Charging control method, charging control system and target vehicle

Abstract

The invention discloses a charging control method, a charging control system and a target vehicle, and the method comprises the steps: determining the first discharge capability of power supply equipment based on an electric signal if the electric signal accessed by a charging connection device of the power supply equipment is detected from a charging interface of the target vehicle; determining the target charging power of each power battery according to the first discharging capability and the real-time state parameters of the plurality of power batteries; and based on the target charging power, controlling a charging device of the target vehicle to charge a corresponding power battery. Therefore, charging power distribution is performed on each power battery through the first discharging capability of the power supply equipment and the real-time state parameter of each power battery, so that the target charging power obtained through distribution can adapt to the state of the power battery, and undercharge or overcharge of the power battery is avoided, thereby realizing equalizing charging of the plurality of power batteries, and improving the charging efficiency of the power battery. And the charging efficiency, the service life of the power battery and the operation efficiency of the target vehicle are improved.

Description

Technical Field

[0001] This application relates to the technical field of battery charging, and particularly to a charging control method, a charging control system, and a target vehicle. Background Art

[0003] In current new energy locomotive charging solutions, the power battery charging device in the traction converter cabinet is powered by an electric vehicle charging pile. There is little interaction between the charging pile and the power battery. The charging sequence and charging power distribution of multiple power batteries are random, resulting in uneven charging of the power battery pack, reducing the charging efficiency and the lifespan of the power battery. Moreover, the power battery capacity of new energy locomotives is generally large, and uneven charging will also lead to a long charging time for new energy locomotives, resulting in low operating efficiency of new energy locomotives. Summary of the Invention

[0004] Embodiments of this application provide a charging control method, a charging control system, and a target vehicle. This method can achieve balanced charging of multiple power batteries, improve the charging efficiency and the lifespan of the power battery, as well as the operating efficiency of the target vehicle.

[0005] The technical solution of this application is implemented as follows:

[0006] This application provides a charging control method, including:

[0007] If an electrical signal of the charging connection device of the power supply device is detected from the charging interface of the target vehicle, determine the first discharge capacity of the power supply device based on the electrical signal; the target vehicle includes multiple power batteries;

[0008] Determine the target charging power of each power battery according to the first discharge capacity and the real-time state parameters of the multiple power batteries;

[0009] Based on the target charging power, control the charging device of the target vehicle to charge the corresponding power battery.

[0010] This application provides a charging control system, including: a contactor, a signal detection circuit, a controller, and a charging device. The controller is respectively connected to the contactor, the signal detection circuit, and the charging device. The signal detection circuit, the contactor, and the charging device form a loop. Among them,

[0011] The signal detection circuit is configured to transmit the electrical signal to the controller when an electrical signal of the charging connection device of the power supply device is detected from the charging interface of the target vehicle; the target vehicle includes multiple power batteries;

[0012] The controller is configured to control the contactor corresponding to the charging interface to close based on the electrical signal, and determine the first discharge capacity of the power supply device based on the electrical signal; determine the target charging power of each power battery according to the first discharge capacity and the real-time state parameters of the multiple power batteries; and control the charging device to charge the corresponding power battery based on the target charging power.

[0013] The present application provides a vehicle, including the charging control system provided by the embodiments of the present application. The charging interfaces are disposed on opposite sides of the target vehicle, and multiple charging interfaces on the same side of the target vehicle correspond to one contactor. Description of the Drawings

[0014] Figure 1 It is a schematic flow chart of a charging control method provided by an embodiment of the present application;

[0015] Figure 2 It is a schematic structural diagram of a charging control system provided by an embodiment of the present application;

[0016] Figure 3 It is a schematic structural diagram of a multi-gun high-power adaptive charging system provided by an embodiment of the present application;

[0017] Figure 4 It is a schematic flow chart of a charging current matching method for a power battery provided by an embodiment of the present application;

[0018] Figure 5 It is a schematic flow chart of a control method for a multi-gun high-power adaptive charging system for a new energy shunting locomotive applicable to a closed scenario provided by an embodiment of the present application. Detailed Embodiments

[0019] In order to understand the features and technical content of the embodiments of the present application in more detail, the implementation of the embodiments of the present application will be described in detail below with reference to the accompanying drawings. The accompanying drawings are only for reference and explanation, and are not used to limit the embodiments of the present application.

[0020] Based on the problems in the related art, the present application provides a charging control method, which can be applied to new energy vehicles including multiple power batteries, such as new energy shunting locomotives, etc. As Figure 1 shown, the method includes:

[0021] S101. If an electrical signal indicating the access of the charging connection device of the power supply device is detected from the charging interface of the target vehicle, determine the first discharge capacity of the power supply device based on the electrical signal.

[0022] It should be noted that the target vehicle can be a new energy vehicle, such as a new energy shunting locomotive, a new energy vehicle, etc. The target vehicle includes multiple power batteries, the power supply device can be a charging pile for charging the target vehicle, etc., and the charging connection device can be a charging cable, a charging gun, etc. One end of the charging connection device is inserted into the connection interface of the power supply device, and the other end is inserted into the charging interface of the target vehicle to facilitate the power supply device to charge the target vehicle.

[0023] In some embodiments, the charging interface of the target vehicle may include one or more. Different charging interfaces can be inserted by different charging connection devices. Therefore, the number of inserted charging connection devices can be determined according to the number of detected electrical signals.

[0024] Among them, the electrical signal detected from the charging interface can be a voltage signal or a signal of voltage change. For example, if the corresponding voltage is 24V when the charging interface is not inserted with a charging connection device, and the corresponding voltage is 12V after inserting the charging connection device. Therefore, by judging whether the voltage of the charging interface changes, it can be determined whether a charging connection device is connected; or, there is no voltage signal when the charging interface is not inserted with a charging connection device, and a voltage signal appears after inserting the charging connection device. Therefore, it can be determined whether a charging connection device is connected by judging whether there is a voltage signal at the charging interface.

[0025] In some embodiments, the first discharge capacity can be the maximum discharge capacity or the maximum discharge power of the power supply device. In the case of determining the electrical signal that the charging connection device of the power supply device is connected to the charging interface of the target vehicle, the maximum discharge capacity of the connected power supply device can be determined.

[0026] S102. Determine the target charging power of each power battery according to the first discharge capacity and the real-time state parameters of the multiple power batteries.

[0027] It should be noted that the real-time state parameters can be the state parameters of the power battery collected when the electrical signal of the charging connection device accessing the charging interface is detected. The real-time state parameters of the power battery can include the temperature of the power battery, the remaining battery capacity (State of Charge, SOC), the voltage difference between battery cells, etc. Since the working states, discharge capacities, etc. of different power batteries may be different, the real-time state parameters of each power battery may also be different at the same moment or in the same time period.

[0028] In some embodiments, the charging power can be allocated to each power battery according to the first discharge capacity of the power supply device and the real-time state parameters of the power battery. For example, according to the real-time state parameters of each power battery, the charging power required by each power battery can be determined, and then combined with the first discharge capacity of the power supply device connected to the target vehicle, the charging power required by the power battery can be adjusted, so as to determine the target charging power of each power battery.

[0029] Here, the target charging powers corresponding to different power batteries may be exactly the same, partially the same, or completely different. For example, if the target vehicle includes power battery A, power battery B, and power battery C, the target charging power allocated to power battery A may be 100 kilowatts (kW), the target charging power allocated to power battery A may be 80 kilowatts (kW), and the target charging power allocated to power battery A may be 120 kilowatts (kW).

[0030] S103. Based on the target charging power, control the charging device of the target vehicle to charge the corresponding power battery.

[0031] In some embodiments, the charging device can be respectively connected to different power batteries, so the current and / or voltage of each output path of the charging device can be respectively controlled, so that different power batteries can obtain the target charging power corresponding to themselves.

[0032] In the embodiments of the present application, if an electrical signal of the charging connection device of the power supply device is detected from the charging interface of the target vehicle, the first discharge capacity of the power supply device is determined based on the electrical signal; according to the first discharge capacity and the real-time state parameters of multiple power batteries, the target charging power of each power battery is determined; based on the target charging power, control the charging device of the target vehicle to charge the corresponding power battery. In this way, by the first discharge capacity of the power supply device and the real-time state parameters of each power battery, the charging power is allocated to each power battery, which can make the obtained target charging power adapt to the state of the power battery itself, avoid undercharging or overcharging of the power battery, so as to realize balanced charging of multiple power batteries, improve the charging efficiency and the service life of the power battery, and the operating efficiency of the target vehicle.

[0033] In some embodiments of the present application, according to the first discharge capacity and the real-time state parameters of multiple power batteries, the target charging power of each power battery is determined, and the above step S102 can be implemented by the following steps S1021 to S1023. Each step is described separately below.

[0034] S1021. Determine the average charging current of multiple power batteries according to the first discharge capacity and the first DC bus voltage of the charging device.

[0035] Among them, the first DC bus voltage can be the voltage across the power supply of the charging device, and the first DC bus voltage can be the voltage matching the maximum discharge capacity of the power supply device obtained through a trial method.

[0036] In some embodiments, when the first discharge capacity is the maximum discharge power of the power supply device, the ratio of the maximum discharge power to the first DC bus voltage can be used as the average charging current of the multiple power batteries. The average charging current can be considered as the charging current initially allocated to each power battery.

[0037] S1022. Determine the target charging current corresponding to each power battery based on the real-time state parameters and the average charging current of the multiple power batteries.

[0038] In some embodiments, the average charging current can be adjusted based on the real-time state parameters of each power battery, so as to obtain the target charging current corresponding to each different power battery, and the target charging currents corresponding to different power batteries may be different.

[0039] S1023. Determine the target charging power of each power battery based on the target charging current.

[0040] In some embodiments, the target charging power corresponding to the power battery can be obtained based on the target charging current and the corresponding target charging voltage of the power battery.

[0041] It can be understood that by adjusting the average charging current of each power battery through the real-time state parameters of the power battery, the determined target charging current can be adapted to its own state parameters, thereby improving the rationality and accuracy of the target charging power determined based on the target charging current.

[0042] In some embodiments of the present application, in the process of determining the target charging current corresponding to each power battery based on the real-time state parameters and the average charging current of the multiple power batteries, the first reference charging power corresponding to each power battery can be determined based on the real-time state parameters of the multiple power batteries and the preset corresponding relationship between the state parameters and the charging power of the power battery; the second reference charging power of each power battery can be determined based on the average charging current and the first DC bus voltage; if the first reference charging power and the second reference charging power of a specific power battery are different, the current balance coefficient can be determined based on the difference between the first reference charging power and the second reference charging power; the target charging current corresponding to the specific power battery can be determined based on the current balance coefficient and the average charging current.

[0043] Among them, the preset correspondence between the state parameters of the power battery and the charging power can be a mapping relation table between the state parameters of the power battery and the charging power, and this mapping relation table is provided by the power battery manufacturer. For example, during the production of power batteries, in order to avoid undercharging or overcharging of the power batteries, the charging power matching the batteries in different operating states (corresponding to state parameters) is tested and recorded, so that a mapping relation table between the state parameters of the power battery and the charging power can be obtained.

[0044] In some embodiments, the real-time state parameters of the power battery can be matched with each state parameter in the mapping relation table, so as to determine the first reference charging power corresponding to each power battery.

[0045] In some embodiments, each power battery can be connected in parallel. Therefore, according to the first DC bus voltage and the average charging current, the second reference charging power pre-allocated to each power battery can be determined, and the second reference charging powers of each power battery are the same.

[0046] In some embodiments, a specific power battery can be any one of multiple power batteries. The first reference charging power and the second reference charging power of the specific power battery can be compared to determine whether the second reference charging power pre-allocated to the specific power battery exceeds the first reference charging power required by the specific battery, or whether the second reference charging power is much smaller than the first reference charging power required by the specific battery.

[0047] Here, the difference between the first reference charging power and the second reference charging power can be calculated, and based on this difference and the correspondence between the charging power difference and the current balance coefficient, the current balance coefficient for adjusting the average charging current can be determined. Among them, the correspondence between the charging power difference and the current balance coefficient can be established in advance, and the charging power difference and the current balance coefficient can have a linear relationship. The larger the charging power difference, the larger the current balance coefficient; conversely, the smaller the current balance coefficient.

[0048] In some embodiments, the average charging current can be updated based on the current balance coefficient, so as to determine the target charging current corresponding to the specific power battery; in other embodiments, if it is determined that the first reference charging current and the second reference charging current are the same, the average charging current can be directly determined as the target charging current of the specific power battery.

[0049] It can be understood that, by determining the current balance coefficient based on the difference between the first reference charging power required for the power battery determined according to the real-time state parameters of the power battery and the second reference charging power pre-allocated for the power battery, and updating the average charging current based on this current balance coefficient, the finally determined target charging current can be adapted to the current state of the power battery and the power supply capacity of the power supply device, preventing overcharging or undercharging of the power battery.

[0050] In some embodiments of the present application, the real-time state parameters include the remaining power. Based on this, the implementation manner of determining the target charging current corresponding to a specific power battery based on the current balance coefficient and the average charging current can be as follows: determining the average remaining power of multiple power batteries based on the remaining power of the multiple power batteries; determining the percentage of the remaining power of the specific power battery to the average remaining power; updating the average charging current based on the percentage and the current balance coefficient to obtain the first charging current; and determining the first charging current as the target charging current corresponding to the specific power battery.

[0051] Here, by calculating the percentage of the remaining power of the specific power battery to the average remaining power, the difference between the current SOC of the specific power battery and the average SOC can be determined. The greater the difference, the greater the required charging power; on the contrary, it indicates that the required charging power is smaller.

[0052] In some embodiments, in the process of updating the average charging current based on the percentage of the remaining power of the specific power battery to the average remaining power and the current balance coefficient to obtain the first charging current, the product of the percentage and the current balance coefficient can be calculated first. If the first reference charging power is greater than the second reference charging power, the difference between the average charging current and the product can be determined as the first charging current; if the first reference charging power is less than the second reference charging power, the sum of the average charging current and the product can be determined as the first charging current.

[0053] It can be understood that, by determining the percentage of the remaining power of the specific power battery to the average remaining power and updating the average charging current based on this percentage and the current balance coefficient, it can be ensured that during the charging process of the specific power battery based on the updated first charging current, the maximum discharge capacity of the power supply device will not be exceeded.

[0054] In some embodiments of the present application, the implementation manner of "determining the first discharge capacity of the power supply device based on the electrical signal" in step S101 may include: when an electrical signal is detected, obtaining the discharge voltage of the power supply device, as well as the current charging current and the current DC bus voltage of the charging device; if the current DC bus voltage is different from the discharge voltage, determining the absolute value of the difference between the current DC bus voltage and the discharge voltage; and determining the first discharge capacity of the power supply device based on the absolute value of the difference and the current charging current.

[0055] Wherein, the current charging current of the charging device may be a preset initial charging current, and this initial charging current may be a relatively small current value, such as 5 amperes (A), 8 A, etc.

[0056] In some embodiments, when it is determined that the discharge voltage of the power supply device may be greater than or less than the current DC bus voltage of the charging device, by calculating the absolute value of the difference between the discharge voltage of the power supply device and the current DC bus voltage of the charging device, the difference between the current DC bus voltage of the charging device and the discharge voltage of the power supply device can be further judged, and the first discharge capacity of the power supply device is determined according to the size of this difference and the current charging current.

[0057] In some embodiments of the present application, in the process of determining the first discharge capacity of the power supply device based on the absolute value of the difference and the current charging current, it can be judged whether the absolute value of the difference between the discharge voltage of the power supply device and the current DC bus voltage of the charging device is within a preset voltage range, and then it is determined whether it is necessary to adjust the initial charging current (current charging current), and finally the first discharge capacity of the power supply device is determined. Wherein, the preset voltage range can be any preset voltage range, such as [0, 5V], [0, 12V], etc.

[0058] In some embodiments, if it is determined that the absolute value of the difference between the discharge voltage of the power supply device and the current DC bus voltage of the charging device is within the preset voltage range, the first discharge capacity is determined based on the current DC bus voltage and the current charging current of the charging device.

[0059] Here, when the absolute value of the difference between the discharge voltage of the power supply device and the current DC bus voltage of the charging device is within the preset voltage range, it can be considered that the difference between the current DC bus voltage of the charging device and the discharge voltage of the power supply device is relatively small, and then the product of the current DC bus voltage and the current charging current of the charging device can be directly determined as the first discharge capacity.

[0060] In some other embodiments, if it is determined that the absolute value of the difference between the discharge voltage of the power supply device and the current DC bus voltage of the charging device is outside the preset voltage range, the current charging current is updated based on the absolute value of the difference to obtain a second charging current; the charging device is controlled to output the second charging current, and the second DC bus voltage corresponding to the charging device when outputting the second charging current is detected; if the absolute value of the difference between the second DC bus voltage and the discharge voltage is within the preset voltage range, the first discharge capacity is determined based on the second charging current and the second DC bus voltage.

[0061] Here, when the absolute value of the difference between the discharge voltage of the power supply device and the current DC bus voltage of the charging device is outside the preset voltage range, it can be considered that the difference between the current DC bus voltage of the charging device and the discharge voltage of the power supply device is relatively large. In this case, the correction amount for the current charging current can be determined according to the size of the absolute value of the difference (the larger the absolute value of the difference, the larger the corresponding correction amount), and the current charging current is updated based on this correction amount. By updating the current charging current, the maximum discharge capacity of the power supply device can be gradually explored, so that the maximum discharge capacity of the power supply device can be determined more quickly and accurately.

[0062] In some embodiments, if the discharge voltage is greater than the current DC bus voltage, the sum of the current charging current and the correction amount can be determined as the second charging current; if the discharge voltage is less than the current DC bus voltage, the difference between the current charging current and the correction amount can be determined as the second charging current.

[0063] In some embodiments, after controlling the charging device to output the second charging current and detecting the second DC bus voltage corresponding to the second charging current, it is also necessary to compare the second DC bus voltage with the discharge voltage of the power supply device. When it is determined that the absolute value of the difference between the second DC bus voltage and the discharge voltage is within the preset voltage range, the product of the second charging current and the second DC bus voltage can be determined as the first discharge capacity; on the contrary, when it is determined that the absolute value of the difference between the second DC bus voltage and the discharge voltage is outside the preset voltage range, the second charging current needs to be further updated until the absolute value of the difference between the detected DC bus voltage of the charging device after adjustment and the discharge voltage of the power supply device is within the preset voltage range, then the first discharge capacity of the power supply device can be determined.

[0064] It can be understood that by comparing the current DC bus voltage of the charging device with the discharge voltage of the power supply device, the absolute value of the difference between the current DC bus voltage and the discharge voltage is determined. Based on the relationship between the absolute value of the difference and the preset voltage range, the first discharge capacity of the power supply device can be quickly determined.

[0065] In some embodiments of the present application, the charging interfaces of the target vehicle include multiple ones, and each charging interface corresponds to a charging connection device and a power supply device. Based on this, if an electrical signal is detected from multiple charging interfaces, the sum of the discharge capabilities of the power supply devices corresponding to each power supply interface is determined; and the sum of the discharge capabilities is determined as the first discharge capability. That is to say, the discharge capability of the power supply device can be the sum of the maximum discharge capabilities of multiple connected power supply devices. When multiple power supply devices are connected to the charging interfaces of the target vehicle, multiple power batteries can obtain a greater charging power, thereby accelerating the charging speed.

[0066] In an embodiment of the present application, if an electrical signal indicating the connection of the charging connection device of the power supply device is detected from the charging interface of the target vehicle, the first discharge capability of the power supply device is determined based on the electrical signal; according to the first discharge capability and the real-time state parameters of multiple power batteries, the target charging power of each power battery is determined; and based on the target charging power, the charging device of the target vehicle is controlled to charge the corresponding power battery. In this way, by using the first discharge capability of the power supply device and the real-time state parameters of each power battery to allocate the charging power of each power battery, the obtained target charging power can be adapted to the state of the power battery itself, avoiding undercharging or overcharging of the power battery, thereby realizing balanced charging of multiple power batteries, improving the charging efficiency and the service life of the power battery, as well as the operating efficiency of the target vehicle.

[0067] The present application provides a charging control system, as Figure 2 shown. The charging control system 200 includes: a contactor 201, a signal detection circuit 202, a controller 203, and a charging device 204. The controller 203 is respectively connected to the contactor 201, the signal detection circuit 202, and the charging device 204, and the signal detection circuit 202, the contactor 201, and the charging device 204 form a loop.

[0068] In some embodiments, the signal detection circuit 202 is configured to transmit the electrical signal to the controller 203 when an electrical signal indicating the connection of the charging connection device of the power supply device is detected from the charging interface of the target vehicle, where the target vehicle includes multiple power batteries.

[0069] In some embodiments, the controller 203 is configured to control the contactor 202 corresponding to the charging interface to close based on the electrical signal, and determine the first discharge capability of the power supply device based on the electrical signal; according to the first discharge capability and the real-time state parameters of multiple power batteries, determine the target charging power of each power battery; and based on the target charging power, control the charging device 204 to charge the corresponding power battery.

[0070] Among them, different charging interfaces can correspond to different contactors 201. When the controller 203 detects an electrical signal indicating that the charging connection device is inserted into some of the multiple charging interfaces, it can control the contactors 201 corresponding to the corresponding charging interfaces to close, while the contactors 201 corresponding to other charging interfaces remain open, thereby preventing people in the target vehicle or target vehicle accessories from getting an electric shock.

[0071] In some embodiments, the signal detection circuit 202 may include a power supply module and a plurality of parallel voltage detection circuits. Among them, the power supply module can supply power to the voltage detection circuit, and the voltage detection circuit can detect the voltage signal of the charging interface.

[0072] In some embodiments, each voltage detection circuit corresponds to a charging interface. The positive pole of the voltage detection circuit is connected to the positive pole of the corresponding charging interface, and the negative pole of the voltage detection circuit is connected to the negative pole of the corresponding charging interface.

[0073] In some embodiments, the voltage detection circuit includes a voltage dividing resistor and a voltage sensor connected in series. When the charging connection device of the power supply device is inserted into the charging interface, the voltage dividing resistor can divide the voltage, so that the voltage in the voltage detection circuit changes, and the voltage sensor can detect the signal of this voltage change.

[0074] Next, the implementation process of the application embodiment in the actual application scenario will be introduced.

[0075] As Figure 3 shown, it is a schematic structural diagram of a multi-gun high-power adaptive charging system provided by the present application. The multi-gun high-power adaptive charging system includes contactors 301 (KMA1-1, KMA1-2, KMB1-1, KMB1-2), a signal detection circuit 302, and a charging device 303. This system can charge four power batteries.

[0076] Among them, the signal detection circuit 302 includes four parallel voltage detection circuits. Each voltage detection circuit is composed of a voltage dividing resistor BR2 and a voltage sensor BPT2, a voltage dividing resistor BR3 and a voltage sensor BPT3, a voltage dividing resistor BR4 and a voltage sensor BPT4, and a voltage dividing resistor BR5 and a voltage sensor BPT5. The two ends of the voltage sensor BPT2 are respectively connected to the A-side charging interfaces DMA1+ and DMA1-; the two ends of the voltage sensor BPT3 are respectively connected to the A-side charging interfaces DMA2+ and DMA2-; the two ends of the voltage sensor BPT4 are respectively connected to the B-side charging interfaces DMB1+ and DMB1-; the two ends of the voltage sensor BPT4 are respectively connected to the B-side charging interfaces DMB2+ and DMB2-.

[0077] When it is detected that the charging gun is plugged into the charging interface DMA1+, DMA1- and / or DMA2+, DMA2- on the A side, the contactors KMA1-1 and KMA1-2 can be controlled to close, and KMB1-1 and KMB1-2 to open; or when it is detected that the charging gun is plugged into the charging interface DMB1+, DMB1- and / or DMB2+, DMB2- on the B side, the contactors KMB1-1 and KMB1-2 can be controlled to close, and KMA1-1 and KMA1-2 to open.

[0078] The signal detection circuit 302 includes a power supply module auxiliary module, BC1, BC2, etc. The auxiliary module can output the supply voltage of the signal detection circuit 302. BC1 provides a DC110V power supply for the charging device control system; BC2 can provide the power supply required for the charging gun signal to identify whether the charging gun is inserted into the charging interface.

[0079] The multi-gun high-power adaptive charging system provided by the embodiments of the present application adopts a topology scheme structure with 4 guns that can be independently charged, with two charging gun interfaces on each side of the locomotive. According to different powers and the positions of the ground charging piles, different charging gun positions can be connected. After the charging gun is plugged in, the locomotive traction converter cabinet automatically identifies the number and position of the connected charging guns, automatically completes the data interaction of the charging guns, and completes the high-power and high-efficiency charging of the power battery.

[0080] As Figure 4 shown, it is a schematic flowchart of a method for matching the charging current of a power battery provided by the embodiments of the present application. This method can be applied to Figure 3 the multi-gun high-power adaptive charging system shown. This method includes:

[0081] S401. Determine whether the voltage of the charging interface on the A side is 12V.

[0082] If yes, execute the following step S402; otherwise, execute the following steps S403 to S408.

[0083] S402. Control the contactor on the A side to close.

[0084] S403. Determine whether the voltage of the charging interface on the B side is 12V.

[0085] If yes, execute the following steps S404 to S408; otherwise, end the process.

[0086] S404. Control the contactor on the A side to close.

[0087] S405. Set the initial charging current I1.

[0088] S406. Determine whether the change in the DC bus voltage of the charging device exceeds the preset voltage range.

[0089] If so, execute the following step S407; otherwise, execute the following step S409.

[0090] S407. Increase or decrease ΔI based on I1 to obtain a new charging current.

[0091] After step S407, it is possible to return to step S406 to continue execution.

[0092] S408. Charge the power battery based on the initial charging current I2.

[0093] In the embodiments of the present application, by adjusting the charging current, automatic matching of the charging power can be achieved. By adopting the control method of automatic power matching, after the charging gun of the ground charging pile is plugged in, the system will gradually increase the charging power according to the system state through the control algorithm, so that the charging power of the power battery quickly matches the power of the ground charging pile. It can avoid the complex logic control caused by different numbers of inserted charging guns, and prevent problems such as charging failure or long charging duration due to too large or too small charging power.

[0094] As Figure 5 shown, it is a schematic flowchart of a control method for an adaptive charging system with multiple guns and high power for a new energy shunting locomotive applicable to a closed scenario provided by the present application. This adaptive charging system control method is applicable to new energy shunting locomotives in a closed scenario, which can ensure the reliability and stability of high-power power supply for the locomotive power battery, shorten the charging time of the new energy locomotive, extend the life of the new energy power battery, and improve the operation efficiency of the locomotive. The method includes:

[0095] S501. Obtain the state parameters of the power battery and the state parameters of the charging device.

[0096] Among them, the state of the power battery may include the temperature, SOC, power supply contactor state, power supply fuse state, and cell voltage difference of the power battery; the state of the charging device may include the module temperature of the charging device, loop contactor state, and cooling system state.

[0097] S502. When it is determined that the states of both the power battery and the charging device are normal, determine the average SOC according to the SOC of each power battery.

[0098] It is possible to determine whether the power battery and the charging device are in a normal state according to the state parameters of the power battery and the state parameters of the charging device obtained in step S501. By calculating the sum of the SOCs of each power battery and based on this SOC sum and the number of power batteries, the average SOC is determined.

[0099] S503. Determine the ratio n of the SOC of each power battery to the average SOC, and determine the current balancing coefficient K based on the system state.

[0100] Here, the system state may be the matching situation among the maximum discharge capacity of the charging pile, the capacity of the on-vehicle charging device, and the charging power demand of the power battery. The current balancing coefficient K may have an initial value. For the initial K, if the capacity allocated to this path of batteries exceeds the capacity of the charging pile, the corresponding K for this path will be reduced. If the allocated charging currents all meet the requirements, there is no need to correct K; otherwise, K needs to be corrected to reallocate the charging power. K can be determined by the matching relationship between the charging power of the charging battery and the charging pile, and the SOC of the battery itself.

[0101] S504. Determine the charging current allocated to each power battery based on the ratio n, the current balancing coefficient K, and the average charging current, and perform charging control on each power battery based on the charging current allocated to the power battery.

[0102] Here, if the average charging current is represented by I2, when the charging power pre-allocated to the power battery is greater than the actual required charging power of the power battery, I2 - n*K can be used as the charging current of the power battery; otherwise, when the charging power pre-allocated to the power battery is less than the actual required charging power of the power battery, I2 + n*K can be used as the charging current of the power battery.

[0103] In the embodiment of the present application, after detecting the states such as the SOC, battery temperature, and voltage difference of battery cells of multiple power batteries, according to the different states of each group of batteries, the charging device outputs different powers to different batteries based on the internal processing algorithm, avoiding overcharging of batteries with poor states and undercharging of batteries with good states due to charging with the same power, and ensuring the equal charging effect of all batteries, avoiding the situation that batteries with more remaining capacity are fully charged prematurely and waiting for a long time, resulting in an overly long overall charging time.

[0104] The embodiment of the present application further provides a target vehicle, where the target vehicle includes the charging control system provided by the embodiment of the present application, the charging interfaces are arranged on opposite sides of the target vehicle, and multiple charging interfaces on the same side of the target vehicle correspond to one contactor.

[0105] Since the target vehicle includes multiple charging interfaces, multiple power supply devices can be connected through the multiple charging interfaces, thereby improving the charging efficiency of the power battery. The charging interfaces are arranged on opposite sides of the target vehicle. Protection is provided by sharing one contactor for the two charging interfaces on each side of the target vehicle. This avoids the situation where when charging on one side, the other side is electrified at the charging interface, causing casualties. Additionally, the ground charging pile can be protected during the charging process to prevent the expansion of faults in case of short circuits, grounding, etc.

[0106] It should be noted that in this document, the term "including" or any other variant thereof is intended to cover non-exclusive inclusion, such that a process, method, device, or system that includes a series of elements includes not only those elements but also other elements not explicitly listed, or elements that are inherent to such a process, method, device, or system. Without further limitations, an element defined by the statement "including at least one..." does not exclude the presence of additional identical elements in the process, method, device, or system that includes the element.

[0107] In several embodiments provided in this application, it should be understood that the disclosed methods and systems can be implemented in other ways. The system embodiments described above are merely illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined, or integrated into another system, or some features can be ignored, or not executed. Additionally, the coupling, direct coupling, or communication connection between the various components shown or discussed can be through some interfaces, and the indirect coupling or communication connection of devices or units can be electrical, mechanical, or other forms.

[0108] The above is only the implementation manner of this application, but the protection scope of this application is not limited thereto. Any technical person familiar with this technical field can easily think of changes or substitutions within the technical scope disclosed in this application, and all should be covered within the protection scope of this application.

Claims

1. A charging control method, characterized in that, Including: If an electrical signal indicating the access of the charging connection device of the power supply device is detected from the charging interface of the target vehicle, determine the first discharge capacity of the power supply device based on the electrical signal; The target vehicle includes multiple power batteries; According to the first discharge capacity and the real-time state parameters of the multiple power batteries, determine the target charging power of each power battery; Based on the target charging power, control the charging device of the target vehicle to charge the corresponding power battery.

2. The method according to claim 1, characterized in that, The step of determining the target charging power of each power battery according to the first discharge capacity and the real-time state parameters of the multiple power batteries includes: Determine the average charging current of the multiple power batteries according to the first discharge capacity and the first DC bus voltage of the charging device; Based on the real-time state parameters of the multiple power batteries and the average charging current, determine the target charging current corresponding to each power battery; Based on the target charging current, determine the target charging power of each power battery.

3. The method according to claim 2, wherein The step of determining the target charging current corresponding to each power battery based on the real-time state parameters of the multiple power batteries and the average charging current includes: Based on the real-time state parameters of the multiple power batteries and the preset correspondence between the state parameters and the charging power of the power battery, determine the first reference charging power corresponding to each power battery; Based on the average charging current and the first DC bus voltage, determine the second reference charging power of each power battery; If the first reference charging power and the second reference charging power of a specific power battery are different, determine a current balance coefficient based on the difference between the first reference charging power and the second reference charging power; the specific power battery is any one of the multiple power batteries; Based on the current balance coefficient and the average charging current, determine the target charging current corresponding to the specific power battery.

4. The method according to claim 3, characterized in that, The real-time state parameter includes the remaining power; the step of determining the target charging current corresponding to the specific power battery based on the current balance coefficient and the average charging current includes: Based on the remaining power of the multiple power batteries, determine the average remaining power of the multiple power batteries; Determine the percentage of the remaining power of the specific power battery to the average remaining power; Based on the percentage and the current balance coefficient, update the average charging current to obtain a first charging current; Determine the first charging current as the target charging current corresponding to the specific power battery.

5. The method according to claim 1, characterized in that The step of determining the first discharge capacity of the power supply device based on the electrical signal includes: When the electrical signal is detected, obtain the discharge voltage of the power supply device, as well as the current charging current and the current DC bus voltage of the charging device; If the current DC bus voltage is different from the discharge voltage, determine the absolute value of the difference between the current DC bus voltage and the discharge voltage; Based on the absolute value of the difference and the current charging current, determine the first discharge capacity of the power supply device.

6. The method according to claim 5, wherein Determining the first discharge capacity of the power supply device based on the absolute value of the difference and the current charging current includes: If the absolute value of the difference is within a preset voltage range, determine the first discharge capacity based on the current DC bus voltage and the current charging current of the charging device.

7. The method according to claim 5, wherein Determining the first discharge capacity of the power supply device based on the absolute value of the difference and the current charging current includes: If the absolute value of the difference is outside the preset voltage range, update the current charging current based on the absolute value of the difference to obtain a second charging current; Control the charging device to output the second charging current, and detect the second DC bus voltage corresponding to the charging device when outputting the second charging current; If the absolute value of the difference between the second DC bus voltage and the discharge voltage is within the preset voltage range, determine the first discharge capacity based on the second charging current and the second DC bus voltage.

8. The method according to claim 1, characterized in that, There are multiple charging interfaces, and each charging interface corresponds to a charging connection device and a power supply device; the method further includes: If the electrical signal is detected from the multiple charging interfaces, determine the sum of the discharge capacities of the power supply devices corresponding to the respective power supply interfaces; Determine the sum of the discharge capacities as the first discharge capacity.

9. A charging control system, characterized in that, Includes: A contactor, a signal detection circuit, a controller, and a charging device. The controller is respectively connected to the contactor, the signal detection circuit, and the charging device. The signal detection circuit, the contactor, and the charging device form a loop, where The signal detection circuit is configured to transmit the electrical signal to the controller when an electrical signal of the charging connection device of the power supply device is detected from the charging interface of the target vehicle; the target vehicle includes multiple power batteries; The controller is configured to control the contactor corresponding to the charging interface to close based on the electrical signal, and determine the first discharge capacity of the power supply device based on the electrical signal; determine the target charging power of each power battery according to the first discharge capacity and the real-time state parameters of the multiple power batteries; control the charging device to charge the corresponding power battery based on the target charging power.

10. The system according to claim 9, wherein, The signal detection circuit includes a power supply module and multiple parallel voltage detection circuits; the power supply module supplies power to the voltage detection circuits.

11. The system according to claim 10, wherein, Each voltage detection circuit corresponds to a charging interface. The positive electrode of the voltage detection circuit is connected to the positive electrode of the corresponding charging interface, and the negative electrode of the voltage detection circuit is connected to the negative electrode of the corresponding charging interface.

12. The system according to claim 10, wherein The voltage detection circuit includes a voltage-dividing resistor and a voltage sensor connected in series.

13. A target vehicle, characterized in that, Including the charging control system according to any one of claims 9 to 12, where the charging interfaces are arranged on opposite sides of the target vehicle, and multiple charging interfaces on the same side of the target vehicle correspond to one contactor.

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