An electric vehicle charging method and device, electronic equipment and storage medium

Abstract

The application relates to the field of new energy vehicles and provides an electric vehicle charging method and device, electronic equipment and a storage medium. The method comprises the following steps: if the current battery temperature of a battery is greater than a first temperature threshold value and the current battery voltage is less than or equal to a first voltage threshold value, a charger is controlled to charge the battery in a first charging mode; if the first battery voltage of the battery is greater than the first voltage threshold value, the charger is controlled to suspend charging the battery; when the suspension charging duration is reached, the charger is controlled to charge the battery in a second charging mode; when the second battery voltage of the battery reaches a second voltage threshold value and the first battery power is greater than a first power threshold value, the charger is controlled to charge the battery in a third charging mode; and when the second battery power of the battery reaches a second power threshold value, the charger is controlled to charge the battery in a fourth charging mode until the battery capacity is sufficient. The application can improve the charging efficiency, reduce the damage to the battery and improve the charging safety.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of new energy vehicles, and in particular to an electric vehicle charging method and device, an electronic device, and a storage medium. BACKGROUND

[0002] Promoting the application of electric vehicles to replace traditional fuel vehicles is a major measure for China to achieve energy transformation. Under the strong support and guidance of national science and technology and industrial policies, the production and sales of electric vehicles in China will experience explosive growth in the next 10 years. However, as electric vehicles are promoted and popularized, the charging problems of electric vehicles also increase, and in particular, the charging efficiency and charging safety are problems that need to be solved urgently.

[0003] At present, the batteries of most electric vehicles on the market are charged using the matching chargers, and basically use the "constant current direct charging" charging method. This charging method has poor charging efficiency and causes great damage to the battery, and also easily causes charging safety problems. SUMMARY

[0004] Therefore, the embodiments of the present application provide an electric vehicle charging method, device, electronic device, and storage medium to solve the problems of poor charging efficiency of the existing charging method, great damage to the battery, and easily causing charging safety problems.

[0005] In a first aspect, the embodiments of the present application provide an electric vehicle charging method, comprising:

[0006] reading a current battery temperature and a current battery voltage of a battery of an electric vehicle;

[0007] if the current battery temperature is greater than a first temperature threshold and the current battery voltage is less than or equal to a first voltage threshold, controlling a charger to use a first charging mode to perform first stage charging on the battery;

[0008] if a first battery voltage of the battery after the first stage charging is greater than the first voltage threshold, controlling the charger to suspend the first stage charging on the battery and start calculating a suspension charging duration;

[0009] when the suspension charging duration reaches a preset duration threshold, controlling the charger to use a second charging mode to perform second stage charging on the battery;

[0010] when a second battery voltage of the battery after the second stage charging reaches a second voltage threshold and a first battery power of the battery is greater than a first power threshold, controlling the charger to use a third charging mode to perform third stage charging on the battery;

[0011] When the second battery power of the battery after the third stage charging reaches a second power threshold, the charger is controlled to use a fourth charging mode to perform a fourth stage charging on the battery until the battery capacity of the battery is sufficient, and the charging is ended.

[0012] In a second aspect, the embodiment of the present application provides an electric vehicle charging device, comprising:

[0013] The reading module is configured to read a current battery temperature and a current battery voltage of a battery of the electric vehicle.

[0014] The first control module is configured to control the charger to use a first charging mode to perform a first stage charging on the battery if the current battery temperature is greater than a first temperature threshold and the current battery voltage is less than or equal to a first voltage threshold.

[0015] The second control module is configured to control the charger to suspend the first stage charging on the battery and start calculating a suspension charging duration if the first battery voltage of the battery after the first stage charging is greater than the first voltage threshold.

[0016] The third control module is configured to control the charger to use a second charging mode to perform a second stage charging on the battery when the suspension charging duration reaches a preset duration threshold.

[0017] The fourth control module is configured to control the charger to use a third charging mode to perform a third stage charging on the battery when the second battery voltage of the battery after the second stage charging reaches a second voltage threshold and the first battery power of the battery is greater than a first power threshold.

[0018] The fifth control module is configured to control the charger to use a fourth charging mode to perform a fourth stage charging on the battery when the second battery power of the battery after the third stage charging reaches the second power threshold until the battery capacity of the battery is sufficient, and the charging is ended.

[0019] In a third aspect, the embodiment of the present application provides an electronic device, comprising 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 above method when executing the computer program.

[0020] In a fourth aspect, the embodiment of the present application provides a computer readable storage medium, which stores a computer program, and the computer program implements the steps of the above method when executed by a processor.

[0021] Compared with the prior art, the embodiment of the application has at least the following beneficial effects: by reading the current battery temperature and the current battery voltage of the battery of the electric vehicle, if the current battery temperature is greater than a first temperature threshold and the current battery voltage is less than or equal to a first voltage threshold, the charger is controlled to use a first charging mode to perform first stage charging on the battery, if the first battery voltage of the battery after the first stage charging is greater than the first voltage threshold, the charger is controlled to suspend the first stage charging on the battery and start calculating the suspension charging duration, when the suspension charging duration reaches a preset duration threshold, the charger is controlled to use a second charging mode to perform second stage charging on the battery, when the second battery voltage of the battery after the second stage charging reaches a second voltage threshold and the first battery power of the battery is greater than a first power threshold, the charger is controlled to use a third charging mode to perform third stage charging on the battery, and when the second battery power of the battery after the third stage charging reaches a second power threshold, the charger is controlled to use a fourth charging mode to perform fourth stage charging on the battery until the battery capacity of the battery is sufficient, and the charging is ended, that is, in the whole charging process, the charging mode used by the charger can be flexibly regulated according to the battery temperature, the battery voltage and the battery power of the battery of the electric vehicle, so that the charging efficiency is improved, the damage to the battery is greatly reduced, and the safety of the charging is improved. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0023] Figure 1 is a scene schematic diagram of an application scenario of the embodiment of the present application;

[0024] Figure 2 is a flow schematic diagram of an electric vehicle charging method provided by the embodiment of the present application;

[0025] Figure 3 is a driving route schematic diagram in the electric vehicle charging method provided by the embodiment of the present application;

[0026] Figure 4 is a schematic diagram of an electric vehicle charging device provided by the embodiment of the present application;

[0027] Figure 5 is a structural schematic diagram of an electronic device provided by the embodiment of the present application. DETAILED DESCRIPTION

[0028] In the following description, for purposes of explanation and not limitation, specific details are set forth such as particular architectures, techniques, etc. in order to provide a thorough understanding of the embodiments of the present application. However, it will be apparent to those skilled in the art that the present application can be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known methods, devices, and circuits are omitted so as not to obscure the description of the present application with unnecessary detail.

[0029] A method and device for charging an electric vehicle according to an embodiment of the present application will be described in detail below with reference to the accompanying drawings.

[0030] Figure 1 FIG. 1 is a schematic diagram of an application scenario according to an embodiment of the present application. The application scenario can include a charging controller 101, a charger 102, and a battery 103. The charging controller 101 can be connected to the charger 102 through a network, and the charger 102 can be electrically connected to the battery 103.

[0031] The charging controller 101 can be a control chip built in an electric vehicle, for example, an MCU (microcontroller unit), such as a single-chip microcomputer 51, or an MPU (micro processing unit), such as an ARM9. The charging controller 101 can also be a background server or the like set in a charging station.

[0032] The charger 102 can be a direct-current charging pile (commonly known as a fast-charging device) fixedly installed outside an electric vehicle, connected to an alternating-current power grid, and providing a small-power direct-current power supply for a storage battery of the electric vehicle. The charger 102 can also be an alternating-current charging pile fixedly installed outside an electric vehicle, connected to an alternating-current power grid, and providing an alternating-current power supply for a vehicle-mounted charging machine (i.e., a charging pile fixedly installed on the electric vehicle), and simultaneously having a billing function. The charger 102 can also be a charging pile fixedly installed on the ground or a wall, installed in a public building, a residential parking lot, or a charging station, and the like.

[0033] The battery 103 refers to a storage battery fixedly installed in an electric vehicle, which can be a lead-acid storage battery, a weak-acid alkaline storage battery, a nickel-hydrogen battery, a strong-alkaline storage battery, a lithium-ion battery, a sodium-sulfur battery, or a power lithium battery.

[0034] In an implementation scenario, when the electric vehicle travels to the charging station and the battery of the electric vehicle is connected to the charging pile (i.e., the charger 102) of the charging station, the charging controller 101 can start to read the current battery temperature and the current battery voltage of the battery 103 of the electric vehicle. If the current battery temperature is greater than the first temperature threshold and the current battery voltage is less than or equal to the first voltage threshold, the charger 102 is controlled to use the first charging mode to perform first-stage charging on the battery 103. If the first battery voltage of the battery 103 after the first-stage charging is greater than the first voltage threshold, the charger 102 is controlled to suspend the first-stage charging on the battery 103 and start to calculate the suspension charging duration. When the suspension charging duration reaches the preset duration threshold, the charger 102 is controlled to use the second charging mode to perform second-stage charging on the battery 103. When the second battery voltage of the battery 103 after the second-stage charging reaches the second voltage threshold and the first battery power of the battery 103 is greater than the first power threshold, the charger 102 is controlled to use the third charging mode to perform third-stage charging on the battery 103. When the second battery power of the battery 103 after the third-stage charging reaches the second power threshold, the charger 102 is controlled to use the fourth charging mode to perform fourth-stage charging on the battery 103, until the battery capacity of the battery 103 is sufficient, and the charging is ended. The above charging mode can flexibly control the charging mode used by the charger according to the battery temperature, the battery voltage and the battery power of the battery of the electric vehicle in the whole charging process, so as to improve the charging efficiency, greatly reduce the damage to the battery, and improve the safety of the charging.

[0035] It should be noted that the specific types, quantities and combinations of the charging controller 101, the charger 102 and the battery 103 can be adjusted according to the actual needs of the application scenario, and the embodiments of the present application do not limit this.

[0036] Figure 2 is a flowchart of an electric vehicle charging method provided by an embodiment of the present application. Figure 2 The electric vehicle charging method can be executed by Figure 1 the charging controller 101. As shown in Figure 2 , the electric vehicle charging method comprises the following steps:

[0037] Step S201, reading the current battery temperature and the current battery voltage of the battery of the electric vehicle.

[0038] In an implementation, the charging controller 101 can establish a network communication connection with the TBOX (Telematics Box, remote communication terminal) of the electric vehicle, and read the current battery temperature and the current battery voltage of the battery of the electric vehicle through the TBOX.

[0039] In another embodiment, the charging controller 101 can read the current battery temperature and the current battery voltage of the battery 103 of the electric vehicle via the charger 102 by establishing a network communication connection with the charger 102.

[0040] In yet another embodiment, the charging controller 101 can also establish a network communication connection directly with the battery 103 of the electric vehicle to read the current battery temperature and the current battery voltage of the battery 103.

[0041] If the current battery temperature is greater than the first temperature threshold and the current battery voltage is less than or equal to the first voltage threshold, the charger is controlled to use the first charging mode to charge the battery in the first stage in step S202.

[0042] The first temperature threshold can be set according to the battery characteristics of the battery of the electric vehicle. For example, for a lithium battery such as a lithium ion battery or a power lithium battery, the first temperature threshold is usually set to 10°C.

[0043] The first voltage threshold can be set according to the battery characteristics of the battery of the electric vehicle. For example, for a lithium battery such as a lithium ion battery or a power lithium battery with a rated voltage of 12V, the first voltage threshold is usually set to 10V.

[0044] The first charging mode is a protection charging mode.

[0045] In a low temperature environment, the performance of a lithium battery will be severely degraded. For example, at minus ten degrees Celsius, the charging efficiency of the battery of the electric vehicle is very low, and even cannot be charged. Not only is it difficult to fully charge, but also causes great damage to the battery, reduces the service life of the battery, and even can cause a safety accident. Therefore, when charging the battery of the electric vehicle, by reading the current battery temperature of the battery and ensuring that the temperature of the battery is higher than the first temperature threshold, the charging of the battery is performed. Not only can the charging efficiency of the battery be improved, but also the damage to the battery can be avoided, which is beneficial to prolong the service life of the battery and greatly reduces the probability of safety accidents and improves the safety of charging.

[0046] After the charger 102 is connected to the battery 103 of the electric vehicle, the charger 102 is powered on, the current battery voltage of the battery 103 is read and sent to the charging controller 101, and the charging controller 101 determines whether the current battery voltage is less than or equal to the first voltage threshold. If it is determined that the current battery voltage is less than the first voltage threshold, the charger 102 is controlled to use the first charging mode to charge the battery 103 in the first stage, so that the voltage of the battery is raised to exceed the first voltage threshold, and then the subsequent stage of charging is performed. This not only helps to improve the charging efficiency, reduce the damage to the battery, prolong the service life of the battery, reduce the incidence of safety accidents, and improve the safety of charging.

[0047] The embodiment of the present application controls the battery to be charged only when the current battery temperature of the battery is greater than the first temperature threshold, and controls the charger to use the first charging mode to perform first-stage charging on the battery when the current battery voltage is less than or equal to the first voltage threshold, so that the current battery voltage of the battery is increased to be greater than the first voltage threshold, and then the battery enters the subsequent charging stage, thereby improving the charging efficiency, reducing the damage to the battery, prolonging the service life of the battery, reducing the incidence of safety accidents, and improving the safety of charging.

[0048] In step S203, if the first battery voltage of the battery after the first-stage charging is greater than the first voltage threshold, the charger is controlled to suspend the first-stage charging on the battery, and the suspension charging duration is started to be calculated.

[0049] After the battery is subjected to the first-stage charging, and the first battery voltage of the battery is greater than the first voltage threshold, the charger is first controlled to suspend the first-stage charging on the battery, and the real-time state of the battery is monitored during this period to ensure that the battery is an effective battery, and then the subsequent charging stage is entered, thereby improving the charging efficiency and the charging safety.

[0050] In step S204, when the suspension charging duration reaches a preset duration threshold, the charger is controlled to use the second charging mode to perform second-stage charging on the battery.

[0051] The preset duration threshold can be flexibly set according to actual conditions, for example, can be set to 1 minute, 5 minutes, or 10 minutes, etc.

[0052] The second charging mode refers to constant-current charging of the battery, that is, charging the battery under a constant current. For a lithium battery, the constant current is generally selected to be about 0.2C, which is the best value to ensure the safety of battery charging.

[0053] By controlling the charger to use the second charging mode to perform second-stage charging on the battery, the maximization of the battery capacity can be ensured, and the charging safety can be improved.

[0054] In step S205, when the second battery voltage of the battery after the second-stage charging reaches a second voltage threshold, and the first battery power of the battery is greater than a first power threshold, the charger is controlled to use a third charging mode to perform third-stage charging on the battery.

[0055] The second voltage threshold is generally slightly greater than the rated voltage of the battery. For example, when the rated voltage of the battery is 12V, the second voltage threshold is generally set to 13V.

[0056] The first electric quantity threshold is usually set to be more than 70% of the total capacity of the battery. For example, if the total capacity of a battery is y ampere-hours, the first electric quantity threshold can be set to 0.75y ampere-hours, 0.78y ampere-hours, or the like.

[0057] The third charging mode refers to constant voltage charging of the battery. That is, the battery is charged with gradually decreasing current under constant voltage until the current decreases to about 0.01C.

[0058] In step S206, when the second battery electric quantity after the battery is charged in the third stage reaches the second electric quantity threshold, the charger is controlled to use the fourth charging mode to charge the battery in the fourth stage until the battery capacity is sufficient, and the charging is ended.

[0059] The second electric quantity threshold is usually set to be more than 95% of the total capacity of the battery. For example, if the total capacity of a battery is y ampere-hours, the first electric quantity threshold can be set to 0.95y ampere-hours, 0.98y ampere-hours, or the like.

[0060] The fourth charging mode refers to pulse charging of the battery, that is, small current pulse charging of the battery when the battery is nearly full, so as to compensate the battery drop by drop until the battery is fully charged.

[0061] The technical scheme provided by the embodiments of the present application flexibly adjusts and controls the charging mode used by the charger according to the battery temperature, the battery voltage, and the battery electric quantity of the battery of the electric vehicle in the whole charging process, so as to improve the charging efficiency, greatly reduce the damage to the battery, and improve the safety of the charging.

[0062] In some embodiments, the above step S201 specifically includes:

[0063] determining the driving start position, the driving end position, the current battery residual electric quantity, and the cruising mode of the electric vehicle;

[0064] calculating the maximum cruising driving distance of the electric vehicle according to the current battery residual electric quantity and the cruising mode;

[0065] determining the estimated arrival time of the user planning to arrive at the driving end position;

[0066] searching for the position of the energy supplement station closest to the driving start position;

[0067] determining the minimum required charging time of the electric vehicle based on the driving start position, the position of the energy supplement station, the driving end position, and the maximum cruising driving distance;

[0068] if the minimum required charging time is less than the estimated arrival time, issuing the energy supplement driving path to the electric vehicle so as to make the electric vehicle drive from the driving start position to the position of the energy supplement station;

[0069] After the electric vehicle drives to the energy supplement station position, the current battery temperature and the current battery voltage of the battery of the electric vehicle are read.

[0070] The driving start position, i.e. the current position of the electric vehicle.

[0071] The driving end position, i.e. the destination position that the user wants to go to.

[0072] The cruising mode mainly includes WLTC (World Light Vehicle Test Cycle) cruising, CLTC (China Light-duty Vehicle Test Cycle) cruising, NEDC (New European Driving Cycle) cruising and comprehensive cruising. The comprehensive cruising is the cruising capability of the vehicle determined based on the driving habit of the user.

[0073] The maximum cruising distance, i.e. the maximum distance that the electric vehicle can drive with the current remaining battery capacity of the power storage battery according to the selected cruising mode.

[0074] In an embodiment, the correspondence table of the battery capacity, the cruising mode and the cruising distance can be designed according to the real vehicle test, and then the maximum cruising distance of the electric vehicle can be obtained by looking up the table based on the obtained current remaining battery capacity and the cruising mode.

[0075] In an embodiment, the distance between the driving start position and the energy supplement station position is searched, which can be specifically that the current position of the electric vehicle (i.e. the driving start position) is taken as the center and the maximum cruising distance is taken as the radius to draw a circle, all the charging stations in the circle are searched, and the distance value between each charging station and the current position of the electric vehicle is calculated, and the charging station with the minimum distance value is determined as the energy supplement station position.

[0076] In order to avoid the electric vehicle from entering the "starvation" state due to insufficient power, a buffer cruising distance is generally set when the maximum cruising distance is estimated, which is generally set to about 10 km, that is, the maximum cruising distance here refers to the distance that the electric vehicle can drive with all the battery capacity minus the buffer cruising distance.

[0077] In some embodiments, based on the driving start position, the energy supplement station position, the driving end position and the maximum cruising distance, the minimum required charging time of the electric vehicle is determined, which specifically includes the following steps:

[0078] calculating a first driving time and a first driving distance of the electric vehicle from a driving start position to a position of the energy supplement station;

[0079] calculating a remaining driving distance based on the first driving distance and the maximum driving distance;

[0080] calculating a second driving distance and a second driving time from the position of the energy supplement station to a driving end position;

[0081] determining a minimum required charging amount of the electric vehicle based on the remaining driving distance and the second driving distance;

[0082] calculating a minimum required charging time of the electric vehicle based on the minimum required charging amount, the first driving time and the second driving time.

[0083] Referring to Figure 3 , assuming that a driving start position of the electric vehicle is point A, a driving end position is point B, and a position of the energy supplement station closest to the driving start position is point C, a first driving distance S AC of the electric vehicle from point A to point C is calculated, and a first driving time t AC is calculated based on the first driving distance S AC and an average driving speed V AC of the electric vehicle from point A to point C. Next, a remaining driving distance S res is calculated based on formula (1): S res =S con -S AC , wherein S con represents the maximum driving distance. A second driving distance S CB of the electric vehicle from point C to point B is calculated, and a second driving time t CB is calculated based on the second driving distance S CB and an average driving speed V CB of the electric vehicle from point C to point B. Then, a minimum driving distance S req required for charging and driving is calculated based on formula (2): S req =S CB -S res . A minimum required charging amount E min of the electric vehicle is calculated based on the minimum driving distance S req required for charging and driving and a driving mode of the electric vehicle. A required charging time t res is estimated based on the minimum required charging amount E min and a charging mode. A minimum required charging time t CB is calculated based on formula (3): t min =t res +t AC +t CB .min .

[0084] If the minimum required charging time t min is less than the estimated arrival time t exp , the electric vehicle is issued a charging travel path, i.e., the planned travel path of the electric vehicle from point A to point C.

[0085] By controlling the charging travel path to be issued to the electric vehicle under the premise that the minimum required charging time of the electric vehicle is less than the estimated arrival time, the electric vehicle is caused to travel to the charging station position for charging, so as to avoid delaying the user's planned trip and improve the user's experience. If the minimum required charging time of the electric vehicle is greater than or equal to the estimated arrival time, the electric vehicle can be considered to be replaced with a pre-charged battery, or the user can be asked in advance whether the estimated arrival time or the travel end position can be changed, etc., to ensure the smooth completion of the trip and provide the user with a better vehicle experience.

[0086] In some embodiments, after determining the charging station position, a communication connection can be established with the background server of the charging station position, and the charging space occupancy information and the shared charging facility information of the charging station position can be obtained through the background server. The shared charging facility information includes: ① whether a charging universal adapter (which can solve the charging difficulty to a certain extent) is provided, and the type of the battery of the electric vehicle suitable for the charging universal adapter; ② whether a battery quick replacement service is provided for the scenario that the battery may need to be replaced; and ③ charging fee information, etc.

[0087] The charging controller 101 can obtain the historical charging data of the electric vehicle and send it to the background server of the charging station position. After receiving the historical charging data, the background server analyzes the historical charging data to determine the charging preference of the user (including the user's preference for selecting more charging spaces, the frequency of renting shared charging facilities, etc.), and then, in combination with the real-time charging space occupancy information, the shared charging facility information, and the charging fee information of the charging station position, the charging information is pushed to the charging controller 101, and the charging controller 101 forwards the charging information to the terminal device (such as a smart phone) or the vehicle terminal of the user. The user can select a charging time period according to the charging information. The charging information includes recommended charging spaces, shared charging facilities, charging fees, etc. The charging fee includes the recommended charging space fee and the charging price of different charging time periods, etc.

[0088] The charging controller 101 receives the user-selected recommended charging parking space and shared charging facility, and then performs path planning according to the power compensation station position and the driving starting position, generates a power compensation driving path, and sends the path to the vehicle controller of the electric vehicle. After receiving the power compensation driving path, the vehicle controller controls the electric vehicle to drive from the driving starting position to the power compensation station position.

[0089] In some embodiments, the step S202 specifically includes:

[0090] If the current battery temperature is less than the first temperature threshold, the battery heating system is started to heat the battery, and the first battery temperature of the battery during the heating process is monitored.

[0091] If the first battery temperature is greater than or equal to the first temperature threshold, and the current battery voltage of the battery is less than or equal to the first voltage threshold, the charger is controlled to use the first charging mode to perform first-stage charging on the battery.

[0092] The battery heating system mainly includes a heating film arranged on the surface of the battery, a temperature sensor, an adjustable direct-current stabilized power supply, and a heating controller. The heating controller is connected with the adjustable direct-current stabilized power supply and the temperature sensor. The temperature sensor is arranged between the heating film and the battery, and the adjustable direct-current stabilized power supply is connected with the heating film. The heating film can be polyimide, silicone rubber heating film, PET polyester film, etc.

[0093] The heating controller is connected with the charging controller.

[0094] In an embodiment, when the charging controller monitors that the current battery temperature of the battery of the electric vehicle is less than the first temperature threshold, a heating instruction is sent to the heating controller. After receiving the heating instruction, the heating controller starts the adjustable direct-current stabilized power supply to power on and heat the heating film. The heating film generates heat under the power-on state of the adjustable direct-current stabilized power supply, and transfers the heat to the battery, so that the temperature of the battery rises. During the process of power-on heating, the heating controller monitors the first battery temperature (i.e. the temperature of the battery after heating by the heating film) of the battery in real time through the temperature sensor, and feeds back the first battery temperature to the charging controller.

[0095] The charging controller sends a charging instruction to the charger to make the charger use the first charging mode to perform first-stage charging on the battery, when determining that the first battery temperature of the battery is greater than or equal to the first temperature threshold, and the current battery voltage of the battery is less than or equal to the first voltage threshold.

[0096] In some embodiments, the step S203 specifically includes:

[0097] The second battery temperature of the battery during the first charging stage is collected.

[0098] If the second battery temperature is greater than or equal to the second temperature threshold, the battery heating system is controlled to stop heating the battery.

[0099] The charger is controlled to continue the first stage charging of the battery using the first charging mode until the first battery voltage is greater than the first voltage threshold, and the first stage charging of the battery is paused.

[0100] The second battery temperature refers to the temperature of the battery during the first stage charging due to the heat generated by the battery charging and the heating of the heating film.

[0101] The second temperature threshold is a temperature threshold set by comprehensively considering the heat generation efficiency of the heating film surface, the heat generated by the battery charging, the safe charging temperature of the battery, and the safe heating temperature. For a polyimide heating film and a lithium battery, the second temperature threshold is generally set to 25°C according to the battery characteristics of the lithium battery and the heat generation characteristics of the polyimide heating film.

[0102] When the charging controller monitors that the second battery temperature of the battery is greater than or equal to the second temperature threshold, a stop heating instruction is sent to the heating controller. After receiving the stop heating instruction, the heating controller turns off the switch of the adjustable DC voltage regulator to stop the power supply to the heating film. Then, the charging controller continues to control the charger to use the first charging mode for the first stage charging of the battery until the first battery voltage is greater than the first voltage threshold.

[0103] In some embodiments, in the step S202, the charger is controlled to use the first charging mode for the first stage charging of the battery, including:

[0104] The actual SOC jump value and the predicted SOC jump value of the battery of the electric vehicle during the first stage charging are collected;

[0105] The deviation value of the actual SOC jump value and the predicted SOC jump value is calculated;

[0106] If the deviation value is not within the preset error range, the predicted SOC jump value is corrected based on the deviation value to obtain a corrected SOC jump value;

[0107] When the deviation value of the corrected SOC jump value and the actual SOC jump value is within the preset error range, the charger is controlled to use the first charging mode to pause the first stage charging of the battery.

[0108] The actual SOC jump value refers to the battery charge amount of the battery at a certain voltage, current, or temperature obtained by looking up a table.

[0109] The predicted SOC jump value refers to the real-time battery charge amount read by the instrument SOC.

[0110] SOC jump, i.e. system on chip jump, is an important factor causing the failure of electric vehicles. The main reason for the SOC jump is that the battery management system (BMS) has a large error in estimating the SOC (state of charge) of the battery. The accuracy of the SOC directly or indirectly affects the accuracy of other functions (such as power prediction).

[0111] To further ensure the charging safety of the electric vehicle, during the charging, the actual SOC jump value and the predicted SOC jump value of the battery of the electric vehicle in the first stage charging process can be collected. Then, the deviation value of the actual SOC jump value and the predicted SOC jump value is calculated. Then, according to the deviation value, the correction coefficient K is calculated by table lookup, and then the predicted SOC jump value is corrected in reverse according to the correction coefficient K, to obtain the corrected SOC jump value.

[0112] In some embodiments, in the step S202, the charger is controlled to use the first charging mode to charge the battery in the first stage, including:

[0113] Collecting surrounding environment information of the electric vehicle;

[0114] If it is determined according to the surrounding environment information that the probability of the electric vehicle having a charging obstacle during the first stage charging process is greater than or equal to a preset probability threshold, the charger is controlled to use the first charging mode to suspend the first stage charging of the battery.

[0115] The surrounding environment information includes the image of the charging equipment wire state collected by the camera device arranged at the position of the energy supplement station, the image information of other charging vehicles around the electric vehicle, etc.

[0116] The camera device sends the collected surrounding environment information to the charging controller, and the charging controller can input the surrounding environment information into the pre-trained neural network model for analysis after receiving the surrounding environment information, and output the probability value of the electric vehicle having a charging obstacle during the first stage charging process.

[0117] In an embodiment, the first probability value of the electric vehicle itself having a safety accident (such as the electric vehicle catching fire, etc.) during the charging process, the second probability value of other electric vehicles around the electric vehicle having a charging safety accident (such as the vehicle catching fire, etc.), and the third probability value of the charging equipment at the position of the energy supplement station having a charging safety accident (such as the charging wire aging and breaking causing electric leakage, etc.) during the charging process can be obtained by analyzing the image information collected by the camera device. Then, the first probability value, the second probability value and the third probability value are weighted and averaged to obtain the probability value of the electric vehicle having a charging obstacle during the first stage charging process.

[0118] The preset probability threshold can be flexibly set according to actual conditions, for example, can be set to 1%, 2%, 5%, etc.

[0119] If the probability value of the charging obstacle occurring in the first stage charging process of the electric vehicle is greater than or equal to the preset probability threshold, the charger is controlled to suspend the first stage charging of the battery using the first charging mode, so as to avoid the charging safety accident and ensure the safety of the charging.

[0120] All the optional technical solutions can be combined to form optional embodiments of the present application, which will not be repeated here.

[0121] The following is an embodiment of the device of the present application, which can be used to execute the method embodiments of the present application. For details not disclosed in the device embodiments of the present application, please refer to the method embodiments of the present application.

[0122] Figure 4 is a schematic diagram of an electric vehicle charging device provided by an embodiment of the present application. As shown in Figure 4 The electric vehicle charging device includes:

[0123] The reading module 401 is configured to read the current battery temperature and the current battery voltage of the battery of the electric vehicle;

[0124] The first control module 402 is configured to control the charger to perform the first stage charging of the battery using the first charging mode if the current battery temperature is greater than the first temperature threshold and the current battery voltage is less than or equal to the first voltage threshold;

[0125] The second control module 403 is configured to control the charger to suspend the first stage charging of the battery and start calculating the suspension charging duration if the first battery voltage after the first stage charging of the battery is greater than the first voltage threshold;

[0126] The third control module 404 is configured to control the charger to perform the second stage charging of the battery using the second charging mode when the suspension charging duration reaches the preset duration threshold;

[0127] The fourth control module 405 is configured to control the charger to perform the third stage charging of the battery using the third charging mode when the second battery voltage after the second stage charging of the battery reaches the second voltage threshold and the first battery power of the battery is greater than the first power threshold;

[0128] The fifth control module 406 is configured to control the charger to perform the fourth stage charging of the battery using the fourth charging mode when the second battery power after the third stage charging of the battery reaches the second power threshold, until the battery capacity of the battery is sufficient, and the charging is ended.

[0129] The technical scheme provided by the embodiments of the present application flexibly regulates the charging mode used by the charger according to the battery temperature, the battery voltage and the battery power of the battery of the electric vehicle in the whole charging process, so that the charging efficiency is improved, the damage to the battery is greatly reduced, and the safety of charging is improved.

[0130] In some embodiments, the reading module 401 comprises:

[0131] The first determining unit is configured to determine a driving start position, a driving end position, a current battery residual power and a cruising mode of the electric vehicle.

[0132] The mileage calculating unit is configured to calculate a maximum cruising driving mileage of the electric vehicle according to the current battery residual power and the cruising mode.

[0133] The second determining unit is configured to determine a predicted arrival time of the user planning to arrive at the driving end position.

[0134] The searching unit is configured to search for a position of a power supplement station closest to the driving start position.

[0135] The third determining unit is configured to determine a minimum required charging time of the electric vehicle based on the driving start position, the position of the power supplement station, the driving end position and the maximum cruising driving mileage.

[0136] The issuing unit is configured to issue a power supplement driving path to the electric vehicle to make the electric vehicle drive from the driving start position to the position of the power supplement station if the minimum required charging time is less than the predicted arrival time.

[0137] The reading unit is configured to read the current battery temperature and the current battery voltage of the battery of the electric vehicle after the electric vehicle drives to the position of the power supplement station.

[0138] In some embodiments, the third determining unit comprises:

[0139] The first calculating component is configured to calculate a first driving time and a first driving mileage of the electric vehicle driving from the driving start position to the position of the power supplement station.

[0140] The second calculating component is configured to calculate a remaining cruising driving mileage according to the first driving mileage and the maximum cruising driving mileage.

[0141] The third calculating component is configured to calculate a second driving mileage and a second driving time from the position of the power supplement station to the driving end position.

[0142] The determining component is configured to determine a minimum required charging power of the electric vehicle according to the remaining cruising driving mileage and the second driving mileage.

[0143] A fourth computing component is configured to calculate a minimum required charging time of the electric vehicle according to the minimum required charging amount, the first travel time, and the second travel time.

[0144] By controlling to further issue the energy supplement travel path to the electric vehicle under the premise that the minimum required charging time of the electric vehicle is less than the expected arrival time, the electric vehicle is caused to travel to the energy supplement station for charging, so as to avoid delaying the user's planned trip and improve the user's experience. If the minimum required charging time of the electric vehicle is greater than or equal to the expected arrival time, the electric vehicle can be considered to be replaced with a battery fully charged in advance, or the user can be asked in advance whether the expected arrival time or the travel end position can be changed, and the like, to ensure the smooth completion of the trip and provide the user with a better vehicle experience.

[0145] In some embodiments, the first control module 402 includes:

[0146] A heating unit is configured to start a battery heating system to heat the battery if the current battery temperature is less than a first temperature threshold, and monitor a first battery temperature of the battery during the heating process.

[0147] A first control unit is configured to control the charger to use a first charging mode to perform first stage charging on the battery if the first battery temperature is greater than or equal to the first temperature threshold, and the current battery voltage of the battery is less than or equal to a first voltage threshold.

[0148] In some embodiments, the second control module 403 includes:

[0149] A collection unit is configured to collect a second battery temperature of the battery during the first charging stage.

[0150] A second control unit is configured to control the battery heating system to stop heating the battery if the second battery temperature is greater than or equal to a second temperature threshold.

[0151] A third control unit is configured to continue to control the charger to use the first charging mode to perform the first stage charging on the battery until the first battery voltage is greater than the first voltage threshold, and pause the first stage charging on the battery.

[0152] In some embodiments, the first control module 402 includes:

[0153] A first collection unit is configured to collect an actual SOC jump value and a predicted SOC jump value of the battery of the electric vehicle during the first stage charging.

[0154] A computing unit is configured to calculate a deviation value of the actual SOC jump value and the predicted SOC jump value.

[0155] The correction unit is configured to correct the predicted SOC jump value based on the deviation value if the deviation value is not within the preset error range, so as to obtain the corrected SOC jump value.

[0156] The fourth control unit is configured to control the charger to suspend the first stage of charging the battery using the first charging mode when the deviation between the corrected SOC jump value and the actual SOC jump value is within a preset error range.

[0157] In other embodiments, the first control module 402 described above includes:

[0158] The second acquisition unit is configured to acquire information about the surrounding environment of the electric vehicle;

[0159] The fifth control unit is configured to control the charger to suspend charging the battery in the first stage using the first charging mode if it is determined from the surrounding environment information that the probability of a charging failure will occur during the first stage of charging of the electric vehicle is greater than or equal to a preset probability threshold.

[0160] It should be understood that the sequence number of each step in the above embodiments does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0161] Figure 5 This is a schematic diagram of the electronic device 5 provided in an embodiment of this application. Figure 5 As shown, the electronic device 5 of this embodiment includes: a processor 501, a memory 502, and a computer program 503 stored in the memory 502 and executable on the processor 501. When the processor 501 executes the computer program 503, it implements the steps in the various method embodiments described above. Alternatively, when the processor 501 executes the computer program 503, it implements the functions of each module / unit in the various device embodiments described above.

[0162] Electronic device 5 can be a desktop computer, laptop, handheld computer, cloud server, or other electronic device. Electronic device 5 may include, but is not limited to, processor 501 and memory 502. Those skilled in the art will understand that... Figure 5 This is merely an example of electronic device 5 and does not constitute a limitation on electronic device 5. It may include more or fewer components than shown, or different components.

[0163] The processor 501 can be a central processing unit (CPU), or other general purpose processors, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, etc.

[0164] The memory 502 can be an internal storage unit of the electronic device 5, for example, a hard disk or a memory of the electronic device 5. The memory 502 can also be an external storage device of the electronic device 5, for example, a plug-in hard disk, a smart media card (SMC), a secure digital (SD) card, a flash card, etc. equipped on the electronic device 5. The memory 502 can also include both the internal storage unit and the external storage device of the electronic device 5. The memory 502 is used to store computer programs and other programs and data required by the electronic device.

[0165] Those skilled in the art can clearly understand that, for the convenience and brevity of description, only the above division of functional units and modules is taken as an example, and in actual application, the above functions can be completed by different functional units and modules according to needs, that is, the internal structure of the device is divided into different functional units or modules to complete all or part of the above described functions. Each functional unit and module in the embodiment can be integrated in one processing unit, or each unit can exist physically, or two or more units can be integrated in one unit. The above integrated unit can be realized in the form of hardware or in the form of software functional unit.

[0166] The integrated modules / units, if implemented in the form of software functional 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 completed by a computer program instructing related hardware, and the computer program can be stored in a computer readable storage medium. The computer program can be executed by a processor to implement the steps of the above-mentioned various method embodiments. The computer program can include 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 the computer program code, recording medium, U disk, mobile hard disk, magnetic disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electric carrier signal, telecommunication signal, and software distribution medium, etc. It should be noted that the content included in the computer readable medium can be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction, for example, in some jurisdictions, according to legislation and patent practice, the computer readable medium does not include electric carrier signals and telecommunication signals.

[0167] The above embodiments are only used to illustrate the technical solutions of the present application, rather than limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacements for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application.

Claims

1. An electric vehicle charging method, characterized by, The method comprises the following steps: reading the current battery temperature and the current battery voltage of the battery of the electric vehicle; if the current battery temperature is greater than a first temperature threshold and the current battery voltage is less than or equal to a first voltage threshold, controlling the charger to use a first charging mode to perform first-stage charging on the battery; during the first-stage charging, collecting an actual SOC jump value and a predicted SOC jump value of the battery and calculating a deviation value of the actual SOC jump value and the predicted SOC jump value, correcting the predicted SOC jump value according to the deviation value to obtain a corrected SOC jump value, and when the deviation value of the corrected SOC jump value and the actual SOC jump value is within a preset error range, controlling the charger to use the first charging mode to suspend the first-stage charging on the battery; if the first battery voltage of the battery after the first-stage charging is greater than the first voltage threshold, controlling the charger to suspend the first-stage charging on the battery and start calculating a suspension charging duration; when the suspension charging duration reaches a preset duration threshold, controlling the charger to use a second charging mode to perform second-stage charging on the battery; when the second battery voltage of the battery after the second-stage charging reaches a second voltage threshold and the first battery capacity of the battery is greater than a first capacity threshold, controlling the charger to use a third charging mode to perform third-stage charging on the battery; when the second battery capacity of the battery after the third-stage charging reaches a second capacity threshold, controlling the charger to use a fourth charging mode to perform fourth-stage charging on the battery until the battery capacity of the battery is sufficient and the charging is ended.

2. The method of claim 1, wherein, if the current battery temperature is greater than a first temperature threshold and the current battery voltage is less than or equal to a first voltage threshold, controlling the charger to use a first charging mode to perform first-stage charging on the battery, which comprises the following steps: if the current battery temperature is less than the first temperature threshold, starting a battery heating system to heat the battery and monitoring a first battery temperature of the battery during the heating process; if the first battery temperature is greater than or equal to the first temperature threshold and the current battery voltage of the battery is less than or equal to the first voltage threshold, controlling the charger to use the first charging mode to perform first-stage charging on the battery.

3. The method of claim 2, wherein, if the first battery voltage of the battery after the first-stage charging is greater than the first voltage threshold, controlling the charger to suspend the first-stage charging on the battery, which comprises the following steps: collecting a second battery temperature of the battery during the first charging stage; if the second battery temperature is greater than or equal to a second temperature threshold, controlling the battery heating system to stop heating the battery; continuing to control the charger to use the first charging mode to perform the first-stage charging on the battery until the first battery voltage is greater than the first voltage threshold, and suspending the first-stage charging on the battery.

4. The method of claim 1, wherein, controlling the charger to use the first charging mode to perform the first-stage charging on the battery, which comprises the following steps: collecting surrounding environment information of the electric vehicle; If it is determined according to the surrounding environment information that the probability of the electric vehicle encountering charging obstacles during the first-stage charging process is greater than or equal to a preset probability threshold, the charger is controlled to suspend the first-stage charging of the battery using the first charging mode.

5. The method of claim 1, wherein, reading a current battery temperature and a current battery voltage of a battery of an electric vehicle, comprising: determining a driving start position, a driving end position, a current battery remaining capacity and a cruising mode of the electric vehicle; calculating a maximum cruising driving distance of the electric vehicle according to the current battery remaining capacity and the cruising mode; determining a predicted arrival time of a user planning to arrive at the driving end position; searching for a nearest energy supplement station position from the driving start position; determining a minimum required charging time of the electric vehicle based on the driving start position, the energy supplement station position, the driving end position and the maximum cruising driving distance; if the minimum required charging time is less than the predicted arrival time, issuing an energy supplement driving path to the electric vehicle to drive the electric vehicle from the driving start position to the energy supplement station position; after the electric vehicle drives to the energy supplement station position, reading a current battery temperature and a current battery voltage of a battery of the electric vehicle.

6. The method of claim 5, wherein, determining a minimum required charging time of the electric vehicle based on the driving start position, the energy supplement station position, the driving end position and the maximum cruising driving distance, comprising: calculating a first driving time and a first driving distance of the electric vehicle from the driving start position to the energy supplement station position; calculating a remaining cruising driving distance according to the first driving distance and the maximum cruising driving distance; calculating a second driving distance and a second driving time from the energy supplement station position to the driving end position; determining a minimum required charging amount of the electric vehicle according to the remaining cruising driving distance and the second driving distance; calculating the minimum required charging time of the electric vehicle according to the minimum required charging amount, the first driving time and the second driving time.

7. An electric vehicle charging device, characterized by comprising: a reading module configured to read a current battery temperature and a current battery voltage of a battery of an electric vehicle; a first control module configured to control a charger to perform first-stage charging of the battery using a first charging mode if the current battery temperature is greater than a first temperature threshold and the current battery voltage is less than or equal to a first voltage threshold; during the first-stage charging process, an actual SOC jump value and a predicted SOC jump value of the battery are collected and a deviation value of the actual SOC jump value and the predicted SOC jump value is calculated, the predicted SOC jump value is corrected according to the deviation value to obtain a corrected SOC jump value, and the charger is controlled to suspend the first-stage charging of the battery using the first charging mode when the deviation value of the corrected SOC jump value and the actual SOC jump value is within a preset error range; a second control module configured to control the charger to suspend the first-stage charging of the battery if a first battery voltage of the battery after the first-stage charging is greater than the first voltage threshold, and to start calculating a suspension charging duration. a third control module configured to control the charger to perform a second stage charging on the battery using a second charging mode when the pause charging duration reaches a preset duration threshold; a fourth control module configured to control the charger to perform a third stage charging on the battery using a third charging mode when a second battery voltage of the battery after the second stage charging reaches a second voltage threshold and a first battery power of the battery is greater than a first power threshold; a fifth control module configured to control the charger to perform a fourth stage charging on the battery using a fourth charging mode when a second battery power of the battery after the third stage charging reaches a second power threshold, until a battery capacity of the battery is sufficient, and the charging is ended.

8. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, The processor implements the steps of the method of any one of claims 1-6 when executing the computer program.

9. A computer-readable storage medium storing a computer program, the computer program comprising instructions that, when executed by a computer, cause the computer to perform the method of any one of claims 1 to 8. The computer program, when executed by the processor, implements the steps of the method of any one of claims 1-6.

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