Charging control method, device, apparatus, and vehicle

Abstract

The application provides a charging control method, device, equipment and vehicle. The method comprises the following steps: acquiring a first voltage of a power battery in a target vehicle and a second voltage of a charging pile, wherein the second voltage is a maximum voltage value output by the charging pile; if the first voltage is greater than the second voltage, then the first voltage is stepped down according to the second voltage, the power battery voltage drop is determined as a third voltage, and the third voltage is less than the second voltage; the charging pile is controlled to charge the target vehicle at the third voltage, the third voltage is stepped up to a fourth voltage, and the fourth voltage is less than the second voltage; and the power battery is controlled to enter a step-up charging state according to the fourth voltage until it is fully charged. In the above manner, the power battery can be charged in a full voltage range, and switching between direct charging and step-up charging is not needed, so that the vehicle charging control process is simplified.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of new energy vehicle charging, and in particular to a charging control method, device, equipment and vehicle. BACKGROUND

[0002] At present, new energy vehicles use an 800V voltage platform to improve charging speed and reduce vehicle manufacturing costs, but there are still some charging piles on the market with a maximum output voltage of 500V, so such charging piles cannot charge vehicles with an 800V voltage platform. Therefore, there is an urgent need for a charging method that can charge vehicles with a high voltage platform using a low voltage charging pile. SUMMARY

[0003] In view of the above-mentioned shortcomings of the prior art, the purpose of the present application is to provide a charging control method, device, equipment and vehicle to solve the problem that a low voltage charging pile cannot adapt to a high voltage platform vehicle.

[0004] To achieve the above-mentioned purpose and other related purposes, a first aspect of the present application provides a charging control method, comprising: acquiring a first voltage of a power battery in a target vehicle and a second voltage of a charging pile, wherein the second voltage is the maximum voltage value output by the charging pile; if the first voltage is greater than the second voltage, then reducing the first voltage according to the second voltage, determining a third voltage as the voltage drop of the power battery, and the third voltage is less than the second voltage; controlling the charging pile to charge the target vehicle at the third voltage, and increasing the third voltage to a fourth voltage, and the fourth voltage is less than the second voltage; and controlling the power battery to enter a voltage-boosting charging state according to the fourth voltage until it is fully charged.

[0005] In some embodiments of the present application, the step of reducing the first voltage according to the second voltage to determine the third voltage as the voltage drop of the power battery comprises: determining a voltage drop request value according to a preset voltage drop coefficient and the second voltage, wherein the preset voltage drop coefficient is determined by a conduction duty cycle; and reducing the first voltage according to the voltage drop request value to determine the third voltage as the voltage drop of the power battery.

[0006] In some embodiments of the present application, the control of the charging pile to charge the target vehicle at the third voltage and the boosting of the third voltage to a fourth voltage comprises: transmitting the third voltage to the charging pile, and if the charging pile detects that the voltage of the power battery is the third voltage, charging the target vehicle at the third voltage; then, determining a boosting request value according to a preset boosting coefficient and the second voltage, the preset boosting coefficient being associated with the complement of the initial duty cycle; boosting the third voltage to the fourth voltage according to the boosting request value, and determining the current charging voltage to be boosted to the fourth voltage.

[0007] In some embodiments of the present application, the charging control method further comprises: determining the output voltage value of the charging pile to be direct current of the third voltage; boosting the direct current by using a voltage converter, boosting the third voltage to the fourth voltage according to the boosting request value, and charging the power battery, so that the power battery enters the boosted charging state until it is fully charged.

[0008] In some embodiments of the present application, before the first voltage is greater than the second voltage, the method further comprises: comparing the first voltage of the power battery with the second voltage of the charging pile; if the first voltage is less than or equal to the second voltage, charging the target vehicle in a direct charging mode; if the first voltage is greater than the second voltage, predicting to charge the target vehicle in a boosted charging mode.

[0009] In some embodiments of the present application, the acquisition of the first voltage of the power battery in the target vehicle and the second voltage of the charging pile comprises: sending a charging request from the target vehicle to the charging pile; after determining the target vehicle according to the charging request, sending an interaction request to the target vehicle; and acquiring the first voltage of the power battery in the target vehicle and the second voltage of the charging pile in response to the feedback signal of the interaction request.

[0010] In some embodiments of the present application, before the control of the power battery to enter the boosted charging state according to the fourth voltage, the method further comprises: acquiring a current first temperature value of the power battery; if the first temperature value is lower than and not within a preset temperature interval, heating the power battery until the first temperature value is heated to a preset temperature, the preset temperature being a lower temperature point within the preset temperature interval; if the first temperature value is higher than and not within the preset temperature interval, cooling the power battery until the first temperature value is cooled to be within the preset temperature interval.

[0011] The second aspect of the present application provides a charging control device, comprising: an acquisition module configured to acquire a first voltage of a power battery in a target vehicle and a second voltage of a charging pile, wherein the second voltage is a maximum voltage value output by the charging pile; a voltage reduction module configured to, if the first voltage is greater than the second voltage, reduce the first voltage according to the second voltage, determine a third voltage as a voltage drop of the power battery, and the third voltage is less than the second voltage; a voltage boosting module configured to control the charging pile to charge the target vehicle at the third voltage, and boost the third voltage to a fourth voltage, and the fourth voltage is less than the second voltage; and a charging control module configured to control the power battery to enter a voltage-boosting charging state according to the fourth voltage until fully charged.

[0012] The third aspect of the present application provides an electronic device, comprising: one or more processing devices; a memory configured to store one or more programs; and when the one or more programs are executed by the one or more processing devices, the one or more processing devices implement the charging control method described above.

[0013] The fourth aspect of the present application provides a vehicle comprising the charging control device described above or the electronic device described above.

[0014] As described above, one technical solution of the charging control method, device, equipment and vehicle provided by the present application has the following beneficial effects:

[0015] The present application compares the first voltage of the power battery in the target vehicle with the second voltage of the charging pile, and if the first voltage is greater than the second voltage, the first voltage is reduced to a third voltage according to the second voltage. The charging pile is controlled to charge the target vehicle at the third voltage, and the third voltage is boosted to a fourth voltage. The power battery is controlled to enter a voltage-boosting charging state according to the fourth voltage until fully charged. In this way, the full voltage range of the power battery is boosted for charging, avoiding switching between direct charging and voltage boosting. This not only eliminates the need to design a new charging circuit, simplifies the circuit structure and reduces production costs, but also optimizes the vehicle charging control process. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 An implementation environment diagram of a charging control method provided by the present application is shown;

[0017] Figure 2 A flowchart of a charging control method provided by the present application is shown;

[0018] Figure 3 An implementation flowchart of a charging control method provided by the present application is shown;

[0019] Figure 4 a structural block diagram of a charging control device provided in the present application is shown;

[0020] Figure 5 a structural schematic diagram of a charging control device provided in the present application is shown;

[0021] Figure 6 a structural schematic diagram of an electronic device suitable for implementing the embodiments of the present application is shown. DETAILED DESCRIPTION

[0022] The embodiments of the present application are described below by way of specific concrete examples, and those skilled in the art can easily understand other advantages and effects of the present application from the disclosure of the present specification. The present application can also be implemented or applied by means of other different specific embodiments, and various modifications or changes can be made to the details in the present specification based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0023] It should be noted that the diagrams provided in the following embodiments only illustrate the basic concept of the present application in a schematic manner, and only the components related to the present application are shown in the diagrams, not the number, shape and size of the components when actually implemented. The shape, number and proportion of each component when actually implemented can be arbitrarily changed, and the layout form of the components can also be more complex.

[0024] The embodiments of the present application provide a charging control method, which can be applied to a vehicle terminal, can also be applied to a charging pile, and can also be software running in the vehicle terminal or the charging pile. For example, please refer to Figure 1 An implementation environment diagram of a charging control method provided in the present application is shown, and the charging control method in the present application can be applied to the scene of charging control. For example, as shown in Figure 1 The execution subject of the method provided in the embodiments of the present application can be a charging pile 200 or a target vehicle 100. The full voltage range of the power battery is boosted for charging, which avoids switching between direct charging and voltage boosting. Not only does it not need to design a new charging circuit, but also simplifies the circuit structure, reduces the production cost, and optimizes the vehicle charging control process.

[0025] Currently, some power batteries with wide voltage ranges have a portion of their output voltage within the low-voltage charging station's range and another portion outside of it. For example, the low-voltage charging station's voltage range is 250-500V, while the battery's voltage range is 300-750V. When the battery's current voltage is greater than 500V, an electric drive system is used for boost charging. If the battery's current voltage is less than 500V, the charging station can choose either conventional direct charging or boost charging. If direct charging is selected, the battery voltage will be boosted during the charging process. When the battery voltage is outside the charging station's output voltage range, charging cannot proceed, and conventional direct charging needs to be switched to boost charging. However, this makes the control system more complex, with more intricate control logic.

[0026] Generally, when an 800V platform vehicle encounters a low-voltage charging station, based on the timing relationship of DC charging vehicle-charging station interaction in GB / T 27930-2015, the vehicle should first send the voltage of its power battery. The charging station will then send its output capacity only if the voltage is within its output range. At the same time, before the charging station officially outputs power, it will detect that the battery voltage sent by the vehicle is close to the voltage detected by the charging station before energy transfer will occur. Otherwise, the charging process will be terminated and charging will fail.

[0027] The present application will now be described in detail through specific embodiments. Please refer to [link / reference]. Figure 2 As shown, Figure 2 The flowchart of the charging control method provided in this application embodiment includes the following steps:

[0028] Step S210: Obtain the first voltage of the power battery in the target vehicle and the second voltage of the charging pile, wherein the second voltage is the maximum voltage value output by the charging pile;

[0029] Among them, the target vehicles are new energy vehicles, such as pure electric vehicles, hybrid electric vehicles, fuel cell electric vehicles, supercapacitor vehicles, flywheel energy storage vehicles, and even flying cars or aircraft.

[0030] It should be noted that the first voltage of the power battery and the second voltage of the charging pile are determined in the following ways. For example, a charging request from the target vehicle is sent to the charging pile; after determining the target vehicle based on the charging request, an interaction request is sent to the target vehicle; in response to the feedback signal of the interaction request, for example, the second voltage of the charging pile is obtained by identifying the first feedback signal from the charging pile, or, for example, the first voltage of the power battery in the target vehicle is obtained by identifying the second feedback signal from the target vehicle.

[0031] If the first voltage is greater than the second voltage, the first voltage is stepped down according to the second voltage, and the power battery voltage drop is determined as a third voltage, and the third voltage is less than the second voltage.

[0032] Specifically, the first voltage is stepped down according to the second voltage, and the power battery voltage drop is determined as a third voltage, including:

[0033] A voltage drop request value is determined according to a preset voltage drop coefficient and the second voltage, wherein the preset voltage drop coefficient is determined by a signal conduction duty cycle of a semiconductor device such as SIC (Silicon Carbide) or IGBT (Insulated Gate Bipolar Transistor), and the signal conduction duty cycle refers to a ratio of a time in a conduction state to a whole control cycle time.

[0034] Of course, the preset voltage drop coefficient can also be determined based on factors such as the type of battery, the specification of the charging pile, the safety standard, or the charging efficiency requirement, which will not be described here. In addition, the voltage drop request value indicates that the power battery needs to be lowered to a target voltage value to ensure safe and efficient charging.

[0035] The first voltage is stepped down according to the voltage drop request value, and the power battery voltage drop is determined as a third voltage.

[0036] Specifically, the voltage drop is realized by a voltage conversion module or a voltage converter, or involves using specific electronic components or algorithms to gradually adjust the voltage of the power battery.

[0037] In the above manner, not only can the third voltage of the power battery be ensured to be lower than the second voltage of the charging pile, but also the charging safety can be ensured.

[0038] In step S230, the charging pile is controlled to charge the target vehicle at the third voltage, and the third voltage is stepped up to a fourth voltage, and the fourth voltage is less than the second voltage.

[0039] It should be noted that the control of the charging pile to charge the target vehicle at the third voltage and the step-up of the third voltage to the fourth voltage includes:

[0040] The third voltage is transmitted to the charging pile, and if the charging pile detects that the voltage of the power battery is the third voltage, the target vehicle is charged according to the third voltage; and then,

[0041] Specifically, when the voltage of the power battery reported by the target vehicle is the third voltage, by comparing whether the current actual voltage of the power battery is the same as the third voltage, the purpose of detecting the voltage is achieved. If they are equal, it is detected that the voltage of the power battery is the third voltage, and the target vehicle is charged according to the third voltage. If they are not equal, the detection fails, and charging is not performed.

[0042] The boosting request value is determined according to a preset boosting coefficient and the second voltage, and the preset boosting coefficient is associated with the complement of the initial duty cycle.

[0043] Specifically, the third voltage is boosted to more effectively utilize the output capability of the charging pile. The boosting request value is determined according to a preset boosting coefficient and the second voltage. The preset boosting coefficient is associated with the complement of the initial duty cycle, that is, the coefficient corresponding to one minus the initial duty cycle is the preset boosting coefficient. For example, the boosting initial duty cycle cannot be too small, otherwise the load capacity of the boosting circuit may not be strong, and the selected duty cycle is basically above 5%.

[0044] The third voltage is boosted according to the boosting request value, and the current charging voltage is boosted to a fourth voltage.

[0045] Specifically, the third voltage is boosted according to the boosting request value, that is, the charging voltage of the power battery is boosted to a fourth voltage by the voltage converter, so as to more effectively charge.

[0046] In step S240, the power battery is controlled to enter a boosting charging state according to the fourth voltage until it is fully charged.

[0047] Optionally, in some embodiments, the charging control method further comprises:

[0048] The charging control method further comprises:

[0049] Specifically, the output voltage of the charging pile is adjusted to match the third voltage of the power battery after voltage reduction. The voltage converter is a device capable of changing the voltage level, which is used to increase the voltage according to the preset boosting request value until the required boosting request value is reached. The power battery is continuously charged with the fourth voltage to keep the power battery in a boosting charging state, so that the power battery can more effectively receive electric energy, thereby speeding up the charging speed. The charging state of the power battery is continuously monitored, and the charging process is stopped when the power battery is fully charged to ensure charging safety.

[0050] In this embodiment, on the one hand, the full voltage range of the power battery is boosted for charging, avoiding switching between direct charging and boosting, which not only does not need to design a new charging circuit, simplifies the circuit structure, reduces the production cost, but also optimizes the vehicle charging control process; on the other hand, through accurate control and management of the power battery and the charging pile voltage, the safety and efficiency of the charging process can be ensured, and the power supply capacity of the charging pile can be maximized.

[0051] Optionally, in some embodiments, before the first voltage is greater than the second voltage, further comprising:

[0052] Comparing the first voltage of the power battery with the second voltage of the charging pile;

[0053] If the first voltage is less than or equal to the second voltage, the target vehicle is charged in a direct charging mode;

[0054] If the first voltage is greater than the second voltage, the target vehicle is expected to be charged in a boost charging mode.

[0055] First, the first voltage of the power battery and the second voltage of the charging pile are compared to determine the relationship between the current voltage of the power battery and the maximum output voltage that the charging pile can provide.

[0056] Second, if the first voltage is less than or equal to the second voltage, the target vehicle is charged in a direct charging mode; for example, if the first voltage of the power battery is less than or equal to the second voltage of the charging pile, the output voltage of the charging pile can directly meet the charging demand of the power battery, in which case, the direct charging mode is adopted, i.e. directly using the output voltage of the charging pile to charge the target vehicle. The direct charging mode is usually simple and direct, without the need for additional voltage conversion steps, so the charging efficiency is relatively high.

[0057] Third, if the first voltage is greater than the second voltage, the target vehicle is expected to be charged in a boost charging mode; for example, if the first voltage of the power battery is greater than the second voltage of the charging pile, the output voltage of the charging pile is not enough to directly charge the power battery, in which case, the boost charging mode is expected to be adopted, and the voltage of the input power battery is boosted through a voltage converter to ensure that the battery is in a boost charging state.

[0058] In this embodiment, by comparing the voltages of the two, the direct charging or boost charging mode can be intelligently selected to ensure the safety and efficiency of the charging process, which helps to improve the flexibility and adaptability of the charging system, so that it can adapt to the charging demand under different voltage conditions.

[0059] Optionally, in some embodiments, before the fourth voltage is used to control the power battery to enter the boost charging state, the method further comprises:

[0060] obtaining a current first temperature value of the power battery;

[0061] if the first temperature value is lower than and not within a preset temperature range, heating the power battery until the first temperature value is heated to a preset temperature, the preset temperature being a lower temperature point within the preset temperature range;

[0062] if the first temperature value is higher than and not within a preset temperature range, cooling the power battery until the first temperature value is cooled to within the preset temperature range.

[0063] For example, the first temperature value is obtained by a temperature sensor installed on the power battery; and the preset temperature range is set according to the optimal working temperature range of the power battery, to ensure that the power battery can maintain efficient energy conversion and a long service life during the charging process.

[0064] If the first temperature value is lower than the preset temperature range, it means that the current temperature of the power battery is too low to affect its charging efficiency and performance. In this case, a heating mechanism is started to heat the power battery until its temperature rises to a preset temperature. The preset temperature is a lower temperature point within the preset temperature range, which represents the minimum temperature at which the power battery can start safe charging.

[0065] If the first temperature value is higher than the preset temperature range, it means that the current temperature of the power battery is too high to cause safety problems or reduce charging efficiency. In this case, cooling measures are taken, such as increasing the speed of a cooling fan or starting a liquid cooling system, to cool the power battery until its temperature falls within the preset temperature range.

[0066] In this embodiment, by monitoring and adjusting the temperature of the power battery in real time, the charging process can be optimized, the charging efficiency can be improved, and the safety and stability of the power battery can be ensured.

[0067] Please refer to Figure 3 for a charging control method implementation flowchart provided by the present application, which is described in detail as follows:

[0068] Step 1: The vehicle charges at a low-voltage pile, the charging gun is connected, and the user swipes a card or scans a code

[0069] Step 2: During the vehicle-pile fast charging message interaction process, the BMS first sends the voltage of the power storage battery, which is contained in the vehicle-pile interaction message BCP.

[0070] Step 3, BMS requests MC to step down the voltage of the power battery, the step-down value Ureq1 is equal to the BCP sending value, and the MCU finally ensures that the step-down pre-charge value of Uc1 is Ureq1

[0071] Step 4, after the MCU completes the step-down, the BS requests the MCU to step up the voltage of the power battery, the step-up value is Ureq2, and the MCU finally maintains the voltage of Ue1 as Ureq2

[0072] Step 5, when the battery voltage is low, the BMS dynamically adjusts Ureq2 to improve the power conversion efficiency of the charging power during the step-up process due to the gradual increase of the battery voltage.

[0073] In some embodiments, for the convenience of explaining the step-up control scheme in the full voltage range of the battery, the following gives the relationship between the battery voltage, the step-down phase request value, the step-up phase request value and the duty cycle. Some parameter selection explanations in the following table are given:

[0074] For example, the step-down request value Ureq1 = 440 is selected according to the following value: on the one hand, it must be within the capability range of the charging pile to ensure that most charging piles can output; on the other hand, the difference between this value and the battery voltage cannot be too small, otherwise the step-down cannot be completed.

[0075] For example, using a step-down circuit, the input-output relationship is as follows:

[0076] Ureq1 = a Ubat, where a is the on-duty cycle of SIC or IGBT, Ubat is the input voltage, and Ureq1 is the output voltage.

[0077] The input-output voltage relationship of the step-up phase is: Ubat = Ureq2 / (1-a), and a can be derived as a = 1-Ureq2 / Ubat, where Ubat is the output voltage and Ureq2 is the input voltage.

[0078] The step-up request value Ureq2 = 475 is selected according to the following value: on the one hand, it should be close to the maximum output capability of the low-voltage pile (close to 500V); on the other hand, it should ensure that the output voltage of the charging pile is greater than this step-up request value, for example, the maximum output request voltage of the charging pile is set to 490V.

[0079] The step-up initial duty cycle cannot be too small, otherwise the load carrying capacity of the step-up circuit may not be strong, and the selected duty cycle is basically above 5%.

[0080]

[0081] In this embodiment, after merging and arranging the above parameters, the corresponding relationship between the battery voltage and the step-down phase voltage request value is as follows:

[0082]

[0083] In the embodiment, the correspondence between the battery voltage and the voltage request value in the boost phase is as follows:

[0084]

[0085] First, when Ubat≥500V, the BMS requests different values from the MCU during the buck and boost phases, so when Ubat≥500V, Ureq needs to rise from 440V to 475V, and the rising rule is as follows:

[0086] When the system switches from buck to boost, the BMS simultaneously raises Ureq1=Uc1 from 440V to Ureq2=475V at a rate of 4V / s.

[0087] Second, when Ubat<500V, the BMS requests the same value from the voltage conversion module during the buck and boost phases. To improve the charging power in the boost phase, Ureq2 also needs to be raised accordingly after the battery voltage is raised, for example, when Ubat=400V enters the boost phase, Ureq2=360V, and during the charging process, when Ubat>420V, Ureq should be raised from 360V to 440V at a rate of 4V / s. When Ureq2 rises from 440V to 475V, it also rises at a rate of 4V / s to ensure smooth transition during the boost process.

[0088] Please refer to Figure 4 A structure block diagram of a charging control device 400 provided for the application, comprising:

[0089] An acquisition module 401 is configured to acquire a first voltage of a power battery in a target vehicle and a second voltage of a charging pile, wherein the second voltage is a maximum voltage value output by the charging pile;

[0090] A buck module 402 is configured to, if the first voltage is greater than the second voltage, buck the first voltage according to the second voltage, determine a third voltage as a voltage drop of the power battery, and the third voltage is less than the second voltage;

[0091] A boost module 403 is configured to control the charging pile to charge the target vehicle at the third voltage, and raise the third voltage to a fourth voltage, and the fourth voltage is less than the second voltage;

[0092] A charging control module 404 is configured to control the power battery to enter a boost charging state according to the fourth voltage until it is fully charged.

[0093] It should be noted that the charging control method and the charging control device are in a one-to-one correspondence relationship. Here, the technical details and technical effects involved in the charging control device are the same as the above-mentioned identification method, and will not be described one by one. Please refer to the above charging control method.

[0094] The charging control device of the present application compares the first voltage of the power battery in the target vehicle with the second voltage of the charging pile. If the first voltage is greater than the second voltage, the first voltage is voltage-reduced to a third voltage according to the second voltage. The charging pile is controlled to charge the target vehicle at the third voltage, and the third voltage is boosted to a fourth voltage. The power battery is controlled to enter a boost charging state according to the fourth voltage until it is fully charged. In this way, the full voltage range of the power battery is boosted and charged, avoiding switching between direct charging and boosting. This not only eliminates the need to design a new charging circuit, simplifies the circuit structure, and reduces production costs, but also optimizes the vehicle charging control process.

[0095] Please refer to Figure 5 The structure of a charging control device provided by the present application is shown in the following schematic diagram:

[0096] The charging control device is installed in a new energy vehicle and comprises a battery module 1, a voltage conversion module 2, a capacitor 3, a first contactor 4 and a second contactor 5. The voltage conversion module 2 is electrically connected to the positive and negative poles of the battery module 1. The capacitor 3 is connected in series with the battery module 1. One end of the capacitor 3 is electrically connected to the voltage conversion module 2, and the other end of the capacitor 3 is electrically connected to the positive pole of the battery module 1. The first contactor 4 is arranged in series between the capacitor 3 and the positive pole of the battery module 1. The second contactor 5 is arranged in series between the capacitor 3 and the voltage conversion module 2. The voltage conversion module 2 comprises a motor controller and a motor. The battery module 1 is a power storage battery of the vehicle. When the vehicle is in a drivable state, the motor controller, the motor and the power storage battery jointly constitute a drive system to convert electrical energy into mechanical energy to drive the vehicle to travel. However, when the vehicle is charging, the vehicle is in an undrivable state to ensure charging safety. At this time, the motor and the motor controller can be reused as the voltage conversion module 2 to realize voltage reduction of the power storage battery. Specifically, the high-voltage direct-current end of the motor controller is directly connected to the positive and negative poles of the power storage battery, the three-phase windings of the motor are connected between the three groups of bridge arms of the motor controller, and one end of any one of the three-phase windings of the motor is connected to the second contactor 5. Compared with the motor neutral point outlet mode adopted in the prior art, this wiring mode does not need to connect a compensation inductor in series on the high-voltage bus, which can effectively save the volume and cost. It should be noted that the internal structure of the motor and the motor controller is a technology known to those skilled in the art, and therefore will not be described here. In addition, the battery module 1, the voltage conversion module 2 and the capacitor 3 jointly constitute a BUCK circuit by closing the first contactor 4 and the second contactor 5. The BUCK circuit is also called a voltage reduction circuit, and its basic feature is a DC-DC conversion circuit with an output voltage lower than an input voltage. The voltage of the battery module 1 is converted by the voltage conversion module 2 to establish a voltage across the capacitor 3, which can reduce the output voltage of the battery module 1 and be compatible with a low-voltage pile.

[0097] The positive electrode of the battery module 1 is connected in series with the third contactor 6, the first resistor 7 is arranged between the third contactor 6 and the positive electrode of the battery module 1, the fourth contactor 8 is arranged between the positive electrode of the battery module 1 and the voltage conversion module 2, the fourth contactor 8 is arranged in parallel with the third contactor 6, the fifth contactor 9 is arranged between the negative electrode of the battery module 1 and the voltage conversion module 2, before charging the battery module 1, the high voltage on the vehicle system is charged first, and the specific process is as follows: the fifth contactor 9 is closed first, then the third contactor 6 is closed to charge the support capacitor included in the voltage conversion module 1, when the voltage of the support capacitor is pre-charged to be close to the voltage of the battery module 1, the fourth contactor 8 is closed and the third contactor 6 is disconnected, and the high voltage is powered on, so that the fourth contactor 8 and the fifth contactor 9 are always in the closed state when the charging pile 10 charges the battery module 1, and it needs to be noted that the first resistor 7 can limit the charging current of the support capacitor, so as to prevent the support capacitor from being instantaneously short-circuited due to the direct closing of the fourth contactor 8.

[0098] In one specific embodiment of the present disclosure, the capacitor 3 is connected in series with the charging pile 10, the positive electrode of the charging pile 10 is connected in series with the positive electrode of the battery module 1, the sixth contactor 11 is connected in series between the positive electrode of the battery module 1 and the first contactor 4, and the negative electrode of the charging pile 10 is connected in series with the negative electrode of the battery module 1. In the case that the first contactor 4 and the second contactor 5 are closed, the sixth contactor 11 is closed, and the charging pile 10, the capacitor 3, the voltage conversion module 2 and the battery module 1 jointly constitute a BOOST circuit, wherein the BOOST circuit is one of six basic chopper boost circuits and is also a switching DC boost circuit, which can make the output voltage higher than the input voltage. According to the BOOST circuit, the output voltage of the charging pile 10 is boosted, and when the charging pile 10 is a low-voltage pile, the low-voltage pile is used to charge the high-voltage storage battery, and the charging efficiency of the low-voltage pile is effectively improved.

[0099] In one specific embodiment of the present disclosure, the capacitor 3 is connected in series with the charging pile 10, the positive electrode of the charging pile 10 is connected in series with the positive electrode of the battery module 1, the sixth contactor 11 is connected in series between the positive electrode of the battery module 1 and the first contactor 4, and the negative electrode of the charging pile 10 is connected in series with the negative electrode of the battery module 1. In the case that the first contactor 4 and the second contactor 5 are closed, the sixth contactor 11 is closed, and the charging pile 10, the capacitor 3, the voltage conversion module 2 and the battery module 1 jointly constitute a BOOST circuit, wherein the BOOST circuit is one of six basic chopper boost circuits and is also a switching DC boost circuit, which can make the output voltage higher than the input voltage. According to the BOOST circuit, the output voltage of the charging pile 10 is boosted, and when the charging pile 10 is a low-voltage pile, the low-voltage pile is used to charge the high-voltage storage battery, and the charging efficiency of the low-voltage pile is effectively improved.

[0100] In one specific embodiment of the present disclosure, the negative electrode of the charging pile 10 is connected in series with the negative electrode of the battery module 1, the seventh contactor 13 is connected in series between the negative electrode of the charging pile 10 and the negative electrode of the battery module 1, and the seventh contactor 13 is connected in parallel with the second contactor 5. When the charging pile 10 is a high-voltage pile, the sixth contactor 11 and the seventh contactor 13 are closed, and the first contactor 4 and the second contactor 5 are disconnected, so that the high-voltage pile can directly charge the battery module 1, and the charging efficiency is greatly improved.

[0101] In one specific embodiment of the present disclosure, the control method of the charging control device further comprises: obtaining an insulation detection output voltage of the charging pile; determining the type of the charging pile according to the insulation detection output voltage of the charging pile; and controlling each contactor in the direct-current charging voltage boosting device according to at least the type of the charging pile, so as to realize the charging of the battery module by the charging pile.

[0102] Optionally, a first preset voltage is obtained; and it is determined whether the insulation detection output voltage of the charging pile is greater than the first preset voltage, wherein if the insulation detection output voltage of the charging pile is greater than or equal to the first preset voltage, the charging pile is directly determined as a high-voltage pile; and if the insulation detection output voltage of the charging pile is less than the first preset voltage, preset vehicle charging demand information is obtained and the type of the charging pile is further determined according to the preset vehicle charging demand information.

[0103] Optionally, when the insulation detection output voltage of the charging pile is greater than or equal to the first preset voltage, the type of the charging pile is a high-voltage pile, the first contactor and the second contactor are controlled to be disconnected, and the sixth contactor and the seventh contactor are controlled to be closed.

[0104] Optionally, when the insulation detection output voltage of the charging pile is less than the first preset voltage and the type of the charging pile is a high-voltage pile, the first contactor and the second contactor are controlled to be closed.

[0105] When the difference between the voltage of the capacitor and the maximum voltage of the battery module is less than a second preset voltage, the second contactor is controlled to be disconnected, and the sixth contactor and the seventh contactor are controlled to be closed.

[0106] Optionally, when the insulation detection output voltage of the charging pile is less than the first preset voltage and the type of the charging pile is a low-voltage pile, the first contactor and the second contactor are controlled to be closed.

[0107] When the voltage of the capacitor is a third preset voltage, the first contactor, the second contactor and the sixth contactor are controlled to be closed.

[0108] In one specific embodiment of the present disclosure, the driving system is multiplexed to serve as a voltage conversion module, so that the battery module of a new energy vehicle can be output after being stepped down, effectively solving the problem that the battery of a new energy vehicle in the prior art cannot be compatible with a low-voltage pile and can only be charged by a high-voltage pile. In addition, the voltage conversion module can also step up the output voltage of a low-voltage pile, effectively improving the charging efficiency of the low-voltage pile.

[0109] Reference will be made to the drawings below Figure 6 Please refer to Figure 6 , Figure 6is a structural schematic diagram of an electronic device suitable for implementing embodiments of the present application. It should be noted that Figure 6 The electronic device 600 shown is merely an example and should not bring any limitation to the functions and usage range of embodiments of the present application.

[0110] As shown in Figure 6 The electronic device 600 includes a central processing unit (CPU) 601, which can perform various appropriate actions and processes according to programs stored in a read-only memory (ROM) 602 or programs loaded from a storage portion 608 into a random access memory (RAM) 603, such as performing the methods in the above embodiments. Various programs and data required for system operation are also stored in the RAM 603. The CPU 601, the ROM 602, and the RAM 603 are connected to each other through a bus 604. An input / output (I / O) interface 605 is also connected to the bus 604.

[0111] The following components are connected to the I / O interface 605: an input portion 606 including a keyboard, a mouse, and the like; an output portion 607 including a cathode ray tube (CRT), a liquid crystal display (LCD), and the like, and a speaker, and the like; a storage portion 608 including a hard disk, and the like; and a communication portion 609 including a network interface card such as a LAN (Local Area Network) card, a modem, and the like. The communication portion 609 performs communication processing via a network such as the Internet. A drive 610 is also connected to the I / O interface 605 as necessary. A removable media 611 such as a magnetic disk, an optical disk, a magneto-optical disk, a semiconductor memory, and the like is mounted on the drive 610 as necessary, so that a computer program read therefrom is installed in the storage portion 608 as necessary.

[0112] In particular, according to embodiments of the present application, the processes described above with reference to the flowcharts can be implemented as a computer software program. For example, embodiments of the present application include a computer program product including a computer program carried on a computer-readable medium, the computer program containing a computer program for executing the methods shown in the flowcharts. In such embodiments, the computer program can be downloaded and installed from a network by the communication portion 609, and / or installed from the removable media 611. When the computer program is executed by the central processing unit (CPU) 601, various functions defined in the apparatus of the present application are performed.

[0113] It should be noted that the computer readable medium shown in the embodiments of the present application can be a computer readable signal medium or a computer readable storage medium or any combination of the two. The computer readable storage medium may, for example, be an electronic, magnetic, optical, electromagnetic, infrared or semiconductor system, device or apparatus, or any combination of the above. More specific examples of the computer readable storage medium can include, but are not limited to, an electrical connection having one or more wires, a portable computer diskette, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM), a flash memory, an optical fiber, a portable compact disk read-only memory (Compact Disc Read-Only Memory, CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In the present application, the computer readable signal medium can include a data signal carried in a baseband or as a part of a carrier wave, which carries the computer readable computer program. Such a propagated data signal can take various forms, including but not limited to an electromagnetic signal, an optical signal or any suitable combination thereof.

[0114] The units described in the embodiments of the present application can be implemented in the form of software, or can be implemented in the form of hardware, and the described units can also be arranged in a processor. In some cases, the names of these units do not constitute a limitation on the units themselves.

[0115] In other embodiments, the embodiments of the present application also provide a vehicle, which can include the above charging control device, or the above electronic device.

[0116] The above embodiments only illustrate the principles and effects of the present application, and are not used to limit the present application. Any person skilled in the art can modify or change the above embodiments without departing from the spirit and scope of the present application. Therefore, all equivalent modifications or changes made by those skilled in the art without departing from the spirit and technical idea of the present application should be covered by the claims of the present application.

Claims

1. A charging control method, characterized in that, include: The first voltage of the power battery in the target vehicle and the second voltage of the charging pile are obtained, wherein the second voltage is the maximum voltage value output by the charging pile; If the first voltage is greater than the second voltage, then a voltage reduction request value is determined based on a preset voltage reduction coefficient and the second voltage. The first voltage is then reduced based on the voltage reduction request value to determine the voltage drop of the power battery to a third voltage, and the third voltage is less than the second voltage. The preset voltage reduction coefficient is determined by the duty cycle. The charging pile is controlled to charge the target vehicle with the third voltage, and the third voltage is boosted to a fourth voltage, wherein the fourth voltage is less than the second voltage; wherein, if the charging pile detects that the voltage of the power battery is the third voltage, the target vehicle is charged according to the third voltage; then, a boost request value is determined according to a preset boost coefficient and the second voltage, and the third voltage is boosted according to the boost request value to determine that the current charging voltage is boosted to the fourth voltage, wherein the preset boost coefficient is associated with the complement of the initial duty cycle; The power battery is controlled to enter a boost charging state according to the fourth voltage until it is fully charged.

2. The charging control method according to claim 1, characterized in that, Also includes: The output voltage of the charging pile is determined to be a third voltage DC voltage; The DC power is boosted using a voltage converter, and the third voltage is boosted to a fourth voltage according to the boost request value to charge the power battery, so that the power battery enters a boost charging state until it is fully charged.

3. The charging control method according to any one of claims 1 to 2, characterized in that, If the first voltage is greater than the second voltage, the following steps are also included: Compare the first voltage of the power battery with the second voltage of the charging pile; If the first voltage is less than or equal to the second voltage, the target vehicle is charged using a direct charging method. If the first voltage is greater than the second voltage, it is expected that the target vehicle will be charged using a boost charging method.

4. The charging control method according to claim 1, characterized in that, The process of obtaining the first voltage of the power battery in the target vehicle and the second voltage of the charging pile includes: Send a charging request from the target vehicle to the charging pile; after determining the target vehicle based on the charging request, send an interaction request to the target vehicle; and in response to the feedback signal of the interaction request, obtain the first voltage of the power battery in the target vehicle and the second voltage of the charging pile.

5. The charging control method according to claim 1, characterized in that, Before controlling the power battery to enter the boost charging state according to the fourth voltage, the method further includes: Obtain the current first temperature value of the power battery; If the first temperature value is lower than and not within the preset temperature range, the power battery is heated until the first temperature value reaches the preset temperature, where the preset temperature is a lower temperature point within the preset temperature range. If the first temperature value is higher than and not within the preset temperature range, the power battery is cooled down until the first temperature value is cooled down to within the preset temperature range.

6. A charging control device, characterized in that, include: The acquisition module is used to acquire the first voltage of the power battery in the target vehicle and the second voltage of the charging pile, wherein the second voltage is the maximum voltage value output by the charging pile; A step-down module is used to determine a step-down request value based on a preset step-down coefficient and the second voltage if the first voltage is greater than the second voltage, and to step down the first voltage based on the step-down request value to determine the voltage drop of the power battery to a third voltage, wherein the third voltage is less than the second voltage, wherein the preset step-down coefficient is determined by the on-duty cycle; A boost module is used to control the charging pile to charge the target vehicle with the third voltage, and to boost the third voltage to a fourth voltage, wherein the fourth voltage is less than the second voltage; wherein, if the charging pile detects that the voltage of the power battery is the third voltage, it charges the target vehicle according to the third voltage; then, a boost request value is determined according to a preset boost coefficient and the second voltage, and the third voltage is boosted according to the boost request value to determine that the current charging voltage is boosted to the fourth voltage, wherein the preset boost coefficient is associated with the complement of the initial duty cycle; The charging control module is used to control the power battery to enter the boost charging state according to the fourth voltage until it is fully charged.

7. An electronic device, characterized in that, include: One or more processing devices; Memory, used to store one or more programs; When the one or more programs are executed by the one or more processing devices, the one or more processing devices implement the charging control method according to any one of claims 1 to 5.

8. A vehicle, characterized in that, This includes using the charging control device of claim 6, or the electronic device of claim 7.

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