Charging system, charging control method and device for power battery

Abstract

The application relates to a charging system, a charging control method and a device of a power battery, wherein charging scene information is acquired, the charging scene information at least including the number of direct-current charging interfaces connected with charging guns; a target charging mode is determined according to the charging scene information; based on the target charging mode, a switch unit inside a charging power distribution module is controlled to be turned on or turned off, so as to construct an energy transmission link corresponding to the target charging mode, and the working state of each voltage-lifting and voltage-lowering module is controlled, so as to adjust the voltage and current in the energy transmission path and charge each power battery module. The application supports multiple charging modes, realizes voltage matching and power distribution through the voltage-lifting and voltage-lowering modules, avoids the charging bottleneck caused by the voltage limitation of charging piles, enables the power battery system of a high-voltage platform to normally charge on a charging pile with low-voltage output, greatly improves the charging compatibility and practicability, and further can adapt to different charging pile configurations and use scenes.

Description

Technical Field

[0001] This application relates to the field of intelligent charging technology, and in particular to a charging system, charging control method and device for a power battery. Background Technology

[0002] In the aviation field, especially in electric vertical takeoff and landing (eVTOL) aircraft, extremely high requirements are placed on the safety of power battery systems. To ensure that the system can still operate safely in the event of a single point of failure, a redundant power battery system design is usually adopted, that is, two or more independent power battery modules are set up.

[0003] However, under current technology, the aviation industry has increasingly higher requirements for the discharge rate of power batteries, and the power battery system needs to be designed as a high-voltage platform; but the current charging pile specifications on the market are complicated, and most do not support high output voltage, which limits the charging matching of aviation power batteries with high-voltage platforms. Summary of the Invention

[0004] This application provides a charging system, charging control method, and device for a power battery, in order to solve the technical problem that existing aviation power battery systems with multiple battery modules cannot simultaneously meet the requirements of redundancy backup and charging usage, resulting in low charging efficiency and poor charging adaptability.

[0005] In a first aspect, this application provides a charging system for a power battery, the system comprising: At least two power battery modules, each of which has a charging circuit; At least two DC charging interfaces, each of which is connected to a charging circuit of one of the power battery modules; Multiple buck-boost modules are provided, with each power battery module connected to at least one buck-boost module. In addition, a charging power distribution module is connected to each of the DC charging interfaces and each of the buck-boost modules, respectively; The charging power distribution module is configured to connect or disconnect each connection path through its internal switching unit to reconstruct the energy transmission path between the DC charging interface, the buck-boost module and the power battery module.

[0006] In one possible implementation, the charging power distribution module includes a capacitor and a plurality of switching relays; The plurality of switching relays are configured to control the connection path between the charging power distribution module and each of the DC charging interfaces and each of the buck-boost modules by turning them on or off. The capacitor is configured to provide voltage support and energy buffering when the buck-boost module is in operation.

[0007] In one possible implementation, the buck-boost module reuses the three-phase windings and three-phase bridge arm circuit of the drive motor; The three-phase windings of the drive motor are used as inductors in the buck-boost module. The three-phase bridge arm circuit of the drive motor is used as the switching transistor architecture in the buck-boost module.

[0008] In one possible implementation, at least one of the power battery modules is connected in parallel to multiple of the buck-boost modules.

[0009] In one possible implementation, the charging power distribution module includes a plurality of switching relays configured to connect to each of the buck-boost modules respectively, and to disconnect the electrical connection between the charging power distribution module and the buck-boost modules in the absence of buck charging operation.

[0010] In one possible implementation, the system is configured to perform a single-gun, single-charger mode; wherein: Only one of the aforementioned DC charging interfaces is connected to the charging gun; Close the charging relay in the charging circuit of the power battery module corresponding to the DC charging interface connected to the charging gun, so that the DC charging interface directly charges the power battery module; The switching unit inside the charging power distribution module remains in the off state, and each of the buck-boost modules is in a non-operating state.

[0011] In one possible implementation, the system is configured to perform a single-gun dual-charging mode; wherein: Only one of the aforementioned DC charging interfaces is connected to the charging gun; Close the charging relay in the charging circuit of the first power battery module corresponding to the DC charging interface connected to the charging gun, so that the DC charging interface connected to the charging gun charges the first power battery module through the corresponding charging circuit. In addition, the charging power distribution module turns on the first path to enable the buck-boost module serving the second power battery module to work, so as to convert the voltage of the DC charging interface connected to the charging gun into a charging voltage that matches the second power battery module and then charge the second power battery module. There is no direct parallel connection between the first power battery module and the second power battery module.

[0012] In one possible implementation, the system is configured to perform a dual-gun boost charging mode, wherein: Connect the two DC charging ports to the charging gun respectively; The charging power distribution module connects the second path and the third path, so that the first DC charging interface and the second DC charging interface connected to the charging gun charge the first power battery module and the second power battery module respectively. When the output voltage of the charging pile is lower than the charging voltage required by the power battery module, the buck-boost module corresponding to the power battery module is configured to perform a boost operation to increase the output voltage of the charging pile and charge the corresponding power battery module.

[0013] In one possible implementation, the system is configured in a dual-gun independent DC charging mode, wherein: Connect the two DC charging ports to the charging gun respectively; When the output voltage of the charging pile meets the charging voltage requirements of the corresponding power battery module, the power battery module closes the charging positive relay and charging negative relay in its charging circuit, so that each DC charging interface directly charges each power battery module. The switching unit inside the charging power distribution module remains in the off state, so that the charging paths of the two DC charging interfaces are independent of each other.

[0014] Secondly, this application provides a charging control method for a charging system of a power battery as described in any one of the first aspects, the method comprising: Obtain charging scenario information, which includes at least the number of DC charging interfaces connected to the charging gun; Based on the charging scenario information, determine the target charging mode; Based on the target charging mode, the switching unit inside the charging power distribution module is controlled to be turned on or off to construct an energy transmission link corresponding to the target charging mode, and the working state of each of the buck-boost modules is controlled to adjust the voltage and current in the energy transmission path to charge each of the power battery modules.

[0015] In one possible implementation, the target charging mode includes a single-gun single-charge mode; controlling the switching unit inside the charging power distribution module and the operating state of each of the buck-boost modules based on the target charging mode includes: The power battery module corresponding to the DC charging interface connected to the charging gun closes the charging relay in its charging circuit, so that the DC charging interface directly charges the power battery module. The switching unit inside the charging power distribution module remains in the off state, and each of the buck-boost modules is in a non-operating state.

[0016] In one possible implementation, the target charging mode includes a single-gun dual-charging mode; controlling the switching unit inside the charging power distribution module and the operating state of each of the buck-boost modules based on the target charging mode includes: The first power battery module corresponding to the DC charging interface connected to the charging gun is controlled to close the charging relay in its charging circuit, so that the DC charging interface connected to the charging gun can directly charge the first power battery module through the corresponding charging circuit. The charging power distribution module is controlled to conduct the first path, so that the buck-boost module serving the second power battery module can work, so as to convert the voltage of the DC charging interface connected to the charging gun into a charging voltage that matches the second power battery module and then charge the second power battery module. There is no direct parallel connection between the first power battery module and the second power battery module.

[0017] In one possible implementation, the target charging mode includes a dual-gun boost charging mode; controlling the switching unit inside the charging power distribution module and the operating state of each of the boost / buck modules based on the target charging mode includes: The charging power distribution module is controlled to turn on the second and third paths, so that the first DC charging interface and the second DC charging interface connected to the charging gun charge the first power battery module and the second power battery module respectively. Furthermore, when the output voltage of the charging pile is lower than the charging voltage required by the power battery module, the buck-boost module corresponding to the power battery module is controlled to perform a boost operation to increase the output voltage of the charging pile and charge the power battery module.

[0018] In one possible implementation, the target charging mode includes a dual-gun independent DC charging mode; controlling the switching unit inside the charging power distribution module and the operating state of each of the buck-boost modules based on the target charging mode includes: When the output voltage of the charging pile meets the charging voltage requirements of the corresponding power battery module, the power battery module is controlled to close the charging positive relay and charging negative relay in its charging circuit, so that each DC charging interface directly charges each power battery module. The switching unit inside the charging power distribution module remains in the off state, so that the charging paths of the two DC charging interfaces are independent of each other.

[0019] Thirdly, this application provides a charging control device for a charging system of a power battery as described in any one of the first aspects, the device comprising: A charging scenario information acquisition module is used to acquire charging scenario information, which includes at least the number of DC charging interfaces connected to the charging gun. The target charging mode determination module is used to determine the target charging mode based on the charging scenario information. The charging mode activation module is used to control the switching unit inside the charging power distribution module to be turned on or off based on the target charging mode, so as to construct an energy transmission link corresponding to the target charging mode, and to control the working state of each of the buck-boost modules to adjust the voltage and current in the energy transmission path to charge each of the power battery modules.

[0020] In one possible implementation, the target charging mode includes a single-gun single-charger mode; the charging mode activation module is specifically used for: The power battery module corresponding to the DC charging interface connected to the charging gun closes the charging relay in its charging circuit, so that the DC charging interface directly charges the power battery module. The switching unit inside the charging power distribution module remains in the off state, and each of the buck-boost modules is in a non-operating state.

[0021] In one possible implementation, the target charging mode includes a single-gun dual-charging mode; the charging mode activation module is specifically used for: The first power battery module corresponding to the DC charging interface connected to the charging gun is controlled to close the charging positive relay in its charging circuit, so that the DC charging interface connected to the charging gun can directly charge the first power battery module through the corresponding charging circuit. The charging power distribution module is controlled to conduct the first path, so that the buck-boost module serving the second power battery module can work, so as to convert the voltage of the DC charging interface connected to the charging gun into a charging voltage that matches the second power battery module and then charge the second power battery module. There is no direct parallel connection between the first power battery module and the second power battery module.

[0022] In one possible implementation, the target charging mode includes a dual-gun boost charging mode; the charging mode activation module is specifically configured to include: The charging power distribution module is controlled to turn on the second and third paths, so that the first DC charging interface and the second DC charging interface connected to the charging gun charge the first power battery module and the second power battery module respectively. Furthermore, when the output voltage of the charging pile is lower than the charging voltage required by the power battery module, the buck-boost module corresponding to the power battery module is controlled to perform a boost operation to increase the output voltage of the charging pile and charge the power battery module.

[0023] In one possible implementation, the target charging mode includes a dual-gun independent DC charging mode; the charging mode activation module is specifically used for: When the output voltage of the charging pile meets the charging voltage requirements of the corresponding power battery module, the power battery module is controlled to close the charging positive relay and charging negative relay in its charging circuit, so that each DC charging interface directly charges each power battery module. The switching unit inside the charging power distribution module remains in the off state, so that the charging paths of the two DC charging interfaces are independent of each other.

[0024] Fourthly, this application provides an electronic device, including: a processor and a memory, wherein the processor is configured to execute a charging control program for a power battery charging system stored in the memory, so as to implement the charging control method for the power battery charging system as described in any one of the second aspects.

[0025] Fourthly, this application provides a storage medium storing one or more programs that can be executed by one or more processors to implement the charging control method of the power battery charging system described in any one aspect.

[0026] Compared with the prior art, the technical solution provided in this application has the following advantages: The charging control method corresponding to the charging system provided in this application acquires charging scenario information, which includes at least the number of DC charging interfaces connected to the charging gun; determines the target charging mode based on the charging scenario information; controls the switching unit inside the charging power distribution module to be turned on or off based on the target charging mode, so as to construct an energy transmission link corresponding to the target charging mode, and controls the working state of each buck-boost module to adjust the voltage and current in the energy transmission path to charge each power battery module. It supports multiple modes such as single-gun single charging, dual-gun independent charging, dual-gun boost charging, and dual-gun DC charging. Voltage matching and power distribution are achieved through buck-boost modules, avoiding charging bottlenecks caused by charging pile voltage limitations; thus, it can adapt to different charging pile configurations and usage scenarios. Furthermore, the buck-boost module supports boost charging, enabling high-voltage platform power battery systems to be charged normally on low-voltage output charging piles, greatly improving charging compatibility and practicality. Attached Figure Description

[0027] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0028] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0030] Figure 1 A schematic diagram of a charging system structure for a power battery provided in an embodiment of this application; Figure 2 A circuit diagram of a power battery system provided in an embodiment of this application; Figure 3 This application provides a schematic diagram of the current flow structure in a single-gun dual-charging mode. Figure 4 A circuit diagram of another power battery system provided in an embodiment of this application; Figure 5 A flowchart illustrating an embodiment of a charging control method for a power battery charging system provided in this application. Figure 6 A structural block diagram of a charging control device for a power battery charging system provided in an embodiment of this application; Figure 7 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0032] The following disclosure provides numerous different embodiments or examples for implementing various structures of this application. To simplify the disclosure, specific examples and arrangements are described below. These are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed.

[0033] To address the technical problem of low charging efficiency and poor charging adaptability caused by the inability of existing multi-module aviation power battery systems to simultaneously meet redundancy and charging requirements, this application provides a power battery charging system, charging control method, and device. This system supports multiple modes, including single-gun single-charge, dual-gun independent charging, dual-gun boost charging, and dual-gun DC charging. Voltage matching and power distribution are achieved through a buck-boost module, avoiding charging bottlenecks caused by charging pile voltage limitations. This allows for adaptation to different charging pile configurations and usage scenarios. Furthermore, the buck-boost module supports boost charging, enabling high-voltage platform power battery systems to charge normally on low-voltage output charging piles, significantly improving charging compatibility and practicality.

[0034] Figure 1 This is a schematic diagram of the system structure of a power battery charging system, charging control method and device provided in an embodiment of this application. The system includes: at least two power battery modules 5, each power battery module 5 having a charging circuit; at least two DC charging interfaces, each DC charging interface being connected to a charging circuit of a power battery module 5; multiple step-up and step-down modules 3, each power battery module 5 being connected to at least one step-up and step-down module 3; and a charging power distribution module 4, which is connected to each DC charging interface and each step-up and step-down module 3 respectively; a charging pile 1 and a charging pile 2.

[0035] The power battery system 6 consists of two power battery modules 5 and a charging power distribution module 4.

[0036] The charging power distribution module 4 is configured to connect or disconnect each connection path through its internal switching unit to reconstruct the energy transmission path between the DC charging interface, the buck-boost module 3 and the power battery module 5.

[0037] The aforementioned power battery module 5 includes: a power battery module; a relay for controlling the connection between the power battery module and the discharge load, and the connection between the charging circuit and the DC charging interface; and a pre-charge circuit including a pre-charge relay and a pre-charge resistor for pre-charging the power battery module before the main positive relay is closed.

[0038] For details, see Figure 2The diagram shown is a structural schematic of a power battery system. Figure 2 The system includes power battery module 1 and power battery module 2, buck-boost module 1 and buck-boost module 2, and a charging power distribution module. It should be noted that this application does not limit the number of power battery modules and buck-boost modules. One power battery module can be connected to one or more buck-boost modules. This explanation only uses one power battery module corresponding to one buck-boost module as an example, and this application does not impose any limitations on this.

[0039] Taking power battery module 1 as an example, power battery module 1 includes the following components: power battery module 1, pre-charge circuit relay K1-3, pre-charge resistor R1-1, main circuit main positive relay K1-2, main negative relay K1-1, fuse, current sensor, and charging circuit charging relays K1-6 and K1-5; wherein the charging circuit charging relays include charging positive relay K1-6 and charging negative relay K1-5. Each module is an independent charging and discharging unit with complete control, protection, and detection functions, realizing physical redundancy of the aviation power battery system. Even if one power battery module fails due to insufficient power or other problems, other power battery modules can still provide sufficient flight power for the equipment, meeting the safety requirement in the aviation field that a single point of failure does not affect the core function of the system.

[0040] Taking buck-boost module 1 as an example, the buck-boost module includes the following components: 6 switching transistors (Q1-1 to Q1-6), 3 inductors (L1-1 to L1-3), and capacitor C1-1. Further, in one embodiment, the buck-boost module can optionally reuse the three-phase windings and three-phase bridge arms of the drive motor to construct the hardware architecture, realizing the buck-boost function. The three phases of the motor are used as inductors in the buck-boost module; the three-phase bridge arm architecture of the motor is used as switching transistors. The buck-boost module directly reuses the architecture of the drive motor, eliminating the need for separate buck-boost hardware design. This enables multi-purpose functionality, significantly saving hardware costs and installation space, and meeting the stringent requirements of aerospace equipment regarding size, weight, and cost. It also reduces the number of system hardware components and improves overall reliability.

[0041] Specifically, the core working principle of the buck-boost module is to control the upper bridge arm (Q1-1, Q1-3, Q1-5) and lower bridge arm (Q1-2, Q1-4, Q1-6) of the switching transistors by periodically switching them on and off, thereby realizing the charging and discharging cycle of the inductor and thus completing the voltage boosting and boosting regulation; the capacitor C1-1 provides voltage support and filtering for the circuit, ensuring the stability of the output voltage; the inductor is the core of energy storage and conversion, realizing the temporary storage and transfer of electrical energy during the switching process of the switching transistors.

[0042] In addition, the buck-boost module can also be configured to not reuse the three-phase windings and three-phase bridge arms of the drive motor, and instead be used as a separate module for buck-boosting. In this case, the buck-boosting function is decoupled from the motor drive, resulting in higher accuracy and faster response speed for buck-boosting regulation, which is suitable for aviation scenarios with higher requirements for charging voltage regulation. Furthermore, motor failure does not affect the charging function, further enhancing system redundancy. This application does not impose any limitations on this aspect.

[0043] In one embodiment, the charging power distribution module includes a capacitor and a plurality of switching relays; wherein the plurality of switching relays are configured to control the connection path between the charging power distribution module and each DC charging interface and each buck-boost module by turning them on or off; the capacitor is configured to provide voltage support and energy buffering when the buck-boost modules are operating. Exemplarily, the charging power distribution module includes the following components: relays (K3-1 to K3-4) and capacitor C3-1.

[0044] Specifically, the charging power distribution module is the core control unit of the system, which is connected to each DC charging interface and each buck-boost module. Its core components are relays (K3-1~K3-4) and capacitor C3-1. By switching the relays on and off, the connection paths are connected / disconnected, and the energy transmission paths between the DC charging interface, buck-boost module and power battery module can be freely reconfigured.

[0045] The capacitors in the charging power distribution module provide voltage support during the operation of the buck-boost module, ensuring voltage stability within the module, buffering energy, and mitigating energy surges between the buck-boost module and the charging interface. This prevents bus voltage drops / overshoots caused by relay switching, buck-boost module start-up and shutdown, and fluctuations in charging pile output. It also buffers energy surges between the charging pile and the battery, preventing damage to relays, switching transistors, and battery modules from high-current switching. Furthermore, it filters out voltage ripple during the buck-boost process, providing a clean and stable charging voltage for the power battery, protecting the battery cells, and extending battery life.

[0046] Furthermore, the charging system for the power battery provided in this embodiment adopts a modular architecture consisting of multiple power battery modules, a DC charging interface, a boost / buck module, and a charging power distribution module, enabling programmable and flexible configuration of the charging path. Specifically, it can achieve multiple charging modes such as single-gun single charging, single-gun dual charging, dual-gun boost charging, and dual-gun independent DC charging. The following will explain each charging mode separately.

[0047] As one possible implementation, when the charging system is configured to perform single-gun single-charge mode, only one DC charging interface is connected to the charging gun; the charging relay in the charging circuit of the power battery module corresponding to the DC charging interface connected to the charging gun is closed, so that the DC charging interface directly charges the power battery module; wherein, the switching unit inside the charging power distribution module remains in the open state, and each buck-boost module is in the non-operating state.

[0048] Specifically, the single-gun single-charger mode involves connecting a single DC charging port to the charging gun, directly charging only the corresponding power battery module. The charging power distribution module and buck-boost module are in standby mode, and the charging path is independent with no interaction. This mode is suitable for applications where a single charging gun is needed to recharge only one power battery module (e.g., another power battery module is fully charged), and the charging pile's output voltage is compatible with the target power battery module. The following explanation will use the example of connecting DC charging port 1 to the charging gun to charge power battery module 1: First, before charging the power battery module 1, the main circuit pre-charging stage begins: pre-charging relay K1-3 and main negative relay K1-1 are closed, and the power battery module 1 completes pre-charging through pre-charging resistor R1-1, raising the voltage of capacitor C1-1 in the power battery module 1 to be equal to or close to the voltage of the battery module 1, avoiding a large current surge caused by subsequent relay closures. Then, the main circuit formal power-on stage begins: after pre-charging, main positive relay K1-2 is closed, and pre-charging relay K1-3 is immediately opened, completing high-voltage power-on of the module 1's main circuit and entering a standby charging state. Then, the charging circuit power-on stage begins: charging positive relay K1-6 and charging negative relay K1-5 are closed, fully connecting DC charging interface 1 with the direct charging path of the power battery module 1, and the charging pile begins charging the battery module 1 through DC charging interface 1.

[0049] Throughout the entire charging process described above, all relays (K2-1~K2-6) of the power battery module 2 remain open, and neither the main circuit nor the charging circuit is energized, achieving complete isolation. The charging power distribution module remains in standby mode: internal relays K3-1~K3-4 remain open and do not participate in energy transfer. The buck-boost module also remains in standby mode: internal switching transistors and inductors do not operate, and there is no voltage adjustment. Finally, the charging execution phase begins. The charging pile establishes communication with the DC charging interface 1 and outputs charging current. The current flow is as follows: DC charging interface 1 → K1-6 → fuse → power battery module 1 → current sensor → K1-5 → DC charging interface 1. Throughout the charging process, the current sensor collects data in real time, achieving precise constant current / constant voltage control until module 1 is fully charged.

[0050] As another possible implementation, when the system is configured to perform a single-gun dual-charging mode, only one DC charging interface is connected to the charging gun. The charging relay in the charging circuit of the first power battery module corresponding to the DC charging interface connected to the charging gun is closed, allowing the DC charging interface connected to the charging gun to charge the first power battery module through the corresponding charging circuit. Furthermore, the charging power distribution module activates the first path, enabling the buck-boost module serving the second power battery module to operate, converting the voltage of the DC charging interface connected to the charging gun into a charging voltage matching the second power battery module before charging it. There is no direct parallel connection between the first and second power battery modules. This structural design, which eliminates direct parallel connection between power battery modules, fundamentally eliminates the energy circulation problem caused by voltage / internal resistance inconsistencies in existing technologies, thereby improving the overall lifespan of the battery system.

[0051] Specifically, the single-gun dual-charger mode connects a single DC charging port to the charging gun, simultaneously charging two battery modules. The first battery module is directly charged, while the second battery module is charged after voltage matching via a charging power distribution module and a dedicated buck-boost module. There is no direct parallel connection between the two battery modules, thus avoiding energy circulation in the circuit. This charging mode is suitable for applications requiring a single charging gun to recharge two battery modules, where the charging pile's output voltage is compatible with the first battery module, and the buck-boost module matches the voltage of the second battery module.

[0052] Furthermore, in the aforementioned single-gun dual-charging mode, one charging gun is connected but needs to charge two power battery modules simultaneously. At this time, the charging pile voltage meets the charging voltage requirements of the first power battery module (i.e., power battery module 1) but not the charging voltage requirements of the second power battery module (i.e., power battery module 2). Therefore, the second power battery module executes a boost charging process to directly charge the first power battery module using DC. For example, if the charging pile voltage is lower than the required voltage of battery module 2 but meets the required voltage of battery module 1, then power battery module 2 executes a boost process (cyclic switching of the switching transistor and charging / discharging of the inductor to raise the voltage). If voltage fine-tuning is required, buck / stabilization is performed as needed to ensure that the output voltage is fully compatible with the required voltage of battery module 2; the first power battery module directly performs DC charging.

[0053] Furthermore, if the voltage of the charging pile does not meet the charging voltage requirements of either battery module, both power battery modules need to simultaneously execute the boost charging process. That is, with one charging gun connected, the boost charging processes of both the first and second power battery modules are initiated simultaneously, so that the output voltage of the charging pile simultaneously meets the charging voltage requirements of both battery module 1 and battery module 2. The following explanation uses the example of the second power battery module executing the boost charging process while the first power battery module directly performs DC charging.

[0054] First, establish a communication connection with the charging interface, and close K1-3 and K1-1 to perform pre-charging. After pre-charging is complete, close K1-2 and then open K1-3 to complete the high-voltage power-on of the main circuit and enter the standby charging state. Then close K1-6 and K1-5 to connect the DC charging path of power battery module 1 and enter the standby charging state.

[0055] Furthermore, the pre-charge relay K2-3 and the main negative relay K2-1 of the power battery module 2 are closed, and the power battery module 2 completes pre-charging; after pre-charging is completed, the main positive relay K2-2 is closed and K2-3 is opened, and the main circuit of the battery module 2 is powered on; and the relays K2-5 and K2-6 in the charging circuit remain open, and the power battery module 2 is not directly connected to any charging interface. The switching units K3-1 and K3-4 of the charging power distribution module are closed, establishing the basic electrical path from DC charging interface 1 to charging power distribution module 2 to step-up / step-down module 2 and then to power battery module 2. Capacitor C3-1 enters a standby charging state. Simultaneously, step-up / step-down module 2 starts working, converting the input voltage of DC charging interface 1 to a charging voltage matching that of power battery module 2. Finally, the switching unit K3-3 of the charging power distribution module is closed, the first path is fully connected, and the charging pile begins to output current, with two paths charging in parallel. Specifically, the DC charging current flow of power battery module 1 is: DC charging interface 1 → K1-6 → fuse → battery module 1 → current sensor → K1-5 → DC charging interface 1. The current flow for boost charging of power battery module 2 is as follows: DC charging interface 1 → K3-3 → K3-4 → boost / buck module 2 → K2-2 → battery module 2 → fuse → current sensor → K2-1 → K3-1 → DC charging interface 1. The current sensor collects the charging current of module 1 and module 2 respectively, and dynamically adjusts the output power of boost / buck module 2 to ensure stable charging current for both modules; until both modules reach the full charge threshold, the relays are disconnected in sequence to stop charging.

[0056] In the above-mentioned single-gun dual-charging mode, K2-5 and K2-6 are always disconnected, and there is no direct electrical connection between power battery module 1 and power battery module 2. The positive terminals of the two battery modules are not directly connected in parallel through wires or relays, which can completely eliminate the risk of circulating current. This avoids circulating current flowing through the battery internal resistance and connection lines, generating Joule heat, causing the battery temperature to rise, and accelerating battery aging.

[0057] The current flow in the single-gun dual-charging mode based on the boost charging process performed by the second power battery module can be found in the following reference: Figure 3 The diagram shows the current flow structure in the single-gun dual-charging mode. The red arrows indicate the main charging current flow in this mode, representing the forward charging current and the path through which the charging gun delivers energy to the two battery modules. The black arrows represent the current flow in the current return path or the reverse energy transfer path, thus completing the closed loop of the charging circuit and realizing the buck / energy feedback function of the boost / buck module. Together, these elements constitute the complete energy transfer logic of the system, ensuring that energy is safely and efficiently distributed to each power battery module under different charging modes.

[0058] As another possible implementation, when the system is configured to perform dual-gun boost charging mode, the two DC charging interfaces are respectively connected to the charging guns; the charging power distribution module connects the second and third paths, so that the first and second DC charging interfaces connected to the charging guns charge the first and second power battery modules respectively; when the output voltage of the charging pile is lower than the charging voltage required by the power battery module, the buck-boost module corresponding to the power battery module is configured to perform a boost operation, increasing the output voltage of the charging pile to charge the corresponding power battery module.

[0059] The dual-gun boost charging mode connects both DC charging ports to the charging guns. The charging power distribution module activates the second and third paths, and the energy from both charging piles is combined to charge both modules. If the output voltage of the charging pile is lower than the charging requirements of the power battery module, the corresponding buck-boost module performs a boost operation to achieve voltage matching before charging. This mode is suitable for dual charging guns but where the charging piles are of low voltage specifications, and the output voltage is lower than the charging requirements of aviation high-voltage platform batteries, requiring simultaneous boost charging of both power battery modules.

[0060] Specifically, firstly, connect charging gun 1 to DC charging interface 1 and charging gun 2 to DC charging interface 2; establish communication between power battery module 1 and charging pile 1, and between power battery module 2 and charging pile 2 respectively, and interactively confirm the output parameters of the charging pile (all lower than the module charging voltage). The system then determines to start the boost charging mode.

[0061] For power battery module 1, K1-3 and K1-1 are closed for pre-charging. After pre-charging is complete, K1-2 is closed and K1-3 is opened to power on the main circuit. For power battery module 2, K2-3 and K2-1 are closed for pre-charging. After pre-charging is complete, K2-2 is closed and K2-3 is opened to power on the main circuit. In the above charging mode, the charging circuit relays of the two power battery modules (K1-5 / K1-6 and K2-5 / K2-6 are all kept open) are not directly charged with the charging interface.

[0062] Furthermore, the control charging power distribution module connects the second and third paths, closes all internal switching units K3-1, K3-2, K3-3, and K3-4, and completes the second path (DC charging interface 1 → charging power distribution module → buck-boost module 1 → power battery module 1) and the third path (DC charging interface 2 → charging power distribution module → buck-boost module 2 → power battery module 2). At the same time, it realizes the convergence of energy from the two charging piles to the power distribution module, and capacitor C3-1 provides voltage support.

[0063] At this time, the buck-boost modules 1 and 2 simultaneously enter the working state and execute the boost process. Specifically, the upper bridge arm (Q1-1 / Q1-3 / Q1-5) and lower bridge arm (Q1-2 / Q1-4 / Q1-6) switches of the buck-boost module 1 are periodically turned on / off, causing the inductors L1-1 to L1-3 to charge and discharge repeatedly, raising the low voltage of the charging pile 1 to the charging voltage matching that of the module 1; the buck-boost module 2 operates with the same logic, raising the low voltage of the charging pile 2 to the charging voltage matching that of the module 2; capacitors C1-1 and C2-1 filter and regulate the boosted voltage to ensure a stable and ripple-free output voltage.

[0064] The dual charging piles output current synchronously, which is then converged by the power distribution module and boosted through the second and third paths to charge both modules. The core current flow directions are as follows: Power battery module 1, charging pile 1 → DC charging interface 1 → K3-3 → buck-boost module 1 → K1-2 → battery module 1 → K1-1 → K3-1 → DC charging interface 1; Power battery module 2: Charging pile 2 → DC charging interface 2 → K3-2 → buck-boost module 2 → K2-2 → battery module 2 → K2-1 → K3-4 → DC charging interface 2.

[0065] The system monitors the output voltage / current of the two charging piles and the terminal voltage of the two modules in real time. By adjusting the duty cycle of the switching transistors of the step-up and step-down modules, it precisely controls the step-up voltage and charging current. When both modules are fully charged, the power distribution module switching unit is disconnected in sequence, the step-up and step-down modules stop working, and the main circuit of the two modules is de-energized, thus ending the charging process.

[0066] As another possible implementation, when the system is configured in dual-gun independent DC charging mode, the two DC charging interfaces are connected to the charging guns respectively; when the output voltage of the charging pile meets the charging voltage requirements of the corresponding power battery module, the power battery module closes the charging positive relay and charging negative relay in its charging circuit, so that each DC charging interface directly charges each power battery module; the switching unit inside the charging power distribution module remains in the open state, so that the charging paths of the two DC charging interfaces are independent of each other.

[0067] The dual-gun independent DC charging mode connects two DC charging ports to the charging guns, ensuring the charging station's output voltage meets the charging requirements of the corresponding power battery module. Each module independently closes its own charging circuit relay, enabling direct charging with independent charging paths. The charging power distribution module and buck-boost module are in standby mode. This mode is suitable for applications requiring dual charging guns, high-voltage charging stations with output voltages fully compatible with aviation power battery modules, and maximizing energy replenishment efficiency through independent direct charging of the dual modules.

[0068] Specifically, firstly, charging gun 1 is connected to DC charging interface 1, and charging gun 2 is connected to DC charging interface 2. Power battery module 1 establishes communication with charging pile 1, and power battery module 2 establishes communication with charging pile 2, confirming that the output voltage / current of the charging pile fully matches the charging requirements of the corresponding module. The system then determines to start the independent DC charging mode. Then, the two modules synchronously execute the main circuit pre-charging, power-on, and charging circuit power-on operations, operating independently without interference.

[0069] For power battery module 1, K1-3 and K1-1 are closed for pre-charging. After pre-charging is complete, K1-2 is closed and K1-3 is opened (main circuit is powered on). Then, K1-5 and K1-6 are closed (charging circuit is powered on), completing the preparation for direct charging. For power battery module 2, K2-3 and K2-1 are closed for pre-charging. After pre-charging is complete, K2-2 is closed and K2-3 is opened (main circuit is powered on). Then, K2-5 and K2-6 are closed (charging circuit is powered on), completing the preparation for direct charging.

[0070] The charging power distribution module and the buck-boost module are in standby mode. In the charging power distribution module, all internal switching units (K3-1~K3-4) remain disconnected, completely isolating the charging paths of the two DC charging interfaces and ensuring no interaction between the two charging paths. In the buck-boost module 1 / 2, the internal switching transistors, inductors, and capacitors are all inactive and do not perform any voltage regulation. Both charging stations output current synchronously, directly charging their respective modules. The two current flows are independent of each other, with no energy convergence.

[0071] The current flow of the power battery module 1 is as follows: charging pile 1 → DC charging interface 1 → K1-6 → fuse → power battery module 1 → current sensor → K1-5 → DC charging interface 1; The current flow of power battery module 2 is as follows: charging pile 2 → DC charging interface 2 → K2-6 → fuse → module 2 → current sensor → K2-5 → DC charging interface 2. The current sensors of both modules collect their own charging data, enabling independent constant current / constant voltage control (if module 1 is fully charged first, it stops charging independently without affecting module 2). When both modules are fully charged, their respective charging circuits and main circuit relays are disconnected, the charging pile stops outputting power, and charging ends.

[0072] The above explanation only uses single-gun single-charge, single-gun dual-charge, dual-gun boost, and dual-gun independent direct charging modes as examples. The charging system provided in this application embodiment can also be adapted to the dual-gun buck charging mode. This mode is specifically suitable for application scenarios where the output voltage of the two charging piles is higher than the adaptation voltage of the aviation power battery module (such as a high-voltage charging pile adapting to a low-voltage platform battery). By connecting the dual interface paths through the charging power distribution module, the two buck-boost modules work synchronously in buck mode to reduce the excessively high voltage of the charging pile to the module adaptation value, thereby achieving safe adaptation charging of the high-voltage pile and avoiding overvoltage damage to the battery.

[0073] Furthermore, it can also adapt to a single-gun boost charging mode, suitable for applications where a single charging gun is connected and the charging pile's output voltage is lower than the adapter voltage of a single power battery module. Additionally, it can adapt to a dual-gun hybrid charging mode, suitable for applications where two charging guns are connected, but one charging pile has a compatible voltage while the other has a lower voltage. In this mode, the power battery module connected to the charging pile with the compatible current interface performs independent dual-gun DC charging, while the power battery module connected to the charging pile with the lower voltage performs boost charging.

[0074] All of these modes rely on the system's modular architecture, the bidirectional voltage regulation capability of the buck-boost module, and the path reconfiguration characteristics of the power distribution module. They do not alter the core hardware design and can be achieved simply through relay on / off combinations and buck-boost module operating state switching, thus adapting to the diverse and highly adaptable charging needs of aviation power batteries. This application does not limit the specific charging modes of the charging system in its embodiments.

[0075] Figure 4 This is a circuit diagram of another power battery system provided in an embodiment of this application. Figure 4 It includes power battery module 1 and power battery module 2, buck-boost modules 1-1, 2-1 and buck-boost modules 1-2, 2-2 and charging power distribution module. Figure 4 The circuit diagram shown is the same as Figure 3 The only difference in the circuit diagrams shown is that Figure 4 Each power battery module in the system is connected in parallel with two buck-boost modules.

[0076] In one embodiment, at least one power battery module is connected in parallel to multiple buck-boost modules. The charging power distribution module includes multiple switching relays configured to connect to each buck-boost module respectively and to disconnect the electrical connection between the charging power distribution module and the buck-boost modules in non-boost charging conditions.

[0077] Specifically, each power battery module is independently connected in parallel with at least two buck-boost modules (e.g., module 1 is equipped with buck-boost 1-1 / 1-2, and module 2 is equipped with buck-boost 2-1 / 2-2). Each buck-boost module is connected to the charging power distribution module through a dedicated switch relay, forming a redundant configuration of one power battery module for multiple buck-boost modules.

[0078] The charging power distribution module connects / disconnects the buck-boost module and the battery module as needed via internal switching relays. During non-boost charging conditions (such as buck, direct charging, and sleep mode), the connection is directly disconnected to avoid unnecessary energy consumption or circuit interference. During boost charging conditions, the path between the target buck-boost module and the battery module is connected as needed. Each parallel buck-boost module has an independent voltage regulation channel, allowing it to operate independently, in parallel, or as redundant backups without interference, and is decoupled from the main circuit / charging circuit of the power battery module.

[0079] The parallel connection of multiple buck-boost modules in the above embodiments allows for superimposed power output, significantly increasing the boost / buck power level of a single battery module. This adapts to the high-power, high-current rapid power replenishment needs in the aviation field (such as large eVTOLs), overcoming the bottleneck of insufficient power from a single buck-boost module. In the event of a single buck-boost module failure, the system can switch to other parallel modules to continue operation, or utilize the remaining modules to maintain basic charging functionality, preventing charging interruptions due to buck-boost module failure and meeting the high reliability and single-point-of-failure safety requirements of aviation equipment. The system supports single buck-boost module operation (low-power scenarios), multi-module parallel operation (high-power scenarios), and redundancy backup (failure scenarios), and can dynamically switch according to charging needs, significantly improving the system's scenario adaptability and flexibility.

[0080] The charging control method corresponding to the charging system provided in this application acquires charging scenario information, which includes at least the number of DC charging interfaces connected to the charging gun; determines the target charging mode based on the charging scenario information; controls the switching unit inside the charging power distribution module to turn on or off based on the target charging mode to construct an energy transmission link corresponding to the target charging mode; and controls the working state of each buck-boost module to adjust the voltage and current in the energy transmission path to charge each power battery module. It supports multiple modes such as single-gun single charging, dual-gun independent charging, dual-gun boost charging, and dual-gun DC charging. Voltage matching and power distribution are achieved through the buck-boost module, avoiding charging bottlenecks caused by charging pile voltage limitations; thus, it can adapt to different charging pile configurations and usage scenarios. Furthermore, the aforementioned buck-boost module supports boost charging, enabling high-voltage platform power battery systems to charge normally on low-voltage output charging piles, significantly improving charging compatibility and practicality.

[0081] Figure 5 A flowchart illustrating an embodiment of a charging control method for a power battery charging system provided in this application includes the following steps: Step 501: Obtain charging scenario information, which includes at least the number of DC charging interfaces connected to the charging gun.

[0082] Charging scenario information can refer to a set of core parameters used to describe the current charging hardware connection and environment. It should include at least the number of DC charging interfaces connected to the charging gun, and may also include: charging pile output voltage / current, remaining power of the power battery module, battery module voltage, and health status of the buck-boost module.

[0083] The number of DC charging interfaces can refer to the number of DC charging interfaces that are currently physically connected to the charging gun and have established communication. For example, the value can be 1 or 2, which is the core input for determining the charging mode.

[0084] In one embodiment, each DC charging port is equipped with a connection confirmation signal (such as a CC2 signal). When a charging gun is inserted, the detection circuit of the corresponding port sends a connection status signal to the battery management system (BMS) or vehicle controller. After the charging pile establishes communication with the vehicle, the BMS can obtain the presence information of the charging pile. The controller (such as the BMS or a dedicated charging management unit) monitors these signals in real time to determine the number of currently connected charging guns (0, 1, or 2).

[0085] For example, suppose only DC charging port 1 is connected to the charging gun, and DC charging port 2 is not connected. The charging scenario information is "single-gun connection". If both ports are connected to the charging gun, the charging scenario information is "dual-gun connection".

[0086] It is evident that the system can automatically sense changes in the external environment and can automatically monitor and identify real-time charging scenario information such as single-gun insertion and dual-gun insertion without human intervention.

[0087] Step 502: Determine the target charging mode based on the charging scenario information.

[0088] The target charging mode can refer to the optimal charging strategy selected by the system from a preset mode library based on charging scenario information. For example, it includes at least: single-gun single-charge mode (1 DC charging port, single module charging), single-gun dual-charge mode (1 DC charging port, dual module charging), dual-gun independent DC charging mode (2 DC charging ports, voltage matching, direct charging), dual-gun boost charging mode (2 DC charging ports, boost charging when voltage is insufficient), and other modes (single-gun boost, dual-gun hybrid charging, etc.).

[0089] In one embodiment, the controller automatically determines the corresponding charging mode based on the number of connected charging guns and other factors (such as battery module voltage, charging pile output voltage capability, user needs, etc.). Specifically, if only one gun is connected, it may select a single-gun dual-charging mode (if two batteries need to be charged simultaneously) or a single-gun single-charging mode (only one battery needs to be charged). This can be determined by user selection or system default strategy. If two guns are connected, it further determines whether the charging pile output voltage meets the battery requirements: if the charging pile output voltage is higher than the minimum voltage required by the battery, it can select a dual-gun direct DC charging mode or a dual-gun independent charging mode. If the charging pile output voltage is lower than the voltage required by the battery (e.g., a high-voltage platform battery), it selects a dual-gun boost charging mode.

[0090] For example, assuming the user only plugs in one charging gun and both battery modules need charging, the controller selects the single-gun dual-charging mode. If both guns are connected and the charging pile's output voltage is higher than the battery voltage, the dual-gun direct DC charging mode is selected. If both guns are connected, but the charging pile's output voltage is lower than the battery voltage, the dual-gun boost charging mode is selected.

[0091] Step 503: Based on the target charging mode, control the switching unit inside the charging power distribution module to turn on or off, so as to build an energy transmission link corresponding to the target charging mode, and control the working state of each buck-boost module to adjust the voltage and current in the energy transmission path to charge each power battery module.

[0092] The switching unit can refer to the relays (such as K3-1, K3-2, K3-3, K3-4) inside the charging power distribution module, which are used to connect or disconnect different energy transmission paths.

[0093] The operating state of a buck-boost module can refer to the operating mode of each module (e.g., module 1, module 2), including: not operating, all switching transistors are off, and the module is in an open state; boost mode, where the input voltage is increased and then output by controlling the switching transistors; and buck mode, where the input voltage is decreased and then output. The aforementioned energy transmission link can refer to the specific path of current flow from the charging interface to the battery module.

[0094] In one embodiment, the target charging mode includes a single-gun single-charge mode; the working state of the switching unit inside the charging power distribution module and each buck-boost module is controlled based on the target charging mode, including: controlling the power battery module corresponding to the DC charging interface connected to the charging gun to close the charging relay in its charging circuit, so that the DC charging interface directly charges the power battery module; wherein, the switching unit inside the charging power distribution module remains in the open state, and each buck-boost module is in the non-working state.

[0095] In one embodiment, the target charging mode includes a single-gun dual-charging mode; the operation of the switching unit and each buck-boost module within the charging power distribution module is controlled based on the target charging mode, including: controlling the first power battery module corresponding to the DC charging interface connected to the charging gun to close the charging positive relay in its charging circuit, so that the DC charging interface connected to the charging gun directly charges the first power battery module through the corresponding charging circuit; controlling the charging power distribution module to conduct the first path, so that the buck-boost module serving the second power battery module works, so as to convert the voltage of the DC charging interface connected to the charging gun into a charging voltage that matches the second power battery module and then charge the second power battery module; wherein, there is no direct parallel connection between the first power battery module and the second power battery module.

[0096] In one embodiment, the target charging mode includes a dual-gun boost charging mode; the operation of the switching unit inside the charging power distribution module and each boost / buck module is controlled based on the target charging mode, including: controlling the charging power distribution module to conduct the second path and the third path, so that the first DC charging interface and the second DC charging interface connected to the charging gun charge the first power battery module and the second power battery module respectively; and, when the output voltage of the charging pile is lower than the charging voltage required by the power battery module, controlling the boost / buck module corresponding to the power battery module to perform a boost operation, so as to increase the output voltage of the charging pile to charge the power battery module.

[0097] In one embodiment, the target charging mode includes a dual-gun independent DC charging mode; the working state of the switching unit inside the charging power distribution module and each buck-boost module is controlled based on the target charging mode, including: when the output voltage of the charging pile meets the charging voltage requirement of the corresponding power battery module, controlling the power battery module to close the charging positive relay and charging negative relay in its charging circuit, so that each DC charging interface directly charges each power battery module; wherein, the switching unit inside the charging power distribution module remains in the open state, so that the charging paths of the two DC charging interfaces are independent of each other.

[0098] For details on the implementation methods of each of the above target charging modes, please refer to the relevant description of the power battery charging system mentioned above, which will not be repeated here.

[0099] As can be seen, the system can automatically perform logical judgments based on the current charging scenario information and dynamically determine the optimal mode. It can also monitor changes in various parameters during the charging process in real time, such as battery voltage increases or charging pile output fluctuations, and seamlessly switch modes when necessary. For example, when the battery voltage drops to a range directly supported by the charging pile, it switches from boost mode to direct charging mode. Furthermore, if a boost / buck module fails, the system can automatically switch to single-gun single-charger mode or continue charging via an alternative path.

[0100] The above embodiments support intelligent switching between multiple working modes. By acquiring charging scenario information (including at least the number of DC charging interfaces connected to the charging gun), the system can automatically identify the current hardware connection status and select the optimal target charging mode from a preset mode library. It is also compatible with single-gun / dual-gun charging environments. Whether only one charging gun is available or both charging guns are connected simultaneously, the system can find a suitable charging strategy, avoiding the limitations of a single gun not being able to charge two devices simultaneously or dual guns having to operate independently. When the charging pile's output voltage is lower than the battery's requirements, it can automatically switch to boost charging mode, enabling high-voltage platform batteries to be charged on ordinary charging piles, greatly improving charging compatibility.

[0101] Figure 6 A structural block diagram of a charging control device for a charging system of a power battery as described in any one of the first aspects, provided in an embodiment of this application, the device comprising: The charging scenario information acquisition module 61 is used to acquire charging scenario information, which includes at least the number of DC charging interfaces connected to the charging gun. The target charging mode determination module 62 is used to determine the target charging mode based on the charging scenario information. The charging mode activation module 63 is used to control the switching unit inside the charging power distribution module to be turned on or off based on the target charging mode, so as to construct an energy transmission link corresponding to the target charging mode, and to control the working state of each of the buck-boost modules to adjust the voltage and current in the energy transmission path to charge each of the power battery modules.

[0102] In one possible implementation, the target charging mode includes a single-gun single-charger mode; the charging mode activation module is specifically used for: The power battery module corresponding to the DC charging interface connected to the charging gun closes the charging relay in its charging circuit, so that the DC charging interface directly charges the power battery module. The switching unit inside the charging power distribution module remains in the off state, and each of the buck-boost modules is in a non-operating state.

[0103] In one possible implementation, the target charging mode includes a single-gun dual-charging mode; the charging mode activation module is specifically used for: The first power battery module corresponding to the DC charging interface connected to the charging gun is controlled to close the charging relay in its charging circuit, so that the DC charging interface connected to the charging gun can directly charge the first power battery module through the corresponding charging circuit. The charging power distribution module is controlled to conduct the first path, so that the buck-boost module serving the second power battery module can work, so as to convert the voltage of the DC charging interface connected to the charging gun into a charging voltage that matches the second power battery module and then charge the second power battery module. There is no direct parallel connection between the first power battery module and the second power battery module.

[0104] In one possible implementation, the target charging mode includes a dual-gun boost charging mode; the charging mode activation module is specifically configured to include: The charging power distribution module is controlled to turn on the second and third paths, so that the first DC charging interface and the second DC charging interface connected to the charging gun charge the first power battery module and the second power battery module respectively. Furthermore, when the output voltage of the charging pile is lower than the charging voltage required by the power battery module, the buck-boost module corresponding to the power battery module is controlled to perform a boost operation to increase the output voltage of the charging pile and charge the power battery module.

[0105] In one possible implementation, the target charging mode includes a dual-gun independent DC charging mode; the charging mode activation module is specifically used for: When the output voltage of the charging pile meets the charging voltage requirements of the corresponding power battery module, the power battery module is controlled to close the charging positive relay and charging negative relay in its charging circuit, so that each DC charging interface directly charges each power battery module. The switching unit inside the charging power distribution module remains in the off state, so that the charging paths of the two DC charging interfaces are independent of each other.

[0106] Fourthly, this application provides an electronic device, including: a processor and a memory, wherein the processor is configured to execute a charging control program for a power battery charging system stored in the memory, so as to implement the charging control method for the power battery charging system as described in any one of the second aspects.

[0107] like Figure 7 As shown in the figure, this application provides an electronic device, including a processor 111, a communication interface 112, a memory 113, and a communication bus 114, wherein the processor 111, the communication interface 112, and the memory 113 communicate with each other through the communication bus 114. Memory 113 is used to store computer programs; In one embodiment of this application, the processor 111, when executing a program stored in the memory 113, implements the charging control method of the power battery charging system provided in any of the foregoing method embodiments, including: Obtain charging scenario information, which includes at least the number of DC charging interfaces connected to the charging gun; Based on the charging scenario information, determine the target charging mode; Based on the target charging mode, the switching unit inside the charging power distribution module is controlled to be turned on or off to construct an energy transmission link corresponding to the target charging mode, and the working state of each of the buck-boost modules is controlled to adjust the voltage and current in the energy transmission path to charge each of the power battery modules.

[0108] This application also provides a computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements the steps of the charging control method for the charging system of the power battery as provided in any of the foregoing method embodiments.

[0109] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs.

[0110] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented using software plus a general-purpose hardware platform, or of course, using hardware. Based on this understanding, the above technical solutions, in essence or the parts that contribute to the related technology, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

[0111] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “described” as used herein may also mean including the plural forms. The terms “comprising,” “including,” “containing,” and “having” are inclusive and therefore indicate the presence of the stated features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not construed as requiring them to be performed in a particular order described or illustrated unless the order of performance is explicitly indicated. It should also be understood that additional or alternative steps may be used.

[0112] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A charging system for a power battery, characterized in that, The system includes: At least two power battery modules, each of which has a charging circuit; At least two DC charging interfaces, each of which is connected to a charging circuit of one of the power battery modules; Multiple buck-boost modules are provided, with each power battery module connected to at least one buck-boost module. In addition, a charging power distribution module is connected to each of the DC charging interfaces and each of the buck-boost modules, respectively; The charging power distribution module is configured to connect or disconnect each connection path through its internal switching unit to reconstruct the energy transmission path between the DC charging interface, the buck-boost module and the power battery module.

2. The system according to claim 1, characterized in that, The charging power distribution module includes a capacitor and multiple switching relays; The plurality of switching relays are configured to control the connection path between the charging power distribution module and each of the DC charging interfaces and each of the buck-boost modules by turning them on or off. The capacitor is configured to provide voltage support and energy buffering when the buck-boost module is operating, so as to provide a stable voltage reference for the charging power distribution module.

3. The system according to claim 1, characterized in that, The buck-boost module reuses the three-phase windings and three-phase bridge arm circuit of the drive motor to achieve the buck-boost function; The three-phase windings of the drive motor are used as inductors in the buck-boost module. The three-phase bridge arm circuit of the drive motor is used as the switching transistor architecture in the buck-boost module.

4. The system according to claim 1, characterized in that, At least one of the power battery modules is connected in parallel to multiple of the buck-boost modules.

5. The system according to claim 4, characterized in that, The charging power distribution module includes multiple switching relays, which are configured to connect to each of the buck-boost modules respectively, and disconnect the electrical connection between the charging power distribution module and the buck-boost modules in the case of non-boost charging.

6. The system according to claim 1, characterized in that, The system is configured to operate in single-gun, single-charger mode; wherein: Only one of the aforementioned DC charging interfaces is connected to the charging gun; Close the charging relay in the charging circuit of the power battery module corresponding to the DC charging interface connected to the charging gun, so that the DC charging interface directly charges the power battery module; The switching unit inside the charging power distribution module remains in the off state, and each of the buck-boost modules is in a non-operating state.

7. The system according to claim 1, characterized in that, The system is configured to perform a single-gun dual-charging mode; wherein: Only one of the aforementioned DC charging interfaces is connected to the charging gun; Close the charging relay in the charging circuit of the first power battery module corresponding to the DC charging interface connected to the charging gun, so that the DC charging interface connected to the charging gun charges the first power battery module through the corresponding charging circuit. In addition, the charging power distribution module turns on the first path to enable the buck-boost module serving the second power battery module to work, so as to convert the voltage of the DC charging interface connected to the charging gun into a charging voltage that matches the second power battery module and then charge the second power battery module. There is no direct parallel connection between the first power battery module and the second power battery module.

8. The system according to claim 1, characterized in that, The system is configured to perform a dual-gun boost charging mode, wherein: Connect the two DC charging ports to the charging gun respectively; The charging power distribution module connects the second path and the third path, so that the first DC charging interface and the second DC charging interface connected to the charging gun charge the first power battery module and the second power battery module respectively. When the output voltage of the charging pile is lower than the charging voltage required by the power battery module, the buck-boost module corresponding to the power battery module is configured to perform a boost operation to increase the output voltage of the charging pile and charge the corresponding power battery module.

9. The system according to claim 1, characterized in that, The system is configured for dual-gun independent DC charging mode, wherein: Connect the two DC charging ports to the charging gun respectively; When the output voltage of the charging pile meets the charging voltage requirements of the corresponding power battery module, the power battery module closes the charging positive relay and charging negative relay in its charging circuit, so that each DC charging interface directly charges each power battery module. The switching unit inside the charging power distribution module remains in the off state, so that the charging paths of the two DC charging interfaces are independent of each other.

10. A charging control method for a charging system of a power battery according to any one of claims 1-9, characterized in that, The method includes: Obtain charging scenario information, which includes at least the number of DC charging interfaces connected to the charging gun; Based on the charging scenario information, determine the target charging mode; Based on the target charging mode, the switching unit inside the charging power distribution module is controlled to be turned on or off to construct an energy transmission link corresponding to the target charging mode, and the working state of each of the buck-boost modules is controlled to adjust the voltage and current in the energy transmission path to charge each of the power battery modules.

11. The charging control method according to claim 10, characterized in that, The target charging mode includes a single-gun single-charger mode. Controlling the switching unit inside the charging power distribution module and the operating state of each of the buck-boost modules based on the target charging mode includes: The power battery module corresponding to the DC charging interface connected to the charging gun closes the charging relay in its charging circuit, so that the DC charging interface directly charges the power battery module. The switching unit inside the charging power distribution module remains in the off state, and each of the buck-boost modules is in a non-operating state.

12. The charging control method according to claim 10, characterized in that, The target charging mode includes a single-gun dual-charging mode; based on the target charging mode, the operating states of the switching units inside the charging power distribution module and each of the buck-boost modules are controlled, including: The first power battery module corresponding to the DC charging interface connected to the charging gun is controlled to close the charging positive relay in its charging circuit, so that the DC charging interface connected to the charging gun can directly charge the first power battery module through the corresponding charging circuit. The charging power distribution module is controlled to conduct the first path, so that the buck-boost module serving the second power battery module can work, so as to convert the voltage of the DC charging interface connected to the charging gun into a charging voltage that matches the second power battery module and then charge the second power battery module. There is no direct parallel connection between the first power battery module and the second power battery module.

13. The charging control method according to claim 10, characterized in that, The target charging mode includes a dual-gun boost charging mode; based on the target charging mode, the switching unit inside the charging power distribution module and the operating state of each of the boost and buck modules are controlled, including: The charging power distribution module is controlled to turn on the second and third paths, so that the first DC charging interface and the second DC charging interface connected to the charging gun charge the first power battery module and the second power battery module respectively. Furthermore, when the output voltage of the charging pile is lower than the charging voltage required by the power battery module, the buck-boost module corresponding to the power battery module is controlled to perform a boost operation to increase the output voltage of the charging pile and charge the power battery module.

14. The charging control method according to claim 10, characterized in that, The target charging mode includes a dual-gun independent DC charging mode; based on the target charging mode, the operating states of the switching units inside the charging power distribution module and each of the buck-boost modules are controlled, including: When the output voltage of the charging pile meets the charging voltage requirements of the corresponding power battery module, the power battery module is controlled to close the charging positive relay and charging negative relay in its charging circuit, so that each DC charging interface directly charges each power battery module. The switching unit inside the charging power distribution module remains in the off state, so that the charging paths of the two DC charging interfaces are independent of each other.

15. A charging control device for a charging system of a power battery according to any one of claims 1-9, characterized in that, The device includes: A charging scenario information acquisition module is used to acquire charging scenario information, which includes at least the number of DC charging interfaces connected to the charging gun. The target charging mode determination module is used to determine the target charging mode based on the charging scenario information. The charging mode activation module is used to control the switching unit inside the charging power distribution module to be turned on or off based on the target charging mode, so as to construct an energy transmission link corresponding to the target charging mode, and to control the working state of each of the buck-boost modules to adjust the voltage and current in the energy transmission path to charge each of the power battery modules.

16. An electronic device, characterized in that, include: A processor and a memory, the processor being configured to execute a charging control program for a power battery charging system stored in the memory, to implement the charging control method for the power battery charging system as described in claims 10-14.

17. A storage medium, characterized in that, The storage medium stores one or more programs, which can be executed by one or more processors to implement the charging control method of the power battery charging system as described in claims 10-14.

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