set charging cut-off SOC and 0.9, the vehicle controller judges the charging condition and decides whether to allow charging; when the actual SOC of the battery is greater than the difference between the set charging cut-off SOC and 0.9, the vehicle controller does not respond to the charging request; if the charging gun is re-plugged or the vehicle controller is in sleep mode and then wakes up, when the actual SOC of the battery is less than the set charging cut-off SOC, the vehicle controller judges the charging condition and decides whether to allow charging.

[0089] The charging condition is judged, specifically: based on the instruction information of the set charging cut-off SOC, judging whether the instruction information of the charging cut-off SOC is valid and the relationship with the charging threshold, obtaining the vehicle controller charging cut-off SOC under different conditions; comparing the vehicle controller charging cut-off SOC under different conditions with the actual SOC of the battery, judging whether the vehicle controller charging cut-off SOC continues to charge.

[0090] Embodiment 2

[0091] The charging control system of the electric vehicle provided by the application comprises:

[0092] The information receiving module receives the instruction information of the charging cut-off SOC set based on the instrument; that is, the first charging cut-off SOC is received, which is the SOC set by the instrument when the battery charging is cut off.

[0093] The first judging module judges whether the instruction information of the charging cut-off SOC is valid and the relationship with the charging threshold based on the instruction information of the set charging cut-off SOC, and obtains the vehicle controller charging cut-off SOC under different conditions; that is, based on the first charging cut-off SOC, the instruction information is obtained, which indicates whether the first charging cut-off SOC is valid, and based on the first charging cut-off SOC, the instruction information and the charging threshold, the second charging cut-off SOC is obtained, which is the SOC used by the vehicle controller and when the battery charging is cut off.

[0094] The instruction information of the charging cut-off SOC is judged to be valid or not and the relationship with the charging threshold value, specifically: if the instruction information of the set charging cut-off SOC is judged to be invalid, the charging cut-off SOC of the vehicle controller under the condition that the charging cut-off SOC is invalid is obtained; if it is valid, the charging cut-off SOC is further judged to be greater than the charging threshold value; if it is less than, the charging cut-off SOC of the vehicle controller under the condition that the charging cut-off SOC is less than the charging threshold value is obtained; if it is greater than, the charging cut-off SOC of the vehicle controller under the condition that the charging cut-off SOC is greater than the charging threshold value is obtained according to the set charging cut-off SOC. That is, the second charging cut-off SOC is obtained based on the first charging cut-off SOC, the instruction information and the charging threshold value, including: if the instruction information indicates that the first charging cut-off SOC is invalid, the second charging cut-off SOC under the condition that the first charging cut-off SOC is invalid is obtained; or, if the instruction information indicates that the first charging cut-off SOC is valid, the first charging cut-off SOC is judged to be greater than the charging threshold value; if the first charging cut-off SOC is less than the charging threshold value, the second charging cut-off SOC under the condition that the first charging cut-off SOC is less than the charging threshold value is obtained; if the first charging cut-off SOC is greater than the charging threshold value, the second charging cut-off SOC under the condition that the first charging cut-off SOC is greater than the charging threshold value is obtained based on the first charging cut-off SOC.

[0095] If the instruction information of the set charging cut-off SOC is judged to be invalid, the charging cut-off SOC of the vehicle controller under the condition that the charging cut-off SOC is invalid is obtained, specifically: if the signal of the charging cut-off SOC is 0x0:Not_Active or 0xFE:Abnormal or 0xFF:Invalid, it is considered that the charging cut-off SOC is invalid, and the value of the charging cut-off SOC of the vehicle controller under the current condition is equal to the memory value, and the memory value is the power-off storage value received by the vehicle controller in the previous ignition cycle, ranging from 80 to 100. That is, the instruction information includes first instruction information and second instruction information, the first instruction information indicates that the first charging cut-off SOC is invalid, and the second instruction information indicates that the first charging cut-off SOC is valid; the instruction information is obtained based on the first charging cut-off SOC, including: if the signal of the first charging cut-off SOC is 0x0:Not_Active, 0xFE:Abnormal or 0xFF:Invalid, the first instruction information is obtained; if the instruction information indicates that the first charging cut-off SOC is invalid, the second charging cut-off SOC under the condition that the first charging cut-off SOC is invalid is obtained, including: if the first instruction information is obtained, the memory value is determined as the second charging cut-off SOC, and the memory value is the charging cut-off SOC received by the vehicle controller in the previous ignition cycle.

[0096] The SOC of the vehicle controller is obtained when the charging cut-off SOC is less than the charging threshold, specifically: when the value of the charging cut-off SOC satisfies 0 < charging cut-off SOC < 80, the value of the SOC of the vehicle controller in the current situation is a default value or a memory value; the default value is 100, which is the value set when the vehicle is manufactured. That is, if the first charging cut-off SOC is less than the charging threshold, the second charging cut-off SOC is obtained when the first charging cut-off SOC is less than the charging threshold, including: if the first charging cut-off SOC is less than the charging threshold, the default value or the memory value is determined as the second charging cut-off SOC; the default value is the charging cut-off SOC set when the vehicle is manufactured, and the memory value is the charging cut-off SOC received by the vehicle controller in the previous ignition cycle.

[0097] The SOC of the vehicle controller is obtained when the charging cut-off SOC is greater than the charging threshold according to the set charging cut-off SOC, specifically: when the value of the charging cut-off SOC satisfies 80 ≤ charging cut-off SOC ≤ 100, the value of the SOC of the vehicle controller in the current situation is: when the set charging cut-off SOC is less than 99, the SOC of the vehicle controller is equal to the sum of the set charging cut-off SOC and 0.9; when the set charging cut-off SOC is 99, the SOC of the vehicle controller is equal to the sum of the set charging cut-off SOC and 0.4; when the set charging cut-off SOC is 100, the SOC of the vehicle controller is equal to the set charging cut-off SOC; when the SOC of the vehicle controller is not less than the actual SOC of the battery, the vehicle controller stops charging. That is, based on the first charging cut-off SOC, the second charging cut-off SOC is obtained when the first charging cut-off SOC is greater than the charging threshold, including: when the first charging cut-off SOC is less than 99, the sum of the first charging cut-off SOC and 0.9 is determined as the second charging cut-off SOC; when the first charging cut-off SOC is 99, the sum of the first charging cut-off SOC and 0.4 is determined as the second charging cut-off SOC; when the first charging cut-off SOC is 100, the first charging cut-off SOC is determined as the second charging cut-off SOC. Wherein, 99 refers to 99% of the battery capacity, 0.9 refers to 0.9% of the battery capacity, 0.4 refers to 0.4% of the battery capacity, and 100 refers to 100% of the battery capacity.

[0098] The second judging module compares the SOC of the vehicle controller in different situations with the actual SOC of the battery, and judges whether the SOC of the vehicle controller continues to charge; that is, during the charging process of the battery by the vehicle controller, the second charging cut-off SOC is compared with the SOC of the battery, and based on the comparison result, the charging operation of the vehicle controller to the battery is controlled.

[0099] The vehicle controller charging cut-off SOC in different situations is compared with the actual SOC of the battery to determine whether the vehicle controller charging cut-off SOC continues to charge, specifically: when the set charging cut-off SOC instruction information is invalid, the vehicle controller charging cut-off SOC is a memory value; when the memory value is not less than the actual SOC of the battery, the vehicle controller stops charging the battery; when the memory value is less than the actual SOC of the battery, the vehicle controller continues to charge; when the value of the charging cut-off SOC satisfies 0 < charging cut-off SOC < 80, the vehicle controller charging cut-off SOC is a memory value or a default value, and when the memory value or the default value is not less than the actual SOC of the battery, the vehicle controller stops charging. That is, based on the comparison result, the charging operation of the vehicle controller on the battery is controlled, including: when the second charging cut-off SOC is greater than the SOC of the battery, the vehicle controller continues to charge the battery; or when the second charging cut-off SOC is not greater than the SOC of the battery, the vehicle controller stops charging the battery.

[0100] The third determination module determines whether the battery satisfies the recharging condition after discharging when the vehicle controller charging cut-off SOC is satisfied, and if so, starts charging the vehicle controller; if not, the vehicle controller does not charge; that is, after the vehicle controller stops charging the battery, the battery enters a continuous discharging state; it is determined whether the battery satisfies the recharging condition after discharging, and if so, the vehicle controller charges the battery.

[0101] It is determined whether the battery satisfies the recharging condition after discharging, specifically: when the battery actual SOC is not greater than the difference between the set charging cut-off SOC and 0.9, the vehicle controller determines the charging condition and decides whether to allow charging when the charging gun is not pulled out and the vehicle controller is not in sleep; when the battery actual SOC is greater than the difference between the set charging cut-off SOC and 0.9, the vehicle controller does not respond to the charging request; if the charging gun is re-plugged or the vehicle controller is in sleep and then wakes up, when the battery actual SOC is less than the set charging cut-off SOC, the vehicle controller determines the charging condition and decides whether to allow charging. That is, it is determined whether the battery satisfies the recharging condition after discharging, including: when the battery SOC is not greater than the difference between the first charging cut-off SOC and 0.9, the vehicle controller determines whether the battery satisfies the recharging condition when the charging gun is not pulled out and the vehicle controller is not in sleep; when the battery SOC is greater than the difference between the first charging cut-off SOC and 0.9, the vehicle controller does not respond to the charging request; if the charging gun is re-plugged or the vehicle controller is in sleep and then wakes up, when the battery SOC is less than the first charging cut-off SOC, the vehicle controller determines whether the battery satisfies the recharging condition. Wherein, 0.9 is 0.9% of the battery capacity.

[0102] The judgment of the charging condition is specifically: judging whether the instruction information of the charging cut-off SOC is valid and the relationship with the charging threshold based on the set instruction information of the charging cut-off SOC, obtaining the vehicle controller charging cut-off SOC under different conditions; comparing the vehicle controller charging cut-off SOC under different conditions with the actual SOC of the battery, and judging whether the vehicle controller charging cut-off SOC continues to charge. That is, whether the battery meets the recharging condition is judged by the vehicle controller, including: obtaining instruction information based on the first charging cut-off SOC; obtaining the second charging cut-off SOC based on the first charging cut-off SOC, the instruction information and the charging threshold; and comparing the second charging cut-off SOC with the SOC of the battery, and controlling the charging operation of the vehicle controller on the battery based on the comparison result.

[0103] The application provides a charging control system of an electric vehicle, which realizes charging control of the electric vehicle by dividing the system into an information receiving module, a first judging module, a second judging module and a third judging module.

[0104] Embodiment 3

[0105] Referring to FIG. 3, the application further provides an electronic device 100 for the charging control method of the electric vehicle; the electronic device 100 comprises a memory 101, at least one processor 102, a computer program 103 stored in the memory 101 and executable on the at least one processor 102, and at least one communication bus 104.

[0106] The memory 101 can be used for storing the computer program 103, and the processor 102 realizes the steps of the charging control method of the electric vehicle in embodiment 1 by running or executing the computer program stored in the memory 101 and calling the data stored in the memory 101. The memory 101 can mainly comprise a program storage area and a data storage area, wherein the program storage area can store an operating system, at least one application required by a function (such as a sound playing function, an image playing function, etc.) and the like; and the data storage area can store data (such as audio data) created according to the use of the electronic device 100 and the like. In addition, the memory 101 can comprise a non-volatile memory, for example, a hard disk, a memory, a plug-in hard disk, a smart media card (SMC), a secure digital (SD) card, a flash card, at least one disk storage device, a flash memory device, or other non-volatile solid-state storage devices.

[0107] The at least one processor 102 can be a central processing unit (CPU), and can also be other general-purpose processors, digital signal processors (DSPs), application specific integrated circuits (ASICs), field programmable gate arrays (FPGAs) or other programmable logic devices, discrete gates or transistor logic, discrete hardware components, etc. The processor 102 can be a microprocessor or the processor 102 can also be any conventional processor. The processor 102 is a control center of the electronic device 100, and is connected with various parts of the electronic device 100 through various interfaces and lines.

[0108] The memory 101 in the electronic device 100 stores a plurality of instructions to implement a charging control method of an electric vehicle, and the processor 102 can execute the plurality of instructions to implement:

[0109] Receiving instruction information of a charging cut-off SOC based on an instrument setting; that is, receiving a first charging cut-off SOC, which is a SOC at a battery charging cut-off time and is based on an instrument setting;

[0110] Based on the instruction information of the set charging cut-off SOC, judging whether the instruction information of the charging cut-off SOC is valid and in relation to a charging threshold, and obtaining a vehicle control unit charging cut-off SOC under different conditions; that is, based on the first charging cut-off SOC, obtaining indication information indicating whether the first charging cut-off SOC is valid; based on the first charging cut-off SOC, the indication information and the charging threshold, obtaining a second charging cut-off SOC, which is a SOC at a battery charging cut-off time and is used by the vehicle control unit;

[0111] Comparing the vehicle control unit charging cut-off SOC under different conditions with an actual SOC of the battery, and judging whether the vehicle control unit charging cut-off SOC continues to charge; that is, comparing the second charging cut-off SOC with the SOC of the battery during charging of the battery by the vehicle control unit, and based on the comparison result, controlling the charging operation of the battery by the vehicle control unit;

[0112] When the vehicle controller charging cut-off SOC is met, the battery continuously discharges, and it is judged whether the battery meets the recharging condition after discharging, if yes, the vehicle controller starts to charge the battery, if not, the vehicle controller does not charge the battery, that is, when the vehicle controller stops charging the battery, the battery enters the continuous discharging state, and it is judged whether the battery meets the recharging condition after discharging, if yes, the battery is charged by the vehicle controller.

[0113] The modules / units integrated in the electronic device 100, if implemented in the form of software function units and sold or used as independent products, can be stored in a computer readable storage medium. Based on such understanding, all or part of the processes in the above-mentioned embodiment methods can also be implemented by a computer program to instruct related hardware to complete, and the computer program can be stored in a computer readable storage medium. When the computer program is executed by a processor, the steps of each method embodiment described above can be implemented. The computer program includes computer program code, which can be in the form of source code, object code, executable files, or some intermediate forms. The computer readable medium can include any entity or device capable of carrying computer program code, recording medium, U disk, mobile hard disk, magnetic disk, optical disk, computer memory, and read-only memory (ROM).

[0114] Those skilled in the art should understand that the embodiments of the present application can be provided as a method, a system, or a computer program product. Therefore, the present application can take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application can take the form of a computer program product implemented on one or more computer usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer usable program code.

[0115] The present application is described with reference to flowcharts and / or block diagrams of the method, device (system), and computer program product according to the embodiments of the present application. It should be understood that each flow and / or block in the flowcharts and / or block diagrams, and the combination of the flows and / or blocks in the flowcharts and / or block diagrams can be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device produce a device for implementing the functions specified in one or more flows in the flowcharts and / or one or more blocks in the block diagrams.

[0116] These computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture including instructions which implement the function specified in the flowchart or flowsheets and / or block or blocks of the block diagrams.

[0117] These computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart or flowsheets and / or block or blocks of the block diagrams.

[0118] Finally, it should be noted that the above-mentioned embodiments are merely used to illustrate the technical solutions of the present application, but not to limit it. Although the present application has been described in detail with reference to the above-mentioned embodiments, those skilled in the art should understand that the specific embodiments of the present application can be modified or replaced equivalently without departing from the spirit and scope of the present application, and any modification or equivalent replacement without departing from the spirit and scope of the present application should be covered in the protection scope of the claims of the present application.

Claims

1. A charging control method of an electric vehicle, executed by a vehicle comprising a vehicle controller and a battery, the method comprising: receiving a first charge cut-off SOC, the first charge cut-off SOC being a SOC at which the battery is to be charged cut-off, based on an instrument setting; obtaining indication information indicating whether the first charge cut-off SOC is valid, based on the first charge cut-off SOC; obtaining a second charge cut-off SOC, based on the first charge cut-off SOC, the indication information and a charge threshold, the second charge cut-off SOC being a SOC at which the battery is to be charged cut-off, for use by the vehicle controller; comparing the second charge cut-off SOC with a SOC of the battery during charging of the battery by the vehicle controller, and controlling charging operation of the battery by the vehicle controller based on a comparison result; and controlling the battery to enter a continuous discharge state after the vehicle controller stops charging the battery, and determining whether the battery satisfies a re-charging condition after discharging, and charging the battery by the vehicle controller if the re-charging condition is satisfied. The obtaining of the second charge cut-off SOC, based on the first charge cut-off SOC, the indication information and the charge threshold, comprises: obtaining the second charge cut-off SOC in a case where the first charge cut-off SOC is invalid, if the indication information indicates that the first charge cut-off SOC is invalid; or determining whether the first charge cut-off SOC is greater than the charge threshold, if the indication information indicates that the first charge cut-off SOC is valid; obtaining the second charge cut-off SOC in a case where the first charge cut-off SOC is less than the charge threshold, if the first charge cut-off SOC is less than the charge threshold; and obtaining the second charge cut-off SOC in a case where the first charge cut-off SOC is greater than the charge threshold, based on the first charge cut-off SOC, if the first charge cut-off SOC is greater than the charge threshold. The indication information comprises first indication information and second indication information, the first indication information indicating that the first charge cut-off SOC is invalid, and the second indication information indicating that the first charge cut-off SOC is valid. The obtaining of the indication information, based on the first charge cut-off SOC, comprises: obtaining the first indication information, if a signal of the first charge cut-off SOC is 0x0:Not_Active, 0xFE:Abnormal or 0xFF:Invalid. The obtaining of the second charge cut-off SOC in the case where the first charge cut-off SOC is invalid, if the indication information indicates that the first charge cut-off SOC is invalid, comprises: determining a memory value as the second charge cut-off SOC, if the first indication information is obtained, the memory value being a charge cut-off SOC received by the vehicle controller in a previous ignition cycle. The obtaining of the second charge cut-off SOC in the case where the first charge cut-off SOC is less than the charge threshold, if the first charge cut-off SOC is less than the charge threshold, comprises:

2. The charging control method of the electric vehicle according to claim 1, wherein ​ ​ ​ 3. The charging control method of the electric vehicle according to claim 2, wherein ​ ​ ​ ​ ​ 4. The charging control method of the electric vehicle according to claim 2, wherein ​ If the first charge cut-off SOC is less than the charge threshold, a default value or a memory value is determined as the second charge cut-off SOC; the default value is a charge cut-off SOC set when the automobile is shipped, and the memory value is a charge cut-off SOC received by the vehicle controller in a previous ignition cycle.

5. The charging control method of the electric vehicle according to claim 2, wherein The second charge cut-off SOC under the condition that the first charge cut-off SOC is greater than the charge threshold is obtained based on the first charge cut-off SOC, and the second charge cut-off SOC is obtained based on the first charge cut-off SOC, the indication information and the charge threshold. When the first charge cut-off SOC is less than 99, a sum of the first charge cut-off SOC and 0.9 is determined as the second charge cut-off SOC; When the first charge cut-off SOC is 99, a sum of the first charge cut-off SOC and 0.4 is determined as the second charge cut-off SOC; When the first charge cut-off SOC is 100, the first charge cut-off SOC is determined as the second charge cut-off SOC.

6. The charging control method of the electric vehicle according to claim 1, wherein The charging operation of the vehicle controller on the battery is controlled based on the comparison result, and the charging operation of the vehicle controller on the battery is controlled based on the comparison result. When the second charge cut-off SOC is greater than the SOC of the battery, the vehicle controller continues to charge the battery; or When the second charge cut-off SOC is not greater than the SOC of the battery, the vehicle controller stops charging the battery.

7. The charging control method of the electric vehicle according to claim 1, wherein The determination of whether the battery satisfies the recharging condition after discharging includes: If the charging gun is not unplugged and the vehicle controller is not in sleep mode, when the SOC of the battery is not greater than the difference between the first charge cut-off SOC and 0.9, the vehicle controller determines whether the battery satisfies the recharging condition; when the SOC of the battery is greater than the difference between the first charge cut-off SOC and 0.9, the vehicle controller does not respond to the charging request; If the charging gun is re-plugged or the vehicle controller is in sleep mode and then wakes up, when the SOC of the battery is less than the first charge cut-off SOC, the vehicle controller determines whether the battery satisfies the recharging condition.

8. The charging control method of the electric vehicle according to claim 7, wherein The determination of whether the battery satisfies the recharging condition by the vehicle controller includes: The indication information is obtained based on the first charge cut-off SOC; The second charge cut-off SOC is obtained based on the first charge cut-off SOC, the indication information and the charge threshold; The second charge cut-off SOC is compared with the SOC of the battery, and the charging operation of the vehicle controller on the battery is controlled based on the comparison result.

9. A charging control system of an electric vehicle, comprising: an information receiving module, which receives a first charge cut-off SOC, the first charge cut-off SOC being a SOC at which the battery is charged cut off and being set based on an instrument; a first judging module configured to acquire indication information based on the first charging cut-off SOC, the indication information indicating whether the first charging cut-off SOC is valid, and acquire a second charging cut-off SOC based on the first charging cut-off SOC, the indication information and a charging threshold, the second charging cut-off SOC being a SOC at which the battery is to be charged cut off and used by the vehicle controller; a second judging module configured to compare the second charging cut-off SOC with a SOC of the battery during charging of the battery by the vehicle controller, and control charging of the battery by the vehicle controller based on a comparison result; a third judging module configured to control the battery to enter a continuous discharging state after the vehicle controller stops charging the battery, and judge whether the battery satisfies a recharging condition after discharging, and if so, charge the battery by the vehicle controller. 10.A terminal device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements steps of the charging control method of the electric vehicle according to any one of claims 1 to 8 when executing the computer program.

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